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" 51*22b398eeSQu 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 */ 852351f431SJosef Bacik __u64 reserved[4]; /* in */ 862351f431SJosef Bacik } __attribute__ ((__packed__)); 872351f431SJosef Bacik 882351f431SJosef Bacik #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \ 892351f431SJosef Bacik struct btrfs_ioctl_send_args_32) 902351f431SJosef Bacik #endif 91abccd00fSHugo Mills 926cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 931905a0f7SDavid Sterba static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode, 941905a0f7SDavid Sterba unsigned int flags) 956cbff00fSChristoph Hellwig { 961905a0f7SDavid Sterba if (S_ISDIR(inode->i_mode)) 976cbff00fSChristoph Hellwig return flags; 981905a0f7SDavid Sterba else if (S_ISREG(inode->i_mode)) 996cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 1006cbff00fSChristoph Hellwig else 1016cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 1026cbff00fSChristoph Hellwig } 103f46b5a66SChristoph Hellwig 1046cbff00fSChristoph Hellwig /* 105a157d4fdSDavid Sterba * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS 106a157d4fdSDavid Sterba * ioctl. 1076cbff00fSChristoph Hellwig */ 10877eea05eSBoris Burkov static unsigned int btrfs_inode_flags_to_fsflags(struct btrfs_inode *binode) 1096cbff00fSChristoph Hellwig { 1106cbff00fSChristoph Hellwig unsigned int iflags = 0; 11177eea05eSBoris Burkov u32 flags = binode->flags; 11214605409SBoris Burkov u32 ro_flags = binode->ro_flags; 1136cbff00fSChristoph Hellwig 1146cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 1156cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 1166cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 1176cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 1186cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 1196cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 1206cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 1216cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 1226cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 1236cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 1246cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 1256cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 126d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 127d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 12814605409SBoris Burkov if (ro_flags & BTRFS_INODE_RO_VERITY) 12914605409SBoris Burkov iflags |= FS_VERITY_FL; 130d0092bddSLi Zefan 13113f48dc9SSatoru Takeuchi if (flags & BTRFS_INODE_NOCOMPRESS) 132d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 13313f48dc9SSatoru Takeuchi else if (flags & BTRFS_INODE_COMPRESS) 13413f48dc9SSatoru Takeuchi iflags |= FS_COMPR_FL; 1356cbff00fSChristoph Hellwig 1366cbff00fSChristoph Hellwig return iflags; 1376cbff00fSChristoph Hellwig } 1386cbff00fSChristoph Hellwig 1396cbff00fSChristoph Hellwig /* 1406cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1416cbff00fSChristoph Hellwig */ 1427b6a221eSDavid Sterba void btrfs_sync_inode_flags_to_i_flags(struct inode *inode) 1436cbff00fSChristoph Hellwig { 1445c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 1453cc79392SFilipe Manana unsigned int new_fl = 0; 1466cbff00fSChristoph Hellwig 1475c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_SYNC) 1483cc79392SFilipe Manana new_fl |= S_SYNC; 1495c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_IMMUTABLE) 1503cc79392SFilipe Manana new_fl |= S_IMMUTABLE; 1515c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_APPEND) 1523cc79392SFilipe Manana new_fl |= S_APPEND; 1535c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_NOATIME) 1543cc79392SFilipe Manana new_fl |= S_NOATIME; 1555c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_DIRSYNC) 1563cc79392SFilipe Manana new_fl |= S_DIRSYNC; 15714605409SBoris Burkov if (binode->ro_flags & BTRFS_INODE_RO_VERITY) 15814605409SBoris Burkov new_fl |= S_VERITY; 1593cc79392SFilipe Manana 1603cc79392SFilipe Manana set_mask_bits(&inode->i_flags, 16114605409SBoris Burkov S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC | 16214605409SBoris Burkov S_VERITY, new_fl); 1636cbff00fSChristoph Hellwig } 1646cbff00fSChristoph Hellwig 165f37c563bSDavid Sterba /* 166f37c563bSDavid Sterba * Check if @flags are a supported and valid set of FS_*_FL flags and that 167f37c563bSDavid Sterba * the old and new flags are not conflicting 168f37c563bSDavid Sterba */ 169f37c563bSDavid Sterba static int check_fsflags(unsigned int old_flags, unsigned int flags) 17075e7cb7fSLiu Bo { 17175e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 17275e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 17375e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 174e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 175e1e8fb6aSLi Zefan FS_NOCOW_FL)) 17675e7cb7fSLiu Bo return -EOPNOTSUPP; 17775e7cb7fSLiu Bo 178f37c563bSDavid Sterba /* COMPR and NOCOMP on new/old are valid */ 17975e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 18075e7cb7fSLiu Bo return -EINVAL; 18175e7cb7fSLiu Bo 182f37c563bSDavid Sterba if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL)) 183f37c563bSDavid Sterba return -EINVAL; 184f37c563bSDavid Sterba 185f37c563bSDavid Sterba /* NOCOW and compression options are mutually exclusive */ 186f37c563bSDavid Sterba if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 187f37c563bSDavid Sterba return -EINVAL; 188f37c563bSDavid Sterba if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 189f37c563bSDavid Sterba return -EINVAL; 190f37c563bSDavid Sterba 19175e7cb7fSLiu Bo return 0; 19275e7cb7fSLiu Bo } 19375e7cb7fSLiu Bo 194d206e9c9SNaohiro Aota static int check_fsflags_compatible(struct btrfs_fs_info *fs_info, 195d206e9c9SNaohiro Aota unsigned int flags) 196d206e9c9SNaohiro Aota { 197d206e9c9SNaohiro Aota if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL)) 198d206e9c9SNaohiro Aota return -EPERM; 199d206e9c9SNaohiro Aota 200d206e9c9SNaohiro Aota return 0; 201d206e9c9SNaohiro Aota } 202d206e9c9SNaohiro Aota 20397fc2977SMiklos Szeredi /* 20497fc2977SMiklos Szeredi * Set flags/xflags from the internal inode flags. The remaining items of 20597fc2977SMiklos Szeredi * fsxattr are zeroed. 20697fc2977SMiklos Szeredi */ 20797fc2977SMiklos Szeredi int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa) 2086cbff00fSChristoph Hellwig { 20997fc2977SMiklos Szeredi struct btrfs_inode *binode = BTRFS_I(d_inode(dentry)); 21097fc2977SMiklos Szeredi 21177eea05eSBoris Burkov fileattr_fill_flags(fa, btrfs_inode_flags_to_fsflags(binode)); 21297fc2977SMiklos Szeredi return 0; 21397fc2977SMiklos Szeredi } 21497fc2977SMiklos Szeredi 21597fc2977SMiklos Szeredi int btrfs_fileattr_set(struct user_namespace *mnt_userns, 21697fc2977SMiklos Szeredi struct dentry *dentry, struct fileattr *fa) 21797fc2977SMiklos Szeredi { 21897fc2977SMiklos Szeredi struct inode *inode = d_inode(dentry); 2190b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 2205c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 2215c57b8b6SDavid Sterba struct btrfs_root *root = binode->root; 2226cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 2235aca2842SDarrick J. Wong unsigned int fsflags, old_fsflags; 2246cbff00fSChristoph Hellwig int ret; 225ff9fef55SAnand Jain const char *comp = NULL; 226f37c563bSDavid Sterba u32 binode_flags; 2276cbff00fSChristoph Hellwig 228b83cc969SLi Zefan if (btrfs_root_readonly(root)) 229b83cc969SLi Zefan return -EROFS; 230b83cc969SLi Zefan 23197fc2977SMiklos Szeredi if (fileattr_has_fsx(fa)) 23297fc2977SMiklos Szeredi return -EOPNOTSUPP; 2336cbff00fSChristoph Hellwig 23497fc2977SMiklos Szeredi fsflags = btrfs_mask_fsflags_for_type(inode, fa->flags); 23577eea05eSBoris Burkov old_fsflags = btrfs_inode_flags_to_fsflags(binode); 23697fc2977SMiklos Szeredi ret = check_fsflags(old_fsflags, fsflags); 237e7848683SJan Kara if (ret) 238e7848683SJan Kara return ret; 239e7848683SJan Kara 240d206e9c9SNaohiro Aota ret = check_fsflags_compatible(fs_info, fsflags); 241d206e9c9SNaohiro Aota if (ret) 24297fc2977SMiklos Szeredi return ret; 243d206e9c9SNaohiro Aota 244f37c563bSDavid Sterba binode_flags = binode->flags; 2455c57b8b6SDavid Sterba if (fsflags & FS_SYNC_FL) 246d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_SYNC; 2476cbff00fSChristoph Hellwig else 248d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_SYNC; 2495c57b8b6SDavid Sterba if (fsflags & FS_IMMUTABLE_FL) 250d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_IMMUTABLE; 2516cbff00fSChristoph Hellwig else 252d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_IMMUTABLE; 2535c57b8b6SDavid Sterba if (fsflags & FS_APPEND_FL) 254d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_APPEND; 2556cbff00fSChristoph Hellwig else 256d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_APPEND; 2575c57b8b6SDavid Sterba if (fsflags & FS_NODUMP_FL) 258d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODUMP; 2596cbff00fSChristoph Hellwig else 260d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODUMP; 2615c57b8b6SDavid Sterba if (fsflags & FS_NOATIME_FL) 262d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOATIME; 2636cbff00fSChristoph Hellwig else 264d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOATIME; 26597fc2977SMiklos Szeredi 26697fc2977SMiklos Szeredi /* If coming from FS_IOC_FSSETXATTR then skip unconverted flags */ 26797fc2977SMiklos Szeredi if (!fa->flags_valid) { 26897fc2977SMiklos Szeredi /* 1 item for the inode */ 26997fc2977SMiklos Szeredi trans = btrfs_start_transaction(root, 1); 2709b8a233bSRitesh Harjani if (IS_ERR(trans)) 2719b8a233bSRitesh Harjani return PTR_ERR(trans); 27297fc2977SMiklos Szeredi goto update_flags; 27397fc2977SMiklos Szeredi } 27497fc2977SMiklos Szeredi 2755c57b8b6SDavid Sterba if (fsflags & FS_DIRSYNC_FL) 276d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_DIRSYNC; 2776cbff00fSChristoph Hellwig else 278d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_DIRSYNC; 2795c57b8b6SDavid Sterba if (fsflags & FS_NOCOW_FL) { 28044e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 2817e97b8daSDavid Sterba /* 2827e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2837e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2847e97b8daSDavid Sterba * status of the file and will not set it. 2857e97b8daSDavid Sterba */ 2867e97b8daSDavid Sterba if (inode->i_size == 0) 287d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW | 288d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM; 2897e97b8daSDavid Sterba } else { 290d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW; 2917e97b8daSDavid Sterba } 2927e97b8daSDavid Sterba } else { 2937e97b8daSDavid Sterba /* 29401327610SNicholas D Steeves * Revert back under same assumptions as above 2957e97b8daSDavid Sterba */ 29644e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 2977e97b8daSDavid Sterba if (inode->i_size == 0) 298d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_NODATACOW | 299d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM); 3007e97b8daSDavid Sterba } else { 301d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODATACOW; 3027e97b8daSDavid Sterba } 3037e97b8daSDavid Sterba } 3046cbff00fSChristoph Hellwig 30575e7cb7fSLiu Bo /* 30675e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 30775e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 30875e7cb7fSLiu Bo * things smaller. 30975e7cb7fSLiu Bo */ 3105c57b8b6SDavid Sterba if (fsflags & FS_NOCOMP_FL) { 311d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_COMPRESS; 312d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOCOMPRESS; 3135c57b8b6SDavid Sterba } else if (fsflags & FS_COMPR_FL) { 31463541927SFilipe David Borba Manana 31597fc2977SMiklos Szeredi if (IS_SWAPFILE(inode)) 31697fc2977SMiklos Szeredi return -ETXTBSY; 317eede2bf3SOmar Sandoval 318d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_COMPRESS; 319d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOCOMPRESS; 32063541927SFilipe David Borba Manana 32193370509SDavid Sterba comp = btrfs_compress_type2str(fs_info->compress_type); 32293370509SDavid Sterba if (!comp || comp[0] == 0) 32393370509SDavid Sterba comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB); 324ebcb904dSLi Zefan } else { 325d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 32675e7cb7fSLiu Bo } 3276cbff00fSChristoph Hellwig 328ff9fef55SAnand Jain /* 329ff9fef55SAnand Jain * 1 for inode item 330ff9fef55SAnand Jain * 2 for properties 331ff9fef55SAnand Jain */ 332ff9fef55SAnand Jain trans = btrfs_start_transaction(root, 3); 33397fc2977SMiklos Szeredi if (IS_ERR(trans)) 33497fc2977SMiklos Szeredi return PTR_ERR(trans); 3356cbff00fSChristoph Hellwig 336ff9fef55SAnand Jain if (comp) { 337ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp, 338ff9fef55SAnand Jain strlen(comp), 0); 339ff9fef55SAnand Jain if (ret) { 340ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 341ff9fef55SAnand Jain goto out_end_trans; 342ff9fef55SAnand Jain } 343ff9fef55SAnand Jain } else { 344ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL, 345ff9fef55SAnand Jain 0, 0); 346ff9fef55SAnand Jain if (ret && ret != -ENODATA) { 347ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 348ff9fef55SAnand Jain goto out_end_trans; 349ff9fef55SAnand Jain } 350ff9fef55SAnand Jain } 351ff9fef55SAnand Jain 35297fc2977SMiklos Szeredi update_flags: 353d2b8fcfeSAnand Jain binode->flags = binode_flags; 3547b6a221eSDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 3550c4d2d95SJosef Bacik inode_inc_iversion(inode); 356c2050a45SDeepa Dinamani inode->i_ctime = current_time(inode); 3579a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); 3586cbff00fSChristoph Hellwig 359ff9fef55SAnand Jain out_end_trans: 3603a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3612d4e6f6aSliubo return ret; 3626cbff00fSChristoph Hellwig } 3636cbff00fSChristoph Hellwig 3640d7ed32cSDavid Sterba /* 3650d7ed32cSDavid Sterba * Start exclusive operation @type, return true on success 3660d7ed32cSDavid Sterba */ 367c3e1f96cSGoldwyn Rodrigues bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, 368c3e1f96cSGoldwyn Rodrigues enum btrfs_exclusive_operation type) 369c3e1f96cSGoldwyn Rodrigues { 3700d7ed32cSDavid Sterba bool ret = false; 3710d7ed32cSDavid Sterba 3720d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 3730d7ed32cSDavid Sterba if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) { 3740d7ed32cSDavid Sterba fs_info->exclusive_operation = type; 3750d7ed32cSDavid Sterba ret = true; 3760d7ed32cSDavid Sterba } 3770d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 3780d7ed32cSDavid Sterba 3790d7ed32cSDavid Sterba return ret; 380c3e1f96cSGoldwyn Rodrigues } 381c3e1f96cSGoldwyn Rodrigues 382578bda9eSDavid Sterba /* 383578bda9eSDavid Sterba * Conditionally allow to enter the exclusive operation in case it's compatible 384578bda9eSDavid Sterba * with the running one. This must be paired with btrfs_exclop_start_unlock and 385578bda9eSDavid Sterba * btrfs_exclop_finish. 386578bda9eSDavid Sterba * 387578bda9eSDavid Sterba * Compatibility: 388578bda9eSDavid Sterba * - the same type is already running 389578bda9eSDavid Sterba * - not BTRFS_EXCLOP_NONE - this is intentionally incompatible and the caller 390578bda9eSDavid Sterba * must check the condition first that would allow none -> @type 391578bda9eSDavid Sterba */ 392578bda9eSDavid Sterba bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info, 393578bda9eSDavid Sterba enum btrfs_exclusive_operation type) 394578bda9eSDavid Sterba { 395578bda9eSDavid Sterba spin_lock(&fs_info->super_lock); 396578bda9eSDavid Sterba if (fs_info->exclusive_operation == type) 397578bda9eSDavid Sterba return true; 398578bda9eSDavid Sterba 399578bda9eSDavid Sterba spin_unlock(&fs_info->super_lock); 400578bda9eSDavid Sterba return false; 401578bda9eSDavid Sterba } 402578bda9eSDavid Sterba 403578bda9eSDavid Sterba void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info) 404578bda9eSDavid Sterba { 405578bda9eSDavid Sterba spin_unlock(&fs_info->super_lock); 406578bda9eSDavid Sterba } 407578bda9eSDavid Sterba 408c3e1f96cSGoldwyn Rodrigues void btrfs_exclop_finish(struct btrfs_fs_info *fs_info) 409c3e1f96cSGoldwyn Rodrigues { 4100d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 411c3e1f96cSGoldwyn Rodrigues WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE); 4120d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 41366a2823cSGoldwyn Rodrigues sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation"); 414c3e1f96cSGoldwyn Rodrigues } 415c3e1f96cSGoldwyn Rodrigues 4166cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 4176cbff00fSChristoph Hellwig { 418496ad9aaSAl Viro struct inode *inode = file_inode(file); 4196cbff00fSChristoph Hellwig 4206cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 4216cbff00fSChristoph Hellwig } 422f46b5a66SChristoph Hellwig 423b929c1d8SMarcos Paulo de Souza static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, 424b929c1d8SMarcos Paulo de Souza void __user *arg) 425f7039b1dSLi Dongyang { 426f7039b1dSLi Dongyang struct btrfs_device *device; 427f7039b1dSLi Dongyang struct request_queue *q; 428f7039b1dSLi Dongyang struct fstrim_range range; 429f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 430f7039b1dSLi Dongyang u64 num_devices = 0; 431f7039b1dSLi Dongyang int ret; 432f7039b1dSLi Dongyang 433f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 434f7039b1dSLi Dongyang return -EPERM; 435f7039b1dSLi Dongyang 436f35f06c3SFilipe Manana /* 4371cb3dc3fSNaohiro Aota * btrfs_trim_block_group() depends on space cache, which is not 4381cb3dc3fSNaohiro Aota * available in zoned filesystem. So, disallow fitrim on a zoned 4391cb3dc3fSNaohiro Aota * filesystem for now. 4401cb3dc3fSNaohiro Aota */ 4411cb3dc3fSNaohiro Aota if (btrfs_is_zoned(fs_info)) 4421cb3dc3fSNaohiro Aota return -EOPNOTSUPP; 4431cb3dc3fSNaohiro Aota 4441cb3dc3fSNaohiro Aota /* 445f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 446f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 447f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 448f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 449f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 450f35f06c3SFilipe Manana */ 451f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 452f35f06c3SFilipe Manana return -EROFS; 453f35f06c3SFilipe Manana 4541f78160cSXiao Guangrong rcu_read_lock(); 4551f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 4561f78160cSXiao Guangrong dev_list) { 457f7039b1dSLi Dongyang if (!device->bdev) 458f7039b1dSLi Dongyang continue; 459f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 460f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 461f7039b1dSLi Dongyang num_devices++; 46250d0446eSSeraphime Kirkovski minlen = min_t(u64, q->limits.discard_granularity, 463f7039b1dSLi Dongyang minlen); 464f7039b1dSLi Dongyang } 465f7039b1dSLi Dongyang } 4661f78160cSXiao Guangrong rcu_read_unlock(); 467f4c697e6SLukas Czerner 468f7039b1dSLi Dongyang if (!num_devices) 469f7039b1dSLi Dongyang return -EOPNOTSUPP; 470f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 471f7039b1dSLi Dongyang return -EFAULT; 4726ba9fc8eSQu Wenruo 4736ba9fc8eSQu Wenruo /* 4746ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 4756ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 4766ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 4776ba9fc8eSQu Wenruo */ 4786ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 479f4c697e6SLukas Czerner return -EINVAL; 480f7039b1dSLi Dongyang 481f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 4822ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 483f7039b1dSLi Dongyang if (ret < 0) 484f7039b1dSLi Dongyang return ret; 485f7039b1dSLi Dongyang 486f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 487f7039b1dSLi Dongyang return -EFAULT; 488f7039b1dSLi Dongyang 489f7039b1dSLi Dongyang return 0; 490f7039b1dSLi Dongyang } 491f7039b1dSLi Dongyang 492e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 493dd5f9615SStefan Behrens { 49446e0f66aSChris Mason int i; 49546e0f66aSChris Mason 49646e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 49746e0f66aSChris Mason if (uuid[i]) 49846e0f66aSChris Mason return 0; 49946e0f66aSChris Mason } 50046e0f66aSChris Mason return 1; 501dd5f9615SStefan Behrens } 502dd5f9615SStefan Behrens 5034d4340c9SChristian Brauner static noinline int create_subvol(struct user_namespace *mnt_userns, 5044d4340c9SChristian Brauner struct inode *dir, struct dentry *dentry, 50552f75f4fSDavid Sterba const char *name, int namelen, 5068696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 507f46b5a66SChristoph Hellwig { 5080b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 509f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 510f46b5a66SChristoph Hellwig struct btrfs_key key; 51149a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 512f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 513f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 514d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 51576dda93cSYan, Zheng struct btrfs_root *new_root; 516d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 51795582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 5185662344bSTsutomu Itoh struct inode *inode; 519f46b5a66SChristoph Hellwig int ret; 520f46b5a66SChristoph Hellwig int err; 5212dfb1e43SQu Wenruo dev_t anon_dev = 0; 522f46b5a66SChristoph Hellwig u64 objectid; 5233de4586cSChris Mason u64 index = 0; 524f46b5a66SChristoph Hellwig 52549a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 52649a3c4d9SDavid Sterba if (!root_item) 52749a3c4d9SDavid Sterba return -ENOMEM; 52849a3c4d9SDavid Sterba 529543068a2SNikolay Borisov ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); 5302fbe8c8aSAl Viro if (ret) 53149a3c4d9SDavid Sterba goto fail_free; 5326a912213SJosef Bacik 5332dfb1e43SQu Wenruo ret = get_anon_bdev(&anon_dev); 5342dfb1e43SQu Wenruo if (ret < 0) 5352dfb1e43SQu Wenruo goto fail_free; 5362dfb1e43SQu Wenruo 537e09fe2d2SQu Wenruo /* 538e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 53901327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 540e09fe2d2SQu Wenruo */ 54149a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 54249a3c4d9SDavid Sterba ret = -ENOSPC; 54349a3c4d9SDavid Sterba goto fail_free; 54449a3c4d9SDavid Sterba } 545e09fe2d2SQu Wenruo 546d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 5479ed74f2dSJosef Bacik /* 548d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 549d5c12070SMiao Xie * of create_snapshot(). 5509ed74f2dSJosef Bacik */ 551c4c129dbSGu JinXiang ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false); 552d5c12070SMiao Xie if (ret) 55349a3c4d9SDavid Sterba goto fail_free; 554f46b5a66SChristoph Hellwig 555d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 556d5c12070SMiao Xie if (IS_ERR(trans)) { 557d5c12070SMiao Xie ret = PTR_ERR(trans); 558e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 55949a3c4d9SDavid Sterba goto fail_free; 560d5c12070SMiao Xie } 561d5c12070SMiao Xie trans->block_rsv = &block_rsv; 562d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 563f46b5a66SChristoph Hellwig 564a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 5656f72c7e2SArne Jansen if (ret) 5666f72c7e2SArne Jansen goto fail; 5676f72c7e2SArne Jansen 5689631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 5699631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 5708e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 5718e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 5728e8a1e31SJosef Bacik goto fail; 5738e8a1e31SJosef Bacik } 574f46b5a66SChristoph Hellwig 575f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 576f46b5a66SChristoph Hellwig 57749a3c4d9SDavid Sterba inode_item = &root_item->inode; 5783cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 5793cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 5803cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 581da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 5820b246afaSJeff Mahoney fs_info->nodesize); 5833cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 584f46b5a66SChristoph Hellwig 58549a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 58649a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 5873cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 58808fe4db1SLi Zefan 58949a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 59049a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 59149a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 59249a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 59349a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 59449a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 595f46b5a66SChristoph Hellwig 59649a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 59749a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 598807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 59949a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 60049a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 60149a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 60249a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 60349a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 604f46b5a66SChristoph Hellwig 605925baeddSChris Mason btrfs_tree_unlock(leaf); 606f46b5a66SChristoph Hellwig 60769948022SNikolay Borisov btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); 608f46b5a66SChristoph Hellwig 609f46b5a66SChristoph Hellwig key.objectid = objectid; 6105d4f98a2SYan Zheng key.offset = 0; 611962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 6120b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 61349a3c4d9SDavid Sterba root_item); 61467addf29SFilipe Manana if (ret) { 61567addf29SFilipe Manana /* 61667addf29SFilipe Manana * Since we don't abort the transaction in this case, free the 61767addf29SFilipe Manana * tree block so that we don't leak space and leave the 61867addf29SFilipe Manana * filesystem in an inconsistent state (an extent item in the 61967addf29SFilipe Manana * extent tree without backreferences). Also no need to have 62067addf29SFilipe Manana * the tree block locked since it is not in any tree at this 62167addf29SFilipe Manana * point, so no other task can find it and use it. 62267addf29SFilipe Manana */ 62367addf29SFilipe Manana btrfs_free_tree_block(trans, root, leaf, 0, 1); 62467addf29SFilipe Manana free_extent_buffer(leaf); 625f46b5a66SChristoph Hellwig goto fail; 62667addf29SFilipe Manana } 62767addf29SFilipe Manana 62867addf29SFilipe Manana free_extent_buffer(leaf); 62967addf29SFilipe Manana leaf = NULL; 630f46b5a66SChristoph Hellwig 63176dda93cSYan, Zheng key.offset = (u64)-1; 6322dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 63379787eaaSJeff Mahoney if (IS_ERR(new_root)) { 6342dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 63579787eaaSJeff Mahoney ret = PTR_ERR(new_root); 63666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 63779787eaaSJeff Mahoney goto fail; 63879787eaaSJeff Mahoney } 6392dfb1e43SQu Wenruo /* Freeing will be done in btrfs_put_root() of new_root */ 6402dfb1e43SQu Wenruo anon_dev = 0; 64176dda93cSYan, Zheng 642221581e4SJosef Bacik ret = btrfs_record_root_in_trans(trans, new_root); 643221581e4SJosef Bacik if (ret) { 644221581e4SJosef Bacik btrfs_put_root(new_root); 645221581e4SJosef Bacik btrfs_abort_transaction(trans, ret); 646221581e4SJosef Bacik goto fail; 647221581e4SJosef Bacik } 64876dda93cSYan, Zheng 6494d4340c9SChristian Brauner ret = btrfs_create_subvol_root(trans, new_root, root, mnt_userns); 65000246528SJosef Bacik btrfs_put_root(new_root); 651ce598979SMark Fasheh if (ret) { 652ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 65366642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 654ce598979SMark Fasheh goto fail; 655ce598979SMark Fasheh } 656ce598979SMark Fasheh 657f46b5a66SChristoph Hellwig /* 658f46b5a66SChristoph Hellwig * insert the directory item 659f46b5a66SChristoph Hellwig */ 660877574e2SNikolay Borisov ret = btrfs_set_inode_index(BTRFS_I(dir), &index); 66179787eaaSJeff Mahoney if (ret) { 66266642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 66379787eaaSJeff Mahoney goto fail; 66479787eaaSJeff Mahoney } 6653de4586cSChris Mason 666684572dfSLu Fengqi ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key, 6673de4586cSChris Mason BTRFS_FT_DIR, index); 66879787eaaSJeff Mahoney if (ret) { 66966642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 670f46b5a66SChristoph Hellwig goto fail; 67179787eaaSJeff Mahoney } 6720660b5afSChris Mason 6736ef06d27SNikolay Borisov btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); 6749a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(dir)); 675c7e54b51SJosef Bacik if (ret) { 676c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 677c7e54b51SJosef Bacik goto fail; 678c7e54b51SJosef Bacik } 67952c26179SYan Zheng 6806025c19fSLu Fengqi ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid, 6814a0cc7caSNikolay Borisov btrfs_ino(BTRFS_I(dir)), index, name, namelen); 682c7e54b51SJosef Bacik if (ret) { 683c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 684c7e54b51SJosef Bacik goto fail; 685c7e54b51SJosef Bacik } 6860660b5afSChris Mason 687cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 6886bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 689dd5f9615SStefan Behrens if (ret) 69066642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 691dd5f9615SStefan Behrens 692f46b5a66SChristoph Hellwig fail: 69349a3c4d9SDavid Sterba kfree(root_item); 694d5c12070SMiao Xie trans->block_rsv = NULL; 695d5c12070SMiao Xie trans->bytes_reserved = 0; 696e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 697de6e8200SLiu Bo 6983a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 699f46b5a66SChristoph Hellwig