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) { 500*7b47ef52SChristoph Hellwig if (!device->bdev || !bdev_max_discard_sectors(device->bdev)) 501f7039b1dSLi Dongyang continue; 502f7039b1dSLi Dongyang num_devices++; 503*7b47ef52SChristoph 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 5434d4340c9SChristian Brauner static noinline int create_subvol(struct user_namespace *mnt_userns, 5444d4340c9SChristian Brauner struct inode *dir, struct dentry *dentry, 54552f75f4fSDavid Sterba const char *name, int namelen, 5468696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 547f46b5a66SChristoph Hellwig { 5480b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 549f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 550f46b5a66SChristoph Hellwig struct btrfs_key key; 55149a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 552f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 553f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 554d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 55576dda93cSYan, Zheng struct btrfs_root *new_root; 556d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 55795582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 5585662344bSTsutomu Itoh struct inode *inode; 559f46b5a66SChristoph Hellwig int ret; 5602dfb1e43SQu Wenruo dev_t anon_dev = 0; 561f46b5a66SChristoph Hellwig u64 objectid; 5623de4586cSChris Mason u64 index = 0; 563f46b5a66SChristoph Hellwig 56449a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 56549a3c4d9SDavid Sterba if (!root_item) 56649a3c4d9SDavid Sterba return -ENOMEM; 56749a3c4d9SDavid Sterba 568543068a2SNikolay Borisov ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); 5692fbe8c8aSAl Viro if (ret) 57049a3c4d9SDavid Sterba goto fail_free; 5716a912213SJosef Bacik 5722dfb1e43SQu Wenruo ret = get_anon_bdev(&anon_dev); 5732dfb1e43SQu Wenruo if (ret < 0) 5742dfb1e43SQu Wenruo goto fail_free; 5752dfb1e43SQu Wenruo 576e09fe2d2SQu Wenruo /* 577e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 57801327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 579e09fe2d2SQu Wenruo */ 58049a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 58149a3c4d9SDavid Sterba ret = -ENOSPC; 58249a3c4d9SDavid Sterba goto fail_free; 58349a3c4d9SDavid Sterba } 584e09fe2d2SQu Wenruo 585d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 5869ed74f2dSJosef Bacik /* 587d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 588d5c12070SMiao Xie * of create_snapshot(). 5899ed74f2dSJosef Bacik */ 590c4c129dbSGu JinXiang ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false); 591d5c12070SMiao Xie if (ret) 59249a3c4d9SDavid Sterba goto fail_free; 593f46b5a66SChristoph Hellwig 594d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 595d5c12070SMiao Xie if (IS_ERR(trans)) { 596d5c12070SMiao Xie ret = PTR_ERR(trans); 597e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 59849a3c4d9SDavid Sterba goto fail_free; 599d5c12070SMiao Xie } 600d5c12070SMiao Xie trans->block_rsv = &block_rsv; 601d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 602f46b5a66SChristoph Hellwig 603a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 6046f72c7e2SArne Jansen if (ret) 6056f72c7e2SArne Jansen goto fail; 6066f72c7e2SArne Jansen 6079631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 6089631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 6098e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 6108e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 6118e8a1e31SJosef Bacik goto fail; 6128e8a1e31SJosef Bacik } 613f46b5a66SChristoph Hellwig 614f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 615f46b5a66SChristoph Hellwig 61649a3c4d9SDavid Sterba inode_item = &root_item->inode; 6173cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6183cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6193cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 620da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6210b246afaSJeff Mahoney fs_info->nodesize); 6223cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 623f46b5a66SChristoph Hellwig 62449a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 62549a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6263cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 62708fe4db1SLi Zefan 62849a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 62949a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 63049a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 63149a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 63249a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 63349a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 634f46b5a66SChristoph Hellwig 63549a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 63649a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 637807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 63849a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 63949a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 64049a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 64149a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 64249a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 643f46b5a66SChristoph Hellwig 644925baeddSChris Mason btrfs_tree_unlock(leaf); 645f46b5a66SChristoph Hellwig 64669948022SNikolay Borisov btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); 647f46b5a66SChristoph Hellwig 648f46b5a66SChristoph Hellwig key.objectid = objectid; 6495d4f98a2SYan Zheng key.offset = 0; 650962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 6510b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 65249a3c4d9SDavid Sterba root_item); 65367addf29SFilipe Manana if (ret) { 65467addf29SFilipe Manana /* 65567addf29SFilipe Manana * Since we don't abort the transaction in this case, free the 65667addf29SFilipe Manana * tree block so that we don't leak space and leave the 65767addf29SFilipe Manana * filesystem in an inconsistent state (an extent item in the 6587a163608SFilipe Manana * extent tree with a backreference for a root that does not 659212a58fdSFilipe Manana * exists). 66067addf29SFilipe Manana */ 661212a58fdSFilipe Manana btrfs_tree_lock(leaf); 662212a58fdSFilipe Manana btrfs_clean_tree_block(leaf); 663212a58fdSFilipe Manana btrfs_tree_unlock(leaf); 6647a163608SFilipe Manana btrfs_free_tree_block(trans, objectid, leaf, 0, 1); 66567addf29SFilipe Manana free_extent_buffer(leaf); 666f46b5a66SChristoph Hellwig goto fail; 66767addf29SFilipe Manana } 66867addf29SFilipe Manana 66967addf29SFilipe Manana free_extent_buffer(leaf); 67067addf29SFilipe Manana leaf = NULL; 671f46b5a66SChristoph Hellwig 67276dda93cSYan, Zheng key.offset = (u64)-1; 6732dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 67479787eaaSJeff Mahoney if (IS_ERR(new_root)) { 6752dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 67679787eaaSJeff Mahoney ret = PTR_ERR(new_root); 67766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 67879787eaaSJeff Mahoney goto fail; 67979787eaaSJeff Mahoney } 6802dfb1e43SQu Wenruo /* Freeing will be done in btrfs_put_root() of new_root */ 6812dfb1e43SQu Wenruo anon_dev = 0; 68276dda93cSYan, Zheng 683221581e4SJosef Bacik ret = btrfs_record_root_in_trans(trans, new_root); 684221581e4SJosef Bacik if (ret) { 685221581e4SJosef Bacik btrfs_put_root(new_root); 686221581e4SJosef Bacik btrfs_abort_transaction(trans, ret); 687221581e4SJosef Bacik goto fail; 688221581e4SJosef Bacik } 68976dda93cSYan, Zheng 6904d4340c9SChristian Brauner ret = btrfs_create_subvol_root(trans, new_root, root, mnt_userns); 69100246528SJosef Bacik btrfs_put_root(new_root); 692ce598979SMark Fasheh if (ret) { 693ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 69466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 695ce598979SMark Fasheh goto fail; 696ce598979SMark Fasheh } 697ce598979SMark Fasheh 698f46b5a66SChristoph Hellwig /* 699f46b5a66SChristoph Hellwig * insert the directory item 700f46b5a66SChristoph Hellwig */ 701877574e2SNikolay Borisov ret = btrfs_set_inode_index(BTRFS_I(dir), &index); 70279787eaaSJeff Mahoney if (ret) { 70366642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 70479787eaaSJeff Mahoney goto fail; 70579787eaaSJeff Mahoney } 7063de4586cSChris Mason 707684572dfSLu Fengqi ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key, 7083de4586cSChris Mason BTRFS_FT_DIR, index); 70979787eaaSJeff Mahoney if (ret) { 71066642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 711f46b5a66SChristoph Hellwig goto fail; 71279787eaaSJeff Mahoney } 7130660b5afSChris Mason 7146ef06d27SNikolay Borisov btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); 7159a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(dir)); 716c7e54b51SJosef Bacik if (ret) { 717c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 718c7e54b51SJosef Bacik goto fail; 719c7e54b51SJosef Bacik } 72052c26179SYan Zheng 7216025c19fSLu Fengqi ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid, 7224a0cc7caSNikolay Borisov btrfs_ino(BTRFS_I(dir)), index, name, namelen); 723c7e54b51SJosef Bacik if (ret) { 724c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 725c7e54b51SJosef Bacik goto fail; 726c7e54b51SJosef Bacik } 7270660b5afSChris Mason 728cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7296bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 730dd5f9615SStefan Behrens if (ret) 73166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 732dd5f9615SStefan Behrens 733f46b5a66SChristoph Hellwig fail: 73449a3c4d9SDavid Sterba kfree(root_item); 735d5c12070SMiao Xie trans->block_rsv = NULL; 736d5c12070SMiao Xie trans->bytes_reserved = 0; 737e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 738de6e8200SLiu Bo 7391b58ae0eSFilipe Manana if (ret) 7401b58ae0eSFilipe Manana btrfs_end_transaction(trans); 7411b58ae0eSFilipe Manana else 7421b58ae0eSFilipe Manana ret = btrfs_commit_transaction(trans); 7431a65e24bSChris Mason 7445662344bSTsutomu Itoh if (!ret) { 7455662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 746de6e8200SLiu Bo if (IS_ERR(inode)) 747de6e8200SLiu Bo return PTR_ERR(inode); 7485662344bSTsutomu Itoh d_instantiate(dentry, inode); 7495662344bSTsutomu Itoh } 750f46b5a66SChristoph Hellwig return ret; 75149a3c4d9SDavid Sterba 75249a3c4d9SDavid Sterba fail_free: 7532dfb1e43SQu Wenruo if (anon_dev) 7542dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 75549a3c4d9SDavid Sterba kfree(root_item); 75649a3c4d9SDavid Sterba return ret; 757f46b5a66SChristoph Hellwig } 758f46b5a66SChristoph Hellwig 759e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7609babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 761e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 762f46b5a66SChristoph Hellwig { 7630b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7642e4bfab9SYan, Zheng struct inode *inode; 765f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 766f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7672e4bfab9SYan, Zheng int ret; 768f46b5a66SChristoph Hellwig 769813febdbSJosef Bacik /* We do not support snapshotting right now. */ 770813febdbSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 771813febdbSJosef Bacik btrfs_warn(fs_info, 772813febdbSJosef Bacik "extent tree v2 doesn't support snapshotting yet"); 773813febdbSJosef Bacik return -EOPNOTSUPP; 774813febdbSJosef Bacik } 775813febdbSJosef Bacik 77692a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 777f46b5a66SChristoph Hellwig return -EINVAL; 778f46b5a66SChristoph Hellwig 779eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 780eede2bf3SOmar Sandoval btrfs_warn(fs_info, 781eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 782eede2bf3SOmar Sandoval return -ETXTBSY; 783eede2bf3SOmar Sandoval } 784eede2bf3SOmar Sandoval 78523269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 786a1ee7362SDavid Sterba if (!pending_snapshot) 787a1ee7362SDavid Sterba return -ENOMEM; 788a1ee7362SDavid Sterba 7892dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 7902dfb1e43SQu Wenruo if (ret < 0) 7912dfb1e43SQu Wenruo goto free_pending; 792b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 79323269bf5SDavid Sterba GFP_KERNEL); 7948546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 7958546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 796b0c0ea63SDavid Sterba ret = -ENOMEM; 797b0c0ea63SDavid Sterba goto free_pending; 798b0c0ea63SDavid Sterba } 799b0c0ea63SDavid Sterba 80066d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 80166d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 802d5c12070SMiao Xie /* 803d5c12070SMiao Xie * 1 - parent dir inode 804d5c12070SMiao Xie * 2 - dir entries 805d5c12070SMiao Xie * 1 - root item 806d5c12070SMiao Xie * 2 - root ref/backref 807d5c12070SMiao Xie * 1 - root of snapshot 808dd5f9615SStefan Behrens * 1 - UUID item 809d5c12070SMiao Xie */ 810d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 811dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 812ee3441b4SJeff Mahoney false); 813d5c12070SMiao Xie if (ret) 814c11fbb6eSRobbie Ko goto free_pending; 815d5c12070SMiao Xie 816a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 817a22285a6SYan, Zheng pending_snapshot->root = root; 818b83cc969SLi Zefan pending_snapshot->readonly = readonly; 819e9662f70SMiao Xie pending_snapshot->dir = dir; 8208696c533SMiao Xie pending_snapshot->inherit = inherit; 821a22285a6SYan, Zheng 822d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 823a22285a6SYan, Zheng if (IS_ERR(trans)) { 824a22285a6SYan, Zheng ret = PTR_ERR(trans); 825a22285a6SYan, Zheng goto fail; 826a22285a6SYan, Zheng } 827a22285a6SYan, Zheng 82828b21c55SFilipe Manana trans->pending_snapshot = pending_snapshot; 8299babda9fSNikolay Borisov 8303a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 831aec8030aSMiao Xie if (ret) 832c37b2b62SJosef Bacik goto fail; 833a22285a6SYan, Zheng 834a22285a6SYan, Zheng ret = pending_snapshot->error; 835f46b5a66SChristoph Hellwig if (ret) 8362e4bfab9SYan, Zheng goto fail; 837f46b5a66SChristoph Hellwig 838d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 839d3797308SChris Mason if (ret) 840d3797308SChris Mason goto fail; 841d3797308SChris Mason 8422b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8432e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8442e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8452e4bfab9SYan, Zheng goto fail; 8462e4bfab9SYan, Zheng } 8475662344bSTsutomu Itoh 8482e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8492e4bfab9SYan, Zheng ret = 0; 8502dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8512e4bfab9SYan, Zheng fail: 8522dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 8532dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8542dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 85500246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 856e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 857b0c0ea63SDavid Sterba free_pending: 8582dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8592dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 860b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8618546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 862a1ee7362SDavid Sterba kfree(pending_snapshot); 863a1ee7362SDavid Sterba 864f46b5a66SChristoph Hellwig return ret; 865f46b5a66SChristoph Hellwig } 866f46b5a66SChristoph Hellwig 8674260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8684260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8694260f7c7SSage Weil * whether the type of victim is right. 8704260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8714260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8724260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8734260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8744260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8754260f7c7SSage Weil * a. be owner of dir, or 8764260f7c7SSage Weil * b. be owner of victim, or 8774260f7c7SSage Weil * c. have CAP_FOWNER capability 87801327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 8794260f7c7SSage Weil * links pointing to it. 8804260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8814260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 8824260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 8834260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 8844260f7c7SSage Weil * nfs_async_unlink(). 8854260f7c7SSage Weil */ 8864260f7c7SSage Weil 887c4ed533bSChristian Brauner static int btrfs_may_delete(struct user_namespace *mnt_userns, 888c4ed533bSChristian Brauner struct inode *dir, struct dentry *victim, int isdir) 8894260f7c7SSage Weil { 8904260f7c7SSage Weil int error; 8914260f7c7SSage Weil 8922b0143b5SDavid Howells if (d_really_is_negative(victim)) 8934260f7c7SSage Weil return -ENOENT; 8944260f7c7SSage Weil 8952b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 8964fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 8974260f7c7SSage Weil 898c4ed533bSChristian Brauner error = inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); 8994260f7c7SSage Weil if (error) 9004260f7c7SSage Weil return error; 9014260f7c7SSage Weil if (IS_APPEND(dir)) 9024260f7c7SSage Weil return -EPERM; 903c4ed533bSChristian Brauner if (check_sticky(mnt_userns, dir, d_inode(victim)) || 904ba73d987SChristian Brauner IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) || 905ba73d987SChristian Brauner IS_SWAPFILE(d_inode(victim))) 9064260f7c7SSage Weil return -EPERM; 9074260f7c7SSage Weil if (isdir) { 908e36cb0b8SDavid Howells if (!d_is_dir(victim)) 9094260f7c7SSage Weil return -ENOTDIR; 9104260f7c7SSage Weil if (IS_ROOT(victim)) 9114260f7c7SSage Weil return -EBUSY; 912e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 9134260f7c7SSage Weil return -EISDIR; 9144260f7c7SSage Weil if (IS_DEADDIR(dir)) 9154260f7c7SSage Weil return -ENOENT; 9164260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 9174260f7c7SSage Weil return -EBUSY; 9184260f7c7SSage Weil return 0; 9194260f7c7SSage Weil } 9204260f7c7SSage Weil 921cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 9224d4340c9SChristian Brauner static inline int btrfs_may_create(struct user_namespace *mnt_userns, 9234d4340c9SChristian Brauner struct inode *dir, struct dentry *child) 924cb8e7090SChristoph Hellwig { 9252b0143b5SDavid Howells if (d_really_is_positive(child)) 926cb8e7090SChristoph Hellwig return -EEXIST; 927cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 928cb8e7090SChristoph Hellwig return -ENOENT; 9294d4340c9SChristian Brauner if (!fsuidgid_has_mapping(dir->i_sb, mnt_userns)) 9305474bf40SChristian Brauner return -EOVERFLOW; 9314d4340c9SChristian Brauner return inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); 932cb8e7090SChristoph Hellwig } 933cb8e7090SChristoph Hellwig 934cb8e7090SChristoph Hellwig /* 935cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 936cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 937cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 938cb8e7090SChristoph Hellwig */ 93992872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 9404d4340c9SChristian Brauner struct user_namespace *mnt_userns, 94152f75f4fSDavid Sterba const char *name, int namelen, 94272fd032eSSage Weil struct btrfs_root *snap_src, 9439babda9fSNikolay Borisov bool readonly, 9448696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 945cb8e7090SChristoph Hellwig { 9462b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9470b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 948cb8e7090SChristoph Hellwig struct dentry *dentry; 949cb8e7090SChristoph Hellwig int error; 950cb8e7090SChristoph Hellwig 95100235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 95200235411SAl Viro if (error == -EINTR) 95300235411SAl Viro return error; 954cb8e7090SChristoph Hellwig 9554d4340c9SChristian Brauner dentry = lookup_one(mnt_userns, name, parent->dentry, namelen); 956cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 957cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 958cb8e7090SChristoph Hellwig goto out_unlock; 959cb8e7090SChristoph Hellwig 9604d4340c9SChristian Brauner error = btrfs_may_create(mnt_userns, dir, dentry); 961cb8e7090SChristoph Hellwig if (error) 962a874a63eSLiu Bo goto out_dput; 963cb8e7090SChristoph Hellwig 9649c52057cSChris Mason /* 9659c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9669c52057cSChris Mason * check for them now when we can safely fail 9679c52057cSChris Mason */ 9689c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 9699c52057cSChris Mason dir->i_ino, name, 9709c52057cSChris Mason namelen); 9719c52057cSChris Mason if (error) 9729c52057cSChris Mason goto out_dput; 9739c52057cSChris Mason 9740b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 97576dda93cSYan, Zheng 97676dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 97776dda93cSYan, Zheng goto out_up_read; 97876dda93cSYan, Zheng 9799babda9fSNikolay Borisov if (snap_src) 9809babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 9819babda9fSNikolay Borisov else 9824d4340c9SChristian Brauner error = create_subvol(mnt_userns, dir, dentry, name, namelen, inherit); 9839babda9fSNikolay Borisov 98476dda93cSYan, Zheng if (!error) 98576dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 98676dda93cSYan, Zheng out_up_read: 9870b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 988cb8e7090SChristoph Hellwig out_dput: 989cb8e7090SChristoph Hellwig dput(dentry); 990cb8e7090SChristoph Hellwig out_unlock: 99164708539SJosef Bacik btrfs_inode_unlock(dir, 0); 992cb8e7090SChristoph Hellwig return error; 993cb8e7090SChristoph Hellwig } 994cb8e7090SChristoph Hellwig 995c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 9964d4340c9SChristian Brauner struct user_namespace *mnt_userns, 997c11fbb6eSRobbie Ko const char *name, int namelen, 998c11fbb6eSRobbie Ko struct btrfs_root *root, 999c11fbb6eSRobbie Ko bool readonly, 1000c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 1001c11fbb6eSRobbie Ko { 1002c11fbb6eSRobbie Ko int ret; 1003c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 1004c11fbb6eSRobbie Ko 1005c11fbb6eSRobbie Ko /* 1006c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 1007c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 1008c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 1009c11fbb6eSRobbie Ko */ 1010c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 1011c11fbb6eSRobbie Ko 1012f9baa501SFilipe Manana ret = btrfs_start_delalloc_snapshot(root, false); 1013c11fbb6eSRobbie Ko if (ret) 1014c11fbb6eSRobbie Ko goto out; 1015c11fbb6eSRobbie Ko 1016c11fbb6eSRobbie Ko /* 1017c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 1018c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 1019c11fbb6eSRobbie Ko * creation. 1020c11fbb6eSRobbie Ko */ 1021c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 1022c11fbb6eSRobbie Ko snapshot_force_cow = true; 1023c11fbb6eSRobbie Ko 1024c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 1025c11fbb6eSRobbie Ko 10264d4340c9SChristian Brauner ret = btrfs_mksubvol(parent, mnt_userns, name, namelen, 1027c11fbb6eSRobbie Ko root, readonly, inherit); 1028c11fbb6eSRobbie Ko out: 1029c11fbb6eSRobbie Ko if (snapshot_force_cow) 1030c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 1031c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 1032c11fbb6eSRobbie Ko return ret; 1033c11fbb6eSRobbie Ko } 1034c11fbb6eSRobbie Ko 1035d5633b0dSQu Wenruo /* 1036d5633b0dSQu Wenruo * Defrag specific helper to get an extent map. 1037d5633b0dSQu Wenruo * 1038d5633b0dSQu Wenruo * Differences between this and btrfs_get_extent() are: 1039d5633b0dSQu Wenruo * 1040d5633b0dSQu Wenruo * - No extent_map will be added to inode->extent_tree 1041d5633b0dSQu Wenruo * To reduce memory usage in the long run. 1042d5633b0dSQu Wenruo * 1043d5633b0dSQu Wenruo * - Extra optimization to skip file extents older than @newer_than 1044d5633b0dSQu Wenruo * By using btrfs_search_forward() we can skip entire file ranges that 1045d5633b0dSQu Wenruo * have extents created in past transactions, because btrfs_search_forward() 1046d5633b0dSQu Wenruo * will not visit leaves and nodes with a generation smaller than given 1047d5633b0dSQu Wenruo * minimal generation threshold (@newer_than). 1048d5633b0dSQu Wenruo * 1049d5633b0dSQu Wenruo * Return valid em if we find a file extent matching the requirement. 1050d5633b0dSQu Wenruo * Return NULL if we can not find a file extent matching the requirement. 1051d5633b0dSQu Wenruo * 1052d5633b0dSQu Wenruo * Return ERR_PTR() for error. 1053d5633b0dSQu Wenruo */ 1054d5633b0dSQu Wenruo static struct extent_map *defrag_get_extent(struct btrfs_inode *inode, 1055d5633b0dSQu Wenruo u64 start, u64 newer_than) 1056d5633b0dSQu Wenruo { 1057d5633b0dSQu Wenruo struct btrfs_root *root = inode->root; 1058d5633b0dSQu Wenruo struct btrfs_file_extent_item *fi; 1059d5633b0dSQu Wenruo struct btrfs_path path = { 0 }; 1060d5633b0dSQu Wenruo struct extent_map *em; 1061d5633b0dSQu Wenruo struct btrfs_key key; 1062d5633b0dSQu Wenruo u64 ino = btrfs_ino(inode); 1063d5633b0dSQu Wenruo int ret; 1064d5633b0dSQu Wenruo 1065d5633b0dSQu Wenruo em = alloc_extent_map(); 1066d5633b0dSQu Wenruo if (!em) { 1067d5633b0dSQu Wenruo ret = -ENOMEM; 1068d5633b0dSQu Wenruo goto err; 1069d5633b0dSQu Wenruo } 1070d5633b0dSQu Wenruo 1071d5633b0dSQu Wenruo key.objectid = ino; 1072d5633b0dSQu Wenruo key.type = BTRFS_EXTENT_DATA_KEY; 1073d5633b0dSQu Wenruo key.offset = start; 1074d5633b0dSQu Wenruo 1075d5633b0dSQu Wenruo if (newer_than) { 1076d5633b0dSQu Wenruo ret = btrfs_search_forward(root, &key, &path, newer_than); 1077d5633b0dSQu Wenruo if (ret < 0) 1078d5633b0dSQu Wenruo goto err; 1079d5633b0dSQu Wenruo /* Can't find anything newer */ 1080d5633b0dSQu Wenruo if (ret > 0) 1081d5633b0dSQu Wenruo goto not_found; 1082d5633b0dSQu Wenruo } else { 1083d5633b0dSQu Wenruo ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); 1084d5633b0dSQu Wenruo if (ret < 0) 1085d5633b0dSQu Wenruo goto err; 1086d5633b0dSQu Wenruo } 1087d5633b0dSQu Wenruo if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) { 1088d5633b0dSQu Wenruo /* 1089d5633b0dSQu Wenruo * If btrfs_search_slot() makes path to point beyond nritems, 1090d5633b0dSQu Wenruo * we should not have an empty leaf, as this inode must at 1091d5633b0dSQu Wenruo * least have its INODE_ITEM. 1092d5633b0dSQu Wenruo */ 1093d5633b0dSQu Wenruo ASSERT(btrfs_header_nritems(path.nodes[0])); 1094d5633b0dSQu Wenruo path.slots[0] = btrfs_header_nritems(path.nodes[0]) - 1; 1095d5633b0dSQu Wenruo } 1096d5633b0dSQu Wenruo btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); 1097d5633b0dSQu Wenruo /* Perfect match, no need to go one slot back */ 1098d5633b0dSQu Wenruo if (key.objectid == ino && key.type == BTRFS_EXTENT_DATA_KEY && 1099d5633b0dSQu Wenruo key.offset == start) 1100d5633b0dSQu Wenruo goto iterate; 1101d5633b0dSQu Wenruo 1102d5633b0dSQu Wenruo /* We didn't find a perfect match, needs to go one slot back */ 1103d5633b0dSQu Wenruo if (path.slots[0] > 0) { 1104d5633b0dSQu Wenruo btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); 1105d5633b0dSQu Wenruo if (key.objectid == ino && key.type == BTRFS_EXTENT_DATA_KEY) 1106d5633b0dSQu Wenruo path.slots[0]--; 1107d5633b0dSQu Wenruo } 1108d5633b0dSQu Wenruo 1109d5633b0dSQu Wenruo iterate: 1110d5633b0dSQu Wenruo /* Iterate through the path to find a file extent covering @start */ 1111d5633b0dSQu Wenruo while (true) { 1112d5633b0dSQu Wenruo u64 extent_end; 1113d5633b0dSQu Wenruo 1114d5633b0dSQu Wenruo if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) 1115d5633b0dSQu Wenruo goto next; 1116d5633b0dSQu Wenruo 1117d5633b0dSQu Wenruo btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); 1118d5633b0dSQu Wenruo 1119d5633b0dSQu Wenruo /* 1120d5633b0dSQu Wenruo * We may go one slot back to INODE_REF/XATTR item, then 1121d5633b0dSQu Wenruo * need to go forward until we reach an EXTENT_DATA. 1122d5633b0dSQu Wenruo * But we should still has the correct ino as key.objectid. 1123d5633b0dSQu Wenruo */ 1124d5633b0dSQu Wenruo if (WARN_ON(key.objectid < ino) || key.type < BTRFS_EXTENT_DATA_KEY) 1125d5633b0dSQu Wenruo goto next; 1126d5633b0dSQu Wenruo 1127d5633b0dSQu Wenruo /* It's beyond our target range, definitely not extent found */ 1128d5633b0dSQu Wenruo if (key.objectid > ino || key.type > BTRFS_EXTENT_DATA_KEY) 1129d5633b0dSQu Wenruo goto not_found; 1130d5633b0dSQu Wenruo 1131d5633b0dSQu Wenruo /* 1132d5633b0dSQu Wenruo * | |<- File extent ->| 1133d5633b0dSQu Wenruo * \- start 1134d5633b0dSQu Wenruo * 1135d5633b0dSQu Wenruo * This means there is a hole between start and key.offset. 