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 381c3e1f96cSGoldwyn Rodrigues bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, 382c3e1f96cSGoldwyn Rodrigues enum btrfs_exclusive_operation type) 383c3e1f96cSGoldwyn Rodrigues { 384c3e1f96cSGoldwyn Rodrigues return !cmpxchg(&fs_info->exclusive_operation, BTRFS_EXCLOP_NONE, type); 385c3e1f96cSGoldwyn Rodrigues } 386c3e1f96cSGoldwyn Rodrigues 387c3e1f96cSGoldwyn Rodrigues void btrfs_exclop_finish(struct btrfs_fs_info *fs_info) 388c3e1f96cSGoldwyn Rodrigues { 389c3e1f96cSGoldwyn Rodrigues WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE); 39066a2823cSGoldwyn Rodrigues sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation"); 391c3e1f96cSGoldwyn Rodrigues } 392c3e1f96cSGoldwyn Rodrigues 393e4202ac9SDavid Sterba /* 394e4202ac9SDavid Sterba * Set the xflags from the internal inode flags. The remaining items of fsxattr 395e4202ac9SDavid Sterba * are zeroed. 396e4202ac9SDavid Sterba */ 397e4202ac9SDavid Sterba static int btrfs_ioctl_fsgetxattr(struct file *file, void __user *arg) 398e4202ac9SDavid Sterba { 399e4202ac9SDavid Sterba struct btrfs_inode *binode = BTRFS_I(file_inode(file)); 400e4202ac9SDavid Sterba struct fsxattr fa; 401e4202ac9SDavid Sterba 4027b0e492eSDarrick J. Wong simple_fill_fsxattr(&fa, btrfs_inode_flags_to_xflags(binode->flags)); 403e4202ac9SDavid Sterba if (copy_to_user(arg, &fa, sizeof(fa))) 404e4202ac9SDavid Sterba return -EFAULT; 405e4202ac9SDavid Sterba 406e4202ac9SDavid Sterba return 0; 407e4202ac9SDavid Sterba } 408e4202ac9SDavid Sterba 409025f2121SDavid Sterba static int btrfs_ioctl_fssetxattr(struct file *file, void __user *arg) 410025f2121SDavid Sterba { 411025f2121SDavid Sterba struct inode *inode = file_inode(file); 412025f2121SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 413025f2121SDavid Sterba struct btrfs_root *root = binode->root; 414025f2121SDavid Sterba struct btrfs_trans_handle *trans; 4157b0e492eSDarrick J. Wong struct fsxattr fa, old_fa; 416025f2121SDavid Sterba unsigned old_flags; 417025f2121SDavid Sterba unsigned old_i_flags; 418025f2121SDavid Sterba int ret = 0; 419025f2121SDavid Sterba 420025f2121SDavid Sterba if (!inode_owner_or_capable(inode)) 421025f2121SDavid Sterba return -EPERM; 422025f2121SDavid Sterba 423025f2121SDavid Sterba if (btrfs_root_readonly(root)) 424025f2121SDavid Sterba return -EROFS; 425025f2121SDavid Sterba 426025f2121SDavid Sterba if (copy_from_user(&fa, arg, sizeof(fa))) 427025f2121SDavid Sterba return -EFAULT; 428025f2121SDavid Sterba 429025f2121SDavid Sterba ret = check_xflags(fa.fsx_xflags); 430025f2121SDavid Sterba if (ret) 431025f2121SDavid Sterba return ret; 432025f2121SDavid Sterba 433025f2121SDavid Sterba if (fa.fsx_extsize != 0 || fa.fsx_projid != 0 || fa.fsx_cowextsize != 0) 434025f2121SDavid Sterba return -EOPNOTSUPP; 435025f2121SDavid Sterba 436025f2121SDavid Sterba ret = mnt_want_write_file(file); 437025f2121SDavid Sterba if (ret) 438025f2121SDavid Sterba return ret; 439025f2121SDavid Sterba 440025f2121SDavid Sterba inode_lock(inode); 441025f2121SDavid Sterba 442025f2121SDavid Sterba old_flags = binode->flags; 443025f2121SDavid Sterba old_i_flags = inode->i_flags; 444025f2121SDavid Sterba 4457b0e492eSDarrick J. Wong simple_fill_fsxattr(&old_fa, 4467b0e492eSDarrick J. Wong btrfs_inode_flags_to_xflags(binode->flags)); 4477b0e492eSDarrick J. Wong ret = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa); 4487b0e492eSDarrick J. Wong if (ret) 449025f2121SDavid Sterba goto out_unlock; 450025f2121SDavid Sterba 451025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_SYNC) 452025f2121SDavid Sterba binode->flags |= BTRFS_INODE_SYNC; 453025f2121SDavid Sterba else 454025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_SYNC; 455025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_IMMUTABLE) 456025f2121SDavid Sterba binode->flags |= BTRFS_INODE_IMMUTABLE; 457025f2121SDavid Sterba else 458025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_IMMUTABLE; 459025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_APPEND) 460025f2121SDavid Sterba binode->flags |= BTRFS_INODE_APPEND; 461025f2121SDavid Sterba else 462025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_APPEND; 463025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_NODUMP) 464025f2121SDavid Sterba binode->flags |= BTRFS_INODE_NODUMP; 465025f2121SDavid Sterba else 466025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_NODUMP; 467025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_NOATIME) 468025f2121SDavid Sterba binode->flags |= BTRFS_INODE_NOATIME; 469025f2121SDavid Sterba else 470025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_NOATIME; 471025f2121SDavid Sterba 472025f2121SDavid Sterba /* 1 item for the inode */ 473025f2121SDavid Sterba trans = btrfs_start_transaction(root, 1); 474025f2121SDavid Sterba if (IS_ERR(trans)) { 475025f2121SDavid Sterba ret = PTR_ERR(trans); 476025f2121SDavid Sterba goto out_unlock; 477025f2121SDavid Sterba } 478025f2121SDavid Sterba 479025f2121SDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 480025f2121SDavid Sterba inode_inc_iversion(inode); 481025f2121SDavid Sterba inode->i_ctime = current_time(inode); 482025f2121SDavid Sterba ret = btrfs_update_inode(trans, root, inode); 483025f2121SDavid Sterba 484025f2121SDavid Sterba btrfs_end_transaction(trans); 485025f2121SDavid Sterba 486025f2121SDavid Sterba out_unlock: 487025f2121SDavid Sterba if (ret) { 488025f2121SDavid Sterba binode->flags = old_flags; 489025f2121SDavid Sterba inode->i_flags = old_i_flags; 490025f2121SDavid Sterba } 491025f2121SDavid Sterba 492025f2121SDavid Sterba inode_unlock(inode); 493025f2121SDavid Sterba mnt_drop_write_file(file); 494025f2121SDavid Sterba 495025f2121SDavid Sterba return ret; 496025f2121SDavid Sterba } 497025f2121SDavid Sterba 4986cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 4996cbff00fSChristoph Hellwig { 500496ad9aaSAl Viro struct inode *inode = file_inode(file); 5016cbff00fSChristoph Hellwig 5026cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 5036cbff00fSChristoph Hellwig } 504f46b5a66SChristoph Hellwig 505b929c1d8SMarcos Paulo de Souza static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, 506b929c1d8SMarcos Paulo de Souza void __user *arg) 507f7039b1dSLi Dongyang { 508f7039b1dSLi Dongyang struct btrfs_device *device; 509f7039b1dSLi Dongyang struct request_queue *q; 510f7039b1dSLi Dongyang struct fstrim_range range; 511f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 512f7039b1dSLi Dongyang u64 num_devices = 0; 513f7039b1dSLi Dongyang int ret; 514f7039b1dSLi Dongyang 515f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 516f7039b1dSLi Dongyang return -EPERM; 517f7039b1dSLi Dongyang 518f35f06c3SFilipe Manana /* 519f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 520f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 521f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 522f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 523f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 524f35f06c3SFilipe Manana */ 525f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 526f35f06c3SFilipe Manana return -EROFS; 527f35f06c3SFilipe Manana 5281f78160cSXiao Guangrong rcu_read_lock(); 5291f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 5301f78160cSXiao Guangrong dev_list) { 531f7039b1dSLi Dongyang if (!device->bdev) 532f7039b1dSLi Dongyang continue; 533f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 534f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 535f7039b1dSLi Dongyang num_devices++; 53650d0446eSSeraphime Kirkovski minlen = min_t(u64, q->limits.discard_granularity, 537f7039b1dSLi Dongyang minlen); 538f7039b1dSLi Dongyang } 539f7039b1dSLi Dongyang } 5401f78160cSXiao Guangrong rcu_read_unlock(); 541f4c697e6SLukas Czerner 542f7039b1dSLi Dongyang if (!num_devices) 543f7039b1dSLi Dongyang return -EOPNOTSUPP; 544f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 545f7039b1dSLi Dongyang return -EFAULT; 5466ba9fc8eSQu Wenruo 5476ba9fc8eSQu Wenruo /* 5486ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 5496ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 5506ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 5516ba9fc8eSQu Wenruo */ 5526ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 553f4c697e6SLukas Czerner return -EINVAL; 554f7039b1dSLi Dongyang 555f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 5562ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 557f7039b1dSLi Dongyang if (ret < 0) 558f7039b1dSLi Dongyang return ret; 559f7039b1dSLi Dongyang 560f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 561f7039b1dSLi Dongyang return -EFAULT; 562f7039b1dSLi Dongyang 563f7039b1dSLi Dongyang return 0; 564f7039b1dSLi Dongyang } 565f7039b1dSLi Dongyang 566e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 567dd5f9615SStefan Behrens { 56846e0f66aSChris Mason int i; 56946e0f66aSChris Mason 57046e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 57146e0f66aSChris Mason if (uuid[i]) 57246e0f66aSChris Mason return 0; 57346e0f66aSChris Mason } 57446e0f66aSChris Mason return 1; 575dd5f9615SStefan Behrens } 576dd5f9615SStefan Behrens 577d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 578cb8e7090SChristoph Hellwig struct dentry *dentry, 57952f75f4fSDavid Sterba const char *name, int namelen, 5808696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 581f46b5a66SChristoph Hellwig { 5820b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 583f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 584f46b5a66SChristoph Hellwig struct btrfs_key key; 58549a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 586f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 587f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 588d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 58976dda93cSYan, Zheng struct btrfs_root *new_root; 590d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 59195582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 5925662344bSTsutomu Itoh struct inode *inode; 593f46b5a66SChristoph Hellwig int ret; 594f46b5a66SChristoph Hellwig int err; 5952dfb1e43SQu Wenruo dev_t anon_dev = 0; 596f46b5a66SChristoph Hellwig u64 objectid; 597f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 5983de4586cSChris Mason u64 index = 0; 599f46b5a66SChristoph Hellwig 60049a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 60149a3c4d9SDavid Sterba if (!root_item) 60249a3c4d9SDavid Sterba return -ENOMEM; 60349a3c4d9SDavid Sterba 6040b246afaSJeff Mahoney ret = btrfs_find_free_objectid(fs_info->tree_root, &objectid); 6052fbe8c8aSAl Viro if (ret) 60649a3c4d9SDavid Sterba goto fail_free; 6076a912213SJosef Bacik 6082dfb1e43SQu Wenruo ret = get_anon_bdev(&anon_dev); 6092dfb1e43SQu Wenruo if (ret < 0) 6102dfb1e43SQu Wenruo goto fail_free; 6112dfb1e43SQu Wenruo 612e09fe2d2SQu Wenruo /* 613e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 61401327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 615e09fe2d2SQu Wenruo */ 61649a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 61749a3c4d9SDavid Sterba ret = -ENOSPC; 61849a3c4d9SDavid Sterba goto fail_free; 61949a3c4d9SDavid Sterba } 620e09fe2d2SQu Wenruo 621d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 6229ed74f2dSJosef Bacik /* 623d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 624d5c12070SMiao Xie * of create_snapshot(). 6259ed74f2dSJosef Bacik */ 626c4c129dbSGu JinXiang ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false); 627d5c12070SMiao Xie if (ret) 62849a3c4d9SDavid Sterba goto fail_free; 629f46b5a66SChristoph Hellwig 630d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 631d5c12070SMiao Xie if (IS_ERR(trans)) { 632d5c12070SMiao Xie ret = PTR_ERR(trans); 633e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 63449a3c4d9SDavid Sterba goto fail_free; 635d5c12070SMiao Xie } 636d5c12070SMiao Xie trans->block_rsv = &block_rsv; 637d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 638f46b5a66SChristoph Hellwig 639a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 6406f72c7e2SArne Jansen if (ret) 6416f72c7e2SArne Jansen goto fail; 6426f72c7e2SArne Jansen 6439631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 6449631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 6458e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 6468e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 6478e8a1e31SJosef Bacik goto fail; 6488e8a1e31SJosef Bacik } 649f46b5a66SChristoph Hellwig 650f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 651f46b5a66SChristoph Hellwig 65249a3c4d9SDavid Sterba inode_item = &root_item->inode; 6533cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6543cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6553cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 656da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6570b246afaSJeff Mahoney fs_info->nodesize); 6583cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 659f46b5a66SChristoph Hellwig 66049a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 66149a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6623cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 66308fe4db1SLi Zefan 66449a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 66549a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 66649a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 66749a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 66849a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 66949a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 670f46b5a66SChristoph Hellwig 67149a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 67249a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 673807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 67449a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 67549a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 67649a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 67749a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 67849a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 679f46b5a66SChristoph Hellwig 680925baeddSChris Mason btrfs_tree_unlock(leaf); 681f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 682f46b5a66SChristoph Hellwig leaf = NULL; 683f46b5a66SChristoph Hellwig 68449a3c4d9SDavid Sterba btrfs_set_root_dirid(root_item, new_dirid); 685f46b5a66SChristoph Hellwig 686f46b5a66SChristoph Hellwig key.objectid = objectid; 6875d4f98a2SYan Zheng key.offset = 0; 688962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 6890b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 69049a3c4d9SDavid Sterba root_item); 691f46b5a66SChristoph Hellwig if (ret) 692f46b5a66SChristoph Hellwig goto fail; 693f46b5a66SChristoph Hellwig 69476dda93cSYan, Zheng key.offset = (u64)-1; 6952dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 69679787eaaSJeff Mahoney if (IS_ERR(new_root)) { 6972dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 69879787eaaSJeff Mahoney ret = PTR_ERR(new_root); 69966642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 70079787eaaSJeff Mahoney goto fail; 70179787eaaSJeff Mahoney } 7022dfb1e43SQu Wenruo /* Freeing will be done in btrfs_put_root() of new_root */ 7032dfb1e43SQu Wenruo anon_dev = 0; 70476dda93cSYan, Zheng 70576dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 70676dda93cSYan, Zheng 70763541927SFilipe David Borba Manana ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); 70800246528SJosef Bacik btrfs_put_root(new_root); 709ce598979SMark Fasheh if (ret) { 710ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 71166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 712ce598979SMark Fasheh goto fail; 713ce598979SMark Fasheh } 714ce598979SMark Fasheh 715f32e48e9SChandan Rajendra mutex_lock(&new_root->objectid_mutex); 716f32e48e9SChandan Rajendra new_root->highest_objectid = new_dirid; 717f32e48e9SChandan Rajendra mutex_unlock(&new_root->objectid_mutex); 718f32e48e9SChandan Rajendra 719f46b5a66SChristoph Hellwig /* 720f46b5a66SChristoph Hellwig * insert the directory item 721f46b5a66SChristoph Hellwig */ 722877574e2SNikolay Borisov ret = btrfs_set_inode_index(BTRFS_I(dir), &index); 72379787eaaSJeff Mahoney if (ret) { 72466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 72579787eaaSJeff Mahoney goto fail; 72679787eaaSJeff Mahoney } 7273de4586cSChris Mason 728684572dfSLu Fengqi ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key, 7293de4586cSChris Mason BTRFS_FT_DIR, index); 73079787eaaSJeff Mahoney if (ret) { 73166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 732f46b5a66SChristoph Hellwig goto fail; 73379787eaaSJeff Mahoney } 7340660b5afSChris Mason 7356ef06d27SNikolay Borisov btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); 73652c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 737c7e54b51SJosef Bacik if (ret) { 738c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 739c7e54b51SJosef Bacik goto fail; 740c7e54b51SJosef Bacik } 74152c26179SYan Zheng 7426025c19fSLu Fengqi ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid, 7434a0cc7caSNikolay Borisov btrfs_ino(BTRFS_I(dir)), index, name, namelen); 744c7e54b51SJosef Bacik if (ret) { 745c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 746c7e54b51SJosef Bacik goto fail; 747c7e54b51SJosef Bacik } 7480660b5afSChris Mason 749cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7506bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 751dd5f9615SStefan Behrens if (ret) 75266642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 753dd5f9615SStefan Behrens 754f46b5a66SChristoph Hellwig fail: 75549a3c4d9SDavid Sterba kfree(root_item); 756d5c12070SMiao Xie trans->block_rsv = NULL; 757d5c12070SMiao Xie trans->bytes_reserved = 0; 758e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 759de6e8200SLiu Bo 7603a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 761f46b5a66SChristoph Hellwig if (err && !ret) 762f46b5a66SChristoph Hellwig ret = err; 7631a65e24bSChris Mason 7645662344bSTsutomu Itoh if (!ret) { 7655662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 766de6e8200SLiu Bo if (IS_ERR(inode)) 767de6e8200SLiu Bo return PTR_ERR(inode); 7685662344bSTsutomu Itoh d_instantiate(dentry, inode); 7695662344bSTsutomu Itoh } 770f46b5a66SChristoph Hellwig return ret; 77149a3c4d9SDavid Sterba 77249a3c4d9SDavid Sterba fail_free: 7732dfb1e43SQu Wenruo if (anon_dev) 7742dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 77549a3c4d9SDavid Sterba kfree(root_item); 77649a3c4d9SDavid Sterba return ret; 777f46b5a66SChristoph Hellwig } 778f46b5a66SChristoph Hellwig 779e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7809babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 781e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 782f46b5a66SChristoph Hellwig { 7830b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7842e4bfab9SYan, Zheng struct inode *inode; 785f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 786f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7872e4bfab9SYan, Zheng int ret; 788f46b5a66SChristoph Hellwig 78992a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 790f46b5a66SChristoph Hellwig return -EINVAL; 791f46b5a66SChristoph Hellwig 792eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 793eede2bf3SOmar Sandoval btrfs_warn(fs_info, 794eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 795eede2bf3SOmar Sandoval return -ETXTBSY; 796eede2bf3SOmar Sandoval } 797eede2bf3SOmar Sandoval 79823269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 799a1ee7362SDavid Sterba if (!pending_snapshot) 800a1ee7362SDavid Sterba return -ENOMEM; 801a1ee7362SDavid Sterba 8022dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 8032dfb1e43SQu Wenruo if (ret < 0) 8042dfb1e43SQu Wenruo goto free_pending; 805b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 80623269bf5SDavid Sterba GFP_KERNEL); 8078546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 8088546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 809b0c0ea63SDavid Sterba ret = -ENOMEM; 810b0c0ea63SDavid Sterba goto free_pending; 811b0c0ea63SDavid Sterba } 812b0c0ea63SDavid Sterba 81366d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 81466d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 815d5c12070SMiao Xie /* 816d5c12070SMiao Xie * 1 - parent dir inode 817d5c12070SMiao Xie * 2 - dir entries 818d5c12070SMiao Xie * 1 - root item 819d5c12070SMiao Xie * 2 - root ref/backref 820d5c12070SMiao Xie * 1 - root of snapshot 821dd5f9615SStefan Behrens * 1 - UUID item 822d5c12070SMiao Xie */ 823d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 824dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 825ee3441b4SJeff Mahoney false); 826d5c12070SMiao Xie if (ret) 827c11fbb6eSRobbie Ko goto free_pending; 828d5c12070SMiao Xie 829a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 830a22285a6SYan, Zheng pending_snapshot->root = root; 831b83cc969SLi Zefan pending_snapshot->readonly = readonly; 832e9662f70SMiao Xie pending_snapshot->dir = dir; 8338696c533SMiao Xie pending_snapshot->inherit = inherit; 834a22285a6SYan, Zheng 835d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 836a22285a6SYan, Zheng if (IS_ERR(trans)) { 837a22285a6SYan, Zheng ret = PTR_ERR(trans); 838a22285a6SYan, Zheng goto fail; 839a22285a6SYan, Zheng } 840a22285a6SYan, Zheng 8410b246afaSJeff Mahoney spin_lock(&fs_info->trans_lock); 842a22285a6SYan, Zheng list_add(&pending_snapshot->list, 843a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 8440b246afaSJeff Mahoney spin_unlock(&fs_info->trans_lock); 8459babda9fSNikolay Borisov 8463a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 847aec8030aSMiao Xie if (ret) 848c37b2b62SJosef Bacik goto fail; 849a22285a6SYan, Zheng 850a22285a6SYan, Zheng ret = pending_snapshot->error; 851f46b5a66SChristoph Hellwig if (ret) 8522e4bfab9SYan, Zheng goto fail; 853f46b5a66SChristoph Hellwig 854d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 855d3797308SChris Mason if (ret) 856d3797308SChris Mason goto fail; 857d3797308SChris Mason 8582b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8592e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8602e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8612e4bfab9SYan, Zheng goto fail; 8622e4bfab9SYan, Zheng } 8635662344bSTsutomu Itoh 8642e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8652e4bfab9SYan, Zheng ret = 0; 8662dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8672e4bfab9SYan, Zheng fail: 8682dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 8692dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8702dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 87100246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 872e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 873b0c0ea63SDavid Sterba free_pending: 8742dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8752dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 876b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8778546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 878a1ee7362SDavid Sterba kfree(pending_snapshot); 879a1ee7362SDavid Sterba 880f46b5a66SChristoph Hellwig return ret; 881f46b5a66SChristoph Hellwig } 882f46b5a66SChristoph Hellwig 8834260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8844260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8854260f7c7SSage Weil * whether the type of victim is right. 8864260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8874260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8884260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8894260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8904260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8914260f7c7SSage Weil * a. be owner of dir, or 8924260f7c7SSage Weil * b. be owner of victim, or 8934260f7c7SSage Weil * c. have CAP_FOWNER capability 89401327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 8954260f7c7SSage Weil * links pointing to it. 8964260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8974260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 8984260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 8994260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 9004260f7c7SSage Weil * nfs_async_unlink(). 