if (err && !ret) 700f46b5a66SChristoph Hellwig ret = err; 7011a65e24bSChris Mason 7025662344bSTsutomu Itoh if (!ret) { 7035662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 704de6e8200SLiu Bo if (IS_ERR(inode)) 705de6e8200SLiu Bo return PTR_ERR(inode); 7065662344bSTsutomu Itoh d_instantiate(dentry, inode); 7075662344bSTsutomu Itoh } 708f46b5a66SChristoph Hellwig return ret; 70949a3c4d9SDavid Sterba 71049a3c4d9SDavid Sterba fail_free: 7112dfb1e43SQu Wenruo if (anon_dev) 7122dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 71349a3c4d9SDavid Sterba kfree(root_item); 71449a3c4d9SDavid Sterba return ret; 715f46b5a66SChristoph Hellwig } 716f46b5a66SChristoph Hellwig 717e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7189babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 719e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 720f46b5a66SChristoph Hellwig { 7210b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7222e4bfab9SYan, Zheng struct inode *inode; 723f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 724f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7252e4bfab9SYan, Zheng int ret; 726f46b5a66SChristoph Hellwig 72792a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 728f46b5a66SChristoph Hellwig return -EINVAL; 729f46b5a66SChristoph Hellwig 730eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 731eede2bf3SOmar Sandoval btrfs_warn(fs_info, 732eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 733eede2bf3SOmar Sandoval return -ETXTBSY; 734eede2bf3SOmar Sandoval } 735eede2bf3SOmar Sandoval 73623269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 737a1ee7362SDavid Sterba if (!pending_snapshot) 738a1ee7362SDavid Sterba return -ENOMEM; 739a1ee7362SDavid Sterba 7402dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 7412dfb1e43SQu Wenruo if (ret < 0) 7422dfb1e43SQu Wenruo goto free_pending; 743b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 74423269bf5SDavid Sterba GFP_KERNEL); 7458546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 7468546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 747b0c0ea63SDavid Sterba ret = -ENOMEM; 748b0c0ea63SDavid Sterba goto free_pending; 749b0c0ea63SDavid Sterba } 750b0c0ea63SDavid Sterba 75166d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 75266d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 753d5c12070SMiao Xie /* 754d5c12070SMiao Xie * 1 - parent dir inode 755d5c12070SMiao Xie * 2 - dir entries 756d5c12070SMiao Xie * 1 - root item 757d5c12070SMiao Xie * 2 - root ref/backref 758d5c12070SMiao Xie * 1 - root of snapshot 759dd5f9615SStefan Behrens * 1 - UUID item 760d5c12070SMiao Xie */ 761d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 762dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 763ee3441b4SJeff Mahoney false); 764d5c12070SMiao Xie if (ret) 765c11fbb6eSRobbie Ko goto free_pending; 766d5c12070SMiao Xie 767a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 768a22285a6SYan, Zheng pending_snapshot->root = root; 769b83cc969SLi Zefan pending_snapshot->readonly = readonly; 770e9662f70SMiao Xie pending_snapshot->dir = dir; 7718696c533SMiao Xie pending_snapshot->inherit = inherit; 772a22285a6SYan, Zheng 773d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 774a22285a6SYan, Zheng if (IS_ERR(trans)) { 775a22285a6SYan, Zheng ret = PTR_ERR(trans); 776a22285a6SYan, Zheng goto fail; 777a22285a6SYan, Zheng } 778a22285a6SYan, Zheng 7790b246afaSJeff Mahoney spin_lock(&fs_info->trans_lock); 780a22285a6SYan, Zheng list_add(&pending_snapshot->list, 781a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 7820b246afaSJeff Mahoney spin_unlock(&fs_info->trans_lock); 7839babda9fSNikolay Borisov 7843a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 785aec8030aSMiao Xie if (ret) 786c37b2b62SJosef Bacik goto fail; 787a22285a6SYan, Zheng 788a22285a6SYan, Zheng ret = pending_snapshot->error; 789f46b5a66SChristoph Hellwig if (ret) 7902e4bfab9SYan, Zheng goto fail; 791f46b5a66SChristoph Hellwig 792d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 793d3797308SChris Mason if (ret) 794d3797308SChris Mason goto fail; 795d3797308SChris Mason 7962b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 7972e4bfab9SYan, Zheng if (IS_ERR(inode)) { 7982e4bfab9SYan, Zheng ret = PTR_ERR(inode); 7992e4bfab9SYan, Zheng goto fail; 8002e4bfab9SYan, Zheng } 8015662344bSTsutomu Itoh 8022e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8032e4bfab9SYan, Zheng ret = 0; 8042dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8052e4bfab9SYan, Zheng fail: 8062dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 8072dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8082dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 80900246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 810e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 811b0c0ea63SDavid Sterba free_pending: 8122dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8132dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 814b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8158546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 816a1ee7362SDavid Sterba kfree(pending_snapshot); 817a1ee7362SDavid Sterba 818f46b5a66SChristoph Hellwig return ret; 819f46b5a66SChristoph Hellwig } 820f46b5a66SChristoph Hellwig 8214260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8224260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8234260f7c7SSage Weil * whether the type of victim is right. 8244260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8254260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8264260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8274260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8284260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8294260f7c7SSage Weil * a. be owner of dir, or 8304260f7c7SSage Weil * b. be owner of victim, or 8314260f7c7SSage Weil * c. have CAP_FOWNER capability 83201327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 8334260f7c7SSage Weil * links pointing to it. 8344260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8354260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 8364260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 8374260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 8384260f7c7SSage Weil * nfs_async_unlink(). 8394260f7c7SSage Weil */ 8404260f7c7SSage Weil 841c4ed533bSChristian Brauner static int btrfs_may_delete(struct user_namespace *mnt_userns, 842c4ed533bSChristian Brauner struct inode *dir, struct dentry *victim, int isdir) 8434260f7c7SSage Weil { 8444260f7c7SSage Weil int error; 8454260f7c7SSage Weil 8462b0143b5SDavid Howells if (d_really_is_negative(victim)) 8474260f7c7SSage Weil return -ENOENT; 8484260f7c7SSage Weil 8492b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 8504fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 8514260f7c7SSage Weil 852c4ed533bSChristian Brauner error = inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); 8534260f7c7SSage Weil if (error) 8544260f7c7SSage Weil return error; 8554260f7c7SSage Weil if (IS_APPEND(dir)) 8564260f7c7SSage Weil return -EPERM; 857c4ed533bSChristian Brauner if (check_sticky(mnt_userns, dir, d_inode(victim)) || 858ba73d987SChristian Brauner IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) || 859ba73d987SChristian Brauner IS_SWAPFILE(d_inode(victim))) 8604260f7c7SSage Weil return -EPERM; 8614260f7c7SSage Weil if (isdir) { 862e36cb0b8SDavid Howells if (!d_is_dir(victim)) 8634260f7c7SSage Weil return -ENOTDIR; 8644260f7c7SSage Weil if (IS_ROOT(victim)) 8654260f7c7SSage Weil return -EBUSY; 866e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 8674260f7c7SSage Weil return -EISDIR; 8684260f7c7SSage Weil if (IS_DEADDIR(dir)) 8694260f7c7SSage Weil return -ENOENT; 8704260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 8714260f7c7SSage Weil return -EBUSY; 8724260f7c7SSage Weil return 0; 8734260f7c7SSage Weil } 8744260f7c7SSage Weil 875cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 8764d4340c9SChristian Brauner static inline int btrfs_may_create(struct user_namespace *mnt_userns, 8774d4340c9SChristian Brauner struct inode *dir, struct dentry *child) 878cb8e7090SChristoph Hellwig { 8792b0143b5SDavid Howells if (d_really_is_positive(child)) 880cb8e7090SChristoph Hellwig return -EEXIST; 881cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 882cb8e7090SChristoph Hellwig return -ENOENT; 8834d4340c9SChristian Brauner if (!fsuidgid_has_mapping(dir->i_sb, mnt_userns)) 8845474bf40SChristian Brauner return -EOVERFLOW; 8854d4340c9SChristian Brauner return inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); 886cb8e7090SChristoph Hellwig } 887cb8e7090SChristoph Hellwig 888cb8e7090SChristoph Hellwig /* 889cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 890cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 891cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 892cb8e7090SChristoph Hellwig */ 89392872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 8944d4340c9SChristian Brauner struct user_namespace *mnt_userns, 89552f75f4fSDavid Sterba const char *name, int namelen, 89672fd032eSSage Weil struct btrfs_root *snap_src, 8979babda9fSNikolay Borisov bool readonly, 8988696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 899cb8e7090SChristoph Hellwig { 9002b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9010b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 902cb8e7090SChristoph Hellwig struct dentry *dentry; 903cb8e7090SChristoph Hellwig int error; 904cb8e7090SChristoph Hellwig 90500235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 90600235411SAl Viro if (error == -EINTR) 90700235411SAl Viro return error; 908cb8e7090SChristoph Hellwig 9094d4340c9SChristian Brauner dentry = lookup_one(mnt_userns, name, parent->dentry, namelen); 910cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 911cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 912cb8e7090SChristoph Hellwig goto out_unlock; 913cb8e7090SChristoph Hellwig 9144d4340c9SChristian Brauner error = btrfs_may_create(mnt_userns, dir, dentry); 915cb8e7090SChristoph Hellwig if (error) 916a874a63eSLiu Bo goto out_dput; 917cb8e7090SChristoph Hellwig 9189c52057cSChris Mason /* 9199c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9209c52057cSChris Mason * check for them now when we can safely fail 9219c52057cSChris Mason */ 9229c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 9239c52057cSChris Mason dir->i_ino, name, 9249c52057cSChris Mason namelen); 9259c52057cSChris Mason if (error) 9269c52057cSChris Mason goto out_dput; 9279c52057cSChris Mason 9280b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 92976dda93cSYan, Zheng 93076dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 93176dda93cSYan, Zheng goto out_up_read; 93276dda93cSYan, Zheng 9339babda9fSNikolay Borisov if (snap_src) 9349babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 9359babda9fSNikolay Borisov else 9364d4340c9SChristian Brauner error = create_subvol(mnt_userns, dir, dentry, name, namelen, inherit); 9379babda9fSNikolay Borisov 93876dda93cSYan, Zheng if (!error) 93976dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 94076dda93cSYan, Zheng out_up_read: 9410b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 942cb8e7090SChristoph Hellwig out_dput: 943cb8e7090SChristoph Hellwig dput(dentry); 944cb8e7090SChristoph Hellwig out_unlock: 94564708539SJosef Bacik btrfs_inode_unlock(dir, 0); 946cb8e7090SChristoph Hellwig return error; 947cb8e7090SChristoph Hellwig } 948cb8e7090SChristoph Hellwig 949c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 9504d4340c9SChristian Brauner struct user_namespace *mnt_userns, 951c11fbb6eSRobbie Ko const char *name, int namelen, 952c11fbb6eSRobbie Ko struct btrfs_root *root, 953c11fbb6eSRobbie Ko bool readonly, 954c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 955c11fbb6eSRobbie Ko { 956c11fbb6eSRobbie Ko int ret; 957c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 958c11fbb6eSRobbie Ko 959c11fbb6eSRobbie Ko /* 960c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 961c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 962c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 963c11fbb6eSRobbie Ko */ 964c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 965c11fbb6eSRobbie Ko 966f9baa501SFilipe Manana ret = btrfs_start_delalloc_snapshot(root, false); 967c11fbb6eSRobbie Ko if (ret) 968c11fbb6eSRobbie Ko goto out; 969c11fbb6eSRobbie Ko 970c11fbb6eSRobbie Ko /* 971c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 972c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 973c11fbb6eSRobbie Ko * creation. 974c11fbb6eSRobbie Ko */ 975c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 976c11fbb6eSRobbie Ko snapshot_force_cow = true; 977c11fbb6eSRobbie Ko 978c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 979c11fbb6eSRobbie Ko 9804d4340c9SChristian Brauner ret = btrfs_mksubvol(parent, mnt_userns, name, namelen, 981c11fbb6eSRobbie Ko root, readonly, inherit); 982c11fbb6eSRobbie Ko out: 983c11fbb6eSRobbie Ko if (snapshot_force_cow) 984c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 985c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 986c11fbb6eSRobbie Ko return ret; 987c11fbb6eSRobbie Ko } 988c11fbb6eSRobbie Ko 9894cb5300bSChris Mason /* 9904cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 9914cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 9924cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 9934cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 9944cb5300bSChris Mason * part of the file 9954cb5300bSChris Mason */ 996aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 9974cb5300bSChris Mason { 9984cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 9994cb5300bSChris Mason struct extent_map *em = NULL; 10004cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 100176068caeSQu Wenruo const u32 sectorsize = btrfs_sb(inode->i_sb)->sectorsize; 10024cb5300bSChris Mason u64 end; 10034cb5300bSChris Mason 10044cb5300bSChris Mason read_lock(&em_tree->lock); 100576068caeSQu Wenruo em = lookup_extent_mapping(em_tree, offset, sectorsize); 10064cb5300bSChris Mason read_unlock(&em_tree->lock); 10074cb5300bSChris Mason 10084cb5300bSChris Mason if (em) { 10094cb5300bSChris Mason end = extent_map_end(em); 10104cb5300bSChris Mason free_extent_map(em); 10114cb5300bSChris Mason if (end - offset > thresh) 10124cb5300bSChris Mason return 0; 10134cb5300bSChris Mason } 10144cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 10154cb5300bSChris Mason thresh /= 2; 10164cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 10174cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 10184cb5300bSChris Mason if (end >= thresh) 10194cb5300bSChris Mason return 0; 10204cb5300bSChris Mason return 1; 10214cb5300bSChris Mason } 10224cb5300bSChris Mason 10234cb5300bSChris Mason /* 10244cb5300bSChris Mason * helper function to walk through a file and find extents 10254cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 10264cb5300bSChris Mason * 10274cb5300bSChris Mason * This is used by the defragging code to find new and small 10284cb5300bSChris Mason * extents 10294cb5300bSChris Mason */ 10304cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 10314cb5300bSChris Mason struct inode *inode, u64 newer_than, 1032aab110abSDavid Sterba u64 *off, u32 thresh) 10334cb5300bSChris Mason { 10344cb5300bSChris Mason struct btrfs_path *path; 10354cb5300bSChris Mason struct btrfs_key min_key; 10364cb5300bSChris Mason struct extent_buffer *leaf; 10374cb5300bSChris Mason struct btrfs_file_extent_item *extent; 10384cb5300bSChris Mason int type; 10394cb5300bSChris Mason int ret; 10404a0cc7caSNikolay Borisov u64 ino = btrfs_ino(BTRFS_I(inode)); 10414cb5300bSChris Mason 10424cb5300bSChris Mason path = btrfs_alloc_path(); 10434cb5300bSChris Mason if (!path) 10444cb5300bSChris Mason return -ENOMEM; 10454cb5300bSChris Mason 1046a4689d2bSDavid Sterba min_key.objectid = ino; 10474cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 10484cb5300bSChris Mason min_key.offset = *off; 10494cb5300bSChris Mason 10504cb5300bSChris Mason while (1) { 10516174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 10524cb5300bSChris Mason if (ret != 0) 10534cb5300bSChris Mason goto none; 1054f094c9bdSFilipe Manana process_slot: 1055a4689d2bSDavid Sterba if (min_key.objectid != ino) 10564cb5300bSChris Mason goto none; 10574cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 10584cb5300bSChris Mason goto none; 10594cb5300bSChris Mason 10604cb5300bSChris Mason leaf = path->nodes[0]; 10614cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 10624cb5300bSChris Mason struct btrfs_file_extent_item); 10634cb5300bSChris Mason 10644cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 10654cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 10664cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 10674cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 10684cb5300bSChris Mason *off = min_key.offset; 10694cb5300bSChris Mason btrfs_free_path(path); 10704cb5300bSChris Mason return 0; 10714cb5300bSChris Mason } 10724cb5300bSChris Mason 1073f094c9bdSFilipe Manana path->slots[0]++; 1074f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 1075f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 1076f094c9bdSFilipe Manana goto process_slot; 1077f094c9bdSFilipe Manana } 1078f094c9bdSFilipe Manana 10794cb5300bSChris Mason if (min_key.offset == (u64)-1) 10804cb5300bSChris Mason goto none; 10814cb5300bSChris Mason 10824cb5300bSChris Mason min_key.offset++; 10834cb5300bSChris Mason btrfs_release_path(path); 10844cb5300bSChris Mason } 10854cb5300bSChris Mason none: 10864cb5300bSChris Mason btrfs_free_path(path); 10874cb5300bSChris Mason return -ENOENT; 10884cb5300bSChris Mason } 10894cb5300bSChris Mason 10906c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 109117ce6ef8SLiu Bo { 109217ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1093940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 10946c282eb4SLi Zefan struct extent_map *em; 109576068caeSQu Wenruo const u32 sectorsize = BTRFS_I(inode)->root->fs_info->sectorsize; 1096940100a4SChris Mason 1097940100a4SChris Mason /* 1098940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1099940100a4SChris Mason * the full extent lock 1100940100a4SChris Mason */ 1101940100a4SChris Mason read_lock(&em_tree->lock); 110276068caeSQu Wenruo em = lookup_extent_mapping(em_tree, start, sectorsize); 1103940100a4SChris Mason read_unlock(&em_tree->lock); 1104940100a4SChris Mason 1105940100a4SChris Mason if (!em) { 1106308d9800SFilipe Manana struct extent_state *cached = NULL; 110776068caeSQu Wenruo u64 end = start + sectorsize - 1; 1108308d9800SFilipe Manana 1109940100a4SChris Mason /* get the big lock and read metadata off disk */ 1110ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 111176068caeSQu Wenruo em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, sectorsize); 1112e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1113940100a4SChris Mason 11146cf8bfbfSDan Carpenter if (IS_ERR(em)) 11156c282eb4SLi Zefan return NULL; 1116940100a4SChris Mason } 1117940100a4SChris Mason 11186c282eb4SLi Zefan return em; 11196c282eb4SLi Zefan } 11206c282eb4SLi Zefan 11216c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 11226c282eb4SLi Zefan { 11236c282eb4SLi Zefan struct extent_map *next; 11246c282eb4SLi Zefan bool ret = true; 11256c282eb4SLi Zefan 11266c282eb4SLi Zefan /* this is the last extent */ 11276c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 11286c282eb4SLi Zefan return false; 11296c282eb4SLi Zefan 11306c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1131e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1132e9512d72SChris Mason ret = false; 1133e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1134ee22184bSByongho Lee (em->block_len > SZ_128K && next->block_len > SZ_128K)) 11356c282eb4SLi Zefan ret = false; 11366c282eb4SLi Zefan 11376c282eb4SLi Zefan free_extent_map(next); 11386c282eb4SLi Zefan return ret; 11396c282eb4SLi Zefan } 11406c282eb4SLi Zefan 1141aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1142a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1143a43a2111SAndrew Mahone int compress) 11446c282eb4SLi Zefan { 11456c282eb4SLi Zefan struct extent_map *em; 11466c282eb4SLi Zefan int ret = 1; 11476c282eb4SLi Zefan bool next_mergeable = true; 11484a3560c4SLiu Bo bool prev_mergeable = true; 11496c282eb4SLi Zefan 11506c282eb4SLi Zefan /* 11516c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 11526c282eb4SLi Zefan * defragging it 11536c282eb4SLi Zefan */ 11546c282eb4SLi Zefan if (start < *defrag_end) 11556c282eb4SLi Zefan return 1; 11566c282eb4SLi Zefan 11576c282eb4SLi Zefan *skip = 0; 11586c282eb4SLi Zefan 11596c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 11606c282eb4SLi Zefan if (!em) 11616c282eb4SLi Zefan return 0; 11626c282eb4SLi Zefan 1163940100a4SChris Mason /* this will cover holes, and inline extents */ 116417ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1165940100a4SChris Mason ret = 0; 116617ce6ef8SLiu Bo goto out; 116717ce6ef8SLiu Bo } 116817ce6ef8SLiu Bo 11694a3560c4SLiu Bo if (!*defrag_end) 11704a3560c4SLiu Bo prev_mergeable = false; 11714a3560c4SLiu Bo 11726c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1173940100a4SChris Mason /* 11746c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 11756c282eb4SLi Zefan * real extent, don't bother defragging it 1176940100a4SChris Mason */ 1177a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 11784a3560c4SLiu Bo (em->len >= thresh || (!next_mergeable && !prev_mergeable))) 1179940100a4SChris Mason ret = 0; 118017ce6ef8SLiu Bo out: 1181940100a4SChris Mason /* 1182940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1183940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1184940100a4SChris Mason * so that the next tiny extent will force a defrag. 1185940100a4SChris Mason * 1186940100a4SChris Mason * The end result of this is that tiny extents before a single big 1187940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1188940100a4SChris Mason */ 1189940100a4SChris Mason if (ret) { 1190940100a4SChris Mason *defrag_end = extent_map_end(em); 1191940100a4SChris Mason } else { 1192940100a4SChris Mason *last_len = 0; 1193940100a4SChris Mason *skip = extent_map_end(em); 1194940100a4SChris Mason *defrag_end = 0; 1195940100a4SChris Mason } 1196940100a4SChris Mason 1197940100a4SChris Mason free_extent_map(em); 1198940100a4SChris Mason return ret; 1199940100a4SChris Mason } 1200940100a4SChris Mason 12014cb5300bSChris Mason /* 12025767b50cSQu Wenruo * Prepare one page to be defragged. 12035767b50cSQu Wenruo * 12045767b50cSQu Wenruo * This will ensure: 12055767b50cSQu Wenruo * 12065767b50cSQu Wenruo * - Returned page is locked and has been set up properly. 12075767b50cSQu Wenruo * - No ordered extent exists in the page. 12085767b50cSQu Wenruo * - The page is uptodate. 12095767b50cSQu Wenruo * 12105767b50cSQu Wenruo * NOTE: Caller should also wait for page writeback after the cluster is 12115767b50cSQu Wenruo * prepared, here we don't do writeback wait for each page. 12125767b50cSQu Wenruo */ 12135767b50cSQu Wenruo static struct page *defrag_prepare_one_page(struct btrfs_inode *inode, 12145767b50cSQu Wenruo pgoff_t index) 12155767b50cSQu Wenruo { 12165767b50cSQu Wenruo struct address_space *mapping = inode->vfs_inode.i_mapping; 12175767b50cSQu Wenruo gfp_t mask = btrfs_alloc_write_mask(mapping); 12185767b50cSQu Wenruo u64 page_start = (u64)index << PAGE_SHIFT; 12195767b50cSQu Wenruo u64 page_end = page_start + PAGE_SIZE - 1; 12205767b50cSQu Wenruo struct extent_state *cached_state = NULL; 12215767b50cSQu Wenruo struct page *page; 12225767b50cSQu Wenruo int ret; 12235767b50cSQu Wenruo 12245767b50cSQu Wenruo again: 12255767b50cSQu Wenruo page = find_or_create_page(mapping, index, mask); 12265767b50cSQu Wenruo if (!page) 12275767b50cSQu Wenruo return ERR_PTR(-ENOMEM); 12285767b50cSQu Wenruo 12295767b50cSQu Wenruo ret = set_page_extent_mapped(page); 12305767b50cSQu Wenruo if (ret < 0) { 12315767b50cSQu Wenruo unlock_page(page); 12325767b50cSQu Wenruo put_page(page); 12335767b50cSQu Wenruo return ERR_PTR(ret); 12345767b50cSQu Wenruo } 12355767b50cSQu Wenruo 12365767b50cSQu Wenruo /* Wait for any existing ordered extent in the range */ 12375767b50cSQu Wenruo while (1) { 12385767b50cSQu Wenruo struct btrfs_ordered_extent *ordered; 12395767b50cSQu Wenruo 12405767b50cSQu Wenruo lock_extent_bits(&inode->io_tree, page_start, page_end, &cached_state); 12415767b50cSQu Wenruo ordered = btrfs_lookup_ordered_range(inode, page_start, PAGE_SIZE); 12425767b50cSQu Wenruo unlock_extent_cached(&inode->io_tree, page_start, page_end, 12435767b50cSQu Wenruo &cached_state); 12445767b50cSQu Wenruo if (!ordered) 12455767b50cSQu Wenruo break; 12465767b50cSQu Wenruo 12475767b50cSQu Wenruo unlock_page(page); 12485767b50cSQu Wenruo btrfs_start_ordered_extent(ordered, 1); 12495767b50cSQu Wenruo btrfs_put_ordered_extent(ordered); 12505767b50cSQu Wenruo lock_page(page); 12515767b50cSQu Wenruo /* 12525767b50cSQu Wenruo * We unlocked the page above, so we need check if it was 12535767b50cSQu Wenruo * released or not. 12545767b50cSQu Wenruo */ 12555767b50cSQu Wenruo if (page->mapping != mapping || !PagePrivate(page)) { 12565767b50cSQu Wenruo unlock_page(page); 12575767b50cSQu Wenruo put_page(page); 12585767b50cSQu Wenruo goto again; 12595767b50cSQu Wenruo } 12605767b50cSQu Wenruo } 12615767b50cSQu Wenruo 12625767b50cSQu Wenruo /* 12635767b50cSQu Wenruo * Now the page range has no ordered extent any more. Read the page to 12645767b50cSQu Wenruo * make it uptodate. 12655767b50cSQu Wenruo */ 12665767b50cSQu Wenruo if (!PageUptodate(page)) { 12675767b50cSQu Wenruo btrfs_readpage(NULL, page); 12685767b50cSQu Wenruo lock_page(page); 12695767b50cSQu Wenruo if (page->mapping != mapping || !PagePrivate(page)) { 12705767b50cSQu Wenruo unlock_page(page); 12715767b50cSQu Wenruo put_page(page); 12725767b50cSQu Wenruo goto again; 12735767b50cSQu Wenruo } 12745767b50cSQu Wenruo if (!PageUptodate(page)) { 12755767b50cSQu Wenruo unlock_page(page); 12765767b50cSQu Wenruo put_page(page); 12775767b50cSQu Wenruo return ERR_PTR(-EIO); 12785767b50cSQu Wenruo } 12795767b50cSQu Wenruo } 12805767b50cSQu Wenruo return page; 12815767b50cSQu Wenruo } 12825767b50cSQu Wenruo 12835767b50cSQu Wenruo /* 12844cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 12854cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 12864cb5300bSChris Mason * to COW and defrag. 12874cb5300bSChris Mason * 12884cb5300bSChris Mason * It also makes sure the delalloc code has enough 12894cb5300bSChris Mason * dirty data to avoid making new small extents as part 12904cb5300bSChris Mason * of the defrag 12914cb5300bSChris Mason * 12924cb5300bSChris Mason * It's a good idea to start RA on this range 12934cb5300bSChris Mason * before calling this. 12944cb5300bSChris Mason */ 12954cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 12964cb5300bSChris Mason struct page **pages, 12974cb5300bSChris Mason unsigned long start_index, 1298c41570c9SJustin Maggard unsigned long num_pages) 1299f46b5a66SChristoph Hellwig { 13004cb5300bSChris Mason unsigned long file_end; 13014cb5300bSChris Mason u64 isize = i_size_read(inode); 1302f46b5a66SChristoph Hellwig u64 page_start; 1303f46b5a66SChristoph Hellwig u64 page_end; 13041f12bd06SLiu Bo u64 page_cnt; 1305a1fbc675SMatthew Wilcox (Oracle) u64 start = (u64)start_index << PAGE_SHIFT; 13067f458a38SFilipe Manana u64 search_start; 13074cb5300bSChris Mason int ret; 13084cb5300bSChris Mason int i; 13094cb5300bSChris Mason int i_done; 13104cb5300bSChris Mason struct extent_state *cached_state = NULL; 1311364ecf36SQu Wenruo struct extent_changeset *data_reserved = NULL; 13124cb5300bSChris Mason 131309cbfeafSKirill A. Shutemov file_end = (isize - 1) >> PAGE_SHIFT; 13141f12bd06SLiu Bo if (!isize || start_index > file_end) 13151f12bd06SLiu Bo return 0; 13161f12bd06SLiu Bo 13171f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 13184cb5300bSChris Mason 1319e5b7231eSNikolay Borisov ret = btrfs_delalloc_reserve_space(BTRFS_I(inode), &data_reserved, 1320a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT); 13214cb5300bSChris Mason if (ret) 13224cb5300bSChris Mason return ret; 13234cb5300bSChris Mason i_done = 0; 13244cb5300bSChris Mason 13254cb5300bSChris Mason /* step one, lock all the pages */ 13261f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 13274cb5300bSChris Mason struct page *page; 13284cb5300bSChris Mason 13295767b50cSQu Wenruo page = defrag_prepare_one_page(BTRFS_I(inode), start_index + i); 13305767b50cSQu Wenruo if (IS_ERR(page)) { 13315767b50cSQu Wenruo ret = PTR_ERR(page); 133232443de3SQu Wenruo break; 133332443de3SQu Wenruo } 13344cb5300bSChris Mason pages[i] = page; 13354cb5300bSChris Mason i_done++; 13364cb5300bSChris Mason } 13374cb5300bSChris Mason if (!i_done || ret) 13384cb5300bSChris Mason goto out; 13394cb5300bSChris Mason 13401751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 13414cb5300bSChris Mason goto out; 13424cb5300bSChris Mason 13434cb5300bSChris Mason /* 13445767b50cSQu Wenruo * Now we have a nice long stream of locked and up to date pages, let's 13455767b50cSQu Wenruo * wait on them. 13464cb5300bSChris Mason */ 13474cb5300bSChris Mason for (i = 0; i < i_done; i++) 13484cb5300bSChris Mason wait_on_page_writeback(pages[i]); 13494cb5300bSChris Mason 13504cb5300bSChris Mason page_start = page_offset(pages[0]); 135109cbfeafSKirill A. Shutemov page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE; 13524cb5300bSChris Mason 13534cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1354ff13db41SDavid Sterba page_start, page_end - 1, &cached_state); 13557f458a38SFilipe Manana 13567f458a38SFilipe Manana /* 13577f458a38SFilipe Manana * When defragmenting we skip ranges that have holes or inline extents, 13587f458a38SFilipe Manana * (check should_defrag_range()), to avoid unnecessary IO and wasting 13597f458a38SFilipe Manana * space. At btrfs_defrag_file(), we check if a range should be defragged 13607f458a38SFilipe Manana * before locking the inode and then, if it should, we trigger a sync 13617f458a38SFilipe Manana * page cache readahead - we lock the inode only after that to avoid 13627f458a38SFilipe Manana * blocking for too long other tasks that possibly want to operate on 13637f458a38SFilipe Manana * other file ranges. But before we were able to get the inode lock, 13647f458a38SFilipe Manana * some other task may have punched a hole in the range, or we may have 13657f458a38SFilipe Manana * now an inline extent, in which case we should not defrag. So check 13667f458a38SFilipe Manana * for that here, where we have the inode and the range locked, and bail 13677f458a38SFilipe Manana * out if that happened. 