1f46b5a66SChristoph Hellwig /* 2f46b5a66SChristoph Hellwig * Copyright (C) 2007 Oracle. All rights reserved. 3f46b5a66SChristoph Hellwig * 4f46b5a66SChristoph Hellwig * This program is free software; you can redistribute it and/or 5f46b5a66SChristoph Hellwig * modify it under the terms of the GNU General Public 6f46b5a66SChristoph Hellwig * License v2 as published by the Free Software Foundation. 7f46b5a66SChristoph Hellwig * 8f46b5a66SChristoph Hellwig * This program is distributed in the hope that it will be useful, 9f46b5a66SChristoph Hellwig * but WITHOUT ANY WARRANTY; without even the implied warranty of 10f46b5a66SChristoph Hellwig * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11f46b5a66SChristoph Hellwig * General Public License for more details. 12f46b5a66SChristoph Hellwig * 13f46b5a66SChristoph Hellwig * You should have received a copy of the GNU General Public 14f46b5a66SChristoph Hellwig * License along with this program; if not, write to the 15f46b5a66SChristoph Hellwig * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16f46b5a66SChristoph Hellwig * Boston, MA 021110-1307, USA. 17f46b5a66SChristoph Hellwig */ 18f46b5a66SChristoph Hellwig 19f46b5a66SChristoph Hellwig #include <linux/kernel.h> 20f46b5a66SChristoph Hellwig #include <linux/bio.h> 21f46b5a66SChristoph Hellwig #include <linux/buffer_head.h> 22f46b5a66SChristoph Hellwig #include <linux/file.h> 23f46b5a66SChristoph Hellwig #include <linux/fs.h> 24cb8e7090SChristoph Hellwig #include <linux/fsnotify.h> 25f46b5a66SChristoph Hellwig #include <linux/pagemap.h> 26f46b5a66SChristoph Hellwig #include <linux/highmem.h> 27f46b5a66SChristoph Hellwig #include <linux/time.h> 28f46b5a66SChristoph Hellwig #include <linux/init.h> 29f46b5a66SChristoph Hellwig #include <linux/string.h> 30f46b5a66SChristoph Hellwig #include <linux/backing-dev.h> 31cb8e7090SChristoph Hellwig #include <linux/mount.h> 32f46b5a66SChristoph Hellwig #include <linux/mpage.h> 33cb8e7090SChristoph Hellwig #include <linux/namei.h> 34f46b5a66SChristoph Hellwig #include <linux/swap.h> 35f46b5a66SChristoph Hellwig #include <linux/writeback.h> 36f46b5a66SChristoph Hellwig #include <linux/statfs.h> 37f46b5a66SChristoph Hellwig #include <linux/compat.h> 38f46b5a66SChristoph Hellwig #include <linux/bit_spinlock.h> 39cb8e7090SChristoph Hellwig #include <linux/security.h> 40f46b5a66SChristoph Hellwig #include <linux/xattr.h> 417ea394f1SYan Zheng #include <linux/vmalloc.h> 425a0e3ad6STejun Heo #include <linux/slab.h> 43f7039b1dSLi Dongyang #include <linux/blkdev.h> 448ea05e3aSAlexander Block #include <linux/uuid.h> 454b4e25f2SChris Mason #include "compat.h" 46f46b5a66SChristoph Hellwig #include "ctree.h" 47f46b5a66SChristoph Hellwig #include "disk-io.h" 48f46b5a66SChristoph Hellwig #include "transaction.h" 49f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 50f46b5a66SChristoph Hellwig #include "ioctl.h" 51f46b5a66SChristoph Hellwig #include "print-tree.h" 52f46b5a66SChristoph Hellwig #include "volumes.h" 53925baeddSChris Mason #include "locking.h" 54581bb050SLi Zefan #include "inode-map.h" 55d7728c96SJan Schmidt #include "backref.h" 56606686eeSJosef Bacik #include "rcu-string.h" 5731db9f7cSAlexander Block #include "send.h" 58f46b5a66SChristoph Hellwig 596cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 606cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 616cbff00fSChristoph Hellwig { 626cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 636cbff00fSChristoph Hellwig return flags; 646cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 656cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 666cbff00fSChristoph Hellwig else 676cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 686cbff00fSChristoph Hellwig } 69f46b5a66SChristoph Hellwig 706cbff00fSChristoph Hellwig /* 716cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 726cbff00fSChristoph Hellwig */ 736cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 746cbff00fSChristoph Hellwig { 756cbff00fSChristoph Hellwig unsigned int iflags = 0; 766cbff00fSChristoph Hellwig 776cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 786cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 796cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 806cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 816cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 826cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 836cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 846cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 856cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 866cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 876cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 886cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 89d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 90d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 91d0092bddSLi Zefan 92d0092bddSLi Zefan if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) 93d0092bddSLi Zefan iflags |= FS_COMPR_FL; 94d0092bddSLi Zefan else if (flags & BTRFS_INODE_NOCOMPRESS) 95d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 966cbff00fSChristoph Hellwig 976cbff00fSChristoph Hellwig return iflags; 986cbff00fSChristoph Hellwig } 996cbff00fSChristoph Hellwig 1006cbff00fSChristoph Hellwig /* 1016cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1026cbff00fSChristoph Hellwig */ 1036cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 1046cbff00fSChristoph Hellwig { 1056cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1066cbff00fSChristoph Hellwig 1076cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 1086cbff00fSChristoph Hellwig 1096cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 1106cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 1116cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1126cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1136cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1146cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1156cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1166cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1176cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1186cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1196cbff00fSChristoph Hellwig } 1206cbff00fSChristoph Hellwig 1216cbff00fSChristoph Hellwig /* 1226cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1236cbff00fSChristoph Hellwig * 124e27425d6SJosef Bacik * Currently only the compression flags and the cow flags are inherited. 