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); 2629b8a233bSRitesh Harjani if (IS_ERR(trans)) 2639b8a233bSRitesh 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 356*0d7ed32cSDavid Sterba /* 357*0d7ed32cSDavid Sterba * Start exclusive operation @type, return true on success 358*0d7ed32cSDavid Sterba */ 359c3e1f96cSGoldwyn Rodrigues bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, 360c3e1f96cSGoldwyn Rodrigues enum btrfs_exclusive_operation type) 361c3e1f96cSGoldwyn Rodrigues { 362*0d7ed32cSDavid Sterba bool ret = false; 363*0d7ed32cSDavid Sterba 364*0d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 365*0d7ed32cSDavid Sterba if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) { 366*0d7ed32cSDavid Sterba fs_info->exclusive_operation = type; 367*0d7ed32cSDavid Sterba ret = true; 368*0d7ed32cSDavid Sterba } 369*0d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 370*0d7ed32cSDavid Sterba 371*0d7ed32cSDavid Sterba return ret; 372c3e1f96cSGoldwyn Rodrigues } 373c3e1f96cSGoldwyn Rodrigues 374c3e1f96cSGoldwyn Rodrigues void btrfs_exclop_finish(struct btrfs_fs_info *fs_info) 375c3e1f96cSGoldwyn Rodrigues { 376*0d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 377c3e1f96cSGoldwyn Rodrigues WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE); 378*0d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 37966a2823cSGoldwyn Rodrigues sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation"); 380c3e1f96cSGoldwyn Rodrigues } 381c3e1f96cSGoldwyn Rodrigues 3826cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 3836cbff00fSChristoph Hellwig { 384496ad9aaSAl Viro struct inode *inode = file_inode(file); 3856cbff00fSChristoph Hellwig 3866cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 3876cbff00fSChristoph Hellwig } 388f46b5a66SChristoph Hellwig 389b929c1d8SMarcos Paulo de Souza static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, 390b929c1d8SMarcos Paulo de Souza void __user *arg) 391f7039b1dSLi Dongyang { 392f7039b1dSLi Dongyang struct btrfs_device *device; 393f7039b1dSLi Dongyang struct request_queue *q; 394f7039b1dSLi Dongyang struct fstrim_range range; 395f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 396f7039b1dSLi Dongyang u64 num_devices = 0; 397f7039b1dSLi Dongyang int ret; 398f7039b1dSLi Dongyang 399f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 400f7039b1dSLi Dongyang return -EPERM; 401f7039b1dSLi Dongyang 402f35f06c3SFilipe Manana /* 4031cb3dc3fSNaohiro Aota * btrfs_trim_block_group() depends on space cache, which is not 4041cb3dc3fSNaohiro Aota * available in zoned filesystem. So, disallow fitrim on a zoned 4051cb3dc3fSNaohiro Aota * filesystem for now. 4061cb3dc3fSNaohiro Aota */ 4071cb3dc3fSNaohiro Aota if (btrfs_is_zoned(fs_info)) 4081cb3dc3fSNaohiro Aota return -EOPNOTSUPP; 4091cb3dc3fSNaohiro Aota 4101cb3dc3fSNaohiro Aota /* 411f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 412f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 413f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 414f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 415f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 416f35f06c3SFilipe Manana */ 417f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 418f35f06c3SFilipe Manana return -EROFS; 419f35f06c3SFilipe Manana 4201f78160cSXiao Guangrong rcu_read_lock(); 4211f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 4221f78160cSXiao Guangrong dev_list) { 423f7039b1dSLi Dongyang if (!device->bdev) 424f7039b1dSLi Dongyang continue; 425f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 426f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 427f7039b1dSLi Dongyang num_devices++; 42850d0446eSSeraphime Kirkovski minlen = min_t(u64, q->limits.discard_granularity, 429f7039b1dSLi Dongyang minlen); 430f7039b1dSLi Dongyang } 431f7039b1dSLi Dongyang } 4321f78160cSXiao Guangrong rcu_read_unlock(); 433f4c697e6SLukas Czerner 434f7039b1dSLi Dongyang if (!num_devices) 435f7039b1dSLi Dongyang return -EOPNOTSUPP; 436f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 437f7039b1dSLi Dongyang return -EFAULT; 4386ba9fc8eSQu Wenruo 4396ba9fc8eSQu Wenruo /* 4406ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 4416ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 4426ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 4436ba9fc8eSQu Wenruo */ 4446ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 445f4c697e6SLukas Czerner return -EINVAL; 446f7039b1dSLi Dongyang 447f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 4482ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 449f7039b1dSLi Dongyang if (ret < 0) 450f7039b1dSLi Dongyang return ret; 451f7039b1dSLi Dongyang 452f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 453f7039b1dSLi Dongyang return -EFAULT; 454f7039b1dSLi Dongyang 455f7039b1dSLi Dongyang return 0; 456f7039b1dSLi Dongyang } 457f7039b1dSLi Dongyang 458e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 459dd5f9615SStefan Behrens { 46046e0f66aSChris Mason int i; 46146e0f66aSChris Mason 46246e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 46346e0f66aSChris Mason if (uuid[i]) 46446e0f66aSChris Mason return 0; 46546e0f66aSChris Mason } 46646e0f66aSChris Mason return 1; 467dd5f9615SStefan Behrens } 468dd5f9615SStefan Behrens 469d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 470cb8e7090SChristoph Hellwig struct dentry *dentry, 47152f75f4fSDavid Sterba const char *name, int namelen, 4728696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 473f46b5a66SChristoph Hellwig { 4740b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 475f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 476f46b5a66SChristoph Hellwig struct btrfs_key key; 47749a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 478f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 479f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 480d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 48176dda93cSYan, Zheng struct btrfs_root *new_root; 482d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 48395582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 4845662344bSTsutomu Itoh struct inode *inode; 485f46b5a66SChristoph Hellwig int ret; 486f46b5a66SChristoph Hellwig int err; 4872dfb1e43SQu Wenruo dev_t anon_dev = 0; 488f46b5a66SChristoph Hellwig u64 objectid; 4893de4586cSChris Mason u64 index = 0; 490f46b5a66SChristoph Hellwig 49149a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 49249a3c4d9SDavid Sterba if (!root_item) 49349a3c4d9SDavid Sterba return -ENOMEM; 49449a3c4d9SDavid Sterba 495543068a2SNikolay Borisov ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); 4962fbe8c8aSAl Viro if (ret) 49749a3c4d9SDavid Sterba goto fail_free; 4986a912213SJosef Bacik 4992dfb1e43SQu Wenruo ret = get_anon_bdev(&anon_dev); 5002dfb1e43SQu Wenruo if (ret < 0) 5012dfb1e43SQu Wenruo goto fail_free; 5022dfb1e43SQu Wenruo 503e09fe2d2SQu Wenruo /* 504e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 50501327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 506e09fe2d2SQu Wenruo */ 50749a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 50849a3c4d9SDavid Sterba ret = -ENOSPC; 50949a3c4d9SDavid Sterba goto fail_free; 51049a3c4d9SDavid Sterba } 511e09fe2d2SQu Wenruo 512d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 5139ed74f2dSJosef Bacik /* 514d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 515d5c12070SMiao Xie * of create_snapshot(). 5169ed74f2dSJosef Bacik */ 517c4c129dbSGu JinXiang ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false); 518d5c12070SMiao Xie if (ret) 51949a3c4d9SDavid Sterba goto fail_free; 520f46b5a66SChristoph Hellwig 521d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 522d5c12070SMiao Xie if (IS_ERR(trans)) { 523d5c12070SMiao Xie ret = PTR_ERR(trans); 524e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 52549a3c4d9SDavid Sterba goto fail_free; 526d5c12070SMiao Xie } 527d5c12070SMiao Xie trans->block_rsv = &block_rsv; 528d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 529f46b5a66SChristoph Hellwig 530a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 5316f72c7e2SArne Jansen if (ret) 5326f72c7e2SArne Jansen goto fail; 5336f72c7e2SArne Jansen 5349631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 5359631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 5368e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 5378e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 5388e8a1e31SJosef Bacik goto fail; 5398e8a1e31SJosef Bacik } 540f46b5a66SChristoph Hellwig 541f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 542f46b5a66SChristoph Hellwig 54349a3c4d9SDavid Sterba inode_item = &root_item->inode; 5443cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 5453cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 5463cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 547da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 5480b246afaSJeff Mahoney fs_info->nodesize); 5493cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 550f46b5a66SChristoph Hellwig 55149a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 55249a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 5533cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 55408fe4db1SLi Zefan 55549a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 55649a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 55749a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 55849a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 55949a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 56049a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 561f46b5a66SChristoph Hellwig 56249a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 56349a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 564807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 56549a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 56649a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 56749a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 56849a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 56949a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 570f46b5a66SChristoph Hellwig 571925baeddSChris Mason btrfs_tree_unlock(leaf); 572f46b5a66SChristoph Hellwig 57369948022SNikolay Borisov btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); 574f46b5a66SChristoph Hellwig 575f46b5a66SChristoph Hellwig key.objectid = objectid; 5765d4f98a2SYan Zheng key.offset = 0; 577962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 5780b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 57949a3c4d9SDavid Sterba root_item); 58067addf29SFilipe Manana if (ret) { 58167addf29SFilipe Manana /* 58267addf29SFilipe Manana * Since we don't abort the transaction in this case, free the 58367addf29SFilipe Manana * tree block so that we don't leak space and leave the 58467addf29SFilipe Manana * filesystem in an inconsistent state (an extent item in the 58567addf29SFilipe Manana * extent tree without backreferences). Also no need to have 58667addf29SFilipe Manana * the tree block locked since it is not in any tree at this 58767addf29SFilipe Manana * point, so no other task can find it and use it. 58867addf29SFilipe Manana */ 58967addf29SFilipe Manana btrfs_free_tree_block(trans, root, leaf, 0, 1); 59067addf29SFilipe Manana free_extent_buffer(leaf); 591f46b5a66SChristoph Hellwig goto fail; 59267addf29SFilipe Manana } 59367addf29SFilipe Manana 59467addf29SFilipe Manana free_extent_buffer(leaf); 59567addf29SFilipe Manana leaf = NULL; 596f46b5a66SChristoph Hellwig 59776dda93cSYan, Zheng key.offset = (u64)-1; 5982dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 59979787eaaSJeff Mahoney if (IS_ERR(new_root)) { 6002dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 60179787eaaSJeff Mahoney ret = PTR_ERR(new_root); 60266642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 60379787eaaSJeff Mahoney goto fail; 60479787eaaSJeff Mahoney } 6052dfb1e43SQu Wenruo /* Freeing will be done in btrfs_put_root() of new_root */ 6062dfb1e43SQu Wenruo anon_dev = 0; 60776dda93cSYan, Zheng 608221581e4SJosef Bacik ret = btrfs_record_root_in_trans(trans, new_root); 609221581e4SJosef Bacik if (ret) { 610221581e4SJosef Bacik btrfs_put_root(new_root); 611221581e4SJosef Bacik btrfs_abort_transaction(trans, ret); 612221581e4SJosef Bacik goto fail; 613221581e4SJosef Bacik } 61476dda93cSYan, Zheng 61569948022SNikolay Borisov ret = btrfs_create_subvol_root(trans, new_root, root); 61600246528SJosef Bacik btrfs_put_root(new_root); 617ce598979SMark Fasheh if (ret) { 618ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 61966642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 620ce598979SMark Fasheh goto fail; 621ce598979SMark Fasheh } 622ce598979SMark Fasheh 623f46b5a66SChristoph Hellwig /* 624f46b5a66SChristoph Hellwig * insert the directory item 625f46b5a66SChristoph Hellwig */ 626877574e2SNikolay Borisov ret = btrfs_set_inode_index(BTRFS_I(dir), &index); 62779787eaaSJeff Mahoney if (ret) { 62866642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 62979787eaaSJeff Mahoney goto fail; 63079787eaaSJeff Mahoney } 6313de4586cSChris Mason 632684572dfSLu Fengqi ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key, 6333de4586cSChris Mason BTRFS_FT_DIR, index); 63479787eaaSJeff Mahoney if (ret) { 63566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 636f46b5a66SChristoph Hellwig goto fail; 63779787eaaSJeff Mahoney } 6380660b5afSChris Mason 6396ef06d27SNikolay Borisov btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); 6409a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(dir)); 641c7e54b51SJosef Bacik if (ret) { 642c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 643c7e54b51SJosef Bacik goto fail; 644c7e54b51SJosef Bacik } 64552c26179SYan Zheng 6466025c19fSLu Fengqi ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid, 6474a0cc7caSNikolay Borisov btrfs_ino(BTRFS_I(dir)), index, name, namelen); 648c7e54b51SJosef Bacik if (ret) { 649c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 650c7e54b51SJosef Bacik goto fail; 651c7e54b51SJosef Bacik } 6520660b5afSChris Mason 653cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 6546bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 655dd5f9615SStefan Behrens if (ret) 65666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 657dd5f9615SStefan Behrens 658f46b5a66SChristoph Hellwig fail: 65949a3c4d9SDavid Sterba kfree(root_item); 660d5c12070SMiao Xie trans->block_rsv = NULL; 661d5c12070SMiao Xie trans->bytes_reserved = 0; 662e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 663de6e8200SLiu Bo 6643a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 665f46b5a66SChristoph Hellwig if (err && !ret) 666f46b5a66SChristoph Hellwig ret = err; 6671a65e24bSChris Mason 6685662344bSTsutomu Itoh if (!ret) { 6695662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 670de6e8200SLiu Bo if (IS_ERR(inode)) 671de6e8200SLiu Bo return PTR_ERR(inode); 6725662344bSTsutomu Itoh d_instantiate(dentry, inode); 6735662344bSTsutomu Itoh } 674f46b5a66SChristoph Hellwig return ret; 67549a3c4d9SDavid Sterba 67649a3c4d9SDavid Sterba fail_free: 6772dfb1e43SQu Wenruo if (anon_dev) 6782dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 67949a3c4d9SDavid Sterba kfree(root_item); 68049a3c4d9SDavid Sterba return ret; 681f46b5a66SChristoph Hellwig } 682f46b5a66SChristoph Hellwig 683e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 6849babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 685e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 686f46b5a66SChristoph Hellwig { 6870b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 6882e4bfab9SYan, Zheng struct inode *inode; 689f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 690f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 6912e4bfab9SYan, Zheng int ret; 692f46b5a66SChristoph Hellwig 69392a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 694f46b5a66SChristoph Hellwig return -EINVAL; 695f46b5a66SChristoph Hellwig 696eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 697eede2bf3SOmar Sandoval btrfs_warn(fs_info, 698eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 699eede2bf3SOmar Sandoval return -ETXTBSY; 700eede2bf3SOmar Sandoval } 701eede2bf3SOmar Sandoval 70223269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 703a1ee7362SDavid Sterba if (!pending_snapshot) 704a1ee7362SDavid Sterba return -ENOMEM; 705a1ee7362SDavid Sterba 7062dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 7072dfb1e43SQu Wenruo if (ret < 0) 7082dfb1e43SQu Wenruo goto free_pending; 709b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 71023269bf5SDavid Sterba GFP_KERNEL); 7118546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 7128546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 713b0c0ea63SDavid Sterba ret = -ENOMEM; 714b0c0ea63SDavid Sterba goto free_pending; 715b0c0ea63SDavid Sterba } 716b0c0ea63SDavid Sterba 71766d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 71866d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 719d5c12070SMiao Xie /* 720d5c12070SMiao Xie * 1 - parent dir inode 721d5c12070SMiao Xie * 2 - dir entries 722d5c12070SMiao Xie * 1 - root item 723d5c12070SMiao Xie * 2 - root ref/backref 724d5c12070SMiao Xie * 1 - root of snapshot 725dd5f9615SStefan Behrens * 1 - UUID item 726d5c12070SMiao Xie */ 727d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 728dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 729ee3441b4SJeff Mahoney false); 730d5c12070SMiao Xie if (ret) 731c11fbb6eSRobbie Ko goto free_pending; 732d5c12070SMiao Xie 733a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 734a22285a6SYan, Zheng pending_snapshot->root = root; 735b83cc969SLi Zefan pending_snapshot->readonly = readonly; 736e9662f70SMiao Xie pending_snapshot->dir = dir; 7378696c533SMiao Xie pending_snapshot->inherit = inherit; 738a22285a6SYan, Zheng 739d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 740a22285a6SYan, Zheng if (IS_ERR(trans)) { 741a22285a6SYan, Zheng ret = PTR_ERR(trans); 742a22285a6SYan, Zheng goto fail; 743a22285a6SYan, Zheng } 744a22285a6SYan, Zheng 7450b246afaSJeff Mahoney spin_lock(&fs_info->trans_lock); 746a22285a6SYan, Zheng list_add(&pending_snapshot->list, 747a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 7480b246afaSJeff Mahoney spin_unlock(&fs_info->trans_lock); 7499babda9fSNikolay Borisov 7503a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 751aec8030aSMiao Xie if (ret) 752c37b2b62SJosef Bacik goto fail; 753a22285a6SYan, Zheng 754a22285a6SYan, Zheng ret = pending_snapshot->error; 755f46b5a66SChristoph Hellwig if (ret) 7562e4bfab9SYan, Zheng goto fail; 757f46b5a66SChristoph Hellwig 758d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 759d3797308SChris Mason if (ret) 760d3797308SChris Mason goto fail; 761d3797308SChris Mason 7622b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 7632e4bfab9SYan, Zheng if (IS_ERR(inode)) { 7642e4bfab9SYan, Zheng ret = PTR_ERR(inode); 7652e4bfab9SYan, Zheng goto fail; 7662e4bfab9SYan, Zheng } 7675662344bSTsutomu Itoh 7682e4bfab9SYan, Zheng d_instantiate(dentry, inode); 7692e4bfab9SYan, Zheng ret = 0; 7702dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 7712e4bfab9SYan, Zheng fail: 7722dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 7732dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 7742dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 77500246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 776e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 777b0c0ea63SDavid Sterba free_pending: 7782dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 7792dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 780b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 7818546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 782a1ee7362SDavid Sterba kfree(pending_snapshot); 783a1ee7362SDavid Sterba 784f46b5a66SChristoph Hellwig return ret; 785f46b5a66SChristoph Hellwig } 786f46b5a66SChristoph Hellwig 7874260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 7884260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 7894260f7c7SSage Weil * whether the type of victim is right. 7904260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 7914260f7c7SSage Weil * 2. We should have write and exec permissions on dir 7924260f7c7SSage Weil * 3. We can't remove anything from append-only dir 7934260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 7944260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 7954260f7c7SSage Weil * a. be owner of dir, or 7964260f7c7SSage Weil * b. be owner of victim, or 7974260f7c7SSage Weil * c. have CAP_FOWNER capability 79801327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 7994260f7c7SSage Weil * links pointing to it. 8004260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8014260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 8024260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 8034260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 8044260f7c7SSage Weil * nfs_async_unlink(). 8054260f7c7SSage Weil */ 8064260f7c7SSage Weil 8074260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 8084260f7c7SSage Weil { 8094260f7c7SSage Weil int error; 8104260f7c7SSage Weil 8112b0143b5SDavid Howells if (d_really_is_negative(victim)) 8124260f7c7SSage Weil return -ENOENT; 8134260f7c7SSage Weil 8142b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 8154fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 8164260f7c7SSage Weil 81747291baaSChristian Brauner error = inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC); 8184260f7c7SSage Weil if (error) 8194260f7c7SSage Weil return error; 8204260f7c7SSage Weil if (IS_APPEND(dir)) 8214260f7c7SSage Weil return -EPERM; 822ba73d987SChristian Brauner if (check_sticky(&init_user_ns, dir, d_inode(victim)) || 823ba73d987SChristian Brauner IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) || 824ba73d987SChristian Brauner IS_SWAPFILE(d_inode(victim))) 8254260f7c7SSage Weil return -EPERM; 8264260f7c7SSage Weil if (isdir) { 827e36cb0b8SDavid Howells if (!d_is_dir(victim)) 8284260f7c7SSage Weil return -ENOTDIR; 8294260f7c7SSage Weil if (IS_ROOT(victim)) 8304260f7c7SSage Weil return -EBUSY; 831e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 8324260f7c7SSage Weil return -EISDIR; 8334260f7c7SSage Weil if (IS_DEADDIR(dir)) 8344260f7c7SSage Weil return -ENOENT; 8354260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 8364260f7c7SSage Weil return -EBUSY; 8374260f7c7SSage Weil return 0; 8384260f7c7SSage Weil } 8394260f7c7SSage Weil 840cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 841cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 842cb8e7090SChristoph Hellwig { 8432b0143b5SDavid Howells if (d_really_is_positive(child)) 844cb8e7090SChristoph Hellwig return -EEXIST; 845cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 846cb8e7090SChristoph Hellwig return -ENOENT; 84747291baaSChristian Brauner return inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC); 848cb8e7090SChristoph Hellwig } 849cb8e7090SChristoph Hellwig 850cb8e7090SChristoph Hellwig /* 851cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 852cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 853cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 854cb8e7090SChristoph Hellwig */ 85592872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 85652f75f4fSDavid Sterba const char *name, int namelen, 85772fd032eSSage Weil struct btrfs_root *snap_src, 8589babda9fSNikolay Borisov bool readonly, 8598696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 860cb8e7090SChristoph Hellwig { 8612b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 8620b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 863cb8e7090SChristoph Hellwig struct dentry *dentry; 864cb8e7090SChristoph Hellwig int error; 865cb8e7090SChristoph Hellwig 86600235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 86700235411SAl Viro if (error == -EINTR) 86800235411SAl Viro return error; 869cb8e7090SChristoph Hellwig 870cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 871cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 872cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 873cb8e7090SChristoph Hellwig goto out_unlock; 874cb8e7090SChristoph Hellwig 87576dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 876cb8e7090SChristoph Hellwig if (error) 877a874a63eSLiu Bo goto out_dput; 878cb8e7090SChristoph Hellwig 8799c52057cSChris Mason /* 8809c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 8819c52057cSChris Mason * check for them now when we can safely fail 8829c52057cSChris Mason */ 8839c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 8849c52057cSChris Mason dir->i_ino, name, 8859c52057cSChris Mason namelen); 8869c52057cSChris Mason if (error) 8879c52057cSChris Mason goto out_dput; 8889c52057cSChris Mason 8890b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 89076dda93cSYan, Zheng 89176dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 89276dda93cSYan, Zheng goto out_up_read; 89376dda93cSYan, Zheng 8949babda9fSNikolay Borisov if (snap_src) 8959babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 8969babda9fSNikolay Borisov else 8979babda9fSNikolay Borisov error = create_subvol(dir, dentry, name, namelen, inherit); 8989babda9fSNikolay Borisov 89976dda93cSYan, Zheng if (!error) 90076dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 90176dda93cSYan, Zheng out_up_read: 9020b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 903cb8e7090SChristoph Hellwig out_dput: 904cb8e7090SChristoph Hellwig dput(dentry); 905cb8e7090SChristoph Hellwig out_unlock: 90664708539SJosef Bacik btrfs_inode_unlock(dir, 0); 907cb8e7090SChristoph Hellwig return error; 908cb8e7090SChristoph Hellwig } 909cb8e7090SChristoph Hellwig 910c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 911c11fbb6eSRobbie Ko const char *name, int namelen, 912c11fbb6eSRobbie Ko struct btrfs_root *root, 913c11fbb6eSRobbie Ko bool readonly, 914c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 915c11fbb6eSRobbie Ko { 916c11fbb6eSRobbie Ko int ret; 917c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 918c11fbb6eSRobbie Ko 919c11fbb6eSRobbie Ko /* 920c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 921c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 922c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 923c11fbb6eSRobbie Ko */ 924c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 925c11fbb6eSRobbie Ko 926f9baa501SFilipe Manana ret = btrfs_start_delalloc_snapshot(root, false); 927c11fbb6eSRobbie Ko if (ret) 928c11fbb6eSRobbie Ko goto out; 929c11fbb6eSRobbie Ko 930c11fbb6eSRobbie Ko /* 931c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 932c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 933c11fbb6eSRobbie Ko * creation. 