1136d5633b0dSQu Wenruo */ 1137d5633b0dSQu Wenruo if (key.offset > start) { 1138d5633b0dSQu Wenruo em->start = start; 1139d5633b0dSQu Wenruo em->orig_start = start; 1140d5633b0dSQu Wenruo em->block_start = EXTENT_MAP_HOLE; 1141d5633b0dSQu Wenruo em->len = key.offset - start; 1142d5633b0dSQu Wenruo break; 1143d5633b0dSQu Wenruo } 1144d5633b0dSQu Wenruo 1145d5633b0dSQu Wenruo fi = btrfs_item_ptr(path.nodes[0], path.slots[0], 1146d5633b0dSQu Wenruo struct btrfs_file_extent_item); 1147d5633b0dSQu Wenruo extent_end = btrfs_file_extent_end(&path); 1148d5633b0dSQu Wenruo 1149d5633b0dSQu Wenruo /* 1150d5633b0dSQu Wenruo * |<- file extent ->| | 1151d5633b0dSQu Wenruo * \- start 1152d5633b0dSQu Wenruo * 1153d5633b0dSQu Wenruo * We haven't reached start, search next slot. 1154d5633b0dSQu Wenruo */ 1155d5633b0dSQu Wenruo if (extent_end <= start) 1156d5633b0dSQu Wenruo goto next; 1157d5633b0dSQu Wenruo 1158d5633b0dSQu Wenruo /* Now this extent covers @start, convert it to em */ 1159d5633b0dSQu Wenruo btrfs_extent_item_to_extent_map(inode, &path, fi, false, em); 1160d5633b0dSQu Wenruo break; 1161d5633b0dSQu Wenruo next: 1162d5633b0dSQu Wenruo ret = btrfs_next_item(root, &path); 1163d5633b0dSQu Wenruo if (ret < 0) 1164d5633b0dSQu Wenruo goto err; 1165d5633b0dSQu Wenruo if (ret > 0) 1166d5633b0dSQu Wenruo goto not_found; 1167d5633b0dSQu Wenruo } 1168d5633b0dSQu Wenruo btrfs_release_path(&path); 1169d5633b0dSQu Wenruo return em; 1170d5633b0dSQu Wenruo 1171d5633b0dSQu Wenruo not_found: 1172d5633b0dSQu Wenruo btrfs_release_path(&path); 1173d5633b0dSQu Wenruo free_extent_map(em); 1174d5633b0dSQu Wenruo return NULL; 1175d5633b0dSQu Wenruo 1176d5633b0dSQu Wenruo err: 1177d5633b0dSQu Wenruo btrfs_release_path(&path); 1178d5633b0dSQu Wenruo free_extent_map(em); 1179d5633b0dSQu Wenruo return ERR_PTR(ret); 1180d5633b0dSQu Wenruo } 1181d5633b0dSQu Wenruo 1182e9eec721SQu Wenruo static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start, 1183d5633b0dSQu Wenruo u64 newer_than, bool locked) 118417ce6ef8SLiu Bo { 118517ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1186940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 11876c282eb4SLi Zefan struct extent_map *em; 118876068caeSQu Wenruo const u32 sectorsize = BTRFS_I(inode)->root->fs_info->sectorsize; 1189940100a4SChris Mason 1190940100a4SChris Mason /* 1191940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1192940100a4SChris Mason * the full extent lock 1193940100a4SChris Mason */ 1194940100a4SChris Mason read_lock(&em_tree->lock); 119576068caeSQu Wenruo em = lookup_extent_mapping(em_tree, start, sectorsize); 1196940100a4SChris Mason read_unlock(&em_tree->lock); 1197940100a4SChris Mason 1198199257a7SQu Wenruo /* 1199199257a7SQu Wenruo * We can get a merged extent, in that case, we need to re-search 1200199257a7SQu Wenruo * tree to get the original em for defrag. 1201199257a7SQu Wenruo * 1202199257a7SQu Wenruo * If @newer_than is 0 or em::generation < newer_than, we can trust 1203199257a7SQu Wenruo * this em, as either we don't care about the generation, or the 1204199257a7SQu Wenruo * merged extent map will be rejected anyway. 1205199257a7SQu Wenruo */ 1206199257a7SQu Wenruo if (em && test_bit(EXTENT_FLAG_MERGED, &em->flags) && 1207199257a7SQu Wenruo newer_than && em->generation >= newer_than) { 1208199257a7SQu Wenruo free_extent_map(em); 1209199257a7SQu Wenruo em = NULL; 1210199257a7SQu Wenruo } 1211199257a7SQu Wenruo 1212940100a4SChris Mason if (!em) { 1213308d9800SFilipe Manana struct extent_state *cached = NULL; 121476068caeSQu Wenruo u64 end = start + sectorsize - 1; 1215308d9800SFilipe Manana 1216940100a4SChris Mason /* get the big lock and read metadata off disk */ 1217e9eec721SQu Wenruo if (!locked) 1218ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 1219d5633b0dSQu Wenruo em = defrag_get_extent(BTRFS_I(inode), start, newer_than); 1220e9eec721SQu Wenruo if (!locked) 1221e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1222940100a4SChris Mason 12236cf8bfbfSDan Carpenter if (IS_ERR(em)) 12246c282eb4SLi Zefan return NULL; 1225940100a4SChris Mason } 1226940100a4SChris Mason 12276c282eb4SLi Zefan return em; 12286c282eb4SLi Zefan } 12296c282eb4SLi Zefan 1230979b25c3SQu Wenruo static u32 get_extent_max_capacity(const struct extent_map *em) 1231979b25c3SQu Wenruo { 1232979b25c3SQu Wenruo if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) 1233979b25c3SQu Wenruo return BTRFS_MAX_COMPRESSED; 1234979b25c3SQu Wenruo return BTRFS_MAX_EXTENT_SIZE; 1235979b25c3SQu Wenruo } 1236979b25c3SQu Wenruo 1237e9eec721SQu Wenruo static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em, 123875a36a7dSQu Wenruo u32 extent_thresh, u64 newer_than, bool locked) 12396c282eb4SLi Zefan { 12406c282eb4SLi Zefan struct extent_map *next; 12417093f152SQu Wenruo bool ret = false; 12426c282eb4SLi Zefan 12436c282eb4SLi Zefan /* this is the last extent */ 12446c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 12456c282eb4SLi Zefan return false; 12466c282eb4SLi Zefan 1247d5633b0dSQu Wenruo /* 124875a36a7dSQu Wenruo * Here we need to pass @newer_then when checking the next extent, or 124975a36a7dSQu Wenruo * we will hit a case we mark current extent for defrag, but the next 125075a36a7dSQu Wenruo * one will not be a target. 125175a36a7dSQu Wenruo * This will just cause extra IO without really reducing the fragments. 1252d5633b0dSQu Wenruo */ 125375a36a7dSQu Wenruo next = defrag_lookup_extent(inode, em->start + em->len, newer_than, locked); 12547093f152SQu Wenruo /* No more em or hole */ 1255e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 12567093f152SQu Wenruo goto out; 12577093f152SQu Wenruo if (test_bit(EXTENT_FLAG_PREALLOC, &next->flags)) 12587093f152SQu Wenruo goto out; 1259979b25c3SQu Wenruo /* 1260979b25c3SQu Wenruo * If the next extent is at its max capacity, defragging current extent 1261979b25c3SQu Wenruo * makes no sense, as the total number of extents won't change. 1262979b25c3SQu Wenruo */ 1263979b25c3SQu Wenruo if (next->len >= get_extent_max_capacity(em)) 1264979b25c3SQu Wenruo goto out; 126575a36a7dSQu Wenruo /* Skip older extent */ 126675a36a7dSQu Wenruo if (next->generation < newer_than) 126775a36a7dSQu Wenruo goto out; 126875a36a7dSQu Wenruo /* Also check extent size */ 126975a36a7dSQu Wenruo if (next->len >= extent_thresh) 127075a36a7dSQu Wenruo goto out; 127175a36a7dSQu Wenruo 12727093f152SQu Wenruo ret = true; 12737093f152SQu Wenruo out: 12746c282eb4SLi Zefan free_extent_map(next); 12756c282eb4SLi Zefan return ret; 12766c282eb4SLi Zefan } 12776c282eb4SLi Zefan 12784cb5300bSChris Mason /* 12795767b50cSQu Wenruo * Prepare one page to be defragged. 12805767b50cSQu Wenruo * 12815767b50cSQu Wenruo * This will ensure: 12825767b50cSQu Wenruo * 12835767b50cSQu Wenruo * - Returned page is locked and has been set up properly. 12845767b50cSQu Wenruo * - No ordered extent exists in the page. 12855767b50cSQu Wenruo * - The page is uptodate. 12865767b50cSQu Wenruo * 12875767b50cSQu Wenruo * NOTE: Caller should also wait for page writeback after the cluster is 12885767b50cSQu Wenruo * prepared, here we don't do writeback wait for each page. 12895767b50cSQu Wenruo */ 12905767b50cSQu Wenruo static struct page *defrag_prepare_one_page(struct btrfs_inode *inode, 12915767b50cSQu Wenruo pgoff_t index) 1292940100a4SChris Mason { 12935767b50cSQu Wenruo struct address_space *mapping = inode->vfs_inode.i_mapping; 12945767b50cSQu Wenruo gfp_t mask = btrfs_alloc_write_mask(mapping); 12955767b50cSQu Wenruo u64 page_start = (u64)index << PAGE_SHIFT; 12965767b50cSQu Wenruo u64 page_end = page_start + PAGE_SIZE - 1; 12974cb5300bSChris Mason struct extent_state *cached_state = NULL; 12984cb5300bSChris Mason struct page *page; 12995767b50cSQu Wenruo int ret; 13005767b50cSQu Wenruo 1301600a45e1SMiao Xie again: 13025767b50cSQu Wenruo page = find_or_create_page(mapping, index, mask); 13034cb5300bSChris Mason if (!page) 13045767b50cSQu Wenruo return ERR_PTR(-ENOMEM); 13055767b50cSQu Wenruo 130624bcb454SOmar Sandoval /* 130724bcb454SOmar Sandoval * Since we can defragment files opened read-only, we can encounter 130824bcb454SOmar Sandoval * transparent huge pages here (see CONFIG_READ_ONLY_THP_FOR_FS). We 130924bcb454SOmar Sandoval * can't do I/O using huge pages yet, so return an error for now. 131024bcb454SOmar Sandoval * Filesystem transparent huge pages are typically only used for 131124bcb454SOmar Sandoval * executables that explicitly enable them, so this isn't very 131224bcb454SOmar Sandoval * restrictive. 131324bcb454SOmar Sandoval */ 131424bcb454SOmar Sandoval if (PageCompound(page)) { 131524bcb454SOmar Sandoval unlock_page(page); 131624bcb454SOmar Sandoval put_page(page); 131724bcb454SOmar Sandoval return ERR_PTR(-ETXTBSY); 131824bcb454SOmar Sandoval } 13194cb5300bSChris Mason 132032443de3SQu Wenruo ret = set_page_extent_mapped(page); 132132443de3SQu Wenruo if (ret < 0) { 132232443de3SQu Wenruo unlock_page(page); 132332443de3SQu Wenruo put_page(page); 13245767b50cSQu Wenruo return ERR_PTR(ret); 132532443de3SQu Wenruo } 132632443de3SQu Wenruo 13275767b50cSQu Wenruo /* Wait for any existing ordered extent in the range */ 1328600a45e1SMiao Xie while (1) { 13295767b50cSQu Wenruo struct btrfs_ordered_extent *ordered; 13305767b50cSQu Wenruo 13315767b50cSQu Wenruo lock_extent_bits(&inode->io_tree, page_start, page_end, &cached_state); 13325767b50cSQu Wenruo ordered = btrfs_lookup_ordered_range(inode, page_start, PAGE_SIZE); 13335767b50cSQu Wenruo unlock_extent_cached(&inode->io_tree, page_start, page_end, 1334e43bbe5eSDavid Sterba &cached_state); 1335600a45e1SMiao Xie if (!ordered) 1336600a45e1SMiao Xie break; 1337600a45e1SMiao Xie 1338600a45e1SMiao Xie unlock_page(page); 1339c0a43603SNikolay Borisov btrfs_start_ordered_extent(ordered, 1); 1340600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1341600a45e1SMiao Xie lock_page(page); 13421f12bd06SLiu Bo /* 13435767b50cSQu Wenruo * We unlocked the page above, so we need check if it was 13445767b50cSQu Wenruo * released or not. 13451f12bd06SLiu Bo */ 13465767b50cSQu Wenruo if (page->mapping != mapping || !PagePrivate(page)) { 13471f12bd06SLiu Bo unlock_page(page); 134809cbfeafSKirill A. Shutemov put_page(page); 13491f12bd06SLiu Bo goto again; 13501f12bd06SLiu Bo } 1351600a45e1SMiao Xie } 1352600a45e1SMiao Xie 13535767b50cSQu Wenruo /* 13545767b50cSQu Wenruo * Now the page range has no ordered extent any more. Read the page to 13555767b50cSQu Wenruo * make it uptodate. 13565767b50cSQu Wenruo */ 13574cb5300bSChris Mason if (!PageUptodate(page)) { 13584cb5300bSChris Mason btrfs_readpage(NULL, page); 13594cb5300bSChris Mason lock_page(page); 13605767b50cSQu Wenruo if (page->mapping != mapping || !PagePrivate(page)) { 1361600a45e1SMiao Xie unlock_page(page); 136209cbfeafSKirill A. Shutemov put_page(page); 1363600a45e1SMiao Xie goto again; 1364600a45e1SMiao Xie } 13655767b50cSQu Wenruo if (!PageUptodate(page)) { 13665767b50cSQu Wenruo unlock_page(page); 13675767b50cSQu Wenruo put_page(page); 13685767b50cSQu Wenruo return ERR_PTR(-EIO); 13694cb5300bSChris Mason } 13705767b50cSQu Wenruo } 13715767b50cSQu Wenruo return page; 13725767b50cSQu Wenruo } 13734cb5300bSChris Mason 1374eb793cf8SQu Wenruo struct defrag_target_range { 1375eb793cf8SQu Wenruo struct list_head list; 1376eb793cf8SQu Wenruo u64 start; 1377eb793cf8SQu Wenruo u64 len; 1378eb793cf8SQu Wenruo }; 13794cb5300bSChris Mason 13804cb5300bSChris Mason /* 1381eb793cf8SQu Wenruo * Collect all valid target extents. 1382eb793cf8SQu Wenruo * 1383eb793cf8SQu Wenruo * @start: file offset to lookup 1384eb793cf8SQu Wenruo * @len: length to lookup 1385eb793cf8SQu Wenruo * @extent_thresh: file extent size threshold, any extent size >= this value 1386eb793cf8SQu Wenruo * will be ignored 1387eb793cf8SQu Wenruo * @newer_than: only defrag extents newer than this value 1388eb793cf8SQu Wenruo * @do_compress: whether the defrag is doing compression 1389eb793cf8SQu Wenruo * if true, @extent_thresh will be ignored and all regular 1390eb793cf8SQu Wenruo * file extents meeting @newer_than will be targets. 1391e9eec721SQu Wenruo * @locked: if the range has already held extent lock 1392eb793cf8SQu Wenruo * @target_list: list of targets file extents 13934cb5300bSChris Mason */ 1394eb793cf8SQu Wenruo static int defrag_collect_targets(struct btrfs_inode *inode, 1395eb793cf8SQu Wenruo u64 start, u64 len, u32 extent_thresh, 1396eb793cf8SQu Wenruo u64 newer_than, bool do_compress, 1397966d879bSQu Wenruo bool locked, struct list_head *target_list, 1398966d879bSQu Wenruo u64 *last_scanned_ret) 1399eb793cf8SQu Wenruo { 1400966d879bSQu Wenruo bool last_is_target = false; 1401eb793cf8SQu Wenruo u64 cur = start; 1402eb793cf8SQu Wenruo int ret = 0; 1403eb793cf8SQu Wenruo 1404eb793cf8SQu Wenruo while (cur < start + len) { 1405eb793cf8SQu Wenruo struct extent_map *em; 1406eb793cf8SQu Wenruo struct defrag_target_range *new; 1407eb793cf8SQu Wenruo bool next_mergeable = true; 1408eb793cf8SQu Wenruo u64 range_len; 1409eb793cf8SQu Wenruo 1410966d879bSQu Wenruo last_is_target = false; 1411d5633b0dSQu Wenruo em = defrag_lookup_extent(&inode->vfs_inode, cur, 1412d5633b0dSQu Wenruo newer_than, locked); 1413eb793cf8SQu Wenruo if (!em) 1414eb793cf8SQu Wenruo break; 1415eb793cf8SQu Wenruo 1416eb793cf8SQu Wenruo /* Skip hole/inline/preallocated extents */ 1417eb793cf8SQu Wenruo if (em->block_start >= EXTENT_MAP_LAST_BYTE || 1418eb793cf8SQu Wenruo test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) 1419eb793cf8SQu Wenruo goto next; 1420eb793cf8SQu Wenruo 1421eb793cf8SQu Wenruo /* Skip older extent */ 1422eb793cf8SQu Wenruo if (em->generation < newer_than) 1423eb793cf8SQu Wenruo goto next; 1424eb793cf8SQu Wenruo 14250d1ffa22SQu Wenruo /* This em is under writeback, no need to defrag */ 14260d1ffa22SQu Wenruo if (em->generation == (u64)-1) 14270d1ffa22SQu Wenruo goto next; 14280d1ffa22SQu Wenruo 1429eb793cf8SQu Wenruo /* 14300cb5950fSFilipe Manana * Our start offset might be in the middle of an existing extent 14310cb5950fSFilipe Manana * map, so take that into account. 14320cb5950fSFilipe Manana */ 14330cb5950fSFilipe Manana range_len = em->len - (cur - em->start); 14340cb5950fSFilipe Manana /* 14350cb5950fSFilipe Manana * If this range of the extent map is already flagged for delalloc, 14360cb5950fSFilipe Manana * skip it, because: 14370cb5950fSFilipe Manana * 14380cb5950fSFilipe Manana * 1) We could deadlock later, when trying to reserve space for 14390cb5950fSFilipe Manana * delalloc, because in case we can't immediately reserve space 14400cb5950fSFilipe Manana * the flusher can start delalloc and wait for the respective 14410cb5950fSFilipe Manana * ordered extents to complete. The deadlock would happen 14420cb5950fSFilipe Manana * because we do the space reservation while holding the range 14430cb5950fSFilipe Manana * locked, and starting writeback, or finishing an ordered 14440cb5950fSFilipe Manana * extent, requires locking the range; 14450cb5950fSFilipe Manana * 14460cb5950fSFilipe Manana * 2) If there's delalloc there, it means there's dirty pages for 14470cb5950fSFilipe Manana * which writeback has not started yet (we clean the delalloc 14480cb5950fSFilipe Manana * flag when starting writeback and after creating an ordered 14490cb5950fSFilipe Manana * extent). If we mark pages in an adjacent range for defrag, 14500cb5950fSFilipe Manana * then we will have a larger contiguous range for delalloc, 14510cb5950fSFilipe Manana * very likely resulting in a larger extent after writeback is 14520cb5950fSFilipe Manana * triggered (except in a case of free space fragmentation). 14530cb5950fSFilipe Manana */ 14540cb5950fSFilipe Manana if (test_range_bit(&inode->io_tree, cur, cur + range_len - 1, 14550cb5950fSFilipe Manana EXTENT_DELALLOC, 0, NULL)) 14560cb5950fSFilipe Manana goto next; 14570cb5950fSFilipe Manana 14580cb5950fSFilipe Manana /* 1459eb793cf8SQu Wenruo * For do_compress case, we want to compress all valid file 1460eb793cf8SQu Wenruo * extents, thus no @extent_thresh or mergeable check. 1461eb793cf8SQu Wenruo */ 1462eb793cf8SQu Wenruo if (do_compress) 1463eb793cf8SQu Wenruo goto add; 1464eb793cf8SQu Wenruo 1465eb793cf8SQu Wenruo /* Skip too large extent */ 14660cb5950fSFilipe Manana if (range_len >= extent_thresh) 1467eb793cf8SQu Wenruo goto next; 1468eb793cf8SQu Wenruo 1469979b25c3SQu Wenruo /* 1470979b25c3SQu Wenruo * Skip extents already at its max capacity, this is mostly for 1471979b25c3SQu Wenruo * compressed extents, which max cap is only 128K. 1472979b25c3SQu Wenruo */ 1473979b25c3SQu Wenruo if (em->len >= get_extent_max_capacity(em)) 1474979b25c3SQu Wenruo goto next; 1475979b25c3SQu Wenruo 1476e9eec721SQu Wenruo next_mergeable = defrag_check_next_extent(&inode->vfs_inode, em, 147775a36a7dSQu Wenruo extent_thresh, newer_than, locked); 1478eb793cf8SQu Wenruo if (!next_mergeable) { 1479eb793cf8SQu Wenruo struct defrag_target_range *last; 1480eb793cf8SQu Wenruo 1481eb793cf8SQu Wenruo /* Empty target list, no way to merge with last entry */ 1482eb793cf8SQu Wenruo if (list_empty(target_list)) 1483eb793cf8SQu Wenruo goto next; 1484eb793cf8SQu Wenruo last = list_entry(target_list->prev, 1485eb793cf8SQu Wenruo struct defrag_target_range, list); 1486eb793cf8SQu Wenruo /* Not mergeable with last entry */ 1487eb793cf8SQu Wenruo if (last->start + last->len != cur) 1488eb793cf8SQu Wenruo goto next; 1489eb793cf8SQu Wenruo 1490eb793cf8SQu Wenruo /* Mergeable, fall through to add it to @target_list. */ 1491eb793cf8SQu Wenruo } 1492eb793cf8SQu Wenruo 1493eb793cf8SQu Wenruo add: 1494966d879bSQu Wenruo last_is_target = true; 1495eb793cf8SQu Wenruo range_len = min(extent_map_end(em), start + len) - cur; 1496eb793cf8SQu Wenruo /* 1497eb793cf8SQu Wenruo * This one is a good target, check if it can be merged into 1498eb793cf8SQu Wenruo * last range of the target list. 1499eb793cf8SQu Wenruo */ 1500eb793cf8SQu Wenruo if (!list_empty(target_list)) { 1501eb793cf8SQu Wenruo struct defrag_target_range *last; 1502eb793cf8SQu Wenruo 1503eb793cf8SQu Wenruo last = list_entry(target_list->prev, 1504eb793cf8SQu Wenruo struct defrag_target_range, list); 1505eb793cf8SQu Wenruo ASSERT(last->start + last->len <= cur); 1506eb793cf8SQu Wenruo if (last->start + last->len == cur) { 1507eb793cf8SQu Wenruo /* Mergeable, enlarge the last entry */ 1508eb793cf8SQu Wenruo last->len += range_len; 1509eb793cf8SQu Wenruo goto next; 1510eb793cf8SQu Wenruo } 1511eb793cf8SQu Wenruo /* Fall through to allocate a new entry */ 1512eb793cf8SQu Wenruo } 1513eb793cf8SQu Wenruo 1514eb793cf8SQu Wenruo /* Allocate new defrag_target_range */ 1515eb793cf8SQu Wenruo new = kmalloc(sizeof(*new), GFP_NOFS); 1516eb793cf8SQu Wenruo if (!new) { 1517eb793cf8SQu Wenruo free_extent_map(em); 1518eb793cf8SQu Wenruo ret = -ENOMEM; 1519eb793cf8SQu Wenruo break; 1520eb793cf8SQu Wenruo } 1521eb793cf8SQu Wenruo new->start = cur; 1522eb793cf8SQu Wenruo new->len = range_len; 1523eb793cf8SQu Wenruo list_add_tail(&new->list, target_list); 1524eb793cf8SQu Wenruo 1525eb793cf8SQu Wenruo next: 1526eb793cf8SQu Wenruo cur = extent_map_end(em); 1527eb793cf8SQu Wenruo free_extent_map(em); 1528eb793cf8SQu Wenruo } 1529eb793cf8SQu Wenruo if (ret < 0) { 1530eb793cf8SQu Wenruo struct defrag_target_range *entry; 1531eb793cf8SQu Wenruo struct defrag_target_range *tmp; 1532eb793cf8SQu Wenruo 1533eb793cf8SQu Wenruo list_for_each_entry_safe(entry, tmp, target_list, list) { 1534eb793cf8SQu Wenruo list_del_init(&entry->list); 1535eb793cf8SQu Wenruo kfree(entry); 1536eb793cf8SQu Wenruo } 1537eb793cf8SQu Wenruo } 1538966d879bSQu Wenruo if (!ret && last_scanned_ret) { 1539966d879bSQu Wenruo /* 1540966d879bSQu Wenruo * If the last extent is not a target, the caller can skip to 1541966d879bSQu Wenruo * the end of that extent. 1542966d879bSQu Wenruo * Otherwise, we can only go the end of the specified range. 1543966d879bSQu Wenruo */ 1544966d879bSQu Wenruo if (!last_is_target) 1545966d879bSQu Wenruo *last_scanned_ret = max(cur, *last_scanned_ret); 1546966d879bSQu Wenruo else 1547966d879bSQu Wenruo *last_scanned_ret = max(start + len, *last_scanned_ret); 1548966d879bSQu Wenruo } 1549eb793cf8SQu Wenruo return ret; 1550eb793cf8SQu Wenruo } 1551eb793cf8SQu Wenruo 155222b398eeSQu Wenruo #define CLUSTER_SIZE (SZ_256K) 1553a55e65b8SDavid Sterba static_assert(IS_ALIGNED(CLUSTER_SIZE, PAGE_SIZE)); 155422b398eeSQu Wenruo 155522b398eeSQu Wenruo /* 155622b398eeSQu Wenruo * Defrag one contiguous target range. 155722b398eeSQu Wenruo * 155822b398eeSQu Wenruo * @inode: target inode 155922b398eeSQu Wenruo * @target: target range to defrag 156022b398eeSQu Wenruo * @pages: locked pages covering the defrag range 156122b398eeSQu Wenruo * @nr_pages: number of locked pages 156222b398eeSQu Wenruo * 156322b398eeSQu Wenruo * Caller should ensure: 156422b398eeSQu Wenruo * 156522b398eeSQu Wenruo * - Pages are prepared 156622b398eeSQu Wenruo * Pages should be locked, no ordered extent in the pages range, 156722b398eeSQu Wenruo * no writeback. 156822b398eeSQu Wenruo * 156922b398eeSQu Wenruo * - Extent bits are locked 157022b398eeSQu Wenruo */ 157122b398eeSQu Wenruo static int defrag_one_locked_target(struct btrfs_inode *inode, 157222b398eeSQu Wenruo struct defrag_target_range *target, 157322b398eeSQu Wenruo struct page **pages, int nr_pages, 157422b398eeSQu Wenruo struct extent_state **cached_state) 157522b398eeSQu Wenruo { 157622b398eeSQu Wenruo struct btrfs_fs_info *fs_info = inode->root->fs_info; 157722b398eeSQu Wenruo struct extent_changeset *data_reserved = NULL; 157822b398eeSQu Wenruo const u64 start = target->start; 157922b398eeSQu Wenruo const u64 len = target->len; 158022b398eeSQu Wenruo unsigned long last_index = (start + len - 1) >> PAGE_SHIFT; 158122b398eeSQu Wenruo unsigned long start_index = start >> PAGE_SHIFT; 158222b398eeSQu Wenruo unsigned long first_index = page_index(pages[0]); 158322b398eeSQu Wenruo int ret = 0; 158422b398eeSQu Wenruo int i; 158522b398eeSQu Wenruo 158622b398eeSQu Wenruo ASSERT(last_index - first_index + 1 <= nr_pages); 158722b398eeSQu Wenruo 158822b398eeSQu Wenruo ret = btrfs_delalloc_reserve_space(inode, &data_reserved, start, len); 158922b398eeSQu Wenruo if (ret < 0) 159022b398eeSQu Wenruo return ret; 159122b398eeSQu Wenruo clear_extent_bit(&inode->io_tree, start, start + len - 1, 159222b398eeSQu Wenruo EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 159322b398eeSQu Wenruo EXTENT_DEFRAG, 0, 0, cached_state); 159422b398eeSQu Wenruo set_extent_defrag(&inode->io_tree, start, start + len - 1, cached_state); 159522b398eeSQu Wenruo 159622b398eeSQu Wenruo /* Update the page status */ 159722b398eeSQu Wenruo for (i = start_index - first_index; i <= last_index - first_index; i++) { 159822b398eeSQu Wenruo ClearPageChecked(pages[i]); 159922b398eeSQu Wenruo btrfs_page_clamp_set_dirty(fs_info, pages[i], start, len); 160022b398eeSQu Wenruo } 160122b398eeSQu Wenruo btrfs_delalloc_release_extents(inode, len); 160222b398eeSQu Wenruo extent_changeset_free(data_reserved); 160322b398eeSQu Wenruo 160422b398eeSQu Wenruo return ret; 160522b398eeSQu Wenruo } 160622b398eeSQu Wenruo 1607e9eec721SQu Wenruo static int defrag_one_range(struct btrfs_inode *inode, u64 start, u32 len, 1608966d879bSQu Wenruo u32 extent_thresh, u64 newer_than, bool do_compress, 1609966d879bSQu Wenruo u64 *last_scanned_ret) 1610e9eec721SQu Wenruo { 1611e9eec721SQu Wenruo struct extent_state *cached_state = NULL; 1612e9eec721SQu Wenruo struct defrag_target_range *entry; 1613e9eec721SQu Wenruo struct defrag_target_range *tmp; 1614e9eec721SQu Wenruo LIST_HEAD(target_list); 1615e9eec721SQu Wenruo struct page **pages; 1616e9eec721SQu Wenruo const u32 sectorsize = inode->root->fs_info->sectorsize; 1617e9eec721SQu Wenruo u64 last_index = (start + len - 1) >> PAGE_SHIFT; 1618e9eec721SQu Wenruo u64 start_index = start >> PAGE_SHIFT; 1619e9eec721SQu Wenruo unsigned int nr_pages = last_index - start_index + 1; 1620e9eec721SQu Wenruo int ret = 0; 1621e9eec721SQu Wenruo int i; 1622e9eec721SQu Wenruo 1623e9eec721SQu Wenruo ASSERT(nr_pages <= CLUSTER_SIZE / PAGE_SIZE); 1624e9eec721SQu Wenruo ASSERT(IS_ALIGNED(start, sectorsize) && IS_ALIGNED(len, sectorsize)); 1625e9eec721SQu Wenruo 1626e9eec721SQu Wenruo pages = kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS); 1627e9eec721SQu Wenruo if (!pages) 1628e9eec721SQu Wenruo return -ENOMEM; 1629e9eec721SQu Wenruo 1630e9eec721SQu Wenruo /* Prepare all pages */ 1631e9eec721SQu Wenruo for (i = 0; i < nr_pages; i++) { 1632e9eec721SQu Wenruo pages[i] = defrag_prepare_one_page(inode, start_index + i); 1633e9eec721SQu Wenruo if (IS_ERR(pages[i])) { 1634e9eec721SQu Wenruo ret = PTR_ERR(pages[i]); 1635e9eec721SQu Wenruo pages[i] = NULL; 1636e9eec721SQu Wenruo goto free_pages; 1637e9eec721SQu Wenruo } 1638e9eec721SQu Wenruo } 1639e9eec721SQu Wenruo for (i = 0; i < nr_pages; i++) 16404cb5300bSChris Mason wait_on_page_writeback(pages[i]); 16414cb5300bSChris Mason 1642e9eec721SQu Wenruo /* Lock the pages range */ 1643e9eec721SQu Wenruo lock_extent_bits(&inode->io_tree, start_index << PAGE_SHIFT, 1644e9eec721SQu Wenruo (last_index << PAGE_SHIFT) + PAGE_SIZE - 1, 1645e9eec721SQu Wenruo &cached_state); 1646e9eec721SQu Wenruo /* 1647e9eec721SQu Wenruo * Now we have a consistent view about the extent map, re-check 1648e9eec721SQu Wenruo * which range really needs to be defragged. 1649e9eec721SQu Wenruo * 1650e9eec721SQu Wenruo * And this time we have extent locked already, pass @locked = true 1651e9eec721SQu Wenruo * so that we won't relock the extent range and cause deadlock. 1652e9eec721SQu Wenruo */ 1653e9eec721SQu Wenruo ret = defrag_collect_targets(inode, start, len, extent_thresh, 1654e9eec721SQu Wenruo newer_than, do_compress, true, 1655966d879bSQu Wenruo &target_list, last_scanned_ret); 1656e9eec721SQu Wenruo if (ret < 0) 1657e9eec721SQu Wenruo goto unlock_extent; 16584cb5300bSChris Mason 1659e9eec721SQu Wenruo list_for_each_entry(entry, &target_list, list) { 1660e9eec721SQu Wenruo ret = defrag_one_locked_target(inode, entry, pages, nr_pages, 1661e9eec721SQu Wenruo &cached_state); 1662e9eec721SQu Wenruo if (ret < 0) 1663e9eec721SQu Wenruo break; 1664e9eec721SQu Wenruo } 1665e9eec721SQu Wenruo 1666e9eec721SQu Wenruo list_for_each_entry_safe(entry, tmp, &target_list, list) { 1667e9eec721SQu Wenruo list_del_init(&entry->list); 1668e9eec721SQu Wenruo kfree(entry); 1669e9eec721SQu Wenruo } 1670e9eec721SQu Wenruo unlock_extent: 1671e9eec721SQu Wenruo unlock_extent_cached(&inode->io_tree, start_index << PAGE_SHIFT, 1672e9eec721SQu Wenruo (last_index << PAGE_SHIFT) + PAGE_SIZE - 1, 1673e9eec721SQu Wenruo &cached_state); 1674e9eec721SQu Wenruo free_pages: 1675e9eec721SQu Wenruo for (i = 0; i < nr_pages; i++) { 1676e9eec721SQu Wenruo if (pages[i]) { 1677e9eec721SQu Wenruo unlock_page(pages[i]); 1678e9eec721SQu Wenruo put_page(pages[i]); 1679e9eec721SQu Wenruo } 1680e9eec721SQu Wenruo } 1681e9eec721SQu Wenruo kfree(pages); 1682e9eec721SQu Wenruo return ret; 1683e9eec721SQu Wenruo } 1684e9eec721SQu Wenruo 1685b18c3ab2SQu Wenruo static int defrag_one_cluster(struct btrfs_inode *inode, 1686b18c3ab2SQu Wenruo struct file_ra_state *ra, 1687b18c3ab2SQu Wenruo u64 start, u32 len, u32 extent_thresh, 1688b18c3ab2SQu Wenruo u64 newer_than, bool do_compress, 1689b18c3ab2SQu Wenruo unsigned long *sectors_defragged, 1690966d879bSQu Wenruo unsigned long max_sectors, 1691966d879bSQu Wenruo u64 *last_scanned_ret) 1692b18c3ab2SQu Wenruo { 1693b18c3ab2SQu Wenruo const u32 sectorsize = inode->root->fs_info->sectorsize; 1694b18c3ab2SQu Wenruo struct defrag_target_range *entry; 1695b18c3ab2SQu Wenruo struct defrag_target_range *tmp; 1696b18c3ab2SQu Wenruo LIST_HEAD(target_list); 1697b18c3ab2SQu Wenruo int ret; 1698b18c3ab2SQu Wenruo 1699b18c3ab2SQu Wenruo ret = defrag_collect_targets(inode, start, len, extent_thresh, 1700b18c3ab2SQu Wenruo newer_than, do_compress, false, 1701966d879bSQu Wenruo &target_list, NULL); 1702b18c3ab2SQu Wenruo if (ret < 0) 1703b18c3ab2SQu Wenruo goto out; 1704b18c3ab2SQu Wenruo 1705b18c3ab2SQu Wenruo list_for_each_entry(entry, &target_list, list) { 1706b18c3ab2SQu Wenruo u32 range_len = entry->len; 1707b18c3ab2SQu Wenruo 1708484167daSQu Wenruo /* Reached or beyond the limit */ 1709c080b414SQu Wenruo if (max_sectors && *sectors_defragged >= max_sectors) { 1710c080b414SQu Wenruo ret = 1; 1711b18c3ab2SQu Wenruo break; 1712c080b414SQu Wenruo } 1713b18c3ab2SQu Wenruo 1714b18c3ab2SQu Wenruo if (max_sectors) 1715b18c3ab2SQu Wenruo range_len = min_t(u32, range_len, 1716b18c3ab2SQu Wenruo (max_sectors - *sectors_defragged) * sectorsize); 1717b18c3ab2SQu Wenruo 1718966d879bSQu Wenruo /* 1719966d879bSQu Wenruo * If defrag_one_range() has updated last_scanned_ret, 1720966d879bSQu Wenruo * our range may already be invalid (e.g. hole punched). 1721966d879bSQu Wenruo * Skip if our range is before last_scanned_ret, as there is 1722966d879bSQu Wenruo * no need to defrag the range anymore. 1723966d879bSQu Wenruo */ 1724966d879bSQu Wenruo if (entry->start + range_len <= *last_scanned_ret) 1725966d879bSQu Wenruo continue; 1726966d879bSQu Wenruo 1727b18c3ab2SQu Wenruo if (ra) 1728b18c3ab2SQu Wenruo page_cache_sync_readahead(inode->vfs_inode.i_mapping, 1729b18c3ab2SQu Wenruo ra, NULL, entry->start >> PAGE_SHIFT, 1730b18c3ab2SQu Wenruo ((entry->start + range_len - 1) >> PAGE_SHIFT) - 1731b18c3ab2SQu Wenruo (entry->start >> PAGE_SHIFT) + 1); 1732b18c3ab2SQu Wenruo /* 1733b18c3ab2SQu Wenruo * Here we may not defrag any range if holes are punched before 1734b18c3ab2SQu Wenruo * we locked the pages. 1735b18c3ab2SQu Wenruo * But that's fine, it only affects the @sectors_defragged 1736b18c3ab2SQu Wenruo * accounting. 