1256cbff00fSChristoph Hellwig */ 1266cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1276cbff00fSChristoph Hellwig { 1280b4dcea5SChris Mason unsigned int flags; 1290b4dcea5SChris Mason 1300b4dcea5SChris Mason if (!dir) 1310b4dcea5SChris Mason return; 1320b4dcea5SChris Mason 1330b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1346cbff00fSChristoph Hellwig 135e27425d6SJosef Bacik if (flags & BTRFS_INODE_NOCOMPRESS) { 136e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; 137e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; 138e27425d6SJosef Bacik } else if (flags & BTRFS_INODE_COMPRESS) { 139e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; 140e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; 141e27425d6SJosef Bacik } 1426cbff00fSChristoph Hellwig 143e27425d6SJosef Bacik if (flags & BTRFS_INODE_NODATACOW) 144e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; 145e27425d6SJosef Bacik 1466cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1476cbff00fSChristoph Hellwig } 1486cbff00fSChristoph Hellwig 1496cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1506cbff00fSChristoph Hellwig { 1516cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); 1526cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1536cbff00fSChristoph Hellwig 1546cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1556cbff00fSChristoph Hellwig return -EFAULT; 1566cbff00fSChristoph Hellwig return 0; 1576cbff00fSChristoph Hellwig } 1586cbff00fSChristoph Hellwig 15975e7cb7fSLiu Bo static int check_flags(unsigned int flags) 16075e7cb7fSLiu Bo { 16175e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 16275e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 16375e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 164e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 165e1e8fb6aSLi Zefan FS_NOCOW_FL)) 16675e7cb7fSLiu Bo return -EOPNOTSUPP; 16775e7cb7fSLiu Bo 16875e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 16975e7cb7fSLiu Bo return -EINVAL; 17075e7cb7fSLiu Bo 17175e7cb7fSLiu Bo return 0; 17275e7cb7fSLiu Bo } 17375e7cb7fSLiu Bo 1746cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1756cbff00fSChristoph Hellwig { 1766cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 1776cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1786cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1796cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1806cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1816cbff00fSChristoph Hellwig int ret; 182f062abf0SLi Zefan u64 ip_oldflags; 183f062abf0SLi Zefan unsigned int i_oldflags; 1847e97b8daSDavid Sterba umode_t mode; 1856cbff00fSChristoph Hellwig 186b83cc969SLi Zefan if (btrfs_root_readonly(root)) 187b83cc969SLi Zefan return -EROFS; 188b83cc969SLi Zefan 1896cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1906cbff00fSChristoph Hellwig return -EFAULT; 1916cbff00fSChristoph Hellwig 19275e7cb7fSLiu Bo ret = check_flags(flags); 19375e7cb7fSLiu Bo if (ret) 19475e7cb7fSLiu Bo return ret; 1956cbff00fSChristoph Hellwig 1962e149670SSerge E. Hallyn if (!inode_owner_or_capable(inode)) 1976cbff00fSChristoph Hellwig return -EACCES; 1986cbff00fSChristoph Hellwig 199e7848683SJan Kara ret = mnt_want_write_file(file); 200e7848683SJan Kara if (ret) 201e7848683SJan Kara return ret; 202e7848683SJan Kara 2036cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 2046cbff00fSChristoph Hellwig 205f062abf0SLi Zefan ip_oldflags = ip->flags; 206f062abf0SLi Zefan i_oldflags = inode->i_flags; 2077e97b8daSDavid Sterba mode = inode->i_mode; 208f062abf0SLi Zefan 2096cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 2106cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 2116cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 2126cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 2136cbff00fSChristoph Hellwig ret = -EPERM; 2146cbff00fSChristoph Hellwig goto out_unlock; 2156cbff00fSChristoph Hellwig } 2166cbff00fSChristoph Hellwig } 2176cbff00fSChristoph Hellwig 2186cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 2196cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 2206cbff00fSChristoph Hellwig else 2216cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2226cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2236cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2246cbff00fSChristoph Hellwig else 2256cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2266cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2276cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2286cbff00fSChristoph Hellwig else 2296cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2306cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2316cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2326cbff00fSChristoph Hellwig else 2336cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2346cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2356cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2366cbff00fSChristoph Hellwig else 2376cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2386cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2396cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2406cbff00fSChristoph Hellwig else 2416cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2427e97b8daSDavid Sterba if (flags & FS_NOCOW_FL) { 2437e97b8daSDavid Sterba if (S_ISREG(mode)) { 2447e97b8daSDavid Sterba /* 2457e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2467e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2477e97b8daSDavid Sterba * status of the file and will not set it. 2487e97b8daSDavid Sterba */ 2497e97b8daSDavid Sterba if (inode->i_size == 0) 2507e97b8daSDavid Sterba ip->flags |= BTRFS_INODE_NODATACOW 2517e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM; 2527e97b8daSDavid Sterba } else { 253e1e8fb6aSLi Zefan ip->flags |= BTRFS_INODE_NODATACOW; 2547e97b8daSDavid Sterba } 2557e97b8daSDavid Sterba } else { 2567e97b8daSDavid Sterba /* 2577e97b8daSDavid Sterba * Revert back under same assuptions as above 2587e97b8daSDavid Sterba */ 2597e97b8daSDavid Sterba if (S_ISREG(mode)) { 2607e97b8daSDavid Sterba if (inode->i_size == 0) 2617e97b8daSDavid Sterba ip->flags &= ~(BTRFS_INODE_NODATACOW 2627e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM); 2637e97b8daSDavid Sterba } else { 264e1e8fb6aSLi Zefan ip->flags &= ~BTRFS_INODE_NODATACOW; 2657e97b8daSDavid Sterba } 2667e97b8daSDavid Sterba } 2676cbff00fSChristoph Hellwig 26875e7cb7fSLiu Bo /* 26975e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 27075e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 27175e7cb7fSLiu Bo * things smaller. 27275e7cb7fSLiu Bo */ 27375e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 27475e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 27575e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 27675e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 27775e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 27875e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 279ebcb904dSLi Zefan } else { 280ebcb904dSLi Zefan ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 28175e7cb7fSLiu Bo } 2826cbff00fSChristoph Hellwig 2834da6f1a3SLi Zefan trans = btrfs_start_transaction(root, 1); 284f062abf0SLi Zefan if (IS_ERR(trans)) { 285f062abf0SLi Zefan ret = PTR_ERR(trans); 286f062abf0SLi Zefan goto out_drop; 287f062abf0SLi Zefan } 2886cbff00fSChristoph Hellwig 289306424ccSLi Zefan btrfs_update_iflags(inode); 2900c4d2d95SJosef Bacik inode_inc_iversion(inode); 291306424ccSLi Zefan inode->i_ctime = CURRENT_TIME; 2926cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 2936cbff00fSChristoph Hellwig 2946cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 295f062abf0SLi Zefan out_drop: 296f062abf0SLi Zefan if (ret) { 297f062abf0SLi Zefan ip->flags = ip_oldflags; 298f062abf0SLi Zefan inode->i_flags = i_oldflags; 299f062abf0SLi Zefan } 3006cbff00fSChristoph Hellwig 3016cbff00fSChristoph Hellwig out_unlock: 3026cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 303e7848683SJan Kara mnt_drop_write_file(file); 3042d4e6f6aSliubo return ret; 3056cbff00fSChristoph Hellwig } 3066cbff00fSChristoph Hellwig 3076cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 3086cbff00fSChristoph Hellwig { 3096cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 3106cbff00fSChristoph Hellwig 3116cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 3126cbff00fSChristoph Hellwig } 313f46b5a66SChristoph Hellwig 314f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 315f7039b1dSLi Dongyang { 