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); 621e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &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 6319631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 6329631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 6338e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 6348e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 6358e8a1e31SJosef Bacik goto fail; 6368e8a1e31SJosef Bacik } 637f46b5a66SChristoph Hellwig 638f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 639f46b5a66SChristoph Hellwig 64049a3c4d9SDavid Sterba inode_item = &root_item->inode; 6413cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6423cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6433cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 644da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6450b246afaSJeff Mahoney fs_info->nodesize); 6463cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 647f46b5a66SChristoph Hellwig 64849a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 64949a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6503cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 65108fe4db1SLi Zefan 65249a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 65349a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 65449a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 65549a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 65649a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 65749a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 658f46b5a66SChristoph Hellwig 65949a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 66049a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 661807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 66249a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 66349a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 66449a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 66549a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 66649a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 667f46b5a66SChristoph Hellwig 668925baeddSChris Mason btrfs_tree_unlock(leaf); 669f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 670f46b5a66SChristoph Hellwig leaf = NULL; 671f46b5a66SChristoph Hellwig 67249a3c4d9SDavid Sterba btrfs_set_root_dirid(root_item, new_dirid); 673f46b5a66SChristoph Hellwig 674f46b5a66SChristoph Hellwig key.objectid = objectid; 6755d4f98a2SYan Zheng key.offset = 0; 676962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 6770b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 67849a3c4d9SDavid Sterba root_item); 679f46b5a66SChristoph Hellwig if (ret) 680f46b5a66SChristoph Hellwig goto fail; 681f46b5a66SChristoph Hellwig 68276dda93cSYan, Zheng key.offset = (u64)-1; 6832dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 68479787eaaSJeff Mahoney if (IS_ERR(new_root)) { 6852dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 68679787eaaSJeff Mahoney ret = PTR_ERR(new_root); 68766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 68879787eaaSJeff Mahoney goto fail; 68979787eaaSJeff Mahoney } 6902dfb1e43SQu Wenruo /* Freeing will be done in btrfs_put_root() of new_root */ 6912dfb1e43SQu Wenruo anon_dev = 0; 69276dda93cSYan, Zheng 69376dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 69476dda93cSYan, Zheng 69563541927SFilipe David Borba Manana ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); 69600246528SJosef Bacik btrfs_put_root(new_root); 697ce598979SMark Fasheh if (ret) { 698ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 69966642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 700ce598979SMark Fasheh goto fail; 701ce598979SMark Fasheh } 702ce598979SMark Fasheh 703f32e48e9SChandan Rajendra mutex_lock(&new_root->objectid_mutex); 704f32e48e9SChandan Rajendra new_root->highest_objectid = new_dirid; 705f32e48e9SChandan Rajendra mutex_unlock(&new_root->objectid_mutex); 706f32e48e9SChandan Rajendra 707f46b5a66SChristoph Hellwig /* 708f46b5a66SChristoph Hellwig * insert the directory item 709f46b5a66SChristoph Hellwig */ 710877574e2SNikolay Borisov ret = btrfs_set_inode_index(BTRFS_I(dir), &index); 71179787eaaSJeff Mahoney if (ret) { 71266642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 71379787eaaSJeff Mahoney goto fail; 71479787eaaSJeff Mahoney } 7153de4586cSChris Mason 716684572dfSLu Fengqi ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key, 7173de4586cSChris Mason BTRFS_FT_DIR, index); 71879787eaaSJeff Mahoney if (ret) { 71966642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 720f46b5a66SChristoph Hellwig goto fail; 72179787eaaSJeff Mahoney } 7220660b5afSChris Mason 7236ef06d27SNikolay Borisov btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); 72452c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 725c7e54b51SJosef Bacik if (ret) { 726c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 727c7e54b51SJosef Bacik goto fail; 728c7e54b51SJosef Bacik } 72952c26179SYan Zheng 7306025c19fSLu Fengqi ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid, 7314a0cc7caSNikolay Borisov btrfs_ino(BTRFS_I(dir)), index, name, namelen); 732c7e54b51SJosef Bacik if (ret) { 733c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 734c7e54b51SJosef Bacik goto fail; 735c7e54b51SJosef Bacik } 7360660b5afSChris Mason 737cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7386bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 739dd5f9615SStefan Behrens if (ret) 74066642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 741dd5f9615SStefan Behrens 742f46b5a66SChristoph Hellwig fail: 74349a3c4d9SDavid Sterba kfree(root_item); 744d5c12070SMiao Xie trans->block_rsv = NULL; 745d5c12070SMiao Xie trans->bytes_reserved = 0; 746e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 747de6e8200SLiu Bo 7483a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 749f46b5a66SChristoph Hellwig if (err && !ret) 750f46b5a66SChristoph Hellwig ret = err; 7511a65e24bSChris Mason 7525662344bSTsutomu Itoh if (!ret) { 7535662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 754de6e8200SLiu Bo if (IS_ERR(inode)) 755de6e8200SLiu Bo return PTR_ERR(inode); 7565662344bSTsutomu Itoh d_instantiate(dentry, inode); 7575662344bSTsutomu Itoh } 758f46b5a66SChristoph Hellwig return ret; 75949a3c4d9SDavid Sterba 76049a3c4d9SDavid Sterba fail_free: 7612dfb1e43SQu Wenruo if (anon_dev) 7622dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 76349a3c4d9SDavid Sterba kfree(root_item); 76449a3c4d9SDavid Sterba return ret; 765f46b5a66SChristoph Hellwig } 766f46b5a66SChristoph Hellwig 767e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7689babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 769e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 770f46b5a66SChristoph Hellwig { 7710b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7722e4bfab9SYan, Zheng struct inode *inode; 773f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 774f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7752e4bfab9SYan, Zheng int ret; 776f46b5a66SChristoph Hellwig 77792a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 778f46b5a66SChristoph Hellwig return -EINVAL; 779f46b5a66SChristoph Hellwig 780eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 781eede2bf3SOmar Sandoval btrfs_warn(fs_info, 782eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 783eede2bf3SOmar Sandoval return -ETXTBSY; 784eede2bf3SOmar Sandoval } 785eede2bf3SOmar Sandoval 78623269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 787a1ee7362SDavid Sterba if (!pending_snapshot) 788a1ee7362SDavid Sterba return -ENOMEM; 789a1ee7362SDavid Sterba 7902dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 7912dfb1e43SQu Wenruo if (ret < 0) 7922dfb1e43SQu Wenruo goto free_pending; 793b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 79423269bf5SDavid Sterba GFP_KERNEL); 7958546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 7968546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 797b0c0ea63SDavid Sterba ret = -ENOMEM; 798b0c0ea63SDavid Sterba goto free_pending; 799b0c0ea63SDavid Sterba } 800b0c0ea63SDavid Sterba 80166d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 80266d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 803d5c12070SMiao Xie /* 804d5c12070SMiao Xie * 1 - parent dir inode 805d5c12070SMiao Xie * 2 - dir entries 806d5c12070SMiao Xie * 1 - root item 807d5c12070SMiao Xie * 2 - root ref/backref 808d5c12070SMiao Xie * 1 - root of snapshot 809dd5f9615SStefan Behrens * 1 - UUID item 810d5c12070SMiao Xie */ 811d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 812dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 813ee3441b4SJeff Mahoney false); 814d5c12070SMiao Xie if (ret) 815c11fbb6eSRobbie Ko goto free_pending; 816d5c12070SMiao Xie 817a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 818a22285a6SYan, Zheng pending_snapshot->root = root; 819b83cc969SLi Zefan pending_snapshot->readonly = readonly; 820e9662f70SMiao Xie pending_snapshot->dir = dir; 8218696c533SMiao Xie pending_snapshot->inherit = inherit; 822a22285a6SYan, Zheng 823d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 824a22285a6SYan, Zheng if (IS_ERR(trans)) { 825a22285a6SYan, Zheng ret = PTR_ERR(trans); 826a22285a6SYan, Zheng goto fail; 827a22285a6SYan, Zheng } 828a22285a6SYan, Zheng 8290b246afaSJeff Mahoney spin_lock(&fs_info->trans_lock); 830a22285a6SYan, Zheng list_add(&pending_snapshot->list, 831a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 8320b246afaSJeff Mahoney spin_unlock(&fs_info->trans_lock); 8339babda9fSNikolay Borisov 8343a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 835aec8030aSMiao Xie if (ret) 836c37b2b62SJosef Bacik goto fail; 837a22285a6SYan, Zheng 838a22285a6SYan, Zheng ret = pending_snapshot->error; 839f46b5a66SChristoph Hellwig if (ret) 8402e4bfab9SYan, Zheng goto fail; 841f46b5a66SChristoph Hellwig 842d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 843d3797308SChris Mason if (ret) 844d3797308SChris Mason goto fail; 845d3797308SChris Mason 8462b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8472e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8482e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8492e4bfab9SYan, Zheng goto fail; 8502e4bfab9SYan, Zheng } 8515662344bSTsutomu Itoh 8522e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8532e4bfab9SYan, Zheng ret = 0; 8542dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8552e4bfab9SYan, Zheng fail: 8562dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 8572dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8582dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 85900246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 860e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 861b0c0ea63SDavid Sterba free_pending: 8622dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8632dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 864b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8658546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 866a1ee7362SDavid Sterba kfree(pending_snapshot); 867a1ee7362SDavid Sterba 868f46b5a66SChristoph Hellwig return ret; 869f46b5a66SChristoph Hellwig } 870f46b5a66SChristoph Hellwig 8714260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8724260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8734260f7c7SSage Weil * whether the type of victim is right. 8744260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8754260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8764260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8774260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8784260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8794260f7c7SSage Weil * a. be owner of dir, or 8804260f7c7SSage Weil * b. be owner of victim, or 8814260f7c7SSage Weil * c. have CAP_FOWNER capability 88201327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 8834260f7c7SSage Weil * links pointing to it. 8844260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8854260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 8864260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 8874260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 8884260f7c7SSage Weil * nfs_async_unlink(). 8894260f7c7SSage Weil */ 8904260f7c7SSage Weil 8914260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 8924260f7c7SSage Weil { 8934260f7c7SSage Weil int error; 8944260f7c7SSage Weil 8952b0143b5SDavid Howells if (d_really_is_negative(victim)) 8964260f7c7SSage Weil return -ENOENT; 8974260f7c7SSage Weil 8982b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 8994fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 9004260f7c7SSage Weil 9014260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 9024260f7c7SSage Weil if (error) 9034260f7c7SSage Weil return error; 9044260f7c7SSage Weil if (IS_APPEND(dir)) 9054260f7c7SSage Weil return -EPERM; 9062b0143b5SDavid Howells if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) || 9072b0143b5SDavid Howells IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim))) 9084260f7c7SSage Weil return -EPERM; 9094260f7c7SSage Weil if (isdir) { 910e36cb0b8SDavid Howells if (!d_is_dir(victim)) 9114260f7c7SSage Weil return -ENOTDIR; 9124260f7c7SSage Weil if (IS_ROOT(victim)) 9134260f7c7SSage Weil return -EBUSY; 914e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 9154260f7c7SSage Weil return -EISDIR; 9164260f7c7SSage Weil if (IS_DEADDIR(dir)) 9174260f7c7SSage Weil return -ENOENT; 9184260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 9194260f7c7SSage Weil return -EBUSY; 9204260f7c7SSage Weil return 0; 9214260f7c7SSage Weil } 9224260f7c7SSage Weil 923cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 924cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 925cb8e7090SChristoph Hellwig { 9262b0143b5SDavid Howells if (d_really_is_positive(child)) 927cb8e7090SChristoph Hellwig return -EEXIST; 928cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 929cb8e7090SChristoph Hellwig return -ENOENT; 930cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 931cb8e7090SChristoph Hellwig } 932cb8e7090SChristoph Hellwig 933cb8e7090SChristoph Hellwig /* 934cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 935cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 936cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 937cb8e7090SChristoph Hellwig */ 93892872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 93952f75f4fSDavid Sterba const char *name, int namelen, 94072fd032eSSage Weil struct btrfs_root *snap_src, 9419babda9fSNikolay Borisov bool readonly, 9428696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 943cb8e7090SChristoph Hellwig { 9442b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9450b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 946cb8e7090SChristoph Hellwig struct dentry *dentry; 947cb8e7090SChristoph Hellwig int error; 948cb8e7090SChristoph Hellwig 94900235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 95000235411SAl Viro if (error == -EINTR) 95100235411SAl Viro return error; 952cb8e7090SChristoph Hellwig 953cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 954cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 955cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 956cb8e7090SChristoph Hellwig goto out_unlock; 957cb8e7090SChristoph Hellwig 95876dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 959cb8e7090SChristoph Hellwig if (error) 960a874a63eSLiu Bo goto out_dput; 961cb8e7090SChristoph Hellwig 9629c52057cSChris Mason /* 9639c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9649c52057cSChris Mason * check for them now when we can safely fail 9659c52057cSChris Mason */ 9669c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 9679c52057cSChris Mason dir->i_ino, name, 9689c52057cSChris Mason namelen); 9699c52057cSChris Mason if (error) 9709c52057cSChris Mason goto out_dput; 9719c52057cSChris Mason 9720b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 97376dda93cSYan, Zheng 97476dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 97576dda93cSYan, Zheng goto out_up_read; 97676dda93cSYan, Zheng 9779babda9fSNikolay Borisov if (snap_src) 9789babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 9799babda9fSNikolay Borisov else 9809babda9fSNikolay Borisov error = create_subvol(dir, dentry, name, namelen, inherit); 9819babda9fSNikolay Borisov 98276dda93cSYan, Zheng if (!error) 98376dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 98476dda93cSYan, Zheng out_up_read: 9850b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 986cb8e7090SChristoph Hellwig out_dput: 987cb8e7090SChristoph Hellwig dput(dentry); 988cb8e7090SChristoph Hellwig out_unlock: 9895955102cSAl Viro inode_unlock(dir); 990cb8e7090SChristoph Hellwig return error; 991cb8e7090SChristoph Hellwig } 992cb8e7090SChristoph Hellwig 993c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 994c11fbb6eSRobbie Ko const char *name, int namelen, 995c11fbb6eSRobbie Ko struct btrfs_root *root, 996c11fbb6eSRobbie Ko bool readonly, 997c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 998c11fbb6eSRobbie Ko { 999c11fbb6eSRobbie Ko int ret; 1000c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 1001c11fbb6eSRobbie Ko 1002c11fbb6eSRobbie Ko /* 1003c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 1004c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 1005c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 1006c11fbb6eSRobbie Ko */ 1007c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 1008c11fbb6eSRobbie Ko 1009c11fbb6eSRobbie Ko ret = btrfs_start_delalloc_snapshot(root); 1010c11fbb6eSRobbie Ko if (ret) 1011c11fbb6eSRobbie Ko goto out; 1012c11fbb6eSRobbie Ko 1013c11fbb6eSRobbie Ko /* 1014c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 1015c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 1016c11fbb6eSRobbie Ko * creation. 1017c11fbb6eSRobbie Ko */ 1018c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 1019c11fbb6eSRobbie Ko snapshot_force_cow = true; 1020c11fbb6eSRobbie Ko 1021c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 1022c11fbb6eSRobbie Ko 1023c11fbb6eSRobbie Ko ret = btrfs_mksubvol(parent, name, namelen, 1024c11fbb6eSRobbie Ko root, readonly, inherit); 1025c11fbb6eSRobbie Ko out: 1026c11fbb6eSRobbie Ko if (snapshot_force_cow) 1027c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 1028c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 1029c11fbb6eSRobbie Ko return ret; 1030c11fbb6eSRobbie Ko } 1031c11fbb6eSRobbie Ko 10324cb5300bSChris Mason /* 10334cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 10344cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 10354cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 10364cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 10374cb5300bSChris Mason * part of the file 10384cb5300bSChris Mason */ 1039aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 10404cb5300bSChris Mason { 10414cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 10424cb5300bSChris Mason struct extent_map *em = NULL; 10434cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 10444cb5300bSChris Mason u64 end; 10454cb5300bSChris Mason 10464cb5300bSChris Mason read_lock(&em_tree->lock); 104709cbfeafSKirill A. Shutemov em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE); 10484cb5300bSChris Mason read_unlock(&em_tree->lock); 10494cb5300bSChris Mason 10504cb5300bSChris Mason if (em) { 10514cb5300bSChris Mason end = extent_map_end(em); 10524cb5300bSChris Mason free_extent_map(em); 10534cb5300bSChris Mason if (end - offset > thresh) 10544cb5300bSChris Mason return 0; 10554cb5300bSChris Mason } 10564cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 10574cb5300bSChris Mason thresh /= 2; 10584cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 10594cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 10604cb5300bSChris Mason if (end >= thresh) 10614cb5300bSChris Mason return 0; 10624cb5300bSChris Mason return 1; 10634cb5300bSChris Mason } 10644cb5300bSChris Mason 10654cb5300bSChris Mason /* 10664cb5300bSChris Mason * helper function to walk through a file and find extents 10674cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 10684cb5300bSChris Mason * 10694cb5300bSChris Mason * This is used by the defragging code to find new and small 10704cb5300bSChris Mason * extents 10714cb5300bSChris Mason */ 10724cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 10734cb5300bSChris Mason struct inode *inode, u64 newer_than, 1074aab110abSDavid Sterba u64 *off, u32 thresh) 10754cb5300bSChris Mason { 10764cb5300bSChris Mason struct btrfs_path *path; 10774cb5300bSChris Mason struct btrfs_key min_key; 10784cb5300bSChris Mason struct extent_buffer *leaf; 10794cb5300bSChris Mason struct btrfs_file_extent_item *extent; 10804cb5300bSChris Mason int type; 10814cb5300bSChris Mason int ret; 10824a0cc7caSNikolay Borisov u64 ino = btrfs_ino(BTRFS_I(inode)); 10834cb5300bSChris Mason 10844cb5300bSChris Mason path = btrfs_alloc_path(); 10854cb5300bSChris Mason if (!path) 10864cb5300bSChris Mason return -ENOMEM; 10874cb5300bSChris Mason 1088a4689d2bSDavid Sterba min_key.objectid = ino; 10894cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 10904cb5300bSChris Mason min_key.offset = *off; 10914cb5300bSChris Mason 10924cb5300bSChris Mason while (1) { 10936174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 10944cb5300bSChris Mason if (ret != 0) 10954cb5300bSChris Mason goto none; 1096f094c9bdSFilipe Manana process_slot: 1097a4689d2bSDavid Sterba if (min_key.objectid != ino) 10984cb5300bSChris Mason goto none; 10994cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 11004cb5300bSChris Mason goto none; 11014cb5300bSChris Mason 11024cb5300bSChris Mason leaf = path->nodes[0]; 11034cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 11044cb5300bSChris Mason struct btrfs_file_extent_item); 11054cb5300bSChris Mason 11064cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 11074cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 11084cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 11094cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 11104cb5300bSChris Mason *off = min_key.offset; 11114cb5300bSChris Mason btrfs_free_path(path); 11124cb5300bSChris Mason return 0; 11134cb5300bSChris Mason } 11144cb5300bSChris Mason 1115f094c9bdSFilipe Manana path->slots[0]++; 1116f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 1117f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 1118f094c9bdSFilipe Manana goto process_slot; 1119f094c9bdSFilipe Manana } 1120f094c9bdSFilipe Manana 11214cb5300bSChris Mason if (min_key.offset == (u64)-1) 11224cb5300bSChris Mason goto none; 11234cb5300bSChris Mason 11244cb5300bSChris Mason min_key.offset++; 11254cb5300bSChris Mason btrfs_release_path(path); 11264cb5300bSChris Mason } 11274cb5300bSChris Mason none: 11284cb5300bSChris Mason btrfs_free_path(path); 11294cb5300bSChris Mason return -ENOENT; 11304cb5300bSChris Mason } 11314cb5300bSChris Mason 11326c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 113317ce6ef8SLiu Bo { 113417ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1135940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 11366c282eb4SLi Zefan struct extent_map *em; 113709cbfeafSKirill A. Shutemov u64 len = PAGE_SIZE; 1138940100a4SChris Mason 1139940100a4SChris Mason /* 1140940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1141940100a4SChris Mason * the full extent lock 1142940100a4SChris Mason */ 1143940100a4SChris Mason read_lock(&em_tree->lock); 1144940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 1145940100a4SChris Mason read_unlock(&em_tree->lock); 1146940100a4SChris Mason 1147940100a4SChris Mason if (!em) { 1148308d9800SFilipe Manana struct extent_state *cached = NULL; 1149308d9800SFilipe Manana u64 end = start + len - 1; 1150308d9800SFilipe Manana 1151940100a4SChris Mason /* get the big lock and read metadata off disk */ 1152ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 115339b07b5dSOmar Sandoval em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len); 1154e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1155940100a4SChris Mason 11566cf8bfbfSDan Carpenter if (IS_ERR(em)) 11576c282eb4SLi Zefan return NULL; 1158940100a4SChris Mason } 1159940100a4SChris Mason 11606c282eb4SLi Zefan return em; 11616c282eb4SLi Zefan } 11626c282eb4SLi Zefan 11636c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 11646c282eb4SLi Zefan { 11656c282eb4SLi Zefan struct extent_map *next; 11666c282eb4SLi Zefan bool ret = true; 11676c282eb4SLi Zefan 11686c282eb4SLi Zefan /* this is the last extent */ 11696c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 11706c282eb4SLi Zefan return false; 11716c282eb4SLi Zefan 11726c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1173e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1174e9512d72SChris Mason ret = false; 1175e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1176ee22184bSByongho Lee (em->block_len > SZ_128K && next->block_len > SZ_128K)) 11776c282eb4SLi Zefan ret = false; 11786c282eb4SLi Zefan 11796c282eb4SLi Zefan free_extent_map(next); 11806c282eb4SLi Zefan return ret; 11816c282eb4SLi Zefan } 11826c282eb4SLi Zefan 1183aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1184a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1185a43a2111SAndrew Mahone int compress) 11866c282eb4SLi Zefan { 11876c282eb4SLi Zefan struct extent_map *em; 11886c282eb4SLi Zefan int ret = 1; 11896c282eb4SLi Zefan bool next_mergeable = true; 11904a3560c4SLiu Bo bool prev_mergeable = true; 11916c282eb4SLi Zefan 11926c282eb4SLi Zefan /* 11936c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 11946c282eb4SLi Zefan * defragging it 11956c282eb4SLi Zefan */ 11966c282eb4SLi Zefan if (start < *defrag_end) 11976c282eb4SLi Zefan return 1; 11986c282eb4SLi Zefan 11996c282eb4SLi Zefan *skip = 0; 12006c282eb4SLi Zefan 12016c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 12026c282eb4SLi Zefan if (!em) 12036c282eb4SLi Zefan return 0; 12046c282eb4SLi Zefan 1205940100a4SChris Mason /* this will cover holes, and inline extents */ 120617ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1207940100a4SChris Mason ret = 0; 120817ce6ef8SLiu Bo goto out; 120917ce6ef8SLiu Bo } 121017ce6ef8SLiu Bo 12114a3560c4SLiu Bo if (!