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 3560d7ed32cSDavid Sterba /* 3570d7ed32cSDavid Sterba * Start exclusive operation @type, return true on success 3580d7ed32cSDavid Sterba */ 359c3e1f96cSGoldwyn Rodrigues bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, 360c3e1f96cSGoldwyn Rodrigues enum btrfs_exclusive_operation type) 361c3e1f96cSGoldwyn Rodrigues { 3620d7ed32cSDavid Sterba bool ret = false; 3630d7ed32cSDavid Sterba 3640d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 3650d7ed32cSDavid Sterba if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) { 3660d7ed32cSDavid Sterba fs_info->exclusive_operation = type; 3670d7ed32cSDavid Sterba ret = true; 3680d7ed32cSDavid Sterba } 3690d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 3700d7ed32cSDavid Sterba 3710d7ed32cSDavid Sterba return ret; 372c3e1f96cSGoldwyn Rodrigues } 373c3e1f96cSGoldwyn Rodrigues 374578bda9eSDavid Sterba /* 375578bda9eSDavid Sterba * Conditionally allow to enter the exclusive operation in case it's compatible 376578bda9eSDavid Sterba * with the running one. This must be paired with btrfs_exclop_start_unlock and 377578bda9eSDavid Sterba * btrfs_exclop_finish. 378578bda9eSDavid Sterba * 379578bda9eSDavid Sterba * Compatibility: 380578bda9eSDavid Sterba * - the same type is already running 381578bda9eSDavid Sterba * - not BTRFS_EXCLOP_NONE - this is intentionally incompatible and the caller 382578bda9eSDavid Sterba * must check the condition first that would allow none -> @type 383578bda9eSDavid Sterba */ 384578bda9eSDavid Sterba bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info, 385578bda9eSDavid Sterba enum btrfs_exclusive_operation type) 386578bda9eSDavid Sterba { 387578bda9eSDavid Sterba spin_lock(&fs_info->super_lock); 388578bda9eSDavid Sterba if (fs_info->exclusive_operation == type) 389578bda9eSDavid Sterba return true; 390578bda9eSDavid Sterba 391578bda9eSDavid Sterba spin_unlock(&fs_info->super_lock); 392578bda9eSDavid Sterba return false; 393578bda9eSDavid Sterba } 394578bda9eSDavid Sterba 395578bda9eSDavid Sterba void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info) 396578bda9eSDavid Sterba { 397578bda9eSDavid Sterba spin_unlock(&fs_info->super_lock); 398578bda9eSDavid Sterba } 399578bda9eSDavid Sterba 400c3e1f96cSGoldwyn Rodrigues void btrfs_exclop_finish(struct btrfs_fs_info *fs_info) 401c3e1f96cSGoldwyn Rodrigues { 4020d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 403c3e1f96cSGoldwyn Rodrigues WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE); 4040d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 40566a2823cSGoldwyn Rodrigues sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation"); 406c3e1f96cSGoldwyn Rodrigues } 407c3e1f96cSGoldwyn Rodrigues 4086cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 4096cbff00fSChristoph Hellwig { 410496ad9aaSAl Viro struct inode *inode = file_inode(file); 4116cbff00fSChristoph Hellwig 4126cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 4136cbff00fSChristoph Hellwig } 414f46b5a66SChristoph Hellwig 415b929c1d8SMarcos Paulo de Souza static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, 416b929c1d8SMarcos Paulo de Souza void __user *arg) 417f7039b1dSLi Dongyang { 418f7039b1dSLi Dongyang struct btrfs_device *device; 419f7039b1dSLi Dongyang struct request_queue *q; 420f7039b1dSLi Dongyang struct fstrim_range range; 421f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 422f7039b1dSLi Dongyang u64 num_devices = 0; 423f7039b1dSLi Dongyang int ret; 424f7039b1dSLi Dongyang 425f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 426f7039b1dSLi Dongyang return -EPERM; 427f7039b1dSLi Dongyang 428f35f06c3SFilipe Manana /* 4291cb3dc3fSNaohiro Aota * btrfs_trim_block_group() depends on space cache, which is not 4301cb3dc3fSNaohiro Aota * available in zoned filesystem. So, disallow fitrim on a zoned 4311cb3dc3fSNaohiro Aota * filesystem for now. 4321cb3dc3fSNaohiro Aota */ 4331cb3dc3fSNaohiro Aota if (btrfs_is_zoned(fs_info)) 4341cb3dc3fSNaohiro Aota return -EOPNOTSUPP; 4351cb3dc3fSNaohiro Aota 4361cb3dc3fSNaohiro Aota /* 437f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 438f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 439f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 440f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 441f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 442f35f06c3SFilipe Manana */ 443f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 444f35f06c3SFilipe Manana return -EROFS; 445f35f06c3SFilipe Manana 4461f78160cSXiao Guangrong rcu_read_lock(); 4471f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 4481f78160cSXiao Guangrong dev_list) { 449f7039b1dSLi Dongyang if (!device->bdev) 450f7039b1dSLi Dongyang continue; 451f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 452f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 453f7039b1dSLi Dongyang num_devices++; 45450d0446eSSeraphime Kirkovski minlen = min_t(u64, q->limits.discard_granularity, 455f7039b1dSLi Dongyang minlen); 456f7039b1dSLi Dongyang } 457f7039b1dSLi Dongyang } 4581f78160cSXiao Guangrong rcu_read_unlock(); 459f4c697e6SLukas Czerner 460f7039b1dSLi Dongyang if (!num_devices) 461f7039b1dSLi Dongyang return -EOPNOTSUPP; 462f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 463f7039b1dSLi Dongyang return -EFAULT; 4646ba9fc8eSQu Wenruo 4656ba9fc8eSQu Wenruo /* 4666ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 4676ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 4686ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 4696ba9fc8eSQu Wenruo */ 4706ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 471f4c697e6SLukas Czerner return -EINVAL; 472f7039b1dSLi Dongyang 473f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 4742ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 475f7039b1dSLi Dongyang if (ret < 0) 476f7039b1dSLi Dongyang return ret; 477f7039b1dSLi Dongyang 478f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 479f7039b1dSLi Dongyang return -EFAULT; 480f7039b1dSLi Dongyang 481f7039b1dSLi Dongyang return 0; 482f7039b1dSLi Dongyang } 483f7039b1dSLi Dongyang 484e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 485dd5f9615SStefan Behrens { 48646e0f66aSChris Mason int i; 48746e0f66aSChris Mason 48846e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 48946e0f66aSChris Mason if (uuid[i]) 49046e0f66aSChris Mason return 0; 49146e0f66aSChris Mason } 49246e0f66aSChris Mason return 1; 493dd5f9615SStefan Behrens } 494dd5f9615SStefan Behrens 495d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 496cb8e7090SChristoph Hellwig struct dentry *dentry, 49752f75f4fSDavid Sterba const char *name, int namelen, 4988696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 499f46b5a66SChristoph Hellwig { 5000b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 501f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 502f46b5a66SChristoph Hellwig struct btrfs_key key; 50349a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 504f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 505f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 506d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 50776dda93cSYan, Zheng struct btrfs_root *new_root; 508d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 50995582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 5105662344bSTsutomu Itoh struct inode *inode; 511f46b5a66SChristoph Hellwig int ret; 512f46b5a66SChristoph Hellwig int err; 5132dfb1e43SQu Wenruo dev_t anon_dev = 0; 514f46b5a66SChristoph Hellwig u64 objectid; 5153de4586cSChris Mason u64 index = 0; 516f46b5a66SChristoph Hellwig 51749a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 51849a3c4d9SDavid Sterba if (!root_item) 51949a3c4d9SDavid Sterba return -ENOMEM; 52049a3c4d9SDavid Sterba 521543068a2SNikolay Borisov ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); 5222fbe8c8aSAl Viro if (ret) 52349a3c4d9SDavid Sterba goto fail_free; 5246a912213SJosef Bacik 5252dfb1e43SQu Wenruo ret = get_anon_bdev(&anon_dev); 5262dfb1e43SQu Wenruo if (ret < 0) 5272dfb1e43SQu Wenruo goto fail_free; 5282dfb1e43SQu Wenruo 529e09fe2d2SQu Wenruo /* 530e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 53101327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 532e09fe2d2SQu Wenruo */ 53349a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 53449a3c4d9SDavid Sterba ret = -ENOSPC; 53549a3c4d9SDavid Sterba goto fail_free; 53649a3c4d9SDavid Sterba } 537e09fe2d2SQu Wenruo 538d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 5399ed74f2dSJosef Bacik /* 540d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 541d5c12070SMiao Xie * of create_snapshot(). 5429ed74f2dSJosef Bacik */ 543c4c129dbSGu JinXiang ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false); 544d5c12070SMiao Xie if (ret) 54549a3c4d9SDavid Sterba goto fail_free; 546f46b5a66SChristoph Hellwig 547d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 548d5c12070SMiao Xie if (IS_ERR(trans)) { 549d5c12070SMiao Xie ret = PTR_ERR(trans); 550e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 55149a3c4d9SDavid Sterba goto fail_free; 552d5c12070SMiao Xie } 553d5c12070SMiao Xie trans->block_rsv = &block_rsv; 554d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 555f46b5a66SChristoph Hellwig 556a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 5576f72c7e2SArne Jansen if (ret) 5586f72c7e2SArne Jansen goto fail; 5596f72c7e2SArne Jansen 5609631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 5619631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 5628e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 5638e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 5648e8a1e31SJosef Bacik goto fail; 5658e8a1e31SJosef Bacik } 566f46b5a66SChristoph Hellwig 567f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 568f46b5a66SChristoph Hellwig 56949a3c4d9SDavid Sterba inode_item = &root_item->inode; 5703cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 5713cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 5723cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 573da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 5740b246afaSJeff Mahoney fs_info->nodesize); 5753cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 576f46b5a66SChristoph Hellwig 57749a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 57849a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 5793cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 58008fe4db1SLi Zefan 58149a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 58249a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 58349a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 58449a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 58549a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 58649a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 587f46b5a66SChristoph Hellwig 58849a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 58949a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 590807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 59149a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 59249a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 59349a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 59449a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 59549a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 596f46b5a66SChristoph Hellwig 597925baeddSChris Mason btrfs_tree_unlock(leaf); 598f46b5a66SChristoph Hellwig 59969948022SNikolay Borisov btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); 600f46b5a66SChristoph Hellwig 601f46b5a66SChristoph Hellwig key.objectid = objectid; 6025d4f98a2SYan Zheng key.offset = 0; 603962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 6040b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 60549a3c4d9SDavid Sterba root_item); 60667addf29SFilipe Manana if (ret) { 60767addf29SFilipe Manana /* 60867addf29SFilipe Manana * Since we don't abort the transaction in this case, free the 60967addf29SFilipe Manana * tree block so that we don't leak space and leave the 61067addf29SFilipe Manana * filesystem in an inconsistent state (an extent item in the 61167addf29SFilipe Manana * extent tree without backreferences). Also no need to have 61267addf29SFilipe Manana * the tree block locked since it is not in any tree at this 61367addf29SFilipe Manana * point, so no other task can find it and use it. 61467addf29SFilipe Manana */ 61567addf29SFilipe Manana btrfs_free_tree_block(trans, root, leaf, 0, 1); 61667addf29SFilipe Manana free_extent_buffer(leaf); 617f46b5a66SChristoph Hellwig goto fail; 61867addf29SFilipe Manana } 61967addf29SFilipe Manana 62067addf29SFilipe Manana free_extent_buffer(leaf); 62167addf29SFilipe Manana leaf = NULL; 622f46b5a66SChristoph Hellwig 62376dda93cSYan, Zheng key.offset = (u64)-1; 6242dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 62579787eaaSJeff Mahoney if (IS_ERR(new_root)) { 6262dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 62779787eaaSJeff Mahoney ret = PTR_ERR(new_root); 62866642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 62979787eaaSJeff Mahoney goto fail; 63079787eaaSJeff Mahoney } 6312dfb1e43SQu Wenruo /* Freeing will be done in btrfs_put_root() of new_root */ 6322dfb1e43SQu Wenruo anon_dev = 0; 63376dda93cSYan, Zheng 634221581e4SJosef Bacik ret = btrfs_record_root_in_trans(trans, new_root); 635221581e4SJosef Bacik if (ret) { 636221581e4SJosef Bacik btrfs_put_root(new_root); 637221581e4SJosef Bacik btrfs_abort_transaction(trans, ret); 638221581e4SJosef Bacik goto fail; 639221581e4SJosef Bacik } 64076dda93cSYan, Zheng 64169948022SNikolay Borisov ret = btrfs_create_subvol_root(trans, new_root, root); 64200246528SJosef Bacik btrfs_put_root(new_root); 643ce598979SMark Fasheh if (ret) { 644ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 64566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 646ce598979SMark Fasheh goto fail; 647ce598979SMark Fasheh } 648ce598979SMark Fasheh 649f46b5a66SChristoph Hellwig /* 650f46b5a66SChristoph Hellwig * insert the directory item 651f46b5a66SChristoph Hellwig */ 652877574e2SNikolay Borisov ret = btrfs_set_inode_index(BTRFS_I(dir), &index); 65379787eaaSJeff Mahoney if (ret) { 65466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 65579787eaaSJeff Mahoney goto fail; 65679787eaaSJeff Mahoney } 6573de4586cSChris Mason 658684572dfSLu Fengqi ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key, 6593de4586cSChris Mason BTRFS_FT_DIR, index); 66079787eaaSJeff Mahoney if (ret) { 66166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 662f46b5a66SChristoph Hellwig goto fail; 66379787eaaSJeff Mahoney } 6640660b5afSChris Mason 6656ef06d27SNikolay Borisov btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); 6669a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(dir)); 667c7e54b51SJosef Bacik if (ret) { 668c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 669c7e54b51SJosef Bacik goto fail; 670c7e54b51SJosef Bacik } 67152c26179SYan Zheng 6726025c19fSLu Fengqi ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid, 6734a0cc7caSNikolay Borisov btrfs_ino(BTRFS_I(dir)), index, name, namelen); 674c7e54b51SJosef Bacik if (ret) { 675c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 676c7e54b51SJosef Bacik goto fail; 677c7e54b51SJosef Bacik } 6780660b5afSChris Mason 679cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 6806bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 681dd5f9615SStefan Behrens if (ret) 68266642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 683dd5f9615SStefan Behrens 684f46b5a66SChristoph Hellwig fail: 68549a3c4d9SDavid Sterba kfree(root_item); 686d5c12070SMiao Xie trans->block_rsv = NULL; 687d5c12070SMiao Xie trans->bytes_reserved = 0; 688e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 689de6e8200SLiu Bo 6903a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 691f46b5a66SChristoph Hellwig if (err && !ret) 692f46b5a66SChristoph Hellwig ret = err; 6931a65e24bSChris Mason 6945662344bSTsutomu Itoh if (!ret) { 6955662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 696de6e8200SLiu Bo if (IS_ERR(inode)) 697de6e8200SLiu Bo return PTR_ERR(inode); 6985662344bSTsutomu Itoh d_instantiate(dentry, inode); 6995662344bSTsutomu Itoh } 700f46b5a66SChristoph Hellwig return ret; 70149a3c4d9SDavid Sterba 70249a3c4d9SDavid Sterba fail_free: 7032dfb1e43SQu Wenruo if (anon_dev) 7042dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 70549a3c4d9SDavid Sterba kfree(root_item); 70649a3c4d9SDavid Sterba return ret; 707f46b5a66SChristoph Hellwig } 708f46b5a66SChristoph Hellwig 709e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7109babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 711e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 712f46b5a66SChristoph Hellwig { 7130b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7142e4bfab9SYan, Zheng struct inode *inode; 715f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 716f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7172e4bfab9SYan, Zheng int ret; 718f46b5a66SChristoph Hellwig 71992a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 720f46b5a66SChristoph Hellwig return -EINVAL; 721f46b5a66SChristoph Hellwig 722eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 723eede2bf3SOmar Sandoval btrfs_warn(fs_info, 724eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 725eede2bf3SOmar Sandoval return -ETXTBSY; 726eede2bf3SOmar Sandoval } 727eede2bf3SOmar Sandoval 72823269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 729a1ee7362SDavid Sterba if (!pending_snapshot) 730a1ee7362SDavid Sterba return -ENOMEM; 731a1ee7362SDavid Sterba 7322dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 7332dfb1e43SQu Wenruo if (ret < 0) 7342dfb1e43SQu Wenruo goto free_pending; 735b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 73623269bf5SDavid Sterba GFP_KERNEL); 7378546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 7388546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 739b0c0ea63SDavid Sterba ret = -ENOMEM; 740b0c0ea63SDavid Sterba goto free_pending; 741b0c0ea63SDavid Sterba } 742b0c0ea63SDavid Sterba 74366d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 74466d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 745d5c12070SMiao Xie /* 746d5c12070SMiao Xie * 1 - parent dir inode 747d5c12070SMiao Xie * 2 - dir entries 748d5c12070SMiao Xie * 1 - root item 749d5c12070SMiao Xie * 2 - root ref/backref 750d5c12070SMiao Xie * 1 - root of snapshot 751dd5f9615SStefan Behrens * 1 - UUID item 752d5c12070SMiao Xie */ 753d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 754dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 755ee3441b4SJeff Mahoney false); 756d5c12070SMiao Xie if (ret) 757c11fbb6eSRobbie Ko goto free_pending; 758d5c12070SMiao Xie 759a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 760a22285a6SYan, Zheng pending_snapshot->root = root; 761b83cc969SLi Zefan pending_snapshot->readonly = readonly; 762e9662f70SMiao Xie pending_snapshot->dir = dir; 7638696c533SMiao Xie pending_snapshot->inherit = inherit; 764a22285a6SYan, Zheng 765d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 766a22285a6SYan, Zheng if (IS_ERR(trans)) { 767a22285a6SYan, Zheng ret = PTR_ERR(trans); 768a22285a6SYan, Zheng goto fail; 769a22285a6SYan, Zheng } 770a22285a6SYan, Zheng 7710b246afaSJeff Mahoney spin_lock(&fs_info->trans_lock); 772a22285a6SYan, Zheng list_add(&pending_snapshot->list, 773a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 7740b246afaSJeff Mahoney spin_unlock(&fs_info->trans_lock); 7759babda9fSNikolay Borisov 7763a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 777aec8030aSMiao Xie if (ret) 778c37b2b62SJosef Bacik goto fail; 779a22285a6SYan, Zheng 780a22285a6SYan, Zheng ret = pending_snapshot->error; 781f46b5a66SChristoph Hellwig if (ret) 7822e4bfab9SYan, Zheng goto fail; 783f46b5a66SChristoph Hellwig 784d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 785d3797308SChris Mason if (ret) 786d3797308SChris Mason goto fail; 787d3797308SChris Mason 7882b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 7892e4bfab9SYan, Zheng if (IS_ERR(inode)) { 7902e4bfab9SYan, Zheng ret = PTR_ERR(inode); 7912e4bfab9SYan, Zheng goto fail; 7922e4bfab9SYan, Zheng } 7935662344bSTsutomu Itoh 7942e4bfab9SYan, Zheng d_instantiate(dentry, inode); 7952e4bfab9SYan, Zheng ret = 0; 7962dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 7972e4bfab9SYan, Zheng fail: 7982dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 7992dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8002dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 80100246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 802e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 803b0c0ea63SDavid Sterba free_pending: 8042dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8052dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 806b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8078546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 808a1ee7362SDavid Sterba kfree(pending_snapshot); 809a1ee7362SDavid Sterba 810f46b5a66SChristoph Hellwig return ret; 811f46b5a66SChristoph Hellwig } 812f46b5a66SChristoph Hellwig 8134260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8144260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8154260f7c7SSage Weil * whether the type of victim is right. 8164260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8174260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8184260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8194260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8204260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8214260f7c7SSage Weil * a. be owner of dir, or 8224260f7c7SSage Weil * b. be owner of victim, or 8234260f7c7SSage Weil * c. have CAP_FOWNER capability 82401327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 8254260f7c7SSage Weil * links pointing to it. 8264260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8274260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 8284260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 8294260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 8304260f7c7SSage Weil * nfs_async_unlink(). 8314260f7c7SSage Weil */ 8324260f7c7SSage Weil 8334260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 8344260f7c7SSage Weil { 8354260f7c7SSage Weil int error; 8364260f7c7SSage Weil 8372b0143b5SDavid Howells if (d_really_is_negative(victim)) 8384260f7c7SSage Weil return -ENOENT; 8394260f7c7SSage Weil 8402b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 8414fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 8424260f7c7SSage Weil 84347291baaSChristian Brauner error = inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC); 8444260f7c7SSage Weil if (error) 8454260f7c7SSage Weil return error; 8464260f7c7SSage Weil if (IS_APPEND(dir)) 8474260f7c7SSage Weil return -EPERM; 848ba73d987SChristian Brauner if (check_sticky(&init_user_ns, dir, d_inode(victim)) || 849ba73d987SChristian Brauner IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) || 850ba73d987SChristian Brauner IS_SWAPFILE(d_inode(victim))) 8514260f7c7SSage Weil return -EPERM; 8524260f7c7SSage Weil if (isdir) { 853e36cb0b8SDavid Howells if (!d_is_dir(victim)) 8544260f7c7SSage Weil return -ENOTDIR; 8554260f7c7SSage Weil if (IS_ROOT(victim)) 8564260f7c7SSage Weil return -EBUSY; 857e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 8584260f7c7SSage Weil return -EISDIR; 8594260f7c7SSage Weil if (IS_DEADDIR(dir)) 8604260f7c7SSage Weil return -ENOENT; 8614260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 8624260f7c7SSage Weil return -EBUSY; 8634260f7c7SSage Weil return 0; 8644260f7c7SSage Weil } 8654260f7c7SSage Weil 866cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 867cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 868cb8e7090SChristoph Hellwig { 8692b0143b5SDavid Howells if (d_really_is_positive(child)) 870cb8e7090SChristoph Hellwig return -EEXIST; 871cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 872cb8e7090SChristoph Hellwig return -ENOENT; 87347291baaSChristian Brauner return inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC); 874cb8e7090SChristoph Hellwig } 875cb8e7090SChristoph Hellwig 876cb8e7090SChristoph Hellwig /* 877cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 878cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 879cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 880cb8e7090SChristoph Hellwig */ 88192872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 88252f75f4fSDavid Sterba const char *name, int namelen, 88372fd032eSSage Weil struct btrfs_root *snap_src, 8849babda9fSNikolay Borisov bool readonly, 8858696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 886cb8e7090SChristoph Hellwig { 8872b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 8880b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 889cb8e7090SChristoph Hellwig struct dentry *dentry; 890cb8e7090SChristoph Hellwig int error; 891cb8e7090SChristoph Hellwig 89200235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 89300235411SAl Viro if (error == -EINTR) 89400235411SAl Viro return error; 895cb8e7090SChristoph Hellwig 896cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 897cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 898cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 899cb8e7090SChristoph Hellwig goto out_unlock; 900cb8e7090SChristoph Hellwig 90176dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 902cb8e7090SChristoph Hellwig if (error) 903a874a63eSLiu Bo goto out_dput; 904cb8e7090SChristoph Hellwig 9059c52057cSChris Mason /* 9069c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9079c52057cSChris Mason * check for them now when we can safely fail 9089c52057cSChris Mason */ 9099c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 9109c52057cSChris Mason dir->i_ino, name, 9119c52057cSChris Mason namelen); 9129c52057cSChris Mason if (error) 9139c52057cSChris Mason goto out_dput; 9149c52057cSChris Mason 9150b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 91676dda93cSYan, Zheng 91776dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 91876dda93cSYan, Zheng goto out_up_read; 91976dda93cSYan, Zheng 9209babda9fSNikolay Borisov if (snap_src) 9219babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 9229babda9fSNikolay Borisov else 9239babda9fSNikolay Borisov error = create_subvol(dir, dentry, name, namelen, inherit); 9249babda9fSNikolay Borisov 92576dda93cSYan, Zheng if (!error) 92676dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 92776dda93cSYan, Zheng out_up_read: 9280b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 929cb8e7090SChristoph Hellwig out_dput: 930cb8e7090SChristoph Hellwig dput(dentry); 931cb8e7090SChristoph Hellwig out_unlock: 93264708539SJosef Bacik btrfs_inode_unlock(dir, 0); 933cb8e7090SChristoph Hellwig return error; 934cb8e7090SChristoph Hellwig } 935cb8e7090SChristoph Hellwig 936c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 937c11fbb6eSRobbie Ko const char *name, int namelen, 938c11fbb6eSRobbie Ko struct btrfs_root *root, 939c11fbb6eSRobbie Ko bool readonly, 940c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 941c11fbb6eSRobbie Ko { 942c11fbb6eSRobbie Ko int ret; 943c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 944c11fbb6eSRobbie Ko 945c11fbb6eSRobbie Ko /* 946c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 947c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 948c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 949c11fbb6eSRobbie Ko */ 950c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 951c11fbb6eSRobbie Ko 952f9baa501SFilipe Manana ret = btrfs_start_delalloc_snapshot(root, false); 953c11fbb6eSRobbie Ko if (ret) 954c11fbb6eSRobbie Ko goto out; 955c11fbb6eSRobbie Ko 956c11fbb6eSRobbie Ko /* 957c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 958c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 959c11fbb6eSRobbie Ko * creation. 