1c1d7c514SDavid Sterba // SPDX-License-Identifier: GPL-2.0 2f46b5a66SChristoph Hellwig /* 3f46b5a66SChristoph Hellwig * Copyright (C) 2007 Oracle. All rights reserved. 4f46b5a66SChristoph Hellwig */ 5f46b5a66SChristoph Hellwig 6f46b5a66SChristoph Hellwig #include <linux/kernel.h> 7f46b5a66SChristoph Hellwig #include <linux/bio.h> 8f46b5a66SChristoph Hellwig #include <linux/file.h> 9f46b5a66SChristoph Hellwig #include <linux/fs.h> 10cb8e7090SChristoph Hellwig #include <linux/fsnotify.h> 11f46b5a66SChristoph Hellwig #include <linux/pagemap.h> 12f46b5a66SChristoph Hellwig #include <linux/highmem.h> 13f46b5a66SChristoph Hellwig #include <linux/time.h> 14f46b5a66SChristoph Hellwig #include <linux/string.h> 15f46b5a66SChristoph Hellwig #include <linux/backing-dev.h> 16cb8e7090SChristoph Hellwig #include <linux/mount.h> 17cb8e7090SChristoph Hellwig #include <linux/namei.h> 18f46b5a66SChristoph Hellwig #include <linux/writeback.h> 19f46b5a66SChristoph Hellwig #include <linux/compat.h> 20cb8e7090SChristoph Hellwig #include <linux/security.h> 21f46b5a66SChristoph Hellwig #include <linux/xattr.h> 22f54de068SDavid Sterba #include <linux/mm.h> 235a0e3ad6STejun Heo #include <linux/slab.h> 24f7039b1dSLi Dongyang #include <linux/blkdev.h> 258ea05e3aSAlexander Block #include <linux/uuid.h> 2655e301fdSFilipe Brandenburger #include <linux/btrfs.h> 27416161dbSMark Fasheh #include <linux/uaccess.h> 28ae5e165dSJeff Layton #include <linux/iversion.h> 2997fc2977SMiklos Szeredi #include <linux/fileattr.h> 3014605409SBoris Burkov #include <linux/fsverity.h> 311881fba8SOmar Sandoval #include <linux/sched/xacct.h> 32f46b5a66SChristoph Hellwig #include "ctree.h" 33f46b5a66SChristoph Hellwig #include "disk-io.h" 34949964c9SMarcos Paulo de Souza #include "export.h" 35f46b5a66SChristoph Hellwig #include "transaction.h" 36f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 37f46b5a66SChristoph Hellwig #include "print-tree.h" 38f46b5a66SChristoph Hellwig #include "volumes.h" 39925baeddSChris Mason #include "locking.h" 40d7728c96SJan Schmidt #include "backref.h" 41606686eeSJosef Bacik #include "rcu-string.h" 4231db9f7cSAlexander Block #include "send.h" 433f6bcfbdSStefan Behrens #include "dev-replace.h" 4463541927SFilipe David Borba Manana #include "props.h" 453b02a68aSJeff Mahoney #include "sysfs.h" 46fcebe456SJosef Bacik #include "qgroup.h" 471ec9a1aeSFilipe Manana #include "tree-log.h" 48ebb8765bSAnand Jain #include "compression.h" 498719aaaeSJosef Bacik #include "space-info.h" 5086736342SJosef Bacik #include "delalloc-space.h" 51aac0023cSJosef Bacik #include "block-group.h" 5222b398eeSQu Wenruo #include "subpage.h" 53f46b5a66SChristoph Hellwig 54abccd00fSHugo Mills #ifdef CONFIG_64BIT 55abccd00fSHugo Mills /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI 56abccd00fSHugo Mills * structures are incorrect, as the timespec structure from userspace 57abccd00fSHugo Mills * is 4 bytes too small. We define these alternatives here to teach 58abccd00fSHugo Mills * the kernel about the 32-bit struct packing. 59abccd00fSHugo Mills */ 60abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 { 61abccd00fSHugo Mills __u64 sec; 62abccd00fSHugo Mills __u32 nsec; 63abccd00fSHugo Mills } __attribute__ ((__packed__)); 64abccd00fSHugo Mills 65abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 { 66abccd00fSHugo Mills char uuid[BTRFS_UUID_SIZE]; /* in */ 67abccd00fSHugo Mills __u64 stransid; /* in */ 68abccd00fSHugo Mills __u64 rtransid; /* out */ 69abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 stime; /* in */ 70abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 rtime; /* out */ 71abccd00fSHugo Mills __u64 flags; /* in */ 72abccd00fSHugo Mills __u64 reserved[16]; /* in */ 73abccd00fSHugo Mills } __attribute__ ((__packed__)); 74abccd00fSHugo Mills 75abccd00fSHugo Mills #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ 76abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32) 77abccd00fSHugo Mills #endif 78abccd00fSHugo Mills 792351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 802351f431SJosef Bacik struct btrfs_ioctl_send_args_32 { 812351f431SJosef Bacik __s64 send_fd; /* in */ 822351f431SJosef Bacik __u64 clone_sources_count; /* in */ 832351f431SJosef Bacik compat_uptr_t clone_sources; /* in */ 842351f431SJosef Bacik __u64 parent_root; /* in */ 852351f431SJosef Bacik __u64 flags; /* in */ 86e77fbf99SDavid Sterba __u32 version; /* in */ 87e77fbf99SDavid Sterba __u8 reserved[28]; /* in */ 882351f431SJosef Bacik } __attribute__ ((__packed__)); 892351f431SJosef Bacik 902351f431SJosef Bacik #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \ 912351f431SJosef Bacik struct btrfs_ioctl_send_args_32) 921881fba8SOmar Sandoval 931881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 { 941881fba8SOmar Sandoval compat_uptr_t iov; 951881fba8SOmar Sandoval compat_ulong_t iovcnt; 961881fba8SOmar Sandoval __s64 offset; 971881fba8SOmar Sandoval __u64 flags; 981881fba8SOmar Sandoval __u64 len; 991881fba8SOmar Sandoval __u64 unencoded_len; 1001881fba8SOmar Sandoval __u64 unencoded_offset; 1011881fba8SOmar Sandoval __u32 compression; 1021881fba8SOmar Sandoval __u32 encryption; 1031881fba8SOmar Sandoval __u8 reserved[64]; 1041881fba8SOmar Sandoval }; 1051881fba8SOmar Sandoval 1061881fba8SOmar Sandoval #define BTRFS_IOC_ENCODED_READ_32 _IOR(BTRFS_IOCTL_MAGIC, 64, \ 1071881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32) 1087c0c7269SOmar Sandoval #define BTRFS_IOC_ENCODED_WRITE_32 _IOW(BTRFS_IOCTL_MAGIC, 64, \ 1097c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32) 1102351f431SJosef Bacik #endif 111abccd00fSHugo Mills 1126cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 1131905a0f7SDavid Sterba static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode, 1141905a0f7SDavid Sterba unsigned int flags) 1156cbff00fSChristoph Hellwig { 1161905a0f7SDavid Sterba if (S_ISDIR(inode->i_mode)) 1176cbff00fSChristoph Hellwig return flags; 1181905a0f7SDavid Sterba else if (S_ISREG(inode->i_mode)) 1196cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 1206cbff00fSChristoph Hellwig else 1216cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 1226cbff00fSChristoph Hellwig } 123f46b5a66SChristoph Hellwig 1246cbff00fSChristoph Hellwig /* 125a157d4fdSDavid Sterba * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS 126a157d4fdSDavid Sterba * ioctl. 1276cbff00fSChristoph Hellwig */ 12877eea05eSBoris Burkov static unsigned int btrfs_inode_flags_to_fsflags(struct btrfs_inode *binode) 1296cbff00fSChristoph Hellwig { 1306cbff00fSChristoph Hellwig unsigned int iflags = 0; 13177eea05eSBoris Burkov u32 flags = binode->flags; 13214605409SBoris Burkov u32 ro_flags = binode->ro_flags; 1336cbff00fSChristoph Hellwig 1346cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 1356cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 1366cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 1376cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 1386cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 1396cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 1406cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 1416cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 1426cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 1436cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 1446cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 1456cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 146d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 147d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 14814605409SBoris Burkov if (ro_flags & BTRFS_INODE_RO_VERITY) 14914605409SBoris Burkov iflags |= FS_VERITY_FL; 150d0092bddSLi Zefan 15113f48dc9SSatoru Takeuchi if (flags & BTRFS_INODE_NOCOMPRESS) 152d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 15313f48dc9SSatoru Takeuchi else if (flags & BTRFS_INODE_COMPRESS) 15413f48dc9SSatoru Takeuchi iflags |= FS_COMPR_FL; 1556cbff00fSChristoph Hellwig 1566cbff00fSChristoph Hellwig return iflags; 1576cbff00fSChristoph Hellwig } 1586cbff00fSChristoph Hellwig 1596cbff00fSChristoph Hellwig /* 1606cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1616cbff00fSChristoph Hellwig */ 1627b6a221eSDavid Sterba void btrfs_sync_inode_flags_to_i_flags(struct inode *inode) 1636cbff00fSChristoph Hellwig { 1645c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 1653cc79392SFilipe Manana unsigned int new_fl = 0; 1666cbff00fSChristoph Hellwig 1675c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_SYNC) 1683cc79392SFilipe Manana new_fl |= S_SYNC; 1695c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_IMMUTABLE) 1703cc79392SFilipe Manana new_fl |= S_IMMUTABLE; 1715c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_APPEND) 1723cc79392SFilipe Manana new_fl |= S_APPEND; 1735c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_NOATIME) 1743cc79392SFilipe Manana new_fl |= S_NOATIME; 1755c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_DIRSYNC) 1763cc79392SFilipe Manana new_fl |= S_DIRSYNC; 17714605409SBoris Burkov if (binode->ro_flags & BTRFS_INODE_RO_VERITY) 17814605409SBoris Burkov new_fl |= S_VERITY; 1793cc79392SFilipe Manana 1803cc79392SFilipe Manana set_mask_bits(&inode->i_flags, 18114605409SBoris Burkov S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC | 18214605409SBoris Burkov S_VERITY, new_fl); 1836cbff00fSChristoph Hellwig } 1846cbff00fSChristoph Hellwig 185f37c563bSDavid Sterba /* 186f37c563bSDavid Sterba * Check if @flags are a supported and valid set of FS_*_FL flags and that 187f37c563bSDavid Sterba * the old and new flags are not conflicting 188f37c563bSDavid Sterba */ 189f37c563bSDavid Sterba static int check_fsflags(unsigned int old_flags, unsigned int flags) 19075e7cb7fSLiu Bo { 19175e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 19275e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 19375e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 194e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 195e1e8fb6aSLi Zefan FS_NOCOW_FL)) 19675e7cb7fSLiu Bo return -EOPNOTSUPP; 19775e7cb7fSLiu Bo 198f37c563bSDavid Sterba /* COMPR and NOCOMP on new/old are valid */ 19975e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 20075e7cb7fSLiu Bo return -EINVAL; 20175e7cb7fSLiu Bo 202f37c563bSDavid Sterba if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL)) 203f37c563bSDavid Sterba return -EINVAL; 204f37c563bSDavid Sterba 205f37c563bSDavid Sterba /* NOCOW and compression options are mutually exclusive */ 206f37c563bSDavid Sterba if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 207f37c563bSDavid Sterba return -EINVAL; 208f37c563bSDavid Sterba if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 209f37c563bSDavid Sterba return -EINVAL; 210f37c563bSDavid Sterba 21175e7cb7fSLiu Bo return 0; 21275e7cb7fSLiu Bo } 21375e7cb7fSLiu Bo 214d206e9c9SNaohiro Aota static int check_fsflags_compatible(struct btrfs_fs_info *fs_info, 215d206e9c9SNaohiro Aota unsigned int flags) 216d206e9c9SNaohiro Aota { 217d206e9c9SNaohiro Aota if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL)) 218d206e9c9SNaohiro Aota return -EPERM; 219d206e9c9SNaohiro Aota 220d206e9c9SNaohiro Aota return 0; 221d206e9c9SNaohiro Aota } 222d206e9c9SNaohiro Aota 22397fc2977SMiklos Szeredi /* 22497fc2977SMiklos Szeredi * Set flags/xflags from the internal inode flags. The remaining items of 22597fc2977SMiklos Szeredi * fsxattr are zeroed. 22697fc2977SMiklos Szeredi */ 22797fc2977SMiklos Szeredi int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa) 2286cbff00fSChristoph Hellwig { 22997fc2977SMiklos Szeredi struct btrfs_inode *binode = BTRFS_I(d_inode(dentry)); 23097fc2977SMiklos Szeredi 23177eea05eSBoris Burkov fileattr_fill_flags(fa, btrfs_inode_flags_to_fsflags(binode)); 23297fc2977SMiklos Szeredi return 0; 23397fc2977SMiklos Szeredi } 23497fc2977SMiklos Szeredi 23597fc2977SMiklos Szeredi int btrfs_fileattr_set(struct user_namespace *mnt_userns, 23697fc2977SMiklos Szeredi struct dentry *dentry, struct fileattr *fa) 23797fc2977SMiklos Szeredi { 23897fc2977SMiklos Szeredi struct inode *inode = d_inode(dentry); 2390b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 2405c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 2415c57b8b6SDavid Sterba struct btrfs_root *root = binode->root; 2426cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 2435aca2842SDarrick J. Wong unsigned int fsflags, old_fsflags; 2446cbff00fSChristoph Hellwig int ret; 245ff9fef55SAnand Jain const char *comp = NULL; 246f37c563bSDavid Sterba u32 binode_flags; 2476cbff00fSChristoph Hellwig 248b83cc969SLi Zefan if (btrfs_root_readonly(root)) 249b83cc969SLi Zefan return -EROFS; 250b83cc969SLi Zefan 25197fc2977SMiklos Szeredi if (fileattr_has_fsx(fa)) 25297fc2977SMiklos Szeredi return -EOPNOTSUPP; 2536cbff00fSChristoph Hellwig 25497fc2977SMiklos Szeredi fsflags = btrfs_mask_fsflags_for_type(inode, fa->flags); 25577eea05eSBoris Burkov old_fsflags = btrfs_inode_flags_to_fsflags(binode); 25697fc2977SMiklos Szeredi ret = check_fsflags(old_fsflags, fsflags); 257e7848683SJan Kara if (ret) 258e7848683SJan Kara return ret; 259e7848683SJan Kara 260d206e9c9SNaohiro Aota ret = check_fsflags_compatible(fs_info, fsflags); 261d206e9c9SNaohiro Aota if (ret) 26297fc2977SMiklos Szeredi return ret; 263d206e9c9SNaohiro Aota 264f37c563bSDavid Sterba binode_flags = binode->flags; 2655c57b8b6SDavid Sterba if (fsflags & FS_SYNC_FL) 266d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_SYNC; 2676cbff00fSChristoph Hellwig else 268d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_SYNC; 2695c57b8b6SDavid Sterba if (fsflags & FS_IMMUTABLE_FL) 270d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_IMMUTABLE; 2716cbff00fSChristoph Hellwig else 272d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_IMMUTABLE; 2735c57b8b6SDavid Sterba if (fsflags & FS_APPEND_FL) 274d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_APPEND; 2756cbff00fSChristoph Hellwig else 276d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_APPEND; 2775c57b8b6SDavid Sterba if (fsflags & FS_NODUMP_FL) 278d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODUMP; 2796cbff00fSChristoph Hellwig else 280d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODUMP; 2815c57b8b6SDavid Sterba if (fsflags & FS_NOATIME_FL) 282d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOATIME; 2836cbff00fSChristoph Hellwig else 284d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOATIME; 28597fc2977SMiklos Szeredi 28697fc2977SMiklos Szeredi /* If coming from FS_IOC_FSSETXATTR then skip unconverted flags */ 28797fc2977SMiklos Szeredi if (!fa->flags_valid) { 28897fc2977SMiklos Szeredi /* 1 item for the inode */ 28997fc2977SMiklos Szeredi trans = btrfs_start_transaction(root, 1); 2909b8a233bSRitesh Harjani if (IS_ERR(trans)) 2919b8a233bSRitesh Harjani return PTR_ERR(trans); 29297fc2977SMiklos Szeredi goto update_flags; 29397fc2977SMiklos Szeredi } 29497fc2977SMiklos Szeredi 2955c57b8b6SDavid Sterba if (fsflags & FS_DIRSYNC_FL) 296d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_DIRSYNC; 2976cbff00fSChristoph Hellwig else 298d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_DIRSYNC; 2995c57b8b6SDavid Sterba if (fsflags & FS_NOCOW_FL) { 30044e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 3017e97b8daSDavid Sterba /* 3027e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 3037e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 3047e97b8daSDavid Sterba * status of the file and will not set it. 3057e97b8daSDavid Sterba */ 3067e97b8daSDavid Sterba if (inode->i_size == 0) 307d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW | 308d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM; 3097e97b8daSDavid Sterba } else { 310d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW; 3117e97b8daSDavid Sterba } 3127e97b8daSDavid Sterba } else { 3137e97b8daSDavid Sterba /* 31401327610SNicholas D Steeves * Revert back under same assumptions as above 3157e97b8daSDavid Sterba */ 31644e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 3177e97b8daSDavid Sterba if (inode->i_size == 0) 318d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_NODATACOW | 319d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM); 3207e97b8daSDavid Sterba } else { 321d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODATACOW; 3227e97b8daSDavid Sterba } 3237e97b8daSDavid Sterba } 3246cbff00fSChristoph Hellwig 32575e7cb7fSLiu Bo /* 32675e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 32775e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 32875e7cb7fSLiu Bo * things smaller. 32975e7cb7fSLiu Bo */ 3305c57b8b6SDavid Sterba if (fsflags & FS_NOCOMP_FL) { 331d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_COMPRESS; 332d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOCOMPRESS; 3335c57b8b6SDavid Sterba } else if (fsflags & FS_COMPR_FL) { 33463541927SFilipe David Borba Manana 33597fc2977SMiklos Szeredi if (IS_SWAPFILE(inode)) 33697fc2977SMiklos Szeredi return -ETXTBSY; 337eede2bf3SOmar Sandoval 338d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_COMPRESS; 339d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOCOMPRESS; 34063541927SFilipe David Borba Manana 34193370509SDavid Sterba comp = btrfs_compress_type2str(fs_info->compress_type); 34293370509SDavid Sterba if (!comp || comp[0] == 0) 34393370509SDavid Sterba comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB); 344ebcb904dSLi Zefan } else { 345d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 34675e7cb7fSLiu Bo } 3476cbff00fSChristoph Hellwig 348ff9fef55SAnand Jain /* 349ff9fef55SAnand Jain * 1 for inode item 350ff9fef55SAnand Jain * 2 for properties 351ff9fef55SAnand Jain */ 352ff9fef55SAnand Jain trans = btrfs_start_transaction(root, 3); 35397fc2977SMiklos Szeredi if (IS_ERR(trans)) 35497fc2977SMiklos Szeredi return PTR_ERR(trans); 3556cbff00fSChristoph Hellwig 356ff9fef55SAnand Jain if (comp) { 357ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp, 358ff9fef55SAnand Jain strlen(comp), 0); 359ff9fef55SAnand Jain if (ret) { 360ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 361ff9fef55SAnand Jain goto out_end_trans; 362ff9fef55SAnand Jain } 363ff9fef55SAnand Jain } else { 364ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL, 365ff9fef55SAnand Jain 0, 0); 366ff9fef55SAnand Jain if (ret && ret != -ENODATA) { 367ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 368ff9fef55SAnand Jain goto out_end_trans; 369ff9fef55SAnand Jain } 370ff9fef55SAnand Jain } 371ff9fef55SAnand Jain 37297fc2977SMiklos Szeredi update_flags: 373d2b8fcfeSAnand Jain binode->flags = binode_flags; 3747b6a221eSDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 3750c4d2d95SJosef Bacik inode_inc_iversion(inode); 376c2050a45SDeepa Dinamani inode->i_ctime = current_time(inode); 3779a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); 3786cbff00fSChristoph Hellwig 379ff9fef55SAnand Jain out_end_trans: 3803a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3812d4e6f6aSliubo return ret; 3826cbff00fSChristoph Hellwig } 3836cbff00fSChristoph Hellwig 3840d7ed32cSDavid Sterba /* 3850d7ed32cSDavid Sterba * Start exclusive operation @type, return true on success 3860d7ed32cSDavid Sterba */ 387c3e1f96cSGoldwyn Rodrigues bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, 388c3e1f96cSGoldwyn Rodrigues enum btrfs_exclusive_operation type) 389c3e1f96cSGoldwyn Rodrigues { 3900d7ed32cSDavid Sterba bool ret = false; 3910d7ed32cSDavid Sterba 3920d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 3930d7ed32cSDavid Sterba if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) { 3940d7ed32cSDavid Sterba fs_info->exclusive_operation = type; 3950d7ed32cSDavid Sterba ret = true; 3960d7ed32cSDavid Sterba } 3970d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 3980d7ed32cSDavid Sterba 3990d7ed32cSDavid Sterba return ret; 400c3e1f96cSGoldwyn Rodrigues } 401c3e1f96cSGoldwyn Rodrigues 402578bda9eSDavid Sterba /* 403578bda9eSDavid Sterba * Conditionally allow to enter the exclusive operation in case it's compatible 404578bda9eSDavid Sterba * with the running one. This must be paired with btrfs_exclop_start_unlock and 405578bda9eSDavid Sterba * btrfs_exclop_finish. 406578bda9eSDavid Sterba * 407578bda9eSDavid Sterba * Compatibility: 408578bda9eSDavid Sterba * - the same type is already running 409621a1ee1SNikolay Borisov * - when trying to add a device and balance has been paused 410578bda9eSDavid Sterba * - not BTRFS_EXCLOP_NONE - this is intentionally incompatible and the caller 411578bda9eSDavid Sterba * must check the condition first that would allow none -> @type 412578bda9eSDavid Sterba */ 413578bda9eSDavid Sterba bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info, 414578bda9eSDavid Sterba enum btrfs_exclusive_operation type) 415578bda9eSDavid Sterba { 416578bda9eSDavid Sterba spin_lock(&fs_info->super_lock); 417621a1ee1SNikolay Borisov if (fs_info->exclusive_operation == type || 418621a1ee1SNikolay Borisov (fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED && 419621a1ee1SNikolay Borisov type == BTRFS_EXCLOP_DEV_ADD)) 420578bda9eSDavid Sterba return true; 421578bda9eSDavid Sterba 422578bda9eSDavid Sterba spin_unlock(&fs_info->super_lock); 423578bda9eSDavid Sterba return false; 424578bda9eSDavid Sterba } 425578bda9eSDavid Sterba 426578bda9eSDavid Sterba void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info) 427578bda9eSDavid Sterba { 428578bda9eSDavid Sterba spin_unlock(&fs_info->super_lock); 429578bda9eSDavid Sterba } 430578bda9eSDavid Sterba 431c3e1f96cSGoldwyn Rodrigues void btrfs_exclop_finish(struct btrfs_fs_info *fs_info) 432c3e1f96cSGoldwyn Rodrigues { 4330d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 434c3e1f96cSGoldwyn Rodrigues WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE); 4350d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 43666a2823cSGoldwyn Rodrigues sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation"); 437c3e1f96cSGoldwyn Rodrigues } 438c3e1f96cSGoldwyn Rodrigues 439efc0e69cSNikolay Borisov void btrfs_exclop_balance(struct btrfs_fs_info *fs_info, 440efc0e69cSNikolay Borisov enum btrfs_exclusive_operation op) 441efc0e69cSNikolay Borisov { 442efc0e69cSNikolay Borisov switch (op) { 443efc0e69cSNikolay Borisov case BTRFS_EXCLOP_BALANCE_PAUSED: 444efc0e69cSNikolay Borisov spin_lock(&fs_info->super_lock); 445efc0e69cSNikolay Borisov ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE || 446efc0e69cSNikolay Borisov fs_info->exclusive_operation == BTRFS_EXCLOP_DEV_ADD); 447efc0e69cSNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE_PAUSED; 448efc0e69cSNikolay Borisov spin_unlock(&fs_info->super_lock); 449efc0e69cSNikolay Borisov break; 450efc0e69cSNikolay Borisov case BTRFS_EXCLOP_BALANCE: 451efc0e69cSNikolay Borisov spin_lock(&fs_info->super_lock); 452efc0e69cSNikolay Borisov ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED); 453efc0e69cSNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE; 454efc0e69cSNikolay Borisov spin_unlock(&fs_info->super_lock); 455efc0e69cSNikolay Borisov break; 456efc0e69cSNikolay Borisov default: 457efc0e69cSNikolay Borisov btrfs_warn(fs_info, 458efc0e69cSNikolay Borisov "invalid exclop balance operation %d requested", op); 459efc0e69cSNikolay Borisov } 460efc0e69cSNikolay Borisov } 461efc0e69cSNikolay Borisov 462dc408ccdSSahil Kang static int btrfs_ioctl_getversion(struct inode *inode, int __user *arg) 4636cbff00fSChristoph Hellwig { 4646cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 4656cbff00fSChristoph Hellwig } 466f46b5a66SChristoph Hellwig 467b929c1d8SMarcos Paulo de Souza static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, 468b929c1d8SMarcos Paulo de Souza void __user *arg) 469f7039b1dSLi Dongyang { 470f7039b1dSLi Dongyang struct btrfs_device *device; 471f7039b1dSLi Dongyang struct fstrim_range range; 472f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 473f7039b1dSLi Dongyang u64 num_devices = 0; 474f7039b1dSLi Dongyang int ret; 475f7039b1dSLi Dongyang 476f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 477f7039b1dSLi Dongyang return -EPERM; 478f7039b1dSLi Dongyang 479f35f06c3SFilipe Manana /* 4801cb3dc3fSNaohiro Aota * btrfs_trim_block_group() depends on space cache, which is not 4811cb3dc3fSNaohiro Aota * available in zoned filesystem. So, disallow fitrim on a zoned 4821cb3dc3fSNaohiro Aota * filesystem for now. 4831cb3dc3fSNaohiro Aota */ 4841cb3dc3fSNaohiro Aota if (btrfs_is_zoned(fs_info)) 4851cb3dc3fSNaohiro Aota return -EOPNOTSUPP; 4861cb3dc3fSNaohiro Aota 4871cb3dc3fSNaohiro Aota /* 488f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 489f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 490f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 491f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 492f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 493f35f06c3SFilipe Manana */ 494f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 495f35f06c3SFilipe Manana return -EROFS; 496f35f06c3SFilipe Manana 4971f78160cSXiao Guangrong rcu_read_lock(); 4981f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 4991f78160cSXiao Guangrong dev_list) { 5007b47ef52SChristoph Hellwig if (!device->bdev || !bdev_max_discard_sectors(device->bdev)) 501f7039b1dSLi Dongyang continue; 502f7039b1dSLi Dongyang num_devices++; 5037b47ef52SChristoph Hellwig minlen = min_t(u64, bdev_discard_granularity(device->bdev), 504f7039b1dSLi Dongyang minlen); 505f7039b1dSLi Dongyang } 5061f78160cSXiao Guangrong rcu_read_unlock(); 507f4c697e6SLukas Czerner 508f7039b1dSLi Dongyang if (!num_devices) 509f7039b1dSLi Dongyang return -EOPNOTSUPP; 510f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 511f7039b1dSLi Dongyang return -EFAULT; 5126ba9fc8eSQu Wenruo 5136ba9fc8eSQu Wenruo /* 5146ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 5156ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 5166ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 5176ba9fc8eSQu Wenruo */ 5186ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 519f4c697e6SLukas Czerner return -EINVAL; 520f7039b1dSLi Dongyang 521f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 5222ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 523f7039b1dSLi Dongyang if (ret < 0) 524f7039b1dSLi Dongyang return ret; 525f7039b1dSLi Dongyang 526f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 527f7039b1dSLi Dongyang return -EFAULT; 528f7039b1dSLi Dongyang 529f7039b1dSLi Dongyang return 0; 530f7039b1dSLi Dongyang } 531f7039b1dSLi Dongyang 532e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 533dd5f9615SStefan Behrens { 53446e0f66aSChris Mason int i; 53546e0f66aSChris Mason 53646e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 53746e0f66aSChris Mason if (uuid[i]) 53846e0f66aSChris Mason return 0; 53946e0f66aSChris Mason } 54046e0f66aSChris Mason return 1; 541dd5f9615SStefan Behrens } 542dd5f9615SStefan Behrens 5433538d68dSOmar Sandoval /* 5443538d68dSOmar Sandoval * Calculate the number of transaction items to reserve for creating a subvolume 5453538d68dSOmar Sandoval * or snapshot, not including the inode, directory entries, or parent directory. 5463538d68dSOmar Sandoval */ 5473538d68dSOmar Sandoval static unsigned int create_subvol_num_items(struct btrfs_qgroup_inherit *inherit) 5483538d68dSOmar Sandoval { 5493538d68dSOmar Sandoval /* 5503538d68dSOmar Sandoval * 1 to add root block 5513538d68dSOmar Sandoval * 1 to add root item 5523538d68dSOmar Sandoval * 1 to add root ref 5533538d68dSOmar Sandoval * 1 to add root backref 5543538d68dSOmar Sandoval * 1 to add UUID item 5553538d68dSOmar Sandoval * 1 to add qgroup info 5563538d68dSOmar Sandoval * 1 to add qgroup limit 5573538d68dSOmar Sandoval * 5583538d68dSOmar Sandoval * Ideally the last two would only be accounted if qgroups are enabled, 5593538d68dSOmar Sandoval * but that can change between now and the time we would insert them. 5603538d68dSOmar Sandoval */ 5613538d68dSOmar Sandoval unsigned int num_items = 7; 5623538d68dSOmar Sandoval 5633538d68dSOmar Sandoval if (inherit) { 5643538d68dSOmar Sandoval /* 2 to add qgroup relations for each inherited qgroup */ 5653538d68dSOmar Sandoval num_items += 2 * inherit->num_qgroups; 5663538d68dSOmar Sandoval } 5673538d68dSOmar Sandoval return num_items; 5683538d68dSOmar Sandoval } 5693538d68dSOmar Sandoval 5704d4340c9SChristian Brauner static noinline int create_subvol(struct user_namespace *mnt_userns, 5714d4340c9SChristian Brauner struct inode *dir, struct dentry *dentry, 5728696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 573f46b5a66SChristoph Hellwig { 5740b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 575f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 576f46b5a66SChristoph Hellwig struct btrfs_key key; 57749a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 578f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 579f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 580d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 58176dda93cSYan, Zheng struct btrfs_root *new_root; 582d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 58395582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 5843538d68dSOmar Sandoval struct btrfs_new_inode_args new_inode_args = { 5853538d68dSOmar Sandoval .dir = dir, 5863538d68dSOmar Sandoval .dentry = dentry, 5873538d68dSOmar Sandoval .subvol = true, 5883538d68dSOmar Sandoval }; 5893538d68dSOmar Sandoval unsigned int trans_num_items; 590f46b5a66SChristoph Hellwig int ret; 5912256e901SOmar Sandoval dev_t anon_dev; 592f46b5a66SChristoph Hellwig u64 objectid; 593f46b5a66SChristoph Hellwig 59449a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 59549a3c4d9SDavid Sterba if (!root_item) 59649a3c4d9SDavid Sterba return -ENOMEM; 59749a3c4d9SDavid Sterba 598543068a2SNikolay Borisov ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); 5992fbe8c8aSAl Viro if (ret) 6002256e901SOmar Sandoval goto out_root_item; 6012dfb1e43SQu Wenruo 602e09fe2d2SQu Wenruo /* 603e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 60401327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 605e09fe2d2SQu Wenruo */ 60649a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 60749a3c4d9SDavid Sterba ret = -ENOSPC; 6082256e901SOmar Sandoval goto out_root_item; 60949a3c4d9SDavid Sterba } 610e09fe2d2SQu Wenruo 6112256e901SOmar Sandoval ret = get_anon_bdev(&anon_dev); 6122256e901SOmar Sandoval if (ret < 0) 6132256e901SOmar Sandoval goto out_root_item; 6142256e901SOmar Sandoval 6153538d68dSOmar Sandoval new_inode_args.inode = btrfs_new_subvol_inode(mnt_userns, dir); 6163538d68dSOmar Sandoval if (!new_inode_args.inode) { 617a1fd0c35SOmar Sandoval ret = -ENOMEM; 618a1fd0c35SOmar Sandoval goto out_anon_dev; 619a1fd0c35SOmar Sandoval } 6203538d68dSOmar Sandoval ret = btrfs_new_inode_prepare(&new_inode_args, &trans_num_items); 621d5c12070SMiao Xie if (ret) 622a1fd0c35SOmar Sandoval goto out_inode; 6233538d68dSOmar Sandoval trans_num_items += create_subvol_num_items(inherit); 6243538d68dSOmar Sandoval 6253538d68dSOmar Sandoval btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 6263538d68dSOmar Sandoval ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 6273538d68dSOmar Sandoval trans_num_items, false); 6283538d68dSOmar Sandoval if (ret) 6293538d68dSOmar Sandoval goto out_new_inode_args; 630f46b5a66SChristoph Hellwig 631d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 632d5c12070SMiao Xie if (IS_ERR(trans)) { 633d5c12070SMiao Xie ret = PTR_ERR(trans); 634e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 6353538d68dSOmar Sandoval goto out_new_inode_args; 636d5c12070SMiao Xie } 637d5c12070SMiao Xie trans->block_rsv = &block_rsv; 638d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 639f46b5a66SChristoph Hellwig 640a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 6416f72c7e2SArne Jansen if (ret) 6422256e901SOmar Sandoval goto out; 6436f72c7e2SArne Jansen 6449631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 6459631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 6468e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 6478e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 6482256e901SOmar Sandoval goto out; 6498e8a1e31SJosef Bacik } 650f46b5a66SChristoph Hellwig 651f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 652f46b5a66SChristoph Hellwig 65349a3c4d9SDavid Sterba inode_item = &root_item->inode; 6543cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6553cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6563cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 657da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6580b246afaSJeff Mahoney fs_info->nodesize); 6593cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 660f46b5a66SChristoph Hellwig 66149a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 66249a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6633cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 66408fe4db1SLi Zefan 66549a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 66649a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 66749a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 66849a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 66949a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 67049a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 671f46b5a66SChristoph Hellwig 67249a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 67349a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 674807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 67549a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 67649a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 67749a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 67849a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 67949a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 680f46b5a66SChristoph Hellwig 681925baeddSChris Mason btrfs_tree_unlock(leaf); 682f46b5a66SChristoph Hellwig 68369948022SNikolay Borisov btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); 684f46b5a66SChristoph Hellwig 685f46b5a66SChristoph Hellwig key.objectid = objectid; 6865d4f98a2SYan Zheng key.offset = 0; 687962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 6880b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 68949a3c4d9SDavid Sterba root_item); 69067addf29SFilipe Manana if (ret) { 69167addf29SFilipe Manana /* 69267addf29SFilipe Manana * Since we don't abort the transaction in this case, free the 69367addf29SFilipe Manana * tree block so that we don't leak space and leave the 69467addf29SFilipe Manana * filesystem in an inconsistent state (an extent item in the 6957a163608SFilipe Manana * extent tree with a backreference for a root that does not 696212a58fdSFilipe Manana * exists). 