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) 108*7c0c7269SOmar Sandoval #define BTRFS_IOC_ENCODED_WRITE_32 _IOW(BTRFS_IOCTL_MAGIC, 64, \ 109*7c0c7269SOmar 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 request_queue *q; 472f7039b1dSLi Dongyang struct fstrim_range range; 473f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 474f7039b1dSLi Dongyang u64 num_devices = 0; 475f7039b1dSLi Dongyang int ret; 476f7039b1dSLi Dongyang 477f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 478f7039b1dSLi Dongyang return -EPERM; 479f7039b1dSLi Dongyang 480f35f06c3SFilipe Manana /* 4811cb3dc3fSNaohiro Aota * btrfs_trim_block_group() depends on space cache, which is not 4821cb3dc3fSNaohiro Aota * available in zoned filesystem. So, disallow fitrim on a zoned 4831cb3dc3fSNaohiro Aota * filesystem for now. 4841cb3dc3fSNaohiro Aota */ 4851cb3dc3fSNaohiro Aota if (btrfs_is_zoned(fs_info)) 4861cb3dc3fSNaohiro Aota return -EOPNOTSUPP; 4871cb3dc3fSNaohiro Aota 4881cb3dc3fSNaohiro Aota /* 489f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 490f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 491f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 492f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 493f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 494f35f06c3SFilipe Manana */ 495f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 496f35f06c3SFilipe Manana return -EROFS; 497f35f06c3SFilipe Manana 4981f78160cSXiao Guangrong rcu_read_lock(); 4991f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 5001f78160cSXiao Guangrong dev_list) { 501f7039b1dSLi Dongyang if (!device->bdev) 502f7039b1dSLi Dongyang continue; 503f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 504f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 505f7039b1dSLi Dongyang num_devices++; 50650d0446eSSeraphime Kirkovski minlen = min_t(u64, q->limits.discard_granularity, 507f7039b1dSLi Dongyang minlen); 508f7039b1dSLi Dongyang } 509f7039b1dSLi Dongyang } 5101f78160cSXiao Guangrong rcu_read_unlock(); 511f4c697e6SLukas Czerner 512f7039b1dSLi Dongyang if (!num_devices) 513f7039b1dSLi Dongyang return -EOPNOTSUPP; 514f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 515f7039b1dSLi Dongyang return -EFAULT; 5166ba9fc8eSQu Wenruo 5176ba9fc8eSQu Wenruo /* 5186ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 5196ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 5206ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 5216ba9fc8eSQu Wenruo */ 5226ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 523f4c697e6SLukas Czerner return -EINVAL; 524f7039b1dSLi Dongyang 525f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 5262ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 527f7039b1dSLi Dongyang if (ret < 0) 528f7039b1dSLi Dongyang return ret; 529f7039b1dSLi Dongyang 530f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 531f7039b1dSLi Dongyang return -EFAULT; 532f7039b1dSLi Dongyang 533f7039b1dSLi Dongyang return 0; 534f7039b1dSLi Dongyang } 535f7039b1dSLi Dongyang 536e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 537dd5f9615SStefan Behrens { 53846e0f66aSChris Mason int i; 53946e0f66aSChris Mason 54046e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 54146e0f66aSChris Mason if (uuid[i]) 54246e0f66aSChris Mason return 0; 54346e0f66aSChris Mason } 54446e0f66aSChris Mason return 1; 545dd5f9615SStefan Behrens } 546dd5f9615SStefan Behrens 5474d4340c9SChristian Brauner static noinline int create_subvol(struct user_namespace *mnt_userns, 5484d4340c9SChristian Brauner struct inode *dir, struct dentry *dentry, 54952f75f4fSDavid Sterba const char *name, int namelen, 5508696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 551f46b5a66SChristoph Hellwig { 5520b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 553f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 554f46b5a66SChristoph Hellwig struct btrfs_key key; 55549a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 556f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 557f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 558d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 55976dda93cSYan, Zheng struct btrfs_root *new_root; 560d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 56195582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 5625662344bSTsutomu Itoh struct inode *inode; 563f46b5a66SChristoph Hellwig int ret; 5642dfb1e43SQu Wenruo dev_t anon_dev = 0; 565f46b5a66SChristoph Hellwig u64 objectid; 5663de4586cSChris Mason u64 index = 0; 567f46b5a66SChristoph Hellwig 56849a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 56949a3c4d9SDavid Sterba if (!root_item) 57049a3c4d9SDavid Sterba return -ENOMEM; 57149a3c4d9SDavid Sterba 572543068a2SNikolay Borisov ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); 5732fbe8c8aSAl Viro if (ret) 57449a3c4d9SDavid Sterba goto fail_free; 5756a912213SJosef Bacik 5762dfb1e43SQu Wenruo ret = get_anon_bdev(&anon_dev); 5772dfb1e43SQu Wenruo if (ret < 0) 5782dfb1e43SQu Wenruo goto fail_free; 5792dfb1e43SQu Wenruo 580e09fe2d2SQu Wenruo /* 581e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 58201327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 583e09fe2d2SQu Wenruo */ 58449a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 58549a3c4d9SDavid Sterba ret = -ENOSPC; 58649a3c4d9SDavid Sterba goto fail_free; 58749a3c4d9SDavid Sterba } 588e09fe2d2SQu Wenruo 589d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 5909ed74f2dSJosef Bacik /* 591d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 592d5c12070SMiao Xie * of create_snapshot(). 5939ed74f2dSJosef Bacik */ 594c4c129dbSGu JinXiang ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false); 595d5c12070SMiao Xie if (ret) 59649a3c4d9SDavid Sterba goto fail_free; 597f46b5a66SChristoph Hellwig 598d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 599d5c12070SMiao Xie if (IS_ERR(trans)) { 600d5c12070SMiao Xie ret = PTR_ERR(trans); 601e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 60249a3c4d9SDavid Sterba goto fail_free; 603d5c12070SMiao Xie } 604d5c12070SMiao Xie trans->block_rsv = &block_rsv; 605d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 606f46b5a66SChristoph Hellwig 607a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 6086f72c7e2SArne Jansen if (ret) 6096f72c7e2SArne Jansen goto fail; 6106f72c7e2SArne Jansen 6119631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 6129631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 6138e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 6148e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 6158e8a1e31SJosef Bacik goto fail; 6168e8a1e31SJosef Bacik } 617f46b5a66SChristoph Hellwig 618f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 619f46b5a66SChristoph Hellwig 62049a3c4d9SDavid Sterba inode_item = &root_item->inode; 6213cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6223cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6233cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 624da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6250b246afaSJeff Mahoney fs_info->nodesize); 6263cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 627f46b5a66SChristoph Hellwig 62849a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 62949a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6303cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 63108fe4db1SLi Zefan 63249a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 63349a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 63449a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 63549a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 63649a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 63749a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 638f46b5a66SChristoph Hellwig 63949a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 64049a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 641807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 64249a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 64349a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 64449a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 64549a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 64649a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 647f46b5a66SChristoph Hellwig 648925baeddSChris Mason btrfs_tree_unlock(leaf); 649f46b5a66SChristoph Hellwig 65069948022SNikolay Borisov btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); 651f46b5a66SChristoph Hellwig 652f46b5a66SChristoph Hellwig key.objectid = objectid; 6535d4f98a2SYan Zheng key.offset = 0; 654962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 6550b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 65649a3c4d9SDavid Sterba root_item); 65767addf29SFilipe Manana if (ret) { 65867addf29SFilipe Manana /* 65967addf29SFilipe Manana * Since we don't abort the transaction in this case, free the 66067addf29SFilipe Manana * tree block so that we don't leak space and leave the 66167addf29SFilipe Manana * filesystem in an inconsistent state (an extent item in the 6627a163608SFilipe Manana * extent tree with a backreference for a root that does not 663212a58fdSFilipe Manana * exists). 66467addf29SFilipe Manana */ 665212a58fdSFilipe Manana btrfs_tree_lock(leaf); 666212a58fdSFilipe Manana btrfs_clean_tree_block(leaf); 667212a58fdSFilipe Manana btrfs_tree_unlock(leaf); 6687a163608SFilipe Manana btrfs_free_tree_block(trans, objectid, leaf, 0, 1); 66967addf29SFilipe Manana free_extent_buffer(leaf); 670f46b5a66SChristoph Hellwig goto fail; 67167addf29SFilipe Manana } 67267addf29SFilipe Manana 67367addf29SFilipe Manana free_extent_buffer(leaf); 67467addf29SFilipe Manana leaf = NULL; 675f46b5a66SChristoph Hellwig 67676dda93cSYan, Zheng key.offset = (u64)-1; 6772dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 67879787eaaSJeff Mahoney if (IS_ERR(new_root)) { 6792dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 68079787eaaSJeff Mahoney ret = PTR_ERR(new_root); 68166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 68279787eaaSJeff Mahoney goto fail; 68379787eaaSJeff Mahoney } 6842dfb1e43SQu Wenruo /* Freeing will be done in btrfs_put_root() of new_root */ 6852dfb1e43SQu Wenruo anon_dev = 0; 68676dda93cSYan, Zheng 687221581e4SJosef Bacik ret = btrfs_record_root_in_trans(trans, new_root); 688221581e4SJosef Bacik if (ret) { 689221581e4SJosef Bacik btrfs_put_root(new_root); 690221581e4SJosef Bacik btrfs_abort_transaction(trans, ret); 691221581e4SJosef Bacik goto fail; 692221581e4SJosef Bacik } 69376dda93cSYan, Zheng 6944d4340c9SChristian Brauner ret = btrfs_create_subvol_root(trans, new_root, root, mnt_userns); 69500246528SJosef Bacik btrfs_put_root(new_root); 696ce598979SMark Fasheh if (ret) { 697ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 69866642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 699ce598979SMark Fasheh goto fail; 700ce598979SMark Fasheh } 701ce598979SMark Fasheh 702f46b5a66SChristoph Hellwig /* 703f46b5a66SChristoph Hellwig * insert the directory item 704f46b5a66SChristoph Hellwig */ 705877574e2SNikolay Borisov ret = btrfs_set_inode_index(BTRFS_I(dir), &index); 70679787eaaSJeff Mahoney if (ret) { 70766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 70879787eaaSJeff Mahoney goto fail; 70979787eaaSJeff Mahoney } 7103de4586cSChris Mason 711684572dfSLu Fengqi ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key, 7123de4586cSChris Mason BTRFS_FT_DIR, index); 71379787eaaSJeff Mahoney if (ret) { 71466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 715f46b5a66SChristoph Hellwig goto fail; 71679787eaaSJeff Mahoney } 7170660b5afSChris Mason 7186ef06d27SNikolay Borisov btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); 7199a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(dir)); 720c7e54b51SJosef Bacik if (ret) { 721c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 722c7e54b51SJosef Bacik goto fail; 723c7e54b51SJosef Bacik } 72452c26179SYan Zheng 7256025c19fSLu Fengqi ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid, 7264a0cc7caSNikolay Borisov btrfs_ino(BTRFS_I(dir)), index, name, namelen); 727c7e54b51SJosef Bacik if (ret) { 728c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 729c7e54b51SJosef Bacik goto fail; 730c7e54b51SJosef Bacik } 7310660b5afSChris Mason 732cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7336bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 734dd5f9615SStefan Behrens if (ret) 73566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 736dd5f9615SStefan Behrens 737f46b5a66SChristoph Hellwig fail: 73849a3c4d9SDavid Sterba kfree(root_item); 739d5c12070SMiao Xie trans->block_rsv = NULL; 740d5c12070SMiao Xie trans->bytes_reserved = 0; 741e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 742de6e8200SLiu Bo 7431b58ae0eSFilipe Manana if (ret) 7441b58ae0eSFilipe Manana btrfs_end_transaction(trans); 7451b58ae0eSFilipe Manana else 7461b58ae0eSFilipe Manana ret = btrfs_commit_transaction(trans); 7471a65e24bSChris Mason 7485662344bSTsutomu Itoh if (!ret) { 7495662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 750de6e8200SLiu Bo if (IS_ERR(inode)) 751de6e8200SLiu Bo return PTR_ERR(inode); 7525662344bSTsutomu Itoh d_instantiate(dentry, inode); 7535662344bSTsutomu Itoh } 754f46b5a66SChristoph Hellwig return ret; 75549a3c4d9SDavid Sterba 75649a3c4d9SDavid Sterba fail_free: 7572dfb1e43SQu Wenruo if (anon_dev) 7582dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 75949a3c4d9SDavid Sterba kfree(root_item); 76049a3c4d9SDavid Sterba return ret; 761f46b5a66SChristoph Hellwig } 762f46b5a66SChristoph Hellwig 763e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7649babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 765e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 766f46b5a66SChristoph Hellwig { 7670b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7682e4bfab9SYan, Zheng struct inode *inode; 769f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 770f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7712e4bfab9SYan, Zheng int ret; 772f46b5a66SChristoph Hellwig 773813febdbSJosef Bacik /* We do not support snapshotting right now. */ 774813febdbSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 775813febdbSJosef Bacik btrfs_warn(fs_info, 776813febdbSJosef Bacik "extent tree v2 doesn't support snapshotting yet"); 777813febdbSJosef Bacik return -EOPNOTSUPP; 778813febdbSJosef Bacik } 779813febdbSJosef Bacik 78092a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 781f46b5a66SChristoph Hellwig return -EINVAL; 782f46b5a66SChristoph Hellwig 783eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 784eede2bf3SOmar Sandoval btrfs_warn(fs_info, 785eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 786eede2bf3SOmar Sandoval return -ETXTBSY; 787eede2bf3SOmar Sandoval } 788eede2bf3SOmar Sandoval 78923269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 790a1ee7362SDavid Sterba if (!pending_snapshot) 791a1ee7362SDavid Sterba return -ENOMEM; 792a1ee7362SDavid Sterba 7932dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 7942dfb1e43SQu Wenruo if (ret < 0) 7952dfb1e43SQu Wenruo goto free_pending; 796b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 79723269bf5SDavid Sterba GFP_KERNEL); 7988546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 7998546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 800b0c0ea63SDavid Sterba ret = -ENOMEM; 801b0c0ea63SDavid Sterba goto free_pending; 802b0c0ea63SDavid Sterba } 803b0c0ea63SDavid Sterba 80466d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 80566d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 806d5c12070SMiao Xie /* 807d5c12070SMiao Xie * 1 - parent dir inode 808d5c12070SMiao Xie * 2 - dir entries 809d5c12070SMiao Xie * 1 - root item 810d5c12070SMiao Xie * 2 - root ref/backref 811d5c12070SMiao Xie * 1 - root of snapshot 812dd5f9615SStefan Behrens * 1 - UUID item 813d5c12070SMiao Xie */ 814d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 815dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 816ee3441b4SJeff Mahoney false); 817d5c12070SMiao Xie if (ret) 818c11fbb6eSRobbie Ko goto free_pending; 819d5c12070SMiao Xie 820a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 821a22285a6SYan, Zheng pending_snapshot->root = root; 822b83cc969SLi Zefan pending_snapshot->readonly = readonly; 823e9662f70SMiao Xie pending_snapshot->dir = dir; 8248696c533SMiao Xie pending_snapshot->inherit = inherit; 825a22285a6SYan, Zheng 826d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 827a22285a6SYan, Zheng if (IS_ERR(trans)) { 828a22285a6SYan, Zheng ret = PTR_ERR(trans); 829a22285a6SYan, Zheng goto fail; 830a22285a6SYan, Zheng } 831a22285a6SYan, Zheng 83228b21c55SFilipe Manana trans->pending_snapshot = pending_snapshot; 8339babda9fSNikolay Borisov 8343a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 835aec8030aSMiao Xie if (ret) 836c37b2b62SJosef Bacik goto fail; 837a22285a6SYan, Zheng 838a22285a6SYan, Zheng ret = pending_snapshot->error; 839f46b5a66SChristoph Hellwig if (ret) 8402e4bfab9SYan, Zheng goto fail; 841f46b5a66SChristoph Hellwig 842d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 843d3797308SChris Mason if (ret) 844d3797308SChris Mason goto fail; 845d3797308SChris Mason 8462b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8472e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8482e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8492e4bfab9SYan, Zheng goto fail; 8502e4bfab9SYan, Zheng } 8515662344bSTsutomu Itoh 8522e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8532e4bfab9SYan, Zheng ret = 0; 8542dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8552e4bfab9SYan, Zheng fail: 8562dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 8572dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8582dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 85900246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 860e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 861b0c0ea63SDavid Sterba free_pending: 8622dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8632dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 864b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8658546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 866a1ee7362SDavid Sterba kfree(pending_snapshot); 867a1ee7362SDavid Sterba 868f46b5a66SChristoph Hellwig return ret; 869f46b5a66SChristoph Hellwig } 870f46b5a66SChristoph Hellwig 8714260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8724260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8734260f7c7SSage Weil * whether the type of victim is right. 8744260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8754260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8764260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8774260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8784260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8794260f7c7SSage Weil * a. be owner of dir, or 8804260f7c7SSage Weil * b. be owner of victim, or 8814260f7c7SSage Weil * c. have CAP_FOWNER capability 88201327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 8834260f7c7SSage Weil * links pointing to it. 8844260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8854260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 8864260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 8874260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 8884260f7c7SSage Weil * nfs_async_unlink(). 8894260f7c7SSage Weil */ 8904260f7c7SSage Weil 891c4ed533bSChristian Brauner static int btrfs_may_delete(struct user_namespace *mnt_userns, 892c4ed533bSChristian Brauner struct inode *dir, struct dentry *victim, int isdir) 8934260f7c7SSage Weil { 8944260f7c7SSage Weil int error; 8954260f7c7SSage Weil 8962b0143b5SDavid Howells if (d_really_is_negative(victim)) 8974260f7c7SSage Weil return -ENOENT; 8984260f7c7SSage Weil 8992b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 9004fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 9014260f7c7SSage Weil 902c4ed533bSChristian Brauner error = inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); 9034260f7c7SSage Weil if (error) 9044260f7c7SSage Weil return error; 9054260f7c7SSage Weil if (IS_APPEND(dir)) 9064260f7c7SSage Weil return -EPERM; 907c4ed533bSChristian Brauner if (check_sticky(mnt_userns, dir, d_inode(victim)) || 908ba73d987SChristian Brauner IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) || 909ba73d987SChristian Brauner IS_SWAPFILE(d_inode(victim))) 9104260f7c7SSage Weil return -EPERM; 9114260f7c7SSage Weil if (isdir) { 912e36cb0b8SDavid Howells if (!d_is_dir(victim)) 9134260f7c7SSage Weil return -ENOTDIR; 9144260f7c7SSage Weil if (IS_ROOT(victim)) 9154260f7c7SSage Weil return -EBUSY; 916e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 9174260f7c7SSage Weil return -EISDIR; 9184260f7c7SSage Weil if (IS_DEADDIR(dir)) 9194260f7c7SSage Weil return -ENOENT; 9204260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 9214260f7c7SSage Weil return -EBUSY; 9224260f7c7SSage Weil return 0; 9234260f7c7SSage Weil } 9244260f7c7SSage Weil 925cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 9264d4340c9SChristian Brauner static inline int btrfs_may_create(struct user_namespace *mnt_userns, 9274d4340c9SChristian Brauner struct inode *dir, struct dentry *child) 928cb8e7090SChristoph Hellwig { 9292b0143b5SDavid Howells if (d_really_is_positive(child)) 930cb8e7090SChristoph Hellwig return -EEXIST; 931cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 932cb8e7090SChristoph Hellwig return -ENOENT; 9334d4340c9SChristian Brauner if (!fsuidgid_has_mapping(dir->i_sb, mnt_userns)) 9345474bf40SChristian Brauner return -EOVERFLOW; 9354d4340c9SChristian Brauner return inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); 936cb8e7090SChristoph Hellwig } 937cb8e7090SChristoph Hellwig 938cb8e7090SChristoph Hellwig /* 939cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 940cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 941cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 942cb8e7090SChristoph Hellwig */ 94392872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 9444d4340c9SChristian Brauner struct user_namespace *mnt_userns, 94552f75f4fSDavid Sterba const char *name, int namelen, 94672fd032eSSage Weil struct btrfs_root *snap_src, 9479babda9fSNikolay Borisov bool readonly, 9488696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 949cb8e7090SChristoph Hellwig { 9502b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9510b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 952cb8e7090SChristoph Hellwig struct dentry *dentry; 953cb8e7090SChristoph Hellwig int error; 954cb8e7090SChristoph Hellwig 95500235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 95600235411SAl Viro if (error == -EINTR) 95700235411SAl Viro return error; 958cb8e7090SChristoph Hellwig 9594d4340c9SChristian Brauner dentry = lookup_one(mnt_userns, name, parent->dentry, namelen); 960cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 961cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 962cb8e7090SChristoph Hellwig goto out_unlock; 963cb8e7090SChristoph Hellwig 9644d4340c9SChristian Brauner error = btrfs_may_create(mnt_userns, dir, dentry); 965cb8e7090SChristoph Hellwig if (error) 966a874a63eSLiu Bo goto out_dput; 967cb8e7090SChristoph Hellwig 9689c52057cSChris Mason /* 9699c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9709c52057cSChris Mason * check for them now when we can safely fail 9719c52057cSChris Mason */ 9729c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 9739c52057cSChris Mason dir->i_ino, name, 9749c52057cSChris Mason namelen); 9759c52057cSChris Mason if (error) 9769c52057cSChris Mason goto out_dput; 9779c52057cSChris Mason 9780b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 97976dda93cSYan, Zheng 98076dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 98176dda93cSYan, Zheng goto out_up_read; 98276dda93cSYan, Zheng 9839babda9fSNikolay Borisov if (snap_src) 9849babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 9859babda9fSNikolay Borisov else 9864d4340c9SChristian Brauner error = create_subvol(mnt_userns, dir, dentry, name, namelen, inherit); 9879babda9fSNikolay Borisov 98876dda93cSYan, Zheng if (!error) 98976dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 99076dda93cSYan, Zheng out_up_read: 9910b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 992cb8e7090SChristoph Hellwig out_dput: 993cb8e7090SChristoph Hellwig dput(dentry); 994cb8e7090SChristoph Hellwig out_unlock: 99564708539SJosef Bacik btrfs_inode_unlock(dir, 0); 996cb8e7090SChristoph Hellwig return error; 997cb8e7090SChristoph Hellwig } 998cb8e7090SChristoph Hellwig 999c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 10004d4340c9SChristian Brauner struct user_namespace *mnt_userns, 1001c11fbb6eSRobbie Ko const char *name, int namelen, 1002c11fbb6eSRobbie Ko struct btrfs_root *root, 1003c11fbb6eSRobbie Ko bool readonly, 1004c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 1005c11fbb6eSRobbie Ko { 1006c11fbb6eSRobbie Ko int ret; 1007c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 1008c11fbb6eSRobbie Ko 1009c11fbb6eSRobbie Ko /* 1010c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 1011c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 1012c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 1013c11fbb6eSRobbie Ko */ 1014c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 1015c11fbb6eSRobbie Ko 1016f9baa501SFilipe Manana ret = btrfs_start_delalloc_snapshot(root, false); 1017c11fbb6eSRobbie Ko if (ret) 1018c11fbb6eSRobbie Ko goto out; 1019c11fbb6eSRobbie Ko 1020c11fbb6eSRobbie Ko /* 1021c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 1022c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 1023c11fbb6eSRobbie Ko * creation. 1024c11fbb6eSRobbie Ko */ 1025c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 1026c11fbb6eSRobbie Ko snapshot_force_cow = true; 1027c11fbb6eSRobbie Ko 1028c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 1029c11fbb6eSRobbie Ko 10304d4340c9SChristian Brauner ret = btrfs_mksubvol(parent, mnt_userns, name, namelen, 1031c11fbb6eSRobbie Ko root, readonly, inherit); 1032c11fbb6eSRobbie Ko out: 1033c11fbb6eSRobbie Ko if (snapshot_force_cow) 1034c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 1035c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 1036c11fbb6eSRobbie Ko return ret; 1037c11fbb6eSRobbie Ko } 1038c11fbb6eSRobbie Ko 1039d5633b0dSQu Wenruo /* 1040d5633b0dSQu Wenruo * Defrag specific helper to get an extent map. 1041d5633b0dSQu Wenruo * 1042d5633b0dSQu Wenruo * Differences between this and btrfs_get_extent() are: 1043d5633b0dSQu Wenruo * 1044d5633b0dSQu Wenruo * - No extent_map will be added to inode->extent_tree 1045d5633b0dSQu Wenruo * To reduce memory usage in the long run. 1046d5633b0dSQu Wenruo * 1047d5633b0dSQu Wenruo * - Extra optimization to skip file extents older than @newer_than 1048d5633b0dSQu Wenruo * By using btrfs_search_forward() we can skip entire file ranges that 1049d5633b0dSQu Wenruo * have extents created in past transactions, because btrfs_search_forward() 1050d5633b0dSQu Wenruo * will not visit leaves and nodes with a generation smaller than given 1051d5633b0dSQu Wenruo * minimal generation threshold (@newer_than). 1052d5633b0dSQu Wenruo * 1053d5633b0dSQu Wenruo * Return valid em if we find a file extent matching the requirement. 1054d5633b0dSQu Wenruo * Return NULL if we can not find a file extent matching the requirement. 1055d5633b0dSQu Wenruo * 1056d5633b0dSQu Wenruo * Return ERR_PTR() for error. 1057d5633b0dSQu Wenruo */ 1058d5633b0dSQu Wenruo static struct extent_map *defrag_get_extent(struct btrfs_inode *inode, 1059d5633b0dSQu Wenruo u64 start, u64 newer_than) 1060d5633b0dSQu Wenruo { 1061d5633b0dSQu Wenruo struct btrfs_root *root = inode->root; 1062d5633b0dSQu Wenruo struct btrfs_file_extent_item *fi; 1063d5633b0dSQu Wenruo struct btrfs_path path = { 0 }; 1064d5633b0dSQu Wenruo struct extent_map *em; 1065d5633b0dSQu Wenruo struct btrfs_key key; 1066d5633b0dSQu Wenruo u64 ino = btrfs_ino(inode); 1067d5633b0dSQu Wenruo int ret; 1068d5633b0dSQu Wenruo 1069d5633b0dSQu Wenruo em = alloc_extent_map(); 1070d5633b0dSQu Wenruo if (!em) { 1071d5633b0dSQu Wenruo ret = -ENOMEM; 1072d5633b0dSQu Wenruo goto err; 1073d5633b0dSQu Wenruo } 1074d5633b0dSQu Wenruo 1075d5633b0dSQu Wenruo key.objectid = ino; 1076d5633b0dSQu Wenruo key.type = BTRFS_EXTENT_DATA_KEY; 1077d5633b0dSQu Wenruo key.offset = start; 1078d5633b0dSQu Wenruo 1079d5633b0dSQu Wenruo if (newer_than) { 1080d5633b0dSQu Wenruo ret = btrfs_search_forward(root, &key, &path, newer_than); 1081d5633b0dSQu Wenruo if (ret < 0) 1082d5633b0dSQu Wenruo goto err; 1083d5633b0dSQu Wenruo /* Can't find anything newer */ 1084d5633b0dSQu Wenruo if (ret > 0) 1085d5633b0dSQu Wenruo goto not_found; 1086d5633b0dSQu Wenruo } else { 1087d5633b0dSQu Wenruo ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); 1088d5633b0dSQu Wenruo if (ret < 0) 1089d5633b0dSQu Wenruo goto err; 1090d5633b0dSQu Wenruo } 1091d5633b0dSQu Wenruo if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) { 1092d5633b0dSQu Wenruo /* 1093d5633b0dSQu Wenruo * If btrfs_search_slot() makes path to point beyond nritems, 1094d5633b0dSQu Wenruo * we should not have an empty leaf, as this inode must at 1095d5633b0dSQu Wenruo * least have its INODE_ITEM. 1096d5633b0dSQu Wenruo */ 1097d5633b0dSQu Wenruo ASSERT(btrfs_header_nritems(path.nodes[0])); 1098d5633b0dSQu Wenruo path.slots[0] = btrfs_header_nritems(path.nodes[0]) - 1; 1099d5633b0dSQu Wenruo } 1100d5633b0dSQu Wenruo btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); 1101d5633b0dSQu Wenruo /* Perfect match, no need to go one slot back */ 1102d5633b0dSQu Wenruo if (key.objectid == ino && key.type == BTRFS_EXTENT_DATA_KEY && 1103d5633b0dSQu Wenruo key.offset == start) 1104d5633b0dSQu Wenruo goto iterate; 1105d5633b0dSQu Wenruo 1106d5633b0dSQu Wenruo /* We didn't find a perfect match, needs to go one slot back */ 1107d5633b0dSQu Wenruo if (path.slots[0] > 0) { 1108d5633b0dSQu Wenruo btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); 1109d5633b0dSQu Wenruo if (key.objectid == ino && key.type == BTRFS_EXTENT_DATA_KEY) 1110d5633b0dSQu Wenruo path.slots[0]--; 1111d5633b0dSQu Wenruo } 1112d5633b0dSQu Wenruo 1113d5633b0dSQu Wenruo iterate: 1114d5633b0dSQu Wenruo /* Iterate through the path to find a file extent covering @start */ 1115d5633b0dSQu Wenruo while (true) { 1116d5633b0dSQu Wenruo u64 extent_end; 1117d5633b0dSQu Wenruo 1118d5633b0dSQu Wenruo if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) 1119d5633b0dSQu Wenruo goto next; 1120d5633b0dSQu Wenruo 1121d5633b0dSQu Wenruo btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); 1122d5633b0dSQu Wenruo 1123d5633b0dSQu Wenruo /* 1124d5633b0dSQu Wenruo * We may go one slot back to INODE_REF/XATTR item, then 1125d5633b0dSQu Wenruo * need to go forward until we reach an EXTENT_DATA. 1126d5633b0dSQu Wenruo * But we should still has the correct ino as key.objectid. 