316815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(fdentry(file)->d_sb); 317f7039b1dSLi Dongyang struct btrfs_device *device; 318f7039b1dSLi Dongyang struct request_queue *q; 319f7039b1dSLi Dongyang struct fstrim_range range; 320f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 321f7039b1dSLi Dongyang u64 num_devices = 0; 322815745cfSAl Viro u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); 323f7039b1dSLi Dongyang int ret; 324f7039b1dSLi Dongyang 325f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 326f7039b1dSLi Dongyang return -EPERM; 327f7039b1dSLi Dongyang 3281f78160cSXiao Guangrong rcu_read_lock(); 3291f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 3301f78160cSXiao Guangrong dev_list) { 331f7039b1dSLi Dongyang if (!device->bdev) 332f7039b1dSLi Dongyang continue; 333f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 334f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 335f7039b1dSLi Dongyang num_devices++; 336f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 337f7039b1dSLi Dongyang minlen); 338f7039b1dSLi Dongyang } 339f7039b1dSLi Dongyang } 3401f78160cSXiao Guangrong rcu_read_unlock(); 341f4c697e6SLukas Czerner 342f7039b1dSLi Dongyang if (!num_devices) 343f7039b1dSLi Dongyang return -EOPNOTSUPP; 344f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 345f7039b1dSLi Dongyang return -EFAULT; 346f4c697e6SLukas Czerner if (range.start > total_bytes) 347f4c697e6SLukas Czerner return -EINVAL; 348f7039b1dSLi Dongyang 349f4c697e6SLukas Czerner range.len = min(range.len, total_bytes - range.start); 350f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 351815745cfSAl Viro ret = btrfs_trim_fs(fs_info->tree_root, &range); 352f7039b1dSLi Dongyang if (ret < 0) 353f7039b1dSLi Dongyang return ret; 354f7039b1dSLi Dongyang 355f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 356f7039b1dSLi Dongyang return -EFAULT; 357f7039b1dSLi Dongyang 358f7039b1dSLi Dongyang return 0; 359f7039b1dSLi Dongyang } 360f7039b1dSLi Dongyang 361cb8e7090SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, 362cb8e7090SChristoph Hellwig struct dentry *dentry, 36372fd032eSSage Weil char *name, int namelen, 3646f72c7e2SArne Jansen u64 *async_transid, 3656f72c7e2SArne Jansen struct btrfs_qgroup_inherit **inherit) 366f46b5a66SChristoph Hellwig { 367f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 368f46b5a66SChristoph Hellwig struct btrfs_key key; 369f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 370f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 371f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 37276dda93cSYan, Zheng struct btrfs_root *new_root; 3732fbe8c8aSAl Viro struct dentry *parent = dentry->d_parent; 3746a912213SJosef Bacik struct inode *dir; 3758ea05e3aSAlexander Block struct timespec cur_time = CURRENT_TIME; 376f46b5a66SChristoph Hellwig int ret; 377f46b5a66SChristoph Hellwig int err; 378f46b5a66SChristoph Hellwig u64 objectid; 379f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 3803de4586cSChris Mason u64 index = 0; 3818ea05e3aSAlexander Block uuid_le new_uuid; 382f46b5a66SChristoph Hellwig 383581bb050SLi Zefan ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); 3842fbe8c8aSAl Viro if (ret) 385a22285a6SYan, Zheng return ret; 3866a912213SJosef Bacik 3876a912213SJosef Bacik dir = parent->d_inode; 3886a912213SJosef Bacik 3899ed74f2dSJosef Bacik /* 3909ed74f2dSJosef Bacik * 1 - inode item 3919ed74f2dSJosef Bacik * 2 - refs 3929ed74f2dSJosef Bacik * 1 - root item 3939ed74f2dSJosef Bacik * 2 - dir items 3949ed74f2dSJosef Bacik */ 395a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 6); 3962fbe8c8aSAl Viro if (IS_ERR(trans)) 397a22285a6SYan, Zheng return PTR_ERR(trans); 398f46b5a66SChristoph Hellwig 3996f72c7e2SArne Jansen ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, 4006f72c7e2SArne Jansen inherit ? *inherit : NULL); 4016f72c7e2SArne Jansen if (ret) 4026f72c7e2SArne Jansen goto fail; 4036f72c7e2SArne Jansen 4045d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 4055581a51aSJan Schmidt 0, objectid, NULL, 0, 0, 0); 4068e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 4078e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 4088e8a1e31SJosef Bacik goto fail; 4098e8a1e31SJosef Bacik } 410f46b5a66SChristoph Hellwig 4115d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 412f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 413f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 4145d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 415f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 416f46b5a66SChristoph Hellwig 417f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 418f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 419f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 4205d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 4215d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 4225d4f98a2SYan Zheng BTRFS_UUID_SIZE); 423f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 424f46b5a66SChristoph Hellwig 4258ea05e3aSAlexander Block memset(&root_item, 0, sizeof(root_item)); 4268ea05e3aSAlexander Block 427f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 428f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 429f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 430f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 431a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 432f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 433f46b5a66SChristoph Hellwig 43408fe4db1SLi Zefan root_item.flags = 0; 43508fe4db1SLi Zefan root_item.byte_limit = 0; 43608fe4db1SLi Zefan inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT); 43708fe4db1SLi Zefan 438f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 43984234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 440f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 441f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 44286b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 44380ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 444f46b5a66SChristoph Hellwig 4458ea05e3aSAlexander Block btrfs_set_root_generation_v2(&root_item, 4468ea05e3aSAlexander Block btrfs_root_generation(&root_item)); 4478ea05e3aSAlexander Block uuid_le_gen(&new_uuid); 4488ea05e3aSAlexander Block memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); 4498ea05e3aSAlexander Block root_item.otime.sec = cpu_to_le64(cur_time.tv_sec); 450dadd1105SDan Carpenter root_item.otime.nsec = cpu_to_le32(cur_time.tv_nsec); 4518ea05e3aSAlexander Block root_item.ctime = root_item.otime; 4528ea05e3aSAlexander Block btrfs_set_root_ctransid(&root_item, trans->transid); 4538ea05e3aSAlexander Block btrfs_set_root_otransid(&root_item, trans->transid); 454f46b5a66SChristoph Hellwig 455925baeddSChris Mason btrfs_tree_unlock(leaf); 456f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 457f46b5a66SChristoph Hellwig leaf = NULL; 458f46b5a66SChristoph Hellwig 459f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 460f46b5a66SChristoph Hellwig 461f46b5a66SChristoph Hellwig key.objectid = objectid; 4625d4f98a2SYan Zheng key.offset = 0; 463f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 464f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 465f46b5a66SChristoph Hellwig &root_item); 466f46b5a66SChristoph Hellwig if (ret) 467f46b5a66SChristoph Hellwig goto fail; 468f46b5a66SChristoph Hellwig 46976dda93cSYan, Zheng key.offset = (u64)-1; 47076dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 47179787eaaSJeff Mahoney if (IS_ERR(new_root)) { 47279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); 