960c11fbb6eSRobbie Ko */ 961c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 962c11fbb6eSRobbie Ko snapshot_force_cow = true; 963c11fbb6eSRobbie Ko 964c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 965c11fbb6eSRobbie Ko 966c11fbb6eSRobbie Ko ret = btrfs_mksubvol(parent, name, namelen, 967c11fbb6eSRobbie Ko root, readonly, inherit); 968c11fbb6eSRobbie Ko out: 969c11fbb6eSRobbie Ko if (snapshot_force_cow) 970c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 971c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 972c11fbb6eSRobbie Ko return ret; 973c11fbb6eSRobbie Ko } 974c11fbb6eSRobbie Ko 9754cb5300bSChris Mason /* 9764cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 9774cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 9784cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 9794cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 9804cb5300bSChris Mason * part of the file 9814cb5300bSChris Mason */ 982aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 9834cb5300bSChris Mason { 9844cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 9854cb5300bSChris Mason struct extent_map *em = NULL; 9864cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 9874cb5300bSChris Mason u64 end; 9884cb5300bSChris Mason 9894cb5300bSChris Mason read_lock(&em_tree->lock); 99009cbfeafSKirill A. Shutemov em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE); 9914cb5300bSChris Mason read_unlock(&em_tree->lock); 9924cb5300bSChris Mason 9934cb5300bSChris Mason if (em) { 9944cb5300bSChris Mason end = extent_map_end(em); 9954cb5300bSChris Mason free_extent_map(em); 9964cb5300bSChris Mason if (end - offset > thresh) 9974cb5300bSChris Mason return 0; 9984cb5300bSChris Mason } 9994cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 10004cb5300bSChris Mason thresh /= 2; 10014cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 10024cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 10034cb5300bSChris Mason if (end >= thresh) 10044cb5300bSChris Mason return 0; 10054cb5300bSChris Mason return 1; 10064cb5300bSChris Mason } 10074cb5300bSChris Mason 10084cb5300bSChris Mason /* 10094cb5300bSChris Mason * helper function to walk through a file and find extents 10104cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 10114cb5300bSChris Mason * 10124cb5300bSChris Mason * This is used by the defragging code to find new and small 10134cb5300bSChris Mason * extents 10144cb5300bSChris Mason */ 10154cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 10164cb5300bSChris Mason struct inode *inode, u64 newer_than, 1017aab110abSDavid Sterba u64 *off, u32 thresh) 10184cb5300bSChris Mason { 10194cb5300bSChris Mason struct btrfs_path *path; 10204cb5300bSChris Mason struct btrfs_key min_key; 10214cb5300bSChris Mason struct extent_buffer *leaf; 10224cb5300bSChris Mason struct btrfs_file_extent_item *extent; 10234cb5300bSChris Mason int type; 10244cb5300bSChris Mason int ret; 10254a0cc7caSNikolay Borisov u64 ino = btrfs_ino(BTRFS_I(inode)); 10264cb5300bSChris Mason 10274cb5300bSChris Mason path = btrfs_alloc_path(); 10284cb5300bSChris Mason if (!path) 10294cb5300bSChris Mason return -ENOMEM; 10304cb5300bSChris Mason 1031a4689d2bSDavid Sterba min_key.objectid = ino; 10324cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 10334cb5300bSChris Mason min_key.offset = *off; 10344cb5300bSChris Mason 10354cb5300bSChris Mason while (1) { 10366174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 10374cb5300bSChris Mason if (ret != 0) 10384cb5300bSChris Mason goto none; 1039f094c9bdSFilipe Manana process_slot: 1040a4689d2bSDavid Sterba if (min_key.objectid != ino) 10414cb5300bSChris Mason goto none; 10424cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 10434cb5300bSChris Mason goto none; 10444cb5300bSChris Mason 10454cb5300bSChris Mason leaf = path->nodes[0]; 10464cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 10474cb5300bSChris Mason struct btrfs_file_extent_item); 10484cb5300bSChris Mason 10494cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 10504cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 10514cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 10524cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 10534cb5300bSChris Mason *off = min_key.offset; 10544cb5300bSChris Mason btrfs_free_path(path); 10554cb5300bSChris Mason return 0; 10564cb5300bSChris Mason } 10574cb5300bSChris Mason 1058f094c9bdSFilipe Manana path->slots[0]++; 1059f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 1060f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 1061f094c9bdSFilipe Manana goto process_slot; 1062f094c9bdSFilipe Manana } 1063f094c9bdSFilipe Manana 10644cb5300bSChris Mason if (min_key.offset == (u64)-1) 10654cb5300bSChris Mason goto none; 10664cb5300bSChris Mason 10674cb5300bSChris Mason min_key.offset++; 10684cb5300bSChris Mason btrfs_release_path(path); 10694cb5300bSChris Mason } 10704cb5300bSChris Mason none: 10714cb5300bSChris Mason btrfs_free_path(path); 10724cb5300bSChris Mason return -ENOENT; 10734cb5300bSChris Mason } 10744cb5300bSChris Mason 10756c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 107617ce6ef8SLiu Bo { 107717ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1078940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 10796c282eb4SLi Zefan struct extent_map *em; 108009cbfeafSKirill A. Shutemov u64 len = PAGE_SIZE; 1081940100a4SChris Mason 1082940100a4SChris Mason /* 1083940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1084940100a4SChris Mason * the full extent lock 1085940100a4SChris Mason */ 1086940100a4SChris Mason read_lock(&em_tree->lock); 1087940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 1088940100a4SChris Mason read_unlock(&em_tree->lock); 1089940100a4SChris Mason 1090940100a4SChris Mason if (!em) { 1091308d9800SFilipe Manana struct extent_state *cached = NULL; 1092308d9800SFilipe Manana u64 end = start + len - 1; 1093308d9800SFilipe Manana 1094940100a4SChris Mason /* get the big lock and read metadata off disk */ 1095ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 109639b07b5dSOmar Sandoval em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len); 1097e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1098940100a4SChris Mason 10996cf8bfbfSDan Carpenter if (IS_ERR(em)) 11006c282eb4SLi Zefan return NULL; 1101940100a4SChris Mason } 1102940100a4SChris Mason 11036c282eb4SLi Zefan return em; 11046c282eb4SLi Zefan } 11056c282eb4SLi Zefan 11066c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 11076c282eb4SLi Zefan { 11086c282eb4SLi Zefan struct extent_map *next; 11096c282eb4SLi Zefan bool ret = true; 11106c282eb4SLi Zefan 11116c282eb4SLi Zefan /* this is the last extent */ 11126c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 11136c282eb4SLi Zefan return false; 11146c282eb4SLi Zefan 11156c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1116e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1117e9512d72SChris Mason ret = false; 1118e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1119ee22184bSByongho Lee (em->block_len > SZ_128K && next->block_len > SZ_128K)) 11206c282eb4SLi Zefan ret = false; 11216c282eb4SLi Zefan 11226c282eb4SLi Zefan free_extent_map(next); 11236c282eb4SLi Zefan return ret; 11246c282eb4SLi Zefan } 11256c282eb4SLi Zefan 1126aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1127a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1128a43a2111SAndrew Mahone int compress) 11296c282eb4SLi Zefan { 11306c282eb4SLi Zefan struct extent_map *em; 11316c282eb4SLi Zefan int ret = 1; 11326c282eb4SLi Zefan bool next_mergeable = true; 11334a3560c4SLiu Bo bool prev_mergeable = true; 11346c282eb4SLi Zefan 11356c282eb4SLi Zefan /* 11366c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 11376c282eb4SLi Zefan * defragging it 11386c282eb4SLi Zefan */ 11396c282eb4SLi Zefan if (start < *defrag_end) 11406c282eb4SLi Zefan return 1; 11416c282eb4SLi Zefan 11426c282eb4SLi Zefan *skip = 0; 11436c282eb4SLi Zefan 11446c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 11456c282eb4SLi Zefan if (!em) 11466c282eb4SLi Zefan return 0; 11476c282eb4SLi Zefan 1148940100a4SChris Mason /* this will cover holes, and inline extents */ 114917ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1150940100a4SChris Mason ret = 0; 115117ce6ef8SLiu Bo goto out; 115217ce6ef8SLiu Bo } 115317ce6ef8SLiu Bo 11544a3560c4SLiu Bo if (!*defrag_end) 11554a3560c4SLiu Bo prev_mergeable = false; 11564a3560c4SLiu Bo 11576c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1158940100a4SChris Mason /* 11596c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 11606c282eb4SLi Zefan * real extent, don't bother defragging it 1161940100a4SChris Mason */ 1162a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 11634a3560c4SLiu Bo (em->len >= thresh || (!next_mergeable && !prev_mergeable))) 1164940100a4SChris Mason ret = 0; 116517ce6ef8SLiu Bo out: 1166940100a4SChris Mason /* 1167940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1168940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1169940100a4SChris Mason * so that the next tiny extent will force a defrag. 1170940100a4SChris Mason * 1171940100a4SChris Mason * The end result of this is that tiny extents before a single big 1172940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1173940100a4SChris Mason */ 1174940100a4SChris Mason if (ret) { 1175940100a4SChris Mason *defrag_end = extent_map_end(em); 1176940100a4SChris Mason } else { 1177940100a4SChris Mason *last_len = 0; 1178940100a4SChris Mason *skip = extent_map_end(em); 1179940100a4SChris Mason *defrag_end = 0; 1180940100a4SChris Mason } 1181940100a4SChris Mason 1182940100a4SChris Mason free_extent_map(em); 1183940100a4SChris Mason return ret; 1184940100a4SChris Mason } 1185940100a4SChris Mason 11864cb5300bSChris Mason /* 11874cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 11884cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 11894cb5300bSChris Mason * to COW and defrag. 11904cb5300bSChris Mason * 11914cb5300bSChris Mason * It also makes sure the delalloc code has enough 11924cb5300bSChris Mason * dirty data to avoid making new small extents as part 11934cb5300bSChris Mason * of the defrag 11944cb5300bSChris Mason * 11954cb5300bSChris Mason * It's a good idea to start RA on this range 11964cb5300bSChris Mason * before calling this. 11974cb5300bSChris Mason */ 11984cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 11994cb5300bSChris Mason struct page **pages, 12004cb5300bSChris Mason unsigned long start_index, 1201c41570c9SJustin Maggard unsigned long num_pages) 1202f46b5a66SChristoph Hellwig { 12034cb5300bSChris Mason unsigned long file_end; 12044cb5300bSChris Mason u64 isize = i_size_read(inode); 1205f46b5a66SChristoph Hellwig u64 page_start; 1206f46b5a66SChristoph Hellwig u64 page_end; 12071f12bd06SLiu Bo u64 page_cnt; 1208a1fbc675SMatthew Wilcox (Oracle) u64 start = (u64)start_index << PAGE_SHIFT; 12097f458a38SFilipe Manana u64 search_start; 12104cb5300bSChris Mason int ret; 12114cb5300bSChris Mason int i; 12124cb5300bSChris Mason int i_done; 12134cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 12144cb5300bSChris Mason struct extent_state *cached_state = NULL; 1215600a45e1SMiao Xie struct extent_io_tree *tree; 1216364ecf36SQu Wenruo struct extent_changeset *data_reserved = NULL; 12173b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 12184cb5300bSChris Mason 121909cbfeafSKirill A. Shutemov file_end = (isize - 1) >> PAGE_SHIFT; 12201f12bd06SLiu Bo if (!isize || start_index > file_end) 12211f12bd06SLiu Bo return 0; 12221f12bd06SLiu Bo 12231f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 12244cb5300bSChris Mason 1225e5b7231eSNikolay Borisov ret = btrfs_delalloc_reserve_space(BTRFS_I(inode), &data_reserved, 1226a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT); 12274cb5300bSChris Mason if (ret) 12284cb5300bSChris Mason return ret; 12294cb5300bSChris Mason i_done = 0; 1230600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 12314cb5300bSChris Mason 12324cb5300bSChris Mason /* step one, lock all the pages */ 12331f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 12344cb5300bSChris Mason struct page *page; 1235600a45e1SMiao Xie again: 1236a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 12373b16a4e3SJosef Bacik start_index + i, mask); 12384cb5300bSChris Mason if (!page) 12394cb5300bSChris Mason break; 12404cb5300bSChris Mason 124132443de3SQu Wenruo ret = set_page_extent_mapped(page); 124232443de3SQu Wenruo if (ret < 0) { 124332443de3SQu Wenruo unlock_page(page); 124432443de3SQu Wenruo put_page(page); 124532443de3SQu Wenruo break; 124632443de3SQu Wenruo } 124732443de3SQu Wenruo 1248600a45e1SMiao Xie page_start = page_offset(page); 124909cbfeafSKirill A. Shutemov page_end = page_start + PAGE_SIZE - 1; 1250600a45e1SMiao Xie while (1) { 1251308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1252ff13db41SDavid Sterba &cached_state); 1253c3504372SNikolay Borisov ordered = btrfs_lookup_ordered_extent(BTRFS_I(inode), 1254600a45e1SMiao Xie page_start); 1255308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1256e43bbe5eSDavid Sterba &cached_state); 1257600a45e1SMiao Xie if (!ordered) 1258600a45e1SMiao Xie break; 1259600a45e1SMiao Xie 1260600a45e1SMiao Xie unlock_page(page); 1261c0a43603SNikolay Borisov btrfs_start_ordered_extent(ordered, 1); 1262600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1263600a45e1SMiao Xie lock_page(page); 12641f12bd06SLiu Bo /* 12651f12bd06SLiu Bo * we unlocked the page above, so we need check if 12661f12bd06SLiu Bo * it was released or not. 12671f12bd06SLiu Bo */ 12681f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 12691f12bd06SLiu Bo unlock_page(page); 127009cbfeafSKirill A. Shutemov put_page(page); 12711f12bd06SLiu Bo goto again; 12721f12bd06SLiu Bo } 1273600a45e1SMiao Xie } 1274600a45e1SMiao Xie 12754cb5300bSChris Mason if (!PageUptodate(page)) { 12764cb5300bSChris Mason btrfs_readpage(NULL, page); 12774cb5300bSChris Mason lock_page(page); 12784cb5300bSChris Mason if (!PageUptodate(page)) { 12794cb5300bSChris Mason unlock_page(page); 128009cbfeafSKirill A. Shutemov put_page(page); 12814cb5300bSChris Mason ret = -EIO; 12824cb5300bSChris Mason break; 12834cb5300bSChris Mason } 12844cb5300bSChris Mason } 1285600a45e1SMiao Xie 1286600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1287600a45e1SMiao Xie unlock_page(page); 128809cbfeafSKirill A. Shutemov put_page(page); 1289600a45e1SMiao Xie goto again; 1290600a45e1SMiao Xie } 1291600a45e1SMiao Xie 12924cb5300bSChris Mason pages[i] = page; 12934cb5300bSChris Mason i_done++; 12944cb5300bSChris Mason } 12954cb5300bSChris Mason if (!i_done || ret) 12964cb5300bSChris Mason goto out; 12974cb5300bSChris Mason 12981751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 12994cb5300bSChris Mason goto out; 13004cb5300bSChris Mason 13014cb5300bSChris Mason /* 13024cb5300bSChris Mason * so now we have a nice long stream of locked 13034cb5300bSChris Mason * and up to date pages, lets wait on them 13044cb5300bSChris Mason */ 13054cb5300bSChris Mason for (i = 0; i < i_done; i++) 13064cb5300bSChris Mason wait_on_page_writeback(pages[i]); 13074cb5300bSChris Mason 13084cb5300bSChris Mason page_start = page_offset(pages[0]); 130909cbfeafSKirill A. Shutemov page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE; 13104cb5300bSChris Mason 13114cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1312ff13db41SDavid Sterba page_start, page_end - 1, &cached_state); 13137f458a38SFilipe Manana 13147f458a38SFilipe Manana /* 13157f458a38SFilipe Manana * When defragmenting we skip ranges that have holes or inline extents, 13167f458a38SFilipe Manana * (check should_defrag_range()), to avoid unnecessary IO and wasting 13177f458a38SFilipe Manana * space. At btrfs_defrag_file(), we check if a range should be defragged 13187f458a38SFilipe Manana * before locking the inode and then, if it should, we trigger a sync 13197f458a38SFilipe Manana * page cache readahead - we lock the inode only after that to avoid 13207f458a38SFilipe Manana * blocking for too long other tasks that possibly want to operate on 13217f458a38SFilipe Manana * other file ranges. But before we were able to get the inode lock, 13227f458a38SFilipe Manana * some other task may have punched a hole in the range, or we may have 13237f458a38SFilipe Manana * now an inline extent, in which case we should not defrag. So check 13247f458a38SFilipe Manana * for that here, where we have the inode and the range locked, and bail 13257f458a38SFilipe Manana * out if that happened. 13267f458a38SFilipe Manana */ 13277f458a38SFilipe Manana search_start = page_start; 13287f458a38SFilipe Manana while (search_start < page_end) { 13297f458a38SFilipe Manana struct extent_map *em; 13307f458a38SFilipe Manana 13317f458a38SFilipe Manana em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, search_start, 13327f458a38SFilipe Manana page_end - search_start); 13337f458a38SFilipe Manana if (IS_ERR(em)) { 13347f458a38SFilipe Manana ret = PTR_ERR(em); 13357f458a38SFilipe Manana goto out_unlock_range; 13367f458a38SFilipe Manana } 13377f458a38SFilipe Manana if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 13387f458a38SFilipe Manana free_extent_map(em); 13397f458a38SFilipe Manana /* Ok, 0 means we did not defrag anything */ 13407f458a38SFilipe Manana ret = 0; 13417f458a38SFilipe Manana goto out_unlock_range; 13427f458a38SFilipe Manana } 13437f458a38SFilipe Manana search_start = extent_map_end(em); 13447f458a38SFilipe Manana free_extent_map(em); 13457f458a38SFilipe Manana } 13467f458a38SFilipe Manana 13474cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 1348e182163dSOmar Sandoval page_end - 1, EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 1349e182163dSOmar Sandoval EXTENT_DEFRAG, 0, 0, &cached_state); 13504cb5300bSChris Mason 13511f12bd06SLiu Bo if (i_done != page_cnt) { 13529e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 135328c4a3e2SSu Yue btrfs_mod_outstanding_extents(BTRFS_I(inode), 1); 13549e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 135586d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1356a1fbc675SMatthew Wilcox (Oracle) start, (page_cnt - i_done) << PAGE_SHIFT, true); 13574cb5300bSChris Mason } 13584cb5300bSChris Mason 13594cb5300bSChris Mason 13609e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 1361018ed4f7SDavid Sterba &cached_state); 13624cb5300bSChris Mason 13634cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 1364e43bbe5eSDavid Sterba page_start, page_end - 1, &cached_state); 13654cb5300bSChris Mason 13664cb5300bSChris Mason for (i = 0; i < i_done; i++) { 13674cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 13684cb5300bSChris Mason ClearPageChecked(pages[i]); 13694cb5300bSChris Mason set_page_dirty(pages[i]); 13704cb5300bSChris Mason unlock_page(pages[i]); 137109cbfeafSKirill A. Shutemov put_page(pages[i]); 13724cb5300bSChris Mason } 13738702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1374364ecf36SQu Wenruo extent_changeset_free(data_reserved); 13754cb5300bSChris Mason return i_done; 13767f458a38SFilipe Manana 13777f458a38SFilipe Manana out_unlock_range: 13787f458a38SFilipe Manana unlock_extent_cached(&BTRFS_I(inode)->io_tree, 13797f458a38SFilipe Manana page_start, page_end - 1, &cached_state); 13804cb5300bSChris Mason out: 13814cb5300bSChris Mason for (i = 0; i < i_done; i++) { 13824cb5300bSChris Mason unlock_page(pages[i]); 138309cbfeafSKirill A. Shutemov put_page(pages[i]); 13844cb5300bSChris Mason } 138586d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1386a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT, true); 13878702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1388364ecf36SQu Wenruo extent_changeset_free(data_reserved); 13894cb5300bSChris Mason return ret; 13904cb5300bSChris Mason 13914cb5300bSChris Mason } 13924cb5300bSChris Mason 13934cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 13944cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 13954cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 13964cb5300bSChris Mason { 13970b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 13984cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 13994cb5300bSChris Mason struct file_ra_state *ra = NULL; 14004cb5300bSChris Mason unsigned long last_index; 1401151a31b2SLi Zefan u64 isize = i_size_read(inode); 1402940100a4SChris Mason u64 last_len = 0; 1403940100a4SChris Mason u64 skip = 0; 1404940100a4SChris Mason u64 defrag_end = 0; 14054cb5300bSChris Mason u64 newer_off = range->start; 1406f46b5a66SChristoph Hellwig unsigned long i; 1407008873eaSLi Zefan unsigned long ra_index = 0; 1408f46b5a66SChristoph Hellwig int ret; 14094cb5300bSChris Mason int defrag_count = 0; 14101a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1411aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 141209cbfeafSKirill A. Shutemov unsigned long max_cluster = SZ_256K >> PAGE_SHIFT; 1413c41570c9SJustin Maggard unsigned long cluster = max_cluster; 1414ee22184bSByongho Lee u64 new_align = ~((u64)SZ_128K - 1); 14154cb5300bSChris Mason struct page **pages = NULL; 14161e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 14174cb5300bSChris Mason 14180abd5b17SLiu Bo if (isize == 0) 14190abd5b17SLiu Bo return 0; 14200abd5b17SLiu Bo 14210abd5b17SLiu Bo if (range->start >= isize) 14220abd5b17SLiu Bo return -EINVAL; 14231a419d85SLi Zefan 14241e2ef46dSDavid Sterba if (do_compress) { 1425ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 14261a419d85SLi Zefan return -EINVAL; 14271a419d85SLi Zefan if (range->compress_type) 14281a419d85SLi Zefan compress_type = range->compress_type; 14291a419d85SLi Zefan } 1430f46b5a66SChristoph Hellwig 14310abd5b17SLiu Bo if (extent_thresh == 0) 1432ee22184bSByongho Lee extent_thresh = SZ_256K; 1433f46b5a66SChristoph Hellwig 14344cb5300bSChris Mason /* 14350a52d108SDavid Sterba * If we were not given a file, allocate a readahead context. As 14360a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 14370a52d108SDavid Sterba * we don't error out. 14384cb5300bSChris Mason */ 14394cb5300bSChris Mason if (!file) { 144063e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 14410a52d108SDavid Sterba if (ra) 14424cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 14434cb5300bSChris Mason } else { 14444cb5300bSChris Mason ra = &file->f_ra; 14454cb5300bSChris Mason } 14464cb5300bSChris Mason 144763e727ecSDavid Sterba pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL); 14484cb5300bSChris Mason if (!pages) { 14494cb5300bSChris Mason ret = -ENOMEM; 14504cb5300bSChris Mason goto out_ra; 14514cb5300bSChris Mason } 14524cb5300bSChris Mason 14534cb5300bSChris Mason /* find the last page to defrag */ 14541e701a32SChris Mason if (range->start + range->len > range->start) { 1455151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 145609cbfeafSKirill A. Shutemov range->start + range->len - 1) >> PAGE_SHIFT; 14571e701a32SChris Mason } else { 145809cbfeafSKirill A. Shutemov last_index = (isize - 1) >> PAGE_SHIFT; 14591e701a32SChris Mason } 14601e701a32SChris Mason 14614cb5300bSChris Mason if (newer_than) { 14624cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 1463ee22184bSByongho Lee &newer_off, SZ_64K); 14644cb5300bSChris Mason if (!ret) { 14654cb5300bSChris Mason range->start = newer_off; 14664cb5300bSChris Mason /* 14674cb5300bSChris Mason * we always align our defrag to help keep 14684cb5300bSChris Mason * the extents in the file evenly spaced 14694cb5300bSChris Mason */ 147009cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 14714cb5300bSChris Mason } else 14724cb5300bSChris Mason goto out_ra; 14734cb5300bSChris Mason } else { 147409cbfeafSKirill A. Shutemov i = range->start >> PAGE_SHIFT; 14754cb5300bSChris Mason } 14764cb5300bSChris Mason if (!max_to_defrag) 1477070034bdSchandan max_to_defrag = last_index - i + 1; 14784cb5300bSChris Mason 14792a0f7f57SLi Zefan /* 14802a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 14812a0f7f57SLi Zefan * written sequentially. 