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" 53c7f13d42SJosef Bacik #include "fs.h" 5407e81dc9SJosef Bacik #include "accessors.h" 55a0231804SJosef Bacik #include "extent-tree.h" 5645c40c8fSJosef Bacik #include "root-tree.h" 5759b818e0SJosef Bacik #include "defrag.h" 58f2b39277SJosef Bacik #include "dir-item.h" 59c7a03b52SJosef Bacik #include "uuid-tree.h" 607572dec8SJosef Bacik #include "ioctl.h" 61*af142b6fSJosef Bacik #include "file.h" 62f46b5a66SChristoph Hellwig 63abccd00fSHugo Mills #ifdef CONFIG_64BIT 64abccd00fSHugo Mills /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI 65abccd00fSHugo Mills * structures are incorrect, as the timespec structure from userspace 66abccd00fSHugo Mills * is 4 bytes too small. We define these alternatives here to teach 67abccd00fSHugo Mills * the kernel about the 32-bit struct packing. 68abccd00fSHugo Mills */ 69abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 { 70abccd00fSHugo Mills __u64 sec; 71abccd00fSHugo Mills __u32 nsec; 72abccd00fSHugo Mills } __attribute__ ((__packed__)); 73abccd00fSHugo Mills 74abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 { 75abccd00fSHugo Mills char uuid[BTRFS_UUID_SIZE]; /* in */ 76abccd00fSHugo Mills __u64 stransid; /* in */ 77abccd00fSHugo Mills __u64 rtransid; /* out */ 78abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 stime; /* in */ 79abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 rtime; /* out */ 80abccd00fSHugo Mills __u64 flags; /* in */ 81abccd00fSHugo Mills __u64 reserved[16]; /* in */ 82abccd00fSHugo Mills } __attribute__ ((__packed__)); 83abccd00fSHugo Mills 84abccd00fSHugo Mills #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ 85abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32) 86abccd00fSHugo Mills #endif 87abccd00fSHugo Mills 882351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 892351f431SJosef Bacik struct btrfs_ioctl_send_args_32 { 902351f431SJosef Bacik __s64 send_fd; /* in */ 912351f431SJosef Bacik __u64 clone_sources_count; /* in */ 922351f431SJosef Bacik compat_uptr_t clone_sources; /* in */ 932351f431SJosef Bacik __u64 parent_root; /* in */ 942351f431SJosef Bacik __u64 flags; /* in */ 95e77fbf99SDavid Sterba __u32 version; /* in */ 96e77fbf99SDavid Sterba __u8 reserved[28]; /* in */ 972351f431SJosef Bacik } __attribute__ ((__packed__)); 982351f431SJosef Bacik 992351f431SJosef Bacik #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \ 1002351f431SJosef Bacik struct btrfs_ioctl_send_args_32) 1011881fba8SOmar Sandoval 1021881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 { 1031881fba8SOmar Sandoval compat_uptr_t iov; 1041881fba8SOmar Sandoval compat_ulong_t iovcnt; 1051881fba8SOmar Sandoval __s64 offset; 1061881fba8SOmar Sandoval __u64 flags; 1071881fba8SOmar Sandoval __u64 len; 1081881fba8SOmar Sandoval __u64 unencoded_len; 1091881fba8SOmar Sandoval __u64 unencoded_offset; 1101881fba8SOmar Sandoval __u32 compression; 1111881fba8SOmar Sandoval __u32 encryption; 1121881fba8SOmar Sandoval __u8 reserved[64]; 1131881fba8SOmar Sandoval }; 1141881fba8SOmar Sandoval 1151881fba8SOmar Sandoval #define BTRFS_IOC_ENCODED_READ_32 _IOR(BTRFS_IOCTL_MAGIC, 64, \ 1161881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32) 1177c0c7269SOmar Sandoval #define BTRFS_IOC_ENCODED_WRITE_32 _IOW(BTRFS_IOCTL_MAGIC, 64, \ 1187c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32) 1192351f431SJosef Bacik #endif 120abccd00fSHugo Mills 1216cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 1221905a0f7SDavid Sterba static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode, 1231905a0f7SDavid Sterba unsigned int flags) 1246cbff00fSChristoph Hellwig { 1251905a0f7SDavid Sterba if (S_ISDIR(inode->i_mode)) 1266cbff00fSChristoph Hellwig return flags; 1271905a0f7SDavid Sterba else if (S_ISREG(inode->i_mode)) 1286cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 1296cbff00fSChristoph Hellwig else 1306cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 1316cbff00fSChristoph Hellwig } 132f46b5a66SChristoph Hellwig 1336cbff00fSChristoph Hellwig /* 134a157d4fdSDavid Sterba * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS 135a157d4fdSDavid Sterba * ioctl. 1366cbff00fSChristoph Hellwig */ 13777eea05eSBoris Burkov static unsigned int btrfs_inode_flags_to_fsflags(struct btrfs_inode *binode) 1386cbff00fSChristoph Hellwig { 1396cbff00fSChristoph Hellwig unsigned int iflags = 0; 14077eea05eSBoris Burkov u32 flags = binode->flags; 14114605409SBoris Burkov u32 ro_flags = binode->ro_flags; 1426cbff00fSChristoph Hellwig 1436cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 1446cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 1456cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 1466cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 1476cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 1486cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 1496cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 1506cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 1516cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 1526cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 1536cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 1546cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 155d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 156d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 15714605409SBoris Burkov if (ro_flags & BTRFS_INODE_RO_VERITY) 15814605409SBoris Burkov iflags |= FS_VERITY_FL; 159d0092bddSLi Zefan 16013f48dc9SSatoru Takeuchi if (flags & BTRFS_INODE_NOCOMPRESS) 161d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 16213f48dc9SSatoru Takeuchi else if (flags & BTRFS_INODE_COMPRESS) 16313f48dc9SSatoru Takeuchi iflags |= FS_COMPR_FL; 1646cbff00fSChristoph Hellwig 1656cbff00fSChristoph Hellwig return iflags; 1666cbff00fSChristoph Hellwig } 1676cbff00fSChristoph Hellwig 1686cbff00fSChristoph Hellwig /* 1696cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1706cbff00fSChristoph Hellwig */ 1717b6a221eSDavid Sterba void btrfs_sync_inode_flags_to_i_flags(struct inode *inode) 1726cbff00fSChristoph Hellwig { 1735c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 1743cc79392SFilipe Manana unsigned int new_fl = 0; 1756cbff00fSChristoph Hellwig 1765c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_SYNC) 1773cc79392SFilipe Manana new_fl |= S_SYNC; 1785c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_IMMUTABLE) 1793cc79392SFilipe Manana new_fl |= S_IMMUTABLE; 1805c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_APPEND) 1813cc79392SFilipe Manana new_fl |= S_APPEND; 1825c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_NOATIME) 1833cc79392SFilipe Manana new_fl |= S_NOATIME; 1845c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_DIRSYNC) 1853cc79392SFilipe Manana new_fl |= S_DIRSYNC; 18614605409SBoris Burkov if (binode->ro_flags & BTRFS_INODE_RO_VERITY) 18714605409SBoris Burkov new_fl |= S_VERITY; 1883cc79392SFilipe Manana 1893cc79392SFilipe Manana set_mask_bits(&inode->i_flags, 19014605409SBoris Burkov S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC | 19114605409SBoris Burkov S_VERITY, new_fl); 1926cbff00fSChristoph Hellwig } 1936cbff00fSChristoph Hellwig 194f37c563bSDavid Sterba /* 195f37c563bSDavid Sterba * Check if @flags are a supported and valid set of FS_*_FL flags and that 196f37c563bSDavid Sterba * the old and new flags are not conflicting 197f37c563bSDavid Sterba */ 198f37c563bSDavid Sterba static int check_fsflags(unsigned int old_flags, unsigned int flags) 19975e7cb7fSLiu Bo { 20075e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 20175e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 20275e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 203e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 204e1e8fb6aSLi Zefan FS_NOCOW_FL)) 20575e7cb7fSLiu Bo return -EOPNOTSUPP; 20675e7cb7fSLiu Bo 207f37c563bSDavid Sterba /* COMPR and NOCOMP on new/old are valid */ 20875e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 20975e7cb7fSLiu Bo return -EINVAL; 21075e7cb7fSLiu Bo 211f37c563bSDavid Sterba if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL)) 212f37c563bSDavid Sterba return -EINVAL; 213f37c563bSDavid Sterba 214f37c563bSDavid Sterba /* NOCOW and compression options are mutually exclusive */ 215f37c563bSDavid Sterba if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 216f37c563bSDavid Sterba return -EINVAL; 217f37c563bSDavid Sterba if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 218f37c563bSDavid Sterba return -EINVAL; 219f37c563bSDavid Sterba 22075e7cb7fSLiu Bo return 0; 22175e7cb7fSLiu Bo } 22275e7cb7fSLiu Bo 223d206e9c9SNaohiro Aota static int check_fsflags_compatible(struct btrfs_fs_info *fs_info, 224d206e9c9SNaohiro Aota unsigned int flags) 225d206e9c9SNaohiro Aota { 226d206e9c9SNaohiro Aota if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL)) 227d206e9c9SNaohiro Aota return -EPERM; 228d206e9c9SNaohiro Aota 229d206e9c9SNaohiro Aota return 0; 230d206e9c9SNaohiro Aota } 231d206e9c9SNaohiro Aota 23297fc2977SMiklos Szeredi /* 23397fc2977SMiklos Szeredi * Set flags/xflags from the internal inode flags. The remaining items of 23497fc2977SMiklos Szeredi * fsxattr are zeroed. 23597fc2977SMiklos Szeredi */ 23697fc2977SMiklos Szeredi int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa) 2376cbff00fSChristoph Hellwig { 23897fc2977SMiklos Szeredi struct btrfs_inode *binode = BTRFS_I(d_inode(dentry)); 23997fc2977SMiklos Szeredi 24077eea05eSBoris Burkov fileattr_fill_flags(fa, btrfs_inode_flags_to_fsflags(binode)); 24197fc2977SMiklos Szeredi return 0; 24297fc2977SMiklos Szeredi } 24397fc2977SMiklos Szeredi 24497fc2977SMiklos Szeredi int btrfs_fileattr_set(struct user_namespace *mnt_userns, 24597fc2977SMiklos Szeredi struct dentry *dentry, struct fileattr *fa) 24697fc2977SMiklos Szeredi { 24797fc2977SMiklos Szeredi struct inode *inode = d_inode(dentry); 2480b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 2495c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 2505c57b8b6SDavid Sterba struct btrfs_root *root = binode->root; 2516cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 2525aca2842SDarrick J. Wong unsigned int fsflags, old_fsflags; 2536cbff00fSChristoph Hellwig int ret; 254ff9fef55SAnand Jain const char *comp = NULL; 255f37c563bSDavid Sterba u32 binode_flags; 2566cbff00fSChristoph Hellwig 257b83cc969SLi Zefan if (btrfs_root_readonly(root)) 258b83cc969SLi Zefan return -EROFS; 259b83cc969SLi Zefan 26097fc2977SMiklos Szeredi if (fileattr_has_fsx(fa)) 26197fc2977SMiklos Szeredi return -EOPNOTSUPP; 2626cbff00fSChristoph Hellwig 26397fc2977SMiklos Szeredi fsflags = btrfs_mask_fsflags_for_type(inode, fa->flags); 26477eea05eSBoris Burkov old_fsflags = btrfs_inode_flags_to_fsflags(binode); 26597fc2977SMiklos Szeredi ret = check_fsflags(old_fsflags, fsflags); 266e7848683SJan Kara if (ret) 267e7848683SJan Kara return ret; 268e7848683SJan Kara 269d206e9c9SNaohiro Aota ret = check_fsflags_compatible(fs_info, fsflags); 270d206e9c9SNaohiro Aota if (ret) 27197fc2977SMiklos Szeredi return ret; 272d206e9c9SNaohiro Aota 273f37c563bSDavid Sterba binode_flags = binode->flags; 2745c57b8b6SDavid Sterba if (fsflags & FS_SYNC_FL) 275d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_SYNC; 2766cbff00fSChristoph Hellwig else 277d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_SYNC; 2785c57b8b6SDavid Sterba if (fsflags & FS_IMMUTABLE_FL) 279d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_IMMUTABLE; 2806cbff00fSChristoph Hellwig else 281d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_IMMUTABLE; 2825c57b8b6SDavid Sterba if (fsflags & FS_APPEND_FL) 283d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_APPEND; 2846cbff00fSChristoph Hellwig else 285d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_APPEND; 2865c57b8b6SDavid Sterba if (fsflags & FS_NODUMP_FL) 287d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODUMP; 2886cbff00fSChristoph Hellwig else 289d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODUMP; 2905c57b8b6SDavid Sterba if (fsflags & FS_NOATIME_FL) 291d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOATIME; 2926cbff00fSChristoph Hellwig else 293d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOATIME; 29497fc2977SMiklos Szeredi 29597fc2977SMiklos Szeredi /* If coming from FS_IOC_FSSETXATTR then skip unconverted flags */ 29697fc2977SMiklos Szeredi if (!fa->flags_valid) { 29797fc2977SMiklos Szeredi /* 1 item for the inode */ 29897fc2977SMiklos Szeredi trans = btrfs_start_transaction(root, 1); 2999b8a233bSRitesh Harjani if (IS_ERR(trans)) 3009b8a233bSRitesh Harjani return PTR_ERR(trans); 30197fc2977SMiklos Szeredi goto update_flags; 30297fc2977SMiklos Szeredi } 30397fc2977SMiklos Szeredi 3045c57b8b6SDavid Sterba if (fsflags & FS_DIRSYNC_FL) 305d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_DIRSYNC; 3066cbff00fSChristoph Hellwig else 307d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_DIRSYNC; 3085c57b8b6SDavid Sterba if (fsflags & FS_NOCOW_FL) { 30944e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 3107e97b8daSDavid Sterba /* 3117e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 3127e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 3137e97b8daSDavid Sterba * status of the file and will not set it. 3147e97b8daSDavid Sterba */ 3157e97b8daSDavid Sterba if (inode->i_size == 0) 316d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW | 317d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM; 3187e97b8daSDavid Sterba } else { 319d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW; 3207e97b8daSDavid Sterba } 3217e97b8daSDavid Sterba } else { 3227e97b8daSDavid Sterba /* 32301327610SNicholas D Steeves * Revert back under same assumptions as above 3247e97b8daSDavid Sterba */ 32544e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 3267e97b8daSDavid Sterba if (inode->i_size == 0) 327d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_NODATACOW | 328d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM); 3297e97b8daSDavid Sterba } else { 330d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODATACOW; 3317e97b8daSDavid Sterba } 3327e97b8daSDavid Sterba } 3336cbff00fSChristoph Hellwig 33475e7cb7fSLiu Bo /* 33575e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 33675e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 33775e7cb7fSLiu Bo * things smaller. 33875e7cb7fSLiu Bo */ 3395c57b8b6SDavid Sterba if (fsflags & FS_NOCOMP_FL) { 340d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_COMPRESS; 341d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOCOMPRESS; 3425c57b8b6SDavid Sterba } else if (fsflags & FS_COMPR_FL) { 34363541927SFilipe David Borba Manana 34497fc2977SMiklos Szeredi if (IS_SWAPFILE(inode)) 34597fc2977SMiklos Szeredi return -ETXTBSY; 346eede2bf3SOmar Sandoval 347d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_COMPRESS; 348d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOCOMPRESS; 34963541927SFilipe David Borba Manana 35093370509SDavid Sterba comp = btrfs_compress_type2str(fs_info->compress_type); 35193370509SDavid Sterba if (!comp || comp[0] == 0) 35293370509SDavid Sterba comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB); 353ebcb904dSLi Zefan } else { 354d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 35575e7cb7fSLiu Bo } 3566cbff00fSChristoph Hellwig 357ff9fef55SAnand Jain /* 358ff9fef55SAnand Jain * 1 for inode item 359ff9fef55SAnand Jain * 2 for properties 360ff9fef55SAnand Jain */ 361ff9fef55SAnand Jain trans = btrfs_start_transaction(root, 3); 36297fc2977SMiklos Szeredi if (IS_ERR(trans)) 36397fc2977SMiklos Szeredi return PTR_ERR(trans); 3646cbff00fSChristoph Hellwig 365ff9fef55SAnand Jain if (comp) { 366ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp, 367ff9fef55SAnand Jain strlen(comp), 0); 368ff9fef55SAnand Jain if (ret) { 369ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 370ff9fef55SAnand Jain goto out_end_trans; 371ff9fef55SAnand Jain } 372ff9fef55SAnand Jain } else { 373ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL, 374ff9fef55SAnand Jain 0, 0); 375ff9fef55SAnand Jain if (ret && ret != -ENODATA) { 376ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 377ff9fef55SAnand Jain goto out_end_trans; 378ff9fef55SAnand Jain } 379ff9fef55SAnand Jain } 380ff9fef55SAnand Jain 38197fc2977SMiklos Szeredi update_flags: 382d2b8fcfeSAnand Jain binode->flags = binode_flags; 3837b6a221eSDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 3840c4d2d95SJosef Bacik inode_inc_iversion(inode); 385c2050a45SDeepa Dinamani inode->i_ctime = current_time(inode); 3869a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); 3876cbff00fSChristoph Hellwig 388ff9fef55SAnand Jain out_end_trans: 3893a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3902d4e6f6aSliubo return ret; 3916cbff00fSChristoph Hellwig } 3926cbff00fSChristoph Hellwig 3930d7ed32cSDavid Sterba /* 3940d7ed32cSDavid Sterba * Start exclusive operation @type, return true on success 3950d7ed32cSDavid Sterba */ 396c3e1f96cSGoldwyn Rodrigues bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, 397c3e1f96cSGoldwyn Rodrigues enum btrfs_exclusive_operation type) 398c3e1f96cSGoldwyn Rodrigues { 3990d7ed32cSDavid Sterba bool ret = false; 4000d7ed32cSDavid Sterba 4010d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 4020d7ed32cSDavid Sterba if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) { 4030d7ed32cSDavid Sterba fs_info->exclusive_operation = type; 4040d7ed32cSDavid Sterba ret = true; 4050d7ed32cSDavid Sterba } 4060d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 4070d7ed32cSDavid Sterba 4080d7ed32cSDavid Sterba return ret; 409c3e1f96cSGoldwyn Rodrigues } 410c3e1f96cSGoldwyn Rodrigues 411578bda9eSDavid Sterba /* 412578bda9eSDavid Sterba * Conditionally allow to enter the exclusive operation in case it's compatible 413578bda9eSDavid Sterba * with the running one. This must be paired with btrfs_exclop_start_unlock and 414578bda9eSDavid Sterba * btrfs_exclop_finish. 415578bda9eSDavid Sterba * 416578bda9eSDavid Sterba * Compatibility: 417578bda9eSDavid Sterba * - the same type is already running 418621a1ee1SNikolay Borisov * - when trying to add a device and balance has been paused 419578bda9eSDavid Sterba * - not BTRFS_EXCLOP_NONE - this is intentionally incompatible and the caller 420578bda9eSDavid Sterba * must check the condition first that would allow none -> @type 421578bda9eSDavid Sterba */ 422578bda9eSDavid Sterba bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info, 423578bda9eSDavid Sterba enum btrfs_exclusive_operation type) 424578bda9eSDavid Sterba { 425578bda9eSDavid Sterba spin_lock(&fs_info->super_lock); 426621a1ee1SNikolay Borisov if (fs_info->exclusive_operation == type || 427621a1ee1SNikolay Borisov (fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED && 428621a1ee1SNikolay Borisov type == BTRFS_EXCLOP_DEV_ADD)) 429578bda9eSDavid Sterba return true; 430578bda9eSDavid Sterba 431578bda9eSDavid Sterba spin_unlock(&fs_info->super_lock); 432578bda9eSDavid Sterba return false; 433578bda9eSDavid Sterba } 434578bda9eSDavid Sterba 435578bda9eSDavid Sterba void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info) 436578bda9eSDavid Sterba { 437578bda9eSDavid Sterba spin_unlock(&fs_info->super_lock); 438578bda9eSDavid Sterba } 439578bda9eSDavid Sterba 440c3e1f96cSGoldwyn Rodrigues void btrfs_exclop_finish(struct btrfs_fs_info *fs_info) 441c3e1f96cSGoldwyn Rodrigues { 4420d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 443c3e1f96cSGoldwyn Rodrigues WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE); 4440d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 44566a2823cSGoldwyn Rodrigues sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation"); 446c3e1f96cSGoldwyn Rodrigues } 447c3e1f96cSGoldwyn Rodrigues 448efc0e69cSNikolay Borisov void btrfs_exclop_balance(struct btrfs_fs_info *fs_info, 449efc0e69cSNikolay Borisov enum btrfs_exclusive_operation op) 450efc0e69cSNikolay Borisov { 451efc0e69cSNikolay Borisov switch (op) { 452efc0e69cSNikolay Borisov case BTRFS_EXCLOP_BALANCE_PAUSED: 453efc0e69cSNikolay Borisov spin_lock(&fs_info->super_lock); 454efc0e69cSNikolay Borisov ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE || 455efc0e69cSNikolay Borisov fs_info->exclusive_operation == BTRFS_EXCLOP_DEV_ADD); 456efc0e69cSNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE_PAUSED; 457efc0e69cSNikolay Borisov spin_unlock(&fs_info->super_lock); 458efc0e69cSNikolay Borisov break; 459efc0e69cSNikolay Borisov case BTRFS_EXCLOP_BALANCE: 460efc0e69cSNikolay Borisov spin_lock(&fs_info->super_lock); 461efc0e69cSNikolay Borisov ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED); 462efc0e69cSNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE; 463efc0e69cSNikolay Borisov spin_unlock(&fs_info->super_lock); 464efc0e69cSNikolay Borisov break; 465efc0e69cSNikolay Borisov default: 466efc0e69cSNikolay Borisov btrfs_warn(fs_info, 467efc0e69cSNikolay Borisov "invalid exclop balance operation %d requested", op); 468efc0e69cSNikolay Borisov } 469efc0e69cSNikolay Borisov } 470efc0e69cSNikolay Borisov 471dc408ccdSSahil Kang static int btrfs_ioctl_getversion(struct inode *inode, int __user *arg) 4726cbff00fSChristoph Hellwig { 4736cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 4746cbff00fSChristoph Hellwig } 475f46b5a66SChristoph Hellwig 476b929c1d8SMarcos Paulo de Souza static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, 477b929c1d8SMarcos Paulo de Souza void __user *arg) 478f7039b1dSLi Dongyang { 479f7039b1dSLi Dongyang struct btrfs_device *device; 480f7039b1dSLi Dongyang struct fstrim_range range; 481f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 482f7039b1dSLi Dongyang u64 num_devices = 0; 483f7039b1dSLi Dongyang int ret; 484f7039b1dSLi Dongyang 485f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 486f7039b1dSLi Dongyang return -EPERM; 487f7039b1dSLi Dongyang 488f35f06c3SFilipe Manana /* 4891cb3dc3fSNaohiro Aota * btrfs_trim_block_group() depends on space cache, which is not 4901cb3dc3fSNaohiro Aota * available in zoned filesystem. So, disallow fitrim on a zoned 4911cb3dc3fSNaohiro Aota * filesystem for now. 4921cb3dc3fSNaohiro Aota */ 4931cb3dc3fSNaohiro Aota if (btrfs_is_zoned(fs_info)) 4941cb3dc3fSNaohiro Aota return -EOPNOTSUPP; 4951cb3dc3fSNaohiro Aota 4961cb3dc3fSNaohiro Aota /* 497f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 498f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 499f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 500f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 501f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 502f35f06c3SFilipe Manana */ 503f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 504f35f06c3SFilipe Manana return -EROFS; 505f35f06c3SFilipe Manana 5061f78160cSXiao Guangrong rcu_read_lock(); 5071f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 5081f78160cSXiao Guangrong dev_list) { 5097b47ef52SChristoph Hellwig if (!device->bdev || !bdev_max_discard_sectors(device->bdev)) 510f7039b1dSLi Dongyang continue; 511f7039b1dSLi Dongyang num_devices++; 5127b47ef52SChristoph Hellwig minlen = min_t(u64, bdev_discard_granularity(device->bdev), 513f7039b1dSLi Dongyang minlen); 514f7039b1dSLi Dongyang } 5151f78160cSXiao Guangrong rcu_read_unlock(); 516f4c697e6SLukas Czerner 517f7039b1dSLi Dongyang if (!num_devices) 518f7039b1dSLi Dongyang return -EOPNOTSUPP; 519f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 520f7039b1dSLi Dongyang return -EFAULT; 5216ba9fc8eSQu Wenruo 5226ba9fc8eSQu Wenruo /* 5236ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 5246ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 5256ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 5266ba9fc8eSQu Wenruo */ 5276ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 528f4c697e6SLukas Czerner return -EINVAL; 529f7039b1dSLi Dongyang 530f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 5312ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 532f7039b1dSLi Dongyang if (ret < 0) 533f7039b1dSLi Dongyang return ret; 534f7039b1dSLi Dongyang 535f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 536f7039b1dSLi Dongyang return -EFAULT; 537f7039b1dSLi Dongyang 538f7039b1dSLi Dongyang return 0; 539f7039b1dSLi Dongyang } 540f7039b1dSLi Dongyang 541e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 542dd5f9615SStefan Behrens { 54346e0f66aSChris Mason int i; 54446e0f66aSChris Mason 54546e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 54646e0f66aSChris Mason if (uuid[i]) 54746e0f66aSChris Mason return 0; 54846e0f66aSChris Mason } 54946e0f66aSChris Mason return 1; 550dd5f9615SStefan Behrens } 551dd5f9615SStefan Behrens 5523538d68dSOmar Sandoval /* 5533538d68dSOmar Sandoval * Calculate the number of transaction items to reserve for creating a subvolume 5543538d68dSOmar Sandoval * or snapshot, not including the inode, directory entries, or parent directory. 