1737b18c3ab2SQu Wenruo */ 1738b18c3ab2SQu Wenruo ret = defrag_one_range(inode, entry->start, range_len, 1739966d879bSQu Wenruo extent_thresh, newer_than, do_compress, 1740966d879bSQu Wenruo last_scanned_ret); 1741b18c3ab2SQu Wenruo if (ret < 0) 1742b18c3ab2SQu Wenruo break; 1743484167daSQu Wenruo *sectors_defragged += range_len >> 1744484167daSQu Wenruo inode->root->fs_info->sectorsize_bits; 1745b18c3ab2SQu Wenruo } 1746b18c3ab2SQu Wenruo out: 1747b18c3ab2SQu Wenruo list_for_each_entry_safe(entry, tmp, &target_list, list) { 1748b18c3ab2SQu Wenruo list_del_init(&entry->list); 1749b18c3ab2SQu Wenruo kfree(entry); 1750b18c3ab2SQu Wenruo } 1751966d879bSQu Wenruo if (ret >= 0) 1752966d879bSQu Wenruo *last_scanned_ret = max(*last_scanned_ret, start + len); 1753b18c3ab2SQu Wenruo return ret; 1754b18c3ab2SQu Wenruo } 17557f458a38SFilipe Manana 17567f458a38SFilipe Manana /* 17571ccc2e8aSQu Wenruo * Entry point to file defragmentation. 17581ccc2e8aSQu Wenruo * 17591ccc2e8aSQu Wenruo * @inode: inode to be defragged 17601ccc2e8aSQu Wenruo * @ra: readahead state (can be NUL) 17611ccc2e8aSQu Wenruo * @range: defrag options including range and flags 17621ccc2e8aSQu Wenruo * @newer_than: minimum transid to defrag 17631ccc2e8aSQu Wenruo * @max_to_defrag: max number of sectors to be defragged, if 0, the whole inode 17641ccc2e8aSQu Wenruo * will be defragged. 1765484167daSQu Wenruo * 1766484167daSQu Wenruo * Return <0 for error. 1767c080b414SQu Wenruo * Return >=0 for the number of sectors defragged, and range->start will be updated 1768c080b414SQu Wenruo * to indicate the file offset where next defrag should be started at. 1769c080b414SQu Wenruo * (Mostly for autodefrag, which sets @max_to_defrag thus we may exit early without 1770c080b414SQu Wenruo * defragging all the range). 17717f458a38SFilipe Manana */ 17721ccc2e8aSQu Wenruo int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra, 17734cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 17744cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 17754cb5300bSChris Mason { 17760b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 17777b508037SQu Wenruo unsigned long sectors_defragged = 0; 1778151a31b2SLi Zefan u64 isize = i_size_read(inode); 17797b508037SQu Wenruo u64 cur; 17807b508037SQu Wenruo u64 last_byte; 17811e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 17821ccc2e8aSQu Wenruo bool ra_allocated = false; 17837b508037SQu Wenruo int compress_type = BTRFS_COMPRESS_ZLIB; 17847b508037SQu Wenruo int ret = 0; 17857b508037SQu Wenruo u32 extent_thresh = range->extent_thresh; 178627cdfde1SFilipe Manana pgoff_t start_index; 17874cb5300bSChris Mason 17880abd5b17SLiu Bo if (isize == 0) 17890abd5b17SLiu Bo return 0; 17900abd5b17SLiu Bo 17910abd5b17SLiu Bo if (range->start >= isize) 17920abd5b17SLiu Bo return -EINVAL; 17931a419d85SLi Zefan 17941e2ef46dSDavid Sterba if (do_compress) { 1795ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 17961a419d85SLi Zefan return -EINVAL; 17971a419d85SLi Zefan if (range->compress_type) 17981a419d85SLi Zefan compress_type = range->compress_type; 17991a419d85SLi Zefan } 1800f46b5a66SChristoph Hellwig 18010abd5b17SLiu Bo if (extent_thresh == 0) 1802ee22184bSByongho Lee extent_thresh = SZ_256K; 1803f46b5a66SChristoph Hellwig 18047b508037SQu Wenruo if (range->start + range->len > range->start) { 18057b508037SQu Wenruo /* Got a specific range */ 18066b34cd8eSFilipe Manana last_byte = min(isize, range->start + range->len); 18077b508037SQu Wenruo } else { 18087b508037SQu Wenruo /* Defrag until file end */ 18096b34cd8eSFilipe Manana last_byte = isize; 18107b508037SQu Wenruo } 18117b508037SQu Wenruo 18126b34cd8eSFilipe Manana /* Align the range */ 18136b34cd8eSFilipe Manana cur = round_down(range->start, fs_info->sectorsize); 18146b34cd8eSFilipe Manana last_byte = round_up(last_byte, fs_info->sectorsize) - 1; 18156b34cd8eSFilipe Manana 18164cb5300bSChris Mason /* 18171ccc2e8aSQu Wenruo * If we were not given a ra, allocate a readahead context. As 18180a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 18190a52d108SDavid Sterba * we don't error out. 18204cb5300bSChris Mason */ 18211ccc2e8aSQu Wenruo if (!ra) { 18221ccc2e8aSQu Wenruo ra_allocated = true; 182363e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 18240a52d108SDavid Sterba if (ra) 18254cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 18264cb5300bSChris Mason } 18274cb5300bSChris Mason 182827cdfde1SFilipe Manana /* 182927cdfde1SFilipe Manana * Make writeback start from the beginning of the range, so that the 183027cdfde1SFilipe Manana * defrag range can be written sequentially. 183127cdfde1SFilipe Manana */ 183227cdfde1SFilipe Manana start_index = cur >> PAGE_SHIFT; 183327cdfde1SFilipe Manana if (start_index < inode->i_mapping->writeback_index) 183427cdfde1SFilipe Manana inode->i_mapping->writeback_index = start_index; 183527cdfde1SFilipe Manana 18367b508037SQu Wenruo while (cur < last_byte) { 18373c9d31c7SFilipe Manana const unsigned long prev_sectors_defragged = sectors_defragged; 1838966d879bSQu Wenruo u64 last_scanned = cur; 18397b508037SQu Wenruo u64 cluster_end; 18401e701a32SChris Mason 1841b767c2fcSFilipe Manana if (btrfs_defrag_cancelled(fs_info)) { 1842b767c2fcSFilipe Manana ret = -EAGAIN; 1843b767c2fcSFilipe Manana break; 1844b767c2fcSFilipe Manana } 1845b767c2fcSFilipe Manana 18467b508037SQu Wenruo /* We want the cluster end at page boundary when possible */ 18477b508037SQu Wenruo cluster_end = (((cur >> PAGE_SHIFT) + 18487b508037SQu Wenruo (SZ_256K >> PAGE_SHIFT)) << PAGE_SHIFT) - 1; 18497b508037SQu Wenruo cluster_end = min(cluster_end, last_byte); 18504cb5300bSChris Mason 185164708539SJosef Bacik btrfs_inode_lock(inode, 0); 1852eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1853eede2bf3SOmar Sandoval ret = -ETXTBSY; 18547b508037SQu Wenruo btrfs_inode_unlock(inode, 0); 18557b508037SQu Wenruo break; 18567b508037SQu Wenruo } 18577b508037SQu Wenruo if (!(inode->i_sb->s_flags & SB_ACTIVE)) { 18587b508037SQu Wenruo btrfs_inode_unlock(inode, 0); 18597b508037SQu Wenruo break; 18607b508037SQu Wenruo } 18611e2ef46dSDavid Sterba if (do_compress) 1862eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 18637b508037SQu Wenruo ret = defrag_one_cluster(BTRFS_I(inode), ra, cur, 18647b508037SQu Wenruo cluster_end + 1 - cur, extent_thresh, 1865966d879bSQu Wenruo newer_than, do_compress, §ors_defragged, 1866966d879bSQu Wenruo max_to_defrag, &last_scanned); 18673c9d31c7SFilipe Manana 18683c9d31c7SFilipe Manana if (sectors_defragged > prev_sectors_defragged) 18693c9d31c7SFilipe Manana balance_dirty_pages_ratelimited(inode->i_mapping); 18703c9d31c7SFilipe Manana 187164708539SJosef Bacik btrfs_inode_unlock(inode, 0); 18727b508037SQu Wenruo if (ret < 0) 18734cb5300bSChris Mason break; 1874966d879bSQu Wenruo cur = max(cluster_end + 1, last_scanned); 1875c080b414SQu Wenruo if (ret > 0) { 1876c080b414SQu Wenruo ret = 0; 1877c080b414SQu Wenruo break; 1878c080b414SQu Wenruo } 1879ea0eba69SQu Wenruo cond_resched(); 18804cb5300bSChris Mason } 1881f46b5a66SChristoph Hellwig 18827b508037SQu Wenruo if (ra_allocated) 18837b508037SQu Wenruo kfree(ra); 1884c080b414SQu Wenruo /* 1885c080b414SQu Wenruo * Update range.start for autodefrag, this will indicate where to start 1886c080b414SQu Wenruo * in next run. 1887c080b414SQu Wenruo */ 1888c080b414SQu Wenruo range->start = cur; 18897b508037SQu Wenruo if (sectors_defragged) { 18907b508037SQu Wenruo /* 18917b508037SQu Wenruo * We have defragged some sectors, for compression case they 18927b508037SQu Wenruo * need to be written back immediately. 18937b508037SQu Wenruo */ 18947b508037SQu Wenruo if (range->flags & BTRFS_DEFRAG_RANGE_START_IO) { 18951e701a32SChris Mason filemap_flush(inode->i_mapping); 1896dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1897dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1898dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1899dec8ef90SFilipe Manana } 19007b508037SQu Wenruo if (range->compress_type == BTRFS_COMPRESS_LZO) 19010b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 19027b508037SQu Wenruo else if (range->compress_type == BTRFS_COMPRESS_ZSTD) 19035c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 19047b508037SQu Wenruo ret = sectors_defragged; 19051a419d85SLi Zefan } 19061e2ef46dSDavid Sterba if (do_compress) { 190764708539SJosef Bacik btrfs_inode_lock(inode, 0); 1908eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 190964708539SJosef Bacik btrfs_inode_unlock(inode, 0); 1910633085c7SFilipe David Borba Manana } 1911940100a4SChris Mason return ret; 1912f46b5a66SChristoph Hellwig } 1913f46b5a66SChristoph Hellwig 191417aaa434SDavid Sterba /* 191517aaa434SDavid Sterba * Try to start exclusive operation @type or cancel it if it's running. 191617aaa434SDavid Sterba * 191717aaa434SDavid Sterba * Return: 191817aaa434SDavid Sterba * 0 - normal mode, newly claimed op started 191917aaa434SDavid Sterba * >0 - normal mode, something else is running, 192017aaa434SDavid Sterba * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space 192117aaa434SDavid Sterba * ECANCELED - cancel mode, successful cancel 192217aaa434SDavid Sterba * ENOTCONN - cancel mode, operation not running anymore 192317aaa434SDavid Sterba */ 192417aaa434SDavid Sterba static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info, 192517aaa434SDavid Sterba enum btrfs_exclusive_operation type, bool cancel) 192617aaa434SDavid Sterba { 192717aaa434SDavid Sterba if (!cancel) { 192817aaa434SDavid Sterba /* Start normal op */ 192917aaa434SDavid Sterba if (!btrfs_exclop_start(fs_info, type)) 193017aaa434SDavid Sterba return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 193117aaa434SDavid Sterba /* Exclusive operation is now claimed */ 193217aaa434SDavid Sterba return 0; 193317aaa434SDavid Sterba } 193417aaa434SDavid Sterba 193517aaa434SDavid Sterba /* Cancel running op */ 193617aaa434SDavid Sterba if (btrfs_exclop_start_try_lock(fs_info, type)) { 193717aaa434SDavid Sterba /* 193817aaa434SDavid Sterba * This blocks any exclop finish from setting it to NONE, so we 193917aaa434SDavid Sterba * request cancellation. Either it runs and we will wait for it, 194017aaa434SDavid Sterba * or it has finished and no waiting will happen. 194117aaa434SDavid Sterba */ 194217aaa434SDavid Sterba atomic_inc(&fs_info->reloc_cancel_req); 194317aaa434SDavid Sterba btrfs_exclop_start_unlock(fs_info); 194417aaa434SDavid Sterba 194517aaa434SDavid Sterba if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags)) 194617aaa434SDavid Sterba wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING, 194717aaa434SDavid Sterba TASK_INTERRUPTIBLE); 194817aaa434SDavid Sterba 194917aaa434SDavid Sterba return -ECANCELED; 195017aaa434SDavid Sterba } 195117aaa434SDavid Sterba 195217aaa434SDavid Sterba /* Something else is running or none */ 195317aaa434SDavid Sterba return -ENOTCONN; 195417aaa434SDavid Sterba } 195517aaa434SDavid Sterba 1956198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 195776dda93cSYan, Zheng void __user *arg) 1958f46b5a66SChristoph Hellwig { 1959562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 19600b246afaSJeff Mahoney struct inode *inode = file_inode(file); 19610b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1962f46b5a66SChristoph Hellwig u64 new_size; 1963f46b5a66SChristoph Hellwig u64 old_size; 1964f46b5a66SChristoph Hellwig u64 devid = 1; 19650b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1966f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1967f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1968f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1969f46b5a66SChristoph Hellwig char *sizestr; 19709a40f122SGui Hecheng char *retptr; 1971f46b5a66SChristoph Hellwig char *devstr = NULL; 1972f46b5a66SChristoph Hellwig int ret = 0; 1973f46b5a66SChristoph Hellwig int mod = 0; 1974bb059a37SDavid Sterba bool cancel; 1975f46b5a66SChristoph Hellwig 1976e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1977e441d54dSChris Mason return -EPERM; 1978e441d54dSChris Mason 1979198605a8SMiao Xie ret = mnt_want_write_file(file); 1980198605a8SMiao Xie if (ret) 1981198605a8SMiao Xie return ret; 1982198605a8SMiao Xie 1983bb059a37SDavid Sterba /* 1984bb059a37SDavid Sterba * Read the arguments before checking exclusivity to be able to 1985bb059a37SDavid Sterba * distinguish regular resize and cancel 1986bb059a37SDavid Sterba */ 1987dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1988c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1989c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1990bb059a37SDavid Sterba goto out_drop; 1991c9e9f97bSIlya Dryomov } 19925516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1993f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1994bb059a37SDavid Sterba cancel = (strcmp("cancel", sizestr) == 0); 1995bb059a37SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel); 1996bb059a37SDavid Sterba if (ret) 1997bb059a37SDavid Sterba goto out_free; 1998bb059a37SDavid Sterba /* Exclusive operation is now claimed */ 1999bb059a37SDavid Sterba 2000f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 2001f46b5a66SChristoph Hellwig if (devstr) { 2002f46b5a66SChristoph Hellwig sizestr = devstr + 1; 2003f46b5a66SChristoph Hellwig *devstr = '\0'; 2004f46b5a66SChristoph Hellwig devstr = vol_args->name; 200558dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 200658dfae63SZhangZhen if (ret) 2007bb059a37SDavid Sterba goto out_finish; 2008dfd79829SMiao Xie if (!devid) { 2009dfd79829SMiao Xie ret = -EINVAL; 2010bb059a37SDavid Sterba goto out_finish; 2011dfd79829SMiao Xie } 20120b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 2013f46b5a66SChristoph Hellwig } 2014dba60f3fSMiao Xie 2015562d7b15SJosef Bacik args.devid = devid; 2016562d7b15SJosef Bacik device = btrfs_find_device(fs_info->fs_devices, &args); 2017f46b5a66SChristoph Hellwig if (!device) { 20180b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 2019c1c9ff7cSGeert Uytterhoeven devid); 2020dfd79829SMiao Xie ret = -ENODEV; 2021bb059a37SDavid Sterba goto out_finish; 2022f46b5a66SChristoph Hellwig } 2023dba60f3fSMiao Xie 2024ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 20250b246afaSJeff Mahoney btrfs_info(fs_info, 2026efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 2027c1c9ff7cSGeert Uytterhoeven devid); 2028dfd79829SMiao Xie ret = -EPERM; 2029bb059a37SDavid Sterba goto out_finish; 20304e42ae1bSLiu Bo } 20314e42ae1bSLiu Bo 2032f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 2033cda00ebaSChristoph Hellwig new_size = bdev_nr_bytes(device->bdev); 2034f46b5a66SChristoph Hellwig else { 2035f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 2036f46b5a66SChristoph Hellwig mod = -1; 2037f46b5a66SChristoph Hellwig sizestr++; 2038f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 2039f46b5a66SChristoph Hellwig mod = 1; 2040f46b5a66SChristoph Hellwig sizestr++; 2041f46b5a66SChristoph Hellwig } 20429a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 20439a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 2044f46b5a66SChristoph Hellwig ret = -EINVAL; 2045bb059a37SDavid Sterba goto out_finish; 2046f46b5a66SChristoph Hellwig } 2047f46b5a66SChristoph Hellwig } 2048f46b5a66SChristoph Hellwig 2049401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 2050dfd79829SMiao Xie ret = -EPERM; 2051bb059a37SDavid Sterba goto out_finish; 205263a212abSStefan Behrens } 205363a212abSStefan Behrens 20547cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 2055f46b5a66SChristoph Hellwig 2056f46b5a66SChristoph Hellwig if (mod < 0) { 2057f46b5a66SChristoph Hellwig if (new_size > old_size) { 2058f46b5a66SChristoph Hellwig ret = -EINVAL; 2059bb059a37SDavid Sterba goto out_finish; 2060f46b5a66SChristoph Hellwig } 2061f46b5a66SChristoph Hellwig new_size = old_size - new_size; 2062f46b5a66SChristoph Hellwig } else if (mod > 0) { 2063eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 2064902c68a4SGui Hecheng ret = -ERANGE; 2065bb059a37SDavid Sterba goto out_finish; 2066eb8052e0SWenliang Fan } 2067f46b5a66SChristoph Hellwig new_size = old_size + new_size; 2068f46b5a66SChristoph Hellwig } 2069f46b5a66SChristoph Hellwig 2070ee22184bSByongho Lee if (new_size < SZ_256M) { 2071f46b5a66SChristoph Hellwig ret = -EINVAL; 2072bb059a37SDavid Sterba goto out_finish; 2073f46b5a66SChristoph Hellwig } 2074cda00ebaSChristoph Hellwig if (new_size > bdev_nr_bytes(device->bdev)) { 2075f46b5a66SChristoph Hellwig ret = -EFBIG; 2076bb059a37SDavid Sterba goto out_finish; 2077f46b5a66SChristoph Hellwig } 2078f46b5a66SChristoph Hellwig 207947f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 2080f46b5a66SChristoph Hellwig 2081f46b5a66SChristoph Hellwig if (new_size > old_size) { 2082a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 208398d5dc13STsutomu Itoh if (IS_ERR(trans)) { 208498d5dc13STsutomu Itoh ret = PTR_ERR(trans); 2085bb059a37SDavid Sterba goto out_finish; 208698d5dc13STsutomu Itoh } 2087f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 20883a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 2089ece7d20eSMike Fleetwood } else if (new_size < old_size) { 2090f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 20910253f40eSjeff.liu } /* equal, nothing need to do */ 2092f46b5a66SChristoph Hellwig 2093faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 2094faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 2095faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 2096faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 2097faf8f7b9SMarcos Paulo de Souza old_size, new_size); 2098bb059a37SDavid Sterba out_finish: 2099bb059a37SDavid Sterba btrfs_exclop_finish(fs_info); 2100c9e9f97bSIlya Dryomov out_free: 2101f46b5a66SChristoph Hellwig kfree(vol_args); 2102bb059a37SDavid Sterba out_drop: 210318f39c41SIlya Dryomov mnt_drop_write_file(file); 2104f46b5a66SChristoph Hellwig return ret; 2105f46b5a66SChristoph Hellwig } 2106f46b5a66SChristoph Hellwig 21075d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 21084d4340c9SChristian Brauner struct user_namespace *mnt_userns, 210952f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 21105d54c67eSNikolay Borisov bool readonly, 21118696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 2112f46b5a66SChristoph Hellwig { 2113f46b5a66SChristoph Hellwig int namelen; 21143de4586cSChris Mason int ret = 0; 2115f46b5a66SChristoph Hellwig 2116325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 2117325c50e3SJeff Mahoney return -ENOTDIR; 2118325c50e3SJeff Mahoney 2119a874a63eSLiu Bo ret = mnt_want_write_file(file); 2120a874a63eSLiu Bo if (ret) 2121a874a63eSLiu Bo goto out; 2122a874a63eSLiu Bo 212372fd032eSSage Weil namelen = strlen(name); 212472fd032eSSage Weil if (strchr(name, '/')) { 2125f46b5a66SChristoph Hellwig ret = -EINVAL; 2126a874a63eSLiu Bo goto out_drop_write; 2127f46b5a66SChristoph Hellwig } 2128f46b5a66SChristoph Hellwig 212916780cabSChris Mason if (name[0] == '.' && 213016780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 213116780cabSChris Mason ret = -EEXIST; 2132a874a63eSLiu Bo goto out_drop_write; 213316780cabSChris Mason } 213416780cabSChris Mason 21353de4586cSChris Mason if (subvol) { 21364d4340c9SChristian Brauner ret = btrfs_mksubvol(&file->f_path, mnt_userns, name, 21374d4340c9SChristian Brauner namelen, NULL, readonly, inherit); 2138cb8e7090SChristoph Hellwig } else { 21392903ff01SAl Viro struct fd src = fdget(fd); 21403de4586cSChris Mason struct inode *src_inode; 21412903ff01SAl Viro if (!src.file) { 21423de4586cSChris Mason ret = -EINVAL; 2143a874a63eSLiu Bo goto out_drop_write; 21443de4586cSChris Mason } 21453de4586cSChris Mason 2146496ad9aaSAl Viro src_inode = file_inode(src.file); 2147496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 2148c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 2149efe120a0SFrank Holton "Snapshot src from another FS"); 215023ad5b17SKusanagi Kouichi ret = -EXDEV; 21514d4340c9SChristian Brauner } else if (!inode_owner_or_capable(mnt_userns, src_inode)) { 2152d0242061SDavid Sterba /* 2153d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 2154d0242061SDavid Sterba * are limited to own subvolumes only 2155d0242061SDavid Sterba */ 2156d0242061SDavid Sterba ret = -EPERM; 2157ecd18815SAl Viro } else { 21584d4340c9SChristian Brauner ret = btrfs_mksnapshot(&file->f_path, mnt_userns, 21594d4340c9SChristian Brauner name, namelen, 216072fd032eSSage Weil BTRFS_I(src_inode)->root, 21615d54c67eSNikolay Borisov readonly, inherit); 2162ecd18815SAl Viro } 21632903ff01SAl Viro fdput(src); 2164cb8e7090SChristoph Hellwig } 2165a874a63eSLiu Bo out_drop_write: 2166a874a63eSLiu Bo mnt_drop_write_file(file); 2167f46b5a66SChristoph Hellwig out: 216872fd032eSSage Weil return ret; 216972fd032eSSage Weil } 217072fd032eSSage Weil 217172fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 2172fa0d2b9bSLi Zefan void __user *arg, int subvol) 217372fd032eSSage Weil { 2174fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 217572fd032eSSage Weil int ret; 217672fd032eSSage Weil 2177325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 2178325c50e3SJeff Mahoney return -ENOTDIR; 2179325c50e3SJeff Mahoney 2180fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2181fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 2182fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 2183fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2184fa0d2b9bSLi Zefan 21854d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 21864d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 21874d4340c9SChristian Brauner false, NULL); 2188fa0d2b9bSLi Zefan 2189fa0d2b9bSLi Zefan kfree(vol_args); 2190fa0d2b9bSLi Zefan return ret; 2191fa0d2b9bSLi Zefan } 2192fa0d2b9bSLi Zefan 2193fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 2194fa0d2b9bSLi Zefan void __user *arg, int subvol) 2195fa0d2b9bSLi Zefan { 2196fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 2197fa0d2b9bSLi Zefan int ret; 2198b83cc969SLi Zefan bool readonly = false; 21996f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 220072fd032eSSage Weil 2201325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 2202325c50e3SJeff Mahoney return -ENOTDIR; 2203325c50e3SJeff Mahoney 2204fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2205fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 2206fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 2207fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 2208fdfb1e4fSLi Zefan 2209673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 2210b83cc969SLi Zefan ret = -EOPNOTSUPP; 2211c47ca32dSDan Carpenter goto free_args; 2212fdfb1e4fSLi Zefan } 2213fdfb1e4fSLi Zefan 2214b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 2215b83cc969SLi Zefan readonly = true; 22166f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 22175011c5a6SDan Carpenter u64 nums; 22185011c5a6SDan Carpenter 22195011c5a6SDan Carpenter if (vol_args->size < sizeof(*inherit) || 22205011c5a6SDan Carpenter vol_args->size > PAGE_SIZE) { 22216f72c7e2SArne Jansen ret = -EINVAL; 2222c47ca32dSDan Carpenter goto free_args; 22236f72c7e2SArne Jansen } 22246f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 22256f72c7e2SArne Jansen if (IS_ERR(inherit)) { 22266f72c7e2SArne Jansen ret = PTR_ERR(inherit); 2227c47ca32dSDan Carpenter goto free_args; 22286f72c7e2SArne Jansen } 22295011c5a6SDan Carpenter 22305011c5a6SDan Carpenter if (inherit->num_qgroups > PAGE_SIZE || 22315011c5a6SDan Carpenter inherit->num_ref_copies > PAGE_SIZE || 22325011c5a6SDan Carpenter inherit->num_excl_copies > PAGE_SIZE) { 22335011c5a6SDan Carpenter ret = -EINVAL; 22345011c5a6SDan Carpenter goto free_inherit; 22355011c5a6SDan Carpenter } 22365011c5a6SDan Carpenter 22375011c5a6SDan Carpenter nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + 22385011c5a6SDan Carpenter 2 * inherit->num_excl_copies; 22395011c5a6SDan Carpenter if (vol_args->size != struct_size(inherit, qgroups, nums)) { 22405011c5a6SDan Carpenter ret = -EINVAL; 22415011c5a6SDan Carpenter goto free_inherit; 22425011c5a6SDan Carpenter } 22436f72c7e2SArne Jansen } 224475eaa0e2SSage Weil 22454d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 22464d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 22474d4340c9SChristian Brauner readonly, inherit); 2248c47ca32dSDan Carpenter if (ret) 2249c47ca32dSDan Carpenter goto free_inherit; 2250c47ca32dSDan Carpenter free_inherit: 22516f72c7e2SArne Jansen kfree(inherit); 2252c47ca32dSDan Carpenter free_args: 2253c47ca32dSDan Carpenter kfree(vol_args); 2254f46b5a66SChristoph Hellwig return ret; 2255f46b5a66SChristoph Hellwig } 2256f46b5a66SChristoph Hellwig 22579ad12305SSahil Kang static noinline int btrfs_ioctl_subvol_getflags(struct inode *inode, 22580caa102dSLi Zefan void __user *arg) 22590caa102dSLi Zefan { 22600b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 22610caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 22620caa102dSLi Zefan int ret = 0; 22630caa102dSLi Zefan u64 flags = 0; 22640caa102dSLi Zefan 22654a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 22660caa102dSLi Zefan return -EINVAL; 22670caa102dSLi Zefan 22680b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 22690caa102dSLi Zefan if (btrfs_root_readonly(root)) 22700caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 22710b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 22720caa102dSLi Zefan 22730caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 22740caa102dSLi Zefan ret = -EFAULT; 22750caa102dSLi Zefan 22760caa102dSLi Zefan return ret; 22770caa102dSLi Zefan } 22780caa102dSLi Zefan 22790caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 22800caa102dSLi Zefan void __user *arg) 22810caa102dSLi Zefan { 2282496ad9aaSAl Viro struct inode *inode = file_inode(file); 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 struct btrfs_trans_handle *trans; 22860caa102dSLi Zefan u64 root_flags; 22870caa102dSLi Zefan u64 flags; 22880caa102dSLi Zefan int ret = 0; 22890caa102dSLi Zefan 229039e1674fSChristian Brauner if (!inode_owner_or_capable(file_mnt_user_ns(file), inode)) 2291bd60ea0fSDavid Sterba return -EPERM; 2292bd60ea0fSDavid Sterba 2293b9ca0664SLiu Bo ret = mnt_want_write_file(file); 2294b9ca0664SLiu Bo if (ret) 2295b9ca0664SLiu Bo goto out; 22960caa102dSLi Zefan 22974a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 2298b9ca0664SLiu Bo ret = -EINVAL; 2299b9ca0664SLiu Bo goto out_drop_write; 2300b9ca0664SLiu Bo } 23010caa102dSLi Zefan 2302b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 2303b9ca0664SLiu Bo ret = -EFAULT; 2304b9ca0664SLiu Bo goto out_drop_write; 2305b9ca0664SLiu Bo } 23060caa102dSLi Zefan 2307b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 2308b9ca0664SLiu Bo ret = -EOPNOTSUPP; 2309b9ca0664SLiu Bo goto out_drop_write; 2310b9ca0664SLiu Bo } 23110caa102dSLi Zefan 23120b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 23130caa102dSLi Zefan 23140caa102dSLi Zefan /* nothing to do */ 23150caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 2316b9ca0664SLiu Bo goto out_drop_sem; 23170caa102dSLi Zefan 23180caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 23192c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 23200caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 23210caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 23222c686537SDavid Sterba } else { 23232c686537SDavid Sterba /* 23242c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 23252c686537SDavid Sterba * send 23262c686537SDavid Sterba */ 23272c686537SDavid Sterba spin_lock(&root->root_item_lock); 23282c686537SDavid Sterba if (root->send_in_progress == 0) { 23290caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 23300caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 23312c686537SDavid Sterba spin_unlock(&root->root_item_lock); 23322c686537SDavid Sterba } else { 23332c686537SDavid Sterba spin_unlock(&root->root_item_lock); 23340b246afaSJeff Mahoney btrfs_warn(fs_info, 23352c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 23362c686537SDavid Sterba root->root_key.objectid); 23372c686537SDavid Sterba ret = -EPERM; 23382c686537SDavid Sterba goto out_drop_sem; 23392c686537SDavid Sterba } 23402c686537SDavid Sterba } 23410caa102dSLi Zefan 23420caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 23430caa102dSLi Zefan if (IS_ERR(trans)) { 23440caa102dSLi Zefan ret = PTR_ERR(trans); 23450caa102dSLi Zefan goto out_reset; 23460caa102dSLi Zefan } 23470caa102dSLi Zefan 23480b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 23490caa102dSLi Zefan &root->root_key, &root->root_item); 23509417ebc8SNikolay Borisov if (ret < 0) { 23519417ebc8SNikolay Borisov btrfs_end_transaction(trans); 23529417ebc8SNikolay Borisov goto out_reset; 23539417ebc8SNikolay Borisov } 23540caa102dSLi Zefan 23559417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 23569417ebc8SNikolay Borisov 23570caa102dSLi Zefan out_reset: 23580caa102dSLi Zefan if (ret) 23590caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 2360b9ca0664SLiu Bo out_drop_sem: 23610b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 2362b9ca0664SLiu Bo out_drop_write: 2363b9ca0664SLiu Bo mnt_drop_write_file(file); 2364b9ca0664SLiu Bo out: 23650caa102dSLi Zefan return ret; 23660caa102dSLi Zefan } 23670caa102dSLi Zefan 2368ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 2369ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 2370ac8e9819SChris Mason { 2371abc6e134SChris Mason struct btrfs_key test; 2372abc6e134SChris Mason int ret; 2373abc6e134SChris Mason 2374abc6e134SChris Mason test.objectid = sk->min_objectid; 2375abc6e134SChris Mason test.type = sk->min_type; 2376abc6e134SChris Mason test.offset = sk->min_offset; 