14822a0f7f57SLi Zefan */ 14832a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 14842a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 14852a0f7f57SLi Zefan 1486f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 148709cbfeafSKirill A. Shutemov (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) { 14884cb5300bSChris Mason /* 14894cb5300bSChris Mason * make sure we stop running if someone unmounts 14904cb5300bSChris Mason * the FS 14914cb5300bSChris Mason */ 14921751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 14934cb5300bSChris Mason break; 14944cb5300bSChris Mason 14950b246afaSJeff Mahoney if (btrfs_defrag_cancelled(fs_info)) { 14960b246afaSJeff Mahoney btrfs_debug(fs_info, "defrag_file cancelled"); 1497210549ebSDavid Sterba ret = -EAGAIN; 149850535db8STian Tao goto error; 1499210549ebSDavid Sterba } 1500210549ebSDavid Sterba 150109cbfeafSKirill A. Shutemov if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT, 15026c282eb4SLi Zefan extent_thresh, &last_len, &skip, 15031e2ef46dSDavid Sterba &defrag_end, do_compress)){ 1504940100a4SChris Mason unsigned long next; 1505940100a4SChris Mason /* 1506940100a4SChris Mason * the should_defrag function tells us how much to skip 1507940100a4SChris Mason * bump our counter by the suggested amount 1508940100a4SChris Mason */ 150909cbfeafSKirill A. Shutemov next = DIV_ROUND_UP(skip, PAGE_SIZE); 1510940100a4SChris Mason i = max(i + 1, next); 1511940100a4SChris Mason continue; 1512940100a4SChris Mason } 1513008873eaSLi Zefan 1514008873eaSLi Zefan if (!newer_than) { 151509cbfeafSKirill A. Shutemov cluster = (PAGE_ALIGN(defrag_end) >> 151609cbfeafSKirill A. Shutemov PAGE_SHIFT) - i; 1517008873eaSLi Zefan cluster = min(cluster, max_cluster); 1518008873eaSLi Zefan } else { 1519008873eaSLi Zefan cluster = max_cluster; 1520008873eaSLi Zefan } 1521008873eaSLi Zefan 1522008873eaSLi Zefan if (i + cluster > ra_index) { 1523008873eaSLi Zefan ra_index = max(i, ra_index); 15240a52d108SDavid Sterba if (ra) 1525d3c0bab5SDavid Sterba page_cache_sync_readahead(inode->i_mapping, ra, 1526d3c0bab5SDavid Sterba file, ra_index, cluster); 1527e4826a5bSchandan ra_index += cluster; 1528008873eaSLi Zefan } 15294cb5300bSChris Mason 153064708539SJosef Bacik btrfs_inode_lock(inode, 0); 1531eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1532eede2bf3SOmar Sandoval ret = -ETXTBSY; 1533eede2bf3SOmar Sandoval } else { 15341e2ef46dSDavid Sterba if (do_compress) 1535eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 1536008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1537eede2bf3SOmar Sandoval } 1538ecb8bea8SLiu Bo if (ret < 0) { 153964708539SJosef Bacik btrfs_inode_unlock(inode, 0); 15404cb5300bSChris Mason goto out_ra; 1541ecb8bea8SLiu Bo } 15424cb5300bSChris Mason 15434cb5300bSChris Mason defrag_count += ret; 1544d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 154564708539SJosef Bacik btrfs_inode_unlock(inode, 0); 15464cb5300bSChris Mason 15474cb5300bSChris Mason if (newer_than) { 15484cb5300bSChris Mason if (newer_off == (u64)-1) 15494cb5300bSChris Mason break; 15504cb5300bSChris Mason 1551e1f041e1SLiu Bo if (ret > 0) 1552e1f041e1SLiu Bo i += ret; 1553e1f041e1SLiu Bo 15544cb5300bSChris Mason newer_off = max(newer_off + 1, 155509cbfeafSKirill A. Shutemov (u64)i << PAGE_SHIFT); 15564cb5300bSChris Mason 1557ee22184bSByongho Lee ret = find_new_extents(root, inode, newer_than, 1558ee22184bSByongho Lee &newer_off, SZ_64K); 15594cb5300bSChris Mason if (!ret) { 15604cb5300bSChris Mason range->start = newer_off; 156109cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 15624cb5300bSChris Mason } else { 15634cb5300bSChris Mason break; 1564940100a4SChris Mason } 15654cb5300bSChris Mason } else { 1566008873eaSLi Zefan if (ret > 0) { 1567cbcc8326SLi Zefan i += ret; 156809cbfeafSKirill A. Shutemov last_len += ret << PAGE_SHIFT; 1569008873eaSLi Zefan } else { 1570940100a4SChris Mason i++; 1571008873eaSLi Zefan last_len = 0; 1572008873eaSLi Zefan } 1573f46b5a66SChristoph Hellwig } 15744cb5300bSChris Mason } 1575f46b5a66SChristoph Hellwig 157650535db8STian Tao ret = defrag_count; 157750535db8STian Tao error: 1578dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 15791e701a32SChris Mason filemap_flush(inode->i_mapping); 1580dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1581dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1582dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1583dec8ef90SFilipe Manana } 15841e701a32SChris Mason 15851a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 15860b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 15875c1aab1dSNick Terrell } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) { 15885c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 15891a419d85SLi Zefan } 15901a419d85SLi Zefan 15914cb5300bSChris Mason out_ra: 15921e2ef46dSDavid Sterba if (do_compress) { 159364708539SJosef Bacik btrfs_inode_lock(inode, 0); 1594eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 159564708539SJosef Bacik btrfs_inode_unlock(inode, 0); 1596633085c7SFilipe David Borba Manana } 15974cb5300bSChris Mason if (!file) 15984cb5300bSChris Mason kfree(ra); 15994cb5300bSChris Mason kfree(pages); 1600940100a4SChris Mason return ret; 1601f46b5a66SChristoph Hellwig } 1602f46b5a66SChristoph Hellwig 160317aaa434SDavid Sterba /* 160417aaa434SDavid Sterba * Try to start exclusive operation @type or cancel it if it's running. 160517aaa434SDavid Sterba * 160617aaa434SDavid Sterba * Return: 160717aaa434SDavid Sterba * 0 - normal mode, newly claimed op started 160817aaa434SDavid Sterba * >0 - normal mode, something else is running, 160917aaa434SDavid Sterba * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space 161017aaa434SDavid Sterba * ECANCELED - cancel mode, successful cancel 161117aaa434SDavid Sterba * ENOTCONN - cancel mode, operation not running anymore 161217aaa434SDavid Sterba */ 161317aaa434SDavid Sterba static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info, 161417aaa434SDavid Sterba enum btrfs_exclusive_operation type, bool cancel) 161517aaa434SDavid Sterba { 161617aaa434SDavid Sterba if (!cancel) { 161717aaa434SDavid Sterba /* Start normal op */ 161817aaa434SDavid Sterba if (!btrfs_exclop_start(fs_info, type)) 161917aaa434SDavid Sterba return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 162017aaa434SDavid Sterba /* Exclusive operation is now claimed */ 162117aaa434SDavid Sterba return 0; 162217aaa434SDavid Sterba } 162317aaa434SDavid Sterba 162417aaa434SDavid Sterba /* Cancel running op */ 162517aaa434SDavid Sterba if (btrfs_exclop_start_try_lock(fs_info, type)) { 162617aaa434SDavid Sterba /* 162717aaa434SDavid Sterba * This blocks any exclop finish from setting it to NONE, so we 162817aaa434SDavid Sterba * request cancellation. Either it runs and we will wait for it, 162917aaa434SDavid Sterba * or it has finished and no waiting will happen. 163017aaa434SDavid Sterba */ 163117aaa434SDavid Sterba atomic_inc(&fs_info->reloc_cancel_req); 163217aaa434SDavid Sterba btrfs_exclop_start_unlock(fs_info); 163317aaa434SDavid Sterba 163417aaa434SDavid Sterba if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags)) 163517aaa434SDavid Sterba wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING, 163617aaa434SDavid Sterba TASK_INTERRUPTIBLE); 163717aaa434SDavid Sterba 163817aaa434SDavid Sterba return -ECANCELED; 163917aaa434SDavid Sterba } 164017aaa434SDavid Sterba 164117aaa434SDavid Sterba /* Something else is running or none */ 164217aaa434SDavid Sterba return -ENOTCONN; 164317aaa434SDavid Sterba } 164417aaa434SDavid Sterba 1645198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 164676dda93cSYan, Zheng void __user *arg) 1647f46b5a66SChristoph Hellwig { 16480b246afaSJeff Mahoney struct inode *inode = file_inode(file); 16490b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1650f46b5a66SChristoph Hellwig u64 new_size; 1651f46b5a66SChristoph Hellwig u64 old_size; 1652f46b5a66SChristoph Hellwig u64 devid = 1; 16530b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1654f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1655f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1656f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1657f46b5a66SChristoph Hellwig char *sizestr; 16589a40f122SGui Hecheng char *retptr; 1659f46b5a66SChristoph Hellwig char *devstr = NULL; 1660f46b5a66SChristoph Hellwig int ret = 0; 1661f46b5a66SChristoph Hellwig int mod = 0; 1662bb059a37SDavid Sterba bool cancel; 1663f46b5a66SChristoph Hellwig 1664e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1665e441d54dSChris Mason return -EPERM; 1666e441d54dSChris Mason 1667198605a8SMiao Xie ret = mnt_want_write_file(file); 1668198605a8SMiao Xie if (ret) 1669198605a8SMiao Xie return ret; 1670198605a8SMiao Xie 1671bb059a37SDavid Sterba /* 1672bb059a37SDavid Sterba * Read the arguments before checking exclusivity to be able to 1673bb059a37SDavid Sterba * distinguish regular resize and cancel 1674bb059a37SDavid Sterba */ 1675dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1676c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1677c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1678bb059a37SDavid Sterba goto out_drop; 1679c9e9f97bSIlya Dryomov } 16805516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1681f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1682bb059a37SDavid Sterba cancel = (strcmp("cancel", sizestr) == 0); 1683bb059a37SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel); 1684bb059a37SDavid Sterba if (ret) 1685bb059a37SDavid Sterba goto out_free; 1686bb059a37SDavid Sterba /* Exclusive operation is now claimed */ 1687bb059a37SDavid Sterba 1688f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1689f46b5a66SChristoph Hellwig if (devstr) { 1690f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1691f46b5a66SChristoph Hellwig *devstr = '\0'; 1692f46b5a66SChristoph Hellwig devstr = vol_args->name; 169358dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 169458dfae63SZhangZhen if (ret) 1695bb059a37SDavid Sterba goto out_finish; 1696dfd79829SMiao Xie if (!devid) { 1697dfd79829SMiao Xie ret = -EINVAL; 1698bb059a37SDavid Sterba goto out_finish; 1699dfd79829SMiao Xie } 17000b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1701f46b5a66SChristoph Hellwig } 1702dba60f3fSMiao Xie 1703b2598edfSAnand Jain device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL); 1704f46b5a66SChristoph Hellwig if (!device) { 17050b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1706c1c9ff7cSGeert Uytterhoeven devid); 1707dfd79829SMiao Xie ret = -ENODEV; 1708bb059a37SDavid Sterba goto out_finish; 1709f46b5a66SChristoph Hellwig } 1710dba60f3fSMiao Xie 1711ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 17120b246afaSJeff Mahoney btrfs_info(fs_info, 1713efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1714c1c9ff7cSGeert Uytterhoeven devid); 1715dfd79829SMiao Xie ret = -EPERM; 1716bb059a37SDavid Sterba goto out_finish; 17174e42ae1bSLiu Bo } 17184e42ae1bSLiu Bo 1719f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1720f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1721f46b5a66SChristoph Hellwig else { 1722f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1723f46b5a66SChristoph Hellwig mod = -1; 1724f46b5a66SChristoph Hellwig sizestr++; 1725f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1726f46b5a66SChristoph Hellwig mod = 1; 1727f46b5a66SChristoph Hellwig sizestr++; 1728f46b5a66SChristoph Hellwig } 17299a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 17309a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1731f46b5a66SChristoph Hellwig ret = -EINVAL; 1732bb059a37SDavid Sterba goto out_finish; 1733f46b5a66SChristoph Hellwig } 1734f46b5a66SChristoph Hellwig } 1735f46b5a66SChristoph Hellwig 1736401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1737dfd79829SMiao Xie ret = -EPERM; 1738bb059a37SDavid Sterba goto out_finish; 173963a212abSStefan Behrens } 174063a212abSStefan Behrens 17417cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1742f46b5a66SChristoph Hellwig 1743f46b5a66SChristoph Hellwig if (mod < 0) { 1744f46b5a66SChristoph Hellwig if (new_size > old_size) { 1745f46b5a66SChristoph Hellwig ret = -EINVAL; 1746bb059a37SDavid Sterba goto out_finish; 1747f46b5a66SChristoph Hellwig } 1748f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1749f46b5a66SChristoph Hellwig } else if (mod > 0) { 1750eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1751902c68a4SGui Hecheng ret = -ERANGE; 1752bb059a37SDavid Sterba goto out_finish; 1753eb8052e0SWenliang Fan } 1754f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1755f46b5a66SChristoph Hellwig } 1756f46b5a66SChristoph Hellwig 1757ee22184bSByongho Lee if (new_size < SZ_256M) { 1758f46b5a66SChristoph Hellwig ret = -EINVAL; 1759bb059a37SDavid Sterba goto out_finish; 1760f46b5a66SChristoph Hellwig } 1761f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1762f46b5a66SChristoph Hellwig ret = -EFBIG; 1763bb059a37SDavid Sterba goto out_finish; 1764f46b5a66SChristoph Hellwig } 1765f46b5a66SChristoph Hellwig 176647f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1767f46b5a66SChristoph Hellwig 1768f46b5a66SChristoph Hellwig if (new_size > old_size) { 1769a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 177098d5dc13STsutomu Itoh if (IS_ERR(trans)) { 177198d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1772bb059a37SDavid Sterba goto out_finish; 177398d5dc13STsutomu Itoh } 1774f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 17753a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1776ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1777f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 17780253f40eSjeff.liu } /* equal, nothing need to do */ 1779f46b5a66SChristoph Hellwig 1780faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1781faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1782faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1783faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 1784faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1785bb059a37SDavid Sterba out_finish: 1786bb059a37SDavid Sterba btrfs_exclop_finish(fs_info); 1787c9e9f97bSIlya Dryomov out_free: 1788f46b5a66SChristoph Hellwig kfree(vol_args); 1789bb059a37SDavid Sterba out_drop: 179018f39c41SIlya Dryomov mnt_drop_write_file(file); 1791f46b5a66SChristoph Hellwig return ret; 1792f46b5a66SChristoph Hellwig } 1793f46b5a66SChristoph Hellwig 17945d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 179552f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 17965d54c67eSNikolay Borisov bool readonly, 17978696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1798f46b5a66SChristoph Hellwig { 1799f46b5a66SChristoph Hellwig int namelen; 18003de4586cSChris Mason int ret = 0; 1801f46b5a66SChristoph Hellwig 1802325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1803325c50e3SJeff Mahoney return -ENOTDIR; 1804325c50e3SJeff Mahoney 1805a874a63eSLiu Bo ret = mnt_want_write_file(file); 1806a874a63eSLiu Bo if (ret) 1807a874a63eSLiu Bo goto out; 1808a874a63eSLiu Bo 180972fd032eSSage Weil namelen = strlen(name); 181072fd032eSSage Weil if (strchr(name, '/')) { 1811f46b5a66SChristoph Hellwig ret = -EINVAL; 1812a874a63eSLiu Bo goto out_drop_write; 1813f46b5a66SChristoph Hellwig } 1814f46b5a66SChristoph Hellwig 181516780cabSChris Mason if (name[0] == '.' && 181616780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 181716780cabSChris Mason ret = -EEXIST; 1818a874a63eSLiu Bo goto out_drop_write; 181916780cabSChris Mason } 182016780cabSChris Mason 18213de4586cSChris Mason if (subvol) { 182272fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 18235d54c67eSNikolay Borisov NULL, readonly, inherit); 1824cb8e7090SChristoph Hellwig } else { 18252903ff01SAl Viro struct fd src = fdget(fd); 18263de4586cSChris Mason struct inode *src_inode; 18272903ff01SAl Viro if (!src.file) { 18283de4586cSChris Mason ret = -EINVAL; 1829a874a63eSLiu Bo goto out_drop_write; 18303de4586cSChris Mason } 18313de4586cSChris Mason 1832496ad9aaSAl Viro src_inode = file_inode(src.file); 1833496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1834c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1835efe120a0SFrank Holton "Snapshot src from another FS"); 183623ad5b17SKusanagi Kouichi ret = -EXDEV; 183721cb47beSChristian Brauner } else if (!inode_owner_or_capable(&init_user_ns, src_inode)) { 1838d0242061SDavid Sterba /* 1839d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1840d0242061SDavid Sterba * are limited to own subvolumes only 1841d0242061SDavid Sterba */ 1842d0242061SDavid Sterba ret = -EPERM; 1843ecd18815SAl Viro } else { 1844c11fbb6eSRobbie Ko ret = btrfs_mksnapshot(&file->f_path, name, namelen, 184572fd032eSSage Weil BTRFS_I(src_inode)->root, 18465d54c67eSNikolay Borisov readonly, inherit); 1847ecd18815SAl Viro } 18482903ff01SAl Viro fdput(src); 1849cb8e7090SChristoph Hellwig } 1850a874a63eSLiu Bo out_drop_write: 1851a874a63eSLiu Bo mnt_drop_write_file(file); 1852f46b5a66SChristoph Hellwig out: 185372fd032eSSage Weil return ret; 185472fd032eSSage Weil } 185572fd032eSSage Weil 185672fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1857fa0d2b9bSLi Zefan void __user *arg, int subvol) 185872fd032eSSage Weil { 1859fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 186072fd032eSSage Weil int ret; 186172fd032eSSage Weil 1862325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1863325c50e3SJeff Mahoney return -ENOTDIR; 1864325c50e3SJeff Mahoney 1865fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1866fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1867fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1868fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1869fa0d2b9bSLi Zefan 18705d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 18715d54c67eSNikolay Borisov subvol, false, NULL); 1872fa0d2b9bSLi Zefan 1873fa0d2b9bSLi Zefan kfree(vol_args); 1874fa0d2b9bSLi Zefan return ret; 1875fa0d2b9bSLi Zefan } 1876fa0d2b9bSLi Zefan 1877fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1878fa0d2b9bSLi Zefan void __user *arg, int subvol) 1879fa0d2b9bSLi Zefan { 1880fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1881fa0d2b9bSLi Zefan int ret; 1882b83cc969SLi Zefan bool readonly = false; 18836f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 188472fd032eSSage Weil 1885325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1886325c50e3SJeff Mahoney return -ENOTDIR; 1887325c50e3SJeff Mahoney 1888fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1889fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1890fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1891fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1892fdfb1e4fSLi Zefan 1893673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 1894b83cc969SLi Zefan ret = -EOPNOTSUPP; 1895c47ca32dSDan Carpenter goto free_args; 1896fdfb1e4fSLi Zefan } 1897fdfb1e4fSLi Zefan 1898b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1899b83cc969SLi Zefan readonly = true; 19006f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 19015011c5a6SDan Carpenter u64 nums; 19025011c5a6SDan Carpenter 19035011c5a6SDan Carpenter if (vol_args->size < sizeof(*inherit) || 19045011c5a6SDan Carpenter vol_args->size > PAGE_SIZE) { 19056f72c7e2SArne Jansen ret = -EINVAL; 1906c47ca32dSDan Carpenter goto free_args; 19076f72c7e2SArne Jansen } 19086f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 19096f72c7e2SArne Jansen if (IS_ERR(inherit)) { 19106f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1911c47ca32dSDan Carpenter goto free_args; 19126f72c7e2SArne Jansen } 19135011c5a6SDan Carpenter 19145011c5a6SDan Carpenter if (inherit->num_qgroups > PAGE_SIZE || 19155011c5a6SDan Carpenter inherit->num_ref_copies > PAGE_SIZE || 19165011c5a6SDan Carpenter inherit->num_excl_copies > PAGE_SIZE) { 19175011c5a6SDan Carpenter ret = -EINVAL; 19185011c5a6SDan Carpenter goto free_inherit; 19195011c5a6SDan Carpenter } 19205011c5a6SDan Carpenter 19215011c5a6SDan Carpenter nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + 19225011c5a6SDan Carpenter 2 * inherit->num_excl_copies; 19235011c5a6SDan Carpenter if (vol_args->size != struct_size(inherit, qgroups, nums)) { 19245011c5a6SDan Carpenter ret = -EINVAL; 19255011c5a6SDan Carpenter goto free_inherit; 19265011c5a6SDan Carpenter } 19276f72c7e2SArne Jansen } 192875eaa0e2SSage Weil 19295d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 19305d54c67eSNikolay Borisov subvol, readonly, inherit); 1931c47ca32dSDan Carpenter if (ret) 1932c47ca32dSDan Carpenter goto free_inherit; 1933c47ca32dSDan Carpenter free_inherit: 19346f72c7e2SArne Jansen kfree(inherit); 1935c47ca32dSDan Carpenter free_args: 1936c47ca32dSDan Carpenter kfree(vol_args); 1937f46b5a66SChristoph Hellwig return ret; 1938f46b5a66SChristoph Hellwig } 1939f46b5a66SChristoph Hellwig 19400caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 19410caa102dSLi Zefan void __user *arg) 19420caa102dSLi Zefan { 1943496ad9aaSAl Viro struct inode *inode = file_inode(file); 19440b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 19450caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 19460caa102dSLi Zefan int ret = 0; 19470caa102dSLi Zefan u64 flags = 0; 19480caa102dSLi Zefan 19494a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 19500caa102dSLi Zefan return -EINVAL; 19510caa102dSLi Zefan 19520b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 19530caa102dSLi Zefan if (btrfs_root_readonly(root)) 19540caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 19550b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 19560caa102dSLi Zefan 19570caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 19580caa102dSLi Zefan ret = -EFAULT; 19590caa102dSLi Zefan 19600caa102dSLi Zefan return ret; 19610caa102dSLi Zefan } 19620caa102dSLi Zefan 19630caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 19640caa102dSLi Zefan void __user *arg) 19650caa102dSLi Zefan { 1966496ad9aaSAl Viro struct inode *inode = file_inode(file); 19670b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 19680caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 19690caa102dSLi Zefan struct btrfs_trans_handle *trans; 19700caa102dSLi Zefan u64 root_flags; 19710caa102dSLi Zefan u64 flags; 19720caa102dSLi Zefan int ret = 0; 19730caa102dSLi Zefan 197421cb47beSChristian Brauner if (!inode_owner_or_capable(&init_user_ns, inode)) 1975bd60ea0fSDavid Sterba return -EPERM; 1976bd60ea0fSDavid Sterba 1977b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1978b9ca0664SLiu Bo if (ret) 1979b9ca0664SLiu Bo goto out; 19800caa102dSLi Zefan 19814a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 1982b9ca0664SLiu Bo ret = -EINVAL; 1983b9ca0664SLiu Bo goto out_drop_write; 1984b9ca0664SLiu Bo } 19850caa102dSLi Zefan 1986b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1987b9ca0664SLiu Bo ret = -EFAULT; 1988b9ca0664SLiu Bo goto out_drop_write; 1989b9ca0664SLiu Bo } 19900caa102dSLi Zefan 1991b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1992b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1993b9ca0664SLiu Bo goto out_drop_write; 1994b9ca0664SLiu Bo } 19950caa102dSLi Zefan 19960b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 19970caa102dSLi Zefan 19980caa102dSLi Zefan /* nothing to do */ 19990caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 2000b9ca0664SLiu Bo goto out_drop_sem; 20010caa102dSLi Zefan 20020caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 20032c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 20040caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 20050caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 20062c686537SDavid Sterba } else { 20072c686537SDavid Sterba /* 20082c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 20092c686537SDavid Sterba * send 20102c686537SDavid Sterba */ 20112c686537SDavid Sterba spin_lock(&root->root_item_lock); 20122c686537SDavid Sterba if (root->send_in_progress == 0) { 20130caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 20140caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 20152c686537SDavid Sterba spin_unlock(&root->root_item_lock); 20162c686537SDavid Sterba } else { 20172c686537SDavid Sterba spin_unlock(&root->root_item_lock); 20180b246afaSJeff Mahoney btrfs_warn(fs_info, 20192c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 20202c686537SDavid Sterba root->root_key.objectid); 20212c686537SDavid Sterba ret = -EPERM; 20222c686537SDavid Sterba goto out_drop_sem; 20232c686537SDavid Sterba } 20242c686537SDavid Sterba } 20250caa102dSLi Zefan 20260caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 20270caa102dSLi Zefan if (IS_ERR(trans)) { 20280caa102dSLi Zefan ret = PTR_ERR(trans); 20290caa102dSLi Zefan goto out_reset; 20300caa102dSLi Zefan } 20310caa102dSLi Zefan 20320b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 20330caa102dSLi Zefan &root->root_key, &root->root_item); 20349417ebc8SNikolay Borisov if (ret < 0) { 20359417ebc8SNikolay Borisov btrfs_end_transaction(trans); 20369417ebc8SNikolay Borisov goto out_reset; 20379417ebc8SNikolay Borisov } 20380caa102dSLi Zefan 20399417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 20409417ebc8SNikolay Borisov 20410caa102dSLi Zefan out_reset: 20420caa102dSLi Zefan if (ret) 20430caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 2044b9ca0664SLiu Bo out_drop_sem: 20450b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 2046b9ca0664SLiu Bo out_drop_write: 2047b9ca0664SLiu Bo mnt_drop_write_file(file); 2048b9ca0664SLiu Bo out: 20490caa102dSLi Zefan return ret; 20500caa102dSLi Zefan } 20510caa102dSLi Zefan 2052ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 2053ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 2054ac8e9819SChris Mason { 2055abc6e134SChris Mason struct btrfs_key test; 2056abc6e134SChris Mason int ret; 2057abc6e134SChris Mason 2058abc6e134SChris Mason test.objectid = sk->min_objectid; 2059abc6e134SChris Mason test.type = sk->min_type; 2060abc6e134SChris Mason test.offset = sk->min_offset; 2061abc6e134SChris Mason 2062abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2063abc6e134SChris Mason if (ret < 0) 2064ac8e9819SChris Mason return 0; 2065abc6e134SChris Mason 2066abc6e134SChris Mason test.objectid = sk->max_objectid; 2067abc6e134SChris Mason test.type = sk->max_type; 2068abc6e134SChris Mason test.offset = sk->max_offset; 2069abc6e134SChris Mason 2070abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2071abc6e134SChris Mason if (ret > 0) 2072ac8e9819SChris Mason return 0; 2073ac8e9819SChris Mason return 1; 2074ac8e9819SChris Mason } 2075ac8e9819SChris Mason 2076df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2077ac8e9819SChris Mason struct btrfs_key *key, 2078ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 20799b6e817dSGerhard Heift size_t *buf_size, 2080ba346b35SGerhard Heift char __user *ubuf, 2081ac8e9819SChris Mason unsigned long *sk_offset, 2082ac8e9819SChris Mason int *num_found) 2083ac8e9819SChris Mason { 2084ac8e9819SChris Mason u64 found_transid; 2085ac8e9819SChris Mason struct extent_buffer *leaf; 2086ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2087dd81d459SNaohiro Aota struct btrfs_key test; 2088ac8e9819SChris Mason unsigned long item_off; 2089ac8e9819SChris Mason unsigned long item_len; 2090ac8e9819SChris Mason int nritems; 2091ac8e9819SChris Mason int i; 2092ac8e9819SChris Mason int slot; 2093ac8e9819SChris Mason int ret = 0; 2094ac8e9819SChris Mason 2095ac8e9819SChris Mason leaf = path->nodes[0]; 2096ac8e9819SChris