9014260f7c7SSage Weil */ 9024260f7c7SSage Weil 9034260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 9044260f7c7SSage Weil { 9054260f7c7SSage Weil int error; 9064260f7c7SSage Weil 9072b0143b5SDavid Howells if (d_really_is_negative(victim)) 9084260f7c7SSage Weil return -ENOENT; 9094260f7c7SSage Weil 9102b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 9114fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 9124260f7c7SSage Weil 9134260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 9144260f7c7SSage Weil if (error) 9154260f7c7SSage Weil return error; 9164260f7c7SSage Weil if (IS_APPEND(dir)) 9174260f7c7SSage Weil return -EPERM; 9182b0143b5SDavid Howells if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) || 9192b0143b5SDavid Howells IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim))) 9204260f7c7SSage Weil return -EPERM; 9214260f7c7SSage Weil if (isdir) { 922e36cb0b8SDavid Howells if (!d_is_dir(victim)) 9234260f7c7SSage Weil return -ENOTDIR; 9244260f7c7SSage Weil if (IS_ROOT(victim)) 9254260f7c7SSage Weil return -EBUSY; 926e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 9274260f7c7SSage Weil return -EISDIR; 9284260f7c7SSage Weil if (IS_DEADDIR(dir)) 9294260f7c7SSage Weil return -ENOENT; 9304260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 9314260f7c7SSage Weil return -EBUSY; 9324260f7c7SSage Weil return 0; 9334260f7c7SSage Weil } 9344260f7c7SSage Weil 935cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 936cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 937cb8e7090SChristoph Hellwig { 9382b0143b5SDavid Howells if (d_really_is_positive(child)) 939cb8e7090SChristoph Hellwig return -EEXIST; 940cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 941cb8e7090SChristoph Hellwig return -ENOENT; 942cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 943cb8e7090SChristoph Hellwig } 944cb8e7090SChristoph Hellwig 945cb8e7090SChristoph Hellwig /* 946cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 947cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 948cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 949cb8e7090SChristoph Hellwig */ 95092872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 95152f75f4fSDavid Sterba const char *name, int namelen, 95272fd032eSSage Weil struct btrfs_root *snap_src, 9539babda9fSNikolay Borisov bool readonly, 9548696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 955cb8e7090SChristoph Hellwig { 9562b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9570b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 958cb8e7090SChristoph Hellwig struct dentry *dentry; 959cb8e7090SChristoph Hellwig int error; 960cb8e7090SChristoph Hellwig 96100235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 96200235411SAl Viro if (error == -EINTR) 96300235411SAl Viro return error; 964cb8e7090SChristoph Hellwig 965cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 966cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 967cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 968cb8e7090SChristoph Hellwig goto out_unlock; 969cb8e7090SChristoph Hellwig 97076dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 971cb8e7090SChristoph Hellwig if (error) 972a874a63eSLiu Bo goto out_dput; 973cb8e7090SChristoph Hellwig 9749c52057cSChris Mason /* 9759c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9769c52057cSChris Mason * check for them now when we can safely fail 9779c52057cSChris Mason */ 9789c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 9799c52057cSChris Mason dir->i_ino, name, 9809c52057cSChris Mason namelen); 9819c52057cSChris Mason if (error) 9829c52057cSChris Mason goto out_dput; 9839c52057cSChris Mason 9840b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 98576dda93cSYan, Zheng 98676dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 98776dda93cSYan, Zheng goto out_up_read; 98876dda93cSYan, Zheng 9899babda9fSNikolay Borisov if (snap_src) 9909babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 9919babda9fSNikolay Borisov else 9929babda9fSNikolay Borisov error = create_subvol(dir, dentry, name, namelen, inherit); 9939babda9fSNikolay Borisov 99476dda93cSYan, Zheng if (!error) 99576dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 99676dda93cSYan, Zheng out_up_read: 9970b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 998cb8e7090SChristoph Hellwig out_dput: 999cb8e7090SChristoph Hellwig dput(dentry); 1000cb8e7090SChristoph Hellwig out_unlock: 10015955102cSAl Viro inode_unlock(dir); 1002cb8e7090SChristoph Hellwig return error; 1003cb8e7090SChristoph Hellwig } 1004cb8e7090SChristoph Hellwig 1005c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 1006c11fbb6eSRobbie Ko const char *name, int namelen, 1007c11fbb6eSRobbie Ko struct btrfs_root *root, 1008c11fbb6eSRobbie Ko bool readonly, 1009c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 1010c11fbb6eSRobbie Ko { 1011c11fbb6eSRobbie Ko int ret; 1012c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 1013c11fbb6eSRobbie Ko 1014c11fbb6eSRobbie Ko /* 1015c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 1016c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 1017c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 1018c11fbb6eSRobbie Ko */ 1019c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 1020c11fbb6eSRobbie Ko 1021c11fbb6eSRobbie Ko ret = btrfs_start_delalloc_snapshot(root); 1022c11fbb6eSRobbie Ko if (ret) 1023c11fbb6eSRobbie Ko goto out; 1024c11fbb6eSRobbie Ko 1025c11fbb6eSRobbie Ko /* 1026c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 1027c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 1028c11fbb6eSRobbie Ko * creation. 1029c11fbb6eSRobbie Ko */ 1030c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 1031c11fbb6eSRobbie Ko snapshot_force_cow = true; 1032c11fbb6eSRobbie Ko 1033c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 1034c11fbb6eSRobbie Ko 1035c11fbb6eSRobbie Ko ret = btrfs_mksubvol(parent, name, namelen, 1036c11fbb6eSRobbie Ko root, readonly, inherit); 1037c11fbb6eSRobbie Ko out: 1038c11fbb6eSRobbie Ko if (snapshot_force_cow) 1039c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 1040c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 1041c11fbb6eSRobbie Ko return ret; 1042c11fbb6eSRobbie Ko } 1043c11fbb6eSRobbie Ko 10444cb5300bSChris Mason /* 10454cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 10464cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 10474cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 10484cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 10494cb5300bSChris Mason * part of the file 10504cb5300bSChris Mason */ 1051aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 10524cb5300bSChris Mason { 10534cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 10544cb5300bSChris Mason struct extent_map *em = NULL; 10554cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 10564cb5300bSChris Mason u64 end; 10574cb5300bSChris Mason 10584cb5300bSChris Mason read_lock(&em_tree->lock); 105909cbfeafSKirill A. Shutemov em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE); 10604cb5300bSChris Mason read_unlock(&em_tree->lock); 10614cb5300bSChris Mason 10624cb5300bSChris Mason if (em) { 10634cb5300bSChris Mason end = extent_map_end(em); 10644cb5300bSChris Mason free_extent_map(em); 10654cb5300bSChris Mason if (end - offset > thresh) 10664cb5300bSChris Mason return 0; 10674cb5300bSChris Mason } 10684cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 10694cb5300bSChris Mason thresh /= 2; 10704cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 10714cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 10724cb5300bSChris Mason if (end >= thresh) 10734cb5300bSChris Mason return 0; 10744cb5300bSChris Mason return 1; 10754cb5300bSChris Mason } 10764cb5300bSChris Mason 10774cb5300bSChris Mason /* 10784cb5300bSChris Mason * helper function to walk through a file and find extents 10794cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 10804cb5300bSChris Mason * 10814cb5300bSChris Mason * This is used by the defragging code to find new and small 10824cb5300bSChris Mason * extents 10834cb5300bSChris Mason */ 10844cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 10854cb5300bSChris Mason struct inode *inode, u64 newer_than, 1086aab110abSDavid Sterba u64 *off, u32 thresh) 10874cb5300bSChris Mason { 10884cb5300bSChris Mason struct btrfs_path *path; 10894cb5300bSChris Mason struct btrfs_key min_key; 10904cb5300bSChris Mason struct extent_buffer *leaf; 10914cb5300bSChris Mason struct btrfs_file_extent_item *extent; 10924cb5300bSChris Mason int type; 10934cb5300bSChris Mason int ret; 10944a0cc7caSNikolay Borisov u64 ino = btrfs_ino(BTRFS_I(inode)); 10954cb5300bSChris Mason 10964cb5300bSChris Mason path = btrfs_alloc_path(); 10974cb5300bSChris Mason if (!path) 10984cb5300bSChris Mason return -ENOMEM; 10994cb5300bSChris Mason 1100a4689d2bSDavid Sterba min_key.objectid = ino; 11014cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 11024cb5300bSChris Mason min_key.offset = *off; 11034cb5300bSChris Mason 11044cb5300bSChris Mason while (1) { 11056174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 11064cb5300bSChris Mason if (ret != 0) 11074cb5300bSChris Mason goto none; 1108f094c9bdSFilipe Manana process_slot: 1109a4689d2bSDavid Sterba if (min_key.objectid != ino) 11104cb5300bSChris Mason goto none; 11114cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 11124cb5300bSChris Mason goto none; 11134cb5300bSChris Mason 11144cb5300bSChris Mason leaf = path->nodes[0]; 11154cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 11164cb5300bSChris Mason struct btrfs_file_extent_item); 11174cb5300bSChris Mason 11184cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 11194cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 11204cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 11214cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 11224cb5300bSChris Mason *off = min_key.offset; 11234cb5300bSChris Mason btrfs_free_path(path); 11244cb5300bSChris Mason return 0; 11254cb5300bSChris Mason } 11264cb5300bSChris Mason 1127f094c9bdSFilipe Manana path->slots[0]++; 1128f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 1129f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 1130f094c9bdSFilipe Manana goto process_slot; 1131f094c9bdSFilipe Manana } 1132f094c9bdSFilipe Manana 11334cb5300bSChris Mason if (min_key.offset == (u64)-1) 11344cb5300bSChris Mason goto none; 11354cb5300bSChris Mason 11364cb5300bSChris Mason min_key.offset++; 11374cb5300bSChris Mason btrfs_release_path(path); 11384cb5300bSChris Mason } 11394cb5300bSChris Mason none: 11404cb5300bSChris Mason btrfs_free_path(path); 11414cb5300bSChris Mason return -ENOENT; 11424cb5300bSChris Mason } 11434cb5300bSChris Mason 11446c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 114517ce6ef8SLiu Bo { 114617ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1147940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 11486c282eb4SLi Zefan struct extent_map *em; 114909cbfeafSKirill A. Shutemov u64 len = PAGE_SIZE; 1150940100a4SChris Mason 1151940100a4SChris Mason /* 1152940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1153940100a4SChris Mason * the full extent lock 1154940100a4SChris Mason */ 1155940100a4SChris Mason read_lock(&em_tree->lock); 1156940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 1157940100a4SChris Mason read_unlock(&em_tree->lock); 1158940100a4SChris Mason 1159940100a4SChris Mason if (!em) { 1160308d9800SFilipe Manana struct extent_state *cached = NULL; 1161308d9800SFilipe Manana u64 end = start + len - 1; 1162308d9800SFilipe Manana 1163940100a4SChris Mason /* get the big lock and read metadata off disk */ 1164ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 116539b07b5dSOmar Sandoval em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len); 1166e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1167940100a4SChris Mason 11686cf8bfbfSDan Carpenter if (IS_ERR(em)) 11696c282eb4SLi Zefan return NULL; 1170940100a4SChris Mason } 1171940100a4SChris Mason 11726c282eb4SLi Zefan return em; 11736c282eb4SLi Zefan } 11746c282eb4SLi Zefan 11756c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 11766c282eb4SLi Zefan { 11776c282eb4SLi Zefan struct extent_map *next; 11786c282eb4SLi Zefan bool ret = true; 11796c282eb4SLi Zefan 11806c282eb4SLi Zefan /* this is the last extent */ 11816c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 11826c282eb4SLi Zefan return false; 11836c282eb4SLi Zefan 11846c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1185e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1186e9512d72SChris Mason ret = false; 1187e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1188ee22184bSByongho Lee (em->block_len > SZ_128K && next->block_len > SZ_128K)) 11896c282eb4SLi Zefan ret = false; 11906c282eb4SLi Zefan 11916c282eb4SLi Zefan free_extent_map(next); 11926c282eb4SLi Zefan return ret; 11936c282eb4SLi Zefan } 11946c282eb4SLi Zefan 1195aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1196a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1197a43a2111SAndrew Mahone int compress) 11986c282eb4SLi Zefan { 11996c282eb4SLi Zefan struct extent_map *em; 12006c282eb4SLi Zefan int ret = 1; 12016c282eb4SLi Zefan bool next_mergeable = true; 12024a3560c4SLiu Bo bool prev_mergeable = true; 12036c282eb4SLi Zefan 12046c282eb4SLi Zefan /* 12056c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 12066c282eb4SLi Zefan * defragging it 12076c282eb4SLi Zefan */ 12086c282eb4SLi Zefan if (start < *defrag_end) 12096c282eb4SLi Zefan return 1; 12106c282eb4SLi Zefan 12116c282eb4SLi Zefan *skip = 0; 12126c282eb4SLi Zefan 12136c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 12146c282eb4SLi Zefan if (!em) 12156c282eb4SLi Zefan return 0; 12166c282eb4SLi Zefan 1217940100a4SChris Mason /* this will cover holes, and inline extents */ 121817ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1219940100a4SChris Mason ret = 0; 122017ce6ef8SLiu Bo goto out; 122117ce6ef8SLiu Bo } 122217ce6ef8SLiu Bo 12234a3560c4SLiu Bo if (!*defrag_end) 12244a3560c4SLiu Bo prev_mergeable = false; 12254a3560c4SLiu Bo 12266c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1227940100a4SChris Mason /* 12286c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 12296c282eb4SLi Zefan * real extent, don't bother defragging it 1230940100a4SChris Mason */ 1231a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 12324a3560c4SLiu Bo (em->len >= thresh || (!next_mergeable && !prev_mergeable))) 1233940100a4SChris Mason ret = 0; 123417ce6ef8SLiu Bo out: 1235940100a4SChris Mason /* 1236940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1237940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1238940100a4SChris Mason * so that the next tiny extent will force a defrag. 1239940100a4SChris Mason * 1240940100a4SChris Mason * The end result of this is that tiny extents before a single big 1241940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1242940100a4SChris Mason */ 1243940100a4SChris Mason if (ret) { 1244940100a4SChris Mason *defrag_end = extent_map_end(em); 1245940100a4SChris Mason } else { 1246940100a4SChris Mason *last_len = 0; 1247940100a4SChris Mason *skip = extent_map_end(em); 1248940100a4SChris Mason *defrag_end = 0; 1249940100a4SChris Mason } 1250940100a4SChris Mason 1251940100a4SChris Mason free_extent_map(em); 1252940100a4SChris Mason return ret; 1253940100a4SChris Mason } 1254940100a4SChris Mason 12554cb5300bSChris Mason /* 12564cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 12574cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 12584cb5300bSChris Mason * to COW and defrag. 12594cb5300bSChris Mason * 12604cb5300bSChris Mason * It also makes sure the delalloc code has enough 12614cb5300bSChris Mason * dirty data to avoid making new small extents as part 12624cb5300bSChris Mason * of the defrag 12634cb5300bSChris Mason * 12644cb5300bSChris Mason * It's a good idea to start RA on this range 12654cb5300bSChris Mason * before calling this. 12664cb5300bSChris Mason */ 12674cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 12684cb5300bSChris Mason struct page **pages, 12694cb5300bSChris Mason unsigned long start_index, 1270c41570c9SJustin Maggard unsigned long num_pages) 1271f46b5a66SChristoph Hellwig { 12724cb5300bSChris Mason unsigned long file_end; 12734cb5300bSChris Mason u64 isize = i_size_read(inode); 1274f46b5a66SChristoph Hellwig u64 page_start; 1275f46b5a66SChristoph Hellwig u64 page_end; 12761f12bd06SLiu Bo u64 page_cnt; 12774cb5300bSChris Mason int ret; 12784cb5300bSChris Mason int i; 12794cb5300bSChris Mason int i_done; 12804cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 12814cb5300bSChris Mason struct extent_state *cached_state = NULL; 1282600a45e1SMiao Xie struct extent_io_tree *tree; 1283364ecf36SQu Wenruo struct extent_changeset *data_reserved = NULL; 12843b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 12854cb5300bSChris Mason 128609cbfeafSKirill A. Shutemov file_end = (isize - 1) >> PAGE_SHIFT; 12871f12bd06SLiu Bo if (!isize || start_index > file_end) 12881f12bd06SLiu Bo return 0; 12891f12bd06SLiu Bo 12901f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 12914cb5300bSChris Mason 1292e5b7231eSNikolay Borisov ret = btrfs_delalloc_reserve_space(BTRFS_I(inode), &data_reserved, 129309cbfeafSKirill A. Shutemov start_index << PAGE_SHIFT, 129409cbfeafSKirill A. Shutemov page_cnt << PAGE_SHIFT); 12954cb5300bSChris Mason if (ret) 12964cb5300bSChris Mason return ret; 12974cb5300bSChris Mason i_done = 0; 1298600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 12994cb5300bSChris Mason 13004cb5300bSChris Mason /* step one, lock all the pages */ 13011f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 13024cb5300bSChris Mason struct page *page; 1303600a45e1SMiao Xie again: 1304a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 13053b16a4e3SJosef Bacik start_index + i, mask); 13064cb5300bSChris Mason if (!page) 13074cb5300bSChris Mason break; 13084cb5300bSChris Mason 1309600a45e1SMiao Xie page_start = page_offset(page); 131009cbfeafSKirill A. Shutemov page_end = page_start + PAGE_SIZE - 1; 1311600a45e1SMiao Xie while (1) { 1312308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1313ff13db41SDavid Sterba &cached_state); 1314c3504372SNikolay Borisov ordered = btrfs_lookup_ordered_extent(BTRFS_I(inode), 1315600a45e1SMiao Xie page_start); 1316308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1317e43bbe5eSDavid Sterba &cached_state); 1318600a45e1SMiao Xie if (!ordered) 1319600a45e1SMiao Xie break; 1320600a45e1SMiao Xie 1321600a45e1SMiao Xie unlock_page(page); 1322c0a43603SNikolay Borisov btrfs_start_ordered_extent(ordered, 1); 1323600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1324600a45e1SMiao Xie lock_page(page); 13251f12bd06SLiu Bo /* 13261f12bd06SLiu Bo * we unlocked the page above, so we need check if 13271f12bd06SLiu Bo * it was released or not. 13281f12bd06SLiu Bo */ 13291f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 13301f12bd06SLiu Bo unlock_page(page); 133109cbfeafSKirill A. Shutemov put_page(page); 13321f12bd06SLiu Bo goto again; 13331f12bd06SLiu Bo } 1334600a45e1SMiao Xie } 1335600a45e1SMiao Xie 13364cb5300bSChris Mason if (!PageUptodate(page)) { 13374cb5300bSChris Mason btrfs_readpage(NULL, page); 13384cb5300bSChris Mason lock_page(page); 13394cb5300bSChris Mason if (!PageUptodate(page)) { 13404cb5300bSChris Mason unlock_page(page); 134109cbfeafSKirill A. Shutemov put_page(page); 13424cb5300bSChris Mason ret = -EIO; 13434cb5300bSChris Mason break; 13444cb5300bSChris Mason } 13454cb5300bSChris Mason } 1346600a45e1SMiao Xie 1347600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1348600a45e1SMiao Xie unlock_page(page); 134909cbfeafSKirill A. Shutemov put_page(page); 1350600a45e1SMiao Xie goto again; 1351600a45e1SMiao Xie } 1352600a45e1SMiao Xie 13534cb5300bSChris Mason pages[i] = page; 13544cb5300bSChris Mason i_done++; 13554cb5300bSChris Mason } 13564cb5300bSChris Mason if (!i_done || ret) 13574cb5300bSChris Mason goto out; 13584cb5300bSChris Mason 13591751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 13604cb5300bSChris Mason goto out; 13614cb5300bSChris Mason 13624cb5300bSChris Mason /* 13634cb5300bSChris Mason * so now we have a nice long stream of locked 13644cb5300bSChris Mason * and up to date pages, lets wait on them 13654cb5300bSChris Mason */ 13664cb5300bSChris Mason for (i = 0; i < i_done; i++) 13674cb5300bSChris Mason wait_on_page_writeback(pages[i]); 13684cb5300bSChris Mason 13694cb5300bSChris Mason page_start = page_offset(pages[0]); 137009cbfeafSKirill A. Shutemov page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE; 13714cb5300bSChris Mason 13724cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1373ff13db41SDavid Sterba page_start, page_end - 1, &cached_state); 13744cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 1375e182163dSOmar Sandoval page_end - 1, EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 1376e182163dSOmar Sandoval EXTENT_DEFRAG, 0, 0, &cached_state); 13774cb5300bSChris Mason 13781f12bd06SLiu Bo if (i_done != page_cnt) { 13799e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 138028c4a3e2SSu Yue btrfs_mod_outstanding_extents(BTRFS_I(inode), 1); 13819e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 138286d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 138309cbfeafSKirill A. Shutemov start_index << PAGE_SHIFT, 138443b18595SQu Wenruo (page_cnt - i_done) << PAGE_SHIFT, true); 13854cb5300bSChris Mason } 13864cb5300bSChris Mason 13874cb5300bSChris Mason 13889e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 1389018ed4f7SDavid Sterba &cached_state); 13904cb5300bSChris Mason 13914cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 1392e43bbe5eSDavid Sterba page_start, page_end - 1, &cached_state); 13934cb5300bSChris Mason 13944cb5300bSChris Mason for (i = 0; i < i_done; i++) { 13954cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 13964cb5300bSChris Mason ClearPageChecked(pages[i]); 13974cb5300bSChris Mason set_page_extent_mapped(pages[i]); 13984cb5300bSChris Mason set_page_dirty(pages[i]); 13994cb5300bSChris Mason unlock_page(pages[i]); 140009cbfeafSKirill A. Shutemov put_page(pages[i]); 14014cb5300bSChris Mason } 14028702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1403364ecf36SQu Wenruo extent_changeset_free(data_reserved); 14044cb5300bSChris Mason return i_done; 14054cb5300bSChris Mason out: 14064cb5300bSChris Mason for (i = 0; i < i_done; i++) { 14074cb5300bSChris Mason unlock_page(pages[i]); 140809cbfeafSKirill A. Shutemov put_page(pages[i]); 14094cb5300bSChris Mason } 141086d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 141109cbfeafSKirill A. Shutemov start_index << PAGE_SHIFT, 141243b18595SQu Wenruo page_cnt << PAGE_SHIFT, true); 14138702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1414364ecf36SQu Wenruo extent_changeset_free(data_reserved); 14154cb5300bSChris Mason return ret; 14164cb5300bSChris Mason 14174cb5300bSChris Mason } 14184cb5300bSChris Mason 14194cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 14204cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 14214cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 14224cb5300bSChris Mason { 14230b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 14244cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 14254cb5300bSChris Mason struct file_ra_state *ra = NULL; 14264cb5300bSChris Mason unsigned long last_index; 1427151a31b2SLi Zefan u64 isize = i_size_read(inode); 1428940100a4SChris Mason u64 last_len = 0; 1429940100a4SChris Mason u64 skip = 0; 1430940100a4SChris Mason u64 defrag_end = 0; 14314cb5300bSChris Mason u64 newer_off = range->start; 1432f46b5a66SChristoph Hellwig unsigned long i; 1433008873eaSLi Zefan unsigned long ra_index = 0; 1434f46b5a66SChristoph Hellwig int ret; 14354cb5300bSChris Mason int defrag_count = 0; 14361a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1437aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 143809cbfeafSKirill A. Shutemov unsigned long max_cluster = SZ_256K >> PAGE_SHIFT; 1439c41570c9SJustin Maggard unsigned long cluster = max_cluster; 1440ee22184bSByongho Lee u64 new_align = ~((u64)SZ_128K - 1); 14414cb5300bSChris Mason struct page **pages = NULL; 14421e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 14434cb5300bSChris Mason 14440abd5b17SLiu Bo if (isize == 0) 14450abd5b17SLiu Bo return 0; 14460abd5b17SLiu Bo 14470abd5b17SLiu Bo if (range->start >= isize) 14480abd5b17SLiu Bo return -EINVAL; 14491a419d85SLi Zefan 14501e2ef46dSDavid Sterba if (do_compress) { 1451ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 14521a419d85SLi Zefan return -EINVAL; 14531a419d85SLi Zefan if (range->compress_type) 14541a419d85SLi Zefan compress_type = range->compress_type; 14551a419d85SLi Zefan } 1456f46b5a66SChristoph Hellwig 14570abd5b17SLiu Bo if (extent_thresh == 0) 1458ee22184bSByongho Lee extent_thresh = SZ_256K; 1459f46b5a66SChristoph Hellwig 14604cb5300bSChris Mason /* 14610a52d108SDavid Sterba * If we were not given a file, allocate a readahead context. As 14620a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 14630a52d108SDavid Sterba * we don't error out. 14644cb5300bSChris Mason */ 14654cb5300bSChris Mason if (!file) { 146663e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 14670a52d108SDavid Sterba if (ra) 14684cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 14694cb5300bSChris Mason } else { 14704cb5300bSChris Mason ra = &file->f_ra; 14714cb5300bSChris Mason } 14724cb5300bSChris Mason 147363e727ecSDavid Sterba pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL); 14744cb5300bSChris Mason if (!pages) { 14754cb5300bSChris Mason ret = -ENOMEM; 14764cb5300bSChris Mason goto out_ra; 14774cb5300bSChris Mason } 14784cb5300bSChris Mason 14794cb5300bSChris Mason /* find the last page to defrag */ 14801e701a32SChris Mason if (range->start + range->len > range->start) { 1481151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 148209cbfeafSKirill A. Shutemov range->start + range->len - 1) >> PAGE_SHIFT; 14831e701a32SChris Mason } else { 148409cbfeafSKirill A. Shutemov last_index = (isize - 1) >> PAGE_SHIFT; 14851e701a32SChris Mason } 14861e701a32SChris Mason 14874cb5300bSChris Mason if (newer_than) { 14884cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 1489ee22184bSByongho Lee &newer_off, SZ_64K); 14904cb5300bSChris Mason if (!ret) { 14914cb5300bSChris Mason range->start = newer_off; 14924cb5300bSChris Mason /* 14934cb5300bSChris Mason * we always align our defrag to help keep 14944cb5300bSChris Mason * the extents in the file evenly spaced 14954cb5300bSChris Mason */ 149609cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 14974cb5300bSChris Mason } else 14984cb5300bSChris Mason goto out_ra; 14994cb5300bSChris Mason } else { 150009cbfeafSKirill A. Shutemov i = range->start >> PAGE_SHIFT; 15014cb5300bSChris Mason } 15024cb5300bSChris Mason if (!max_to_defrag) 1503070034bdSchandan max_to_defrag = last_index - i + 1; 15044cb5300bSChris Mason 15052a0f7f57SLi Zefan /* 15062a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 15072a0f7f57SLi Zefan * written sequentially. 