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> 30f46b5a66SChristoph Hellwig #include "ctree.h" 31f46b5a66SChristoph Hellwig #include "disk-io.h" 32949964c9SMarcos Paulo de Souza #include "export.h" 33f46b5a66SChristoph Hellwig #include "transaction.h" 34f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 35f46b5a66SChristoph Hellwig #include "print-tree.h" 36f46b5a66SChristoph Hellwig #include "volumes.h" 37925baeddSChris Mason #include "locking.h" 38d7728c96SJan Schmidt #include "backref.h" 39606686eeSJosef Bacik #include "rcu-string.h" 4031db9f7cSAlexander Block #include "send.h" 413f6bcfbdSStefan Behrens #include "dev-replace.h" 4263541927SFilipe David Borba Manana #include "props.h" 433b02a68aSJeff Mahoney #include "sysfs.h" 44fcebe456SJosef Bacik #include "qgroup.h" 451ec9a1aeSFilipe Manana #include "tree-log.h" 46ebb8765bSAnand Jain #include "compression.h" 478719aaaeSJosef Bacik #include "space-info.h" 4886736342SJosef Bacik #include "delalloc-space.h" 49aac0023cSJosef Bacik #include "block-group.h" 50f46b5a66SChristoph Hellwig 51abccd00fSHugo Mills #ifdef CONFIG_64BIT 52abccd00fSHugo Mills /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI 53abccd00fSHugo Mills * structures are incorrect, as the timespec structure from userspace 54abccd00fSHugo Mills * is 4 bytes too small. We define these alternatives here to teach 55abccd00fSHugo Mills * the kernel about the 32-bit struct packing. 56abccd00fSHugo Mills */ 57abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 { 58abccd00fSHugo Mills __u64 sec; 59abccd00fSHugo Mills __u32 nsec; 60abccd00fSHugo Mills } __attribute__ ((__packed__)); 61abccd00fSHugo Mills 62abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 { 63abccd00fSHugo Mills char uuid[BTRFS_UUID_SIZE]; /* in */ 64abccd00fSHugo Mills __u64 stransid; /* in */ 65abccd00fSHugo Mills __u64 rtransid; /* out */ 66abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 stime; /* in */ 67abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 rtime; /* out */ 68abccd00fSHugo Mills __u64 flags; /* in */ 69abccd00fSHugo Mills __u64 reserved[16]; /* in */ 70abccd00fSHugo Mills } __attribute__ ((__packed__)); 71abccd00fSHugo Mills 72abccd00fSHugo Mills #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ 73abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32) 74abccd00fSHugo Mills #endif 75abccd00fSHugo Mills 762351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 772351f431SJosef Bacik struct btrfs_ioctl_send_args_32 { 782351f431SJosef Bacik __s64 send_fd; /* in */ 792351f431SJosef Bacik __u64 clone_sources_count; /* in */ 802351f431SJosef Bacik compat_uptr_t clone_sources; /* in */ 812351f431SJosef Bacik __u64 parent_root; /* in */ 822351f431SJosef Bacik __u64 flags; /* in */ 832351f431SJosef Bacik __u64 reserved[4]; /* in */ 842351f431SJosef Bacik } __attribute__ ((__packed__)); 852351f431SJosef Bacik 862351f431SJosef Bacik #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \ 872351f431SJosef Bacik struct btrfs_ioctl_send_args_32) 882351f431SJosef Bacik #endif 89abccd00fSHugo Mills 906cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 911905a0f7SDavid Sterba static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode, 921905a0f7SDavid Sterba unsigned int flags) 936cbff00fSChristoph Hellwig { 941905a0f7SDavid Sterba if (S_ISDIR(inode->i_mode)) 956cbff00fSChristoph Hellwig return flags; 961905a0f7SDavid Sterba else if (S_ISREG(inode->i_mode)) 976cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 986cbff00fSChristoph Hellwig else 996cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 1006cbff00fSChristoph Hellwig } 101f46b5a66SChristoph Hellwig 1026cbff00fSChristoph Hellwig /* 103a157d4fdSDavid Sterba * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS 104a157d4fdSDavid Sterba * ioctl. 1056cbff00fSChristoph Hellwig */ 106a157d4fdSDavid Sterba static unsigned int btrfs_inode_flags_to_fsflags(unsigned int flags) 1076cbff00fSChristoph Hellwig { 1086cbff00fSChristoph Hellwig unsigned int iflags = 0; 1096cbff00fSChristoph Hellwig 1106cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 1116cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 1126cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 1136cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 1146cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 1156cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 1166cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 1176cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 1186cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 1196cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 1206cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 1216cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 122d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 123d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 124d0092bddSLi Zefan 12513f48dc9SSatoru Takeuchi if (flags & BTRFS_INODE_NOCOMPRESS) 126d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 12713f48dc9SSatoru Takeuchi else if (flags & BTRFS_INODE_COMPRESS) 12813f48dc9SSatoru Takeuchi iflags |= FS_COMPR_FL; 1296cbff00fSChristoph Hellwig 1306cbff00fSChristoph Hellwig return iflags; 1316cbff00fSChristoph Hellwig } 1326cbff00fSChristoph Hellwig 1336cbff00fSChristoph Hellwig /* 1346cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1356cbff00fSChristoph Hellwig */ 1367b6a221eSDavid Sterba void btrfs_sync_inode_flags_to_i_flags(struct inode *inode) 1376cbff00fSChristoph Hellwig { 1385c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 1393cc79392SFilipe Manana unsigned int new_fl = 0; 1406cbff00fSChristoph Hellwig 1415c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_SYNC) 1423cc79392SFilipe Manana new_fl |= S_SYNC; 1435c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_IMMUTABLE) 1443cc79392SFilipe Manana new_fl |= S_IMMUTABLE; 1455c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_APPEND) 1463cc79392SFilipe Manana new_fl |= S_APPEND; 1475c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_NOATIME) 1483cc79392SFilipe Manana new_fl |= S_NOATIME; 1495c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_DIRSYNC) 1503cc79392SFilipe Manana new_fl |= S_DIRSYNC; 1513cc79392SFilipe Manana 1523cc79392SFilipe Manana set_mask_bits(&inode->i_flags, 1533cc79392SFilipe Manana S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC, 1543cc79392SFilipe Manana new_fl); 1556cbff00fSChristoph Hellwig } 1566cbff00fSChristoph Hellwig 157f37c563bSDavid Sterba /* 158f37c563bSDavid Sterba * Check if @flags are a supported and valid set of FS_*_FL flags and that 159f37c563bSDavid Sterba * the old and new flags are not conflicting 160f37c563bSDavid Sterba */ 161f37c563bSDavid Sterba static int check_fsflags(unsigned int old_flags, unsigned int flags) 16275e7cb7fSLiu Bo { 16375e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 16475e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 16575e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 166e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 167e1e8fb6aSLi Zefan FS_NOCOW_FL)) 16875e7cb7fSLiu Bo return -EOPNOTSUPP; 16975e7cb7fSLiu Bo 170f37c563bSDavid Sterba /* COMPR and NOCOMP on new/old are valid */ 17175e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 17275e7cb7fSLiu Bo return -EINVAL; 17375e7cb7fSLiu Bo 174f37c563bSDavid Sterba if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL)) 175f37c563bSDavid Sterba return -EINVAL; 176f37c563bSDavid Sterba 177f37c563bSDavid Sterba /* NOCOW and compression options are mutually exclusive */ 178f37c563bSDavid Sterba if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 179f37c563bSDavid Sterba return -EINVAL; 180f37c563bSDavid Sterba if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 181f37c563bSDavid Sterba return -EINVAL; 182f37c563bSDavid Sterba 18375e7cb7fSLiu Bo return 0; 18475e7cb7fSLiu Bo } 18575e7cb7fSLiu Bo 186d206e9c9SNaohiro Aota static int check_fsflags_compatible(struct btrfs_fs_info *fs_info, 187d206e9c9SNaohiro Aota unsigned int flags) 188d206e9c9SNaohiro Aota { 189d206e9c9SNaohiro Aota if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL)) 190d206e9c9SNaohiro Aota return -EPERM; 191d206e9c9SNaohiro Aota 192d206e9c9SNaohiro Aota return 0; 193d206e9c9SNaohiro Aota } 194d206e9c9SNaohiro Aota 19597fc2977SMiklos Szeredi /* 19697fc2977SMiklos Szeredi * Set flags/xflags from the internal inode flags. The remaining items of 19797fc2977SMiklos Szeredi * fsxattr are zeroed. 19897fc2977SMiklos Szeredi */ 19997fc2977SMiklos Szeredi int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa) 2006cbff00fSChristoph Hellwig { 20197fc2977SMiklos Szeredi struct btrfs_inode *binode = BTRFS_I(d_inode(dentry)); 20297fc2977SMiklos Szeredi 20397fc2977SMiklos Szeredi fileattr_fill_flags(fa, btrfs_inode_flags_to_fsflags(binode->flags)); 20497fc2977SMiklos Szeredi return 0; 20597fc2977SMiklos Szeredi } 20697fc2977SMiklos Szeredi 20797fc2977SMiklos Szeredi int btrfs_fileattr_set(struct user_namespace *mnt_userns, 20897fc2977SMiklos Szeredi struct dentry *dentry, struct fileattr *fa) 20997fc2977SMiklos Szeredi { 21097fc2977SMiklos Szeredi struct inode *inode = d_inode(dentry); 2110b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 2125c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 2135c57b8b6SDavid Sterba struct btrfs_root *root = binode->root; 2146cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 2155aca2842SDarrick J. Wong unsigned int fsflags, old_fsflags; 2166cbff00fSChristoph Hellwig int ret; 217ff9fef55SAnand Jain const char *comp = NULL; 218f37c563bSDavid Sterba u32 binode_flags; 2196cbff00fSChristoph Hellwig 220b83cc969SLi Zefan if (btrfs_root_readonly(root)) 221b83cc969SLi Zefan return -EROFS; 222b83cc969SLi Zefan 22397fc2977SMiklos Szeredi if (fileattr_has_fsx(fa)) 22497fc2977SMiklos Szeredi return -EOPNOTSUPP; 2256cbff00fSChristoph Hellwig 22697fc2977SMiklos Szeredi fsflags = btrfs_mask_fsflags_for_type(inode, fa->flags); 22797fc2977SMiklos Szeredi old_fsflags = btrfs_inode_flags_to_fsflags(binode->flags); 22897fc2977SMiklos Szeredi ret = check_fsflags(old_fsflags, fsflags); 229e7848683SJan Kara if (ret) 230e7848683SJan Kara return ret; 231e7848683SJan Kara 232d206e9c9SNaohiro Aota ret = check_fsflags_compatible(fs_info, fsflags); 233d206e9c9SNaohiro Aota if (ret) 23497fc2977SMiklos Szeredi return ret; 235d206e9c9SNaohiro Aota 236f37c563bSDavid Sterba binode_flags = binode->flags; 2375c57b8b6SDavid Sterba if (fsflags & FS_SYNC_FL) 238d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_SYNC; 2396cbff00fSChristoph Hellwig else 240d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_SYNC; 2415c57b8b6SDavid Sterba if (fsflags & FS_IMMUTABLE_FL) 242d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_IMMUTABLE; 2436cbff00fSChristoph Hellwig else 244d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_IMMUTABLE; 2455c57b8b6SDavid Sterba if (fsflags & FS_APPEND_FL) 246d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_APPEND; 2476cbff00fSChristoph Hellwig else 248d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_APPEND; 2495c57b8b6SDavid Sterba if (fsflags & FS_NODUMP_FL) 250d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODUMP; 2516cbff00fSChristoph Hellwig else 252d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODUMP; 2535c57b8b6SDavid Sterba if (fsflags & FS_NOATIME_FL) 254d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOATIME; 2556cbff00fSChristoph Hellwig else 256d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOATIME; 25797fc2977SMiklos Szeredi 25897fc2977SMiklos Szeredi /* If coming from FS_IOC_FSSETXATTR then skip unconverted flags */ 25997fc2977SMiklos Szeredi if (!fa->flags_valid) { 26097fc2977SMiklos Szeredi /* 1 item for the inode */ 26197fc2977SMiklos Szeredi trans = btrfs_start_transaction(root, 1); 262*9b8a233bSRitesh Harjani if (IS_ERR(trans)) 263*9b8a233bSRitesh Harjani return PTR_ERR(trans); 26497fc2977SMiklos Szeredi goto update_flags; 26597fc2977SMiklos Szeredi } 26697fc2977SMiklos Szeredi 2675c57b8b6SDavid Sterba if (fsflags & FS_DIRSYNC_FL) 268d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_DIRSYNC; 2696cbff00fSChristoph Hellwig else 270d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_DIRSYNC; 2715c57b8b6SDavid Sterba if (fsflags & FS_NOCOW_FL) { 27244e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 2737e97b8daSDavid Sterba /* 2747e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2757e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2767e97b8daSDavid Sterba * status of the file and will not set it. 2777e97b8daSDavid Sterba */ 2787e97b8daSDavid Sterba if (inode->i_size == 0) 279d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW | 280d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM; 2817e97b8daSDavid Sterba } else { 282d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW; 2837e97b8daSDavid Sterba } 2847e97b8daSDavid Sterba } else { 2857e97b8daSDavid Sterba /* 28601327610SNicholas D Steeves * Revert back under same assumptions as above 2877e97b8daSDavid Sterba */ 28844e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 2897e97b8daSDavid Sterba if (inode->i_size == 0) 290d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_NODATACOW | 291d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM); 2927e97b8daSDavid Sterba } else { 293d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODATACOW; 2947e97b8daSDavid Sterba } 2957e97b8daSDavid Sterba } 2966cbff00fSChristoph Hellwig 29775e7cb7fSLiu Bo /* 29875e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 29975e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 30075e7cb7fSLiu Bo * things smaller. 30175e7cb7fSLiu Bo */ 3025c57b8b6SDavid Sterba if (fsflags & FS_NOCOMP_FL) { 303d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_COMPRESS; 304d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOCOMPRESS; 3055c57b8b6SDavid Sterba } else if (fsflags & FS_COMPR_FL) { 30663541927SFilipe David Borba Manana 30797fc2977SMiklos Szeredi if (IS_SWAPFILE(inode)) 30897fc2977SMiklos Szeredi return -ETXTBSY; 309eede2bf3SOmar Sandoval 310d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_COMPRESS; 311d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOCOMPRESS; 31263541927SFilipe David Borba Manana 31393370509SDavid Sterba comp = btrfs_compress_type2str(fs_info->compress_type); 31493370509SDavid Sterba if (!comp || comp[0] == 0) 31593370509SDavid Sterba comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB); 316ebcb904dSLi Zefan } else { 317d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 31875e7cb7fSLiu Bo } 3196cbff00fSChristoph Hellwig 320ff9fef55SAnand Jain /* 321ff9fef55SAnand Jain * 1 for inode item 322ff9fef55SAnand Jain * 2 for properties 323ff9fef55SAnand Jain */ 324ff9fef55SAnand Jain trans = btrfs_start_transaction(root, 3); 32597fc2977SMiklos Szeredi if (IS_ERR(trans)) 32697fc2977SMiklos Szeredi return PTR_ERR(trans); 3276cbff00fSChristoph Hellwig 328ff9fef55SAnand Jain if (comp) { 329ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp, 330ff9fef55SAnand Jain strlen(comp), 0); 331ff9fef55SAnand Jain if (ret) { 332ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 333ff9fef55SAnand Jain goto out_end_trans; 334ff9fef55SAnand Jain } 335ff9fef55SAnand Jain } else { 336ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL, 337ff9fef55SAnand Jain 0, 0); 338ff9fef55SAnand Jain if (ret && ret != -ENODATA) { 339ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 340ff9fef55SAnand Jain goto out_end_trans; 341ff9fef55SAnand Jain } 342ff9fef55SAnand Jain } 343ff9fef55SAnand Jain 34497fc2977SMiklos Szeredi update_flags: 345d2b8fcfeSAnand Jain binode->flags = binode_flags; 3467b6a221eSDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 3470c4d2d95SJosef Bacik inode_inc_iversion(inode); 348c2050a45SDeepa Dinamani inode->i_ctime = current_time(inode); 3499a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); 3506cbff00fSChristoph Hellwig 351ff9fef55SAnand Jain out_end_trans: 3523a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3532d4e6f6aSliubo return ret; 3546cbff00fSChristoph Hellwig } 3556cbff00fSChristoph Hellwig 356c3e1f96cSGoldwyn Rodrigues bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, 357c3e1f96cSGoldwyn Rodrigues enum btrfs_exclusive_operation type) 358c3e1f96cSGoldwyn Rodrigues { 359c3e1f96cSGoldwyn Rodrigues return !cmpxchg(&fs_info->exclusive_operation, BTRFS_EXCLOP_NONE, type); 360c3e1f96cSGoldwyn Rodrigues } 361c3e1f96cSGoldwyn Rodrigues 362c3e1f96cSGoldwyn Rodrigues void btrfs_exclop_finish(struct btrfs_fs_info *fs_info) 363c3e1f96cSGoldwyn Rodrigues { 364c3e1f96cSGoldwyn Rodrigues WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE); 36566a2823cSGoldwyn Rodrigues sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation"); 366c3e1f96cSGoldwyn Rodrigues } 367c3e1f96cSGoldwyn Rodrigues 3686cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 3696cbff00fSChristoph Hellwig { 370496ad9aaSAl Viro struct inode *inode = file_inode(file); 3716cbff00fSChristoph Hellwig 3726cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 3736cbff00fSChristoph Hellwig } 374f46b5a66SChristoph Hellwig 375b929c1d8SMarcos Paulo de Souza static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, 376b929c1d8SMarcos Paulo de Souza void __user *arg) 377f7039b1dSLi Dongyang { 378f7039b1dSLi Dongyang struct btrfs_device *device; 379f7039b1dSLi Dongyang struct request_queue *q; 380f7039b1dSLi Dongyang struct fstrim_range range; 381f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 382f7039b1dSLi Dongyang u64 num_devices = 0; 383f7039b1dSLi Dongyang int ret; 384f7039b1dSLi Dongyang 385f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 386f7039b1dSLi Dongyang return -EPERM; 387f7039b1dSLi Dongyang 388f35f06c3SFilipe Manana /* 3891cb3dc3fSNaohiro Aota * btrfs_trim_block_group() depends on space cache, which is not 3901cb3dc3fSNaohiro Aota * available in zoned filesystem. So, disallow fitrim on a zoned 3911cb3dc3fSNaohiro Aota * filesystem for now. 3921cb3dc3fSNaohiro Aota */ 3931cb3dc3fSNaohiro Aota if (btrfs_is_zoned(fs_info)) 3941cb3dc3fSNaohiro Aota return -EOPNOTSUPP; 3951cb3dc3fSNaohiro Aota 3961cb3dc3fSNaohiro Aota /* 397f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 398f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 399f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 400f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 401f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 402f35f06c3SFilipe Manana */ 403f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 404f35f06c3SFilipe Manana return -EROFS; 405f35f06c3SFilipe Manana 4061f78160cSXiao Guangrong rcu_read_lock(); 4071f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 4081f78160cSXiao Guangrong dev_list) { 409f7039b1dSLi Dongyang if (!device->bdev) 410f7039b1dSLi Dongyang continue; 411f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 412f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 413f7039b1dSLi Dongyang num_devices++; 41450d0446eSSeraphime Kirkovski minlen = min_t(u64, q->limits.discard_granularity, 415f7039b1dSLi Dongyang minlen); 416f7039b1dSLi Dongyang } 417f7039b1dSLi Dongyang } 4181f78160cSXiao Guangrong rcu_read_unlock(); 419f4c697e6SLukas Czerner 420f7039b1dSLi Dongyang if (!num_devices) 421f7039b1dSLi Dongyang return -EOPNOTSUPP; 422f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 423f7039b1dSLi Dongyang return -EFAULT; 4246ba9fc8eSQu Wenruo 4256ba9fc8eSQu Wenruo /* 4266ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 4276ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 4286ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 4296ba9fc8eSQu Wenruo */ 4306ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 431f4c697e6SLukas Czerner return -EINVAL; 432f7039b1dSLi Dongyang 433f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 4342ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 435f7039b1dSLi Dongyang if (ret < 0) 436f7039b1dSLi Dongyang return ret; 437f7039b1dSLi Dongyang 438f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 439f7039b1dSLi Dongyang return -EFAULT; 440f7039b1dSLi Dongyang 441f7039b1dSLi Dongyang return 0; 442f7039b1dSLi Dongyang } 443f7039b1dSLi Dongyang 444e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 445dd5f9615SStefan Behrens { 44646e0f66aSChris Mason int i; 44746e0f66aSChris Mason 44846e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 44946e0f66aSChris Mason if (uuid[i]) 45046e0f66aSChris Mason return 0; 45146e0f66aSChris Mason } 45246e0f66aSChris Mason return 1; 453dd5f9615SStefan Behrens } 454dd5f9615SStefan Behrens 455d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 456cb8e7090SChristoph Hellwig struct dentry *dentry, 45752f75f4fSDavid Sterba const char *name, int namelen, 4588696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 459f46b5a66SChristoph Hellwig { 4600b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 461f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 462f46b5a66SChristoph Hellwig struct btrfs_key key; 46349a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 464f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 465f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 466d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 46776dda93cSYan, Zheng struct btrfs_root *new_root; 468d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 46995582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 4705662344bSTsutomu Itoh struct inode *inode; 471f46b5a66SChristoph Hellwig int ret; 472f46b5a66SChristoph Hellwig int err; 4732dfb1e43SQu Wenruo dev_t anon_dev = 0; 474f46b5a66SChristoph Hellwig u64 objectid; 4753de4586cSChris Mason u64 index = 0; 476f46b5a66SChristoph Hellwig 47749a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 47849a3c4d9SDavid Sterba if (!root_item) 47949a3c4d9SDavid Sterba return -ENOMEM; 48049a3c4d9SDavid Sterba 481543068a2SNikolay Borisov ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); 4822fbe8c8aSAl Viro if (ret) 48349a3c4d9SDavid Sterba goto fail_free; 4846a912213SJosef Bacik 4852dfb1e43SQu Wenruo ret = get_anon_bdev(&anon_dev); 4862dfb1e43SQu Wenruo if (ret < 0) 4872dfb1e43SQu Wenruo goto fail_free; 4882dfb1e43SQu Wenruo 489e09fe2d2SQu Wenruo /* 490e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 49101327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 492e09fe2d2SQu Wenruo */ 49349a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 49449a3c4d9SDavid Sterba ret = -ENOSPC; 49549a3c4d9SDavid Sterba goto fail_free; 49649a3c4d9SDavid Sterba } 497e09fe2d2SQu Wenruo 498d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 4999ed74f2dSJosef Bacik /* 500d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 501d5c12070SMiao Xie * of create_snapshot(). 5029ed74f2dSJosef Bacik */ 503c4c129dbSGu JinXiang ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false); 504d5c12070SMiao Xie if (ret) 50549a3c4d9SDavid Sterba goto fail_free; 506f46b5a66SChristoph Hellwig 507d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 508d5c12070SMiao Xie if (IS_ERR(trans)) { 509d5c12070SMiao Xie ret = PTR_ERR(trans); 510e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 51149a3c4d9SDavid Sterba goto fail_free; 512d5c12070SMiao Xie } 513d5c12070SMiao Xie trans->block_rsv = &block_rsv; 514d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 515f46b5a66SChristoph Hellwig 516a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 5176f72c7e2SArne Jansen if (ret) 5186f72c7e2SArne Jansen goto fail; 5196f72c7e2SArne Jansen 5209631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 5219631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 5228e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 5238e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 5248e8a1e31SJosef Bacik goto fail; 5258e8a1e31SJosef Bacik } 526f46b5a66SChristoph Hellwig 527f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 528f46b5a66SChristoph Hellwig 52949a3c4d9SDavid Sterba inode_item = &root_item->inode; 5303cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 5313cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 5323cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 533da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 5340b246afaSJeff Mahoney fs_info->nodesize); 5353cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 536f46b5a66SChristoph Hellwig 53749a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 53849a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 5393cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 54008fe4db1SLi Zefan 54149a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 54249a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 54349a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 54449a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 54549a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 54649a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 547f46b5a66SChristoph Hellwig 54849a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 54949a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 550807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 55149a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 55249a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 55349a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 55449a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 55549a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 556f46b5a66SChristoph Hellwig 557925baeddSChris Mason btrfs_tree_unlock(leaf); 558f46b5a66SChristoph Hellwig 55969948022SNikolay Borisov btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); 560f46b5a66SChristoph Hellwig 561f46b5a66SChristoph Hellwig key.objectid = objectid; 5625d4f98a2SYan Zheng key.offset = 0; 563962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 5640b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 56549a3c4d9SDavid Sterba root_item); 56667addf29SFilipe Manana if (ret) { 56767addf29SFilipe Manana /* 56867addf29SFilipe Manana * Since we don't abort the transaction in this case, free the 56967addf29SFilipe Manana * tree block so that we don't leak space and leave the 57067addf29SFilipe Manana * filesystem in an inconsistent state (an extent item in the 57167addf29SFilipe Manana * extent tree without backreferences). Also no need to have 57267addf29SFilipe Manana * the tree block locked since it is not in any tree at this 57367addf29SFilipe Manana * point, so no other task can find it and use it. 57467addf29SFilipe Manana */ 57567addf29SFilipe Manana btrfs_free_tree_block(trans, root, leaf, 0, 1); 57667addf29SFilipe Manana free_extent_buffer(leaf); 577f46b5a66SChristoph Hellwig goto fail; 57867addf29SFilipe Manana } 57967addf29SFilipe Manana 58067addf29SFilipe Manana free_extent_buffer(leaf); 58167addf29SFilipe Manana leaf = NULL; 582f46b5a66SChristoph Hellwig 58376dda93cSYan, Zheng key.offset = (u64)-1; 5842dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 58579787eaaSJeff Mahoney if (IS_ERR(new_root)) { 5862dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 58779787eaaSJeff Mahoney ret = PTR_ERR(new_root); 58866642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 58979787eaaSJeff Mahoney goto fail; 59079787eaaSJeff Mahoney } 5912dfb1e43SQu Wenruo /* Freeing will be done in btrfs_put_root() of new_root */ 5922dfb1e43SQu Wenruo anon_dev = 0; 59376dda93cSYan, Zheng 594221581e4SJosef Bacik ret = btrfs_record_root_in_trans(trans, new_root); 595221581e4SJosef Bacik if (ret) { 596221581e4SJosef Bacik btrfs_put_root(new_root); 597221581e4SJosef Bacik btrfs_abort_transaction(trans, ret); 598221581e4SJosef Bacik goto fail; 599221581e4SJosef Bacik } 60076dda93cSYan, Zheng 60169948022SNikolay Borisov ret = btrfs_create_subvol_root(trans, new_root, root); 60200246528SJosef Bacik btrfs_put_root(new_root); 603ce598979SMark Fasheh if (ret) { 604ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 60566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 606ce598979SMark Fasheh goto fail; 607ce598979SMark Fasheh } 608ce598979SMark Fasheh 609f46b5a66SChristoph Hellwig /* 610f46b5a66SChristoph Hellwig * insert the directory item 611f46b5a66SChristoph Hellwig */ 612877574e2SNikolay Borisov ret = btrfs_set_inode_index(BTRFS_I(dir), &index); 61379787eaaSJeff Mahoney if (ret) { 61466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 61579787eaaSJeff Mahoney goto fail; 61679787eaaSJeff Mahoney } 6173de4586cSChris Mason 618684572dfSLu Fengqi ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key, 6193de4586cSChris Mason BTRFS_FT_DIR, index); 62079787eaaSJeff Mahoney if (ret) { 62166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 622f46b5a66SChristoph Hellwig goto fail; 62379787eaaSJeff Mahoney } 6240660b5afSChris Mason 6256ef06d27SNikolay Borisov btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); 6269a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(dir)); 627c7e54b51SJosef Bacik if (ret) { 628c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 629c7e54b51SJosef Bacik goto fail; 630c7e54b51SJosef Bacik } 63152c26179SYan Zheng 6326025c19fSLu Fengqi ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid, 6334a0cc7caSNikolay Borisov btrfs_ino(BTRFS_I(dir)), index, name, namelen); 634c7e54b51SJosef Bacik if (ret) { 635c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 636c7e54b51SJosef Bacik goto fail; 637c7e54b51SJosef Bacik } 6380660b5afSChris Mason 639cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 6406bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 641dd5f9615SStefan Behrens if (ret) 64266642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 643dd5f9615SStefan Behrens 644f46b5a66SChristoph Hellwig fail: 64549a3c4d9SDavid Sterba kfree(root_item); 646d5c12070SMiao Xie trans->block_rsv = NULL; 647d5c12070SMiao Xie trans->bytes_reserved = 0; 648e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 649de6e8200SLiu Bo 6503a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 651f46b5a66SChristoph Hellwig if (err && !ret) 652f46b5a66SChristoph Hellwig ret = err; 6531a65e24bSChris Mason 6545662344bSTsutomu Itoh if (!ret) { 6555662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 656de6e8200SLiu Bo if (IS_ERR(inode)) 657de6e8200SLiu Bo return PTR_ERR(inode); 6585662344bSTsutomu Itoh d_instantiate(dentry, inode); 6595662344bSTsutomu Itoh } 660f46b5a66SChristoph Hellwig return ret; 66149a3c4d9SDavid Sterba 66249a3c4d9SDavid Sterba fail_free: 6632dfb1e43SQu Wenruo if (anon_dev) 6642dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 66549a3c4d9SDavid Sterba kfree(root_item); 66649a3c4d9SDavid Sterba return ret; 667f46b5a66SChristoph Hellwig } 668f46b5a66SChristoph Hellwig 669e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 6709babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 671e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 672f46b5a66SChristoph Hellwig { 6730b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 6742e4bfab9SYan, Zheng struct inode *inode; 675f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 676f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 6772e4bfab9SYan, Zheng int ret; 678f46b5a66SChristoph Hellwig 67992a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 680f46b5a66SChristoph Hellwig return -EINVAL; 681f46b5a66SChristoph Hellwig 682eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 683eede2bf3SOmar Sandoval btrfs_warn(fs_info, 684eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 685eede2bf3SOmar Sandoval return -ETXTBSY; 686eede2bf3SOmar Sandoval } 687eede2bf3SOmar Sandoval 68823269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 689a1ee7362SDavid Sterba if (!pending_snapshot) 690a1ee7362SDavid Sterba return -ENOMEM; 691a1ee7362SDavid Sterba 6922dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 6932dfb1e43SQu Wenruo if (ret < 0) 6942dfb1e43SQu Wenruo goto free_pending; 695b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 69623269bf5SDavid Sterba GFP_KERNEL); 6978546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 6988546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 699b0c0ea63SDavid Sterba ret = -ENOMEM; 700b0c0ea63SDavid Sterba goto free_pending; 701b0c0ea63SDavid Sterba } 702b0c0ea63SDavid Sterba 70366d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 70466d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 705d5c12070SMiao Xie /* 706d5c12070SMiao Xie * 1 - parent dir inode 707d5c12070SMiao Xie * 2 - dir entries 708d5c12070SMiao Xie * 1 - root item 709d5c12070SMiao Xie * 2 - root ref/backref 710d5c12070SMiao Xie * 1 - root of snapshot 711dd5f9615SStefan Behrens * 1 - UUID item 712d5c12070SMiao Xie */ 713d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 714dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 715ee3441b4SJeff Mahoney false); 716d5c12070SMiao Xie if (ret) 717c11fbb6eSRobbie Ko goto free_pending; 718d5c12070SMiao Xie 719a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 720a22285a6SYan, Zheng pending_snapshot->root = root; 721b83cc969SLi Zefan pending_snapshot->readonly = readonly; 722e9662f70SMiao Xie pending_snapshot->dir = dir; 7238696c533SMiao Xie pending_snapshot->inherit = inherit; 724a22285a6SYan, Zheng 725d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 726a22285a6SYan, Zheng if (IS_ERR(trans)) { 727a22285a6SYan, Zheng ret = PTR_ERR(trans); 728a22285a6SYan, Zheng goto fail; 729a22285a6SYan, Zheng } 730a22285a6SYan, Zheng 7310b246afaSJeff Mahoney spin_lock(&fs_info->trans_lock); 732a22285a6SYan, Zheng list_add(&pending_snapshot->list, 733a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 7340b246afaSJeff Mahoney spin_unlock(&fs_info->trans_lock); 7359babda9fSNikolay Borisov 7363a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 737aec8030aSMiao Xie if (ret) 738c37b2b62SJosef Bacik goto fail; 739a22285a6SYan, Zheng 740a22285a6SYan, Zheng ret = pending_snapshot->error; 741f46b5a66SChristoph Hellwig if (ret) 7422e4bfab9SYan, Zheng goto fail; 743f46b5a66SChristoph Hellwig 744d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 745d3797308SChris Mason if (ret) 746d3797308SChris Mason goto fail; 747d3797308SChris Mason 7482b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 7492e4bfab9SYan, Zheng if (IS_ERR(inode)) { 7502e4bfab9SYan, Zheng ret = PTR_ERR(inode); 7512e4bfab9SYan, Zheng goto fail; 7522e4bfab9SYan, Zheng } 7535662344bSTsutomu Itoh 7542e4bfab9SYan, Zheng d_instantiate(dentry, inode); 7552e4bfab9SYan, Zheng ret = 0; 7562dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 7572e4bfab9SYan, Zheng fail: 7582dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 7592dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 7602dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 76100246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 762e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 763b0c0ea63SDavid Sterba free_pending: 7642dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 7652dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 766b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 7678546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 768a1ee7362SDavid Sterba kfree(pending_snapshot); 769a1ee7362SDavid Sterba 770f46b5a66SChristoph Hellwig return ret; 771f46b5a66SChristoph Hellwig } 772f46b5a66SChristoph Hellwig 7734260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 7744260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 7754260f7c7SSage Weil * whether the type of victim is right. 7764260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 7774260f7c7SSage Weil * 2. We should have write and exec permissions on dir 7784260f7c7SSage Weil * 3. We can't remove anything from append-only dir 7794260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 7804260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 7814260f7c7SSage Weil * a. be owner of dir, or 7824260f7c7SSage Weil * b. be owner of victim, or 7834260f7c7SSage Weil * c. have CAP_FOWNER capability 78401327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 7854260f7c7SSage Weil * links pointing to it. 7864260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 7874260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 7884260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 7894260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 7904260f7c7SSage Weil * nfs_async_unlink(). 7914260f7c7SSage Weil */ 7924260f7c7SSage Weil 7934260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 7944260f7c7SSage Weil { 7954260f7c7SSage Weil int error; 7964260f7c7SSage Weil 7972b0143b5SDavid Howells if (d_really_is_negative(victim)) 7984260f7c7SSage Weil return -ENOENT; 7994260f7c7SSage Weil 8002b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 8014fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 8024260f7c7SSage Weil 80347291baaSChristian Brauner error = inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC); 8044260f7c7SSage Weil if (error) 8054260f7c7SSage Weil return error; 8064260f7c7SSage Weil if (IS_APPEND(dir)) 8074260f7c7SSage Weil return -EPERM; 808ba73d987SChristian Brauner if (check_sticky(&init_user_ns, dir, d_inode(victim)) || 809ba73d987SChristian Brauner IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) || 810ba73d987SChristian Brauner IS_SWAPFILE(d_inode(victim))) 8114260f7c7SSage Weil return -EPERM; 8124260f7c7SSage Weil if (isdir) { 813e36cb0b8SDavid Howells if (!d_is_dir(victim)) 8144260f7c7SSage Weil return -ENOTDIR; 8154260f7c7SSage Weil if (IS_ROOT(victim)) 8164260f7c7SSage Weil return -EBUSY; 817e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 8184260f7c7SSage Weil return -EISDIR; 8194260f7c7SSage Weil if (IS_DEADDIR(dir)) 8204260f7c7SSage Weil return -ENOENT; 8214260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 8224260f7c7SSage Weil return -EBUSY; 8234260f7c7SSage Weil return 0; 8244260f7c7SSage Weil } 8254260f7c7SSage Weil 826cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 827cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 828cb8e7090SChristoph Hellwig { 8292b0143b5SDavid Howells if (d_really_is_positive(child)) 830cb8e7090SChristoph Hellwig return -EEXIST; 831cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 832cb8e7090SChristoph Hellwig return -ENOENT; 83347291baaSChristian Brauner return inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC); 834cb8e7090SChristoph Hellwig } 835cb8e7090SChristoph Hellwig 836cb8e7090SChristoph Hellwig /* 837cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 838cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 839cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 840cb8e7090SChristoph Hellwig */ 84192872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 84252f75f4fSDavid Sterba const char *name, int namelen, 84372fd032eSSage Weil struct btrfs_root *snap_src, 8449babda9fSNikolay Borisov bool readonly, 8458696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 846cb8e7090SChristoph Hellwig { 8472b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 8480b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 849cb8e7090SChristoph Hellwig struct dentry *dentry; 850cb8e7090SChristoph Hellwig int error; 851cb8e7090SChristoph Hellwig 85200235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 85300235411SAl Viro if (error == -EINTR) 85400235411SAl Viro return error; 855cb8e7090SChristoph Hellwig 856cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 857cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 858cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 859cb8e7090SChristoph Hellwig goto out_unlock; 860cb8e7090SChristoph Hellwig 86176dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 862cb8e7090SChristoph Hellwig if (error) 863a874a63eSLiu Bo goto out_dput; 864cb8e7090SChristoph Hellwig 8659c52057cSChris Mason /* 8669c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 8679c52057cSChris Mason * check for them now when we can safely fail 8689c52057cSChris Mason */ 8699c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 8709c52057cSChris Mason dir->i_ino, name, 8719c52057cSChris Mason namelen); 8729c52057cSChris Mason if (error) 8739c52057cSChris Mason goto out_dput; 8749c52057cSChris Mason 8750b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 87676dda93cSYan, Zheng 87776dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 87876dda93cSYan, Zheng goto out_up_read; 87976dda93cSYan, Zheng 8809babda9fSNikolay Borisov if (snap_src) 8819babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 8829babda9fSNikolay Borisov else 8839babda9fSNikolay Borisov error = create_subvol(dir, dentry, name, namelen, inherit); 8849babda9fSNikolay Borisov 88576dda93cSYan, Zheng if (!error) 88676dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 88776dda93cSYan, Zheng out_up_read: 8880b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 889cb8e7090SChristoph Hellwig out_dput: 890cb8e7090SChristoph Hellwig dput(dentry); 891cb8e7090SChristoph Hellwig out_unlock: 89264708539SJosef Bacik btrfs_inode_unlock(dir, 0); 893cb8e7090SChristoph Hellwig return error; 894cb8e7090SChristoph Hellwig } 895cb8e7090SChristoph Hellwig 896c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 897c11fbb6eSRobbie Ko const char *name, int namelen, 898c11fbb6eSRobbie Ko struct btrfs_root *root, 899c11fbb6eSRobbie Ko bool readonly, 900c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 901c11fbb6eSRobbie Ko { 902c11fbb6eSRobbie Ko int ret; 903c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 904c11fbb6eSRobbie Ko 905c11fbb6eSRobbie Ko /* 906c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 907c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 908c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 909c11fbb6eSRobbie Ko */ 910c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 911c11fbb6eSRobbie Ko 912c11fbb6eSRobbie Ko ret = btrfs_start_delalloc_snapshot(root); 913c11fbb6eSRobbie Ko if (ret) 914c11fbb6eSRobbie Ko goto out; 915c11fbb6eSRobbie Ko 916c11fbb6eSRobbie Ko /* 917c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 918c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 919c11fbb6eSRobbie Ko * creation. 920c11fbb6eSRobbie Ko */ 921c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 922c11fbb6eSRobbie Ko snapshot_force_cow = true; 923c11fbb6eSRobbie Ko 924c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 925c11fbb6eSRobbie Ko 926c11fbb6eSRobbie Ko ret = btrfs_mksubvol(parent, name, namelen, 927c11fbb6eSRobbie Ko root, readonly, inherit); 928c11fbb6eSRobbie Ko out: 929c11fbb6eSRobbie Ko if (snapshot_force_cow) 930c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 931c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 932c11fbb6eSRobbie Ko return ret; 933c11fbb6eSRobbie Ko } 934c11fbb6eSRobbie Ko 9354cb5300bSChris Mason /* 9364cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 9374cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 9384cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 9394cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 9404cb5300bSChris Mason * part of the file 9414cb5300bSChris Mason */ 942aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 9434cb5300bSChris Mason { 9444cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 9454cb5300bSChris Mason struct extent_map *em = NULL; 9464cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 9474cb5300bSChris Mason u64 end; 9484cb5300bSChris Mason 9494cb5300bSChris Mason read_lock(&em_tree->lock); 95009cbfeafSKirill A. Shutemov em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE); 9514cb5300bSChris Mason read_unlock(&em_tree->lock); 9524cb5300bSChris Mason 9534cb5300bSChris Mason if (em) { 9544cb5300bSChris Mason end = extent_map_end(em); 9554cb5300bSChris Mason free_extent_map(em); 9564cb5300bSChris Mason if (end - offset > thresh) 9574cb5300bSChris Mason return 0; 9584cb5300bSChris Mason } 9594cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 9604cb5300bSChris Mason thresh /= 2; 9614cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 9624cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 9634cb5300bSChris Mason if (end >= thresh) 9644cb5300bSChris Mason return 0; 9654cb5300bSChris Mason return 1; 9664cb5300bSChris Mason } 9674cb5300bSChris Mason 9684cb5300bSChris Mason /* 9694cb5300bSChris Mason * helper function to walk through a file and find extents 9704cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 9714cb5300bSChris Mason * 9724cb5300bSChris Mason * This is used by the defragging code to find new and small 9734cb5300bSChris Mason * extents 9744cb5300bSChris Mason */ 9754cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 9764cb5300bSChris Mason struct inode *inode, u64 newer_than, 977aab110abSDavid Sterba u64 *off, u32 thresh) 9784cb5300bSChris Mason { 9794cb5300bSChris Mason struct btrfs_path *path; 9804cb5300bSChris Mason struct btrfs_key min_key; 9814cb5300bSChris Mason struct extent_buffer *leaf; 9824cb5300bSChris Mason struct btrfs_file_extent_item *extent; 9834cb5300bSChris Mason int type; 9844cb5300bSChris Mason int ret; 9854a0cc7caSNikolay Borisov u64 ino = btrfs_ino(BTRFS_I(inode)); 9864cb5300bSChris Mason 9874cb5300bSChris Mason path = btrfs_alloc_path(); 9884cb5300bSChris Mason if (!path) 9894cb5300bSChris Mason return -ENOMEM; 9904cb5300bSChris Mason 991a4689d2bSDavid Sterba min_key.objectid = ino; 9924cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 9934cb5300bSChris Mason min_key.offset = *off; 9944cb5300bSChris Mason 9954cb5300bSChris Mason while (1) { 9966174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 9974cb5300bSChris Mason if (ret != 0) 9984cb5300bSChris Mason goto none; 999f094c9bdSFilipe Manana process_slot: 1000a4689d2bSDavid Sterba if (min_key.objectid != ino) 10014cb5300bSChris Mason goto none; 10024cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 10034cb5300bSChris Mason goto none; 10044cb5300bSChris Mason 10054cb5300bSChris Mason leaf = path->nodes[0]; 10064cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 10074cb5300bSChris Mason struct btrfs_file_extent_item); 10084cb5300bSChris Mason 10094cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 10104cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 10114cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 10124cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 10134cb5300bSChris Mason *off = min_key.offset; 10144cb5300bSChris Mason btrfs_free_path(path); 10154cb5300bSChris Mason return 0; 10164cb5300bSChris Mason } 10174cb5300bSChris Mason 1018f094c9bdSFilipe Manana path->slots[0]++; 1019f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 1020f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 1021f094c9bdSFilipe Manana goto process_slot; 1022f094c9bdSFilipe Manana } 1023f094c9bdSFilipe Manana 10244cb5300bSChris Mason if (min_key.offset == (u64)-1) 10254cb5300bSChris Mason goto none; 10264cb5300bSChris Mason 10274cb5300bSChris Mason min_key.offset++; 10284cb5300bSChris Mason btrfs_release_path(path); 10294cb5300bSChris Mason } 10304cb5300bSChris Mason none: 10314cb5300bSChris Mason btrfs_free_path(path); 10324cb5300bSChris Mason return -ENOENT; 10334cb5300bSChris Mason } 10344cb5300bSChris Mason 10356c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 103617ce6ef8SLiu Bo { 103717ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1038940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 10396c282eb4SLi Zefan struct extent_map *em; 104009cbfeafSKirill A. Shutemov u64 len = PAGE_SIZE; 1041940100a4SChris Mason 1042940100a4SChris Mason /* 1043940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1044940100a4SChris Mason * the full extent lock 1045940100a4SChris Mason */ 1046940100a4SChris Mason read_lock(&em_tree->lock); 1047940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 1048940100a4SChris Mason read_unlock(&em_tree->lock); 1049940100a4SChris Mason 1050940100a4SChris Mason if (!em) { 1051308d9800SFilipe Manana struct extent_state *cached = NULL; 1052308d9800SFilipe Manana u64 end = start + len - 1; 1053308d9800SFilipe Manana 1054940100a4SChris Mason /* get the big lock and read metadata off disk */ 1055ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 105639b07b5dSOmar Sandoval em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len); 1057e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1058940100a4SChris Mason 10596cf8bfbfSDan Carpenter if (IS_ERR(em)) 10606c282eb4SLi Zefan return NULL; 1061940100a4SChris Mason } 1062940100a4SChris Mason 10636c282eb4SLi Zefan return em; 10646c282eb4SLi Zefan } 10656c282eb4SLi Zefan 10666c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 10676c282eb4SLi Zefan { 10686c282eb4SLi Zefan struct extent_map *next; 10696c282eb4SLi Zefan bool ret = true; 10706c282eb4SLi Zefan 10716c282eb4SLi Zefan /* this is the last extent */ 10726c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 10736c282eb4SLi Zefan return false; 10746c282eb4SLi Zefan 10756c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1076e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1077e9512d72SChris Mason ret = false; 1078e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1079ee22184bSByongho Lee (em->block_len > SZ_128K && next->block_len > SZ_128K)) 10806c282eb4SLi Zefan ret = false; 10816c282eb4SLi Zefan 10826c282eb4SLi Zefan free_extent_map(next); 10836c282eb4SLi Zefan return ret; 10846c282eb4SLi Zefan } 10856c282eb4SLi Zefan 1086aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1087a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1088a43a2111SAndrew Mahone int compress) 10896c282eb4SLi Zefan { 10906c282eb4SLi Zefan struct extent_map *em; 10916c282eb4SLi Zefan int ret = 1; 10926c282eb4SLi Zefan bool next_mergeable = true; 10934a3560c4SLiu Bo bool prev_mergeable = true; 10946c282eb4SLi Zefan 10956c282eb4SLi Zefan /* 10966c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 10976c282eb4SLi Zefan * defragging it 10986c282eb4SLi Zefan */ 10996c282eb4SLi Zefan if (start < *defrag_end) 11006c282eb4SLi Zefan return 1; 11016c282eb4SLi Zefan 11026c282eb4SLi Zefan *skip = 0; 11036c282eb4SLi Zefan 11046c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 11056c282eb4SLi Zefan if (!em) 11066c282eb4SLi Zefan return 0; 11076c282eb4SLi Zefan 1108940100a4SChris Mason /* this will cover holes, and inline extents */ 110917ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1110940100a4SChris Mason ret = 0; 111117ce6ef8SLiu Bo goto out; 111217ce6ef8SLiu Bo } 111317ce6ef8SLiu Bo 11144a3560c4SLiu Bo if (!*defrag_end) 11154a3560c4SLiu Bo prev_mergeable = false; 11164a3560c4SLiu Bo 11176c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1118940100a4SChris Mason /* 11196c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 11206c282eb4SLi Zefan * real extent, don't bother defragging it 1121940100a4SChris Mason */ 1122a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 11234a3560c4SLiu Bo (em->len >= thresh || (!next_mergeable && !prev_mergeable))) 1124940100a4SChris Mason ret = 0; 112517ce6ef8SLiu Bo out: 1126940100a4SChris Mason /* 1127940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1128940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1129940100a4SChris Mason * so that the next tiny extent will force a defrag. 1130940100a4SChris Mason * 1131940100a4SChris Mason * The end result of this is that tiny extents before a single big 1132940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1133940100a4SChris Mason */ 1134940100a4SChris Mason if (ret) { 1135940100a4SChris Mason *defrag_end = extent_map_end(em); 1136940100a4SChris Mason } else { 1137940100a4SChris Mason *last_len = 0; 1138940100a4SChris Mason *skip = extent_map_end(em); 1139940100a4SChris Mason *defrag_end = 0; 1140940100a4SChris Mason } 1141940100a4SChris Mason 1142940100a4SChris Mason free_extent_map(em); 1143940100a4SChris Mason return ret; 1144940100a4SChris Mason } 1145940100a4SChris Mason 11464cb5300bSChris Mason /* 11474cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 11484cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 11494cb5300bSChris Mason * to COW and defrag. 11504cb5300bSChris Mason * 11514cb5300bSChris Mason * It also makes sure the delalloc code has enough 11524cb5300bSChris Mason * dirty data to avoid making new small extents as part 11534cb5300bSChris Mason * of the defrag 11544cb5300bSChris Mason * 11554cb5300bSChris Mason * It's a good idea to start RA on this range 11564cb5300bSChris Mason * before calling this. 11574cb5300bSChris Mason */ 11584cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 11594cb5300bSChris Mason struct page **pages, 11604cb5300bSChris Mason unsigned long start_index, 1161c41570c9SJustin Maggard unsigned long num_pages) 1162f46b5a66SChristoph Hellwig { 11634cb5300bSChris Mason unsigned long file_end; 11644cb5300bSChris Mason u64 isize = i_size_read(inode); 1165f46b5a66SChristoph Hellwig u64 page_start; 1166f46b5a66SChristoph Hellwig u64 page_end; 11671f12bd06SLiu Bo u64 page_cnt; 1168a1fbc675SMatthew Wilcox (Oracle) u64 start = (u64)start_index << PAGE_SHIFT; 11697f458a38SFilipe Manana u64 search_start; 11704cb5300bSChris Mason int ret; 11714cb5300bSChris Mason int i; 11724cb5300bSChris Mason int i_done; 11734cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 11744cb5300bSChris Mason struct extent_state *cached_state = NULL; 1175600a45e1SMiao Xie struct extent_io_tree *tree; 1176364ecf36SQu Wenruo struct extent_changeset *data_reserved = NULL; 11773b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 11784cb5300bSChris Mason 117909cbfeafSKirill A. Shutemov file_end = (isize - 1) >> PAGE_SHIFT; 11801f12bd06SLiu Bo if (!isize || start_index > file_end) 11811f12bd06SLiu Bo return 0; 11821f12bd06SLiu Bo 11831f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 11844cb5300bSChris Mason 1185e5b7231eSNikolay Borisov ret = btrfs_delalloc_reserve_space(BTRFS_I(inode), &data_reserved, 1186a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT); 11874cb5300bSChris Mason if (ret) 11884cb5300bSChris Mason return ret; 11894cb5300bSChris Mason i_done = 0; 1190600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 11914cb5300bSChris Mason 11924cb5300bSChris Mason /* step one, lock all the pages */ 11931f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 11944cb5300bSChris Mason struct page *page; 1195600a45e1SMiao Xie again: 1196a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 11973b16a4e3SJosef Bacik start_index + i, mask); 11984cb5300bSChris Mason if (!page) 11994cb5300bSChris Mason break; 12004cb5300bSChris Mason 120132443de3SQu Wenruo ret = set_page_extent_mapped(page); 120232443de3SQu Wenruo if (ret < 0) { 120332443de3SQu Wenruo unlock_page(page); 120432443de3SQu Wenruo put_page(page); 120532443de3SQu Wenruo break; 120632443de3SQu Wenruo } 120732443de3SQu Wenruo 1208600a45e1SMiao Xie page_start = page_offset(page); 120909cbfeafSKirill A. Shutemov page_end = page_start + PAGE_SIZE - 1; 1210600a45e1SMiao Xie while (1) { 1211308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1212ff13db41SDavid Sterba &cached_state); 1213c3504372SNikolay Borisov ordered = btrfs_lookup_ordered_extent(BTRFS_I(inode), 1214600a45e1SMiao Xie page_start); 1215308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1216e43bbe5eSDavid Sterba &cached_state); 1217600a45e1SMiao Xie if (!ordered) 1218600a45e1SMiao Xie break; 1219600a45e1SMiao Xie 1220600a45e1SMiao Xie unlock_page(page); 1221c0a43603SNikolay Borisov btrfs_start_ordered_extent(ordered, 1); 1222600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1223600a45e1SMiao Xie lock_page(page); 12241f12bd06SLiu Bo /* 12251f12bd06SLiu Bo * we unlocked the page above, so we need check if 12261f12bd06SLiu Bo * it was released or not. 12271f12bd06SLiu Bo */ 12281f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 12291f12bd06SLiu Bo unlock_page(page); 123009cbfeafSKirill A. Shutemov put_page(page); 12311f12bd06SLiu Bo goto again; 12321f12bd06SLiu Bo } 1233600a45e1SMiao Xie } 1234600a45e1SMiao Xie 12354cb5300bSChris Mason if (!PageUptodate(page)) { 12364cb5300bSChris Mason btrfs_readpage(NULL, page); 12374cb5300bSChris Mason lock_page(page); 12384cb5300bSChris Mason if (!PageUptodate(page)) { 12394cb5300bSChris Mason unlock_page(page); 124009cbfeafSKirill A. Shutemov put_page(page); 12414cb5300bSChris Mason ret = -EIO; 12424cb5300bSChris Mason break; 12434cb5300bSChris Mason } 12444cb5300bSChris Mason } 1245600a45e1SMiao Xie 1246600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1247600a45e1SMiao Xie unlock_page(page); 124809cbfeafSKirill A. Shutemov put_page(page); 1249600a45e1SMiao Xie goto again; 1250600a45e1SMiao Xie } 1251600a45e1SMiao Xie 12524cb5300bSChris Mason pages[i] = page; 12534cb5300bSChris Mason i_done++; 12544cb5300bSChris Mason } 12554cb5300bSChris Mason if (!i_done || ret) 12564cb5300bSChris Mason goto out; 12574cb5300bSChris Mason 12581751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 12594cb5300bSChris Mason goto out; 12604cb5300bSChris Mason 12614cb5300bSChris Mason /* 12624cb5300bSChris Mason * so now we have a nice long stream of locked 12634cb5300bSChris Mason * and up to date pages, lets wait on them 12644cb5300bSChris Mason */ 12654cb5300bSChris Mason for (i = 0; i < i_done; i++) 12664cb5300bSChris Mason wait_on_page_writeback(pages[i]); 12674cb5300bSChris Mason 12684cb5300bSChris Mason page_start = page_offset(pages[0]); 126909cbfeafSKirill A. Shutemov page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE; 12704cb5300bSChris Mason 12714cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1272ff13db41SDavid Sterba page_start, page_end - 1, &cached_state); 12737f458a38SFilipe Manana 12747f458a38SFilipe Manana /* 12757f458a38SFilipe Manana * When defragmenting we skip ranges that have holes or inline extents, 12767f458a38SFilipe Manana * (check should_defrag_range()), to avoid unnecessary IO and wasting 12777f458a38SFilipe Manana * space. At btrfs_defrag_file(), we check if a range should be defragged 12787f458a38SFilipe Manana * before locking the inode and then, if it should, we trigger a sync 12797f458a38SFilipe Manana * page cache readahead - we lock the inode only after that to avoid 12807f458a38SFilipe Manana * blocking for too long other tasks that possibly want to operate on 12817f458a38SFilipe Manana * other file ranges. But before we were able to get the inode lock, 12827f458a38SFilipe Manana * some other task may have punched a hole in the range, or we may have 12837f458a38SFilipe Manana * now an inline extent, in which case we should not defrag. So check 12847f458a38SFilipe Manana * for that here, where we have the inode and the range locked, and bail 12857f458a38SFilipe Manana * out if that happened. 