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" 57*59b818e0SJosef Bacik #include "defrag.h" 58f46b5a66SChristoph Hellwig 59abccd00fSHugo Mills #ifdef CONFIG_64BIT 60abccd00fSHugo Mills /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI 61abccd00fSHugo Mills * structures are incorrect, as the timespec structure from userspace 62abccd00fSHugo Mills * is 4 bytes too small. We define these alternatives here to teach 63abccd00fSHugo Mills * the kernel about the 32-bit struct packing. 64abccd00fSHugo Mills */ 65abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 { 66abccd00fSHugo Mills __u64 sec; 67abccd00fSHugo Mills __u32 nsec; 68abccd00fSHugo Mills } __attribute__ ((__packed__)); 69abccd00fSHugo Mills 70abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 { 71abccd00fSHugo Mills char uuid[BTRFS_UUID_SIZE]; /* in */ 72abccd00fSHugo Mills __u64 stransid; /* in */ 73abccd00fSHugo Mills __u64 rtransid; /* out */ 74abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 stime; /* in */ 75abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 rtime; /* out */ 76abccd00fSHugo Mills __u64 flags; /* in */ 77abccd00fSHugo Mills __u64 reserved[16]; /* in */ 78abccd00fSHugo Mills } __attribute__ ((__packed__)); 79abccd00fSHugo Mills 80abccd00fSHugo Mills #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ 81abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32) 82abccd00fSHugo Mills #endif 83abccd00fSHugo Mills 842351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 852351f431SJosef Bacik struct btrfs_ioctl_send_args_32 { 862351f431SJosef Bacik __s64 send_fd; /* in */ 872351f431SJosef Bacik __u64 clone_sources_count; /* in */ 882351f431SJosef Bacik compat_uptr_t clone_sources; /* in */ 892351f431SJosef Bacik __u64 parent_root; /* in */ 902351f431SJosef Bacik __u64 flags; /* in */ 91e77fbf99SDavid Sterba __u32 version; /* in */ 92e77fbf99SDavid Sterba __u8 reserved[28]; /* in */ 932351f431SJosef Bacik } __attribute__ ((__packed__)); 942351f431SJosef Bacik 952351f431SJosef Bacik #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \ 962351f431SJosef Bacik struct btrfs_ioctl_send_args_32) 971881fba8SOmar Sandoval 981881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 { 991881fba8SOmar Sandoval compat_uptr_t iov; 1001881fba8SOmar Sandoval compat_ulong_t iovcnt; 1011881fba8SOmar Sandoval __s64 offset; 1021881fba8SOmar Sandoval __u64 flags; 1031881fba8SOmar Sandoval __u64 len; 1041881fba8SOmar Sandoval __u64 unencoded_len; 1051881fba8SOmar Sandoval __u64 unencoded_offset; 1061881fba8SOmar Sandoval __u32 compression; 1071881fba8SOmar Sandoval __u32 encryption; 1081881fba8SOmar Sandoval __u8 reserved[64]; 1091881fba8SOmar Sandoval }; 1101881fba8SOmar Sandoval 1111881fba8SOmar Sandoval #define BTRFS_IOC_ENCODED_READ_32 _IOR(BTRFS_IOCTL_MAGIC, 64, \ 1121881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32) 1137c0c7269SOmar Sandoval #define BTRFS_IOC_ENCODED_WRITE_32 _IOW(BTRFS_IOCTL_MAGIC, 64, \ 1147c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32) 1152351f431SJosef Bacik #endif 116abccd00fSHugo Mills 1176cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 1181905a0f7SDavid Sterba static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode, 1191905a0f7SDavid Sterba unsigned int flags) 1206cbff00fSChristoph Hellwig { 1211905a0f7SDavid Sterba if (S_ISDIR(inode->i_mode)) 1226cbff00fSChristoph Hellwig return flags; 1231905a0f7SDavid Sterba else if (S_ISREG(inode->i_mode)) 1246cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 1256cbff00fSChristoph Hellwig else 1266cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 1276cbff00fSChristoph Hellwig } 128f46b5a66SChristoph Hellwig 1296cbff00fSChristoph Hellwig /* 130a157d4fdSDavid Sterba * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS 131a157d4fdSDavid Sterba * ioctl. 1326cbff00fSChristoph Hellwig */ 13377eea05eSBoris Burkov static unsigned int btrfs_inode_flags_to_fsflags(struct btrfs_inode *binode) 1346cbff00fSChristoph Hellwig { 1356cbff00fSChristoph Hellwig unsigned int iflags = 0; 13677eea05eSBoris Burkov u32 flags = binode->flags; 13714605409SBoris Burkov u32 ro_flags = binode->ro_flags; 1386cbff00fSChristoph Hellwig 1396cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 1406cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 1416cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 1426cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 1436cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 1446cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 1456cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 1466cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 1476cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 1486cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 1496cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 1506cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 151d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 152d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 15314605409SBoris Burkov if (ro_flags & BTRFS_INODE_RO_VERITY) 15414605409SBoris Burkov iflags |= FS_VERITY_FL; 155d0092bddSLi Zefan 15613f48dc9SSatoru Takeuchi if (flags & BTRFS_INODE_NOCOMPRESS) 157d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 15813f48dc9SSatoru Takeuchi else if (flags & BTRFS_INODE_COMPRESS) 15913f48dc9SSatoru Takeuchi iflags |= FS_COMPR_FL; 1606cbff00fSChristoph Hellwig 1616cbff00fSChristoph Hellwig return iflags; 1626cbff00fSChristoph Hellwig } 1636cbff00fSChristoph Hellwig 1646cbff00fSChristoph Hellwig /* 1656cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1666cbff00fSChristoph Hellwig */ 1677b6a221eSDavid Sterba void btrfs_sync_inode_flags_to_i_flags(struct inode *inode) 1686cbff00fSChristoph Hellwig { 1695c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 1703cc79392SFilipe Manana unsigned int new_fl = 0; 1716cbff00fSChristoph Hellwig 1725c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_SYNC) 1733cc79392SFilipe Manana new_fl |= S_SYNC; 1745c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_IMMUTABLE) 1753cc79392SFilipe Manana new_fl |= S_IMMUTABLE; 1765c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_APPEND) 1773cc79392SFilipe Manana new_fl |= S_APPEND; 1785c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_NOATIME) 1793cc79392SFilipe Manana new_fl |= S_NOATIME; 1805c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_DIRSYNC) 1813cc79392SFilipe Manana new_fl |= S_DIRSYNC; 18214605409SBoris Burkov if (binode->ro_flags & BTRFS_INODE_RO_VERITY) 18314605409SBoris Burkov new_fl |= S_VERITY; 1843cc79392SFilipe Manana 1853cc79392SFilipe Manana set_mask_bits(&inode->i_flags, 18614605409SBoris Burkov S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC | 18714605409SBoris Burkov S_VERITY, new_fl); 1886cbff00fSChristoph Hellwig } 1896cbff00fSChristoph Hellwig 190f37c563bSDavid Sterba /* 191f37c563bSDavid Sterba * Check if @flags are a supported and valid set of FS_*_FL flags and that 192f37c563bSDavid Sterba * the old and new flags are not conflicting 193f37c563bSDavid Sterba */ 194f37c563bSDavid Sterba static int check_fsflags(unsigned int old_flags, unsigned int flags) 19575e7cb7fSLiu Bo { 19675e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 19775e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 19875e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 199e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 200e1e8fb6aSLi Zefan FS_NOCOW_FL)) 20175e7cb7fSLiu Bo return -EOPNOTSUPP; 20275e7cb7fSLiu Bo 203f37c563bSDavid Sterba /* COMPR and NOCOMP on new/old are valid */ 20475e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 20575e7cb7fSLiu Bo return -EINVAL; 20675e7cb7fSLiu Bo 207f37c563bSDavid Sterba if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL)) 208f37c563bSDavid Sterba return -EINVAL; 209f37c563bSDavid Sterba 210f37c563bSDavid Sterba /* NOCOW and compression options are mutually exclusive */ 211f37c563bSDavid Sterba if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 212f37c563bSDavid Sterba return -EINVAL; 213f37c563bSDavid Sterba if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 214f37c563bSDavid Sterba return -EINVAL; 215f37c563bSDavid Sterba 21675e7cb7fSLiu Bo return 0; 21775e7cb7fSLiu Bo } 21875e7cb7fSLiu Bo 219d206e9c9SNaohiro Aota static int check_fsflags_compatible(struct btrfs_fs_info *fs_info, 220d206e9c9SNaohiro Aota unsigned int flags) 221d206e9c9SNaohiro Aota { 222d206e9c9SNaohiro Aota if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL)) 223d206e9c9SNaohiro Aota return -EPERM; 224d206e9c9SNaohiro Aota 225d206e9c9SNaohiro Aota return 0; 226d206e9c9SNaohiro Aota } 227d206e9c9SNaohiro Aota 22897fc2977SMiklos Szeredi /* 22997fc2977SMiklos Szeredi * Set flags/xflags from the internal inode flags. The remaining items of 23097fc2977SMiklos Szeredi * fsxattr are zeroed. 23197fc2977SMiklos Szeredi */ 23297fc2977SMiklos Szeredi int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa) 2336cbff00fSChristoph Hellwig { 23497fc2977SMiklos Szeredi struct btrfs_inode *binode = BTRFS_I(d_inode(dentry)); 23597fc2977SMiklos Szeredi 23677eea05eSBoris Burkov fileattr_fill_flags(fa, btrfs_inode_flags_to_fsflags(binode)); 23797fc2977SMiklos Szeredi return 0; 23897fc2977SMiklos Szeredi } 23997fc2977SMiklos Szeredi 24097fc2977SMiklos Szeredi int btrfs_fileattr_set(struct user_namespace *mnt_userns, 24197fc2977SMiklos Szeredi struct dentry *dentry, struct fileattr *fa) 24297fc2977SMiklos Szeredi { 24397fc2977SMiklos Szeredi struct inode *inode = d_inode(dentry); 2440b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 2455c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 2465c57b8b6SDavid Sterba struct btrfs_root *root = binode->root; 2476cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 2485aca2842SDarrick J. Wong unsigned int fsflags, old_fsflags; 2496cbff00fSChristoph Hellwig int ret; 250ff9fef55SAnand Jain const char *comp = NULL; 251f37c563bSDavid Sterba u32 binode_flags; 2526cbff00fSChristoph Hellwig 253b83cc969SLi Zefan if (btrfs_root_readonly(root)) 254b83cc969SLi Zefan return -EROFS; 255b83cc969SLi Zefan 25697fc2977SMiklos Szeredi if (fileattr_has_fsx(fa)) 25797fc2977SMiklos Szeredi return -EOPNOTSUPP; 2586cbff00fSChristoph Hellwig 25997fc2977SMiklos Szeredi fsflags = btrfs_mask_fsflags_for_type(inode, fa->flags); 26077eea05eSBoris Burkov old_fsflags = btrfs_inode_flags_to_fsflags(binode); 26197fc2977SMiklos Szeredi ret = check_fsflags(old_fsflags, fsflags); 262e7848683SJan Kara if (ret) 263e7848683SJan Kara return ret; 264e7848683SJan Kara 265d206e9c9SNaohiro Aota ret = check_fsflags_compatible(fs_info, fsflags); 266d206e9c9SNaohiro Aota if (ret) 26797fc2977SMiklos Szeredi return ret; 268d206e9c9SNaohiro Aota 269f37c563bSDavid Sterba binode_flags = binode->flags; 2705c57b8b6SDavid Sterba if (fsflags & FS_SYNC_FL) 271d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_SYNC; 2726cbff00fSChristoph Hellwig else 273d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_SYNC; 2745c57b8b6SDavid Sterba if (fsflags & FS_IMMUTABLE_FL) 275d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_IMMUTABLE; 2766cbff00fSChristoph Hellwig else 277d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_IMMUTABLE; 2785c57b8b6SDavid Sterba if (fsflags & FS_APPEND_FL) 279d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_APPEND; 2806cbff00fSChristoph Hellwig else 281d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_APPEND; 2825c57b8b6SDavid Sterba if (fsflags & FS_NODUMP_FL) 283d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODUMP; 2846cbff00fSChristoph Hellwig else 285d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODUMP; 2865c57b8b6SDavid Sterba if (fsflags & FS_NOATIME_FL) 287d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOATIME; 2886cbff00fSChristoph Hellwig else 289d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOATIME; 29097fc2977SMiklos Szeredi 29197fc2977SMiklos Szeredi /* If coming from FS_IOC_FSSETXATTR then skip unconverted flags */ 29297fc2977SMiklos Szeredi if (!fa->flags_valid) { 29397fc2977SMiklos Szeredi /* 1 item for the inode */ 29497fc2977SMiklos Szeredi trans = btrfs_start_transaction(root, 1); 2959b8a233bSRitesh Harjani if (IS_ERR(trans)) 2969b8a233bSRitesh Harjani return PTR_ERR(trans); 29797fc2977SMiklos Szeredi goto update_flags; 29897fc2977SMiklos Szeredi } 29997fc2977SMiklos Szeredi 3005c57b8b6SDavid Sterba if (fsflags & FS_DIRSYNC_FL) 301d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_DIRSYNC; 3026cbff00fSChristoph Hellwig else 303d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_DIRSYNC; 3045c57b8b6SDavid Sterba if (fsflags & FS_NOCOW_FL) { 30544e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 3067e97b8daSDavid Sterba /* 3077e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 3087e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 3097e97b8daSDavid Sterba * status of the file and will not set it. 3107e97b8daSDavid Sterba */ 3117e97b8daSDavid Sterba if (inode->i_size == 0) 312d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW | 313d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM; 3147e97b8daSDavid Sterba } else { 315d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW; 3167e97b8daSDavid Sterba } 3177e97b8daSDavid Sterba } else { 3187e97b8daSDavid Sterba /* 31901327610SNicholas D Steeves * Revert back under same assumptions as above 3207e97b8daSDavid Sterba */ 32144e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 3227e97b8daSDavid Sterba if (inode->i_size == 0) 323d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_NODATACOW | 324d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM); 3257e97b8daSDavid Sterba } else { 326d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODATACOW; 3277e97b8daSDavid Sterba } 3287e97b8daSDavid Sterba } 3296cbff00fSChristoph Hellwig 33075e7cb7fSLiu Bo /* 33175e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 33275e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 33375e7cb7fSLiu Bo * things smaller. 33475e7cb7fSLiu Bo */ 3355c57b8b6SDavid Sterba if (fsflags & FS_NOCOMP_FL) { 336d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_COMPRESS; 337d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOCOMPRESS; 3385c57b8b6SDavid Sterba } else if (fsflags & FS_COMPR_FL) { 33963541927SFilipe David Borba Manana 34097fc2977SMiklos Szeredi if (IS_SWAPFILE(inode)) 34197fc2977SMiklos Szeredi return -ETXTBSY; 342eede2bf3SOmar Sandoval 343d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_COMPRESS; 344d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOCOMPRESS; 34563541927SFilipe David Borba Manana 34693370509SDavid Sterba comp = btrfs_compress_type2str(fs_info->compress_type); 34793370509SDavid Sterba if (!comp || comp[0] == 0) 34893370509SDavid Sterba comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB); 349ebcb904dSLi Zefan } else { 350d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 35175e7cb7fSLiu Bo } 3526cbff00fSChristoph Hellwig 353ff9fef55SAnand Jain /* 354ff9fef55SAnand Jain * 1 for inode item 355ff9fef55SAnand Jain * 2 for properties 356ff9fef55SAnand Jain */ 357ff9fef55SAnand Jain trans = btrfs_start_transaction(root, 3); 35897fc2977SMiklos Szeredi if (IS_ERR(trans)) 35997fc2977SMiklos Szeredi return PTR_ERR(trans); 3606cbff00fSChristoph Hellwig 361ff9fef55SAnand Jain if (comp) { 362ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp, 363ff9fef55SAnand Jain strlen(comp), 0); 364ff9fef55SAnand Jain if (ret) { 365ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 366ff9fef55SAnand Jain goto out_end_trans; 367ff9fef55SAnand Jain } 368ff9fef55SAnand Jain } else { 369ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL, 370ff9fef55SAnand Jain 0, 0); 371ff9fef55SAnand Jain if (ret && ret != -ENODATA) { 372ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 373ff9fef55SAnand Jain goto out_end_trans; 374ff9fef55SAnand Jain } 375ff9fef55SAnand Jain } 376ff9fef55SAnand Jain 37797fc2977SMiklos Szeredi update_flags: 378d2b8fcfeSAnand Jain binode->flags = binode_flags; 3797b6a221eSDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 3800c4d2d95SJosef Bacik inode_inc_iversion(inode); 381c2050a45SDeepa Dinamani inode->i_ctime = current_time(inode); 3829a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); 3836cbff00fSChristoph Hellwig 384ff9fef55SAnand Jain out_end_trans: 3853a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3862d4e6f6aSliubo return ret; 3876cbff00fSChristoph Hellwig } 3886cbff00fSChristoph Hellwig 3890d7ed32cSDavid Sterba /* 3900d7ed32cSDavid Sterba * Start exclusive operation @type, return true on success 3910d7ed32cSDavid Sterba */ 392c3e1f96cSGoldwyn Rodrigues bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, 393c3e1f96cSGoldwyn Rodrigues enum btrfs_exclusive_operation type) 394c3e1f96cSGoldwyn Rodrigues { 3950d7ed32cSDavid Sterba bool ret = false; 3960d7ed32cSDavid Sterba 3970d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 3980d7ed32cSDavid Sterba if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) { 3990d7ed32cSDavid Sterba fs_info->exclusive_operation = type; 4000d7ed32cSDavid Sterba ret = true; 4010d7ed32cSDavid Sterba } 4020d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 4030d7ed32cSDavid Sterba 4040d7ed32cSDavid Sterba return ret; 405c3e1f96cSGoldwyn Rodrigues } 406c3e1f96cSGoldwyn Rodrigues 407578bda9eSDavid Sterba /* 408578bda9eSDavid Sterba * Conditionally allow to enter the exclusive operation in case it's compatible 409578bda9eSDavid Sterba * with the running one. This must be paired with btrfs_exclop_start_unlock and 410578bda9eSDavid Sterba * btrfs_exclop_finish. 411578bda9eSDavid Sterba * 412578bda9eSDavid Sterba * Compatibility: 413578bda9eSDavid Sterba * - the same type is already running 414621a1ee1SNikolay Borisov * - when trying to add a device and balance has been paused 415578bda9eSDavid Sterba * - not BTRFS_EXCLOP_NONE - this is intentionally incompatible and the caller 416578bda9eSDavid Sterba * must check the condition first that would allow none -> @type 417578bda9eSDavid Sterba */ 418578bda9eSDavid Sterba bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info, 419578bda9eSDavid Sterba enum btrfs_exclusive_operation type) 420578bda9eSDavid Sterba { 421578bda9eSDavid Sterba spin_lock(&fs_info->super_lock); 422621a1ee1SNikolay Borisov if (fs_info->exclusive_operation == type || 423621a1ee1SNikolay Borisov (fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED && 424621a1ee1SNikolay Borisov type == BTRFS_EXCLOP_DEV_ADD)) 425578bda9eSDavid Sterba return true; 426578bda9eSDavid Sterba 427578bda9eSDavid Sterba spin_unlock(&fs_info->super_lock); 428578bda9eSDavid Sterba return false; 429578bda9eSDavid Sterba } 430578bda9eSDavid Sterba 431578bda9eSDavid Sterba void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info) 432578bda9eSDavid Sterba { 433578bda9eSDavid Sterba spin_unlock(&fs_info->super_lock); 434578bda9eSDavid Sterba } 435578bda9eSDavid Sterba 436c3e1f96cSGoldwyn Rodrigues void btrfs_exclop_finish(struct btrfs_fs_info *fs_info) 437c3e1f96cSGoldwyn Rodrigues { 4380d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 439c3e1f96cSGoldwyn Rodrigues WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE); 4400d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 44166a2823cSGoldwyn Rodrigues sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation"); 442c3e1f96cSGoldwyn Rodrigues } 443c3e1f96cSGoldwyn Rodrigues 444efc0e69cSNikolay Borisov void btrfs_exclop_balance(struct btrfs_fs_info *fs_info, 445efc0e69cSNikolay Borisov enum btrfs_exclusive_operation op) 446efc0e69cSNikolay Borisov { 447efc0e69cSNikolay Borisov switch (op) { 448efc0e69cSNikolay Borisov case BTRFS_EXCLOP_BALANCE_PAUSED: 449efc0e69cSNikolay Borisov spin_lock(&fs_info->super_lock); 450efc0e69cSNikolay Borisov ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE || 451efc0e69cSNikolay Borisov fs_info->exclusive_operation == BTRFS_EXCLOP_DEV_ADD); 452efc0e69cSNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE_PAUSED; 453efc0e69cSNikolay Borisov spin_unlock(&fs_info->super_lock); 454efc0e69cSNikolay Borisov break; 455efc0e69cSNikolay Borisov case BTRFS_EXCLOP_BALANCE: 456efc0e69cSNikolay Borisov spin_lock(&fs_info->super_lock); 457efc0e69cSNikolay Borisov ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED); 458efc0e69cSNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE; 459efc0e69cSNikolay Borisov spin_unlock(&fs_info->super_lock); 460efc0e69cSNikolay Borisov break; 461efc0e69cSNikolay Borisov default: 462efc0e69cSNikolay Borisov btrfs_warn(fs_info, 463efc0e69cSNikolay Borisov "invalid exclop balance operation %d requested", op); 464efc0e69cSNikolay Borisov } 465efc0e69cSNikolay Borisov } 466efc0e69cSNikolay Borisov 467dc408ccdSSahil Kang static int btrfs_ioctl_getversion(struct inode *inode, int __user *arg) 4686cbff00fSChristoph Hellwig { 4696cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 4706cbff00fSChristoph Hellwig } 471f46b5a66SChristoph Hellwig 472b929c1d8SMarcos Paulo de Souza static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, 473b929c1d8SMarcos Paulo de Souza void __user *arg) 474f7039b1dSLi Dongyang { 475f7039b1dSLi Dongyang struct btrfs_device *device; 476f7039b1dSLi Dongyang struct fstrim_range range; 477f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 478f7039b1dSLi Dongyang u64 num_devices = 0; 479f7039b1dSLi Dongyang int ret; 480f7039b1dSLi Dongyang 481f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 482f7039b1dSLi Dongyang return -EPERM; 483f7039b1dSLi Dongyang 484f35f06c3SFilipe Manana /* 4851cb3dc3fSNaohiro Aota * btrfs_trim_block_group() depends on space cache, which is not 4861cb3dc3fSNaohiro Aota * available in zoned filesystem. So, disallow fitrim on a zoned 4871cb3dc3fSNaohiro Aota * filesystem for now. 4881cb3dc3fSNaohiro Aota */ 4891cb3dc3fSNaohiro Aota if (btrfs_is_zoned(fs_info)) 4901cb3dc3fSNaohiro Aota return -EOPNOTSUPP; 4911cb3dc3fSNaohiro Aota 4921cb3dc3fSNaohiro Aota /* 493f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 494f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 495f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 496f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 497f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 498f35f06c3SFilipe Manana */ 499f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 500f35f06c3SFilipe Manana return -EROFS; 501f35f06c3SFilipe Manana 5021f78160cSXiao Guangrong rcu_read_lock(); 5031f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 5041f78160cSXiao Guangrong dev_list) { 5057b47ef52SChristoph Hellwig if (!device->bdev || !bdev_max_discard_sectors(device->bdev)) 506f7039b1dSLi Dongyang continue; 507f7039b1dSLi Dongyang num_devices++; 5087b47ef52SChristoph Hellwig minlen = min_t(u64, bdev_discard_granularity(device->bdev), 509f7039b1dSLi Dongyang minlen); 510f7039b1dSLi Dongyang } 5111f78160cSXiao Guangrong rcu_read_unlock(); 512f4c697e6SLukas Czerner 513f7039b1dSLi Dongyang if (!num_devices) 514f7039b1dSLi Dongyang return -EOPNOTSUPP; 515f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 516f7039b1dSLi Dongyang return -EFAULT; 5176ba9fc8eSQu Wenruo 5186ba9fc8eSQu Wenruo /* 5196ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 5206ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 5216ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 5226ba9fc8eSQu Wenruo */ 5236ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 524f4c697e6SLukas Czerner return -EINVAL; 525f7039b1dSLi Dongyang 526f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 5272ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 528f7039b1dSLi Dongyang if (ret < 0) 529f7039b1dSLi Dongyang return ret; 530f7039b1dSLi Dongyang 531f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 532f7039b1dSLi Dongyang return -EFAULT; 533f7039b1dSLi Dongyang 534f7039b1dSLi Dongyang return 0; 535f7039b1dSLi Dongyang } 536f7039b1dSLi Dongyang 537e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 538dd5f9615SStefan Behrens { 53946e0f66aSChris Mason int i; 54046e0f66aSChris Mason 54146e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 54246e0f66aSChris Mason if (uuid[i]) 54346e0f66aSChris Mason return 0; 54446e0f66aSChris Mason } 54546e0f66aSChris Mason return 1; 546dd5f9615SStefan Behrens } 547dd5f9615SStefan Behrens 5483538d68dSOmar Sandoval /* 5493538d68dSOmar Sandoval * Calculate the number of transaction items to reserve for creating a subvolume 5503538d68dSOmar Sandoval * or snapshot, not including the inode, directory entries, or parent directory. 