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> 29f46b5a66SChristoph Hellwig #include "ctree.h" 30f46b5a66SChristoph Hellwig #include "disk-io.h" 31949964c9SMarcos Paulo de Souza #include "export.h" 32f46b5a66SChristoph Hellwig #include "transaction.h" 33f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 34f46b5a66SChristoph Hellwig #include "print-tree.h" 35f46b5a66SChristoph Hellwig #include "volumes.h" 36925baeddSChris Mason #include "locking.h" 37581bb050SLi Zefan #include "inode-map.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 1576cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1586cbff00fSChristoph Hellwig { 1595c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(file_inode(file)); 1605c57b8b6SDavid Sterba unsigned int flags = btrfs_inode_flags_to_fsflags(binode->flags); 1616cbff00fSChristoph Hellwig 1626cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1636cbff00fSChristoph Hellwig return -EFAULT; 1646cbff00fSChristoph Hellwig return 0; 1656cbff00fSChristoph Hellwig } 1666cbff00fSChristoph Hellwig 167f37c563bSDavid Sterba /* 168f37c563bSDavid Sterba * Check if @flags are a supported and valid set of FS_*_FL flags and that 169f37c563bSDavid Sterba * the old and new flags are not conflicting 170f37c563bSDavid Sterba */ 171f37c563bSDavid Sterba static int check_fsflags(unsigned int old_flags, unsigned int flags) 17275e7cb7fSLiu Bo { 17375e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 17475e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 17575e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 176e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 177e1e8fb6aSLi Zefan FS_NOCOW_FL)) 17875e7cb7fSLiu Bo return -EOPNOTSUPP; 17975e7cb7fSLiu Bo 180f37c563bSDavid Sterba /* COMPR and NOCOMP on new/old are valid */ 18175e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 18275e7cb7fSLiu Bo return -EINVAL; 18375e7cb7fSLiu Bo 184f37c563bSDavid Sterba if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL)) 185f37c563bSDavid Sterba return -EINVAL; 186f37c563bSDavid Sterba 187f37c563bSDavid Sterba /* NOCOW and compression options are mutually exclusive */ 188f37c563bSDavid Sterba if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 189f37c563bSDavid Sterba return -EINVAL; 190f37c563bSDavid Sterba if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 191f37c563bSDavid Sterba return -EINVAL; 192f37c563bSDavid Sterba 19375e7cb7fSLiu Bo return 0; 19475e7cb7fSLiu Bo } 19575e7cb7fSLiu Bo 1966cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1976cbff00fSChristoph Hellwig { 198496ad9aaSAl Viro struct inode *inode = file_inode(file); 1990b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 2005c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 2015c57b8b6SDavid Sterba struct btrfs_root *root = binode->root; 2026cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 2035aca2842SDarrick J. Wong unsigned int fsflags, old_fsflags; 2046cbff00fSChristoph Hellwig int ret; 205ff9fef55SAnand Jain const char *comp = NULL; 206f37c563bSDavid Sterba u32 binode_flags; 2076cbff00fSChristoph Hellwig 208bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 209bd60ea0fSDavid Sterba return -EPERM; 210bd60ea0fSDavid Sterba 211b83cc969SLi Zefan if (btrfs_root_readonly(root)) 212b83cc969SLi Zefan return -EROFS; 213b83cc969SLi Zefan 2145c57b8b6SDavid Sterba if (copy_from_user(&fsflags, arg, sizeof(fsflags))) 2156cbff00fSChristoph Hellwig return -EFAULT; 2166cbff00fSChristoph Hellwig 217e7848683SJan Kara ret = mnt_want_write_file(file); 218e7848683SJan Kara if (ret) 219e7848683SJan Kara return ret; 220e7848683SJan Kara 2215955102cSAl Viro inode_lock(inode); 2225c57b8b6SDavid Sterba fsflags = btrfs_mask_fsflags_for_type(inode, fsflags); 2235aca2842SDarrick J. Wong old_fsflags = btrfs_inode_flags_to_fsflags(binode->flags); 224f37c563bSDavid Sterba 2255aca2842SDarrick J. Wong ret = vfs_ioc_setflags_prepare(inode, old_fsflags, fsflags); 2265aca2842SDarrick J. Wong if (ret) 2276cbff00fSChristoph Hellwig goto out_unlock; 2286cbff00fSChristoph Hellwig 229f37c563bSDavid Sterba ret = check_fsflags(old_fsflags, fsflags); 230f37c563bSDavid Sterba if (ret) 231f37c563bSDavid Sterba goto out_unlock; 232f37c563bSDavid Sterba 233f37c563bSDavid Sterba binode_flags = binode->flags; 2345c57b8b6SDavid Sterba if (fsflags & FS_SYNC_FL) 235d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_SYNC; 2366cbff00fSChristoph Hellwig else 237d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_SYNC; 2385c57b8b6SDavid Sterba if (fsflags & FS_IMMUTABLE_FL) 239d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_IMMUTABLE; 2406cbff00fSChristoph Hellwig else 241d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_IMMUTABLE; 2425c57b8b6SDavid Sterba if (fsflags & FS_APPEND_FL) 243d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_APPEND; 2446cbff00fSChristoph Hellwig else 245d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_APPEND; 2465c57b8b6SDavid Sterba if (fsflags & FS_NODUMP_FL) 247d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODUMP; 2486cbff00fSChristoph Hellwig else 249d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODUMP; 2505c57b8b6SDavid Sterba if (fsflags & FS_NOATIME_FL) 251d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOATIME; 2526cbff00fSChristoph Hellwig else 253d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOATIME; 2545c57b8b6SDavid Sterba if (fsflags & FS_DIRSYNC_FL) 255d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_DIRSYNC; 2566cbff00fSChristoph Hellwig else 257d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_DIRSYNC; 2585c57b8b6SDavid Sterba if (fsflags & FS_NOCOW_FL) { 25944e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 2607e97b8daSDavid Sterba /* 2617e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2627e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2637e97b8daSDavid Sterba * status of the file and will not set it. 2647e97b8daSDavid Sterba */ 2657e97b8daSDavid Sterba if (inode->i_size == 0) 266d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW | 267d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM; 2687e97b8daSDavid Sterba } else { 269d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW; 2707e97b8daSDavid Sterba } 2717e97b8daSDavid Sterba } else { 2727e97b8daSDavid Sterba /* 27301327610SNicholas D Steeves * Revert back under same assumptions as above 2747e97b8daSDavid Sterba */ 27544e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 2767e97b8daSDavid Sterba if (inode->i_size == 0) 277d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_NODATACOW | 278d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM); 2797e97b8daSDavid Sterba } else { 280d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODATACOW; 2817e97b8daSDavid Sterba } 2827e97b8daSDavid Sterba } 2836cbff00fSChristoph Hellwig 28475e7cb7fSLiu Bo /* 28575e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 28675e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 28775e7cb7fSLiu Bo * things smaller. 28875e7cb7fSLiu Bo */ 2895c57b8b6SDavid Sterba if (fsflags & FS_NOCOMP_FL) { 290d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_COMPRESS; 291d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOCOMPRESS; 2925c57b8b6SDavid Sterba } else if (fsflags & FS_COMPR_FL) { 29363541927SFilipe David Borba Manana 294eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 295eede2bf3SOmar Sandoval ret = -ETXTBSY; 296eede2bf3SOmar Sandoval goto out_unlock; 297eede2bf3SOmar Sandoval } 298eede2bf3SOmar Sandoval 299d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_COMPRESS; 300d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOCOMPRESS; 30163541927SFilipe David Borba Manana 30293370509SDavid Sterba comp = btrfs_compress_type2str(fs_info->compress_type); 30393370509SDavid Sterba if (!comp || comp[0] == 0) 30493370509SDavid Sterba comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB); 305ebcb904dSLi Zefan } else { 306d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 30775e7cb7fSLiu Bo } 3086cbff00fSChristoph Hellwig 309ff9fef55SAnand Jain /* 310ff9fef55SAnand Jain * 1 for inode item 311ff9fef55SAnand Jain * 2 for properties 312ff9fef55SAnand Jain */ 313ff9fef55SAnand Jain trans = btrfs_start_transaction(root, 3); 314f062abf0SLi Zefan if (IS_ERR(trans)) { 315f062abf0SLi Zefan ret = PTR_ERR(trans); 316d2b8fcfeSAnand Jain goto out_unlock; 317f062abf0SLi Zefan } 3186cbff00fSChristoph Hellwig 319ff9fef55SAnand Jain if (comp) { 320ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp, 321ff9fef55SAnand Jain strlen(comp), 0); 322ff9fef55SAnand Jain if (ret) { 323ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 324ff9fef55SAnand Jain goto out_end_trans; 325ff9fef55SAnand Jain } 326ff9fef55SAnand Jain } else { 327ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL, 328ff9fef55SAnand Jain 0, 0); 329ff9fef55SAnand Jain if (ret && ret != -ENODATA) { 330ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 331ff9fef55SAnand Jain goto out_end_trans; 332ff9fef55SAnand Jain } 333ff9fef55SAnand Jain } 334ff9fef55SAnand Jain 335d2b8fcfeSAnand Jain binode->flags = binode_flags; 3367b6a221eSDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 3370c4d2d95SJosef Bacik inode_inc_iversion(inode); 338c2050a45SDeepa Dinamani inode->i_ctime = current_time(inode); 3396cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 3406cbff00fSChristoph Hellwig 341ff9fef55SAnand Jain out_end_trans: 3423a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3436cbff00fSChristoph Hellwig out_unlock: 3445955102cSAl Viro inode_unlock(inode); 345e7848683SJan Kara mnt_drop_write_file(file); 3462d4e6f6aSliubo return ret; 3476cbff00fSChristoph Hellwig } 3486cbff00fSChristoph Hellwig 34919f93b3cSDavid Sterba /* 35019f93b3cSDavid Sterba * Translate btrfs internal inode flags to xflags as expected by the 35119f93b3cSDavid Sterba * FS_IOC_FSGETXATT ioctl. Filter only the supported ones, unknown flags are 35219f93b3cSDavid Sterba * silently dropped. 35319f93b3cSDavid Sterba */ 35419f93b3cSDavid Sterba static unsigned int btrfs_inode_flags_to_xflags(unsigned int flags) 35519f93b3cSDavid Sterba { 35619f93b3cSDavid Sterba unsigned int xflags = 0; 35719f93b3cSDavid Sterba 35819f93b3cSDavid Sterba if (flags & BTRFS_INODE_APPEND) 35919f93b3cSDavid Sterba xflags |= FS_XFLAG_APPEND; 36019f93b3cSDavid Sterba if (flags & BTRFS_INODE_IMMUTABLE) 36119f93b3cSDavid Sterba xflags |= FS_XFLAG_IMMUTABLE; 36219f93b3cSDavid Sterba if (flags & BTRFS_INODE_NOATIME) 36319f93b3cSDavid Sterba xflags |= FS_XFLAG_NOATIME; 36419f93b3cSDavid Sterba if (flags & BTRFS_INODE_NODUMP) 36519f93b3cSDavid Sterba xflags |= FS_XFLAG_NODUMP; 36619f93b3cSDavid Sterba if (flags & BTRFS_INODE_SYNC) 36719f93b3cSDavid Sterba xflags |= FS_XFLAG_SYNC; 36819f93b3cSDavid Sterba 36919f93b3cSDavid Sterba return xflags; 37019f93b3cSDavid Sterba } 37119f93b3cSDavid Sterba 37219f93b3cSDavid Sterba /* Check if @flags are a supported and valid set of FS_XFLAGS_* flags */ 37319f93b3cSDavid Sterba static int check_xflags(unsigned int flags) 37419f93b3cSDavid Sterba { 37519f93b3cSDavid Sterba if (flags & ~(FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE | FS_XFLAG_NOATIME | 37619f93b3cSDavid Sterba FS_XFLAG_NODUMP | FS_XFLAG_SYNC)) 37719f93b3cSDavid Sterba return -EOPNOTSUPP; 37819f93b3cSDavid Sterba return 0; 37919f93b3cSDavid Sterba } 38019f93b3cSDavid Sterba 381e4202ac9SDavid Sterba /* 382e4202ac9SDavid Sterba * Set the xflags from the internal inode flags. The remaining items of fsxattr 383e4202ac9SDavid Sterba * are zeroed. 384e4202ac9SDavid Sterba */ 385e4202ac9SDavid Sterba static int btrfs_ioctl_fsgetxattr(struct file *file, void __user *arg) 386e4202ac9SDavid Sterba { 387e4202ac9SDavid Sterba struct btrfs_inode *binode = BTRFS_I(file_inode(file)); 388e4202ac9SDavid Sterba struct fsxattr fa; 389e4202ac9SDavid Sterba 3907b0e492eSDarrick J. Wong simple_fill_fsxattr(&fa, btrfs_inode_flags_to_xflags(binode->flags)); 391e4202ac9SDavid Sterba if (copy_to_user(arg, &fa, sizeof(fa))) 392e4202ac9SDavid Sterba return -EFAULT; 393e4202ac9SDavid Sterba 394e4202ac9SDavid Sterba return 0; 395e4202ac9SDavid Sterba } 396e4202ac9SDavid Sterba 397025f2121SDavid Sterba static int btrfs_ioctl_fssetxattr(struct file *file, void __user *arg) 398025f2121SDavid Sterba { 399025f2121SDavid Sterba struct inode *inode = file_inode(file); 400025f2121SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 401025f2121SDavid Sterba struct btrfs_root *root = binode->root; 402025f2121SDavid Sterba struct btrfs_trans_handle *trans; 4037b0e492eSDarrick J. Wong struct fsxattr fa, old_fa; 404025f2121SDavid Sterba unsigned old_flags; 405025f2121SDavid Sterba unsigned old_i_flags; 406025f2121SDavid Sterba int ret = 0; 407025f2121SDavid Sterba 408025f2121SDavid Sterba if (!inode_owner_or_capable(inode)) 409025f2121SDavid Sterba return -EPERM; 410025f2121SDavid Sterba 411025f2121SDavid Sterba if (btrfs_root_readonly(root)) 412025f2121SDavid Sterba return -EROFS; 413025f2121SDavid Sterba 414025f2121SDavid Sterba if (copy_from_user(&fa, arg, sizeof(fa))) 415025f2121SDavid Sterba return -EFAULT; 416025f2121SDavid Sterba 417025f2121SDavid Sterba ret = check_xflags(fa.fsx_xflags); 418025f2121SDavid Sterba if (ret) 419025f2121SDavid Sterba return ret; 420025f2121SDavid Sterba 421025f2121SDavid Sterba if (fa.fsx_extsize != 0 || fa.fsx_projid != 0 || fa.fsx_cowextsize != 0) 422025f2121SDavid Sterba return -EOPNOTSUPP; 423025f2121SDavid Sterba 424025f2121SDavid Sterba ret = mnt_want_write_file(file); 425025f2121SDavid Sterba if (ret) 426025f2121SDavid Sterba return ret; 427025f2121SDavid Sterba 428025f2121SDavid Sterba inode_lock(inode); 429025f2121SDavid Sterba 430025f2121SDavid Sterba old_flags = binode->flags; 431025f2121SDavid Sterba old_i_flags = inode->i_flags; 432025f2121SDavid Sterba 4337b0e492eSDarrick J. Wong simple_fill_fsxattr(&old_fa, 4347b0e492eSDarrick J. Wong btrfs_inode_flags_to_xflags(binode->flags)); 4357b0e492eSDarrick J. Wong ret = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa); 4367b0e492eSDarrick J. Wong if (ret) 437025f2121SDavid Sterba goto out_unlock; 438025f2121SDavid Sterba 439025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_SYNC) 440025f2121SDavid Sterba binode->flags |= BTRFS_INODE_SYNC; 441025f2121SDavid Sterba else 442025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_SYNC; 443025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_IMMUTABLE) 444025f2121SDavid Sterba binode->flags |= BTRFS_INODE_IMMUTABLE; 445025f2121SDavid Sterba else 446025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_IMMUTABLE; 447025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_APPEND) 448025f2121SDavid Sterba binode->flags |= BTRFS_INODE_APPEND; 449025f2121SDavid Sterba else 450025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_APPEND; 451025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_NODUMP) 452025f2121SDavid Sterba binode->flags |= BTRFS_INODE_NODUMP; 453025f2121SDavid Sterba else 454025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_NODUMP; 455025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_NOATIME) 456025f2121SDavid Sterba binode->flags |= BTRFS_INODE_NOATIME; 457025f2121SDavid Sterba else 458025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_NOATIME; 459025f2121SDavid Sterba 460025f2121SDavid Sterba /* 1 item for the inode */ 461025f2121SDavid Sterba trans = btrfs_start_transaction(root, 1); 462025f2121SDavid Sterba if (IS_ERR(trans)) { 463025f2121SDavid Sterba ret = PTR_ERR(trans); 464025f2121SDavid Sterba goto out_unlock; 465025f2121SDavid Sterba } 466025f2121SDavid Sterba 467025f2121SDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 468025f2121SDavid Sterba inode_inc_iversion(inode); 469025f2121SDavid Sterba inode->i_ctime = current_time(inode); 470025f2121SDavid Sterba ret = btrfs_update_inode(trans, root, inode); 471025f2121SDavid Sterba 472025f2121SDavid Sterba btrfs_end_transaction(trans); 473025f2121SDavid Sterba 474025f2121SDavid Sterba out_unlock: 475025f2121SDavid Sterba if (ret) { 476025f2121SDavid Sterba binode->flags = old_flags; 477025f2121SDavid Sterba inode->i_flags = old_i_flags; 478025f2121SDavid Sterba } 479025f2121SDavid Sterba 480025f2121SDavid Sterba inode_unlock(inode); 481025f2121SDavid Sterba mnt_drop_write_file(file); 482025f2121SDavid Sterba 483025f2121SDavid Sterba return ret; 484025f2121SDavid Sterba } 485025f2121SDavid Sterba 4866cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 4876cbff00fSChristoph Hellwig { 488496ad9aaSAl Viro struct inode *inode = file_inode(file); 4896cbff00fSChristoph Hellwig 4906cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 4916cbff00fSChristoph Hellwig } 492f46b5a66SChristoph Hellwig 493b929c1d8SMarcos Paulo de Souza static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, 494b929c1d8SMarcos Paulo de Souza void __user *arg) 495f7039b1dSLi Dongyang { 496f7039b1dSLi Dongyang struct btrfs_device *device; 497f7039b1dSLi Dongyang struct request_queue *q; 498f7039b1dSLi Dongyang struct fstrim_range range; 499f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 500f7039b1dSLi Dongyang u64 num_devices = 0; 501f7039b1dSLi Dongyang int ret; 502f7039b1dSLi Dongyang 503f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 504f7039b1dSLi Dongyang return -EPERM; 505f7039b1dSLi Dongyang 506f35f06c3SFilipe Manana /* 507f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 508f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 509f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 510f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 511f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 512f35f06c3SFilipe Manana */ 513f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 514f35f06c3SFilipe Manana return -EROFS; 515f35f06c3SFilipe Manana 5161f78160cSXiao Guangrong rcu_read_lock(); 5171f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 5181f78160cSXiao Guangrong dev_list) { 519f7039b1dSLi Dongyang if (!device->bdev) 520f7039b1dSLi Dongyang continue; 521f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 522f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 523f7039b1dSLi Dongyang num_devices++; 52450d0446eSSeraphime Kirkovski minlen = min_t(u64, q->limits.discard_granularity, 525f7039b1dSLi Dongyang minlen); 526f7039b1dSLi Dongyang } 527f7039b1dSLi Dongyang } 5281f78160cSXiao Guangrong rcu_read_unlock(); 529f4c697e6SLukas Czerner 530f7039b1dSLi Dongyang if (!num_devices) 531f7039b1dSLi Dongyang return -EOPNOTSUPP; 532f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 533f7039b1dSLi Dongyang return -EFAULT; 5346ba9fc8eSQu Wenruo 5356ba9fc8eSQu Wenruo /* 5366ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 5376ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 5386ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 5396ba9fc8eSQu Wenruo */ 5406ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 541f4c697e6SLukas Czerner return -EINVAL; 542f7039b1dSLi Dongyang 543f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 5442ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 545f7039b1dSLi Dongyang if (ret < 0) 546f7039b1dSLi Dongyang return ret; 547f7039b1dSLi Dongyang 548f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 549f7039b1dSLi Dongyang return -EFAULT; 550f7039b1dSLi Dongyang 551f7039b1dSLi Dongyang return 0; 552f7039b1dSLi Dongyang } 553f7039b1dSLi Dongyang 554e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 555dd5f9615SStefan Behrens { 55646e0f66aSChris Mason int i; 55746e0f66aSChris Mason 55846e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 55946e0f66aSChris Mason if (uuid[i]) 56046e0f66aSChris Mason return 0; 56146e0f66aSChris Mason } 56246e0f66aSChris Mason return 1; 563dd5f9615SStefan Behrens } 564dd5f9615SStefan Behrens 565d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 566cb8e7090SChristoph Hellwig struct dentry *dentry, 56752f75f4fSDavid Sterba const char *name, int namelen, 5688696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 569f46b5a66SChristoph Hellwig { 5700b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 571f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 572f46b5a66SChristoph Hellwig struct btrfs_key key; 57349a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 574f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 575f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 576d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 57776dda93cSYan, Zheng struct btrfs_root *new_root; 578d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 57995582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 5805662344bSTsutomu Itoh struct inode *inode; 581f46b5a66SChristoph Hellwig int ret; 582f46b5a66SChristoph Hellwig int err; 5832dfb1e43SQu Wenruo dev_t anon_dev = 0; 584f46b5a66SChristoph Hellwig u64 objectid; 585f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 5863de4586cSChris Mason u64 index = 0; 587f46b5a66SChristoph Hellwig 58849a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 58949a3c4d9SDavid Sterba if (!root_item) 59049a3c4d9SDavid Sterba return -ENOMEM; 59149a3c4d9SDavid Sterba 5920b246afaSJeff Mahoney ret = btrfs_find_free_objectid(fs_info->tree_root, &objectid); 5932fbe8c8aSAl Viro if (ret) 59449a3c4d9SDavid Sterba goto fail_free; 5956a912213SJosef Bacik 5962dfb1e43SQu Wenruo ret = get_anon_bdev(&anon_dev); 5972dfb1e43SQu Wenruo if (ret < 0) 5982dfb1e43SQu Wenruo goto fail_free; 5992dfb1e43SQu Wenruo 600e09fe2d2SQu Wenruo /* 601e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 60201327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 603e09fe2d2SQu Wenruo */ 60449a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 60549a3c4d9SDavid Sterba ret = -ENOSPC; 60649a3c4d9SDavid Sterba goto fail_free; 60749a3c4d9SDavid Sterba } 608e09fe2d2SQu Wenruo 609d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 6109ed74f2dSJosef Bacik /* 611d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 612d5c12070SMiao Xie * of create_snapshot(). 6139ed74f2dSJosef Bacik */ 614c4c129dbSGu JinXiang ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false); 615d5c12070SMiao Xie if (ret) 61649a3c4d9SDavid Sterba goto fail_free; 617f46b5a66SChristoph Hellwig 618d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 619d5c12070SMiao Xie if (IS_ERR(trans)) { 620d5c12070SMiao Xie ret = PTR_ERR(trans); 6217775c818SDavid Sterba btrfs_subvolume_release_metadata(fs_info, &block_rsv); 62249a3c4d9SDavid Sterba goto fail_free; 623d5c12070SMiao Xie } 624d5c12070SMiao Xie trans->block_rsv = &block_rsv; 625d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 626f46b5a66SChristoph Hellwig 627a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 6286f72c7e2SArne Jansen if (ret) 6296f72c7e2SArne Jansen goto fail; 6306f72c7e2SArne Jansen 6314d75f8a9SDavid Sterba leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0); 6328e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 6338e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 6348e8a1e31SJosef Bacik goto fail; 6358e8a1e31SJosef Bacik } 636f46b5a66SChristoph Hellwig 637f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 638f46b5a66SChristoph Hellwig 63949a3c4d9SDavid Sterba inode_item = &root_item->inode; 6403cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6413cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6423cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 643da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6440b246afaSJeff Mahoney fs_info->nodesize); 6453cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 646f46b5a66SChristoph Hellwig 64749a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 64849a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6493cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 65008fe4db1SLi Zefan 65149a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 65249a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 65349a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 65449a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 65549a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 65649a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 657f46b5a66SChristoph Hellwig 65849a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 65949a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 660807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 66149a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 66249a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 66349a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 66449a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 66549a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 666f46b5a66SChristoph Hellwig 667925baeddSChris Mason btrfs_tree_unlock(leaf); 668f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 669f46b5a66SChristoph Hellwig leaf = NULL; 670f46b5a66SChristoph Hellwig 67149a3c4d9SDavid Sterba btrfs_set_root_dirid(root_item, new_dirid); 672f46b5a66SChristoph Hellwig 673f46b5a66SChristoph Hellwig key.objectid = objectid; 6745d4f98a2SYan Zheng key.offset = 0; 675962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 6760b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 67749a3c4d9SDavid Sterba root_item); 678f46b5a66SChristoph Hellwig if (ret) 679f46b5a66SChristoph Hellwig goto fail; 680f46b5a66SChristoph Hellwig 68176dda93cSYan, Zheng key.offset = (u64)-1; 6822dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 68379787eaaSJeff Mahoney if (IS_ERR(new_root)) { 6842dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 68579787eaaSJeff Mahoney ret = PTR_ERR(new_root); 68666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 68779787eaaSJeff Mahoney goto fail; 68879787eaaSJeff Mahoney } 6892dfb1e43SQu Wenruo /* Freeing will be done in btrfs_put_root() of new_root */ 6902dfb1e43SQu Wenruo anon_dev = 0; 69176dda93cSYan, Zheng 69276dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 69376dda93cSYan, Zheng 69463541927SFilipe David Borba Manana ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); 69500246528SJosef Bacik btrfs_put_root(new_root); 696ce598979SMark Fasheh if (ret) { 697ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 69866642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 699ce598979SMark Fasheh goto fail; 700ce598979SMark Fasheh } 701ce598979SMark Fasheh 702f32e48e9SChandan Rajendra mutex_lock(&new_root->objectid_mutex); 703f32e48e9SChandan Rajendra new_root->highest_objectid = new_dirid; 704f32e48e9SChandan Rajendra mutex_unlock(&new_root->objectid_mutex); 705f32e48e9SChandan Rajendra 706f46b5a66SChristoph Hellwig /* 707f46b5a66SChristoph Hellwig * insert the directory item 708f46b5a66SChristoph Hellwig */ 709877574e2SNikolay Borisov ret = btrfs_set_inode_index(BTRFS_I(dir), &index); 71079787eaaSJeff Mahoney if (ret) { 71166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 71279787eaaSJeff Mahoney goto fail; 71379787eaaSJeff Mahoney } 7143de4586cSChris Mason 715684572dfSLu Fengqi ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key, 7163de4586cSChris Mason BTRFS_FT_DIR, index); 71779787eaaSJeff Mahoney if (ret) { 71866642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 719f46b5a66SChristoph Hellwig goto fail; 72079787eaaSJeff Mahoney } 7210660b5afSChris Mason 7226ef06d27SNikolay Borisov btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); 