934c11fbb6eSRobbie Ko */ 935c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 936c11fbb6eSRobbie Ko snapshot_force_cow = true; 937c11fbb6eSRobbie Ko 938c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 939c11fbb6eSRobbie Ko 940c11fbb6eSRobbie Ko ret = btrfs_mksubvol(parent, name, namelen, 941c11fbb6eSRobbie Ko root, readonly, inherit); 942c11fbb6eSRobbie Ko out: 943c11fbb6eSRobbie Ko if (snapshot_force_cow) 944c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 945c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 946c11fbb6eSRobbie Ko return ret; 947c11fbb6eSRobbie Ko } 948c11fbb6eSRobbie Ko 9494cb5300bSChris Mason /* 9504cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 9514cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 9524cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 9534cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 9544cb5300bSChris Mason * part of the file 9554cb5300bSChris Mason */ 956aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 9574cb5300bSChris Mason { 9584cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 9594cb5300bSChris Mason struct extent_map *em = NULL; 9604cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 9614cb5300bSChris Mason u64 end; 9624cb5300bSChris Mason 9634cb5300bSChris Mason read_lock(&em_tree->lock); 96409cbfeafSKirill A. Shutemov em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE); 9654cb5300bSChris Mason read_unlock(&em_tree->lock); 9664cb5300bSChris Mason 9674cb5300bSChris Mason if (em) { 9684cb5300bSChris Mason end = extent_map_end(em); 9694cb5300bSChris Mason free_extent_map(em); 9704cb5300bSChris Mason if (end - offset > thresh) 9714cb5300bSChris Mason return 0; 9724cb5300bSChris Mason } 9734cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 9744cb5300bSChris Mason thresh /= 2; 9754cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 9764cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 9774cb5300bSChris Mason if (end >= thresh) 9784cb5300bSChris Mason return 0; 9794cb5300bSChris Mason return 1; 9804cb5300bSChris Mason } 9814cb5300bSChris Mason 9824cb5300bSChris Mason /* 9834cb5300bSChris Mason * helper function to walk through a file and find extents 9844cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 9854cb5300bSChris Mason * 9864cb5300bSChris Mason * This is used by the defragging code to find new and small 9874cb5300bSChris Mason * extents 9884cb5300bSChris Mason */ 9894cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 9904cb5300bSChris Mason struct inode *inode, u64 newer_than, 991aab110abSDavid Sterba u64 *off, u32 thresh) 9924cb5300bSChris Mason { 9934cb5300bSChris Mason struct btrfs_path *path; 9944cb5300bSChris Mason struct btrfs_key min_key; 9954cb5300bSChris Mason struct extent_buffer *leaf; 9964cb5300bSChris Mason struct btrfs_file_extent_item *extent; 9974cb5300bSChris Mason int type; 9984cb5300bSChris Mason int ret; 9994a0cc7caSNikolay Borisov u64 ino = btrfs_ino(BTRFS_I(inode)); 10004cb5300bSChris Mason 10014cb5300bSChris Mason path = btrfs_alloc_path(); 10024cb5300bSChris Mason if (!path) 10034cb5300bSChris Mason return -ENOMEM; 10044cb5300bSChris Mason 1005a4689d2bSDavid Sterba min_key.objectid = ino; 10064cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 10074cb5300bSChris Mason min_key.offset = *off; 10084cb5300bSChris Mason 10094cb5300bSChris Mason while (1) { 10106174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 10114cb5300bSChris Mason if (ret != 0) 10124cb5300bSChris Mason goto none; 1013f094c9bdSFilipe Manana process_slot: 1014a4689d2bSDavid Sterba if (min_key.objectid != ino) 10154cb5300bSChris Mason goto none; 10164cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 10174cb5300bSChris Mason goto none; 10184cb5300bSChris Mason 10194cb5300bSChris Mason leaf = path->nodes[0]; 10204cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 10214cb5300bSChris Mason struct btrfs_file_extent_item); 10224cb5300bSChris Mason 10234cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 10244cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 10254cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 10264cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 10274cb5300bSChris Mason *off = min_key.offset; 10284cb5300bSChris Mason btrfs_free_path(path); 10294cb5300bSChris Mason return 0; 10304cb5300bSChris Mason } 10314cb5300bSChris Mason 1032f094c9bdSFilipe Manana path->slots[0]++; 1033f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 1034f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 1035f094c9bdSFilipe Manana goto process_slot; 1036f094c9bdSFilipe Manana } 1037f094c9bdSFilipe Manana 10384cb5300bSChris Mason if (min_key.offset == (u64)-1) 10394cb5300bSChris Mason goto none; 10404cb5300bSChris Mason 10414cb5300bSChris Mason min_key.offset++; 10424cb5300bSChris Mason btrfs_release_path(path); 10434cb5300bSChris Mason } 10444cb5300bSChris Mason none: 10454cb5300bSChris Mason btrfs_free_path(path); 10464cb5300bSChris Mason return -ENOENT; 10474cb5300bSChris Mason } 10484cb5300bSChris Mason 10496c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 105017ce6ef8SLiu Bo { 105117ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1052940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 10536c282eb4SLi Zefan struct extent_map *em; 105409cbfeafSKirill A. Shutemov u64 len = PAGE_SIZE; 1055940100a4SChris Mason 1056940100a4SChris Mason /* 1057940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1058940100a4SChris Mason * the full extent lock 1059940100a4SChris Mason */ 1060940100a4SChris Mason read_lock(&em_tree->lock); 1061940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 1062940100a4SChris Mason read_unlock(&em_tree->lock); 1063940100a4SChris Mason 1064940100a4SChris Mason if (!em) { 1065308d9800SFilipe Manana struct extent_state *cached = NULL; 1066308d9800SFilipe Manana u64 end = start + len - 1; 1067308d9800SFilipe Manana 1068940100a4SChris Mason /* get the big lock and read metadata off disk */ 1069ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 107039b07b5dSOmar Sandoval em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len); 1071e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1072940100a4SChris Mason 10736cf8bfbfSDan Carpenter if (IS_ERR(em)) 10746c282eb4SLi Zefan return NULL; 1075940100a4SChris Mason } 1076940100a4SChris Mason 10776c282eb4SLi Zefan return em; 10786c282eb4SLi Zefan } 10796c282eb4SLi Zefan 10806c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 10816c282eb4SLi Zefan { 10826c282eb4SLi Zefan struct extent_map *next; 10836c282eb4SLi Zefan bool ret = true; 10846c282eb4SLi Zefan 10856c282eb4SLi Zefan /* this is the last extent */ 10866c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 10876c282eb4SLi Zefan return false; 10886c282eb4SLi Zefan 10896c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1090e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1091e9512d72SChris Mason ret = false; 1092e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1093ee22184bSByongho Lee (em->block_len > SZ_128K && next->block_len > SZ_128K)) 10946c282eb4SLi Zefan ret = false; 10956c282eb4SLi Zefan 10966c282eb4SLi Zefan free_extent_map(next); 10976c282eb4SLi Zefan return ret; 10986c282eb4SLi Zefan } 10996c282eb4SLi Zefan 1100aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1101a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1102a43a2111SAndrew Mahone int compress) 11036c282eb4SLi Zefan { 11046c282eb4SLi Zefan struct extent_map *em; 11056c282eb4SLi Zefan int ret = 1; 11066c282eb4SLi Zefan bool next_mergeable = true; 11074a3560c4SLiu Bo bool prev_mergeable = true; 11086c282eb4SLi Zefan 11096c282eb4SLi Zefan /* 11106c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 11116c282eb4SLi Zefan * defragging it 11126c282eb4SLi Zefan */ 11136c282eb4SLi Zefan if (start < *defrag_end) 11146c282eb4SLi Zefan return 1; 11156c282eb4SLi Zefan 11166c282eb4SLi Zefan *skip = 0; 11176c282eb4SLi Zefan 11186c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 11196c282eb4SLi Zefan if (!em) 11206c282eb4SLi Zefan return 0; 11216c282eb4SLi Zefan 1122940100a4SChris Mason /* this will cover holes, and inline extents */ 112317ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1124940100a4SChris Mason ret = 0; 112517ce6ef8SLiu Bo goto out; 112617ce6ef8SLiu Bo } 112717ce6ef8SLiu Bo 11284a3560c4SLiu Bo if (!*defrag_end) 11294a3560c4SLiu Bo prev_mergeable = false; 11304a3560c4SLiu Bo 11316c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1132940100a4SChris Mason /* 11336c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 11346c282eb4SLi Zefan * real extent, don't bother defragging it 1135940100a4SChris Mason */ 1136a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 11374a3560c4SLiu Bo (em->len >= thresh || (!next_mergeable && !prev_mergeable))) 1138940100a4SChris Mason ret = 0; 113917ce6ef8SLiu Bo out: 1140940100a4SChris Mason /* 1141940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1142940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1143940100a4SChris Mason * so that the next tiny extent will force a defrag. 1144940100a4SChris Mason * 1145940100a4SChris Mason * The end result of this is that tiny extents before a single big 1146940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1147940100a4SChris Mason */ 1148940100a4SChris Mason if (ret) { 1149940100a4SChris Mason *defrag_end = extent_map_end(em); 1150940100a4SChris Mason } else { 1151940100a4SChris Mason *last_len = 0; 1152940100a4SChris Mason *skip = extent_map_end(em); 1153940100a4SChris Mason *defrag_end = 0; 1154940100a4SChris Mason } 1155940100a4SChris Mason 1156940100a4SChris Mason free_extent_map(em); 1157940100a4SChris Mason return ret; 1158940100a4SChris Mason } 1159940100a4SChris Mason 11604cb5300bSChris Mason /* 11614cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 11624cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 11634cb5300bSChris Mason * to COW and defrag. 11644cb5300bSChris Mason * 11654cb5300bSChris Mason * It also makes sure the delalloc code has enough 11664cb5300bSChris Mason * dirty data to avoid making new small extents as part 11674cb5300bSChris Mason * of the defrag 11684cb5300bSChris Mason * 11694cb5300bSChris Mason * It's a good idea to start RA on this range 11704cb5300bSChris Mason * before calling this. 11714cb5300bSChris Mason */ 11724cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 11734cb5300bSChris Mason struct page **pages, 11744cb5300bSChris Mason unsigned long start_index, 1175c41570c9SJustin Maggard unsigned long num_pages) 1176f46b5a66SChristoph Hellwig { 11774cb5300bSChris Mason unsigned long file_end; 11784cb5300bSChris Mason u64 isize = i_size_read(inode); 1179f46b5a66SChristoph Hellwig u64 page_start; 1180f46b5a66SChristoph Hellwig u64 page_end; 11811f12bd06SLiu Bo u64 page_cnt; 1182a1fbc675SMatthew Wilcox (Oracle) u64 start = (u64)start_index << PAGE_SHIFT; 11837f458a38SFilipe Manana u64 search_start; 11844cb5300bSChris Mason int ret; 11854cb5300bSChris Mason int i; 11864cb5300bSChris Mason int i_done; 11874cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 11884cb5300bSChris Mason struct extent_state *cached_state = NULL; 1189600a45e1SMiao Xie struct extent_io_tree *tree; 1190364ecf36SQu Wenruo struct extent_changeset *data_reserved = NULL; 11913b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 11924cb5300bSChris Mason 119309cbfeafSKirill A. Shutemov file_end = (isize - 1) >> PAGE_SHIFT; 11941f12bd06SLiu Bo if (!isize || start_index > file_end) 11951f12bd06SLiu Bo return 0; 11961f12bd06SLiu Bo 11971f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 11984cb5300bSChris Mason 1199e5b7231eSNikolay Borisov ret = btrfs_delalloc_reserve_space(BTRFS_I(inode), &data_reserved, 1200a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT); 12014cb5300bSChris Mason if (ret) 12024cb5300bSChris Mason return ret; 12034cb5300bSChris Mason i_done = 0; 1204600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 12054cb5300bSChris Mason 12064cb5300bSChris Mason /* step one, lock all the pages */ 12071f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 12084cb5300bSChris Mason struct page *page; 1209600a45e1SMiao Xie again: 1210a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 12113b16a4e3SJosef Bacik start_index + i, mask); 12124cb5300bSChris Mason if (!page) 12134cb5300bSChris Mason break; 12144cb5300bSChris Mason 121532443de3SQu Wenruo ret = set_page_extent_mapped(page); 121632443de3SQu Wenruo if (ret < 0) { 121732443de3SQu Wenruo unlock_page(page); 121832443de3SQu Wenruo put_page(page); 121932443de3SQu Wenruo break; 122032443de3SQu Wenruo } 122132443de3SQu Wenruo 1222600a45e1SMiao Xie page_start = page_offset(page); 122309cbfeafSKirill A. Shutemov page_end = page_start + PAGE_SIZE - 1; 1224600a45e1SMiao Xie while (1) { 1225308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1226ff13db41SDavid Sterba &cached_state); 1227c3504372SNikolay Borisov ordered = btrfs_lookup_ordered_extent(BTRFS_I(inode), 1228600a45e1SMiao Xie page_start); 1229308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1230e43bbe5eSDavid Sterba &cached_state); 1231600a45e1SMiao Xie if (!ordered) 1232600a45e1SMiao Xie break; 1233600a45e1SMiao Xie 1234600a45e1SMiao Xie unlock_page(page); 1235c0a43603SNikolay Borisov btrfs_start_ordered_extent(ordered, 1); 1236600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1237600a45e1SMiao Xie lock_page(page); 12381f12bd06SLiu Bo /* 12391f12bd06SLiu Bo * we unlocked the page above, so we need check if 12401f12bd06SLiu Bo * it was released or not. 12411f12bd06SLiu Bo */ 12421f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 12431f12bd06SLiu Bo unlock_page(page); 124409cbfeafSKirill A. Shutemov put_page(page); 12451f12bd06SLiu Bo goto again; 12461f12bd06SLiu Bo } 1247600a45e1SMiao Xie } 1248600a45e1SMiao Xie 12494cb5300bSChris Mason if (!PageUptodate(page)) { 12504cb5300bSChris Mason btrfs_readpage(NULL, page); 12514cb5300bSChris Mason lock_page(page); 12524cb5300bSChris Mason if (!PageUptodate(page)) { 12534cb5300bSChris Mason unlock_page(page); 125409cbfeafSKirill A. Shutemov put_page(page); 12554cb5300bSChris Mason ret = -EIO; 12564cb5300bSChris Mason break; 12574cb5300bSChris Mason } 12584cb5300bSChris Mason } 1259600a45e1SMiao Xie 1260600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1261600a45e1SMiao Xie unlock_page(page); 126209cbfeafSKirill A. Shutemov put_page(page); 1263600a45e1SMiao Xie goto again; 1264600a45e1SMiao Xie } 1265600a45e1SMiao Xie 12664cb5300bSChris Mason pages[i] = page; 12674cb5300bSChris Mason i_done++; 12684cb5300bSChris Mason } 12694cb5300bSChris Mason if (!i_done || ret) 12704cb5300bSChris Mason goto out; 12714cb5300bSChris Mason 12721751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 12734cb5300bSChris Mason goto out; 12744cb5300bSChris Mason 12754cb5300bSChris Mason /* 12764cb5300bSChris Mason * so now we have a nice long stream of locked 12774cb5300bSChris Mason * and up to date pages, lets wait on them 12784cb5300bSChris Mason */ 12794cb5300bSChris Mason for (i = 0; i < i_done; i++) 12804cb5300bSChris Mason wait_on_page_writeback(pages[i]); 12814cb5300bSChris Mason 12824cb5300bSChris Mason page_start = page_offset(pages[0]); 128309cbfeafSKirill A. Shutemov page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE; 12844cb5300bSChris Mason 12854cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1286ff13db41SDavid Sterba page_start, page_end - 1, &cached_state); 12877f458a38SFilipe Manana 12887f458a38SFilipe Manana /* 12897f458a38SFilipe Manana * When defragmenting we skip ranges that have holes or inline extents, 12907f458a38SFilipe Manana * (check should_defrag_range()), to avoid unnecessary IO and wasting 12917f458a38SFilipe Manana * space. At btrfs_defrag_file(), we check if a range should be defragged 12927f458a38SFilipe Manana * before locking the inode and then, if it should, we trigger a sync 12937f458a38SFilipe Manana * page cache readahead - we lock the inode only after that to avoid 12947f458a38SFilipe Manana * blocking for too long other tasks that possibly want to operate on 12957f458a38SFilipe Manana * other file ranges. But before we were able to get the inode lock, 12967f458a38SFilipe Manana * some other task may have punched a hole in the range, or we may have 12977f458a38SFilipe Manana * now an inline extent, in which case we should not defrag. So check 12987f458a38SFilipe Manana * for that here, where we have the inode and the range locked, and bail 12997f458a38SFilipe Manana * out if that happened. 13007f458a38SFilipe Manana */ 13017f458a38SFilipe Manana search_start = page_start; 13027f458a38SFilipe Manana while (search_start < page_end) { 13037f458a38SFilipe Manana struct extent_map *em; 13047f458a38SFilipe Manana 13057f458a38SFilipe Manana em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, search_start, 13067f458a38SFilipe Manana page_end - search_start); 13077f458a38SFilipe Manana if (IS_ERR(em)) { 13087f458a38SFilipe Manana ret = PTR_ERR(em); 13097f458a38SFilipe Manana goto out_unlock_range; 13107f458a38SFilipe Manana } 13117f458a38SFilipe Manana if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 13127f458a38SFilipe Manana free_extent_map(em); 13137f458a38SFilipe Manana /* Ok, 0 means we did not defrag anything */ 13147f458a38SFilipe Manana ret = 0; 13157f458a38SFilipe Manana goto out_unlock_range; 13167f458a38SFilipe Manana } 13177f458a38SFilipe Manana search_start = extent_map_end(em); 13187f458a38SFilipe Manana free_extent_map(em); 13197f458a38SFilipe Manana } 13207f458a38SFilipe Manana 13214cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 1322e182163dSOmar Sandoval page_end - 1, EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 1323e182163dSOmar Sandoval EXTENT_DEFRAG, 0, 0, &cached_state); 13244cb5300bSChris Mason 13251f12bd06SLiu Bo if (i_done != page_cnt) { 13269e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 132728c4a3e2SSu Yue btrfs_mod_outstanding_extents(BTRFS_I(inode), 1); 13289e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 132986d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1330a1fbc675SMatthew Wilcox (Oracle) start, (page_cnt - i_done) << PAGE_SHIFT, true); 13314cb5300bSChris Mason } 13324cb5300bSChris Mason 13334cb5300bSChris Mason 13349e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 1335018ed4f7SDavid Sterba &cached_state); 13364cb5300bSChris Mason 13374cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 1338e43bbe5eSDavid Sterba page_start, page_end - 1, &cached_state); 13394cb5300bSChris Mason 13404cb5300bSChris Mason for (i = 0; i < i_done; i++) { 13414cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 13424cb5300bSChris Mason ClearPageChecked(pages[i]); 13434cb5300bSChris Mason set_page_dirty(pages[i]); 13444cb5300bSChris Mason unlock_page(pages[i]); 134509cbfeafSKirill A. Shutemov put_page(pages[i]); 13464cb5300bSChris Mason } 13478702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1348364ecf36SQu Wenruo extent_changeset_free(data_reserved); 13494cb5300bSChris Mason return i_done; 13507f458a38SFilipe Manana 13517f458a38SFilipe Manana out_unlock_range: 13527f458a38SFilipe Manana unlock_extent_cached(&BTRFS_I(inode)->io_tree, 13537f458a38SFilipe Manana page_start, page_end - 1, &cached_state); 13544cb5300bSChris Mason out: 13554cb5300bSChris Mason for (i = 0; i < i_done; i++) { 13564cb5300bSChris Mason unlock_page(pages[i]); 135709cbfeafSKirill A. Shutemov put_page(pages[i]); 13584cb5300bSChris Mason } 135986d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1360a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT, true); 13618702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1362364ecf36SQu Wenruo extent_changeset_free(data_reserved); 13634cb5300bSChris Mason return ret; 13644cb5300bSChris Mason 13654cb5300bSChris Mason } 13664cb5300bSChris Mason 13674cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 13684cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 13694cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 13704cb5300bSChris Mason { 13710b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 13724cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 13734cb5300bSChris Mason struct file_ra_state *ra = NULL; 13744cb5300bSChris Mason unsigned long last_index; 1375151a31b2SLi Zefan u64 isize = i_size_read(inode); 1376940100a4SChris Mason u64 last_len = 0; 1377940100a4SChris Mason u64 skip = 0; 1378940100a4SChris Mason u64 defrag_end = 0; 13794cb5300bSChris Mason u64 newer_off = range->start; 1380f46b5a66SChristoph Hellwig unsigned long i; 1381008873eaSLi Zefan unsigned long ra_index = 0; 1382f46b5a66SChristoph Hellwig int ret; 13834cb5300bSChris Mason int defrag_count = 0; 13841a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1385aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 138609cbfeafSKirill A. Shutemov unsigned long max_cluster = SZ_256K >> PAGE_SHIFT; 1387c41570c9SJustin Maggard unsigned long cluster = max_cluster; 1388ee22184bSByongho Lee u64 new_align = ~((u64)SZ_128K - 1); 13894cb5300bSChris Mason struct page **pages = NULL; 13901e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 13914cb5300bSChris Mason 13920abd5b17SLiu Bo if (isize == 0) 13930abd5b17SLiu Bo return 0; 13940abd5b17SLiu Bo 13950abd5b17SLiu Bo if (range->start >= isize) 13960abd5b17SLiu Bo return -EINVAL; 13971a419d85SLi Zefan 13981e2ef46dSDavid Sterba if (do_compress) { 1399ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 14001a419d85SLi Zefan return -EINVAL; 14011a419d85SLi Zefan if (range->compress_type) 14021a419d85SLi Zefan compress_type = range->compress_type; 14031a419d85SLi Zefan } 1404f46b5a66SChristoph Hellwig 14050abd5b17SLiu Bo if (extent_thresh == 0) 1406ee22184bSByongho Lee extent_thresh = SZ_256K; 1407f46b5a66SChristoph Hellwig 14084cb5300bSChris Mason /* 14090a52d108SDavid Sterba * If we were not given a file, allocate a readahead context. As 14100a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 14110a52d108SDavid Sterba * we don't error out. 14124cb5300bSChris Mason */ 14134cb5300bSChris Mason if (!file) { 141463e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 14150a52d108SDavid Sterba if (ra) 14164cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 14174cb5300bSChris Mason } else { 14184cb5300bSChris Mason ra = &file->f_ra; 14194cb5300bSChris Mason } 14204cb5300bSChris Mason 142163e727ecSDavid Sterba pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL); 14224cb5300bSChris Mason if (!pages) { 14234cb5300bSChris Mason ret = -ENOMEM; 14244cb5300bSChris Mason goto out_ra; 14254cb5300bSChris Mason } 14264cb5300bSChris Mason 14274cb5300bSChris Mason /* find the last page to defrag */ 14281e701a32SChris Mason if (range->start + range->len > range->start) { 1429151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 143009cbfeafSKirill A. Shutemov range->start + range->len - 1) >> PAGE_SHIFT; 14311e701a32SChris Mason } else { 143209cbfeafSKirill A. Shutemov last_index = (isize - 1) >> PAGE_SHIFT; 14331e701a32SChris Mason } 14341e701a32SChris Mason 14354cb5300bSChris Mason if (newer_than) { 14364cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 1437ee22184bSByongho Lee &newer_off, SZ_64K); 14384cb5300bSChris Mason if (!ret) { 14394cb5300bSChris Mason range->start = newer_off; 14404cb5300bSChris Mason /* 14414cb5300bSChris Mason * we always align our defrag to help keep 14424cb5300bSChris Mason * the extents in the file evenly spaced 14434cb5300bSChris Mason */ 144409cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 14454cb5300bSChris Mason } else 14464cb5300bSChris Mason goto out_ra; 14474cb5300bSChris Mason } else { 144809cbfeafSKirill A. Shutemov i = range->start >> PAGE_SHIFT; 14494cb5300bSChris Mason } 14504cb5300bSChris Mason if (!max_to_defrag) 1451070034bdSchandan max_to_defrag = last_index - i + 1; 14524cb5300bSChris Mason 14532a0f7f57SLi Zefan /* 14542a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 14552a0f7f57SLi Zefan * written sequentially. 