2377abc6e134SChris Mason 2378abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2379abc6e134SChris Mason if (ret < 0) 2380ac8e9819SChris Mason return 0; 2381abc6e134SChris Mason 2382abc6e134SChris Mason test.objectid = sk->max_objectid; 2383abc6e134SChris Mason test.type = sk->max_type; 2384abc6e134SChris Mason test.offset = sk->max_offset; 2385abc6e134SChris Mason 2386abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2387abc6e134SChris Mason if (ret > 0) 2388ac8e9819SChris Mason return 0; 2389ac8e9819SChris Mason return 1; 2390ac8e9819SChris Mason } 2391ac8e9819SChris Mason 2392df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2393ac8e9819SChris Mason struct btrfs_key *key, 2394ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 23959b6e817dSGerhard Heift size_t *buf_size, 2396ba346b35SGerhard Heift char __user *ubuf, 2397ac8e9819SChris Mason unsigned long *sk_offset, 2398ac8e9819SChris Mason int *num_found) 2399ac8e9819SChris Mason { 2400ac8e9819SChris Mason u64 found_transid; 2401ac8e9819SChris Mason struct extent_buffer *leaf; 2402ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2403dd81d459SNaohiro Aota struct btrfs_key test; 2404ac8e9819SChris Mason unsigned long item_off; 2405ac8e9819SChris Mason unsigned long item_len; 2406ac8e9819SChris Mason int nritems; 2407ac8e9819SChris Mason int i; 2408ac8e9819SChris Mason int slot; 2409ac8e9819SChris Mason int ret = 0; 2410ac8e9819SChris Mason 2411ac8e9819SChris Mason leaf = path->nodes[0]; 2412ac8e9819SChris Mason slot = path->slots[0]; 2413ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2414ac8e9819SChris Mason 2415ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2416ac8e9819SChris Mason i = nritems; 2417ac8e9819SChris Mason goto advance_key; 2418ac8e9819SChris Mason } 2419ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2420ac8e9819SChris Mason 2421ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2422ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 24233212fa14SJosef Bacik item_len = btrfs_item_size(leaf, i); 2424ac8e9819SChris Mason 242503b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 242603b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 242703b71c6cSGabriel de Perthuis continue; 242803b71c6cSGabriel de Perthuis 24299b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 24308f5f6178SGerhard Heift if (*num_found) { 2431ac8e9819SChris Mason ret = 1; 24328f5f6178SGerhard Heift goto out; 24338f5f6178SGerhard Heift } 24348f5f6178SGerhard Heift 24358f5f6178SGerhard Heift /* 24368f5f6178SGerhard Heift * return one empty item back for v1, which does not 24378f5f6178SGerhard Heift * handle -EOVERFLOW 24388f5f6178SGerhard Heift */ 24398f5f6178SGerhard Heift 24409b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2441ac8e9819SChris Mason item_len = 0; 24428f5f6178SGerhard Heift ret = -EOVERFLOW; 24438f5f6178SGerhard Heift } 2444ac8e9819SChris Mason 24459b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2446ac8e9819SChris Mason ret = 1; 244725c9bc2eSGerhard Heift goto out; 2448ac8e9819SChris Mason } 2449ac8e9819SChris Mason 2450ac8e9819SChris Mason sh.objectid = key->objectid; 2451ac8e9819SChris Mason sh.offset = key->offset; 2452ac8e9819SChris Mason sh.type = key->type; 2453ac8e9819SChris Mason sh.len = item_len; 2454ac8e9819SChris Mason sh.transid = found_transid; 2455ac8e9819SChris Mason 2456a48b73ecSJosef Bacik /* 2457a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 2458a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 2459a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 2460a48b73ecSJosef Bacik * properly this next time through 2461a48b73ecSJosef Bacik */ 2462a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 2463a48b73ecSJosef Bacik ret = 0; 2464ba346b35SGerhard Heift goto out; 2465ba346b35SGerhard Heift } 2466ba346b35SGerhard Heift 2467ac8e9819SChris Mason *sk_offset += sizeof(sh); 2468ac8e9819SChris Mason 2469ac8e9819SChris Mason if (item_len) { 2470ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2471a48b73ecSJosef Bacik /* 2472a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 2473a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 2474a48b73ecSJosef Bacik */ 2475a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 2476ba346b35SGerhard Heift item_off, item_len)) { 2477a48b73ecSJosef Bacik ret = 0; 2478a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 2479ba346b35SGerhard Heift goto out; 2480ba346b35SGerhard Heift } 2481ba346b35SGerhard Heift 2482ac8e9819SChris Mason *sk_offset += item_len; 2483ac8e9819SChris Mason } 2484e2156867SHugo Mills (*num_found)++; 2485ac8e9819SChris Mason 24868f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 24878f5f6178SGerhard Heift goto out; 24888f5f6178SGerhard Heift 248925c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 249025c9bc2eSGerhard Heift ret = 1; 249125c9bc2eSGerhard Heift goto out; 249225c9bc2eSGerhard Heift } 2493ac8e9819SChris Mason } 2494ac8e9819SChris Mason advance_key: 2495ac8e9819SChris Mason ret = 0; 2496dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2497dd81d459SNaohiro Aota test.type = sk->max_type; 2498dd81d459SNaohiro Aota test.offset = sk->max_offset; 2499dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2500dd81d459SNaohiro Aota ret = 1; 2501dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2502abc6e134SChris Mason key->offset++; 2503dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2504abc6e134SChris Mason key->offset = 0; 2505abc6e134SChris Mason key->type++; 2506dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2507abc6e134SChris Mason key->offset = 0; 2508abc6e134SChris Mason key->type = 0; 2509abc6e134SChris Mason key->objectid++; 2510abc6e134SChris Mason } else 2511abc6e134SChris Mason ret = 1; 251225c9bc2eSGerhard Heift out: 2513ba346b35SGerhard Heift /* 2514ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2515ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2516ba346b35SGerhard Heift * * all items were found 2517ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2518ba346b35SGerhard Heift * leaf 2519ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2520ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2521ba346b35SGerhard Heift */ 2522ac8e9819SChris Mason return ret; 2523ac8e9819SChris Mason } 2524ac8e9819SChris Mason 2525ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 252612544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 25279b6e817dSGerhard Heift size_t *buf_size, 2528ba346b35SGerhard Heift char __user *ubuf) 2529ac8e9819SChris Mason { 25300b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2531ac8e9819SChris Mason struct btrfs_root *root; 2532ac8e9819SChris Mason struct btrfs_key key; 2533ac8e9819SChris Mason struct btrfs_path *path; 2534ac8e9819SChris Mason int ret; 2535ac8e9819SChris Mason int num_found = 0; 2536ac8e9819SChris Mason unsigned long sk_offset = 0; 2537ac8e9819SChris Mason 25389b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 25399b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 254012544442SGerhard Heift return -EOVERFLOW; 25419b6e817dSGerhard Heift } 254212544442SGerhard Heift 2543ac8e9819SChris Mason path = btrfs_alloc_path(); 2544ac8e9819SChris Mason if (!path) 2545ac8e9819SChris Mason return -ENOMEM; 2546ac8e9819SChris Mason 2547ac8e9819SChris Mason if (sk->tree_id == 0) { 2548ac8e9819SChris Mason /* search the root of the inode that was passed */ 254900246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2550ac8e9819SChris Mason } else { 255156e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2552ac8e9819SChris Mason if (IS_ERR(root)) { 2553ac8e9819SChris Mason btrfs_free_path(path); 2554ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2555ac8e9819SChris Mason } 2556ac8e9819SChris Mason } 2557ac8e9819SChris Mason 2558ac8e9819SChris Mason key.objectid = sk->min_objectid; 2559ac8e9819SChris Mason key.type = sk->min_type; 2560ac8e9819SChris Mason key.offset = sk->min_offset; 2561ac8e9819SChris Mason 2562ac8e9819SChris Mason while (1) { 2563bb523b40SAndreas Gruenbacher ret = -EFAULT; 2564bb523b40SAndreas Gruenbacher if (fault_in_writeable(ubuf + sk_offset, *buf_size - sk_offset)) 2565a48b73ecSJosef Bacik break; 2566a48b73ecSJosef Bacik 25676174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2568ac8e9819SChris Mason if (ret != 0) { 2569ac8e9819SChris Mason if (ret > 0) 2570ac8e9819SChris Mason ret = 0; 2571ac8e9819SChris Mason goto err; 2572ac8e9819SChris Mason } 2573df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2574ac8e9819SChris Mason &sk_offset, &num_found); 2575b3b4aa74SDavid Sterba btrfs_release_path(path); 257625c9bc2eSGerhard Heift if (ret) 2577ac8e9819SChris Mason break; 2578ac8e9819SChris Mason 2579ac8e9819SChris Mason } 25808f5f6178SGerhard Heift if (ret > 0) 2581ac8e9819SChris Mason ret = 0; 2582ac8e9819SChris Mason err: 2583ac8e9819SChris Mason sk->nr_items = num_found; 258400246528SJosef Bacik btrfs_put_root(root); 2585ac8e9819SChris Mason btrfs_free_path(path); 2586ac8e9819SChris Mason return ret; 2587ac8e9819SChris Mason } 2588ac8e9819SChris Mason 25899ad12305SSahil Kang static noinline int btrfs_ioctl_tree_search(struct inode *inode, 2590ac8e9819SChris Mason void __user *argp) 2591ac8e9819SChris Mason { 2592ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2593ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2594ac8e9819SChris Mason int ret; 25959b6e817dSGerhard Heift size_t buf_size; 2596ac8e9819SChris Mason 2597ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2598ac8e9819SChris Mason return -EPERM; 2599ac8e9819SChris Mason 2600ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2601ac8e9819SChris Mason 2602ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2603ba346b35SGerhard Heift return -EFAULT; 2604ba346b35SGerhard Heift 2605ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2606ac8e9819SChris Mason 2607ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 26088f5f6178SGerhard Heift 26098f5f6178SGerhard Heift /* 26108f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 26118f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 26128f5f6178SGerhard Heift */ 26138f5f6178SGerhard Heift if (ret == -EOVERFLOW) 26148f5f6178SGerhard Heift ret = 0; 26158f5f6178SGerhard Heift 2616ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2617ac8e9819SChris Mason ret = -EFAULT; 2618ac8e9819SChris Mason return ret; 2619ac8e9819SChris Mason } 2620ac8e9819SChris Mason 26219ad12305SSahil Kang static noinline int btrfs_ioctl_tree_search_v2(struct inode *inode, 2622cc68a8a5SGerhard Heift void __user *argp) 2623cc68a8a5SGerhard Heift { 2624cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2625cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2626cc68a8a5SGerhard Heift int ret; 2627cc68a8a5SGerhard Heift size_t buf_size; 2628ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2629cc68a8a5SGerhard Heift 2630cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2631cc68a8a5SGerhard Heift return -EPERM; 2632cc68a8a5SGerhard Heift 2633cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2634cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2635cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2636cc68a8a5SGerhard Heift return -EFAULT; 2637cc68a8a5SGerhard Heift 2638cc68a8a5SGerhard Heift buf_size = args.buf_size; 2639cc68a8a5SGerhard Heift 2640cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2641cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2642cc68a8a5SGerhard Heift buf_size = buf_limit; 2643cc68a8a5SGerhard Heift 2644cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2645718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2646cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2647cc68a8a5SGerhard Heift ret = -EFAULT; 2648cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2649cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2650cc68a8a5SGerhard Heift ret = -EFAULT; 2651cc68a8a5SGerhard Heift 265276dda93cSYan, Zheng return ret; 265376dda93cSYan, Zheng } 265476dda93cSYan, Zheng 265598d377a0STARUISI Hiroaki /* 2656ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2657ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 265898d377a0STARUISI Hiroaki */ 265998d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 266098d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 266198d377a0STARUISI Hiroaki { 266298d377a0STARUISI Hiroaki struct btrfs_root *root; 266398d377a0STARUISI Hiroaki struct btrfs_key key; 2664ac8e9819SChris Mason char *ptr; 266598d377a0STARUISI Hiroaki int ret = -1; 266698d377a0STARUISI Hiroaki int slot; 266798d377a0STARUISI Hiroaki int len; 266898d377a0STARUISI Hiroaki int total_len = 0; 266998d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 267098d377a0STARUISI Hiroaki struct extent_buffer *l; 267198d377a0STARUISI Hiroaki struct btrfs_path *path; 267298d377a0STARUISI Hiroaki 267398d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 267498d377a0STARUISI Hiroaki name[0]='\0'; 267598d377a0STARUISI Hiroaki return 0; 267698d377a0STARUISI Hiroaki } 267798d377a0STARUISI Hiroaki 267898d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 267998d377a0STARUISI Hiroaki if (!path) 268098d377a0STARUISI Hiroaki return -ENOMEM; 268198d377a0STARUISI Hiroaki 2682c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 268398d377a0STARUISI Hiroaki 268456e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 268598d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2686ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 268788234012SJosef Bacik root = NULL; 268888234012SJosef Bacik goto out; 268988234012SJosef Bacik } 269098d377a0STARUISI Hiroaki 269198d377a0STARUISI Hiroaki key.objectid = dirid; 269298d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 26938ad6fcabSChris Mason key.offset = (u64)-1; 269498d377a0STARUISI Hiroaki 269598d377a0STARUISI Hiroaki while (1) { 26960ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 269718674c6cSFilipe David Borba Manana if (ret < 0) 269818674c6cSFilipe David Borba Manana goto out; 269918674c6cSFilipe David Borba Manana else if (ret > 0) { 2700ac8e9819SChris Mason ret = -ENOENT; 270198d377a0STARUISI Hiroaki goto out; 2702ac8e9819SChris Mason } 270318674c6cSFilipe David Borba Manana 270418674c6cSFilipe David Borba Manana l = path->nodes[0]; 270518674c6cSFilipe David Borba Manana slot = path->slots[0]; 270698d377a0STARUISI Hiroaki 270798d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 270898d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 270998d377a0STARUISI Hiroaki ptr -= len + 1; 271098d377a0STARUISI Hiroaki total_len += len + 1; 2711a696cf35SFilipe David Borba Manana if (ptr < name) { 2712a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 271398d377a0STARUISI Hiroaki goto out; 2714a696cf35SFilipe David Borba Manana } 271598d377a0STARUISI Hiroaki 271698d377a0STARUISI Hiroaki *(ptr + len) = '/'; 271798d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 271898d377a0STARUISI Hiroaki 271998d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 272098d377a0STARUISI Hiroaki break; 272198d377a0STARUISI Hiroaki 2722b3b4aa74SDavid Sterba btrfs_release_path(path); 272398d377a0STARUISI Hiroaki key.objectid = key.offset; 27248ad6fcabSChris Mason key.offset = (u64)-1; 272598d377a0STARUISI Hiroaki dirid = key.objectid; 272698d377a0STARUISI Hiroaki } 272777906a50SLi Zefan memmove(name, ptr, total_len); 272898d377a0STARUISI Hiroaki name[total_len] = '\0'; 272998d377a0STARUISI Hiroaki ret = 0; 273098d377a0STARUISI Hiroaki out: 273100246528SJosef Bacik btrfs_put_root(root); 273298d377a0STARUISI Hiroaki btrfs_free_path(path); 2733ac8e9819SChris Mason return ret; 2734ac8e9819SChris Mason } 2735ac8e9819SChris Mason 27366623d9a0SChristian Brauner static int btrfs_search_path_in_tree_user(struct user_namespace *mnt_userns, 27376623d9a0SChristian Brauner struct inode *inode, 273823d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 273923d0b79dSTomohiro Misono { 274023d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 274123d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 274223d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 274323d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 274423d0b79dSTomohiro Misono u64 dirid = args->dirid; 274523d0b79dSTomohiro Misono unsigned long item_off; 274623d0b79dSTomohiro Misono unsigned long item_len; 274723d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 274823d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2749b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 275023d0b79dSTomohiro Misono struct btrfs_path *path; 275123d0b79dSTomohiro Misono struct btrfs_key key, key2; 275223d0b79dSTomohiro Misono struct extent_buffer *leaf; 275323d0b79dSTomohiro Misono struct inode *temp_inode; 275423d0b79dSTomohiro Misono char *ptr; 275523d0b79dSTomohiro Misono int slot; 275623d0b79dSTomohiro Misono int len; 275723d0b79dSTomohiro Misono int total_len = 0; 275823d0b79dSTomohiro Misono int ret; 275923d0b79dSTomohiro Misono 276023d0b79dSTomohiro Misono path = btrfs_alloc_path(); 276123d0b79dSTomohiro Misono if (!path) 276223d0b79dSTomohiro Misono return -ENOMEM; 276323d0b79dSTomohiro Misono 276423d0b79dSTomohiro Misono /* 276523d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 276623d0b79dSTomohiro Misono * construct the path in from the bottom up. 276723d0b79dSTomohiro Misono */ 276823d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 276923d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 277023d0b79dSTomohiro Misono 277156e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 277223d0b79dSTomohiro Misono if (IS_ERR(root)) { 277323d0b79dSTomohiro Misono ret = PTR_ERR(root); 277423d0b79dSTomohiro Misono goto out; 277523d0b79dSTomohiro Misono } 277623d0b79dSTomohiro Misono 277723d0b79dSTomohiro Misono key.objectid = dirid; 277823d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 277923d0b79dSTomohiro Misono key.offset = (u64)-1; 278023d0b79dSTomohiro Misono while (1) { 27810ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 27820ff40a91SMarcos Paulo de Souza if (ret < 0) 2783b8a49ae1SJosef Bacik goto out_put; 27840ff40a91SMarcos Paulo de Souza else if (ret > 0) { 278523d0b79dSTomohiro Misono ret = -ENOENT; 2786b8a49ae1SJosef Bacik goto out_put; 278723d0b79dSTomohiro Misono } 278823d0b79dSTomohiro Misono 278923d0b79dSTomohiro Misono leaf = path->nodes[0]; 279023d0b79dSTomohiro Misono slot = path->slots[0]; 279123d0b79dSTomohiro Misono 279223d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 279323d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 279423d0b79dSTomohiro Misono ptr -= len + 1; 279523d0b79dSTomohiro Misono total_len += len + 1; 279623d0b79dSTomohiro Misono if (ptr < args->path) { 279723d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2798b8a49ae1SJosef Bacik goto out_put; 279923d0b79dSTomohiro Misono } 280023d0b79dSTomohiro Misono 280123d0b79dSTomohiro Misono *(ptr + len) = '/'; 280223d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 280323d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 280423d0b79dSTomohiro Misono 280523d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 280623d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 280723d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 280823d0b79dSTomohiro Misono if (ret < 0) { 2809b8a49ae1SJosef Bacik goto out_put; 281023d0b79dSTomohiro Misono } else if (ret > 0) { 281123d0b79dSTomohiro Misono ret = -ENOENT; 2812b8a49ae1SJosef Bacik goto out_put; 281323d0b79dSTomohiro Misono } 281423d0b79dSTomohiro Misono 281523d0b79dSTomohiro Misono leaf = path->nodes[0]; 281623d0b79dSTomohiro Misono slot = path->slots[0]; 281723d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 281823d0b79dSTomohiro Misono if (key2.objectid != dirid) { 281923d0b79dSTomohiro Misono ret = -ENOENT; 2820b8a49ae1SJosef Bacik goto out_put; 282123d0b79dSTomohiro Misono } 282223d0b79dSTomohiro Misono 28230202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 28243ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 28253ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2826b8a49ae1SJosef Bacik goto out_put; 28273ca57bd6SMisono Tomohiro } 28286623d9a0SChristian Brauner ret = inode_permission(mnt_userns, temp_inode, 282947291baaSChristian Brauner MAY_READ | MAY_EXEC); 283023d0b79dSTomohiro Misono iput(temp_inode); 283123d0b79dSTomohiro Misono if (ret) { 283223d0b79dSTomohiro Misono ret = -EACCES; 2833b8a49ae1SJosef Bacik goto out_put; 283423d0b79dSTomohiro Misono } 283523d0b79dSTomohiro Misono 283623d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 283723d0b79dSTomohiro Misono break; 283823d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 283923d0b79dSTomohiro Misono ret = -EACCES; 2840b8a49ae1SJosef Bacik goto out_put; 284123d0b79dSTomohiro Misono } 284223d0b79dSTomohiro Misono 284323d0b79dSTomohiro Misono btrfs_release_path(path); 284423d0b79dSTomohiro Misono key.objectid = key.offset; 284523d0b79dSTomohiro Misono key.offset = (u64)-1; 284623d0b79dSTomohiro Misono dirid = key.objectid; 284723d0b79dSTomohiro Misono } 284823d0b79dSTomohiro Misono 284923d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 285023d0b79dSTomohiro Misono args->path[total_len] = '\0'; 285100246528SJosef Bacik btrfs_put_root(root); 2852b8a49ae1SJosef Bacik root = NULL; 285323d0b79dSTomohiro Misono btrfs_release_path(path); 285423d0b79dSTomohiro Misono } 285523d0b79dSTomohiro Misono 285623d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 285723d0b79dSTomohiro Misono key.objectid = treeid; 285823d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 285923d0b79dSTomohiro Misono key.offset = args->treeid; 2860b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 286123d0b79dSTomohiro Misono if (ret < 0) { 286223d0b79dSTomohiro Misono goto out; 286323d0b79dSTomohiro Misono } else if (ret > 0) { 286423d0b79dSTomohiro Misono ret = -ENOENT; 286523d0b79dSTomohiro Misono goto out; 286623d0b79dSTomohiro Misono } 286723d0b79dSTomohiro Misono 286823d0b79dSTomohiro Misono leaf = path->nodes[0]; 286923d0b79dSTomohiro Misono slot = path->slots[0]; 287023d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 287123d0b79dSTomohiro Misono 287223d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 28733212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot); 287423d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 287523d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 287623d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 287723d0b79dSTomohiro Misono ret = -EINVAL; 287823d0b79dSTomohiro Misono goto out; 287923d0b79dSTomohiro Misono } 288023d0b79dSTomohiro Misono 288123d0b79dSTomohiro Misono /* Copy subvolume's name */ 288223d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 288323d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 288423d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 288523d0b79dSTomohiro Misono args->name[item_len] = 0; 288623d0b79dSTomohiro Misono 2887b8a49ae1SJosef Bacik out_put: 288800246528SJosef Bacik btrfs_put_root(root); 288923d0b79dSTomohiro Misono out: 289023d0b79dSTomohiro Misono btrfs_free_path(path); 289123d0b79dSTomohiro Misono return ret; 289223d0b79dSTomohiro Misono } 289323d0b79dSTomohiro Misono 2894dc408ccdSSahil Kang static noinline int btrfs_ioctl_ino_lookup(struct btrfs_root *root, 2895ac8e9819SChris Mason void __user *argp) 2896ac8e9819SChris Mason { 2897ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 289801b810b8SDavid Sterba int ret = 0; 2899ac8e9819SChris Mason 29002354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 29012354d08fSJulia Lawall if (IS_ERR(args)) 29022354d08fSJulia Lawall return PTR_ERR(args); 2903c2b96929SDan Carpenter 290401b810b8SDavid Sterba /* 290501b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 290601b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 290701b810b8SDavid Sterba */ 29081b53ac4dSChris Mason if (args->treeid == 0) 2909dc408ccdSSahil Kang args->treeid = root->root_key.objectid; 29101b53ac4dSChris Mason 291101b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 291201b810b8SDavid Sterba args->name[0] = 0; 291301b810b8SDavid Sterba goto out; 291401b810b8SDavid Sterba } 291501b810b8SDavid Sterba 291601b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 291701b810b8SDavid Sterba ret = -EPERM; 291801b810b8SDavid Sterba goto out; 291901b810b8SDavid Sterba } 292001b810b8SDavid Sterba 2921dc408ccdSSahil Kang ret = btrfs_search_path_in_tree(root->fs_info, 2922ac8e9819SChris Mason args->treeid, args->objectid, 2923ac8e9819SChris Mason args->name); 2924ac8e9819SChris Mason 292501b810b8SDavid Sterba out: 2926ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2927ac8e9819SChris Mason ret = -EFAULT; 2928ac8e9819SChris Mason 2929ac8e9819SChris Mason kfree(args); 293098d377a0STARUISI Hiroaki return ret; 293198d377a0STARUISI Hiroaki } 293298d377a0STARUISI Hiroaki 293323d0b79dSTomohiro Misono /* 293423d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 293523d0b79dSTomohiro Misono * 293623d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 293723d0b79dSTomohiro Misono * 293823d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 293923d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 294023d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 294123d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 294223d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 294323d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 294423d0b79dSTomohiro Misono */ 294523d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 294623d0b79dSTomohiro Misono { 294723d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 294823d0b79dSTomohiro Misono struct inode *inode; 294923d0b79dSTomohiro Misono int ret; 295023d0b79dSTomohiro Misono 295123d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 295223d0b79dSTomohiro Misono if (IS_ERR(args)) 295323d0b79dSTomohiro Misono return PTR_ERR(args); 295423d0b79dSTomohiro Misono 295523d0b79dSTomohiro Misono inode = file_inode(file); 295623d0b79dSTomohiro Misono 295723d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 295823d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 295923d0b79dSTomohiro Misono /* 296023d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 296123d0b79dSTomohiro Misono * called 296223d0b79dSTomohiro Misono */ 296323d0b79dSTomohiro Misono kfree(args); 296423d0b79dSTomohiro Misono return -EACCES; 296523d0b79dSTomohiro Misono } 296623d0b79dSTomohiro Misono 29676623d9a0SChristian Brauner ret = btrfs_search_path_in_tree_user(file_mnt_user_ns(file), inode, args); 296823d0b79dSTomohiro Misono 296923d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 297023d0b79dSTomohiro Misono ret = -EFAULT; 297123d0b79dSTomohiro Misono 297223d0b79dSTomohiro Misono kfree(args); 297323d0b79dSTomohiro Misono return ret; 297423d0b79dSTomohiro Misono } 297523d0b79dSTomohiro Misono 2976b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 29779ad12305SSahil Kang static int btrfs_ioctl_get_subvol_info(struct inode *inode, void __user *argp) 2978b64ec075STomohiro Misono { 2979b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2980b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2981b64ec075STomohiro Misono struct btrfs_root *root; 2982b64ec075STomohiro Misono struct btrfs_path *path; 2983b64ec075STomohiro Misono struct btrfs_key key; 2984b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2985b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2986b64ec075STomohiro Misono struct extent_buffer *leaf; 2987b64ec075STomohiro Misono unsigned long item_off; 2988b64ec075STomohiro Misono unsigned long item_len; 2989b64ec075STomohiro Misono int slot; 2990b64ec075STomohiro Misono int ret = 0; 2991b64ec075STomohiro Misono 2992b64ec075STomohiro Misono path = btrfs_alloc_path(); 2993b64ec075STomohiro Misono if (!path) 2994b64ec075STomohiro Misono return -ENOMEM; 2995b64ec075STomohiro Misono 2996b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2997b64ec075STomohiro Misono if (!subvol_info) { 2998b64ec075STomohiro Misono btrfs_free_path(path); 2999b64ec075STomohiro Misono return -ENOMEM; 3000b64ec075STomohiro Misono } 3001b64ec075STomohiro Misono 3002b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 3003b64ec075STomohiro Misono 3004b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 3005b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 300656e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 3007b64ec075STomohiro Misono if (IS_ERR(root)) { 3008b64ec075STomohiro Misono ret = PTR_ERR(root); 300904734e84SJosef Bacik goto out_free; 301004734e84SJosef Bacik } 3011b64ec075STomohiro Misono root_item = &root->root_item; 3012b64ec075STomohiro Misono 3013b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 3014b64ec075STomohiro Misono 3015b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 3016b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 3017b64ec075STomohiro Misono 3018b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 3019b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 3020b64ec075STomohiro Misono BTRFS_UUID_SIZE); 3021b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 3022b64ec075STomohiro Misono BTRFS_UUID_SIZE); 3023b64ec075STomohiro Misono 3024b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 