72352c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 724c7e54b51SJosef Bacik if (ret) { 725c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 726c7e54b51SJosef Bacik goto fail; 727c7e54b51SJosef Bacik } 72852c26179SYan Zheng 7296025c19fSLu Fengqi ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid, 7304a0cc7caSNikolay Borisov btrfs_ino(BTRFS_I(dir)), index, name, namelen); 731c7e54b51SJosef Bacik if (ret) { 732c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 733c7e54b51SJosef Bacik goto fail; 734c7e54b51SJosef Bacik } 7350660b5afSChris Mason 736cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7376bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 738dd5f9615SStefan Behrens if (ret) 73966642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 740dd5f9615SStefan Behrens 741f46b5a66SChristoph Hellwig fail: 74249a3c4d9SDavid Sterba kfree(root_item); 743d5c12070SMiao Xie trans->block_rsv = NULL; 744d5c12070SMiao Xie trans->bytes_reserved = 0; 7457775c818SDavid Sterba btrfs_subvolume_release_metadata(fs_info, &block_rsv); 746de6e8200SLiu Bo 7473a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 748f46b5a66SChristoph Hellwig if (err && !ret) 749f46b5a66SChristoph Hellwig ret = err; 7501a65e24bSChris Mason 7515662344bSTsutomu Itoh if (!ret) { 7525662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 753de6e8200SLiu Bo if (IS_ERR(inode)) 754de6e8200SLiu Bo return PTR_ERR(inode); 7555662344bSTsutomu Itoh d_instantiate(dentry, inode); 7565662344bSTsutomu Itoh } 757f46b5a66SChristoph Hellwig return ret; 75849a3c4d9SDavid Sterba 75949a3c4d9SDavid Sterba fail_free: 7602dfb1e43SQu Wenruo if (anon_dev) 7612dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 76249a3c4d9SDavid Sterba kfree(root_item); 76349a3c4d9SDavid Sterba return ret; 764f46b5a66SChristoph Hellwig } 765f46b5a66SChristoph Hellwig 766e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7679babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 768e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 769f46b5a66SChristoph Hellwig { 7700b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7712e4bfab9SYan, Zheng struct inode *inode; 772f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 773f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7742e4bfab9SYan, Zheng int ret; 775f46b5a66SChristoph Hellwig 77692a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 777f46b5a66SChristoph Hellwig return -EINVAL; 778f46b5a66SChristoph Hellwig 779eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 780eede2bf3SOmar Sandoval btrfs_warn(fs_info, 781eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 782eede2bf3SOmar Sandoval return -ETXTBSY; 783eede2bf3SOmar Sandoval } 784eede2bf3SOmar Sandoval 78523269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 786a1ee7362SDavid Sterba if (!pending_snapshot) 787a1ee7362SDavid Sterba return -ENOMEM; 788a1ee7362SDavid Sterba 7892dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 7902dfb1e43SQu Wenruo if (ret < 0) 7912dfb1e43SQu Wenruo goto free_pending; 792b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 79323269bf5SDavid Sterba GFP_KERNEL); 7948546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 7958546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 796b0c0ea63SDavid Sterba ret = -ENOMEM; 797b0c0ea63SDavid Sterba goto free_pending; 798b0c0ea63SDavid Sterba } 799b0c0ea63SDavid Sterba 80066d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 80166d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 802d5c12070SMiao Xie /* 803d5c12070SMiao Xie * 1 - parent dir inode 804d5c12070SMiao Xie * 2 - dir entries 805d5c12070SMiao Xie * 1 - root item 806d5c12070SMiao Xie * 2 - root ref/backref 807d5c12070SMiao Xie * 1 - root of snapshot 808dd5f9615SStefan Behrens * 1 - UUID item 809d5c12070SMiao Xie */ 810d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 811dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 812ee3441b4SJeff Mahoney false); 813d5c12070SMiao Xie if (ret) 814c11fbb6eSRobbie Ko goto free_pending; 815d5c12070SMiao Xie 816a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 817a22285a6SYan, Zheng pending_snapshot->root = root; 818b83cc969SLi Zefan pending_snapshot->readonly = readonly; 819e9662f70SMiao Xie pending_snapshot->dir = dir; 8208696c533SMiao Xie pending_snapshot->inherit = inherit; 821a22285a6SYan, Zheng 822d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 823a22285a6SYan, Zheng if (IS_ERR(trans)) { 824a22285a6SYan, Zheng ret = PTR_ERR(trans); 825a22285a6SYan, Zheng goto fail; 826a22285a6SYan, Zheng } 827a22285a6SYan, Zheng 8280b246afaSJeff Mahoney spin_lock(&fs_info->trans_lock); 829a22285a6SYan, Zheng list_add(&pending_snapshot->list, 830a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 8310b246afaSJeff Mahoney spin_unlock(&fs_info->trans_lock); 8329babda9fSNikolay Borisov 8333a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 834aec8030aSMiao Xie if (ret) 835c37b2b62SJosef Bacik goto fail; 836a22285a6SYan, Zheng 837a22285a6SYan, Zheng ret = pending_snapshot->error; 838f46b5a66SChristoph Hellwig if (ret) 8392e4bfab9SYan, Zheng goto fail; 840f46b5a66SChristoph Hellwig 841d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 842d3797308SChris Mason if (ret) 843d3797308SChris Mason goto fail; 844d3797308SChris Mason 8452b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8462e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8472e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8482e4bfab9SYan, Zheng goto fail; 8492e4bfab9SYan, Zheng } 8505662344bSTsutomu Itoh 8512e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8522e4bfab9SYan, Zheng ret = 0; 8532dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8542e4bfab9SYan, Zheng fail: 8552dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 8562dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8572dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 85800246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 8597775c818SDavid Sterba btrfs_subvolume_release_metadata(fs_info, &pending_snapshot->block_rsv); 860b0c0ea63SDavid Sterba free_pending: 8612dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8622dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 863b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8648546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 865a1ee7362SDavid Sterba kfree(pending_snapshot); 866a1ee7362SDavid Sterba 867f46b5a66SChristoph Hellwig return ret; 868f46b5a66SChristoph Hellwig } 869f46b5a66SChristoph Hellwig 8704260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8714260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8724260f7c7SSage Weil * whether the type of victim is right. 8734260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8744260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8754260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8764260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8774260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8784260f7c7SSage Weil * a. be owner of dir, or 8794260f7c7SSage Weil * b. be owner of victim, or 8804260f7c7SSage Weil * c. have CAP_FOWNER capability 88101327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 8824260f7c7SSage Weil * links pointing to it. 8834260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8844260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 8854260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 8864260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 8874260f7c7SSage Weil * nfs_async_unlink(). 8884260f7c7SSage Weil */ 8894260f7c7SSage Weil 8904260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 8914260f7c7SSage Weil { 8924260f7c7SSage Weil int error; 8934260f7c7SSage Weil 8942b0143b5SDavid Howells if (d_really_is_negative(victim)) 8954260f7c7SSage Weil return -ENOENT; 8964260f7c7SSage Weil 8972b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 8984fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 8994260f7c7SSage Weil 9004260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 9014260f7c7SSage Weil if (error) 9024260f7c7SSage Weil return error; 9034260f7c7SSage Weil if (IS_APPEND(dir)) 9044260f7c7SSage Weil return -EPERM; 9052b0143b5SDavid Howells if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) || 9062b0143b5SDavid Howells IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim))) 9074260f7c7SSage Weil return -EPERM; 9084260f7c7SSage Weil if (isdir) { 909e36cb0b8SDavid Howells if (!d_is_dir(victim)) 9104260f7c7SSage Weil return -ENOTDIR; 9114260f7c7SSage Weil if (IS_ROOT(victim)) 9124260f7c7SSage Weil return -EBUSY; 913e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 9144260f7c7SSage Weil return -EISDIR; 9154260f7c7SSage Weil if (IS_DEADDIR(dir)) 9164260f7c7SSage Weil return -ENOENT; 9174260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 9184260f7c7SSage Weil return -EBUSY; 9194260f7c7SSage Weil return 0; 9204260f7c7SSage Weil } 9214260f7c7SSage Weil 922cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 923cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 924cb8e7090SChristoph Hellwig { 9252b0143b5SDavid Howells if (d_really_is_positive(child)) 926cb8e7090SChristoph Hellwig return -EEXIST; 927cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 928cb8e7090SChristoph Hellwig return -ENOENT; 929cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 930cb8e7090SChristoph Hellwig } 931cb8e7090SChristoph Hellwig 932cb8e7090SChristoph Hellwig /* 933cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 934cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 935cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 936cb8e7090SChristoph Hellwig */ 93792872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 93852f75f4fSDavid Sterba const char *name, int namelen, 93972fd032eSSage Weil struct btrfs_root *snap_src, 9409babda9fSNikolay Borisov bool readonly, 9418696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 942cb8e7090SChristoph Hellwig { 9432b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9440b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 945cb8e7090SChristoph Hellwig struct dentry *dentry; 946cb8e7090SChristoph Hellwig int error; 947cb8e7090SChristoph Hellwig 94800235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 94900235411SAl Viro if (error == -EINTR) 95000235411SAl Viro return error; 951cb8e7090SChristoph Hellwig 952cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 953cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 954cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 955cb8e7090SChristoph Hellwig goto out_unlock; 956cb8e7090SChristoph Hellwig 95776dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 958cb8e7090SChristoph Hellwig if (error) 959a874a63eSLiu Bo goto out_dput; 960cb8e7090SChristoph Hellwig 9619c52057cSChris Mason /* 9629c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9639c52057cSChris Mason * check for them now when we can safely fail 9649c52057cSChris Mason */ 9659c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 9669c52057cSChris Mason dir->i_ino, name, 9679c52057cSChris Mason namelen); 9689c52057cSChris Mason if (error) 9699c52057cSChris Mason goto out_dput; 9709c52057cSChris Mason 9710b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 97276dda93cSYan, Zheng 97376dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 97476dda93cSYan, Zheng goto out_up_read; 97576dda93cSYan, Zheng 9769babda9fSNikolay Borisov if (snap_src) 9779babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 9789babda9fSNikolay Borisov else 9799babda9fSNikolay Borisov error = create_subvol(dir, dentry, name, namelen, inherit); 9809babda9fSNikolay Borisov 98176dda93cSYan, Zheng if (!error) 98276dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 98376dda93cSYan, Zheng out_up_read: 9840b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 985cb8e7090SChristoph Hellwig out_dput: 986cb8e7090SChristoph Hellwig dput(dentry); 987cb8e7090SChristoph Hellwig out_unlock: 9885955102cSAl Viro inode_unlock(dir); 989cb8e7090SChristoph Hellwig return error; 990cb8e7090SChristoph Hellwig } 991cb8e7090SChristoph Hellwig 992c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 993c11fbb6eSRobbie Ko const char *name, int namelen, 994c11fbb6eSRobbie Ko struct btrfs_root *root, 995c11fbb6eSRobbie Ko bool readonly, 996c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 997c11fbb6eSRobbie Ko { 998c11fbb6eSRobbie Ko int ret; 999c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 1000c11fbb6eSRobbie Ko 1001c11fbb6eSRobbie Ko /* 1002c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 1003c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 1004c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 1005c11fbb6eSRobbie Ko */ 1006c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 1007c11fbb6eSRobbie Ko 1008c11fbb6eSRobbie Ko ret = btrfs_start_delalloc_snapshot(root); 1009c11fbb6eSRobbie Ko if (ret) 1010c11fbb6eSRobbie Ko goto out; 1011c11fbb6eSRobbie Ko 1012c11fbb6eSRobbie Ko /* 1013c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 1014c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 1015c11fbb6eSRobbie Ko * creation. 1016c11fbb6eSRobbie Ko */ 1017c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 1018c11fbb6eSRobbie Ko snapshot_force_cow = true; 1019c11fbb6eSRobbie Ko 1020c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 1021c11fbb6eSRobbie Ko 1022c11fbb6eSRobbie Ko ret = btrfs_mksubvol(parent, name, namelen, 1023c11fbb6eSRobbie Ko root, readonly, inherit); 1024c11fbb6eSRobbie Ko out: 1025c11fbb6eSRobbie Ko if (snapshot_force_cow) 1026c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 1027c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 1028c11fbb6eSRobbie Ko return ret; 1029c11fbb6eSRobbie Ko } 1030c11fbb6eSRobbie Ko 10314cb5300bSChris Mason /* 10324cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 10334cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 10344cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 10354cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 10364cb5300bSChris Mason * part of the file 10374cb5300bSChris Mason */ 1038aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 10394cb5300bSChris Mason { 10404cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 10414cb5300bSChris Mason struct extent_map *em = NULL; 10424cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 10434cb5300bSChris Mason u64 end; 10444cb5300bSChris Mason 10454cb5300bSChris Mason read_lock(&em_tree->lock); 104609cbfeafSKirill A. Shutemov em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE); 10474cb5300bSChris Mason read_unlock(&em_tree->lock); 10484cb5300bSChris Mason 10494cb5300bSChris Mason if (em) { 10504cb5300bSChris Mason end = extent_map_end(em); 10514cb5300bSChris Mason free_extent_map(em); 10524cb5300bSChris Mason if (end - offset > thresh) 10534cb5300bSChris Mason return 0; 10544cb5300bSChris Mason } 10554cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 10564cb5300bSChris Mason thresh /= 2; 10574cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 10584cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 10594cb5300bSChris Mason if (end >= thresh) 10604cb5300bSChris Mason return 0; 10614cb5300bSChris Mason return 1; 10624cb5300bSChris Mason } 10634cb5300bSChris Mason 10644cb5300bSChris Mason /* 10654cb5300bSChris Mason * helper function to walk through a file and find extents 10664cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 10674cb5300bSChris Mason * 10684cb5300bSChris Mason * This is used by the defragging code to find new and small 10694cb5300bSChris Mason * extents 10704cb5300bSChris Mason */ 10714cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 10724cb5300bSChris Mason struct inode *inode, u64 newer_than, 1073aab110abSDavid Sterba u64 *off, u32 thresh) 10744cb5300bSChris Mason { 10754cb5300bSChris Mason struct btrfs_path *path; 10764cb5300bSChris Mason struct btrfs_key min_key; 10774cb5300bSChris Mason struct extent_buffer *leaf; 10784cb5300bSChris Mason struct btrfs_file_extent_item *extent; 10794cb5300bSChris Mason int type; 10804cb5300bSChris Mason int ret; 10814a0cc7caSNikolay Borisov u64 ino = btrfs_ino(BTRFS_I(inode)); 10824cb5300bSChris Mason 10834cb5300bSChris Mason path = btrfs_alloc_path(); 10844cb5300bSChris Mason if (!path) 10854cb5300bSChris Mason return -ENOMEM; 10864cb5300bSChris Mason 1087a4689d2bSDavid Sterba min_key.objectid = ino; 10884cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 10894cb5300bSChris Mason min_key.offset = *off; 10904cb5300bSChris Mason 10914cb5300bSChris Mason while (1) { 10926174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 10934cb5300bSChris Mason if (ret != 0) 10944cb5300bSChris Mason goto none; 1095f094c9bdSFilipe Manana process_slot: 1096a4689d2bSDavid Sterba if (min_key.objectid != ino) 10974cb5300bSChris Mason goto none; 10984cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 10994cb5300bSChris Mason goto none; 11004cb5300bSChris Mason 11014cb5300bSChris Mason leaf = path->nodes[0]; 11024cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 11034cb5300bSChris Mason struct btrfs_file_extent_item); 11044cb5300bSChris Mason 11054cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 11064cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 11074cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 11084cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 11094cb5300bSChris Mason *off = min_key.offset; 11104cb5300bSChris Mason btrfs_free_path(path); 11114cb5300bSChris Mason return 0; 11124cb5300bSChris Mason } 11134cb5300bSChris Mason 1114f094c9bdSFilipe Manana path->slots[0]++; 1115f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 1116f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 1117f094c9bdSFilipe Manana goto process_slot; 1118f094c9bdSFilipe Manana } 1119f094c9bdSFilipe Manana 11204cb5300bSChris Mason if (min_key.offset == (u64)-1) 11214cb5300bSChris Mason goto none; 11224cb5300bSChris Mason 11234cb5300bSChris Mason min_key.offset++; 11244cb5300bSChris Mason btrfs_release_path(path); 11254cb5300bSChris Mason } 11264cb5300bSChris Mason none: 11274cb5300bSChris Mason btrfs_free_path(path); 11284cb5300bSChris Mason return -ENOENT; 11294cb5300bSChris Mason } 11304cb5300bSChris Mason 11316c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 113217ce6ef8SLiu Bo { 113317ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1134940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 11356c282eb4SLi Zefan struct extent_map *em; 113609cbfeafSKirill A. Shutemov u64 len = PAGE_SIZE; 1137940100a4SChris Mason 1138940100a4SChris Mason /* 1139940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1140940100a4SChris Mason * the full extent lock 1141940100a4SChris Mason */ 1142940100a4SChris Mason read_lock(&em_tree->lock); 1143940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 1144940100a4SChris Mason read_unlock(&em_tree->lock); 1145940100a4SChris Mason 1146940100a4SChris Mason if (!em) { 1147308d9800SFilipe Manana struct extent_state *cached = NULL; 1148308d9800SFilipe Manana u64 end = start + len - 1; 1149308d9800SFilipe Manana 1150940100a4SChris Mason /* get the big lock and read metadata off disk */ 1151ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 115239b07b5dSOmar Sandoval em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len); 1153e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1154940100a4SChris Mason 11556cf8bfbfSDan Carpenter if (IS_ERR(em)) 11566c282eb4SLi Zefan return NULL; 1157940100a4SChris Mason } 1158940100a4SChris Mason 11596c282eb4SLi Zefan return em; 11606c282eb4SLi Zefan } 11616c282eb4SLi Zefan 11626c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 11636c282eb4SLi Zefan { 11646c282eb4SLi Zefan struct extent_map *next; 11656c282eb4SLi Zefan bool ret = true; 11666c282eb4SLi Zefan 11676c282eb4SLi Zefan /* this is the last extent */ 11686c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 11696c282eb4SLi Zefan return false; 11706c282eb4SLi Zefan 11716c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1172e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1173e9512d72SChris Mason ret = false; 1174e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1175ee22184bSByongho Lee (em->block_len > SZ_128K && next->block_len > SZ_128K)) 11766c282eb4SLi Zefan ret = false; 11776c282eb4SLi Zefan 11786c282eb4SLi Zefan free_extent_map(next); 11796c282eb4SLi Zefan return ret; 11806c282eb4SLi Zefan } 11816c282eb4SLi Zefan 1182aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1183a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1184a43a2111SAndrew Mahone int compress) 11856c282eb4SLi Zefan { 11866c282eb4SLi Zefan struct extent_map *em; 11876c282eb4SLi Zefan int ret = 1; 11886c282eb4SLi Zefan bool next_mergeable = true; 11894a3560c4SLiu Bo bool prev_mergeable = true; 11906c282eb4SLi Zefan 11916c282eb4SLi Zefan /* 11926c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 11936c282eb4SLi Zefan * defragging it 11946c282eb4SLi Zefan */ 11956c282eb4SLi Zefan if (start < *defrag_end) 11966c282eb4SLi Zefan return 1; 11976c282eb4SLi Zefan 11986c282eb4SLi Zefan *skip = 0; 11996c282eb4SLi Zefan 12006c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 12016c282eb4SLi Zefan if (!em) 12026c282eb4SLi Zefan return 0; 12036c282eb4SLi Zefan 1204940100a4SChris Mason /* this will cover holes, and inline extents */ 120517ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1206940100a4SChris Mason ret = 0; 120717ce6ef8SLiu Bo goto out; 120817ce6ef8SLiu Bo } 120917ce6ef8SLiu Bo 12104a3560c4SLiu Bo if (!*defrag_end) 12114a3560c4SLiu Bo prev_mergeable = false; 12124a3560c4SLiu Bo 12136c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1214940100a4SChris Mason /* 12156c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 12166c282eb4SLi Zefan * real extent, don't bother defragging it 1217940100a4SChris Mason */ 1218a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 12194a3560c4SLiu Bo (em->len >= thresh || (!next_mergeable && !prev_mergeable))) 1220940100a4SChris Mason ret = 0; 122117ce6ef8SLiu Bo out: 1222940100a4SChris Mason /* 1223940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1224940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1225940100a4SChris Mason * so that the next tiny extent will force a defrag. 1226940100a4SChris Mason * 1227940100a4SChris Mason * The end result of this is that tiny extents before a single big 1228940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1229940100a4SChris Mason */ 1230940100a4SChris Mason if (ret) { 1231940100a4SChris Mason *defrag_end = extent_map_end(em); 1232940100a4SChris Mason } else { 1233940100a4SChris Mason *last_len = 0; 1234940100a4SChris Mason *skip = extent_map_end(em); 1235940100a4SChris Mason *defrag_end = 0; 1236940100a4SChris Mason } 1237940100a4SChris Mason 1238940100a4SChris Mason free_extent_map(em); 1239940100a4SChris Mason return ret; 1240940100a4SChris Mason } 1241940100a4SChris Mason 12424cb5300bSChris Mason /* 12434cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 12444cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 12454cb5300bSChris Mason * to COW and defrag. 12464cb5300bSChris Mason * 12474cb5300bSChris Mason * It also makes sure the delalloc code has enough 12484cb5300bSChris Mason * dirty data to avoid making new small extents as part 12494cb5300bSChris Mason * of the defrag 12504cb5300bSChris Mason * 12514cb5300bSChris Mason * It's a good idea to start RA on this range 12524cb5300bSChris Mason * before calling this. 12534cb5300bSChris Mason */ 12544cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 12554cb5300bSChris Mason struct page **pages, 12564cb5300bSChris Mason unsigned long start_index, 1257c41570c9SJustin Maggard unsigned long num_pages) 1258f46b5a66SChristoph Hellwig { 12594cb5300bSChris Mason unsigned long file_end; 12604cb5300bSChris Mason u64 isize = i_size_read(inode); 1261f46b5a66SChristoph Hellwig u64 page_start; 1262f46b5a66SChristoph Hellwig u64 page_end; 12631f12bd06SLiu Bo u64 page_cnt; 12644cb5300bSChris Mason int ret; 12654cb5300bSChris Mason int i; 12664cb5300bSChris Mason int i_done; 12674cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 12684cb5300bSChris Mason struct extent_state *cached_state = NULL; 1269600a45e1SMiao Xie struct extent_io_tree *tree; 1270364ecf36SQu Wenruo struct extent_changeset *data_reserved = NULL; 12713b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 12724cb5300bSChris Mason 127309cbfeafSKirill A. Shutemov file_end = (isize - 1) >> PAGE_SHIFT; 12741f12bd06SLiu Bo if (!isize || start_index > file_end) 12751f12bd06SLiu Bo return 0; 12761f12bd06SLiu Bo 12771f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 12784cb5300bSChris Mason 1279e5b7231eSNikolay Borisov ret = btrfs_delalloc_reserve_space(BTRFS_I(inode), &data_reserved, 128009cbfeafSKirill A. Shutemov start_index << PAGE_SHIFT, 128109cbfeafSKirill A. Shutemov page_cnt << PAGE_SHIFT); 12824cb5300bSChris Mason if (ret) 12834cb5300bSChris Mason return ret; 12844cb5300bSChris Mason i_done = 0; 1285600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 12864cb5300bSChris Mason 12874cb5300bSChris Mason /* step one, lock all the pages */ 12881f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 12894cb5300bSChris Mason struct page *page; 1290600a45e1SMiao Xie again: 1291a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 12923b16a4e3SJosef Bacik start_index + i, mask); 12934cb5300bSChris Mason if (!page) 12944cb5300bSChris Mason break; 12954cb5300bSChris Mason 1296600a45e1SMiao Xie page_start = page_offset(page); 129709cbfeafSKirill A. Shutemov page_end = page_start + PAGE_SIZE - 1; 1298600a45e1SMiao Xie while (1) { 1299308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1300ff13db41SDavid Sterba &cached_state); 1301c3504372SNikolay Borisov ordered = btrfs_lookup_ordered_extent(BTRFS_I(inode), 1302600a45e1SMiao Xie page_start); 1303308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1304e43bbe5eSDavid Sterba &cached_state); 1305600a45e1SMiao Xie if (!ordered) 1306600a45e1SMiao Xie break; 1307600a45e1SMiao Xie 1308600a45e1SMiao Xie unlock_page(page); 1309600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1310600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1311600a45e1SMiao Xie lock_page(page); 13121f12bd06SLiu Bo /* 13131f12bd06SLiu Bo * we unlocked the page above, so we need check if 13141f12bd06SLiu Bo * it was released or not. 13151f12bd06SLiu Bo */ 13161f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 13171f12bd06SLiu Bo unlock_page(page); 131809cbfeafSKirill A. Shutemov put_page(page); 13191f12bd06SLiu Bo goto again; 13201f12bd06SLiu Bo } 1321600a45e1SMiao Xie } 1322600a45e1SMiao Xie 13234cb5300bSChris Mason if (!PageUptodate(page)) { 13244cb5300bSChris Mason btrfs_readpage(NULL, page); 13254cb5300bSChris Mason lock_page(page); 13264cb5300bSChris Mason if (!PageUptodate(page)) { 13274cb5300bSChris Mason unlock_page(page); 132809cbfeafSKirill A. Shutemov put_page(page); 13294cb5300bSChris Mason ret = -EIO; 13304cb5300bSChris Mason break; 13314cb5300bSChris Mason } 13324cb5300bSChris Mason } 1333600a45e1SMiao Xie 1334600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1335600a45e1SMiao Xie unlock_page(page); 133609cbfeafSKirill A. Shutemov