47379787eaaSJeff Mahoney ret = PTR_ERR(new_root); 47479787eaaSJeff Mahoney goto fail; 47579787eaaSJeff Mahoney } 47676dda93cSYan, Zheng 47776dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 47876dda93cSYan, Zheng 479d82a6f1dSJosef Bacik ret = btrfs_create_subvol_root(trans, new_root, new_dirid); 480ce598979SMark Fasheh if (ret) { 481ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 48279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 483ce598979SMark Fasheh goto fail; 484ce598979SMark Fasheh } 485ce598979SMark Fasheh 486f46b5a66SChristoph Hellwig /* 487f46b5a66SChristoph Hellwig * insert the directory item 488f46b5a66SChristoph Hellwig */ 4893de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 49079787eaaSJeff Mahoney if (ret) { 49179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 49279787eaaSJeff Mahoney goto fail; 49379787eaaSJeff Mahoney } 4943de4586cSChris Mason 4953de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 49616cdcec7SMiao Xie name, namelen, dir, &key, 4973de4586cSChris Mason BTRFS_FT_DIR, index); 49879787eaaSJeff Mahoney if (ret) { 49979787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 500f46b5a66SChristoph Hellwig goto fail; 50179787eaaSJeff Mahoney } 5020660b5afSChris Mason 50352c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 50452c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 50552c26179SYan Zheng BUG_ON(ret); 50652c26179SYan Zheng 5070660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 5084df27c4dSYan, Zheng objectid, root->root_key.objectid, 50933345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 51076dda93cSYan, Zheng 5110660b5afSChris Mason BUG_ON(ret); 5120660b5afSChris Mason 51376dda93cSYan, Zheng d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 514f46b5a66SChristoph Hellwig fail: 51572fd032eSSage Weil if (async_transid) { 51672fd032eSSage Weil *async_transid = trans->transid; 51772fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 51872fd032eSSage Weil } else { 51976dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 52072fd032eSSage Weil } 521f46b5a66SChristoph Hellwig if (err && !ret) 522f46b5a66SChristoph Hellwig ret = err; 523f46b5a66SChristoph Hellwig return ret; 524f46b5a66SChristoph Hellwig } 525f46b5a66SChristoph Hellwig 52672fd032eSSage Weil static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 527b83cc969SLi Zefan char *name, int namelen, u64 *async_transid, 5286f72c7e2SArne Jansen bool readonly, struct btrfs_qgroup_inherit **inherit) 529f46b5a66SChristoph Hellwig { 5302e4bfab9SYan, Zheng struct inode *inode; 531f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 532f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 5332e4bfab9SYan, Zheng int ret; 534f46b5a66SChristoph Hellwig 535f46b5a66SChristoph Hellwig if (!root->ref_cows) 536f46b5a66SChristoph Hellwig return -EINVAL; 537f46b5a66SChristoph Hellwig 538a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 539a22285a6SYan, Zheng if (!pending_snapshot) 540a22285a6SYan, Zheng return -ENOMEM; 541a22285a6SYan, Zheng 54266d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 54366d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 544a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 545a22285a6SYan, Zheng pending_snapshot->root = root; 546b83cc969SLi Zefan pending_snapshot->readonly = readonly; 5476f72c7e2SArne Jansen if (inherit) { 5486f72c7e2SArne Jansen pending_snapshot->inherit = *inherit; 5496f72c7e2SArne Jansen *inherit = NULL; /* take responsibility to free it */ 5506f72c7e2SArne Jansen } 551a22285a6SYan, Zheng 55248c03c4bSMiao Xie trans = btrfs_start_transaction(root->fs_info->extent_root, 6); 553a22285a6SYan, Zheng if (IS_ERR(trans)) { 554a22285a6SYan, Zheng ret = PTR_ERR(trans); 555a22285a6SYan, Zheng goto fail; 556a22285a6SYan, Zheng } 557a22285a6SYan, Zheng 558a22285a6SYan, Zheng ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); 559a22285a6SYan, Zheng BUG_ON(ret); 560a22285a6SYan, Zheng 5618351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 562a22285a6SYan, Zheng list_add(&pending_snapshot->list, 563a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 5648351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 56572fd032eSSage Weil if (async_transid) { 56672fd032eSSage Weil *async_transid = trans->transid; 56772fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 56872fd032eSSage Weil root->fs_info->extent_root, 1); 56972fd032eSSage Weil } else { 57072fd032eSSage Weil ret = btrfs_commit_transaction(trans, 57172fd032eSSage Weil root->fs_info->extent_root); 57272fd032eSSage Weil } 573a22285a6SYan, Zheng BUG_ON(ret); 574a22285a6SYan, Zheng 575a22285a6SYan, Zheng ret = pending_snapshot->error; 576f46b5a66SChristoph Hellwig if (ret) 5772e4bfab9SYan, Zheng goto fail; 578f46b5a66SChristoph Hellwig 57966b4ffd1SJosef Bacik ret = btrfs_orphan_cleanup(pending_snapshot->snap); 58066b4ffd1SJosef Bacik if (ret) 58166b4ffd1SJosef Bacik goto fail; 582f46b5a66SChristoph Hellwig 5832fbe8c8aSAl Viro inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 5842e4bfab9SYan, Zheng if (IS_ERR(inode)) { 5852e4bfab9SYan, Zheng ret = PTR_ERR(inode); 5862e4bfab9SYan, Zheng goto fail; 5872e4bfab9SYan, Zheng } 5882e4bfab9SYan, Zheng BUG_ON(!inode); 5892e4bfab9SYan, Zheng d_instantiate(dentry, inode); 5902e4bfab9SYan, Zheng ret = 0; 5912e4bfab9SYan, Zheng fail: 592a22285a6SYan, Zheng kfree(pending_snapshot); 593f46b5a66SChristoph Hellwig return ret; 594f46b5a66SChristoph Hellwig } 595f46b5a66SChristoph Hellwig 5964260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 5974260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 5984260f7c7SSage Weil * minimal. 5994260f7c7SSage Weil */ 6004260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 6014260f7c7SSage Weil { 6022f2f43d3SEric W. Biederman kuid_t fsuid = current_fsuid(); 6034260f7c7SSage Weil 6044260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 6054260f7c7SSage Weil return 0; 6062f2f43d3SEric W. Biederman if (uid_eq(inode->i_uid, fsuid)) 6074260f7c7SSage Weil return 0; 6082f2f43d3SEric W. Biederman if (uid_eq(dir->i_uid, fsuid)) 6094260f7c7SSage Weil return 0; 6104260f7c7SSage Weil return !capable(CAP_FOWNER); 6114260f7c7SSage Weil } 6124260f7c7SSage Weil 6134260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 6144260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 6154260f7c7SSage Weil * whether the type of victim is right. 6164260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 6174260f7c7SSage Weil * 2. We should have write and exec permissions on dir 6184260f7c7SSage Weil * 3. We can't remove anything from append-only dir 6194260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 6204260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 6214260f7c7SSage Weil * a. be owner of dir, or 6224260f7c7SSage Weil * b. be owner of victim, or 6234260f7c7SSage Weil * c. have CAP_FOWNER capability 6244260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 6254260f7c7SSage Weil * links pointing to it. 6264260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 6274260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 6284260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 6294260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 6304260f7c7SSage Weil * nfs_async_unlink(). 