5513538d68dSOmar Sandoval */ 5523538d68dSOmar Sandoval static unsigned int create_subvol_num_items(struct btrfs_qgroup_inherit *inherit) 5533538d68dSOmar Sandoval { 5543538d68dSOmar Sandoval /* 5553538d68dSOmar Sandoval * 1 to add root block 5563538d68dSOmar Sandoval * 1 to add root item 5573538d68dSOmar Sandoval * 1 to add root ref 5583538d68dSOmar Sandoval * 1 to add root backref 5593538d68dSOmar Sandoval * 1 to add UUID item 5603538d68dSOmar Sandoval * 1 to add qgroup info 5613538d68dSOmar Sandoval * 1 to add qgroup limit 5623538d68dSOmar Sandoval * 5633538d68dSOmar Sandoval * Ideally the last two would only be accounted if qgroups are enabled, 5643538d68dSOmar Sandoval * but that can change between now and the time we would insert them. 5653538d68dSOmar Sandoval */ 5663538d68dSOmar Sandoval unsigned int num_items = 7; 5673538d68dSOmar Sandoval 5683538d68dSOmar Sandoval if (inherit) { 5693538d68dSOmar Sandoval /* 2 to add qgroup relations for each inherited qgroup */ 5703538d68dSOmar Sandoval num_items += 2 * inherit->num_qgroups; 5713538d68dSOmar Sandoval } 5723538d68dSOmar Sandoval return num_items; 5733538d68dSOmar Sandoval } 5743538d68dSOmar Sandoval 5754d4340c9SChristian Brauner static noinline int create_subvol(struct user_namespace *mnt_userns, 5764d4340c9SChristian Brauner struct inode *dir, struct dentry *dentry, 5778696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 578f46b5a66SChristoph Hellwig { 5790b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 580f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 581f46b5a66SChristoph Hellwig struct btrfs_key key; 58249a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 583f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 584f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 585d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 58676dda93cSYan, Zheng struct btrfs_root *new_root; 587d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 58895582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 5893538d68dSOmar Sandoval struct btrfs_new_inode_args new_inode_args = { 5903538d68dSOmar Sandoval .dir = dir, 5913538d68dSOmar Sandoval .dentry = dentry, 5923538d68dSOmar Sandoval .subvol = true, 5933538d68dSOmar Sandoval }; 5943538d68dSOmar Sandoval unsigned int trans_num_items; 595f46b5a66SChristoph Hellwig int ret; 5962256e901SOmar Sandoval dev_t anon_dev; 597f46b5a66SChristoph Hellwig u64 objectid; 598f46b5a66SChristoph Hellwig 59949a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 60049a3c4d9SDavid Sterba if (!root_item) 60149a3c4d9SDavid Sterba return -ENOMEM; 60249a3c4d9SDavid Sterba 603543068a2SNikolay Borisov ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); 6042fbe8c8aSAl Viro if (ret) 6052256e901SOmar Sandoval goto out_root_item; 6062dfb1e43SQu Wenruo 607e09fe2d2SQu Wenruo /* 608e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 60901327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 610e09fe2d2SQu Wenruo */ 61149a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 61249a3c4d9SDavid Sterba ret = -ENOSPC; 6132256e901SOmar Sandoval goto out_root_item; 61449a3c4d9SDavid Sterba } 615e09fe2d2SQu Wenruo 6162256e901SOmar Sandoval ret = get_anon_bdev(&anon_dev); 6172256e901SOmar Sandoval if (ret < 0) 6182256e901SOmar Sandoval goto out_root_item; 6192256e901SOmar Sandoval 6203538d68dSOmar Sandoval new_inode_args.inode = btrfs_new_subvol_inode(mnt_userns, dir); 6213538d68dSOmar Sandoval if (!new_inode_args.inode) { 622a1fd0c35SOmar Sandoval ret = -ENOMEM; 623a1fd0c35SOmar Sandoval goto out_anon_dev; 624a1fd0c35SOmar Sandoval } 6253538d68dSOmar Sandoval ret = btrfs_new_inode_prepare(&new_inode_args, &trans_num_items); 626d5c12070SMiao Xie if (ret) 627a1fd0c35SOmar Sandoval goto out_inode; 6283538d68dSOmar Sandoval trans_num_items += create_subvol_num_items(inherit); 6293538d68dSOmar Sandoval 6303538d68dSOmar Sandoval btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 6313538d68dSOmar Sandoval ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 6323538d68dSOmar Sandoval trans_num_items, false); 6333538d68dSOmar Sandoval if (ret) 6343538d68dSOmar Sandoval goto out_new_inode_args; 635f46b5a66SChristoph Hellwig 636d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 637d5c12070SMiao Xie if (IS_ERR(trans)) { 638d5c12070SMiao Xie ret = PTR_ERR(trans); 639e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 6403538d68dSOmar Sandoval goto out_new_inode_args; 641d5c12070SMiao Xie } 642d5c12070SMiao Xie trans->block_rsv = &block_rsv; 643d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 644f46b5a66SChristoph Hellwig 645a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 6466f72c7e2SArne Jansen if (ret) 6472256e901SOmar Sandoval goto out; 6486f72c7e2SArne Jansen 6499631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 6509631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 6518e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 6528e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 6532256e901SOmar Sandoval goto out; 6548e8a1e31SJosef Bacik } 655f46b5a66SChristoph Hellwig 656f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 657f46b5a66SChristoph Hellwig 65849a3c4d9SDavid Sterba inode_item = &root_item->inode; 6593cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6603cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6613cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 662da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6630b246afaSJeff Mahoney fs_info->nodesize); 6643cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 665f46b5a66SChristoph Hellwig 66649a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 66749a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6683cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 66908fe4db1SLi Zefan 67049a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 67149a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 67249a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 67349a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 67449a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 67549a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 676f46b5a66SChristoph Hellwig 67749a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 67849a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 679807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 68049a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 68149a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 68249a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 68349a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 68449a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 685f46b5a66SChristoph Hellwig 686925baeddSChris Mason btrfs_tree_unlock(leaf); 687f46b5a66SChristoph Hellwig 68869948022SNikolay Borisov btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); 689f46b5a66SChristoph Hellwig 690f46b5a66SChristoph Hellwig key.objectid = objectid; 6915d4f98a2SYan Zheng key.offset = 0; 692962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 6930b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 69449a3c4d9SDavid Sterba root_item); 69567addf29SFilipe Manana if (ret) { 69667addf29SFilipe Manana /* 69767addf29SFilipe Manana * Since we don't abort the transaction in this case, free the 69867addf29SFilipe Manana * tree block so that we don't leak space and leave the 69967addf29SFilipe Manana * filesystem in an inconsistent state (an extent item in the 7007a163608SFilipe Manana * extent tree with a backreference for a root that does not 701212a58fdSFilipe Manana * exists). 70267addf29SFilipe Manana */ 703212a58fdSFilipe Manana btrfs_tree_lock(leaf); 704212a58fdSFilipe Manana btrfs_clean_tree_block(leaf); 705212a58fdSFilipe Manana btrfs_tree_unlock(leaf); 7067a163608SFilipe Manana btrfs_free_tree_block(trans, objectid, leaf, 0, 1); 70767addf29SFilipe Manana free_extent_buffer(leaf); 7082256e901SOmar Sandoval goto out; 70967addf29SFilipe Manana } 71067addf29SFilipe Manana 71167addf29SFilipe Manana free_extent_buffer(leaf); 71267addf29SFilipe Manana leaf = NULL; 713f46b5a66SChristoph Hellwig 7142dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 71579787eaaSJeff Mahoney if (IS_ERR(new_root)) { 71679787eaaSJeff Mahoney ret = PTR_ERR(new_root); 71766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 7182256e901SOmar Sandoval goto out; 71979787eaaSJeff Mahoney } 7202256e901SOmar Sandoval /* anon_dev is owned by new_root now. */ 7212dfb1e43SQu Wenruo anon_dev = 0; 7223538d68dSOmar Sandoval BTRFS_I(new_inode_args.inode)->root = new_root; 7233538d68dSOmar Sandoval /* ... and new_root is owned by new_inode_args.inode now. */ 72476dda93cSYan, Zheng 725221581e4SJosef Bacik ret = btrfs_record_root_in_trans(trans, new_root); 726221581e4SJosef Bacik if (ret) { 727221581e4SJosef Bacik btrfs_abort_transaction(trans, ret); 7282256e901SOmar Sandoval goto out; 729c7e54b51SJosef Bacik } 7300660b5afSChris Mason 731cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7326bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 733caae78e0SOmar Sandoval if (ret) { 73466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 735caae78e0SOmar Sandoval goto out; 736caae78e0SOmar Sandoval } 737dd5f9615SStefan Behrens 738caae78e0SOmar Sandoval ret = btrfs_create_new_inode(trans, &new_inode_args); 739caae78e0SOmar Sandoval if (ret) { 740caae78e0SOmar Sandoval btrfs_abort_transaction(trans, ret); 741caae78e0SOmar Sandoval goto out; 742caae78e0SOmar Sandoval } 743caae78e0SOmar Sandoval 744caae78e0SOmar Sandoval d_instantiate_new(dentry, new_inode_args.inode); 745caae78e0SOmar Sandoval new_inode_args.inode = NULL; 746f46b5a66SChristoph Hellwig 7472256e901SOmar Sandoval out: 748d5c12070SMiao Xie trans->block_rsv = NULL; 749d5c12070SMiao Xie trans->bytes_reserved = 0; 750e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 751de6e8200SLiu Bo 7521b58ae0eSFilipe Manana if (ret) 7531b58ae0eSFilipe Manana btrfs_end_transaction(trans); 7541b58ae0eSFilipe Manana else 7551b58ae0eSFilipe Manana ret = btrfs_commit_transaction(trans); 7563538d68dSOmar Sandoval out_new_inode_args: 7573538d68dSOmar Sandoval btrfs_new_inode_args_destroy(&new_inode_args); 758a1fd0c35SOmar Sandoval out_inode: 7593538d68dSOmar Sandoval iput(new_inode_args.inode); 7602256e901SOmar Sandoval out_anon_dev: 7612dfb1e43SQu Wenruo if (anon_dev) 7622dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 7632256e901SOmar Sandoval out_root_item: 76449a3c4d9SDavid Sterba kfree(root_item); 76549a3c4d9SDavid Sterba return ret; 766f46b5a66SChristoph Hellwig } 767f46b5a66SChristoph Hellwig 768e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7699babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 770e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 771f46b5a66SChristoph Hellwig { 7720b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7732e4bfab9SYan, Zheng struct inode *inode; 774f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 7753538d68dSOmar Sandoval unsigned int trans_num_items; 776f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7772e4bfab9SYan, Zheng int ret; 778f46b5a66SChristoph Hellwig 779813febdbSJosef Bacik /* We do not support snapshotting right now. */ 780813febdbSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 781813febdbSJosef Bacik btrfs_warn(fs_info, 782813febdbSJosef Bacik "extent tree v2 doesn't support snapshotting yet"); 783813febdbSJosef Bacik return -EOPNOTSUPP; 784813febdbSJosef Bacik } 785813febdbSJosef Bacik 78692a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 787f46b5a66SChristoph Hellwig return -EINVAL; 788f46b5a66SChristoph Hellwig 789eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 790eede2bf3SOmar Sandoval btrfs_warn(fs_info, 791eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 792eede2bf3SOmar Sandoval return -ETXTBSY; 793eede2bf3SOmar Sandoval } 794eede2bf3SOmar Sandoval 79523269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 796a1ee7362SDavid Sterba if (!pending_snapshot) 797a1ee7362SDavid Sterba return -ENOMEM; 798a1ee7362SDavid Sterba 7992dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 8002dfb1e43SQu Wenruo if (ret < 0) 8012dfb1e43SQu Wenruo goto free_pending; 802b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 80323269bf5SDavid Sterba GFP_KERNEL); 8048546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 8058546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 806b0c0ea63SDavid Sterba ret = -ENOMEM; 807b0c0ea63SDavid Sterba goto free_pending; 808b0c0ea63SDavid Sterba } 809b0c0ea63SDavid Sterba 81066d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 81166d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 812d5c12070SMiao Xie /* 8133538d68dSOmar Sandoval * 1 to add dir item 8143538d68dSOmar Sandoval * 1 to add dir index 8153538d68dSOmar Sandoval * 1 to update parent inode item 816d5c12070SMiao Xie */ 8173538d68dSOmar Sandoval trans_num_items = create_subvol_num_items(inherit) + 3; 818d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 8193538d68dSOmar Sandoval &pending_snapshot->block_rsv, 8203538d68dSOmar Sandoval trans_num_items, false); 821d5c12070SMiao Xie if (ret) 822c11fbb6eSRobbie Ko goto free_pending; 823d5c12070SMiao Xie 824a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 825a22285a6SYan, Zheng pending_snapshot->root = root; 826b83cc969SLi Zefan pending_snapshot->readonly = readonly; 827e9662f70SMiao Xie pending_snapshot->dir = dir; 8288696c533SMiao Xie pending_snapshot->inherit = inherit; 829a22285a6SYan, Zheng 830d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 831a22285a6SYan, Zheng if (IS_ERR(trans)) { 832a22285a6SYan, Zheng ret = PTR_ERR(trans); 833a22285a6SYan, Zheng goto fail; 834a22285a6SYan, Zheng } 835a22285a6SYan, Zheng 83628b21c55SFilipe Manana trans->pending_snapshot = pending_snapshot; 8379babda9fSNikolay Borisov 8383a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 839aec8030aSMiao Xie if (ret) 840c37b2b62SJosef Bacik goto fail; 841a22285a6SYan, Zheng 842a22285a6SYan, Zheng ret = pending_snapshot->error; 843f46b5a66SChristoph Hellwig if (ret) 8442e4bfab9SYan, Zheng goto fail; 845f46b5a66SChristoph Hellwig 846d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 847d3797308SChris Mason if (ret) 848d3797308SChris Mason goto fail; 849d3797308SChris Mason 8502b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8512e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8522e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8532e4bfab9SYan, Zheng goto fail; 8542e4bfab9SYan, Zheng } 8555662344bSTsutomu Itoh 8562e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8572e4bfab9SYan, Zheng ret = 0; 8582dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8592e4bfab9SYan, Zheng fail: 8602dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 8612dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8622dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 86300246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 864e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 865b0c0ea63SDavid Sterba free_pending: 8662dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8672dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 868b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8698546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 870a1ee7362SDavid Sterba kfree(pending_snapshot); 871a1ee7362SDavid Sterba 872f46b5a66SChristoph Hellwig return ret; 873f46b5a66SChristoph Hellwig } 874f46b5a66SChristoph Hellwig 8754260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8764260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8774260f7c7SSage Weil * whether the type of victim is right. 8784260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8794260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8804260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8814260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8824260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8834260f7c7SSage Weil * a. be owner of dir, or 8844260f7c7SSage Weil * b. be owner of victim, or 8854260f7c7SSage Weil * c. have CAP_FOWNER capability 88601327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 8874260f7c7SSage Weil * links pointing to it. 8884260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8894260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 8904260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 8914260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 8924260f7c7SSage Weil * nfs_async_unlink(). 8934260f7c7SSage Weil */ 8944260f7c7SSage Weil 895c4ed533bSChristian Brauner static int btrfs_may_delete(struct user_namespace *mnt_userns, 896c4ed533bSChristian Brauner struct inode *dir, struct dentry *victim, int isdir) 8974260f7c7SSage Weil { 8984260f7c7SSage Weil int error; 8994260f7c7SSage Weil 9002b0143b5SDavid Howells if (d_really_is_negative(victim)) 9014260f7c7SSage Weil return -ENOENT; 9024260f7c7SSage Weil 9032b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 9044fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 9054260f7c7SSage Weil 906c4ed533bSChristian Brauner error = inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); 9074260f7c7SSage Weil if (error) 9084260f7c7SSage Weil return error; 9094260f7c7SSage Weil if (IS_APPEND(dir)) 9104260f7c7SSage Weil return -EPERM; 911c4ed533bSChristian Brauner if (check_sticky(mnt_userns, dir, d_inode(victim)) || 912ba73d987SChristian Brauner IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) || 913ba73d987SChristian Brauner IS_SWAPFILE(d_inode(victim))) 9144260f7c7SSage Weil return -EPERM; 9154260f7c7SSage Weil if (isdir) { 916e36cb0b8SDavid Howells if (!d_is_dir(victim)) 9174260f7c7SSage Weil return -ENOTDIR; 9184260f7c7SSage Weil if (IS_ROOT(victim)) 9194260f7c7SSage Weil return -EBUSY; 920e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 9214260f7c7SSage Weil return -EISDIR; 9224260f7c7SSage Weil if (IS_DEADDIR(dir)) 9234260f7c7SSage Weil return -ENOENT; 9244260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 9254260f7c7SSage Weil return -EBUSY; 9264260f7c7SSage Weil return 0; 9274260f7c7SSage Weil } 9284260f7c7SSage Weil 929cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 9304d4340c9SChristian Brauner static inline int btrfs_may_create(struct user_namespace *mnt_userns, 9314d4340c9SChristian Brauner struct inode *dir, struct dentry *child) 932cb8e7090SChristoph Hellwig { 9332b0143b5SDavid Howells if (d_really_is_positive(child)) 934cb8e7090SChristoph Hellwig return -EEXIST; 935cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 936cb8e7090SChristoph Hellwig return -ENOENT; 9374d4340c9SChristian Brauner if (!fsuidgid_has_mapping(dir->i_sb, mnt_userns)) 9385474bf40SChristian Brauner return -EOVERFLOW; 9394d4340c9SChristian Brauner return inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); 940cb8e7090SChristoph Hellwig } 941cb8e7090SChristoph Hellwig 942cb8e7090SChristoph Hellwig /* 943cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 944cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 945cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 946cb8e7090SChristoph Hellwig */ 94792872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 9484d4340c9SChristian Brauner struct user_namespace *mnt_userns, 94952f75f4fSDavid Sterba const char *name, int namelen, 95072fd032eSSage Weil struct btrfs_root *snap_src, 9519babda9fSNikolay Borisov bool readonly, 9528696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 953cb8e7090SChristoph Hellwig { 9542b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9550b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 956cb8e7090SChristoph Hellwig struct dentry *dentry; 9576db75318SSweet Tea Dorminy struct fscrypt_str name_str = FSTR_INIT((char *)name, namelen); 958cb8e7090SChristoph Hellwig int error; 959cb8e7090SChristoph Hellwig 96000235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 96100235411SAl Viro if (error == -EINTR) 96200235411SAl Viro return error; 963cb8e7090SChristoph Hellwig 9644d4340c9SChristian Brauner dentry = lookup_one(mnt_userns, name, parent->dentry, namelen); 965cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 966cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 967cb8e7090SChristoph Hellwig goto out_unlock; 968cb8e7090SChristoph Hellwig 9694d4340c9SChristian Brauner error = btrfs_may_create(mnt_userns, dir, dentry); 970cb8e7090SChristoph Hellwig if (error) 971a874a63eSLiu Bo goto out_dput; 972cb8e7090SChristoph Hellwig 9739c52057cSChris Mason /* 9749c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9759c52057cSChris Mason * check for them now when we can safely fail 9769c52057cSChris Mason */ 9779c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 978e43eec81SSweet Tea Dorminy dir->i_ino, &name_str); 9799c52057cSChris Mason if (error) 9809c52057cSChris Mason goto out_dput; 9819c52057cSChris Mason 9820b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 98376dda93cSYan, Zheng 98476dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 98576dda93cSYan, Zheng goto out_up_read; 98676dda93cSYan, Zheng 9879babda9fSNikolay Borisov if (snap_src) 9889babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 9899babda9fSNikolay Borisov else 99070dc55f4SOmar Sandoval error = create_subvol(mnt_userns, dir, dentry, inherit); 9919babda9fSNikolay Borisov 99276dda93cSYan, Zheng if (!error) 99376dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 99476dda93cSYan, Zheng out_up_read: 9950b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 996cb8e7090SChristoph Hellwig out_dput: 997cb8e7090SChristoph Hellwig dput(dentry); 998cb8e7090SChristoph Hellwig out_unlock: 99964708539SJosef Bacik btrfs_inode_unlock(dir, 0); 1000cb8e7090SChristoph Hellwig return error; 1001cb8e7090SChristoph Hellwig } 1002cb8e7090SChristoph Hellwig 1003c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 10044d4340c9SChristian Brauner struct user_namespace *mnt_userns, 1005c11fbb6eSRobbie Ko const char *name, int namelen, 1006c11fbb6eSRobbie Ko struct btrfs_root *root, 1007c11fbb6eSRobbie Ko bool readonly, 1008c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 1009c11fbb6eSRobbie Ko { 1010c11fbb6eSRobbie Ko int ret; 1011c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 1012c11fbb6eSRobbie Ko 1013c11fbb6eSRobbie Ko /* 1014c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 1015c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 1016c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 1017c11fbb6eSRobbie Ko */ 1018c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 1019c11fbb6eSRobbie Ko 1020f9baa501SFilipe Manana ret = btrfs_start_delalloc_snapshot(root, false); 1021c11fbb6eSRobbie Ko if (ret) 1022c11fbb6eSRobbie Ko goto out; 1023c11fbb6eSRobbie Ko 1024c11fbb6eSRobbie Ko /* 1025c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 1026c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 1027c11fbb6eSRobbie Ko * creation. 1028c11fbb6eSRobbie Ko */ 1029c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 1030c11fbb6eSRobbie Ko snapshot_force_cow = true; 1031c11fbb6eSRobbie Ko 1032c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 1033c11fbb6eSRobbie Ko 10344d4340c9SChristian Brauner ret = btrfs_mksubvol(parent, mnt_userns, name, namelen, 1035c11fbb6eSRobbie Ko root, readonly, inherit); 1036c11fbb6eSRobbie Ko out: 1037c11fbb6eSRobbie Ko if (snapshot_force_cow) 1038c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 1039c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 1040c11fbb6eSRobbie Ko return ret; 1041c11fbb6eSRobbie Ko } 1042c11fbb6eSRobbie Ko 1043d5633b0dSQu Wenruo /* 104417aaa434SDavid Sterba * Try to start exclusive operation @type or cancel it if it's running. 104517aaa434SDavid Sterba * 104617aaa434SDavid Sterba * Return: 104717aaa434SDavid Sterba * 0 - normal mode, newly claimed op started 104817aaa434SDavid Sterba * >0 - normal mode, something else is running, 104917aaa434SDavid Sterba * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space 105017aaa434SDavid Sterba * ECANCELED - cancel mode, successful cancel 105117aaa434SDavid Sterba * ENOTCONN - cancel mode, operation not running anymore 105217aaa434SDavid Sterba */ 105317aaa434SDavid Sterba static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info, 105417aaa434SDavid Sterba enum btrfs_exclusive_operation type, bool cancel) 105517aaa434SDavid Sterba { 105617aaa434SDavid Sterba if (!cancel) { 105717aaa434SDavid Sterba /* Start normal op */ 105817aaa434SDavid Sterba if (!btrfs_exclop_start(fs_info, type)) 105917aaa434SDavid Sterba return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 106017aaa434SDavid Sterba /* Exclusive operation is now claimed */ 106117aaa434SDavid Sterba return 0; 106217aaa434SDavid Sterba } 106317aaa434SDavid Sterba 106417aaa434SDavid Sterba /* Cancel running op */ 106517aaa434SDavid Sterba if (btrfs_exclop_start_try_lock(fs_info, type)) { 106617aaa434SDavid Sterba /* 106717aaa434SDavid Sterba * This blocks any exclop finish from setting it to NONE, so we 106817aaa434SDavid Sterba * request cancellation. Either it runs and we will wait for it, 106917aaa434SDavid Sterba * or it has finished and no waiting will happen. 107017aaa434SDavid Sterba */ 107117aaa434SDavid Sterba atomic_inc(&fs_info->reloc_cancel_req); 107217aaa434SDavid Sterba btrfs_exclop_start_unlock(fs_info); 107317aaa434SDavid Sterba 107417aaa434SDavid Sterba if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags)) 107517aaa434SDavid Sterba wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING, 107617aaa434SDavid Sterba TASK_INTERRUPTIBLE); 107717aaa434SDavid Sterba 107817aaa434SDavid Sterba return -ECANCELED; 107917aaa434SDavid Sterba } 108017aaa434SDavid Sterba 108117aaa434SDavid Sterba /* Something else is running or none */ 108217aaa434SDavid Sterba return -ENOTCONN; 108317aaa434SDavid Sterba } 108417aaa434SDavid Sterba 1085198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 108676dda93cSYan, Zheng void __user *arg) 1087f46b5a66SChristoph Hellwig { 1088562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 10890b246afaSJeff Mahoney struct inode *inode = file_inode(file); 10900b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1091f46b5a66SChristoph Hellwig u64 new_size; 1092f46b5a66SChristoph Hellwig u64 old_size; 1093f46b5a66SChristoph Hellwig u64 devid = 1; 10940b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1095f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1096f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1097f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1098f46b5a66SChristoph Hellwig char *sizestr; 10999a40f122SGui Hecheng char *retptr; 1100f46b5a66SChristoph Hellwig char *devstr = NULL; 1101f46b5a66SChristoph Hellwig int ret = 0; 1102f46b5a66SChristoph Hellwig int mod = 0; 1103bb059a37SDavid Sterba bool cancel; 1104f46b5a66SChristoph Hellwig 1105e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1106e441d54dSChris Mason return -EPERM; 1107e441d54dSChris Mason 1108198605a8SMiao Xie ret = mnt_want_write_file(file); 1109198605a8SMiao Xie if (ret) 1110198605a8SMiao Xie return ret; 1111198605a8SMiao Xie 1112bb059a37SDavid Sterba /* 1113bb059a37SDavid Sterba * Read the arguments before checking exclusivity to be able to 1114bb059a37SDavid Sterba * distinguish regular resize and cancel 1115bb059a37SDavid Sterba */ 1116dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1117c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1118c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1119bb059a37SDavid Sterba goto out_drop; 1120c9e9f97bSIlya Dryomov } 11215516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1122f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1123bb059a37SDavid Sterba cancel = (strcmp("cancel", sizestr) == 0); 1124bb059a37SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel); 1125bb059a37SDavid Sterba if (ret) 1126bb059a37SDavid Sterba goto out_free; 1127bb059a37SDavid Sterba /* Exclusive operation is now claimed */ 1128bb059a37SDavid Sterba 1129f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1130f46b5a66SChristoph Hellwig if (devstr) { 1131f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1132f46b5a66SChristoph Hellwig *devstr = '\0'; 1133f46b5a66SChristoph Hellwig devstr = vol_args->name; 113458dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 113558dfae63SZhangZhen if (ret) 1136bb059a37SDavid Sterba goto out_finish; 1137dfd79829SMiao Xie if (!devid) { 1138dfd79829SMiao Xie ret = -EINVAL; 1139bb059a37SDavid Sterba goto out_finish; 1140dfd79829SMiao Xie } 11410b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1142f46b5a66SChristoph Hellwig } 1143dba60f3fSMiao Xie 1144562d7b15SJosef Bacik args.devid = devid; 1145562d7b15SJosef Bacik device = btrfs_find_device(fs_info->fs_devices, &args); 1146f46b5a66SChristoph Hellwig if (!device) { 11470b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1148c1c9ff7cSGeert Uytterhoeven devid); 1149dfd79829SMiao Xie ret = -ENODEV; 1150bb059a37SDavid Sterba goto out_finish; 1151f46b5a66SChristoph Hellwig } 1152dba60f3fSMiao Xie 1153ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 11540b246afaSJeff Mahoney btrfs_info(fs_info, 1155efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1156c1c9ff7cSGeert Uytterhoeven devid); 1157dfd79829SMiao Xie ret = -EPERM; 1158bb059a37SDavid Sterba goto out_finish; 11594e42ae1bSLiu Bo } 11604e42ae1bSLiu Bo 