put_page(page); 1337600a45e1SMiao Xie goto again; 1338600a45e1SMiao Xie } 1339600a45e1SMiao Xie 13404cb5300bSChris Mason pages[i] = page; 13414cb5300bSChris Mason i_done++; 13424cb5300bSChris Mason } 13434cb5300bSChris Mason if (!i_done || ret) 13444cb5300bSChris Mason goto out; 13454cb5300bSChris Mason 13461751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 13474cb5300bSChris Mason goto out; 13484cb5300bSChris Mason 13494cb5300bSChris Mason /* 13504cb5300bSChris Mason * so now we have a nice long stream of locked 13514cb5300bSChris Mason * and up to date pages, lets wait on them 13524cb5300bSChris Mason */ 13534cb5300bSChris Mason for (i = 0; i < i_done; i++) 13544cb5300bSChris Mason wait_on_page_writeback(pages[i]); 13554cb5300bSChris Mason 13564cb5300bSChris Mason page_start = page_offset(pages[0]); 135709cbfeafSKirill A. Shutemov page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE; 13584cb5300bSChris Mason 13594cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1360ff13db41SDavid Sterba page_start, page_end - 1, &cached_state); 13614cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 1362e182163dSOmar Sandoval page_end - 1, EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 1363e182163dSOmar Sandoval EXTENT_DEFRAG, 0, 0, &cached_state); 13644cb5300bSChris Mason 13651f12bd06SLiu Bo if (i_done != page_cnt) { 13669e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 136728c4a3e2SSu Yue btrfs_mod_outstanding_extents(BTRFS_I(inode), 1); 13689e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 136986d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 137009cbfeafSKirill A. Shutemov start_index << PAGE_SHIFT, 137143b18595SQu Wenruo (page_cnt - i_done) << PAGE_SHIFT, true); 13724cb5300bSChris Mason } 13734cb5300bSChris Mason 13744cb5300bSChris Mason 13759e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 1376018ed4f7SDavid Sterba &cached_state); 13774cb5300bSChris Mason 13784cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 1379e43bbe5eSDavid Sterba page_start, page_end - 1, &cached_state); 13804cb5300bSChris Mason 13814cb5300bSChris Mason for (i = 0; i < i_done; i++) { 13824cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 13834cb5300bSChris Mason ClearPageChecked(pages[i]); 13844cb5300bSChris Mason set_page_extent_mapped(pages[i]); 13854cb5300bSChris Mason set_page_dirty(pages[i]); 13864cb5300bSChris Mason unlock_page(pages[i]); 138709cbfeafSKirill A. Shutemov put_page(pages[i]); 13884cb5300bSChris Mason } 13898702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1390364ecf36SQu Wenruo extent_changeset_free(data_reserved); 13914cb5300bSChris Mason return i_done; 13924cb5300bSChris Mason out: 13934cb5300bSChris Mason for (i = 0; i < i_done; i++) { 13944cb5300bSChris Mason unlock_page(pages[i]); 139509cbfeafSKirill A. Shutemov put_page(pages[i]); 13964cb5300bSChris Mason } 139786d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 139809cbfeafSKirill A. Shutemov start_index << PAGE_SHIFT, 139943b18595SQu Wenruo page_cnt << PAGE_SHIFT, true); 14008702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1401364ecf36SQu Wenruo extent_changeset_free(data_reserved); 14024cb5300bSChris Mason return ret; 14034cb5300bSChris Mason 14044cb5300bSChris Mason } 14054cb5300bSChris Mason 14064cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 14074cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 14084cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 14094cb5300bSChris Mason { 14100b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 14114cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 14124cb5300bSChris Mason struct file_ra_state *ra = NULL; 14134cb5300bSChris Mason unsigned long last_index; 1414151a31b2SLi Zefan u64 isize = i_size_read(inode); 1415940100a4SChris Mason u64 last_len = 0; 1416940100a4SChris Mason u64 skip = 0; 1417940100a4SChris Mason u64 defrag_end = 0; 14184cb5300bSChris Mason u64 newer_off = range->start; 1419f46b5a66SChristoph Hellwig unsigned long i; 1420008873eaSLi Zefan unsigned long ra_index = 0; 1421f46b5a66SChristoph Hellwig int ret; 14224cb5300bSChris Mason int defrag_count = 0; 14231a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1424aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 142509cbfeafSKirill A. Shutemov unsigned long max_cluster = SZ_256K >> PAGE_SHIFT; 1426c41570c9SJustin Maggard unsigned long cluster = max_cluster; 1427ee22184bSByongho Lee u64 new_align = ~((u64)SZ_128K - 1); 14284cb5300bSChris Mason struct page **pages = NULL; 14291e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 14304cb5300bSChris Mason 14310abd5b17SLiu Bo if (isize == 0) 14320abd5b17SLiu Bo return 0; 14330abd5b17SLiu Bo 14340abd5b17SLiu Bo if (range->start >= isize) 14350abd5b17SLiu Bo return -EINVAL; 14361a419d85SLi Zefan 14371e2ef46dSDavid Sterba if (do_compress) { 1438ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 14391a419d85SLi Zefan return -EINVAL; 14401a419d85SLi Zefan if (range->compress_type) 14411a419d85SLi Zefan compress_type = range->compress_type; 14421a419d85SLi Zefan } 1443f46b5a66SChristoph Hellwig 14440abd5b17SLiu Bo if (extent_thresh == 0) 1445ee22184bSByongho Lee extent_thresh = SZ_256K; 1446f46b5a66SChristoph Hellwig 14474cb5300bSChris Mason /* 14480a52d108SDavid Sterba * If we were not given a file, allocate a readahead context. As 14490a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 14500a52d108SDavid Sterba * we don't error out. 14514cb5300bSChris Mason */ 14524cb5300bSChris Mason if (!file) { 145363e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 14540a52d108SDavid Sterba if (ra) 14554cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 14564cb5300bSChris Mason } else { 14574cb5300bSChris Mason ra = &file->f_ra; 14584cb5300bSChris Mason } 14594cb5300bSChris Mason 146063e727ecSDavid Sterba pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL); 14614cb5300bSChris Mason if (!pages) { 14624cb5300bSChris Mason ret = -ENOMEM; 14634cb5300bSChris Mason goto out_ra; 14644cb5300bSChris Mason } 14654cb5300bSChris Mason 14664cb5300bSChris Mason /* find the last page to defrag */ 14671e701a32SChris Mason if (range->start + range->len > range->start) { 1468151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 146909cbfeafSKirill A. Shutemov range->start + range->len - 1) >> PAGE_SHIFT; 14701e701a32SChris Mason } else { 147109cbfeafSKirill A. Shutemov last_index = (isize - 1) >> PAGE_SHIFT; 14721e701a32SChris Mason } 14731e701a32SChris Mason 14744cb5300bSChris Mason if (newer_than) { 14754cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 1476ee22184bSByongho Lee &newer_off, SZ_64K); 14774cb5300bSChris Mason if (!ret) { 14784cb5300bSChris Mason range->start = newer_off; 14794cb5300bSChris Mason /* 14804cb5300bSChris Mason * we always align our defrag to help keep 14814cb5300bSChris Mason * the extents in the file evenly spaced 14824cb5300bSChris Mason */ 148309cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 14844cb5300bSChris Mason } else 14854cb5300bSChris Mason goto out_ra; 14864cb5300bSChris Mason } else { 148709cbfeafSKirill A. Shutemov i = range->start >> PAGE_SHIFT; 14884cb5300bSChris Mason } 14894cb5300bSChris Mason if (!max_to_defrag) 1490070034bdSchandan max_to_defrag = last_index - i + 1; 14914cb5300bSChris Mason 14922a0f7f57SLi Zefan /* 14932a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 14942a0f7f57SLi Zefan * written sequentially. 14952a0f7f57SLi Zefan */ 14962a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 14972a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 14982a0f7f57SLi Zefan 1499f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 150009cbfeafSKirill A. Shutemov (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) { 15014cb5300bSChris Mason /* 15024cb5300bSChris Mason * make sure we stop running if someone unmounts 15034cb5300bSChris Mason * the FS 15044cb5300bSChris Mason */ 15051751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 15064cb5300bSChris Mason break; 15074cb5300bSChris Mason 15080b246afaSJeff Mahoney if (btrfs_defrag_cancelled(fs_info)) { 15090b246afaSJeff Mahoney btrfs_debug(fs_info, "defrag_file cancelled"); 1510210549ebSDavid Sterba ret = -EAGAIN; 1511210549ebSDavid Sterba break; 1512210549ebSDavid Sterba } 1513210549ebSDavid Sterba 151409cbfeafSKirill A. Shutemov if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT, 15156c282eb4SLi Zefan extent_thresh, &last_len, &skip, 15161e2ef46dSDavid Sterba &defrag_end, do_compress)){ 1517940100a4SChris Mason unsigned long next; 1518940100a4SChris Mason /* 1519940100a4SChris Mason * the should_defrag function tells us how much to skip 1520940100a4SChris Mason * bump our counter by the suggested amount 1521940100a4SChris Mason */ 152209cbfeafSKirill A. Shutemov next = DIV_ROUND_UP(skip, PAGE_SIZE); 1523940100a4SChris Mason i = max(i + 1, next); 1524940100a4SChris Mason continue; 1525940100a4SChris Mason } 1526008873eaSLi Zefan 1527008873eaSLi Zefan if (!newer_than) { 152809cbfeafSKirill A. Shutemov cluster = (PAGE_ALIGN(defrag_end) >> 152909cbfeafSKirill A. Shutemov PAGE_SHIFT) - i; 1530008873eaSLi Zefan cluster = min(cluster, max_cluster); 1531008873eaSLi Zefan } else { 1532008873eaSLi Zefan cluster = max_cluster; 1533008873eaSLi Zefan } 1534008873eaSLi Zefan 1535008873eaSLi Zefan if (i + cluster > ra_index) { 1536008873eaSLi Zefan ra_index = max(i, ra_index); 15370a52d108SDavid Sterba if (ra) 1538d3c0bab5SDavid Sterba page_cache_sync_readahead(inode->i_mapping, ra, 1539d3c0bab5SDavid Sterba file, ra_index, cluster); 1540e4826a5bSchandan ra_index += cluster; 1541008873eaSLi Zefan } 15424cb5300bSChris Mason 15435955102cSAl Viro inode_lock(inode); 1544eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1545eede2bf3SOmar Sandoval ret = -ETXTBSY; 1546eede2bf3SOmar Sandoval } else { 15471e2ef46dSDavid Sterba if (do_compress) 1548eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 1549008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1550eede2bf3SOmar Sandoval } 1551ecb8bea8SLiu Bo if (ret < 0) { 15525955102cSAl Viro inode_unlock(inode); 15534cb5300bSChris Mason goto out_ra; 1554ecb8bea8SLiu Bo } 15554cb5300bSChris Mason 15564cb5300bSChris Mason defrag_count += ret; 1557d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 15585955102cSAl Viro inode_unlock(inode); 15594cb5300bSChris Mason 15604cb5300bSChris Mason if (newer_than) { 15614cb5300bSChris Mason if (newer_off == (u64)-1) 15624cb5300bSChris Mason break; 15634cb5300bSChris Mason 1564e1f041e1SLiu Bo if (ret > 0) 1565e1f041e1SLiu Bo i += ret; 1566e1f041e1SLiu Bo 15674cb5300bSChris Mason newer_off = max(newer_off + 1, 156809cbfeafSKirill A. Shutemov (u64)i << PAGE_SHIFT); 15694cb5300bSChris Mason 1570ee22184bSByongho Lee ret = find_new_extents(root, inode, newer_than, 1571ee22184bSByongho Lee &newer_off, SZ_64K); 15724cb5300bSChris Mason if (!ret) { 15734cb5300bSChris Mason range->start = newer_off; 157409cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 15754cb5300bSChris Mason } else { 15764cb5300bSChris Mason break; 1577940100a4SChris Mason } 15784cb5300bSChris Mason } else { 1579008873eaSLi Zefan if (ret > 0) { 1580cbcc8326SLi Zefan i += ret; 158109cbfeafSKirill A. Shutemov last_len += ret << PAGE_SHIFT; 1582008873eaSLi Zefan } else { 1583940100a4SChris Mason i++; 1584008873eaSLi Zefan last_len = 0; 1585008873eaSLi Zefan } 1586f46b5a66SChristoph Hellwig } 15874cb5300bSChris Mason } 1588f46b5a66SChristoph Hellwig 1589dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 15901e701a32SChris Mason filemap_flush(inode->i_mapping); 1591dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1592dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1593dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1594dec8ef90SFilipe Manana } 15951e701a32SChris Mason 15961a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 15970b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 15985c1aab1dSNick Terrell } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) { 15995c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 16001a419d85SLi Zefan } 16011a419d85SLi Zefan 160260ccf82fSDiego Calleja ret = defrag_count; 1603940100a4SChris Mason 16044cb5300bSChris Mason out_ra: 16051e2ef46dSDavid Sterba if (do_compress) { 16065955102cSAl Viro inode_lock(inode); 1607eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 16085955102cSAl Viro inode_unlock(inode); 1609633085c7SFilipe David Borba Manana } 16104cb5300bSChris Mason if (!file) 16114cb5300bSChris Mason kfree(ra); 16124cb5300bSChris Mason kfree(pages); 1613940100a4SChris Mason return ret; 1614f46b5a66SChristoph Hellwig } 1615f46b5a66SChristoph Hellwig 1616198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 161776dda93cSYan, Zheng void __user *arg) 1618f46b5a66SChristoph Hellwig { 16190b246afaSJeff Mahoney struct inode *inode = file_inode(file); 16200b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1621f46b5a66SChristoph Hellwig u64 new_size; 1622f46b5a66SChristoph Hellwig u64 old_size; 1623f46b5a66SChristoph Hellwig u64 devid = 1; 16240b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1625f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1626f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1627f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1628f46b5a66SChristoph Hellwig char *sizestr; 16299a40f122SGui Hecheng char *retptr; 1630f46b5a66SChristoph Hellwig char *devstr = NULL; 1631f46b5a66SChristoph Hellwig int ret = 0; 1632f46b5a66SChristoph Hellwig int mod = 0; 1633f46b5a66SChristoph Hellwig 1634e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1635e441d54dSChris Mason return -EPERM; 1636e441d54dSChris Mason 1637198605a8SMiao Xie ret = mnt_want_write_file(file); 1638198605a8SMiao Xie if (ret) 1639198605a8SMiao Xie return ret; 1640198605a8SMiao Xie 1641171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 164297547676SMiao Xie mnt_drop_write_file(file); 1643e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1644c9e9f97bSIlya Dryomov } 1645c9e9f97bSIlya Dryomov 1646dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1647c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1648c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1649c9e9f97bSIlya Dryomov goto out; 1650c9e9f97bSIlya Dryomov } 16515516e595SMark Fasheh 16525516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1653f46b5a66SChristoph Hellwig 1654f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1655f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1656f46b5a66SChristoph Hellwig if (devstr) { 1657f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1658f46b5a66SChristoph Hellwig *devstr = '\0'; 1659f46b5a66SChristoph Hellwig devstr = vol_args->name; 166058dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 166158dfae63SZhangZhen if (ret) 166258dfae63SZhangZhen goto out_free; 1663dfd79829SMiao Xie if (!devid) { 1664dfd79829SMiao Xie ret = -EINVAL; 1665dfd79829SMiao Xie goto out_free; 1666dfd79829SMiao Xie } 16670b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1668f46b5a66SChristoph Hellwig } 1669dba60f3fSMiao Xie 167009ba3bc9SAnand Jain device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL, true); 1671f46b5a66SChristoph Hellwig if (!device) { 16720b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1673c1c9ff7cSGeert Uytterhoeven devid); 1674dfd79829SMiao Xie ret = -ENODEV; 1675c9e9f97bSIlya Dryomov goto out_free; 1676f46b5a66SChristoph Hellwig } 1677dba60f3fSMiao Xie 1678ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 16790b246afaSJeff Mahoney btrfs_info(fs_info, 1680efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1681c1c9ff7cSGeert Uytterhoeven devid); 1682dfd79829SMiao Xie ret = -EPERM; 16834e42ae1bSLiu Bo goto out_free; 16844e42ae1bSLiu Bo } 16854e42ae1bSLiu Bo 1686f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1687f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1688f46b5a66SChristoph Hellwig else { 1689f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1690f46b5a66SChristoph Hellwig mod = -1; 1691f46b5a66SChristoph Hellwig sizestr++; 1692f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1693f46b5a66SChristoph Hellwig mod = 1; 1694f46b5a66SChristoph Hellwig sizestr++; 1695f46b5a66SChristoph Hellwig } 16969a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 16979a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1698f46b5a66SChristoph Hellwig ret = -EINVAL; 1699c9e9f97bSIlya Dryomov goto out_free; 1700f46b5a66SChristoph Hellwig } 1701f46b5a66SChristoph Hellwig } 1702f46b5a66SChristoph Hellwig 1703401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1704dfd79829SMiao Xie ret = -EPERM; 170563a212abSStefan Behrens goto out_free; 170663a212abSStefan Behrens } 170763a212abSStefan Behrens 17087cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1709f46b5a66SChristoph Hellwig 1710f46b5a66SChristoph Hellwig if (mod < 0) { 1711f46b5a66SChristoph Hellwig if (new_size > old_size) { 1712f46b5a66SChristoph Hellwig ret = -EINVAL; 1713c9e9f97bSIlya Dryomov goto out_free; 1714f46b5a66SChristoph Hellwig } 1715f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1716f46b5a66SChristoph Hellwig } else if (mod > 0) { 1717eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1718902c68a4SGui Hecheng ret = -ERANGE; 1719eb8052e0SWenliang Fan goto out_free; 1720eb8052e0SWenliang Fan } 1721f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1722f46b5a66SChristoph Hellwig } 1723f46b5a66SChristoph Hellwig 1724ee22184bSByongho Lee if (new_size < SZ_256M) { 1725f46b5a66SChristoph Hellwig ret = -EINVAL; 1726c9e9f97bSIlya Dryomov goto out_free; 1727f46b5a66SChristoph Hellwig } 1728f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1729f46b5a66SChristoph Hellwig ret = -EFBIG; 1730c9e9f97bSIlya Dryomov goto out_free; 1731f46b5a66SChristoph Hellwig } 1732f46b5a66SChristoph Hellwig 173347f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1734f46b5a66SChristoph Hellwig 1735f46b5a66SChristoph Hellwig if (new_size > old_size) { 1736a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 173798d5dc13STsutomu Itoh if (IS_ERR(trans)) { 173898d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1739c9e9f97bSIlya Dryomov goto out_free; 174098d5dc13STsutomu Itoh } 1741f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 17423a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1743ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1744f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 17450253f40eSjeff.liu } /* equal, nothing need to do */ 1746f46b5a66SChristoph Hellwig 1747faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1748faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1749faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1750faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 1751faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1752c9e9f97bSIlya Dryomov out_free: 1753f46b5a66SChristoph Hellwig kfree(vol_args); 1754c9e9f97bSIlya Dryomov out: 1755171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 175618f39c41SIlya Dryomov mnt_drop_write_file(file); 1757f46b5a66SChristoph Hellwig return ret; 1758f46b5a66SChristoph Hellwig } 1759f46b5a66SChristoph Hellwig 17605d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 176152f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 17625d54c67eSNikolay Borisov bool readonly, 17638696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1764f46b5a66SChristoph Hellwig { 1765f46b5a66SChristoph Hellwig int namelen; 17663de4586cSChris Mason int ret = 0; 1767f46b5a66SChristoph Hellwig 1768325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1769325c50e3SJeff Mahoney return -ENOTDIR; 1770325c50e3SJeff Mahoney 1771a874a63eSLiu Bo ret = mnt_want_write_file(file); 1772a874a63eSLiu Bo if (ret) 1773a874a63eSLiu Bo goto out; 1774a874a63eSLiu Bo 177572fd032eSSage Weil namelen = strlen(name); 177672fd032eSSage Weil if (strchr(name, '/')) { 1777f46b5a66SChristoph Hellwig ret = -EINVAL; 1778a874a63eSLiu Bo goto out_drop_write; 1779f46b5a66SChristoph Hellwig } 1780f46b5a66SChristoph Hellwig 178116780cabSChris Mason if (name[0] == '.' && 178216780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 178316780cabSChris Mason ret = -EEXIST; 1784a874a63eSLiu Bo goto out_drop_write; 178516780cabSChris Mason } 178616780cabSChris Mason 17873de4586cSChris Mason if (subvol) { 178872fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 17895d54c67eSNikolay Borisov NULL, readonly, inherit); 1790cb8e7090SChristoph Hellwig } else { 17912903ff01SAl Viro struct fd src = fdget(fd); 17923de4586cSChris Mason struct inode *src_inode; 17932903ff01SAl Viro if (!src.file) { 17943de4586cSChris Mason ret = -EINVAL; 1795a874a63eSLiu Bo goto out_drop_write; 17963de4586cSChris Mason } 17973de4586cSChris Mason 1798496ad9aaSAl Viro src_inode = file_inode(src.file); 1799496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1800c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1801efe120a0SFrank Holton "Snapshot src from another FS"); 180223ad5b17SKusanagi Kouichi ret = -EXDEV; 1803d0242061SDavid Sterba } else if (!inode_owner_or_capable(src_inode)) { 1804d0242061SDavid Sterba /* 1805d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1806d0242061SDavid Sterba * are limited to own subvolumes only 1807d0242061SDavid Sterba */ 1808d0242061SDavid Sterba ret = -EPERM; 1809ecd18815SAl Viro } else { 1810c11fbb6eSRobbie Ko ret = btrfs_mksnapshot(&file->f_path, name, namelen, 181172fd032eSSage Weil BTRFS_I(src_inode)->root, 18125d54c67eSNikolay Borisov readonly, inherit); 1813ecd18815SAl Viro } 18142903ff01SAl Viro fdput(src); 1815cb8e7090SChristoph Hellwig } 1816a874a63eSLiu Bo out_drop_write: 1817a874a63eSLiu Bo mnt_drop_write_file(file); 1818f46b5a66SChristoph Hellwig out: 181972fd032eSSage Weil return ret; 182072fd032eSSage Weil } 182172fd032eSSage Weil 182272fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1823fa0d2b9bSLi Zefan void __user *arg, int subvol) 182472fd032eSSage Weil { 1825fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 182672fd032eSSage Weil int ret; 182772fd032eSSage Weil 1828325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1829325c50e3SJeff Mahoney return -ENOTDIR; 1830325c50e3SJeff Mahoney 1831fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1832fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1833fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1834fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1835fa0d2b9bSLi Zefan 18365d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 18375d54c67eSNikolay Borisov subvol, false, NULL); 1838fa0d2b9bSLi Zefan 1839fa0d2b9bSLi Zefan kfree(vol_args); 1840fa0d2b9bSLi Zefan return ret; 1841fa0d2b9bSLi Zefan } 1842fa0d2b9bSLi Zefan 1843fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1844fa0d2b9bSLi Zefan void __user *arg, int subvol) 1845fa0d2b9bSLi Zefan { 1846fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1847fa0d2b9bSLi Zefan int ret; 1848b83cc969SLi Zefan bool readonly = false; 18496f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 185072fd032eSSage Weil 1851325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1852325c50e3SJeff Mahoney return -ENOTDIR; 1853325c50e3SJeff Mahoney 1854fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1855fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1856fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1857fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1858fdfb1e4fSLi Zefan 1859673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 1860b83cc969SLi Zefan ret = -EOPNOTSUPP; 1861c47ca32dSDan Carpenter goto free_args; 1862fdfb1e4fSLi Zefan } 1863fdfb1e4fSLi Zefan 1864b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1865b83cc969SLi Zefan readonly = true; 18666f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 186709cbfeafSKirill A. Shutemov if (vol_args->size > PAGE_SIZE) { 18686f72c7e2SArne Jansen ret = -EINVAL; 1869c47ca32dSDan Carpenter goto free_args; 18706f72c7e2SArne Jansen } 18716f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 18726f72c7e2SArne Jansen if (IS_ERR(inherit)) { 18736f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1874c47ca32dSDan Carpenter goto free_args; 18756f72c7e2SArne Jansen } 18766f72c7e2SArne Jansen } 187775eaa0e2SSage Weil 18785d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 18795d54c67eSNikolay Borisov subvol, readonly, inherit); 1880c47ca32dSDan Carpenter if (ret) 1881c47ca32dSDan Carpenter goto free_inherit; 1882c47ca32dSDan Carpenter free_inherit: 18836f72c7e2SArne Jansen kfree(inherit); 1884c47ca32dSDan Carpenter free_args: 1885c47ca32dSDan Carpenter kfree(vol_args); 1886f46b5a66SChristoph Hellwig return ret; 1887f46b5a66SChristoph Hellwig } 1888f46b5a66SChristoph Hellwig 18890caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 18900caa102dSLi Zefan void __user *arg) 18910caa102dSLi Zefan { 1892496ad9aaSAl Viro struct inode *inode = file_inode(file); 18930b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 18940caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 18950caa102dSLi Zefan int ret = 0; 18960caa102dSLi Zefan u64 flags = 0; 18970caa102dSLi Zefan 18984a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 18990caa102dSLi Zefan return -EINVAL; 19000caa102dSLi Zefan 19010b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 19020caa102dSLi Zefan if (btrfs_root_readonly(root)) 19030caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 19040b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 19050caa102dSLi Zefan 19060caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 19070caa102dSLi Zefan ret = -EFAULT; 19080caa102dSLi Zefan 19090caa102dSLi Zefan return ret; 19100caa102dSLi Zefan } 19110caa102dSLi Zefan 19120caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 19130caa102dSLi Zefan void __user *arg) 19140caa102dSLi Zefan { 1915496ad9aaSAl Viro struct inode *inode = file_inode(file); 19160b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 19170caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 19180caa102dSLi Zefan struct btrfs_trans_handle *trans; 19190caa102dSLi Zefan u64 root_flags; 19200caa102dSLi Zefan u64 flags; 19210caa102dSLi Zefan int ret = 0; 19220caa102dSLi Zefan 1923bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 1924bd60ea0fSDavid Sterba return -EPERM; 1925bd60ea0fSDavid Sterba 1926b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1927b9ca0664SLiu Bo if (ret) 1928b9ca0664SLiu Bo goto out; 19290caa102dSLi Zefan 19304a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 1931b9ca0664SLiu Bo ret = -EINVAL; 1932b9ca0664SLiu Bo goto out_drop_write; 1933b9ca0664SLiu Bo } 19340caa102dSLi Zefan 1935b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1936b9ca0664SLiu Bo ret = -EFAULT; 1937b9ca0664SLiu Bo goto out_drop_write; 1938b9ca0664SLiu Bo } 19390caa102dSLi Zefan 1940b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1941b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1942b9ca0664SLiu Bo goto out_drop_write; 1943b9ca0664SLiu Bo } 19440caa102dSLi Zefan 19450b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 19460caa102dSLi Zefan 19470caa102dSLi Zefan /* nothing to do */ 19480caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1949b9ca0664SLiu Bo goto out_drop_sem; 19500caa102dSLi Zefan 19510caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 