*defrag_end) 12124a3560c4SLiu Bo prev_mergeable = false; 12134a3560c4SLiu Bo 12146c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1215940100a4SChris Mason /* 12166c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 12176c282eb4SLi Zefan * real extent, don't bother defragging it 1218940100a4SChris Mason */ 1219a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 12204a3560c4SLiu Bo (em->len >= thresh || (!next_mergeable && !prev_mergeable))) 1221940100a4SChris Mason ret = 0; 122217ce6ef8SLiu Bo out: 1223940100a4SChris Mason /* 1224940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1225940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1226940100a4SChris Mason * so that the next tiny extent will force a defrag. 1227940100a4SChris Mason * 1228940100a4SChris Mason * The end result of this is that tiny extents before a single big 1229940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1230940100a4SChris Mason */ 1231940100a4SChris Mason if (ret) { 1232940100a4SChris Mason *defrag_end = extent_map_end(em); 1233940100a4SChris Mason } else { 1234940100a4SChris Mason *last_len = 0; 1235940100a4SChris Mason *skip = extent_map_end(em); 1236940100a4SChris Mason *defrag_end = 0; 1237940100a4SChris Mason } 1238940100a4SChris Mason 1239940100a4SChris Mason free_extent_map(em); 1240940100a4SChris Mason return ret; 1241940100a4SChris Mason } 1242940100a4SChris Mason 12434cb5300bSChris Mason /* 12444cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 12454cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 12464cb5300bSChris Mason * to COW and defrag. 12474cb5300bSChris Mason * 12484cb5300bSChris Mason * It also makes sure the delalloc code has enough 12494cb5300bSChris Mason * dirty data to avoid making new small extents as part 12504cb5300bSChris Mason * of the defrag 12514cb5300bSChris Mason * 12524cb5300bSChris Mason * It's a good idea to start RA on this range 12534cb5300bSChris Mason * before calling this. 12544cb5300bSChris Mason */ 12554cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 12564cb5300bSChris Mason struct page **pages, 12574cb5300bSChris Mason unsigned long start_index, 1258c41570c9SJustin Maggard unsigned long num_pages) 1259f46b5a66SChristoph Hellwig { 12604cb5300bSChris Mason unsigned long file_end; 12614cb5300bSChris Mason u64 isize = i_size_read(inode); 1262f46b5a66SChristoph Hellwig u64 page_start; 1263f46b5a66SChristoph Hellwig u64 page_end; 12641f12bd06SLiu Bo u64 page_cnt; 12654cb5300bSChris Mason int ret; 12664cb5300bSChris Mason int i; 12674cb5300bSChris Mason int i_done; 12684cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 12694cb5300bSChris Mason struct extent_state *cached_state = NULL; 1270600a45e1SMiao Xie struct extent_io_tree *tree; 1271364ecf36SQu Wenruo struct extent_changeset *data_reserved = NULL; 12723b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 12734cb5300bSChris Mason 127409cbfeafSKirill A. Shutemov file_end = (isize - 1) >> PAGE_SHIFT; 12751f12bd06SLiu Bo if (!isize || start_index > file_end) 12761f12bd06SLiu Bo return 0; 12771f12bd06SLiu Bo 12781f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 12794cb5300bSChris Mason 1280e5b7231eSNikolay Borisov ret = btrfs_delalloc_reserve_space(BTRFS_I(inode), &data_reserved, 128109cbfeafSKirill A. Shutemov start_index << PAGE_SHIFT, 128209cbfeafSKirill A. Shutemov page_cnt << PAGE_SHIFT); 12834cb5300bSChris Mason if (ret) 12844cb5300bSChris Mason return ret; 12854cb5300bSChris Mason i_done = 0; 1286600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 12874cb5300bSChris Mason 12884cb5300bSChris Mason /* step one, lock all the pages */ 12891f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 12904cb5300bSChris Mason struct page *page; 1291600a45e1SMiao Xie again: 1292a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 12933b16a4e3SJosef Bacik start_index + i, mask); 12944cb5300bSChris Mason if (!page) 12954cb5300bSChris Mason break; 12964cb5300bSChris Mason 1297600a45e1SMiao Xie page_start = page_offset(page); 129809cbfeafSKirill A. Shutemov page_end = page_start + PAGE_SIZE - 1; 1299600a45e1SMiao Xie while (1) { 1300308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1301ff13db41SDavid Sterba &cached_state); 1302c3504372SNikolay Borisov ordered = btrfs_lookup_ordered_extent(BTRFS_I(inode), 1303600a45e1SMiao Xie page_start); 1304308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1305e43bbe5eSDavid Sterba &cached_state); 1306600a45e1SMiao Xie if (!ordered) 1307600a45e1SMiao Xie break; 1308600a45e1SMiao Xie 1309600a45e1SMiao Xie unlock_page(page); 1310600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1311600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1312600a45e1SMiao Xie lock_page(page); 13131f12bd06SLiu Bo /* 13141f12bd06SLiu Bo * we unlocked the page above, so we need check if 13151f12bd06SLiu Bo * it was released or not. 13161f12bd06SLiu Bo */ 13171f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 13181f12bd06SLiu Bo unlock_page(page); 131909cbfeafSKirill A. Shutemov put_page(page); 13201f12bd06SLiu Bo goto again; 13211f12bd06SLiu Bo } 1322600a45e1SMiao Xie } 1323600a45e1SMiao Xie 13244cb5300bSChris Mason if (!PageUptodate(page)) { 13254cb5300bSChris Mason btrfs_readpage(NULL, page); 13264cb5300bSChris Mason lock_page(page); 13274cb5300bSChris Mason if (!PageUptodate(page)) { 13284cb5300bSChris Mason unlock_page(page); 132909cbfeafSKirill A. Shutemov put_page(page); 13304cb5300bSChris Mason ret = -EIO; 13314cb5300bSChris Mason break; 13324cb5300bSChris Mason } 13334cb5300bSChris Mason } 1334600a45e1SMiao Xie 1335600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1336600a45e1SMiao Xie unlock_page(page); 133709cbfeafSKirill A. Shutemov put_page(page); 1338600a45e1SMiao Xie goto again; 1339600a45e1SMiao Xie } 1340600a45e1SMiao Xie 13414cb5300bSChris Mason pages[i] = page; 13424cb5300bSChris Mason i_done++; 13434cb5300bSChris Mason } 13444cb5300bSChris Mason if (!i_done || ret) 13454cb5300bSChris Mason goto out; 13464cb5300bSChris Mason 13471751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 13484cb5300bSChris Mason goto out; 13494cb5300bSChris Mason 13504cb5300bSChris Mason /* 13514cb5300bSChris Mason * so now we have a nice long stream of locked 13524cb5300bSChris Mason * and up to date pages, lets wait on them 13534cb5300bSChris Mason */ 13544cb5300bSChris Mason for (i = 0; i < i_done; i++) 13554cb5300bSChris Mason wait_on_page_writeback(pages[i]); 13564cb5300bSChris Mason 13574cb5300bSChris Mason page_start = page_offset(pages[0]); 135809cbfeafSKirill A. Shutemov page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE; 13594cb5300bSChris Mason 13604cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1361ff13db41SDavid Sterba page_start, page_end - 1, &cached_state); 13624cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 1363e182163dSOmar Sandoval page_end - 1, EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 1364e182163dSOmar Sandoval EXTENT_DEFRAG, 0, 0, &cached_state); 13654cb5300bSChris Mason 13661f12bd06SLiu Bo if (i_done != page_cnt) { 13679e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 136828c4a3e2SSu Yue btrfs_mod_outstanding_extents(BTRFS_I(inode), 1); 13699e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 137086d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 137109cbfeafSKirill A. Shutemov start_index << PAGE_SHIFT, 137243b18595SQu Wenruo (page_cnt - i_done) << PAGE_SHIFT, true); 13734cb5300bSChris Mason } 13744cb5300bSChris Mason 13754cb5300bSChris Mason 13769e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 1377018ed4f7SDavid Sterba &cached_state); 13784cb5300bSChris Mason 13794cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 1380e43bbe5eSDavid Sterba page_start, page_end - 1, &cached_state); 13814cb5300bSChris Mason 13824cb5300bSChris Mason for (i = 0; i < i_done; i++) { 13834cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 13844cb5300bSChris Mason ClearPageChecked(pages[i]); 13854cb5300bSChris Mason set_page_extent_mapped(pages[i]); 13864cb5300bSChris Mason set_page_dirty(pages[i]); 13874cb5300bSChris Mason unlock_page(pages[i]); 138809cbfeafSKirill A. Shutemov put_page(pages[i]); 13894cb5300bSChris Mason } 13908702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1391364ecf36SQu Wenruo extent_changeset_free(data_reserved); 13924cb5300bSChris Mason return i_done; 13934cb5300bSChris Mason out: 13944cb5300bSChris Mason for (i = 0; i < i_done; i++) { 13954cb5300bSChris Mason unlock_page(pages[i]); 139609cbfeafSKirill A. Shutemov put_page(pages[i]); 13974cb5300bSChris Mason } 139886d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 139909cbfeafSKirill A. Shutemov start_index << PAGE_SHIFT, 140043b18595SQu Wenruo page_cnt << PAGE_SHIFT, true); 14018702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1402364ecf36SQu Wenruo extent_changeset_free(data_reserved); 14034cb5300bSChris Mason return ret; 14044cb5300bSChris Mason 14054cb5300bSChris Mason } 14064cb5300bSChris Mason 14074cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 14084cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 14094cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 14104cb5300bSChris Mason { 14110b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 14124cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 14134cb5300bSChris Mason struct file_ra_state *ra = NULL; 14144cb5300bSChris Mason unsigned long last_index; 1415151a31b2SLi Zefan u64 isize = i_size_read(inode); 1416940100a4SChris Mason u64 last_len = 0; 1417940100a4SChris Mason u64 skip = 0; 1418940100a4SChris Mason u64 defrag_end = 0; 14194cb5300bSChris Mason u64 newer_off = range->start; 1420f46b5a66SChristoph Hellwig unsigned long i; 1421008873eaSLi Zefan unsigned long ra_index = 0; 1422f46b5a66SChristoph Hellwig int ret; 14234cb5300bSChris Mason int defrag_count = 0; 14241a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1425aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 142609cbfeafSKirill A. Shutemov unsigned long max_cluster = SZ_256K >> PAGE_SHIFT; 1427c41570c9SJustin Maggard unsigned long cluster = max_cluster; 1428ee22184bSByongho Lee u64 new_align = ~((u64)SZ_128K - 1); 14294cb5300bSChris Mason struct page **pages = NULL; 14301e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 14314cb5300bSChris Mason 14320abd5b17SLiu Bo if (isize == 0) 14330abd5b17SLiu Bo return 0; 14340abd5b17SLiu Bo 14350abd5b17SLiu Bo if (range->start >= isize) 14360abd5b17SLiu Bo return -EINVAL; 14371a419d85SLi Zefan 14381e2ef46dSDavid Sterba if (do_compress) { 1439ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 14401a419d85SLi Zefan return -EINVAL; 14411a419d85SLi Zefan if (range->compress_type) 14421a419d85SLi Zefan compress_type = range->compress_type; 14431a419d85SLi Zefan } 1444f46b5a66SChristoph Hellwig 14450abd5b17SLiu Bo if (extent_thresh == 0) 1446ee22184bSByongho Lee extent_thresh = SZ_256K; 1447f46b5a66SChristoph Hellwig 14484cb5300bSChris Mason /* 14490a52d108SDavid Sterba * If we were not given a file, allocate a readahead context. As 14500a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 14510a52d108SDavid Sterba * we don't error out. 14524cb5300bSChris Mason */ 14534cb5300bSChris Mason if (!file) { 145463e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 14550a52d108SDavid Sterba if (ra) 14564cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 14574cb5300bSChris Mason } else { 14584cb5300bSChris Mason ra = &file->f_ra; 14594cb5300bSChris Mason } 14604cb5300bSChris Mason 146163e727ecSDavid Sterba pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL); 14624cb5300bSChris Mason if (!pages) { 14634cb5300bSChris Mason ret = -ENOMEM; 14644cb5300bSChris Mason goto out_ra; 14654cb5300bSChris Mason } 14664cb5300bSChris Mason 14674cb5300bSChris Mason /* find the last page to defrag */ 14681e701a32SChris Mason if (range->start + range->len > range->start) { 1469151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 147009cbfeafSKirill A. Shutemov range->start + range->len - 1) >> PAGE_SHIFT; 14711e701a32SChris Mason } else { 147209cbfeafSKirill A. Shutemov last_index = (isize - 1) >> PAGE_SHIFT; 14731e701a32SChris Mason } 14741e701a32SChris Mason 14754cb5300bSChris Mason if (newer_than) { 14764cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 1477ee22184bSByongho Lee &newer_off, SZ_64K); 14784cb5300bSChris Mason if (!ret) { 14794cb5300bSChris Mason range->start = newer_off; 14804cb5300bSChris Mason /* 14814cb5300bSChris Mason * we always align our defrag to help keep 14824cb5300bSChris Mason * the extents in the file evenly spaced 14834cb5300bSChris Mason */ 148409cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 14854cb5300bSChris Mason } else 14864cb5300bSChris Mason goto out_ra; 14874cb5300bSChris Mason } else { 148809cbfeafSKirill A. Shutemov i = range->start >> PAGE_SHIFT; 14894cb5300bSChris Mason } 14904cb5300bSChris Mason if (!max_to_defrag) 1491070034bdSchandan max_to_defrag = last_index - i + 1; 14924cb5300bSChris Mason 14932a0f7f57SLi Zefan /* 14942a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 14952a0f7f57SLi Zefan * written sequentially. 14962a0f7f57SLi Zefan */ 14972a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 14982a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 14992a0f7f57SLi Zefan 1500f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 150109cbfeafSKirill A. Shutemov (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) { 15024cb5300bSChris Mason /* 15034cb5300bSChris Mason * make sure we stop running if someone unmounts 15044cb5300bSChris Mason * the FS 15054cb5300bSChris Mason */ 15061751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 15074cb5300bSChris Mason break; 15084cb5300bSChris Mason 15090b246afaSJeff Mahoney if (btrfs_defrag_cancelled(fs_info)) { 15100b246afaSJeff Mahoney btrfs_debug(fs_info, "defrag_file cancelled"); 1511210549ebSDavid Sterba ret = -EAGAIN; 1512210549ebSDavid Sterba break; 1513210549ebSDavid Sterba } 1514210549ebSDavid Sterba 151509cbfeafSKirill A. Shutemov if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT, 15166c282eb4SLi Zefan extent_thresh, &last_len, &skip, 15171e2ef46dSDavid Sterba &defrag_end, do_compress)){ 1518940100a4SChris Mason unsigned long next; 1519940100a4SChris Mason /* 1520940100a4SChris Mason * the should_defrag function tells us how much to skip 1521940100a4SChris Mason * bump our counter by the suggested amount 1522940100a4SChris Mason */ 152309cbfeafSKirill A. Shutemov next = DIV_ROUND_UP(skip, PAGE_SIZE); 1524940100a4SChris Mason i = max(i + 1, next); 1525940100a4SChris Mason continue; 1526940100a4SChris Mason } 1527008873eaSLi Zefan 1528008873eaSLi Zefan if (!newer_than) { 152909cbfeafSKirill A. Shutemov cluster = (PAGE_ALIGN(defrag_end) >> 153009cbfeafSKirill A. Shutemov PAGE_SHIFT) - i; 1531008873eaSLi Zefan cluster = min(cluster, max_cluster); 1532008873eaSLi Zefan } else { 1533008873eaSLi Zefan cluster = max_cluster; 1534008873eaSLi Zefan } 1535008873eaSLi Zefan 1536008873eaSLi Zefan if (i + cluster > ra_index) { 1537008873eaSLi Zefan ra_index = max(i, ra_index); 15380a52d108SDavid Sterba if (ra) 1539d3c0bab5SDavid Sterba page_cache_sync_readahead(inode->i_mapping, ra, 1540d3c0bab5SDavid Sterba file, ra_index, cluster); 1541e4826a5bSchandan ra_index += cluster; 1542008873eaSLi Zefan } 15434cb5300bSChris Mason 15445955102cSAl Viro inode_lock(inode); 1545eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1546eede2bf3SOmar Sandoval ret = -ETXTBSY; 1547eede2bf3SOmar Sandoval } else { 15481e2ef46dSDavid Sterba if (do_compress) 1549eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 1550008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1551eede2bf3SOmar Sandoval } 1552ecb8bea8SLiu Bo if (ret < 0) { 15535955102cSAl Viro inode_unlock(inode); 15544cb5300bSChris Mason goto out_ra; 1555ecb8bea8SLiu Bo } 15564cb5300bSChris Mason 15574cb5300bSChris Mason defrag_count += ret; 1558d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 15595955102cSAl Viro inode_unlock(inode); 15604cb5300bSChris Mason 15614cb5300bSChris Mason if (newer_than) { 15624cb5300bSChris Mason if (newer_off == (u64)-1) 15634cb5300bSChris Mason break; 15644cb5300bSChris Mason 1565e1f041e1SLiu Bo if (ret > 0) 1566e1f041e1SLiu Bo i += ret; 1567e1f041e1SLiu Bo 15684cb5300bSChris Mason newer_off = max(newer_off + 1, 156909cbfeafSKirill A. Shutemov (u64)i << PAGE_SHIFT); 15704cb5300bSChris Mason 1571ee22184bSByongho Lee ret = find_new_extents(root, inode, newer_than, 1572ee22184bSByongho Lee &newer_off, SZ_64K); 15734cb5300bSChris Mason if (!ret) { 15744cb5300bSChris Mason range->start = newer_off; 157509cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 15764cb5300bSChris Mason } else { 15774cb5300bSChris Mason break; 1578940100a4SChris Mason } 15794cb5300bSChris Mason } else { 1580008873eaSLi Zefan if (ret > 0) { 1581cbcc8326SLi Zefan i += ret; 158209cbfeafSKirill A. Shutemov last_len += ret << PAGE_SHIFT; 1583008873eaSLi Zefan } else { 1584940100a4SChris Mason i++; 1585008873eaSLi Zefan last_len = 0; 1586008873eaSLi Zefan } 1587f46b5a66SChristoph Hellwig } 15884cb5300bSChris Mason } 1589f46b5a66SChristoph Hellwig 1590dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 15911e701a32SChris Mason filemap_flush(inode->i_mapping); 1592dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1593dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1594dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1595dec8ef90SFilipe Manana } 15961e701a32SChris Mason 15971a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 15980b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 15995c1aab1dSNick Terrell } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) { 16005c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 16011a419d85SLi Zefan } 16021a419d85SLi Zefan 160360ccf82fSDiego Calleja ret = defrag_count; 1604940100a4SChris Mason 16054cb5300bSChris Mason out_ra: 16061e2ef46dSDavid Sterba if (do_compress) { 16075955102cSAl Viro inode_lock(inode); 1608eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 16095955102cSAl Viro inode_unlock(inode); 1610633085c7SFilipe David Borba Manana } 16114cb5300bSChris Mason if (!file) 16124cb5300bSChris Mason kfree(ra); 16134cb5300bSChris Mason kfree(pages); 1614940100a4SChris Mason return ret; 1615f46b5a66SChristoph Hellwig } 1616f46b5a66SChristoph Hellwig 1617198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 161876dda93cSYan, Zheng void __user *arg) 1619f46b5a66SChristoph Hellwig { 16200b246afaSJeff Mahoney struct inode *inode = file_inode(file); 16210b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1622f46b5a66SChristoph Hellwig u64 new_size; 1623f46b5a66SChristoph Hellwig u64 old_size; 1624f46b5a66SChristoph Hellwig u64 devid = 1; 16250b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1626f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1627f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1628f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1629f46b5a66SChristoph Hellwig char *sizestr; 16309a40f122SGui Hecheng char *retptr; 1631f46b5a66SChristoph Hellwig char *devstr = NULL; 1632f46b5a66SChristoph Hellwig int ret = 0; 1633f46b5a66SChristoph Hellwig int mod = 0; 1634f46b5a66SChristoph Hellwig 1635e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1636e441d54dSChris Mason return -EPERM; 1637e441d54dSChris Mason 1638198605a8SMiao Xie ret = mnt_want_write_file(file); 1639198605a8SMiao Xie if (ret) 1640198605a8SMiao Xie return ret; 1641198605a8SMiao Xie 1642171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 164397547676SMiao Xie mnt_drop_write_file(file); 1644e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1645c9e9f97bSIlya Dryomov } 1646c9e9f97bSIlya Dryomov 1647dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1648c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1649c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1650c9e9f97bSIlya Dryomov goto out; 1651c9e9f97bSIlya Dryomov } 16525516e595SMark Fasheh 16535516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1654f46b5a66SChristoph Hellwig 1655f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1656f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1657f46b5a66SChristoph Hellwig if (devstr) { 1658f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1659f46b5a66SChristoph Hellwig *devstr = '\0'; 1660f46b5a66SChristoph Hellwig devstr = vol_args->name; 166158dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 166258dfae63SZhangZhen if (ret) 166358dfae63SZhangZhen goto out_free; 1664dfd79829SMiao Xie if (!devid) { 1665dfd79829SMiao Xie ret = -EINVAL; 1666dfd79829SMiao Xie goto out_free; 1667dfd79829SMiao Xie } 16680b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1669f46b5a66SChristoph Hellwig } 1670dba60f3fSMiao Xie 167109ba3bc9SAnand Jain device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL, true); 1672f46b5a66SChristoph Hellwig if (!device) { 16730b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1674c1c9ff7cSGeert Uytterhoeven devid); 1675dfd79829SMiao Xie ret = -ENODEV; 1676c9e9f97bSIlya Dryomov goto out_free; 1677f46b5a66SChristoph Hellwig } 1678dba60f3fSMiao Xie 1679ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 16800b246afaSJeff Mahoney btrfs_info(fs_info, 1681efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1682c1c9ff7cSGeert Uytterhoeven devid); 1683dfd79829SMiao Xie ret = -EPERM; 16844e42ae1bSLiu Bo goto out_free; 16854e42ae1bSLiu Bo } 16864e42ae1bSLiu Bo 1687f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1688f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1689f46b5a66SChristoph Hellwig else { 1690f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1691f46b5a66SChristoph Hellwig mod = -1; 1692f46b5a66SChristoph Hellwig sizestr++; 1693f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1694f46b5a66SChristoph Hellwig mod = 1; 1695f46b5a66SChristoph Hellwig sizestr++; 1696f46b5a66SChristoph Hellwig } 16979a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 16989a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1699f46b5a66SChristoph Hellwig ret = -EINVAL; 1700c9e9f97bSIlya Dryomov goto out_free; 1701f46b5a66SChristoph Hellwig } 1702f46b5a66SChristoph Hellwig } 1703f46b5a66SChristoph Hellwig 1704401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1705dfd79829SMiao Xie ret = -EPERM; 170663a212abSStefan Behrens goto out_free; 170763a212abSStefan Behrens } 170863a212abSStefan Behrens 17097cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1710f46b5a66SChristoph Hellwig 1711f46b5a66SChristoph Hellwig if (mod < 0) { 1712f46b5a66SChristoph Hellwig if (new_size > old_size) { 1713f46b5a66SChristoph Hellwig ret = -EINVAL; 1714c9e9f97bSIlya Dryomov goto out_free; 1715f46b5a66SChristoph Hellwig } 1716f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1717f46b5a66SChristoph Hellwig } else if (mod > 0) { 