1161f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1162cda00ebaSChristoph Hellwig new_size = bdev_nr_bytes(device->bdev); 1163f46b5a66SChristoph Hellwig else { 1164f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1165f46b5a66SChristoph Hellwig mod = -1; 1166f46b5a66SChristoph Hellwig sizestr++; 1167f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1168f46b5a66SChristoph Hellwig mod = 1; 1169f46b5a66SChristoph Hellwig sizestr++; 1170f46b5a66SChristoph Hellwig } 11719a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 11729a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1173f46b5a66SChristoph Hellwig ret = -EINVAL; 1174bb059a37SDavid Sterba goto out_finish; 1175f46b5a66SChristoph Hellwig } 1176f46b5a66SChristoph Hellwig } 1177f46b5a66SChristoph Hellwig 1178401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1179dfd79829SMiao Xie ret = -EPERM; 1180bb059a37SDavid Sterba goto out_finish; 118163a212abSStefan Behrens } 118263a212abSStefan Behrens 11837cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1184f46b5a66SChristoph Hellwig 1185f46b5a66SChristoph Hellwig if (mod < 0) { 1186f46b5a66SChristoph Hellwig if (new_size > old_size) { 1187f46b5a66SChristoph Hellwig ret = -EINVAL; 1188bb059a37SDavid Sterba goto out_finish; 1189f46b5a66SChristoph Hellwig } 1190f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1191f46b5a66SChristoph Hellwig } else if (mod > 0) { 1192eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1193902c68a4SGui Hecheng ret = -ERANGE; 1194bb059a37SDavid Sterba goto out_finish; 1195eb8052e0SWenliang Fan } 1196f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1197f46b5a66SChristoph Hellwig } 1198f46b5a66SChristoph Hellwig 1199ee22184bSByongho Lee if (new_size < SZ_256M) { 1200f46b5a66SChristoph Hellwig ret = -EINVAL; 1201bb059a37SDavid Sterba goto out_finish; 1202f46b5a66SChristoph Hellwig } 1203cda00ebaSChristoph Hellwig if (new_size > bdev_nr_bytes(device->bdev)) { 1204f46b5a66SChristoph Hellwig ret = -EFBIG; 1205bb059a37SDavid Sterba goto out_finish; 1206f46b5a66SChristoph Hellwig } 1207f46b5a66SChristoph Hellwig 120847f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1209f46b5a66SChristoph Hellwig 1210f46b5a66SChristoph Hellwig if (new_size > old_size) { 1211a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 121298d5dc13STsutomu Itoh if (IS_ERR(trans)) { 121398d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1214bb059a37SDavid Sterba goto out_finish; 121598d5dc13STsutomu Itoh } 1216f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 12173a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1218ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1219f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 12200253f40eSjeff.liu } /* equal, nothing need to do */ 1221f46b5a66SChristoph Hellwig 1222faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1223faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1224faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1225faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 1226faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1227bb059a37SDavid Sterba out_finish: 1228bb059a37SDavid Sterba btrfs_exclop_finish(fs_info); 1229c9e9f97bSIlya Dryomov out_free: 1230f46b5a66SChristoph Hellwig kfree(vol_args); 1231bb059a37SDavid Sterba out_drop: 123218f39c41SIlya Dryomov mnt_drop_write_file(file); 1233f46b5a66SChristoph Hellwig return ret; 1234f46b5a66SChristoph Hellwig } 1235f46b5a66SChristoph Hellwig 12365d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 12374d4340c9SChristian Brauner struct user_namespace *mnt_userns, 123852f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 12395d54c67eSNikolay Borisov bool readonly, 12408696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1241f46b5a66SChristoph Hellwig { 1242f46b5a66SChristoph Hellwig int namelen; 12433de4586cSChris Mason int ret = 0; 1244f46b5a66SChristoph Hellwig 1245325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1246325c50e3SJeff Mahoney return -ENOTDIR; 1247325c50e3SJeff Mahoney 1248a874a63eSLiu Bo ret = mnt_want_write_file(file); 1249a874a63eSLiu Bo if (ret) 1250a874a63eSLiu Bo goto out; 1251a874a63eSLiu Bo 125272fd032eSSage Weil namelen = strlen(name); 125372fd032eSSage Weil if (strchr(name, '/')) { 1254f46b5a66SChristoph Hellwig ret = -EINVAL; 1255a874a63eSLiu Bo goto out_drop_write; 1256f46b5a66SChristoph Hellwig } 1257f46b5a66SChristoph Hellwig 125816780cabSChris Mason if (name[0] == '.' && 125916780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 126016780cabSChris Mason ret = -EEXIST; 1261a874a63eSLiu Bo goto out_drop_write; 126216780cabSChris Mason } 126316780cabSChris Mason 12643de4586cSChris Mason if (subvol) { 12654d4340c9SChristian Brauner ret = btrfs_mksubvol(&file->f_path, mnt_userns, name, 12664d4340c9SChristian Brauner namelen, NULL, readonly, inherit); 1267cb8e7090SChristoph Hellwig } else { 12682903ff01SAl Viro struct fd src = fdget(fd); 12693de4586cSChris Mason struct inode *src_inode; 12702903ff01SAl Viro if (!src.file) { 12713de4586cSChris Mason ret = -EINVAL; 1272a874a63eSLiu Bo goto out_drop_write; 12733de4586cSChris Mason } 12743de4586cSChris Mason 1275496ad9aaSAl Viro src_inode = file_inode(src.file); 1276496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1277c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1278efe120a0SFrank Holton "Snapshot src from another FS"); 127923ad5b17SKusanagi Kouichi ret = -EXDEV; 12804d4340c9SChristian Brauner } else if (!inode_owner_or_capable(mnt_userns, src_inode)) { 1281d0242061SDavid Sterba /* 1282d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1283d0242061SDavid Sterba * are limited to own subvolumes only 1284d0242061SDavid Sterba */ 1285d0242061SDavid Sterba ret = -EPERM; 1286ecd18815SAl Viro } else { 12874d4340c9SChristian Brauner ret = btrfs_mksnapshot(&file->f_path, mnt_userns, 12884d4340c9SChristian Brauner name, namelen, 128972fd032eSSage Weil BTRFS_I(src_inode)->root, 12905d54c67eSNikolay Borisov readonly, inherit); 1291ecd18815SAl Viro } 12922903ff01SAl Viro fdput(src); 1293cb8e7090SChristoph Hellwig } 1294a874a63eSLiu Bo out_drop_write: 1295a874a63eSLiu Bo mnt_drop_write_file(file); 1296f46b5a66SChristoph Hellwig out: 129772fd032eSSage Weil return ret; 129872fd032eSSage Weil } 129972fd032eSSage Weil 130072fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1301fa0d2b9bSLi Zefan void __user *arg, int subvol) 130272fd032eSSage Weil { 1303fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 130472fd032eSSage Weil int ret; 130572fd032eSSage Weil 1306325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1307325c50e3SJeff Mahoney return -ENOTDIR; 1308325c50e3SJeff Mahoney 1309fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1310fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1311fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1312fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1313fa0d2b9bSLi Zefan 13144d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 13154d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 13164d4340c9SChristian Brauner false, NULL); 1317fa0d2b9bSLi Zefan 1318fa0d2b9bSLi Zefan kfree(vol_args); 1319fa0d2b9bSLi Zefan return ret; 1320fa0d2b9bSLi Zefan } 1321fa0d2b9bSLi Zefan 1322fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1323fa0d2b9bSLi Zefan void __user *arg, int subvol) 1324fa0d2b9bSLi Zefan { 1325fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1326fa0d2b9bSLi Zefan int ret; 1327b83cc969SLi Zefan bool readonly = false; 13286f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 132972fd032eSSage Weil 1330325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1331325c50e3SJeff Mahoney return -ENOTDIR; 1332325c50e3SJeff Mahoney 1333fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1334fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1335fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1336fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1337fdfb1e4fSLi Zefan 1338673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 1339b83cc969SLi Zefan ret = -EOPNOTSUPP; 1340c47ca32dSDan Carpenter goto free_args; 1341fdfb1e4fSLi Zefan } 1342fdfb1e4fSLi Zefan 1343b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1344b83cc969SLi Zefan readonly = true; 13456f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 13465011c5a6SDan Carpenter u64 nums; 13475011c5a6SDan Carpenter 13485011c5a6SDan Carpenter if (vol_args->size < sizeof(*inherit) || 13495011c5a6SDan Carpenter vol_args->size > PAGE_SIZE) { 13506f72c7e2SArne Jansen ret = -EINVAL; 1351c47ca32dSDan Carpenter goto free_args; 13526f72c7e2SArne Jansen } 13536f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 13546f72c7e2SArne Jansen if (IS_ERR(inherit)) { 13556f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1356c47ca32dSDan Carpenter goto free_args; 13576f72c7e2SArne Jansen } 13585011c5a6SDan Carpenter 13595011c5a6SDan Carpenter if (inherit->num_qgroups > PAGE_SIZE || 13605011c5a6SDan Carpenter inherit->num_ref_copies > PAGE_SIZE || 13615011c5a6SDan Carpenter inherit->num_excl_copies > PAGE_SIZE) { 13625011c5a6SDan Carpenter ret = -EINVAL; 13635011c5a6SDan Carpenter goto free_inherit; 13645011c5a6SDan Carpenter } 13655011c5a6SDan Carpenter 13665011c5a6SDan Carpenter nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + 13675011c5a6SDan Carpenter 2 * inherit->num_excl_copies; 13685011c5a6SDan Carpenter if (vol_args->size != struct_size(inherit, qgroups, nums)) { 13695011c5a6SDan Carpenter ret = -EINVAL; 13705011c5a6SDan Carpenter goto free_inherit; 13715011c5a6SDan Carpenter } 13726f72c7e2SArne Jansen } 137375eaa0e2SSage Weil 13744d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 13754d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 13764d4340c9SChristian Brauner readonly, inherit); 1377c47ca32dSDan Carpenter if (ret) 1378c47ca32dSDan Carpenter goto free_inherit; 1379c47ca32dSDan Carpenter free_inherit: 13806f72c7e2SArne Jansen kfree(inherit); 1381c47ca32dSDan Carpenter free_args: 1382c47ca32dSDan Carpenter kfree(vol_args); 1383f46b5a66SChristoph Hellwig return ret; 1384f46b5a66SChristoph Hellwig } 1385f46b5a66SChristoph Hellwig 13869ad12305SSahil Kang static noinline int btrfs_ioctl_subvol_getflags(struct inode *inode, 13870caa102dSLi Zefan void __user *arg) 13880caa102dSLi Zefan { 13890b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 13900caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 13910caa102dSLi Zefan int ret = 0; 13920caa102dSLi Zefan u64 flags = 0; 13930caa102dSLi Zefan 13944a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 13950caa102dSLi Zefan return -EINVAL; 13960caa102dSLi Zefan 13970b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 13980caa102dSLi Zefan if (btrfs_root_readonly(root)) 13990caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 14000b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 14010caa102dSLi Zefan 14020caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 14030caa102dSLi Zefan ret = -EFAULT; 14040caa102dSLi Zefan 14050caa102dSLi Zefan return ret; 14060caa102dSLi Zefan } 14070caa102dSLi Zefan 14080caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 14090caa102dSLi Zefan void __user *arg) 14100caa102dSLi Zefan { 1411496ad9aaSAl Viro struct inode *inode = file_inode(file); 14120b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 14130caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 14140caa102dSLi Zefan struct btrfs_trans_handle *trans; 14150caa102dSLi Zefan u64 root_flags; 14160caa102dSLi Zefan u64 flags; 14170caa102dSLi Zefan int ret = 0; 14180caa102dSLi Zefan 141939e1674fSChristian Brauner if (!inode_owner_or_capable(file_mnt_user_ns(file), inode)) 1420bd60ea0fSDavid Sterba return -EPERM; 1421bd60ea0fSDavid Sterba 1422b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1423b9ca0664SLiu Bo if (ret) 1424b9ca0664SLiu Bo goto out; 14250caa102dSLi Zefan 14264a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 1427b9ca0664SLiu Bo ret = -EINVAL; 1428b9ca0664SLiu Bo goto out_drop_write; 1429b9ca0664SLiu Bo } 14300caa102dSLi Zefan 1431b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1432b9ca0664SLiu Bo ret = -EFAULT; 1433b9ca0664SLiu Bo goto out_drop_write; 1434b9ca0664SLiu Bo } 14350caa102dSLi Zefan 1436b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1437b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1438b9ca0664SLiu Bo goto out_drop_write; 1439b9ca0664SLiu Bo } 14400caa102dSLi Zefan 14410b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 14420caa102dSLi Zefan 14430caa102dSLi Zefan /* nothing to do */ 14440caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1445b9ca0664SLiu Bo goto out_drop_sem; 14460caa102dSLi Zefan 14470caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 14482c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 14490caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 14500caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 14512c686537SDavid Sterba } else { 14522c686537SDavid Sterba /* 14532c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 14542c686537SDavid Sterba * send 14552c686537SDavid Sterba */ 14562c686537SDavid Sterba spin_lock(&root->root_item_lock); 14572c686537SDavid Sterba if (root->send_in_progress == 0) { 14580caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 14590caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 14602c686537SDavid Sterba spin_unlock(&root->root_item_lock); 14612c686537SDavid Sterba } else { 14622c686537SDavid Sterba spin_unlock(&root->root_item_lock); 14630b246afaSJeff Mahoney btrfs_warn(fs_info, 14642c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 14652c686537SDavid Sterba root->root_key.objectid); 14662c686537SDavid Sterba ret = -EPERM; 14672c686537SDavid Sterba goto out_drop_sem; 14682c686537SDavid Sterba } 14692c686537SDavid Sterba } 14700caa102dSLi Zefan 14710caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 14720caa102dSLi Zefan if (IS_ERR(trans)) { 14730caa102dSLi Zefan ret = PTR_ERR(trans); 14740caa102dSLi Zefan goto out_reset; 14750caa102dSLi Zefan } 14760caa102dSLi Zefan 14770b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 14780caa102dSLi Zefan &root->root_key, &root->root_item); 14799417ebc8SNikolay Borisov if (ret < 0) { 14809417ebc8SNikolay Borisov btrfs_end_transaction(trans); 14819417ebc8SNikolay Borisov goto out_reset; 14829417ebc8SNikolay Borisov } 14830caa102dSLi Zefan 14849417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 14859417ebc8SNikolay Borisov 14860caa102dSLi Zefan out_reset: 14870caa102dSLi Zefan if (ret) 14880caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1489b9ca0664SLiu Bo out_drop_sem: 14900b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 1491b9ca0664SLiu Bo out_drop_write: 1492b9ca0664SLiu Bo mnt_drop_write_file(file); 1493b9ca0664SLiu Bo out: 14940caa102dSLi Zefan return ret; 14950caa102dSLi Zefan } 14960caa102dSLi Zefan 1497ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1498ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1499ac8e9819SChris Mason { 1500abc6e134SChris Mason struct btrfs_key test; 1501abc6e134SChris Mason int ret; 1502abc6e134SChris Mason 1503abc6e134SChris Mason test.objectid = sk->min_objectid; 1504abc6e134SChris Mason test.type = sk->min_type; 1505abc6e134SChris Mason test.offset = sk->min_offset; 1506abc6e134SChris Mason 1507abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1508abc6e134SChris Mason if (ret < 0) 1509ac8e9819SChris Mason return 0; 1510abc6e134SChris Mason 1511abc6e134SChris Mason test.objectid = sk->max_objectid; 1512abc6e134SChris Mason test.type = sk->max_type; 1513abc6e134SChris Mason test.offset = sk->max_offset; 1514abc6e134SChris Mason 1515abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1516abc6e134SChris Mason if (ret > 0) 1517ac8e9819SChris Mason return 0; 1518ac8e9819SChris Mason return 1; 1519ac8e9819SChris Mason } 1520ac8e9819SChris Mason 1521df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 1522ac8e9819SChris Mason struct btrfs_key *key, 1523ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 15249b6e817dSGerhard Heift size_t *buf_size, 1525ba346b35SGerhard Heift char __user *ubuf, 1526ac8e9819SChris Mason unsigned long *sk_offset, 1527ac8e9819SChris Mason int *num_found) 1528ac8e9819SChris Mason { 1529ac8e9819SChris Mason u64 found_transid; 1530ac8e9819SChris Mason struct extent_buffer *leaf; 1531ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1532dd81d459SNaohiro Aota struct btrfs_key test; 1533ac8e9819SChris Mason unsigned long item_off; 1534ac8e9819SChris Mason unsigned long item_len; 1535ac8e9819SChris Mason int nritems; 1536ac8e9819SChris Mason int i; 1537ac8e9819SChris Mason int slot; 1538ac8e9819SChris Mason int ret = 0; 1539ac8e9819SChris Mason 1540ac8e9819SChris Mason leaf = path->nodes[0]; 1541ac8e9819SChris Mason slot = path->slots[0]; 1542ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1543ac8e9819SChris Mason 1544ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1545ac8e9819SChris Mason i = nritems; 1546ac8e9819SChris Mason goto advance_key; 1547ac8e9819SChris Mason } 1548ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1549ac8e9819SChris Mason 1550ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1551ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 15523212fa14SJosef Bacik item_len = btrfs_item_size(leaf, i); 1553ac8e9819SChris Mason 155403b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 155503b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 155603b71c6cSGabriel de Perthuis continue; 155703b71c6cSGabriel de Perthuis 15589b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 15598f5f6178SGerhard Heift if (*num_found) { 1560ac8e9819SChris Mason ret = 1; 15618f5f6178SGerhard Heift goto out; 15628f5f6178SGerhard Heift } 15638f5f6178SGerhard Heift 15648f5f6178SGerhard Heift /* 15658f5f6178SGerhard Heift * return one empty item back for v1, which does not 15668f5f6178SGerhard Heift * handle -EOVERFLOW 15678f5f6178SGerhard Heift */ 15688f5f6178SGerhard Heift 15699b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 1570ac8e9819SChris Mason item_len = 0; 15718f5f6178SGerhard Heift ret = -EOVERFLOW; 15728f5f6178SGerhard Heift } 1573ac8e9819SChris Mason 15749b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 1575ac8e9819SChris Mason ret = 1; 157625c9bc2eSGerhard Heift goto out; 1577ac8e9819SChris Mason } 1578ac8e9819SChris Mason 1579ac8e9819SChris Mason sh.objectid = key->objectid; 1580ac8e9819SChris Mason sh.offset = key->offset; 1581ac8e9819SChris Mason sh.type = key->type; 1582ac8e9819SChris Mason sh.len = item_len; 1583ac8e9819SChris Mason sh.transid = found_transid; 1584ac8e9819SChris Mason 1585a48b73ecSJosef Bacik /* 1586a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 1587a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 1588a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 1589a48b73ecSJosef Bacik * properly this next time through 1590a48b73ecSJosef Bacik */ 1591a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 1592a48b73ecSJosef Bacik ret = 0; 1593ba346b35SGerhard Heift goto out; 1594ba346b35SGerhard Heift } 1595ba346b35SGerhard Heift 1596ac8e9819SChris Mason *sk_offset += sizeof(sh); 1597ac8e9819SChris Mason 1598ac8e9819SChris Mason if (item_len) { 1599ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 1600a48b73ecSJosef Bacik /* 1601a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 1602a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 1603a48b73ecSJosef Bacik */ 1604a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 1605ba346b35SGerhard Heift item_off, item_len)) { 1606a48b73ecSJosef Bacik ret = 0; 1607a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 1608ba346b35SGerhard Heift goto out; 1609ba346b35SGerhard Heift } 1610ba346b35SGerhard Heift 1611ac8e9819SChris Mason *sk_offset += item_len; 1612ac8e9819SChris Mason } 1613e2156867SHugo Mills (*num_found)++; 1614ac8e9819SChris Mason 16158f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 16168f5f6178SGerhard Heift goto out; 16178f5f6178SGerhard Heift 161825c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 161925c9bc2eSGerhard Heift ret = 1; 162025c9bc2eSGerhard Heift goto out; 162125c9bc2eSGerhard Heift } 1622ac8e9819SChris Mason } 1623ac8e9819SChris Mason advance_key: 1624ac8e9819SChris Mason ret = 0; 1625dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 1626dd81d459SNaohiro Aota test.type = sk->max_type; 1627dd81d459SNaohiro Aota test.offset = sk->max_offset; 1628dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 1629dd81d459SNaohiro Aota ret = 1; 1630dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 1631abc6e134SChris Mason key->offset++; 1632dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 1633abc6e134SChris Mason key->offset = 0; 1634abc6e134SChris Mason key->type++; 1635dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 1636abc6e134SChris Mason key->offset = 0; 1637abc6e134SChris Mason key->type = 0; 1638abc6e134SChris Mason key->objectid++; 1639abc6e134SChris Mason } else 1640abc6e134SChris Mason ret = 1; 164125c9bc2eSGerhard Heift out: 1642ba346b35SGerhard Heift /* 1643ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 1644ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 1645ba346b35SGerhard Heift * * all items were found 1646ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 1647ba346b35SGerhard Heift * leaf 1648ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 1649ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 1650ba346b35SGerhard Heift */ 1651ac8e9819SChris Mason return ret; 1652ac8e9819SChris Mason } 1653ac8e9819SChris Mason 1654ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 165512544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 16569b6e817dSGerhard Heift size_t *buf_size, 1657ba346b35SGerhard Heift char __user *ubuf) 1658ac8e9819SChris Mason { 16590b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 1660ac8e9819SChris Mason struct btrfs_root *root; 1661ac8e9819SChris Mason struct btrfs_key key; 1662ac8e9819SChris Mason struct btrfs_path *path; 1663ac8e9819SChris Mason int ret; 1664ac8e9819SChris Mason int num_found = 0; 1665ac8e9819SChris Mason unsigned long sk_offset = 0; 1666ac8e9819SChris Mason 16679b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 16689b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 166912544442SGerhard Heift return -EOVERFLOW; 16709b6e817dSGerhard Heift } 167112544442SGerhard Heift 1672ac8e9819SChris Mason path = btrfs_alloc_path(); 1673ac8e9819SChris Mason if (!path) 1674ac8e9819SChris Mason return -ENOMEM; 1675ac8e9819SChris Mason 1676ac8e9819SChris Mason if (sk->tree_id == 0) { 1677ac8e9819SChris Mason /* search the root of the inode that was passed */ 167800246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 1679ac8e9819SChris Mason } else { 168056e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 1681ac8e9819SChris Mason if (IS_ERR(root)) { 1682ac8e9819SChris Mason btrfs_free_path(path); 1683ad1e3d56SMisono Tomohiro return PTR_ERR(root); 1684ac8e9819SChris Mason } 1685ac8e9819SChris Mason } 1686ac8e9819SChris Mason 1687ac8e9819SChris Mason key.objectid = sk->min_objectid; 1688ac8e9819SChris Mason key.type = sk->min_type; 1689ac8e9819SChris Mason key.offset = sk->min_offset; 1690ac8e9819SChris Mason 1691ac8e9819SChris Mason while (1) { 1692bb523b40SAndreas Gruenbacher ret = -EFAULT; 169318788e34SCatalin Marinas /* 169418788e34SCatalin Marinas * Ensure that the whole user buffer is faulted in at sub-page 169518788e34SCatalin Marinas * granularity, otherwise the loop may live-lock. 169618788e34SCatalin Marinas */ 169718788e34SCatalin Marinas if (fault_in_subpage_writeable(ubuf + sk_offset, 169818788e34SCatalin Marinas *buf_size - sk_offset)) 1699a48b73ecSJosef Bacik break; 1700a48b73ecSJosef Bacik 17016174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 1702ac8e9819SChris Mason if (ret != 0) { 1703ac8e9819SChris Mason if (ret > 0) 1704ac8e9819SChris Mason ret = 0; 1705ac8e9819SChris Mason goto err; 1706ac8e9819SChris Mason } 1707df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 1708ac8e9819SChris Mason &sk_offset, &num_found); 1709b3b4aa74SDavid Sterba btrfs_release_path(path); 171025c9bc2eSGerhard Heift if (ret) 1711ac8e9819SChris Mason break; 1712ac8e9819SChris Mason 1713ac8e9819SChris Mason } 17148f5f6178SGerhard Heift if (ret > 0) 1715ac8e9819SChris Mason ret = 0; 1716ac8e9819SChris Mason err: 1717ac8e9819SChris Mason sk->nr_items = num_found; 171800246528SJosef Bacik btrfs_put_root(root); 1719ac8e9819SChris Mason btrfs_free_path(path); 1720ac8e9819SChris Mason return ret; 1721ac8e9819SChris Mason } 1722ac8e9819SChris Mason 17239ad12305SSahil Kang static noinline int btrfs_ioctl_tree_search(struct inode *inode, 1724ac8e9819SChris Mason void __user *argp) 1725ac8e9819SChris Mason { 17260d031dc4SYu Zhe struct btrfs_ioctl_search_args __user *uargs = argp; 1727ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 1728ac8e9819SChris Mason int ret; 17299b6e817dSGerhard Heift size_t buf_size; 1730ac8e9819SChris Mason 1731ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1732ac8e9819SChris Mason return -EPERM; 1733ac8e9819SChris Mason 1734ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 1735ba346b35SGerhard Heift return -EFAULT; 1736ba346b35SGerhard Heift 1737ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 1738ac8e9819SChris Mason 1739ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 17408f5f6178SGerhard Heift 17418f5f6178SGerhard Heift /* 17428f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 17438f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 17448f5f6178SGerhard Heift */ 17458f5f6178SGerhard Heift if (ret == -EOVERFLOW) 17468f5f6178SGerhard Heift ret = 0; 17478f5f6178SGerhard Heift 1748ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 1749ac8e9819SChris Mason ret = -EFAULT; 1750ac8e9819SChris Mason return ret; 1751ac8e9819SChris Mason } 1752ac8e9819SChris Mason 17539ad12305SSahil Kang static noinline int btrfs_ioctl_tree_search_v2(struct inode *inode, 1754cc68a8a5SGerhard Heift void __user *argp) 1755cc68a8a5SGerhard Heift { 17560d031dc4SYu Zhe struct btrfs_ioctl_search_args_v2 __user *uarg = argp; 1757cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 1758cc68a8a5SGerhard Heift int ret; 1759cc68a8a5SGerhard Heift size_t buf_size; 1760ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 1761cc68a8a5SGerhard Heift 1762cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 1763cc68a8a5SGerhard Heift return -EPERM; 1764cc68a8a5SGerhard Heift 1765cc68a8a5SGerhard Heift /* copy search header and buffer size */ 1766cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 1767cc68a8a5SGerhard Heift return -EFAULT; 1768cc68a8a5SGerhard Heift 1769cc68a8a5SGerhard Heift buf_size = args.buf_size; 1770cc68a8a5SGerhard Heift 1771cc68a8a5SGerhard Heift /* limit result size to 16MB */ 1772cc68a8a5SGerhard Heift if (buf_size > buf_limit) 1773cc68a8a5SGerhard Heift buf_size = buf_limit; 1774cc68a8a5SGerhard Heift 1775cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 