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> 31f46b5a66SChristoph Hellwig #include "ctree.h" 32f46b5a66SChristoph Hellwig #include "disk-io.h" 33949964c9SMarcos Paulo de Souza #include "export.h" 34f46b5a66SChristoph Hellwig #include "transaction.h" 35f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 36f46b5a66SChristoph Hellwig #include "print-tree.h" 37f46b5a66SChristoph Hellwig #include "volumes.h" 38925baeddSChris Mason #include "locking.h" 39d7728c96SJan Schmidt #include "backref.h" 40606686eeSJosef Bacik #include "rcu-string.h" 4131db9f7cSAlexander Block #include "send.h" 423f6bcfbdSStefan Behrens #include "dev-replace.h" 4363541927SFilipe David Borba Manana #include "props.h" 443b02a68aSJeff Mahoney #include "sysfs.h" 45fcebe456SJosef Bacik #include "qgroup.h" 461ec9a1aeSFilipe Manana #include "tree-log.h" 47ebb8765bSAnand Jain #include "compression.h" 488719aaaeSJosef Bacik #include "space-info.h" 4986736342SJosef Bacik #include "delalloc-space.h" 50aac0023cSJosef Bacik #include "block-group.h" 5122b398eeSQu Wenruo #include "subpage.h" 52f46b5a66SChristoph Hellwig 53abccd00fSHugo Mills #ifdef CONFIG_64BIT 54abccd00fSHugo Mills /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI 55abccd00fSHugo Mills * structures are incorrect, as the timespec structure from userspace 56abccd00fSHugo Mills * is 4 bytes too small. We define these alternatives here to teach 57abccd00fSHugo Mills * the kernel about the 32-bit struct packing. 58abccd00fSHugo Mills */ 59abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 { 60abccd00fSHugo Mills __u64 sec; 61abccd00fSHugo Mills __u32 nsec; 62abccd00fSHugo Mills } __attribute__ ((__packed__)); 63abccd00fSHugo Mills 64abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 { 65abccd00fSHugo Mills char uuid[BTRFS_UUID_SIZE]; /* in */ 66abccd00fSHugo Mills __u64 stransid; /* in */ 67abccd00fSHugo Mills __u64 rtransid; /* out */ 68abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 stime; /* in */ 69abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 rtime; /* out */ 70abccd00fSHugo Mills __u64 flags; /* in */ 71abccd00fSHugo Mills __u64 reserved[16]; /* in */ 72abccd00fSHugo Mills } __attribute__ ((__packed__)); 73abccd00fSHugo Mills 74abccd00fSHugo Mills #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ 75abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32) 76abccd00fSHugo Mills #endif 77abccd00fSHugo Mills 782351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 792351f431SJosef Bacik struct btrfs_ioctl_send_args_32 { 802351f431SJosef Bacik __s64 send_fd; /* in */ 812351f431SJosef Bacik __u64 clone_sources_count; /* in */ 822351f431SJosef Bacik compat_uptr_t clone_sources; /* in */ 832351f431SJosef Bacik __u64 parent_root; /* in */ 842351f431SJosef Bacik __u64 flags; /* in */ 85e77fbf99SDavid Sterba __u32 version; /* in */ 86e77fbf99SDavid Sterba __u8 reserved[28]; /* in */ 872351f431SJosef Bacik } __attribute__ ((__packed__)); 882351f431SJosef Bacik 892351f431SJosef Bacik #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \ 902351f431SJosef Bacik struct btrfs_ioctl_send_args_32) 912351f431SJosef Bacik #endif 92abccd00fSHugo Mills 936cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 941905a0f7SDavid Sterba static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode, 951905a0f7SDavid Sterba unsigned int flags) 966cbff00fSChristoph Hellwig { 971905a0f7SDavid Sterba if (S_ISDIR(inode->i_mode)) 986cbff00fSChristoph Hellwig return flags; 991905a0f7SDavid Sterba else if (S_ISREG(inode->i_mode)) 1006cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 1016cbff00fSChristoph Hellwig else 1026cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 1036cbff00fSChristoph Hellwig } 104f46b5a66SChristoph Hellwig 1056cbff00fSChristoph Hellwig /* 106a157d4fdSDavid Sterba * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS 107a157d4fdSDavid Sterba * ioctl. 1086cbff00fSChristoph Hellwig */ 10977eea05eSBoris Burkov static unsigned int btrfs_inode_flags_to_fsflags(struct btrfs_inode *binode) 1106cbff00fSChristoph Hellwig { 1116cbff00fSChristoph Hellwig unsigned int iflags = 0; 11277eea05eSBoris Burkov u32 flags = binode->flags; 11314605409SBoris Burkov u32 ro_flags = binode->ro_flags; 1146cbff00fSChristoph Hellwig 1156cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 1166cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 1176cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 1186cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 1196cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 1206cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 1216cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 1226cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 1236cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 1246cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 1256cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 1266cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 127d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 128d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 12914605409SBoris Burkov if (ro_flags & BTRFS_INODE_RO_VERITY) 13014605409SBoris Burkov iflags |= FS_VERITY_FL; 131d0092bddSLi Zefan 13213f48dc9SSatoru Takeuchi if (flags & BTRFS_INODE_NOCOMPRESS) 133d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 13413f48dc9SSatoru Takeuchi else if (flags & BTRFS_INODE_COMPRESS) 13513f48dc9SSatoru Takeuchi iflags |= FS_COMPR_FL; 1366cbff00fSChristoph Hellwig 1376cbff00fSChristoph Hellwig return iflags; 1386cbff00fSChristoph Hellwig } 1396cbff00fSChristoph Hellwig 1406cbff00fSChristoph Hellwig /* 1416cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1426cbff00fSChristoph Hellwig */ 1437b6a221eSDavid Sterba void btrfs_sync_inode_flags_to_i_flags(struct inode *inode) 1446cbff00fSChristoph Hellwig { 1455c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 1463cc79392SFilipe Manana unsigned int new_fl = 0; 1476cbff00fSChristoph Hellwig 1485c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_SYNC) 1493cc79392SFilipe Manana new_fl |= S_SYNC; 1505c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_IMMUTABLE) 1513cc79392SFilipe Manana new_fl |= S_IMMUTABLE; 1525c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_APPEND) 1533cc79392SFilipe Manana new_fl |= S_APPEND; 1545c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_NOATIME) 1553cc79392SFilipe Manana new_fl |= S_NOATIME; 1565c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_DIRSYNC) 1573cc79392SFilipe Manana new_fl |= S_DIRSYNC; 15814605409SBoris Burkov if (binode->ro_flags & BTRFS_INODE_RO_VERITY) 15914605409SBoris Burkov new_fl |= S_VERITY; 1603cc79392SFilipe Manana 1613cc79392SFilipe Manana set_mask_bits(&inode->i_flags, 16214605409SBoris Burkov S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC | 16314605409SBoris Burkov S_VERITY, new_fl); 1646cbff00fSChristoph Hellwig } 1656cbff00fSChristoph Hellwig 166f37c563bSDavid Sterba /* 167f37c563bSDavid Sterba * Check if @flags are a supported and valid set of FS_*_FL flags and that 168f37c563bSDavid Sterba * the old and new flags are not conflicting 169f37c563bSDavid Sterba */ 170f37c563bSDavid Sterba static int check_fsflags(unsigned int old_flags, unsigned int flags) 17175e7cb7fSLiu Bo { 17275e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 17375e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 17475e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 175e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 176e1e8fb6aSLi Zefan FS_NOCOW_FL)) 17775e7cb7fSLiu Bo return -EOPNOTSUPP; 17875e7cb7fSLiu Bo 179f37c563bSDavid Sterba /* COMPR and NOCOMP on new/old are valid */ 18075e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 18175e7cb7fSLiu Bo return -EINVAL; 18275e7cb7fSLiu Bo 183f37c563bSDavid Sterba if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL)) 184f37c563bSDavid Sterba return -EINVAL; 185f37c563bSDavid Sterba 186f37c563bSDavid Sterba /* NOCOW and compression options are mutually exclusive */ 187f37c563bSDavid Sterba if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 188f37c563bSDavid Sterba return -EINVAL; 189f37c563bSDavid Sterba if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 190f37c563bSDavid Sterba return -EINVAL; 191f37c563bSDavid Sterba 19275e7cb7fSLiu Bo return 0; 19375e7cb7fSLiu Bo } 19475e7cb7fSLiu Bo 195d206e9c9SNaohiro Aota static int check_fsflags_compatible(struct btrfs_fs_info *fs_info, 196d206e9c9SNaohiro Aota unsigned int flags) 197d206e9c9SNaohiro Aota { 198d206e9c9SNaohiro Aota if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL)) 199d206e9c9SNaohiro Aota return -EPERM; 200d206e9c9SNaohiro Aota 201d206e9c9SNaohiro Aota return 0; 202d206e9c9SNaohiro Aota } 203d206e9c9SNaohiro Aota 20497fc2977SMiklos Szeredi /* 20597fc2977SMiklos Szeredi * Set flags/xflags from the internal inode flags. The remaining items of 20697fc2977SMiklos Szeredi * fsxattr are zeroed. 20797fc2977SMiklos Szeredi */ 20897fc2977SMiklos Szeredi int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa) 2096cbff00fSChristoph Hellwig { 21097fc2977SMiklos Szeredi struct btrfs_inode *binode = BTRFS_I(d_inode(dentry)); 21197fc2977SMiklos Szeredi 21277eea05eSBoris Burkov fileattr_fill_flags(fa, btrfs_inode_flags_to_fsflags(binode)); 21397fc2977SMiklos Szeredi return 0; 21497fc2977SMiklos Szeredi } 21597fc2977SMiklos Szeredi 21697fc2977SMiklos Szeredi int btrfs_fileattr_set(struct user_namespace *mnt_userns, 21797fc2977SMiklos Szeredi struct dentry *dentry, struct fileattr *fa) 21897fc2977SMiklos Szeredi { 21997fc2977SMiklos Szeredi struct inode *inode = d_inode(dentry); 2200b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 2215c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 2225c57b8b6SDavid Sterba struct btrfs_root *root = binode->root; 2236cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 2245aca2842SDarrick J. Wong unsigned int fsflags, old_fsflags; 2256cbff00fSChristoph Hellwig int ret; 226ff9fef55SAnand Jain const char *comp = NULL; 227f37c563bSDavid Sterba u32 binode_flags; 2286cbff00fSChristoph Hellwig 229b83cc969SLi Zefan if (btrfs_root_readonly(root)) 230b83cc969SLi Zefan return -EROFS; 231b83cc969SLi Zefan 23297fc2977SMiklos Szeredi if (fileattr_has_fsx(fa)) 23397fc2977SMiklos Szeredi return -EOPNOTSUPP; 2346cbff00fSChristoph Hellwig 23597fc2977SMiklos Szeredi fsflags = btrfs_mask_fsflags_for_type(inode, fa->flags); 23677eea05eSBoris Burkov old_fsflags = btrfs_inode_flags_to_fsflags(binode); 23797fc2977SMiklos Szeredi ret = check_fsflags(old_fsflags, fsflags); 238e7848683SJan Kara if (ret) 239e7848683SJan Kara return ret; 240e7848683SJan Kara 241d206e9c9SNaohiro Aota ret = check_fsflags_compatible(fs_info, fsflags); 242d206e9c9SNaohiro Aota if (ret) 24397fc2977SMiklos Szeredi return ret; 244d206e9c9SNaohiro Aota 245f37c563bSDavid Sterba binode_flags = binode->flags; 2465c57b8b6SDavid Sterba if (fsflags & FS_SYNC_FL) 247d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_SYNC; 2486cbff00fSChristoph Hellwig else 249d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_SYNC; 2505c57b8b6SDavid Sterba if (fsflags & FS_IMMUTABLE_FL) 251d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_IMMUTABLE; 2526cbff00fSChristoph Hellwig else 253d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_IMMUTABLE; 2545c57b8b6SDavid Sterba if (fsflags & FS_APPEND_FL) 255d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_APPEND; 2566cbff00fSChristoph Hellwig else 257d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_APPEND; 2585c57b8b6SDavid Sterba if (fsflags & FS_NODUMP_FL) 259d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODUMP; 2606cbff00fSChristoph Hellwig else 261d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODUMP; 2625c57b8b6SDavid Sterba if (fsflags & FS_NOATIME_FL) 263d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOATIME; 2646cbff00fSChristoph Hellwig else 265d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOATIME; 26697fc2977SMiklos Szeredi 26797fc2977SMiklos Szeredi /* If coming from FS_IOC_FSSETXATTR then skip unconverted flags */ 26897fc2977SMiklos Szeredi if (!fa->flags_valid) { 26997fc2977SMiklos Szeredi /* 1 item for the inode */ 27097fc2977SMiklos Szeredi trans = btrfs_start_transaction(root, 1); 2719b8a233bSRitesh Harjani if (IS_ERR(trans)) 2729b8a233bSRitesh Harjani return PTR_ERR(trans); 27397fc2977SMiklos Szeredi goto update_flags; 27497fc2977SMiklos Szeredi } 27597fc2977SMiklos Szeredi 2765c57b8b6SDavid Sterba if (fsflags & FS_DIRSYNC_FL) 277d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_DIRSYNC; 2786cbff00fSChristoph Hellwig else 279d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_DIRSYNC; 2805c57b8b6SDavid Sterba if (fsflags & FS_NOCOW_FL) { 28144e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 2827e97b8daSDavid Sterba /* 2837e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2847e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2857e97b8daSDavid Sterba * status of the file and will not set it. 2867e97b8daSDavid Sterba */ 2877e97b8daSDavid Sterba if (inode->i_size == 0) 288d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW | 289d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM; 2907e97b8daSDavid Sterba } else { 291d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW; 2927e97b8daSDavid Sterba } 2937e97b8daSDavid Sterba } else { 2947e97b8daSDavid Sterba /* 29501327610SNicholas D Steeves * Revert back under same assumptions as above 2967e97b8daSDavid Sterba */ 29744e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 2987e97b8daSDavid Sterba if (inode->i_size == 0) 299d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_NODATACOW | 300d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM); 3017e97b8daSDavid Sterba } else { 302d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODATACOW; 3037e97b8daSDavid Sterba } 3047e97b8daSDavid Sterba } 3056cbff00fSChristoph Hellwig 30675e7cb7fSLiu Bo /* 30775e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 30875e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 30975e7cb7fSLiu Bo * things smaller. 31075e7cb7fSLiu Bo */ 3115c57b8b6SDavid Sterba if (fsflags & FS_NOCOMP_FL) { 312d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_COMPRESS; 313d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOCOMPRESS; 3145c57b8b6SDavid Sterba } else if (fsflags & FS_COMPR_FL) { 31563541927SFilipe David Borba Manana 31697fc2977SMiklos Szeredi if (IS_SWAPFILE(inode)) 31797fc2977SMiklos Szeredi return -ETXTBSY; 318eede2bf3SOmar Sandoval 319d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_COMPRESS; 320d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOCOMPRESS; 32163541927SFilipe David Borba Manana 32293370509SDavid Sterba comp = btrfs_compress_type2str(fs_info->compress_type); 32393370509SDavid Sterba if (!comp || comp[0] == 0) 32493370509SDavid Sterba comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB); 325ebcb904dSLi Zefan } else { 326d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 32775e7cb7fSLiu Bo } 3286cbff00fSChristoph Hellwig 329ff9fef55SAnand Jain /* 330ff9fef55SAnand Jain * 1 for inode item 331ff9fef55SAnand Jain * 2 for properties 332ff9fef55SAnand Jain */ 333ff9fef55SAnand Jain trans = btrfs_start_transaction(root, 3); 33497fc2977SMiklos Szeredi if (IS_ERR(trans)) 33597fc2977SMiklos Szeredi return PTR_ERR(trans); 3366cbff00fSChristoph Hellwig 337ff9fef55SAnand Jain if (comp) { 338ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp, 339ff9fef55SAnand Jain strlen(comp), 0); 340ff9fef55SAnand Jain if (ret) { 341ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 342ff9fef55SAnand Jain goto out_end_trans; 343ff9fef55SAnand Jain } 344ff9fef55SAnand Jain } else { 345ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL, 346ff9fef55SAnand Jain 0, 0); 347ff9fef55SAnand Jain if (ret && ret != -ENODATA) { 348ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 349ff9fef55SAnand Jain goto out_end_trans; 350ff9fef55SAnand Jain } 351ff9fef55SAnand Jain } 352ff9fef55SAnand Jain 35397fc2977SMiklos Szeredi update_flags: 354d2b8fcfeSAnand Jain binode->flags = binode_flags; 3557b6a221eSDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 3560c4d2d95SJosef Bacik inode_inc_iversion(inode); 357c2050a45SDeepa Dinamani inode->i_ctime = current_time(inode); 3589a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); 3596cbff00fSChristoph Hellwig 360ff9fef55SAnand Jain out_end_trans: 3613a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3622d4e6f6aSliubo return ret; 3636cbff00fSChristoph Hellwig } 3646cbff00fSChristoph Hellwig 3650d7ed32cSDavid Sterba /* 3660d7ed32cSDavid Sterba * Start exclusive operation @type, return true on success 3670d7ed32cSDavid Sterba */ 368c3e1f96cSGoldwyn Rodrigues bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, 369c3e1f96cSGoldwyn Rodrigues enum btrfs_exclusive_operation type) 370c3e1f96cSGoldwyn Rodrigues { 3710d7ed32cSDavid Sterba bool ret = false; 3720d7ed32cSDavid Sterba 3730d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 3740d7ed32cSDavid Sterba if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) { 3750d7ed32cSDavid Sterba fs_info->exclusive_operation = type; 3760d7ed32cSDavid Sterba ret = true; 3770d7ed32cSDavid Sterba } 3780d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 3790d7ed32cSDavid Sterba 3800d7ed32cSDavid Sterba return ret; 381c3e1f96cSGoldwyn Rodrigues } 382c3e1f96cSGoldwyn Rodrigues 383578bda9eSDavid Sterba /* 384578bda9eSDavid Sterba * Conditionally allow to enter the exclusive operation in case it's compatible 385578bda9eSDavid Sterba * with the running one. This must be paired with btrfs_exclop_start_unlock and 386578bda9eSDavid Sterba * btrfs_exclop_finish. 387578bda9eSDavid Sterba * 388578bda9eSDavid Sterba * Compatibility: 389578bda9eSDavid Sterba * - the same type is already running 390621a1ee1SNikolay Borisov * - when trying to add a device and balance has been paused 391578bda9eSDavid Sterba * - not BTRFS_EXCLOP_NONE - this is intentionally incompatible and the caller 392578bda9eSDavid Sterba * must check the condition first that would allow none -> @type 393578bda9eSDavid Sterba */ 394578bda9eSDavid Sterba bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info, 395578bda9eSDavid Sterba enum btrfs_exclusive_operation type) 396578bda9eSDavid Sterba { 397578bda9eSDavid Sterba spin_lock(&fs_info->super_lock); 398621a1ee1SNikolay Borisov if (fs_info->exclusive_operation == type || 399621a1ee1SNikolay Borisov (fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED && 400621a1ee1SNikolay Borisov type == BTRFS_EXCLOP_DEV_ADD)) 401578bda9eSDavid Sterba return true; 402578bda9eSDavid Sterba 403578bda9eSDavid Sterba spin_unlock(&fs_info->super_lock); 404578bda9eSDavid Sterba return false; 405578bda9eSDavid Sterba } 406578bda9eSDavid Sterba 407578bda9eSDavid Sterba void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info) 408578bda9eSDavid Sterba { 409578bda9eSDavid Sterba spin_unlock(&fs_info->super_lock); 410578bda9eSDavid Sterba } 411578bda9eSDavid Sterba 412c3e1f96cSGoldwyn Rodrigues void btrfs_exclop_finish(struct btrfs_fs_info *fs_info) 413c3e1f96cSGoldwyn Rodrigues { 4140d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 415c3e1f96cSGoldwyn Rodrigues WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE); 4160d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 41766a2823cSGoldwyn Rodrigues sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation"); 418c3e1f96cSGoldwyn Rodrigues } 419c3e1f96cSGoldwyn Rodrigues 420efc0e69cSNikolay Borisov void btrfs_exclop_balance(struct btrfs_fs_info *fs_info, 421efc0e69cSNikolay Borisov enum btrfs_exclusive_operation op) 422efc0e69cSNikolay Borisov { 423efc0e69cSNikolay Borisov switch (op) { 424efc0e69cSNikolay Borisov case BTRFS_EXCLOP_BALANCE_PAUSED: 425efc0e69cSNikolay Borisov spin_lock(&fs_info->super_lock); 426efc0e69cSNikolay Borisov ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE || 427efc0e69cSNikolay Borisov fs_info->exclusive_operation == BTRFS_EXCLOP_DEV_ADD); 428efc0e69cSNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE_PAUSED; 429efc0e69cSNikolay Borisov spin_unlock(&fs_info->super_lock); 430efc0e69cSNikolay Borisov break; 431efc0e69cSNikolay Borisov case BTRFS_EXCLOP_BALANCE: 432efc0e69cSNikolay Borisov spin_lock(&fs_info->super_lock); 433efc0e69cSNikolay Borisov ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED); 434efc0e69cSNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE; 435efc0e69cSNikolay Borisov spin_unlock(&fs_info->super_lock); 436efc0e69cSNikolay Borisov break; 437efc0e69cSNikolay Borisov default: 438efc0e69cSNikolay Borisov btrfs_warn(fs_info, 439efc0e69cSNikolay Borisov "invalid exclop balance operation %d requested", op); 440efc0e69cSNikolay Borisov } 441efc0e69cSNikolay Borisov } 442efc0e69cSNikolay Borisov 4436cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 4446cbff00fSChristoph Hellwig { 445496ad9aaSAl Viro struct inode *inode = file_inode(file); 4466cbff00fSChristoph Hellwig 4476cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 4486cbff00fSChristoph Hellwig } 449f46b5a66SChristoph Hellwig 450b929c1d8SMarcos Paulo de Souza static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, 451b929c1d8SMarcos Paulo de Souza void __user *arg) 452f7039b1dSLi Dongyang { 453f7039b1dSLi Dongyang struct btrfs_device *device; 454f7039b1dSLi Dongyang struct request_queue *q; 455f7039b1dSLi Dongyang struct fstrim_range range; 456f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 457f7039b1dSLi Dongyang u64 num_devices = 0; 458f7039b1dSLi Dongyang int ret; 459f7039b1dSLi Dongyang 460f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 461f7039b1dSLi Dongyang return -EPERM; 462f7039b1dSLi Dongyang 463f35f06c3SFilipe Manana /* 4641cb3dc3fSNaohiro Aota * btrfs_trim_block_group() depends on space cache, which is not 4651cb3dc3fSNaohiro Aota * available in zoned filesystem. So, disallow fitrim on a zoned 4661cb3dc3fSNaohiro Aota * filesystem for now. 4671cb3dc3fSNaohiro Aota */ 4681cb3dc3fSNaohiro Aota if (btrfs_is_zoned(fs_info)) 4691cb3dc3fSNaohiro Aota return -EOPNOTSUPP; 4701cb3dc3fSNaohiro Aota 4711cb3dc3fSNaohiro Aota /* 472f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 473f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 474f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 475f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 476f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 477f35f06c3SFilipe Manana */ 478f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 479f35f06c3SFilipe Manana return -EROFS; 480f35f06c3SFilipe Manana 4811f78160cSXiao Guangrong rcu_read_lock(); 4821f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 4831f78160cSXiao Guangrong dev_list) { 484f7039b1dSLi Dongyang if (!device->bdev) 485f7039b1dSLi Dongyang continue; 486f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 487f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 488f7039b1dSLi Dongyang num_devices++; 48950d0446eSSeraphime Kirkovski minlen = min_t(u64, q->limits.discard_granularity, 490f7039b1dSLi Dongyang minlen); 491f7039b1dSLi Dongyang } 492f7039b1dSLi Dongyang } 4931f78160cSXiao Guangrong rcu_read_unlock(); 494f4c697e6SLukas Czerner 495f7039b1dSLi Dongyang if (!num_devices) 496f7039b1dSLi Dongyang return -EOPNOTSUPP; 497f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 498f7039b1dSLi Dongyang return -EFAULT; 4996ba9fc8eSQu Wenruo 5006ba9fc8eSQu Wenruo /* 5016ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 5026ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 5036ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 5046ba9fc8eSQu Wenruo */ 5056ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 506f4c697e6SLukas Czerner return -EINVAL; 507f7039b1dSLi Dongyang 508f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 5092ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 510f7039b1dSLi Dongyang if (ret < 0) 511f7039b1dSLi Dongyang return ret; 512f7039b1dSLi Dongyang 513f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 514f7039b1dSLi Dongyang return -EFAULT; 515f7039b1dSLi Dongyang 516f7039b1dSLi Dongyang return 0; 517f7039b1dSLi Dongyang } 518f7039b1dSLi Dongyang 519e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 520dd5f9615SStefan Behrens { 52146e0f66aSChris Mason int i; 52246e0f66aSChris Mason 52346e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 52446e0f66aSChris Mason if (uuid[i]) 52546e0f66aSChris Mason return 0; 52646e0f66aSChris Mason } 52746e0f66aSChris Mason return 1; 528dd5f9615SStefan Behrens } 529dd5f9615SStefan Behrens 5304d4340c9SChristian Brauner static noinline int create_subvol(struct user_namespace *mnt_userns, 5314d4340c9SChristian Brauner struct inode *dir, struct dentry *dentry, 53252f75f4fSDavid Sterba const char *name, int namelen, 5338696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 534f46b5a66SChristoph Hellwig { 5350b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 536f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 537f46b5a66SChristoph Hellwig struct btrfs_key key; 53849a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 539f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 540f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 541d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 54276dda93cSYan, Zheng struct btrfs_root *new_root; 543d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 54495582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 5455662344bSTsutomu Itoh struct inode *inode; 546f46b5a66SChristoph Hellwig int ret; 5472dfb1e43SQu Wenruo dev_t anon_dev = 0; 548f46b5a66SChristoph Hellwig u64 objectid; 5493de4586cSChris Mason u64 index = 0; 550f46b5a66SChristoph Hellwig 55149a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 55249a3c4d9SDavid Sterba if (!root_item) 55349a3c4d9SDavid Sterba return -ENOMEM; 55449a3c4d9SDavid Sterba 555543068a2SNikolay Borisov ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); 5562fbe8c8aSAl Viro if (ret) 55749a3c4d9SDavid Sterba goto fail_free; 5586a912213SJosef Bacik 5592dfb1e43SQu Wenruo ret = get_anon_bdev(&anon_dev); 5602dfb1e43SQu Wenruo if (ret < 0) 5612dfb1e43SQu Wenruo goto fail_free; 5622dfb1e43SQu Wenruo 563e09fe2d2SQu Wenruo /* 564e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 56501327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 566e09fe2d2SQu Wenruo */ 56749a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 56849a3c4d9SDavid Sterba ret = -ENOSPC; 56949a3c4d9SDavid Sterba goto fail_free; 57049a3c4d9SDavid Sterba } 571e09fe2d2SQu Wenruo 572d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 5739ed74f2dSJosef Bacik /* 574d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 575d5c12070SMiao Xie * of create_snapshot(). 5769ed74f2dSJosef Bacik */ 577c4c129dbSGu JinXiang ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false); 578d5c12070SMiao Xie if (ret) 57949a3c4d9SDavid Sterba goto fail_free; 580f46b5a66SChristoph Hellwig 581d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 582d5c12070SMiao Xie if (IS_ERR(trans)) { 583d5c12070SMiao Xie ret = PTR_ERR(trans); 584e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 58549a3c4d9SDavid Sterba goto fail_free; 586d5c12070SMiao Xie } 587d5c12070SMiao Xie trans->block_rsv = &block_rsv; 588d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 589f46b5a66SChristoph Hellwig 590a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 5916f72c7e2SArne Jansen if (ret) 5926f72c7e2SArne Jansen goto fail; 5936f72c7e2SArne Jansen 5949631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 5959631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 5968e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 5978e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 5988e8a1e31SJosef Bacik goto fail; 5998e8a1e31SJosef Bacik } 600f46b5a66SChristoph Hellwig 601f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 602f46b5a66SChristoph Hellwig 60349a3c4d9SDavid Sterba inode_item = &root_item->inode; 6043cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6053cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6063cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 607da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6080b246afaSJeff Mahoney fs_info->nodesize); 6093cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 610f46b5a66SChristoph Hellwig 61149a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 61249a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6133cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 61408fe4db1SLi Zefan 61549a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 61649a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 61749a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 61849a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 61949a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 62049a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 621f46b5a66SChristoph Hellwig 62249a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 62349a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 624807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 62549a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 62649a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 62749a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 62849a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 62949a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 630f46b5a66SChristoph Hellwig 631925baeddSChris Mason btrfs_tree_unlock(leaf); 632f46b5a66SChristoph Hellwig 63369948022SNikolay Borisov btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); 634f46b5a66SChristoph Hellwig 635f46b5a66SChristoph Hellwig key.objectid = objectid; 6365d4f98a2SYan Zheng key.offset = 0; 637962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 6380b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 63949a3c4d9SDavid Sterba root_item); 64067addf29SFilipe Manana if (ret) { 64167addf29SFilipe Manana /* 64267addf29SFilipe Manana * Since we don't abort the transaction in this case, free the 64367addf29SFilipe Manana * tree block so that we don't leak space and leave the 64467addf29SFilipe Manana * filesystem in an inconsistent state (an extent item in the 6457a163608SFilipe Manana * extent tree with a backreference for a root that does not 646212a58fdSFilipe Manana * exists). 