1718eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1719902c68a4SGui Hecheng ret = -ERANGE; 1720eb8052e0SWenliang Fan goto out_free; 1721eb8052e0SWenliang Fan } 1722f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1723f46b5a66SChristoph Hellwig } 1724f46b5a66SChristoph Hellwig 1725ee22184bSByongho Lee if (new_size < SZ_256M) { 1726f46b5a66SChristoph Hellwig ret = -EINVAL; 1727c9e9f97bSIlya Dryomov goto out_free; 1728f46b5a66SChristoph Hellwig } 1729f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1730f46b5a66SChristoph Hellwig ret = -EFBIG; 1731c9e9f97bSIlya Dryomov goto out_free; 1732f46b5a66SChristoph Hellwig } 1733f46b5a66SChristoph Hellwig 173447f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1735f46b5a66SChristoph Hellwig 1736f46b5a66SChristoph Hellwig if (new_size > old_size) { 1737a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 173898d5dc13STsutomu Itoh if (IS_ERR(trans)) { 173998d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1740c9e9f97bSIlya Dryomov goto out_free; 174198d5dc13STsutomu Itoh } 1742f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 17433a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1744ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1745f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 17460253f40eSjeff.liu } /* equal, nothing need to do */ 1747f46b5a66SChristoph Hellwig 1748faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1749faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1750faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1751faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 1752faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1753c9e9f97bSIlya Dryomov out_free: 1754f46b5a66SChristoph Hellwig kfree(vol_args); 1755c9e9f97bSIlya Dryomov out: 1756171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 175718f39c41SIlya Dryomov mnt_drop_write_file(file); 1758f46b5a66SChristoph Hellwig return ret; 1759f46b5a66SChristoph Hellwig } 1760f46b5a66SChristoph Hellwig 17615d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 176252f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 17635d54c67eSNikolay Borisov bool readonly, 17648696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1765f46b5a66SChristoph Hellwig { 1766f46b5a66SChristoph Hellwig int namelen; 17673de4586cSChris Mason int ret = 0; 1768f46b5a66SChristoph Hellwig 1769325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1770325c50e3SJeff Mahoney return -ENOTDIR; 1771325c50e3SJeff Mahoney 1772a874a63eSLiu Bo ret = mnt_want_write_file(file); 1773a874a63eSLiu Bo if (ret) 1774a874a63eSLiu Bo goto out; 1775a874a63eSLiu Bo 177672fd032eSSage Weil namelen = strlen(name); 177772fd032eSSage Weil if (strchr(name, '/')) { 1778f46b5a66SChristoph Hellwig ret = -EINVAL; 1779a874a63eSLiu Bo goto out_drop_write; 1780f46b5a66SChristoph Hellwig } 1781f46b5a66SChristoph Hellwig 178216780cabSChris Mason if (name[0] == '.' && 178316780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 178416780cabSChris Mason ret = -EEXIST; 1785a874a63eSLiu Bo goto out_drop_write; 178616780cabSChris Mason } 178716780cabSChris Mason 17883de4586cSChris Mason if (subvol) { 178972fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 17905d54c67eSNikolay Borisov NULL, readonly, inherit); 1791cb8e7090SChristoph Hellwig } else { 17922903ff01SAl Viro struct fd src = fdget(fd); 17933de4586cSChris Mason struct inode *src_inode; 17942903ff01SAl Viro if (!src.file) { 17953de4586cSChris Mason ret = -EINVAL; 1796a874a63eSLiu Bo goto out_drop_write; 17973de4586cSChris Mason } 17983de4586cSChris Mason 1799496ad9aaSAl Viro src_inode = file_inode(src.file); 1800496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1801c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1802efe120a0SFrank Holton "Snapshot src from another FS"); 180323ad5b17SKusanagi Kouichi ret = -EXDEV; 1804d0242061SDavid Sterba } else if (!inode_owner_or_capable(src_inode)) { 1805d0242061SDavid Sterba /* 1806d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1807d0242061SDavid Sterba * are limited to own subvolumes only 1808d0242061SDavid Sterba */ 1809d0242061SDavid Sterba ret = -EPERM; 1810ecd18815SAl Viro } else { 1811c11fbb6eSRobbie Ko ret = btrfs_mksnapshot(&file->f_path, name, namelen, 181272fd032eSSage Weil BTRFS_I(src_inode)->root, 18135d54c67eSNikolay Borisov readonly, inherit); 1814ecd18815SAl Viro } 18152903ff01SAl Viro fdput(src); 1816cb8e7090SChristoph Hellwig } 1817a874a63eSLiu Bo out_drop_write: 1818a874a63eSLiu Bo mnt_drop_write_file(file); 1819f46b5a66SChristoph Hellwig out: 182072fd032eSSage Weil return ret; 182172fd032eSSage Weil } 182272fd032eSSage Weil 182372fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1824fa0d2b9bSLi Zefan void __user *arg, int subvol) 182572fd032eSSage Weil { 1826fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 182772fd032eSSage Weil int ret; 182872fd032eSSage Weil 1829325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1830325c50e3SJeff Mahoney return -ENOTDIR; 1831325c50e3SJeff Mahoney 1832fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1833fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1834fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1835fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1836fa0d2b9bSLi Zefan 18375d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 18385d54c67eSNikolay Borisov subvol, false, NULL); 1839fa0d2b9bSLi Zefan 1840fa0d2b9bSLi Zefan kfree(vol_args); 1841fa0d2b9bSLi Zefan return ret; 1842fa0d2b9bSLi Zefan } 1843fa0d2b9bSLi Zefan 1844fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1845fa0d2b9bSLi Zefan void __user *arg, int subvol) 1846fa0d2b9bSLi Zefan { 1847fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1848fa0d2b9bSLi Zefan int ret; 1849b83cc969SLi Zefan bool readonly = false; 18506f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 185172fd032eSSage Weil 1852325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1853325c50e3SJeff Mahoney return -ENOTDIR; 1854325c50e3SJeff Mahoney 1855fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1856fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1857fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1858fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1859fdfb1e4fSLi Zefan 1860673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 1861b83cc969SLi Zefan ret = -EOPNOTSUPP; 1862c47ca32dSDan Carpenter goto free_args; 1863fdfb1e4fSLi Zefan } 1864fdfb1e4fSLi Zefan 1865b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1866b83cc969SLi Zefan readonly = true; 18676f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 186809cbfeafSKirill A. Shutemov if (vol_args->size > PAGE_SIZE) { 18696f72c7e2SArne Jansen ret = -EINVAL; 1870c47ca32dSDan Carpenter goto free_args; 18716f72c7e2SArne Jansen } 18726f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 18736f72c7e2SArne Jansen if (IS_ERR(inherit)) { 18746f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1875c47ca32dSDan Carpenter goto free_args; 18766f72c7e2SArne Jansen } 18776f72c7e2SArne Jansen } 187875eaa0e2SSage Weil 18795d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 18805d54c67eSNikolay Borisov subvol, readonly, inherit); 1881c47ca32dSDan Carpenter if (ret) 1882c47ca32dSDan Carpenter goto free_inherit; 1883c47ca32dSDan Carpenter free_inherit: 18846f72c7e2SArne Jansen kfree(inherit); 1885c47ca32dSDan Carpenter free_args: 1886c47ca32dSDan Carpenter kfree(vol_args); 1887f46b5a66SChristoph Hellwig return ret; 1888f46b5a66SChristoph Hellwig } 1889f46b5a66SChristoph Hellwig 18900caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 18910caa102dSLi Zefan void __user *arg) 18920caa102dSLi Zefan { 1893496ad9aaSAl Viro struct inode *inode = file_inode(file); 18940b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 18950caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 18960caa102dSLi Zefan int ret = 0; 18970caa102dSLi Zefan u64 flags = 0; 18980caa102dSLi Zefan 18994a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 19000caa102dSLi Zefan return -EINVAL; 19010caa102dSLi Zefan 19020b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 19030caa102dSLi Zefan if (btrfs_root_readonly(root)) 19040caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 19050b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 19060caa102dSLi Zefan 19070caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 19080caa102dSLi Zefan ret = -EFAULT; 19090caa102dSLi Zefan 19100caa102dSLi Zefan return ret; 19110caa102dSLi Zefan } 19120caa102dSLi Zefan 19130caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 19140caa102dSLi Zefan void __user *arg) 19150caa102dSLi Zefan { 1916496ad9aaSAl Viro struct inode *inode = file_inode(file); 19170b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 19180caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 19190caa102dSLi Zefan struct btrfs_trans_handle *trans; 19200caa102dSLi Zefan u64 root_flags; 19210caa102dSLi Zefan u64 flags; 19220caa102dSLi Zefan int ret = 0; 19230caa102dSLi Zefan 1924bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 1925bd60ea0fSDavid Sterba return -EPERM; 1926bd60ea0fSDavid Sterba 1927b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1928b9ca0664SLiu Bo if (ret) 1929b9ca0664SLiu Bo goto out; 19300caa102dSLi Zefan 19314a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 1932b9ca0664SLiu Bo ret = -EINVAL; 1933b9ca0664SLiu Bo goto out_drop_write; 1934b9ca0664SLiu Bo } 19350caa102dSLi Zefan 1936b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1937b9ca0664SLiu Bo ret = -EFAULT; 1938b9ca0664SLiu Bo goto out_drop_write; 1939b9ca0664SLiu Bo } 19400caa102dSLi Zefan 1941b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1942b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1943b9ca0664SLiu Bo goto out_drop_write; 1944b9ca0664SLiu Bo } 19450caa102dSLi Zefan 19460b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 19470caa102dSLi Zefan 19480caa102dSLi Zefan /* nothing to do */ 19490caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1950b9ca0664SLiu Bo goto out_drop_sem; 19510caa102dSLi Zefan 19520caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 19532c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 19540caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 19550caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 19562c686537SDavid Sterba } else { 19572c686537SDavid Sterba /* 19582c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 19592c686537SDavid Sterba * send 19602c686537SDavid Sterba */ 19612c686537SDavid Sterba spin_lock(&root->root_item_lock); 19622c686537SDavid Sterba if (root->send_in_progress == 0) { 19630caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 19640caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 19652c686537SDavid Sterba spin_unlock(&root->root_item_lock); 19662c686537SDavid Sterba } else { 19672c686537SDavid Sterba spin_unlock(&root->root_item_lock); 19680b246afaSJeff Mahoney btrfs_warn(fs_info, 19692c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 19702c686537SDavid Sterba root->root_key.objectid); 19712c686537SDavid Sterba ret = -EPERM; 19722c686537SDavid Sterba goto out_drop_sem; 19732c686537SDavid Sterba } 19742c686537SDavid Sterba } 19750caa102dSLi Zefan 19760caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 19770caa102dSLi Zefan if (IS_ERR(trans)) { 19780caa102dSLi Zefan ret = PTR_ERR(trans); 19790caa102dSLi Zefan goto out_reset; 19800caa102dSLi Zefan } 19810caa102dSLi Zefan 19820b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 19830caa102dSLi Zefan &root->root_key, &root->root_item); 19849417ebc8SNikolay Borisov if (ret < 0) { 19859417ebc8SNikolay Borisov btrfs_end_transaction(trans); 19869417ebc8SNikolay Borisov goto out_reset; 19879417ebc8SNikolay Borisov } 19880caa102dSLi Zefan 19899417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 19909417ebc8SNikolay Borisov 19910caa102dSLi Zefan out_reset: 19920caa102dSLi Zefan if (ret) 19930caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1994b9ca0664SLiu Bo out_drop_sem: 19950b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 1996b9ca0664SLiu Bo out_drop_write: 1997b9ca0664SLiu Bo mnt_drop_write_file(file); 1998b9ca0664SLiu Bo out: 19990caa102dSLi Zefan return ret; 20000caa102dSLi Zefan } 20010caa102dSLi Zefan 2002ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 2003ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 2004ac8e9819SChris Mason { 2005abc6e134SChris Mason struct btrfs_key test; 2006abc6e134SChris Mason int ret; 2007abc6e134SChris Mason 2008abc6e134SChris Mason test.objectid = sk->min_objectid; 2009abc6e134SChris Mason test.type = sk->min_type; 2010abc6e134SChris Mason test.offset = sk->min_offset; 2011abc6e134SChris Mason 2012abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2013abc6e134SChris Mason if (ret < 0) 2014ac8e9819SChris Mason return 0; 2015abc6e134SChris Mason 2016abc6e134SChris Mason test.objectid = sk->max_objectid; 2017abc6e134SChris Mason test.type = sk->max_type; 2018abc6e134SChris Mason test.offset = sk->max_offset; 2019abc6e134SChris Mason 2020abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2021abc6e134SChris Mason if (ret > 0) 2022ac8e9819SChris Mason return 0; 2023ac8e9819SChris Mason return 1; 2024ac8e9819SChris Mason } 2025ac8e9819SChris Mason 2026df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2027ac8e9819SChris Mason struct btrfs_key *key, 2028ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 20299b6e817dSGerhard Heift size_t *buf_size, 2030ba346b35SGerhard Heift char __user *ubuf, 2031ac8e9819SChris Mason unsigned long *sk_offset, 2032ac8e9819SChris Mason int *num_found) 2033ac8e9819SChris Mason { 2034ac8e9819SChris Mason u64 found_transid; 2035ac8e9819SChris Mason struct extent_buffer *leaf; 2036ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2037dd81d459SNaohiro Aota struct btrfs_key test; 2038ac8e9819SChris Mason unsigned long item_off; 2039ac8e9819SChris Mason unsigned long item_len; 2040ac8e9819SChris Mason int nritems; 2041ac8e9819SChris Mason int i; 2042ac8e9819SChris Mason int slot; 2043ac8e9819SChris Mason int ret = 0; 2044ac8e9819SChris Mason 2045ac8e9819SChris Mason leaf = path->nodes[0]; 2046ac8e9819SChris Mason slot = path->slots[0]; 2047ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2048ac8e9819SChris Mason 2049ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2050ac8e9819SChris Mason i = nritems; 2051ac8e9819SChris Mason goto advance_key; 2052ac8e9819SChris Mason } 2053ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2054ac8e9819SChris Mason 2055ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2056ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 2057ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 2058ac8e9819SChris Mason 205903b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 206003b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 206103b71c6cSGabriel de Perthuis continue; 206203b71c6cSGabriel de Perthuis 20639b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 20648f5f6178SGerhard Heift if (*num_found) { 2065ac8e9819SChris Mason ret = 1; 20668f5f6178SGerhard Heift goto out; 20678f5f6178SGerhard Heift } 20688f5f6178SGerhard Heift 20698f5f6178SGerhard Heift /* 20708f5f6178SGerhard Heift * return one empty item back for v1, which does not 20718f5f6178SGerhard Heift * handle -EOVERFLOW 20728f5f6178SGerhard Heift */ 20738f5f6178SGerhard Heift 20749b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2075ac8e9819SChris Mason item_len = 0; 20768f5f6178SGerhard Heift ret = -EOVERFLOW; 20778f5f6178SGerhard Heift } 2078ac8e9819SChris Mason 20799b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2080ac8e9819SChris Mason ret = 1; 208125c9bc2eSGerhard Heift goto out; 2082ac8e9819SChris Mason } 2083ac8e9819SChris Mason 2084ac8e9819SChris Mason sh.objectid = key->objectid; 2085ac8e9819SChris Mason sh.offset = key->offset; 2086ac8e9819SChris Mason sh.type = key->type; 2087ac8e9819SChris Mason sh.len = item_len; 2088ac8e9819SChris Mason sh.transid = found_transid; 2089ac8e9819SChris Mason 2090a48b73ecSJosef Bacik /* 2091a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 2092a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 2093a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 2094a48b73ecSJosef Bacik * properly this next time through 2095a48b73ecSJosef Bacik */ 2096a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 2097a48b73ecSJosef Bacik ret = 0; 2098ba346b35SGerhard Heift goto out; 2099ba346b35SGerhard Heift } 2100ba346b35SGerhard Heift 2101ac8e9819SChris Mason *sk_offset += sizeof(sh); 2102ac8e9819SChris Mason 2103ac8e9819SChris Mason if (item_len) { 2104ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2105a48b73ecSJosef Bacik /* 2106a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 2107a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 2108a48b73ecSJosef Bacik */ 2109a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 2110ba346b35SGerhard Heift item_off, item_len)) { 2111a48b73ecSJosef Bacik ret = 0; 2112a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 2113ba346b35SGerhard Heift goto out; 2114ba346b35SGerhard Heift } 2115ba346b35SGerhard Heift 2116ac8e9819SChris Mason *sk_offset += item_len; 2117ac8e9819SChris Mason } 2118e2156867SHugo Mills (*num_found)++; 2119ac8e9819SChris Mason 21208f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 21218f5f6178SGerhard Heift goto out; 21228f5f6178SGerhard Heift 212325c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 212425c9bc2eSGerhard Heift ret = 1; 212525c9bc2eSGerhard Heift goto out; 212625c9bc2eSGerhard Heift } 2127ac8e9819SChris Mason } 2128ac8e9819SChris Mason advance_key: 2129ac8e9819SChris Mason ret = 0; 2130dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2131dd81d459SNaohiro Aota test.type = sk->max_type; 2132dd81d459SNaohiro Aota test.offset = sk->max_offset; 2133dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2134dd81d459SNaohiro Aota ret = 1; 2135dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2136abc6e134SChris Mason key->offset++; 2137dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2138abc6e134SChris Mason key->offset = 0; 2139abc6e134SChris Mason key->type++; 2140dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2141abc6e134SChris Mason key->offset = 0; 2142abc6e134SChris Mason key->type = 0; 2143abc6e134SChris Mason key->objectid++; 2144abc6e134SChris Mason } else 2145abc6e134SChris Mason ret = 1; 214625c9bc2eSGerhard Heift out: 2147ba346b35SGerhard Heift /* 2148ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2149ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2150ba346b35SGerhard Heift * * all items were found 2151ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2152ba346b35SGerhard Heift * leaf 2153ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2154ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2155ba346b35SGerhard Heift */ 2156ac8e9819SChris Mason return ret; 2157ac8e9819SChris Mason } 2158ac8e9819SChris Mason 2159ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 216012544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 21619b6e817dSGerhard Heift size_t *buf_size, 2162ba346b35SGerhard Heift char __user *ubuf) 2163ac8e9819SChris Mason { 21640b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2165ac8e9819SChris Mason struct btrfs_root *root; 2166ac8e9819SChris Mason struct btrfs_key key; 2167ac8e9819SChris Mason struct btrfs_path *path; 2168ac8e9819SChris Mason int ret; 2169ac8e9819SChris Mason int num_found = 0; 2170ac8e9819SChris Mason unsigned long sk_offset = 0; 2171ac8e9819SChris Mason 21729b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 21739b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 217412544442SGerhard Heift return -EOVERFLOW; 21759b6e817dSGerhard Heift } 217612544442SGerhard Heift 2177ac8e9819SChris Mason path = btrfs_alloc_path(); 2178ac8e9819SChris Mason if (!path) 2179ac8e9819SChris Mason return -ENOMEM; 2180ac8e9819SChris Mason 2181ac8e9819SChris Mason if (sk->tree_id == 0) { 2182ac8e9819SChris Mason /* search the root of the inode that was passed */ 218300246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2184ac8e9819SChris Mason } else { 218556e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2186ac8e9819SChris Mason if (IS_ERR(root)) { 2187ac8e9819SChris Mason btrfs_free_path(path); 2188ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2189ac8e9819SChris Mason } 2190ac8e9819SChris Mason } 2191ac8e9819SChris Mason 2192ac8e9819SChris Mason key.objectid = sk->min_objectid; 2193ac8e9819SChris Mason key.type = sk->min_type; 2194ac8e9819SChris Mason key.offset = sk->min_offset; 2195ac8e9819SChris Mason 2196ac8e9819SChris Mason while (1) { 21971c78544eSFilipe Manana ret = fault_in_pages_writeable(ubuf + sk_offset, 21981c78544eSFilipe Manana *buf_size - sk_offset); 2199a48b73ecSJosef Bacik if (ret) 2200a48b73ecSJosef Bacik break; 2201a48b73ecSJosef Bacik 22026174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2203ac8e9819SChris Mason if (ret != 0) { 2204ac8e9819SChris Mason if (ret > 0) 2205ac8e9819SChris Mason ret = 0; 2206ac8e9819SChris Mason goto err; 2207ac8e9819SChris Mason } 2208df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2209ac8e9819SChris Mason &sk_offset, &num_found); 2210b3b4aa74SDavid Sterba btrfs_release_path(path); 221125c9bc2eSGerhard Heift if (ret) 2212ac8e9819SChris Mason break; 2213ac8e9819SChris Mason 2214ac8e9819SChris Mason } 22158f5f6178SGerhard Heift if (ret > 0) 2216ac8e9819SChris Mason ret = 0; 2217ac8e9819SChris Mason err: 2218ac8e9819SChris Mason sk->nr_items = num_found; 221900246528SJosef Bacik btrfs_put_root(root); 2220ac8e9819SChris Mason btrfs_free_path(path); 2221ac8e9819SChris Mason return ret; 2222ac8e9819SChris Mason } 2223ac8e9819SChris Mason 2224ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2225ac8e9819SChris Mason void __user *argp) 2226ac8e9819SChris Mason { 2227ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2228ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2229ac8e9819SChris Mason struct inode *inode; 2230ac8e9819SChris Mason int ret; 22319b6e817dSGerhard Heift size_t buf_size; 2232ac8e9819SChris Mason 2233ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2234ac8e9819SChris Mason return -EPERM; 2235ac8e9819SChris Mason 2236ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2237ac8e9819SChris Mason 2238ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2239ba346b35SGerhard Heift return -EFAULT; 2240ba346b35SGerhard Heift 2241ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2242ac8e9819SChris Mason 2243496ad9aaSAl Viro inode = file_inode(file); 2244ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 22458f5f6178SGerhard Heift 22468f5f6178SGerhard Heift /* 22478f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 22488f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 22498f5f6178SGerhard Heift */ 22508f5f6178SGerhard Heift if (ret == -EOVERFLOW) 22518f5f6178SGerhard Heift ret = 0; 22528f5f6178SGerhard Heift 2253ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2254ac8e9819SChris Mason ret = -EFAULT; 2255ac8e9819SChris Mason return ret; 2256ac8e9819SChris Mason } 2257ac8e9819SChris Mason 2258cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2259cc68a8a5SGerhard Heift void __user *argp) 2260cc68a8a5SGerhard Heift { 2261cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2262cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2263cc68a8a5SGerhard Heift struct inode *inode; 2264cc68a8a5SGerhard Heift int ret; 2265cc68a8a5SGerhard Heift size_t buf_size; 2266ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2267cc68a8a5SGerhard Heift 2268cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2269cc68a8a5SGerhard Heift return -EPERM; 2270cc68a8a5SGerhard Heift 2271cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2272cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2273cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2274cc68a8a5SGerhard Heift return -EFAULT; 2275cc68a8a5SGerhard Heift 2276cc68a8a5SGerhard Heift buf_size = args.buf_size; 2277cc68a8a5SGerhard Heift 2278cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2279cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2280cc68a8a5SGerhard Heift buf_size = buf_limit; 2281cc68a8a5SGerhard Heift 2282cc68a8a5SGerhard Heift inode = file_inode(file); 2283cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2284718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2285cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2286cc68a8a5SGerhard Heift ret = -EFAULT; 