1776718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 1777cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 1778cc68a8a5SGerhard Heift ret = -EFAULT; 1779cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 1780cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 1781cc68a8a5SGerhard Heift ret = -EFAULT; 1782cc68a8a5SGerhard Heift 178376dda93cSYan, Zheng return ret; 178476dda93cSYan, Zheng } 178576dda93cSYan, Zheng 178698d377a0STARUISI Hiroaki /* 1787ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1788ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 178998d377a0STARUISI Hiroaki */ 179098d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 179198d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 179298d377a0STARUISI Hiroaki { 179398d377a0STARUISI Hiroaki struct btrfs_root *root; 179498d377a0STARUISI Hiroaki struct btrfs_key key; 1795ac8e9819SChris Mason char *ptr; 179698d377a0STARUISI Hiroaki int ret = -1; 179798d377a0STARUISI Hiroaki int slot; 179898d377a0STARUISI Hiroaki int len; 179998d377a0STARUISI Hiroaki int total_len = 0; 180098d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 180198d377a0STARUISI Hiroaki struct extent_buffer *l; 180298d377a0STARUISI Hiroaki struct btrfs_path *path; 180398d377a0STARUISI Hiroaki 180498d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 180598d377a0STARUISI Hiroaki name[0]='\0'; 180698d377a0STARUISI Hiroaki return 0; 180798d377a0STARUISI Hiroaki } 180898d377a0STARUISI Hiroaki 180998d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 181098d377a0STARUISI Hiroaki if (!path) 181198d377a0STARUISI Hiroaki return -ENOMEM; 181298d377a0STARUISI Hiroaki 1813c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 181498d377a0STARUISI Hiroaki 181556e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 181698d377a0STARUISI Hiroaki if (IS_ERR(root)) { 1817ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 181888234012SJosef Bacik root = NULL; 181988234012SJosef Bacik goto out; 182088234012SJosef Bacik } 182198d377a0STARUISI Hiroaki 182298d377a0STARUISI Hiroaki key.objectid = dirid; 182398d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 18248ad6fcabSChris Mason key.offset = (u64)-1; 182598d377a0STARUISI Hiroaki 182698d377a0STARUISI Hiroaki while (1) { 18270ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 182818674c6cSFilipe David Borba Manana if (ret < 0) 182918674c6cSFilipe David Borba Manana goto out; 183018674c6cSFilipe David Borba Manana else if (ret > 0) { 1831ac8e9819SChris Mason ret = -ENOENT; 183298d377a0STARUISI Hiroaki goto out; 1833ac8e9819SChris Mason } 183418674c6cSFilipe David Borba Manana 183518674c6cSFilipe David Borba Manana l = path->nodes[0]; 183618674c6cSFilipe David Borba Manana slot = path->slots[0]; 183798d377a0STARUISI Hiroaki 183898d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 183998d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 184098d377a0STARUISI Hiroaki ptr -= len + 1; 184198d377a0STARUISI Hiroaki total_len += len + 1; 1842a696cf35SFilipe David Borba Manana if (ptr < name) { 1843a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 184498d377a0STARUISI Hiroaki goto out; 1845a696cf35SFilipe David Borba Manana } 184698d377a0STARUISI Hiroaki 184798d377a0STARUISI Hiroaki *(ptr + len) = '/'; 184898d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 184998d377a0STARUISI Hiroaki 185098d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 185198d377a0STARUISI Hiroaki break; 185298d377a0STARUISI Hiroaki 1853b3b4aa74SDavid Sterba btrfs_release_path(path); 185498d377a0STARUISI Hiroaki key.objectid = key.offset; 18558ad6fcabSChris Mason key.offset = (u64)-1; 185698d377a0STARUISI Hiroaki dirid = key.objectid; 185798d377a0STARUISI Hiroaki } 185877906a50SLi Zefan memmove(name, ptr, total_len); 185998d377a0STARUISI Hiroaki name[total_len] = '\0'; 186098d377a0STARUISI Hiroaki ret = 0; 186198d377a0STARUISI Hiroaki out: 186200246528SJosef Bacik btrfs_put_root(root); 186398d377a0STARUISI Hiroaki btrfs_free_path(path); 1864ac8e9819SChris Mason return ret; 1865ac8e9819SChris Mason } 1866ac8e9819SChris Mason 18676623d9a0SChristian Brauner static int btrfs_search_path_in_tree_user(struct user_namespace *mnt_userns, 18686623d9a0SChristian Brauner struct inode *inode, 186923d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 187023d0b79dSTomohiro Misono { 187123d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 187223d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 187323d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 187423d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 187523d0b79dSTomohiro Misono u64 dirid = args->dirid; 187623d0b79dSTomohiro Misono unsigned long item_off; 187723d0b79dSTomohiro Misono unsigned long item_len; 187823d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 187923d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 1880b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 188123d0b79dSTomohiro Misono struct btrfs_path *path; 188223d0b79dSTomohiro Misono struct btrfs_key key, key2; 188323d0b79dSTomohiro Misono struct extent_buffer *leaf; 188423d0b79dSTomohiro Misono struct inode *temp_inode; 188523d0b79dSTomohiro Misono char *ptr; 188623d0b79dSTomohiro Misono int slot; 188723d0b79dSTomohiro Misono int len; 188823d0b79dSTomohiro Misono int total_len = 0; 188923d0b79dSTomohiro Misono int ret; 189023d0b79dSTomohiro Misono 189123d0b79dSTomohiro Misono path = btrfs_alloc_path(); 189223d0b79dSTomohiro Misono if (!path) 189323d0b79dSTomohiro Misono return -ENOMEM; 189423d0b79dSTomohiro Misono 189523d0b79dSTomohiro Misono /* 189623d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 189723d0b79dSTomohiro Misono * construct the path in from the bottom up. 189823d0b79dSTomohiro Misono */ 189923d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 190023d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 190123d0b79dSTomohiro Misono 190256e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 190323d0b79dSTomohiro Misono if (IS_ERR(root)) { 190423d0b79dSTomohiro Misono ret = PTR_ERR(root); 190523d0b79dSTomohiro Misono goto out; 190623d0b79dSTomohiro Misono } 190723d0b79dSTomohiro Misono 190823d0b79dSTomohiro Misono key.objectid = dirid; 190923d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 191023d0b79dSTomohiro Misono key.offset = (u64)-1; 191123d0b79dSTomohiro Misono while (1) { 19120ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 19130ff40a91SMarcos Paulo de Souza if (ret < 0) 1914b8a49ae1SJosef Bacik goto out_put; 19150ff40a91SMarcos Paulo de Souza else if (ret > 0) { 191623d0b79dSTomohiro Misono ret = -ENOENT; 1917b8a49ae1SJosef Bacik goto out_put; 191823d0b79dSTomohiro Misono } 191923d0b79dSTomohiro Misono 192023d0b79dSTomohiro Misono leaf = path->nodes[0]; 192123d0b79dSTomohiro Misono slot = path->slots[0]; 192223d0b79dSTomohiro Misono 192323d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 192423d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 192523d0b79dSTomohiro Misono ptr -= len + 1; 192623d0b79dSTomohiro Misono total_len += len + 1; 192723d0b79dSTomohiro Misono if (ptr < args->path) { 192823d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 1929b8a49ae1SJosef Bacik goto out_put; 193023d0b79dSTomohiro Misono } 193123d0b79dSTomohiro Misono 193223d0b79dSTomohiro Misono *(ptr + len) = '/'; 193323d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 193423d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 193523d0b79dSTomohiro Misono 193623d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 193723d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 193823d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 193923d0b79dSTomohiro Misono if (ret < 0) { 1940b8a49ae1SJosef Bacik goto out_put; 194123d0b79dSTomohiro Misono } else if (ret > 0) { 194223d0b79dSTomohiro Misono ret = -ENOENT; 1943b8a49ae1SJosef Bacik goto out_put; 194423d0b79dSTomohiro Misono } 194523d0b79dSTomohiro Misono 194623d0b79dSTomohiro Misono leaf = path->nodes[0]; 194723d0b79dSTomohiro Misono slot = path->slots[0]; 194823d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 194923d0b79dSTomohiro Misono if (key2.objectid != dirid) { 195023d0b79dSTomohiro Misono ret = -ENOENT; 1951b8a49ae1SJosef Bacik goto out_put; 195223d0b79dSTomohiro Misono } 195323d0b79dSTomohiro Misono 19540202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 19553ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 19563ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 1957b8a49ae1SJosef Bacik goto out_put; 19583ca57bd6SMisono Tomohiro } 19596623d9a0SChristian Brauner ret = inode_permission(mnt_userns, temp_inode, 196047291baaSChristian Brauner MAY_READ | MAY_EXEC); 196123d0b79dSTomohiro Misono iput(temp_inode); 196223d0b79dSTomohiro Misono if (ret) { 196323d0b79dSTomohiro Misono ret = -EACCES; 1964b8a49ae1SJosef Bacik goto out_put; 196523d0b79dSTomohiro Misono } 196623d0b79dSTomohiro Misono 196723d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 196823d0b79dSTomohiro Misono break; 196923d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 197023d0b79dSTomohiro Misono ret = -EACCES; 1971b8a49ae1SJosef Bacik goto out_put; 197223d0b79dSTomohiro Misono } 197323d0b79dSTomohiro Misono 197423d0b79dSTomohiro Misono btrfs_release_path(path); 197523d0b79dSTomohiro Misono key.objectid = key.offset; 197623d0b79dSTomohiro Misono key.offset = (u64)-1; 197723d0b79dSTomohiro Misono dirid = key.objectid; 197823d0b79dSTomohiro Misono } 197923d0b79dSTomohiro Misono 198023d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 198123d0b79dSTomohiro Misono args->path[total_len] = '\0'; 198200246528SJosef Bacik btrfs_put_root(root); 1983b8a49ae1SJosef Bacik root = NULL; 198423d0b79dSTomohiro Misono btrfs_release_path(path); 198523d0b79dSTomohiro Misono } 198623d0b79dSTomohiro Misono 198723d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 198823d0b79dSTomohiro Misono key.objectid = treeid; 198923d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 199023d0b79dSTomohiro Misono key.offset = args->treeid; 1991b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 199223d0b79dSTomohiro Misono if (ret < 0) { 199323d0b79dSTomohiro Misono goto out; 199423d0b79dSTomohiro Misono } else if (ret > 0) { 199523d0b79dSTomohiro Misono ret = -ENOENT; 199623d0b79dSTomohiro Misono goto out; 199723d0b79dSTomohiro Misono } 199823d0b79dSTomohiro Misono 199923d0b79dSTomohiro Misono leaf = path->nodes[0]; 200023d0b79dSTomohiro Misono slot = path->slots[0]; 200123d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 200223d0b79dSTomohiro Misono 200323d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 20043212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot); 200523d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 200623d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 200723d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 200823d0b79dSTomohiro Misono ret = -EINVAL; 200923d0b79dSTomohiro Misono goto out; 201023d0b79dSTomohiro Misono } 201123d0b79dSTomohiro Misono 201223d0b79dSTomohiro Misono /* Copy subvolume's name */ 201323d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 201423d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 201523d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 201623d0b79dSTomohiro Misono args->name[item_len] = 0; 201723d0b79dSTomohiro Misono 2018b8a49ae1SJosef Bacik out_put: 201900246528SJosef Bacik btrfs_put_root(root); 202023d0b79dSTomohiro Misono out: 202123d0b79dSTomohiro Misono btrfs_free_path(path); 202223d0b79dSTomohiro Misono return ret; 202323d0b79dSTomohiro Misono } 202423d0b79dSTomohiro Misono 2025dc408ccdSSahil Kang static noinline int btrfs_ioctl_ino_lookup(struct btrfs_root *root, 2026ac8e9819SChris Mason void __user *argp) 2027ac8e9819SChris Mason { 2028ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 202901b810b8SDavid Sterba int ret = 0; 2030ac8e9819SChris Mason 20312354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 20322354d08fSJulia Lawall if (IS_ERR(args)) 20332354d08fSJulia Lawall return PTR_ERR(args); 2034c2b96929SDan Carpenter 203501b810b8SDavid Sterba /* 203601b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 203701b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 203801b810b8SDavid Sterba */ 20391b53ac4dSChris Mason if (args->treeid == 0) 2040dc408ccdSSahil Kang args->treeid = root->root_key.objectid; 20411b53ac4dSChris Mason 204201b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 204301b810b8SDavid Sterba args->name[0] = 0; 204401b810b8SDavid Sterba goto out; 204501b810b8SDavid Sterba } 204601b810b8SDavid Sterba 204701b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 204801b810b8SDavid Sterba ret = -EPERM; 204901b810b8SDavid Sterba goto out; 205001b810b8SDavid Sterba } 205101b810b8SDavid Sterba 2052dc408ccdSSahil Kang ret = btrfs_search_path_in_tree(root->fs_info, 2053ac8e9819SChris Mason args->treeid, args->objectid, 2054ac8e9819SChris Mason args->name); 2055ac8e9819SChris Mason 205601b810b8SDavid Sterba out: 2057ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2058ac8e9819SChris Mason ret = -EFAULT; 2059ac8e9819SChris Mason 2060ac8e9819SChris Mason kfree(args); 206198d377a0STARUISI Hiroaki return ret; 206298d377a0STARUISI Hiroaki } 206398d377a0STARUISI Hiroaki 206423d0b79dSTomohiro Misono /* 206523d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 206623d0b79dSTomohiro Misono * 206723d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 206823d0b79dSTomohiro Misono * 206923d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 207023d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 207123d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 207223d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 207323d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 207423d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 207523d0b79dSTomohiro Misono */ 207623d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 207723d0b79dSTomohiro Misono { 207823d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 207923d0b79dSTomohiro Misono struct inode *inode; 208023d0b79dSTomohiro Misono int ret; 208123d0b79dSTomohiro Misono 208223d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 208323d0b79dSTomohiro Misono if (IS_ERR(args)) 208423d0b79dSTomohiro Misono return PTR_ERR(args); 208523d0b79dSTomohiro Misono 208623d0b79dSTomohiro Misono inode = file_inode(file); 208723d0b79dSTomohiro Misono 208823d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 208923d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 209023d0b79dSTomohiro Misono /* 209123d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 209223d0b79dSTomohiro Misono * called 209323d0b79dSTomohiro Misono */ 209423d0b79dSTomohiro Misono kfree(args); 209523d0b79dSTomohiro Misono return -EACCES; 209623d0b79dSTomohiro Misono } 209723d0b79dSTomohiro Misono 20986623d9a0SChristian Brauner ret = btrfs_search_path_in_tree_user(file_mnt_user_ns(file), inode, args); 209923d0b79dSTomohiro Misono 210023d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 210123d0b79dSTomohiro Misono ret = -EFAULT; 210223d0b79dSTomohiro Misono 210323d0b79dSTomohiro Misono kfree(args); 210423d0b79dSTomohiro Misono return ret; 210523d0b79dSTomohiro Misono } 210623d0b79dSTomohiro Misono 2107b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 21089ad12305SSahil Kang static int btrfs_ioctl_get_subvol_info(struct inode *inode, void __user *argp) 2109b64ec075STomohiro Misono { 2110b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2111b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2112b64ec075STomohiro Misono struct btrfs_root *root; 2113b64ec075STomohiro Misono struct btrfs_path *path; 2114b64ec075STomohiro Misono struct btrfs_key key; 2115b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2116b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2117b64ec075STomohiro Misono struct extent_buffer *leaf; 2118b64ec075STomohiro Misono unsigned long item_off; 2119b64ec075STomohiro Misono unsigned long item_len; 2120b64ec075STomohiro Misono int slot; 2121b64ec075STomohiro Misono int ret = 0; 2122b64ec075STomohiro Misono 2123b64ec075STomohiro Misono path = btrfs_alloc_path(); 2124b64ec075STomohiro Misono if (!path) 2125b64ec075STomohiro Misono return -ENOMEM; 2126b64ec075STomohiro Misono 2127b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2128b64ec075STomohiro Misono if (!subvol_info) { 2129b64ec075STomohiro Misono btrfs_free_path(path); 2130b64ec075STomohiro Misono return -ENOMEM; 2131b64ec075STomohiro Misono } 2132b64ec075STomohiro Misono 2133b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2134b64ec075STomohiro Misono 2135b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2136b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 213756e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2138b64ec075STomohiro Misono if (IS_ERR(root)) { 2139b64ec075STomohiro Misono ret = PTR_ERR(root); 214004734e84SJosef Bacik goto out_free; 214104734e84SJosef Bacik } 2142b64ec075STomohiro Misono root_item = &root->root_item; 2143b64ec075STomohiro Misono 2144b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2145b64ec075STomohiro Misono 2146b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2147b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2148b64ec075STomohiro Misono 2149b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2150b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2151b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2152b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2153b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2154b64ec075STomohiro Misono 2155b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2156b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2157b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2158b64ec075STomohiro Misono 2159b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2160b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2161b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2162b64ec075STomohiro Misono 2163b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2164b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2165b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2166b64ec075STomohiro Misono 2167b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2168b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2169b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2170b64ec075STomohiro Misono 2171b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2172b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2173b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2174b64ec075STomohiro Misono key.offset = 0; 217504734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2176b64ec075STomohiro Misono if (ret < 0) { 2177b64ec075STomohiro Misono goto out; 2178b64ec075STomohiro Misono } else if (path->slots[0] >= 2179b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 218004734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2181b64ec075STomohiro Misono if (ret < 0) { 2182b64ec075STomohiro Misono goto out; 2183b64ec075STomohiro Misono } else if (ret > 0) { 2184b64ec075STomohiro Misono ret = -EUCLEAN; 2185b64ec075STomohiro Misono goto out; 2186b64ec075STomohiro Misono } 2187b64ec075STomohiro Misono } 2188b64ec075STomohiro Misono 2189b64ec075STomohiro Misono leaf = path->nodes[0]; 2190b64ec075STomohiro Misono slot = path->slots[0]; 2191b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2192b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2193b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2194b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2195b64ec075STomohiro Misono 2196b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2197b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2198b64ec075STomohiro Misono 2199b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2200b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 22013212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot) 2202b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2203b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2204b64ec075STomohiro Misono item_off, item_len); 2205b64ec075STomohiro Misono } else { 2206b64ec075STomohiro Misono ret = -ENOENT; 2207b64ec075STomohiro Misono goto out; 2208b64ec075STomohiro Misono } 2209b64ec075STomohiro Misono } 2210b64ec075STomohiro Misono 2211013c1c55SAnand Jain btrfs_free_path(path); 2212013c1c55SAnand Jain path = NULL; 2213b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2214b64ec075STomohiro Misono ret = -EFAULT; 2215b64ec075STomohiro Misono 2216b64ec075STomohiro Misono out: 221700246528SJosef Bacik btrfs_put_root(root); 221804734e84SJosef Bacik out_free: 2219b64ec075STomohiro Misono btrfs_free_path(path); 2220b091f7feSWaiman Long kfree(subvol_info); 2221b64ec075STomohiro Misono return ret; 2222b64ec075STomohiro Misono } 2223b64ec075STomohiro Misono 222442e4b520STomohiro Misono /* 222542e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 222642e4b520STomohiro Misono * except the subvolume name. 222742e4b520STomohiro Misono */ 22289ad12305SSahil Kang static int btrfs_ioctl_get_subvol_rootref(struct btrfs_root *root, 2229dc408ccdSSahil Kang void __user *argp) 223042e4b520STomohiro Misono { 223142e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 223242e4b520STomohiro Misono struct btrfs_root_ref *rref; 223342e4b520STomohiro Misono struct btrfs_path *path; 223442e4b520STomohiro Misono struct btrfs_key key; 223542e4b520STomohiro Misono struct extent_buffer *leaf; 223642e4b520STomohiro Misono u64 objectid; 223742e4b520STomohiro Misono int slot; 223842e4b520STomohiro Misono int ret; 223942e4b520STomohiro Misono u8 found; 224042e4b520STomohiro Misono 224142e4b520STomohiro Misono path = btrfs_alloc_path(); 224242e4b520STomohiro Misono if (!path) 224342e4b520STomohiro Misono return -ENOMEM; 224442e4b520STomohiro Misono 224542e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 224642e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 224742e4b520STomohiro Misono btrfs_free_path(path); 224842e4b520STomohiro Misono return PTR_ERR(rootrefs); 224942e4b520STomohiro Misono } 225042e4b520STomohiro Misono 22519ad12305SSahil Kang objectid = root->root_key.objectid; 225242e4b520STomohiro Misono key.objectid = objectid; 225342e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 225442e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 225542e4b520STomohiro Misono found = 0; 225642e4b520STomohiro Misono 22579ad12305SSahil Kang root = root->fs_info->tree_root; 225842e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 225942e4b520STomohiro Misono if (ret < 0) { 226042e4b520STomohiro Misono goto out; 226142e4b520STomohiro Misono } else if (path->slots[0] >= 226242e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 226342e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 226442e4b520STomohiro Misono if (ret < 0) { 226542e4b520STomohiro Misono goto out; 226642e4b520STomohiro Misono } else if (ret > 0) { 226742e4b520STomohiro Misono ret = -EUCLEAN; 226842e4b520STomohiro Misono goto out; 226942e4b520STomohiro Misono } 227042e4b520STomohiro Misono } 227142e4b520STomohiro Misono while (1) { 227242e4b520STomohiro Misono leaf = path->nodes[0]; 227342e4b520STomohiro Misono slot = path->slots[0]; 227442e4b520STomohiro Misono 227542e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 227642e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 227742e4b520STomohiro Misono ret = 0; 227842e4b520STomohiro Misono goto out; 227942e4b520STomohiro Misono } 228042e4b520STomohiro Misono 228142e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 228242e4b520STomohiro Misono ret = -EOVERFLOW; 228342e4b520STomohiro Misono goto out; 228442e4b520STomohiro Misono } 228542e4b520STomohiro Misono 228642e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 228742e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 228842e4b520STomohiro Misono rootrefs->rootref[found].dirid = 228942e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 229042e4b520STomohiro Misono found++; 229142e4b520STomohiro Misono 229242e4b520STomohiro Misono ret = btrfs_next_item(root, path); 229342e4b520STomohiro Misono if (ret < 0) { 229442e4b520STomohiro Misono goto out; 229542e4b520STomohiro Misono } else if (ret > 0) { 229642e4b520STomohiro Misono ret = -EUCLEAN; 229742e4b520STomohiro Misono goto out; 229842e4b520STomohiro Misono } 229942e4b520STomohiro Misono } 230042e4b520STomohiro Misono 230142e4b520STomohiro Misono out: 2302b740d806SJosef Bacik btrfs_free_path(path); 2303b740d806SJosef Bacik 230442e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 230542e4b520STomohiro Misono rootrefs->num_items = found; 230642e4b520STomohiro Misono /* update min_treeid for next search */ 230742e4b520STomohiro Misono if (found) 230842e4b520STomohiro Misono rootrefs->min_treeid = 230942e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 231042e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 231142e4b520STomohiro Misono ret = -EFAULT; 231242e4b520STomohiro Misono } 231342e4b520STomohiro Misono 231442e4b520STomohiro Misono kfree(rootrefs); 231542e4b520STomohiro Misono 231642e4b520STomohiro Misono return ret; 231742e4b520STomohiro Misono } 231842e4b520STomohiro Misono 231976dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2320949964c9SMarcos Paulo de Souza void __user *arg, 2321949964c9SMarcos Paulo de Souza bool destroy_v2) 232276dda93cSYan, Zheng { 232354563d41SAl Viro struct dentry *parent = file->f_path.dentry; 23240b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 232576dda93cSYan, Zheng struct dentry *dentry; 23262b0143b5SDavid Howells struct inode *dir = d_inode(parent); 232776dda93cSYan, Zheng struct inode *inode; 232876dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 232976dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2330949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2331949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 2332c4ed533bSChristian Brauner struct user_namespace *mnt_userns = file_mnt_user_ns(file); 2333949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2334949964c9SMarcos Paulo de Souza int subvol_namelen; 233576dda93cSYan, Zheng int err = 0; 2336949964c9SMarcos Paulo de Souza bool destroy_parent = false; 233776dda93cSYan, Zheng 2338813febdbSJosef Bacik /* We don't support snapshots with extent tree v2 yet. */ 2339813febdbSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 2340813febdbSJosef Bacik btrfs_err(fs_info, 2341813febdbSJosef Bacik "extent tree v2 doesn't support snapshot deletion yet"); 2342813febdbSJosef Bacik return -EOPNOTSUPP; 2343813febdbSJosef Bacik } 2344813febdbSJosef Bacik 2345949964c9SMarcos Paulo de Souza if (destroy_v2) { 2346949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2347949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2348949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2349325c50e3SJeff Mahoney 2350949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2351949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2352949964c9SMarcos Paulo de Souza goto out; 2353949964c9SMarcos Paulo de Souza } 235476dda93cSYan, Zheng 2355949964c9SMarcos Paulo de Souza /* 2356949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2357949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2358949964c9SMarcos Paulo de Souza */ 2359949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2360949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2361949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2362949964c9SMarcos Paulo de Souza 2363949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2364949964c9SMarcos Paulo de Souza if (err) 2365949964c9SMarcos Paulo de Souza goto out; 2366949964c9SMarcos Paulo de Souza } else { 2367aabb34e7SChristian Brauner struct inode *old_dir; 2368c4ed533bSChristian Brauner 2369949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 237076dda93cSYan, Zheng err = -EINVAL; 237176dda93cSYan, Zheng goto out; 237276dda93cSYan, Zheng } 237376dda93cSYan, Zheng 2374a561be71SAl Viro err = mnt_want_write_file(file); 237576dda93cSYan, Zheng if (err) 237676dda93cSYan, Zheng goto out; 237776dda93cSYan, Zheng 2378949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 2379949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 2380b307f06dSDavid Sterba vol_args2->subvolid, 0); 2381949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 2382949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 2383949964c9SMarcos Paulo de Souza goto out_drop_write; 2384949964c9SMarcos Paulo de Souza } 2385949964c9SMarcos Paulo de Souza 2386949964c9SMarcos Paulo de Souza /* 2387949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 2388949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 2389949964c9SMarcos Paulo de Souza */ 2390949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 2391949964c9SMarcos Paulo de Souza 2392949964c9SMarcos Paulo de Souza /* 2393949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 2394949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 2395949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 2396949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 2397949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 2398949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 2399949964c9SMarcos Paulo de Souza */ 2400949964c9SMarcos Paulo de Souza dput(dentry); 2401949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 2402949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 2403949964c9SMarcos Paulo de Souza goto out_drop_write; 2404949964c9SMarcos Paulo de Souza } 2405aabb34e7SChristian Brauner old_dir = dir; 2406949964c9SMarcos Paulo de Souza dir = d_inode(parent); 2407949964c9SMarcos Paulo de Souza 2408949964c9SMarcos Paulo de Souza /* 2409949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 2410949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 2411949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 2412949964c9SMarcos Paulo de Souza * new parent dentry. 