19522c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 19530caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 19540caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 19552c686537SDavid Sterba } else { 19562c686537SDavid Sterba /* 19572c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 19582c686537SDavid Sterba * send 19592c686537SDavid Sterba */ 19602c686537SDavid Sterba spin_lock(&root->root_item_lock); 19612c686537SDavid Sterba if (root->send_in_progress == 0) { 19620caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 19630caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 19642c686537SDavid Sterba spin_unlock(&root->root_item_lock); 19652c686537SDavid Sterba } else { 19662c686537SDavid Sterba spin_unlock(&root->root_item_lock); 19670b246afaSJeff Mahoney btrfs_warn(fs_info, 19682c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 19692c686537SDavid Sterba root->root_key.objectid); 19702c686537SDavid Sterba ret = -EPERM; 19712c686537SDavid Sterba goto out_drop_sem; 19722c686537SDavid Sterba } 19732c686537SDavid Sterba } 19740caa102dSLi Zefan 19750caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 19760caa102dSLi Zefan if (IS_ERR(trans)) { 19770caa102dSLi Zefan ret = PTR_ERR(trans); 19780caa102dSLi Zefan goto out_reset; 19790caa102dSLi Zefan } 19800caa102dSLi Zefan 19810b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 19820caa102dSLi Zefan &root->root_key, &root->root_item); 19839417ebc8SNikolay Borisov if (ret < 0) { 19849417ebc8SNikolay Borisov btrfs_end_transaction(trans); 19859417ebc8SNikolay Borisov goto out_reset; 19869417ebc8SNikolay Borisov } 19870caa102dSLi Zefan 19889417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 19899417ebc8SNikolay Borisov 19900caa102dSLi Zefan out_reset: 19910caa102dSLi Zefan if (ret) 19920caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1993b9ca0664SLiu Bo out_drop_sem: 19940b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 1995b9ca0664SLiu Bo out_drop_write: 1996b9ca0664SLiu Bo mnt_drop_write_file(file); 1997b9ca0664SLiu Bo out: 19980caa102dSLi Zefan return ret; 19990caa102dSLi Zefan } 20000caa102dSLi Zefan 2001ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 2002ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 2003ac8e9819SChris Mason { 2004abc6e134SChris Mason struct btrfs_key test; 2005abc6e134SChris Mason int ret; 2006abc6e134SChris Mason 2007abc6e134SChris Mason test.objectid = sk->min_objectid; 2008abc6e134SChris Mason test.type = sk->min_type; 2009abc6e134SChris Mason test.offset = sk->min_offset; 2010abc6e134SChris Mason 2011abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2012abc6e134SChris Mason if (ret < 0) 2013ac8e9819SChris Mason return 0; 2014abc6e134SChris Mason 2015abc6e134SChris Mason test.objectid = sk->max_objectid; 2016abc6e134SChris Mason test.type = sk->max_type; 2017abc6e134SChris Mason test.offset = sk->max_offset; 2018abc6e134SChris Mason 2019abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2020abc6e134SChris Mason if (ret > 0) 2021ac8e9819SChris Mason return 0; 2022ac8e9819SChris Mason return 1; 2023ac8e9819SChris Mason } 2024ac8e9819SChris Mason 2025df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2026ac8e9819SChris Mason struct btrfs_key *key, 2027ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 20289b6e817dSGerhard Heift size_t *buf_size, 2029ba346b35SGerhard Heift char __user *ubuf, 2030ac8e9819SChris Mason unsigned long *sk_offset, 2031ac8e9819SChris Mason int *num_found) 2032ac8e9819SChris Mason { 2033ac8e9819SChris Mason u64 found_transid; 2034ac8e9819SChris Mason struct extent_buffer *leaf; 2035ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2036dd81d459SNaohiro Aota struct btrfs_key test; 2037ac8e9819SChris Mason unsigned long item_off; 2038ac8e9819SChris Mason unsigned long item_len; 2039ac8e9819SChris Mason int nritems; 2040ac8e9819SChris Mason int i; 2041ac8e9819SChris Mason int slot; 2042ac8e9819SChris Mason int ret = 0; 2043ac8e9819SChris Mason 2044ac8e9819SChris Mason leaf = path->nodes[0]; 2045ac8e9819SChris Mason slot = path->slots[0]; 2046ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2047ac8e9819SChris Mason 2048ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2049ac8e9819SChris Mason i = nritems; 2050ac8e9819SChris Mason goto advance_key; 2051ac8e9819SChris Mason } 2052ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2053ac8e9819SChris Mason 2054ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2055ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 2056ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 2057ac8e9819SChris Mason 205803b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 205903b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 206003b71c6cSGabriel de Perthuis continue; 206103b71c6cSGabriel de Perthuis 20629b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 20638f5f6178SGerhard Heift if (*num_found) { 2064ac8e9819SChris Mason ret = 1; 20658f5f6178SGerhard Heift goto out; 20668f5f6178SGerhard Heift } 20678f5f6178SGerhard Heift 20688f5f6178SGerhard Heift /* 20698f5f6178SGerhard Heift * return one empty item back for v1, which does not 20708f5f6178SGerhard Heift * handle -EOVERFLOW 20718f5f6178SGerhard Heift */ 20728f5f6178SGerhard Heift 20739b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2074ac8e9819SChris Mason item_len = 0; 20758f5f6178SGerhard Heift ret = -EOVERFLOW; 20768f5f6178SGerhard Heift } 2077ac8e9819SChris Mason 20789b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2079ac8e9819SChris Mason ret = 1; 208025c9bc2eSGerhard Heift goto out; 2081ac8e9819SChris Mason } 2082ac8e9819SChris Mason 2083ac8e9819SChris Mason sh.objectid = key->objectid; 2084ac8e9819SChris Mason sh.offset = key->offset; 2085ac8e9819SChris Mason sh.type = key->type; 2086ac8e9819SChris Mason sh.len = item_len; 2087ac8e9819SChris Mason sh.transid = found_transid; 2088ac8e9819SChris Mason 2089a48b73ecSJosef Bacik /* 2090a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 2091a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 2092a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 2093a48b73ecSJosef Bacik * properly this next time through 2094a48b73ecSJosef Bacik */ 2095a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 2096a48b73ecSJosef Bacik ret = 0; 2097ba346b35SGerhard Heift goto out; 2098ba346b35SGerhard Heift } 2099ba346b35SGerhard Heift 2100ac8e9819SChris Mason *sk_offset += sizeof(sh); 2101ac8e9819SChris Mason 2102ac8e9819SChris Mason if (item_len) { 2103ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2104a48b73ecSJosef Bacik /* 2105a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 2106a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 2107a48b73ecSJosef Bacik */ 2108a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 2109ba346b35SGerhard Heift item_off, item_len)) { 2110a48b73ecSJosef Bacik ret = 0; 2111a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 2112ba346b35SGerhard Heift goto out; 2113ba346b35SGerhard Heift } 2114ba346b35SGerhard Heift 2115ac8e9819SChris Mason *sk_offset += item_len; 2116ac8e9819SChris Mason } 2117e2156867SHugo Mills (*num_found)++; 2118ac8e9819SChris Mason 21198f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 21208f5f6178SGerhard Heift goto out; 21218f5f6178SGerhard Heift 212225c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 212325c9bc2eSGerhard Heift ret = 1; 212425c9bc2eSGerhard Heift goto out; 212525c9bc2eSGerhard Heift } 2126ac8e9819SChris Mason } 2127ac8e9819SChris Mason advance_key: 2128ac8e9819SChris Mason ret = 0; 2129dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2130dd81d459SNaohiro Aota test.type = sk->max_type; 2131dd81d459SNaohiro Aota test.offset = sk->max_offset; 2132dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2133dd81d459SNaohiro Aota ret = 1; 2134dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2135abc6e134SChris Mason key->offset++; 2136dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2137abc6e134SChris Mason key->offset = 0; 2138abc6e134SChris Mason key->type++; 2139dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2140abc6e134SChris Mason key->offset = 0; 2141abc6e134SChris Mason key->type = 0; 2142abc6e134SChris Mason key->objectid++; 2143abc6e134SChris Mason } else 2144abc6e134SChris Mason ret = 1; 214525c9bc2eSGerhard Heift out: 2146ba346b35SGerhard Heift /* 2147ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2148ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2149ba346b35SGerhard Heift * * all items were found 2150ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2151ba346b35SGerhard Heift * leaf 2152ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2153ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2154ba346b35SGerhard Heift */ 2155ac8e9819SChris Mason return ret; 2156ac8e9819SChris Mason } 2157ac8e9819SChris Mason 2158ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 215912544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 21609b6e817dSGerhard Heift size_t *buf_size, 2161ba346b35SGerhard Heift char __user *ubuf) 2162ac8e9819SChris Mason { 21630b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2164ac8e9819SChris Mason struct btrfs_root *root; 2165ac8e9819SChris Mason struct btrfs_key key; 2166ac8e9819SChris Mason struct btrfs_path *path; 2167ac8e9819SChris Mason int ret; 2168ac8e9819SChris Mason int num_found = 0; 2169ac8e9819SChris Mason unsigned long sk_offset = 0; 2170ac8e9819SChris Mason 21719b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 21729b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 217312544442SGerhard Heift return -EOVERFLOW; 21749b6e817dSGerhard Heift } 217512544442SGerhard Heift 2176ac8e9819SChris Mason path = btrfs_alloc_path(); 2177ac8e9819SChris Mason if (!path) 2178ac8e9819SChris Mason return -ENOMEM; 2179ac8e9819SChris Mason 2180ac8e9819SChris Mason if (sk->tree_id == 0) { 2181ac8e9819SChris Mason /* search the root of the inode that was passed */ 218200246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2183ac8e9819SChris Mason } else { 218456e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2185ac8e9819SChris Mason if (IS_ERR(root)) { 2186ac8e9819SChris Mason btrfs_free_path(path); 2187ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2188ac8e9819SChris Mason } 2189ac8e9819SChris Mason } 2190ac8e9819SChris Mason 2191ac8e9819SChris Mason key.objectid = sk->min_objectid; 2192ac8e9819SChris Mason key.type = sk->min_type; 2193ac8e9819SChris Mason key.offset = sk->min_offset; 2194ac8e9819SChris Mason 2195ac8e9819SChris Mason while (1) { 2196a48b73ecSJosef Bacik ret = fault_in_pages_writeable(ubuf, *buf_size - sk_offset); 2197a48b73ecSJosef Bacik if (ret) 2198a48b73ecSJosef Bacik break; 2199a48b73ecSJosef Bacik 22006174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2201ac8e9819SChris Mason if (ret != 0) { 2202ac8e9819SChris Mason if (ret > 0) 2203ac8e9819SChris Mason ret = 0; 2204ac8e9819SChris Mason goto err; 2205ac8e9819SChris Mason } 2206df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2207ac8e9819SChris Mason &sk_offset, &num_found); 2208b3b4aa74SDavid Sterba btrfs_release_path(path); 220925c9bc2eSGerhard Heift if (ret) 2210ac8e9819SChris Mason break; 2211ac8e9819SChris Mason 2212ac8e9819SChris Mason } 22138f5f6178SGerhard Heift if (ret > 0) 2214ac8e9819SChris Mason ret = 0; 2215ac8e9819SChris Mason err: 2216ac8e9819SChris Mason sk->nr_items = num_found; 221700246528SJosef Bacik btrfs_put_root(root); 2218ac8e9819SChris Mason btrfs_free_path(path); 2219ac8e9819SChris Mason return ret; 2220ac8e9819SChris Mason } 2221ac8e9819SChris Mason 2222ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2223ac8e9819SChris Mason void __user *argp) 2224ac8e9819SChris Mason { 2225ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2226ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2227ac8e9819SChris Mason struct inode *inode; 2228ac8e9819SChris Mason int ret; 22299b6e817dSGerhard Heift size_t buf_size; 2230ac8e9819SChris Mason 2231ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2232ac8e9819SChris Mason return -EPERM; 2233ac8e9819SChris Mason 2234ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2235ac8e9819SChris Mason 2236ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2237ba346b35SGerhard Heift return -EFAULT; 2238ba346b35SGerhard Heift 2239ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2240ac8e9819SChris Mason 2241496ad9aaSAl Viro inode = file_inode(file); 2242ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 22438f5f6178SGerhard Heift 22448f5f6178SGerhard Heift /* 22458f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 22468f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 22478f5f6178SGerhard Heift */ 22488f5f6178SGerhard Heift if (ret == -EOVERFLOW) 22498f5f6178SGerhard Heift ret = 0; 22508f5f6178SGerhard Heift 2251ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2252ac8e9819SChris Mason ret = -EFAULT; 2253ac8e9819SChris Mason return ret; 2254ac8e9819SChris Mason } 2255ac8e9819SChris Mason 2256cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2257cc68a8a5SGerhard Heift void __user *argp) 2258cc68a8a5SGerhard Heift { 2259cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2260cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2261cc68a8a5SGerhard Heift struct inode *inode; 2262cc68a8a5SGerhard Heift int ret; 2263cc68a8a5SGerhard Heift size_t buf_size; 2264ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2265cc68a8a5SGerhard Heift 2266cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2267cc68a8a5SGerhard Heift return -EPERM; 2268cc68a8a5SGerhard Heift 2269cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2270cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2271cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2272cc68a8a5SGerhard Heift return -EFAULT; 2273cc68a8a5SGerhard Heift 2274cc68a8a5SGerhard Heift buf_size = args.buf_size; 2275cc68a8a5SGerhard Heift 2276cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2277cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2278cc68a8a5SGerhard Heift buf_size = buf_limit; 2279cc68a8a5SGerhard Heift 2280cc68a8a5SGerhard Heift inode = file_inode(file); 2281cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2282718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2283cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2284cc68a8a5SGerhard Heift ret = -EFAULT; 2285cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2286cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2287cc68a8a5SGerhard Heift ret = -EFAULT; 2288cc68a8a5SGerhard Heift 228976dda93cSYan, Zheng return ret; 229076dda93cSYan, Zheng } 229176dda93cSYan, Zheng 229298d377a0STARUISI Hiroaki /* 2293ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2294ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 229598d377a0STARUISI Hiroaki */ 229698d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 229798d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 229898d377a0STARUISI Hiroaki { 229998d377a0STARUISI Hiroaki struct btrfs_root *root; 230098d377a0STARUISI Hiroaki struct btrfs_key key; 2301ac8e9819SChris Mason char *ptr; 230298d377a0STARUISI Hiroaki int ret = -1; 230398d377a0STARUISI Hiroaki int slot; 230498d377a0STARUISI Hiroaki int len; 230598d377a0STARUISI Hiroaki int total_len = 0; 230698d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 230798d377a0STARUISI Hiroaki struct extent_buffer *l; 230898d377a0STARUISI Hiroaki struct btrfs_path *path; 230998d377a0STARUISI Hiroaki 231098d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 231198d377a0STARUISI Hiroaki name[0]='\0'; 231298d377a0STARUISI Hiroaki return 0; 231398d377a0STARUISI Hiroaki } 231498d377a0STARUISI Hiroaki 231598d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 231698d377a0STARUISI Hiroaki if (!path) 231798d377a0STARUISI Hiroaki return -ENOMEM; 231898d377a0STARUISI Hiroaki 2319c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 232098d377a0STARUISI Hiroaki 232156e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 232298d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2323ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 232488234012SJosef Bacik root = NULL; 232588234012SJosef Bacik goto out; 232688234012SJosef Bacik } 232798d377a0STARUISI Hiroaki 232898d377a0STARUISI Hiroaki key.objectid = dirid; 232998d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 23308ad6fcabSChris Mason key.offset = (u64)-1; 233198d377a0STARUISI Hiroaki 233298d377a0STARUISI Hiroaki while (1) { 233398d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 233498d377a0STARUISI Hiroaki if (ret < 0) 233598d377a0STARUISI Hiroaki goto out; 233618674c6cSFilipe David Borba Manana else if (ret > 0) { 233718674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 233818674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 233918674c6cSFilipe David Borba Manana if (ret < 0) 234018674c6cSFilipe David Borba Manana goto out; 234118674c6cSFilipe David Borba Manana else if (ret > 0) { 2342ac8e9819SChris Mason ret = -ENOENT; 234398d377a0STARUISI Hiroaki goto out; 2344ac8e9819SChris Mason } 234518674c6cSFilipe David Borba Manana } 234618674c6cSFilipe David Borba Manana 234718674c6cSFilipe David Borba Manana l = path->nodes[0]; 234818674c6cSFilipe David Borba Manana slot = path->slots[0]; 234918674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 235098d377a0STARUISI Hiroaki 235198d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 235298d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 235398d377a0STARUISI Hiroaki ptr -= len + 1; 235498d377a0STARUISI Hiroaki total_len += len + 1; 2355a696cf35SFilipe David Borba Manana if (ptr < name) { 2356a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 235798d377a0STARUISI Hiroaki goto out; 2358a696cf35SFilipe David Borba Manana } 235998d377a0STARUISI Hiroaki 236098d377a0STARUISI Hiroaki *(ptr + len) = '/'; 236198d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 236298d377a0STARUISI Hiroaki 236398d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 236498d377a0STARUISI Hiroaki break; 236598d377a0STARUISI Hiroaki 2366b3b4aa74SDavid Sterba btrfs_release_path(path); 236798d377a0STARUISI Hiroaki key.objectid = key.offset; 23688ad6fcabSChris Mason key.offset = (u64)-1; 236998d377a0STARUISI Hiroaki dirid = key.objectid; 237098d377a0STARUISI Hiroaki } 237177906a50SLi Zefan memmove(name, ptr, total_len); 237298d377a0STARUISI Hiroaki name[total_len] = '\0'; 237398d377a0STARUISI Hiroaki ret = 0; 237498d377a0STARUISI Hiroaki out: 237500246528SJosef Bacik btrfs_put_root(root); 237698d377a0STARUISI Hiroaki btrfs_free_path(path); 2377ac8e9819SChris Mason return ret; 2378ac8e9819SChris Mason } 2379ac8e9819SChris Mason 238023d0b79dSTomohiro Misono static int btrfs_search_path_in_tree_user(struct inode *inode, 238123d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 238223d0b79dSTomohiro Misono { 238323d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 238423d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 238523d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 238623d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 238723d0b79dSTomohiro Misono u64 dirid = args->dirid; 238823d0b79dSTomohiro Misono unsigned long item_off; 238923d0b79dSTomohiro Misono unsigned long item_len; 239023d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 239123d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2392b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 239323d0b79dSTomohiro Misono struct btrfs_path *path; 239423d0b79dSTomohiro Misono struct btrfs_key key, key2; 239523d0b79dSTomohiro Misono struct extent_buffer *leaf; 239623d0b79dSTomohiro Misono struct inode *temp_inode; 239723d0b79dSTomohiro Misono char *ptr; 239823d0b79dSTomohiro Misono int slot; 239923d0b79dSTomohiro Misono int len; 240023d0b79dSTomohiro Misono int total_len = 0; 240123d0b79dSTomohiro Misono int ret; 240223d0b79dSTomohiro Misono 240323d0b79dSTomohiro Misono path = btrfs_alloc_path(); 240423d0b79dSTomohiro Misono if (!path) 240523d0b79dSTomohiro Misono return -ENOMEM; 240623d0b79dSTomohiro Misono 240723d0b79dSTomohiro Misono /* 240823d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 240923d0b79dSTomohiro Misono * construct the path in from the bottom up. 241023d0b79dSTomohiro Misono */ 241123d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 241223d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 241323d0b79dSTomohiro Misono 241456e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 241523d0b79dSTomohiro Misono if (IS_ERR(root)) { 241623d0b79dSTomohiro Misono ret = PTR_ERR(root); 241723d0b79dSTomohiro Misono goto out; 241823d0b79dSTomohiro Misono } 241923d0b79dSTomohiro Misono 242023d0b79dSTomohiro Misono key.objectid = dirid; 242123d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 242223d0b79dSTomohiro Misono key.offset = (u64)-1; 242323d0b79dSTomohiro Misono while (1) { 242423d0b79dSTomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 242523d0b79dSTomohiro Misono if (ret < 0) { 2426b8a49ae1SJosef Bacik goto out_put; 242723d0b79dSTomohiro Misono } else if (ret > 0) { 242823d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 242923d0b79dSTomohiro Misono BTRFS_INODE_REF_KEY); 243023d0b79dSTomohiro Misono if (ret < 0) { 2431b8a49ae1SJosef Bacik goto out_put; 243223d0b79dSTomohiro Misono } else if (ret > 0) { 243323d0b79dSTomohiro Misono ret = -ENOENT; 2434b8a49ae1SJosef Bacik goto out_put; 243523d0b79dSTomohiro Misono } 243623d0b79dSTomohiro Misono } 243723d0b79dSTomohiro Misono 243823d0b79dSTomohiro Misono leaf = path->nodes[0]; 243923d0b79dSTomohiro Misono slot = path->slots[0]; 244023d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 244123d0b79dSTomohiro Misono 244223d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 244323d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 244423d0b79dSTomohiro Misono ptr -= len + 1; 244523d0b79dSTomohiro Misono total_len += len + 1; 244623d0b79dSTomohiro Misono if (ptr < args->path) { 244723d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2448b8a49ae1SJosef Bacik goto out_put; 244923d0b79dSTomohiro Misono } 245023d0b79dSTomohiro Misono 245123d0b79dSTomohiro Misono *(ptr + len) = '/'; 245223d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 245323d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 245423d0b79dSTomohiro Misono 245523d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 245623d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 245723d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 245823d0b79dSTomohiro Misono if (ret < 0) { 2459b8a49ae1SJosef Bacik goto out_put; 246023d0b79dSTomohiro Misono } else if (ret > 0) { 246123d0b79dSTomohiro Misono ret = -ENOENT; 2462b8a49ae1SJosef Bacik goto out_put; 246323d0b79dSTomohiro Misono } 246423d0b79dSTomohiro Misono 246523d0b79dSTomohiro Misono leaf = path->nodes[0]; 246623d0b79dSTomohiro Misono slot = path->slots[0]; 246723d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 246823d0b79dSTomohiro Misono if (key2.objectid != dirid) { 246923d0b79dSTomohiro Misono ret = -ENOENT; 2470b8a49ae1SJosef Bacik goto out_put; 247123d0b79dSTomohiro Misono } 247223d0b79dSTomohiro Misono 24730202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 24743ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 24753ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2476b8a49ae1SJosef Bacik goto out_put; 24773ca57bd6SMisono Tomohiro } 247823d0b79dSTomohiro Misono ret = inode_permission(temp_inode, MAY_READ | MAY_EXEC); 247923d0b79dSTomohiro Misono iput(temp_inode); 248023d0b79dSTomohiro Misono if (ret) { 248123d0b79dSTomohiro Misono ret = -EACCES; 2482b8a49ae1SJosef Bacik goto out_put; 248323d0b79dSTomohiro Misono } 248423d0b79dSTomohiro Misono 248523d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 248623d0b79dSTomohiro Misono break; 248723d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 248823d0b79dSTomohiro Misono ret = -EACCES; 2489b8a49ae1SJosef Bacik goto out_put; 249023d0b79dSTomohiro Misono } 249123d0b79dSTomohiro Misono 249223d0b79dSTomohiro Misono btrfs_release_path(path); 249323d0b79dSTomohiro Misono key.objectid = key.offset; 249423d0b79dSTomohiro Misono key.offset = (u64)-1; 249523d0b79dSTomohiro Misono dirid = key.objectid; 249623d0b79dSTomohiro Misono } 249723d0b79dSTomohiro Misono 249823d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 249923d0b79dSTomohiro Misono args->path[total_len] = '\0'; 250000246528SJosef Bacik btrfs_put_root(root); 2501b8a49ae1SJosef Bacik root = NULL; 250223d0b79dSTomohiro Misono btrfs_release_path(path); 250323d0b79dSTomohiro Misono } 250423d0b79dSTomohiro Misono 250523d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 250623d0b79dSTomohiro Misono key.objectid = treeid; 250723d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 250823d0b79dSTomohiro Misono key.offset = args->treeid; 2509b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 251023d0b79dSTomohiro Misono if (ret < 0) { 251123d0b79dSTomohiro Misono goto out; 251223d0b79dSTomohiro Misono } else if (ret > 0) { 251323d0b79dSTomohiro Misono ret = -ENOENT; 251423d0b79dSTomohiro Misono goto out; 251523d0b79dSTomohiro Misono } 251623d0b79dSTomohiro Misono 251723d0b79dSTomohiro Misono leaf = path->nodes[0]; 251823d0b79dSTomohiro Misono slot = path->slots[0]; 251923d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 252023d0b79dSTomohiro Misono 252123d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 252223d0b79dSTomohiro Misono item_len = btrfs_item_size_nr(leaf, slot); 252323d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 252423d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 252523d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 252623d0b79dSTomohiro Misono ret = -EINVAL; 252723d0b79dSTomohiro Misono goto out; 252823d0b79dSTomohiro Misono } 252923d0b79dSTomohiro Misono 253023d0b79dSTomohiro Misono /* Copy subvolume's name */ 253123d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 253223d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 253323d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 253423d0b79dSTomohiro Misono args->name[item_len] = 0; 253523d0b79dSTomohiro Misono 2536b8a49ae1SJosef Bacik out_put: 253700246528SJosef Bacik btrfs_put_root(root); 253823d0b79dSTomohiro Misono out: 253923d0b79dSTomohiro Misono btrfs_free_path(path); 254023d0b79dSTomohiro Misono return ret; 254123d0b79dSTomohiro Misono } 254223d0b79dSTomohiro Misono 2543ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2544ac8e9819SChris Mason void __user *argp) 2545ac8e9819SChris Mason { 2546ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2547ac8e9819SChris Mason struct inode *inode; 254801b810b8SDavid Sterba int ret = 0; 2549ac8e9819SChris Mason 25502354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 25512354d08fSJulia Lawall if (IS_ERR(args)) 25522354d08fSJulia Lawall return PTR_ERR(args); 2553c2b96929SDan Carpenter 2554496ad9aaSAl Viro inode = file_inode(file); 2555ac8e9819SChris Mason 255601b810b8SDavid Sterba /* 255701b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 255801b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 255901b810b8SDavid Sterba */ 25601b53ac4dSChris Mason if (args->treeid == 0) 25611b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 25621b53ac4dSChris Mason 256301b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 