2287cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2288cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2289cc68a8a5SGerhard Heift ret = -EFAULT; 2290cc68a8a5SGerhard Heift 229176dda93cSYan, Zheng return ret; 229276dda93cSYan, Zheng } 229376dda93cSYan, Zheng 229498d377a0STARUISI Hiroaki /* 2295ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2296ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 229798d377a0STARUISI Hiroaki */ 229898d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 229998d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 230098d377a0STARUISI Hiroaki { 230198d377a0STARUISI Hiroaki struct btrfs_root *root; 230298d377a0STARUISI Hiroaki struct btrfs_key key; 2303ac8e9819SChris Mason char *ptr; 230498d377a0STARUISI Hiroaki int ret = -1; 230598d377a0STARUISI Hiroaki int slot; 230698d377a0STARUISI Hiroaki int len; 230798d377a0STARUISI Hiroaki int total_len = 0; 230898d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 230998d377a0STARUISI Hiroaki struct extent_buffer *l; 231098d377a0STARUISI Hiroaki struct btrfs_path *path; 231198d377a0STARUISI Hiroaki 231298d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 231398d377a0STARUISI Hiroaki name[0]='\0'; 231498d377a0STARUISI Hiroaki return 0; 231598d377a0STARUISI Hiroaki } 231698d377a0STARUISI Hiroaki 231798d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 231898d377a0STARUISI Hiroaki if (!path) 231998d377a0STARUISI Hiroaki return -ENOMEM; 232098d377a0STARUISI Hiroaki 2321c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 232298d377a0STARUISI Hiroaki 232356e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 232498d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2325ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 232688234012SJosef Bacik root = NULL; 232788234012SJosef Bacik goto out; 232888234012SJosef Bacik } 232998d377a0STARUISI Hiroaki 233098d377a0STARUISI Hiroaki key.objectid = dirid; 233198d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 23328ad6fcabSChris Mason key.offset = (u64)-1; 233398d377a0STARUISI Hiroaki 233498d377a0STARUISI Hiroaki while (1) { 233598d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 233698d377a0STARUISI Hiroaki if (ret < 0) 233798d377a0STARUISI Hiroaki goto out; 233818674c6cSFilipe David Borba Manana else if (ret > 0) { 233918674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 234018674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 234118674c6cSFilipe David Borba Manana if (ret < 0) 234218674c6cSFilipe David Borba Manana goto out; 234318674c6cSFilipe David Borba Manana else if (ret > 0) { 2344ac8e9819SChris Mason ret = -ENOENT; 234598d377a0STARUISI Hiroaki goto out; 2346ac8e9819SChris Mason } 234718674c6cSFilipe David Borba Manana } 234818674c6cSFilipe David Borba Manana 234918674c6cSFilipe David Borba Manana l = path->nodes[0]; 235018674c6cSFilipe David Borba Manana slot = path->slots[0]; 235118674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 235298d377a0STARUISI Hiroaki 235398d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 235498d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 235598d377a0STARUISI Hiroaki ptr -= len + 1; 235698d377a0STARUISI Hiroaki total_len += len + 1; 2357a696cf35SFilipe David Borba Manana if (ptr < name) { 2358a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 235998d377a0STARUISI Hiroaki goto out; 2360a696cf35SFilipe David Borba Manana } 236198d377a0STARUISI Hiroaki 236298d377a0STARUISI Hiroaki *(ptr + len) = '/'; 236398d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 236498d377a0STARUISI Hiroaki 236598d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 236698d377a0STARUISI Hiroaki break; 236798d377a0STARUISI Hiroaki 2368b3b4aa74SDavid Sterba btrfs_release_path(path); 236998d377a0STARUISI Hiroaki key.objectid = key.offset; 23708ad6fcabSChris Mason key.offset = (u64)-1; 237198d377a0STARUISI Hiroaki dirid = key.objectid; 237298d377a0STARUISI Hiroaki } 237377906a50SLi Zefan memmove(name, ptr, total_len); 237498d377a0STARUISI Hiroaki name[total_len] = '\0'; 237598d377a0STARUISI Hiroaki ret = 0; 237698d377a0STARUISI Hiroaki out: 237700246528SJosef Bacik btrfs_put_root(root); 237898d377a0STARUISI Hiroaki btrfs_free_path(path); 2379ac8e9819SChris Mason return ret; 2380ac8e9819SChris Mason } 2381ac8e9819SChris Mason 238223d0b79dSTomohiro Misono static int btrfs_search_path_in_tree_user(struct inode *inode, 238323d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 238423d0b79dSTomohiro Misono { 238523d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 238623d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 238723d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 238823d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 238923d0b79dSTomohiro Misono u64 dirid = args->dirid; 239023d0b79dSTomohiro Misono unsigned long item_off; 239123d0b79dSTomohiro Misono unsigned long item_len; 239223d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 239323d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2394b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 239523d0b79dSTomohiro Misono struct btrfs_path *path; 239623d0b79dSTomohiro Misono struct btrfs_key key, key2; 239723d0b79dSTomohiro Misono struct extent_buffer *leaf; 239823d0b79dSTomohiro Misono struct inode *temp_inode; 239923d0b79dSTomohiro Misono char *ptr; 240023d0b79dSTomohiro Misono int slot; 240123d0b79dSTomohiro Misono int len; 240223d0b79dSTomohiro Misono int total_len = 0; 240323d0b79dSTomohiro Misono int ret; 240423d0b79dSTomohiro Misono 240523d0b79dSTomohiro Misono path = btrfs_alloc_path(); 240623d0b79dSTomohiro Misono if (!path) 240723d0b79dSTomohiro Misono return -ENOMEM; 240823d0b79dSTomohiro Misono 240923d0b79dSTomohiro Misono /* 241023d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 241123d0b79dSTomohiro Misono * construct the path in from the bottom up. 241223d0b79dSTomohiro Misono */ 241323d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 241423d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 241523d0b79dSTomohiro Misono 241656e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 241723d0b79dSTomohiro Misono if (IS_ERR(root)) { 241823d0b79dSTomohiro Misono ret = PTR_ERR(root); 241923d0b79dSTomohiro Misono goto out; 242023d0b79dSTomohiro Misono } 242123d0b79dSTomohiro Misono 242223d0b79dSTomohiro Misono key.objectid = dirid; 242323d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 242423d0b79dSTomohiro Misono key.offset = (u64)-1; 242523d0b79dSTomohiro Misono while (1) { 242623d0b79dSTomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 242723d0b79dSTomohiro Misono if (ret < 0) { 2428b8a49ae1SJosef Bacik goto out_put; 242923d0b79dSTomohiro Misono } else if (ret > 0) { 243023d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 243123d0b79dSTomohiro Misono BTRFS_INODE_REF_KEY); 243223d0b79dSTomohiro Misono if (ret < 0) { 2433b8a49ae1SJosef Bacik goto out_put; 243423d0b79dSTomohiro Misono } else if (ret > 0) { 243523d0b79dSTomohiro Misono ret = -ENOENT; 2436b8a49ae1SJosef Bacik goto out_put; 243723d0b79dSTomohiro Misono } 243823d0b79dSTomohiro Misono } 243923d0b79dSTomohiro Misono 244023d0b79dSTomohiro Misono leaf = path->nodes[0]; 244123d0b79dSTomohiro Misono slot = path->slots[0]; 244223d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 244323d0b79dSTomohiro Misono 244423d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 244523d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 244623d0b79dSTomohiro Misono ptr -= len + 1; 244723d0b79dSTomohiro Misono total_len += len + 1; 244823d0b79dSTomohiro Misono if (ptr < args->path) { 244923d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2450b8a49ae1SJosef Bacik goto out_put; 245123d0b79dSTomohiro Misono } 245223d0b79dSTomohiro Misono 245323d0b79dSTomohiro Misono *(ptr + len) = '/'; 245423d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 245523d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 245623d0b79dSTomohiro Misono 245723d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 245823d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 245923d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 246023d0b79dSTomohiro Misono if (ret < 0) { 2461b8a49ae1SJosef Bacik goto out_put; 246223d0b79dSTomohiro Misono } else if (ret > 0) { 246323d0b79dSTomohiro Misono ret = -ENOENT; 2464b8a49ae1SJosef Bacik goto out_put; 246523d0b79dSTomohiro Misono } 246623d0b79dSTomohiro Misono 246723d0b79dSTomohiro Misono leaf = path->nodes[0]; 246823d0b79dSTomohiro Misono slot = path->slots[0]; 246923d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 247023d0b79dSTomohiro Misono if (key2.objectid != dirid) { 247123d0b79dSTomohiro Misono ret = -ENOENT; 2472b8a49ae1SJosef Bacik goto out_put; 247323d0b79dSTomohiro Misono } 247423d0b79dSTomohiro Misono 24750202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 24763ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 24773ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2478b8a49ae1SJosef Bacik goto out_put; 24793ca57bd6SMisono Tomohiro } 248023d0b79dSTomohiro Misono ret = inode_permission(temp_inode, MAY_READ | MAY_EXEC); 248123d0b79dSTomohiro Misono iput(temp_inode); 248223d0b79dSTomohiro Misono if (ret) { 248323d0b79dSTomohiro Misono ret = -EACCES; 2484b8a49ae1SJosef Bacik goto out_put; 248523d0b79dSTomohiro Misono } 248623d0b79dSTomohiro Misono 248723d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 248823d0b79dSTomohiro Misono break; 248923d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 249023d0b79dSTomohiro Misono ret = -EACCES; 2491b8a49ae1SJosef Bacik goto out_put; 249223d0b79dSTomohiro Misono } 249323d0b79dSTomohiro Misono 249423d0b79dSTomohiro Misono btrfs_release_path(path); 249523d0b79dSTomohiro Misono key.objectid = key.offset; 249623d0b79dSTomohiro Misono key.offset = (u64)-1; 249723d0b79dSTomohiro Misono dirid = key.objectid; 249823d0b79dSTomohiro Misono } 249923d0b79dSTomohiro Misono 250023d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 250123d0b79dSTomohiro Misono args->path[total_len] = '\0'; 250200246528SJosef Bacik btrfs_put_root(root); 2503b8a49ae1SJosef Bacik root = NULL; 250423d0b79dSTomohiro Misono btrfs_release_path(path); 250523d0b79dSTomohiro Misono } 250623d0b79dSTomohiro Misono 250723d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 250823d0b79dSTomohiro Misono key.objectid = treeid; 250923d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 251023d0b79dSTomohiro Misono key.offset = args->treeid; 2511b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 251223d0b79dSTomohiro Misono if (ret < 0) { 251323d0b79dSTomohiro Misono goto out; 251423d0b79dSTomohiro Misono } else if (ret > 0) { 251523d0b79dSTomohiro Misono ret = -ENOENT; 251623d0b79dSTomohiro Misono goto out; 251723d0b79dSTomohiro Misono } 251823d0b79dSTomohiro Misono 251923d0b79dSTomohiro Misono leaf = path->nodes[0]; 252023d0b79dSTomohiro Misono slot = path->slots[0]; 252123d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 252223d0b79dSTomohiro Misono 252323d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 252423d0b79dSTomohiro Misono item_len = btrfs_item_size_nr(leaf, slot); 252523d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 252623d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 252723d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 252823d0b79dSTomohiro Misono ret = -EINVAL; 252923d0b79dSTomohiro Misono goto out; 253023d0b79dSTomohiro Misono } 253123d0b79dSTomohiro Misono 253223d0b79dSTomohiro Misono /* Copy subvolume's name */ 253323d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 253423d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 253523d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 253623d0b79dSTomohiro Misono args->name[item_len] = 0; 253723d0b79dSTomohiro Misono 2538b8a49ae1SJosef Bacik out_put: 253900246528SJosef Bacik btrfs_put_root(root); 254023d0b79dSTomohiro Misono out: 254123d0b79dSTomohiro Misono btrfs_free_path(path); 254223d0b79dSTomohiro Misono return ret; 254323d0b79dSTomohiro Misono } 254423d0b79dSTomohiro Misono 2545ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2546ac8e9819SChris Mason void __user *argp) 2547ac8e9819SChris Mason { 2548ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2549ac8e9819SChris Mason struct inode *inode; 255001b810b8SDavid Sterba int ret = 0; 2551ac8e9819SChris Mason 25522354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 25532354d08fSJulia Lawall if (IS_ERR(args)) 25542354d08fSJulia Lawall return PTR_ERR(args); 2555c2b96929SDan Carpenter 2556496ad9aaSAl Viro inode = file_inode(file); 2557ac8e9819SChris Mason 255801b810b8SDavid Sterba /* 255901b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 256001b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 256101b810b8SDavid Sterba */ 25621b53ac4dSChris Mason if (args->treeid == 0) 25631b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 25641b53ac4dSChris Mason 256501b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 256601b810b8SDavid Sterba args->name[0] = 0; 256701b810b8SDavid Sterba goto out; 256801b810b8SDavid Sterba } 256901b810b8SDavid Sterba 257001b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 257101b810b8SDavid Sterba ret = -EPERM; 257201b810b8SDavid Sterba goto out; 257301b810b8SDavid Sterba } 257401b810b8SDavid Sterba 2575ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2576ac8e9819SChris Mason args->treeid, args->objectid, 2577ac8e9819SChris Mason args->name); 2578ac8e9819SChris Mason 257901b810b8SDavid Sterba out: 2580ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2581ac8e9819SChris Mason ret = -EFAULT; 2582ac8e9819SChris Mason 2583ac8e9819SChris Mason kfree(args); 258498d377a0STARUISI Hiroaki return ret; 258598d377a0STARUISI Hiroaki } 258698d377a0STARUISI Hiroaki 258723d0b79dSTomohiro Misono /* 258823d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 258923d0b79dSTomohiro Misono * 259023d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 259123d0b79dSTomohiro Misono * 259223d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 259323d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 259423d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 259523d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 259623d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 259723d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 259823d0b79dSTomohiro Misono */ 259923d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 260023d0b79dSTomohiro Misono { 260123d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 260223d0b79dSTomohiro Misono struct inode *inode; 260323d0b79dSTomohiro Misono int ret; 260423d0b79dSTomohiro Misono 260523d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 260623d0b79dSTomohiro Misono if (IS_ERR(args)) 260723d0b79dSTomohiro Misono return PTR_ERR(args); 260823d0b79dSTomohiro Misono 260923d0b79dSTomohiro Misono inode = file_inode(file); 261023d0b79dSTomohiro Misono 261123d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 261223d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 261323d0b79dSTomohiro Misono /* 261423d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 261523d0b79dSTomohiro Misono * called 261623d0b79dSTomohiro Misono */ 261723d0b79dSTomohiro Misono kfree(args); 261823d0b79dSTomohiro Misono return -EACCES; 261923d0b79dSTomohiro Misono } 262023d0b79dSTomohiro Misono 262123d0b79dSTomohiro Misono ret = btrfs_search_path_in_tree_user(inode, args); 262223d0b79dSTomohiro Misono 262323d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 262423d0b79dSTomohiro Misono ret = -EFAULT; 262523d0b79dSTomohiro Misono 262623d0b79dSTomohiro Misono kfree(args); 262723d0b79dSTomohiro Misono return ret; 262823d0b79dSTomohiro Misono } 262923d0b79dSTomohiro Misono 2630b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 2631b64ec075STomohiro Misono static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) 2632b64ec075STomohiro Misono { 2633b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2634b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2635b64ec075STomohiro Misono struct btrfs_root *root; 2636b64ec075STomohiro Misono struct btrfs_path *path; 2637b64ec075STomohiro Misono struct btrfs_key key; 2638b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2639b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2640b64ec075STomohiro Misono struct extent_buffer *leaf; 2641b64ec075STomohiro Misono unsigned long item_off; 2642b64ec075STomohiro Misono unsigned long item_len; 2643b64ec075STomohiro Misono struct inode *inode; 2644b64ec075STomohiro Misono int slot; 2645b64ec075STomohiro Misono int ret = 0; 2646b64ec075STomohiro Misono 2647b64ec075STomohiro Misono path = btrfs_alloc_path(); 2648b64ec075STomohiro Misono if (!path) 2649b64ec075STomohiro Misono return -ENOMEM; 2650b64ec075STomohiro Misono 2651b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2652b64ec075STomohiro Misono if (!subvol_info) { 2653b64ec075STomohiro Misono btrfs_free_path(path); 2654b64ec075STomohiro Misono return -ENOMEM; 2655b64ec075STomohiro Misono } 2656b64ec075STomohiro Misono 2657b64ec075STomohiro Misono inode = file_inode(file); 2658b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2659b64ec075STomohiro Misono 2660b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2661b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 266256e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2663b64ec075STomohiro Misono if (IS_ERR(root)) { 2664b64ec075STomohiro Misono ret = PTR_ERR(root); 266504734e84SJosef Bacik goto out_free; 266604734e84SJosef Bacik } 2667b64ec075STomohiro Misono root_item = &root->root_item; 2668b64ec075STomohiro Misono 2669b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2670b64ec075STomohiro Misono 2671b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2672b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2673b64ec075STomohiro Misono 2674b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2675b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2676b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2677b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2678b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2679b64ec075STomohiro Misono 2680b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2681b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2682b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2683b64ec075STomohiro Misono 2684b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2685b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2686b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2687b64ec075STomohiro Misono 2688b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2689b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2690b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2691b64ec075STomohiro Misono 2692b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2693b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2694b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2695b64ec075STomohiro Misono 2696b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2697b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2698b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2699b64ec075STomohiro Misono key.offset = 0; 270004734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2701b64ec075STomohiro Misono if (ret < 0) { 2702b64ec075STomohiro Misono goto out; 2703b64ec075STomohiro Misono } else if (path->slots[0] >= 2704b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 270504734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2706b64ec075STomohiro Misono if (ret < 0) { 2707b64ec075STomohiro Misono goto out; 2708b64ec075STomohiro Misono } else if (ret > 0) { 2709b64ec075STomohiro Misono ret = -EUCLEAN; 2710b64ec075STomohiro Misono goto out; 2711b64ec075STomohiro Misono } 2712b64ec075STomohiro Misono } 2713b64ec075STomohiro Misono 2714b64ec075STomohiro Misono leaf = path->nodes[0]; 2715b64ec075STomohiro Misono slot = path->slots[0]; 2716b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2717b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2718b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2719b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2720b64ec075STomohiro Misono 2721b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2722b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2723b64ec075STomohiro Misono 2724b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2725b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 2726b64ec075STomohiro Misono item_len = btrfs_item_size_nr(leaf, slot) 2727b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2728b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2729b64ec075STomohiro Misono item_off, item_len); 2730b64ec075STomohiro Misono } else { 2731b64ec075STomohiro Misono ret = -ENOENT; 2732b64ec075STomohiro Misono goto out; 2733b64ec075STomohiro Misono } 2734b64ec075STomohiro Misono } 2735b64ec075STomohiro Misono 2736b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2737b64ec075STomohiro Misono ret = -EFAULT; 2738b64ec075STomohiro Misono 2739b64ec075STomohiro Misono out: 274000246528SJosef Bacik btrfs_put_root(root); 274104734e84SJosef Bacik out_free: 2742b64ec075STomohiro Misono btrfs_free_path(path); 2743b091f7feSWaiman Long kfree(subvol_info); 2744b64ec075STomohiro Misono return ret; 2745b64ec075STomohiro Misono } 2746b64ec075STomohiro Misono 274742e4b520STomohiro Misono /* 274842e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 274942e4b520STomohiro Misono * except the subvolume name. 275042e4b520STomohiro Misono */ 275142e4b520STomohiro Misono static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp) 275242e4b520STomohiro Misono { 275342e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 275442e4b520STomohiro Misono struct btrfs_root_ref *rref; 275542e4b520STomohiro Misono struct btrfs_root *root; 275642e4b520STomohiro Misono struct btrfs_path *path; 275742e4b520STomohiro Misono struct btrfs_key key; 275842e4b520STomohiro Misono struct extent_buffer *leaf; 275942e4b520STomohiro Misono struct inode *inode; 276042e4b520STomohiro Misono u64 objectid; 276142e4b520STomohiro Misono int slot; 276242e4b520STomohiro Misono int ret; 276342e4b520STomohiro Misono u8 found; 276442e4b520STomohiro Misono 276542e4b520STomohiro Misono path = btrfs_alloc_path(); 276642e4b520STomohiro Misono if (!path) 276742e4b520STomohiro Misono return -ENOMEM; 276842e4b520STomohiro Misono 276942e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 277042e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 277142e4b520STomohiro Misono btrfs_free_path(path); 277242e4b520STomohiro Misono return PTR_ERR(rootrefs); 277342e4b520STomohiro Misono } 277442e4b520STomohiro Misono 277542e4b520STomohiro Misono inode = file_inode(file); 277642e4b520STomohiro Misono root = BTRFS_I(inode)->root->fs_info->tree_root; 277742e4b520STomohiro Misono objectid = BTRFS_I(inode)->root->root_key.objectid; 277842e4b520STomohiro Misono 277942e4b520STomohiro Misono key.objectid = objectid; 278042e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 278142e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 278242e4b520STomohiro Misono found = 0; 278342e4b520STomohiro Misono 278442e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 278542e4b520STomohiro Misono if (ret < 0) { 278642e4b520STomohiro Misono goto out; 278742e4b520STomohiro Misono } else if (path->slots[0] >= 278842e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 278942e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 279042e4b520STomohiro Misono if (ret < 0) { 279142e4b520STomohiro Misono goto out; 279242e4b520STomohiro Misono } else if (ret > 0) { 279342e4b520STomohiro Misono ret = -EUCLEAN; 279442e4b520STomohiro Misono goto out; 279542e4b520STomohiro Misono } 279642e4b520STomohiro Misono } 279742e4b520STomohiro Misono while (1) { 279842e4b520STomohiro Misono leaf = path->nodes[0]; 279942e4b520STomohiro Misono slot = path->slots[0]; 280042e4b520STomohiro Misono 280142e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 280242e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 280342e4b520STomohiro Misono ret = 0; 280442e4b520STomohiro Misono goto out; 280542e4b520STomohiro Misono } 280642e4b520STomohiro Misono 280742e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 280842e4b520STomohiro Misono ret = -EOVERFLOW; 280942e4b520STomohiro Misono goto out; 281042e4b520STomohiro Misono } 281142e4b520STomohiro Misono 281242e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 281342e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 281442e4b520STomohiro Misono rootrefs->rootref[found].dirid = 281542e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 281642e4b520STomohiro Misono found++; 281742e4b520STomohiro Misono 281842e4b520STomohiro Misono ret = btrfs_next_item(root, path); 281942e4b520STomohiro Misono if (ret < 0) { 282042e4b520STomohiro Misono goto out; 282142e4b520STomohiro Misono } else if (ret > 0) { 282242e4b520STomohiro Misono ret = -EUCLEAN; 282342e4b520STomohiro Misono goto out; 282442e4b520STomohiro Misono } 282542e4b520STomohiro Misono } 282642e4b520STomohiro Misono 282742e4b520STomohiro Misono out: 282842e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 282942e4b520STomohiro Misono rootrefs->num_items = found; 283042e4b520STomohiro Misono /* update min_treeid for next search */ 283142e4b520STomohiro Misono if (found) 283242e4b520STomohiro Misono rootrefs->min_treeid = 283342e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 283442e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 283542e4b520STomohiro Misono ret = -EFAULT; 283642e4b520STomohiro Misono } 283742e4b520STomohiro Misono 283842e4b520STomohiro Misono kfree(rootrefs); 283942e4b520STomohiro Misono btrfs_free_path(path); 284042e4b520STomohiro Misono 284142e4b520STomohiro Misono return ret; 284242e4b520STomohiro Misono } 284342e4b520STomohiro Misono 284476dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2845949964c9SMarcos Paulo de Souza void __user *arg, 2846949964c9SMarcos Paulo de Souza bool destroy_v2) 284776dda93cSYan, Zheng { 284854563d41SAl Viro struct dentry *parent = file->f_path.dentry; 28490b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 285076dda93cSYan, Zheng struct dentry *dentry; 28512b0143b5SDavid Howells struct inode *dir = d_inode(parent); 285276dda93cSYan, Zheng struct inode *inode; 285376dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 285476dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2855949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2856949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 2857949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2858949964c9SMarcos Paulo de Souza int subvol_namelen; 285976dda93cSYan, Zheng int err = 0; 2860949964c9SMarcos Paulo de Souza bool destroy_parent = false; 286176dda93cSYan, Zheng 2862949964c9SMarcos Paulo de Souza if (destroy_v2) { 2863949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2864949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2865949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2866325c50e3SJeff Mahoney 2867949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2868949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2869949964c9SMarcos Paulo de Souza goto out; 2870949964c9SMarcos Paulo de Souza } 287176dda93cSYan, Zheng 2872949964c9SMarcos Paulo de Souza /* 2873949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2874949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2875949964c9SMarcos Paulo de Souza */ 2876949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2877949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2878949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2879949964c9SMarcos Paulo de Souza 2880949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2881949964c9SMarcos Paulo de Souza if (err) 2882949964c9SMarcos Paulo de Souza goto out; 2883949964c9SMarcos Paulo de Souza } else { 2884949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 288576dda93cSYan, Zheng err = -EINVAL; 288676dda93cSYan, Zheng goto out; 288776dda93cSYan, Zheng } 288876dda93cSYan, Zheng 2889a561be71SAl Viro err = mnt_want_write_file(file); 289076dda93cSYan, Zheng if (err) 289176dda93cSYan, Zheng goto out; 289276dda93cSYan, Zheng 2893949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 2894949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 2895949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 2896949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 2897949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 2898949964c9SMarcos Paulo de Souza goto out_drop_write; 2899949964c9SMarcos Paulo de Souza } 2900949964c9SMarcos Paulo de Souza 2901949964c9SMarcos Paulo de Souza /* 2902949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 2903949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 2904949964c9SMarcos Paulo de Souza */ 2905949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 2906949964c9SMarcos Paulo de Souza 2907949964c9SMarcos Paulo de Souza /* 2908949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 2909949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 2910949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 2911949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 2912949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 2913949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 2914949964c9SMarcos Paulo de Souza */ 2915949964c9SMarcos Paulo de Souza dput(dentry); 2916949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 2917949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 2918949964c9SMarcos Paulo de Souza goto out_drop_write; 2919949964c9SMarcos Paulo de Souza } 2920949964c9SMarcos Paulo de Souza dir = d_inode(parent); 2921949964c9SMarcos Paulo de Souza 2922949964c9SMarcos Paulo de Souza /* 2923949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 2924949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 2925949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 2926949964c9SMarcos Paulo de Souza * new parent dentry. 2927949964c9SMarcos Paulo de Souza */ 2928949964c9SMarcos Paulo de Souza destroy_parent = true; 2929949964c9SMarcos Paulo de Souza 2930949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 2931949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 2932949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 2933949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 2934949964c9SMarcos Paulo de Souza goto free_parent; 2935949964c9SMarcos Paulo de Souza } 2936949964c9SMarcos Paulo de Souza /* subvol_name_ptr is already NULL termined */ 2937949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 2938949964c9SMarcos Paulo de Souza } 2939949964c9SMarcos Paulo de Souza } else { 2940949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 2941949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 2942949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 2943949964c9SMarcos Paulo de Souza 2944949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 2945949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 2946949964c9SMarcos Paulo de Souza 2947949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2948949964c9SMarcos Paulo de Souza if (err) 2949949964c9SMarcos Paulo de Souza goto out; 2950949964c9SMarcos Paulo de Souza } 2951949964c9SMarcos Paulo de Souza 2952949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 2953949964c9SMarcos Paulo de Souza 2954949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 2955949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 2956949964c9SMarcos Paulo de Souza err = -EINVAL; 2957949964c9SMarcos Paulo de Souza goto free_subvol_name; 2958949964c9SMarcos Paulo de Souza } 2959949964c9SMarcos Paulo de Souza 2960949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 2961949964c9SMarcos Paulo de Souza err = -ENOTDIR; 2962949964c9SMarcos Paulo de Souza goto free_subvol_name; 2963949964c9SMarcos Paulo de Souza } 2964521e0546SDavid Sterba 296500235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 296600235411SAl Viro if (err == -EINTR) 2967949964c9SMarcos Paulo de Souza goto free_subvol_name; 2968949964c9SMarcos Paulo de Souza dentry = lookup_one_len(subvol_name, parent, subvol_namelen); 296976dda93cSYan, Zheng if (IS_ERR(dentry)) { 297076dda93cSYan, Zheng err = PTR_ERR(dentry); 297176dda93cSYan, Zheng goto out_unlock_dir; 297276dda93cSYan, Zheng } 297376dda93cSYan, Zheng 29742b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 297576dda93cSYan, Zheng err = -ENOENT; 297676dda93cSYan, Zheng goto out_dput; 297776dda93cSYan, Zheng } 297876dda93cSYan, Zheng 29792b0143b5SDavid Howells inode = d_inode(dentry); 29804260f7c7SSage Weil dest = BTRFS_I(inode)->root; 29814260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 29824260f7c7SSage Weil /* 29834260f7c7SSage Weil * Regular user. Only allow this with a special mount 29844260f7c7SSage Weil * option, when the user has write+exec access to the 29854260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 29864260f7c7SSage Weil * allowed. 29874260f7c7SSage Weil * 29884260f7c7SSage Weil * Note that this is _not_ check that the subvol is 29894260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 29904260f7c7SSage Weil * otherwise be able to delete. 29914260f7c7SSage Weil * 29924260f7c7SSage Weil * Users who want to delete empty subvols should try 29934260f7c7SSage Weil * rmdir(2). 29944260f7c7SSage Weil */ 29954260f7c7SSage Weil err = -EPERM; 29960b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 29974260f7c7SSage Weil goto out_dput; 29984260f7c7SSage Weil 29994260f7c7SSage Weil /* 30004260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 30014260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 30024260f7c7SSage Weil * must be called on the dentry referencing the root 30034260f7c7SSage Weil * of the subvol, not a random directory contained 30044260f7c7SSage Weil * within it. 30054260f7c7SSage Weil */ 30064260f7c7SSage Weil err = -EINVAL; 30074260f7c7SSage Weil if (root == dest) 30084260f7c7SSage Weil goto out_dput; 30094260f7c7SSage Weil 30104260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 30114260f7c7SSage Weil if (err) 30124260f7c7SSage Weil goto out_dput; 30135c39da5bSMiao Xie } 30144260f7c7SSage Weil 30155c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 30164260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 30174260f7c7SSage Weil if (err) 30184260f7c7SSage Weil goto out_dput; 30194260f7c7SSage Weil 30204a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 302176dda93cSYan, Zheng err = -EINVAL; 302276dda93cSYan, Zheng goto out_dput; 302376dda93cSYan, Zheng } 302476dda93cSYan, Zheng 30255955102cSAl Viro inode_lock(inode); 3026f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 30275955102cSAl Viro inode_unlock(inode); 302846008d9dSAmir Goldstein if (!err) { 302946008d9dSAmir Goldstein fsnotify_rmdir(dir, dentry); 303076dda93cSYan, Zheng d_delete(dentry); 303146008d9dSAmir Goldstein } 3032fa6ac876SLiu Bo 303376dda93cSYan, Zheng out_dput: 303476dda93cSYan, Zheng dput(dentry); 303576dda93cSYan, Zheng out_unlock_dir: 30365955102cSAl Viro inode_unlock(dir); 3037949964c9SMarcos Paulo de Souza free_subvol_name: 3038949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3039949964c9SMarcos Paulo de Souza free_parent: 3040949964c9SMarcos Paulo de Souza if (destroy_parent) 3041949964c9SMarcos Paulo de Souza dput(parent); 304200235411SAl Viro out_drop_write: 30432a79f17eSAl Viro mnt_drop_write_file(file); 304476dda93cSYan, Zheng out: 3045949964c9SMarcos Paulo de Souza kfree(vol_args2); 304676dda93cSYan, Zheng kfree(vol_args); 304776dda93cSYan, Zheng return err; 304876dda93cSYan, Zheng } 304976dda93cSYan, Zheng 30501e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3051f46b5a66SChristoph Hellwig { 3052496ad9aaSAl Viro struct inode *inode = file_inode(file); 3053f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 30541e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 3055c146afadSYan Zheng int ret; 3056c146afadSYan Zheng 305725122d15SIlya Dryomov ret = mnt_want_write_file(file); 305825122d15SIlya Dryomov if (ret) 305925122d15SIlya Dryomov return ret; 3060b83cc969SLi Zefan 306125122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 306225122d15SIlya Dryomov ret = -EROFS; 306325122d15SIlya Dryomov goto out; 30645ac00addSStefan Behrens } 3065f46b5a66SChristoph Hellwig 3066f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3067f46b5a66SChristoph Hellwig case S_IFDIR: 3068e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3069e441d54dSChris Mason ret = -EPERM; 3070e441d54dSChris Mason goto out; 3071e441d54dSChris Mason } 3072de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3073f46b5a66SChristoph Hellwig break; 3074f46b5a66SChristoph Hellwig case S_IFREG: 3075616d374eSAdam Borowski /* 3076616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3077616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3078616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3079616d374eSAdam Borowski */ 3080616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 3081616d374eSAdam Borowski inode_permission(inode, MAY_WRITE)) { 3082616d374eSAdam Borowski ret = -EPERM; 3083e441d54dSChris Mason goto out; 3084e441d54dSChris Mason } 30851e701a32SChris Mason 30861e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 30871e701a32SChris Mason if (!range) { 30881e701a32SChris Mason ret = -ENOMEM; 30891e701a32SChris Mason goto out; 30901e701a32SChris Mason } 30911e701a32SChris Mason 30921e701a32SChris Mason if (argp) { 30931e701a32SChris Mason if (copy_from_user(range, argp, 30941e701a32SChris Mason sizeof(*range))) { 30951e701a32SChris Mason ret = -EFAULT; 30961e701a32SChris Mason kfree(range); 3097683be16eSDan Carpenter goto out; 30981e701a32SChris Mason } 30991e701a32SChris Mason /* compression requires us to start the IO */ 31001e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 31011e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 31021e701a32SChris Mason range->extent_thresh = (u32)-1; 31031e701a32SChris Mason } 31041e701a32SChris Mason } else { 31051e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 31061e701a32SChris Mason range->len = (u64)-1; 31071e701a32SChris Mason } 3108496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 31097c829b72SAnand Jain range, BTRFS_OLDEST_GENERATION, 0); 31104cb5300bSChris Mason if (ret > 0) 31114cb5300bSChris Mason ret = 0; 31121e701a32SChris Mason kfree(range); 3113f46b5a66SChristoph Hellwig break; 31148929ecfaSYan, Zheng default: 31158929ecfaSYan, Zheng ret = -EINVAL; 3116f46b5a66SChristoph Hellwig } 3117e441d54dSChris Mason out: 311825122d15SIlya Dryomov mnt_drop_write_file(file); 3119e441d54dSChris Mason return ret; 3120f46b5a66SChristoph Hellwig } 3121f46b5a66SChristoph Hellwig 31222ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3123f46b5a66SChristoph Hellwig { 3124f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3125f46b5a66SChristoph Hellwig int ret; 3126f46b5a66SChristoph Hellwig 3127e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3128e441d54dSChris Mason return -EPERM; 3129e441d54dSChris Mason 3130171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) 3131e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3132c9e9f97bSIlya Dryomov 3133dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3134c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3135c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3136c9e9f97bSIlya Dryomov goto out; 3137c9e9f97bSIlya Dryomov } 3138f46b5a66SChristoph Hellwig 31395516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 31402ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3141f46b5a66SChristoph Hellwig 314243d20761SAnand Jain if (!ret) 31430b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 314443d20761SAnand Jain 3145f46b5a66SChristoph Hellwig kfree(vol_args); 3146c9e9f97bSIlya Dryomov out: 3147171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 3148f46b5a66SChristoph Hellwig return ret; 3149f46b5a66SChristoph Hellwig } 3150f46b5a66SChristoph Hellwig 31516b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3152f46b5a66SChristoph Hellwig { 31530b246afaSJeff Mahoney struct inode *inode = file_inode(file); 31540b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 31556b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 3156f46b5a66SChristoph Hellwig int ret; 3157f46b5a66SChristoph Hellwig 3158e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3159e441d54dSChris Mason return -EPERM; 3160e441d54dSChris Mason 3161da24927bSMiao Xie ret = mnt_want_write_file(file); 3162da24927bSMiao Xie if (ret) 3163da24927bSMiao Xie return ret; 3164c146afadSYan Zheng 3165dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3166c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3167c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3168c47ca32dSDan Carpenter goto err_drop; 3169c9e9f97bSIlya Dryomov } 3170f46b5a66SChristoph Hellwig 3171748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3172fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3173fd4e994bSOmar Sandoval goto out; 3174fd4e994bSOmar Sandoval } 3175f46b5a66SChristoph Hellwig 3176171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3177183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3178183860f6SAnand Jain goto out; 3179183860f6SAnand Jain } 3180183860f6SAnand Jain 3181735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 31822ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, NULL, vol_args->devid); 31836b526ed7SAnand Jain } else { 31846b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 31852ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 31866b526ed7SAnand Jain } 3187171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 3188183860f6SAnand Jain 31896b526ed7SAnand Jain if (!ret) { 3190735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 31910b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 31926b526ed7SAnand Jain vol_args->devid); 31936b526ed7SAnand Jain else 31940b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 31956b526ed7SAnand Jain vol_args->name); 31966b526ed7SAnand Jain } 3197183860f6SAnand Jain out: 3198183860f6SAnand Jain kfree(vol_args); 3199c47ca32dSDan Carpenter err_drop: 32004ac20c70SIlya Dryomov mnt_drop_write_file(file); 3201f46b5a66SChristoph Hellwig return ret; 3202f46b5a66SChristoph Hellwig } 3203f46b5a66SChristoph Hellwig 3204f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3205f46b5a66SChristoph Hellwig { 32060b246afaSJeff Mahoney struct inode *inode = file_inode(file); 32070b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3208f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3209f46b5a66SChristoph Hellwig int ret; 3210f46b5a66SChristoph Hellwig 3211f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3212f46b5a66SChristoph Hellwig return -EPERM; 3213f46b5a66SChristoph Hellwig 3214f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3215f46b5a66SChristoph Hellwig if (ret) 3216f46b5a66SChristoph Hellwig return ret; 3217f46b5a66SChristoph Hellwig 3218171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3219f46b5a66SChristoph Hellwig ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 322058d7bbf8SDavid Sterba goto out_drop_write; 322158d7bbf8SDavid Sterba } 322258d7bbf8SDavid Sterba 322358d7bbf8SDavid Sterba vol_args = memdup_user(arg, sizeof(*vol_args)); 322458d7bbf8SDavid Sterba if (IS_ERR(vol_args)) { 322558d7bbf8SDavid Sterba ret = PTR_ERR(vol_args); 3226f46b5a66SChristoph Hellwig goto out; 3227f46b5a66SChristoph Hellwig } 3228f46b5a66SChristoph Hellwig 322958d7bbf8SDavid Sterba vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 32302ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 3231f46b5a66SChristoph Hellwig 3232f46b5a66SChristoph Hellwig if (!ret) 32330b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3234f46b5a66SChristoph Hellwig kfree(vol_args); 323558d7bbf8SDavid Sterba out: 3236171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 323758d7bbf8SDavid Sterba out_drop_write: 3238f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 323958d7bbf8SDavid Sterba 3240f46b5a66SChristoph Hellwig return ret; 3241f46b5a66SChristoph Hellwig } 3242f46b5a66SChristoph Hellwig 32432ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 32442ff7e61eSJeff Mahoney void __user *arg) 3245475f6387SJan Schmidt { 3246027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3247475f6387SJan Schmidt struct btrfs_device *device; 32480b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3249137c5418SJohannes Thumshirn u64 flags_in; 3250027ed2f0SLi Zefan int ret = 0; 3251475f6387SJan Schmidt 3252137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3253137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3254137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3255137c5418SJohannes Thumshirn 3256137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3257137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3258027ed2f0SLi Zefan 3259d03262c7SDavid Sterba rcu_read_lock(); 3260027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3261475f6387SJan Schmidt 3262d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3263027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3264027ed2f0SLi Zefan fi_args->max_id = device->devid; 3265475f6387SJan Schmidt } 3266d03262c7SDavid Sterba rcu_read_unlock(); 3267475f6387SJan Schmidt 3268de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3269bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3270bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3271bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 327280a773fbSDavid Sterba 3273137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3274137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3275137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3276137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3277137c5418SJohannes Thumshirn } 3278137c5418SJohannes Thumshirn 32790fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 32800fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 32810fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 32820fb408a5SJohannes Thumshirn } 32830fb408a5SJohannes Thumshirn 328449bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 328549bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 328649bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 328749bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 328849bac897SJohannes Thumshirn } 328949bac897SJohannes Thumshirn 3290027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3291027ed2f0SLi Zefan ret = -EFAULT; 3292475f6387SJan Schmidt 3293027ed2f0SLi Zefan kfree(fi_args); 3294027ed2f0SLi Zefan return ret; 3295475f6387SJan Schmidt } 3296475f6387SJan Schmidt 32972ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 32982ff7e61eSJeff Mahoney void __user *arg) 3299475f6387SJan Schmidt { 3300475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3301475f6387SJan Schmidt struct btrfs_device *dev; 3302475f6387SJan Schmidt int ret = 0; 3303475f6387SJan Schmidt char *s_uuid = NULL; 3304475f6387SJan Schmidt 3305475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3306475f6387SJan Schmidt if (IS_ERR(di_args)) 3307475f6387SJan Schmidt return PTR_ERR(di_args); 3308475f6387SJan Schmidt 3309dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3310475f6387SJan Schmidt s_uuid = di_args->uuid; 3311475f6387SJan Schmidt 3312c5593ca3SDavid Sterba rcu_read_lock(); 3313e4319cd9SAnand Jain dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid, 331409ba3bc9SAnand Jain NULL, true); 3315475f6387SJan Schmidt 3316475f6387SJan Schmidt if (!dev) { 3317475f6387SJan Schmidt ret = -ENODEV; 3318475f6387SJan Schmidt goto out; 3319475f6387SJan Schmidt } 3320475f6387SJan Schmidt 3321475f6387SJan Schmidt di_args->devid = dev->devid; 33227cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 33237cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3324475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3325a27202fbSJim Meyering if (dev->name) { 3326672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3327672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3328a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3329a27202fbSJim Meyering } else { 333099ba55adSStefan Behrens di_args->path[0] = '\0'; 3331a27202fbSJim Meyering } 3332475f6387SJan Schmidt 3333475f6387SJan Schmidt out: 3334c5593ca3SDavid Sterba rcu_read_unlock(); 3335475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3336475f6387SJan Schmidt ret = -EFAULT; 3337475f6387SJan Schmidt 3338475f6387SJan Schmidt kfree(di_args); 3339475f6387SJan Schmidt return ret; 3340475f6387SJan Schmidt } 3341475f6387SJan Schmidt 33426ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 33436ef5ed0dSJosef Bacik { 3344496ad9aaSAl Viro struct inode *inode = file_inode(file); 33450b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 33466ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 33476ef5ed0dSJosef Bacik struct btrfs_root *new_root; 33486ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 33496ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 33502a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 