64767addf29SFilipe Manana */ 648212a58fdSFilipe Manana btrfs_tree_lock(leaf); 649212a58fdSFilipe Manana btrfs_clean_tree_block(leaf); 650212a58fdSFilipe Manana btrfs_tree_unlock(leaf); 6517a163608SFilipe Manana btrfs_free_tree_block(trans, objectid, leaf, 0, 1); 65267addf29SFilipe Manana free_extent_buffer(leaf); 653f46b5a66SChristoph Hellwig goto fail; 65467addf29SFilipe Manana } 65567addf29SFilipe Manana 65667addf29SFilipe Manana free_extent_buffer(leaf); 65767addf29SFilipe Manana leaf = NULL; 658f46b5a66SChristoph Hellwig 65976dda93cSYan, Zheng key.offset = (u64)-1; 6602dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 66179787eaaSJeff Mahoney if (IS_ERR(new_root)) { 6622dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 66379787eaaSJeff Mahoney ret = PTR_ERR(new_root); 66466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 66579787eaaSJeff Mahoney goto fail; 66679787eaaSJeff Mahoney } 6672dfb1e43SQu Wenruo /* Freeing will be done in btrfs_put_root() of new_root */ 6682dfb1e43SQu Wenruo anon_dev = 0; 66976dda93cSYan, Zheng 670221581e4SJosef Bacik ret = btrfs_record_root_in_trans(trans, new_root); 671221581e4SJosef Bacik if (ret) { 672221581e4SJosef Bacik btrfs_put_root(new_root); 673221581e4SJosef Bacik btrfs_abort_transaction(trans, ret); 674221581e4SJosef Bacik goto fail; 675221581e4SJosef Bacik } 67676dda93cSYan, Zheng 6774d4340c9SChristian Brauner ret = btrfs_create_subvol_root(trans, new_root, root, mnt_userns); 67800246528SJosef Bacik btrfs_put_root(new_root); 679ce598979SMark Fasheh if (ret) { 680ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 68166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 682ce598979SMark Fasheh goto fail; 683ce598979SMark Fasheh } 684ce598979SMark Fasheh 685f46b5a66SChristoph Hellwig /* 686f46b5a66SChristoph Hellwig * insert the directory item 687f46b5a66SChristoph Hellwig */ 688877574e2SNikolay Borisov ret = btrfs_set_inode_index(BTRFS_I(dir), &index); 68979787eaaSJeff Mahoney if (ret) { 69066642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 69179787eaaSJeff Mahoney goto fail; 69279787eaaSJeff Mahoney } 6933de4586cSChris Mason 694684572dfSLu Fengqi ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key, 6953de4586cSChris Mason BTRFS_FT_DIR, index); 69679787eaaSJeff Mahoney if (ret) { 69766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 698f46b5a66SChristoph Hellwig goto fail; 69979787eaaSJeff Mahoney } 7000660b5afSChris Mason 7016ef06d27SNikolay Borisov btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); 7029a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(dir)); 703c7e54b51SJosef Bacik if (ret) { 704c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 705c7e54b51SJosef Bacik goto fail; 706c7e54b51SJosef Bacik } 70752c26179SYan Zheng 7086025c19fSLu Fengqi ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid, 7094a0cc7caSNikolay Borisov btrfs_ino(BTRFS_I(dir)), index, name, namelen); 710c7e54b51SJosef Bacik if (ret) { 711c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 712c7e54b51SJosef Bacik goto fail; 713c7e54b51SJosef Bacik } 7140660b5afSChris Mason 715cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7166bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 717dd5f9615SStefan Behrens if (ret) 71866642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 719dd5f9615SStefan Behrens 720f46b5a66SChristoph Hellwig fail: 72149a3c4d9SDavid Sterba kfree(root_item); 722d5c12070SMiao Xie trans->block_rsv = NULL; 723d5c12070SMiao Xie trans->bytes_reserved = 0; 724e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 725de6e8200SLiu Bo 7261b58ae0eSFilipe Manana if (ret) 7271b58ae0eSFilipe Manana btrfs_end_transaction(trans); 7281b58ae0eSFilipe Manana else 7291b58ae0eSFilipe Manana ret = btrfs_commit_transaction(trans); 7301a65e24bSChris Mason 7315662344bSTsutomu Itoh if (!ret) { 7325662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 733de6e8200SLiu Bo if (IS_ERR(inode)) 734de6e8200SLiu Bo return PTR_ERR(inode); 7355662344bSTsutomu Itoh d_instantiate(dentry, inode); 7365662344bSTsutomu Itoh } 737f46b5a66SChristoph Hellwig return ret; 73849a3c4d9SDavid Sterba 73949a3c4d9SDavid Sterba fail_free: 7402dfb1e43SQu Wenruo if (anon_dev) 7412dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 74249a3c4d9SDavid Sterba kfree(root_item); 74349a3c4d9SDavid Sterba return ret; 744f46b5a66SChristoph Hellwig } 745f46b5a66SChristoph Hellwig 746e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7479babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 748e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 749f46b5a66SChristoph Hellwig { 7500b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7512e4bfab9SYan, Zheng struct inode *inode; 752f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 753f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7542e4bfab9SYan, Zheng int ret; 755f46b5a66SChristoph Hellwig 75692a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 757f46b5a66SChristoph Hellwig return -EINVAL; 758f46b5a66SChristoph Hellwig 759eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 760eede2bf3SOmar Sandoval btrfs_warn(fs_info, 761eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 762eede2bf3SOmar Sandoval return -ETXTBSY; 763eede2bf3SOmar Sandoval } 764eede2bf3SOmar Sandoval 76523269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 766a1ee7362SDavid Sterba if (!pending_snapshot) 767a1ee7362SDavid Sterba return -ENOMEM; 768a1ee7362SDavid Sterba 7692dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 7702dfb1e43SQu Wenruo if (ret < 0) 7712dfb1e43SQu Wenruo goto free_pending; 772b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 77323269bf5SDavid Sterba GFP_KERNEL); 7748546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 7758546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 776b0c0ea63SDavid Sterba ret = -ENOMEM; 777b0c0ea63SDavid Sterba goto free_pending; 778b0c0ea63SDavid Sterba } 779b0c0ea63SDavid Sterba 78066d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 78166d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 782d5c12070SMiao Xie /* 783d5c12070SMiao Xie * 1 - parent dir inode 784d5c12070SMiao Xie * 2 - dir entries 785d5c12070SMiao Xie * 1 - root item 786d5c12070SMiao Xie * 2 - root ref/backref 787d5c12070SMiao Xie * 1 - root of snapshot 788dd5f9615SStefan Behrens * 1 - UUID item 789d5c12070SMiao Xie */ 790d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 791dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 792ee3441b4SJeff Mahoney false); 793d5c12070SMiao Xie if (ret) 794c11fbb6eSRobbie Ko goto free_pending; 795d5c12070SMiao Xie 796a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 797a22285a6SYan, Zheng pending_snapshot->root = root; 798b83cc969SLi Zefan pending_snapshot->readonly = readonly; 799e9662f70SMiao Xie pending_snapshot->dir = dir; 8008696c533SMiao Xie pending_snapshot->inherit = inherit; 801a22285a6SYan, Zheng 802d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 803a22285a6SYan, Zheng if (IS_ERR(trans)) { 804a22285a6SYan, Zheng ret = PTR_ERR(trans); 805a22285a6SYan, Zheng goto fail; 806a22285a6SYan, Zheng } 807a22285a6SYan, Zheng 80828b21c55SFilipe Manana trans->pending_snapshot = pending_snapshot; 8099babda9fSNikolay Borisov 8103a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 811aec8030aSMiao Xie if (ret) 812c37b2b62SJosef Bacik goto fail; 813a22285a6SYan, Zheng 814a22285a6SYan, Zheng ret = pending_snapshot->error; 815f46b5a66SChristoph Hellwig if (ret) 8162e4bfab9SYan, Zheng goto fail; 817f46b5a66SChristoph Hellwig 818d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 819d3797308SChris Mason if (ret) 820d3797308SChris Mason goto fail; 821d3797308SChris Mason 8222b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8232e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8242e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8252e4bfab9SYan, Zheng goto fail; 8262e4bfab9SYan, Zheng } 8275662344bSTsutomu Itoh 8282e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8292e4bfab9SYan, Zheng ret = 0; 8302dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8312e4bfab9SYan, Zheng fail: 8322dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 8332dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8342dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 83500246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 836e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 837b0c0ea63SDavid Sterba free_pending: 8382dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8392dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 840b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8418546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 842a1ee7362SDavid Sterba kfree(pending_snapshot); 843a1ee7362SDavid Sterba 844f46b5a66SChristoph Hellwig return ret; 845f46b5a66SChristoph Hellwig } 846f46b5a66SChristoph Hellwig 8474260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8484260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8494260f7c7SSage Weil * whether the type of victim is right. 8504260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8514260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8524260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8534260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8544260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8554260f7c7SSage Weil * a. be owner of dir, or 8564260f7c7SSage Weil * b. be owner of victim, or 8574260f7c7SSage Weil * c. have CAP_FOWNER capability 85801327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 8594260f7c7SSage Weil * links pointing to it. 8604260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8614260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 8624260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 8634260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 8644260f7c7SSage Weil * nfs_async_unlink(). 8654260f7c7SSage Weil */ 8664260f7c7SSage Weil 867c4ed533bSChristian Brauner static int btrfs_may_delete(struct user_namespace *mnt_userns, 868c4ed533bSChristian Brauner struct inode *dir, struct dentry *victim, int isdir) 8694260f7c7SSage Weil { 8704260f7c7SSage Weil int error; 8714260f7c7SSage Weil 8722b0143b5SDavid Howells if (d_really_is_negative(victim)) 8734260f7c7SSage Weil return -ENOENT; 8744260f7c7SSage Weil 8752b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 8764fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 8774260f7c7SSage Weil 878c4ed533bSChristian Brauner error = inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); 8794260f7c7SSage Weil if (error) 8804260f7c7SSage Weil return error; 8814260f7c7SSage Weil if (IS_APPEND(dir)) 8824260f7c7SSage Weil return -EPERM; 883c4ed533bSChristian Brauner if (check_sticky(mnt_userns, dir, d_inode(victim)) || 884ba73d987SChristian Brauner IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) || 885ba73d987SChristian Brauner IS_SWAPFILE(d_inode(victim))) 8864260f7c7SSage Weil return -EPERM; 8874260f7c7SSage Weil if (isdir) { 888e36cb0b8SDavid Howells if (!d_is_dir(victim)) 8894260f7c7SSage Weil return -ENOTDIR; 8904260f7c7SSage Weil if (IS_ROOT(victim)) 8914260f7c7SSage Weil return -EBUSY; 892e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 8934260f7c7SSage Weil return -EISDIR; 8944260f7c7SSage Weil if (IS_DEADDIR(dir)) 8954260f7c7SSage Weil return -ENOENT; 8964260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 8974260f7c7SSage Weil return -EBUSY; 8984260f7c7SSage Weil return 0; 8994260f7c7SSage Weil } 9004260f7c7SSage Weil 901cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 9024d4340c9SChristian Brauner static inline int btrfs_may_create(struct user_namespace *mnt_userns, 9034d4340c9SChristian Brauner struct inode *dir, struct dentry *child) 904cb8e7090SChristoph Hellwig { 9052b0143b5SDavid Howells if (d_really_is_positive(child)) 906cb8e7090SChristoph Hellwig return -EEXIST; 907cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 908cb8e7090SChristoph Hellwig return -ENOENT; 9094d4340c9SChristian Brauner if (!fsuidgid_has_mapping(dir->i_sb, mnt_userns)) 9105474bf40SChristian Brauner return -EOVERFLOW; 9114d4340c9SChristian Brauner return inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); 912cb8e7090SChristoph Hellwig } 913cb8e7090SChristoph Hellwig 914cb8e7090SChristoph Hellwig /* 915cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 916cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 917cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 918cb8e7090SChristoph Hellwig */ 91992872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 9204d4340c9SChristian Brauner struct user_namespace *mnt_userns, 92152f75f4fSDavid Sterba const char *name, int namelen, 92272fd032eSSage Weil struct btrfs_root *snap_src, 9239babda9fSNikolay Borisov bool readonly, 9248696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 925cb8e7090SChristoph Hellwig { 9262b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9270b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 928cb8e7090SChristoph Hellwig struct dentry *dentry; 929cb8e7090SChristoph Hellwig int error; 930cb8e7090SChristoph Hellwig 93100235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 93200235411SAl Viro if (error == -EINTR) 93300235411SAl Viro return error; 934cb8e7090SChristoph Hellwig 9354d4340c9SChristian Brauner dentry = lookup_one(mnt_userns, name, parent->dentry, namelen); 936cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 937cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 938cb8e7090SChristoph Hellwig goto out_unlock; 939cb8e7090SChristoph Hellwig 9404d4340c9SChristian Brauner error = btrfs_may_create(mnt_userns, dir, dentry); 941cb8e7090SChristoph Hellwig if (error) 942a874a63eSLiu Bo goto out_dput; 943cb8e7090SChristoph Hellwig 9449c52057cSChris Mason /* 9459c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9469c52057cSChris Mason * check for them now when we can safely fail 9479c52057cSChris Mason */ 9489c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 9499c52057cSChris Mason dir->i_ino, name, 9509c52057cSChris Mason namelen); 9519c52057cSChris Mason if (error) 9529c52057cSChris Mason goto out_dput; 9539c52057cSChris Mason 9540b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 95576dda93cSYan, Zheng 95676dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 95776dda93cSYan, Zheng goto out_up_read; 95876dda93cSYan, Zheng 9599babda9fSNikolay Borisov if (snap_src) 9609babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 9619babda9fSNikolay Borisov else 9624d4340c9SChristian Brauner error = create_subvol(mnt_userns, dir, dentry, name, namelen, inherit); 9639babda9fSNikolay Borisov 96476dda93cSYan, Zheng if (!error) 96576dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 96676dda93cSYan, Zheng out_up_read: 9670b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 968cb8e7090SChristoph Hellwig out_dput: 969cb8e7090SChristoph Hellwig dput(dentry); 970cb8e7090SChristoph Hellwig out_unlock: 97164708539SJosef Bacik btrfs_inode_unlock(dir, 0); 972cb8e7090SChristoph Hellwig return error; 973cb8e7090SChristoph Hellwig } 974cb8e7090SChristoph Hellwig 975c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 9764d4340c9SChristian Brauner struct user_namespace *mnt_userns, 977c11fbb6eSRobbie Ko const char *name, int namelen, 978c11fbb6eSRobbie Ko struct btrfs_root *root, 979c11fbb6eSRobbie Ko bool readonly, 980c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 981c11fbb6eSRobbie Ko { 982c11fbb6eSRobbie Ko int ret; 983c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 984c11fbb6eSRobbie Ko 985c11fbb6eSRobbie Ko /* 986c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 987c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 988c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 989c11fbb6eSRobbie Ko */ 990c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 991c11fbb6eSRobbie Ko 992f9baa501SFilipe Manana ret = btrfs_start_delalloc_snapshot(root, false); 993c11fbb6eSRobbie Ko if (ret) 994c11fbb6eSRobbie Ko goto out; 995c11fbb6eSRobbie Ko 996c11fbb6eSRobbie Ko /* 997c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 998c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 999c11fbb6eSRobbie Ko * creation. 1000c11fbb6eSRobbie Ko */ 1001c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 1002c11fbb6eSRobbie Ko snapshot_force_cow = true; 1003c11fbb6eSRobbie Ko 1004c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 1005c11fbb6eSRobbie Ko 10064d4340c9SChristian Brauner ret = btrfs_mksubvol(parent, mnt_userns, name, namelen, 1007c11fbb6eSRobbie Ko root, readonly, inherit); 1008c11fbb6eSRobbie Ko out: 1009c11fbb6eSRobbie Ko if (snapshot_force_cow) 1010c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 1011c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 1012c11fbb6eSRobbie Ko return ret; 1013c11fbb6eSRobbie Ko } 1014c11fbb6eSRobbie Ko 1015e9eec721SQu Wenruo static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start, 1016e9eec721SQu Wenruo bool locked) 101717ce6ef8SLiu Bo { 101817ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1019940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 10206c282eb4SLi Zefan struct extent_map *em; 102176068caeSQu Wenruo const u32 sectorsize = BTRFS_I(inode)->root->fs_info->sectorsize; 1022940100a4SChris Mason 1023940100a4SChris Mason /* 1024940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1025940100a4SChris Mason * the full extent lock 1026940100a4SChris Mason */ 1027940100a4SChris Mason read_lock(&em_tree->lock); 102876068caeSQu Wenruo em = lookup_extent_mapping(em_tree, start, sectorsize); 1029940100a4SChris Mason read_unlock(&em_tree->lock); 1030940100a4SChris Mason 1031940100a4SChris Mason if (!em) { 1032308d9800SFilipe Manana struct extent_state *cached = NULL; 103376068caeSQu Wenruo u64 end = start + sectorsize - 1; 1034308d9800SFilipe Manana 1035940100a4SChris Mason /* get the big lock and read metadata off disk */ 1036e9eec721SQu Wenruo if (!locked) 1037ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 103876068caeSQu Wenruo em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, sectorsize); 1039e9eec721SQu Wenruo if (!locked) 1040e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1041940100a4SChris Mason 10426cf8bfbfSDan Carpenter if (IS_ERR(em)) 10436c282eb4SLi Zefan return NULL; 1044940100a4SChris Mason } 1045940100a4SChris Mason 10466c282eb4SLi Zefan return em; 10476c282eb4SLi Zefan } 10486c282eb4SLi Zefan 1049e9eec721SQu Wenruo static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em, 1050e9eec721SQu Wenruo bool locked) 10516c282eb4SLi Zefan { 10526c282eb4SLi Zefan struct extent_map *next; 10536c282eb4SLi Zefan bool ret = true; 10546c282eb4SLi Zefan 10556c282eb4SLi Zefan /* this is the last extent */ 10566c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 10576c282eb4SLi Zefan return false; 10586c282eb4SLi Zefan 1059e9eec721SQu Wenruo next = defrag_lookup_extent(inode, em->start + em->len, locked); 1060e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1061e9512d72SChris Mason ret = false; 1062e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1063ee22184bSByongho Lee (em->block_len > SZ_128K && next->block_len > SZ_128K)) 10646c282eb4SLi Zefan ret = false; 10656c282eb4SLi Zefan 10666c282eb4SLi Zefan free_extent_map(next); 10676c282eb4SLi Zefan return ret; 10686c282eb4SLi Zefan } 10696c282eb4SLi Zefan 10704cb5300bSChris Mason /* 10715767b50cSQu Wenruo * Prepare one page to be defragged. 10725767b50cSQu Wenruo * 10735767b50cSQu Wenruo * This will ensure: 10745767b50cSQu Wenruo * 10755767b50cSQu Wenruo * - Returned page is locked and has been set up properly. 10765767b50cSQu Wenruo * - No ordered extent exists in the page. 10775767b50cSQu Wenruo * - The page is uptodate. 10785767b50cSQu Wenruo * 10795767b50cSQu Wenruo * NOTE: Caller should also wait for page writeback after the cluster is 10805767b50cSQu Wenruo * prepared, here we don't do writeback wait for each page. 10815767b50cSQu Wenruo */ 10825767b50cSQu Wenruo static struct page *defrag_prepare_one_page(struct btrfs_inode *inode, 10835767b50cSQu Wenruo pgoff_t index) 1084940100a4SChris Mason { 10855767b50cSQu Wenruo struct address_space *mapping = inode->vfs_inode.i_mapping; 10865767b50cSQu Wenruo gfp_t mask = btrfs_alloc_write_mask(mapping); 10875767b50cSQu Wenruo u64 page_start = (u64)index << PAGE_SHIFT; 10885767b50cSQu Wenruo u64 page_end = page_start + PAGE_SIZE - 1; 10894cb5300bSChris Mason struct extent_state *cached_state = NULL; 10904cb5300bSChris Mason struct page *page; 10915767b50cSQu Wenruo int ret; 10925767b50cSQu Wenruo 1093600a45e1SMiao Xie again: 10945767b50cSQu Wenruo page = find_or_create_page(mapping, index, mask); 10954cb5300bSChris Mason if (!page) 10965767b50cSQu Wenruo return ERR_PTR(-ENOMEM); 10975767b50cSQu Wenruo 109824bcb454SOmar Sandoval /* 109924bcb454SOmar Sandoval * Since we can defragment files opened read-only, we can encounter 110024bcb454SOmar Sandoval * transparent huge pages here (see CONFIG_READ_ONLY_THP_FOR_FS). We 110124bcb454SOmar Sandoval * can't do I/O using huge pages yet, so return an error for now. 110224bcb454SOmar Sandoval * Filesystem transparent huge pages are typically only used for 110324bcb454SOmar Sandoval * executables that explicitly enable them, so this isn't very 110424bcb454SOmar Sandoval * restrictive. 110524bcb454SOmar Sandoval */ 110624bcb454SOmar Sandoval if (PageCompound(page)) { 110724bcb454SOmar Sandoval unlock_page(page); 110824bcb454SOmar Sandoval put_page(page); 110924bcb454SOmar Sandoval return ERR_PTR(-ETXTBSY); 111024bcb454SOmar Sandoval } 11114cb5300bSChris Mason 111232443de3SQu Wenruo ret = set_page_extent_mapped(page); 111332443de3SQu Wenruo if (ret < 0) { 111432443de3SQu Wenruo unlock_page(page); 111532443de3SQu Wenruo put_page(page); 11165767b50cSQu Wenruo return ERR_PTR(ret); 111732443de3SQu Wenruo } 111832443de3SQu Wenruo 11195767b50cSQu Wenruo /* Wait for any existing ordered extent in the range */ 1120600a45e1SMiao Xie while (1) { 11215767b50cSQu Wenruo struct btrfs_ordered_extent *ordered; 11225767b50cSQu Wenruo 11235767b50cSQu Wenruo lock_extent_bits(&inode->io_tree, page_start, page_end, &cached_state); 11245767b50cSQu Wenruo ordered = btrfs_lookup_ordered_range(inode, page_start, PAGE_SIZE); 11255767b50cSQu Wenruo unlock_extent_cached(&inode->io_tree, page_start, page_end, 1126e43bbe5eSDavid Sterba &cached_state); 1127600a45e1SMiao Xie if (!ordered) 1128600a45e1SMiao Xie break; 1129600a45e1SMiao Xie 1130600a45e1SMiao Xie unlock_page(page); 1131c0a43603SNikolay Borisov btrfs_start_ordered_extent(ordered, 1); 1132600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1133600a45e1SMiao Xie lock_page(page); 11341f12bd06SLiu Bo /* 11355767b50cSQu Wenruo * We unlocked the page above, so we need check if it was 11365767b50cSQu Wenruo * released or not. 11371f12bd06SLiu Bo */ 11385767b50cSQu Wenruo if (page->mapping != mapping || !PagePrivate(page)) { 11391f12bd06SLiu Bo unlock_page(page); 114009cbfeafSKirill A. Shutemov put_page(page); 11411f12bd06SLiu Bo goto again; 11421f12bd06SLiu Bo } 1143600a45e1SMiao Xie } 1144600a45e1SMiao Xie 11455767b50cSQu Wenruo /* 11465767b50cSQu Wenruo * Now the page range has no ordered extent any more. Read the page to 11475767b50cSQu Wenruo * make it uptodate. 11485767b50cSQu Wenruo */ 11494cb5300bSChris Mason if (!PageUptodate(page)) { 11504cb5300bSChris Mason btrfs_readpage(NULL, page); 11514cb5300bSChris Mason lock_page(page); 11525767b50cSQu Wenruo if (page->mapping != mapping || !PagePrivate(page)) { 1153600a45e1SMiao Xie unlock_page(page); 115409cbfeafSKirill A. Shutemov put_page(page); 1155600a45e1SMiao Xie goto again; 1156600a45e1SMiao Xie } 11575767b50cSQu Wenruo if (!PageUptodate(page)) { 11585767b50cSQu Wenruo unlock_page(page); 11595767b50cSQu Wenruo put_page(page); 11605767b50cSQu Wenruo return ERR_PTR(-EIO); 11614cb5300bSChris Mason } 11625767b50cSQu Wenruo } 11635767b50cSQu Wenruo return page; 11645767b50cSQu Wenruo } 11654cb5300bSChris Mason 1166eb793cf8SQu Wenruo struct defrag_target_range { 1167eb793cf8SQu Wenruo struct list_head list; 1168eb793cf8SQu Wenruo u64 start; 1169eb793cf8SQu Wenruo u64 len; 1170eb793cf8SQu Wenruo }; 11714cb5300bSChris Mason 11724cb5300bSChris Mason /* 1173eb793cf8SQu Wenruo * Collect all valid target extents. 1174eb793cf8SQu Wenruo * 1175eb793cf8SQu Wenruo * @start: file offset to lookup 1176eb793cf8SQu Wenruo * @len: length to lookup 1177eb793cf8SQu Wenruo * @extent_thresh: file extent size threshold, any extent size >= this value 1178eb793cf8SQu Wenruo * will be ignored 1179eb793cf8SQu Wenruo * @newer_than: only defrag extents newer than this value 1180eb793cf8SQu Wenruo * @do_compress: whether the defrag is doing compression 1181eb793cf8SQu Wenruo * if true, @extent_thresh will be ignored and all regular 1182eb793cf8SQu Wenruo * file extents meeting @newer_than will be targets. 1183e9eec721SQu Wenruo * @locked: if the range has already held extent lock 1184eb793cf8SQu Wenruo * @target_list: list of targets file extents 11854cb5300bSChris Mason */ 1186eb793cf8SQu Wenruo static int defrag_collect_targets(struct btrfs_inode *inode, 1187eb793cf8SQu Wenruo u64 start, u64 len, u32 extent_thresh, 1188eb793cf8SQu Wenruo u64 newer_than, bool do_compress, 1189e9eec721SQu Wenruo bool locked, struct list_head *target_list) 1190eb793cf8SQu Wenruo { 1191eb793cf8SQu Wenruo u64 cur = start; 1192eb793cf8SQu Wenruo int ret = 0; 1193eb793cf8SQu Wenruo 1194eb793cf8SQu Wenruo while (cur < start + len) { 1195eb793cf8SQu Wenruo struct extent_map *em; 1196eb793cf8SQu Wenruo struct defrag_target_range *new; 1197eb793cf8SQu Wenruo bool next_mergeable = true; 1198eb793cf8SQu Wenruo u64 range_len; 1199eb793cf8SQu Wenruo 1200e9eec721SQu Wenruo em = defrag_lookup_extent(&inode->vfs_inode, cur, locked); 1201eb793cf8SQu Wenruo if (!em) 1202eb793cf8SQu Wenruo break; 1203eb793cf8SQu Wenruo 1204eb793cf8SQu Wenruo /* Skip hole/inline/preallocated extents */ 1205eb793cf8SQu Wenruo if (em->block_start >= EXTENT_MAP_LAST_BYTE || 1206eb793cf8SQu Wenruo test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) 1207eb793cf8SQu Wenruo goto next; 1208eb793cf8SQu Wenruo 1209eb793cf8SQu Wenruo /* Skip older extent */ 1210eb793cf8SQu Wenruo if (em->generation < newer_than) 1211eb793cf8SQu Wenruo goto next; 1212eb793cf8SQu Wenruo 1213eb793cf8SQu Wenruo /* 12140cb5950fSFilipe Manana * Our start offset might be in the middle of an existing extent 12150cb5950fSFilipe Manana * map, so take that into account. 12160cb5950fSFilipe Manana */ 12170cb5950fSFilipe Manana range_len = em->len - (cur - em->start); 12180cb5950fSFilipe Manana /* 12190cb5950fSFilipe Manana * If this range of the extent map is already flagged for delalloc, 12200cb5950fSFilipe Manana * skip it, because: 12210cb5950fSFilipe Manana * 12220cb5950fSFilipe Manana * 1) We could deadlock later, when trying to reserve space for 12230cb5950fSFilipe Manana * delalloc, because in case we can't immediately reserve space 12240cb5950fSFilipe Manana * the flusher can start delalloc and wait for the respective 12250cb5950fSFilipe Manana * ordered extents to complete. The deadlock would happen 12260cb5950fSFilipe Manana * because we do the space reservation while holding the range 12270cb5950fSFilipe Manana * locked, and starting writeback, or finishing an ordered 12280cb5950fSFilipe Manana * extent, requires locking the range; 12290cb5950fSFilipe Manana * 12300cb5950fSFilipe Manana * 2) If there's delalloc there, it means there's dirty pages for 12310cb5950fSFilipe Manana * which writeback has not started yet (we clean the delalloc 12320cb5950fSFilipe Manana * flag when starting writeback and after creating an ordered 12330cb5950fSFilipe Manana * extent). If we mark pages in an adjacent range for defrag, 12340cb5950fSFilipe Manana * then we will have a larger contiguous range for delalloc, 12350cb5950fSFilipe Manana * very likely resulting in a larger extent after writeback is 12360cb5950fSFilipe Manana * triggered (except in a case of free space fragmentation). 12370cb5950fSFilipe Manana */ 12380cb5950fSFilipe Manana if (test_range_bit(&inode->io_tree, cur, cur + range_len - 1, 12390cb5950fSFilipe Manana EXTENT_DELALLOC, 0, NULL)) 12400cb5950fSFilipe Manana goto next; 12410cb5950fSFilipe Manana 12420cb5950fSFilipe Manana /* 1243eb793cf8SQu Wenruo * For do_compress case, we want to compress all valid file 1244eb793cf8SQu Wenruo * extents, thus no @extent_thresh or mergeable check. 