14562a0f7f57SLi Zefan */ 14572a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 14582a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 14592a0f7f57SLi Zefan 1460f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 146109cbfeafSKirill A. Shutemov (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) { 14624cb5300bSChris Mason /* 14634cb5300bSChris Mason * make sure we stop running if someone unmounts 14644cb5300bSChris Mason * the FS 14654cb5300bSChris Mason */ 14661751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 14674cb5300bSChris Mason break; 14684cb5300bSChris Mason 14690b246afaSJeff Mahoney if (btrfs_defrag_cancelled(fs_info)) { 14700b246afaSJeff Mahoney btrfs_debug(fs_info, "defrag_file cancelled"); 1471210549ebSDavid Sterba ret = -EAGAIN; 147250535db8STian Tao goto error; 1473210549ebSDavid Sterba } 1474210549ebSDavid Sterba 147509cbfeafSKirill A. Shutemov if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT, 14766c282eb4SLi Zefan extent_thresh, &last_len, &skip, 14771e2ef46dSDavid Sterba &defrag_end, do_compress)){ 1478940100a4SChris Mason unsigned long next; 1479940100a4SChris Mason /* 1480940100a4SChris Mason * the should_defrag function tells us how much to skip 1481940100a4SChris Mason * bump our counter by the suggested amount 1482940100a4SChris Mason */ 148309cbfeafSKirill A. Shutemov next = DIV_ROUND_UP(skip, PAGE_SIZE); 1484940100a4SChris Mason i = max(i + 1, next); 1485940100a4SChris Mason continue; 1486940100a4SChris Mason } 1487008873eaSLi Zefan 1488008873eaSLi Zefan if (!newer_than) { 148909cbfeafSKirill A. Shutemov cluster = (PAGE_ALIGN(defrag_end) >> 149009cbfeafSKirill A. Shutemov PAGE_SHIFT) - i; 1491008873eaSLi Zefan cluster = min(cluster, max_cluster); 1492008873eaSLi Zefan } else { 1493008873eaSLi Zefan cluster = max_cluster; 1494008873eaSLi Zefan } 1495008873eaSLi Zefan 1496008873eaSLi Zefan if (i + cluster > ra_index) { 1497008873eaSLi Zefan ra_index = max(i, ra_index); 14980a52d108SDavid Sterba if (ra) 1499d3c0bab5SDavid Sterba page_cache_sync_readahead(inode->i_mapping, ra, 1500d3c0bab5SDavid Sterba file, ra_index, cluster); 1501e4826a5bSchandan ra_index += cluster; 1502008873eaSLi Zefan } 15034cb5300bSChris Mason 150464708539SJosef Bacik btrfs_inode_lock(inode, 0); 1505eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1506eede2bf3SOmar Sandoval ret = -ETXTBSY; 1507eede2bf3SOmar Sandoval } else { 15081e2ef46dSDavid Sterba if (do_compress) 1509eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 1510008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1511eede2bf3SOmar Sandoval } 1512ecb8bea8SLiu Bo if (ret < 0) { 151364708539SJosef Bacik btrfs_inode_unlock(inode, 0); 15144cb5300bSChris Mason goto out_ra; 1515ecb8bea8SLiu Bo } 15164cb5300bSChris Mason 15174cb5300bSChris Mason defrag_count += ret; 1518d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 151964708539SJosef Bacik btrfs_inode_unlock(inode, 0); 15204cb5300bSChris Mason 15214cb5300bSChris Mason if (newer_than) { 15224cb5300bSChris Mason if (newer_off == (u64)-1) 15234cb5300bSChris Mason break; 15244cb5300bSChris Mason 1525e1f041e1SLiu Bo if (ret > 0) 1526e1f041e1SLiu Bo i += ret; 1527e1f041e1SLiu Bo 15284cb5300bSChris Mason newer_off = max(newer_off + 1, 152909cbfeafSKirill A. Shutemov (u64)i << PAGE_SHIFT); 15304cb5300bSChris Mason 1531ee22184bSByongho Lee ret = find_new_extents(root, inode, newer_than, 1532ee22184bSByongho Lee &newer_off, SZ_64K); 15334cb5300bSChris Mason if (!ret) { 15344cb5300bSChris Mason range->start = newer_off; 153509cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 15364cb5300bSChris Mason } else { 15374cb5300bSChris Mason break; 1538940100a4SChris Mason } 15394cb5300bSChris Mason } else { 1540008873eaSLi Zefan if (ret > 0) { 1541cbcc8326SLi Zefan i += ret; 154209cbfeafSKirill A. Shutemov last_len += ret << PAGE_SHIFT; 1543008873eaSLi Zefan } else { 1544940100a4SChris Mason i++; 1545008873eaSLi Zefan last_len = 0; 1546008873eaSLi Zefan } 1547f46b5a66SChristoph Hellwig } 15484cb5300bSChris Mason } 1549f46b5a66SChristoph Hellwig 155050535db8STian Tao ret = defrag_count; 155150535db8STian Tao error: 1552dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 15531e701a32SChris Mason filemap_flush(inode->i_mapping); 1554dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1555dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1556dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1557dec8ef90SFilipe Manana } 15581e701a32SChris Mason 15591a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 15600b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 15615c1aab1dSNick Terrell } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) { 15625c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 15631a419d85SLi Zefan } 15641a419d85SLi Zefan 15654cb5300bSChris Mason out_ra: 15661e2ef46dSDavid Sterba if (do_compress) { 156764708539SJosef Bacik btrfs_inode_lock(inode, 0); 1568eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 156964708539SJosef Bacik btrfs_inode_unlock(inode, 0); 1570633085c7SFilipe David Borba Manana } 15714cb5300bSChris Mason if (!file) 15724cb5300bSChris Mason kfree(ra); 15734cb5300bSChris Mason kfree(pages); 1574940100a4SChris Mason return ret; 1575f46b5a66SChristoph Hellwig } 1576f46b5a66SChristoph Hellwig 1577198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 157876dda93cSYan, Zheng void __user *arg) 1579f46b5a66SChristoph Hellwig { 15800b246afaSJeff Mahoney struct inode *inode = file_inode(file); 15810b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1582f46b5a66SChristoph Hellwig u64 new_size; 1583f46b5a66SChristoph Hellwig u64 old_size; 1584f46b5a66SChristoph Hellwig u64 devid = 1; 15850b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1586f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1587f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1588f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1589f46b5a66SChristoph Hellwig char *sizestr; 15909a40f122SGui Hecheng char *retptr; 1591f46b5a66SChristoph Hellwig char *devstr = NULL; 1592f46b5a66SChristoph Hellwig int ret = 0; 1593f46b5a66SChristoph Hellwig int mod = 0; 1594f46b5a66SChristoph Hellwig 1595e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1596e441d54dSChris Mason return -EPERM; 1597e441d54dSChris Mason 1598198605a8SMiao Xie ret = mnt_want_write_file(file); 1599198605a8SMiao Xie if (ret) 1600198605a8SMiao Xie return ret; 1601198605a8SMiao Xie 1602c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_RESIZE)) { 160397547676SMiao Xie mnt_drop_write_file(file); 1604e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1605c9e9f97bSIlya Dryomov } 1606c9e9f97bSIlya Dryomov 1607dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1608c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1609c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1610c9e9f97bSIlya Dryomov goto out; 1611c9e9f97bSIlya Dryomov } 16125516e595SMark Fasheh 16135516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1614f46b5a66SChristoph Hellwig 1615f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1616f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1617f46b5a66SChristoph Hellwig if (devstr) { 1618f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1619f46b5a66SChristoph Hellwig *devstr = '\0'; 1620f46b5a66SChristoph Hellwig devstr = vol_args->name; 162158dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 162258dfae63SZhangZhen if (ret) 162358dfae63SZhangZhen goto out_free; 1624dfd79829SMiao Xie if (!devid) { 1625dfd79829SMiao Xie ret = -EINVAL; 1626dfd79829SMiao Xie goto out_free; 1627dfd79829SMiao Xie } 16280b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1629f46b5a66SChristoph Hellwig } 1630dba60f3fSMiao Xie 1631b2598edfSAnand Jain device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL); 1632f46b5a66SChristoph Hellwig if (!device) { 16330b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1634c1c9ff7cSGeert Uytterhoeven devid); 1635dfd79829SMiao Xie ret = -ENODEV; 1636c9e9f97bSIlya Dryomov goto out_free; 1637f46b5a66SChristoph Hellwig } 1638dba60f3fSMiao Xie 1639ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 16400b246afaSJeff Mahoney btrfs_info(fs_info, 1641efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1642c1c9ff7cSGeert Uytterhoeven devid); 1643dfd79829SMiao Xie ret = -EPERM; 16444e42ae1bSLiu Bo goto out_free; 16454e42ae1bSLiu Bo } 16464e42ae1bSLiu Bo 1647f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1648f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1649f46b5a66SChristoph Hellwig else { 1650f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1651f46b5a66SChristoph Hellwig mod = -1; 1652f46b5a66SChristoph Hellwig sizestr++; 1653f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1654f46b5a66SChristoph Hellwig mod = 1; 1655f46b5a66SChristoph Hellwig sizestr++; 1656f46b5a66SChristoph Hellwig } 16579a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 16589a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1659f46b5a66SChristoph Hellwig ret = -EINVAL; 1660c9e9f97bSIlya Dryomov goto out_free; 1661f46b5a66SChristoph Hellwig } 1662f46b5a66SChristoph Hellwig } 1663f46b5a66SChristoph Hellwig 1664401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1665dfd79829SMiao Xie ret = -EPERM; 166663a212abSStefan Behrens goto out_free; 166763a212abSStefan Behrens } 166863a212abSStefan Behrens 16697cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1670f46b5a66SChristoph Hellwig 1671f46b5a66SChristoph Hellwig if (mod < 0) { 1672f46b5a66SChristoph Hellwig if (new_size > old_size) { 1673f46b5a66SChristoph Hellwig ret = -EINVAL; 1674c9e9f97bSIlya Dryomov goto out_free; 1675f46b5a66SChristoph Hellwig } 1676f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1677f46b5a66SChristoph Hellwig } else if (mod > 0) { 1678eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1679902c68a4SGui Hecheng ret = -ERANGE; 1680eb8052e0SWenliang Fan goto out_free; 1681eb8052e0SWenliang Fan } 1682f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1683f46b5a66SChristoph Hellwig } 1684f46b5a66SChristoph Hellwig 1685ee22184bSByongho Lee if (new_size < SZ_256M) { 1686f46b5a66SChristoph Hellwig ret = -EINVAL; 1687c9e9f97bSIlya Dryomov goto out_free; 1688f46b5a66SChristoph Hellwig } 1689f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1690f46b5a66SChristoph Hellwig ret = -EFBIG; 1691c9e9f97bSIlya Dryomov goto out_free; 1692f46b5a66SChristoph Hellwig } 1693f46b5a66SChristoph Hellwig 169447f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1695f46b5a66SChristoph Hellwig 1696f46b5a66SChristoph Hellwig if (new_size > old_size) { 1697a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 169898d5dc13STsutomu Itoh if (IS_ERR(trans)) { 169998d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1700c9e9f97bSIlya Dryomov goto out_free; 170198d5dc13STsutomu Itoh } 1702f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 17033a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1704ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1705f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 17060253f40eSjeff.liu } /* equal, nothing need to do */ 1707f46b5a66SChristoph Hellwig 1708faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1709faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1710faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1711faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 1712faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1713c9e9f97bSIlya Dryomov out_free: 1714f46b5a66SChristoph Hellwig kfree(vol_args); 1715c9e9f97bSIlya Dryomov out: 1716c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 171718f39c41SIlya Dryomov mnt_drop_write_file(file); 1718f46b5a66SChristoph Hellwig return ret; 1719f46b5a66SChristoph Hellwig } 1720f46b5a66SChristoph Hellwig 17215d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 172252f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 17235d54c67eSNikolay Borisov bool readonly, 17248696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1725f46b5a66SChristoph Hellwig { 1726f46b5a66SChristoph Hellwig int namelen; 17273de4586cSChris Mason int ret = 0; 1728f46b5a66SChristoph Hellwig 1729325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1730325c50e3SJeff Mahoney return -ENOTDIR; 1731325c50e3SJeff Mahoney 1732a874a63eSLiu Bo ret = mnt_want_write_file(file); 1733a874a63eSLiu Bo if (ret) 1734a874a63eSLiu Bo goto out; 1735a874a63eSLiu Bo 173672fd032eSSage Weil namelen = strlen(name); 173772fd032eSSage Weil if (strchr(name, '/')) { 1738f46b5a66SChristoph Hellwig ret = -EINVAL; 1739a874a63eSLiu Bo goto out_drop_write; 1740f46b5a66SChristoph Hellwig } 1741f46b5a66SChristoph Hellwig 174216780cabSChris Mason if (name[0] == '.' && 174316780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 174416780cabSChris Mason ret = -EEXIST; 1745a874a63eSLiu Bo goto out_drop_write; 174616780cabSChris Mason } 174716780cabSChris Mason 17483de4586cSChris Mason if (subvol) { 174972fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 17505d54c67eSNikolay Borisov NULL, readonly, inherit); 1751cb8e7090SChristoph Hellwig } else { 17522903ff01SAl Viro struct fd src = fdget(fd); 17533de4586cSChris Mason struct inode *src_inode; 17542903ff01SAl Viro if (!src.file) { 17553de4586cSChris Mason ret = -EINVAL; 1756a874a63eSLiu Bo goto out_drop_write; 17573de4586cSChris Mason } 17583de4586cSChris Mason 1759496ad9aaSAl Viro src_inode = file_inode(src.file); 1760496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1761c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1762efe120a0SFrank Holton "Snapshot src from another FS"); 176323ad5b17SKusanagi Kouichi ret = -EXDEV; 176421cb47beSChristian Brauner } else if (!inode_owner_or_capable(&init_user_ns, src_inode)) { 1765d0242061SDavid Sterba /* 1766d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1767d0242061SDavid Sterba * are limited to own subvolumes only 1768d0242061SDavid Sterba */ 1769d0242061SDavid Sterba ret = -EPERM; 1770ecd18815SAl Viro } else { 1771c11fbb6eSRobbie Ko ret = btrfs_mksnapshot(&file->f_path, name, namelen, 177272fd032eSSage Weil BTRFS_I(src_inode)->root, 17735d54c67eSNikolay Borisov readonly, inherit); 1774ecd18815SAl Viro } 17752903ff01SAl Viro fdput(src); 1776cb8e7090SChristoph Hellwig } 1777a874a63eSLiu Bo out_drop_write: 1778a874a63eSLiu Bo mnt_drop_write_file(file); 1779f46b5a66SChristoph Hellwig out: 178072fd032eSSage Weil return ret; 178172fd032eSSage Weil } 178272fd032eSSage Weil 178372fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1784fa0d2b9bSLi Zefan void __user *arg, int subvol) 178572fd032eSSage Weil { 1786fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 178772fd032eSSage Weil int ret; 178872fd032eSSage Weil 1789325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1790325c50e3SJeff Mahoney return -ENOTDIR; 1791325c50e3SJeff Mahoney 1792fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1793fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1794fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1795fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1796fa0d2b9bSLi Zefan 17975d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 17985d54c67eSNikolay Borisov subvol, false, NULL); 1799fa0d2b9bSLi Zefan 1800fa0d2b9bSLi Zefan kfree(vol_args); 1801fa0d2b9bSLi Zefan return ret; 1802fa0d2b9bSLi Zefan } 1803fa0d2b9bSLi Zefan 1804fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1805fa0d2b9bSLi Zefan void __user *arg, int subvol) 1806fa0d2b9bSLi Zefan { 1807fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1808fa0d2b9bSLi Zefan int ret; 1809b83cc969SLi Zefan bool readonly = false; 18106f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 181172fd032eSSage Weil 1812325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1813325c50e3SJeff Mahoney return -ENOTDIR; 1814325c50e3SJeff Mahoney 1815fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1816fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1817fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1818fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1819fdfb1e4fSLi Zefan 1820673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 1821b83cc969SLi Zefan ret = -EOPNOTSUPP; 1822c47ca32dSDan Carpenter goto free_args; 1823fdfb1e4fSLi Zefan } 1824fdfb1e4fSLi Zefan 1825b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1826b83cc969SLi Zefan readonly = true; 18276f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 18285011c5a6SDan Carpenter u64 nums; 18295011c5a6SDan Carpenter 18305011c5a6SDan Carpenter if (vol_args->size < sizeof(*inherit) || 18315011c5a6SDan Carpenter vol_args->size > PAGE_SIZE) { 18326f72c7e2SArne Jansen ret = -EINVAL; 1833c47ca32dSDan Carpenter goto free_args; 18346f72c7e2SArne Jansen } 18356f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 18366f72c7e2SArne Jansen if (IS_ERR(inherit)) { 18376f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1838c47ca32dSDan Carpenter goto free_args; 18396f72c7e2SArne Jansen } 18405011c5a6SDan Carpenter 18415011c5a6SDan Carpenter if (inherit->num_qgroups > PAGE_SIZE || 18425011c5a6SDan Carpenter inherit->num_ref_copies > PAGE_SIZE || 18435011c5a6SDan Carpenter inherit->num_excl_copies > PAGE_SIZE) { 18445011c5a6SDan Carpenter ret = -EINVAL; 18455011c5a6SDan Carpenter goto free_inherit; 18465011c5a6SDan Carpenter } 18475011c5a6SDan Carpenter 18485011c5a6SDan Carpenter nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + 18495011c5a6SDan Carpenter 2 * inherit->num_excl_copies; 18505011c5a6SDan Carpenter if (vol_args->size != struct_size(inherit, qgroups, nums)) { 18515011c5a6SDan Carpenter ret = -EINVAL; 18525011c5a6SDan Carpenter goto free_inherit; 18535011c5a6SDan Carpenter } 18546f72c7e2SArne Jansen } 185575eaa0e2SSage Weil 18565d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 18575d54c67eSNikolay Borisov subvol, readonly, inherit); 1858c47ca32dSDan Carpenter if (ret) 1859c47ca32dSDan Carpenter goto free_inherit; 1860c47ca32dSDan Carpenter free_inherit: 18616f72c7e2SArne Jansen kfree(inherit); 1862c47ca32dSDan Carpenter free_args: 1863c47ca32dSDan Carpenter kfree(vol_args); 1864f46b5a66SChristoph Hellwig return ret; 1865f46b5a66SChristoph Hellwig } 1866f46b5a66SChristoph Hellwig 18670caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 18680caa102dSLi Zefan void __user *arg) 18690caa102dSLi Zefan { 1870496ad9aaSAl Viro struct inode *inode = file_inode(file); 18710b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 18720caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 18730caa102dSLi Zefan int ret = 0; 18740caa102dSLi Zefan u64 flags = 0; 18750caa102dSLi Zefan 18764a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 18770caa102dSLi Zefan return -EINVAL; 18780caa102dSLi Zefan 18790b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 18800caa102dSLi Zefan if (btrfs_root_readonly(root)) 18810caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 18820b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 18830caa102dSLi Zefan 18840caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 18850caa102dSLi Zefan ret = -EFAULT; 18860caa102dSLi Zefan 18870caa102dSLi Zefan return ret; 18880caa102dSLi Zefan } 18890caa102dSLi Zefan 18900caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 18910caa102dSLi Zefan void __user *arg) 18920caa102dSLi Zefan { 1893496ad9aaSAl Viro struct inode *inode = file_inode(file); 18940b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 18950caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 18960caa102dSLi Zefan struct btrfs_trans_handle *trans; 18970caa102dSLi Zefan u64 root_flags; 18980caa102dSLi Zefan u64 flags; 18990caa102dSLi Zefan int ret = 0; 19000caa102dSLi Zefan 190121cb47beSChristian Brauner if (!inode_owner_or_capable(&init_user_ns, inode)) 1902bd60ea0fSDavid Sterba return -EPERM; 1903bd60ea0fSDavid Sterba 1904b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1905b9ca0664SLiu Bo if (ret) 1906b9ca0664SLiu Bo goto out; 19070caa102dSLi Zefan 19084a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 1909b9ca0664SLiu Bo ret = -EINVAL; 1910b9ca0664SLiu Bo goto out_drop_write; 1911b9ca0664SLiu Bo } 19120caa102dSLi Zefan 1913b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1914b9ca0664SLiu Bo ret = -EFAULT; 1915b9ca0664SLiu Bo goto out_drop_write; 1916b9ca0664SLiu Bo } 19170caa102dSLi Zefan 1918b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1919b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1920b9ca0664SLiu Bo goto out_drop_write; 1921b9ca0664SLiu Bo } 19220caa102dSLi Zefan 19230b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 19240caa102dSLi Zefan 19250caa102dSLi Zefan /* nothing to do */ 19260caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1927b9ca0664SLiu Bo goto out_drop_sem; 19280caa102dSLi Zefan 19290caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 19302c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 19310caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 19320caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 19332c686537SDavid Sterba } else { 19342c686537SDavid Sterba /* 19352c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 19362c686537SDavid Sterba * send 19372c686537SDavid Sterba */ 19382c686537SDavid Sterba spin_lock(&root->root_item_lock); 19392c686537SDavid Sterba if (root->send_in_progress == 0) { 19400caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 19410caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 19422c686537SDavid Sterba spin_unlock(&root->root_item_lock); 19432c686537SDavid Sterba } else { 19442c686537SDavid Sterba spin_unlock(&root->root_item_lock); 19450b246afaSJeff Mahoney btrfs_warn(fs_info, 19462c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 19472c686537SDavid Sterba root->root_key.objectid); 19482c686537SDavid Sterba ret = -EPERM; 19492c686537SDavid Sterba goto out_drop_sem; 19502c686537SDavid Sterba } 19512c686537SDavid Sterba } 19520caa102dSLi Zefan 19530caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 19540caa102dSLi Zefan if (IS_ERR(trans)) { 19550caa102dSLi Zefan ret = PTR_ERR(trans); 19560caa102dSLi Zefan goto out_reset; 19570caa102dSLi Zefan } 19580caa102dSLi Zefan 19590b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 19600caa102dSLi Zefan &root->root_key, &root->root_item); 19619417ebc8SNikolay Borisov if (ret < 0) { 19629417ebc8SNikolay Borisov btrfs_end_transaction(trans); 19639417ebc8SNikolay Borisov goto out_reset; 19649417ebc8SNikolay Borisov } 19650caa102dSLi Zefan 19669417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 19679417ebc8SNikolay Borisov 19680caa102dSLi Zefan out_reset: 19690caa102dSLi Zefan if (ret) 19700caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1971b9ca0664SLiu Bo out_drop_sem: 19720b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 1973b9ca0664SLiu Bo out_drop_write: 1974b9ca0664SLiu Bo mnt_drop_write_file(file); 1975b9ca0664SLiu Bo out: 19760caa102dSLi Zefan return ret; 19770caa102dSLi Zefan } 19780caa102dSLi Zefan 1979ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1980ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1981ac8e9819SChris Mason { 1982abc6e134SChris Mason struct btrfs_key test; 1983abc6e134SChris Mason int ret; 1984abc6e134SChris Mason 1985abc6e134SChris Mason test.objectid = sk->min_objectid; 1986abc6e134SChris Mason test.type = sk->min_type; 1987abc6e134SChris Mason test.offset = sk->min_offset; 1988abc6e134SChris Mason 1989abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1990abc6e134SChris Mason if (ret < 0) 1991ac8e9819SChris Mason return 0; 1992abc6e134SChris Mason 1993abc6e134SChris Mason test.objectid = sk->max_objectid; 1994abc6e134SChris Mason test.type = sk->max_type; 1995abc6e134SChris Mason test.offset = sk->max_offset; 1996abc6e134SChris Mason 1997abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1998abc6e134SChris Mason if (ret > 0) 1999ac8e9819SChris Mason return 0; 2000ac8e9819SChris Mason return 1; 2001ac8e9819SChris Mason } 2002ac8e9819SChris Mason 2003df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2004ac8e9819SChris Mason struct btrfs_key *key, 2005ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 20069b6e817dSGerhard Heift size_t *buf_size, 2007ba346b35SGerhard Heift char __user *ubuf, 2008ac8e9819SChris Mason unsigned long *sk_offset, 2009ac8e9819SChris Mason int *num_found) 2010ac8e9819SChris Mason { 2011ac8e9819SChris Mason u64 found_transid; 2012ac8e9819SChris Mason struct extent_buffer *leaf; 2013ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2014dd81d459SNaohiro Aota struct btrfs_key test; 2015ac8e9819SChris Mason unsigned long item_off; 2016ac8e9819SChris Mason unsigned long item_len; 2017ac8e9819SChris Mason int nritems; 2018ac8e9819SChris Mason int i; 2019ac8e9819SChris Mason int slot; 2020ac8e9819SChris Mason int ret = 0; 2021ac8e9819SChris Mason 2022ac8e9819SChris Mason leaf = path->nodes[0]; 2023ac8e9819SChris Mason slot = path->slots[0]; 2024ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2025ac8e9819SChris Mason 2026ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2027ac8e9819SChris Mason i = nritems; 2028ac8e9819SChris Mason goto advance_key; 2029ac8e9819SChris Mason } 2030ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2031ac8e9819SChris Mason 2032ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2033ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 2034ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 2035ac8e9819SChris Mason 203603b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 203703b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 203803b71c6cSGabriel de Perthuis continue; 203903b71c6cSGabriel de Perthuis 20409b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 20418f5f6178SGerhard Heift if (*num_found) { 2042ac8e9819SChris Mason ret = 1; 20438f5f6178SGerhard Heift goto out; 20448f5f6178SGerhard Heift } 20458f5f6178SGerhard Heift 20468f5f6178SGerhard Heift /* 20478f5f6178SGerhard Heift * return one empty item back for v1, which does not 20488f5f6178SGerhard Heift * handle -EOVERFLOW 20498f5f6178SGerhard Heift */ 20508f5f6178SGerhard Heift 20519b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2052ac8e9819SChris Mason item_len = 0; 20538f5f6178SGerhard Heift ret = -EOVERFLOW; 20548f5f6178SGerhard Heift } 2055ac8e9819SChris Mason 20569b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2057ac8e9819SChris Mason ret = 1; 205825c9bc2eSGerhard Heift goto out; 2059ac8e9819SChris Mason } 2060ac8e9819SChris Mason 2061ac8e9819SChris Mason sh.objectid = key->objectid; 2062ac8e9819SChris Mason sh.offset = key->offset; 2063ac8e9819SChris Mason sh.type = key->type; 2064ac8e9819SChris Mason sh.len = item_len; 2065ac8e9819SChris Mason sh.transid = found_transid; 2066ac8e9819SChris Mason 2067a48b73ecSJosef Bacik /* 2068a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 2069a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 2070a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 2071a48b73ecSJosef Bacik * properly this next time through 2072a48b73ecSJosef Bacik */ 2073a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 2074a48b73ecSJosef Bacik ret = 0; 2075ba346b35SGerhard Heift goto out; 2076ba346b35SGerhard Heift } 2077ba346b35SGerhard Heift 2078ac8e9819SChris Mason *sk_offset += sizeof(sh); 2079ac8e9819SChris Mason 2080ac8e9819SChris Mason if (item_len) { 2081ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2082a48b73ecSJosef Bacik /* 2083a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 2084a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 2085a48b73ecSJosef Bacik */ 2086a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 2087ba346b35SGerhard Heift item_off, item_len)) { 2088a48b73ecSJosef Bacik ret = 0; 2089a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 2090ba346b35SGerhard Heift goto out; 2091ba346b35SGerhard Heift } 2092ba346b35SGerhard Heift 2093ac8e9819SChris Mason *sk_offset += item_len; 2094ac8e9819SChris Mason } 2095e2156867SHugo Mills (*num_found)++; 2096ac8e9819SChris Mason 20978f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 20988f5f6178SGerhard Heift goto out; 20998f5f6178SGerhard Heift 210025c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 210125c9bc2eSGerhard Heift ret = 1; 210225c9bc2eSGerhard Heift goto out; 210325c9bc2eSGerhard Heift } 2104ac8e9819SChris Mason } 2105ac8e9819SChris Mason advance_key: 2106ac8e9819SChris Mason ret = 0; 2107dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2108dd81d459SNaohiro Aota test.type = sk->max_type; 2109dd81d459SNaohiro Aota test.offset = sk->max_offset; 2110dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2111dd81d459SNaohiro Aota ret = 1; 2112dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2113abc6e134SChris Mason key->offset++; 2114dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2115abc6e134SChris Mason key->offset = 0; 2116abc6e134SChris Mason key->type++; 2117dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2118abc6e134SChris Mason key->offset = 0; 2119abc6e134SChris Mason key->type = 0; 2120abc6e134SChris Mason key->objectid++; 2121abc6e134SChris Mason } else 2122abc6e134SChris Mason ret = 1; 212325c9bc2eSGerhard Heift out: 2124ba346b35SGerhard Heift /* 2125ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2126ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2127ba346b35SGerhard Heift * * all items were found 2128ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2129ba346b35SGerhard Heift * leaf 2130ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2131ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2132ba346b35SGerhard Heift */ 2133ac8e9819SChris Mason return ret; 2134ac8e9819SChris Mason } 2135ac8e9819SChris Mason 2136ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 213712544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 21389b6e817dSGerhard Heift size_t *buf_size, 2139ba346b35SGerhard Heift char __user *ubuf) 2140ac8e9819SChris Mason { 21410b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2142ac8e9819SChris Mason struct btrfs_root *root; 2143ac8e9819SChris Mason struct btrfs_key key; 2144ac8e9819SChris Mason struct btrfs_path *path; 2145ac8e9819SChris Mason int ret; 2146ac8e9819SChris Mason int num_found = 0; 2147ac8e9819SChris Mason unsigned long sk_offset = 0; 2148ac8e9819SChris Mason 21499b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 21509b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 215112544442SGerhard Heift return -EOVERFLOW; 21529b6e817dSGerhard Heift } 215312544442SGerhard Heift 2154ac8e9819SChris Mason path = btrfs_alloc_path(); 2155ac8e9819SChris Mason if (!path) 2156ac8e9819SChris Mason return -ENOMEM; 2157ac8e9819SChris Mason 2158ac8e9819SChris Mason if (sk->tree_id == 0) { 2159ac8e9819SChris Mason /* search the root of the inode that was passed */ 216000246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2161ac8e9819SChris Mason } else { 216256e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2163ac8e9819SChris Mason if (IS_ERR(root)) { 2164ac8e9819SChris Mason btrfs_free_path(path); 2165ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2166ac8e9819SChris Mason } 2167ac8e9819SChris Mason } 2168ac8e9819SChris Mason 2169ac8e9819SChris Mason key.objectid = sk->min_objectid; 2170ac8e9819SChris Mason key.type = sk->min_type; 2171ac8e9819SChris Mason key.offset = sk->min_offset; 2172ac8e9819SChris Mason 2173ac8e9819SChris Mason while (1) { 21741c78544eSFilipe Manana ret = fault_in_pages_writeable(ubuf + sk_offset, 21751c78544eSFilipe Manana *buf_size - sk_offset); 2176a48b73ecSJosef Bacik if (ret) 2177a48b73ecSJosef Bacik break; 2178a48b73ecSJosef Bacik 21796174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2180ac8e9819SChris Mason if (ret != 0) { 2181ac8e9819SChris Mason if (ret > 0) 2182ac8e9819SChris Mason ret = 0; 2183ac8e9819SChris Mason goto err; 2184ac8e9819SChris Mason } 2185df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2186ac8e9819SChris Mason &sk_offset, &num_found); 2187b3b4aa74SDavid Sterba btrfs_release_path(path); 218825c9bc2eSGerhard Heift if (ret) 2189ac8e9819SChris Mason break; 2190ac8e9819SChris Mason 2191ac8e9819SChris Mason } 21928f5f6178SGerhard Heift if (ret > 0) 2193ac8e9819SChris Mason ret = 0; 2194ac8e9819SChris Mason err: 2195ac8e9819SChris Mason sk->nr_items = num_found; 219600246528SJosef Bacik btrfs_put_root(root); 2197ac8e9819SChris Mason btrfs_free_path(path); 2198ac8e9819SChris Mason return ret; 2199ac8e9819SChris Mason } 2200ac8e9819SChris Mason 2201ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2202ac8e9819SChris Mason void __user *argp) 2203ac8e9819SChris Mason { 2204ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2205ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2206ac8e9819SChris Mason struct inode *inode; 2207ac8e9819SChris Mason int ret; 22089b6e817dSGerhard Heift size_t buf_size; 2209ac8e9819SChris Mason 2210ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2211ac8e9819SChris Mason return -EPERM; 2212ac8e9819SChris Mason 2213ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2214ac8e9819SChris Mason 2215ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2216ba346b35SGerhard Heift return -EFAULT; 2217ba346b35SGerhard Heift 2218ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2219ac8e9819SChris Mason 2220496ad9aaSAl Viro inode = file_inode(file); 2221ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 22228f5f6178SGerhard Heift 22238f5f6178SGerhard Heift /* 22248f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 22258f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 22268f5f6178SGerhard Heift */ 22278f5f6178SGerhard Heift if (ret == -EOVERFLOW) 22288f5f6178SGerhard Heift ret = 0; 22298f5f6178SGerhard Heift 2230ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2231ac8e9819SChris Mason ret = -EFAULT; 2232ac8e9819SChris Mason return ret; 2233ac8e9819SChris Mason } 2234ac8e9819SChris Mason 2235cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2236cc68a8a5SGerhard Heift void __user *argp) 2237cc68a8a5SGerhard Heift { 2238cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2239cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2240cc68a8a5SGerhard Heift struct inode *inode; 2241cc68a8a5SGerhard Heift int ret; 2242cc68a8a5SGerhard Heift size_t buf_size; 2243ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2244cc68a8a5SGerhard Heift 2245cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2246cc68a8a5SGerhard Heift return -EPERM; 2247cc68a8a5SGerhard Heift 2248cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2249cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2250cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2251cc68a8a5SGerhard Heift return -EFAULT; 2252cc68a8a5SGerhard Heift 2253cc68a8a5SGerhard Heift buf_size = args.buf_size; 2254cc68a8a5SGerhard Heift 2255cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2256cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2257cc68a8a5SGerhard Heift buf_size = buf_limit; 2258cc68a8a5SGerhard Heift 2259cc68a8a5SGerhard Heift inode = file_inode(file); 2260cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2261718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2262cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2263cc68a8a5SGerhard Heift ret = -EFAULT; 2264cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2265cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2266cc68a8a5SGerhard Heift ret = -EFAULT; 2267cc68a8a5SGerhard Heift 226876dda93cSYan, Zheng return ret; 226976dda93cSYan, Zheng } 227076dda93cSYan, Zheng 227198d377a0STARUISI Hiroaki /* 2272ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2273ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 227498d377a0STARUISI Hiroaki */ 227598d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 227698d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 227798d377a0STARUISI Hiroaki { 227898d377a0STARUISI Hiroaki struct btrfs_root *root; 227998d377a0STARUISI Hiroaki struct btrfs_key key; 2280ac8e9819SChris Mason char *ptr; 228198d377a0STARUISI Hiroaki int ret = -1; 228298d377a0STARUISI Hiroaki int slot; 228398d377a0STARUISI Hiroaki int len; 228498d377a0STARUISI Hiroaki int total_len = 0; 228598d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 228698d377a0STARUISI Hiroaki struct extent_buffer *l; 228798d377a0STARUISI Hiroaki struct btrfs_path *path; 228898d377a0STARUISI Hiroaki 228998d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 229098d377a0STARUISI Hiroaki name[0]='\0'; 229198d377a0STARUISI Hiroaki return 0; 229298d377a0STARUISI Hiroaki } 229398d377a0STARUISI Hiroaki 229498d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 229598d377a0STARUISI Hiroaki if (!path) 229698d377a0STARUISI Hiroaki return -ENOMEM; 229798d377a0STARUISI Hiroaki 2298c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 229998d377a0STARUISI Hiroaki 230056e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 230198d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2302ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 230388234012SJosef Bacik root = NULL; 230488234012SJosef Bacik goto out; 230588234012SJosef Bacik } 230698d377a0STARUISI Hiroaki 230798d377a0STARUISI Hiroaki key.objectid = dirid; 230898d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 23098ad6fcabSChris Mason key.offset = (u64)-1; 231098d377a0STARUISI Hiroaki 231198d377a0STARUISI Hiroaki while (1) { 231298d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 231398d377a0STARUISI Hiroaki if (ret < 0) 231498d377a0STARUISI Hiroaki goto out; 231518674c6cSFilipe David Borba Manana else if (ret > 0) { 231618674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 231718674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 231818674c6cSFilipe David Borba Manana if (ret < 0) 231918674c6cSFilipe David Borba Manana goto out; 232018674c6cSFilipe David Borba Manana else if (ret > 0) { 2321ac8e9819SChris Mason ret = -ENOENT; 232298d377a0STARUISI Hiroaki goto out; 2323ac8e9819SChris Mason } 232418674c6cSFilipe David Borba Manana } 232518674c6cSFilipe David Borba Manana 232618674c6cSFilipe David Borba Manana l = path->nodes[0]; 232718674c6cSFilipe David Borba Manana slot = path->slots[0]; 232818674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 232998d377a0STARUISI Hiroaki 233098d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 233198d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 233298d377a0STARUISI Hiroaki ptr -= len + 1; 233398d377a0STARUISI Hiroaki total_len += len + 1; 2334a696cf35SFilipe David Borba Manana if (ptr < name) { 2335a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 233698d377a0STARUISI Hiroaki goto out; 2337a696cf35SFilipe David Borba Manana } 233898d377a0STARUISI Hiroaki 233998d377a0STARUISI Hiroaki *(ptr + len) = '/'; 234098d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 234198d377a0STARUISI Hiroaki 234298d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 234398d377a0STARUISI Hiroaki break; 234498d377a0STARUISI Hiroaki 2345b3b4aa74SDavid Sterba btrfs_release_path(path); 234698d377a0STARUISI Hiroaki key.objectid = key.offset; 23478ad6fcabSChris Mason key.offset = (u64)-1; 234898d377a0STARUISI Hiroaki dirid = key.objectid; 234998d377a0STARUISI Hiroaki } 235077906a50SLi Zefan memmove(name, ptr, total_len); 235198d377a0STARUISI Hiroaki name[total_len] = '\0'; 235298d377a0STARUISI Hiroaki ret = 0; 235398d377a0STARUISI Hiroaki out: 235400246528SJosef Bacik btrfs_put_root(root); 235598d377a0STARUISI Hiroaki btrfs_free_path(path); 2356ac8e9819SChris Mason return ret; 2357ac8e9819SChris Mason } 2358ac8e9819SChris Mason 235923d0b79dSTomohiro Misono static int btrfs_search_path_in_tree_user(struct inode *inode, 236023d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 236123d0b79dSTomohiro Misono { 236223d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 236323d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 236423d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 236523d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 236623d0b79dSTomohiro Misono u64 dirid = args->dirid; 236723d0b79dSTomohiro Misono unsigned long item_off; 236823d0b79dSTomohiro Misono unsigned long item_len; 236923d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 237023d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2371b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 237223d0b79dSTomohiro Misono struct btrfs_path *path; 237323d0b79dSTomohiro Misono struct btrfs_key key, key2; 237423d0b79dSTomohiro Misono struct extent_buffer *leaf; 237523d0b79dSTomohiro Misono struct inode *temp_inode; 237623d0b79dSTomohiro Misono char *ptr; 237723d0b79dSTomohiro Misono int slot; 237823d0b79dSTomohiro Misono int len; 237923d0b79dSTomohiro Misono int total_len = 0; 238023d0b79dSTomohiro Misono int ret; 238123d0b79dSTomohiro Misono 238223d0b79dSTomohiro Misono path = btrfs_alloc_path(); 238323d0b79dSTomohiro Misono if (!path) 238423d0b79dSTomohiro Misono return -ENOMEM; 238523d0b79dSTomohiro Misono 238623d0b79dSTomohiro Misono /* 238723d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 238823d0b79dSTomohiro Misono * construct the path in from the bottom up. 238923d0b79dSTomohiro Misono */ 239023d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 239123d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 239223d0b79dSTomohiro Misono 239356e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 239423d0b79dSTomohiro Misono if (IS_ERR(root)) { 239523d0b79dSTomohiro Misono ret = PTR_ERR(root); 239623d0b79dSTomohiro Misono goto out; 239723d0b79dSTomohiro Misono } 239823d0b79dSTomohiro Misono 239923d0b79dSTomohiro Misono key.objectid = dirid; 240023d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 240123d0b79dSTomohiro Misono key.offset = (u64)-1; 240223d0b79dSTomohiro Misono while (1) { 240323d0b79dSTomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 240423d0b79dSTomohiro Misono if (ret < 0) { 2405b8a49ae1SJosef Bacik goto out_put; 240623d0b79dSTomohiro Misono } else if (ret > 0) { 240723d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 240823d0b79dSTomohiro Misono BTRFS_INODE_REF_KEY); 240923d0b79dSTomohiro Misono if (ret < 0) { 2410b8a49ae1SJosef Bacik goto out_put; 241123d0b79dSTomohiro Misono } else if (ret > 0) { 241223d0b79dSTomohiro Misono ret = -ENOENT; 2413b8a49ae1SJosef Bacik goto out_put; 241423d0b79dSTomohiro Misono } 241523d0b79dSTomohiro Misono } 241623d0b79dSTomohiro Misono 241723d0b79dSTomohiro Misono leaf = path->nodes[0]; 241823d0b79dSTomohiro Misono slot = path->slots[0]; 241923d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 242023d0b79dSTomohiro Misono 242123d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 242223d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 242323d0b79dSTomohiro Misono ptr -= len + 1; 242423d0b79dSTomohiro Misono total_len += len + 1; 242523d0b79dSTomohiro Misono if (ptr < args->path) { 242623d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2427b8a49ae1SJosef Bacik goto out_put; 242823d0b79dSTomohiro Misono } 242923d0b79dSTomohiro Misono 243023d0b79dSTomohiro Misono *(ptr + len) = '/'; 243123d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 243223d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 243323d0b79dSTomohiro Misono 243423d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 243523d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 243623d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 243723d0b79dSTomohiro Misono if (ret < 0) { 2438b8a49ae1SJosef Bacik goto out_put; 243923d0b79dSTomohiro Misono } else if (ret > 0) { 244023d0b79dSTomohiro Misono ret = -ENOENT; 2441b8a49ae1SJosef Bacik goto out_put; 244223d0b79dSTomohiro Misono } 244323d0b79dSTomohiro Misono 244423d0b79dSTomohiro Misono leaf = path->nodes[0]; 244523d0b79dSTomohiro Misono slot = path->slots[0]; 244623d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 244723d0b79dSTomohiro Misono if (key2.objectid != dirid) { 244823d0b79dSTomohiro Misono ret = -ENOENT; 2449b8a49ae1SJosef Bacik goto out_put; 245023d0b79dSTomohiro Misono } 245123d0b79dSTomohiro Misono 24520202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 24533ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 24543ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2455b8a49ae1SJosef Bacik goto out_put; 24563ca57bd6SMisono Tomohiro } 245747291baaSChristian Brauner ret = inode_permission(&init_user_ns, temp_inode, 245847291baaSChristian Brauner MAY_READ | MAY_EXEC); 245923d0b79dSTomohiro Misono iput(temp_inode); 246023d0b79dSTomohiro Misono if (ret) { 246123d0b79dSTomohiro Misono ret = -EACCES; 2462b8a49ae1SJosef Bacik goto out_put; 246323d0b79dSTomohiro Misono } 246423d0b79dSTomohiro Misono 246523d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 246623d0b79dSTomohiro Misono break; 246723d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 246823d0b79dSTomohiro Misono ret = -EACCES; 2469b8a49ae1SJosef Bacik goto out_put; 247023d0b79dSTomohiro Misono } 247123d0b79dSTomohiro Misono 247223d0b79dSTomohiro Misono btrfs_release_path(path); 247323d0b79dSTomohiro Misono key.objectid = key.offset; 247423d0b79dSTomohiro Misono key.offset = (u64)-1; 247523d0b79dSTomohiro Misono dirid = key.objectid; 247623d0b79dSTomohiro Misono } 247723d0b79dSTomohiro Misono 247823d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 247923d0b79dSTomohiro Misono args->path[total_len] = '\0'; 248000246528SJosef Bacik btrfs_put_root(root); 2481b8a49ae1SJosef Bacik root = NULL; 248223d0b79dSTomohiro Misono btrfs_release_path(path); 248323d0b79dSTomohiro Misono } 248423d0b79dSTomohiro Misono 248523d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 248623d0b79dSTomohiro Misono key.objectid = treeid; 248723d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 248823d0b79dSTomohiro Misono key.offset = args->treeid; 2489b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 249023d0b79dSTomohiro Misono if (ret < 0) { 249123d0b79dSTomohiro Misono goto out; 249223d0b79dSTomohiro Misono } else if (ret > 0) { 249323d0b79dSTomohiro Misono ret = -ENOENT; 249423d0b79dSTomohiro Misono goto out; 249523d0b79dSTomohiro Misono } 249623d0b79dSTomohiro Misono 249723d0b79dSTomohiro Misono leaf = path->nodes[0]; 249823d0b79dSTomohiro Misono slot = path->slots[0]; 249923d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 250023d0b79dSTomohiro Misono 250123d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 250223d0b79dSTomohiro Misono item_len = btrfs_item_size_nr(leaf, slot); 250323d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 250423d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 250523d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 250623d0b79dSTomohiro Misono ret = -EINVAL; 250723d0b79dSTomohiro Misono goto out; 250823d0b79dSTomohiro Misono } 250923d0b79dSTomohiro Misono 251023d0b79dSTomohiro Misono /* Copy subvolume's name */ 251123d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 251223d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 251323d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 251423d0b79dSTomohiro Misono args->name[item_len] = 0; 251523d0b79dSTomohiro Misono 2516b8a49ae1SJosef Bacik out_put: 251700246528SJosef Bacik btrfs_put_root(root); 251823d0b79dSTomohiro Misono out: 251923d0b79dSTomohiro Misono btrfs_free_path(path); 252023d0b79dSTomohiro Misono return ret; 252123d0b79dSTomohiro Misono } 252223d0b79dSTomohiro Misono 2523ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2524ac8e9819SChris Mason void __user *argp) 2525ac8e9819SChris Mason { 2526ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2527ac8e9819SChris Mason struct inode *inode; 252801b810b8SDavid Sterba int ret = 0; 2529ac8e9819SChris Mason 25302354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 25312354d08fSJulia Lawall if (IS_ERR(args)) 25322354d08fSJulia Lawall return PTR_ERR(args); 2533c2b96929SDan Carpenter 2534496ad9aaSAl Viro inode = file_inode(file); 2535ac8e9819SChris Mason 253601b810b8SDavid Sterba /* 253701b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 253801b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 253901b810b8SDavid Sterba */ 25401b53ac4dSChris Mason if (args->treeid == 0) 25411b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 25421b53ac4dSChris Mason 254301b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 254401b810b8SDavid Sterba args->name[0] = 0; 254501b810b8SDavid Sterba goto out; 254601b810b8SDavid Sterba } 254701b810b8SDavid Sterba 254801b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 254901b810b8SDavid Sterba ret = -EPERM; 255001b810b8SDavid Sterba goto out; 255101b810b8SDavid Sterba } 255201b810b8SDavid Sterba 2553ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2554ac8e9819SChris Mason args->treeid, args->objectid, 2555ac8e9819SChris Mason args->name); 2556ac8e9819SChris Mason 255701b810b8SDavid Sterba out: 2558ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2559ac8e9819SChris Mason ret = -EFAULT; 2560ac8e9819SChris Mason 2561ac8e9819SChris Mason kfree(args); 256298d377a0STARUISI Hiroaki return ret; 256398d377a0STARUISI Hiroaki } 256498d377a0STARUISI Hiroaki 256523d0b79dSTomohiro Misono /* 256623d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 256723d0b79dSTomohiro Misono * 256823d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 256923d0b79dSTomohiro Misono * 257023d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 257123d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 257223d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 257323d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 257423d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 257523d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 257623d0b79dSTomohiro Misono */ 257723d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 257823d0b79dSTomohiro Misono { 257923d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 258023d0b79dSTomohiro Misono struct inode *inode; 258123d0b79dSTomohiro Misono int ret; 258223d0b79dSTomohiro Misono 258323d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 258423d0b79dSTomohiro Misono if (IS_ERR(args)) 258523d0b79dSTomohiro Misono return PTR_ERR(args); 258623d0b79dSTomohiro Misono 258723d0b79dSTomohiro Misono inode = file_inode(file); 258823d0b79dSTomohiro Misono 258923d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 259023d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 259123d0b79dSTomohiro Misono /* 259223d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 259323d0b79dSTomohiro Misono * called 259423d0b79dSTomohiro Misono */ 259523d0b79dSTomohiro Misono kfree(args); 259623d0b79dSTomohiro Misono return -EACCES; 259723d0b79dSTomohiro Misono } 259823d0b79dSTomohiro Misono 259923d0b79dSTomohiro Misono ret = btrfs_search_path_in_tree_user(inode, args); 260023d0b79dSTomohiro Misono 260123d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 260223d0b79dSTomohiro Misono ret = -EFAULT; 260323d0b79dSTomohiro Misono 260423d0b79dSTomohiro Misono kfree(args); 260523d0b79dSTomohiro Misono return ret; 260623d0b79dSTomohiro Misono } 260723d0b79dSTomohiro Misono 2608b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 2609b64ec075STomohiro Misono static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) 2610b64ec075STomohiro Misono { 2611b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2612b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2613b64ec075STomohiro Misono struct btrfs_root *root; 2614b64ec075STomohiro Misono struct btrfs_path *path; 2615b64ec075STomohiro Misono struct btrfs_key key; 2616b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2617b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2618b64ec075STomohiro Misono struct extent_buffer *leaf; 2619b64ec075STomohiro Misono unsigned long item_off; 2620b64ec075STomohiro Misono unsigned long item_len; 2621b64ec075STomohiro Misono struct inode *inode; 2622b64ec075STomohiro Misono int slot; 2623b64ec075STomohiro Misono int ret = 0; 2624b64ec075STomohiro Misono 2625b64ec075STomohiro Misono path = btrfs_alloc_path(); 2626b64ec075STomohiro Misono if (!path) 2627b64ec075STomohiro Misono return -ENOMEM; 2628b64ec075STomohiro Misono 2629b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2630b64ec075STomohiro Misono if (!subvol_info) { 2631b64ec075STomohiro Misono btrfs_free_path(path); 2632b64ec075STomohiro Misono return -ENOMEM; 2633b64ec075STomohiro Misono } 2634b64ec075STomohiro Misono 2635b64ec075STomohiro Misono inode = file_inode(file); 2636b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2637b64ec075STomohiro Misono 2638b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2639b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 264056e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2641b64ec075STomohiro Misono if (IS_ERR(root)) { 2642b64ec075STomohiro Misono ret = PTR_ERR(root); 264304734e84SJosef Bacik goto out_free; 264404734e84SJosef Bacik } 2645b64ec075STomohiro Misono root_item = &root->root_item; 2646b64ec075STomohiro Misono 2647b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2648b64ec075STomohiro Misono 2649b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2650b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2651b64ec075STomohiro Misono 