5553538d68dSOmar Sandoval */ 5563538d68dSOmar Sandoval static unsigned int create_subvol_num_items(struct btrfs_qgroup_inherit *inherit) 5573538d68dSOmar Sandoval { 5583538d68dSOmar Sandoval /* 5593538d68dSOmar Sandoval * 1 to add root block 5603538d68dSOmar Sandoval * 1 to add root item 5613538d68dSOmar Sandoval * 1 to add root ref 5623538d68dSOmar Sandoval * 1 to add root backref 5633538d68dSOmar Sandoval * 1 to add UUID item 5643538d68dSOmar Sandoval * 1 to add qgroup info 5653538d68dSOmar Sandoval * 1 to add qgroup limit 5663538d68dSOmar Sandoval * 5673538d68dSOmar Sandoval * Ideally the last two would only be accounted if qgroups are enabled, 5683538d68dSOmar Sandoval * but that can change between now and the time we would insert them. 5693538d68dSOmar Sandoval */ 5703538d68dSOmar Sandoval unsigned int num_items = 7; 5713538d68dSOmar Sandoval 5723538d68dSOmar Sandoval if (inherit) { 5733538d68dSOmar Sandoval /* 2 to add qgroup relations for each inherited qgroup */ 5743538d68dSOmar Sandoval num_items += 2 * inherit->num_qgroups; 5753538d68dSOmar Sandoval } 5763538d68dSOmar Sandoval return num_items; 5773538d68dSOmar Sandoval } 5783538d68dSOmar Sandoval 5794d4340c9SChristian Brauner static noinline int create_subvol(struct user_namespace *mnt_userns, 5804d4340c9SChristian Brauner struct inode *dir, struct dentry *dentry, 5818696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 582f46b5a66SChristoph Hellwig { 5830b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 584f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 585f46b5a66SChristoph Hellwig struct btrfs_key key; 58649a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 587f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 588f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 589d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 59076dda93cSYan, Zheng struct btrfs_root *new_root; 591d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 59295582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 5933538d68dSOmar Sandoval struct btrfs_new_inode_args new_inode_args = { 5943538d68dSOmar Sandoval .dir = dir, 5953538d68dSOmar Sandoval .dentry = dentry, 5963538d68dSOmar Sandoval .subvol = true, 5973538d68dSOmar Sandoval }; 5983538d68dSOmar Sandoval unsigned int trans_num_items; 599f46b5a66SChristoph Hellwig int ret; 6002256e901SOmar Sandoval dev_t anon_dev; 601f46b5a66SChristoph Hellwig u64 objectid; 602f46b5a66SChristoph Hellwig 60349a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 60449a3c4d9SDavid Sterba if (!root_item) 60549a3c4d9SDavid Sterba return -ENOMEM; 60649a3c4d9SDavid Sterba 607543068a2SNikolay Borisov ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); 6082fbe8c8aSAl Viro if (ret) 6092256e901SOmar Sandoval goto out_root_item; 6102dfb1e43SQu Wenruo 611e09fe2d2SQu Wenruo /* 612e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 61301327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 614e09fe2d2SQu Wenruo */ 61549a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 61649a3c4d9SDavid Sterba ret = -ENOSPC; 6172256e901SOmar Sandoval goto out_root_item; 61849a3c4d9SDavid Sterba } 619e09fe2d2SQu Wenruo 6202256e901SOmar Sandoval ret = get_anon_bdev(&anon_dev); 6212256e901SOmar Sandoval if (ret < 0) 6222256e901SOmar Sandoval goto out_root_item; 6232256e901SOmar Sandoval 6243538d68dSOmar Sandoval new_inode_args.inode = btrfs_new_subvol_inode(mnt_userns, dir); 6253538d68dSOmar Sandoval if (!new_inode_args.inode) { 626a1fd0c35SOmar Sandoval ret = -ENOMEM; 627a1fd0c35SOmar Sandoval goto out_anon_dev; 628a1fd0c35SOmar Sandoval } 6293538d68dSOmar Sandoval ret = btrfs_new_inode_prepare(&new_inode_args, &trans_num_items); 630d5c12070SMiao Xie if (ret) 631a1fd0c35SOmar Sandoval goto out_inode; 6323538d68dSOmar Sandoval trans_num_items += create_subvol_num_items(inherit); 6333538d68dSOmar Sandoval 6343538d68dSOmar Sandoval btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 6353538d68dSOmar Sandoval ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 6363538d68dSOmar Sandoval trans_num_items, false); 6373538d68dSOmar Sandoval if (ret) 6383538d68dSOmar Sandoval goto out_new_inode_args; 639f46b5a66SChristoph Hellwig 640d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 641d5c12070SMiao Xie if (IS_ERR(trans)) { 642d5c12070SMiao Xie ret = PTR_ERR(trans); 643e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 6443538d68dSOmar Sandoval goto out_new_inode_args; 645d5c12070SMiao Xie } 646d5c12070SMiao Xie trans->block_rsv = &block_rsv; 647d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 648f46b5a66SChristoph Hellwig 649a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 6506f72c7e2SArne Jansen if (ret) 6512256e901SOmar Sandoval goto out; 6526f72c7e2SArne Jansen 6539631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 6549631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 6558e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 6568e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 6572256e901SOmar Sandoval goto out; 6588e8a1e31SJosef Bacik } 659f46b5a66SChristoph Hellwig 660f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 661f46b5a66SChristoph Hellwig 66249a3c4d9SDavid Sterba inode_item = &root_item->inode; 6633cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6643cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6653cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 666da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6670b246afaSJeff Mahoney fs_info->nodesize); 6683cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 669f46b5a66SChristoph Hellwig 67049a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 67149a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6723cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 67308fe4db1SLi Zefan 67449a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 67549a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 67649a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 67749a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 67849a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 67949a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 680f46b5a66SChristoph Hellwig 68149a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 68249a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 683807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 68449a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 68549a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 68649a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 68749a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 68849a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 689f46b5a66SChristoph Hellwig 690925baeddSChris Mason btrfs_tree_unlock(leaf); 691f46b5a66SChristoph Hellwig 69269948022SNikolay Borisov btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); 693f46b5a66SChristoph Hellwig 694f46b5a66SChristoph Hellwig key.objectid = objectid; 6955d4f98a2SYan Zheng key.offset = 0; 696962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 6970b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 69849a3c4d9SDavid Sterba root_item); 69967addf29SFilipe Manana if (ret) { 70067addf29SFilipe Manana /* 70167addf29SFilipe Manana * Since we don't abort the transaction in this case, free the 70267addf29SFilipe Manana * tree block so that we don't leak space and leave the 70367addf29SFilipe Manana * filesystem in an inconsistent state (an extent item in the 7047a163608SFilipe Manana * extent tree with a backreference for a root that does not 705212a58fdSFilipe Manana * exists). 70667addf29SFilipe Manana */ 707212a58fdSFilipe Manana btrfs_tree_lock(leaf); 708212a58fdSFilipe Manana btrfs_clean_tree_block(leaf); 709212a58fdSFilipe Manana btrfs_tree_unlock(leaf); 7107a163608SFilipe Manana btrfs_free_tree_block(trans, objectid, leaf, 0, 1); 71167addf29SFilipe Manana free_extent_buffer(leaf); 7122256e901SOmar Sandoval goto out; 71367addf29SFilipe Manana } 71467addf29SFilipe Manana 71567addf29SFilipe Manana free_extent_buffer(leaf); 71667addf29SFilipe Manana leaf = NULL; 717f46b5a66SChristoph Hellwig 7182dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 71979787eaaSJeff Mahoney if (IS_ERR(new_root)) { 72079787eaaSJeff Mahoney ret = PTR_ERR(new_root); 72166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 7222256e901SOmar Sandoval goto out; 72379787eaaSJeff Mahoney } 7242256e901SOmar Sandoval /* anon_dev is owned by new_root now. */ 7252dfb1e43SQu Wenruo anon_dev = 0; 7263538d68dSOmar Sandoval BTRFS_I(new_inode_args.inode)->root = new_root; 7273538d68dSOmar Sandoval /* ... and new_root is owned by new_inode_args.inode now. */ 72876dda93cSYan, Zheng 729221581e4SJosef Bacik ret = btrfs_record_root_in_trans(trans, new_root); 730221581e4SJosef Bacik if (ret) { 731221581e4SJosef Bacik btrfs_abort_transaction(trans, ret); 7322256e901SOmar Sandoval goto out; 733c7e54b51SJosef Bacik } 7340660b5afSChris Mason 735cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7366bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 737caae78e0SOmar Sandoval if (ret) { 73866642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 739caae78e0SOmar Sandoval goto out; 740caae78e0SOmar Sandoval } 741dd5f9615SStefan Behrens 742caae78e0SOmar Sandoval ret = btrfs_create_new_inode(trans, &new_inode_args); 743caae78e0SOmar Sandoval if (ret) { 744caae78e0SOmar Sandoval btrfs_abort_transaction(trans, ret); 745caae78e0SOmar Sandoval goto out; 746caae78e0SOmar Sandoval } 747caae78e0SOmar Sandoval 748caae78e0SOmar Sandoval d_instantiate_new(dentry, new_inode_args.inode); 749caae78e0SOmar Sandoval new_inode_args.inode = NULL; 750f46b5a66SChristoph Hellwig 7512256e901SOmar Sandoval out: 752d5c12070SMiao Xie trans->block_rsv = NULL; 753d5c12070SMiao Xie trans->bytes_reserved = 0; 754e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 755de6e8200SLiu Bo 7561b58ae0eSFilipe Manana if (ret) 7571b58ae0eSFilipe Manana btrfs_end_transaction(trans); 7581b58ae0eSFilipe Manana else 7591b58ae0eSFilipe Manana ret = btrfs_commit_transaction(trans); 7603538d68dSOmar Sandoval out_new_inode_args: 7613538d68dSOmar Sandoval btrfs_new_inode_args_destroy(&new_inode_args); 762a1fd0c35SOmar Sandoval out_inode: 7633538d68dSOmar Sandoval iput(new_inode_args.inode); 7642256e901SOmar Sandoval out_anon_dev: 7652dfb1e43SQu Wenruo if (anon_dev) 7662dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 7672256e901SOmar Sandoval out_root_item: 76849a3c4d9SDavid Sterba kfree(root_item); 76949a3c4d9SDavid Sterba return ret; 770f46b5a66SChristoph Hellwig } 771f46b5a66SChristoph Hellwig 772e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7739babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 774e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 775f46b5a66SChristoph Hellwig { 7760b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7772e4bfab9SYan, Zheng struct inode *inode; 778f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 7793538d68dSOmar Sandoval unsigned int trans_num_items; 780f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7812e4bfab9SYan, Zheng int ret; 782f46b5a66SChristoph Hellwig 783813febdbSJosef Bacik /* We do not support snapshotting right now. */ 784813febdbSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 785813febdbSJosef Bacik btrfs_warn(fs_info, 786813febdbSJosef Bacik "extent tree v2 doesn't support snapshotting yet"); 787813febdbSJosef Bacik return -EOPNOTSUPP; 788813febdbSJosef Bacik } 789813febdbSJosef Bacik 79092a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 791f46b5a66SChristoph Hellwig return -EINVAL; 792f46b5a66SChristoph Hellwig 793eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 794eede2bf3SOmar Sandoval btrfs_warn(fs_info, 795eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 796eede2bf3SOmar Sandoval return -ETXTBSY; 797eede2bf3SOmar Sandoval } 798eede2bf3SOmar Sandoval 79923269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 800a1ee7362SDavid Sterba if (!pending_snapshot) 801a1ee7362SDavid Sterba return -ENOMEM; 802a1ee7362SDavid Sterba 8032dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 8042dfb1e43SQu Wenruo if (ret < 0) 8052dfb1e43SQu Wenruo goto free_pending; 806b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 80723269bf5SDavid Sterba GFP_KERNEL); 8088546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 8098546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 810b0c0ea63SDavid Sterba ret = -ENOMEM; 811b0c0ea63SDavid Sterba goto free_pending; 812b0c0ea63SDavid Sterba } 813b0c0ea63SDavid Sterba 81466d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 81566d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 816d5c12070SMiao Xie /* 8173538d68dSOmar Sandoval * 1 to add dir item 8183538d68dSOmar Sandoval * 1 to add dir index 8193538d68dSOmar Sandoval * 1 to update parent inode item 820d5c12070SMiao Xie */ 8213538d68dSOmar Sandoval trans_num_items = create_subvol_num_items(inherit) + 3; 822d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 8233538d68dSOmar Sandoval &pending_snapshot->block_rsv, 8243538d68dSOmar Sandoval trans_num_items, false); 825d5c12070SMiao Xie if (ret) 826c11fbb6eSRobbie Ko goto free_pending; 827d5c12070SMiao Xie 828a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 829a22285a6SYan, Zheng pending_snapshot->root = root; 830b83cc969SLi Zefan pending_snapshot->readonly = readonly; 831e9662f70SMiao Xie pending_snapshot->dir = dir; 8328696c533SMiao Xie pending_snapshot->inherit = inherit; 833a22285a6SYan, Zheng 834d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 835a22285a6SYan, Zheng if (IS_ERR(trans)) { 836a22285a6SYan, Zheng ret = PTR_ERR(trans); 837a22285a6SYan, Zheng goto fail; 838a22285a6SYan, Zheng } 839a22285a6SYan, Zheng 84028b21c55SFilipe Manana trans->pending_snapshot = pending_snapshot; 8419babda9fSNikolay Borisov 8423a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 843aec8030aSMiao Xie if (ret) 844c37b2b62SJosef Bacik goto fail; 845a22285a6SYan, Zheng 846a22285a6SYan, Zheng ret = pending_snapshot->error; 847f46b5a66SChristoph Hellwig if (ret) 8482e4bfab9SYan, Zheng goto fail; 849f46b5a66SChristoph Hellwig 850d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 851d3797308SChris Mason if (ret) 852d3797308SChris Mason goto fail; 853d3797308SChris Mason 8542b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8552e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8562e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8572e4bfab9SYan, Zheng goto fail; 8582e4bfab9SYan, Zheng } 8595662344bSTsutomu Itoh 8602e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8612e4bfab9SYan, Zheng ret = 0; 8622dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8632e4bfab9SYan, Zheng fail: 8642dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 8652dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8662dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 86700246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 868e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 869b0c0ea63SDavid Sterba free_pending: 8702dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8712dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 872b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8738546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 874a1ee7362SDavid Sterba kfree(pending_snapshot); 875a1ee7362SDavid Sterba 876f46b5a66SChristoph Hellwig return ret; 877f46b5a66SChristoph Hellwig } 878f46b5a66SChristoph Hellwig 8794260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8804260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8814260f7c7SSage Weil * whether the type of victim is right. 8824260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8834260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8844260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8854260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8864260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8874260f7c7SSage Weil * a. be owner of dir, or 8884260f7c7SSage Weil * b. be owner of victim, or 8894260f7c7SSage Weil * c. have CAP_FOWNER capability 89001327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 8914260f7c7SSage Weil * links pointing to it. 8924260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8934260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 8944260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 8954260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 8964260f7c7SSage Weil * nfs_async_unlink(). 8974260f7c7SSage Weil */ 8984260f7c7SSage Weil 899c4ed533bSChristian Brauner static int btrfs_may_delete(struct user_namespace *mnt_userns, 900c4ed533bSChristian Brauner struct inode *dir, struct dentry *victim, int isdir) 9014260f7c7SSage Weil { 9024260f7c7SSage Weil int error; 9034260f7c7SSage Weil 9042b0143b5SDavid Howells if (d_really_is_negative(victim)) 9054260f7c7SSage Weil return -ENOENT; 9064260f7c7SSage Weil 9072b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 9084fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 9094260f7c7SSage Weil 910c4ed533bSChristian Brauner error = inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); 9114260f7c7SSage Weil if (error) 9124260f7c7SSage Weil return error; 9134260f7c7SSage Weil if (IS_APPEND(dir)) 9144260f7c7SSage Weil return -EPERM; 915c4ed533bSChristian Brauner if (check_sticky(mnt_userns, dir, d_inode(victim)) || 916ba73d987SChristian Brauner IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) || 917ba73d987SChristian Brauner IS_SWAPFILE(d_inode(victim))) 9184260f7c7SSage Weil return -EPERM; 9194260f7c7SSage Weil if (isdir) { 920e36cb0b8SDavid Howells if (!d_is_dir(victim)) 9214260f7c7SSage Weil return -ENOTDIR; 9224260f7c7SSage Weil if (IS_ROOT(victim)) 9234260f7c7SSage Weil return -EBUSY; 924e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 9254260f7c7SSage Weil return -EISDIR; 9264260f7c7SSage Weil if (IS_DEADDIR(dir)) 9274260f7c7SSage Weil return -ENOENT; 9284260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 9294260f7c7SSage Weil return -EBUSY; 9304260f7c7SSage Weil return 0; 9314260f7c7SSage Weil } 9324260f7c7SSage Weil 933cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 9344d4340c9SChristian Brauner static inline int btrfs_may_create(struct user_namespace *mnt_userns, 9354d4340c9SChristian Brauner struct inode *dir, struct dentry *child) 936cb8e7090SChristoph Hellwig { 9372b0143b5SDavid Howells if (d_really_is_positive(child)) 938cb8e7090SChristoph Hellwig return -EEXIST; 939cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 940cb8e7090SChristoph Hellwig return -ENOENT; 9414d4340c9SChristian Brauner if (!fsuidgid_has_mapping(dir->i_sb, mnt_userns)) 9425474bf40SChristian Brauner return -EOVERFLOW; 9434d4340c9SChristian Brauner return inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); 944cb8e7090SChristoph Hellwig } 945cb8e7090SChristoph Hellwig 946cb8e7090SChristoph Hellwig /* 947cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 948cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 949cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 950cb8e7090SChristoph Hellwig */ 95192872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 9524d4340c9SChristian Brauner struct user_namespace *mnt_userns, 95352f75f4fSDavid Sterba const char *name, int namelen, 95472fd032eSSage Weil struct btrfs_root *snap_src, 9559babda9fSNikolay Borisov bool readonly, 9568696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 957cb8e7090SChristoph Hellwig { 9582b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9590b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 960cb8e7090SChristoph Hellwig struct dentry *dentry; 9616db75318SSweet Tea Dorminy struct fscrypt_str name_str = FSTR_INIT((char *)name, namelen); 962cb8e7090SChristoph Hellwig int error; 963cb8e7090SChristoph Hellwig 96400235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 96500235411SAl Viro if (error == -EINTR) 96600235411SAl Viro return error; 967cb8e7090SChristoph Hellwig 9684d4340c9SChristian Brauner dentry = lookup_one(mnt_userns, name, parent->dentry, namelen); 969cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 970cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 971cb8e7090SChristoph Hellwig goto out_unlock; 972cb8e7090SChristoph Hellwig 9734d4340c9SChristian Brauner error = btrfs_may_create(mnt_userns, dir, dentry); 974cb8e7090SChristoph Hellwig if (error) 975a874a63eSLiu Bo goto out_dput; 976cb8e7090SChristoph Hellwig 9779c52057cSChris Mason /* 9789c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9799c52057cSChris Mason * check for them now when we can safely fail 9809c52057cSChris Mason */ 9819c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 982e43eec81SSweet Tea Dorminy dir->i_ino, &name_str); 9839c52057cSChris Mason if (error) 9849c52057cSChris Mason goto out_dput; 9859c52057cSChris Mason 9860b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 98776dda93cSYan, Zheng 98876dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 98976dda93cSYan, Zheng goto out_up_read; 99076dda93cSYan, Zheng 9919babda9fSNikolay Borisov if (snap_src) 9929babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 9939babda9fSNikolay Borisov else 99470dc55f4SOmar Sandoval error = create_subvol(mnt_userns, dir, dentry, inherit); 9959babda9fSNikolay Borisov 99676dda93cSYan, Zheng if (!error) 99776dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 99876dda93cSYan, Zheng out_up_read: 9990b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 1000cb8e7090SChristoph Hellwig out_dput: 1001cb8e7090SChristoph Hellwig dput(dentry); 1002cb8e7090SChristoph Hellwig out_unlock: 100364708539SJosef Bacik btrfs_inode_unlock(dir, 0); 1004cb8e7090SChristoph Hellwig return error; 1005cb8e7090SChristoph Hellwig } 1006cb8e7090SChristoph Hellwig 1007c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 10084d4340c9SChristian Brauner struct user_namespace *mnt_userns, 1009c11fbb6eSRobbie Ko const char *name, int namelen, 1010c11fbb6eSRobbie Ko struct btrfs_root *root, 1011c11fbb6eSRobbie Ko bool readonly, 1012c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 1013c11fbb6eSRobbie Ko { 1014c11fbb6eSRobbie Ko int ret; 1015c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 1016c11fbb6eSRobbie Ko 1017c11fbb6eSRobbie Ko /* 1018c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 1019c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 1020c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 1021c11fbb6eSRobbie Ko */ 1022c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 1023c11fbb6eSRobbie Ko 1024f9baa501SFilipe Manana ret = btrfs_start_delalloc_snapshot(root, false); 1025c11fbb6eSRobbie Ko if (ret) 1026c11fbb6eSRobbie Ko goto out; 1027c11fbb6eSRobbie Ko 1028c11fbb6eSRobbie Ko /* 1029c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 1030c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 1031c11fbb6eSRobbie Ko * creation. 1032c11fbb6eSRobbie Ko */ 1033c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 1034c11fbb6eSRobbie Ko snapshot_force_cow = true; 1035c11fbb6eSRobbie Ko 1036c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 1037c11fbb6eSRobbie Ko 10384d4340c9SChristian Brauner ret = btrfs_mksubvol(parent, mnt_userns, name, namelen, 1039c11fbb6eSRobbie Ko root, readonly, inherit); 1040c11fbb6eSRobbie Ko out: 1041c11fbb6eSRobbie Ko if (snapshot_force_cow) 1042c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 1043c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 1044c11fbb6eSRobbie Ko return ret; 1045c11fbb6eSRobbie Ko } 1046c11fbb6eSRobbie Ko 1047d5633b0dSQu Wenruo /* 104817aaa434SDavid Sterba * Try to start exclusive operation @type or cancel it if it's running. 104917aaa434SDavid Sterba * 105017aaa434SDavid Sterba * Return: 105117aaa434SDavid Sterba * 0 - normal mode, newly claimed op started 105217aaa434SDavid Sterba * >0 - normal mode, something else is running, 105317aaa434SDavid Sterba * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space 105417aaa434SDavid Sterba * ECANCELED - cancel mode, successful cancel 105517aaa434SDavid Sterba * ENOTCONN - cancel mode, operation not running anymore 105617aaa434SDavid Sterba */ 105717aaa434SDavid Sterba static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info, 105817aaa434SDavid Sterba enum btrfs_exclusive_operation type, bool cancel) 105917aaa434SDavid Sterba { 106017aaa434SDavid Sterba if (!cancel) { 106117aaa434SDavid Sterba /* Start normal op */ 106217aaa434SDavid Sterba if (!btrfs_exclop_start(fs_info, type)) 106317aaa434SDavid Sterba return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 106417aaa434SDavid Sterba /* Exclusive operation is now claimed */ 106517aaa434SDavid Sterba return 0; 106617aaa434SDavid Sterba } 106717aaa434SDavid Sterba 106817aaa434SDavid Sterba /* Cancel running op */ 106917aaa434SDavid Sterba if (btrfs_exclop_start_try_lock(fs_info, type)) { 107017aaa434SDavid Sterba /* 107117aaa434SDavid Sterba * This blocks any exclop finish from setting it to NONE, so we 107217aaa434SDavid Sterba * request cancellation. Either it runs and we will wait for it, 107317aaa434SDavid Sterba * or it has finished and no waiting will happen. 