1245eb793cf8SQu Wenruo */ 1246eb793cf8SQu Wenruo if (do_compress) 1247eb793cf8SQu Wenruo goto add; 1248eb793cf8SQu Wenruo 1249eb793cf8SQu Wenruo /* Skip too large extent */ 12500cb5950fSFilipe Manana if (range_len >= extent_thresh) 1251eb793cf8SQu Wenruo goto next; 1252eb793cf8SQu Wenruo 1253e9eec721SQu Wenruo next_mergeable = defrag_check_next_extent(&inode->vfs_inode, em, 1254e9eec721SQu Wenruo locked); 1255eb793cf8SQu Wenruo if (!next_mergeable) { 1256eb793cf8SQu Wenruo struct defrag_target_range *last; 1257eb793cf8SQu Wenruo 1258eb793cf8SQu Wenruo /* Empty target list, no way to merge with last entry */ 1259eb793cf8SQu Wenruo if (list_empty(target_list)) 1260eb793cf8SQu Wenruo goto next; 1261eb793cf8SQu Wenruo last = list_entry(target_list->prev, 1262eb793cf8SQu Wenruo struct defrag_target_range, list); 1263eb793cf8SQu Wenruo /* Not mergeable with last entry */ 1264eb793cf8SQu Wenruo if (last->start + last->len != cur) 1265eb793cf8SQu Wenruo goto next; 1266eb793cf8SQu Wenruo 1267eb793cf8SQu Wenruo /* Mergeable, fall through to add it to @target_list. */ 1268eb793cf8SQu Wenruo } 1269eb793cf8SQu Wenruo 1270eb793cf8SQu Wenruo add: 1271eb793cf8SQu Wenruo range_len = min(extent_map_end(em), start + len) - cur; 1272eb793cf8SQu Wenruo /* 1273eb793cf8SQu Wenruo * This one is a good target, check if it can be merged into 1274eb793cf8SQu Wenruo * last range of the target list. 1275eb793cf8SQu Wenruo */ 1276eb793cf8SQu Wenruo if (!list_empty(target_list)) { 1277eb793cf8SQu Wenruo struct defrag_target_range *last; 1278eb793cf8SQu Wenruo 1279eb793cf8SQu Wenruo last = list_entry(target_list->prev, 1280eb793cf8SQu Wenruo struct defrag_target_range, list); 1281eb793cf8SQu Wenruo ASSERT(last->start + last->len <= cur); 1282eb793cf8SQu Wenruo if (last->start + last->len == cur) { 1283eb793cf8SQu Wenruo /* Mergeable, enlarge the last entry */ 1284eb793cf8SQu Wenruo last->len += range_len; 1285eb793cf8SQu Wenruo goto next; 1286eb793cf8SQu Wenruo } 1287eb793cf8SQu Wenruo /* Fall through to allocate a new entry */ 1288eb793cf8SQu Wenruo } 1289eb793cf8SQu Wenruo 1290eb793cf8SQu Wenruo /* Allocate new defrag_target_range */ 1291eb793cf8SQu Wenruo new = kmalloc(sizeof(*new), GFP_NOFS); 1292eb793cf8SQu Wenruo if (!new) { 1293eb793cf8SQu Wenruo free_extent_map(em); 1294eb793cf8SQu Wenruo ret = -ENOMEM; 1295eb793cf8SQu Wenruo break; 1296eb793cf8SQu Wenruo } 1297eb793cf8SQu Wenruo new->start = cur; 1298eb793cf8SQu Wenruo new->len = range_len; 1299eb793cf8SQu Wenruo list_add_tail(&new->list, target_list); 1300eb793cf8SQu Wenruo 1301eb793cf8SQu Wenruo next: 1302eb793cf8SQu Wenruo cur = extent_map_end(em); 1303eb793cf8SQu Wenruo free_extent_map(em); 1304eb793cf8SQu Wenruo } 1305eb793cf8SQu Wenruo if (ret < 0) { 1306eb793cf8SQu Wenruo struct defrag_target_range *entry; 1307eb793cf8SQu Wenruo struct defrag_target_range *tmp; 1308eb793cf8SQu Wenruo 1309eb793cf8SQu Wenruo list_for_each_entry_safe(entry, tmp, target_list, list) { 1310eb793cf8SQu Wenruo list_del_init(&entry->list); 1311eb793cf8SQu Wenruo kfree(entry); 1312eb793cf8SQu Wenruo } 1313eb793cf8SQu Wenruo } 1314eb793cf8SQu Wenruo return ret; 1315eb793cf8SQu Wenruo } 1316eb793cf8SQu Wenruo 131722b398eeSQu Wenruo #define CLUSTER_SIZE (SZ_256K) 131822b398eeSQu Wenruo 131922b398eeSQu Wenruo /* 132022b398eeSQu Wenruo * Defrag one contiguous target range. 132122b398eeSQu Wenruo * 132222b398eeSQu Wenruo * @inode: target inode 132322b398eeSQu Wenruo * @target: target range to defrag 132422b398eeSQu Wenruo * @pages: locked pages covering the defrag range 132522b398eeSQu Wenruo * @nr_pages: number of locked pages 132622b398eeSQu Wenruo * 132722b398eeSQu Wenruo * Caller should ensure: 132822b398eeSQu Wenruo * 132922b398eeSQu Wenruo * - Pages are prepared 133022b398eeSQu Wenruo * Pages should be locked, no ordered extent in the pages range, 133122b398eeSQu Wenruo * no writeback. 133222b398eeSQu Wenruo * 133322b398eeSQu Wenruo * - Extent bits are locked 133422b398eeSQu Wenruo */ 133522b398eeSQu Wenruo static int defrag_one_locked_target(struct btrfs_inode *inode, 133622b398eeSQu Wenruo struct defrag_target_range *target, 133722b398eeSQu Wenruo struct page **pages, int nr_pages, 133822b398eeSQu Wenruo struct extent_state **cached_state) 133922b398eeSQu Wenruo { 134022b398eeSQu Wenruo struct btrfs_fs_info *fs_info = inode->root->fs_info; 134122b398eeSQu Wenruo struct extent_changeset *data_reserved = NULL; 134222b398eeSQu Wenruo const u64 start = target->start; 134322b398eeSQu Wenruo const u64 len = target->len; 134422b398eeSQu Wenruo unsigned long last_index = (start + len - 1) >> PAGE_SHIFT; 134522b398eeSQu Wenruo unsigned long start_index = start >> PAGE_SHIFT; 134622b398eeSQu Wenruo unsigned long first_index = page_index(pages[0]); 134722b398eeSQu Wenruo int ret = 0; 134822b398eeSQu Wenruo int i; 134922b398eeSQu Wenruo 135022b398eeSQu Wenruo ASSERT(last_index - first_index + 1 <= nr_pages); 135122b398eeSQu Wenruo 135222b398eeSQu Wenruo ret = btrfs_delalloc_reserve_space(inode, &data_reserved, start, len); 135322b398eeSQu Wenruo if (ret < 0) 135422b398eeSQu Wenruo return ret; 135522b398eeSQu Wenruo clear_extent_bit(&inode->io_tree, start, start + len - 1, 135622b398eeSQu Wenruo EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 135722b398eeSQu Wenruo EXTENT_DEFRAG, 0, 0, cached_state); 135822b398eeSQu Wenruo set_extent_defrag(&inode->io_tree, start, start + len - 1, cached_state); 135922b398eeSQu Wenruo 136022b398eeSQu Wenruo /* Update the page status */ 136122b398eeSQu Wenruo for (i = start_index - first_index; i <= last_index - first_index; i++) { 136222b398eeSQu Wenruo ClearPageChecked(pages[i]); 136322b398eeSQu Wenruo btrfs_page_clamp_set_dirty(fs_info, pages[i], start, len); 136422b398eeSQu Wenruo } 136522b398eeSQu Wenruo btrfs_delalloc_release_extents(inode, len); 136622b398eeSQu Wenruo extent_changeset_free(data_reserved); 136722b398eeSQu Wenruo 136822b398eeSQu Wenruo return ret; 136922b398eeSQu Wenruo } 137022b398eeSQu Wenruo 1371e9eec721SQu Wenruo static int defrag_one_range(struct btrfs_inode *inode, u64 start, u32 len, 1372e9eec721SQu Wenruo u32 extent_thresh, u64 newer_than, bool do_compress) 1373e9eec721SQu Wenruo { 1374e9eec721SQu Wenruo struct extent_state *cached_state = NULL; 1375e9eec721SQu Wenruo struct defrag_target_range *entry; 1376e9eec721SQu Wenruo struct defrag_target_range *tmp; 1377e9eec721SQu Wenruo LIST_HEAD(target_list); 1378e9eec721SQu Wenruo struct page **pages; 1379e9eec721SQu Wenruo const u32 sectorsize = inode->root->fs_info->sectorsize; 1380e9eec721SQu Wenruo u64 last_index = (start + len - 1) >> PAGE_SHIFT; 1381e9eec721SQu Wenruo u64 start_index = start >> PAGE_SHIFT; 1382e9eec721SQu Wenruo unsigned int nr_pages = last_index - start_index + 1; 1383e9eec721SQu Wenruo int ret = 0; 1384e9eec721SQu Wenruo int i; 1385e9eec721SQu Wenruo 1386e9eec721SQu Wenruo ASSERT(nr_pages <= CLUSTER_SIZE / PAGE_SIZE); 1387e9eec721SQu Wenruo ASSERT(IS_ALIGNED(start, sectorsize) && IS_ALIGNED(len, sectorsize)); 1388e9eec721SQu Wenruo 1389e9eec721SQu Wenruo pages = kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS); 1390e9eec721SQu Wenruo if (!pages) 1391e9eec721SQu Wenruo return -ENOMEM; 1392e9eec721SQu Wenruo 1393e9eec721SQu Wenruo /* Prepare all pages */ 1394e9eec721SQu Wenruo for (i = 0; i < nr_pages; i++) { 1395e9eec721SQu Wenruo pages[i] = defrag_prepare_one_page(inode, start_index + i); 1396e9eec721SQu Wenruo if (IS_ERR(pages[i])) { 1397e9eec721SQu Wenruo ret = PTR_ERR(pages[i]); 1398e9eec721SQu Wenruo pages[i] = NULL; 1399e9eec721SQu Wenruo goto free_pages; 1400e9eec721SQu Wenruo } 1401e9eec721SQu Wenruo } 1402e9eec721SQu Wenruo for (i = 0; i < nr_pages; i++) 14034cb5300bSChris Mason wait_on_page_writeback(pages[i]); 14044cb5300bSChris Mason 1405e9eec721SQu Wenruo /* Lock the pages range */ 1406e9eec721SQu Wenruo lock_extent_bits(&inode->io_tree, start_index << PAGE_SHIFT, 1407e9eec721SQu Wenruo (last_index << PAGE_SHIFT) + PAGE_SIZE - 1, 1408e9eec721SQu Wenruo &cached_state); 1409e9eec721SQu Wenruo /* 1410e9eec721SQu Wenruo * Now we have a consistent view about the extent map, re-check 1411e9eec721SQu Wenruo * which range really needs to be defragged. 1412e9eec721SQu Wenruo * 1413e9eec721SQu Wenruo * And this time we have extent locked already, pass @locked = true 1414e9eec721SQu Wenruo * so that we won't relock the extent range and cause deadlock. 1415e9eec721SQu Wenruo */ 1416e9eec721SQu Wenruo ret = defrag_collect_targets(inode, start, len, extent_thresh, 1417e9eec721SQu Wenruo newer_than, do_compress, true, 1418e9eec721SQu Wenruo &target_list); 1419e9eec721SQu Wenruo if (ret < 0) 1420e9eec721SQu Wenruo goto unlock_extent; 14214cb5300bSChris Mason 1422e9eec721SQu Wenruo list_for_each_entry(entry, &target_list, list) { 1423e9eec721SQu Wenruo ret = defrag_one_locked_target(inode, entry, pages, nr_pages, 1424e9eec721SQu Wenruo &cached_state); 1425e9eec721SQu Wenruo if (ret < 0) 1426e9eec721SQu Wenruo break; 1427e9eec721SQu Wenruo } 1428e9eec721SQu Wenruo 1429e9eec721SQu Wenruo list_for_each_entry_safe(entry, tmp, &target_list, list) { 1430e9eec721SQu Wenruo list_del_init(&entry->list); 1431e9eec721SQu Wenruo kfree(entry); 1432e9eec721SQu Wenruo } 1433e9eec721SQu Wenruo unlock_extent: 1434e9eec721SQu Wenruo unlock_extent_cached(&inode->io_tree, start_index << PAGE_SHIFT, 1435e9eec721SQu Wenruo (last_index << PAGE_SHIFT) + PAGE_SIZE - 1, 1436e9eec721SQu Wenruo &cached_state); 1437e9eec721SQu Wenruo free_pages: 1438e9eec721SQu Wenruo for (i = 0; i < nr_pages; i++) { 1439e9eec721SQu Wenruo if (pages[i]) { 1440e9eec721SQu Wenruo unlock_page(pages[i]); 1441e9eec721SQu Wenruo put_page(pages[i]); 1442e9eec721SQu Wenruo } 1443e9eec721SQu Wenruo } 1444e9eec721SQu Wenruo kfree(pages); 1445e9eec721SQu Wenruo return ret; 1446e9eec721SQu Wenruo } 1447e9eec721SQu Wenruo 1448b18c3ab2SQu Wenruo static int defrag_one_cluster(struct btrfs_inode *inode, 1449b18c3ab2SQu Wenruo struct file_ra_state *ra, 1450b18c3ab2SQu Wenruo u64 start, u32 len, u32 extent_thresh, 1451b18c3ab2SQu Wenruo u64 newer_than, bool do_compress, 1452b18c3ab2SQu Wenruo unsigned long *sectors_defragged, 1453b18c3ab2SQu Wenruo unsigned long max_sectors) 1454b18c3ab2SQu Wenruo { 1455b18c3ab2SQu Wenruo const u32 sectorsize = inode->root->fs_info->sectorsize; 1456b18c3ab2SQu Wenruo struct defrag_target_range *entry; 1457b18c3ab2SQu Wenruo struct defrag_target_range *tmp; 1458b18c3ab2SQu Wenruo LIST_HEAD(target_list); 1459b18c3ab2SQu Wenruo int ret; 1460b18c3ab2SQu Wenruo 1461b18c3ab2SQu Wenruo BUILD_BUG_ON(!IS_ALIGNED(CLUSTER_SIZE, PAGE_SIZE)); 1462b18c3ab2SQu Wenruo ret = defrag_collect_targets(inode, start, len, extent_thresh, 1463b18c3ab2SQu Wenruo newer_than, do_compress, false, 1464b18c3ab2SQu Wenruo &target_list); 1465b18c3ab2SQu Wenruo if (ret < 0) 1466b18c3ab2SQu Wenruo goto out; 1467b18c3ab2SQu Wenruo 1468b18c3ab2SQu Wenruo list_for_each_entry(entry, &target_list, list) { 1469b18c3ab2SQu Wenruo u32 range_len = entry->len; 1470b18c3ab2SQu Wenruo 1471484167daSQu Wenruo /* Reached or beyond the limit */ 1472c080b414SQu Wenruo if (max_sectors && *sectors_defragged >= max_sectors) { 1473c080b414SQu Wenruo ret = 1; 1474b18c3ab2SQu Wenruo break; 1475c080b414SQu Wenruo } 1476b18c3ab2SQu Wenruo 1477b18c3ab2SQu Wenruo if (max_sectors) 1478b18c3ab2SQu Wenruo range_len = min_t(u32, range_len, 1479b18c3ab2SQu Wenruo (max_sectors - *sectors_defragged) * sectorsize); 1480b18c3ab2SQu Wenruo 1481b18c3ab2SQu Wenruo if (ra) 1482b18c3ab2SQu Wenruo page_cache_sync_readahead(inode->vfs_inode.i_mapping, 1483b18c3ab2SQu Wenruo ra, NULL, entry->start >> PAGE_SHIFT, 1484b18c3ab2SQu Wenruo ((entry->start + range_len - 1) >> PAGE_SHIFT) - 1485b18c3ab2SQu Wenruo (entry->start >> PAGE_SHIFT) + 1); 1486b18c3ab2SQu Wenruo /* 1487b18c3ab2SQu Wenruo * Here we may not defrag any range if holes are punched before 1488b18c3ab2SQu Wenruo * we locked the pages. 1489b18c3ab2SQu Wenruo * But that's fine, it only affects the @sectors_defragged 1490b18c3ab2SQu Wenruo * accounting. 1491b18c3ab2SQu Wenruo */ 1492b18c3ab2SQu Wenruo ret = defrag_one_range(inode, entry->start, range_len, 1493b18c3ab2SQu Wenruo extent_thresh, newer_than, do_compress); 1494b18c3ab2SQu Wenruo if (ret < 0) 1495b18c3ab2SQu Wenruo break; 1496484167daSQu Wenruo *sectors_defragged += range_len >> 1497484167daSQu Wenruo inode->root->fs_info->sectorsize_bits; 1498b18c3ab2SQu Wenruo } 1499b18c3ab2SQu Wenruo out: 1500b18c3ab2SQu Wenruo list_for_each_entry_safe(entry, tmp, &target_list, list) { 1501b18c3ab2SQu Wenruo list_del_init(&entry->list); 1502b18c3ab2SQu Wenruo kfree(entry); 1503b18c3ab2SQu Wenruo } 1504b18c3ab2SQu Wenruo return ret; 1505b18c3ab2SQu Wenruo } 15067f458a38SFilipe Manana 15077f458a38SFilipe Manana /* 15081ccc2e8aSQu Wenruo * Entry point to file defragmentation. 15091ccc2e8aSQu Wenruo * 15101ccc2e8aSQu Wenruo * @inode: inode to be defragged 15111ccc2e8aSQu Wenruo * @ra: readahead state (can be NUL) 15121ccc2e8aSQu Wenruo * @range: defrag options including range and flags 15131ccc2e8aSQu Wenruo * @newer_than: minimum transid to defrag 15141ccc2e8aSQu Wenruo * @max_to_defrag: max number of sectors to be defragged, if 0, the whole inode 15151ccc2e8aSQu Wenruo * will be defragged. 1516484167daSQu Wenruo * 1517484167daSQu Wenruo * Return <0 for error. 1518c080b414SQu Wenruo * Return >=0 for the number of sectors defragged, and range->start will be updated 1519c080b414SQu Wenruo * to indicate the file offset where next defrag should be started at. 1520c080b414SQu Wenruo * (Mostly for autodefrag, which sets @max_to_defrag thus we may exit early without 1521c080b414SQu Wenruo * defragging all the range). 15227f458a38SFilipe Manana */ 15231ccc2e8aSQu Wenruo int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra, 15244cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 15254cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 15264cb5300bSChris Mason { 15270b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 15287b508037SQu Wenruo unsigned long sectors_defragged = 0; 1529151a31b2SLi Zefan u64 isize = i_size_read(inode); 15307b508037SQu Wenruo u64 cur; 15317b508037SQu Wenruo u64 last_byte; 15321e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 15331ccc2e8aSQu Wenruo bool ra_allocated = false; 15347b508037SQu Wenruo int compress_type = BTRFS_COMPRESS_ZLIB; 15357b508037SQu Wenruo int ret = 0; 15367b508037SQu Wenruo u32 extent_thresh = range->extent_thresh; 153727cdfde1SFilipe Manana pgoff_t start_index; 15384cb5300bSChris Mason 15390abd5b17SLiu Bo if (isize == 0) 15400abd5b17SLiu Bo return 0; 15410abd5b17SLiu Bo 15420abd5b17SLiu Bo if (range->start >= isize) 15430abd5b17SLiu Bo return -EINVAL; 15441a419d85SLi Zefan 15451e2ef46dSDavid Sterba if (do_compress) { 1546ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 15471a419d85SLi Zefan return -EINVAL; 15481a419d85SLi Zefan if (range->compress_type) 15491a419d85SLi Zefan compress_type = range->compress_type; 15501a419d85SLi Zefan } 1551f46b5a66SChristoph Hellwig 15520abd5b17SLiu Bo if (extent_thresh == 0) 1553ee22184bSByongho Lee extent_thresh = SZ_256K; 1554f46b5a66SChristoph Hellwig 15557b508037SQu Wenruo if (range->start + range->len > range->start) { 15567b508037SQu Wenruo /* Got a specific range */ 15576b34cd8eSFilipe Manana last_byte = min(isize, range->start + range->len); 15587b508037SQu Wenruo } else { 15597b508037SQu Wenruo /* Defrag until file end */ 15606b34cd8eSFilipe Manana last_byte = isize; 15617b508037SQu Wenruo } 15627b508037SQu Wenruo 15636b34cd8eSFilipe Manana /* Align the range */ 15646b34cd8eSFilipe Manana cur = round_down(range->start, fs_info->sectorsize); 15656b34cd8eSFilipe Manana last_byte = round_up(last_byte, fs_info->sectorsize) - 1; 15666b34cd8eSFilipe Manana 15674cb5300bSChris Mason /* 15681ccc2e8aSQu Wenruo * If we were not given a ra, allocate a readahead context. As 15690a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 15700a52d108SDavid Sterba * we don't error out. 15714cb5300bSChris Mason */ 15721ccc2e8aSQu Wenruo if (!ra) { 15731ccc2e8aSQu Wenruo ra_allocated = true; 157463e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 15750a52d108SDavid Sterba if (ra) 15764cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 15774cb5300bSChris Mason } 15784cb5300bSChris Mason 157927cdfde1SFilipe Manana /* 158027cdfde1SFilipe Manana * Make writeback start from the beginning of the range, so that the 158127cdfde1SFilipe Manana * defrag range can be written sequentially. 158227cdfde1SFilipe Manana */ 158327cdfde1SFilipe Manana start_index = cur >> PAGE_SHIFT; 158427cdfde1SFilipe Manana if (start_index < inode->i_mapping->writeback_index) 158527cdfde1SFilipe Manana inode->i_mapping->writeback_index = start_index; 158627cdfde1SFilipe Manana 15877b508037SQu Wenruo while (cur < last_byte) { 15883c9d31c7SFilipe Manana const unsigned long prev_sectors_defragged = sectors_defragged; 15897b508037SQu Wenruo u64 cluster_end; 15901e701a32SChris Mason 15917b508037SQu Wenruo /* The cluster size 256K should always be page aligned */ 15927b508037SQu Wenruo BUILD_BUG_ON(!IS_ALIGNED(CLUSTER_SIZE, PAGE_SIZE)); 15934cb5300bSChris Mason 1594b767c2fcSFilipe Manana if (btrfs_defrag_cancelled(fs_info)) { 1595b767c2fcSFilipe Manana ret = -EAGAIN; 1596b767c2fcSFilipe Manana break; 1597b767c2fcSFilipe Manana } 1598b767c2fcSFilipe Manana 15997b508037SQu Wenruo /* We want the cluster end at page boundary when possible */ 16007b508037SQu Wenruo cluster_end = (((cur >> PAGE_SHIFT) + 16017b508037SQu Wenruo (SZ_256K >> PAGE_SHIFT)) << PAGE_SHIFT) - 1; 16027b508037SQu Wenruo cluster_end = min(cluster_end, last_byte); 16034cb5300bSChris Mason 160464708539SJosef Bacik btrfs_inode_lock(inode, 0); 1605eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1606eede2bf3SOmar Sandoval ret = -ETXTBSY; 16077b508037SQu Wenruo btrfs_inode_unlock(inode, 0); 16087b508037SQu Wenruo break; 16097b508037SQu Wenruo } 16107b508037SQu Wenruo if (!(inode->i_sb->s_flags & SB_ACTIVE)) { 16117b508037SQu Wenruo btrfs_inode_unlock(inode, 0); 16127b508037SQu Wenruo break; 16137b508037SQu Wenruo } 16141e2ef46dSDavid Sterba if (do_compress) 1615eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 16167b508037SQu Wenruo ret = defrag_one_cluster(BTRFS_I(inode), ra, cur, 16177b508037SQu Wenruo cluster_end + 1 - cur, extent_thresh, 16187b508037SQu Wenruo newer_than, do_compress, 16197b508037SQu Wenruo §ors_defragged, max_to_defrag); 16203c9d31c7SFilipe Manana 16213c9d31c7SFilipe Manana if (sectors_defragged > prev_sectors_defragged) 16223c9d31c7SFilipe Manana balance_dirty_pages_ratelimited(inode->i_mapping); 16233c9d31c7SFilipe Manana 162464708539SJosef Bacik btrfs_inode_unlock(inode, 0); 16257b508037SQu Wenruo if (ret < 0) 16264cb5300bSChris Mason break; 16277b508037SQu Wenruo cur = cluster_end + 1; 1628c080b414SQu Wenruo if (ret > 0) { 1629c080b414SQu Wenruo ret = 0; 1630c080b414SQu Wenruo break; 1631c080b414SQu Wenruo } 16324cb5300bSChris Mason } 1633f46b5a66SChristoph Hellwig 16347b508037SQu Wenruo if (ra_allocated) 16357b508037SQu Wenruo kfree(ra); 1636c080b414SQu Wenruo /* 1637c080b414SQu Wenruo * Update range.start for autodefrag, this will indicate where to start 1638c080b414SQu Wenruo * in next run. 1639c080b414SQu Wenruo */ 1640c080b414SQu Wenruo range->start = cur; 16417b508037SQu Wenruo if (sectors_defragged) { 16427b508037SQu Wenruo /* 16437b508037SQu Wenruo * We have defragged some sectors, for compression case they 16447b508037SQu Wenruo * need to be written back immediately. 16457b508037SQu Wenruo */ 16467b508037SQu Wenruo if (range->flags & BTRFS_DEFRAG_RANGE_START_IO) { 16471e701a32SChris Mason filemap_flush(inode->i_mapping); 1648dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1649dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1650dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1651dec8ef90SFilipe Manana } 16527b508037SQu Wenruo if (range->compress_type == BTRFS_COMPRESS_LZO) 16530b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 16547b508037SQu Wenruo else if (range->compress_type == BTRFS_COMPRESS_ZSTD) 16555c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 16567b508037SQu Wenruo ret = sectors_defragged; 16571a419d85SLi Zefan } 16581e2ef46dSDavid Sterba if (do_compress) { 165964708539SJosef Bacik btrfs_inode_lock(inode, 0); 1660eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 166164708539SJosef Bacik btrfs_inode_unlock(inode, 0); 1662633085c7SFilipe David Borba Manana } 1663940100a4SChris Mason return ret; 1664f46b5a66SChristoph Hellwig } 1665f46b5a66SChristoph Hellwig 166617aaa434SDavid Sterba /* 166717aaa434SDavid Sterba * Try to start exclusive operation @type or cancel it if it's running. 166817aaa434SDavid Sterba * 166917aaa434SDavid Sterba * Return: 167017aaa434SDavid Sterba * 0 - normal mode, newly claimed op started 167117aaa434SDavid Sterba * >0 - normal mode, something else is running, 167217aaa434SDavid Sterba * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space 167317aaa434SDavid Sterba * ECANCELED - cancel mode, successful cancel 167417aaa434SDavid Sterba * ENOTCONN - cancel mode, operation not running anymore 167517aaa434SDavid Sterba */ 167617aaa434SDavid Sterba static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info, 167717aaa434SDavid Sterba enum btrfs_exclusive_operation type, bool cancel) 167817aaa434SDavid Sterba { 167917aaa434SDavid Sterba if (!cancel) { 168017aaa434SDavid Sterba /* Start normal op */ 168117aaa434SDavid Sterba if (!btrfs_exclop_start(fs_info, type)) 168217aaa434SDavid Sterba return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 168317aaa434SDavid Sterba /* Exclusive operation is now claimed */ 168417aaa434SDavid Sterba return 0; 168517aaa434SDavid Sterba } 168617aaa434SDavid Sterba 168717aaa434SDavid Sterba /* Cancel running op */ 168817aaa434SDavid Sterba if (btrfs_exclop_start_try_lock(fs_info, type)) { 168917aaa434SDavid Sterba /* 169017aaa434SDavid Sterba * This blocks any exclop finish from setting it to NONE, so we 169117aaa434SDavid Sterba * request cancellation. Either it runs and we will wait for it, 169217aaa434SDavid Sterba * or it has finished and no waiting will happen. 169317aaa434SDavid Sterba */ 169417aaa434SDavid Sterba atomic_inc(&fs_info->reloc_cancel_req); 169517aaa434SDavid Sterba btrfs_exclop_start_unlock(fs_info); 169617aaa434SDavid Sterba 169717aaa434SDavid Sterba if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags)) 169817aaa434SDavid Sterba wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING, 169917aaa434SDavid Sterba TASK_INTERRUPTIBLE); 170017aaa434SDavid Sterba 170117aaa434SDavid Sterba return -ECANCELED; 170217aaa434SDavid Sterba } 170317aaa434SDavid Sterba 170417aaa434SDavid Sterba /* Something else is running or none */ 170517aaa434SDavid Sterba return -ENOTCONN; 170617aaa434SDavid Sterba } 170717aaa434SDavid Sterba 1708198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 170976dda93cSYan, Zheng void __user *arg) 1710f46b5a66SChristoph Hellwig { 1711562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 17120b246afaSJeff Mahoney struct inode *inode = file_inode(file); 17130b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1714f46b5a66SChristoph Hellwig u64 new_size; 1715f46b5a66SChristoph Hellwig u64 old_size; 1716f46b5a66SChristoph Hellwig u64 devid = 1; 17170b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1718f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1719f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1720f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1721f46b5a66SChristoph Hellwig char *sizestr; 17229a40f122SGui Hecheng char *retptr; 1723f46b5a66SChristoph Hellwig char *devstr = NULL; 1724f46b5a66SChristoph Hellwig int ret = 0; 1725f46b5a66SChristoph Hellwig int mod = 0; 1726bb059a37SDavid Sterba bool cancel; 1727f46b5a66SChristoph Hellwig 1728e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1729e441d54dSChris Mason return -EPERM; 1730e441d54dSChris Mason 1731198605a8SMiao Xie ret = mnt_want_write_file(file); 1732198605a8SMiao Xie if (ret) 1733198605a8SMiao Xie return ret; 1734198605a8SMiao Xie 1735bb059a37SDavid Sterba /* 1736bb059a37SDavid Sterba * Read the arguments before checking exclusivity to be able to 1737bb059a37SDavid Sterba * distinguish regular resize and cancel 1738bb059a37SDavid Sterba */ 1739dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1740c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1741c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1742bb059a37SDavid Sterba goto out_drop; 1743c9e9f97bSIlya Dryomov } 17445516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1745f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1746bb059a37SDavid Sterba cancel = (strcmp("cancel", sizestr) == 0); 1747bb059a37SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel); 1748bb059a37SDavid Sterba if (ret) 1749bb059a37SDavid Sterba goto out_free; 1750bb059a37SDavid Sterba /* Exclusive operation is now claimed */ 1751bb059a37SDavid Sterba 1752f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1753f46b5a66SChristoph Hellwig if (devstr) { 1754f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1755f46b5a66SChristoph Hellwig *devstr = '\0'; 1756f46b5a66SChristoph Hellwig devstr = vol_args->name; 175758dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 175858dfae63SZhangZhen if (ret) 1759bb059a37SDavid Sterba goto out_finish; 1760dfd79829SMiao Xie if (!devid) { 1761dfd79829SMiao Xie ret = -EINVAL; 1762bb059a37SDavid Sterba goto out_finish; 1763dfd79829SMiao Xie } 17640b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1765f46b5a66SChristoph Hellwig } 1766dba60f3fSMiao Xie 1767562d7b15SJosef Bacik args.devid = devid; 1768562d7b15SJosef Bacik device = btrfs_find_device(fs_info->fs_devices, &args); 1769f46b5a66SChristoph Hellwig if (!device) { 17700b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1771c1c9ff7cSGeert Uytterhoeven devid); 1772dfd79829SMiao Xie ret = -ENODEV; 1773bb059a37SDavid Sterba goto out_finish; 1774f46b5a66SChristoph Hellwig } 1775dba60f3fSMiao Xie 1776ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 17770b246afaSJeff Mahoney btrfs_info(fs_info, 1778efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1779c1c9ff7cSGeert Uytterhoeven devid); 1780dfd79829SMiao Xie ret = -EPERM; 1781bb059a37SDavid Sterba goto out_finish; 17824e42ae1bSLiu Bo } 17834e42ae1bSLiu Bo 1784f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1785cda00ebaSChristoph Hellwig new_size = bdev_nr_bytes(device->bdev); 1786f46b5a66SChristoph Hellwig else { 1787f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1788f46b5a66SChristoph Hellwig mod = -1; 1789f46b5a66SChristoph Hellwig sizestr++; 1790f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1791f46b5a66SChristoph Hellwig mod = 1; 1792f46b5a66SChristoph Hellwig sizestr++; 1793f46b5a66SChristoph Hellwig } 17949a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 17959a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1796f46b5a66SChristoph Hellwig ret = -EINVAL; 1797bb059a37SDavid Sterba goto out_finish; 1798f46b5a66SChristoph Hellwig } 1799f46b5a66SChristoph Hellwig } 1800f46b5a66SChristoph Hellwig 1801401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1802dfd79829SMiao Xie ret = -EPERM; 1803bb059a37SDavid Sterba goto out_finish; 180463a212abSStefan Behrens } 180563a212abSStefan Behrens 18067cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1807f46b5a66SChristoph Hellwig 1808f46b5a66SChristoph Hellwig if (mod < 0) { 1809f46b5a66SChristoph Hellwig if (new_size > old_size) { 1810f46b5a66SChristoph Hellwig ret = -EINVAL; 1811bb059a37SDavid Sterba goto out_finish; 1812f46b5a66SChristoph Hellwig } 1813f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1814f46b5a66SChristoph Hellwig } else if (mod > 0) { 1815eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1816902c68a4SGui Hecheng ret = -ERANGE; 1817bb059a37SDavid Sterba goto out_finish; 1818eb8052e0SWenliang Fan } 1819f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1820f46b5a66SChristoph Hellwig } 1821f46b5a66SChristoph Hellwig 1822ee22184bSByongho Lee if (new_size < SZ_256M) { 1823f46b5a66SChristoph Hellwig ret = -EINVAL; 1824bb059a37SDavid Sterba goto out_finish; 1825f46b5a66SChristoph Hellwig } 1826cda00ebaSChristoph Hellwig if (new_size > bdev_nr_bytes(device->bdev)) { 1827f46b5a66SChristoph Hellwig ret = -EFBIG; 1828bb059a37SDavid Sterba goto out_finish; 1829f46b5a66SChristoph Hellwig } 1830f46b5a66SChristoph Hellwig 183147f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1832f46b5a66SChristoph Hellwig 1833f46b5a66SChristoph Hellwig if (new_size > old_size) { 1834a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 183598d5dc13STsutomu Itoh if (IS_ERR(trans)) { 183698d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1837bb059a37SDavid Sterba goto out_finish; 183898d5dc13STsutomu Itoh } 1839f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 18403a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1841ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1842f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 18430253f40eSjeff.liu } /* equal, nothing need to do */ 1844f46b5a66SChristoph Hellwig 1845faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1846faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1847faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1848faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 1849faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1850bb059a37SDavid Sterba out_finish: 1851bb059a37SDavid Sterba btrfs_exclop_finish(fs_info); 1852c9e9f97bSIlya Dryomov out_free: 1853f46b5a66SChristoph Hellwig kfree(vol_args); 1854bb059a37SDavid Sterba out_drop: 185518f39c41SIlya Dryomov mnt_drop_write_file(file); 1856f46b5a66SChristoph Hellwig return ret; 1857f46b5a66SChristoph Hellwig } 1858f46b5a66SChristoph Hellwig 18595d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 18604d4340c9SChristian Brauner struct user_namespace *mnt_userns, 186152f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 18625d54c67eSNikolay Borisov bool readonly, 18638696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1864f46b5a66SChristoph Hellwig { 1865f46b5a66SChristoph Hellwig int namelen; 18663de4586cSChris Mason int ret = 0; 1867f46b5a66SChristoph Hellwig 1868325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1869325c50e3SJeff Mahoney return -ENOTDIR; 1870325c50e3SJeff Mahoney 1871a874a63eSLiu Bo ret = mnt_want_write_file(file); 1872a874a63eSLiu Bo if (ret) 1873a874a63eSLiu Bo goto out; 1874a874a63eSLiu Bo 187572fd032eSSage Weil namelen = strlen(name); 187672fd032eSSage Weil if (strchr(name, '/')) { 1877f46b5a66SChristoph Hellwig ret = -EINVAL; 1878a874a63eSLiu Bo goto out_drop_write; 1879f46b5a66SChristoph Hellwig } 1880f46b5a66SChristoph Hellwig 188116780cabSChris Mason if (name[0] == '.' && 188216780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 188316780cabSChris Mason ret = -EEXIST; 1884a874a63eSLiu Bo goto out_drop_write; 188516780cabSChris Mason } 188616780cabSChris Mason 18873de4586cSChris Mason if (subvol) { 18884d4340c9SChristian Brauner ret = btrfs_mksubvol(&file->f_path, mnt_userns, name, 18894d4340c9SChristian Brauner namelen, NULL, readonly, inherit); 1890cb8e7090SChristoph Hellwig } else { 18912903ff01SAl Viro struct fd src = fdget(fd); 18923de4586cSChris Mason struct inode *src_inode; 18932903ff01SAl Viro if (!src.file) { 18943de4586cSChris Mason ret = -EINVAL; 1895a874a63eSLiu Bo goto out_drop_write; 18963de4586cSChris Mason } 18973de4586cSChris Mason 1898496ad9aaSAl Viro src_inode = file_inode(src.file); 1899496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1900c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1901efe120a0SFrank Holton "Snapshot src from another FS"); 190223ad5b17SKusanagi Kouichi ret = -EXDEV; 19034d4340c9SChristian Brauner } else if (!inode_owner_or_capable(mnt_userns, src_inode)) { 1904d0242061SDavid Sterba /* 1905d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1906d0242061SDavid Sterba * are limited to own subvolumes only 1907d0242061SDavid Sterba */ 1908d0242061SDavid Sterba ret = -EPERM; 1909ecd18815SAl Viro } else { 19104d4340c9SChristian Brauner ret = btrfs_mksnapshot(&file->f_path, mnt_userns, 19114d4340c9SChristian Brauner name, namelen, 191272fd032eSSage Weil BTRFS_I(src_inode)->root, 19135d54c67eSNikolay Borisov readonly, inherit); 1914ecd18815SAl Viro } 19152903ff01SAl Viro fdput(src); 1916cb8e7090SChristoph Hellwig } 1917a874a63eSLiu Bo out_drop_write: 1918a874a63eSLiu Bo mnt_drop_write_file(file); 1919f46b5a66SChristoph Hellwig out: 192072fd032eSSage Weil return ret; 192172fd032eSSage Weil } 192272fd032eSSage Weil 192372fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1924fa0d2b9bSLi Zefan void __user *arg, int subvol) 192572fd032eSSage Weil { 1926fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 192772fd032eSSage Weil int ret; 192872fd032eSSage Weil 1929325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1930325c50e3SJeff Mahoney return -ENOTDIR; 1931325c50e3SJeff Mahoney 1932fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1933fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1934fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1935fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1936fa0d2b9bSLi Zefan 19374d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 19384d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 19394d4340c9SChristian Brauner false, NULL); 1940fa0d2b9bSLi Zefan 1941fa0d2b9bSLi Zefan kfree(vol_args); 1942fa0d2b9bSLi Zefan return ret; 1943fa0d2b9bSLi Zefan } 1944fa0d2b9bSLi Zefan 1945fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1946fa0d2b9bSLi Zefan void __user *arg, int subvol) 1947fa0d2b9bSLi Zefan { 1948fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1949fa0d2b9bSLi Zefan int ret; 1950b83cc969SLi Zefan bool readonly = false; 19516f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 195272fd032eSSage Weil 1953325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1954325c50e3SJeff Mahoney return -ENOTDIR; 1955325c50e3SJeff Mahoney 1956fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1957fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1958fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1959fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1960fdfb1e4fSLi Zefan 1961673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 1962b83cc969SLi Zefan ret = -EOPNOTSUPP; 1963c47ca32dSDan Carpenter goto free_args; 1964fdfb1e4fSLi Zefan } 1965fdfb1e4fSLi Zefan 1966b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1967b83cc969SLi Zefan readonly = true; 19686f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 19695011c5a6SDan Carpenter u64 nums; 19705011c5a6SDan Carpenter 19715011c5a6SDan Carpenter if (vol_args->size < sizeof(*inherit) || 19725011c5a6SDan Carpenter vol_args->size > PAGE_SIZE) { 19736f72c7e2SArne Jansen ret = -EINVAL; 1974c47ca32dSDan Carpenter goto free_args; 19756f72c7e2SArne Jansen } 19766f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 19776f72c7e2SArne Jansen if (IS_ERR(inherit)) { 19786f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1979c47ca32dSDan Carpenter goto free_args; 19806f72c7e2SArne Jansen } 19815011c5a6SDan Carpenter 19825011c5a6SDan Carpenter if (inherit->num_qgroups > PAGE_SIZE || 19835011c5a6SDan Carpenter inherit->num_ref_copies > PAGE_SIZE || 19845011c5a6SDan Carpenter inherit->num_excl_copies > PAGE_SIZE) { 19855011c5a6SDan Carpenter ret = -EINVAL; 19865011c5a6SDan Carpenter goto free_inherit; 19875011c5a6SDan Carpenter } 19885011c5a6SDan Carpenter 19895011c5a6SDan Carpenter nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + 19905011c5a6SDan Carpenter 2 * inherit->num_excl_copies; 19915011c5a6SDan Carpenter if (vol_args->size != struct_size(inherit, qgroups, nums)) { 19925011c5a6SDan Carpenter ret = -EINVAL; 19935011c5a6SDan Carpenter goto free_inherit; 19945011c5a6SDan Carpenter } 19956f72c7e2SArne Jansen } 199675eaa0e2SSage Weil 19974d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 19984d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 19994d4340c9SChristian Brauner readonly, inherit); 2000c47ca32dSDan Carpenter if (ret) 2001c47ca32dSDan Carpenter goto free_inherit; 2002c47ca32dSDan Carpenter free_inherit: 20036f72c7e2SArne Jansen kfree(inherit); 2004c47ca32dSDan Carpenter free_args: 2005c47ca32dSDan Carpenter kfree(vol_args); 2006f46b5a66SChristoph Hellwig return ret; 2007f46b5a66SChristoph Hellwig } 2008f46b5a66SChristoph Hellwig 20090caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 20100caa102dSLi Zefan void __user *arg) 20110caa102dSLi Zefan { 2012496ad9aaSAl Viro struct inode *inode = file_inode(file); 20130b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 20140caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 20150caa102dSLi Zefan int ret = 0; 20160caa102dSLi Zefan u64 flags = 0; 20170caa102dSLi Zefan 20184a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 20190caa102dSLi Zefan return -EINVAL; 20200caa102dSLi Zefan 20210b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 20220caa102dSLi Zefan if (btrfs_root_readonly(root)) 20230caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 20240b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 20250caa102dSLi Zefan 20260caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 20270caa102dSLi Zefan ret = -EFAULT; 20280caa102dSLi Zefan 20290caa102dSLi Zefan return ret; 20300caa102dSLi Zefan } 20310caa102dSLi Zefan 20320caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 20330caa102dSLi Zefan void __user *arg) 20340caa102dSLi Zefan { 2035496ad9aaSAl Viro struct inode *inode = file_inode(file); 20360b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 20370caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 20380caa102dSLi Zefan struct btrfs_trans_handle *trans; 20390caa102dSLi Zefan u64 root_flags; 20400caa102dSLi Zefan u64 flags; 20410caa102dSLi Zefan int ret = 0; 20420caa102dSLi Zefan 204339e1674fSChristian Brauner if (!inode_owner_or_capable(file_mnt_user_ns(file), inode)) 2044bd60ea0fSDavid Sterba return -EPERM; 2045bd60ea0fSDavid Sterba 2046b9ca0664SLiu Bo ret = mnt_want_write_file(file); 2047b9ca0664SLiu Bo if (ret) 2048b9ca0664SLiu Bo goto out; 20490caa102dSLi Zefan 20504a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 2051b9ca0664SLiu Bo ret = -EINVAL; 2052b9ca0664SLiu Bo goto out_drop_write; 2053b9ca0664SLiu Bo } 20540caa102dSLi Zefan 2055b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 2056b9ca0664SLiu Bo ret = -EFAULT; 2057b9ca0664SLiu Bo goto out_drop_write; 2058b9ca0664SLiu Bo } 20590caa102dSLi Zefan 2060b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 2061b9ca0664SLiu Bo ret = -EOPNOTSUPP; 2062b9ca0664SLiu Bo goto out_drop_write; 2063b9ca0664SLiu Bo } 20640caa102dSLi Zefan 20650b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 20660caa102dSLi Zefan 20670caa102dSLi Zefan /* nothing to do */ 20680caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 2069b9ca0664SLiu Bo goto out_drop_sem; 20700caa102dSLi Zefan 20710caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 20722c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 20730caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 20740caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 20752c686537SDavid Sterba } else { 20762c686537SDavid Sterba /* 20772c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 20782c686537SDavid Sterba * send 20792c686537SDavid Sterba */ 20802c686537SDavid Sterba spin_lock(&root->root_item_lock); 20812c686537SDavid Sterba if (root->send_in_progress == 0) { 20820caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 20830caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 20842c686537SDavid Sterba spin_unlock(&root->root_item_lock); 20852c686537SDavid Sterba } else { 20862c686537SDavid Sterba spin_unlock(&root->root_item_lock); 20870b246afaSJeff Mahoney btrfs_warn(fs_info, 20882c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 20892c686537SDavid Sterba root->root_key.objectid); 20902c686537SDavid Sterba ret = -EPERM; 20912c686537SDavid Sterba goto out_drop_sem; 20922c686537SDavid Sterba } 20932c686537SDavid Sterba } 20940caa102dSLi Zefan 20950caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 20960caa102dSLi Zefan if (IS_ERR(trans)) { 20970caa102dSLi Zefan ret = PTR_ERR(trans); 20980caa102dSLi Zefan goto out_reset; 20990caa102dSLi Zefan } 21000caa102dSLi Zefan 21010b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 21020caa102dSLi Zefan &root->root_key, &root->root_item); 21039417ebc8SNikolay Borisov if (ret < 0) { 21049417ebc8SNikolay Borisov btrfs_end_transaction(trans); 21059417ebc8SNikolay Borisov goto out_reset; 21069417ebc8SNikolay Borisov } 21070caa102dSLi Zefan 21089417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 21099417ebc8SNikolay Borisov 21100caa102dSLi Zefan out_reset: 21110caa102dSLi Zefan if (ret) 21120caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 2113b9ca0664SLiu Bo out_drop_sem: 21140b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 2115b9ca0664SLiu Bo out_drop_write: 2116b9ca0664SLiu Bo mnt_drop_write_file(file); 2117b9ca0664SLiu Bo out: 21180caa102dSLi Zefan return ret; 21190caa102dSLi Zefan } 21200caa102dSLi Zefan 2121ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 2122ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 2123ac8e9819SChris Mason { 2124abc6e134SChris Mason struct btrfs_key test; 2125abc6e134SChris Mason int ret; 2126abc6e134SChris Mason 2127abc6e134SChris Mason test.objectid = sk->min_objectid; 2128abc6e134SChris Mason test.type = sk->min_type; 2129abc6e134SChris Mason test.offset = sk->min_offset; 2130abc6e134SChris Mason 2131abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2132abc6e134SChris Mason if (ret < 0) 2133ac8e9819SChris Mason return 0; 2134abc6e134SChris Mason 2135abc6e134SChris Mason test.objectid = sk->max_objectid; 2136abc6e134SChris Mason test.type = sk->max_type; 2137abc6e134SChris Mason test.offset = sk->max_offset; 2138abc6e134SChris Mason 2139abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2140abc6e134SChris Mason if (ret > 0) 2141ac8e9819SChris Mason return 0; 2142ac8e9819SChris Mason return 1; 2143ac8e9819SChris Mason } 2144ac8e9819SChris Mason 2145df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2146ac8e9819SChris Mason struct btrfs_key *key, 2147ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 21489b6e817dSGerhard Heift size_t *buf_size, 2149ba346b35SGerhard Heift char __user *ubuf, 2150ac8e9819SChris Mason unsigned long *sk_offset, 2151ac8e9819SChris Mason int *num_found) 2152ac8e9819SChris Mason { 2153ac8e9819SChris Mason u64 found_transid; 2154ac8e9819SChris Mason struct extent_buffer *leaf; 2155ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2156dd81d459SNaohiro Aota struct btrfs_key test; 2157ac8e9819SChris Mason unsigned long item_off; 2158ac8e9819SChris Mason unsigned long item_len; 2159ac8e9819SChris Mason int nritems; 2160ac8e9819SChris Mason int i; 2161ac8e9819SChris Mason int slot; 2162ac8e9819SChris Mason int ret = 0; 2163ac8e9819SChris Mason 2164ac8e9819SChris Mason leaf = path->nodes[0]; 2165ac8e9819SChris Mason slot = path->slots[0]; 2166ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2167ac8e9819SChris Mason 2168ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2169ac8e9819SChris Mason i = nritems; 2170ac8e9819SChris Mason goto advance_key; 2171ac8e9819SChris Mason } 2172ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2173ac8e9819SChris Mason 2174ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2175ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 21763212fa14SJosef Bacik item_len = btrfs_item_size(leaf, i); 2177ac8e9819SChris Mason 217803b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 217903b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 218003b71c6cSGabriel de Perthuis continue; 218103b71c6cSGabriel de Perthuis 21829b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 21838f5f6178SGerhard Heift if (*num_found) { 2184ac8e9819SChris Mason ret = 1; 21858f5f6178SGerhard Heift goto out; 21868f5f6178SGerhard Heift } 21878f5f6178SGerhard Heift 21888f5f6178SGerhard Heift /* 21898f5f6178SGerhard Heift * return one empty item back for v1, which does not 21908f5f6178SGerhard Heift * handle -EOVERFLOW 21918f5f6178SGerhard Heift */ 21928f5f6178SGerhard Heift 21939b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2194ac8e9819SChris Mason item_len = 0; 21958f5f6178SGerhard Heift ret = -EOVERFLOW; 21968f5f6178SGerhard Heift } 2197ac8e9819SChris Mason 21989b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2199ac8e9819SChris Mason ret = 1; 220025c9bc2eSGerhard Heift goto out; 2201ac8e9819SChris Mason } 2202ac8e9819SChris Mason 2203ac8e9819SChris Mason sh.objectid = key->objectid; 2204ac8e9819SChris Mason sh.offset = key->offset; 2205ac8e9819SChris Mason sh.type = key->type; 2206ac8e9819SChris Mason sh.len = item_len; 2207ac8e9819SChris Mason sh.transid = found_transid; 2208ac8e9819SChris Mason 2209a48b73ecSJosef Bacik /* 2210a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 2211a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 2212a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 2213a48b73ecSJosef Bacik * properly this next time through 2214a48b73ecSJosef Bacik */ 2215a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 2216a48b73ecSJosef Bacik ret = 0; 2217ba346b35SGerhard Heift goto out; 2218ba346b35SGerhard Heift } 2219ba346b35SGerhard Heift 2220ac8e9819SChris Mason *sk_offset += sizeof(sh); 2221ac8e9819SChris Mason 2222ac8e9819SChris Mason if (item_len) { 2223ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2224a48b73ecSJosef Bacik /* 2225a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 2226a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 2227a48b73ecSJosef Bacik */ 2228a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 2229ba346b35SGerhard Heift item_off, item_len)) { 2230a48b73ecSJosef Bacik ret = 0; 2231a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 2232ba346b35SGerhard Heift goto out; 2233ba346b35SGerhard Heift } 2234ba346b35SGerhard Heift 2235ac8e9819SChris Mason *sk_offset += item_len; 2236ac8e9819SChris Mason } 2237e2156867SHugo Mills (*num_found)++; 2238ac8e9819SChris Mason 22398f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 22408f5f6178SGerhard Heift goto out; 22418f5f6178SGerhard Heift 224225c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 224325c9bc2eSGerhard Heift ret = 1; 224425c9bc2eSGerhard Heift goto out; 224525c9bc2eSGerhard Heift } 2246ac8e9819SChris Mason } 2247ac8e9819SChris Mason advance_key: 2248ac8e9819SChris Mason ret = 0; 2249dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2250dd81d459SNaohiro Aota test.type = sk->max_type; 2251dd81d459SNaohiro Aota test.offset = sk->max_offset; 2252dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2253dd81d459SNaohiro Aota ret = 1; 2254dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2255abc6e134SChris Mason key->offset++; 2256dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2257abc6e134SChris Mason key->offset = 0; 2258abc6e134SChris Mason key->type++; 2259dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2260abc6e134SChris Mason key->offset = 0; 2261abc6e134SChris Mason key->type = 0; 2262abc6e134SChris Mason key->objectid++; 2263abc6e134SChris Mason } else 2264abc6e134SChris Mason ret = 1; 226525c9bc2eSGerhard Heift out: 2266ba346b35SGerhard Heift /* 2267ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2268ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2269ba346b35SGerhard Heift * * all items were found 2270ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2271ba346b35SGerhard Heift * leaf 2272ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2273ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2274ba346b35SGerhard Heift */ 2275ac8e9819SChris Mason return ret; 2276ac8e9819SChris Mason } 2277ac8e9819SChris Mason 2278ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 227912544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 22809b6e817dSGerhard Heift size_t *buf_size, 2281ba346b35SGerhard Heift char __user *ubuf) 2282ac8e9819SChris Mason { 22830b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2284ac8e9819SChris Mason struct btrfs_root *root; 2285ac8e9819SChris Mason struct btrfs_key key; 2286ac8e9819SChris Mason struct btrfs_path *path; 2287ac8e9819SChris Mason int ret; 2288ac8e9819SChris Mason int num_found = 0; 2289ac8e9819SChris Mason unsigned long sk_offset = 0; 2290ac8e9819SChris Mason 22919b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 22929b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 229312544442SGerhard Heift return -EOVERFLOW; 22949b6e817dSGerhard Heift } 229512544442SGerhard Heift 2296ac8e9819SChris Mason path = btrfs_alloc_path(); 2297ac8e9819SChris Mason if (!path) 2298ac8e9819SChris Mason return -ENOMEM; 2299ac8e9819SChris Mason 2300ac8e9819SChris Mason if (sk->tree_id == 0) { 2301ac8e9819SChris Mason /* search the root of the inode that was passed */ 230200246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2303ac8e9819SChris Mason } else { 230456e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2305ac8e9819SChris Mason if (IS_ERR(root)) { 2306ac8e9819SChris Mason btrfs_free_path(path); 2307ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2308ac8e9819SChris Mason } 2309ac8e9819SChris Mason } 2310ac8e9819SChris Mason 2311ac8e9819SChris Mason key.objectid = sk->min_objectid; 2312ac8e9819SChris Mason key.type = sk->min_type; 2313ac8e9819SChris Mason key.offset = sk->min_offset; 2314ac8e9819SChris Mason 2315ac8e9819SChris Mason while (1) { 2316bb523b40SAndreas Gruenbacher ret = -EFAULT; 2317bb523b40SAndreas Gruenbacher if (fault_in_writeable(ubuf + sk_offset, *buf_size - sk_offset)) 2318a48b73ecSJosef Bacik break; 2319a48b73ecSJosef Bacik 23206174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2321ac8e9819SChris Mason if (ret != 0) { 2322ac8e9819SChris Mason if (ret > 0) 2323ac8e9819SChris Mason ret = 0; 2324ac8e9819SChris Mason goto err; 2325ac8e9819SChris Mason } 2326df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2327ac8e9819SChris Mason &sk_offset, &num_found); 2328b3b4aa74SDavid Sterba btrfs_release_path(path); 232925c9bc2eSGerhard Heift if (ret) 2330ac8e9819SChris Mason break; 2331ac8e9819SChris Mason 2332ac8e9819SChris Mason } 23338f5f6178SGerhard Heift if (ret > 0) 2334ac8e9819SChris Mason ret = 0; 2335ac8e9819SChris Mason err: 2336ac8e9819SChris Mason sk->nr_items = num_found; 233700246528SJosef Bacik btrfs_put_root(root); 2338ac8e9819SChris Mason btrfs_free_path(path); 2339ac8e9819SChris Mason return ret; 2340ac8e9819SChris Mason } 2341ac8e9819SChris Mason 2342ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2343ac8e9819SChris Mason void __user *argp) 2344ac8e9819SChris Mason { 2345ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2346ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2347ac8e9819SChris Mason struct inode *inode; 2348ac8e9819SChris Mason int ret; 23499b6e817dSGerhard Heift size_t buf_size; 2350ac8e9819SChris Mason 2351ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2352ac8e9819SChris Mason return -EPERM; 2353ac8e9819SChris Mason 2354ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2355ac8e9819SChris Mason 2356ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2357ba346b35SGerhard Heift return -EFAULT; 2358ba346b35SGerhard Heift 2359ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2360ac8e9819SChris Mason 2361496ad9aaSAl Viro inode = file_inode(file); 2362ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 23638f5f6178SGerhard Heift 23648f5f6178SGerhard Heift /* 23658f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 23668f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 23678f5f6178SGerhard Heift */ 23688f5f6178SGerhard Heift if (ret == -EOVERFLOW) 23698f5f6178SGerhard Heift ret = 0; 23708f5f6178SGerhard Heift 2371ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2372ac8e9819SChris Mason ret = -EFAULT; 2373ac8e9819SChris Mason return ret; 2374ac8e9819SChris Mason } 2375ac8e9819SChris Mason 2376cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2377cc68a8a5SGerhard Heift void __user *argp) 2378cc68a8a5SGerhard Heift { 2379cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2380cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2381cc68a8a5SGerhard Heift struct inode *inode; 2382cc68a8a5SGerhard Heift int ret; 2383cc68a8a5SGerhard Heift size_t buf_size; 2384ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2385cc68a8a5SGerhard Heift 2386cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2387cc68a8a5SGerhard Heift return -EPERM; 2388cc68a8a5SGerhard Heift 2389cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2390cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2391cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2392cc68a8a5SGerhard Heift return -EFAULT; 2393cc68a8a5SGerhard Heift 2394cc68a8a5SGerhard Heift buf_size = args.buf_size; 2395cc68a8a5SGerhard Heift 2396cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2397cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2398cc68a8a5SGerhard Heift buf_size = buf_limit; 2399cc68a8a5SGerhard Heift 2400cc68a8a5SGerhard Heift inode = file_inode(file); 2401cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2402718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2403cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2404cc68a8a5SGerhard Heift ret = -EFAULT; 2405cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2406cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2407cc68a8a5SGerhard Heift ret = -EFAULT; 2408cc68a8a5SGerhard Heift 240976dda93cSYan, Zheng return ret; 241076dda93cSYan, Zheng } 241176dda93cSYan, Zheng 241298d377a0STARUISI Hiroaki /* 2413ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2414ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 241598d377a0STARUISI Hiroaki */ 241698d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 241798d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 241898d377a0STARUISI Hiroaki { 241998d377a0STARUISI Hiroaki struct btrfs_root *root; 242098d377a0STARUISI Hiroaki struct btrfs_key key; 2421ac8e9819SChris Mason char *ptr; 242298d377a0STARUISI Hiroaki int ret = -1; 242398d377a0STARUISI Hiroaki int slot; 242498d377a0STARUISI Hiroaki int len; 242598d377a0STARUISI Hiroaki int total_len = 0; 242698d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 242798d377a0STARUISI Hiroaki struct extent_buffer *l; 242898d377a0STARUISI Hiroaki struct btrfs_path *path; 242998d377a0STARUISI Hiroaki 243098d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 243198d377a0STARUISI Hiroaki name[0]='\0'; 243298d377a0STARUISI Hiroaki return 0; 243398d377a0STARUISI Hiroaki } 243498d377a0STARUISI Hiroaki 243598d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 243698d377a0STARUISI Hiroaki if (!path) 243798d377a0STARUISI Hiroaki return -ENOMEM; 243898d377a0STARUISI Hiroaki 2439c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 244098d377a0STARUISI Hiroaki 244156e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 244298d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2443ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 244488234012SJosef Bacik root = NULL; 244588234012SJosef Bacik goto out; 244688234012SJosef Bacik } 244798d377a0STARUISI Hiroaki 244898d377a0STARUISI Hiroaki key.objectid = dirid; 244998d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 24508ad6fcabSChris Mason key.offset = (u64)-1; 245198d377a0STARUISI Hiroaki 245298d377a0STARUISI Hiroaki while (1) { 24530ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 245418674c6cSFilipe David Borba Manana if (ret < 0) 245518674c6cSFilipe David Borba Manana goto out; 245618674c6cSFilipe David Borba Manana else if (ret > 0) { 2457ac8e9819SChris Mason ret = -ENOENT; 245898d377a0STARUISI Hiroaki goto out; 2459ac8e9819SChris Mason } 246018674c6cSFilipe David Borba Manana 246118674c6cSFilipe David Borba Manana l = path->nodes[0]; 246218674c6cSFilipe David Borba Manana slot = path->slots[0]; 246398d377a0STARUISI Hiroaki 246498d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 246598d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 246698d377a0STARUISI Hiroaki ptr -= len + 1; 246798d377a0STARUISI Hiroaki total_len += len + 1; 2468a696cf35SFilipe David Borba Manana if (ptr < name) { 2469a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 247098d377a0STARUISI Hiroaki goto out; 2471a696cf35SFilipe David Borba Manana } 247298d377a0STARUISI Hiroaki 247398d377a0STARUISI Hiroaki *(ptr + len) = '/'; 247498d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 247598d377a0STARUISI Hiroaki 247698d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 247798d377a0STARUISI Hiroaki break; 247898d377a0STARUISI Hiroaki 2479b3b4aa74SDavid Sterba btrfs_release_path(path); 248098d377a0STARUISI Hiroaki key.objectid = key.offset; 24818ad6fcabSChris Mason key.offset = (u64)-1; 248298d377a0STARUISI Hiroaki dirid = key.objectid; 248398d377a0STARUISI Hiroaki } 248477906a50SLi Zefan memmove(name, ptr, total_len); 248598d377a0STARUISI Hiroaki name[total_len] = '\0'; 248698d377a0STARUISI Hiroaki ret = 0; 248798d377a0STARUISI Hiroaki out: 248800246528SJosef Bacik btrfs_put_root(root); 248998d377a0STARUISI Hiroaki btrfs_free_path(path); 2490ac8e9819SChris Mason return ret; 2491ac8e9819SChris Mason } 2492ac8e9819SChris Mason 24936623d9a0SChristian Brauner static int btrfs_search_path_in_tree_user(struct user_namespace *mnt_userns, 24946623d9a0SChristian Brauner struct inode *inode, 249523d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 249623d0b79dSTomohiro Misono { 249723d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 249823d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 249923d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 250023d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 250123d0b79dSTomohiro Misono u64 dirid = args->dirid; 250223d0b79dSTomohiro Misono unsigned long item_off; 250323d0b79dSTomohiro Misono unsigned long item_len; 250423d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 250523d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2506b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 250723d0b79dSTomohiro Misono struct btrfs_path *path; 250823d0b79dSTomohiro Misono struct btrfs_key key, key2; 250923d0b79dSTomohiro Misono struct extent_buffer *leaf; 251023d0b79dSTomohiro Misono struct inode *temp_inode; 251123d0b79dSTomohiro Misono char *ptr; 251223d0b79dSTomohiro Misono int slot; 251323d0b79dSTomohiro Misono int len; 251423d0b79dSTomohiro Misono int total_len = 0; 251523d0b79dSTomohiro Misono int ret; 251623d0b79dSTomohiro Misono 251723d0b79dSTomohiro Misono path = btrfs_alloc_path(); 251823d0b79dSTomohiro Misono if (!path) 251923d0b79dSTomohiro Misono return -ENOMEM; 252023d0b79dSTomohiro Misono 252123d0b79dSTomohiro Misono /* 252223d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 252323d0b79dSTomohiro Misono * construct the path in from the bottom up. 252423d0b79dSTomohiro Misono */ 252523d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 252623d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 252723d0b79dSTomohiro Misono 252856e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 252923d0b79dSTomohiro Misono if (IS_ERR(root)) { 253023d0b79dSTomohiro Misono ret = PTR_ERR(root); 253123d0b79dSTomohiro Misono goto out; 253223d0b79dSTomohiro Misono } 253323d0b79dSTomohiro