1127d5633b0dSQu Wenruo */ 1128d5633b0dSQu Wenruo if (WARN_ON(key.objectid < ino) || key.type < BTRFS_EXTENT_DATA_KEY) 1129d5633b0dSQu Wenruo goto next; 1130d5633b0dSQu Wenruo 1131d5633b0dSQu Wenruo /* It's beyond our target range, definitely not extent found */ 1132d5633b0dSQu Wenruo if (key.objectid > ino || key.type > BTRFS_EXTENT_DATA_KEY) 1133d5633b0dSQu Wenruo goto not_found; 1134d5633b0dSQu Wenruo 1135d5633b0dSQu Wenruo /* 1136d5633b0dSQu Wenruo * | |<- File extent ->| 1137d5633b0dSQu Wenruo * \- start 1138d5633b0dSQu Wenruo * 1139d5633b0dSQu Wenruo * This means there is a hole between start and key.offset. 1140d5633b0dSQu Wenruo */ 1141d5633b0dSQu Wenruo if (key.offset > start) { 1142d5633b0dSQu Wenruo em->start = start; 1143d5633b0dSQu Wenruo em->orig_start = start; 1144d5633b0dSQu Wenruo em->block_start = EXTENT_MAP_HOLE; 1145d5633b0dSQu Wenruo em->len = key.offset - start; 1146d5633b0dSQu Wenruo break; 1147d5633b0dSQu Wenruo } 1148d5633b0dSQu Wenruo 1149d5633b0dSQu Wenruo fi = btrfs_item_ptr(path.nodes[0], path.slots[0], 1150d5633b0dSQu Wenruo struct btrfs_file_extent_item); 1151d5633b0dSQu Wenruo extent_end = btrfs_file_extent_end(&path); 1152d5633b0dSQu Wenruo 1153d5633b0dSQu Wenruo /* 1154d5633b0dSQu Wenruo * |<- file extent ->| | 1155d5633b0dSQu Wenruo * \- start 1156d5633b0dSQu Wenruo * 1157d5633b0dSQu Wenruo * We haven't reached start, search next slot. 1158d5633b0dSQu Wenruo */ 1159d5633b0dSQu Wenruo if (extent_end <= start) 1160d5633b0dSQu Wenruo goto next; 1161d5633b0dSQu Wenruo 1162d5633b0dSQu Wenruo /* Now this extent covers @start, convert it to em */ 1163d5633b0dSQu Wenruo btrfs_extent_item_to_extent_map(inode, &path, fi, false, em); 1164d5633b0dSQu Wenruo break; 1165d5633b0dSQu Wenruo next: 1166d5633b0dSQu Wenruo ret = btrfs_next_item(root, &path); 1167d5633b0dSQu Wenruo if (ret < 0) 1168d5633b0dSQu Wenruo goto err; 1169d5633b0dSQu Wenruo if (ret > 0) 1170d5633b0dSQu Wenruo goto not_found; 1171d5633b0dSQu Wenruo } 1172d5633b0dSQu Wenruo btrfs_release_path(&path); 1173d5633b0dSQu Wenruo return em; 1174d5633b0dSQu Wenruo 1175d5633b0dSQu Wenruo not_found: 1176d5633b0dSQu Wenruo btrfs_release_path(&path); 1177d5633b0dSQu Wenruo free_extent_map(em); 1178d5633b0dSQu Wenruo return NULL; 1179d5633b0dSQu Wenruo 1180d5633b0dSQu Wenruo err: 1181d5633b0dSQu Wenruo btrfs_release_path(&path); 1182d5633b0dSQu Wenruo free_extent_map(em); 1183d5633b0dSQu Wenruo return ERR_PTR(ret); 1184d5633b0dSQu Wenruo } 1185d5633b0dSQu Wenruo 1186e9eec721SQu Wenruo static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start, 1187d5633b0dSQu Wenruo u64 newer_than, bool locked) 118817ce6ef8SLiu Bo { 118917ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1190940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 11916c282eb4SLi Zefan struct extent_map *em; 119276068caeSQu Wenruo const u32 sectorsize = BTRFS_I(inode)->root->fs_info->sectorsize; 1193940100a4SChris Mason 1194940100a4SChris Mason /* 1195940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1196940100a4SChris Mason * the full extent lock 1197940100a4SChris Mason */ 1198940100a4SChris Mason read_lock(&em_tree->lock); 119976068caeSQu Wenruo em = lookup_extent_mapping(em_tree, start, sectorsize); 1200940100a4SChris Mason read_unlock(&em_tree->lock); 1201940100a4SChris Mason 1202199257a7SQu Wenruo /* 1203199257a7SQu Wenruo * We can get a merged extent, in that case, we need to re-search 1204199257a7SQu Wenruo * tree to get the original em for defrag. 1205199257a7SQu Wenruo * 1206199257a7SQu Wenruo * If @newer_than is 0 or em::generation < newer_than, we can trust 1207199257a7SQu Wenruo * this em, as either we don't care about the generation, or the 1208199257a7SQu Wenruo * merged extent map will be rejected anyway. 1209199257a7SQu Wenruo */ 1210199257a7SQu Wenruo if (em && test_bit(EXTENT_FLAG_MERGED, &em->flags) && 1211199257a7SQu Wenruo newer_than && em->generation >= newer_than) { 1212199257a7SQu Wenruo free_extent_map(em); 1213199257a7SQu Wenruo em = NULL; 1214199257a7SQu Wenruo } 1215199257a7SQu Wenruo 1216940100a4SChris Mason if (!em) { 1217308d9800SFilipe Manana struct extent_state *cached = NULL; 121876068caeSQu Wenruo u64 end = start + sectorsize - 1; 1219308d9800SFilipe Manana 1220940100a4SChris Mason /* get the big lock and read metadata off disk */ 1221e9eec721SQu Wenruo if (!locked) 1222ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 1223d5633b0dSQu Wenruo em = defrag_get_extent(BTRFS_I(inode), start, newer_than); 1224e9eec721SQu Wenruo if (!locked) 1225e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1226940100a4SChris Mason 12276cf8bfbfSDan Carpenter if (IS_ERR(em)) 12286c282eb4SLi Zefan return NULL; 1229940100a4SChris Mason } 1230940100a4SChris Mason 12316c282eb4SLi Zefan return em; 12326c282eb4SLi Zefan } 12336c282eb4SLi Zefan 1234979b25c3SQu Wenruo static u32 get_extent_max_capacity(const struct extent_map *em) 1235979b25c3SQu Wenruo { 1236979b25c3SQu Wenruo if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) 1237979b25c3SQu Wenruo return BTRFS_MAX_COMPRESSED; 1238979b25c3SQu Wenruo return BTRFS_MAX_EXTENT_SIZE; 1239979b25c3SQu Wenruo } 1240979b25c3SQu Wenruo 1241e9eec721SQu Wenruo static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em, 1242e9eec721SQu Wenruo bool locked) 12436c282eb4SLi Zefan { 12446c282eb4SLi Zefan struct extent_map *next; 12457093f152SQu Wenruo bool ret = false; 12466c282eb4SLi Zefan 12476c282eb4SLi Zefan /* this is the last extent */ 12486c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 12496c282eb4SLi Zefan return false; 12506c282eb4SLi Zefan 1251d5633b0dSQu Wenruo /* 1252d5633b0dSQu Wenruo * We want to check if the next extent can be merged with the current 1253d5633b0dSQu Wenruo * one, which can be an extent created in a past generation, so we pass 1254d5633b0dSQu Wenruo * a minimum generation of 0 to defrag_lookup_extent(). 1255d5633b0dSQu Wenruo */ 1256d5633b0dSQu Wenruo next = defrag_lookup_extent(inode, em->start + em->len, 0, locked); 12577093f152SQu Wenruo /* No more em or hole */ 1258e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 12597093f152SQu Wenruo goto out; 12607093f152SQu Wenruo if (test_bit(EXTENT_FLAG_PREALLOC, &next->flags)) 12617093f152SQu Wenruo goto out; 1262979b25c3SQu Wenruo /* 1263979b25c3SQu Wenruo * If the next extent is at its max capacity, defragging current extent 1264979b25c3SQu Wenruo * makes no sense, as the total number of extents won't change. 1265979b25c3SQu Wenruo */ 1266979b25c3SQu Wenruo if (next->len >= get_extent_max_capacity(em)) 1267979b25c3SQu Wenruo goto out; 12687093f152SQu Wenruo ret = true; 12697093f152SQu Wenruo out: 12706c282eb4SLi Zefan free_extent_map(next); 12716c282eb4SLi Zefan return ret; 12726c282eb4SLi Zefan } 12736c282eb4SLi Zefan 12744cb5300bSChris Mason /* 12755767b50cSQu Wenruo * Prepare one page to be defragged. 12765767b50cSQu Wenruo * 12775767b50cSQu Wenruo * This will ensure: 12785767b50cSQu Wenruo * 12795767b50cSQu Wenruo * - Returned page is locked and has been set up properly. 12805767b50cSQu Wenruo * - No ordered extent exists in the page. 12815767b50cSQu Wenruo * - The page is uptodate. 12825767b50cSQu Wenruo * 12835767b50cSQu Wenruo * NOTE: Caller should also wait for page writeback after the cluster is 12845767b50cSQu Wenruo * prepared, here we don't do writeback wait for each page. 12855767b50cSQu Wenruo */ 12865767b50cSQu Wenruo static struct page *defrag_prepare_one_page(struct btrfs_inode *inode, 12875767b50cSQu Wenruo pgoff_t index) 1288940100a4SChris Mason { 12895767b50cSQu Wenruo struct address_space *mapping = inode->vfs_inode.i_mapping; 12905767b50cSQu Wenruo gfp_t mask = btrfs_alloc_write_mask(mapping); 12915767b50cSQu Wenruo u64 page_start = (u64)index << PAGE_SHIFT; 12925767b50cSQu Wenruo u64 page_end = page_start + PAGE_SIZE - 1; 12934cb5300bSChris Mason struct extent_state *cached_state = NULL; 12944cb5300bSChris Mason struct page *page; 12955767b50cSQu Wenruo int ret; 12965767b50cSQu Wenruo 1297600a45e1SMiao Xie again: 12985767b50cSQu Wenruo page = find_or_create_page(mapping, index, mask); 12994cb5300bSChris Mason if (!page) 13005767b50cSQu Wenruo return ERR_PTR(-ENOMEM); 13015767b50cSQu Wenruo 130224bcb454SOmar Sandoval /* 130324bcb454SOmar Sandoval * Since we can defragment files opened read-only, we can encounter 130424bcb454SOmar Sandoval * transparent huge pages here (see CONFIG_READ_ONLY_THP_FOR_FS). We 130524bcb454SOmar Sandoval * can't do I/O using huge pages yet, so return an error for now. 130624bcb454SOmar Sandoval * Filesystem transparent huge pages are typically only used for 130724bcb454SOmar Sandoval * executables that explicitly enable them, so this isn't very 130824bcb454SOmar Sandoval * restrictive. 130924bcb454SOmar Sandoval */ 131024bcb454SOmar Sandoval if (PageCompound(page)) { 131124bcb454SOmar Sandoval unlock_page(page); 131224bcb454SOmar Sandoval put_page(page); 131324bcb454SOmar Sandoval return ERR_PTR(-ETXTBSY); 131424bcb454SOmar Sandoval } 13154cb5300bSChris Mason 131632443de3SQu Wenruo ret = set_page_extent_mapped(page); 131732443de3SQu Wenruo if (ret < 0) { 131832443de3SQu Wenruo unlock_page(page); 131932443de3SQu Wenruo put_page(page); 13205767b50cSQu Wenruo return ERR_PTR(ret); 132132443de3SQu Wenruo } 132232443de3SQu Wenruo 13235767b50cSQu Wenruo /* Wait for any existing ordered extent in the range */ 1324600a45e1SMiao Xie while (1) { 13255767b50cSQu Wenruo struct btrfs_ordered_extent *ordered; 13265767b50cSQu Wenruo 13275767b50cSQu Wenruo lock_extent_bits(&inode->io_tree, page_start, page_end, &cached_state); 13285767b50cSQu Wenruo ordered = btrfs_lookup_ordered_range(inode, page_start, PAGE_SIZE); 13295767b50cSQu Wenruo unlock_extent_cached(&inode->io_tree, page_start, page_end, 1330e43bbe5eSDavid Sterba &cached_state); 1331600a45e1SMiao Xie if (!ordered) 1332600a45e1SMiao Xie break; 1333600a45e1SMiao Xie 1334600a45e1SMiao Xie unlock_page(page); 1335c0a43603SNikolay Borisov btrfs_start_ordered_extent(ordered, 1); 1336600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1337600a45e1SMiao Xie lock_page(page); 13381f12bd06SLiu Bo /* 13395767b50cSQu Wenruo * We unlocked the page above, so we need check if it was 13405767b50cSQu Wenruo * released or not. 13411f12bd06SLiu Bo */ 13425767b50cSQu Wenruo if (page->mapping != mapping || !PagePrivate(page)) { 13431f12bd06SLiu Bo unlock_page(page); 134409cbfeafSKirill A. Shutemov put_page(page); 13451f12bd06SLiu Bo goto again; 13461f12bd06SLiu Bo } 1347600a45e1SMiao Xie } 1348600a45e1SMiao Xie 13495767b50cSQu Wenruo /* 13505767b50cSQu Wenruo * Now the page range has no ordered extent any more. Read the page to 13515767b50cSQu Wenruo * make it uptodate. 13525767b50cSQu Wenruo */ 13534cb5300bSChris Mason if (!PageUptodate(page)) { 13544cb5300bSChris Mason btrfs_readpage(NULL, page); 13554cb5300bSChris Mason lock_page(page); 13565767b50cSQu Wenruo if (page->mapping != mapping || !PagePrivate(page)) { 1357600a45e1SMiao Xie unlock_page(page); 135809cbfeafSKirill A. Shutemov put_page(page); 1359600a45e1SMiao Xie goto again; 1360600a45e1SMiao Xie } 13615767b50cSQu Wenruo if (!PageUptodate(page)) { 13625767b50cSQu Wenruo unlock_page(page); 13635767b50cSQu Wenruo put_page(page); 13645767b50cSQu Wenruo return ERR_PTR(-EIO); 13654cb5300bSChris Mason } 13665767b50cSQu Wenruo } 13675767b50cSQu Wenruo return page; 13685767b50cSQu Wenruo } 13694cb5300bSChris Mason 1370eb793cf8SQu Wenruo struct defrag_target_range { 1371eb793cf8SQu Wenruo struct list_head list; 1372eb793cf8SQu Wenruo u64 start; 1373eb793cf8SQu Wenruo u64 len; 1374eb793cf8SQu Wenruo }; 13754cb5300bSChris Mason 13764cb5300bSChris Mason /* 1377eb793cf8SQu Wenruo * Collect all valid target extents. 1378eb793cf8SQu Wenruo * 1379eb793cf8SQu Wenruo * @start: file offset to lookup 1380eb793cf8SQu Wenruo * @len: length to lookup 1381eb793cf8SQu Wenruo * @extent_thresh: file extent size threshold, any extent size >= this value 1382eb793cf8SQu Wenruo * will be ignored 1383eb793cf8SQu Wenruo * @newer_than: only defrag extents newer than this value 1384eb793cf8SQu Wenruo * @do_compress: whether the defrag is doing compression 1385eb793cf8SQu Wenruo * if true, @extent_thresh will be ignored and all regular 1386eb793cf8SQu Wenruo * file extents meeting @newer_than will be targets. 1387e9eec721SQu Wenruo * @locked: if the range has already held extent lock 1388eb793cf8SQu Wenruo * @target_list: list of targets file extents 13894cb5300bSChris Mason */ 1390eb793cf8SQu Wenruo static int defrag_collect_targets(struct btrfs_inode *inode, 1391eb793cf8SQu Wenruo u64 start, u64 len, u32 extent_thresh, 1392eb793cf8SQu Wenruo u64 newer_than, bool do_compress, 1393966d879bSQu Wenruo bool locked, struct list_head *target_list, 1394966d879bSQu Wenruo u64 *last_scanned_ret) 1395eb793cf8SQu Wenruo { 1396966d879bSQu Wenruo bool last_is_target = false; 1397eb793cf8SQu Wenruo u64 cur = start; 1398eb793cf8SQu Wenruo int ret = 0; 1399eb793cf8SQu Wenruo 1400eb793cf8SQu Wenruo while (cur < start + len) { 1401eb793cf8SQu Wenruo struct extent_map *em; 1402eb793cf8SQu Wenruo struct defrag_target_range *new; 1403eb793cf8SQu Wenruo bool next_mergeable = true; 1404eb793cf8SQu Wenruo u64 range_len; 1405eb793cf8SQu Wenruo 1406966d879bSQu Wenruo last_is_target = false; 1407d5633b0dSQu Wenruo em = defrag_lookup_extent(&inode->vfs_inode, cur, 1408d5633b0dSQu Wenruo newer_than, locked); 1409eb793cf8SQu Wenruo if (!em) 1410eb793cf8SQu Wenruo break; 1411eb793cf8SQu Wenruo 1412eb793cf8SQu Wenruo /* Skip hole/inline/preallocated extents */ 1413eb793cf8SQu Wenruo if (em->block_start >= EXTENT_MAP_LAST_BYTE || 1414eb793cf8SQu Wenruo test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) 1415eb793cf8SQu Wenruo goto next; 1416eb793cf8SQu Wenruo 1417eb793cf8SQu Wenruo /* Skip older extent */ 1418eb793cf8SQu Wenruo if (em->generation < newer_than) 1419eb793cf8SQu Wenruo goto next; 1420eb793cf8SQu Wenruo 14210d1ffa22SQu Wenruo /* This em is under writeback, no need to defrag */ 14220d1ffa22SQu Wenruo if (em->generation == (u64)-1) 14230d1ffa22SQu Wenruo goto next; 14240d1ffa22SQu Wenruo 1425eb793cf8SQu Wenruo /* 14260cb5950fSFilipe Manana * Our start offset might be in the middle of an existing extent 14270cb5950fSFilipe Manana * map, so take that into account. 14280cb5950fSFilipe Manana */ 14290cb5950fSFilipe Manana range_len = em->len - (cur - em->start); 14300cb5950fSFilipe Manana /* 14310cb5950fSFilipe Manana * If this range of the extent map is already flagged for delalloc, 14320cb5950fSFilipe Manana * skip it, because: 14330cb5950fSFilipe Manana * 14340cb5950fSFilipe Manana * 1) We could deadlock later, when trying to reserve space for 14350cb5950fSFilipe Manana * delalloc, because in case we can't immediately reserve space 14360cb5950fSFilipe Manana * the flusher can start delalloc and wait for the respective 14370cb5950fSFilipe Manana * ordered extents to complete. The deadlock would happen 14380cb5950fSFilipe Manana * because we do the space reservation while holding the range 14390cb5950fSFilipe Manana * locked, and starting writeback, or finishing an ordered 14400cb5950fSFilipe Manana * extent, requires locking the range; 14410cb5950fSFilipe Manana * 14420cb5950fSFilipe Manana * 2) If there's delalloc there, it means there's dirty pages for 14430cb5950fSFilipe Manana * which writeback has not started yet (we clean the delalloc 14440cb5950fSFilipe Manana * flag when starting writeback and after creating an ordered 14450cb5950fSFilipe Manana * extent). If we mark pages in an adjacent range for defrag, 14460cb5950fSFilipe Manana * then we will have a larger contiguous range for delalloc, 14470cb5950fSFilipe Manana * very likely resulting in a larger extent after writeback is 14480cb5950fSFilipe Manana * triggered (except in a case of free space fragmentation). 14490cb5950fSFilipe Manana */ 14500cb5950fSFilipe Manana if (test_range_bit(&inode->io_tree, cur, cur + range_len - 1, 14510cb5950fSFilipe Manana EXTENT_DELALLOC, 0, NULL)) 14520cb5950fSFilipe Manana goto next; 14530cb5950fSFilipe Manana 14540cb5950fSFilipe Manana /* 1455eb793cf8SQu Wenruo * For do_compress case, we want to compress all valid file 1456eb793cf8SQu Wenruo * extents, thus no @extent_thresh or mergeable check. 1457eb793cf8SQu Wenruo */ 1458eb793cf8SQu Wenruo if (do_compress) 1459eb793cf8SQu Wenruo goto add; 1460eb793cf8SQu Wenruo 1461eb793cf8SQu Wenruo /* Skip too large extent */ 14620cb5950fSFilipe Manana if (range_len >= extent_thresh) 1463eb793cf8SQu Wenruo goto next; 1464eb793cf8SQu Wenruo 1465979b25c3SQu Wenruo /* 1466979b25c3SQu Wenruo * Skip extents already at its max capacity, this is mostly for 1467979b25c3SQu Wenruo * compressed extents, which max cap is only 128K. 1468979b25c3SQu Wenruo */ 1469979b25c3SQu Wenruo if (em->len >= get_extent_max_capacity(em)) 1470979b25c3SQu Wenruo goto next; 1471979b25c3SQu Wenruo 1472e9eec721SQu Wenruo next_mergeable = defrag_check_next_extent(&inode->vfs_inode, em, 1473e9eec721SQu Wenruo locked); 1474eb793cf8SQu Wenruo if (!next_mergeable) { 1475eb793cf8SQu Wenruo struct defrag_target_range *last; 1476eb793cf8SQu Wenruo 1477eb793cf8SQu Wenruo /* Empty target list, no way to merge with last entry */ 1478eb793cf8SQu Wenruo if (list_empty(target_list)) 1479eb793cf8SQu Wenruo goto next; 1480eb793cf8SQu Wenruo last = list_entry(target_list->prev, 1481eb793cf8SQu Wenruo struct defrag_target_range, list); 1482eb793cf8SQu Wenruo /* Not mergeable with last entry */ 1483eb793cf8SQu Wenruo if (last->start + last->len != cur) 1484eb793cf8SQu Wenruo goto next; 1485eb793cf8SQu Wenruo 1486eb793cf8SQu Wenruo /* Mergeable, fall through to add it to @target_list. */ 1487eb793cf8SQu Wenruo } 1488eb793cf8SQu Wenruo 1489eb793cf8SQu Wenruo add: 1490966d879bSQu Wenruo last_is_target = true; 1491eb793cf8SQu Wenruo range_len = min(extent_map_end(em), start + len) - cur; 1492eb793cf8SQu Wenruo /* 1493eb793cf8SQu Wenruo * This one is a good target, check if it can be merged into 1494eb793cf8SQu Wenruo * last range of the target list. 1495eb793cf8SQu Wenruo */ 1496eb793cf8SQu Wenruo if (!list_empty(target_list)) { 1497eb793cf8SQu Wenruo struct defrag_target_range *last; 1498eb793cf8SQu Wenruo 1499eb793cf8SQu Wenruo last = list_entry(target_list->prev, 1500eb793cf8SQu Wenruo struct defrag_target_range, list); 1501eb793cf8SQu Wenruo ASSERT(last->start + last->len <= cur); 1502eb793cf8SQu Wenruo if (last->start + last->len == cur) { 1503eb793cf8SQu Wenruo /* Mergeable, enlarge the last entry */ 1504eb793cf8SQu Wenruo last->len += range_len; 1505eb793cf8SQu Wenruo goto next; 1506eb793cf8SQu Wenruo } 1507eb793cf8SQu Wenruo /* Fall through to allocate a new entry */ 1508eb793cf8SQu Wenruo } 1509eb793cf8SQu Wenruo 1510eb793cf8SQu Wenruo /* Allocate new defrag_target_range */ 1511eb793cf8SQu Wenruo new = kmalloc(sizeof(*new), GFP_NOFS); 1512eb793cf8SQu Wenruo if (!new) { 1513eb793cf8SQu Wenruo free_extent_map(em); 1514eb793cf8SQu Wenruo ret = -ENOMEM; 1515eb793cf8SQu Wenruo break; 1516eb793cf8SQu Wenruo } 1517eb793cf8SQu Wenruo new->start = cur; 1518eb793cf8SQu Wenruo new->len = range_len; 1519eb793cf8SQu Wenruo list_add_tail(&new->list, target_list); 1520eb793cf8SQu Wenruo 1521eb793cf8SQu Wenruo next: 1522eb793cf8SQu Wenruo cur = extent_map_end(em); 1523eb793cf8SQu Wenruo free_extent_map(em); 1524eb793cf8SQu Wenruo } 1525eb793cf8SQu Wenruo if (ret < 0) { 1526eb793cf8SQu Wenruo struct defrag_target_range *entry; 1527eb793cf8SQu Wenruo struct defrag_target_range *tmp; 1528eb793cf8SQu Wenruo 1529eb793cf8SQu Wenruo list_for_each_entry_safe(entry, tmp, target_list, list) { 1530eb793cf8SQu Wenruo list_del_init(&entry->list); 1531eb793cf8SQu Wenruo kfree(entry); 1532eb793cf8SQu Wenruo } 1533eb793cf8SQu Wenruo } 1534966d879bSQu Wenruo if (!ret && last_scanned_ret) { 1535966d879bSQu Wenruo /* 1536966d879bSQu Wenruo * If the last extent is not a target, the caller can skip to 1537966d879bSQu Wenruo * the end of that extent. 1538966d879bSQu Wenruo * Otherwise, we can only go the end of the specified range. 1539966d879bSQu Wenruo */ 1540966d879bSQu Wenruo if (!last_is_target) 1541966d879bSQu Wenruo *last_scanned_ret = max(cur, *last_scanned_ret); 1542966d879bSQu Wenruo else 1543966d879bSQu Wenruo *last_scanned_ret = max(start + len, *last_scanned_ret); 1544966d879bSQu Wenruo } 1545eb793cf8SQu Wenruo return ret; 1546eb793cf8SQu Wenruo } 1547eb793cf8SQu Wenruo 154822b398eeSQu Wenruo #define CLUSTER_SIZE (SZ_256K) 1549a55e65b8SDavid Sterba static_assert(IS_ALIGNED(CLUSTER_SIZE, PAGE_SIZE)); 155022b398eeSQu Wenruo 155122b398eeSQu Wenruo /* 155222b398eeSQu Wenruo * Defrag one contiguous target range. 155322b398eeSQu Wenruo * 155422b398eeSQu Wenruo * @inode: target inode 155522b398eeSQu Wenruo * @target: target range to defrag 155622b398eeSQu Wenruo * @pages: locked pages covering the defrag range 155722b398eeSQu Wenruo * @nr_pages: number of locked pages 155822b398eeSQu Wenruo * 155922b398eeSQu Wenruo * Caller should ensure: 156022b398eeSQu Wenruo * 156122b398eeSQu Wenruo * - Pages are prepared 156222b398eeSQu Wenruo * Pages should be locked, no ordered extent in the pages range, 156322b398eeSQu Wenruo * no writeback. 156422b398eeSQu Wenruo * 156522b398eeSQu Wenruo * - Extent bits are locked 156622b398eeSQu Wenruo */ 156722b398eeSQu Wenruo static int defrag_one_locked_target(struct btrfs_inode *inode, 156822b398eeSQu Wenruo struct defrag_target_range *target, 156922b398eeSQu Wenruo struct page **pages, int nr_pages, 157022b398eeSQu Wenruo struct extent_state **cached_state) 157122b398eeSQu Wenruo { 157222b398eeSQu Wenruo struct btrfs_fs_info *fs_info = inode->root->fs_info; 157322b398eeSQu Wenruo struct extent_changeset *data_reserved = NULL; 157422b398eeSQu Wenruo const u64 start = target->start; 157522b398eeSQu Wenruo const u64 len = target->len; 157622b398eeSQu Wenruo unsigned long last_index = (start + len - 1) >> PAGE_SHIFT; 157722b398eeSQu Wenruo unsigned long start_index = start >> PAGE_SHIFT; 157822b398eeSQu Wenruo unsigned long first_index = page_index(pages[0]); 157922b398eeSQu Wenruo int ret = 0; 158022b398eeSQu Wenruo int i; 158122b398eeSQu Wenruo 158222b398eeSQu Wenruo ASSERT(last_index - first_index + 1 <= nr_pages); 158322b398eeSQu Wenruo 158422b398eeSQu Wenruo ret = btrfs_delalloc_reserve_space(inode, &data_reserved, start, len); 158522b398eeSQu Wenruo if (ret < 0) 158622b398eeSQu Wenruo return ret; 158722b398eeSQu Wenruo clear_extent_bit(&inode->io_tree, start, start + len - 1, 158822b398eeSQu Wenruo EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 158922b398eeSQu Wenruo EXTENT_DEFRAG, 0, 0, cached_state); 159022b398eeSQu Wenruo set_extent_defrag(&inode->io_tree, start, start + len - 1, cached_state); 159122b398eeSQu Wenruo 159222b398eeSQu Wenruo /* Update the page status */ 159322b398eeSQu Wenruo for (i = start_index - first_index; i <= last_index - first_index; i++) { 159422b398eeSQu Wenruo ClearPageChecked(pages[i]); 159522b398eeSQu Wenruo btrfs_page_clamp_set_dirty(fs_info, pages[i], start, len); 159622b398eeSQu Wenruo } 159722b398eeSQu Wenruo btrfs_delalloc_release_extents(inode, len); 159822b398eeSQu Wenruo extent_changeset_free(data_reserved); 159922b398eeSQu Wenruo 160022b398eeSQu Wenruo return ret; 160122b398eeSQu Wenruo } 160222b398eeSQu Wenruo 1603e9eec721SQu Wenruo static int defrag_one_range(struct btrfs_inode *inode, u64 start, u32 len, 1604966d879bSQu Wenruo u32 extent_thresh, u64 newer_than, bool do_compress, 1605966d879bSQu Wenruo u64 *last_scanned_ret) 1606e9eec721SQu Wenruo { 1607e9eec721SQu Wenruo struct extent_state *cached_state = NULL; 1608e9eec721SQu Wenruo struct defrag_target_range *entry; 1609e9eec721SQu Wenruo struct defrag_target_range *tmp; 1610e9eec721SQu Wenruo LIST_HEAD(target_list); 1611e9eec721SQu Wenruo struct page **pages; 1612e9eec721SQu Wenruo const u32 sectorsize = inode->root->fs_info->sectorsize; 1613e9eec721SQu Wenruo u64 last_index = (start + len - 1) >> PAGE_SHIFT; 1614e9eec721SQu Wenruo u64 start_index = start >> PAGE_SHIFT; 1615e9eec721SQu Wenruo unsigned int nr_pages = last_index - start_index + 1; 1616e9eec721SQu Wenruo int ret = 0; 1617e9eec721SQu Wenruo int i; 1618e9eec721SQu Wenruo 1619e9eec721SQu Wenruo ASSERT(nr_pages <= CLUSTER_SIZE / PAGE_SIZE); 1620e9eec721SQu Wenruo ASSERT(IS_ALIGNED(start, sectorsize) && IS_ALIGNED(len, sectorsize)); 1621e9eec721SQu Wenruo 1622e9eec721SQu Wenruo pages = kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS); 1623e9eec721SQu Wenruo if (!pages) 1624e9eec721SQu Wenruo return -ENOMEM; 1625e9eec721SQu Wenruo 1626e9eec721SQu Wenruo /* Prepare all pages */ 1627e9eec721SQu Wenruo for (i = 0; i < nr_pages; i++) { 1628e9eec721SQu Wenruo pages[i] = defrag_prepare_one_page(inode, start_index + i); 1629e9eec721SQu Wenruo if (IS_ERR(pages[i])) { 1630e9eec721SQu Wenruo ret = PTR_ERR(pages[i]); 1631e9eec721SQu Wenruo pages[i] = NULL; 1632e9eec721SQu Wenruo goto free_pages; 1633e9eec721SQu Wenruo } 1634e9eec721SQu Wenruo } 1635e9eec721SQu Wenruo for (i = 0; i < nr_pages; i++) 16364cb5300bSChris Mason wait_on_page_writeback(pages[i]); 16374cb5300bSChris Mason 1638e9eec721SQu Wenruo /* Lock the pages range */ 1639e9eec721SQu Wenruo lock_extent_bits(&inode->io_tree, start_index << PAGE_SHIFT, 1640e9eec721SQu Wenruo (last_index << PAGE_SHIFT) + PAGE_SIZE - 1, 1641e9eec721SQu Wenruo &cached_state); 1642e9eec721SQu Wenruo /* 1643e9eec721SQu Wenruo * Now we have a consistent view about the extent map, re-check 1644e9eec721SQu Wenruo * which range really needs to be defragged. 1645e9eec721SQu Wenruo * 1646e9eec721SQu Wenruo * And this time we have extent locked already, pass @locked = true 1647e9eec721SQu Wenruo * so that we won't relock the extent range and cause deadlock. 1648e9eec721SQu Wenruo */ 1649e9eec721SQu Wenruo ret = defrag_collect_targets(inode, start, len, extent_thresh, 1650e9eec721SQu Wenruo newer_than, do_compress, true, 1651966d879bSQu Wenruo &target_list, last_scanned_ret); 1652e9eec721SQu Wenruo if (ret < 0) 1653e9eec721SQu Wenruo goto unlock_extent; 16544cb5300bSChris Mason 1655e9eec721SQu Wenruo list_for_each_entry(entry, &target_list, list) { 1656e9eec721SQu Wenruo ret = defrag_one_locked_target(inode, entry, pages, nr_pages, 1657e9eec721SQu Wenruo &cached_state); 1658e9eec721SQu Wenruo if (ret < 0) 1659e9eec721SQu Wenruo break; 1660e9eec721SQu Wenruo } 1661e9eec721SQu Wenruo 1662e9eec721SQu Wenruo list_for_each_entry_safe(entry, tmp, &target_list, list) { 1663e9eec721SQu Wenruo list_del_init(&entry->list); 1664e9eec721SQu Wenruo kfree(entry); 1665e9eec721SQu Wenruo } 1666e9eec721SQu Wenruo unlock_extent: 1667e9eec721SQu Wenruo unlock_extent_cached(&inode->io_tree, start_index << PAGE_SHIFT, 1668e9eec721SQu Wenruo (last_index << PAGE_SHIFT) + PAGE_SIZE - 1, 1669e9eec721SQu Wenruo &cached_state); 1670e9eec721SQu Wenruo free_pages: 1671e9eec721SQu Wenruo for (i = 0; i < nr_pages; i++) { 1672e9eec721SQu Wenruo if (pages[i]) { 1673e9eec721SQu Wenruo unlock_page(pages[i]); 1674e9eec721SQu Wenruo put_page(pages[i]); 1675e9eec721SQu Wenruo } 1676e9eec721SQu Wenruo } 1677e9eec721SQu Wenruo kfree(pages); 1678e9eec721SQu Wenruo return ret; 1679e9eec721SQu Wenruo } 1680e9eec721SQu Wenruo 1681b18c3ab2SQu Wenruo static int defrag_one_cluster(struct btrfs_inode *inode, 1682b18c3ab2SQu Wenruo struct file_ra_state *ra, 1683b18c3ab2SQu Wenruo u64 start, u32 len, u32 extent_thresh, 1684b18c3ab2SQu Wenruo u64 newer_than, bool do_compress, 1685b18c3ab2SQu Wenruo unsigned long *sectors_defragged, 1686966d879bSQu Wenruo unsigned long max_sectors, 1687966d879bSQu Wenruo u64 *last_scanned_ret) 1688b18c3ab2SQu Wenruo { 1689b18c3ab2SQu Wenruo const u32 sectorsize = inode->root->fs_info->sectorsize; 1690b18c3ab2SQu Wenruo struct defrag_target_range *entry; 1691b18c3ab2SQu Wenruo struct defrag_target_range *tmp; 1692b18c3ab2SQu Wenruo LIST_HEAD(target_list); 1693b18c3ab2SQu Wenruo int ret; 1694b18c3ab2SQu Wenruo 1695b18c3ab2SQu Wenruo ret = defrag_collect_targets(inode, start, len, extent_thresh, 1696b18c3ab2SQu Wenruo newer_than, do_compress, false, 1697966d879bSQu Wenruo &target_list, NULL); 1698b18c3ab2SQu Wenruo if (ret < 0) 1699b18c3ab2SQu Wenruo goto out; 1700b18c3ab2SQu Wenruo 1701b18c3ab2SQu Wenruo list_for_each_entry(entry, &target_list, list) { 1702b18c3ab2SQu Wenruo u32 range_len = entry->len; 1703b18c3ab2SQu Wenruo 1704484167daSQu Wenruo /* Reached or beyond the limit */ 1705c080b414SQu Wenruo if (max_sectors && *sectors_defragged >= max_sectors) { 1706c080b414SQu Wenruo ret = 1; 1707b18c3ab2SQu Wenruo break; 1708c080b414SQu Wenruo } 1709b18c3ab2SQu Wenruo 1710b18c3ab2SQu Wenruo if (max_sectors) 1711b18c3ab2SQu Wenruo range_len = min_t(u32, range_len, 1712b18c3ab2SQu Wenruo (max_sectors - *sectors_defragged) * sectorsize); 1713b18c3ab2SQu Wenruo 1714966d879bSQu Wenruo /* 1715966d879bSQu Wenruo * If defrag_one_range() has updated last_scanned_ret, 1716966d879bSQu Wenruo * our range may already be invalid (e.g. hole punched). 