12867f458a38SFilipe Manana */ 12877f458a38SFilipe Manana search_start = page_start; 12887f458a38SFilipe Manana while (search_start < page_end) { 12897f458a38SFilipe Manana struct extent_map *em; 12907f458a38SFilipe Manana 12917f458a38SFilipe Manana em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, search_start, 12927f458a38SFilipe Manana page_end - search_start); 12937f458a38SFilipe Manana if (IS_ERR(em)) { 12947f458a38SFilipe Manana ret = PTR_ERR(em); 12957f458a38SFilipe Manana goto out_unlock_range; 12967f458a38SFilipe Manana } 12977f458a38SFilipe Manana if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 12987f458a38SFilipe Manana free_extent_map(em); 12997f458a38SFilipe Manana /* Ok, 0 means we did not defrag anything */ 13007f458a38SFilipe Manana ret = 0; 13017f458a38SFilipe Manana goto out_unlock_range; 13027f458a38SFilipe Manana } 13037f458a38SFilipe Manana search_start = extent_map_end(em); 13047f458a38SFilipe Manana free_extent_map(em); 13057f458a38SFilipe Manana } 13067f458a38SFilipe Manana 13074cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 1308e182163dSOmar Sandoval page_end - 1, EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 1309e182163dSOmar Sandoval EXTENT_DEFRAG, 0, 0, &cached_state); 13104cb5300bSChris Mason 13111f12bd06SLiu Bo if (i_done != page_cnt) { 13129e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 131328c4a3e2SSu Yue btrfs_mod_outstanding_extents(BTRFS_I(inode), 1); 13149e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 131586d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1316a1fbc675SMatthew Wilcox (Oracle) start, (page_cnt - i_done) << PAGE_SHIFT, true); 13174cb5300bSChris Mason } 13184cb5300bSChris Mason 13194cb5300bSChris Mason 13209e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 1321018ed4f7SDavid Sterba &cached_state); 13224cb5300bSChris Mason 13234cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 1324e43bbe5eSDavid Sterba page_start, page_end - 1, &cached_state); 13254cb5300bSChris Mason 13264cb5300bSChris Mason for (i = 0; i < i_done; i++) { 13274cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 13284cb5300bSChris Mason ClearPageChecked(pages[i]); 13294cb5300bSChris Mason set_page_dirty(pages[i]); 13304cb5300bSChris Mason unlock_page(pages[i]); 133109cbfeafSKirill A. Shutemov put_page(pages[i]); 13324cb5300bSChris Mason } 13338702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1334364ecf36SQu Wenruo extent_changeset_free(data_reserved); 13354cb5300bSChris Mason return i_done; 13367f458a38SFilipe Manana 13377f458a38SFilipe Manana out_unlock_range: 13387f458a38SFilipe Manana unlock_extent_cached(&BTRFS_I(inode)->io_tree, 13397f458a38SFilipe Manana page_start, page_end - 1, &cached_state); 13404cb5300bSChris Mason out: 13414cb5300bSChris Mason for (i = 0; i < i_done; i++) { 13424cb5300bSChris Mason unlock_page(pages[i]); 134309cbfeafSKirill A. Shutemov put_page(pages[i]); 13444cb5300bSChris Mason } 134586d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1346a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT, true); 13478702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1348364ecf36SQu Wenruo extent_changeset_free(data_reserved); 13494cb5300bSChris Mason return ret; 13504cb5300bSChris Mason 13514cb5300bSChris Mason } 13524cb5300bSChris Mason 13534cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 13544cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 13554cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 13564cb5300bSChris Mason { 13570b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 13584cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 13594cb5300bSChris Mason struct file_ra_state *ra = NULL; 13604cb5300bSChris Mason unsigned long last_index; 1361151a31b2SLi Zefan u64 isize = i_size_read(inode); 1362940100a4SChris Mason u64 last_len = 0; 1363940100a4SChris Mason u64 skip = 0; 1364940100a4SChris Mason u64 defrag_end = 0; 13654cb5300bSChris Mason u64 newer_off = range->start; 1366f46b5a66SChristoph Hellwig unsigned long i; 1367008873eaSLi Zefan unsigned long ra_index = 0; 1368f46b5a66SChristoph Hellwig int ret; 13694cb5300bSChris Mason int defrag_count = 0; 13701a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1371aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 137209cbfeafSKirill A. Shutemov unsigned long max_cluster = SZ_256K >> PAGE_SHIFT; 1373c41570c9SJustin Maggard unsigned long cluster = max_cluster; 1374ee22184bSByongho Lee u64 new_align = ~((u64)SZ_128K - 1); 13754cb5300bSChris Mason struct page **pages = NULL; 13761e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 13774cb5300bSChris Mason 13780abd5b17SLiu Bo if (isize == 0) 13790abd5b17SLiu Bo return 0; 13800abd5b17SLiu Bo 13810abd5b17SLiu Bo if (range->start >= isize) 13820abd5b17SLiu Bo return -EINVAL; 13831a419d85SLi Zefan 13841e2ef46dSDavid Sterba if (do_compress) { 1385ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 13861a419d85SLi Zefan return -EINVAL; 13871a419d85SLi Zefan if (range->compress_type) 13881a419d85SLi Zefan compress_type = range->compress_type; 13891a419d85SLi Zefan } 1390f46b5a66SChristoph Hellwig 13910abd5b17SLiu Bo if (extent_thresh == 0) 1392ee22184bSByongho Lee extent_thresh = SZ_256K; 1393f46b5a66SChristoph Hellwig 13944cb5300bSChris Mason /* 13950a52d108SDavid Sterba * If we were not given a file, allocate a readahead context. As 13960a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 13970a52d108SDavid Sterba * we don't error out. 13984cb5300bSChris Mason */ 13994cb5300bSChris Mason if (!file) { 140063e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 14010a52d108SDavid Sterba if (ra) 14024cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 14034cb5300bSChris Mason } else { 14044cb5300bSChris Mason ra = &file->f_ra; 14054cb5300bSChris Mason } 14064cb5300bSChris Mason 140763e727ecSDavid Sterba pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL); 14084cb5300bSChris Mason if (!pages) { 14094cb5300bSChris Mason ret = -ENOMEM; 14104cb5300bSChris Mason goto out_ra; 14114cb5300bSChris Mason } 14124cb5300bSChris Mason 14134cb5300bSChris Mason /* find the last page to defrag */ 14141e701a32SChris Mason if (range->start + range->len > range->start) { 1415151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 141609cbfeafSKirill A. Shutemov range->start + range->len - 1) >> PAGE_SHIFT; 14171e701a32SChris Mason } else { 141809cbfeafSKirill A. Shutemov last_index = (isize - 1) >> PAGE_SHIFT; 14191e701a32SChris Mason } 14201e701a32SChris Mason 14214cb5300bSChris Mason if (newer_than) { 14224cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 1423ee22184bSByongho Lee &newer_off, SZ_64K); 14244cb5300bSChris Mason if (!ret) { 14254cb5300bSChris Mason range->start = newer_off; 14264cb5300bSChris Mason /* 14274cb5300bSChris Mason * we always align our defrag to help keep 14284cb5300bSChris Mason * the extents in the file evenly spaced 14294cb5300bSChris Mason */ 143009cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 14314cb5300bSChris Mason } else 14324cb5300bSChris Mason goto out_ra; 14334cb5300bSChris Mason } else { 143409cbfeafSKirill A. Shutemov i = range->start >> PAGE_SHIFT; 14354cb5300bSChris Mason } 14364cb5300bSChris Mason if (!max_to_defrag) 1437070034bdSchandan max_to_defrag = last_index - i + 1; 14384cb5300bSChris Mason 14392a0f7f57SLi Zefan /* 14402a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 14412a0f7f57SLi Zefan * written sequentially. 14422a0f7f57SLi Zefan */ 14432a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 14442a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 14452a0f7f57SLi Zefan 1446f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 144709cbfeafSKirill A. Shutemov (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) { 14484cb5300bSChris Mason /* 14494cb5300bSChris Mason * make sure we stop running if someone unmounts 14504cb5300bSChris Mason * the FS 14514cb5300bSChris Mason */ 14521751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 14534cb5300bSChris Mason break; 14544cb5300bSChris Mason 14550b246afaSJeff Mahoney if (btrfs_defrag_cancelled(fs_info)) { 14560b246afaSJeff Mahoney btrfs_debug(fs_info, "defrag_file cancelled"); 1457210549ebSDavid Sterba ret = -EAGAIN; 1458210549ebSDavid Sterba break; 1459210549ebSDavid Sterba } 1460210549ebSDavid Sterba 146109cbfeafSKirill A. Shutemov if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT, 14626c282eb4SLi Zefan extent_thresh, &last_len, &skip, 14631e2ef46dSDavid Sterba &defrag_end, do_compress)){ 1464940100a4SChris Mason unsigned long next; 1465940100a4SChris Mason /* 1466940100a4SChris Mason * the should_defrag function tells us how much to skip 1467940100a4SChris Mason * bump our counter by the suggested amount 1468940100a4SChris Mason */ 146909cbfeafSKirill A. Shutemov next = DIV_ROUND_UP(skip, PAGE_SIZE); 1470940100a4SChris Mason i = max(i + 1, next); 1471940100a4SChris Mason continue; 1472940100a4SChris Mason } 1473008873eaSLi Zefan 1474008873eaSLi Zefan if (!newer_than) { 147509cbfeafSKirill A. Shutemov cluster = (PAGE_ALIGN(defrag_end) >> 147609cbfeafSKirill A. Shutemov PAGE_SHIFT) - i; 1477008873eaSLi Zefan cluster = min(cluster, max_cluster); 1478008873eaSLi Zefan } else { 1479008873eaSLi Zefan cluster = max_cluster; 1480008873eaSLi Zefan } 1481008873eaSLi Zefan 1482008873eaSLi Zefan if (i + cluster > ra_index) { 1483008873eaSLi Zefan ra_index = max(i, ra_index); 14840a52d108SDavid Sterba if (ra) 1485d3c0bab5SDavid Sterba page_cache_sync_readahead(inode->i_mapping, ra, 1486d3c0bab5SDavid Sterba file, ra_index, cluster); 1487e4826a5bSchandan ra_index += cluster; 1488008873eaSLi Zefan } 14894cb5300bSChris Mason 149064708539SJosef Bacik btrfs_inode_lock(inode, 0); 1491eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1492eede2bf3SOmar Sandoval ret = -ETXTBSY; 1493eede2bf3SOmar Sandoval } else { 14941e2ef46dSDavid Sterba if (do_compress) 1495eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 1496008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1497eede2bf3SOmar Sandoval } 1498ecb8bea8SLiu Bo if (ret < 0) { 149964708539SJosef Bacik btrfs_inode_unlock(inode, 0); 15004cb5300bSChris Mason goto out_ra; 1501ecb8bea8SLiu Bo } 15024cb5300bSChris Mason 15034cb5300bSChris Mason defrag_count += ret; 1504d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 150564708539SJosef Bacik btrfs_inode_unlock(inode, 0); 15064cb5300bSChris Mason 15074cb5300bSChris Mason if (newer_than) { 15084cb5300bSChris Mason if (newer_off == (u64)-1) 15094cb5300bSChris Mason break; 15104cb5300bSChris Mason 1511e1f041e1SLiu Bo if (ret > 0) 1512e1f041e1SLiu Bo i += ret; 1513e1f041e1SLiu Bo 15144cb5300bSChris Mason newer_off = max(newer_off + 1, 151509cbfeafSKirill A. Shutemov (u64)i << PAGE_SHIFT); 15164cb5300bSChris Mason 1517ee22184bSByongho Lee ret = find_new_extents(root, inode, newer_than, 1518ee22184bSByongho Lee &newer_off, SZ_64K); 15194cb5300bSChris Mason if (!ret) { 15204cb5300bSChris Mason range->start = newer_off; 152109cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 15224cb5300bSChris Mason } else { 15234cb5300bSChris Mason break; 1524940100a4SChris Mason } 15254cb5300bSChris Mason } else { 1526008873eaSLi Zefan if (ret > 0) { 1527cbcc8326SLi Zefan i += ret; 152809cbfeafSKirill A. Shutemov last_len += ret << PAGE_SHIFT; 1529008873eaSLi Zefan } else { 1530940100a4SChris Mason i++; 1531008873eaSLi Zefan last_len = 0; 1532008873eaSLi Zefan } 1533f46b5a66SChristoph Hellwig } 15344cb5300bSChris Mason } 1535f46b5a66SChristoph Hellwig 1536dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 15371e701a32SChris Mason filemap_flush(inode->i_mapping); 1538dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1539dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1540dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1541dec8ef90SFilipe Manana } 15421e701a32SChris Mason 15431a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 15440b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 15455c1aab1dSNick Terrell } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) { 15465c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 15471a419d85SLi Zefan } 15481a419d85SLi Zefan 154960ccf82fSDiego Calleja ret = defrag_count; 1550940100a4SChris Mason 15514cb5300bSChris Mason out_ra: 15521e2ef46dSDavid Sterba if (do_compress) { 155364708539SJosef Bacik btrfs_inode_lock(inode, 0); 1554eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 155564708539SJosef Bacik btrfs_inode_unlock(inode, 0); 1556633085c7SFilipe David Borba Manana } 15574cb5300bSChris Mason if (!file) 15584cb5300bSChris Mason kfree(ra); 15594cb5300bSChris Mason kfree(pages); 1560940100a4SChris Mason return ret; 1561f46b5a66SChristoph Hellwig } 1562f46b5a66SChristoph Hellwig 1563198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 156476dda93cSYan, Zheng void __user *arg) 1565f46b5a66SChristoph Hellwig { 15660b246afaSJeff Mahoney struct inode *inode = file_inode(file); 15670b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1568f46b5a66SChristoph Hellwig u64 new_size; 1569f46b5a66SChristoph Hellwig u64 old_size; 1570f46b5a66SChristoph Hellwig u64 devid = 1; 15710b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1572f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1573f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1574f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1575f46b5a66SChristoph Hellwig char *sizestr; 15769a40f122SGui Hecheng char *retptr; 1577f46b5a66SChristoph Hellwig char *devstr = NULL; 1578f46b5a66SChristoph Hellwig int ret = 0; 1579f46b5a66SChristoph Hellwig int mod = 0; 1580f46b5a66SChristoph Hellwig 1581e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1582e441d54dSChris Mason return -EPERM; 1583e441d54dSChris Mason 1584198605a8SMiao Xie ret = mnt_want_write_file(file); 1585198605a8SMiao Xie if (ret) 1586198605a8SMiao Xie return ret; 1587198605a8SMiao Xie 1588c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_RESIZE)) { 158997547676SMiao Xie mnt_drop_write_file(file); 1590e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1591c9e9f97bSIlya Dryomov } 1592c9e9f97bSIlya Dryomov 1593dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1594c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1595c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1596c9e9f97bSIlya Dryomov goto out; 1597c9e9f97bSIlya Dryomov } 15985516e595SMark Fasheh 15995516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1600f46b5a66SChristoph Hellwig 1601f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1602f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1603f46b5a66SChristoph Hellwig if (devstr) { 1604f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1605f46b5a66SChristoph Hellwig *devstr = '\0'; 1606f46b5a66SChristoph Hellwig devstr = vol_args->name; 160758dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 160858dfae63SZhangZhen if (ret) 160958dfae63SZhangZhen goto out_free; 1610dfd79829SMiao Xie if (!devid) { 1611dfd79829SMiao Xie ret = -EINVAL; 1612dfd79829SMiao Xie goto out_free; 1613dfd79829SMiao Xie } 16140b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1615f46b5a66SChristoph Hellwig } 1616dba60f3fSMiao Xie 1617b2598edfSAnand Jain device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL); 1618f46b5a66SChristoph Hellwig if (!device) { 16190b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1620c1c9ff7cSGeert Uytterhoeven devid); 1621dfd79829SMiao Xie ret = -ENODEV; 1622c9e9f97bSIlya Dryomov goto out_free; 1623f46b5a66SChristoph Hellwig } 1624dba60f3fSMiao Xie 1625ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 16260b246afaSJeff Mahoney btrfs_info(fs_info, 1627efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1628c1c9ff7cSGeert Uytterhoeven devid); 1629dfd79829SMiao Xie ret = -EPERM; 16304e42ae1bSLiu Bo goto out_free; 16314e42ae1bSLiu Bo } 16324e42ae1bSLiu Bo 1633f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1634f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1635f46b5a66SChristoph Hellwig else { 1636f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1637f46b5a66SChristoph Hellwig mod = -1; 1638f46b5a66SChristoph Hellwig sizestr++; 1639f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1640f46b5a66SChristoph Hellwig mod = 1; 1641f46b5a66SChristoph Hellwig sizestr++; 1642f46b5a66SChristoph Hellwig } 16439a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 16449a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1645f46b5a66SChristoph Hellwig ret = -EINVAL; 1646c9e9f97bSIlya Dryomov goto out_free; 1647f46b5a66SChristoph Hellwig } 1648f46b5a66SChristoph Hellwig } 1649f46b5a66SChristoph Hellwig 1650401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1651dfd79829SMiao Xie ret = -EPERM; 165263a212abSStefan Behrens goto out_free; 165363a212abSStefan Behrens } 165463a212abSStefan Behrens 16557cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1656f46b5a66SChristoph Hellwig 1657f46b5a66SChristoph Hellwig if (mod < 0) { 1658f46b5a66SChristoph Hellwig if (new_size > old_size) { 1659f46b5a66SChristoph Hellwig ret = -EINVAL; 1660c9e9f97bSIlya Dryomov goto out_free; 1661f46b5a66SChristoph Hellwig } 1662f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1663f46b5a66SChristoph Hellwig } else if (mod > 0) { 1664eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1665902c68a4SGui Hecheng ret = -ERANGE; 1666eb8052e0SWenliang Fan goto out_free; 1667eb8052e0SWenliang Fan } 1668f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1669f46b5a66SChristoph Hellwig } 1670f46b5a66SChristoph Hellwig 1671ee22184bSByongho Lee if (new_size < SZ_256M) { 1672f46b5a66SChristoph Hellwig ret = -EINVAL; 1673c9e9f97bSIlya Dryomov goto out_free; 1674f46b5a66SChristoph Hellwig } 1675f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1676f46b5a66SChristoph Hellwig ret = -EFBIG; 1677c9e9f97bSIlya Dryomov goto out_free; 1678f46b5a66SChristoph Hellwig } 1679f46b5a66SChristoph Hellwig 168047f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1681f46b5a66SChristoph Hellwig 1682f46b5a66SChristoph Hellwig if (new_size > old_size) { 1683a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 168498d5dc13STsutomu Itoh if (IS_ERR(trans)) { 168598d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1686c9e9f97bSIlya Dryomov goto out_free; 168798d5dc13STsutomu Itoh } 1688f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 16893a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1690ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1691f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 16920253f40eSjeff.liu } /* equal, nothing need to do */ 1693f46b5a66SChristoph Hellwig 1694faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1695faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1696faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1697faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 1698faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1699c9e9f97bSIlya Dryomov out_free: 1700f46b5a66SChristoph Hellwig kfree(vol_args); 1701c9e9f97bSIlya Dryomov out: 1702c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 170318f39c41SIlya Dryomov mnt_drop_write_file(file); 1704f46b5a66SChristoph Hellwig return ret; 1705f46b5a66SChristoph Hellwig } 1706f46b5a66SChristoph Hellwig 17075d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 170852f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 17095d54c67eSNikolay Borisov bool readonly, 17108696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1711f46b5a66SChristoph Hellwig { 1712f46b5a66SChristoph Hellwig int namelen; 17133de4586cSChris Mason int ret = 0; 1714f46b5a66SChristoph Hellwig 1715325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1716325c50e3SJeff Mahoney return -ENOTDIR; 1717325c50e3SJeff Mahoney 1718a874a63eSLiu Bo ret = mnt_want_write_file(file); 1719a874a63eSLiu Bo if (ret) 1720a874a63eSLiu Bo goto out; 1721a874a63eSLiu Bo 172272fd032eSSage Weil namelen = strlen(name); 172372fd032eSSage Weil if (strchr(name, '/')) { 1724f46b5a66SChristoph Hellwig ret = -EINVAL; 1725a874a63eSLiu Bo goto out_drop_write; 1726f46b5a66SChristoph Hellwig } 1727f46b5a66SChristoph Hellwig 172816780cabSChris Mason if (name[0] == '.' && 172916780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 173016780cabSChris Mason ret = -EEXIST; 1731a874a63eSLiu Bo goto out_drop_write; 173216780cabSChris Mason } 173316780cabSChris Mason 17343de4586cSChris Mason if (subvol) { 173572fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 17365d54c67eSNikolay Borisov NULL, readonly, inherit); 1737cb8e7090SChristoph Hellwig } else { 17382903ff01SAl Viro struct fd src = fdget(fd); 17393de4586cSChris Mason struct inode *src_inode; 17402903ff01SAl Viro if (!src.file) { 17413de4586cSChris Mason ret = -EINVAL; 1742a874a63eSLiu Bo goto out_drop_write; 17433de4586cSChris Mason } 17443de4586cSChris Mason 1745496ad9aaSAl Viro src_inode = file_inode(src.file); 1746496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1747c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1748efe120a0SFrank Holton "Snapshot src from another FS"); 174923ad5b17SKusanagi Kouichi ret = -EXDEV; 175021cb47beSChristian Brauner } else if (!inode_owner_or_capable(&init_user_ns, src_inode)) { 1751d0242061SDavid Sterba /* 1752d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1753d0242061SDavid Sterba * are limited to own subvolumes only 1754d0242061SDavid Sterba */ 1755d0242061SDavid Sterba ret = -EPERM; 1756ecd18815SAl Viro } else { 1757c11fbb6eSRobbie Ko ret = btrfs_mksnapshot(&file->f_path, name, namelen, 175872fd032eSSage Weil BTRFS_I(src_inode)->root, 17595d54c67eSNikolay Borisov readonly, inherit); 1760ecd18815SAl Viro } 17612903ff01SAl Viro fdput(src); 1762cb8e7090SChristoph Hellwig } 1763a874a63eSLiu Bo out_drop_write: 1764a874a63eSLiu Bo mnt_drop_write_file(file); 1765f46b5a66SChristoph Hellwig out: 176672fd032eSSage Weil return ret; 176772fd032eSSage Weil } 176872fd032eSSage Weil 176972fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1770fa0d2b9bSLi Zefan void __user *arg, int subvol) 177172fd032eSSage Weil { 1772fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 177372fd032eSSage Weil int ret; 177472fd032eSSage Weil 1775325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1776325c50e3SJeff Mahoney return -ENOTDIR; 1777325c50e3SJeff Mahoney 1778fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1779fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1780fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1781fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1782fa0d2b9bSLi Zefan 17835d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 17845d54c67eSNikolay Borisov subvol, false, NULL); 1785fa0d2b9bSLi Zefan 1786fa0d2b9bSLi Zefan kfree(vol_args); 1787fa0d2b9bSLi Zefan return ret; 1788fa0d2b9bSLi Zefan } 1789fa0d2b9bSLi Zefan 1790fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1791fa0d2b9bSLi Zefan void __user *arg, int subvol) 1792fa0d2b9bSLi Zefan { 1793fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1794fa0d2b9bSLi Zefan int ret; 1795b83cc969SLi Zefan bool readonly = false; 17966f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 179772fd032eSSage Weil 1798325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1799325c50e3SJeff Mahoney return -ENOTDIR; 1800325c50e3SJeff Mahoney 1801fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1802fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1803fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1804fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1805fdfb1e4fSLi Zefan 1806673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 1807b83cc969SLi Zefan ret = -EOPNOTSUPP; 1808c47ca32dSDan Carpenter goto free_args; 1809fdfb1e4fSLi Zefan } 1810fdfb1e4fSLi Zefan 1811b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1812b83cc969SLi Zefan readonly = true; 18136f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 18145011c5a6SDan Carpenter u64 nums; 18155011c5a6SDan Carpenter 18165011c5a6SDan Carpenter if (vol_args->size < sizeof(*inherit) || 18175011c5a6SDan Carpenter vol_args->size > PAGE_SIZE) { 18186f72c7e2SArne Jansen ret = -EINVAL; 1819c47ca32dSDan Carpenter goto free_args; 18206f72c7e2SArne Jansen } 18216f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 18226f72c7e2SArne Jansen if (IS_ERR(inherit)) { 18236f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1824c47ca32dSDan Carpenter goto free_args; 18256f72c7e2SArne Jansen } 18265011c5a6SDan Carpenter 18275011c5a6SDan Carpenter if (inherit->num_qgroups > PAGE_SIZE || 18285011c5a6SDan Carpenter inherit->num_ref_copies > PAGE_SIZE || 18295011c5a6SDan Carpenter inherit->num_excl_copies > PAGE_SIZE) { 18305011c5a6SDan Carpenter ret = -EINVAL; 18315011c5a6SDan Carpenter goto free_inherit; 18325011c5a6SDan Carpenter } 18335011c5a6SDan Carpenter 18345011c5a6SDan Carpenter nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + 18355011c5a6SDan Carpenter 2 * inherit->num_excl_copies; 18365011c5a6SDan Carpenter if (vol_args->size != struct_size(inherit, qgroups, nums)) { 18375011c5a6SDan Carpenter