33516ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 33526ef5ed0dSJosef Bacik u64 objectid = 0; 33536ef5ed0dSJosef Bacik u64 dir_id; 33543c04ce01SMiao Xie int ret; 33556ef5ed0dSJosef Bacik 33566ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 33576ef5ed0dSJosef Bacik return -EPERM; 33586ef5ed0dSJosef Bacik 33593c04ce01SMiao Xie ret = mnt_want_write_file(file); 33603c04ce01SMiao Xie if (ret) 33613c04ce01SMiao Xie return ret; 33623c04ce01SMiao Xie 33633c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 33643c04ce01SMiao Xie ret = -EFAULT; 33653c04ce01SMiao Xie goto out; 33663c04ce01SMiao Xie } 33676ef5ed0dSJosef Bacik 33686ef5ed0dSJosef Bacik if (!objectid) 33691cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 33706ef5ed0dSJosef Bacik 337156e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 33723c04ce01SMiao Xie if (IS_ERR(new_root)) { 33733c04ce01SMiao Xie ret = PTR_ERR(new_root); 33743c04ce01SMiao Xie goto out; 33753c04ce01SMiao Xie } 33762a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 33772a2b5d62SJosef Bacik ret = -ENOENT; 33782a2b5d62SJosef Bacik goto out_free; 33792a2b5d62SJosef Bacik } 33806ef5ed0dSJosef Bacik 33816ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 33823c04ce01SMiao Xie if (!path) { 33833c04ce01SMiao Xie ret = -ENOMEM; 33842a2b5d62SJosef Bacik goto out_free; 33853c04ce01SMiao Xie } 33866ef5ed0dSJosef Bacik path->leave_spinning = 1; 33876ef5ed0dSJosef Bacik 33886ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 338998d5dc13STsutomu Itoh if (IS_ERR(trans)) { 33903c04ce01SMiao Xie ret = PTR_ERR(trans); 33912a2b5d62SJosef Bacik goto out_free; 33926ef5ed0dSJosef Bacik } 33936ef5ed0dSJosef Bacik 33940b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 33950b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 33966ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3397cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 33982a2b5d62SJosef Bacik btrfs_release_path(path); 33993a45bb20SJeff Mahoney btrfs_end_transaction(trans); 34000b246afaSJeff Mahoney btrfs_err(fs_info, 34015d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 34023c04ce01SMiao Xie ret = -ENOENT; 34032a2b5d62SJosef Bacik goto out_free; 34046ef5ed0dSJosef Bacik } 34056ef5ed0dSJosef Bacik 34066ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 34076ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 34086ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 34092a2b5d62SJosef Bacik btrfs_release_path(path); 34106ef5ed0dSJosef Bacik 34110b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 34123a45bb20SJeff Mahoney btrfs_end_transaction(trans); 34132a2b5d62SJosef Bacik out_free: 341400246528SJosef Bacik btrfs_put_root(new_root); 34152a2b5d62SJosef Bacik btrfs_free_path(path); 34163c04ce01SMiao Xie out: 34173c04ce01SMiao Xie mnt_drop_write_file(file); 34183c04ce01SMiao Xie return ret; 34196ef5ed0dSJosef Bacik } 34206ef5ed0dSJosef Bacik 3421c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3422bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3423bf5fc093SJosef Bacik { 342432da5386SDavid Sterba struct btrfs_block_group *block_group; 3425bf5fc093SJosef Bacik 3426bf5fc093SJosef Bacik space->total_bytes = 0; 3427bf5fc093SJosef Bacik space->used_bytes = 0; 3428bf5fc093SJosef Bacik space->flags = 0; 3429bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3430bf5fc093SJosef Bacik space->flags = block_group->flags; 3431b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3432bf38be65SDavid Sterba space->used_bytes += block_group->used; 3433bf5fc093SJosef Bacik } 3434bf5fc093SJosef Bacik } 3435bf5fc093SJosef Bacik 34362ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 34372ff7e61eSJeff Mahoney void __user *arg) 34381406e432SJosef Bacik { 34391406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 34401406e432SJosef Bacik struct btrfs_ioctl_space_info space; 34411406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 34427fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 344313f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 34441406e432SJosef Bacik struct btrfs_space_info *info; 3445315d8e98SColin Ian King static const u64 types[] = { 3446315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3447bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3448bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3449315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3450315d8e98SColin Ian King }; 3451bf5fc093SJosef Bacik int num_types = 4; 34527fde62bfSChris Mason int alloc_size; 34531406e432SJosef Bacik int ret = 0; 345451788b1bSDan Rosenberg u64 slot_count = 0; 3455bf5fc093SJosef Bacik int i, c; 34561406e432SJosef Bacik 34571406e432SJosef Bacik if (copy_from_user(&space_args, 34581406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 34591406e432SJosef Bacik sizeof(space_args))) 34601406e432SJosef Bacik return -EFAULT; 34611406e432SJosef Bacik 3462bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3463bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3464bf5fc093SJosef Bacik 3465bf5fc093SJosef Bacik info = NULL; 34667fde62bfSChris Mason rcu_read_lock(); 34670b246afaSJeff Mahoney list_for_each_entry_rcu(tmp, &fs_info->space_info, 3468bf5fc093SJosef Bacik list) { 3469bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3470bf5fc093SJosef Bacik info = tmp; 3471bf5fc093SJosef Bacik break; 3472bf5fc093SJosef Bacik } 3473bf5fc093SJosef Bacik } 34747fde62bfSChris Mason rcu_read_unlock(); 34751406e432SJosef Bacik 3476bf5fc093SJosef Bacik if (!info) 3477bf5fc093SJosef Bacik continue; 3478bf5fc093SJosef Bacik 3479bf5fc093SJosef Bacik down_read(&info->groups_sem); 3480bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3481bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3482bf5fc093SJosef Bacik slot_count++; 3483bf5fc093SJosef Bacik } 3484bf5fc093SJosef Bacik up_read(&info->groups_sem); 3485bf5fc093SJosef Bacik } 3486bf5fc093SJosef Bacik 348736523e95SDavid Sterba /* 348836523e95SDavid Sterba * Global block reserve, exported as a space_info 348936523e95SDavid Sterba */ 349036523e95SDavid Sterba slot_count++; 349136523e95SDavid Sterba 34927fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 34937fde62bfSChris Mason if (space_args.space_slots == 0) { 34947fde62bfSChris Mason space_args.total_spaces = slot_count; 34957fde62bfSChris Mason goto out; 34967fde62bfSChris Mason } 3497bf5fc093SJosef Bacik 349851788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3499bf5fc093SJosef Bacik 35007fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3501bf5fc093SJosef Bacik 35027fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 35037fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 35047fde62bfSChris Mason */ 350509cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 35067fde62bfSChris Mason return -ENOMEM; 35077fde62bfSChris Mason 35087fde62bfSChris Mason space_args.total_spaces = 0; 35098d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 35107fde62bfSChris Mason if (!dest) 35117fde62bfSChris Mason return -ENOMEM; 35127fde62bfSChris Mason dest_orig = dest; 35137fde62bfSChris Mason 35147fde62bfSChris Mason /* now we have a buffer to copy into */ 3515bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3516bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3517bf5fc093SJosef Bacik 351851788b1bSDan Rosenberg if (!slot_count) 351951788b1bSDan Rosenberg break; 352051788b1bSDan Rosenberg 3521bf5fc093SJosef Bacik info = NULL; 35221406e432SJosef Bacik rcu_read_lock(); 35230b246afaSJeff Mahoney list_for_each_entry_rcu(tmp, &fs_info->space_info, 3524bf5fc093SJosef Bacik list) { 3525bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3526bf5fc093SJosef Bacik info = tmp; 35277fde62bfSChris Mason break; 3528bf5fc093SJosef Bacik } 3529bf5fc093SJosef Bacik } 3530bf5fc093SJosef Bacik rcu_read_unlock(); 35317fde62bfSChris Mason 3532bf5fc093SJosef Bacik if (!info) 3533bf5fc093SJosef Bacik continue; 3534bf5fc093SJosef Bacik down_read(&info->groups_sem); 3535bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3536bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3537c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3538c065f5b1SSu Yue &space); 35397fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 35401406e432SJosef Bacik dest++; 35411406e432SJosef Bacik space_args.total_spaces++; 354251788b1bSDan Rosenberg slot_count--; 35431406e432SJosef Bacik } 354451788b1bSDan Rosenberg if (!slot_count) 354551788b1bSDan Rosenberg break; 3546bf5fc093SJosef Bacik } 3547bf5fc093SJosef Bacik up_read(&info->groups_sem); 3548bf5fc093SJosef Bacik } 35491406e432SJosef Bacik 355036523e95SDavid Sterba /* 355136523e95SDavid Sterba * Add global block reserve 355236523e95SDavid Sterba */ 355336523e95SDavid Sterba if (slot_count) { 35540b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 355536523e95SDavid Sterba 355636523e95SDavid Sterba spin_lock(&block_rsv->lock); 355736523e95SDavid Sterba space.total_bytes = block_rsv->size; 355836523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 355936523e95SDavid Sterba spin_unlock(&block_rsv->lock); 356036523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 356136523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 356236523e95SDavid Sterba space_args.total_spaces++; 356336523e95SDavid Sterba } 356436523e95SDavid Sterba 35652eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 35667fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 35677fde62bfSChris Mason 35687fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 35697fde62bfSChris Mason ret = -EFAULT; 35707fde62bfSChris Mason 35717fde62bfSChris Mason kfree(dest_orig); 35727fde62bfSChris Mason out: 35737fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 35741406e432SJosef Bacik ret = -EFAULT; 35751406e432SJosef Bacik 35761406e432SJosef Bacik return ret; 35771406e432SJosef Bacik } 35781406e432SJosef Bacik 35799a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 35809a8c28beSMiao Xie void __user *argp) 358146204592SSage Weil { 358246204592SSage Weil struct btrfs_trans_handle *trans; 358346204592SSage Weil u64 transid; 3584db5b493aSTsutomu Itoh int ret; 358546204592SSage Weil 3586d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3587ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3588ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 358998d5dc13STsutomu Itoh return PTR_ERR(trans); 3590ff7c1d33SMiao Xie 3591ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3592ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3593ff7c1d33SMiao Xie goto out; 3594ff7c1d33SMiao Xie } 359546204592SSage Weil transid = trans->transid; 35963a45bb20SJeff Mahoney ret = btrfs_commit_transaction_async(trans, 0); 35978b2b2d3cSTsutomu Itoh if (ret) { 35983a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3599db5b493aSTsutomu Itoh return ret; 36008b2b2d3cSTsutomu Itoh } 3601ff7c1d33SMiao Xie out: 360246204592SSage Weil if (argp) 360346204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 360446204592SSage Weil return -EFAULT; 360546204592SSage Weil return 0; 360646204592SSage Weil } 360746204592SSage Weil 36082ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 36099a8c28beSMiao Xie void __user *argp) 361046204592SSage Weil { 361146204592SSage Weil u64 transid; 361246204592SSage Weil 361346204592SSage Weil if (argp) { 361446204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 361546204592SSage Weil return -EFAULT; 361646204592SSage Weil } else { 361746204592SSage Weil transid = 0; /* current trans */ 361846204592SSage Weil } 36192ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 362046204592SSage Weil } 362146204592SSage Weil 3622b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3623475f6387SJan Schmidt { 36240b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3625475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3626b8e95489SMiao Xie int ret; 3627475f6387SJan Schmidt 3628475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3629475f6387SJan Schmidt return -EPERM; 3630475f6387SJan Schmidt 3631475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3632475f6387SJan Schmidt if (IS_ERR(sa)) 3633475f6387SJan Schmidt return PTR_ERR(sa); 3634475f6387SJan Schmidt 3635b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3636b8e95489SMiao Xie ret = mnt_want_write_file(file); 3637b8e95489SMiao Xie if (ret) 3638b8e95489SMiao Xie goto out; 3639b8e95489SMiao Xie } 3640b8e95489SMiao Xie 36410b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 364263a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 364363a212abSStefan Behrens 0); 3644475f6387SJan Schmidt 36455afe6ce7SFilipe Manana /* 36465afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 36475afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 36485afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 36495afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 36505afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 36515afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 36525afe6ce7SFilipe Manana * previously (btrfs-progs does this). 36535afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 36545afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 36555afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 36565afe6ce7SFilipe Manana */ 36575afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3658475f6387SJan Schmidt ret = -EFAULT; 3659475f6387SJan Schmidt 3660b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3661b8e95489SMiao Xie mnt_drop_write_file(file); 3662b8e95489SMiao Xie out: 3663475f6387SJan Schmidt kfree(sa); 3664475f6387SJan Schmidt return ret; 3665475f6387SJan Schmidt } 3666475f6387SJan Schmidt 36672ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3668475f6387SJan Schmidt { 3669475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3670475f6387SJan Schmidt return -EPERM; 3671475f6387SJan Schmidt 36722ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3673475f6387SJan Schmidt } 3674475f6387SJan Schmidt 36752ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3676475f6387SJan Schmidt void __user *arg) 3677475f6387SJan Schmidt { 3678475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3679475f6387SJan Schmidt int ret; 3680475f6387SJan Schmidt 3681475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3682475f6387SJan Schmidt return -EPERM; 3683475f6387SJan Schmidt 3684475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3685475f6387SJan Schmidt if (IS_ERR(sa)) 3686475f6387SJan Schmidt return PTR_ERR(sa); 3687475f6387SJan Schmidt 36882ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3689475f6387SJan Schmidt 36904fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3691475f6387SJan Schmidt ret = -EFAULT; 3692475f6387SJan Schmidt 3693475f6387SJan Schmidt kfree(sa); 3694475f6387SJan Schmidt return ret; 3695475f6387SJan Schmidt } 3696475f6387SJan Schmidt 36972ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3698b27f7c0cSDavid Sterba void __user *arg) 3699c11d2c23SStefan Behrens { 3700c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3701c11d2c23SStefan Behrens int ret; 3702c11d2c23SStefan Behrens 3703c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3704c11d2c23SStefan Behrens if (IS_ERR(sa)) 3705c11d2c23SStefan Behrens return PTR_ERR(sa); 3706c11d2c23SStefan Behrens 3707b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3708b27f7c0cSDavid Sterba kfree(sa); 3709b27f7c0cSDavid Sterba return -EPERM; 3710b27f7c0cSDavid Sterba } 3711b27f7c0cSDavid Sterba 37122ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3713c11d2c23SStefan Behrens 3714eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3715c11d2c23SStefan Behrens ret = -EFAULT; 3716c11d2c23SStefan Behrens 3717c11d2c23SStefan Behrens kfree(sa); 3718c11d2c23SStefan Behrens return ret; 3719c11d2c23SStefan Behrens } 3720c11d2c23SStefan Behrens 37212ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 37222ff7e61eSJeff Mahoney void __user *arg) 37233f6bcfbdSStefan Behrens { 37243f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 37253f6bcfbdSStefan Behrens int ret; 37263f6bcfbdSStefan Behrens 37273f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 37283f6bcfbdSStefan Behrens return -EPERM; 37293f6bcfbdSStefan Behrens 37303f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 37313f6bcfbdSStefan Behrens if (IS_ERR(p)) 37323f6bcfbdSStefan Behrens return PTR_ERR(p); 37333f6bcfbdSStefan Behrens 37343f6bcfbdSStefan Behrens switch (p->cmd) { 37353f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3736bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3737adfa97cbSIlya Dryomov ret = -EROFS; 3738adfa97cbSIlya Dryomov goto out; 3739adfa97cbSIlya Dryomov } 3740171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3741e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 37423f6bcfbdSStefan Behrens } else { 37432ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3744171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 37453f6bcfbdSStefan Behrens } 37463f6bcfbdSStefan Behrens break; 37473f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 37480b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 37493f6bcfbdSStefan Behrens ret = 0; 37503f6bcfbdSStefan Behrens break; 37513f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 375217d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 375397282031SAnand Jain ret = 0; 37543f6bcfbdSStefan Behrens break; 37553f6bcfbdSStefan Behrens default: 37563f6bcfbdSStefan Behrens ret = -EINVAL; 37573f6bcfbdSStefan Behrens break; 37583f6bcfbdSStefan Behrens } 37593f6bcfbdSStefan Behrens 3760d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 37613f6bcfbdSStefan Behrens ret = -EFAULT; 3762adfa97cbSIlya Dryomov out: 37633f6bcfbdSStefan Behrens kfree(p); 37643f6bcfbdSStefan Behrens return ret; 37653f6bcfbdSStefan Behrens } 37663f6bcfbdSStefan Behrens 3767d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3768d7728c96SJan Schmidt { 3769d7728c96SJan Schmidt int ret = 0; 3770d7728c96SJan Schmidt int i; 3771740c3d22SChris Mason u64 rel_ptr; 3772d7728c96SJan Schmidt int size; 3773806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3774d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3775d7728c96SJan Schmidt struct btrfs_path *path; 3776d7728c96SJan Schmidt 377782b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3778d7728c96SJan Schmidt return -EPERM; 3779d7728c96SJan Schmidt 3780d7728c96SJan Schmidt path = btrfs_alloc_path(); 3781d7728c96SJan Schmidt if (!path) { 3782d7728c96SJan Schmidt ret = -ENOMEM; 3783d7728c96SJan Schmidt goto out; 3784d7728c96SJan Schmidt } 3785d7728c96SJan Schmidt 3786d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3787d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3788d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3789d7728c96SJan Schmidt ipa = NULL; 3790d7728c96SJan Schmidt goto out; 3791d7728c96SJan Schmidt } 3792d7728c96SJan Schmidt 3793d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3794d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3795d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3796d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3797d7728c96SJan Schmidt ipath = NULL; 3798d7728c96SJan Schmidt goto out; 3799d7728c96SJan Schmidt } 3800d7728c96SJan Schmidt 3801d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3802d7728c96SJan Schmidt if (ret < 0) 3803d7728c96SJan Schmidt goto out; 3804d7728c96SJan Schmidt 3805d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3806745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3807745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3808740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3809d7728c96SJan Schmidt } 3810d7728c96SJan Schmidt 3811718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3812718dc5faSOmar Sandoval ipath->fspath, size); 3813d7728c96SJan Schmidt if (ret) { 3814d7728c96SJan Schmidt ret = -EFAULT; 3815d7728c96SJan Schmidt goto out; 3816d7728c96SJan Schmidt } 3817d7728c96SJan Schmidt 3818d7728c96SJan Schmidt out: 3819d7728c96SJan Schmidt btrfs_free_path(path); 3820d7728c96SJan Schmidt free_ipath(ipath); 3821d7728c96SJan Schmidt kfree(ipa); 3822d7728c96SJan Schmidt 3823d7728c96SJan Schmidt return ret; 3824d7728c96SJan Schmidt } 3825d7728c96SJan Schmidt 3826d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3827d7728c96SJan Schmidt { 3828d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3829d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3830d7728c96SJan Schmidt 3831d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3832d7728c96SJan Schmidt inodes->bytes_left -= c; 3833d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3834d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3835d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3836d7728c96SJan Schmidt inodes->elem_cnt += 3; 3837d7728c96SJan Schmidt } else { 3838d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3839d7728c96SJan Schmidt inodes->bytes_left = 0; 3840d7728c96SJan Schmidt inodes->elem_missed += 3; 3841d7728c96SJan Schmidt } 3842d7728c96SJan Schmidt 3843d7728c96SJan Schmidt return 0; 3844d7728c96SJan Schmidt } 3845d7728c96SJan Schmidt 38462ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3847d24a67b2SZygo Blaxell void __user *arg, int version) 3848d7728c96SJan Schmidt { 3849d7728c96SJan Schmidt int ret = 0; 3850d7728c96SJan Schmidt int size; 3851d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3852d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3853d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3854d24a67b2SZygo Blaxell bool ignore_offset; 3855d7728c96SJan Schmidt 3856d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3857d7728c96SJan Schmidt return -EPERM; 3858d7728c96SJan Schmidt 3859d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 38607b9ea627SShailendra Verma if (IS_ERR(loi)) 38617b9ea627SShailendra Verma return PTR_ERR(loi); 3862d7728c96SJan Schmidt 3863d24a67b2SZygo Blaxell if (version == 1) { 3864d24a67b2SZygo Blaxell ignore_offset = false; 3865b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 3866d24a67b2SZygo Blaxell } else { 3867d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 3868d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 3869d24a67b2SZygo Blaxell ret = -EINVAL; 3870d24a67b2SZygo Blaxell goto out_loi; 3871d24a67b2SZygo Blaxell } 3872d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 3873d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 3874d24a67b2SZygo Blaxell ret = -EINVAL; 3875d24a67b2SZygo Blaxell goto out_loi; 3876d24a67b2SZygo Blaxell } 3877d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 3878b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 3879d24a67b2SZygo Blaxell } 3880d24a67b2SZygo Blaxell 3881d7728c96SJan Schmidt path = btrfs_alloc_path(); 3882d7728c96SJan Schmidt if (!path) { 3883d7728c96SJan Schmidt ret = -ENOMEM; 3884d7728c96SJan Schmidt goto out; 3885d7728c96SJan Schmidt } 3886d7728c96SJan Schmidt 3887d7728c96SJan Schmidt inodes = init_data_container(size); 3888d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3889d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3890d7728c96SJan Schmidt inodes = NULL; 3891d7728c96SJan Schmidt goto out; 3892d7728c96SJan Schmidt } 3893d7728c96SJan Schmidt 38942ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 3895d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 3896df031f07SLiu Bo if (ret == -EINVAL) 3897d7728c96SJan Schmidt ret = -ENOENT; 3898d7728c96SJan Schmidt if (ret < 0) 3899d7728c96SJan Schmidt goto out; 3900d7728c96SJan Schmidt 3901718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 3902718dc5faSOmar Sandoval size); 3903d7728c96SJan Schmidt if (ret) 3904d7728c96SJan Schmidt ret = -EFAULT; 3905d7728c96SJan Schmidt 3906d7728c96SJan Schmidt out: 3907d7728c96SJan Schmidt btrfs_free_path(path); 3908f54de068SDavid Sterba kvfree(inodes); 3909d24a67b2SZygo Blaxell out_loi: 3910d7728c96SJan Schmidt kfree(loi); 3911d7728c96SJan Schmidt 3912d7728c96SJan Schmidt return ret; 3913d7728c96SJan Schmidt } 3914d7728c96SJan Schmidt 3915008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 3916c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3917c9e9f97bSIlya Dryomov { 3918c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3919c9e9f97bSIlya Dryomov 3920c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3921c9e9f97bSIlya Dryomov 39223009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 3923837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3924837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3925837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3926a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3927a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3928837d5b6eSIlya Dryomov 3929c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3930c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3931c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 393219a39dceSIlya Dryomov 393319a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 393419a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 393519a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 3936c9e9f97bSIlya Dryomov } 3937c9e9f97bSIlya Dryomov 39389ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3939c9e9f97bSIlya Dryomov { 3940496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3941c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3942c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3943c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3944ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 3945c9e9f97bSIlya Dryomov int ret; 3946c9e9f97bSIlya Dryomov 3947c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3948c9e9f97bSIlya Dryomov return -EPERM; 3949c9e9f97bSIlya Dryomov 3950e54bfa31SLiu Bo ret = mnt_want_write_file(file); 39519ba1f6e4SLiu Bo if (ret) 39529ba1f6e4SLiu Bo return ret; 39539ba1f6e4SLiu Bo 3954ed0fb78fSIlya Dryomov again: 3955171938e5SDavid Sterba if (!test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3956c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3957ed0fb78fSIlya Dryomov need_unlock = true; 3958ed0fb78fSIlya Dryomov goto locked; 3959ed0fb78fSIlya Dryomov } 3960ed0fb78fSIlya Dryomov 3961ed0fb78fSIlya Dryomov /* 396201327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 3963ed0fb78fSIlya Dryomov * (1) some other op is running 3964ed0fb78fSIlya Dryomov * (2) balance is running 3965ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 3966ed0fb78fSIlya Dryomov */ 3967ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3968ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3969ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 39703009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 3971ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3972dccdb07bSDavid Sterba /* 3973dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 3974dccdb07bSDavid Sterba * we'll reexamine the status again. 