1717966d879bSQu Wenruo * Skip if our range is before last_scanned_ret, as there is 1718966d879bSQu Wenruo * no need to defrag the range anymore. 1719966d879bSQu Wenruo */ 1720966d879bSQu Wenruo if (entry->start + range_len <= *last_scanned_ret) 1721966d879bSQu Wenruo continue; 1722966d879bSQu Wenruo 1723b18c3ab2SQu Wenruo if (ra) 1724b18c3ab2SQu Wenruo page_cache_sync_readahead(inode->vfs_inode.i_mapping, 1725b18c3ab2SQu Wenruo ra, NULL, entry->start >> PAGE_SHIFT, 1726b18c3ab2SQu Wenruo ((entry->start + range_len - 1) >> PAGE_SHIFT) - 1727b18c3ab2SQu Wenruo (entry->start >> PAGE_SHIFT) + 1); 1728b18c3ab2SQu Wenruo /* 1729b18c3ab2SQu Wenruo * Here we may not defrag any range if holes are punched before 1730b18c3ab2SQu Wenruo * we locked the pages. 1731b18c3ab2SQu Wenruo * But that's fine, it only affects the @sectors_defragged 1732b18c3ab2SQu Wenruo * accounting. 1733b18c3ab2SQu Wenruo */ 1734b18c3ab2SQu Wenruo ret = defrag_one_range(inode, entry->start, range_len, 1735966d879bSQu Wenruo extent_thresh, newer_than, do_compress, 1736966d879bSQu Wenruo last_scanned_ret); 1737b18c3ab2SQu Wenruo if (ret < 0) 1738b18c3ab2SQu Wenruo break; 1739484167daSQu Wenruo *sectors_defragged += range_len >> 1740484167daSQu Wenruo inode->root->fs_info->sectorsize_bits; 1741b18c3ab2SQu Wenruo } 1742b18c3ab2SQu Wenruo out: 1743b18c3ab2SQu Wenruo list_for_each_entry_safe(entry, tmp, &target_list, list) { 1744b18c3ab2SQu Wenruo list_del_init(&entry->list); 1745b18c3ab2SQu Wenruo kfree(entry); 1746b18c3ab2SQu Wenruo } 1747966d879bSQu Wenruo if (ret >= 0) 1748966d879bSQu Wenruo *last_scanned_ret = max(*last_scanned_ret, start + len); 1749b18c3ab2SQu Wenruo return ret; 1750b18c3ab2SQu Wenruo } 17517f458a38SFilipe Manana 17527f458a38SFilipe Manana /* 17531ccc2e8aSQu Wenruo * Entry point to file defragmentation. 17541ccc2e8aSQu Wenruo * 17551ccc2e8aSQu Wenruo * @inode: inode to be defragged 17561ccc2e8aSQu Wenruo * @ra: readahead state (can be NUL) 17571ccc2e8aSQu Wenruo * @range: defrag options including range and flags 17581ccc2e8aSQu Wenruo * @newer_than: minimum transid to defrag 17591ccc2e8aSQu Wenruo * @max_to_defrag: max number of sectors to be defragged, if 0, the whole inode 17601ccc2e8aSQu Wenruo * will be defragged. 1761484167daSQu Wenruo * 1762484167daSQu Wenruo * Return <0 for error. 1763c080b414SQu Wenruo * Return >=0 for the number of sectors defragged, and range->start will be updated 1764c080b414SQu Wenruo * to indicate the file offset where next defrag should be started at. 1765c080b414SQu Wenruo * (Mostly for autodefrag, which sets @max_to_defrag thus we may exit early without 1766c080b414SQu Wenruo * defragging all the range). 17677f458a38SFilipe Manana */ 17681ccc2e8aSQu Wenruo int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra, 17694cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 17704cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 17714cb5300bSChris Mason { 17720b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 17737b508037SQu Wenruo unsigned long sectors_defragged = 0; 1774151a31b2SLi Zefan u64 isize = i_size_read(inode); 17757b508037SQu Wenruo u64 cur; 17767b508037SQu Wenruo u64 last_byte; 17771e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 17781ccc2e8aSQu Wenruo bool ra_allocated = false; 17797b508037SQu Wenruo int compress_type = BTRFS_COMPRESS_ZLIB; 17807b508037SQu Wenruo int ret = 0; 17817b508037SQu Wenruo u32 extent_thresh = range->extent_thresh; 178227cdfde1SFilipe Manana pgoff_t start_index; 17834cb5300bSChris Mason 17840abd5b17SLiu Bo if (isize == 0) 17850abd5b17SLiu Bo return 0; 17860abd5b17SLiu Bo 17870abd5b17SLiu Bo if (range->start >= isize) 17880abd5b17SLiu Bo return -EINVAL; 17891a419d85SLi Zefan 17901e2ef46dSDavid Sterba if (do_compress) { 1791ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 17921a419d85SLi Zefan return -EINVAL; 17931a419d85SLi Zefan if (range->compress_type) 17941a419d85SLi Zefan compress_type = range->compress_type; 17951a419d85SLi Zefan } 1796f46b5a66SChristoph Hellwig 17970abd5b17SLiu Bo if (extent_thresh == 0) 1798ee22184bSByongho Lee extent_thresh = SZ_256K; 1799f46b5a66SChristoph Hellwig 18007b508037SQu Wenruo if (range->start + range->len > range->start) { 18017b508037SQu Wenruo /* Got a specific range */ 18026b34cd8eSFilipe Manana last_byte = min(isize, range->start + range->len); 18037b508037SQu Wenruo } else { 18047b508037SQu Wenruo /* Defrag until file end */ 18056b34cd8eSFilipe Manana last_byte = isize; 18067b508037SQu Wenruo } 18077b508037SQu Wenruo 18086b34cd8eSFilipe Manana /* Align the range */ 18096b34cd8eSFilipe Manana cur = round_down(range->start, fs_info->sectorsize); 18106b34cd8eSFilipe Manana last_byte = round_up(last_byte, fs_info->sectorsize) - 1; 18116b34cd8eSFilipe Manana 18124cb5300bSChris Mason /* 18131ccc2e8aSQu Wenruo * If we were not given a ra, allocate a readahead context. As 18140a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 18150a52d108SDavid Sterba * we don't error out. 18164cb5300bSChris Mason */ 18171ccc2e8aSQu Wenruo if (!ra) { 18181ccc2e8aSQu Wenruo ra_allocated = true; 181963e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 18200a52d108SDavid Sterba if (ra) 18214cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 18224cb5300bSChris Mason } 18234cb5300bSChris Mason 182427cdfde1SFilipe Manana /* 182527cdfde1SFilipe Manana * Make writeback start from the beginning of the range, so that the 182627cdfde1SFilipe Manana * defrag range can be written sequentially. 182727cdfde1SFilipe Manana */ 182827cdfde1SFilipe Manana start_index = cur >> PAGE_SHIFT; 182927cdfde1SFilipe Manana if (start_index < inode->i_mapping->writeback_index) 183027cdfde1SFilipe Manana inode->i_mapping->writeback_index = start_index; 183127cdfde1SFilipe Manana 18327b508037SQu Wenruo while (cur < last_byte) { 18333c9d31c7SFilipe Manana const unsigned long prev_sectors_defragged = sectors_defragged; 1834966d879bSQu Wenruo u64 last_scanned = cur; 18357b508037SQu Wenruo u64 cluster_end; 18361e701a32SChris Mason 1837b767c2fcSFilipe Manana if (btrfs_defrag_cancelled(fs_info)) { 1838b767c2fcSFilipe Manana ret = -EAGAIN; 1839b767c2fcSFilipe Manana break; 1840b767c2fcSFilipe Manana } 1841b767c2fcSFilipe Manana 18427b508037SQu Wenruo /* We want the cluster end at page boundary when possible */ 18437b508037SQu Wenruo cluster_end = (((cur >> PAGE_SHIFT) + 18447b508037SQu Wenruo (SZ_256K >> PAGE_SHIFT)) << PAGE_SHIFT) - 1; 18457b508037SQu Wenruo cluster_end = min(cluster_end, last_byte); 18464cb5300bSChris Mason 184764708539SJosef Bacik btrfs_inode_lock(inode, 0); 1848eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1849eede2bf3SOmar Sandoval ret = -ETXTBSY; 18507b508037SQu Wenruo btrfs_inode_unlock(inode, 0); 18517b508037SQu Wenruo break; 18527b508037SQu Wenruo } 18537b508037SQu Wenruo if (!(inode->i_sb->s_flags & SB_ACTIVE)) { 18547b508037SQu Wenruo btrfs_inode_unlock(inode, 0); 18557b508037SQu Wenruo break; 18567b508037SQu Wenruo } 18571e2ef46dSDavid Sterba if (do_compress) 1858eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 18597b508037SQu Wenruo ret = defrag_one_cluster(BTRFS_I(inode), ra, cur, 18607b508037SQu Wenruo cluster_end + 1 - cur, extent_thresh, 1861966d879bSQu Wenruo newer_than, do_compress, §ors_defragged, 1862966d879bSQu Wenruo max_to_defrag, &last_scanned); 18633c9d31c7SFilipe Manana 18643c9d31c7SFilipe Manana if (sectors_defragged > prev_sectors_defragged) 18653c9d31c7SFilipe Manana balance_dirty_pages_ratelimited(inode->i_mapping); 18663c9d31c7SFilipe Manana 186764708539SJosef Bacik btrfs_inode_unlock(inode, 0); 18687b508037SQu Wenruo if (ret < 0) 18694cb5300bSChris Mason break; 1870966d879bSQu Wenruo cur = max(cluster_end + 1, last_scanned); 1871c080b414SQu Wenruo if (ret > 0) { 1872c080b414SQu Wenruo ret = 0; 1873c080b414SQu Wenruo break; 1874c080b414SQu Wenruo } 1875ea0eba69SQu Wenruo cond_resched(); 18764cb5300bSChris Mason } 1877f46b5a66SChristoph Hellwig 18787b508037SQu Wenruo if (ra_allocated) 18797b508037SQu Wenruo kfree(ra); 1880c080b414SQu Wenruo /* 1881c080b414SQu Wenruo * Update range.start for autodefrag, this will indicate where to start 1882c080b414SQu Wenruo * in next run. 1883c080b414SQu Wenruo */ 1884c080b414SQu Wenruo range->start = cur; 18857b508037SQu Wenruo if (sectors_defragged) { 18867b508037SQu Wenruo /* 18877b508037SQu Wenruo * We have defragged some sectors, for compression case they 18887b508037SQu Wenruo * need to be written back immediately. 18897b508037SQu Wenruo */ 18907b508037SQu Wenruo if (range->flags & BTRFS_DEFRAG_RANGE_START_IO) { 18911e701a32SChris Mason filemap_flush(inode->i_mapping); 1892dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1893dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1894dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1895dec8ef90SFilipe Manana } 18967b508037SQu Wenruo if (range->compress_type == BTRFS_COMPRESS_LZO) 18970b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 18987b508037SQu Wenruo else if (range->compress_type == BTRFS_COMPRESS_ZSTD) 18995c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 19007b508037SQu Wenruo ret = sectors_defragged; 19011a419d85SLi Zefan } 19021e2ef46dSDavid Sterba if (do_compress) { 190364708539SJosef Bacik btrfs_inode_lock(inode, 0); 1904eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 190564708539SJosef Bacik btrfs_inode_unlock(inode, 0); 1906633085c7SFilipe David Borba Manana } 1907940100a4SChris Mason return ret; 1908f46b5a66SChristoph Hellwig } 1909f46b5a66SChristoph Hellwig 191017aaa434SDavid Sterba /* 191117aaa434SDavid Sterba * Try to start exclusive operation @type or cancel it if it's running. 191217aaa434SDavid Sterba * 191317aaa434SDavid Sterba * Return: 191417aaa434SDavid Sterba * 0 - normal mode, newly claimed op started 191517aaa434SDavid Sterba * >0 - normal mode, something else is running, 191617aaa434SDavid Sterba * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space 191717aaa434SDavid Sterba * ECANCELED - cancel mode, successful cancel 191817aaa434SDavid Sterba * ENOTCONN - cancel mode, operation not running anymore 191917aaa434SDavid Sterba */ 192017aaa434SDavid Sterba static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info, 192117aaa434SDavid Sterba enum btrfs_exclusive_operation type, bool cancel) 192217aaa434SDavid Sterba { 192317aaa434SDavid Sterba if (!cancel) { 192417aaa434SDavid Sterba /* Start normal op */ 192517aaa434SDavid Sterba if (!btrfs_exclop_start(fs_info, type)) 192617aaa434SDavid Sterba return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 192717aaa434SDavid Sterba /* Exclusive operation is now claimed */ 192817aaa434SDavid Sterba return 0; 192917aaa434SDavid Sterba } 193017aaa434SDavid Sterba 193117aaa434SDavid Sterba /* Cancel running op */ 193217aaa434SDavid Sterba if (btrfs_exclop_start_try_lock(fs_info, type)) { 193317aaa434SDavid Sterba /* 193417aaa434SDavid Sterba * This blocks any exclop finish from setting it to NONE, so we 193517aaa434SDavid Sterba * request cancellation. Either it runs and we will wait for it, 193617aaa434SDavid Sterba * or it has finished and no waiting will happen. 193717aaa434SDavid Sterba */ 193817aaa434SDavid Sterba atomic_inc(&fs_info->reloc_cancel_req); 193917aaa434SDavid Sterba btrfs_exclop_start_unlock(fs_info); 194017aaa434SDavid Sterba 194117aaa434SDavid Sterba if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags)) 194217aaa434SDavid Sterba wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING, 194317aaa434SDavid Sterba TASK_INTERRUPTIBLE); 194417aaa434SDavid Sterba 194517aaa434SDavid Sterba return -ECANCELED; 194617aaa434SDavid Sterba } 194717aaa434SDavid Sterba 194817aaa434SDavid Sterba /* Something else is running or none */ 194917aaa434SDavid Sterba return -ENOTCONN; 195017aaa434SDavid Sterba } 195117aaa434SDavid Sterba 1952198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 195376dda93cSYan, Zheng void __user *arg) 1954f46b5a66SChristoph Hellwig { 1955562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 19560b246afaSJeff Mahoney struct inode *inode = file_inode(file); 19570b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1958f46b5a66SChristoph Hellwig u64 new_size; 1959f46b5a66SChristoph Hellwig u64 old_size; 1960f46b5a66SChristoph Hellwig u64 devid = 1; 19610b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1962f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1963f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1964f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1965f46b5a66SChristoph Hellwig char *sizestr; 19669a40f122SGui Hecheng char *retptr; 1967f46b5a66SChristoph Hellwig char *devstr = NULL; 1968f46b5a66SChristoph Hellwig int ret = 0; 1969f46b5a66SChristoph Hellwig int mod = 0; 1970bb059a37SDavid Sterba bool cancel; 1971f46b5a66SChristoph Hellwig 1972e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1973e441d54dSChris Mason return -EPERM; 1974e441d54dSChris Mason 1975198605a8SMiao Xie ret = mnt_want_write_file(file); 1976198605a8SMiao Xie if (ret) 1977198605a8SMiao Xie return ret; 1978198605a8SMiao Xie 1979bb059a37SDavid Sterba /* 1980bb059a37SDavid Sterba * Read the arguments before checking exclusivity to be able to 1981bb059a37SDavid Sterba * distinguish regular resize and cancel 1982bb059a37SDavid Sterba */ 1983dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1984c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1985c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1986bb059a37SDavid Sterba goto out_drop; 1987c9e9f97bSIlya Dryomov } 19885516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1989f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1990bb059a37SDavid Sterba cancel = (strcmp("cancel", sizestr) == 0); 1991bb059a37SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel); 1992bb059a37SDavid Sterba if (ret) 1993bb059a37SDavid Sterba goto out_free; 1994bb059a37SDavid Sterba /* Exclusive operation is now claimed */ 1995bb059a37SDavid Sterba 1996f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1997f46b5a66SChristoph Hellwig if (devstr) { 1998f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1999f46b5a66SChristoph Hellwig *devstr = '\0'; 2000f46b5a66SChristoph Hellwig devstr = vol_args->name; 200158dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 200258dfae63SZhangZhen if (ret) 2003bb059a37SDavid Sterba goto out_finish; 2004dfd79829SMiao Xie if (!devid) { 2005dfd79829SMiao Xie ret = -EINVAL; 2006bb059a37SDavid Sterba goto out_finish; 2007dfd79829SMiao Xie } 20080b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 2009f46b5a66SChristoph Hellwig } 2010dba60f3fSMiao Xie 2011562d7b15SJosef Bacik args.devid = devid; 2012562d7b15SJosef Bacik device = btrfs_find_device(fs_info->fs_devices, &args); 2013f46b5a66SChristoph Hellwig if (!device) { 20140b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 2015c1c9ff7cSGeert Uytterhoeven devid); 2016dfd79829SMiao Xie ret = -ENODEV; 2017bb059a37SDavid Sterba goto out_finish; 2018f46b5a66SChristoph Hellwig } 2019dba60f3fSMiao Xie 2020ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 20210b246afaSJeff Mahoney btrfs_info(fs_info, 2022efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 2023c1c9ff7cSGeert Uytterhoeven devid); 2024dfd79829SMiao Xie ret = -EPERM; 2025bb059a37SDavid Sterba goto out_finish; 20264e42ae1bSLiu Bo } 20274e42ae1bSLiu Bo 2028f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 2029cda00ebaSChristoph Hellwig new_size = bdev_nr_bytes(device->bdev); 2030f46b5a66SChristoph Hellwig else { 2031f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 2032f46b5a66SChristoph Hellwig mod = -1; 2033f46b5a66SChristoph Hellwig sizestr++; 2034f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 2035f46b5a66SChristoph Hellwig mod = 1; 2036f46b5a66SChristoph Hellwig sizestr++; 2037f46b5a66SChristoph Hellwig } 20389a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 20399a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 2040f46b5a66SChristoph Hellwig ret = -EINVAL; 2041bb059a37SDavid Sterba goto out_finish; 2042f46b5a66SChristoph Hellwig } 2043f46b5a66SChristoph Hellwig } 2044f46b5a66SChristoph Hellwig 2045401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 2046dfd79829SMiao Xie ret = -EPERM; 2047bb059a37SDavid Sterba goto out_finish; 204863a212abSStefan Behrens } 204963a212abSStefan Behrens 20507cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 2051f46b5a66SChristoph Hellwig 2052f46b5a66SChristoph Hellwig if (mod < 0) { 2053f46b5a66SChristoph Hellwig if (new_size > old_size) { 2054f46b5a66SChristoph Hellwig ret = -EINVAL; 2055bb059a37SDavid Sterba goto out_finish; 2056f46b5a66SChristoph Hellwig } 2057f46b5a66SChristoph Hellwig new_size = old_size - new_size; 2058f46b5a66SChristoph Hellwig } else if (mod > 0) { 2059eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 2060902c68a4SGui Hecheng ret = -ERANGE; 2061bb059a37SDavid Sterba goto out_finish; 2062eb8052e0SWenliang Fan } 2063f46b5a66SChristoph Hellwig new_size = old_size + new_size; 2064f46b5a66SChristoph Hellwig } 2065f46b5a66SChristoph Hellwig 2066ee22184bSByongho Lee if (new_size < SZ_256M) { 2067f46b5a66SChristoph Hellwig ret = -EINVAL; 2068bb059a37SDavid Sterba goto out_finish; 2069f46b5a66SChristoph Hellwig } 2070cda00ebaSChristoph Hellwig if (new_size > bdev_nr_bytes(device->bdev)) { 2071f46b5a66SChristoph Hellwig ret = -EFBIG; 2072bb059a37SDavid Sterba goto out_finish; 2073f46b5a66SChristoph Hellwig } 2074f46b5a66SChristoph Hellwig 207547f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 2076f46b5a66SChristoph Hellwig 2077f46b5a66SChristoph Hellwig if (new_size > old_size) { 2078a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 207998d5dc13STsutomu Itoh if (IS_ERR(trans)) { 208098d5dc13STsutomu Itoh ret = PTR_ERR(trans); 2081bb059a37SDavid Sterba goto out_finish; 208298d5dc13STsutomu Itoh } 2083f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 20843a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 2085ece7d20eSMike Fleetwood } else if (new_size < old_size) { 2086f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 20870253f40eSjeff.liu } /* equal, nothing need to do */ 2088f46b5a66SChristoph Hellwig 2089faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 2090faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 2091faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 2092faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 2093faf8f7b9SMarcos Paulo de Souza old_size, new_size); 2094bb059a37SDavid Sterba out_finish: 2095bb059a37SDavid Sterba btrfs_exclop_finish(fs_info); 2096c9e9f97bSIlya Dryomov out_free: 2097f46b5a66SChristoph Hellwig kfree(vol_args); 2098bb059a37SDavid Sterba out_drop: 209918f39c41SIlya Dryomov mnt_drop_write_file(file); 2100f46b5a66SChristoph Hellwig return ret; 2101f46b5a66SChristoph Hellwig } 2102f46b5a66SChristoph Hellwig 21035d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 21044d4340c9SChristian Brauner struct user_namespace *mnt_userns, 210552f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 21065d54c67eSNikolay Borisov bool readonly, 21078696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 2108f46b5a66SChristoph Hellwig { 2109f46b5a66SChristoph Hellwig int namelen; 21103de4586cSChris Mason int ret = 0; 2111f46b5a66SChristoph Hellwig 2112325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 2113325c50e3SJeff Mahoney return -ENOTDIR; 2114325c50e3SJeff Mahoney 2115a874a63eSLiu Bo ret = mnt_want_write_file(file); 2116a874a63eSLiu Bo if (ret) 2117a874a63eSLiu Bo goto out; 2118a874a63eSLiu Bo 211972fd032eSSage Weil namelen = strlen(name); 212072fd032eSSage Weil if (strchr(name, '/')) { 2121f46b5a66SChristoph Hellwig ret = -EINVAL; 2122a874a63eSLiu Bo goto out_drop_write; 2123f46b5a66SChristoph Hellwig } 2124f46b5a66SChristoph Hellwig 212516780cabSChris Mason if (name[0] == '.' && 212616780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 212716780cabSChris Mason ret = -EEXIST; 2128a874a63eSLiu Bo goto out_drop_write; 212916780cabSChris Mason } 213016780cabSChris Mason 21313de4586cSChris Mason if (subvol) { 21324d4340c9SChristian Brauner ret = btrfs_mksubvol(&file->f_path, mnt_userns, name, 21334d4340c9SChristian Brauner namelen, NULL, readonly, inherit); 2134cb8e7090SChristoph Hellwig } else { 21352903ff01SAl Viro struct fd src = fdget(fd); 21363de4586cSChris Mason struct inode *src_inode; 21372903ff01SAl Viro if (!src.file) { 21383de4586cSChris Mason ret = -EINVAL; 2139a874a63eSLiu Bo goto out_drop_write; 21403de4586cSChris Mason } 21413de4586cSChris Mason 2142496ad9aaSAl Viro src_inode = file_inode(src.file); 2143496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 2144c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 2145efe120a0SFrank Holton "Snapshot src from another FS"); 214623ad5b17SKusanagi Kouichi ret = -EXDEV; 21474d4340c9SChristian Brauner } else if (!inode_owner_or_capable(mnt_userns, src_inode)) { 2148d0242061SDavid Sterba /* 2149d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 2150d0242061SDavid Sterba * are limited to own subvolumes only 2151d0242061SDavid Sterba */ 2152d0242061SDavid Sterba ret = -EPERM; 2153ecd18815SAl Viro } else { 21544d4340c9SChristian Brauner ret = btrfs_mksnapshot(&file->f_path, mnt_userns, 21554d4340c9SChristian Brauner name, namelen, 215672fd032eSSage Weil BTRFS_I(src_inode)->root, 21575d54c67eSNikolay Borisov readonly, inherit); 2158ecd18815SAl Viro } 21592903ff01SAl Viro fdput(src); 2160cb8e7090SChristoph Hellwig } 2161a874a63eSLiu Bo out_drop_write: 2162a874a63eSLiu Bo mnt_drop_write_file(file); 2163f46b5a66SChristoph Hellwig out: 216472fd032eSSage Weil return ret; 216572fd032eSSage Weil } 216672fd032eSSage Weil 216772fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 2168fa0d2b9bSLi Zefan void __user *arg, int subvol) 216972fd032eSSage Weil { 2170fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 217172fd032eSSage Weil int ret; 217272fd032eSSage Weil 2173325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 2174325c50e3SJeff Mahoney return -ENOTDIR; 2175325c50e3SJeff Mahoney 2176fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2177fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 2178fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 2179fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2180fa0d2b9bSLi Zefan 21814d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 21824d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 21834d4340c9SChristian Brauner false, NULL); 2184fa0d2b9bSLi Zefan 2185fa0d2b9bSLi Zefan kfree(vol_args); 2186fa0d2b9bSLi Zefan return ret; 2187fa0d2b9bSLi Zefan } 2188fa0d2b9bSLi Zefan 2189fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 2190fa0d2b9bSLi Zefan void __user *arg, int subvol) 2191fa0d2b9bSLi Zefan { 2192fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 2193fa0d2b9bSLi Zefan int ret; 2194b83cc969SLi Zefan bool readonly = false; 21956f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 219672fd032eSSage Weil 2197325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 2198325c50e3SJeff Mahoney return -ENOTDIR; 2199325c50e3SJeff Mahoney 2200fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2201fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 2202fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 2203fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 2204fdfb1e4fSLi Zefan 2205673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 2206b83cc969SLi Zefan ret = -EOPNOTSUPP; 2207c47ca32dSDan Carpenter goto free_args; 2208fdfb1e4fSLi Zefan } 2209fdfb1e4fSLi Zefan 2210b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 2211b83cc969SLi Zefan readonly = true; 22126f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 22135011c5a6SDan Carpenter u64 nums; 22145011c5a6SDan Carpenter 22155011c5a6SDan Carpenter if (vol_args->size < sizeof(*inherit) || 22165011c5a6SDan Carpenter vol_args->size > PAGE_SIZE) { 22176f72c7e2SArne Jansen ret = -EINVAL; 2218c47ca32dSDan Carpenter goto free_args; 22196f72c7e2SArne Jansen } 22206f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 22216f72c7e2SArne Jansen if (IS_ERR(inherit)) { 22226f72c7e2SArne Jansen ret = PTR_ERR(inherit); 2223c47ca32dSDan Carpenter goto free_args; 22246f72c7e2SArne Jansen } 22255011c5a6SDan Carpenter 22265011c5a6SDan Carpenter if (inherit->num_qgroups > PAGE_SIZE || 22275011c5a6SDan Carpenter inherit->num_ref_copies > PAGE_SIZE || 22285011c5a6SDan Carpenter inherit->num_excl_copies > PAGE_SIZE) { 22295011c5a6SDan Carpenter ret = -EINVAL; 22305011c5a6SDan Carpenter goto free_inherit; 22315011c5a6SDan Carpenter } 22325011c5a6SDan Carpenter 22335011c5a6SDan Carpenter nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + 22345011c5a6SDan Carpenter 2 * inherit->num_excl_copies; 22355011c5a6SDan Carpenter if (vol_args->size != struct_size(inherit, qgroups, nums)) { 22365011c5a6SDan Carpenter ret = -EINVAL; 22375011c5a6SDan Carpenter goto free_inherit; 22385011c5a6SDan Carpenter } 22396f72c7e2SArne Jansen } 224075eaa0e2SSage Weil 22414d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 22424d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 22434d4340c9SChristian Brauner readonly, inherit); 2244c47ca32dSDan Carpenter if (ret) 2245c47ca32dSDan Carpenter goto free_inherit; 2246c47ca32dSDan Carpenter free_inherit: 22476f72c7e2SArne Jansen kfree(inherit); 2248c47ca32dSDan Carpenter free_args: 2249c47ca32dSDan Carpenter kfree(vol_args); 2250f46b5a66SChristoph Hellwig return ret; 2251f46b5a66SChristoph Hellwig } 2252f46b5a66SChristoph Hellwig 22539ad12305SSahil Kang static noinline int btrfs_ioctl_subvol_getflags(struct inode *inode, 22540caa102dSLi Zefan void __user *arg) 22550caa102dSLi Zefan { 22560b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 22570caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 22580caa102dSLi Zefan int ret = 0; 22590caa102dSLi Zefan u64 flags = 0; 22600caa102dSLi Zefan 22614a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 22620caa102dSLi Zefan return -EINVAL; 22630caa102dSLi Zefan 22640b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 22650caa102dSLi Zefan if (btrfs_root_readonly(root)) 22660caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 22670b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 22680caa102dSLi Zefan 22690caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 22700caa102dSLi Zefan ret = -EFAULT; 22710caa102dSLi Zefan 22720caa102dSLi Zefan return ret; 22730caa102dSLi Zefan } 22740caa102dSLi Zefan 22750caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 22760caa102dSLi Zefan void __user *arg) 22770caa102dSLi Zefan { 2278496ad9aaSAl Viro struct inode *inode = file_inode(file); 22790b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 22800caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 22810caa102dSLi Zefan struct btrfs_trans_handle *trans; 22820caa102dSLi Zefan u64 root_flags; 22830caa102dSLi Zefan u64 flags; 22840caa102dSLi Zefan int ret = 0; 22850caa102dSLi Zefan 228639e1674fSChristian Brauner if (!inode_owner_or_capable(file_mnt_user_ns(file), inode)) 2287bd60ea0fSDavid Sterba return -EPERM; 2288bd60ea0fSDavid Sterba 2289b9ca0664SLiu Bo ret = mnt_want_write_file(file); 2290b9ca0664SLiu Bo if (ret) 2291b9ca0664SLiu Bo goto out; 22920caa102dSLi Zefan 22934a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 2294b9ca0664SLiu Bo ret = -EINVAL; 2295b9ca0664SLiu Bo goto out_drop_write; 2296b9ca0664SLiu Bo } 22970caa102dSLi Zefan 2298b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 2299b9ca0664SLiu Bo ret = -EFAULT; 2300b9ca0664SLiu Bo goto out_drop_write; 2301b9ca0664SLiu Bo } 23020caa102dSLi Zefan 2303b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 2304b9ca0664SLiu Bo ret = -EOPNOTSUPP; 2305b9ca0664SLiu Bo goto out_drop_write; 2306b9ca0664SLiu Bo } 23070caa102dSLi Zefan 23080b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 23090caa102dSLi Zefan 23100caa102dSLi Zefan /* nothing to do */ 23110caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 2312b9ca0664SLiu Bo goto out_drop_sem; 23130caa102dSLi Zefan 23140caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 23152c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 23160caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 23170caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 23182c686537SDavid Sterba } else { 23192c686537SDavid Sterba /* 23202c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 23212c686537SDavid Sterba * send 23222c686537SDavid Sterba */ 23232c686537SDavid Sterba spin_lock(&root->root_item_lock); 23242c686537SDavid Sterba if (root->send_in_progress == 0) { 23250caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 23260caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 23272c686537SDavid Sterba spin_unlock(&root->root_item_lock); 23282c686537SDavid Sterba } else { 23292c686537SDavid Sterba spin_unlock(&root->root_item_lock); 23300b246afaSJeff Mahoney btrfs_warn(fs_info, 23312c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 23322c686537SDavid Sterba