2413949964c9SMarcos Paulo de Souza */ 2414949964c9SMarcos Paulo de Souza destroy_parent = true; 2415949964c9SMarcos Paulo de Souza 2416aabb34e7SChristian Brauner /* 2417aabb34e7SChristian Brauner * On idmapped mounts, deletion via subvolid is 2418aabb34e7SChristian Brauner * restricted to subvolumes that are immediate 2419aabb34e7SChristian Brauner * ancestors of the inode referenced by the file 2420aabb34e7SChristian Brauner * descriptor in the ioctl. Otherwise the idmapping 2421aabb34e7SChristian Brauner * could potentially be abused to delete subvolumes 2422aabb34e7SChristian Brauner * anywhere in the filesystem the user wouldn't be able 2423aabb34e7SChristian Brauner * to delete without an idmapped mount. 2424aabb34e7SChristian Brauner */ 2425aabb34e7SChristian Brauner if (old_dir != dir && mnt_userns != &init_user_ns) { 2426aabb34e7SChristian Brauner err = -EOPNOTSUPP; 2427aabb34e7SChristian Brauner goto free_parent; 2428aabb34e7SChristian Brauner } 2429aabb34e7SChristian Brauner 2430949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 2431949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 2432949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 2433949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 2434949964c9SMarcos Paulo de Souza goto free_parent; 2435949964c9SMarcos Paulo de Souza } 24361a9fd417SDavid Sterba /* subvol_name_ptr is already nul terminated */ 2437949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 2438949964c9SMarcos Paulo de Souza } 2439949964c9SMarcos Paulo de Souza } else { 2440949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 2441949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 2442949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 2443949964c9SMarcos Paulo de Souza 2444949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 2445949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 2446949964c9SMarcos Paulo de Souza 2447949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2448949964c9SMarcos Paulo de Souza if (err) 2449949964c9SMarcos Paulo de Souza goto out; 2450949964c9SMarcos Paulo de Souza } 2451949964c9SMarcos Paulo de Souza 2452949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 2453949964c9SMarcos Paulo de Souza 2454949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 2455949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 2456949964c9SMarcos Paulo de Souza err = -EINVAL; 2457949964c9SMarcos Paulo de Souza goto free_subvol_name; 2458949964c9SMarcos Paulo de Souza } 2459949964c9SMarcos Paulo de Souza 2460949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 2461949964c9SMarcos Paulo de Souza err = -ENOTDIR; 2462949964c9SMarcos Paulo de Souza goto free_subvol_name; 2463949964c9SMarcos Paulo de Souza } 2464521e0546SDavid Sterba 246500235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 246600235411SAl Viro if (err == -EINTR) 2467949964c9SMarcos Paulo de Souza goto free_subvol_name; 2468c4ed533bSChristian Brauner dentry = lookup_one(mnt_userns, subvol_name, parent, subvol_namelen); 246976dda93cSYan, Zheng if (IS_ERR(dentry)) { 247076dda93cSYan, Zheng err = PTR_ERR(dentry); 247176dda93cSYan, Zheng goto out_unlock_dir; 247276dda93cSYan, Zheng } 247376dda93cSYan, Zheng 24742b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 247576dda93cSYan, Zheng err = -ENOENT; 247676dda93cSYan, Zheng goto out_dput; 247776dda93cSYan, Zheng } 247876dda93cSYan, Zheng 24792b0143b5SDavid Howells inode = d_inode(dentry); 24804260f7c7SSage Weil dest = BTRFS_I(inode)->root; 24814260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 24824260f7c7SSage Weil /* 24834260f7c7SSage Weil * Regular user. Only allow this with a special mount 24844260f7c7SSage Weil * option, when the user has write+exec access to the 24854260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 24864260f7c7SSage Weil * allowed. 24874260f7c7SSage Weil * 24884260f7c7SSage Weil * Note that this is _not_ check that the subvol is 24894260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 24904260f7c7SSage Weil * otherwise be able to delete. 24914260f7c7SSage Weil * 24924260f7c7SSage Weil * Users who want to delete empty subvols should try 24934260f7c7SSage Weil * rmdir(2). 24944260f7c7SSage Weil */ 24954260f7c7SSage Weil err = -EPERM; 24960b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 24974260f7c7SSage Weil goto out_dput; 24984260f7c7SSage Weil 24994260f7c7SSage Weil /* 25004260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 25014260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 25024260f7c7SSage Weil * must be called on the dentry referencing the root 25034260f7c7SSage Weil * of the subvol, not a random directory contained 25044260f7c7SSage Weil * within it. 25054260f7c7SSage Weil */ 25064260f7c7SSage Weil err = -EINVAL; 25074260f7c7SSage Weil if (root == dest) 25084260f7c7SSage Weil goto out_dput; 25094260f7c7SSage Weil 2510c4ed533bSChristian Brauner err = inode_permission(mnt_userns, inode, MAY_WRITE | MAY_EXEC); 25114260f7c7SSage Weil if (err) 25124260f7c7SSage Weil goto out_dput; 25135c39da5bSMiao Xie } 25144260f7c7SSage Weil 25155c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 2516c4ed533bSChristian Brauner err = btrfs_may_delete(mnt_userns, dir, dentry, 1); 25174260f7c7SSage Weil if (err) 25184260f7c7SSage Weil goto out_dput; 25194260f7c7SSage Weil 25204a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 252176dda93cSYan, Zheng err = -EINVAL; 252276dda93cSYan, Zheng goto out_dput; 252376dda93cSYan, Zheng } 252476dda93cSYan, Zheng 252564708539SJosef Bacik btrfs_inode_lock(inode, 0); 2526f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 252764708539SJosef Bacik btrfs_inode_unlock(inode, 0); 2528a37d9a17SAmir Goldstein if (!err) 2529a37d9a17SAmir Goldstein d_delete_notify(dir, dentry); 2530fa6ac876SLiu Bo 253176dda93cSYan, Zheng out_dput: 253276dda93cSYan, Zheng dput(dentry); 253376dda93cSYan, Zheng out_unlock_dir: 253464708539SJosef Bacik btrfs_inode_unlock(dir, 0); 2535949964c9SMarcos Paulo de Souza free_subvol_name: 2536949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 2537949964c9SMarcos Paulo de Souza free_parent: 2538949964c9SMarcos Paulo de Souza if (destroy_parent) 2539949964c9SMarcos Paulo de Souza dput(parent); 254000235411SAl Viro out_drop_write: 25412a79f17eSAl Viro mnt_drop_write_file(file); 254276dda93cSYan, Zheng out: 2543949964c9SMarcos Paulo de Souza kfree(vol_args2); 254476dda93cSYan, Zheng kfree(vol_args); 254576dda93cSYan, Zheng return err; 254676dda93cSYan, Zheng } 254776dda93cSYan, Zheng 25481e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2549f46b5a66SChristoph Hellwig { 2550496ad9aaSAl Viro struct inode *inode = file_inode(file); 2551f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2552c853a578SGoldwyn Rodrigues struct btrfs_ioctl_defrag_range_args range = {0}; 2553c146afadSYan Zheng int ret; 2554c146afadSYan Zheng 255525122d15SIlya Dryomov ret = mnt_want_write_file(file); 255625122d15SIlya Dryomov if (ret) 255725122d15SIlya Dryomov return ret; 2558b83cc969SLi Zefan 255925122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 256025122d15SIlya Dryomov ret = -EROFS; 256125122d15SIlya Dryomov goto out; 25625ac00addSStefan Behrens } 2563f46b5a66SChristoph Hellwig 2564f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2565f46b5a66SChristoph Hellwig case S_IFDIR: 2566e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2567e441d54dSChris Mason ret = -EPERM; 2568e441d54dSChris Mason goto out; 2569e441d54dSChris Mason } 2570de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 2571f46b5a66SChristoph Hellwig break; 2572f46b5a66SChristoph Hellwig case S_IFREG: 2573616d374eSAdam Borowski /* 2574616d374eSAdam Borowski * Note that this does not check the file descriptor for write 2575616d374eSAdam Borowski * access. This prevents defragmenting executables that are 2576616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 2577616d374eSAdam Borowski */ 2578616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 257947291baaSChristian Brauner inode_permission(&init_user_ns, inode, MAY_WRITE)) { 2580616d374eSAdam Borowski ret = -EPERM; 2581e441d54dSChris Mason goto out; 2582e441d54dSChris Mason } 25831e701a32SChris Mason 25841e701a32SChris Mason if (argp) { 2585c853a578SGoldwyn Rodrigues if (copy_from_user(&range, argp, sizeof(range))) { 25861e701a32SChris Mason ret = -EFAULT; 2587683be16eSDan Carpenter goto out; 25881e701a32SChris Mason } 25891e701a32SChris Mason /* compression requires us to start the IO */ 2590c853a578SGoldwyn Rodrigues if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 2591c853a578SGoldwyn Rodrigues range.flags |= BTRFS_DEFRAG_RANGE_START_IO; 2592c853a578SGoldwyn Rodrigues range.extent_thresh = (u32)-1; 25931e701a32SChris Mason } 25941e701a32SChris Mason } else { 25951e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 2596c853a578SGoldwyn Rodrigues range.len = (u64)-1; 25971e701a32SChris Mason } 25981ccc2e8aSQu Wenruo ret = btrfs_defrag_file(file_inode(file), &file->f_ra, 2599c853a578SGoldwyn Rodrigues &range, BTRFS_OLDEST_GENERATION, 0); 26004cb5300bSChris Mason if (ret > 0) 26014cb5300bSChris Mason ret = 0; 2602f46b5a66SChristoph Hellwig break; 26038929ecfaSYan, Zheng default: 26048929ecfaSYan, Zheng ret = -EINVAL; 2605f46b5a66SChristoph Hellwig } 2606e441d54dSChris Mason out: 260725122d15SIlya Dryomov mnt_drop_write_file(file); 2608e441d54dSChris Mason return ret; 2609f46b5a66SChristoph Hellwig } 2610f46b5a66SChristoph Hellwig 26112ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 2612f46b5a66SChristoph Hellwig { 2613f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2614a174c0a2SNikolay Borisov bool restore_op = false; 2615f46b5a66SChristoph Hellwig int ret; 2616f46b5a66SChristoph Hellwig 2617e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2618e441d54dSChris Mason return -EPERM; 2619e441d54dSChris Mason 2620914a519bSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 2621914a519bSJosef Bacik btrfs_err(fs_info, "device add not supported on extent tree v2 yet"); 2622914a519bSJosef Bacik return -EINVAL; 2623914a519bSJosef Bacik } 2624914a519bSJosef Bacik 2625a174c0a2SNikolay Borisov if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) { 2626a174c0a2SNikolay Borisov if (!btrfs_exclop_start_try_lock(fs_info, BTRFS_EXCLOP_DEV_ADD)) 2627e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2628c9e9f97bSIlya Dryomov 2629a174c0a2SNikolay Borisov /* 2630a174c0a2SNikolay Borisov * We can do the device add because we have a paused balanced, 2631a174c0a2SNikolay Borisov * change the exclusive op type and remember we should bring 2632a174c0a2SNikolay Borisov * back the paused balance 2633a174c0a2SNikolay Borisov */ 2634a174c0a2SNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_DEV_ADD; 2635a174c0a2SNikolay Borisov btrfs_exclop_start_unlock(fs_info); 2636a174c0a2SNikolay Borisov restore_op = true; 2637a174c0a2SNikolay Borisov } 2638a174c0a2SNikolay Borisov 2639dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2640c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2641c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2642c9e9f97bSIlya Dryomov goto out; 2643c9e9f97bSIlya Dryomov } 2644f46b5a66SChristoph Hellwig 26455516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 26462ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 2647f46b5a66SChristoph Hellwig 264843d20761SAnand Jain if (!ret) 26490b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 265043d20761SAnand Jain 2651f46b5a66SChristoph Hellwig kfree(vol_args); 2652c9e9f97bSIlya Dryomov out: 2653a174c0a2SNikolay Borisov if (restore_op) 2654a174c0a2SNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED); 2655a174c0a2SNikolay Borisov else 2656c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 2657f46b5a66SChristoph Hellwig return ret; 2658f46b5a66SChristoph Hellwig } 2659f46b5a66SChristoph Hellwig 26606b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 2661f46b5a66SChristoph Hellwig { 26621a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 26630b246afaSJeff Mahoney struct inode *inode = file_inode(file); 26640b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 26656b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 26663fa421deSJosef Bacik struct block_device *bdev = NULL; 26673fa421deSJosef Bacik fmode_t mode; 2668f46b5a66SChristoph Hellwig int ret; 266967ae34b6SDavid Sterba bool cancel = false; 2670f46b5a66SChristoph Hellwig 2671e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2672e441d54dSChris Mason return -EPERM; 2673e441d54dSChris Mason 2674dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2675d815b3f2SDan Carpenter if (IS_ERR(vol_args)) 2676d815b3f2SDan Carpenter return PTR_ERR(vol_args); 2677f46b5a66SChristoph Hellwig 2678748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 2679fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 2680fd4e994bSOmar Sandoval goto out; 2681fd4e994bSOmar Sandoval } 26821a15eb72SJosef Bacik 26836b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 26841a15eb72SJosef Bacik if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 26851a15eb72SJosef Bacik args.devid = vol_args->devid; 26861a15eb72SJosef Bacik } else if (!strcmp("cancel", vol_args->name)) { 268767ae34b6SDavid Sterba cancel = true; 26881a15eb72SJosef Bacik } else { 26891a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 26901a15eb72SJosef Bacik if (ret) 26911a15eb72SJosef Bacik goto out; 26921a15eb72SJosef Bacik } 26931a15eb72SJosef Bacik 26941a15eb72SJosef Bacik ret = mnt_want_write_file(file); 26951a15eb72SJosef Bacik if (ret) 26961a15eb72SJosef Bacik goto out; 269767ae34b6SDavid Sterba 269867ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 269967ae34b6SDavid Sterba cancel); 270067ae34b6SDavid Sterba if (ret) 27011a15eb72SJosef Bacik goto err_drop; 270267ae34b6SDavid Sterba 27031a15eb72SJosef Bacik /* Exclusive operation is now claimed */ 27041a15eb72SJosef Bacik ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); 270567ae34b6SDavid Sterba 2706c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 2707183860f6SAnand Jain 27086b526ed7SAnand Jain if (!ret) { 2709735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 27100b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 27116b526ed7SAnand Jain vol_args->devid); 27126b526ed7SAnand Jain else 27130b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 27146b526ed7SAnand Jain vol_args->name); 27156b526ed7SAnand Jain } 2716c47ca32dSDan Carpenter err_drop: 27174ac20c70SIlya Dryomov mnt_drop_write_file(file); 27183fa421deSJosef Bacik if (bdev) 27193fa421deSJosef Bacik blkdev_put(bdev, mode); 27201a15eb72SJosef Bacik out: 27211a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 27221a15eb72SJosef Bacik kfree(vol_args); 2723f46b5a66SChristoph Hellwig return ret; 2724f46b5a66SChristoph Hellwig } 2725f46b5a66SChristoph Hellwig 2726f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2727f46b5a66SChristoph Hellwig { 27281a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 27290b246afaSJeff Mahoney struct inode *inode = file_inode(file); 27300b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 2731f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 27323fa421deSJosef Bacik struct block_device *bdev = NULL; 27333fa421deSJosef Bacik fmode_t mode; 2734f46b5a66SChristoph Hellwig int ret; 273537b45995STom Rix bool cancel = false; 2736f46b5a66SChristoph Hellwig 2737f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 2738f46b5a66SChristoph Hellwig return -EPERM; 2739f46b5a66SChristoph Hellwig 27401a15eb72SJosef Bacik vol_args = memdup_user(arg, sizeof(*vol_args)); 27411a15eb72SJosef Bacik if (IS_ERR(vol_args)) 27421a15eb72SJosef Bacik return PTR_ERR(vol_args); 27431a15eb72SJosef Bacik 27441a15eb72SJosef Bacik vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 27451a15eb72SJosef Bacik if (!strcmp("cancel", vol_args->name)) { 27461a15eb72SJosef Bacik cancel = true; 27471a15eb72SJosef Bacik } else { 27481a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 27491a15eb72SJosef Bacik if (ret) 27501a15eb72SJosef Bacik goto out; 27511a15eb72SJosef Bacik } 27521a15eb72SJosef Bacik 2753f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 2754f46b5a66SChristoph Hellwig if (ret) 27551a15eb72SJosef Bacik goto out; 2756f46b5a66SChristoph Hellwig 275767ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 275867ae34b6SDavid Sterba cancel); 275967ae34b6SDavid Sterba if (ret == 0) { 27601a15eb72SJosef Bacik ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); 2761f46b5a66SChristoph Hellwig if (!ret) 27620b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 2763c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 276467ae34b6SDavid Sterba } 276567ae34b6SDavid Sterba 2766f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 27673fa421deSJosef Bacik if (bdev) 27683fa421deSJosef Bacik blkdev_put(bdev, mode); 27691a15eb72SJosef Bacik out: 27701a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 27711a15eb72SJosef Bacik kfree(vol_args); 2772f46b5a66SChristoph Hellwig return ret; 2773f46b5a66SChristoph Hellwig } 2774f46b5a66SChristoph Hellwig 27752ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 27762ff7e61eSJeff Mahoney void __user *arg) 2777475f6387SJan Schmidt { 2778027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2779475f6387SJan Schmidt struct btrfs_device *device; 27800b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 2781137c5418SJohannes Thumshirn u64 flags_in; 2782027ed2f0SLi Zefan int ret = 0; 2783475f6387SJan Schmidt 2784137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 2785137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 2786137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 2787137c5418SJohannes Thumshirn 2788137c5418SJohannes Thumshirn flags_in = fi_args->flags; 2789137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 2790027ed2f0SLi Zefan 2791d03262c7SDavid Sterba rcu_read_lock(); 2792027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2793475f6387SJan Schmidt 2794d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 2795027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2796027ed2f0SLi Zefan fi_args->max_id = device->devid; 2797475f6387SJan Schmidt } 2798d03262c7SDavid Sterba rcu_read_unlock(); 2799475f6387SJan Schmidt 2800de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 2801bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 2802bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 2803bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 280480a773fbSDavid Sterba 2805137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 2806137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 2807137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 2808137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 2809137c5418SJohannes Thumshirn } 2810137c5418SJohannes Thumshirn 28110fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 28120fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 28130fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 28140fb408a5SJohannes Thumshirn } 28150fb408a5SJohannes Thumshirn 281649bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 281749bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 281849bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 281949bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 282049bac897SJohannes Thumshirn } 282149bac897SJohannes Thumshirn 2822027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2823027ed2f0SLi Zefan ret = -EFAULT; 2824475f6387SJan Schmidt 2825027ed2f0SLi Zefan kfree(fi_args); 2826027ed2f0SLi Zefan return ret; 2827475f6387SJan Schmidt } 2828475f6387SJan Schmidt 28292ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 28302ff7e61eSJeff Mahoney void __user *arg) 2831475f6387SJan Schmidt { 2832562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 2833475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2834475f6387SJan Schmidt struct btrfs_device *dev; 2835475f6387SJan Schmidt int ret = 0; 2836475f6387SJan Schmidt 2837475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2838475f6387SJan Schmidt if (IS_ERR(di_args)) 2839475f6387SJan Schmidt return PTR_ERR(di_args); 2840475f6387SJan Schmidt 2841562d7b15SJosef Bacik args.devid = di_args->devid; 2842dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 2843562d7b15SJosef Bacik args.uuid = di_args->uuid; 2844475f6387SJan Schmidt 2845c5593ca3SDavid Sterba rcu_read_lock(); 2846562d7b15SJosef Bacik dev = btrfs_find_device(fs_info->fs_devices, &args); 2847475f6387SJan Schmidt if (!dev) { 2848475f6387SJan Schmidt ret = -ENODEV; 2849475f6387SJan Schmidt goto out; 2850475f6387SJan Schmidt } 2851475f6387SJan Schmidt 2852475f6387SJan Schmidt di_args->devid = dev->devid; 28537cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 28547cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 2855475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2856a27202fbSJim Meyering if (dev->name) { 2857672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 2858672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 2859a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2860a27202fbSJim Meyering } else { 286199ba55adSStefan Behrens di_args->path[0] = '\0'; 2862a27202fbSJim Meyering } 2863475f6387SJan Schmidt 2864475f6387SJan Schmidt out: 2865c5593ca3SDavid Sterba rcu_read_unlock(); 2866475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2867475f6387SJan Schmidt ret = -EFAULT; 2868475f6387SJan Schmidt 2869475f6387SJan Schmidt kfree(di_args); 2870475f6387SJan Schmidt return ret; 2871475f6387SJan Schmidt } 2872475f6387SJan Schmidt 28736ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 28746ef5ed0dSJosef Bacik { 2875496ad9aaSAl Viro struct inode *inode = file_inode(file); 28760b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 28776ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 28786ef5ed0dSJosef Bacik struct btrfs_root *new_root; 28796ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 28806ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 28812a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 28826ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 28836db75318SSweet Tea Dorminy struct fscrypt_str name = FSTR_INIT("default", 7); 28846ef5ed0dSJosef Bacik u64 objectid = 0; 28856ef5ed0dSJosef Bacik u64 dir_id; 28863c04ce01SMiao Xie int ret; 28876ef5ed0dSJosef Bacik 28886ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 28896ef5ed0dSJosef Bacik return -EPERM; 28906ef5ed0dSJosef Bacik 28913c04ce01SMiao Xie ret = mnt_want_write_file(file); 28923c04ce01SMiao Xie if (ret) 28933c04ce01SMiao Xie return ret; 28943c04ce01SMiao Xie 28953c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 28963c04ce01SMiao Xie ret = -EFAULT; 28973c04ce01SMiao Xie goto out; 28983c04ce01SMiao Xie } 28996ef5ed0dSJosef Bacik 29006ef5ed0dSJosef Bacik if (!objectid) 29011cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 29026ef5ed0dSJosef Bacik 290356e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 29043c04ce01SMiao Xie if (IS_ERR(new_root)) { 29053c04ce01SMiao Xie ret = PTR_ERR(new_root); 29063c04ce01SMiao Xie goto out; 29073c04ce01SMiao Xie } 29082a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 29092a2b5d62SJosef Bacik ret = -ENOENT; 29102a2b5d62SJosef Bacik goto out_free; 29112a2b5d62SJosef Bacik } 29126ef5ed0dSJosef Bacik 29136ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 29143c04ce01SMiao Xie if (!path) { 29153c04ce01SMiao Xie ret = -ENOMEM; 29162a2b5d62SJosef Bacik goto out_free; 29173c04ce01SMiao Xie } 29186ef5ed0dSJosef Bacik 29196ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 292098d5dc13STsutomu Itoh if (IS_ERR(trans)) { 29213c04ce01SMiao Xie ret = PTR_ERR(trans); 29222a2b5d62SJosef Bacik goto out_free; 29236ef5ed0dSJosef Bacik } 29246ef5ed0dSJosef Bacik 29250b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 29260b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 2927e43eec81SSweet Tea Dorminy