6314260f7c7SSage Weil */ 6324260f7c7SSage Weil 6334260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) 6344260f7c7SSage Weil { 6354260f7c7SSage Weil int error; 6364260f7c7SSage Weil 6374260f7c7SSage Weil if (!victim->d_inode) 6384260f7c7SSage Weil return -ENOENT; 6394260f7c7SSage Weil 6404260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 6414fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 6424260f7c7SSage Weil 6434260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 6444260f7c7SSage Weil if (error) 6454260f7c7SSage Weil return error; 6464260f7c7SSage Weil if (IS_APPEND(dir)) 6474260f7c7SSage Weil return -EPERM; 6484260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 6494260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 6504260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 6514260f7c7SSage Weil return -EPERM; 6524260f7c7SSage Weil if (isdir) { 6534260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 6544260f7c7SSage Weil return -ENOTDIR; 6554260f7c7SSage Weil if (IS_ROOT(victim)) 6564260f7c7SSage Weil return -EBUSY; 6574260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 6584260f7c7SSage Weil return -EISDIR; 6594260f7c7SSage Weil if (IS_DEADDIR(dir)) 6604260f7c7SSage Weil return -ENOENT; 6614260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 6624260f7c7SSage Weil return -EBUSY; 6634260f7c7SSage Weil return 0; 6644260f7c7SSage Weil } 6654260f7c7SSage Weil 666cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 667cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 668cb8e7090SChristoph Hellwig { 669cb8e7090SChristoph Hellwig if (child->d_inode) 670cb8e7090SChristoph Hellwig return -EEXIST; 671cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 672cb8e7090SChristoph Hellwig return -ENOENT; 673cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 674cb8e7090SChristoph Hellwig } 675cb8e7090SChristoph Hellwig 676cb8e7090SChristoph Hellwig /* 677cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 678cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 679cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 680cb8e7090SChristoph Hellwig */ 68176dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 68276dda93cSYan, Zheng char *name, int namelen, 68372fd032eSSage Weil struct btrfs_root *snap_src, 6846f72c7e2SArne Jansen u64 *async_transid, bool readonly, 6856f72c7e2SArne Jansen struct btrfs_qgroup_inherit **inherit) 686cb8e7090SChristoph Hellwig { 68776dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 688cb8e7090SChristoph Hellwig struct dentry *dentry; 689cb8e7090SChristoph Hellwig int error; 690cb8e7090SChristoph Hellwig 69176dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 692cb8e7090SChristoph Hellwig 693cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 694cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 695cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 696cb8e7090SChristoph Hellwig goto out_unlock; 697cb8e7090SChristoph Hellwig 698cb8e7090SChristoph Hellwig error = -EEXIST; 699cb8e7090SChristoph Hellwig if (dentry->d_inode) 700cb8e7090SChristoph Hellwig goto out_dput; 701cb8e7090SChristoph Hellwig 70276dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 703cb8e7090SChristoph Hellwig if (error) 704a874a63eSLiu Bo goto out_dput; 705cb8e7090SChristoph Hellwig 70676dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 70776dda93cSYan, Zheng 70876dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 70976dda93cSYan, Zheng goto out_up_read; 71076dda93cSYan, Zheng 7113de4586cSChris Mason if (snap_src) { 7126f72c7e2SArne Jansen error = create_snapshot(snap_src, dentry, name, namelen, 7136f72c7e2SArne Jansen async_transid, readonly, inherit); 7143de4586cSChris Mason } else { 71576dda93cSYan, Zheng error = create_subvol(BTRFS_I(dir)->root, dentry, 7166f72c7e2SArne Jansen name, namelen, async_transid, inherit); 7173de4586cSChris Mason } 71876dda93cSYan, Zheng if (!error) 71976dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 72076dda93cSYan, Zheng out_up_read: 72176dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 722cb8e7090SChristoph Hellwig out_dput: 723cb8e7090SChristoph Hellwig dput(dentry); 724cb8e7090SChristoph Hellwig out_unlock: 72576dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 726cb8e7090SChristoph Hellwig return error; 727cb8e7090SChristoph Hellwig } 728cb8e7090SChristoph Hellwig 7294cb5300bSChris Mason /* 7304cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 7314cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 7324cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 7334cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 7344cb5300bSChris Mason * part of the file 7354cb5300bSChris Mason */ 7364cb5300bSChris Mason static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) 7374cb5300bSChris Mason { 7384cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 7394cb5300bSChris Mason struct extent_map *em = NULL; 7404cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 7414cb5300bSChris Mason u64 end; 7424cb5300bSChris Mason 7434cb5300bSChris Mason read_lock(&em_tree->lock); 7444cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 7454cb5300bSChris Mason read_unlock(&em_tree->lock); 7464cb5300bSChris Mason 7474cb5300bSChris Mason if (em) { 7484cb5300bSChris Mason end = extent_map_end(em); 7494cb5300bSChris Mason free_extent_map(em); 7504cb5300bSChris Mason if (end - offset > thresh) 7514cb5300bSChris Mason return 0; 7524cb5300bSChris Mason } 7534cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 7544cb5300bSChris Mason thresh /= 2; 7554cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 7564cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 7574cb5300bSChris Mason if (end >= thresh) 7584cb5300bSChris Mason return 0; 7594cb5300bSChris Mason return 1; 7604cb5300bSChris Mason } 7614cb5300bSChris Mason 7624cb5300bSChris Mason /* 7634cb5300bSChris Mason * helper function to walk through a file and find extents 7644cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 7654cb5300bSChris Mason * 7664cb5300bSChris Mason * This is used by the defragging code to find new and small 7674cb5300bSChris Mason * extents 7684cb5300bSChris Mason */ 7694cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 7704cb5300bSChris Mason struct inode *inode, u64 newer_than, 7714cb5300bSChris Mason u64 *off, int thresh) 7724cb5300bSChris Mason { 7734cb5300bSChris Mason struct btrfs_path *path; 7744cb5300bSChris Mason struct btrfs_key min_key; 7754cb5300bSChris Mason struct btrfs_key max_key; 7764cb5300bSChris Mason struct extent_buffer *leaf; 7774cb5300bSChris Mason struct btrfs_file_extent_item *extent; 7784cb5300bSChris Mason int type; 7794cb5300bSChris Mason int ret; 780a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 7814cb5300bSChris Mason 7824cb5300bSChris Mason path = btrfs_alloc_path(); 7834cb5300bSChris Mason if (!path) 7844cb5300bSChris Mason return -ENOMEM; 7854cb5300bSChris Mason 786a4689d2bSDavid Sterba min_key.objectid = ino; 7874cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 7884cb5300bSChris Mason min_key.offset = *off; 7894cb5300bSChris Mason 790a4689d2bSDavid Sterba max_key.objectid = ino; 7914cb5300bSChris Mason max_key.type = (u8)-1; 7924cb5300bSChris Mason max_key.offset = (u64)-1; 7934cb5300bSChris Mason 7944cb5300bSChris Mason path->keep_locks = 1; 7954cb5300bSChris Mason 7964cb5300bSChris Mason while(1) { 7974cb5300bSChris Mason ret = btrfs_search_forward(root, &min_key, &max_key, 7984cb5300bSChris Mason path, 0, newer_than); 7994cb5300bSChris Mason if (ret != 0) 8004cb5300bSChris Mason goto none; 801a4689d2bSDavid Sterba if (min_key.objectid != ino) 8024cb5300bSChris Mason goto none; 8034cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 8044cb5300bSChris