Mason slot = path->slots[0]; 2097ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2098ac8e9819SChris Mason 2099ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2100ac8e9819SChris Mason i = nritems; 2101ac8e9819SChris Mason goto advance_key; 2102ac8e9819SChris Mason } 2103ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2104ac8e9819SChris Mason 2105ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2106ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 2107ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 2108ac8e9819SChris Mason 210903b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 211003b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 211103b71c6cSGabriel de Perthuis continue; 211203b71c6cSGabriel de Perthuis 21139b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 21148f5f6178SGerhard Heift if (*num_found) { 2115ac8e9819SChris Mason ret = 1; 21168f5f6178SGerhard Heift goto out; 21178f5f6178SGerhard Heift } 21188f5f6178SGerhard Heift 21198f5f6178SGerhard Heift /* 21208f5f6178SGerhard Heift * return one empty item back for v1, which does not 21218f5f6178SGerhard Heift * handle -EOVERFLOW 21228f5f6178SGerhard Heift */ 21238f5f6178SGerhard Heift 21249b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2125ac8e9819SChris Mason item_len = 0; 21268f5f6178SGerhard Heift ret = -EOVERFLOW; 21278f5f6178SGerhard Heift } 2128ac8e9819SChris Mason 21299b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2130ac8e9819SChris Mason ret = 1; 213125c9bc2eSGerhard Heift goto out; 2132ac8e9819SChris Mason } 2133ac8e9819SChris Mason 2134ac8e9819SChris Mason sh.objectid = key->objectid; 2135ac8e9819SChris Mason sh.offset = key->offset; 2136ac8e9819SChris Mason sh.type = key->type; 2137ac8e9819SChris Mason sh.len = item_len; 2138ac8e9819SChris Mason sh.transid = found_transid; 2139ac8e9819SChris Mason 2140a48b73ecSJosef Bacik /* 2141a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 2142a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 2143a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 2144a48b73ecSJosef Bacik * properly this next time through 2145a48b73ecSJosef Bacik */ 2146a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 2147a48b73ecSJosef Bacik ret = 0; 2148ba346b35SGerhard Heift goto out; 2149ba346b35SGerhard Heift } 2150ba346b35SGerhard Heift 2151ac8e9819SChris Mason *sk_offset += sizeof(sh); 2152ac8e9819SChris Mason 2153ac8e9819SChris Mason if (item_len) { 2154ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2155a48b73ecSJosef Bacik /* 2156a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 2157a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 2158a48b73ecSJosef Bacik */ 2159a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 2160ba346b35SGerhard Heift item_off, item_len)) { 2161a48b73ecSJosef Bacik ret = 0; 2162a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 2163ba346b35SGerhard Heift goto out; 2164ba346b35SGerhard Heift } 2165ba346b35SGerhard Heift 2166ac8e9819SChris Mason *sk_offset += item_len; 2167ac8e9819SChris Mason } 2168e2156867SHugo Mills (*num_found)++; 2169ac8e9819SChris Mason 21708f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 21718f5f6178SGerhard Heift goto out; 21728f5f6178SGerhard Heift 217325c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 217425c9bc2eSGerhard Heift ret = 1; 217525c9bc2eSGerhard Heift goto out; 217625c9bc2eSGerhard Heift } 2177ac8e9819SChris Mason } 2178ac8e9819SChris Mason advance_key: 2179ac8e9819SChris Mason ret = 0; 2180dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2181dd81d459SNaohiro Aota test.type = sk->max_type; 2182dd81d459SNaohiro Aota test.offset = sk->max_offset; 2183dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2184dd81d459SNaohiro Aota ret = 1; 2185dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2186abc6e134SChris Mason key->offset++; 2187dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2188abc6e134SChris Mason key->offset = 0; 2189abc6e134SChris Mason key->type++; 2190dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2191abc6e134SChris Mason key->offset = 0; 2192abc6e134SChris Mason key->type = 0; 2193abc6e134SChris Mason key->objectid++; 2194abc6e134SChris Mason } else 2195abc6e134SChris Mason ret = 1; 219625c9bc2eSGerhard Heift out: 2197ba346b35SGerhard Heift /* 2198ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2199ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2200ba346b35SGerhard Heift * * all items were found 2201ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2202ba346b35SGerhard Heift * leaf 2203ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2204ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2205ba346b35SGerhard Heift */ 2206ac8e9819SChris Mason return ret; 2207ac8e9819SChris Mason } 2208ac8e9819SChris Mason 2209ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 221012544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 22119b6e817dSGerhard Heift size_t *buf_size, 2212ba346b35SGerhard Heift char __user *ubuf) 2213ac8e9819SChris Mason { 22140b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2215ac8e9819SChris Mason struct btrfs_root *root; 2216ac8e9819SChris Mason struct btrfs_key key; 2217ac8e9819SChris Mason struct btrfs_path *path; 2218ac8e9819SChris Mason int ret; 2219ac8e9819SChris Mason int num_found = 0; 2220ac8e9819SChris Mason unsigned long sk_offset = 0; 2221ac8e9819SChris Mason 22229b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 22239b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 222412544442SGerhard Heift return -EOVERFLOW; 22259b6e817dSGerhard Heift } 222612544442SGerhard Heift 2227ac8e9819SChris Mason path = btrfs_alloc_path(); 2228ac8e9819SChris Mason if (!path) 2229ac8e9819SChris Mason return -ENOMEM; 2230ac8e9819SChris Mason 2231ac8e9819SChris Mason if (sk->tree_id == 0) { 2232ac8e9819SChris Mason /* search the root of the inode that was passed */ 223300246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2234ac8e9819SChris Mason } else { 223556e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2236ac8e9819SChris Mason if (IS_ERR(root)) { 2237ac8e9819SChris Mason btrfs_free_path(path); 2238ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2239ac8e9819SChris Mason } 2240ac8e9819SChris Mason } 2241ac8e9819SChris Mason 2242ac8e9819SChris Mason key.objectid = sk->min_objectid; 2243ac8e9819SChris Mason key.type = sk->min_type; 2244ac8e9819SChris Mason key.offset = sk->min_offset; 2245ac8e9819SChris Mason 2246ac8e9819SChris Mason while (1) { 22471c78544eSFilipe Manana ret = fault_in_pages_writeable(ubuf + sk_offset, 22481c78544eSFilipe Manana *buf_size - sk_offset); 2249a48b73ecSJosef Bacik if (ret) 2250a48b73ecSJosef Bacik break; 2251a48b73ecSJosef Bacik 22526174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2253ac8e9819SChris Mason if (ret != 0) { 2254ac8e9819SChris Mason if (ret > 0) 2255ac8e9819SChris Mason ret = 0; 2256ac8e9819SChris Mason goto err; 2257ac8e9819SChris Mason } 2258df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2259ac8e9819SChris Mason &sk_offset, &num_found); 2260b3b4aa74SDavid Sterba btrfs_release_path(path); 226125c9bc2eSGerhard Heift if (ret) 2262ac8e9819SChris Mason break; 2263ac8e9819SChris Mason 2264ac8e9819SChris Mason } 22658f5f6178SGerhard Heift if (ret > 0) 2266ac8e9819SChris Mason ret = 0; 2267ac8e9819SChris Mason err: 2268ac8e9819SChris Mason sk->nr_items = num_found; 226900246528SJosef Bacik btrfs_put_root(root); 2270ac8e9819SChris Mason btrfs_free_path(path); 2271ac8e9819SChris Mason return ret; 2272ac8e9819SChris Mason } 2273ac8e9819SChris Mason 2274ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2275ac8e9819SChris Mason void __user *argp) 2276ac8e9819SChris Mason { 2277ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2278ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2279ac8e9819SChris Mason struct inode *inode; 2280ac8e9819SChris Mason int ret; 22819b6e817dSGerhard Heift size_t buf_size; 2282ac8e9819SChris Mason 2283ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2284ac8e9819SChris Mason return -EPERM; 2285ac8e9819SChris Mason 2286ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2287ac8e9819SChris Mason 2288ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2289ba346b35SGerhard Heift return -EFAULT; 2290ba346b35SGerhard Heift 2291ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2292ac8e9819SChris Mason 2293496ad9aaSAl Viro inode = file_inode(file); 2294ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 22958f5f6178SGerhard Heift 22968f5f6178SGerhard Heift /* 22978f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 22988f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 22998f5f6178SGerhard Heift */ 23008f5f6178SGerhard Heift if (ret == -EOVERFLOW) 23018f5f6178SGerhard Heift ret = 0; 23028f5f6178SGerhard Heift 2303ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2304ac8e9819SChris Mason ret = -EFAULT; 2305ac8e9819SChris Mason return ret; 2306ac8e9819SChris Mason } 2307ac8e9819SChris Mason 2308cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2309cc68a8a5SGerhard Heift void __user *argp) 2310cc68a8a5SGerhard Heift { 2311cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2312cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2313cc68a8a5SGerhard Heift struct inode *inode; 2314cc68a8a5SGerhard Heift int ret; 2315cc68a8a5SGerhard Heift size_t buf_size; 2316ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2317cc68a8a5SGerhard Heift 2318cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2319cc68a8a5SGerhard Heift return -EPERM; 2320cc68a8a5SGerhard Heift 2321cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2322cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2323cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2324cc68a8a5SGerhard Heift return -EFAULT; 2325cc68a8a5SGerhard Heift 2326cc68a8a5SGerhard Heift buf_size = args.buf_size; 2327cc68a8a5SGerhard Heift 2328cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2329cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2330cc68a8a5SGerhard Heift buf_size = buf_limit; 2331cc68a8a5SGerhard Heift 2332cc68a8a5SGerhard Heift inode = file_inode(file); 2333cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2334718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2335cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2336cc68a8a5SGerhard Heift ret = -EFAULT; 2337cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2338cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2339cc68a8a5SGerhard Heift ret = -EFAULT; 2340cc68a8a5SGerhard Heift 234176dda93cSYan, Zheng return ret; 234276dda93cSYan, Zheng } 234376dda93cSYan, Zheng 234498d377a0STARUISI Hiroaki /* 2345ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2346ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 234798d377a0STARUISI Hiroaki */ 234898d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 234998d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 235098d377a0STARUISI Hiroaki { 235198d377a0STARUISI Hiroaki struct btrfs_root *root; 235298d377a0STARUISI Hiroaki struct btrfs_key key; 2353ac8e9819SChris Mason char *ptr; 235498d377a0STARUISI Hiroaki int ret = -1; 235598d377a0STARUISI Hiroaki int slot; 235698d377a0STARUISI Hiroaki int len; 235798d377a0STARUISI Hiroaki int total_len = 0; 235898d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 235998d377a0STARUISI Hiroaki struct extent_buffer *l; 236098d377a0STARUISI Hiroaki struct btrfs_path *path; 236198d377a0STARUISI Hiroaki 236298d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 236398d377a0STARUISI Hiroaki name[0]='\0'; 236498d377a0STARUISI Hiroaki return 0; 236598d377a0STARUISI Hiroaki } 236698d377a0STARUISI Hiroaki 236798d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 236898d377a0STARUISI Hiroaki if (!path) 236998d377a0STARUISI Hiroaki return -ENOMEM; 237098d377a0STARUISI Hiroaki 2371c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 237298d377a0STARUISI Hiroaki 237356e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 237498d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2375ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 237688234012SJosef Bacik root = NULL; 237788234012SJosef Bacik goto out; 237888234012SJosef Bacik } 237998d377a0STARUISI Hiroaki 238098d377a0STARUISI Hiroaki key.objectid = dirid; 238198d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 23828ad6fcabSChris Mason key.offset = (u64)-1; 238398d377a0STARUISI Hiroaki 238498d377a0STARUISI Hiroaki while (1) { 238598d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 238698d377a0STARUISI Hiroaki if (ret < 0) 238798d377a0STARUISI Hiroaki goto out; 238818674c6cSFilipe David Borba Manana else if (ret > 0) { 238918674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 239018674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 239118674c6cSFilipe David Borba Manana if (ret < 0) 239218674c6cSFilipe David Borba Manana goto out; 239318674c6cSFilipe David Borba Manana else if (ret > 0) { 2394ac8e9819SChris Mason ret = -ENOENT; 239598d377a0STARUISI Hiroaki goto out; 2396ac8e9819SChris Mason } 239718674c6cSFilipe David Borba Manana } 239818674c6cSFilipe David Borba Manana 239918674c6cSFilipe David Borba Manana l = path->nodes[0]; 240018674c6cSFilipe David Borba Manana slot = path->slots[0]; 240118674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 240298d377a0STARUISI Hiroaki 240398d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 240498d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 240598d377a0STARUISI Hiroaki ptr -= len + 1; 240698d377a0STARUISI Hiroaki total_len += len + 1; 2407a696cf35SFilipe David Borba Manana if (ptr < name) { 2408a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 240998d377a0STARUISI Hiroaki goto out; 2410a696cf35SFilipe David Borba Manana } 241198d377a0STARUISI Hiroaki 241298d377a0STARUISI Hiroaki *(ptr + len) = '/'; 241398d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 241498d377a0STARUISI Hiroaki 241598d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 241698d377a0STARUISI Hiroaki break; 241798d377a0STARUISI Hiroaki 2418b3b4aa74SDavid Sterba btrfs_release_path(path); 241998d377a0STARUISI Hiroaki key.objectid = key.offset; 24208ad6fcabSChris Mason key.offset = (u64)-1; 242198d377a0STARUISI Hiroaki dirid = key.objectid; 242298d377a0STARUISI Hiroaki } 242377906a50SLi Zefan memmove(name, ptr, total_len); 242498d377a0STARUISI Hiroaki name[total_len] = '\0'; 242598d377a0STARUISI Hiroaki ret = 0; 242698d377a0STARUISI Hiroaki out: 242700246528SJosef Bacik btrfs_put_root(root); 242898d377a0STARUISI Hiroaki btrfs_free_path(path); 2429ac8e9819SChris Mason return ret; 2430ac8e9819SChris Mason } 2431ac8e9819SChris Mason 243223d0b79dSTomohiro Misono static int btrfs_search_path_in_tree_user(struct inode *inode, 243323d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 243423d0b79dSTomohiro Misono { 243523d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 243623d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 243723d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 243823d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 243923d0b79dSTomohiro Misono u64 dirid = args->dirid; 244023d0b79dSTomohiro Misono unsigned long item_off; 244123d0b79dSTomohiro Misono unsigned long item_len; 244223d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 244323d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2444b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 244523d0b79dSTomohiro Misono struct btrfs_path *path; 244623d0b79dSTomohiro Misono struct btrfs_key key, key2; 244723d0b79dSTomohiro Misono struct extent_buffer *leaf; 244823d0b79dSTomohiro Misono struct inode *temp_inode; 244923d0b79dSTomohiro Misono char *ptr; 245023d0b79dSTomohiro Misono int slot; 245123d0b79dSTomohiro Misono int len; 245223d0b79dSTomohiro Misono int total_len = 0; 245323d0b79dSTomohiro Misono int ret; 245423d0b79dSTomohiro Misono 245523d0b79dSTomohiro Misono path = btrfs_alloc_path(); 245623d0b79dSTomohiro Misono if (!path) 245723d0b79dSTomohiro Misono return -ENOMEM; 245823d0b79dSTomohiro Misono 245923d0b79dSTomohiro Misono /* 246023d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 246123d0b79dSTomohiro Misono * construct the path in from the bottom up. 246223d0b79dSTomohiro Misono */ 246323d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 246423d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 246523d0b79dSTomohiro Misono 246656e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 246723d0b79dSTomohiro Misono if (IS_ERR(root)) { 246823d0b79dSTomohiro Misono ret = PTR_ERR(root); 246923d0b79dSTomohiro Misono goto out; 247023d0b79dSTomohiro Misono } 247123d0b79dSTomohiro Misono 247223d0b79dSTomohiro Misono key.objectid = dirid; 247323d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 247423d0b79dSTomohiro Misono key.offset = (u64)-1; 247523d0b79dSTomohiro Misono while (1) { 247623d0b79dSTomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 247723d0b79dSTomohiro Misono if (ret < 0) { 2478b8a49ae1SJosef Bacik goto out_put; 247923d0b79dSTomohiro Misono } else if (ret > 0) { 248023d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 248123d0b79dSTomohiro Misono BTRFS_INODE_REF_KEY); 248223d0b79dSTomohiro Misono if (ret < 0) { 2483b8a49ae1SJosef Bacik goto out_put; 248423d0b79dSTomohiro Misono } else if (ret > 0) { 248523d0b79dSTomohiro Misono ret = -ENOENT; 2486b8a49ae1SJosef Bacik goto out_put; 248723d0b79dSTomohiro Misono } 248823d0b79dSTomohiro Misono } 248923d0b79dSTomohiro Misono 249023d0b79dSTomohiro Misono leaf = path->nodes[0]; 249123d0b79dSTomohiro Misono slot = path->slots[0]; 249223d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 249323d0b79dSTomohiro Misono 249423d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 249523d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 249623d0b79dSTomohiro Misono ptr -= len + 1; 249723d0b79dSTomohiro Misono total_len += len + 1; 249823d0b79dSTomohiro Misono if (ptr < args->path) { 249923d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2500b8a49ae1SJosef Bacik goto out_put; 250123d0b79dSTomohiro Misono } 250223d0b79dSTomohiro Misono 250323d0b79dSTomohiro Misono *(ptr + len) = '/'; 250423d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 250523d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 250623d0b79dSTomohiro Misono 250723d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 250823d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 250923d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 251023d0b79dSTomohiro Misono if (ret < 0) { 2511b8a49ae1SJosef Bacik goto out_put; 251223d0b79dSTomohiro Misono } else if (ret > 0) { 251323d0b79dSTomohiro Misono ret = -ENOENT; 2514b8a49ae1SJosef Bacik goto out_put; 251523d0b79dSTomohiro Misono } 251623d0b79dSTomohiro Misono 251723d0b79dSTomohiro Misono leaf = path->nodes[0]; 251823d0b79dSTomohiro Misono slot = path->slots[0]; 251923d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 252023d0b79dSTomohiro Misono if (key2.objectid != dirid) { 252123d0b79dSTomohiro Misono ret = -ENOENT; 2522b8a49ae1SJosef Bacik goto out_put; 252323d0b79dSTomohiro Misono } 252423d0b79dSTomohiro Misono 25250202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 25263ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 25273ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2528b8a49ae1SJosef Bacik goto out_put; 25293ca57bd6SMisono Tomohiro } 253047291baaSChristian Brauner ret = inode_permission(&init_user_ns, temp_inode, 253147291baaSChristian Brauner MAY_READ | MAY_EXEC); 253223d0b79dSTomohiro Misono iput(temp_inode); 253323d0b79dSTomohiro Misono if (ret) { 253423d0b79dSTomohiro Misono ret = -EACCES; 2535b8a49ae1SJosef Bacik goto out_put; 253623d0b79dSTomohiro Misono } 253723d0b79dSTomohiro Misono 253823d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 253923d0b79dSTomohiro Misono break; 254023d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 254123d0b79dSTomohiro Misono ret = -EACCES; 2542b8a49ae1SJosef Bacik goto out_put; 254323d0b79dSTomohiro Misono } 254423d0b79dSTomohiro Misono 254523d0b79dSTomohiro Misono btrfs_release_path(path); 254623d0b79dSTomohiro Misono key.objectid = key.offset; 254723d0b79dSTomohiro Misono key.offset = (u64)-1; 254823d0b79dSTomohiro Misono dirid = key.objectid; 254923d0b79dSTomohiro Misono } 255023d0b79dSTomohiro Misono 255123d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 255223d0b79dSTomohiro Misono args->path[total_len] = '\0'; 255300246528SJosef Bacik btrfs_put_root(root); 2554b8a49ae1SJosef Bacik root = NULL; 255523d0b79dSTomohiro Misono btrfs_release_path(path); 255623d0b79dSTomohiro Misono } 255723d0b79dSTomohiro Misono 255823d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 255923d0b79dSTomohiro Misono key.objectid = treeid; 256023d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 256123d0b79dSTomohiro Misono key.offset = args->treeid; 2562b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 256323d0b79dSTomohiro Misono if (ret < 0) { 256423d0b79dSTomohiro Misono goto out; 256523d0b79dSTomohiro Misono } else if (ret > 0) { 256623d0b79dSTomohiro Misono ret = -ENOENT; 256723d0b79dSTomohiro Misono goto out; 256823d0b79dSTomohiro Misono } 256923d0b79dSTomohiro Misono 257023d0b79dSTomohiro Misono leaf = path->nodes[0]; 257123d0b79dSTomohiro Misono slot = path->slots[0]; 257223d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 257323d0b79dSTomohiro Misono 257423d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 257523d0b79dSTomohiro Misono item_len = btrfs_item_size_nr(leaf, slot); 257623d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 257723d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 257823d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 257923d0b79dSTomohiro Misono ret = -EINVAL; 258023d0b79dSTomohiro Misono goto out; 258123d0b79dSTomohiro Misono } 258223d0b79dSTomohiro Misono 258323d0b79dSTomohiro Misono /* Copy subvolume's name */ 258423d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 258523d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 258623d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 258723d0b79dSTomohiro Misono args->name[item_len] = 0; 258823d0b79dSTomohiro Misono 2589b8a49ae1SJosef Bacik out_put: 259000246528SJosef Bacik btrfs_put_root(root); 259123d0b79dSTomohiro Misono out: 259223d0b79dSTomohiro Misono btrfs_free_path(path); 259323d0b79dSTomohiro Misono return ret; 259423d0b79dSTomohiro Misono } 259523d0b79dSTomohiro Misono 2596ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2597ac8e9819SChris Mason void __user *argp) 2598ac8e9819SChris Mason { 2599ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2600ac8e9819SChris Mason struct inode *inode; 260101b810b8SDavid Sterba int ret = 0; 2602ac8e9819SChris Mason 26032354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 26042354d08fSJulia Lawall if (IS_ERR(args)) 26052354d08fSJulia Lawall return PTR_ERR(args); 2606c2b96929SDan Carpenter 2607496ad9aaSAl Viro inode = file_inode(file); 2608ac8e9819SChris Mason 260901b810b8SDavid Sterba /* 261001b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 261101b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 261201b810b8SDavid Sterba */ 26131b53ac4dSChris Mason if (args->treeid == 0) 26141b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 26151b53ac4dSChris Mason 261601b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 261701b810b8SDavid Sterba args->name[0] = 0; 261801b810b8SDavid Sterba goto out; 261901b810b8SDavid Sterba } 262001b810b8SDavid Sterba 262101b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 262201b810b8SDavid Sterba ret = -EPERM; 262301b810b8SDavid Sterba goto out; 262401b810b8SDavid Sterba } 262501b810b8SDavid Sterba 2626ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2627ac8e9819SChris Mason args->treeid, args->objectid, 2628ac8e9819SChris Mason args->name); 2629ac8e9819SChris Mason 263001b810b8SDavid Sterba out: 2631ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2632ac8e9819SChris Mason ret = -EFAULT; 2633ac8e9819SChris Mason 2634ac8e9819SChris Mason kfree(args); 263598d377a0STARUISI Hiroaki return ret; 263698d377a0STARUISI Hiroaki } 263798d377a0STARUISI Hiroaki 263823d0b79dSTomohiro Misono /* 263923d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 264023d0b79dSTomohiro Misono * 264123d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 264223d0b79dSTomohiro Misono * 264323d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 264423d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 264523d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 264623d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 264723d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 264823d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 264923d0b79dSTomohiro Misono */ 265023d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 265123d0b79dSTomohiro Misono { 265223d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 265323d0b79dSTomohiro Misono struct inode *inode; 265423d0b79dSTomohiro Misono int ret; 265523d0b79dSTomohiro Misono 265623d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 265723d0b79dSTomohiro Misono if (IS_ERR(args)) 265823d0b79dSTomohiro Misono return PTR_ERR(args); 265923d0b79dSTomohiro Misono 266023d0b79dSTomohiro Misono inode = file_inode(file); 266123d0b79dSTomohiro Misono 266223d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 266323d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 266423d0b79dSTomohiro Misono /* 266523d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 266623d0b79dSTomohiro Misono * called 266723d0b79dSTomohiro Misono */ 266823d0b79dSTomohiro Misono kfree(args); 266923d0b79dSTomohiro Misono return -EACCES; 267023d0b79dSTomohiro Misono } 267123d0b79dSTomohiro Misono 267223d0b79dSTomohiro Misono ret = btrfs_search_path_in_tree_user(inode, args); 267323d0b79dSTomohiro Misono 267423d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 267523d0b79dSTomohiro Misono ret = -EFAULT; 267623d0b79dSTomohiro Misono 267723d0b79dSTomohiro Misono kfree(args); 267823d0b79dSTomohiro Misono return ret; 267923d0b79dSTomohiro Misono } 268023d0b79dSTomohiro Misono 2681b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 2682b64ec075STomohiro Misono static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) 2683b64ec075STomohiro Misono { 2684b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2685b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2686b64ec075STomohiro Misono struct btrfs_root *root; 