Misono 253423d0b79dSTomohiro Misono key.objectid = dirid; 253523d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 253623d0b79dSTomohiro Misono key.offset = (u64)-1; 253723d0b79dSTomohiro Misono while (1) { 25380ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 25390ff40a91SMarcos Paulo de Souza if (ret < 0) 2540b8a49ae1SJosef Bacik goto out_put; 25410ff40a91SMarcos Paulo de Souza else if (ret > 0) { 254223d0b79dSTomohiro Misono ret = -ENOENT; 2543b8a49ae1SJosef Bacik goto out_put; 254423d0b79dSTomohiro Misono } 254523d0b79dSTomohiro Misono 254623d0b79dSTomohiro Misono leaf = path->nodes[0]; 254723d0b79dSTomohiro Misono slot = path->slots[0]; 254823d0b79dSTomohiro Misono 254923d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 255023d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 255123d0b79dSTomohiro Misono ptr -= len + 1; 255223d0b79dSTomohiro Misono total_len += len + 1; 255323d0b79dSTomohiro Misono if (ptr < args->path) { 255423d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2555b8a49ae1SJosef Bacik goto out_put; 255623d0b79dSTomohiro Misono } 255723d0b79dSTomohiro Misono 255823d0b79dSTomohiro Misono *(ptr + len) = '/'; 255923d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 256023d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 256123d0b79dSTomohiro Misono 256223d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 256323d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 256423d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 256523d0b79dSTomohiro Misono if (ret < 0) { 2566b8a49ae1SJosef Bacik goto out_put; 256723d0b79dSTomohiro Misono } else if (ret > 0) { 256823d0b79dSTomohiro Misono ret = -ENOENT; 2569b8a49ae1SJosef Bacik goto out_put; 257023d0b79dSTomohiro Misono } 257123d0b79dSTomohiro Misono 257223d0b79dSTomohiro Misono leaf = path->nodes[0]; 257323d0b79dSTomohiro Misono slot = path->slots[0]; 257423d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 257523d0b79dSTomohiro Misono if (key2.objectid != dirid) { 257623d0b79dSTomohiro Misono ret = -ENOENT; 2577b8a49ae1SJosef Bacik goto out_put; 257823d0b79dSTomohiro Misono } 257923d0b79dSTomohiro Misono 25800202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 25813ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 25823ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2583b8a49ae1SJosef Bacik goto out_put; 25843ca57bd6SMisono Tomohiro } 25856623d9a0SChristian Brauner ret = inode_permission(mnt_userns, temp_inode, 258647291baaSChristian Brauner MAY_READ | MAY_EXEC); 258723d0b79dSTomohiro Misono iput(temp_inode); 258823d0b79dSTomohiro Misono if (ret) { 258923d0b79dSTomohiro Misono ret = -EACCES; 2590b8a49ae1SJosef Bacik goto out_put; 259123d0b79dSTomohiro Misono } 259223d0b79dSTomohiro Misono 259323d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 259423d0b79dSTomohiro Misono break; 259523d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 259623d0b79dSTomohiro Misono ret = -EACCES; 2597b8a49ae1SJosef Bacik goto out_put; 259823d0b79dSTomohiro Misono } 259923d0b79dSTomohiro Misono 260023d0b79dSTomohiro Misono btrfs_release_path(path); 260123d0b79dSTomohiro Misono key.objectid = key.offset; 260223d0b79dSTomohiro Misono key.offset = (u64)-1; 260323d0b79dSTomohiro Misono dirid = key.objectid; 260423d0b79dSTomohiro Misono } 260523d0b79dSTomohiro Misono 260623d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 260723d0b79dSTomohiro Misono args->path[total_len] = '\0'; 260800246528SJosef Bacik btrfs_put_root(root); 2609b8a49ae1SJosef Bacik root = NULL; 261023d0b79dSTomohiro Misono btrfs_release_path(path); 261123d0b79dSTomohiro Misono } 261223d0b79dSTomohiro Misono 261323d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 261423d0b79dSTomohiro Misono key.objectid = treeid; 261523d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 261623d0b79dSTomohiro Misono key.offset = args->treeid; 2617b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 261823d0b79dSTomohiro Misono if (ret < 0) { 261923d0b79dSTomohiro Misono goto out; 262023d0b79dSTomohiro Misono } else if (ret > 0) { 262123d0b79dSTomohiro Misono ret = -ENOENT; 262223d0b79dSTomohiro Misono goto out; 262323d0b79dSTomohiro Misono } 262423d0b79dSTomohiro Misono 262523d0b79dSTomohiro Misono leaf = path->nodes[0]; 262623d0b79dSTomohiro Misono slot = path->slots[0]; 262723d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 262823d0b79dSTomohiro Misono 262923d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 26303212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot); 263123d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 263223d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 263323d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 263423d0b79dSTomohiro Misono ret = -EINVAL; 263523d0b79dSTomohiro Misono goto out; 263623d0b79dSTomohiro Misono } 263723d0b79dSTomohiro Misono 263823d0b79dSTomohiro Misono /* Copy subvolume's name */ 263923d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 264023d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 264123d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 264223d0b79dSTomohiro Misono args->name[item_len] = 0; 264323d0b79dSTomohiro Misono 2644b8a49ae1SJosef Bacik out_put: 264500246528SJosef Bacik btrfs_put_root(root); 264623d0b79dSTomohiro Misono out: 264723d0b79dSTomohiro Misono btrfs_free_path(path); 264823d0b79dSTomohiro Misono return ret; 264923d0b79dSTomohiro Misono } 265023d0b79dSTomohiro Misono 2651ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2652ac8e9819SChris Mason void __user *argp) 2653ac8e9819SChris Mason { 2654ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2655ac8e9819SChris Mason struct inode *inode; 265601b810b8SDavid Sterba int ret = 0; 2657ac8e9819SChris Mason 26582354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 26592354d08fSJulia Lawall if (IS_ERR(args)) 26602354d08fSJulia Lawall return PTR_ERR(args); 2661c2b96929SDan Carpenter 2662496ad9aaSAl Viro inode = file_inode(file); 2663ac8e9819SChris Mason 266401b810b8SDavid Sterba /* 266501b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 266601b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 266701b810b8SDavid Sterba */ 26681b53ac4dSChris Mason if (args->treeid == 0) 26691b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 26701b53ac4dSChris Mason 267101b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 267201b810b8SDavid Sterba args->name[0] = 0; 267301b810b8SDavid Sterba goto out; 267401b810b8SDavid Sterba } 267501b810b8SDavid Sterba 267601b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 267701b810b8SDavid Sterba ret = -EPERM; 267801b810b8SDavid Sterba goto out; 267901b810b8SDavid Sterba } 268001b810b8SDavid Sterba 2681ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2682ac8e9819SChris Mason args->treeid, args->objectid, 2683ac8e9819SChris Mason args->name); 2684ac8e9819SChris Mason 268501b810b8SDavid Sterba out: 2686ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2687ac8e9819SChris Mason ret = -EFAULT; 2688ac8e9819SChris Mason 2689ac8e9819SChris Mason kfree(args); 269098d377a0STARUISI Hiroaki return ret; 269198d377a0STARUISI Hiroaki } 269298d377a0STARUISI Hiroaki 269323d0b79dSTomohiro Misono /* 269423d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 269523d0b79dSTomohiro Misono * 269623d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 269723d0b79dSTomohiro Misono * 269823d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 269923d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 270023d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 270123d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 270223d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 270323d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 270423d0b79dSTomohiro Misono */ 270523d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 270623d0b79dSTomohiro Misono { 270723d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 270823d0b79dSTomohiro Misono struct inode *inode; 270923d0b79dSTomohiro Misono int ret; 271023d0b79dSTomohiro Misono 271123d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 271223d0b79dSTomohiro Misono if (IS_ERR(args)) 271323d0b79dSTomohiro Misono return PTR_ERR(args); 271423d0b79dSTomohiro Misono 271523d0b79dSTomohiro Misono inode = file_inode(file); 271623d0b79dSTomohiro Misono 271723d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 271823d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 271923d0b79dSTomohiro Misono /* 272023d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 272123d0b79dSTomohiro Misono * called 272223d0b79dSTomohiro Misono */ 272323d0b79dSTomohiro Misono kfree(args); 272423d0b79dSTomohiro Misono return -EACCES; 272523d0b79dSTomohiro Misono } 272623d0b79dSTomohiro Misono 27276623d9a0SChristian Brauner ret = btrfs_search_path_in_tree_user(file_mnt_user_ns(file), inode, args); 272823d0b79dSTomohiro Misono 272923d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 273023d0b79dSTomohiro Misono ret = -EFAULT; 273123d0b79dSTomohiro Misono 273223d0b79dSTomohiro Misono kfree(args); 273323d0b79dSTomohiro Misono return ret; 273423d0b79dSTomohiro Misono } 273523d0b79dSTomohiro Misono 2736b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 2737b64ec075STomohiro Misono static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) 2738b64ec075STomohiro Misono { 2739b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2740b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2741b64ec075STomohiro Misono struct btrfs_root *root; 2742b64ec075STomohiro Misono struct btrfs_path *path; 2743b64ec075STomohiro Misono struct btrfs_key key; 2744b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2745b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2746b64ec075STomohiro Misono struct extent_buffer *leaf; 2747b64ec075STomohiro Misono unsigned long item_off; 2748b64ec075STomohiro Misono unsigned long item_len; 2749b64ec075STomohiro Misono struct inode *inode; 2750b64ec075STomohiro Misono int slot; 2751b64ec075STomohiro Misono int ret = 0; 2752b64ec075STomohiro Misono 2753b64ec075STomohiro Misono path = btrfs_alloc_path(); 2754b64ec075STomohiro Misono if (!path) 2755b64ec075STomohiro Misono return -ENOMEM; 2756b64ec075STomohiro Misono 2757b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2758b64ec075STomohiro Misono if (!subvol_info) { 2759b64ec075STomohiro Misono btrfs_free_path(path); 2760b64ec075STomohiro Misono return -ENOMEM; 2761b64ec075STomohiro Misono } 2762b64ec075STomohiro Misono 2763b64ec075STomohiro Misono inode = file_inode(file); 2764b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2765b64ec075STomohiro Misono 2766b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2767b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 276856e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2769b64ec075STomohiro Misono if (IS_ERR(root)) { 2770b64ec075STomohiro Misono ret = PTR_ERR(root); 277104734e84SJosef Bacik goto out_free; 277204734e84SJosef Bacik } 2773b64ec075STomohiro Misono root_item = &root->root_item; 2774b64ec075STomohiro Misono 2775b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2776b64ec075STomohiro Misono 2777b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2778b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2779b64ec075STomohiro Misono 2780b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2781b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2782b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2783b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2784b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2785b64ec075STomohiro Misono 2786b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2787b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2788b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2789b64ec075STomohiro Misono 2790b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2791b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2792b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2793b64ec075STomohiro Misono 2794b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2795b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2796b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2797b64ec075STomohiro Misono 2798b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2799b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2800b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2801b64ec075STomohiro Misono 2802b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2803b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2804b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2805b64ec075STomohiro Misono key.offset = 0; 280604734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2807b64ec075STomohiro Misono if (ret < 0) { 2808b64ec075STomohiro Misono goto out; 2809b64ec075STomohiro Misono } else if (path->slots[0] >= 2810b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 281104734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2812b64ec075STomohiro Misono if (ret < 0) { 2813b64ec075STomohiro Misono goto out; 2814b64ec075STomohiro Misono } else if (ret > 0) { 2815b64ec075STomohiro Misono ret = -EUCLEAN; 2816b64ec075STomohiro Misono goto out; 2817b64ec075STomohiro Misono } 2818b64ec075STomohiro Misono } 2819b64ec075STomohiro Misono 2820b64ec075STomohiro Misono leaf = path->nodes[0]; 2821b64ec075STomohiro Misono slot = path->slots[0]; 2822b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2823b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2824b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2825b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2826b64ec075STomohiro Misono 2827b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2828b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2829b64ec075STomohiro Misono 2830b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2831b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 28323212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot) 2833b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2834b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2835b64ec075STomohiro Misono item_off, item_len); 2836b64ec075STomohiro Misono } else { 2837b64ec075STomohiro Misono ret = -ENOENT; 2838b64ec075STomohiro Misono goto out; 2839b64ec075STomohiro Misono } 2840b64ec075STomohiro Misono } 2841b64ec075STomohiro Misono 2842b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2843b64ec075STomohiro Misono ret = -EFAULT; 2844b64ec075STomohiro Misono 2845b64ec075STomohiro Misono out: 284600246528SJosef Bacik btrfs_put_root(root); 284704734e84SJosef Bacik out_free: 2848b64ec075STomohiro Misono btrfs_free_path(path); 2849b091f7feSWaiman Long kfree(subvol_info); 2850b64ec075STomohiro Misono return ret; 2851b64ec075STomohiro Misono } 2852b64ec075STomohiro Misono 285342e4b520STomohiro Misono /* 285442e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 285542e4b520STomohiro Misono * except the subvolume name. 285642e4b520STomohiro Misono */ 285742e4b520STomohiro Misono static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp) 285842e4b520STomohiro Misono { 285942e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 286042e4b520STomohiro Misono struct btrfs_root_ref *rref; 286142e4b520STomohiro Misono struct btrfs_root *root; 286242e4b520STomohiro Misono struct btrfs_path *path; 286342e4b520STomohiro Misono struct btrfs_key key; 286442e4b520STomohiro Misono struct extent_buffer *leaf; 286542e4b520STomohiro Misono struct inode *inode; 286642e4b520STomohiro Misono u64 objectid; 286742e4b520STomohiro Misono int slot; 286842e4b520STomohiro Misono int ret; 286942e4b520STomohiro Misono u8 found; 287042e4b520STomohiro Misono 287142e4b520STomohiro Misono path = btrfs_alloc_path(); 287242e4b520STomohiro Misono if (!path) 287342e4b520STomohiro Misono return -ENOMEM; 287442e4b520STomohiro Misono 287542e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 287642e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 287742e4b520STomohiro Misono btrfs_free_path(path); 287842e4b520STomohiro Misono return PTR_ERR(rootrefs); 287942e4b520STomohiro Misono } 288042e4b520STomohiro Misono 288142e4b520STomohiro Misono inode = file_inode(file); 288242e4b520STomohiro Misono root = BTRFS_I(inode)->root->fs_info->tree_root; 288342e4b520STomohiro Misono objectid = BTRFS_I(inode)->root->root_key.objectid; 288442e4b520STomohiro Misono 288542e4b520STomohiro Misono key.objectid = objectid; 288642e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 288742e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 288842e4b520STomohiro Misono found = 0; 288942e4b520STomohiro Misono 289042e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 289142e4b520STomohiro Misono if (ret < 0) { 289242e4b520STomohiro Misono goto out; 289342e4b520STomohiro Misono } else if (path->slots[0] >= 289442e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 289542e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 289642e4b520STomohiro Misono if (ret < 0) { 289742e4b520STomohiro Misono goto out; 289842e4b520STomohiro Misono } else if (ret > 0) { 289942e4b520STomohiro Misono ret = -EUCLEAN; 290042e4b520STomohiro Misono goto out; 290142e4b520STomohiro Misono } 290242e4b520STomohiro Misono } 290342e4b520STomohiro Misono while (1) { 290442e4b520STomohiro Misono leaf = path->nodes[0]; 290542e4b520STomohiro Misono slot = path->slots[0]; 290642e4b520STomohiro Misono 290742e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 290842e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 290942e4b520STomohiro Misono ret = 0; 291042e4b520STomohiro Misono goto out; 291142e4b520STomohiro Misono } 291242e4b520STomohiro Misono 291342e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 291442e4b520STomohiro Misono ret = -EOVERFLOW; 291542e4b520STomohiro Misono goto out; 291642e4b520STomohiro Misono } 291742e4b520STomohiro Misono 291842e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 291942e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 292042e4b520STomohiro Misono rootrefs->rootref[found].dirid = 292142e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 292242e4b520STomohiro Misono found++; 292342e4b520STomohiro Misono 292442e4b520STomohiro Misono ret = btrfs_next_item(root, path); 292542e4b520STomohiro Misono if (ret < 0) { 292642e4b520STomohiro Misono goto out; 292742e4b520STomohiro Misono } else if (ret > 0) { 292842e4b520STomohiro Misono ret = -EUCLEAN; 292942e4b520STomohiro Misono goto out; 293042e4b520STomohiro Misono } 293142e4b520STomohiro Misono } 293242e4b520STomohiro Misono 293342e4b520STomohiro Misono out: 293442e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 293542e4b520STomohiro Misono rootrefs->num_items = found; 293642e4b520STomohiro Misono /* update min_treeid for next search */ 293742e4b520STomohiro Misono if (found) 293842e4b520STomohiro Misono rootrefs->min_treeid = 293942e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 294042e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 294142e4b520STomohiro Misono ret = -EFAULT; 294242e4b520STomohiro Misono } 294342e4b520STomohiro Misono 294442e4b520STomohiro Misono kfree(rootrefs); 294542e4b520STomohiro Misono btrfs_free_path(path); 294642e4b520STomohiro Misono 294742e4b520STomohiro Misono return ret; 294842e4b520STomohiro Misono } 294942e4b520STomohiro Misono 295076dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2951949964c9SMarcos Paulo de Souza void __user *arg, 2952949964c9SMarcos Paulo de Souza bool destroy_v2) 295376dda93cSYan, Zheng { 295454563d41SAl Viro struct dentry *parent = file->f_path.dentry; 29550b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 295676dda93cSYan, Zheng struct dentry *dentry; 29572b0143b5SDavid Howells struct inode *dir = d_inode(parent); 295876dda93cSYan, Zheng struct inode *inode; 295976dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 296076dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2961949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2962949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 2963c4ed533bSChristian Brauner struct user_namespace *mnt_userns = file_mnt_user_ns(file); 2964949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2965949964c9SMarcos Paulo de Souza int subvol_namelen; 296676dda93cSYan, Zheng int err = 0; 2967949964c9SMarcos Paulo de Souza bool destroy_parent = false; 296876dda93cSYan, Zheng 2969949964c9SMarcos Paulo de Souza if (destroy_v2) { 2970949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2971949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2972949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2973325c50e3SJeff Mahoney 2974949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2975949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2976949964c9SMarcos Paulo de Souza goto out; 2977949964c9SMarcos Paulo de Souza } 297876dda93cSYan, Zheng 2979949964c9SMarcos Paulo de Souza /* 2980949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2981949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2982949964c9SMarcos Paulo de Souza */ 2983949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2984949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2985949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2986949964c9SMarcos Paulo de Souza 2987949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2988949964c9SMarcos Paulo de Souza if (err) 2989949964c9SMarcos Paulo de Souza goto out; 2990949964c9SMarcos Paulo de Souza } else { 2991aabb34e7SChristian Brauner struct inode *old_dir; 2992c4ed533bSChristian Brauner 2993949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 299476dda93cSYan, Zheng err = -EINVAL; 299576dda93cSYan, Zheng goto out; 299676dda93cSYan, Zheng } 299776dda93cSYan, Zheng 2998a561be71SAl Viro err = mnt_want_write_file(file); 299976dda93cSYan, Zheng if (err) 300076dda93cSYan, Zheng goto out; 300176dda93cSYan, Zheng 3002949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 3003949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 3004949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 3005949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 3006949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 3007949964c9SMarcos Paulo de Souza goto out_drop_write; 3008949964c9SMarcos Paulo de Souza } 3009949964c9SMarcos Paulo de Souza 3010949964c9SMarcos Paulo de Souza /* 3011949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 3012949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 3013949964c9SMarcos Paulo de Souza */ 3014949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 3015949964c9SMarcos Paulo de Souza 3016949964c9SMarcos Paulo de Souza /* 3017949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 3018949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 3019949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 3020949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 3021949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 3022949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 3023949964c9SMarcos Paulo de Souza */ 3024949964c9SMarcos Paulo de Souza dput(dentry); 3025949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 3026949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 3027949964c9SMarcos Paulo de Souza goto out_drop_write; 3028949964c9SMarcos Paulo de Souza } 3029aabb34e7SChristian Brauner old_dir = dir; 3030949964c9SMarcos Paulo de Souza dir = d_inode(parent); 3031949964c9SMarcos Paulo de Souza 3032949964c9SMarcos Paulo de Souza /* 3033949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 3034949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 3035949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 3036949964c9SMarcos Paulo de Souza * new parent dentry. 3037949964c9SMarcos Paulo de Souza */ 3038949964c9SMarcos Paulo de Souza destroy_parent = true; 3039949964c9SMarcos Paulo de Souza 3040aabb34e7SChristian Brauner /* 3041aabb34e7SChristian Brauner * On idmapped mounts, deletion via subvolid is 3042aabb34e7SChristian Brauner * restricted to subvolumes that are immediate 3043aabb34e7SChristian Brauner * ancestors of the inode referenced by the file 3044aabb34e7SChristian Brauner * descriptor in the ioctl. Otherwise the idmapping 3045aabb34e7SChristian Brauner * could potentially be abused to delete subvolumes 3046aabb34e7SChristian Brauner * anywhere in the filesystem the user wouldn't be able 3047aabb34e7SChristian Brauner * to delete without an idmapped mount. 3048aabb34e7SChristian Brauner */ 3049aabb34e7SChristian Brauner if (old_dir != dir && mnt_userns != &init_user_ns) { 3050aabb34e7SChristian Brauner err = -EOPNOTSUPP; 3051aabb34e7SChristian Brauner goto free_parent; 3052aabb34e7SChristian Brauner } 3053aabb34e7SChristian Brauner 3054949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 3055949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 3056949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 3057949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 3058949964c9SMarcos Paulo de Souza goto free_parent; 3059949964c9SMarcos Paulo de Souza } 30601a9fd417SDavid Sterba /* subvol_name_ptr is already nul terminated */ 3061949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 3062949964c9SMarcos Paulo de Souza } 3063949964c9SMarcos Paulo de Souza } else { 3064949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 3065949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 3066949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 3067949964c9SMarcos Paulo de Souza 3068949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 3069949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 3070949964c9SMarcos Paulo de Souza 3071949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3072949964c9SMarcos Paulo de Souza if (err) 3073949964c9SMarcos Paulo de Souza goto out; 3074949964c9SMarcos Paulo de Souza } 3075949964c9SMarcos Paulo de Souza 3076949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 3077949964c9SMarcos Paulo de Souza 3078949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 3079949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 3080949964c9SMarcos Paulo de Souza err = -EINVAL; 3081949964c9SMarcos Paulo de Souza goto free_subvol_name; 3082949964c9SMarcos Paulo de Souza } 3083949964c9SMarcos Paulo de Souza 3084949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 3085949964c9SMarcos Paulo de Souza err = -ENOTDIR; 3086949964c9SMarcos Paulo de Souza goto free_subvol_name; 3087949964c9SMarcos Paulo de Souza } 3088521e0546SDavid Sterba 308900235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 309000235411SAl Viro if (err == -EINTR) 3091949964c9SMarcos Paulo de Souza goto free_subvol_name; 3092c4ed533bSChristian Brauner dentry = lookup_one(mnt_userns, subvol_name, parent, subvol_namelen); 309376dda93cSYan, Zheng if (IS_ERR(dentry)) { 309476dda93cSYan, Zheng err = PTR_ERR(dentry); 309576dda93cSYan, Zheng goto out_unlock_dir; 309676dda93cSYan, Zheng } 309776dda93cSYan, Zheng 30982b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 309976dda93cSYan, Zheng err = -ENOENT; 310076dda93cSYan, Zheng goto out_dput; 310176dda93cSYan, Zheng } 310276dda93cSYan, Zheng 31032b0143b5SDavid Howells inode = d_inode(dentry); 31044260f7c7SSage Weil dest = BTRFS_I(inode)->root; 31054260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 31064260f7c7SSage Weil /* 31074260f7c7SSage Weil * Regular user. Only allow this with a special mount 31084260f7c7SSage Weil * option, when the user has write+exec access to the 31094260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 31104260f7c7SSage Weil * allowed. 31114260f7c7SSage Weil * 31124260f7c7SSage Weil * Note that this is _not_ check that the subvol is 31134260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 31144260f7c7SSage Weil * otherwise be able to delete. 31154260f7c7SSage Weil * 31164260f7c7SSage Weil * Users who want to delete empty subvols should try 31174260f7c7SSage Weil * rmdir(2). 