13687f458a38SFilipe Manana */ 13697f458a38SFilipe Manana search_start = page_start; 13707f458a38SFilipe Manana while (search_start < page_end) { 13717f458a38SFilipe Manana struct extent_map *em; 13727f458a38SFilipe Manana 13737f458a38SFilipe Manana em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, search_start, 13747f458a38SFilipe Manana page_end - search_start); 13757f458a38SFilipe Manana if (IS_ERR(em)) { 13767f458a38SFilipe Manana ret = PTR_ERR(em); 13777f458a38SFilipe Manana goto out_unlock_range; 13787f458a38SFilipe Manana } 13797f458a38SFilipe Manana if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 13807f458a38SFilipe Manana free_extent_map(em); 13817f458a38SFilipe Manana /* Ok, 0 means we did not defrag anything */ 13827f458a38SFilipe Manana ret = 0; 13837f458a38SFilipe Manana goto out_unlock_range; 13847f458a38SFilipe Manana } 13857f458a38SFilipe Manana search_start = extent_map_end(em); 13867f458a38SFilipe Manana free_extent_map(em); 13877f458a38SFilipe Manana } 13887f458a38SFilipe Manana 13894cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 1390e182163dSOmar Sandoval page_end - 1, EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 1391e182163dSOmar Sandoval EXTENT_DEFRAG, 0, 0, &cached_state); 13924cb5300bSChris Mason 13931f12bd06SLiu Bo if (i_done != page_cnt) { 13949e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 139528c4a3e2SSu Yue btrfs_mod_outstanding_extents(BTRFS_I(inode), 1); 13969e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 139786d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1398a1fbc675SMatthew Wilcox (Oracle) start, (page_cnt - i_done) << PAGE_SHIFT, true); 13994cb5300bSChris Mason } 14004cb5300bSChris Mason 14014cb5300bSChris Mason 14029e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 1403018ed4f7SDavid Sterba &cached_state); 14044cb5300bSChris Mason 14054cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 1406e43bbe5eSDavid Sterba page_start, page_end - 1, &cached_state); 14074cb5300bSChris Mason 14084cb5300bSChris Mason for (i = 0; i < i_done; i++) { 14094cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 14104cb5300bSChris Mason ClearPageChecked(pages[i]); 14114cb5300bSChris Mason set_page_dirty(pages[i]); 14124cb5300bSChris Mason unlock_page(pages[i]); 141309cbfeafSKirill A. Shutemov put_page(pages[i]); 14144cb5300bSChris Mason } 14158702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1416364ecf36SQu Wenruo extent_changeset_free(data_reserved); 14174cb5300bSChris Mason return i_done; 14187f458a38SFilipe Manana 14197f458a38SFilipe Manana out_unlock_range: 14207f458a38SFilipe Manana unlock_extent_cached(&BTRFS_I(inode)->io_tree, 14217f458a38SFilipe Manana page_start, page_end - 1, &cached_state); 14224cb5300bSChris Mason out: 14234cb5300bSChris Mason for (i = 0; i < i_done; i++) { 14244cb5300bSChris Mason unlock_page(pages[i]); 142509cbfeafSKirill A. Shutemov put_page(pages[i]); 14264cb5300bSChris Mason } 142786d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1428a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT, true); 14298702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1430364ecf36SQu Wenruo extent_changeset_free(data_reserved); 14314cb5300bSChris Mason return ret; 14324cb5300bSChris Mason 14334cb5300bSChris Mason } 14344cb5300bSChris Mason 1435eb793cf8SQu Wenruo struct defrag_target_range { 1436eb793cf8SQu Wenruo struct list_head list; 1437eb793cf8SQu Wenruo u64 start; 1438eb793cf8SQu Wenruo u64 len; 1439eb793cf8SQu Wenruo }; 1440eb793cf8SQu Wenruo 1441eb793cf8SQu Wenruo /* 1442eb793cf8SQu Wenruo * Collect all valid target extents. 1443eb793cf8SQu Wenruo * 1444eb793cf8SQu Wenruo * @start: file offset to lookup 1445eb793cf8SQu Wenruo * @len: length to lookup 1446eb793cf8SQu Wenruo * @extent_thresh: file extent size threshold, any extent size >= this value 1447eb793cf8SQu Wenruo * will be ignored 1448eb793cf8SQu Wenruo * @newer_than: only defrag extents newer than this value 1449eb793cf8SQu Wenruo * @do_compress: whether the defrag is doing compression 1450eb793cf8SQu Wenruo * if true, @extent_thresh will be ignored and all regular 1451eb793cf8SQu Wenruo * file extents meeting @newer_than will be targets. 1452eb793cf8SQu Wenruo * @target_list: list of targets file extents 1453eb793cf8SQu Wenruo */ 1454eb793cf8SQu Wenruo static int defrag_collect_targets(struct btrfs_inode *inode, 1455eb793cf8SQu Wenruo u64 start, u64 len, u32 extent_thresh, 1456eb793cf8SQu Wenruo u64 newer_than, bool do_compress, 1457eb793cf8SQu Wenruo struct list_head *target_list) 1458eb793cf8SQu Wenruo { 1459eb793cf8SQu Wenruo u64 cur = start; 1460eb793cf8SQu Wenruo int ret = 0; 1461eb793cf8SQu Wenruo 1462eb793cf8SQu Wenruo while (cur < start + len) { 1463eb793cf8SQu Wenruo struct extent_map *em; 1464eb793cf8SQu Wenruo struct defrag_target_range *new; 1465eb793cf8SQu Wenruo bool next_mergeable = true; 1466eb793cf8SQu Wenruo u64 range_len; 1467eb793cf8SQu Wenruo 1468eb793cf8SQu Wenruo em = defrag_lookup_extent(&inode->vfs_inode, cur); 1469eb793cf8SQu Wenruo if (!em) 1470eb793cf8SQu Wenruo break; 1471eb793cf8SQu Wenruo 1472eb793cf8SQu Wenruo /* Skip hole/inline/preallocated extents */ 1473eb793cf8SQu Wenruo if (em->block_start >= EXTENT_MAP_LAST_BYTE || 1474eb793cf8SQu Wenruo test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) 1475eb793cf8SQu Wenruo goto next; 1476eb793cf8SQu Wenruo 1477eb793cf8SQu Wenruo /* Skip older extent */ 1478eb793cf8SQu Wenruo if (em->generation < newer_than) 1479eb793cf8SQu Wenruo goto next; 1480eb793cf8SQu Wenruo 1481eb793cf8SQu Wenruo /* 1482eb793cf8SQu Wenruo * For do_compress case, we want to compress all valid file 1483eb793cf8SQu Wenruo * extents, thus no @extent_thresh or mergeable check. 1484eb793cf8SQu Wenruo */ 1485eb793cf8SQu Wenruo if (do_compress) 1486eb793cf8SQu Wenruo goto add; 1487eb793cf8SQu Wenruo 1488eb793cf8SQu Wenruo /* Skip too large extent */ 1489eb793cf8SQu Wenruo if (em->len >= extent_thresh) 1490eb793cf8SQu Wenruo goto next; 1491eb793cf8SQu Wenruo 1492eb793cf8SQu Wenruo next_mergeable = defrag_check_next_extent(&inode->vfs_inode, em); 1493eb793cf8SQu Wenruo if (!next_mergeable) { 1494eb793cf8SQu Wenruo struct defrag_target_range *last; 1495eb793cf8SQu Wenruo 1496eb793cf8SQu Wenruo /* Empty target list, no way to merge with last entry */ 1497eb793cf8SQu Wenruo if (list_empty(target_list)) 1498eb793cf8SQu Wenruo goto next; 1499eb793cf8SQu Wenruo last = list_entry(target_list->prev, 1500eb793cf8SQu Wenruo struct defrag_target_range, list); 1501eb793cf8SQu Wenruo /* Not mergeable with last entry */ 1502eb793cf8SQu Wenruo if (last->start + last->len != cur) 1503eb793cf8SQu Wenruo goto next; 1504eb793cf8SQu Wenruo 1505eb793cf8SQu Wenruo /* Mergeable, fall through to add it to @target_list. */ 1506eb793cf8SQu Wenruo } 1507eb793cf8SQu Wenruo 1508eb793cf8SQu Wenruo add: 1509eb793cf8SQu Wenruo range_len = min(extent_map_end(em), start + len) - cur; 1510eb793cf8SQu Wenruo /* 1511eb793cf8SQu Wenruo * This one is a good target, check if it can be merged into 1512eb793cf8SQu Wenruo * last range of the target list. 1513eb793cf8SQu Wenruo */ 1514eb793cf8SQu Wenruo if (!list_empty(target_list)) { 1515eb793cf8SQu Wenruo struct defrag_target_range *last; 1516eb793cf8SQu Wenruo 1517eb793cf8SQu Wenruo last = list_entry(target_list->prev, 1518eb793cf8SQu Wenruo struct defrag_target_range, list); 1519eb793cf8SQu Wenruo ASSERT(last->start + last->len <= cur); 1520eb793cf8SQu Wenruo if (last->start + last->len == cur) { 1521eb793cf8SQu Wenruo /* Mergeable, enlarge the last entry */ 1522eb793cf8SQu Wenruo last->len += range_len; 1523eb793cf8SQu Wenruo goto next; 1524eb793cf8SQu Wenruo } 1525eb793cf8SQu Wenruo /* Fall through to allocate a new entry */ 1526eb793cf8SQu Wenruo } 1527eb793cf8SQu Wenruo 1528eb793cf8SQu Wenruo /* Allocate new defrag_target_range */ 1529eb793cf8SQu Wenruo new = kmalloc(sizeof(*new), GFP_NOFS); 1530eb793cf8SQu Wenruo if (!new) { 1531eb793cf8SQu Wenruo free_extent_map(em); 1532eb793cf8SQu Wenruo ret = -ENOMEM; 1533eb793cf8SQu Wenruo break; 1534eb793cf8SQu Wenruo } 1535eb793cf8SQu Wenruo new->start = cur; 1536eb793cf8SQu Wenruo new->len = range_len; 1537eb793cf8SQu Wenruo list_add_tail(&new->list, target_list); 1538eb793cf8SQu Wenruo 1539eb793cf8SQu Wenruo next: 1540eb793cf8SQu Wenruo cur = extent_map_end(em); 1541eb793cf8SQu Wenruo free_extent_map(em); 1542eb793cf8SQu Wenruo } 1543eb793cf8SQu Wenruo if (ret < 0) { 1544eb793cf8SQu Wenruo struct defrag_target_range *entry; 1545eb793cf8SQu Wenruo struct defrag_target_range *tmp; 1546eb793cf8SQu Wenruo 1547eb793cf8SQu Wenruo list_for_each_entry_safe(entry, tmp, target_list, list) { 1548eb793cf8SQu Wenruo list_del_init(&entry->list); 1549eb793cf8SQu Wenruo kfree(entry); 1550eb793cf8SQu Wenruo } 1551eb793cf8SQu Wenruo } 1552eb793cf8SQu Wenruo return ret; 1553eb793cf8SQu Wenruo } 1554eb793cf8SQu Wenruo 1555*22b398eeSQu Wenruo #define CLUSTER_SIZE (SZ_256K) 1556*22b398eeSQu Wenruo 1557*22b398eeSQu Wenruo /* 1558*22b398eeSQu Wenruo * Defrag one contiguous target range. 1559*22b398eeSQu Wenruo * 1560*22b398eeSQu Wenruo * @inode: target inode 1561*22b398eeSQu Wenruo * @target: target range to defrag 1562*22b398eeSQu Wenruo * @pages: locked pages covering the defrag range 1563*22b398eeSQu Wenruo * @nr_pages: number of locked pages 1564*22b398eeSQu Wenruo * 1565*22b398eeSQu Wenruo * Caller should ensure: 1566*22b398eeSQu Wenruo * 1567*22b398eeSQu Wenruo * - Pages are prepared 1568*22b398eeSQu Wenruo * Pages should be locked, no ordered extent in the pages range, 1569*22b398eeSQu Wenruo * no writeback. 1570*22b398eeSQu Wenruo * 1571*22b398eeSQu Wenruo * - Extent bits are locked 1572*22b398eeSQu Wenruo */ 1573*22b398eeSQu Wenruo static int defrag_one_locked_target(struct btrfs_inode *inode, 1574*22b398eeSQu Wenruo struct defrag_target_range *target, 1575*22b398eeSQu Wenruo struct page **pages, int nr_pages, 1576*22b398eeSQu Wenruo struct extent_state **cached_state) 1577*22b398eeSQu Wenruo { 1578*22b398eeSQu Wenruo struct btrfs_fs_info *fs_info = inode->root->fs_info; 1579*22b398eeSQu Wenruo struct extent_changeset *data_reserved = NULL; 1580*22b398eeSQu Wenruo const u64 start = target->start; 1581*22b398eeSQu Wenruo const u64 len = target->len; 1582*22b398eeSQu Wenruo unsigned long last_index = (start + len - 1) >> PAGE_SHIFT; 1583*22b398eeSQu Wenruo unsigned long start_index = start >> PAGE_SHIFT; 1584*22b398eeSQu Wenruo unsigned long first_index = page_index(pages[0]); 1585*22b398eeSQu Wenruo int ret = 0; 1586*22b398eeSQu Wenruo int i; 1587*22b398eeSQu Wenruo 1588*22b398eeSQu Wenruo ASSERT(last_index - first_index + 1 <= nr_pages); 1589*22b398eeSQu Wenruo 1590*22b398eeSQu Wenruo ret = btrfs_delalloc_reserve_space(inode, &data_reserved, start, len); 1591*22b398eeSQu Wenruo if (ret < 0) 1592*22b398eeSQu Wenruo return ret; 1593*22b398eeSQu Wenruo clear_extent_bit(&inode->io_tree, start, start + len - 1, 1594*22b398eeSQu Wenruo EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 1595*22b398eeSQu Wenruo EXTENT_DEFRAG, 0, 0, cached_state); 1596*22b398eeSQu Wenruo set_extent_defrag(&inode->io_tree, start, start + len - 1, cached_state); 1597*22b398eeSQu Wenruo 1598*22b398eeSQu Wenruo /* Update the page status */ 1599*22b398eeSQu Wenruo for (i = start_index - first_index; i <= last_index - first_index; i++) { 1600*22b398eeSQu Wenruo ClearPageChecked(pages[i]); 1601*22b398eeSQu Wenruo btrfs_page_clamp_set_dirty(fs_info, pages[i], start, len); 1602*22b398eeSQu Wenruo } 1603*22b398eeSQu Wenruo btrfs_delalloc_release_extents(inode, len); 1604*22b398eeSQu Wenruo extent_changeset_free(data_reserved); 1605*22b398eeSQu Wenruo 1606*22b398eeSQu Wenruo return ret; 1607*22b398eeSQu Wenruo } 1608*22b398eeSQu Wenruo 16091ccc2e8aSQu Wenruo /* 16101ccc2e8aSQu Wenruo * Entry point to file defragmentation. 16111ccc2e8aSQu Wenruo * 16121ccc2e8aSQu Wenruo * @inode: inode to be defragged 16131ccc2e8aSQu Wenruo * @ra: readahead state (can be NUL) 16141ccc2e8aSQu Wenruo * @range: defrag options including range and flags 16151ccc2e8aSQu Wenruo * @newer_than: minimum transid to defrag 16161ccc2e8aSQu Wenruo * @max_to_defrag: max number of sectors to be defragged, if 0, the whole inode 16171ccc2e8aSQu Wenruo * will be defragged. 16181ccc2e8aSQu Wenruo */ 16191ccc2e8aSQu Wenruo int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra, 16204cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 16214cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 16224cb5300bSChris Mason { 16230b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 16244cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 16254cb5300bSChris Mason unsigned long last_index; 1626151a31b2SLi Zefan u64 isize = i_size_read(inode); 1627940100a4SChris Mason u64 last_len = 0; 1628940100a4SChris Mason u64 skip = 0; 1629940100a4SChris Mason u64 defrag_end = 0; 16304cb5300bSChris Mason u64 newer_off = range->start; 1631f46b5a66SChristoph Hellwig unsigned long i; 1632008873eaSLi Zefan unsigned long ra_index = 0; 1633f46b5a66SChristoph Hellwig int ret; 16344cb5300bSChris Mason int defrag_count = 0; 16351a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1636aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 163709cbfeafSKirill A. Shutemov unsigned long max_cluster = SZ_256K >> PAGE_SHIFT; 1638c41570c9SJustin Maggard unsigned long cluster = max_cluster; 1639ee22184bSByongho Lee u64 new_align = ~((u64)SZ_128K - 1); 16404cb5300bSChris Mason struct page **pages = NULL; 16411e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 16421ccc2e8aSQu Wenruo bool ra_allocated = false; 16434cb5300bSChris Mason 16440abd5b17SLiu Bo if (isize == 0) 16450abd5b17SLiu Bo return 0; 16460abd5b17SLiu Bo 16470abd5b17SLiu Bo if (range->start >= isize) 16480abd5b17SLiu Bo return -EINVAL; 16491a419d85SLi Zefan 16501e2ef46dSDavid Sterba if (do_compress) { 1651ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 16521a419d85SLi Zefan return -EINVAL; 16531a419d85SLi Zefan if (range->compress_type) 16541a419d85SLi Zefan compress_type = range->compress_type; 16551a419d85SLi Zefan } 1656f46b5a66SChristoph Hellwig 16570abd5b17SLiu Bo if (extent_thresh == 0) 1658ee22184bSByongho Lee extent_thresh = SZ_256K; 1659f46b5a66SChristoph Hellwig 16604cb5300bSChris Mason /* 16611ccc2e8aSQu Wenruo * If we were not given a ra, allocate a readahead context. As 16620a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 16630a52d108SDavid Sterba * we don't error out. 16644cb5300bSChris Mason */ 16651ccc2e8aSQu Wenruo if (!ra) { 16661ccc2e8aSQu Wenruo ra_allocated = true; 166763e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 16680a52d108SDavid Sterba if (ra) 16694cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 16704cb5300bSChris Mason } 16714cb5300bSChris Mason 167263e727ecSDavid Sterba pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL); 16734cb5300bSChris Mason if (!pages) { 16744cb5300bSChris Mason ret = -ENOMEM; 16754cb5300bSChris Mason goto out_ra; 16764cb5300bSChris Mason } 16774cb5300bSChris Mason 16784cb5300bSChris Mason /* find the last page to defrag */ 16791e701a32SChris Mason if (range->start + range->len > range->start) { 1680151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 168109cbfeafSKirill A. Shutemov range->start + range->len - 1) >> PAGE_SHIFT; 16821e701a32SChris Mason } else { 168309cbfeafSKirill A. Shutemov last_index = (isize - 1) >> PAGE_SHIFT; 16841e701a32SChris Mason } 16851e701a32SChris Mason 16864cb5300bSChris Mason if (newer_than) { 16874cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 1688ee22184bSByongho Lee &newer_off, SZ_64K); 16894cb5300bSChris Mason if (!ret) { 16904cb5300bSChris Mason range->start = newer_off; 16914cb5300bSChris Mason /* 16924cb5300bSChris Mason * we always align our defrag to help keep 16934cb5300bSChris Mason * the extents in the file evenly spaced 16944cb5300bSChris Mason */ 169509cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 16964cb5300bSChris Mason } else 16974cb5300bSChris Mason goto out_ra; 16984cb5300bSChris Mason } else { 169909cbfeafSKirill A. Shutemov i = range->start >> PAGE_SHIFT; 17004cb5300bSChris Mason } 17014cb5300bSChris Mason if (!max_to_defrag) 1702070034bdSchandan max_to_defrag = last_index - i + 1; 17034cb5300bSChris Mason 17042a0f7f57SLi Zefan /* 17052a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 17062a0f7f57SLi Zefan * written sequentially. 17072a0f7f57SLi Zefan */ 17082a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 17092a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 17102a0f7f57SLi Zefan 1711f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 171209cbfeafSKirill A. Shutemov (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) { 17134cb5300bSChris Mason /* 17144cb5300bSChris Mason * make sure we stop running if someone unmounts 17154cb5300bSChris Mason * the FS 17164cb5300bSChris Mason */ 17171751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 17184cb5300bSChris Mason break; 17194cb5300bSChris Mason 17200b246afaSJeff Mahoney if (btrfs_defrag_cancelled(fs_info)) { 17210b246afaSJeff Mahoney btrfs_debug(fs_info, "defrag_file cancelled"); 1722210549ebSDavid Sterba ret = -EAGAIN; 172350535db8STian Tao goto error; 1724210549ebSDavid Sterba } 1725210549ebSDavid Sterba 172609cbfeafSKirill A. Shutemov if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT, 17276c282eb4SLi Zefan extent_thresh, &last_len, &skip, 17281e2ef46dSDavid Sterba &defrag_end, do_compress)){ 1729940100a4SChris Mason unsigned long next; 1730940100a4SChris Mason /* 1731940100a4SChris Mason * the should_defrag function tells us how much to skip 1732940100a4SChris Mason * bump our counter by the suggested amount 1733940100a4SChris Mason */ 173409cbfeafSKirill A. Shutemov next = DIV_ROUND_UP(skip, PAGE_SIZE); 1735940100a4SChris Mason i = max(i + 1, next); 1736940100a4SChris Mason continue; 1737940100a4SChris Mason } 1738008873eaSLi Zefan 1739008873eaSLi Zefan if (!newer_than) { 174009cbfeafSKirill A. Shutemov cluster = (PAGE_ALIGN(defrag_end) >> 174109cbfeafSKirill A. Shutemov PAGE_SHIFT) - i; 1742008873eaSLi Zefan cluster = min(cluster, max_cluster); 1743008873eaSLi Zefan } else { 1744008873eaSLi Zefan cluster = max_cluster; 1745008873eaSLi Zefan } 1746008873eaSLi Zefan 1747008873eaSLi Zefan if (i + cluster > ra_index) { 1748008873eaSLi Zefan ra_index = max(i, ra_index); 17490a52d108SDavid Sterba if (ra) 1750d3c0bab5SDavid Sterba page_cache_sync_readahead(inode->i_mapping, ra, 17511ccc2e8aSQu Wenruo NULL, ra_index, cluster); 1752e4826a5bSchandan ra_index += cluster; 1753008873eaSLi Zefan } 17544cb5300bSChris Mason 175564708539SJosef Bacik btrfs_inode_lock(inode, 0); 1756eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1757eede2bf3SOmar Sandoval ret = -ETXTBSY; 1758eede2bf3SOmar Sandoval } else { 17591e2ef46dSDavid Sterba if (do_compress) 1760eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 1761008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1762eede2bf3SOmar Sandoval } 1763ecb8bea8SLiu Bo if (ret < 0) { 176464708539SJosef Bacik btrfs_inode_unlock(inode, 0); 17654cb5300bSChris Mason goto out_ra; 1766ecb8bea8SLiu Bo } 17674cb5300bSChris Mason 17684cb5300bSChris Mason defrag_count += ret; 1769d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 177064708539SJosef Bacik btrfs_inode_unlock(inode, 0); 17714cb5300bSChris Mason 17724cb5300bSChris Mason if (newer_than) { 17734cb5300bSChris Mason if (newer_off == (u64)-1) 17744cb5300bSChris Mason break; 17754cb5300bSChris Mason 1776e1f041e1SLiu Bo if (ret > 0) 1777e1f041e1SLiu Bo i += ret; 1778e1f041e1SLiu Bo 17794cb5300bSChris Mason newer_off = max(newer_off + 1, 178009cbfeafSKirill A. Shutemov (u64)i << PAGE_SHIFT); 17814cb5300bSChris Mason 1782ee22184bSByongho Lee ret = find_new_extents(root, inode, newer_than, 1783ee22184bSByongho Lee &newer_off, SZ_64K); 17844cb5300bSChris Mason if (!ret) { 17854cb5300bSChris Mason range->start = newer_off; 178609cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 17874cb5300bSChris Mason } else { 17884cb5300bSChris Mason break; 1789940100a4SChris Mason } 17904cb5300bSChris Mason } else { 1791008873eaSLi Zefan if (ret > 0) { 1792cbcc8326SLi Zefan i += ret; 179309cbfeafSKirill A. Shutemov last_len += ret << PAGE_SHIFT; 1794008873eaSLi Zefan } else { 1795940100a4SChris Mason i++; 1796008873eaSLi Zefan last_len = 0; 1797008873eaSLi Zefan } 1798f46b5a66SChristoph Hellwig } 17994cb5300bSChris Mason } 1800f46b5a66SChristoph Hellwig 180150535db8STian Tao ret = defrag_count; 180250535db8STian Tao error: 1803dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 18041e701a32SChris Mason filemap_flush(inode->i_mapping); 1805dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1806dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1807dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1808dec8ef90SFilipe Manana } 18091e701a32SChris Mason 18101a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 18110b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 18125c1aab1dSNick Terrell } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) { 18135c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 18141a419d85SLi Zefan } 18151a419d85SLi Zefan 18164cb5300bSChris Mason out_ra: 18171e2ef46dSDavid Sterba if (do_compress) { 181864708539SJosef Bacik btrfs_inode_lock(inode, 0); 1819eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 182064708539SJosef Bacik btrfs_inode_unlock(inode, 0); 1821633085c7SFilipe David Borba Manana } 18221ccc2e8aSQu Wenruo if (ra_allocated) 18234cb5300bSChris Mason kfree(ra); 18244cb5300bSChris Mason kfree(pages); 1825940100a4SChris Mason return ret; 1826f46b5a66SChristoph Hellwig } 1827f46b5a66SChristoph Hellwig 182817aaa434SDavid Sterba /* 182917aaa434SDavid Sterba * Try to start exclusive operation @type or cancel it if it's running. 183017aaa434SDavid Sterba * 183117aaa434SDavid Sterba * Return: 183217aaa434SDavid Sterba * 0 - normal mode, newly claimed op started 183317aaa434SDavid Sterba * >0 - normal mode, something else is running, 183417aaa434SDavid Sterba * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space 183517aaa434SDavid Sterba * ECANCELED - cancel mode, successful cancel 183617aaa434SDavid Sterba * ENOTCONN - cancel mode, operation not running anymore 183717aaa434SDavid Sterba */ 183817aaa434SDavid Sterba static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info, 183917aaa434SDavid Sterba enum btrfs_exclusive_operation type, bool cancel) 184017aaa434SDavid Sterba { 184117aaa434SDavid Sterba if (!cancel) { 184217aaa434SDavid Sterba /* Start normal op */ 184317aaa434SDavid Sterba if (!btrfs_exclop_start(fs_info, type)) 184417aaa434SDavid Sterba return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 184517aaa434SDavid Sterba /* Exclusive operation is now claimed */ 184617aaa434SDavid Sterba return 0; 184717aaa434SDavid Sterba } 184817aaa434SDavid Sterba 184917aaa434SDavid Sterba /* Cancel running op */ 185017aaa434SDavid Sterba if (btrfs_exclop_start_try_lock(fs_info, type)) { 185117aaa434SDavid Sterba /* 185217aaa434SDavid Sterba * This blocks any exclop finish from setting it to NONE, so we 185317aaa434SDavid Sterba * request cancellation. Either it runs and we will wait for it, 185417aaa434SDavid Sterba * or it has finished and no waiting will happen. 185517aaa434SDavid Sterba */ 185617aaa434SDavid Sterba atomic_inc(&fs_info->reloc_cancel_req); 185717aaa434SDavid Sterba btrfs_exclop_start_unlock(fs_info); 185817aaa434SDavid Sterba 185917aaa434SDavid Sterba if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags)) 186017aaa434SDavid Sterba wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING, 186117aaa434SDavid Sterba TASK_INTERRUPTIBLE); 186217aaa434SDavid Sterba 186317aaa434SDavid Sterba return -ECANCELED; 186417aaa434SDavid Sterba } 186517aaa434SDavid Sterba 186617aaa434SDavid Sterba /* Something else is running or none */ 186717aaa434SDavid Sterba return -ENOTCONN; 186817aaa434SDavid Sterba } 186917aaa434SDavid Sterba 1870198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 187176dda93cSYan, Zheng void __user *arg) 1872f46b5a66SChristoph Hellwig { 18730b246afaSJeff Mahoney struct inode *inode = file_inode(file); 18740b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1875f46b5a66SChristoph Hellwig u64 new_size; 1876f46b5a66SChristoph Hellwig u64 old_size; 1877f46b5a66SChristoph Hellwig u64 devid = 1; 18780b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1879f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1880f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1881f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1882f46b5a66SChristoph Hellwig char *sizestr; 18839a40f122SGui Hecheng char *retptr; 1884f46b5a66SChristoph Hellwig char *devstr = NULL; 1885f46b5a66SChristoph Hellwig int ret = 0; 1886f46b5a66SChristoph Hellwig int mod = 0; 1887bb059a37SDavid Sterba bool cancel; 1888f46b5a66SChristoph Hellwig 1889e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1890e441d54dSChris Mason return -EPERM; 1891e441d54dSChris Mason 1892198605a8SMiao Xie ret = mnt_want_write_file(file); 1893198605a8SMiao Xie if (ret) 1894198605a8SMiao Xie return ret; 1895198605a8SMiao Xie 1896bb059a37SDavid Sterba /* 1897bb059a37SDavid Sterba * Read the arguments before checking exclusivity to be able to 1898bb059a37SDavid Sterba * distinguish regular resize and cancel 1899bb059a37SDavid Sterba */ 1900dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1901c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1902c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1903bb059a37SDavid Sterba goto out_drop; 1904c9e9f97bSIlya Dryomov } 19055516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1906f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1907bb059a37SDavid Sterba cancel = (strcmp("cancel", sizestr) == 0); 1908bb059a37SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel); 1909bb059a37SDavid Sterba if (ret) 1910bb059a37SDavid Sterba goto out_free; 1911bb059a37SDavid Sterba /* Exclusive operation is now claimed */ 1912bb059a37SDavid Sterba 1913f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1914f46b5a66SChristoph Hellwig if (devstr) { 1915f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1916f46b5a66SChristoph Hellwig *devstr = '\0'; 1917f46b5a66SChristoph Hellwig devstr = vol_args->name; 191858dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 191958dfae63SZhangZhen if (ret) 1920bb059a37SDavid Sterba goto out_finish; 1921dfd79829SMiao Xie if (!devid) { 1922dfd79829SMiao Xie ret = -EINVAL; 1923bb059a37SDavid Sterba goto out_finish; 1924dfd79829SMiao Xie } 19250b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1926f46b5a66SChristoph Hellwig } 1927dba60f3fSMiao Xie 1928b2598edfSAnand Jain device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL); 1929f46b5a66SChristoph Hellwig if (!device) { 19300b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1931c1c9ff7cSGeert Uytterhoeven devid); 1932dfd79829SMiao Xie ret = -ENODEV; 1933bb059a37SDavid Sterba goto out_finish; 1934f46b5a66SChristoph Hellwig } 1935dba60f3fSMiao Xie 1936ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 19370b246afaSJeff Mahoney btrfs_info(fs_info, 1938efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1939c1c9ff7cSGeert Uytterhoeven devid); 1940dfd79829SMiao Xie ret = -EPERM; 1941bb059a37SDavid Sterba goto out_finish; 19424e42ae1bSLiu Bo } 19434e42ae1bSLiu Bo 1944f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1945f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1946f46b5a66SChristoph Hellwig else { 1947f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1948f46b5a66SChristoph Hellwig mod = -1; 1949f46b5a66SChristoph Hellwig sizestr++; 1950f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1951f46b5a66SChristoph Hellwig mod = 1; 1952f46b5a66SChristoph Hellwig sizestr++; 1953f46b5a66SChristoph Hellwig } 19549a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 19559a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1956f46b5a66SChristoph Hellwig ret = -EINVAL; 1957bb059a37SDavid Sterba goto out_finish; 1958f46b5a66SChristoph Hellwig } 1959f46b5a66SChristoph Hellwig } 1960f46b5a66SChristoph Hellwig 1961401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1962dfd79829SMiao Xie ret = -EPERM; 1963bb059a37SDavid Sterba goto out_finish; 196463a212abSStefan Behrens } 196563a212abSStefan Behrens 19667cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1967f46b5a66SChristoph Hellwig 1968f46b5a66SChristoph Hellwig if (mod < 0) { 1969f46b5a66SChristoph Hellwig if (new_size > old_size) { 1970f46b5a66SChristoph Hellwig ret = -EINVAL; 1971bb059a37SDavid Sterba goto out_finish; 1972f46b5a66SChristoph Hellwig } 1973f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1974f46b5a66SChristoph Hellwig } else if (mod > 0) { 