2687b64ec075STomohiro Misono struct btrfs_path *path; 2688b64ec075STomohiro Misono struct btrfs_key key; 2689b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2690b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2691b64ec075STomohiro Misono struct extent_buffer *leaf; 2692b64ec075STomohiro Misono unsigned long item_off; 2693b64ec075STomohiro Misono unsigned long item_len; 2694b64ec075STomohiro Misono struct inode *inode; 2695b64ec075STomohiro Misono int slot; 2696b64ec075STomohiro Misono int ret = 0; 2697b64ec075STomohiro Misono 2698b64ec075STomohiro Misono path = btrfs_alloc_path(); 2699b64ec075STomohiro Misono if (!path) 2700b64ec075STomohiro Misono return -ENOMEM; 2701b64ec075STomohiro Misono 2702b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2703b64ec075STomohiro Misono if (!subvol_info) { 2704b64ec075STomohiro Misono btrfs_free_path(path); 2705b64ec075STomohiro Misono return -ENOMEM; 2706b64ec075STomohiro Misono } 2707b64ec075STomohiro Misono 2708b64ec075STomohiro Misono inode = file_inode(file); 2709b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2710b64ec075STomohiro Misono 2711b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2712b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 271356e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2714b64ec075STomohiro Misono if (IS_ERR(root)) { 2715b64ec075STomohiro Misono ret = PTR_ERR(root); 271604734e84SJosef Bacik goto out_free; 271704734e84SJosef Bacik } 2718b64ec075STomohiro Misono root_item = &root->root_item; 2719b64ec075STomohiro Misono 2720b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2721b64ec075STomohiro Misono 2722b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2723b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2724b64ec075STomohiro Misono 2725b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2726b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2727b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2728b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2729b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2730b64ec075STomohiro Misono 2731b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2732b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2733b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2734b64ec075STomohiro Misono 2735b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2736b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2737b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2738b64ec075STomohiro Misono 2739b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2740b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2741b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2742b64ec075STomohiro Misono 2743b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2744b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2745b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2746b64ec075STomohiro Misono 2747b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2748b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2749b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2750b64ec075STomohiro Misono key.offset = 0; 275104734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2752b64ec075STomohiro Misono if (ret < 0) { 2753b64ec075STomohiro Misono goto out; 2754b64ec075STomohiro Misono } else if (path->slots[0] >= 2755b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 275604734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2757b64ec075STomohiro Misono if (ret < 0) { 2758b64ec075STomohiro Misono goto out; 2759b64ec075STomohiro Misono } else if (ret > 0) { 2760b64ec075STomohiro Misono ret = -EUCLEAN; 2761b64ec075STomohiro Misono goto out; 2762b64ec075STomohiro Misono } 2763b64ec075STomohiro Misono } 2764b64ec075STomohiro Misono 2765b64ec075STomohiro Misono leaf = path->nodes[0]; 2766b64ec075STomohiro Misono slot = path->slots[0]; 2767b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2768b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2769b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2770b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2771b64ec075STomohiro Misono 2772b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2773b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2774b64ec075STomohiro Misono 2775b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2776b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 2777b64ec075STomohiro Misono item_len = btrfs_item_size_nr(leaf, slot) 2778b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2779b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2780b64ec075STomohiro Misono item_off, item_len); 2781b64ec075STomohiro Misono } else { 2782b64ec075STomohiro Misono ret = -ENOENT; 2783b64ec075STomohiro Misono goto out; 2784b64ec075STomohiro Misono } 2785b64ec075STomohiro Misono } 2786b64ec075STomohiro Misono 2787b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2788b64ec075STomohiro Misono ret = -EFAULT; 2789b64ec075STomohiro Misono 2790b64ec075STomohiro Misono out: 279100246528SJosef Bacik btrfs_put_root(root); 279204734e84SJosef Bacik out_free: 2793b64ec075STomohiro Misono btrfs_free_path(path); 2794b091f7feSWaiman Long kfree(subvol_info); 2795b64ec075STomohiro Misono return ret; 2796b64ec075STomohiro Misono } 2797b64ec075STomohiro Misono 279842e4b520STomohiro Misono /* 279942e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 280042e4b520STomohiro Misono * except the subvolume name. 280142e4b520STomohiro Misono */ 280242e4b520STomohiro Misono static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp) 280342e4b520STomohiro Misono { 280442e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 280542e4b520STomohiro Misono struct btrfs_root_ref *rref; 280642e4b520STomohiro Misono struct btrfs_root *root; 280742e4b520STomohiro Misono struct btrfs_path *path; 280842e4b520STomohiro Misono struct btrfs_key key; 280942e4b520STomohiro Misono struct extent_buffer *leaf; 281042e4b520STomohiro Misono struct inode *inode; 281142e4b520STomohiro Misono u64 objectid; 281242e4b520STomohiro Misono int slot; 281342e4b520STomohiro Misono int ret; 281442e4b520STomohiro Misono u8 found; 281542e4b520STomohiro Misono 281642e4b520STomohiro Misono path = btrfs_alloc_path(); 281742e4b520STomohiro Misono if (!path) 281842e4b520STomohiro Misono return -ENOMEM; 281942e4b520STomohiro Misono 282042e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 282142e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 282242e4b520STomohiro Misono btrfs_free_path(path); 282342e4b520STomohiro Misono return PTR_ERR(rootrefs); 282442e4b520STomohiro Misono } 282542e4b520STomohiro Misono 282642e4b520STomohiro Misono inode = file_inode(file); 282742e4b520STomohiro Misono root = BTRFS_I(inode)->root->fs_info->tree_root; 282842e4b520STomohiro Misono objectid = BTRFS_I(inode)->root->root_key.objectid; 282942e4b520STomohiro Misono 283042e4b520STomohiro Misono key.objectid = objectid; 283142e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 283242e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 283342e4b520STomohiro Misono found = 0; 283442e4b520STomohiro Misono 283542e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 283642e4b520STomohiro Misono if (ret < 0) { 283742e4b520STomohiro Misono goto out; 283842e4b520STomohiro Misono } else if (path->slots[0] >= 283942e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 284042e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 284142e4b520STomohiro Misono if (ret < 0) { 284242e4b520STomohiro Misono goto out; 284342e4b520STomohiro Misono } else if (ret > 0) { 284442e4b520STomohiro Misono ret = -EUCLEAN; 284542e4b520STomohiro Misono goto out; 284642e4b520STomohiro Misono } 284742e4b520STomohiro Misono } 284842e4b520STomohiro Misono while (1) { 284942e4b520STomohiro Misono leaf = path->nodes[0]; 285042e4b520STomohiro Misono slot = path->slots[0]; 285142e4b520STomohiro Misono 285242e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 285342e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 285442e4b520STomohiro Misono ret = 0; 285542e4b520STomohiro Misono goto out; 285642e4b520STomohiro Misono } 285742e4b520STomohiro Misono 285842e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 285942e4b520STomohiro Misono ret = -EOVERFLOW; 286042e4b520STomohiro Misono goto out; 286142e4b520STomohiro Misono } 286242e4b520STomohiro Misono 286342e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 286442e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 286542e4b520STomohiro Misono rootrefs->rootref[found].dirid = 286642e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 286742e4b520STomohiro Misono found++; 286842e4b520STomohiro Misono 286942e4b520STomohiro Misono ret = btrfs_next_item(root, path); 287042e4b520STomohiro Misono if (ret < 0) { 287142e4b520STomohiro Misono goto out; 287242e4b520STomohiro Misono } else if (ret > 0) { 287342e4b520STomohiro Misono ret = -EUCLEAN; 287442e4b520STomohiro Misono goto out; 287542e4b520STomohiro Misono } 287642e4b520STomohiro Misono } 287742e4b520STomohiro Misono 287842e4b520STomohiro Misono out: 287942e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 288042e4b520STomohiro Misono rootrefs->num_items = found; 288142e4b520STomohiro Misono /* update min_treeid for next search */ 288242e4b520STomohiro Misono if (found) 288342e4b520STomohiro Misono rootrefs->min_treeid = 288442e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 288542e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 288642e4b520STomohiro Misono ret = -EFAULT; 288742e4b520STomohiro Misono } 288842e4b520STomohiro Misono 288942e4b520STomohiro Misono kfree(rootrefs); 289042e4b520STomohiro Misono btrfs_free_path(path); 289142e4b520STomohiro Misono 289242e4b520STomohiro Misono return ret; 289342e4b520STomohiro Misono } 289442e4b520STomohiro Misono 289576dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2896949964c9SMarcos Paulo de Souza void __user *arg, 2897949964c9SMarcos Paulo de Souza bool destroy_v2) 289876dda93cSYan, Zheng { 289954563d41SAl Viro struct dentry *parent = file->f_path.dentry; 29000b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 290176dda93cSYan, Zheng struct dentry *dentry; 29022b0143b5SDavid Howells struct inode *dir = d_inode(parent); 290376dda93cSYan, Zheng struct inode *inode; 290476dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 290576dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2906949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2907949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 2908949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2909949964c9SMarcos Paulo de Souza int subvol_namelen; 291076dda93cSYan, Zheng int err = 0; 2911949964c9SMarcos Paulo de Souza bool destroy_parent = false; 291276dda93cSYan, Zheng 2913949964c9SMarcos Paulo de Souza if (destroy_v2) { 2914949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2915949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2916949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2917325c50e3SJeff Mahoney 2918949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2919949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2920949964c9SMarcos Paulo de Souza goto out; 2921949964c9SMarcos Paulo de Souza } 292276dda93cSYan, Zheng 2923949964c9SMarcos Paulo de Souza /* 2924949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2925949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2926949964c9SMarcos Paulo de Souza */ 2927949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2928949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2929949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2930949964c9SMarcos Paulo de Souza 2931949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2932949964c9SMarcos Paulo de Souza if (err) 2933949964c9SMarcos Paulo de Souza goto out; 2934949964c9SMarcos Paulo de Souza } else { 2935949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 293676dda93cSYan, Zheng err = -EINVAL; 293776dda93cSYan, Zheng goto out; 293876dda93cSYan, Zheng } 293976dda93cSYan, Zheng 2940a561be71SAl Viro err = mnt_want_write_file(file); 294176dda93cSYan, Zheng if (err) 294276dda93cSYan, Zheng goto out; 294376dda93cSYan, Zheng 2944949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 2945949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 2946949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 2947949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 2948949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 2949949964c9SMarcos Paulo de Souza goto out_drop_write; 2950949964c9SMarcos Paulo de Souza } 2951949964c9SMarcos Paulo de Souza 2952949964c9SMarcos Paulo de Souza /* 2953949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 2954949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 2955949964c9SMarcos Paulo de Souza */ 2956949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 2957949964c9SMarcos Paulo de Souza 2958949964c9SMarcos Paulo de Souza /* 2959949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 2960949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 2961949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 2962949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 2963949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 2964949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 2965949964c9SMarcos Paulo de Souza */ 2966949964c9SMarcos Paulo de Souza dput(dentry); 2967949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 2968949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 2969949964c9SMarcos Paulo de Souza goto out_drop_write; 2970949964c9SMarcos Paulo de Souza } 2971949964c9SMarcos Paulo de Souza dir = d_inode(parent); 2972949964c9SMarcos Paulo de Souza 2973949964c9SMarcos Paulo de Souza /* 2974949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 2975949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 2976949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 2977949964c9SMarcos Paulo de Souza * new parent dentry. 2978949964c9SMarcos Paulo de Souza */ 2979949964c9SMarcos Paulo de Souza destroy_parent = true; 2980949964c9SMarcos Paulo de Souza 2981949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 2982949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 2983949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 2984949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 2985949964c9SMarcos Paulo de Souza goto free_parent; 2986949964c9SMarcos Paulo de Souza } 2987949964c9SMarcos Paulo de Souza /* subvol_name_ptr is already NULL termined */ 2988949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 2989949964c9SMarcos Paulo de Souza } 2990949964c9SMarcos Paulo de Souza } else { 2991949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 2992949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 2993949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 2994949964c9SMarcos Paulo de Souza 2995949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 2996949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 2997949964c9SMarcos Paulo de Souza 2998949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2999949964c9SMarcos Paulo de Souza if (err) 3000949964c9SMarcos Paulo de Souza goto out; 3001949964c9SMarcos Paulo de Souza } 3002949964c9SMarcos Paulo de Souza 3003949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 3004949964c9SMarcos Paulo de Souza 3005949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 3006949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 3007949964c9SMarcos Paulo de Souza err = -EINVAL; 3008949964c9SMarcos Paulo de Souza goto free_subvol_name; 3009949964c9SMarcos Paulo de Souza } 3010949964c9SMarcos Paulo de Souza 3011949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 3012949964c9SMarcos Paulo de Souza err = -ENOTDIR; 3013949964c9SMarcos Paulo de Souza goto free_subvol_name; 3014949964c9SMarcos Paulo de Souza } 3015521e0546SDavid Sterba 301600235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 301700235411SAl Viro if (err == -EINTR) 3018949964c9SMarcos Paulo de Souza goto free_subvol_name; 3019949964c9SMarcos Paulo de Souza dentry = lookup_one_len(subvol_name, parent, subvol_namelen); 302076dda93cSYan, Zheng if (IS_ERR(dentry)) { 302176dda93cSYan, Zheng err = PTR_ERR(dentry); 302276dda93cSYan, Zheng goto out_unlock_dir; 302376dda93cSYan, Zheng } 302476dda93cSYan, Zheng 30252b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 302676dda93cSYan, Zheng err = -ENOENT; 302776dda93cSYan, Zheng goto out_dput; 302876dda93cSYan, Zheng } 302976dda93cSYan, Zheng 30302b0143b5SDavid Howells inode = d_inode(dentry); 30314260f7c7SSage Weil dest = BTRFS_I(inode)->root; 30324260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 30334260f7c7SSage Weil /* 30344260f7c7SSage Weil * Regular user. Only allow this with a special mount 30354260f7c7SSage Weil * option, when the user has write+exec access to the 30364260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 30374260f7c7SSage Weil * allowed. 30384260f7c7SSage Weil * 30394260f7c7SSage Weil * Note that this is _not_ check that the subvol is 30404260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 30414260f7c7SSage Weil * otherwise be able to delete. 30424260f7c7SSage Weil * 30434260f7c7SSage Weil * Users who want to delete empty subvols should try 30444260f7c7SSage Weil * rmdir(2). 30454260f7c7SSage Weil */ 30464260f7c7SSage Weil err = -EPERM; 30470b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 30484260f7c7SSage Weil goto out_dput; 30494260f7c7SSage Weil 30504260f7c7SSage Weil /* 30514260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 30524260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 30534260f7c7SSage Weil * must be called on the dentry referencing the root 30544260f7c7SSage Weil * of the subvol, not a random directory contained 30554260f7c7SSage Weil * within it. 30564260f7c7SSage Weil */ 30574260f7c7SSage Weil err = -EINVAL; 30584260f7c7SSage Weil if (root == dest) 30594260f7c7SSage Weil goto out_dput; 30604260f7c7SSage Weil 306147291baaSChristian Brauner err = inode_permission(&init_user_ns, inode, 306247291baaSChristian Brauner MAY_WRITE | MAY_EXEC); 30634260f7c7SSage Weil if (err) 30644260f7c7SSage Weil goto out_dput; 30655c39da5bSMiao Xie } 30664260f7c7SSage Weil 30675c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 30684260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 30694260f7c7SSage Weil if (err) 30704260f7c7SSage Weil goto out_dput; 30714260f7c7SSage Weil 30724a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 307376dda93cSYan, Zheng err = -EINVAL; 307476dda93cSYan, Zheng goto out_dput; 307576dda93cSYan, Zheng } 307676dda93cSYan, Zheng 307764708539SJosef Bacik btrfs_inode_lock(inode, 0); 3078f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 307964708539SJosef Bacik btrfs_inode_unlock(inode, 0); 308046008d9dSAmir Goldstein if (!err) { 308146008d9dSAmir Goldstein fsnotify_rmdir(dir, dentry); 308276dda93cSYan, Zheng d_delete(dentry); 308346008d9dSAmir Goldstein } 3084fa6ac876SLiu Bo 308576dda93cSYan, Zheng out_dput: 308676dda93cSYan, Zheng dput(dentry); 308776dda93cSYan, Zheng out_unlock_dir: 308864708539SJosef Bacik btrfs_inode_unlock(dir, 0); 3089949964c9SMarcos Paulo de Souza free_subvol_name: 3090949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3091949964c9SMarcos Paulo de Souza free_parent: 3092949964c9SMarcos Paulo de Souza if (destroy_parent) 3093949964c9SMarcos Paulo de Souza dput(parent); 309400235411SAl Viro out_drop_write: 30952a79f17eSAl Viro mnt_drop_write_file(file); 309676dda93cSYan, Zheng out: 3097949964c9SMarcos Paulo de Souza kfree(vol_args2); 309876dda93cSYan, Zheng kfree(vol_args); 309976dda93cSYan, Zheng return err; 310076dda93cSYan, Zheng } 310176dda93cSYan, Zheng 31021e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3103f46b5a66SChristoph Hellwig { 3104496ad9aaSAl Viro struct inode *inode = file_inode(file); 3105f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 31061e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 3107c146afadSYan Zheng int ret; 3108c146afadSYan Zheng 310925122d15SIlya Dryomov ret = mnt_want_write_file(file); 311025122d15SIlya Dryomov if (ret) 311125122d15SIlya Dryomov return ret; 3112b83cc969SLi Zefan 311325122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 311425122d15SIlya Dryomov ret = -EROFS; 311525122d15SIlya Dryomov goto out; 31165ac00addSStefan Behrens } 3117f46b5a66SChristoph Hellwig 3118f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3119f46b5a66SChristoph Hellwig case S_IFDIR: 3120e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3121e441d54dSChris Mason ret = -EPERM; 3122e441d54dSChris Mason goto out; 3123e441d54dSChris Mason } 3124de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3125f46b5a66SChristoph Hellwig break; 3126f46b5a66SChristoph Hellwig case S_IFREG: 3127616d374eSAdam Borowski /* 3128616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3129616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3130616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3131616d374eSAdam Borowski */ 3132616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 313347291baaSChristian Brauner inode_permission(&init_user_ns, inode, MAY_WRITE)) { 3134616d374eSAdam Borowski ret = -EPERM; 3135e441d54dSChris Mason goto out; 3136e441d54dSChris Mason } 31371e701a32SChris Mason 31381e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 31391e701a32SChris Mason if (!range) { 31401e701a32SChris Mason ret = -ENOMEM; 31411e701a32SChris Mason goto out; 31421e701a32SChris Mason } 31431e701a32SChris Mason 31441e701a32SChris Mason if (argp) { 31451e701a32SChris Mason if (copy_from_user(range, argp, 31461e701a32SChris Mason sizeof(*range))) { 31471e701a32SChris Mason ret = -EFAULT; 31481e701a32SChris Mason kfree(range); 3149683be16eSDan Carpenter goto out; 31501e701a32SChris Mason } 31511e701a32SChris Mason /* compression requires us to start the IO */ 31521e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 31531e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 31541e701a32SChris Mason range->extent_thresh = (u32)-1; 31551e701a32SChris Mason } 31561e701a32SChris Mason } else { 31571e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 31581e701a32SChris Mason range->len = (u64)-1; 31591e701a32SChris Mason } 3160496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 31617c829b72SAnand Jain range, BTRFS_OLDEST_GENERATION, 0); 31624cb5300bSChris Mason if (ret > 0) 31634cb5300bSChris Mason ret = 0; 31641e701a32SChris Mason kfree(range); 3165f46b5a66SChristoph Hellwig break; 31668929ecfaSYan, Zheng default: 31678929ecfaSYan, Zheng ret = -EINVAL; 3168f46b5a66SChristoph Hellwig } 3169e441d54dSChris Mason out: 317025122d15SIlya Dryomov mnt_drop_write_file(file); 3171e441d54dSChris Mason return ret; 3172f46b5a66SChristoph Hellwig } 3173f46b5a66SChristoph Hellwig 31742ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3175f46b5a66SChristoph Hellwig { 3176f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3177f46b5a66SChristoph Hellwig int ret; 3178f46b5a66SChristoph Hellwig 3179e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3180e441d54dSChris Mason return -EPERM; 3181e441d54dSChris Mason 3182c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) 3183e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3184c9e9f97bSIlya Dryomov 3185dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3186c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3187c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3188c9e9f97bSIlya Dryomov goto out; 3189c9e9f97bSIlya Dryomov } 3190f46b5a66SChristoph Hellwig 31915516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 31922ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3193f46b5a66SChristoph Hellwig 319443d20761SAnand Jain if (!ret) 31950b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 319643d20761SAnand Jain 3197f46b5a66SChristoph Hellwig kfree(vol_args); 3198c9e9f97bSIlya Dryomov out: 3199c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3200f46b5a66SChristoph Hellwig return ret; 3201f46b5a66SChristoph Hellwig } 3202f46b5a66SChristoph Hellwig 32036b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3204f46b5a66SChristoph Hellwig { 32050b246afaSJeff Mahoney struct inode *inode = file_inode(file); 32060b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 32076b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 3208f46b5a66SChristoph Hellwig int ret; 3209*67ae34b6SDavid Sterba bool cancel = false; 3210f46b5a66SChristoph Hellwig 3211e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3212e441d54dSChris Mason return -EPERM; 3213e441d54dSChris Mason 3214da24927bSMiao Xie ret = mnt_want_write_file(file); 3215da24927bSMiao Xie if (ret) 3216da24927bSMiao Xie return ret; 3217c146afadSYan Zheng 3218dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3219c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3220c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3221c47ca32dSDan Carpenter goto err_drop; 3222c9e9f97bSIlya Dryomov } 3223f46b5a66SChristoph Hellwig 3224748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3225fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3226fd4e994bSOmar Sandoval goto out; 3227fd4e994bSOmar Sandoval } 32286b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 3229*67ae34b6SDavid Sterba if (!(vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) && 3230*67ae34b6SDavid Sterba strcmp("cancel", vol_args->name) == 0) 3231*67ae34b6SDavid Sterba cancel = true; 3232*67ae34b6SDavid Sterba 3233*67ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 3234*67ae34b6SDavid Sterba cancel); 3235*67ae34b6SDavid Sterba if (ret) 3236*67ae34b6SDavid Sterba goto out; 3237*67ae34b6SDavid Sterba /* Exclusive operation is now claimed */ 3238*67ae34b6SDavid Sterba 3239*67ae34b6SDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 3240*67ae34b6SDavid Sterba ret = btrfs_rm_device(fs_info, NULL, vol_args->devid); 3241*67ae34b6SDavid Sterba else 32422ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 3243*67ae34b6SDavid Sterba 3244c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3245183860f6SAnand Jain 32466b526ed7SAnand Jain if (!ret) { 3247735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 32480b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 32496b526ed7SAnand Jain vol_args->devid); 32506b526ed7SAnand Jain else 32510b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 32526b526ed7SAnand Jain vol_args->name); 32536b526ed7SAnand Jain } 3254183860f6SAnand Jain out: 3255183860f6SAnand Jain kfree(vol_args); 3256c47ca32dSDan Carpenter err_drop: 32574ac20c70SIlya Dryomov mnt_drop_write_file(file); 3258f46b5a66SChristoph Hellwig return ret; 3259f46b5a66SChristoph Hellwig } 3260f46b5a66SChristoph Hellwig 3261f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3262f46b5a66SChristoph Hellwig { 32630b246afaSJeff Mahoney struct inode *inode = file_inode(file); 32640b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3265f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3266f46b5a66SChristoph Hellwig int ret; 3267*67ae34b6SDavid Sterba bool cancel; 3268f46b5a66SChristoph Hellwig 3269f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3270f46b5a66SChristoph Hellwig return -EPERM; 3271f46b5a66SChristoph Hellwig 3272f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3273f46b5a66SChristoph Hellwig if (ret) 3274f46b5a66SChristoph Hellwig return ret; 3275f46b5a66SChristoph Hellwig 327658d7bbf8SDavid Sterba vol_args = memdup_user(arg, sizeof(*vol_args)); 327758d7bbf8SDavid Sterba if (IS_ERR(vol_args)) { 327858d7bbf8SDavid Sterba ret = PTR_ERR(vol_args); 3279*67ae34b6SDavid Sterba goto out_drop_write; 3280f46b5a66SChristoph Hellwig } 328158d7bbf8SDavid Sterba vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 3282*67ae34b6SDavid Sterba cancel = (strcmp("cancel", vol_args->name) == 0); 3283f46b5a66SChristoph Hellwig 3284*67ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 3285*67ae34b6SDavid Sterba cancel); 3286*67ae34b6SDavid Sterba if (ret == 0) { 3287*67ae34b6SDavid Sterba ret = btrfs_rm_device(fs_info, vol_args->name, 0); 3288f46b5a66SChristoph Hellwig if (!ret) 32890b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3290c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3291*67ae34b6SDavid Sterba } 3292*67ae34b6SDavid Sterba 3293*67ae34b6SDavid Sterba kfree(vol_args); 329458d7bbf8SDavid Sterba out_drop_write: 3295f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 329658d7bbf8SDavid Sterba 3297f46b5a66SChristoph Hellwig return ret; 3298f46b5a66SChristoph Hellwig } 3299f46b5a66SChristoph Hellwig 33002ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 33012ff7e61eSJeff Mahoney void __user *arg) 3302475f6387SJan Schmidt { 3303027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3304475f6387SJan Schmidt struct btrfs_device *device; 33050b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3306137c5418SJohannes Thumshirn u64 flags_in; 3307027ed2f0SLi Zefan int ret = 0; 3308475f6387SJan Schmidt 3309137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3310137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3311137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3312137c5418SJohannes Thumshirn 3313137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3314137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3315027ed2f0SLi Zefan 3316d03262c7SDavid Sterba rcu_read_lock(); 3317027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3318475f6387SJan Schmidt 3319d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3320027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3321027ed2f0SLi Zefan fi_args->max_id = device->devid; 3322475f6387SJan Schmidt } 3323d03262c7SDavid Sterba rcu_read_unlock(); 3324475f6387SJan Schmidt 3325de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3326bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3327bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3328bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 332980a773fbSDavid Sterba 3330137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3331137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3332137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3333137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3334137c5418SJohannes Thumshirn } 3335137c5418SJohannes Thumshirn 33360fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 33370fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 33380fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 33390fb408a5SJohannes Thumshirn } 33400fb408a5SJohannes Thumshirn 334149bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 334249bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 334349bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 334449bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 334549bac897SJohannes Thumshirn } 334649bac897SJohannes Thumshirn 3347027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3348027ed2f0SLi Zefan ret = -EFAULT; 3349475f6387SJan Schmidt 3350027ed2f0SLi Zefan kfree(fi_args); 3351027ed2f0SLi Zefan return ret; 3352475f6387SJan Schmidt } 3353475f6387SJan Schmidt 33542ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 33552ff7e61eSJeff Mahoney void __user *arg) 3356475f6387SJan Schmidt { 3357475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3358475f6387SJan Schmidt struct btrfs_device *dev; 3359475f6387SJan Schmidt int ret = 0; 3360475f6387SJan Schmidt char *s_uuid = NULL; 3361475f6387SJan Schmidt 3362475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3363475f6387SJan Schmidt if (IS_ERR(di_args)) 3364475f6387SJan Schmidt return PTR_ERR(di_args); 3365475f6387SJan Schmidt 3366dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3367475f6387SJan Schmidt s_uuid = di_args->uuid; 3368475f6387SJan Schmidt 3369c5593ca3SDavid Sterba rcu_read_lock(); 3370e4319cd9SAnand Jain dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid, 3371b2598edfSAnand Jain NULL); 3372475f6387SJan Schmidt 3373475f6387SJan Schmidt if (!dev) { 3374475f6387SJan Schmidt ret = -ENODEV; 3375475f6387SJan Schmidt goto out; 3376475f6387SJan Schmidt } 3377475f6387SJan Schmidt 3378475f6387SJan Schmidt di_args->devid = dev->devid; 33797cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 33807cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3381475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3382a27202fbSJim Meyering if (dev->name) { 3383672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3384672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3385a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3386a27202fbSJim Meyering } else { 338799ba55adSStefan Behrens di_args->path[0] = '\0'; 3388a27202fbSJim Meyering } 3389475f6387SJan Schmidt 3390475f6387SJan Schmidt out: 3391c5593ca3SDavid Sterba rcu_read_unlock(); 3392475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3393475f6387SJan Schmidt ret = -EFAULT; 3394475f6387SJan Schmidt 3395475f6387SJan Schmidt kfree(di_args); 3396475f6387SJan Schmidt return ret; 3397475f6387SJan Schmidt } 3398475f6387SJan Schmidt 33996ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 34006ef5ed0dSJosef Bacik { 3401496ad9aaSAl Viro struct inode *inode = file_inode(file); 34020b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 34036ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 34046ef5ed0dSJosef Bacik struct btrfs_root *new_root; 34056ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 34066ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 34072a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 34086ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 34096ef5ed0dSJosef Bacik u64 objectid = 0; 34106ef5ed0dSJosef Bacik u64 dir_id; 34113c04ce01SMiao Xie int ret; 34126ef5ed0dSJosef Bacik 34136ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 34146ef5ed0dSJosef Bacik return -EPERM; 34156ef5ed0dSJosef Bacik 34163c04ce01SMiao Xie ret = mnt_want_write_file(file); 34173c04ce01SMiao Xie if (ret) 34183c04ce01SMiao Xie return ret; 34193c04ce01SMiao Xie 34203c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 34213c04ce01SMiao Xie ret = -EFAULT; 34223c04ce01SMiao Xie goto out; 34233c04ce01SMiao Xie } 34246ef5ed0dSJosef Bacik 34256ef5ed0dSJosef Bacik if (!objectid) 34261cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 34276ef5ed0dSJosef Bacik 342856e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 34293c04ce01SMiao Xie if (IS_ERR(new_root)) { 34303c04ce01SMiao Xie ret = PTR_ERR(new_root); 34313c04ce01SMiao Xie goto out; 34323c04ce01SMiao Xie } 34332a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 34342a2b5d62SJosef Bacik ret = -ENOENT; 34352a2b5d62SJosef Bacik goto out_free; 34362a2b5d62SJosef Bacik } 34376ef5ed0dSJosef Bacik 34386ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 34393c04ce01SMiao Xie if (!path) { 34403c04ce01SMiao Xie ret = -ENOMEM; 34412a2b5d62SJosef Bacik goto out_free; 34423c04ce01SMiao Xie } 34436ef5ed0dSJosef Bacik 34446ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 344598d5dc13STsutomu Itoh if (IS_ERR(trans)) { 34463c04ce01SMiao Xie ret = PTR_ERR(trans); 34472a2b5d62SJosef Bacik goto out_free; 34486ef5ed0dSJosef Bacik } 34496ef5ed0dSJosef Bacik 34500b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 34510b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 34526ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3453cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 34542a2b5d62SJosef Bacik btrfs_release_path(path); 34553a45bb20SJeff Mahoney btrfs_end_transaction(trans); 34560b246afaSJeff Mahoney btrfs_err(fs_info, 34575d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 34583c04ce01SMiao Xie ret = -ENOENT; 34592a2b5d62SJosef Bacik goto out_free; 34606ef5ed0dSJosef Bacik } 34616ef5ed0dSJosef Bacik 34626ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 34636ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 34646ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 34652a2b5d62SJosef Bacik btrfs_release_path(path); 34666ef5ed0dSJosef Bacik 34670b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 34683a45bb20SJeff Mahoney btrfs_end_transaction(trans); 34692a2b5d62SJosef Bacik out_free: 347000246528SJosef Bacik btrfs_put_root(new_root); 34712a2b5d62SJosef Bacik btrfs_free_path(path); 34723c04ce01SMiao Xie out: 34733c04ce01SMiao Xie mnt_drop_write_file(file); 34743c04ce01SMiao Xie return ret; 34756ef5ed0dSJosef Bacik } 34766ef5ed0dSJosef Bacik 3477c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3478bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3479bf5fc093SJosef Bacik { 348032da5386SDavid Sterba struct btrfs_block_group *block_group; 3481bf5fc093SJosef Bacik 3482bf5fc093SJosef Bacik space->total_bytes = 0; 3483bf5fc093SJosef Bacik space->used_bytes = 0; 3484bf5fc093SJosef Bacik space->flags = 0; 3485bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3486bf5fc093SJosef Bacik space->flags = block_group->flags; 3487b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3488bf38be65SDavid Sterba space->used_bytes += block_group->used; 3489bf5fc093SJosef Bacik } 3490bf5fc093SJosef Bacik } 3491bf5fc093SJosef Bacik 34922ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 34932ff7e61eSJeff Mahoney void __user *arg) 34941406e432SJosef Bacik { 34951406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 34961406e432SJosef Bacik struct btrfs_ioctl_space_info space; 34971406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 34987fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 349913f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 35001406e432SJosef Bacik struct btrfs_space_info *info; 3501315d8e98SColin Ian King static const u64 types[] = { 3502315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3503bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3504bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3505315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3506315d8e98SColin Ian King }; 3507bf5fc093SJosef Bacik int num_types = 4; 35087fde62bfSChris Mason int alloc_size; 35091406e432SJosef Bacik int ret = 0; 351051788b1bSDan Rosenberg u64 slot_count = 0; 3511bf5fc093SJosef Bacik int i, c; 35121406e432SJosef Bacik 35131406e432SJosef Bacik if (copy_from_user(&space_args, 35141406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 35151406e432SJosef Bacik sizeof(space_args))) 35161406e432SJosef Bacik return -EFAULT; 35171406e432SJosef Bacik 3518bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3519bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3520bf5fc093SJosef Bacik 3521bf5fc093SJosef Bacik info = NULL; 352272804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3523bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3524bf5fc093SJosef Bacik info = tmp; 3525bf5fc093SJosef Bacik break; 3526bf5fc093SJosef Bacik } 3527bf5fc093SJosef Bacik } 35281406e432SJosef Bacik 3529bf5fc093SJosef Bacik if (!info) 3530bf5fc093SJosef Bacik continue; 3531bf5fc093SJosef Bacik 3532bf5fc093SJosef Bacik down_read(&info->groups_sem); 3533bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3534bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3535bf5fc093SJosef Bacik slot_count++; 3536bf5fc093SJosef Bacik } 3537bf5fc093SJosef Bacik up_read(&info->groups_sem); 3538bf5fc093SJosef Bacik } 3539bf5fc093SJosef Bacik 354036523e95SDavid Sterba /* 354136523e95SDavid Sterba * Global block reserve, exported as a space_info 354236523e95SDavid Sterba */ 354336523e95SDavid Sterba slot_count++; 354436523e95SDavid Sterba 35457fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 35467fde62bfSChris Mason if (space_args.space_slots == 0) { 35477fde62bfSChris Mason space_args.total_spaces = slot_count; 35487fde62bfSChris Mason goto out; 35497fde62bfSChris Mason } 3550bf5fc093SJosef Bacik 355151788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3552bf5fc093SJosef Bacik 35537fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3554bf5fc093SJosef Bacik 35557fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 35567fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 35577fde62bfSChris Mason */ 355809cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 35597fde62bfSChris Mason return -ENOMEM; 35607fde62bfSChris Mason 35617fde62bfSChris Mason space_args.total_spaces = 0; 35628d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 35637fde62bfSChris Mason if (!dest) 35647fde62bfSChris Mason return -ENOMEM; 35657fde62bfSChris Mason dest_orig = dest; 35667fde62bfSChris Mason 35677fde62bfSChris Mason /* now we have a buffer to copy into */ 3568bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3569bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3570bf5fc093SJosef Bacik 357151788b1bSDan Rosenberg if (!slot_count) 357251788b1bSDan Rosenberg break; 357351788b1bSDan Rosenberg 3574bf5fc093SJosef Bacik info = NULL; 357572804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3576bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3577bf5fc093SJosef Bacik info = tmp; 35787fde62bfSChris Mason break; 3579bf5fc093SJosef Bacik } 3580bf5fc093SJosef Bacik } 35817fde62bfSChris Mason 3582bf5fc093SJosef Bacik if (!info) 3583bf5fc093SJosef Bacik continue; 3584bf5fc093SJosef Bacik down_read(&info->groups_sem); 3585bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3586bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3587c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3588c065f5b1SSu Yue &space); 35897fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 35901406e432SJosef Bacik dest++; 35911406e432SJosef Bacik space_args.total_spaces++; 359251788b1bSDan Rosenberg slot_count--; 35931406e432SJosef Bacik } 359451788b1bSDan Rosenberg if (!slot_count) 359551788b1bSDan Rosenberg break; 3596bf5fc093SJosef Bacik } 3597bf5fc093SJosef Bacik up_read(&info->groups_sem); 3598bf5fc093SJosef Bacik } 35991406e432SJosef Bacik 360036523e95SDavid Sterba /* 360136523e95SDavid Sterba * Add global block reserve 360236523e95SDavid Sterba */ 360336523e95SDavid Sterba if (slot_count) { 36040b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 360536523e95SDavid Sterba 360636523e95SDavid Sterba spin_lock(&block_rsv->lock); 360736523e95SDavid Sterba space.total_bytes = block_rsv->size; 360836523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 360936523e95SDavid Sterba spin_unlock(&block_rsv->lock); 361036523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 361136523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 361236523e95SDavid Sterba space_args.total_spaces++; 361336523e95SDavid Sterba } 361436523e95SDavid Sterba 36152eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 36167fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 36177fde62bfSChris Mason 36187fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 36197fde62bfSChris Mason ret = -EFAULT; 36207fde62bfSChris Mason 36217fde62bfSChris Mason kfree(dest_orig); 36227fde62bfSChris Mason out: 36237fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 36241406e432SJosef Bacik ret = -EFAULT; 36251406e432SJosef Bacik 36261406e432SJosef Bacik return ret; 36271406e432SJosef Bacik } 36281406e432SJosef Bacik 36299a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 36309a8c28beSMiao Xie void __user *argp) 363146204592SSage Weil { 363246204592SSage Weil struct btrfs_trans_handle *trans; 363346204592SSage Weil u64 transid; 3634db5b493aSTsutomu Itoh int ret; 363546204592SSage Weil 3636d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3637ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3638ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 363998d5dc13STsutomu Itoh return PTR_ERR(trans); 3640ff7c1d33SMiao Xie 3641ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3642ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3643ff7c1d33SMiao Xie goto out; 3644ff7c1d33SMiao Xie } 364546204592SSage Weil transid = trans->transid; 36463a45bb20SJeff Mahoney ret = btrfs_commit_transaction_async(trans, 0); 36478b2b2d3cSTsutomu Itoh if (ret) { 36483a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3649db5b493aSTsutomu Itoh return ret; 36508b2b2d3cSTsutomu Itoh } 3651ff7c1d33SMiao Xie out: 365246204592SSage Weil if (argp) 365346204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 365446204592SSage Weil return -EFAULT; 365546204592SSage Weil return 0; 365646204592SSage Weil } 365746204592SSage Weil 36582ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 36599a8c28beSMiao Xie void __user *argp) 366046204592SSage Weil { 366146204592SSage Weil u64 transid; 366246204592SSage Weil 366346204592SSage Weil if (argp) { 366446204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 366546204592SSage Weil return -EFAULT; 366646204592SSage Weil } else { 366746204592SSage Weil transid = 0; /* current trans */ 366846204592SSage Weil } 36692ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 367046204592SSage Weil } 367146204592SSage Weil 3672b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3673475f6387SJan Schmidt { 36740b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3675475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3676b8e95489SMiao Xie int ret; 3677475f6387SJan Schmidt 3678475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3679475f6387SJan Schmidt return -EPERM; 3680475f6387SJan Schmidt 3681475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3682475f6387SJan Schmidt if (IS_ERR(sa)) 3683475f6387SJan Schmidt return PTR_ERR(sa); 3684475f6387SJan Schmidt 3685b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3686b8e95489SMiao Xie ret = mnt_want_write_file(file); 3687b8e95489SMiao Xie if (ret) 3688b8e95489SMiao Xie goto out; 3689b8e95489SMiao Xie } 3690b8e95489SMiao Xie 36910b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 369263a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 369363a212abSStefan Behrens 0); 3694475f6387SJan Schmidt 36955afe6ce7SFilipe Manana /* 36965afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 36975afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 36985afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 36995afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 37005afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 37015afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 37025afe6ce7SFilipe Manana * previously (btrfs-progs does this). 37035afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 37045afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 37055afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 37065afe6ce7SFilipe Manana */ 37075afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3708475f6387SJan Schmidt ret = -EFAULT; 3709475f6387SJan Schmidt 3710b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3711b8e95489SMiao Xie mnt_drop_write_file(file); 3712b8e95489SMiao Xie out: 3713475f6387SJan Schmidt kfree(sa); 3714475f6387SJan Schmidt return ret; 3715475f6387SJan Schmidt } 3716475f6387SJan Schmidt 37172ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3718475f6387SJan Schmidt { 3719475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3720475f6387SJan Schmidt return -EPERM; 3721475f6387SJan Schmidt 37222ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3723475f6387SJan Schmidt } 3724475f6387SJan Schmidt 37252ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3726475f6387SJan Schmidt void __user *arg) 3727475f6387SJan Schmidt { 3728475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3729475f6387SJan Schmidt int ret; 3730475f6387SJan Schmidt 3731475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3732475f6387SJan Schmidt return -EPERM; 3733475f6387SJan Schmidt 3734475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3735475f6387SJan Schmidt if (IS_ERR(sa)) 3736475f6387SJan Schmidt return PTR_ERR(sa); 3737475f6387SJan Schmidt 37382ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3739475f6387SJan Schmidt 37404fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3741475f6387SJan Schmidt ret = -EFAULT; 3742475f6387SJan Schmidt 3743475f6387SJan Schmidt kfree(sa); 3744475f6387SJan Schmidt return ret; 3745475f6387SJan Schmidt } 3746475f6387SJan Schmidt 37472ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3748b27f7c0cSDavid Sterba void __user *arg) 3749c11d2c23SStefan Behrens { 3750c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3751c11d2c23SStefan Behrens int ret; 3752c11d2c23SStefan Behrens 3753c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3754c11d2c23SStefan Behrens if (IS_ERR(sa)) 3755c11d2c23SStefan Behrens return PTR_ERR(sa); 3756c11d2c23SStefan Behrens 3757b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3758b27f7c0cSDavid Sterba kfree(sa); 3759b27f7c0cSDavid Sterba return -EPERM; 3760b27f7c0cSDavid Sterba } 3761b27f7c0cSDavid Sterba 37622ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3763c11d2c23SStefan Behrens 3764eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3765c11d2c23SStefan Behrens ret = -EFAULT; 3766c11d2c23SStefan Behrens 3767c11d2c23SStefan Behrens kfree(sa); 3768c11d2c23SStefan Behrens return ret; 3769c11d2c23SStefan Behrens } 3770c11d2c23SStefan Behrens 37712ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 37722ff7e61eSJeff Mahoney void __user *arg) 37733f6bcfbdSStefan Behrens { 37743f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 37753f6bcfbdSStefan Behrens int ret; 37763f6bcfbdSStefan Behrens 37773f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 37783f6bcfbdSStefan Behrens return -EPERM; 37793f6bcfbdSStefan Behrens 37803f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 37813f6bcfbdSStefan Behrens if (IS_ERR(p)) 37823f6bcfbdSStefan Behrens return PTR_ERR(p); 37833f6bcfbdSStefan Behrens 37843f6bcfbdSStefan Behrens switch (p->cmd) { 37853f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3786bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3787adfa97cbSIlya Dryomov ret = -EROFS; 3788adfa97cbSIlya Dryomov goto out; 3789adfa97cbSIlya Dryomov } 3790c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 3791e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 37923f6bcfbdSStefan Behrens } else { 37932ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3794c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 37953f6bcfbdSStefan Behrens } 37963f6bcfbdSStefan Behrens break; 37973f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 37980b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 37993f6bcfbdSStefan Behrens ret = 0; 38003f6bcfbdSStefan Behrens break; 38013f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 380217d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 380397282031SAnand Jain ret = 0; 38043f6bcfbdSStefan Behrens break; 38053f6bcfbdSStefan Behrens default: 38063f6bcfbdSStefan Behrens ret = -EINVAL; 38073f6bcfbdSStefan Behrens break; 38083f6bcfbdSStefan Behrens } 38093f6bcfbdSStefan Behrens 3810d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 38113f6bcfbdSStefan Behrens ret = -EFAULT; 3812adfa97cbSIlya Dryomov out: 38133f6bcfbdSStefan Behrens kfree(p); 38143f6bcfbdSStefan Behrens return ret; 38153f6bcfbdSStefan Behrens } 38163f6bcfbdSStefan Behrens 3817d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3818d7728c96SJan Schmidt { 3819d7728c96SJan Schmidt int ret = 0; 3820d7728c96SJan Schmidt int i; 3821740c3d22SChris Mason u64 rel_ptr; 3822d7728c96SJan Schmidt int size; 3823806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3824d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3825d7728c96SJan Schmidt struct btrfs_path *path; 3826d7728c96SJan Schmidt 382782b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3828d7728c96SJan Schmidt return -EPERM; 3829d7728c96SJan Schmidt 3830d7728c96SJan Schmidt path = btrfs_alloc_path(); 3831d7728c96SJan Schmidt if (!path) { 3832d7728c96SJan Schmidt ret = -ENOMEM; 3833d7728c96SJan Schmidt goto out; 3834d7728c96SJan Schmidt } 3835d7728c96SJan Schmidt 3836d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3837d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3838d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3839d7728c96SJan Schmidt ipa = NULL; 3840d7728c96SJan Schmidt goto out; 3841d7728c96SJan Schmidt } 3842d7728c96SJan Schmidt 3843d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3844d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3845d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3846d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3847d7728c96SJan Schmidt ipath = NULL; 3848d7728c96SJan Schmidt goto out; 3849d7728c96SJan Schmidt } 3850d7728c96SJan Schmidt 3851d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3852d7728c96SJan Schmidt if (ret < 0) 3853d7728c96SJan Schmidt goto out; 3854d7728c96SJan Schmidt 3855d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3856745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3857745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3858740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3859d7728c96SJan Schmidt } 3860d7728c96SJan Schmidt 3861718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3862718dc5faSOmar Sandoval ipath->fspath, size); 3863d7728c96SJan