107417aaa434SDavid Sterba */ 107517aaa434SDavid Sterba atomic_inc(&fs_info->reloc_cancel_req); 107617aaa434SDavid Sterba btrfs_exclop_start_unlock(fs_info); 107717aaa434SDavid Sterba 107817aaa434SDavid Sterba if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags)) 107917aaa434SDavid Sterba wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING, 108017aaa434SDavid Sterba TASK_INTERRUPTIBLE); 108117aaa434SDavid Sterba 108217aaa434SDavid Sterba return -ECANCELED; 108317aaa434SDavid Sterba } 108417aaa434SDavid Sterba 108517aaa434SDavid Sterba /* Something else is running or none */ 108617aaa434SDavid Sterba return -ENOTCONN; 108717aaa434SDavid Sterba } 108817aaa434SDavid Sterba 1089198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 109076dda93cSYan, Zheng void __user *arg) 1091f46b5a66SChristoph Hellwig { 1092562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 10930b246afaSJeff Mahoney struct inode *inode = file_inode(file); 10940b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1095f46b5a66SChristoph Hellwig u64 new_size; 1096f46b5a66SChristoph Hellwig u64 old_size; 1097f46b5a66SChristoph Hellwig u64 devid = 1; 10980b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1099f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1100f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1101f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1102f46b5a66SChristoph Hellwig char *sizestr; 11039a40f122SGui Hecheng char *retptr; 1104f46b5a66SChristoph Hellwig char *devstr = NULL; 1105f46b5a66SChristoph Hellwig int ret = 0; 1106f46b5a66SChristoph Hellwig int mod = 0; 1107bb059a37SDavid Sterba bool cancel; 1108f46b5a66SChristoph Hellwig 1109e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1110e441d54dSChris Mason return -EPERM; 1111e441d54dSChris Mason 1112198605a8SMiao Xie ret = mnt_want_write_file(file); 1113198605a8SMiao Xie if (ret) 1114198605a8SMiao Xie return ret; 1115198605a8SMiao Xie 1116bb059a37SDavid Sterba /* 1117bb059a37SDavid Sterba * Read the arguments before checking exclusivity to be able to 1118bb059a37SDavid Sterba * distinguish regular resize and cancel 1119bb059a37SDavid Sterba */ 1120dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1121c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1122c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1123bb059a37SDavid Sterba goto out_drop; 1124c9e9f97bSIlya Dryomov } 11255516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1126f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1127bb059a37SDavid Sterba cancel = (strcmp("cancel", sizestr) == 0); 1128bb059a37SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel); 1129bb059a37SDavid Sterba if (ret) 1130bb059a37SDavid Sterba goto out_free; 1131bb059a37SDavid Sterba /* Exclusive operation is now claimed */ 1132bb059a37SDavid Sterba 1133f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1134f46b5a66SChristoph Hellwig if (devstr) { 1135f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1136f46b5a66SChristoph Hellwig *devstr = '\0'; 1137f46b5a66SChristoph Hellwig devstr = vol_args->name; 113858dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 113958dfae63SZhangZhen if (ret) 1140bb059a37SDavid Sterba goto out_finish; 1141dfd79829SMiao Xie if (!devid) { 1142dfd79829SMiao Xie ret = -EINVAL; 1143bb059a37SDavid Sterba goto out_finish; 1144dfd79829SMiao Xie } 11450b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1146f46b5a66SChristoph Hellwig } 1147dba60f3fSMiao Xie 1148562d7b15SJosef Bacik args.devid = devid; 1149562d7b15SJosef Bacik device = btrfs_find_device(fs_info->fs_devices, &args); 1150f46b5a66SChristoph Hellwig if (!device) { 11510b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1152c1c9ff7cSGeert Uytterhoeven devid); 1153dfd79829SMiao Xie ret = -ENODEV; 1154bb059a37SDavid Sterba goto out_finish; 1155f46b5a66SChristoph Hellwig } 1156dba60f3fSMiao Xie 1157ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 11580b246afaSJeff Mahoney btrfs_info(fs_info, 1159efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1160c1c9ff7cSGeert Uytterhoeven devid); 1161dfd79829SMiao Xie ret = -EPERM; 1162bb059a37SDavid Sterba goto out_finish; 11634e42ae1bSLiu Bo } 11644e42ae1bSLiu Bo 1165f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1166cda00ebaSChristoph Hellwig new_size = bdev_nr_bytes(device->bdev); 1167f46b5a66SChristoph Hellwig else { 1168f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1169f46b5a66SChristoph Hellwig mod = -1; 1170f46b5a66SChristoph Hellwig sizestr++; 1171f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1172f46b5a66SChristoph Hellwig mod = 1; 1173f46b5a66SChristoph Hellwig sizestr++; 1174f46b5a66SChristoph Hellwig } 11759a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 11769a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1177f46b5a66SChristoph Hellwig ret = -EINVAL; 1178bb059a37SDavid Sterba goto out_finish; 1179f46b5a66SChristoph Hellwig } 1180f46b5a66SChristoph Hellwig } 1181f46b5a66SChristoph Hellwig 1182401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1183dfd79829SMiao Xie ret = -EPERM; 1184bb059a37SDavid Sterba goto out_finish; 118563a212abSStefan Behrens } 118663a212abSStefan Behrens 11877cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1188f46b5a66SChristoph Hellwig 1189f46b5a66SChristoph Hellwig if (mod < 0) { 1190f46b5a66SChristoph Hellwig if (new_size > old_size) { 1191f46b5a66SChristoph Hellwig ret = -EINVAL; 1192bb059a37SDavid Sterba goto out_finish; 1193f46b5a66SChristoph Hellwig } 1194f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1195f46b5a66SChristoph Hellwig } else if (mod > 0) { 1196eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1197902c68a4SGui Hecheng ret = -ERANGE; 1198bb059a37SDavid Sterba goto out_finish; 1199eb8052e0SWenliang Fan } 1200f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1201f46b5a66SChristoph Hellwig } 1202f46b5a66SChristoph Hellwig 1203ee22184bSByongho Lee if (new_size < SZ_256M) { 1204f46b5a66SChristoph Hellwig ret = -EINVAL; 1205bb059a37SDavid Sterba goto out_finish; 1206f46b5a66SChristoph Hellwig } 1207cda00ebaSChristoph Hellwig if (new_size > bdev_nr_bytes(device->bdev)) { 1208f46b5a66SChristoph Hellwig ret = -EFBIG; 1209bb059a37SDavid Sterba goto out_finish; 1210f46b5a66SChristoph Hellwig } 1211f46b5a66SChristoph Hellwig 121247f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1213f46b5a66SChristoph Hellwig 1214f46b5a66SChristoph Hellwig if (new_size > old_size) { 1215a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 121698d5dc13STsutomu Itoh if (IS_ERR(trans)) { 121798d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1218bb059a37SDavid Sterba goto out_finish; 121998d5dc13STsutomu Itoh } 1220f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 12213a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1222ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1223f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 12240253f40eSjeff.liu } /* equal, nothing need to do */ 1225f46b5a66SChristoph Hellwig 1226faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1227faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1228faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1229faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 1230faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1231bb059a37SDavid Sterba out_finish: 1232bb059a37SDavid Sterba btrfs_exclop_finish(fs_info); 1233c9e9f97bSIlya Dryomov out_free: 1234f46b5a66SChristoph Hellwig kfree(vol_args); 1235bb059a37SDavid Sterba out_drop: 123618f39c41SIlya Dryomov mnt_drop_write_file(file); 1237f46b5a66SChristoph Hellwig return ret; 1238f46b5a66SChristoph Hellwig } 1239f46b5a66SChristoph Hellwig 12405d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 12414d4340c9SChristian Brauner struct user_namespace *mnt_userns, 124252f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 12435d54c67eSNikolay Borisov bool readonly, 12448696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1245f46b5a66SChristoph Hellwig { 1246f46b5a66SChristoph Hellwig int namelen; 12473de4586cSChris Mason int ret = 0; 1248f46b5a66SChristoph Hellwig 1249325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1250325c50e3SJeff Mahoney return -ENOTDIR; 1251325c50e3SJeff Mahoney 1252a874a63eSLiu Bo ret = mnt_want_write_file(file); 1253a874a63eSLiu Bo if (ret) 1254a874a63eSLiu Bo goto out; 1255a874a63eSLiu Bo 125672fd032eSSage Weil namelen = strlen(name); 125772fd032eSSage Weil if (strchr(name, '/')) { 1258f46b5a66SChristoph Hellwig ret = -EINVAL; 1259a874a63eSLiu Bo goto out_drop_write; 1260f46b5a66SChristoph Hellwig } 1261f46b5a66SChristoph Hellwig 126216780cabSChris Mason if (name[0] == '.' && 126316780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 126416780cabSChris Mason ret = -EEXIST; 1265a874a63eSLiu Bo goto out_drop_write; 126616780cabSChris Mason } 126716780cabSChris Mason 12683de4586cSChris Mason if (subvol) { 12694d4340c9SChristian Brauner ret = btrfs_mksubvol(&file->f_path, mnt_userns, name, 12704d4340c9SChristian Brauner namelen, NULL, readonly, inherit); 1271cb8e7090SChristoph Hellwig } else { 12722903ff01SAl Viro struct fd src = fdget(fd); 12733de4586cSChris Mason struct inode *src_inode; 12742903ff01SAl Viro if (!src.file) { 12753de4586cSChris Mason ret = -EINVAL; 1276a874a63eSLiu Bo goto out_drop_write; 12773de4586cSChris Mason } 12783de4586cSChris Mason 1279496ad9aaSAl Viro src_inode = file_inode(src.file); 1280496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1281c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1282efe120a0SFrank Holton "Snapshot src from another FS"); 128323ad5b17SKusanagi Kouichi ret = -EXDEV; 12844d4340c9SChristian Brauner } else if (!inode_owner_or_capable(mnt_userns, src_inode)) { 1285d0242061SDavid Sterba /* 1286d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1287d0242061SDavid Sterba * are limited to own subvolumes only 1288d0242061SDavid Sterba */ 1289d0242061SDavid Sterba ret = -EPERM; 1290ecd18815SAl Viro } else { 12914d4340c9SChristian Brauner ret = btrfs_mksnapshot(&file->f_path, mnt_userns, 12924d4340c9SChristian Brauner name, namelen, 129372fd032eSSage Weil BTRFS_I(src_inode)->root, 12945d54c67eSNikolay Borisov readonly, inherit); 1295ecd18815SAl Viro } 12962903ff01SAl Viro fdput(src); 1297cb8e7090SChristoph Hellwig } 1298a874a63eSLiu Bo out_drop_write: 1299a874a63eSLiu Bo mnt_drop_write_file(file); 1300f46b5a66SChristoph Hellwig out: 130172fd032eSSage Weil return ret; 130272fd032eSSage Weil } 130372fd032eSSage Weil 130472fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1305fa0d2b9bSLi Zefan void __user *arg, int subvol) 130672fd032eSSage Weil { 1307fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 130872fd032eSSage Weil int ret; 130972fd032eSSage Weil 1310325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1311325c50e3SJeff Mahoney return -ENOTDIR; 1312325c50e3SJeff Mahoney 1313fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1314fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1315fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1316fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1317fa0d2b9bSLi Zefan 13184d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 13194d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 13204d4340c9SChristian Brauner false, NULL); 1321fa0d2b9bSLi Zefan 1322fa0d2b9bSLi Zefan kfree(vol_args); 1323fa0d2b9bSLi Zefan return ret; 1324fa0d2b9bSLi Zefan } 1325fa0d2b9bSLi Zefan 1326fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1327fa0d2b9bSLi Zefan void __user *arg, int subvol) 1328fa0d2b9bSLi Zefan { 1329fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1330fa0d2b9bSLi Zefan int ret; 1331b83cc969SLi Zefan bool readonly = false; 13326f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 133372fd032eSSage Weil 1334325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1335325c50e3SJeff Mahoney return -ENOTDIR; 1336325c50e3SJeff Mahoney 1337fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1338fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1339fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1340fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1341fdfb1e4fSLi Zefan 1342673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 1343b83cc969SLi Zefan ret = -EOPNOTSUPP; 1344c47ca32dSDan Carpenter goto free_args; 1345fdfb1e4fSLi Zefan } 1346fdfb1e4fSLi Zefan 1347b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1348b83cc969SLi Zefan readonly = true; 13496f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 13505011c5a6SDan Carpenter u64 nums; 13515011c5a6SDan Carpenter 13525011c5a6SDan Carpenter if (vol_args->size < sizeof(*inherit) || 13535011c5a6SDan Carpenter vol_args->size > PAGE_SIZE) { 13546f72c7e2SArne Jansen ret = -EINVAL; 1355c47ca32dSDan Carpenter goto free_args; 13566f72c7e2SArne Jansen } 13576f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 13586f72c7e2SArne Jansen if (IS_ERR(inherit)) { 13596f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1360c47ca32dSDan Carpenter goto free_args; 13616f72c7e2SArne Jansen } 13625011c5a6SDan Carpenter 13635011c5a6SDan Carpenter if (inherit->num_qgroups > PAGE_SIZE || 13645011c5a6SDan Carpenter inherit->num_ref_copies > PAGE_SIZE || 13655011c5a6SDan Carpenter inherit->num_excl_copies > PAGE_SIZE) { 13665011c5a6SDan Carpenter ret = -EINVAL; 13675011c5a6SDan Carpenter goto free_inherit; 13685011c5a6SDan Carpenter } 13695011c5a6SDan Carpenter 13705011c5a6SDan Carpenter nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + 13715011c5a6SDan Carpenter 2 * inherit->num_excl_copies; 13725011c5a6SDan Carpenter if (vol_args->size != struct_size(inherit, qgroups, nums)) { 13735011c5a6SDan Carpenter ret = -EINVAL; 13745011c5a6SDan Carpenter goto free_inherit; 13755011c5a6SDan Carpenter } 13766f72c7e2SArne Jansen } 137775eaa0e2SSage Weil 13784d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 13794d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 13804d4340c9SChristian Brauner readonly, inherit); 1381c47ca32dSDan Carpenter if (ret) 1382c47ca32dSDan Carpenter goto free_inherit; 1383c47ca32dSDan Carpenter free_inherit: 13846f72c7e2SArne Jansen kfree(inherit); 1385c47ca32dSDan Carpenter free_args: 1386c47ca32dSDan Carpenter kfree(vol_args); 1387f46b5a66SChristoph Hellwig return ret; 1388f46b5a66SChristoph Hellwig } 1389f46b5a66SChristoph Hellwig 13909ad12305SSahil Kang static noinline int btrfs_ioctl_subvol_getflags(struct inode *inode, 13910caa102dSLi Zefan void __user *arg) 13920caa102dSLi Zefan { 13930b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 13940caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 13950caa102dSLi Zefan int ret = 0; 13960caa102dSLi Zefan u64 flags = 0; 13970caa102dSLi Zefan 13984a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 13990caa102dSLi Zefan return -EINVAL; 14000caa102dSLi Zefan 14010b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 14020caa102dSLi Zefan if (btrfs_root_readonly(root)) 14030caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 14040b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 14050caa102dSLi Zefan 14060caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 14070caa102dSLi Zefan ret = -EFAULT; 14080caa102dSLi Zefan 14090caa102dSLi Zefan return ret; 14100caa102dSLi Zefan } 14110caa102dSLi Zefan 14120caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 14130caa102dSLi Zefan void __user *arg) 14140caa102dSLi Zefan { 1415496ad9aaSAl Viro struct inode *inode = file_inode(file); 14160b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 14170caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 14180caa102dSLi Zefan struct btrfs_trans_handle *trans; 14190caa102dSLi Zefan u64 root_flags; 14200caa102dSLi Zefan u64 flags; 14210caa102dSLi Zefan int ret = 0; 14220caa102dSLi Zefan 142339e1674fSChristian Brauner if (!inode_owner_or_capable(file_mnt_user_ns(file), inode)) 1424bd60ea0fSDavid Sterba return -EPERM; 1425bd60ea0fSDavid Sterba 1426b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1427b9ca0664SLiu Bo if (ret) 1428b9ca0664SLiu Bo goto out; 14290caa102dSLi Zefan 14304a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 1431b9ca0664SLiu Bo ret = -EINVAL; 1432b9ca0664SLiu Bo goto out_drop_write; 1433b9ca0664SLiu Bo } 14340caa102dSLi Zefan 1435b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1436b9ca0664SLiu Bo ret = -EFAULT; 1437b9ca0664SLiu Bo goto out_drop_write; 1438b9ca0664SLiu Bo } 14390caa102dSLi Zefan 1440b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1441b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1442b9ca0664SLiu Bo goto out_drop_write; 1443b9ca0664SLiu Bo } 14440caa102dSLi Zefan 14450b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 14460caa102dSLi Zefan 14470caa102dSLi Zefan /* nothing to do */ 14480caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1449b9ca0664SLiu Bo goto out_drop_sem; 14500caa102dSLi Zefan 14510caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 14522c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 14530caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 14540caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 14552c686537SDavid Sterba } else { 14562c686537SDavid Sterba /* 14572c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 14582c686537SDavid Sterba * send 14592c686537SDavid Sterba */ 14602c686537SDavid Sterba spin_lock(&root->root_item_lock); 14612c686537SDavid Sterba if (root->send_in_progress == 0) { 14620caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 14630caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 14642c686537SDavid Sterba spin_unlock(&root->root_item_lock); 14652c686537SDavid Sterba } else { 14662c686537SDavid Sterba spin_unlock(&root->root_item_lock); 14670b246afaSJeff Mahoney btrfs_warn(fs_info, 14682c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 14692c686537SDavid Sterba root->root_key.objectid); 14702c686537SDavid Sterba ret = -EPERM; 14712c686537SDavid Sterba goto out_drop_sem; 14722c686537SDavid Sterba } 14732c686537SDavid Sterba } 14740caa102dSLi Zefan 14750caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 14760caa102dSLi Zefan if (IS_ERR(trans)) { 14770caa102dSLi Zefan ret = PTR_ERR(trans); 14780caa102dSLi Zefan goto out_reset; 14790caa102dSLi Zefan } 14800caa102dSLi Zefan 14810b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 14820caa102dSLi Zefan &root->root_key, &root->root_item); 14839417ebc8SNikolay Borisov if (ret < 0) { 14849417ebc8SNikolay Borisov btrfs_end_transaction(trans); 14859417ebc8SNikolay Borisov goto out_reset; 14869417ebc8SNikolay Borisov } 14870caa102dSLi Zefan 14889417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 14899417ebc8SNikolay Borisov 14900caa102dSLi Zefan out_reset: 14910caa102dSLi Zefan if (ret) 14920caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1493b9ca0664SLiu Bo out_drop_sem: 14940b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 1495b9ca0664SLiu Bo out_drop_write: 1496b9ca0664SLiu Bo mnt_drop_write_file(file); 1497b9ca0664SLiu Bo out: 14980caa102dSLi Zefan return ret; 14990caa102dSLi Zefan } 15000caa102dSLi Zefan 1501ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1502ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1503ac8e9819SChris Mason { 1504abc6e134SChris Mason struct btrfs_key test; 1505abc6e134SChris Mason int ret; 1506abc6e134SChris Mason 1507abc6e134SChris Mason test.objectid = sk->min_objectid; 1508abc6e134SChris Mason test.type = sk->min_type; 1509abc6e134SChris Mason test.offset = sk->min_offset; 1510abc6e134SChris Mason 1511abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1512abc6e134SChris Mason if (ret < 0) 1513ac8e9819SChris Mason return 0; 1514abc6e134SChris Mason 1515abc6e134SChris Mason test.objectid = sk->max_objectid; 1516abc6e134SChris Mason test.type = sk->max_type; 1517abc6e134SChris Mason test.offset = sk->max_offset; 1518abc6e134SChris Mason 1519abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1520abc6e134SChris Mason if (ret > 0) 1521ac8e9819SChris Mason return 0; 1522ac8e9819SChris Mason return 1; 1523ac8e9819SChris Mason } 1524ac8e9819SChris Mason 1525df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 1526ac8e9819SChris Mason struct btrfs_key *key, 1527ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 15289b6e817dSGerhard Heift size_t *buf_size, 1529ba346b35SGerhard Heift char __user *ubuf, 1530ac8e9819SChris Mason unsigned long *sk_offset, 1531ac8e9819SChris Mason int *num_found) 1532ac8e9819SChris Mason { 1533ac8e9819SChris Mason u64 found_transid; 1534ac8e9819SChris Mason struct extent_buffer *leaf; 1535ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1536dd81d459SNaohiro Aota struct btrfs_key test; 1537ac8e9819SChris Mason unsigned long item_off; 1538ac8e9819SChris Mason unsigned long item_len; 1539ac8e9819SChris Mason int nritems; 1540ac8e9819SChris Mason int i; 1541ac8e9819SChris Mason int slot; 1542ac8e9819SChris Mason int ret = 0; 1543ac8e9819SChris Mason 1544ac8e9819SChris Mason leaf = path->nodes[0]; 1545ac8e9819SChris Mason slot = path->slots[0]; 1546ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1547ac8e9819SChris Mason 1548ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1549ac8e9819SChris Mason i = nritems; 1550ac8e9819SChris Mason goto advance_key; 1551ac8e9819SChris Mason } 1552ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1553ac8e9819SChris Mason 1554ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1555ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 15563212fa14SJosef Bacik item_len = btrfs_item_size(leaf, i); 1557ac8e9819SChris Mason 155803b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 155903b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 156003b71c6cSGabriel de Perthuis continue; 156103b71c6cSGabriel de Perthuis 15629b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 15638f5f6178SGerhard Heift if (*num_found) { 1564ac8e9819SChris Mason ret = 1; 15658f5f6178SGerhard Heift goto out; 15668f5f6178SGerhard Heift } 15678f5f6178SGerhard Heift 15688f5f6178SGerhard Heift /* 15698f5f6178SGerhard Heift * return one empty item back for v1, which does not 15708f5f6178SGerhard Heift * handle -EOVERFLOW 15718f5f6178SGerhard Heift */ 15728f5f6178SGerhard Heift 15739b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 1574ac8e9819SChris Mason item_len = 0; 15758f5f6178SGerhard Heift ret = -EOVERFLOW; 15768f5f6178SGerhard Heift } 1577ac8e9819SChris Mason 15789b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 1579ac8e9819SChris Mason ret = 1; 158025c9bc2eSGerhard Heift goto out; 1581ac8e9819SChris Mason } 1582ac8e9819SChris Mason 1583ac8e9819SChris Mason sh.objectid = key->objectid; 1584ac8e9819SChris Mason sh.offset = key->offset; 1585ac8e9819SChris Mason sh.type = key->type; 1586ac8e9819SChris Mason sh.len = item_len; 1587ac8e9819SChris Mason sh.transid = found_transid; 1588ac8e9819SChris Mason 1589a48b73ecSJosef Bacik /* 1590a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 1591a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 1592a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 1593a48b73ecSJosef Bacik * properly this next time through 1594a48b73ecSJosef Bacik */ 1595a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 1596a48b73ecSJosef Bacik ret = 0; 1597ba346b35SGerhard Heift goto out; 1598ba346b35SGerhard Heift } 1599ba346b35SGerhard Heift 1600ac8e9819SChris Mason *sk_offset += sizeof(sh); 1601ac8e9819SChris Mason 1602ac8e9819SChris Mason if (item_len) { 1603ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 1604a48b73ecSJosef Bacik /* 1605a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 1606a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 1607a48b73ecSJosef Bacik */ 1608a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 1609ba346b35SGerhard Heift item_off, item_len)) { 1610a48b73ecSJosef Bacik ret = 0; 1611a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 1612ba346b35SGerhard Heift goto out; 1613ba346b35SGerhard Heift } 1614ba346b35SGerhard Heift 1615ac8e9819SChris Mason *sk_offset += item_len; 1616ac8e9819SChris Mason } 1617e2156867SHugo Mills (*num_found)++; 1618ac8e9819SChris Mason 16198f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 16208f5f6178SGerhard Heift goto out; 16218f5f6178SGerhard Heift 162225c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 162325c9bc2eSGerhard Heift ret = 1; 162425c9bc2eSGerhard Heift goto out; 162525c9bc2eSGerhard Heift } 1626ac8e9819SChris Mason } 1627ac8e9819SChris Mason advance_key: 1628ac8e9819SChris Mason ret = 0; 1629dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 1630dd81d459SNaohiro Aota test.type = sk->max_type; 1631dd81d459SNaohiro Aota test.offset = sk->max_offset; 1632dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 1633dd81d459SNaohiro Aota ret = 1; 1634dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 1635abc6e134SChris Mason key->offset++; 1636dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 1637abc6e134SChris Mason key->offset = 0; 1638abc6e134SChris Mason key->type++; 1639dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 1640abc6e134SChris Mason key->offset = 0; 1641abc6e134SChris Mason key->type = 0; 1642abc6e134SChris Mason key->objectid++; 1643abc6e134SChris Mason } else 1644abc6e134SChris Mason ret = 1; 164525c9bc2eSGerhard Heift out: 1646ba346b35SGerhard Heift /* 1647ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 1648ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 1649ba346b35SGerhard Heift * * all items were found 1650ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 1651ba346b35SGerhard Heift * leaf 1652ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 1653ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 1654ba346b35SGerhard Heift */ 1655ac8e9819SChris Mason return ret; 1656ac8e9819SChris Mason } 1657ac8e9819SChris Mason 1658ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 165912544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 16609b6e817dSGerhard Heift size_t *buf_size, 1661ba346b35SGerhard Heift char __user *ubuf) 1662ac8e9819SChris Mason { 16630b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 1664ac8e9819SChris Mason struct btrfs_root *root; 1665ac8e9819SChris Mason struct btrfs_key key; 1666ac8e9819SChris Mason struct btrfs_path *path; 1667ac8e9819SChris Mason int ret; 1668ac8e9819SChris Mason int num_found = 0; 1669ac8e9819SChris Mason unsigned long sk_offset = 0; 1670ac8e9819SChris Mason 16719b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 16729b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 167312544442SGerhard Heift return -EOVERFLOW; 16749b6e817dSGerhard Heift } 167512544442SGerhard Heift 1676ac8e9819SChris Mason path = btrfs_alloc_path(); 1677ac8e9819SChris Mason if (!path) 1678ac8e9819SChris Mason return -ENOMEM; 1679ac8e9819SChris Mason 1680ac8e9819SChris Mason if (sk->tree_id == 0) { 1681ac8e9819SChris Mason /* search the root of the inode that was passed */ 168200246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 1683ac8e9819SChris Mason } else { 168456e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 1685ac8e9819SChris Mason if (IS_ERR(root)) { 1686ac8e9819SChris Mason btrfs_free_path(path); 1687ad1e3d56SMisono Tomohiro return PTR_ERR(root); 1688ac8e9819SChris Mason } 1689ac8e9819SChris Mason } 1690ac8e9819SChris Mason 1691ac8e9819SChris Mason key.objectid = sk->min_objectid; 1692ac8e9819SChris Mason key.type = sk->min_type; 1693ac8e9819SChris Mason key.offset = sk->min_offset; 1694ac8e9819SChris Mason 1695ac8e9819SChris Mason while (1) { 1696bb523b40SAndreas Gruenbacher ret = -EFAULT; 169718788e34SCatalin Marinas /* 169818788e34SCatalin Marinas * Ensure that the whole user buffer is faulted in at sub-page 169918788e34SCatalin Marinas * granularity, otherwise the loop may live-lock. 170018788e34SCatalin Marinas */ 170118788e34SCatalin Marinas if (fault_in_subpage_writeable(ubuf + sk_offset, 170218788e34SCatalin Marinas *buf_size - sk_offset)) 1703a48b73ecSJosef Bacik break; 1704a48b73ecSJosef Bacik 17056174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 1706ac8e9819SChris Mason if (ret != 0) { 1707ac8e9819SChris Mason if (ret > 0) 1708ac8e9819SChris Mason ret = 0; 1709ac8e9819SChris Mason goto err; 1710ac8e9819SChris Mason } 1711df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 1712ac8e9819SChris Mason &sk_offset, &num_found); 1713b3b4aa74SDavid Sterba btrfs_release_path(path); 171425c9bc2eSGerhard Heift if (ret) 1715ac8e9819SChris Mason break; 1716ac8e9819SChris Mason 1717ac8e9819SChris Mason } 17188f5f6178SGerhard Heift if (ret > 0) 1719ac8e9819SChris Mason ret = 0; 1720ac8e9819SChris Mason err: 1721ac8e9819SChris Mason sk->nr_items = num_found; 172200246528SJosef Bacik btrfs_put_root(root); 1723ac8e9819SChris Mason btrfs_free_path(path); 1724ac8e9819SChris Mason return ret; 1725ac8e9819SChris Mason } 1726ac8e9819SChris Mason 17279ad12305SSahil Kang static noinline int btrfs_ioctl_tree_search(struct inode *inode, 1728ac8e9819SChris Mason void __user *argp) 1729ac8e9819SChris Mason { 17300d031dc4SYu Zhe struct btrfs_ioctl_search_args __user *uargs = argp; 1731ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 1732ac8e9819SChris Mason int ret; 17339b6e817dSGerhard Heift size_t buf_size; 1734ac8e9819SChris Mason 1735ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1736ac8e9819SChris Mason return -EPERM; 1737ac8e9819SChris Mason 1738ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 1739ba346b35SGerhard Heift return -EFAULT; 1740ba346b35SGerhard Heift 1741ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 1742ac8e9819SChris Mason 1743ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 17448f5f6178SGerhard Heift 17458f5f6178SGerhard Heift /* 17468f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 17478f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 17488f5f6178SGerhard Heift */ 17498f5f6178SGerhard Heift if (ret == -EOVERFLOW) 17508f5f6178SGerhard Heift ret = 0; 17518f5f6178SGerhard Heift 1752ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 1753ac8e9819SChris Mason ret = -EFAULT; 1754ac8e9819SChris Mason return ret; 1755ac8e9819SChris Mason } 1756ac8e9819SChris Mason 17579ad12305SSahil Kang static noinline int btrfs_ioctl_tree_search_v2(struct inode *inode, 1758cc68a8a5SGerhard Heift void __user *argp) 1759cc68a8a5SGerhard Heift { 17600d031dc4SYu Zhe struct btrfs_ioctl_search_args_v2 __user *uarg = argp; 1761cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 1762cc68a8a5SGerhard Heift int ret; 1763cc68a8a5SGerhard Heift size_t buf_size; 1764ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 1765cc68a8a5SGerhard Heift 1766cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 1767cc68a8a5SGerhard Heift return -EPERM; 1768cc68a8a5SGerhard Heift 1769cc68a8a5SGerhard Heift /* copy search header and buffer size */ 1770cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 1771cc68a8a5SGerhard Heift return -EFAULT; 1772cc68a8a5SGerhard Heift 1773cc68a8a5SGerhard Heift buf_size = args.buf_size; 1774cc68a8a5SGerhard