15082a0f7f57SLi Zefan */ 15092a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 15102a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 15112a0f7f57SLi Zefan 1512f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 151309cbfeafSKirill A. Shutemov (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) { 15144cb5300bSChris Mason /* 15154cb5300bSChris Mason * make sure we stop running if someone unmounts 15164cb5300bSChris Mason * the FS 15174cb5300bSChris Mason */ 15181751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 15194cb5300bSChris Mason break; 15204cb5300bSChris Mason 15210b246afaSJeff Mahoney if (btrfs_defrag_cancelled(fs_info)) { 15220b246afaSJeff Mahoney btrfs_debug(fs_info, "defrag_file cancelled"); 1523210549ebSDavid Sterba ret = -EAGAIN; 1524210549ebSDavid Sterba break; 1525210549ebSDavid Sterba } 1526210549ebSDavid Sterba 152709cbfeafSKirill A. Shutemov if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT, 15286c282eb4SLi Zefan extent_thresh, &last_len, &skip, 15291e2ef46dSDavid Sterba &defrag_end, do_compress)){ 1530940100a4SChris Mason unsigned long next; 1531940100a4SChris Mason /* 1532940100a4SChris Mason * the should_defrag function tells us how much to skip 1533940100a4SChris Mason * bump our counter by the suggested amount 1534940100a4SChris Mason */ 153509cbfeafSKirill A. Shutemov next = DIV_ROUND_UP(skip, PAGE_SIZE); 1536940100a4SChris Mason i = max(i + 1, next); 1537940100a4SChris Mason continue; 1538940100a4SChris Mason } 1539008873eaSLi Zefan 1540008873eaSLi Zefan if (!newer_than) { 154109cbfeafSKirill A. Shutemov cluster = (PAGE_ALIGN(defrag_end) >> 154209cbfeafSKirill A. Shutemov PAGE_SHIFT) - i; 1543008873eaSLi Zefan cluster = min(cluster, max_cluster); 1544008873eaSLi Zefan } else { 1545008873eaSLi Zefan cluster = max_cluster; 1546008873eaSLi Zefan } 1547008873eaSLi Zefan 1548008873eaSLi Zefan if (i + cluster > ra_index) { 1549008873eaSLi Zefan ra_index = max(i, ra_index); 15500a52d108SDavid Sterba if (ra) 1551d3c0bab5SDavid Sterba page_cache_sync_readahead(inode->i_mapping, ra, 1552d3c0bab5SDavid Sterba file, ra_index, cluster); 1553e4826a5bSchandan ra_index += cluster; 1554008873eaSLi Zefan } 15554cb5300bSChris Mason 15565955102cSAl Viro inode_lock(inode); 1557eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1558eede2bf3SOmar Sandoval ret = -ETXTBSY; 1559eede2bf3SOmar Sandoval } else { 15601e2ef46dSDavid Sterba if (do_compress) 1561eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 1562008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1563eede2bf3SOmar Sandoval } 1564ecb8bea8SLiu Bo if (ret < 0) { 15655955102cSAl Viro inode_unlock(inode); 15664cb5300bSChris Mason goto out_ra; 1567ecb8bea8SLiu Bo } 15684cb5300bSChris Mason 15694cb5300bSChris Mason defrag_count += ret; 1570d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 15715955102cSAl Viro inode_unlock(inode); 15724cb5300bSChris Mason 15734cb5300bSChris Mason if (newer_than) { 15744cb5300bSChris Mason if (newer_off == (u64)-1) 15754cb5300bSChris Mason break; 15764cb5300bSChris Mason 1577e1f041e1SLiu Bo if (ret > 0) 1578e1f041e1SLiu Bo i += ret; 1579e1f041e1SLiu Bo 15804cb5300bSChris Mason newer_off = max(newer_off + 1, 158109cbfeafSKirill A. Shutemov (u64)i << PAGE_SHIFT); 15824cb5300bSChris Mason 1583ee22184bSByongho Lee ret = find_new_extents(root, inode, newer_than, 1584ee22184bSByongho Lee &newer_off, SZ_64K); 15854cb5300bSChris Mason if (!ret) { 15864cb5300bSChris Mason range->start = newer_off; 158709cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 15884cb5300bSChris Mason } else { 15894cb5300bSChris Mason break; 1590940100a4SChris Mason } 15914cb5300bSChris Mason } else { 1592008873eaSLi Zefan if (ret > 0) { 1593cbcc8326SLi Zefan i += ret; 159409cbfeafSKirill A. Shutemov last_len += ret << PAGE_SHIFT; 1595008873eaSLi Zefan } else { 1596940100a4SChris Mason i++; 1597008873eaSLi Zefan last_len = 0; 1598008873eaSLi Zefan } 1599f46b5a66SChristoph Hellwig } 16004cb5300bSChris Mason } 1601f46b5a66SChristoph Hellwig 1602dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 16031e701a32SChris Mason filemap_flush(inode->i_mapping); 1604dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1605dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1606dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1607dec8ef90SFilipe Manana } 16081e701a32SChris Mason 16091a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 16100b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 16115c1aab1dSNick Terrell } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) { 16125c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 16131a419d85SLi Zefan } 16141a419d85SLi Zefan 161560ccf82fSDiego Calleja ret = defrag_count; 1616940100a4SChris Mason 16174cb5300bSChris Mason out_ra: 16181e2ef46dSDavid Sterba if (do_compress) { 16195955102cSAl Viro inode_lock(inode); 1620eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 16215955102cSAl Viro inode_unlock(inode); 1622633085c7SFilipe David Borba Manana } 16234cb5300bSChris Mason if (!file) 16244cb5300bSChris Mason kfree(ra); 16254cb5300bSChris Mason kfree(pages); 1626940100a4SChris Mason return ret; 1627f46b5a66SChristoph Hellwig } 1628f46b5a66SChristoph Hellwig 1629198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 163076dda93cSYan, Zheng void __user *arg) 1631f46b5a66SChristoph Hellwig { 16320b246afaSJeff Mahoney struct inode *inode = file_inode(file); 16330b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1634f46b5a66SChristoph Hellwig u64 new_size; 1635f46b5a66SChristoph Hellwig u64 old_size; 1636f46b5a66SChristoph Hellwig u64 devid = 1; 16370b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1638f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1639f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1640f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1641f46b5a66SChristoph Hellwig char *sizestr; 16429a40f122SGui Hecheng char *retptr; 1643f46b5a66SChristoph Hellwig char *devstr = NULL; 1644f46b5a66SChristoph Hellwig int ret = 0; 1645f46b5a66SChristoph Hellwig int mod = 0; 1646f46b5a66SChristoph Hellwig 1647e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1648e441d54dSChris Mason return -EPERM; 1649e441d54dSChris Mason 1650198605a8SMiao Xie ret = mnt_want_write_file(file); 1651198605a8SMiao Xie if (ret) 1652198605a8SMiao Xie return ret; 1653198605a8SMiao Xie 1654c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_RESIZE)) { 165597547676SMiao Xie mnt_drop_write_file(file); 1656e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1657c9e9f97bSIlya Dryomov } 1658c9e9f97bSIlya Dryomov 1659dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1660c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1661c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1662c9e9f97bSIlya Dryomov goto out; 1663c9e9f97bSIlya Dryomov } 16645516e595SMark Fasheh 16655516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1666f46b5a66SChristoph Hellwig 1667f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1668f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1669f46b5a66SChristoph Hellwig if (devstr) { 1670f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1671f46b5a66SChristoph Hellwig *devstr = '\0'; 1672f46b5a66SChristoph Hellwig devstr = vol_args->name; 167358dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 167458dfae63SZhangZhen if (ret) 167558dfae63SZhangZhen goto out_free; 1676dfd79829SMiao Xie if (!devid) { 1677dfd79829SMiao Xie ret = -EINVAL; 1678dfd79829SMiao Xie goto out_free; 1679dfd79829SMiao Xie } 16800b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1681f46b5a66SChristoph Hellwig } 1682dba60f3fSMiao Xie 168309ba3bc9SAnand Jain device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL, true); 1684f46b5a66SChristoph Hellwig if (!device) { 16850b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1686c1c9ff7cSGeert Uytterhoeven devid); 1687dfd79829SMiao Xie ret = -ENODEV; 1688c9e9f97bSIlya Dryomov goto out_free; 1689f46b5a66SChristoph Hellwig } 1690dba60f3fSMiao Xie 1691ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 16920b246afaSJeff Mahoney btrfs_info(fs_info, 1693efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1694c1c9ff7cSGeert Uytterhoeven devid); 1695dfd79829SMiao Xie ret = -EPERM; 16964e42ae1bSLiu Bo goto out_free; 16974e42ae1bSLiu Bo } 16984e42ae1bSLiu Bo 1699f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1700f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1701f46b5a66SChristoph Hellwig else { 1702f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1703f46b5a66SChristoph Hellwig mod = -1; 1704f46b5a66SChristoph Hellwig sizestr++; 1705f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1706f46b5a66SChristoph Hellwig mod = 1; 1707f46b5a66SChristoph Hellwig sizestr++; 1708f46b5a66SChristoph Hellwig } 17099a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 17109a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1711f46b5a66SChristoph Hellwig ret = -EINVAL; 1712c9e9f97bSIlya Dryomov goto out_free; 1713f46b5a66SChristoph Hellwig } 1714f46b5a66SChristoph Hellwig } 1715f46b5a66SChristoph Hellwig 1716401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1717dfd79829SMiao Xie ret = -EPERM; 171863a212abSStefan Behrens goto out_free; 171963a212abSStefan Behrens } 172063a212abSStefan Behrens 17217cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1722f46b5a66SChristoph Hellwig 1723f46b5a66SChristoph Hellwig if (mod < 0) { 1724f46b5a66SChristoph Hellwig if (new_size > old_size) { 1725f46b5a66SChristoph Hellwig ret = -EINVAL; 1726c9e9f97bSIlya Dryomov goto out_free; 1727f46b5a66SChristoph Hellwig } 1728f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1729f46b5a66SChristoph Hellwig } else if (mod > 0) { 1730eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1731902c68a4SGui Hecheng ret = -ERANGE; 1732eb8052e0SWenliang Fan goto out_free; 1733eb8052e0SWenliang Fan } 1734f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1735f46b5a66SChristoph Hellwig } 1736f46b5a66SChristoph Hellwig 1737ee22184bSByongho Lee if (new_size < SZ_256M) { 1738f46b5a66SChristoph Hellwig ret = -EINVAL; 1739c9e9f97bSIlya Dryomov goto out_free; 1740f46b5a66SChristoph Hellwig } 1741f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1742f46b5a66SChristoph Hellwig ret = -EFBIG; 1743c9e9f97bSIlya Dryomov goto out_free; 1744f46b5a66SChristoph Hellwig } 1745f46b5a66SChristoph Hellwig 174647f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1747f46b5a66SChristoph Hellwig 1748f46b5a66SChristoph Hellwig if (new_size > old_size) { 1749a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 175098d5dc13STsutomu Itoh if (IS_ERR(trans)) { 175198d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1752c9e9f97bSIlya Dryomov goto out_free; 175398d5dc13STsutomu Itoh } 1754f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 17553a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1756ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1757f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 17580253f40eSjeff.liu } /* equal, nothing need to do */ 1759f46b5a66SChristoph Hellwig 1760faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1761faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1762faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1763faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 1764faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1765c9e9f97bSIlya Dryomov out_free: 1766f46b5a66SChristoph Hellwig kfree(vol_args); 1767c9e9f97bSIlya Dryomov out: 1768c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 176918f39c41SIlya Dryomov mnt_drop_write_file(file); 1770f46b5a66SChristoph Hellwig return ret; 1771f46b5a66SChristoph Hellwig } 1772f46b5a66SChristoph Hellwig 17735d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 177452f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 17755d54c67eSNikolay Borisov bool readonly, 17768696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1777f46b5a66SChristoph Hellwig { 1778f46b5a66SChristoph Hellwig int namelen; 17793de4586cSChris Mason int ret = 0; 1780f46b5a66SChristoph Hellwig 1781325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1782325c50e3SJeff Mahoney return -ENOTDIR; 1783325c50e3SJeff Mahoney 1784a874a63eSLiu Bo ret = mnt_want_write_file(file); 1785a874a63eSLiu Bo if (ret) 1786a874a63eSLiu Bo goto out; 1787a874a63eSLiu Bo 178872fd032eSSage Weil namelen = strlen(name); 178972fd032eSSage Weil if (strchr(name, '/')) { 1790f46b5a66SChristoph Hellwig ret = -EINVAL; 1791a874a63eSLiu Bo goto out_drop_write; 1792f46b5a66SChristoph Hellwig } 1793f46b5a66SChristoph Hellwig 179416780cabSChris Mason if (name[0] == '.' && 179516780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 179616780cabSChris Mason ret = -EEXIST; 1797a874a63eSLiu Bo goto out_drop_write; 179816780cabSChris Mason } 179916780cabSChris Mason 18003de4586cSChris Mason if (subvol) { 180172fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 18025d54c67eSNikolay Borisov NULL, readonly, inherit); 1803cb8e7090SChristoph Hellwig } else { 18042903ff01SAl Viro struct fd src = fdget(fd); 18053de4586cSChris Mason struct inode *src_inode; 18062903ff01SAl Viro if (!src.file) { 18073de4586cSChris Mason ret = -EINVAL; 1808a874a63eSLiu Bo goto out_drop_write; 18093de4586cSChris Mason } 18103de4586cSChris Mason 1811496ad9aaSAl Viro src_inode = file_inode(src.file); 1812496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1813c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1814efe120a0SFrank Holton "Snapshot src from another FS"); 181523ad5b17SKusanagi Kouichi ret = -EXDEV; 1816d0242061SDavid Sterba } else if (!inode_owner_or_capable(src_inode)) { 1817d0242061SDavid Sterba /* 1818d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1819d0242061SDavid Sterba * are limited to own subvolumes only 1820d0242061SDavid Sterba */ 1821d0242061SDavid Sterba ret = -EPERM; 1822ecd18815SAl Viro } else { 1823c11fbb6eSRobbie Ko ret = btrfs_mksnapshot(&file->f_path, name, namelen, 182472fd032eSSage Weil BTRFS_I(src_inode)->root, 18255d54c67eSNikolay Borisov readonly, inherit); 1826ecd18815SAl Viro } 18272903ff01SAl Viro fdput(src); 1828cb8e7090SChristoph Hellwig } 1829a874a63eSLiu Bo out_drop_write: 1830a874a63eSLiu Bo mnt_drop_write_file(file); 1831f46b5a66SChristoph Hellwig out: 183272fd032eSSage Weil return ret; 183372fd032eSSage Weil } 183472fd032eSSage Weil 183572fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1836fa0d2b9bSLi Zefan void __user *arg, int subvol) 183772fd032eSSage Weil { 1838fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 183972fd032eSSage Weil int ret; 184072fd032eSSage Weil 1841325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1842325c50e3SJeff Mahoney return -ENOTDIR; 1843325c50e3SJeff Mahoney 1844fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1845fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1846fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1847fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1848fa0d2b9bSLi Zefan 18495d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 18505d54c67eSNikolay Borisov subvol, false, NULL); 1851fa0d2b9bSLi Zefan 1852fa0d2b9bSLi Zefan kfree(vol_args); 1853fa0d2b9bSLi Zefan return ret; 1854fa0d2b9bSLi Zefan } 1855fa0d2b9bSLi Zefan 1856fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1857fa0d2b9bSLi Zefan void __user *arg, int subvol) 1858fa0d2b9bSLi Zefan { 1859fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1860fa0d2b9bSLi Zefan int ret; 1861b83cc969SLi Zefan bool readonly = false; 18626f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 186372fd032eSSage Weil 1864325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1865325c50e3SJeff Mahoney return -ENOTDIR; 1866325c50e3SJeff Mahoney 1867fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1868fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1869fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1870fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1871fdfb1e4fSLi Zefan 1872673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 1873b83cc969SLi Zefan ret = -EOPNOTSUPP; 1874c47ca32dSDan Carpenter goto free_args; 1875fdfb1e4fSLi Zefan } 1876fdfb1e4fSLi Zefan 1877b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1878b83cc969SLi Zefan readonly = true; 18796f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 188009cbfeafSKirill A. Shutemov if (vol_args->size > PAGE_SIZE) { 18816f72c7e2SArne Jansen ret = -EINVAL; 1882c47ca32dSDan Carpenter goto free_args; 18836f72c7e2SArne Jansen } 18846f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 18856f72c7e2SArne Jansen if (IS_ERR(inherit)) { 18866f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1887c47ca32dSDan Carpenter goto free_args; 18886f72c7e2SArne Jansen } 18896f72c7e2SArne Jansen } 189075eaa0e2SSage Weil 18915d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 18925d54c67eSNikolay Borisov subvol, readonly, inherit); 1893c47ca32dSDan Carpenter if (ret) 1894c47ca32dSDan Carpenter goto free_inherit; 1895c47ca32dSDan Carpenter free_inherit: 18966f72c7e2SArne Jansen kfree(inherit); 1897c47ca32dSDan Carpenter free_args: 1898c47ca32dSDan Carpenter kfree(vol_args); 1899f46b5a66SChristoph Hellwig return ret; 1900f46b5a66SChristoph Hellwig } 1901f46b5a66SChristoph Hellwig 19020caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 19030caa102dSLi Zefan void __user *arg) 19040caa102dSLi Zefan { 1905496ad9aaSAl Viro struct inode *inode = file_inode(file); 19060b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 19070caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 19080caa102dSLi Zefan int ret = 0; 19090caa102dSLi Zefan u64 flags = 0; 19100caa102dSLi Zefan 19114a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 19120caa102dSLi Zefan return -EINVAL; 19130caa102dSLi Zefan 19140b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 19150caa102dSLi Zefan if (btrfs_root_readonly(root)) 19160caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 19170b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 19180caa102dSLi Zefan 19190caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 19200caa102dSLi Zefan ret = -EFAULT; 19210caa102dSLi Zefan 19220caa102dSLi Zefan return ret; 19230caa102dSLi Zefan } 19240caa102dSLi Zefan 19250caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 19260caa102dSLi Zefan void __user *arg) 19270caa102dSLi Zefan { 1928496ad9aaSAl Viro struct inode *inode = file_inode(file); 19290b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 19300caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 19310caa102dSLi Zefan struct btrfs_trans_handle *trans; 19320caa102dSLi Zefan u64 root_flags; 19330caa102dSLi Zefan u64 flags; 19340caa102dSLi Zefan int ret = 0; 19350caa102dSLi Zefan 1936bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 1937bd60ea0fSDavid Sterba return -EPERM; 1938bd60ea0fSDavid Sterba 1939b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1940b9ca0664SLiu Bo if (ret) 1941b9ca0664SLiu Bo goto out; 19420caa102dSLi Zefan 19434a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 1944b9ca0664SLiu Bo ret = -EINVAL; 1945b9ca0664SLiu Bo goto out_drop_write; 1946b9ca0664SLiu Bo } 19470caa102dSLi Zefan 1948b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1949b9ca0664SLiu Bo ret = -EFAULT; 1950b9ca0664SLiu Bo goto out_drop_write; 1951b9ca0664SLiu Bo } 19520caa102dSLi Zefan 1953b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1954b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1955b9ca0664SLiu Bo goto out_drop_write; 1956b9ca0664SLiu Bo } 19570caa102dSLi Zefan 19580b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 19590caa102dSLi Zefan 19600caa102dSLi Zefan /* nothing to do */ 19610caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1962b9ca0664SLiu Bo goto out_drop_sem; 19630caa102dSLi Zefan 19640caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 19652c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 19660caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 19670caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 19682c686537SDavid Sterba } else { 19692c686537SDavid Sterba /* 19702c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 19712c686537SDavid Sterba * send 19722c686537SDavid Sterba */ 19732c686537SDavid Sterba spin_lock(&root->root_item_lock); 19742c686537SDavid Sterba if (root->send_in_progress == 0) { 19750caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 19760caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 19772c686537SDavid Sterba spin_unlock(&root->root_item_lock); 19782c686537SDavid Sterba } else { 19792c686537SDavid Sterba spin_unlock(&root->root_item_lock); 19800b246afaSJeff Mahoney btrfs_warn(fs_info, 19812c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 19822c686537SDavid Sterba root->root_key.objectid); 19832c686537SDavid Sterba ret = -EPERM; 19842c686537SDavid Sterba goto out_drop_sem; 19852c686537SDavid Sterba } 19862c686537SDavid Sterba } 19870caa102dSLi Zefan 19880caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 19890caa102dSLi Zefan if (IS_ERR(trans)) { 19900caa102dSLi Zefan ret = PTR_ERR(trans); 19910caa102dSLi Zefan goto out_reset; 19920caa102dSLi Zefan } 19930caa102dSLi Zefan 19940b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 19950caa102dSLi Zefan &root->root_key, &root->root_item); 19969417ebc8SNikolay Borisov if (ret < 0) { 19979417ebc8SNikolay Borisov btrfs_end_transaction(trans); 19989417ebc8SNikolay Borisov goto out_reset; 19999417ebc8SNikolay Borisov } 20000caa102dSLi Zefan 20019417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 20029417ebc8SNikolay Borisov 20030caa102dSLi Zefan out_reset: 20040caa102dSLi Zefan if (ret) 20050caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 2006b9ca0664SLiu Bo out_drop_sem: 20070b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 2008b9ca0664SLiu Bo out_drop_write: 2009b9ca0664SLiu Bo mnt_drop_write_file(file); 2010b9ca0664SLiu Bo out: 20110caa102dSLi Zefan return ret; 20120caa102dSLi Zefan } 20130caa102dSLi Zefan 2014ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 2015ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 2016ac8e9819SChris Mason { 2017abc6e134SChris Mason struct btrfs_key test; 2018abc6e134SChris Mason int ret; 2019abc6e134SChris Mason 2020abc6e134SChris Mason test.objectid = sk->min_objectid; 2021abc6e134SChris Mason test.type = sk->min_type; 2022abc6e134SChris Mason test.offset = sk->min_offset; 2023abc6e134SChris Mason 2024abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2025abc6e134SChris Mason if (ret < 0) 2026ac8e9819SChris Mason return 0; 2027abc6e134SChris Mason 2028abc6e134SChris Mason test.objectid = sk->max_objectid; 2029abc6e134SChris Mason test.type = sk->max_type; 2030abc6e134SChris Mason test.offset = sk->max_offset; 2031abc6e134SChris Mason 2032abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2033abc6e134SChris Mason if (ret > 0) 2034ac8e9819SChris Mason return 0; 2035ac8e9819SChris Mason return 1; 2036ac8e9819SChris Mason } 2037ac8e9819SChris Mason 2038df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2039ac8e9819SChris Mason struct btrfs_key *key, 2040ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 20419b6e817dSGerhard Heift size_t *buf_size, 2042ba346b35SGerhard Heift char __user *ubuf, 2043ac8e9819SChris Mason unsigned long *sk_offset, 2044ac8e9819SChris Mason int *num_found) 2045ac8e9819SChris Mason { 2046ac8e9819SChris Mason u64 found_transid; 2047ac8e9819SChris Mason struct extent_buffer *leaf; 2048ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2049dd81d459SNaohiro Aota struct btrfs_key test; 2050ac8e9819SChris Mason unsigned long item_off; 2051ac8e9819SChris Mason unsigned long item_len; 2052ac8e9819SChris Mason int nritems; 2053ac8e9819SChris Mason int i; 2054ac8e9819SChris Mason int slot; 2055ac8e9819SChris Mason int ret = 0; 2056ac8e9819SChris Mason 2057ac8e9819SChris Mason leaf = path->nodes[0]; 2058ac8e9819SChris Mason slot = path->slots[0]; 2059ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2060ac8e9819SChris Mason 2061ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2062ac8e9819SChris Mason i = nritems; 2063ac8e9819SChris Mason goto advance_key; 2064ac8e9819SChris Mason } 2065ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2066ac8e9819SChris Mason 2067ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2068ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 2069ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 2070ac8e9819SChris Mason 207103b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 207203b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 207303b71c6cSGabriel de Perthuis continue; 207403b71c6cSGabriel de Perthuis 20759b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 20768f5f6178SGerhard Heift if (*num_found) { 2077ac8e9819SChris Mason ret = 1; 20788f5f6178SGerhard Heift goto out; 20798f5f6178SGerhard Heift } 20808f5f6178SGerhard Heift 20818f5f6178SGerhard Heift /* 20828f5f6178SGerhard Heift * return one empty item back for v1, which does not 20838f5f6178SGerhard Heift * handle -EOVERFLOW 20848f5f6178SGerhard Heift */ 20858f5f6178SGerhard Heift 20869b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2087ac8e9819SChris Mason item_len = 0; 20888f5f6178SGerhard Heift ret = -EOVERFLOW; 20898f5f6178SGerhard Heift } 2090ac8e9819SChris Mason 20919b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2092ac8e9819SChris Mason ret = 1; 209325c9bc2eSGerhard Heift goto out; 2094ac8e9819SChris Mason } 2095ac8e9819SChris Mason 2096ac8e9819SChris Mason sh.objectid = key->objectid; 2097ac8e9819SChris Mason sh.offset = key->offset; 2098ac8e9819SChris Mason sh.type = key->type; 2099ac8e9819SChris Mason sh.len = item_len; 2100ac8e9819SChris Mason sh.transid = found_transid; 2101ac8e9819SChris Mason 2102a48b73ecSJosef Bacik /* 2103a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 2104a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 2105a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 2106a48b73ecSJosef Bacik * properly this next time through 2107a48b73ecSJosef Bacik */ 2108a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 2109a48b73ecSJosef Bacik ret = 0; 2110ba346b35SGerhard Heift goto out; 2111ba346b35SGerhard Heift } 2112ba346b35SGerhard Heift 2113ac8e9819SChris Mason *sk_offset += sizeof(sh); 2114ac8e9819SChris Mason 2115ac8e9819SChris Mason if (item_len) { 2116ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2117a48b73ecSJosef Bacik /* 2118a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 2119a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 2120a48b73ecSJosef Bacik */ 2121a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 