dir_id, &name, 1); 2928cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 29292a2b5d62SJosef Bacik btrfs_release_path(path); 29303a45bb20SJeff Mahoney btrfs_end_transaction(trans); 29310b246afaSJeff Mahoney btrfs_err(fs_info, 29325d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 29333c04ce01SMiao Xie ret = -ENOENT; 29342a2b5d62SJosef Bacik goto out_free; 29356ef5ed0dSJosef Bacik } 29366ef5ed0dSJosef Bacik 29376ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 29386ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 29396ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 29402a2b5d62SJosef Bacik btrfs_release_path(path); 29416ef5ed0dSJosef Bacik 29420b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 29433a45bb20SJeff Mahoney btrfs_end_transaction(trans); 29442a2b5d62SJosef Bacik out_free: 294500246528SJosef Bacik btrfs_put_root(new_root); 29462a2b5d62SJosef Bacik btrfs_free_path(path); 29473c04ce01SMiao Xie out: 29483c04ce01SMiao Xie mnt_drop_write_file(file); 29493c04ce01SMiao Xie return ret; 29506ef5ed0dSJosef Bacik } 29516ef5ed0dSJosef Bacik 2952c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 2953bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 2954bf5fc093SJosef Bacik { 295532da5386SDavid Sterba struct btrfs_block_group *block_group; 2956bf5fc093SJosef Bacik 2957bf5fc093SJosef Bacik space->total_bytes = 0; 2958bf5fc093SJosef Bacik space->used_bytes = 0; 2959bf5fc093SJosef Bacik space->flags = 0; 2960bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 2961bf5fc093SJosef Bacik space->flags = block_group->flags; 2962b3470b5dSDavid Sterba space->total_bytes += block_group->length; 2963bf38be65SDavid Sterba space->used_bytes += block_group->used; 2964bf5fc093SJosef Bacik } 2965bf5fc093SJosef Bacik } 2966bf5fc093SJosef Bacik 29672ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 29682ff7e61eSJeff Mahoney void __user *arg) 29691406e432SJosef Bacik { 29701406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 29711406e432SJosef Bacik struct btrfs_ioctl_space_info space; 29721406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 29737fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 297413f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 29751406e432SJosef Bacik struct btrfs_space_info *info; 2976315d8e98SColin Ian King static const u64 types[] = { 2977315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 2978bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 2979bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 2980315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 2981315d8e98SColin Ian King }; 2982bf5fc093SJosef Bacik int num_types = 4; 29837fde62bfSChris Mason int alloc_size; 29841406e432SJosef Bacik int ret = 0; 298551788b1bSDan Rosenberg u64 slot_count = 0; 2986bf5fc093SJosef Bacik int i, c; 29871406e432SJosef Bacik 29881406e432SJosef Bacik if (copy_from_user(&space_args, 29891406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 29901406e432SJosef Bacik sizeof(space_args))) 29911406e432SJosef Bacik return -EFAULT; 29921406e432SJosef Bacik 2993bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2994bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2995bf5fc093SJosef Bacik 2996bf5fc093SJosef Bacik info = NULL; 299772804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 2998bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2999bf5fc093SJosef Bacik info = tmp; 3000bf5fc093SJosef Bacik break; 3001bf5fc093SJosef Bacik } 3002bf5fc093SJosef Bacik } 30031406e432SJosef Bacik 3004bf5fc093SJosef Bacik if (!info) 3005bf5fc093SJosef Bacik continue; 3006bf5fc093SJosef Bacik 3007bf5fc093SJosef Bacik down_read(&info->groups_sem); 3008bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3009bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3010bf5fc093SJosef Bacik slot_count++; 3011bf5fc093SJosef Bacik } 3012bf5fc093SJosef Bacik up_read(&info->groups_sem); 3013bf5fc093SJosef Bacik } 3014bf5fc093SJosef Bacik 301536523e95SDavid Sterba /* 301636523e95SDavid Sterba * Global block reserve, exported as a space_info 301736523e95SDavid Sterba */ 301836523e95SDavid Sterba slot_count++; 301936523e95SDavid Sterba 30207fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 30217fde62bfSChris Mason if (space_args.space_slots == 0) { 30227fde62bfSChris Mason space_args.total_spaces = slot_count; 30237fde62bfSChris Mason goto out; 30247fde62bfSChris Mason } 3025bf5fc093SJosef Bacik 302651788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3027bf5fc093SJosef Bacik 30287fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3029bf5fc093SJosef Bacik 30307fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 30317fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 30327fde62bfSChris Mason */ 303309cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 30347fde62bfSChris Mason return -ENOMEM; 30357fde62bfSChris Mason 30367fde62bfSChris Mason space_args.total_spaces = 0; 30378d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 30387fde62bfSChris Mason if (!dest) 30397fde62bfSChris Mason return -ENOMEM; 30407fde62bfSChris Mason dest_orig = dest; 30417fde62bfSChris Mason 30427fde62bfSChris Mason /* now we have a buffer to copy into */ 3043bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3044bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3045bf5fc093SJosef Bacik 304651788b1bSDan Rosenberg if (!slot_count) 304751788b1bSDan Rosenberg break; 304851788b1bSDan Rosenberg 3049bf5fc093SJosef Bacik info = NULL; 305072804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3051bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3052bf5fc093SJosef Bacik info = tmp; 30537fde62bfSChris Mason break; 3054bf5fc093SJosef Bacik } 3055bf5fc093SJosef Bacik } 30567fde62bfSChris Mason 3057bf5fc093SJosef Bacik if (!info) 3058bf5fc093SJosef Bacik continue; 3059bf5fc093SJosef Bacik down_read(&info->groups_sem); 3060bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3061bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3062c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3063c065f5b1SSu Yue &space); 30647fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 30651406e432SJosef Bacik dest++; 30661406e432SJosef Bacik space_args.total_spaces++; 306751788b1bSDan Rosenberg slot_count--; 30681406e432SJosef Bacik } 306951788b1bSDan Rosenberg if (!slot_count) 307051788b1bSDan Rosenberg break; 3071bf5fc093SJosef Bacik } 3072bf5fc093SJosef Bacik up_read(&info->groups_sem); 3073bf5fc093SJosef Bacik } 30741406e432SJosef Bacik 307536523e95SDavid Sterba /* 307636523e95SDavid Sterba * Add global block reserve 307736523e95SDavid Sterba */ 307836523e95SDavid Sterba if (slot_count) { 30790b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 308036523e95SDavid Sterba 308136523e95SDavid Sterba spin_lock(&block_rsv->lock); 308236523e95SDavid Sterba space.total_bytes = block_rsv->size; 308336523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 308436523e95SDavid Sterba spin_unlock(&block_rsv->lock); 308536523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 308636523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 308736523e95SDavid Sterba space_args.total_spaces++; 308836523e95SDavid Sterba } 308936523e95SDavid Sterba 30902eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 30917fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 30927fde62bfSChris Mason 30937fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 30947fde62bfSChris Mason ret = -EFAULT; 30957fde62bfSChris Mason 30967fde62bfSChris Mason kfree(dest_orig); 30977fde62bfSChris Mason out: 30987fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 30991406e432SJosef Bacik ret = -EFAULT; 31001406e432SJosef Bacik 31011406e432SJosef Bacik return ret; 31021406e432SJosef Bacik } 31031406e432SJosef Bacik 31049a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 31059a8c28beSMiao Xie void __user *argp) 310646204592SSage Weil { 310746204592SSage Weil struct btrfs_trans_handle *trans; 310846204592SSage Weil u64 transid; 310946204592SSage Weil 3110d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3111ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3112ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 311398d5dc13STsutomu Itoh return PTR_ERR(trans); 3114ff7c1d33SMiao Xie 3115ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3116ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3117ff7c1d33SMiao Xie goto out; 3118ff7c1d33SMiao Xie } 311946204592SSage Weil transid = trans->transid; 3120fdfbf020SJosef Bacik btrfs_commit_transaction_async(trans); 3121ff7c1d33SMiao Xie out: 312246204592SSage Weil if (argp) 312346204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 312446204592SSage Weil return -EFAULT; 312546204592SSage Weil return 0; 312646204592SSage Weil } 312746204592SSage Weil 31282ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 31299a8c28beSMiao Xie void __user *argp) 313046204592SSage Weil { 313146204592SSage Weil u64 transid; 313246204592SSage Weil 313346204592SSage Weil if (argp) { 313446204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 313546204592SSage Weil return -EFAULT; 313646204592SSage Weil } else { 313746204592SSage Weil transid = 0; /* current trans */ 313846204592SSage Weil } 31392ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 314046204592SSage Weil } 314146204592SSage Weil 3142b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3143475f6387SJan Schmidt { 31440b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3145475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3146b8e95489SMiao Xie int ret; 3147475f6387SJan Schmidt 3148475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3149475f6387SJan Schmidt return -EPERM; 3150475f6387SJan Schmidt 3151da32c6d5SJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 3152da32c6d5SJosef Bacik btrfs_err(fs_info, "scrub is not supported on extent tree v2 yet"); 3153da32c6d5SJosef Bacik return -EINVAL; 3154da32c6d5SJosef Bacik } 3155da32c6d5SJosef Bacik 3156475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3157475f6387SJan Schmidt if (IS_ERR(sa)) 3158475f6387SJan Schmidt return PTR_ERR(sa); 3159475f6387SJan Schmidt 3160b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3161b8e95489SMiao Xie ret = mnt_want_write_file(file); 3162b8e95489SMiao Xie if (ret) 3163b8e95489SMiao Xie goto out; 3164b8e95489SMiao Xie } 3165b8e95489SMiao Xie 31660b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 316763a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 316863a212abSStefan Behrens 0); 3169475f6387SJan Schmidt 31705afe6ce7SFilipe Manana /* 31715afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 31725afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 31735afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 31745afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 31755afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 31765afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 31775afe6ce7SFilipe Manana * previously (btrfs-progs does this). 31785afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 31795afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 31805afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 31815afe6ce7SFilipe Manana */ 31825afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3183475f6387SJan Schmidt ret = -EFAULT; 3184475f6387SJan Schmidt 3185b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3186b8e95489SMiao Xie mnt_drop_write_file(file); 3187b8e95489SMiao Xie out: 3188475f6387SJan Schmidt kfree(sa); 3189475f6387SJan Schmidt return ret; 3190475f6387SJan Schmidt } 3191475f6387SJan Schmidt 31922ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3193475f6387SJan Schmidt { 3194475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3195475f6387SJan Schmidt return -EPERM; 3196475f6387SJan Schmidt 31972ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3198475f6387SJan Schmidt } 3199475f6387SJan Schmidt 32002ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3201475f6387SJan Schmidt void __user *arg) 3202475f6387SJan Schmidt { 3203475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3204475f6387SJan Schmidt int ret; 3205475f6387SJan Schmidt 3206475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3207475f6387SJan Schmidt return -EPERM; 3208475f6387SJan Schmidt 3209475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3210475f6387SJan Schmidt if (IS_ERR(sa)) 3211475f6387SJan Schmidt return PTR_ERR(sa); 3212475f6387SJan Schmidt 32132ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3214475f6387SJan Schmidt 32154fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3216475f6387SJan Schmidt ret = -EFAULT; 3217475f6387SJan Schmidt 3218475f6387SJan Schmidt kfree(sa); 3219475f6387SJan Schmidt return ret; 3220475f6387SJan Schmidt } 3221475f6387SJan Schmidt 32222ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3223b27f7c0cSDavid Sterba void __user *arg) 3224c11d2c23SStefan Behrens { 3225c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3226c11d2c23SStefan Behrens int ret; 3227c11d2c23SStefan Behrens 3228c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3229c11d2c23SStefan Behrens if (IS_ERR(sa)) 3230c11d2c23SStefan Behrens return PTR_ERR(sa); 3231c11d2c23SStefan Behrens 3232b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3233b27f7c0cSDavid Sterba kfree(sa); 3234b27f7c0cSDavid Sterba return -EPERM; 3235b27f7c0cSDavid Sterba } 3236b27f7c0cSDavid Sterba 32372ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3238c11d2c23SStefan Behrens 3239eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3240c11d2c23SStefan Behrens ret = -EFAULT; 3241c11d2c23SStefan Behrens 3242c11d2c23SStefan Behrens kfree(sa); 3243c11d2c23SStefan Behrens return ret; 3244c11d2c23SStefan Behrens } 3245c11d2c23SStefan Behrens 32462ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 32472ff7e61eSJeff Mahoney void __user *arg) 32483f6bcfbdSStefan Behrens { 32493f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 32503f6bcfbdSStefan Behrens int ret; 32513f6bcfbdSStefan Behrens 32523f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 32533f6bcfbdSStefan Behrens return -EPERM; 32543f6bcfbdSStefan Behrens 3255914a519bSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 3256914a519bSJosef Bacik btrfs_err(fs_info, "device replace not supported on extent tree v2 yet"); 3257914a519bSJosef Bacik return -EINVAL; 3258914a519bSJosef Bacik } 3259914a519bSJosef Bacik 32603f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 32613f6bcfbdSStefan Behrens if (IS_ERR(p)) 32623f6bcfbdSStefan Behrens return PTR_ERR(p); 32633f6bcfbdSStefan Behrens 32643f6bcfbdSStefan Behrens switch (p->cmd) { 32653f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3266bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3267adfa97cbSIlya Dryomov ret = -EROFS; 3268adfa97cbSIlya Dryomov goto out; 3269adfa97cbSIlya Dryomov } 3270c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 3271e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 32723f6bcfbdSStefan Behrens } else { 32732ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3274c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 32753f6bcfbdSStefan Behrens } 32763f6bcfbdSStefan Behrens break; 32773f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 32780b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 32793f6bcfbdSStefan Behrens ret = 0; 32803f6bcfbdSStefan Behrens break; 32813f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 328217d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 328397282031SAnand Jain ret = 0; 32843f6bcfbdSStefan Behrens break; 32853f6bcfbdSStefan Behrens default: 32863f6bcfbdSStefan Behrens ret = -EINVAL; 32873f6bcfbdSStefan Behrens break; 32883f6bcfbdSStefan Behrens } 32893f6bcfbdSStefan Behrens 3290d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 32913f6bcfbdSStefan Behrens ret = -EFAULT; 3292adfa97cbSIlya Dryomov out: 32933f6bcfbdSStefan Behrens kfree(p); 32943f6bcfbdSStefan Behrens return ret; 32953f6bcfbdSStefan Behrens } 32963f6bcfbdSStefan Behrens 3297d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3298d7728c96SJan Schmidt { 3299d7728c96SJan Schmidt int ret = 0; 3300d7728c96SJan Schmidt int i; 3301740c3d22SChris Mason u64 rel_ptr; 3302d7728c96SJan Schmidt int size; 3303806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3304d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3305d7728c96SJan Schmidt struct btrfs_path *path; 3306d7728c96SJan Schmidt 330782b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3308d7728c96SJan Schmidt return -EPERM; 3309d7728c96SJan Schmidt 3310d7728c96SJan Schmidt path = btrfs_alloc_path(); 3311d7728c96SJan Schmidt if (!path) { 3312d7728c96SJan Schmidt ret = -ENOMEM; 3313d7728c96SJan Schmidt goto out; 3314d7728c96SJan Schmidt } 3315d7728c96SJan Schmidt 3316d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3317d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3318d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3319d7728c96SJan Schmidt ipa = NULL; 3320d7728c96SJan Schmidt goto out; 3321d7728c96SJan Schmidt } 3322d7728c96SJan Schmidt 3323d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3324d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3325d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3326d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3327d7728c96SJan Schmidt ipath = NULL; 3328d7728c96SJan Schmidt goto out; 3329d7728c96SJan Schmidt } 3330d7728c96SJan Schmidt 3331d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3332d7728c96SJan Schmidt if (ret < 0) 3333d7728c96SJan Schmidt goto out; 3334d7728c96SJan Schmidt 3335d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3336745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3337745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3338740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3339d7728c96SJan Schmidt } 3340d7728c96SJan Schmidt 33418cf96b40SAnand Jain btrfs_free_path(path); 33428cf96b40SAnand Jain path = NULL; 3343718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3344718dc5faSOmar Sandoval ipath->fspath, size); 3345d7728c96SJan Schmidt if (ret) { 3346d7728c96SJan Schmidt ret = -EFAULT; 3347d7728c96SJan Schmidt goto out; 3348d7728c96SJan Schmidt } 3349d7728c96SJan Schmidt 3350d7728c96SJan Schmidt out: 3351d7728c96SJan Schmidt btrfs_free_path(path); 3352d7728c96SJan Schmidt free_ipath(ipath); 3353d7728c96SJan Schmidt kfree(ipa); 3354d7728c96SJan Schmidt 3355d7728c96SJan Schmidt return ret; 3356d7728c96SJan Schmidt } 3357d7728c96SJan Schmidt 33582ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3359d24a67b2SZygo Blaxell void __user *arg, int version) 3360d7728c96SJan Schmidt { 3361d7728c96SJan Schmidt int ret = 0; 3362d7728c96SJan Schmidt int size; 3363d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3364d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3365d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3366d24a67b2SZygo Blaxell bool ignore_offset; 3367d7728c96SJan Schmidt 3368d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3369d7728c96SJan Schmidt return -EPERM; 3370d7728c96SJan Schmidt 3371d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 33727b9ea627SShailendra Verma if (IS_ERR(loi)) 33737b9ea627SShailendra Verma return PTR_ERR(loi); 3374d7728c96SJan Schmidt 3375d24a67b2SZygo Blaxell if (version == 1) { 3376d24a67b2SZygo Blaxell ignore_offset = false; 3377b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 3378d24a67b2SZygo Blaxell } else { 3379d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 3380d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 3381d24a67b2SZygo Blaxell ret = -EINVAL; 3382d24a67b2SZygo Blaxell goto out_loi; 3383d24a67b2SZygo Blaxell } 3384d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 3385d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 3386d24a67b2SZygo Blaxell ret = -EINVAL; 3387d24a67b2SZygo Blaxell goto out_loi; 3388d24a67b2SZygo Blaxell } 3389d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 3390b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 3391d24a67b2SZygo Blaxell } 3392d24a67b2SZygo Blaxell 3393418ffb9eSAnand Jain inodes = init_data_container(size); 3394418ffb9eSAnand Jain if (IS_ERR(inodes)) { 3395418ffb9eSAnand Jain ret = PTR_ERR(inodes); 3396418ffb9eSAnand Jain goto out_loi; 3397418ffb9eSAnand Jain } 3398418ffb9eSAnand Jain 3399d7728c96SJan Schmidt path = btrfs_alloc_path(); 3400d7728c96SJan Schmidt if (!path) { 3401d7728c96SJan Schmidt ret = -ENOMEM; 3402d7728c96SJan Schmidt goto out; 3403d7728c96SJan Schmidt } 34042ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 3405e3059ec0SDavid Sterba inodes, ignore_offset); 3406418ffb9eSAnand Jain btrfs_free_path(path); 3407df031f07SLiu Bo if (ret == -EINVAL) 3408d7728c96SJan Schmidt ret = -ENOENT; 3409d7728c96SJan Schmidt if (ret < 0) 3410d7728c96SJan Schmidt goto out; 3411d7728c96SJan Schmidt 3412718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 3413718dc5faSOmar Sandoval size); 3414d7728c96SJan Schmidt if (ret) 3415d7728c96SJan Schmidt ret = -EFAULT; 3416d7728c96SJan Schmidt 3417d7728c96SJan Schmidt out: 3418f54de068SDavid Sterba kvfree(inodes); 3419d24a67b2SZygo Blaxell out_loi: 3420d7728c96SJan Schmidt kfree(loi); 3421d7728c96SJan Schmidt 3422d7728c96SJan Schmidt return ret; 3423d7728c96SJan Schmidt } 3424d7728c96SJan Schmidt 3425008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 3426c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3427c9e9f97bSIlya Dryomov { 3428c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3429c9e9f97bSIlya Dryomov 3430c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3431c9e9f97bSIlya Dryomov 34323009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 3433837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3434837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3435837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3436a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3437a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3438837d5b6eSIlya Dryomov 3439c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3440c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3441c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 344219a39dceSIlya Dryomov 344319a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 344419a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 344519a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 3446c9e9f97bSIlya Dryomov } 3447c9e9f97bSIlya Dryomov 344843dd529aSDavid Sterba /* 34497fb10ed8SNikolay Borisov * Try to acquire fs_info::balance_mutex as well as set BTRFS_EXLCOP_BALANCE as 34507fb10ed8SNikolay Borisov * required. 34517fb10ed8SNikolay Borisov * 34527fb10ed8SNikolay Borisov * @fs_info: the filesystem 34537fb10ed8SNikolay Borisov * @excl_acquired: ptr to boolean value which is set to false in case balance 34547fb10ed8SNikolay Borisov * is being resumed 34557fb10ed8SNikolay Borisov * 34567fb10ed8SNikolay Borisov * Return 0 on success in which case both fs_info::balance is acquired as well 34577fb10ed8SNikolay Borisov * as exclusive ops are blocked. In case of failure return an error code. 34587fb10ed8SNikolay Borisov */ 34597fb10ed8SNikolay Borisov static int btrfs_try_lock_balance(struct btrfs_fs_info *fs_info, bool *excl_acquired) 34607fb10ed8SNikolay Borisov { 34617fb10ed8SNikolay Borisov int ret; 34627fb10ed8SNikolay Borisov 34637fb10ed8SNikolay Borisov /* 34647fb10ed8SNikolay Borisov * Exclusive operation is locked. Three possibilities: 34657fb10ed8SNikolay Borisov * (1) some other op is running 34667fb10ed8SNikolay Borisov * (2) balance is running 34677fb10ed8SNikolay Borisov * (3) balance is paused -- special case (think resume) 34687fb10ed8SNikolay Borisov */ 34697fb10ed8SNikolay Borisov while (1) { 34707fb10ed8SNikolay Borisov if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 34717fb10ed8SNikolay Borisov *excl_acquired = true; 34727fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 34737fb10ed8SNikolay Borisov return 0; 34747fb10ed8SNikolay Borisov } 34757fb10ed8SNikolay Borisov 34767fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 34777fb10ed8SNikolay Borisov if (fs_info->balance_ctl) { 34787fb10ed8SNikolay Borisov /* This is either (2) or (3) */ 34797fb10ed8SNikolay Borisov if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 34807fb10ed8SNikolay Borisov /* This is (2) */ 34817fb10ed8SNikolay Borisov ret = -EINPROGRESS; 34827fb10ed8SNikolay Borisov goto out_failure; 34837fb10ed8SNikolay Borisov 34847fb10ed8SNikolay Borisov } else { 34857fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 34867fb10ed8SNikolay Borisov /* 34877fb10ed8SNikolay Borisov * Lock released to allow other waiters to 34887fb10ed8SNikolay Borisov * continue, we'll reexamine the status again. 34897fb10ed8SNikolay Borisov */ 34907fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 34917fb10ed8SNikolay Borisov 34927fb10ed8SNikolay Borisov if (fs_info->balance_ctl && 34937fb10ed8SNikolay Borisov !