root->root_key.objectid); 23332c686537SDavid Sterba ret = -EPERM; 23342c686537SDavid Sterba goto out_drop_sem; 23352c686537SDavid Sterba } 23362c686537SDavid Sterba } 23370caa102dSLi Zefan 23380caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 23390caa102dSLi Zefan if (IS_ERR(trans)) { 23400caa102dSLi Zefan ret = PTR_ERR(trans); 23410caa102dSLi Zefan goto out_reset; 23420caa102dSLi Zefan } 23430caa102dSLi Zefan 23440b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 23450caa102dSLi Zefan &root->root_key, &root->root_item); 23469417ebc8SNikolay Borisov if (ret < 0) { 23479417ebc8SNikolay Borisov btrfs_end_transaction(trans); 23489417ebc8SNikolay Borisov goto out_reset; 23499417ebc8SNikolay Borisov } 23500caa102dSLi Zefan 23519417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 23529417ebc8SNikolay Borisov 23530caa102dSLi Zefan out_reset: 23540caa102dSLi Zefan if (ret) 23550caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 2356b9ca0664SLiu Bo out_drop_sem: 23570b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 2358b9ca0664SLiu Bo out_drop_write: 2359b9ca0664SLiu Bo mnt_drop_write_file(file); 2360b9ca0664SLiu Bo out: 23610caa102dSLi Zefan return ret; 23620caa102dSLi Zefan } 23630caa102dSLi Zefan 2364ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 2365ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 2366ac8e9819SChris Mason { 2367abc6e134SChris Mason struct btrfs_key test; 2368abc6e134SChris Mason int ret; 2369abc6e134SChris Mason 2370abc6e134SChris Mason test.objectid = sk->min_objectid; 2371abc6e134SChris Mason test.type = sk->min_type; 2372abc6e134SChris Mason test.offset = sk->min_offset; 2373abc6e134SChris Mason 2374abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2375abc6e134SChris Mason if (ret < 0) 2376ac8e9819SChris Mason return 0; 2377abc6e134SChris Mason 2378abc6e134SChris Mason test.objectid = sk->max_objectid; 2379abc6e134SChris Mason test.type = sk->max_type; 2380abc6e134SChris Mason test.offset = sk->max_offset; 2381abc6e134SChris Mason 2382abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2383abc6e134SChris Mason if (ret > 0) 2384ac8e9819SChris Mason return 0; 2385ac8e9819SChris Mason return 1; 2386ac8e9819SChris Mason } 2387ac8e9819SChris Mason 2388df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2389ac8e9819SChris Mason struct btrfs_key *key, 2390ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 23919b6e817dSGerhard Heift size_t *buf_size, 2392ba346b35SGerhard Heift char __user *ubuf, 2393ac8e9819SChris Mason unsigned long *sk_offset, 2394ac8e9819SChris Mason int *num_found) 2395ac8e9819SChris Mason { 2396ac8e9819SChris Mason u64 found_transid; 2397ac8e9819SChris Mason struct extent_buffer *leaf; 2398ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2399dd81d459SNaohiro Aota struct btrfs_key test; 2400ac8e9819SChris Mason unsigned long item_off; 2401ac8e9819SChris Mason unsigned long item_len; 2402ac8e9819SChris Mason int nritems; 2403ac8e9819SChris Mason int i; 2404ac8e9819SChris Mason int slot; 2405ac8e9819SChris Mason int ret = 0; 2406ac8e9819SChris Mason 2407ac8e9819SChris Mason leaf = path->nodes[0]; 2408ac8e9819SChris Mason slot = path->slots[0]; 2409ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2410ac8e9819SChris Mason 2411ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2412ac8e9819SChris Mason i = nritems; 2413ac8e9819SChris Mason goto advance_key; 2414ac8e9819SChris Mason } 2415ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2416ac8e9819SChris Mason 2417ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2418ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 24193212fa14SJosef Bacik item_len = btrfs_item_size(leaf, i); 2420ac8e9819SChris Mason 242103b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 242203b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 242303b71c6cSGabriel de Perthuis continue; 242403b71c6cSGabriel de Perthuis 24259b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 24268f5f6178SGerhard Heift if (*num_found) { 2427ac8e9819SChris Mason ret = 1; 24288f5f6178SGerhard Heift goto out; 24298f5f6178SGerhard Heift } 24308f5f6178SGerhard Heift 24318f5f6178SGerhard Heift /* 24328f5f6178SGerhard Heift * return one empty item back for v1, which does not 24338f5f6178SGerhard Heift * handle -EOVERFLOW 24348f5f6178SGerhard Heift */ 24358f5f6178SGerhard Heift 24369b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2437ac8e9819SChris Mason item_len = 0; 24388f5f6178SGerhard Heift ret = -EOVERFLOW; 24398f5f6178SGerhard Heift } 2440ac8e9819SChris Mason 24419b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2442ac8e9819SChris Mason ret = 1; 244325c9bc2eSGerhard Heift goto out; 2444ac8e9819SChris Mason } 2445ac8e9819SChris Mason 2446ac8e9819SChris Mason sh.objectid = key->objectid; 2447ac8e9819SChris Mason sh.offset = key->offset; 2448ac8e9819SChris Mason sh.type = key->type; 2449ac8e9819SChris Mason sh.len = item_len; 2450ac8e9819SChris Mason sh.transid = found_transid; 2451ac8e9819SChris Mason 2452a48b73ecSJosef Bacik /* 2453a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 2454a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 2455a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 2456a48b73ecSJosef Bacik * properly this next time through 2457a48b73ecSJosef Bacik */ 2458a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 2459a48b73ecSJosef Bacik ret = 0; 2460ba346b35SGerhard Heift goto out; 2461ba346b35SGerhard Heift } 2462ba346b35SGerhard Heift 2463ac8e9819SChris Mason *sk_offset += sizeof(sh); 2464ac8e9819SChris Mason 2465ac8e9819SChris Mason if (item_len) { 2466ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2467a48b73ecSJosef Bacik /* 2468a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 2469a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 2470a48b73ecSJosef Bacik */ 2471a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 2472ba346b35SGerhard Heift item_off, item_len)) { 2473a48b73ecSJosef Bacik ret = 0; 2474a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 2475ba346b35SGerhard Heift goto out; 2476ba346b35SGerhard Heift } 2477ba346b35SGerhard Heift 2478ac8e9819SChris Mason *sk_offset += item_len; 2479ac8e9819SChris Mason } 2480e2156867SHugo Mills (*num_found)++; 2481ac8e9819SChris Mason 24828f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 24838f5f6178SGerhard Heift goto out; 24848f5f6178SGerhard Heift 248525c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 248625c9bc2eSGerhard Heift ret = 1; 248725c9bc2eSGerhard Heift goto out; 248825c9bc2eSGerhard Heift } 2489ac8e9819SChris Mason } 2490ac8e9819SChris Mason advance_key: 2491ac8e9819SChris Mason ret = 0; 2492dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2493dd81d459SNaohiro Aota test.type = sk->max_type; 2494dd81d459SNaohiro Aota test.offset = sk->max_offset; 2495dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2496dd81d459SNaohiro Aota ret = 1; 2497dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2498abc6e134SChris Mason key->offset++; 2499dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2500abc6e134SChris Mason key->offset = 0; 2501abc6e134SChris Mason key->type++; 2502dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2503abc6e134SChris Mason key->offset = 0; 2504abc6e134SChris Mason key->type = 0; 2505abc6e134SChris Mason key->objectid++; 2506abc6e134SChris Mason } else 2507abc6e134SChris Mason ret = 1; 250825c9bc2eSGerhard Heift out: 2509ba346b35SGerhard Heift /* 2510ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2511ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2512ba346b35SGerhard Heift * * all items were found 2513ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2514ba346b35SGerhard Heift * leaf 2515ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2516ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2517ba346b35SGerhard Heift */ 2518ac8e9819SChris Mason return ret; 2519ac8e9819SChris Mason } 2520ac8e9819SChris Mason 2521ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 252212544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 25239b6e817dSGerhard Heift size_t *buf_size, 2524ba346b35SGerhard Heift char __user *ubuf) 2525ac8e9819SChris Mason { 25260b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2527ac8e9819SChris Mason struct btrfs_root *root; 2528ac8e9819SChris Mason struct btrfs_key key; 2529ac8e9819SChris Mason struct btrfs_path *path; 2530ac8e9819SChris Mason int ret; 2531ac8e9819SChris Mason int num_found = 0; 2532ac8e9819SChris Mason unsigned long sk_offset = 0; 2533ac8e9819SChris Mason 25349b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 25359b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 253612544442SGerhard Heift return -EOVERFLOW; 25379b6e817dSGerhard Heift } 253812544442SGerhard Heift 2539ac8e9819SChris Mason path = btrfs_alloc_path(); 2540ac8e9819SChris Mason if (!path) 2541ac8e9819SChris Mason return -ENOMEM; 2542ac8e9819SChris Mason 2543ac8e9819SChris Mason if (sk->tree_id == 0) { 2544ac8e9819SChris Mason /* search the root of the inode that was passed */ 254500246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2546ac8e9819SChris Mason } else { 254756e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2548ac8e9819SChris Mason if (IS_ERR(root)) { 2549ac8e9819SChris Mason btrfs_free_path(path); 2550ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2551ac8e9819SChris Mason } 2552ac8e9819SChris Mason } 2553ac8e9819SChris Mason 2554ac8e9819SChris Mason key.objectid = sk->min_objectid; 2555ac8e9819SChris Mason key.type = sk->min_type; 2556ac8e9819SChris Mason key.offset = sk->min_offset; 2557ac8e9819SChris Mason 2558ac8e9819SChris Mason while (1) { 2559bb523b40SAndreas Gruenbacher ret = -EFAULT; 2560bb523b40SAndreas Gruenbacher if (fault_in_writeable(ubuf + sk_offset, *buf_size - sk_offset)) 2561a48b73ecSJosef Bacik break; 2562a48b73ecSJosef Bacik 25636174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2564ac8e9819SChris Mason if (ret != 0) { 2565ac8e9819SChris Mason if (ret > 0) 2566ac8e9819SChris Mason ret = 0; 2567ac8e9819SChris Mason goto err; 2568ac8e9819SChris Mason } 2569df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2570ac8e9819SChris Mason &sk_offset, &num_found); 2571b3b4aa74SDavid Sterba btrfs_release_path(path); 257225c9bc2eSGerhard Heift if (ret) 2573ac8e9819SChris Mason break; 2574ac8e9819SChris Mason 2575ac8e9819SChris Mason } 25768f5f6178SGerhard Heift if (ret > 0) 2577ac8e9819SChris Mason ret = 0; 2578ac8e9819SChris Mason err: 2579ac8e9819SChris Mason sk->nr_items = num_found; 258000246528SJosef Bacik btrfs_put_root(root); 2581ac8e9819SChris Mason btrfs_free_path(path); 2582ac8e9819SChris Mason return ret; 2583ac8e9819SChris Mason } 2584ac8e9819SChris Mason 25859ad12305SSahil Kang static noinline int btrfs_ioctl_tree_search(struct inode *inode, 2586ac8e9819SChris Mason void __user *argp) 2587ac8e9819SChris Mason { 2588ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2589ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2590ac8e9819SChris Mason int ret; 25919b6e817dSGerhard Heift size_t buf_size; 2592ac8e9819SChris Mason 2593ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2594ac8e9819SChris Mason return -EPERM; 2595ac8e9819SChris Mason 2596ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2597ac8e9819SChris Mason 2598ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2599ba346b35SGerhard Heift return -EFAULT; 2600ba346b35SGerhard Heift 2601ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2602ac8e9819SChris Mason 2603ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 26048f5f6178SGerhard Heift 26058f5f6178SGerhard Heift /* 26068f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 26078f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 26088f5f6178SGerhard Heift */ 26098f5f6178SGerhard Heift if (ret == -EOVERFLOW) 26108f5f6178SGerhard Heift ret = 0; 26118f5f6178SGerhard Heift 2612ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2613ac8e9819SChris Mason ret = -EFAULT; 2614ac8e9819SChris Mason return ret; 2615ac8e9819SChris Mason } 2616ac8e9819SChris Mason 26179ad12305SSahil Kang static noinline int btrfs_ioctl_tree_search_v2(struct inode *inode, 2618cc68a8a5SGerhard Heift void __user *argp) 2619cc68a8a5SGerhard Heift { 2620cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2621cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2622cc68a8a5SGerhard Heift int ret; 2623cc68a8a5SGerhard Heift size_t buf_size; 2624ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2625cc68a8a5SGerhard Heift 2626cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2627cc68a8a5SGerhard Heift return -EPERM; 2628cc68a8a5SGerhard Heift 2629cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2630cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2631cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2632cc68a8a5SGerhard Heift return -EFAULT; 2633cc68a8a5SGerhard Heift 2634cc68a8a5SGerhard Heift buf_size = args.buf_size; 2635cc68a8a5SGerhard Heift 2636cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2637cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2638cc68a8a5SGerhard Heift buf_size = buf_limit; 2639cc68a8a5SGerhard Heift 2640cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2641718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2642cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2643cc68a8a5SGerhard Heift ret = -EFAULT; 2644cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2645cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2646cc68a8a5SGerhard Heift ret = -EFAULT; 2647cc68a8a5SGerhard Heift 264876dda93cSYan, Zheng return ret; 264976dda93cSYan, Zheng } 265076dda93cSYan, Zheng 265198d377a0STARUISI Hiroaki /* 2652ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2653ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 265498d377a0STARUISI Hiroaki */ 265598d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 265698d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 265798d377a0STARUISI Hiroaki { 265898d377a0STARUISI Hiroaki struct btrfs_root *root; 265998d377a0STARUISI Hiroaki struct btrfs_key key; 2660ac8e9819SChris Mason char *ptr; 266198d377a0STARUISI Hiroaki int ret = -1; 266298d377a0STARUISI Hiroaki int slot; 266398d377a0STARUISI Hiroaki int len; 266498d377a0STARUISI Hiroaki int total_len = 0; 266598d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 266698d377a0STARUISI Hiroaki struct extent_buffer *l; 266798d377a0STARUISI Hiroaki struct btrfs_path *path; 266898d377a0STARUISI Hiroaki 266998d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 267098d377a0STARUISI Hiroaki name[0]='\0'; 267198d377a0STARUISI Hiroaki return 0; 267298d377a0STARUISI Hiroaki } 267398d377a0STARUISI Hiroaki 267498d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 267598d377a0STARUISI Hiroaki if (!path) 267698d377a0STARUISI Hiroaki return -ENOMEM; 267798d377a0STARUISI Hiroaki 2678c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 267998d377a0STARUISI Hiroaki 268056e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 268198d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2682ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 268388234012SJosef Bacik root = NULL; 268488234012SJosef Bacik goto out; 268588234012SJosef Bacik } 268698d377a0STARUISI Hiroaki 268798d377a0STARUISI Hiroaki key.objectid = dirid; 268898d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 26898ad6fcabSChris Mason key.offset = (u64)-1; 269098d377a0STARUISI Hiroaki 269198d377a0STARUISI Hiroaki while (1) { 26920ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 269318674c6cSFilipe David Borba Manana if (ret < 0) 269418674c6cSFilipe David Borba Manana goto out; 269518674c6cSFilipe David Borba Manana else if (ret > 0) { 2696ac8e9819SChris Mason ret = -ENOENT; 269798d377a0STARUISI Hiroaki goto out; 2698ac8e9819SChris Mason } 269918674c6cSFilipe David Borba Manana 270018674c6cSFilipe David Borba Manana l = path->nodes[0]; 270118674c6cSFilipe David Borba Manana slot = path->slots[0]; 270298d377a0STARUISI Hiroaki 270398d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 270498d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 270598d377a0STARUISI Hiroaki ptr -= len + 1; 270698d377a0STARUISI Hiroaki total_len += len + 1; 2707a696cf35SFilipe David Borba Manana if (ptr < name) { 2708a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 270998d377a0STARUISI Hiroaki goto out; 2710a696cf35SFilipe David Borba Manana } 271198d377a0STARUISI Hiroaki 271298d377a0STARUISI Hiroaki *(ptr + len) = '/'; 271398d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 271498d377a0STARUISI Hiroaki 271598d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 271698d377a0STARUISI Hiroaki break; 271798d377a0STARUISI Hiroaki 2718b3b4aa74SDavid Sterba btrfs_release_path(path); 271998d377a0STARUISI Hiroaki key.objectid = key.offset; 27208ad6fcabSChris Mason key.offset = (u64)-1; 272198d377a0STARUISI Hiroaki dirid = key.objectid; 272298d377a0STARUISI Hiroaki } 272377906a50SLi Zefan memmove(name, ptr, total_len); 272498d377a0STARUISI Hiroaki name[total_len] = '\0'; 272598d377a0STARUISI Hiroaki ret = 0; 272698d377a0STARUISI Hiroaki out: 272700246528SJosef Bacik btrfs_put_root(root); 272898d377a0STARUISI Hiroaki btrfs_free_path(path); 2729ac8e9819SChris Mason return ret; 2730ac8e9819SChris Mason } 2731ac8e9819SChris Mason 27326623d9a0SChristian Brauner static int btrfs_search_path_in_tree_user(struct user_namespace *mnt_userns, 27336623d9a0SChristian Brauner struct inode *inode, 273423d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 273523d0b79dSTomohiro Misono { 273623d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 273723d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 273823d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 273923d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 274023d0b79dSTomohiro Misono u64 dirid = args->dirid; 274123d0b79dSTomohiro Misono unsigned long item_off; 274223d0b79dSTomohiro Misono unsigned long item_len; 274323d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 274423d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2745b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 274623d0b79dSTomohiro Misono struct btrfs_path *path; 274723d0b79dSTomohiro Misono struct btrfs_key key, key2; 274823d0b79dSTomohiro Misono struct extent_buffer *leaf; 274923d0b79dSTomohiro Misono struct inode *temp_inode; 275023d0b79dSTomohiro Misono char *ptr; 275123d0b79dSTomohiro Misono int slot; 275223d0b79dSTomohiro Misono int len; 275323d0b79dSTomohiro Misono int total_len = 0; 275423d0b79dSTomohiro Misono int ret; 275523d0b79dSTomohiro Misono 275623d0b79dSTomohiro Misono path = btrfs_alloc_path(); 275723d0b79dSTomohiro Misono if (!path) 275823d0b79dSTomohiro Misono return -ENOMEM; 275923d0b79dSTomohiro Misono 276023d0b79dSTomohiro Misono /* 276123d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 276223d0b79dSTomohiro Misono * construct the path in from the bottom up. 276323d0b79dSTomohiro Misono */ 276423d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 276523d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 276623d0b79dSTomohiro Misono 276756e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 276823d0b79dSTomohiro Misono if (IS_ERR(root)) { 276923d0b79dSTomohiro Misono ret = PTR_ERR(root); 277023d0b79dSTomohiro Misono goto out; 277123d0b79dSTomohiro Misono } 277223d0b79dSTomohiro Misono 277323d0b79dSTomohiro Misono key.objectid = dirid; 277423d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 277523d0b79dSTomohiro Misono key.offset = (u64)-1; 277623d0b79dSTomohiro Misono while (1) { 27770ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 27780ff40a91SMarcos Paulo de Souza if (ret < 0) 2779b8a49ae1SJosef Bacik goto out_put; 27800ff40a91SMarcos Paulo de Souza else if (ret > 0) { 278123d0b79dSTomohiro Misono ret = -ENOENT; 2782b8a49ae1SJosef Bacik goto out_put; 278323d0b79dSTomohiro Misono } 278423d0b79dSTomohiro Misono 278523d0b79dSTomohiro Misono leaf = path->nodes[0]; 278623d0b79dSTomohiro Misono slot = path->slots[0]; 278723d0b79dSTomohiro Misono 278823d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 278923d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 279023d0b79dSTomohiro Misono ptr -= len + 1; 279123d0b79dSTomohiro Misono total_len += len + 1; 279223d0b79dSTomohiro Misono if (ptr < args->path) { 279323d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2794b8a49ae1SJosef Bacik goto out_put; 279523d0b79dSTomohiro Misono } 279623d0b79dSTomohiro Misono 279723d0b79dSTomohiro Misono *(ptr + len) = '/'; 279823d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 279923d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 280023d0b79dSTomohiro Misono 280123d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 280223d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 280323d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 280423d0b79dSTomohiro Misono if (ret < 0) { 2805b8a49ae1SJosef Bacik goto out_put; 280623d0b79dSTomohiro Misono } else if (ret > 0) { 280723d0b79dSTomohiro Misono ret = -ENOENT; 2808b8a49ae1SJosef Bacik goto out_put; 280923d0b79dSTomohiro Misono } 281023d0b79dSTomohiro Misono 281123d0b79dSTomohiro Misono leaf = path->nodes[0]; 281223d0b79dSTomohiro Misono slot = path->slots[0]; 281323d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 281423d0b79dSTomohiro Misono if (key2.objectid != dirid) { 281523d0b79dSTomohiro Misono ret = -ENOENT; 2816b8a49ae1SJosef Bacik goto out_put; 281723d0b79dSTomohiro Misono } 281823d0b79dSTomohiro Misono 28190202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 28203ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 28213ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2822b8a49ae1SJosef Bacik goto out_put; 28233ca57bd6SMisono Tomohiro } 28246623d9a0SChristian Brauner ret = inode_permission(mnt_userns, temp_inode, 282547291baaSChristian Brauner MAY_READ | MAY_EXEC); 282623d0b79dSTomohiro Misono iput(temp_inode); 282723d0b79dSTomohiro Misono if (ret) { 282823d0b79dSTomohiro Misono ret = -EACCES; 2829b8a49ae1SJosef Bacik goto out_put; 283023d0b79dSTomohiro Misono } 283123d0b79dSTomohiro Misono 283223d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 283323d0b79dSTomohiro Misono break; 283423d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 283523d0b79dSTomohiro Misono ret = -EACCES; 2836b8a49ae1SJosef Bacik goto out_put; 283723d0b79dSTomohiro Misono } 283823d0b79dSTomohiro Misono 283923d0b79dSTomohiro Misono btrfs_release_path(path); 284023d0b79dSTomohiro Misono key.objectid = key.offset; 284123d0b79dSTomohiro Misono key.offset = (u64)-1; 284223d0b79dSTomohiro Misono dirid = key.objectid; 284323d0b79dSTomohiro Misono } 284423d0b79dSTomohiro Misono 284523d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 284623d0b79dSTomohiro Misono args->path[total_len] = '\0'; 284700246528SJosef Bacik btrfs_put_root(root); 2848b8a49ae1SJosef Bacik root = NULL; 284923d0b79dSTomohiro Misono btrfs_release_path(path); 285023d0b79dSTomohiro Misono } 285123d0b79dSTomohiro Misono 285223d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 285323d0b79dSTomohiro Misono key.objectid = treeid; 285423d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 285523d0b79dSTomohiro Misono key.offset = args->treeid; 2856b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 285723d0b79dSTomohiro Misono if (ret < 0) { 285823d0b79dSTomohiro Misono goto out; 285923d0b79dSTomohiro Misono } else if (ret > 0) { 286023d0b79dSTomohiro Misono ret = -ENOENT; 286123d0b79dSTomohiro Misono goto out; 286223d0b79dSTomohiro Misono } 286323d0b79dSTomohiro Misono 286423d0b79dSTomohiro Misono leaf = path->nodes[0]; 286523d0b79dSTomohiro Misono slot = path->slots[0]; 286623d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 286723d0b79dSTomohiro Misono 286823d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 28693212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot); 287023d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 287123d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 287223d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 287323d0b79dSTomohiro Misono ret = -EINVAL; 287423d0b79dSTomohiro Misono goto out; 287523d0b79dSTomohiro Misono } 287623d0b79dSTomohiro Misono 287723d0b79dSTomohiro Misono /* Copy subvolume's name */ 287823d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 287923d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 288023d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 288123d0b79dSTomohiro Misono args->name[item_len] = 0; 288223d0b79dSTomohiro Misono 2883b8a49ae1SJosef Bacik out_put: 288400246528SJosef Bacik btrfs_put_root(root); 288523d0b79dSTomohiro Misono out: 288623d0b79dSTomohiro Misono btrfs_free_path(path); 288723d0b79dSTomohiro Misono return ret; 288823d0b79dSTomohiro Misono } 288923d0b79dSTomohiro Misono 2890dc408ccdSSahil Kang static noinline int btrfs_ioctl_ino_lookup(struct btrfs_root *root, 2891ac8e9819SChris Mason void __user *argp) 2892ac8e9819SChris Mason { 2893ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 289401b810b8SDavid Sterba int ret = 0; 2895ac8e9819SChris Mason 28962354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 28972354d08fSJulia Lawall if (IS_ERR(args)) 28982354d08fSJulia Lawall return PTR_ERR(args); 2899c2b96929SDan Carpenter 290001b810b8SDavid Sterba /* 290101b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 290201b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 290301b810b8SDavid Sterba */ 29041b53ac4dSChris Mason if (args->treeid == 0) 2905dc408ccdSSahil Kang args->treeid = root->root_key.objectid; 29061b53ac4dSChris Mason 290701b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 290801b810b8SDavid Sterba args->name[0] = 0; 290901b810b8SDavid Sterba goto out; 291001b810b8SDavid Sterba } 291101b810b8SDavid Sterba 291201b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 291301b810b8SDavid Sterba ret = -EPERM; 291401b810b8SDavid Sterba goto out; 291501b810b8SDavid Sterba } 291601b810b8SDavid Sterba 2917dc408ccdSSahil Kang ret = btrfs_search_path_in_tree(root->fs_info, 2918ac8e9819SChris Mason args->treeid, args->objectid, 2919ac8e9819SChris Mason args->name); 2920ac8e9819SChris Mason 292101b810b8SDavid Sterba out: 2922ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2923ac8e9819SChris Mason ret = -EFAULT; 2924ac8e9819SChris Mason 2925ac8e9819SChris Mason kfree(args); 292698d377a0STARUISI Hiroaki return ret; 292798d377a0STARUISI Hiroaki } 292898d377a0STARUISI Hiroaki 292923d0b79dSTomohiro Misono /* 293023d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 293123d0b79dSTomohiro Misono * 293223d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 293323d0b79dSTomohiro Misono * 293423d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 293523d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 293623d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 293723d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 293823d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 293923d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 294023d0b79dSTomohiro Misono */ 294123d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 294223d0b79dSTomohiro Misono { 294323d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 294423d0b79dSTomohiro Misono struct inode *inode; 294523d0b79dSTomohiro Misono int ret; 294623d0b79dSTomohiro Misono 294723d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 294823d0b79dSTomohiro Misono if (IS_ERR(args)) 294923d0b79dSTomohiro Misono return PTR_ERR(args); 295023d0b79dSTomohiro Misono 295123d0b79dSTomohiro Misono inode = file_inode(file); 295223d0b79dSTomohiro Misono 295323d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 295423d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 295523d0b79dSTomohiro Misono /* 295623d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 295723d0b79dSTomohiro Misono * called 295823d0b79dSTomohiro Misono */ 295923d0b79dSTomohiro Misono kfree(args); 296023d0b79dSTomohiro Misono return -EACCES; 296123d0b79dSTomohiro Misono } 296223d0b79dSTomohiro Misono 29636623d9a0SChristian Brauner ret = btrfs_search_path_in_tree_user(file_mnt_user_ns(file), inode, args); 296423d0b79dSTomohiro Misono 296523d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 296623d0b79dSTomohiro Misono ret = -EFAULT; 296723d0b79dSTomohiro Misono 296823d0b79dSTomohiro Misono kfree(args); 296923d0b79dSTomohiro Misono return ret; 297023d0b79dSTomohiro Misono } 297123d0b79dSTomohiro Misono 2972b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 29739ad12305SSahil Kang static int btrfs_ioctl_get_subvol_info(struct inode *inode, void __user *argp) 2974b64ec075STomohiro Misono { 2975b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2976b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2977b64ec075STomohiro Misono struct btrfs_root *root; 2978b64ec075STomohiro Misono struct btrfs_path *path; 2979b64ec075STomohiro Misono struct btrfs_key key; 2980b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2981b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2982b64ec075STomohiro Misono struct extent_buffer *leaf; 2983b64ec075STomohiro Misono unsigned long item_off; 2984b64ec075STomohiro Misono unsigned long item_len; 2985b64ec075STomohiro Misono int slot; 2986b64ec075STomohiro Misono int ret = 0; 2987b64ec075STomohiro Misono 2988b64ec075STomohiro Misono path = btrfs_alloc_path(); 2989b64ec075STomohiro Misono if (!path) 2990b64ec075STomohiro Misono return -ENOMEM; 2991b64ec075STomohiro Misono 2992b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2993b64ec075STomohiro Misono if (!subvol_info) { 