Heift 1775cc68a8a5SGerhard Heift /* limit result size to 16MB */ 1776cc68a8a5SGerhard Heift if (buf_size > buf_limit) 1777cc68a8a5SGerhard Heift buf_size = buf_limit; 1778cc68a8a5SGerhard Heift 1779cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 1780718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 1781cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 1782cc68a8a5SGerhard Heift ret = -EFAULT; 1783cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 1784cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 1785cc68a8a5SGerhard Heift ret = -EFAULT; 1786cc68a8a5SGerhard Heift 178776dda93cSYan, Zheng return ret; 178876dda93cSYan, Zheng } 178976dda93cSYan, Zheng 179098d377a0STARUISI Hiroaki /* 1791ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1792ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 179398d377a0STARUISI Hiroaki */ 179498d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 179598d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 179698d377a0STARUISI Hiroaki { 179798d377a0STARUISI Hiroaki struct btrfs_root *root; 179898d377a0STARUISI Hiroaki struct btrfs_key key; 1799ac8e9819SChris Mason char *ptr; 180098d377a0STARUISI Hiroaki int ret = -1; 180198d377a0STARUISI Hiroaki int slot; 180298d377a0STARUISI Hiroaki int len; 180398d377a0STARUISI Hiroaki int total_len = 0; 180498d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 180598d377a0STARUISI Hiroaki struct extent_buffer *l; 180698d377a0STARUISI Hiroaki struct btrfs_path *path; 180798d377a0STARUISI Hiroaki 180898d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 180998d377a0STARUISI Hiroaki name[0]='\0'; 181098d377a0STARUISI Hiroaki return 0; 181198d377a0STARUISI Hiroaki } 181298d377a0STARUISI Hiroaki 181398d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 181498d377a0STARUISI Hiroaki if (!path) 181598d377a0STARUISI Hiroaki return -ENOMEM; 181698d377a0STARUISI Hiroaki 1817c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 181898d377a0STARUISI Hiroaki 181956e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 182098d377a0STARUISI Hiroaki if (IS_ERR(root)) { 1821ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 182288234012SJosef Bacik root = NULL; 182388234012SJosef Bacik goto out; 182488234012SJosef Bacik } 182598d377a0STARUISI Hiroaki 182698d377a0STARUISI Hiroaki key.objectid = dirid; 182798d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 18288ad6fcabSChris Mason key.offset = (u64)-1; 182998d377a0STARUISI Hiroaki 183098d377a0STARUISI Hiroaki while (1) { 18310ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 183218674c6cSFilipe David Borba Manana if (ret < 0) 183318674c6cSFilipe David Borba Manana goto out; 183418674c6cSFilipe David Borba Manana else if (ret > 0) { 1835ac8e9819SChris Mason ret = -ENOENT; 183698d377a0STARUISI Hiroaki goto out; 1837ac8e9819SChris Mason } 183818674c6cSFilipe David Borba Manana 183918674c6cSFilipe David Borba Manana l = path->nodes[0]; 184018674c6cSFilipe David Borba Manana slot = path->slots[0]; 184198d377a0STARUISI Hiroaki 184298d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 184398d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 184498d377a0STARUISI Hiroaki ptr -= len + 1; 184598d377a0STARUISI Hiroaki total_len += len + 1; 1846a696cf35SFilipe David Borba Manana if (ptr < name) { 1847a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 184898d377a0STARUISI Hiroaki goto out; 1849a696cf35SFilipe David Borba Manana } 185098d377a0STARUISI Hiroaki 185198d377a0STARUISI Hiroaki *(ptr + len) = '/'; 185298d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 185398d377a0STARUISI Hiroaki 185498d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 185598d377a0STARUISI Hiroaki break; 185698d377a0STARUISI Hiroaki 1857b3b4aa74SDavid Sterba btrfs_release_path(path); 185898d377a0STARUISI Hiroaki key.objectid = key.offset; 18598ad6fcabSChris Mason key.offset = (u64)-1; 186098d377a0STARUISI Hiroaki dirid = key.objectid; 186198d377a0STARUISI Hiroaki } 186277906a50SLi Zefan memmove(name, ptr, total_len); 186398d377a0STARUISI Hiroaki name[total_len] = '\0'; 186498d377a0STARUISI Hiroaki ret = 0; 186598d377a0STARUISI Hiroaki out: 186600246528SJosef Bacik btrfs_put_root(root); 186798d377a0STARUISI Hiroaki btrfs_free_path(path); 1868ac8e9819SChris Mason return ret; 1869ac8e9819SChris Mason } 1870ac8e9819SChris Mason 18716623d9a0SChristian Brauner static int btrfs_search_path_in_tree_user(struct user_namespace *mnt_userns, 18726623d9a0SChristian Brauner struct inode *inode, 187323d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 187423d0b79dSTomohiro Misono { 187523d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 187623d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 187723d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 187823d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 187923d0b79dSTomohiro Misono u64 dirid = args->dirid; 188023d0b79dSTomohiro Misono unsigned long item_off; 188123d0b79dSTomohiro Misono unsigned long item_len; 188223d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 188323d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 1884b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 188523d0b79dSTomohiro Misono struct btrfs_path *path; 188623d0b79dSTomohiro Misono struct btrfs_key key, key2; 188723d0b79dSTomohiro Misono struct extent_buffer *leaf; 188823d0b79dSTomohiro Misono struct inode *temp_inode; 188923d0b79dSTomohiro Misono char *ptr; 189023d0b79dSTomohiro Misono int slot; 189123d0b79dSTomohiro Misono int len; 189223d0b79dSTomohiro Misono int total_len = 0; 189323d0b79dSTomohiro Misono int ret; 189423d0b79dSTomohiro Misono 189523d0b79dSTomohiro Misono path = btrfs_alloc_path(); 189623d0b79dSTomohiro Misono if (!path) 189723d0b79dSTomohiro Misono return -ENOMEM; 189823d0b79dSTomohiro Misono 189923d0b79dSTomohiro Misono /* 190023d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 190123d0b79dSTomohiro Misono * construct the path in from the bottom up. 190223d0b79dSTomohiro Misono */ 190323d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 190423d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 190523d0b79dSTomohiro Misono 190656e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 190723d0b79dSTomohiro Misono if (IS_ERR(root)) { 190823d0b79dSTomohiro Misono ret = PTR_ERR(root); 190923d0b79dSTomohiro Misono goto out; 191023d0b79dSTomohiro Misono } 191123d0b79dSTomohiro Misono 191223d0b79dSTomohiro Misono key.objectid = dirid; 191323d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 191423d0b79dSTomohiro Misono key.offset = (u64)-1; 191523d0b79dSTomohiro Misono while (1) { 19160ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 19170ff40a91SMarcos Paulo de Souza if (ret < 0) 1918b8a49ae1SJosef Bacik goto out_put; 19190ff40a91SMarcos Paulo de Souza else if (ret > 0) { 192023d0b79dSTomohiro Misono ret = -ENOENT; 1921b8a49ae1SJosef Bacik goto out_put; 192223d0b79dSTomohiro Misono } 192323d0b79dSTomohiro Misono 192423d0b79dSTomohiro Misono leaf = path->nodes[0]; 192523d0b79dSTomohiro Misono slot = path->slots[0]; 192623d0b79dSTomohiro Misono 192723d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 192823d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 192923d0b79dSTomohiro Misono ptr -= len + 1; 193023d0b79dSTomohiro Misono total_len += len + 1; 193123d0b79dSTomohiro Misono if (ptr < args->path) { 193223d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 1933b8a49ae1SJosef Bacik goto out_put; 193423d0b79dSTomohiro Misono } 193523d0b79dSTomohiro Misono 193623d0b79dSTomohiro Misono *(ptr + len) = '/'; 193723d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 193823d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 193923d0b79dSTomohiro Misono 194023d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 194123d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 194223d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 194323d0b79dSTomohiro Misono if (ret < 0) { 1944b8a49ae1SJosef Bacik goto out_put; 194523d0b79dSTomohiro Misono } else if (ret > 0) { 194623d0b79dSTomohiro Misono ret = -ENOENT; 1947b8a49ae1SJosef Bacik goto out_put; 194823d0b79dSTomohiro Misono } 194923d0b79dSTomohiro Misono 195023d0b79dSTomohiro Misono leaf = path->nodes[0]; 195123d0b79dSTomohiro Misono slot = path->slots[0]; 195223d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 195323d0b79dSTomohiro Misono if (key2.objectid != dirid) { 195423d0b79dSTomohiro Misono ret = -ENOENT; 1955b8a49ae1SJosef Bacik goto out_put; 195623d0b79dSTomohiro Misono } 195723d0b79dSTomohiro Misono 19580202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 19593ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 19603ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 1961b8a49ae1SJosef Bacik goto out_put; 19623ca57bd6SMisono Tomohiro } 19636623d9a0SChristian Brauner ret = inode_permission(mnt_userns, temp_inode, 196447291baaSChristian Brauner MAY_READ | MAY_EXEC); 196523d0b79dSTomohiro Misono iput(temp_inode); 196623d0b79dSTomohiro Misono if (ret) { 196723d0b79dSTomohiro Misono ret = -EACCES; 1968b8a49ae1SJosef Bacik goto out_put; 196923d0b79dSTomohiro Misono } 197023d0b79dSTomohiro Misono 197123d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 197223d0b79dSTomohiro Misono break; 197323d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 197423d0b79dSTomohiro Misono ret = -EACCES; 1975b8a49ae1SJosef Bacik goto out_put; 197623d0b79dSTomohiro Misono } 197723d0b79dSTomohiro Misono 197823d0b79dSTomohiro Misono btrfs_release_path(path); 197923d0b79dSTomohiro Misono key.objectid = key.offset; 198023d0b79dSTomohiro Misono key.offset = (u64)-1; 198123d0b79dSTomohiro Misono dirid = key.objectid; 198223d0b79dSTomohiro Misono } 198323d0b79dSTomohiro Misono 198423d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 198523d0b79dSTomohiro Misono args->path[total_len] = '\0'; 198600246528SJosef Bacik btrfs_put_root(root); 1987b8a49ae1SJosef Bacik root = NULL; 198823d0b79dSTomohiro Misono btrfs_release_path(path); 198923d0b79dSTomohiro Misono } 199023d0b79dSTomohiro Misono 199123d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 199223d0b79dSTomohiro Misono key.objectid = treeid; 199323d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 199423d0b79dSTomohiro Misono key.offset = args->treeid; 1995b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 199623d0b79dSTomohiro Misono if (ret < 0) { 199723d0b79dSTomohiro Misono goto out; 199823d0b79dSTomohiro Misono } else if (ret > 0) { 199923d0b79dSTomohiro Misono ret = -ENOENT; 200023d0b79dSTomohiro Misono goto out; 200123d0b79dSTomohiro Misono } 200223d0b79dSTomohiro Misono 200323d0b79dSTomohiro Misono leaf = path->nodes[0]; 200423d0b79dSTomohiro Misono slot = path->slots[0]; 200523d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 200623d0b79dSTomohiro Misono 200723d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 20083212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot); 200923d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 201023d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 201123d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 201223d0b79dSTomohiro Misono ret = -EINVAL; 201323d0b79dSTomohiro Misono goto out; 201423d0b79dSTomohiro Misono } 201523d0b79dSTomohiro Misono 201623d0b79dSTomohiro Misono /* Copy subvolume's name */ 201723d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 201823d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 201923d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 202023d0b79dSTomohiro Misono args->name[item_len] = 0; 202123d0b79dSTomohiro Misono 2022b8a49ae1SJosef Bacik out_put: 202300246528SJosef Bacik btrfs_put_root(root); 202423d0b79dSTomohiro Misono out: 202523d0b79dSTomohiro Misono btrfs_free_path(path); 202623d0b79dSTomohiro Misono return ret; 202723d0b79dSTomohiro Misono } 202823d0b79dSTomohiro Misono 2029dc408ccdSSahil Kang static noinline int btrfs_ioctl_ino_lookup(struct btrfs_root *root, 2030ac8e9819SChris Mason void __user *argp) 2031ac8e9819SChris Mason { 2032ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 203301b810b8SDavid Sterba int ret = 0; 2034ac8e9819SChris Mason 20352354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 20362354d08fSJulia Lawall if (IS_ERR(args)) 20372354d08fSJulia Lawall return PTR_ERR(args); 2038c2b96929SDan Carpenter 203901b810b8SDavid Sterba /* 204001b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 204101b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 204201b810b8SDavid Sterba */ 20431b53ac4dSChris Mason if (args->treeid == 0) 2044dc408ccdSSahil Kang args->treeid = root->root_key.objectid; 20451b53ac4dSChris Mason 204601b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 204701b810b8SDavid Sterba args->name[0] = 0; 204801b810b8SDavid Sterba goto out; 204901b810b8SDavid Sterba } 205001b810b8SDavid Sterba 205101b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 205201b810b8SDavid Sterba ret = -EPERM; 205301b810b8SDavid Sterba goto out; 205401b810b8SDavid Sterba } 205501b810b8SDavid Sterba 2056dc408ccdSSahil Kang ret = btrfs_search_path_in_tree(root->fs_info, 2057ac8e9819SChris Mason args->treeid, args->objectid, 2058ac8e9819SChris Mason args->name); 2059ac8e9819SChris Mason 206001b810b8SDavid Sterba out: 2061ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2062ac8e9819SChris Mason ret = -EFAULT; 2063ac8e9819SChris Mason 2064ac8e9819SChris Mason kfree(args); 206598d377a0STARUISI Hiroaki return ret; 206698d377a0STARUISI Hiroaki } 206798d377a0STARUISI Hiroaki 206823d0b79dSTomohiro Misono /* 206923d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 207023d0b79dSTomohiro Misono * 207123d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 207223d0b79dSTomohiro Misono * 207323d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 207423d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 207523d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 207623d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 207723d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 207823d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 207923d0b79dSTomohiro Misono */ 208023d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 208123d0b79dSTomohiro Misono { 208223d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 208323d0b79dSTomohiro Misono struct inode *inode; 208423d0b79dSTomohiro Misono int ret; 208523d0b79dSTomohiro Misono 208623d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 208723d0b79dSTomohiro Misono if (IS_ERR(args)) 208823d0b79dSTomohiro Misono return PTR_ERR(args); 208923d0b79dSTomohiro Misono 209023d0b79dSTomohiro Misono inode = file_inode(file); 209123d0b79dSTomohiro Misono 209223d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 209323d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 209423d0b79dSTomohiro Misono /* 209523d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 209623d0b79dSTomohiro Misono * called 209723d0b79dSTomohiro Misono */ 209823d0b79dSTomohiro Misono kfree(args); 209923d0b79dSTomohiro Misono return -EACCES; 210023d0b79dSTomohiro Misono } 210123d0b79dSTomohiro Misono 21026623d9a0SChristian Brauner ret = btrfs_search_path_in_tree_user(file_mnt_user_ns(file), inode, args); 210323d0b79dSTomohiro Misono 210423d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 210523d0b79dSTomohiro Misono ret = -EFAULT; 210623d0b79dSTomohiro Misono 210723d0b79dSTomohiro Misono kfree(args); 210823d0b79dSTomohiro Misono return ret; 210923d0b79dSTomohiro Misono } 211023d0b79dSTomohiro Misono 2111b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 21129ad12305SSahil Kang static int btrfs_ioctl_get_subvol_info(struct inode *inode, void __user *argp) 2113b64ec075STomohiro Misono { 2114b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2115b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2116b64ec075STomohiro Misono struct btrfs_root *root; 2117b64ec075STomohiro Misono struct btrfs_path *path; 2118b64ec075STomohiro Misono struct btrfs_key key; 2119b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2120b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2121b64ec075STomohiro Misono struct extent_buffer *leaf; 2122b64ec075STomohiro Misono unsigned long item_off; 2123b64ec075STomohiro Misono unsigned long item_len; 2124b64ec075STomohiro Misono int slot; 2125b64ec075STomohiro Misono int ret = 0; 2126b64ec075STomohiro Misono 2127b64ec075STomohiro Misono path = btrfs_alloc_path(); 2128b64ec075STomohiro Misono if (!path) 2129b64ec075STomohiro Misono return -ENOMEM; 2130b64ec075STomohiro Misono 2131b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2132b64ec075STomohiro Misono if (!subvol_info) { 2133b64ec075STomohiro Misono btrfs_free_path(path); 2134b64ec075STomohiro Misono return -ENOMEM; 2135b64ec075STomohiro Misono } 2136b64ec075STomohiro Misono 2137b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2138b64ec075STomohiro Misono 2139b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2140b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 214156e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2142b64ec075STomohiro Misono if (IS_ERR(root)) { 2143b64ec075STomohiro Misono ret = PTR_ERR(root); 214404734e84SJosef Bacik goto out_free; 214504734e84SJosef Bacik } 2146b64ec075STomohiro Misono root_item = &root->root_item; 2147b64ec075STomohiro Misono 2148b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2149b64ec075STomohiro Misono 2150b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2151b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2152b64ec075STomohiro Misono 2153b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2154b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2155b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2156b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2157b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2158b64ec075STomohiro Misono 2159b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2160b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2161b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2162b64ec075STomohiro Misono 2163b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2164b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2165b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2166b64ec075STomohiro Misono 2167b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2168b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2169b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2170b64ec075STomohiro Misono 2171b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2172b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2173b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2174b64ec075STomohiro Misono 2175b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2176b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2177b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2178b64ec075STomohiro Misono key.offset = 0; 217904734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2180b64ec075STomohiro Misono if (ret < 0) { 2181b64ec075STomohiro Misono goto out; 2182b64ec075STomohiro Misono } else if (path->slots[0] >= 2183b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 218404734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2185b64ec075STomohiro Misono if (ret < 0) { 2186b64ec075STomohiro Misono goto out; 2187b64ec075STomohiro Misono } else if (ret > 0) { 2188b64ec075STomohiro Misono ret = -EUCLEAN; 2189b64ec075STomohiro Misono goto out; 2190b64ec075STomohiro Misono } 2191b64ec075STomohiro Misono } 2192b64ec075STomohiro Misono 2193b64ec075STomohiro Misono leaf = path->nodes[0]; 2194b64ec075STomohiro Misono slot = path->slots[0]; 2195b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2196b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2197b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2198b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2199b64ec075STomohiro Misono 2200b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2201b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2202b64ec075STomohiro Misono 2203b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2204b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 22053212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot) 2206b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2207b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2208b64ec075STomohiro Misono item_off, item_len); 2209b64ec075STomohiro Misono } else { 2210b64ec075STomohiro Misono ret = -ENOENT; 2211b64ec075STomohiro Misono goto out; 2212b64ec075STomohiro Misono } 2213b64ec075STomohiro Misono } 2214b64ec075STomohiro Misono 2215013c1c55SAnand Jain btrfs_free_path(path); 2216013c1c55SAnand Jain path = NULL; 2217b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2218b64ec075STomohiro Misono ret = -EFAULT; 2219b64ec075STomohiro Misono 2220b64ec075STomohiro Misono out: 222100246528SJosef Bacik btrfs_put_root(root); 222204734e84SJosef Bacik out_free: 2223b64ec075STomohiro Misono btrfs_free_path(path); 2224b091f7feSWaiman Long kfree(subvol_info); 2225b64ec075STomohiro Misono return ret; 2226b64ec075STomohiro Misono } 2227b64ec075STomohiro Misono 222842e4b520STomohiro Misono /* 222942e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 223042e4b520STomohiro Misono * except the subvolume name. 223142e4b520STomohiro Misono */ 22329ad12305SSahil Kang static int btrfs_ioctl_get_subvol_rootref(struct btrfs_root *root, 2233dc408ccdSSahil Kang void __user *argp) 223442e4b520STomohiro Misono { 223542e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 223642e4b520STomohiro Misono struct btrfs_root_ref *rref; 223742e4b520STomohiro Misono struct btrfs_path *path; 223842e4b520STomohiro Misono struct btrfs_key key; 223942e4b520STomohiro Misono struct extent_buffer *leaf; 224042e4b520STomohiro Misono u64 objectid; 224142e4b520STomohiro Misono int slot; 224242e4b520STomohiro Misono int ret; 224342e4b520STomohiro Misono u8 found; 224442e4b520STomohiro Misono 224542e4b520STomohiro Misono path = btrfs_alloc_path(); 224642e4b520STomohiro Misono if (!path) 224742e4b520STomohiro Misono return -ENOMEM; 224842e4b520STomohiro Misono 224942e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 225042e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 225142e4b520STomohiro Misono btrfs_free_path(path); 225242e4b520STomohiro Misono return PTR_ERR(rootrefs); 225342e4b520STomohiro Misono } 225442e4b520STomohiro Misono 22559ad12305SSahil Kang objectid = root->root_key.objectid; 225642e4b520STomohiro Misono key.objectid = objectid; 225742e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 225842e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 225942e4b520STomohiro Misono found = 0; 226042e4b520STomohiro Misono 22619ad12305SSahil Kang root = root->fs_info->tree_root; 226242e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 226342e4b520STomohiro Misono if (ret < 0) { 226442e4b520STomohiro Misono goto out; 226542e4b520STomohiro Misono } else if (path->slots[0] >= 226642e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 226742e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 226842e4b520STomohiro Misono if (ret < 0) { 226942e4b520STomohiro Misono goto out; 227042e4b520STomohiro Misono } else if (ret > 0) { 227142e4b520STomohiro Misono ret = -EUCLEAN; 227242e4b520STomohiro Misono goto out; 227342e4b520STomohiro Misono } 227442e4b520STomohiro Misono } 227542e4b520STomohiro Misono while (1) { 227642e4b520STomohiro Misono leaf = path->nodes[0]; 227742e4b520STomohiro Misono slot = path->slots[0]; 227842e4b520STomohiro Misono 227942e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 228042e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 228142e4b520STomohiro Misono ret = 0; 228242e4b520STomohiro Misono goto out; 228342e4b520STomohiro Misono } 228442e4b520STomohiro Misono 228542e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 228642e4b520STomohiro Misono ret = -EOVERFLOW; 228742e4b520STomohiro Misono goto out; 228842e4b520STomohiro Misono } 228942e4b520STomohiro Misono 229042e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 229142e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 229242e4b520STomohiro Misono rootrefs->rootref[found].dirid = 229342e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 229442e4b520STomohiro Misono found++; 229542e4b520STomohiro Misono 229642e4b520STomohiro Misono ret = btrfs_next_item(root, path); 229742e4b520STomohiro Misono if (ret < 0) { 229842e4b520STomohiro Misono goto out; 229942e4b520STomohiro Misono } else if (ret > 0) { 230042e4b520STomohiro Misono ret = -EUCLEAN; 230142e4b520STomohiro Misono goto out; 230242e4b520STomohiro Misono } 230342e4b520STomohiro Misono } 230442e4b520STomohiro Misono 230542e4b520STomohiro Misono out: 2306b740d806SJosef Bacik btrfs_free_path(path); 2307b740d806SJosef Bacik 230842e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 230942e4b520STomohiro Misono rootrefs->num_items = found; 231042e4b520STomohiro Misono /* update min_treeid for next search */ 231142e4b520STomohiro Misono if (found) 231242e4b520STomohiro Misono rootrefs->min_treeid = 231342e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 231442e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 231542e4b520STomohiro Misono ret = -EFAULT; 231642e4b520STomohiro Misono } 231742e4b520STomohiro Misono 231842e4b520STomohiro Misono kfree(rootrefs); 231942e4b520STomohiro Misono 232042e4b520STomohiro Misono return ret; 232142e4b520STomohiro Misono } 232242e4b520STomohiro Misono 232376dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2324949964c9SMarcos Paulo de Souza void __user *arg, 2325949964c9SMarcos Paulo de Souza bool destroy_v2) 232676dda93cSYan, Zheng { 232754563d41SAl Viro struct dentry *parent = file->f_path.dentry; 23280b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 232976dda93cSYan, Zheng struct dentry *dentry; 23302b0143b5SDavid Howells struct inode *dir = d_inode(parent); 233176dda93cSYan, Zheng struct inode *inode; 233276dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 233376dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2334949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2335949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 2336c4ed533bSChristian Brauner struct user_namespace *mnt_userns = file_mnt_user_ns(file); 2337949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2338949964c9SMarcos Paulo de Souza int subvol_namelen; 233976dda93cSYan, Zheng int err = 0; 2340949964c9SMarcos Paulo de Souza bool destroy_parent = false; 234176dda93cSYan, Zheng 2342813febdbSJosef Bacik /* We don't support snapshots with extent tree v2 yet. */ 2343813febdbSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 2344813febdbSJosef Bacik btrfs_err(fs_info, 2345813febdbSJosef Bacik "extent tree v2 doesn't support snapshot deletion yet"); 2346813febdbSJosef Bacik return -EOPNOTSUPP; 2347813febdbSJosef Bacik } 2348813febdbSJosef Bacik 2349949964c9SMarcos Paulo de Souza if (destroy_v2) { 2350949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2351949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2352949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2353325c50e3SJeff Mahoney 2354949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2355949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2356949964c9SMarcos Paulo de Souza goto out; 2357949964c9SMarcos Paulo de Souza } 235876dda93cSYan, Zheng 2359949964c9SMarcos Paulo de Souza /* 2360949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2361949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2362949964c9SMarcos Paulo de Souza */ 2363949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2364949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2365949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2366949964c9SMarcos Paulo de Souza 2367949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2368949964c9SMarcos Paulo de Souza if (err) 2369949964c9SMarcos Paulo de Souza goto out; 2370949964c9SMarcos Paulo de Souza } else { 2371aabb34e7SChristian Brauner struct inode *old_dir; 2372c4ed533bSChristian Brauner 2373949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 237476dda93cSYan, Zheng err = -EINVAL; 237576dda93cSYan, Zheng goto out; 237676dda93cSYan, Zheng } 237776dda93cSYan, Zheng 2378a561be71SAl Viro err = mnt_want_write_file(file); 237976dda93cSYan, Zheng if (err) 238076dda93cSYan, Zheng goto out; 238176dda93cSYan, Zheng 2382949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 2383949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 2384b307f06dSDavid Sterba vol_args2->subvolid, 0); 2385949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 2386949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 2387949964c9SMarcos Paulo de Souza goto out_drop_write; 2388949964c9SMarcos Paulo de Souza } 2389949964c9SMarcos Paulo de Souza 2390949964c9SMarcos Paulo de Souza /* 2391949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 2392949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 2393949964c9SMarcos Paulo de Souza */ 2394949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 2395949964c9SMarcos Paulo de Souza 2396949964c9SMarcos Paulo de Souza /* 2397949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 2398949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 2399949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 2400949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 2401949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 2402949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 2403949964c9SMarcos Paulo de Souza */ 2404949964c9SMarcos Paulo de Souza dput(dentry); 2405949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 2406949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 2407949964c9SMarcos Paulo de Souza goto out_drop_write; 2408949964c9SMarcos Paulo de Souza } 2409aabb34e7SChristian Brauner old_dir = dir; 2410949964c9SMarcos Paulo de Souza dir = d_inode(parent); 2411949964c9SMarcos Paulo de Souza 2412949964c9SMarcos Paulo de Souza /* 2413949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 2414949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 2415949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 2416949964c9SMarcos Paulo de Souza * new parent dentry. 