1975eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1976902c68a4SGui Hecheng ret = -ERANGE; 1977bb059a37SDavid Sterba goto out_finish; 1978eb8052e0SWenliang Fan } 1979f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1980f46b5a66SChristoph Hellwig } 1981f46b5a66SChristoph Hellwig 1982ee22184bSByongho Lee if (new_size < SZ_256M) { 1983f46b5a66SChristoph Hellwig ret = -EINVAL; 1984bb059a37SDavid Sterba goto out_finish; 1985f46b5a66SChristoph Hellwig } 1986f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1987f46b5a66SChristoph Hellwig ret = -EFBIG; 1988bb059a37SDavid Sterba goto out_finish; 1989f46b5a66SChristoph Hellwig } 1990f46b5a66SChristoph Hellwig 199147f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1992f46b5a66SChristoph Hellwig 1993f46b5a66SChristoph Hellwig if (new_size > old_size) { 1994a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 199598d5dc13STsutomu Itoh if (IS_ERR(trans)) { 199698d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1997bb059a37SDavid Sterba goto out_finish; 199898d5dc13STsutomu Itoh } 1999f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 20003a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 2001ece7d20eSMike Fleetwood } else if (new_size < old_size) { 2002f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 20030253f40eSjeff.liu } /* equal, nothing need to do */ 2004f46b5a66SChristoph Hellwig 2005faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 2006faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 2007faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 2008faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 2009faf8f7b9SMarcos Paulo de Souza old_size, new_size); 2010bb059a37SDavid Sterba out_finish: 2011bb059a37SDavid Sterba btrfs_exclop_finish(fs_info); 2012c9e9f97bSIlya Dryomov out_free: 2013f46b5a66SChristoph Hellwig kfree(vol_args); 2014bb059a37SDavid Sterba out_drop: 201518f39c41SIlya Dryomov mnt_drop_write_file(file); 2016f46b5a66SChristoph Hellwig return ret; 2017f46b5a66SChristoph Hellwig } 2018f46b5a66SChristoph Hellwig 20195d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 20204d4340c9SChristian Brauner struct user_namespace *mnt_userns, 202152f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 20225d54c67eSNikolay Borisov bool readonly, 20238696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 2024f46b5a66SChristoph Hellwig { 2025f46b5a66SChristoph Hellwig int namelen; 20263de4586cSChris Mason int ret = 0; 2027f46b5a66SChristoph Hellwig 2028325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 2029325c50e3SJeff Mahoney return -ENOTDIR; 2030325c50e3SJeff Mahoney 2031a874a63eSLiu Bo ret = mnt_want_write_file(file); 2032a874a63eSLiu Bo if (ret) 2033a874a63eSLiu Bo goto out; 2034a874a63eSLiu Bo 203572fd032eSSage Weil namelen = strlen(name); 203672fd032eSSage Weil if (strchr(name, '/')) { 2037f46b5a66SChristoph Hellwig ret = -EINVAL; 2038a874a63eSLiu Bo goto out_drop_write; 2039f46b5a66SChristoph Hellwig } 2040f46b5a66SChristoph Hellwig 204116780cabSChris Mason if (name[0] == '.' && 204216780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 204316780cabSChris Mason ret = -EEXIST; 2044a874a63eSLiu Bo goto out_drop_write; 204516780cabSChris Mason } 204616780cabSChris Mason 20473de4586cSChris Mason if (subvol) { 20484d4340c9SChristian Brauner ret = btrfs_mksubvol(&file->f_path, mnt_userns, name, 20494d4340c9SChristian Brauner namelen, NULL, readonly, inherit); 2050cb8e7090SChristoph Hellwig } else { 20512903ff01SAl Viro struct fd src = fdget(fd); 20523de4586cSChris Mason struct inode *src_inode; 20532903ff01SAl Viro if (!src.file) { 20543de4586cSChris Mason ret = -EINVAL; 2055a874a63eSLiu Bo goto out_drop_write; 20563de4586cSChris Mason } 20573de4586cSChris Mason 2058496ad9aaSAl Viro src_inode = file_inode(src.file); 2059496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 2060c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 2061efe120a0SFrank Holton "Snapshot src from another FS"); 206223ad5b17SKusanagi Kouichi ret = -EXDEV; 20634d4340c9SChristian Brauner } else if (!inode_owner_or_capable(mnt_userns, src_inode)) { 2064d0242061SDavid Sterba /* 2065d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 2066d0242061SDavid Sterba * are limited to own subvolumes only 2067d0242061SDavid Sterba */ 2068d0242061SDavid Sterba ret = -EPERM; 2069ecd18815SAl Viro } else { 20704d4340c9SChristian Brauner ret = btrfs_mksnapshot(&file->f_path, mnt_userns, 20714d4340c9SChristian Brauner name, namelen, 207272fd032eSSage Weil BTRFS_I(src_inode)->root, 20735d54c67eSNikolay Borisov readonly, inherit); 2074ecd18815SAl Viro } 20752903ff01SAl Viro fdput(src); 2076cb8e7090SChristoph Hellwig } 2077a874a63eSLiu Bo out_drop_write: 2078a874a63eSLiu Bo mnt_drop_write_file(file); 2079f46b5a66SChristoph Hellwig out: 208072fd032eSSage Weil return ret; 208172fd032eSSage Weil } 208272fd032eSSage Weil 208372fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 2084fa0d2b9bSLi Zefan void __user *arg, int subvol) 208572fd032eSSage Weil { 2086fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 208772fd032eSSage Weil int ret; 208872fd032eSSage Weil 2089325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 2090325c50e3SJeff Mahoney return -ENOTDIR; 2091325c50e3SJeff Mahoney 2092fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2093fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 2094fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 2095fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2096fa0d2b9bSLi Zefan 20974d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 20984d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 20994d4340c9SChristian Brauner false, NULL); 2100fa0d2b9bSLi Zefan 2101fa0d2b9bSLi Zefan kfree(vol_args); 2102fa0d2b9bSLi Zefan return ret; 2103fa0d2b9bSLi Zefan } 2104fa0d2b9bSLi Zefan 2105fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 2106fa0d2b9bSLi Zefan void __user *arg, int subvol) 2107fa0d2b9bSLi Zefan { 2108fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 2109fa0d2b9bSLi Zefan int ret; 2110b83cc969SLi Zefan bool readonly = false; 21116f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 211272fd032eSSage Weil 2113325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 2114325c50e3SJeff Mahoney return -ENOTDIR; 2115325c50e3SJeff Mahoney 2116fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2117fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 2118fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 2119fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 2120fdfb1e4fSLi Zefan 2121673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 2122b83cc969SLi Zefan ret = -EOPNOTSUPP; 2123c47ca32dSDan Carpenter goto free_args; 2124fdfb1e4fSLi Zefan } 2125fdfb1e4fSLi Zefan 2126b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 2127b83cc969SLi Zefan readonly = true; 21286f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 21295011c5a6SDan Carpenter u64 nums; 21305011c5a6SDan Carpenter 21315011c5a6SDan Carpenter if (vol_args->size < sizeof(*inherit) || 21325011c5a6SDan Carpenter vol_args->size > PAGE_SIZE) { 21336f72c7e2SArne Jansen ret = -EINVAL; 2134c47ca32dSDan Carpenter goto free_args; 21356f72c7e2SArne Jansen } 21366f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 21376f72c7e2SArne Jansen if (IS_ERR(inherit)) { 21386f72c7e2SArne Jansen ret = PTR_ERR(inherit); 2139c47ca32dSDan Carpenter goto free_args; 21406f72c7e2SArne Jansen } 21415011c5a6SDan Carpenter 21425011c5a6SDan Carpenter if (inherit->num_qgroups > PAGE_SIZE || 21435011c5a6SDan Carpenter inherit->num_ref_copies > PAGE_SIZE || 21445011c5a6SDan Carpenter inherit->num_excl_copies > PAGE_SIZE) { 21455011c5a6SDan Carpenter ret = -EINVAL; 21465011c5a6SDan Carpenter goto free_inherit; 21475011c5a6SDan Carpenter } 21485011c5a6SDan Carpenter 21495011c5a6SDan Carpenter nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + 21505011c5a6SDan Carpenter 2 * inherit->num_excl_copies; 21515011c5a6SDan Carpenter if (vol_args->size != struct_size(inherit, qgroups, nums)) { 21525011c5a6SDan Carpenter ret = -EINVAL; 21535011c5a6SDan Carpenter goto free_inherit; 21545011c5a6SDan Carpenter } 21556f72c7e2SArne Jansen } 215675eaa0e2SSage Weil 21574d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 21584d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 21594d4340c9SChristian Brauner readonly, inherit); 2160c47ca32dSDan Carpenter if (ret) 2161c47ca32dSDan Carpenter goto free_inherit; 2162c47ca32dSDan Carpenter free_inherit: 21636f72c7e2SArne Jansen kfree(inherit); 2164c47ca32dSDan Carpenter free_args: 2165c47ca32dSDan Carpenter kfree(vol_args); 2166f46b5a66SChristoph Hellwig return ret; 2167f46b5a66SChristoph Hellwig } 2168f46b5a66SChristoph Hellwig 21690caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 21700caa102dSLi Zefan void __user *arg) 21710caa102dSLi Zefan { 2172496ad9aaSAl Viro struct inode *inode = file_inode(file); 21730b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 21740caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 21750caa102dSLi Zefan int ret = 0; 21760caa102dSLi Zefan u64 flags = 0; 21770caa102dSLi Zefan 21784a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 21790caa102dSLi Zefan return -EINVAL; 21800caa102dSLi Zefan 21810b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 21820caa102dSLi Zefan if (btrfs_root_readonly(root)) 21830caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 21840b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 21850caa102dSLi Zefan 21860caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 21870caa102dSLi Zefan ret = -EFAULT; 21880caa102dSLi Zefan 21890caa102dSLi Zefan return ret; 21900caa102dSLi Zefan } 21910caa102dSLi Zefan 21920caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 21930caa102dSLi Zefan void __user *arg) 21940caa102dSLi Zefan { 2195496ad9aaSAl Viro struct inode *inode = file_inode(file); 21960b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 21970caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 21980caa102dSLi Zefan struct btrfs_trans_handle *trans; 21990caa102dSLi Zefan u64 root_flags; 22000caa102dSLi Zefan u64 flags; 22010caa102dSLi Zefan int ret = 0; 22020caa102dSLi Zefan 220339e1674fSChristian Brauner if (!inode_owner_or_capable(file_mnt_user_ns(file), inode)) 2204bd60ea0fSDavid Sterba return -EPERM; 2205bd60ea0fSDavid Sterba 2206b9ca0664SLiu Bo ret = mnt_want_write_file(file); 2207b9ca0664SLiu Bo if (ret) 2208b9ca0664SLiu Bo goto out; 22090caa102dSLi Zefan 22104a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 2211b9ca0664SLiu Bo ret = -EINVAL; 2212b9ca0664SLiu Bo goto out_drop_write; 2213b9ca0664SLiu Bo } 22140caa102dSLi Zefan 2215b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 2216b9ca0664SLiu Bo ret = -EFAULT; 2217b9ca0664SLiu Bo goto out_drop_write; 2218b9ca0664SLiu Bo } 22190caa102dSLi Zefan 2220b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 2221b9ca0664SLiu Bo ret = -EOPNOTSUPP; 2222b9ca0664SLiu Bo goto out_drop_write; 2223b9ca0664SLiu Bo } 22240caa102dSLi Zefan 22250b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 22260caa102dSLi Zefan 22270caa102dSLi Zefan /* nothing to do */ 22280caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 2229b9ca0664SLiu Bo goto out_drop_sem; 22300caa102dSLi Zefan 22310caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 22322c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 22330caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 22340caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 22352c686537SDavid Sterba } else { 22362c686537SDavid Sterba /* 22372c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 22382c686537SDavid Sterba * send 22392c686537SDavid Sterba */ 22402c686537SDavid Sterba spin_lock(&root->root_item_lock); 22412c686537SDavid Sterba if (root->send_in_progress == 0) { 22420caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 22430caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 22442c686537SDavid Sterba spin_unlock(&root->root_item_lock); 22452c686537SDavid Sterba } else { 22462c686537SDavid Sterba spin_unlock(&root->root_item_lock); 22470b246afaSJeff Mahoney btrfs_warn(fs_info, 22482c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 22492c686537SDavid Sterba root->root_key.objectid); 22502c686537SDavid Sterba ret = -EPERM; 22512c686537SDavid Sterba goto out_drop_sem; 22522c686537SDavid Sterba } 22532c686537SDavid Sterba } 22540caa102dSLi Zefan 22550caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 22560caa102dSLi Zefan if (IS_ERR(trans)) { 22570caa102dSLi Zefan ret = PTR_ERR(trans); 22580caa102dSLi Zefan goto out_reset; 22590caa102dSLi Zefan } 22600caa102dSLi Zefan 22610b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 22620caa102dSLi Zefan &root->root_key, &root->root_item); 22639417ebc8SNikolay Borisov if (ret < 0) { 22649417ebc8SNikolay Borisov btrfs_end_transaction(trans); 22659417ebc8SNikolay Borisov goto out_reset; 22669417ebc8SNikolay Borisov } 22670caa102dSLi Zefan 22689417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 22699417ebc8SNikolay Borisov 22700caa102dSLi Zefan out_reset: 22710caa102dSLi Zefan if (ret) 22720caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 2273b9ca0664SLiu Bo out_drop_sem: 22740b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 2275b9ca0664SLiu Bo out_drop_write: 2276b9ca0664SLiu Bo mnt_drop_write_file(file); 2277b9ca0664SLiu Bo out: 22780caa102dSLi Zefan return ret; 22790caa102dSLi Zefan } 22800caa102dSLi Zefan 2281ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 2282ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 2283ac8e9819SChris Mason { 2284abc6e134SChris Mason struct btrfs_key test; 2285abc6e134SChris Mason int ret; 2286abc6e134SChris Mason 2287abc6e134SChris Mason test.objectid = sk->min_objectid; 2288abc6e134SChris Mason test.type = sk->min_type; 2289abc6e134SChris Mason test.offset = sk->min_offset; 2290abc6e134SChris Mason 2291abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2292abc6e134SChris Mason if (ret < 0) 2293ac8e9819SChris Mason return 0; 2294abc6e134SChris Mason 2295abc6e134SChris Mason test.objectid = sk->max_objectid; 2296abc6e134SChris Mason test.type = sk->max_type; 2297abc6e134SChris Mason test.offset = sk->max_offset; 2298abc6e134SChris Mason 2299abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2300abc6e134SChris Mason if (ret > 0) 2301ac8e9819SChris Mason return 0; 2302ac8e9819SChris Mason return 1; 2303ac8e9819SChris Mason } 2304ac8e9819SChris Mason 2305df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2306ac8e9819SChris Mason struct btrfs_key *key, 2307ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 23089b6e817dSGerhard Heift size_t *buf_size, 2309ba346b35SGerhard Heift char __user *ubuf, 2310ac8e9819SChris Mason unsigned long *sk_offset, 2311ac8e9819SChris Mason int *num_found) 2312ac8e9819SChris Mason { 2313ac8e9819SChris Mason u64 found_transid; 2314ac8e9819SChris Mason struct extent_buffer *leaf; 2315ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2316dd81d459SNaohiro Aota struct btrfs_key test; 2317ac8e9819SChris Mason unsigned long item_off; 2318ac8e9819SChris Mason unsigned long item_len; 2319ac8e9819SChris Mason int nritems; 2320ac8e9819SChris Mason int i; 2321ac8e9819SChris Mason int slot; 2322ac8e9819SChris Mason int ret = 0; 2323ac8e9819SChris Mason 2324ac8e9819SChris Mason leaf = path->nodes[0]; 2325ac8e9819SChris Mason slot = path->slots[0]; 2326ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2327ac8e9819SChris Mason 2328ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2329ac8e9819SChris Mason i = nritems; 2330ac8e9819SChris Mason goto advance_key; 2331ac8e9819SChris Mason } 2332ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2333ac8e9819SChris Mason 2334ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2335ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 2336ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 2337ac8e9819SChris Mason 233803b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 233903b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 234003b71c6cSGabriel de Perthuis continue; 234103b71c6cSGabriel de Perthuis 23429b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 23438f5f6178SGerhard Heift if (*num_found) { 2344ac8e9819SChris Mason ret = 1; 23458f5f6178SGerhard Heift goto out; 23468f5f6178SGerhard Heift } 23478f5f6178SGerhard Heift 23488f5f6178SGerhard Heift /* 23498f5f6178SGerhard Heift * return one empty item back for v1, which does not 23508f5f6178SGerhard Heift * handle -EOVERFLOW 23518f5f6178SGerhard Heift */ 23528f5f6178SGerhard Heift 23539b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2354ac8e9819SChris Mason item_len = 0; 23558f5f6178SGerhard Heift ret = -EOVERFLOW; 23568f5f6178SGerhard Heift } 2357ac8e9819SChris Mason 23589b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2359ac8e9819SChris Mason ret = 1; 236025c9bc2eSGerhard Heift goto out; 2361ac8e9819SChris Mason } 2362ac8e9819SChris Mason 2363ac8e9819SChris Mason sh.objectid = key->objectid; 2364ac8e9819SChris Mason sh.offset = key->offset; 2365ac8e9819SChris Mason sh.type = key->type; 2366ac8e9819SChris Mason sh.len = item_len; 2367ac8e9819SChris Mason sh.transid = found_transid; 2368ac8e9819SChris Mason 2369a48b73ecSJosef Bacik /* 2370a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 2371a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 2372a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 2373a48b73ecSJosef Bacik * properly this next time through 2374a48b73ecSJosef Bacik */ 2375a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 2376a48b73ecSJosef Bacik ret = 0; 2377ba346b35SGerhard Heift goto out; 2378ba346b35SGerhard Heift } 2379ba346b35SGerhard Heift 2380ac8e9819SChris Mason *sk_offset += sizeof(sh); 2381ac8e9819SChris Mason 2382ac8e9819SChris Mason if (item_len) { 2383ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2384a48b73ecSJosef Bacik /* 2385a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 2386a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 2387a48b73ecSJosef Bacik */ 2388a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 2389ba346b35SGerhard Heift item_off, item_len)) { 2390a48b73ecSJosef Bacik ret = 0; 2391a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 2392ba346b35SGerhard Heift goto out; 2393ba346b35SGerhard Heift } 2394ba346b35SGerhard Heift 2395ac8e9819SChris Mason *sk_offset += item_len; 2396ac8e9819SChris Mason } 2397e2156867SHugo Mills (*num_found)++; 2398ac8e9819SChris Mason 23998f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 24008f5f6178SGerhard Heift goto out; 24018f5f6178SGerhard Heift 240225c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 240325c9bc2eSGerhard Heift ret = 1; 240425c9bc2eSGerhard Heift goto out; 240525c9bc2eSGerhard Heift } 2406ac8e9819SChris Mason } 2407ac8e9819SChris Mason advance_key: 2408ac8e9819SChris Mason ret = 0; 2409dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2410dd81d459SNaohiro Aota test.type = sk->max_type; 2411dd81d459SNaohiro Aota test.offset = sk->max_offset; 2412dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2413dd81d459SNaohiro Aota ret = 1; 2414dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2415abc6e134SChris Mason key->offset++; 2416dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2417abc6e134SChris Mason key->offset = 0; 2418abc6e134SChris Mason key->type++; 2419dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2420abc6e134SChris Mason key->offset = 0; 2421abc6e134SChris Mason key->type = 0; 2422abc6e134SChris Mason key->objectid++; 2423abc6e134SChris Mason } else 2424abc6e134SChris Mason ret = 1; 242525c9bc2eSGerhard Heift out: 2426ba346b35SGerhard Heift /* 2427ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2428ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2429ba346b35SGerhard Heift * * all items were found 2430ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2431ba346b35SGerhard Heift * leaf 2432ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2433ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2434ba346b35SGerhard Heift */ 2435ac8e9819SChris Mason return ret; 2436ac8e9819SChris Mason } 2437ac8e9819SChris Mason 2438ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 243912544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 24409b6e817dSGerhard Heift size_t *buf_size, 2441ba346b35SGerhard Heift char __user *ubuf) 2442ac8e9819SChris Mason { 24430b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2444ac8e9819SChris Mason struct btrfs_root *root; 2445ac8e9819SChris Mason struct btrfs_key key; 2446ac8e9819SChris Mason struct btrfs_path *path; 2447ac8e9819SChris Mason int ret; 2448ac8e9819SChris Mason int num_found = 0; 2449ac8e9819SChris Mason unsigned long sk_offset = 0; 2450ac8e9819SChris Mason 24519b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 24529b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 245312544442SGerhard Heift return -EOVERFLOW; 24549b6e817dSGerhard Heift } 245512544442SGerhard Heift 2456ac8e9819SChris Mason path = btrfs_alloc_path(); 2457ac8e9819SChris Mason if (!path) 2458ac8e9819SChris Mason return -ENOMEM; 2459ac8e9819SChris Mason 2460ac8e9819SChris Mason if (sk->tree_id == 0) { 2461ac8e9819SChris Mason /* search the root of the inode that was passed */ 246200246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2463ac8e9819SChris Mason } else { 246456e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2465ac8e9819SChris Mason if (IS_ERR(root)) { 2466ac8e9819SChris Mason btrfs_free_path(path); 2467ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2468ac8e9819SChris Mason } 2469ac8e9819SChris Mason } 2470ac8e9819SChris Mason 2471ac8e9819SChris Mason key.objectid = sk->min_objectid; 2472ac8e9819SChris Mason key.type = sk->min_type; 2473ac8e9819SChris Mason key.offset = sk->min_offset; 2474ac8e9819SChris Mason 2475ac8e9819SChris Mason while (1) { 24761c78544eSFilipe Manana ret = fault_in_pages_writeable(ubuf + sk_offset, 24771c78544eSFilipe Manana *buf_size - sk_offset); 2478a48b73ecSJosef Bacik if (ret) 2479a48b73ecSJosef Bacik break; 2480a48b73ecSJosef Bacik 24816174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2482ac8e9819SChris Mason if (ret != 0) { 2483ac8e9819SChris Mason if (ret > 0) 2484ac8e9819SChris Mason ret = 0; 2485ac8e9819SChris Mason goto err; 2486ac8e9819SChris Mason } 2487df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2488ac8e9819SChris Mason &sk_offset, &num_found); 2489b3b4aa74SDavid Sterba btrfs_release_path(path); 249025c9bc2eSGerhard Heift if (ret) 2491ac8e9819SChris Mason break; 2492ac8e9819SChris Mason 2493ac8e9819SChris Mason } 24948f5f6178SGerhard Heift if (ret > 0) 2495ac8e9819SChris Mason ret = 0; 2496ac8e9819SChris Mason err: 2497ac8e9819SChris Mason sk->nr_items = num_found; 249800246528SJosef Bacik btrfs_put_root(root); 2499ac8e9819SChris Mason btrfs_free_path(path); 2500ac8e9819SChris Mason return ret; 2501ac8e9819SChris Mason } 2502ac8e9819SChris Mason 2503ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2504ac8e9819SChris Mason void __user *argp) 2505ac8e9819SChris Mason { 2506ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2507ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2508ac8e9819SChris Mason struct inode *inode; 2509ac8e9819SChris Mason int ret; 25109b6e817dSGerhard Heift size_t buf_size; 2511ac8e9819SChris Mason 2512ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2513ac8e9819SChris Mason return -EPERM; 2514ac8e9819SChris Mason 2515ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2516ac8e9819SChris Mason 2517ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2518ba346b35SGerhard Heift return -EFAULT; 2519ba346b35SGerhard Heift 2520ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2521ac8e9819SChris Mason 2522496ad9aaSAl Viro inode = file_inode(file); 2523ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 25248f5f6178SGerhard Heift 25258f5f6178SGerhard Heift /* 25268f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 25278f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 25288f5f6178SGerhard Heift */ 25298f5f6178SGerhard Heift if (ret == -EOVERFLOW) 25308f5f6178SGerhard Heift ret = 0; 25318f5f6178SGerhard Heift 2532ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2533ac8e9819SChris Mason ret = -EFAULT; 2534ac8e9819SChris Mason return ret; 2535ac8e9819SChris Mason } 2536ac8e9819SChris Mason 2537cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2538cc68a8a5SGerhard Heift void __user *argp) 2539cc68a8a5SGerhard Heift { 2540cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2541cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2542cc68a8a5SGerhard Heift struct inode *inode; 2543cc68a8a5SGerhard Heift int ret; 2544cc68a8a5SGerhard Heift size_t buf_size; 2545ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2546cc68a8a5SGerhard Heift 2547cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2548cc68a8a5SGerhard Heift return -EPERM; 2549cc68a8a5SGerhard Heift 2550cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2551cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2552cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2553cc68a8a5SGerhard Heift return -EFAULT; 2554cc68a8a5SGerhard Heift 2555cc68a8a5SGerhard Heift buf_size = args.buf_size; 2556cc68a8a5SGerhard Heift 2557cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2558cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2559cc68a8a5SGerhard Heift buf_size = buf_limit; 2560cc68a8a5SGerhard Heift 2561cc68a8a5SGerhard Heift inode = file_inode(file); 2562cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2563718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2564cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2565cc68a8a5SGerhard Heift ret = -EFAULT; 2566cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2567cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2568cc68a8a5SGerhard Heift ret = -EFAULT; 2569cc68a8a5SGerhard Heift 257076dda93cSYan, Zheng return ret; 257176dda93cSYan, Zheng } 257276dda93cSYan, Zheng 257398d377a0STARUISI Hiroaki /* 2574ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2575ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 257698d377a0STARUISI Hiroaki */ 257798d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 257898d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 257998d377a0STARUISI Hiroaki { 258098d377a0STARUISI Hiroaki struct btrfs_root *root; 258198d377a0STARUISI Hiroaki struct btrfs_key key; 2582ac8e9819SChris Mason char *ptr; 258398d377a0STARUISI Hiroaki int ret = -1; 258498d377a0STARUISI Hiroaki int slot; 258598d377a0STARUISI Hiroaki int len; 258698d377a0STARUISI Hiroaki int total_len = 0; 258798d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 258898d377a0STARUISI Hiroaki struct extent_buffer *l; 258998d377a0STARUISI Hiroaki struct btrfs_path *path; 259098d377a0STARUISI Hiroaki 259198d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 259298d377a0STARUISI Hiroaki name[0]='\0'; 259398d377a0STARUISI Hiroaki return 0; 259498d377a0STARUISI Hiroaki } 259598d377a0STARUISI Hiroaki 259698d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 259798d377a0STARUISI Hiroaki if (!path) 259898d377a0STARUISI Hiroaki return -ENOMEM; 259998d377a0STARUISI Hiroaki 2600c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 260198d377a0STARUISI Hiroaki 260256e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 260398d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2604ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 260588234012SJosef Bacik root = NULL; 260688234012SJosef Bacik goto out; 260788234012SJosef Bacik } 260898d377a0STARUISI Hiroaki 260998d377a0STARUISI Hiroaki key.objectid = dirid; 261098d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 26118ad6fcabSChris Mason key.offset = (u64)-1; 261298d377a0STARUISI Hiroaki 261398d377a0STARUISI Hiroaki while (1) { 26140ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 261518674c6cSFilipe David Borba Manana if (ret < 0) 261618674c6cSFilipe David Borba Manana goto out; 261718674c6cSFilipe David Borba Manana else if (ret > 0) { 2618ac8e9819SChris Mason ret = -ENOENT; 261998d377a0STARUISI Hiroaki goto out; 2620ac8e9819SChris Mason } 262118674c6cSFilipe David Borba Manana 262218674c6cSFilipe David Borba Manana l = path->nodes[0]; 262318674c6cSFilipe David Borba Manana slot = path->slots[0]; 262498d377a0STARUISI Hiroaki 262598d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 262698d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 262798d377a0STARUISI Hiroaki ptr -= len + 1; 262898d377a0STARUISI Hiroaki total_len += len + 1; 2629a696cf35SFilipe David Borba Manana if (ptr < name) { 2630a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 263198d377a0STARUISI Hiroaki goto out; 2632a696cf35SFilipe David Borba Manana } 263398d377a0STARUISI Hiroaki 263498d377a0STARUISI Hiroaki *(ptr + len) = '/'; 263598d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 263698d377a0STARUISI Hiroaki 263798d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 263898d377a0STARUISI Hiroaki break; 263998d377a0STARUISI Hiroaki 2640b3b4aa74SDavid Sterba btrfs_release_path(path); 264198d377a0STARUISI Hiroaki key.objectid = key.offset; 26428ad6fcabSChris Mason key.offset = (u64)-1; 264398d377a0STARUISI Hiroaki dirid = key.objectid; 264498d377a0STARUISI Hiroaki } 264577906a50SLi Zefan memmove(name, ptr, total_len); 264698d377a0STARUISI Hiroaki name[total_len] = '\0'; 264798d377a0STARUISI Hiroaki ret = 0; 264898d377a0STARUISI Hiroaki out: 264900246528SJosef Bacik btrfs_put_root(root); 265098d377a0STARUISI Hiroaki btrfs_free_path(path); 2651ac8e9819SChris Mason return ret; 2652ac8e9819SChris Mason } 2653ac8e9819SChris Mason 26546623d9a0SChristian Brauner static int btrfs_search_path_in_tree_user(struct user_namespace *mnt_userns, 26556623d9a0SChristian