ret = -EINVAL; 18385011c5a6SDan Carpenter goto free_inherit; 18395011c5a6SDan Carpenter } 18406f72c7e2SArne Jansen } 184175eaa0e2SSage Weil 18425d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 18435d54c67eSNikolay Borisov subvol, readonly, inherit); 1844c47ca32dSDan Carpenter if (ret) 1845c47ca32dSDan Carpenter goto free_inherit; 1846c47ca32dSDan Carpenter free_inherit: 18476f72c7e2SArne Jansen kfree(inherit); 1848c47ca32dSDan Carpenter free_args: 1849c47ca32dSDan Carpenter kfree(vol_args); 1850f46b5a66SChristoph Hellwig return ret; 1851f46b5a66SChristoph Hellwig } 1852f46b5a66SChristoph Hellwig 18530caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 18540caa102dSLi Zefan void __user *arg) 18550caa102dSLi Zefan { 1856496ad9aaSAl Viro struct inode *inode = file_inode(file); 18570b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 18580caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 18590caa102dSLi Zefan int ret = 0; 18600caa102dSLi Zefan u64 flags = 0; 18610caa102dSLi Zefan 18624a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 18630caa102dSLi Zefan return -EINVAL; 18640caa102dSLi Zefan 18650b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 18660caa102dSLi Zefan if (btrfs_root_readonly(root)) 18670caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 18680b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 18690caa102dSLi Zefan 18700caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 18710caa102dSLi Zefan ret = -EFAULT; 18720caa102dSLi Zefan 18730caa102dSLi Zefan return ret; 18740caa102dSLi Zefan } 18750caa102dSLi Zefan 18760caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 18770caa102dSLi Zefan void __user *arg) 18780caa102dSLi Zefan { 1879496ad9aaSAl Viro struct inode *inode = file_inode(file); 18800b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 18810caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 18820caa102dSLi Zefan struct btrfs_trans_handle *trans; 18830caa102dSLi Zefan u64 root_flags; 18840caa102dSLi Zefan u64 flags; 18850caa102dSLi Zefan int ret = 0; 18860caa102dSLi Zefan 188721cb47beSChristian Brauner if (!inode_owner_or_capable(&init_user_ns, inode)) 1888bd60ea0fSDavid Sterba return -EPERM; 1889bd60ea0fSDavid Sterba 1890b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1891b9ca0664SLiu Bo if (ret) 1892b9ca0664SLiu Bo goto out; 18930caa102dSLi Zefan 18944a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 1895b9ca0664SLiu Bo ret = -EINVAL; 1896b9ca0664SLiu Bo goto out_drop_write; 1897b9ca0664SLiu Bo } 18980caa102dSLi Zefan 1899b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1900b9ca0664SLiu Bo ret = -EFAULT; 1901b9ca0664SLiu Bo goto out_drop_write; 1902b9ca0664SLiu Bo } 19030caa102dSLi Zefan 1904b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1905b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1906b9ca0664SLiu Bo goto out_drop_write; 1907b9ca0664SLiu Bo } 19080caa102dSLi Zefan 19090b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 19100caa102dSLi Zefan 19110caa102dSLi Zefan /* nothing to do */ 19120caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1913b9ca0664SLiu Bo goto out_drop_sem; 19140caa102dSLi Zefan 19150caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 19162c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 19170caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 19180caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 19192c686537SDavid Sterba } else { 19202c686537SDavid Sterba /* 19212c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 19222c686537SDavid Sterba * send 19232c686537SDavid Sterba */ 19242c686537SDavid Sterba spin_lock(&root->root_item_lock); 19252c686537SDavid Sterba if (root->send_in_progress == 0) { 19260caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 19270caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 19282c686537SDavid Sterba spin_unlock(&root->root_item_lock); 19292c686537SDavid Sterba } else { 19302c686537SDavid Sterba spin_unlock(&root->root_item_lock); 19310b246afaSJeff Mahoney btrfs_warn(fs_info, 19322c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 19332c686537SDavid Sterba root->root_key.objectid); 19342c686537SDavid Sterba ret = -EPERM; 19352c686537SDavid Sterba goto out_drop_sem; 19362c686537SDavid Sterba } 19372c686537SDavid Sterba } 19380caa102dSLi Zefan 19390caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 19400caa102dSLi Zefan if (IS_ERR(trans)) { 19410caa102dSLi Zefan ret = PTR_ERR(trans); 19420caa102dSLi Zefan goto out_reset; 19430caa102dSLi Zefan } 19440caa102dSLi Zefan 19450b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 19460caa102dSLi Zefan &root->root_key, &root->root_item); 19479417ebc8SNikolay Borisov if (ret < 0) { 19489417ebc8SNikolay Borisov btrfs_end_transaction(trans); 19499417ebc8SNikolay Borisov goto out_reset; 19509417ebc8SNikolay Borisov } 19510caa102dSLi Zefan 19529417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 19539417ebc8SNikolay Borisov 19540caa102dSLi Zefan out_reset: 19550caa102dSLi Zefan if (ret) 19560caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1957b9ca0664SLiu Bo out_drop_sem: 19580b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 1959b9ca0664SLiu Bo out_drop_write: 1960b9ca0664SLiu Bo mnt_drop_write_file(file); 1961b9ca0664SLiu Bo out: 19620caa102dSLi Zefan return ret; 19630caa102dSLi Zefan } 19640caa102dSLi Zefan 1965ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1966ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1967ac8e9819SChris Mason { 1968abc6e134SChris Mason struct btrfs_key test; 1969abc6e134SChris Mason int ret; 1970abc6e134SChris Mason 1971abc6e134SChris Mason test.objectid = sk->min_objectid; 1972abc6e134SChris Mason test.type = sk->min_type; 1973abc6e134SChris Mason test.offset = sk->min_offset; 1974abc6e134SChris Mason 1975abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1976abc6e134SChris Mason if (ret < 0) 1977ac8e9819SChris Mason return 0; 1978abc6e134SChris Mason 1979abc6e134SChris Mason test.objectid = sk->max_objectid; 1980abc6e134SChris Mason test.type = sk->max_type; 1981abc6e134SChris Mason test.offset = sk->max_offset; 1982abc6e134SChris Mason 1983abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1984abc6e134SChris Mason if (ret > 0) 1985ac8e9819SChris Mason return 0; 1986ac8e9819SChris Mason return 1; 1987ac8e9819SChris Mason } 1988ac8e9819SChris Mason 1989df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 1990ac8e9819SChris Mason struct btrfs_key *key, 1991ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 19929b6e817dSGerhard Heift size_t *buf_size, 1993ba346b35SGerhard Heift char __user *ubuf, 1994ac8e9819SChris Mason unsigned long *sk_offset, 1995ac8e9819SChris Mason int *num_found) 1996ac8e9819SChris Mason { 1997ac8e9819SChris Mason u64 found_transid; 1998ac8e9819SChris Mason struct extent_buffer *leaf; 1999ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2000dd81d459SNaohiro Aota struct btrfs_key test; 2001ac8e9819SChris Mason unsigned long item_off; 2002ac8e9819SChris Mason unsigned long item_len; 2003ac8e9819SChris Mason int nritems; 2004ac8e9819SChris Mason int i; 2005ac8e9819SChris Mason int slot; 2006ac8e9819SChris Mason int ret = 0; 2007ac8e9819SChris Mason 2008ac8e9819SChris Mason leaf = path->nodes[0]; 2009ac8e9819SChris Mason slot = path->slots[0]; 2010ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2011ac8e9819SChris Mason 2012ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2013ac8e9819SChris Mason i = nritems; 2014ac8e9819SChris Mason goto advance_key; 2015ac8e9819SChris Mason } 2016ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2017ac8e9819SChris Mason 2018ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2019ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 2020ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 2021ac8e9819SChris Mason 202203b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 202303b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 202403b71c6cSGabriel de Perthuis continue; 202503b71c6cSGabriel de Perthuis 20269b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 20278f5f6178SGerhard Heift if (*num_found) { 2028ac8e9819SChris Mason ret = 1; 20298f5f6178SGerhard Heift goto out; 20308f5f6178SGerhard Heift } 20318f5f6178SGerhard Heift 20328f5f6178SGerhard Heift /* 20338f5f6178SGerhard Heift * return one empty item back for v1, which does not 20348f5f6178SGerhard Heift * handle -EOVERFLOW 20358f5f6178SGerhard Heift */ 20368f5f6178SGerhard Heift 20379b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2038ac8e9819SChris Mason item_len = 0; 20398f5f6178SGerhard Heift ret = -EOVERFLOW; 20408f5f6178SGerhard Heift } 2041ac8e9819SChris Mason 20429b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2043ac8e9819SChris Mason ret = 1; 204425c9bc2eSGerhard Heift goto out; 2045ac8e9819SChris Mason } 2046ac8e9819SChris Mason 2047ac8e9819SChris Mason sh.objectid = key->objectid; 2048ac8e9819SChris Mason sh.offset = key->offset; 2049ac8e9819SChris Mason sh.type = key->type; 2050ac8e9819SChris Mason sh.len = item_len; 2051ac8e9819SChris Mason sh.transid = found_transid; 2052ac8e9819SChris Mason 2053a48b73ecSJosef Bacik /* 2054a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 2055a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 2056a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 2057a48b73ecSJosef Bacik * properly this next time through 2058a48b73ecSJosef Bacik */ 2059a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 2060a48b73ecSJosef Bacik ret = 0; 2061ba346b35SGerhard Heift goto out; 2062ba346b35SGerhard Heift } 2063ba346b35SGerhard Heift 2064ac8e9819SChris Mason *sk_offset += sizeof(sh); 2065ac8e9819SChris Mason 2066ac8e9819SChris Mason if (item_len) { 2067ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2068a48b73ecSJosef Bacik /* 2069a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 2070a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 2071a48b73ecSJosef Bacik */ 2072a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 2073ba346b35SGerhard Heift item_off, item_len)) { 2074a48b73ecSJosef Bacik ret = 0; 2075a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 2076ba346b35SGerhard Heift goto out; 2077ba346b35SGerhard Heift } 2078ba346b35SGerhard Heift 2079ac8e9819SChris Mason *sk_offset += item_len; 2080ac8e9819SChris Mason } 2081e2156867SHugo Mills (*num_found)++; 2082ac8e9819SChris Mason 20838f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 20848f5f6178SGerhard Heift goto out; 20858f5f6178SGerhard Heift 208625c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 208725c9bc2eSGerhard Heift ret = 1; 208825c9bc2eSGerhard Heift goto out; 208925c9bc2eSGerhard Heift } 2090ac8e9819SChris Mason } 2091ac8e9819SChris Mason advance_key: 2092ac8e9819SChris Mason ret = 0; 2093dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2094dd81d459SNaohiro Aota test.type = sk->max_type; 2095dd81d459SNaohiro Aota test.offset = sk->max_offset; 2096dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2097dd81d459SNaohiro Aota ret = 1; 2098dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2099abc6e134SChris Mason key->offset++; 2100dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2101abc6e134SChris Mason key->offset = 0; 2102abc6e134SChris Mason key->type++; 2103dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2104abc6e134SChris Mason key->offset = 0; 2105abc6e134SChris Mason key->type = 0; 2106abc6e134SChris Mason key->objectid++; 2107abc6e134SChris Mason } else 2108abc6e134SChris Mason ret = 1; 210925c9bc2eSGerhard Heift out: 2110ba346b35SGerhard Heift /* 2111ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2112ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2113ba346b35SGerhard Heift * * all items were found 2114ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2115ba346b35SGerhard Heift * leaf 2116ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2117ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2118ba346b35SGerhard Heift */ 2119ac8e9819SChris Mason return ret; 2120ac8e9819SChris Mason } 2121ac8e9819SChris Mason 2122ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 212312544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 21249b6e817dSGerhard Heift size_t *buf_size, 2125ba346b35SGerhard Heift char __user *ubuf) 2126ac8e9819SChris Mason { 21270b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2128ac8e9819SChris Mason struct btrfs_root *root; 2129ac8e9819SChris Mason struct btrfs_key key; 2130ac8e9819SChris Mason struct btrfs_path *path; 2131ac8e9819SChris Mason int ret; 2132ac8e9819SChris Mason int num_found = 0; 2133ac8e9819SChris Mason unsigned long sk_offset = 0; 2134ac8e9819SChris Mason 21359b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 21369b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 213712544442SGerhard Heift return -EOVERFLOW; 21389b6e817dSGerhard Heift } 213912544442SGerhard Heift 2140ac8e9819SChris Mason path = btrfs_alloc_path(); 2141ac8e9819SChris Mason if (!path) 2142ac8e9819SChris Mason return -ENOMEM; 2143ac8e9819SChris Mason 2144ac8e9819SChris Mason if (sk->tree_id == 0) { 2145ac8e9819SChris Mason /* search the root of the inode that was passed */ 214600246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2147ac8e9819SChris Mason } else { 214856e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2149ac8e9819SChris Mason if (IS_ERR(root)) { 2150ac8e9819SChris Mason btrfs_free_path(path); 2151ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2152ac8e9819SChris Mason } 2153ac8e9819SChris Mason } 2154ac8e9819SChris Mason 2155ac8e9819SChris Mason key.objectid = sk->min_objectid; 2156ac8e9819SChris Mason key.type = sk->min_type; 2157ac8e9819SChris Mason key.offset = sk->min_offset; 2158ac8e9819SChris Mason 2159ac8e9819SChris Mason while (1) { 21601c78544eSFilipe Manana ret = fault_in_pages_writeable(ubuf + sk_offset, 21611c78544eSFilipe Manana *buf_size - sk_offset); 2162a48b73ecSJosef Bacik if (ret) 2163a48b73ecSJosef Bacik break; 2164a48b73ecSJosef Bacik 21656174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2166ac8e9819SChris Mason if (ret != 0) { 2167ac8e9819SChris Mason if (ret > 0) 2168ac8e9819SChris Mason ret = 0; 2169ac8e9819SChris Mason goto err; 2170ac8e9819SChris Mason } 2171df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2172ac8e9819SChris Mason &sk_offset, &num_found); 2173b3b4aa74SDavid Sterba btrfs_release_path(path); 217425c9bc2eSGerhard Heift if (ret) 2175ac8e9819SChris Mason break; 2176ac8e9819SChris Mason 2177ac8e9819SChris Mason } 21788f5f6178SGerhard Heift if (ret > 0) 2179ac8e9819SChris Mason ret = 0; 2180ac8e9819SChris Mason err: 2181ac8e9819SChris Mason sk->nr_items = num_found; 218200246528SJosef Bacik btrfs_put_root(root); 2183ac8e9819SChris Mason btrfs_free_path(path); 2184ac8e9819SChris Mason return ret; 2185ac8e9819SChris Mason } 2186ac8e9819SChris Mason 2187ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2188ac8e9819SChris Mason void __user *argp) 2189ac8e9819SChris Mason { 2190ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2191ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2192ac8e9819SChris Mason struct inode *inode; 2193ac8e9819SChris Mason int ret; 21949b6e817dSGerhard Heift size_t buf_size; 2195ac8e9819SChris Mason 2196ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2197ac8e9819SChris Mason return -EPERM; 2198ac8e9819SChris Mason 2199ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2200ac8e9819SChris Mason 2201ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2202ba346b35SGerhard Heift return -EFAULT; 2203ba346b35SGerhard Heift 2204ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2205ac8e9819SChris Mason 2206496ad9aaSAl Viro inode = file_inode(file); 2207ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 22088f5f6178SGerhard Heift 22098f5f6178SGerhard Heift /* 22108f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 22118f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 22128f5f6178SGerhard Heift */ 22138f5f6178SGerhard Heift if (ret == -EOVERFLOW) 22148f5f6178SGerhard Heift ret = 0; 22158f5f6178SGerhard Heift 2216ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2217ac8e9819SChris Mason ret = -EFAULT; 2218ac8e9819SChris Mason return ret; 2219ac8e9819SChris Mason } 2220ac8e9819SChris Mason 2221cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2222cc68a8a5SGerhard Heift void __user *argp) 2223cc68a8a5SGerhard Heift { 2224cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2225cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2226cc68a8a5SGerhard Heift struct inode *inode; 2227cc68a8a5SGerhard Heift int ret; 2228cc68a8a5SGerhard Heift size_t buf_size; 2229ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2230cc68a8a5SGerhard Heift 2231cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2232cc68a8a5SGerhard Heift return -EPERM; 2233cc68a8a5SGerhard Heift 2234cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2235cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2236cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2237cc68a8a5SGerhard Heift return -EFAULT; 2238cc68a8a5SGerhard Heift 2239cc68a8a5SGerhard Heift buf_size = args.buf_size; 2240cc68a8a5SGerhard Heift 2241cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2242cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2243cc68a8a5SGerhard Heift buf_size = buf_limit; 2244cc68a8a5SGerhard Heift 2245cc68a8a5SGerhard Heift inode = file_inode(file); 2246cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2247718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2248cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2249cc68a8a5SGerhard Heift ret = -EFAULT; 2250cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2251cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2252cc68a8a5SGerhard Heift ret = -EFAULT; 2253cc68a8a5SGerhard Heift 225476dda93cSYan, Zheng return ret; 225576dda93cSYan, Zheng } 225676dda93cSYan, Zheng 225798d377a0STARUISI Hiroaki /* 2258ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2259ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 226098d377a0STARUISI Hiroaki */ 226198d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 226298d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 226398d377a0STARUISI Hiroaki { 226498d377a0STARUISI Hiroaki struct btrfs_root *root; 226598d377a0STARUISI Hiroaki struct btrfs_key key; 2266ac8e9819SChris Mason char *ptr; 226798d377a0STARUISI Hiroaki int ret = -1; 226898d377a0STARUISI Hiroaki int slot; 226998d377a0STARUISI Hiroaki int len; 227098d377a0STARUISI Hiroaki int total_len = 0; 227198d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 227298d377a0STARUISI Hiroaki struct extent_buffer *l; 227398d377a0STARUISI Hiroaki struct btrfs_path *path; 227498d377a0STARUISI Hiroaki 227598d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 227698d377a0STARUISI Hiroaki name[0]='\0'; 227798d377a0STARUISI Hiroaki return 0; 227898d377a0STARUISI Hiroaki } 227998d377a0STARUISI Hiroaki 228098d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 228198d377a0STARUISI Hiroaki if (!path) 228298d377a0STARUISI Hiroaki return -ENOMEM; 228398d377a0STARUISI Hiroaki 2284c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 228598d377a0STARUISI Hiroaki 228656e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 228798d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2288ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 228988234012SJosef Bacik root = NULL; 229088234012SJosef Bacik goto out; 229188234012SJosef Bacik } 229298d377a0STARUISI Hiroaki 229398d377a0STARUISI Hiroaki key.objectid = dirid; 229498d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 22958ad6fcabSChris Mason key.offset = (u64)-1; 229698d377a0STARUISI Hiroaki 229798d377a0STARUISI Hiroaki while (1) { 229898d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 229998d377a0STARUISI Hiroaki if (ret < 0) 230098d377a0STARUISI Hiroaki goto out; 230118674c6cSFilipe David Borba Manana else if (ret > 0) { 230218674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 230318674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 230418674c6cSFilipe David Borba Manana if (ret < 0) 230518674c6cSFilipe David Borba Manana goto out; 230618674c6cSFilipe David Borba Manana else if (ret > 0) { 2307ac8e9819SChris Mason ret = -ENOENT; 230898d377a0STARUISI Hiroaki goto out; 2309ac8e9819SChris Mason } 231018674c6cSFilipe David Borba Manana } 231118674c6cSFilipe David Borba Manana 231218674c6cSFilipe David Borba Manana l = path->nodes[0]; 231318674c6cSFilipe David Borba Manana slot = path->slots[0]; 231418674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 231598d377a0STARUISI Hiroaki 231698d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 231798d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 231898d377a0STARUISI Hiroaki ptr -= len + 1; 231998d377a0STARUISI Hiroaki total_len += len + 1; 2320a696cf35SFilipe David Borba Manana if (ptr < name) { 2321a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 232298d377a0STARUISI Hiroaki goto out; 2323a696cf35SFilipe David Borba Manana } 232498d377a0STARUISI Hiroaki 232598d377a0STARUISI Hiroaki *(ptr + len) = '/'; 232698d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 232798d377a0STARUISI Hiroaki 232898d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 232998d377a0STARUISI Hiroaki break; 233098d377a0STARUISI Hiroaki 2331b3b4aa74SDavid Sterba btrfs_release_path(path); 233298d377a0STARUISI Hiroaki key.objectid = key.offset; 23338ad6fcabSChris Mason key.offset = (u64)-1; 233498d377a0STARUISI Hiroaki dirid = key.objectid; 233598d377a0STARUISI Hiroaki } 233677906a50SLi Zefan memmove(name, ptr, total_len); 233798d377a0STARUISI Hiroaki name[total_len] = '\0'; 233898d377a0STARUISI Hiroaki ret = 0; 233998d377a0STARUISI Hiroaki out: 234000246528SJosef Bacik btrfs_put_root(root); 234198d377a0STARUISI Hiroaki btrfs_free_path(path); 2342ac8e9819SChris Mason return ret; 2343ac8e9819SChris Mason } 2344ac8e9819SChris Mason 234523d0b79dSTomohiro Misono static int btrfs_search_path_in_tree_user(struct inode *inode, 234623d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 234723d0b79dSTomohiro Misono { 234823d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 234923d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 235023d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 235123d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 235223d0b79dSTomohiro Misono u64 dirid = args->dirid; 235323d0b79dSTomohiro Misono unsigned long item_off; 235423d0b79dSTomohiro Misono unsigned long item_len; 235523d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 235623d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2357b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 235823d0b79dSTomohiro Misono struct btrfs_path *path; 235923d0b79dSTomohiro Misono struct btrfs_key key, key2; 236023d0b79dSTomohiro Misono struct extent_buffer *leaf; 236123d0b79dSTomohiro Misono struct inode *temp_inode; 236223d0b79dSTomohiro Misono char *ptr; 236323d0b79dSTomohiro Misono int slot; 236423d0b79dSTomohiro Misono int len; 236523d0b79dSTomohiro Misono int total_len = 0; 236623d0b79dSTomohiro Misono int ret; 236723d0b79dSTomohiro Misono 236823d0b79dSTomohiro Misono path = btrfs_alloc_path(); 236923d0b79dSTomohiro Misono if (!path) 237023d0b79dSTomohiro Misono return -ENOMEM; 237123d0b79dSTomohiro Misono 237223d0b79dSTomohiro Misono /* 237323d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 237423d0b79dSTomohiro Misono * construct the path in from the bottom up. 237523d0b79dSTomohiro Misono */ 237623d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 237723d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 237823d0b79dSTomohiro Misono 237956e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 238023d0b79dSTomohiro Misono if (IS_ERR(root)) { 238123d0b79dSTomohiro Misono ret = PTR_ERR(root); 238223d0b79dSTomohiro Misono goto out; 238323d0b79dSTomohiro Misono } 238423d0b79dSTomohiro Misono 238523d0b79dSTomohiro Misono key.objectid = dirid; 238623d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 238723d0b79dSTomohiro Misono key.offset = (u64)-1; 238823d0b79dSTomohiro Misono while (1) { 238923d0b79dSTomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 239023d0b79dSTomohiro Misono if (ret < 0) { 2391b8a49ae1SJosef Bacik goto out_put; 239223d0b79dSTomohiro Misono } else if (ret > 0) { 239323d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 239423d0b79dSTomohiro Misono BTRFS_INODE_REF_KEY); 239523d0b79dSTomohiro Misono if (ret < 0) { 2396b8a49ae1SJosef Bacik goto out_put; 239723d0b79dSTomohiro Misono } else if (ret > 0) { 239823d0b79dSTomohiro Misono ret = -ENOENT; 2399b8a49ae1SJosef Bacik goto out_put; 240023d0b79dSTomohiro Misono } 240123d0b79dSTomohiro Misono } 240223d0b79dSTomohiro Misono 240323d0b79dSTomohiro Misono leaf = path->nodes[0]; 240423d0b79dSTomohiro Misono slot = path->slots[0]; 240523d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 240623d0b79dSTomohiro Misono 240723d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 240823d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 240923d0b79dSTomohiro Misono ptr -= len + 1; 241023d0b79dSTomohiro Misono total_len += len + 1; 241123d0b79dSTomohiro Misono if (ptr < args->path) { 241223d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2413b8a49ae1SJosef Bacik goto out_put; 241423d0b79dSTomohiro Misono } 241523d0b79dSTomohiro Misono 241623d0b79dSTomohiro Misono *(ptr + len) = '/'; 241723d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 241823d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 241923d0b79dSTomohiro Misono 242023d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 242123d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 242223d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 242323d0b79dSTomohiro Misono if (ret < 0) { 2424b8a49ae1SJosef Bacik goto out_put; 242523d0b79dSTomohiro Misono } else if (ret > 0) { 242623d0b79dSTomohiro Misono ret = -ENOENT; 2427b8a49ae1SJosef Bacik goto out_put; 242823d0b79dSTomohiro Misono } 242923d0b79dSTomohiro Misono 243023d0b79dSTomohiro Misono leaf = path->nodes[0]; 243123d0b79dSTomohiro Misono slot = path->slots[0]; 243223d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 243323d0b79dSTomohiro Misono if (key2.objectid != dirid) { 243423d0b79dSTomohiro Misono ret = -ENOENT; 2435b8a49ae1SJosef Bacik goto out_put; 243623d0b79dSTomohiro Misono } 243723d0b79dSTomohiro Misono 24380202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 24393ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 24403ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2441b8a49ae1SJosef Bacik goto out_put; 24423ca57bd6SMisono Tomohiro } 244347291baaSChristian Brauner ret = inode_permission(&init_user_ns, temp_inode, 244447291baaSChristian Brauner MAY_READ | MAY_EXEC); 244523d0b79dSTomohiro Misono iput(temp_inode); 244623d0b79dSTomohiro Misono if (ret) { 244723d0b79dSTomohiro Misono ret = -EACCES; 2448b8a49ae1SJosef Bacik goto out_put; 244923d0b79dSTomohiro Misono } 245023d0b79dSTomohiro Misono 245123d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 245223d0b79dSTomohiro Misono break; 245323d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 245423d0b79dSTomohiro Misono ret = -EACCES; 2455b8a49ae1SJosef Bacik goto out_put; 245623d0b79dSTomohiro Misono } 245723d0b79dSTomohiro Misono 245823d0b79dSTomohiro Misono btrfs_release_path(path); 245923d0b79dSTomohiro Misono key.objectid = key.offset; 246023d0b79dSTomohiro Misono key.offset = (u64)-1; 246123d0b79dSTomohiro Misono dirid = key.objectid; 246223d0b79dSTomohiro Misono } 246323d0b79dSTomohiro Misono 246423d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 246523d0b79dSTomohiro Misono args->path[total_len] = '\0'; 246600246528SJosef Bacik btrfs_put_root(root); 2467b8a49ae1SJosef Bacik root = NULL; 246823d0b79dSTomohiro Misono btrfs_release_path(path); 246923d0b79dSTomohiro