2417949964c9SMarcos Paulo de Souza */ 2418949964c9SMarcos Paulo de Souza destroy_parent = true; 2419949964c9SMarcos Paulo de Souza 2420aabb34e7SChristian Brauner /* 2421aabb34e7SChristian Brauner * On idmapped mounts, deletion via subvolid is 2422aabb34e7SChristian Brauner * restricted to subvolumes that are immediate 2423aabb34e7SChristian Brauner * ancestors of the inode referenced by the file 2424aabb34e7SChristian Brauner * descriptor in the ioctl. Otherwise the idmapping 2425aabb34e7SChristian Brauner * could potentially be abused to delete subvolumes 2426aabb34e7SChristian Brauner * anywhere in the filesystem the user wouldn't be able 2427aabb34e7SChristian Brauner * to delete without an idmapped mount. 2428aabb34e7SChristian Brauner */ 2429aabb34e7SChristian Brauner if (old_dir != dir && mnt_userns != &init_user_ns) { 2430aabb34e7SChristian Brauner err = -EOPNOTSUPP; 2431aabb34e7SChristian Brauner goto free_parent; 2432aabb34e7SChristian Brauner } 2433aabb34e7SChristian Brauner 2434949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 2435949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 2436949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 2437949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 2438949964c9SMarcos Paulo de Souza goto free_parent; 2439949964c9SMarcos Paulo de Souza } 24401a9fd417SDavid Sterba /* subvol_name_ptr is already nul terminated */ 2441949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 2442949964c9SMarcos Paulo de Souza } 2443949964c9SMarcos Paulo de Souza } else { 2444949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 2445949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 2446949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 2447949964c9SMarcos Paulo de Souza 2448949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 2449949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 2450949964c9SMarcos Paulo de Souza 2451949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2452949964c9SMarcos Paulo de Souza if (err) 2453949964c9SMarcos Paulo de Souza goto out; 2454949964c9SMarcos Paulo de Souza } 2455949964c9SMarcos Paulo de Souza 2456949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 2457949964c9SMarcos Paulo de Souza 2458949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 2459949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 2460949964c9SMarcos Paulo de Souza err = -EINVAL; 2461949964c9SMarcos Paulo de Souza goto free_subvol_name; 2462949964c9SMarcos Paulo de Souza } 2463949964c9SMarcos Paulo de Souza 2464949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 2465949964c9SMarcos Paulo de Souza err = -ENOTDIR; 2466949964c9SMarcos Paulo de Souza goto free_subvol_name; 2467949964c9SMarcos Paulo de Souza } 2468521e0546SDavid Sterba 246900235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 247000235411SAl Viro if (err == -EINTR) 2471949964c9SMarcos Paulo de Souza goto free_subvol_name; 2472c4ed533bSChristian Brauner dentry = lookup_one(mnt_userns, subvol_name, parent, subvol_namelen); 247376dda93cSYan, Zheng if (IS_ERR(dentry)) { 247476dda93cSYan, Zheng err = PTR_ERR(dentry); 247576dda93cSYan, Zheng goto out_unlock_dir; 247676dda93cSYan, Zheng } 247776dda93cSYan, Zheng 24782b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 247976dda93cSYan, Zheng err = -ENOENT; 248076dda93cSYan, Zheng goto out_dput; 248176dda93cSYan, Zheng } 248276dda93cSYan, Zheng 24832b0143b5SDavid Howells inode = d_inode(dentry); 24844260f7c7SSage Weil dest = BTRFS_I(inode)->root; 24854260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 24864260f7c7SSage Weil /* 24874260f7c7SSage Weil * Regular user. Only allow this with a special mount 24884260f7c7SSage Weil * option, when the user has write+exec access to the 24894260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 24904260f7c7SSage Weil * allowed. 24914260f7c7SSage Weil * 24924260f7c7SSage Weil * Note that this is _not_ check that the subvol is 24934260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 24944260f7c7SSage Weil * otherwise be able to delete. 24954260f7c7SSage Weil * 24964260f7c7SSage Weil * Users who want to delete empty subvols should try 24974260f7c7SSage Weil * rmdir(2). 24984260f7c7SSage Weil */ 24994260f7c7SSage Weil err = -EPERM; 25000b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 25014260f7c7SSage Weil goto out_dput; 25024260f7c7SSage Weil 25034260f7c7SSage Weil /* 25044260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 25054260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 25064260f7c7SSage Weil * must be called on the dentry referencing the root 25074260f7c7SSage Weil * of the subvol, not a random directory contained 25084260f7c7SSage Weil * within it. 25094260f7c7SSage Weil */ 25104260f7c7SSage Weil err = -EINVAL; 25114260f7c7SSage Weil if (root == dest) 25124260f7c7SSage Weil goto out_dput; 25134260f7c7SSage Weil 2514c4ed533bSChristian Brauner err = inode_permission(mnt_userns, inode, MAY_WRITE | MAY_EXEC); 25154260f7c7SSage Weil if (err) 25164260f7c7SSage Weil goto out_dput; 25175c39da5bSMiao Xie } 25184260f7c7SSage Weil 25195c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 2520c4ed533bSChristian Brauner err = btrfs_may_delete(mnt_userns, dir, dentry, 1); 25214260f7c7SSage Weil if (err) 25224260f7c7SSage Weil goto out_dput; 25234260f7c7SSage Weil 25244a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 252576dda93cSYan, Zheng err = -EINVAL; 252676dda93cSYan, Zheng goto out_dput; 252776dda93cSYan, Zheng } 252876dda93cSYan, Zheng 252964708539SJosef Bacik btrfs_inode_lock(inode, 0); 2530f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 253164708539SJosef Bacik btrfs_inode_unlock(inode, 0); 2532a37d9a17SAmir Goldstein if (!err) 2533a37d9a17SAmir Goldstein d_delete_notify(dir, dentry); 2534fa6ac876SLiu Bo 253576dda93cSYan, Zheng out_dput: 253676dda93cSYan, Zheng dput(dentry); 253776dda93cSYan, Zheng out_unlock_dir: 253864708539SJosef Bacik btrfs_inode_unlock(dir, 0); 2539949964c9SMarcos Paulo de Souza free_subvol_name: 2540949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 2541949964c9SMarcos Paulo de Souza free_parent: 2542949964c9SMarcos Paulo de Souza if (destroy_parent) 2543949964c9SMarcos Paulo de Souza dput(parent); 254400235411SAl Viro out_drop_write: 25452a79f17eSAl Viro mnt_drop_write_file(file); 254676dda93cSYan, Zheng out: 2547949964c9SMarcos Paulo de Souza kfree(vol_args2); 254876dda93cSYan, Zheng kfree(vol_args); 254976dda93cSYan, Zheng return err; 255076dda93cSYan, Zheng } 255176dda93cSYan, Zheng 25521e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2553f46b5a66SChristoph Hellwig { 2554496ad9aaSAl Viro struct inode *inode = file_inode(file); 2555f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2556c853a578SGoldwyn Rodrigues struct btrfs_ioctl_defrag_range_args range = {0}; 2557c146afadSYan Zheng int ret; 2558c146afadSYan Zheng 255925122d15SIlya Dryomov ret = mnt_want_write_file(file); 256025122d15SIlya Dryomov if (ret) 256125122d15SIlya Dryomov return ret; 2562b83cc969SLi Zefan 256325122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 256425122d15SIlya Dryomov ret = -EROFS; 256525122d15SIlya Dryomov goto out; 25665ac00addSStefan Behrens } 2567f46b5a66SChristoph Hellwig 2568f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2569f46b5a66SChristoph Hellwig case S_IFDIR: 2570e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2571e441d54dSChris Mason ret = -EPERM; 2572e441d54dSChris Mason goto out; 2573e441d54dSChris Mason } 2574de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 2575f46b5a66SChristoph Hellwig break; 2576f46b5a66SChristoph Hellwig case S_IFREG: 2577616d374eSAdam Borowski /* 2578616d374eSAdam Borowski * Note that this does not check the file descriptor for write 2579616d374eSAdam Borowski * access. This prevents defragmenting executables that are 2580616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 2581616d374eSAdam Borowski */ 2582616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 258347291baaSChristian Brauner inode_permission(&init_user_ns, inode, MAY_WRITE)) { 2584616d374eSAdam Borowski ret = -EPERM; 2585e441d54dSChris Mason goto out; 2586e441d54dSChris Mason } 25871e701a32SChris Mason 25881e701a32SChris Mason if (argp) { 2589c853a578SGoldwyn Rodrigues if (copy_from_user(&range, argp, sizeof(range))) { 25901e701a32SChris Mason ret = -EFAULT; 2591683be16eSDan Carpenter goto out; 25921e701a32SChris Mason } 25931e701a32SChris Mason /* compression requires us to start the IO */ 2594c853a578SGoldwyn Rodrigues if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 2595c853a578SGoldwyn Rodrigues range.flags |= BTRFS_DEFRAG_RANGE_START_IO; 2596c853a578SGoldwyn Rodrigues range.extent_thresh = (u32)-1; 25971e701a32SChris Mason } 25981e701a32SChris Mason } else { 25991e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 2600c853a578SGoldwyn Rodrigues range.len = (u64)-1; 26011e701a32SChris Mason } 26021ccc2e8aSQu Wenruo ret = btrfs_defrag_file(file_inode(file), &file->f_ra, 2603c853a578SGoldwyn Rodrigues &range, BTRFS_OLDEST_GENERATION, 0); 26044cb5300bSChris Mason if (ret > 0) 26054cb5300bSChris Mason ret = 0; 2606f46b5a66SChristoph Hellwig break; 26078929ecfaSYan, Zheng default: 26088929ecfaSYan, Zheng ret = -EINVAL; 2609f46b5a66SChristoph Hellwig } 2610e441d54dSChris Mason out: 261125122d15SIlya Dryomov mnt_drop_write_file(file); 2612e441d54dSChris Mason return ret; 2613f46b5a66SChristoph Hellwig } 2614f46b5a66SChristoph Hellwig 26152ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 2616f46b5a66SChristoph Hellwig { 2617f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2618a174c0a2SNikolay Borisov bool restore_op = false; 2619f46b5a66SChristoph Hellwig int ret; 2620f46b5a66SChristoph Hellwig 2621e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2622e441d54dSChris Mason return -EPERM; 2623e441d54dSChris Mason 2624914a519bSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 2625914a519bSJosef Bacik btrfs_err(fs_info, "device add not supported on extent tree v2 yet"); 2626914a519bSJosef Bacik return -EINVAL; 2627914a519bSJosef Bacik } 2628914a519bSJosef Bacik 2629a174c0a2SNikolay Borisov if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) { 2630a174c0a2SNikolay Borisov if (!btrfs_exclop_start_try_lock(fs_info, BTRFS_EXCLOP_DEV_ADD)) 2631e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2632c9e9f97bSIlya Dryomov 2633a174c0a2SNikolay Borisov /* 2634a174c0a2SNikolay Borisov * We can do the device add because we have a paused balanced, 2635a174c0a2SNikolay Borisov * change the exclusive op type and remember we should bring 2636a174c0a2SNikolay Borisov * back the paused balance 2637a174c0a2SNikolay Borisov */ 2638a174c0a2SNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_DEV_ADD; 2639a174c0a2SNikolay Borisov btrfs_exclop_start_unlock(fs_info); 2640a174c0a2SNikolay Borisov restore_op = true; 2641a174c0a2SNikolay Borisov } 2642a174c0a2SNikolay Borisov 2643dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2644c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2645c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2646c9e9f97bSIlya Dryomov goto out; 2647c9e9f97bSIlya Dryomov } 2648f46b5a66SChristoph Hellwig 26495516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 26502ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 2651f46b5a66SChristoph Hellwig 265243d20761SAnand Jain if (!ret) 26530b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 265443d20761SAnand Jain 2655f46b5a66SChristoph Hellwig kfree(vol_args); 2656c9e9f97bSIlya Dryomov out: 2657a174c0a2SNikolay Borisov if (restore_op) 2658a174c0a2SNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED); 2659a174c0a2SNikolay Borisov else 2660c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 2661f46b5a66SChristoph Hellwig return ret; 2662f46b5a66SChristoph Hellwig } 2663f46b5a66SChristoph Hellwig 26646b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 2665f46b5a66SChristoph Hellwig { 26661a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 26670b246afaSJeff Mahoney struct inode *inode = file_inode(file); 26680b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 26696b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 26703fa421deSJosef Bacik struct block_device *bdev = NULL; 26713fa421deSJosef Bacik fmode_t mode; 2672f46b5a66SChristoph Hellwig int ret; 267367ae34b6SDavid Sterba bool cancel = false; 2674f46b5a66SChristoph Hellwig 2675e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2676e441d54dSChris Mason return -EPERM; 2677e441d54dSChris Mason 2678dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2679d815b3f2SDan Carpenter if (IS_ERR(vol_args)) 2680d815b3f2SDan Carpenter return PTR_ERR(vol_args); 2681f46b5a66SChristoph Hellwig 2682748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 2683fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 2684fd4e994bSOmar Sandoval goto out; 2685fd4e994bSOmar Sandoval } 26861a15eb72SJosef Bacik 26876b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 26881a15eb72SJosef Bacik if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 26891a15eb72SJosef Bacik args.devid = vol_args->devid; 26901a15eb72SJosef Bacik } else if (!strcmp("cancel", vol_args->name)) { 269167ae34b6SDavid Sterba cancel = true; 26921a15eb72SJosef Bacik } else { 26931a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 26941a15eb72SJosef Bacik if (ret) 26951a15eb72SJosef Bacik goto out; 26961a15eb72SJosef Bacik } 26971a15eb72SJosef Bacik 26981a15eb72SJosef Bacik ret = mnt_want_write_file(file); 26991a15eb72SJosef Bacik if (ret) 27001a15eb72SJosef Bacik goto out; 270167ae34b6SDavid Sterba 270267ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 270367ae34b6SDavid Sterba cancel); 270467ae34b6SDavid Sterba if (ret) 27051a15eb72SJosef Bacik goto err_drop; 270667ae34b6SDavid Sterba 27071a15eb72SJosef Bacik /* Exclusive operation is now claimed */ 27081a15eb72SJosef Bacik ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); 270967ae34b6SDavid Sterba 2710c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 2711183860f6SAnand Jain 27126b526ed7SAnand Jain if (!ret) { 2713735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 27140b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 27156b526ed7SAnand Jain vol_args->devid); 27166b526ed7SAnand Jain else 27170b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 27186b526ed7SAnand Jain vol_args->name); 27196b526ed7SAnand Jain } 2720c47ca32dSDan Carpenter err_drop: 27214ac20c70SIlya Dryomov mnt_drop_write_file(file); 27223fa421deSJosef Bacik if (bdev) 27233fa421deSJosef Bacik blkdev_put(bdev, mode); 27241a15eb72SJosef Bacik out: 27251a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 27261a15eb72SJosef Bacik kfree(vol_args); 2727f46b5a66SChristoph Hellwig return ret; 2728f46b5a66SChristoph Hellwig } 2729f46b5a66SChristoph Hellwig 2730f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2731f46b5a66SChristoph Hellwig { 27321a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 27330b246afaSJeff Mahoney struct inode *inode = file_inode(file); 27340b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 2735f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 27363fa421deSJosef Bacik struct block_device *bdev = NULL; 27373fa421deSJosef Bacik fmode_t mode; 2738f46b5a66SChristoph Hellwig int ret; 273937b45995STom Rix bool cancel = false; 2740f46b5a66SChristoph Hellwig 2741f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 2742f46b5a66SChristoph Hellwig return -EPERM; 2743f46b5a66SChristoph Hellwig 27441a15eb72SJosef Bacik vol_args = memdup_user(arg, sizeof(*vol_args)); 27451a15eb72SJosef Bacik if (IS_ERR(vol_args)) 27461a15eb72SJosef Bacik return PTR_ERR(vol_args); 27471a15eb72SJosef Bacik 27481a15eb72SJosef Bacik vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 27491a15eb72SJosef Bacik if (!strcmp("cancel", vol_args->name)) { 27501a15eb72SJosef Bacik cancel = true; 27511a15eb72SJosef Bacik } else { 27521a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 27531a15eb72SJosef Bacik if (ret) 27541a15eb72SJosef Bacik goto out; 27551a15eb72SJosef Bacik } 27561a15eb72SJosef Bacik 2757f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 2758f46b5a66SChristoph Hellwig if (ret) 27591a15eb72SJosef Bacik goto out; 2760f46b5a66SChristoph Hellwig 276167ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 276267ae34b6SDavid Sterba cancel); 276367ae34b6SDavid Sterba if (ret == 0) { 27641a15eb72SJosef Bacik ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); 2765f46b5a66SChristoph Hellwig if (!ret) 27660b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 2767c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 276867ae34b6SDavid Sterba } 276967ae34b6SDavid Sterba 2770f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 27713fa421deSJosef Bacik if (bdev) 27723fa421deSJosef Bacik blkdev_put(bdev, mode); 27731a15eb72SJosef Bacik out: 27741a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 27751a15eb72SJosef Bacik kfree(vol_args); 2776f46b5a66SChristoph Hellwig return ret; 2777f46b5a66SChristoph Hellwig } 2778f46b5a66SChristoph Hellwig 27792ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 27802ff7e61eSJeff Mahoney void __user *arg) 2781475f6387SJan Schmidt { 2782027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2783475f6387SJan Schmidt struct btrfs_device *device; 27840b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 2785137c5418SJohannes Thumshirn u64 flags_in; 2786027ed2f0SLi Zefan int ret = 0; 2787475f6387SJan Schmidt 2788137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 2789137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 2790137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 2791137c5418SJohannes Thumshirn 2792137c5418SJohannes Thumshirn flags_in = fi_args->flags; 2793137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 2794027ed2f0SLi Zefan 2795d03262c7SDavid Sterba rcu_read_lock(); 2796027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2797475f6387SJan Schmidt 2798d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 2799027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2800027ed2f0SLi Zefan fi_args->max_id = device->devid; 2801475f6387SJan Schmidt } 2802d03262c7SDavid Sterba rcu_read_unlock(); 2803475f6387SJan Schmidt 2804de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 2805bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 2806bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 2807bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 280880a773fbSDavid Sterba 2809137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 2810137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 2811137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 2812137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 2813137c5418SJohannes Thumshirn } 2814137c5418SJohannes Thumshirn 28150fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 28160fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 28170fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 28180fb408a5SJohannes Thumshirn } 28190fb408a5SJohannes Thumshirn 282049bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 282149bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 282249bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 282349bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 282449bac897SJohannes Thumshirn } 282549bac897SJohannes Thumshirn 2826027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2827027ed2f0SLi Zefan ret = -EFAULT; 2828475f6387SJan Schmidt 2829027ed2f0SLi Zefan kfree(fi_args); 2830027ed2f0SLi Zefan return ret; 2831475f6387SJan Schmidt } 2832475f6387SJan Schmidt 28332ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 28342ff7e61eSJeff Mahoney void __user *arg) 2835475f6387SJan Schmidt { 2836562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 2837475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2838475f6387SJan Schmidt struct btrfs_device *dev; 2839475f6387SJan Schmidt int ret = 0; 2840475f6387SJan Schmidt 2841475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2842475f6387SJan Schmidt if (IS_ERR(di_args)) 2843475f6387SJan Schmidt return PTR_ERR(di_args); 2844475f6387SJan Schmidt 2845562d7b15SJosef Bacik args.devid = di_args->devid; 2846dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 2847562d7b15SJosef Bacik args.uuid = di_args->uuid; 2848475f6387SJan Schmidt 2849c5593ca3SDavid Sterba rcu_read_lock(); 2850562d7b15SJosef Bacik dev = btrfs_find_device(fs_info->fs_devices, &args); 2851475f6387SJan Schmidt if (!dev) { 2852475f6387SJan Schmidt ret = -ENODEV; 2853475f6387SJan Schmidt goto out; 2854475f6387SJan Schmidt } 2855475f6387SJan Schmidt 2856475f6387SJan Schmidt di_args->devid = dev->devid; 28577cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 28587cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 2859475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2860a27202fbSJim Meyering if (dev->name) { 2861672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 2862672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 2863a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2864a27202fbSJim Meyering } else { 286599ba55adSStefan Behrens di_args->path[0] = '\0'; 2866a27202fbSJim Meyering } 2867475f6387SJan Schmidt 2868475f6387SJan Schmidt out: 2869c5593ca3SDavid Sterba rcu_read_unlock(); 2870475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2871475f6387SJan Schmidt ret = -EFAULT; 2872475f6387SJan Schmidt 2873475f6387SJan Schmidt kfree(di_args); 2874475f6387SJan Schmidt return ret; 2875475f6387SJan Schmidt } 2876475f6387SJan Schmidt 28776ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 28786ef5ed0dSJosef Bacik { 2879496ad9aaSAl Viro struct inode *inode = file_inode(file); 28800b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 28816ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 28826ef5ed0dSJosef Bacik struct btrfs_root *new_root; 28836ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 28846ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 28852a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 28866ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 28876db75318SSweet Tea Dorminy struct fscrypt_str name = FSTR_INIT("default", 7); 28886ef5ed0dSJosef Bacik u64 objectid = 0; 28896ef5ed0dSJosef Bacik u64 dir_id; 28903c04ce01SMiao Xie int ret; 28916ef5ed0dSJosef Bacik 28926ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 28936ef5ed0dSJosef Bacik return -EPERM; 28946ef5ed0dSJosef Bacik 28953c04ce01SMiao Xie ret = mnt_want_write_file(file); 28963c04ce01SMiao Xie if (ret) 28973c04ce01SMiao Xie return ret; 28983c04ce01SMiao Xie 28993c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 29003c04ce01SMiao Xie ret = -EFAULT; 29013c04ce01SMiao Xie goto out; 29023c04ce01SMiao Xie } 29036ef5ed0dSJosef Bacik 29046ef5ed0dSJosef Bacik if (!objectid) 29051cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 29066ef5ed0dSJosef Bacik 290756e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 29083c04ce01SMiao Xie if (IS_ERR(new_root)) { 29093c04ce01SMiao Xie ret = PTR_ERR(new_root); 29103c04ce01SMiao Xie goto out; 29113c04ce01SMiao Xie } 29122a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 29132a2b5d62SJosef Bacik ret = -ENOENT; 29142a2b5d62SJosef Bacik goto out_free; 29152a2b5d62SJosef Bacik } 29166ef5ed0dSJosef Bacik 29176ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 29183c04ce01SMiao Xie if (!path) { 29193c04ce01SMiao Xie ret = -ENOMEM; 29202a2b5d62SJosef Bacik goto out_free; 29213c04ce01SMiao Xie } 29226ef5ed0dSJosef Bacik 29236ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 292498d5dc13STsutomu Itoh if (IS_ERR(trans)) { 29253c04ce01SMiao Xie ret = PTR_ERR(trans); 29262a2b5d62SJosef Bacik goto out_free; 29276ef5ed0dSJosef Bacik } 29286ef5ed0dSJosef Bacik 