Brauner struct inode *inode, 265623d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 265723d0b79dSTomohiro Misono { 265823d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 265923d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 266023d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 266123d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 266223d0b79dSTomohiro Misono u64 dirid = args->dirid; 266323d0b79dSTomohiro Misono unsigned long item_off; 266423d0b79dSTomohiro Misono unsigned long item_len; 266523d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 266623d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2667b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 266823d0b79dSTomohiro Misono struct btrfs_path *path; 266923d0b79dSTomohiro Misono struct btrfs_key key, key2; 267023d0b79dSTomohiro Misono struct extent_buffer *leaf; 267123d0b79dSTomohiro Misono struct inode *temp_inode; 267223d0b79dSTomohiro Misono char *ptr; 267323d0b79dSTomohiro Misono int slot; 267423d0b79dSTomohiro Misono int len; 267523d0b79dSTomohiro Misono int total_len = 0; 267623d0b79dSTomohiro Misono int ret; 267723d0b79dSTomohiro Misono 267823d0b79dSTomohiro Misono path = btrfs_alloc_path(); 267923d0b79dSTomohiro Misono if (!path) 268023d0b79dSTomohiro Misono return -ENOMEM; 268123d0b79dSTomohiro Misono 268223d0b79dSTomohiro Misono /* 268323d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 268423d0b79dSTomohiro Misono * construct the path in from the bottom up. 268523d0b79dSTomohiro Misono */ 268623d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 268723d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 268823d0b79dSTomohiro Misono 268956e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 269023d0b79dSTomohiro Misono if (IS_ERR(root)) { 269123d0b79dSTomohiro Misono ret = PTR_ERR(root); 269223d0b79dSTomohiro Misono goto out; 269323d0b79dSTomohiro Misono } 269423d0b79dSTomohiro Misono 269523d0b79dSTomohiro Misono key.objectid = dirid; 269623d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 269723d0b79dSTomohiro Misono key.offset = (u64)-1; 269823d0b79dSTomohiro Misono while (1) { 26990ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 27000ff40a91SMarcos Paulo de Souza if (ret < 0) 2701b8a49ae1SJosef Bacik goto out_put; 27020ff40a91SMarcos Paulo de Souza else if (ret > 0) { 270323d0b79dSTomohiro Misono ret = -ENOENT; 2704b8a49ae1SJosef Bacik goto out_put; 270523d0b79dSTomohiro Misono } 270623d0b79dSTomohiro Misono 270723d0b79dSTomohiro Misono leaf = path->nodes[0]; 270823d0b79dSTomohiro Misono slot = path->slots[0]; 270923d0b79dSTomohiro Misono 271023d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 271123d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 271223d0b79dSTomohiro Misono ptr -= len + 1; 271323d0b79dSTomohiro Misono total_len += len + 1; 271423d0b79dSTomohiro Misono if (ptr < args->path) { 271523d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2716b8a49ae1SJosef Bacik goto out_put; 271723d0b79dSTomohiro Misono } 271823d0b79dSTomohiro Misono 271923d0b79dSTomohiro Misono *(ptr + len) = '/'; 272023d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 272123d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 272223d0b79dSTomohiro Misono 272323d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 272423d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 272523d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 272623d0b79dSTomohiro Misono if (ret < 0) { 2727b8a49ae1SJosef Bacik goto out_put; 272823d0b79dSTomohiro Misono } else if (ret > 0) { 272923d0b79dSTomohiro Misono ret = -ENOENT; 2730b8a49ae1SJosef Bacik goto out_put; 273123d0b79dSTomohiro Misono } 273223d0b79dSTomohiro Misono 273323d0b79dSTomohiro Misono leaf = path->nodes[0]; 273423d0b79dSTomohiro Misono slot = path->slots[0]; 273523d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 273623d0b79dSTomohiro Misono if (key2.objectid != dirid) { 273723d0b79dSTomohiro Misono ret = -ENOENT; 2738b8a49ae1SJosef Bacik goto out_put; 273923d0b79dSTomohiro Misono } 274023d0b79dSTomohiro Misono 27410202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 27423ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 27433ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2744b8a49ae1SJosef Bacik goto out_put; 27453ca57bd6SMisono Tomohiro } 27466623d9a0SChristian Brauner ret = inode_permission(mnt_userns, temp_inode, 274747291baaSChristian Brauner MAY_READ | MAY_EXEC); 274823d0b79dSTomohiro Misono iput(temp_inode); 274923d0b79dSTomohiro Misono if (ret) { 275023d0b79dSTomohiro Misono ret = -EACCES; 2751b8a49ae1SJosef Bacik goto out_put; 275223d0b79dSTomohiro Misono } 275323d0b79dSTomohiro Misono 275423d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 275523d0b79dSTomohiro Misono break; 275623d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 275723d0b79dSTomohiro Misono ret = -EACCES; 2758b8a49ae1SJosef Bacik goto out_put; 275923d0b79dSTomohiro Misono } 276023d0b79dSTomohiro Misono 276123d0b79dSTomohiro Misono btrfs_release_path(path); 276223d0b79dSTomohiro Misono key.objectid = key.offset; 276323d0b79dSTomohiro Misono key.offset = (u64)-1; 276423d0b79dSTomohiro Misono dirid = key.objectid; 276523d0b79dSTomohiro Misono } 276623d0b79dSTomohiro Misono 276723d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 276823d0b79dSTomohiro Misono args->path[total_len] = '\0'; 276900246528SJosef Bacik btrfs_put_root(root); 2770b8a49ae1SJosef Bacik root = NULL; 277123d0b79dSTomohiro Misono btrfs_release_path(path); 277223d0b79dSTomohiro Misono } 277323d0b79dSTomohiro Misono 277423d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 277523d0b79dSTomohiro Misono key.objectid = treeid; 277623d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 277723d0b79dSTomohiro Misono key.offset = args->treeid; 2778b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 277923d0b79dSTomohiro Misono if (ret < 0) { 278023d0b79dSTomohiro Misono goto out; 278123d0b79dSTomohiro Misono } else if (ret > 0) { 278223d0b79dSTomohiro Misono ret = -ENOENT; 278323d0b79dSTomohiro Misono goto out; 278423d0b79dSTomohiro Misono } 278523d0b79dSTomohiro Misono 278623d0b79dSTomohiro Misono leaf = path->nodes[0]; 278723d0b79dSTomohiro Misono slot = path->slots[0]; 278823d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 278923d0b79dSTomohiro Misono 279023d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 279123d0b79dSTomohiro Misono item_len = btrfs_item_size_nr(leaf, slot); 279223d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 279323d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 279423d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 279523d0b79dSTomohiro Misono ret = -EINVAL; 279623d0b79dSTomohiro Misono goto out; 279723d0b79dSTomohiro Misono } 279823d0b79dSTomohiro Misono 279923d0b79dSTomohiro Misono /* Copy subvolume's name */ 280023d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 280123d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 280223d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 280323d0b79dSTomohiro Misono args->name[item_len] = 0; 280423d0b79dSTomohiro Misono 2805b8a49ae1SJosef Bacik out_put: 280600246528SJosef Bacik btrfs_put_root(root); 280723d0b79dSTomohiro Misono out: 280823d0b79dSTomohiro Misono btrfs_free_path(path); 280923d0b79dSTomohiro Misono return ret; 281023d0b79dSTomohiro Misono } 281123d0b79dSTomohiro Misono 2812ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2813ac8e9819SChris Mason void __user *argp) 2814ac8e9819SChris Mason { 2815ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2816ac8e9819SChris Mason struct inode *inode; 281701b810b8SDavid Sterba int ret = 0; 2818ac8e9819SChris Mason 28192354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 28202354d08fSJulia Lawall if (IS_ERR(args)) 28212354d08fSJulia Lawall return PTR_ERR(args); 2822c2b96929SDan Carpenter 2823496ad9aaSAl Viro inode = file_inode(file); 2824ac8e9819SChris Mason 282501b810b8SDavid Sterba /* 282601b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 282701b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 282801b810b8SDavid Sterba */ 28291b53ac4dSChris Mason if (args->treeid == 0) 28301b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 28311b53ac4dSChris Mason 283201b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 283301b810b8SDavid Sterba args->name[0] = 0; 283401b810b8SDavid Sterba goto out; 283501b810b8SDavid Sterba } 283601b810b8SDavid Sterba 283701b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 283801b810b8SDavid Sterba ret = -EPERM; 283901b810b8SDavid Sterba goto out; 284001b810b8SDavid Sterba } 284101b810b8SDavid Sterba 2842ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2843ac8e9819SChris Mason args->treeid, args->objectid, 2844ac8e9819SChris Mason args->name); 2845ac8e9819SChris Mason 284601b810b8SDavid Sterba out: 2847ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2848ac8e9819SChris Mason ret = -EFAULT; 2849ac8e9819SChris Mason 2850ac8e9819SChris Mason kfree(args); 285198d377a0STARUISI Hiroaki return ret; 285298d377a0STARUISI Hiroaki } 285398d377a0STARUISI Hiroaki 285423d0b79dSTomohiro Misono /* 285523d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 285623d0b79dSTomohiro Misono * 285723d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 285823d0b79dSTomohiro Misono * 285923d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 286023d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 286123d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 286223d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 286323d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 286423d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 286523d0b79dSTomohiro Misono */ 286623d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 286723d0b79dSTomohiro Misono { 286823d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 286923d0b79dSTomohiro Misono struct inode *inode; 287023d0b79dSTomohiro Misono int ret; 287123d0b79dSTomohiro Misono 287223d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 287323d0b79dSTomohiro Misono if (IS_ERR(args)) 287423d0b79dSTomohiro Misono return PTR_ERR(args); 287523d0b79dSTomohiro Misono 287623d0b79dSTomohiro Misono inode = file_inode(file); 287723d0b79dSTomohiro Misono 287823d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 287923d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 288023d0b79dSTomohiro Misono /* 288123d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 288223d0b79dSTomohiro Misono * called 288323d0b79dSTomohiro Misono */ 288423d0b79dSTomohiro Misono kfree(args); 288523d0b79dSTomohiro Misono return -EACCES; 288623d0b79dSTomohiro Misono } 288723d0b79dSTomohiro Misono 28886623d9a0SChristian Brauner ret = btrfs_search_path_in_tree_user(file_mnt_user_ns(file), inode, args); 288923d0b79dSTomohiro Misono 289023d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 289123d0b79dSTomohiro Misono ret = -EFAULT; 289223d0b79dSTomohiro Misono 289323d0b79dSTomohiro Misono kfree(args); 289423d0b79dSTomohiro Misono return ret; 289523d0b79dSTomohiro Misono } 289623d0b79dSTomohiro Misono 2897b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 2898b64ec075STomohiro Misono static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) 2899b64ec075STomohiro Misono { 2900b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2901b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2902b64ec075STomohiro Misono struct btrfs_root *root; 2903b64ec075STomohiro Misono struct btrfs_path *path; 2904b64ec075STomohiro Misono struct btrfs_key key; 2905b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2906b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2907b64ec075STomohiro Misono struct extent_buffer *leaf; 2908b64ec075STomohiro Misono unsigned long item_off; 2909b64ec075STomohiro Misono unsigned long item_len; 2910b64ec075STomohiro Misono struct inode *inode; 2911b64ec075STomohiro Misono int slot; 2912b64ec075STomohiro Misono int ret = 0; 2913b64ec075STomohiro Misono 2914b64ec075STomohiro Misono path = btrfs_alloc_path(); 2915b64ec075STomohiro Misono if (!path) 2916b64ec075STomohiro Misono return -ENOMEM; 2917b64ec075STomohiro Misono 2918b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2919b64ec075STomohiro Misono if (!subvol_info) { 2920b64ec075STomohiro Misono btrfs_free_path(path); 2921b64ec075STomohiro Misono return -ENOMEM; 2922b64ec075STomohiro Misono } 2923b64ec075STomohiro Misono 2924b64ec075STomohiro Misono inode = file_inode(file); 2925b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2926b64ec075STomohiro Misono 2927b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2928b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 292956e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2930b64ec075STomohiro Misono if (IS_ERR(root)) { 2931b64ec075STomohiro Misono ret = PTR_ERR(root); 293204734e84SJosef Bacik goto out_free; 293304734e84SJosef Bacik } 2934b64ec075STomohiro Misono root_item = &root->root_item; 2935b64ec075STomohiro Misono 2936b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2937b64ec075STomohiro Misono 2938b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2939b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2940b64ec075STomohiro Misono 2941b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2942b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2943b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2944b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2945b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2946b64ec075STomohiro Misono 2947b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2948b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2949b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2950b64ec075STomohiro Misono 2951b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2952b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2953b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2954b64ec075STomohiro Misono 2955b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2956b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2957b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2958b64ec075STomohiro Misono 2959b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2960b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2961b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2962b64ec075STomohiro Misono 2963b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2964b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2965b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2966b64ec075STomohiro Misono key.offset = 0; 296704734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2968b64ec075STomohiro Misono if (ret < 0) { 2969b64ec075STomohiro Misono goto out; 2970b64ec075STomohiro Misono } else if (path->slots[0] >= 2971b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 297204734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2973b64ec075STomohiro Misono if (ret < 0) { 2974b64ec075STomohiro Misono goto out; 2975b64ec075STomohiro Misono } else if (ret > 0) { 2976b64ec075STomohiro Misono ret = -EUCLEAN; 2977b64ec075STomohiro Misono goto out; 2978b64ec075STomohiro Misono } 2979b64ec075STomohiro Misono } 2980b64ec075STomohiro Misono 2981b64ec075STomohiro Misono leaf = path->nodes[0]; 2982b64ec075STomohiro Misono slot = path->slots[0]; 2983b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2984b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2985b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2986b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2987b64ec075STomohiro Misono 2988b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2989b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2990b64ec075STomohiro Misono 2991b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2992b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 2993b64ec075STomohiro Misono item_len = btrfs_item_size_nr(leaf, slot) 2994b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2995b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2996b64ec075STomohiro Misono item_off, item_len); 2997b64ec075STomohiro Misono } else { 2998b64ec075STomohiro Misono ret = -ENOENT; 2999b64ec075STomohiro Misono goto out; 3000b64ec075STomohiro Misono } 3001b64ec075STomohiro Misono } 3002b64ec075STomohiro Misono 3003b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 3004b64ec075STomohiro Misono ret = -EFAULT; 3005b64ec075STomohiro Misono 3006b64ec075STomohiro Misono out: 300700246528SJosef Bacik btrfs_put_root(root); 300804734e84SJosef Bacik out_free: 3009b64ec075STomohiro Misono btrfs_free_path(path); 3010b091f7feSWaiman Long kfree(subvol_info); 3011b64ec075STomohiro Misono return ret; 3012b64ec075STomohiro Misono } 3013b64ec075STomohiro Misono 301442e4b520STomohiro Misono /* 301542e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 301642e4b520STomohiro Misono * except the subvolume name. 301742e4b520STomohiro Misono */ 301842e4b520STomohiro Misono static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp) 301942e4b520STomohiro Misono { 302042e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 302142e4b520STomohiro Misono struct btrfs_root_ref *rref; 302242e4b520STomohiro Misono struct btrfs_root *root; 302342e4b520STomohiro Misono struct btrfs_path *path; 302442e4b520STomohiro Misono struct btrfs_key key; 302542e4b520STomohiro Misono struct extent_buffer *leaf; 302642e4b520STomohiro Misono struct inode *inode; 302742e4b520STomohiro Misono u64 objectid; 302842e4b520STomohiro Misono int slot; 302942e4b520STomohiro Misono int ret; 303042e4b520STomohiro Misono u8 found; 303142e4b520STomohiro Misono 303242e4b520STomohiro Misono path = btrfs_alloc_path(); 303342e4b520STomohiro Misono if (!path) 303442e4b520STomohiro Misono return -ENOMEM; 303542e4b520STomohiro Misono 303642e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 303742e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 303842e4b520STomohiro Misono btrfs_free_path(path); 303942e4b520STomohiro Misono return PTR_ERR(rootrefs); 304042e4b520STomohiro Misono } 304142e4b520STomohiro Misono 304242e4b520STomohiro Misono inode = file_inode(file); 304342e4b520STomohiro Misono root = BTRFS_I(inode)->root->fs_info->tree_root; 304442e4b520STomohiro Misono objectid = BTRFS_I(inode)->root->root_key.objectid; 304542e4b520STomohiro Misono 304642e4b520STomohiro Misono key.objectid = objectid; 304742e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 304842e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 304942e4b520STomohiro Misono found = 0; 305042e4b520STomohiro Misono 305142e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 305242e4b520STomohiro Misono if (ret < 0) { 305342e4b520STomohiro Misono goto out; 305442e4b520STomohiro Misono } else if (path->slots[0] >= 305542e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 305642e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 305742e4b520STomohiro Misono if (ret < 0) { 305842e4b520STomohiro Misono goto out; 305942e4b520STomohiro Misono } else if (ret > 0) { 306042e4b520STomohiro Misono ret = -EUCLEAN; 306142e4b520STomohiro Misono goto out; 306242e4b520STomohiro Misono } 306342e4b520STomohiro Misono } 306442e4b520STomohiro Misono while (1) { 306542e4b520STomohiro Misono leaf = path->nodes[0]; 306642e4b520STomohiro Misono slot = path->slots[0]; 306742e4b520STomohiro Misono 306842e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 306942e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 307042e4b520STomohiro Misono ret = 0; 307142e4b520STomohiro Misono goto out; 307242e4b520STomohiro Misono } 307342e4b520STomohiro Misono 307442e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 307542e4b520STomohiro Misono ret = -EOVERFLOW; 307642e4b520STomohiro Misono goto out; 307742e4b520STomohiro Misono } 307842e4b520STomohiro Misono 307942e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 308042e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 308142e4b520STomohiro Misono rootrefs->rootref[found].dirid = 308242e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 308342e4b520STomohiro Misono found++; 308442e4b520STomohiro Misono 308542e4b520STomohiro Misono ret = btrfs_next_item(root, path); 308642e4b520STomohiro Misono if (ret < 0) { 308742e4b520STomohiro Misono goto out; 308842e4b520STomohiro Misono } else if (ret > 0) { 308942e4b520STomohiro Misono ret = -EUCLEAN; 309042e4b520STomohiro Misono goto out; 309142e4b520STomohiro Misono } 309242e4b520STomohiro Misono } 309342e4b520STomohiro Misono 309442e4b520STomohiro Misono out: 309542e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 309642e4b520STomohiro Misono rootrefs->num_items = found; 309742e4b520STomohiro Misono /* update min_treeid for next search */ 309842e4b520STomohiro Misono if (found) 309942e4b520STomohiro Misono rootrefs->min_treeid = 310042e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 310142e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 310242e4b520STomohiro Misono ret = -EFAULT; 310342e4b520STomohiro Misono } 310442e4b520STomohiro Misono 310542e4b520STomohiro Misono kfree(rootrefs); 310642e4b520STomohiro Misono btrfs_free_path(path); 310742e4b520STomohiro Misono 310842e4b520STomohiro Misono return ret; 310942e4b520STomohiro Misono } 311042e4b520STomohiro Misono 311176dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 3112949964c9SMarcos Paulo de Souza void __user *arg, 3113949964c9SMarcos Paulo de Souza bool destroy_v2) 311476dda93cSYan, Zheng { 311554563d41SAl Viro struct dentry *parent = file->f_path.dentry; 31160b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 311776dda93cSYan, Zheng struct dentry *dentry; 31182b0143b5SDavid Howells struct inode *dir = d_inode(parent); 311976dda93cSYan, Zheng struct inode *inode; 312076dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 312176dda93cSYan, Zheng struct btrfs_root *dest = NULL; 3122949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 3123949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 3124c4ed533bSChristian Brauner struct user_namespace *mnt_userns = file_mnt_user_ns(file); 3125949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 3126949964c9SMarcos Paulo de Souza int subvol_namelen; 312776dda93cSYan, Zheng int err = 0; 3128949964c9SMarcos Paulo de Souza bool destroy_parent = false; 312976dda93cSYan, Zheng 3130949964c9SMarcos Paulo de Souza if (destroy_v2) { 3131949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 3132949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 3133949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 3134325c50e3SJeff Mahoney 3135949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 3136949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 3137949964c9SMarcos Paulo de Souza goto out; 3138949964c9SMarcos Paulo de Souza } 313976dda93cSYan, Zheng 3140949964c9SMarcos Paulo de Souza /* 3141949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 3142949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 3143949964c9SMarcos Paulo de Souza */ 3144949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 3145949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 3146949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 3147949964c9SMarcos Paulo de Souza 3148949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3149949964c9SMarcos Paulo de Souza if (err) 3150949964c9SMarcos Paulo de Souza goto out; 3151949964c9SMarcos Paulo de Souza } else { 3152aabb34e7SChristian Brauner struct inode *old_dir; 3153c4ed533bSChristian Brauner 3154949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 315576dda93cSYan, Zheng err = -EINVAL; 315676dda93cSYan, Zheng goto out; 315776dda93cSYan, Zheng } 315876dda93cSYan, Zheng 3159a561be71SAl Viro err = mnt_want_write_file(file); 316076dda93cSYan, Zheng if (err) 316176dda93cSYan, Zheng goto out; 316276dda93cSYan, Zheng 3163949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 3164949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 3165949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 3166949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 3167949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 3168949964c9SMarcos Paulo de Souza goto out_drop_write; 3169949964c9SMarcos Paulo de Souza } 3170949964c9SMarcos Paulo de Souza 3171949964c9SMarcos Paulo de Souza /* 3172949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 3173949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 3174949964c9SMarcos Paulo de Souza */ 3175949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 3176949964c9SMarcos Paulo de Souza 3177949964c9SMarcos Paulo de Souza /* 3178949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 3179949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 3180949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 3181949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 3182949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 3183949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 3184949964c9SMarcos Paulo de Souza */ 3185949964c9SMarcos Paulo de Souza dput(dentry); 3186949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 3187949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 3188949964c9SMarcos Paulo de Souza goto out_drop_write; 3189949964c9SMarcos Paulo de Souza } 3190aabb34e7SChristian Brauner old_dir = dir; 3191949964c9SMarcos Paulo de Souza dir = d_inode(parent); 3192949964c9SMarcos Paulo de Souza 3193949964c9SMarcos Paulo de Souza /* 3194949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 3195949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 3196949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 3197949964c9SMarcos Paulo de Souza * new parent dentry. 3198949964c9SMarcos Paulo de Souza */ 3199949964c9SMarcos Paulo de Souza destroy_parent = true; 3200949964c9SMarcos Paulo de Souza 3201aabb34e7SChristian Brauner /* 3202aabb34e7SChristian Brauner * On idmapped mounts, deletion via subvolid is 3203aabb34e7SChristian Brauner * restricted to subvolumes that are immediate 3204aabb34e7SChristian Brauner * ancestors of the inode referenced by the file 3205aabb34e7SChristian Brauner * descriptor in the ioctl. Otherwise the idmapping 3206aabb34e7SChristian Brauner * could potentially be abused to delete subvolumes 3207aabb34e7SChristian Brauner * anywhere in the filesystem the user wouldn't be able 3208aabb34e7SChristian Brauner * to delete without an idmapped mount. 3209aabb34e7SChristian Brauner */ 3210aabb34e7SChristian Brauner if (old_dir != dir && mnt_userns != &init_user_ns) { 3211aabb34e7SChristian Brauner err = -EOPNOTSUPP; 3212aabb34e7SChristian Brauner goto free_parent; 3213aabb34e7SChristian Brauner } 3214aabb34e7SChristian Brauner 3215949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 3216949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 3217949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 3218949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 3219949964c9SMarcos Paulo de Souza goto free_parent; 3220949964c9SMarcos Paulo de Souza } 32211a9fd417SDavid Sterba /* subvol_name_ptr is already nul terminated */ 3222949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 3223949964c9SMarcos Paulo de Souza } 3224949964c9SMarcos Paulo de Souza } else { 3225949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 3226949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 3227949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 3228949964c9SMarcos Paulo de Souza 3229949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 3230949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 3231949964c9SMarcos Paulo de Souza 3232949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3233949964c9SMarcos Paulo de Souza if (err) 3234949964c9SMarcos Paulo de Souza goto out; 3235949964c9SMarcos Paulo de Souza } 3236949964c9SMarcos Paulo de Souza 3237949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 3238949964c9SMarcos Paulo de Souza 3239949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 3240949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 3241949964c9SMarcos Paulo de Souza err = -EINVAL; 3242949964c9SMarcos Paulo de Souza goto free_subvol_name; 3243949964c9SMarcos Paulo de Souza } 3244949964c9SMarcos Paulo de Souza 3245949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 3246949964c9SMarcos Paulo de Souza err = -ENOTDIR; 3247949964c9SMarcos Paulo de Souza goto free_subvol_name; 3248949964c9SMarcos Paulo de Souza } 3249521e0546SDavid Sterba 325000235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 325100235411SAl Viro if (err == -EINTR) 3252949964c9SMarcos Paulo de Souza goto free_subvol_name; 3253c4ed533bSChristian Brauner dentry = lookup_one(mnt_userns, subvol_name, parent, subvol_namelen); 325476dda93cSYan, Zheng if (IS_ERR(dentry)) { 325576dda93cSYan, Zheng err = PTR_ERR(dentry); 325676dda93cSYan, Zheng goto out_unlock_dir; 325776dda93cSYan, Zheng } 325876dda93cSYan, Zheng 32592b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 326076dda93cSYan, Zheng err = -ENOENT; 326176dda93cSYan, Zheng goto out_dput; 326276dda93cSYan, Zheng } 326376dda93cSYan, Zheng 32642b0143b5SDavid Howells inode = d_inode(dentry); 32654260f7c7SSage Weil dest = BTRFS_I(inode)->root; 32664260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 32674260f7c7SSage Weil /* 32684260f7c7SSage Weil * Regular user. Only allow this with a special mount 32694260f7c7SSage Weil * option, when the user has write+exec access to the 32704260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 32714260f7c7SSage Weil * allowed. 32724260f7c7SSage Weil * 32734260f7c7SSage Weil * Note that this is _not_ check that the subvol is 32744260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 32754260f7c7SSage Weil * otherwise be able to delete. 