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 34947fb10ed8SNikolay Borisov /* This is (3) */ 34957fb10ed8SNikolay Borisov *excl_acquired = false; 34967fb10ed8SNikolay Borisov return 0; 34977fb10ed8SNikolay Borisov } 34987fb10ed8SNikolay Borisov } 34997fb10ed8SNikolay Borisov } else { 35007fb10ed8SNikolay Borisov /* This is (1) */ 35017fb10ed8SNikolay Borisov ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 35027fb10ed8SNikolay Borisov goto out_failure; 35037fb10ed8SNikolay Borisov } 35047fb10ed8SNikolay Borisov 35057fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 35067fb10ed8SNikolay Borisov } 35077fb10ed8SNikolay Borisov 35087fb10ed8SNikolay Borisov out_failure: 35097fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 35107fb10ed8SNikolay Borisov *excl_acquired = false; 35117fb10ed8SNikolay Borisov return ret; 35127fb10ed8SNikolay Borisov } 35137fb10ed8SNikolay Borisov 35149ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3515c9e9f97bSIlya Dryomov { 3516496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3517c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3518c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3519c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3520099aa972SNikolay Borisov bool need_unlock = true; 3521c9e9f97bSIlya Dryomov int ret; 3522c9e9f97bSIlya Dryomov 3523c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3524c9e9f97bSIlya Dryomov return -EPERM; 3525c9e9f97bSIlya Dryomov 3526e54bfa31SLiu Bo ret = mnt_want_write_file(file); 35279ba1f6e4SLiu Bo if (ret) 35289ba1f6e4SLiu Bo return ret; 35299ba1f6e4SLiu Bo 3530d8645462SNikolay Borisov bargs = memdup_user(arg, sizeof(*bargs)); 3531d8645462SNikolay Borisov if (IS_ERR(bargs)) { 3532d8645462SNikolay Borisov ret = PTR_ERR(bargs); 3533d8645462SNikolay Borisov bargs = NULL; 3534d8645462SNikolay Borisov goto out; 3535d8645462SNikolay Borisov } 3536d8645462SNikolay Borisov 3537099aa972SNikolay Borisov ret = btrfs_try_lock_balance(fs_info, &need_unlock); 3538099aa972SNikolay Borisov if (ret) 3539ed0fb78fSIlya Dryomov goto out; 3540ed0fb78fSIlya Dryomov 3541099aa972SNikolay Borisov lockdep_assert_held(&fs_info->balance_mutex); 3542099aa972SNikolay Borisov 3543de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3544de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3545de322263SIlya Dryomov ret = -ENOTCONN; 3546d8645462SNikolay Borisov goto out_unlock; 3547de322263SIlya Dryomov } 3548de322263SIlya Dryomov 3549de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3550de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3551de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3552de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3553efc0e69cSNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE); 3554de322263SIlya Dryomov 3555de322263SIlya Dryomov goto do_balance; 3556de322263SIlya Dryomov } 3557c9e9f97bSIlya Dryomov 3558d8645462SNikolay Borisov if (bargs->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 3559d8645462SNikolay Borisov ret = -EINVAL; 3560d8645462SNikolay Borisov goto out_unlock; 3561c9e9f97bSIlya Dryomov } 3562c9e9f97bSIlya Dryomov 3563ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3564837d5b6eSIlya Dryomov ret = -EINPROGRESS; 3565d8645462SNikolay Borisov goto out_unlock; 3566837d5b6eSIlya Dryomov } 3567837d5b6eSIlya Dryomov 35688d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 3569c9e9f97bSIlya Dryomov if (!bctl) { 3570c9e9f97bSIlya Dryomov ret = -ENOMEM; 3571d8645462SNikolay Borisov goto out_unlock; 3572c9e9f97bSIlya Dryomov } 3573c9e9f97bSIlya Dryomov 3574c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 3575c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 3576c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 3577c9e9f97bSIlya Dryomov 3578c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 3579de322263SIlya Dryomov do_balance: 3580c9e9f97bSIlya Dryomov /* 3581c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 3582c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 3583c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 3584c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 3585c9e9f97bSIlya Dryomov */ 3586ed0fb78fSIlya Dryomov need_unlock = false; 3587ed0fb78fSIlya Dryomov 35886fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 35890f89abf5SChristian Engelmayer bctl = NULL; 3590ed0fb78fSIlya Dryomov 359139864601SNikolay Borisov if (ret == 0 || ret == -ECANCELED) { 3592c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 3593c9e9f97bSIlya Dryomov ret = -EFAULT; 3594c9e9f97bSIlya Dryomov } 3595c9e9f97bSIlya Dryomov 35960f89abf5SChristian Engelmayer kfree(bctl); 3597ed0fb78fSIlya Dryomov out_unlock: 3598c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3599ed0fb78fSIlya Dryomov if (need_unlock) 3600c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3601ed0fb78fSIlya Dryomov out: 3602e54bfa31SLiu Bo mnt_drop_write_file(file); 3603d8645462SNikolay Borisov kfree(bargs); 3604c9e9f97bSIlya Dryomov return ret; 3605c9e9f97bSIlya Dryomov } 3606c9e9f97bSIlya Dryomov 36072ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 3608837d5b6eSIlya Dryomov { 3609837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3610837d5b6eSIlya Dryomov return -EPERM; 3611837d5b6eSIlya Dryomov 3612837d5b6eSIlya Dryomov switch (cmd) { 3613837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 36140b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 3615a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 36160b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 3617837d5b6eSIlya Dryomov } 3618837d5b6eSIlya Dryomov 3619837d5b6eSIlya Dryomov return -EINVAL; 3620837d5b6eSIlya Dryomov } 3621837d5b6eSIlya Dryomov 36222ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 362319a39dceSIlya Dryomov void __user *arg) 362419a39dceSIlya Dryomov { 362519a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 362619a39dceSIlya Dryomov int ret = 0; 362719a39dceSIlya Dryomov 362819a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 362919a39dceSIlya Dryomov return -EPERM; 363019a39dceSIlya Dryomov 363119a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 363219a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 363319a39dceSIlya Dryomov ret = -ENOTCONN; 363419a39dceSIlya Dryomov goto out; 363519a39dceSIlya Dryomov } 363619a39dceSIlya Dryomov 36378d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 363819a39dceSIlya Dryomov if (!bargs) { 363919a39dceSIlya Dryomov ret = -ENOMEM; 364019a39dceSIlya Dryomov goto out; 364119a39dceSIlya Dryomov } 364219a39dceSIlya Dryomov 3643008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 364419a39dceSIlya Dryomov 364519a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 364619a39dceSIlya Dryomov ret = -EFAULT; 364719a39dceSIlya Dryomov 364819a39dceSIlya Dryomov kfree(bargs); 364919a39dceSIlya Dryomov out: 365019a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 365119a39dceSIlya Dryomov return ret; 365219a39dceSIlya Dryomov } 365319a39dceSIlya Dryomov 3654905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 36555d13a37bSArne Jansen { 36560b246afaSJeff Mahoney struct inode *inode = file_inode(file); 36570b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 36585d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 36595d13a37bSArne Jansen int ret; 36605d13a37bSArne Jansen 36615d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 36625d13a37bSArne Jansen return -EPERM; 36635d13a37bSArne Jansen 3664905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3665905b0ddaSMiao Xie if (ret) 3666905b0ddaSMiao Xie return ret; 36675d13a37bSArne Jansen 36685d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3669905b0ddaSMiao Xie if (IS_ERR(sa)) { 3670905b0ddaSMiao Xie ret = PTR_ERR(sa); 3671905b0ddaSMiao Xie goto drop_write; 3672905b0ddaSMiao Xie } 36735d13a37bSArne Jansen 36740b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 36755d13a37bSArne Jansen 36765d13a37bSArne Jansen switch (sa->cmd) { 36775d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 3678340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 36795d13a37bSArne Jansen break; 36805d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 3681340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 36825d13a37bSArne Jansen break; 36835d13a37bSArne Jansen default: 36845d13a37bSArne Jansen ret = -EINVAL; 36855d13a37bSArne Jansen break; 36865d13a37bSArne Jansen } 36875d13a37bSArne Jansen 36885d13a37bSArne Jansen kfree(sa); 36890b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 3690905b0ddaSMiao Xie drop_write: 3691905b0ddaSMiao Xie mnt_drop_write_file(file); 36925d13a37bSArne Jansen return ret; 36935d13a37bSArne Jansen } 36945d13a37bSArne Jansen 3695905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 36965d13a37bSArne Jansen { 36970b246afaSJeff Mahoney struct inode *inode = file_inode(file); 36980b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 36990b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 37005d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 37015d13a37bSArne Jansen struct btrfs_trans_handle *trans; 37025d13a37bSArne Jansen int ret; 37035d13a37bSArne Jansen int err; 37045d13a37bSArne Jansen 37055d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 37065d13a37bSArne Jansen return -EPERM; 37075d13a37bSArne Jansen 3708905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3709905b0ddaSMiao Xie if (ret) 3710905b0ddaSMiao Xie return ret; 37115d13a37bSArne Jansen 37125d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3713905b0ddaSMiao Xie if (IS_ERR(sa)) { 3714905b0ddaSMiao Xie ret = PTR_ERR(sa); 3715905b0ddaSMiao Xie goto drop_write; 3716905b0ddaSMiao Xie } 37175d13a37bSArne Jansen 37185d13a37bSArne Jansen trans = btrfs_join_transaction(root); 37195d13a37bSArne Jansen if (IS_ERR(trans)) { 37205d13a37bSArne Jansen ret = PTR_ERR(trans); 37215d13a37bSArne Jansen goto out; 37225d13a37bSArne Jansen } 37235d13a37bSArne Jansen 37245d13a37bSArne Jansen if (sa->assign) { 37259f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 37265d13a37bSArne Jansen } else { 372739616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 37285d13a37bSArne Jansen } 37295d13a37bSArne Jansen 3730e082f563SQu Wenruo /* update qgroup status and info */ 3731280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 3732e082f563SQu Wenruo if (err < 0) 37330b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 3734ad8403dfSAnand Jain "failed to update qgroup status and info"); 37353a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 37365d13a37bSArne Jansen if (err && !ret) 37375d13a37bSArne Jansen ret = err; 37385d13a37bSArne Jansen 37395d13a37bSArne Jansen out: 37405d13a37bSArne Jansen kfree(sa); 3741905b0ddaSMiao Xie drop_write: 3742905b0ddaSMiao Xie mnt_drop_write_file(file); 37435d13a37bSArne Jansen return ret; 37445d13a37bSArne Jansen } 37455d13a37bSArne Jansen 3746905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 37475d13a37bSArne Jansen { 37480b246afaSJeff Mahoney struct inode *inode = file_inode(file); 37490b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 37505d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 37515d13a37bSArne Jansen struct btrfs_trans_handle *trans; 37525d13a37bSArne Jansen int ret; 37535d13a37bSArne Jansen int err; 37545d13a37bSArne Jansen 37555d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 37565d13a37bSArne Jansen return -EPERM; 37575d13a37bSArne Jansen 3758905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3759905b0ddaSMiao Xie if (ret) 3760905b0ddaSMiao Xie return ret; 37615d13a37bSArne Jansen 37625d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3763905b0ddaSMiao Xie if (IS_ERR(sa)) { 3764905b0ddaSMiao Xie ret = PTR_ERR(sa); 3765905b0ddaSMiao Xie goto drop_write; 3766905b0ddaSMiao Xie } 37675d13a37bSArne Jansen 3768d86e56cfSMiao Xie if (!sa->qgroupid) { 3769d86e56cfSMiao Xie ret = -EINVAL; 3770d86e56cfSMiao Xie goto out; 3771d86e56cfSMiao Xie } 3772d86e56cfSMiao Xie 37735d13a37bSArne Jansen trans = btrfs_join_transaction(root); 37745d13a37bSArne Jansen if (IS_ERR(trans)) { 37755d13a37bSArne Jansen ret = PTR_ERR(trans); 37765d13a37bSArne Jansen goto out; 37775d13a37bSArne Jansen } 37785d13a37bSArne Jansen 37795d13a37bSArne Jansen if (sa->create) { 378049a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 37815d13a37bSArne Jansen } else { 37823efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 37835d13a37bSArne Jansen } 37845d13a37bSArne Jansen 37853a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 37865d13a37bSArne Jansen if (err && !ret) 37875d13a37bSArne Jansen ret = err; 37885d13a37bSArne Jansen 37895d13a37bSArne Jansen out: 37905d13a37bSArne Jansen kfree(sa); 3791905b0ddaSMiao Xie drop_write: 3792905b0ddaSMiao Xie mnt_drop_write_file(file); 37935d13a37bSArne Jansen return ret; 37945d13a37bSArne Jansen } 37955d13a37bSArne Jansen 3796905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 37975d13a37bSArne Jansen { 37980b246afaSJeff Mahoney struct inode *inode = file_inode(file); 37990b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 38005d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 38015d13a37bSArne Jansen struct btrfs_trans_handle *trans; 38025d13a37bSArne Jansen int ret; 38035d13a37bSArne Jansen int err; 38045d13a37bSArne Jansen u64 qgroupid; 38055d13a37bSArne Jansen 38065d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 38075d13a37bSArne Jansen return -EPERM; 38085d13a37bSArne Jansen 3809905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3810905b0ddaSMiao Xie if (ret) 3811905b0ddaSMiao Xie return ret; 38125d13a37bSArne Jansen 38135d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3814905b0ddaSMiao Xie if (IS_ERR(sa)) { 3815905b0ddaSMiao Xie ret = PTR_ERR(sa); 3816905b0ddaSMiao Xie goto drop_write; 3817905b0ddaSMiao Xie } 38185d13a37bSArne Jansen 38195d13a37bSArne Jansen trans = btrfs_join_transaction(root); 38205d13a37bSArne Jansen if (IS_ERR(trans)) { 38215d13a37bSArne Jansen ret = PTR_ERR(trans); 38225d13a37bSArne Jansen goto out; 38235d13a37bSArne Jansen } 38245d13a37bSArne Jansen 38255d13a37bSArne Jansen qgroupid = sa->qgroupid; 38265d13a37bSArne Jansen if (!qgroupid) { 38275d13a37bSArne Jansen /* take the current subvol as qgroup */ 38285d13a37bSArne Jansen qgroupid = root->root_key.objectid; 38295d13a37bSArne Jansen } 38305d13a37bSArne Jansen 3831f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 38325d13a37bSArne Jansen 38333a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 38345d13a37bSArne Jansen if (err && !ret) 38355d13a37bSArne Jansen ret = err; 38365d13a37bSArne Jansen 38375d13a37bSArne Jansen out: 38385d13a37bSArne Jansen kfree(sa); 3839905b0ddaSMiao Xie drop_write: 3840905b0ddaSMiao Xie mnt_drop_write_file(file); 38415d13a37bSArne Jansen return ret; 38425d13a37bSArne Jansen } 38435d13a37bSArne Jansen 38442f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 38452f232036SJan Schmidt { 38460b246afaSJeff Mahoney struct inode *inode = file_inode(file); 38470b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 38482f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 38492f232036SJan Schmidt int ret; 38502f232036SJan Schmidt 38512f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 38522f232036SJan Schmidt return -EPERM; 38532f232036SJan Schmidt 38542f232036SJan Schmidt ret = mnt_want_write_file(file); 38552f232036SJan Schmidt if (ret) 38562f232036SJan Schmidt return ret; 38572f232036SJan Schmidt 38582f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 38592f232036SJan Schmidt if (IS_ERR(qsa)) { 38602f232036SJan Schmidt ret = PTR_ERR(qsa); 38612f232036SJan Schmidt goto drop_write; 38622f232036SJan Schmidt } 38632f232036SJan Schmidt 38642f232036SJan Schmidt if (qsa->flags) { 38652f232036SJan Schmidt ret = -EINVAL; 38662f232036SJan Schmidt goto out; 38672f232036SJan Schmidt } 38682f232036SJan Schmidt 38690b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 38702f232036SJan Schmidt 38712f232036SJan Schmidt out: 38722f232036SJan Schmidt kfree(qsa); 38732f232036SJan Schmidt drop_write: 38742f232036SJan Schmidt mnt_drop_write_file(file); 38752f232036SJan Schmidt return ret; 38762f232036SJan Schmidt } 38772f232036SJan Schmidt 3878b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 3879b929c1d8SMarcos Paulo de Souza void __user *arg) 38802f232036SJan Schmidt { 38810afb603aSGoldwyn Rodrigues struct btrfs_ioctl_quota_rescan_args qsa = {0}; 38822f232036SJan Schmidt 38832f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 38842f232036SJan Schmidt return -EPERM; 38852f232036SJan Schmidt 38860b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 38870afb603aSGoldwyn Rodrigues qsa.flags = 1; 38880afb603aSGoldwyn Rodrigues qsa.progress = fs_info->qgroup_rescan_progress.objectid; 38892f232036SJan Schmidt } 38902f232036SJan Schmidt 38910afb603aSGoldwyn Rodrigues if (copy_to_user(arg, &qsa, sizeof(qsa))) 3892991a3daeSAnand Jain return -EFAULT; 38932f232036SJan Schmidt 3894991a3daeSAnand Jain return 0; 38952f232036SJan Schmidt } 38962f232036SJan Schmidt 3897b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 3898b929c1d8SMarcos Paulo de Souza void __user *arg) 389957254b6eSJan Schmidt { 390057254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 390157254b6eSJan Schmidt return -EPERM; 390257254b6eSJan Schmidt 39030b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 390457254b6eSJan Schmidt } 390557254b6eSJan Schmidt 3906abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 3907e4fed17aSChristian Brauner struct user_namespace *mnt_userns, 3908abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 39098ea05e3aSAlexander Block { 3910496ad9aaSAl Viro struct inode *inode = file_inode(file); 39110b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 39128ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 39138ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 39148ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 391595582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 39168ea05e3aSAlexander Block int ret = 0; 3917dd5f9615SStefan Behrens int received_uuid_changed; 39188ea05e3aSAlexander Block 3919e4fed17aSChristian Brauner if (!inode_owner_or_capable(mnt_userns, inode)) 3920bd60ea0fSDavid Sterba return -EPERM; 3921bd60ea0fSDavid Sterba 39228ea05e3aSAlexander Block ret = mnt_want_write_file(file); 39238ea05e3aSAlexander Block if (ret < 0) 39248ea05e3aSAlexander Block return ret; 39258ea05e3aSAlexander Block 39260b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 39278ea05e3aSAlexander Block 39284a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 39298ea05e3aSAlexander Block ret = -EINVAL; 39308ea05e3aSAlexander Block goto out; 39318ea05e3aSAlexander Block } 39328ea05e3aSAlexander Block 39338ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 39348ea05e3aSAlexander Block ret = -EROFS; 39358ea05e3aSAlexander Block goto out; 39368ea05e3aSAlexander Block } 39378ea05e3aSAlexander Block 3938dd5f9615SStefan Behrens /* 3939dd5f9615SStefan Behrens * 1 - root item 3940dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 3941dd5f9615SStefan Behrens */ 3942dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 39438ea05e3aSAlexander Block if (IS_ERR(trans)) { 39448ea05e3aSAlexander Block ret = PTR_ERR(trans); 39458ea05e3aSAlexander Block trans = NULL; 39468ea05e3aSAlexander Block goto out; 39478ea05e3aSAlexander Block } 39488ea05e3aSAlexander Block 39498ea05e3aSAlexander Block sa->rtransid = trans->transid; 39508ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 39518ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 39528ea05e3aSAlexander Block 3953dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 3954dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 3955dd5f9615SStefan Behrens if (received_uuid_changed && 3956d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 3957d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 3958dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 3959dd5f9615SStefan Behrens root->root_key.objectid); 3960d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 3961d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 3962d87ff758SNikolay Borisov btrfs_end_transaction(trans); 3963d87ff758SNikolay Borisov goto out; 3964d87ff758SNikolay Borisov } 3965d87ff758SNikolay Borisov } 39668ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 39678ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 39688ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 39693cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 39703cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 39713cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 39723cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 39738ea05e3aSAlexander Block 39740b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 39758ea05e3aSAlexander Block &root->root_key, &root->root_item); 39768ea05e3aSAlexander Block if (ret < 0) { 39773a45bb20SJeff Mahoney btrfs_end_transaction(trans); 39788ea05e3aSAlexander Block goto out; 3979dd5f9615SStefan Behrens } 3980dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 3981cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 3982dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 3983dd5f9615SStefan Behrens root->root_key.objectid); 3984dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 398566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 3986efd38150SNikolay Borisov btrfs_end_transaction(trans); 3987dd5f9615SStefan Behrens goto out; 3988dd5f9615SStefan Behrens } 3989dd5f9615SStefan Behrens } 39903a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 3991abccd00fSHugo Mills out: 39920b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 3993abccd00fSHugo Mills mnt_drop_write_file(file); 3994abccd00fSHugo Mills return ret; 3995abccd00fSHugo Mills } 3996abccd00fSHugo Mills 3997abccd00fSHugo Mills #ifdef CONFIG_64BIT 3998abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 3999abccd00fSHugo Mills void __user *arg) 4000abccd00fSHugo Mills { 4001abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4002abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4003abccd00fSHugo Mills int ret = 0; 4004abccd00fSHugo Mills 4005abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 40067b9ea627SShailendra Verma if (IS_ERR(args32)) 40077b9ea627SShailendra Verma return PTR_ERR(args32); 4008abccd00fSHugo Mills 40098d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 401084dbeb87SDan Carpenter if (!args64) { 401184dbeb87SDan Carpenter ret = -ENOMEM; 4012abccd00fSHugo Mills goto out; 4013abccd00fSHugo Mills } 4014abccd00fSHugo Mills 4015abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4016abccd00fSHugo Mills args64->stransid = args32->stransid; 4017abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4018abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4019abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4020abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4021abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4022abccd00fSHugo Mills args64->flags = args32->flags; 4023abccd00fSHugo Mills 4024e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), args64); 4025abccd00fSHugo Mills if (ret) 4026abccd00fSHugo Mills goto out; 4027abccd00fSHugo Mills 4028abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4029abccd00fSHugo Mills args32->stransid = args64->stransid; 4030abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4031abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4032abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4033abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4034abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4035abccd00fSHugo Mills args32->flags = args64->flags; 4036abccd00fSHugo Mills 4037abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4038abccd00fSHugo Mills if (ret) 4039abccd00fSHugo Mills ret = -EFAULT; 4040abccd00fSHugo Mills 4041abccd00fSHugo Mills out: 4042abccd00fSHugo Mills kfree(args32); 4043abccd00fSHugo Mills kfree(args64); 4044abccd00fSHugo Mills return ret; 4045abccd00fSHugo Mills } 4046abccd00fSHugo Mills #endif 4047abccd00fSHugo Mills 4048abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4049abccd00fSHugo Mills void __user *arg) 4050abccd00fSHugo Mills { 4051abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4052abccd00fSHugo Mills int ret = 0; 4053abccd00fSHugo Mills 4054abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 40557b9ea627SShailendra Verma if (IS_ERR(sa)) 40567b9ea627SShailendra Verma return PTR_ERR(sa); 4057abccd00fSHugo Mills 4058e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), sa); 4059abccd00fSHugo Mills 4060abccd00fSHugo Mills if (ret) 4061abccd00fSHugo Mills goto out; 4062abccd00fSHugo Mills 40638ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 40648ea05e3aSAlexander Block if (ret) 40658ea05e3aSAlexander Block ret = -EFAULT; 40668ea05e3aSAlexander Block 40678ea05e3aSAlexander Block out: 40688ea05e3aSAlexander Block kfree(sa); 40698ea05e3aSAlexander Block return ret; 40708ea05e3aSAlexander Block } 40718ea05e3aSAlexander Block 4072b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4073b929c1d8SMarcos Paulo de Souza void __user *arg) 4074867ab667Sjeff.liu { 4075a1b83ac5SAnand Jain size_t len; 4076867ab667Sjeff.liu int ret; 4077a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4078a1b83ac5SAnand Jain 40790b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 40800b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 40810b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4082a1b83ac5SAnand Jain 4083a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4084867ab667Sjeff.liu 4085867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 40860b246afaSJeff Mahoney btrfs_warn(fs_info, 40870b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 40880b246afaSJeff Mahoney --len); 4089867ab667Sjeff.liu } 4090867ab667Sjeff.liu 4091867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4092867ab667Sjeff.liu 4093867ab667Sjeff.liu return ret ? -EFAULT : 0; 4094867ab667Sjeff.liu } 4095867ab667Sjeff.liu 4096a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4097a8bfd4abSjeff.liu { 40980b246afaSJeff Mahoney struct inode *inode = file_inode(file); 40990b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41000b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 41010b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4102a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4103a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4104a8bfd4abSjeff.liu int ret; 4105a8bfd4abSjeff.liu 4106a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4107a8bfd4abSjeff.liu return -EPERM; 4108a8bfd4abSjeff.liu 4109a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4110a8bfd4abSjeff.liu return -EFAULT; 4111a8bfd4abSjeff.liu 4112a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 41130b246afaSJeff Mahoney btrfs_err(fs_info, 41145d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4115a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4116a8bfd4abSjeff.liu return -EINVAL; 4117a8bfd4abSjeff.liu } 4118a8bfd4abSjeff.liu 4119a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4120a8bfd4abSjeff.liu if (ret) 4121a8bfd4abSjeff.liu return ret; 4122a8bfd4abSjeff.liu 4123a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4124a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4125a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4126a8bfd4abSjeff.liu goto out_unlock; 4127a8bfd4abSjeff.liu } 4128a8bfd4abSjeff.liu 41290b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4130a8bfd4abSjeff.liu strcpy(super_block->label, label); 41310b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 41323a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4133a8bfd4abSjeff.liu 4134a8bfd4abSjeff.liu out_unlock: 4135a8bfd4abSjeff.liu mnt_drop_write_file(file); 4136a8bfd4abSjeff.liu return ret; 4137a8bfd4abSjeff.liu } 4138a8bfd4abSjeff.liu 41392eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 41402eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 41412eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 41422eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 41432eaa055fSJeff Mahoney 4144d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 41452eaa055fSJeff Mahoney { 41464d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 41472eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 41482eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 41492eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 41502eaa055fSJeff Mahoney }; 41512eaa055fSJeff Mahoney 41522eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 41532eaa055fSJeff Mahoney return -EFAULT; 41542eaa055fSJeff Mahoney 41552eaa055fSJeff Mahoney return 0; 41562eaa055fSJeff Mahoney } 41572eaa055fSJeff Mahoney 4158b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4159b929c1d8SMarcos Paulo de Souza void __user *arg) 41602eaa055fSJeff Mahoney { 41610b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 41622eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 41632eaa055fSJeff Mahoney 