Mason goto none; 8054cb5300bSChris Mason 8064cb5300bSChris Mason leaf = path->nodes[0]; 8074cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 8084cb5300bSChris Mason struct btrfs_file_extent_item); 8094cb5300bSChris Mason 8104cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 8114cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 8124cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 8134cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 8144cb5300bSChris Mason *off = min_key.offset; 8154cb5300bSChris Mason btrfs_free_path(path); 8164cb5300bSChris Mason return 0; 8174cb5300bSChris Mason } 8184cb5300bSChris Mason 8194cb5300bSChris Mason if (min_key.offset == (u64)-1) 8204cb5300bSChris Mason goto none; 8214cb5300bSChris Mason 8224cb5300bSChris Mason min_key.offset++; 8234cb5300bSChris Mason btrfs_release_path(path); 8244cb5300bSChris Mason } 8254cb5300bSChris Mason none: 8264cb5300bSChris Mason btrfs_free_path(path); 8274cb5300bSChris Mason return -ENOENT; 8284cb5300bSChris Mason } 8294cb5300bSChris Mason 8306c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 83117ce6ef8SLiu Bo { 83217ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 833940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8346c282eb4SLi Zefan struct extent_map *em; 8356c282eb4SLi Zefan u64 len = PAGE_CACHE_SIZE; 836940100a4SChris Mason 837940100a4SChris Mason /* 838940100a4SChris Mason * hopefully we have this extent in the tree already, try without 839940100a4SChris Mason * the full extent lock 840940100a4SChris Mason */ 841940100a4SChris Mason read_lock(&em_tree->lock); 842940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 843940100a4SChris Mason read_unlock(&em_tree->lock); 844940100a4SChris Mason 845940100a4SChris Mason if (!em) { 846940100a4SChris Mason /* get the big lock and read metadata off disk */ 847d0082371SJeff Mahoney lock_extent(io_tree, start, start + len - 1); 848940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 849d0082371SJeff Mahoney unlock_extent(io_tree, start, start + len - 1); 850940100a4SChris Mason 8516cf8bfbfSDan Carpenter if (IS_ERR(em)) 8526c282eb4SLi Zefan return NULL; 853940100a4SChris Mason } 854940100a4SChris Mason 8556c282eb4SLi Zefan return em; 8566c282eb4SLi Zefan } 8576c282eb4SLi Zefan 8586c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 8596c282eb4SLi Zefan { 8606c282eb4SLi Zefan struct extent_map *next; 8616c282eb4SLi Zefan bool ret = true; 8626c282eb4SLi Zefan 8636c282eb4SLi Zefan /* this is the last extent */ 8646c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 8656c282eb4SLi Zefan return false; 8666c282eb4SLi Zefan 8676c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 8686c282eb4SLi Zefan if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 8696c282eb4SLi Zefan ret = false; 8706c282eb4SLi Zefan 8716c282eb4SLi Zefan free_extent_map(next); 8726c282eb4SLi Zefan return ret; 8736c282eb4SLi Zefan } 8746c282eb4SLi Zefan 8756c282eb4SLi Zefan static int should_defrag_range(struct inode *inode, u64 start, int thresh, 876a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 877a43a2111SAndrew Mahone int compress) 8786c282eb4SLi Zefan { 8796c282eb4SLi Zefan struct extent_map *em; 8806c282eb4SLi Zefan int ret = 1; 8816c282eb4SLi Zefan bool next_mergeable = true; 8826c282eb4SLi Zefan 8836c282eb4SLi Zefan /* 8846c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 8856c282eb4SLi Zefan * defragging it 8866c282eb4SLi Zefan */ 8876c282eb4SLi Zefan if (start < *defrag_end) 8886c282eb4SLi Zefan return 1; 8896c282eb4SLi Zefan 8906c282eb4SLi Zefan *skip = 0; 8916c282eb4SLi Zefan 8926c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 8936c282eb4SLi Zefan if (!em) 8946c282eb4SLi Zefan return 0; 8956c282eb4SLi Zefan 896940100a4SChris Mason /* this will cover holes, and inline extents */ 89717ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 898940100a4SChris Mason ret = 0; 89917ce6ef8SLiu Bo goto out; 90017ce6ef8SLiu Bo } 90117ce6ef8SLiu Bo 9026c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 903940100a4SChris Mason 904940100a4SChris Mason /* 9056c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 9066c282eb4SLi Zefan * real extent, don't bother defragging it 907940100a4SChris Mason */ 908a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 9096c282eb4SLi Zefan (em->len >= thresh || !next_mergeable)) 910940100a4SChris Mason ret = 0; 91117ce6ef8SLiu Bo out: 912940100a4SChris Mason /* 913940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 914940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 915940100a4SChris Mason * so that the next tiny extent will force a defrag. 916940100a4SChris Mason * 917940100a4SChris Mason * The end result of this is that tiny extents before a single big 918940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 919940100a4SChris Mason */ 920940100a4SChris Mason if (ret) { 921940100a4SChris Mason *defrag_end = extent_map_end(em); 922940100a4SChris Mason } else { 923940100a4SChris Mason *last_len = 0; 924940100a4SChris Mason *skip = extent_map_end(em); 925940100a4SChris Mason *defrag_end = 0; 926940100a4SChris Mason } 927940100a4SChris Mason 928940100a4SChris Mason free_extent_map(em); 929940100a4SChris Mason return ret; 930940100a4SChris Mason } 931940100a4SChris Mason 9324cb5300bSChris Mason /* 9334cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 9344cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 9354cb5300bSChris Mason * to COW and defrag. 9364cb5300bSChris Mason * 9374cb5300bSChris Mason * It also makes sure the delalloc code has enough 9384cb5300bSChris Mason * dirty data to avoid making new small extents as part 9394cb5300bSChris Mason * of the defrag 9404cb5300bSChris Mason * 9414cb5300bSChris Mason * It's a good idea to start RA on this range 9424cb5300bSChris Mason * before calling this. 9434cb5300bSChris Mason */ 9444cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 9454cb5300bSChris Mason struct page **pages, 9464cb5300bSChris Mason unsigned long start_index, 9474cb5300bSChris Mason int num_pages) 948f46b5a66SChristoph Hellwig { 9494cb5300bSChris Mason unsigned long file_end; 9504cb5300bSChris Mason u64 isize = i_size_read(inode); 951f46b5a66SChristoph Hellwig u64 page_start; 952f46b5a66SChristoph Hellwig u64 page_end; 9531f12bd06SLiu Bo u64 page_cnt; 9544cb5300bSChris Mason int ret; 9554cb5300bSChris Mason int i; 9564cb5300bSChris Mason int i_done; 9574cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 9584cb5300bSChris Mason struct extent_state *cached_state = NULL; 959600a45e1SMiao Xie struct extent_io_tree *tree; 9603b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 9614cb5300bSChris Mason 9624cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 9631f12bd06SLiu Bo if (!isize || start_index > file_end) 9641f12bd06SLiu Bo return 0; 9651f12bd06SLiu Bo 9661f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 9674cb5300bSChris Mason 9684cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 9691f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 9704cb5300bSChris Mason if (ret) 9714cb5300bSChris Mason return ret; 9724cb5300bSChris Mason i_done = 0; 973600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 9744cb5300bSChris Mason 9754cb5300bSChris Mason /* step one, lock all the pages */ 9761f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 9774cb5300bSChris Mason struct page *page; 978600a45e1SMiao Xie again: 979a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 9803b16a4e3SJosef Bacik start_index + i, mask); 9814cb5300bSChris Mason if (!page) 9824cb5300bSChris Mason break; 9834cb5300bSChris Mason 984600a45e1SMiao Xie page_start = page_offset(page); 985600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 986600a45e1SMiao Xie while (1) { 987d0082371SJeff Mahoney lock_extent(tree, page_start, page_end); 988600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 989600a45e1SMiao Xie page_start); 990d0082371SJeff Mahoney unlock_extent(tree, page_start, page_end); 991600a45e1SMiao Xie if (!ordered) 992600a45e1SMiao Xie break; 993600a45e1SMiao Xie 994600a45e1SMiao Xie unlock_page(page); 995600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 996600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 997600a45e1SMiao Xie lock_page(page); 9981f12bd06SLiu Bo /* 9991f12bd06SLiu Bo * we unlocked the page above, so we need check if 10001f12bd06SLiu Bo * it was released or not. 10011f12bd06SLiu Bo */ 10021f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 10031f12bd06SLiu Bo unlock_page(page); 10041f12bd06SLiu Bo page_cache_release(page); 10051f12bd06SLiu Bo goto again; 10061f12bd06SLiu Bo } 1007600a45e1SMiao Xie } 1008600a45e1SMiao Xie 10094cb5300bSChris Mason if (!PageUptodate(page)) { 10104cb5300bSChris Mason btrfs_readpage(NULL, page); 10114cb5300bSChris Mason lock_page(page); 10124cb5300bSChris Mason if (!PageUptodate(page)) { 10134cb5300bSChris Mason unlock_page(page); 10144cb5300bSChris Mason page_cache_release(page); 10154cb5300bSChris Mason ret = -EIO; 10164cb5300bSChris Mason break; 10174cb5300bSChris Mason } 10184cb5300bSChris Mason } 1019600a45e1SMiao Xie 1020600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1021600a45e1SMiao Xie unlock_page(page); 1022600a45e1SMiao Xie page_cache_release(page); 1023600a45e1SMiao Xie goto again; 1024600a45e1SMiao Xie } 1025600a45e1SMiao Xie 10264cb5300bSChris Mason pages[i] = page; 10274cb5300bSChris Mason i_done++; 10284cb5300bSChris Mason } 10294cb5300bSChris Mason if (!i_done || ret) 10304cb5300bSChris Mason goto out; 10314cb5300bSChris Mason 10324cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 10334cb5300bSChris Mason goto out; 10344cb5300bSChris Mason 10354cb5300bSChris Mason /* 10364cb5300bSChris Mason * so now we have a nice long stream of locked 10374cb5300bSChris Mason * and up to date pages, lets wait on them 10384cb5300bSChris Mason */ 10394cb5300bSChris Mason for (i = 0; i < i_done; i++) 10404cb5300bSChris Mason wait_on_page_writeback(pages[i]); 10414cb5300bSChris Mason 10424cb5300bSChris Mason page_start = page_offset(pages[0]); 10434cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 10444cb5300bSChris Mason 10454cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1046d0082371SJeff Mahoney page_start, page_end - 1, 0, &cached_state); 10474cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 10484cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 10499e8a4a8bSLiu Bo EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, 10509e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 10514cb5300bSChris Mason 10521f12bd06SLiu Bo if (i_done != page_cnt) { 10539e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 10549e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 10559e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 10564cb5300bSChris Mason btrfs_delalloc_release_space(inode, 10571f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 10584cb5300bSChris Mason } 10594cb5300bSChris Mason 10604cb5300bSChris Mason 10619e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 10629e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 10634cb5300bSChris Mason 10644cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 10654cb5300bSChris Mason page_start, page_end - 1, &cached_state, 10664cb5300bSChris Mason GFP_NOFS); 10674cb5300bSChris Mason 10684cb5300bSChris Mason for (i = 0; i < i_done; i++) { 10694cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 10704cb5300bSChris Mason ClearPageChecked(pages[i]); 10714cb5300bSChris Mason set_page_extent_mapped(pages[i]); 10724cb5300bSChris Mason set_page_dirty(pages[i]); 10734cb5300bSChris Mason unlock_page(pages[i]); 10744cb5300bSChris Mason page_cache_release(pages[i]); 10754cb5300bSChris Mason } 10764cb5300bSChris Mason return i_done; 10774cb5300bSChris Mason out: 10784cb5300bSChris Mason for (i = 0; i < i_done; i++) { 10794cb5300bSChris Mason unlock_page(pages[i]); 10804cb5300bSChris Mason page_cache_release(pages[i]); 10814cb5300bSChris Mason } 10821f12bd06SLiu Bo btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); 10834cb5300bSChris Mason return ret; 10844cb5300bSChris Mason 10854cb5300bSChris Mason } 10864cb5300bSChris Mason 10874cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 10884cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 10894cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 10904cb5300bSChris Mason { 10914cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 10924cb5300bSChris Mason struct file_ra_state *ra = NULL; 10934cb5300bSChris Mason unsigned long last_index; 1094151a31b2SLi Zefan u64 isize = i_size_read(inode); 1095940100a4SChris Mason u64 last_len = 0; 1096940100a4SChris Mason u64 skip = 0; 1097940100a4SChris Mason u64 defrag_end = 0; 10984cb5300bSChris Mason u64 newer_off = range->start; 1099f46b5a66SChristoph Hellwig unsigned long i; 1100008873eaSLi Zefan unsigned long ra_index = 0; 1101f46b5a66SChristoph Hellwig int ret; 11024cb5300bSChris Mason int defrag_count = 0; 11031a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 11044cb5300bSChris Mason int extent_thresh = range->extent_thresh; 1105008873eaSLi Zefan int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; 1106008873eaSLi Zefan int cluster = max_cluster; 11074cb5300bSChris Mason u64 new_align = ~((u64)128 * 1024 - 1); 11084cb5300bSChris Mason struct page **pages = NULL; 11094cb5300bSChris Mason 11104cb5300bSChris Mason if (extent_thresh == 0) 11114cb5300bSChris Mason extent_thresh = 256 * 1024; 11121a419d85SLi Zefan 11131a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 11141a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 11151a419d85SLi Zefan return -EINVAL; 11161a419d85SLi Zefan if (range->compress_type) 11171a419d85SLi Zefan compress_type = range->compress_type; 11181a419d85SLi Zefan } 1119f46b5a66SChristoph Hellwig 1120151a31b2SLi Zefan if (isize == 0) 1121940100a4SChris Mason return 0; 1122f46b5a66SChristoph Hellwig 11234cb5300bSChris Mason /* 11244cb5300bSChris Mason * if we were not given a file, allocate a readahead 11254cb5300bSChris Mason * context 11264cb5300bSChris Mason */ 11274cb5300bSChris Mason if (!file) { 11284cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 11294cb5300bSChris Mason if (!ra) 11304cb5300bSChris Mason return -ENOMEM; 11314cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 11324cb5300bSChris Mason } else { 11334cb5300bSChris Mason ra = &file->f_ra; 11344cb5300bSChris Mason } 11354cb5300bSChris Mason 1136008873eaSLi Zefan pages = kmalloc(sizeof(struct page *) * max_cluster, 11374cb5300bSChris Mason GFP_NOFS); 11384cb5300bSChris Mason if (!pages) { 11394cb5300bSChris Mason ret = -ENOMEM; 11404cb5300bSChris Mason goto out_ra; 11414cb5300bSChris Mason } 11424cb5300bSChris Mason 11434cb5300bSChris Mason /* find the last page to defrag */ 11441e701a32SChris Mason if (range->start + range->len > range->start) { 1145151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 11461e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 11471e701a32SChris Mason } else { 1148151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 11491e701a32SChris Mason } 11501e701a32SChris Mason 11514cb5300bSChris Mason if (newer_than) { 11524cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 11534cb5300bSChris Mason &newer_off, 64 * 1024); 11544cb5300bSChris Mason if (!ret) { 11554cb5300bSChris Mason range->start = newer_off; 11564cb5300bSChris Mason /* 11574cb5300bSChris Mason * we always align our defrag to help keep 11584cb5300bSChris Mason * the extents in the file evenly spaced 11594cb5300bSChris Mason */ 11604cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 11614cb5300bSChris Mason } else 11624cb5300bSChris Mason goto out_ra; 11634cb5300bSChris Mason } else { 11641e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 11654cb5300bSChris Mason } 11664cb5300bSChris Mason if (!max_to_defrag) 11677ec31b54SLiu Bo max_to_defrag = last_index + 1; 11684cb5300bSChris Mason 11692a0f7f57SLi Zefan /* 11702a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 11712a0f7f57SLi Zefan * written sequentially. 