Schmidt if (ret) { 3864d7728c96SJan Schmidt ret = -EFAULT; 3865d7728c96SJan Schmidt goto out; 3866d7728c96SJan Schmidt } 3867d7728c96SJan Schmidt 3868d7728c96SJan Schmidt out: 3869d7728c96SJan Schmidt btrfs_free_path(path); 3870d7728c96SJan Schmidt free_ipath(ipath); 3871d7728c96SJan Schmidt kfree(ipa); 3872d7728c96SJan Schmidt 3873d7728c96SJan Schmidt return ret; 3874d7728c96SJan Schmidt } 3875d7728c96SJan Schmidt 3876d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3877d7728c96SJan Schmidt { 3878d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3879d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3880d7728c96SJan Schmidt 3881d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3882d7728c96SJan Schmidt inodes->bytes_left -= c; 3883d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3884d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3885d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3886d7728c96SJan Schmidt inodes->elem_cnt += 3; 3887d7728c96SJan Schmidt } else { 3888d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3889d7728c96SJan Schmidt inodes->bytes_left = 0; 3890d7728c96SJan Schmidt inodes->elem_missed += 3; 3891d7728c96SJan Schmidt } 3892d7728c96SJan Schmidt 3893d7728c96SJan Schmidt return 0; 3894d7728c96SJan Schmidt } 3895d7728c96SJan Schmidt 38962ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3897d24a67b2SZygo Blaxell void __user *arg, int version) 3898d7728c96SJan Schmidt { 3899d7728c96SJan Schmidt int ret = 0; 3900d7728c96SJan Schmidt int size; 3901d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3902d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3903d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3904d24a67b2SZygo Blaxell bool ignore_offset; 3905d7728c96SJan Schmidt 3906d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3907d7728c96SJan Schmidt return -EPERM; 3908d7728c96SJan Schmidt 3909d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 39107b9ea627SShailendra Verma if (IS_ERR(loi)) 39117b9ea627SShailendra Verma return PTR_ERR(loi); 3912d7728c96SJan Schmidt 3913d24a67b2SZygo Blaxell if (version == 1) { 3914d24a67b2SZygo Blaxell ignore_offset = false; 3915b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 3916d24a67b2SZygo Blaxell } else { 3917d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 3918d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 3919d24a67b2SZygo Blaxell ret = -EINVAL; 3920d24a67b2SZygo Blaxell goto out_loi; 3921d24a67b2SZygo Blaxell } 3922d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 3923d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 3924d24a67b2SZygo Blaxell ret = -EINVAL; 3925d24a67b2SZygo Blaxell goto out_loi; 3926d24a67b2SZygo Blaxell } 3927d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 3928b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 3929d24a67b2SZygo Blaxell } 3930d24a67b2SZygo Blaxell 3931d7728c96SJan Schmidt path = btrfs_alloc_path(); 3932d7728c96SJan Schmidt if (!path) { 3933d7728c96SJan Schmidt ret = -ENOMEM; 3934d7728c96SJan Schmidt goto out; 3935d7728c96SJan Schmidt } 3936d7728c96SJan Schmidt 3937d7728c96SJan Schmidt inodes = init_data_container(size); 3938d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3939d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3940d7728c96SJan Schmidt inodes = NULL; 3941d7728c96SJan Schmidt goto out; 3942d7728c96SJan Schmidt } 3943d7728c96SJan Schmidt 39442ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 3945d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 3946df031f07SLiu Bo if (ret == -EINVAL) 3947d7728c96SJan Schmidt ret = -ENOENT; 3948d7728c96SJan Schmidt if (ret < 0) 3949d7728c96SJan Schmidt goto out; 3950d7728c96SJan Schmidt 3951718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 3952718dc5faSOmar Sandoval size); 3953d7728c96SJan Schmidt if (ret) 3954d7728c96SJan Schmidt ret = -EFAULT; 3955d7728c96SJan Schmidt 3956d7728c96SJan Schmidt out: 3957d7728c96SJan Schmidt btrfs_free_path(path); 3958f54de068SDavid Sterba kvfree(inodes); 3959d24a67b2SZygo Blaxell out_loi: 3960d7728c96SJan Schmidt kfree(loi); 3961d7728c96SJan Schmidt 3962d7728c96SJan Schmidt return ret; 3963d7728c96SJan Schmidt } 3964d7728c96SJan Schmidt 3965008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 3966c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3967c9e9f97bSIlya Dryomov { 3968c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3969c9e9f97bSIlya Dryomov 3970c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3971c9e9f97bSIlya Dryomov 39723009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 3973837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3974837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3975837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3976a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3977a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3978837d5b6eSIlya Dryomov 3979c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3980c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3981c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 398219a39dceSIlya Dryomov 398319a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 398419a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 398519a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 3986c9e9f97bSIlya Dryomov } 3987c9e9f97bSIlya Dryomov 39889ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3989c9e9f97bSIlya Dryomov { 3990496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3991c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3992c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3993c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3994ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 3995c9e9f97bSIlya Dryomov int ret; 3996c9e9f97bSIlya Dryomov 3997c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3998c9e9f97bSIlya Dryomov return -EPERM; 3999c9e9f97bSIlya Dryomov 4000e54bfa31SLiu Bo ret = mnt_want_write_file(file); 40019ba1f6e4SLiu Bo if (ret) 40029ba1f6e4SLiu Bo return ret; 40039ba1f6e4SLiu Bo 4004ed0fb78fSIlya Dryomov again: 4005c3e1f96cSGoldwyn Rodrigues if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 4006c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4007ed0fb78fSIlya Dryomov need_unlock = true; 4008ed0fb78fSIlya Dryomov goto locked; 4009ed0fb78fSIlya Dryomov } 4010ed0fb78fSIlya Dryomov 4011ed0fb78fSIlya Dryomov /* 401201327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 4013ed0fb78fSIlya Dryomov * (1) some other op is running 4014ed0fb78fSIlya Dryomov * (2) balance is running 4015ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4016ed0fb78fSIlya Dryomov */ 4017ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4018ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4019ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 40203009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4021ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4022dccdb07bSDavid Sterba /* 4023dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 4024dccdb07bSDavid Sterba * we'll reexamine the status again. 4025dccdb07bSDavid Sterba */ 4026ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4027ed0fb78fSIlya Dryomov 4028ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 40293009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4030ed0fb78fSIlya Dryomov /* this is (3) */ 4031ed0fb78fSIlya Dryomov need_unlock = false; 4032ed0fb78fSIlya Dryomov goto locked; 4033ed0fb78fSIlya Dryomov } 4034ed0fb78fSIlya Dryomov 4035ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4036ed0fb78fSIlya Dryomov goto again; 4037ed0fb78fSIlya Dryomov } else { 4038ed0fb78fSIlya Dryomov /* this is (2) */ 4039ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4040ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4041ed0fb78fSIlya Dryomov goto out; 4042ed0fb78fSIlya Dryomov } 4043ed0fb78fSIlya Dryomov } else { 4044ed0fb78fSIlya Dryomov /* this is (1) */ 4045ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4046e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4047ed0fb78fSIlya Dryomov goto out; 4048ed0fb78fSIlya Dryomov } 4049ed0fb78fSIlya Dryomov 4050ed0fb78fSIlya Dryomov locked: 4051c9e9f97bSIlya Dryomov 4052c9e9f97bSIlya Dryomov if (arg) { 4053c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4054c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4055c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4056ed0fb78fSIlya Dryomov goto out_unlock; 4057c9e9f97bSIlya Dryomov } 4058de322263SIlya Dryomov 4059de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4060de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4061de322263SIlya Dryomov ret = -ENOTCONN; 4062de322263SIlya Dryomov goto out_bargs; 4063de322263SIlya Dryomov } 4064de322263SIlya Dryomov 4065de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4066de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4067de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4068de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4069de322263SIlya Dryomov 4070de322263SIlya Dryomov goto do_balance; 4071de322263SIlya Dryomov } 4072c9e9f97bSIlya Dryomov } else { 4073c9e9f97bSIlya Dryomov bargs = NULL; 4074c9e9f97bSIlya Dryomov } 4075c9e9f97bSIlya Dryomov 4076ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4077837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4078837d5b6eSIlya Dryomov goto out_bargs; 4079837d5b6eSIlya Dryomov } 4080837d5b6eSIlya Dryomov 40818d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4082c9e9f97bSIlya Dryomov if (!bctl) { 4083c9e9f97bSIlya Dryomov ret = -ENOMEM; 4084c9e9f97bSIlya Dryomov goto out_bargs; 4085c9e9f97bSIlya Dryomov } 4086c9e9f97bSIlya Dryomov 4087c9e9f97bSIlya Dryomov if (arg) { 4088c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4089c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4090c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4091c9e9f97bSIlya Dryomov 4092c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4093f43ffb60SIlya Dryomov } else { 4094f43ffb60SIlya Dryomov /* balance everything - no filters */ 4095f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4096c9e9f97bSIlya Dryomov } 4097c9e9f97bSIlya Dryomov 40988eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 40998eb93459SDavid Sterba ret = -EINVAL; 41000f89abf5SChristian Engelmayer goto out_bctl; 41018eb93459SDavid Sterba } 41028eb93459SDavid Sterba 4103de322263SIlya Dryomov do_balance: 4104c9e9f97bSIlya Dryomov /* 4105c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 4106c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 4107c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 4108c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 4109c9e9f97bSIlya Dryomov */ 4110ed0fb78fSIlya Dryomov need_unlock = false; 4111ed0fb78fSIlya Dryomov 41126fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 41130f89abf5SChristian Engelmayer bctl = NULL; 4114ed0fb78fSIlya Dryomov 4115d00c2d9cSFilipe Manana if ((ret == 0 || ret == -ECANCELED) && arg) { 4116c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4117c9e9f97bSIlya Dryomov ret = -EFAULT; 4118c9e9f97bSIlya Dryomov } 4119c9e9f97bSIlya Dryomov 41200f89abf5SChristian Engelmayer out_bctl: 41210f89abf5SChristian Engelmayer kfree(bctl); 4122c9e9f97bSIlya Dryomov out_bargs: 4123c9e9f97bSIlya Dryomov kfree(bargs); 4124ed0fb78fSIlya Dryomov out_unlock: 4125c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4126ed0fb78fSIlya Dryomov if (need_unlock) 4127c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 4128ed0fb78fSIlya Dryomov out: 4129e54bfa31SLiu Bo mnt_drop_write_file(file); 4130c9e9f97bSIlya Dryomov return ret; 4131c9e9f97bSIlya Dryomov } 4132c9e9f97bSIlya Dryomov 41332ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4134837d5b6eSIlya Dryomov { 4135837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4136837d5b6eSIlya Dryomov return -EPERM; 4137837d5b6eSIlya Dryomov 4138837d5b6eSIlya Dryomov switch (cmd) { 4139837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 41400b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4141a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 41420b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4143837d5b6eSIlya Dryomov } 4144837d5b6eSIlya Dryomov 4145837d5b6eSIlya Dryomov return -EINVAL; 4146837d5b6eSIlya Dryomov } 4147837d5b6eSIlya Dryomov 41482ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 414919a39dceSIlya Dryomov void __user *arg) 415019a39dceSIlya Dryomov { 415119a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 415219a39dceSIlya Dryomov int ret = 0; 415319a39dceSIlya Dryomov 415419a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 415519a39dceSIlya Dryomov return -EPERM; 415619a39dceSIlya Dryomov 415719a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 415819a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 415919a39dceSIlya Dryomov ret = -ENOTCONN; 416019a39dceSIlya Dryomov goto out; 416119a39dceSIlya Dryomov } 416219a39dceSIlya Dryomov 41638d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 416419a39dceSIlya Dryomov if (!bargs) { 416519a39dceSIlya Dryomov ret = -ENOMEM; 416619a39dceSIlya Dryomov goto out; 416719a39dceSIlya Dryomov } 416819a39dceSIlya Dryomov 4169008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 417019a39dceSIlya Dryomov 417119a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 417219a39dceSIlya Dryomov ret = -EFAULT; 417319a39dceSIlya Dryomov 417419a39dceSIlya Dryomov kfree(bargs); 417519a39dceSIlya Dryomov out: 417619a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 417719a39dceSIlya Dryomov return ret; 417819a39dceSIlya Dryomov } 417919a39dceSIlya Dryomov 4180905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 41815d13a37bSArne Jansen { 41820b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41830b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41845d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 41855d13a37bSArne Jansen int ret; 41865d13a37bSArne Jansen 41875d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41885d13a37bSArne Jansen return -EPERM; 41895d13a37bSArne Jansen 4190905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4191905b0ddaSMiao Xie if (ret) 4192905b0ddaSMiao Xie return ret; 41935d13a37bSArne Jansen 41945d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4195905b0ddaSMiao Xie if (IS_ERR(sa)) { 4196905b0ddaSMiao Xie ret = PTR_ERR(sa); 4197905b0ddaSMiao Xie goto drop_write; 4198905b0ddaSMiao Xie } 41995d13a37bSArne Jansen 42000b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 42015d13a37bSArne Jansen 42025d13a37bSArne Jansen switch (sa->cmd) { 42035d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4204340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 42055d13a37bSArne Jansen break; 42065d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4207340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 42085d13a37bSArne Jansen break; 42095d13a37bSArne Jansen default: 42105d13a37bSArne Jansen ret = -EINVAL; 42115d13a37bSArne Jansen break; 42125d13a37bSArne Jansen } 42135d13a37bSArne Jansen 42145d13a37bSArne Jansen kfree(sa); 42150b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4216905b0ddaSMiao Xie drop_write: 4217905b0ddaSMiao Xie mnt_drop_write_file(file); 42185d13a37bSArne Jansen return ret; 42195d13a37bSArne Jansen } 42205d13a37bSArne Jansen 4221905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 42225d13a37bSArne Jansen { 42230b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42240b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42250b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42265d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 42275d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42285d13a37bSArne Jansen int ret; 42295d13a37bSArne Jansen int err; 42305d13a37bSArne Jansen 42315d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42325d13a37bSArne Jansen return -EPERM; 42335d13a37bSArne Jansen 4234905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4235905b0ddaSMiao Xie if (ret) 4236905b0ddaSMiao Xie return ret; 42375d13a37bSArne Jansen 42385d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4239905b0ddaSMiao Xie if (IS_ERR(sa)) { 4240905b0ddaSMiao Xie ret = PTR_ERR(sa); 4241905b0ddaSMiao Xie goto drop_write; 4242905b0ddaSMiao Xie } 42435d13a37bSArne Jansen 42445d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42455d13a37bSArne Jansen if (IS_ERR(trans)) { 42465d13a37bSArne Jansen ret = PTR_ERR(trans); 42475d13a37bSArne Jansen goto out; 42485d13a37bSArne Jansen } 42495d13a37bSArne Jansen 42505d13a37bSArne Jansen if (sa->assign) { 42519f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 42525d13a37bSArne Jansen } else { 425339616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 42545d13a37bSArne Jansen } 42555d13a37bSArne Jansen 4256e082f563SQu Wenruo /* update qgroup status and info */ 4257280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4258e082f563SQu Wenruo if (err < 0) 42590b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4260ad8403dfSAnand Jain "failed to update qgroup status and info"); 42613a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 42625d13a37bSArne Jansen if (err && !ret) 42635d13a37bSArne Jansen ret = err; 42645d13a37bSArne Jansen 42655d13a37bSArne Jansen out: 42665d13a37bSArne Jansen kfree(sa); 4267905b0ddaSMiao Xie drop_write: 4268905b0ddaSMiao Xie mnt_drop_write_file(file); 42695d13a37bSArne Jansen return ret; 42705d13a37bSArne Jansen } 42715d13a37bSArne Jansen 4272905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 42735d13a37bSArne Jansen { 42740b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42750b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42765d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 42775d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42785d13a37bSArne Jansen int ret; 42795d13a37bSArne Jansen int err; 42805d13a37bSArne Jansen 42815d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42825d13a37bSArne Jansen return -EPERM; 42835d13a37bSArne Jansen 4284905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4285905b0ddaSMiao Xie if (ret) 4286905b0ddaSMiao Xie return ret; 42875d13a37bSArne Jansen 42885d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4289905b0ddaSMiao Xie if (IS_ERR(sa)) { 4290905b0ddaSMiao Xie ret = PTR_ERR(sa); 4291905b0ddaSMiao Xie goto drop_write; 4292905b0ddaSMiao Xie } 42935d13a37bSArne Jansen 4294d86e56cfSMiao Xie if (!sa->qgroupid) { 4295d86e56cfSMiao Xie ret = -EINVAL; 4296d86e56cfSMiao Xie goto out; 4297d86e56cfSMiao Xie } 4298d86e56cfSMiao Xie 42995d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43005d13a37bSArne Jansen if (IS_ERR(trans)) { 43015d13a37bSArne Jansen ret = PTR_ERR(trans); 43025d13a37bSArne Jansen goto out; 43035d13a37bSArne Jansen } 43045d13a37bSArne Jansen 43055d13a37bSArne Jansen if (sa->create) { 430649a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 43075d13a37bSArne Jansen } else { 43083efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 43095d13a37bSArne Jansen } 43105d13a37bSArne Jansen 43113a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 43125d13a37bSArne Jansen if (err && !ret) 43135d13a37bSArne Jansen ret = err; 43145d13a37bSArne Jansen 43155d13a37bSArne Jansen out: 43165d13a37bSArne Jansen kfree(sa); 4317905b0ddaSMiao Xie drop_write: 4318905b0ddaSMiao Xie mnt_drop_write_file(file); 43195d13a37bSArne Jansen return ret; 43205d13a37bSArne Jansen } 43215d13a37bSArne Jansen 4322905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 43235d13a37bSArne Jansen { 43240b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43250b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 43265d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 43275d13a37bSArne Jansen struct btrfs_trans_handle *trans; 43285d13a37bSArne Jansen int ret; 43295d13a37bSArne Jansen int err; 43305d13a37bSArne Jansen u64 qgroupid; 43315d13a37bSArne Jansen 43325d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 43335d13a37bSArne Jansen return -EPERM; 43345d13a37bSArne Jansen 4335905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4336905b0ddaSMiao Xie if (ret) 4337905b0ddaSMiao Xie return ret; 43385d13a37bSArne Jansen 43395d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4340905b0ddaSMiao Xie if (IS_ERR(sa)) { 4341905b0ddaSMiao Xie ret = PTR_ERR(sa); 4342905b0ddaSMiao Xie goto drop_write; 4343905b0ddaSMiao Xie } 43445d13a37bSArne Jansen 43455d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43465d13a37bSArne Jansen if (IS_ERR(trans)) { 43475d13a37bSArne Jansen ret = PTR_ERR(trans); 43485d13a37bSArne Jansen goto out; 43495d13a37bSArne Jansen } 43505d13a37bSArne Jansen 43515d13a37bSArne Jansen qgroupid = sa->qgroupid; 43525d13a37bSArne Jansen if (!qgroupid) { 43535d13a37bSArne Jansen /* take the current subvol as qgroup */ 43545d13a37bSArne Jansen qgroupid = root->root_key.objectid; 43555d13a37bSArne Jansen } 43565d13a37bSArne Jansen 4357f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 43585d13a37bSArne Jansen 43593a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 43605d13a37bSArne Jansen if (err && !ret) 43615d13a37bSArne Jansen ret = err; 43625d13a37bSArne Jansen 43635d13a37bSArne Jansen out: 43645d13a37bSArne Jansen kfree(sa); 4365905b0ddaSMiao Xie drop_write: 4366905b0ddaSMiao Xie mnt_drop_write_file(file); 43675d13a37bSArne Jansen return ret; 43685d13a37bSArne Jansen } 43695d13a37bSArne Jansen 43702f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 43712f232036SJan Schmidt { 43720b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43730b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 43742f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 43752f232036SJan Schmidt int ret; 43762f232036SJan Schmidt 43772f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 43782f232036SJan Schmidt return -EPERM; 43792f232036SJan Schmidt 43802f232036SJan Schmidt ret = mnt_want_write_file(file); 43812f232036SJan Schmidt if (ret) 43822f232036SJan Schmidt return ret; 43832f232036SJan Schmidt 43842f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 43852f232036SJan Schmidt if (IS_ERR(qsa)) { 43862f232036SJan Schmidt ret = PTR_ERR(qsa); 43872f232036SJan Schmidt goto drop_write; 43882f232036SJan Schmidt } 43892f232036SJan Schmidt 43902f232036SJan Schmidt if (qsa->flags) { 43912f232036SJan Schmidt ret = -EINVAL; 43922f232036SJan Schmidt goto out; 43932f232036SJan Schmidt } 43942f232036SJan Schmidt 43950b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 43962f232036SJan Schmidt 43972f232036SJan Schmidt out: 43982f232036SJan Schmidt kfree(qsa); 43992f232036SJan Schmidt drop_write: 44002f232036SJan Schmidt mnt_drop_write_file(file); 44012f232036SJan Schmidt return ret; 44022f232036SJan Schmidt } 44032f232036SJan Schmidt 4404b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4405b929c1d8SMarcos Paulo de Souza void __user *arg) 44062f232036SJan Schmidt { 44072f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 44082f232036SJan Schmidt int ret = 0; 44092f232036SJan Schmidt 44102f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 44112f232036SJan Schmidt return -EPERM; 44122f232036SJan Schmidt 44138d2db785SDavid Sterba qsa = kzalloc(sizeof(*qsa), GFP_KERNEL); 44142f232036SJan Schmidt if (!qsa) 44152f232036SJan Schmidt return -ENOMEM; 44162f232036SJan Schmidt 44170b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 44182f232036SJan Schmidt qsa->flags = 1; 44190b246afaSJeff Mahoney qsa->progress = fs_info->qgroup_rescan_progress.objectid; 44202f232036SJan Schmidt } 44212f232036SJan Schmidt 44222f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 44232f232036SJan Schmidt ret = -EFAULT; 44242f232036SJan Schmidt 44252f232036SJan Schmidt kfree(qsa); 44262f232036SJan Schmidt return ret; 44272f232036SJan Schmidt } 44282f232036SJan Schmidt 4429b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4430b929c1d8SMarcos Paulo de Souza void __user *arg) 443157254b6eSJan Schmidt { 443257254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 443357254b6eSJan Schmidt return -EPERM; 443457254b6eSJan Schmidt 44350b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 443657254b6eSJan Schmidt } 443757254b6eSJan Schmidt 4438abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4439abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 44408ea05e3aSAlexander Block { 4441496ad9aaSAl Viro struct inode *inode = file_inode(file); 44420b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 44438ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 44448ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 44458ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 444695582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 44478ea05e3aSAlexander Block int ret = 0; 4448dd5f9615SStefan Behrens int received_uuid_changed; 44498ea05e3aSAlexander Block 445021cb47beSChristian Brauner if (!inode_owner_or_capable(&init_user_ns, inode)) 4451bd60ea0fSDavid Sterba return -EPERM; 4452bd60ea0fSDavid Sterba 44538ea05e3aSAlexander Block ret = mnt_want_write_file(file); 44548ea05e3aSAlexander Block if (ret < 0) 44558ea05e3aSAlexander Block return ret; 44568ea05e3aSAlexander Block 44570b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 44588ea05e3aSAlexander Block 44594a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 44608ea05e3aSAlexander Block ret = -EINVAL; 44618ea05e3aSAlexander Block goto out; 44628ea05e3aSAlexander Block } 44638ea05e3aSAlexander Block 44648ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 44658ea05e3aSAlexander Block ret = -EROFS; 44668ea05e3aSAlexander Block goto out; 44678ea05e3aSAlexander Block } 44688ea05e3aSAlexander Block 4469dd5f9615SStefan Behrens /* 4470dd5f9615SStefan Behrens * 1 - root item 4471dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4472dd5f9615SStefan Behrens */ 4473dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 44748ea05e3aSAlexander Block if (IS_ERR(trans)) { 44758ea05e3aSAlexander Block ret = PTR_ERR(trans); 44768ea05e3aSAlexander Block trans = NULL; 44778ea05e3aSAlexander Block goto out; 44788ea05e3aSAlexander Block } 44798ea05e3aSAlexander Block 44808ea05e3aSAlexander Block sa->rtransid = trans->transid; 44818ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 44828ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 44838ea05e3aSAlexander Block 4484dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4485dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4486dd5f9615SStefan Behrens if (received_uuid_changed && 