256401b810b8SDavid Sterba args->name[0] = 0; 256501b810b8SDavid Sterba goto out; 256601b810b8SDavid Sterba } 256701b810b8SDavid Sterba 256801b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 256901b810b8SDavid Sterba ret = -EPERM; 257001b810b8SDavid Sterba goto out; 257101b810b8SDavid Sterba } 257201b810b8SDavid Sterba 2573ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2574ac8e9819SChris Mason args->treeid, args->objectid, 2575ac8e9819SChris Mason args->name); 2576ac8e9819SChris Mason 257701b810b8SDavid Sterba out: 2578ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2579ac8e9819SChris Mason ret = -EFAULT; 2580ac8e9819SChris Mason 2581ac8e9819SChris Mason kfree(args); 258298d377a0STARUISI Hiroaki return ret; 258398d377a0STARUISI Hiroaki } 258498d377a0STARUISI Hiroaki 258523d0b79dSTomohiro Misono /* 258623d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 258723d0b79dSTomohiro Misono * 258823d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 258923d0b79dSTomohiro Misono * 259023d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 259123d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 259223d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 259323d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 259423d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 259523d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 259623d0b79dSTomohiro Misono */ 259723d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 259823d0b79dSTomohiro Misono { 259923d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 260023d0b79dSTomohiro Misono struct inode *inode; 260123d0b79dSTomohiro Misono int ret; 260223d0b79dSTomohiro Misono 260323d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 260423d0b79dSTomohiro Misono if (IS_ERR(args)) 260523d0b79dSTomohiro Misono return PTR_ERR(args); 260623d0b79dSTomohiro Misono 260723d0b79dSTomohiro Misono inode = file_inode(file); 260823d0b79dSTomohiro Misono 260923d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 261023d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 261123d0b79dSTomohiro Misono /* 261223d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 261323d0b79dSTomohiro Misono * called 261423d0b79dSTomohiro Misono */ 261523d0b79dSTomohiro Misono kfree(args); 261623d0b79dSTomohiro Misono return -EACCES; 261723d0b79dSTomohiro Misono } 261823d0b79dSTomohiro Misono 261923d0b79dSTomohiro Misono ret = btrfs_search_path_in_tree_user(inode, args); 262023d0b79dSTomohiro Misono 262123d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 262223d0b79dSTomohiro Misono ret = -EFAULT; 262323d0b79dSTomohiro Misono 262423d0b79dSTomohiro Misono kfree(args); 262523d0b79dSTomohiro Misono return ret; 262623d0b79dSTomohiro Misono } 262723d0b79dSTomohiro Misono 2628b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 2629b64ec075STomohiro Misono static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) 2630b64ec075STomohiro Misono { 2631b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2632b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2633b64ec075STomohiro Misono struct btrfs_root *root; 2634b64ec075STomohiro Misono struct btrfs_path *path; 2635b64ec075STomohiro Misono struct btrfs_key key; 2636b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2637b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2638b64ec075STomohiro Misono struct extent_buffer *leaf; 2639b64ec075STomohiro Misono unsigned long item_off; 2640b64ec075STomohiro Misono unsigned long item_len; 2641b64ec075STomohiro Misono struct inode *inode; 2642b64ec075STomohiro Misono int slot; 2643b64ec075STomohiro Misono int ret = 0; 2644b64ec075STomohiro Misono 2645b64ec075STomohiro Misono path = btrfs_alloc_path(); 2646b64ec075STomohiro Misono if (!path) 2647b64ec075STomohiro Misono return -ENOMEM; 2648b64ec075STomohiro Misono 2649b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2650b64ec075STomohiro Misono if (!subvol_info) { 2651b64ec075STomohiro Misono btrfs_free_path(path); 2652b64ec075STomohiro Misono return -ENOMEM; 2653b64ec075STomohiro Misono } 2654b64ec075STomohiro Misono 2655b64ec075STomohiro Misono inode = file_inode(file); 2656b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2657b64ec075STomohiro Misono 2658b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2659b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 266056e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2661b64ec075STomohiro Misono if (IS_ERR(root)) { 2662b64ec075STomohiro Misono ret = PTR_ERR(root); 266304734e84SJosef Bacik goto out_free; 266404734e84SJosef Bacik } 2665b64ec075STomohiro Misono root_item = &root->root_item; 2666b64ec075STomohiro Misono 2667b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2668b64ec075STomohiro Misono 2669b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2670b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2671b64ec075STomohiro Misono 2672b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2673b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2674b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2675b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2676b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2677b64ec075STomohiro Misono 2678b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2679b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2680b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2681b64ec075STomohiro Misono 2682b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2683b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2684b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2685b64ec075STomohiro Misono 2686b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2687b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2688b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2689b64ec075STomohiro Misono 2690b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2691b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2692b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2693b64ec075STomohiro Misono 2694b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2695b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2696b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2697b64ec075STomohiro Misono key.offset = 0; 269804734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2699b64ec075STomohiro Misono if (ret < 0) { 2700b64ec075STomohiro Misono goto out; 2701b64ec075STomohiro Misono } else if (path->slots[0] >= 2702b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 270304734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2704b64ec075STomohiro Misono if (ret < 0) { 2705b64ec075STomohiro Misono goto out; 2706b64ec075STomohiro Misono } else if (ret > 0) { 2707b64ec075STomohiro Misono ret = -EUCLEAN; 2708b64ec075STomohiro Misono goto out; 2709b64ec075STomohiro Misono } 2710b64ec075STomohiro Misono } 2711b64ec075STomohiro Misono 2712b64ec075STomohiro Misono leaf = path->nodes[0]; 2713b64ec075STomohiro Misono slot = path->slots[0]; 2714b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2715b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2716b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2717b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2718b64ec075STomohiro Misono 2719b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2720b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2721b64ec075STomohiro Misono 2722b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2723b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 2724b64ec075STomohiro Misono item_len = btrfs_item_size_nr(leaf, slot) 2725b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2726b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2727b64ec075STomohiro Misono item_off, item_len); 2728b64ec075STomohiro Misono } else { 2729b64ec075STomohiro Misono ret = -ENOENT; 2730b64ec075STomohiro Misono goto out; 2731b64ec075STomohiro Misono } 2732b64ec075STomohiro Misono } 2733b64ec075STomohiro Misono 2734b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2735b64ec075STomohiro Misono ret = -EFAULT; 2736b64ec075STomohiro Misono 2737b64ec075STomohiro Misono out: 273800246528SJosef Bacik btrfs_put_root(root); 273904734e84SJosef Bacik out_free: 2740b64ec075STomohiro Misono btrfs_free_path(path); 2741b091f7feSWaiman Long kfree(subvol_info); 2742b64ec075STomohiro Misono return ret; 2743b64ec075STomohiro Misono } 2744b64ec075STomohiro Misono 274542e4b520STomohiro Misono /* 274642e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 274742e4b520STomohiro Misono * except the subvolume name. 274842e4b520STomohiro Misono */ 274942e4b520STomohiro Misono static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp) 275042e4b520STomohiro Misono { 275142e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 275242e4b520STomohiro Misono struct btrfs_root_ref *rref; 275342e4b520STomohiro Misono struct btrfs_root *root; 275442e4b520STomohiro Misono struct btrfs_path *path; 275542e4b520STomohiro Misono struct btrfs_key key; 275642e4b520STomohiro Misono struct extent_buffer *leaf; 275742e4b520STomohiro Misono struct inode *inode; 275842e4b520STomohiro Misono u64 objectid; 275942e4b520STomohiro Misono int slot; 276042e4b520STomohiro Misono int ret; 276142e4b520STomohiro Misono u8 found; 276242e4b520STomohiro Misono 276342e4b520STomohiro Misono path = btrfs_alloc_path(); 276442e4b520STomohiro Misono if (!path) 276542e4b520STomohiro Misono return -ENOMEM; 276642e4b520STomohiro Misono 276742e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 276842e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 276942e4b520STomohiro Misono btrfs_free_path(path); 277042e4b520STomohiro Misono return PTR_ERR(rootrefs); 277142e4b520STomohiro Misono } 277242e4b520STomohiro Misono 277342e4b520STomohiro Misono inode = file_inode(file); 277442e4b520STomohiro Misono root = BTRFS_I(inode)->root->fs_info->tree_root; 277542e4b520STomohiro Misono objectid = BTRFS_I(inode)->root->root_key.objectid; 277642e4b520STomohiro Misono 277742e4b520STomohiro Misono key.objectid = objectid; 277842e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 277942e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 278042e4b520STomohiro Misono found = 0; 278142e4b520STomohiro Misono 278242e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 278342e4b520STomohiro Misono if (ret < 0) { 278442e4b520STomohiro Misono goto out; 278542e4b520STomohiro Misono } else if (path->slots[0] >= 278642e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 278742e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 278842e4b520STomohiro Misono if (ret < 0) { 278942e4b520STomohiro Misono goto out; 279042e4b520STomohiro Misono } else if (ret > 0) { 279142e4b520STomohiro Misono ret = -EUCLEAN; 279242e4b520STomohiro Misono goto out; 279342e4b520STomohiro Misono } 279442e4b520STomohiro Misono } 279542e4b520STomohiro Misono while (1) { 279642e4b520STomohiro Misono leaf = path->nodes[0]; 279742e4b520STomohiro Misono slot = path->slots[0]; 279842e4b520STomohiro Misono 279942e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 280042e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 280142e4b520STomohiro Misono ret = 0; 280242e4b520STomohiro Misono goto out; 280342e4b520STomohiro Misono } 280442e4b520STomohiro Misono 280542e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 280642e4b520STomohiro Misono ret = -EOVERFLOW; 280742e4b520STomohiro Misono goto out; 280842e4b520STomohiro Misono } 280942e4b520STomohiro Misono 281042e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 281142e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 281242e4b520STomohiro Misono rootrefs->rootref[found].dirid = 281342e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 281442e4b520STomohiro Misono found++; 281542e4b520STomohiro Misono 281642e4b520STomohiro Misono ret = btrfs_next_item(root, path); 281742e4b520STomohiro Misono if (ret < 0) { 281842e4b520STomohiro Misono goto out; 281942e4b520STomohiro Misono } else if (ret > 0) { 282042e4b520STomohiro Misono ret = -EUCLEAN; 282142e4b520STomohiro Misono goto out; 282242e4b520STomohiro Misono } 282342e4b520STomohiro Misono } 282442e4b520STomohiro Misono 282542e4b520STomohiro Misono out: 282642e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 282742e4b520STomohiro Misono rootrefs->num_items = found; 282842e4b520STomohiro Misono /* update min_treeid for next search */ 282942e4b520STomohiro Misono if (found) 283042e4b520STomohiro Misono rootrefs->min_treeid = 283142e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 283242e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 283342e4b520STomohiro Misono ret = -EFAULT; 283442e4b520STomohiro Misono } 283542e4b520STomohiro Misono 283642e4b520STomohiro Misono kfree(rootrefs); 283742e4b520STomohiro Misono btrfs_free_path(path); 283842e4b520STomohiro Misono 283942e4b520STomohiro Misono return ret; 284042e4b520STomohiro Misono } 284142e4b520STomohiro Misono 284276dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2843949964c9SMarcos Paulo de Souza void __user *arg, 2844949964c9SMarcos Paulo de Souza bool destroy_v2) 284576dda93cSYan, Zheng { 284654563d41SAl Viro struct dentry *parent = file->f_path.dentry; 28470b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 284876dda93cSYan, Zheng struct dentry *dentry; 28492b0143b5SDavid Howells struct inode *dir = d_inode(parent); 285076dda93cSYan, Zheng struct inode *inode; 285176dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 285276dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2853949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2854949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 2855949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2856949964c9SMarcos Paulo de Souza int subvol_namelen; 285776dda93cSYan, Zheng int err = 0; 2858949964c9SMarcos Paulo de Souza bool destroy_parent = false; 285976dda93cSYan, Zheng 2860949964c9SMarcos Paulo de Souza if (destroy_v2) { 2861949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2862949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2863949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2864325c50e3SJeff Mahoney 2865949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2866949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2867949964c9SMarcos Paulo de Souza goto out; 2868949964c9SMarcos Paulo de Souza } 286976dda93cSYan, Zheng 2870949964c9SMarcos Paulo de Souza /* 2871949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2872949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2873949964c9SMarcos Paulo de Souza */ 2874949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2875949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2876949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2877949964c9SMarcos Paulo de Souza 2878949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2879949964c9SMarcos Paulo de Souza if (err) 2880949964c9SMarcos Paulo de Souza goto out; 2881949964c9SMarcos Paulo de Souza } else { 2882949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 288376dda93cSYan, Zheng err = -EINVAL; 288476dda93cSYan, Zheng goto out; 288576dda93cSYan, Zheng } 288676dda93cSYan, Zheng 2887a561be71SAl Viro err = mnt_want_write_file(file); 288876dda93cSYan, Zheng if (err) 288976dda93cSYan, Zheng goto out; 289076dda93cSYan, Zheng 2891949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 2892949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 2893949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 2894949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 2895949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 2896949964c9SMarcos Paulo de Souza goto out_drop_write; 2897949964c9SMarcos Paulo de Souza } 2898949964c9SMarcos Paulo de Souza 2899949964c9SMarcos Paulo de Souza /* 2900949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 2901949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 2902949964c9SMarcos Paulo de Souza */ 2903949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 2904949964c9SMarcos Paulo de Souza 2905949964c9SMarcos Paulo de Souza /* 2906949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 2907949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 2908949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 2909949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 2910949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 2911949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 2912949964c9SMarcos Paulo de Souza */ 2913949964c9SMarcos Paulo de Souza dput(dentry); 2914949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 2915949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 2916949964c9SMarcos Paulo de Souza goto out_drop_write; 2917949964c9SMarcos Paulo de Souza } 2918949964c9SMarcos Paulo de Souza dir = d_inode(parent); 2919949964c9SMarcos Paulo de Souza 2920949964c9SMarcos Paulo de Souza /* 2921949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 2922949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 2923949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 2924949964c9SMarcos Paulo de Souza * new parent dentry. 2925949964c9SMarcos Paulo de Souza */ 2926949964c9SMarcos Paulo de Souza destroy_parent = true; 2927949964c9SMarcos Paulo de Souza 2928949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 2929949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 2930949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 2931949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 2932949964c9SMarcos Paulo de Souza goto free_parent; 2933949964c9SMarcos Paulo de Souza } 2934949964c9SMarcos Paulo de Souza /* subvol_name_ptr is already NULL termined */ 2935949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 2936949964c9SMarcos Paulo de Souza } 2937949964c9SMarcos Paulo de Souza } else { 2938949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 2939949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 2940949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 2941949964c9SMarcos Paulo de Souza 2942949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 2943949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 2944949964c9SMarcos Paulo de Souza 2945949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2946949964c9SMarcos Paulo de Souza if (err) 2947949964c9SMarcos Paulo de Souza goto out; 2948949964c9SMarcos Paulo de Souza } 2949949964c9SMarcos Paulo de Souza 2950949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 2951949964c9SMarcos Paulo de Souza 2952949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 2953949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 2954949964c9SMarcos Paulo de Souza err = -EINVAL; 2955949964c9SMarcos Paulo de Souza goto free_subvol_name; 2956949964c9SMarcos Paulo de Souza } 2957949964c9SMarcos Paulo de Souza 2958949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 2959949964c9SMarcos Paulo de Souza err = -ENOTDIR; 2960949964c9SMarcos Paulo de Souza goto free_subvol_name; 2961949964c9SMarcos Paulo de Souza } 2962521e0546SDavid Sterba 296300235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 296400235411SAl Viro if (err == -EINTR) 2965949964c9SMarcos Paulo de Souza goto free_subvol_name; 2966949964c9SMarcos Paulo de Souza dentry = lookup_one_len(subvol_name, parent, subvol_namelen); 296776dda93cSYan, Zheng if (IS_ERR(dentry)) { 296876dda93cSYan, Zheng err = PTR_ERR(dentry); 296976dda93cSYan, Zheng goto out_unlock_dir; 297076dda93cSYan, Zheng } 297176dda93cSYan, Zheng 29722b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 297376dda93cSYan, Zheng err = -ENOENT; 297476dda93cSYan, Zheng goto out_dput; 297576dda93cSYan, Zheng } 297676dda93cSYan, Zheng 29772b0143b5SDavid Howells inode = d_inode(dentry); 29784260f7c7SSage Weil dest = BTRFS_I(inode)->root; 29794260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 29804260f7c7SSage Weil /* 29814260f7c7SSage Weil * Regular user. Only allow this with a special mount 29824260f7c7SSage Weil * option, when the user has write+exec access to the 29834260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 29844260f7c7SSage Weil * allowed. 29854260f7c7SSage Weil * 29864260f7c7SSage Weil * Note that this is _not_ check that the subvol is 29874260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 29884260f7c7SSage Weil * otherwise be able to delete. 29894260f7c7SSage Weil * 29904260f7c7SSage Weil * Users who want to delete empty subvols should try 29914260f7c7SSage Weil * rmdir(2). 29924260f7c7SSage Weil */ 29934260f7c7SSage Weil err = -EPERM; 29940b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 29954260f7c7SSage Weil goto out_dput; 29964260f7c7SSage Weil 29974260f7c7SSage Weil /* 29984260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 29994260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 30004260f7c7SSage Weil * must be called on the dentry referencing the root 30014260f7c7SSage Weil * of the subvol, not a random directory contained 30024260f7c7SSage Weil * within it. 30034260f7c7SSage Weil */ 30044260f7c7SSage Weil err = -EINVAL; 30054260f7c7SSage Weil if (root == dest) 30064260f7c7SSage Weil goto out_dput; 30074260f7c7SSage Weil 30084260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 30094260f7c7SSage Weil if (err) 30104260f7c7SSage Weil goto out_dput; 30115c39da5bSMiao Xie } 30124260f7c7SSage Weil 30135c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 30144260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 30154260f7c7SSage Weil if (err) 30164260f7c7SSage Weil goto out_dput; 30174260f7c7SSage Weil 30184a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 301976dda93cSYan, Zheng err = -EINVAL; 302076dda93cSYan, Zheng goto out_dput; 302176dda93cSYan, Zheng } 302276dda93cSYan, Zheng 30235955102cSAl Viro inode_lock(inode); 3024f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 30255955102cSAl Viro inode_unlock(inode); 302646008d9dSAmir Goldstein if (!err) { 302746008d9dSAmir Goldstein fsnotify_rmdir(dir, dentry); 302876dda93cSYan, Zheng d_delete(dentry); 302946008d9dSAmir Goldstein } 3030fa6ac876SLiu Bo 303176dda93cSYan, Zheng out_dput: 303276dda93cSYan, Zheng dput(dentry); 303376dda93cSYan, Zheng out_unlock_dir: 30345955102cSAl Viro inode_unlock(dir); 3035949964c9SMarcos Paulo de Souza free_subvol_name: 3036949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3037949964c9SMarcos Paulo de Souza free_parent: 3038949964c9SMarcos Paulo de Souza if (destroy_parent) 3039949964c9SMarcos Paulo de Souza dput(parent); 304000235411SAl Viro out_drop_write: 30412a79f17eSAl Viro mnt_drop_write_file(file); 304276dda93cSYan, Zheng out: 3043949964c9SMarcos Paulo de Souza kfree(vol_args2); 304476dda93cSYan, Zheng kfree(vol_args); 304576dda93cSYan, Zheng return err; 304676dda93cSYan, Zheng } 304776dda93cSYan, Zheng 30481e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3049f46b5a66SChristoph Hellwig { 3050496ad9aaSAl Viro struct inode *inode = file_inode(file); 3051f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 30521e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 3053c146afadSYan Zheng int ret; 3054c146afadSYan Zheng 305525122d15SIlya Dryomov ret = mnt_want_write_file(file); 305625122d15SIlya Dryomov if (ret) 305725122d15SIlya Dryomov return ret; 3058b83cc969SLi Zefan 305925122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 306025122d15SIlya Dryomov ret = -EROFS; 306125122d15SIlya Dryomov goto out; 30625ac00addSStefan Behrens } 3063f46b5a66SChristoph Hellwig 3064f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3065f46b5a66SChristoph Hellwig case S_IFDIR: 3066e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3067e441d54dSChris Mason ret = -EPERM; 3068e441d54dSChris Mason goto out; 3069e441d54dSChris Mason } 3070de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3071f46b5a66SChristoph Hellwig break; 3072f46b5a66SChristoph Hellwig case S_IFREG: 3073616d374eSAdam Borowski /* 3074616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3075616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3076616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3077616d374eSAdam Borowski */ 3078616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 3079616d374eSAdam Borowski inode_permission(inode, MAY_WRITE)) { 3080616d374eSAdam Borowski ret = -EPERM; 3081e441d54dSChris Mason goto out; 3082e441d54dSChris Mason } 30831e701a32SChris Mason 30841e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 30851e701a32SChris Mason if (!range) { 30861e701a32SChris Mason ret = -ENOMEM; 30871e701a32SChris Mason goto out; 30881e701a32SChris Mason } 30891e701a32SChris Mason 30901e701a32SChris Mason if (argp) { 30911e701a32SChris Mason if (copy_from_user(range, argp, 30921e701a32SChris Mason sizeof(*range))) { 30931e701a32SChris Mason ret = -EFAULT; 30941e701a32SChris Mason kfree(range); 3095683be16eSDan Carpenter goto out; 30961e701a32SChris Mason } 30971e701a32SChris Mason /* compression requires us to start the IO */ 30981e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 30991e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 31001e701a32SChris Mason range->extent_thresh = (u32)-1; 31011e701a32SChris Mason } 31021e701a32SChris Mason } else { 31031e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 31041e701a32SChris Mason range->len = (u64)-1; 31051e701a32SChris Mason } 3106496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 31077c829b72SAnand Jain range, BTRFS_OLDEST_GENERATION, 0); 31084cb5300bSChris Mason if (ret > 0) 31094cb5300bSChris Mason ret = 0; 31101e701a32SChris Mason kfree(range); 3111f46b5a66SChristoph Hellwig break; 31128929ecfaSYan, Zheng default: 31138929ecfaSYan, Zheng ret = -EINVAL; 3114f46b5a66SChristoph Hellwig } 3115e441d54dSChris Mason out: 311625122d15SIlya Dryomov mnt_drop_write_file(file); 3117e441d54dSChris Mason return ret; 3118f46b5a66SChristoph Hellwig } 3119f46b5a66SChristoph Hellwig 31202ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3121f46b5a66SChristoph Hellwig { 3122f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3123f46b5a66SChristoph Hellwig int ret; 3124f46b5a66SChristoph Hellwig 3125e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3126e441d54dSChris Mason return -EPERM; 3127e441d54dSChris Mason 3128171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) 3129e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3130c9e9f97bSIlya Dryomov 3131dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3132c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3133c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3134c9e9f97bSIlya Dryomov goto out; 3135c9e9f97bSIlya Dryomov } 3136f46b5a66SChristoph Hellwig 31375516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 31382ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3139f46b5a66SChristoph Hellwig 314043d20761SAnand Jain if (!ret) 31410b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 314243d20761SAnand Jain 3143f46b5a66SChristoph Hellwig kfree(vol_args); 3144c9e9f97bSIlya Dryomov out: 3145171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 3146f46b5a66SChristoph Hellwig return ret; 3147f46b5a66SChristoph Hellwig } 3148f46b5a66SChristoph Hellwig 31496b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3150f46b5a66SChristoph Hellwig { 31510b246afaSJeff Mahoney struct inode *inode = file_inode(file); 31520b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 