Misono } 247023d0b79dSTomohiro Misono 247123d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 247223d0b79dSTomohiro Misono key.objectid = treeid; 247323d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 247423d0b79dSTomohiro Misono key.offset = args->treeid; 2475b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 247623d0b79dSTomohiro Misono if (ret < 0) { 247723d0b79dSTomohiro Misono goto out; 247823d0b79dSTomohiro Misono } else if (ret > 0) { 247923d0b79dSTomohiro Misono ret = -ENOENT; 248023d0b79dSTomohiro Misono goto out; 248123d0b79dSTomohiro Misono } 248223d0b79dSTomohiro Misono 248323d0b79dSTomohiro Misono leaf = path->nodes[0]; 248423d0b79dSTomohiro Misono slot = path->slots[0]; 248523d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 248623d0b79dSTomohiro Misono 248723d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 248823d0b79dSTomohiro Misono item_len = btrfs_item_size_nr(leaf, slot); 248923d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 249023d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 249123d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 249223d0b79dSTomohiro Misono ret = -EINVAL; 249323d0b79dSTomohiro Misono goto out; 249423d0b79dSTomohiro Misono } 249523d0b79dSTomohiro Misono 249623d0b79dSTomohiro Misono /* Copy subvolume's name */ 249723d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 249823d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 249923d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 250023d0b79dSTomohiro Misono args->name[item_len] = 0; 250123d0b79dSTomohiro Misono 2502b8a49ae1SJosef Bacik out_put: 250300246528SJosef Bacik btrfs_put_root(root); 250423d0b79dSTomohiro Misono out: 250523d0b79dSTomohiro Misono btrfs_free_path(path); 250623d0b79dSTomohiro Misono return ret; 250723d0b79dSTomohiro Misono } 250823d0b79dSTomohiro Misono 2509ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2510ac8e9819SChris Mason void __user *argp) 2511ac8e9819SChris Mason { 2512ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2513ac8e9819SChris Mason struct inode *inode; 251401b810b8SDavid Sterba int ret = 0; 2515ac8e9819SChris Mason 25162354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 25172354d08fSJulia Lawall if (IS_ERR(args)) 25182354d08fSJulia Lawall return PTR_ERR(args); 2519c2b96929SDan Carpenter 2520496ad9aaSAl Viro inode = file_inode(file); 2521ac8e9819SChris Mason 252201b810b8SDavid Sterba /* 252301b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 252401b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 252501b810b8SDavid Sterba */ 25261b53ac4dSChris Mason if (args->treeid == 0) 25271b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 25281b53ac4dSChris Mason 252901b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 253001b810b8SDavid Sterba args->name[0] = 0; 253101b810b8SDavid Sterba goto out; 253201b810b8SDavid Sterba } 253301b810b8SDavid Sterba 253401b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 253501b810b8SDavid Sterba ret = -EPERM; 253601b810b8SDavid Sterba goto out; 253701b810b8SDavid Sterba } 253801b810b8SDavid Sterba 2539ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2540ac8e9819SChris Mason args->treeid, args->objectid, 2541ac8e9819SChris Mason args->name); 2542ac8e9819SChris Mason 254301b810b8SDavid Sterba out: 2544ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2545ac8e9819SChris Mason ret = -EFAULT; 2546ac8e9819SChris Mason 2547ac8e9819SChris Mason kfree(args); 254898d377a0STARUISI Hiroaki return ret; 254998d377a0STARUISI Hiroaki } 255098d377a0STARUISI Hiroaki 255123d0b79dSTomohiro Misono /* 255223d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 255323d0b79dSTomohiro Misono * 255423d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 255523d0b79dSTomohiro Misono * 255623d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 255723d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 255823d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 255923d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 256023d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 256123d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 256223d0b79dSTomohiro Misono */ 256323d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 256423d0b79dSTomohiro Misono { 256523d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 256623d0b79dSTomohiro Misono struct inode *inode; 256723d0b79dSTomohiro Misono int ret; 256823d0b79dSTomohiro Misono 256923d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 257023d0b79dSTomohiro Misono if (IS_ERR(args)) 257123d0b79dSTomohiro Misono return PTR_ERR(args); 257223d0b79dSTomohiro Misono 257323d0b79dSTomohiro Misono inode = file_inode(file); 257423d0b79dSTomohiro Misono 257523d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 257623d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 257723d0b79dSTomohiro Misono /* 257823d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 257923d0b79dSTomohiro Misono * called 258023d0b79dSTomohiro Misono */ 258123d0b79dSTomohiro Misono kfree(args); 258223d0b79dSTomohiro Misono return -EACCES; 258323d0b79dSTomohiro Misono } 258423d0b79dSTomohiro Misono 258523d0b79dSTomohiro Misono ret = btrfs_search_path_in_tree_user(inode, args); 258623d0b79dSTomohiro Misono 258723d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 258823d0b79dSTomohiro Misono ret = -EFAULT; 258923d0b79dSTomohiro Misono 259023d0b79dSTomohiro Misono kfree(args); 259123d0b79dSTomohiro Misono return ret; 259223d0b79dSTomohiro Misono } 259323d0b79dSTomohiro Misono 2594b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 2595b64ec075STomohiro Misono static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) 2596b64ec075STomohiro Misono { 2597b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2598b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2599b64ec075STomohiro Misono struct btrfs_root *root; 2600b64ec075STomohiro Misono struct btrfs_path *path; 2601b64ec075STomohiro Misono struct btrfs_key key; 2602b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2603b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2604b64ec075STomohiro Misono struct extent_buffer *leaf; 2605b64ec075STomohiro Misono unsigned long item_off; 2606b64ec075STomohiro Misono unsigned long item_len; 2607b64ec075STomohiro Misono struct inode *inode; 2608b64ec075STomohiro Misono int slot; 2609b64ec075STomohiro Misono int ret = 0; 2610b64ec075STomohiro Misono 2611b64ec075STomohiro Misono path = btrfs_alloc_path(); 2612b64ec075STomohiro Misono if (!path) 2613b64ec075STomohiro Misono return -ENOMEM; 2614b64ec075STomohiro Misono 2615b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2616b64ec075STomohiro Misono if (!subvol_info) { 2617b64ec075STomohiro Misono btrfs_free_path(path); 2618b64ec075STomohiro Misono return -ENOMEM; 2619b64ec075STomohiro Misono } 2620b64ec075STomohiro Misono 2621b64ec075STomohiro Misono inode = file_inode(file); 2622b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2623b64ec075STomohiro Misono 2624b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2625b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 262656e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2627b64ec075STomohiro Misono if (IS_ERR(root)) { 2628b64ec075STomohiro Misono ret = PTR_ERR(root); 262904734e84SJosef Bacik goto out_free; 263004734e84SJosef Bacik } 2631b64ec075STomohiro Misono root_item = &root->root_item; 2632b64ec075STomohiro Misono 2633b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2634b64ec075STomohiro Misono 2635b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2636b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2637b64ec075STomohiro Misono 2638b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2639b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2640b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2641b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2642b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2643b64ec075STomohiro Misono 2644b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2645b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2646b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2647b64ec075STomohiro Misono 2648b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2649b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2650b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2651b64ec075STomohiro Misono 2652b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2653b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2654b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2655b64ec075STomohiro Misono 2656b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2657b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2658b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2659b64ec075STomohiro Misono 2660b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2661b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2662b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2663b64ec075STomohiro Misono key.offset = 0; 266404734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2665b64ec075STomohiro Misono if (ret < 0) { 2666b64ec075STomohiro Misono goto out; 2667b64ec075STomohiro Misono } else if (path->slots[0] >= 2668b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 266904734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2670b64ec075STomohiro Misono if (ret < 0) { 2671b64ec075STomohiro Misono goto out; 2672b64ec075STomohiro Misono } else if (ret > 0) { 2673b64ec075STomohiro Misono ret = -EUCLEAN; 2674b64ec075STomohiro Misono goto out; 2675b64ec075STomohiro Misono } 2676b64ec075STomohiro Misono } 2677b64ec075STomohiro Misono 2678b64ec075STomohiro Misono leaf = path->nodes[0]; 2679b64ec075STomohiro Misono slot = path->slots[0]; 2680b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2681b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2682b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2683b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2684b64ec075STomohiro Misono 2685b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2686b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2687b64ec075STomohiro Misono 2688b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2689b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 2690b64ec075STomohiro Misono item_len = btrfs_item_size_nr(leaf, slot) 2691b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2692b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2693b64ec075STomohiro Misono item_off, item_len); 2694b64ec075STomohiro Misono } else { 2695b64ec075STomohiro Misono ret = -ENOENT; 2696b64ec075STomohiro Misono goto out; 2697b64ec075STomohiro Misono } 2698b64ec075STomohiro Misono } 2699b64ec075STomohiro Misono 2700b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2701b64ec075STomohiro Misono ret = -EFAULT; 2702b64ec075STomohiro Misono 2703b64ec075STomohiro Misono out: 270400246528SJosef Bacik btrfs_put_root(root); 270504734e84SJosef Bacik out_free: 2706b64ec075STomohiro Misono btrfs_free_path(path); 2707b091f7feSWaiman Long kfree(subvol_info); 2708b64ec075STomohiro Misono return ret; 2709b64ec075STomohiro Misono } 2710b64ec075STomohiro Misono 271142e4b520STomohiro Misono /* 271242e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 271342e4b520STomohiro Misono * except the subvolume name. 271442e4b520STomohiro Misono */ 271542e4b520STomohiro Misono static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp) 271642e4b520STomohiro Misono { 271742e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 271842e4b520STomohiro Misono struct btrfs_root_ref *rref; 271942e4b520STomohiro Misono struct btrfs_root *root; 272042e4b520STomohiro Misono struct btrfs_path *path; 272142e4b520STomohiro Misono struct btrfs_key key; 272242e4b520STomohiro Misono struct extent_buffer *leaf; 272342e4b520STomohiro Misono struct inode *inode; 272442e4b520STomohiro Misono u64 objectid; 272542e4b520STomohiro Misono int slot; 272642e4b520STomohiro Misono int ret; 272742e4b520STomohiro Misono u8 found; 272842e4b520STomohiro Misono 272942e4b520STomohiro Misono path = btrfs_alloc_path(); 273042e4b520STomohiro Misono if (!path) 273142e4b520STomohiro Misono return -ENOMEM; 273242e4b520STomohiro Misono 273342e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 273442e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 273542e4b520STomohiro Misono btrfs_free_path(path); 273642e4b520STomohiro Misono return PTR_ERR(rootrefs); 273742e4b520STomohiro Misono } 273842e4b520STomohiro Misono 273942e4b520STomohiro Misono inode = file_inode(file); 274042e4b520STomohiro Misono root = BTRFS_I(inode)->root->fs_info->tree_root; 274142e4b520STomohiro Misono objectid = BTRFS_I(inode)->root->root_key.objectid; 274242e4b520STomohiro Misono 274342e4b520STomohiro Misono key.objectid = objectid; 274442e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 274542e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 274642e4b520STomohiro Misono found = 0; 274742e4b520STomohiro Misono 274842e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 274942e4b520STomohiro Misono if (ret < 0) { 275042e4b520STomohiro Misono goto out; 275142e4b520STomohiro Misono } else if (path->slots[0] >= 275242e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 275342e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 275442e4b520STomohiro Misono if (ret < 0) { 275542e4b520STomohiro Misono goto out; 275642e4b520STomohiro Misono } else if (ret > 0) { 275742e4b520STomohiro Misono ret = -EUCLEAN; 275842e4b520STomohiro Misono goto out; 275942e4b520STomohiro Misono } 276042e4b520STomohiro Misono } 276142e4b520STomohiro Misono while (1) { 276242e4b520STomohiro Misono leaf = path->nodes[0]; 276342e4b520STomohiro Misono slot = path->slots[0]; 276442e4b520STomohiro Misono 276542e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 276642e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 276742e4b520STomohiro Misono ret = 0; 276842e4b520STomohiro Misono goto out; 276942e4b520STomohiro Misono } 277042e4b520STomohiro Misono 277142e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 277242e4b520STomohiro Misono ret = -EOVERFLOW; 277342e4b520STomohiro Misono goto out; 277442e4b520STomohiro Misono } 277542e4b520STomohiro Misono 277642e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 277742e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 277842e4b520STomohiro Misono rootrefs->rootref[found].dirid = 277942e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 278042e4b520STomohiro Misono found++; 278142e4b520STomohiro Misono 278242e4b520STomohiro Misono ret = btrfs_next_item(root, path); 278342e4b520STomohiro Misono if (ret < 0) { 278442e4b520STomohiro Misono goto out; 278542e4b520STomohiro Misono } else if (ret > 0) { 278642e4b520STomohiro Misono ret = -EUCLEAN; 278742e4b520STomohiro Misono goto out; 278842e4b520STomohiro Misono } 278942e4b520STomohiro Misono } 279042e4b520STomohiro Misono 279142e4b520STomohiro Misono out: 279242e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 279342e4b520STomohiro Misono rootrefs->num_items = found; 279442e4b520STomohiro Misono /* update min_treeid for next search */ 279542e4b520STomohiro Misono if (found) 279642e4b520STomohiro Misono rootrefs->min_treeid = 279742e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 279842e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 279942e4b520STomohiro Misono ret = -EFAULT; 280042e4b520STomohiro Misono } 280142e4b520STomohiro Misono 280242e4b520STomohiro Misono kfree(rootrefs); 280342e4b520STomohiro Misono btrfs_free_path(path); 280442e4b520STomohiro Misono 280542e4b520STomohiro Misono return ret; 280642e4b520STomohiro Misono } 280742e4b520STomohiro Misono 280876dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2809949964c9SMarcos Paulo de Souza void __user *arg, 2810949964c9SMarcos Paulo de Souza bool destroy_v2) 281176dda93cSYan, Zheng { 281254563d41SAl Viro struct dentry *parent = file->f_path.dentry; 28130b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 281476dda93cSYan, Zheng struct dentry *dentry; 28152b0143b5SDavid Howells struct inode *dir = d_inode(parent); 281676dda93cSYan, Zheng struct inode *inode; 281776dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 281876dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2819949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2820949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 2821949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2822949964c9SMarcos Paulo de Souza int subvol_namelen; 282376dda93cSYan, Zheng int err = 0; 2824949964c9SMarcos Paulo de Souza bool destroy_parent = false; 282576dda93cSYan, Zheng 2826949964c9SMarcos Paulo de Souza if (destroy_v2) { 2827949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2828949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2829949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2830325c50e3SJeff Mahoney 2831949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2832949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2833949964c9SMarcos Paulo de Souza goto out; 2834949964c9SMarcos Paulo de Souza } 283576dda93cSYan, Zheng 2836949964c9SMarcos Paulo de Souza /* 2837949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2838949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2839949964c9SMarcos Paulo de Souza */ 2840949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2841949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2842949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2843949964c9SMarcos Paulo de Souza 2844949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2845949964c9SMarcos Paulo de Souza if (err) 2846949964c9SMarcos Paulo de Souza goto out; 2847949964c9SMarcos Paulo de Souza } else { 2848949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 284976dda93cSYan, Zheng err = -EINVAL; 285076dda93cSYan, Zheng goto out; 285176dda93cSYan, Zheng } 285276dda93cSYan, Zheng 2853a561be71SAl Viro err = mnt_want_write_file(file); 285476dda93cSYan, Zheng if (err) 285576dda93cSYan, Zheng goto out; 285676dda93cSYan, Zheng 2857949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 2858949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 2859949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 2860949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 2861949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 2862949964c9SMarcos Paulo de Souza goto out_drop_write; 2863949964c9SMarcos Paulo de Souza } 2864949964c9SMarcos Paulo de Souza 2865949964c9SMarcos Paulo de Souza /* 2866949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 2867949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 2868949964c9SMarcos Paulo de Souza */ 2869949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 2870949964c9SMarcos Paulo de Souza 2871949964c9SMarcos Paulo de Souza /* 2872949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 2873949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 2874949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 2875949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 2876949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 2877949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 2878949964c9SMarcos Paulo de Souza */ 2879949964c9SMarcos Paulo de Souza dput(dentry); 2880949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 2881949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 2882949964c9SMarcos Paulo de Souza goto out_drop_write; 2883949964c9SMarcos Paulo de Souza } 2884949964c9SMarcos Paulo de Souza dir = d_inode(parent); 2885949964c9SMarcos Paulo de Souza 2886949964c9SMarcos Paulo de Souza /* 2887949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 2888949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 2889949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 2890949964c9SMarcos Paulo de Souza * new parent dentry. 2891949964c9SMarcos Paulo de Souza */ 2892949964c9SMarcos Paulo de Souza destroy_parent = true; 2893949964c9SMarcos Paulo de Souza 2894949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 2895949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 2896949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 2897949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 2898949964c9SMarcos Paulo de Souza goto free_parent; 2899949964c9SMarcos Paulo de Souza } 2900949964c9SMarcos Paulo de Souza /* subvol_name_ptr is already NULL termined */ 2901949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 2902949964c9SMarcos Paulo de Souza } 2903949964c9SMarcos Paulo de Souza } else { 2904949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 2905949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 2906949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 2907949964c9SMarcos Paulo de Souza 2908949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 2909949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 2910949964c9SMarcos Paulo de Souza 2911949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2912949964c9SMarcos Paulo de Souza if (err) 2913949964c9SMarcos Paulo de Souza goto out; 2914949964c9SMarcos Paulo de Souza } 2915949964c9SMarcos Paulo de Souza 2916949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 2917949964c9SMarcos Paulo de Souza 2918949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 2919949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 2920949964c9SMarcos Paulo de Souza err = -EINVAL; 2921949964c9SMarcos Paulo de Souza goto free_subvol_name; 2922949964c9SMarcos Paulo de Souza } 2923949964c9SMarcos Paulo de Souza 2924949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 2925949964c9SMarcos Paulo de Souza err = -ENOTDIR; 2926949964c9SMarcos Paulo de Souza goto free_subvol_name; 2927949964c9SMarcos Paulo de Souza } 2928521e0546SDavid Sterba 292900235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 293000235411SAl Viro if (err == -EINTR) 2931949964c9SMarcos Paulo de Souza goto free_subvol_name; 2932949964c9SMarcos Paulo de Souza dentry = lookup_one_len(subvol_name, parent, subvol_namelen); 293376dda93cSYan, Zheng if (IS_ERR(dentry)) { 293476dda93cSYan, Zheng err = PTR_ERR(dentry); 293576dda93cSYan, Zheng goto out_unlock_dir; 293676dda93cSYan, Zheng } 293776dda93cSYan, Zheng 29382b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 293976dda93cSYan, Zheng err = -ENOENT; 294076dda93cSYan, Zheng goto out_dput; 294176dda93cSYan, Zheng } 294276dda93cSYan, Zheng 29432b0143b5SDavid Howells inode = d_inode(dentry); 29444260f7c7SSage Weil dest = BTRFS_I(inode)->root; 29454260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 29464260f7c7SSage Weil /* 29474260f7c7SSage Weil * Regular user. Only allow this with a special mount 29484260f7c7SSage Weil * option, when the user has write+exec access to the 29494260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 29504260f7c7SSage Weil * allowed. 29514260f7c7SSage Weil * 29524260f7c7SSage Weil * Note that this is _not_ check that the subvol is 29534260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 29544260f7c7SSage Weil * otherwise be able to delete. 29554260f7c7SSage Weil * 29564260f7c7SSage Weil * Users who want to delete empty subvols should try 29574260f7c7SSage Weil * rmdir(2). 29584260f7c7SSage Weil */ 29594260f7c7SSage Weil err = -EPERM; 29600b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 29614260f7c7SSage Weil goto out_dput; 29624260f7c7SSage Weil 29634260f7c7SSage Weil /* 29644260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 29654260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 29664260f7c7SSage Weil * must be called on the dentry referencing the root 29674260f7c7SSage Weil * of the subvol, not a random directory contained 29684260f7c7SSage Weil * within it. 29694260f7c7SSage Weil */ 29704260f7c7SSage Weil err = -EINVAL; 29714260f7c7SSage Weil if (root == dest) 29724260f7c7SSage Weil goto out_dput; 29734260f7c7SSage Weil 297447291baaSChristian Brauner err = inode_permission(&init_user_ns, inode, 297547291baaSChristian Brauner MAY_WRITE | MAY_EXEC); 29764260f7c7SSage Weil if (err) 29774260f7c7SSage Weil goto out_dput; 29785c39da5bSMiao Xie } 29794260f7c7SSage Weil 29805c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 29814260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 29824260f7c7SSage Weil if (err) 29834260f7c7SSage Weil goto out_dput; 29844260f7c7SSage Weil 29854a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 298676dda93cSYan, Zheng err = -EINVAL; 298776dda93cSYan, Zheng goto out_dput; 298876dda93cSYan, Zheng } 298976dda93cSYan, Zheng 299064708539SJosef Bacik btrfs_inode_lock(inode, 0); 2991f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 299264708539SJosef Bacik btrfs_inode_unlock(inode, 0); 299346008d9dSAmir Goldstein if (!err) { 299446008d9dSAmir Goldstein fsnotify_rmdir(dir, dentry); 299576dda93cSYan, Zheng d_delete(dentry); 299646008d9dSAmir Goldstein } 2997fa6ac876SLiu Bo 299876dda93cSYan, Zheng out_dput: 299976dda93cSYan, Zheng dput(dentry); 300076dda93cSYan, Zheng out_unlock_dir: 300164708539SJosef Bacik btrfs_inode_unlock(dir, 0); 3002949964c9SMarcos Paulo de Souza free_subvol_name: 3003949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3004949964c9SMarcos Paulo de Souza free_parent: 3005949964c9SMarcos Paulo de Souza if (destroy_parent) 3006949964c9SMarcos Paulo de Souza dput(parent); 300700235411SAl Viro out_drop_write: 30082a79f17eSAl Viro mnt_drop_write_file(file); 300976dda93cSYan, Zheng out: 3010949964c9SMarcos Paulo de Souza kfree(vol_args2); 301176dda93cSYan, Zheng kfree(vol_args); 301276dda93cSYan, Zheng return err; 301376dda93cSYan, Zheng } 301476dda93cSYan, Zheng 30151e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3016f46b5a66SChristoph Hellwig { 3017496ad9aaSAl Viro struct inode *inode = file_inode(file); 3018f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 30191e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 3020c146afadSYan Zheng int ret; 3021c146afadSYan Zheng 302225122d15SIlya Dryomov ret = mnt_want_write_file(file); 302325122d15SIlya Dryomov if (ret) 302425122d15SIlya Dryomov return ret; 3025b83cc969SLi Zefan 302625122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 302725122d15SIlya Dryomov ret = -EROFS; 302825122d15SIlya Dryomov goto out; 30295ac00addSStefan Behrens } 3030f46b5a66SChristoph Hellwig 3031f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3032f46b5a66SChristoph Hellwig case S_IFDIR: 3033e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3034e441d54dSChris Mason ret = -EPERM; 3035e441d54dSChris Mason goto out; 3036e441d54dSChris Mason } 3037de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3038f46b5a66SChristoph Hellwig break; 3039f46b5a66SChristoph Hellwig case S_IFREG: 3040616d374eSAdam Borowski /* 3041616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3042616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3043616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3044616d374eSAdam Borowski */ 3045616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 304647291baaSChristian Brauner inode_permission(&init_user_ns, inode, MAY_WRITE)) { 3047616d374eSAdam Borowski ret = -EPERM; 3048e441d54dSChris Mason goto out; 3049e441d54dSChris Mason } 30501e701a32SChris Mason 30511e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 30521e701a32SChris Mason if (!range) { 30531e701a32SChris Mason ret = -ENOMEM; 30541e701a32SChris Mason goto out; 30551e701a32SChris Mason } 30561e701a32SChris Mason 30571e701a32SChris Mason if (argp) { 30581e701a32SChris Mason if (copy_from_user(range, argp, 30591e701a32SChris Mason sizeof(*range))) { 30601e701a32SChris Mason ret = -EFAULT; 30611e701a32SChris Mason kfree(range); 3062683be16eSDan Carpenter goto out; 30631e701a32SChris Mason } 30641e701a32SChris Mason /* compression requires us to start the IO */ 30651e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 30661e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 