3025b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 3026b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 3027b64ec075STomohiro Misono 3028b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 3029b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 3030b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 3031b64ec075STomohiro Misono 3032b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 3033b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 3034b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 3035b64ec075STomohiro Misono 3036b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 3037b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 3038b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 3039b64ec075STomohiro Misono 3040b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 3041b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 3042b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 3043b64ec075STomohiro Misono key.offset = 0; 304404734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 3045b64ec075STomohiro Misono if (ret < 0) { 3046b64ec075STomohiro Misono goto out; 3047b64ec075STomohiro Misono } else if (path->slots[0] >= 3048b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 304904734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 3050b64ec075STomohiro Misono if (ret < 0) { 3051b64ec075STomohiro Misono goto out; 3052b64ec075STomohiro Misono } else if (ret > 0) { 3053b64ec075STomohiro Misono ret = -EUCLEAN; 3054b64ec075STomohiro Misono goto out; 3055b64ec075STomohiro Misono } 3056b64ec075STomohiro Misono } 3057b64ec075STomohiro Misono 3058b64ec075STomohiro Misono leaf = path->nodes[0]; 3059b64ec075STomohiro Misono slot = path->slots[0]; 3060b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 3061b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 3062b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 3063b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 3064b64ec075STomohiro Misono 3065b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 3066b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 3067b64ec075STomohiro Misono 3068b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 3069b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 30703212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot) 3071b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 3072b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 3073b64ec075STomohiro Misono item_off, item_len); 3074b64ec075STomohiro Misono } else { 3075b64ec075STomohiro Misono ret = -ENOENT; 3076b64ec075STomohiro Misono goto out; 3077b64ec075STomohiro Misono } 3078b64ec075STomohiro Misono } 3079b64ec075STomohiro Misono 3080b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 3081b64ec075STomohiro Misono ret = -EFAULT; 3082b64ec075STomohiro Misono 3083b64ec075STomohiro Misono out: 308400246528SJosef Bacik btrfs_put_root(root); 308504734e84SJosef Bacik out_free: 3086b64ec075STomohiro Misono btrfs_free_path(path); 3087b091f7feSWaiman Long kfree(subvol_info); 3088b64ec075STomohiro Misono return ret; 3089b64ec075STomohiro Misono } 3090b64ec075STomohiro Misono 309142e4b520STomohiro Misono /* 309242e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 309342e4b520STomohiro Misono * except the subvolume name. 309442e4b520STomohiro Misono */ 30959ad12305SSahil Kang static int btrfs_ioctl_get_subvol_rootref(struct btrfs_root *root, 3096dc408ccdSSahil Kang void __user *argp) 309742e4b520STomohiro Misono { 309842e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 309942e4b520STomohiro Misono struct btrfs_root_ref *rref; 310042e4b520STomohiro Misono struct btrfs_path *path; 310142e4b520STomohiro Misono struct btrfs_key key; 310242e4b520STomohiro Misono struct extent_buffer *leaf; 310342e4b520STomohiro Misono u64 objectid; 310442e4b520STomohiro Misono int slot; 310542e4b520STomohiro Misono int ret; 310642e4b520STomohiro Misono u8 found; 310742e4b520STomohiro Misono 310842e4b520STomohiro Misono path = btrfs_alloc_path(); 310942e4b520STomohiro Misono if (!path) 311042e4b520STomohiro Misono return -ENOMEM; 311142e4b520STomohiro Misono 311242e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 311342e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 311442e4b520STomohiro Misono btrfs_free_path(path); 311542e4b520STomohiro Misono return PTR_ERR(rootrefs); 311642e4b520STomohiro Misono } 311742e4b520STomohiro Misono 31189ad12305SSahil Kang objectid = root->root_key.objectid; 311942e4b520STomohiro Misono key.objectid = objectid; 312042e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 312142e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 312242e4b520STomohiro Misono found = 0; 312342e4b520STomohiro Misono 31249ad12305SSahil Kang root = root->fs_info->tree_root; 312542e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 312642e4b520STomohiro Misono if (ret < 0) { 312742e4b520STomohiro Misono goto out; 312842e4b520STomohiro Misono } else if (path->slots[0] >= 312942e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 313042e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 313142e4b520STomohiro Misono if (ret < 0) { 313242e4b520STomohiro Misono goto out; 313342e4b520STomohiro Misono } else if (ret > 0) { 313442e4b520STomohiro Misono ret = -EUCLEAN; 313542e4b520STomohiro Misono goto out; 313642e4b520STomohiro Misono } 313742e4b520STomohiro Misono } 313842e4b520STomohiro Misono while (1) { 313942e4b520STomohiro Misono leaf = path->nodes[0]; 314042e4b520STomohiro Misono slot = path->slots[0]; 314142e4b520STomohiro Misono 314242e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 314342e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 314442e4b520STomohiro Misono ret = 0; 314542e4b520STomohiro Misono goto out; 314642e4b520STomohiro Misono } 314742e4b520STomohiro Misono 314842e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 314942e4b520STomohiro Misono ret = -EOVERFLOW; 315042e4b520STomohiro Misono goto out; 315142e4b520STomohiro Misono } 315242e4b520STomohiro Misono 315342e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 315442e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 315542e4b520STomohiro Misono rootrefs->rootref[found].dirid = 315642e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 315742e4b520STomohiro Misono found++; 315842e4b520STomohiro Misono 315942e4b520STomohiro Misono ret = btrfs_next_item(root, path); 316042e4b520STomohiro Misono if (ret < 0) { 316142e4b520STomohiro Misono goto out; 316242e4b520STomohiro Misono } else if (ret > 0) { 316342e4b520STomohiro Misono ret = -EUCLEAN; 316442e4b520STomohiro Misono goto out; 316542e4b520STomohiro Misono } 316642e4b520STomohiro Misono } 316742e4b520STomohiro Misono 316842e4b520STomohiro Misono out: 316942e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 317042e4b520STomohiro Misono rootrefs->num_items = found; 317142e4b520STomohiro Misono /* update min_treeid for next search */ 317242e4b520STomohiro Misono if (found) 317342e4b520STomohiro Misono rootrefs->min_treeid = 317442e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 317542e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 317642e4b520STomohiro Misono ret = -EFAULT; 317742e4b520STomohiro Misono } 317842e4b520STomohiro Misono 317942e4b520STomohiro Misono kfree(rootrefs); 318042e4b520STomohiro Misono btrfs_free_path(path); 318142e4b520STomohiro Misono 318242e4b520STomohiro Misono return ret; 318342e4b520STomohiro Misono } 318442e4b520STomohiro Misono 318576dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 3186949964c9SMarcos Paulo de Souza void __user *arg, 3187949964c9SMarcos Paulo de Souza bool destroy_v2) 318876dda93cSYan, Zheng { 318954563d41SAl Viro struct dentry *parent = file->f_path.dentry; 31900b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 319176dda93cSYan, Zheng struct dentry *dentry; 31922b0143b5SDavid Howells struct inode *dir = d_inode(parent); 319376dda93cSYan, Zheng struct inode *inode; 319476dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 319576dda93cSYan, Zheng struct btrfs_root *dest = NULL; 3196949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 3197949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 3198c4ed533bSChristian Brauner struct user_namespace *mnt_userns = file_mnt_user_ns(file); 3199949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 3200949964c9SMarcos Paulo de Souza int subvol_namelen; 320176dda93cSYan, Zheng int err = 0; 3202949964c9SMarcos Paulo de Souza bool destroy_parent = false; 320376dda93cSYan, Zheng 3204813febdbSJosef Bacik /* We don't support snapshots with extent tree v2 yet. */ 3205813febdbSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 3206813febdbSJosef Bacik btrfs_err(fs_info, 3207813febdbSJosef Bacik "extent tree v2 doesn't support snapshot deletion yet"); 3208813febdbSJosef Bacik return -EOPNOTSUPP; 3209813febdbSJosef Bacik } 3210813febdbSJosef Bacik 3211949964c9SMarcos Paulo de Souza if (destroy_v2) { 3212949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 3213949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 3214949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 3215325c50e3SJeff Mahoney 3216949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 3217949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 3218949964c9SMarcos Paulo de Souza goto out; 3219949964c9SMarcos Paulo de Souza } 322076dda93cSYan, Zheng 3221949964c9SMarcos Paulo de Souza /* 3222949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 3223949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 3224949964c9SMarcos Paulo de Souza */ 3225949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 3226949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 3227949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 3228949964c9SMarcos Paulo de Souza 3229949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3230949964c9SMarcos Paulo de Souza if (err) 3231949964c9SMarcos Paulo de Souza goto out; 3232949964c9SMarcos Paulo de Souza } else { 3233aabb34e7SChristian Brauner struct inode *old_dir; 3234c4ed533bSChristian Brauner 3235949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 323676dda93cSYan, Zheng err = -EINVAL; 323776dda93cSYan, Zheng goto out; 323876dda93cSYan, Zheng } 323976dda93cSYan, Zheng 3240a561be71SAl Viro err = mnt_want_write_file(file); 324176dda93cSYan, Zheng if (err) 324276dda93cSYan, Zheng goto out; 324376dda93cSYan, Zheng 3244949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 3245949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 3246949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 3247949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 3248949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 3249949964c9SMarcos Paulo de Souza goto out_drop_write; 3250949964c9SMarcos Paulo de Souza } 3251949964c9SMarcos Paulo de Souza 3252949964c9SMarcos Paulo de Souza /* 3253949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 3254949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 3255949964c9SMarcos Paulo de Souza */ 3256949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 3257949964c9SMarcos Paulo de Souza 3258949964c9SMarcos Paulo de Souza /* 3259949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 3260949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 3261949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 3262949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 3263949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 3264949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 3265949964c9SMarcos Paulo de Souza */ 3266949964c9SMarcos Paulo de Souza dput(dentry); 3267949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 3268949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 3269949964c9SMarcos Paulo de Souza goto out_drop_write; 3270949964c9SMarcos Paulo de Souza } 3271aabb34e7SChristian Brauner old_dir = dir; 3272949964c9SMarcos Paulo de Souza dir = d_inode(parent); 3273949964c9SMarcos Paulo de Souza 3274949964c9SMarcos Paulo de Souza /* 3275949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 3276949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 3277949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 3278949964c9SMarcos Paulo de Souza * new parent dentry. 3279949964c9SMarcos Paulo de Souza */ 3280949964c9SMarcos Paulo de Souza destroy_parent = true; 3281949964c9SMarcos Paulo de Souza 3282aabb34e7SChristian Brauner /* 3283aabb34e7SChristian Brauner * On idmapped mounts, deletion via subvolid is 3284aabb34e7SChristian Brauner * restricted to subvolumes that are immediate 3285aabb34e7SChristian Brauner * ancestors of the inode referenced by the file 3286aabb34e7SChristian Brauner * descriptor in the ioctl. Otherwise the idmapping 3287aabb34e7SChristian Brauner * could potentially be abused to delete subvolumes 3288aabb34e7SChristian Brauner * anywhere in the filesystem the user wouldn't be able 3289aabb34e7SChristian Brauner * to delete without an idmapped mount. 3290aabb34e7SChristian Brauner */ 3291aabb34e7SChristian Brauner if (old_dir != dir && mnt_userns != &init_user_ns) { 3292aabb34e7SChristian Brauner err = -EOPNOTSUPP; 3293aabb34e7SChristian Brauner goto free_parent; 3294aabb34e7SChristian Brauner } 3295aabb34e7SChristian Brauner 3296949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 3297949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 3298949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 3299949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 3300949964c9SMarcos Paulo de Souza goto free_parent; 3301949964c9SMarcos Paulo de Souza } 33021a9fd417SDavid Sterba /* subvol_name_ptr is already nul terminated */ 3303949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 3304949964c9SMarcos Paulo de Souza } 3305949964c9SMarcos Paulo de Souza } else { 3306949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 3307949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 3308949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 3309949964c9SMarcos Paulo de Souza 3310949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 3311949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 3312949964c9SMarcos Paulo de Souza 3313949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3314949964c9SMarcos Paulo de Souza if (err) 3315949964c9SMarcos Paulo de Souza goto out; 3316949964c9SMarcos Paulo de Souza } 3317949964c9SMarcos Paulo de Souza 3318949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 3319949964c9SMarcos Paulo de Souza 3320949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 3321949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 3322949964c9SMarcos Paulo de Souza err = -EINVAL; 3323949964c9SMarcos Paulo de Souza goto free_subvol_name; 3324949964c9SMarcos Paulo de Souza } 3325949964c9SMarcos Paulo de Souza 3326949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 3327949964c9SMarcos Paulo de Souza err = -ENOTDIR; 3328949964c9SMarcos Paulo de Souza goto free_subvol_name; 3329949964c9SMarcos Paulo de Souza } 3330521e0546SDavid Sterba 333100235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 333200235411SAl Viro if (err == -EINTR) 3333949964c9SMarcos Paulo de Souza goto free_subvol_name; 3334c4ed533bSChristian Brauner dentry = lookup_one(mnt_userns, subvol_name, parent, subvol_namelen); 333576dda93cSYan, Zheng if (IS_ERR(dentry)) { 333676dda93cSYan, Zheng err = PTR_ERR(dentry); 333776dda93cSYan, Zheng goto out_unlock_dir; 333876dda93cSYan, Zheng } 333976dda93cSYan, Zheng 33402b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 334176dda93cSYan, Zheng err = -ENOENT; 334276dda93cSYan, Zheng goto out_dput; 334376dda93cSYan, Zheng } 334476dda93cSYan, Zheng 33452b0143b5SDavid Howells inode = d_inode(dentry); 33464260f7c7SSage Weil dest = BTRFS_I(inode)->root; 33474260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 33484260f7c7SSage Weil /* 33494260f7c7SSage Weil * Regular user. Only allow this with a special mount 33504260f7c7SSage Weil * option, when the user has write+exec access to the 33514260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 33524260f7c7SSage Weil * allowed. 33534260f7c7SSage Weil * 33544260f7c7SSage Weil * Note that this is _not_ check that the subvol is 33554260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 33564260f7c7SSage Weil * otherwise be able to delete. 33574260f7c7SSage Weil * 33584260f7c7SSage Weil * Users who want to delete empty subvols should try 33594260f7c7SSage Weil * rmdir(2). 33604260f7c7SSage Weil */ 33614260f7c7SSage Weil err = -EPERM; 33620b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 33634260f7c7SSage Weil goto out_dput; 33644260f7c7SSage Weil 33654260f7c7SSage Weil /* 33664260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 33674260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 33684260f7c7SSage Weil * must be called on the dentry referencing the root 33694260f7c7SSage Weil * of the subvol, not a random directory contained 33704260f7c7SSage Weil * within it. 33714260f7c7SSage Weil */ 33724260f7c7SSage Weil err = -EINVAL; 33734260f7c7SSage Weil if (root == dest) 33744260f7c7SSage Weil goto out_dput; 33754260f7c7SSage Weil 3376c4ed533bSChristian Brauner err = inode_permission(mnt_userns, inode, MAY_WRITE | MAY_EXEC); 33774260f7c7SSage Weil if (err) 33784260f7c7SSage Weil goto out_dput; 33795c39da5bSMiao Xie } 33804260f7c7SSage Weil 33815c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 3382c4ed533bSChristian Brauner err = btrfs_may_delete(mnt_userns, dir, dentry, 1); 33834260f7c7SSage Weil if (err) 33844260f7c7SSage Weil goto out_dput; 33854260f7c7SSage Weil 33864a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 338776dda93cSYan, Zheng err = -EINVAL; 338876dda93cSYan, Zheng goto out_dput; 338976dda93cSYan, Zheng } 339076dda93cSYan, Zheng 339164708539SJosef Bacik btrfs_inode_lock(inode, 0); 3392f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 339364708539SJosef Bacik btrfs_inode_unlock(inode, 0); 3394a37d9a17SAmir Goldstein if (!err) 3395a37d9a17SAmir Goldstein d_delete_notify(dir, dentry); 3396fa6ac876SLiu Bo 339776dda93cSYan, Zheng out_dput: 339876dda93cSYan, Zheng dput(dentry); 339976dda93cSYan, Zheng out_unlock_dir: 340064708539SJosef Bacik btrfs_inode_unlock(dir, 0); 3401949964c9SMarcos Paulo de Souza free_subvol_name: 3402949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3403949964c9SMarcos Paulo de Souza free_parent: 3404949964c9SMarcos Paulo de Souza if (destroy_parent) 3405949964c9SMarcos Paulo de Souza dput(parent); 340600235411SAl Viro out_drop_write: 34072a79f17eSAl Viro mnt_drop_write_file(file); 340876dda93cSYan, Zheng out: 3409949964c9SMarcos Paulo de Souza kfree(vol_args2); 341076dda93cSYan, Zheng kfree(vol_args); 341176dda93cSYan, Zheng return err; 341276dda93cSYan, Zheng } 341376dda93cSYan, Zheng 34141e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3415f46b5a66SChristoph Hellwig { 3416496ad9aaSAl Viro struct inode *inode = file_inode(file); 3417f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3418c853a578SGoldwyn Rodrigues struct btrfs_ioctl_defrag_range_args range = {0}; 3419c146afadSYan Zheng int ret; 3420c146afadSYan Zheng 342125122d15SIlya Dryomov ret = mnt_want_write_file(file); 342225122d15SIlya Dryomov if (ret) 342325122d15SIlya Dryomov return ret; 3424b83cc969SLi Zefan 342525122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 342625122d15SIlya Dryomov ret = -EROFS; 342725122d15SIlya Dryomov goto out; 34285ac00addSStefan Behrens } 3429f46b5a66SChristoph Hellwig 3430f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3431f46b5a66SChristoph Hellwig case S_IFDIR: 3432e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3433e441d54dSChris Mason ret = -EPERM; 3434e441d54dSChris Mason goto out; 3435e441d54dSChris Mason } 3436de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3437f46b5a66SChristoph Hellwig break; 3438f46b5a66SChristoph Hellwig case S_IFREG: 3439616d374eSAdam Borowski /* 3440616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3441616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3442616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3443616d374eSAdam Borowski */ 3444616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 344547291baaSChristian Brauner inode_permission(&init_user_ns, inode, MAY_WRITE)) { 3446616d374eSAdam Borowski ret = -EPERM; 3447e441d54dSChris Mason goto out; 3448e441d54dSChris Mason } 34491e701a32SChris Mason 34501e701a32SChris Mason if (argp) { 3451c853a578SGoldwyn Rodrigues if (copy_from_user(&range, argp, sizeof(range))) { 34521e701a32SChris Mason ret = -EFAULT; 3453683be16eSDan Carpenter goto out; 34541e701a32SChris Mason } 34551e701a32SChris Mason /* compression requires us to start the IO */ 3456c853a578SGoldwyn Rodrigues if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 3457c853a578SGoldwyn Rodrigues range.flags |= BTRFS_DEFRAG_RANGE_START_IO; 3458c853a578SGoldwyn Rodrigues range.extent_thresh = (u32)-1; 34591e701a32SChris Mason } 34601e701a32SChris Mason } else { 34611e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 3462c853a578SGoldwyn Rodrigues range.len = (u64)-1; 34631e701a32SChris Mason } 34641ccc2e8aSQu Wenruo ret = btrfs_defrag_file(file_inode(file), &file->f_ra, 3465c853a578SGoldwyn Rodrigues &range, BTRFS_OLDEST_GENERATION, 0); 34664cb5300bSChris Mason if (ret > 0) 34674cb5300bSChris Mason ret = 0; 3468f46b5a66SChristoph Hellwig break; 34698929ecfaSYan, Zheng default: 34708929ecfaSYan, Zheng ret = -EINVAL; 3471f46b5a66SChristoph Hellwig } 3472e441d54dSChris Mason out: 347325122d15SIlya Dryomov mnt_drop_write_file(file); 3474e441d54dSChris Mason return ret; 3475f46b5a66SChristoph Hellwig } 3476f46b5a66SChristoph Hellwig 34772ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3478f46b5a66SChristoph Hellwig { 3479f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3480a174c0a2SNikolay Borisov bool restore_op = false; 3481f46b5a66SChristoph Hellwig int ret; 3482f46b5a66SChristoph Hellwig 3483e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3484e441d54dSChris Mason return -EPERM; 3485e441d54dSChris Mason 3486914a519bSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 3487914a519bSJosef Bacik btrfs_err(fs_info, "device add not supported on extent tree v2 yet"); 3488914a519bSJosef Bacik return -EINVAL; 3489914a519bSJosef Bacik } 3490914a519bSJosef Bacik 3491a174c0a2SNikolay Borisov if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) { 3492a174c0a2SNikolay Borisov if (!btrfs_exclop_start_try_lock(fs_info, BTRFS_EXCLOP_DEV_ADD)) 3493e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3494c9e9f97bSIlya Dryomov 3495a174c0a2SNikolay Borisov /* 3496a174c0a2SNikolay Borisov * We can do the device add because we have a paused balanced, 3497a174c0a2SNikolay Borisov * change the exclusive op type and remember we should bring 3498a174c0a2SNikolay Borisov * back the paused balance 3499a174c0a2SNikolay Borisov */ 3500a174c0a2SNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_DEV_ADD; 3501a174c0a2SNikolay Borisov btrfs_exclop_start_unlock(fs_info); 3502a174c0a2SNikolay Borisov restore_op = true; 3503a174c0a2SNikolay Borisov } 3504a174c0a2SNikolay Borisov 3505dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3506c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3507c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3508c9e9f97bSIlya Dryomov goto out; 3509c9e9f97bSIlya Dryomov } 3510f46b5a66SChristoph Hellwig 35115516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 35122ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3513f46b5a66SChristoph Hellwig 351443d20761SAnand Jain if (!ret) 35150b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 351643d20761SAnand Jain 3517f46b5a66SChristoph Hellwig kfree(vol_args); 3518c9e9f97bSIlya Dryomov out: 3519a174c0a2SNikolay Borisov if (restore_op) 3520a174c0a2SNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED); 3521a174c0a2SNikolay Borisov else 3522c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3523f46b5a66SChristoph Hellwig return ret; 3524f46b5a66SChristoph Hellwig } 3525f46b5a66SChristoph Hellwig 35266b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3527f46b5a66SChristoph Hellwig { 35281a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 35290b246afaSJeff Mahoney struct inode *inode = file_inode(file); 35300b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 35316b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 35323fa421deSJosef Bacik struct block_device *bdev = NULL; 35333fa421deSJosef Bacik fmode_t mode; 3534f46b5a66SChristoph Hellwig int ret; 353567ae34b6SDavid Sterba bool cancel = false; 3536f46b5a66SChristoph Hellwig 3537e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3538e441d54dSChris Mason return -EPERM; 3539e441d54dSChris Mason 3540dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3541d815b3f2SDan Carpenter if (IS_ERR(vol_args)) 3542d815b3f2SDan Carpenter return PTR_ERR(vol_args); 3543f46b5a66SChristoph Hellwig 3544748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3545fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3546fd4e994bSOmar Sandoval goto out; 3547fd4e994bSOmar Sandoval } 35481a15eb72SJosef Bacik 35496b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 35501a15eb72SJosef Bacik if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 35511a15eb72SJosef Bacik args.devid = vol_args->devid; 35521a15eb72SJosef Bacik } else if (!strcmp("cancel", vol_args->name)) { 355367ae34b6SDavid Sterba cancel = true; 35541a15eb72SJosef Bacik } else { 35551a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 35561a15eb72SJosef Bacik if (ret) 35571a15eb72SJosef Bacik goto out; 35581a15eb72SJosef Bacik } 35591a15eb72SJosef Bacik 35601a15eb72SJosef Bacik ret = mnt_want_write_file(file); 35611a15eb72SJosef Bacik if (ret) 35621a15eb72SJosef Bacik goto out; 356367ae34b6SDavid Sterba 356467ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 356567ae34b6SDavid Sterba cancel); 356667ae34b6SDavid Sterba if (ret) 35671a15eb72SJosef Bacik goto err_drop; 356867ae34b6SDavid Sterba 35691a15eb72SJosef Bacik /* Exclusive operation is now claimed */ 35701a15eb72SJosef Bacik ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); 357167ae34b6SDavid Sterba 3572c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3573183860f6SAnand Jain 35746b526ed7SAnand Jain if (!ret) { 3575735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 35760b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 35776b526ed7SAnand Jain vol_args->devid); 35786b526ed7SAnand Jain else 35790b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 35806b526ed7SAnand Jain vol_args->name); 35816b526ed7SAnand Jain } 3582c47ca32dSDan Carpenter err_drop: 35834ac20c70SIlya Dryomov mnt_drop_write_file(file); 35843fa421deSJosef Bacik if (bdev) 35853fa421deSJosef Bacik blkdev_put(bdev, mode); 35861a15eb72SJosef Bacik out: 35871a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 35881a15eb72SJosef Bacik kfree(vol_args); 3589f46b5a66SChristoph Hellwig return ret; 3590f46b5a66SChristoph Hellwig } 3591f46b5a66SChristoph Hellwig 3592f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3593f46b5a66SChristoph Hellwig { 35941a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 35950b246afaSJeff Mahoney struct inode *inode = file_inode(file); 35960b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3597f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 35983fa421deSJosef Bacik struct block_device *bdev = NULL; 35993fa421deSJosef Bacik fmode_t mode; 3600f46b5a66SChristoph Hellwig int ret; 360137b45995STom Rix bool cancel = false; 3602f46b5a66SChristoph Hellwig 3603f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3604f46b5a66SChristoph Hellwig return -EPERM; 3605f46b5a66SChristoph Hellwig 36061a15eb72SJosef Bacik vol_args = memdup_user(arg, sizeof(*vol_args)); 36071a15eb72SJosef Bacik if (IS_ERR(vol_args)) 36081a15eb72SJosef Bacik return PTR_ERR(vol_args); 36091a15eb72SJosef Bacik 36101a15eb72SJosef Bacik vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 36111a15eb72SJosef Bacik if (!strcmp("cancel", vol_args->name)) { 36121a15eb72SJosef Bacik cancel = true; 36131a15eb72SJosef Bacik } else { 36141a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 36151a15eb72SJosef Bacik if (ret) 36161a15eb72SJosef Bacik goto out; 36171a15eb72SJosef Bacik } 36181a15eb72SJosef Bacik 3619f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3620f46b5a66SChristoph Hellwig if (ret) 36211a15eb72SJosef Bacik goto out; 3622f46b5a66SChristoph Hellwig 362367ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 362467ae34b6SDavid Sterba cancel); 362567ae34b6SDavid Sterba if (ret == 0) { 36261a15eb72SJosef Bacik ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); 3627f46b5a66SChristoph Hellwig if (!ret) 36280b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3629c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 363067ae34b6SDavid Sterba } 363167ae34b6SDavid Sterba 3632f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 36333fa421deSJosef Bacik if (bdev) 36343fa421deSJosef Bacik blkdev_put(bdev, mode); 36351a15eb72SJosef Bacik out: 36361a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 36371a15eb72SJosef Bacik kfree(vol_args); 3638f46b5a66SChristoph Hellwig return