31536b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 3154f46b5a66SChristoph Hellwig int ret; 3155f46b5a66SChristoph Hellwig 3156e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3157e441d54dSChris Mason return -EPERM; 3158e441d54dSChris Mason 3159da24927bSMiao Xie ret = mnt_want_write_file(file); 3160da24927bSMiao Xie if (ret) 3161da24927bSMiao Xie return ret; 3162c146afadSYan Zheng 3163dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3164c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3165c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3166c47ca32dSDan Carpenter goto err_drop; 3167c9e9f97bSIlya Dryomov } 3168f46b5a66SChristoph Hellwig 3169748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3170fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3171fd4e994bSOmar Sandoval goto out; 3172fd4e994bSOmar Sandoval } 3173f46b5a66SChristoph Hellwig 3174171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3175183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3176183860f6SAnand Jain goto out; 3177183860f6SAnand Jain } 3178183860f6SAnand Jain 3179735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 31802ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, NULL, vol_args->devid); 31816b526ed7SAnand Jain } else { 31826b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 31832ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 31846b526ed7SAnand Jain } 3185171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 3186183860f6SAnand Jain 31876b526ed7SAnand Jain if (!ret) { 3188735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 31890b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 31906b526ed7SAnand Jain vol_args->devid); 31916b526ed7SAnand Jain else 31920b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 31936b526ed7SAnand Jain vol_args->name); 31946b526ed7SAnand Jain } 3195183860f6SAnand Jain out: 3196183860f6SAnand Jain kfree(vol_args); 3197c47ca32dSDan Carpenter err_drop: 31984ac20c70SIlya Dryomov mnt_drop_write_file(file); 3199f46b5a66SChristoph Hellwig return ret; 3200f46b5a66SChristoph Hellwig } 3201f46b5a66SChristoph Hellwig 3202f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3203f46b5a66SChristoph Hellwig { 32040b246afaSJeff Mahoney struct inode *inode = file_inode(file); 32050b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3206f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3207f46b5a66SChristoph Hellwig int ret; 3208f46b5a66SChristoph Hellwig 3209f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3210f46b5a66SChristoph Hellwig return -EPERM; 3211f46b5a66SChristoph Hellwig 3212f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3213f46b5a66SChristoph Hellwig if (ret) 3214f46b5a66SChristoph Hellwig return ret; 3215f46b5a66SChristoph Hellwig 3216171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3217f46b5a66SChristoph Hellwig ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 321858d7bbf8SDavid Sterba goto out_drop_write; 321958d7bbf8SDavid Sterba } 322058d7bbf8SDavid Sterba 322158d7bbf8SDavid Sterba vol_args = memdup_user(arg, sizeof(*vol_args)); 322258d7bbf8SDavid Sterba if (IS_ERR(vol_args)) { 322358d7bbf8SDavid Sterba ret = PTR_ERR(vol_args); 3224f46b5a66SChristoph Hellwig goto out; 3225f46b5a66SChristoph Hellwig } 3226f46b5a66SChristoph Hellwig 322758d7bbf8SDavid Sterba vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 32282ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 3229f46b5a66SChristoph Hellwig 3230f46b5a66SChristoph Hellwig if (!ret) 32310b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3232f46b5a66SChristoph Hellwig kfree(vol_args); 323358d7bbf8SDavid Sterba out: 3234171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 323558d7bbf8SDavid Sterba out_drop_write: 3236f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 323758d7bbf8SDavid Sterba 3238f46b5a66SChristoph Hellwig return ret; 3239f46b5a66SChristoph Hellwig } 3240f46b5a66SChristoph Hellwig 32412ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 32422ff7e61eSJeff Mahoney void __user *arg) 3243475f6387SJan Schmidt { 3244027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3245475f6387SJan Schmidt struct btrfs_device *device; 32460b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3247137c5418SJohannes Thumshirn u64 flags_in; 3248027ed2f0SLi Zefan int ret = 0; 3249475f6387SJan Schmidt 3250137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3251137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3252137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3253137c5418SJohannes Thumshirn 3254137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3255137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3256027ed2f0SLi Zefan 3257d03262c7SDavid Sterba rcu_read_lock(); 3258027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3259475f6387SJan Schmidt 3260d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3261027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3262027ed2f0SLi Zefan fi_args->max_id = device->devid; 3263475f6387SJan Schmidt } 3264d03262c7SDavid Sterba rcu_read_unlock(); 3265475f6387SJan Schmidt 3266de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3267bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3268bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3269bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 327080a773fbSDavid Sterba 3271137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3272137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3273137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3274137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3275137c5418SJohannes Thumshirn } 3276137c5418SJohannes Thumshirn 32770fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 32780fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 32790fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 32800fb408a5SJohannes Thumshirn } 32810fb408a5SJohannes Thumshirn 328249bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 328349bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 328449bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 328549bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 328649bac897SJohannes Thumshirn } 328749bac897SJohannes Thumshirn 3288027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3289027ed2f0SLi Zefan ret = -EFAULT; 3290475f6387SJan Schmidt 3291027ed2f0SLi Zefan kfree(fi_args); 3292027ed2f0SLi Zefan return ret; 3293475f6387SJan Schmidt } 3294475f6387SJan Schmidt 32952ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 32962ff7e61eSJeff Mahoney void __user *arg) 3297475f6387SJan Schmidt { 3298475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3299475f6387SJan Schmidt struct btrfs_device *dev; 3300475f6387SJan Schmidt int ret = 0; 3301475f6387SJan Schmidt char *s_uuid = NULL; 3302475f6387SJan Schmidt 3303475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3304475f6387SJan Schmidt if (IS_ERR(di_args)) 3305475f6387SJan Schmidt return PTR_ERR(di_args); 3306475f6387SJan Schmidt 3307dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3308475f6387SJan Schmidt s_uuid = di_args->uuid; 3309475f6387SJan Schmidt 3310c5593ca3SDavid Sterba rcu_read_lock(); 3311e4319cd9SAnand Jain dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid, 331209ba3bc9SAnand Jain NULL, true); 3313475f6387SJan Schmidt 3314475f6387SJan Schmidt if (!dev) { 3315475f6387SJan Schmidt ret = -ENODEV; 3316475f6387SJan Schmidt goto out; 3317475f6387SJan Schmidt } 3318475f6387SJan Schmidt 3319475f6387SJan Schmidt di_args->devid = dev->devid; 33207cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 33217cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3322475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3323a27202fbSJim Meyering if (dev->name) { 3324672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3325672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3326a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3327a27202fbSJim Meyering } else { 332899ba55adSStefan Behrens di_args->path[0] = '\0'; 3329a27202fbSJim Meyering } 3330475f6387SJan Schmidt 3331475f6387SJan Schmidt out: 3332c5593ca3SDavid Sterba rcu_read_unlock(); 3333475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3334475f6387SJan Schmidt ret = -EFAULT; 3335475f6387SJan Schmidt 3336475f6387SJan Schmidt kfree(di_args); 3337475f6387SJan Schmidt return ret; 3338475f6387SJan Schmidt } 3339475f6387SJan Schmidt 33406ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 33416ef5ed0dSJosef Bacik { 3342496ad9aaSAl Viro struct inode *inode = file_inode(file); 33430b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 33446ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 33456ef5ed0dSJosef Bacik struct btrfs_root *new_root; 33466ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 33476ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 33482a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 33496ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 33506ef5ed0dSJosef Bacik u64 objectid = 0; 33516ef5ed0dSJosef Bacik u64 dir_id; 33523c04ce01SMiao Xie int ret; 33536ef5ed0dSJosef Bacik 33546ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 33556ef5ed0dSJosef Bacik return -EPERM; 33566ef5ed0dSJosef Bacik 33573c04ce01SMiao Xie ret = mnt_want_write_file(file); 33583c04ce01SMiao Xie if (ret) 33593c04ce01SMiao Xie return ret; 33603c04ce01SMiao Xie 33613c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 33623c04ce01SMiao Xie ret = -EFAULT; 33633c04ce01SMiao Xie goto out; 33643c04ce01SMiao Xie } 33656ef5ed0dSJosef Bacik 33666ef5ed0dSJosef Bacik if (!objectid) 33671cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 33686ef5ed0dSJosef Bacik 336956e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 33703c04ce01SMiao Xie if (IS_ERR(new_root)) { 33713c04ce01SMiao Xie ret = PTR_ERR(new_root); 33723c04ce01SMiao Xie goto out; 33733c04ce01SMiao Xie } 33742a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 33752a2b5d62SJosef Bacik ret = -ENOENT; 33762a2b5d62SJosef Bacik goto out_free; 33772a2b5d62SJosef Bacik } 33786ef5ed0dSJosef Bacik 33796ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 33803c04ce01SMiao Xie if (!path) { 33813c04ce01SMiao Xie ret = -ENOMEM; 33822a2b5d62SJosef Bacik goto out_free; 33833c04ce01SMiao Xie } 33846ef5ed0dSJosef Bacik path->leave_spinning = 1; 33856ef5ed0dSJosef Bacik 33866ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 338798d5dc13STsutomu Itoh if (IS_ERR(trans)) { 33883c04ce01SMiao Xie ret = PTR_ERR(trans); 33892a2b5d62SJosef Bacik goto out_free; 33906ef5ed0dSJosef Bacik } 33916ef5ed0dSJosef Bacik 33920b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 33930b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 33946ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3395cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 33962a2b5d62SJosef Bacik btrfs_release_path(path); 33973a45bb20SJeff Mahoney btrfs_end_transaction(trans); 33980b246afaSJeff Mahoney btrfs_err(fs_info, 33995d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 34003c04ce01SMiao Xie ret = -ENOENT; 34012a2b5d62SJosef Bacik goto out_free; 34026ef5ed0dSJosef Bacik } 34036ef5ed0dSJosef Bacik 34046ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 34056ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 34066ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 34072a2b5d62SJosef Bacik btrfs_release_path(path); 34086ef5ed0dSJosef Bacik 34090b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 34103a45bb20SJeff Mahoney btrfs_end_transaction(trans); 34112a2b5d62SJosef Bacik out_free: 341200246528SJosef Bacik btrfs_put_root(new_root); 34132a2b5d62SJosef Bacik btrfs_free_path(path); 34143c04ce01SMiao Xie out: 34153c04ce01SMiao Xie mnt_drop_write_file(file); 34163c04ce01SMiao Xie return ret; 34176ef5ed0dSJosef Bacik } 34186ef5ed0dSJosef Bacik 3419c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3420bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3421bf5fc093SJosef Bacik { 342232da5386SDavid Sterba struct btrfs_block_group *block_group; 3423bf5fc093SJosef Bacik 3424bf5fc093SJosef Bacik space->total_bytes = 0; 3425bf5fc093SJosef Bacik space->used_bytes = 0; 3426bf5fc093SJosef Bacik space->flags = 0; 3427bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3428bf5fc093SJosef Bacik space->flags = block_group->flags; 3429b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3430bf38be65SDavid Sterba space->used_bytes += block_group->used; 3431bf5fc093SJosef Bacik } 3432bf5fc093SJosef Bacik } 3433bf5fc093SJosef Bacik 34342ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 34352ff7e61eSJeff Mahoney void __user *arg) 34361406e432SJosef Bacik { 34371406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 34381406e432SJosef Bacik struct btrfs_ioctl_space_info space; 34391406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 34407fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 344113f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 34421406e432SJosef Bacik struct btrfs_space_info *info; 3443315d8e98SColin Ian King static const u64 types[] = { 3444315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3445bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3446bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3447315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3448315d8e98SColin Ian King }; 3449bf5fc093SJosef Bacik int num_types = 4; 34507fde62bfSChris Mason int alloc_size; 34511406e432SJosef Bacik int ret = 0; 345251788b1bSDan Rosenberg u64 slot_count = 0; 3453bf5fc093SJosef Bacik int i, c; 34541406e432SJosef Bacik 34551406e432SJosef Bacik if (copy_from_user(&space_args, 34561406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 34571406e432SJosef Bacik sizeof(space_args))) 34581406e432SJosef Bacik return -EFAULT; 34591406e432SJosef Bacik 3460bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3461bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3462bf5fc093SJosef Bacik 3463bf5fc093SJosef Bacik info = NULL; 34647fde62bfSChris Mason rcu_read_lock(); 34650b246afaSJeff Mahoney list_for_each_entry_rcu(tmp, &fs_info->space_info, 3466bf5fc093SJosef Bacik list) { 3467bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3468bf5fc093SJosef Bacik info = tmp; 3469bf5fc093SJosef Bacik break; 3470bf5fc093SJosef Bacik } 3471bf5fc093SJosef Bacik } 34727fde62bfSChris Mason rcu_read_unlock(); 34731406e432SJosef Bacik 3474bf5fc093SJosef Bacik if (!info) 3475bf5fc093SJosef Bacik continue; 3476bf5fc093SJosef Bacik 3477bf5fc093SJosef Bacik down_read(&info->groups_sem); 3478bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3479bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3480bf5fc093SJosef Bacik slot_count++; 3481bf5fc093SJosef Bacik } 3482bf5fc093SJosef Bacik up_read(&info->groups_sem); 3483bf5fc093SJosef Bacik } 3484bf5fc093SJosef Bacik 348536523e95SDavid Sterba /* 348636523e95SDavid Sterba * Global block reserve, exported as a space_info 348736523e95SDavid Sterba */ 348836523e95SDavid Sterba slot_count++; 348936523e95SDavid Sterba 34907fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 34917fde62bfSChris Mason if (space_args.space_slots == 0) { 34927fde62bfSChris Mason space_args.total_spaces = slot_count; 34937fde62bfSChris Mason goto out; 34947fde62bfSChris Mason } 3495bf5fc093SJosef Bacik 349651788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3497bf5fc093SJosef Bacik 34987fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3499bf5fc093SJosef Bacik 35007fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 35017fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 35027fde62bfSChris Mason */ 350309cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 35047fde62bfSChris Mason return -ENOMEM; 35057fde62bfSChris Mason 35067fde62bfSChris Mason space_args.total_spaces = 0; 35078d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 35087fde62bfSChris Mason if (!dest) 35097fde62bfSChris Mason return -ENOMEM; 35107fde62bfSChris Mason dest_orig = dest; 35117fde62bfSChris Mason 35127fde62bfSChris Mason /* now we have a buffer to copy into */ 3513bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3514bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3515bf5fc093SJosef Bacik 351651788b1bSDan Rosenberg if (!slot_count) 351751788b1bSDan Rosenberg break; 351851788b1bSDan Rosenberg 3519bf5fc093SJosef Bacik info = NULL; 35201406e432SJosef Bacik rcu_read_lock(); 35210b246afaSJeff Mahoney list_for_each_entry_rcu(tmp, &fs_info->space_info, 3522bf5fc093SJosef Bacik list) { 3523bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3524bf5fc093SJosef Bacik info = tmp; 35257fde62bfSChris Mason break; 3526bf5fc093SJosef Bacik } 3527bf5fc093SJosef Bacik } 3528bf5fc093SJosef Bacik rcu_read_unlock(); 35297fde62bfSChris Mason 3530bf5fc093SJosef Bacik if (!info) 3531bf5fc093SJosef Bacik continue; 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])) { 3535c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3536c065f5b1SSu Yue &space); 35377fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 35381406e432SJosef Bacik dest++; 35391406e432SJosef Bacik space_args.total_spaces++; 354051788b1bSDan Rosenberg slot_count--; 35411406e432SJosef Bacik } 354251788b1bSDan Rosenberg if (!slot_count) 354351788b1bSDan Rosenberg break; 3544bf5fc093SJosef Bacik } 3545bf5fc093SJosef Bacik up_read(&info->groups_sem); 3546bf5fc093SJosef Bacik } 35471406e432SJosef Bacik 354836523e95SDavid Sterba /* 354936523e95SDavid Sterba * Add global block reserve 355036523e95SDavid Sterba */ 355136523e95SDavid Sterba if (slot_count) { 35520b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 355336523e95SDavid Sterba 355436523e95SDavid Sterba spin_lock(&block_rsv->lock); 355536523e95SDavid Sterba space.total_bytes = block_rsv->size; 355636523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 355736523e95SDavid Sterba spin_unlock(&block_rsv->lock); 355836523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 355936523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 356036523e95SDavid Sterba space_args.total_spaces++; 356136523e95SDavid Sterba } 356236523e95SDavid Sterba 35632eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 35647fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 35657fde62bfSChris Mason 35667fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 35677fde62bfSChris Mason ret = -EFAULT; 35687fde62bfSChris Mason 35697fde62bfSChris Mason kfree(dest_orig); 35707fde62bfSChris Mason out: 35717fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 35721406e432SJosef Bacik ret = -EFAULT; 35731406e432SJosef Bacik 35741406e432SJosef Bacik return ret; 35751406e432SJosef Bacik } 35761406e432SJosef Bacik 35779a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 35789a8c28beSMiao Xie void __user *argp) 357946204592SSage Weil { 358046204592SSage Weil struct btrfs_trans_handle *trans; 358146204592SSage Weil u64 transid; 3582db5b493aSTsutomu Itoh int ret; 358346204592SSage Weil 3584d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3585ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3586ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 358798d5dc13STsutomu Itoh return PTR_ERR(trans); 3588ff7c1d33SMiao Xie 3589ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3590ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3591ff7c1d33SMiao Xie goto out; 3592ff7c1d33SMiao Xie } 359346204592SSage Weil transid = trans->transid; 35943a45bb20SJeff Mahoney ret = btrfs_commit_transaction_async(trans, 0); 35958b2b2d3cSTsutomu Itoh if (ret) { 35963a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3597db5b493aSTsutomu Itoh return ret; 35988b2b2d3cSTsutomu Itoh } 3599ff7c1d33SMiao Xie out: 360046204592SSage Weil if (argp) 360146204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 360246204592SSage Weil return -EFAULT; 360346204592SSage Weil return 0; 360446204592SSage Weil } 360546204592SSage Weil 36062ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 36079a8c28beSMiao Xie void __user *argp) 360846204592SSage Weil { 360946204592SSage Weil u64 transid; 361046204592SSage Weil 361146204592SSage Weil if (argp) { 361246204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 361346204592SSage Weil return -EFAULT; 361446204592SSage Weil } else { 361546204592SSage Weil transid = 0; /* current trans */ 361646204592SSage Weil } 36172ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 361846204592SSage Weil } 361946204592SSage Weil 3620b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3621475f6387SJan Schmidt { 36220b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3623475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3624b8e95489SMiao Xie int ret; 3625475f6387SJan Schmidt 3626475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3627475f6387SJan Schmidt return -EPERM; 3628475f6387SJan Schmidt 3629475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3630475f6387SJan Schmidt if (IS_ERR(sa)) 3631475f6387SJan Schmidt return PTR_ERR(sa); 3632475f6387SJan Schmidt 3633b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3634b8e95489SMiao Xie ret = mnt_want_write_file(file); 3635b8e95489SMiao Xie if (ret) 3636b8e95489SMiao Xie goto out; 3637b8e95489SMiao Xie } 3638b8e95489SMiao Xie 36390b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 364063a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 364163a212abSStefan Behrens 0); 3642475f6387SJan Schmidt 36435afe6ce7SFilipe Manana /* 36445afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 36455afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 36465afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 36475afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 36485afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 36495afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 36505afe6ce7SFilipe Manana * previously (btrfs-progs does this). 36515afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 36525afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 36535afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 36545afe6ce7SFilipe Manana */ 36555afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3656475f6387SJan Schmidt ret = -EFAULT; 3657475f6387SJan Schmidt 3658b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3659b8e95489SMiao Xie mnt_drop_write_file(file); 3660b8e95489SMiao Xie out: 3661475f6387SJan Schmidt kfree(sa); 3662475f6387SJan Schmidt return ret; 3663475f6387SJan Schmidt } 3664475f6387SJan Schmidt 36652ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3666475f6387SJan Schmidt { 3667475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3668475f6387SJan Schmidt return -EPERM; 3669475f6387SJan Schmidt 36702ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3671475f6387SJan Schmidt } 3672475f6387SJan Schmidt 36732ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3674475f6387SJan Schmidt void __user *arg) 3675475f6387SJan Schmidt { 3676475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3677475f6387SJan Schmidt int ret; 3678475f6387SJan Schmidt 3679475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3680475f6387SJan Schmidt return -EPERM; 3681475f6387SJan Schmidt 3682475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3683475f6387SJan Schmidt if (IS_ERR(sa)) 3684475f6387SJan Schmidt return PTR_ERR(sa); 3685475f6387SJan Schmidt 36862ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3687475f6387SJan Schmidt 36884fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3689475f6387SJan Schmidt ret = -EFAULT; 3690475f6387SJan Schmidt 3691475f6387SJan Schmidt kfree(sa); 3692475f6387SJan Schmidt return ret; 3693475f6387SJan Schmidt } 3694475f6387SJan Schmidt 36952ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3696b27f7c0cSDavid Sterba void __user *arg) 3697c11d2c23SStefan Behrens { 3698c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3699c11d2c23SStefan Behrens int ret; 3700c11d2c23SStefan Behrens 3701c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3702c11d2c23SStefan Behrens if (IS_ERR(sa)) 3703c11d2c23SStefan Behrens return PTR_ERR(sa); 3704c11d2c23SStefan Behrens 3705b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3706b27f7c0cSDavid Sterba kfree(sa); 3707b27f7c0cSDavid Sterba return -EPERM; 3708b27f7c0cSDavid Sterba } 3709b27f7c0cSDavid Sterba 37102ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3711c11d2c23SStefan Behrens 3712eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3713c11d2c23SStefan Behrens ret = -EFAULT; 3714c11d2c23SStefan Behrens 3715c11d2c23SStefan Behrens kfree(sa); 3716c11d2c23SStefan Behrens return ret; 3717c11d2c23SStefan Behrens } 3718c11d2c23SStefan Behrens 37192ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 37202ff7e61eSJeff Mahoney void __user *arg) 37213f6bcfbdSStefan Behrens { 37223f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 37233f6bcfbdSStefan Behrens int ret; 37243f6bcfbdSStefan Behrens 37253f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 37263f6bcfbdSStefan Behrens return -EPERM; 37273f6bcfbdSStefan Behrens 37283f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 37293f6bcfbdSStefan Behrens if (IS_ERR(p)) 37303f6bcfbdSStefan Behrens return PTR_ERR(p); 37313f6bcfbdSStefan Behrens 37323f6bcfbdSStefan Behrens switch (p->cmd) { 37333f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3734bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3735adfa97cbSIlya Dryomov ret = -EROFS; 3736adfa97cbSIlya Dryomov goto out; 3737adfa97cbSIlya Dryomov } 3738171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3739e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 37403f6bcfbdSStefan Behrens } else { 37412ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3742171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 37433f6bcfbdSStefan Behrens } 37443f6bcfbdSStefan Behrens break; 37453f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 37460b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 37473f6bcfbdSStefan Behrens ret = 0; 37483f6bcfbdSStefan Behrens break; 37493f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 375017d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 375197282031SAnand Jain ret = 0; 37523f6bcfbdSStefan Behrens break; 37533f6bcfbdSStefan Behrens default: 37543f6bcfbdSStefan Behrens ret = -EINVAL; 37553f6bcfbdSStefan Behrens break; 37563f6bcfbdSStefan Behrens } 37573f6bcfbdSStefan Behrens 3758d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 37593f6bcfbdSStefan Behrens ret = -EFAULT; 3760adfa97cbSIlya Dryomov out: 37613f6bcfbdSStefan Behrens kfree(p); 37623f6bcfbdSStefan Behrens return ret; 37633f6bcfbdSStefan Behrens } 37643f6bcfbdSStefan Behrens 3765d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3766d7728c96SJan Schmidt { 3767d7728c96SJan Schmidt int ret = 0; 3768d7728c96SJan Schmidt int i; 3769740c3d22SChris Mason u64 rel_ptr; 3770d7728c96SJan Schmidt int size; 3771806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3772d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3773d7728c96SJan Schmidt struct btrfs_path *path; 3774d7728c96SJan Schmidt 377582b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3776d7728c96SJan Schmidt return -EPERM; 3777d7728c96SJan Schmidt 3778d7728c96SJan Schmidt path = btrfs_alloc_path(); 3779d7728c96SJan Schmidt if (!path) { 3780d7728c96SJan Schmidt ret = -ENOMEM; 3781d7728c96SJan Schmidt goto out; 