3975dccdb07bSDavid Sterba */ 3976ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3977ed0fb78fSIlya Dryomov 3978ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 39793009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 3980ed0fb78fSIlya Dryomov /* this is (3) */ 3981ed0fb78fSIlya Dryomov need_unlock = false; 3982ed0fb78fSIlya Dryomov goto locked; 3983ed0fb78fSIlya Dryomov } 3984ed0fb78fSIlya Dryomov 3985ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3986ed0fb78fSIlya Dryomov goto again; 3987ed0fb78fSIlya Dryomov } else { 3988ed0fb78fSIlya Dryomov /* this is (2) */ 3989ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3990ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 3991ed0fb78fSIlya Dryomov goto out; 3992ed0fb78fSIlya Dryomov } 3993ed0fb78fSIlya Dryomov } else { 3994ed0fb78fSIlya Dryomov /* this is (1) */ 3995ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3996e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3997ed0fb78fSIlya Dryomov goto out; 3998ed0fb78fSIlya Dryomov } 3999ed0fb78fSIlya Dryomov 4000ed0fb78fSIlya Dryomov locked: 4001171938e5SDavid Sterba BUG_ON(!test_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)); 4002c9e9f97bSIlya Dryomov 4003c9e9f97bSIlya Dryomov if (arg) { 4004c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4005c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4006c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4007ed0fb78fSIlya Dryomov goto out_unlock; 4008c9e9f97bSIlya Dryomov } 4009de322263SIlya Dryomov 4010de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4011de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4012de322263SIlya Dryomov ret = -ENOTCONN; 4013de322263SIlya Dryomov goto out_bargs; 4014de322263SIlya Dryomov } 4015de322263SIlya Dryomov 4016de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4017de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4018de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4019de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4020de322263SIlya Dryomov 4021de322263SIlya Dryomov goto do_balance; 4022de322263SIlya Dryomov } 4023c9e9f97bSIlya Dryomov } else { 4024c9e9f97bSIlya Dryomov bargs = NULL; 4025c9e9f97bSIlya Dryomov } 4026c9e9f97bSIlya Dryomov 4027ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4028837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4029837d5b6eSIlya Dryomov goto out_bargs; 4030837d5b6eSIlya Dryomov } 4031837d5b6eSIlya Dryomov 40328d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4033c9e9f97bSIlya Dryomov if (!bctl) { 4034c9e9f97bSIlya Dryomov ret = -ENOMEM; 4035c9e9f97bSIlya Dryomov goto out_bargs; 4036c9e9f97bSIlya Dryomov } 4037c9e9f97bSIlya Dryomov 4038c9e9f97bSIlya Dryomov if (arg) { 4039c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4040c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4041c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4042c9e9f97bSIlya Dryomov 4043c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4044f43ffb60SIlya Dryomov } else { 4045f43ffb60SIlya Dryomov /* balance everything - no filters */ 4046f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4047c9e9f97bSIlya Dryomov } 4048c9e9f97bSIlya Dryomov 40498eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 40508eb93459SDavid Sterba ret = -EINVAL; 40510f89abf5SChristian Engelmayer goto out_bctl; 40528eb93459SDavid Sterba } 40538eb93459SDavid Sterba 4054de322263SIlya Dryomov do_balance: 4055c9e9f97bSIlya Dryomov /* 4056149196a2SDavid Sterba * Ownership of bctl and filesystem flag BTRFS_FS_EXCL_OP goes to 4057149196a2SDavid Sterba * btrfs_balance. bctl is freed in reset_balance_state, or, if 4058149196a2SDavid Sterba * restriper was paused all the way until unmount, in free_fs_info. 4059149196a2SDavid Sterba * The flag should be cleared after reset_balance_state. 4060c9e9f97bSIlya Dryomov */ 4061ed0fb78fSIlya Dryomov need_unlock = false; 4062ed0fb78fSIlya Dryomov 40636fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 40640f89abf5SChristian Engelmayer bctl = NULL; 4065ed0fb78fSIlya Dryomov 4066d00c2d9cSFilipe Manana if ((ret == 0 || ret == -ECANCELED) && arg) { 4067c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4068c9e9f97bSIlya Dryomov ret = -EFAULT; 4069c9e9f97bSIlya Dryomov } 4070c9e9f97bSIlya Dryomov 40710f89abf5SChristian Engelmayer out_bctl: 40720f89abf5SChristian Engelmayer kfree(bctl); 4073c9e9f97bSIlya Dryomov out_bargs: 4074c9e9f97bSIlya Dryomov kfree(bargs); 4075ed0fb78fSIlya Dryomov out_unlock: 4076c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4077ed0fb78fSIlya Dryomov if (need_unlock) 4078171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 4079ed0fb78fSIlya Dryomov out: 4080e54bfa31SLiu Bo mnt_drop_write_file(file); 4081c9e9f97bSIlya Dryomov return ret; 4082c9e9f97bSIlya Dryomov } 4083c9e9f97bSIlya Dryomov 40842ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4085837d5b6eSIlya Dryomov { 4086837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4087837d5b6eSIlya Dryomov return -EPERM; 4088837d5b6eSIlya Dryomov 4089837d5b6eSIlya Dryomov switch (cmd) { 4090837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 40910b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4092a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 40930b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4094837d5b6eSIlya Dryomov } 4095837d5b6eSIlya Dryomov 4096837d5b6eSIlya Dryomov return -EINVAL; 4097837d5b6eSIlya Dryomov } 4098837d5b6eSIlya Dryomov 40992ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 410019a39dceSIlya Dryomov void __user *arg) 410119a39dceSIlya Dryomov { 410219a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 410319a39dceSIlya Dryomov int ret = 0; 410419a39dceSIlya Dryomov 410519a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 410619a39dceSIlya Dryomov return -EPERM; 410719a39dceSIlya Dryomov 410819a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 410919a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 411019a39dceSIlya Dryomov ret = -ENOTCONN; 411119a39dceSIlya Dryomov goto out; 411219a39dceSIlya Dryomov } 411319a39dceSIlya Dryomov 41148d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 411519a39dceSIlya Dryomov if (!bargs) { 411619a39dceSIlya Dryomov ret = -ENOMEM; 411719a39dceSIlya Dryomov goto out; 411819a39dceSIlya Dryomov } 411919a39dceSIlya Dryomov 4120008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 412119a39dceSIlya Dryomov 412219a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 412319a39dceSIlya Dryomov ret = -EFAULT; 412419a39dceSIlya Dryomov 412519a39dceSIlya Dryomov kfree(bargs); 412619a39dceSIlya Dryomov out: 412719a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 412819a39dceSIlya Dryomov return ret; 412919a39dceSIlya Dryomov } 413019a39dceSIlya Dryomov 4131905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 41325d13a37bSArne Jansen { 41330b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41340b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41355d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 41365d13a37bSArne Jansen int ret; 41375d13a37bSArne Jansen 41385d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41395d13a37bSArne Jansen return -EPERM; 41405d13a37bSArne Jansen 4141905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4142905b0ddaSMiao Xie if (ret) 4143905b0ddaSMiao Xie return ret; 41445d13a37bSArne Jansen 41455d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4146905b0ddaSMiao Xie if (IS_ERR(sa)) { 4147905b0ddaSMiao Xie ret = PTR_ERR(sa); 4148905b0ddaSMiao Xie goto drop_write; 4149905b0ddaSMiao Xie } 41505d13a37bSArne Jansen 41510b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 41525d13a37bSArne Jansen 41535d13a37bSArne Jansen switch (sa->cmd) { 41545d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4155340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 41565d13a37bSArne Jansen break; 41575d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4158340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 41595d13a37bSArne Jansen break; 41605d13a37bSArne Jansen default: 41615d13a37bSArne Jansen ret = -EINVAL; 41625d13a37bSArne Jansen break; 41635d13a37bSArne Jansen } 41645d13a37bSArne Jansen 41655d13a37bSArne Jansen kfree(sa); 41660b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4167905b0ddaSMiao Xie drop_write: 4168905b0ddaSMiao Xie mnt_drop_write_file(file); 41695d13a37bSArne Jansen return ret; 41705d13a37bSArne Jansen } 41715d13a37bSArne Jansen 4172905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 41735d13a37bSArne Jansen { 41740b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41750b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41760b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 41775d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 41785d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41795d13a37bSArne Jansen int ret; 41805d13a37bSArne Jansen int err; 41815d13a37bSArne Jansen 41825d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41835d13a37bSArne Jansen return -EPERM; 41845d13a37bSArne Jansen 4185905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4186905b0ddaSMiao Xie if (ret) 4187905b0ddaSMiao Xie return ret; 41885d13a37bSArne Jansen 41895d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4190905b0ddaSMiao Xie if (IS_ERR(sa)) { 4191905b0ddaSMiao Xie ret = PTR_ERR(sa); 4192905b0ddaSMiao Xie goto drop_write; 4193905b0ddaSMiao Xie } 41945d13a37bSArne Jansen 41955d13a37bSArne Jansen trans = btrfs_join_transaction(root); 41965d13a37bSArne Jansen if (IS_ERR(trans)) { 41975d13a37bSArne Jansen ret = PTR_ERR(trans); 41985d13a37bSArne Jansen goto out; 41995d13a37bSArne Jansen } 42005d13a37bSArne Jansen 42015d13a37bSArne Jansen if (sa->assign) { 42029f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 42035d13a37bSArne Jansen } else { 420439616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 42055d13a37bSArne Jansen } 42065d13a37bSArne Jansen 4207e082f563SQu Wenruo /* update qgroup status and info */ 4208280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4209e082f563SQu Wenruo if (err < 0) 42100b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4211ad8403dfSAnand Jain "failed to update qgroup status and info"); 42123a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 42135d13a37bSArne Jansen if (err && !ret) 42145d13a37bSArne Jansen ret = err; 42155d13a37bSArne Jansen 42165d13a37bSArne Jansen out: 42175d13a37bSArne Jansen kfree(sa); 4218905b0ddaSMiao Xie drop_write: 4219905b0ddaSMiao Xie mnt_drop_write_file(file); 42205d13a37bSArne Jansen return ret; 42215d13a37bSArne Jansen } 42225d13a37bSArne Jansen 4223905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 42245d13a37bSArne Jansen { 42250b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42260b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42275d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 42285d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42295d13a37bSArne Jansen int ret; 42305d13a37bSArne Jansen int err; 42315d13a37bSArne Jansen 42325d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42335d13a37bSArne Jansen return -EPERM; 42345d13a37bSArne Jansen 4235905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4236905b0ddaSMiao Xie if (ret) 4237905b0ddaSMiao Xie return ret; 42385d13a37bSArne Jansen 42395d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4240905b0ddaSMiao Xie if (IS_ERR(sa)) { 4241905b0ddaSMiao Xie ret = PTR_ERR(sa); 4242905b0ddaSMiao Xie goto drop_write; 4243905b0ddaSMiao Xie } 42445d13a37bSArne Jansen 4245d86e56cfSMiao Xie if (!sa->qgroupid) { 4246d86e56cfSMiao Xie ret = -EINVAL; 4247d86e56cfSMiao Xie goto out; 4248d86e56cfSMiao Xie } 4249d86e56cfSMiao Xie 42505d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42515d13a37bSArne Jansen if (IS_ERR(trans)) { 42525d13a37bSArne Jansen ret = PTR_ERR(trans); 42535d13a37bSArne Jansen goto out; 42545d13a37bSArne Jansen } 42555d13a37bSArne Jansen 42565d13a37bSArne Jansen if (sa->create) { 425749a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 42585d13a37bSArne Jansen } else { 42593efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 42605d13a37bSArne Jansen } 42615d13a37bSArne Jansen 42623a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 42635d13a37bSArne Jansen if (err && !ret) 42645d13a37bSArne Jansen ret = err; 42655d13a37bSArne Jansen 42665d13a37bSArne Jansen out: 42675d13a37bSArne Jansen kfree(sa); 4268905b0ddaSMiao Xie drop_write: 4269905b0ddaSMiao Xie mnt_drop_write_file(file); 42705d13a37bSArne Jansen return ret; 42715d13a37bSArne Jansen } 42725d13a37bSArne Jansen 4273905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 42745d13a37bSArne Jansen { 42750b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42760b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42775d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 42785d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42795d13a37bSArne Jansen int ret; 42805d13a37bSArne Jansen int err; 42815d13a37bSArne Jansen u64 qgroupid; 42825d13a37bSArne Jansen 42835d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42845d13a37bSArne Jansen return -EPERM; 42855d13a37bSArne Jansen 4286905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4287905b0ddaSMiao Xie if (ret) 4288905b0ddaSMiao Xie return ret; 42895d13a37bSArne Jansen 42905d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4291905b0ddaSMiao Xie if (IS_ERR(sa)) { 4292905b0ddaSMiao Xie ret = PTR_ERR(sa); 4293905b0ddaSMiao Xie goto drop_write; 4294905b0ddaSMiao Xie } 42955d13a37bSArne Jansen 42965d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42975d13a37bSArne Jansen if (IS_ERR(trans)) { 42985d13a37bSArne Jansen ret = PTR_ERR(trans); 42995d13a37bSArne Jansen goto out; 43005d13a37bSArne Jansen } 43015d13a37bSArne Jansen 43025d13a37bSArne Jansen qgroupid = sa->qgroupid; 43035d13a37bSArne Jansen if (!qgroupid) { 43045d13a37bSArne Jansen /* take the current subvol as qgroup */ 43055d13a37bSArne Jansen qgroupid = root->root_key.objectid; 43065d13a37bSArne Jansen } 43075d13a37bSArne Jansen 4308f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 43095d13a37bSArne Jansen 43103a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 43115d13a37bSArne Jansen if (err && !ret) 43125d13a37bSArne Jansen ret = err; 43135d13a37bSArne Jansen 43145d13a37bSArne Jansen out: 43155d13a37bSArne Jansen kfree(sa); 4316905b0ddaSMiao Xie drop_write: 4317905b0ddaSMiao Xie mnt_drop_write_file(file); 43185d13a37bSArne Jansen return ret; 43195d13a37bSArne Jansen } 43205d13a37bSArne Jansen 43212f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 43222f232036SJan Schmidt { 43230b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43240b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 43252f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 43262f232036SJan Schmidt int ret; 43272f232036SJan Schmidt 43282f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 43292f232036SJan Schmidt return -EPERM; 43302f232036SJan Schmidt 43312f232036SJan Schmidt ret = mnt_want_write_file(file); 43322f232036SJan Schmidt if (ret) 43332f232036SJan Schmidt return ret; 43342f232036SJan Schmidt 43352f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 43362f232036SJan Schmidt if (IS_ERR(qsa)) { 43372f232036SJan Schmidt ret = PTR_ERR(qsa); 43382f232036SJan Schmidt goto drop_write; 43392f232036SJan Schmidt } 43402f232036SJan Schmidt 43412f232036SJan Schmidt if (qsa->flags) { 43422f232036SJan Schmidt ret = -EINVAL; 43432f232036SJan Schmidt goto out; 43442f232036SJan Schmidt } 43452f232036SJan Schmidt 43460b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 43472f232036SJan Schmidt 43482f232036SJan Schmidt out: 43492f232036SJan Schmidt kfree(qsa); 43502f232036SJan Schmidt drop_write: 43512f232036SJan Schmidt mnt_drop_write_file(file); 43522f232036SJan Schmidt return ret; 43532f232036SJan Schmidt } 43542f232036SJan Schmidt 4355b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4356b929c1d8SMarcos Paulo de Souza void __user *arg) 43572f232036SJan Schmidt { 43582f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 43592f232036SJan Schmidt int ret = 0; 43602f232036SJan Schmidt 43612f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 43622f232036SJan Schmidt return -EPERM; 43632f232036SJan Schmidt 43648d2db785SDavid Sterba qsa = kzalloc(sizeof(*qsa), GFP_KERNEL); 43652f232036SJan Schmidt if (!qsa) 43662f232036SJan Schmidt return -ENOMEM; 43672f232036SJan Schmidt 43680b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 43692f232036SJan Schmidt qsa->flags = 1; 43700b246afaSJeff Mahoney qsa->progress = fs_info->qgroup_rescan_progress.objectid; 43712f232036SJan Schmidt } 43722f232036SJan Schmidt 43732f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 43742f232036SJan Schmidt ret = -EFAULT; 43752f232036SJan Schmidt 43762f232036SJan Schmidt kfree(qsa); 43772f232036SJan Schmidt return ret; 43782f232036SJan Schmidt } 43792f232036SJan Schmidt 4380b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4381b929c1d8SMarcos Paulo de Souza void __user *arg) 438257254b6eSJan Schmidt { 438357254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 438457254b6eSJan Schmidt return -EPERM; 438557254b6eSJan Schmidt 43860b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 438757254b6eSJan Schmidt } 438857254b6eSJan Schmidt 4389abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4390abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 43918ea05e3aSAlexander Block { 4392496ad9aaSAl Viro struct inode *inode = file_inode(file); 43930b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 43948ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 43958ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 43968ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 439795582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 43988ea05e3aSAlexander Block int ret = 0; 4399dd5f9615SStefan Behrens int received_uuid_changed; 44008ea05e3aSAlexander Block 4401bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 4402bd60ea0fSDavid Sterba return -EPERM; 4403bd60ea0fSDavid Sterba 44048ea05e3aSAlexander Block ret = mnt_want_write_file(file); 44058ea05e3aSAlexander Block if (ret < 0) 44068ea05e3aSAlexander Block return ret; 44078ea05e3aSAlexander Block 44080b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 44098ea05e3aSAlexander Block 44104a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 44118ea05e3aSAlexander Block ret = -EINVAL; 44128ea05e3aSAlexander Block goto out; 44138ea05e3aSAlexander Block } 44148ea05e3aSAlexander Block 44158ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 44168ea05e3aSAlexander Block ret = -EROFS; 44178ea05e3aSAlexander Block goto out; 44188ea05e3aSAlexander Block } 44198ea05e3aSAlexander Block 4420dd5f9615SStefan Behrens /* 4421dd5f9615SStefan Behrens * 1 - root item 4422dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4423dd5f9615SStefan Behrens */ 4424dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 44258ea05e3aSAlexander Block if (IS_ERR(trans)) { 44268ea05e3aSAlexander Block ret = PTR_ERR(trans); 44278ea05e3aSAlexander Block trans = NULL; 44288ea05e3aSAlexander Block goto out; 44298ea05e3aSAlexander Block } 44308ea05e3aSAlexander Block 44318ea05e3aSAlexander Block sa->rtransid = trans->transid; 44328ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 44338ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 44348ea05e3aSAlexander Block 4435dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4436dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4437dd5f9615SStefan Behrens if (received_uuid_changed && 4438d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4439d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4440dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4441dd5f9615SStefan Behrens root->root_key.objectid); 4442d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4443d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4444d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4445d87ff758SNikolay Borisov goto out; 4446d87ff758SNikolay Borisov } 4447d87ff758SNikolay Borisov } 44488ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 44498ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 44508ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 44513cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 44523cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 44533cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 44543cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 44558ea05e3aSAlexander Block 44560b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 44578ea05e3aSAlexander Block &root->root_key, &root->root_item); 44588ea05e3aSAlexander Block if (ret < 0) { 44593a45bb20SJeff Mahoney btrfs_end_transaction(trans); 44608ea05e3aSAlexander Block goto out; 4461dd5f9615SStefan Behrens } 4462dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4463cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4464dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4465dd5f9615SStefan Behrens root->root_key.objectid); 4466dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 446766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4468efd38150SNikolay Borisov btrfs_end_transaction(trans); 4469dd5f9615SStefan Behrens goto out; 4470dd5f9615SStefan Behrens } 4471dd5f9615SStefan Behrens } 44723a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4473abccd00fSHugo Mills out: 44740b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4475abccd00fSHugo Mills mnt_drop_write_file(file); 4476abccd00fSHugo Mills return ret; 4477abccd00fSHugo Mills } 4478abccd00fSHugo Mills 4479abccd00fSHugo Mills #ifdef CONFIG_64BIT 4480abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4481abccd00fSHugo Mills void __user *arg) 4482abccd00fSHugo Mills { 4483abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4484abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4485abccd00fSHugo Mills int ret = 0; 4486abccd00fSHugo Mills 4487abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 44887b9ea627SShailendra Verma if (IS_ERR(args32)) 44897b9ea627SShailendra Verma return PTR_ERR(args32); 4490abccd00fSHugo Mills 44918d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 449284dbeb87SDan Carpenter if (!args64) { 449384dbeb87SDan Carpenter ret = -ENOMEM; 4494abccd00fSHugo Mills