30671e701a32SChris Mason range->extent_thresh = (u32)-1; 30681e701a32SChris Mason } 30691e701a32SChris Mason } else { 30701e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 30711e701a32SChris Mason range->len = (u64)-1; 30721e701a32SChris Mason } 3073496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 30747c829b72SAnand Jain range, BTRFS_OLDEST_GENERATION, 0); 30754cb5300bSChris Mason if (ret > 0) 30764cb5300bSChris Mason ret = 0; 30771e701a32SChris Mason kfree(range); 3078f46b5a66SChristoph Hellwig break; 30798929ecfaSYan, Zheng default: 30808929ecfaSYan, Zheng ret = -EINVAL; 3081f46b5a66SChristoph Hellwig } 3082e441d54dSChris Mason out: 308325122d15SIlya Dryomov mnt_drop_write_file(file); 3084e441d54dSChris Mason return ret; 3085f46b5a66SChristoph Hellwig } 3086f46b5a66SChristoph Hellwig 30872ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3088f46b5a66SChristoph Hellwig { 3089f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3090f46b5a66SChristoph Hellwig int ret; 3091f46b5a66SChristoph Hellwig 3092e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3093e441d54dSChris Mason return -EPERM; 3094e441d54dSChris Mason 3095c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) 3096e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3097c9e9f97bSIlya Dryomov 3098dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3099c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3100c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3101c9e9f97bSIlya Dryomov goto out; 3102c9e9f97bSIlya Dryomov } 3103f46b5a66SChristoph Hellwig 31045516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 31052ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3106f46b5a66SChristoph Hellwig 310743d20761SAnand Jain if (!ret) 31080b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 310943d20761SAnand Jain 3110f46b5a66SChristoph Hellwig kfree(vol_args); 3111c9e9f97bSIlya Dryomov out: 3112c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3113f46b5a66SChristoph Hellwig return ret; 3114f46b5a66SChristoph Hellwig } 3115f46b5a66SChristoph Hellwig 31166b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3117f46b5a66SChristoph Hellwig { 31180b246afaSJeff Mahoney struct inode *inode = file_inode(file); 31190b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 31206b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 3121f46b5a66SChristoph Hellwig int ret; 3122f46b5a66SChristoph Hellwig 3123e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3124e441d54dSChris Mason return -EPERM; 3125e441d54dSChris Mason 3126da24927bSMiao Xie ret = mnt_want_write_file(file); 3127da24927bSMiao Xie if (ret) 3128da24927bSMiao Xie return ret; 3129c146afadSYan Zheng 3130dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3131c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3132c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3133c47ca32dSDan Carpenter goto err_drop; 3134c9e9f97bSIlya Dryomov } 3135f46b5a66SChristoph Hellwig 3136748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3137fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3138fd4e994bSOmar Sandoval goto out; 3139fd4e994bSOmar Sandoval } 3140f46b5a66SChristoph Hellwig 3141c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REMOVE)) { 3142183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3143183860f6SAnand Jain goto out; 3144183860f6SAnand Jain } 3145183860f6SAnand Jain 3146735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 31472ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, NULL, vol_args->devid); 31486b526ed7SAnand Jain } else { 31496b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 31502ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 31516b526ed7SAnand Jain } 3152c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3153183860f6SAnand Jain 31546b526ed7SAnand Jain if (!ret) { 3155735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 31560b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 31576b526ed7SAnand Jain vol_args->devid); 31586b526ed7SAnand Jain else 31590b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 31606b526ed7SAnand Jain vol_args->name); 31616b526ed7SAnand Jain } 3162183860f6SAnand Jain out: 3163183860f6SAnand Jain kfree(vol_args); 3164c47ca32dSDan Carpenter err_drop: 31654ac20c70SIlya Dryomov mnt_drop_write_file(file); 3166f46b5a66SChristoph Hellwig return ret; 3167f46b5a66SChristoph Hellwig } 3168f46b5a66SChristoph Hellwig 3169f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3170f46b5a66SChristoph Hellwig { 31710b246afaSJeff Mahoney struct inode *inode = file_inode(file); 31720b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3173f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3174f46b5a66SChristoph Hellwig int ret; 3175f46b5a66SChristoph Hellwig 3176f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3177f46b5a66SChristoph Hellwig return -EPERM; 3178f46b5a66SChristoph Hellwig 3179f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3180f46b5a66SChristoph Hellwig if (ret) 3181f46b5a66SChristoph Hellwig return ret; 3182f46b5a66SChristoph Hellwig 3183c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REMOVE)) { 3184f46b5a66SChristoph Hellwig ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 318558d7bbf8SDavid Sterba goto out_drop_write; 318658d7bbf8SDavid Sterba } 318758d7bbf8SDavid Sterba 318858d7bbf8SDavid Sterba vol_args = memdup_user(arg, sizeof(*vol_args)); 318958d7bbf8SDavid Sterba if (IS_ERR(vol_args)) { 319058d7bbf8SDavid Sterba ret = PTR_ERR(vol_args); 3191f46b5a66SChristoph Hellwig goto out; 3192f46b5a66SChristoph Hellwig } 3193f46b5a66SChristoph Hellwig 319458d7bbf8SDavid Sterba vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 31952ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 3196f46b5a66SChristoph Hellwig 3197f46b5a66SChristoph Hellwig if (!ret) 31980b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3199f46b5a66SChristoph Hellwig kfree(vol_args); 320058d7bbf8SDavid Sterba out: 3201c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 320258d7bbf8SDavid Sterba out_drop_write: 3203f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 320458d7bbf8SDavid Sterba 3205f46b5a66SChristoph Hellwig return ret; 3206f46b5a66SChristoph Hellwig } 3207f46b5a66SChristoph Hellwig 32082ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 32092ff7e61eSJeff Mahoney void __user *arg) 3210475f6387SJan Schmidt { 3211027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3212475f6387SJan Schmidt struct btrfs_device *device; 32130b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3214137c5418SJohannes Thumshirn u64 flags_in; 3215027ed2f0SLi Zefan int ret = 0; 3216475f6387SJan Schmidt 3217137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3218137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3219137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3220137c5418SJohannes Thumshirn 3221137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3222137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3223027ed2f0SLi Zefan 3224d03262c7SDavid Sterba rcu_read_lock(); 3225027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3226475f6387SJan Schmidt 3227d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3228027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3229027ed2f0SLi Zefan fi_args->max_id = device->devid; 3230475f6387SJan Schmidt } 3231d03262c7SDavid Sterba rcu_read_unlock(); 3232475f6387SJan Schmidt 3233de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3234bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3235bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3236bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 323780a773fbSDavid Sterba 3238137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3239137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3240137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3241137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3242137c5418SJohannes Thumshirn } 3243137c5418SJohannes Thumshirn 32440fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 32450fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 32460fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 32470fb408a5SJohannes Thumshirn } 32480fb408a5SJohannes Thumshirn 324949bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 325049bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 325149bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 325249bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 325349bac897SJohannes Thumshirn } 325449bac897SJohannes Thumshirn 3255027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3256027ed2f0SLi Zefan ret = -EFAULT; 3257475f6387SJan Schmidt 3258027ed2f0SLi Zefan kfree(fi_args); 3259027ed2f0SLi Zefan return ret; 3260475f6387SJan Schmidt } 3261475f6387SJan Schmidt 32622ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 32632ff7e61eSJeff Mahoney void __user *arg) 3264475f6387SJan Schmidt { 3265475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3266475f6387SJan Schmidt struct btrfs_device *dev; 3267475f6387SJan Schmidt int ret = 0; 3268475f6387SJan Schmidt char *s_uuid = NULL; 3269475f6387SJan Schmidt 3270475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3271475f6387SJan Schmidt if (IS_ERR(di_args)) 3272475f6387SJan Schmidt return PTR_ERR(di_args); 3273475f6387SJan Schmidt 3274dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3275475f6387SJan Schmidt s_uuid = di_args->uuid; 3276475f6387SJan Schmidt 3277c5593ca3SDavid Sterba rcu_read_lock(); 3278e4319cd9SAnand Jain dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid, 3279b2598edfSAnand Jain NULL); 3280475f6387SJan Schmidt 3281475f6387SJan Schmidt if (!dev) { 3282475f6387SJan Schmidt ret = -ENODEV; 3283475f6387SJan Schmidt goto out; 3284475f6387SJan Schmidt } 3285475f6387SJan Schmidt 3286475f6387SJan Schmidt di_args->devid = dev->devid; 32877cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 32887cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3289475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3290a27202fbSJim Meyering if (dev->name) { 3291672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3292672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3293a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3294a27202fbSJim Meyering } else { 329599ba55adSStefan Behrens di_args->path[0] = '\0'; 3296a27202fbSJim Meyering } 3297475f6387SJan Schmidt 3298475f6387SJan Schmidt out: 3299c5593ca3SDavid Sterba rcu_read_unlock(); 3300475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3301475f6387SJan Schmidt ret = -EFAULT; 3302475f6387SJan Schmidt 3303475f6387SJan Schmidt kfree(di_args); 3304475f6387SJan Schmidt return ret; 3305475f6387SJan Schmidt } 3306475f6387SJan Schmidt 33076ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 33086ef5ed0dSJosef Bacik { 3309496ad9aaSAl Viro struct inode *inode = file_inode(file); 33100b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 33116ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 33126ef5ed0dSJosef Bacik struct btrfs_root *new_root; 33136ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 33146ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 33152a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 33166ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 33176ef5ed0dSJosef Bacik u64 objectid = 0; 33186ef5ed0dSJosef Bacik u64 dir_id; 33193c04ce01SMiao Xie int ret; 33206ef5ed0dSJosef Bacik 33216ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 33226ef5ed0dSJosef Bacik return -EPERM; 33236ef5ed0dSJosef Bacik 33243c04ce01SMiao Xie ret = mnt_want_write_file(file); 33253c04ce01SMiao Xie if (ret) 33263c04ce01SMiao Xie return ret; 33273c04ce01SMiao Xie 33283c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 33293c04ce01SMiao Xie ret = -EFAULT; 33303c04ce01SMiao Xie goto out; 33313c04ce01SMiao Xie } 33326ef5ed0dSJosef Bacik 33336ef5ed0dSJosef Bacik if (!objectid) 33341cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 33356ef5ed0dSJosef Bacik 333656e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 33373c04ce01SMiao Xie if (IS_ERR(new_root)) { 33383c04ce01SMiao Xie ret = PTR_ERR(new_root); 33393c04ce01SMiao Xie goto out; 33403c04ce01SMiao Xie } 33412a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 33422a2b5d62SJosef Bacik ret = -ENOENT; 33432a2b5d62SJosef Bacik goto out_free; 33442a2b5d62SJosef Bacik } 33456ef5ed0dSJosef Bacik 33466ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 33473c04ce01SMiao Xie if (!path) { 33483c04ce01SMiao Xie ret = -ENOMEM; 33492a2b5d62SJosef Bacik goto out_free; 33503c04ce01SMiao Xie } 33516ef5ed0dSJosef Bacik 33526ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 335398d5dc13STsutomu Itoh if (IS_ERR(trans)) { 33543c04ce01SMiao Xie ret = PTR_ERR(trans); 33552a2b5d62SJosef Bacik goto out_free; 33566ef5ed0dSJosef Bacik } 33576ef5ed0dSJosef Bacik 33580b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 33590b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 33606ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3361cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 33622a2b5d62SJosef Bacik btrfs_release_path(path); 33633a45bb20SJeff Mahoney btrfs_end_transaction(trans); 33640b246afaSJeff Mahoney btrfs_err(fs_info, 33655d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 33663c04ce01SMiao Xie ret = -ENOENT; 33672a2b5d62SJosef Bacik goto out_free; 33686ef5ed0dSJosef Bacik } 33696ef5ed0dSJosef Bacik 33706ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 33716ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 33726ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 33732a2b5d62SJosef Bacik btrfs_release_path(path); 33746ef5ed0dSJosef Bacik 33750b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 33763a45bb20SJeff Mahoney btrfs_end_transaction(trans); 33772a2b5d62SJosef Bacik out_free: 337800246528SJosef Bacik btrfs_put_root(new_root); 33792a2b5d62SJosef Bacik btrfs_free_path(path); 33803c04ce01SMiao Xie out: 33813c04ce01SMiao Xie mnt_drop_write_file(file); 33823c04ce01SMiao Xie return ret; 33836ef5ed0dSJosef Bacik } 33846ef5ed0dSJosef Bacik 3385c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3386bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3387bf5fc093SJosef Bacik { 338832da5386SDavid Sterba struct btrfs_block_group *block_group; 3389bf5fc093SJosef Bacik 3390bf5fc093SJosef Bacik space->total_bytes = 0; 3391bf5fc093SJosef Bacik space->used_bytes = 0; 3392bf5fc093SJosef Bacik space->flags = 0; 3393bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3394bf5fc093SJosef Bacik space->flags = block_group->flags; 3395b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3396bf38be65SDavid Sterba space->used_bytes += block_group->used; 3397bf5fc093SJosef Bacik } 3398bf5fc093SJosef Bacik } 3399bf5fc093SJosef Bacik 34002ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 34012ff7e61eSJeff Mahoney void __user *arg) 34021406e432SJosef Bacik { 34031406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 34041406e432SJosef Bacik struct btrfs_ioctl_space_info space; 34051406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 34067fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 340713f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 34081406e432SJosef Bacik struct btrfs_space_info *info; 3409315d8e98SColin Ian King static const u64 types[] = { 3410315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3411bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3412bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3413315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3414315d8e98SColin Ian King }; 3415bf5fc093SJosef Bacik int num_types = 4; 34167fde62bfSChris Mason int alloc_size; 34171406e432SJosef Bacik int ret = 0; 341851788b1bSDan Rosenberg u64 slot_count = 0; 3419bf5fc093SJosef Bacik int i, c; 34201406e432SJosef Bacik 34211406e432SJosef Bacik if (copy_from_user(&space_args, 34221406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 34231406e432SJosef Bacik sizeof(space_args))) 34241406e432SJosef Bacik return -EFAULT; 34251406e432SJosef Bacik 3426bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3427bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3428bf5fc093SJosef Bacik 3429bf5fc093SJosef Bacik info = NULL; 343072804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3431bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3432bf5fc093SJosef Bacik info = tmp; 3433bf5fc093SJosef Bacik break; 3434bf5fc093SJosef Bacik } 3435bf5fc093SJosef Bacik } 34361406e432SJosef Bacik 3437bf5fc093SJosef Bacik if (!info) 3438bf5fc093SJosef Bacik continue; 3439bf5fc093SJosef Bacik 3440bf5fc093SJosef Bacik down_read(&info->groups_sem); 3441bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3442bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3443bf5fc093SJosef Bacik slot_count++; 3444bf5fc093SJosef Bacik } 3445bf5fc093SJosef Bacik up_read(&info->groups_sem); 3446bf5fc093SJosef Bacik } 3447bf5fc093SJosef Bacik 344836523e95SDavid Sterba /* 344936523e95SDavid Sterba * Global block reserve, exported as a space_info 345036523e95SDavid Sterba */ 345136523e95SDavid Sterba slot_count++; 345236523e95SDavid Sterba 34537fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 34547fde62bfSChris Mason if (space_args.space_slots == 0) { 34557fde62bfSChris Mason space_args.total_spaces = slot_count; 34567fde62bfSChris Mason goto out; 34577fde62bfSChris Mason } 3458bf5fc093SJosef Bacik 345951788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3460bf5fc093SJosef Bacik 34617fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3462bf5fc093SJosef Bacik 34637fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 34647fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 34657fde62bfSChris Mason */ 346609cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 34677fde62bfSChris Mason return -ENOMEM; 34687fde62bfSChris Mason 34697fde62bfSChris Mason space_args.total_spaces = 0; 34708d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 34717fde62bfSChris Mason if (!dest) 34727fde62bfSChris Mason return -ENOMEM; 34737fde62bfSChris Mason dest_orig = dest; 34747fde62bfSChris Mason 34757fde62bfSChris Mason /* now we have a buffer to copy into */ 3476bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3477bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3478bf5fc093SJosef Bacik 347951788b1bSDan Rosenberg if (!slot_count) 348051788b1bSDan Rosenberg break; 348151788b1bSDan Rosenberg 3482bf5fc093SJosef Bacik info = NULL; 348372804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3484bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3485bf5fc093SJosef Bacik info = tmp; 34867fde62bfSChris Mason break; 3487bf5fc093SJosef Bacik } 3488bf5fc093SJosef Bacik } 34897fde62bfSChris Mason 3490bf5fc093SJosef Bacik if (!info) 3491bf5fc093SJosef Bacik continue; 3492bf5fc093SJosef Bacik down_read(&info->groups_sem); 3493bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3494bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3495c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3496c065f5b1SSu Yue &space); 34977fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 34981406e432SJosef Bacik dest++; 34991406e432SJosef Bacik space_args.total_spaces++; 350051788b1bSDan Rosenberg slot_count--; 35011406e432SJosef Bacik } 350251788b1bSDan Rosenberg if (!slot_count) 350351788b1bSDan Rosenberg break; 3504bf5fc093SJosef Bacik } 3505bf5fc093SJosef Bacik up_read(&info->groups_sem); 3506bf5fc093SJosef Bacik } 35071406e432SJosef Bacik 350836523e95SDavid Sterba /* 350936523e95SDavid Sterba * Add global block reserve 351036523e95SDavid Sterba */ 351136523e95SDavid Sterba if (slot_count) { 35120b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 351336523e95SDavid Sterba 351436523e95SDavid Sterba spin_lock(&block_rsv->lock); 351536523e95SDavid Sterba space.total_bytes = block_rsv->size; 351636523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 351736523e95SDavid Sterba spin_unlock(&block_rsv->lock); 351836523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 351936523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 352036523e95SDavid Sterba space_args.total_spaces++; 352136523e95SDavid Sterba } 352236523e95SDavid Sterba 35232eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 35247fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 35257fde62bfSChris Mason 35267fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 35277fde62bfSChris Mason ret = -EFAULT; 35287fde62bfSChris Mason 35297fde62bfSChris Mason kfree(dest_orig); 35307fde62bfSChris Mason out: 35317fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 35321406e432SJosef Bacik ret = -EFAULT; 35331406e432SJosef Bacik 35341406e432SJosef Bacik return ret; 35351406e432SJosef Bacik } 35361406e432SJosef Bacik 35379a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 35389a8c28beSMiao Xie void __user *argp) 353946204592SSage Weil { 354046204592SSage Weil struct btrfs_trans_handle *trans; 354146204592SSage Weil u64 transid; 3542db5b493aSTsutomu Itoh int ret; 354346204592SSage Weil 3544d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3545ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3546ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 354798d5dc13STsutomu Itoh return PTR_ERR(trans); 3548ff7c1d33SMiao Xie 3549ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3550ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3551ff7c1d33SMiao Xie goto out; 3552ff7c1d33SMiao Xie } 355346204592SSage Weil transid = trans->transid; 35543a45bb20SJeff Mahoney ret = btrfs_commit_transaction_async(trans, 0); 35558b2b2d3cSTsutomu Itoh if (ret) { 35563a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3557db5b493aSTsutomu Itoh return ret; 35588b2b2d3cSTsutomu Itoh } 3559ff7c1d33SMiao Xie out: 356046204592SSage Weil if (argp) 356146204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 356246204592SSage Weil return -EFAULT; 356346204592SSage Weil return 0; 356446204592SSage Weil } 356546204592SSage Weil 35662ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 35679a8c28beSMiao Xie void __user *argp) 356846204592SSage Weil { 356946204592SSage Weil u64 transid; 357046204592SSage Weil 357146204592SSage Weil if (argp) { 357246204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 357346204592SSage Weil return -EFAULT; 357446204592SSage Weil } else { 357546204592SSage Weil transid = 0; /* current trans */ 357646204592SSage Weil } 35772ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 357846204592SSage Weil } 357946204592SSage Weil 3580b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3581475f6387SJan Schmidt { 35820b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3583475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3584b8e95489SMiao Xie int ret; 3585475f6387SJan Schmidt 3586475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3587475f6387SJan Schmidt return -EPERM; 3588475f6387SJan Schmidt 3589475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3590475f6387SJan Schmidt if (IS_ERR(sa)) 3591475f6387SJan Schmidt return PTR_ERR(sa); 3592475f6387SJan Schmidt 3593b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3594b8e95489SMiao Xie ret = mnt_want_write_file(file); 3595b8e95489SMiao Xie if (ret) 3596b8e95489SMiao Xie goto out; 3597b8e95489SMiao Xie } 3598b8e95489SMiao Xie 35990b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 360063a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 360163a212abSStefan Behrens 0); 3602475f6387SJan Schmidt 36035afe6ce7SFilipe Manana /* 36045afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 36055afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 36065afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 36075afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 36085afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 36095afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 36105afe6ce7SFilipe Manana * previously (btrfs-progs does this). 