2652b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2653b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2654b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2655b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2656b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2657b64ec075STomohiro Misono 2658b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2659b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2660b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2661b64ec075STomohiro Misono 2662b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2663b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2664b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2665b64ec075STomohiro Misono 2666b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2667b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2668b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2669b64ec075STomohiro Misono 2670b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2671b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2672b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2673b64ec075STomohiro Misono 2674b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2675b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2676b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2677b64ec075STomohiro Misono key.offset = 0; 267804734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2679b64ec075STomohiro Misono if (ret < 0) { 2680b64ec075STomohiro Misono goto out; 2681b64ec075STomohiro Misono } else if (path->slots[0] >= 2682b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 268304734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2684b64ec075STomohiro Misono if (ret < 0) { 2685b64ec075STomohiro Misono goto out; 2686b64ec075STomohiro Misono } else if (ret > 0) { 2687b64ec075STomohiro Misono ret = -EUCLEAN; 2688b64ec075STomohiro Misono goto out; 2689b64ec075STomohiro Misono } 2690b64ec075STomohiro Misono } 2691b64ec075STomohiro Misono 2692b64ec075STomohiro Misono leaf = path->nodes[0]; 2693b64ec075STomohiro Misono slot = path->slots[0]; 2694b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2695b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2696b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2697b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2698b64ec075STomohiro Misono 2699b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2700b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2701b64ec075STomohiro Misono 2702b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2703b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 2704b64ec075STomohiro Misono item_len = btrfs_item_size_nr(leaf, slot) 2705b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2706b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2707b64ec075STomohiro Misono item_off, item_len); 2708b64ec075STomohiro Misono } else { 2709b64ec075STomohiro Misono ret = -ENOENT; 2710b64ec075STomohiro Misono goto out; 2711b64ec075STomohiro Misono } 2712b64ec075STomohiro Misono } 2713b64ec075STomohiro Misono 2714b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2715b64ec075STomohiro Misono ret = -EFAULT; 2716b64ec075STomohiro Misono 2717b64ec075STomohiro Misono out: 271800246528SJosef Bacik btrfs_put_root(root); 271904734e84SJosef Bacik out_free: 2720b64ec075STomohiro Misono btrfs_free_path(path); 2721b091f7feSWaiman Long kfree(subvol_info); 2722b64ec075STomohiro Misono return ret; 2723b64ec075STomohiro Misono } 2724b64ec075STomohiro Misono 272542e4b520STomohiro Misono /* 272642e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 272742e4b520STomohiro Misono * except the subvolume name. 272842e4b520STomohiro Misono */ 272942e4b520STomohiro Misono static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp) 273042e4b520STomohiro Misono { 273142e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 273242e4b520STomohiro Misono struct btrfs_root_ref *rref; 273342e4b520STomohiro Misono struct btrfs_root *root; 273442e4b520STomohiro Misono struct btrfs_path *path; 273542e4b520STomohiro Misono struct btrfs_key key; 273642e4b520STomohiro Misono struct extent_buffer *leaf; 273742e4b520STomohiro Misono struct inode *inode; 273842e4b520STomohiro Misono u64 objectid; 273942e4b520STomohiro Misono int slot; 274042e4b520STomohiro Misono int ret; 274142e4b520STomohiro Misono u8 found; 274242e4b520STomohiro Misono 274342e4b520STomohiro Misono path = btrfs_alloc_path(); 274442e4b520STomohiro Misono if (!path) 274542e4b520STomohiro Misono return -ENOMEM; 274642e4b520STomohiro Misono 274742e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 274842e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 274942e4b520STomohiro Misono btrfs_free_path(path); 275042e4b520STomohiro Misono return PTR_ERR(rootrefs); 275142e4b520STomohiro Misono } 275242e4b520STomohiro Misono 275342e4b520STomohiro Misono inode = file_inode(file); 275442e4b520STomohiro Misono root = BTRFS_I(inode)->root->fs_info->tree_root; 275542e4b520STomohiro Misono objectid = BTRFS_I(inode)->root->root_key.objectid; 275642e4b520STomohiro Misono 275742e4b520STomohiro Misono key.objectid = objectid; 275842e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 275942e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 276042e4b520STomohiro Misono found = 0; 276142e4b520STomohiro Misono 276242e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 276342e4b520STomohiro Misono if (ret < 0) { 276442e4b520STomohiro Misono goto out; 276542e4b520STomohiro Misono } else if (path->slots[0] >= 276642e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 276742e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 276842e4b520STomohiro Misono if (ret < 0) { 276942e4b520STomohiro Misono goto out; 277042e4b520STomohiro Misono } else if (ret > 0) { 277142e4b520STomohiro Misono ret = -EUCLEAN; 277242e4b520STomohiro Misono goto out; 277342e4b520STomohiro Misono } 277442e4b520STomohiro Misono } 277542e4b520STomohiro Misono while (1) { 277642e4b520STomohiro Misono leaf = path->nodes[0]; 277742e4b520STomohiro Misono slot = path->slots[0]; 277842e4b520STomohiro Misono 277942e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 278042e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 278142e4b520STomohiro Misono ret = 0; 278242e4b520STomohiro Misono goto out; 278342e4b520STomohiro Misono } 278442e4b520STomohiro Misono 278542e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 278642e4b520STomohiro Misono ret = -EOVERFLOW; 278742e4b520STomohiro Misono goto out; 278842e4b520STomohiro Misono } 278942e4b520STomohiro Misono 279042e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 279142e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 279242e4b520STomohiro Misono rootrefs->rootref[found].dirid = 279342e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 279442e4b520STomohiro Misono found++; 279542e4b520STomohiro Misono 279642e4b520STomohiro Misono ret = btrfs_next_item(root, path); 279742e4b520STomohiro Misono if (ret < 0) { 279842e4b520STomohiro Misono goto out; 279942e4b520STomohiro Misono } else if (ret > 0) { 280042e4b520STomohiro Misono ret = -EUCLEAN; 280142e4b520STomohiro Misono goto out; 280242e4b520STomohiro Misono } 280342e4b520STomohiro Misono } 280442e4b520STomohiro Misono 280542e4b520STomohiro Misono out: 280642e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 280742e4b520STomohiro Misono rootrefs->num_items = found; 280842e4b520STomohiro Misono /* update min_treeid for next search */ 280942e4b520STomohiro Misono if (found) 281042e4b520STomohiro Misono rootrefs->min_treeid = 281142e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 281242e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 281342e4b520STomohiro Misono ret = -EFAULT; 281442e4b520STomohiro Misono } 281542e4b520STomohiro Misono 281642e4b520STomohiro Misono kfree(rootrefs); 281742e4b520STomohiro Misono btrfs_free_path(path); 281842e4b520STomohiro Misono 281942e4b520STomohiro Misono return ret; 282042e4b520STomohiro Misono } 282142e4b520STomohiro Misono 282276dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2823949964c9SMarcos Paulo de Souza void __user *arg, 2824949964c9SMarcos Paulo de Souza bool destroy_v2) 282576dda93cSYan, Zheng { 282654563d41SAl Viro struct dentry *parent = file->f_path.dentry; 28270b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 282876dda93cSYan, Zheng struct dentry *dentry; 28292b0143b5SDavid Howells struct inode *dir = d_inode(parent); 283076dda93cSYan, Zheng struct inode *inode; 283176dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 283276dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2833949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2834949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 2835949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2836949964c9SMarcos Paulo de Souza int subvol_namelen; 283776dda93cSYan, Zheng int err = 0; 2838949964c9SMarcos Paulo de Souza bool destroy_parent = false; 283976dda93cSYan, Zheng 2840949964c9SMarcos Paulo de Souza if (destroy_v2) { 2841949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2842949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2843949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2844325c50e3SJeff Mahoney 2845949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2846949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2847949964c9SMarcos Paulo de Souza goto out; 2848949964c9SMarcos Paulo de Souza } 284976dda93cSYan, Zheng 2850949964c9SMarcos Paulo de Souza /* 2851949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2852949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2853949964c9SMarcos Paulo de Souza */ 2854949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2855949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2856949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2857949964c9SMarcos Paulo de Souza 2858949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2859949964c9SMarcos Paulo de Souza if (err) 2860949964c9SMarcos Paulo de Souza goto out; 2861949964c9SMarcos Paulo de Souza } else { 2862949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 286376dda93cSYan, Zheng err = -EINVAL; 286476dda93cSYan, Zheng goto out; 286576dda93cSYan, Zheng } 286676dda93cSYan, Zheng 2867a561be71SAl Viro err = mnt_want_write_file(file); 286876dda93cSYan, Zheng if (err) 286976dda93cSYan, Zheng goto out; 287076dda93cSYan, Zheng 2871949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 2872949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 2873949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 2874949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 2875949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 2876949964c9SMarcos Paulo de Souza goto out_drop_write; 2877949964c9SMarcos Paulo de Souza } 2878949964c9SMarcos Paulo de Souza 2879949964c9SMarcos Paulo de Souza /* 2880949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 2881949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 2882949964c9SMarcos Paulo de Souza */ 2883949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 2884949964c9SMarcos Paulo de Souza 2885949964c9SMarcos Paulo de Souza /* 2886949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 2887949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 2888949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 2889949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 2890949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 2891949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 2892949964c9SMarcos Paulo de Souza */ 2893949964c9SMarcos Paulo de Souza dput(dentry); 2894949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 2895949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 2896949964c9SMarcos Paulo de Souza goto out_drop_write; 2897949964c9SMarcos Paulo de Souza } 2898949964c9SMarcos Paulo de Souza dir = d_inode(parent); 2899949964c9SMarcos Paulo de Souza 2900949964c9SMarcos Paulo de Souza /* 2901949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 2902949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 2903949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 2904949964c9SMarcos Paulo de Souza * new parent dentry. 2905949964c9SMarcos Paulo de Souza */ 2906949964c9SMarcos Paulo de Souza destroy_parent = true; 2907949964c9SMarcos Paulo de Souza 2908949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 2909949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 2910949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 2911949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 2912949964c9SMarcos Paulo de Souza goto free_parent; 2913949964c9SMarcos Paulo de Souza } 2914949964c9SMarcos Paulo de Souza /* subvol_name_ptr is already NULL termined */ 2915949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 2916949964c9SMarcos Paulo de Souza } 2917949964c9SMarcos Paulo de Souza } else { 2918949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 2919949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 2920949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 2921949964c9SMarcos Paulo de Souza 2922949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 2923949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 2924949964c9SMarcos Paulo de Souza 2925949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2926949964c9SMarcos Paulo de Souza if (err) 2927949964c9SMarcos Paulo de Souza goto out; 2928949964c9SMarcos Paulo de Souza } 2929949964c9SMarcos Paulo de Souza 2930949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 2931949964c9SMarcos Paulo de Souza 2932949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 2933949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 2934949964c9SMarcos Paulo de Souza err = -EINVAL; 2935949964c9SMarcos Paulo de Souza goto free_subvol_name; 2936949964c9SMarcos Paulo de Souza } 2937949964c9SMarcos Paulo de Souza 2938949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 2939949964c9SMarcos Paulo de Souza err = -ENOTDIR; 2940949964c9SMarcos Paulo de Souza goto free_subvol_name; 2941949964c9SMarcos Paulo de Souza } 2942521e0546SDavid Sterba 294300235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 294400235411SAl Viro if (err == -EINTR) 2945949964c9SMarcos Paulo de Souza goto free_subvol_name; 2946949964c9SMarcos Paulo de Souza dentry = lookup_one_len(subvol_name, parent, subvol_namelen); 294776dda93cSYan, Zheng if (IS_ERR(dentry)) { 294876dda93cSYan, Zheng err = PTR_ERR(dentry); 294976dda93cSYan, Zheng goto out_unlock_dir; 295076dda93cSYan, Zheng } 295176dda93cSYan, Zheng 29522b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 295376dda93cSYan, Zheng err = -ENOENT; 295476dda93cSYan, Zheng goto out_dput; 295576dda93cSYan, Zheng } 295676dda93cSYan, Zheng 29572b0143b5SDavid Howells inode = d_inode(dentry); 29584260f7c7SSage Weil dest = BTRFS_I(inode)->root; 29594260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 29604260f7c7SSage Weil /* 29614260f7c7SSage Weil * Regular user. Only allow this with a special mount 29624260f7c7SSage Weil * option, when the user has write+exec access to the 29634260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 29644260f7c7SSage Weil * allowed. 29654260f7c7SSage Weil * 29664260f7c7SSage Weil * Note that this is _not_ check that the subvol is 29674260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 29684260f7c7SSage Weil * otherwise be able to delete. 29694260f7c7SSage Weil * 29704260f7c7SSage Weil * Users who want to delete empty subvols should try 29714260f7c7SSage Weil * rmdir(2). 29724260f7c7SSage Weil */ 29734260f7c7SSage Weil err = -EPERM; 29740b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 29754260f7c7SSage Weil goto out_dput; 29764260f7c7SSage Weil 29774260f7c7SSage Weil /* 29784260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 29794260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 29804260f7c7SSage Weil * must be called on the dentry referencing the root 29814260f7c7SSage Weil * of the subvol, not a random directory contained 29824260f7c7SSage Weil * within it. 29834260f7c7SSage Weil */ 29844260f7c7SSage Weil err = -EINVAL; 29854260f7c7SSage Weil if (root == dest) 29864260f7c7SSage Weil goto out_dput; 29874260f7c7SSage Weil 298847291baaSChristian Brauner err = inode_permission(&init_user_ns, inode, 298947291baaSChristian Brauner MAY_WRITE | MAY_EXEC); 29904260f7c7SSage Weil if (err) 29914260f7c7SSage Weil goto out_dput; 29925c39da5bSMiao Xie } 29934260f7c7SSage Weil 29945c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 29954260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 29964260f7c7SSage Weil if (err) 29974260f7c7SSage Weil goto out_dput; 29984260f7c7SSage Weil 29994a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 300076dda93cSYan, Zheng err = -EINVAL; 300176dda93cSYan, Zheng goto out_dput; 300276dda93cSYan, Zheng } 300376dda93cSYan, Zheng 300464708539SJosef Bacik btrfs_inode_lock(inode, 0); 3005f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 300664708539SJosef Bacik btrfs_inode_unlock(inode, 0); 300746008d9dSAmir Goldstein if (!err) { 300846008d9dSAmir Goldstein fsnotify_rmdir(dir, dentry); 300976dda93cSYan, Zheng d_delete(dentry); 301046008d9dSAmir Goldstein } 3011fa6ac876SLiu Bo 301276dda93cSYan, Zheng out_dput: 301376dda93cSYan, Zheng dput(dentry); 301476dda93cSYan, Zheng out_unlock_dir: 301564708539SJosef Bacik btrfs_inode_unlock(dir, 0); 3016949964c9SMarcos Paulo de Souza free_subvol_name: 3017949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3018949964c9SMarcos Paulo de Souza free_parent: 3019949964c9SMarcos Paulo de Souza if (destroy_parent) 3020949964c9SMarcos Paulo de Souza dput(parent); 302100235411SAl Viro out_drop_write: 30222a79f17eSAl Viro mnt_drop_write_file(file); 302376dda93cSYan, Zheng out: 3024949964c9SMarcos Paulo de Souza kfree(vol_args2); 302576dda93cSYan, Zheng kfree(vol_args); 302676dda93cSYan, Zheng return err; 302776dda93cSYan, Zheng } 302876dda93cSYan, Zheng 30291e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3030f46b5a66SChristoph Hellwig { 3031496ad9aaSAl Viro struct inode *inode = file_inode(file); 3032f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 30331e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 3034c146afadSYan Zheng int ret; 3035c146afadSYan Zheng 303625122d15SIlya Dryomov ret = mnt_want_write_file(file); 303725122d15SIlya Dryomov if (ret) 303825122d15SIlya Dryomov return ret; 3039b83cc969SLi Zefan 304025122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 304125122d15SIlya Dryomov ret = -EROFS; 304225122d15SIlya Dryomov goto out; 30435ac00addSStefan Behrens } 3044f46b5a66SChristoph Hellwig 3045f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3046f46b5a66SChristoph Hellwig case S_IFDIR: 3047e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3048e441d54dSChris Mason ret = -EPERM; 3049e441d54dSChris Mason goto out; 3050e441d54dSChris Mason } 3051de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3052f46b5a66SChristoph Hellwig break; 3053f46b5a66SChristoph Hellwig case S_IFREG: 3054616d374eSAdam Borowski /* 3055616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3056616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3057616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3058616d374eSAdam Borowski */ 3059616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 306047291baaSChristian Brauner inode_permission(&init_user_ns, inode, MAY_WRITE)) { 3061616d374eSAdam Borowski ret = -EPERM; 3062e441d54dSChris Mason goto out; 3063e441d54dSChris Mason } 30641e701a32SChris Mason 30651e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 30661e701a32SChris Mason if (!range) { 30671e701a32SChris Mason ret = -ENOMEM; 30681e701a32SChris Mason goto out; 30691e701a32SChris Mason } 30701e701a32SChris Mason 30711e701a32SChris Mason if (argp) { 30721e701a32SChris Mason if (copy_from_user(range, argp, 30731e701a32SChris Mason sizeof(*range))) { 30741e701a32SChris Mason ret = -EFAULT; 30751e701a32SChris Mason kfree(range); 3076683be16eSDan Carpenter goto out; 30771e701a32SChris Mason } 30781e701a32SChris Mason /* compression requires us to start the IO */ 30791e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 30801e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 30811e701a32SChris Mason range->extent_thresh = (u32)-1; 30821e701a32SChris Mason } 30831e701a32SChris Mason } else { 30841e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 30851e701a32SChris Mason range->len = (u64)-1; 30861e701a32SChris Mason } 3087496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 30887c829b72SAnand Jain range, BTRFS_OLDEST_GENERATION, 0); 30894cb5300bSChris Mason if (ret > 0) 30904cb5300bSChris Mason ret = 0; 30911e701a32SChris Mason kfree(range); 3092f46b5a66SChristoph Hellwig break; 30938929ecfaSYan, Zheng default: 30948929ecfaSYan, Zheng ret = -EINVAL; 3095f46b5a66SChristoph Hellwig } 3096e441d54dSChris Mason out: 309725122d15SIlya Dryomov mnt_drop_write_file(file); 3098e441d54dSChris Mason return ret; 3099f46b5a66SChristoph Hellwig } 3100f46b5a66SChristoph Hellwig 31012ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3102f46b5a66SChristoph Hellwig { 3103f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3104f46b5a66SChristoph Hellwig int ret; 3105f46b5a66SChristoph Hellwig 3106e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3107e441d54dSChris Mason return -EPERM; 3108e441d54dSChris Mason 3109c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) 3110e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3111c9e9f97bSIlya Dryomov 3112dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3113c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3114c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3115c9e9f97bSIlya Dryomov goto out; 3116c9e9f97bSIlya Dryomov } 3117f46b5a66SChristoph Hellwig 31185516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 31192ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3120f46b5a66SChristoph Hellwig 312143d20761SAnand Jain if (!ret) 31220b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 312343d20761SAnand Jain 3124f46b5a66SChristoph Hellwig kfree(vol_args); 3125c9e9f97bSIlya Dryomov out: 3126c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3127f46b5a66SChristoph Hellwig return ret; 3128f46b5a66SChristoph Hellwig } 3129f46b5a66SChristoph Hellwig 31306b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3131f46b5a66SChristoph Hellwig { 31320b246afaSJeff Mahoney struct inode *inode = file_inode(file); 31330b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 31346b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 3135f46b5a66SChristoph Hellwig int ret; 3136f46b5a66SChristoph Hellwig 3137e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3138e441d54dSChris Mason return -EPERM; 3139e441d54dSChris Mason 3140da24927bSMiao Xie ret = mnt_want_write_file(file); 3141da24927bSMiao Xie if (ret) 3142da24927bSMiao Xie return ret; 3143c146afadSYan Zheng 3144dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3145c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3146c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3147c47ca32dSDan Carpenter goto err_drop; 3148c9e9f97bSIlya Dryomov } 3149f46b5a66SChristoph Hellwig 3150748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3151fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3152fd4e994bSOmar Sandoval goto out; 3153fd4e994bSOmar Sandoval } 3154f46b5a66SChristoph Hellwig 3155c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REMOVE)) { 3156183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3157183860f6SAnand Jain goto out; 3158183860f6SAnand Jain } 3159183860f6SAnand Jain 3160735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 31612ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, NULL, vol_args->devid); 31626b526ed7SAnand Jain } else { 31636b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 31642ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 31656b526ed7SAnand Jain } 3166c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3167183860f6SAnand Jain 31686b526ed7SAnand Jain if (!ret) { 3169735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 31700b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 31716b526ed7SAnand Jain vol_args->devid); 31726b526ed7SAnand Jain else 31730b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 31746b526ed7SAnand Jain vol_args->name); 31756b526ed7SAnand Jain } 3176183860f6SAnand Jain out: 3177183860f6SAnand Jain kfree(vol_args); 3178c47ca32dSDan Carpenter err_drop: 31794ac20c70SIlya Dryomov mnt_drop_write_file(file); 3180f46b5a66SChristoph Hellwig return ret; 3181f46b5a66SChristoph Hellwig } 3182f46b5a66SChristoph Hellwig 3183f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3184f46b5a66SChristoph Hellwig { 31850b246afaSJeff Mahoney struct inode *inode = file_inode(file); 31860b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3187f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3188f46b5a66SChristoph Hellwig int ret; 3189f46b5a66SChristoph Hellwig 3190f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3191f46b5a66SChristoph Hellwig return -EPERM; 3192f46b5a66SChristoph Hellwig 3193f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3194f46b5a66SChristoph Hellwig if (ret) 3195f46b5a66SChristoph Hellwig return ret; 3196f46b5a66SChristoph Hellwig 3197c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REMOVE)) { 3198f46b5a66SChristoph Hellwig ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 319958d7bbf8SDavid Sterba goto out_drop_write; 320058d7bbf8SDavid Sterba } 320158d7bbf8SDavid Sterba 320258d7bbf8SDavid Sterba vol_args = memdup_user(arg, sizeof(*vol_args)); 320358d7bbf8SDavid Sterba if (IS_ERR(vol_args)) { 320458d7bbf8SDavid Sterba ret = PTR_ERR(vol_args); 3205f46b5a66SChristoph Hellwig goto out; 3206f46b5a66SChristoph Hellwig } 3207f46b5a66SChristoph Hellwig 320858d7bbf8SDavid Sterba vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 32092ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 