69767addf29SFilipe Manana */ 698212a58fdSFilipe Manana btrfs_tree_lock(leaf); 699212a58fdSFilipe Manana btrfs_clean_tree_block(leaf); 700212a58fdSFilipe Manana btrfs_tree_unlock(leaf); 7017a163608SFilipe Manana btrfs_free_tree_block(trans, objectid, leaf, 0, 1); 70267addf29SFilipe Manana free_extent_buffer(leaf); 7032256e901SOmar Sandoval goto out; 70467addf29SFilipe Manana } 70567addf29SFilipe Manana 70667addf29SFilipe Manana free_extent_buffer(leaf); 70767addf29SFilipe Manana leaf = NULL; 708f46b5a66SChristoph Hellwig 7092dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 71079787eaaSJeff Mahoney if (IS_ERR(new_root)) { 71179787eaaSJeff Mahoney ret = PTR_ERR(new_root); 71266642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 7132256e901SOmar Sandoval goto out; 71479787eaaSJeff Mahoney } 7152256e901SOmar Sandoval /* anon_dev is owned by new_root now. */ 7162dfb1e43SQu Wenruo anon_dev = 0; 7173538d68dSOmar Sandoval BTRFS_I(new_inode_args.inode)->root = new_root; 7183538d68dSOmar Sandoval /* ... and new_root is owned by new_inode_args.inode now. */ 71976dda93cSYan, Zheng 720221581e4SJosef Bacik ret = btrfs_record_root_in_trans(trans, new_root); 721221581e4SJosef Bacik if (ret) { 722221581e4SJosef Bacik btrfs_abort_transaction(trans, ret); 7232256e901SOmar Sandoval goto out; 724c7e54b51SJosef Bacik } 7250660b5afSChris Mason 726cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7276bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 728caae78e0SOmar Sandoval if (ret) { 72966642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 730caae78e0SOmar Sandoval goto out; 731caae78e0SOmar Sandoval } 732dd5f9615SStefan Behrens 733caae78e0SOmar Sandoval ret = btrfs_create_new_inode(trans, &new_inode_args); 734caae78e0SOmar Sandoval if (ret) { 735caae78e0SOmar Sandoval btrfs_abort_transaction(trans, ret); 736caae78e0SOmar Sandoval goto out; 737caae78e0SOmar Sandoval } 738caae78e0SOmar Sandoval 739caae78e0SOmar Sandoval d_instantiate_new(dentry, new_inode_args.inode); 740caae78e0SOmar Sandoval new_inode_args.inode = NULL; 741f46b5a66SChristoph Hellwig 7422256e901SOmar Sandoval out: 743d5c12070SMiao Xie trans->block_rsv = NULL; 744d5c12070SMiao Xie trans->bytes_reserved = 0; 745e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 746de6e8200SLiu Bo 7471b58ae0eSFilipe Manana if (ret) 7481b58ae0eSFilipe Manana btrfs_end_transaction(trans); 7491b58ae0eSFilipe Manana else 7501b58ae0eSFilipe Manana ret = btrfs_commit_transaction(trans); 7513538d68dSOmar Sandoval out_new_inode_args: 7523538d68dSOmar Sandoval btrfs_new_inode_args_destroy(&new_inode_args); 753a1fd0c35SOmar Sandoval out_inode: 7543538d68dSOmar Sandoval iput(new_inode_args.inode); 7552256e901SOmar Sandoval out_anon_dev: 7562dfb1e43SQu Wenruo if (anon_dev) 7572dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 7582256e901SOmar Sandoval out_root_item: 75949a3c4d9SDavid Sterba kfree(root_item); 76049a3c4d9SDavid Sterba return ret; 761f46b5a66SChristoph Hellwig } 762f46b5a66SChristoph Hellwig 763e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7649babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 765e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 766f46b5a66SChristoph Hellwig { 7670b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7682e4bfab9SYan, Zheng struct inode *inode; 769f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 7703538d68dSOmar Sandoval unsigned int trans_num_items; 771f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7722e4bfab9SYan, Zheng int ret; 773f46b5a66SChristoph Hellwig 774813febdbSJosef Bacik /* We do not support snapshotting right now. */ 775813febdbSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 776813febdbSJosef Bacik btrfs_warn(fs_info, 777813febdbSJosef Bacik "extent tree v2 doesn't support snapshotting yet"); 778813febdbSJosef Bacik return -EOPNOTSUPP; 779813febdbSJosef Bacik } 780813febdbSJosef Bacik 78192a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 782f46b5a66SChristoph Hellwig return -EINVAL; 783f46b5a66SChristoph Hellwig 784eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 785eede2bf3SOmar Sandoval btrfs_warn(fs_info, 786eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 787eede2bf3SOmar Sandoval return -ETXTBSY; 788eede2bf3SOmar Sandoval } 789eede2bf3SOmar Sandoval 79023269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 791a1ee7362SDavid Sterba if (!pending_snapshot) 792a1ee7362SDavid Sterba return -ENOMEM; 793a1ee7362SDavid Sterba 7942dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 7952dfb1e43SQu Wenruo if (ret < 0) 7962dfb1e43SQu Wenruo goto free_pending; 797b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 79823269bf5SDavid Sterba GFP_KERNEL); 7998546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 8008546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 801b0c0ea63SDavid Sterba ret = -ENOMEM; 802b0c0ea63SDavid Sterba goto free_pending; 803b0c0ea63SDavid Sterba } 804b0c0ea63SDavid Sterba 80566d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 80666d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 807d5c12070SMiao Xie /* 8083538d68dSOmar Sandoval * 1 to add dir item 8093538d68dSOmar Sandoval * 1 to add dir index 8103538d68dSOmar Sandoval * 1 to update parent inode item 811d5c12070SMiao Xie */ 8123538d68dSOmar Sandoval trans_num_items = create_subvol_num_items(inherit) + 3; 813d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 8143538d68dSOmar Sandoval &pending_snapshot->block_rsv, 8153538d68dSOmar Sandoval trans_num_items, false); 816d5c12070SMiao Xie if (ret) 817c11fbb6eSRobbie Ko goto free_pending; 818d5c12070SMiao Xie 819a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 820a22285a6SYan, Zheng pending_snapshot->root = root; 821b83cc969SLi Zefan pending_snapshot->readonly = readonly; 822e9662f70SMiao Xie pending_snapshot->dir = dir; 8238696c533SMiao Xie pending_snapshot->inherit = inherit; 824a22285a6SYan, Zheng 825d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 826a22285a6SYan, Zheng if (IS_ERR(trans)) { 827a22285a6SYan, Zheng ret = PTR_ERR(trans); 828a22285a6SYan, Zheng goto fail; 829a22285a6SYan, Zheng } 830a22285a6SYan, Zheng 83128b21c55SFilipe Manana trans->pending_snapshot = pending_snapshot; 8329babda9fSNikolay Borisov 8333a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 834aec8030aSMiao Xie if (ret) 835c37b2b62SJosef Bacik goto fail; 836a22285a6SYan, Zheng 837a22285a6SYan, Zheng ret = pending_snapshot->error; 838f46b5a66SChristoph Hellwig if (ret) 8392e4bfab9SYan, Zheng goto fail; 840f46b5a66SChristoph Hellwig 841d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 842d3797308SChris Mason if (ret) 843d3797308SChris Mason goto fail; 844d3797308SChris Mason 8452b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8462e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8472e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8482e4bfab9SYan, Zheng goto fail; 8492e4bfab9SYan, Zheng } 8505662344bSTsutomu Itoh 8512e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8522e4bfab9SYan, Zheng ret = 0; 8532dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8542e4bfab9SYan, Zheng fail: 8552dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 8562dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8572dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 85800246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 859e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 860b0c0ea63SDavid Sterba free_pending: 8612dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8622dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 863b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8648546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 865a1ee7362SDavid Sterba kfree(pending_snapshot); 866a1ee7362SDavid Sterba 867f46b5a66SChristoph Hellwig return ret; 868f46b5a66SChristoph Hellwig } 869f46b5a66SChristoph Hellwig 8704260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8714260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8724260f7c7SSage Weil * whether the type of victim is right. 8734260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8744260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8754260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8764260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8774260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8784260f7c7SSage Weil * a. be owner of dir, or 8794260f7c7SSage Weil * b. be owner of victim, or 8804260f7c7SSage Weil * c. have CAP_FOWNER capability 88101327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 8824260f7c7SSage Weil * links pointing to it. 8834260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8844260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 8854260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 8864260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 8874260f7c7SSage Weil * nfs_async_unlink(). 8884260f7c7SSage Weil */ 8894260f7c7SSage Weil 890c4ed533bSChristian Brauner static int btrfs_may_delete(struct user_namespace *mnt_userns, 891c4ed533bSChristian Brauner struct inode *dir, struct dentry *victim, int isdir) 8924260f7c7SSage Weil { 8934260f7c7SSage Weil int error; 8944260f7c7SSage Weil 8952b0143b5SDavid Howells if (d_really_is_negative(victim)) 8964260f7c7SSage Weil return -ENOENT; 8974260f7c7SSage Weil 8982b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 8994fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 9004260f7c7SSage Weil 901c4ed533bSChristian Brauner error = inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); 9024260f7c7SSage Weil if (error) 9034260f7c7SSage Weil return error; 9044260f7c7SSage Weil if (IS_APPEND(dir)) 9054260f7c7SSage Weil return -EPERM; 906c4ed533bSChristian Brauner if (check_sticky(mnt_userns, dir, d_inode(victim)) || 907ba73d987SChristian Brauner IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) || 908ba73d987SChristian Brauner IS_SWAPFILE(d_inode(victim))) 9094260f7c7SSage Weil return -EPERM; 9104260f7c7SSage Weil if (isdir) { 911e36cb0b8SDavid Howells if (!d_is_dir(victim)) 9124260f7c7SSage Weil return -ENOTDIR; 9134260f7c7SSage Weil if (IS_ROOT(victim)) 9144260f7c7SSage Weil return -EBUSY; 915e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 9164260f7c7SSage Weil return -EISDIR; 9174260f7c7SSage Weil if (IS_DEADDIR(dir)) 9184260f7c7SSage Weil return -ENOENT; 9194260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 9204260f7c7SSage Weil return -EBUSY; 9214260f7c7SSage Weil return 0; 9224260f7c7SSage Weil } 9234260f7c7SSage Weil 924cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 9254d4340c9SChristian Brauner static inline int btrfs_may_create(struct user_namespace *mnt_userns, 9264d4340c9SChristian Brauner struct inode *dir, struct dentry *child) 927cb8e7090SChristoph Hellwig { 9282b0143b5SDavid Howells if (d_really_is_positive(child)) 929cb8e7090SChristoph Hellwig return -EEXIST; 930cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 931cb8e7090SChristoph Hellwig return -ENOENT; 9324d4340c9SChristian Brauner if (!fsuidgid_has_mapping(dir->i_sb, mnt_userns)) 9335474bf40SChristian Brauner return -EOVERFLOW; 9344d4340c9SChristian Brauner return inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); 935cb8e7090SChristoph Hellwig } 936cb8e7090SChristoph Hellwig 937cb8e7090SChristoph Hellwig /* 938cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 939cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 940cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 941cb8e7090SChristoph Hellwig */ 94292872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 9434d4340c9SChristian Brauner struct user_namespace *mnt_userns, 94452f75f4fSDavid Sterba const char *name, int namelen, 94572fd032eSSage Weil struct btrfs_root *snap_src, 9469babda9fSNikolay Borisov bool readonly, 9478696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 948cb8e7090SChristoph Hellwig { 9492b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9500b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 951cb8e7090SChristoph Hellwig struct dentry *dentry; 952cb8e7090SChristoph Hellwig int error; 953cb8e7090SChristoph Hellwig 95400235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 95500235411SAl Viro if (error == -EINTR) 95600235411SAl Viro return error; 957cb8e7090SChristoph Hellwig 9584d4340c9SChristian Brauner dentry = lookup_one(mnt_userns, name, parent->dentry, namelen); 959cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 960cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 961cb8e7090SChristoph Hellwig goto out_unlock; 962cb8e7090SChristoph Hellwig 9634d4340c9SChristian Brauner error = btrfs_may_create(mnt_userns, dir, dentry); 964cb8e7090SChristoph Hellwig if (error) 965a874a63eSLiu Bo goto out_dput; 966cb8e7090SChristoph Hellwig 9679c52057cSChris Mason /* 9689c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9699c52057cSChris Mason * check for them now when we can safely fail 9709c52057cSChris Mason */ 9719c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 9729c52057cSChris Mason dir->i_ino, name, 9739c52057cSChris Mason namelen); 9749c52057cSChris Mason if (error) 9759c52057cSChris Mason goto out_dput; 9769c52057cSChris Mason 9770b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 97876dda93cSYan, Zheng 97976dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 98076dda93cSYan, Zheng goto out_up_read; 98176dda93cSYan, Zheng 9829babda9fSNikolay Borisov if (snap_src) 9839babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 9849babda9fSNikolay Borisov else 98570dc55f4SOmar Sandoval error = create_subvol(mnt_userns, dir, dentry, inherit); 9869babda9fSNikolay Borisov 98776dda93cSYan, Zheng if (!error) 98876dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 98976dda93cSYan, Zheng out_up_read: 9900b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 991cb8e7090SChristoph Hellwig out_dput: 992cb8e7090SChristoph Hellwig dput(dentry); 993cb8e7090SChristoph Hellwig out_unlock: 99464708539SJosef Bacik btrfs_inode_unlock(dir, 0); 995cb8e7090SChristoph Hellwig return error; 996cb8e7090SChristoph Hellwig } 997cb8e7090SChristoph Hellwig 998c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 9994d4340c9SChristian Brauner struct user_namespace *mnt_userns, 1000c11fbb6eSRobbie Ko const char *name, int namelen, 1001c11fbb6eSRobbie Ko struct btrfs_root *root, 1002c11fbb6eSRobbie Ko bool readonly, 1003c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 1004c11fbb6eSRobbie Ko { 1005c11fbb6eSRobbie Ko int ret; 1006c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 1007c11fbb6eSRobbie Ko 1008c11fbb6eSRobbie Ko /* 1009c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 1010c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 1011c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 1012c11fbb6eSRobbie Ko */ 1013c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 1014c11fbb6eSRobbie Ko 1015f9baa501SFilipe Manana ret = btrfs_start_delalloc_snapshot(root, false); 1016c11fbb6eSRobbie Ko if (ret) 1017c11fbb6eSRobbie Ko goto out; 1018c11fbb6eSRobbie Ko 1019c11fbb6eSRobbie Ko /* 1020c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 1021c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 1022c11fbb6eSRobbie Ko * creation. 1023c11fbb6eSRobbie Ko */ 1024c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 1025c11fbb6eSRobbie Ko snapshot_force_cow = true; 1026c11fbb6eSRobbie Ko 1027c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 1028c11fbb6eSRobbie Ko 10294d4340c9SChristian Brauner ret = btrfs_mksubvol(parent, mnt_userns, name, namelen, 1030c11fbb6eSRobbie Ko root, readonly, inherit); 1031c11fbb6eSRobbie Ko out: 1032c11fbb6eSRobbie Ko if (snapshot_force_cow) 1033c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 1034c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 1035c11fbb6eSRobbie Ko return ret; 1036c11fbb6eSRobbie Ko } 1037c11fbb6eSRobbie Ko 1038d5633b0dSQu Wenruo /* 1039d5633b0dSQu Wenruo * Defrag specific helper to get an extent map. 1040d5633b0dSQu Wenruo * 1041d5633b0dSQu Wenruo * Differences between this and btrfs_get_extent() are: 1042d5633b0dSQu Wenruo * 1043d5633b0dSQu Wenruo * - No extent_map will be added to inode->extent_tree 1044d5633b0dSQu Wenruo * To reduce memory usage in the long run. 1045d5633b0dSQu Wenruo * 1046d5633b0dSQu Wenruo * - Extra optimization to skip file extents older than @newer_than 1047d5633b0dSQu Wenruo * By using btrfs_search_forward() we can skip entire file ranges that 1048d5633b0dSQu Wenruo * have extents created in past transactions, because btrfs_search_forward() 1049d5633b0dSQu Wenruo * will not visit leaves and nodes with a generation smaller than given 1050d5633b0dSQu Wenruo * minimal generation threshold (@newer_than). 1051d5633b0dSQu Wenruo * 1052d5633b0dSQu Wenruo * Return valid em if we find a file extent matching the requirement. 1053d5633b0dSQu Wenruo * Return NULL if we can not find a file extent matching the requirement. 1054d5633b0dSQu Wenruo * 1055d5633b0dSQu Wenruo * Return ERR_PTR() for error. 1056d5633b0dSQu Wenruo */ 1057d5633b0dSQu Wenruo static struct extent_map *defrag_get_extent(struct btrfs_inode *inode, 1058d5633b0dSQu Wenruo u64 start, u64 newer_than) 1059d5633b0dSQu Wenruo { 1060d5633b0dSQu Wenruo struct btrfs_root *root = inode->root; 1061d5633b0dSQu Wenruo struct btrfs_file_extent_item *fi; 1062d5633b0dSQu Wenruo struct btrfs_path path = { 0 }; 1063d5633b0dSQu Wenruo struct extent_map *em; 1064d5633b0dSQu Wenruo struct btrfs_key key; 1065d5633b0dSQu Wenruo u64 ino = btrfs_ino(inode); 1066d5633b0dSQu Wenruo int ret; 1067d5633b0dSQu Wenruo 1068d5633b0dSQu Wenruo em = alloc_extent_map(); 1069d5633b0dSQu Wenruo if (!em) { 1070d5633b0dSQu Wenruo ret = -ENOMEM; 1071d5633b0dSQu Wenruo goto err; 1072d5633b0dSQu Wenruo } 1073d5633b0dSQu Wenruo 1074d5633b0dSQu Wenruo key.objectid = ino; 1075d5633b0dSQu Wenruo key.type = BTRFS_EXTENT_DATA_KEY; 1076d5633b0dSQu Wenruo key.offset = start; 1077d5633b0dSQu Wenruo 1078d5633b0dSQu Wenruo if (newer_than) { 1079d5633b0dSQu Wenruo ret = btrfs_search_forward(root, &key, &path, newer_than); 1080d5633b0dSQu Wenruo if (ret < 0) 1081d5633b0dSQu Wenruo goto err; 1082d5633b0dSQu Wenruo /* Can't find anything newer */ 1083d5633b0dSQu Wenruo if (ret > 0) 1084d5633b0dSQu Wenruo goto not_found; 1085d5633b0dSQu Wenruo } else { 1086d5633b0dSQu Wenruo ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); 1087d5633b0dSQu Wenruo if (ret < 0) 1088d5633b0dSQu Wenruo goto err; 1089d5633b0dSQu Wenruo } 1090d5633b0dSQu Wenruo if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) { 1091d5633b0dSQu Wenruo /* 1092d5633b0dSQu Wenruo * If btrfs_search_slot() makes path to point beyond nritems, 1093d5633b0dSQu Wenruo * we should not have an empty leaf, as this inode must at 1094d5633b0dSQu Wenruo * least have its INODE_ITEM. 1095d5633b0dSQu Wenruo */ 1096d5633b0dSQu Wenruo ASSERT(btrfs_header_nritems(path.nodes[0])); 1097d5633b0dSQu Wenruo path.slots[0] = btrfs_header_nritems(path.nodes[0]) - 1; 1098d5633b0dSQu Wenruo } 1099d5633b0dSQu Wenruo btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); 1100d5633b0dSQu Wenruo /* Perfect match, no need to go one slot back */ 1101d5633b0dSQu Wenruo if (key.objectid == ino && key.type == BTRFS_EXTENT_DATA_KEY && 1102d5633b0dSQu Wenruo key.offset == start) 1103d5633b0dSQu Wenruo goto iterate; 1104d5633b0dSQu Wenruo 1105d5633b0dSQu Wenruo /* We didn't find a perfect match, needs to go one slot back */ 1106d5633b0dSQu Wenruo if (path.slots[0] > 0) { 1107d5633b0dSQu Wenruo btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); 1108d5633b0dSQu Wenruo if (key.objectid == ino && key.type == BTRFS_EXTENT_DATA_KEY) 1109d5633b0dSQu Wenruo path.slots[0]--; 1110d5633b0dSQu Wenruo } 1111d5633b0dSQu Wenruo 1112d5633b0dSQu Wenruo iterate: 1113d5633b0dSQu Wenruo /* Iterate through the path to find a file extent covering @start */ 1114d5633b0dSQu Wenruo while (true) { 1115d5633b0dSQu Wenruo u64 extent_end; 1116d5633b0dSQu Wenruo 1117d5633b0dSQu Wenruo if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) 1118d5633b0dSQu Wenruo goto next; 1119d5633b0dSQu Wenruo 1120d5633b0dSQu Wenruo btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); 1121d5633b0dSQu Wenruo 1122d5633b0dSQu Wenruo /* 1123d5633b0dSQu Wenruo * We may go one slot back to INODE_REF/XATTR item, then 1124d5633b0dSQu Wenruo * need to go forward until we reach an EXTENT_DATA. 1125d5633b0dSQu Wenruo * But we should still has the correct ino as key.objectid. 1126d5633b0dSQu Wenruo */ 1127d5633b0dSQu Wenruo if (WARN_ON(key.objectid < ino) || key.type < BTRFS_EXTENT_DATA_KEY) 1128d5633b0dSQu Wenruo goto next; 1129d5633b0dSQu Wenruo 1130d5633b0dSQu Wenruo /* It's beyond our target range, definitely not extent found */ 1131d5633b0dSQu Wenruo if (key.objectid > ino || key.type > BTRFS_EXTENT_DATA_KEY) 1132d5633b0dSQu Wenruo goto not_found; 1133d5633b0dSQu Wenruo 1134d5633b0dSQu Wenruo /* 1135d5633b0dSQu Wenruo * | |<- File extent ->| 1136d5633b0dSQu Wenruo * \- start 1137d5633b0dSQu Wenruo * 1138d5633b0dSQu Wenruo * This means there is a hole between start and key.offset. 1139d5633b0dSQu Wenruo */ 1140d5633b0dSQu Wenruo if (key.offset > start) { 1141d5633b0dSQu Wenruo em->start = start; 1142d5633b0dSQu Wenruo em->orig_start = start; 1143d5633b0dSQu Wenruo em->block_start = EXTENT_MAP_HOLE; 1144d5633b0dSQu Wenruo em->len = key.offset - start; 1145d5633b0dSQu Wenruo break; 1146d5633b0dSQu Wenruo } 1147d5633b0dSQu Wenruo 1148d5633b0dSQu Wenruo fi = btrfs_item_ptr(path.nodes[0], path.slots[0], 1149d5633b0dSQu Wenruo struct btrfs_file_extent_item); 1150d5633b0dSQu Wenruo extent_end = btrfs_file_extent_end(&path); 1151d5633b0dSQu Wenruo 1152d5633b0dSQu Wenruo /* 1153d5633b0dSQu Wenruo * |<- file extent ->| | 1154d5633b0dSQu Wenruo * \- start 1155d5633b0dSQu Wenruo * 1156d5633b0dSQu Wenruo * We haven't reached start, search next slot. 1157d5633b0dSQu Wenruo */ 1158d5633b0dSQu Wenruo if (extent_end <= start) 1159d5633b0dSQu Wenruo goto next; 1160d5633b0dSQu Wenruo 1161d5633b0dSQu Wenruo /* Now this extent covers @start, convert it to em */ 1162d5633b0dSQu Wenruo btrfs_extent_item_to_extent_map(inode, &path, fi, false, em); 1163d5633b0dSQu Wenruo break; 1164d5633b0dSQu Wenruo next: 1165d5633b0dSQu Wenruo ret = btrfs_next_item(root, &path); 1166d5633b0dSQu Wenruo if (ret < 0) 1167d5633b0dSQu Wenruo goto err; 1168d5633b0dSQu Wenruo if (ret > 0) 1169d5633b0dSQu Wenruo goto not_found; 1170d5633b0dSQu Wenruo } 1171d5633b0dSQu Wenruo btrfs_release_path(&path); 1172d5633b0dSQu Wenruo return em; 1173d5633b0dSQu Wenruo 1174d5633b0dSQu Wenruo not_found: 1175d5633b0dSQu Wenruo btrfs_release_path(&path); 1176d5633b0dSQu Wenruo free_extent_map(em); 1177d5633b0dSQu Wenruo return NULL; 1178d5633b0dSQu Wenruo 1179d5633b0dSQu Wenruo err: 1180d5633b0dSQu Wenruo btrfs_release_path(&path); 1181d5633b0dSQu Wenruo free_extent_map(em); 1182d5633b0dSQu Wenruo return ERR_PTR(ret); 1183d5633b0dSQu Wenruo } 1184d5633b0dSQu Wenruo 1185e9eec721SQu Wenruo static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start, 1186d5633b0dSQu Wenruo u64 newer_than, bool locked) 118717ce6ef8SLiu Bo { 118817ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1189940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 11906c282eb4SLi Zefan struct extent_map *em; 119176068caeSQu Wenruo const u32 sectorsize = BTRFS_I(inode)->root->fs_info->sectorsize; 1192940100a4SChris Mason 1193940100a4SChris Mason /* 1194940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1195940100a4SChris Mason * the full extent lock 1196940100a4SChris Mason */ 1197940100a4SChris Mason read_lock(&em_tree->lock); 119876068caeSQu Wenruo em = lookup_extent_mapping(em_tree, start, sectorsize); 1199940100a4SChris Mason read_unlock(&em_tree->lock); 1200940100a4SChris Mason 1201199257a7SQu Wenruo /* 1202199257a7SQu Wenruo * We can get a merged extent, in that case, we need to re-search 1203199257a7SQu Wenruo * tree to get the original em for defrag. 1204199257a7SQu Wenruo * 1205199257a7SQu Wenruo * If @newer_than is 0 or em::generation < newer_than, we can trust 1206199257a7SQu Wenruo * this em, as either we don't care about the generation, or the 1207199257a7SQu Wenruo * merged extent map will be rejected anyway. 1208199257a7SQu Wenruo */ 1209199257a7SQu Wenruo if (em && test_bit(EXTENT_FLAG_MERGED, &em->flags) && 1210199257a7SQu Wenruo newer_than && em->generation >= newer_than) { 1211199257a7SQu Wenruo free_extent_map(em); 1212199257a7SQu Wenruo em = NULL; 1213199257a7SQu Wenruo } 1214199257a7SQu Wenruo 1215940100a4SChris Mason if (!em) { 1216308d9800SFilipe Manana struct extent_state *cached = NULL; 121776068caeSQu Wenruo u64 end = start + sectorsize - 1; 1218308d9800SFilipe Manana 1219940100a4SChris Mason /* get the big lock and read metadata off disk */ 1220e9eec721SQu Wenruo if (!locked) 1221ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 1222d5633b0dSQu Wenruo em = defrag_get_extent(BTRFS_I(inode), start, newer_than); 1223e9eec721SQu Wenruo if (!locked) 1224e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1225940100a4SChris Mason 12266cf8bfbfSDan Carpenter if (IS_ERR(em)) 12276c282eb4SLi Zefan return NULL; 1228940100a4SChris Mason } 1229940100a4SChris Mason 12306c282eb4SLi Zefan return em; 12316c282eb4SLi Zefan } 12326c282eb4SLi Zefan 1233979b25c3SQu Wenruo static u32 get_extent_max_capacity(const struct extent_map *em) 1234979b25c3SQu Wenruo { 1235979b25c3SQu Wenruo if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) 1236979b25c3SQu Wenruo return BTRFS_MAX_COMPRESSED; 1237979b25c3SQu Wenruo return BTRFS_MAX_EXTENT_SIZE; 1238979b25c3SQu Wenruo } 1239979b25c3SQu Wenruo 1240e9eec721SQu Wenruo static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em, 124175a36a7dSQu Wenruo u32 extent_thresh, u64 newer_than, bool locked) 12426c282eb4SLi Zefan { 12436c282eb4SLi Zefan struct extent_map *next; 12447093f152SQu Wenruo bool ret = false; 12456c282eb4SLi Zefan 12466c282eb4SLi Zefan /* this is the last extent */ 12476c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 12486c282eb4SLi Zefan return false; 12496c282eb4SLi Zefan 1250d5633b0dSQu Wenruo /* 125175a36a7dSQu Wenruo * Here we need to pass @newer_then when checking the next extent, or 125275a36a7dSQu Wenruo * we will hit a case we mark current extent for defrag, but the next 125375a36a7dSQu Wenruo * one will not be a target. 125475a36a7dSQu Wenruo * This will just cause extra IO without really reducing the fragments. 1255d5633b0dSQu Wenruo */ 125675a36a7dSQu Wenruo next = defrag_lookup_extent(inode, em->start + em->len, newer_than, locked); 12577093f152SQu Wenruo /* No more em or hole */ 1258e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 12597093f152SQu Wenruo goto out; 12607093f152SQu Wenruo if (test_bit(EXTENT_FLAG_PREALLOC, &next->flags)) 12617093f152SQu Wenruo goto out; 1262979b25c3SQu Wenruo /* 1263979b25c3SQu Wenruo * If the next extent is at its max capacity, defragging current extent 1264979b25c3SQu Wenruo * makes no sense, as the total number of extents won't change. 1265979b25c3SQu Wenruo */ 1266979b25c3SQu Wenruo if (next->len >= get_extent_max_capacity(em)) 1267979b25c3SQu Wenruo goto out; 126875a36a7dSQu Wenruo /* Skip older extent */ 126975a36a7dSQu Wenruo if (next->generation < newer_than) 127075a36a7dSQu Wenruo goto out; 127175a36a7dSQu Wenruo /* Also check extent size */ 127275a36a7dSQu Wenruo if (next->len >= extent_thresh) 127375a36a7dSQu Wenruo goto out; 127475a36a7dSQu Wenruo 12757093f152SQu Wenruo ret = true; 12767093f152SQu Wenruo out: 12776c282eb4SLi Zefan free_extent_map(next); 12786c282eb4SLi Zefan return ret; 12796c282eb4SLi Zefan } 12806c282eb4SLi Zefan 12814cb5300bSChris Mason /* 12825767b50cSQu Wenruo * Prepare one page to be defragged. 12835767b50cSQu Wenruo * 12845767b50cSQu Wenruo * This will ensure: 12855767b50cSQu Wenruo * 12865767b50cSQu Wenruo * - Returned page is locked and has been set up properly. 12875767b50cSQu Wenruo * - No ordered extent exists in the page. 12885767b50cSQu Wenruo * - The page is uptodate. 12895767b50cSQu Wenruo * 12905767b50cSQu Wenruo * NOTE: Caller should also wait for page writeback after the cluster is 12915767b50cSQu Wenruo * prepared, here we don't do writeback wait for each page. 12925767b50cSQu Wenruo */ 12935767b50cSQu Wenruo static struct page *defrag_prepare_one_page(struct btrfs_inode *inode, 12945767b50cSQu Wenruo pgoff_t index) 1295940100a4SChris Mason { 12965767b50cSQu Wenruo struct address_space *mapping = inode->vfs_inode.i_mapping; 12975767b50cSQu Wenruo gfp_t mask = btrfs_alloc_write_mask(mapping); 12985767b50cSQu Wenruo u64 page_start = (u64)index << PAGE_SHIFT; 12995767b50cSQu Wenruo u64 page_end = page_start + PAGE_SIZE - 1; 13004cb5300bSChris Mason struct extent_state *cached_state = NULL; 13014cb5300bSChris Mason struct page *page; 13025767b50cSQu Wenruo int ret; 13035767b50cSQu Wenruo 1304600a45e1SMiao Xie again: 13055767b50cSQu Wenruo page = find_or_create_page(mapping, index, mask); 13064cb5300bSChris Mason if (!page) 13075767b50cSQu Wenruo return ERR_PTR(-ENOMEM); 13085767b50cSQu Wenruo 130924bcb454SOmar Sandoval /* 131024bcb454SOmar Sandoval * Since we can defragment files opened read-only, we can encounter 131124bcb454SOmar Sandoval * transparent huge pages here (see CONFIG_READ_ONLY_THP_FOR_FS). We 131224bcb454SOmar Sandoval * can't do I/O using huge pages yet, so return an error for now. 131324bcb454SOmar Sandoval * Filesystem transparent huge pages are typically only used for 131424bcb454SOmar Sandoval * executables that explicitly enable them, so this isn't very 131524bcb454SOmar Sandoval * restrictive. 131624bcb454SOmar Sandoval */ 131724bcb454SOmar Sandoval if (PageCompound(page)) { 131824bcb454SOmar Sandoval unlock_page(page); 131924bcb454SOmar Sandoval put_page(page); 132024bcb454SOmar Sandoval return ERR_PTR(-ETXTBSY); 132124bcb454SOmar Sandoval } 13224cb5300bSChris Mason 132332443de3SQu Wenruo ret = set_page_extent_mapped(page); 132432443de3SQu Wenruo if (ret < 0) { 132532443de3SQu Wenruo unlock_page(page); 132632443de3SQu Wenruo put_page(page); 13275767b50cSQu Wenruo return ERR_PTR(ret); 132832443de3SQu Wenruo } 132932443de3SQu Wenruo 13305767b50cSQu Wenruo /* Wait for any existing ordered extent in the range */ 1331600a45e1SMiao Xie while (1) { 13325767b50cSQu Wenruo struct btrfs_ordered_extent *ordered; 13335767b50cSQu Wenruo 13345767b50cSQu Wenruo lock_extent_bits(&inode->io_tree, page_start, page_end, &cached_state); 13355767b50cSQu Wenruo ordered = btrfs_lookup_ordered_range(inode, page_start, PAGE_SIZE); 13365767b50cSQu Wenruo unlock_extent_cached(&inode->io_tree, page_start, page_end, 1337e43bbe5eSDavid Sterba &cached_state); 1338600a45e1SMiao Xie if (!ordered) 1339600a45e1SMiao Xie break; 1340600a45e1SMiao Xie 1341600a45e1SMiao Xie unlock_page(page); 1342c0a43603SNikolay Borisov btrfs_start_ordered_extent(ordered, 1); 1343600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1344600a45e1SMiao Xie lock_page(page); 13451f12bd06SLiu Bo /* 13465767b50cSQu Wenruo * We unlocked the page above, so we need check if it was 13475767b50cSQu Wenruo * released or not. 13481f12bd06SLiu Bo */ 13495767b50cSQu Wenruo if (page->mapping != mapping || !PagePrivate(page)) { 13501f12bd06SLiu Bo unlock_page(page); 135109cbfeafSKirill A. Shutemov put_page(page); 13521f12bd06SLiu Bo goto again; 13531f12bd06SLiu Bo } 1354600a45e1SMiao Xie } 1355600a45e1SMiao Xie 13565767b50cSQu Wenruo /* 13575767b50cSQu Wenruo * Now the page range has no ordered extent any more. Read the page to 13585767b50cSQu Wenruo * make it uptodate. 