3782d7728c96SJan Schmidt } 3783d7728c96SJan Schmidt 3784d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3785d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3786d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3787d7728c96SJan Schmidt ipa = NULL; 3788d7728c96SJan Schmidt goto out; 3789d7728c96SJan Schmidt } 3790d7728c96SJan Schmidt 3791d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3792d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3793d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3794d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3795d7728c96SJan Schmidt ipath = NULL; 3796d7728c96SJan Schmidt goto out; 3797d7728c96SJan Schmidt } 3798d7728c96SJan Schmidt 3799d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3800d7728c96SJan Schmidt if (ret < 0) 3801d7728c96SJan Schmidt goto out; 3802d7728c96SJan Schmidt 3803d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3804745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3805745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3806740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3807d7728c96SJan Schmidt } 3808d7728c96SJan Schmidt 3809718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3810718dc5faSOmar Sandoval ipath->fspath, size); 3811d7728c96SJan Schmidt if (ret) { 3812d7728c96SJan Schmidt ret = -EFAULT; 3813d7728c96SJan Schmidt goto out; 3814d7728c96SJan Schmidt } 3815d7728c96SJan Schmidt 3816d7728c96SJan Schmidt out: 3817d7728c96SJan Schmidt btrfs_free_path(path); 3818d7728c96SJan Schmidt free_ipath(ipath); 3819d7728c96SJan Schmidt kfree(ipa); 3820d7728c96SJan Schmidt 3821d7728c96SJan Schmidt return ret; 3822d7728c96SJan Schmidt } 3823d7728c96SJan Schmidt 3824d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3825d7728c96SJan Schmidt { 3826d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3827d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3828d7728c96SJan Schmidt 3829d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3830d7728c96SJan Schmidt inodes->bytes_left -= c; 3831d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3832d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3833d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3834d7728c96SJan Schmidt inodes->elem_cnt += 3; 3835d7728c96SJan Schmidt } else { 3836d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3837d7728c96SJan Schmidt inodes->bytes_left = 0; 3838d7728c96SJan Schmidt inodes->elem_missed += 3; 3839d7728c96SJan Schmidt } 3840d7728c96SJan Schmidt 3841d7728c96SJan Schmidt return 0; 3842d7728c96SJan Schmidt } 3843d7728c96SJan Schmidt 38442ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3845d24a67b2SZygo Blaxell void __user *arg, int version) 3846d7728c96SJan Schmidt { 3847d7728c96SJan Schmidt int ret = 0; 3848d7728c96SJan Schmidt int size; 3849d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3850d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3851d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3852d24a67b2SZygo Blaxell bool ignore_offset; 3853d7728c96SJan Schmidt 3854d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3855d7728c96SJan Schmidt return -EPERM; 3856d7728c96SJan Schmidt 3857d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 38587b9ea627SShailendra Verma if (IS_ERR(loi)) 38597b9ea627SShailendra Verma return PTR_ERR(loi); 3860d7728c96SJan Schmidt 3861d24a67b2SZygo Blaxell if (version == 1) { 3862d24a67b2SZygo Blaxell ignore_offset = false; 3863b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 3864d24a67b2SZygo Blaxell } else { 3865d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 3866d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 3867d24a67b2SZygo Blaxell ret = -EINVAL; 3868d24a67b2SZygo Blaxell goto out_loi; 3869d24a67b2SZygo Blaxell } 3870d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 3871d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 3872d24a67b2SZygo Blaxell ret = -EINVAL; 3873d24a67b2SZygo Blaxell goto out_loi; 3874d24a67b2SZygo Blaxell } 3875d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 3876b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 3877d24a67b2SZygo Blaxell } 3878d24a67b2SZygo Blaxell 3879d7728c96SJan Schmidt path = btrfs_alloc_path(); 3880d7728c96SJan Schmidt if (!path) { 3881d7728c96SJan Schmidt ret = -ENOMEM; 3882d7728c96SJan Schmidt goto out; 3883d7728c96SJan Schmidt } 3884d7728c96SJan Schmidt 3885d7728c96SJan Schmidt inodes = init_data_container(size); 3886d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3887d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3888d7728c96SJan Schmidt inodes = NULL; 3889d7728c96SJan Schmidt goto out; 3890d7728c96SJan Schmidt } 3891d7728c96SJan Schmidt 38922ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 3893d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 3894df031f07SLiu Bo if (ret == -EINVAL) 3895d7728c96SJan Schmidt ret = -ENOENT; 3896d7728c96SJan Schmidt if (ret < 0) 3897d7728c96SJan Schmidt goto out; 3898d7728c96SJan Schmidt 3899718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 3900718dc5faSOmar Sandoval size); 3901d7728c96SJan Schmidt if (ret) 3902d7728c96SJan Schmidt ret = -EFAULT; 3903d7728c96SJan Schmidt 3904d7728c96SJan Schmidt out: 3905d7728c96SJan Schmidt btrfs_free_path(path); 3906f54de068SDavid Sterba kvfree(inodes); 3907d24a67b2SZygo Blaxell out_loi: 3908d7728c96SJan Schmidt kfree(loi); 3909d7728c96SJan Schmidt 3910d7728c96SJan Schmidt return ret; 3911d7728c96SJan Schmidt } 3912d7728c96SJan Schmidt 3913008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 3914c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3915c9e9f97bSIlya Dryomov { 3916c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3917c9e9f97bSIlya Dryomov 3918c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3919c9e9f97bSIlya Dryomov 39203009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 3921837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3922837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3923837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3924a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3925a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3926837d5b6eSIlya Dryomov 3927c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3928c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3929c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 393019a39dceSIlya Dryomov 393119a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 393219a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 393319a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 3934c9e9f97bSIlya Dryomov } 3935c9e9f97bSIlya Dryomov 39369ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3937c9e9f97bSIlya Dryomov { 3938496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3939c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3940c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3941c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3942ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 3943c9e9f97bSIlya Dryomov int ret; 3944c9e9f97bSIlya Dryomov 3945c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3946c9e9f97bSIlya Dryomov return -EPERM; 3947c9e9f97bSIlya Dryomov 3948e54bfa31SLiu Bo ret = mnt_want_write_file(file); 39499ba1f6e4SLiu Bo if (ret) 39509ba1f6e4SLiu Bo return ret; 39519ba1f6e4SLiu Bo 3952ed0fb78fSIlya Dryomov again: 3953171938e5SDavid Sterba if (!test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3954c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3955ed0fb78fSIlya Dryomov need_unlock = true; 3956ed0fb78fSIlya Dryomov goto locked; 3957ed0fb78fSIlya Dryomov } 3958ed0fb78fSIlya Dryomov 3959ed0fb78fSIlya Dryomov /* 396001327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 3961ed0fb78fSIlya Dryomov * (1) some other op is running 3962ed0fb78fSIlya Dryomov * (2) balance is running 3963ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 3964ed0fb78fSIlya Dryomov */ 3965ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3966ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3967ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 39683009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 3969ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3970dccdb07bSDavid Sterba /* 3971dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 3972dccdb07bSDavid Sterba * we'll reexamine the status again. 3973dccdb07bSDavid Sterba */ 3974ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3975ed0fb78fSIlya Dryomov 3976ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 39773009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 3978ed0fb78fSIlya Dryomov /* this is (3) */ 3979ed0fb78fSIlya Dryomov need_unlock = false; 3980ed0fb78fSIlya Dryomov goto locked; 3981ed0fb78fSIlya Dryomov } 3982ed0fb78fSIlya Dryomov 3983ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3984ed0fb78fSIlya Dryomov goto again; 3985ed0fb78fSIlya Dryomov } else { 3986ed0fb78fSIlya Dryomov /* this is (2) */ 3987ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3988ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 3989ed0fb78fSIlya Dryomov goto out; 3990ed0fb78fSIlya Dryomov } 3991ed0fb78fSIlya Dryomov } else { 3992ed0fb78fSIlya Dryomov /* this is (1) */ 3993ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3994e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3995ed0fb78fSIlya Dryomov goto out; 3996ed0fb78fSIlya Dryomov } 3997ed0fb78fSIlya Dryomov 3998ed0fb78fSIlya Dryomov locked: 3999171938e5SDavid Sterba BUG_ON(!test_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)); 4000c9e9f97bSIlya Dryomov 4001c9e9f97bSIlya Dryomov if (arg) { 4002c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4003c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4004c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4005ed0fb78fSIlya Dryomov goto out_unlock; 4006c9e9f97bSIlya Dryomov } 4007de322263SIlya Dryomov 4008de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4009de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4010de322263SIlya Dryomov ret = -ENOTCONN; 4011de322263SIlya Dryomov goto out_bargs; 4012de322263SIlya Dryomov } 4013de322263SIlya Dryomov 4014de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4015de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4016de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4017de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4018de322263SIlya Dryomov 4019de322263SIlya Dryomov goto do_balance; 4020de322263SIlya Dryomov } 4021c9e9f97bSIlya Dryomov } else { 4022c9e9f97bSIlya Dryomov bargs = NULL; 4023c9e9f97bSIlya Dryomov } 4024c9e9f97bSIlya Dryomov 4025ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4026837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4027837d5b6eSIlya Dryomov goto out_bargs; 4028837d5b6eSIlya Dryomov } 4029837d5b6eSIlya Dryomov 40308d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4031c9e9f97bSIlya Dryomov if (!bctl) { 4032c9e9f97bSIlya Dryomov ret = -ENOMEM; 4033c9e9f97bSIlya Dryomov goto out_bargs; 4034c9e9f97bSIlya Dryomov } 4035c9e9f97bSIlya Dryomov 4036c9e9f97bSIlya Dryomov if (arg) { 4037c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4038c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4039c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4040c9e9f97bSIlya Dryomov 4041c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4042f43ffb60SIlya Dryomov } else { 4043f43ffb60SIlya Dryomov /* balance everything - no filters */ 4044f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4045c9e9f97bSIlya Dryomov } 4046c9e9f97bSIlya Dryomov 40478eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 40488eb93459SDavid Sterba ret = -EINVAL; 40490f89abf5SChristian Engelmayer goto out_bctl; 40508eb93459SDavid Sterba } 40518eb93459SDavid Sterba 4052de322263SIlya Dryomov do_balance: 4053c9e9f97bSIlya Dryomov /* 4054149196a2SDavid Sterba * Ownership of bctl and filesystem flag BTRFS_FS_EXCL_OP goes to 4055149196a2SDavid Sterba * btrfs_balance. bctl is freed in reset_balance_state, or, if 4056149196a2SDavid Sterba * restriper was paused all the way until unmount, in free_fs_info. 4057149196a2SDavid Sterba * The flag should be cleared after reset_balance_state. 4058c9e9f97bSIlya Dryomov */ 4059ed0fb78fSIlya Dryomov need_unlock = false; 4060ed0fb78fSIlya Dryomov 40616fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 40620f89abf5SChristian Engelmayer bctl = NULL; 4063ed0fb78fSIlya Dryomov 4064d00c2d9cSFilipe Manana if ((ret == 0 || ret == -ECANCELED) && arg) { 4065c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4066c9e9f97bSIlya Dryomov ret = -EFAULT; 4067c9e9f97bSIlya Dryomov } 4068c9e9f97bSIlya Dryomov 40690f89abf5SChristian Engelmayer out_bctl: 40700f89abf5SChristian Engelmayer kfree(bctl); 4071c9e9f97bSIlya Dryomov out_bargs: 4072c9e9f97bSIlya Dryomov kfree(bargs); 4073ed0fb78fSIlya Dryomov out_unlock: 4074c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4075ed0fb78fSIlya Dryomov if (need_unlock) 4076171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 4077ed0fb78fSIlya Dryomov out: 4078e54bfa31SLiu Bo mnt_drop_write_file(file); 4079c9e9f97bSIlya Dryomov return ret; 4080c9e9f97bSIlya Dryomov } 4081c9e9f97bSIlya Dryomov 40822ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4083837d5b6eSIlya Dryomov { 4084837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4085837d5b6eSIlya Dryomov return -EPERM; 4086837d5b6eSIlya Dryomov 4087837d5b6eSIlya Dryomov switch (cmd) { 4088837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 40890b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4090a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 40910b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4092837d5b6eSIlya Dryomov } 4093837d5b6eSIlya Dryomov 4094837d5b6eSIlya Dryomov return -EINVAL; 4095837d5b6eSIlya Dryomov } 4096837d5b6eSIlya Dryomov 40972ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 409819a39dceSIlya Dryomov void __user *arg) 409919a39dceSIlya Dryomov { 410019a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 410119a39dceSIlya Dryomov int ret = 0; 410219a39dceSIlya Dryomov 410319a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 410419a39dceSIlya Dryomov return -EPERM; 410519a39dceSIlya Dryomov 410619a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 410719a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 410819a39dceSIlya Dryomov ret = -ENOTCONN; 410919a39dceSIlya Dryomov goto out; 411019a39dceSIlya Dryomov } 411119a39dceSIlya Dryomov 41128d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 411319a39dceSIlya Dryomov if (!bargs) { 411419a39dceSIlya Dryomov ret = -ENOMEM; 411519a39dceSIlya Dryomov goto out; 411619a39dceSIlya Dryomov } 411719a39dceSIlya Dryomov 4118008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 411919a39dceSIlya Dryomov 412019a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 412119a39dceSIlya Dryomov ret = -EFAULT; 412219a39dceSIlya Dryomov 412319a39dceSIlya Dryomov kfree(bargs); 412419a39dceSIlya Dryomov out: 412519a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 412619a39dceSIlya Dryomov return ret; 412719a39dceSIlya Dryomov } 412819a39dceSIlya Dryomov 4129905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 41305d13a37bSArne Jansen { 41310b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41320b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41335d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 41345d13a37bSArne Jansen int ret; 41355d13a37bSArne Jansen 41365d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41375d13a37bSArne Jansen return -EPERM; 41385d13a37bSArne Jansen 4139905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4140905b0ddaSMiao Xie if (ret) 4141905b0ddaSMiao Xie return ret; 41425d13a37bSArne Jansen 41435d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4144905b0ddaSMiao Xie if (IS_ERR(sa)) { 4145905b0ddaSMiao Xie ret = PTR_ERR(sa); 4146905b0ddaSMiao Xie goto drop_write; 4147905b0ddaSMiao Xie } 41485d13a37bSArne Jansen 41490b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 41505d13a37bSArne Jansen 41515d13a37bSArne Jansen switch (sa->cmd) { 41525d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4153340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 41545d13a37bSArne Jansen break; 41555d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4156340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 41575d13a37bSArne Jansen break; 41585d13a37bSArne Jansen default: 41595d13a37bSArne Jansen ret = -EINVAL; 41605d13a37bSArne Jansen break; 41615d13a37bSArne Jansen } 41625d13a37bSArne Jansen 41635d13a37bSArne Jansen kfree(sa); 41640b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4165905b0ddaSMiao Xie drop_write: 4166905b0ddaSMiao Xie mnt_drop_write_file(file); 41675d13a37bSArne Jansen return ret; 41685d13a37bSArne Jansen } 41695d13a37bSArne Jansen 4170905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 41715d13a37bSArne Jansen { 41720b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41730b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41740b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 41755d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 41765d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41775d13a37bSArne Jansen int ret; 41785d13a37bSArne Jansen int err; 41795d13a37bSArne Jansen 41805d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41815d13a37bSArne Jansen return -EPERM; 41825d13a37bSArne Jansen 4183905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4184905b0ddaSMiao Xie if (ret) 4185905b0ddaSMiao Xie return ret; 41865d13a37bSArne Jansen 41875d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4188905b0ddaSMiao Xie if (IS_ERR(sa)) { 4189905b0ddaSMiao Xie ret = PTR_ERR(sa); 4190905b0ddaSMiao Xie goto drop_write; 4191905b0ddaSMiao Xie } 41925d13a37bSArne Jansen 41935d13a37bSArne Jansen trans = btrfs_join_transaction(root); 41945d13a37bSArne Jansen if (IS_ERR(trans)) { 41955d13a37bSArne Jansen ret = PTR_ERR(trans); 41965d13a37bSArne Jansen goto out; 41975d13a37bSArne Jansen } 41985d13a37bSArne Jansen 41995d13a37bSArne Jansen if (sa->assign) { 42009f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 42015d13a37bSArne Jansen } else { 420239616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 42035d13a37bSArne Jansen } 42045d13a37bSArne Jansen 4205e082f563SQu Wenruo /* update qgroup status and info */ 4206280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4207e082f563SQu Wenruo if (err < 0) 42080b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4209ad8403dfSAnand Jain "failed to update qgroup status and info"); 42103a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 42115d13a37bSArne Jansen if (err && !ret) 42125d13a37bSArne Jansen ret = err; 42135d13a37bSArne Jansen 42145d13a37bSArne Jansen out: 42155d13a37bSArne Jansen kfree(sa); 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_create(struct file *file, void __user *arg) 42225d13a37bSArne Jansen { 42230b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42240b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42255d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 42265d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42275d13a37bSArne Jansen int ret; 42285d13a37bSArne Jansen int err; 42295d13a37bSArne Jansen 42305d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42315d13a37bSArne Jansen return -EPERM; 42325d13a37bSArne Jansen 4233905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4234905b0ddaSMiao Xie if (ret) 4235905b0ddaSMiao Xie return ret; 42365d13a37bSArne Jansen 42375d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4238905b0ddaSMiao Xie if (IS_ERR(sa)) { 4239905b0ddaSMiao Xie ret = PTR_ERR(sa); 4240905b0ddaSMiao Xie goto drop_write; 4241905b0ddaSMiao Xie } 42425d13a37bSArne Jansen 4243d86e56cfSMiao Xie if (!sa->qgroupid) { 4244d86e56cfSMiao Xie ret = -EINVAL; 4245d86e56cfSMiao Xie goto out; 4246d86e56cfSMiao Xie } 4247d86e56cfSMiao Xie 42485d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42495d13a37bSArne Jansen if (IS_ERR(trans)) { 42505d13a37bSArne Jansen ret = PTR_ERR(trans); 42515d13a37bSArne Jansen goto out; 42525d13a37bSArne Jansen } 42535d13a37bSArne Jansen 42545d13a37bSArne Jansen if (sa->create) { 425549a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 42565d13a37bSArne Jansen } else { 42573efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 42585d13a37bSArne Jansen } 42595d13a37bSArne Jansen 42603a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 42615d13a37bSArne Jansen if (err && !ret) 42625d13a37bSArne Jansen ret = err; 42635d13a37bSArne Jansen 42645d13a37bSArne Jansen out: 42655d13a37bSArne Jansen kfree(sa); 4266905b0ddaSMiao Xie drop_write: 4267905b0ddaSMiao Xie mnt_drop_write_file(file); 42685d13a37bSArne Jansen return ret; 42695d13a37bSArne Jansen } 42705d13a37bSArne Jansen 4271905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 42725d13a37bSArne Jansen { 42730b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42740b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42755d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 42765d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42775d13a37bSArne Jansen int ret; 42785d13a37bSArne Jansen int err; 42795d13a37bSArne Jansen u64 qgroupid; 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 42945d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42955d13a37bSArne Jansen if (IS_ERR(trans)) { 42965d13a37bSArne Jansen ret = PTR_ERR(trans); 42975d13a37bSArne Jansen goto out; 42985d13a37bSArne Jansen } 42995d13a37bSArne Jansen 43005d13a37bSArne Jansen qgroupid = sa->qgroupid; 43015d13a37bSArne Jansen if (!qgroupid) { 43025d13a37bSArne Jansen /* take the current subvol as qgroup */ 43035d13a37bSArne Jansen qgroupid = root->root_key.objectid; 43045d13a37bSArne Jansen } 43055d13a37bSArne Jansen 4306f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 43075d13a37bSArne Jansen 43083a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 43095d13a37bSArne Jansen if (err && !ret) 43105d13a37bSArne Jansen ret = err; 43115d13a37bSArne Jansen 43125d13a37bSArne Jansen out: 43135d13a37bSArne Jansen kfree(sa); 4314905b0ddaSMiao Xie drop_write: 4315905b0ddaSMiao Xie mnt_drop_write_file(file); 43165d13a37bSArne Jansen return ret; 43175d13a37bSArne Jansen } 43185d13a37bSArne Jansen 43192f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 43202f232036SJan Schmidt { 43210b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43220b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 43232f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 43242f232036SJan Schmidt int ret; 43252f232036SJan Schmidt 43262f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 43272f232036SJan Schmidt return -EPERM; 43282f232036SJan Schmidt 43292f232036SJan Schmidt ret = mnt_want_write_file(file); 43302f232036SJan Schmidt if (ret) 43312f232036SJan Schmidt return ret; 43322f232036SJan Schmidt 43332f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 43342f232036SJan Schmidt if (IS_ERR(qsa)) { 43352f232036SJan Schmidt ret = PTR_ERR(qsa); 43362f232036SJan Schmidt goto drop_write; 43372f232036SJan Schmidt } 43382f232036SJan Schmidt 43392f232036SJan Schmidt if (qsa->flags) { 43402f232036SJan Schmidt ret = -EINVAL; 43412f232036SJan Schmidt goto out; 43422f232036SJan Schmidt } 43432f232036SJan Schmidt 43440b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 43452f232036SJan Schmidt 43462f232036SJan Schmidt out: 43472f232036SJan Schmidt kfree(qsa); 43482f232036SJan Schmidt drop_write: 43492f232036SJan Schmidt mnt_drop_write_file(file); 43502f232036SJan Schmidt return ret; 43512f232036SJan Schmidt } 43522f232036SJan Schmidt 4353b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4354b929c1d8SMarcos Paulo de Souza void __user *arg) 43552f232036SJan Schmidt { 43562f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 43572f232036SJan Schmidt int ret = 0; 43582f232036SJan Schmidt 43592f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 43602f232036SJan Schmidt return -EPERM; 43612f232036SJan Schmidt 43628d2db785SDavid Sterba qsa = kzalloc(sizeof(*qsa), GFP_KERNEL); 43632f232036SJan Schmidt if (!qsa) 43642f232036SJan Schmidt return -ENOMEM; 43652f232036SJan Schmidt 43660b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 43672f232036SJan Schmidt qsa->flags = 1; 43680b246afaSJeff Mahoney qsa->progress = fs_info->qgroup_rescan_progress.objectid; 43692f232036SJan Schmidt } 43702f232036SJan Schmidt 43712f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 43722f232036SJan Schmidt ret = -EFAULT; 43732f232036SJan Schmidt 43742f232036SJan Schmidt kfree(qsa); 43752f232036SJan Schmidt return ret; 43762f232036SJan Schmidt } 43772f232036SJan Schmidt 4378b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4379b929c1d8SMarcos Paulo de Souza void __user *arg) 438057254b6eSJan Schmidt { 438157254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 438257254b6eSJan Schmidt return -EPERM; 438357254b6eSJan Schmidt 43840b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 438557254b6eSJan Schmidt } 438657254b6eSJan Schmidt 4387abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4388abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 43898ea05e3aSAlexander Block { 4390496ad9aaSAl Viro struct inode *inode = file_inode(file); 43910b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 43928ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 43938ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 43948ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 439595582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 43968ea05e3aSAlexander Block int ret = 0; 4397dd5f9615SStefan Behrens int received_uuid_changed; 43988ea05e3aSAlexander Block 4399bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 4400bd60ea0fSDavid Sterba return -EPERM; 4401bd60ea0fSDavid Sterba 44028ea05e3aSAlexander Block ret = mnt_want_write_file(file); 44038ea05e3aSAlexander Block if (ret < 0) 44048ea05e3aSAlexander Block return ret; 44058ea05e3aSAlexander Block 44060b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 44078ea05e3aSAlexander Block 44084a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 44098ea05e3aSAlexander Block ret = -EINVAL; 44108ea05e3aSAlexander Block goto out; 44118ea05e3aSAlexander Block } 44128ea05e3aSAlexander Block 44138ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 44148ea05e3aSAlexander Block ret = -EROFS; 44158ea05e3aSAlexander Block goto out; 44168ea05e3aSAlexander Block } 44178ea05e3aSAlexander Block 4418dd5f9615SStefan Behrens /* 4419dd5f9615SStefan Behrens * 1 - root item 4420dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4421dd5f9615SStefan Behrens */ 4422dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 44238ea05e3aSAlexander Block if (IS_ERR(trans)) { 44248ea05e3aSAlexander Block ret = PTR_ERR(trans); 44258ea05e3aSAlexander Block trans = NULL; 44268ea05e3aSAlexander Block goto out; 44278ea05e3aSAlexander Block } 44288ea05e3aSAlexander Block 44298ea05e3aSAlexander Block sa->rtransid = trans->transid; 44308ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 44318ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 44328ea05e3aSAlexander Block 4433dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4434dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4435dd5f9615SStefan Behrens if (received_uuid_changed && 