29290b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 29300b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 2931e43eec81SSweet Tea Dorminy dir_id, &name, 1); 2932cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 29332a2b5d62SJosef Bacik btrfs_release_path(path); 29343a45bb20SJeff Mahoney btrfs_end_transaction(trans); 29350b246afaSJeff Mahoney btrfs_err(fs_info, 29365d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 29373c04ce01SMiao Xie ret = -ENOENT; 29382a2b5d62SJosef Bacik goto out_free; 29396ef5ed0dSJosef Bacik } 29406ef5ed0dSJosef Bacik 29416ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 29426ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 29436ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 29442a2b5d62SJosef Bacik btrfs_release_path(path); 29456ef5ed0dSJosef Bacik 29460b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 29473a45bb20SJeff Mahoney btrfs_end_transaction(trans); 29482a2b5d62SJosef Bacik out_free: 294900246528SJosef Bacik btrfs_put_root(new_root); 29502a2b5d62SJosef Bacik btrfs_free_path(path); 29513c04ce01SMiao Xie out: 29523c04ce01SMiao Xie mnt_drop_write_file(file); 29533c04ce01SMiao Xie return ret; 29546ef5ed0dSJosef Bacik } 29556ef5ed0dSJosef Bacik 2956c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 2957bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 2958bf5fc093SJosef Bacik { 295932da5386SDavid Sterba struct btrfs_block_group *block_group; 2960bf5fc093SJosef Bacik 2961bf5fc093SJosef Bacik space->total_bytes = 0; 2962bf5fc093SJosef Bacik space->used_bytes = 0; 2963bf5fc093SJosef Bacik space->flags = 0; 2964bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 2965bf5fc093SJosef Bacik space->flags = block_group->flags; 2966b3470b5dSDavid Sterba space->total_bytes += block_group->length; 2967bf38be65SDavid Sterba space->used_bytes += block_group->used; 2968bf5fc093SJosef Bacik } 2969bf5fc093SJosef Bacik } 2970bf5fc093SJosef Bacik 29712ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 29722ff7e61eSJeff Mahoney void __user *arg) 29731406e432SJosef Bacik { 29741406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 29751406e432SJosef Bacik struct btrfs_ioctl_space_info space; 29761406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 29777fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 297813f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 29791406e432SJosef Bacik struct btrfs_space_info *info; 2980315d8e98SColin Ian King static const u64 types[] = { 2981315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 2982bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 2983bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 2984315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 2985315d8e98SColin Ian King }; 2986bf5fc093SJosef Bacik int num_types = 4; 29877fde62bfSChris Mason int alloc_size; 29881406e432SJosef Bacik int ret = 0; 298951788b1bSDan Rosenberg u64 slot_count = 0; 2990bf5fc093SJosef Bacik int i, c; 29911406e432SJosef Bacik 29921406e432SJosef Bacik if (copy_from_user(&space_args, 29931406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 29941406e432SJosef Bacik sizeof(space_args))) 29951406e432SJosef Bacik return -EFAULT; 29961406e432SJosef Bacik 2997bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2998bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2999bf5fc093SJosef Bacik 3000bf5fc093SJosef Bacik info = NULL; 300172804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3002bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3003bf5fc093SJosef Bacik info = tmp; 3004bf5fc093SJosef Bacik break; 3005bf5fc093SJosef Bacik } 3006bf5fc093SJosef Bacik } 30071406e432SJosef Bacik 3008bf5fc093SJosef Bacik if (!info) 3009bf5fc093SJosef Bacik continue; 3010bf5fc093SJosef Bacik 3011bf5fc093SJosef Bacik down_read(&info->groups_sem); 3012bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3013bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3014bf5fc093SJosef Bacik slot_count++; 3015bf5fc093SJosef Bacik } 3016bf5fc093SJosef Bacik up_read(&info->groups_sem); 3017bf5fc093SJosef Bacik } 3018bf5fc093SJosef Bacik 301936523e95SDavid Sterba /* 302036523e95SDavid Sterba * Global block reserve, exported as a space_info 302136523e95SDavid Sterba */ 302236523e95SDavid Sterba slot_count++; 302336523e95SDavid Sterba 30247fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 30257fde62bfSChris Mason if (space_args.space_slots == 0) { 30267fde62bfSChris Mason space_args.total_spaces = slot_count; 30277fde62bfSChris Mason goto out; 30287fde62bfSChris Mason } 3029bf5fc093SJosef Bacik 303051788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3031bf5fc093SJosef Bacik 30327fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3033bf5fc093SJosef Bacik 30347fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 30357fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 30367fde62bfSChris Mason */ 303709cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 30387fde62bfSChris Mason return -ENOMEM; 30397fde62bfSChris Mason 30407fde62bfSChris Mason space_args.total_spaces = 0; 30418d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 30427fde62bfSChris Mason if (!dest) 30437fde62bfSChris Mason return -ENOMEM; 30447fde62bfSChris Mason dest_orig = dest; 30457fde62bfSChris Mason 30467fde62bfSChris Mason /* now we have a buffer to copy into */ 3047bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3048bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3049bf5fc093SJosef Bacik 305051788b1bSDan Rosenberg if (!slot_count) 305151788b1bSDan Rosenberg break; 305251788b1bSDan Rosenberg 3053bf5fc093SJosef Bacik info = NULL; 305472804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3055bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3056bf5fc093SJosef Bacik info = tmp; 30577fde62bfSChris Mason break; 3058bf5fc093SJosef Bacik } 3059bf5fc093SJosef Bacik } 30607fde62bfSChris Mason 3061bf5fc093SJosef Bacik if (!info) 3062bf5fc093SJosef Bacik continue; 3063bf5fc093SJosef Bacik down_read(&info->groups_sem); 3064bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3065bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3066c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3067c065f5b1SSu Yue &space); 30687fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 30691406e432SJosef Bacik dest++; 30701406e432SJosef Bacik space_args.total_spaces++; 307151788b1bSDan Rosenberg slot_count--; 30721406e432SJosef Bacik } 307351788b1bSDan Rosenberg if (!slot_count) 307451788b1bSDan Rosenberg break; 3075bf5fc093SJosef Bacik } 3076bf5fc093SJosef Bacik up_read(&info->groups_sem); 3077bf5fc093SJosef Bacik } 30781406e432SJosef Bacik 307936523e95SDavid Sterba /* 308036523e95SDavid Sterba * Add global block reserve 308136523e95SDavid Sterba */ 308236523e95SDavid Sterba if (slot_count) { 30830b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 308436523e95SDavid Sterba 308536523e95SDavid Sterba spin_lock(&block_rsv->lock); 308636523e95SDavid Sterba space.total_bytes = block_rsv->size; 308736523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 308836523e95SDavid Sterba spin_unlock(&block_rsv->lock); 308936523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 309036523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 309136523e95SDavid Sterba space_args.total_spaces++; 309236523e95SDavid Sterba } 309336523e95SDavid Sterba 30942eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 30957fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 30967fde62bfSChris Mason 30977fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 30987fde62bfSChris Mason ret = -EFAULT; 30997fde62bfSChris Mason 31007fde62bfSChris Mason kfree(dest_orig); 31017fde62bfSChris Mason out: 31027fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 31031406e432SJosef Bacik ret = -EFAULT; 31041406e432SJosef Bacik 31051406e432SJosef Bacik return ret; 31061406e432SJosef Bacik } 31071406e432SJosef Bacik 31089a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 31099a8c28beSMiao Xie void __user *argp) 311046204592SSage Weil { 311146204592SSage Weil struct btrfs_trans_handle *trans; 311246204592SSage Weil u64 transid; 311346204592SSage Weil 3114d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3115ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3116ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 311798d5dc13STsutomu Itoh return PTR_ERR(trans); 3118ff7c1d33SMiao Xie 3119ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3120ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3121ff7c1d33SMiao Xie goto out; 3122ff7c1d33SMiao Xie } 312346204592SSage Weil transid = trans->transid; 3124fdfbf020SJosef Bacik btrfs_commit_transaction_async(trans); 3125ff7c1d33SMiao Xie out: 312646204592SSage Weil if (argp) 312746204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 312846204592SSage Weil return -EFAULT; 312946204592SSage Weil return 0; 313046204592SSage Weil } 313146204592SSage Weil 31322ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 31339a8c28beSMiao Xie void __user *argp) 313446204592SSage Weil { 313546204592SSage Weil u64 transid; 313646204592SSage Weil 313746204592SSage Weil if (argp) { 313846204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 313946204592SSage Weil return -EFAULT; 314046204592SSage Weil } else { 314146204592SSage Weil transid = 0; /* current trans */ 314246204592SSage Weil } 31432ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 314446204592SSage Weil } 314546204592SSage Weil 3146b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3147475f6387SJan Schmidt { 31480b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3149475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3150b8e95489SMiao Xie int ret; 3151475f6387SJan Schmidt 3152475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3153475f6387SJan Schmidt return -EPERM; 3154475f6387SJan Schmidt 3155da32c6d5SJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 3156da32c6d5SJosef Bacik btrfs_err(fs_info, "scrub is not supported on extent tree v2 yet"); 3157da32c6d5SJosef Bacik return -EINVAL; 3158da32c6d5SJosef Bacik } 3159da32c6d5SJosef Bacik 3160475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3161475f6387SJan Schmidt if (IS_ERR(sa)) 3162475f6387SJan Schmidt return PTR_ERR(sa); 3163475f6387SJan Schmidt 3164b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3165b8e95489SMiao Xie ret = mnt_want_write_file(file); 3166b8e95489SMiao Xie if (ret) 3167b8e95489SMiao Xie goto out; 3168b8e95489SMiao Xie } 3169b8e95489SMiao Xie 31700b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 317163a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 317263a212abSStefan Behrens 0); 3173475f6387SJan Schmidt 31745afe6ce7SFilipe Manana /* 31755afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 31765afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 31775afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 31785afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 31795afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 31805afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 31815afe6ce7SFilipe Manana * previously (btrfs-progs does this). 31825afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 31835afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 31845afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 31855afe6ce7SFilipe Manana */ 31865afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3187475f6387SJan Schmidt ret = -EFAULT; 3188475f6387SJan Schmidt 3189b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3190b8e95489SMiao Xie mnt_drop_write_file(file); 3191b8e95489SMiao Xie out: 3192475f6387SJan Schmidt kfree(sa); 3193475f6387SJan Schmidt return ret; 3194475f6387SJan Schmidt } 3195475f6387SJan Schmidt 31962ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3197475f6387SJan Schmidt { 3198475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3199475f6387SJan Schmidt return -EPERM; 3200475f6387SJan Schmidt 32012ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3202475f6387SJan Schmidt } 3203475f6387SJan Schmidt 32042ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3205475f6387SJan Schmidt void __user *arg) 3206475f6387SJan Schmidt { 3207475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3208475f6387SJan Schmidt int ret; 3209475f6387SJan Schmidt 3210475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3211475f6387SJan Schmidt return -EPERM; 3212475f6387SJan Schmidt 3213475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3214475f6387SJan Schmidt if (IS_ERR(sa)) 3215475f6387SJan Schmidt return PTR_ERR(sa); 3216475f6387SJan Schmidt 32172ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3218475f6387SJan Schmidt 32194fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3220475f6387SJan Schmidt ret = -EFAULT; 3221475f6387SJan Schmidt 3222475f6387SJan Schmidt kfree(sa); 3223475f6387SJan Schmidt return ret; 3224475f6387SJan Schmidt } 3225475f6387SJan Schmidt 32262ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3227b27f7c0cSDavid Sterba void __user *arg) 3228c11d2c23SStefan Behrens { 3229c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3230c11d2c23SStefan Behrens int ret; 3231c11d2c23SStefan Behrens 3232c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3233c11d2c23SStefan Behrens if (IS_ERR(sa)) 3234c11d2c23SStefan Behrens return PTR_ERR(sa); 3235c11d2c23SStefan Behrens 3236b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3237b27f7c0cSDavid Sterba kfree(sa); 3238b27f7c0cSDavid Sterba return -EPERM; 3239b27f7c0cSDavid Sterba } 3240b27f7c0cSDavid Sterba 32412ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3242c11d2c23SStefan Behrens 3243eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3244c11d2c23SStefan Behrens ret = -EFAULT; 3245c11d2c23SStefan Behrens 3246c11d2c23SStefan Behrens kfree(sa); 3247c11d2c23SStefan Behrens return ret; 3248c11d2c23SStefan Behrens } 3249c11d2c23SStefan Behrens 32502ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 32512ff7e61eSJeff Mahoney void __user *arg) 32523f6bcfbdSStefan Behrens { 32533f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 32543f6bcfbdSStefan Behrens int ret; 32553f6bcfbdSStefan Behrens 32563f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 32573f6bcfbdSStefan Behrens return -EPERM; 32583f6bcfbdSStefan Behrens 3259914a519bSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 3260914a519bSJosef Bacik btrfs_err(fs_info, "device replace not supported on extent tree v2 yet"); 3261914a519bSJosef Bacik return -EINVAL; 3262914a519bSJosef Bacik } 3263914a519bSJosef Bacik 32643f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 32653f6bcfbdSStefan Behrens if (IS_ERR(p)) 32663f6bcfbdSStefan Behrens return PTR_ERR(p); 32673f6bcfbdSStefan Behrens 32683f6bcfbdSStefan Behrens switch (p->cmd) { 32693f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3270bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3271adfa97cbSIlya Dryomov ret = -EROFS; 3272adfa97cbSIlya Dryomov goto out; 3273adfa97cbSIlya Dryomov } 3274c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 3275e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 32763f6bcfbdSStefan Behrens } else { 32772ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3278c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 32793f6bcfbdSStefan Behrens } 32803f6bcfbdSStefan Behrens break; 32813f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 32820b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 32833f6bcfbdSStefan Behrens ret = 0; 32843f6bcfbdSStefan Behrens break; 32853f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 328617d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 328797282031SAnand Jain ret = 0; 32883f6bcfbdSStefan Behrens break; 32893f6bcfbdSStefan Behrens default: 32903f6bcfbdSStefan Behrens ret = -EINVAL; 32913f6bcfbdSStefan Behrens break; 32923f6bcfbdSStefan Behrens } 32933f6bcfbdSStefan Behrens 3294d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 32953f6bcfbdSStefan Behrens ret = -EFAULT; 3296adfa97cbSIlya Dryomov out: 32973f6bcfbdSStefan Behrens kfree(p); 32983f6bcfbdSStefan Behrens return ret; 32993f6bcfbdSStefan Behrens } 33003f6bcfbdSStefan Behrens 3301d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3302d7728c96SJan Schmidt { 3303d7728c96SJan Schmidt int ret = 0; 3304d7728c96SJan Schmidt int i; 3305740c3d22SChris Mason u64 rel_ptr; 3306d7728c96SJan Schmidt int size; 3307806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3308d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3309d7728c96SJan Schmidt struct btrfs_path *path; 3310d7728c96SJan Schmidt 331182b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3312d7728c96SJan Schmidt return -EPERM; 3313d7728c96SJan Schmidt 3314d7728c96SJan Schmidt path = btrfs_alloc_path(); 3315d7728c96SJan Schmidt if (!path) { 3316d7728c96SJan Schmidt ret = -ENOMEM; 3317d7728c96SJan Schmidt goto out; 3318d7728c96SJan Schmidt } 3319d7728c96SJan Schmidt 3320d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3321d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3322d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3323d7728c96SJan Schmidt ipa = NULL; 3324d7728c96SJan Schmidt goto out; 3325d7728c96SJan Schmidt } 3326d7728c96SJan Schmidt 3327d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3328d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3329d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3330d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3331d7728c96SJan Schmidt ipath = NULL; 3332d7728c96SJan Schmidt goto out; 3333d7728c96SJan Schmidt } 3334d7728c96SJan Schmidt 3335d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3336d7728c96SJan Schmidt if (ret < 0) 3337d7728c96SJan Schmidt goto out; 3338d7728c96SJan Schmidt 3339d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3340745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3341745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3342740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3343d7728c96SJan Schmidt } 3344d7728c96SJan Schmidt 33458cf96b40SAnand Jain btrfs_free_path(path); 33468cf96b40SAnand Jain path = NULL; 3347718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3348718dc5faSOmar Sandoval ipath->fspath, size); 3349d7728c96SJan Schmidt if (ret) { 3350d7728c96SJan Schmidt ret = -EFAULT; 3351d7728c96SJan Schmidt goto out; 3352d7728c96SJan Schmidt } 3353d7728c96SJan Schmidt 3354d7728c96SJan Schmidt out: 3355d7728c96SJan Schmidt btrfs_free_path(path); 3356d7728c96SJan Schmidt free_ipath(ipath); 3357d7728c96SJan Schmidt kfree(ipa); 3358d7728c96SJan Schmidt 3359d7728c96SJan Schmidt return ret; 3360d7728c96SJan Schmidt } 3361d7728c96SJan Schmidt 33622ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3363d24a67b2SZygo Blaxell void __user *arg, int version) 3364d7728c96SJan Schmidt { 3365d7728c96SJan Schmidt int ret = 0; 3366d7728c96SJan Schmidt int size; 3367d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3368d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3369d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3370d24a67b2SZygo Blaxell bool ignore_offset; 3371d7728c96SJan Schmidt 3372d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3373d7728c96SJan Schmidt return -EPERM; 3374d7728c96SJan Schmidt 3375d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 33767b9ea627SShailendra Verma if (IS_ERR(loi)) 33777b9ea627SShailendra Verma return PTR_ERR(loi); 3378d7728c96SJan Schmidt 3379d24a67b2SZygo Blaxell if (version == 1) { 3380d24a67b2SZygo Blaxell ignore_offset = false; 3381b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 3382d24a67b2SZygo Blaxell } else { 3383d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 3384d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 3385d24a67b2SZygo Blaxell ret = -EINVAL; 3386d24a67b2SZygo Blaxell goto out_loi; 3387d24a67b2SZygo Blaxell } 3388d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 3389d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 3390d24a67b2SZygo Blaxell ret = -EINVAL; 3391d24a67b2SZygo Blaxell goto out_loi; 3392d24a67b2SZygo Blaxell } 3393d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 3394b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 3395d24a67b2SZygo Blaxell } 3396d24a67b2SZygo Blaxell 3397418ffb9eSAnand Jain inodes = init_data_container(size); 3398418ffb9eSAnand Jain if (IS_ERR(inodes)) { 3399418ffb9eSAnand Jain ret = PTR_ERR(inodes); 3400418ffb9eSAnand Jain goto out_loi; 3401418ffb9eSAnand Jain } 3402418ffb9eSAnand Jain 3403d7728c96SJan Schmidt path = btrfs_alloc_path(); 3404d7728c96SJan Schmidt if (!path) { 3405d7728c96SJan Schmidt ret = -ENOMEM; 3406d7728c96SJan Schmidt goto out; 3407d7728c96SJan Schmidt } 34082ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 3409e3059ec0SDavid Sterba inodes, ignore_offset); 3410418ffb9eSAnand Jain btrfs_free_path(path); 3411df031f07SLiu Bo if (ret == -EINVAL) 3412d7728c96SJan Schmidt ret = -ENOENT; 3413d7728c96SJan Schmidt if (ret < 0) 3414d7728c96SJan Schmidt goto out; 3415d7728c96SJan Schmidt 3416718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 3417718dc5faSOmar Sandoval size); 3418d7728c96SJan Schmidt if (ret) 3419d7728c96SJan Schmidt ret = -EFAULT; 3420d7728c96SJan Schmidt 3421d7728c96SJan Schmidt out: 3422f54de068SDavid Sterba kvfree(inodes); 3423d24a67b2SZygo Blaxell out_loi: 3424d7728c96SJan Schmidt kfree(loi); 3425d7728c96SJan Schmidt 3426d7728c96SJan Schmidt return ret; 3427d7728c96SJan Schmidt } 3428d7728c96SJan Schmidt 3429008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 3430c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3431c9e9f97bSIlya Dryomov { 3432c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3433c9e9f97bSIlya Dryomov 3434c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3435c9e9f97bSIlya Dryomov 34363009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 3437837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3438837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3439837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3440a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3441a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3442837d5b6eSIlya Dryomov 3443c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3444c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3445c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 344619a39dceSIlya Dryomov 344719a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 344819a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 344919a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 3450c9e9f97bSIlya Dryomov } 3451c9e9f97bSIlya Dryomov 345243dd529aSDavid Sterba /* 34537fb10ed8SNikolay Borisov * Try to acquire fs_info::balance_mutex as well as set BTRFS_EXLCOP_BALANCE as 34547fb10ed8SNikolay Borisov * required. 34557fb10ed8SNikolay Borisov * 34567fb10ed8SNikolay Borisov * @fs_info: the filesystem 34577fb10ed8SNikolay Borisov * @excl_acquired: ptr to boolean value which is set to false in case balance 34587fb10ed8SNikolay Borisov * is being resumed 34597fb10ed8SNikolay Borisov * 34607fb10ed8SNikolay Borisov * Return 0 on success in which case both fs_info::balance is acquired as well 34617fb10ed8SNikolay Borisov * as exclusive ops are blocked. In case of failure return an error code. 34627fb10ed8SNikolay Borisov */ 34637fb10ed8SNikolay Borisov static int btrfs_try_lock_balance(struct btrfs_fs_info *fs_info, bool *excl_acquired) 34647fb10ed8SNikolay Borisov { 34657fb10ed8SNikolay Borisov int ret; 34667fb10ed8SNikolay Borisov 34677fb10ed8SNikolay Borisov /* 34687fb10ed8SNikolay Borisov * Exclusive operation is locked. Three possibilities: 34697fb10ed8SNikolay Borisov * (1) some other op is running 34707fb10ed8SNikolay Borisov * (2) balance is running 34717fb10ed8SNikolay Borisov * (3) balance is paused -- special case (think resume) 34727fb10ed8SNikolay Borisov */ 34737fb10ed8SNikolay Borisov while (1) { 34747fb10ed8SNikolay Borisov if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 34757fb10ed8SNikolay Borisov *excl_acquired = true; 34767fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 34777fb10ed8SNikolay Borisov return 0; 34787fb10ed8SNikolay Borisov } 34797fb10ed8SNikolay Borisov 34807fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 34817fb10ed8SNikolay Borisov if (fs_info->balance_ctl) { 34827fb10ed8SNikolay Borisov /* This is either (2) or (3) */ 34837fb10ed8SNikolay Borisov if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 34847fb10ed8SNikolay Borisov /* This is (2) */ 34857fb10ed8SNikolay Borisov ret = -EINPROGRESS; 34867fb10ed8SNikolay Borisov goto out_failure; 34877fb10ed8SNikolay Borisov 34887fb10ed8SNikolay Borisov } else { 34897fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 34907fb10ed8SNikolay Borisov /* 34917fb10ed8SNikolay Borisov * Lock released to allow other waiters to 34927fb10ed8SNikolay Borisov * continue, we'll reexamine the status again. 34937fb10ed8SNikolay Borisov */ 34947fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 34957fb10ed8SNikolay Borisov 34967fb10ed8SNikolay Borisov if (fs_info->balance_ctl && 34977fb10ed8SNikolay Borisov !