13595767b50cSQu Wenruo */ 13604cb5300bSChris Mason if (!PageUptodate(page)) { 1361fb12489bSMatthew Wilcox (Oracle) btrfs_read_folio(NULL, page_folio(page)); 13624cb5300bSChris Mason lock_page(page); 13635767b50cSQu Wenruo if (page->mapping != mapping || !PagePrivate(page)) { 1364600a45e1SMiao Xie unlock_page(page); 136509cbfeafSKirill A. Shutemov put_page(page); 1366600a45e1SMiao Xie goto again; 1367600a45e1SMiao Xie } 13685767b50cSQu Wenruo if (!PageUptodate(page)) { 13695767b50cSQu Wenruo unlock_page(page); 13705767b50cSQu Wenruo put_page(page); 13715767b50cSQu Wenruo return ERR_PTR(-EIO); 13724cb5300bSChris Mason } 13735767b50cSQu Wenruo } 13745767b50cSQu Wenruo return page; 13755767b50cSQu Wenruo } 13764cb5300bSChris Mason 1377eb793cf8SQu Wenruo struct defrag_target_range { 1378eb793cf8SQu Wenruo struct list_head list; 1379eb793cf8SQu Wenruo u64 start; 1380eb793cf8SQu Wenruo u64 len; 1381eb793cf8SQu Wenruo }; 13824cb5300bSChris Mason 13834cb5300bSChris Mason /* 1384eb793cf8SQu Wenruo * Collect all valid target extents. 1385eb793cf8SQu Wenruo * 1386eb793cf8SQu Wenruo * @start: file offset to lookup 1387eb793cf8SQu Wenruo * @len: length to lookup 1388eb793cf8SQu Wenruo * @extent_thresh: file extent size threshold, any extent size >= this value 1389eb793cf8SQu Wenruo * will be ignored 1390eb793cf8SQu Wenruo * @newer_than: only defrag extents newer than this value 1391eb793cf8SQu Wenruo * @do_compress: whether the defrag is doing compression 1392eb793cf8SQu Wenruo * if true, @extent_thresh will be ignored and all regular 1393eb793cf8SQu Wenruo * file extents meeting @newer_than will be targets. 1394e9eec721SQu Wenruo * @locked: if the range has already held extent lock 1395eb793cf8SQu Wenruo * @target_list: list of targets file extents 13964cb5300bSChris Mason */ 1397eb793cf8SQu Wenruo static int defrag_collect_targets(struct btrfs_inode *inode, 1398eb793cf8SQu Wenruo u64 start, u64 len, u32 extent_thresh, 1399eb793cf8SQu Wenruo u64 newer_than, bool do_compress, 1400966d879bSQu Wenruo bool locked, struct list_head *target_list, 1401966d879bSQu Wenruo u64 *last_scanned_ret) 1402eb793cf8SQu Wenruo { 1403966d879bSQu Wenruo bool last_is_target = false; 1404eb793cf8SQu Wenruo u64 cur = start; 1405eb793cf8SQu Wenruo int ret = 0; 1406eb793cf8SQu Wenruo 1407eb793cf8SQu Wenruo while (cur < start + len) { 1408eb793cf8SQu Wenruo struct extent_map *em; 1409eb793cf8SQu Wenruo struct defrag_target_range *new; 1410eb793cf8SQu Wenruo bool next_mergeable = true; 1411eb793cf8SQu Wenruo u64 range_len; 1412eb793cf8SQu Wenruo 1413966d879bSQu Wenruo last_is_target = false; 1414d5633b0dSQu Wenruo em = defrag_lookup_extent(&inode->vfs_inode, cur, 1415d5633b0dSQu Wenruo newer_than, locked); 1416eb793cf8SQu Wenruo if (!em) 1417eb793cf8SQu Wenruo break; 1418eb793cf8SQu Wenruo 1419d8101a0cSQu Wenruo /* 1420d8101a0cSQu Wenruo * If the file extent is an inlined one, we may still want to 1421d8101a0cSQu Wenruo * defrag it (fallthrough) if it will cause a regular extent. 1422d8101a0cSQu Wenruo * This is for users who want to convert inline extents to 1423d8101a0cSQu Wenruo * regular ones through max_inline= mount option. 1424d8101a0cSQu Wenruo */ 1425d8101a0cSQu Wenruo if (em->block_start == EXTENT_MAP_INLINE && 1426d8101a0cSQu Wenruo em->len <= inode->root->fs_info->max_inline) 1427d8101a0cSQu Wenruo goto next; 1428d8101a0cSQu Wenruo 1429d8101a0cSQu Wenruo /* Skip hole/delalloc/preallocated extents */ 1430d8101a0cSQu Wenruo if (em->block_start == EXTENT_MAP_HOLE || 1431d8101a0cSQu Wenruo em->block_start == EXTENT_MAP_DELALLOC || 1432eb793cf8SQu Wenruo test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) 1433eb793cf8SQu Wenruo goto next; 1434eb793cf8SQu Wenruo 1435eb793cf8SQu Wenruo /* Skip older extent */ 1436eb793cf8SQu Wenruo if (em->generation < newer_than) 1437eb793cf8SQu Wenruo goto next; 1438eb793cf8SQu Wenruo 14390d1ffa22SQu Wenruo /* This em is under writeback, no need to defrag */ 14400d1ffa22SQu Wenruo if (em->generation == (u64)-1) 14410d1ffa22SQu Wenruo goto next; 14420d1ffa22SQu Wenruo 1443eb793cf8SQu Wenruo /* 14440cb5950fSFilipe Manana * Our start offset might be in the middle of an existing extent 14450cb5950fSFilipe Manana * map, so take that into account. 14460cb5950fSFilipe Manana */ 14470cb5950fSFilipe Manana range_len = em->len - (cur - em->start); 14480cb5950fSFilipe Manana /* 14490cb5950fSFilipe Manana * If this range of the extent map is already flagged for delalloc, 14500cb5950fSFilipe Manana * skip it, because: 14510cb5950fSFilipe Manana * 14520cb5950fSFilipe Manana * 1) We could deadlock later, when trying to reserve space for 14530cb5950fSFilipe Manana * delalloc, because in case we can't immediately reserve space 14540cb5950fSFilipe Manana * the flusher can start delalloc and wait for the respective 14550cb5950fSFilipe Manana * ordered extents to complete. The deadlock would happen 14560cb5950fSFilipe Manana * because we do the space reservation while holding the range 14570cb5950fSFilipe Manana * locked, and starting writeback, or finishing an ordered 14580cb5950fSFilipe Manana * extent, requires locking the range; 14590cb5950fSFilipe Manana * 14600cb5950fSFilipe Manana * 2) If there's delalloc there, it means there's dirty pages for 14610cb5950fSFilipe Manana * which writeback has not started yet (we clean the delalloc 14620cb5950fSFilipe Manana * flag when starting writeback and after creating an ordered 14630cb5950fSFilipe Manana * extent). If we mark pages in an adjacent range for defrag, 14640cb5950fSFilipe Manana * then we will have a larger contiguous range for delalloc, 14650cb5950fSFilipe Manana * very likely resulting in a larger extent after writeback is 14660cb5950fSFilipe Manana * triggered (except in a case of free space fragmentation). 14670cb5950fSFilipe Manana */ 14680cb5950fSFilipe Manana if (test_range_bit(&inode->io_tree, cur, cur + range_len - 1, 14690cb5950fSFilipe Manana EXTENT_DELALLOC, 0, NULL)) 14700cb5950fSFilipe Manana goto next; 14710cb5950fSFilipe Manana 14720cb5950fSFilipe Manana /* 1473eb793cf8SQu Wenruo * For do_compress case, we want to compress all valid file 1474eb793cf8SQu Wenruo * extents, thus no @extent_thresh or mergeable check. 1475eb793cf8SQu Wenruo */ 1476eb793cf8SQu Wenruo if (do_compress) 1477eb793cf8SQu Wenruo goto add; 1478eb793cf8SQu Wenruo 1479eb793cf8SQu Wenruo /* Skip too large extent */ 14800cb5950fSFilipe Manana if (range_len >= extent_thresh) 1481eb793cf8SQu Wenruo goto next; 1482eb793cf8SQu Wenruo 1483979b25c3SQu Wenruo /* 1484979b25c3SQu Wenruo * Skip extents already at its max capacity, this is mostly for 1485979b25c3SQu Wenruo * compressed extents, which max cap is only 128K. 1486979b25c3SQu Wenruo */ 1487979b25c3SQu Wenruo if (em->len >= get_extent_max_capacity(em)) 1488979b25c3SQu Wenruo goto next; 1489979b25c3SQu Wenruo 1490d8101a0cSQu Wenruo /* 1491d8101a0cSQu Wenruo * Normally there are no more extents after an inline one, thus 1492d8101a0cSQu Wenruo * @next_mergeable will normally be false and not defragged. 1493d8101a0cSQu Wenruo * So if an inline extent passed all above checks, just add it 1494d8101a0cSQu Wenruo * for defrag, and be converted to regular extents. 1495d8101a0cSQu Wenruo */ 1496d8101a0cSQu Wenruo if (em->block_start == EXTENT_MAP_INLINE) 1497d8101a0cSQu Wenruo goto add; 1498d8101a0cSQu Wenruo 1499e9eec721SQu Wenruo next_mergeable = defrag_check_next_extent(&inode->vfs_inode, em, 150075a36a7dSQu Wenruo extent_thresh, newer_than, locked); 1501eb793cf8SQu Wenruo if (!next_mergeable) { 1502eb793cf8SQu Wenruo struct defrag_target_range *last; 1503eb793cf8SQu Wenruo 1504eb793cf8SQu Wenruo /* Empty target list, no way to merge with last entry */ 1505eb793cf8SQu Wenruo if (list_empty(target_list)) 1506eb793cf8SQu Wenruo goto next; 1507eb793cf8SQu Wenruo last = list_entry(target_list->prev, 1508eb793cf8SQu Wenruo struct defrag_target_range, list); 1509eb793cf8SQu Wenruo /* Not mergeable with last entry */ 1510eb793cf8SQu Wenruo if (last->start + last->len != cur) 1511eb793cf8SQu Wenruo goto next; 1512eb793cf8SQu Wenruo 1513eb793cf8SQu Wenruo /* Mergeable, fall through to add it to @target_list. */ 1514eb793cf8SQu Wenruo } 1515eb793cf8SQu Wenruo 1516eb793cf8SQu Wenruo add: 1517966d879bSQu Wenruo last_is_target = true; 1518eb793cf8SQu Wenruo range_len = min(extent_map_end(em), start + len) - cur; 1519eb793cf8SQu Wenruo /* 1520eb793cf8SQu Wenruo * This one is a good target, check if it can be merged into 1521eb793cf8SQu Wenruo * last range of the target list. 1522eb793cf8SQu Wenruo */ 1523eb793cf8SQu Wenruo if (!list_empty(target_list)) { 1524eb793cf8SQu Wenruo struct defrag_target_range *last; 1525eb793cf8SQu Wenruo 1526eb793cf8SQu Wenruo last = list_entry(target_list->prev, 1527eb793cf8SQu Wenruo struct defrag_target_range, list); 1528eb793cf8SQu Wenruo ASSERT(last->start + last->len <= cur); 1529eb793cf8SQu Wenruo if (last->start + last->len == cur) { 1530eb793cf8SQu Wenruo /* Mergeable, enlarge the last entry */ 1531eb793cf8SQu Wenruo last->len += range_len; 1532eb793cf8SQu Wenruo goto next; 1533eb793cf8SQu Wenruo } 1534eb793cf8SQu Wenruo /* Fall through to allocate a new entry */ 1535eb793cf8SQu Wenruo } 1536eb793cf8SQu Wenruo 1537eb793cf8SQu Wenruo /* Allocate new defrag_target_range */ 1538eb793cf8SQu Wenruo new = kmalloc(sizeof(*new), GFP_NOFS); 1539eb793cf8SQu Wenruo if (!new) { 1540eb793cf8SQu Wenruo free_extent_map(em); 1541eb793cf8SQu Wenruo ret = -ENOMEM; 1542eb793cf8SQu Wenruo break; 1543eb793cf8SQu Wenruo } 1544eb793cf8SQu Wenruo new->start = cur; 1545eb793cf8SQu Wenruo new->len = range_len; 1546eb793cf8SQu Wenruo list_add_tail(&new->list, target_list); 1547eb793cf8SQu Wenruo 1548eb793cf8SQu Wenruo next: 1549eb793cf8SQu Wenruo cur = extent_map_end(em); 1550eb793cf8SQu Wenruo free_extent_map(em); 1551eb793cf8SQu Wenruo } 1552eb793cf8SQu Wenruo if (ret < 0) { 1553eb793cf8SQu Wenruo struct defrag_target_range *entry; 1554eb793cf8SQu Wenruo struct defrag_target_range *tmp; 1555eb793cf8SQu Wenruo 1556eb793cf8SQu Wenruo list_for_each_entry_safe(entry, tmp, target_list, list) { 1557eb793cf8SQu Wenruo list_del_init(&entry->list); 1558eb793cf8SQu Wenruo kfree(entry); 1559eb793cf8SQu Wenruo } 1560eb793cf8SQu Wenruo } 1561966d879bSQu Wenruo if (!ret && last_scanned_ret) { 1562966d879bSQu Wenruo /* 1563966d879bSQu Wenruo * If the last extent is not a target, the caller can skip to 1564966d879bSQu Wenruo * the end of that extent. 1565966d879bSQu Wenruo * Otherwise, we can only go the end of the specified range. 1566966d879bSQu Wenruo */ 1567966d879bSQu Wenruo if (!last_is_target) 1568966d879bSQu Wenruo *last_scanned_ret = max(cur, *last_scanned_ret); 1569966d879bSQu Wenruo else 1570966d879bSQu Wenruo *last_scanned_ret = max(start + len, *last_scanned_ret); 1571966d879bSQu Wenruo } 1572eb793cf8SQu Wenruo return ret; 1573eb793cf8SQu Wenruo } 1574eb793cf8SQu Wenruo 157522b398eeSQu Wenruo #define CLUSTER_SIZE (SZ_256K) 1576a55e65b8SDavid Sterba static_assert(IS_ALIGNED(CLUSTER_SIZE, PAGE_SIZE)); 157722b398eeSQu Wenruo 157822b398eeSQu Wenruo /* 157922b398eeSQu Wenruo * Defrag one contiguous target range. 158022b398eeSQu Wenruo * 158122b398eeSQu Wenruo * @inode: target inode 158222b398eeSQu Wenruo * @target: target range to defrag 158322b398eeSQu Wenruo * @pages: locked pages covering the defrag range 158422b398eeSQu Wenruo * @nr_pages: number of locked pages 158522b398eeSQu Wenruo * 158622b398eeSQu Wenruo * Caller should ensure: 158722b398eeSQu Wenruo * 158822b398eeSQu Wenruo * - Pages are prepared 158922b398eeSQu Wenruo * Pages should be locked, no ordered extent in the pages range, 159022b398eeSQu Wenruo * no writeback. 159122b398eeSQu Wenruo * 159222b398eeSQu Wenruo * - Extent bits are locked 159322b398eeSQu Wenruo */ 159422b398eeSQu Wenruo static int defrag_one_locked_target(struct btrfs_inode *inode, 159522b398eeSQu Wenruo struct defrag_target_range *target, 159622b398eeSQu Wenruo struct page **pages, int nr_pages, 159722b398eeSQu Wenruo struct extent_state **cached_state) 159822b398eeSQu Wenruo { 159922b398eeSQu Wenruo struct btrfs_fs_info *fs_info = inode->root->fs_info; 160022b398eeSQu Wenruo struct extent_changeset *data_reserved = NULL; 160122b398eeSQu Wenruo const u64 start = target->start; 160222b398eeSQu Wenruo const u64 len = target->len; 160322b398eeSQu Wenruo unsigned long last_index = (start + len - 1) >> PAGE_SHIFT; 160422b398eeSQu Wenruo unsigned long start_index = start >> PAGE_SHIFT; 160522b398eeSQu Wenruo unsigned long first_index = page_index(pages[0]); 160622b398eeSQu Wenruo int ret = 0; 160722b398eeSQu Wenruo int i; 160822b398eeSQu Wenruo 160922b398eeSQu Wenruo ASSERT(last_index - first_index + 1 <= nr_pages); 161022b398eeSQu Wenruo 161122b398eeSQu Wenruo ret = btrfs_delalloc_reserve_space(inode, &data_reserved, start, len); 161222b398eeSQu Wenruo if (ret < 0) 161322b398eeSQu Wenruo return ret; 161422b398eeSQu Wenruo clear_extent_bit(&inode->io_tree, start, start + len - 1, 161522b398eeSQu Wenruo EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 161622b398eeSQu Wenruo EXTENT_DEFRAG, 0, 0, cached_state); 161722b398eeSQu Wenruo set_extent_defrag(&inode->io_tree, start, start + len - 1, cached_state); 161822b398eeSQu Wenruo 161922b398eeSQu Wenruo /* Update the page status */ 162022b398eeSQu Wenruo for (i = start_index - first_index; i <= last_index - first_index; i++) { 162122b398eeSQu Wenruo ClearPageChecked(pages[i]); 162222b398eeSQu Wenruo btrfs_page_clamp_set_dirty(fs_info, pages[i], start, len); 162322b398eeSQu Wenruo } 162422b398eeSQu Wenruo btrfs_delalloc_release_extents(inode, len); 162522b398eeSQu Wenruo extent_changeset_free(data_reserved); 162622b398eeSQu Wenruo 162722b398eeSQu Wenruo return ret; 162822b398eeSQu Wenruo } 162922b398eeSQu Wenruo 1630e9eec721SQu Wenruo static int defrag_one_range(struct btrfs_inode *inode, u64 start, u32 len, 1631966d879bSQu Wenruo u32 extent_thresh, u64 newer_than, bool do_compress, 1632966d879bSQu Wenruo u64 *last_scanned_ret) 1633e9eec721SQu Wenruo { 1634e9eec721SQu Wenruo struct extent_state *cached_state = NULL; 1635e9eec721SQu Wenruo struct defrag_target_range *entry; 1636e9eec721SQu Wenruo struct defrag_target_range *tmp; 1637e9eec721SQu Wenruo LIST_HEAD(target_list); 1638e9eec721SQu Wenruo struct page **pages; 1639e9eec721SQu Wenruo const u32 sectorsize = inode->root->fs_info->sectorsize; 1640e9eec721SQu Wenruo u64 last_index = (start + len - 1) >> PAGE_SHIFT; 1641e9eec721SQu Wenruo u64 start_index = start >> PAGE_SHIFT; 1642e9eec721SQu Wenruo unsigned int nr_pages = last_index - start_index + 1; 1643e9eec721SQu Wenruo int ret = 0; 1644e9eec721SQu Wenruo int i; 1645e9eec721SQu Wenruo 1646e9eec721SQu Wenruo ASSERT(nr_pages <= CLUSTER_SIZE / PAGE_SIZE); 1647e9eec721SQu Wenruo ASSERT(IS_ALIGNED(start, sectorsize) && IS_ALIGNED(len, sectorsize)); 1648e9eec721SQu Wenruo 1649e9eec721SQu Wenruo pages = kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS); 1650e9eec721SQu Wenruo if (!pages) 1651e9eec721SQu Wenruo return -ENOMEM; 1652e9eec721SQu Wenruo 1653e9eec721SQu Wenruo /* Prepare all pages */ 1654e9eec721SQu Wenruo for (i = 0; i < nr_pages; i++) { 1655e9eec721SQu Wenruo pages[i] = defrag_prepare_one_page(inode, start_index + i); 1656e9eec721SQu Wenruo if (IS_ERR(pages[i])) { 1657e9eec721SQu Wenruo ret = PTR_ERR(pages[i]); 1658e9eec721SQu Wenruo pages[i] = NULL; 1659e9eec721SQu Wenruo goto free_pages; 1660e9eec721SQu Wenruo } 1661e9eec721SQu Wenruo } 1662e9eec721SQu Wenruo for (i = 0; i < nr_pages; i++) 16634cb5300bSChris Mason wait_on_page_writeback(pages[i]); 16644cb5300bSChris Mason 1665e9eec721SQu Wenruo /* Lock the pages range */ 1666e9eec721SQu Wenruo lock_extent_bits(&inode->io_tree, start_index << PAGE_SHIFT, 1667e9eec721SQu Wenruo (last_index << PAGE_SHIFT) + PAGE_SIZE - 1, 1668e9eec721SQu Wenruo &cached_state); 1669e9eec721SQu Wenruo /* 1670e9eec721SQu Wenruo * Now we have a consistent view about the extent map, re-check 1671e9eec721SQu Wenruo * which range really needs to be defragged. 1672e9eec721SQu Wenruo * 1673e9eec721SQu Wenruo * And this time we have extent locked already, pass @locked = true 1674e9eec721SQu Wenruo * so that we won't relock the extent range and cause deadlock. 1675e9eec721SQu Wenruo */ 1676e9eec721SQu Wenruo ret = defrag_collect_targets(inode, start, len, extent_thresh, 1677e9eec721SQu Wenruo newer_than, do_compress, true, 1678966d879bSQu Wenruo &target_list, last_scanned_ret); 1679e9eec721SQu Wenruo if (ret < 0) 1680e9eec721SQu Wenruo goto unlock_extent; 16814cb5300bSChris Mason 1682e9eec721SQu Wenruo list_for_each_entry(entry, &target_list, list) { 1683e9eec721SQu Wenruo ret = defrag_one_locked_target(inode, entry, pages, nr_pages, 1684e9eec721SQu Wenruo &cached_state); 1685e9eec721SQu Wenruo if (ret < 0) 1686e9eec721SQu Wenruo break; 1687e9eec721SQu Wenruo } 1688e9eec721SQu Wenruo 1689e9eec721SQu Wenruo list_for_each_entry_safe(entry, tmp, &target_list, list) { 1690e9eec721SQu Wenruo list_del_init(&entry->list); 1691e9eec721SQu Wenruo kfree(entry); 1692e9eec721SQu Wenruo } 1693e9eec721SQu Wenruo unlock_extent: 1694e9eec721SQu Wenruo unlock_extent_cached(&inode->io_tree, start_index << PAGE_SHIFT, 1695e9eec721SQu Wenruo (last_index << PAGE_SHIFT) + PAGE_SIZE - 1, 1696e9eec721SQu Wenruo &cached_state); 1697e9eec721SQu Wenruo free_pages: 1698e9eec721SQu Wenruo for (i = 0; i < nr_pages; i++) { 1699e9eec721SQu Wenruo if (pages[i]) { 1700e9eec721SQu Wenruo unlock_page(pages[i]); 1701e9eec721SQu Wenruo put_page(pages[i]); 1702e9eec721SQu Wenruo } 1703e9eec721SQu Wenruo } 1704e9eec721SQu Wenruo kfree(pages); 1705e9eec721SQu Wenruo return ret; 1706e9eec721SQu Wenruo } 1707e9eec721SQu Wenruo 1708b18c3ab2SQu Wenruo static int defrag_one_cluster(struct btrfs_inode *inode, 1709b18c3ab2SQu Wenruo struct file_ra_state *ra, 1710b18c3ab2SQu Wenruo u64 start, u32 len, u32 extent_thresh, 1711b18c3ab2SQu Wenruo u64 newer_than, bool do_compress, 1712b18c3ab2SQu Wenruo unsigned long *sectors_defragged, 1713966d879bSQu Wenruo unsigned long max_sectors, 1714966d879bSQu Wenruo u64 *last_scanned_ret) 1715b18c3ab2SQu Wenruo { 1716b18c3ab2SQu Wenruo const u32 sectorsize = inode->root->fs_info->sectorsize; 1717b18c3ab2SQu Wenruo struct defrag_target_range *entry; 1718b18c3ab2SQu Wenruo struct defrag_target_range *tmp; 1719b18c3ab2SQu Wenruo LIST_HEAD(target_list); 1720b18c3ab2SQu Wenruo int ret; 1721b18c3ab2SQu Wenruo 1722b18c3ab2SQu Wenruo ret = defrag_collect_targets(inode, start, len, extent_thresh, 1723b18c3ab2SQu Wenruo newer_than, do_compress, false, 1724966d879bSQu Wenruo &target_list, NULL); 1725b18c3ab2SQu Wenruo if (ret < 0) 1726b18c3ab2SQu Wenruo goto out; 1727b18c3ab2SQu Wenruo 1728b18c3ab2SQu Wenruo list_for_each_entry(entry, &target_list, list) { 1729b18c3ab2SQu Wenruo u32 range_len = entry->len; 1730b18c3ab2SQu Wenruo 1731484167daSQu Wenruo /* Reached or beyond the limit */ 1732c080b414SQu Wenruo if (max_sectors && *sectors_defragged >= max_sectors) { 1733c080b414SQu Wenruo ret = 1; 1734b18c3ab2SQu Wenruo break; 1735c080b414SQu Wenruo } 1736b18c3ab2SQu Wenruo 1737b18c3ab2SQu Wenruo if (max_sectors) 1738b18c3ab2SQu Wenruo range_len = min_t(u32, range_len, 1739b18c3ab2SQu Wenruo (max_sectors - *sectors_defragged) * sectorsize); 1740b18c3ab2SQu Wenruo 1741966d879bSQu Wenruo /* 1742966d879bSQu Wenruo * If defrag_one_range() has updated last_scanned_ret, 1743966d879bSQu Wenruo * our range may already be invalid (e.g. hole punched). 1744966d879bSQu Wenruo * Skip if our range is before last_scanned_ret, as there is 1745966d879bSQu Wenruo * no need to defrag the range anymore. 1746966d879bSQu Wenruo */ 1747966d879bSQu Wenruo if (entry->start + range_len <= *last_scanned_ret) 1748966d879bSQu Wenruo continue; 1749966d879bSQu Wenruo 1750b18c3ab2SQu Wenruo if (ra) 1751b18c3ab2SQu Wenruo page_cache_sync_readahead(inode->vfs_inode.i_mapping, 1752b18c3ab2SQu Wenruo ra, NULL, entry->start >> PAGE_SHIFT, 1753b18c3ab2SQu Wenruo ((entry->start + range_len - 1) >> PAGE_SHIFT) - 1754b18c3ab2SQu Wenruo (entry->start >> PAGE_SHIFT) + 1); 1755b18c3ab2SQu Wenruo /* 1756b18c3ab2SQu Wenruo * Here we may not defrag any range if holes are punched before 1757b18c3ab2SQu Wenruo * we locked the pages. 1758b18c3ab2SQu Wenruo * But that's fine, it only affects the @sectors_defragged 1759b18c3ab2SQu Wenruo * accounting. 1760b18c3ab2SQu Wenruo */ 1761b18c3ab2SQu Wenruo ret = defrag_one_range(inode, entry->start, range_len, 1762966d879bSQu Wenruo extent_thresh, newer_than, do_compress, 1763966d879bSQu Wenruo last_scanned_ret); 1764b18c3ab2SQu Wenruo if (ret < 0) 1765b18c3ab2SQu Wenruo break; 1766484167daSQu Wenruo *sectors_defragged += range_len >> 1767484167daSQu Wenruo inode->root->fs_info->sectorsize_bits; 1768b18c3ab2SQu Wenruo } 1769b18c3ab2SQu Wenruo out: 1770b18c3ab2SQu Wenruo list_for_each_entry_safe(entry, tmp, &target_list, list) { 1771b18c3ab2SQu Wenruo list_del_init(&entry->list); 1772b18c3ab2SQu Wenruo kfree(entry); 1773b18c3ab2SQu Wenruo } 1774966d879bSQu Wenruo if (ret >= 0) 1775966d879bSQu Wenruo *last_scanned_ret = max(*last_scanned_ret, start + len); 1776b18c3ab2SQu Wenruo return ret; 1777b18c3ab2SQu Wenruo } 17787f458a38SFilipe Manana 17797f458a38SFilipe Manana /* 17801ccc2e8aSQu Wenruo * Entry point to file defragmentation. 17811ccc2e8aSQu Wenruo * 17821ccc2e8aSQu Wenruo * @inode: inode to be defragged 17831ccc2e8aSQu Wenruo * @ra: readahead state (can be NUL) 17841ccc2e8aSQu Wenruo * @range: defrag options including range and flags 17851ccc2e8aSQu Wenruo * @newer_than: minimum transid to defrag 17861ccc2e8aSQu Wenruo * @max_to_defrag: max number of sectors to be defragged, if 0, the whole inode 17871ccc2e8aSQu Wenruo * will be defragged. 1788484167daSQu Wenruo * 1789484167daSQu Wenruo * Return <0 for error. 1790c080b414SQu Wenruo * Return >=0 for the number of sectors defragged, and range->start will be updated 1791c080b414SQu Wenruo * to indicate the file offset where next defrag should be started at. 1792c080b414SQu Wenruo * (Mostly for autodefrag, which sets @max_to_defrag thus we may exit early without 1793c080b414SQu Wenruo * defragging all the range). 17947f458a38SFilipe Manana */ 17951ccc2e8aSQu Wenruo int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra, 17964cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 17974cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 17984cb5300bSChris Mason { 17990b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 18007b508037SQu Wenruo unsigned long sectors_defragged = 0; 1801151a31b2SLi Zefan u64 isize = i_size_read(inode); 18027b508037SQu Wenruo u64 cur; 18037b508037SQu Wenruo u64 last_byte; 18041e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 18051ccc2e8aSQu Wenruo bool ra_allocated = false; 18067b508037SQu Wenruo int compress_type = BTRFS_COMPRESS_ZLIB; 18077b508037SQu Wenruo int ret = 0; 18087b508037SQu Wenruo u32 extent_thresh = range->extent_thresh; 180927cdfde1SFilipe Manana pgoff_t start_index; 18104cb5300bSChris Mason 18110abd5b17SLiu Bo if (isize == 0) 18120abd5b17SLiu Bo return 0; 18130abd5b17SLiu Bo 18140abd5b17SLiu Bo if (range->start >= isize) 18150abd5b17SLiu Bo return -EINVAL; 18161a419d85SLi Zefan 18171e2ef46dSDavid Sterba if (do_compress) { 1818ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 18191a419d85SLi Zefan return -EINVAL; 18201a419d85SLi Zefan if (range->compress_type) 18211a419d85SLi Zefan compress_type = range->compress_type; 18221a419d85SLi Zefan } 1823f46b5a66SChristoph Hellwig 18240abd5b17SLiu Bo if (extent_thresh == 0) 1825ee22184bSByongho Lee extent_thresh = SZ_256K; 1826f46b5a66SChristoph Hellwig 18277b508037SQu Wenruo if (range->start + range->len > range->start) { 18287b508037SQu Wenruo /* Got a specific range */ 18296b34cd8eSFilipe Manana last_byte = min(isize, range->start + range->len); 18307b508037SQu Wenruo } else { 18317b508037SQu Wenruo /* Defrag until file end */ 18326b34cd8eSFilipe Manana last_byte = isize; 18337b508037SQu Wenruo } 18347b508037SQu Wenruo 18356b34cd8eSFilipe Manana /* Align the range */ 18366b34cd8eSFilipe Manana cur = round_down(range->start, fs_info->sectorsize); 18376b34cd8eSFilipe Manana last_byte = round_up(last_byte, fs_info->sectorsize) - 1; 18386b34cd8eSFilipe Manana 18394cb5300bSChris Mason /* 18401ccc2e8aSQu Wenruo * If we were not given a ra, allocate a readahead context. As 18410a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 18420a52d108SDavid Sterba * we don't error out. 18434cb5300bSChris Mason */ 18441ccc2e8aSQu Wenruo if (!ra) { 18451ccc2e8aSQu Wenruo ra_allocated = true; 184663e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 18470a52d108SDavid Sterba if (ra) 18484cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 18494cb5300bSChris Mason } 18504cb5300bSChris Mason 185127cdfde1SFilipe Manana /* 185227cdfde1SFilipe Manana * Make writeback start from the beginning of the range, so that the 185327cdfde1SFilipe Manana * defrag range can be written sequentially. 185427cdfde1SFilipe Manana */ 185527cdfde1SFilipe Manana start_index = cur >> PAGE_SHIFT; 185627cdfde1SFilipe Manana if (start_index < inode->i_mapping->writeback_index) 185727cdfde1SFilipe Manana inode->i_mapping->writeback_index = start_index; 185827cdfde1SFilipe Manana 18597b508037SQu Wenruo while (cur < last_byte) { 18603c9d31c7SFilipe Manana const unsigned long prev_sectors_defragged = sectors_defragged; 1861966d879bSQu Wenruo u64 last_scanned = cur; 18627b508037SQu Wenruo u64 cluster_end; 18631e701a32SChris Mason 1864b767c2fcSFilipe Manana if (btrfs_defrag_cancelled(fs_info)) { 1865b767c2fcSFilipe Manana ret = -EAGAIN; 1866b767c2fcSFilipe Manana break; 1867b767c2fcSFilipe Manana } 1868b767c2fcSFilipe Manana 18697b508037SQu Wenruo /* We want the cluster end at page boundary when possible */ 18707b508037SQu Wenruo cluster_end = (((cur >> PAGE_SHIFT) + 18717b508037SQu Wenruo (SZ_256K >> PAGE_SHIFT)) << PAGE_SHIFT) - 1; 18727b508037SQu Wenruo cluster_end = min(cluster_end, last_byte); 18734cb5300bSChris Mason 187464708539SJosef Bacik btrfs_inode_lock(inode, 0); 1875eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1876eede2bf3SOmar Sandoval ret = -ETXTBSY; 18777b508037SQu Wenruo btrfs_inode_unlock(inode, 0); 18787b508037SQu Wenruo break; 18797b508037SQu Wenruo } 18807b508037SQu Wenruo if (!(inode->i_sb->s_flags & SB_ACTIVE)) { 18817b508037SQu Wenruo btrfs_inode_unlock(inode, 0); 18827b508037SQu Wenruo break; 18837b508037SQu Wenruo } 18841e2ef46dSDavid Sterba if (do_compress) 1885eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 18867b508037SQu Wenruo ret = defrag_one_cluster(BTRFS_I(inode), ra, cur, 18877b508037SQu Wenruo cluster_end + 1 - cur, extent_thresh, 1888966d879bSQu Wenruo newer_than, do_compress, §ors_defragged, 1889966d879bSQu Wenruo max_to_defrag, &last_scanned); 18903c9d31c7SFilipe Manana 18913c9d31c7SFilipe Manana if (sectors_defragged > prev_sectors_defragged) 18923c9d31c7SFilipe Manana balance_dirty_pages_ratelimited(inode->i_mapping); 18933c9d31c7SFilipe Manana 189464708539SJosef Bacik btrfs_inode_unlock(inode, 0); 18957b508037SQu Wenruo if (ret < 0) 18964cb5300bSChris Mason break; 1897966d879bSQu Wenruo cur = max(cluster_end + 1, last_scanned); 1898c080b414SQu Wenruo if (ret > 0) { 1899c080b414SQu Wenruo ret = 0; 1900c080b414SQu Wenruo break; 1901c080b414SQu Wenruo } 1902ea0eba69SQu Wenruo cond_resched(); 19034cb5300bSChris Mason } 1904f46b5a66SChristoph Hellwig 19057b508037SQu Wenruo if (ra_allocated) 19067b508037SQu Wenruo kfree(ra); 1907c080b414SQu Wenruo /* 1908c080b414SQu Wenruo * Update range.start for autodefrag, this will indicate where to start 1909c080b414SQu Wenruo * in next run. 1910c080b414SQu Wenruo */ 1911c080b414SQu Wenruo range->start = cur; 19127b508037SQu Wenruo if (sectors_defragged) { 19137b508037SQu Wenruo /* 19147b508037SQu Wenruo * We have defragged some sectors, for compression case they 19157b508037SQu Wenruo * need to be written back immediately. 19167b508037SQu Wenruo */ 19177b508037SQu Wenruo if (range->flags & BTRFS_DEFRAG_RANGE_START_IO) { 19181e701a32SChris Mason filemap_flush(inode->i_mapping); 1919dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1920dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1921dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1922dec8ef90SFilipe Manana } 19237b508037SQu Wenruo if (range->compress_type == BTRFS_COMPRESS_LZO) 19240b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 19257b508037SQu Wenruo else if (range->compress_type == BTRFS_COMPRESS_ZSTD) 19265c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 19277b508037SQu Wenruo ret = sectors_defragged; 19281a419d85SLi Zefan } 19291e2ef46dSDavid Sterba if (do_compress) { 193064708539SJosef Bacik btrfs_inode_lock(inode, 0); 1931eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 193264708539SJosef Bacik btrfs_inode_unlock(inode, 0); 1933633085c7SFilipe David Borba Manana } 1934940100a4SChris Mason return ret; 1935f46b5a66SChristoph Hellwig } 1936f46b5a66SChristoph Hellwig 193717aaa434SDavid Sterba /* 193817aaa434SDavid Sterba * Try to start exclusive operation @type or cancel it if it's running. 193917aaa434SDavid Sterba * 194017aaa434SDavid Sterba * Return: 194117aaa434SDavid Sterba * 0 - normal mode, newly claimed op started 194217aaa434SDavid Sterba * >0 - normal mode, something else is running, 194317aaa434SDavid Sterba * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space 194417aaa434SDavid Sterba * ECANCELED - cancel mode, successful cancel 194517aaa434SDavid Sterba * ENOTCONN - cancel mode, operation not running anymore 194617aaa434SDavid Sterba */ 194717aaa434SDavid Sterba static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info, 194817aaa434SDavid Sterba enum btrfs_exclusive_operation type, bool cancel) 194917aaa434SDavid Sterba { 195017aaa434SDavid Sterba if (!cancel) { 195117aaa434SDavid Sterba /* Start normal op */ 195217aaa434SDavid Sterba if (!btrfs_exclop_start(fs_info, type)) 195317aaa434SDavid Sterba return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 195417aaa434SDavid Sterba /* Exclusive operation is now claimed */ 195517aaa434SDavid Sterba return 0; 195617aaa434SDavid Sterba } 195717aaa434SDavid Sterba 195817aaa434SDavid Sterba /* Cancel running op */ 195917aaa434SDavid Sterba if (btrfs_exclop_start_try_lock(fs_info, type)) { 196017aaa434SDavid Sterba /* 196117aaa434SDavid Sterba * This blocks any exclop finish from setting it to NONE, so we 196217aaa434SDavid Sterba * request cancellation. Either it runs and we will wait for it, 196317aaa434SDavid Sterba * or it has finished and no waiting will happen. 