ret; 3639f46b5a66SChristoph Hellwig } 3640f46b5a66SChristoph Hellwig 36412ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 36422ff7e61eSJeff Mahoney void __user *arg) 3643475f6387SJan Schmidt { 3644027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3645475f6387SJan Schmidt struct btrfs_device *device; 36460b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3647137c5418SJohannes Thumshirn u64 flags_in; 3648027ed2f0SLi Zefan int ret = 0; 3649475f6387SJan Schmidt 3650137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3651137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3652137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3653137c5418SJohannes Thumshirn 3654137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3655137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3656027ed2f0SLi Zefan 3657d03262c7SDavid Sterba rcu_read_lock(); 3658027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3659475f6387SJan Schmidt 3660d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3661027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3662027ed2f0SLi Zefan fi_args->max_id = device->devid; 3663475f6387SJan Schmidt } 3664d03262c7SDavid Sterba rcu_read_unlock(); 3665475f6387SJan Schmidt 3666de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3667bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3668bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3669bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 367080a773fbSDavid Sterba 3671137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3672137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3673137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3674137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3675137c5418SJohannes Thumshirn } 3676137c5418SJohannes Thumshirn 36770fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 36780fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 36790fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 36800fb408a5SJohannes Thumshirn } 36810fb408a5SJohannes Thumshirn 368249bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 368349bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 368449bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 368549bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 368649bac897SJohannes Thumshirn } 368749bac897SJohannes Thumshirn 3688027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3689027ed2f0SLi Zefan ret = -EFAULT; 3690475f6387SJan Schmidt 3691027ed2f0SLi Zefan kfree(fi_args); 3692027ed2f0SLi Zefan return ret; 3693475f6387SJan Schmidt } 3694475f6387SJan Schmidt 36952ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 36962ff7e61eSJeff Mahoney void __user *arg) 3697475f6387SJan Schmidt { 3698562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 3699475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3700475f6387SJan Schmidt struct btrfs_device *dev; 3701475f6387SJan Schmidt int ret = 0; 3702475f6387SJan Schmidt 3703475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3704475f6387SJan Schmidt if (IS_ERR(di_args)) 3705475f6387SJan Schmidt return PTR_ERR(di_args); 3706475f6387SJan Schmidt 3707562d7b15SJosef Bacik args.devid = di_args->devid; 3708dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3709562d7b15SJosef Bacik args.uuid = di_args->uuid; 3710475f6387SJan Schmidt 3711c5593ca3SDavid Sterba rcu_read_lock(); 3712562d7b15SJosef Bacik dev = btrfs_find_device(fs_info->fs_devices, &args); 3713475f6387SJan Schmidt if (!dev) { 3714475f6387SJan Schmidt ret = -ENODEV; 3715475f6387SJan Schmidt goto out; 3716475f6387SJan Schmidt } 3717475f6387SJan Schmidt 3718475f6387SJan Schmidt di_args->devid = dev->devid; 37197cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 37207cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3721475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3722a27202fbSJim Meyering if (dev->name) { 3723672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3724672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3725a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3726a27202fbSJim Meyering } else { 372799ba55adSStefan Behrens di_args->path[0] = '\0'; 3728a27202fbSJim Meyering } 3729475f6387SJan Schmidt 3730475f6387SJan Schmidt out: 3731c5593ca3SDavid Sterba rcu_read_unlock(); 3732475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3733475f6387SJan Schmidt ret = -EFAULT; 3734475f6387SJan Schmidt 3735475f6387SJan Schmidt kfree(di_args); 3736475f6387SJan Schmidt return ret; 3737475f6387SJan Schmidt } 3738475f6387SJan Schmidt 37396ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 37406ef5ed0dSJosef Bacik { 3741496ad9aaSAl Viro struct inode *inode = file_inode(file); 37420b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 37436ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 37446ef5ed0dSJosef Bacik struct btrfs_root *new_root; 37456ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 37466ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 37472a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 37486ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 37496ef5ed0dSJosef Bacik u64 objectid = 0; 37506ef5ed0dSJosef Bacik u64 dir_id; 37513c04ce01SMiao Xie int ret; 37526ef5ed0dSJosef Bacik 37536ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 37546ef5ed0dSJosef Bacik return -EPERM; 37556ef5ed0dSJosef Bacik 37563c04ce01SMiao Xie ret = mnt_want_write_file(file); 37573c04ce01SMiao Xie if (ret) 37583c04ce01SMiao Xie return ret; 37593c04ce01SMiao Xie 37603c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 37613c04ce01SMiao Xie ret = -EFAULT; 37623c04ce01SMiao Xie goto out; 37633c04ce01SMiao Xie } 37646ef5ed0dSJosef Bacik 37656ef5ed0dSJosef Bacik if (!objectid) 37661cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 37676ef5ed0dSJosef Bacik 376856e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 37693c04ce01SMiao Xie if (IS_ERR(new_root)) { 37703c04ce01SMiao Xie ret = PTR_ERR(new_root); 37713c04ce01SMiao Xie goto out; 37723c04ce01SMiao Xie } 37732a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 37742a2b5d62SJosef Bacik ret = -ENOENT; 37752a2b5d62SJosef Bacik goto out_free; 37762a2b5d62SJosef Bacik } 37776ef5ed0dSJosef Bacik 37786ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 37793c04ce01SMiao Xie if (!path) { 37803c04ce01SMiao Xie ret = -ENOMEM; 37812a2b5d62SJosef Bacik goto out_free; 37823c04ce01SMiao Xie } 37836ef5ed0dSJosef Bacik 37846ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 378598d5dc13STsutomu Itoh if (IS_ERR(trans)) { 37863c04ce01SMiao Xie ret = PTR_ERR(trans); 37872a2b5d62SJosef Bacik goto out_free; 37886ef5ed0dSJosef Bacik } 37896ef5ed0dSJosef Bacik 37900b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 37910b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 37926ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3793cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 37942a2b5d62SJosef Bacik btrfs_release_path(path); 37953a45bb20SJeff Mahoney btrfs_end_transaction(trans); 37960b246afaSJeff Mahoney btrfs_err(fs_info, 37975d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 37983c04ce01SMiao Xie ret = -ENOENT; 37992a2b5d62SJosef Bacik goto out_free; 38006ef5ed0dSJosef Bacik } 38016ef5ed0dSJosef Bacik 38026ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 38036ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 38046ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 38052a2b5d62SJosef Bacik btrfs_release_path(path); 38066ef5ed0dSJosef Bacik 38070b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 38083a45bb20SJeff Mahoney btrfs_end_transaction(trans); 38092a2b5d62SJosef Bacik out_free: 381000246528SJosef Bacik btrfs_put_root(new_root); 38112a2b5d62SJosef Bacik btrfs_free_path(path); 38123c04ce01SMiao Xie out: 38133c04ce01SMiao Xie mnt_drop_write_file(file); 38143c04ce01SMiao Xie return ret; 38156ef5ed0dSJosef Bacik } 38166ef5ed0dSJosef Bacik 3817c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3818bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3819bf5fc093SJosef Bacik { 382032da5386SDavid Sterba struct btrfs_block_group *block_group; 3821bf5fc093SJosef Bacik 3822bf5fc093SJosef Bacik space->total_bytes = 0; 3823bf5fc093SJosef Bacik space->used_bytes = 0; 3824bf5fc093SJosef Bacik space->flags = 0; 3825bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3826bf5fc093SJosef Bacik space->flags = block_group->flags; 3827b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3828bf38be65SDavid Sterba space->used_bytes += block_group->used; 3829bf5fc093SJosef Bacik } 3830bf5fc093SJosef Bacik } 3831bf5fc093SJosef Bacik 38322ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 38332ff7e61eSJeff Mahoney void __user *arg) 38341406e432SJosef Bacik { 38351406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 38361406e432SJosef Bacik struct btrfs_ioctl_space_info space; 38371406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 38387fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 383913f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 38401406e432SJosef Bacik struct btrfs_space_info *info; 3841315d8e98SColin Ian King static const u64 types[] = { 3842315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3843bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3844bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3845315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3846315d8e98SColin Ian King }; 3847bf5fc093SJosef Bacik int num_types = 4; 38487fde62bfSChris Mason int alloc_size; 38491406e432SJosef Bacik int ret = 0; 385051788b1bSDan Rosenberg u64 slot_count = 0; 3851bf5fc093SJosef Bacik int i, c; 38521406e432SJosef Bacik 38531406e432SJosef Bacik if (copy_from_user(&space_args, 38541406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 38551406e432SJosef Bacik sizeof(space_args))) 38561406e432SJosef Bacik return -EFAULT; 38571406e432SJosef Bacik 3858bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3859bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3860bf5fc093SJosef Bacik 3861bf5fc093SJosef Bacik info = NULL; 386272804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3863bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3864bf5fc093SJosef Bacik info = tmp; 3865bf5fc093SJosef Bacik break; 3866bf5fc093SJosef Bacik } 3867bf5fc093SJosef Bacik } 38681406e432SJosef Bacik 3869bf5fc093SJosef Bacik if (!info) 3870bf5fc093SJosef Bacik continue; 3871bf5fc093SJosef Bacik 3872bf5fc093SJosef Bacik down_read(&info->groups_sem); 3873bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3874bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3875bf5fc093SJosef Bacik slot_count++; 3876bf5fc093SJosef Bacik } 3877bf5fc093SJosef Bacik up_read(&info->groups_sem); 3878bf5fc093SJosef Bacik } 3879bf5fc093SJosef Bacik 388036523e95SDavid Sterba /* 388136523e95SDavid Sterba * Global block reserve, exported as a space_info 388236523e95SDavid Sterba */ 388336523e95SDavid Sterba slot_count++; 388436523e95SDavid Sterba 38857fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 38867fde62bfSChris Mason if (space_args.space_slots == 0) { 38877fde62bfSChris Mason space_args.total_spaces = slot_count; 38887fde62bfSChris Mason goto out; 38897fde62bfSChris Mason } 3890bf5fc093SJosef Bacik 389151788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3892bf5fc093SJosef Bacik 38937fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3894bf5fc093SJosef Bacik 38957fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 38967fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 38977fde62bfSChris Mason */ 389809cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 38997fde62bfSChris Mason return -ENOMEM; 39007fde62bfSChris Mason 39017fde62bfSChris Mason space_args.total_spaces = 0; 39028d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 39037fde62bfSChris Mason if (!dest) 39047fde62bfSChris Mason return -ENOMEM; 39057fde62bfSChris Mason dest_orig = dest; 39067fde62bfSChris Mason 39077fde62bfSChris Mason /* now we have a buffer to copy into */ 3908bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3909bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3910bf5fc093SJosef Bacik 391151788b1bSDan Rosenberg if (!slot_count) 391251788b1bSDan Rosenberg break; 391351788b1bSDan Rosenberg 3914bf5fc093SJosef Bacik info = NULL; 391572804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3916bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3917bf5fc093SJosef Bacik info = tmp; 39187fde62bfSChris Mason break; 3919bf5fc093SJosef Bacik } 3920bf5fc093SJosef Bacik } 39217fde62bfSChris Mason 3922bf5fc093SJosef Bacik if (!info) 3923bf5fc093SJosef Bacik continue; 3924bf5fc093SJosef Bacik down_read(&info->groups_sem); 3925bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3926bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3927c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3928c065f5b1SSu Yue &space); 39297fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 39301406e432SJosef Bacik dest++; 39311406e432SJosef Bacik space_args.total_spaces++; 393251788b1bSDan Rosenberg slot_count--; 39331406e432SJosef Bacik } 393451788b1bSDan Rosenberg if (!slot_count) 393551788b1bSDan Rosenberg break; 3936bf5fc093SJosef Bacik } 3937bf5fc093SJosef Bacik up_read(&info->groups_sem); 3938bf5fc093SJosef Bacik } 39391406e432SJosef Bacik 394036523e95SDavid Sterba /* 394136523e95SDavid Sterba * Add global block reserve 394236523e95SDavid Sterba */ 394336523e95SDavid Sterba if (slot_count) { 39440b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 394536523e95SDavid Sterba 394636523e95SDavid Sterba spin_lock(&block_rsv->lock); 394736523e95SDavid Sterba space.total_bytes = block_rsv->size; 394836523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 394936523e95SDavid Sterba spin_unlock(&block_rsv->lock); 395036523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 395136523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 395236523e95SDavid Sterba space_args.total_spaces++; 395336523e95SDavid Sterba } 395436523e95SDavid Sterba 39552eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 39567fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 39577fde62bfSChris Mason 39587fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 39597fde62bfSChris Mason ret = -EFAULT; 39607fde62bfSChris Mason 39617fde62bfSChris Mason kfree(dest_orig); 39627fde62bfSChris Mason out: 39637fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 39641406e432SJosef Bacik ret = -EFAULT; 39651406e432SJosef Bacik 39661406e432SJosef Bacik return ret; 39671406e432SJosef Bacik } 39681406e432SJosef Bacik 39699a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 39709a8c28beSMiao Xie void __user *argp) 397146204592SSage Weil { 397246204592SSage Weil struct btrfs_trans_handle *trans; 397346204592SSage Weil u64 transid; 397446204592SSage Weil 3975d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3976ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3977ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 397898d5dc13STsutomu Itoh return PTR_ERR(trans); 3979ff7c1d33SMiao Xie 3980ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3981ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3982ff7c1d33SMiao Xie goto out; 3983ff7c1d33SMiao Xie } 398446204592SSage Weil transid = trans->transid; 3985fdfbf020SJosef Bacik btrfs_commit_transaction_async(trans); 3986ff7c1d33SMiao Xie out: 398746204592SSage Weil if (argp) 398846204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 398946204592SSage Weil return -EFAULT; 399046204592SSage Weil return 0; 399146204592SSage Weil } 399246204592SSage Weil 39932ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 39949a8c28beSMiao Xie void __user *argp) 399546204592SSage Weil { 399646204592SSage Weil u64 transid; 399746204592SSage Weil 399846204592SSage Weil if (argp) { 399946204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 400046204592SSage Weil return -EFAULT; 400146204592SSage Weil } else { 400246204592SSage Weil transid = 0; /* current trans */ 400346204592SSage Weil } 40042ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 400546204592SSage Weil } 400646204592SSage Weil 4007b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 4008475f6387SJan Schmidt { 40090b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 4010475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4011b8e95489SMiao Xie int ret; 4012475f6387SJan Schmidt 4013475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4014475f6387SJan Schmidt return -EPERM; 4015475f6387SJan Schmidt 4016da32c6d5SJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 4017da32c6d5SJosef Bacik btrfs_err(fs_info, "scrub is not supported on extent tree v2 yet"); 4018da32c6d5SJosef Bacik return -EINVAL; 4019da32c6d5SJosef Bacik } 4020da32c6d5SJosef Bacik 4021475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4022475f6387SJan Schmidt if (IS_ERR(sa)) 4023475f6387SJan Schmidt return PTR_ERR(sa); 4024475f6387SJan Schmidt 4025b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 4026b8e95489SMiao Xie ret = mnt_want_write_file(file); 4027b8e95489SMiao Xie if (ret) 4028b8e95489SMiao Xie goto out; 4029b8e95489SMiao Xie } 4030b8e95489SMiao Xie 40310b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 403263a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 403363a212abSStefan Behrens 0); 4034475f6387SJan Schmidt 40355afe6ce7SFilipe Manana /* 40365afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 40375afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 40385afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 40395afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 40405afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 40415afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 40425afe6ce7SFilipe Manana * previously (btrfs-progs does this). 40435afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 40445afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 40455afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 40465afe6ce7SFilipe Manana */ 40475afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 4048475f6387SJan Schmidt ret = -EFAULT; 4049475f6387SJan Schmidt 4050b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 4051b8e95489SMiao Xie mnt_drop_write_file(file); 4052b8e95489SMiao Xie out: 4053475f6387SJan Schmidt kfree(sa); 4054475f6387SJan Schmidt return ret; 4055475f6387SJan Schmidt } 4056475f6387SJan Schmidt 40572ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 4058475f6387SJan Schmidt { 4059475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4060475f6387SJan Schmidt return -EPERM; 4061475f6387SJan Schmidt 40622ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 4063475f6387SJan Schmidt } 4064475f6387SJan Schmidt 40652ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 4066475f6387SJan Schmidt void __user *arg) 4067475f6387SJan Schmidt { 4068475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4069475f6387SJan Schmidt int ret; 4070475f6387SJan Schmidt 4071475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4072475f6387SJan Schmidt return -EPERM; 4073475f6387SJan Schmidt 4074475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4075475f6387SJan Schmidt if (IS_ERR(sa)) 4076475f6387SJan Schmidt return PTR_ERR(sa); 4077475f6387SJan Schmidt 40782ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 4079475f6387SJan Schmidt 40804fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 4081475f6387SJan Schmidt ret = -EFAULT; 4082475f6387SJan Schmidt 4083475f6387SJan Schmidt kfree(sa); 4084475f6387SJan Schmidt return ret; 4085475f6387SJan Schmidt } 4086475f6387SJan Schmidt 40872ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 4088b27f7c0cSDavid Sterba void __user *arg) 4089c11d2c23SStefan Behrens { 4090c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 4091c11d2c23SStefan Behrens int ret; 4092c11d2c23SStefan Behrens 4093c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 4094c11d2c23SStefan Behrens if (IS_ERR(sa)) 4095c11d2c23SStefan Behrens return PTR_ERR(sa); 4096c11d2c23SStefan Behrens 4097b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 4098b27f7c0cSDavid Sterba kfree(sa); 4099b27f7c0cSDavid Sterba return -EPERM; 4100b27f7c0cSDavid Sterba } 4101b27f7c0cSDavid Sterba 41022ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 4103c11d2c23SStefan Behrens 4104eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 4105c11d2c23SStefan Behrens ret = -EFAULT; 4106c11d2c23SStefan Behrens 4107c11d2c23SStefan Behrens kfree(sa); 4108c11d2c23SStefan Behrens return ret; 4109c11d2c23SStefan Behrens } 4110c11d2c23SStefan Behrens 41112ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 41122ff7e61eSJeff Mahoney void __user *arg) 41133f6bcfbdSStefan Behrens { 41143f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 41153f6bcfbdSStefan Behrens int ret; 41163f6bcfbdSStefan Behrens 41173f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 41183f6bcfbdSStefan Behrens return -EPERM; 41193f6bcfbdSStefan Behrens 4120914a519bSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 4121914a519bSJosef Bacik btrfs_err(fs_info, "device replace not supported on extent tree v2 yet"); 4122914a519bSJosef Bacik return -EINVAL; 4123914a519bSJosef Bacik } 4124914a519bSJosef Bacik 41253f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 41263f6bcfbdSStefan Behrens if (IS_ERR(p)) 41273f6bcfbdSStefan Behrens return PTR_ERR(p); 41283f6bcfbdSStefan Behrens 41293f6bcfbdSStefan Behrens switch (p->cmd) { 41303f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 4131bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 4132adfa97cbSIlya Dryomov ret = -EROFS; 4133adfa97cbSIlya Dryomov goto out; 4134adfa97cbSIlya Dryomov } 4135c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 4136e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 41373f6bcfbdSStefan Behrens } else { 41382ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 4139c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 41403f6bcfbdSStefan Behrens } 41413f6bcfbdSStefan Behrens break; 41423f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 41430b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 41443f6bcfbdSStefan Behrens ret = 0; 41453f6bcfbdSStefan Behrens break; 41463f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 414717d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 414897282031SAnand Jain ret = 0; 41493f6bcfbdSStefan Behrens break; 41503f6bcfbdSStefan Behrens default: 41513f6bcfbdSStefan Behrens ret = -EINVAL; 41523f6bcfbdSStefan Behrens break; 41533f6bcfbdSStefan Behrens } 41543f6bcfbdSStefan Behrens 4155d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 41563f6bcfbdSStefan Behrens ret = -EFAULT; 4157adfa97cbSIlya Dryomov out: 41583f6bcfbdSStefan Behrens kfree(p); 41593f6bcfbdSStefan Behrens return ret; 41603f6bcfbdSStefan Behrens } 41613f6bcfbdSStefan Behrens 4162d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 4163d7728c96SJan Schmidt { 4164d7728c96SJan Schmidt int ret = 0; 4165d7728c96SJan Schmidt int i; 4166740c3d22SChris Mason u64 rel_ptr; 4167d7728c96SJan Schmidt int size; 4168806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 4169d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 4170d7728c96SJan Schmidt struct btrfs_path *path; 4171d7728c96SJan Schmidt 417282b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 4173d7728c96SJan Schmidt return -EPERM; 4174d7728c96SJan Schmidt 4175d7728c96SJan Schmidt path = btrfs_alloc_path(); 4176d7728c96SJan Schmidt if (!path) { 4177d7728c96SJan Schmidt ret = -ENOMEM; 4178d7728c96SJan Schmidt goto out; 4179d7728c96SJan Schmidt } 4180d7728c96SJan Schmidt 4181d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 4182d7728c96SJan Schmidt if (IS_ERR(ipa)) { 4183d7728c96SJan Schmidt ret = PTR_ERR(ipa); 4184d7728c96SJan Schmidt ipa = NULL; 4185d7728c96SJan Schmidt goto out; 4186d7728c96SJan Schmidt } 4187d7728c96SJan Schmidt 4188d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 4189d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 4190d7728c96SJan Schmidt if (IS_ERR(ipath)) { 4191d7728c96SJan Schmidt ret = PTR_ERR(ipath); 4192d7728c96SJan Schmidt ipath = NULL; 4193d7728c96SJan Schmidt goto out; 4194d7728c96SJan Schmidt } 4195d7728c96SJan Schmidt 4196d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 4197d7728c96SJan Schmidt if (ret < 0) 4198d7728c96SJan Schmidt goto out; 4199d7728c96SJan Schmidt 4200d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 4201745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 4202745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 4203740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 4204d7728c96SJan Schmidt } 4205d7728c96SJan Schmidt 4206718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 4207718dc5faSOmar Sandoval ipath->fspath, size); 4208d7728c96SJan Schmidt if (ret) { 4209d7728c96SJan Schmidt ret = -EFAULT; 4210d7728c96SJan Schmidt goto out; 4211d7728c96SJan Schmidt } 4212d7728c96SJan Schmidt 4213d7728c96SJan Schmidt out: 4214d7728c96SJan Schmidt btrfs_free_path(path); 4215d7728c96SJan Schmidt free_ipath(ipath); 4216d7728c96SJan Schmidt kfree(ipa); 4217d7728c96SJan Schmidt 4218d7728c96SJan Schmidt return ret; 4219d7728c96SJan Schmidt } 4220d7728c96SJan Schmidt 4221d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 4222d7728c96SJan Schmidt { 4223d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 4224d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 4225d7728c96SJan Schmidt 4226d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 4227d7728c96SJan Schmidt inodes->bytes_left -= c; 4228d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 4229d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 4230d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 4231d7728c96SJan Schmidt inodes->elem_cnt += 3; 4232d7728c96SJan Schmidt } else { 4233d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 4234d7728c96SJan Schmidt inodes->bytes_left = 0; 4235d7728c96SJan Schmidt inodes->elem_missed += 3; 4236d7728c96SJan Schmidt } 4237d7728c96SJan Schmidt 4238d7728c96SJan Schmidt return 0; 4239d7728c96SJan Schmidt } 4240d7728c96SJan Schmidt 42412ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 4242d24a67b2SZygo Blaxell void __user *arg, int version) 4243d7728c96SJan Schmidt { 4244d7728c96SJan Schmidt int ret = 0; 4245d7728c96SJan Schmidt int size; 4246d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 4247d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 4248d7728c96SJan Schmidt struct btrfs_path *path = NULL; 4249d24a67b2SZygo Blaxell bool ignore_offset; 4250d7728c96SJan Schmidt 4251d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4252d7728c96SJan Schmidt return -EPERM; 4253d7728c96SJan Schmidt 4254d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 42557b9ea627SShailendra Verma if (IS_ERR(loi)) 42567b9ea627SShailendra Verma return PTR_ERR(loi); 4257d7728c96SJan Schmidt 4258d24a67b2SZygo Blaxell if (version == 1) { 4259d24a67b2SZygo Blaxell ignore_offset = false; 4260b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 4261d24a67b2SZygo Blaxell } else { 4262d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 4263d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 4264d24a67b2SZygo Blaxell ret = -EINVAL; 4265d24a67b2SZygo Blaxell goto out_loi; 4266d24a67b2SZygo Blaxell } 4267d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 4268d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 4269d24a67b2SZygo Blaxell ret = -EINVAL; 4270d24a67b2SZygo Blaxell goto out_loi; 4271d24a67b2SZygo Blaxell } 4272d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 4273b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 4274d24a67b2SZygo Blaxell } 4275d24a67b2SZygo Blaxell 4276d7728c96SJan Schmidt path = btrfs_alloc_path(); 4277d7728c96SJan Schmidt if (!path) { 4278d7728c96SJan Schmidt ret = -ENOMEM; 4279d7728c96SJan Schmidt goto out; 4280d7728c96SJan Schmidt } 4281d7728c96SJan Schmidt 4282d7728c96SJan Schmidt inodes = init_data_container(size); 4283d7728c96SJan Schmidt if (IS_ERR(inodes)) { 4284d7728c96SJan Schmidt ret = PTR_ERR(inodes); 4285d7728c96SJan Schmidt inodes = NULL; 4286d7728c96SJan Schmidt goto out; 4287d7728c96SJan Schmidt } 4288d7728c96SJan Schmidt 42892ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 4290d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 4291df031f07SLiu Bo if (ret == -EINVAL) 4292d7728c96SJan Schmidt ret = -ENOENT; 4293d7728c96SJan Schmidt if (ret < 0) 4294d7728c96SJan Schmidt goto out; 4295d7728c96SJan Schmidt 4296718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 4297718dc5faSOmar Sandoval size); 4298d7728c96SJan Schmidt if (ret) 4299d7728c96SJan Schmidt ret = -EFAULT; 4300d7728c96SJan Schmidt 4301d7728c96SJan Schmidt out: 4302d7728c96SJan Schmidt btrfs_free_path(path); 4303f54de068SDavid Sterba kvfree(inodes); 4304d24a67b2SZygo Blaxell out_loi: 4305d7728c96SJan Schmidt kfree(loi); 4306d7728c96SJan Schmidt 4307d7728c96SJan Schmidt return ret; 4308d7728c96SJan Schmidt } 4309d7728c96SJan Schmidt 4310008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 4311c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 4312c9e9f97bSIlya Dryomov { 4313c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 4314c9e9f97bSIlya Dryomov 4315c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 4316c9e9f97bSIlya Dryomov 43173009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 4318837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 4319837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 4320837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 4321a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 4322a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 4323837d5b6eSIlya Dryomov 4324c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 4325c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 4326c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 432719a39dceSIlya Dryomov 432819a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 432919a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 433019a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 4331c9e9f97bSIlya Dryomov } 4332c9e9f97bSIlya Dryomov 43339ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4334c9e9f97bSIlya Dryomov { 4335496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4336c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4337c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4338c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4339ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4340c9e9f97bSIlya Dryomov int ret; 4341c9e9f97bSIlya Dryomov 43426c405b24SNikolay Borisov if (!arg) 43436c405b24SNikolay Borisov btrfs_warn(fs_info, 43446c405b24SNikolay Borisov "IOC_BALANCE ioctl (v1) is deprecated and will be removed in kernel 5.18"); 43456c405b24SNikolay Borisov 4346c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4347c9e9f97bSIlya Dryomov return -EPERM; 4348c9e9f97bSIlya Dryomov 4349e54bfa31SLiu Bo ret = mnt_want_write_file(file); 43509ba1f6e4SLiu Bo if (ret) 43519ba1f6e4SLiu Bo return ret; 43529ba1f6e4SLiu Bo 4353ed0fb78fSIlya Dryomov again: 4354c3e1f96cSGoldwyn Rodrigues if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 4355c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4356ed0fb78fSIlya Dryomov need_unlock = true; 4357ed0fb78fSIlya Dryomov goto locked; 4358ed0fb78fSIlya Dryomov } 4359ed0fb78fSIlya Dryomov 4360ed0fb78fSIlya Dryomov /* 436101327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 4362ed0fb78fSIlya Dryomov * (1) some other op is running 4363ed0fb78fSIlya Dryomov * (2) balance is running 4364ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4365ed0fb78fSIlya Dryomov */ 4366ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4367ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4368ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 43693009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4370ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4371dccdb07bSDavid Sterba /* 4372dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 4373dccdb07bSDavid Sterba * we'll reexamine the status again. 