4436d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4437d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4438dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4439dd5f9615SStefan Behrens root->root_key.objectid); 4440d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4441d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4442d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4443d87ff758SNikolay Borisov goto out; 4444d87ff758SNikolay Borisov } 4445d87ff758SNikolay Borisov } 44468ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 44478ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 44488ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 44493cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 44503cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 44513cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 44523cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 44538ea05e3aSAlexander Block 44540b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 44558ea05e3aSAlexander Block &root->root_key, &root->root_item); 44568ea05e3aSAlexander Block if (ret < 0) { 44573a45bb20SJeff Mahoney btrfs_end_transaction(trans); 44588ea05e3aSAlexander Block goto out; 4459dd5f9615SStefan Behrens } 4460dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4461cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4462dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4463dd5f9615SStefan Behrens root->root_key.objectid); 4464dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 446566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4466efd38150SNikolay Borisov btrfs_end_transaction(trans); 4467dd5f9615SStefan Behrens goto out; 4468dd5f9615SStefan Behrens } 4469dd5f9615SStefan Behrens } 44703a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4471abccd00fSHugo Mills out: 44720b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4473abccd00fSHugo Mills mnt_drop_write_file(file); 4474abccd00fSHugo Mills return ret; 4475abccd00fSHugo Mills } 4476abccd00fSHugo Mills 4477abccd00fSHugo Mills #ifdef CONFIG_64BIT 4478abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4479abccd00fSHugo Mills void __user *arg) 4480abccd00fSHugo Mills { 4481abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4482abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4483abccd00fSHugo Mills int ret = 0; 4484abccd00fSHugo Mills 4485abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 44867b9ea627SShailendra Verma if (IS_ERR(args32)) 44877b9ea627SShailendra Verma return PTR_ERR(args32); 4488abccd00fSHugo Mills 44898d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 449084dbeb87SDan Carpenter if (!args64) { 449184dbeb87SDan Carpenter ret = -ENOMEM; 4492abccd00fSHugo Mills goto out; 4493abccd00fSHugo Mills } 4494abccd00fSHugo Mills 4495abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4496abccd00fSHugo Mills args64->stransid = args32->stransid; 4497abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4498abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4499abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4500abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4501abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4502abccd00fSHugo Mills args64->flags = args32->flags; 4503abccd00fSHugo Mills 4504abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4505abccd00fSHugo Mills if (ret) 4506abccd00fSHugo Mills goto out; 4507abccd00fSHugo Mills 4508abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4509abccd00fSHugo Mills args32->stransid = args64->stransid; 4510abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4511abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4512abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4513abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4514abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4515abccd00fSHugo Mills args32->flags = args64->flags; 4516abccd00fSHugo Mills 4517abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4518abccd00fSHugo Mills if (ret) 4519abccd00fSHugo Mills ret = -EFAULT; 4520abccd00fSHugo Mills 4521abccd00fSHugo Mills out: 4522abccd00fSHugo Mills kfree(args32); 4523abccd00fSHugo Mills kfree(args64); 4524abccd00fSHugo Mills return ret; 4525abccd00fSHugo Mills } 4526abccd00fSHugo Mills #endif 4527abccd00fSHugo Mills 4528abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4529abccd00fSHugo Mills void __user *arg) 4530abccd00fSHugo Mills { 4531abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4532abccd00fSHugo Mills int ret = 0; 4533abccd00fSHugo Mills 4534abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 45357b9ea627SShailendra Verma if (IS_ERR(sa)) 45367b9ea627SShailendra Verma return PTR_ERR(sa); 4537abccd00fSHugo Mills 4538abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4539abccd00fSHugo Mills 4540abccd00fSHugo Mills if (ret) 4541abccd00fSHugo Mills goto out; 4542abccd00fSHugo Mills 45438ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 45448ea05e3aSAlexander Block if (ret) 45458ea05e3aSAlexander Block ret = -EFAULT; 45468ea05e3aSAlexander Block 45478ea05e3aSAlexander Block out: 45488ea05e3aSAlexander Block kfree(sa); 45498ea05e3aSAlexander Block return ret; 45508ea05e3aSAlexander Block } 45518ea05e3aSAlexander Block 4552b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4553b929c1d8SMarcos Paulo de Souza void __user *arg) 4554867ab667Sjeff.liu { 4555a1b83ac5SAnand Jain size_t len; 4556867ab667Sjeff.liu int ret; 4557a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4558a1b83ac5SAnand Jain 45590b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 45600b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 45610b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4562a1b83ac5SAnand Jain 4563a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4564867ab667Sjeff.liu 4565867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 45660b246afaSJeff Mahoney btrfs_warn(fs_info, 45670b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 45680b246afaSJeff Mahoney --len); 4569867ab667Sjeff.liu } 4570867ab667Sjeff.liu 4571867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4572867ab667Sjeff.liu 4573867ab667Sjeff.liu return ret ? -EFAULT : 0; 4574867ab667Sjeff.liu } 4575867ab667Sjeff.liu 4576a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4577a8bfd4abSjeff.liu { 45780b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45790b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45800b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 45810b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4582a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4583a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4584a8bfd4abSjeff.liu int ret; 4585a8bfd4abSjeff.liu 4586a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4587a8bfd4abSjeff.liu return -EPERM; 4588a8bfd4abSjeff.liu 4589a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4590a8bfd4abSjeff.liu return -EFAULT; 4591a8bfd4abSjeff.liu 4592a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 45930b246afaSJeff Mahoney btrfs_err(fs_info, 45945d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4595a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4596a8bfd4abSjeff.liu return -EINVAL; 4597a8bfd4abSjeff.liu } 4598a8bfd4abSjeff.liu 4599a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4600a8bfd4abSjeff.liu if (ret) 4601a8bfd4abSjeff.liu return ret; 4602a8bfd4abSjeff.liu 4603a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4604a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4605a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4606a8bfd4abSjeff.liu goto out_unlock; 4607a8bfd4abSjeff.liu } 4608a8bfd4abSjeff.liu 46090b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4610a8bfd4abSjeff.liu strcpy(super_block->label, label); 46110b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 46123a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4613a8bfd4abSjeff.liu 4614a8bfd4abSjeff.liu out_unlock: 4615a8bfd4abSjeff.liu mnt_drop_write_file(file); 4616a8bfd4abSjeff.liu return ret; 4617a8bfd4abSjeff.liu } 4618a8bfd4abSjeff.liu 46192eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 46202eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 46212eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 46222eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 46232eaa055fSJeff Mahoney 4624d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 46252eaa055fSJeff Mahoney { 46264d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 46272eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 46282eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 46292eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 46302eaa055fSJeff Mahoney }; 46312eaa055fSJeff Mahoney 46322eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 46332eaa055fSJeff Mahoney return -EFAULT; 46342eaa055fSJeff Mahoney 46352eaa055fSJeff Mahoney return 0; 46362eaa055fSJeff Mahoney } 46372eaa055fSJeff Mahoney 4638b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4639b929c1d8SMarcos Paulo de Souza void __user *arg) 46402eaa055fSJeff Mahoney { 46410b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 46422eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 46432eaa055fSJeff Mahoney 46442eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 46452eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 46462eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 46472eaa055fSJeff Mahoney 46482eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 46492eaa055fSJeff Mahoney return -EFAULT; 46502eaa055fSJeff Mahoney 46512eaa055fSJeff Mahoney return 0; 46522eaa055fSJeff Mahoney } 46532eaa055fSJeff Mahoney 46542ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 46553b02a68aSJeff Mahoney enum btrfs_feature_set set, 46562eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 46572eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 46582eaa055fSJeff Mahoney { 4659f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 46603b02a68aSJeff Mahoney char *names; 46612eaa055fSJeff Mahoney u64 disallowed, unsupported; 46622eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 46632eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 46642eaa055fSJeff Mahoney 46652eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 46662eaa055fSJeff Mahoney if (unsupported) { 46673b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 46683b02a68aSJeff Mahoney if (names) { 46690b246afaSJeff Mahoney btrfs_warn(fs_info, 46703b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 46713b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46723b02a68aSJeff Mahoney kfree(names); 46733b02a68aSJeff Mahoney } else 46740b246afaSJeff Mahoney btrfs_warn(fs_info, 46752eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 46762eaa055fSJeff Mahoney type, unsupported); 46772eaa055fSJeff Mahoney return -EOPNOTSUPP; 46782eaa055fSJeff Mahoney } 46792eaa055fSJeff Mahoney 46802eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 46812eaa055fSJeff Mahoney if (disallowed) { 46823b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 46833b02a68aSJeff Mahoney if (names) { 46840b246afaSJeff Mahoney btrfs_warn(fs_info, 46853b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 46863b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46873b02a68aSJeff Mahoney kfree(names); 46883b02a68aSJeff Mahoney } else 46890b246afaSJeff Mahoney btrfs_warn(fs_info, 46902eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 46912eaa055fSJeff Mahoney type, disallowed); 46922eaa055fSJeff Mahoney return -EPERM; 46932eaa055fSJeff Mahoney } 46942eaa055fSJeff Mahoney 46952eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 46962eaa055fSJeff Mahoney if (disallowed) { 46973b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 46983b02a68aSJeff Mahoney if (names) { 46990b246afaSJeff Mahoney btrfs_warn(fs_info, 47003b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 47013b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47023b02a68aSJeff Mahoney kfree(names); 47033b02a68aSJeff Mahoney } else 47040b246afaSJeff Mahoney btrfs_warn(fs_info, 47052eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 47062eaa055fSJeff Mahoney type, disallowed); 47072eaa055fSJeff Mahoney return -EPERM; 47082eaa055fSJeff Mahoney } 47092eaa055fSJeff Mahoney 47102eaa055fSJeff Mahoney return 0; 47112eaa055fSJeff Mahoney } 47122eaa055fSJeff Mahoney 47132ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 47142ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 47152eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 47162eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 47172eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 47182eaa055fSJeff Mahoney 47192eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 47202eaa055fSJeff Mahoney { 47210b246afaSJeff Mahoney struct inode *inode = file_inode(file); 47220b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 47230b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 47240b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 47252eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 47262eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 47272eaa055fSJeff Mahoney u64 newflags; 47282eaa055fSJeff Mahoney int ret; 47292eaa055fSJeff Mahoney 47302eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 47312eaa055fSJeff Mahoney return -EPERM; 47322eaa055fSJeff Mahoney 47332eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 47342eaa055fSJeff Mahoney return -EFAULT; 47352eaa055fSJeff Mahoney 47362eaa055fSJeff Mahoney /* Nothing to do */ 47372eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 47382eaa055fSJeff Mahoney !flags[0].incompat_flags) 47392eaa055fSJeff Mahoney return 0; 47402eaa055fSJeff Mahoney 47412ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 47422eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 47432eaa055fSJeff Mahoney if (ret) 47442eaa055fSJeff Mahoney return ret; 47452eaa055fSJeff Mahoney 47462ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 47472eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 47482eaa055fSJeff Mahoney if (ret) 47492eaa055fSJeff Mahoney return ret; 47502eaa055fSJeff Mahoney 47512ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 47522eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 47532eaa055fSJeff Mahoney if (ret) 47542eaa055fSJeff Mahoney return ret; 47552eaa055fSJeff Mahoney 47567ab19625SDavid Sterba ret = mnt_want_write_file(file); 47577ab19625SDavid Sterba if (ret) 47587ab19625SDavid Sterba return ret; 47597ab19625SDavid Sterba 47608051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 47617ab19625SDavid Sterba if (IS_ERR(trans)) { 47627ab19625SDavid Sterba ret = PTR_ERR(trans); 47637ab19625SDavid Sterba goto out_drop_write; 47647ab19625SDavid Sterba } 47652eaa055fSJeff Mahoney 47660b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 47672eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 47682eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 47692eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 47702eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 47712eaa055fSJeff Mahoney 47722eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 47732eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 47742eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 47752eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 47762eaa055fSJeff Mahoney 47772eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 47782eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 47792eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 47802eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 47810b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 47822eaa055fSJeff Mahoney 47833a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 47847ab19625SDavid Sterba out_drop_write: 47857ab19625SDavid Sterba mnt_drop_write_file(file); 47867ab19625SDavid Sterba 47877ab19625SDavid Sterba return ret; 47882eaa055fSJeff Mahoney } 47892eaa055fSJeff Mahoney 47902351f431SJosef Bacik static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) 47912351f431SJosef Bacik { 47922351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 47932351f431SJosef Bacik int ret; 47942351f431SJosef Bacik 47952351f431SJosef Bacik if (compat) { 47962351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 47972351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 47982351f431SJosef Bacik 47992351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 48002351f431SJosef Bacik if (ret) 48012351f431SJosef Bacik return -EFAULT; 48022351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 48032351f431SJosef Bacik if (!arg) 48042351f431SJosef Bacik return -ENOMEM; 48052351f431SJosef Bacik arg->send_fd = args32.send_fd; 48062351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 48072351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 48082351f431SJosef Bacik arg->parent_root = args32.parent_root; 48092351f431SJosef Bacik arg->flags = args32.flags; 48102351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 48112351f431SJosef Bacik sizeof(args32.reserved)); 48122351f431SJosef Bacik #else 48132351f431SJosef Bacik return -ENOTTY; 48142351f431SJosef Bacik #endif 48152351f431SJosef Bacik } else { 48162351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 48172351f431SJosef Bacik if (IS_ERR(arg)) 48182351f431SJosef Bacik return PTR_ERR(arg); 48192351f431SJosef Bacik } 48202351f431SJosef Bacik ret = btrfs_ioctl_send(file, arg); 48212351f431SJosef Bacik kfree(arg); 48222351f431SJosef Bacik return ret; 48232351f431SJosef Bacik } 48242351f431SJosef Bacik 4825f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4826f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4827f46b5a66SChristoph Hellwig { 48280b246afaSJeff Mahoney struct inode *inode = file_inode(file); 48290b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 48300b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 48314bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4832f46b5a66SChristoph Hellwig 4833f46b5a66SChristoph Hellwig switch (cmd) { 48346cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 48356cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 48366cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 48376cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 48386cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 48396cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 484040cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4841b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 484240cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 484340cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4844f7039b1dSLi Dongyang case FITRIM: 4845b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4846f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4847fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4848fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4849fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 48503de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4851fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 48526f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 48536f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 485476dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4855949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4856949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4857949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 48580caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 48590caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 48600caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 48610caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 48626ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 48636ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4864f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 48651e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 48661e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 48671e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4868f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4869198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4870f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 48712ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 4872f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4873da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 48746b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 48756b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 4876475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 48772ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 4878475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 48792ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 4880f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 48819ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4882ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4883ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4884cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 4885cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 4886ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4887ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4888d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4889d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4890d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4891d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 4892d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 4893d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 48941406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 48952ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 48969b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 48979b199859SFilipe David Borba Manana int ret; 48989b199859SFilipe David Borba Manana 489982b3e53bSNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, -1); 49009b199859SFilipe David Borba Manana if (ret) 49019b199859SFilipe David Borba Manana return ret; 49020b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 49032fad4e83SDavid Sterba /* 49042fad4e83SDavid Sterba * The transaction thread may want to do more work, 490501327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 49062fad4e83SDavid Sterba * processing uncleaned subvols. 49072fad4e83SDavid Sterba */ 49080b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 49099b199859SFilipe David Borba Manana return ret; 49109b199859SFilipe David Borba Manana } 491146204592SSage Weil case BTRFS_IOC_START_SYNC: 49129a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 491346204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 49142ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 4915475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4916b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4917475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 49182ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 4919475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 49202ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 4921c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 49229ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4923837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 49242ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 492519a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 49262ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 49278ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 49288ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 4929abccd00fSHugo Mills #ifdef CONFIG_64BIT 4930abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 4931abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 4932abccd00fSHugo Mills #endif 493331db9f7cSAlexander Block case BTRFS_IOC_SEND: 49342351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, false); 49352351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 49362351f431SJosef Bacik case BTRFS_IOC_SEND_32: 49372351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, true); 49382351f431SJosef Bacik #endif 4939c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 49402ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 49415d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4942905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 49435d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4944905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 49455d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4946905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 49475d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4948905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 49492f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 49502f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 49512f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 4952b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 495357254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 4954b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 49553f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 49562ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 49572eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 4958d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 49592eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 4960b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 49612eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 49622eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 4963e4202ac9SDavid Sterba case FS_IOC_FSGETXATTR: 4964e4202ac9SDavid Sterba return btrfs_ioctl_fsgetxattr(file, argp); 4965025f2121SDavid Sterba case FS_IOC_FSSETXATTR: 4966025f2121SDavid Sterba return btrfs_ioctl_fssetxattr(file, argp); 4967b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 4968b64ec075STomohiro Misono return btrfs_ioctl_get_subvol_info(file, argp); 496942e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 497042e4b520STomohiro Misono return btrfs_ioctl_get_subvol_rootref(file, argp); 497123d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 497223d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 4973f46b5a66SChristoph Hellwig } 4974f46b5a66SChristoph Hellwig 4975f46b5a66SChristoph Hellwig return -ENOTTY; 4976f46b5a66SChristoph Hellwig } 49774c63c245SLuke Dashjr 49784c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 49794c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 49804c63c245SLuke Dashjr { 49812a362249SJeff Mahoney /* 49822a362249SJeff Mahoney * These all access 32-bit values anyway so no further 49832a362249SJeff Mahoney * handling is necessary. 49842a362249SJeff Mahoney */ 49854c63c245SLuke Dashjr switch (cmd) { 49864c63c245SLuke Dashjr case FS_IOC32_GETFLAGS: 49874c63c245SLuke Dashjr cmd = FS_IOC_GETFLAGS; 49884c63c245SLuke Dashjr break; 49894c63c245SLuke Dashjr case FS_IOC32_SETFLAGS: 49904c63c245SLuke Dashjr cmd = FS_IOC_SETFLAGS; 49914c63c245SLuke Dashjr break; 49924c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 49934c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 49944c63c245SLuke Dashjr break; 49954c63c245SLuke Dashjr } 49964c63c245SLuke Dashjr 49974c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 49984c63c245SLuke Dashjr } 49994c63c245SLuke Dashjr #endif 5000