196417aaa434SDavid Sterba */ 196517aaa434SDavid Sterba atomic_inc(&fs_info->reloc_cancel_req); 196617aaa434SDavid Sterba btrfs_exclop_start_unlock(fs_info); 196717aaa434SDavid Sterba 196817aaa434SDavid Sterba if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags)) 196917aaa434SDavid Sterba wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING, 197017aaa434SDavid Sterba TASK_INTERRUPTIBLE); 197117aaa434SDavid Sterba 197217aaa434SDavid Sterba return -ECANCELED; 197317aaa434SDavid Sterba } 197417aaa434SDavid Sterba 197517aaa434SDavid Sterba /* Something else is running or none */ 197617aaa434SDavid Sterba return -ENOTCONN; 197717aaa434SDavid Sterba } 197817aaa434SDavid Sterba 1979198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 198076dda93cSYan, Zheng void __user *arg) 1981f46b5a66SChristoph Hellwig { 1982562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 19830b246afaSJeff Mahoney struct inode *inode = file_inode(file); 19840b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1985f46b5a66SChristoph Hellwig u64 new_size; 1986f46b5a66SChristoph Hellwig u64 old_size; 1987f46b5a66SChristoph Hellwig u64 devid = 1; 19880b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1989f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1990f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1991f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1992f46b5a66SChristoph Hellwig char *sizestr; 19939a40f122SGui Hecheng char *retptr; 1994f46b5a66SChristoph Hellwig char *devstr = NULL; 1995f46b5a66SChristoph Hellwig int ret = 0; 1996f46b5a66SChristoph Hellwig int mod = 0; 1997bb059a37SDavid Sterba bool cancel; 1998f46b5a66SChristoph Hellwig 1999e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2000e441d54dSChris Mason return -EPERM; 2001e441d54dSChris Mason 2002198605a8SMiao Xie ret = mnt_want_write_file(file); 2003198605a8SMiao Xie if (ret) 2004198605a8SMiao Xie return ret; 2005198605a8SMiao Xie 2006bb059a37SDavid Sterba /* 2007bb059a37SDavid Sterba * Read the arguments before checking exclusivity to be able to 2008bb059a37SDavid Sterba * distinguish regular resize and cancel 2009bb059a37SDavid Sterba */ 2010dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2011c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2012c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2013bb059a37SDavid Sterba goto out_drop; 2014c9e9f97bSIlya Dryomov } 20155516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2016f46b5a66SChristoph Hellwig sizestr = vol_args->name; 2017bb059a37SDavid Sterba cancel = (strcmp("cancel", sizestr) == 0); 2018bb059a37SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel); 2019bb059a37SDavid Sterba if (ret) 2020bb059a37SDavid Sterba goto out_free; 2021bb059a37SDavid Sterba /* Exclusive operation is now claimed */ 2022bb059a37SDavid Sterba 2023f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 2024f46b5a66SChristoph Hellwig if (devstr) { 2025f46b5a66SChristoph Hellwig sizestr = devstr + 1; 2026f46b5a66SChristoph Hellwig *devstr = '\0'; 2027f46b5a66SChristoph Hellwig devstr = vol_args->name; 202858dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 202958dfae63SZhangZhen if (ret) 2030bb059a37SDavid Sterba goto out_finish; 2031dfd79829SMiao Xie if (!devid) { 2032dfd79829SMiao Xie ret = -EINVAL; 2033bb059a37SDavid Sterba goto out_finish; 2034dfd79829SMiao Xie } 20350b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 2036f46b5a66SChristoph Hellwig } 2037dba60f3fSMiao Xie 2038562d7b15SJosef Bacik args.devid = devid; 2039562d7b15SJosef Bacik device = btrfs_find_device(fs_info->fs_devices, &args); 2040f46b5a66SChristoph Hellwig if (!device) { 20410b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 2042c1c9ff7cSGeert Uytterhoeven devid); 2043dfd79829SMiao Xie ret = -ENODEV; 2044bb059a37SDavid Sterba goto out_finish; 2045f46b5a66SChristoph Hellwig } 2046dba60f3fSMiao Xie 2047ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 20480b246afaSJeff Mahoney btrfs_info(fs_info, 2049efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 2050c1c9ff7cSGeert Uytterhoeven devid); 2051dfd79829SMiao Xie ret = -EPERM; 2052bb059a37SDavid Sterba goto out_finish; 20534e42ae1bSLiu Bo } 20544e42ae1bSLiu Bo 2055f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 2056cda00ebaSChristoph Hellwig new_size = bdev_nr_bytes(device->bdev); 2057f46b5a66SChristoph Hellwig else { 2058f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 2059f46b5a66SChristoph Hellwig mod = -1; 2060f46b5a66SChristoph Hellwig sizestr++; 2061f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 2062f46b5a66SChristoph Hellwig mod = 1; 2063f46b5a66SChristoph Hellwig sizestr++; 2064f46b5a66SChristoph Hellwig } 20659a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 20669a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 2067f46b5a66SChristoph Hellwig ret = -EINVAL; 2068bb059a37SDavid Sterba goto out_finish; 2069f46b5a66SChristoph Hellwig } 2070f46b5a66SChristoph Hellwig } 2071f46b5a66SChristoph Hellwig 2072401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 2073dfd79829SMiao Xie ret = -EPERM; 2074bb059a37SDavid Sterba goto out_finish; 207563a212abSStefan Behrens } 207663a212abSStefan Behrens 20777cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 2078f46b5a66SChristoph Hellwig 2079f46b5a66SChristoph Hellwig if (mod < 0) { 2080f46b5a66SChristoph Hellwig if (new_size > old_size) { 2081f46b5a66SChristoph Hellwig ret = -EINVAL; 2082bb059a37SDavid Sterba goto out_finish; 2083f46b5a66SChristoph Hellwig } 2084f46b5a66SChristoph Hellwig new_size = old_size - new_size; 2085f46b5a66SChristoph Hellwig } else if (mod > 0) { 2086eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 2087902c68a4SGui Hecheng ret = -ERANGE; 2088bb059a37SDavid Sterba goto out_finish; 2089eb8052e0SWenliang Fan } 2090f46b5a66SChristoph Hellwig new_size = old_size + new_size; 2091f46b5a66SChristoph Hellwig } 2092f46b5a66SChristoph Hellwig 2093ee22184bSByongho Lee if (new_size < SZ_256M) { 2094f46b5a66SChristoph Hellwig ret = -EINVAL; 2095bb059a37SDavid Sterba goto out_finish; 2096f46b5a66SChristoph Hellwig } 2097cda00ebaSChristoph Hellwig if (new_size > bdev_nr_bytes(device->bdev)) { 2098f46b5a66SChristoph Hellwig ret = -EFBIG; 2099bb059a37SDavid Sterba goto out_finish; 2100f46b5a66SChristoph Hellwig } 2101f46b5a66SChristoph Hellwig 210247f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 2103f46b5a66SChristoph Hellwig 2104f46b5a66SChristoph Hellwig if (new_size > old_size) { 2105a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 210698d5dc13STsutomu Itoh if (IS_ERR(trans)) { 210798d5dc13STsutomu Itoh ret = PTR_ERR(trans); 2108bb059a37SDavid Sterba goto out_finish; 210998d5dc13STsutomu Itoh } 2110f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 21113a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 2112ece7d20eSMike Fleetwood } else if (new_size < old_size) { 2113f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 21140253f40eSjeff.liu } /* equal, nothing need to do */ 2115f46b5a66SChristoph Hellwig 2116faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 2117faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 2118faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 2119faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 2120faf8f7b9SMarcos Paulo de Souza old_size, new_size); 2121bb059a37SDavid Sterba out_finish: 2122bb059a37SDavid Sterba btrfs_exclop_finish(fs_info); 2123c9e9f97bSIlya Dryomov out_free: 2124f46b5a66SChristoph Hellwig kfree(vol_args); 2125bb059a37SDavid Sterba out_drop: 212618f39c41SIlya Dryomov mnt_drop_write_file(file); 2127f46b5a66SChristoph Hellwig return ret; 2128f46b5a66SChristoph Hellwig } 2129f46b5a66SChristoph Hellwig 21305d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 21314d4340c9SChristian Brauner struct user_namespace *mnt_userns, 213252f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 21335d54c67eSNikolay Borisov bool readonly, 21348696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 2135f46b5a66SChristoph Hellwig { 2136f46b5a66SChristoph Hellwig int namelen; 21373de4586cSChris Mason int ret = 0; 2138f46b5a66SChristoph Hellwig 2139325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 2140325c50e3SJeff Mahoney return -ENOTDIR; 2141325c50e3SJeff Mahoney 2142a874a63eSLiu Bo ret = mnt_want_write_file(file); 2143a874a63eSLiu Bo if (ret) 2144a874a63eSLiu Bo goto out; 2145a874a63eSLiu Bo 214672fd032eSSage Weil namelen = strlen(name); 214772fd032eSSage Weil if (strchr(name, '/')) { 2148f46b5a66SChristoph Hellwig ret = -EINVAL; 2149a874a63eSLiu Bo goto out_drop_write; 2150f46b5a66SChristoph Hellwig } 2151f46b5a66SChristoph Hellwig 215216780cabSChris Mason if (name[0] == '.' && 215316780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 215416780cabSChris Mason ret = -EEXIST; 2155a874a63eSLiu Bo goto out_drop_write; 215616780cabSChris Mason } 215716780cabSChris Mason 21583de4586cSChris Mason if (subvol) { 21594d4340c9SChristian Brauner ret = btrfs_mksubvol(&file->f_path, mnt_userns, name, 21604d4340c9SChristian Brauner namelen, NULL, readonly, inherit); 2161cb8e7090SChristoph Hellwig } else { 21622903ff01SAl Viro struct fd src = fdget(fd); 21633de4586cSChris Mason struct inode *src_inode; 21642903ff01SAl Viro if (!src.file) { 21653de4586cSChris Mason ret = -EINVAL; 2166a874a63eSLiu Bo goto out_drop_write; 21673de4586cSChris Mason } 21683de4586cSChris Mason 2169496ad9aaSAl Viro src_inode = file_inode(src.file); 2170496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 2171c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 2172efe120a0SFrank Holton "Snapshot src from another FS"); 217323ad5b17SKusanagi Kouichi ret = -EXDEV; 21744d4340c9SChristian Brauner } else if (!inode_owner_or_capable(mnt_userns, src_inode)) { 2175d0242061SDavid Sterba /* 2176d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 2177d0242061SDavid Sterba * are limited to own subvolumes only 2178d0242061SDavid Sterba */ 2179d0242061SDavid Sterba ret = -EPERM; 2180ecd18815SAl Viro } else { 21814d4340c9SChristian Brauner ret = btrfs_mksnapshot(&file->f_path, mnt_userns, 21824d4340c9SChristian Brauner name, namelen, 218372fd032eSSage Weil BTRFS_I(src_inode)->root, 21845d54c67eSNikolay Borisov readonly, inherit); 2185ecd18815SAl Viro } 21862903ff01SAl Viro fdput(src); 2187cb8e7090SChristoph Hellwig } 2188a874a63eSLiu Bo out_drop_write: 2189a874a63eSLiu Bo mnt_drop_write_file(file); 2190f46b5a66SChristoph Hellwig out: 219172fd032eSSage Weil return ret; 219272fd032eSSage Weil } 219372fd032eSSage Weil 219472fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 2195fa0d2b9bSLi Zefan void __user *arg, int subvol) 219672fd032eSSage Weil { 2197fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 219872fd032eSSage Weil int ret; 219972fd032eSSage Weil 2200325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 2201325c50e3SJeff Mahoney return -ENOTDIR; 2202325c50e3SJeff Mahoney 2203fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2204fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 2205fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 2206fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2207fa0d2b9bSLi Zefan 22084d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 22094d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 22104d4340c9SChristian Brauner false, NULL); 2211fa0d2b9bSLi Zefan 2212fa0d2b9bSLi Zefan kfree(vol_args); 2213fa0d2b9bSLi Zefan return ret; 2214fa0d2b9bSLi Zefan } 2215fa0d2b9bSLi Zefan 2216fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 2217fa0d2b9bSLi Zefan void __user *arg, int subvol) 2218fa0d2b9bSLi Zefan { 2219fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 2220fa0d2b9bSLi Zefan int ret; 2221b83cc969SLi Zefan bool readonly = false; 22226f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 222372fd032eSSage Weil 2224325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 2225325c50e3SJeff Mahoney return -ENOTDIR; 2226325c50e3SJeff Mahoney 2227fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2228fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 2229fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 2230fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 2231fdfb1e4fSLi Zefan 2232673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 2233b83cc969SLi Zefan ret = -EOPNOTSUPP; 2234c47ca32dSDan Carpenter goto free_args; 2235fdfb1e4fSLi Zefan } 2236fdfb1e4fSLi Zefan 2237b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 2238b83cc969SLi Zefan readonly = true; 22396f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 22405011c5a6SDan Carpenter u64 nums; 22415011c5a6SDan Carpenter 22425011c5a6SDan Carpenter if (vol_args->size < sizeof(*inherit) || 22435011c5a6SDan Carpenter vol_args->size > PAGE_SIZE) { 22446f72c7e2SArne Jansen ret = -EINVAL; 2245c47ca32dSDan Carpenter goto free_args; 22466f72c7e2SArne Jansen } 22476f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 22486f72c7e2SArne Jansen if (IS_ERR(inherit)) { 22496f72c7e2SArne Jansen ret = PTR_ERR(inherit); 2250c47ca32dSDan Carpenter goto free_args; 22516f72c7e2SArne Jansen } 22525011c5a6SDan Carpenter 22535011c5a6SDan Carpenter if (inherit->num_qgroups > PAGE_SIZE || 22545011c5a6SDan Carpenter inherit->num_ref_copies > PAGE_SIZE || 22555011c5a6SDan Carpenter inherit->num_excl_copies > PAGE_SIZE) { 22565011c5a6SDan Carpenter ret = -EINVAL; 22575011c5a6SDan Carpenter goto free_inherit; 22585011c5a6SDan Carpenter } 22595011c5a6SDan Carpenter 22605011c5a6SDan Carpenter nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + 22615011c5a6SDan Carpenter 2 * inherit->num_excl_copies; 22625011c5a6SDan Carpenter if (vol_args->size != struct_size(inherit, qgroups, nums)) { 22635011c5a6SDan Carpenter ret = -EINVAL; 22645011c5a6SDan Carpenter goto free_inherit; 22655011c5a6SDan Carpenter } 22666f72c7e2SArne Jansen } 226775eaa0e2SSage Weil 22684d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 22694d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 22704d4340c9SChristian Brauner readonly, inherit); 2271c47ca32dSDan Carpenter if (ret) 2272c47ca32dSDan Carpenter goto free_inherit; 2273c47ca32dSDan Carpenter free_inherit: 22746f72c7e2SArne Jansen kfree(inherit); 2275c47ca32dSDan Carpenter free_args: 2276c47ca32dSDan Carpenter kfree(vol_args); 2277f46b5a66SChristoph Hellwig return ret; 2278f46b5a66SChristoph Hellwig } 2279f46b5a66SChristoph Hellwig 22809ad12305SSahil Kang static noinline int btrfs_ioctl_subvol_getflags(struct inode *inode, 22810caa102dSLi Zefan void __user *arg) 22820caa102dSLi Zefan { 22830b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 22840caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 22850caa102dSLi Zefan int ret = 0; 22860caa102dSLi Zefan u64 flags = 0; 22870caa102dSLi Zefan 22884a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 22890caa102dSLi Zefan return -EINVAL; 22900caa102dSLi Zefan 22910b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 22920caa102dSLi Zefan if (btrfs_root_readonly(root)) 22930caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 22940b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 22950caa102dSLi Zefan 22960caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 22970caa102dSLi Zefan ret = -EFAULT; 22980caa102dSLi Zefan 22990caa102dSLi Zefan return ret; 23000caa102dSLi Zefan } 23010caa102dSLi Zefan 23020caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 23030caa102dSLi Zefan void __user *arg) 23040caa102dSLi Zefan { 2305496ad9aaSAl Viro struct inode *inode = file_inode(file); 23060b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 23070caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 23080caa102dSLi Zefan struct btrfs_trans_handle *trans; 23090caa102dSLi Zefan u64 root_flags; 23100caa102dSLi Zefan u64 flags; 23110caa102dSLi Zefan int ret = 0; 23120caa102dSLi Zefan 231339e1674fSChristian Brauner if (!inode_owner_or_capable(file_mnt_user_ns(file), inode)) 2314bd60ea0fSDavid Sterba return -EPERM; 2315bd60ea0fSDavid Sterba 2316b9ca0664SLiu Bo ret = mnt_want_write_file(file); 2317b9ca0664SLiu Bo if (ret) 2318b9ca0664SLiu Bo goto out; 23190caa102dSLi Zefan 23204a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 2321b9ca0664SLiu Bo ret = -EINVAL; 2322b9ca0664SLiu Bo goto out_drop_write; 2323b9ca0664SLiu Bo } 23240caa102dSLi Zefan 2325b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 2326b9ca0664SLiu Bo ret = -EFAULT; 2327b9ca0664SLiu Bo goto out_drop_write; 2328b9ca0664SLiu Bo } 23290caa102dSLi Zefan 2330b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 2331b9ca0664SLiu Bo ret = -EOPNOTSUPP; 2332b9ca0664SLiu Bo goto out_drop_write; 2333b9ca0664SLiu Bo } 23340caa102dSLi Zefan 23350b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 23360caa102dSLi Zefan 23370caa102dSLi Zefan /* nothing to do */ 23380caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 2339b9ca0664SLiu Bo goto out_drop_sem; 23400caa102dSLi Zefan 23410caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 23422c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 23430caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 23440caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 23452c686537SDavid Sterba } else { 23462c686537SDavid Sterba /* 23472c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 23482c686537SDavid Sterba * send 23492c686537SDavid Sterba */ 23502c686537SDavid Sterba spin_lock(&root->root_item_lock); 23512c686537SDavid Sterba if (root->send_in_progress == 0) { 23520caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 23530caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 23542c686537SDavid Sterba spin_unlock(&root->root_item_lock); 23552c686537SDavid Sterba } else { 23562c686537SDavid Sterba spin_unlock(&root->root_item_lock); 23570b246afaSJeff Mahoney btrfs_warn(fs_info, 23582c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 23592c686537SDavid Sterba root->root_key.objectid); 23602c686537SDavid Sterba ret = -EPERM; 23612c686537SDavid Sterba goto out_drop_sem; 23622c686537SDavid Sterba } 23632c686537SDavid Sterba } 23640caa102dSLi Zefan 23650caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 23660caa102dSLi Zefan if (IS_ERR(trans)) { 23670caa102dSLi Zefan ret = PTR_ERR(trans); 23680caa102dSLi Zefan goto out_reset; 23690caa102dSLi Zefan } 23700caa102dSLi Zefan 23710b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 23720caa102dSLi Zefan &root->root_key, &root->root_item); 23739417ebc8SNikolay Borisov if (ret < 0) { 23749417ebc8SNikolay Borisov btrfs_end_transaction(trans); 23759417ebc8SNikolay Borisov goto out_reset; 23769417ebc8SNikolay Borisov } 23770caa102dSLi Zefan 23789417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 23799417ebc8SNikolay Borisov 23800caa102dSLi Zefan out_reset: 23810caa102dSLi Zefan if (ret) 23820caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 2383b9ca0664SLiu Bo out_drop_sem: 23840b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 2385b9ca0664SLiu Bo out_drop_write: 2386b9ca0664SLiu Bo mnt_drop_write_file(file); 2387b9ca0664SLiu Bo out: 23880caa102dSLi Zefan return ret; 23890caa102dSLi Zefan } 23900caa102dSLi Zefan 2391ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 2392ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 2393ac8e9819SChris Mason { 2394abc6e134SChris Mason struct btrfs_key test; 2395abc6e134SChris Mason int ret; 2396abc6e134SChris Mason 2397abc6e134SChris Mason test.objectid = sk->min_objectid; 2398abc6e134SChris Mason test.type = sk->min_type; 2399abc6e134SChris Mason test.offset = sk->min_offset; 2400abc6e134SChris Mason 2401abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2402abc6e134SChris Mason if (ret < 0) 2403ac8e9819SChris Mason return 0; 2404abc6e134SChris Mason 2405abc6e134SChris Mason test.objectid = sk->max_objectid; 2406abc6e134SChris Mason test.type = sk->max_type; 2407abc6e134SChris Mason test.offset = sk->max_offset; 2408abc6e134SChris Mason 2409abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2410abc6e134SChris Mason if (ret > 0) 2411ac8e9819SChris Mason return 0; 2412ac8e9819SChris Mason return 1; 2413ac8e9819SChris Mason } 2414ac8e9819SChris Mason 2415df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2416ac8e9819SChris Mason struct btrfs_key *key, 2417ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 24189b6e817dSGerhard Heift size_t *buf_size, 2419ba346b35SGerhard Heift char __user *ubuf, 2420ac8e9819SChris Mason unsigned long *sk_offset, 2421ac8e9819SChris Mason int *num_found) 2422ac8e9819SChris Mason { 2423ac8e9819SChris Mason u64 found_transid; 2424ac8e9819SChris Mason struct extent_buffer *leaf; 2425ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2426dd81d459SNaohiro Aota struct btrfs_key test; 2427ac8e9819SChris Mason unsigned long item_off; 2428ac8e9819SChris Mason unsigned long item_len; 2429ac8e9819SChris Mason int nritems; 2430ac8e9819SChris Mason int i; 2431ac8e9819SChris Mason int slot; 2432ac8e9819SChris Mason int ret = 0; 2433ac8e9819SChris Mason 2434ac8e9819SChris Mason leaf = path->nodes[0]; 2435ac8e9819SChris Mason slot = path->slots[0]; 2436ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2437ac8e9819SChris Mason 2438ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2439ac8e9819SChris Mason i = nritems; 2440ac8e9819SChris Mason goto advance_key; 2441ac8e9819SChris Mason } 2442ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2443ac8e9819SChris Mason 2444ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2445ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 24463212fa14SJosef Bacik item_len = btrfs_item_size(leaf, i); 2447ac8e9819SChris Mason 244803b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 244903b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 245003b71c6cSGabriel de Perthuis continue; 245103b71c6cSGabriel de Perthuis 24529b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 24538f5f6178SGerhard Heift if (*num_found) { 2454ac8e9819SChris Mason ret = 1; 24558f5f6178SGerhard Heift goto out; 24568f5f6178SGerhard Heift } 24578f5f6178SGerhard Heift 24588f5f6178SGerhard Heift /* 24598f5f6178SGerhard Heift * return one empty item back for v1, which does not 24608f5f6178SGerhard Heift * handle -EOVERFLOW 24618f5f6178SGerhard Heift */ 24628f5f6178SGerhard Heift 24639b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2464ac8e9819SChris Mason item_len = 0; 24658f5f6178SGerhard Heift ret = -EOVERFLOW; 24668f5f6178SGerhard Heift } 2467ac8e9819SChris Mason 24689b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2469ac8e9819SChris Mason ret = 1; 247025c9bc2eSGerhard Heift goto out; 2471ac8e9819SChris Mason } 2472ac8e9819SChris Mason 2473ac8e9819SChris Mason sh.objectid = key->objectid; 2474ac8e9819SChris Mason sh.offset = key->offset; 2475ac8e9819SChris Mason sh.type = key->type; 2476ac8e9819SChris Mason sh.len = item_len; 2477ac8e9819SChris Mason sh.transid = found_transid; 2478ac8e9819SChris Mason 2479a48b73ecSJosef Bacik /* 2480a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 2481a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 2482a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 2483a48b73ecSJosef Bacik * properly this next time through 2484a48b73ecSJosef Bacik */ 2485a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 2486a48b73ecSJosef Bacik ret = 0; 2487ba346b35SGerhard Heift goto out; 2488ba346b35SGerhard Heift } 2489ba346b35SGerhard Heift 2490ac8e9819SChris Mason *sk_offset += sizeof(sh); 2491ac8e9819SChris Mason 2492ac8e9819SChris Mason if (item_len) { 2493ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2494a48b73ecSJosef Bacik /* 2495a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 2496a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 2497a48b73ecSJosef Bacik */ 2498a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 2499ba346b35SGerhard Heift item_off, item_len)) { 2500a48b73ecSJosef Bacik ret = 0; 2501a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 2502ba346b35SGerhard Heift goto out; 2503ba346b35SGerhard Heift } 2504ba346b35SGerhard Heift 2505ac8e9819SChris Mason *sk_offset += item_len; 2506ac8e9819SChris Mason } 2507e2156867SHugo Mills (*num_found)++; 2508ac8e9819SChris Mason 25098f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 25108f5f6178SGerhard Heift goto out; 25118f5f6178SGerhard Heift 251225c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 251325c9bc2eSGerhard Heift ret = 1; 251425c9bc2eSGerhard Heift goto out; 251525c9bc2eSGerhard Heift } 2516ac8e9819SChris Mason } 2517ac8e9819SChris Mason advance_key: 2518ac8e9819SChris Mason ret = 0; 2519dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2520dd81d459SNaohiro Aota test.type = sk->max_type; 2521dd81d459SNaohiro Aota test.offset = sk->max_offset; 2522dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2523dd81d459SNaohiro Aota ret = 1; 2524dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2525abc6e134SChris Mason key->offset++; 2526dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2527abc6e134SChris Mason key->offset = 0; 2528abc6e134SChris Mason key->type++; 2529dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2530abc6e134SChris Mason key->offset = 0; 2531abc6e134SChris Mason key->type = 0; 2532abc6e134SChris Mason key->objectid++; 2533abc6e134SChris Mason } else 2534abc6e134SChris Mason ret = 1; 253525c9bc2eSGerhard Heift out: 2536ba346b35SGerhard Heift /* 2537ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2538ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2539ba346b35SGerhard Heift * * all items were found 2540ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2541ba346b35SGerhard Heift * leaf 2542ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2543ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2544ba346b35SGerhard Heift */ 2545ac8e9819SChris Mason return ret; 2546ac8e9819SChris Mason } 2547ac8e9819SChris Mason 2548ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 254912544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 25509b6e817dSGerhard Heift size_t *buf_size, 2551ba346b35SGerhard Heift char __user *ubuf) 2552ac8e9819SChris Mason { 25530b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2554ac8e9819SChris Mason struct btrfs_root *root; 2555ac8e9819SChris Mason struct btrfs_key key; 2556ac8e9819SChris Mason struct btrfs_path *path; 2557ac8e9819SChris Mason int ret; 2558ac8e9819SChris Mason int num_found = 0; 2559ac8e9819SChris Mason unsigned long sk_offset = 0; 2560ac8e9819SChris Mason 25619b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 25629b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 256312544442SGerhard Heift return -EOVERFLOW; 25649b6e817dSGerhard Heift } 256512544442SGerhard Heift 2566ac8e9819SChris Mason path = btrfs_alloc_path(); 2567ac8e9819SChris Mason if (!path) 2568ac8e9819SChris Mason return -ENOMEM; 2569ac8e9819SChris Mason 2570ac8e9819SChris Mason if (sk->tree_id == 0) { 2571ac8e9819SChris Mason /* search the root of the inode that was passed */ 257200246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2573ac8e9819SChris Mason } else { 257456e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2575ac8e9819SChris Mason if (IS_ERR(root)) { 2576ac8e9819SChris Mason btrfs_free_path(path); 2577ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2578ac8e9819SChris Mason } 2579ac8e9819SChris Mason } 2580ac8e9819SChris Mason 2581ac8e9819SChris Mason key.objectid = sk->min_objectid; 2582ac8e9819SChris Mason key.type = sk->min_type; 2583ac8e9819SChris Mason key.offset = sk->min_offset; 2584ac8e9819SChris Mason 2585ac8e9819SChris Mason while (1) { 2586bb523b40SAndreas Gruenbacher ret = -EFAULT; 258718788e34SCatalin Marinas /* 258818788e34SCatalin Marinas * Ensure that the whole user buffer is faulted in at sub-page 258918788e34SCatalin Marinas * granularity, otherwise the loop may live-lock. 259018788e34SCatalin Marinas */ 259118788e34SCatalin Marinas if (fault_in_subpage_writeable(ubuf + sk_offset, 259218788e34SCatalin Marinas *buf_size - sk_offset)) 2593a48b73ecSJosef Bacik break; 2594a48b73ecSJosef Bacik 25956174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2596ac8e9819SChris Mason if (ret != 0) { 2597ac8e9819SChris Mason if (ret > 0) 2598ac8e9819SChris Mason ret = 0; 2599ac8e9819SChris Mason goto err; 2600ac8e9819SChris Mason } 2601df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2602ac8e9819SChris Mason &sk_offset, &num_found); 2603b3b4aa74SDavid Sterba btrfs_release_path(path); 260425c9bc2eSGerhard Heift if (ret) 2605ac8e9819SChris Mason break; 2606ac8e9819SChris Mason 2607ac8e9819SChris Mason } 26088f5f6178SGerhard Heift if (ret > 0) 2609ac8e9819SChris Mason ret = 0; 2610ac8e9819SChris Mason err: 2611ac8e9819SChris Mason sk->nr_items = num_found; 261200246528SJosef Bacik btrfs_put_root(root); 2613ac8e9819SChris Mason btrfs_free_path(path); 2614ac8e9819SChris Mason return ret; 2615ac8e9819SChris Mason } 2616ac8e9819SChris Mason 26179ad12305SSahil Kang static noinline int btrfs_ioctl_tree_search(struct inode *inode, 2618ac8e9819SChris Mason void __user *argp) 2619ac8e9819SChris Mason { 26200d031dc4SYu Zhe struct btrfs_ioctl_search_args __user *uargs = argp; 2621ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2622ac8e9819SChris Mason int ret; 26239b6e817dSGerhard Heift size_t buf_size; 2624ac8e9819SChris Mason 2625ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2626ac8e9819SChris Mason return -EPERM; 2627ac8e9819SChris Mason 2628ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2629ba346b35SGerhard Heift return -EFAULT; 2630ba346b35SGerhard Heift 2631ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2632ac8e9819SChris Mason 2633ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 26348f5f6178SGerhard Heift 26358f5f6178SGerhard Heift /* 26368f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 26378f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 26388f5f6178SGerhard Heift */ 26398f5f6178SGerhard Heift if (ret == -EOVERFLOW) 26408f5f6178SGerhard Heift ret = 0; 26418f5f6178SGerhard Heift 2642ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2643ac8e9819SChris Mason ret = -EFAULT; 2644ac8e9819SChris Mason return ret; 2645ac8e9819SChris Mason } 2646ac8e9819SChris Mason 26479ad12305SSahil Kang static noinline int btrfs_ioctl_tree_search_v2(struct inode *inode, 2648cc68a8a5SGerhard Heift void __user *argp) 2649cc68a8a5SGerhard Heift { 26500d031dc4SYu Zhe struct btrfs_ioctl_search_args_v2 __user *uarg = argp; 2651cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2652cc68a8a5SGerhard Heift int ret; 2653cc68a8a5SGerhard Heift size_t buf_size; 2654ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2655cc68a8a5SGerhard Heift 2656cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2657cc68a8a5SGerhard Heift return -EPERM; 2658cc68a8a5SGerhard Heift 2659cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2660cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2661cc68a8a5SGerhard Heift return -EFAULT; 2662cc68a8a5SGerhard Heift 2663cc68a8a5SGerhard Heift buf_size = args.buf_size; 2664cc68a8a5SGerhard Heift 2665cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2666cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2667cc68a8a5SGerhard Heift buf_size = buf_limit; 2668cc68a8a5SGerhard Heift 2669cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2670718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2671cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2672cc68a8a5SGerhard Heift ret = -EFAULT; 2673cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2674cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2675cc68a8a5SGerhard Heift ret = -EFAULT; 2676cc68a8a5SGerhard Heift 267776dda93cSYan, Zheng return ret; 267876dda93cSYan, Zheng } 267976dda93cSYan, Zheng 268098d377a0STARUISI Hiroaki /* 2681ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2682ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 268398d377a0STARUISI Hiroaki */ 268498d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 268598d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 268698d377a0STARUISI Hiroaki { 268798d377a0STARUISI Hiroaki struct btrfs_root *root; 268898d377a0STARUISI Hiroaki struct btrfs_key key; 2689ac8e9819SChris Mason char *ptr; 269098d377a0STARUISI Hiroaki int ret = -1; 269198d377a0STARUISI Hiroaki int slot; 269298d377a0STARUISI Hiroaki int len; 269398d377a0STARUISI Hiroaki int total_len = 0; 269498d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 269598d377a0STARUISI Hiroaki struct extent_buffer *l; 269698d377a0STARUISI Hiroaki struct btrfs_path *path; 269798d377a0STARUISI Hiroaki 269898d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 269998d377a0STARUISI Hiroaki name[0]='\0'; 270098d377a0STARUISI Hiroaki return 0; 270198d377a0STARUISI Hiroaki } 270298d377a0STARUISI Hiroaki 270398d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 270498d377a0STARUISI Hiroaki if (!path) 270598d377a0STARUISI Hiroaki return -ENOMEM; 270698d377a0STARUISI Hiroaki 2707c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 270898d377a0STARUISI Hiroaki 270956e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 271098d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2711ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 271288234012SJosef Bacik root = NULL; 271388234012SJosef Bacik goto out; 271488234012SJosef Bacik } 271598d377a0STARUISI Hiroaki 271698d377a0STARUISI Hiroaki key.objectid = dirid; 271798d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 27188ad6fcabSChris Mason key.offset = (u64)-1; 271998d377a0STARUISI Hiroaki 272098d377a0STARUISI Hiroaki while (1) { 27210ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 272218674c6cSFilipe David Borba Manana if (ret < 0) 272318674c6cSFilipe David Borba Manana goto out; 272418674c6cSFilipe David Borba Manana else if (ret > 0) { 2725ac8e9819SChris Mason ret = -ENOENT; 272698d377a0STARUISI Hiroaki goto out; 2727ac8e9819SChris Mason } 272818674c6cSFilipe David Borba Manana 272918674c6cSFilipe David Borba Manana l = path->nodes[0]; 273018674c6cSFilipe David Borba Manana slot = path->slots[0]; 273198d377a0STARUISI Hiroaki 273298d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 273398d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 273498d377a0STARUISI Hiroaki ptr -= len + 1; 273598d377a0STARUISI Hiroaki total_len += len + 1; 2736a696cf35SFilipe David Borba Manana if (ptr < name) { 2737a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 273898d377a0STARUISI Hiroaki goto out; 2739a696cf35SFilipe David Borba Manana } 274098d377a0STARUISI Hiroaki 274198d377a0STARUISI Hiroaki *(ptr + len) = '/'; 274298d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 274398d377a0STARUISI Hiroaki 274498d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 274598d377a0STARUISI Hiroaki break; 274698d377a0STARUISI Hiroaki 2747b3b4aa74SDavid Sterba btrfs_release_path(path); 274898d377a0STARUISI Hiroaki key.objectid = key.offset; 27498ad6fcabSChris Mason key.offset = (u64)-1; 275098d377a0STARUISI Hiroaki dirid = key.objectid; 275198d377a0STARUISI Hiroaki } 275277906a50SLi Zefan memmove(name, ptr, total_len); 275398d377a0STARUISI Hiroaki name[total_len] = '\0'; 275498d377a0STARUISI Hiroaki ret = 0; 275598d377a0STARUISI Hiroaki out: 275600246528SJosef Bacik btrfs_put_root(root); 275798d377a0STARUISI Hiroaki btrfs_free_path(path); 2758ac8e9819SChris Mason return ret; 2759ac8e9819SChris Mason } 2760ac8e9819SChris Mason 27616623d9a0SChristian Brauner static int btrfs_search_path_in_tree_user(struct user_namespace *mnt_userns, 27626623d9a0SChristian Brauner struct inode *inode, 276323d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 276423d0b79dSTomohiro Misono { 276523d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 276623d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 276723d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 276823d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 276923d0b79dSTomohiro Misono u64 dirid = args->dirid; 277023d0b79dSTomohiro Misono unsigned long item_off; 277123d0b79dSTomohiro Misono unsigned long item_len; 