2994b64ec075STomohiro Misono btrfs_free_path(path); 2995b64ec075STomohiro Misono return -ENOMEM; 2996b64ec075STomohiro Misono } 2997b64ec075STomohiro Misono 2998b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2999b64ec075STomohiro Misono 3000b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 3001b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 300256e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 3003b64ec075STomohiro Misono if (IS_ERR(root)) { 3004b64ec075STomohiro Misono ret = PTR_ERR(root); 300504734e84SJosef Bacik goto out_free; 300604734e84SJosef Bacik } 3007b64ec075STomohiro Misono root_item = &root->root_item; 3008b64ec075STomohiro Misono 3009b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 3010b64ec075STomohiro Misono 3011b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 3012b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 3013b64ec075STomohiro Misono 3014b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 3015b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 3016b64ec075STomohiro Misono BTRFS_UUID_SIZE); 3017b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 3018b64ec075STomohiro Misono BTRFS_UUID_SIZE); 3019b64ec075STomohiro Misono 3020b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 3021b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 3022b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 3023b64ec075STomohiro Misono 3024b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 3025b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 3026b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 3027b64ec075STomohiro Misono 3028b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 3029b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 3030b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 3031b64ec075STomohiro Misono 3032b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 3033b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 3034b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 3035b64ec075STomohiro Misono 3036b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 3037b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 3038b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 3039b64ec075STomohiro Misono key.offset = 0; 304004734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 3041b64ec075STomohiro Misono if (ret < 0) { 3042b64ec075STomohiro Misono goto out; 3043b64ec075STomohiro Misono } else if (path->slots[0] >= 3044b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 304504734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 3046b64ec075STomohiro Misono if (ret < 0) { 3047b64ec075STomohiro Misono goto out; 3048b64ec075STomohiro Misono } else if (ret > 0) { 3049b64ec075STomohiro Misono ret = -EUCLEAN; 3050b64ec075STomohiro Misono goto out; 3051b64ec075STomohiro Misono } 3052b64ec075STomohiro Misono } 3053b64ec075STomohiro Misono 3054b64ec075STomohiro Misono leaf = path->nodes[0]; 3055b64ec075STomohiro Misono slot = path->slots[0]; 3056b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 3057b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 3058b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 3059b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 3060b64ec075STomohiro Misono 3061b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 3062b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 3063b64ec075STomohiro Misono 3064b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 3065b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 30663212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot) 3067b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 3068b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 3069b64ec075STomohiro Misono item_off, item_len); 3070b64ec075STomohiro Misono } else { 3071b64ec075STomohiro Misono ret = -ENOENT; 3072b64ec075STomohiro Misono goto out; 3073b64ec075STomohiro Misono } 3074b64ec075STomohiro Misono } 3075b64ec075STomohiro Misono 3076b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 3077b64ec075STomohiro Misono ret = -EFAULT; 3078b64ec075STomohiro Misono 3079b64ec075STomohiro Misono out: 308000246528SJosef Bacik btrfs_put_root(root); 308104734e84SJosef Bacik out_free: 3082b64ec075STomohiro Misono btrfs_free_path(path); 3083b091f7feSWaiman Long kfree(subvol_info); 3084b64ec075STomohiro Misono return ret; 3085b64ec075STomohiro Misono } 3086b64ec075STomohiro Misono 308742e4b520STomohiro Misono /* 308842e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 308942e4b520STomohiro Misono * except the subvolume name. 309042e4b520STomohiro Misono */ 30919ad12305SSahil Kang static int btrfs_ioctl_get_subvol_rootref(struct btrfs_root *root, 3092dc408ccdSSahil Kang void __user *argp) 309342e4b520STomohiro Misono { 309442e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 309542e4b520STomohiro Misono struct btrfs_root_ref *rref; 309642e4b520STomohiro Misono struct btrfs_path *path; 309742e4b520STomohiro Misono struct btrfs_key key; 309842e4b520STomohiro Misono struct extent_buffer *leaf; 309942e4b520STomohiro Misono u64 objectid; 310042e4b520STomohiro Misono int slot; 310142e4b520STomohiro Misono int ret; 310242e4b520STomohiro Misono u8 found; 310342e4b520STomohiro Misono 310442e4b520STomohiro Misono path = btrfs_alloc_path(); 310542e4b520STomohiro Misono if (!path) 310642e4b520STomohiro Misono return -ENOMEM; 310742e4b520STomohiro Misono 310842e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 310942e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 311042e4b520STomohiro Misono btrfs_free_path(path); 311142e4b520STomohiro Misono return PTR_ERR(rootrefs); 311242e4b520STomohiro Misono } 311342e4b520STomohiro Misono 31149ad12305SSahil Kang objectid = root->root_key.objectid; 311542e4b520STomohiro Misono key.objectid = objectid; 311642e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 311742e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 311842e4b520STomohiro Misono found = 0; 311942e4b520STomohiro Misono 31209ad12305SSahil Kang root = root->fs_info->tree_root; 312142e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 312242e4b520STomohiro Misono if (ret < 0) { 312342e4b520STomohiro Misono goto out; 312442e4b520STomohiro Misono } else if (path->slots[0] >= 312542e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 312642e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 312742e4b520STomohiro Misono if (ret < 0) { 312842e4b520STomohiro Misono goto out; 312942e4b520STomohiro Misono } else if (ret > 0) { 313042e4b520STomohiro Misono ret = -EUCLEAN; 313142e4b520STomohiro Misono goto out; 313242e4b520STomohiro Misono } 313342e4b520STomohiro Misono } 313442e4b520STomohiro Misono while (1) { 313542e4b520STomohiro Misono leaf = path->nodes[0]; 313642e4b520STomohiro Misono slot = path->slots[0]; 313742e4b520STomohiro Misono 313842e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 313942e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 314042e4b520STomohiro Misono ret = 0; 314142e4b520STomohiro Misono goto out; 314242e4b520STomohiro Misono } 314342e4b520STomohiro Misono 314442e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 314542e4b520STomohiro Misono ret = -EOVERFLOW; 314642e4b520STomohiro Misono goto out; 314742e4b520STomohiro Misono } 314842e4b520STomohiro Misono 314942e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 315042e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 315142e4b520STomohiro Misono rootrefs->rootref[found].dirid = 315242e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 315342e4b520STomohiro Misono found++; 315442e4b520STomohiro Misono 315542e4b520STomohiro Misono ret = btrfs_next_item(root, path); 315642e4b520STomohiro Misono if (ret < 0) { 315742e4b520STomohiro Misono goto out; 315842e4b520STomohiro Misono } else if (ret > 0) { 315942e4b520STomohiro Misono ret = -EUCLEAN; 316042e4b520STomohiro Misono goto out; 316142e4b520STomohiro Misono } 316242e4b520STomohiro Misono } 316342e4b520STomohiro Misono 316442e4b520STomohiro Misono out: 316542e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 316642e4b520STomohiro Misono rootrefs->num_items = found; 316742e4b520STomohiro Misono /* update min_treeid for next search */ 316842e4b520STomohiro Misono if (found) 316942e4b520STomohiro Misono rootrefs->min_treeid = 317042e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 317142e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 317242e4b520STomohiro Misono ret = -EFAULT; 317342e4b520STomohiro Misono } 317442e4b520STomohiro Misono 317542e4b520STomohiro Misono kfree(rootrefs); 317642e4b520STomohiro Misono btrfs_free_path(path); 317742e4b520STomohiro Misono 317842e4b520STomohiro Misono return ret; 317942e4b520STomohiro Misono } 318042e4b520STomohiro Misono 318176dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 3182949964c9SMarcos Paulo de Souza void __user *arg, 3183949964c9SMarcos Paulo de Souza bool destroy_v2) 318476dda93cSYan, Zheng { 318554563d41SAl Viro struct dentry *parent = file->f_path.dentry; 31860b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 318776dda93cSYan, Zheng struct dentry *dentry; 31882b0143b5SDavid Howells struct inode *dir = d_inode(parent); 318976dda93cSYan, Zheng struct inode *inode; 319076dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 319176dda93cSYan, Zheng struct btrfs_root *dest = NULL; 3192949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 3193949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 3194c4ed533bSChristian Brauner struct user_namespace *mnt_userns = file_mnt_user_ns(file); 3195949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 3196949964c9SMarcos Paulo de Souza int subvol_namelen; 319776dda93cSYan, Zheng int err = 0; 3198949964c9SMarcos Paulo de Souza bool destroy_parent = false; 319976dda93cSYan, Zheng 3200813febdbSJosef Bacik /* We don't support snapshots with extent tree v2 yet. */ 3201813febdbSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 3202813febdbSJosef Bacik btrfs_err(fs_info, 3203813febdbSJosef Bacik "extent tree v2 doesn't support snapshot deletion yet"); 3204813febdbSJosef Bacik return -EOPNOTSUPP; 3205813febdbSJosef Bacik } 3206813febdbSJosef Bacik 3207949964c9SMarcos Paulo de Souza if (destroy_v2) { 3208949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 3209949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 3210949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 3211325c50e3SJeff Mahoney 3212949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 3213949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 3214949964c9SMarcos Paulo de Souza goto out; 3215949964c9SMarcos Paulo de Souza } 321676dda93cSYan, Zheng 3217949964c9SMarcos Paulo de Souza /* 3218949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 3219949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 3220949964c9SMarcos Paulo de Souza */ 3221949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 3222949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 3223949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 3224949964c9SMarcos Paulo de Souza 3225949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3226949964c9SMarcos Paulo de Souza if (err) 3227949964c9SMarcos Paulo de Souza goto out; 3228949964c9SMarcos Paulo de Souza } else { 3229aabb34e7SChristian Brauner struct inode *old_dir; 3230c4ed533bSChristian Brauner 3231949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 323276dda93cSYan, Zheng err = -EINVAL; 323376dda93cSYan, Zheng goto out; 323476dda93cSYan, Zheng } 323576dda93cSYan, Zheng 3236a561be71SAl Viro err = mnt_want_write_file(file); 323776dda93cSYan, Zheng if (err) 323876dda93cSYan, Zheng goto out; 323976dda93cSYan, Zheng 3240949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 3241949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 3242949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 3243949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 3244949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 3245949964c9SMarcos Paulo de Souza goto out_drop_write; 3246949964c9SMarcos Paulo de Souza } 3247949964c9SMarcos Paulo de Souza 3248949964c9SMarcos Paulo de Souza /* 3249949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 3250949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 3251949964c9SMarcos Paulo de Souza */ 3252949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 3253949964c9SMarcos Paulo de Souza 3254949964c9SMarcos Paulo de Souza /* 3255949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 3256949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 3257949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 3258949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 3259949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 3260949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 3261949964c9SMarcos Paulo de Souza */ 3262949964c9SMarcos Paulo de Souza dput(dentry); 3263949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 3264949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 3265949964c9SMarcos Paulo de Souza goto out_drop_write; 3266949964c9SMarcos Paulo de Souza } 3267aabb34e7SChristian Brauner old_dir = dir; 3268949964c9SMarcos Paulo de Souza dir = d_inode(parent); 3269949964c9SMarcos Paulo de Souza 3270949964c9SMarcos Paulo de Souza /* 3271949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 3272949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 3273949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 3274949964c9SMarcos Paulo de Souza * new parent dentry. 3275949964c9SMarcos Paulo de Souza */ 3276949964c9SMarcos Paulo de Souza destroy_parent = true; 3277949964c9SMarcos Paulo de Souza 3278aabb34e7SChristian Brauner /* 3279aabb34e7SChristian Brauner * On idmapped mounts, deletion via subvolid is 3280aabb34e7SChristian Brauner * restricted to subvolumes that are immediate 3281aabb34e7SChristian Brauner * ancestors of the inode referenced by the file 3282aabb34e7SChristian Brauner * descriptor in the ioctl. Otherwise the idmapping 3283aabb34e7SChristian Brauner * could potentially be abused to delete subvolumes 3284aabb34e7SChristian Brauner * anywhere in the filesystem the user wouldn't be able 3285aabb34e7SChristian Brauner * to delete without an idmapped mount. 3286aabb34e7SChristian Brauner */ 3287aabb34e7SChristian Brauner if (old_dir != dir && mnt_userns != &init_user_ns) { 3288aabb34e7SChristian Brauner err = -EOPNOTSUPP; 3289aabb34e7SChristian Brauner goto free_parent; 3290aabb34e7SChristian Brauner } 3291aabb34e7SChristian Brauner 3292949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 3293949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 3294949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 3295949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 3296949964c9SMarcos Paulo de Souza goto free_parent; 3297949964c9SMarcos Paulo de Souza } 32981a9fd417SDavid Sterba /* subvol_name_ptr is already nul terminated */ 3299949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 3300949964c9SMarcos Paulo de Souza } 3301949964c9SMarcos Paulo de Souza } else { 3302949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 3303949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 3304949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 3305949964c9SMarcos Paulo de Souza 3306949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 3307949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 3308949964c9SMarcos Paulo de Souza 3309949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3310949964c9SMarcos Paulo de Souza if (err) 3311949964c9SMarcos Paulo de Souza goto out; 3312949964c9SMarcos Paulo de Souza } 3313949964c9SMarcos Paulo de Souza 3314949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 3315949964c9SMarcos Paulo de Souza 3316949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 3317949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 3318949964c9SMarcos Paulo de Souza err = -EINVAL; 3319949964c9SMarcos Paulo de Souza goto free_subvol_name; 3320949964c9SMarcos Paulo de Souza } 3321949964c9SMarcos Paulo de Souza 3322949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 3323949964c9SMarcos Paulo de Souza err = -ENOTDIR; 3324949964c9SMarcos Paulo de Souza goto free_subvol_name; 3325949964c9SMarcos Paulo de Souza } 3326521e0546SDavid Sterba 332700235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 332800235411SAl Viro if (err == -EINTR) 3329949964c9SMarcos Paulo de Souza goto free_subvol_name; 3330c4ed533bSChristian Brauner dentry = lookup_one(mnt_userns, subvol_name, parent, subvol_namelen); 333176dda93cSYan, Zheng if (IS_ERR(dentry)) { 333276dda93cSYan, Zheng err = PTR_ERR(dentry); 333376dda93cSYan, Zheng goto out_unlock_dir; 333476dda93cSYan, Zheng } 333576dda93cSYan, Zheng 33362b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 333776dda93cSYan, Zheng err = -ENOENT; 333876dda93cSYan, Zheng goto out_dput; 333976dda93cSYan, Zheng } 334076dda93cSYan, Zheng 33412b0143b5SDavid Howells inode = d_inode(dentry); 33424260f7c7SSage Weil dest = BTRFS_I(inode)->root; 33434260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 33444260f7c7SSage Weil /* 33454260f7c7SSage Weil * Regular user. Only allow this with a special mount 33464260f7c7SSage Weil * option, when the user has write+exec access to the 33474260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 33484260f7c7SSage Weil * allowed. 33494260f7c7SSage Weil * 33504260f7c7SSage Weil * Note that this is _not_ check that the subvol is 33514260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 33524260f7c7SSage Weil * otherwise be able to delete. 33534260f7c7SSage Weil * 33544260f7c7SSage Weil * Users who want to delete empty subvols should try 33554260f7c7SSage Weil * rmdir(2). 33564260f7c7SSage Weil */ 33574260f7c7SSage Weil err = -EPERM; 33580b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 33594260f7c7SSage Weil goto out_dput; 33604260f7c7SSage Weil 33614260f7c7SSage Weil /* 33624260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 33634260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 33644260f7c7SSage Weil * must be called on the dentry referencing the root 33654260f7c7SSage Weil * of the subvol, not a random directory contained 33664260f7c7SSage Weil * within it. 33674260f7c7SSage Weil */ 33684260f7c7SSage Weil err = -EINVAL; 33694260f7c7SSage Weil if (root == dest) 33704260f7c7SSage Weil goto out_dput; 33714260f7c7SSage Weil 3372c4ed533bSChristian Brauner err = inode_permission(mnt_userns, inode, MAY_WRITE | MAY_EXEC); 33734260f7c7SSage Weil if (err) 33744260f7c7SSage Weil goto out_dput; 33755c39da5bSMiao Xie } 33764260f7c7SSage Weil 33775c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 3378c4ed533bSChristian Brauner err = btrfs_may_delete(mnt_userns, dir, dentry, 1); 33794260f7c7SSage Weil if (err) 33804260f7c7SSage Weil goto out_dput; 33814260f7c7SSage Weil 33824a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 338376dda93cSYan, Zheng err = -EINVAL; 338476dda93cSYan, Zheng goto out_dput; 338576dda93cSYan, Zheng } 338676dda93cSYan, Zheng 338764708539SJosef Bacik btrfs_inode_lock(inode, 0); 3388f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 338964708539SJosef Bacik btrfs_inode_unlock(inode, 0); 3390a37d9a17SAmir Goldstein if (!err) 3391a37d9a17SAmir Goldstein d_delete_notify(dir, dentry); 3392fa6ac876SLiu Bo 339376dda93cSYan, Zheng out_dput: 339476dda93cSYan, Zheng dput(dentry); 339576dda93cSYan, Zheng out_unlock_dir: 339664708539SJosef Bacik btrfs_inode_unlock(dir, 0); 3397949964c9SMarcos Paulo de Souza free_subvol_name: 3398949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3399949964c9SMarcos Paulo de Souza free_parent: 3400949964c9SMarcos Paulo de Souza if (destroy_parent) 3401949964c9SMarcos Paulo de Souza dput(parent); 340200235411SAl Viro out_drop_write: 34032a79f17eSAl Viro mnt_drop_write_file(file); 340476dda93cSYan, Zheng out: 3405949964c9SMarcos Paulo de Souza kfree(vol_args2); 340676dda93cSYan, Zheng kfree(vol_args); 340776dda93cSYan, Zheng return err; 340876dda93cSYan, Zheng } 340976dda93cSYan, Zheng 34101e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3411f46b5a66SChristoph Hellwig { 3412496ad9aaSAl Viro struct inode *inode = file_inode(file); 3413f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3414c853a578SGoldwyn Rodrigues struct btrfs_ioctl_defrag_range_args range = {0}; 3415c146afadSYan Zheng int ret; 3416c146afadSYan Zheng 341725122d15SIlya Dryomov ret = mnt_want_write_file(file); 341825122d15SIlya Dryomov if (ret) 341925122d15SIlya Dryomov return ret; 3420b83cc969SLi Zefan 342125122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 342225122d15SIlya Dryomov ret = -EROFS; 342325122d15SIlya Dryomov goto out; 34245ac00addSStefan Behrens } 3425f46b5a66SChristoph Hellwig 3426f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3427f46b5a66SChristoph Hellwig case S_IFDIR: 3428e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3429e441d54dSChris Mason ret = -EPERM; 3430e441d54dSChris Mason goto out; 3431e441d54dSChris Mason } 3432de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3433f46b5a66SChristoph Hellwig break; 3434f46b5a66SChristoph Hellwig case S_IFREG: 3435616d374eSAdam Borowski /* 3436616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3437616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3438616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3439616d374eSAdam Borowski */ 3440616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 344147291baaSChristian Brauner inode_permission(&init_user_ns, inode, MAY_WRITE)) { 3442616d374eSAdam Borowski ret = -EPERM; 3443e441d54dSChris Mason goto out; 3444e441d54dSChris Mason } 34451e701a32SChris Mason 34461e701a32SChris Mason if (argp) { 3447c853a578SGoldwyn Rodrigues if (copy_from_user(&range, argp, sizeof(range))) { 34481e701a32SChris Mason ret = -EFAULT; 3449683be16eSDan Carpenter goto out; 34501e701a32SChris Mason } 34511e701a32SChris Mason /* compression requires us to start the IO */ 3452c853a578SGoldwyn Rodrigues if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 3453c853a578SGoldwyn Rodrigues range.flags |= BTRFS_DEFRAG_RANGE_START_IO; 3454c853a578SGoldwyn Rodrigues range.extent_thresh = (u32)-1; 34551e701a32SChris Mason } 34561e701a32SChris Mason } else { 34571e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 3458c853a578SGoldwyn Rodrigues range.len = (u64)-1; 34591e701a32SChris Mason } 34601ccc2e8aSQu Wenruo ret = btrfs_defrag_file(file_inode(file), &file->f_ra, 3461c853a578SGoldwyn Rodrigues &range, BTRFS_OLDEST_GENERATION, 0); 34624cb5300bSChris Mason if (ret > 0) 34634cb5300bSChris Mason ret = 0; 3464f46b5a66SChristoph Hellwig break; 34658929ecfaSYan, Zheng default: 34668929ecfaSYan, Zheng ret = -EINVAL; 3467f46b5a66SChristoph Hellwig } 3468e441d54dSChris Mason out: 346925122d15SIlya Dryomov mnt_drop_write_file(file); 3470e441d54dSChris Mason return ret; 3471f46b5a66SChristoph Hellwig } 3472f46b5a66SChristoph Hellwig 34732ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3474f46b5a66SChristoph Hellwig { 3475f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3476a174c0a2SNikolay Borisov bool restore_op = false; 3477f46b5a66SChristoph Hellwig int ret; 3478f46b5a66SChristoph Hellwig 3479e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3480e441d54dSChris Mason return -EPERM; 3481e441d54dSChris Mason 3482914a519bSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 3483914a519bSJosef Bacik btrfs_err(fs_info, "device add not supported on extent tree v2 yet"); 3484914a519bSJosef Bacik return -EINVAL; 3485914a519bSJosef Bacik } 3486914a519bSJosef Bacik 3487a174c0a2SNikolay Borisov if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) { 3488a174c0a2SNikolay Borisov if (!btrfs_exclop_start_try_lock(fs_info, BTRFS_EXCLOP_DEV_ADD)) 3489e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3490c9e9f97bSIlya Dryomov 3491a174c0a2SNikolay Borisov /* 3492a174c0a2SNikolay Borisov * We can do the device add because we have a paused balanced, 3493a174c0a2SNikolay Borisov * change the exclusive op type and remember we should bring 3494a174c0a2SNikolay Borisov * back the paused balance 3495a174c0a2SNikolay Borisov */ 3496a174c0a2SNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_DEV_ADD; 3497a174c0a2SNikolay Borisov btrfs_exclop_start_unlock(fs_info); 3498a174c0a2SNikolay Borisov restore_op = true; 3499a174c0a2SNikolay Borisov } 3500a174c0a2SNikolay Borisov 3501dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3502c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3503c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3504c9e9f97bSIlya Dryomov goto out; 3505c9e9f97bSIlya Dryomov } 3506f46b5a66SChristoph Hellwig 35075516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 35082ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3509f46b5a66SChristoph Hellwig 351043d20761SAnand Jain if (!ret) 35110b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 351243d20761SAnand Jain 3513f46b5a66SChristoph Hellwig kfree(vol_args); 3514c9e9f97bSIlya Dryomov out: 3515a174c0a2SNikolay Borisov if (restore_op) 3516a174c0a2SNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED); 3517a174c0a2SNikolay Borisov else 3518c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3519f46b5a66SChristoph Hellwig return ret; 3520f46b5a66SChristoph Hellwig } 3521f46b5a66SChristoph Hellwig 35226b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3523f46b5a66SChristoph Hellwig { 35241a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 35250b246afaSJeff Mahoney struct inode *inode = file_inode(file); 35260b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 35276b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 35283fa421deSJosef Bacik struct block_device *bdev = NULL; 35293fa421deSJosef Bacik fmode_t mode; 3530f46b5a66SChristoph Hellwig int ret; 353167ae34b6SDavid Sterba bool cancel = false; 3532f46b5a66SChristoph Hellwig 3533e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3534e441d54dSChris Mason return -EPERM; 3535e441d54dSChris Mason 3536dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3537d815b3f2SDan Carpenter if (IS_ERR(vol_args)) 3538d815b3f2SDan Carpenter return PTR_ERR(vol_args); 3539f46b5a66SChristoph Hellwig 3540748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3541fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3542fd4e994bSOmar Sandoval goto out; 3543fd4e994bSOmar Sandoval } 35441a15eb72SJosef Bacik 35456b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 35461a15eb72SJosef Bacik if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 35471a15eb72SJosef Bacik args.devid = vol_args->devid; 35481a15eb72SJosef Bacik } else if (!strcmp("cancel", vol_args->name)) { 354967ae34b6SDavid Sterba cancel = true; 35501a15eb72SJosef Bacik } else { 35511a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 35521a15eb72SJosef Bacik if (ret) 35531a15eb72SJosef Bacik goto out; 35541a15eb72SJosef Bacik } 35551a15eb72SJosef Bacik 35561a15eb72SJosef Bacik ret = mnt_want_write_file(file); 35571a15eb72SJosef Bacik if (ret) 35581a15eb72SJosef Bacik goto out; 355967ae34b6SDavid Sterba 356067ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 356167ae34b6SDavid Sterba cancel); 356267ae34b6SDavid Sterba if (ret) 35631a15eb72SJosef Bacik goto err_drop; 356467ae34b6SDavid Sterba 35651a15eb72SJosef Bacik /* Exclusive operation is now claimed */ 35661a15eb72SJosef Bacik ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); 356767ae34b6SDavid Sterba 3568c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3569183860f6SAnand Jain 35706b526ed7SAnand Jain if (!ret) { 3571735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 35720b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 35736b526ed7SAnand Jain vol_args->devid); 35746b526ed7SAnand Jain else 35750b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 35766b526ed7SAnand Jain vol_args->name); 35776b526ed7SAnand Jain } 3578c47ca32dSDan Carpenter err_drop: 35794ac20c70SIlya Dryomov mnt_drop_write_file(file); 35803fa421deSJosef Bacik if (bdev) 35813fa421deSJosef Bacik blkdev_put(bdev, mode); 35821a15eb72SJosef Bacik out: 35831a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 35841a15eb72SJosef Bacik kfree(vol_args); 3585f46b5a66SChristoph Hellwig return ret; 3586f46b5a66SChristoph Hellwig } 3587f46b5a66SChristoph Hellwig 3588f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3589f46b5a66SChristoph Hellwig { 35901a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 35910b246afaSJeff Mahoney struct inode *inode = file_inode(file); 35920b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3593f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 35943fa421deSJosef Bacik struct block_device *bdev = NULL; 35953fa421deSJosef Bacik fmode_t mode; 3596f46b5a66SChristoph Hellwig int ret; 359737b45995STom Rix bool cancel = false; 3598f46b5a66SChristoph Hellwig 3599f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3600f46b5a66SChristoph Hellwig return -EPERM; 3601f46b5a66SChristoph Hellwig 36021a15eb72SJosef Bacik vol_args = memdup_user(arg, sizeof(*vol_args)); 36031a15eb72SJosef Bacik if (IS_ERR(vol_args)) 36041a15eb72SJosef Bacik return PTR_ERR(vol_args); 36051a15eb72SJosef Bacik 36061a15eb72SJosef Bacik vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 36071a15eb72SJosef Bacik if (!strcmp("cancel", vol_args->name)) { 36081a15eb72SJosef Bacik cancel = true; 36091a15eb72SJosef Bacik } else { 36101a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 36111a15eb72SJosef Bacik if (ret) 36121a15eb72SJosef Bacik goto out; 36131a15eb72SJosef Bacik } 36141a15eb72SJosef Bacik 