32764260f7c7SSage Weil * 32774260f7c7SSage Weil * Users who want to delete empty subvols should try 32784260f7c7SSage Weil * rmdir(2). 32794260f7c7SSage Weil */ 32804260f7c7SSage Weil err = -EPERM; 32810b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 32824260f7c7SSage Weil goto out_dput; 32834260f7c7SSage Weil 32844260f7c7SSage Weil /* 32854260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 32864260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 32874260f7c7SSage Weil * must be called on the dentry referencing the root 32884260f7c7SSage Weil * of the subvol, not a random directory contained 32894260f7c7SSage Weil * within it. 32904260f7c7SSage Weil */ 32914260f7c7SSage Weil err = -EINVAL; 32924260f7c7SSage Weil if (root == dest) 32934260f7c7SSage Weil goto out_dput; 32944260f7c7SSage Weil 3295c4ed533bSChristian Brauner err = inode_permission(mnt_userns, inode, MAY_WRITE | MAY_EXEC); 32964260f7c7SSage Weil if (err) 32974260f7c7SSage Weil goto out_dput; 32985c39da5bSMiao Xie } 32994260f7c7SSage Weil 33005c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 3301c4ed533bSChristian Brauner err = btrfs_may_delete(mnt_userns, dir, dentry, 1); 33024260f7c7SSage Weil if (err) 33034260f7c7SSage Weil goto out_dput; 33044260f7c7SSage Weil 33054a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 330676dda93cSYan, Zheng err = -EINVAL; 330776dda93cSYan, Zheng goto out_dput; 330876dda93cSYan, Zheng } 330976dda93cSYan, Zheng 331064708539SJosef Bacik btrfs_inode_lock(inode, 0); 3311f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 331264708539SJosef Bacik btrfs_inode_unlock(inode, 0); 331346008d9dSAmir Goldstein if (!err) { 331446008d9dSAmir Goldstein fsnotify_rmdir(dir, dentry); 331576dda93cSYan, Zheng d_delete(dentry); 331646008d9dSAmir Goldstein } 3317fa6ac876SLiu Bo 331876dda93cSYan, Zheng out_dput: 331976dda93cSYan, Zheng dput(dentry); 332076dda93cSYan, Zheng out_unlock_dir: 332164708539SJosef Bacik btrfs_inode_unlock(dir, 0); 3322949964c9SMarcos Paulo de Souza free_subvol_name: 3323949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3324949964c9SMarcos Paulo de Souza free_parent: 3325949964c9SMarcos Paulo de Souza if (destroy_parent) 3326949964c9SMarcos Paulo de Souza dput(parent); 332700235411SAl Viro out_drop_write: 33282a79f17eSAl Viro mnt_drop_write_file(file); 332976dda93cSYan, Zheng out: 3330949964c9SMarcos Paulo de Souza kfree(vol_args2); 333176dda93cSYan, Zheng kfree(vol_args); 333276dda93cSYan, Zheng return err; 333376dda93cSYan, Zheng } 333476dda93cSYan, Zheng 33351e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3336f46b5a66SChristoph Hellwig { 3337496ad9aaSAl Viro struct inode *inode = file_inode(file); 3338f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3339c853a578SGoldwyn Rodrigues struct btrfs_ioctl_defrag_range_args range = {0}; 3340c146afadSYan Zheng int ret; 3341c146afadSYan Zheng 334225122d15SIlya Dryomov ret = mnt_want_write_file(file); 334325122d15SIlya Dryomov if (ret) 334425122d15SIlya Dryomov return ret; 3345b83cc969SLi Zefan 334625122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 334725122d15SIlya Dryomov ret = -EROFS; 334825122d15SIlya Dryomov goto out; 33495ac00addSStefan Behrens } 3350f46b5a66SChristoph Hellwig 335195ea0486SQu Wenruo /* Subpage defrag will be supported in later commits */ 335295ea0486SQu Wenruo if (root->fs_info->sectorsize < PAGE_SIZE) { 335395ea0486SQu Wenruo ret = -ENOTTY; 335495ea0486SQu Wenruo goto out; 335595ea0486SQu Wenruo } 335695ea0486SQu Wenruo 3357f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3358f46b5a66SChristoph Hellwig case S_IFDIR: 3359e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3360e441d54dSChris Mason ret = -EPERM; 3361e441d54dSChris Mason goto out; 3362e441d54dSChris Mason } 3363de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3364f46b5a66SChristoph Hellwig break; 3365f46b5a66SChristoph Hellwig case S_IFREG: 3366616d374eSAdam Borowski /* 3367616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3368616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3369616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3370616d374eSAdam Borowski */ 3371616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 337247291baaSChristian Brauner inode_permission(&init_user_ns, inode, MAY_WRITE)) { 3373616d374eSAdam Borowski ret = -EPERM; 3374e441d54dSChris Mason goto out; 3375e441d54dSChris Mason } 33761e701a32SChris Mason 33771e701a32SChris Mason if (argp) { 3378c853a578SGoldwyn Rodrigues if (copy_from_user(&range, argp, sizeof(range))) { 33791e701a32SChris Mason ret = -EFAULT; 3380683be16eSDan Carpenter goto out; 33811e701a32SChris Mason } 33821e701a32SChris Mason /* compression requires us to start the IO */ 3383c853a578SGoldwyn Rodrigues if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 3384c853a578SGoldwyn Rodrigues range.flags |= BTRFS_DEFRAG_RANGE_START_IO; 3385c853a578SGoldwyn Rodrigues range.extent_thresh = (u32)-1; 33861e701a32SChris Mason } 33871e701a32SChris Mason } else { 33881e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 3389c853a578SGoldwyn Rodrigues range.len = (u64)-1; 33901e701a32SChris Mason } 33911ccc2e8aSQu Wenruo ret = btrfs_defrag_file(file_inode(file), &file->f_ra, 3392c853a578SGoldwyn Rodrigues &range, BTRFS_OLDEST_GENERATION, 0); 33934cb5300bSChris Mason if (ret > 0) 33944cb5300bSChris Mason ret = 0; 3395f46b5a66SChristoph Hellwig break; 33968929ecfaSYan, Zheng default: 33978929ecfaSYan, Zheng ret = -EINVAL; 3398f46b5a66SChristoph Hellwig } 3399e441d54dSChris Mason out: 340025122d15SIlya Dryomov mnt_drop_write_file(file); 3401e441d54dSChris Mason return ret; 3402f46b5a66SChristoph Hellwig } 3403f46b5a66SChristoph Hellwig 34042ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3405f46b5a66SChristoph Hellwig { 3406f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3407f46b5a66SChristoph Hellwig int ret; 3408f46b5a66SChristoph Hellwig 3409e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3410e441d54dSChris Mason return -EPERM; 3411e441d54dSChris Mason 3412c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) 3413e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3414c9e9f97bSIlya Dryomov 3415dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3416c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3417c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3418c9e9f97bSIlya Dryomov goto out; 3419c9e9f97bSIlya Dryomov } 3420f46b5a66SChristoph Hellwig 34215516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 34222ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3423f46b5a66SChristoph Hellwig 342443d20761SAnand Jain if (!ret) 34250b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 342643d20761SAnand Jain 3427f46b5a66SChristoph Hellwig kfree(vol_args); 3428c9e9f97bSIlya Dryomov out: 3429c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3430f46b5a66SChristoph Hellwig return ret; 3431f46b5a66SChristoph Hellwig } 3432f46b5a66SChristoph Hellwig 34336b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3434f46b5a66SChristoph Hellwig { 34350b246afaSJeff Mahoney struct inode *inode = file_inode(file); 34360b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 34376b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 34383fa421deSJosef Bacik struct block_device *bdev = NULL; 34393fa421deSJosef Bacik fmode_t mode; 3440f46b5a66SChristoph Hellwig int ret; 344167ae34b6SDavid Sterba bool cancel = false; 3442f46b5a66SChristoph Hellwig 3443e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3444e441d54dSChris Mason return -EPERM; 3445e441d54dSChris Mason 3446da24927bSMiao Xie ret = mnt_want_write_file(file); 3447da24927bSMiao Xie if (ret) 3448da24927bSMiao Xie return ret; 3449c146afadSYan Zheng 3450dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3451c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3452c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3453c47ca32dSDan Carpenter goto err_drop; 3454c9e9f97bSIlya Dryomov } 3455f46b5a66SChristoph Hellwig 3456748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3457fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3458fd4e994bSOmar Sandoval goto out; 3459fd4e994bSOmar Sandoval } 34606b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 346167ae34b6SDavid Sterba if (!(vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) && 346267ae34b6SDavid Sterba strcmp("cancel", vol_args->name) == 0) 346367ae34b6SDavid Sterba cancel = true; 346467ae34b6SDavid Sterba 346567ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 346667ae34b6SDavid Sterba cancel); 346767ae34b6SDavid Sterba if (ret) 346867ae34b6SDavid Sterba goto out; 346967ae34b6SDavid Sterba /* Exclusive operation is now claimed */ 347067ae34b6SDavid Sterba 347167ae34b6SDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 34723fa421deSJosef Bacik ret = btrfs_rm_device(fs_info, NULL, vol_args->devid, &bdev, &mode); 347367ae34b6SDavid Sterba else 34743fa421deSJosef Bacik ret = btrfs_rm_device(fs_info, vol_args->name, 0, &bdev, &mode); 347567ae34b6SDavid Sterba 3476c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3477183860f6SAnand Jain 34786b526ed7SAnand Jain if (!ret) { 3479735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 34800b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 34816b526ed7SAnand Jain vol_args->devid); 34826b526ed7SAnand Jain else 34830b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 34846b526ed7SAnand Jain vol_args->name); 34856b526ed7SAnand Jain } 3486183860f6SAnand Jain out: 3487183860f6SAnand Jain kfree(vol_args); 3488c47ca32dSDan Carpenter err_drop: 34894ac20c70SIlya Dryomov mnt_drop_write_file(file); 34903fa421deSJosef Bacik if (bdev) 34913fa421deSJosef Bacik blkdev_put(bdev, mode); 3492f46b5a66SChristoph Hellwig return ret; 3493f46b5a66SChristoph Hellwig } 3494f46b5a66SChristoph Hellwig 3495f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3496f46b5a66SChristoph Hellwig { 34970b246afaSJeff Mahoney struct inode *inode = file_inode(file); 34980b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3499f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 35003fa421deSJosef Bacik struct block_device *bdev = NULL; 35013fa421deSJosef Bacik fmode_t mode; 3502f46b5a66SChristoph Hellwig int ret; 350367ae34b6SDavid Sterba bool cancel; 3504f46b5a66SChristoph Hellwig 3505f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3506f46b5a66SChristoph Hellwig return -EPERM; 3507f46b5a66SChristoph Hellwig 3508f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3509f46b5a66SChristoph Hellwig if (ret) 3510f46b5a66SChristoph Hellwig return ret; 3511f46b5a66SChristoph Hellwig 351258d7bbf8SDavid Sterba vol_args = memdup_user(arg, sizeof(*vol_args)); 351358d7bbf8SDavid Sterba if (IS_ERR(vol_args)) { 351458d7bbf8SDavid Sterba ret = PTR_ERR(vol_args); 351567ae34b6SDavid Sterba goto out_drop_write; 3516f46b5a66SChristoph Hellwig } 351758d7bbf8SDavid Sterba vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 351867ae34b6SDavid Sterba cancel = (strcmp("cancel", vol_args->name) == 0); 3519f46b5a66SChristoph Hellwig 352067ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 352167ae34b6SDavid Sterba cancel); 352267ae34b6SDavid Sterba if (ret == 0) { 35233fa421deSJosef Bacik ret = btrfs_rm_device(fs_info, vol_args->name, 0, &bdev, &mode); 3524f46b5a66SChristoph Hellwig if (!ret) 35250b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3526c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 352767ae34b6SDavid Sterba } 352867ae34b6SDavid Sterba 352967ae34b6SDavid Sterba kfree(vol_args); 353058d7bbf8SDavid Sterba out_drop_write: 3531f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 35323fa421deSJosef Bacik if (bdev) 35333fa421deSJosef Bacik blkdev_put(bdev, mode); 3534f46b5a66SChristoph Hellwig return ret; 3535f46b5a66SChristoph Hellwig } 3536f46b5a66SChristoph Hellwig 35372ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 35382ff7e61eSJeff Mahoney void __user *arg) 3539475f6387SJan Schmidt { 3540027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3541475f6387SJan Schmidt struct btrfs_device *device; 35420b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3543137c5418SJohannes Thumshirn u64 flags_in; 3544027ed2f0SLi Zefan int ret = 0; 3545475f6387SJan Schmidt 3546137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3547137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3548137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3549137c5418SJohannes Thumshirn 3550137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3551137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3552027ed2f0SLi Zefan 3553d03262c7SDavid Sterba rcu_read_lock(); 3554027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3555475f6387SJan Schmidt 3556d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3557027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3558027ed2f0SLi Zefan fi_args->max_id = device->devid; 3559475f6387SJan Schmidt } 3560d03262c7SDavid Sterba rcu_read_unlock(); 3561475f6387SJan Schmidt 3562de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3563bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3564bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3565bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 356680a773fbSDavid Sterba 3567137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3568137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3569137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3570137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3571137c5418SJohannes Thumshirn } 3572137c5418SJohannes Thumshirn 35730fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 35740fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 35750fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 35760fb408a5SJohannes Thumshirn } 35770fb408a5SJohannes Thumshirn 357849bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 357949bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 358049bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 358149bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 358249bac897SJohannes Thumshirn } 358349bac897SJohannes Thumshirn 3584027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3585027ed2f0SLi Zefan ret = -EFAULT; 3586475f6387SJan Schmidt 3587027ed2f0SLi Zefan kfree(fi_args); 3588027ed2f0SLi Zefan return ret; 3589475f6387SJan Schmidt } 3590475f6387SJan Schmidt 35912ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 35922ff7e61eSJeff Mahoney void __user *arg) 3593475f6387SJan Schmidt { 3594475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3595475f6387SJan Schmidt struct btrfs_device *dev; 3596475f6387SJan Schmidt int ret = 0; 3597475f6387SJan Schmidt char *s_uuid = NULL; 3598475f6387SJan Schmidt 3599475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3600475f6387SJan Schmidt if (IS_ERR(di_args)) 3601475f6387SJan Schmidt return PTR_ERR(di_args); 3602475f6387SJan Schmidt 3603dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3604475f6387SJan Schmidt s_uuid = di_args->uuid; 3605475f6387SJan Schmidt 3606c5593ca3SDavid Sterba rcu_read_lock(); 3607e4319cd9SAnand Jain dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid, 3608b2598edfSAnand Jain NULL); 3609475f6387SJan Schmidt 3610475f6387SJan Schmidt if (!dev) { 3611475f6387SJan Schmidt ret = -ENODEV; 3612475f6387SJan Schmidt goto out; 3613475f6387SJan Schmidt } 3614475f6387SJan Schmidt 3615475f6387SJan Schmidt di_args->devid = dev->devid; 36167cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 36177cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3618475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3619a27202fbSJim Meyering if (dev->name) { 3620672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3621672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3622a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3623a27202fbSJim Meyering } else { 362499ba55adSStefan Behrens di_args->path[0] = '\0'; 3625a27202fbSJim Meyering } 3626475f6387SJan Schmidt 3627475f6387SJan Schmidt out: 3628c5593ca3SDavid Sterba rcu_read_unlock(); 3629475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3630475f6387SJan Schmidt ret = -EFAULT; 3631475f6387SJan Schmidt 3632475f6387SJan Schmidt kfree(di_args); 3633475f6387SJan Schmidt return ret; 3634475f6387SJan Schmidt } 3635475f6387SJan Schmidt 36366ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 36376ef5ed0dSJosef Bacik { 3638496ad9aaSAl Viro struct inode *inode = file_inode(file); 36390b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 36406ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 36416ef5ed0dSJosef Bacik struct btrfs_root *new_root; 36426ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 36436ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 36442a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 36456ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 36466ef5ed0dSJosef Bacik u64 objectid = 0; 36476ef5ed0dSJosef Bacik u64 dir_id; 36483c04ce01SMiao Xie int ret; 36496ef5ed0dSJosef Bacik 36506ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 36516ef5ed0dSJosef Bacik return -EPERM; 36526ef5ed0dSJosef Bacik 36533c04ce01SMiao Xie ret = mnt_want_write_file(file); 36543c04ce01SMiao Xie if (ret) 36553c04ce01SMiao Xie return ret; 36563c04ce01SMiao Xie 36573c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 36583c04ce01SMiao Xie ret = -EFAULT; 36593c04ce01SMiao Xie goto out; 36603c04ce01SMiao Xie } 36616ef5ed0dSJosef Bacik 36626ef5ed0dSJosef Bacik if (!objectid) 36631cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 36646ef5ed0dSJosef Bacik 366556e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 36663c04ce01SMiao Xie if (IS_ERR(new_root)) { 36673c04ce01SMiao Xie ret = PTR_ERR(new_root); 36683c04ce01SMiao Xie goto out; 36693c04ce01SMiao Xie } 36702a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 36712a2b5d62SJosef Bacik ret = -ENOENT; 36722a2b5d62SJosef Bacik goto out_free; 36732a2b5d62SJosef Bacik } 36746ef5ed0dSJosef Bacik 36756ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 36763c04ce01SMiao Xie if (!path) { 36773c04ce01SMiao Xie ret = -ENOMEM; 36782a2b5d62SJosef Bacik goto out_free; 36793c04ce01SMiao Xie } 36806ef5ed0dSJosef Bacik 36816ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 368298d5dc13STsutomu Itoh if (IS_ERR(trans)) { 36833c04ce01SMiao Xie ret = PTR_ERR(trans); 36842a2b5d62SJosef Bacik goto out_free; 36856ef5ed0dSJosef Bacik } 36866ef5ed0dSJosef Bacik 36870b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 36880b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 36896ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3690cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 36912a2b5d62SJosef Bacik btrfs_release_path(path); 36923a45bb20SJeff Mahoney btrfs_end_transaction(trans); 36930b246afaSJeff Mahoney btrfs_err(fs_info, 36945d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 36953c04ce01SMiao Xie ret = -ENOENT; 36962a2b5d62SJosef Bacik goto out_free; 36976ef5ed0dSJosef Bacik } 36986ef5ed0dSJosef Bacik 36996ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 37006ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 37016ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 37022a2b5d62SJosef Bacik btrfs_release_path(path); 37036ef5ed0dSJosef Bacik 37040b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 37053a45bb20SJeff Mahoney btrfs_end_transaction(trans); 37062a2b5d62SJosef Bacik out_free: 370700246528SJosef Bacik btrfs_put_root(new_root); 37082a2b5d62SJosef Bacik btrfs_free_path(path); 37093c04ce01SMiao Xie out: 37103c04ce01SMiao Xie mnt_drop_write_file(file); 37113c04ce01SMiao Xie return ret; 37126ef5ed0dSJosef Bacik } 37136ef5ed0dSJosef Bacik 3714c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3715bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3716bf5fc093SJosef Bacik { 371732da5386SDavid Sterba struct btrfs_block_group *block_group; 3718bf5fc093SJosef Bacik 3719bf5fc093SJosef Bacik space->total_bytes = 0; 3720bf5fc093SJosef Bacik space->used_bytes = 0; 3721bf5fc093SJosef Bacik space->flags = 0; 3722bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3723bf5fc093SJosef Bacik space->flags = block_group->flags; 3724b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3725bf38be65SDavid Sterba space->used_bytes += block_group->used; 3726bf5fc093SJosef Bacik } 3727bf5fc093SJosef Bacik } 3728bf5fc093SJosef Bacik 37292ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 37302ff7e61eSJeff Mahoney void __user *arg) 37311406e432SJosef Bacik { 37321406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 37331406e432SJosef Bacik struct btrfs_ioctl_space_info space; 37341406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 37357fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 373613f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 37371406e432SJosef Bacik struct btrfs_space_info *info; 3738315d8e98SColin Ian King static const u64 types[] = { 3739315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3740bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3741bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3742315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3743315d8e98SColin Ian King }; 3744bf5fc093SJosef Bacik int num_types = 4; 37457fde62bfSChris Mason int alloc_size; 37461406e432SJosef Bacik int ret = 0; 374751788b1bSDan Rosenberg u64 slot_count = 0; 3748bf5fc093SJosef Bacik int i, c; 37491406e432SJosef Bacik 37501406e432SJosef Bacik if (copy_from_user(&space_args, 37511406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 37521406e432SJosef Bacik sizeof(space_args))) 37531406e432SJosef Bacik return -EFAULT; 37541406e432SJosef Bacik 3755bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3756bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3757bf5fc093SJosef Bacik 3758bf5fc093SJosef Bacik info = NULL; 375972804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3760bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3761bf5fc093SJosef Bacik info = tmp; 3762bf5fc093SJosef Bacik break; 3763bf5fc093SJosef Bacik } 3764bf5fc093SJosef Bacik } 37651406e432SJosef Bacik 3766bf5fc093SJosef Bacik if (!info) 3767bf5fc093SJosef Bacik continue; 3768bf5fc093SJosef Bacik 3769bf5fc093SJosef Bacik down_read(&info->groups_sem); 3770bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3771bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3772bf5fc093SJosef Bacik slot_count++; 3773bf5fc093SJosef Bacik } 3774bf5fc093SJosef Bacik up_read(&info->groups_sem); 3775bf5fc093SJosef Bacik } 3776bf5fc093SJosef Bacik 377736523e95SDavid Sterba /* 377836523e95SDavid Sterba * Global block reserve, exported as a space_info 377936523e95SDavid Sterba */ 378036523e95SDavid Sterba slot_count++; 378136523e95SDavid Sterba 37827fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 37837fde62bfSChris Mason if (space_args.space_slots == 0) { 37847fde62bfSChris Mason space_args.total_spaces = slot_count; 37857fde62bfSChris Mason goto out; 37867fde62bfSChris Mason } 3787bf5fc093SJosef Bacik 378851788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3789bf5fc093SJosef Bacik 37907fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3791bf5fc093SJosef Bacik 37927fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 37937fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 37947fde62bfSChris Mason */ 379509cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 37967fde62bfSChris Mason return -ENOMEM; 37977fde62bfSChris Mason 37987fde62bfSChris Mason space_args.total_spaces = 0; 37998d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 38007fde62bfSChris Mason if (!dest) 38017fde62bfSChris Mason return -ENOMEM; 38027fde62bfSChris Mason dest_orig = dest; 38037fde62bfSChris Mason 38047fde62bfSChris Mason /* now we have a buffer to copy into */ 3805bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3806bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3807bf5fc093SJosef Bacik 380851788b1bSDan Rosenberg if (!slot_count) 380951788b1bSDan Rosenberg break; 381051788b1bSDan Rosenberg 3811bf5fc093SJosef Bacik info = NULL; 381272804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3813bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3814bf5fc093SJosef Bacik info = tmp; 38157fde62bfSChris Mason break; 3816bf5fc093SJosef Bacik } 3817bf5fc093SJosef Bacik } 38187fde62bfSChris Mason 3819bf5fc093SJosef Bacik if (!info) 3820bf5fc093SJosef Bacik continue; 3821bf5fc093SJosef Bacik down_read(&info->groups_sem); 3822bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3823bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3824c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3825c065f5b1SSu Yue &space); 38267fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 38271406e432SJosef Bacik dest++; 38281406e432SJosef Bacik space_args.total_spaces++; 382951788b1bSDan Rosenberg slot_count--; 38301406e432SJosef Bacik } 383151788b1bSDan Rosenberg if (!slot_count) 383251788b1bSDan Rosenberg break; 3833bf5fc093SJosef Bacik } 3834bf5fc093SJosef Bacik up_read(&info->groups_sem); 3835bf5fc093SJosef Bacik } 38361406e432SJosef Bacik 383736523e95SDavid Sterba /* 383836523e95SDavid Sterba * Add global block reserve 383936523e95SDavid Sterba */ 384036523e95SDavid Sterba if (slot_count) { 38410b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 384236523e95SDavid Sterba 384336523e95SDavid Sterba spin_lock(&block_rsv->lock); 384436523e95SDavid Sterba space.total_bytes = block_rsv->size; 384536523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 384636523e95SDavid Sterba spin_unlock(&block_rsv->lock); 384736523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 384836523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 384936523e95SDavid Sterba space_args.total_spaces++; 385036523e95SDavid Sterba } 385136523e95SDavid Sterba 38522eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 38537fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 38547fde62bfSChris Mason 38557fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 38567fde62bfSChris Mason ret = -EFAULT; 38577fde62bfSChris Mason 38587fde62bfSChris Mason kfree(dest_orig); 38597fde62bfSChris Mason out: 38607fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 38611406e432SJosef Bacik ret = -EFAULT; 38621406e432SJosef Bacik 38631406e432SJosef Bacik return ret; 38641406e432SJosef Bacik } 38651406e432SJosef Bacik 38669a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 38679a8c28beSMiao Xie void __user *argp) 386846204592SSage Weil { 386946204592SSage Weil struct btrfs_trans_handle *trans; 387046204592SSage Weil u64 transid; 3871db5b493aSTsutomu Itoh int ret; 387246204592SSage Weil 3873d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3874ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3875ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 387698d5dc13STsutomu Itoh return PTR_ERR(trans); 3877ff7c1d33SMiao Xie 3878ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3879ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3880ff7c1d33SMiao Xie goto out; 3881ff7c1d33SMiao Xie } 388246204592SSage Weil transid = trans->transid; 388332cc4f87SDavid Sterba ret = btrfs_commit_transaction_async(trans); 38848b2b2d3cSTsutomu Itoh if (ret) { 38853a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3886db5b493aSTsutomu Itoh return ret; 38878b2b2d3cSTsutomu Itoh } 3888ff7c1d33SMiao Xie out: 388946204592SSage Weil if (argp) 389046204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 389146204592SSage Weil return -EFAULT; 389246204592SSage Weil return 0; 389346204592SSage Weil } 389446204592SSage Weil 38952ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 38969a8c28beSMiao Xie void __user *argp) 389746204592SSage Weil { 389846204592SSage Weil u64 transid; 389946204592SSage Weil 390046204592SSage Weil if (argp) { 390146204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 390246204592SSage Weil return -EFAULT; 390346204592SSage Weil } else { 390446204592SSage Weil transid = 0; /* current trans */ 390546204592SSage Weil } 39062ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 390746204592SSage Weil } 390846204592SSage Weil 3909b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3910475f6387SJan Schmidt { 39110b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3912475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3913b8e95489SMiao Xie int ret; 3914475f6387SJan Schmidt 3915475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3916475f6387SJan Schmidt return -EPERM; 3917475f6387SJan Schmidt 3918475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3919475f6387SJan Schmidt if (IS_ERR(sa)) 3920475f6387SJan Schmidt return PTR_ERR(sa); 3921475f6387SJan Schmidt 3922b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3923b8e95489SMiao Xie ret = mnt_want_write_file(file); 3924b8e95489SMiao Xie if (ret) 3925b8e95489SMiao Xie goto out; 3926b8e95489SMiao Xie } 3927b8e95489SMiao Xie 39280b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 392963a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 393063a212abSStefan Behrens 0); 3931475f6387SJan Schmidt 39325afe6ce7SFilipe Manana /* 39335afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 39345afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 39355afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 39365afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 39375afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 39385afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 39395afe6ce7SFilipe Manana * previously (btrfs-progs does this). 