277223d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 277323d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2774b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 277523d0b79dSTomohiro Misono struct btrfs_path *path; 277623d0b79dSTomohiro Misono struct btrfs_key key, key2; 277723d0b79dSTomohiro Misono struct extent_buffer *leaf; 277823d0b79dSTomohiro Misono struct inode *temp_inode; 277923d0b79dSTomohiro Misono char *ptr; 278023d0b79dSTomohiro Misono int slot; 278123d0b79dSTomohiro Misono int len; 278223d0b79dSTomohiro Misono int total_len = 0; 278323d0b79dSTomohiro Misono int ret; 278423d0b79dSTomohiro Misono 278523d0b79dSTomohiro Misono path = btrfs_alloc_path(); 278623d0b79dSTomohiro Misono if (!path) 278723d0b79dSTomohiro Misono return -ENOMEM; 278823d0b79dSTomohiro Misono 278923d0b79dSTomohiro Misono /* 279023d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 279123d0b79dSTomohiro Misono * construct the path in from the bottom up. 279223d0b79dSTomohiro Misono */ 279323d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 279423d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 279523d0b79dSTomohiro Misono 279656e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 279723d0b79dSTomohiro Misono if (IS_ERR(root)) { 279823d0b79dSTomohiro Misono ret = PTR_ERR(root); 279923d0b79dSTomohiro Misono goto out; 280023d0b79dSTomohiro Misono } 280123d0b79dSTomohiro Misono 280223d0b79dSTomohiro Misono key.objectid = dirid; 280323d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 280423d0b79dSTomohiro Misono key.offset = (u64)-1; 280523d0b79dSTomohiro Misono while (1) { 28060ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 28070ff40a91SMarcos Paulo de Souza if (ret < 0) 2808b8a49ae1SJosef Bacik goto out_put; 28090ff40a91SMarcos Paulo de Souza else if (ret > 0) { 281023d0b79dSTomohiro Misono ret = -ENOENT; 2811b8a49ae1SJosef Bacik goto out_put; 281223d0b79dSTomohiro Misono } 281323d0b79dSTomohiro Misono 281423d0b79dSTomohiro Misono leaf = path->nodes[0]; 281523d0b79dSTomohiro Misono slot = path->slots[0]; 281623d0b79dSTomohiro Misono 281723d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 281823d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 281923d0b79dSTomohiro Misono ptr -= len + 1; 282023d0b79dSTomohiro Misono total_len += len + 1; 282123d0b79dSTomohiro Misono if (ptr < args->path) { 282223d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2823b8a49ae1SJosef Bacik goto out_put; 282423d0b79dSTomohiro Misono } 282523d0b79dSTomohiro Misono 282623d0b79dSTomohiro Misono *(ptr + len) = '/'; 282723d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 282823d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 282923d0b79dSTomohiro Misono 283023d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 283123d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 283223d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 283323d0b79dSTomohiro Misono if (ret < 0) { 2834b8a49ae1SJosef Bacik goto out_put; 283523d0b79dSTomohiro Misono } else if (ret > 0) { 283623d0b79dSTomohiro Misono ret = -ENOENT; 2837b8a49ae1SJosef Bacik goto out_put; 283823d0b79dSTomohiro Misono } 283923d0b79dSTomohiro Misono 284023d0b79dSTomohiro Misono leaf = path->nodes[0]; 284123d0b79dSTomohiro Misono slot = path->slots[0]; 284223d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 284323d0b79dSTomohiro Misono if (key2.objectid != dirid) { 284423d0b79dSTomohiro Misono ret = -ENOENT; 2845b8a49ae1SJosef Bacik goto out_put; 284623d0b79dSTomohiro Misono } 284723d0b79dSTomohiro Misono 28480202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 28493ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 28503ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2851b8a49ae1SJosef Bacik goto out_put; 28523ca57bd6SMisono Tomohiro } 28536623d9a0SChristian Brauner ret = inode_permission(mnt_userns, temp_inode, 285447291baaSChristian Brauner MAY_READ | MAY_EXEC); 285523d0b79dSTomohiro Misono iput(temp_inode); 285623d0b79dSTomohiro Misono if (ret) { 285723d0b79dSTomohiro Misono ret = -EACCES; 2858b8a49ae1SJosef Bacik goto out_put; 285923d0b79dSTomohiro Misono } 286023d0b79dSTomohiro Misono 286123d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 286223d0b79dSTomohiro Misono break; 286323d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 286423d0b79dSTomohiro Misono ret = -EACCES; 2865b8a49ae1SJosef Bacik goto out_put; 286623d0b79dSTomohiro Misono } 286723d0b79dSTomohiro Misono 286823d0b79dSTomohiro Misono btrfs_release_path(path); 286923d0b79dSTomohiro Misono key.objectid = key.offset; 287023d0b79dSTomohiro Misono key.offset = (u64)-1; 287123d0b79dSTomohiro Misono dirid = key.objectid; 287223d0b79dSTomohiro Misono } 287323d0b79dSTomohiro Misono 287423d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 287523d0b79dSTomohiro Misono args->path[total_len] = '\0'; 287600246528SJosef Bacik btrfs_put_root(root); 2877b8a49ae1SJosef Bacik root = NULL; 287823d0b79dSTomohiro Misono btrfs_release_path(path); 287923d0b79dSTomohiro Misono } 288023d0b79dSTomohiro Misono 288123d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 288223d0b79dSTomohiro Misono key.objectid = treeid; 288323d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 288423d0b79dSTomohiro Misono key.offset = args->treeid; 2885b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 288623d0b79dSTomohiro Misono if (ret < 0) { 288723d0b79dSTomohiro Misono goto out; 288823d0b79dSTomohiro Misono } else if (ret > 0) { 288923d0b79dSTomohiro Misono ret = -ENOENT; 289023d0b79dSTomohiro Misono goto out; 289123d0b79dSTomohiro Misono } 289223d0b79dSTomohiro Misono 289323d0b79dSTomohiro Misono leaf = path->nodes[0]; 289423d0b79dSTomohiro Misono slot = path->slots[0]; 289523d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 289623d0b79dSTomohiro Misono 289723d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 28983212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot); 289923d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 290023d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 290123d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 290223d0b79dSTomohiro Misono ret = -EINVAL; 290323d0b79dSTomohiro Misono goto out; 290423d0b79dSTomohiro Misono } 290523d0b79dSTomohiro Misono 290623d0b79dSTomohiro Misono /* Copy subvolume's name */ 290723d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 290823d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 290923d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 291023d0b79dSTomohiro Misono args->name[item_len] = 0; 291123d0b79dSTomohiro Misono 2912b8a49ae1SJosef Bacik out_put: 291300246528SJosef Bacik btrfs_put_root(root); 291423d0b79dSTomohiro Misono out: 291523d0b79dSTomohiro Misono btrfs_free_path(path); 291623d0b79dSTomohiro Misono return ret; 291723d0b79dSTomohiro Misono } 291823d0b79dSTomohiro Misono 2919dc408ccdSSahil Kang static noinline int btrfs_ioctl_ino_lookup(struct btrfs_root *root, 2920ac8e9819SChris Mason void __user *argp) 2921ac8e9819SChris Mason { 2922ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 292301b810b8SDavid Sterba int ret = 0; 2924ac8e9819SChris Mason 29252354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 29262354d08fSJulia Lawall if (IS_ERR(args)) 29272354d08fSJulia Lawall return PTR_ERR(args); 2928c2b96929SDan Carpenter 292901b810b8SDavid Sterba /* 293001b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 293101b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 293201b810b8SDavid Sterba */ 29331b53ac4dSChris Mason if (args->treeid == 0) 2934dc408ccdSSahil Kang args->treeid = root->root_key.objectid; 29351b53ac4dSChris Mason 293601b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 293701b810b8SDavid Sterba args->name[0] = 0; 293801b810b8SDavid Sterba goto out; 293901b810b8SDavid Sterba } 294001b810b8SDavid Sterba 294101b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 294201b810b8SDavid Sterba ret = -EPERM; 294301b810b8SDavid Sterba goto out; 294401b810b8SDavid Sterba } 294501b810b8SDavid Sterba 2946dc408ccdSSahil Kang ret = btrfs_search_path_in_tree(root->fs_info, 2947ac8e9819SChris Mason args->treeid, args->objectid, 2948ac8e9819SChris Mason args->name); 2949ac8e9819SChris Mason 295001b810b8SDavid Sterba out: 2951ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2952ac8e9819SChris Mason ret = -EFAULT; 2953ac8e9819SChris Mason 2954ac8e9819SChris Mason kfree(args); 295598d377a0STARUISI Hiroaki return ret; 295698d377a0STARUISI Hiroaki } 295798d377a0STARUISI Hiroaki 295823d0b79dSTomohiro Misono /* 295923d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 296023d0b79dSTomohiro Misono * 296123d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 296223d0b79dSTomohiro Misono * 296323d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 296423d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 296523d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 296623d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 296723d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 296823d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 296923d0b79dSTomohiro Misono */ 297023d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 297123d0b79dSTomohiro Misono { 297223d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 297323d0b79dSTomohiro Misono struct inode *inode; 297423d0b79dSTomohiro Misono int ret; 297523d0b79dSTomohiro Misono 297623d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 297723d0b79dSTomohiro Misono if (IS_ERR(args)) 297823d0b79dSTomohiro Misono return PTR_ERR(args); 297923d0b79dSTomohiro Misono 298023d0b79dSTomohiro Misono inode = file_inode(file); 298123d0b79dSTomohiro Misono 298223d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 298323d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 298423d0b79dSTomohiro Misono /* 298523d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 298623d0b79dSTomohiro Misono * called 298723d0b79dSTomohiro Misono */ 298823d0b79dSTomohiro Misono kfree(args); 298923d0b79dSTomohiro Misono return -EACCES; 299023d0b79dSTomohiro Misono } 299123d0b79dSTomohiro Misono 29926623d9a0SChristian Brauner ret = btrfs_search_path_in_tree_user(file_mnt_user_ns(file), inode, args); 299323d0b79dSTomohiro Misono 299423d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 299523d0b79dSTomohiro Misono ret = -EFAULT; 299623d0b79dSTomohiro Misono 299723d0b79dSTomohiro Misono kfree(args); 299823d0b79dSTomohiro Misono return ret; 299923d0b79dSTomohiro Misono } 300023d0b79dSTomohiro Misono 3001b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 30029ad12305SSahil Kang static int btrfs_ioctl_get_subvol_info(struct inode *inode, void __user *argp) 3003b64ec075STomohiro Misono { 3004b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 3005b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 3006b64ec075STomohiro Misono struct btrfs_root *root; 3007b64ec075STomohiro Misono struct btrfs_path *path; 3008b64ec075STomohiro Misono struct btrfs_key key; 3009b64ec075STomohiro Misono struct btrfs_root_item *root_item; 3010b64ec075STomohiro Misono struct btrfs_root_ref *rref; 3011b64ec075STomohiro Misono struct extent_buffer *leaf; 3012b64ec075STomohiro Misono unsigned long item_off; 3013b64ec075STomohiro Misono unsigned long item_len; 3014b64ec075STomohiro Misono int slot; 3015b64ec075STomohiro Misono int ret = 0; 3016b64ec075STomohiro Misono 3017b64ec075STomohiro Misono path = btrfs_alloc_path(); 3018b64ec075STomohiro Misono if (!path) 3019b64ec075STomohiro Misono return -ENOMEM; 3020b64ec075STomohiro Misono 3021b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 3022b64ec075STomohiro Misono if (!subvol_info) { 3023b64ec075STomohiro Misono btrfs_free_path(path); 3024b64ec075STomohiro Misono return -ENOMEM; 3025b64ec075STomohiro Misono } 3026b64ec075STomohiro Misono 3027b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 3028b64ec075STomohiro Misono 3029b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 3030b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 303156e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 3032b64ec075STomohiro Misono if (IS_ERR(root)) { 3033b64ec075STomohiro Misono ret = PTR_ERR(root); 303404734e84SJosef Bacik goto out_free; 303504734e84SJosef Bacik } 3036b64ec075STomohiro Misono root_item = &root->root_item; 3037b64ec075STomohiro Misono 3038b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 3039b64ec075STomohiro Misono 3040b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 3041b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 3042b64ec075STomohiro Misono 3043b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 3044b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 3045b64ec075STomohiro Misono BTRFS_UUID_SIZE); 3046b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 3047b64ec075STomohiro Misono BTRFS_UUID_SIZE); 3048b64ec075STomohiro Misono 3049b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 3050b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 3051b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 3052b64ec075STomohiro Misono 3053b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 3054b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 3055b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 3056b64ec075STomohiro Misono 3057b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 3058b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 3059b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 3060b64ec075STomohiro Misono 3061b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 3062b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 3063b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 3064b64ec075STomohiro Misono 3065b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 3066b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 3067b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 3068b64ec075STomohiro Misono key.offset = 0; 306904734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 3070b64ec075STomohiro Misono if (ret < 0) { 3071b64ec075STomohiro Misono goto out; 3072b64ec075STomohiro Misono } else if (path->slots[0] >= 3073b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 307404734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 3075b64ec075STomohiro Misono if (ret < 0) { 3076b64ec075STomohiro Misono goto out; 3077b64ec075STomohiro Misono } else if (ret > 0) { 3078b64ec075STomohiro Misono ret = -EUCLEAN; 3079b64ec075STomohiro Misono goto out; 3080b64ec075STomohiro Misono } 3081b64ec075STomohiro Misono } 3082b64ec075STomohiro Misono 3083b64ec075STomohiro Misono leaf = path->nodes[0]; 3084b64ec075STomohiro Misono slot = path->slots[0]; 3085b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 3086b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 3087b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 3088b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 3089b64ec075STomohiro Misono 3090b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 3091b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 3092b64ec075STomohiro Misono 3093b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 3094b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 30953212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot) 3096b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 3097b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 3098b64ec075STomohiro Misono item_off, item_len); 3099b64ec075STomohiro Misono } else { 3100b64ec075STomohiro Misono ret = -ENOENT; 3101b64ec075STomohiro Misono goto out; 3102b64ec075STomohiro Misono } 3103b64ec075STomohiro Misono } 3104b64ec075STomohiro Misono 3105b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 3106b64ec075STomohiro Misono ret = -EFAULT; 3107b64ec075STomohiro Misono 3108b64ec075STomohiro Misono out: 310900246528SJosef Bacik btrfs_put_root(root); 311004734e84SJosef Bacik out_free: 3111b64ec075STomohiro Misono btrfs_free_path(path); 3112b091f7feSWaiman Long kfree(subvol_info); 3113b64ec075STomohiro Misono return ret; 3114b64ec075STomohiro Misono } 3115b64ec075STomohiro Misono 311642e4b520STomohiro Misono /* 311742e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 311842e4b520STomohiro Misono * except the subvolume name. 311942e4b520STomohiro Misono */ 31209ad12305SSahil Kang static int btrfs_ioctl_get_subvol_rootref(struct btrfs_root *root, 3121dc408ccdSSahil Kang void __user *argp) 312242e4b520STomohiro Misono { 312342e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 312442e4b520STomohiro Misono struct btrfs_root_ref *rref; 312542e4b520STomohiro Misono struct btrfs_path *path; 312642e4b520STomohiro Misono struct btrfs_key key; 312742e4b520STomohiro Misono struct extent_buffer *leaf; 312842e4b520STomohiro Misono u64 objectid; 312942e4b520STomohiro Misono int slot; 313042e4b520STomohiro Misono int ret; 313142e4b520STomohiro Misono u8 found; 313242e4b520STomohiro Misono 313342e4b520STomohiro Misono path = btrfs_alloc_path(); 313442e4b520STomohiro Misono if (!path) 313542e4b520STomohiro Misono return -ENOMEM; 313642e4b520STomohiro Misono 313742e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 313842e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 313942e4b520STomohiro Misono btrfs_free_path(path); 314042e4b520STomohiro Misono return PTR_ERR(rootrefs); 314142e4b520STomohiro Misono } 314242e4b520STomohiro Misono 31439ad12305SSahil Kang objectid = root->root_key.objectid; 314442e4b520STomohiro Misono key.objectid = objectid; 314542e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 314642e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 314742e4b520STomohiro Misono found = 0; 314842e4b520STomohiro Misono 31499ad12305SSahil Kang root = root->fs_info->tree_root; 315042e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 315142e4b520STomohiro Misono if (ret < 0) { 315242e4b520STomohiro Misono goto out; 315342e4b520STomohiro Misono } else if (path->slots[0] >= 315442e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 315542e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 315642e4b520STomohiro Misono if (ret < 0) { 315742e4b520STomohiro Misono goto out; 315842e4b520STomohiro Misono } else if (ret > 0) { 315942e4b520STomohiro Misono ret = -EUCLEAN; 316042e4b520STomohiro Misono goto out; 316142e4b520STomohiro Misono } 316242e4b520STomohiro Misono } 316342e4b520STomohiro Misono while (1) { 316442e4b520STomohiro Misono leaf = path->nodes[0]; 316542e4b520STomohiro Misono slot = path->slots[0]; 316642e4b520STomohiro Misono 316742e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 316842e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 316942e4b520STomohiro Misono ret = 0; 317042e4b520STomohiro Misono goto out; 317142e4b520STomohiro Misono } 317242e4b520STomohiro Misono 317342e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 317442e4b520STomohiro Misono ret = -EOVERFLOW; 317542e4b520STomohiro Misono goto out; 317642e4b520STomohiro Misono } 317742e4b520STomohiro Misono 317842e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 317942e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 318042e4b520STomohiro Misono rootrefs->rootref[found].dirid = 318142e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 318242e4b520STomohiro Misono found++; 318342e4b520STomohiro Misono 318442e4b520STomohiro Misono ret = btrfs_next_item(root, path); 318542e4b520STomohiro Misono if (ret < 0) { 318642e4b520STomohiro Misono goto out; 318742e4b520STomohiro Misono } else if (ret > 0) { 318842e4b520STomohiro Misono ret = -EUCLEAN; 318942e4b520STomohiro Misono goto out; 319042e4b520STomohiro Misono } 319142e4b520STomohiro Misono } 319242e4b520STomohiro Misono 319342e4b520STomohiro Misono out: 319442e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 319542e4b520STomohiro Misono rootrefs->num_items = found; 319642e4b520STomohiro Misono /* update min_treeid for next search */ 319742e4b520STomohiro Misono if (found) 319842e4b520STomohiro Misono rootrefs->min_treeid = 319942e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 320042e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 320142e4b520STomohiro Misono ret = -EFAULT; 320242e4b520STomohiro Misono } 320342e4b520STomohiro Misono 320442e4b520STomohiro Misono kfree(rootrefs); 320542e4b520STomohiro Misono btrfs_free_path(path); 320642e4b520STomohiro Misono 320742e4b520STomohiro Misono return ret; 320842e4b520STomohiro Misono } 320942e4b520STomohiro Misono 321076dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 3211949964c9SMarcos Paulo de Souza void __user *arg, 3212949964c9SMarcos Paulo de Souza bool destroy_v2) 321376dda93cSYan, Zheng { 321454563d41SAl Viro struct dentry *parent = file->f_path.dentry; 32150b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 321676dda93cSYan, Zheng struct dentry *dentry; 32172b0143b5SDavid Howells struct inode *dir = d_inode(parent); 321876dda93cSYan, Zheng struct inode *inode; 321976dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 322076dda93cSYan, Zheng struct btrfs_root *dest = NULL; 3221949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 3222949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 3223c4ed533bSChristian Brauner struct user_namespace *mnt_userns = file_mnt_user_ns(file); 3224949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 3225949964c9SMarcos Paulo de Souza int subvol_namelen; 322676dda93cSYan, Zheng int err = 0; 3227949964c9SMarcos Paulo de Souza bool destroy_parent = false; 322876dda93cSYan, Zheng 3229813febdbSJosef Bacik /* We don't support snapshots with extent tree v2 yet. */ 3230813febdbSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 3231813febdbSJosef Bacik btrfs_err(fs_info, 3232813febdbSJosef Bacik "extent tree v2 doesn't support snapshot deletion yet"); 3233813febdbSJosef Bacik return -EOPNOTSUPP; 3234813febdbSJosef Bacik } 3235813febdbSJosef Bacik 3236949964c9SMarcos Paulo de Souza if (destroy_v2) { 3237949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 3238949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 3239949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 3240325c50e3SJeff Mahoney 3241949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 3242949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 3243949964c9SMarcos Paulo de Souza goto out; 3244949964c9SMarcos Paulo de Souza } 324576dda93cSYan, Zheng 3246949964c9SMarcos Paulo de Souza /* 3247949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 3248949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 3249949964c9SMarcos Paulo de Souza */ 3250949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 3251949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 3252949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 3253949964c9SMarcos Paulo de Souza 3254949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3255949964c9SMarcos Paulo de Souza if (err) 3256949964c9SMarcos Paulo de Souza goto out; 3257949964c9SMarcos Paulo de Souza } else { 3258aabb34e7SChristian Brauner struct inode *old_dir; 3259c4ed533bSChristian Brauner 3260949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 326176dda93cSYan, Zheng err = -EINVAL; 326276dda93cSYan, Zheng goto out; 326376dda93cSYan, Zheng } 326476dda93cSYan, Zheng 3265a561be71SAl Viro err = mnt_want_write_file(file); 326676dda93cSYan, Zheng if (err) 326776dda93cSYan, Zheng goto out; 326876dda93cSYan, Zheng 3269949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 3270949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 3271949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 3272949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 3273949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 3274949964c9SMarcos Paulo de Souza goto out_drop_write; 3275949964c9SMarcos Paulo de Souza } 3276949964c9SMarcos Paulo de Souza 3277949964c9SMarcos Paulo de Souza /* 3278949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 3279949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 3280949964c9SMarcos Paulo de Souza */ 3281949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 3282949964c9SMarcos Paulo de Souza 3283949964c9SMarcos Paulo de Souza /* 3284949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 3285949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 3286949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 3287949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 3288949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 3289949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 3290949964c9SMarcos Paulo de Souza */ 3291949964c9SMarcos Paulo de Souza dput(dentry); 3292949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 3293949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 3294949964c9SMarcos Paulo de Souza goto out_drop_write; 3295949964c9SMarcos Paulo de Souza } 3296aabb34e7SChristian Brauner old_dir = dir; 3297949964c9SMarcos Paulo de Souza dir = d_inode(parent); 3298949964c9SMarcos Paulo de Souza 3299949964c9SMarcos Paulo de Souza /* 3300949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 3301949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 3302949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 3303949964c9SMarcos Paulo de Souza * new parent dentry. 3304949964c9SMarcos Paulo de Souza */ 3305949964c9SMarcos Paulo de Souza destroy_parent = true; 3306949964c9SMarcos Paulo de Souza 3307aabb34e7SChristian Brauner /* 3308aabb34e7SChristian Brauner * On idmapped mounts, deletion via subvolid is 3309aabb34e7SChristian Brauner * restricted to subvolumes that are immediate 3310aabb34e7SChristian Brauner * ancestors of the inode referenced by the file 3311aabb34e7SChristian Brauner * descriptor in the ioctl. Otherwise the idmapping 3312aabb34e7SChristian Brauner * could potentially be abused to delete subvolumes 3313aabb34e7SChristian Brauner * anywhere in the filesystem the user wouldn't be able 3314aabb34e7SChristian Brauner * to delete without an idmapped mount. 3315aabb34e7SChristian Brauner */ 3316aabb34e7SChristian Brauner if (old_dir != dir && mnt_userns != &init_user_ns) { 3317aabb34e7SChristian Brauner err = -EOPNOTSUPP; 3318aabb34e7SChristian Brauner goto free_parent; 3319aabb34e7SChristian Brauner } 3320aabb34e7SChristian Brauner 3321949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 3322949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 3323949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 3324949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 3325949964c9SMarcos Paulo de Souza goto free_parent; 3326949964c9SMarcos Paulo de Souza } 33271a9fd417SDavid Sterba /* subvol_name_ptr is already nul terminated */ 3328949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 3329949964c9SMarcos Paulo de Souza } 3330949964c9SMarcos Paulo de Souza } else { 3331949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 3332949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 3333949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 3334949964c9SMarcos Paulo de Souza 3335949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 3336949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 3337949964c9SMarcos Paulo de Souza 3338949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3339949964c9SMarcos Paulo de Souza if (err) 3340949964c9SMarcos Paulo de Souza goto out; 3341949964c9SMarcos Paulo de Souza } 3342949964c9SMarcos Paulo de Souza 3343949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 3344949964c9SMarcos Paulo de Souza 3345949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 3346949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 3347949964c9SMarcos Paulo de Souza err = -EINVAL; 3348949964c9SMarcos Paulo de Souza goto free_subvol_name; 3349949964c9SMarcos Paulo de Souza } 3350949964c9SMarcos Paulo de Souza 3351949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 3352949964c9SMarcos Paulo de Souza err = -ENOTDIR; 3353949964c9SMarcos Paulo de Souza goto free_subvol_name; 3354949964c9SMarcos Paulo de Souza } 3355521e0546SDavid Sterba 335600235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 335700235411SAl Viro if (err == -EINTR) 3358949964c9SMarcos Paulo de Souza goto free_subvol_name; 3359c4ed533bSChristian Brauner dentry = lookup_one(mnt_userns, subvol_name, parent, subvol_namelen); 336076dda93cSYan, Zheng if (IS_ERR(dentry)) { 336176dda93cSYan, Zheng err = PTR_ERR(dentry); 336276dda93cSYan, Zheng goto out_unlock_dir; 336376dda93cSYan, Zheng } 336476dda93cSYan, Zheng 33652b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 336676dda93cSYan, Zheng err = -ENOENT; 336776dda93cSYan, Zheng goto out_dput; 336876dda93cSYan, Zheng } 336976dda93cSYan, Zheng 33702b0143b5SDavid Howells inode = d_inode(dentry); 33714260f7c7SSage Weil dest = BTRFS_I(inode)->root; 33724260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 33734260f7c7SSage Weil /* 33744260f7c7SSage Weil * Regular user. Only allow this with a special mount 33754260f7c7SSage Weil * option, when the user has write+exec access to the 33764260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 33774260f7c7SSage Weil * allowed. 33784260f7c7SSage Weil * 33794260f7c7SSage Weil * Note that this is _not_ check that the subvol is 33804260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 33814260f7c7SSage Weil * otherwise be able to delete. 33824260f7c7SSage Weil * 33834260f7c7SSage Weil * Users who want to delete empty subvols should try 33844260f7c7SSage Weil * rmdir(2). 