3210f46b5a66SChristoph Hellwig 3211f46b5a66SChristoph Hellwig if (!ret) 32120b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3213f46b5a66SChristoph Hellwig kfree(vol_args); 321458d7bbf8SDavid Sterba out: 3215c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 321658d7bbf8SDavid Sterba out_drop_write: 3217f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 321858d7bbf8SDavid Sterba 3219f46b5a66SChristoph Hellwig return ret; 3220f46b5a66SChristoph Hellwig } 3221f46b5a66SChristoph Hellwig 32222ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 32232ff7e61eSJeff Mahoney void __user *arg) 3224475f6387SJan Schmidt { 3225027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3226475f6387SJan Schmidt struct btrfs_device *device; 32270b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3228137c5418SJohannes Thumshirn u64 flags_in; 3229027ed2f0SLi Zefan int ret = 0; 3230475f6387SJan Schmidt 3231137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3232137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3233137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3234137c5418SJohannes Thumshirn 3235137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3236137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3237027ed2f0SLi Zefan 3238d03262c7SDavid Sterba rcu_read_lock(); 3239027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3240475f6387SJan Schmidt 3241d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3242027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3243027ed2f0SLi Zefan fi_args->max_id = device->devid; 3244475f6387SJan Schmidt } 3245d03262c7SDavid Sterba rcu_read_unlock(); 3246475f6387SJan Schmidt 3247de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3248bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3249bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3250bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 325180a773fbSDavid Sterba 3252137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3253137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3254137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3255137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3256137c5418SJohannes Thumshirn } 3257137c5418SJohannes Thumshirn 32580fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 32590fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 32600fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 32610fb408a5SJohannes Thumshirn } 32620fb408a5SJohannes Thumshirn 326349bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 326449bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 326549bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 326649bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 326749bac897SJohannes Thumshirn } 326849bac897SJohannes Thumshirn 3269027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3270027ed2f0SLi Zefan ret = -EFAULT; 3271475f6387SJan Schmidt 3272027ed2f0SLi Zefan kfree(fi_args); 3273027ed2f0SLi Zefan return ret; 3274475f6387SJan Schmidt } 3275475f6387SJan Schmidt 32762ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 32772ff7e61eSJeff Mahoney void __user *arg) 3278475f6387SJan Schmidt { 3279475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3280475f6387SJan Schmidt struct btrfs_device *dev; 3281475f6387SJan Schmidt int ret = 0; 3282475f6387SJan Schmidt char *s_uuid = NULL; 3283475f6387SJan Schmidt 3284475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3285475f6387SJan Schmidt if (IS_ERR(di_args)) 3286475f6387SJan Schmidt return PTR_ERR(di_args); 3287475f6387SJan Schmidt 3288dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3289475f6387SJan Schmidt s_uuid = di_args->uuid; 3290475f6387SJan Schmidt 3291c5593ca3SDavid Sterba rcu_read_lock(); 3292e4319cd9SAnand Jain dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid, 3293b2598edfSAnand Jain NULL); 3294475f6387SJan Schmidt 3295475f6387SJan Schmidt if (!dev) { 3296475f6387SJan Schmidt ret = -ENODEV; 3297475f6387SJan Schmidt goto out; 3298475f6387SJan Schmidt } 3299475f6387SJan Schmidt 3300475f6387SJan Schmidt di_args->devid = dev->devid; 33017cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 33027cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3303475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3304a27202fbSJim Meyering if (dev->name) { 3305672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3306672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3307a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3308a27202fbSJim Meyering } else { 330999ba55adSStefan Behrens di_args->path[0] = '\0'; 3310a27202fbSJim Meyering } 3311475f6387SJan Schmidt 3312475f6387SJan Schmidt out: 3313c5593ca3SDavid Sterba rcu_read_unlock(); 3314475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3315475f6387SJan Schmidt ret = -EFAULT; 3316475f6387SJan Schmidt 3317475f6387SJan Schmidt kfree(di_args); 3318475f6387SJan Schmidt return ret; 3319475f6387SJan Schmidt } 3320475f6387SJan Schmidt 33216ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 33226ef5ed0dSJosef Bacik { 3323496ad9aaSAl Viro struct inode *inode = file_inode(file); 33240b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 33256ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 33266ef5ed0dSJosef Bacik struct btrfs_root *new_root; 33276ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 33286ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 33292a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 33306ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 33316ef5ed0dSJosef Bacik u64 objectid = 0; 33326ef5ed0dSJosef Bacik u64 dir_id; 33333c04ce01SMiao Xie int ret; 33346ef5ed0dSJosef Bacik 33356ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 33366ef5ed0dSJosef Bacik return -EPERM; 33376ef5ed0dSJosef Bacik 33383c04ce01SMiao Xie ret = mnt_want_write_file(file); 33393c04ce01SMiao Xie if (ret) 33403c04ce01SMiao Xie return ret; 33413c04ce01SMiao Xie 33423c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 33433c04ce01SMiao Xie ret = -EFAULT; 33443c04ce01SMiao Xie goto out; 33453c04ce01SMiao Xie } 33466ef5ed0dSJosef Bacik 33476ef5ed0dSJosef Bacik if (!objectid) 33481cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 33496ef5ed0dSJosef Bacik 335056e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 33513c04ce01SMiao Xie if (IS_ERR(new_root)) { 33523c04ce01SMiao Xie ret = PTR_ERR(new_root); 33533c04ce01SMiao Xie goto out; 33543c04ce01SMiao Xie } 33552a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 33562a2b5d62SJosef Bacik ret = -ENOENT; 33572a2b5d62SJosef Bacik goto out_free; 33582a2b5d62SJosef Bacik } 33596ef5ed0dSJosef Bacik 33606ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 33613c04ce01SMiao Xie if (!path) { 33623c04ce01SMiao Xie ret = -ENOMEM; 33632a2b5d62SJosef Bacik goto out_free; 33643c04ce01SMiao Xie } 33656ef5ed0dSJosef Bacik 33666ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 336798d5dc13STsutomu Itoh if (IS_ERR(trans)) { 33683c04ce01SMiao Xie ret = PTR_ERR(trans); 33692a2b5d62SJosef Bacik goto out_free; 33706ef5ed0dSJosef Bacik } 33716ef5ed0dSJosef Bacik 33720b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 33730b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 33746ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3375cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 33762a2b5d62SJosef Bacik btrfs_release_path(path); 33773a45bb20SJeff Mahoney btrfs_end_transaction(trans); 33780b246afaSJeff Mahoney btrfs_err(fs_info, 33795d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 33803c04ce01SMiao Xie ret = -ENOENT; 33812a2b5d62SJosef Bacik goto out_free; 33826ef5ed0dSJosef Bacik } 33836ef5ed0dSJosef Bacik 33846ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 33856ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 33866ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 33872a2b5d62SJosef Bacik btrfs_release_path(path); 33886ef5ed0dSJosef Bacik 33890b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 33903a45bb20SJeff Mahoney btrfs_end_transaction(trans); 33912a2b5d62SJosef Bacik out_free: 339200246528SJosef Bacik btrfs_put_root(new_root); 33932a2b5d62SJosef Bacik btrfs_free_path(path); 33943c04ce01SMiao Xie out: 33953c04ce01SMiao Xie mnt_drop_write_file(file); 33963c04ce01SMiao Xie return ret; 33976ef5ed0dSJosef Bacik } 33986ef5ed0dSJosef Bacik 3399c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3400bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3401bf5fc093SJosef Bacik { 340232da5386SDavid Sterba struct btrfs_block_group *block_group; 3403bf5fc093SJosef Bacik 3404bf5fc093SJosef Bacik space->total_bytes = 0; 3405bf5fc093SJosef Bacik space->used_bytes = 0; 3406bf5fc093SJosef Bacik space->flags = 0; 3407bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3408bf5fc093SJosef Bacik space->flags = block_group->flags; 3409b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3410bf38be65SDavid Sterba space->used_bytes += block_group->used; 3411bf5fc093SJosef Bacik } 3412bf5fc093SJosef Bacik } 3413bf5fc093SJosef Bacik 34142ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 34152ff7e61eSJeff Mahoney void __user *arg) 34161406e432SJosef Bacik { 34171406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 34181406e432SJosef Bacik struct btrfs_ioctl_space_info space; 34191406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 34207fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 342113f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 34221406e432SJosef Bacik struct btrfs_space_info *info; 3423315d8e98SColin Ian King static const u64 types[] = { 3424315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3425bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3426bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3427315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3428315d8e98SColin Ian King }; 3429bf5fc093SJosef Bacik int num_types = 4; 34307fde62bfSChris Mason int alloc_size; 34311406e432SJosef Bacik int ret = 0; 343251788b1bSDan Rosenberg u64 slot_count = 0; 3433bf5fc093SJosef Bacik int i, c; 34341406e432SJosef Bacik 34351406e432SJosef Bacik if (copy_from_user(&space_args, 34361406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 34371406e432SJosef Bacik sizeof(space_args))) 34381406e432SJosef Bacik return -EFAULT; 34391406e432SJosef Bacik 3440bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3441bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3442bf5fc093SJosef Bacik 3443bf5fc093SJosef Bacik info = NULL; 344472804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3445bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3446bf5fc093SJosef Bacik info = tmp; 3447bf5fc093SJosef Bacik break; 3448bf5fc093SJosef Bacik } 3449bf5fc093SJosef Bacik } 34501406e432SJosef Bacik 3451bf5fc093SJosef Bacik if (!info) 3452bf5fc093SJosef Bacik continue; 3453bf5fc093SJosef Bacik 3454bf5fc093SJosef Bacik down_read(&info->groups_sem); 3455bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3456bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3457bf5fc093SJosef Bacik slot_count++; 3458bf5fc093SJosef Bacik } 3459bf5fc093SJosef Bacik up_read(&info->groups_sem); 3460bf5fc093SJosef Bacik } 3461bf5fc093SJosef Bacik 346236523e95SDavid Sterba /* 346336523e95SDavid Sterba * Global block reserve, exported as a space_info 346436523e95SDavid Sterba */ 346536523e95SDavid Sterba slot_count++; 346636523e95SDavid Sterba 34677fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 34687fde62bfSChris Mason if (space_args.space_slots == 0) { 34697fde62bfSChris Mason space_args.total_spaces = slot_count; 34707fde62bfSChris Mason goto out; 34717fde62bfSChris Mason } 3472bf5fc093SJosef Bacik 347351788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3474bf5fc093SJosef Bacik 34757fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3476bf5fc093SJosef Bacik 34777fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 34787fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 34797fde62bfSChris Mason */ 348009cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 34817fde62bfSChris Mason return -ENOMEM; 34827fde62bfSChris Mason 34837fde62bfSChris Mason space_args.total_spaces = 0; 34848d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 34857fde62bfSChris Mason if (!dest) 34867fde62bfSChris Mason return -ENOMEM; 34877fde62bfSChris Mason dest_orig = dest; 34887fde62bfSChris Mason 34897fde62bfSChris Mason /* now we have a buffer to copy into */ 3490bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3491bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3492bf5fc093SJosef Bacik 349351788b1bSDan Rosenberg if (!slot_count) 349451788b1bSDan Rosenberg break; 349551788b1bSDan Rosenberg 3496bf5fc093SJosef Bacik info = NULL; 349772804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3498bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3499bf5fc093SJosef Bacik info = tmp; 35007fde62bfSChris Mason break; 3501bf5fc093SJosef Bacik } 3502bf5fc093SJosef Bacik } 35037fde62bfSChris Mason 3504bf5fc093SJosef Bacik if (!info) 3505bf5fc093SJosef Bacik continue; 3506bf5fc093SJosef Bacik down_read(&info->groups_sem); 3507bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3508bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3509c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3510c065f5b1SSu Yue &space); 35117fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 35121406e432SJosef Bacik dest++; 35131406e432SJosef Bacik space_args.total_spaces++; 351451788b1bSDan Rosenberg slot_count--; 35151406e432SJosef Bacik } 351651788b1bSDan Rosenberg if (!slot_count) 351751788b1bSDan Rosenberg break; 3518bf5fc093SJosef Bacik } 3519bf5fc093SJosef Bacik up_read(&info->groups_sem); 3520bf5fc093SJosef Bacik } 35211406e432SJosef Bacik 352236523e95SDavid Sterba /* 352336523e95SDavid Sterba * Add global block reserve 352436523e95SDavid Sterba */ 352536523e95SDavid Sterba if (slot_count) { 35260b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 352736523e95SDavid Sterba 352836523e95SDavid Sterba spin_lock(&block_rsv->lock); 352936523e95SDavid Sterba space.total_bytes = block_rsv->size; 353036523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 353136523e95SDavid Sterba spin_unlock(&block_rsv->lock); 353236523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 353336523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 353436523e95SDavid Sterba space_args.total_spaces++; 353536523e95SDavid Sterba } 353636523e95SDavid Sterba 35372eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 35387fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 35397fde62bfSChris Mason 35407fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 35417fde62bfSChris Mason ret = -EFAULT; 35427fde62bfSChris Mason 35437fde62bfSChris Mason kfree(dest_orig); 35447fde62bfSChris Mason out: 35457fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 35461406e432SJosef Bacik ret = -EFAULT; 35471406e432SJosef Bacik 35481406e432SJosef Bacik return ret; 35491406e432SJosef Bacik } 35501406e432SJosef Bacik 35519a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 35529a8c28beSMiao Xie void __user *argp) 355346204592SSage Weil { 355446204592SSage Weil struct btrfs_trans_handle *trans; 355546204592SSage Weil u64 transid; 3556db5b493aSTsutomu Itoh int ret; 355746204592SSage Weil 3558d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3559ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3560ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 356198d5dc13STsutomu Itoh return PTR_ERR(trans); 3562ff7c1d33SMiao Xie 3563ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3564ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3565ff7c1d33SMiao Xie goto out; 3566ff7c1d33SMiao Xie } 356746204592SSage Weil transid = trans->transid; 35683a45bb20SJeff Mahoney ret = btrfs_commit_transaction_async(trans, 0); 35698b2b2d3cSTsutomu Itoh if (ret) { 35703a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3571db5b493aSTsutomu Itoh return ret; 35728b2b2d3cSTsutomu Itoh } 3573ff7c1d33SMiao Xie out: 357446204592SSage Weil if (argp) 357546204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 357646204592SSage Weil return -EFAULT; 357746204592SSage Weil return 0; 357846204592SSage Weil } 357946204592SSage Weil 35802ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 35819a8c28beSMiao Xie void __user *argp) 358246204592SSage Weil { 358346204592SSage Weil u64 transid; 358446204592SSage Weil 358546204592SSage Weil if (argp) { 358646204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 358746204592SSage Weil return -EFAULT; 358846204592SSage Weil } else { 358946204592SSage Weil transid = 0; /* current trans */ 359046204592SSage Weil } 35912ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 359246204592SSage Weil } 359346204592SSage Weil 3594b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3595475f6387SJan Schmidt { 35960b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3597475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3598b8e95489SMiao Xie int ret; 3599475f6387SJan Schmidt 3600475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3601475f6387SJan Schmidt return -EPERM; 3602475f6387SJan Schmidt 3603475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3604475f6387SJan Schmidt if (IS_ERR(sa)) 3605475f6387SJan Schmidt return PTR_ERR(sa); 3606475f6387SJan Schmidt 3607b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3608b8e95489SMiao Xie ret = mnt_want_write_file(file); 3609b8e95489SMiao Xie if (ret) 3610b8e95489SMiao Xie goto out; 3611b8e95489SMiao Xie } 3612b8e95489SMiao Xie 36130b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 361463a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 361563a212abSStefan Behrens 0); 3616475f6387SJan Schmidt 36175afe6ce7SFilipe Manana /* 36185afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 36195afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 36205afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 36215afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 36225afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 36235afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 36245afe6ce7SFilipe Manana * previously (btrfs-progs does this). 36255afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 36265afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 36275afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 36285afe6ce7SFilipe Manana */ 36295afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3630475f6387SJan Schmidt ret = -EFAULT; 3631475f6387SJan Schmidt 3632b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3633b8e95489SMiao Xie mnt_drop_write_file(file); 3634b8e95489SMiao Xie out: 3635475f6387SJan Schmidt kfree(sa); 3636475f6387SJan Schmidt return ret; 3637475f6387SJan Schmidt } 3638475f6387SJan Schmidt 36392ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3640475f6387SJan Schmidt { 3641475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3642475f6387SJan Schmidt return -EPERM; 3643475f6387SJan Schmidt 36442ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3645475f6387SJan Schmidt } 3646475f6387SJan Schmidt 36472ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3648475f6387SJan Schmidt void __user *arg) 3649475f6387SJan Schmidt { 3650475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3651475f6387SJan Schmidt int ret; 3652475f6387SJan Schmidt 3653475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3654475f6387SJan Schmidt return -EPERM; 3655475f6387SJan Schmidt 3656475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3657475f6387SJan Schmidt if (IS_ERR(sa)) 3658475f6387SJan Schmidt return PTR_ERR(sa); 3659475f6387SJan Schmidt 36602ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3661475f6387SJan Schmidt 36624fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3663475f6387SJan Schmidt ret = -EFAULT; 3664475f6387SJan Schmidt 3665475f6387SJan Schmidt kfree(sa); 3666475f6387SJan Schmidt return ret; 3667475f6387SJan Schmidt } 3668475f6387SJan Schmidt 36692ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3670b27f7c0cSDavid Sterba void __user *arg) 3671c11d2c23SStefan Behrens { 3672c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3673c11d2c23SStefan Behrens int ret; 3674c11d2c23SStefan Behrens 3675c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3676c11d2c23SStefan Behrens if (IS_ERR(sa)) 3677c11d2c23SStefan Behrens return PTR_ERR(sa); 3678c11d2c23SStefan Behrens 3679b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3680b27f7c0cSDavid Sterba kfree(sa); 3681b27f7c0cSDavid Sterba return -EPERM; 3682b27f7c0cSDavid Sterba } 3683b27f7c0cSDavid Sterba 36842ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3685c11d2c23SStefan Behrens 3686eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3687c11d2c23SStefan Behrens ret = -EFAULT; 3688c11d2c23SStefan Behrens 3689c11d2c23SStefan Behrens kfree(sa); 3690c11d2c23SStefan Behrens return ret; 3691c11d2c23SStefan Behrens } 3692c11d2c23SStefan Behrens 36932ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 36942ff7e61eSJeff Mahoney void __user *arg) 36953f6bcfbdSStefan Behrens { 36963f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 36973f6bcfbdSStefan Behrens int ret; 36983f6bcfbdSStefan Behrens 36993f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 37003f6bcfbdSStefan Behrens return -EPERM; 37013f6bcfbdSStefan Behrens 37023f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 37033f6bcfbdSStefan Behrens if (IS_ERR(p)) 37043f6bcfbdSStefan Behrens return PTR_ERR(p); 37053f6bcfbdSStefan Behrens 37063f6bcfbdSStefan Behrens switch (p->cmd) { 37073f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3708bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3709adfa97cbSIlya Dryomov ret = -EROFS; 3710adfa97cbSIlya Dryomov goto out; 3711adfa97cbSIlya Dryomov } 3712c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 3713e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 37143f6bcfbdSStefan Behrens } else { 37152ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3716c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 37173f6bcfbdSStefan Behrens } 37183f6bcfbdSStefan Behrens break; 37193f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 37200b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 37213f6bcfbdSStefan Behrens ret = 0; 37223f6bcfbdSStefan Behrens break; 37233f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 372417d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 372597282031SAnand Jain ret = 0; 37263f6bcfbdSStefan Behrens break; 37273f6bcfbdSStefan Behrens default: 37283f6bcfbdSStefan Behrens ret = -EINVAL; 37293f6bcfbdSStefan Behrens break; 37303f6bcfbdSStefan Behrens } 37313f6bcfbdSStefan Behrens 3732d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 37333f6bcfbdSStefan Behrens ret = -EFAULT; 3734adfa97cbSIlya Dryomov out: 37353f6bcfbdSStefan Behrens kfree(p); 37363f6bcfbdSStefan Behrens return ret; 37373f6bcfbdSStefan Behrens } 37383f6bcfbdSStefan Behrens 3739d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3740d7728c96SJan Schmidt { 3741d7728c96SJan Schmidt int ret = 0; 3742d7728c96SJan Schmidt int i; 3743740c3d22SChris Mason u64 rel_ptr; 3744d7728c96SJan Schmidt int size; 3745806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3746d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3747d7728c96SJan Schmidt struct btrfs_path *path; 3748d7728c96SJan Schmidt 374982b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3750d7728c96SJan Schmidt return -EPERM; 3751d7728c96SJan Schmidt 3752d7728c96SJan Schmidt path = btrfs_alloc_path(); 3753d7728c96SJan Schmidt if (!path) { 3754d7728c96SJan Schmidt ret = -ENOMEM; 3755d7728c96SJan Schmidt goto out; 3756d7728c96SJan Schmidt } 3757d7728c96SJan Schmidt 3758d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3759d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3760d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3761d7728c96SJan Schmidt ipa = NULL; 3762d7728c96SJan Schmidt goto out; 3763d7728c96SJan Schmidt } 3764d7728c96SJan Schmidt 3765d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3766d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3767d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3768d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3769d7728c96SJan Schmidt ipath = NULL; 3770d7728c96SJan Schmidt goto out; 3771d7728c96SJan Schmidt } 3772d7728c96SJan Schmidt 3773d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3774d7728c96SJan Schmidt if (ret < 0) 3775d7728c96SJan Schmidt goto out; 3776d7728c96SJan Schmidt 3777d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3778745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3779745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3780740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3781d7728c96SJan Schmidt } 3782d7728c96SJan Schmidt 3783718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3784718dc5faSOmar Sandoval ipath->fspath, size); 3785d7728c96SJan Schmidt if (ret) { 3786d7728c96SJan Schmidt ret = -EFAULT; 3787d7728c96SJan Schmidt goto out; 3788d7728c96SJan Schmidt } 3789d7728c96SJan Schmidt 3790d7728c96SJan Schmidt out: 3791d7728c96SJan Schmidt btrfs_free_path(path); 3792d7728c96SJan Schmidt free_ipath(ipath); 3793d7728c96SJan Schmidt kfree(ipa); 3794d7728c96SJan Schmidt 3795d7728c96SJan Schmidt return ret; 3796d7728c96SJan Schmidt } 3797d7728c96SJan Schmidt 3798d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3799d7728c96SJan Schmidt { 3800d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3801d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3802d7728c96SJan Schmidt 3803d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3804d7728c96SJan Schmidt inodes->bytes_left -= c; 3805d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3806d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3807d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3808d7728c96SJan Schmidt inodes->elem_cnt += 3; 3809d7728c96SJan Schmidt } else { 3810d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3811d7728c96SJan