36115afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 36125afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 36135afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 36145afe6ce7SFilipe Manana */ 36155afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3616475f6387SJan Schmidt ret = -EFAULT; 3617475f6387SJan Schmidt 3618b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3619b8e95489SMiao Xie mnt_drop_write_file(file); 3620b8e95489SMiao Xie out: 3621475f6387SJan Schmidt kfree(sa); 3622475f6387SJan Schmidt return ret; 3623475f6387SJan Schmidt } 3624475f6387SJan Schmidt 36252ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3626475f6387SJan Schmidt { 3627475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3628475f6387SJan Schmidt return -EPERM; 3629475f6387SJan Schmidt 36302ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3631475f6387SJan Schmidt } 3632475f6387SJan Schmidt 36332ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3634475f6387SJan Schmidt void __user *arg) 3635475f6387SJan Schmidt { 3636475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3637475f6387SJan Schmidt int ret; 3638475f6387SJan Schmidt 3639475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3640475f6387SJan Schmidt return -EPERM; 3641475f6387SJan Schmidt 3642475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3643475f6387SJan Schmidt if (IS_ERR(sa)) 3644475f6387SJan Schmidt return PTR_ERR(sa); 3645475f6387SJan Schmidt 36462ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3647475f6387SJan Schmidt 36484fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3649475f6387SJan Schmidt ret = -EFAULT; 3650475f6387SJan Schmidt 3651475f6387SJan Schmidt kfree(sa); 3652475f6387SJan Schmidt return ret; 3653475f6387SJan Schmidt } 3654475f6387SJan Schmidt 36552ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3656b27f7c0cSDavid Sterba void __user *arg) 3657c11d2c23SStefan Behrens { 3658c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3659c11d2c23SStefan Behrens int ret; 3660c11d2c23SStefan Behrens 3661c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3662c11d2c23SStefan Behrens if (IS_ERR(sa)) 3663c11d2c23SStefan Behrens return PTR_ERR(sa); 3664c11d2c23SStefan Behrens 3665b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3666b27f7c0cSDavid Sterba kfree(sa); 3667b27f7c0cSDavid Sterba return -EPERM; 3668b27f7c0cSDavid Sterba } 3669b27f7c0cSDavid Sterba 36702ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3671c11d2c23SStefan Behrens 3672eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3673c11d2c23SStefan Behrens ret = -EFAULT; 3674c11d2c23SStefan Behrens 3675c11d2c23SStefan Behrens kfree(sa); 3676c11d2c23SStefan Behrens return ret; 3677c11d2c23SStefan Behrens } 3678c11d2c23SStefan Behrens 36792ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 36802ff7e61eSJeff Mahoney void __user *arg) 36813f6bcfbdSStefan Behrens { 36823f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 36833f6bcfbdSStefan Behrens int ret; 36843f6bcfbdSStefan Behrens 36853f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 36863f6bcfbdSStefan Behrens return -EPERM; 36873f6bcfbdSStefan Behrens 36883f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 36893f6bcfbdSStefan Behrens if (IS_ERR(p)) 36903f6bcfbdSStefan Behrens return PTR_ERR(p); 36913f6bcfbdSStefan Behrens 36923f6bcfbdSStefan Behrens switch (p->cmd) { 36933f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3694bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3695adfa97cbSIlya Dryomov ret = -EROFS; 3696adfa97cbSIlya Dryomov goto out; 3697adfa97cbSIlya Dryomov } 3698c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 3699e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 37003f6bcfbdSStefan Behrens } else { 37012ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3702c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 37033f6bcfbdSStefan Behrens } 37043f6bcfbdSStefan Behrens break; 37053f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 37060b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 37073f6bcfbdSStefan Behrens ret = 0; 37083f6bcfbdSStefan Behrens break; 37093f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 371017d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 371197282031SAnand Jain ret = 0; 37123f6bcfbdSStefan Behrens break; 37133f6bcfbdSStefan Behrens default: 37143f6bcfbdSStefan Behrens ret = -EINVAL; 37153f6bcfbdSStefan Behrens break; 37163f6bcfbdSStefan Behrens } 37173f6bcfbdSStefan Behrens 3718d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 37193f6bcfbdSStefan Behrens ret = -EFAULT; 3720adfa97cbSIlya Dryomov out: 37213f6bcfbdSStefan Behrens kfree(p); 37223f6bcfbdSStefan Behrens return ret; 37233f6bcfbdSStefan Behrens } 37243f6bcfbdSStefan Behrens 3725d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3726d7728c96SJan Schmidt { 3727d7728c96SJan Schmidt int ret = 0; 3728d7728c96SJan Schmidt int i; 3729740c3d22SChris Mason u64 rel_ptr; 3730d7728c96SJan Schmidt int size; 3731806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3732d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3733d7728c96SJan Schmidt struct btrfs_path *path; 3734d7728c96SJan Schmidt 373582b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3736d7728c96SJan Schmidt return -EPERM; 3737d7728c96SJan Schmidt 3738d7728c96SJan Schmidt path = btrfs_alloc_path(); 3739d7728c96SJan Schmidt if (!path) { 3740d7728c96SJan Schmidt ret = -ENOMEM; 3741d7728c96SJan Schmidt goto out; 3742d7728c96SJan Schmidt } 3743d7728c96SJan Schmidt 3744d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3745d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3746d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3747d7728c96SJan Schmidt ipa = NULL; 3748d7728c96SJan Schmidt goto out; 3749d7728c96SJan Schmidt } 3750d7728c96SJan Schmidt 3751d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3752d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3753d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3754d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3755d7728c96SJan Schmidt ipath = NULL; 3756d7728c96SJan Schmidt goto out; 3757d7728c96SJan Schmidt } 3758d7728c96SJan Schmidt 3759d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3760d7728c96SJan Schmidt if (ret < 0) 3761d7728c96SJan Schmidt goto out; 3762d7728c96SJan Schmidt 3763d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3764745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3765745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3766740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3767d7728c96SJan Schmidt } 3768d7728c96SJan Schmidt 3769718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3770718dc5faSOmar Sandoval ipath->fspath, size); 3771d7728c96SJan Schmidt if (ret) { 3772d7728c96SJan Schmidt ret = -EFAULT; 3773d7728c96SJan Schmidt goto out; 3774d7728c96SJan Schmidt } 3775d7728c96SJan Schmidt 3776d7728c96SJan Schmidt out: 3777d7728c96SJan Schmidt btrfs_free_path(path); 3778d7728c96SJan Schmidt free_ipath(ipath); 3779d7728c96SJan Schmidt kfree(ipa); 3780d7728c96SJan Schmidt 3781d7728c96SJan Schmidt return ret; 3782d7728c96SJan Schmidt } 3783d7728c96SJan Schmidt 3784d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3785d7728c96SJan Schmidt { 3786d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3787d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3788d7728c96SJan Schmidt 3789d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3790d7728c96SJan Schmidt inodes->bytes_left -= c; 3791d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3792d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3793d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3794d7728c96SJan Schmidt inodes->elem_cnt += 3; 3795d7728c96SJan Schmidt } else { 3796d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3797d7728c96SJan Schmidt inodes->bytes_left = 0; 3798d7728c96SJan Schmidt inodes->elem_missed += 3; 3799d7728c96SJan Schmidt } 3800d7728c96SJan Schmidt 3801d7728c96SJan Schmidt return 0; 3802d7728c96SJan Schmidt } 3803d7728c96SJan Schmidt 38042ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3805d24a67b2SZygo Blaxell void __user *arg, int version) 3806d7728c96SJan Schmidt { 3807d7728c96SJan Schmidt int ret = 0; 3808d7728c96SJan Schmidt int size; 3809d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3810d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3811d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3812d24a67b2SZygo Blaxell bool ignore_offset; 3813d7728c96SJan Schmidt 3814d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3815d7728c96SJan Schmidt return -EPERM; 3816d7728c96SJan Schmidt 3817d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 38187b9ea627SShailendra Verma if (IS_ERR(loi)) 38197b9ea627SShailendra Verma return PTR_ERR(loi); 3820d7728c96SJan Schmidt 3821d24a67b2SZygo Blaxell if (version == 1) { 3822d24a67b2SZygo Blaxell ignore_offset = false; 3823b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 3824d24a67b2SZygo Blaxell } else { 3825d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 3826d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 3827d24a67b2SZygo Blaxell ret = -EINVAL; 3828d24a67b2SZygo Blaxell goto out_loi; 3829d24a67b2SZygo Blaxell } 3830d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 3831d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 3832d24a67b2SZygo Blaxell ret = -EINVAL; 3833d24a67b2SZygo Blaxell goto out_loi; 3834d24a67b2SZygo Blaxell } 3835d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 3836b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 3837d24a67b2SZygo Blaxell } 3838d24a67b2SZygo Blaxell 3839d7728c96SJan Schmidt path = btrfs_alloc_path(); 3840d7728c96SJan Schmidt if (!path) { 3841d7728c96SJan Schmidt ret = -ENOMEM; 3842d7728c96SJan Schmidt goto out; 3843d7728c96SJan Schmidt } 3844d7728c96SJan Schmidt 3845d7728c96SJan Schmidt inodes = init_data_container(size); 3846d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3847d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3848d7728c96SJan Schmidt inodes = NULL; 3849d7728c96SJan Schmidt goto out; 3850d7728c96SJan Schmidt } 3851d7728c96SJan Schmidt 38522ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 3853d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 3854df031f07SLiu Bo if (ret == -EINVAL) 3855d7728c96SJan Schmidt ret = -ENOENT; 3856d7728c96SJan Schmidt if (ret < 0) 3857d7728c96SJan Schmidt goto out; 3858d7728c96SJan Schmidt 3859718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 3860718dc5faSOmar Sandoval size); 3861d7728c96SJan Schmidt if (ret) 3862d7728c96SJan Schmidt ret = -EFAULT; 3863d7728c96SJan Schmidt 3864d7728c96SJan Schmidt out: 3865d7728c96SJan Schmidt btrfs_free_path(path); 3866f54de068SDavid Sterba kvfree(inodes); 3867d24a67b2SZygo Blaxell out_loi: 3868d7728c96SJan Schmidt kfree(loi); 3869d7728c96SJan Schmidt 3870d7728c96SJan Schmidt return ret; 3871d7728c96SJan Schmidt } 3872d7728c96SJan Schmidt 3873008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 3874c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3875c9e9f97bSIlya Dryomov { 3876c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3877c9e9f97bSIlya Dryomov 3878c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3879c9e9f97bSIlya Dryomov 38803009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 3881837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3882837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3883837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3884a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3885a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3886837d5b6eSIlya Dryomov 3887c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3888c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3889c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 389019a39dceSIlya Dryomov 389119a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 389219a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 389319a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 3894c9e9f97bSIlya Dryomov } 3895c9e9f97bSIlya Dryomov 38969ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3897c9e9f97bSIlya Dryomov { 3898496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3899c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3900c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3901c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3902ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 3903c9e9f97bSIlya Dryomov int ret; 3904c9e9f97bSIlya Dryomov 3905c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3906c9e9f97bSIlya Dryomov return -EPERM; 3907c9e9f97bSIlya Dryomov 3908e54bfa31SLiu Bo ret = mnt_want_write_file(file); 39099ba1f6e4SLiu Bo if (ret) 39109ba1f6e4SLiu Bo return ret; 39119ba1f6e4SLiu Bo 3912ed0fb78fSIlya Dryomov again: 3913c3e1f96cSGoldwyn Rodrigues if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 3914c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3915ed0fb78fSIlya Dryomov need_unlock = true; 3916ed0fb78fSIlya Dryomov goto locked; 3917ed0fb78fSIlya Dryomov } 3918ed0fb78fSIlya Dryomov 3919ed0fb78fSIlya Dryomov /* 392001327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 3921ed0fb78fSIlya Dryomov * (1) some other op is running 3922ed0fb78fSIlya Dryomov * (2) balance is running 3923ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 3924ed0fb78fSIlya Dryomov */ 3925ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3926ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3927ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 39283009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 3929ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3930dccdb07bSDavid Sterba /* 3931dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 3932dccdb07bSDavid Sterba * we'll reexamine the status again. 3933dccdb07bSDavid Sterba */ 3934ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3935ed0fb78fSIlya Dryomov 3936ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 39373009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 3938ed0fb78fSIlya Dryomov /* this is (3) */ 3939ed0fb78fSIlya Dryomov need_unlock = false; 3940ed0fb78fSIlya Dryomov goto locked; 3941ed0fb78fSIlya Dryomov } 3942ed0fb78fSIlya Dryomov 3943ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3944ed0fb78fSIlya Dryomov goto again; 3945ed0fb78fSIlya Dryomov } else { 3946ed0fb78fSIlya Dryomov /* this is (2) */ 3947ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3948ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 3949ed0fb78fSIlya Dryomov goto out; 3950ed0fb78fSIlya Dryomov } 3951ed0fb78fSIlya Dryomov } else { 3952ed0fb78fSIlya Dryomov /* this is (1) */ 3953ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3954e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3955ed0fb78fSIlya Dryomov goto out; 3956ed0fb78fSIlya Dryomov } 3957ed0fb78fSIlya Dryomov 3958ed0fb78fSIlya Dryomov locked: 3959c9e9f97bSIlya Dryomov 3960c9e9f97bSIlya Dryomov if (arg) { 3961c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 3962c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 3963c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 3964ed0fb78fSIlya Dryomov goto out_unlock; 3965c9e9f97bSIlya Dryomov } 3966de322263SIlya Dryomov 3967de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3968de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3969de322263SIlya Dryomov ret = -ENOTCONN; 3970de322263SIlya Dryomov goto out_bargs; 3971de322263SIlya Dryomov } 3972de322263SIlya Dryomov 3973de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3974de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3975de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3976de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3977de322263SIlya Dryomov 3978de322263SIlya Dryomov goto do_balance; 3979de322263SIlya Dryomov } 3980c9e9f97bSIlya Dryomov } else { 3981c9e9f97bSIlya Dryomov bargs = NULL; 3982c9e9f97bSIlya Dryomov } 3983c9e9f97bSIlya Dryomov 3984ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3985837d5b6eSIlya Dryomov ret = -EINPROGRESS; 3986837d5b6eSIlya Dryomov goto out_bargs; 3987837d5b6eSIlya Dryomov } 3988837d5b6eSIlya Dryomov 39898d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 3990c9e9f97bSIlya Dryomov if (!bctl) { 3991c9e9f97bSIlya Dryomov ret = -ENOMEM; 3992c9e9f97bSIlya Dryomov goto out_bargs; 3993c9e9f97bSIlya Dryomov } 3994c9e9f97bSIlya Dryomov 3995c9e9f97bSIlya Dryomov if (arg) { 3996c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 3997c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 3998c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 3999c9e9f97bSIlya Dryomov 4000c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4001f43ffb60SIlya Dryomov } else { 4002f43ffb60SIlya Dryomov /* balance everything - no filters */ 4003f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4004c9e9f97bSIlya Dryomov } 4005c9e9f97bSIlya Dryomov 40068eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 40078eb93459SDavid Sterba ret = -EINVAL; 40080f89abf5SChristian Engelmayer goto out_bctl; 40098eb93459SDavid Sterba } 40108eb93459SDavid Sterba 4011de322263SIlya Dryomov do_balance: 4012c9e9f97bSIlya Dryomov /* 4013c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 4014c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 4015c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 4016c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 4017c9e9f97bSIlya Dryomov */ 4018ed0fb78fSIlya Dryomov need_unlock = false; 4019ed0fb78fSIlya Dryomov 40206fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 40210f89abf5SChristian Engelmayer bctl = NULL; 4022ed0fb78fSIlya Dryomov 4023d00c2d9cSFilipe Manana if ((ret == 0 || ret == -ECANCELED) && arg) { 4024c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4025c9e9f97bSIlya Dryomov ret = -EFAULT; 4026c9e9f97bSIlya Dryomov } 4027c9e9f97bSIlya Dryomov 40280f89abf5SChristian Engelmayer out_bctl: 40290f89abf5SChristian Engelmayer kfree(bctl); 4030c9e9f97bSIlya Dryomov out_bargs: 4031c9e9f97bSIlya Dryomov kfree(bargs); 4032ed0fb78fSIlya Dryomov out_unlock: 4033c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4034ed0fb78fSIlya Dryomov if (need_unlock) 4035c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 4036ed0fb78fSIlya Dryomov out: 4037e54bfa31SLiu Bo mnt_drop_write_file(file); 4038c9e9f97bSIlya Dryomov return ret; 4039c9e9f97bSIlya Dryomov } 4040c9e9f97bSIlya Dryomov 40412ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4042837d5b6eSIlya Dryomov { 4043837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4044837d5b6eSIlya Dryomov return -EPERM; 4045837d5b6eSIlya Dryomov 4046837d5b6eSIlya Dryomov switch (cmd) { 4047837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 40480b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4049a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 40500b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4051837d5b6eSIlya Dryomov } 4052837d5b6eSIlya Dryomov 4053837d5b6eSIlya Dryomov return -EINVAL; 4054837d5b6eSIlya Dryomov } 4055837d5b6eSIlya Dryomov 40562ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 405719a39dceSIlya Dryomov void __user *arg) 405819a39dceSIlya Dryomov { 405919a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 406019a39dceSIlya Dryomov int ret = 0; 406119a39dceSIlya Dryomov 406219a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 406319a39dceSIlya Dryomov return -EPERM; 406419a39dceSIlya Dryomov 406519a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 406619a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 406719a39dceSIlya Dryomov ret = -ENOTCONN; 406819a39dceSIlya Dryomov goto out; 406919a39dceSIlya Dryomov } 407019a39dceSIlya Dryomov 40718d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 407219a39dceSIlya Dryomov if (!bargs) { 407319a39dceSIlya Dryomov ret = -ENOMEM; 407419a39dceSIlya Dryomov goto out; 407519a39dceSIlya Dryomov } 407619a39dceSIlya Dryomov 4077008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 407819a39dceSIlya Dryomov 407919a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 408019a39dceSIlya Dryomov ret = -EFAULT; 408119a39dceSIlya Dryomov 408219a39dceSIlya Dryomov kfree(bargs); 408319a39dceSIlya Dryomov out: 408419a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 408519a39dceSIlya Dryomov return ret; 408619a39dceSIlya Dryomov } 408719a39dceSIlya Dryomov 4088905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 40895d13a37bSArne Jansen { 40900b246afaSJeff Mahoney struct inode *inode = file_inode(file); 40910b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 40925d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 40935d13a37bSArne Jansen int ret; 40945d13a37bSArne Jansen 40955d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 40965d13a37bSArne Jansen return -EPERM; 40975d13a37bSArne Jansen 4098905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4099905b0ddaSMiao Xie if (ret) 4100905b0ddaSMiao Xie return ret; 41015d13a37bSArne Jansen 41025d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4103905b0ddaSMiao Xie if (IS_ERR(sa)) { 4104905b0ddaSMiao Xie ret = PTR_ERR(sa); 4105905b0ddaSMiao Xie goto drop_write; 4106905b0ddaSMiao Xie } 41075d13a37bSArne Jansen 41080b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 41095d13a37bSArne Jansen 41105d13a37bSArne Jansen switch (sa->cmd) { 41115d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4112340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 41135d13a37bSArne Jansen break; 41145d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4115340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 41165d13a37bSArne Jansen break; 41175d13a37bSArne Jansen default: 41185d13a37bSArne Jansen ret = -EINVAL; 41195d13a37bSArne Jansen break; 41205d13a37bSArne Jansen } 41215d13a37bSArne Jansen 41225d13a37bSArne Jansen kfree(sa); 41230b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4124905b0ddaSMiao Xie drop_write: 4125905b0ddaSMiao Xie mnt_drop_write_file(file); 41265d13a37bSArne Jansen return ret; 41275d13a37bSArne Jansen } 41285d13a37bSArne Jansen 4129905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 41305d13a37bSArne Jansen { 41310b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41320b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41330b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 41345d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 41355d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41365d13a37bSArne Jansen int ret; 41375d13a37bSArne Jansen int err; 41385d13a37bSArne Jansen 41395d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41405d13a37bSArne Jansen return -EPERM; 41415d13a37bSArne Jansen 4142905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4143905b0ddaSMiao Xie if (ret) 4144905b0ddaSMiao Xie return ret; 41455d13a37bSArne Jansen 41465d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4147905b0ddaSMiao Xie if (IS_ERR(sa)) { 4148905b0ddaSMiao Xie ret = PTR_ERR(sa); 4149905b0ddaSMiao Xie goto drop_write; 4150905b0ddaSMiao Xie } 41515d13a37bSArne Jansen 41525d13a37bSArne Jansen trans = btrfs_join_transaction(root); 41535d13a37bSArne Jansen if (IS_ERR(trans)) { 41545d13a37bSArne Jansen ret = PTR_ERR(trans); 41555d13a37bSArne Jansen goto out; 41565d13a37bSArne Jansen } 41575d13a37bSArne Jansen 41585d13a37bSArne Jansen if (sa->assign) { 41599f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 41605d13a37bSArne Jansen } else { 416139616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 41625d13a37bSArne Jansen } 41635d13a37bSArne Jansen 4164e082f563SQu Wenruo /* update qgroup status and info */ 4165280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4166e082f563SQu Wenruo if (err < 0) 41670b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4168ad8403dfSAnand Jain "failed to update qgroup status and info"); 41693a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 41705d13a37bSArne Jansen if (err && !ret) 41715d13a37bSArne Jansen ret = err; 41725d13a37bSArne Jansen 41735d13a37bSArne Jansen out: 41745d13a37bSArne Jansen kfree(sa); 4175905b0ddaSMiao Xie drop_write: 4176905b0ddaSMiao Xie mnt_drop_write_file(file); 41775d13a37bSArne Jansen return ret; 41785d13a37bSArne Jansen } 41795d13a37bSArne Jansen 4180905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 41815d13a37bSArne Jansen { 41820b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41830b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 41845d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 41855d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41865d13a37bSArne Jansen int ret; 41875d13a37bSArne Jansen int err; 41885d13a37bSArne Jansen 41895d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41905d13a37bSArne Jansen return -EPERM; 41915d13a37bSArne Jansen 4192905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4193905b0ddaSMiao Xie if (ret) 4194905b0ddaSMiao Xie return ret; 41955d13a37bSArne Jansen 41965d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4197905b0ddaSMiao Xie if (IS_ERR(sa)) { 4198905b0ddaSMiao Xie ret = PTR_ERR(sa); 4199905b0ddaSMiao Xie goto drop_write; 4200905b0ddaSMiao Xie } 42015d13a37bSArne Jansen 4202d86e56cfSMiao Xie if (!sa->qgroupid) { 4203d86e56cfSMiao Xie ret = -EINVAL; 4204d86e56cfSMiao Xie goto out; 4205d86e56cfSMiao Xie } 4206d86e56cfSMiao Xie 42075d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42085d13a37bSArne Jansen if (IS_ERR(trans)) { 42095d13a37bSArne Jansen ret = PTR_ERR(trans); 42105d13a37bSArne Jansen goto out; 42115d13a37bSArne Jansen } 42125d13a37bSArne Jansen 42135d13a37bSArne Jansen if (sa->create) { 421449a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 42155d13a37bSArne Jansen } else { 42163efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 42175d13a37bSArne Jansen } 42185d13a37bSArne Jansen 42193a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 42205d13a37bSArne Jansen if (err && !ret) 42215d13a37bSArne Jansen ret = err; 42225d13a37bSArne Jansen 42235d13a37bSArne Jansen out: 42245d13a37bSArne Jansen kfree(sa); 4225905b0ddaSMiao Xie drop_write: 4226905b0ddaSMiao Xie mnt_drop_write_file(file); 42275d13a37bSArne Jansen return ret; 42285d13a37bSArne Jansen } 42295d13a37bSArne Jansen 4230905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 42315d13a37bSArne Jansen { 42320b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42330b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42345d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 42355d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42365d13a37bSArne Jansen int ret; 42375d13a37bSArne Jansen int err; 42385d13a37bSArne Jansen u64 qgroupid; 42395d13a37bSArne Jansen 42405d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42415d13a37bSArne Jansen return -EPERM; 42425d13a37bSArne Jansen 4243905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4244905b0ddaSMiao Xie if (ret) 4245905b0ddaSMiao Xie return ret; 42465d13a37bSArne Jansen 42475d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4248905b0ddaSMiao Xie if (IS_ERR(sa)) { 4249905b0ddaSMiao Xie ret = PTR_ERR(sa); 4250905b0ddaSMiao Xie goto drop_write; 4251905b0ddaSMiao Xie } 42525d13a37bSArne Jansen 42535d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42545d13a37bSArne Jansen if (IS_ERR(trans)) { 42555d13a37bSArne Jansen ret = PTR_ERR(trans); 42565d13a37bSArne Jansen goto out; 42575d13a37bSArne Jansen } 42585d13a37bSArne Jansen 42595d13a37bSArne Jansen qgroupid = sa->qgroupid; 42605d13a37bSArne Jansen if (!qgroupid) { 42615d13a37bSArne Jansen /* take the current subvol as qgroup */ 42625d13a37bSArne Jansen qgroupid = root->root_key.objectid; 42635d13a37bSArne Jansen } 42645d13a37bSArne Jansen 4265f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 42665d13a37bSArne Jansen 42673a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 42685d13a37bSArne Jansen if (err && !ret) 42695d13a37bSArne Jansen ret = err; 42705d13a37bSArne Jansen 42715d13a37bSArne Jansen out: 42725d13a37bSArne Jansen kfree(sa); 4273905b0ddaSMiao Xie drop_write: 4274905b0ddaSMiao Xie mnt_drop_write_file(file); 42755d13a37bSArne Jansen return ret; 42765d13a37bSArne Jansen } 42775d13a37bSArne Jansen 42782f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 42792f232036SJan Schmidt { 42800b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42810b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42822f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 42832f232036SJan Schmidt int ret; 42842f232036SJan Schmidt 42852f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 42862f232036SJan Schmidt return -EPERM; 42872f232036SJan Schmidt 42882f232036SJan Schmidt ret = mnt_want_write_file(file); 42892f232036SJan Schmidt if (ret) 42902f232036SJan Schmidt return ret; 42912f232036SJan Schmidt 42922f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 42932f232036SJan Schmidt if (IS_ERR(qsa)) { 42942f232036SJan Schmidt ret = PTR_ERR(qsa); 42952f232036SJan Schmidt goto drop_write; 42962f232036SJan Schmidt } 42972f232036SJan Schmidt 42982f232036SJan Schmidt if (qsa->flags) { 42992f232036SJan Schmidt ret = -EINVAL; 43002f232036SJan Schmidt goto out; 43012f232036SJan Schmidt } 43022f232036SJan Schmidt 43030b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 43042f232036SJan Schmidt 43052f232036SJan Schmidt out: 43062f232036SJan Schmidt kfree(qsa); 43072f232036SJan Schmidt drop_write: 43082f232036SJan Schmidt mnt_drop_write_file(file); 43092f232036SJan Schmidt return ret; 43102f232036SJan Schmidt } 43112f232036SJan Schmidt 4312b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4313b929c1d8SMarcos Paulo de Souza void __user *arg) 43142f232036SJan Schmidt { 43152f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 43162f232036SJan Schmidt int ret = 0; 43172f232036SJan Schmidt 43182f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 43192f232036SJan Schmidt return -EPERM; 43202f232036SJan Schmidt 43218d2db785SDavid Sterba qsa = kzalloc(sizeof(*qsa), GFP_KERNEL); 43222f232036SJan Schmidt if (!qsa) 43232f232036SJan Schmidt return -ENOMEM; 43242f232036SJan Schmidt 43250b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 43262f232036SJan Schmidt qsa->flags = 1; 43270b246afaSJeff Mahoney qsa->progress = fs_info->qgroup_rescan_progress.objectid; 43282f232036SJan Schmidt } 43292f232036SJan Schmidt 43302f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 43312f232036SJan Schmidt ret = -EFAULT; 43322f232036SJan Schmidt 43332f232036SJan Schmidt kfree(qsa); 43342f232036SJan Schmidt return ret; 43352f232036SJan Schmidt } 43362f232036SJan Schmidt 4337b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4338b929c1d8SMarcos Paulo de Souza void __user *arg) 433957254b6eSJan Schmidt { 434057254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 434157254b6eSJan Schmidt return -EPERM; 434257254b6eSJan Schmidt 43430b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 434457254b6eSJan Schmidt } 434557254b6eSJan Schmidt 4346abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4347abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 43488ea05e3aSAlexander Block { 4349496ad9aaSAl Viro struct inode *inode = file_inode(file); 43500b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 43518ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 43528ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 43538ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 435495582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 43558ea05e3aSAlexander Block int ret = 0; 4356dd5f9615SStefan Behrens int received_uuid_changed; 43578ea05e3aSAlexander Block 435821cb47beSChristian Brauner if (!inode_owner_or_capable(&init_user_ns, inode)) 4359bd60ea0fSDavid Sterba return -EPERM; 4360bd60ea0fSDavid Sterba 43618ea05e3aSAlexander Block ret = mnt_want_write_file(file); 43628ea05e3aSAlexander Block if (ret < 0) 43638ea05e3aSAlexander Block return ret; 43648ea05e3aSAlexander Block 