33854260f7c7SSage Weil */ 33864260f7c7SSage Weil err = -EPERM; 33870b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 33884260f7c7SSage Weil goto out_dput; 33894260f7c7SSage Weil 33904260f7c7SSage Weil /* 33914260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 33924260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 33934260f7c7SSage Weil * must be called on the dentry referencing the root 33944260f7c7SSage Weil * of the subvol, not a random directory contained 33954260f7c7SSage Weil * within it. 33964260f7c7SSage Weil */ 33974260f7c7SSage Weil err = -EINVAL; 33984260f7c7SSage Weil if (root == dest) 33994260f7c7SSage Weil goto out_dput; 34004260f7c7SSage Weil 3401c4ed533bSChristian Brauner err = inode_permission(mnt_userns, inode, MAY_WRITE | MAY_EXEC); 34024260f7c7SSage Weil if (err) 34034260f7c7SSage Weil goto out_dput; 34045c39da5bSMiao Xie } 34054260f7c7SSage Weil 34065c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 3407c4ed533bSChristian Brauner err = btrfs_may_delete(mnt_userns, dir, dentry, 1); 34084260f7c7SSage Weil if (err) 34094260f7c7SSage Weil goto out_dput; 34104260f7c7SSage Weil 34114a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 341276dda93cSYan, Zheng err = -EINVAL; 341376dda93cSYan, Zheng goto out_dput; 341476dda93cSYan, Zheng } 341576dda93cSYan, Zheng 341664708539SJosef Bacik btrfs_inode_lock(inode, 0); 3417f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 341864708539SJosef Bacik btrfs_inode_unlock(inode, 0); 3419a37d9a17SAmir Goldstein if (!err) 3420a37d9a17SAmir Goldstein d_delete_notify(dir, dentry); 3421fa6ac876SLiu Bo 342276dda93cSYan, Zheng out_dput: 342376dda93cSYan, Zheng dput(dentry); 342476dda93cSYan, Zheng out_unlock_dir: 342564708539SJosef Bacik btrfs_inode_unlock(dir, 0); 3426949964c9SMarcos Paulo de Souza free_subvol_name: 3427949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3428949964c9SMarcos Paulo de Souza free_parent: 3429949964c9SMarcos Paulo de Souza if (destroy_parent) 3430949964c9SMarcos Paulo de Souza dput(parent); 343100235411SAl Viro out_drop_write: 34322a79f17eSAl Viro mnt_drop_write_file(file); 343376dda93cSYan, Zheng out: 3434949964c9SMarcos Paulo de Souza kfree(vol_args2); 343576dda93cSYan, Zheng kfree(vol_args); 343676dda93cSYan, Zheng return err; 343776dda93cSYan, Zheng } 343876dda93cSYan, Zheng 34391e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3440f46b5a66SChristoph Hellwig { 3441496ad9aaSAl Viro struct inode *inode = file_inode(file); 3442f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3443c853a578SGoldwyn Rodrigues struct btrfs_ioctl_defrag_range_args range = {0}; 3444c146afadSYan Zheng int ret; 3445c146afadSYan Zheng 344625122d15SIlya Dryomov ret = mnt_want_write_file(file); 344725122d15SIlya Dryomov if (ret) 344825122d15SIlya Dryomov return ret; 3449b83cc969SLi Zefan 345025122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 345125122d15SIlya Dryomov ret = -EROFS; 345225122d15SIlya Dryomov goto out; 34535ac00addSStefan Behrens } 3454f46b5a66SChristoph Hellwig 3455f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3456f46b5a66SChristoph Hellwig case S_IFDIR: 3457e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3458e441d54dSChris Mason ret = -EPERM; 3459e441d54dSChris Mason goto out; 3460e441d54dSChris Mason } 3461de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3462f46b5a66SChristoph Hellwig break; 3463f46b5a66SChristoph Hellwig case S_IFREG: 3464616d374eSAdam Borowski /* 3465616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3466616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3467616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3468616d374eSAdam Borowski */ 3469616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 347047291baaSChristian Brauner inode_permission(&init_user_ns, inode, MAY_WRITE)) { 3471616d374eSAdam Borowski ret = -EPERM; 3472e441d54dSChris Mason goto out; 3473e441d54dSChris Mason } 34741e701a32SChris Mason 34751e701a32SChris Mason if (argp) { 3476c853a578SGoldwyn Rodrigues if (copy_from_user(&range, argp, sizeof(range))) { 34771e701a32SChris Mason ret = -EFAULT; 3478683be16eSDan Carpenter goto out; 34791e701a32SChris Mason } 34801e701a32SChris Mason /* compression requires us to start the IO */ 3481c853a578SGoldwyn Rodrigues if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 3482c853a578SGoldwyn Rodrigues range.flags |= BTRFS_DEFRAG_RANGE_START_IO; 3483c853a578SGoldwyn Rodrigues range.extent_thresh = (u32)-1; 34841e701a32SChris Mason } 34851e701a32SChris Mason } else { 34861e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 3487c853a578SGoldwyn Rodrigues range.len = (u64)-1; 34881e701a32SChris Mason } 34891ccc2e8aSQu Wenruo ret = btrfs_defrag_file(file_inode(file), &file->f_ra, 3490c853a578SGoldwyn Rodrigues &range, BTRFS_OLDEST_GENERATION, 0); 34914cb5300bSChris Mason if (ret > 0) 34924cb5300bSChris Mason ret = 0; 3493f46b5a66SChristoph Hellwig break; 34948929ecfaSYan, Zheng default: 34958929ecfaSYan, Zheng ret = -EINVAL; 3496f46b5a66SChristoph Hellwig } 3497e441d54dSChris Mason out: 349825122d15SIlya Dryomov mnt_drop_write_file(file); 3499e441d54dSChris Mason return ret; 3500f46b5a66SChristoph Hellwig } 3501f46b5a66SChristoph Hellwig 35022ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3503f46b5a66SChristoph Hellwig { 3504f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3505a174c0a2SNikolay Borisov bool restore_op = false; 3506f46b5a66SChristoph Hellwig int ret; 3507f46b5a66SChristoph Hellwig 3508e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3509e441d54dSChris Mason return -EPERM; 3510e441d54dSChris Mason 3511914a519bSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 3512914a519bSJosef Bacik btrfs_err(fs_info, "device add not supported on extent tree v2 yet"); 3513914a519bSJosef Bacik return -EINVAL; 3514914a519bSJosef Bacik } 3515914a519bSJosef Bacik 3516a174c0a2SNikolay Borisov if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) { 3517a174c0a2SNikolay Borisov if (!btrfs_exclop_start_try_lock(fs_info, BTRFS_EXCLOP_DEV_ADD)) 3518e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3519c9e9f97bSIlya Dryomov 3520a174c0a2SNikolay Borisov /* 3521a174c0a2SNikolay Borisov * We can do the device add because we have a paused balanced, 3522a174c0a2SNikolay Borisov * change the exclusive op type and remember we should bring 3523a174c0a2SNikolay Borisov * back the paused balance 3524a174c0a2SNikolay Borisov */ 3525a174c0a2SNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_DEV_ADD; 3526a174c0a2SNikolay Borisov btrfs_exclop_start_unlock(fs_info); 3527a174c0a2SNikolay Borisov restore_op = true; 3528a174c0a2SNikolay Borisov } 3529a174c0a2SNikolay Borisov 3530dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3531c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3532c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3533c9e9f97bSIlya Dryomov goto out; 3534c9e9f97bSIlya Dryomov } 3535f46b5a66SChristoph Hellwig 35365516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 35372ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3538f46b5a66SChristoph Hellwig 353943d20761SAnand Jain if (!ret) 35400b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 354143d20761SAnand Jain 3542f46b5a66SChristoph Hellwig kfree(vol_args); 3543c9e9f97bSIlya Dryomov out: 3544a174c0a2SNikolay Borisov if (restore_op) 3545a174c0a2SNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED); 3546a174c0a2SNikolay Borisov else 3547c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3548f46b5a66SChristoph Hellwig return ret; 3549f46b5a66SChristoph Hellwig } 3550f46b5a66SChristoph Hellwig 35516b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3552f46b5a66SChristoph Hellwig { 35531a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 35540b246afaSJeff Mahoney struct inode *inode = file_inode(file); 35550b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 35566b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 35573fa421deSJosef Bacik struct block_device *bdev = NULL; 35583fa421deSJosef Bacik fmode_t mode; 3559f46b5a66SChristoph Hellwig int ret; 356067ae34b6SDavid Sterba bool cancel = false; 3561f46b5a66SChristoph Hellwig 3562e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3563e441d54dSChris Mason return -EPERM; 3564e441d54dSChris Mason 3565dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3566d815b3f2SDan Carpenter if (IS_ERR(vol_args)) 3567d815b3f2SDan Carpenter return PTR_ERR(vol_args); 3568f46b5a66SChristoph Hellwig 3569748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3570fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3571fd4e994bSOmar Sandoval goto out; 3572fd4e994bSOmar Sandoval } 35731a15eb72SJosef Bacik 35746b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 35751a15eb72SJosef Bacik if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 35761a15eb72SJosef Bacik args.devid = vol_args->devid; 35771a15eb72SJosef Bacik } else if (!strcmp("cancel", vol_args->name)) { 357867ae34b6SDavid Sterba cancel = true; 35791a15eb72SJosef Bacik } else { 35801a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 35811a15eb72SJosef Bacik if (ret) 35821a15eb72SJosef Bacik goto out; 35831a15eb72SJosef Bacik } 35841a15eb72SJosef Bacik 35851a15eb72SJosef Bacik ret = mnt_want_write_file(file); 35861a15eb72SJosef Bacik if (ret) 35871a15eb72SJosef Bacik goto out; 358867ae34b6SDavid Sterba 358967ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 359067ae34b6SDavid Sterba cancel); 359167ae34b6SDavid Sterba if (ret) 35921a15eb72SJosef Bacik goto err_drop; 359367ae34b6SDavid Sterba 35941a15eb72SJosef Bacik /* Exclusive operation is now claimed */ 35951a15eb72SJosef Bacik ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); 359667ae34b6SDavid Sterba 3597c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3598183860f6SAnand Jain 35996b526ed7SAnand Jain if (!ret) { 3600735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 36010b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 36026b526ed7SAnand Jain vol_args->devid); 36036b526ed7SAnand Jain else 36040b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 36056b526ed7SAnand Jain vol_args->name); 36066b526ed7SAnand Jain } 3607c47ca32dSDan Carpenter err_drop: 36084ac20c70SIlya Dryomov mnt_drop_write_file(file); 36093fa421deSJosef Bacik if (bdev) 36103fa421deSJosef Bacik blkdev_put(bdev, mode); 36111a15eb72SJosef Bacik out: 36121a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 36131a15eb72SJosef Bacik kfree(vol_args); 3614f46b5a66SChristoph Hellwig return ret; 3615f46b5a66SChristoph Hellwig } 3616f46b5a66SChristoph Hellwig 3617f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3618f46b5a66SChristoph Hellwig { 36191a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 36200b246afaSJeff Mahoney struct inode *inode = file_inode(file); 36210b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3622f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 36233fa421deSJosef Bacik struct block_device *bdev = NULL; 36243fa421deSJosef Bacik fmode_t mode; 3625f46b5a66SChristoph Hellwig int ret; 362637b45995STom Rix bool cancel = false; 3627f46b5a66SChristoph Hellwig 3628f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3629f46b5a66SChristoph Hellwig return -EPERM; 3630f46b5a66SChristoph Hellwig 36311a15eb72SJosef Bacik vol_args = memdup_user(arg, sizeof(*vol_args)); 36321a15eb72SJosef Bacik if (IS_ERR(vol_args)) 36331a15eb72SJosef Bacik return PTR_ERR(vol_args); 36341a15eb72SJosef Bacik 36351a15eb72SJosef Bacik vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 36361a15eb72SJosef Bacik if (!strcmp("cancel", vol_args->name)) { 36371a15eb72SJosef Bacik cancel = true; 36381a15eb72SJosef Bacik } else { 36391a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 36401a15eb72SJosef Bacik if (ret) 36411a15eb72SJosef Bacik goto out; 36421a15eb72SJosef Bacik } 36431a15eb72SJosef Bacik 3644f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3645f46b5a66SChristoph Hellwig if (ret) 36461a15eb72SJosef Bacik goto out; 3647f46b5a66SChristoph Hellwig 364867ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 364967ae34b6SDavid Sterba cancel); 365067ae34b6SDavid Sterba if (ret == 0) { 36511a15eb72SJosef Bacik ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); 3652f46b5a66SChristoph Hellwig if (!ret) 36530b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3654c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 365567ae34b6SDavid Sterba } 365667ae34b6SDavid Sterba 3657f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 36583fa421deSJosef Bacik if (bdev) 36593fa421deSJosef Bacik blkdev_put(bdev, mode); 36601a15eb72SJosef Bacik out: 36611a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 36621a15eb72SJosef Bacik kfree(vol_args); 3663f46b5a66SChristoph Hellwig return ret; 3664f46b5a66SChristoph Hellwig } 3665f46b5a66SChristoph Hellwig 36662ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 36672ff7e61eSJeff Mahoney void __user *arg) 3668475f6387SJan Schmidt { 3669027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3670475f6387SJan Schmidt struct btrfs_device *device; 36710b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3672137c5418SJohannes Thumshirn u64 flags_in; 3673027ed2f0SLi Zefan int ret = 0; 3674475f6387SJan Schmidt 3675137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3676137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3677137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3678137c5418SJohannes Thumshirn 3679137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3680137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3681027ed2f0SLi Zefan 3682d03262c7SDavid Sterba rcu_read_lock(); 3683027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3684475f6387SJan Schmidt 3685d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3686027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3687027ed2f0SLi Zefan fi_args->max_id = device->devid; 3688475f6387SJan Schmidt } 3689d03262c7SDavid Sterba rcu_read_unlock(); 3690475f6387SJan Schmidt 3691de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3692bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3693bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3694bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 369580a773fbSDavid Sterba 3696137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3697137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3698137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3699137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3700137c5418SJohannes Thumshirn } 3701137c5418SJohannes Thumshirn 37020fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 37030fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 37040fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 37050fb408a5SJohannes Thumshirn } 37060fb408a5SJohannes Thumshirn 370749bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 370849bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 370949bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 371049bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 371149bac897SJohannes Thumshirn } 371249bac897SJohannes Thumshirn 3713027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3714027ed2f0SLi Zefan ret = -EFAULT; 3715475f6387SJan Schmidt 3716027ed2f0SLi Zefan kfree(fi_args); 3717027ed2f0SLi Zefan return ret; 3718475f6387SJan Schmidt } 3719475f6387SJan Schmidt 37202ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 37212ff7e61eSJeff Mahoney void __user *arg) 3722475f6387SJan Schmidt { 3723562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 3724475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3725475f6387SJan Schmidt struct btrfs_device *dev; 3726475f6387SJan Schmidt int ret = 0; 3727475f6387SJan Schmidt 3728475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3729475f6387SJan Schmidt if (IS_ERR(di_args)) 3730475f6387SJan Schmidt return PTR_ERR(di_args); 3731475f6387SJan Schmidt 3732562d7b15SJosef Bacik args.devid = di_args->devid; 3733dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3734562d7b15SJosef Bacik args.uuid = di_args->uuid; 3735475f6387SJan Schmidt 3736c5593ca3SDavid Sterba rcu_read_lock(); 3737562d7b15SJosef Bacik dev = btrfs_find_device(fs_info->fs_devices, &args); 3738475f6387SJan Schmidt if (!dev) { 3739475f6387SJan Schmidt ret = -ENODEV; 3740475f6387SJan Schmidt goto out; 3741475f6387SJan Schmidt } 3742475f6387SJan Schmidt 3743475f6387SJan Schmidt di_args->devid = dev->devid; 37447cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 37457cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3746475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3747a27202fbSJim Meyering if (dev->name) { 3748672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3749672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3750a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3751a27202fbSJim Meyering } else { 375299ba55adSStefan Behrens di_args->path[0] = '\0'; 3753a27202fbSJim Meyering } 3754475f6387SJan Schmidt 3755475f6387SJan Schmidt out: 3756c5593ca3SDavid Sterba rcu_read_unlock(); 3757475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3758475f6387SJan Schmidt ret = -EFAULT; 3759475f6387SJan Schmidt 3760475f6387SJan Schmidt kfree(di_args); 3761475f6387SJan Schmidt return ret; 3762475f6387SJan Schmidt } 3763475f6387SJan Schmidt 37646ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 37656ef5ed0dSJosef Bacik { 3766496ad9aaSAl Viro struct inode *inode = file_inode(file); 37670b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 37686ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 37696ef5ed0dSJosef Bacik struct btrfs_root *new_root; 37706ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 37716ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 37722a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 37736ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 37746ef5ed0dSJosef Bacik u64 objectid = 0; 37756ef5ed0dSJosef Bacik u64 dir_id; 37763c04ce01SMiao Xie int ret; 37776ef5ed0dSJosef Bacik 37786ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 37796ef5ed0dSJosef Bacik return -EPERM; 37806ef5ed0dSJosef Bacik 37813c04ce01SMiao Xie ret = mnt_want_write_file(file); 37823c04ce01SMiao Xie if (ret) 37833c04ce01SMiao Xie return ret; 37843c04ce01SMiao Xie 37853c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 37863c04ce01SMiao Xie ret = -EFAULT; 37873c04ce01SMiao Xie goto out; 37883c04ce01SMiao Xie } 37896ef5ed0dSJosef Bacik 37906ef5ed0dSJosef Bacik if (!objectid) 37911cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 37926ef5ed0dSJosef Bacik 379356e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 37943c04ce01SMiao Xie if (IS_ERR(new_root)) { 37953c04ce01SMiao Xie ret = PTR_ERR(new_root); 37963c04ce01SMiao Xie goto out; 37973c04ce01SMiao Xie } 37982a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 37992a2b5d62SJosef Bacik ret = -ENOENT; 38002a2b5d62SJosef Bacik goto out_free; 38012a2b5d62SJosef Bacik } 38026ef5ed0dSJosef Bacik 38036ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 38043c04ce01SMiao Xie if (!path) { 38053c04ce01SMiao Xie ret = -ENOMEM; 38062a2b5d62SJosef Bacik goto out_free; 38073c04ce01SMiao Xie } 38086ef5ed0dSJosef Bacik 38096ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 381098d5dc13STsutomu Itoh if (IS_ERR(trans)) { 38113c04ce01SMiao Xie ret = PTR_ERR(trans); 38122a2b5d62SJosef Bacik goto out_free; 38136ef5ed0dSJosef Bacik } 38146ef5ed0dSJosef Bacik 38150b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 38160b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 38176ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3818cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 38192a2b5d62SJosef Bacik btrfs_release_path(path); 38203a45bb20SJeff Mahoney btrfs_end_transaction(trans); 38210b246afaSJeff Mahoney btrfs_err(fs_info, 38225d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 38233c04ce01SMiao Xie ret = -ENOENT; 38242a2b5d62SJosef Bacik goto out_free; 38256ef5ed0dSJosef Bacik } 38266ef5ed0dSJosef Bacik 38276ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 38286ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 38296ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 38302a2b5d62SJosef Bacik btrfs_release_path(path); 38316ef5ed0dSJosef Bacik 38320b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 38333a45bb20SJeff Mahoney btrfs_end_transaction(trans); 38342a2b5d62SJosef Bacik out_free: 383500246528SJosef Bacik btrfs_put_root(new_root); 38362a2b5d62SJosef Bacik btrfs_free_path(path); 38373c04ce01SMiao Xie out: 38383c04ce01SMiao Xie mnt_drop_write_file(file); 38393c04ce01SMiao Xie return ret; 38406ef5ed0dSJosef Bacik } 38416ef5ed0dSJosef Bacik 3842c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3843bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3844bf5fc093SJosef Bacik { 384532da5386SDavid Sterba struct btrfs_block_group *block_group; 3846bf5fc093SJosef Bacik 3847bf5fc093SJosef Bacik space->total_bytes = 0; 3848bf5fc093SJosef Bacik space->used_bytes = 0; 3849bf5fc093SJosef Bacik space->flags = 0; 3850bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3851bf5fc093SJosef Bacik space->flags = block_group->flags; 3852b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3853bf38be65SDavid Sterba space->used_bytes += block_group->used; 3854bf5fc093SJosef Bacik } 3855bf5fc093SJosef Bacik } 3856bf5fc093SJosef Bacik 38572ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 38582ff7e61eSJeff Mahoney void __user *arg) 38591406e432SJosef Bacik { 38601406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 38611406e432SJosef Bacik struct btrfs_ioctl_space_info space; 38621406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 38637fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 386413f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 38651406e432SJosef Bacik struct btrfs_space_info *info; 3866315d8e98SColin Ian King static const u64 types[] = { 3867315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3868bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3869bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3870315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3871315d8e98SColin Ian King }; 3872bf5fc093SJosef Bacik int num_types = 4; 38737fde62bfSChris Mason int alloc_size; 38741406e432SJosef Bacik int ret = 0; 387551788b1bSDan Rosenberg u64 slot_count = 0; 3876bf5fc093SJosef Bacik int i, c; 38771406e432SJosef Bacik 38781406e432SJosef Bacik if (copy_from_user(&space_args, 38791406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 38801406e432SJosef Bacik sizeof(space_args))) 38811406e432SJosef Bacik return -EFAULT; 38821406e432SJosef Bacik 3883bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3884bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3885bf5fc093SJosef Bacik 3886bf5fc093SJosef Bacik info = NULL; 388772804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3888bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3889bf5fc093SJosef Bacik info = tmp; 3890bf5fc093SJosef Bacik break; 3891bf5fc093SJosef Bacik } 3892bf5fc093SJosef Bacik } 38931406e432SJosef Bacik 3894bf5fc093SJosef Bacik if (!info) 3895bf5fc093SJosef Bacik continue; 3896bf5fc093SJosef Bacik 3897bf5fc093SJosef Bacik down_read(&info->groups_sem); 3898bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3899bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3900bf5fc093SJosef Bacik slot_count++; 3901bf5fc093SJosef Bacik } 3902bf5fc093SJosef Bacik up_read(&info->groups_sem); 3903bf5fc093SJosef Bacik } 3904bf5fc093SJosef Bacik 390536523e95SDavid Sterba /* 390636523e95SDavid Sterba * Global block reserve, exported as a space_info 390736523e95SDavid Sterba */ 390836523e95SDavid Sterba slot_count++; 390936523e95SDavid Sterba 39107fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 39117fde62bfSChris Mason if (space_args.space_slots == 0) { 39127fde62bfSChris Mason space_args.total_spaces = slot_count; 39137fde62bfSChris Mason goto out; 39147fde62bfSChris Mason } 3915bf5fc093SJosef Bacik 391651788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3917bf5fc093SJosef Bacik 39187fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3919bf5fc093SJosef Bacik 39207fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 39217fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 39227fde62bfSChris Mason */ 392309cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 39247fde62bfSChris Mason return -ENOMEM; 39257fde62bfSChris Mason 39267fde62bfSChris Mason space_args.total_spaces = 0; 39278d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 39287fde62bfSChris Mason if (!dest) 39297fde62bfSChris Mason return -ENOMEM; 39307fde62bfSChris Mason dest_orig = dest; 39317fde62bfSChris Mason 39327fde62bfSChris Mason /* now we have a buffer to copy into */ 3933bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3934bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3935bf5fc093SJosef Bacik 393651788b1bSDan Rosenberg if (!slot_count) 393751788b1bSDan Rosenberg break; 393851788b1bSDan Rosenberg 3939bf5fc093SJosef Bacik info = NULL; 394072804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3941bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3942bf5fc093SJosef Bacik info = tmp; 39437fde62bfSChris Mason break; 3944bf5fc093SJosef Bacik } 3945bf5fc093SJosef Bacik } 39467fde62bfSChris Mason 3947bf5fc093SJosef Bacik if (!info) 3948bf5fc093SJosef Bacik continue; 3949bf5fc093SJosef Bacik down_read(&info->groups_sem); 3950bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3951bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3952c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3953c065f5b1SSu Yue &space); 39547fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 39551406e432SJosef Bacik dest++; 39561406e432SJosef Bacik space_args.total_spaces++; 395751788b1bSDan Rosenberg slot_count--; 39581406e432SJosef Bacik } 395951788b1bSDan Rosenberg if (!slot_count) 396051788b1bSDan Rosenberg break; 3961bf5fc093SJosef Bacik } 3962bf5fc093SJosef Bacik up_read(&info->groups_sem); 3963bf5fc093SJosef Bacik } 39641406e432SJosef Bacik 396536523e95SDavid Sterba /* 396636523e95SDavid Sterba * Add global block reserve 396736523e95SDavid Sterba */ 396836523e95SDavid Sterba if (slot_count) { 39690b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 397036523e95SDavid Sterba 397136523e95SDavid Sterba spin_lock(&block_rsv->lock); 397236523e95SDavid Sterba space.total_bytes = block_rsv->size; 397336523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 397436523e95SDavid Sterba spin_unlock(&block_rsv->lock); 397536523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 397636523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 397736523e95SDavid Sterba space_args.total_spaces++; 397836523e95SDavid Sterba } 397936523e95SDavid Sterba 39802eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 39817fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 39827fde62bfSChris Mason 39837fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 39847fde62bfSChris Mason ret = -EFAULT; 39857fde62bfSChris Mason 39867fde62bfSChris Mason kfree(dest_orig); 39877fde62bfSChris Mason out: 39887fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 39891406e432SJosef Bacik ret = -EFAULT; 39901406e432SJosef Bacik 39911406e432SJosef Bacik return ret; 39921406e432SJosef Bacik } 39931406e432SJosef Bacik 39949a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 39959a8c28beSMiao Xie void __user *argp) 399646204592SSage Weil { 399746204592SSage Weil struct btrfs_trans_handle *trans; 399846204592SSage Weil u64 transid; 399946204592SSage Weil 4000d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 4001ff7c1d33SMiao Xie if (IS_ERR(trans)) { 4002ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 400398d5dc13STsutomu Itoh return PTR_ERR(trans); 4004ff7c1d33SMiao Xie 4005ff7c1d33SMiao Xie /* No running transaction, don't bother */ 4006ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 4007ff7c1d33SMiao Xie goto out; 4008ff7c1d33SMiao Xie } 400946204592SSage Weil transid = trans->transid; 4010fdfbf020SJosef Bacik btrfs_commit_transaction_async(trans); 4011ff7c1d33SMiao Xie out: 401246204592SSage Weil if (argp) 401346204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 401446204592SSage Weil return -EFAULT; 401546204592SSage Weil return 0; 401646204592SSage Weil } 401746204592SSage Weil 40182ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 40199a8c28beSMiao Xie void __user *argp) 402046204592SSage Weil { 402146204592SSage Weil u64 transid; 402246204592SSage Weil 402346204592SSage Weil if (argp) { 402446204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 402546204592SSage Weil return -EFAULT; 402646204592SSage Weil } else { 402746204592SSage Weil transid = 0; /* current trans */ 402846204592SSage Weil } 40292ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 403046204592SSage Weil } 403146204592SSage Weil 4032b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 4033475f6387SJan Schmidt { 40340b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 4035475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4036b8e95489SMiao Xie int ret; 4037475f6387SJan Schmidt 4038475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4039475f6387SJan Schmidt return -EPERM; 4040475f6387SJan Schmidt 4041da32c6d5SJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 4042da32c6d5SJosef Bacik btrfs_err(fs_info, "scrub is not supported on extent tree v2 yet"); 4043da32c6d5SJosef Bacik return -EINVAL; 4044da32c6d5SJosef Bacik } 4045da32c6d5SJosef Bacik 4046475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4047475f6387SJan Schmidt if (IS_ERR(sa)) 4048475f6387SJan Schmidt return PTR_ERR(sa); 4049475f6387SJan Schmidt 4050b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 4051b8e95489SMiao Xie ret = mnt_want_write_file(file); 4052b8e95489SMiao Xie if (ret) 4053b8e95489SMiao Xie goto out; 4054b8e95489SMiao Xie } 4055b8e95489SMiao Xie 40560b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 405763a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 405863a212abSStefan Behrens 0); 4059475f6387SJan Schmidt 40605afe6ce7SFilipe Manana /* 40615afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 40625afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 40635afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 40645afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 40655afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 40665afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 40675afe6ce7SFilipe Manana * previously (btrfs-progs does this). 40685afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 40695afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 40705afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 40715afe6ce7SFilipe Manana */ 40725afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 4073475f6387SJan Schmidt ret = -EFAULT; 4074475f6387SJan Schmidt 4075b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 4076b8e95489SMiao Xie mnt_drop_write_file(file); 4077b8e95489SMiao Xie out: 4078475f6387SJan Schmidt kfree(sa); 4079475f6387SJan Schmidt return ret; 4080475f6387SJan Schmidt } 4081475f6387SJan Schmidt 40822ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 4083475f6387SJan Schmidt { 4084475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4085475f6387SJan Schmidt return -EPERM; 4086475f6387SJan Schmidt 40872ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 4088475f6387SJan Schmidt } 4089475f6387SJan Schmidt 40902ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 4091475f6387SJan Schmidt void __user *arg) 4092475f6387SJan Schmidt { 4093475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4094475f6387SJan Schmidt int ret; 4095475f6387SJan Schmidt 4096475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4097475f6387SJan Schmidt return -EPERM; 4098475f6387SJan Schmidt 4099475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4100475f6387SJan Schmidt if (IS_ERR(sa)) 4101475f6387SJan Schmidt return PTR_ERR(sa); 4102475f6387SJan Schmidt 41032ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 4104475f6387SJan Schmidt 41054fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 4106475f6387SJan Schmidt ret = -EFAULT; 4107475f6387SJan Schmidt 4108475f6387SJan Schmidt kfree(sa); 4109475f6387SJan Schmidt return ret; 4110475f6387SJan Schmidt } 4111475f6387SJan Schmidt 41122ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 4113b27f7c0cSDavid Sterba void __user *arg) 4114c11d2c23SStefan Behrens { 4115c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 4116c11d2c23SStefan Behrens int ret; 4117c11d2c23SStefan Behrens 4118c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 4119c11d2c23SStefan Behrens if (IS_ERR(sa)) 4120c11d2c23SStefan Behrens return PTR_ERR(sa); 4121c11d2c23SStefan Behrens 4122b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 4123b27f7c0cSDavid Sterba kfree(sa); 4124b27f7c0cSDavid Sterba return -EPERM; 4125b27f7c0cSDavid Sterba } 4126b27f7c0cSDavid Sterba 41272ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 4128c11d2c23SStefan Behrens 4129eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 4130c11d2c23SStefan Behrens ret = -EFAULT; 4131c11d2c23SStefan Behrens 4132c11d2c23SStefan Behrens kfree(sa); 4133c11d2c23SStefan Behrens return ret; 4134c11d2c23SStefan Behrens } 4135c11d2c23SStefan Behrens 41362ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 41372ff7e61eSJeff Mahoney void __user *arg) 41383f6bcfbdSStefan Behrens { 41393f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 41403f6bcfbdSStefan Behrens int ret; 41413f6bcfbdSStefan Behrens 41423f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 41433f6bcfbdSStefan Behrens return -EPERM; 41443f6bcfbdSStefan Behrens 4145914a519bSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 4146914a519bSJosef Bacik btrfs_err(fs_info, "device replace not supported on extent tree v2 yet"); 4147914a519bSJosef Bacik return -EINVAL; 4148914a519bSJosef Bacik } 4149914a519bSJosef Bacik 41503f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 41513f6bcfbdSStefan Behrens if (IS_ERR(p)) 41523f6bcfbdSStefan Behrens return PTR_ERR(p); 41533f6bcfbdSStefan Behrens 41543f6bcfbdSStefan Behrens switch (p->cmd) { 41553f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 4156bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 4157adfa97cbSIlya Dryomov ret = -EROFS; 4158adfa97cbSIlya Dryomov goto out; 4159adfa97cbSIlya Dryomov } 4160c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 4161e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 41623f6bcfbdSStefan Behrens } else { 41632ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 4164c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 41653f6bcfbdSStefan Behrens } 41663f6bcfbdSStefan Behrens break; 41673f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 41680b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 41693f6bcfbdSStefan Behrens ret = 0; 41703f6bcfbdSStefan Behrens break; 41713f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 417217d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 417397282031SAnand Jain ret = 0; 41743f6bcfbdSStefan Behrens break; 41753f6bcfbdSStefan Behrens default: 41763f6bcfbdSStefan Behrens ret = -EINVAL; 41773f6bcfbdSStefan Behrens break; 41783f6bcfbdSStefan Behrens } 41793f6bcfbdSStefan Behrens 4180d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 41813f6bcfbdSStefan Behrens ret = -EFAULT; 4182adfa97cbSIlya Dryomov out: 41833f6bcfbdSStefan Behrens kfree(p); 41843f6bcfbdSStefan Behrens return ret; 41853f6bcfbdSStefan Behrens } 41863f6bcfbdSStefan Behrens 4187d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 4188d7728c96SJan Schmidt { 4189d7728c96SJan Schmidt int ret = 0; 4190d7728c96SJan Schmidt int i; 4191740c3d22SChris Mason u64 rel_ptr; 4192d7728c96SJan Schmidt int size; 4193806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 4194d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 4195d7728c96SJan Schmidt struct btrfs_path *path; 4196d7728c96SJan Schmidt 419782b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 4198d7728c96SJan Schmidt return -EPERM; 4199d7728c96SJan Schmidt 4200d7728c96SJan Schmidt path = btrfs_alloc_path(); 4201d7728c96SJan Schmidt if (!path) { 4202d7728c96SJan Schmidt ret = -ENOMEM; 4203d7728c96SJan Schmidt goto out; 4204d7728c96SJan Schmidt } 4205d7728c96SJan Schmidt 4206d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 4207d7728c96SJan Schmidt if (IS_ERR(ipa)) { 4208d7728c96SJan Schmidt ret = PTR_ERR(ipa); 4209d7728c96SJan Schmidt ipa = NULL; 4210d7728c96SJan Schmidt goto out; 4211d7728c96SJan Schmidt } 4212d7728c96SJan Schmidt 4213d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 4214d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 4215d7728c96SJan Schmidt if (IS_ERR(ipath)) { 4216d7728c96SJan Schmidt ret = PTR_ERR(ipath); 4217d7728c96SJan Schmidt ipath = NULL; 4218d7728c96SJan Schmidt goto out; 4219d7728c96SJan Schmidt } 4220d7728c96SJan Schmidt 