3615f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3616f46b5a66SChristoph Hellwig if (ret) 36171a15eb72SJosef Bacik goto out; 3618f46b5a66SChristoph Hellwig 361967ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 362067ae34b6SDavid Sterba cancel); 362167ae34b6SDavid Sterba if (ret == 0) { 36221a15eb72SJosef Bacik ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); 3623f46b5a66SChristoph Hellwig if (!ret) 36240b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3625c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 362667ae34b6SDavid Sterba } 362767ae34b6SDavid Sterba 3628f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 36293fa421deSJosef Bacik if (bdev) 36303fa421deSJosef Bacik blkdev_put(bdev, mode); 36311a15eb72SJosef Bacik out: 36321a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 36331a15eb72SJosef Bacik kfree(vol_args); 3634f46b5a66SChristoph Hellwig return ret; 3635f46b5a66SChristoph Hellwig } 3636f46b5a66SChristoph Hellwig 36372ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 36382ff7e61eSJeff Mahoney void __user *arg) 3639475f6387SJan Schmidt { 3640027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3641475f6387SJan Schmidt struct btrfs_device *device; 36420b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3643137c5418SJohannes Thumshirn u64 flags_in; 3644027ed2f0SLi Zefan int ret = 0; 3645475f6387SJan Schmidt 3646137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3647137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3648137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3649137c5418SJohannes Thumshirn 3650137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3651137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3652027ed2f0SLi Zefan 3653d03262c7SDavid Sterba rcu_read_lock(); 3654027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3655475f6387SJan Schmidt 3656d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3657027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3658027ed2f0SLi Zefan fi_args->max_id = device->devid; 3659475f6387SJan Schmidt } 3660d03262c7SDavid Sterba rcu_read_unlock(); 3661475f6387SJan Schmidt 3662de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3663bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3664bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3665bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 366680a773fbSDavid Sterba 3667137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3668137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3669137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3670137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3671137c5418SJohannes Thumshirn } 3672137c5418SJohannes Thumshirn 36730fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 36740fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 36750fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 36760fb408a5SJohannes Thumshirn } 36770fb408a5SJohannes Thumshirn 367849bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 367949bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 368049bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 368149bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 368249bac897SJohannes Thumshirn } 368349bac897SJohannes Thumshirn 3684027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3685027ed2f0SLi Zefan ret = -EFAULT; 3686475f6387SJan Schmidt 3687027ed2f0SLi Zefan kfree(fi_args); 3688027ed2f0SLi Zefan return ret; 3689475f6387SJan Schmidt } 3690475f6387SJan Schmidt 36912ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 36922ff7e61eSJeff Mahoney void __user *arg) 3693475f6387SJan Schmidt { 3694562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 3695475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3696475f6387SJan Schmidt struct btrfs_device *dev; 3697475f6387SJan Schmidt int ret = 0; 3698475f6387SJan Schmidt 3699475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3700475f6387SJan Schmidt if (IS_ERR(di_args)) 3701475f6387SJan Schmidt return PTR_ERR(di_args); 3702475f6387SJan Schmidt 3703562d7b15SJosef Bacik args.devid = di_args->devid; 3704dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3705562d7b15SJosef Bacik args.uuid = di_args->uuid; 3706475f6387SJan Schmidt 3707c5593ca3SDavid Sterba rcu_read_lock(); 3708562d7b15SJosef Bacik dev = btrfs_find_device(fs_info->fs_devices, &args); 3709475f6387SJan Schmidt if (!dev) { 3710475f6387SJan Schmidt ret = -ENODEV; 3711475f6387SJan Schmidt goto out; 3712475f6387SJan Schmidt } 3713475f6387SJan Schmidt 3714475f6387SJan Schmidt di_args->devid = dev->devid; 37157cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 37167cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3717475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3718a27202fbSJim Meyering if (dev->name) { 3719672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3720672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3721a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3722a27202fbSJim Meyering } else { 372399ba55adSStefan Behrens di_args->path[0] = '\0'; 3724a27202fbSJim Meyering } 3725475f6387SJan Schmidt 3726475f6387SJan Schmidt out: 3727c5593ca3SDavid Sterba rcu_read_unlock(); 3728475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3729475f6387SJan Schmidt ret = -EFAULT; 3730475f6387SJan Schmidt 3731475f6387SJan Schmidt kfree(di_args); 3732475f6387SJan Schmidt return ret; 3733475f6387SJan Schmidt } 3734475f6387SJan Schmidt 37356ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 37366ef5ed0dSJosef Bacik { 3737496ad9aaSAl Viro struct inode *inode = file_inode(file); 37380b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 37396ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 37406ef5ed0dSJosef Bacik struct btrfs_root *new_root; 37416ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 37426ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 37432a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 37446ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 37456ef5ed0dSJosef Bacik u64 objectid = 0; 37466ef5ed0dSJosef Bacik u64 dir_id; 37473c04ce01SMiao Xie int ret; 37486ef5ed0dSJosef Bacik 37496ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 37506ef5ed0dSJosef Bacik return -EPERM; 37516ef5ed0dSJosef Bacik 37523c04ce01SMiao Xie ret = mnt_want_write_file(file); 37533c04ce01SMiao Xie if (ret) 37543c04ce01SMiao Xie return ret; 37553c04ce01SMiao Xie 37563c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 37573c04ce01SMiao Xie ret = -EFAULT; 37583c04ce01SMiao Xie goto out; 37593c04ce01SMiao Xie } 37606ef5ed0dSJosef Bacik 37616ef5ed0dSJosef Bacik if (!objectid) 37621cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 37636ef5ed0dSJosef Bacik 376456e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 37653c04ce01SMiao Xie if (IS_ERR(new_root)) { 37663c04ce01SMiao Xie ret = PTR_ERR(new_root); 37673c04ce01SMiao Xie goto out; 37683c04ce01SMiao Xie } 37692a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 37702a2b5d62SJosef Bacik ret = -ENOENT; 37712a2b5d62SJosef Bacik goto out_free; 37722a2b5d62SJosef Bacik } 37736ef5ed0dSJosef Bacik 37746ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 37753c04ce01SMiao Xie if (!path) { 37763c04ce01SMiao Xie ret = -ENOMEM; 37772a2b5d62SJosef Bacik goto out_free; 37783c04ce01SMiao Xie } 37796ef5ed0dSJosef Bacik 37806ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 378198d5dc13STsutomu Itoh if (IS_ERR(trans)) { 37823c04ce01SMiao Xie ret = PTR_ERR(trans); 37832a2b5d62SJosef Bacik goto out_free; 37846ef5ed0dSJosef Bacik } 37856ef5ed0dSJosef Bacik 37860b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 37870b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 37886ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3789cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 37902a2b5d62SJosef Bacik btrfs_release_path(path); 37913a45bb20SJeff Mahoney btrfs_end_transaction(trans); 37920b246afaSJeff Mahoney btrfs_err(fs_info, 37935d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 37943c04ce01SMiao Xie ret = -ENOENT; 37952a2b5d62SJosef Bacik goto out_free; 37966ef5ed0dSJosef Bacik } 37976ef5ed0dSJosef Bacik 37986ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 37996ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 38006ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 38012a2b5d62SJosef Bacik btrfs_release_path(path); 38026ef5ed0dSJosef Bacik 38030b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 38043a45bb20SJeff Mahoney btrfs_end_transaction(trans); 38052a2b5d62SJosef Bacik out_free: 380600246528SJosef Bacik btrfs_put_root(new_root); 38072a2b5d62SJosef Bacik btrfs_free_path(path); 38083c04ce01SMiao Xie out: 38093c04ce01SMiao Xie mnt_drop_write_file(file); 38103c04ce01SMiao Xie return ret; 38116ef5ed0dSJosef Bacik } 38126ef5ed0dSJosef Bacik 3813c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3814bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3815bf5fc093SJosef Bacik { 381632da5386SDavid Sterba struct btrfs_block_group *block_group; 3817bf5fc093SJosef Bacik 3818bf5fc093SJosef Bacik space->total_bytes = 0; 3819bf5fc093SJosef Bacik space->used_bytes = 0; 3820bf5fc093SJosef Bacik space->flags = 0; 3821bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3822bf5fc093SJosef Bacik space->flags = block_group->flags; 3823b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3824bf38be65SDavid Sterba space->used_bytes += block_group->used; 3825bf5fc093SJosef Bacik } 3826bf5fc093SJosef Bacik } 3827bf5fc093SJosef Bacik 38282ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 38292ff7e61eSJeff Mahoney void __user *arg) 38301406e432SJosef Bacik { 38311406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 38321406e432SJosef Bacik struct btrfs_ioctl_space_info space; 38331406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 38347fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 383513f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 38361406e432SJosef Bacik struct btrfs_space_info *info; 3837315d8e98SColin Ian King static const u64 types[] = { 3838315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3839bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3840bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3841315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3842315d8e98SColin Ian King }; 3843bf5fc093SJosef Bacik int num_types = 4; 38447fde62bfSChris Mason int alloc_size; 38451406e432SJosef Bacik int ret = 0; 384651788b1bSDan Rosenberg u64 slot_count = 0; 3847bf5fc093SJosef Bacik int i, c; 38481406e432SJosef Bacik 38491406e432SJosef Bacik if (copy_from_user(&space_args, 38501406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 38511406e432SJosef Bacik sizeof(space_args))) 38521406e432SJosef Bacik return -EFAULT; 38531406e432SJosef Bacik 3854bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3855bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3856bf5fc093SJosef Bacik 3857bf5fc093SJosef Bacik info = NULL; 385872804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3859bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3860bf5fc093SJosef Bacik info = tmp; 3861bf5fc093SJosef Bacik break; 3862bf5fc093SJosef Bacik } 3863bf5fc093SJosef Bacik } 38641406e432SJosef Bacik 3865bf5fc093SJosef Bacik if (!info) 3866bf5fc093SJosef Bacik continue; 3867bf5fc093SJosef Bacik 3868bf5fc093SJosef Bacik down_read(&info->groups_sem); 3869bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3870bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3871bf5fc093SJosef Bacik slot_count++; 3872bf5fc093SJosef Bacik } 3873bf5fc093SJosef Bacik up_read(&info->groups_sem); 3874bf5fc093SJosef Bacik } 3875bf5fc093SJosef Bacik 387636523e95SDavid Sterba /* 387736523e95SDavid Sterba * Global block reserve, exported as a space_info 387836523e95SDavid Sterba */ 387936523e95SDavid Sterba slot_count++; 388036523e95SDavid Sterba 38817fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 38827fde62bfSChris Mason if (space_args.space_slots == 0) { 38837fde62bfSChris Mason space_args.total_spaces = slot_count; 38847fde62bfSChris Mason goto out; 38857fde62bfSChris Mason } 3886bf5fc093SJosef Bacik 388751788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3888bf5fc093SJosef Bacik 38897fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3890bf5fc093SJosef Bacik 38917fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 38927fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 38937fde62bfSChris Mason */ 389409cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 38957fde62bfSChris Mason return -ENOMEM; 38967fde62bfSChris Mason 38977fde62bfSChris Mason space_args.total_spaces = 0; 38988d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 38997fde62bfSChris Mason if (!dest) 39007fde62bfSChris Mason return -ENOMEM; 39017fde62bfSChris Mason dest_orig = dest; 39027fde62bfSChris Mason 39037fde62bfSChris Mason /* now we have a buffer to copy into */ 3904bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3905bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3906bf5fc093SJosef Bacik 390751788b1bSDan Rosenberg if (!slot_count) 390851788b1bSDan Rosenberg break; 390951788b1bSDan Rosenberg 3910bf5fc093SJosef Bacik info = NULL; 391172804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3912bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3913bf5fc093SJosef Bacik info = tmp; 39147fde62bfSChris Mason break; 3915bf5fc093SJosef Bacik } 3916bf5fc093SJosef Bacik } 39177fde62bfSChris Mason 3918bf5fc093SJosef Bacik if (!info) 3919bf5fc093SJosef Bacik continue; 3920bf5fc093SJosef Bacik down_read(&info->groups_sem); 3921bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3922bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3923c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3924c065f5b1SSu Yue &space); 39257fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 39261406e432SJosef Bacik dest++; 39271406e432SJosef Bacik space_args.total_spaces++; 392851788b1bSDan Rosenberg slot_count--; 39291406e432SJosef Bacik } 393051788b1bSDan Rosenberg if (!slot_count) 393151788b1bSDan Rosenberg break; 3932bf5fc093SJosef Bacik } 3933bf5fc093SJosef Bacik up_read(&info->groups_sem); 3934bf5fc093SJosef Bacik } 39351406e432SJosef Bacik 393636523e95SDavid Sterba /* 393736523e95SDavid Sterba * Add global block reserve 393836523e95SDavid Sterba */ 393936523e95SDavid Sterba if (slot_count) { 39400b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 394136523e95SDavid Sterba 394236523e95SDavid Sterba spin_lock(&block_rsv->lock); 394336523e95SDavid Sterba space.total_bytes = block_rsv->size; 394436523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 394536523e95SDavid Sterba spin_unlock(&block_rsv->lock); 394636523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 394736523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 394836523e95SDavid Sterba space_args.total_spaces++; 394936523e95SDavid Sterba } 395036523e95SDavid Sterba 39512eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 39527fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 39537fde62bfSChris Mason 39547fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 39557fde62bfSChris Mason ret = -EFAULT; 39567fde62bfSChris Mason 39577fde62bfSChris Mason kfree(dest_orig); 39587fde62bfSChris Mason out: 39597fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 39601406e432SJosef Bacik ret = -EFAULT; 39611406e432SJosef Bacik 39621406e432SJosef Bacik return ret; 39631406e432SJosef Bacik } 39641406e432SJosef Bacik 39659a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 39669a8c28beSMiao Xie void __user *argp) 396746204592SSage Weil { 396846204592SSage Weil struct btrfs_trans_handle *trans; 396946204592SSage Weil u64 transid; 397046204592SSage Weil 3971d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3972ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3973ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 397498d5dc13STsutomu Itoh return PTR_ERR(trans); 3975ff7c1d33SMiao Xie 3976ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3977ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3978ff7c1d33SMiao Xie goto out; 3979ff7c1d33SMiao Xie } 398046204592SSage Weil transid = trans->transid; 3981fdfbf020SJosef Bacik btrfs_commit_transaction_async(trans); 3982ff7c1d33SMiao Xie out: 398346204592SSage Weil if (argp) 398446204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 398546204592SSage Weil return -EFAULT; 398646204592SSage Weil return 0; 398746204592SSage Weil } 398846204592SSage Weil 39892ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 39909a8c28beSMiao Xie void __user *argp) 399146204592SSage Weil { 399246204592SSage Weil u64 transid; 399346204592SSage Weil 399446204592SSage Weil if (argp) { 399546204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 399646204592SSage Weil return -EFAULT; 399746204592SSage Weil } else { 399846204592SSage Weil transid = 0; /* current trans */ 399946204592SSage Weil } 40002ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 400146204592SSage Weil } 400246204592SSage Weil 4003b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 4004475f6387SJan Schmidt { 40050b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 4006475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4007b8e95489SMiao Xie int ret; 4008475f6387SJan Schmidt 4009475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4010475f6387SJan Schmidt return -EPERM; 4011475f6387SJan Schmidt 4012da32c6d5SJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 4013da32c6d5SJosef Bacik btrfs_err(fs_info, "scrub is not supported on extent tree v2 yet"); 4014da32c6d5SJosef Bacik return -EINVAL; 4015da32c6d5SJosef Bacik } 4016da32c6d5SJosef Bacik 4017475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4018475f6387SJan Schmidt if (IS_ERR(sa)) 4019475f6387SJan Schmidt return PTR_ERR(sa); 4020475f6387SJan Schmidt 4021b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 4022b8e95489SMiao Xie ret = mnt_want_write_file(file); 4023b8e95489SMiao Xie if (ret) 4024b8e95489SMiao Xie goto out; 4025b8e95489SMiao Xie } 4026b8e95489SMiao Xie 40270b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 402863a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 402963a212abSStefan Behrens 0); 4030475f6387SJan Schmidt 40315afe6ce7SFilipe Manana /* 40325afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 40335afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 40345afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 40355afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 40365afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 40375afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 40385afe6ce7SFilipe Manana * previously (btrfs-progs does this). 40395afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 40405afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 40415afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 40425afe6ce7SFilipe Manana */ 40435afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 4044475f6387SJan Schmidt ret = -EFAULT; 4045475f6387SJan Schmidt 4046b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 4047b8e95489SMiao Xie mnt_drop_write_file(file); 4048b8e95489SMiao Xie out: 4049475f6387SJan Schmidt kfree(sa); 4050475f6387SJan Schmidt return ret; 4051475f6387SJan Schmidt } 4052475f6387SJan Schmidt 40532ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 4054475f6387SJan Schmidt { 4055475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4056475f6387SJan Schmidt return -EPERM; 4057475f6387SJan Schmidt 40582ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 4059475f6387SJan Schmidt } 4060475f6387SJan Schmidt 40612ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 4062475f6387SJan Schmidt void __user *arg) 4063475f6387SJan Schmidt { 4064475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4065475f6387SJan Schmidt int ret; 4066475f6387SJan Schmidt 4067475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4068475f6387SJan Schmidt return -EPERM; 4069475f6387SJan Schmidt 4070475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4071475f6387SJan Schmidt if (IS_ERR(sa)) 4072475f6387SJan Schmidt return PTR_ERR(sa); 4073475f6387SJan Schmidt 40742ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 4075475f6387SJan Schmidt 40764fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 4077475f6387SJan Schmidt ret = -EFAULT; 4078475f6387SJan Schmidt 4079475f6387SJan Schmidt kfree(sa); 4080475f6387SJan Schmidt return ret; 4081475f6387SJan Schmidt } 4082475f6387SJan Schmidt 40832ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 4084b27f7c0cSDavid Sterba void __user *arg) 4085c11d2c23SStefan Behrens { 4086c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 4087c11d2c23SStefan Behrens int ret; 4088c11d2c23SStefan Behrens 4089c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 4090c11d2c23SStefan Behrens if (IS_ERR(sa)) 4091c11d2c23SStefan Behrens return PTR_ERR(sa); 4092c11d2c23SStefan Behrens 4093b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 4094b27f7c0cSDavid Sterba kfree(sa); 4095b27f7c0cSDavid Sterba return -EPERM; 4096b27f7c0cSDavid Sterba } 4097b27f7c0cSDavid Sterba 40982ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 4099c11d2c23SStefan Behrens 4100eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 4101c11d2c23SStefan Behrens ret = -EFAULT; 4102c11d2c23SStefan Behrens 4103c11d2c23SStefan Behrens kfree(sa); 4104c11d2c23SStefan Behrens return ret; 4105c11d2c23SStefan Behrens } 4106c11d2c23SStefan Behrens 41072ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 41082ff7e61eSJeff Mahoney void __user *arg) 41093f6bcfbdSStefan Behrens { 41103f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 41113f6bcfbdSStefan Behrens int ret; 41123f6bcfbdSStefan Behrens 41133f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 41143f6bcfbdSStefan Behrens return -EPERM; 41153f6bcfbdSStefan Behrens 4116914a519bSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 4117914a519bSJosef Bacik btrfs_err(fs_info, "device replace not supported on extent tree v2 yet"); 4118914a519bSJosef Bacik return -EINVAL; 4119914a519bSJosef Bacik } 4120914a519bSJosef Bacik 41213f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 41223f6bcfbdSStefan Behrens if (IS_ERR(p)) 41233f6bcfbdSStefan Behrens return PTR_ERR(p); 41243f6bcfbdSStefan Behrens 41253f6bcfbdSStefan Behrens switch (p->cmd) { 41263f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 4127bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 4128adfa97cbSIlya Dryomov ret = -EROFS; 4129adfa97cbSIlya Dryomov goto out; 4130adfa97cbSIlya Dryomov } 4131c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 4132e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 41333f6bcfbdSStefan Behrens } else { 41342ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 4135c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 41363f6bcfbdSStefan Behrens } 41373f6bcfbdSStefan Behrens break; 41383f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 41390b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 41403f6bcfbdSStefan Behrens ret = 0; 41413f6bcfbdSStefan Behrens break; 41423f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 414317d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 414497282031SAnand Jain ret = 0; 41453f6bcfbdSStefan Behrens break; 41463f6bcfbdSStefan Behrens default: 41473f6bcfbdSStefan Behrens ret = -EINVAL; 41483f6bcfbdSStefan Behrens break; 41493f6bcfbdSStefan Behrens } 41503f6bcfbdSStefan Behrens 4151d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 41523f6bcfbdSStefan Behrens ret = -EFAULT; 4153adfa97cbSIlya Dryomov out: 41543f6bcfbdSStefan Behrens kfree(p); 41553f6bcfbdSStefan Behrens return ret; 41563f6bcfbdSStefan Behrens } 41573f6bcfbdSStefan Behrens 4158d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 4159d7728c96SJan Schmidt { 4160d7728c96SJan Schmidt int ret = 0; 4161d7728c96SJan Schmidt int i; 4162740c3d22SChris Mason u64 rel_ptr; 4163d7728c96SJan Schmidt int size; 4164806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 4165d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 4166d7728c96SJan Schmidt struct btrfs_path *path; 4167d7728c96SJan Schmidt 416882b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 4169d7728c96SJan Schmidt return -EPERM; 4170d7728c96SJan Schmidt 4171d7728c96SJan Schmidt path = btrfs_alloc_path(); 4172d7728c96SJan Schmidt if (!path) { 4173d7728c96SJan Schmidt ret = -ENOMEM; 4174d7728c96SJan Schmidt goto out; 4175d7728c96SJan Schmidt } 4176d7728c96SJan Schmidt 4177d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 4178d7728c96SJan Schmidt if (IS_ERR(ipa)) { 4179d7728c96SJan Schmidt ret = PTR_ERR(ipa); 4180d7728c96SJan Schmidt ipa = NULL; 4181d7728c96SJan Schmidt goto out; 4182d7728c96SJan Schmidt } 4183d7728c96SJan Schmidt 4184d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 4185d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 4186d7728c96SJan Schmidt if (IS_ERR(ipath)) { 4187d7728c96SJan Schmidt ret = PTR_ERR(ipath); 4188d7728c96SJan Schmidt ipath = NULL; 4189d7728c96SJan Schmidt goto out; 4190d7728c96SJan Schmidt } 4191d7728c96SJan Schmidt 4192d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 4193d7728c96SJan Schmidt if (ret < 0) 4194d7728c96SJan Schmidt goto out; 4195d7728c96SJan Schmidt 4196d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 4197745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 4198745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 4199740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 4200d7728c96SJan Schmidt } 4201d7728c96SJan Schmidt 4202718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 4203718dc5faSOmar Sandoval ipath->fspath, size); 4204d7728c96SJan Schmidt if (ret) { 4205d7728c96SJan Schmidt ret = -EFAULT; 4206d7728c96SJan Schmidt goto out; 4207d7728c96SJan Schmidt } 4208d7728c96SJan Schmidt 4209d7728c96SJan Schmidt out: 4210d7728c96SJan Schmidt btrfs_free_path(path); 4211d7728c96SJan Schmidt free_ipath(ipath); 4212d7728c96SJan Schmidt kfree(ipa); 4213d7728c96SJan Schmidt 4214d7728c96SJan Schmidt return ret; 4215d7728c96SJan Schmidt } 4216d7728c96SJan Schmidt 4217d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 4218d7728c96SJan Schmidt { 4219d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 4220d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 4221d7728c96SJan Schmidt 4222d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 4223d7728c96SJan Schmidt inodes->bytes_left -= c; 4224d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 4225d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 4226d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 4227d7728c96SJan Schmidt inodes->elem_cnt += 3; 4228d7728c96SJan Schmidt } else { 4229d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 4230d7728c96SJan Schmidt inodes->bytes_left = 0; 4231d7728c96SJan Schmidt inodes->elem_missed += 3; 4232d7728c96SJan Schmidt } 4233d7728c96SJan Schmidt 4234d7728c96SJan Schmidt return 0; 4235d7728c96SJan Schmidt } 4236d7728c96SJan Schmidt 42372ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 4238d24a67b2SZygo Blaxell void __user *arg, int version) 4239d7728c96SJan Schmidt { 4240d7728c96SJan Schmidt int ret = 0; 4241d7728c96SJan Schmidt int size; 4242d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 4243d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 4244d7728c96SJan Schmidt struct btrfs_path *path = NULL; 4245d24a67b2SZygo Blaxell bool ignore_offset; 4246d7728c96SJan Schmidt 4247d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4248d7728c96SJan Schmidt return -EPERM; 4249d7728c96SJan Schmidt 4250d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 42517b9ea627SShailendra Verma if (IS_ERR(loi)) 42527b9ea627SShailendra Verma return PTR_ERR(loi); 4253d7728c96SJan Schmidt 4254d24a67b2SZygo Blaxell if (version == 1) { 4255d24a67b2SZygo Blaxell ignore_offset = false; 4256b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 4257d24a67b2SZygo Blaxell } else { 4258d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 4259d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 4260d24a67b2SZygo Blaxell ret = -EINVAL; 4261d24a67b2SZygo Blaxell goto out_loi; 4262d24a67b2SZygo Blaxell } 4263d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 4264d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 4265d24a67b2SZygo Blaxell ret = -EINVAL; 4266d24a67b2SZygo Blaxell goto out_loi; 4267d24a67b2SZygo Blaxell } 4268d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 4269b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 4270d24a67b2SZygo Blaxell } 4271d24a67b2SZygo Blaxell 4272d7728c96SJan Schmidt path = btrfs_alloc_path(); 4273d7728c96SJan Schmidt if (!path) { 4274d7728c96SJan Schmidt ret = -ENOMEM; 4275d7728c96SJan Schmidt goto out; 4276d7728c96SJan Schmidt } 4277d7728c96SJan Schmidt 4278d7728c96SJan Schmidt inodes = init_data_container(size); 4279d7728c96SJan Schmidt if (IS_ERR(inodes)) { 4280d7728c96SJan Schmidt ret = PTR_ERR(inodes); 4281d7728c96SJan Schmidt inodes = NULL; 4282d7728c96SJan Schmidt goto out; 4283d7728c96SJan Schmidt } 4284d7728c96SJan Schmidt 42852ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 4286d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 4287df031f07SLiu Bo if (ret == -EINVAL) 4288d7728c96SJan Schmidt ret = -ENOENT; 4289d7728c96SJan Schmidt if (ret < 0) 4290d7728c96SJan Schmidt goto out; 4291d7728c96SJan Schmidt 4292718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 4293718dc5faSOmar Sandoval size); 4294d7728c96SJan Schmidt if (ret) 4295d7728c96SJan Schmidt ret = -EFAULT; 4296d7728c96SJan Schmidt 4297d7728c96SJan Schmidt out: 4298d7728c96SJan Schmidt btrfs_free_path(path); 4299f54de068SDavid Sterba kvfree(inodes); 4300d24a67b2SZygo Blaxell out_loi: 4301d7728c96SJan Schmidt kfree(loi); 4302d7728c96SJan Schmidt 4303d7728c96SJan Schmidt return ret; 4304d7728c96SJan Schmidt } 4305d7728c96SJan Schmidt 4306008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 4307c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 4308c9e9f97bSIlya Dryomov { 4309c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 4310c9e9f97bSIlya Dryomov 4311c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 4312c9e9f97bSIlya Dryomov 43133009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 4314837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 4315837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 4316837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 4317a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 4318a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 4319837d5b6eSIlya Dryomov 4320c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 4321c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 4322c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 432319a39dceSIlya Dryomov 432419a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 432519a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 432619a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 4327c9e9f97bSIlya Dryomov } 4328c9e9f97bSIlya Dryomov 43299ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4330c9e9f97bSIlya Dryomov { 4331496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4332c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4333c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4334c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4335ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4336c9e9f97bSIlya Dryomov int ret; 4337c9e9f97bSIlya Dryomov 43386c405b24SNikolay Borisov if (!arg) 43396c405b24SNikolay Borisov btrfs_warn(fs_info, 43406c405b24SNikolay Borisov "IOC_BALANCE ioctl (v1) is deprecated and will be removed in kernel 5.18"); 43416c405b24SNikolay Borisov 4342c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4343c9e9f97bSIlya Dryomov return -EPERM; 4344c9e9f97bSIlya Dryomov 4345e54bfa31SLiu Bo ret = mnt_want_write_file(file); 43469ba1f6e4SLiu Bo if (ret) 43479ba1f6e4SLiu Bo return ret; 43489ba1f6e4SLiu Bo 4349ed0fb78fSIlya Dryomov again: 4350c3e1f96cSGoldwyn Rodrigues if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 4351c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4352ed0fb78fSIlya Dryomov need_unlock = true; 4353ed0fb78fSIlya Dryomov goto locked; 4354ed0fb78fSIlya Dryomov } 4355ed0fb78fSIlya Dryomov 4356ed0fb78fSIlya Dryomov /* 435701327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 4358ed0fb78fSIlya Dryomov * (1) some other op is running 4359ed0fb78fSIlya Dryomov * (2) balance is running 4360ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4361ed0fb78fSIlya Dryomov */ 4362ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4363ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4364ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 43653009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4366ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4367dccdb07bSDavid Sterba /* 4368dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 4369dccdb07bSDavid Sterba * we'll reexamine the status again. 