43650b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 43668ea05e3aSAlexander Block 43674a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 43688ea05e3aSAlexander Block ret = -EINVAL; 43698ea05e3aSAlexander Block goto out; 43708ea05e3aSAlexander Block } 43718ea05e3aSAlexander Block 43728ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 43738ea05e3aSAlexander Block ret = -EROFS; 43748ea05e3aSAlexander Block goto out; 43758ea05e3aSAlexander Block } 43768ea05e3aSAlexander Block 4377dd5f9615SStefan Behrens /* 4378dd5f9615SStefan Behrens * 1 - root item 4379dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4380dd5f9615SStefan Behrens */ 4381dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 43828ea05e3aSAlexander Block if (IS_ERR(trans)) { 43838ea05e3aSAlexander Block ret = PTR_ERR(trans); 43848ea05e3aSAlexander Block trans = NULL; 43858ea05e3aSAlexander Block goto out; 43868ea05e3aSAlexander Block } 43878ea05e3aSAlexander Block 43888ea05e3aSAlexander Block sa->rtransid = trans->transid; 43898ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 43908ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 43918ea05e3aSAlexander Block 4392dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4393dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4394dd5f9615SStefan Behrens if (received_uuid_changed && 4395d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4396d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4397dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4398dd5f9615SStefan Behrens root->root_key.objectid); 4399d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4400d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4401d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4402d87ff758SNikolay Borisov goto out; 4403d87ff758SNikolay Borisov } 4404d87ff758SNikolay Borisov } 44058ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 44068ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 44078ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 44083cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 44093cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 44103cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 44113cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 44128ea05e3aSAlexander Block 44130b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 44148ea05e3aSAlexander Block &root->root_key, &root->root_item); 44158ea05e3aSAlexander Block if (ret < 0) { 44163a45bb20SJeff Mahoney btrfs_end_transaction(trans); 44178ea05e3aSAlexander Block goto out; 4418dd5f9615SStefan Behrens } 4419dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4420cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4421dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4422dd5f9615SStefan Behrens root->root_key.objectid); 4423dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 442466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4425efd38150SNikolay Borisov btrfs_end_transaction(trans); 4426dd5f9615SStefan Behrens goto out; 4427dd5f9615SStefan Behrens } 4428dd5f9615SStefan Behrens } 44293a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4430abccd00fSHugo Mills out: 44310b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4432abccd00fSHugo Mills mnt_drop_write_file(file); 4433abccd00fSHugo Mills return ret; 4434abccd00fSHugo Mills } 4435abccd00fSHugo Mills 4436abccd00fSHugo Mills #ifdef CONFIG_64BIT 4437abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4438abccd00fSHugo Mills void __user *arg) 4439abccd00fSHugo Mills { 4440abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4441abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4442abccd00fSHugo Mills int ret = 0; 4443abccd00fSHugo Mills 4444abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 44457b9ea627SShailendra Verma if (IS_ERR(args32)) 44467b9ea627SShailendra Verma return PTR_ERR(args32); 4447abccd00fSHugo Mills 44488d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 444984dbeb87SDan Carpenter if (!args64) { 445084dbeb87SDan Carpenter ret = -ENOMEM; 4451abccd00fSHugo Mills goto out; 4452abccd00fSHugo Mills } 4453abccd00fSHugo Mills 4454abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4455abccd00fSHugo Mills args64->stransid = args32->stransid; 4456abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4457abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4458abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4459abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4460abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4461abccd00fSHugo Mills args64->flags = args32->flags; 4462abccd00fSHugo Mills 4463abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4464abccd00fSHugo Mills if (ret) 4465abccd00fSHugo Mills goto out; 4466abccd00fSHugo Mills 4467abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4468abccd00fSHugo Mills args32->stransid = args64->stransid; 4469abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4470abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4471abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4472abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4473abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4474abccd00fSHugo Mills args32->flags = args64->flags; 4475abccd00fSHugo Mills 4476abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4477abccd00fSHugo Mills if (ret) 4478abccd00fSHugo Mills ret = -EFAULT; 4479abccd00fSHugo Mills 4480abccd00fSHugo Mills out: 4481abccd00fSHugo Mills kfree(args32); 4482abccd00fSHugo Mills kfree(args64); 4483abccd00fSHugo Mills return ret; 4484abccd00fSHugo Mills } 4485abccd00fSHugo Mills #endif 4486abccd00fSHugo Mills 4487abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4488abccd00fSHugo Mills void __user *arg) 4489abccd00fSHugo Mills { 4490abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4491abccd00fSHugo Mills int ret = 0; 4492abccd00fSHugo Mills 4493abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 44947b9ea627SShailendra Verma if (IS_ERR(sa)) 44957b9ea627SShailendra Verma return PTR_ERR(sa); 4496abccd00fSHugo Mills 4497abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4498abccd00fSHugo Mills 4499abccd00fSHugo Mills if (ret) 4500abccd00fSHugo Mills goto out; 4501abccd00fSHugo Mills 45028ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 45038ea05e3aSAlexander Block if (ret) 45048ea05e3aSAlexander Block ret = -EFAULT; 45058ea05e3aSAlexander Block 45068ea05e3aSAlexander Block out: 45078ea05e3aSAlexander Block kfree(sa); 45088ea05e3aSAlexander Block return ret; 45098ea05e3aSAlexander Block } 45108ea05e3aSAlexander Block 4511b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4512b929c1d8SMarcos Paulo de Souza void __user *arg) 4513867ab667Sjeff.liu { 4514a1b83ac5SAnand Jain size_t len; 4515867ab667Sjeff.liu int ret; 4516a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4517a1b83ac5SAnand Jain 45180b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 45190b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 45200b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4521a1b83ac5SAnand Jain 4522a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4523867ab667Sjeff.liu 4524867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 45250b246afaSJeff Mahoney btrfs_warn(fs_info, 45260b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 45270b246afaSJeff Mahoney --len); 4528867ab667Sjeff.liu } 4529867ab667Sjeff.liu 4530867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4531867ab667Sjeff.liu 4532867ab667Sjeff.liu return ret ? -EFAULT : 0; 4533867ab667Sjeff.liu } 4534867ab667Sjeff.liu 4535a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4536a8bfd4abSjeff.liu { 45370b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45380b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45390b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 45400b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4541a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4542a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4543a8bfd4abSjeff.liu int ret; 4544a8bfd4abSjeff.liu 4545a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4546a8bfd4abSjeff.liu return -EPERM; 4547a8bfd4abSjeff.liu 4548a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4549a8bfd4abSjeff.liu return -EFAULT; 4550a8bfd4abSjeff.liu 4551a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 45520b246afaSJeff Mahoney btrfs_err(fs_info, 45535d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4554a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4555a8bfd4abSjeff.liu return -EINVAL; 4556a8bfd4abSjeff.liu } 4557a8bfd4abSjeff.liu 4558a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4559a8bfd4abSjeff.liu if (ret) 4560a8bfd4abSjeff.liu return ret; 4561a8bfd4abSjeff.liu 4562a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4563a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4564a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4565a8bfd4abSjeff.liu goto out_unlock; 4566a8bfd4abSjeff.liu } 4567a8bfd4abSjeff.liu 45680b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4569a8bfd4abSjeff.liu strcpy(super_block->label, label); 45700b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 45713a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4572a8bfd4abSjeff.liu 4573a8bfd4abSjeff.liu out_unlock: 4574a8bfd4abSjeff.liu mnt_drop_write_file(file); 4575a8bfd4abSjeff.liu return ret; 4576a8bfd4abSjeff.liu } 4577a8bfd4abSjeff.liu 45782eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 45792eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 45802eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 45812eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 45822eaa055fSJeff Mahoney 4583d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 45842eaa055fSJeff Mahoney { 45854d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 45862eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 45872eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 45882eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 45892eaa055fSJeff Mahoney }; 45902eaa055fSJeff Mahoney 45912eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 45922eaa055fSJeff Mahoney return -EFAULT; 45932eaa055fSJeff Mahoney 45942eaa055fSJeff Mahoney return 0; 45952eaa055fSJeff Mahoney } 45962eaa055fSJeff Mahoney 4597b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4598b929c1d8SMarcos Paulo de Souza void __user *arg) 45992eaa055fSJeff Mahoney { 46000b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 46012eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 46022eaa055fSJeff Mahoney 46032eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 46042eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 46052eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 46062eaa055fSJeff Mahoney 46072eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 46082eaa055fSJeff Mahoney return -EFAULT; 46092eaa055fSJeff Mahoney 46102eaa055fSJeff Mahoney return 0; 46112eaa055fSJeff Mahoney } 46122eaa055fSJeff Mahoney 46132ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 46143b02a68aSJeff Mahoney enum btrfs_feature_set set, 46152eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 46162eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 46172eaa055fSJeff Mahoney { 4618f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 46193b02a68aSJeff Mahoney char *names; 46202eaa055fSJeff Mahoney u64 disallowed, unsupported; 46212eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 46222eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 46232eaa055fSJeff Mahoney 46242eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 46252eaa055fSJeff Mahoney if (unsupported) { 46263b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 46273b02a68aSJeff Mahoney if (names) { 46280b246afaSJeff Mahoney btrfs_warn(fs_info, 46293b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 46303b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46313b02a68aSJeff Mahoney kfree(names); 46323b02a68aSJeff Mahoney } else 46330b246afaSJeff Mahoney btrfs_warn(fs_info, 46342eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 46352eaa055fSJeff Mahoney type, unsupported); 46362eaa055fSJeff Mahoney return -EOPNOTSUPP; 46372eaa055fSJeff Mahoney } 46382eaa055fSJeff Mahoney 46392eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 46402eaa055fSJeff Mahoney if (disallowed) { 46413b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 46423b02a68aSJeff Mahoney if (names) { 46430b246afaSJeff Mahoney btrfs_warn(fs_info, 46443b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 46453b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46463b02a68aSJeff Mahoney kfree(names); 46473b02a68aSJeff Mahoney } else 46480b246afaSJeff Mahoney btrfs_warn(fs_info, 46492eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 46502eaa055fSJeff Mahoney type, disallowed); 46512eaa055fSJeff Mahoney return -EPERM; 46522eaa055fSJeff Mahoney } 46532eaa055fSJeff Mahoney 46542eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 46552eaa055fSJeff Mahoney if (disallowed) { 46563b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 46573b02a68aSJeff Mahoney if (names) { 46580b246afaSJeff Mahoney btrfs_warn(fs_info, 46593b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 46603b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46613b02a68aSJeff Mahoney kfree(names); 46623b02a68aSJeff Mahoney } else 46630b246afaSJeff Mahoney btrfs_warn(fs_info, 46642eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 46652eaa055fSJeff Mahoney type, disallowed); 46662eaa055fSJeff Mahoney return -EPERM; 46672eaa055fSJeff Mahoney } 46682eaa055fSJeff Mahoney 46692eaa055fSJeff Mahoney return 0; 46702eaa055fSJeff Mahoney } 46712eaa055fSJeff Mahoney 46722ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 46732ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 46742eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 46752eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 46762eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 46772eaa055fSJeff Mahoney 46782eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 46792eaa055fSJeff Mahoney { 46800b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46810b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 46820b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46830b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 46842eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 46852eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 46862eaa055fSJeff Mahoney u64 newflags; 46872eaa055fSJeff Mahoney int ret; 46882eaa055fSJeff Mahoney 46892eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 46902eaa055fSJeff Mahoney return -EPERM; 46912eaa055fSJeff Mahoney 46922eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 46932eaa055fSJeff Mahoney return -EFAULT; 46942eaa055fSJeff Mahoney 46952eaa055fSJeff Mahoney /* Nothing to do */ 46962eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 46972eaa055fSJeff Mahoney !flags[0].incompat_flags) 46982eaa055fSJeff Mahoney return 0; 46992eaa055fSJeff Mahoney 47002ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 47012eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 47022eaa055fSJeff Mahoney if (ret) 47032eaa055fSJeff Mahoney return ret; 47042eaa055fSJeff Mahoney 47052ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 47062eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 47072eaa055fSJeff Mahoney if (ret) 47082eaa055fSJeff Mahoney return ret; 47092eaa055fSJeff Mahoney 47102ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 47112eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 47122eaa055fSJeff Mahoney if (ret) 47132eaa055fSJeff Mahoney return ret; 47142eaa055fSJeff Mahoney 47157ab19625SDavid Sterba ret = mnt_want_write_file(file); 47167ab19625SDavid Sterba if (ret) 47177ab19625SDavid Sterba return ret; 47187ab19625SDavid Sterba 47198051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 47207ab19625SDavid Sterba if (IS_ERR(trans)) { 47217ab19625SDavid Sterba ret = PTR_ERR(trans); 47227ab19625SDavid Sterba goto out_drop_write; 47237ab19625SDavid Sterba } 47242eaa055fSJeff Mahoney 47250b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 47262eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 47272eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 47282eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 47292eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 47302eaa055fSJeff Mahoney 47312eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 47322eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 47332eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 47342eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 47352eaa055fSJeff Mahoney 47362eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 47372eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 47382eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 47392eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 47400b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 47412eaa055fSJeff Mahoney 47423a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 47437ab19625SDavid Sterba out_drop_write: 47447ab19625SDavid Sterba mnt_drop_write_file(file); 47457ab19625SDavid Sterba 47467ab19625SDavid Sterba return ret; 47472eaa055fSJeff Mahoney } 47482eaa055fSJeff Mahoney 47492351f431SJosef Bacik static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) 47502351f431SJosef Bacik { 47512351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 47522351f431SJosef Bacik int ret; 47532351f431SJosef Bacik 47542351f431SJosef Bacik if (compat) { 47552351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 47562351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 47572351f431SJosef Bacik 47582351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 47592351f431SJosef Bacik if (ret) 47602351f431SJosef Bacik return -EFAULT; 47612351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 47622351f431SJosef Bacik if (!arg) 47632351f431SJosef Bacik return -ENOMEM; 47642351f431SJosef Bacik arg->send_fd = args32.send_fd; 47652351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 47662351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 47672351f431SJosef Bacik arg->parent_root = args32.parent_root; 47682351f431SJosef Bacik arg->flags = args32.flags; 47692351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 47702351f431SJosef Bacik sizeof(args32.reserved)); 47712351f431SJosef Bacik #else 47722351f431SJosef Bacik return -ENOTTY; 47732351f431SJosef Bacik #endif 47742351f431SJosef Bacik } else { 47752351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 47762351f431SJosef Bacik if (IS_ERR(arg)) 47772351f431SJosef Bacik return PTR_ERR(arg); 47782351f431SJosef Bacik } 47792351f431SJosef Bacik ret = btrfs_ioctl_send(file, arg); 47802351f431SJosef Bacik kfree(arg); 47812351f431SJosef Bacik return ret; 47822351f431SJosef Bacik } 47832351f431SJosef Bacik 4784f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4785f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4786f46b5a66SChristoph Hellwig { 47870b246afaSJeff Mahoney struct inode *inode = file_inode(file); 47880b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 47890b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 47904bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4791f46b5a66SChristoph Hellwig 4792f46b5a66SChristoph Hellwig switch (cmd) { 47936cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 47946cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 479540cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4796b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 479740cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 479840cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4799f7039b1dSLi Dongyang case FITRIM: 4800b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4801f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4802fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4803fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4804fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 48053de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4806fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 48076f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 48086f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 480976dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4810949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4811949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4812949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 48130caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 48140caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 48150caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 48160caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 48176ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 48186ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4819f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 48201e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 48211e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 48221e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4823f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4824198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4825f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 48262ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 4827f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4828da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 48296b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 48306b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 4831475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 48322ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 4833475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 48342ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 4835f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 48369ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4837ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4838ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4839cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 4840cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 4841ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4842ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4843d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4844d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4845d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4846d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 4847d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 4848d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 48491406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 48502ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 48519b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 48529b199859SFilipe David Borba Manana int ret; 48539b199859SFilipe David Borba Manana 48549db4dc24SNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 48559b199859SFilipe David Borba Manana if (ret) 48569b199859SFilipe David Borba Manana return ret; 48570b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 48582fad4e83SDavid Sterba /* 48592fad4e83SDavid Sterba * The transaction thread may want to do more work, 486001327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 48612fad4e83SDavid Sterba * processing uncleaned subvols. 48622fad4e83SDavid Sterba */ 48630b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 48649b199859SFilipe David Borba Manana return ret; 48659b199859SFilipe David Borba Manana } 486646204592SSage Weil case BTRFS_IOC_START_SYNC: 48679a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 486846204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 48692ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 4870475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4871b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4872475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 48732ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 4874475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 48752ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 4876c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 48779ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4878837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 48792ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 488019a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 48812ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 48828ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 48838ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 4884abccd00fSHugo Mills #ifdef CONFIG_64BIT 4885abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 4886abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 4887abccd00fSHugo Mills #endif 488831db9f7cSAlexander Block case BTRFS_IOC_SEND: 48892351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, false); 48902351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 48912351f431SJosef Bacik case BTRFS_IOC_SEND_32: 48922351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, true); 48932351f431SJosef Bacik #endif 4894c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 48952ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 48965d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4897905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 48985d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4899905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 49005d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4901905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 49025d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4903905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 49042f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 49052f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 49062f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 4907b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 490857254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 4909b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 49103f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 49112ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 49122eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 4913d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 49142eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 4915b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 49162eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 49172eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 4918b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 4919b64ec075STomohiro Misono return btrfs_ioctl_get_subvol_info(file, argp); 492042e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 492142e4b520STomohiro Misono return btrfs_ioctl_get_subvol_rootref(file, argp); 492223d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 492323d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 4924f46b5a66SChristoph Hellwig } 4925f46b5a66SChristoph Hellwig 4926f46b5a66SChristoph Hellwig return -ENOTTY; 4927f46b5a66SChristoph Hellwig } 49284c63c245SLuke Dashjr 49294c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 49304c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 49314c63c245SLuke Dashjr { 49322a362249SJeff Mahoney /* 49332a362249SJeff Mahoney * These all access 32-bit values anyway so no further 49342a362249SJeff Mahoney * handling is necessary. 49352a362249SJeff Mahoney */ 49364c63c245SLuke Dashjr switch (cmd) { 49374c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 49384c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 49394c63c245SLuke Dashjr break; 49404c63c245SLuke Dashjr } 49414c63c245SLuke Dashjr 49424c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 49434c63c245SLuke Dashjr } 49444c63c245SLuke Dashjr #endif 4945