Schmidt inodes->bytes_left = 0; 3812d7728c96SJan Schmidt inodes->elem_missed += 3; 3813d7728c96SJan Schmidt } 3814d7728c96SJan Schmidt 3815d7728c96SJan Schmidt return 0; 3816d7728c96SJan Schmidt } 3817d7728c96SJan Schmidt 38182ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3819d24a67b2SZygo Blaxell void __user *arg, int version) 3820d7728c96SJan Schmidt { 3821d7728c96SJan Schmidt int ret = 0; 3822d7728c96SJan Schmidt int size; 3823d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3824d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3825d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3826d24a67b2SZygo Blaxell bool ignore_offset; 3827d7728c96SJan Schmidt 3828d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3829d7728c96SJan Schmidt return -EPERM; 3830d7728c96SJan Schmidt 3831d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 38327b9ea627SShailendra Verma if (IS_ERR(loi)) 38337b9ea627SShailendra Verma return PTR_ERR(loi); 3834d7728c96SJan Schmidt 3835d24a67b2SZygo Blaxell if (version == 1) { 3836d24a67b2SZygo Blaxell ignore_offset = false; 3837b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 3838d24a67b2SZygo Blaxell } else { 3839d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 3840d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 3841d24a67b2SZygo Blaxell ret = -EINVAL; 3842d24a67b2SZygo Blaxell goto out_loi; 3843d24a67b2SZygo Blaxell } 3844d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 3845d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 3846d24a67b2SZygo Blaxell ret = -EINVAL; 3847d24a67b2SZygo Blaxell goto out_loi; 3848d24a67b2SZygo Blaxell } 3849d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 3850b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 3851d24a67b2SZygo Blaxell } 3852d24a67b2SZygo Blaxell 3853d7728c96SJan Schmidt path = btrfs_alloc_path(); 3854d7728c96SJan Schmidt if (!path) { 3855d7728c96SJan Schmidt ret = -ENOMEM; 3856d7728c96SJan Schmidt goto out; 3857d7728c96SJan Schmidt } 3858d7728c96SJan Schmidt 3859d7728c96SJan Schmidt inodes = init_data_container(size); 3860d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3861d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3862d7728c96SJan Schmidt inodes = NULL; 3863d7728c96SJan Schmidt goto out; 3864d7728c96SJan Schmidt } 3865d7728c96SJan Schmidt 38662ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 3867d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 3868df031f07SLiu Bo if (ret == -EINVAL) 3869d7728c96SJan Schmidt ret = -ENOENT; 3870d7728c96SJan Schmidt if (ret < 0) 3871d7728c96SJan Schmidt goto out; 3872d7728c96SJan Schmidt 3873718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 3874718dc5faSOmar Sandoval size); 3875d7728c96SJan Schmidt if (ret) 3876d7728c96SJan Schmidt ret = -EFAULT; 3877d7728c96SJan Schmidt 3878d7728c96SJan Schmidt out: 3879d7728c96SJan Schmidt btrfs_free_path(path); 3880f54de068SDavid Sterba kvfree(inodes); 3881d24a67b2SZygo Blaxell out_loi: 3882d7728c96SJan Schmidt kfree(loi); 3883d7728c96SJan Schmidt 3884d7728c96SJan Schmidt return ret; 3885d7728c96SJan Schmidt } 3886d7728c96SJan Schmidt 3887008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 3888c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3889c9e9f97bSIlya Dryomov { 3890c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3891c9e9f97bSIlya Dryomov 3892c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3893c9e9f97bSIlya Dryomov 38943009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 3895837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3896837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3897837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3898a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3899a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3900837d5b6eSIlya Dryomov 3901c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3902c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3903c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 390419a39dceSIlya Dryomov 390519a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 390619a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 390719a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 3908c9e9f97bSIlya Dryomov } 3909c9e9f97bSIlya Dryomov 39109ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3911c9e9f97bSIlya Dryomov { 3912496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3913c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3914c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3915c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3916ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 3917c9e9f97bSIlya Dryomov int ret; 3918c9e9f97bSIlya Dryomov 3919c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3920c9e9f97bSIlya Dryomov return -EPERM; 3921c9e9f97bSIlya Dryomov 3922e54bfa31SLiu Bo ret = mnt_want_write_file(file); 39239ba1f6e4SLiu Bo if (ret) 39249ba1f6e4SLiu Bo return ret; 39259ba1f6e4SLiu Bo 3926ed0fb78fSIlya Dryomov again: 3927c3e1f96cSGoldwyn Rodrigues if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 3928c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3929ed0fb78fSIlya Dryomov need_unlock = true; 3930ed0fb78fSIlya Dryomov goto locked; 3931ed0fb78fSIlya Dryomov } 3932ed0fb78fSIlya Dryomov 3933ed0fb78fSIlya Dryomov /* 393401327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 3935ed0fb78fSIlya Dryomov * (1) some other op is running 3936ed0fb78fSIlya Dryomov * (2) balance is running 3937ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 3938ed0fb78fSIlya Dryomov */ 3939ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3940ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3941ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 39423009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 3943ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3944dccdb07bSDavid Sterba /* 3945dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 3946dccdb07bSDavid Sterba * we'll reexamine the status again. 3947dccdb07bSDavid Sterba */ 3948ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3949ed0fb78fSIlya Dryomov 3950ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 39513009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 3952ed0fb78fSIlya Dryomov /* this is (3) */ 3953ed0fb78fSIlya Dryomov need_unlock = false; 3954ed0fb78fSIlya Dryomov goto locked; 3955ed0fb78fSIlya Dryomov } 3956ed0fb78fSIlya Dryomov 3957ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3958ed0fb78fSIlya Dryomov goto again; 3959ed0fb78fSIlya Dryomov } else { 3960ed0fb78fSIlya Dryomov /* this is (2) */ 3961ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3962ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 3963ed0fb78fSIlya Dryomov goto out; 3964ed0fb78fSIlya Dryomov } 3965ed0fb78fSIlya Dryomov } else { 3966ed0fb78fSIlya Dryomov /* this is (1) */ 3967ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3968e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3969ed0fb78fSIlya Dryomov goto out; 3970ed0fb78fSIlya Dryomov } 3971ed0fb78fSIlya Dryomov 3972ed0fb78fSIlya Dryomov locked: 3973c9e9f97bSIlya Dryomov 3974c9e9f97bSIlya Dryomov if (arg) { 3975c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 3976c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 3977c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 3978ed0fb78fSIlya Dryomov goto out_unlock; 3979c9e9f97bSIlya Dryomov } 3980de322263SIlya Dryomov 3981de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3982de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3983de322263SIlya Dryomov ret = -ENOTCONN; 3984de322263SIlya Dryomov goto out_bargs; 3985de322263SIlya Dryomov } 3986de322263SIlya Dryomov 3987de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3988de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3989de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3990de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3991de322263SIlya Dryomov 3992de322263SIlya Dryomov goto do_balance; 3993de322263SIlya Dryomov } 3994c9e9f97bSIlya Dryomov } else { 3995c9e9f97bSIlya Dryomov bargs = NULL; 3996c9e9f97bSIlya Dryomov } 3997c9e9f97bSIlya Dryomov 3998ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3999837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4000837d5b6eSIlya Dryomov goto out_bargs; 4001837d5b6eSIlya Dryomov } 4002837d5b6eSIlya Dryomov 40038d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4004c9e9f97bSIlya Dryomov if (!bctl) { 4005c9e9f97bSIlya Dryomov ret = -ENOMEM; 4006c9e9f97bSIlya Dryomov goto out_bargs; 4007c9e9f97bSIlya Dryomov } 4008c9e9f97bSIlya Dryomov 4009c9e9f97bSIlya Dryomov if (arg) { 4010c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4011c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4012c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4013c9e9f97bSIlya Dryomov 4014c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4015f43ffb60SIlya Dryomov } else { 4016f43ffb60SIlya Dryomov /* balance everything - no filters */ 4017f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4018c9e9f97bSIlya Dryomov } 4019c9e9f97bSIlya Dryomov 40208eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 40218eb93459SDavid Sterba ret = -EINVAL; 40220f89abf5SChristian Engelmayer goto out_bctl; 40238eb93459SDavid Sterba } 40248eb93459SDavid Sterba 4025de322263SIlya Dryomov do_balance: 4026c9e9f97bSIlya Dryomov /* 4027c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 4028c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 4029c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 4030c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 4031c9e9f97bSIlya Dryomov */ 4032ed0fb78fSIlya Dryomov need_unlock = false; 4033ed0fb78fSIlya Dryomov 40346fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 40350f89abf5SChristian Engelmayer bctl = NULL; 4036ed0fb78fSIlya Dryomov 4037d00c2d9cSFilipe Manana if ((ret == 0 || ret == -ECANCELED) && arg) { 4038c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4039c9e9f97bSIlya Dryomov ret = -EFAULT; 4040c9e9f97bSIlya Dryomov } 4041c9e9f97bSIlya Dryomov 40420f89abf5SChristian Engelmayer out_bctl: 40430f89abf5SChristian Engelmayer kfree(bctl); 4044c9e9f97bSIlya Dryomov out_bargs: 4045c9e9f97bSIlya Dryomov kfree(bargs); 4046ed0fb78fSIlya Dryomov out_unlock: 4047c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4048ed0fb78fSIlya Dryomov if (need_unlock) 4049c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 4050ed0fb78fSIlya Dryomov out: 4051e54bfa31SLiu Bo mnt_drop_write_file(file); 4052c9e9f97bSIlya Dryomov return ret; 4053c9e9f97bSIlya Dryomov } 4054c9e9f97bSIlya Dryomov 40552ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4056837d5b6eSIlya Dryomov { 4057837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4058837d5b6eSIlya Dryomov return -EPERM; 4059837d5b6eSIlya Dryomov 4060837d5b6eSIlya Dryomov switch (cmd) { 4061837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 40620b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4063a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 40640b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4065837d5b6eSIlya Dryomov } 4066837d5b6eSIlya Dryomov 4067837d5b6eSIlya Dryomov return -EINVAL; 4068837d5b6eSIlya Dryomov } 4069837d5b6eSIlya Dryomov 40702ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 407119a39dceSIlya Dryomov void __user *arg) 407219a39dceSIlya Dryomov { 407319a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 407419a39dceSIlya Dryomov int ret = 0; 407519a39dceSIlya Dryomov 407619a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 407719a39dceSIlya Dryomov return -EPERM; 407819a39dceSIlya Dryomov 407919a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 408019a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 408119a39dceSIlya Dryomov ret = -ENOTCONN; 408219a39dceSIlya Dryomov goto out; 408319a39dceSIlya Dryomov } 408419a39dceSIlya Dryomov 40858d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 408619a39dceSIlya Dryomov if (!bargs) { 408719a39dceSIlya Dryomov ret = -ENOMEM; 408819a39dceSIlya Dryomov goto out; 408919a39dceSIlya Dryomov } 409019a39dceSIlya Dryomov 4091008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 409219a39dceSIlya Dryomov 409319a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 409419a39dceSIlya Dryomov ret = -EFAULT; 409519a39dceSIlya Dryomov 409619a39dceSIlya Dryomov kfree(bargs); 409719a39dceSIlya Dryomov out: 409819a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 409919a39dceSIlya Dryomov return ret; 410019a39dceSIlya Dryomov } 410119a39dceSIlya Dryomov 4102905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 41035d13a37bSArne Jansen { 41040b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41050b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41065d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 41075d13a37bSArne Jansen int ret; 41085d13a37bSArne Jansen 41095d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41105d13a37bSArne Jansen return -EPERM; 41115d13a37bSArne Jansen 4112905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4113905b0ddaSMiao Xie if (ret) 4114905b0ddaSMiao Xie return ret; 41155d13a37bSArne Jansen 41165d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4117905b0ddaSMiao Xie if (IS_ERR(sa)) { 4118905b0ddaSMiao Xie ret = PTR_ERR(sa); 4119905b0ddaSMiao Xie goto drop_write; 4120905b0ddaSMiao Xie } 41215d13a37bSArne Jansen 41220b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 41235d13a37bSArne Jansen 41245d13a37bSArne Jansen switch (sa->cmd) { 41255d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4126340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 41275d13a37bSArne Jansen break; 41285d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4129340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 41305d13a37bSArne Jansen break; 41315d13a37bSArne Jansen default: 41325d13a37bSArne Jansen ret = -EINVAL; 41335d13a37bSArne Jansen break; 41345d13a37bSArne Jansen } 41355d13a37bSArne Jansen 41365d13a37bSArne Jansen kfree(sa); 41370b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4138905b0ddaSMiao Xie drop_write: 4139905b0ddaSMiao Xie mnt_drop_write_file(file); 41405d13a37bSArne Jansen return ret; 41415d13a37bSArne Jansen } 41425d13a37bSArne Jansen 4143905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 41445d13a37bSArne Jansen { 41450b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41460b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41470b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 41485d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 41495d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41505d13a37bSArne Jansen int ret; 41515d13a37bSArne Jansen int err; 41525d13a37bSArne Jansen 41535d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41545d13a37bSArne Jansen return -EPERM; 41555d13a37bSArne Jansen 4156905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4157905b0ddaSMiao Xie if (ret) 4158905b0ddaSMiao Xie return ret; 41595d13a37bSArne Jansen 41605d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4161905b0ddaSMiao Xie if (IS_ERR(sa)) { 4162905b0ddaSMiao Xie ret = PTR_ERR(sa); 4163905b0ddaSMiao Xie goto drop_write; 4164905b0ddaSMiao Xie } 41655d13a37bSArne Jansen 41665d13a37bSArne Jansen trans = btrfs_join_transaction(root); 41675d13a37bSArne Jansen if (IS_ERR(trans)) { 41685d13a37bSArne Jansen ret = PTR_ERR(trans); 41695d13a37bSArne Jansen goto out; 41705d13a37bSArne Jansen } 41715d13a37bSArne Jansen 41725d13a37bSArne Jansen if (sa->assign) { 41739f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 41745d13a37bSArne Jansen } else { 417539616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 41765d13a37bSArne Jansen } 41775d13a37bSArne Jansen 4178e082f563SQu Wenruo /* update qgroup status and info */ 4179280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4180e082f563SQu Wenruo if (err < 0) 41810b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4182ad8403dfSAnand Jain "failed to update qgroup status and info"); 41833a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 41845d13a37bSArne Jansen if (err && !ret) 41855d13a37bSArne Jansen ret = err; 41865d13a37bSArne Jansen 41875d13a37bSArne Jansen out: 41885d13a37bSArne Jansen kfree(sa); 4189905b0ddaSMiao Xie drop_write: 4190905b0ddaSMiao Xie mnt_drop_write_file(file); 41915d13a37bSArne Jansen return ret; 41925d13a37bSArne Jansen } 41935d13a37bSArne Jansen 4194905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 41955d13a37bSArne Jansen { 41960b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41970b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 41985d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 41995d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42005d13a37bSArne Jansen int ret; 42015d13a37bSArne Jansen int err; 42025d13a37bSArne Jansen 42035d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42045d13a37bSArne Jansen return -EPERM; 42055d13a37bSArne Jansen 4206905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4207905b0ddaSMiao Xie if (ret) 4208905b0ddaSMiao Xie return ret; 42095d13a37bSArne Jansen 42105d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4211905b0ddaSMiao Xie if (IS_ERR(sa)) { 4212905b0ddaSMiao Xie ret = PTR_ERR(sa); 4213905b0ddaSMiao Xie goto drop_write; 4214905b0ddaSMiao Xie } 42155d13a37bSArne Jansen 4216d86e56cfSMiao Xie if (!sa->qgroupid) { 4217d86e56cfSMiao Xie ret = -EINVAL; 4218d86e56cfSMiao Xie goto out; 4219d86e56cfSMiao Xie } 4220d86e56cfSMiao Xie 42215d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42225d13a37bSArne Jansen if (IS_ERR(trans)) { 42235d13a37bSArne Jansen ret = PTR_ERR(trans); 42245d13a37bSArne Jansen goto out; 42255d13a37bSArne Jansen } 42265d13a37bSArne Jansen 42275d13a37bSArne Jansen if (sa->create) { 422849a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 42295d13a37bSArne Jansen } else { 42303efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 42315d13a37bSArne Jansen } 42325d13a37bSArne Jansen 42333a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 42345d13a37bSArne Jansen if (err && !ret) 42355d13a37bSArne Jansen ret = err; 42365d13a37bSArne Jansen 42375d13a37bSArne Jansen out: 42385d13a37bSArne Jansen kfree(sa); 4239905b0ddaSMiao Xie drop_write: 4240905b0ddaSMiao Xie mnt_drop_write_file(file); 42415d13a37bSArne Jansen return ret; 42425d13a37bSArne Jansen } 42435d13a37bSArne Jansen 4244905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 42455d13a37bSArne Jansen { 42460b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42470b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42485d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 42495d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42505d13a37bSArne Jansen int ret; 42515d13a37bSArne Jansen int err; 42525d13a37bSArne Jansen u64 qgroupid; 42535d13a37bSArne Jansen 42545d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42555d13a37bSArne Jansen return -EPERM; 42565d13a37bSArne Jansen 4257905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4258905b0ddaSMiao Xie if (ret) 4259905b0ddaSMiao Xie return ret; 42605d13a37bSArne Jansen 42615d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4262905b0ddaSMiao Xie if (IS_ERR(sa)) { 4263905b0ddaSMiao Xie ret = PTR_ERR(sa); 4264905b0ddaSMiao Xie goto drop_write; 4265905b0ddaSMiao Xie } 42665d13a37bSArne Jansen 42675d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42685d13a37bSArne Jansen if (IS_ERR(trans)) { 42695d13a37bSArne Jansen ret = PTR_ERR(trans); 42705d13a37bSArne Jansen goto out; 42715d13a37bSArne Jansen } 42725d13a37bSArne Jansen 42735d13a37bSArne Jansen qgroupid = sa->qgroupid; 42745d13a37bSArne Jansen if (!qgroupid) { 42755d13a37bSArne Jansen /* take the current subvol as qgroup */ 42765d13a37bSArne Jansen qgroupid = root->root_key.objectid; 42775d13a37bSArne Jansen } 42785d13a37bSArne Jansen 4279f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 42805d13a37bSArne Jansen 42813a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 42825d13a37bSArne Jansen if (err && !ret) 42835d13a37bSArne Jansen ret = err; 42845d13a37bSArne Jansen 42855d13a37bSArne Jansen out: 42865d13a37bSArne Jansen kfree(sa); 4287905b0ddaSMiao Xie drop_write: 4288905b0ddaSMiao Xie mnt_drop_write_file(file); 42895d13a37bSArne Jansen return ret; 42905d13a37bSArne Jansen } 42915d13a37bSArne Jansen 42922f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 42932f232036SJan Schmidt { 42940b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42950b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42962f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 42972f232036SJan Schmidt int ret; 42982f232036SJan Schmidt 42992f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 43002f232036SJan Schmidt return -EPERM; 43012f232036SJan Schmidt 43022f232036SJan Schmidt ret = mnt_want_write_file(file); 43032f232036SJan Schmidt if (ret) 43042f232036SJan Schmidt return ret; 43052f232036SJan Schmidt 43062f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 43072f232036SJan Schmidt if (IS_ERR(qsa)) { 43082f232036SJan Schmidt ret = PTR_ERR(qsa); 43092f232036SJan Schmidt goto drop_write; 43102f232036SJan Schmidt } 43112f232036SJan Schmidt 43122f232036SJan Schmidt if (qsa->flags) { 43132f232036SJan Schmidt ret = -EINVAL; 43142f232036SJan Schmidt goto out; 43152f232036SJan Schmidt } 43162f232036SJan Schmidt 43170b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 43182f232036SJan Schmidt 43192f232036SJan Schmidt out: 43202f232036SJan Schmidt kfree(qsa); 43212f232036SJan Schmidt drop_write: 43222f232036SJan Schmidt mnt_drop_write_file(file); 43232f232036SJan Schmidt return ret; 43242f232036SJan Schmidt } 43252f232036SJan Schmidt 4326b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4327b929c1d8SMarcos Paulo de Souza void __user *arg) 43282f232036SJan Schmidt { 43292f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 43302f232036SJan Schmidt int ret = 0; 43312f232036SJan Schmidt 43322f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 43332f232036SJan Schmidt return -EPERM; 43342f232036SJan Schmidt 43358d2db785SDavid Sterba qsa = kzalloc(sizeof(*qsa), GFP_KERNEL); 43362f232036SJan Schmidt if (!qsa) 43372f232036SJan Schmidt return -ENOMEM; 43382f232036SJan Schmidt 43390b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 43402f232036SJan Schmidt qsa->flags = 1; 43410b246afaSJeff Mahoney qsa->progress = fs_info->qgroup_rescan_progress.objectid; 43422f232036SJan Schmidt } 43432f232036SJan Schmidt 43442f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 43452f232036SJan Schmidt ret = -EFAULT; 43462f232036SJan Schmidt 43472f232036SJan Schmidt kfree(qsa); 43482f232036SJan Schmidt return ret; 43492f232036SJan Schmidt } 43502f232036SJan Schmidt 4351b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4352b929c1d8SMarcos Paulo de Souza void __user *arg) 435357254b6eSJan Schmidt { 435457254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 435557254b6eSJan Schmidt return -EPERM; 435657254b6eSJan Schmidt 43570b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 435857254b6eSJan Schmidt } 435957254b6eSJan Schmidt 4360abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4361abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 43628ea05e3aSAlexander Block { 4363496ad9aaSAl Viro struct inode *inode = file_inode(file); 43640b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 43658ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 43668ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 43678ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 436895582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 43698ea05e3aSAlexander Block int ret = 0; 4370dd5f9615SStefan Behrens int received_uuid_changed; 43718ea05e3aSAlexander Block 437221cb47beSChristian Brauner if (!inode_owner_or_capable(&init_user_ns, inode)) 4373bd60ea0fSDavid Sterba return -EPERM; 4374bd60ea0fSDavid Sterba 43758ea05e3aSAlexander Block ret = mnt_want_write_file(file); 43768ea05e3aSAlexander Block if (ret < 0) 43778ea05e3aSAlexander Block return ret; 43788ea05e3aSAlexander Block 43790b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 43808ea05e3aSAlexander Block 43814a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 43828ea05e3aSAlexander Block ret = -EINVAL; 43838ea05e3aSAlexander Block goto out; 43848ea05e3aSAlexander Block } 43858ea05e3aSAlexander Block 43868ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 43878ea05e3aSAlexander Block ret = -EROFS; 43888ea05e3aSAlexander Block goto out; 43898ea05e3aSAlexander Block } 43908ea05e3aSAlexander Block 4391dd5f9615SStefan Behrens /* 4392dd5f9615SStefan Behrens * 1 - root item 4393dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4394dd5f9615SStefan Behrens */ 4395dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 43968ea05e3aSAlexander Block if (IS_ERR(trans)) { 43978ea05e3aSAlexander Block ret = PTR_ERR(trans); 43988ea05e3aSAlexander Block trans = NULL; 43998ea05e3aSAlexander Block goto out; 44008ea05e3aSAlexander Block } 44018ea05e3aSAlexander Block 44028ea05e3aSAlexander Block sa->rtransid = trans->transid; 44038ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 44048ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 44058ea05e3aSAlexander Block 4406dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4407dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4408dd5f9615SStefan Behrens if (received_uuid_changed && 4409d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4410d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4411dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4412dd5f9615SStefan Behrens root->root_key.objectid); 4413d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4414d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4415d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4416d87ff758SNikolay Borisov goto out; 4417d87ff758SNikolay Borisov } 4418d87ff758SNikolay Borisov } 44198ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 