2122ba346b35SGerhard Heift item_off, item_len)) { 2123a48b73ecSJosef Bacik ret = 0; 2124a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 2125ba346b35SGerhard Heift goto out; 2126ba346b35SGerhard Heift } 2127ba346b35SGerhard Heift 2128ac8e9819SChris Mason *sk_offset += item_len; 2129ac8e9819SChris Mason } 2130e2156867SHugo Mills (*num_found)++; 2131ac8e9819SChris Mason 21328f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 21338f5f6178SGerhard Heift goto out; 21348f5f6178SGerhard Heift 213525c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 213625c9bc2eSGerhard Heift ret = 1; 213725c9bc2eSGerhard Heift goto out; 213825c9bc2eSGerhard Heift } 2139ac8e9819SChris Mason } 2140ac8e9819SChris Mason advance_key: 2141ac8e9819SChris Mason ret = 0; 2142dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2143dd81d459SNaohiro Aota test.type = sk->max_type; 2144dd81d459SNaohiro Aota test.offset = sk->max_offset; 2145dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2146dd81d459SNaohiro Aota ret = 1; 2147dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2148abc6e134SChris Mason key->offset++; 2149dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2150abc6e134SChris Mason key->offset = 0; 2151abc6e134SChris Mason key->type++; 2152dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2153abc6e134SChris Mason key->offset = 0; 2154abc6e134SChris Mason key->type = 0; 2155abc6e134SChris Mason key->objectid++; 2156abc6e134SChris Mason } else 2157abc6e134SChris Mason ret = 1; 215825c9bc2eSGerhard Heift out: 2159ba346b35SGerhard Heift /* 2160ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2161ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2162ba346b35SGerhard Heift * * all items were found 2163ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2164ba346b35SGerhard Heift * leaf 2165ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2166ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2167ba346b35SGerhard Heift */ 2168ac8e9819SChris Mason return ret; 2169ac8e9819SChris Mason } 2170ac8e9819SChris Mason 2171ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 217212544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 21739b6e817dSGerhard Heift size_t *buf_size, 2174ba346b35SGerhard Heift char __user *ubuf) 2175ac8e9819SChris Mason { 21760b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2177ac8e9819SChris Mason struct btrfs_root *root; 2178ac8e9819SChris Mason struct btrfs_key key; 2179ac8e9819SChris Mason struct btrfs_path *path; 2180ac8e9819SChris Mason int ret; 2181ac8e9819SChris Mason int num_found = 0; 2182ac8e9819SChris Mason unsigned long sk_offset = 0; 2183ac8e9819SChris Mason 21849b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 21859b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 218612544442SGerhard Heift return -EOVERFLOW; 21879b6e817dSGerhard Heift } 218812544442SGerhard Heift 2189ac8e9819SChris Mason path = btrfs_alloc_path(); 2190ac8e9819SChris Mason if (!path) 2191ac8e9819SChris Mason return -ENOMEM; 2192ac8e9819SChris Mason 2193ac8e9819SChris Mason if (sk->tree_id == 0) { 2194ac8e9819SChris Mason /* search the root of the inode that was passed */ 219500246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2196ac8e9819SChris Mason } else { 219756e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2198ac8e9819SChris Mason if (IS_ERR(root)) { 2199ac8e9819SChris Mason btrfs_free_path(path); 2200ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2201ac8e9819SChris Mason } 2202ac8e9819SChris Mason } 2203ac8e9819SChris Mason 2204ac8e9819SChris Mason key.objectid = sk->min_objectid; 2205ac8e9819SChris Mason key.type = sk->min_type; 2206ac8e9819SChris Mason key.offset = sk->min_offset; 2207ac8e9819SChris Mason 2208ac8e9819SChris Mason while (1) { 22091c78544eSFilipe Manana ret = fault_in_pages_writeable(ubuf + sk_offset, 22101c78544eSFilipe Manana *buf_size - sk_offset); 2211a48b73ecSJosef Bacik if (ret) 2212a48b73ecSJosef Bacik break; 2213a48b73ecSJosef Bacik 22146174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2215ac8e9819SChris Mason if (ret != 0) { 2216ac8e9819SChris Mason if (ret > 0) 2217ac8e9819SChris Mason ret = 0; 2218ac8e9819SChris Mason goto err; 2219ac8e9819SChris Mason } 2220df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2221ac8e9819SChris Mason &sk_offset, &num_found); 2222b3b4aa74SDavid Sterba btrfs_release_path(path); 222325c9bc2eSGerhard Heift if (ret) 2224ac8e9819SChris Mason break; 2225ac8e9819SChris Mason 2226ac8e9819SChris Mason } 22278f5f6178SGerhard Heift if (ret > 0) 2228ac8e9819SChris Mason ret = 0; 2229ac8e9819SChris Mason err: 2230ac8e9819SChris Mason sk->nr_items = num_found; 223100246528SJosef Bacik btrfs_put_root(root); 2232ac8e9819SChris Mason btrfs_free_path(path); 2233ac8e9819SChris Mason return ret; 2234ac8e9819SChris Mason } 2235ac8e9819SChris Mason 2236ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2237ac8e9819SChris Mason void __user *argp) 2238ac8e9819SChris Mason { 2239ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2240ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2241ac8e9819SChris Mason struct inode *inode; 2242ac8e9819SChris Mason int ret; 22439b6e817dSGerhard Heift size_t buf_size; 2244ac8e9819SChris Mason 2245ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2246ac8e9819SChris Mason return -EPERM; 2247ac8e9819SChris Mason 2248ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2249ac8e9819SChris Mason 2250ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2251ba346b35SGerhard Heift return -EFAULT; 2252ba346b35SGerhard Heift 2253ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2254ac8e9819SChris Mason 2255496ad9aaSAl Viro inode = file_inode(file); 2256ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 22578f5f6178SGerhard Heift 22588f5f6178SGerhard Heift /* 22598f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 22608f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 22618f5f6178SGerhard Heift */ 22628f5f6178SGerhard Heift if (ret == -EOVERFLOW) 22638f5f6178SGerhard Heift ret = 0; 22648f5f6178SGerhard Heift 2265ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2266ac8e9819SChris Mason ret = -EFAULT; 2267ac8e9819SChris Mason return ret; 2268ac8e9819SChris Mason } 2269ac8e9819SChris Mason 2270cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2271cc68a8a5SGerhard Heift void __user *argp) 2272cc68a8a5SGerhard Heift { 2273cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2274cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2275cc68a8a5SGerhard Heift struct inode *inode; 2276cc68a8a5SGerhard Heift int ret; 2277cc68a8a5SGerhard Heift size_t buf_size; 2278ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2279cc68a8a5SGerhard Heift 2280cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2281cc68a8a5SGerhard Heift return -EPERM; 2282cc68a8a5SGerhard Heift 2283cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2284cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2285cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2286cc68a8a5SGerhard Heift return -EFAULT; 2287cc68a8a5SGerhard Heift 2288cc68a8a5SGerhard Heift buf_size = args.buf_size; 2289cc68a8a5SGerhard Heift 2290cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2291cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2292cc68a8a5SGerhard Heift buf_size = buf_limit; 2293cc68a8a5SGerhard Heift 2294cc68a8a5SGerhard Heift inode = file_inode(file); 2295cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2296718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2297cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2298cc68a8a5SGerhard Heift ret = -EFAULT; 2299cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2300cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2301cc68a8a5SGerhard Heift ret = -EFAULT; 2302cc68a8a5SGerhard Heift 230376dda93cSYan, Zheng return ret; 230476dda93cSYan, Zheng } 230576dda93cSYan, Zheng 230698d377a0STARUISI Hiroaki /* 2307ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2308ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 230998d377a0STARUISI Hiroaki */ 231098d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 231198d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 231298d377a0STARUISI Hiroaki { 231398d377a0STARUISI Hiroaki struct btrfs_root *root; 231498d377a0STARUISI Hiroaki struct btrfs_key key; 2315ac8e9819SChris Mason char *ptr; 231698d377a0STARUISI Hiroaki int ret = -1; 231798d377a0STARUISI Hiroaki int slot; 231898d377a0STARUISI Hiroaki int len; 231998d377a0STARUISI Hiroaki int total_len = 0; 232098d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 232198d377a0STARUISI Hiroaki struct extent_buffer *l; 232298d377a0STARUISI Hiroaki struct btrfs_path *path; 232398d377a0STARUISI Hiroaki 232498d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 232598d377a0STARUISI Hiroaki name[0]='\0'; 232698d377a0STARUISI Hiroaki return 0; 232798d377a0STARUISI Hiroaki } 232898d377a0STARUISI Hiroaki 232998d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 233098d377a0STARUISI Hiroaki if (!path) 233198d377a0STARUISI Hiroaki return -ENOMEM; 233298d377a0STARUISI Hiroaki 2333c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 233498d377a0STARUISI Hiroaki 233556e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 233698d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2337ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 233888234012SJosef Bacik root = NULL; 233988234012SJosef Bacik goto out; 234088234012SJosef Bacik } 234198d377a0STARUISI Hiroaki 234298d377a0STARUISI Hiroaki key.objectid = dirid; 234398d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 23448ad6fcabSChris Mason key.offset = (u64)-1; 234598d377a0STARUISI Hiroaki 234698d377a0STARUISI Hiroaki while (1) { 234798d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 234898d377a0STARUISI Hiroaki if (ret < 0) 234998d377a0STARUISI Hiroaki goto out; 235018674c6cSFilipe David Borba Manana else if (ret > 0) { 235118674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 235218674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 235318674c6cSFilipe David Borba Manana if (ret < 0) 235418674c6cSFilipe David Borba Manana goto out; 235518674c6cSFilipe David Borba Manana else if (ret > 0) { 2356ac8e9819SChris Mason ret = -ENOENT; 235798d377a0STARUISI Hiroaki goto out; 2358ac8e9819SChris Mason } 235918674c6cSFilipe David Borba Manana } 236018674c6cSFilipe David Borba Manana 236118674c6cSFilipe David Borba Manana l = path->nodes[0]; 236218674c6cSFilipe David Borba Manana slot = path->slots[0]; 236318674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 236498d377a0STARUISI Hiroaki 236598d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 236698d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 236798d377a0STARUISI Hiroaki ptr -= len + 1; 236898d377a0STARUISI Hiroaki total_len += len + 1; 2369a696cf35SFilipe David Borba Manana if (ptr < name) { 2370a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 237198d377a0STARUISI Hiroaki goto out; 2372a696cf35SFilipe David Borba Manana } 237398d377a0STARUISI Hiroaki 237498d377a0STARUISI Hiroaki *(ptr + len) = '/'; 237598d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 237698d377a0STARUISI Hiroaki 237798d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 237898d377a0STARUISI Hiroaki break; 237998d377a0STARUISI Hiroaki 2380b3b4aa74SDavid Sterba btrfs_release_path(path); 238198d377a0STARUISI Hiroaki key.objectid = key.offset; 23828ad6fcabSChris Mason key.offset = (u64)-1; 238398d377a0STARUISI Hiroaki dirid = key.objectid; 238498d377a0STARUISI Hiroaki } 238577906a50SLi Zefan memmove(name, ptr, total_len); 238698d377a0STARUISI Hiroaki name[total_len] = '\0'; 238798d377a0STARUISI Hiroaki ret = 0; 238898d377a0STARUISI Hiroaki out: 238900246528SJosef Bacik btrfs_put_root(root); 239098d377a0STARUISI Hiroaki btrfs_free_path(path); 2391ac8e9819SChris Mason return ret; 2392ac8e9819SChris Mason } 2393ac8e9819SChris Mason 239423d0b79dSTomohiro Misono static int btrfs_search_path_in_tree_user(struct inode *inode, 239523d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 239623d0b79dSTomohiro Misono { 239723d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 239823d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 239923d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 240023d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 240123d0b79dSTomohiro Misono u64 dirid = args->dirid; 240223d0b79dSTomohiro Misono unsigned long item_off; 240323d0b79dSTomohiro Misono unsigned long item_len; 240423d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 240523d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2406b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 240723d0b79dSTomohiro Misono struct btrfs_path *path; 240823d0b79dSTomohiro Misono struct btrfs_key key, key2; 240923d0b79dSTomohiro Misono struct extent_buffer *leaf; 241023d0b79dSTomohiro Misono struct inode *temp_inode; 241123d0b79dSTomohiro Misono char *ptr; 241223d0b79dSTomohiro Misono int slot; 241323d0b79dSTomohiro Misono int len; 241423d0b79dSTomohiro Misono int total_len = 0; 241523d0b79dSTomohiro Misono int ret; 241623d0b79dSTomohiro Misono 241723d0b79dSTomohiro Misono path = btrfs_alloc_path(); 241823d0b79dSTomohiro Misono if (!path) 241923d0b79dSTomohiro Misono return -ENOMEM; 242023d0b79dSTomohiro Misono 242123d0b79dSTomohiro Misono /* 242223d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 242323d0b79dSTomohiro Misono * construct the path in from the bottom up. 242423d0b79dSTomohiro Misono */ 242523d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 242623d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 242723d0b79dSTomohiro Misono 242856e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 242923d0b79dSTomohiro Misono if (IS_ERR(root)) { 243023d0b79dSTomohiro Misono ret = PTR_ERR(root); 243123d0b79dSTomohiro Misono goto out; 243223d0b79dSTomohiro Misono } 243323d0b79dSTomohiro Misono 243423d0b79dSTomohiro Misono key.objectid = dirid; 243523d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 243623d0b79dSTomohiro Misono key.offset = (u64)-1; 243723d0b79dSTomohiro Misono while (1) { 243823d0b79dSTomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 243923d0b79dSTomohiro Misono if (ret < 0) { 2440b8a49ae1SJosef Bacik goto out_put; 244123d0b79dSTomohiro Misono } else if (ret > 0) { 244223d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 244323d0b79dSTomohiro Misono BTRFS_INODE_REF_KEY); 244423d0b79dSTomohiro Misono if (ret < 0) { 2445b8a49ae1SJosef Bacik goto out_put; 244623d0b79dSTomohiro Misono } else if (ret > 0) { 244723d0b79dSTomohiro Misono ret = -ENOENT; 2448b8a49ae1SJosef Bacik goto out_put; 244923d0b79dSTomohiro Misono } 245023d0b79dSTomohiro Misono } 245123d0b79dSTomohiro Misono 245223d0b79dSTomohiro Misono leaf = path->nodes[0]; 245323d0b79dSTomohiro Misono slot = path->slots[0]; 245423d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 245523d0b79dSTomohiro Misono 245623d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 245723d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 245823d0b79dSTomohiro Misono ptr -= len + 1; 245923d0b79dSTomohiro Misono total_len += len + 1; 246023d0b79dSTomohiro Misono if (ptr < args->path) { 246123d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2462b8a49ae1SJosef Bacik goto out_put; 246323d0b79dSTomohiro Misono } 246423d0b79dSTomohiro Misono 246523d0b79dSTomohiro Misono *(ptr + len) = '/'; 246623d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 246723d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 246823d0b79dSTomohiro Misono 246923d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 247023d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 247123d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 247223d0b79dSTomohiro Misono if (ret < 0) { 2473b8a49ae1SJosef Bacik goto out_put; 247423d0b79dSTomohiro Misono } else if (ret > 0) { 247523d0b79dSTomohiro Misono ret = -ENOENT; 2476b8a49ae1SJosef Bacik goto out_put; 247723d0b79dSTomohiro Misono } 247823d0b79dSTomohiro Misono 247923d0b79dSTomohiro Misono leaf = path->nodes[0]; 248023d0b79dSTomohiro Misono slot = path->slots[0]; 248123d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 248223d0b79dSTomohiro Misono if (key2.objectid != dirid) { 248323d0b79dSTomohiro Misono ret = -ENOENT; 2484b8a49ae1SJosef Bacik goto out_put; 248523d0b79dSTomohiro Misono } 248623d0b79dSTomohiro Misono 24870202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 24883ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 24893ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2490b8a49ae1SJosef Bacik goto out_put; 24913ca57bd6SMisono Tomohiro } 249223d0b79dSTomohiro Misono ret = inode_permission(temp_inode, MAY_READ | MAY_EXEC); 249323d0b79dSTomohiro Misono iput(temp_inode); 249423d0b79dSTomohiro Misono if (ret) { 249523d0b79dSTomohiro Misono ret = -EACCES; 2496b8a49ae1SJosef Bacik goto out_put; 249723d0b79dSTomohiro Misono } 249823d0b79dSTomohiro Misono 249923d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 250023d0b79dSTomohiro Misono break; 250123d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 250223d0b79dSTomohiro Misono ret = -EACCES; 2503b8a49ae1SJosef Bacik goto out_put; 250423d0b79dSTomohiro Misono } 250523d0b79dSTomohiro Misono 250623d0b79dSTomohiro Misono btrfs_release_path(path); 250723d0b79dSTomohiro Misono key.objectid = key.offset; 250823d0b79dSTomohiro Misono key.offset = (u64)-1; 250923d0b79dSTomohiro Misono dirid = key.objectid; 251023d0b79dSTomohiro Misono } 251123d0b79dSTomohiro Misono 251223d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 251323d0b79dSTomohiro Misono args->path[total_len] = '\0'; 251400246528SJosef Bacik btrfs_put_root(root); 2515b8a49ae1SJosef Bacik root = NULL; 251623d0b79dSTomohiro Misono btrfs_release_path(path); 251723d0b79dSTomohiro Misono } 251823d0b79dSTomohiro Misono 251923d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 252023d0b79dSTomohiro Misono key.objectid = treeid; 252123d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 252223d0b79dSTomohiro Misono key.offset = args->treeid; 2523b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 252423d0b79dSTomohiro Misono if (ret < 0) { 252523d0b79dSTomohiro Misono goto out; 252623d0b79dSTomohiro Misono } else if (ret > 0) { 252723d0b79dSTomohiro Misono ret = -ENOENT; 252823d0b79dSTomohiro Misono goto out; 252923d0b79dSTomohiro Misono } 253023d0b79dSTomohiro Misono 253123d0b79dSTomohiro Misono leaf = path->nodes[0]; 253223d0b79dSTomohiro Misono slot = path->slots[0]; 253323d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 253423d0b79dSTomohiro Misono 253523d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 253623d0b79dSTomohiro Misono item_len = btrfs_item_size_nr(leaf, slot); 253723d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 253823d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 253923d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 254023d0b79dSTomohiro Misono ret = -EINVAL; 254123d0b79dSTomohiro Misono goto out; 254223d0b79dSTomohiro Misono } 254323d0b79dSTomohiro Misono 254423d0b79dSTomohiro Misono /* Copy subvolume's name */ 254523d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 254623d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 254723d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 254823d0b79dSTomohiro Misono args->name[item_len] = 0; 254923d0b79dSTomohiro Misono 2550b8a49ae1SJosef Bacik out_put: 255100246528SJosef Bacik btrfs_put_root(root); 255223d0b79dSTomohiro Misono out: 255323d0b79dSTomohiro Misono btrfs_free_path(path); 255423d0b79dSTomohiro Misono return ret; 255523d0b79dSTomohiro Misono } 255623d0b79dSTomohiro Misono 2557ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2558ac8e9819SChris Mason void __user *argp) 2559ac8e9819SChris Mason { 2560ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2561ac8e9819SChris Mason struct inode *inode; 256201b810b8SDavid Sterba int ret = 0; 2563ac8e9819SChris Mason 25642354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 25652354d08fSJulia Lawall if (IS_ERR(args)) 25662354d08fSJulia Lawall return PTR_ERR(args); 2567c2b96929SDan Carpenter 2568496ad9aaSAl Viro inode = file_inode(file); 2569ac8e9819SChris Mason 257001b810b8SDavid Sterba /* 257101b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 257201b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 257301b810b8SDavid Sterba */ 25741b53ac4dSChris Mason if (args->treeid == 0) 25751b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 25761b53ac4dSChris Mason 257701b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 257801b810b8SDavid Sterba args->name[0] = 0; 257901b810b8SDavid Sterba goto out; 258001b810b8SDavid Sterba } 258101b810b8SDavid Sterba 258201b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 258301b810b8SDavid Sterba ret = -EPERM; 258401b810b8SDavid Sterba goto out; 258501b810b8SDavid Sterba } 258601b810b8SDavid Sterba 2587ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2588ac8e9819SChris Mason args->treeid, args->objectid, 2589ac8e9819SChris Mason args->name); 2590ac8e9819SChris Mason 259101b810b8SDavid Sterba out: 2592ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2593ac8e9819SChris Mason ret = -EFAULT; 2594ac8e9819SChris Mason 2595ac8e9819SChris Mason kfree(args); 259698d377a0STARUISI Hiroaki return ret; 259798d377a0STARUISI Hiroaki } 259898d377a0STARUISI Hiroaki 259923d0b79dSTomohiro Misono /* 260023d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 260123d0b79dSTomohiro Misono * 260223d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 260323d0b79dSTomohiro Misono * 260423d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 260523d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 260623d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 260723d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 260823d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 260923d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 261023d0b79dSTomohiro Misono */ 261123d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 261223d0b79dSTomohiro Misono { 261323d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 261423d0b79dSTomohiro Misono struct inode *inode; 261523d0b79dSTomohiro Misono int ret; 261623d0b79dSTomohiro Misono 261723d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 261823d0b79dSTomohiro Misono if (IS_ERR(args)) 261923d0b79dSTomohiro Misono return PTR_ERR(args); 262023d0b79dSTomohiro Misono 262123d0b79dSTomohiro Misono inode = file_inode(file); 262223d0b79dSTomohiro Misono 262323d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 262423d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 262523d0b79dSTomohiro Misono /* 262623d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 262723d0b79dSTomohiro Misono * called 262823d0b79dSTomohiro Misono */ 262923d0b79dSTomohiro Misono kfree(args); 263023d0b79dSTomohiro Misono return -EACCES; 263123d0b79dSTomohiro Misono } 263223d0b79dSTomohiro Misono 263323d0b79dSTomohiro Misono ret = btrfs_search_path_in_tree_user(inode, args); 263423d0b79dSTomohiro Misono 263523d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 263623d0b79dSTomohiro Misono ret = -EFAULT; 263723d0b79dSTomohiro Misono 263823d0b79dSTomohiro Misono kfree(args); 263923d0b79dSTomohiro Misono return ret; 264023d0b79dSTomohiro Misono } 264123d0b79dSTomohiro Misono 2642b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 2643b64ec075STomohiro Misono static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) 2644b64ec075STomohiro Misono { 2645b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2646b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2647b64ec075STomohiro Misono struct btrfs_root *root; 2648b64ec075STomohiro Misono struct btrfs_path *path; 2649b64ec075STomohiro Misono struct btrfs_key key; 2650b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2651b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2652b64ec075STomohiro Misono struct extent_buffer *leaf; 2653b64ec075STomohiro Misono unsigned long item_off; 2654b64ec075STomohiro Misono unsigned long item_len; 2655b64ec075STomohiro Misono struct inode *inode; 2656b64ec075STomohiro Misono int slot; 2657b64ec075STomohiro Misono int ret = 0; 2658b64ec075STomohiro Misono 2659b64ec075STomohiro Misono path = btrfs_alloc_path(); 2660b64ec075STomohiro Misono if (!path) 2661b64ec075STomohiro Misono return -ENOMEM; 2662b64ec075STomohiro Misono 2663b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2664b64ec075STomohiro Misono if (!subvol_info) { 2665b64ec075STomohiro Misono btrfs_free_path(path); 2666b64ec075STomohiro Misono return -ENOMEM; 2667b64ec075STomohiro Misono } 2668b64ec075STomohiro Misono 2669b64ec075STomohiro Misono inode = file_inode(file); 2670b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2671b64ec075STomohiro Misono 2672b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2673b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 267456e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2675b64ec075STomohiro Misono if (IS_ERR(root)) { 2676b64ec075STomohiro Misono ret = PTR_ERR(root); 267704734e84SJosef Bacik goto out_free; 267804734e84SJosef Bacik } 2679b64ec075STomohiro Misono root_item = &root->root_item; 2680b64ec075STomohiro Misono 2681b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2682b64ec075STomohiro Misono 2683b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2684b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2685b64ec075STomohiro Misono 2686b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2687b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2688b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2689b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2690b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2691b64ec075STomohiro Misono 2692b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2693b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2694b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2695b64ec075STomohiro