4374dccdb07bSDavid Sterba */ 4375ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4376ed0fb78fSIlya Dryomov 4377ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 43783009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4379ed0fb78fSIlya Dryomov /* this is (3) */ 4380ed0fb78fSIlya Dryomov need_unlock = false; 4381ed0fb78fSIlya Dryomov goto locked; 4382ed0fb78fSIlya Dryomov } 4383ed0fb78fSIlya Dryomov 4384ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4385ed0fb78fSIlya Dryomov goto again; 4386ed0fb78fSIlya Dryomov } else { 4387ed0fb78fSIlya Dryomov /* this is (2) */ 4388ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4389ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4390ed0fb78fSIlya Dryomov goto out; 4391ed0fb78fSIlya Dryomov } 4392ed0fb78fSIlya Dryomov } else { 4393ed0fb78fSIlya Dryomov /* this is (1) */ 4394ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4395e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4396ed0fb78fSIlya Dryomov goto out; 4397ed0fb78fSIlya Dryomov } 4398ed0fb78fSIlya Dryomov 4399ed0fb78fSIlya Dryomov locked: 4400c9e9f97bSIlya Dryomov 4401c9e9f97bSIlya Dryomov if (arg) { 4402c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4403c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4404c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4405ed0fb78fSIlya Dryomov goto out_unlock; 4406c9e9f97bSIlya Dryomov } 4407de322263SIlya Dryomov 4408de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4409de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4410de322263SIlya Dryomov ret = -ENOTCONN; 4411de322263SIlya Dryomov goto out_bargs; 4412de322263SIlya Dryomov } 4413de322263SIlya Dryomov 4414de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4415de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4416de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4417de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4418efc0e69cSNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE); 4419de322263SIlya Dryomov 4420de322263SIlya Dryomov goto do_balance; 4421de322263SIlya Dryomov } 4422c9e9f97bSIlya Dryomov } else { 4423c9e9f97bSIlya Dryomov bargs = NULL; 4424c9e9f97bSIlya Dryomov } 4425c9e9f97bSIlya Dryomov 4426ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4427837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4428837d5b6eSIlya Dryomov goto out_bargs; 4429837d5b6eSIlya Dryomov } 4430837d5b6eSIlya Dryomov 44318d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4432c9e9f97bSIlya Dryomov if (!bctl) { 4433c9e9f97bSIlya Dryomov ret = -ENOMEM; 4434c9e9f97bSIlya Dryomov goto out_bargs; 4435c9e9f97bSIlya Dryomov } 4436c9e9f97bSIlya Dryomov 4437c9e9f97bSIlya Dryomov if (arg) { 4438c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4439c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4440c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4441c9e9f97bSIlya Dryomov 4442c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4443f43ffb60SIlya Dryomov } else { 4444f43ffb60SIlya Dryomov /* balance everything - no filters */ 4445f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4446c9e9f97bSIlya Dryomov } 4447c9e9f97bSIlya Dryomov 44488eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 44498eb93459SDavid Sterba ret = -EINVAL; 44500f89abf5SChristian Engelmayer goto out_bctl; 44518eb93459SDavid Sterba } 44528eb93459SDavid Sterba 4453de322263SIlya Dryomov do_balance: 4454c9e9f97bSIlya Dryomov /* 4455c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 4456c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 4457c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 4458c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 4459c9e9f97bSIlya Dryomov */ 4460ed0fb78fSIlya Dryomov need_unlock = false; 4461ed0fb78fSIlya Dryomov 44626fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 44630f89abf5SChristian Engelmayer bctl = NULL; 4464ed0fb78fSIlya Dryomov 4465d00c2d9cSFilipe Manana if ((ret == 0 || ret == -ECANCELED) && arg) { 4466c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4467c9e9f97bSIlya Dryomov ret = -EFAULT; 4468c9e9f97bSIlya Dryomov } 4469c9e9f97bSIlya Dryomov 44700f89abf5SChristian Engelmayer out_bctl: 44710f89abf5SChristian Engelmayer kfree(bctl); 4472c9e9f97bSIlya Dryomov out_bargs: 4473c9e9f97bSIlya Dryomov kfree(bargs); 4474ed0fb78fSIlya Dryomov out_unlock: 4475c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4476ed0fb78fSIlya Dryomov if (need_unlock) 4477c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 4478ed0fb78fSIlya Dryomov out: 4479e54bfa31SLiu Bo mnt_drop_write_file(file); 4480c9e9f97bSIlya Dryomov return ret; 4481c9e9f97bSIlya Dryomov } 4482c9e9f97bSIlya Dryomov 44832ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4484837d5b6eSIlya Dryomov { 4485837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4486837d5b6eSIlya Dryomov return -EPERM; 4487837d5b6eSIlya Dryomov 4488837d5b6eSIlya Dryomov switch (cmd) { 4489837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 44900b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4491a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 44920b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4493837d5b6eSIlya Dryomov } 4494837d5b6eSIlya Dryomov 4495837d5b6eSIlya Dryomov return -EINVAL; 4496837d5b6eSIlya Dryomov } 4497837d5b6eSIlya Dryomov 44982ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 449919a39dceSIlya Dryomov void __user *arg) 450019a39dceSIlya Dryomov { 450119a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 450219a39dceSIlya Dryomov int ret = 0; 450319a39dceSIlya Dryomov 450419a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 450519a39dceSIlya Dryomov return -EPERM; 450619a39dceSIlya Dryomov 450719a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 450819a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 450919a39dceSIlya Dryomov ret = -ENOTCONN; 451019a39dceSIlya Dryomov goto out; 451119a39dceSIlya Dryomov } 451219a39dceSIlya Dryomov 45138d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 451419a39dceSIlya Dryomov if (!bargs) { 451519a39dceSIlya Dryomov ret = -ENOMEM; 451619a39dceSIlya Dryomov goto out; 451719a39dceSIlya Dryomov } 451819a39dceSIlya Dryomov 4519008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 452019a39dceSIlya Dryomov 452119a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 452219a39dceSIlya Dryomov ret = -EFAULT; 452319a39dceSIlya Dryomov 452419a39dceSIlya Dryomov kfree(bargs); 452519a39dceSIlya Dryomov out: 452619a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 452719a39dceSIlya Dryomov return ret; 452819a39dceSIlya Dryomov } 452919a39dceSIlya Dryomov 4530905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 45315d13a37bSArne Jansen { 45320b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45330b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45345d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 45355d13a37bSArne Jansen int ret; 45365d13a37bSArne Jansen 45375d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 45385d13a37bSArne Jansen return -EPERM; 45395d13a37bSArne Jansen 4540905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4541905b0ddaSMiao Xie if (ret) 4542905b0ddaSMiao Xie return ret; 45435d13a37bSArne Jansen 45445d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4545905b0ddaSMiao Xie if (IS_ERR(sa)) { 4546905b0ddaSMiao Xie ret = PTR_ERR(sa); 4547905b0ddaSMiao Xie goto drop_write; 4548905b0ddaSMiao Xie } 45495d13a37bSArne Jansen 45500b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 45515d13a37bSArne Jansen 45525d13a37bSArne Jansen switch (sa->cmd) { 45535d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4554340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 45555d13a37bSArne Jansen break; 45565d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4557340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 45585d13a37bSArne Jansen break; 45595d13a37bSArne Jansen default: 45605d13a37bSArne Jansen ret = -EINVAL; 45615d13a37bSArne Jansen break; 45625d13a37bSArne Jansen } 45635d13a37bSArne Jansen 45645d13a37bSArne Jansen kfree(sa); 45650b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4566905b0ddaSMiao Xie drop_write: 4567905b0ddaSMiao Xie mnt_drop_write_file(file); 45685d13a37bSArne Jansen return ret; 45695d13a37bSArne Jansen } 45705d13a37bSArne Jansen 4571905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 45725d13a37bSArne Jansen { 45730b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45740b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45750b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 45765d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 45775d13a37bSArne Jansen struct btrfs_trans_handle *trans; 45785d13a37bSArne Jansen int ret; 45795d13a37bSArne Jansen int err; 45805d13a37bSArne Jansen 45815d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 45825d13a37bSArne Jansen return -EPERM; 45835d13a37bSArne Jansen 4584905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4585905b0ddaSMiao Xie if (ret) 4586905b0ddaSMiao Xie return ret; 45875d13a37bSArne Jansen 45885d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4589905b0ddaSMiao Xie if (IS_ERR(sa)) { 4590905b0ddaSMiao Xie ret = PTR_ERR(sa); 4591905b0ddaSMiao Xie goto drop_write; 4592905b0ddaSMiao Xie } 45935d13a37bSArne Jansen 45945d13a37bSArne Jansen trans = btrfs_join_transaction(root); 45955d13a37bSArne Jansen if (IS_ERR(trans)) { 45965d13a37bSArne Jansen ret = PTR_ERR(trans); 45975d13a37bSArne Jansen goto out; 45985d13a37bSArne Jansen } 45995d13a37bSArne Jansen 46005d13a37bSArne Jansen if (sa->assign) { 46019f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 46025d13a37bSArne Jansen } else { 460339616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 46045d13a37bSArne Jansen } 46055d13a37bSArne Jansen 4606e082f563SQu Wenruo /* update qgroup status and info */ 4607280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4608e082f563SQu Wenruo if (err < 0) 46090b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4610ad8403dfSAnand Jain "failed to update qgroup status and info"); 46113a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 46125d13a37bSArne Jansen if (err && !ret) 46135d13a37bSArne Jansen ret = err; 46145d13a37bSArne Jansen 46155d13a37bSArne Jansen out: 46165d13a37bSArne Jansen kfree(sa); 4617905b0ddaSMiao Xie drop_write: 4618905b0ddaSMiao Xie mnt_drop_write_file(file); 46195d13a37bSArne Jansen return ret; 46205d13a37bSArne Jansen } 46215d13a37bSArne Jansen 4622905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 46235d13a37bSArne Jansen { 46240b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46250b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46265d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 46275d13a37bSArne Jansen struct btrfs_trans_handle *trans; 46285d13a37bSArne Jansen int ret; 46295d13a37bSArne Jansen int err; 46305d13a37bSArne Jansen 46315d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 46325d13a37bSArne Jansen return -EPERM; 46335d13a37bSArne Jansen 4634905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4635905b0ddaSMiao Xie if (ret) 4636905b0ddaSMiao Xie return ret; 46375d13a37bSArne Jansen 46385d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4639905b0ddaSMiao Xie if (IS_ERR(sa)) { 4640905b0ddaSMiao Xie ret = PTR_ERR(sa); 4641905b0ddaSMiao Xie goto drop_write; 4642905b0ddaSMiao Xie } 46435d13a37bSArne Jansen 4644d86e56cfSMiao Xie if (!sa->qgroupid) { 4645d86e56cfSMiao Xie ret = -EINVAL; 4646d86e56cfSMiao Xie goto out; 4647d86e56cfSMiao Xie } 4648d86e56cfSMiao Xie 46495d13a37bSArne Jansen trans = btrfs_join_transaction(root); 46505d13a37bSArne Jansen if (IS_ERR(trans)) { 46515d13a37bSArne Jansen ret = PTR_ERR(trans); 46525d13a37bSArne Jansen goto out; 46535d13a37bSArne Jansen } 46545d13a37bSArne Jansen 46555d13a37bSArne Jansen if (sa->create) { 465649a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 46575d13a37bSArne Jansen } else { 46583efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 46595d13a37bSArne Jansen } 46605d13a37bSArne Jansen 46613a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 46625d13a37bSArne Jansen if (err && !ret) 46635d13a37bSArne Jansen ret = err; 46645d13a37bSArne Jansen 46655d13a37bSArne Jansen out: 46665d13a37bSArne Jansen kfree(sa); 4667905b0ddaSMiao Xie drop_write: 4668905b0ddaSMiao Xie mnt_drop_write_file(file); 46695d13a37bSArne Jansen return ret; 46705d13a37bSArne Jansen } 46715d13a37bSArne Jansen 4672905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 46735d13a37bSArne Jansen { 46740b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46750b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46765d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 46775d13a37bSArne Jansen struct btrfs_trans_handle *trans; 46785d13a37bSArne Jansen int ret; 46795d13a37bSArne Jansen int err; 46805d13a37bSArne Jansen u64 qgroupid; 46815d13a37bSArne Jansen 46825d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 46835d13a37bSArne Jansen return -EPERM; 46845d13a37bSArne Jansen 4685905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4686905b0ddaSMiao Xie if (ret) 4687905b0ddaSMiao Xie return ret; 46885d13a37bSArne Jansen 46895d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4690905b0ddaSMiao Xie if (IS_ERR(sa)) { 4691905b0ddaSMiao Xie ret = PTR_ERR(sa); 4692905b0ddaSMiao Xie goto drop_write; 4693905b0ddaSMiao Xie } 46945d13a37bSArne Jansen 46955d13a37bSArne Jansen trans = btrfs_join_transaction(root); 46965d13a37bSArne Jansen if (IS_ERR(trans)) { 46975d13a37bSArne Jansen ret = PTR_ERR(trans); 46985d13a37bSArne Jansen goto out; 46995d13a37bSArne Jansen } 47005d13a37bSArne Jansen 47015d13a37bSArne Jansen qgroupid = sa->qgroupid; 47025d13a37bSArne Jansen if (!qgroupid) { 47035d13a37bSArne Jansen /* take the current subvol as qgroup */ 47045d13a37bSArne Jansen qgroupid = root->root_key.objectid; 47055d13a37bSArne Jansen } 47065d13a37bSArne Jansen 4707f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 47085d13a37bSArne Jansen 47093a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 47105d13a37bSArne Jansen if (err && !ret) 47115d13a37bSArne Jansen ret = err; 47125d13a37bSArne Jansen 47135d13a37bSArne Jansen out: 47145d13a37bSArne Jansen kfree(sa); 4715905b0ddaSMiao Xie drop_write: 4716905b0ddaSMiao Xie mnt_drop_write_file(file); 47175d13a37bSArne Jansen return ret; 47185d13a37bSArne Jansen } 47195d13a37bSArne Jansen 47202f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 47212f232036SJan Schmidt { 47220b246afaSJeff Mahoney struct inode *inode = file_inode(file); 47230b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 47242f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 47252f232036SJan Schmidt int ret; 47262f232036SJan Schmidt 47272f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 47282f232036SJan Schmidt return -EPERM; 47292f232036SJan Schmidt 47302f232036SJan Schmidt ret = mnt_want_write_file(file); 47312f232036SJan Schmidt if (ret) 47322f232036SJan Schmidt return ret; 47332f232036SJan Schmidt 47342f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 47352f232036SJan Schmidt if (IS_ERR(qsa)) { 47362f232036SJan Schmidt ret = PTR_ERR(qsa); 47372f232036SJan Schmidt goto drop_write; 47382f232036SJan Schmidt } 47392f232036SJan Schmidt 47402f232036SJan Schmidt if (qsa->flags) { 47412f232036SJan Schmidt ret = -EINVAL; 47422f232036SJan Schmidt goto out; 47432f232036SJan Schmidt } 47442f232036SJan Schmidt 47450b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 47462f232036SJan Schmidt 47472f232036SJan Schmidt out: 47482f232036SJan Schmidt kfree(qsa); 47492f232036SJan Schmidt drop_write: 47502f232036SJan Schmidt mnt_drop_write_file(file); 47512f232036SJan Schmidt return ret; 47522f232036SJan Schmidt } 47532f232036SJan Schmidt 4754b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4755b929c1d8SMarcos Paulo de Souza void __user *arg) 47562f232036SJan Schmidt { 47570afb603aSGoldwyn Rodrigues struct btrfs_ioctl_quota_rescan_args qsa = {0}; 47582f232036SJan Schmidt 47592f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 47602f232036SJan Schmidt return -EPERM; 47612f232036SJan Schmidt 47620b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 47630afb603aSGoldwyn Rodrigues qsa.flags = 1; 47640afb603aSGoldwyn Rodrigues qsa.progress = fs_info->qgroup_rescan_progress.objectid; 47652f232036SJan Schmidt } 47662f232036SJan Schmidt 47670afb603aSGoldwyn Rodrigues if (copy_to_user(arg, &qsa, sizeof(qsa))) 4768991a3daeSAnand Jain return -EFAULT; 47692f232036SJan Schmidt 4770991a3daeSAnand Jain return 0; 47712f232036SJan Schmidt } 47722f232036SJan Schmidt 4773b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4774b929c1d8SMarcos Paulo de Souza void __user *arg) 477557254b6eSJan Schmidt { 477657254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 477757254b6eSJan Schmidt return -EPERM; 477857254b6eSJan Schmidt 47790b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 478057254b6eSJan Schmidt } 478157254b6eSJan Schmidt 4782abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4783e4fed17aSChristian Brauner struct user_namespace *mnt_userns, 4784abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 47858ea05e3aSAlexander Block { 4786496ad9aaSAl Viro struct inode *inode = file_inode(file); 47870b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 47888ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 47898ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 47908ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 479195582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 47928ea05e3aSAlexander Block int ret = 0; 4793dd5f9615SStefan Behrens int received_uuid_changed; 47948ea05e3aSAlexander Block 4795e4fed17aSChristian Brauner if (!inode_owner_or_capable(mnt_userns, inode)) 4796bd60ea0fSDavid Sterba return -EPERM; 4797bd60ea0fSDavid Sterba 47988ea05e3aSAlexander Block ret = mnt_want_write_file(file); 47998ea05e3aSAlexander Block if (ret < 0) 48008ea05e3aSAlexander Block return ret; 48018ea05e3aSAlexander Block 48020b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 48038ea05e3aSAlexander Block 48044a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 48058ea05e3aSAlexander Block ret = -EINVAL; 48068ea05e3aSAlexander Block goto out; 48078ea05e3aSAlexander Block } 48088ea05e3aSAlexander Block 48098ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 48108ea05e3aSAlexander Block ret = -EROFS; 48118ea05e3aSAlexander Block goto out; 48128ea05e3aSAlexander Block } 48138ea05e3aSAlexander Block 4814dd5f9615SStefan Behrens /* 4815dd5f9615SStefan Behrens * 1 - root item 4816dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4817dd5f9615SStefan Behrens */ 4818dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 48198ea05e3aSAlexander Block if (IS_ERR(trans)) { 48208ea05e3aSAlexander Block ret = PTR_ERR(trans); 48218ea05e3aSAlexander Block trans = NULL; 48228ea05e3aSAlexander Block goto out; 48238ea05e3aSAlexander Block } 48248ea05e3aSAlexander Block 48258ea05e3aSAlexander Block sa->rtransid = trans->transid; 48268ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 48278ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 48288ea05e3aSAlexander Block 4829dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4830dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4831dd5f9615SStefan Behrens if (received_uuid_changed && 4832d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4833d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4834dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4835dd5f9615SStefan Behrens root->root_key.objectid); 4836d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4837d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4838d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4839d87ff758SNikolay Borisov goto out; 4840d87ff758SNikolay Borisov } 4841d87ff758SNikolay Borisov } 48428ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 48438ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 48448ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 48453cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 48463cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 48473cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 48483cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 48498ea05e3aSAlexander Block 48500b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 48518ea05e3aSAlexander Block &root->root_key, &root->root_item); 48528ea05e3aSAlexander Block if (ret < 0) { 48533a45bb20SJeff Mahoney btrfs_end_transaction(trans); 48548ea05e3aSAlexander Block goto out; 4855dd5f9615SStefan Behrens } 4856dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4857cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4858dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4859dd5f9615SStefan Behrens root->root_key.objectid); 4860dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 486166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4862efd38150SNikolay Borisov btrfs_end_transaction(trans); 4863dd5f9615SStefan Behrens goto out; 4864dd5f9615SStefan Behrens } 4865dd5f9615SStefan Behrens } 48663a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4867abccd00fSHugo Mills out: 48680b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4869abccd00fSHugo Mills mnt_drop_write_file(file); 4870abccd00fSHugo Mills return ret; 4871abccd00fSHugo Mills } 4872abccd00fSHugo Mills 4873abccd00fSHugo Mills #ifdef CONFIG_64BIT 4874abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4875abccd00fSHugo Mills void __user *arg) 4876abccd00fSHugo Mills { 4877abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4878abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4879abccd00fSHugo Mills int ret = 0; 4880abccd00fSHugo Mills 4881abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 48827b9ea627SShailendra Verma if (IS_ERR(args32)) 48837b9ea627SShailendra Verma return PTR_ERR(args32); 4884abccd00fSHugo Mills 48858d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 488684dbeb87SDan Carpenter if (!args64) { 488784dbeb87SDan Carpenter ret = -ENOMEM; 4888abccd00fSHugo Mills goto out; 4889abccd00fSHugo Mills } 4890abccd00fSHugo Mills 4891abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4892abccd00fSHugo Mills args64->stransid = args32->stransid; 4893abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4894abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4895abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4896abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4897abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4898abccd00fSHugo Mills args64->flags = args32->flags; 4899abccd00fSHugo Mills 4900e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), args64); 4901abccd00fSHugo Mills if (ret) 4902abccd00fSHugo Mills goto out; 4903abccd00fSHugo Mills 4904abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4905abccd00fSHugo Mills args32->stransid = args64->stransid; 4906abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4907abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4908abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4909abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4910abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4911abccd00fSHugo Mills args32->flags = args64->flags; 4912abccd00fSHugo Mills 4913abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4914abccd00fSHugo Mills if (ret) 4915abccd00fSHugo Mills ret = -EFAULT; 4916abccd00fSHugo Mills 4917abccd00fSHugo Mills out: 4918abccd00fSHugo Mills kfree(args32); 4919abccd00fSHugo Mills kfree(args64); 4920abccd00fSHugo Mills return ret; 4921abccd00fSHugo Mills } 4922abccd00fSHugo Mills #endif 4923abccd00fSHugo Mills 4924abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4925abccd00fSHugo Mills void __user *arg) 4926abccd00fSHugo Mills { 4927abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4928abccd00fSHugo Mills int ret = 0; 4929abccd00fSHugo Mills 4930abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 49317b9ea627SShailendra Verma if (IS_ERR(sa)) 49327b9ea627SShailendra Verma return PTR_ERR(sa); 4933abccd00fSHugo Mills 4934e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), sa); 4935abccd00fSHugo Mills 4936abccd00fSHugo Mills if (ret) 4937abccd00fSHugo Mills goto out; 4938abccd00fSHugo Mills 49398ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 49408ea05e3aSAlexander Block if (ret) 49418ea05e3aSAlexander Block ret = -EFAULT; 49428ea05e3aSAlexander Block 49438ea05e3aSAlexander Block out: 49448ea05e3aSAlexander Block kfree(sa); 49458ea05e3aSAlexander Block return ret; 49468ea05e3aSAlexander Block } 49478ea05e3aSAlexander Block 4948b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4949b929c1d8SMarcos Paulo de Souza void __user *arg) 4950867ab667Sjeff.liu { 4951a1b83ac5SAnand Jain size_t len; 4952867ab667Sjeff.liu int ret; 4953a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4954a1b83ac5SAnand Jain 49550b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 49560b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 49570b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4958a1b83ac5SAnand Jain 4959a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4960867ab667Sjeff.liu 4961867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 49620b246afaSJeff Mahoney btrfs_warn(fs_info, 49630b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 49640b246afaSJeff Mahoney --len); 4965867ab667Sjeff.liu } 4966867ab667Sjeff.liu 4967867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4968867ab667Sjeff.liu 4969867ab667Sjeff.liu return ret ? -EFAULT : 0; 4970867ab667Sjeff.liu } 4971867ab667Sjeff.liu 4972a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4973a8bfd4abSjeff.liu { 49740b246afaSJeff Mahoney struct inode *inode = file_inode(file); 49750b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 49760b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 49770b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4978a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4979a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4980a8bfd4abSjeff.liu int ret; 4981a8bfd4abSjeff.liu 4982a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4983a8bfd4abSjeff.liu return -EPERM; 4984a8bfd4abSjeff.liu 4985a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4986a8bfd4abSjeff.liu return -EFAULT; 4987a8bfd4abSjeff.liu 4988a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 