31184260f7c7SSage Weil */ 31194260f7c7SSage Weil err = -EPERM; 31200b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 31214260f7c7SSage Weil goto out_dput; 31224260f7c7SSage Weil 31234260f7c7SSage Weil /* 31244260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 31254260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 31264260f7c7SSage Weil * must be called on the dentry referencing the root 31274260f7c7SSage Weil * of the subvol, not a random directory contained 31284260f7c7SSage Weil * within it. 31294260f7c7SSage Weil */ 31304260f7c7SSage Weil err = -EINVAL; 31314260f7c7SSage Weil if (root == dest) 31324260f7c7SSage Weil goto out_dput; 31334260f7c7SSage Weil 3134c4ed533bSChristian Brauner err = inode_permission(mnt_userns, inode, MAY_WRITE | MAY_EXEC); 31354260f7c7SSage Weil if (err) 31364260f7c7SSage Weil goto out_dput; 31375c39da5bSMiao Xie } 31384260f7c7SSage Weil 31395c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 3140c4ed533bSChristian Brauner err = btrfs_may_delete(mnt_userns, dir, dentry, 1); 31414260f7c7SSage Weil if (err) 31424260f7c7SSage Weil goto out_dput; 31434260f7c7SSage Weil 31444a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 314576dda93cSYan, Zheng err = -EINVAL; 314676dda93cSYan, Zheng goto out_dput; 314776dda93cSYan, Zheng } 314876dda93cSYan, Zheng 314964708539SJosef Bacik btrfs_inode_lock(inode, 0); 3150f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 315164708539SJosef Bacik btrfs_inode_unlock(inode, 0); 315246008d9dSAmir Goldstein if (!err) { 315346008d9dSAmir Goldstein fsnotify_rmdir(dir, dentry); 315476dda93cSYan, Zheng d_delete(dentry); 315546008d9dSAmir Goldstein } 3156fa6ac876SLiu Bo 315776dda93cSYan, Zheng out_dput: 315876dda93cSYan, Zheng dput(dentry); 315976dda93cSYan, Zheng out_unlock_dir: 316064708539SJosef Bacik btrfs_inode_unlock(dir, 0); 3161949964c9SMarcos Paulo de Souza free_subvol_name: 3162949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3163949964c9SMarcos Paulo de Souza free_parent: 3164949964c9SMarcos Paulo de Souza if (destroy_parent) 3165949964c9SMarcos Paulo de Souza dput(parent); 316600235411SAl Viro out_drop_write: 31672a79f17eSAl Viro mnt_drop_write_file(file); 316876dda93cSYan, Zheng out: 3169949964c9SMarcos Paulo de Souza kfree(vol_args2); 317076dda93cSYan, Zheng kfree(vol_args); 317176dda93cSYan, Zheng return err; 317276dda93cSYan, Zheng } 317376dda93cSYan, Zheng 31741e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3175f46b5a66SChristoph Hellwig { 3176496ad9aaSAl Viro struct inode *inode = file_inode(file); 3177f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3178c853a578SGoldwyn Rodrigues struct btrfs_ioctl_defrag_range_args range = {0}; 3179c146afadSYan Zheng int ret; 3180c146afadSYan Zheng 318125122d15SIlya Dryomov ret = mnt_want_write_file(file); 318225122d15SIlya Dryomov if (ret) 318325122d15SIlya Dryomov return ret; 3184b83cc969SLi Zefan 318525122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 318625122d15SIlya Dryomov ret = -EROFS; 318725122d15SIlya Dryomov goto out; 31885ac00addSStefan Behrens } 3189f46b5a66SChristoph Hellwig 3190f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3191f46b5a66SChristoph Hellwig case S_IFDIR: 3192e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3193e441d54dSChris Mason ret = -EPERM; 3194e441d54dSChris Mason goto out; 3195e441d54dSChris Mason } 3196de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3197f46b5a66SChristoph Hellwig break; 3198f46b5a66SChristoph Hellwig case S_IFREG: 3199616d374eSAdam Borowski /* 3200616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3201616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3202616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3203616d374eSAdam Borowski */ 3204616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 320547291baaSChristian Brauner inode_permission(&init_user_ns, inode, MAY_WRITE)) { 3206616d374eSAdam Borowski ret = -EPERM; 3207e441d54dSChris Mason goto out; 3208e441d54dSChris Mason } 32091e701a32SChris Mason 32101e701a32SChris Mason if (argp) { 3211c853a578SGoldwyn Rodrigues if (copy_from_user(&range, argp, sizeof(range))) { 32121e701a32SChris Mason ret = -EFAULT; 3213683be16eSDan Carpenter goto out; 32141e701a32SChris Mason } 32151e701a32SChris Mason /* compression requires us to start the IO */ 3216c853a578SGoldwyn Rodrigues if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 3217c853a578SGoldwyn Rodrigues range.flags |= BTRFS_DEFRAG_RANGE_START_IO; 3218c853a578SGoldwyn Rodrigues range.extent_thresh = (u32)-1; 32191e701a32SChris Mason } 32201e701a32SChris Mason } else { 32211e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 3222c853a578SGoldwyn Rodrigues range.len = (u64)-1; 32231e701a32SChris Mason } 32241ccc2e8aSQu Wenruo ret = btrfs_defrag_file(file_inode(file), &file->f_ra, 3225c853a578SGoldwyn Rodrigues &range, BTRFS_OLDEST_GENERATION, 0); 32264cb5300bSChris Mason if (ret > 0) 32274cb5300bSChris Mason ret = 0; 3228f46b5a66SChristoph Hellwig break; 32298929ecfaSYan, Zheng default: 32308929ecfaSYan, Zheng ret = -EINVAL; 3231f46b5a66SChristoph Hellwig } 3232e441d54dSChris Mason out: 323325122d15SIlya Dryomov mnt_drop_write_file(file); 3234e441d54dSChris Mason return ret; 3235f46b5a66SChristoph Hellwig } 3236f46b5a66SChristoph Hellwig 32372ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3238f46b5a66SChristoph Hellwig { 3239f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3240a174c0a2SNikolay Borisov bool restore_op = false; 3241f46b5a66SChristoph Hellwig int ret; 3242f46b5a66SChristoph Hellwig 3243e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3244e441d54dSChris Mason return -EPERM; 3245e441d54dSChris Mason 3246a174c0a2SNikolay Borisov if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) { 3247a174c0a2SNikolay Borisov if (!btrfs_exclop_start_try_lock(fs_info, BTRFS_EXCLOP_DEV_ADD)) 3248e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3249c9e9f97bSIlya Dryomov 3250a174c0a2SNikolay Borisov /* 3251a174c0a2SNikolay Borisov * We can do the device add because we have a paused balanced, 3252a174c0a2SNikolay Borisov * change the exclusive op type and remember we should bring 3253a174c0a2SNikolay Borisov * back the paused balance 3254a174c0a2SNikolay Borisov */ 3255a174c0a2SNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_DEV_ADD; 3256a174c0a2SNikolay Borisov btrfs_exclop_start_unlock(fs_info); 3257a174c0a2SNikolay Borisov restore_op = true; 3258a174c0a2SNikolay Borisov } 3259a174c0a2SNikolay Borisov 3260dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3261c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3262c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3263c9e9f97bSIlya Dryomov goto out; 3264c9e9f97bSIlya Dryomov } 3265f46b5a66SChristoph Hellwig 32665516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 32672ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3268f46b5a66SChristoph Hellwig 326943d20761SAnand Jain if (!ret) 32700b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 327143d20761SAnand Jain 3272f46b5a66SChristoph Hellwig kfree(vol_args); 3273c9e9f97bSIlya Dryomov out: 3274a174c0a2SNikolay Borisov if (restore_op) 3275a174c0a2SNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED); 3276a174c0a2SNikolay Borisov else 3277c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3278f46b5a66SChristoph Hellwig return ret; 3279f46b5a66SChristoph Hellwig } 3280f46b5a66SChristoph Hellwig 32816b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3282f46b5a66SChristoph Hellwig { 32831a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 32840b246afaSJeff Mahoney struct inode *inode = file_inode(file); 32850b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 32866b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 32873fa421deSJosef Bacik struct block_device *bdev = NULL; 32883fa421deSJosef Bacik fmode_t mode; 3289f46b5a66SChristoph Hellwig int ret; 329067ae34b6SDavid Sterba bool cancel = false; 3291f46b5a66SChristoph Hellwig 3292e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3293e441d54dSChris Mason return -EPERM; 3294e441d54dSChris Mason 3295dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3296d815b3f2SDan Carpenter if (IS_ERR(vol_args)) 3297d815b3f2SDan Carpenter return PTR_ERR(vol_args); 3298f46b5a66SChristoph Hellwig 3299748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3300fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3301fd4e994bSOmar Sandoval goto out; 3302fd4e994bSOmar Sandoval } 33031a15eb72SJosef Bacik 33046b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 33051a15eb72SJosef Bacik if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 33061a15eb72SJosef Bacik args.devid = vol_args->devid; 33071a15eb72SJosef Bacik } else if (!strcmp("cancel", vol_args->name)) { 330867ae34b6SDavid Sterba cancel = true; 33091a15eb72SJosef Bacik } else { 33101a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 33111a15eb72SJosef Bacik if (ret) 33121a15eb72SJosef Bacik goto out; 33131a15eb72SJosef Bacik } 33141a15eb72SJosef Bacik 33151a15eb72SJosef Bacik ret = mnt_want_write_file(file); 33161a15eb72SJosef Bacik if (ret) 33171a15eb72SJosef Bacik goto out; 331867ae34b6SDavid Sterba 331967ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 332067ae34b6SDavid Sterba cancel); 332167ae34b6SDavid Sterba if (ret) 33221a15eb72SJosef Bacik goto err_drop; 332367ae34b6SDavid Sterba 33241a15eb72SJosef Bacik /* Exclusive operation is now claimed */ 33251a15eb72SJosef Bacik ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); 332667ae34b6SDavid Sterba 3327c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3328183860f6SAnand Jain 33296b526ed7SAnand Jain if (!ret) { 3330735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 33310b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 33326b526ed7SAnand Jain vol_args->devid); 33336b526ed7SAnand Jain else 33340b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 33356b526ed7SAnand Jain vol_args->name); 33366b526ed7SAnand Jain } 3337c47ca32dSDan Carpenter err_drop: 33384ac20c70SIlya Dryomov mnt_drop_write_file(file); 33393fa421deSJosef Bacik if (bdev) 33403fa421deSJosef Bacik blkdev_put(bdev, mode); 33411a15eb72SJosef Bacik out: 33421a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 33431a15eb72SJosef Bacik kfree(vol_args); 3344f46b5a66SChristoph Hellwig return ret; 3345f46b5a66SChristoph Hellwig } 3346f46b5a66SChristoph Hellwig 3347f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3348f46b5a66SChristoph Hellwig { 33491a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 33500b246afaSJeff Mahoney struct inode *inode = file_inode(file); 33510b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3352f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 33533fa421deSJosef Bacik struct block_device *bdev = NULL; 33543fa421deSJosef Bacik fmode_t mode; 3355f46b5a66SChristoph Hellwig int ret; 3356*37b45995STom Rix bool cancel = false; 3357f46b5a66SChristoph Hellwig 3358f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3359f46b5a66SChristoph Hellwig return -EPERM; 3360f46b5a66SChristoph Hellwig 33611a15eb72SJosef Bacik vol_args = memdup_user(arg, sizeof(*vol_args)); 33621a15eb72SJosef Bacik if (IS_ERR(vol_args)) 33631a15eb72SJosef Bacik return PTR_ERR(vol_args); 33641a15eb72SJosef Bacik 33651a15eb72SJosef Bacik vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 33661a15eb72SJosef Bacik if (!strcmp("cancel", vol_args->name)) { 33671a15eb72SJosef Bacik cancel = true; 33681a15eb72SJosef Bacik } else { 33691a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 33701a15eb72SJosef Bacik if (ret) 33711a15eb72SJosef Bacik goto out; 33721a15eb72SJosef Bacik } 33731a15eb72SJosef Bacik 3374f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3375f46b5a66SChristoph Hellwig if (ret) 33761a15eb72SJosef Bacik goto out; 3377f46b5a66SChristoph Hellwig 337867ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 337967ae34b6SDavid Sterba cancel); 338067ae34b6SDavid Sterba if (ret == 0) { 33811a15eb72SJosef Bacik ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); 3382f46b5a66SChristoph Hellwig if (!ret) 33830b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3384c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 338567ae34b6SDavid Sterba } 338667ae34b6SDavid Sterba 3387f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 33883fa421deSJosef Bacik if (bdev) 33893fa421deSJosef Bacik blkdev_put(bdev, mode); 33901a15eb72SJosef Bacik out: 33911a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 33921a15eb72SJosef Bacik kfree(vol_args); 3393f46b5a66SChristoph Hellwig return ret; 3394f46b5a66SChristoph Hellwig } 3395f46b5a66SChristoph Hellwig 33962ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 33972ff7e61eSJeff Mahoney void __user *arg) 3398475f6387SJan Schmidt { 3399027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3400475f6387SJan Schmidt struct btrfs_device *device; 34010b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3402137c5418SJohannes Thumshirn u64 flags_in; 3403027ed2f0SLi Zefan int ret = 0; 3404475f6387SJan Schmidt 3405137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3406137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3407137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3408137c5418SJohannes Thumshirn 3409137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3410137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3411027ed2f0SLi Zefan 3412d03262c7SDavid Sterba rcu_read_lock(); 3413027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3414475f6387SJan Schmidt 3415d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3416027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3417027ed2f0SLi Zefan fi_args->max_id = device->devid; 3418475f6387SJan Schmidt } 3419d03262c7SDavid Sterba rcu_read_unlock(); 3420475f6387SJan Schmidt 3421de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3422bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3423bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3424bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 342580a773fbSDavid Sterba 3426137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3427137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3428137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3429137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3430137c5418SJohannes Thumshirn } 3431137c5418SJohannes Thumshirn 34320fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 34330fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 34340fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 34350fb408a5SJohannes Thumshirn } 34360fb408a5SJohannes Thumshirn 343749bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 343849bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 343949bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 344049bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 344149bac897SJohannes Thumshirn } 344249bac897SJohannes Thumshirn 3443027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3444027ed2f0SLi Zefan ret = -EFAULT; 3445475f6387SJan Schmidt 3446027ed2f0SLi Zefan kfree(fi_args); 3447027ed2f0SLi Zefan return ret; 3448475f6387SJan Schmidt } 3449475f6387SJan Schmidt 34502ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 34512ff7e61eSJeff Mahoney void __user *arg) 3452475f6387SJan Schmidt { 3453562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 3454475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3455475f6387SJan Schmidt struct btrfs_device *dev; 3456475f6387SJan Schmidt int ret = 0; 3457475f6387SJan Schmidt 3458475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3459475f6387SJan Schmidt if (IS_ERR(di_args)) 3460475f6387SJan Schmidt return PTR_ERR(di_args); 3461475f6387SJan Schmidt 3462562d7b15SJosef Bacik args.devid = di_args->devid; 3463dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3464562d7b15SJosef Bacik args.uuid = di_args->uuid; 3465475f6387SJan Schmidt 3466c5593ca3SDavid Sterba rcu_read_lock(); 3467562d7b15SJosef Bacik dev = btrfs_find_device(fs_info->fs_devices, &args); 3468475f6387SJan Schmidt if (!dev) { 3469475f6387SJan Schmidt ret = -ENODEV; 3470475f6387SJan Schmidt goto out; 3471475f6387SJan Schmidt } 3472475f6387SJan Schmidt 3473475f6387SJan Schmidt di_args->devid = dev->devid; 34747cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 34757cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3476475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3477a27202fbSJim Meyering if (dev->name) { 3478672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3479672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3480a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3481a27202fbSJim Meyering } else { 348299ba55adSStefan Behrens di_args->path[0] = '\0'; 3483a27202fbSJim Meyering } 3484475f6387SJan Schmidt 3485475f6387SJan Schmidt out: 3486c5593ca3SDavid Sterba rcu_read_unlock(); 3487475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3488475f6387SJan Schmidt ret = -EFAULT; 3489475f6387SJan Schmidt 3490475f6387SJan Schmidt kfree(di_args); 3491475f6387SJan Schmidt return ret; 3492475f6387SJan Schmidt } 3493475f6387SJan Schmidt 34946ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 34956ef5ed0dSJosef Bacik { 3496496ad9aaSAl Viro struct inode *inode = file_inode(file); 34970b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 34986ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 34996ef5ed0dSJosef Bacik struct btrfs_root *new_root; 35006ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 35016ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 35022a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 35036ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 35046ef5ed0dSJosef Bacik u64 objectid = 0; 35056ef5ed0dSJosef Bacik u64 dir_id; 35063c04ce01SMiao Xie int ret; 35076ef5ed0dSJosef Bacik 35086ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 35096ef5ed0dSJosef Bacik return -EPERM; 35106ef5ed0dSJosef Bacik 35113c04ce01SMiao Xie ret = mnt_want_write_file(file); 35123c04ce01SMiao Xie if (ret) 35133c04ce01SMiao Xie return ret; 35143c04ce01SMiao Xie 35153c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 35163c04ce01SMiao Xie ret = -EFAULT; 35173c04ce01SMiao Xie goto out; 35183c04ce01SMiao Xie } 35196ef5ed0dSJosef Bacik 35206ef5ed0dSJosef Bacik if (!objectid) 35211cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 35226ef5ed0dSJosef Bacik 352356e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 35243c04ce01SMiao Xie if (IS_ERR(new_root)) { 35253c04ce01SMiao Xie ret = PTR_ERR(new_root); 35263c04ce01SMiao Xie goto out; 35273c04ce01SMiao Xie } 35282a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 35292a2b5d62SJosef Bacik ret = -ENOENT; 35302a2b5d62SJosef Bacik goto out_free; 35312a2b5d62SJosef Bacik } 35326ef5ed0dSJosef Bacik 35336ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 35343c04ce01SMiao Xie if (!path) { 35353c04ce01SMiao Xie ret = -ENOMEM; 35362a2b5d62SJosef Bacik goto out_free; 35373c04ce01SMiao Xie } 35386ef5ed0dSJosef Bacik 35396ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 354098d5dc13STsutomu Itoh if (IS_ERR(trans)) { 35413c04ce01SMiao Xie ret = PTR_ERR(trans); 35422a2b5d62SJosef Bacik goto out_free; 35436ef5ed0dSJosef Bacik } 35446ef5ed0dSJosef Bacik 35450b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 35460b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 35476ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3548cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 35492a2b5d62SJosef Bacik btrfs_release_path(path); 35503a45bb20SJeff Mahoney btrfs_end_transaction(trans); 35510b246afaSJeff Mahoney btrfs_err(fs_info, 35525d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 35533c04ce01SMiao Xie ret = -ENOENT; 35542a2b5d62SJosef Bacik goto out_free; 35556ef5ed0dSJosef Bacik } 35566ef5ed0dSJosef Bacik 35576ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 35586ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 35596ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 35602a2b5d62SJosef Bacik btrfs_release_path(path); 35616ef5ed0dSJosef Bacik 35620b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 35633a45bb20SJeff Mahoney btrfs_end_transaction(trans); 35642a2b5d62SJosef Bacik out_free: 356500246528SJosef Bacik btrfs_put_root(new_root); 35662a2b5d62SJosef Bacik btrfs_free_path(path); 35673c04ce01SMiao Xie out: 35683c04ce01SMiao Xie mnt_drop_write_file(file); 35693c04ce01SMiao Xie return ret; 35706ef5ed0dSJosef Bacik } 35716ef5ed0dSJosef Bacik 3572c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3573bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3574bf5fc093SJosef Bacik { 357532da5386SDavid Sterba struct btrfs_block_group *block_group; 3576bf5fc093SJosef Bacik 3577bf5fc093SJosef Bacik space->total_bytes = 0; 3578bf5fc093SJosef Bacik space->used_bytes = 0; 3579bf5fc093SJosef Bacik space->flags = 0; 3580bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3581bf5fc093SJosef Bacik space->flags = block_group->flags; 3582b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3583bf38be65SDavid Sterba space->used_bytes += block_group->used; 3584bf5fc093SJosef Bacik } 3585bf5fc093SJosef Bacik } 3586bf5fc093SJosef Bacik 35872ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 35882ff7e61eSJeff Mahoney void __user *arg) 35891406e432SJosef Bacik { 35901406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 35911406e432SJosef Bacik struct btrfs_ioctl_space_info space; 35921406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 35937fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 359413f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 35951406e432SJosef Bacik struct btrfs_space_info *info; 3596315d8e98SColin Ian King static const u64 types[] = { 3597315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3598bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3599bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3600315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3601315d8e98SColin Ian King }; 3602bf5fc093SJosef Bacik int num_types = 4; 36037fde62bfSChris Mason int alloc_size; 36041406e432SJosef Bacik int ret = 0; 360551788b1bSDan Rosenberg u64 slot_count = 0; 3606bf5fc093SJosef Bacik int i, c; 36071406e432SJosef Bacik 36081406e432SJosef Bacik if (copy_from_user(&space_args, 36091406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 36101406e432SJosef Bacik sizeof(space_args))) 36111406e432SJosef Bacik return -EFAULT; 36121406e432SJosef Bacik 3613bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3614bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3615bf5fc093SJosef Bacik 3616bf5fc093SJosef Bacik info = NULL; 361772804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3618bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3619bf5fc093SJosef Bacik info = tmp; 3620bf5fc093SJosef Bacik break; 3621bf5fc093SJosef Bacik } 3622bf5fc093SJosef Bacik } 36231406e432SJosef Bacik 3624bf5fc093SJosef Bacik if (!info) 3625bf5fc093SJosef Bacik continue; 3626bf5fc093SJosef Bacik 3627bf5fc093SJosef Bacik down_read(&info->groups_sem); 3628bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3629bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3630bf5fc093SJosef Bacik slot_count++; 3631bf5fc093SJosef Bacik } 3632bf5fc093SJosef Bacik up_read(&info->groups_sem); 3633bf5fc093SJosef Bacik } 3634bf5fc093SJosef Bacik 363536523e95SDavid Sterba /* 363636523e95SDavid Sterba * Global block reserve, exported as a space_info 363736523e95SDavid Sterba */ 363836523e95SDavid Sterba slot_count++; 363936523e95SDavid Sterba 36407fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 36417fde62bfSChris Mason if (space_args.space_slots == 0) { 36427fde62bfSChris Mason space_args.total_spaces = slot_count; 36437fde62bfSChris Mason goto out; 36447fde62bfSChris Mason } 3645bf5fc093SJosef Bacik 364651788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3647bf5fc093SJosef Bacik 36487fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3649bf5fc093SJosef Bacik 36507fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 36517fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 36527fde62bfSChris Mason */ 365309cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 36547fde62bfSChris Mason return -ENOMEM; 36557fde62bfSChris Mason 36567fde62bfSChris Mason space_args.total_spaces = 0; 36578d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 36587fde62bfSChris Mason if (!dest) 36597fde62bfSChris Mason return -ENOMEM; 36607fde62bfSChris Mason dest_orig = dest; 36617fde62bfSChris Mason 36627fde62bfSChris Mason /* now we have a buffer to copy into */ 3663bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3664bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3665bf5fc093SJosef Bacik 366651788b1bSDan Rosenberg if (!slot_count) 366751788b1bSDan Rosenberg break; 366851788b1bSDan Rosenberg 3669bf5fc093SJosef Bacik info = NULL; 367072804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3671bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3672bf5fc093SJosef Bacik info = tmp; 36737fde62bfSChris Mason break; 3674bf5fc093SJosef Bacik } 3675bf5fc093SJosef Bacik } 36767fde62bfSChris Mason 3677bf5fc093SJosef Bacik if (!info) 3678bf5fc093SJosef Bacik continue; 3679bf5fc093SJosef Bacik down_read(&info->groups_sem); 3680bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3681bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3682c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3683c065f5b1SSu Yue &space); 36847fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 36851406e432SJosef Bacik dest++; 36861406e432SJosef Bacik space_args.total_spaces++; 368751788b1bSDan Rosenberg slot_count--; 36881406e432SJosef Bacik } 368951788b1bSDan Rosenberg if (!slot_count) 369051788b1bSDan Rosenberg break; 3691bf5fc093SJosef Bacik } 3692bf5fc093SJosef Bacik up_read(&info->groups_sem); 3693bf5fc093SJosef Bacik } 36941406e432SJosef Bacik 369536523e95SDavid Sterba /* 369636523e95SDavid Sterba * Add global block reserve 369736523e95SDavid Sterba */ 369836523e95SDavid Sterba if (slot_count) { 36990b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 370036523e95SDavid Sterba 370136523e95SDavid Sterba spin_lock(&block_rsv->lock); 370236523e95SDavid Sterba space.total_bytes = block_rsv->size; 370336523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 370436523e95SDavid Sterba spin_unlock(&block_rsv->lock); 370536523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 370636523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 370736523e95SDavid Sterba space_args.total_spaces++; 370836523e95SDavid Sterba } 370936523e95SDavid Sterba 37102eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 37117fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 37127fde62bfSChris Mason 37137fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 37147fde62bfSChris Mason ret = -EFAULT; 37157fde62bfSChris Mason 37167fde62bfSChris Mason kfree(dest_orig); 37177fde62bfSChris Mason out: 37187fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 37191406e432SJosef Bacik ret = -EFAULT; 37201406e432SJosef Bacik 37211406e432SJosef Bacik return ret; 37221406e432SJosef Bacik } 37231406e432SJosef Bacik 37249a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 37259a8c28beSMiao Xie void __user *argp) 372646204592SSage Weil { 372746204592SSage Weil struct btrfs_trans_handle *trans; 372846204592SSage Weil u64 transid; 372946204592SSage Weil 3730d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3731ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3732ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 373398d5dc13STsutomu Itoh return PTR_ERR(trans); 3734ff7c1d33SMiao Xie 3735ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3736ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3737ff7c1d33SMiao Xie goto out; 3738ff7c1d33SMiao Xie } 373946204592SSage Weil transid = trans->transid; 3740fdfbf020SJosef Bacik btrfs_commit_transaction_async(trans); 3741ff7c1d33SMiao Xie out: 374246204592SSage Weil if (argp) 374346204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 374446204592SSage Weil return -EFAULT; 374546204592SSage Weil return 0; 374646204592SSage Weil } 374746204592SSage Weil 37482ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 37499a8c28beSMiao Xie void __user *argp) 375046204592SSage Weil { 375146204592SSage Weil u64 transid; 375246204592SSage Weil 375346204592SSage Weil if (argp) { 375446204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 375546204592SSage Weil return -EFAULT; 375646204592SSage Weil } else { 375746204592SSage Weil transid = 0; /* current trans */ 375846204592SSage Weil } 37592ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 376046204592SSage Weil } 376146204592SSage Weil 3762b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3763475f6387SJan Schmidt { 37640b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3765475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3766b8e95489SMiao Xie int ret; 3767475f6387SJan Schmidt 3768475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3769475f6387SJan Schmidt return -EPERM; 3770475f6387SJan Schmidt 3771475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3772475f6387SJan Schmidt if (IS_ERR(sa)) 3773475f6387SJan Schmidt return PTR_ERR(sa); 3774475f6387SJan Schmidt 3775b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3776b8e95489SMiao Xie ret = mnt_want_write_file(file); 3777b8e95489SMiao Xie if (ret) 3778b8e95489SMiao Xie goto out; 3779b8e95489SMiao Xie } 3780b8e95489SMiao Xie 37810b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 378263a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 378363a212abSStefan Behrens 0); 3784475f6387SJan Schmidt 37855afe6ce7SFilipe Manana /* 37865afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 37875afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 37885afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 37895afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 37905afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 37915afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 37925afe6ce7SFilipe Manana * previously (btrfs-progs does this). 