Misono 2696b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2697b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2698b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2699b64ec075STomohiro Misono 2700b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2701b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2702b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2703b64ec075STomohiro Misono 2704b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2705b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2706b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2707b64ec075STomohiro Misono 2708b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2709b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2710b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2711b64ec075STomohiro Misono key.offset = 0; 271204734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2713b64ec075STomohiro Misono if (ret < 0) { 2714b64ec075STomohiro Misono goto out; 2715b64ec075STomohiro Misono } else if (path->slots[0] >= 2716b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 271704734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2718b64ec075STomohiro Misono if (ret < 0) { 2719b64ec075STomohiro Misono goto out; 2720b64ec075STomohiro Misono } else if (ret > 0) { 2721b64ec075STomohiro Misono ret = -EUCLEAN; 2722b64ec075STomohiro Misono goto out; 2723b64ec075STomohiro Misono } 2724b64ec075STomohiro Misono } 2725b64ec075STomohiro Misono 2726b64ec075STomohiro Misono leaf = path->nodes[0]; 2727b64ec075STomohiro Misono slot = path->slots[0]; 2728b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2729b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2730b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2731b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2732b64ec075STomohiro Misono 2733b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2734b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2735b64ec075STomohiro Misono 2736b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2737b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 2738b64ec075STomohiro Misono item_len = btrfs_item_size_nr(leaf, slot) 2739b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2740b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2741b64ec075STomohiro Misono item_off, item_len); 2742b64ec075STomohiro Misono } else { 2743b64ec075STomohiro Misono ret = -ENOENT; 2744b64ec075STomohiro Misono goto out; 2745b64ec075STomohiro Misono } 2746b64ec075STomohiro Misono } 2747b64ec075STomohiro Misono 2748b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2749b64ec075STomohiro Misono ret = -EFAULT; 2750b64ec075STomohiro Misono 2751b64ec075STomohiro Misono out: 275200246528SJosef Bacik btrfs_put_root(root); 275304734e84SJosef Bacik out_free: 2754b64ec075STomohiro Misono btrfs_free_path(path); 2755b091f7feSWaiman Long kfree(subvol_info); 2756b64ec075STomohiro Misono return ret; 2757b64ec075STomohiro Misono } 2758b64ec075STomohiro Misono 275942e4b520STomohiro Misono /* 276042e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 276142e4b520STomohiro Misono * except the subvolume name. 276242e4b520STomohiro Misono */ 276342e4b520STomohiro Misono static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp) 276442e4b520STomohiro Misono { 276542e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 276642e4b520STomohiro Misono struct btrfs_root_ref *rref; 276742e4b520STomohiro Misono struct btrfs_root *root; 276842e4b520STomohiro Misono struct btrfs_path *path; 276942e4b520STomohiro Misono struct btrfs_key key; 277042e4b520STomohiro Misono struct extent_buffer *leaf; 277142e4b520STomohiro Misono struct inode *inode; 277242e4b520STomohiro Misono u64 objectid; 277342e4b520STomohiro Misono int slot; 277442e4b520STomohiro Misono int ret; 277542e4b520STomohiro Misono u8 found; 277642e4b520STomohiro Misono 277742e4b520STomohiro Misono path = btrfs_alloc_path(); 277842e4b520STomohiro Misono if (!path) 277942e4b520STomohiro Misono return -ENOMEM; 278042e4b520STomohiro Misono 278142e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 278242e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 278342e4b520STomohiro Misono btrfs_free_path(path); 278442e4b520STomohiro Misono return PTR_ERR(rootrefs); 278542e4b520STomohiro Misono } 278642e4b520STomohiro Misono 278742e4b520STomohiro Misono inode = file_inode(file); 278842e4b520STomohiro Misono root = BTRFS_I(inode)->root->fs_info->tree_root; 278942e4b520STomohiro Misono objectid = BTRFS_I(inode)->root->root_key.objectid; 279042e4b520STomohiro Misono 279142e4b520STomohiro Misono key.objectid = objectid; 279242e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 279342e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 279442e4b520STomohiro Misono found = 0; 279542e4b520STomohiro Misono 279642e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 279742e4b520STomohiro Misono if (ret < 0) { 279842e4b520STomohiro Misono goto out; 279942e4b520STomohiro Misono } else if (path->slots[0] >= 280042e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 280142e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 280242e4b520STomohiro Misono if (ret < 0) { 280342e4b520STomohiro Misono goto out; 280442e4b520STomohiro Misono } else if (ret > 0) { 280542e4b520STomohiro Misono ret = -EUCLEAN; 280642e4b520STomohiro Misono goto out; 280742e4b520STomohiro Misono } 280842e4b520STomohiro Misono } 280942e4b520STomohiro Misono while (1) { 281042e4b520STomohiro Misono leaf = path->nodes[0]; 281142e4b520STomohiro Misono slot = path->slots[0]; 281242e4b520STomohiro Misono 281342e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 281442e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 281542e4b520STomohiro Misono ret = 0; 281642e4b520STomohiro Misono goto out; 281742e4b520STomohiro Misono } 281842e4b520STomohiro Misono 281942e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 282042e4b520STomohiro Misono ret = -EOVERFLOW; 282142e4b520STomohiro Misono goto out; 282242e4b520STomohiro Misono } 282342e4b520STomohiro Misono 282442e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 282542e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 282642e4b520STomohiro Misono rootrefs->rootref[found].dirid = 282742e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 282842e4b520STomohiro Misono found++; 282942e4b520STomohiro Misono 283042e4b520STomohiro Misono ret = btrfs_next_item(root, path); 283142e4b520STomohiro Misono if (ret < 0) { 283242e4b520STomohiro Misono goto out; 283342e4b520STomohiro Misono } else if (ret > 0) { 283442e4b520STomohiro Misono ret = -EUCLEAN; 283542e4b520STomohiro Misono goto out; 283642e4b520STomohiro Misono } 283742e4b520STomohiro Misono } 283842e4b520STomohiro Misono 283942e4b520STomohiro Misono out: 284042e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 284142e4b520STomohiro Misono rootrefs->num_items = found; 284242e4b520STomohiro Misono /* update min_treeid for next search */ 284342e4b520STomohiro Misono if (found) 284442e4b520STomohiro Misono rootrefs->min_treeid = 284542e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 284642e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 284742e4b520STomohiro Misono ret = -EFAULT; 284842e4b520STomohiro Misono } 284942e4b520STomohiro Misono 285042e4b520STomohiro Misono kfree(rootrefs); 285142e4b520STomohiro Misono btrfs_free_path(path); 285242e4b520STomohiro Misono 285342e4b520STomohiro Misono return ret; 285442e4b520STomohiro Misono } 285542e4b520STomohiro Misono 285676dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2857949964c9SMarcos Paulo de Souza void __user *arg, 2858949964c9SMarcos Paulo de Souza bool destroy_v2) 285976dda93cSYan, Zheng { 286054563d41SAl Viro struct dentry *parent = file->f_path.dentry; 28610b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 286276dda93cSYan, Zheng struct dentry *dentry; 28632b0143b5SDavid Howells struct inode *dir = d_inode(parent); 286476dda93cSYan, Zheng struct inode *inode; 286576dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 286676dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2867949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2868949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 2869949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2870949964c9SMarcos Paulo de Souza int subvol_namelen; 287176dda93cSYan, Zheng int err = 0; 2872949964c9SMarcos Paulo de Souza bool destroy_parent = false; 287376dda93cSYan, Zheng 2874949964c9SMarcos Paulo de Souza if (destroy_v2) { 2875949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2876949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2877949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2878325c50e3SJeff Mahoney 2879949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2880949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2881949964c9SMarcos Paulo de Souza goto out; 2882949964c9SMarcos Paulo de Souza } 288376dda93cSYan, Zheng 2884949964c9SMarcos Paulo de Souza /* 2885949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2886949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2887949964c9SMarcos Paulo de Souza */ 2888949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2889949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2890949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2891949964c9SMarcos Paulo de Souza 2892949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2893949964c9SMarcos Paulo de Souza if (err) 2894949964c9SMarcos Paulo de Souza goto out; 2895949964c9SMarcos Paulo de Souza } else { 2896949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 289776dda93cSYan, Zheng err = -EINVAL; 289876dda93cSYan, Zheng goto out; 289976dda93cSYan, Zheng } 290076dda93cSYan, Zheng 2901a561be71SAl Viro err = mnt_want_write_file(file); 290276dda93cSYan, Zheng if (err) 290376dda93cSYan, Zheng goto out; 290476dda93cSYan, Zheng 2905949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 2906949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 2907949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 2908949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 2909949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 2910949964c9SMarcos Paulo de Souza goto out_drop_write; 2911949964c9SMarcos Paulo de Souza } 2912949964c9SMarcos Paulo de Souza 2913949964c9SMarcos Paulo de Souza /* 2914949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 2915949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 2916949964c9SMarcos Paulo de Souza */ 2917949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 2918949964c9SMarcos Paulo de Souza 2919949964c9SMarcos Paulo de Souza /* 2920949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 2921949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 2922949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 2923949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 2924949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 2925949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 2926949964c9SMarcos Paulo de Souza */ 2927949964c9SMarcos Paulo de Souza dput(dentry); 2928949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 2929949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 2930949964c9SMarcos Paulo de Souza goto out_drop_write; 2931949964c9SMarcos Paulo de Souza } 2932949964c9SMarcos Paulo de Souza dir = d_inode(parent); 2933949964c9SMarcos Paulo de Souza 2934949964c9SMarcos Paulo de Souza /* 2935949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 2936949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 2937949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 2938949964c9SMarcos Paulo de Souza * new parent dentry. 2939949964c9SMarcos Paulo de Souza */ 2940949964c9SMarcos Paulo de Souza destroy_parent = true; 2941949964c9SMarcos Paulo de Souza 2942949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 2943949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 2944949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 2945949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 2946949964c9SMarcos Paulo de Souza goto free_parent; 2947949964c9SMarcos Paulo de Souza } 2948949964c9SMarcos Paulo de Souza /* subvol_name_ptr is already NULL termined */ 2949949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 2950949964c9SMarcos Paulo de Souza } 2951949964c9SMarcos Paulo de Souza } else { 2952949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 2953949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 2954949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 2955949964c9SMarcos Paulo de Souza 2956949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 2957949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 2958949964c9SMarcos Paulo de Souza 2959949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2960949964c9SMarcos Paulo de Souza if (err) 2961949964c9SMarcos Paulo de Souza goto out; 2962949964c9SMarcos Paulo de Souza } 2963949964c9SMarcos Paulo de Souza 2964949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 2965949964c9SMarcos Paulo de Souza 2966949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 2967949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 2968949964c9SMarcos Paulo de Souza err = -EINVAL; 2969949964c9SMarcos Paulo de Souza goto free_subvol_name; 2970949964c9SMarcos Paulo de Souza } 2971949964c9SMarcos Paulo de Souza 2972949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 2973949964c9SMarcos Paulo de Souza err = -ENOTDIR; 2974949964c9SMarcos Paulo de Souza goto free_subvol_name; 2975949964c9SMarcos Paulo de Souza } 2976521e0546SDavid Sterba 297700235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 297800235411SAl Viro if (err == -EINTR) 2979949964c9SMarcos Paulo de Souza goto free_subvol_name; 2980949964c9SMarcos Paulo de Souza dentry = lookup_one_len(subvol_name, parent, subvol_namelen); 298176dda93cSYan, Zheng if (IS_ERR(dentry)) { 298276dda93cSYan, Zheng err = PTR_ERR(dentry); 298376dda93cSYan, Zheng goto out_unlock_dir; 298476dda93cSYan, Zheng } 298576dda93cSYan, Zheng 29862b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 298776dda93cSYan, Zheng err = -ENOENT; 298876dda93cSYan, Zheng goto out_dput; 298976dda93cSYan, Zheng } 299076dda93cSYan, Zheng 29912b0143b5SDavid Howells inode = d_inode(dentry); 29924260f7c7SSage Weil dest = BTRFS_I(inode)->root; 29934260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 29944260f7c7SSage Weil /* 29954260f7c7SSage Weil * Regular user. Only allow this with a special mount 29964260f7c7SSage Weil * option, when the user has write+exec access to the 29974260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 29984260f7c7SSage Weil * allowed. 29994260f7c7SSage Weil * 30004260f7c7SSage Weil * Note that this is _not_ check that the subvol is 30014260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 30024260f7c7SSage Weil * otherwise be able to delete. 30034260f7c7SSage Weil * 30044260f7c7SSage Weil * Users who want to delete empty subvols should try 30054260f7c7SSage Weil * rmdir(2). 30064260f7c7SSage Weil */ 30074260f7c7SSage Weil err = -EPERM; 30080b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 30094260f7c7SSage Weil goto out_dput; 30104260f7c7SSage Weil 30114260f7c7SSage Weil /* 30124260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 30134260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 30144260f7c7SSage Weil * must be called on the dentry referencing the root 30154260f7c7SSage Weil * of the subvol, not a random directory contained 30164260f7c7SSage Weil * within it. 30174260f7c7SSage Weil */ 30184260f7c7SSage Weil err = -EINVAL; 30194260f7c7SSage Weil if (root == dest) 30204260f7c7SSage Weil goto out_dput; 30214260f7c7SSage Weil 30224260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 30234260f7c7SSage Weil if (err) 30244260f7c7SSage Weil goto out_dput; 30255c39da5bSMiao Xie } 30264260f7c7SSage Weil 30275c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 30284260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 30294260f7c7SSage Weil if (err) 30304260f7c7SSage Weil goto out_dput; 30314260f7c7SSage Weil 30324a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 303376dda93cSYan, Zheng err = -EINVAL; 303476dda93cSYan, Zheng goto out_dput; 303576dda93cSYan, Zheng } 303676dda93cSYan, Zheng 30375955102cSAl Viro inode_lock(inode); 3038f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 30395955102cSAl Viro inode_unlock(inode); 304046008d9dSAmir Goldstein if (!err) { 304146008d9dSAmir Goldstein fsnotify_rmdir(dir, dentry); 304276dda93cSYan, Zheng d_delete(dentry); 304346008d9dSAmir Goldstein } 3044fa6ac876SLiu Bo 304576dda93cSYan, Zheng out_dput: 304676dda93cSYan, Zheng dput(dentry); 304776dda93cSYan, Zheng out_unlock_dir: 30485955102cSAl Viro inode_unlock(dir); 3049949964c9SMarcos Paulo de Souza free_subvol_name: 3050949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3051949964c9SMarcos Paulo de Souza free_parent: 3052949964c9SMarcos Paulo de Souza if (destroy_parent) 3053949964c9SMarcos Paulo de Souza dput(parent); 305400235411SAl Viro out_drop_write: 30552a79f17eSAl Viro mnt_drop_write_file(file); 305676dda93cSYan, Zheng out: 3057949964c9SMarcos Paulo de Souza kfree(vol_args2); 305876dda93cSYan, Zheng kfree(vol_args); 305976dda93cSYan, Zheng return err; 306076dda93cSYan, Zheng } 306176dda93cSYan, Zheng 30621e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3063f46b5a66SChristoph Hellwig { 3064496ad9aaSAl Viro struct inode *inode = file_inode(file); 3065f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 30661e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 3067c146afadSYan Zheng int ret; 3068c146afadSYan Zheng 306925122d15SIlya Dryomov ret = mnt_want_write_file(file); 307025122d15SIlya Dryomov if (ret) 307125122d15SIlya Dryomov return ret; 3072b83cc969SLi Zefan 307325122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 307425122d15SIlya Dryomov ret = -EROFS; 307525122d15SIlya Dryomov goto out; 30765ac00addSStefan Behrens } 3077f46b5a66SChristoph Hellwig 3078f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3079f46b5a66SChristoph Hellwig case S_IFDIR: 3080e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3081e441d54dSChris Mason ret = -EPERM; 3082e441d54dSChris Mason goto out; 3083e441d54dSChris Mason } 3084de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3085f46b5a66SChristoph Hellwig break; 3086f46b5a66SChristoph Hellwig case S_IFREG: 3087616d374eSAdam Borowski /* 3088616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3089616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3090616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3091616d374eSAdam Borowski */ 3092616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 3093616d374eSAdam Borowski inode_permission(inode, MAY_WRITE)) { 3094616d374eSAdam Borowski ret = -EPERM; 3095e441d54dSChris Mason goto out; 3096e441d54dSChris Mason } 30971e701a32SChris Mason 30981e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 30991e701a32SChris Mason if (!range) { 31001e701a32SChris Mason ret = -ENOMEM; 31011e701a32SChris Mason goto out; 31021e701a32SChris Mason } 31031e701a32SChris Mason 31041e701a32SChris Mason if (argp) { 31051e701a32SChris Mason if (copy_from_user(range, argp, 31061e701a32SChris Mason sizeof(*range))) { 31071e701a32SChris Mason ret = -EFAULT; 31081e701a32SChris Mason kfree(range); 3109683be16eSDan Carpenter goto out; 31101e701a32SChris Mason } 31111e701a32SChris Mason /* compression requires us to start the IO */ 31121e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 31131e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 31141e701a32SChris Mason range->extent_thresh = (u32)-1; 31151e701a32SChris Mason } 31161e701a32SChris Mason } else { 31171e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 31181e701a32SChris Mason range->len = (u64)-1; 31191e701a32SChris Mason } 3120496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 31217c829b72SAnand Jain range, BTRFS_OLDEST_GENERATION, 0); 31224cb5300bSChris Mason if (ret > 0) 31234cb5300bSChris Mason ret = 0; 31241e701a32SChris Mason kfree(range); 3125f46b5a66SChristoph Hellwig break; 31268929ecfaSYan, Zheng default: 31278929ecfaSYan, Zheng ret = -EINVAL; 3128f46b5a66SChristoph Hellwig } 3129e441d54dSChris Mason out: 313025122d15SIlya Dryomov mnt_drop_write_file(file); 3131e441d54dSChris Mason return ret; 3132f46b5a66SChristoph Hellwig } 3133f46b5a66SChristoph Hellwig 31342ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3135f46b5a66SChristoph Hellwig { 3136f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3137f46b5a66SChristoph Hellwig int ret; 3138f46b5a66SChristoph Hellwig 3139e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3140e441d54dSChris Mason return -EPERM; 3141e441d54dSChris Mason 3142c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) 3143e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3144c9e9f97bSIlya Dryomov 3145dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3146c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3147c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3148c9e9f97bSIlya Dryomov goto out; 3149c9e9f97bSIlya Dryomov } 3150f46b5a66SChristoph Hellwig 31515516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 31522ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3153f46b5a66SChristoph Hellwig 315443d20761SAnand Jain if (!ret) 31550b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 315643d20761SAnand Jain 3157f46b5a66SChristoph Hellwig kfree(vol_args); 3158c9e9f97bSIlya Dryomov out: 3159c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3160f46b5a66SChristoph Hellwig return ret; 3161f46b5a66SChristoph Hellwig } 3162f46b5a66SChristoph Hellwig 31636b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3164f46b5a66SChristoph Hellwig { 31650b246afaSJeff Mahoney struct inode *inode = file_inode(file); 31660b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 31676b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 3168f46b5a66SChristoph Hellwig int ret; 3169f46b5a66SChristoph Hellwig 3170e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3171e441d54dSChris Mason return -EPERM; 3172e441d54dSChris Mason 3173da24927bSMiao Xie ret = mnt_want_write_file(file); 3174da24927bSMiao Xie if (ret) 3175da24927bSMiao Xie return ret; 3176c146afadSYan Zheng 3177dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3178c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3179c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3180c47ca32dSDan Carpenter goto err_drop; 3181c9e9f97bSIlya Dryomov } 3182f46b5a66SChristoph Hellwig 3183748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3184fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3185fd4e994bSOmar Sandoval goto out; 3186fd4e994bSOmar Sandoval } 3187f46b5a66SChristoph Hellwig 3188c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REMOVE)) { 3189183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3190183860f6SAnand Jain goto out; 3191183860f6SAnand Jain } 3192183860f6SAnand Jain 3193735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 31942ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, NULL, vol_args->devid); 31956b526ed7SAnand Jain } else { 31966b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 31972ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 31986b526ed7SAnand Jain } 3199c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3200183860f6SAnand Jain 32016b526ed7SAnand Jain if (!ret) { 3202735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 32030b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 32046b526ed7SAnand Jain vol_args->devid); 32056b526ed7SAnand Jain else 32060b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 32076b526ed7SAnand Jain vol_args->name); 32086b526ed7SAnand Jain } 3209183860f6SAnand Jain out: 3210183860f6SAnand Jain kfree(vol_args); 3211c47ca32dSDan Carpenter err_drop: 32124ac20c70SIlya Dryomov mnt_drop_write_file(file); 3213f46b5a66SChristoph Hellwig return ret; 3214f46b5a66SChristoph Hellwig } 3215f46b5a66SChristoph Hellwig 3216f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3217f46b5a66SChristoph Hellwig { 32180b246afaSJeff Mahoney struct inode *inode = file_inode(file); 32190b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3220f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3221f46b5a66SChristoph Hellwig int ret; 3222f46b5a66SChristoph Hellwig 3223f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3224f46b5a66SChristoph Hellwig return -EPERM; 3225f46b5a66SChristoph Hellwig 3226f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3227f46b5a66SChristoph Hellwig if (ret) 3228f46b5a66SChristoph Hellwig return ret; 3229f46b5a66SChristoph Hellwig 3230c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REMOVE)) { 3231f46b5a66SChristoph Hellwig ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 323258d7bbf8SDavid Sterba goto out_drop_write; 323358d7bbf8SDavid Sterba } 323458d7bbf8SDavid Sterba 323558d7bbf8SDavid Sterba vol_args = memdup_user(arg, sizeof(*vol_args)); 323658d7bbf8SDavid Sterba if (IS_ERR(vol_args)) { 323758d7bbf8SDavid Sterba ret = PTR_ERR(vol_args); 3238f46b5a66SChristoph Hellwig goto out; 3239f46b5a66SChristoph Hellwig } 3240f46b5a66SChristoph Hellwig 324158d7bbf8SDavid Sterba vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 32422ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 3243f46b5a66SChristoph Hellwig 3244f46b5a66SChristoph Hellwig if (!ret) 32450b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3246f46b5a66SChristoph Hellwig kfree(vol_args); 324758d7bbf8SDavid Sterba out: 3248c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 324958d7bbf8SDavid Sterba out_drop_write: 3250f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 325158d7bbf8SDavid Sterba 3252f46b5a66SChristoph Hellwig return ret; 3253f46b5a66SChristoph Hellwig } 3254f46b5a66SChristoph Hellwig 32552ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 32562ff7e61eSJeff Mahoney void __user *arg) 3257475f6387SJan Schmidt { 