goto out; 4495abccd00fSHugo Mills } 4496abccd00fSHugo Mills 4497abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4498abccd00fSHugo Mills args64->stransid = args32->stransid; 4499abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4500abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4501abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4502abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4503abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4504abccd00fSHugo Mills args64->flags = args32->flags; 4505abccd00fSHugo Mills 4506abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4507abccd00fSHugo Mills if (ret) 4508abccd00fSHugo Mills goto out; 4509abccd00fSHugo Mills 4510abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4511abccd00fSHugo Mills args32->stransid = args64->stransid; 4512abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4513abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4514abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4515abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4516abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4517abccd00fSHugo Mills args32->flags = args64->flags; 4518abccd00fSHugo Mills 4519abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4520abccd00fSHugo Mills if (ret) 4521abccd00fSHugo Mills ret = -EFAULT; 4522abccd00fSHugo Mills 4523abccd00fSHugo Mills out: 4524abccd00fSHugo Mills kfree(args32); 4525abccd00fSHugo Mills kfree(args64); 4526abccd00fSHugo Mills return ret; 4527abccd00fSHugo Mills } 4528abccd00fSHugo Mills #endif 4529abccd00fSHugo Mills 4530abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4531abccd00fSHugo Mills void __user *arg) 4532abccd00fSHugo Mills { 4533abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4534abccd00fSHugo Mills int ret = 0; 4535abccd00fSHugo Mills 4536abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 45377b9ea627SShailendra Verma if (IS_ERR(sa)) 45387b9ea627SShailendra Verma return PTR_ERR(sa); 4539abccd00fSHugo Mills 4540abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4541abccd00fSHugo Mills 4542abccd00fSHugo Mills if (ret) 4543abccd00fSHugo Mills goto out; 4544abccd00fSHugo Mills 45458ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 45468ea05e3aSAlexander Block if (ret) 45478ea05e3aSAlexander Block ret = -EFAULT; 45488ea05e3aSAlexander Block 45498ea05e3aSAlexander Block out: 45508ea05e3aSAlexander Block kfree(sa); 45518ea05e3aSAlexander Block return ret; 45528ea05e3aSAlexander Block } 45538ea05e3aSAlexander Block 4554b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4555b929c1d8SMarcos Paulo de Souza void __user *arg) 4556867ab667Sjeff.liu { 4557a1b83ac5SAnand Jain size_t len; 4558867ab667Sjeff.liu int ret; 4559a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4560a1b83ac5SAnand Jain 45610b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 45620b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 45630b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4564a1b83ac5SAnand Jain 4565a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4566867ab667Sjeff.liu 4567867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 45680b246afaSJeff Mahoney btrfs_warn(fs_info, 45690b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 45700b246afaSJeff Mahoney --len); 4571867ab667Sjeff.liu } 4572867ab667Sjeff.liu 4573867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4574867ab667Sjeff.liu 4575867ab667Sjeff.liu return ret ? -EFAULT : 0; 4576867ab667Sjeff.liu } 4577867ab667Sjeff.liu 4578a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4579a8bfd4abSjeff.liu { 45800b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45810b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45820b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 45830b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4584a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4585a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4586a8bfd4abSjeff.liu int ret; 4587a8bfd4abSjeff.liu 4588a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4589a8bfd4abSjeff.liu return -EPERM; 4590a8bfd4abSjeff.liu 4591a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4592a8bfd4abSjeff.liu return -EFAULT; 4593a8bfd4abSjeff.liu 4594a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 45950b246afaSJeff Mahoney btrfs_err(fs_info, 45965d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4597a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4598a8bfd4abSjeff.liu return -EINVAL; 4599a8bfd4abSjeff.liu } 4600a8bfd4abSjeff.liu 4601a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4602a8bfd4abSjeff.liu if (ret) 4603a8bfd4abSjeff.liu return ret; 4604a8bfd4abSjeff.liu 4605a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4606a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4607a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4608a8bfd4abSjeff.liu goto out_unlock; 4609a8bfd4abSjeff.liu } 4610a8bfd4abSjeff.liu 46110b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4612a8bfd4abSjeff.liu strcpy(super_block->label, label); 46130b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 46143a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4615a8bfd4abSjeff.liu 4616a8bfd4abSjeff.liu out_unlock: 4617a8bfd4abSjeff.liu mnt_drop_write_file(file); 4618a8bfd4abSjeff.liu return ret; 4619a8bfd4abSjeff.liu } 4620a8bfd4abSjeff.liu 46212eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 46222eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 46232eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 46242eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 46252eaa055fSJeff Mahoney 4626d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 46272eaa055fSJeff Mahoney { 46284d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 46292eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 46302eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 46312eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 46322eaa055fSJeff Mahoney }; 46332eaa055fSJeff Mahoney 46342eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 46352eaa055fSJeff Mahoney return -EFAULT; 46362eaa055fSJeff Mahoney 46372eaa055fSJeff Mahoney return 0; 46382eaa055fSJeff Mahoney } 46392eaa055fSJeff Mahoney 4640b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4641b929c1d8SMarcos Paulo de Souza void __user *arg) 46422eaa055fSJeff Mahoney { 46430b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 46442eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 46452eaa055fSJeff Mahoney 46462eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 46472eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 46482eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 46492eaa055fSJeff Mahoney 46502eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 46512eaa055fSJeff Mahoney return -EFAULT; 46522eaa055fSJeff Mahoney 46532eaa055fSJeff Mahoney return 0; 46542eaa055fSJeff Mahoney } 46552eaa055fSJeff Mahoney 46562ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 46573b02a68aSJeff Mahoney enum btrfs_feature_set set, 46582eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 46592eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 46602eaa055fSJeff Mahoney { 4661f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 46623b02a68aSJeff Mahoney char *names; 46632eaa055fSJeff Mahoney u64 disallowed, unsupported; 46642eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 46652eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 46662eaa055fSJeff Mahoney 46672eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 46682eaa055fSJeff Mahoney if (unsupported) { 46693b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 46703b02a68aSJeff Mahoney if (names) { 46710b246afaSJeff Mahoney btrfs_warn(fs_info, 46723b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 46733b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46743b02a68aSJeff Mahoney kfree(names); 46753b02a68aSJeff Mahoney } else 46760b246afaSJeff Mahoney btrfs_warn(fs_info, 46772eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 46782eaa055fSJeff Mahoney type, unsupported); 46792eaa055fSJeff Mahoney return -EOPNOTSUPP; 46802eaa055fSJeff Mahoney } 46812eaa055fSJeff Mahoney 46822eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 46832eaa055fSJeff Mahoney if (disallowed) { 46843b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 46853b02a68aSJeff Mahoney if (names) { 46860b246afaSJeff Mahoney btrfs_warn(fs_info, 46873b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 46883b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46893b02a68aSJeff Mahoney kfree(names); 46903b02a68aSJeff Mahoney } else 46910b246afaSJeff Mahoney btrfs_warn(fs_info, 46922eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 46932eaa055fSJeff Mahoney type, disallowed); 46942eaa055fSJeff Mahoney return -EPERM; 46952eaa055fSJeff Mahoney } 46962eaa055fSJeff Mahoney 46972eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 46982eaa055fSJeff Mahoney if (disallowed) { 46993b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47003b02a68aSJeff Mahoney if (names) { 47010b246afaSJeff Mahoney btrfs_warn(fs_info, 47023b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 47033b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47043b02a68aSJeff Mahoney kfree(names); 47053b02a68aSJeff Mahoney } else 47060b246afaSJeff Mahoney btrfs_warn(fs_info, 47072eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 47082eaa055fSJeff Mahoney type, disallowed); 47092eaa055fSJeff Mahoney return -EPERM; 47102eaa055fSJeff Mahoney } 47112eaa055fSJeff Mahoney 47122eaa055fSJeff Mahoney return 0; 47132eaa055fSJeff Mahoney } 47142eaa055fSJeff Mahoney 47152ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 47162ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 47172eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 47182eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 47192eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 47202eaa055fSJeff Mahoney 47212eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 47222eaa055fSJeff Mahoney { 47230b246afaSJeff Mahoney struct inode *inode = file_inode(file); 47240b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 47250b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 47260b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 47272eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 47282eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 47292eaa055fSJeff Mahoney u64 newflags; 47302eaa055fSJeff Mahoney int ret; 47312eaa055fSJeff Mahoney 47322eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 47332eaa055fSJeff Mahoney return -EPERM; 47342eaa055fSJeff Mahoney 47352eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 47362eaa055fSJeff Mahoney return -EFAULT; 47372eaa055fSJeff Mahoney 47382eaa055fSJeff Mahoney /* Nothing to do */ 47392eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 47402eaa055fSJeff Mahoney !flags[0].incompat_flags) 47412eaa055fSJeff Mahoney return 0; 47422eaa055fSJeff Mahoney 47432ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 47442eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 47452eaa055fSJeff Mahoney if (ret) 47462eaa055fSJeff Mahoney return ret; 47472eaa055fSJeff Mahoney 47482ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 47492eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 47502eaa055fSJeff Mahoney if (ret) 47512eaa055fSJeff Mahoney return ret; 47522eaa055fSJeff Mahoney 47532ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 47542eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 47552eaa055fSJeff Mahoney if (ret) 47562eaa055fSJeff Mahoney return ret; 47572eaa055fSJeff Mahoney 47587ab19625SDavid Sterba ret = mnt_want_write_file(file); 47597ab19625SDavid Sterba if (ret) 47607ab19625SDavid Sterba return ret; 47617ab19625SDavid Sterba 47628051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 47637ab19625SDavid Sterba if (IS_ERR(trans)) { 47647ab19625SDavid Sterba ret = PTR_ERR(trans); 47657ab19625SDavid Sterba goto out_drop_write; 47667ab19625SDavid Sterba } 47672eaa055fSJeff Mahoney 47680b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 47692eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 47702eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 47712eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 47722eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 47732eaa055fSJeff Mahoney 47742eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 47752eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 47762eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 47772eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 47782eaa055fSJeff Mahoney 47792eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 47802eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 47812eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 47822eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 47830b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 47842eaa055fSJeff Mahoney 47853a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 47867ab19625SDavid Sterba out_drop_write: 47877ab19625SDavid Sterba mnt_drop_write_file(file); 47887ab19625SDavid Sterba 47897ab19625SDavid Sterba return ret; 47902eaa055fSJeff Mahoney } 47912eaa055fSJeff Mahoney 47922351f431SJosef Bacik static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) 47932351f431SJosef Bacik { 47942351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 47952351f431SJosef Bacik int ret; 47962351f431SJosef Bacik 47972351f431SJosef Bacik if (compat) { 47982351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 47992351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 48002351f431SJosef Bacik 48012351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 48022351f431SJosef Bacik if (ret) 48032351f431SJosef Bacik return -EFAULT; 48042351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 48052351f431SJosef Bacik if (!arg) 48062351f431SJosef Bacik return -ENOMEM; 48072351f431SJosef Bacik arg->send_fd = args32.send_fd; 48082351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 48092351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 48102351f431SJosef Bacik arg->parent_root = args32.parent_root; 48112351f431SJosef Bacik arg->flags = args32.flags; 48122351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 48132351f431SJosef Bacik sizeof(args32.reserved)); 48142351f431SJosef Bacik #else 48152351f431SJosef Bacik return -ENOTTY; 48162351f431SJosef Bacik #endif 48172351f431SJosef Bacik } else { 48182351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 48192351f431SJosef Bacik if (IS_ERR(arg)) 48202351f431SJosef Bacik return PTR_ERR(arg); 48212351f431SJosef Bacik } 48222351f431SJosef Bacik ret = btrfs_ioctl_send(file, arg); 48232351f431SJosef Bacik kfree(arg); 48242351f431SJosef Bacik return ret; 48252351f431SJosef Bacik } 48262351f431SJosef Bacik 4827f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4828f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4829f46b5a66SChristoph Hellwig { 48300b246afaSJeff Mahoney struct inode *inode = file_inode(file); 48310b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 48320b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 48334bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4834f46b5a66SChristoph Hellwig 4835f46b5a66SChristoph Hellwig switch (cmd) { 48366cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 48376cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 48386cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 48396cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 48406cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 48416cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 484240cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4843b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 484440cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 484540cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4846f7039b1dSLi Dongyang case FITRIM: 4847b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4848f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4849fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4850fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4851fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 48523de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4853fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 48546f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 48556f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 485676dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4857949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4858949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4859949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 48600caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 48610caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 48620caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 48630caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 48646ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 48656ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4866f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 48671e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 48681e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 48691e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4870f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4871198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4872f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 48732ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 4874f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4875da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 48766b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 48776b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 4878475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 48792ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 4880475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 48812ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 4882f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 48839ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4884ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4885ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4886cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 4887cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 4888ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4889ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4890d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4891d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4892d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4893d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 4894d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 4895d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 48961406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 48972ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 48989b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 48999b199859SFilipe David Borba Manana int ret; 49009b199859SFilipe David Borba Manana 4901b4912139SJosef Bacik ret = btrfs_start_delalloc_roots(fs_info, U64_MAX); 49029b199859SFilipe David Borba Manana if (ret) 49039b199859SFilipe David Borba Manana return ret; 49040b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 49052fad4e83SDavid Sterba /* 49062fad4e83SDavid Sterba * The transaction thread may want to do more work, 490701327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 49082fad4e83SDavid Sterba * processing uncleaned subvols. 49092fad4e83SDavid Sterba */ 49100b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 49119b199859SFilipe David Borba Manana return ret; 49129b199859SFilipe David Borba Manana } 491346204592SSage Weil case BTRFS_IOC_START_SYNC: 49149a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 491546204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 49162ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 4917475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4918b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4919475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 49202ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 4921475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 49222ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 4923c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 49249ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4925837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 49262ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 492719a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 49282ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 49298ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 49308ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 4931abccd00fSHugo Mills #ifdef CONFIG_64BIT 4932abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 4933abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 4934abccd00fSHugo Mills #endif 493531db9f7cSAlexander Block case BTRFS_IOC_SEND: 49362351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, false); 49372351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 49382351f431SJosef Bacik case BTRFS_IOC_SEND_32: 49392351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, true); 49402351f431SJosef Bacik #endif 4941c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 49422ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 49435d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4944905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 49455d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4946905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 49475d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4948905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 49495d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4950905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 49512f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 49522f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 49532f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 4954b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 495557254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 4956b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 49573f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 49582ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 49592eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 4960d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 49612eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 4962b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 49632eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 49642eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 4965e4202ac9SDavid Sterba case FS_IOC_FSGETXATTR: 4966e4202ac9SDavid Sterba return btrfs_ioctl_fsgetxattr(file, argp); 4967025f2121SDavid Sterba case FS_IOC_FSSETXATTR: 4968025f2121SDavid Sterba return btrfs_ioctl_fssetxattr(file, argp); 4969b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 4970b64ec075STomohiro Misono return btrfs_ioctl_get_subvol_info(file, argp); 497142e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 497242e4b520STomohiro Misono return btrfs_ioctl_get_subvol_rootref(file, argp); 497323d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 497423d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 4975f46b5a66SChristoph Hellwig } 4976f46b5a66SChristoph Hellwig 4977f46b5a66SChristoph Hellwig return -ENOTTY; 4978f46b5a66SChristoph Hellwig } 49794c63c245SLuke Dashjr 49804c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 49814c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 49824c63c245SLuke Dashjr { 49832a362249SJeff Mahoney /* 49842a362249SJeff Mahoney * These all access 32-bit values anyway so no further 49852a362249SJeff Mahoney * handling is necessary. 49862a362249SJeff Mahoney */ 49874c63c245SLuke Dashjr switch (cmd) { 49884c63c245SLuke Dashjr case FS_IOC32_GETFLAGS: 49894c63c245SLuke Dashjr cmd = FS_IOC_GETFLAGS; 49904c63c245SLuke Dashjr break; 49914c63c245SLuke Dashjr case FS_IOC32_SETFLAGS: 49924c63c245SLuke Dashjr cmd = FS_IOC_SETFLAGS; 49934c63c245SLuke Dashjr break; 49944c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 49954c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 49964c63c245SLuke Dashjr break; 49974c63c245SLuke Dashjr } 49984c63c245SLuke Dashjr 49994c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 50004c63c245SLuke Dashjr } 50014c63c245SLuke Dashjr #endif 5002