4221d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 4222d7728c96SJan Schmidt if (ret < 0) 4223d7728c96SJan Schmidt goto out; 4224d7728c96SJan Schmidt 4225d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 4226745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 4227745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 4228740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 4229d7728c96SJan Schmidt } 4230d7728c96SJan Schmidt 4231718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 4232718dc5faSOmar Sandoval ipath->fspath, size); 4233d7728c96SJan Schmidt if (ret) { 4234d7728c96SJan Schmidt ret = -EFAULT; 4235d7728c96SJan Schmidt goto out; 4236d7728c96SJan Schmidt } 4237d7728c96SJan Schmidt 4238d7728c96SJan Schmidt out: 4239d7728c96SJan Schmidt btrfs_free_path(path); 4240d7728c96SJan Schmidt free_ipath(ipath); 4241d7728c96SJan Schmidt kfree(ipa); 4242d7728c96SJan Schmidt 4243d7728c96SJan Schmidt return ret; 4244d7728c96SJan Schmidt } 4245d7728c96SJan Schmidt 4246d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 4247d7728c96SJan Schmidt { 4248d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 4249d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 4250d7728c96SJan Schmidt 4251d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 4252d7728c96SJan Schmidt inodes->bytes_left -= c; 4253d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 4254d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 4255d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 4256d7728c96SJan Schmidt inodes->elem_cnt += 3; 4257d7728c96SJan Schmidt } else { 4258d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 4259d7728c96SJan Schmidt inodes->bytes_left = 0; 4260d7728c96SJan Schmidt inodes->elem_missed += 3; 4261d7728c96SJan Schmidt } 4262d7728c96SJan Schmidt 4263d7728c96SJan Schmidt return 0; 4264d7728c96SJan Schmidt } 4265d7728c96SJan Schmidt 42662ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 4267d24a67b2SZygo Blaxell void __user *arg, int version) 4268d7728c96SJan Schmidt { 4269d7728c96SJan Schmidt int ret = 0; 4270d7728c96SJan Schmidt int size; 4271d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 4272d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 4273d7728c96SJan Schmidt struct btrfs_path *path = NULL; 4274d24a67b2SZygo Blaxell bool ignore_offset; 4275d7728c96SJan Schmidt 4276d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4277d7728c96SJan Schmidt return -EPERM; 4278d7728c96SJan Schmidt 4279d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 42807b9ea627SShailendra Verma if (IS_ERR(loi)) 42817b9ea627SShailendra Verma return PTR_ERR(loi); 4282d7728c96SJan Schmidt 4283d24a67b2SZygo Blaxell if (version == 1) { 4284d24a67b2SZygo Blaxell ignore_offset = false; 4285b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 4286d24a67b2SZygo Blaxell } else { 4287d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 4288d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 4289d24a67b2SZygo Blaxell ret = -EINVAL; 4290d24a67b2SZygo Blaxell goto out_loi; 4291d24a67b2SZygo Blaxell } 4292d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 4293d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 4294d24a67b2SZygo Blaxell ret = -EINVAL; 4295d24a67b2SZygo Blaxell goto out_loi; 4296d24a67b2SZygo Blaxell } 4297d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 4298b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 4299d24a67b2SZygo Blaxell } 4300d24a67b2SZygo Blaxell 4301d7728c96SJan Schmidt path = btrfs_alloc_path(); 4302d7728c96SJan Schmidt if (!path) { 4303d7728c96SJan Schmidt ret = -ENOMEM; 4304d7728c96SJan Schmidt goto out; 4305d7728c96SJan Schmidt } 4306d7728c96SJan Schmidt 4307d7728c96SJan Schmidt inodes = init_data_container(size); 4308d7728c96SJan Schmidt if (IS_ERR(inodes)) { 4309d7728c96SJan Schmidt ret = PTR_ERR(inodes); 4310d7728c96SJan Schmidt inodes = NULL; 4311d7728c96SJan Schmidt goto out; 4312d7728c96SJan Schmidt } 4313d7728c96SJan Schmidt 43142ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 4315d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 4316df031f07SLiu Bo if (ret == -EINVAL) 4317d7728c96SJan Schmidt ret = -ENOENT; 4318d7728c96SJan Schmidt if (ret < 0) 4319d7728c96SJan Schmidt goto out; 4320d7728c96SJan Schmidt 4321718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 4322718dc5faSOmar Sandoval size); 4323d7728c96SJan Schmidt if (ret) 4324d7728c96SJan Schmidt ret = -EFAULT; 4325d7728c96SJan Schmidt 4326d7728c96SJan Schmidt out: 4327d7728c96SJan Schmidt btrfs_free_path(path); 4328f54de068SDavid Sterba kvfree(inodes); 4329d24a67b2SZygo Blaxell out_loi: 4330d7728c96SJan Schmidt kfree(loi); 4331d7728c96SJan Schmidt 4332d7728c96SJan Schmidt return ret; 4333d7728c96SJan Schmidt } 4334d7728c96SJan Schmidt 4335008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 4336c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 4337c9e9f97bSIlya Dryomov { 4338c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 4339c9e9f97bSIlya Dryomov 4340c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 4341c9e9f97bSIlya Dryomov 43423009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 4343837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 4344837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 4345837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 4346a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 4347a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 4348837d5b6eSIlya Dryomov 4349c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 4350c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 4351c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 435219a39dceSIlya Dryomov 435319a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 435419a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 435519a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 4356c9e9f97bSIlya Dryomov } 4357c9e9f97bSIlya Dryomov 4358*7fb10ed8SNikolay Borisov /** 4359*7fb10ed8SNikolay Borisov * Try to acquire fs_info::balance_mutex as well as set BTRFS_EXLCOP_BALANCE as 4360*7fb10ed8SNikolay Borisov * required. 4361*7fb10ed8SNikolay Borisov * 4362*7fb10ed8SNikolay Borisov * @fs_info: the filesystem 4363*7fb10ed8SNikolay Borisov * @excl_acquired: ptr to boolean value which is set to false in case balance 4364*7fb10ed8SNikolay Borisov * is being resumed 4365*7fb10ed8SNikolay Borisov * 4366*7fb10ed8SNikolay Borisov * Return 0 on success in which case both fs_info::balance is acquired as well 4367*7fb10ed8SNikolay Borisov * as exclusive ops are blocked. In case of failure return an error code. 4368*7fb10ed8SNikolay Borisov */ 4369*7fb10ed8SNikolay Borisov static int btrfs_try_lock_balance(struct btrfs_fs_info *fs_info, bool *excl_acquired) 4370*7fb10ed8SNikolay Borisov { 4371*7fb10ed8SNikolay Borisov int ret; 4372*7fb10ed8SNikolay Borisov 4373*7fb10ed8SNikolay Borisov /* 4374*7fb10ed8SNikolay Borisov * Exclusive operation is locked. Three possibilities: 4375*7fb10ed8SNikolay Borisov * (1) some other op is running 4376*7fb10ed8SNikolay Borisov * (2) balance is running 4377*7fb10ed8SNikolay Borisov * (3) balance is paused -- special case (think resume) 4378*7fb10ed8SNikolay Borisov */ 4379*7fb10ed8SNikolay Borisov while (1) { 4380*7fb10ed8SNikolay Borisov if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 4381*7fb10ed8SNikolay Borisov *excl_acquired = true; 4382*7fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 4383*7fb10ed8SNikolay Borisov return 0; 4384*7fb10ed8SNikolay Borisov } 4385*7fb10ed8SNikolay Borisov 4386*7fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 4387*7fb10ed8SNikolay Borisov if (fs_info->balance_ctl) { 4388*7fb10ed8SNikolay Borisov /* This is either (2) or (3) */ 4389*7fb10ed8SNikolay Borisov if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4390*7fb10ed8SNikolay Borisov /* This is (2) */ 4391*7fb10ed8SNikolay Borisov ret = -EINPROGRESS; 4392*7fb10ed8SNikolay Borisov goto out_failure; 4393*7fb10ed8SNikolay Borisov 4394*7fb10ed8SNikolay Borisov } else { 4395*7fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 4396*7fb10ed8SNikolay Borisov /* 4397*7fb10ed8SNikolay Borisov * Lock released to allow other waiters to 4398*7fb10ed8SNikolay Borisov * continue, we'll reexamine the status again. 4399*7fb10ed8SNikolay Borisov */ 4400*7fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 4401*7fb10ed8SNikolay Borisov 4402*7fb10ed8SNikolay Borisov if (fs_info->balance_ctl && 4403*7fb10ed8SNikolay Borisov !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4404*7fb10ed8SNikolay Borisov /* This is (3) */ 4405*7fb10ed8SNikolay Borisov *excl_acquired = false; 4406*7fb10ed8SNikolay Borisov return 0; 4407*7fb10ed8SNikolay Borisov } 4408*7fb10ed8SNikolay Borisov } 4409*7fb10ed8SNikolay Borisov } else { 4410*7fb10ed8SNikolay Borisov /* This is (1) */ 4411*7fb10ed8SNikolay Borisov ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4412*7fb10ed8SNikolay Borisov goto out_failure; 4413*7fb10ed8SNikolay Borisov } 4414*7fb10ed8SNikolay Borisov 4415*7fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 4416*7fb10ed8SNikolay Borisov } 4417*7fb10ed8SNikolay Borisov 4418*7fb10ed8SNikolay Borisov out_failure: 4419*7fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 4420*7fb10ed8SNikolay Borisov *excl_acquired = false; 4421*7fb10ed8SNikolay Borisov return ret; 4422*7fb10ed8SNikolay Borisov } 4423*7fb10ed8SNikolay Borisov 44249ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4425c9e9f97bSIlya Dryomov { 4426496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4427c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4428c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4429c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4430ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4431c9e9f97bSIlya Dryomov int ret; 4432c9e9f97bSIlya Dryomov 4433c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4434c9e9f97bSIlya Dryomov return -EPERM; 4435c9e9f97bSIlya Dryomov 4436e54bfa31SLiu Bo ret = mnt_want_write_file(file); 44379ba1f6e4SLiu Bo if (ret) 44389ba1f6e4SLiu Bo return ret; 44399ba1f6e4SLiu Bo 4440d8645462SNikolay Borisov bargs = memdup_user(arg, sizeof(*bargs)); 4441d8645462SNikolay Borisov if (IS_ERR(bargs)) { 4442d8645462SNikolay Borisov ret = PTR_ERR(bargs); 4443d8645462SNikolay Borisov bargs = NULL; 4444d8645462SNikolay Borisov goto out; 4445d8645462SNikolay Borisov } 4446d8645462SNikolay Borisov 4447ed0fb78fSIlya Dryomov again: 4448c3e1f96cSGoldwyn Rodrigues if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 4449c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4450ed0fb78fSIlya Dryomov need_unlock = true; 4451ed0fb78fSIlya Dryomov goto locked; 4452ed0fb78fSIlya Dryomov } 4453ed0fb78fSIlya Dryomov 4454ed0fb78fSIlya Dryomov /* 445501327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 4456ed0fb78fSIlya Dryomov * (1) some other op is running 4457ed0fb78fSIlya Dryomov * (2) balance is running 4458ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4459ed0fb78fSIlya Dryomov */ 4460ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4461ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4462ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 44633009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4464ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4465dccdb07bSDavid Sterba /* 4466dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 4467dccdb07bSDavid Sterba * we'll reexamine the status again. 4468dccdb07bSDavid Sterba */ 4469ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4470ed0fb78fSIlya Dryomov 4471ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 44723009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4473ed0fb78fSIlya Dryomov /* this is (3) */ 4474ed0fb78fSIlya Dryomov need_unlock = false; 4475ed0fb78fSIlya Dryomov goto locked; 4476ed0fb78fSIlya Dryomov } 4477ed0fb78fSIlya Dryomov 4478ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4479ed0fb78fSIlya Dryomov goto again; 4480ed0fb78fSIlya Dryomov } else { 4481ed0fb78fSIlya Dryomov /* this is (2) */ 4482ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4483ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4484ed0fb78fSIlya Dryomov goto out; 4485ed0fb78fSIlya Dryomov } 4486ed0fb78fSIlya Dryomov } else { 4487ed0fb78fSIlya Dryomov /* this is (1) */ 4488ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4489e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4490ed0fb78fSIlya Dryomov goto out; 4491ed0fb78fSIlya Dryomov } 4492ed0fb78fSIlya Dryomov 4493ed0fb78fSIlya Dryomov locked: 4494de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4495de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4496de322263SIlya Dryomov ret = -ENOTCONN; 4497d8645462SNikolay Borisov goto out_unlock; 4498de322263SIlya Dryomov } 4499de322263SIlya Dryomov 4500de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4501de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4502de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4503de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4504efc0e69cSNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE); 4505de322263SIlya Dryomov 4506de322263SIlya Dryomov goto do_balance; 4507de322263SIlya Dryomov } 4508c9e9f97bSIlya Dryomov 4509d8645462SNikolay Borisov if (bargs->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 4510d8645462SNikolay Borisov ret = -EINVAL; 4511d8645462SNikolay Borisov goto out_unlock; 4512c9e9f97bSIlya Dryomov } 4513c9e9f97bSIlya Dryomov 4514ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4515837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4516d8645462SNikolay Borisov goto out_unlock; 4517837d5b6eSIlya Dryomov } 4518837d5b6eSIlya Dryomov 45198d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4520c9e9f97bSIlya Dryomov if (!bctl) { 4521c9e9f97bSIlya Dryomov ret = -ENOMEM; 4522d8645462SNikolay Borisov goto out_unlock; 4523c9e9f97bSIlya Dryomov } 4524c9e9f97bSIlya Dryomov 4525c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4526c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4527c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4528c9e9f97bSIlya Dryomov 4529c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4530de322263SIlya Dryomov do_balance: 4531c9e9f97bSIlya Dryomov /* 4532c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 4533c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 4534c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 4535c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 4536c9e9f97bSIlya Dryomov */ 4537ed0fb78fSIlya Dryomov need_unlock = false; 4538ed0fb78fSIlya Dryomov 45396fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 45400f89abf5SChristian Engelmayer bctl = NULL; 4541ed0fb78fSIlya Dryomov 454239864601SNikolay Borisov if (ret == 0 || ret == -ECANCELED) { 4543c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4544c9e9f97bSIlya Dryomov ret = -EFAULT; 4545c9e9f97bSIlya Dryomov } 4546c9e9f97bSIlya Dryomov 45470f89abf5SChristian Engelmayer kfree(bctl); 4548ed0fb78fSIlya Dryomov out_unlock: 4549c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4550ed0fb78fSIlya Dryomov if (need_unlock) 4551c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 4552ed0fb78fSIlya Dryomov out: 4553e54bfa31SLiu Bo mnt_drop_write_file(file); 4554d8645462SNikolay Borisov kfree(bargs); 4555c9e9f97bSIlya Dryomov return ret; 4556c9e9f97bSIlya Dryomov } 4557c9e9f97bSIlya Dryomov 45582ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4559837d5b6eSIlya Dryomov { 4560837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4561837d5b6eSIlya Dryomov return -EPERM; 4562837d5b6eSIlya Dryomov 4563837d5b6eSIlya Dryomov switch (cmd) { 4564837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 45650b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4566a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 45670b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4568837d5b6eSIlya Dryomov } 4569837d5b6eSIlya Dryomov 4570837d5b6eSIlya Dryomov return -EINVAL; 4571837d5b6eSIlya Dryomov } 4572837d5b6eSIlya Dryomov 45732ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 457419a39dceSIlya Dryomov void __user *arg) 457519a39dceSIlya Dryomov { 457619a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 457719a39dceSIlya Dryomov int ret = 0; 457819a39dceSIlya Dryomov 457919a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 458019a39dceSIlya Dryomov return -EPERM; 458119a39dceSIlya Dryomov 458219a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 458319a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 458419a39dceSIlya Dryomov ret = -ENOTCONN; 458519a39dceSIlya Dryomov goto out; 458619a39dceSIlya Dryomov } 458719a39dceSIlya Dryomov 45888d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 458919a39dceSIlya Dryomov if (!bargs) { 459019a39dceSIlya Dryomov ret = -ENOMEM; 459119a39dceSIlya Dryomov goto out; 459219a39dceSIlya Dryomov } 459319a39dceSIlya Dryomov 4594008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 459519a39dceSIlya Dryomov 459619a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 459719a39dceSIlya Dryomov ret = -EFAULT; 459819a39dceSIlya Dryomov 459919a39dceSIlya Dryomov kfree(bargs); 460019a39dceSIlya Dryomov out: 460119a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 460219a39dceSIlya Dryomov return ret; 460319a39dceSIlya Dryomov } 460419a39dceSIlya Dryomov 4605905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 46065d13a37bSArne Jansen { 46070b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46080b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 46095d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 46105d13a37bSArne Jansen int ret; 46115d13a37bSArne Jansen 46125d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 46135d13a37bSArne Jansen return -EPERM; 46145d13a37bSArne Jansen 4615905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4616905b0ddaSMiao Xie if (ret) 4617905b0ddaSMiao Xie return ret; 46185d13a37bSArne Jansen 46195d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4620905b0ddaSMiao Xie if (IS_ERR(sa)) { 4621905b0ddaSMiao Xie ret = PTR_ERR(sa); 4622905b0ddaSMiao Xie goto drop_write; 4623905b0ddaSMiao Xie } 46245d13a37bSArne Jansen 46250b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 46265d13a37bSArne Jansen 46275d13a37bSArne Jansen switch (sa->cmd) { 46285d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4629340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 46305d13a37bSArne Jansen break; 46315d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4632340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 46335d13a37bSArne Jansen break; 46345d13a37bSArne Jansen default: 46355d13a37bSArne Jansen ret = -EINVAL; 46365d13a37bSArne Jansen break; 46375d13a37bSArne Jansen } 46385d13a37bSArne Jansen 46395d13a37bSArne Jansen kfree(sa); 46400b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4641905b0ddaSMiao Xie drop_write: 4642905b0ddaSMiao Xie mnt_drop_write_file(file); 46435d13a37bSArne Jansen return ret; 46445d13a37bSArne Jansen } 46455d13a37bSArne Jansen 4646905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 46475d13a37bSArne Jansen { 46480b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46490b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 46500b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46515d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 46525d13a37bSArne Jansen struct btrfs_trans_handle *trans; 46535d13a37bSArne Jansen int ret; 46545d13a37bSArne Jansen int err; 46555d13a37bSArne Jansen 46565d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 46575d13a37bSArne Jansen return -EPERM; 46585d13a37bSArne Jansen 4659905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4660905b0ddaSMiao Xie if (ret) 4661905b0ddaSMiao Xie return ret; 46625d13a37bSArne Jansen 46635d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4664905b0ddaSMiao Xie if (IS_ERR(sa)) { 4665905b0ddaSMiao Xie ret = PTR_ERR(sa); 4666905b0ddaSMiao Xie goto drop_write; 4667905b0ddaSMiao Xie } 46685d13a37bSArne Jansen 46695d13a37bSArne Jansen trans = btrfs_join_transaction(root); 46705d13a37bSArne Jansen if (IS_ERR(trans)) { 46715d13a37bSArne Jansen ret = PTR_ERR(trans); 46725d13a37bSArne Jansen goto out; 46735d13a37bSArne Jansen } 46745d13a37bSArne Jansen 46755d13a37bSArne Jansen if (sa->assign) { 46769f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 46775d13a37bSArne Jansen } else { 467839616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 46795d13a37bSArne Jansen } 46805d13a37bSArne Jansen 4681e082f563SQu Wenruo /* update qgroup status and info */ 4682280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4683e082f563SQu Wenruo if (err < 0) 46840b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4685ad8403dfSAnand Jain "failed to update qgroup status and info"); 46863a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 46875d13a37bSArne Jansen if (err && !ret) 46885d13a37bSArne Jansen ret = err; 46895d13a37bSArne Jansen 46905d13a37bSArne Jansen out: 46915d13a37bSArne Jansen kfree(sa); 4692905b0ddaSMiao Xie drop_write: 4693905b0ddaSMiao Xie mnt_drop_write_file(file); 46945d13a37bSArne Jansen return ret; 46955d13a37bSArne Jansen } 46965d13a37bSArne Jansen 4697905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 46985d13a37bSArne Jansen { 46990b246afaSJeff Mahoney struct inode *inode = file_inode(file); 47000b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 47015d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 47025d13a37bSArne Jansen struct btrfs_trans_handle *trans; 47035d13a37bSArne Jansen int ret; 47045d13a37bSArne Jansen int err; 47055d13a37bSArne Jansen 47065d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 47075d13a37bSArne Jansen return -EPERM; 47085d13a37bSArne Jansen 4709905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4710905b0ddaSMiao Xie if (ret) 4711905b0ddaSMiao Xie return ret; 47125d13a37bSArne Jansen 47135d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4714905b0ddaSMiao Xie if (IS_ERR(sa)) { 4715905b0ddaSMiao Xie ret = PTR_ERR(sa); 4716905b0ddaSMiao Xie goto drop_write; 4717905b0ddaSMiao Xie } 47185d13a37bSArne Jansen 4719d86e56cfSMiao Xie if (!sa->qgroupid) { 4720d86e56cfSMiao Xie ret = -EINVAL; 4721d86e56cfSMiao Xie goto out; 4722d86e56cfSMiao Xie } 4723d86e56cfSMiao Xie 47245d13a37bSArne Jansen trans = btrfs_join_transaction(root); 47255d13a37bSArne Jansen if (IS_ERR(trans)) { 47265d13a37bSArne Jansen ret = PTR_ERR(trans); 47275d13a37bSArne Jansen goto out; 47285d13a37bSArne Jansen } 47295d13a37bSArne Jansen 47305d13a37bSArne Jansen if (sa->create) { 473149a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 47325d13a37bSArne Jansen } else { 47333efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 47345d13a37bSArne Jansen } 47355d13a37bSArne Jansen 47363a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 47375d13a37bSArne Jansen if (err && !ret) 47385d13a37bSArne Jansen ret = err; 47395d13a37bSArne Jansen 47405d13a37bSArne Jansen out: 47415d13a37bSArne Jansen kfree(sa); 4742905b0ddaSMiao Xie drop_write: 4743905b0ddaSMiao Xie mnt_drop_write_file(file); 47445d13a37bSArne Jansen return ret; 47455d13a37bSArne Jansen } 47465d13a37bSArne Jansen 4747905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 47485d13a37bSArne Jansen { 47490b246afaSJeff Mahoney struct inode *inode = file_inode(file); 47500b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 47515d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 47525d13a37bSArne Jansen struct btrfs_trans_handle *trans; 47535d13a37bSArne Jansen int ret; 47545d13a37bSArne Jansen int err; 47555d13a37bSArne Jansen u64 qgroupid; 47565d13a37bSArne Jansen 47575d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 47585d13a37bSArne Jansen return -EPERM; 47595d13a37bSArne Jansen 4760905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4761905b0ddaSMiao Xie if (ret) 4762905b0ddaSMiao Xie return ret; 47635d13a37bSArne Jansen 47645d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4765905b0ddaSMiao Xie if (IS_ERR(sa)) { 4766905b0ddaSMiao Xie ret = PTR_ERR(sa); 4767905b0ddaSMiao Xie goto drop_write; 4768905b0ddaSMiao Xie } 47695d13a37bSArne Jansen 47705d13a37bSArne Jansen trans = btrfs_join_transaction(root); 47715d13a37bSArne Jansen if (IS_ERR(trans)) { 47725d13a37bSArne Jansen ret = PTR_ERR(trans); 47735d13a37bSArne Jansen goto out; 47745d13a37bSArne Jansen } 47755d13a37bSArne Jansen 47765d13a37bSArne Jansen qgroupid = sa->qgroupid; 47775d13a37bSArne Jansen if (!qgroupid) { 47785d13a37bSArne Jansen /* take the current subvol as qgroup */ 47795d13a37bSArne Jansen qgroupid = root->root_key.objectid; 47805d13a37bSArne Jansen } 47815d13a37bSArne Jansen 4782f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 47835d13a37bSArne Jansen 47843a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 47855d13a37bSArne Jansen if (err && !ret) 47865d13a37bSArne Jansen ret = err; 47875d13a37bSArne Jansen 47885d13a37bSArne Jansen out: 47895d13a37bSArne Jansen kfree(sa); 4790905b0ddaSMiao Xie drop_write: 4791905b0ddaSMiao Xie mnt_drop_write_file(file); 47925d13a37bSArne Jansen return ret; 47935d13a37bSArne Jansen } 47945d13a37bSArne Jansen 47952f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 47962f232036SJan Schmidt { 47970b246afaSJeff Mahoney struct inode *inode = file_inode(file); 47980b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 47992f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 48002f232036SJan Schmidt int ret; 48012f232036SJan Schmidt 48022f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 48032f232036SJan Schmidt return -EPERM; 48042f232036SJan Schmidt 48052f232036SJan Schmidt ret = mnt_want_write_file(file); 48062f232036SJan Schmidt if (ret) 48072f232036SJan Schmidt return ret; 48082f232036SJan Schmidt 48092f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 48102f232036SJan Schmidt if (IS_ERR(qsa)) { 48112f232036SJan Schmidt ret = PTR_ERR(qsa); 48122f232036SJan Schmidt goto drop_write; 48132f232036SJan Schmidt } 48142f232036SJan Schmidt 48152f232036SJan Schmidt if (qsa->flags) { 48162f232036SJan Schmidt ret = -EINVAL; 48172f232036SJan Schmidt goto out; 48182f232036SJan Schmidt } 48192f232036SJan Schmidt 48200b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 48212f232036SJan Schmidt 48222f232036SJan Schmidt out: 48232f232036SJan Schmidt kfree(qsa); 48242f232036SJan Schmidt drop_write: 48252f232036SJan Schmidt mnt_drop_write_file(file); 48262f232036SJan Schmidt return ret; 48272f232036SJan Schmidt } 48282f232036SJan Schmidt 4829b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4830b929c1d8SMarcos Paulo de Souza void __user *arg) 48312f232036SJan Schmidt { 48320afb603aSGoldwyn Rodrigues struct btrfs_ioctl_quota_rescan_args qsa = {0}; 48332f232036SJan Schmidt 48342f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 48352f232036SJan Schmidt return -EPERM; 48362f232036SJan Schmidt 48370b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 48380afb603aSGoldwyn Rodrigues qsa.flags = 1; 48390afb603aSGoldwyn Rodrigues qsa.progress = fs_info->qgroup_rescan_progress.objectid; 48402f232036SJan Schmidt } 48412f232036SJan Schmidt 48420afb603aSGoldwyn Rodrigues if (copy_to_user(arg, &qsa, sizeof(qsa))) 4843991a3daeSAnand Jain return -EFAULT; 48442f232036SJan Schmidt 4845991a3daeSAnand Jain return 0; 48462f232036SJan Schmidt } 48472f232036SJan Schmidt 4848b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4849b929c1d8SMarcos Paulo de Souza void __user *arg) 485057254b6eSJan Schmidt { 485157254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 485257254b6eSJan Schmidt return -EPERM; 485357254b6eSJan Schmidt 48540b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 485557254b6eSJan Schmidt } 485657254b6eSJan Schmidt 4857abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4858e4fed17aSChristian Brauner struct user_namespace *mnt_userns, 4859abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 48608ea05e3aSAlexander Block { 4861496ad9aaSAl Viro struct inode *inode = file_inode(file); 48620b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 48638ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 48648ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 48658ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 486695582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 48678ea05e3aSAlexander Block int ret = 0; 4868dd5f9615SStefan Behrens int received_uuid_changed; 48698ea05e3aSAlexander Block 4870e4fed17aSChristian Brauner if (!inode_owner_or_capable(mnt_userns, inode)) 4871bd60ea0fSDavid Sterba return -EPERM; 4872bd60ea0fSDavid Sterba 48738ea05e3aSAlexander Block ret = mnt_want_write_file(file); 48748ea05e3aSAlexander Block if (ret < 0) 48758ea05e3aSAlexander Block return ret; 48768ea05e3aSAlexander Block 48770b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 48788ea05e3aSAlexander Block 48794a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 48808ea05e3aSAlexander Block ret = -EINVAL; 48818ea05e3aSAlexander Block goto out; 48828ea05e3aSAlexander Block } 48838ea05e3aSAlexander Block 48848ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 48858ea05e3aSAlexander Block ret = -EROFS; 48868ea05e3aSAlexander Block goto out; 48878ea05e3aSAlexander Block } 48888ea05e3aSAlexander Block 4889dd5f9615SStefan Behrens /* 4890dd5f9615SStefan Behrens * 1 - root item 4891dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4892dd5f9615SStefan Behrens */ 4893dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 48948ea05e3aSAlexander Block if (IS_ERR(trans)) { 48958ea05e3aSAlexander Block ret = PTR_ERR(trans); 48968ea05e3aSAlexander Block trans = NULL; 48978ea05e3aSAlexander Block goto out; 48988ea05e3aSAlexander Block } 48998ea05e3aSAlexander Block 49008ea05e3aSAlexander Block sa->rtransid = trans->transid; 49018ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 49028ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 49038ea05e3aSAlexander Block 4904dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4905dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4906dd5f9615SStefan Behrens if (received_uuid_changed && 4907d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4908d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4909dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4910dd5f9615SStefan Behrens root->root_key.objectid); 4911d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4912d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4913d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4914d87ff758SNikolay Borisov goto out; 4915d87ff758SNikolay Borisov } 4916d87ff758SNikolay Borisov } 49178ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 49188ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 49198ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 49203cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 49213cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 49223cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 49233cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 49248ea05e3aSAlexander Block 49250b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 49268ea05e3aSAlexander Block &root->root_key, &root->root_item); 49278ea05e3aSAlexander Block if (ret < 0) { 49283a45bb20SJeff Mahoney btrfs_end_transaction(trans); 49298ea05e3aSAlexander Block goto out; 4930dd5f9615SStefan Behrens } 4931dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4932cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4933dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4934dd5f9615SStefan Behrens root->root_key.objectid); 4935dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 493666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4937efd38150SNikolay Borisov btrfs_end_transaction(trans); 4938dd5f9615SStefan Behrens goto out; 4939dd5f9615SStefan Behrens } 4940dd5f9615SStefan Behrens } 49413a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4942abccd00fSHugo Mills out: 49430b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4944abccd00fSHugo Mills mnt_drop_write_file(file); 4945abccd00fSHugo Mills return ret; 4946abccd00fSHugo Mills } 4947abccd00fSHugo Mills 4948abccd00fSHugo Mills #ifdef CONFIG_64BIT 4949abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4950abccd00fSHugo Mills void __user *arg) 4951abccd00fSHugo Mills { 4952abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4953abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4954abccd00fSHugo Mills int ret = 0; 4955abccd00fSHugo Mills 4956abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 49577b9ea627SShailendra Verma if (IS_ERR(args32)) 49587b9ea627SShailendra Verma return PTR_ERR(args32); 4959abccd00fSHugo Mills 49608d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 496184dbeb87SDan Carpenter if (!args64) { 496284dbeb87SDan Carpenter ret = -ENOMEM; 4963abccd00fSHugo Mills goto out; 4964abccd00fSHugo Mills } 4965abccd00fSHugo Mills 4966abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4967abccd00fSHugo Mills args64->stransid = args32->stransid; 4968abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4969abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4970abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4971abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4972abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4973abccd00fSHugo