37935afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 37945afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 37955afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 37965afe6ce7SFilipe Manana */ 37975afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3798475f6387SJan Schmidt ret = -EFAULT; 3799475f6387SJan Schmidt 3800b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3801b8e95489SMiao Xie mnt_drop_write_file(file); 3802b8e95489SMiao Xie out: 3803475f6387SJan Schmidt kfree(sa); 3804475f6387SJan Schmidt return ret; 3805475f6387SJan Schmidt } 3806475f6387SJan Schmidt 38072ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3808475f6387SJan Schmidt { 3809475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3810475f6387SJan Schmidt return -EPERM; 3811475f6387SJan Schmidt 38122ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3813475f6387SJan Schmidt } 3814475f6387SJan Schmidt 38152ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3816475f6387SJan Schmidt void __user *arg) 3817475f6387SJan Schmidt { 3818475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3819475f6387SJan Schmidt int ret; 3820475f6387SJan Schmidt 3821475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3822475f6387SJan Schmidt return -EPERM; 3823475f6387SJan Schmidt 3824475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3825475f6387SJan Schmidt if (IS_ERR(sa)) 3826475f6387SJan Schmidt return PTR_ERR(sa); 3827475f6387SJan Schmidt 38282ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3829475f6387SJan Schmidt 38304fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3831475f6387SJan Schmidt ret = -EFAULT; 3832475f6387SJan Schmidt 3833475f6387SJan Schmidt kfree(sa); 3834475f6387SJan Schmidt return ret; 3835475f6387SJan Schmidt } 3836475f6387SJan Schmidt 38372ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3838b27f7c0cSDavid Sterba void __user *arg) 3839c11d2c23SStefan Behrens { 3840c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3841c11d2c23SStefan Behrens int ret; 3842c11d2c23SStefan Behrens 3843c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3844c11d2c23SStefan Behrens if (IS_ERR(sa)) 3845c11d2c23SStefan Behrens return PTR_ERR(sa); 3846c11d2c23SStefan Behrens 3847b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3848b27f7c0cSDavid Sterba kfree(sa); 3849b27f7c0cSDavid Sterba return -EPERM; 3850b27f7c0cSDavid Sterba } 3851b27f7c0cSDavid Sterba 38522ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3853c11d2c23SStefan Behrens 3854eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3855c11d2c23SStefan Behrens ret = -EFAULT; 3856c11d2c23SStefan Behrens 3857c11d2c23SStefan Behrens kfree(sa); 3858c11d2c23SStefan Behrens return ret; 3859c11d2c23SStefan Behrens } 3860c11d2c23SStefan Behrens 38612ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 38622ff7e61eSJeff Mahoney void __user *arg) 38633f6bcfbdSStefan Behrens { 38643f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 38653f6bcfbdSStefan Behrens int ret; 38663f6bcfbdSStefan Behrens 38673f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 38683f6bcfbdSStefan Behrens return -EPERM; 38693f6bcfbdSStefan Behrens 38703f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 38713f6bcfbdSStefan Behrens if (IS_ERR(p)) 38723f6bcfbdSStefan Behrens return PTR_ERR(p); 38733f6bcfbdSStefan Behrens 38743f6bcfbdSStefan Behrens switch (p->cmd) { 38753f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3876bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3877adfa97cbSIlya Dryomov ret = -EROFS; 3878adfa97cbSIlya Dryomov goto out; 3879adfa97cbSIlya Dryomov } 3880c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 3881e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 38823f6bcfbdSStefan Behrens } else { 38832ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3884c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 38853f6bcfbdSStefan Behrens } 38863f6bcfbdSStefan Behrens break; 38873f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 38880b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 38893f6bcfbdSStefan Behrens ret = 0; 38903f6bcfbdSStefan Behrens break; 38913f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 389217d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 389397282031SAnand Jain ret = 0; 38943f6bcfbdSStefan Behrens break; 38953f6bcfbdSStefan Behrens default: 38963f6bcfbdSStefan Behrens ret = -EINVAL; 38973f6bcfbdSStefan Behrens break; 38983f6bcfbdSStefan Behrens } 38993f6bcfbdSStefan Behrens 3900d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 39013f6bcfbdSStefan Behrens ret = -EFAULT; 3902adfa97cbSIlya Dryomov out: 39033f6bcfbdSStefan Behrens kfree(p); 39043f6bcfbdSStefan Behrens return ret; 39053f6bcfbdSStefan Behrens } 39063f6bcfbdSStefan Behrens 3907d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3908d7728c96SJan Schmidt { 3909d7728c96SJan Schmidt int ret = 0; 3910d7728c96SJan Schmidt int i; 3911740c3d22SChris Mason u64 rel_ptr; 3912d7728c96SJan Schmidt int size; 3913806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3914d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3915d7728c96SJan Schmidt struct btrfs_path *path; 3916d7728c96SJan Schmidt 391782b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3918d7728c96SJan Schmidt return -EPERM; 3919d7728c96SJan Schmidt 3920d7728c96SJan Schmidt path = btrfs_alloc_path(); 3921d7728c96SJan Schmidt if (!path) { 3922d7728c96SJan Schmidt ret = -ENOMEM; 3923d7728c96SJan Schmidt goto out; 3924d7728c96SJan Schmidt } 3925d7728c96SJan Schmidt 3926d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3927d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3928d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3929d7728c96SJan Schmidt ipa = NULL; 3930d7728c96SJan Schmidt goto out; 3931d7728c96SJan Schmidt } 3932d7728c96SJan Schmidt 3933d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3934d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3935d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3936d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3937d7728c96SJan Schmidt ipath = NULL; 3938d7728c96SJan Schmidt goto out; 3939d7728c96SJan Schmidt } 3940d7728c96SJan Schmidt 3941d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3942d7728c96SJan Schmidt if (ret < 0) 3943d7728c96SJan Schmidt goto out; 3944d7728c96SJan Schmidt 3945d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3946745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3947745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3948740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3949d7728c96SJan Schmidt } 3950d7728c96SJan Schmidt 3951718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3952718dc5faSOmar Sandoval ipath->fspath, size); 3953d7728c96SJan Schmidt if (ret) { 3954d7728c96SJan Schmidt ret = -EFAULT; 3955d7728c96SJan Schmidt goto out; 3956d7728c96SJan Schmidt } 3957d7728c96SJan Schmidt 3958d7728c96SJan Schmidt out: 3959d7728c96SJan Schmidt btrfs_free_path(path); 3960d7728c96SJan Schmidt free_ipath(ipath); 3961d7728c96SJan Schmidt kfree(ipa); 3962d7728c96SJan Schmidt 3963d7728c96SJan Schmidt return ret; 3964d7728c96SJan Schmidt } 3965d7728c96SJan Schmidt 3966d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3967d7728c96SJan Schmidt { 3968d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3969d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3970d7728c96SJan Schmidt 3971d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3972d7728c96SJan Schmidt inodes->bytes_left -= c; 3973d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3974d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3975d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3976d7728c96SJan Schmidt inodes->elem_cnt += 3; 3977d7728c96SJan Schmidt } else { 3978d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3979d7728c96SJan Schmidt inodes->bytes_left = 0; 3980d7728c96SJan Schmidt inodes->elem_missed += 3; 3981d7728c96SJan Schmidt } 3982d7728c96SJan Schmidt 3983d7728c96SJan Schmidt return 0; 3984d7728c96SJan Schmidt } 3985d7728c96SJan Schmidt 39862ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3987d24a67b2SZygo Blaxell void __user *arg, int version) 3988d7728c96SJan Schmidt { 3989d7728c96SJan Schmidt int ret = 0; 3990d7728c96SJan Schmidt int size; 3991d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3992d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3993d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3994d24a67b2SZygo Blaxell bool ignore_offset; 3995d7728c96SJan Schmidt 3996d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3997d7728c96SJan Schmidt return -EPERM; 3998d7728c96SJan Schmidt 3999d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 40007b9ea627SShailendra Verma if (IS_ERR(loi)) 40017b9ea627SShailendra Verma return PTR_ERR(loi); 4002d7728c96SJan Schmidt 4003d24a67b2SZygo Blaxell if (version == 1) { 4004d24a67b2SZygo Blaxell ignore_offset = false; 4005b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 4006d24a67b2SZygo Blaxell } else { 4007d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 4008d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 4009d24a67b2SZygo Blaxell ret = -EINVAL; 4010d24a67b2SZygo Blaxell goto out_loi; 4011d24a67b2SZygo Blaxell } 4012d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 4013d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 4014d24a67b2SZygo Blaxell ret = -EINVAL; 4015d24a67b2SZygo Blaxell goto out_loi; 4016d24a67b2SZygo Blaxell } 4017d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 4018b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 4019d24a67b2SZygo Blaxell } 4020d24a67b2SZygo Blaxell 4021d7728c96SJan Schmidt path = btrfs_alloc_path(); 4022d7728c96SJan Schmidt if (!path) { 4023d7728c96SJan Schmidt ret = -ENOMEM; 4024d7728c96SJan Schmidt goto out; 4025d7728c96SJan Schmidt } 4026d7728c96SJan Schmidt 4027d7728c96SJan Schmidt inodes = init_data_container(size); 4028d7728c96SJan Schmidt if (IS_ERR(inodes)) { 4029d7728c96SJan Schmidt ret = PTR_ERR(inodes); 4030d7728c96SJan Schmidt inodes = NULL; 4031d7728c96SJan Schmidt goto out; 4032d7728c96SJan Schmidt } 4033d7728c96SJan Schmidt 40342ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 4035d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 4036df031f07SLiu Bo if (ret == -EINVAL) 4037d7728c96SJan Schmidt ret = -ENOENT; 4038d7728c96SJan Schmidt if (ret < 0) 4039d7728c96SJan Schmidt goto out; 4040d7728c96SJan Schmidt 4041718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 4042718dc5faSOmar Sandoval size); 4043d7728c96SJan Schmidt if (ret) 4044d7728c96SJan Schmidt ret = -EFAULT; 4045d7728c96SJan Schmidt 4046d7728c96SJan Schmidt out: 4047d7728c96SJan Schmidt btrfs_free_path(path); 4048f54de068SDavid Sterba kvfree(inodes); 4049d24a67b2SZygo Blaxell out_loi: 4050d7728c96SJan Schmidt kfree(loi); 4051d7728c96SJan Schmidt 4052d7728c96SJan Schmidt return ret; 4053d7728c96SJan Schmidt } 4054d7728c96SJan Schmidt 4055008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 4056c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 4057c9e9f97bSIlya Dryomov { 4058c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 4059c9e9f97bSIlya Dryomov 4060c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 4061c9e9f97bSIlya Dryomov 40623009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 4063837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 4064837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 4065837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 4066a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 4067a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 4068837d5b6eSIlya Dryomov 4069c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 4070c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 4071c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 407219a39dceSIlya Dryomov 407319a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 407419a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 407519a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 4076c9e9f97bSIlya Dryomov } 4077c9e9f97bSIlya Dryomov 40789ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4079c9e9f97bSIlya Dryomov { 4080496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4081c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4082c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4083c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4084ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4085c9e9f97bSIlya Dryomov int ret; 4086c9e9f97bSIlya Dryomov 40876c405b24SNikolay Borisov if (!arg) 40886c405b24SNikolay Borisov btrfs_warn(fs_info, 40896c405b24SNikolay Borisov "IOC_BALANCE ioctl (v1) is deprecated and will be removed in kernel 5.18"); 40906c405b24SNikolay Borisov 4091c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4092c9e9f97bSIlya Dryomov return -EPERM; 4093c9e9f97bSIlya Dryomov 4094e54bfa31SLiu Bo ret = mnt_want_write_file(file); 40959ba1f6e4SLiu Bo if (ret) 40969ba1f6e4SLiu Bo return ret; 40979ba1f6e4SLiu Bo 4098ed0fb78fSIlya Dryomov again: 4099c3e1f96cSGoldwyn Rodrigues if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 4100c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4101ed0fb78fSIlya Dryomov need_unlock = true; 4102ed0fb78fSIlya Dryomov goto locked; 4103ed0fb78fSIlya Dryomov } 4104ed0fb78fSIlya Dryomov 4105ed0fb78fSIlya Dryomov /* 410601327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 4107ed0fb78fSIlya Dryomov * (1) some other op is running 4108ed0fb78fSIlya Dryomov * (2) balance is running 4109ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4110ed0fb78fSIlya Dryomov */ 4111ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4112ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4113ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 41143009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4115ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4116dccdb07bSDavid Sterba /* 4117dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 4118dccdb07bSDavid Sterba * we'll reexamine the status again. 4119dccdb07bSDavid Sterba */ 4120ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4121ed0fb78fSIlya Dryomov 4122ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 41233009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4124ed0fb78fSIlya Dryomov /* this is (3) */ 4125ed0fb78fSIlya Dryomov need_unlock = false; 4126ed0fb78fSIlya Dryomov goto locked; 4127ed0fb78fSIlya Dryomov } 4128ed0fb78fSIlya Dryomov 4129ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4130ed0fb78fSIlya Dryomov goto again; 4131ed0fb78fSIlya Dryomov } else { 4132ed0fb78fSIlya Dryomov /* this is (2) */ 4133ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4134ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4135ed0fb78fSIlya Dryomov goto out; 4136ed0fb78fSIlya Dryomov } 4137ed0fb78fSIlya Dryomov } else { 4138ed0fb78fSIlya Dryomov /* this is (1) */ 4139ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4140e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4141ed0fb78fSIlya Dryomov goto out; 4142ed0fb78fSIlya Dryomov } 4143ed0fb78fSIlya Dryomov 4144ed0fb78fSIlya Dryomov locked: 4145c9e9f97bSIlya Dryomov 4146c9e9f97bSIlya Dryomov if (arg) { 4147c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4148c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4149c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4150ed0fb78fSIlya Dryomov goto out_unlock; 4151c9e9f97bSIlya Dryomov } 4152de322263SIlya Dryomov 4153de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4154de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4155de322263SIlya Dryomov ret = -ENOTCONN; 4156de322263SIlya Dryomov goto out_bargs; 4157de322263SIlya Dryomov } 4158de322263SIlya Dryomov 4159de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4160de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4161de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4162de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4163efc0e69cSNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE); 4164de322263SIlya Dryomov 4165de322263SIlya Dryomov goto do_balance; 4166de322263SIlya Dryomov } 4167c9e9f97bSIlya Dryomov } else { 4168c9e9f97bSIlya Dryomov bargs = NULL; 4169c9e9f97bSIlya Dryomov } 4170c9e9f97bSIlya Dryomov 4171ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4172837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4173837d5b6eSIlya Dryomov goto out_bargs; 4174837d5b6eSIlya Dryomov } 4175837d5b6eSIlya Dryomov 41768d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4177c9e9f97bSIlya Dryomov if (!bctl) { 4178c9e9f97bSIlya Dryomov ret = -ENOMEM; 4179c9e9f97bSIlya Dryomov goto out_bargs; 4180c9e9f97bSIlya Dryomov } 4181c9e9f97bSIlya Dryomov 4182c9e9f97bSIlya Dryomov if (arg) { 4183c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4184c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4185c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4186c9e9f97bSIlya Dryomov 4187c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4188f43ffb60SIlya Dryomov } else { 4189f43ffb60SIlya Dryomov /* balance everything - no filters */ 4190f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4191c9e9f97bSIlya Dryomov } 4192c9e9f97bSIlya Dryomov 41938eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 41948eb93459SDavid Sterba ret = -EINVAL; 41950f89abf5SChristian Engelmayer goto out_bctl; 41968eb93459SDavid Sterba } 41978eb93459SDavid Sterba 4198de322263SIlya Dryomov do_balance: 4199c9e9f97bSIlya Dryomov /* 4200c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 4201c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 4202c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 4203c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 4204c9e9f97bSIlya Dryomov */ 4205ed0fb78fSIlya Dryomov need_unlock = false; 4206ed0fb78fSIlya Dryomov 42076fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 42080f89abf5SChristian Engelmayer bctl = NULL; 4209ed0fb78fSIlya Dryomov 4210d00c2d9cSFilipe Manana if ((ret == 0 || ret == -ECANCELED) && arg) { 4211c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4212c9e9f97bSIlya Dryomov ret = -EFAULT; 4213c9e9f97bSIlya Dryomov } 4214c9e9f97bSIlya Dryomov 42150f89abf5SChristian Engelmayer out_bctl: 42160f89abf5SChristian Engelmayer kfree(bctl); 4217c9e9f97bSIlya Dryomov out_bargs: 4218c9e9f97bSIlya Dryomov kfree(bargs); 4219ed0fb78fSIlya Dryomov out_unlock: 4220c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4221ed0fb78fSIlya Dryomov if (need_unlock) 4222c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 4223ed0fb78fSIlya Dryomov out: 4224e54bfa31SLiu Bo mnt_drop_write_file(file); 4225c9e9f97bSIlya Dryomov return ret; 4226c9e9f97bSIlya Dryomov } 4227c9e9f97bSIlya Dryomov 42282ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4229837d5b6eSIlya Dryomov { 4230837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4231837d5b6eSIlya Dryomov return -EPERM; 4232837d5b6eSIlya Dryomov 4233837d5b6eSIlya Dryomov switch (cmd) { 4234837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 42350b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4236a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 42370b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4238837d5b6eSIlya Dryomov } 4239837d5b6eSIlya Dryomov 4240837d5b6eSIlya Dryomov return -EINVAL; 4241837d5b6eSIlya Dryomov } 4242837d5b6eSIlya Dryomov 42432ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 424419a39dceSIlya Dryomov void __user *arg) 424519a39dceSIlya Dryomov { 424619a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 424719a39dceSIlya Dryomov int ret = 0; 424819a39dceSIlya Dryomov 424919a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 425019a39dceSIlya Dryomov return -EPERM; 425119a39dceSIlya Dryomov 425219a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 425319a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 425419a39dceSIlya Dryomov ret = -ENOTCONN; 425519a39dceSIlya Dryomov goto out; 425619a39dceSIlya Dryomov } 425719a39dceSIlya Dryomov 42588d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 425919a39dceSIlya Dryomov if (!bargs) { 426019a39dceSIlya Dryomov ret = -ENOMEM; 426119a39dceSIlya Dryomov goto out; 426219a39dceSIlya Dryomov } 426319a39dceSIlya Dryomov 4264008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 426519a39dceSIlya Dryomov 426619a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 426719a39dceSIlya Dryomov ret = -EFAULT; 426819a39dceSIlya Dryomov 426919a39dceSIlya Dryomov kfree(bargs); 427019a39dceSIlya Dryomov out: 427119a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 427219a39dceSIlya Dryomov return ret; 427319a39dceSIlya Dryomov } 427419a39dceSIlya Dryomov 4275905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 42765d13a37bSArne Jansen { 42770b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42780b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42795d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 42805d13a37bSArne Jansen int ret; 42815d13a37bSArne Jansen 42825d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42835d13a37bSArne Jansen return -EPERM; 42845d13a37bSArne Jansen 4285905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4286905b0ddaSMiao Xie if (ret) 4287905b0ddaSMiao Xie return ret; 42885d13a37bSArne Jansen 42895d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4290905b0ddaSMiao Xie if (IS_ERR(sa)) { 4291905b0ddaSMiao Xie ret = PTR_ERR(sa); 4292905b0ddaSMiao Xie goto drop_write; 4293905b0ddaSMiao Xie } 42945d13a37bSArne Jansen 42950b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 42965d13a37bSArne Jansen 42975d13a37bSArne Jansen switch (sa->cmd) { 42985d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4299340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 43005d13a37bSArne Jansen break; 43015d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4302340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 43035d13a37bSArne Jansen break; 43045d13a37bSArne Jansen default: 43055d13a37bSArne Jansen ret = -EINVAL; 43065d13a37bSArne Jansen break; 43075d13a37bSArne Jansen } 43085d13a37bSArne Jansen 43095d13a37bSArne Jansen kfree(sa); 43100b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4311905b0ddaSMiao Xie drop_write: 4312905b0ddaSMiao Xie mnt_drop_write_file(file); 43135d13a37bSArne Jansen return ret; 43145d13a37bSArne Jansen } 43155d13a37bSArne Jansen 4316905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 43175d13a37bSArne Jansen { 43180b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43190b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 43200b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 43215d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 43225d13a37bSArne Jansen struct btrfs_trans_handle *trans; 43235d13a37bSArne Jansen int ret; 43245d13a37bSArne Jansen int err; 43255d13a37bSArne Jansen 43265d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 43275d13a37bSArne Jansen return -EPERM; 43285d13a37bSArne Jansen 4329905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4330905b0ddaSMiao Xie if (ret) 4331905b0ddaSMiao Xie return ret; 43325d13a37bSArne Jansen 43335d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4334905b0ddaSMiao Xie if (IS_ERR(sa)) { 4335905b0ddaSMiao Xie ret = PTR_ERR(sa); 4336905b0ddaSMiao Xie goto drop_write; 4337905b0ddaSMiao Xie } 43385d13a37bSArne Jansen 43395d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43405d13a37bSArne Jansen if (IS_ERR(trans)) { 43415d13a37bSArne Jansen ret = PTR_ERR(trans); 43425d13a37bSArne Jansen goto out; 43435d13a37bSArne Jansen } 43445d13a37bSArne Jansen 43455d13a37bSArne Jansen if (sa->assign) { 43469f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 43475d13a37bSArne Jansen } else { 434839616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 43495d13a37bSArne Jansen } 43505d13a37bSArne Jansen 4351e082f563SQu Wenruo /* update qgroup status and info */ 4352280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4353e082f563SQu Wenruo if (err < 0) 43540b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4355ad8403dfSAnand Jain "failed to update qgroup status and info"); 43563a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 43575d13a37bSArne Jansen if (err && !ret) 43585d13a37bSArne Jansen ret = err; 43595d13a37bSArne Jansen 43605d13a37bSArne Jansen out: 43615d13a37bSArne Jansen kfree(sa); 4362905b0ddaSMiao Xie drop_write: 4363905b0ddaSMiao Xie mnt_drop_write_file(file); 43645d13a37bSArne Jansen return ret; 43655d13a37bSArne Jansen } 43665d13a37bSArne Jansen 4367905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 43685d13a37bSArne Jansen { 43690b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43700b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 43715d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 43725d13a37bSArne Jansen struct btrfs_trans_handle *trans; 43735d13a37bSArne Jansen int ret; 43745d13a37bSArne Jansen int err; 43755d13a37bSArne Jansen 43765d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 43775d13a37bSArne Jansen return -EPERM; 43785d13a37bSArne Jansen 4379905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4380905b0ddaSMiao Xie if (ret) 4381905b0ddaSMiao Xie return ret; 43825d13a37bSArne Jansen 43835d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4384905b0ddaSMiao Xie if (IS_ERR(sa)) { 4385905b0ddaSMiao Xie ret = PTR_ERR(sa); 4386905b0ddaSMiao Xie goto drop_write; 4387905b0ddaSMiao Xie } 43885d13a37bSArne Jansen 4389d86e56cfSMiao Xie if (!sa->qgroupid) { 4390d86e56cfSMiao Xie ret = -EINVAL; 4391d86e56cfSMiao Xie goto out; 4392d86e56cfSMiao Xie } 4393d86e56cfSMiao Xie 43945d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43955d13a37bSArne Jansen if (IS_ERR(trans)) { 43965d13a37bSArne Jansen ret = PTR_ERR(trans); 43975d13a37bSArne Jansen goto out; 43985d13a37bSArne Jansen } 43995d13a37bSArne Jansen 44005d13a37bSArne Jansen if (sa->create) { 440149a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 44025d13a37bSArne Jansen } else { 44033efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 44045d13a37bSArne Jansen } 44055d13a37bSArne Jansen 44063a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 44075d13a37bSArne Jansen if (err && !ret) 44085d13a37bSArne Jansen ret = err; 44095d13a37bSArne Jansen 44105d13a37bSArne Jansen out: 44115d13a37bSArne Jansen kfree(sa); 4412905b0ddaSMiao Xie drop_write: 4413905b0ddaSMiao Xie mnt_drop_write_file(file); 44145d13a37bSArne Jansen return ret; 44155d13a37bSArne Jansen } 44165d13a37bSArne Jansen 4417905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 44185d13a37bSArne Jansen { 44190b246afaSJeff Mahoney struct inode *inode = file_inode(file); 44200b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 44215d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 44225d13a37bSArne Jansen struct btrfs_trans_handle *trans; 44235d13a37bSArne Jansen int ret; 44245d13a37bSArne Jansen int err; 44255d13a37bSArne Jansen u64 qgroupid; 44265d13a37bSArne Jansen 44275d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 44285d13a37bSArne Jansen return -EPERM; 44295d13a37bSArne Jansen 4430905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4431905b0ddaSMiao Xie if (ret) 4432905b0ddaSMiao Xie return ret; 44335d13a37bSArne Jansen 44345d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4435905b0ddaSMiao Xie if (IS_ERR(sa)) { 4436905b0ddaSMiao Xie ret = PTR_ERR(sa); 4437905b0ddaSMiao Xie goto drop_write; 4438905b0ddaSMiao Xie } 44395d13a37bSArne Jansen 44405d13a37bSArne Jansen trans = btrfs_join_transaction(root); 44415d13a37bSArne Jansen if (IS_ERR(trans)) { 44425d13a37bSArne Jansen ret = PTR_ERR(trans); 44435d13a37bSArne Jansen goto out; 44445d13a37bSArne Jansen } 44455d13a37bSArne Jansen 44465d13a37bSArne Jansen qgroupid = sa->qgroupid; 44475d13a37bSArne Jansen if (!qgroupid) { 44485d13a37bSArne Jansen /* take the current subvol as qgroup */ 44495d13a37bSArne Jansen qgroupid = root->root_key.objectid; 44505d13a37bSArne Jansen } 44515d13a37bSArne Jansen 4452f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 44535d13a37bSArne Jansen 44543a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 44555d13a37bSArne Jansen if (err && !ret) 44565d13a37bSArne Jansen ret = err; 44575d13a37bSArne Jansen 44585d13a37bSArne Jansen out: 44595d13a37bSArne Jansen kfree(sa); 4460905b0ddaSMiao Xie drop_write: 4461905b0ddaSMiao Xie mnt_drop_write_file(file); 44625d13a37bSArne Jansen return ret; 44635d13a37bSArne Jansen } 44645d13a37bSArne Jansen 44652f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 44662f232036SJan Schmidt { 44670b246afaSJeff Mahoney struct inode *inode = file_inode(file); 44680b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 44692f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 44702f232036SJan Schmidt int ret; 44712f232036SJan Schmidt 44722f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 44732f232036SJan Schmidt return -EPERM; 44742f232036SJan Schmidt 44752f232036SJan Schmidt ret = mnt_want_write_file(file); 44762f232036SJan Schmidt if (ret) 44772f232036SJan Schmidt return ret; 44782f232036SJan Schmidt 44792f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 44802f232036SJan Schmidt if (IS_ERR(qsa)) { 44812f232036SJan Schmidt ret = PTR_ERR(qsa); 44822f232036SJan Schmidt goto drop_write; 44832f232036SJan Schmidt } 44842f232036SJan Schmidt 44852f232036SJan Schmidt if (qsa->flags) { 44862f232036SJan Schmidt ret = -EINVAL; 44872f232036SJan Schmidt goto out; 44882f232036SJan Schmidt } 44892f232036SJan Schmidt 44900b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 44912f232036SJan Schmidt 44922f232036SJan Schmidt out: 44932f232036SJan Schmidt kfree(qsa); 44942f232036SJan Schmidt drop_write: 44952f232036SJan Schmidt mnt_drop_write_file(file); 44962f232036SJan Schmidt return ret; 44972f232036SJan Schmidt } 44982f232036SJan Schmidt 4499b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4500b929c1d8SMarcos Paulo de Souza void __user *arg) 45012f232036SJan Schmidt { 45020afb603aSGoldwyn Rodrigues struct btrfs_ioctl_quota_rescan_args qsa = {0}; 45032f232036SJan Schmidt 45042f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 45052f232036SJan Schmidt return -EPERM; 45062f232036SJan Schmidt 45070b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 45080afb603aSGoldwyn Rodrigues qsa.flags = 1; 45090afb603aSGoldwyn Rodrigues qsa.progress = fs_info->qgroup_rescan_progress.objectid; 45102f232036SJan Schmidt } 45112f232036SJan Schmidt 45120afb603aSGoldwyn Rodrigues if (copy_to_user(arg, &qsa, sizeof(qsa))) 4513991a3daeSAnand Jain return -EFAULT; 45142f232036SJan Schmidt 4515991a3daeSAnand Jain return 0; 45162f232036SJan Schmidt } 45172f232036SJan Schmidt 4518b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4519b929c1d8SMarcos