49890b246afaSJeff Mahoney btrfs_err(fs_info, 49905d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4991a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4992a8bfd4abSjeff.liu return -EINVAL; 4993a8bfd4abSjeff.liu } 4994a8bfd4abSjeff.liu 4995a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4996a8bfd4abSjeff.liu if (ret) 4997a8bfd4abSjeff.liu return ret; 4998a8bfd4abSjeff.liu 4999a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 5000a8bfd4abSjeff.liu if (IS_ERR(trans)) { 5001a8bfd4abSjeff.liu ret = PTR_ERR(trans); 5002a8bfd4abSjeff.liu goto out_unlock; 5003a8bfd4abSjeff.liu } 5004a8bfd4abSjeff.liu 50050b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 5006a8bfd4abSjeff.liu strcpy(super_block->label, label); 50070b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 50083a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 5009a8bfd4abSjeff.liu 5010a8bfd4abSjeff.liu out_unlock: 5011a8bfd4abSjeff.liu mnt_drop_write_file(file); 5012a8bfd4abSjeff.liu return ret; 5013a8bfd4abSjeff.liu } 5014a8bfd4abSjeff.liu 50152eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 50162eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 50172eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 50182eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 50192eaa055fSJeff Mahoney 5020d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 50212eaa055fSJeff Mahoney { 50224d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 50232eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 50242eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 50252eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 50262eaa055fSJeff Mahoney }; 50272eaa055fSJeff Mahoney 50282eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 50292eaa055fSJeff Mahoney return -EFAULT; 50302eaa055fSJeff Mahoney 50312eaa055fSJeff Mahoney return 0; 50322eaa055fSJeff Mahoney } 50332eaa055fSJeff Mahoney 5034b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 5035b929c1d8SMarcos Paulo de Souza void __user *arg) 50362eaa055fSJeff Mahoney { 50370b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 50382eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 50392eaa055fSJeff Mahoney 50402eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 50412eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 50422eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 50432eaa055fSJeff Mahoney 50442eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 50452eaa055fSJeff Mahoney return -EFAULT; 50462eaa055fSJeff Mahoney 50472eaa055fSJeff Mahoney return 0; 50482eaa055fSJeff Mahoney } 50492eaa055fSJeff Mahoney 50502ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 50513b02a68aSJeff Mahoney enum btrfs_feature_set set, 50522eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 50532eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 50542eaa055fSJeff Mahoney { 5055f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 50563b02a68aSJeff Mahoney char *names; 50572eaa055fSJeff Mahoney u64 disallowed, unsupported; 50582eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 50592eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 50602eaa055fSJeff Mahoney 50612eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 50622eaa055fSJeff Mahoney if (unsupported) { 50633b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 50643b02a68aSJeff Mahoney if (names) { 50650b246afaSJeff Mahoney btrfs_warn(fs_info, 50663b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 50673b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 50683b02a68aSJeff Mahoney kfree(names); 50693b02a68aSJeff Mahoney } else 50700b246afaSJeff Mahoney btrfs_warn(fs_info, 50712eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 50722eaa055fSJeff Mahoney type, unsupported); 50732eaa055fSJeff Mahoney return -EOPNOTSUPP; 50742eaa055fSJeff Mahoney } 50752eaa055fSJeff Mahoney 50762eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 50772eaa055fSJeff Mahoney if (disallowed) { 50783b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 50793b02a68aSJeff Mahoney if (names) { 50800b246afaSJeff Mahoney btrfs_warn(fs_info, 50813b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 50823b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 50833b02a68aSJeff Mahoney kfree(names); 50843b02a68aSJeff Mahoney } else 50850b246afaSJeff Mahoney btrfs_warn(fs_info, 50862eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 50872eaa055fSJeff Mahoney type, disallowed); 50882eaa055fSJeff Mahoney return -EPERM; 50892eaa055fSJeff Mahoney } 50902eaa055fSJeff Mahoney 50912eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 50922eaa055fSJeff Mahoney if (disallowed) { 50933b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 50943b02a68aSJeff Mahoney if (names) { 50950b246afaSJeff Mahoney btrfs_warn(fs_info, 50963b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 50973b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 50983b02a68aSJeff Mahoney kfree(names); 50993b02a68aSJeff Mahoney } else 51000b246afaSJeff Mahoney btrfs_warn(fs_info, 51012eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 51022eaa055fSJeff Mahoney type, disallowed); 51032eaa055fSJeff Mahoney return -EPERM; 51042eaa055fSJeff Mahoney } 51052eaa055fSJeff Mahoney 51062eaa055fSJeff Mahoney return 0; 51072eaa055fSJeff Mahoney } 51082eaa055fSJeff Mahoney 51092ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 51102ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 51112eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 51122eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 51132eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 51142eaa055fSJeff Mahoney 51152eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 51162eaa055fSJeff Mahoney { 51170b246afaSJeff Mahoney struct inode *inode = file_inode(file); 51180b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 51190b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 51200b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 51212eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 51222eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 51232eaa055fSJeff Mahoney u64 newflags; 51242eaa055fSJeff Mahoney int ret; 51252eaa055fSJeff Mahoney 51262eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 51272eaa055fSJeff Mahoney return -EPERM; 51282eaa055fSJeff Mahoney 51292eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 51302eaa055fSJeff Mahoney return -EFAULT; 51312eaa055fSJeff Mahoney 51322eaa055fSJeff Mahoney /* Nothing to do */ 51332eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 51342eaa055fSJeff Mahoney !flags[0].incompat_flags) 51352eaa055fSJeff Mahoney return 0; 51362eaa055fSJeff Mahoney 51372ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 51382eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 51392eaa055fSJeff Mahoney if (ret) 51402eaa055fSJeff Mahoney return ret; 51412eaa055fSJeff Mahoney 51422ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 51432eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 51442eaa055fSJeff Mahoney if (ret) 51452eaa055fSJeff Mahoney return ret; 51462eaa055fSJeff Mahoney 51472ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 51482eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 51492eaa055fSJeff Mahoney if (ret) 51502eaa055fSJeff Mahoney return ret; 51512eaa055fSJeff Mahoney 51527ab19625SDavid Sterba ret = mnt_want_write_file(file); 51537ab19625SDavid Sterba if (ret) 51547ab19625SDavid Sterba return ret; 51557ab19625SDavid Sterba 51568051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 51577ab19625SDavid Sterba if (IS_ERR(trans)) { 51587ab19625SDavid Sterba ret = PTR_ERR(trans); 51597ab19625SDavid Sterba goto out_drop_write; 51607ab19625SDavid Sterba } 51612eaa055fSJeff Mahoney 51620b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 51632eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 51642eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 51652eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 51662eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 51672eaa055fSJeff Mahoney 51682eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 51692eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 51702eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 51712eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 51722eaa055fSJeff Mahoney 51732eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 51742eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 51752eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 51762eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 51770b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 51782eaa055fSJeff Mahoney 51793a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 51807ab19625SDavid Sterba out_drop_write: 51817ab19625SDavid Sterba mnt_drop_write_file(file); 51827ab19625SDavid Sterba 51837ab19625SDavid Sterba return ret; 51842eaa055fSJeff Mahoney } 51852eaa055fSJeff Mahoney 51869ad12305SSahil Kang static int _btrfs_ioctl_send(struct inode *inode, void __user *argp, bool compat) 51872351f431SJosef Bacik { 51882351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 51892351f431SJosef Bacik int ret; 51902351f431SJosef Bacik 51912351f431SJosef Bacik if (compat) { 51922351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 51932351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 51942351f431SJosef Bacik 51952351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 51962351f431SJosef Bacik if (ret) 51972351f431SJosef Bacik return -EFAULT; 51982351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 51992351f431SJosef Bacik if (!arg) 52002351f431SJosef Bacik return -ENOMEM; 52012351f431SJosef Bacik arg->send_fd = args32.send_fd; 52022351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 52032351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 52042351f431SJosef Bacik arg->parent_root = args32.parent_root; 52052351f431SJosef Bacik arg->flags = args32.flags; 52062351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 52072351f431SJosef Bacik sizeof(args32.reserved)); 52082351f431SJosef Bacik #else 52092351f431SJosef Bacik return -ENOTTY; 52102351f431SJosef Bacik #endif 52112351f431SJosef Bacik } else { 52122351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 52132351f431SJosef Bacik if (IS_ERR(arg)) 52142351f431SJosef Bacik return PTR_ERR(arg); 52152351f431SJosef Bacik } 52169ad12305SSahil Kang ret = btrfs_ioctl_send(inode, arg); 52172351f431SJosef Bacik kfree(arg); 52182351f431SJosef Bacik return ret; 52192351f431SJosef Bacik } 52202351f431SJosef Bacik 52211881fba8SOmar Sandoval static int btrfs_ioctl_encoded_read(struct file *file, void __user *argp, 52221881fba8SOmar Sandoval bool compat) 52231881fba8SOmar Sandoval { 52241881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args args = { 0 }; 52251881fba8SOmar Sandoval size_t copy_end_kernel = offsetofend(struct btrfs_ioctl_encoded_io_args, 52261881fba8SOmar Sandoval flags); 52271881fba8SOmar Sandoval size_t copy_end; 52281881fba8SOmar Sandoval struct iovec iovstack[UIO_FASTIOV]; 52291881fba8SOmar Sandoval struct iovec *iov = iovstack; 52301881fba8SOmar Sandoval struct iov_iter iter; 52311881fba8SOmar Sandoval loff_t pos; 52321881fba8SOmar Sandoval struct kiocb kiocb; 52331881fba8SOmar Sandoval ssize_t ret; 52341881fba8SOmar Sandoval 52351881fba8SOmar Sandoval if (!capable(CAP_SYS_ADMIN)) { 52361881fba8SOmar Sandoval ret = -EPERM; 52371881fba8SOmar Sandoval goto out_acct; 52381881fba8SOmar Sandoval } 52391881fba8SOmar Sandoval 52401881fba8SOmar Sandoval if (compat) { 52411881fba8SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 52421881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 args32; 52431881fba8SOmar Sandoval 52441881fba8SOmar Sandoval copy_end = offsetofend(struct btrfs_ioctl_encoded_io_args_32, 52451881fba8SOmar Sandoval flags); 52461881fba8SOmar Sandoval if (copy_from_user(&args32, argp, copy_end)) { 52471881fba8SOmar Sandoval ret = -EFAULT; 52481881fba8SOmar Sandoval goto out_acct; 52491881fba8SOmar Sandoval } 52501881fba8SOmar Sandoval args.iov = compat_ptr(args32.iov); 52511881fba8SOmar Sandoval args.iovcnt = args32.iovcnt; 52521881fba8SOmar Sandoval args.offset = args32.offset; 52531881fba8SOmar Sandoval args.flags = args32.flags; 52541881fba8SOmar Sandoval #else 52551881fba8SOmar Sandoval return -ENOTTY; 52561881fba8SOmar Sandoval #endif 52571881fba8SOmar Sandoval } else { 52581881fba8SOmar Sandoval copy_end = copy_end_kernel; 52591881fba8SOmar Sandoval if (copy_from_user(&args, argp, copy_end)) { 52601881fba8SOmar Sandoval ret = -EFAULT; 52611881fba8SOmar Sandoval goto out_acct; 52621881fba8SOmar Sandoval } 52631881fba8SOmar Sandoval } 52641881fba8SOmar Sandoval if (args.flags != 0) { 52651881fba8SOmar Sandoval ret = -EINVAL; 52661881fba8SOmar Sandoval goto out_acct; 52671881fba8SOmar Sandoval } 52681881fba8SOmar Sandoval 52691881fba8SOmar Sandoval ret = import_iovec(READ, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), 52701881fba8SOmar Sandoval &iov, &iter); 52711881fba8SOmar Sandoval if (ret < 0) 52721881fba8SOmar Sandoval goto out_acct; 52731881fba8SOmar Sandoval 52741881fba8SOmar Sandoval if (iov_iter_count(&iter) == 0) { 52751881fba8SOmar Sandoval ret = 0; 52761881fba8SOmar Sandoval goto out_iov; 52771881fba8SOmar Sandoval } 52781881fba8SOmar Sandoval pos = args.offset; 52791881fba8SOmar Sandoval ret = rw_verify_area(READ, file, &pos, args.len); 52801881fba8SOmar Sandoval if (ret < 0) 52811881fba8SOmar Sandoval goto out_iov; 52821881fba8SOmar Sandoval 52831881fba8SOmar Sandoval init_sync_kiocb(&kiocb, file); 52841881fba8SOmar Sandoval kiocb.ki_pos = pos; 52851881fba8SOmar Sandoval 52861881fba8SOmar Sandoval ret = btrfs_encoded_read(&kiocb, &iter, &args); 52871881fba8SOmar Sandoval if (ret >= 0) { 52881881fba8SOmar Sandoval fsnotify_access(file); 52891881fba8SOmar Sandoval if (copy_to_user(argp + copy_end, 52901881fba8SOmar Sandoval (char *)&args + copy_end_kernel, 52911881fba8SOmar Sandoval sizeof(args) - copy_end_kernel)) 52921881fba8SOmar Sandoval ret = -EFAULT; 52931881fba8SOmar Sandoval } 52941881fba8SOmar Sandoval 52951881fba8SOmar Sandoval out_iov: 52961881fba8SOmar Sandoval kfree(iov); 52971881fba8SOmar Sandoval out_acct: 52981881fba8SOmar Sandoval if (ret > 0) 52991881fba8SOmar Sandoval add_rchar(current, ret); 53001881fba8SOmar Sandoval inc_syscr(current); 53011881fba8SOmar Sandoval return ret; 53021881fba8SOmar Sandoval } 53031881fba8SOmar Sandoval 53047c0c7269SOmar Sandoval static int btrfs_ioctl_encoded_write(struct file *file, void __user *argp, bool compat) 53057c0c7269SOmar Sandoval { 53067c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args args; 53077c0c7269SOmar Sandoval struct iovec iovstack[UIO_FASTIOV]; 53087c0c7269SOmar Sandoval struct iovec *iov = iovstack; 53097c0c7269SOmar Sandoval struct iov_iter iter; 53107c0c7269SOmar Sandoval loff_t pos; 53117c0c7269SOmar Sandoval struct kiocb kiocb; 53127c0c7269SOmar Sandoval ssize_t ret; 53137c0c7269SOmar Sandoval 53147c0c7269SOmar Sandoval if (!capable(CAP_SYS_ADMIN)) { 53157c0c7269SOmar Sandoval ret = -EPERM; 53167c0c7269SOmar Sandoval goto out_acct; 53177c0c7269SOmar Sandoval } 53187c0c7269SOmar Sandoval 53197c0c7269SOmar Sandoval if (!(file->f_mode & FMODE_WRITE)) { 53207c0c7269SOmar Sandoval ret = -EBADF; 53217c0c7269SOmar Sandoval goto out_acct; 53227c0c7269SOmar Sandoval } 53237c0c7269SOmar Sandoval 53247c0c7269SOmar Sandoval if (compat) { 53257c0c7269SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 53267c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 args32; 53277c0c7269SOmar Sandoval 53287c0c7269SOmar Sandoval if (copy_from_user(&args32, argp, sizeof(args32))) { 53297c0c7269SOmar Sandoval ret = -EFAULT; 53307c0c7269SOmar Sandoval goto out_acct; 53317c0c7269SOmar Sandoval } 53327c0c7269SOmar Sandoval args.iov = compat_ptr(args32.iov); 53337c0c7269SOmar Sandoval args.iovcnt = args32.iovcnt; 53347c0c7269SOmar Sandoval args.offset = args32.offset; 53357c0c7269SOmar Sandoval args.flags = args32.flags; 53367c0c7269SOmar Sandoval args.len = args32.len; 53377c0c7269SOmar Sandoval args.unencoded_len = args32.unencoded_len; 53387c0c7269SOmar Sandoval args.unencoded_offset = args32.unencoded_offset; 53397c0c7269SOmar Sandoval args.compression = args32.compression; 53407c0c7269SOmar Sandoval args.encryption = args32.encryption; 53417c0c7269SOmar Sandoval memcpy(args.reserved, args32.reserved, sizeof(args.reserved)); 53427c0c7269SOmar Sandoval #else 53437c0c7269SOmar Sandoval return -ENOTTY; 53447c0c7269SOmar Sandoval #endif 53457c0c7269SOmar Sandoval } else { 53467c0c7269SOmar Sandoval if (copy_from_user(&args, argp, sizeof(args))) { 53477c0c7269SOmar Sandoval ret = -EFAULT; 53487c0c7269SOmar Sandoval goto out_acct; 53497c0c7269SOmar Sandoval } 53507c0c7269SOmar Sandoval } 53517c0c7269SOmar Sandoval 53527c0c7269SOmar Sandoval ret = -EINVAL; 53537c0c7269SOmar Sandoval if (args.flags != 0) 53547c0c7269SOmar Sandoval goto out_acct; 53557c0c7269SOmar Sandoval if (memchr_inv(args.reserved, 0, sizeof(args.reserved))) 53567c0c7269SOmar Sandoval goto out_acct; 53577c0c7269SOmar Sandoval if (args.compression == BTRFS_ENCODED_IO_COMPRESSION_NONE && 53587c0c7269SOmar Sandoval args.encryption == BTRFS_ENCODED_IO_ENCRYPTION_NONE) 53597c0c7269SOmar Sandoval goto out_acct; 53607c0c7269SOmar Sandoval if (args.compression >= BTRFS_ENCODED_IO_COMPRESSION_TYPES || 53617c0c7269SOmar Sandoval args.encryption >= BTRFS_ENCODED_IO_ENCRYPTION_TYPES) 53627c0c7269SOmar Sandoval goto out_acct; 53637c0c7269SOmar Sandoval if (args.unencoded_offset > args.unencoded_len) 53647c0c7269SOmar Sandoval goto out_acct; 53657c0c7269SOmar Sandoval if (args.len > args.unencoded_len - args.unencoded_offset) 53667c0c7269SOmar Sandoval goto out_acct; 53677c0c7269SOmar Sandoval 53687c0c7269SOmar Sandoval ret = import_iovec(WRITE, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), 53697c0c7269SOmar Sandoval &iov, &iter); 53707c0c7269SOmar Sandoval if (ret < 0) 53717c0c7269SOmar Sandoval goto out_acct; 53727c0c7269SOmar Sandoval 53737c0c7269SOmar Sandoval file_start_write(file); 53747c0c7269SOmar Sandoval 53757c0c7269SOmar Sandoval if (iov_iter_count(&iter) == 0) { 53767c0c7269SOmar Sandoval ret = 0; 53777c0c7269SOmar Sandoval goto out_end_write; 53787c0c7269SOmar Sandoval } 53797c0c7269SOmar Sandoval pos = args.offset; 53807c0c7269SOmar Sandoval ret = rw_verify_area(WRITE, file, &pos, args.len); 53817c0c7269SOmar Sandoval if (ret < 0) 53827c0c7269SOmar Sandoval goto out_end_write; 53837c0c7269SOmar Sandoval 53847c0c7269SOmar Sandoval init_sync_kiocb(&kiocb, file); 53857c0c7269SOmar Sandoval ret = kiocb_set_rw_flags(&kiocb, 0); 53867c0c7269SOmar Sandoval if (ret) 53877c0c7269SOmar Sandoval goto out_end_write; 53887c0c7269SOmar Sandoval kiocb.ki_pos = pos; 53897c0c7269SOmar Sandoval 53907c0c7269SOmar Sandoval ret = btrfs_do_write_iter(&kiocb, &iter, &args); 53917c0c7269SOmar Sandoval if (ret > 0) 53927c0c7269SOmar Sandoval fsnotify_modify(file); 53937c0c7269SOmar Sandoval 53947c0c7269SOmar Sandoval out_end_write: 53957c0c7269SOmar Sandoval file_end_write(file); 53967c0c7269SOmar Sandoval kfree(iov); 53977c0c7269SOmar Sandoval out_acct: 53987c0c7269SOmar Sandoval if (ret > 0) 53997c0c7269SOmar Sandoval add_wchar(current, ret); 54007c0c7269SOmar Sandoval inc_syscw(current); 54017c0c7269SOmar Sandoval return ret; 54027c0c7269SOmar Sandoval } 54037c0c7269SOmar Sandoval 5404f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 5405f46b5a66SChristoph Hellwig cmd, unsigned long arg) 5406f46b5a66SChristoph Hellwig { 54070b246afaSJeff Mahoney struct inode *inode = file_inode(file); 54080b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 54090b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 54104bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 5411f46b5a66SChristoph Hellwig 5412f46b5a66SChristoph Hellwig switch (cmd) { 54136cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 5414dc408ccdSSahil Kang return btrfs_ioctl_getversion(inode, argp); 541540cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 5416b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 541740cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 541840cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 5419f7039b1dSLi Dongyang case FITRIM: 5420b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 5421f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 5422fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 5423fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 5424fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 54253de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 5426fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 54276f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 54286f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 542976dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 5430949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 5431949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 5432949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 54330caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 54349ad12305SSahil Kang return btrfs_ioctl_subvol_getflags(inode, argp); 54350caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 54360caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 54376ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 54386ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 5439f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 54401e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 54411e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 54421e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 5443f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 5444198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 5445f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 54462ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 5447f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 5448da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 54496b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 54506b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 5451475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 54522ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 5453475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 54542ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 5455ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 54569ad12305SSahil Kang return btrfs_ioctl_tree_search(inode, argp); 5457cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 54589ad12305SSahil Kang return btrfs_ioctl_tree_search_v2(inode, argp); 5459ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 5460dc408ccdSSahil Kang return btrfs_ioctl_ino_lookup(root, argp); 5461d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 5462d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 5463d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 5464d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 5465d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 5466d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 54671406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 54682ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 54699b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 54709b199859SFilipe David Borba Manana int ret; 54719b199859SFilipe David Borba Manana 54729db4dc24SNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 54739b199859SFilipe David Borba Manana if (ret) 54749b199859SFilipe David Borba Manana return ret; 54750b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 54762fad4e83SDavid Sterba /* 54772fad4e83SDavid Sterba * The transaction thread may want to do more work, 547801327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 54792fad4e83SDavid Sterba * processing uncleaned subvols. 54802fad4e83SDavid Sterba */ 54810b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 54829b199859SFilipe David Borba Manana return ret; 54839b199859SFilipe David Borba Manana } 548446204592SSage Weil case BTRFS_IOC_START_SYNC: 54859a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 548646204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 54872ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 5488475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 5489b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 5490475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 54912ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 5492475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 54932ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 5494c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 54959ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 5496837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 54972ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 549819a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 54992ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 55008ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 55018ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 5502abccd00fSHugo Mills #ifdef CONFIG_64BIT 5503abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 5504abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 5505abccd00fSHugo Mills #endif 550631db9f7cSAlexander Block case BTRFS_IOC_SEND: 55079ad12305SSahil Kang return _btrfs_ioctl_send(inode, argp, false); 55082351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 55092351f431SJosef Bacik case BTRFS_IOC_SEND_32: 55109ad12305SSahil Kang return _btrfs_ioctl_send(inode, argp, true); 55112351f431SJosef Bacik #endif 5512c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 55132ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 55145d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5515905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 55165d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5517905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 55185d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5519905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 55205d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5521905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 55222f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 55232f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 55242f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 5525b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 552657254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 5527b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 55283f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 55292ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 55302eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 5531d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 55322eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 5533b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 55342eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 55352eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5536b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 55379ad12305SSahil Kang return btrfs_ioctl_get_subvol_info(inode, argp); 553842e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 5539dc408ccdSSahil Kang return btrfs_ioctl_get_subvol_rootref(root, argp); 554023d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 554123d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 554214605409SBoris Burkov case FS_IOC_ENABLE_VERITY: 554314605409SBoris Burkov return fsverity_ioctl_enable(file, (const void __user *)argp); 554414605409SBoris Burkov case FS_IOC_MEASURE_VERITY: 554514605409SBoris Burkov return fsverity_ioctl_measure(file, argp); 55461881fba8SOmar Sandoval case BTRFS_IOC_ENCODED_READ: 55471881fba8SOmar Sandoval return btrfs_ioctl_encoded_read(file, argp, false); 55487c0c7269SOmar Sandoval case BTRFS_IOC_ENCODED_WRITE: 55497c0c7269SOmar Sandoval return btrfs_ioctl_encoded_write(file, argp, false); 55501881fba8SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 55511881fba8SOmar Sandoval case BTRFS_IOC_ENCODED_READ_32: 55521881fba8SOmar Sandoval return btrfs_ioctl_encoded_read(file, argp, true); 55537c0c7269SOmar Sandoval case BTRFS_IOC_ENCODED_WRITE_32: 55547c0c7269SOmar Sandoval return btrfs_ioctl_encoded_write(file, argp, true); 55551881fba8SOmar Sandoval #endif 5556f46b5a66SChristoph Hellwig } 5557f46b5a66SChristoph Hellwig 5558f46b5a66SChristoph Hellwig return -ENOTTY; 5559f46b5a66SChristoph Hellwig } 55604c63c245SLuke Dashjr 55614c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 55624c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 55634c63c245SLuke Dashjr { 55642a362249SJeff Mahoney /* 55652a362249SJeff Mahoney * These all access 32-bit values anyway so no further 55662a362249SJeff Mahoney * handling is necessary. 55672a362249SJeff Mahoney */ 55684c63c245SLuke Dashjr switch (cmd) { 55694c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 55704c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 55714c63c245SLuke Dashjr break; 55724c63c245SLuke Dashjr } 55734c63c245SLuke Dashjr 55744c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 55754c63c245SLuke Dashjr } 55764c63c245SLuke Dashjr #endif 5577