Mills args64->flags = args32->flags; 4974abccd00fSHugo Mills 4975e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), args64); 4976abccd00fSHugo Mills if (ret) 4977abccd00fSHugo Mills goto out; 4978abccd00fSHugo Mills 4979abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4980abccd00fSHugo Mills args32->stransid = args64->stransid; 4981abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4982abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4983abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4984abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4985abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4986abccd00fSHugo Mills args32->flags = args64->flags; 4987abccd00fSHugo Mills 4988abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4989abccd00fSHugo Mills if (ret) 4990abccd00fSHugo Mills ret = -EFAULT; 4991abccd00fSHugo Mills 4992abccd00fSHugo Mills out: 4993abccd00fSHugo Mills kfree(args32); 4994abccd00fSHugo Mills kfree(args64); 4995abccd00fSHugo Mills return ret; 4996abccd00fSHugo Mills } 4997abccd00fSHugo Mills #endif 4998abccd00fSHugo Mills 4999abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 5000abccd00fSHugo Mills void __user *arg) 5001abccd00fSHugo Mills { 5002abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 5003abccd00fSHugo Mills int ret = 0; 5004abccd00fSHugo Mills 5005abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 50067b9ea627SShailendra Verma if (IS_ERR(sa)) 50077b9ea627SShailendra Verma return PTR_ERR(sa); 5008abccd00fSHugo Mills 5009e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), sa); 5010abccd00fSHugo Mills 5011abccd00fSHugo Mills if (ret) 5012abccd00fSHugo Mills goto out; 5013abccd00fSHugo Mills 50148ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 50158ea05e3aSAlexander Block if (ret) 50168ea05e3aSAlexander Block ret = -EFAULT; 50178ea05e3aSAlexander Block 50188ea05e3aSAlexander Block out: 50198ea05e3aSAlexander Block kfree(sa); 50208ea05e3aSAlexander Block return ret; 50218ea05e3aSAlexander Block } 50228ea05e3aSAlexander Block 5023b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 5024b929c1d8SMarcos Paulo de Souza void __user *arg) 5025867ab667Sjeff.liu { 5026a1b83ac5SAnand Jain size_t len; 5027867ab667Sjeff.liu int ret; 5028a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 5029a1b83ac5SAnand Jain 50300b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 50310b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 50320b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 5033a1b83ac5SAnand Jain 5034a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 5035867ab667Sjeff.liu 5036867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 50370b246afaSJeff Mahoney btrfs_warn(fs_info, 50380b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 50390b246afaSJeff Mahoney --len); 5040867ab667Sjeff.liu } 5041867ab667Sjeff.liu 5042867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 5043867ab667Sjeff.liu 5044867ab667Sjeff.liu return ret ? -EFAULT : 0; 5045867ab667Sjeff.liu } 5046867ab667Sjeff.liu 5047a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 5048a8bfd4abSjeff.liu { 50490b246afaSJeff Mahoney struct inode *inode = file_inode(file); 50500b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 50510b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 50520b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 5053a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 5054a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 5055a8bfd4abSjeff.liu int ret; 5056a8bfd4abSjeff.liu 5057a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 5058a8bfd4abSjeff.liu return -EPERM; 5059a8bfd4abSjeff.liu 5060a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 5061a8bfd4abSjeff.liu return -EFAULT; 5062a8bfd4abSjeff.liu 5063a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 50640b246afaSJeff Mahoney btrfs_err(fs_info, 50655d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 5066a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 5067a8bfd4abSjeff.liu return -EINVAL; 5068a8bfd4abSjeff.liu } 5069a8bfd4abSjeff.liu 5070a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 5071a8bfd4abSjeff.liu if (ret) 5072a8bfd4abSjeff.liu return ret; 5073a8bfd4abSjeff.liu 5074a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 5075a8bfd4abSjeff.liu if (IS_ERR(trans)) { 5076a8bfd4abSjeff.liu ret = PTR_ERR(trans); 5077a8bfd4abSjeff.liu goto out_unlock; 5078a8bfd4abSjeff.liu } 5079a8bfd4abSjeff.liu 50800b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 5081a8bfd4abSjeff.liu strcpy(super_block->label, label); 50820b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 50833a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 5084a8bfd4abSjeff.liu 5085a8bfd4abSjeff.liu out_unlock: 5086a8bfd4abSjeff.liu mnt_drop_write_file(file); 5087a8bfd4abSjeff.liu return ret; 5088a8bfd4abSjeff.liu } 5089a8bfd4abSjeff.liu 50902eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 50912eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 50922eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 50932eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 50942eaa055fSJeff Mahoney 5095d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 50962eaa055fSJeff Mahoney { 50974d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 50982eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 50992eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 51002eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 51012eaa055fSJeff Mahoney }; 51022eaa055fSJeff Mahoney 51032eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 51042eaa055fSJeff Mahoney return -EFAULT; 51052eaa055fSJeff Mahoney 51062eaa055fSJeff Mahoney return 0; 51072eaa055fSJeff Mahoney } 51082eaa055fSJeff Mahoney 5109b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 5110b929c1d8SMarcos Paulo de Souza void __user *arg) 51112eaa055fSJeff Mahoney { 51120b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 51132eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 51142eaa055fSJeff Mahoney 51152eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 51162eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 51172eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 51182eaa055fSJeff Mahoney 51192eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 51202eaa055fSJeff Mahoney return -EFAULT; 51212eaa055fSJeff Mahoney 51222eaa055fSJeff Mahoney return 0; 51232eaa055fSJeff Mahoney } 51242eaa055fSJeff Mahoney 51252ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 51263b02a68aSJeff Mahoney enum btrfs_feature_set set, 51272eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 51282eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 51292eaa055fSJeff Mahoney { 5130f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 51313b02a68aSJeff Mahoney char *names; 51322eaa055fSJeff Mahoney u64 disallowed, unsupported; 51332eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 51342eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 51352eaa055fSJeff Mahoney 51362eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 51372eaa055fSJeff Mahoney if (unsupported) { 51383b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 51393b02a68aSJeff Mahoney if (names) { 51400b246afaSJeff Mahoney btrfs_warn(fs_info, 51413b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 51423b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 51433b02a68aSJeff Mahoney kfree(names); 51443b02a68aSJeff Mahoney } else 51450b246afaSJeff Mahoney btrfs_warn(fs_info, 51462eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 51472eaa055fSJeff Mahoney type, unsupported); 51482eaa055fSJeff Mahoney return -EOPNOTSUPP; 51492eaa055fSJeff Mahoney } 51502eaa055fSJeff Mahoney 51512eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 51522eaa055fSJeff Mahoney if (disallowed) { 51533b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 51543b02a68aSJeff Mahoney if (names) { 51550b246afaSJeff Mahoney btrfs_warn(fs_info, 51563b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 51573b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 51583b02a68aSJeff Mahoney kfree(names); 51593b02a68aSJeff Mahoney } else 51600b246afaSJeff Mahoney btrfs_warn(fs_info, 51612eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 51622eaa055fSJeff Mahoney type, disallowed); 51632eaa055fSJeff Mahoney return -EPERM; 51642eaa055fSJeff Mahoney } 51652eaa055fSJeff Mahoney 51662eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 51672eaa055fSJeff Mahoney if (disallowed) { 51683b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 51693b02a68aSJeff Mahoney if (names) { 51700b246afaSJeff Mahoney btrfs_warn(fs_info, 51713b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 51723b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 51733b02a68aSJeff Mahoney kfree(names); 51743b02a68aSJeff Mahoney } else 51750b246afaSJeff Mahoney btrfs_warn(fs_info, 51762eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 51772eaa055fSJeff Mahoney type, disallowed); 51782eaa055fSJeff Mahoney return -EPERM; 51792eaa055fSJeff Mahoney } 51802eaa055fSJeff Mahoney 51812eaa055fSJeff Mahoney return 0; 51822eaa055fSJeff Mahoney } 51832eaa055fSJeff Mahoney 51842ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 51852ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 51862eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 51872eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 51882eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 51892eaa055fSJeff Mahoney 51902eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 51912eaa055fSJeff Mahoney { 51920b246afaSJeff Mahoney struct inode *inode = file_inode(file); 51930b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 51940b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 51950b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 51962eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 51972eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 51982eaa055fSJeff Mahoney u64 newflags; 51992eaa055fSJeff Mahoney int ret; 52002eaa055fSJeff Mahoney 52012eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 52022eaa055fSJeff Mahoney return -EPERM; 52032eaa055fSJeff Mahoney 52042eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 52052eaa055fSJeff Mahoney return -EFAULT; 52062eaa055fSJeff Mahoney 52072eaa055fSJeff Mahoney /* Nothing to do */ 52082eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 52092eaa055fSJeff Mahoney !flags[0].incompat_flags) 52102eaa055fSJeff Mahoney return 0; 52112eaa055fSJeff Mahoney 52122ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 52132eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 52142eaa055fSJeff Mahoney if (ret) 52152eaa055fSJeff Mahoney return ret; 52162eaa055fSJeff Mahoney 52172ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 52182eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 52192eaa055fSJeff Mahoney if (ret) 52202eaa055fSJeff Mahoney return ret; 52212eaa055fSJeff Mahoney 52222ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 52232eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 52242eaa055fSJeff Mahoney if (ret) 52252eaa055fSJeff Mahoney return ret; 52262eaa055fSJeff Mahoney 52277ab19625SDavid Sterba ret = mnt_want_write_file(file); 52287ab19625SDavid Sterba if (ret) 52297ab19625SDavid Sterba return ret; 52307ab19625SDavid Sterba 52318051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 52327ab19625SDavid Sterba if (IS_ERR(trans)) { 52337ab19625SDavid Sterba ret = PTR_ERR(trans); 52347ab19625SDavid Sterba goto out_drop_write; 52357ab19625SDavid Sterba } 52362eaa055fSJeff Mahoney 52370b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 52382eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 52392eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 52402eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 52412eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 52422eaa055fSJeff Mahoney 52432eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 52442eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 52452eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 52462eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 52472eaa055fSJeff Mahoney 52482eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 52492eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 52502eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 52512eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 52520b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 52532eaa055fSJeff Mahoney 52543a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 52557ab19625SDavid Sterba out_drop_write: 52567ab19625SDavid Sterba mnt_drop_write_file(file); 52577ab19625SDavid Sterba 52587ab19625SDavid Sterba return ret; 52592eaa055fSJeff Mahoney } 52602eaa055fSJeff Mahoney 52619ad12305SSahil Kang static int _btrfs_ioctl_send(struct inode *inode, void __user *argp, bool compat) 52622351f431SJosef Bacik { 52632351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 52642351f431SJosef Bacik int ret; 52652351f431SJosef Bacik 52662351f431SJosef Bacik if (compat) { 52672351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 52682351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 52692351f431SJosef Bacik 52702351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 52712351f431SJosef Bacik if (ret) 52722351f431SJosef Bacik return -EFAULT; 52732351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 52742351f431SJosef Bacik if (!arg) 52752351f431SJosef Bacik return -ENOMEM; 52762351f431SJosef Bacik arg->send_fd = args32.send_fd; 52772351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 52782351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 52792351f431SJosef Bacik arg->parent_root = args32.parent_root; 52802351f431SJosef Bacik arg->flags = args32.flags; 52812351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 52822351f431SJosef Bacik sizeof(args32.reserved)); 52832351f431SJosef Bacik #else 52842351f431SJosef Bacik return -ENOTTY; 52852351f431SJosef Bacik #endif 52862351f431SJosef Bacik } else { 52872351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 52882351f431SJosef Bacik if (IS_ERR(arg)) 52892351f431SJosef Bacik return PTR_ERR(arg); 52902351f431SJosef Bacik } 52919ad12305SSahil Kang ret = btrfs_ioctl_send(inode, arg); 52922351f431SJosef Bacik kfree(arg); 52932351f431SJosef Bacik return ret; 52942351f431SJosef Bacik } 52952351f431SJosef Bacik 52961881fba8SOmar Sandoval static int btrfs_ioctl_encoded_read(struct file *file, void __user *argp, 52971881fba8SOmar Sandoval bool compat) 52981881fba8SOmar Sandoval { 52991881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args args = { 0 }; 53001881fba8SOmar Sandoval size_t copy_end_kernel = offsetofend(struct btrfs_ioctl_encoded_io_args, 53011881fba8SOmar Sandoval flags); 53021881fba8SOmar Sandoval size_t copy_end; 53031881fba8SOmar Sandoval struct iovec iovstack[UIO_FASTIOV]; 53041881fba8SOmar Sandoval struct iovec *iov = iovstack; 53051881fba8SOmar Sandoval struct iov_iter iter; 53061881fba8SOmar Sandoval loff_t pos; 53071881fba8SOmar Sandoval struct kiocb kiocb; 53081881fba8SOmar Sandoval ssize_t ret; 53091881fba8SOmar Sandoval 53101881fba8SOmar Sandoval if (!capable(CAP_SYS_ADMIN)) { 53111881fba8SOmar Sandoval ret = -EPERM; 53121881fba8SOmar Sandoval goto out_acct; 53131881fba8SOmar Sandoval } 53141881fba8SOmar Sandoval 53151881fba8SOmar Sandoval if (compat) { 53161881fba8SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 53171881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 args32; 53181881fba8SOmar Sandoval 53191881fba8SOmar Sandoval copy_end = offsetofend(struct btrfs_ioctl_encoded_io_args_32, 53201881fba8SOmar Sandoval flags); 53211881fba8SOmar Sandoval if (copy_from_user(&args32, argp, copy_end)) { 53221881fba8SOmar Sandoval ret = -EFAULT; 53231881fba8SOmar Sandoval goto out_acct; 53241881fba8SOmar Sandoval } 53251881fba8SOmar Sandoval args.iov = compat_ptr(args32.iov); 53261881fba8SOmar Sandoval args.iovcnt = args32.iovcnt; 53271881fba8SOmar Sandoval args.offset = args32.offset; 53281881fba8SOmar Sandoval args.flags = args32.flags; 53291881fba8SOmar Sandoval #else 53301881fba8SOmar Sandoval return -ENOTTY; 53311881fba8SOmar Sandoval #endif 53321881fba8SOmar Sandoval } else { 53331881fba8SOmar Sandoval copy_end = copy_end_kernel; 53341881fba8SOmar Sandoval if (copy_from_user(&args, argp, copy_end)) { 53351881fba8SOmar Sandoval ret = -EFAULT; 53361881fba8SOmar Sandoval goto out_acct; 53371881fba8SOmar Sandoval } 53381881fba8SOmar Sandoval } 53391881fba8SOmar Sandoval if (args.flags != 0) { 53401881fba8SOmar Sandoval ret = -EINVAL; 53411881fba8SOmar Sandoval goto out_acct; 53421881fba8SOmar Sandoval } 53431881fba8SOmar Sandoval 53441881fba8SOmar Sandoval ret = import_iovec(READ, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), 53451881fba8SOmar Sandoval &iov, &iter); 53461881fba8SOmar Sandoval if (ret < 0) 53471881fba8SOmar Sandoval goto out_acct; 53481881fba8SOmar Sandoval 53491881fba8SOmar Sandoval if (iov_iter_count(&iter) == 0) { 53501881fba8SOmar Sandoval ret = 0; 53511881fba8SOmar Sandoval goto out_iov; 53521881fba8SOmar Sandoval } 53531881fba8SOmar Sandoval pos = args.offset; 53541881fba8SOmar Sandoval ret = rw_verify_area(READ, file, &pos, args.len); 53551881fba8SOmar Sandoval if (ret < 0) 53561881fba8SOmar Sandoval goto out_iov; 53571881fba8SOmar Sandoval 53581881fba8SOmar Sandoval init_sync_kiocb(&kiocb, file); 53591881fba8SOmar Sandoval kiocb.ki_pos = pos; 53601881fba8SOmar Sandoval 53611881fba8SOmar Sandoval ret = btrfs_encoded_read(&kiocb, &iter, &args); 53621881fba8SOmar Sandoval if (ret >= 0) { 53631881fba8SOmar Sandoval fsnotify_access(file); 53641881fba8SOmar Sandoval if (copy_to_user(argp + copy_end, 53651881fba8SOmar Sandoval (char *)&args + copy_end_kernel, 53661881fba8SOmar Sandoval sizeof(args) - copy_end_kernel)) 53671881fba8SOmar Sandoval ret = -EFAULT; 53681881fba8SOmar Sandoval } 53691881fba8SOmar Sandoval 53701881fba8SOmar Sandoval out_iov: 53711881fba8SOmar Sandoval kfree(iov); 53721881fba8SOmar Sandoval out_acct: 53731881fba8SOmar Sandoval if (ret > 0) 53741881fba8SOmar Sandoval add_rchar(current, ret); 53751881fba8SOmar Sandoval inc_syscr(current); 53761881fba8SOmar Sandoval return ret; 53771881fba8SOmar Sandoval } 53781881fba8SOmar Sandoval 53797c0c7269SOmar Sandoval static int btrfs_ioctl_encoded_write(struct file *file, void __user *argp, bool compat) 53807c0c7269SOmar Sandoval { 53817c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args args; 53827c0c7269SOmar Sandoval struct iovec iovstack[UIO_FASTIOV]; 53837c0c7269SOmar Sandoval struct iovec *iov = iovstack; 53847c0c7269SOmar Sandoval struct iov_iter iter; 53857c0c7269SOmar Sandoval loff_t pos; 53867c0c7269SOmar Sandoval struct kiocb kiocb; 53877c0c7269SOmar Sandoval ssize_t ret; 53887c0c7269SOmar Sandoval 53897c0c7269SOmar Sandoval if (!capable(CAP_SYS_ADMIN)) { 53907c0c7269SOmar Sandoval ret = -EPERM; 53917c0c7269SOmar Sandoval goto out_acct; 53927c0c7269SOmar Sandoval } 53937c0c7269SOmar Sandoval 53947c0c7269SOmar Sandoval if (!(file->f_mode & FMODE_WRITE)) { 53957c0c7269SOmar Sandoval ret = -EBADF; 53967c0c7269SOmar Sandoval goto out_acct; 53977c0c7269SOmar Sandoval } 53987c0c7269SOmar Sandoval 53997c0c7269SOmar Sandoval if (compat) { 54007c0c7269SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 54017c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 args32; 54027c0c7269SOmar Sandoval 54037c0c7269SOmar Sandoval if (copy_from_user(&args32, argp, sizeof(args32))) { 54047c0c7269SOmar Sandoval ret = -EFAULT; 54057c0c7269SOmar Sandoval goto out_acct; 54067c0c7269SOmar Sandoval } 54077c0c7269SOmar Sandoval args.iov = compat_ptr(args32.iov); 54087c0c7269SOmar Sandoval args.iovcnt = args32.iovcnt; 54097c0c7269SOmar Sandoval args.offset = args32.offset; 54107c0c7269SOmar Sandoval args.flags = args32.flags; 54117c0c7269SOmar Sandoval args.len = args32.len; 54127c0c7269SOmar Sandoval args.unencoded_len = args32.unencoded_len; 54137c0c7269SOmar Sandoval args.unencoded_offset = args32.unencoded_offset; 54147c0c7269SOmar Sandoval args.compression = args32.compression; 54157c0c7269SOmar Sandoval args.encryption = args32.encryption; 54167c0c7269SOmar Sandoval memcpy(args.reserved, args32.reserved, sizeof(args.reserved)); 54177c0c7269SOmar Sandoval #else 54187c0c7269SOmar Sandoval return -ENOTTY; 54197c0c7269SOmar Sandoval #endif 54207c0c7269SOmar Sandoval } else { 54217c0c7269SOmar Sandoval if (copy_from_user(&args, argp, sizeof(args))) { 54227c0c7269SOmar Sandoval ret = -EFAULT; 54237c0c7269SOmar Sandoval goto out_acct; 54247c0c7269SOmar Sandoval } 54257c0c7269SOmar Sandoval } 54267c0c7269SOmar Sandoval 54277c0c7269SOmar Sandoval ret = -EINVAL; 54287c0c7269SOmar Sandoval if (args.flags != 0) 54297c0c7269SOmar Sandoval goto out_acct; 54307c0c7269SOmar Sandoval if (memchr_inv(args.reserved, 0, sizeof(args.reserved))) 54317c0c7269SOmar Sandoval goto out_acct; 54327c0c7269SOmar Sandoval if (args.compression == BTRFS_ENCODED_IO_COMPRESSION_NONE && 54337c0c7269SOmar Sandoval args.encryption == BTRFS_ENCODED_IO_ENCRYPTION_NONE) 54347c0c7269SOmar Sandoval goto out_acct; 54357c0c7269SOmar Sandoval if (args.compression >= BTRFS_ENCODED_IO_COMPRESSION_TYPES || 54367c0c7269SOmar Sandoval args.encryption >= BTRFS_ENCODED_IO_ENCRYPTION_TYPES) 54377c0c7269SOmar Sandoval goto out_acct; 54387c0c7269SOmar Sandoval if (args.unencoded_offset > args.unencoded_len) 54397c0c7269SOmar Sandoval goto out_acct; 54407c0c7269SOmar Sandoval if (args.len > args.unencoded_len - args.unencoded_offset) 54417c0c7269SOmar Sandoval goto out_acct; 54427c0c7269SOmar Sandoval 54437c0c7269SOmar Sandoval ret = import_iovec(WRITE, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), 54447c0c7269SOmar Sandoval &iov, &iter); 54457c0c7269SOmar Sandoval if (ret < 0) 54467c0c7269SOmar Sandoval goto out_acct; 54477c0c7269SOmar Sandoval 54487c0c7269SOmar Sandoval file_start_write(file); 54497c0c7269SOmar Sandoval 54507c0c7269SOmar Sandoval if (iov_iter_count(&iter) == 0) { 54517c0c7269SOmar Sandoval ret = 0; 54527c0c7269SOmar Sandoval goto out_end_write; 54537c0c7269SOmar Sandoval } 54547c0c7269SOmar Sandoval pos = args.offset; 54557c0c7269SOmar Sandoval ret = rw_verify_area(WRITE, file, &pos, args.len); 54567c0c7269SOmar Sandoval if (ret < 0) 54577c0c7269SOmar Sandoval goto out_end_write; 54587c0c7269SOmar Sandoval 54597c0c7269SOmar Sandoval init_sync_kiocb(&kiocb, file); 54607c0c7269SOmar Sandoval ret = kiocb_set_rw_flags(&kiocb, 0); 54617c0c7269SOmar Sandoval if (ret) 54627c0c7269SOmar Sandoval goto out_end_write; 54637c0c7269SOmar Sandoval kiocb.ki_pos = pos; 54647c0c7269SOmar Sandoval 54657c0c7269SOmar Sandoval ret = btrfs_do_write_iter(&kiocb, &iter, &args); 54667c0c7269SOmar Sandoval if (ret > 0) 54677c0c7269SOmar Sandoval fsnotify_modify(file); 54687c0c7269SOmar Sandoval 54697c0c7269SOmar Sandoval out_end_write: 54707c0c7269SOmar Sandoval file_end_write(file); 54717c0c7269SOmar Sandoval kfree(iov); 54727c0c7269SOmar Sandoval out_acct: 54737c0c7269SOmar Sandoval if (ret > 0) 54747c0c7269SOmar Sandoval add_wchar(current, ret); 54757c0c7269SOmar Sandoval inc_syscw(current); 54767c0c7269SOmar Sandoval return ret; 54777c0c7269SOmar Sandoval } 54787c0c7269SOmar Sandoval 5479f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 5480f46b5a66SChristoph Hellwig cmd, unsigned long arg) 5481f46b5a66SChristoph Hellwig { 54820b246afaSJeff Mahoney struct inode *inode = file_inode(file); 54830b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 54840b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 54854bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 5486f46b5a66SChristoph Hellwig 5487f46b5a66SChristoph Hellwig switch (cmd) { 54886cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 5489dc408ccdSSahil Kang return btrfs_ioctl_getversion(inode, argp); 549040cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 5491b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 549240cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 549340cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 5494f7039b1dSLi Dongyang case FITRIM: 5495b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 5496f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 5497fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 5498fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 5499fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 55003de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 5501fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 55026f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 55036f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 550476dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 5505949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 5506949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 5507949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 55080caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 55099ad12305SSahil Kang return btrfs_ioctl_subvol_getflags(inode, argp); 55100caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 55110caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 55126ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 55136ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 5514f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 55151e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 55161e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 55171e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 5518f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 5519198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 5520f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 55212ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 5522f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 5523da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 55246b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 55256b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 5526475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 55272ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 5528475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 55292ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 5530ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 55319ad12305SSahil Kang return btrfs_ioctl_tree_search(inode, argp); 5532cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 55339ad12305SSahil Kang return btrfs_ioctl_tree_search_v2(inode, argp); 5534ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 5535dc408ccdSSahil Kang return btrfs_ioctl_ino_lookup(root, argp); 5536d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 5537d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 5538d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 5539d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 5540d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 5541d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 55421406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 55432ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 55449b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 55459b199859SFilipe David Borba Manana int ret; 55469b199859SFilipe David Borba Manana 55479db4dc24SNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 55489b199859SFilipe David Borba Manana if (ret) 55499b199859SFilipe David Borba Manana return ret; 55500b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 55512fad4e83SDavid Sterba /* 55522fad4e83SDavid Sterba * The transaction thread may want to do more work, 555301327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 55542fad4e83SDavid Sterba * processing uncleaned subvols. 55552fad4e83SDavid Sterba */ 55560b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 55579b199859SFilipe David Borba Manana return ret; 55589b199859SFilipe David Borba Manana } 555946204592SSage Weil case BTRFS_IOC_START_SYNC: 55609a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 556146204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 55622ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 5563475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 5564b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 5565475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 55662ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 5567475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 55682ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 5569c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 55709ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 5571837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 55722ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 557319a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 55742ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 55758ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 55768ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 5577abccd00fSHugo Mills #ifdef CONFIG_64BIT 5578abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 5579abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 5580abccd00fSHugo Mills #endif 558131db9f7cSAlexander Block case BTRFS_IOC_SEND: 55829ad12305SSahil Kang return _btrfs_ioctl_send(inode, argp, false); 55832351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 55842351f431SJosef Bacik case BTRFS_IOC_SEND_32: 55859ad12305SSahil Kang return _btrfs_ioctl_send(inode, argp, true); 55862351f431SJosef Bacik #endif 5587c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 55882ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 55895d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5590905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 55915d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5592905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 55935d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5594905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 55955d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5596905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 55972f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 55982f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 55992f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 5600b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 560157254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 5602b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 56033f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 56042ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 56052eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 5606d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 56072eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 5608b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 56092eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 56102eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5611b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 56129ad12305SSahil Kang return btrfs_ioctl_get_subvol_info(inode, argp); 561342e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 5614dc408ccdSSahil Kang return btrfs_ioctl_get_subvol_rootref(root, argp); 561523d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 561623d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 561714605409SBoris Burkov case FS_IOC_ENABLE_VERITY: 561814605409SBoris Burkov return fsverity_ioctl_enable(file, (const void __user *)argp); 561914605409SBoris Burkov case FS_IOC_MEASURE_VERITY: 562014605409SBoris Burkov return fsverity_ioctl_measure(file, argp); 56211881fba8SOmar Sandoval case BTRFS_IOC_ENCODED_READ: 56221881fba8SOmar Sandoval return btrfs_ioctl_encoded_read(file, argp, false); 56237c0c7269SOmar Sandoval case BTRFS_IOC_ENCODED_WRITE: 56247c0c7269SOmar Sandoval return btrfs_ioctl_encoded_write(file, argp, false); 56251881fba8SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 56261881fba8SOmar Sandoval case BTRFS_IOC_ENCODED_READ_32: 56271881fba8SOmar Sandoval return btrfs_ioctl_encoded_read(file, argp, true); 56287c0c7269SOmar Sandoval case BTRFS_IOC_ENCODED_WRITE_32: 56297c0c7269SOmar Sandoval return btrfs_ioctl_encoded_write(file, argp, true); 56301881fba8SOmar Sandoval #endif 5631f46b5a66SChristoph Hellwig } 5632f46b5a66SChristoph Hellwig 5633f46b5a66SChristoph Hellwig return -ENOTTY; 5634f46b5a66SChristoph Hellwig } 56354c63c245SLuke Dashjr 56364c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 56374c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 56384c63c245SLuke Dashjr { 56392a362249SJeff Mahoney /* 56402a362249SJeff Mahoney * These all access 32-bit values anyway so no further 56412a362249SJeff Mahoney * handling is necessary. 56422a362249SJeff Mahoney */ 56434c63c245SLuke Dashjr switch (cmd) { 56444c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 56454c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 56464c63c245SLuke Dashjr break; 56474c63c245SLuke Dashjr } 56484c63c245SLuke Dashjr 56494c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 56504c63c245SLuke Dashjr } 56514c63c245SLuke Dashjr #endif 5652