4487d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4488d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4489dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4490dd5f9615SStefan Behrens root->root_key.objectid); 4491d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4492d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4493d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4494d87ff758SNikolay Borisov goto out; 4495d87ff758SNikolay Borisov } 4496d87ff758SNikolay Borisov } 44978ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 44988ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 44998ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 45003cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 45013cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 45023cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 45033cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 45048ea05e3aSAlexander Block 45050b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 45068ea05e3aSAlexander Block &root->root_key, &root->root_item); 45078ea05e3aSAlexander Block if (ret < 0) { 45083a45bb20SJeff Mahoney btrfs_end_transaction(trans); 45098ea05e3aSAlexander Block goto out; 4510dd5f9615SStefan Behrens } 4511dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4512cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4513dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4514dd5f9615SStefan Behrens root->root_key.objectid); 4515dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 451666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4517efd38150SNikolay Borisov btrfs_end_transaction(trans); 4518dd5f9615SStefan Behrens goto out; 4519dd5f9615SStefan Behrens } 4520dd5f9615SStefan Behrens } 45213a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4522abccd00fSHugo Mills out: 45230b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4524abccd00fSHugo Mills mnt_drop_write_file(file); 4525abccd00fSHugo Mills return ret; 4526abccd00fSHugo Mills } 4527abccd00fSHugo Mills 4528abccd00fSHugo Mills #ifdef CONFIG_64BIT 4529abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4530abccd00fSHugo Mills void __user *arg) 4531abccd00fSHugo Mills { 4532abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4533abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4534abccd00fSHugo Mills int ret = 0; 4535abccd00fSHugo Mills 4536abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 45377b9ea627SShailendra Verma if (IS_ERR(args32)) 45387b9ea627SShailendra Verma return PTR_ERR(args32); 4539abccd00fSHugo Mills 45408d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 454184dbeb87SDan Carpenter if (!args64) { 454284dbeb87SDan Carpenter ret = -ENOMEM; 4543abccd00fSHugo Mills goto out; 4544abccd00fSHugo Mills } 4545abccd00fSHugo Mills 4546abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4547abccd00fSHugo Mills args64->stransid = args32->stransid; 4548abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4549abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4550abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4551abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4552abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4553abccd00fSHugo Mills args64->flags = args32->flags; 4554abccd00fSHugo Mills 4555abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4556abccd00fSHugo Mills if (ret) 4557abccd00fSHugo Mills goto out; 4558abccd00fSHugo Mills 4559abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4560abccd00fSHugo Mills args32->stransid = args64->stransid; 4561abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4562abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4563abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4564abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4565abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4566abccd00fSHugo Mills args32->flags = args64->flags; 4567abccd00fSHugo Mills 4568abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4569abccd00fSHugo Mills if (ret) 4570abccd00fSHugo Mills ret = -EFAULT; 4571abccd00fSHugo Mills 4572abccd00fSHugo Mills out: 4573abccd00fSHugo Mills kfree(args32); 4574abccd00fSHugo Mills kfree(args64); 4575abccd00fSHugo Mills return ret; 4576abccd00fSHugo Mills } 4577abccd00fSHugo Mills #endif 4578abccd00fSHugo Mills 4579abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4580abccd00fSHugo Mills void __user *arg) 4581abccd00fSHugo Mills { 4582abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4583abccd00fSHugo Mills int ret = 0; 4584abccd00fSHugo Mills 4585abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 45867b9ea627SShailendra Verma if (IS_ERR(sa)) 45877b9ea627SShailendra Verma return PTR_ERR(sa); 4588abccd00fSHugo Mills 4589abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4590abccd00fSHugo Mills 4591abccd00fSHugo Mills if (ret) 4592abccd00fSHugo Mills goto out; 4593abccd00fSHugo Mills 45948ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 45958ea05e3aSAlexander Block if (ret) 45968ea05e3aSAlexander Block ret = -EFAULT; 45978ea05e3aSAlexander Block 45988ea05e3aSAlexander Block out: 45998ea05e3aSAlexander Block kfree(sa); 46008ea05e3aSAlexander Block return ret; 46018ea05e3aSAlexander Block } 46028ea05e3aSAlexander Block 4603b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4604b929c1d8SMarcos Paulo de Souza void __user *arg) 4605867ab667Sjeff.liu { 4606a1b83ac5SAnand Jain size_t len; 4607867ab667Sjeff.liu int ret; 4608a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4609a1b83ac5SAnand Jain 46100b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 46110b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 46120b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4613a1b83ac5SAnand Jain 4614a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4615867ab667Sjeff.liu 4616867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 46170b246afaSJeff Mahoney btrfs_warn(fs_info, 46180b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 46190b246afaSJeff Mahoney --len); 4620867ab667Sjeff.liu } 4621867ab667Sjeff.liu 4622867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4623867ab667Sjeff.liu 4624867ab667Sjeff.liu return ret ? -EFAULT : 0; 4625867ab667Sjeff.liu } 4626867ab667Sjeff.liu 4627a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4628a8bfd4abSjeff.liu { 46290b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46300b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 46310b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46320b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4633a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4634a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4635a8bfd4abSjeff.liu int ret; 4636a8bfd4abSjeff.liu 4637a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4638a8bfd4abSjeff.liu return -EPERM; 4639a8bfd4abSjeff.liu 4640a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4641a8bfd4abSjeff.liu return -EFAULT; 4642a8bfd4abSjeff.liu 4643a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 46440b246afaSJeff Mahoney btrfs_err(fs_info, 46455d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4646a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4647a8bfd4abSjeff.liu return -EINVAL; 4648a8bfd4abSjeff.liu } 4649a8bfd4abSjeff.liu 4650a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4651a8bfd4abSjeff.liu if (ret) 4652a8bfd4abSjeff.liu return ret; 4653a8bfd4abSjeff.liu 4654a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4655a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4656a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4657a8bfd4abSjeff.liu goto out_unlock; 4658a8bfd4abSjeff.liu } 4659a8bfd4abSjeff.liu 46600b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4661a8bfd4abSjeff.liu strcpy(super_block->label, label); 46620b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 46633a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4664a8bfd4abSjeff.liu 4665a8bfd4abSjeff.liu out_unlock: 4666a8bfd4abSjeff.liu mnt_drop_write_file(file); 4667a8bfd4abSjeff.liu return ret; 4668a8bfd4abSjeff.liu } 4669a8bfd4abSjeff.liu 46702eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 46712eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 46722eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 46732eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 46742eaa055fSJeff Mahoney 4675d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 46762eaa055fSJeff Mahoney { 46774d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 46782eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 46792eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 46802eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 46812eaa055fSJeff Mahoney }; 46822eaa055fSJeff Mahoney 46832eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 46842eaa055fSJeff Mahoney return -EFAULT; 46852eaa055fSJeff Mahoney 46862eaa055fSJeff Mahoney return 0; 46872eaa055fSJeff Mahoney } 46882eaa055fSJeff Mahoney 4689b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4690b929c1d8SMarcos Paulo de Souza void __user *arg) 46912eaa055fSJeff Mahoney { 46920b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 46932eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 46942eaa055fSJeff Mahoney 46952eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 46962eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 46972eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 46982eaa055fSJeff Mahoney 46992eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 47002eaa055fSJeff Mahoney return -EFAULT; 47012eaa055fSJeff Mahoney 47022eaa055fSJeff Mahoney return 0; 47032eaa055fSJeff Mahoney } 47042eaa055fSJeff Mahoney 47052ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 47063b02a68aSJeff Mahoney enum btrfs_feature_set set, 47072eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 47082eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 47092eaa055fSJeff Mahoney { 4710f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 47113b02a68aSJeff Mahoney char *names; 47122eaa055fSJeff Mahoney u64 disallowed, unsupported; 47132eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 47142eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 47152eaa055fSJeff Mahoney 47162eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 47172eaa055fSJeff Mahoney if (unsupported) { 47183b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 47193b02a68aSJeff Mahoney if (names) { 47200b246afaSJeff Mahoney btrfs_warn(fs_info, 47213b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 47223b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47233b02a68aSJeff Mahoney kfree(names); 47243b02a68aSJeff Mahoney } else 47250b246afaSJeff Mahoney btrfs_warn(fs_info, 47262eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 47272eaa055fSJeff Mahoney type, unsupported); 47282eaa055fSJeff Mahoney return -EOPNOTSUPP; 47292eaa055fSJeff Mahoney } 47302eaa055fSJeff Mahoney 47312eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 47322eaa055fSJeff Mahoney if (disallowed) { 47333b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47343b02a68aSJeff Mahoney if (names) { 47350b246afaSJeff Mahoney btrfs_warn(fs_info, 47363b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 47373b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47383b02a68aSJeff Mahoney kfree(names); 47393b02a68aSJeff Mahoney } else 47400b246afaSJeff Mahoney btrfs_warn(fs_info, 47412eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 47422eaa055fSJeff Mahoney type, disallowed); 47432eaa055fSJeff Mahoney return -EPERM; 47442eaa055fSJeff Mahoney } 47452eaa055fSJeff Mahoney 47462eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 47472eaa055fSJeff Mahoney if (disallowed) { 47483b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47493b02a68aSJeff Mahoney if (names) { 47500b246afaSJeff Mahoney btrfs_warn(fs_info, 47513b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 47523b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47533b02a68aSJeff Mahoney kfree(names); 47543b02a68aSJeff Mahoney } else 47550b246afaSJeff Mahoney btrfs_warn(fs_info, 47562eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 47572eaa055fSJeff Mahoney type, disallowed); 47582eaa055fSJeff Mahoney return -EPERM; 47592eaa055fSJeff Mahoney } 47602eaa055fSJeff Mahoney 47612eaa055fSJeff Mahoney return 0; 47622eaa055fSJeff Mahoney } 47632eaa055fSJeff Mahoney 47642ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 47652ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 47662eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 47672eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 47682eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 47692eaa055fSJeff Mahoney 47702eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 47712eaa055fSJeff Mahoney { 47720b246afaSJeff Mahoney struct inode *inode = file_inode(file); 47730b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 47740b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 47750b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 47762eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 47772eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 47782eaa055fSJeff Mahoney u64 newflags; 47792eaa055fSJeff Mahoney int ret; 47802eaa055fSJeff Mahoney 47812eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 47822eaa055fSJeff Mahoney return -EPERM; 47832eaa055fSJeff Mahoney 47842eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 47852eaa055fSJeff Mahoney return -EFAULT; 47862eaa055fSJeff Mahoney 47872eaa055fSJeff Mahoney /* Nothing to do */ 47882eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 47892eaa055fSJeff Mahoney !flags[0].incompat_flags) 47902eaa055fSJeff Mahoney return 0; 47912eaa055fSJeff Mahoney 47922ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 47932eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 47942eaa055fSJeff Mahoney if (ret) 47952eaa055fSJeff Mahoney return ret; 47962eaa055fSJeff Mahoney 47972ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 47982eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 47992eaa055fSJeff Mahoney if (ret) 48002eaa055fSJeff Mahoney return ret; 48012eaa055fSJeff Mahoney 48022ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 48032eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 48042eaa055fSJeff Mahoney if (ret) 48052eaa055fSJeff Mahoney return ret; 48062eaa055fSJeff Mahoney 48077ab19625SDavid Sterba ret = mnt_want_write_file(file); 48087ab19625SDavid Sterba if (ret) 48097ab19625SDavid Sterba return ret; 48107ab19625SDavid Sterba 48118051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 48127ab19625SDavid Sterba if (IS_ERR(trans)) { 48137ab19625SDavid Sterba ret = PTR_ERR(trans); 48147ab19625SDavid Sterba goto out_drop_write; 48157ab19625SDavid Sterba } 48162eaa055fSJeff Mahoney 48170b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 48182eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 48192eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 48202eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 48212eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 48222eaa055fSJeff Mahoney 48232eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 48242eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 48252eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 48262eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 48272eaa055fSJeff Mahoney 48282eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 48292eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 48302eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 48312eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 48320b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 48332eaa055fSJeff Mahoney 48343a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 48357ab19625SDavid Sterba out_drop_write: 48367ab19625SDavid Sterba mnt_drop_write_file(file); 48377ab19625SDavid Sterba 48387ab19625SDavid Sterba return ret; 48392eaa055fSJeff Mahoney } 48402eaa055fSJeff Mahoney 48412351f431SJosef Bacik static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) 48422351f431SJosef Bacik { 48432351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 48442351f431SJosef Bacik int ret; 48452351f431SJosef Bacik 48462351f431SJosef Bacik if (compat) { 48472351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 48482351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 48492351f431SJosef Bacik 48502351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 48512351f431SJosef Bacik if (ret) 48522351f431SJosef Bacik return -EFAULT; 48532351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 48542351f431SJosef Bacik if (!arg) 48552351f431SJosef Bacik return -ENOMEM; 48562351f431SJosef Bacik arg->send_fd = args32.send_fd; 48572351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 48582351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 48592351f431SJosef Bacik arg->parent_root = args32.parent_root; 48602351f431SJosef Bacik arg->flags = args32.flags; 48612351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 48622351f431SJosef Bacik sizeof(args32.reserved)); 48632351f431SJosef Bacik #else 48642351f431SJosef Bacik return -ENOTTY; 48652351f431SJosef Bacik #endif 48662351f431SJosef Bacik } else { 48672351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 48682351f431SJosef Bacik if (IS_ERR(arg)) 48692351f431SJosef Bacik return PTR_ERR(arg); 48702351f431SJosef Bacik } 48712351f431SJosef Bacik ret = btrfs_ioctl_send(file, arg); 48722351f431SJosef Bacik kfree(arg); 48732351f431SJosef Bacik return ret; 48742351f431SJosef Bacik } 48752351f431SJosef Bacik 4876f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4877f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4878f46b5a66SChristoph Hellwig { 48790b246afaSJeff Mahoney struct inode *inode = file_inode(file); 48800b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 48810b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 48824bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4883f46b5a66SChristoph Hellwig 4884f46b5a66SChristoph Hellwig switch (cmd) { 48856cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 48866cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 488740cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4888b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 488940cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 489040cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4891f7039b1dSLi Dongyang case FITRIM: 4892b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4893f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4894fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4895fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4896fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 48973de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4898fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 48996f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 49006f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 490176dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4902949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4903949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4904949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 49050caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 49060caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 49070caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 49080caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 49096ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 49106ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4911f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 49121e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 49131e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 49141e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4915f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4916198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4917f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 49182ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 4919f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4920da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 49216b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 49226b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 4923475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 49242ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 4925475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 49262ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 4927f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 49289ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4929ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4930ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4931cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 4932cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 4933ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4934ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4935d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4936d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4937d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4938d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 4939d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 4940d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 49411406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 49422ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 49439b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 49449b199859SFilipe David Borba Manana int ret; 49459b199859SFilipe David Borba Manana 49469db4dc24SNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 49479b199859SFilipe David Borba Manana if (ret) 49489b199859SFilipe David Borba Manana return ret; 49490b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 49502fad4e83SDavid Sterba /* 49512fad4e83SDavid Sterba * The transaction thread may want to do more work, 495201327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 49532fad4e83SDavid Sterba * processing uncleaned subvols. 49542fad4e83SDavid Sterba */ 49550b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 49569b199859SFilipe David Borba Manana return ret; 49579b199859SFilipe David Borba Manana } 495846204592SSage Weil case BTRFS_IOC_START_SYNC: 49599a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 496046204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 49612ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 4962475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4963b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4964475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 49652ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 4966475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 49672ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 4968c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 49699ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4970837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 49712ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 497219a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 49732ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 49748ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 49758ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 4976abccd00fSHugo Mills #ifdef CONFIG_64BIT 4977abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 4978abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 4979abccd00fSHugo Mills #endif 498031db9f7cSAlexander Block case BTRFS_IOC_SEND: 49812351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, false); 49822351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 49832351f431SJosef Bacik case BTRFS_IOC_SEND_32: 49842351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, true); 49852351f431SJosef Bacik #endif 4986c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 49872ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 49885d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4989905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 49905d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4991905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 49925d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4993905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 49945d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4995905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 49962f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 49972f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 49982f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 4999b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 500057254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 5001b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 50023f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 50032ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 50042eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 5005d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 50062eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 5007b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 50082eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 50092eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5010b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 5011b64ec075STomohiro Misono return btrfs_ioctl_get_subvol_info(file, argp); 501242e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 501342e4b520STomohiro Misono return btrfs_ioctl_get_subvol_rootref(file, argp); 501423d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 501523d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 5016f46b5a66SChristoph Hellwig } 5017f46b5a66SChristoph Hellwig 5018f46b5a66SChristoph Hellwig return -ENOTTY; 5019f46b5a66SChristoph Hellwig } 50204c63c245SLuke Dashjr 50214c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 50224c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 50234c63c245SLuke Dashjr { 50242a362249SJeff Mahoney /* 50252a362249SJeff Mahoney * These all access 32-bit values anyway so no further 50262a362249SJeff Mahoney * handling is necessary. 50272a362249SJeff Mahoney */ 50284c63c245SLuke Dashjr switch (cmd) { 50294c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 50304c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 50314c63c245SLuke Dashjr break; 50324c63c245SLuke Dashjr } 50334c63c245SLuke Dashjr 50344c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 50354c63c245SLuke Dashjr } 50364c63c245SLuke Dashjr #endif 5037