4370dccdb07bSDavid Sterba */ 4371ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4372ed0fb78fSIlya Dryomov 4373ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 43743009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4375ed0fb78fSIlya Dryomov /* this is (3) */ 4376ed0fb78fSIlya Dryomov need_unlock = false; 4377ed0fb78fSIlya Dryomov goto locked; 4378ed0fb78fSIlya Dryomov } 4379ed0fb78fSIlya Dryomov 4380ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4381ed0fb78fSIlya Dryomov goto again; 4382ed0fb78fSIlya Dryomov } else { 4383ed0fb78fSIlya Dryomov /* this is (2) */ 4384ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4385ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4386ed0fb78fSIlya Dryomov goto out; 4387ed0fb78fSIlya Dryomov } 4388ed0fb78fSIlya Dryomov } else { 4389ed0fb78fSIlya Dryomov /* this is (1) */ 4390ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4391e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4392ed0fb78fSIlya Dryomov goto out; 4393ed0fb78fSIlya Dryomov } 4394ed0fb78fSIlya Dryomov 4395ed0fb78fSIlya Dryomov locked: 4396c9e9f97bSIlya Dryomov 4397c9e9f97bSIlya Dryomov if (arg) { 4398c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4399c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4400c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4401ed0fb78fSIlya Dryomov goto out_unlock; 4402c9e9f97bSIlya Dryomov } 4403de322263SIlya Dryomov 4404de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4405de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4406de322263SIlya Dryomov ret = -ENOTCONN; 4407de322263SIlya Dryomov goto out_bargs; 4408de322263SIlya Dryomov } 4409de322263SIlya Dryomov 4410de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4411de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4412de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4413de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4414efc0e69cSNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE); 4415de322263SIlya Dryomov 4416de322263SIlya Dryomov goto do_balance; 4417de322263SIlya Dryomov } 4418c9e9f97bSIlya Dryomov } else { 4419c9e9f97bSIlya Dryomov bargs = NULL; 4420c9e9f97bSIlya Dryomov } 4421c9e9f97bSIlya Dryomov 4422ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4423837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4424837d5b6eSIlya Dryomov goto out_bargs; 4425837d5b6eSIlya Dryomov } 4426837d5b6eSIlya Dryomov 44278d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4428c9e9f97bSIlya Dryomov if (!bctl) { 4429c9e9f97bSIlya Dryomov ret = -ENOMEM; 4430c9e9f97bSIlya Dryomov goto out_bargs; 4431c9e9f97bSIlya Dryomov } 4432c9e9f97bSIlya Dryomov 4433c9e9f97bSIlya Dryomov if (arg) { 4434c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4435c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4436c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4437c9e9f97bSIlya Dryomov 4438c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4439f43ffb60SIlya Dryomov } else { 4440f43ffb60SIlya Dryomov /* balance everything - no filters */ 4441f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4442c9e9f97bSIlya Dryomov } 4443c9e9f97bSIlya Dryomov 44448eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 44458eb93459SDavid Sterba ret = -EINVAL; 44460f89abf5SChristian Engelmayer goto out_bctl; 44478eb93459SDavid Sterba } 44488eb93459SDavid Sterba 4449de322263SIlya Dryomov do_balance: 4450c9e9f97bSIlya Dryomov /* 4451c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 4452c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 4453c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 4454c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 4455c9e9f97bSIlya Dryomov */ 4456ed0fb78fSIlya Dryomov need_unlock = false; 4457ed0fb78fSIlya Dryomov 44586fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 44590f89abf5SChristian Engelmayer bctl = NULL; 4460ed0fb78fSIlya Dryomov 4461d00c2d9cSFilipe Manana if ((ret == 0 || ret == -ECANCELED) && arg) { 4462c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4463c9e9f97bSIlya Dryomov ret = -EFAULT; 4464c9e9f97bSIlya Dryomov } 4465c9e9f97bSIlya Dryomov 44660f89abf5SChristian Engelmayer out_bctl: 44670f89abf5SChristian Engelmayer kfree(bctl); 4468c9e9f97bSIlya Dryomov out_bargs: 4469c9e9f97bSIlya Dryomov kfree(bargs); 4470ed0fb78fSIlya Dryomov out_unlock: 4471c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4472ed0fb78fSIlya Dryomov if (need_unlock) 4473c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 4474ed0fb78fSIlya Dryomov out: 4475e54bfa31SLiu Bo mnt_drop_write_file(file); 4476c9e9f97bSIlya Dryomov return ret; 4477c9e9f97bSIlya Dryomov } 4478c9e9f97bSIlya Dryomov 44792ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4480837d5b6eSIlya Dryomov { 4481837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4482837d5b6eSIlya Dryomov return -EPERM; 4483837d5b6eSIlya Dryomov 4484837d5b6eSIlya Dryomov switch (cmd) { 4485837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 44860b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4487a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 44880b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4489837d5b6eSIlya Dryomov } 4490837d5b6eSIlya Dryomov 4491837d5b6eSIlya Dryomov return -EINVAL; 4492837d5b6eSIlya Dryomov } 4493837d5b6eSIlya Dryomov 44942ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 449519a39dceSIlya Dryomov void __user *arg) 449619a39dceSIlya Dryomov { 449719a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 449819a39dceSIlya Dryomov int ret = 0; 449919a39dceSIlya Dryomov 450019a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 450119a39dceSIlya Dryomov return -EPERM; 450219a39dceSIlya Dryomov 450319a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 450419a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 450519a39dceSIlya Dryomov ret = -ENOTCONN; 450619a39dceSIlya Dryomov goto out; 450719a39dceSIlya Dryomov } 450819a39dceSIlya Dryomov 45098d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 451019a39dceSIlya Dryomov if (!bargs) { 451119a39dceSIlya Dryomov ret = -ENOMEM; 451219a39dceSIlya Dryomov goto out; 451319a39dceSIlya Dryomov } 451419a39dceSIlya Dryomov 4515008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 451619a39dceSIlya Dryomov 451719a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 451819a39dceSIlya Dryomov ret = -EFAULT; 451919a39dceSIlya Dryomov 452019a39dceSIlya Dryomov kfree(bargs); 452119a39dceSIlya Dryomov out: 452219a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 452319a39dceSIlya Dryomov return ret; 452419a39dceSIlya Dryomov } 452519a39dceSIlya Dryomov 4526905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 45275d13a37bSArne Jansen { 45280b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45290b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45305d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 45315d13a37bSArne Jansen int ret; 45325d13a37bSArne Jansen 45335d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 45345d13a37bSArne Jansen return -EPERM; 45355d13a37bSArne Jansen 4536905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4537905b0ddaSMiao Xie if (ret) 4538905b0ddaSMiao Xie return ret; 45395d13a37bSArne Jansen 45405d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4541905b0ddaSMiao Xie if (IS_ERR(sa)) { 4542905b0ddaSMiao Xie ret = PTR_ERR(sa); 4543905b0ddaSMiao Xie goto drop_write; 4544905b0ddaSMiao Xie } 45455d13a37bSArne Jansen 45460b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 45475d13a37bSArne Jansen 45485d13a37bSArne Jansen switch (sa->cmd) { 45495d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4550340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 45515d13a37bSArne Jansen break; 45525d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4553340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 45545d13a37bSArne Jansen break; 45555d13a37bSArne Jansen default: 45565d13a37bSArne Jansen ret = -EINVAL; 45575d13a37bSArne Jansen break; 45585d13a37bSArne Jansen } 45595d13a37bSArne Jansen 45605d13a37bSArne Jansen kfree(sa); 45610b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4562905b0ddaSMiao Xie drop_write: 4563905b0ddaSMiao Xie mnt_drop_write_file(file); 45645d13a37bSArne Jansen return ret; 45655d13a37bSArne Jansen } 45665d13a37bSArne Jansen 4567905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 45685d13a37bSArne Jansen { 45690b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45700b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45710b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 45725d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 45735d13a37bSArne Jansen struct btrfs_trans_handle *trans; 45745d13a37bSArne Jansen int ret; 45755d13a37bSArne Jansen int err; 45765d13a37bSArne Jansen 45775d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 45785d13a37bSArne Jansen return -EPERM; 45795d13a37bSArne Jansen 4580905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4581905b0ddaSMiao Xie if (ret) 4582905b0ddaSMiao Xie return ret; 45835d13a37bSArne Jansen 45845d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4585905b0ddaSMiao Xie if (IS_ERR(sa)) { 4586905b0ddaSMiao Xie ret = PTR_ERR(sa); 4587905b0ddaSMiao Xie goto drop_write; 4588905b0ddaSMiao Xie } 45895d13a37bSArne Jansen 45905d13a37bSArne Jansen trans = btrfs_join_transaction(root); 45915d13a37bSArne Jansen if (IS_ERR(trans)) { 45925d13a37bSArne Jansen ret = PTR_ERR(trans); 45935d13a37bSArne Jansen goto out; 45945d13a37bSArne Jansen } 45955d13a37bSArne Jansen 45965d13a37bSArne Jansen if (sa->assign) { 45979f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 45985d13a37bSArne Jansen } else { 459939616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 46005d13a37bSArne Jansen } 46015d13a37bSArne Jansen 4602e082f563SQu Wenruo /* update qgroup status and info */ 4603280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4604e082f563SQu Wenruo if (err < 0) 46050b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4606ad8403dfSAnand Jain "failed to update qgroup status and info"); 46073a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 46085d13a37bSArne Jansen if (err && !ret) 46095d13a37bSArne Jansen ret = err; 46105d13a37bSArne Jansen 46115d13a37bSArne Jansen out: 46125d13a37bSArne Jansen kfree(sa); 4613905b0ddaSMiao Xie drop_write: 4614905b0ddaSMiao Xie mnt_drop_write_file(file); 46155d13a37bSArne Jansen return ret; 46165d13a37bSArne Jansen } 46175d13a37bSArne Jansen 4618905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 46195d13a37bSArne Jansen { 46200b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46210b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46225d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 46235d13a37bSArne Jansen struct btrfs_trans_handle *trans; 46245d13a37bSArne Jansen int ret; 46255d13a37bSArne Jansen int err; 46265d13a37bSArne Jansen 46275d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 46285d13a37bSArne Jansen return -EPERM; 46295d13a37bSArne Jansen 4630905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4631905b0ddaSMiao Xie if (ret) 4632905b0ddaSMiao Xie return ret; 46335d13a37bSArne Jansen 46345d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4635905b0ddaSMiao Xie if (IS_ERR(sa)) { 4636905b0ddaSMiao Xie ret = PTR_ERR(sa); 4637905b0ddaSMiao Xie goto drop_write; 4638905b0ddaSMiao Xie } 46395d13a37bSArne Jansen 4640d86e56cfSMiao Xie if (!sa->qgroupid) { 4641d86e56cfSMiao Xie ret = -EINVAL; 4642d86e56cfSMiao Xie goto out; 4643d86e56cfSMiao Xie } 4644d86e56cfSMiao Xie 46455d13a37bSArne Jansen trans = btrfs_join_transaction(root); 46465d13a37bSArne Jansen if (IS_ERR(trans)) { 46475d13a37bSArne Jansen ret = PTR_ERR(trans); 46485d13a37bSArne Jansen goto out; 46495d13a37bSArne Jansen } 46505d13a37bSArne Jansen 46515d13a37bSArne Jansen if (sa->create) { 465249a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 46535d13a37bSArne Jansen } else { 46543efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 46555d13a37bSArne Jansen } 46565d13a37bSArne Jansen 46573a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 46585d13a37bSArne Jansen if (err && !ret) 46595d13a37bSArne Jansen ret = err; 46605d13a37bSArne Jansen 46615d13a37bSArne Jansen out: 46625d13a37bSArne Jansen kfree(sa); 4663905b0ddaSMiao Xie drop_write: 4664905b0ddaSMiao Xie mnt_drop_write_file(file); 46655d13a37bSArne Jansen return ret; 46665d13a37bSArne Jansen } 46675d13a37bSArne Jansen 4668905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 46695d13a37bSArne Jansen { 46700b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46710b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46725d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 46735d13a37bSArne Jansen struct btrfs_trans_handle *trans; 46745d13a37bSArne Jansen int ret; 46755d13a37bSArne Jansen int err; 46765d13a37bSArne Jansen u64 qgroupid; 46775d13a37bSArne Jansen 46785d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 46795d13a37bSArne Jansen return -EPERM; 46805d13a37bSArne Jansen 4681905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4682905b0ddaSMiao Xie if (ret) 4683905b0ddaSMiao Xie return ret; 46845d13a37bSArne Jansen 46855d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4686905b0ddaSMiao Xie if (IS_ERR(sa)) { 4687905b0ddaSMiao Xie ret = PTR_ERR(sa); 4688905b0ddaSMiao Xie goto drop_write; 4689905b0ddaSMiao Xie } 46905d13a37bSArne Jansen 46915d13a37bSArne Jansen trans = btrfs_join_transaction(root); 46925d13a37bSArne Jansen if (IS_ERR(trans)) { 46935d13a37bSArne Jansen ret = PTR_ERR(trans); 46945d13a37bSArne Jansen goto out; 46955d13a37bSArne Jansen } 46965d13a37bSArne Jansen 46975d13a37bSArne Jansen qgroupid = sa->qgroupid; 46985d13a37bSArne Jansen if (!qgroupid) { 46995d13a37bSArne Jansen /* take the current subvol as qgroup */ 47005d13a37bSArne Jansen qgroupid = root->root_key.objectid; 47015d13a37bSArne Jansen } 47025d13a37bSArne Jansen 4703f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 47045d13a37bSArne Jansen 47053a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 47065d13a37bSArne Jansen if (err && !ret) 47075d13a37bSArne Jansen ret = err; 47085d13a37bSArne Jansen 47095d13a37bSArne Jansen out: 47105d13a37bSArne Jansen kfree(sa); 4711905b0ddaSMiao Xie drop_write: 4712905b0ddaSMiao Xie mnt_drop_write_file(file); 47135d13a37bSArne Jansen return ret; 47145d13a37bSArne Jansen } 47155d13a37bSArne Jansen 47162f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 47172f232036SJan Schmidt { 47180b246afaSJeff Mahoney struct inode *inode = file_inode(file); 47190b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 47202f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 47212f232036SJan Schmidt int ret; 47222f232036SJan Schmidt 47232f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 47242f232036SJan Schmidt return -EPERM; 47252f232036SJan Schmidt 47262f232036SJan Schmidt ret = mnt_want_write_file(file); 47272f232036SJan Schmidt if (ret) 47282f232036SJan Schmidt return ret; 47292f232036SJan Schmidt 47302f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 47312f232036SJan Schmidt if (IS_ERR(qsa)) { 47322f232036SJan Schmidt ret = PTR_ERR(qsa); 47332f232036SJan Schmidt goto drop_write; 47342f232036SJan Schmidt } 47352f232036SJan Schmidt 47362f232036SJan Schmidt if (qsa->flags) { 47372f232036SJan Schmidt ret = -EINVAL; 47382f232036SJan Schmidt goto out; 47392f232036SJan Schmidt } 47402f232036SJan Schmidt 47410b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 47422f232036SJan Schmidt 47432f232036SJan Schmidt out: 47442f232036SJan Schmidt kfree(qsa); 47452f232036SJan Schmidt drop_write: 47462f232036SJan Schmidt mnt_drop_write_file(file); 47472f232036SJan Schmidt return ret; 47482f232036SJan Schmidt } 47492f232036SJan Schmidt 4750b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4751b929c1d8SMarcos Paulo de Souza void __user *arg) 47522f232036SJan Schmidt { 47530afb603aSGoldwyn Rodrigues struct btrfs_ioctl_quota_rescan_args qsa = {0}; 47542f232036SJan Schmidt 47552f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 47562f232036SJan Schmidt return -EPERM; 47572f232036SJan Schmidt 47580b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 47590afb603aSGoldwyn Rodrigues qsa.flags = 1; 47600afb603aSGoldwyn Rodrigues qsa.progress = fs_info->qgroup_rescan_progress.objectid; 47612f232036SJan Schmidt } 47622f232036SJan Schmidt 47630afb603aSGoldwyn Rodrigues if (copy_to_user(arg, &qsa, sizeof(qsa))) 4764991a3daeSAnand Jain return -EFAULT; 47652f232036SJan Schmidt 4766991a3daeSAnand Jain return 0; 47672f232036SJan Schmidt } 47682f232036SJan Schmidt 4769b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4770b929c1d8SMarcos Paulo de Souza void __user *arg) 477157254b6eSJan Schmidt { 477257254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 477357254b6eSJan Schmidt return -EPERM; 477457254b6eSJan Schmidt 47750b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 477657254b6eSJan Schmidt } 477757254b6eSJan Schmidt 4778abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4779e4fed17aSChristian Brauner struct user_namespace *mnt_userns, 4780abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 47818ea05e3aSAlexander Block { 4782496ad9aaSAl Viro struct inode *inode = file_inode(file); 47830b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 47848ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 47858ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 47868ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 478795582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 47888ea05e3aSAlexander Block int ret = 0; 4789dd5f9615SStefan Behrens int received_uuid_changed; 47908ea05e3aSAlexander Block 4791e4fed17aSChristian Brauner if (!inode_owner_or_capable(mnt_userns, inode)) 4792bd60ea0fSDavid Sterba return -EPERM; 4793bd60ea0fSDavid Sterba 47948ea05e3aSAlexander Block ret = mnt_want_write_file(file); 47958ea05e3aSAlexander Block if (ret < 0) 47968ea05e3aSAlexander Block return ret; 47978ea05e3aSAlexander Block 47980b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 47998ea05e3aSAlexander Block 48004a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 48018ea05e3aSAlexander Block ret = -EINVAL; 48028ea05e3aSAlexander Block goto out; 48038ea05e3aSAlexander Block } 48048ea05e3aSAlexander Block 48058ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 48068ea05e3aSAlexander Block ret = -EROFS; 48078ea05e3aSAlexander Block goto out; 48088ea05e3aSAlexander Block } 48098ea05e3aSAlexander Block 4810dd5f9615SStefan Behrens /* 4811dd5f9615SStefan Behrens * 1 - root item 4812dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4813dd5f9615SStefan Behrens */ 4814dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 48158ea05e3aSAlexander Block if (IS_ERR(trans)) { 48168ea05e3aSAlexander Block ret = PTR_ERR(trans); 48178ea05e3aSAlexander Block trans = NULL; 48188ea05e3aSAlexander Block goto out; 48198ea05e3aSAlexander Block } 48208ea05e3aSAlexander Block 48218ea05e3aSAlexander Block sa->rtransid = trans->transid; 48228ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 48238ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 48248ea05e3aSAlexander Block 4825dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4826dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4827dd5f9615SStefan Behrens if (received_uuid_changed && 4828d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4829d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4830dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4831dd5f9615SStefan Behrens root->root_key.objectid); 4832d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4833d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4834d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4835d87ff758SNikolay Borisov goto out; 4836d87ff758SNikolay Borisov } 4837d87ff758SNikolay Borisov } 48388ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 48398ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 48408ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 48413cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 48423cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 48433cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 48443cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 48458ea05e3aSAlexander Block 48460b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 48478ea05e3aSAlexander Block &root->root_key, &root->root_item); 48488ea05e3aSAlexander Block if (ret < 0) { 48493a45bb20SJeff Mahoney btrfs_end_transaction(trans); 48508ea05e3aSAlexander Block goto out; 4851dd5f9615SStefan Behrens } 4852dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4853cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4854dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4855dd5f9615SStefan Behrens root->root_key.objectid); 4856dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 485766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4858efd38150SNikolay Borisov btrfs_end_transaction(trans); 4859dd5f9615SStefan Behrens goto out; 4860dd5f9615SStefan Behrens } 4861dd5f9615SStefan Behrens } 48623a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4863abccd00fSHugo Mills out: 48640b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4865abccd00fSHugo Mills mnt_drop_write_file(file); 4866abccd00fSHugo Mills return ret; 4867abccd00fSHugo Mills } 4868abccd00fSHugo Mills 4869abccd00fSHugo Mills #ifdef CONFIG_64BIT 4870abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4871abccd00fSHugo Mills void __user *arg) 4872abccd00fSHugo Mills { 4873abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4874abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4875abccd00fSHugo Mills int ret = 0; 4876abccd00fSHugo Mills 4877abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 48787b9ea627SShailendra Verma if (IS_ERR(args32)) 48797b9ea627SShailendra Verma return PTR_ERR(args32); 4880abccd00fSHugo Mills 48818d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 488284dbeb87SDan Carpenter if (!args64) { 488384dbeb87SDan Carpenter ret = -ENOMEM; 4884abccd00fSHugo Mills goto out; 4885abccd00fSHugo Mills } 4886abccd00fSHugo Mills 4887abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4888abccd00fSHugo Mills args64->stransid = args32->stransid; 4889abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4890abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4891abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4892abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4893abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4894abccd00fSHugo Mills args64->flags = args32->flags; 4895abccd00fSHugo Mills 4896e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), args64); 4897abccd00fSHugo Mills if (ret) 4898abccd00fSHugo Mills goto out; 4899abccd00fSHugo Mills 4900abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4901abccd00fSHugo Mills args32->stransid = args64->stransid; 4902abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4903abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4904abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4905abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4906abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4907abccd00fSHugo Mills args32->flags = args64->flags; 4908abccd00fSHugo Mills 4909abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4910abccd00fSHugo Mills if (ret) 4911abccd00fSHugo Mills ret = -EFAULT; 4912abccd00fSHugo Mills 4913abccd00fSHugo Mills out: 4914abccd00fSHugo Mills kfree(args32); 4915abccd00fSHugo Mills kfree(args64); 4916abccd00fSHugo Mills return ret; 4917abccd00fSHugo Mills } 4918abccd00fSHugo Mills #endif 4919abccd00fSHugo Mills 4920abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4921abccd00fSHugo Mills void __user *arg) 4922abccd00fSHugo Mills { 4923abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4924abccd00fSHugo Mills int ret = 0; 4925abccd00fSHugo Mills 4926abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 49277b9ea627SShailendra Verma if (IS_ERR(sa)) 49287b9ea627SShailendra Verma return PTR_ERR(sa); 4929abccd00fSHugo Mills 4930e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), sa); 4931abccd00fSHugo Mills 4932abccd00fSHugo Mills if (ret) 4933abccd00fSHugo Mills goto out; 4934abccd00fSHugo Mills 49358ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 49368ea05e3aSAlexander Block if (ret) 49378ea05e3aSAlexander Block ret = -EFAULT; 49388ea05e3aSAlexander Block 49398ea05e3aSAlexander Block out: 49408ea05e3aSAlexander Block kfree(sa); 49418ea05e3aSAlexander Block return ret; 49428ea05e3aSAlexander Block } 49438ea05e3aSAlexander Block 4944b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4945b929c1d8SMarcos Paulo de Souza void __user *arg) 4946867ab667Sjeff.liu { 4947a1b83ac5SAnand Jain size_t len; 4948867ab667Sjeff.liu int ret; 4949a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4950a1b83ac5SAnand Jain 49510b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 49520b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 49530b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4954a1b83ac5SAnand Jain 4955a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4956867ab667Sjeff.liu 4957867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 49580b246afaSJeff Mahoney btrfs_warn(fs_info, 49590b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 49600b246afaSJeff Mahoney --len); 4961867ab667Sjeff.liu } 4962867ab667Sjeff.liu 4963867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4964867ab667Sjeff.liu 4965867ab667Sjeff.liu return ret ? -EFAULT : 0; 4966867ab667Sjeff.liu } 4967867ab667Sjeff.liu 4968a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4969a8bfd4abSjeff.liu { 49700b246afaSJeff Mahoney struct inode *inode = file_inode(file); 49710b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 49720b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 49730b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4974a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4975a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4976a8bfd4abSjeff.liu int ret; 4977a8bfd4abSjeff.liu 4978a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4979a8bfd4abSjeff.liu return -EPERM; 4980a8bfd4abSjeff.liu 4981a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4982a8bfd4abSjeff.liu