39405afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 39415afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 39425afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 39435afe6ce7SFilipe Manana */ 39445afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3945475f6387SJan Schmidt ret = -EFAULT; 3946475f6387SJan Schmidt 3947b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3948b8e95489SMiao Xie mnt_drop_write_file(file); 3949b8e95489SMiao Xie out: 3950475f6387SJan Schmidt kfree(sa); 3951475f6387SJan Schmidt return ret; 3952475f6387SJan Schmidt } 3953475f6387SJan Schmidt 39542ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3955475f6387SJan Schmidt { 3956475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3957475f6387SJan Schmidt return -EPERM; 3958475f6387SJan Schmidt 39592ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3960475f6387SJan Schmidt } 3961475f6387SJan Schmidt 39622ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3963475f6387SJan Schmidt void __user *arg) 3964475f6387SJan Schmidt { 3965475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3966475f6387SJan Schmidt int ret; 3967475f6387SJan Schmidt 3968475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3969475f6387SJan Schmidt return -EPERM; 3970475f6387SJan Schmidt 3971475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3972475f6387SJan Schmidt if (IS_ERR(sa)) 3973475f6387SJan Schmidt return PTR_ERR(sa); 3974475f6387SJan Schmidt 39752ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3976475f6387SJan Schmidt 39774fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3978475f6387SJan Schmidt ret = -EFAULT; 3979475f6387SJan Schmidt 3980475f6387SJan Schmidt kfree(sa); 3981475f6387SJan Schmidt return ret; 3982475f6387SJan Schmidt } 3983475f6387SJan Schmidt 39842ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3985b27f7c0cSDavid Sterba void __user *arg) 3986c11d2c23SStefan Behrens { 3987c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3988c11d2c23SStefan Behrens int ret; 3989c11d2c23SStefan Behrens 3990c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3991c11d2c23SStefan Behrens if (IS_ERR(sa)) 3992c11d2c23SStefan Behrens return PTR_ERR(sa); 3993c11d2c23SStefan Behrens 3994b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3995b27f7c0cSDavid Sterba kfree(sa); 3996b27f7c0cSDavid Sterba return -EPERM; 3997b27f7c0cSDavid Sterba } 3998b27f7c0cSDavid Sterba 39992ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 4000c11d2c23SStefan Behrens 4001eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 4002c11d2c23SStefan Behrens ret = -EFAULT; 4003c11d2c23SStefan Behrens 4004c11d2c23SStefan Behrens kfree(sa); 4005c11d2c23SStefan Behrens return ret; 4006c11d2c23SStefan Behrens } 4007c11d2c23SStefan Behrens 40082ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 40092ff7e61eSJeff Mahoney void __user *arg) 40103f6bcfbdSStefan Behrens { 40113f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 40123f6bcfbdSStefan Behrens int ret; 40133f6bcfbdSStefan Behrens 40143f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 40153f6bcfbdSStefan Behrens return -EPERM; 40163f6bcfbdSStefan Behrens 40173f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 40183f6bcfbdSStefan Behrens if (IS_ERR(p)) 40193f6bcfbdSStefan Behrens return PTR_ERR(p); 40203f6bcfbdSStefan Behrens 40213f6bcfbdSStefan Behrens switch (p->cmd) { 40223f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 4023bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 4024adfa97cbSIlya Dryomov ret = -EROFS; 4025adfa97cbSIlya Dryomov goto out; 4026adfa97cbSIlya Dryomov } 4027c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 4028e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 40293f6bcfbdSStefan Behrens } else { 40302ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 4031c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 40323f6bcfbdSStefan Behrens } 40333f6bcfbdSStefan Behrens break; 40343f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 40350b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 40363f6bcfbdSStefan Behrens ret = 0; 40373f6bcfbdSStefan Behrens break; 40383f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 403917d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 404097282031SAnand Jain ret = 0; 40413f6bcfbdSStefan Behrens break; 40423f6bcfbdSStefan Behrens default: 40433f6bcfbdSStefan Behrens ret = -EINVAL; 40443f6bcfbdSStefan Behrens break; 40453f6bcfbdSStefan Behrens } 40463f6bcfbdSStefan Behrens 4047d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 40483f6bcfbdSStefan Behrens ret = -EFAULT; 4049adfa97cbSIlya Dryomov out: 40503f6bcfbdSStefan Behrens kfree(p); 40513f6bcfbdSStefan Behrens return ret; 40523f6bcfbdSStefan Behrens } 40533f6bcfbdSStefan Behrens 4054d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 4055d7728c96SJan Schmidt { 4056d7728c96SJan Schmidt int ret = 0; 4057d7728c96SJan Schmidt int i; 4058740c3d22SChris Mason u64 rel_ptr; 4059d7728c96SJan Schmidt int size; 4060806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 4061d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 4062d7728c96SJan Schmidt struct btrfs_path *path; 4063d7728c96SJan Schmidt 406482b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 4065d7728c96SJan Schmidt return -EPERM; 4066d7728c96SJan Schmidt 4067d7728c96SJan Schmidt path = btrfs_alloc_path(); 4068d7728c96SJan Schmidt if (!path) { 4069d7728c96SJan Schmidt ret = -ENOMEM; 4070d7728c96SJan Schmidt goto out; 4071d7728c96SJan Schmidt } 4072d7728c96SJan Schmidt 4073d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 4074d7728c96SJan Schmidt if (IS_ERR(ipa)) { 4075d7728c96SJan Schmidt ret = PTR_ERR(ipa); 4076d7728c96SJan Schmidt ipa = NULL; 4077d7728c96SJan Schmidt goto out; 4078d7728c96SJan Schmidt } 4079d7728c96SJan Schmidt 4080d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 4081d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 4082d7728c96SJan Schmidt if (IS_ERR(ipath)) { 4083d7728c96SJan Schmidt ret = PTR_ERR(ipath); 4084d7728c96SJan Schmidt ipath = NULL; 4085d7728c96SJan Schmidt goto out; 4086d7728c96SJan Schmidt } 4087d7728c96SJan Schmidt 4088d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 4089d7728c96SJan Schmidt if (ret < 0) 4090d7728c96SJan Schmidt goto out; 4091d7728c96SJan Schmidt 4092d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 4093745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 4094745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 4095740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 4096d7728c96SJan Schmidt } 4097d7728c96SJan Schmidt 4098718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 4099718dc5faSOmar Sandoval ipath->fspath, size); 4100d7728c96SJan Schmidt if (ret) { 4101d7728c96SJan Schmidt ret = -EFAULT; 4102d7728c96SJan Schmidt goto out; 4103d7728c96SJan Schmidt } 4104d7728c96SJan Schmidt 4105d7728c96SJan Schmidt out: 4106d7728c96SJan Schmidt btrfs_free_path(path); 4107d7728c96SJan Schmidt free_ipath(ipath); 4108d7728c96SJan Schmidt kfree(ipa); 4109d7728c96SJan Schmidt 4110d7728c96SJan Schmidt return ret; 4111d7728c96SJan Schmidt } 4112d7728c96SJan Schmidt 4113d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 4114d7728c96SJan Schmidt { 4115d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 4116d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 4117d7728c96SJan Schmidt 4118d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 4119d7728c96SJan Schmidt inodes->bytes_left -= c; 4120d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 4121d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 4122d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 4123d7728c96SJan Schmidt inodes->elem_cnt += 3; 4124d7728c96SJan Schmidt } else { 4125d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 4126d7728c96SJan Schmidt inodes->bytes_left = 0; 4127d7728c96SJan Schmidt inodes->elem_missed += 3; 4128d7728c96SJan Schmidt } 4129d7728c96SJan Schmidt 4130d7728c96SJan Schmidt return 0; 4131d7728c96SJan Schmidt } 4132d7728c96SJan Schmidt 41332ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 4134d24a67b2SZygo Blaxell void __user *arg, int version) 4135d7728c96SJan Schmidt { 4136d7728c96SJan Schmidt int ret = 0; 4137d7728c96SJan Schmidt int size; 4138d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 4139d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 4140d7728c96SJan Schmidt struct btrfs_path *path = NULL; 4141d24a67b2SZygo Blaxell bool ignore_offset; 4142d7728c96SJan Schmidt 4143d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4144d7728c96SJan Schmidt return -EPERM; 4145d7728c96SJan Schmidt 4146d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 41477b9ea627SShailendra Verma if (IS_ERR(loi)) 41487b9ea627SShailendra Verma return PTR_ERR(loi); 4149d7728c96SJan Schmidt 4150d24a67b2SZygo Blaxell if (version == 1) { 4151d24a67b2SZygo Blaxell ignore_offset = false; 4152b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 4153d24a67b2SZygo Blaxell } else { 4154d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 4155d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 4156d24a67b2SZygo Blaxell ret = -EINVAL; 4157d24a67b2SZygo Blaxell goto out_loi; 4158d24a67b2SZygo Blaxell } 4159d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 4160d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 4161d24a67b2SZygo Blaxell ret = -EINVAL; 4162d24a67b2SZygo Blaxell goto out_loi; 4163d24a67b2SZygo Blaxell } 4164d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 4165b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 4166d24a67b2SZygo Blaxell } 4167d24a67b2SZygo Blaxell 4168d7728c96SJan Schmidt path = btrfs_alloc_path(); 4169d7728c96SJan Schmidt if (!path) { 4170d7728c96SJan Schmidt ret = -ENOMEM; 4171d7728c96SJan Schmidt goto out; 4172d7728c96SJan Schmidt } 4173d7728c96SJan Schmidt 4174d7728c96SJan Schmidt inodes = init_data_container(size); 4175d7728c96SJan Schmidt if (IS_ERR(inodes)) { 4176d7728c96SJan Schmidt ret = PTR_ERR(inodes); 4177d7728c96SJan Schmidt inodes = NULL; 4178d7728c96SJan Schmidt goto out; 4179d7728c96SJan Schmidt } 4180d7728c96SJan Schmidt 41812ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 4182d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 4183df031f07SLiu Bo if (ret == -EINVAL) 4184d7728c96SJan Schmidt ret = -ENOENT; 4185d7728c96SJan Schmidt if (ret < 0) 4186d7728c96SJan Schmidt goto out; 4187d7728c96SJan Schmidt 4188718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 4189718dc5faSOmar Sandoval size); 4190d7728c96SJan Schmidt if (ret) 4191d7728c96SJan Schmidt ret = -EFAULT; 4192d7728c96SJan Schmidt 4193d7728c96SJan Schmidt out: 4194d7728c96SJan Schmidt btrfs_free_path(path); 4195f54de068SDavid Sterba kvfree(inodes); 4196d24a67b2SZygo Blaxell out_loi: 4197d7728c96SJan Schmidt kfree(loi); 4198d7728c96SJan Schmidt 4199d7728c96SJan Schmidt return ret; 4200d7728c96SJan Schmidt } 4201d7728c96SJan Schmidt 4202008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 4203c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 4204c9e9f97bSIlya Dryomov { 4205c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 4206c9e9f97bSIlya Dryomov 4207c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 4208c9e9f97bSIlya Dryomov 42093009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 4210837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 4211837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 4212837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 4213a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 4214a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 4215837d5b6eSIlya Dryomov 4216c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 4217c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 4218c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 421919a39dceSIlya Dryomov 422019a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 422119a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 422219a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 4223c9e9f97bSIlya Dryomov } 4224c9e9f97bSIlya Dryomov 42259ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4226c9e9f97bSIlya Dryomov { 4227496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4228c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4229c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4230c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4231ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4232c9e9f97bSIlya Dryomov int ret; 4233c9e9f97bSIlya Dryomov 4234c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4235c9e9f97bSIlya Dryomov return -EPERM; 4236c9e9f97bSIlya Dryomov 4237e54bfa31SLiu Bo ret = mnt_want_write_file(file); 42389ba1f6e4SLiu Bo if (ret) 42399ba1f6e4SLiu Bo return ret; 42409ba1f6e4SLiu Bo 4241ed0fb78fSIlya Dryomov again: 4242c3e1f96cSGoldwyn Rodrigues if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 4243c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4244ed0fb78fSIlya Dryomov need_unlock = true; 4245ed0fb78fSIlya Dryomov goto locked; 4246ed0fb78fSIlya Dryomov } 4247ed0fb78fSIlya Dryomov 4248ed0fb78fSIlya Dryomov /* 424901327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 4250ed0fb78fSIlya Dryomov * (1) some other op is running 4251ed0fb78fSIlya Dryomov * (2) balance is running 4252ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4253ed0fb78fSIlya Dryomov */ 4254ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4255ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4256ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 42573009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4258ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4259dccdb07bSDavid Sterba /* 4260dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 4261dccdb07bSDavid Sterba * we'll reexamine the status again. 4262dccdb07bSDavid Sterba */ 4263ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4264ed0fb78fSIlya Dryomov 4265ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 42663009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4267ed0fb78fSIlya Dryomov /* this is (3) */ 4268ed0fb78fSIlya Dryomov need_unlock = false; 4269ed0fb78fSIlya Dryomov goto locked; 4270ed0fb78fSIlya Dryomov } 4271ed0fb78fSIlya Dryomov 4272ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4273ed0fb78fSIlya Dryomov goto again; 4274ed0fb78fSIlya Dryomov } else { 4275ed0fb78fSIlya Dryomov /* this is (2) */ 4276ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4277ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4278ed0fb78fSIlya Dryomov goto out; 4279ed0fb78fSIlya Dryomov } 4280ed0fb78fSIlya Dryomov } else { 4281ed0fb78fSIlya Dryomov /* this is (1) */ 4282ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4283e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4284ed0fb78fSIlya Dryomov goto out; 4285ed0fb78fSIlya Dryomov } 4286ed0fb78fSIlya Dryomov 4287ed0fb78fSIlya Dryomov locked: 4288c9e9f97bSIlya Dryomov 4289c9e9f97bSIlya Dryomov if (arg) { 4290c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4291c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4292c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4293ed0fb78fSIlya Dryomov goto out_unlock; 4294c9e9f97bSIlya Dryomov } 4295de322263SIlya Dryomov 4296de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4297de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4298de322263SIlya Dryomov ret = -ENOTCONN; 4299de322263SIlya Dryomov goto out_bargs; 4300de322263SIlya Dryomov } 4301de322263SIlya Dryomov 4302de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4303de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4304de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4305de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4306de322263SIlya Dryomov 4307de322263SIlya Dryomov goto do_balance; 4308de322263SIlya Dryomov } 4309c9e9f97bSIlya Dryomov } else { 4310c9e9f97bSIlya Dryomov bargs = NULL; 4311c9e9f97bSIlya Dryomov } 4312c9e9f97bSIlya Dryomov 4313ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4314837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4315837d5b6eSIlya Dryomov goto out_bargs; 4316837d5b6eSIlya Dryomov } 4317837d5b6eSIlya Dryomov 43188d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4319c9e9f97bSIlya Dryomov if (!bctl) { 4320c9e9f97bSIlya Dryomov ret = -ENOMEM; 4321c9e9f97bSIlya Dryomov goto out_bargs; 4322c9e9f97bSIlya Dryomov } 4323c9e9f97bSIlya Dryomov 4324c9e9f97bSIlya Dryomov if (arg) { 4325c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4326c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4327c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4328c9e9f97bSIlya Dryomov 4329c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4330f43ffb60SIlya Dryomov } else { 4331f43ffb60SIlya Dryomov /* balance everything - no filters */ 4332f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4333c9e9f97bSIlya Dryomov } 4334c9e9f97bSIlya Dryomov 43358eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 43368eb93459SDavid Sterba ret = -EINVAL; 43370f89abf5SChristian Engelmayer goto out_bctl; 43388eb93459SDavid Sterba } 43398eb93459SDavid Sterba 4340de322263SIlya Dryomov do_balance: 4341c9e9f97bSIlya Dryomov /* 4342c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 4343c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 4344c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 4345c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 4346c9e9f97bSIlya Dryomov */ 4347ed0fb78fSIlya Dryomov need_unlock = false; 4348ed0fb78fSIlya Dryomov 43496fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 43500f89abf5SChristian Engelmayer bctl = NULL; 4351ed0fb78fSIlya Dryomov 4352d00c2d9cSFilipe Manana if ((ret == 0 || ret == -ECANCELED) && arg) { 4353c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4354c9e9f97bSIlya Dryomov ret = -EFAULT; 4355c9e9f97bSIlya Dryomov } 4356c9e9f97bSIlya Dryomov 43570f89abf5SChristian Engelmayer out_bctl: 43580f89abf5SChristian Engelmayer kfree(bctl); 4359c9e9f97bSIlya Dryomov out_bargs: 4360c9e9f97bSIlya Dryomov kfree(bargs); 4361ed0fb78fSIlya Dryomov out_unlock: 4362c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4363ed0fb78fSIlya Dryomov if (need_unlock) 4364c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 4365ed0fb78fSIlya Dryomov out: 4366e54bfa31SLiu Bo mnt_drop_write_file(file); 4367c9e9f97bSIlya Dryomov return ret; 4368c9e9f97bSIlya Dryomov } 4369c9e9f97bSIlya Dryomov 43702ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4371837d5b6eSIlya Dryomov { 4372837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4373837d5b6eSIlya Dryomov return -EPERM; 4374837d5b6eSIlya Dryomov 4375837d5b6eSIlya Dryomov switch (cmd) { 4376837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 43770b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4378a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 43790b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4380837d5b6eSIlya Dryomov } 4381837d5b6eSIlya Dryomov 4382837d5b6eSIlya Dryomov return -EINVAL; 4383837d5b6eSIlya Dryomov } 4384837d5b6eSIlya Dryomov 43852ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 438619a39dceSIlya Dryomov void __user *arg) 438719a39dceSIlya Dryomov { 438819a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 438919a39dceSIlya Dryomov int ret = 0; 439019a39dceSIlya Dryomov 439119a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 439219a39dceSIlya Dryomov return -EPERM; 439319a39dceSIlya Dryomov 439419a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 439519a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 439619a39dceSIlya Dryomov ret = -ENOTCONN; 439719a39dceSIlya Dryomov goto out; 439819a39dceSIlya Dryomov } 439919a39dceSIlya Dryomov 44008d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 440119a39dceSIlya Dryomov if (!bargs) { 440219a39dceSIlya Dryomov ret = -ENOMEM; 440319a39dceSIlya Dryomov goto out; 440419a39dceSIlya Dryomov } 440519a39dceSIlya Dryomov 4406008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 440719a39dceSIlya Dryomov 440819a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 440919a39dceSIlya Dryomov ret = -EFAULT; 441019a39dceSIlya Dryomov 441119a39dceSIlya Dryomov kfree(bargs); 441219a39dceSIlya Dryomov out: 441319a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 441419a39dceSIlya Dryomov return ret; 441519a39dceSIlya Dryomov } 441619a39dceSIlya Dryomov 4417905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 44185d13a37bSArne Jansen { 44190b246afaSJeff Mahoney struct inode *inode = file_inode(file); 44200b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 44215d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 44225d13a37bSArne Jansen int ret; 44235d13a37bSArne Jansen 44245d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 44255d13a37bSArne Jansen return -EPERM; 44265d13a37bSArne Jansen 4427905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4428905b0ddaSMiao Xie if (ret) 4429905b0ddaSMiao Xie return ret; 44305d13a37bSArne Jansen 44315d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4432905b0ddaSMiao Xie if (IS_ERR(sa)) { 4433905b0ddaSMiao Xie ret = PTR_ERR(sa); 4434905b0ddaSMiao Xie goto drop_write; 4435905b0ddaSMiao Xie } 44365d13a37bSArne Jansen 44370b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 44385d13a37bSArne Jansen 44395d13a37bSArne Jansen switch (sa->cmd) { 44405d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4441340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 44425d13a37bSArne Jansen break; 44435d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4444340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 44455d13a37bSArne Jansen break; 44465d13a37bSArne Jansen default: 44475d13a37bSArne Jansen ret = -EINVAL; 44485d13a37bSArne Jansen break; 44495d13a37bSArne Jansen } 44505d13a37bSArne Jansen 44515d13a37bSArne Jansen kfree(sa); 44520b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4453905b0ddaSMiao Xie drop_write: 4454905b0ddaSMiao Xie mnt_drop_write_file(file); 44555d13a37bSArne Jansen return ret; 44565d13a37bSArne Jansen } 44575d13a37bSArne Jansen 4458905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 44595d13a37bSArne Jansen { 44600b246afaSJeff Mahoney struct inode *inode = file_inode(file); 44610b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 44620b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 44635d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 44645d13a37bSArne Jansen struct btrfs_trans_handle *trans; 44655d13a37bSArne Jansen int ret; 44665d13a37bSArne Jansen int err; 44675d13a37bSArne Jansen 44685d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 44695d13a37bSArne Jansen return -EPERM; 44705d13a37bSArne Jansen 4471905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4472905b0ddaSMiao Xie if (ret) 4473905b0ddaSMiao Xie return ret; 44745d13a37bSArne Jansen 44755d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4476905b0ddaSMiao Xie if (IS_ERR(sa)) { 4477905b0ddaSMiao Xie ret = PTR_ERR(sa); 4478905b0ddaSMiao Xie goto drop_write; 4479905b0ddaSMiao Xie } 44805d13a37bSArne Jansen 44815d13a37bSArne Jansen trans = btrfs_join_transaction(root); 44825d13a37bSArne Jansen if (IS_ERR(trans)) { 44835d13a37bSArne Jansen ret = PTR_ERR(trans); 44845d13a37bSArne Jansen goto out; 44855d13a37bSArne Jansen } 44865d13a37bSArne Jansen 44875d13a37bSArne Jansen if (sa->assign) { 44889f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 44895d13a37bSArne Jansen } else { 449039616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 44915d13a37bSArne Jansen } 44925d13a37bSArne Jansen 4493e082f563SQu Wenruo /* update qgroup status and info */ 4494280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4495e082f563SQu Wenruo if (err < 0) 44960b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4497ad8403dfSAnand Jain "failed to update qgroup status and info"); 44983a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 44995d13a37bSArne Jansen if (err && !ret) 45005d13a37bSArne Jansen ret = err; 45015d13a37bSArne Jansen 45025d13a37bSArne Jansen out: 45035d13a37bSArne Jansen kfree(sa); 4504905b0ddaSMiao Xie drop_write: 4505905b0ddaSMiao Xie mnt_drop_write_file(file); 45065d13a37bSArne Jansen return ret; 45075d13a37bSArne Jansen } 45085d13a37bSArne Jansen 4509905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 45105d13a37bSArne Jansen { 45110b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45120b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 45135d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 45145d13a37bSArne Jansen struct btrfs_trans_handle *trans; 45155d13a37bSArne Jansen int ret; 45165d13a37bSArne Jansen int err; 45175d13a37bSArne Jansen 45185d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 45195d13a37bSArne Jansen return -EPERM; 45205d13a37bSArne Jansen 4521905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4522905b0ddaSMiao Xie if (ret) 4523905b0ddaSMiao Xie return ret; 45245d13a37bSArne Jansen 45255d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4526905b0ddaSMiao Xie if (IS_ERR(sa)) { 4527905b0ddaSMiao Xie ret = PTR_ERR(sa); 4528905b0ddaSMiao Xie goto drop_write; 4529905b0ddaSMiao Xie } 45305d13a37bSArne Jansen 4531d86e56cfSMiao Xie if (!sa->qgroupid) { 4532d86e56cfSMiao Xie ret = -EINVAL; 4533d86e56cfSMiao Xie goto out; 4534d86e56cfSMiao Xie } 4535d86e56cfSMiao Xie 45365d13a37bSArne Jansen trans = btrfs_join_transaction(root); 45375d13a37bSArne Jansen if (IS_ERR(trans)) { 45385d13a37bSArne Jansen ret = PTR_ERR(trans); 45395d13a37bSArne Jansen goto out; 45405d13a37bSArne Jansen } 45415d13a37bSArne Jansen 45425d13a37bSArne Jansen if (sa->create) { 454349a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 45445d13a37bSArne Jansen } else { 45453efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 45465d13a37bSArne Jansen } 45475d13a37bSArne Jansen 45483a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 45495d13a37bSArne Jansen if (err && !ret) 45505d13a37bSArne Jansen ret = err; 45515d13a37bSArne Jansen 45525d13a37bSArne Jansen out: 45535d13a37bSArne Jansen kfree(sa); 4554905b0ddaSMiao Xie drop_write: 4555905b0ddaSMiao Xie mnt_drop_write_file(file); 45565d13a37bSArne Jansen return ret; 45575d13a37bSArne Jansen } 45585d13a37bSArne Jansen 4559905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 45605d13a37bSArne Jansen { 45610b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45620b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 45635d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 45645d13a37bSArne Jansen struct btrfs_trans_handle *trans; 45655d13a37bSArne Jansen int ret; 45665d13a37bSArne Jansen int err; 45675d13a37bSArne Jansen u64 qgroupid; 45685d13a37bSArne Jansen 45695d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 45705d13a37bSArne Jansen return -EPERM; 45715d13a37bSArne Jansen 4572905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4573905b0ddaSMiao Xie if (ret) 4574905b0ddaSMiao Xie return ret; 45755d13a37bSArne Jansen 45765d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4577905b0ddaSMiao Xie if (IS_ERR(sa)) { 4578905b0ddaSMiao Xie ret = PTR_ERR(sa); 4579905b0ddaSMiao Xie goto drop_write; 4580905b0ddaSMiao Xie } 45815d13a37bSArne Jansen 45825d13a37bSArne Jansen trans = btrfs_join_transaction(root); 45835d13a37bSArne Jansen if (IS_ERR(trans)) { 45845d13a37bSArne Jansen ret = PTR_ERR(trans); 45855d13a37bSArne Jansen goto out; 45865d13a37bSArne Jansen } 45875d13a37bSArne Jansen 45885d13a37bSArne Jansen qgroupid = sa->qgroupid; 45895d13a37bSArne Jansen if (!qgroupid) { 45905d13a37bSArne Jansen /* take the current subvol as qgroup */ 45915d13a37bSArne Jansen qgroupid = root->root_key.objectid; 45925d13a37bSArne Jansen } 45935d13a37bSArne Jansen 4594f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 45955d13a37bSArne Jansen 45963a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 45975d13a37bSArne Jansen if (err && !ret) 45985d13a37bSArne Jansen ret = err; 45995d13a37bSArne Jansen 46005d13a37bSArne Jansen out: 46015d13a37bSArne Jansen kfree(sa); 4602905b0ddaSMiao Xie drop_write: 4603905b0ddaSMiao Xie mnt_drop_write_file(file); 46045d13a37bSArne Jansen return ret; 46055d13a37bSArne Jansen } 46065d13a37bSArne Jansen 46072f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 46082f232036SJan Schmidt { 46090b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46100b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 46112f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 46122f232036SJan Schmidt int ret; 46132f232036SJan Schmidt 46142f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 46152f232036SJan Schmidt return -EPERM; 46162f232036SJan Schmidt 46172f232036SJan Schmidt ret = mnt_want_write_file(file); 46182f232036SJan Schmidt if (ret) 46192f232036SJan Schmidt return ret; 46202f232036SJan Schmidt 46212f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 46222f232036SJan Schmidt if (IS_ERR(qsa)) { 46232f232036SJan Schmidt ret = PTR_ERR(qsa); 46242f232036SJan Schmidt goto drop_write; 46252f232036SJan Schmidt } 46262f232036SJan Schmidt 46272f232036SJan Schmidt if (qsa->flags) { 46282f232036SJan Schmidt ret = -EINVAL; 46292f232036SJan Schmidt goto out; 46302f232036SJan Schmidt } 46312f232036SJan Schmidt 46320b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 46332f232036SJan Schmidt 46342f232036SJan Schmidt out: 46352f232036SJan Schmidt kfree(qsa); 46362f232036SJan Schmidt drop_write: 46372f232036SJan Schmidt mnt_drop_write_file(file); 46382f232036SJan Schmidt return ret; 46392f232036SJan Schmidt } 46402f232036SJan Schmidt 4641b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4642b929c1d8SMarcos Paulo de Souza void __user *arg) 46432f232036SJan Schmidt { 46440afb603aSGoldwyn Rodrigues struct btrfs_ioctl_quota_rescan_args qsa = {0}; 46452f232036SJan Schmidt 46462f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 46472f232036SJan Schmidt return -EPERM; 46482f232036SJan Schmidt 46490b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 46500afb603aSGoldwyn Rodrigues qsa.flags = 1; 46510afb603aSGoldwyn Rodrigues qsa.progress = fs_info->qgroup_rescan_progress.objectid; 46522f232036SJan Schmidt } 46532f232036SJan Schmidt 46540afb603aSGoldwyn Rodrigues if (copy_to_user(arg, &qsa, sizeof(qsa))) 