44208ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 44218ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 44223cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 44233cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 44243cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 44253cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 44268ea05e3aSAlexander Block 44270b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 44288ea05e3aSAlexander Block &root->root_key, &root->root_item); 44298ea05e3aSAlexander Block if (ret < 0) { 44303a45bb20SJeff Mahoney btrfs_end_transaction(trans); 44318ea05e3aSAlexander Block goto out; 4432dd5f9615SStefan Behrens } 4433dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4434cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4435dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4436dd5f9615SStefan Behrens root->root_key.objectid); 4437dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 443866642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4439efd38150SNikolay Borisov btrfs_end_transaction(trans); 4440dd5f9615SStefan Behrens goto out; 4441dd5f9615SStefan Behrens } 4442dd5f9615SStefan Behrens } 44433a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4444abccd00fSHugo Mills out: 44450b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4446abccd00fSHugo Mills mnt_drop_write_file(file); 4447abccd00fSHugo Mills return ret; 4448abccd00fSHugo Mills } 4449abccd00fSHugo Mills 4450abccd00fSHugo Mills #ifdef CONFIG_64BIT 4451abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4452abccd00fSHugo Mills void __user *arg) 4453abccd00fSHugo Mills { 4454abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4455abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4456abccd00fSHugo Mills int ret = 0; 4457abccd00fSHugo Mills 4458abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 44597b9ea627SShailendra Verma if (IS_ERR(args32)) 44607b9ea627SShailendra Verma return PTR_ERR(args32); 4461abccd00fSHugo Mills 44628d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 446384dbeb87SDan Carpenter if (!args64) { 446484dbeb87SDan Carpenter ret = -ENOMEM; 4465abccd00fSHugo Mills goto out; 4466abccd00fSHugo Mills } 4467abccd00fSHugo Mills 4468abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4469abccd00fSHugo Mills args64->stransid = args32->stransid; 4470abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4471abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4472abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4473abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4474abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4475abccd00fSHugo Mills args64->flags = args32->flags; 4476abccd00fSHugo Mills 4477abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4478abccd00fSHugo Mills if (ret) 4479abccd00fSHugo Mills goto out; 4480abccd00fSHugo Mills 4481abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4482abccd00fSHugo Mills args32->stransid = args64->stransid; 4483abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4484abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4485abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4486abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4487abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4488abccd00fSHugo Mills args32->flags = args64->flags; 4489abccd00fSHugo Mills 4490abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4491abccd00fSHugo Mills if (ret) 4492abccd00fSHugo Mills ret = -EFAULT; 4493abccd00fSHugo Mills 4494abccd00fSHugo Mills out: 4495abccd00fSHugo Mills kfree(args32); 4496abccd00fSHugo Mills kfree(args64); 4497abccd00fSHugo Mills return ret; 4498abccd00fSHugo Mills } 4499abccd00fSHugo Mills #endif 4500abccd00fSHugo Mills 4501abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4502abccd00fSHugo Mills void __user *arg) 4503abccd00fSHugo Mills { 4504abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4505abccd00fSHugo Mills int ret = 0; 4506abccd00fSHugo Mills 4507abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 45087b9ea627SShailendra Verma if (IS_ERR(sa)) 45097b9ea627SShailendra Verma return PTR_ERR(sa); 4510abccd00fSHugo Mills 4511abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4512abccd00fSHugo Mills 4513abccd00fSHugo Mills if (ret) 4514abccd00fSHugo Mills goto out; 4515abccd00fSHugo Mills 45168ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 45178ea05e3aSAlexander Block if (ret) 45188ea05e3aSAlexander Block ret = -EFAULT; 45198ea05e3aSAlexander Block 45208ea05e3aSAlexander Block out: 45218ea05e3aSAlexander Block kfree(sa); 45228ea05e3aSAlexander Block return ret; 45238ea05e3aSAlexander Block } 45248ea05e3aSAlexander Block 4525b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4526b929c1d8SMarcos Paulo de Souza void __user *arg) 4527867ab667Sjeff.liu { 4528a1b83ac5SAnand Jain size_t len; 4529867ab667Sjeff.liu int ret; 4530a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4531a1b83ac5SAnand Jain 45320b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 45330b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 45340b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4535a1b83ac5SAnand Jain 4536a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4537867ab667Sjeff.liu 4538867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 45390b246afaSJeff Mahoney btrfs_warn(fs_info, 45400b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 45410b246afaSJeff Mahoney --len); 4542867ab667Sjeff.liu } 4543867ab667Sjeff.liu 4544867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4545867ab667Sjeff.liu 4546867ab667Sjeff.liu return ret ? -EFAULT : 0; 4547867ab667Sjeff.liu } 4548867ab667Sjeff.liu 4549a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4550a8bfd4abSjeff.liu { 45510b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45520b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45530b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 45540b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4555a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4556a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4557a8bfd4abSjeff.liu int ret; 4558a8bfd4abSjeff.liu 4559a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4560a8bfd4abSjeff.liu return -EPERM; 4561a8bfd4abSjeff.liu 4562a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4563a8bfd4abSjeff.liu return -EFAULT; 4564a8bfd4abSjeff.liu 4565a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 45660b246afaSJeff Mahoney btrfs_err(fs_info, 45675d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4568a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4569a8bfd4abSjeff.liu return -EINVAL; 4570a8bfd4abSjeff.liu } 4571a8bfd4abSjeff.liu 4572a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4573a8bfd4abSjeff.liu if (ret) 4574a8bfd4abSjeff.liu return ret; 4575a8bfd4abSjeff.liu 4576a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4577a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4578a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4579a8bfd4abSjeff.liu goto out_unlock; 4580a8bfd4abSjeff.liu } 4581a8bfd4abSjeff.liu 45820b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4583a8bfd4abSjeff.liu strcpy(super_block->label, label); 45840b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 45853a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4586a8bfd4abSjeff.liu 4587a8bfd4abSjeff.liu out_unlock: 4588a8bfd4abSjeff.liu mnt_drop_write_file(file); 4589a8bfd4abSjeff.liu return ret; 4590a8bfd4abSjeff.liu } 4591a8bfd4abSjeff.liu 45922eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 45932eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 45942eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 45952eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 45962eaa055fSJeff Mahoney 4597d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 45982eaa055fSJeff Mahoney { 45994d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 46002eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 46012eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 46022eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 46032eaa055fSJeff Mahoney }; 46042eaa055fSJeff Mahoney 46052eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 46062eaa055fSJeff Mahoney return -EFAULT; 46072eaa055fSJeff Mahoney 46082eaa055fSJeff Mahoney return 0; 46092eaa055fSJeff Mahoney } 46102eaa055fSJeff Mahoney 4611b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4612b929c1d8SMarcos Paulo de Souza void __user *arg) 46132eaa055fSJeff Mahoney { 46140b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 46152eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 46162eaa055fSJeff Mahoney 46172eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 46182eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 46192eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 46202eaa055fSJeff Mahoney 46212eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 46222eaa055fSJeff Mahoney return -EFAULT; 46232eaa055fSJeff Mahoney 46242eaa055fSJeff Mahoney return 0; 46252eaa055fSJeff Mahoney } 46262eaa055fSJeff Mahoney 46272ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 46283b02a68aSJeff Mahoney enum btrfs_feature_set set, 46292eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 46302eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 46312eaa055fSJeff Mahoney { 4632f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 46333b02a68aSJeff Mahoney char *names; 46342eaa055fSJeff Mahoney u64 disallowed, unsupported; 46352eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 46362eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 46372eaa055fSJeff Mahoney 46382eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 46392eaa055fSJeff Mahoney if (unsupported) { 46403b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 46413b02a68aSJeff Mahoney if (names) { 46420b246afaSJeff Mahoney btrfs_warn(fs_info, 46433b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 46443b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46453b02a68aSJeff Mahoney kfree(names); 46463b02a68aSJeff Mahoney } else 46470b246afaSJeff Mahoney btrfs_warn(fs_info, 46482eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 46492eaa055fSJeff Mahoney type, unsupported); 46502eaa055fSJeff Mahoney return -EOPNOTSUPP; 46512eaa055fSJeff Mahoney } 46522eaa055fSJeff Mahoney 46532eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 46542eaa055fSJeff Mahoney if (disallowed) { 46553b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 46563b02a68aSJeff Mahoney if (names) { 46570b246afaSJeff Mahoney btrfs_warn(fs_info, 46583b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 46593b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46603b02a68aSJeff Mahoney kfree(names); 46613b02a68aSJeff Mahoney } else 46620b246afaSJeff Mahoney btrfs_warn(fs_info, 46632eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 46642eaa055fSJeff Mahoney type, disallowed); 46652eaa055fSJeff Mahoney return -EPERM; 46662eaa055fSJeff Mahoney } 46672eaa055fSJeff Mahoney 46682eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 46692eaa055fSJeff Mahoney if (disallowed) { 46703b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 46713b02a68aSJeff Mahoney if (names) { 46720b246afaSJeff Mahoney btrfs_warn(fs_info, 46733b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 46743b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46753b02a68aSJeff Mahoney kfree(names); 46763b02a68aSJeff Mahoney } else 46770b246afaSJeff Mahoney btrfs_warn(fs_info, 46782eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 46792eaa055fSJeff Mahoney type, disallowed); 46802eaa055fSJeff Mahoney return -EPERM; 46812eaa055fSJeff Mahoney } 46822eaa055fSJeff Mahoney 46832eaa055fSJeff Mahoney return 0; 46842eaa055fSJeff Mahoney } 46852eaa055fSJeff Mahoney 46862ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 46872ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 46882eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 46892eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 46902eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 46912eaa055fSJeff Mahoney 46922eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 46932eaa055fSJeff Mahoney { 46940b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46950b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 46960b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46970b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 46982eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 46992eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 47002eaa055fSJeff Mahoney u64 newflags; 47012eaa055fSJeff Mahoney int ret; 47022eaa055fSJeff Mahoney 47032eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 47042eaa055fSJeff Mahoney return -EPERM; 47052eaa055fSJeff Mahoney 47062eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 47072eaa055fSJeff Mahoney return -EFAULT; 47082eaa055fSJeff Mahoney 47092eaa055fSJeff Mahoney /* Nothing to do */ 47102eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 47112eaa055fSJeff Mahoney !flags[0].incompat_flags) 47122eaa055fSJeff Mahoney return 0; 47132eaa055fSJeff Mahoney 47142ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 47152eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 47162eaa055fSJeff Mahoney if (ret) 47172eaa055fSJeff Mahoney return ret; 47182eaa055fSJeff Mahoney 47192ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 47202eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 47212eaa055fSJeff Mahoney if (ret) 47222eaa055fSJeff Mahoney return ret; 47232eaa055fSJeff Mahoney 47242ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 47252eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 47262eaa055fSJeff Mahoney if (ret) 47272eaa055fSJeff Mahoney return ret; 47282eaa055fSJeff Mahoney 47297ab19625SDavid Sterba ret = mnt_want_write_file(file); 47307ab19625SDavid Sterba if (ret) 47317ab19625SDavid Sterba return ret; 47327ab19625SDavid Sterba 47338051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 47347ab19625SDavid Sterba if (IS_ERR(trans)) { 47357ab19625SDavid Sterba ret = PTR_ERR(trans); 47367ab19625SDavid Sterba goto out_drop_write; 47377ab19625SDavid Sterba } 47382eaa055fSJeff Mahoney 47390b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 47402eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 47412eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 47422eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 47432eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 47442eaa055fSJeff Mahoney 47452eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 47462eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 47472eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 47482eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 47492eaa055fSJeff Mahoney 47502eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 47512eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 47522eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 47532eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 47540b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 47552eaa055fSJeff Mahoney 47563a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 47577ab19625SDavid Sterba out_drop_write: 47587ab19625SDavid Sterba mnt_drop_write_file(file); 47597ab19625SDavid Sterba 47607ab19625SDavid Sterba return ret; 47612eaa055fSJeff Mahoney } 47622eaa055fSJeff Mahoney 47632351f431SJosef Bacik static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) 47642351f431SJosef Bacik { 47652351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 47662351f431SJosef Bacik int ret; 47672351f431SJosef Bacik 47682351f431SJosef Bacik if (compat) { 47692351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 47702351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 47712351f431SJosef Bacik 47722351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 47732351f431SJosef Bacik if (ret) 47742351f431SJosef Bacik return -EFAULT; 47752351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 47762351f431SJosef Bacik if (!arg) 47772351f431SJosef Bacik return -ENOMEM; 47782351f431SJosef Bacik arg->send_fd = args32.send_fd; 47792351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 47802351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 47812351f431SJosef Bacik arg->parent_root = args32.parent_root; 47822351f431SJosef Bacik arg->flags = args32.flags; 47832351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 47842351f431SJosef Bacik sizeof(args32.reserved)); 47852351f431SJosef Bacik #else 47862351f431SJosef Bacik return -ENOTTY; 47872351f431SJosef Bacik #endif 47882351f431SJosef Bacik } else { 47892351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 47902351f431SJosef Bacik if (IS_ERR(arg)) 47912351f431SJosef Bacik return PTR_ERR(arg); 47922351f431SJosef Bacik } 47932351f431SJosef Bacik ret = btrfs_ioctl_send(file, arg); 47942351f431SJosef Bacik kfree(arg); 47952351f431SJosef Bacik return ret; 47962351f431SJosef Bacik } 47972351f431SJosef Bacik 4798f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4799f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4800f46b5a66SChristoph Hellwig { 48010b246afaSJeff Mahoney struct inode *inode = file_inode(file); 48020b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 48030b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 48044bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4805f46b5a66SChristoph Hellwig 4806f46b5a66SChristoph Hellwig switch (cmd) { 48076cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 48086cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 480940cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4810b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 481140cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 481240cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4813f7039b1dSLi Dongyang case FITRIM: 4814b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4815f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4816fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4817fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4818fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 48193de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4820fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 48216f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 48226f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 482376dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4824949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4825949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4826949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 48270caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 48280caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 48290caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 48300caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 48316ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 48326ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4833f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 48341e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 48351e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 48361e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4837f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4838198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4839f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 48402ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 4841f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4842da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 48436b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 48446b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 4845475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 48462ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 4847475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 48482ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 4849f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 48509ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4851ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4852ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4853cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 4854cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 4855ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4856ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4857d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4858d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4859d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4860d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 4861d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 4862d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 48631406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 48642ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 48659b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 48669b199859SFilipe David Borba Manana int ret; 48679b199859SFilipe David Borba Manana 48689db4dc24SNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 48699b199859SFilipe David Borba Manana if (ret) 48709b199859SFilipe David Borba Manana return ret; 48710b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 48722fad4e83SDavid Sterba /* 48732fad4e83SDavid Sterba * The transaction thread may want to do more work, 487401327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 48752fad4e83SDavid Sterba * processing uncleaned subvols. 48762fad4e83SDavid Sterba */ 48770b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 48789b199859SFilipe David Borba Manana return ret; 48799b199859SFilipe David Borba Manana } 488046204592SSage Weil case BTRFS_IOC_START_SYNC: 48819a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 488246204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 48832ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 4884475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4885b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4886475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 48872ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 4888475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 48892ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 4890c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 48919ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4892837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 48932ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 489419a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 48952ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 48968ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 48978ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 4898abccd00fSHugo Mills #ifdef CONFIG_64BIT 4899abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 4900abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 4901abccd00fSHugo Mills #endif 490231db9f7cSAlexander Block case BTRFS_IOC_SEND: 49032351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, false); 49042351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 49052351f431SJosef Bacik case BTRFS_IOC_SEND_32: 49062351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, true); 49072351f431SJosef Bacik #endif 4908c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 49092ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 49105d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4911905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 49125d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4913905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 49145d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4915905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 49165d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4917905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 49182f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 49192f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 49202f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 4921b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 492257254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 4923b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 49243f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 49252ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 49262eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 4927d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 49282eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 4929b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 49302eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 49312eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 4932b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 4933b64ec075STomohiro Misono return btrfs_ioctl_get_subvol_info(file, argp); 493442e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 493542e4b520STomohiro Misono return btrfs_ioctl_get_subvol_rootref(file, argp); 493623d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 493723d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 4938f46b5a66SChristoph Hellwig } 4939f46b5a66SChristoph Hellwig 4940f46b5a66SChristoph Hellwig return -ENOTTY; 4941f46b5a66SChristoph Hellwig } 49424c63c245SLuke Dashjr 49434c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 49444c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 49454c63c245SLuke Dashjr { 49462a362249SJeff Mahoney /* 49472a362249SJeff Mahoney * These all access 32-bit values anyway so no further 49482a362249SJeff Mahoney * handling is necessary. 49492a362249SJeff Mahoney */ 49504c63c245SLuke Dashjr switch (cmd) { 49514c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 49524c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 49534c63c245SLuke Dashjr break; 49544c63c245SLuke Dashjr } 49554c63c245SLuke Dashjr 49564c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 49574c63c245SLuke Dashjr } 49584c63c245SLuke Dashjr #endif 4959