41642eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 41652eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 41662eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 41672eaa055fSJeff Mahoney 41682eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 41692eaa055fSJeff Mahoney return -EFAULT; 41702eaa055fSJeff Mahoney 41712eaa055fSJeff Mahoney return 0; 41722eaa055fSJeff Mahoney } 41732eaa055fSJeff Mahoney 41742ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 41753b02a68aSJeff Mahoney enum btrfs_feature_set set, 41762eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 41772eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 41782eaa055fSJeff Mahoney { 4179f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 41803b02a68aSJeff Mahoney char *names; 41812eaa055fSJeff Mahoney u64 disallowed, unsupported; 41822eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 41832eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 41842eaa055fSJeff Mahoney 41852eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 41862eaa055fSJeff Mahoney if (unsupported) { 41873b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 41883b02a68aSJeff Mahoney if (names) { 41890b246afaSJeff Mahoney btrfs_warn(fs_info, 41903b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 41913b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 41923b02a68aSJeff Mahoney kfree(names); 41933b02a68aSJeff Mahoney } else 41940b246afaSJeff Mahoney btrfs_warn(fs_info, 41952eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 41962eaa055fSJeff Mahoney type, unsupported); 41972eaa055fSJeff Mahoney return -EOPNOTSUPP; 41982eaa055fSJeff Mahoney } 41992eaa055fSJeff Mahoney 42002eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 42012eaa055fSJeff Mahoney if (disallowed) { 42023b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 42033b02a68aSJeff Mahoney if (names) { 42040b246afaSJeff Mahoney btrfs_warn(fs_info, 42053b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 42063b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 42073b02a68aSJeff Mahoney kfree(names); 42083b02a68aSJeff Mahoney } else 42090b246afaSJeff Mahoney btrfs_warn(fs_info, 42102eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 42112eaa055fSJeff Mahoney type, disallowed); 42122eaa055fSJeff Mahoney return -EPERM; 42132eaa055fSJeff Mahoney } 42142eaa055fSJeff Mahoney 42152eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 42162eaa055fSJeff Mahoney if (disallowed) { 42173b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 42183b02a68aSJeff Mahoney if (names) { 42190b246afaSJeff Mahoney btrfs_warn(fs_info, 42203b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 42213b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 42223b02a68aSJeff Mahoney kfree(names); 42233b02a68aSJeff Mahoney } else 42240b246afaSJeff Mahoney btrfs_warn(fs_info, 42252eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 42262eaa055fSJeff Mahoney type, disallowed); 42272eaa055fSJeff Mahoney return -EPERM; 42282eaa055fSJeff Mahoney } 42292eaa055fSJeff Mahoney 42302eaa055fSJeff Mahoney return 0; 42312eaa055fSJeff Mahoney } 42322eaa055fSJeff Mahoney 42332ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 42342ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 42352eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 42362eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 42372eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 42382eaa055fSJeff Mahoney 42392eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 42402eaa055fSJeff Mahoney { 42410b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42420b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42430b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42440b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 42452eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 42462eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 42472eaa055fSJeff Mahoney u64 newflags; 42482eaa055fSJeff Mahoney int ret; 42492eaa055fSJeff Mahoney 42502eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 42512eaa055fSJeff Mahoney return -EPERM; 42522eaa055fSJeff Mahoney 42532eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 42542eaa055fSJeff Mahoney return -EFAULT; 42552eaa055fSJeff Mahoney 42562eaa055fSJeff Mahoney /* Nothing to do */ 42572eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 42582eaa055fSJeff Mahoney !flags[0].incompat_flags) 42592eaa055fSJeff Mahoney return 0; 42602eaa055fSJeff Mahoney 42612ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 42622eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 42632eaa055fSJeff Mahoney if (ret) 42642eaa055fSJeff Mahoney return ret; 42652eaa055fSJeff Mahoney 42662ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 42672eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 42682eaa055fSJeff Mahoney if (ret) 42692eaa055fSJeff Mahoney return ret; 42702eaa055fSJeff Mahoney 42712ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 42722eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 42732eaa055fSJeff Mahoney if (ret) 42742eaa055fSJeff Mahoney return ret; 42752eaa055fSJeff Mahoney 42767ab19625SDavid Sterba ret = mnt_want_write_file(file); 42777ab19625SDavid Sterba if (ret) 42787ab19625SDavid Sterba return ret; 42797ab19625SDavid Sterba 42808051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 42817ab19625SDavid Sterba if (IS_ERR(trans)) { 42827ab19625SDavid Sterba ret = PTR_ERR(trans); 42837ab19625SDavid Sterba goto out_drop_write; 42847ab19625SDavid Sterba } 42852eaa055fSJeff Mahoney 42860b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 42872eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 42882eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 42892eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 42902eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 42912eaa055fSJeff Mahoney 42922eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 42932eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 42942eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 42952eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 42962eaa055fSJeff Mahoney 42972eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 42982eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 42992eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 43002eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 43010b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 43022eaa055fSJeff Mahoney 43033a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 43047ab19625SDavid Sterba out_drop_write: 43057ab19625SDavid Sterba mnt_drop_write_file(file); 43067ab19625SDavid Sterba 43077ab19625SDavid Sterba return ret; 43082eaa055fSJeff Mahoney } 43092eaa055fSJeff Mahoney 43109ad12305SSahil Kang static int _btrfs_ioctl_send(struct inode *inode, void __user *argp, bool compat) 43112351f431SJosef Bacik { 43122351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 43132351f431SJosef Bacik int ret; 43142351f431SJosef Bacik 43152351f431SJosef Bacik if (compat) { 43162351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 43172351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 43182351f431SJosef Bacik 43192351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 43202351f431SJosef Bacik if (ret) 43212351f431SJosef Bacik return -EFAULT; 43222351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 43232351f431SJosef Bacik if (!arg) 43242351f431SJosef Bacik return -ENOMEM; 43252351f431SJosef Bacik arg->send_fd = args32.send_fd; 43262351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 43272351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 43282351f431SJosef Bacik arg->parent_root = args32.parent_root; 43292351f431SJosef Bacik arg->flags = args32.flags; 43302351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 43312351f431SJosef Bacik sizeof(args32.reserved)); 43322351f431SJosef Bacik #else 43332351f431SJosef Bacik return -ENOTTY; 43342351f431SJosef Bacik #endif 43352351f431SJosef Bacik } else { 43362351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 43372351f431SJosef Bacik if (IS_ERR(arg)) 43382351f431SJosef Bacik return PTR_ERR(arg); 43392351f431SJosef Bacik } 43409ad12305SSahil Kang ret = btrfs_ioctl_send(inode, arg); 43412351f431SJosef Bacik kfree(arg); 43422351f431SJosef Bacik return ret; 43432351f431SJosef Bacik } 43442351f431SJosef Bacik 43451881fba8SOmar Sandoval static int btrfs_ioctl_encoded_read(struct file *file, void __user *argp, 43461881fba8SOmar Sandoval bool compat) 43471881fba8SOmar Sandoval { 43481881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args args = { 0 }; 43491881fba8SOmar Sandoval size_t copy_end_kernel = offsetofend(struct btrfs_ioctl_encoded_io_args, 43501881fba8SOmar Sandoval flags); 43511881fba8SOmar Sandoval size_t copy_end; 43521881fba8SOmar Sandoval struct iovec iovstack[UIO_FASTIOV]; 43531881fba8SOmar Sandoval struct iovec *iov = iovstack; 43541881fba8SOmar Sandoval struct iov_iter iter; 43551881fba8SOmar Sandoval loff_t pos; 43561881fba8SOmar Sandoval struct kiocb kiocb; 43571881fba8SOmar Sandoval ssize_t ret; 43581881fba8SOmar Sandoval 43591881fba8SOmar Sandoval if (!capable(CAP_SYS_ADMIN)) { 43601881fba8SOmar Sandoval ret = -EPERM; 43611881fba8SOmar Sandoval goto out_acct; 43621881fba8SOmar Sandoval } 43631881fba8SOmar Sandoval 43641881fba8SOmar Sandoval if (compat) { 43651881fba8SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 43661881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 args32; 43671881fba8SOmar Sandoval 43681881fba8SOmar Sandoval copy_end = offsetofend(struct btrfs_ioctl_encoded_io_args_32, 43691881fba8SOmar Sandoval flags); 43701881fba8SOmar Sandoval if (copy_from_user(&args32, argp, copy_end)) { 43711881fba8SOmar Sandoval ret = -EFAULT; 43721881fba8SOmar Sandoval goto out_acct; 43731881fba8SOmar Sandoval } 43741881fba8SOmar Sandoval args.iov = compat_ptr(args32.iov); 43751881fba8SOmar Sandoval args.iovcnt = args32.iovcnt; 43761881fba8SOmar Sandoval args.offset = args32.offset; 43771881fba8SOmar Sandoval args.flags = args32.flags; 43781881fba8SOmar Sandoval #else 43791881fba8SOmar Sandoval return -ENOTTY; 43801881fba8SOmar Sandoval #endif 43811881fba8SOmar Sandoval } else { 43821881fba8SOmar Sandoval copy_end = copy_end_kernel; 43831881fba8SOmar Sandoval if (copy_from_user(&args, argp, copy_end)) { 43841881fba8SOmar Sandoval ret = -EFAULT; 43851881fba8SOmar Sandoval goto out_acct; 43861881fba8SOmar Sandoval } 43871881fba8SOmar Sandoval } 43881881fba8SOmar Sandoval if (args.flags != 0) { 43891881fba8SOmar Sandoval ret = -EINVAL; 43901881fba8SOmar Sandoval goto out_acct; 43911881fba8SOmar Sandoval } 43921881fba8SOmar Sandoval 43931881fba8SOmar Sandoval ret = import_iovec(READ, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), 43941881fba8SOmar Sandoval &iov, &iter); 43951881fba8SOmar Sandoval if (ret < 0) 43961881fba8SOmar Sandoval goto out_acct; 43971881fba8SOmar Sandoval 43981881fba8SOmar Sandoval if (iov_iter_count(&iter) == 0) { 43991881fba8SOmar Sandoval ret = 0; 44001881fba8SOmar Sandoval goto out_iov; 44011881fba8SOmar Sandoval } 44021881fba8SOmar Sandoval pos = args.offset; 44031881fba8SOmar Sandoval ret = rw_verify_area(READ, file, &pos, args.len); 44041881fba8SOmar Sandoval if (ret < 0) 44051881fba8SOmar Sandoval goto out_iov; 44061881fba8SOmar Sandoval 44071881fba8SOmar Sandoval init_sync_kiocb(&kiocb, file); 44081881fba8SOmar Sandoval kiocb.ki_pos = pos; 44091881fba8SOmar Sandoval 44101881fba8SOmar Sandoval ret = btrfs_encoded_read(&kiocb, &iter, &args); 44111881fba8SOmar Sandoval if (ret >= 0) { 44121881fba8SOmar Sandoval fsnotify_access(file); 44131881fba8SOmar Sandoval if (copy_to_user(argp + copy_end, 44141881fba8SOmar Sandoval (char *)&args + copy_end_kernel, 44151881fba8SOmar Sandoval sizeof(args) - copy_end_kernel)) 44161881fba8SOmar Sandoval ret = -EFAULT; 44171881fba8SOmar Sandoval } 44181881fba8SOmar Sandoval 44191881fba8SOmar Sandoval out_iov: 44201881fba8SOmar Sandoval kfree(iov); 44211881fba8SOmar Sandoval out_acct: 44221881fba8SOmar Sandoval if (ret > 0) 44231881fba8SOmar Sandoval add_rchar(current, ret); 44241881fba8SOmar Sandoval inc_syscr(current); 44251881fba8SOmar Sandoval return ret; 44261881fba8SOmar Sandoval } 44271881fba8SOmar Sandoval 44287c0c7269SOmar Sandoval static int btrfs_ioctl_encoded_write(struct file *file, void __user *argp, bool compat) 44297c0c7269SOmar Sandoval { 44307c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args args; 44317c0c7269SOmar Sandoval struct iovec iovstack[UIO_FASTIOV]; 44327c0c7269SOmar Sandoval struct iovec *iov = iovstack; 44337c0c7269SOmar Sandoval struct iov_iter iter; 44347c0c7269SOmar Sandoval loff_t pos; 44357c0c7269SOmar Sandoval struct kiocb kiocb; 44367c0c7269SOmar Sandoval ssize_t ret; 44377c0c7269SOmar Sandoval 44387c0c7269SOmar Sandoval if (!capable(CAP_SYS_ADMIN)) { 44397c0c7269SOmar Sandoval ret = -EPERM; 44407c0c7269SOmar Sandoval goto out_acct; 44417c0c7269SOmar Sandoval } 44427c0c7269SOmar Sandoval 44437c0c7269SOmar Sandoval if (!(file->f_mode & FMODE_WRITE)) { 44447c0c7269SOmar Sandoval ret = -EBADF; 44457c0c7269SOmar Sandoval goto out_acct; 44467c0c7269SOmar Sandoval } 44477c0c7269SOmar Sandoval 44487c0c7269SOmar Sandoval if (compat) { 44497c0c7269SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 44507c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 args32; 44517c0c7269SOmar Sandoval 44527c0c7269SOmar Sandoval if (copy_from_user(&args32, argp, sizeof(args32))) { 44537c0c7269SOmar Sandoval ret = -EFAULT; 44547c0c7269SOmar Sandoval goto out_acct; 44557c0c7269SOmar Sandoval } 44567c0c7269SOmar Sandoval args.iov = compat_ptr(args32.iov); 44577c0c7269SOmar Sandoval args.iovcnt = args32.iovcnt; 44587c0c7269SOmar Sandoval args.offset = args32.offset; 44597c0c7269SOmar Sandoval args.flags = args32.flags; 44607c0c7269SOmar Sandoval args.len = args32.len; 44617c0c7269SOmar Sandoval args.unencoded_len = args32.unencoded_len; 44627c0c7269SOmar Sandoval args.unencoded_offset = args32.unencoded_offset; 44637c0c7269SOmar Sandoval args.compression = args32.compression; 44647c0c7269SOmar Sandoval args.encryption = args32.encryption; 44657c0c7269SOmar Sandoval memcpy(args.reserved, args32.reserved, sizeof(args.reserved)); 44667c0c7269SOmar Sandoval #else 44677c0c7269SOmar Sandoval return -ENOTTY; 44687c0c7269SOmar Sandoval #endif 44697c0c7269SOmar Sandoval } else { 44707c0c7269SOmar Sandoval if (copy_from_user(&args, argp, sizeof(args))) { 44717c0c7269SOmar Sandoval ret = -EFAULT; 44727c0c7269SOmar Sandoval goto out_acct; 44737c0c7269SOmar Sandoval } 44747c0c7269SOmar Sandoval } 44757c0c7269SOmar Sandoval 44767c0c7269SOmar Sandoval ret = -EINVAL; 44777c0c7269SOmar Sandoval if (args.flags != 0) 44787c0c7269SOmar Sandoval goto out_acct; 44797c0c7269SOmar Sandoval if (memchr_inv(args.reserved, 0, sizeof(args.reserved))) 44807c0c7269SOmar Sandoval goto out_acct; 44817c0c7269SOmar Sandoval if (args.compression == BTRFS_ENCODED_IO_COMPRESSION_NONE && 44827c0c7269SOmar Sandoval args.encryption == BTRFS_ENCODED_IO_ENCRYPTION_NONE) 44837c0c7269SOmar Sandoval goto out_acct; 44847c0c7269SOmar Sandoval if (args.compression >= BTRFS_ENCODED_IO_COMPRESSION_TYPES || 44857c0c7269SOmar Sandoval args.encryption >= BTRFS_ENCODED_IO_ENCRYPTION_TYPES) 44867c0c7269SOmar Sandoval goto out_acct; 44877c0c7269SOmar Sandoval if (args.unencoded_offset > args.unencoded_len) 44887c0c7269SOmar Sandoval goto out_acct; 44897c0c7269SOmar Sandoval if (args.len > args.unencoded_len - args.unencoded_offset) 44907c0c7269SOmar Sandoval goto out_acct; 44917c0c7269SOmar Sandoval 44927c0c7269SOmar Sandoval ret = import_iovec(WRITE, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), 44937c0c7269SOmar Sandoval &iov, &iter); 44947c0c7269SOmar Sandoval if (ret < 0) 44957c0c7269SOmar Sandoval goto out_acct; 44967c0c7269SOmar Sandoval 44977c0c7269SOmar Sandoval file_start_write(file); 44987c0c7269SOmar Sandoval 44997c0c7269SOmar Sandoval if (iov_iter_count(&iter) == 0) { 45007c0c7269SOmar Sandoval ret = 0; 45017c0c7269SOmar Sandoval goto out_end_write; 45027c0c7269SOmar Sandoval } 45037c0c7269SOmar Sandoval pos = args.offset; 45047c0c7269SOmar Sandoval ret = rw_verify_area(WRITE, file, &pos, args.len); 45057c0c7269SOmar Sandoval if (ret < 0) 45067c0c7269SOmar Sandoval goto out_end_write; 45077c0c7269SOmar Sandoval 45087c0c7269SOmar Sandoval init_sync_kiocb(&kiocb, file); 45097c0c7269SOmar Sandoval ret = kiocb_set_rw_flags(&kiocb, 0); 45107c0c7269SOmar Sandoval if (ret) 45117c0c7269SOmar Sandoval goto out_end_write; 45127c0c7269SOmar Sandoval kiocb.ki_pos = pos; 45137c0c7269SOmar Sandoval 45147c0c7269SOmar Sandoval ret = btrfs_do_write_iter(&kiocb, &iter, &args); 45157c0c7269SOmar Sandoval if (ret > 0) 45167c0c7269SOmar Sandoval fsnotify_modify(file); 45177c0c7269SOmar Sandoval 45187c0c7269SOmar Sandoval out_end_write: 45197c0c7269SOmar Sandoval file_end_write(file); 45207c0c7269SOmar Sandoval kfree(iov); 45217c0c7269SOmar Sandoval out_acct: 45227c0c7269SOmar Sandoval if (ret > 0) 45237c0c7269SOmar Sandoval add_wchar(current, ret); 45247c0c7269SOmar Sandoval inc_syscw(current); 45257c0c7269SOmar Sandoval return ret; 45267c0c7269SOmar Sandoval } 45277c0c7269SOmar Sandoval 4528f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4529f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4530f46b5a66SChristoph Hellwig { 45310b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45320b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45330b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 45344bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4535f46b5a66SChristoph Hellwig 4536f46b5a66SChristoph Hellwig switch (cmd) { 45376cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 4538dc408ccdSSahil Kang return btrfs_ioctl_getversion(inode, argp); 453940cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4540b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 454140cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 454240cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4543f7039b1dSLi Dongyang case FITRIM: 4544b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4545f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4546fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4547fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4548fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 45493de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4550fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 45516f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 45526f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 455376dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4554949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4555949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4556949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 45570caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 45589ad12305SSahil Kang return btrfs_ioctl_subvol_getflags(inode, argp); 45590caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 45600caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 45616ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 45626ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4563f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 45641e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 45651e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 45661e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4567f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4568198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4569f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 45702ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 4571f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4572da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 45736b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 45746b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 4575475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 45762ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 4577475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 45782ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 4579ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 45809ad12305SSahil Kang return btrfs_ioctl_tree_search(inode, argp); 4581cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 45829ad12305SSahil Kang return btrfs_ioctl_tree_search_v2(inode, argp); 4583ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4584dc408ccdSSahil Kang return btrfs_ioctl_ino_lookup(root, argp); 4585d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4586d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4587d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4588d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 4589d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 4590d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 45911406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 45922ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 45939b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 45949b199859SFilipe David Borba Manana int ret; 45959b199859SFilipe David Borba Manana 45969db4dc24SNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 45979b199859SFilipe David Borba Manana if (ret) 45989b199859SFilipe David Borba Manana return ret; 45990b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 46002fad4e83SDavid Sterba /* 46012fad4e83SDavid Sterba * The transaction thread may want to do more work, 460201327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 46032fad4e83SDavid Sterba * processing uncleaned subvols. 46042fad4e83SDavid Sterba */ 46050b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 46069b199859SFilipe David Borba Manana return ret; 46079b199859SFilipe David Borba Manana } 460846204592SSage Weil case BTRFS_IOC_START_SYNC: 46099a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 461046204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 46112ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 4612475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4613b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4614475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 46152ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 4616475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 46172ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 4618c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 46199ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4620837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 46212ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 462219a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 46232ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 46248ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 46258ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 4626abccd00fSHugo Mills #ifdef CONFIG_64BIT 4627abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 4628abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 4629abccd00fSHugo Mills #endif 463031db9f7cSAlexander Block case BTRFS_IOC_SEND: 46319ad12305SSahil Kang return _btrfs_ioctl_send(inode, argp, false); 46322351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 46332351f431SJosef Bacik case BTRFS_IOC_SEND_32: 46349ad12305SSahil Kang return _btrfs_ioctl_send(inode, argp, true); 46352351f431SJosef Bacik #endif 4636c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 46372ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 46385d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4639905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 46405d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4641905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 46425d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4643905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 46445d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4645905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 46462f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 46472f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 46482f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 4649b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 465057254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 4651b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 46523f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 46532ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 46542eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 4655d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 46562eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 4657b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 46582eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 46592eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 4660b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 46619ad12305SSahil Kang return btrfs_ioctl_get_subvol_info(inode, argp); 466242e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 4663dc408ccdSSahil Kang return btrfs_ioctl_get_subvol_rootref(root, argp); 466423d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 466523d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 466614605409SBoris Burkov case FS_IOC_ENABLE_VERITY: 466714605409SBoris Burkov return fsverity_ioctl_enable(file, (const void __user *)argp); 466814605409SBoris Burkov case FS_IOC_MEASURE_VERITY: 466914605409SBoris Burkov return fsverity_ioctl_measure(file, argp); 46701881fba8SOmar Sandoval case BTRFS_IOC_ENCODED_READ: 46711881fba8SOmar Sandoval return btrfs_ioctl_encoded_read(file, argp, false); 46727c0c7269SOmar Sandoval case BTRFS_IOC_ENCODED_WRITE: 46737c0c7269SOmar Sandoval return btrfs_ioctl_encoded_write(file, argp, false); 46741881fba8SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 46751881fba8SOmar Sandoval case BTRFS_IOC_ENCODED_READ_32: 46761881fba8SOmar Sandoval return btrfs_ioctl_encoded_read(file, argp, true); 46777c0c7269SOmar Sandoval case BTRFS_IOC_ENCODED_WRITE_32: 46787c0c7269SOmar Sandoval return btrfs_ioctl_encoded_write(file, argp, true); 46791881fba8SOmar Sandoval #endif 4680f46b5a66SChristoph Hellwig } 4681f46b5a66SChristoph Hellwig 4682f46b5a66SChristoph Hellwig return -ENOTTY; 4683f46b5a66SChristoph Hellwig } 46844c63c245SLuke Dashjr 46854c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 46864c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 46874c63c245SLuke Dashjr { 46882a362249SJeff Mahoney /* 46892a362249SJeff Mahoney * These all access 32-bit values anyway so no further 46902a362249SJeff Mahoney * handling is necessary. 46912a362249SJeff Mahoney */ 46924c63c245SLuke Dashjr switch (cmd) { 46934c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 46944c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 46954c63c245SLuke Dashjr break; 46964c63c245SLuke Dashjr } 46974c63c245SLuke Dashjr 46984c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 46994c63c245SLuke Dashjr } 47004c63c245SLuke Dashjr #endif 4701