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 34987fb10ed8SNikolay Borisov /* This is (3) */ 34997fb10ed8SNikolay Borisov *excl_acquired = false; 35007fb10ed8SNikolay Borisov return 0; 35017fb10ed8SNikolay Borisov } 35027fb10ed8SNikolay Borisov } 35037fb10ed8SNikolay Borisov } else { 35047fb10ed8SNikolay Borisov /* This is (1) */ 35057fb10ed8SNikolay Borisov ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 35067fb10ed8SNikolay Borisov goto out_failure; 35077fb10ed8SNikolay Borisov } 35087fb10ed8SNikolay Borisov 35097fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 35107fb10ed8SNikolay Borisov } 35117fb10ed8SNikolay Borisov 35127fb10ed8SNikolay Borisov out_failure: 35137fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 35147fb10ed8SNikolay Borisov *excl_acquired = false; 35157fb10ed8SNikolay Borisov return ret; 35167fb10ed8SNikolay Borisov } 35177fb10ed8SNikolay Borisov 35189ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3519c9e9f97bSIlya Dryomov { 3520496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3521c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3522c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3523c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3524099aa972SNikolay Borisov bool need_unlock = true; 3525c9e9f97bSIlya Dryomov int ret; 3526c9e9f97bSIlya Dryomov 3527c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3528c9e9f97bSIlya Dryomov return -EPERM; 3529c9e9f97bSIlya Dryomov 3530e54bfa31SLiu Bo ret = mnt_want_write_file(file); 35319ba1f6e4SLiu Bo if (ret) 35329ba1f6e4SLiu Bo return ret; 35339ba1f6e4SLiu Bo 3534d8645462SNikolay Borisov bargs = memdup_user(arg, sizeof(*bargs)); 3535d8645462SNikolay Borisov if (IS_ERR(bargs)) { 3536d8645462SNikolay Borisov ret = PTR_ERR(bargs); 3537d8645462SNikolay Borisov bargs = NULL; 3538d8645462SNikolay Borisov goto out; 3539d8645462SNikolay Borisov } 3540d8645462SNikolay Borisov 3541099aa972SNikolay Borisov ret = btrfs_try_lock_balance(fs_info, &need_unlock); 3542099aa972SNikolay Borisov if (ret) 3543ed0fb78fSIlya Dryomov goto out; 3544ed0fb78fSIlya Dryomov 3545099aa972SNikolay Borisov lockdep_assert_held(&fs_info->balance_mutex); 3546099aa972SNikolay Borisov 3547de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3548de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3549de322263SIlya Dryomov ret = -ENOTCONN; 3550d8645462SNikolay Borisov goto out_unlock; 3551de322263SIlya Dryomov } 3552de322263SIlya Dryomov 3553de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3554de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3555de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3556de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3557efc0e69cSNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE); 3558de322263SIlya Dryomov 3559de322263SIlya Dryomov goto do_balance; 3560de322263SIlya Dryomov } 3561c9e9f97bSIlya Dryomov 3562d8645462SNikolay Borisov if (bargs->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 3563d8645462SNikolay Borisov ret = -EINVAL; 3564d8645462SNikolay Borisov goto out_unlock; 3565c9e9f97bSIlya Dryomov } 3566c9e9f97bSIlya Dryomov 3567ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3568837d5b6eSIlya Dryomov ret = -EINPROGRESS; 3569d8645462SNikolay Borisov goto out_unlock; 3570837d5b6eSIlya Dryomov } 3571837d5b6eSIlya Dryomov 35728d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 3573c9e9f97bSIlya Dryomov if (!bctl) { 3574c9e9f97bSIlya Dryomov ret = -ENOMEM; 3575d8645462SNikolay Borisov goto out_unlock; 3576c9e9f97bSIlya Dryomov } 3577c9e9f97bSIlya Dryomov 3578c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 3579c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 3580c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 3581c9e9f97bSIlya Dryomov 3582c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 3583de322263SIlya Dryomov do_balance: 3584c9e9f97bSIlya Dryomov /* 3585c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 3586c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 3587c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 3588c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 3589c9e9f97bSIlya Dryomov */ 3590ed0fb78fSIlya Dryomov need_unlock = false; 3591ed0fb78fSIlya Dryomov 35926fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 35930f89abf5SChristian Engelmayer bctl = NULL; 3594ed0fb78fSIlya Dryomov 359539864601SNikolay Borisov if (ret == 0 || ret == -ECANCELED) { 3596c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 3597c9e9f97bSIlya Dryomov ret = -EFAULT; 3598c9e9f97bSIlya Dryomov } 3599c9e9f97bSIlya Dryomov 36000f89abf5SChristian Engelmayer kfree(bctl); 3601ed0fb78fSIlya Dryomov out_unlock: 3602c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3603ed0fb78fSIlya Dryomov if (need_unlock) 3604c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3605ed0fb78fSIlya Dryomov out: 3606e54bfa31SLiu Bo mnt_drop_write_file(file); 3607d8645462SNikolay Borisov kfree(bargs); 3608c9e9f97bSIlya Dryomov return ret; 3609c9e9f97bSIlya Dryomov } 3610c9e9f97bSIlya Dryomov 36112ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 3612837d5b6eSIlya Dryomov { 3613837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3614837d5b6eSIlya Dryomov return -EPERM; 3615837d5b6eSIlya Dryomov 3616837d5b6eSIlya Dryomov switch (cmd) { 3617837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 36180b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 3619a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 36200b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 3621837d5b6eSIlya Dryomov } 3622837d5b6eSIlya Dryomov 3623837d5b6eSIlya Dryomov return -EINVAL; 3624837d5b6eSIlya Dryomov } 3625837d5b6eSIlya Dryomov 36262ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 362719a39dceSIlya Dryomov void __user *arg) 362819a39dceSIlya Dryomov { 362919a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 363019a39dceSIlya Dryomov int ret = 0; 363119a39dceSIlya Dryomov 363219a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 363319a39dceSIlya Dryomov return -EPERM; 363419a39dceSIlya Dryomov 363519a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 363619a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 363719a39dceSIlya Dryomov ret = -ENOTCONN; 363819a39dceSIlya Dryomov goto out; 363919a39dceSIlya Dryomov } 364019a39dceSIlya Dryomov 36418d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 364219a39dceSIlya Dryomov if (!bargs) { 364319a39dceSIlya Dryomov ret = -ENOMEM; 364419a39dceSIlya Dryomov goto out; 364519a39dceSIlya Dryomov } 364619a39dceSIlya Dryomov 3647008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 364819a39dceSIlya Dryomov 364919a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 365019a39dceSIlya Dryomov ret = -EFAULT; 365119a39dceSIlya Dryomov 365219a39dceSIlya Dryomov kfree(bargs); 365319a39dceSIlya Dryomov out: 365419a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 365519a39dceSIlya Dryomov return ret; 365619a39dceSIlya Dryomov } 365719a39dceSIlya Dryomov 3658905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 36595d13a37bSArne Jansen { 36600b246afaSJeff Mahoney struct inode *inode = file_inode(file); 36610b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 36625d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 36635d13a37bSArne Jansen int ret; 36645d13a37bSArne Jansen 36655d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 36665d13a37bSArne Jansen return -EPERM; 36675d13a37bSArne Jansen 3668905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3669905b0ddaSMiao Xie if (ret) 3670905b0ddaSMiao Xie return ret; 36715d13a37bSArne Jansen 36725d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3673905b0ddaSMiao Xie if (IS_ERR(sa)) { 3674905b0ddaSMiao Xie ret = PTR_ERR(sa); 3675905b0ddaSMiao Xie goto drop_write; 3676905b0ddaSMiao Xie } 36775d13a37bSArne Jansen 36780b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 36795d13a37bSArne Jansen 36805d13a37bSArne Jansen switch (sa->cmd) { 36815d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 3682340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 36835d13a37bSArne Jansen break; 36845d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 3685340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 36865d13a37bSArne Jansen break; 36875d13a37bSArne Jansen default: 36885d13a37bSArne Jansen ret = -EINVAL; 36895d13a37bSArne Jansen break; 36905d13a37bSArne Jansen } 36915d13a37bSArne Jansen 36925d13a37bSArne Jansen kfree(sa); 36930b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 3694905b0ddaSMiao Xie drop_write: 3695905b0ddaSMiao Xie mnt_drop_write_file(file); 36965d13a37bSArne Jansen return ret; 36975d13a37bSArne Jansen } 36985d13a37bSArne Jansen 3699905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 37005d13a37bSArne Jansen { 37010b246afaSJeff Mahoney struct inode *inode = file_inode(file); 37020b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 37030b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 37045d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 37055d13a37bSArne Jansen struct btrfs_trans_handle *trans; 37065d13a37bSArne Jansen int ret; 37075d13a37bSArne Jansen int err; 37085d13a37bSArne Jansen 37095d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 37105d13a37bSArne Jansen return -EPERM; 37115d13a37bSArne Jansen 3712905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3713905b0ddaSMiao Xie if (ret) 3714905b0ddaSMiao Xie return ret; 37155d13a37bSArne Jansen 37165d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3717905b0ddaSMiao Xie if (IS_ERR(sa)) { 3718905b0ddaSMiao Xie ret = PTR_ERR(sa); 3719905b0ddaSMiao Xie goto drop_write; 3720905b0ddaSMiao Xie } 37215d13a37bSArne Jansen 37225d13a37bSArne Jansen trans = btrfs_join_transaction(root); 37235d13a37bSArne Jansen if (IS_ERR(trans)) { 37245d13a37bSArne Jansen ret = PTR_ERR(trans); 37255d13a37bSArne Jansen goto out; 37265d13a37bSArne Jansen } 37275d13a37bSArne Jansen 37285d13a37bSArne Jansen if (sa->assign) { 37299f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 37305d13a37bSArne Jansen } else { 373139616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 37325d13a37bSArne Jansen } 37335d13a37bSArne Jansen 3734e082f563SQu Wenruo /* update qgroup status and info */ 3735280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 3736e082f563SQu Wenruo if (err < 0) 37370b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 3738ad8403dfSAnand Jain "failed to update qgroup status and info"); 37393a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 37405d13a37bSArne Jansen if (err && !ret) 37415d13a37bSArne Jansen ret = err; 37425d13a37bSArne Jansen 37435d13a37bSArne Jansen out: 37445d13a37bSArne Jansen kfree(sa); 3745905b0ddaSMiao Xie drop_write: 3746905b0ddaSMiao Xie mnt_drop_write_file(file); 37475d13a37bSArne Jansen return ret; 37485d13a37bSArne Jansen } 37495d13a37bSArne Jansen 3750905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 37515d13a37bSArne Jansen { 37520b246afaSJeff Mahoney struct inode *inode = file_inode(file); 37530b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 37545d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 37555d13a37bSArne Jansen struct btrfs_trans_handle *trans; 37565d13a37bSArne Jansen int ret; 37575d13a37bSArne Jansen int err; 37585d13a37bSArne Jansen 37595d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 37605d13a37bSArne Jansen return -EPERM; 37615d13a37bSArne Jansen 3762905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3763905b0ddaSMiao Xie if (ret) 3764905b0ddaSMiao Xie return ret; 37655d13a37bSArne Jansen 37665d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3767905b0ddaSMiao Xie if (IS_ERR(sa)) { 3768905b0ddaSMiao Xie ret = PTR_ERR(sa); 3769905b0ddaSMiao Xie goto drop_write; 3770905b0ddaSMiao Xie } 37715d13a37bSArne Jansen 3772d86e56cfSMiao Xie if (!sa->qgroupid) { 3773d86e56cfSMiao Xie ret = -EINVAL; 3774d86e56cfSMiao Xie goto out; 3775d86e56cfSMiao Xie } 3776d86e56cfSMiao Xie 37775d13a37bSArne Jansen trans = btrfs_join_transaction(root); 37785d13a37bSArne Jansen if (IS_ERR(trans)) { 37795d13a37bSArne Jansen ret = PTR_ERR(trans); 37805d13a37bSArne Jansen goto out; 37815d13a37bSArne Jansen } 37825d13a37bSArne Jansen 37835d13a37bSArne Jansen if (sa->create) { 378449a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 37855d13a37bSArne Jansen } else { 37863efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 37875d13a37bSArne Jansen } 37885d13a37bSArne Jansen 37893a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 37905d13a37bSArne Jansen if (err && !ret) 37915d13a37bSArne Jansen ret = err; 37925d13a37bSArne Jansen 37935d13a37bSArne Jansen out: 37945d13a37bSArne Jansen kfree(sa); 3795905b0ddaSMiao Xie drop_write: 3796905b0ddaSMiao Xie mnt_drop_write_file(file); 37975d13a37bSArne Jansen return ret; 37985d13a37bSArne Jansen } 37995d13a37bSArne Jansen 3800905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 38015d13a37bSArne Jansen { 38020b246afaSJeff Mahoney struct inode *inode = file_inode(file); 38030b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 38045d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 38055d13a37bSArne Jansen struct btrfs_trans_handle *trans; 38065d13a37bSArne Jansen int ret; 38075d13a37bSArne Jansen int err; 38085d13a37bSArne Jansen u64 qgroupid; 38095d13a37bSArne Jansen 38105d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 38115d13a37bSArne Jansen return -EPERM; 38125d13a37bSArne Jansen 3813905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3814905b0ddaSMiao Xie if (ret) 3815905b0ddaSMiao Xie return ret; 38165d13a37bSArne Jansen 38175d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3818905b0ddaSMiao Xie if (IS_ERR(sa)) { 3819905b0ddaSMiao Xie ret = PTR_ERR(sa); 3820905b0ddaSMiao Xie goto drop_write; 3821905b0ddaSMiao Xie } 38225d13a37bSArne Jansen 38235d13a37bSArne Jansen trans = btrfs_join_transaction(root); 38245d13a37bSArne Jansen if (IS_ERR(trans)) { 38255d13a37bSArne Jansen ret = PTR_ERR(trans); 38265d13a37bSArne Jansen goto out; 38275d13a37bSArne Jansen } 38285d13a37bSArne Jansen 38295d13a37bSArne Jansen qgroupid = sa->qgroupid; 38305d13a37bSArne Jansen if (!qgroupid) { 38315d13a37bSArne Jansen /* take the current subvol as qgroup */ 38325d13a37bSArne Jansen qgroupid = root->root_key.objectid; 38335d13a37bSArne Jansen } 38345d13a37bSArne Jansen 3835f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 38365d13a37bSArne Jansen 38373a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 38385d13a37bSArne Jansen if (err && !ret) 38395d13a37bSArne Jansen ret = err; 38405d13a37bSArne Jansen 38415d13a37bSArne Jansen out: 38425d13a37bSArne Jansen kfree(sa); 3843905b0ddaSMiao Xie drop_write: 3844905b0ddaSMiao Xie mnt_drop_write_file(file); 38455d13a37bSArne Jansen return ret; 38465d13a37bSArne Jansen } 38475d13a37bSArne Jansen 38482f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 38492f232036SJan Schmidt { 38500b246afaSJeff Mahoney struct inode *inode = file_inode(file); 38510b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 38522f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 38532f232036SJan Schmidt int ret; 38542f232036SJan Schmidt 38552f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 38562f232036SJan Schmidt return -EPERM; 38572f232036SJan Schmidt 38582f232036SJan Schmidt ret = mnt_want_write_file(file); 38592f232036SJan Schmidt if (ret) 38602f232036SJan Schmidt return ret; 38612f232036SJan Schmidt 38622f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 38632f232036SJan Schmidt if (IS_ERR(qsa)) { 38642f232036SJan Schmidt ret = PTR_ERR(qsa); 38652f232036SJan Schmidt goto drop_write; 38662f232036SJan Schmidt } 38672f232036SJan Schmidt 38682f232036SJan Schmidt if (qsa->flags) { 38692f232036SJan Schmidt ret = -EINVAL; 38702f232036SJan Schmidt goto out; 38712f232036SJan Schmidt } 38722f232036SJan Schmidt 38730b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 38742f232036SJan Schmidt 38752f232036SJan Schmidt out: 38762f232036SJan Schmidt kfree(qsa); 38772f232036SJan Schmidt drop_write: 38782f232036SJan Schmidt mnt_drop_write_file(file); 38792f232036SJan Schmidt return ret; 38802f232036SJan Schmidt } 38812f232036SJan Schmidt 3882b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 3883b929c1d8SMarcos Paulo de Souza void __user *arg) 38842f232036SJan Schmidt { 38850afb603aSGoldwyn Rodrigues struct btrfs_ioctl_quota_rescan_args qsa = {0}; 38862f232036SJan Schmidt 38872f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 38882f232036SJan Schmidt return -EPERM; 38892f232036SJan Schmidt 38900b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 38910afb603aSGoldwyn Rodrigues qsa.flags = 1; 38920afb603aSGoldwyn Rodrigues qsa.progress = fs_info->qgroup_rescan_progress.objectid; 38932f232036SJan Schmidt } 38942f232036SJan Schmidt 38950afb603aSGoldwyn Rodrigues if (copy_to_user(arg, &qsa, sizeof(qsa))) 3896991a3daeSAnand Jain return -EFAULT; 38972f232036SJan Schmidt 3898991a3daeSAnand Jain return 0; 38992f232036SJan Schmidt } 39002f232036SJan Schmidt 3901b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 3902b929c1d8SMarcos Paulo de Souza void __user *arg) 390357254b6eSJan Schmidt { 390457254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 390557254b6eSJan Schmidt return -EPERM; 390657254b6eSJan Schmidt 39070b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 390857254b6eSJan Schmidt } 390957254b6eSJan Schmidt 3910abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 3911e4fed17aSChristian Brauner struct user_namespace *mnt_userns, 3912abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 39138ea05e3aSAlexander Block { 3914496ad9aaSAl Viro struct inode *inode = file_inode(file); 39150b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 39168ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 39178ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 39188ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 391995582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 39208ea05e3aSAlexander Block int ret = 0; 3921dd5f9615SStefan Behrens int received_uuid_changed; 39228ea05e3aSAlexander Block 3923e4fed17aSChristian Brauner if (!inode_owner_or_capable(mnt_userns, inode)) 3924bd60ea0fSDavid Sterba return -EPERM; 3925bd60ea0fSDavid Sterba 39268ea05e3aSAlexander Block ret = mnt_want_write_file(file); 39278ea05e3aSAlexander Block if (ret < 0) 39288ea05e3aSAlexander Block return ret; 39298ea05e3aSAlexander Block 39300b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 39318ea05e3aSAlexander Block 39324a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 39338ea05e3aSAlexander Block ret = -EINVAL; 39348ea05e3aSAlexander Block goto out; 39358ea05e3aSAlexander Block } 39368ea05e3aSAlexander Block 39378ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 39388ea05e3aSAlexander Block ret = -EROFS; 39398ea05e3aSAlexander Block goto out; 39408ea05e3aSAlexander Block } 39418ea05e3aSAlexander Block 3942dd5f9615SStefan Behrens /* 3943dd5f9615SStefan Behrens * 1 - root item 3944dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 3945dd5f9615SStefan Behrens */ 3946dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 39478ea05e3aSAlexander Block if (IS_ERR(trans)) { 39488ea05e3aSAlexander Block ret = PTR_ERR(trans); 39498ea05e3aSAlexander Block trans = NULL; 39508ea05e3aSAlexander Block goto out; 39518ea05e3aSAlexander Block } 39528ea05e3aSAlexander Block 39538ea05e3aSAlexander Block sa->rtransid = trans->transid; 39548ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 39558ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 39568ea05e3aSAlexander Block 3957dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 3958dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 3959dd5f9615SStefan Behrens if (received_uuid_changed && 3960d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 3961d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 3962dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 3963dd5f9615SStefan Behrens root->root_key.objectid); 3964d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 3965d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 3966d87ff758SNikolay Borisov btrfs_end_transaction(trans); 3967d87ff758SNikolay Borisov goto out; 3968d87ff758SNikolay Borisov } 3969d87ff758SNikolay Borisov } 39708ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 39718ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 39728ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 39733cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 39743cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 39753cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 39763cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 39778ea05e3aSAlexander Block 39780b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 39798ea05e3aSAlexander Block &root->root_key, &root->root_item); 39808ea05e3aSAlexander Block if (ret < 0) { 39813a45bb20SJeff Mahoney btrfs_end_transaction(trans); 39828ea05e3aSAlexander Block goto out; 3983dd5f9615SStefan Behrens } 3984dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 3985cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 3986dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 3987dd5f9615SStefan Behrens root->root_key.objectid); 3988dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 398966642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 3990efd38150SNikolay Borisov btrfs_end_transaction(trans); 3991dd5f9615SStefan Behrens goto out; 3992dd5f9615SStefan Behrens } 3993dd5f9615SStefan Behrens } 39943a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 3995abccd00fSHugo Mills out: 39960b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 3997abccd00fSHugo Mills mnt_drop_write_file(file); 3998abccd00fSHugo Mills return ret; 3999abccd00fSHugo Mills } 4000abccd00fSHugo Mills 4001abccd00fSHugo Mills #ifdef CONFIG_64BIT 4002abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4003abccd00fSHugo Mills void __user *arg) 4004abccd00fSHugo Mills { 4005abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4006abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4007abccd00fSHugo Mills int ret = 0; 4008abccd00fSHugo Mills 4009abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 40107b9ea627SShailendra Verma if (IS_ERR(args32)) 40117b9ea627SShailendra Verma return PTR_ERR(args32); 4012abccd00fSHugo Mills 40138d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 401484dbeb87SDan Carpenter if (!args64) { 401584dbeb87SDan Carpenter ret = -ENOMEM; 4016abccd00fSHugo Mills goto out; 4017abccd00fSHugo Mills } 4018abccd00fSHugo Mills 4019abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4020abccd00fSHugo Mills args64->stransid = args32->stransid; 4021abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4022abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4023abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4024abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4025abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4026abccd00fSHugo Mills args64->flags = args32->flags; 4027abccd00fSHugo Mills 4028e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), args64); 4029abccd00fSHugo Mills if (ret) 4030abccd00fSHugo Mills goto out; 4031abccd00fSHugo Mills 4032abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4033abccd00fSHugo Mills args32->stransid = args64->stransid; 4034abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4035abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4036abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4037abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4038abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4039abccd00fSHugo Mills args32->flags = args64->flags; 4040abccd00fSHugo Mills 4041abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4042abccd00fSHugo Mills if (ret) 4043abccd00fSHugo Mills ret = -EFAULT; 4044abccd00fSHugo Mills 4045abccd00fSHugo Mills out: 4046abccd00fSHugo Mills kfree(args32); 4047abccd00fSHugo Mills kfree(args64); 4048abccd00fSHugo Mills return ret; 4049abccd00fSHugo Mills } 4050abccd00fSHugo Mills #endif 4051abccd00fSHugo Mills 4052abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4053abccd00fSHugo Mills void __user *arg) 4054abccd00fSHugo Mills { 4055abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4056abccd00fSHugo Mills int ret = 0; 4057abccd00fSHugo Mills 4058abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 40597b9ea627SShailendra Verma if (IS_ERR(sa)) 40607b9ea627SShailendra Verma return PTR_ERR(sa); 4061abccd00fSHugo Mills 4062e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), sa); 4063abccd00fSHugo Mills 4064abccd00fSHugo Mills if (ret) 4065abccd00fSHugo Mills goto out; 4066abccd00fSHugo Mills 40678ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 40688ea05e3aSAlexander Block if (ret) 40698ea05e3aSAlexander Block ret = -EFAULT; 40708ea05e3aSAlexander Block 40718ea05e3aSAlexander Block out: 40728ea05e3aSAlexander Block kfree(sa); 40738ea05e3aSAlexander Block return ret; 40748ea05e3aSAlexander Block } 40758ea05e3aSAlexander Block 4076b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4077b929c1d8SMarcos Paulo de Souza void __user *arg) 4078867ab667Sjeff.liu { 4079a1b83ac5SAnand Jain size_t len; 4080867ab667Sjeff.liu int ret; 4081a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4082a1b83ac5SAnand Jain 40830b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 40840b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 40850b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4086a1b83ac5SAnand Jain 4087a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4088867ab667Sjeff.liu 4089867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 40900b246afaSJeff Mahoney btrfs_warn(fs_info, 40910b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 40920b246afaSJeff Mahoney --len); 4093867ab667Sjeff.liu } 4094867ab667Sjeff.liu 4095867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4096867ab667Sjeff.liu 4097867ab667Sjeff.liu return ret ? -EFAULT : 0; 4098867ab667Sjeff.liu } 4099867ab667Sjeff.liu 4100a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4101a8bfd4abSjeff.liu { 41020b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41030b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41040b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 41050b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4106a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4107a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4108a8bfd4abSjeff.liu int ret; 4109a8bfd4abSjeff.liu 4110a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4111a8bfd4abSjeff.liu return -EPERM; 4112a8bfd4abSjeff.liu 4113a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4114a8bfd4abSjeff.liu return -EFAULT; 4115a8bfd4abSjeff.liu 4116a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 41170b246afaSJeff Mahoney btrfs_err(fs_info, 41185d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4119a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4120a8bfd4abSjeff.liu return -EINVAL; 4121a8bfd4abSjeff.liu } 4122a8bfd4abSjeff.liu 4123a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4124a8bfd4abSjeff.liu if (ret) 4125a8bfd4abSjeff.liu return ret; 4126a8bfd4abSjeff.liu 4127a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4128a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4129a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4130a8bfd4abSjeff.liu goto out_unlock; 4131a8bfd4abSjeff.liu } 4132a8bfd4abSjeff.liu 41330b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4134a8bfd4abSjeff.liu strcpy(super_block->label, label); 41350b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 41363a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4137a8bfd4abSjeff.liu 4138a8bfd4abSjeff.liu out_unlock: 4139a8bfd4abSjeff.liu mnt_drop_write_file(file); 4140a8bfd4abSjeff.liu return ret; 4141a8bfd4abSjeff.liu } 4142a8bfd4abSjeff.liu 41432eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 41442eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 41452eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 41462eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 41472eaa055fSJeff Mahoney 4148d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 41492eaa055fSJeff Mahoney { 41504d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 41512eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 41522eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 41532eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 41542eaa055fSJeff Mahoney }; 41552eaa055fSJeff Mahoney 41562eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 41572eaa055fSJeff Mahoney return -EFAULT; 41582eaa055fSJeff Mahoney 41592eaa055fSJeff Mahoney return 0; 41602eaa055fSJeff Mahoney } 41612eaa055fSJeff Mahoney 4162b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4163b929c1d8SMarcos Paulo de Souza void __user *arg) 41642eaa055fSJeff Mahoney { 41650b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 41662eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 