return -EFAULT; 4983a8bfd4abSjeff.liu 4984a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 49850b246afaSJeff Mahoney btrfs_err(fs_info, 49865d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4987a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4988a8bfd4abSjeff.liu return -EINVAL; 4989a8bfd4abSjeff.liu } 4990a8bfd4abSjeff.liu 4991a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4992a8bfd4abSjeff.liu if (ret) 4993a8bfd4abSjeff.liu return ret; 4994a8bfd4abSjeff.liu 4995a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4996a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4997a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4998a8bfd4abSjeff.liu goto out_unlock; 4999a8bfd4abSjeff.liu } 5000a8bfd4abSjeff.liu 50010b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 5002a8bfd4abSjeff.liu strcpy(super_block->label, label); 50030b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 50043a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 5005a8bfd4abSjeff.liu 5006a8bfd4abSjeff.liu out_unlock: 5007a8bfd4abSjeff.liu mnt_drop_write_file(file); 5008a8bfd4abSjeff.liu return ret; 5009a8bfd4abSjeff.liu } 5010a8bfd4abSjeff.liu 50112eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 50122eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 50132eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 50142eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 50152eaa055fSJeff Mahoney 5016d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 50172eaa055fSJeff Mahoney { 50184d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 50192eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 50202eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 50212eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 50222eaa055fSJeff Mahoney }; 50232eaa055fSJeff Mahoney 50242eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 50252eaa055fSJeff Mahoney return -EFAULT; 50262eaa055fSJeff Mahoney 50272eaa055fSJeff Mahoney return 0; 50282eaa055fSJeff Mahoney } 50292eaa055fSJeff Mahoney 5030b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 5031b929c1d8SMarcos Paulo de Souza void __user *arg) 50322eaa055fSJeff Mahoney { 50330b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 50342eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 50352eaa055fSJeff Mahoney 50362eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 50372eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 50382eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 50392eaa055fSJeff Mahoney 50402eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 50412eaa055fSJeff Mahoney return -EFAULT; 50422eaa055fSJeff Mahoney 50432eaa055fSJeff Mahoney return 0; 50442eaa055fSJeff Mahoney } 50452eaa055fSJeff Mahoney 50462ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 50473b02a68aSJeff Mahoney enum btrfs_feature_set set, 50482eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 50492eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 50502eaa055fSJeff Mahoney { 5051f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 50523b02a68aSJeff Mahoney char *names; 50532eaa055fSJeff Mahoney u64 disallowed, unsupported; 50542eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 50552eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 50562eaa055fSJeff Mahoney 50572eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 50582eaa055fSJeff Mahoney if (unsupported) { 50593b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 50603b02a68aSJeff Mahoney if (names) { 50610b246afaSJeff Mahoney btrfs_warn(fs_info, 50623b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 50633b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 50643b02a68aSJeff Mahoney kfree(names); 50653b02a68aSJeff Mahoney } else 50660b246afaSJeff Mahoney btrfs_warn(fs_info, 50672eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 50682eaa055fSJeff Mahoney type, unsupported); 50692eaa055fSJeff Mahoney return -EOPNOTSUPP; 50702eaa055fSJeff Mahoney } 50712eaa055fSJeff Mahoney 50722eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 50732eaa055fSJeff Mahoney if (disallowed) { 50743b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 50753b02a68aSJeff Mahoney if (names) { 50760b246afaSJeff Mahoney btrfs_warn(fs_info, 50773b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 50783b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 50793b02a68aSJeff Mahoney kfree(names); 50803b02a68aSJeff Mahoney } else 50810b246afaSJeff Mahoney btrfs_warn(fs_info, 50822eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 50832eaa055fSJeff Mahoney type, disallowed); 50842eaa055fSJeff Mahoney return -EPERM; 50852eaa055fSJeff Mahoney } 50862eaa055fSJeff Mahoney 50872eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 50882eaa055fSJeff Mahoney if (disallowed) { 50893b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 50903b02a68aSJeff Mahoney if (names) { 50910b246afaSJeff Mahoney btrfs_warn(fs_info, 50923b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 50933b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 50943b02a68aSJeff Mahoney kfree(names); 50953b02a68aSJeff Mahoney } else 50960b246afaSJeff Mahoney btrfs_warn(fs_info, 50972eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 50982eaa055fSJeff Mahoney type, disallowed); 50992eaa055fSJeff Mahoney return -EPERM; 51002eaa055fSJeff Mahoney } 51012eaa055fSJeff Mahoney 51022eaa055fSJeff Mahoney return 0; 51032eaa055fSJeff Mahoney } 51042eaa055fSJeff Mahoney 51052ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 51062ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 51072eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 51082eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 51092eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 51102eaa055fSJeff Mahoney 51112eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 51122eaa055fSJeff Mahoney { 51130b246afaSJeff Mahoney struct inode *inode = file_inode(file); 51140b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 51150b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 51160b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 51172eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 51182eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 51192eaa055fSJeff Mahoney u64 newflags; 51202eaa055fSJeff Mahoney int ret; 51212eaa055fSJeff Mahoney 51222eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 51232eaa055fSJeff Mahoney return -EPERM; 51242eaa055fSJeff Mahoney 51252eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 51262eaa055fSJeff Mahoney return -EFAULT; 51272eaa055fSJeff Mahoney 51282eaa055fSJeff Mahoney /* Nothing to do */ 51292eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 51302eaa055fSJeff Mahoney !flags[0].incompat_flags) 51312eaa055fSJeff Mahoney return 0; 51322eaa055fSJeff Mahoney 51332ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 51342eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 51352eaa055fSJeff Mahoney if (ret) 51362eaa055fSJeff Mahoney return ret; 51372eaa055fSJeff Mahoney 51382ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 51392eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 51402eaa055fSJeff Mahoney if (ret) 51412eaa055fSJeff Mahoney return ret; 51422eaa055fSJeff Mahoney 51432ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 51442eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 51452eaa055fSJeff Mahoney if (ret) 51462eaa055fSJeff Mahoney return ret; 51472eaa055fSJeff Mahoney 51487ab19625SDavid Sterba ret = mnt_want_write_file(file); 51497ab19625SDavid Sterba if (ret) 51507ab19625SDavid Sterba return ret; 51517ab19625SDavid Sterba 51528051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 51537ab19625SDavid Sterba if (IS_ERR(trans)) { 51547ab19625SDavid Sterba ret = PTR_ERR(trans); 51557ab19625SDavid Sterba goto out_drop_write; 51567ab19625SDavid Sterba } 51572eaa055fSJeff Mahoney 51580b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 51592eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 51602eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 51612eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 51622eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 51632eaa055fSJeff Mahoney 51642eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 51652eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 51662eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 51672eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 51682eaa055fSJeff Mahoney 51692eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 51702eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 51712eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 51722eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 51730b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 51742eaa055fSJeff Mahoney 51753a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 51767ab19625SDavid Sterba out_drop_write: 51777ab19625SDavid Sterba mnt_drop_write_file(file); 51787ab19625SDavid Sterba 51797ab19625SDavid Sterba return ret; 51802eaa055fSJeff Mahoney } 51812eaa055fSJeff Mahoney 51829ad12305SSahil Kang static int _btrfs_ioctl_send(struct inode *inode, void __user *argp, bool compat) 51832351f431SJosef Bacik { 51842351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 51852351f431SJosef Bacik int ret; 51862351f431SJosef Bacik 51872351f431SJosef Bacik if (compat) { 51882351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 51892351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 51902351f431SJosef Bacik 51912351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 51922351f431SJosef Bacik if (ret) 51932351f431SJosef Bacik return -EFAULT; 51942351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 51952351f431SJosef Bacik if (!arg) 51962351f431SJosef Bacik return -ENOMEM; 51972351f431SJosef Bacik arg->send_fd = args32.send_fd; 51982351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 51992351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 52002351f431SJosef Bacik arg->parent_root = args32.parent_root; 52012351f431SJosef Bacik arg->flags = args32.flags; 52022351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 52032351f431SJosef Bacik sizeof(args32.reserved)); 52042351f431SJosef Bacik #else 52052351f431SJosef Bacik return -ENOTTY; 52062351f431SJosef Bacik #endif 52072351f431SJosef Bacik } else { 52082351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 52092351f431SJosef Bacik if (IS_ERR(arg)) 52102351f431SJosef Bacik return PTR_ERR(arg); 52112351f431SJosef Bacik } 52129ad12305SSahil Kang ret = btrfs_ioctl_send(inode, arg); 52132351f431SJosef Bacik kfree(arg); 52142351f431SJosef Bacik return ret; 52152351f431SJosef Bacik } 52162351f431SJosef Bacik 52171881fba8SOmar Sandoval static int btrfs_ioctl_encoded_read(struct file *file, void __user *argp, 52181881fba8SOmar Sandoval bool compat) 52191881fba8SOmar Sandoval { 52201881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args args = { 0 }; 52211881fba8SOmar Sandoval size_t copy_end_kernel = offsetofend(struct btrfs_ioctl_encoded_io_args, 52221881fba8SOmar Sandoval flags); 52231881fba8SOmar Sandoval size_t copy_end; 52241881fba8SOmar Sandoval struct iovec iovstack[UIO_FASTIOV]; 52251881fba8SOmar Sandoval struct iovec *iov = iovstack; 52261881fba8SOmar Sandoval struct iov_iter iter; 52271881fba8SOmar Sandoval loff_t pos; 52281881fba8SOmar Sandoval struct kiocb kiocb; 52291881fba8SOmar Sandoval ssize_t ret; 52301881fba8SOmar Sandoval 52311881fba8SOmar Sandoval if (!capable(CAP_SYS_ADMIN)) { 52321881fba8SOmar Sandoval ret = -EPERM; 52331881fba8SOmar Sandoval goto out_acct; 52341881fba8SOmar Sandoval } 52351881fba8SOmar Sandoval 52361881fba8SOmar Sandoval if (compat) { 52371881fba8SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 52381881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 args32; 52391881fba8SOmar Sandoval 52401881fba8SOmar Sandoval copy_end = offsetofend(struct btrfs_ioctl_encoded_io_args_32, 52411881fba8SOmar Sandoval flags); 52421881fba8SOmar Sandoval if (copy_from_user(&args32, argp, copy_end)) { 52431881fba8SOmar Sandoval ret = -EFAULT; 52441881fba8SOmar Sandoval goto out_acct; 52451881fba8SOmar Sandoval } 52461881fba8SOmar Sandoval args.iov = compat_ptr(args32.iov); 52471881fba8SOmar Sandoval args.iovcnt = args32.iovcnt; 52481881fba8SOmar Sandoval args.offset = args32.offset; 52491881fba8SOmar Sandoval args.flags = args32.flags; 52501881fba8SOmar Sandoval #else 52511881fba8SOmar Sandoval return -ENOTTY; 52521881fba8SOmar Sandoval #endif 52531881fba8SOmar Sandoval } else { 52541881fba8SOmar Sandoval copy_end = copy_end_kernel; 52551881fba8SOmar Sandoval if (copy_from_user(&args, argp, copy_end)) { 52561881fba8SOmar Sandoval ret = -EFAULT; 52571881fba8SOmar Sandoval goto out_acct; 52581881fba8SOmar Sandoval } 52591881fba8SOmar Sandoval } 52601881fba8SOmar Sandoval if (args.flags != 0) { 52611881fba8SOmar Sandoval ret = -EINVAL; 52621881fba8SOmar Sandoval goto out_acct; 52631881fba8SOmar Sandoval } 52641881fba8SOmar Sandoval 52651881fba8SOmar Sandoval ret = import_iovec(READ, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), 52661881fba8SOmar Sandoval &iov, &iter); 52671881fba8SOmar Sandoval if (ret < 0) 52681881fba8SOmar Sandoval goto out_acct; 52691881fba8SOmar Sandoval 52701881fba8SOmar Sandoval if (iov_iter_count(&iter) == 0) { 52711881fba8SOmar Sandoval ret = 0; 52721881fba8SOmar Sandoval goto out_iov; 52731881fba8SOmar Sandoval } 52741881fba8SOmar Sandoval pos = args.offset; 52751881fba8SOmar Sandoval ret = rw_verify_area(READ, file, &pos, args.len); 52761881fba8SOmar Sandoval if (ret < 0) 52771881fba8SOmar Sandoval goto out_iov; 52781881fba8SOmar Sandoval 52791881fba8SOmar Sandoval init_sync_kiocb(&kiocb, file); 52801881fba8SOmar Sandoval kiocb.ki_pos = pos; 52811881fba8SOmar Sandoval 52821881fba8SOmar Sandoval ret = btrfs_encoded_read(&kiocb, &iter, &args); 52831881fba8SOmar Sandoval if (ret >= 0) { 52841881fba8SOmar Sandoval fsnotify_access(file); 52851881fba8SOmar Sandoval if (copy_to_user(argp + copy_end, 52861881fba8SOmar Sandoval (char *)&args + copy_end_kernel, 52871881fba8SOmar Sandoval sizeof(args) - copy_end_kernel)) 52881881fba8SOmar Sandoval ret = -EFAULT; 52891881fba8SOmar Sandoval } 52901881fba8SOmar Sandoval 52911881fba8SOmar Sandoval out_iov: 52921881fba8SOmar Sandoval kfree(iov); 52931881fba8SOmar Sandoval out_acct: 52941881fba8SOmar Sandoval if (ret > 0) 52951881fba8SOmar Sandoval add_rchar(current, ret); 52961881fba8SOmar Sandoval inc_syscr(current); 52971881fba8SOmar Sandoval return ret; 52981881fba8SOmar Sandoval } 52991881fba8SOmar Sandoval 5300*7c0c7269SOmar Sandoval static int btrfs_ioctl_encoded_write(struct file *file, void __user *argp, bool compat) 5301*7c0c7269SOmar Sandoval { 5302*7c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args args; 5303*7c0c7269SOmar Sandoval struct iovec iovstack[UIO_FASTIOV]; 5304*7c0c7269SOmar Sandoval struct iovec *iov = iovstack; 5305*7c0c7269SOmar Sandoval struct iov_iter iter; 5306*7c0c7269SOmar Sandoval loff_t pos; 5307*7c0c7269SOmar Sandoval struct kiocb kiocb; 5308*7c0c7269SOmar Sandoval ssize_t ret; 5309*7c0c7269SOmar Sandoval 5310*7c0c7269SOmar Sandoval if (!capable(CAP_SYS_ADMIN)) { 5311*7c0c7269SOmar Sandoval ret = -EPERM; 5312*7c0c7269SOmar Sandoval goto out_acct; 5313*7c0c7269SOmar Sandoval } 5314*7c0c7269SOmar Sandoval 5315*7c0c7269SOmar Sandoval if (!(file->f_mode & FMODE_WRITE)) { 5316*7c0c7269SOmar Sandoval ret = -EBADF; 5317*7c0c7269SOmar Sandoval goto out_acct; 5318*7c0c7269SOmar Sandoval } 5319*7c0c7269SOmar Sandoval 5320*7c0c7269SOmar Sandoval if (compat) { 5321*7c0c7269SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 5322*7c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 args32; 5323*7c0c7269SOmar Sandoval 5324*7c0c7269SOmar Sandoval if (copy_from_user(&args32, argp, sizeof(args32))) { 5325*7c0c7269SOmar Sandoval ret = -EFAULT; 5326*7c0c7269SOmar Sandoval goto out_acct; 5327*7c0c7269SOmar Sandoval } 5328*7c0c7269SOmar Sandoval args.iov = compat_ptr(args32.iov); 5329*7c0c7269SOmar Sandoval args.iovcnt = args32.iovcnt; 5330*7c0c7269SOmar Sandoval args.offset = args32.offset; 5331*7c0c7269SOmar Sandoval args.flags = args32.flags; 5332*7c0c7269SOmar Sandoval args.len = args32.len; 5333*7c0c7269SOmar Sandoval args.unencoded_len = args32.unencoded_len; 5334*7c0c7269SOmar Sandoval args.unencoded_offset = args32.unencoded_offset; 5335*7c0c7269SOmar Sandoval args.compression = args32.compression; 5336*7c0c7269SOmar Sandoval args.encryption = args32.encryption; 5337*7c0c7269SOmar Sandoval memcpy(args.reserved, args32.reserved, sizeof(args.reserved)); 5338*7c0c7269SOmar Sandoval #else 5339*7c0c7269SOmar Sandoval return -ENOTTY; 5340*7c0c7269SOmar Sandoval #endif 5341*7c0c7269SOmar Sandoval } else { 5342*7c0c7269SOmar Sandoval if (copy_from_user(&args, argp, sizeof(args))) { 5343*7c0c7269SOmar Sandoval ret = -EFAULT; 5344*7c0c7269SOmar Sandoval goto out_acct; 5345*7c0c7269SOmar Sandoval } 5346*7c0c7269SOmar Sandoval } 5347*7c0c7269SOmar Sandoval 5348*7c0c7269SOmar Sandoval ret = -EINVAL; 5349*7c0c7269SOmar Sandoval if (args.flags != 0) 5350*7c0c7269SOmar Sandoval goto out_acct; 5351*7c0c7269SOmar Sandoval if (memchr_inv(args.reserved, 0, sizeof(args.reserved))) 5352*7c0c7269SOmar Sandoval goto out_acct; 5353*7c0c7269SOmar Sandoval if (args.compression == BTRFS_ENCODED_IO_COMPRESSION_NONE && 5354*7c0c7269SOmar Sandoval args.encryption == BTRFS_ENCODED_IO_ENCRYPTION_NONE) 5355*7c0c7269SOmar Sandoval goto out_acct; 5356*7c0c7269SOmar Sandoval if (args.compression >= BTRFS_ENCODED_IO_COMPRESSION_TYPES || 5357*7c0c7269SOmar Sandoval args.encryption >= BTRFS_ENCODED_IO_ENCRYPTION_TYPES) 5358*7c0c7269SOmar Sandoval goto out_acct; 5359*7c0c7269SOmar Sandoval if (args.unencoded_offset > args.unencoded_len) 5360*7c0c7269SOmar Sandoval goto out_acct; 5361*7c0c7269SOmar Sandoval if (args.len > args.unencoded_len - args.unencoded_offset) 5362*7c0c7269SOmar Sandoval goto out_acct; 5363*7c0c7269SOmar Sandoval 5364*7c0c7269SOmar Sandoval ret = import_iovec(WRITE, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), 5365*7c0c7269SOmar Sandoval &iov, &iter); 5366*7c0c7269SOmar Sandoval if (ret < 0) 5367*7c0c7269SOmar Sandoval goto out_acct; 5368*7c0c7269SOmar Sandoval 5369*7c0c7269SOmar Sandoval file_start_write(file); 5370*7c0c7269SOmar Sandoval 5371*7c0c7269SOmar Sandoval if (iov_iter_count(&iter) == 0) { 5372*7c0c7269SOmar Sandoval ret = 0; 5373*7c0c7269SOmar Sandoval goto out_end_write; 5374*7c0c7269SOmar Sandoval } 5375*7c0c7269SOmar Sandoval pos = args.offset; 5376*7c0c7269SOmar Sandoval ret = rw_verify_area(WRITE, file, &pos, args.len); 5377*7c0c7269SOmar Sandoval if (ret < 0) 5378*7c0c7269SOmar Sandoval goto out_end_write; 5379*7c0c7269SOmar Sandoval 5380*7c0c7269SOmar Sandoval init_sync_kiocb(&kiocb, file); 5381*7c0c7269SOmar Sandoval ret = kiocb_set_rw_flags(&kiocb, 0); 5382*7c0c7269SOmar Sandoval if (ret) 5383*7c0c7269SOmar Sandoval goto out_end_write; 5384*7c0c7269SOmar Sandoval kiocb.ki_pos = pos; 5385*7c0c7269SOmar Sandoval 5386*7c0c7269SOmar Sandoval ret = btrfs_do_write_iter(&kiocb, &iter, &args); 5387*7c0c7269SOmar Sandoval if (ret > 0) 5388*7c0c7269SOmar Sandoval fsnotify_modify(file); 5389*7c0c7269SOmar Sandoval 5390*7c0c7269SOmar Sandoval out_end_write: 5391*7c0c7269SOmar Sandoval file_end_write(file); 5392*7c0c7269SOmar Sandoval kfree(iov); 5393*7c0c7269SOmar Sandoval out_acct: 5394*7c0c7269SOmar Sandoval if (ret > 0) 5395*7c0c7269SOmar Sandoval add_wchar(current, ret); 5396*7c0c7269SOmar Sandoval inc_syscw(current); 5397*7c0c7269SOmar Sandoval return ret; 5398*7c0c7269SOmar Sandoval } 5399*7c0c7269SOmar Sandoval 5400f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 5401f46b5a66SChristoph Hellwig cmd, unsigned long arg) 5402f46b5a66SChristoph Hellwig { 54030b246afaSJeff Mahoney struct inode *inode = file_inode(file); 54040b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 54050b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 54064bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 5407f46b5a66SChristoph Hellwig 5408f46b5a66SChristoph Hellwig switch (cmd) { 54096cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 5410dc408ccdSSahil Kang return btrfs_ioctl_getversion(inode, argp); 541140cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 5412b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 541340cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 541440cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 5415f7039b1dSLi Dongyang case FITRIM: 5416b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 5417f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 5418fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 5419fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 5420fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 54213de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 5422fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 54236f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 54246f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 542576dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 5426949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 5427949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 5428949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 54290caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 54309ad12305SSahil Kang return btrfs_ioctl_subvol_getflags(inode, argp); 54310caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 54320caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 54336ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 54346ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 5435f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 54361e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 54371e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 54381e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 5439f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 5440198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 5441f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 54422ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 5443f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 5444da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 54456b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 54466b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 5447475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 54482ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 5449475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 54502ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 5451f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 54529ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 5453ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 54549ad12305SSahil Kang return btrfs_ioctl_tree_search(inode, argp); 5455cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 54569ad12305SSahil Kang return btrfs_ioctl_tree_search_v2(inode, argp); 5457ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 5458dc408ccdSSahil Kang return btrfs_ioctl_ino_lookup(root, argp); 5459d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 5460d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 5461d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 5462d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 5463d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 5464d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 54651406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 54662ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 54679b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 54689b199859SFilipe David Borba Manana int ret; 54699b199859SFilipe David Borba Manana 54709db4dc24SNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 54719b199859SFilipe David Borba Manana if (ret) 54729b199859SFilipe David Borba Manana return ret; 54730b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 54742fad4e83SDavid Sterba /* 54752fad4e83SDavid Sterba * The transaction thread may want to do more work, 547601327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 54772fad4e83SDavid Sterba * processing uncleaned subvols. 54782fad4e83SDavid Sterba */ 54790b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 54809b199859SFilipe David Borba Manana return ret; 54819b199859SFilipe David Borba Manana } 548246204592SSage Weil case BTRFS_IOC_START_SYNC: 54839a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 548446204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 54852ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 5486475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 5487b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 5488475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 54892ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 5490475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 54912ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 5492c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 54939ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 5494837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 54952ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 549619a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 54972ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 54988ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 54998ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 5500abccd00fSHugo Mills #ifdef CONFIG_64BIT 5501abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 5502abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 5503abccd00fSHugo Mills #endif 550431db9f7cSAlexander Block case BTRFS_IOC_SEND: 55059ad12305SSahil Kang return _btrfs_ioctl_send(inode, argp, false); 55062351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 55072351f431SJosef Bacik case BTRFS_IOC_SEND_32: 55089ad12305SSahil Kang return _btrfs_ioctl_send(inode, argp, true); 55092351f431SJosef Bacik #endif 5510c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 55112ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 55125d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5513905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 55145d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5515905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 55165d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5517905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 55185d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5519905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 55202f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 55212f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 55222f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 5523b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 552457254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 5525b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 55263f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 55272ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 55282eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 5529d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 55302eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 5531b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 55322eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 55332eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5534b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 55359ad12305SSahil Kang return btrfs_ioctl_get_subvol_info(inode, argp); 553642e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 5537dc408ccdSSahil Kang return btrfs_ioctl_get_subvol_rootref(root, argp); 553823d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 553923d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 554014605409SBoris Burkov case FS_IOC_ENABLE_VERITY: 554114605409SBoris Burkov return fsverity_ioctl_enable(file, (const void __user *)argp); 554214605409SBoris Burkov case FS_IOC_MEASURE_VERITY: 554314605409SBoris Burkov return fsverity_ioctl_measure(file, argp); 55441881fba8SOmar Sandoval case BTRFS_IOC_ENCODED_READ: 55451881fba8SOmar Sandoval return btrfs_ioctl_encoded_read(file, argp, false); 5546*7c0c7269SOmar Sandoval case BTRFS_IOC_ENCODED_WRITE: 5547*7c0c7269SOmar Sandoval return btrfs_ioctl_encoded_write(file, argp, false); 55481881fba8SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 55491881fba8SOmar Sandoval case BTRFS_IOC_ENCODED_READ_32: 55501881fba8SOmar Sandoval return btrfs_ioctl_encoded_read(file, argp, true); 5551*7c0c7269SOmar Sandoval case BTRFS_IOC_ENCODED_WRITE_32: 5552*7c0c7269SOmar Sandoval return btrfs_ioctl_encoded_write(file, argp, true); 55531881fba8SOmar Sandoval #endif 5554f46b5a66SChristoph Hellwig } 5555f46b5a66SChristoph Hellwig 5556f46b5a66SChristoph Hellwig return -ENOTTY; 5557f46b5a66SChristoph Hellwig } 55584c63c245SLuke Dashjr 55594c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 55604c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 55614c63c245SLuke Dashjr { 55622a362249SJeff Mahoney /* 55632a362249SJeff Mahoney * These all access 32-bit values anyway so no further 55642a362249SJeff Mahoney * handling is necessary. 55652a362249SJeff Mahoney */ 55664c63c245SLuke Dashjr switch (cmd) { 55674c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 55684c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 55694c63c245SLuke Dashjr break; 55704c63c245SLuke Dashjr } 55714c63c245SLuke Dashjr 55724c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 55734c63c245SLuke Dashjr } 55744c63c245SLuke Dashjr #endif 5575