3258027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3259475f6387SJan Schmidt struct btrfs_device *device; 32600b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3261137c5418SJohannes Thumshirn u64 flags_in; 3262027ed2f0SLi Zefan int ret = 0; 3263475f6387SJan Schmidt 3264137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3265137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3266137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3267137c5418SJohannes Thumshirn 3268137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3269137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3270027ed2f0SLi Zefan 3271d03262c7SDavid Sterba rcu_read_lock(); 3272027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3273475f6387SJan Schmidt 3274d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3275027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3276027ed2f0SLi Zefan fi_args->max_id = device->devid; 3277475f6387SJan Schmidt } 3278d03262c7SDavid Sterba rcu_read_unlock(); 3279475f6387SJan Schmidt 3280de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3281bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3282bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3283bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 328480a773fbSDavid Sterba 3285137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3286137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3287137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3288137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3289137c5418SJohannes Thumshirn } 3290137c5418SJohannes Thumshirn 32910fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 32920fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 32930fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 32940fb408a5SJohannes Thumshirn } 32950fb408a5SJohannes Thumshirn 329649bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 329749bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 329849bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 329949bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 330049bac897SJohannes Thumshirn } 330149bac897SJohannes Thumshirn 3302027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3303027ed2f0SLi Zefan ret = -EFAULT; 3304475f6387SJan Schmidt 3305027ed2f0SLi Zefan kfree(fi_args); 3306027ed2f0SLi Zefan return ret; 3307475f6387SJan Schmidt } 3308475f6387SJan Schmidt 33092ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 33102ff7e61eSJeff Mahoney void __user *arg) 3311475f6387SJan Schmidt { 3312475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3313475f6387SJan Schmidt struct btrfs_device *dev; 3314475f6387SJan Schmidt int ret = 0; 3315475f6387SJan Schmidt char *s_uuid = NULL; 3316475f6387SJan Schmidt 3317475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3318475f6387SJan Schmidt if (IS_ERR(di_args)) 3319475f6387SJan Schmidt return PTR_ERR(di_args); 3320475f6387SJan Schmidt 3321dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3322475f6387SJan Schmidt s_uuid = di_args->uuid; 3323475f6387SJan Schmidt 3324c5593ca3SDavid Sterba rcu_read_lock(); 3325e4319cd9SAnand Jain dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid, 332609ba3bc9SAnand Jain NULL, true); 3327475f6387SJan Schmidt 3328475f6387SJan Schmidt if (!dev) { 3329475f6387SJan Schmidt ret = -ENODEV; 3330475f6387SJan Schmidt goto out; 3331475f6387SJan Schmidt } 3332475f6387SJan Schmidt 3333475f6387SJan Schmidt di_args->devid = dev->devid; 33347cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 33357cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3336475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3337a27202fbSJim Meyering if (dev->name) { 3338672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3339672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3340a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3341a27202fbSJim Meyering } else { 334299ba55adSStefan Behrens di_args->path[0] = '\0'; 3343a27202fbSJim Meyering } 3344475f6387SJan Schmidt 3345475f6387SJan Schmidt out: 3346c5593ca3SDavid Sterba rcu_read_unlock(); 3347475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3348475f6387SJan Schmidt ret = -EFAULT; 3349475f6387SJan Schmidt 3350475f6387SJan Schmidt kfree(di_args); 3351475f6387SJan Schmidt return ret; 3352475f6387SJan Schmidt } 3353475f6387SJan Schmidt 33546ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 33556ef5ed0dSJosef Bacik { 3356496ad9aaSAl Viro struct inode *inode = file_inode(file); 33570b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 33586ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 33596ef5ed0dSJosef Bacik struct btrfs_root *new_root; 33606ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 33616ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 33622a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 33636ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 33646ef5ed0dSJosef Bacik u64 objectid = 0; 33656ef5ed0dSJosef Bacik u64 dir_id; 33663c04ce01SMiao Xie int ret; 33676ef5ed0dSJosef Bacik 33686ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 33696ef5ed0dSJosef Bacik return -EPERM; 33706ef5ed0dSJosef Bacik 33713c04ce01SMiao Xie ret = mnt_want_write_file(file); 33723c04ce01SMiao Xie if (ret) 33733c04ce01SMiao Xie return ret; 33743c04ce01SMiao Xie 33753c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 33763c04ce01SMiao Xie ret = -EFAULT; 33773c04ce01SMiao Xie goto out; 33783c04ce01SMiao Xie } 33796ef5ed0dSJosef Bacik 33806ef5ed0dSJosef Bacik if (!objectid) 33811cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 33826ef5ed0dSJosef Bacik 338356e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 33843c04ce01SMiao Xie if (IS_ERR(new_root)) { 33853c04ce01SMiao Xie ret = PTR_ERR(new_root); 33863c04ce01SMiao Xie goto out; 33873c04ce01SMiao Xie } 33882a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 33892a2b5d62SJosef Bacik ret = -ENOENT; 33902a2b5d62SJosef Bacik goto out_free; 33912a2b5d62SJosef Bacik } 33926ef5ed0dSJosef Bacik 33936ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 33943c04ce01SMiao Xie if (!path) { 33953c04ce01SMiao Xie ret = -ENOMEM; 33962a2b5d62SJosef Bacik goto out_free; 33973c04ce01SMiao Xie } 33986ef5ed0dSJosef Bacik path->leave_spinning = 1; 33996ef5ed0dSJosef Bacik 34006ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 340198d5dc13STsutomu Itoh if (IS_ERR(trans)) { 34023c04ce01SMiao Xie ret = PTR_ERR(trans); 34032a2b5d62SJosef Bacik goto out_free; 34046ef5ed0dSJosef Bacik } 34056ef5ed0dSJosef Bacik 34060b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 34070b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 34086ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3409cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 34102a2b5d62SJosef Bacik btrfs_release_path(path); 34113a45bb20SJeff Mahoney btrfs_end_transaction(trans); 34120b246afaSJeff Mahoney btrfs_err(fs_info, 34135d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 34143c04ce01SMiao Xie ret = -ENOENT; 34152a2b5d62SJosef Bacik goto out_free; 34166ef5ed0dSJosef Bacik } 34176ef5ed0dSJosef Bacik 34186ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 34196ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 34206ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 34212a2b5d62SJosef Bacik btrfs_release_path(path); 34226ef5ed0dSJosef Bacik 34230b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 34243a45bb20SJeff Mahoney btrfs_end_transaction(trans); 34252a2b5d62SJosef Bacik out_free: 342600246528SJosef Bacik btrfs_put_root(new_root); 34272a2b5d62SJosef Bacik btrfs_free_path(path); 34283c04ce01SMiao Xie out: 34293c04ce01SMiao Xie mnt_drop_write_file(file); 34303c04ce01SMiao Xie return ret; 34316ef5ed0dSJosef Bacik } 34326ef5ed0dSJosef Bacik 3433c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3434bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3435bf5fc093SJosef Bacik { 343632da5386SDavid Sterba struct btrfs_block_group *block_group; 3437bf5fc093SJosef Bacik 3438bf5fc093SJosef Bacik space->total_bytes = 0; 3439bf5fc093SJosef Bacik space->used_bytes = 0; 3440bf5fc093SJosef Bacik space->flags = 0; 3441bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3442bf5fc093SJosef Bacik space->flags = block_group->flags; 3443b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3444bf38be65SDavid Sterba space->used_bytes += block_group->used; 3445bf5fc093SJosef Bacik } 3446bf5fc093SJosef Bacik } 3447bf5fc093SJosef Bacik 34482ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 34492ff7e61eSJeff Mahoney void __user *arg) 34501406e432SJosef Bacik { 34511406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 34521406e432SJosef Bacik struct btrfs_ioctl_space_info space; 34531406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 34547fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 345513f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 34561406e432SJosef Bacik struct btrfs_space_info *info; 3457315d8e98SColin Ian King static const u64 types[] = { 3458315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3459bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3460bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3461315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3462315d8e98SColin Ian King }; 3463bf5fc093SJosef Bacik int num_types = 4; 34647fde62bfSChris Mason int alloc_size; 34651406e432SJosef Bacik int ret = 0; 346651788b1bSDan Rosenberg u64 slot_count = 0; 3467bf5fc093SJosef Bacik int i, c; 34681406e432SJosef Bacik 34691406e432SJosef Bacik if (copy_from_user(&space_args, 34701406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 34711406e432SJosef Bacik sizeof(space_args))) 34721406e432SJosef Bacik return -EFAULT; 34731406e432SJosef Bacik 3474bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3475bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3476bf5fc093SJosef Bacik 3477bf5fc093SJosef Bacik info = NULL; 347872804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3479bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3480bf5fc093SJosef Bacik info = tmp; 3481bf5fc093SJosef Bacik break; 3482bf5fc093SJosef Bacik } 3483bf5fc093SJosef Bacik } 34841406e432SJosef Bacik 3485bf5fc093SJosef Bacik if (!info) 3486bf5fc093SJosef Bacik continue; 3487bf5fc093SJosef Bacik 3488bf5fc093SJosef Bacik down_read(&info->groups_sem); 3489bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3490bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3491bf5fc093SJosef Bacik slot_count++; 3492bf5fc093SJosef Bacik } 3493bf5fc093SJosef Bacik up_read(&info->groups_sem); 3494bf5fc093SJosef Bacik } 3495bf5fc093SJosef Bacik 349636523e95SDavid Sterba /* 349736523e95SDavid Sterba * Global block reserve, exported as a space_info 349836523e95SDavid Sterba */ 349936523e95SDavid Sterba slot_count++; 350036523e95SDavid Sterba 35017fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 35027fde62bfSChris Mason if (space_args.space_slots == 0) { 35037fde62bfSChris Mason space_args.total_spaces = slot_count; 35047fde62bfSChris Mason goto out; 35057fde62bfSChris Mason } 3506bf5fc093SJosef Bacik 350751788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3508bf5fc093SJosef Bacik 35097fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3510bf5fc093SJosef Bacik 35117fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 35127fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 35137fde62bfSChris Mason */ 351409cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 35157fde62bfSChris Mason return -ENOMEM; 35167fde62bfSChris Mason 35177fde62bfSChris Mason space_args.total_spaces = 0; 35188d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 35197fde62bfSChris Mason if (!dest) 35207fde62bfSChris Mason return -ENOMEM; 35217fde62bfSChris Mason dest_orig = dest; 35227fde62bfSChris Mason 35237fde62bfSChris Mason /* now we have a buffer to copy into */ 3524bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3525bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3526bf5fc093SJosef Bacik 352751788b1bSDan Rosenberg if (!slot_count) 352851788b1bSDan Rosenberg break; 352951788b1bSDan Rosenberg 3530bf5fc093SJosef Bacik info = NULL; 353172804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3532bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3533bf5fc093SJosef Bacik info = tmp; 35347fde62bfSChris Mason break; 3535bf5fc093SJosef Bacik } 3536bf5fc093SJosef Bacik } 35377fde62bfSChris Mason 3538bf5fc093SJosef Bacik if (!info) 3539bf5fc093SJosef Bacik continue; 3540bf5fc093SJosef Bacik down_read(&info->groups_sem); 3541bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3542bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3543c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3544c065f5b1SSu Yue &space); 35457fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 35461406e432SJosef Bacik dest++; 35471406e432SJosef Bacik space_args.total_spaces++; 354851788b1bSDan Rosenberg slot_count--; 35491406e432SJosef Bacik } 355051788b1bSDan Rosenberg if (!slot_count) 355151788b1bSDan Rosenberg break; 3552bf5fc093SJosef Bacik } 3553bf5fc093SJosef Bacik up_read(&info->groups_sem); 3554bf5fc093SJosef Bacik } 35551406e432SJosef Bacik 355636523e95SDavid Sterba /* 355736523e95SDavid Sterba * Add global block reserve 355836523e95SDavid Sterba */ 355936523e95SDavid Sterba if (slot_count) { 35600b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 356136523e95SDavid Sterba 356236523e95SDavid Sterba spin_lock(&block_rsv->lock); 356336523e95SDavid Sterba space.total_bytes = block_rsv->size; 356436523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 356536523e95SDavid Sterba spin_unlock(&block_rsv->lock); 356636523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 356736523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 356836523e95SDavid Sterba space_args.total_spaces++; 356936523e95SDavid Sterba } 357036523e95SDavid Sterba 35712eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 35727fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 35737fde62bfSChris Mason 35747fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 35757fde62bfSChris Mason ret = -EFAULT; 35767fde62bfSChris Mason 35777fde62bfSChris Mason kfree(dest_orig); 35787fde62bfSChris Mason out: 35797fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 35801406e432SJosef Bacik ret = -EFAULT; 35811406e432SJosef Bacik 35821406e432SJosef Bacik return ret; 35831406e432SJosef Bacik } 35841406e432SJosef Bacik 35859a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 35869a8c28beSMiao Xie void __user *argp) 358746204592SSage Weil { 358846204592SSage Weil struct btrfs_trans_handle *trans; 358946204592SSage Weil u64 transid; 3590db5b493aSTsutomu Itoh int ret; 359146204592SSage Weil 3592d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3593ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3594ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 359598d5dc13STsutomu Itoh return PTR_ERR(trans); 3596ff7c1d33SMiao Xie 3597ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3598ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3599ff7c1d33SMiao Xie goto out; 3600ff7c1d33SMiao Xie } 360146204592SSage Weil transid = trans->transid; 36023a45bb20SJeff Mahoney ret = btrfs_commit_transaction_async(trans, 0); 36038b2b2d3cSTsutomu Itoh if (ret) { 36043a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3605db5b493aSTsutomu Itoh return ret; 36068b2b2d3cSTsutomu Itoh } 3607ff7c1d33SMiao Xie out: 360846204592SSage Weil if (argp) 360946204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 361046204592SSage Weil return -EFAULT; 361146204592SSage Weil return 0; 361246204592SSage Weil } 361346204592SSage Weil 36142ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 36159a8c28beSMiao Xie void __user *argp) 361646204592SSage Weil { 361746204592SSage Weil u64 transid; 361846204592SSage Weil 361946204592SSage Weil if (argp) { 362046204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 362146204592SSage Weil return -EFAULT; 362246204592SSage Weil } else { 362346204592SSage Weil transid = 0; /* current trans */ 362446204592SSage Weil } 36252ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 362646204592SSage Weil } 362746204592SSage Weil 3628b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3629475f6387SJan Schmidt { 36300b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3631475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3632b8e95489SMiao Xie int ret; 3633475f6387SJan Schmidt 3634475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3635475f6387SJan Schmidt return -EPERM; 3636475f6387SJan Schmidt 3637475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3638475f6387SJan Schmidt if (IS_ERR(sa)) 3639475f6387SJan Schmidt return PTR_ERR(sa); 3640475f6387SJan Schmidt 3641b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3642b8e95489SMiao Xie ret = mnt_want_write_file(file); 3643b8e95489SMiao Xie if (ret) 3644b8e95489SMiao Xie goto out; 3645b8e95489SMiao Xie } 3646b8e95489SMiao Xie 36470b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 364863a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 364963a212abSStefan Behrens 0); 3650475f6387SJan Schmidt 36515afe6ce7SFilipe Manana /* 36525afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 36535afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 36545afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 36555afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 36565afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 36575afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 36585afe6ce7SFilipe Manana * previously (btrfs-progs does this). 36595afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 36605afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 36615afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 36625afe6ce7SFilipe Manana */ 36635afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3664475f6387SJan Schmidt ret = -EFAULT; 3665475f6387SJan Schmidt 3666b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3667b8e95489SMiao Xie mnt_drop_write_file(file); 3668b8e95489SMiao Xie out: 3669475f6387SJan Schmidt kfree(sa); 3670475f6387SJan Schmidt return ret; 3671475f6387SJan Schmidt } 3672475f6387SJan Schmidt 36732ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3674475f6387SJan Schmidt { 3675475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3676475f6387SJan Schmidt return -EPERM; 3677475f6387SJan Schmidt 36782ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3679475f6387SJan Schmidt } 3680475f6387SJan Schmidt 36812ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3682475f6387SJan Schmidt void __user *arg) 3683475f6387SJan Schmidt { 3684475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3685475f6387SJan Schmidt int ret; 3686475f6387SJan Schmidt 3687475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3688475f6387SJan Schmidt return -EPERM; 3689475f6387SJan Schmidt 3690475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3691475f6387SJan Schmidt if (IS_ERR(sa)) 3692475f6387SJan Schmidt return PTR_ERR(sa); 3693475f6387SJan Schmidt 36942ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3695475f6387SJan Schmidt 36964fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3697475f6387SJan Schmidt ret = -EFAULT; 3698475f6387SJan Schmidt 3699475f6387SJan Schmidt kfree(sa); 3700475f6387SJan Schmidt return ret; 3701475f6387SJan Schmidt } 3702475f6387SJan Schmidt 37032ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3704b27f7c0cSDavid Sterba void __user *arg) 3705c11d2c23SStefan Behrens { 3706c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3707c11d2c23SStefan Behrens int ret; 3708c11d2c23SStefan Behrens 3709c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3710c11d2c23SStefan Behrens if (IS_ERR(sa)) 3711c11d2c23SStefan Behrens return PTR_ERR(sa); 3712c11d2c23SStefan Behrens 3713b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3714b27f7c0cSDavid Sterba kfree(sa); 3715b27f7c0cSDavid Sterba return -EPERM; 3716b27f7c0cSDavid Sterba } 3717b27f7c0cSDavid Sterba 37182ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3719c11d2c23SStefan Behrens 3720eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3721c11d2c23SStefan Behrens ret = -EFAULT; 3722c11d2c23SStefan Behrens 3723c11d2c23SStefan Behrens kfree(sa); 3724c11d2c23SStefan Behrens return ret; 3725c11d2c23SStefan Behrens } 3726c11d2c23SStefan Behrens 37272ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 37282ff7e61eSJeff Mahoney void __user *arg) 37293f6bcfbdSStefan Behrens { 37303f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 37313f6bcfbdSStefan Behrens int ret; 37323f6bcfbdSStefan Behrens 37333f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 37343f6bcfbdSStefan Behrens return -EPERM; 37353f6bcfbdSStefan Behrens 37363f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 37373f6bcfbdSStefan Behrens if (IS_ERR(p)) 37383f6bcfbdSStefan Behrens return PTR_ERR(p); 37393f6bcfbdSStefan Behrens 37403f6bcfbdSStefan Behrens switch (p->cmd) { 37413f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3742bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3743adfa97cbSIlya Dryomov ret = -EROFS; 3744adfa97cbSIlya Dryomov goto out; 3745adfa97cbSIlya Dryomov } 3746c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 3747e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 37483f6bcfbdSStefan Behrens } else { 37492ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3750c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 37513f6bcfbdSStefan Behrens } 37523f6bcfbdSStefan Behrens break; 37533f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 37540b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 37553f6bcfbdSStefan Behrens ret = 0; 37563f6bcfbdSStefan Behrens break; 37573f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 375817d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 375997282031SAnand Jain ret = 0; 37603f6bcfbdSStefan Behrens break; 37613f6bcfbdSStefan Behrens default: 37623f6bcfbdSStefan Behrens ret = -EINVAL; 37633f6bcfbdSStefan Behrens break; 37643f6bcfbdSStefan Behrens } 37653f6bcfbdSStefan Behrens 3766d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 37673f6bcfbdSStefan Behrens ret = -EFAULT; 3768adfa97cbSIlya Dryomov out: 37693f6bcfbdSStefan Behrens kfree(p); 37703f6bcfbdSStefan Behrens return ret; 37713f6bcfbdSStefan Behrens } 37723f6bcfbdSStefan Behrens 3773d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3774d7728c96SJan Schmidt { 3775d7728c96SJan Schmidt int ret = 0; 3776d7728c96SJan Schmidt int i; 3777740c3d22SChris Mason u64 rel_ptr; 3778d7728c96SJan Schmidt int size; 3779806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3780d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3781d7728c96SJan Schmidt struct btrfs_path *path; 3782d7728c96SJan Schmidt 378382b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3784d7728c96SJan Schmidt return -EPERM; 3785d7728c96SJan Schmidt 3786d7728c96SJan Schmidt path = btrfs_alloc_path(); 3787d7728c96SJan Schmidt if (!path) { 3788d7728c96SJan Schmidt ret = -ENOMEM; 3789d7728c96SJan Schmidt goto out; 3790d7728c96SJan Schmidt } 3791d7728c96SJan Schmidt 3792d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3793d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3794d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3795d7728c96SJan Schmidt ipa = NULL; 3796d7728c96SJan Schmidt goto out; 3797d7728c96SJan Schmidt } 3798d7728c96SJan Schmidt 3799d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3800d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3801d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3802d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3803d7728c96SJan Schmidt ipath = NULL; 3804d7728c96SJan Schmidt goto out; 3805d7728c96SJan Schmidt } 3806d7728c96SJan Schmidt 3807d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3808d7728c96SJan Schmidt if (ret < 0) 3809d7728c96SJan Schmidt goto out; 3810d7728c96SJan Schmidt 3811d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3812745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3813745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3814740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3815d7728c96SJan Schmidt } 3816d7728c96SJan Schmidt 3817718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3818718dc5faSOmar Sandoval ipath->fspath, size); 3819d7728c96SJan Schmidt if (ret) { 3820d7728c96SJan Schmidt ret = -EFAULT; 3821d7728c96SJan Schmidt goto out; 3822d7728c96SJan Schmidt } 3823d7728c96SJan Schmidt 3824d7728c96SJan Schmidt out: 3825d7728c96SJan Schmidt btrfs_free_path(path); 3826d7728c96SJan Schmidt free_ipath(ipath); 3827d7728c96SJan Schmidt kfree(ipa); 3828d7728c96SJan Schmidt 3829d7728c96SJan Schmidt return ret; 3830d7728c96SJan Schmidt } 3831d7728c96SJan Schmidt 3832d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3833d7728c96SJan Schmidt { 3834d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3835d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3836d7728c96SJan Schmidt 3837d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3838d7728c96SJan Schmidt inodes->bytes_left -= c; 3839d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3840d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3841d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3842d7728c96SJan Schmidt inodes->elem_cnt += 3; 3843d7728c96SJan Schmidt } else { 3844d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3845d7728c96SJan Schmidt inodes->bytes_left = 0; 3846d7728c96SJan Schmidt inodes->elem_missed += 3; 3847d7728c96SJan Schmidt } 3848d7728c96SJan Schmidt 3849d7728c96SJan Schmidt return 0; 3850d7728c96SJan Schmidt } 3851d7728c96SJan Schmidt 38522ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3853d24a67b2SZygo Blaxell void __user *arg, int version) 3854d7728c96SJan Schmidt { 3855d7728c96SJan Schmidt int ret = 0; 3856d7728c96SJan Schmidt int size; 3857d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3858d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3859d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3860d24a67b2SZygo