41672eaa055fSJeff Mahoney 41682eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 41692eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 41702eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 41712eaa055fSJeff Mahoney 41722eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 41732eaa055fSJeff Mahoney return -EFAULT; 41742eaa055fSJeff Mahoney 41752eaa055fSJeff Mahoney return 0; 41762eaa055fSJeff Mahoney } 41772eaa055fSJeff Mahoney 41782ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 41793b02a68aSJeff Mahoney enum btrfs_feature_set set, 41802eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 41812eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 41822eaa055fSJeff Mahoney { 4183f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 41843b02a68aSJeff Mahoney char *names; 41852eaa055fSJeff Mahoney u64 disallowed, unsupported; 41862eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 41872eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 41882eaa055fSJeff Mahoney 41892eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 41902eaa055fSJeff Mahoney if (unsupported) { 41913b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 41923b02a68aSJeff Mahoney if (names) { 41930b246afaSJeff Mahoney btrfs_warn(fs_info, 41943b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 41953b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 41963b02a68aSJeff Mahoney kfree(names); 41973b02a68aSJeff Mahoney } else 41980b246afaSJeff Mahoney btrfs_warn(fs_info, 41992eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 42002eaa055fSJeff Mahoney type, unsupported); 42012eaa055fSJeff Mahoney return -EOPNOTSUPP; 42022eaa055fSJeff Mahoney } 42032eaa055fSJeff Mahoney 42042eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 42052eaa055fSJeff Mahoney if (disallowed) { 42063b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 42073b02a68aSJeff Mahoney if (names) { 42080b246afaSJeff Mahoney btrfs_warn(fs_info, 42093b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 42103b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 42113b02a68aSJeff Mahoney kfree(names); 42123b02a68aSJeff Mahoney } else 42130b246afaSJeff Mahoney btrfs_warn(fs_info, 42142eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 42152eaa055fSJeff Mahoney type, disallowed); 42162eaa055fSJeff Mahoney return -EPERM; 42172eaa055fSJeff Mahoney } 42182eaa055fSJeff Mahoney 42192eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 42202eaa055fSJeff Mahoney if (disallowed) { 42213b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 42223b02a68aSJeff Mahoney if (names) { 42230b246afaSJeff Mahoney btrfs_warn(fs_info, 42243b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 42253b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 42263b02a68aSJeff Mahoney kfree(names); 42273b02a68aSJeff Mahoney } else 42280b246afaSJeff Mahoney btrfs_warn(fs_info, 42292eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 42302eaa055fSJeff Mahoney type, disallowed); 42312eaa055fSJeff Mahoney return -EPERM; 42322eaa055fSJeff Mahoney } 42332eaa055fSJeff Mahoney 42342eaa055fSJeff Mahoney return 0; 42352eaa055fSJeff Mahoney } 42362eaa055fSJeff Mahoney 42372ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 42382ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 42392eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 42402eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 42412eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 42422eaa055fSJeff Mahoney 42432eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 42442eaa055fSJeff Mahoney { 42450b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42460b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42470b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42480b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 42492eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 42502eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 42512eaa055fSJeff Mahoney u64 newflags; 42522eaa055fSJeff Mahoney int ret; 42532eaa055fSJeff Mahoney 42542eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 42552eaa055fSJeff Mahoney return -EPERM; 42562eaa055fSJeff Mahoney 42572eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 42582eaa055fSJeff Mahoney return -EFAULT; 42592eaa055fSJeff Mahoney 42602eaa055fSJeff Mahoney /* Nothing to do */ 42612eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 42622eaa055fSJeff Mahoney !flags[0].incompat_flags) 42632eaa055fSJeff Mahoney return 0; 42642eaa055fSJeff Mahoney 42652ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 42662eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 42672eaa055fSJeff Mahoney if (ret) 42682eaa055fSJeff Mahoney return ret; 42692eaa055fSJeff Mahoney 42702ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 42712eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 42722eaa055fSJeff Mahoney if (ret) 42732eaa055fSJeff Mahoney return ret; 42742eaa055fSJeff Mahoney 42752ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 42762eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 42772eaa055fSJeff Mahoney if (ret) 42782eaa055fSJeff Mahoney return ret; 42792eaa055fSJeff Mahoney 42807ab19625SDavid Sterba ret = mnt_want_write_file(file); 42817ab19625SDavid Sterba if (ret) 42827ab19625SDavid Sterba return ret; 42837ab19625SDavid Sterba 42848051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 42857ab19625SDavid Sterba if (IS_ERR(trans)) { 42867ab19625SDavid Sterba ret = PTR_ERR(trans); 42877ab19625SDavid Sterba goto out_drop_write; 42887ab19625SDavid Sterba } 42892eaa055fSJeff Mahoney 42900b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 42912eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 42922eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 42932eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 42942eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 42952eaa055fSJeff Mahoney 42962eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 42972eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 42982eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 42992eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 43002eaa055fSJeff Mahoney 43012eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 43022eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 43032eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 43042eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 43050b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 43062eaa055fSJeff Mahoney 43073a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 43087ab19625SDavid Sterba out_drop_write: 43097ab19625SDavid Sterba mnt_drop_write_file(file); 43107ab19625SDavid Sterba 43117ab19625SDavid Sterba return ret; 43122eaa055fSJeff Mahoney } 43132eaa055fSJeff Mahoney 43149ad12305SSahil Kang static int _btrfs_ioctl_send(struct inode *inode, void __user *argp, bool compat) 43152351f431SJosef Bacik { 43162351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 43172351f431SJosef Bacik int ret; 43182351f431SJosef Bacik 43192351f431SJosef Bacik if (compat) { 43202351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 43212351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 43222351f431SJosef Bacik 43232351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 43242351f431SJosef Bacik if (ret) 43252351f431SJosef Bacik return -EFAULT; 43262351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 43272351f431SJosef Bacik if (!arg) 43282351f431SJosef Bacik return -ENOMEM; 43292351f431SJosef Bacik arg->send_fd = args32.send_fd; 43302351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 43312351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 43322351f431SJosef Bacik arg->parent_root = args32.parent_root; 43332351f431SJosef Bacik arg->flags = args32.flags; 43342351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 43352351f431SJosef Bacik sizeof(args32.reserved)); 43362351f431SJosef Bacik #else 43372351f431SJosef Bacik return -ENOTTY; 43382351f431SJosef Bacik #endif 43392351f431SJosef Bacik } else { 43402351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 43412351f431SJosef Bacik if (IS_ERR(arg)) 43422351f431SJosef Bacik return PTR_ERR(arg); 43432351f431SJosef Bacik } 43449ad12305SSahil Kang ret = btrfs_ioctl_send(inode, arg); 43452351f431SJosef Bacik kfree(arg); 43462351f431SJosef Bacik return ret; 43472351f431SJosef Bacik } 43482351f431SJosef Bacik 43491881fba8SOmar Sandoval static int btrfs_ioctl_encoded_read(struct file *file, void __user *argp, 43501881fba8SOmar Sandoval bool compat) 43511881fba8SOmar Sandoval { 43521881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args args = { 0 }; 43531881fba8SOmar Sandoval size_t copy_end_kernel = offsetofend(struct btrfs_ioctl_encoded_io_args, 43541881fba8SOmar Sandoval flags); 43551881fba8SOmar Sandoval size_t copy_end; 43561881fba8SOmar Sandoval struct iovec iovstack[UIO_FASTIOV]; 43571881fba8SOmar Sandoval struct iovec *iov = iovstack; 43581881fba8SOmar Sandoval struct iov_iter iter; 43591881fba8SOmar Sandoval loff_t pos; 43601881fba8SOmar Sandoval struct kiocb kiocb; 43611881fba8SOmar Sandoval ssize_t ret; 43621881fba8SOmar Sandoval 43631881fba8SOmar Sandoval if (!capable(CAP_SYS_ADMIN)) { 43641881fba8SOmar Sandoval ret = -EPERM; 43651881fba8SOmar Sandoval goto out_acct; 43661881fba8SOmar Sandoval } 43671881fba8SOmar Sandoval 43681881fba8SOmar Sandoval if (compat) { 43691881fba8SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 43701881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 args32; 43711881fba8SOmar Sandoval 43721881fba8SOmar Sandoval copy_end = offsetofend(struct btrfs_ioctl_encoded_io_args_32, 43731881fba8SOmar Sandoval flags); 43741881fba8SOmar Sandoval if (copy_from_user(&args32, argp, copy_end)) { 43751881fba8SOmar Sandoval ret = -EFAULT; 43761881fba8SOmar Sandoval goto out_acct; 43771881fba8SOmar Sandoval } 43781881fba8SOmar Sandoval args.iov = compat_ptr(args32.iov); 43791881fba8SOmar Sandoval args.iovcnt = args32.iovcnt; 43801881fba8SOmar Sandoval args.offset = args32.offset; 43811881fba8SOmar Sandoval args.flags = args32.flags; 43821881fba8SOmar Sandoval #else 43831881fba8SOmar Sandoval return -ENOTTY; 43841881fba8SOmar Sandoval #endif 43851881fba8SOmar Sandoval } else { 43861881fba8SOmar Sandoval copy_end = copy_end_kernel; 43871881fba8SOmar Sandoval if (copy_from_user(&args, argp, copy_end)) { 43881881fba8SOmar Sandoval ret = -EFAULT; 43891881fba8SOmar Sandoval goto out_acct; 43901881fba8SOmar Sandoval } 43911881fba8SOmar Sandoval } 43921881fba8SOmar Sandoval if (args.flags != 0) { 43931881fba8SOmar Sandoval ret = -EINVAL; 43941881fba8SOmar Sandoval goto out_acct; 43951881fba8SOmar Sandoval } 43961881fba8SOmar Sandoval 43971881fba8SOmar Sandoval ret = import_iovec(READ, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), 43981881fba8SOmar Sandoval &iov, &iter); 43991881fba8SOmar Sandoval if (ret < 0) 44001881fba8SOmar Sandoval goto out_acct; 44011881fba8SOmar Sandoval 44021881fba8SOmar Sandoval if (iov_iter_count(&iter) == 0) { 44031881fba8SOmar Sandoval ret = 0; 44041881fba8SOmar Sandoval goto out_iov; 44051881fba8SOmar Sandoval } 44061881fba8SOmar Sandoval pos = args.offset; 44071881fba8SOmar Sandoval ret = rw_verify_area(READ, file, &pos, args.len); 44081881fba8SOmar Sandoval if (ret < 0) 44091881fba8SOmar Sandoval goto out_iov; 44101881fba8SOmar Sandoval 44111881fba8SOmar Sandoval init_sync_kiocb(&kiocb, file); 44121881fba8SOmar Sandoval kiocb.ki_pos = pos; 44131881fba8SOmar Sandoval 44141881fba8SOmar Sandoval ret = btrfs_encoded_read(&kiocb, &iter, &args); 44151881fba8SOmar Sandoval if (ret >= 0) { 44161881fba8SOmar Sandoval fsnotify_access(file); 44171881fba8SOmar Sandoval if (copy_to_user(argp + copy_end, 44181881fba8SOmar Sandoval (char *)&args + copy_end_kernel, 44191881fba8SOmar Sandoval sizeof(args) - copy_end_kernel)) 44201881fba8SOmar Sandoval ret = -EFAULT; 44211881fba8SOmar Sandoval } 44221881fba8SOmar Sandoval 44231881fba8SOmar Sandoval out_iov: 44241881fba8SOmar Sandoval kfree(iov); 44251881fba8SOmar Sandoval out_acct: 44261881fba8SOmar Sandoval if (ret > 0) 44271881fba8SOmar Sandoval add_rchar(current, ret); 44281881fba8SOmar Sandoval inc_syscr(current); 44291881fba8SOmar Sandoval return ret; 44301881fba8SOmar Sandoval } 44311881fba8SOmar Sandoval 44327c0c7269SOmar Sandoval static int btrfs_ioctl_encoded_write(struct file *file, void __user *argp, bool compat) 44337c0c7269SOmar Sandoval { 44347c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args args; 44357c0c7269SOmar Sandoval struct iovec iovstack[UIO_FASTIOV]; 44367c0c7269SOmar Sandoval struct iovec *iov = iovstack; 44377c0c7269SOmar Sandoval struct iov_iter iter; 44387c0c7269SOmar Sandoval loff_t pos; 44397c0c7269SOmar Sandoval struct kiocb kiocb; 44407c0c7269SOmar Sandoval ssize_t ret; 44417c0c7269SOmar Sandoval 44427c0c7269SOmar Sandoval if (!capable(CAP_SYS_ADMIN)) { 44437c0c7269SOmar Sandoval ret = -EPERM; 44447c0c7269SOmar Sandoval goto out_acct; 44457c0c7269SOmar Sandoval } 44467c0c7269SOmar Sandoval 44477c0c7269SOmar Sandoval if (!(file->f_mode & FMODE_WRITE)) { 44487c0c7269SOmar Sandoval ret = -EBADF; 44497c0c7269SOmar Sandoval goto out_acct; 44507c0c7269SOmar Sandoval } 44517c0c7269SOmar Sandoval 44527c0c7269SOmar Sandoval if (compat) { 44537c0c7269SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 44547c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 args32; 44557c0c7269SOmar Sandoval 44567c0c7269SOmar Sandoval if (copy_from_user(&args32, argp, sizeof(args32))) { 44577c0c7269SOmar Sandoval ret = -EFAULT; 44587c0c7269SOmar Sandoval goto out_acct; 44597c0c7269SOmar Sandoval } 44607c0c7269SOmar Sandoval args.iov = compat_ptr(args32.iov); 44617c0c7269SOmar Sandoval args.iovcnt = args32.iovcnt; 44627c0c7269SOmar Sandoval args.offset = args32.offset; 44637c0c7269SOmar Sandoval args.flags = args32.flags; 44647c0c7269SOmar Sandoval args.len = args32.len; 44657c0c7269SOmar Sandoval args.unencoded_len = args32.unencoded_len; 44667c0c7269SOmar Sandoval args.unencoded_offset = args32.unencoded_offset; 44677c0c7269SOmar Sandoval args.compression = args32.compression; 44687c0c7269SOmar Sandoval args.encryption = args32.encryption; 44697c0c7269SOmar Sandoval memcpy(args.reserved, args32.reserved, sizeof(args.reserved)); 44707c0c7269SOmar Sandoval #else 44717c0c7269SOmar Sandoval return -ENOTTY; 44727c0c7269SOmar Sandoval #endif 44737c0c7269SOmar Sandoval } else { 44747c0c7269SOmar Sandoval if (copy_from_user(&args, argp, sizeof(args))) { 44757c0c7269SOmar Sandoval ret = -EFAULT; 44767c0c7269SOmar Sandoval goto out_acct; 44777c0c7269SOmar Sandoval } 44787c0c7269SOmar Sandoval } 44797c0c7269SOmar Sandoval 44807c0c7269SOmar Sandoval ret = -EINVAL; 44817c0c7269SOmar Sandoval if (args.flags != 0) 44827c0c7269SOmar Sandoval goto out_acct; 44837c0c7269SOmar Sandoval if (memchr_inv(args.reserved, 0, sizeof(args.reserved))) 44847c0c7269SOmar Sandoval goto out_acct; 44857c0c7269SOmar Sandoval if (args.compression == BTRFS_ENCODED_IO_COMPRESSION_NONE && 44867c0c7269SOmar Sandoval args.encryption == BTRFS_ENCODED_IO_ENCRYPTION_NONE) 44877c0c7269SOmar Sandoval goto out_acct; 44887c0c7269SOmar Sandoval if (args.compression >= BTRFS_ENCODED_IO_COMPRESSION_TYPES || 44897c0c7269SOmar Sandoval args.encryption >= BTRFS_ENCODED_IO_ENCRYPTION_TYPES) 44907c0c7269SOmar Sandoval goto out_acct; 44917c0c7269SOmar Sandoval if (args.unencoded_offset > args.unencoded_len) 44927c0c7269SOmar Sandoval goto out_acct; 44937c0c7269SOmar Sandoval if (args.len > args.unencoded_len - args.unencoded_offset) 44947c0c7269SOmar Sandoval goto out_acct; 44957c0c7269SOmar Sandoval 44967c0c7269SOmar Sandoval ret = import_iovec(WRITE, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), 44977c0c7269SOmar Sandoval &iov, &iter); 44987c0c7269SOmar Sandoval if (ret < 0) 44997c0c7269SOmar Sandoval goto out_acct; 45007c0c7269SOmar Sandoval 45017c0c7269SOmar Sandoval file_start_write(file); 45027c0c7269SOmar Sandoval 45037c0c7269SOmar Sandoval if (iov_iter_count(&iter) == 0) { 45047c0c7269SOmar Sandoval ret = 0; 45057c0c7269SOmar Sandoval goto out_end_write; 45067c0c7269SOmar Sandoval } 45077c0c7269SOmar Sandoval pos = args.offset; 45087c0c7269SOmar Sandoval ret = rw_verify_area(WRITE, file, &pos, args.len); 45097c0c7269SOmar Sandoval if (ret < 0) 45107c0c7269SOmar Sandoval goto out_end_write; 45117c0c7269SOmar Sandoval 45127c0c7269SOmar Sandoval init_sync_kiocb(&kiocb, file); 45137c0c7269SOmar Sandoval ret = kiocb_set_rw_flags(&kiocb, 0); 45147c0c7269SOmar Sandoval if (ret) 45157c0c7269SOmar Sandoval goto out_end_write; 45167c0c7269SOmar Sandoval kiocb.ki_pos = pos; 45177c0c7269SOmar Sandoval 45187c0c7269SOmar Sandoval ret = btrfs_do_write_iter(&kiocb, &iter, &args); 45197c0c7269SOmar Sandoval if (ret > 0) 45207c0c7269SOmar Sandoval fsnotify_modify(file); 45217c0c7269SOmar Sandoval 45227c0c7269SOmar Sandoval out_end_write: 45237c0c7269SOmar Sandoval file_end_write(file); 45247c0c7269SOmar Sandoval kfree(iov); 45257c0c7269SOmar Sandoval out_acct: 45267c0c7269SOmar Sandoval if (ret > 0) 45277c0c7269SOmar Sandoval add_wchar(current, ret); 45287c0c7269SOmar Sandoval inc_syscw(current); 45297c0c7269SOmar Sandoval return ret; 45307c0c7269SOmar Sandoval } 45317c0c7269SOmar Sandoval 4532f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4533f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4534f46b5a66SChristoph Hellwig { 45350b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45360b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45370b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 45384bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4539f46b5a66SChristoph Hellwig 4540f46b5a66SChristoph Hellwig switch (cmd) { 45416cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 4542dc408ccdSSahil Kang return btrfs_ioctl_getversion(inode, argp); 454340cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4544b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 454540cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 454640cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4547f7039b1dSLi Dongyang case FITRIM: 4548b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4549f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4550fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4551fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4552fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 45533de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4554fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 45556f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 45566f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 455776dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4558949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4559949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4560949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 45610caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 45629ad12305SSahil Kang return btrfs_ioctl_subvol_getflags(inode, argp); 45630caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 45640caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 45656ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 45666ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4567f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 45681e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 45691e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 45701e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4571f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4572198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4573f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 45742ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 4575f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4576da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 45776b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 45786b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 4579475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 45802ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 4581475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 45822ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 4583ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 45849ad12305SSahil Kang return btrfs_ioctl_tree_search(inode, argp); 4585cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 45869ad12305SSahil Kang return btrfs_ioctl_tree_search_v2(inode, argp); 4587ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4588dc408ccdSSahil Kang return btrfs_ioctl_ino_lookup(root, argp); 4589d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4590d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4591d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4592d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 4593d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 4594d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 45951406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 45962ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 45979b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 45989b199859SFilipe David Borba Manana int ret; 45999b199859SFilipe David Borba Manana 46009db4dc24SNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 46019b199859SFilipe David Borba Manana if (ret) 46029b199859SFilipe David Borba Manana return ret; 46030b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 46042fad4e83SDavid Sterba /* 46052fad4e83SDavid Sterba * The transaction thread may want to do more work, 460601327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 46072fad4e83SDavid Sterba * processing uncleaned subvols. 46082fad4e83SDavid Sterba */ 46090b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 46109b199859SFilipe David Borba Manana return ret; 46119b199859SFilipe David Borba Manana } 461246204592SSage Weil case BTRFS_IOC_START_SYNC: 46139a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 461446204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 46152ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 4616475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4617b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4618475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 46192ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 4620475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 46212ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 4622c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 46239ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4624837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 46252ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 462619a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 46272ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 46288ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 46298ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 4630abccd00fSHugo Mills #ifdef CONFIG_64BIT 4631abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 4632abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 4633abccd00fSHugo Mills #endif 463431db9f7cSAlexander Block case BTRFS_IOC_SEND: 46359ad12305SSahil Kang return _btrfs_ioctl_send(inode, argp, false); 46362351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 46372351f431SJosef Bacik case BTRFS_IOC_SEND_32: 46389ad12305SSahil Kang return _btrfs_ioctl_send(inode, argp, true); 46392351f431SJosef Bacik #endif 4640c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 46412ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 46425d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4643905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 46445d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4645905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 46465d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4647905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 46485d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4649905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 46502f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 46512f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 46522f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 4653b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 465457254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 4655b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 46563f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 46572ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 46582eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 4659d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 46602eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 4661b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 46622eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 46632eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 4664b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 46659ad12305SSahil Kang return btrfs_ioctl_get_subvol_info(inode, argp); 466642e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 4667dc408ccdSSahil Kang return btrfs_ioctl_get_subvol_rootref(root, argp); 466823d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 466923d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 467014605409SBoris Burkov case FS_IOC_ENABLE_VERITY: 467114605409SBoris Burkov return fsverity_ioctl_enable(file, (const void __user *)argp); 467214605409SBoris Burkov case FS_IOC_MEASURE_VERITY: 467314605409SBoris Burkov return fsverity_ioctl_measure(file, argp); 46741881fba8SOmar Sandoval case BTRFS_IOC_ENCODED_READ: 46751881fba8SOmar Sandoval return btrfs_ioctl_encoded_read(file, argp, false); 46767c0c7269SOmar Sandoval case BTRFS_IOC_ENCODED_WRITE: 46777c0c7269SOmar Sandoval return btrfs_ioctl_encoded_write(file, argp, false); 46781881fba8SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 46791881fba8SOmar Sandoval case BTRFS_IOC_ENCODED_READ_32: 46801881fba8SOmar Sandoval return btrfs_ioctl_encoded_read(file, argp, true); 46817c0c7269SOmar Sandoval case BTRFS_IOC_ENCODED_WRITE_32: 46827c0c7269SOmar Sandoval return btrfs_ioctl_encoded_write(file, argp, true); 46831881fba8SOmar Sandoval #endif 4684f46b5a66SChristoph Hellwig } 4685f46b5a66SChristoph Hellwig 4686f46b5a66SChristoph Hellwig return -ENOTTY; 4687f46b5a66SChristoph Hellwig } 46884c63c245SLuke Dashjr 46894c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 46904c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 46914c63c245SLuke Dashjr { 46922a362249SJeff Mahoney /* 46932a362249SJeff Mahoney * These all access 32-bit values anyway so no further 46942a362249SJeff Mahoney * handling is necessary. 46952a362249SJeff Mahoney */ 46964c63c245SLuke Dashjr switch (cmd) { 46974c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 46984c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 46994c63c245SLuke Dashjr break; 47004c63c245SLuke Dashjr } 47014c63c245SLuke Dashjr 47024c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 47034c63c245SLuke Dashjr } 47044c63c245SLuke Dashjr #endif 4705