4655991a3daeSAnand Jain return -EFAULT; 46562f232036SJan Schmidt 4657991a3daeSAnand Jain return 0; 46582f232036SJan Schmidt } 46592f232036SJan Schmidt 4660b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4661b929c1d8SMarcos Paulo de Souza void __user *arg) 466257254b6eSJan Schmidt { 466357254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 466457254b6eSJan Schmidt return -EPERM; 466557254b6eSJan Schmidt 46660b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 466757254b6eSJan Schmidt } 466857254b6eSJan Schmidt 4669abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4670e4fed17aSChristian Brauner struct user_namespace *mnt_userns, 4671abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 46728ea05e3aSAlexander Block { 4673496ad9aaSAl Viro struct inode *inode = file_inode(file); 46740b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 46758ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 46768ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 46778ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 467895582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 46798ea05e3aSAlexander Block int ret = 0; 4680dd5f9615SStefan Behrens int received_uuid_changed; 46818ea05e3aSAlexander Block 4682e4fed17aSChristian Brauner if (!inode_owner_or_capable(mnt_userns, inode)) 4683bd60ea0fSDavid Sterba return -EPERM; 4684bd60ea0fSDavid Sterba 46858ea05e3aSAlexander Block ret = mnt_want_write_file(file); 46868ea05e3aSAlexander Block if (ret < 0) 46878ea05e3aSAlexander Block return ret; 46888ea05e3aSAlexander Block 46890b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 46908ea05e3aSAlexander Block 46914a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 46928ea05e3aSAlexander Block ret = -EINVAL; 46938ea05e3aSAlexander Block goto out; 46948ea05e3aSAlexander Block } 46958ea05e3aSAlexander Block 46968ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 46978ea05e3aSAlexander Block ret = -EROFS; 46988ea05e3aSAlexander Block goto out; 46998ea05e3aSAlexander Block } 47008ea05e3aSAlexander Block 4701dd5f9615SStefan Behrens /* 4702dd5f9615SStefan Behrens * 1 - root item 4703dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4704dd5f9615SStefan Behrens */ 4705dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 47068ea05e3aSAlexander Block if (IS_ERR(trans)) { 47078ea05e3aSAlexander Block ret = PTR_ERR(trans); 47088ea05e3aSAlexander Block trans = NULL; 47098ea05e3aSAlexander Block goto out; 47108ea05e3aSAlexander Block } 47118ea05e3aSAlexander Block 47128ea05e3aSAlexander Block sa->rtransid = trans->transid; 47138ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 47148ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 47158ea05e3aSAlexander Block 4716dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4717dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4718dd5f9615SStefan Behrens if (received_uuid_changed && 4719d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4720d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4721dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4722dd5f9615SStefan Behrens root->root_key.objectid); 4723d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4724d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4725d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4726d87ff758SNikolay Borisov goto out; 4727d87ff758SNikolay Borisov } 4728d87ff758SNikolay Borisov } 47298ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 47308ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 47318ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 47323cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 47333cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 47343cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 47353cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 47368ea05e3aSAlexander Block 47370b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 47388ea05e3aSAlexander Block &root->root_key, &root->root_item); 47398ea05e3aSAlexander Block if (ret < 0) { 47403a45bb20SJeff Mahoney btrfs_end_transaction(trans); 47418ea05e3aSAlexander Block goto out; 4742dd5f9615SStefan Behrens } 4743dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4744cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4745dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4746dd5f9615SStefan Behrens root->root_key.objectid); 4747dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 474866642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4749efd38150SNikolay Borisov btrfs_end_transaction(trans); 4750dd5f9615SStefan Behrens goto out; 4751dd5f9615SStefan Behrens } 4752dd5f9615SStefan Behrens } 47533a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4754abccd00fSHugo Mills out: 47550b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4756abccd00fSHugo Mills mnt_drop_write_file(file); 4757abccd00fSHugo Mills return ret; 4758abccd00fSHugo Mills } 4759abccd00fSHugo Mills 4760abccd00fSHugo Mills #ifdef CONFIG_64BIT 4761abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4762abccd00fSHugo Mills void __user *arg) 4763abccd00fSHugo Mills { 4764abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4765abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4766abccd00fSHugo Mills int ret = 0; 4767abccd00fSHugo Mills 4768abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 47697b9ea627SShailendra Verma if (IS_ERR(args32)) 47707b9ea627SShailendra Verma return PTR_ERR(args32); 4771abccd00fSHugo Mills 47728d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 477384dbeb87SDan Carpenter if (!args64) { 477484dbeb87SDan Carpenter ret = -ENOMEM; 4775abccd00fSHugo Mills goto out; 4776abccd00fSHugo Mills } 4777abccd00fSHugo Mills 4778abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4779abccd00fSHugo Mills args64->stransid = args32->stransid; 4780abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4781abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4782abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4783abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4784abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4785abccd00fSHugo Mills args64->flags = args32->flags; 4786abccd00fSHugo Mills 4787e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), args64); 4788abccd00fSHugo Mills if (ret) 4789abccd00fSHugo Mills goto out; 4790abccd00fSHugo Mills 4791abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4792abccd00fSHugo Mills args32->stransid = args64->stransid; 4793abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4794abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4795abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4796abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4797abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4798abccd00fSHugo Mills args32->flags = args64->flags; 4799abccd00fSHugo Mills 4800abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4801abccd00fSHugo Mills if (ret) 4802abccd00fSHugo Mills ret = -EFAULT; 4803abccd00fSHugo Mills 4804abccd00fSHugo Mills out: 4805abccd00fSHugo Mills kfree(args32); 4806abccd00fSHugo Mills kfree(args64); 4807abccd00fSHugo Mills return ret; 4808abccd00fSHugo Mills } 4809abccd00fSHugo Mills #endif 4810abccd00fSHugo Mills 4811abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4812abccd00fSHugo Mills void __user *arg) 4813abccd00fSHugo Mills { 4814abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4815abccd00fSHugo Mills int ret = 0; 4816abccd00fSHugo Mills 4817abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 48187b9ea627SShailendra Verma if (IS_ERR(sa)) 48197b9ea627SShailendra Verma return PTR_ERR(sa); 4820abccd00fSHugo Mills 4821e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), sa); 4822abccd00fSHugo Mills 4823abccd00fSHugo Mills if (ret) 4824abccd00fSHugo Mills goto out; 4825abccd00fSHugo Mills 48268ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 48278ea05e3aSAlexander Block if (ret) 48288ea05e3aSAlexander Block ret = -EFAULT; 48298ea05e3aSAlexander Block 48308ea05e3aSAlexander Block out: 48318ea05e3aSAlexander Block kfree(sa); 48328ea05e3aSAlexander Block return ret; 48338ea05e3aSAlexander Block } 48348ea05e3aSAlexander Block 4835b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4836b929c1d8SMarcos Paulo de Souza void __user *arg) 4837867ab667Sjeff.liu { 4838a1b83ac5SAnand Jain size_t len; 4839867ab667Sjeff.liu int ret; 4840a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4841a1b83ac5SAnand Jain 48420b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 48430b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 48440b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4845a1b83ac5SAnand Jain 4846a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4847867ab667Sjeff.liu 4848867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 48490b246afaSJeff Mahoney btrfs_warn(fs_info, 48500b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 48510b246afaSJeff Mahoney --len); 4852867ab667Sjeff.liu } 4853867ab667Sjeff.liu 4854867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4855867ab667Sjeff.liu 4856867ab667Sjeff.liu return ret ? -EFAULT : 0; 4857867ab667Sjeff.liu } 4858867ab667Sjeff.liu 4859a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4860a8bfd4abSjeff.liu { 48610b246afaSJeff Mahoney struct inode *inode = file_inode(file); 48620b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 48630b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 48640b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4865a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4866a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4867a8bfd4abSjeff.liu int ret; 4868a8bfd4abSjeff.liu 4869a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4870a8bfd4abSjeff.liu return -EPERM; 4871a8bfd4abSjeff.liu 4872a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4873a8bfd4abSjeff.liu return -EFAULT; 4874a8bfd4abSjeff.liu 4875a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 48760b246afaSJeff Mahoney btrfs_err(fs_info, 48775d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4878a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4879a8bfd4abSjeff.liu return -EINVAL; 4880a8bfd4abSjeff.liu } 4881a8bfd4abSjeff.liu 4882a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4883a8bfd4abSjeff.liu if (ret) 4884a8bfd4abSjeff.liu return ret; 4885a8bfd4abSjeff.liu 4886a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4887a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4888a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4889a8bfd4abSjeff.liu goto out_unlock; 4890a8bfd4abSjeff.liu } 4891a8bfd4abSjeff.liu 48920b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4893a8bfd4abSjeff.liu strcpy(super_block->label, label); 48940b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 48953a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4896a8bfd4abSjeff.liu 4897a8bfd4abSjeff.liu out_unlock: 4898a8bfd4abSjeff.liu mnt_drop_write_file(file); 4899a8bfd4abSjeff.liu return ret; 4900a8bfd4abSjeff.liu } 4901a8bfd4abSjeff.liu 49022eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 49032eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 49042eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 49052eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 49062eaa055fSJeff Mahoney 4907d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 49082eaa055fSJeff Mahoney { 49094d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 49102eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 49112eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 49122eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 49132eaa055fSJeff Mahoney }; 49142eaa055fSJeff Mahoney 49152eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 49162eaa055fSJeff Mahoney return -EFAULT; 49172eaa055fSJeff Mahoney 49182eaa055fSJeff Mahoney return 0; 49192eaa055fSJeff Mahoney } 49202eaa055fSJeff Mahoney 4921b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4922b929c1d8SMarcos Paulo de Souza void __user *arg) 49232eaa055fSJeff Mahoney { 49240b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 49252eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 49262eaa055fSJeff Mahoney 49272eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 49282eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 49292eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 49302eaa055fSJeff Mahoney 49312eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 49322eaa055fSJeff Mahoney return -EFAULT; 49332eaa055fSJeff Mahoney 49342eaa055fSJeff Mahoney return 0; 49352eaa055fSJeff Mahoney } 49362eaa055fSJeff Mahoney 49372ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 49383b02a68aSJeff Mahoney enum btrfs_feature_set set, 49392eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 49402eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 49412eaa055fSJeff Mahoney { 4942f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 49433b02a68aSJeff Mahoney char *names; 49442eaa055fSJeff Mahoney u64 disallowed, unsupported; 49452eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 49462eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 49472eaa055fSJeff Mahoney 49482eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 49492eaa055fSJeff Mahoney if (unsupported) { 49503b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 49513b02a68aSJeff Mahoney if (names) { 49520b246afaSJeff Mahoney btrfs_warn(fs_info, 49533b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 49543b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 49553b02a68aSJeff Mahoney kfree(names); 49563b02a68aSJeff Mahoney } else 49570b246afaSJeff Mahoney btrfs_warn(fs_info, 49582eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 49592eaa055fSJeff Mahoney type, unsupported); 49602eaa055fSJeff Mahoney return -EOPNOTSUPP; 49612eaa055fSJeff Mahoney } 49622eaa055fSJeff Mahoney 49632eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 49642eaa055fSJeff Mahoney if (disallowed) { 49653b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 49663b02a68aSJeff Mahoney if (names) { 49670b246afaSJeff Mahoney btrfs_warn(fs_info, 49683b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 49693b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 49703b02a68aSJeff Mahoney kfree(names); 49713b02a68aSJeff Mahoney } else 49720b246afaSJeff Mahoney btrfs_warn(fs_info, 49732eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 49742eaa055fSJeff Mahoney type, disallowed); 49752eaa055fSJeff Mahoney return -EPERM; 49762eaa055fSJeff Mahoney } 49772eaa055fSJeff Mahoney 49782eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 49792eaa055fSJeff Mahoney if (disallowed) { 49803b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 49813b02a68aSJeff Mahoney if (names) { 49820b246afaSJeff Mahoney btrfs_warn(fs_info, 49833b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 49843b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 49853b02a68aSJeff Mahoney kfree(names); 49863b02a68aSJeff Mahoney } else 49870b246afaSJeff Mahoney btrfs_warn(fs_info, 49882eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 49892eaa055fSJeff Mahoney type, disallowed); 49902eaa055fSJeff Mahoney return -EPERM; 49912eaa055fSJeff Mahoney } 49922eaa055fSJeff Mahoney 49932eaa055fSJeff Mahoney return 0; 49942eaa055fSJeff Mahoney } 49952eaa055fSJeff Mahoney 49962ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 49972ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 49982eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 49992eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 50002eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 50012eaa055fSJeff Mahoney 50022eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 50032eaa055fSJeff Mahoney { 50040b246afaSJeff Mahoney struct inode *inode = file_inode(file); 50050b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 50060b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 50070b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 50082eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 50092eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 50102eaa055fSJeff Mahoney u64 newflags; 50112eaa055fSJeff Mahoney int ret; 50122eaa055fSJeff Mahoney 50132eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 50142eaa055fSJeff Mahoney return -EPERM; 50152eaa055fSJeff Mahoney 50162eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 50172eaa055fSJeff Mahoney return -EFAULT; 50182eaa055fSJeff Mahoney 50192eaa055fSJeff Mahoney /* Nothing to do */ 50202eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 50212eaa055fSJeff Mahoney !flags[0].incompat_flags) 50222eaa055fSJeff Mahoney return 0; 50232eaa055fSJeff Mahoney 50242ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 50252eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 50262eaa055fSJeff Mahoney if (ret) 50272eaa055fSJeff Mahoney return ret; 50282eaa055fSJeff Mahoney 50292ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 50302eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 50312eaa055fSJeff Mahoney if (ret) 50322eaa055fSJeff Mahoney return ret; 50332eaa055fSJeff Mahoney 50342ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 50352eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 50362eaa055fSJeff Mahoney if (ret) 50372eaa055fSJeff Mahoney return ret; 50382eaa055fSJeff Mahoney 50397ab19625SDavid Sterba ret = mnt_want_write_file(file); 50407ab19625SDavid Sterba if (ret) 50417ab19625SDavid Sterba return ret; 50427ab19625SDavid Sterba 50438051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 50447ab19625SDavid Sterba if (IS_ERR(trans)) { 50457ab19625SDavid Sterba ret = PTR_ERR(trans); 50467ab19625SDavid Sterba goto out_drop_write; 50477ab19625SDavid Sterba } 50482eaa055fSJeff Mahoney 50490b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 50502eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 50512eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 50522eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 50532eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 50542eaa055fSJeff Mahoney 50552eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 50562eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 50572eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 50582eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 50592eaa055fSJeff Mahoney 50602eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 50612eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 50622eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 50632eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 50640b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 50652eaa055fSJeff Mahoney 50663a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 50677ab19625SDavid Sterba out_drop_write: 50687ab19625SDavid Sterba mnt_drop_write_file(file); 50697ab19625SDavid Sterba 50707ab19625SDavid Sterba return ret; 50712eaa055fSJeff Mahoney } 50722eaa055fSJeff Mahoney 50732351f431SJosef Bacik static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) 50742351f431SJosef Bacik { 50752351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 50762351f431SJosef Bacik int ret; 50772351f431SJosef Bacik 50782351f431SJosef Bacik if (compat) { 50792351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 50802351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 50812351f431SJosef Bacik 50822351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 50832351f431SJosef Bacik if (ret) 50842351f431SJosef Bacik return -EFAULT; 50852351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 50862351f431SJosef Bacik if (!arg) 50872351f431SJosef Bacik return -ENOMEM; 50882351f431SJosef Bacik arg->send_fd = args32.send_fd; 50892351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 50902351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 50912351f431SJosef Bacik arg->parent_root = args32.parent_root; 50922351f431SJosef Bacik arg->flags = args32.flags; 50932351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 50942351f431SJosef Bacik sizeof(args32.reserved)); 50952351f431SJosef Bacik #else 50962351f431SJosef Bacik return -ENOTTY; 50972351f431SJosef Bacik #endif 50982351f431SJosef Bacik } else { 50992351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 51002351f431SJosef Bacik if (IS_ERR(arg)) 51012351f431SJosef Bacik return PTR_ERR(arg); 51022351f431SJosef Bacik } 51032351f431SJosef Bacik ret = btrfs_ioctl_send(file, arg); 51042351f431SJosef Bacik kfree(arg); 51052351f431SJosef Bacik return ret; 51062351f431SJosef Bacik } 51072351f431SJosef Bacik 5108f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 5109f46b5a66SChristoph Hellwig cmd, unsigned long arg) 5110f46b5a66SChristoph Hellwig { 51110b246afaSJeff Mahoney struct inode *inode = file_inode(file); 51120b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 51130b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 51144bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 5115f46b5a66SChristoph Hellwig 5116f46b5a66SChristoph Hellwig switch (cmd) { 51176cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 51186cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 511940cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 5120b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 512140cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 512240cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 5123f7039b1dSLi Dongyang case FITRIM: 5124b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 5125f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 5126fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 5127fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 5128fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 51293de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 5130fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 51316f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 51326f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 513376dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 5134949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 5135949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 5136949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 51370caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 51380caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 51390caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 51400caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 51416ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 51426ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 5143f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 51441e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 51451e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 51461e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 5147f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 5148198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 5149f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 51502ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 5151f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 5152da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 51536b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 51546b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 5155475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 51562ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 5157475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 51582ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 5159f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 51609ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 5161ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 5162ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 5163cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 5164cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 5165ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 5166ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 5167d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 5168d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 5169d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 5170d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 5171d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 5172d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 51731406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 51742ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 51759b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 51769b199859SFilipe David Borba Manana int ret; 51779b199859SFilipe David Borba Manana 51789db4dc24SNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 51799b199859SFilipe David Borba Manana if (ret) 51809b199859SFilipe David Borba Manana return ret; 51810b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 51822fad4e83SDavid Sterba /* 51832fad4e83SDavid Sterba * The transaction thread may want to do more work, 518401327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 51852fad4e83SDavid Sterba * processing uncleaned subvols. 51862fad4e83SDavid Sterba */ 51870b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 51889b199859SFilipe David Borba Manana return ret; 51899b199859SFilipe David Borba Manana } 519046204592SSage Weil case BTRFS_IOC_START_SYNC: 51919a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 519246204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 51932ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 5194475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 5195b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 5196475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 51972ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 5198475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 51992ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 5200c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 52019ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 5202837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 52032ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 520419a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 52052ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 52068ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 52078ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 5208abccd00fSHugo Mills #ifdef CONFIG_64BIT 5209abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 5210abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 5211abccd00fSHugo Mills #endif 521231db9f7cSAlexander Block case BTRFS_IOC_SEND: 52132351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, false); 52142351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 52152351f431SJosef Bacik case BTRFS_IOC_SEND_32: 52162351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, true); 52172351f431SJosef Bacik #endif 5218c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 52192ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 52205d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5221905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 52225d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5223905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 52245d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5225905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 52265d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5227905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 52282f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 52292f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 52302f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 5231b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 523257254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 5233b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 52343f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 52352ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 52362eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 5237d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 52382eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 5239b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 52402eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 52412eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5242b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 5243b64ec075STomohiro Misono return btrfs_ioctl_get_subvol_info(file, argp); 524442e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 524542e4b520STomohiro Misono return btrfs_ioctl_get_subvol_rootref(file, argp); 524623d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 524723d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 524814605409SBoris Burkov case FS_IOC_ENABLE_VERITY: 524914605409SBoris Burkov return fsverity_ioctl_enable(file, (const void __user *)argp); 525014605409SBoris Burkov case FS_IOC_MEASURE_VERITY: 525114605409SBoris Burkov return fsverity_ioctl_measure(file, argp); 5252f46b5a66SChristoph Hellwig } 5253f46b5a66SChristoph Hellwig 5254f46b5a66SChristoph Hellwig return -ENOTTY; 5255f46b5a66SChristoph Hellwig } 52564c63c245SLuke Dashjr 52574c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 52584c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 52594c63c245SLuke Dashjr { 52602a362249SJeff Mahoney /* 52612a362249SJeff Mahoney * These all access 32-bit values anyway so no further 52622a362249SJeff Mahoney * handling is necessary. 52632a362249SJeff Mahoney */ 52644c63c245SLuke Dashjr switch (cmd) { 52654c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 52664c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 52674c63c245SLuke Dashjr break; 52684c63c245SLuke Dashjr } 52694c63c245SLuke Dashjr 52704c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 52714c63c245SLuke Dashjr } 52724c63c245SLuke Dashjr #endif 5273