Blaxell bool ignore_offset; 3861d7728c96SJan Schmidt 3862d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3863d7728c96SJan Schmidt return -EPERM; 3864d7728c96SJan Schmidt 3865d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 38667b9ea627SShailendra Verma if (IS_ERR(loi)) 38677b9ea627SShailendra Verma return PTR_ERR(loi); 3868d7728c96SJan Schmidt 3869d24a67b2SZygo Blaxell if (version == 1) { 3870d24a67b2SZygo Blaxell ignore_offset = false; 3871b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 3872d24a67b2SZygo Blaxell } else { 3873d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 3874d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 3875d24a67b2SZygo Blaxell ret = -EINVAL; 3876d24a67b2SZygo Blaxell goto out_loi; 3877d24a67b2SZygo Blaxell } 3878d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 3879d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 3880d24a67b2SZygo Blaxell ret = -EINVAL; 3881d24a67b2SZygo Blaxell goto out_loi; 3882d24a67b2SZygo Blaxell } 3883d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 3884b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 3885d24a67b2SZygo Blaxell } 3886d24a67b2SZygo Blaxell 3887d7728c96SJan Schmidt path = btrfs_alloc_path(); 3888d7728c96SJan Schmidt if (!path) { 3889d7728c96SJan Schmidt ret = -ENOMEM; 3890d7728c96SJan Schmidt goto out; 3891d7728c96SJan Schmidt } 3892d7728c96SJan Schmidt 3893d7728c96SJan Schmidt inodes = init_data_container(size); 3894d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3895d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3896d7728c96SJan Schmidt inodes = NULL; 3897d7728c96SJan Schmidt goto out; 3898d7728c96SJan Schmidt } 3899d7728c96SJan Schmidt 39002ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 3901d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 3902df031f07SLiu Bo if (ret == -EINVAL) 3903d7728c96SJan Schmidt ret = -ENOENT; 3904d7728c96SJan Schmidt if (ret < 0) 3905d7728c96SJan Schmidt goto out; 3906d7728c96SJan Schmidt 3907718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 3908718dc5faSOmar Sandoval size); 3909d7728c96SJan Schmidt if (ret) 3910d7728c96SJan Schmidt ret = -EFAULT; 3911d7728c96SJan Schmidt 3912d7728c96SJan Schmidt out: 3913d7728c96SJan Schmidt btrfs_free_path(path); 3914f54de068SDavid Sterba kvfree(inodes); 3915d24a67b2SZygo Blaxell out_loi: 3916d7728c96SJan Schmidt kfree(loi); 3917d7728c96SJan Schmidt 3918d7728c96SJan Schmidt return ret; 3919d7728c96SJan Schmidt } 3920d7728c96SJan Schmidt 3921008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 3922c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3923c9e9f97bSIlya Dryomov { 3924c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3925c9e9f97bSIlya Dryomov 3926c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3927c9e9f97bSIlya Dryomov 39283009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 3929837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3930837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3931837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3932a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3933a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3934837d5b6eSIlya Dryomov 3935c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3936c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3937c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 393819a39dceSIlya Dryomov 393919a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 394019a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 394119a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 3942c9e9f97bSIlya Dryomov } 3943c9e9f97bSIlya Dryomov 39449ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3945c9e9f97bSIlya Dryomov { 3946496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3947c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3948c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3949c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3950ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 3951c9e9f97bSIlya Dryomov int ret; 3952c9e9f97bSIlya Dryomov 3953c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3954c9e9f97bSIlya Dryomov return -EPERM; 3955c9e9f97bSIlya Dryomov 3956e54bfa31SLiu Bo ret = mnt_want_write_file(file); 39579ba1f6e4SLiu Bo if (ret) 39589ba1f6e4SLiu Bo return ret; 39599ba1f6e4SLiu Bo 3960ed0fb78fSIlya Dryomov again: 3961c3e1f96cSGoldwyn Rodrigues if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 3962c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3963ed0fb78fSIlya Dryomov need_unlock = true; 3964ed0fb78fSIlya Dryomov goto locked; 3965ed0fb78fSIlya Dryomov } 3966ed0fb78fSIlya Dryomov 3967ed0fb78fSIlya Dryomov /* 396801327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 3969ed0fb78fSIlya Dryomov * (1) some other op is running 3970ed0fb78fSIlya Dryomov * (2) balance is running 3971ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 3972ed0fb78fSIlya Dryomov */ 3973ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3974ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3975ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 39763009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 3977ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3978dccdb07bSDavid Sterba /* 3979dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 3980dccdb07bSDavid Sterba * we'll reexamine the status again. 3981dccdb07bSDavid Sterba */ 3982ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3983ed0fb78fSIlya Dryomov 3984ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 39853009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 3986ed0fb78fSIlya Dryomov /* this is (3) */ 3987ed0fb78fSIlya Dryomov need_unlock = false; 3988ed0fb78fSIlya Dryomov goto locked; 3989ed0fb78fSIlya Dryomov } 3990ed0fb78fSIlya Dryomov 3991ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3992ed0fb78fSIlya Dryomov goto again; 3993ed0fb78fSIlya Dryomov } else { 3994ed0fb78fSIlya Dryomov /* this is (2) */ 3995ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3996ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 3997ed0fb78fSIlya Dryomov goto out; 3998ed0fb78fSIlya Dryomov } 3999ed0fb78fSIlya Dryomov } else { 4000ed0fb78fSIlya Dryomov /* this is (1) */ 4001ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4002e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4003ed0fb78fSIlya Dryomov goto out; 4004ed0fb78fSIlya Dryomov } 4005ed0fb78fSIlya Dryomov 4006ed0fb78fSIlya Dryomov locked: 4007c9e9f97bSIlya Dryomov 4008c9e9f97bSIlya Dryomov if (arg) { 4009c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4010c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4011c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4012ed0fb78fSIlya Dryomov goto out_unlock; 4013c9e9f97bSIlya Dryomov } 4014de322263SIlya Dryomov 4015de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4016de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4017de322263SIlya Dryomov ret = -ENOTCONN; 4018de322263SIlya Dryomov goto out_bargs; 4019de322263SIlya Dryomov } 4020de322263SIlya Dryomov 4021de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4022de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4023de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4024de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4025de322263SIlya Dryomov 4026de322263SIlya Dryomov goto do_balance; 4027de322263SIlya Dryomov } 4028c9e9f97bSIlya Dryomov } else { 4029c9e9f97bSIlya Dryomov bargs = NULL; 4030c9e9f97bSIlya Dryomov } 4031c9e9f97bSIlya Dryomov 4032ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4033837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4034837d5b6eSIlya Dryomov goto out_bargs; 4035837d5b6eSIlya Dryomov } 4036837d5b6eSIlya Dryomov 40378d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4038c9e9f97bSIlya Dryomov if (!bctl) { 4039c9e9f97bSIlya Dryomov ret = -ENOMEM; 4040c9e9f97bSIlya Dryomov goto out_bargs; 4041c9e9f97bSIlya Dryomov } 4042c9e9f97bSIlya Dryomov 4043c9e9f97bSIlya Dryomov if (arg) { 4044c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4045c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4046c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4047c9e9f97bSIlya Dryomov 4048c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4049f43ffb60SIlya Dryomov } else { 4050f43ffb60SIlya Dryomov /* balance everything - no filters */ 4051f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4052c9e9f97bSIlya Dryomov } 4053c9e9f97bSIlya Dryomov 40548eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 40558eb93459SDavid Sterba ret = -EINVAL; 40560f89abf5SChristian Engelmayer goto out_bctl; 40578eb93459SDavid Sterba } 40588eb93459SDavid Sterba 4059de322263SIlya Dryomov do_balance: 4060c9e9f97bSIlya Dryomov /* 4061c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 4062c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 4063c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 4064c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 4065c9e9f97bSIlya Dryomov */ 4066ed0fb78fSIlya Dryomov need_unlock = false; 4067ed0fb78fSIlya Dryomov 40686fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 40690f89abf5SChristian Engelmayer bctl = NULL; 4070ed0fb78fSIlya Dryomov 4071d00c2d9cSFilipe Manana if ((ret == 0 || ret == -ECANCELED) && arg) { 4072c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4073c9e9f97bSIlya Dryomov ret = -EFAULT; 4074c9e9f97bSIlya Dryomov } 4075c9e9f97bSIlya Dryomov 40760f89abf5SChristian Engelmayer out_bctl: 40770f89abf5SChristian Engelmayer kfree(bctl); 4078c9e9f97bSIlya Dryomov out_bargs: 4079c9e9f97bSIlya Dryomov kfree(bargs); 4080ed0fb78fSIlya Dryomov out_unlock: 4081c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4082ed0fb78fSIlya Dryomov if (need_unlock) 4083c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 4084ed0fb78fSIlya Dryomov out: 4085e54bfa31SLiu Bo mnt_drop_write_file(file); 4086c9e9f97bSIlya Dryomov return ret; 4087c9e9f97bSIlya Dryomov } 4088c9e9f97bSIlya Dryomov 40892ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4090837d5b6eSIlya Dryomov { 4091837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4092837d5b6eSIlya Dryomov return -EPERM; 4093837d5b6eSIlya Dryomov 4094837d5b6eSIlya Dryomov switch (cmd) { 4095837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 40960b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4097a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 40980b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4099837d5b6eSIlya Dryomov } 4100837d5b6eSIlya Dryomov 4101837d5b6eSIlya Dryomov return -EINVAL; 4102837d5b6eSIlya Dryomov } 4103837d5b6eSIlya Dryomov 41042ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 410519a39dceSIlya Dryomov void __user *arg) 410619a39dceSIlya Dryomov { 410719a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 410819a39dceSIlya Dryomov int ret = 0; 410919a39dceSIlya Dryomov 411019a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 411119a39dceSIlya Dryomov return -EPERM; 411219a39dceSIlya Dryomov 411319a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 411419a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 411519a39dceSIlya Dryomov ret = -ENOTCONN; 411619a39dceSIlya Dryomov goto out; 411719a39dceSIlya Dryomov } 411819a39dceSIlya Dryomov 41198d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 412019a39dceSIlya Dryomov if (!bargs) { 412119a39dceSIlya Dryomov ret = -ENOMEM; 412219a39dceSIlya Dryomov goto out; 412319a39dceSIlya Dryomov } 412419a39dceSIlya Dryomov 4125008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 412619a39dceSIlya Dryomov 412719a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 412819a39dceSIlya Dryomov ret = -EFAULT; 412919a39dceSIlya Dryomov 413019a39dceSIlya Dryomov kfree(bargs); 413119a39dceSIlya Dryomov out: 413219a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 413319a39dceSIlya Dryomov return ret; 413419a39dceSIlya Dryomov } 413519a39dceSIlya Dryomov 4136905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 41375d13a37bSArne Jansen { 41380b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41390b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41405d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 41415d13a37bSArne Jansen int ret; 41425d13a37bSArne Jansen 41435d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41445d13a37bSArne Jansen return -EPERM; 41455d13a37bSArne Jansen 4146905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4147905b0ddaSMiao Xie if (ret) 4148905b0ddaSMiao Xie return ret; 41495d13a37bSArne Jansen 41505d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4151905b0ddaSMiao Xie if (IS_ERR(sa)) { 4152905b0ddaSMiao Xie ret = PTR_ERR(sa); 4153905b0ddaSMiao Xie goto drop_write; 4154905b0ddaSMiao Xie } 41555d13a37bSArne Jansen 41560b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 41575d13a37bSArne Jansen 41585d13a37bSArne Jansen switch (sa->cmd) { 41595d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4160340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 41615d13a37bSArne Jansen break; 41625d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4163340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 41645d13a37bSArne Jansen break; 41655d13a37bSArne Jansen default: 41665d13a37bSArne Jansen ret = -EINVAL; 41675d13a37bSArne Jansen break; 41685d13a37bSArne Jansen } 41695d13a37bSArne Jansen 41705d13a37bSArne Jansen kfree(sa); 41710b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4172905b0ddaSMiao Xie drop_write: 4173905b0ddaSMiao Xie mnt_drop_write_file(file); 41745d13a37bSArne Jansen return ret; 41755d13a37bSArne Jansen } 41765d13a37bSArne Jansen 4177905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 41785d13a37bSArne Jansen { 41790b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41800b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41810b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 41825d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 41835d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41845d13a37bSArne Jansen int ret; 41855d13a37bSArne Jansen int err; 41865d13a37bSArne Jansen 41875d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41885d13a37bSArne Jansen return -EPERM; 41895d13a37bSArne Jansen 4190905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4191905b0ddaSMiao Xie if (ret) 4192905b0ddaSMiao Xie return ret; 41935d13a37bSArne Jansen 41945d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4195905b0ddaSMiao Xie if (IS_ERR(sa)) { 4196905b0ddaSMiao Xie ret = PTR_ERR(sa); 4197905b0ddaSMiao Xie goto drop_write; 4198905b0ddaSMiao Xie } 41995d13a37bSArne Jansen 42005d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42015d13a37bSArne Jansen if (IS_ERR(trans)) { 42025d13a37bSArne Jansen ret = PTR_ERR(trans); 42035d13a37bSArne Jansen goto out; 42045d13a37bSArne Jansen } 42055d13a37bSArne Jansen 42065d13a37bSArne Jansen if (sa->assign) { 42079f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 42085d13a37bSArne Jansen } else { 420939616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 42105d13a37bSArne Jansen } 42115d13a37bSArne Jansen 4212e082f563SQu Wenruo /* update qgroup status and info */ 4213280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4214e082f563SQu Wenruo if (err < 0) 42150b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4216ad8403dfSAnand Jain "failed to update qgroup status and info"); 42173a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 42185d13a37bSArne Jansen if (err && !ret) 42195d13a37bSArne Jansen ret = err; 42205d13a37bSArne Jansen 42215d13a37bSArne Jansen out: 42225d13a37bSArne Jansen kfree(sa); 4223905b0ddaSMiao Xie drop_write: 4224905b0ddaSMiao Xie mnt_drop_write_file(file); 42255d13a37bSArne Jansen return ret; 42265d13a37bSArne Jansen } 42275d13a37bSArne Jansen 4228905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 42295d13a37bSArne Jansen { 42300b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42310b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42325d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 42335d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42345d13a37bSArne Jansen int ret; 42355d13a37bSArne Jansen int err; 42365d13a37bSArne Jansen 42375d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42385d13a37bSArne Jansen return -EPERM; 42395d13a37bSArne Jansen 4240905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4241905b0ddaSMiao Xie if (ret) 4242905b0ddaSMiao Xie return ret; 42435d13a37bSArne Jansen 42445d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4245905b0ddaSMiao Xie if (IS_ERR(sa)) { 4246905b0ddaSMiao Xie ret = PTR_ERR(sa); 4247905b0ddaSMiao Xie goto drop_write; 4248905b0ddaSMiao Xie } 42495d13a37bSArne Jansen 4250d86e56cfSMiao Xie if (!sa->qgroupid) { 4251d86e56cfSMiao Xie ret = -EINVAL; 4252d86e56cfSMiao Xie goto out; 4253d86e56cfSMiao Xie } 4254d86e56cfSMiao Xie 42555d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42565d13a37bSArne Jansen if (IS_ERR(trans)) { 42575d13a37bSArne Jansen ret = PTR_ERR(trans); 42585d13a37bSArne Jansen goto out; 42595d13a37bSArne Jansen } 42605d13a37bSArne Jansen 42615d13a37bSArne Jansen if (sa->create) { 426249a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 42635d13a37bSArne Jansen } else { 42643efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 42655d13a37bSArne Jansen } 42665d13a37bSArne Jansen 42673a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 42685d13a37bSArne Jansen if (err && !ret) 42695d13a37bSArne Jansen ret = err; 42705d13a37bSArne Jansen 42715d13a37bSArne Jansen out: 42725d13a37bSArne Jansen kfree(sa); 4273905b0ddaSMiao Xie drop_write: 4274905b0ddaSMiao Xie mnt_drop_write_file(file); 42755d13a37bSArne Jansen return ret; 42765d13a37bSArne Jansen } 42775d13a37bSArne Jansen 4278905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 42795d13a37bSArne Jansen { 42800b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42810b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42825d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 42835d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42845d13a37bSArne Jansen int ret; 42855d13a37bSArne Jansen int err; 42865d13a37bSArne Jansen u64 qgroupid; 42875d13a37bSArne Jansen 42885d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42895d13a37bSArne Jansen return -EPERM; 42905d13a37bSArne Jansen 4291905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4292905b0ddaSMiao Xie if (ret) 4293905b0ddaSMiao Xie return ret; 42945d13a37bSArne Jansen 42955d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4296905b0ddaSMiao Xie if (IS_ERR(sa)) { 4297905b0ddaSMiao Xie ret = PTR_ERR(sa); 4298905b0ddaSMiao Xie goto drop_write; 4299905b0ddaSMiao Xie } 43005d13a37bSArne Jansen 43015d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43025d13a37bSArne Jansen if (IS_ERR(trans)) { 43035d13a37bSArne Jansen ret = PTR_ERR(trans); 43045d13a37bSArne Jansen goto out; 43055d13a37bSArne Jansen } 43065d13a37bSArne Jansen 43075d13a37bSArne Jansen qgroupid = sa->qgroupid; 43085d13a37bSArne Jansen if (!qgroupid) { 43095d13a37bSArne Jansen /* take the current subvol as qgroup */ 43105d13a37bSArne Jansen qgroupid = root->root_key.objectid; 43115d13a37bSArne Jansen } 43125d13a37bSArne Jansen 4313f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 43145d13a37bSArne Jansen 43153a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 43165d13a37bSArne Jansen if (err && !ret) 43175d13a37bSArne Jansen ret = err; 43185d13a37bSArne Jansen 43195d13a37bSArne Jansen out: 43205d13a37bSArne Jansen kfree(sa); 4321905b0ddaSMiao Xie drop_write: 4322905b0ddaSMiao Xie mnt_drop_write_file(file); 43235d13a37bSArne Jansen return ret; 43245d13a37bSArne Jansen } 43255d13a37bSArne Jansen 43262f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 43272f232036SJan Schmidt { 43280b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43290b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 43302f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 43312f232036SJan Schmidt int ret; 43322f232036SJan Schmidt 43332f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 43342f232036SJan Schmidt return -EPERM; 43352f232036SJan Schmidt 43362f232036SJan Schmidt ret = mnt_want_write_file(file); 43372f232036SJan Schmidt if (ret) 43382f232036SJan Schmidt return ret; 43392f232036SJan Schmidt 43402f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 43412f232036SJan Schmidt if (IS_ERR(qsa)) { 43422f232036SJan Schmidt ret = PTR_ERR(qsa); 43432f232036SJan Schmidt goto drop_write; 43442f232036SJan Schmidt } 43452f232036SJan Schmidt 43462f232036SJan Schmidt if (qsa->flags) { 43472f232036SJan Schmidt ret = -EINVAL; 43482f232036SJan Schmidt goto out; 43492f232036SJan Schmidt } 43502f232036SJan Schmidt 43510b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 43522f232036SJan Schmidt 43532f232036SJan Schmidt out: 43542f232036SJan Schmidt kfree(qsa); 43552f232036SJan Schmidt drop_write: 43562f232036SJan Schmidt mnt_drop_write_file(file); 43572f232036SJan Schmidt return ret; 43582f232036SJan Schmidt } 43592f232036SJan Schmidt 4360b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4361b929c1d8SMarcos Paulo de Souza void __user *arg) 43622f232036SJan Schmidt { 43632f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 43642f232036SJan Schmidt int ret = 0; 43652f232036SJan Schmidt 43662f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 43672f232036SJan Schmidt return -EPERM; 43682f232036SJan Schmidt 43698d2db785SDavid Sterba qsa = kzalloc(sizeof(*qsa), GFP_KERNEL); 43702f232036SJan Schmidt if (!qsa) 43712f232036SJan Schmidt return -ENOMEM; 43722f232036SJan Schmidt 43730b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 43742f232036SJan Schmidt qsa->flags = 1; 43750b246afaSJeff Mahoney qsa->progress = fs_info->qgroup_rescan_progress.objectid; 43762f232036SJan Schmidt } 43772f232036SJan Schmidt 43782f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 43792f232036SJan Schmidt ret = -EFAULT; 43802f232036SJan Schmidt 43812f232036SJan Schmidt kfree(qsa); 43822f232036SJan Schmidt return ret; 43832f232036SJan Schmidt } 43842f232036SJan Schmidt 4385b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4386b929c1d8SMarcos Paulo de Souza void __user *arg) 438757254b6eSJan Schmidt { 438857254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 438957254b6eSJan Schmidt return -EPERM; 439057254b6eSJan Schmidt 43910b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 439257254b6eSJan Schmidt } 439357254b6eSJan Schmidt 4394abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4395abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 43968ea05e3aSAlexander Block { 4397496ad9aaSAl Viro struct inode *inode = file_inode(file); 43980b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 43998ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 44008ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 44018ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 440295582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 44038ea05e3aSAlexander Block int ret = 0; 4404dd5f9615SStefan Behrens int received_uuid_changed; 44058ea05e3aSAlexander Block 4406bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 4407bd60ea0fSDavid Sterba return -EPERM; 4408bd60ea0fSDavid Sterba 44098ea05e3aSAlexander Block ret = mnt_want_write_file(file); 44108ea05e3aSAlexander Block if (ret < 0) 44118ea05e3aSAlexander Block return ret; 44128ea05e3aSAlexander Block 44130b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 44148ea05e3aSAlexander Block 44154a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 44168ea05e3aSAlexander Block ret = -EINVAL; 44178ea05e3aSAlexander Block goto out; 44188ea05e3aSAlexander Block } 44198ea05e3aSAlexander Block 44208ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 44218ea05e3aSAlexander Block ret = -EROFS; 44228ea05e3aSAlexander Block goto out; 44238ea05e3aSAlexander Block } 44248ea05e3aSAlexander Block 4425dd5f9615SStefan Behrens /* 4426dd5f9615SStefan Behrens * 1 - root item 4427dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4428dd5f9615SStefan Behrens */ 4429dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 44308ea05e3aSAlexander Block if (IS_ERR(trans)) { 44318ea05e3aSAlexander Block ret = PTR_ERR(trans); 44328ea05e3aSAlexander Block trans = NULL; 44338ea05e3aSAlexander Block goto out; 44348ea05e3aSAlexander Block } 44358ea05e3aSAlexander Block 44368ea05e3aSAlexander Block sa->rtransid = trans->transid; 44378ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 44388ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 44398ea05e3aSAlexander Block 4440dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4441dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4442dd5f9615SStefan Behrens if (received_uuid_changed && 4443d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4444d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4445dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4446dd5f9615SStefan Behrens root->root_key.objectid); 4447d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4448d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4449d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4450d87ff758SNikolay Borisov goto out; 4451d87ff758SNikolay Borisov } 4452d87ff758SNikolay Borisov } 44538ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 44548ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 44558ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 44563cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 44573cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 44583cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 44593cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 44608ea05e3aSAlexander Block 44610b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 44628ea05e3aSAlexander Block &root->root_key, &root->root_item); 44638ea05e3aSAlexander Block if (ret < 0) { 44643a45bb20SJeff Mahoney btrfs_end_transaction(trans); 44658ea05e3aSAlexander Block goto out; 4466dd5f9615SStefan Behrens } 