Paulo de Souza void __user *arg) 452057254b6eSJan Schmidt { 452157254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 452257254b6eSJan Schmidt return -EPERM; 452357254b6eSJan Schmidt 45240b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 452557254b6eSJan Schmidt } 452657254b6eSJan Schmidt 4527abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4528e4fed17aSChristian Brauner struct user_namespace *mnt_userns, 4529abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 45308ea05e3aSAlexander Block { 4531496ad9aaSAl Viro struct inode *inode = file_inode(file); 45320b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45338ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 45348ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 45358ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 453695582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 45378ea05e3aSAlexander Block int ret = 0; 4538dd5f9615SStefan Behrens int received_uuid_changed; 45398ea05e3aSAlexander Block 4540e4fed17aSChristian Brauner if (!inode_owner_or_capable(mnt_userns, inode)) 4541bd60ea0fSDavid Sterba return -EPERM; 4542bd60ea0fSDavid Sterba 45438ea05e3aSAlexander Block ret = mnt_want_write_file(file); 45448ea05e3aSAlexander Block if (ret < 0) 45458ea05e3aSAlexander Block return ret; 45468ea05e3aSAlexander Block 45470b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 45488ea05e3aSAlexander Block 45494a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 45508ea05e3aSAlexander Block ret = -EINVAL; 45518ea05e3aSAlexander Block goto out; 45528ea05e3aSAlexander Block } 45538ea05e3aSAlexander Block 45548ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 45558ea05e3aSAlexander Block ret = -EROFS; 45568ea05e3aSAlexander Block goto out; 45578ea05e3aSAlexander Block } 45588ea05e3aSAlexander Block 4559dd5f9615SStefan Behrens /* 4560dd5f9615SStefan Behrens * 1 - root item 4561dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4562dd5f9615SStefan Behrens */ 4563dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 45648ea05e3aSAlexander Block if (IS_ERR(trans)) { 45658ea05e3aSAlexander Block ret = PTR_ERR(trans); 45668ea05e3aSAlexander Block trans = NULL; 45678ea05e3aSAlexander Block goto out; 45688ea05e3aSAlexander Block } 45698ea05e3aSAlexander Block 45708ea05e3aSAlexander Block sa->rtransid = trans->transid; 45718ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 45728ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 45738ea05e3aSAlexander Block 4574dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4575dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4576dd5f9615SStefan Behrens if (received_uuid_changed && 4577d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4578d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4579dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4580dd5f9615SStefan Behrens root->root_key.objectid); 4581d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4582d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4583d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4584d87ff758SNikolay Borisov goto out; 4585d87ff758SNikolay Borisov } 4586d87ff758SNikolay Borisov } 45878ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 45888ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 45898ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 45903cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 45913cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 45923cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 45933cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 45948ea05e3aSAlexander Block 45950b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 45968ea05e3aSAlexander Block &root->root_key, &root->root_item); 45978ea05e3aSAlexander Block if (ret < 0) { 45983a45bb20SJeff Mahoney btrfs_end_transaction(trans); 45998ea05e3aSAlexander Block goto out; 4600dd5f9615SStefan Behrens } 4601dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4602cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4603dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4604dd5f9615SStefan Behrens root->root_key.objectid); 4605dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 460666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4607efd38150SNikolay Borisov btrfs_end_transaction(trans); 4608dd5f9615SStefan Behrens goto out; 4609dd5f9615SStefan Behrens } 4610dd5f9615SStefan Behrens } 46113a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4612abccd00fSHugo Mills out: 46130b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4614abccd00fSHugo Mills mnt_drop_write_file(file); 4615abccd00fSHugo Mills return ret; 4616abccd00fSHugo Mills } 4617abccd00fSHugo Mills 4618abccd00fSHugo Mills #ifdef CONFIG_64BIT 4619abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4620abccd00fSHugo Mills void __user *arg) 4621abccd00fSHugo Mills { 4622abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4623abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4624abccd00fSHugo Mills int ret = 0; 4625abccd00fSHugo Mills 4626abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 46277b9ea627SShailendra Verma if (IS_ERR(args32)) 46287b9ea627SShailendra Verma return PTR_ERR(args32); 4629abccd00fSHugo Mills 46308d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 463184dbeb87SDan Carpenter if (!args64) { 463284dbeb87SDan Carpenter ret = -ENOMEM; 4633abccd00fSHugo Mills goto out; 4634abccd00fSHugo Mills } 4635abccd00fSHugo Mills 4636abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4637abccd00fSHugo Mills args64->stransid = args32->stransid; 4638abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4639abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4640abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4641abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4642abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4643abccd00fSHugo Mills args64->flags = args32->flags; 4644abccd00fSHugo Mills 4645e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), args64); 4646abccd00fSHugo Mills if (ret) 4647abccd00fSHugo Mills goto out; 4648abccd00fSHugo Mills 4649abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4650abccd00fSHugo Mills args32->stransid = args64->stransid; 4651abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4652abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4653abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4654abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4655abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4656abccd00fSHugo Mills args32->flags = args64->flags; 4657abccd00fSHugo Mills 4658abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4659abccd00fSHugo Mills if (ret) 4660abccd00fSHugo Mills ret = -EFAULT; 4661abccd00fSHugo Mills 4662abccd00fSHugo Mills out: 4663abccd00fSHugo Mills kfree(args32); 4664abccd00fSHugo Mills kfree(args64); 4665abccd00fSHugo Mills return ret; 4666abccd00fSHugo Mills } 4667abccd00fSHugo Mills #endif 4668abccd00fSHugo Mills 4669abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4670abccd00fSHugo Mills void __user *arg) 4671abccd00fSHugo Mills { 4672abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4673abccd00fSHugo Mills int ret = 0; 4674abccd00fSHugo Mills 4675abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 46767b9ea627SShailendra Verma if (IS_ERR(sa)) 46777b9ea627SShailendra Verma return PTR_ERR(sa); 4678abccd00fSHugo Mills 4679e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), sa); 4680abccd00fSHugo Mills 4681abccd00fSHugo Mills if (ret) 4682abccd00fSHugo Mills goto out; 4683abccd00fSHugo Mills 46848ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 46858ea05e3aSAlexander Block if (ret) 46868ea05e3aSAlexander Block ret = -EFAULT; 46878ea05e3aSAlexander Block 46888ea05e3aSAlexander Block out: 46898ea05e3aSAlexander Block kfree(sa); 46908ea05e3aSAlexander Block return ret; 46918ea05e3aSAlexander Block } 46928ea05e3aSAlexander Block 4693b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4694b929c1d8SMarcos Paulo de Souza void __user *arg) 4695867ab667Sjeff.liu { 4696a1b83ac5SAnand Jain size_t len; 4697867ab667Sjeff.liu int ret; 4698a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4699a1b83ac5SAnand Jain 47000b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 47010b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 47020b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4703a1b83ac5SAnand Jain 4704a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4705867ab667Sjeff.liu 4706867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 47070b246afaSJeff Mahoney btrfs_warn(fs_info, 47080b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 47090b246afaSJeff Mahoney --len); 4710867ab667Sjeff.liu } 4711867ab667Sjeff.liu 4712867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4713867ab667Sjeff.liu 4714867ab667Sjeff.liu return ret ? -EFAULT : 0; 4715867ab667Sjeff.liu } 4716867ab667Sjeff.liu 4717a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4718a8bfd4abSjeff.liu { 47190b246afaSJeff Mahoney struct inode *inode = file_inode(file); 47200b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 47210b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 47220b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4723a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4724a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4725a8bfd4abSjeff.liu int ret; 4726a8bfd4abSjeff.liu 4727a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4728a8bfd4abSjeff.liu return -EPERM; 4729a8bfd4abSjeff.liu 4730a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4731a8bfd4abSjeff.liu return -EFAULT; 4732a8bfd4abSjeff.liu 4733a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 47340b246afaSJeff Mahoney btrfs_err(fs_info, 47355d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4736a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4737a8bfd4abSjeff.liu return -EINVAL; 4738a8bfd4abSjeff.liu } 4739a8bfd4abSjeff.liu 4740a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4741a8bfd4abSjeff.liu if (ret) 4742a8bfd4abSjeff.liu return ret; 4743a8bfd4abSjeff.liu 4744a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4745a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4746a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4747a8bfd4abSjeff.liu goto out_unlock; 4748a8bfd4abSjeff.liu } 4749a8bfd4abSjeff.liu 47500b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4751a8bfd4abSjeff.liu strcpy(super_block->label, label); 47520b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 47533a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4754a8bfd4abSjeff.liu 4755a8bfd4abSjeff.liu out_unlock: 4756a8bfd4abSjeff.liu mnt_drop_write_file(file); 4757a8bfd4abSjeff.liu return ret; 4758a8bfd4abSjeff.liu } 4759a8bfd4abSjeff.liu 47602eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 47612eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 47622eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 47632eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 47642eaa055fSJeff Mahoney 4765d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 47662eaa055fSJeff Mahoney { 47674d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 47682eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 47692eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 47702eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 47712eaa055fSJeff Mahoney }; 47722eaa055fSJeff Mahoney 47732eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 47742eaa055fSJeff Mahoney return -EFAULT; 47752eaa055fSJeff Mahoney 47762eaa055fSJeff Mahoney return 0; 47772eaa055fSJeff Mahoney } 47782eaa055fSJeff Mahoney 4779b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4780b929c1d8SMarcos Paulo de Souza void __user *arg) 47812eaa055fSJeff Mahoney { 47820b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 47832eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 47842eaa055fSJeff Mahoney 47852eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 47862eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 47872eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 47882eaa055fSJeff Mahoney 47892eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 47902eaa055fSJeff Mahoney return -EFAULT; 47912eaa055fSJeff Mahoney 47922eaa055fSJeff Mahoney return 0; 47932eaa055fSJeff Mahoney } 47942eaa055fSJeff Mahoney 47952ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 47963b02a68aSJeff Mahoney enum btrfs_feature_set set, 47972eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 47982eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 47992eaa055fSJeff Mahoney { 4800f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 48013b02a68aSJeff Mahoney char *names; 48022eaa055fSJeff Mahoney u64 disallowed, unsupported; 48032eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 48042eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 48052eaa055fSJeff Mahoney 48062eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 48072eaa055fSJeff Mahoney if (unsupported) { 48083b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 48093b02a68aSJeff Mahoney if (names) { 48100b246afaSJeff Mahoney btrfs_warn(fs_info, 48113b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 48123b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 48133b02a68aSJeff Mahoney kfree(names); 48143b02a68aSJeff Mahoney } else 48150b246afaSJeff Mahoney btrfs_warn(fs_info, 48162eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 48172eaa055fSJeff Mahoney type, unsupported); 48182eaa055fSJeff Mahoney return -EOPNOTSUPP; 48192eaa055fSJeff Mahoney } 48202eaa055fSJeff Mahoney 48212eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 48222eaa055fSJeff Mahoney if (disallowed) { 48233b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 48243b02a68aSJeff Mahoney if (names) { 48250b246afaSJeff Mahoney btrfs_warn(fs_info, 48263b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 48273b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 48283b02a68aSJeff Mahoney kfree(names); 48293b02a68aSJeff Mahoney } else 48300b246afaSJeff Mahoney btrfs_warn(fs_info, 48312eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 48322eaa055fSJeff Mahoney type, disallowed); 48332eaa055fSJeff Mahoney return -EPERM; 48342eaa055fSJeff Mahoney } 48352eaa055fSJeff Mahoney 48362eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 48372eaa055fSJeff Mahoney if (disallowed) { 48383b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 48393b02a68aSJeff Mahoney if (names) { 48400b246afaSJeff Mahoney btrfs_warn(fs_info, 48413b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 48423b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 48433b02a68aSJeff Mahoney kfree(names); 48443b02a68aSJeff Mahoney } else 48450b246afaSJeff Mahoney btrfs_warn(fs_info, 48462eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 48472eaa055fSJeff Mahoney type, disallowed); 48482eaa055fSJeff Mahoney return -EPERM; 48492eaa055fSJeff Mahoney } 48502eaa055fSJeff Mahoney 48512eaa055fSJeff Mahoney return 0; 48522eaa055fSJeff Mahoney } 48532eaa055fSJeff Mahoney 48542ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 48552ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 48562eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 48572eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 48582eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 48592eaa055fSJeff Mahoney 48602eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 48612eaa055fSJeff Mahoney { 48620b246afaSJeff Mahoney struct inode *inode = file_inode(file); 48630b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 48640b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 48650b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 48662eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 48672eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 48682eaa055fSJeff Mahoney u64 newflags; 48692eaa055fSJeff Mahoney int ret; 48702eaa055fSJeff Mahoney 48712eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 48722eaa055fSJeff Mahoney return -EPERM; 48732eaa055fSJeff Mahoney 48742eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 48752eaa055fSJeff Mahoney return -EFAULT; 48762eaa055fSJeff Mahoney 48772eaa055fSJeff Mahoney /* Nothing to do */ 48782eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 48792eaa055fSJeff Mahoney !flags[0].incompat_flags) 48802eaa055fSJeff Mahoney return 0; 48812eaa055fSJeff Mahoney 48822ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 48832eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 48842eaa055fSJeff Mahoney if (ret) 48852eaa055fSJeff Mahoney return ret; 48862eaa055fSJeff Mahoney 48872ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 48882eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 48892eaa055fSJeff Mahoney if (ret) 48902eaa055fSJeff Mahoney return ret; 48912eaa055fSJeff Mahoney 48922ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 48932eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 48942eaa055fSJeff Mahoney if (ret) 48952eaa055fSJeff Mahoney return ret; 48962eaa055fSJeff Mahoney 48977ab19625SDavid Sterba ret = mnt_want_write_file(file); 48987ab19625SDavid Sterba if (ret) 48997ab19625SDavid Sterba return ret; 49007ab19625SDavid Sterba 49018051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 49027ab19625SDavid Sterba if (IS_ERR(trans)) { 49037ab19625SDavid Sterba ret = PTR_ERR(trans); 49047ab19625SDavid Sterba goto out_drop_write; 49057ab19625SDavid Sterba } 49062eaa055fSJeff Mahoney 49070b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 49082eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 49092eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 49102eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 49112eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 49122eaa055fSJeff Mahoney 49132eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 49142eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 49152eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 49162eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 49172eaa055fSJeff Mahoney 49182eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 49192eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 49202eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 49212eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 49220b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 49232eaa055fSJeff Mahoney 49243a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 49257ab19625SDavid Sterba out_drop_write: 49267ab19625SDavid Sterba mnt_drop_write_file(file); 49277ab19625SDavid Sterba 49287ab19625SDavid Sterba return ret; 49292eaa055fSJeff Mahoney } 49302eaa055fSJeff Mahoney 49312351f431SJosef Bacik static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) 49322351f431SJosef Bacik { 49332351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 49342351f431SJosef Bacik int ret; 49352351f431SJosef Bacik 49362351f431SJosef Bacik if (compat) { 49372351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 49382351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 49392351f431SJosef Bacik 49402351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 49412351f431SJosef Bacik if (ret) 49422351f431SJosef Bacik return -EFAULT; 49432351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 49442351f431SJosef Bacik if (!arg) 49452351f431SJosef Bacik return -ENOMEM; 49462351f431SJosef Bacik arg->send_fd = args32.send_fd; 49472351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 49482351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 49492351f431SJosef Bacik arg->parent_root = args32.parent_root; 49502351f431SJosef Bacik arg->flags = args32.flags; 49512351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 49522351f431SJosef Bacik sizeof(args32.reserved)); 49532351f431SJosef Bacik #else 49542351f431SJosef Bacik return -ENOTTY; 49552351f431SJosef Bacik #endif 49562351f431SJosef Bacik } else { 49572351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 49582351f431SJosef Bacik if (IS_ERR(arg)) 49592351f431SJosef Bacik return PTR_ERR(arg); 49602351f431SJosef Bacik } 49612351f431SJosef Bacik ret = btrfs_ioctl_send(file, arg); 49622351f431SJosef Bacik kfree(arg); 49632351f431SJosef Bacik return ret; 49642351f431SJosef Bacik } 49652351f431SJosef Bacik 4966f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4967f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4968f46b5a66SChristoph Hellwig { 49690b246afaSJeff Mahoney struct inode *inode = file_inode(file); 49700b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 49710b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 49724bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4973f46b5a66SChristoph Hellwig 4974f46b5a66SChristoph Hellwig switch (cmd) { 49756cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 49766cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 497740cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4978b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 497940cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 498040cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4981f7039b1dSLi Dongyang case FITRIM: 4982b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4983f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4984fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4985fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4986fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 49873de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4988fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 49896f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 49906f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 499176dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4992949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4993949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4994949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 49950caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 49960caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 49970caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 49980caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 49996ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 50006ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 5001f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 50021e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 50031e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 50041e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 5005f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 5006198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 5007f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 50082ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 5009f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 5010da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 50116b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 50126b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 5013475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 50142ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 5015475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 50162ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 5017f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 50189ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 5019ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 5020ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 5021cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 5022cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 5023ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 5024ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 5025d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 5026d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 5027d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 5028d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 5029d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 5030d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 50311406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 50322ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 50339b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 50349b199859SFilipe David Borba Manana int ret; 50359b199859SFilipe David Borba Manana 50369db4dc24SNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 50379b199859SFilipe David Borba Manana if (ret) 50389b199859SFilipe David Borba Manana return ret; 50390b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 50402fad4e83SDavid Sterba /* 50412fad4e83SDavid Sterba * The transaction thread may want to do more work, 504201327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 50432fad4e83SDavid Sterba * processing uncleaned subvols. 50442fad4e83SDavid Sterba */ 50450b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 50469b199859SFilipe David Borba Manana return ret; 50479b199859SFilipe David Borba Manana } 504846204592SSage Weil case BTRFS_IOC_START_SYNC: 50499a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 505046204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 50512ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 5052475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 5053b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 5054475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 50552ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 5056475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 50572ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 5058c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 50599ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 5060837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 50612ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 506219a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 50632ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 50648ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 50658ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 5066abccd00fSHugo Mills #ifdef CONFIG_64BIT 5067abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 5068abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 5069abccd00fSHugo Mills #endif 507031db9f7cSAlexander Block case BTRFS_IOC_SEND: 50712351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, false); 50722351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 50732351f431SJosef Bacik case BTRFS_IOC_SEND_32: 50742351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, true); 50752351f431SJosef Bacik #endif 5076c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 50772ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 50785d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5079905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 50805d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5081905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 50825d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5083905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 50845d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5085905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 50862f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 50872f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 50882f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 5089b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 509057254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 5091b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 50923f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 50932ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 50942eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 5095d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 50962eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 5097b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 50982eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 50992eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5100b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 5101b64ec075STomohiro Misono return btrfs_ioctl_get_subvol_info(file, argp); 510242e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 510342e4b520STomohiro Misono return btrfs_ioctl_get_subvol_rootref(file, argp); 510423d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 510523d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 510614605409SBoris Burkov case FS_IOC_ENABLE_VERITY: 510714605409SBoris Burkov return fsverity_ioctl_enable(file, (const void __user *)argp); 510814605409SBoris Burkov case FS_IOC_MEASURE_VERITY: 510914605409SBoris Burkov return fsverity_ioctl_measure(file, argp); 5110f46b5a66SChristoph Hellwig } 5111f46b5a66SChristoph Hellwig 5112f46b5a66SChristoph Hellwig return -ENOTTY; 5113f46b5a66SChristoph Hellwig } 51144c63c245SLuke Dashjr 51154c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 51164c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 51174c63c245SLuke Dashjr { 51182a362249SJeff Mahoney /* 51192a362249SJeff Mahoney * These all access 32-bit values anyway so no further 51202a362249SJeff Mahoney * handling is necessary. 51212a362249SJeff Mahoney */ 51224c63c245SLuke Dashjr switch (cmd) { 51234c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 51244c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 51254c63c245SLuke Dashjr break; 51264c63c245SLuke Dashjr } 51274c63c245SLuke Dashjr 51284c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 51294c63c245SLuke Dashjr } 51304c63c245SLuke Dashjr #endif 5131