4467dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4468cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4469dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4470dd5f9615SStefan Behrens root->root_key.objectid); 4471dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 447266642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4473efd38150SNikolay Borisov btrfs_end_transaction(trans); 4474dd5f9615SStefan Behrens goto out; 4475dd5f9615SStefan Behrens } 4476dd5f9615SStefan Behrens } 44773a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4478abccd00fSHugo Mills out: 44790b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4480abccd00fSHugo Mills mnt_drop_write_file(file); 4481abccd00fSHugo Mills return ret; 4482abccd00fSHugo Mills } 4483abccd00fSHugo Mills 4484abccd00fSHugo Mills #ifdef CONFIG_64BIT 4485abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4486abccd00fSHugo Mills void __user *arg) 4487abccd00fSHugo Mills { 4488abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4489abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4490abccd00fSHugo Mills int ret = 0; 4491abccd00fSHugo Mills 4492abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 44937b9ea627SShailendra Verma if (IS_ERR(args32)) 44947b9ea627SShailendra Verma return PTR_ERR(args32); 4495abccd00fSHugo Mills 44968d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 449784dbeb87SDan Carpenter if (!args64) { 449884dbeb87SDan Carpenter ret = -ENOMEM; 4499abccd00fSHugo Mills goto out; 4500abccd00fSHugo Mills } 4501abccd00fSHugo Mills 4502abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4503abccd00fSHugo Mills args64->stransid = args32->stransid; 4504abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4505abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4506abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4507abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4508abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4509abccd00fSHugo Mills args64->flags = args32->flags; 4510abccd00fSHugo Mills 4511abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4512abccd00fSHugo Mills if (ret) 4513abccd00fSHugo Mills goto out; 4514abccd00fSHugo Mills 4515abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4516abccd00fSHugo Mills args32->stransid = args64->stransid; 4517abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4518abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4519abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4520abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4521abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4522abccd00fSHugo Mills args32->flags = args64->flags; 4523abccd00fSHugo Mills 4524abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4525abccd00fSHugo Mills if (ret) 4526abccd00fSHugo Mills ret = -EFAULT; 4527abccd00fSHugo Mills 4528abccd00fSHugo Mills out: 4529abccd00fSHugo Mills kfree(args32); 4530abccd00fSHugo Mills kfree(args64); 4531abccd00fSHugo Mills return ret; 4532abccd00fSHugo Mills } 4533abccd00fSHugo Mills #endif 4534abccd00fSHugo Mills 4535abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4536abccd00fSHugo Mills void __user *arg) 4537abccd00fSHugo Mills { 4538abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4539abccd00fSHugo Mills int ret = 0; 4540abccd00fSHugo Mills 4541abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 45427b9ea627SShailendra Verma if (IS_ERR(sa)) 45437b9ea627SShailendra Verma return PTR_ERR(sa); 4544abccd00fSHugo Mills 4545abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4546abccd00fSHugo Mills 4547abccd00fSHugo Mills if (ret) 4548abccd00fSHugo Mills goto out; 4549abccd00fSHugo Mills 45508ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 45518ea05e3aSAlexander Block if (ret) 45528ea05e3aSAlexander Block ret = -EFAULT; 45538ea05e3aSAlexander Block 45548ea05e3aSAlexander Block out: 45558ea05e3aSAlexander Block kfree(sa); 45568ea05e3aSAlexander Block return ret; 45578ea05e3aSAlexander Block } 45588ea05e3aSAlexander Block 4559b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4560b929c1d8SMarcos Paulo de Souza void __user *arg) 4561867ab667Sjeff.liu { 4562a1b83ac5SAnand Jain size_t len; 4563867ab667Sjeff.liu int ret; 4564a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4565a1b83ac5SAnand Jain 45660b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 45670b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 45680b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4569a1b83ac5SAnand Jain 4570a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4571867ab667Sjeff.liu 4572867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 45730b246afaSJeff Mahoney btrfs_warn(fs_info, 45740b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 45750b246afaSJeff Mahoney --len); 4576867ab667Sjeff.liu } 4577867ab667Sjeff.liu 4578867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4579867ab667Sjeff.liu 4580867ab667Sjeff.liu return ret ? -EFAULT : 0; 4581867ab667Sjeff.liu } 4582867ab667Sjeff.liu 4583a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4584a8bfd4abSjeff.liu { 45850b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45860b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45870b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 45880b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4589a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4590a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4591a8bfd4abSjeff.liu int ret; 4592a8bfd4abSjeff.liu 4593a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4594a8bfd4abSjeff.liu return -EPERM; 4595a8bfd4abSjeff.liu 4596a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4597a8bfd4abSjeff.liu return -EFAULT; 4598a8bfd4abSjeff.liu 4599a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 46000b246afaSJeff Mahoney btrfs_err(fs_info, 46015d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4602a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4603a8bfd4abSjeff.liu return -EINVAL; 4604a8bfd4abSjeff.liu } 4605a8bfd4abSjeff.liu 4606a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4607a8bfd4abSjeff.liu if (ret) 4608a8bfd4abSjeff.liu return ret; 4609a8bfd4abSjeff.liu 4610a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4611a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4612a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4613a8bfd4abSjeff.liu goto out_unlock; 4614a8bfd4abSjeff.liu } 4615a8bfd4abSjeff.liu 46160b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4617a8bfd4abSjeff.liu strcpy(super_block->label, label); 46180b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 46193a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4620a8bfd4abSjeff.liu 4621a8bfd4abSjeff.liu out_unlock: 4622a8bfd4abSjeff.liu mnt_drop_write_file(file); 4623a8bfd4abSjeff.liu return ret; 4624a8bfd4abSjeff.liu } 4625a8bfd4abSjeff.liu 46262eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 46272eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 46282eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 46292eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 46302eaa055fSJeff Mahoney 4631d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 46322eaa055fSJeff Mahoney { 46334d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 46342eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 46352eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 46362eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 46372eaa055fSJeff Mahoney }; 46382eaa055fSJeff Mahoney 46392eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 46402eaa055fSJeff Mahoney return -EFAULT; 46412eaa055fSJeff Mahoney 46422eaa055fSJeff Mahoney return 0; 46432eaa055fSJeff Mahoney } 46442eaa055fSJeff Mahoney 4645b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4646b929c1d8SMarcos Paulo de Souza void __user *arg) 46472eaa055fSJeff Mahoney { 46480b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 46492eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 46502eaa055fSJeff Mahoney 46512eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 46522eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 46532eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 46542eaa055fSJeff Mahoney 46552eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 46562eaa055fSJeff Mahoney return -EFAULT; 46572eaa055fSJeff Mahoney 46582eaa055fSJeff Mahoney return 0; 46592eaa055fSJeff Mahoney } 46602eaa055fSJeff Mahoney 46612ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 46623b02a68aSJeff Mahoney enum btrfs_feature_set set, 46632eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 46642eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 46652eaa055fSJeff Mahoney { 4666f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 46673b02a68aSJeff Mahoney char *names; 46682eaa055fSJeff Mahoney u64 disallowed, unsupported; 46692eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 46702eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 46712eaa055fSJeff Mahoney 46722eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 46732eaa055fSJeff Mahoney if (unsupported) { 46743b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 46753b02a68aSJeff Mahoney if (names) { 46760b246afaSJeff Mahoney btrfs_warn(fs_info, 46773b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 46783b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46793b02a68aSJeff Mahoney kfree(names); 46803b02a68aSJeff Mahoney } else 46810b246afaSJeff Mahoney btrfs_warn(fs_info, 46822eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 46832eaa055fSJeff Mahoney type, unsupported); 46842eaa055fSJeff Mahoney return -EOPNOTSUPP; 46852eaa055fSJeff Mahoney } 46862eaa055fSJeff Mahoney 46872eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 46882eaa055fSJeff Mahoney if (disallowed) { 46893b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 46903b02a68aSJeff Mahoney if (names) { 46910b246afaSJeff Mahoney btrfs_warn(fs_info, 46923b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 46933b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46943b02a68aSJeff Mahoney kfree(names); 46953b02a68aSJeff Mahoney } else 46960b246afaSJeff Mahoney btrfs_warn(fs_info, 46972eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 46982eaa055fSJeff Mahoney type, disallowed); 46992eaa055fSJeff Mahoney return -EPERM; 47002eaa055fSJeff Mahoney } 47012eaa055fSJeff Mahoney 47022eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 47032eaa055fSJeff Mahoney if (disallowed) { 47043b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47053b02a68aSJeff Mahoney if (names) { 47060b246afaSJeff Mahoney btrfs_warn(fs_info, 47073b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 47083b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47093b02a68aSJeff Mahoney kfree(names); 47103b02a68aSJeff Mahoney } else 47110b246afaSJeff Mahoney btrfs_warn(fs_info, 47122eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 47132eaa055fSJeff Mahoney type, disallowed); 47142eaa055fSJeff Mahoney return -EPERM; 47152eaa055fSJeff Mahoney } 47162eaa055fSJeff Mahoney 47172eaa055fSJeff Mahoney return 0; 47182eaa055fSJeff Mahoney } 47192eaa055fSJeff Mahoney 47202ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 47212ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 47222eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 47232eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 47242eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 47252eaa055fSJeff Mahoney 47262eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 47272eaa055fSJeff Mahoney { 47280b246afaSJeff Mahoney struct inode *inode = file_inode(file); 47290b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 47300b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 47310b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 47322eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 47332eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 47342eaa055fSJeff Mahoney u64 newflags; 47352eaa055fSJeff Mahoney int ret; 47362eaa055fSJeff Mahoney 47372eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 47382eaa055fSJeff Mahoney return -EPERM; 47392eaa055fSJeff Mahoney 47402eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 47412eaa055fSJeff Mahoney return -EFAULT; 47422eaa055fSJeff Mahoney 47432eaa055fSJeff Mahoney /* Nothing to do */ 47442eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 47452eaa055fSJeff Mahoney !flags[0].incompat_flags) 47462eaa055fSJeff Mahoney return 0; 47472eaa055fSJeff Mahoney 47482ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 47492eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 47502eaa055fSJeff Mahoney if (ret) 47512eaa055fSJeff Mahoney return ret; 47522eaa055fSJeff Mahoney 47532ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 47542eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 47552eaa055fSJeff Mahoney if (ret) 47562eaa055fSJeff Mahoney return ret; 47572eaa055fSJeff Mahoney 47582ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 47592eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 47602eaa055fSJeff Mahoney if (ret) 47612eaa055fSJeff Mahoney return ret; 47622eaa055fSJeff Mahoney 47637ab19625SDavid Sterba ret = mnt_want_write_file(file); 47647ab19625SDavid Sterba if (ret) 47657ab19625SDavid Sterba return ret; 47667ab19625SDavid Sterba 47678051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 47687ab19625SDavid Sterba if (IS_ERR(trans)) { 47697ab19625SDavid Sterba ret = PTR_ERR(trans); 47707ab19625SDavid Sterba goto out_drop_write; 47717ab19625SDavid Sterba } 47722eaa055fSJeff Mahoney 47730b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 47742eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 47752eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 47762eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 47772eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 47782eaa055fSJeff Mahoney 47792eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 47802eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 47812eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 47822eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 47832eaa055fSJeff Mahoney 47842eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 47852eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 47862eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 47872eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 47880b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 47892eaa055fSJeff Mahoney 47903a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 47917ab19625SDavid Sterba out_drop_write: 47927ab19625SDavid Sterba mnt_drop_write_file(file); 47937ab19625SDavid Sterba 47947ab19625SDavid Sterba return ret; 47952eaa055fSJeff Mahoney } 47962eaa055fSJeff Mahoney 47972351f431SJosef Bacik static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) 47982351f431SJosef Bacik { 47992351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 48002351f431SJosef Bacik int ret; 48012351f431SJosef Bacik 48022351f431SJosef Bacik if (compat) { 48032351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 48042351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 48052351f431SJosef Bacik 48062351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 48072351f431SJosef Bacik if (ret) 48082351f431SJosef Bacik return -EFAULT; 48092351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 48102351f431SJosef Bacik if (!arg) 48112351f431SJosef Bacik return -ENOMEM; 48122351f431SJosef Bacik arg->send_fd = args32.send_fd; 48132351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 48142351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 48152351f431SJosef Bacik arg->parent_root = args32.parent_root; 48162351f431SJosef Bacik arg->flags = args32.flags; 48172351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 48182351f431SJosef Bacik sizeof(args32.reserved)); 48192351f431SJosef Bacik #else 48202351f431SJosef Bacik return -ENOTTY; 48212351f431SJosef Bacik #endif 48222351f431SJosef Bacik } else { 48232351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 48242351f431SJosef Bacik if (IS_ERR(arg)) 48252351f431SJosef Bacik return PTR_ERR(arg); 48262351f431SJosef Bacik } 48272351f431SJosef Bacik ret = btrfs_ioctl_send(file, arg); 48282351f431SJosef Bacik kfree(arg); 48292351f431SJosef Bacik return ret; 48302351f431SJosef Bacik } 48312351f431SJosef Bacik 4832f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4833f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4834f46b5a66SChristoph Hellwig { 48350b246afaSJeff Mahoney struct inode *inode = file_inode(file); 48360b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 48370b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 48384bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4839f46b5a66SChristoph Hellwig 4840f46b5a66SChristoph Hellwig switch (cmd) { 48416cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 48426cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 48436cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 48446cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 48456cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 48466cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 484740cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4848b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 484940cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 485040cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4851f7039b1dSLi Dongyang case FITRIM: 4852b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4853f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4854fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4855fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4856fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 48573de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4858fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 48596f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 48606f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 486176dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4862949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4863949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4864949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 48650caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 48660caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 48670caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 48680caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 48696ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 48706ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4871f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 48721e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 48731e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 48741e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4875f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4876198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4877f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 48782ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 4879f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4880da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 48816b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 48826b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 4883475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 48842ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 4885475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 48862ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 4887f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 48889ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4889ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4890ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4891cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 4892cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 4893ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4894ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4895d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4896d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4897d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4898d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 4899d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 4900d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 49011406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 49022ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 49039b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 49049b199859SFilipe David Borba Manana int ret; 49059b199859SFilipe David Borba Manana 4906b4912139SJosef Bacik ret = btrfs_start_delalloc_roots(fs_info, U64_MAX); 49079b199859SFilipe David Borba Manana if (ret) 49089b199859SFilipe David Borba Manana return ret; 49090b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 49102fad4e83SDavid Sterba /* 49112fad4e83SDavid Sterba * The transaction thread may want to do more work, 491201327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 49132fad4e83SDavid Sterba * processing uncleaned subvols. 49142fad4e83SDavid Sterba */ 49150b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 49169b199859SFilipe David Borba Manana return ret; 49179b199859SFilipe David Borba Manana } 491846204592SSage Weil case BTRFS_IOC_START_SYNC: 49199a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 492046204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 49212ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 4922475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4923b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4924475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 49252ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 4926475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 49272ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 4928c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 49299ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4930837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 49312ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 493219a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 49332ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 49348ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 49358ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 4936abccd00fSHugo Mills #ifdef CONFIG_64BIT 4937abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 4938abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 4939abccd00fSHugo Mills #endif 494031db9f7cSAlexander Block case BTRFS_IOC_SEND: 49412351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, false); 49422351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 49432351f431SJosef Bacik case BTRFS_IOC_SEND_32: 49442351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, true); 49452351f431SJosef Bacik #endif 4946c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 49472ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 49485d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4949905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 49505d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4951905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 49525d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4953905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 49545d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4955905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 49562f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 49572f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 49582f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 4959b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 496057254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 4961b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 49623f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 49632ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 49642eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 4965d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 49662eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 4967b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 49682eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 49692eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 4970e4202ac9SDavid Sterba case FS_IOC_FSGETXATTR: 4971e4202ac9SDavid Sterba return btrfs_ioctl_fsgetxattr(file, argp); 4972025f2121SDavid Sterba case FS_IOC_FSSETXATTR: 4973025f2121SDavid Sterba return btrfs_ioctl_fssetxattr(file, argp); 4974b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 4975b64ec075STomohiro Misono return btrfs_ioctl_get_subvol_info(file, argp); 497642e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 497742e4b520STomohiro Misono return btrfs_ioctl_get_subvol_rootref(file, argp); 497823d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 497923d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 4980f46b5a66SChristoph Hellwig } 4981f46b5a66SChristoph Hellwig 4982f46b5a66SChristoph Hellwig return -ENOTTY; 4983f46b5a66SChristoph Hellwig } 49844c63c245SLuke Dashjr 49854c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 49864c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 49874c63c245SLuke Dashjr { 49882a362249SJeff Mahoney /* 49892a362249SJeff Mahoney * These all access 32-bit values anyway so no further 49902a362249SJeff Mahoney * handling is necessary. 49912a362249SJeff Mahoney */ 49924c63c245SLuke Dashjr switch (cmd) { 49934c63c245SLuke Dashjr case FS_IOC32_GETFLAGS: 49944c63c245SLuke Dashjr cmd = FS_IOC_GETFLAGS; 49954c63c245SLuke Dashjr break; 49964c63c245SLuke Dashjr case FS_IOC32_SETFLAGS: 49974c63c245SLuke Dashjr cmd = FS_IOC_SETFLAGS; 49984c63c245SLuke Dashjr break; 49994c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 50004c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 50014c63c245SLuke Dashjr break; 50024c63c245SLuke Dashjr } 50034c63c245SLuke Dashjr 50044c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 50054c63c245SLuke Dashjr } 50064c63c245SLuke Dashjr #endif 5007