11722a0f7f57SLi Zefan */ 11732a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 11742a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 11752a0f7f57SLi Zefan 1176f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1177f7f43cc8SChris Mason (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> 1178f7f43cc8SChris Mason PAGE_CACHE_SHIFT)) { 11794cb5300bSChris Mason /* 11804cb5300bSChris Mason * make sure we stop running if someone unmounts 11814cb5300bSChris Mason * the FS 11824cb5300bSChris Mason */ 11834cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 11844cb5300bSChris Mason break; 11854cb5300bSChris Mason 118666c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 11876c282eb4SLi Zefan extent_thresh, &last_len, &skip, 1188a43a2111SAndrew Mahone &defrag_end, range->flags & 1189a43a2111SAndrew Mahone BTRFS_DEFRAG_RANGE_COMPRESS)) { 1190940100a4SChris Mason unsigned long next; 1191940100a4SChris Mason /* 1192940100a4SChris Mason * the should_defrag function tells us how much to skip 1193940100a4SChris Mason * bump our counter by the suggested amount 1194940100a4SChris Mason */ 1195940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 1196940100a4SChris Mason i = max(i + 1, next); 1197940100a4SChris Mason continue; 1198940100a4SChris Mason } 1199008873eaSLi Zefan 1200008873eaSLi Zefan if (!newer_than) { 1201008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1202008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1203008873eaSLi Zefan cluster = min(cluster, max_cluster); 1204008873eaSLi Zefan } else { 1205008873eaSLi Zefan cluster = max_cluster; 1206008873eaSLi Zefan } 1207008873eaSLi Zefan 12081e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 12091a419d85SLi Zefan BTRFS_I(inode)->force_compress = compress_type; 1210940100a4SChris Mason 1211008873eaSLi Zefan if (i + cluster > ra_index) { 1212008873eaSLi Zefan ra_index = max(i, ra_index); 1213008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1214008873eaSLi Zefan cluster); 1215008873eaSLi Zefan ra_index += max_cluster; 1216008873eaSLi Zefan } 12174cb5300bSChris Mason 1218ecb8bea8SLiu Bo mutex_lock(&inode->i_mutex); 1219008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1220ecb8bea8SLiu Bo if (ret < 0) { 1221ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 12224cb5300bSChris Mason goto out_ra; 1223ecb8bea8SLiu Bo } 12244cb5300bSChris Mason 12254cb5300bSChris Mason defrag_count += ret; 12264cb5300bSChris Mason balance_dirty_pages_ratelimited_nr(inode->i_mapping, ret); 1227ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 12284cb5300bSChris Mason 12294cb5300bSChris Mason if (newer_than) { 12304cb5300bSChris Mason if (newer_off == (u64)-1) 12314cb5300bSChris Mason break; 12324cb5300bSChris Mason 1233e1f041e1SLiu Bo if (ret > 0) 1234e1f041e1SLiu Bo i += ret; 1235e1f041e1SLiu Bo 12364cb5300bSChris Mason newer_off = max(newer_off + 1, 12374cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 12384cb5300bSChris Mason 12394cb5300bSChris Mason ret = find_new_extents(root, inode, 12404cb5300bSChris Mason newer_than, &newer_off, 12414cb5300bSChris Mason 64 * 1024); 12424cb5300bSChris Mason if (!ret) { 12434cb5300bSChris Mason range->start = newer_off; 12444cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 12454cb5300bSChris Mason } else { 12464cb5300bSChris Mason break; 1247940100a4SChris Mason } 12484cb5300bSChris Mason } else { 1249008873eaSLi Zefan if (ret > 0) { 1250cbcc8326SLi Zefan i += ret; 1251008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1252008873eaSLi Zefan } else { 1253940100a4SChris Mason i++; 1254008873eaSLi Zefan last_len = 0; 1255008873eaSLi Zefan } 1256f46b5a66SChristoph Hellwig } 12574cb5300bSChris Mason } 1258f46b5a66SChristoph Hellwig 12591e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 12601e701a32SChris Mason filemap_flush(inode->i_mapping); 12611e701a32SChris Mason 12621e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 12631e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 12641e701a32SChris Mason * we have to make sure the IO is actually started and that 12651e701a32SChris Mason * ordered extents get created before we return 12661e701a32SChris Mason */ 12671e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 12681e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 12691e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 12701e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 12711e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 12721e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 12731e701a32SChris Mason } 12741e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 12751e701a32SChris Mason 12761e701a32SChris Mason mutex_lock(&inode->i_mutex); 1277261507a0SLi Zefan BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 12781e701a32SChris Mason mutex_unlock(&inode->i_mutex); 12791e701a32SChris Mason } 12801e701a32SChris Mason 12811a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 12822b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); 12831a419d85SLi Zefan } 12841a419d85SLi Zefan 128560ccf82fSDiego Calleja ret = defrag_count; 1286940100a4SChris Mason 12874cb5300bSChris Mason out_ra: 12884cb5300bSChris Mason if (!file) 12894cb5300bSChris Mason kfree(ra); 12904cb5300bSChris Mason kfree(pages); 1291940100a4SChris Mason return ret; 1292f46b5a66SChristoph Hellwig } 1293f46b5a66SChristoph Hellwig 129476dda93cSYan, Zheng static noinline int btrfs_ioctl_resize(struct btrfs_root *root, 129576dda93cSYan, Zheng void __user *arg) 1296f46b5a66SChristoph Hellwig { 1297f46b5a66SChristoph Hellwig u64 new_size; 1298f46b5a66SChristoph Hellwig u64 old_size; 1299f46b5a66SChristoph Hellwig u64 devid = 1; 1300f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1301f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1302f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1303f46b5a66SChristoph Hellwig char *sizestr; 1304f46b5a66SChristoph Hellwig char *devstr = NULL; 1305f46b5a66SChristoph Hellwig int ret = 0; 1306f46b5a66SChristoph Hellwig int mod = 0; 1307f46b5a66SChristoph Hellwig 1308c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1309c146afadSYan Zheng return -EROFS; 1310c146afadSYan Zheng 1311e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1312e441d54dSChris Mason return -EPERM; 1313e441d54dSChris Mason 1314c9e9f97bSIlya Dryomov mutex_lock(&root->fs_info->volume_mutex); 1315c9e9f97bSIlya Dryomov if (root->fs_info->balance_ctl) { 1316c9e9f97bSIlya Dryomov printk(KERN_INFO "btrfs: balance in progress\n"); 1317c9e9f97bSIlya Dryomov ret = -EINVAL; 1318c9e9f97bSIlya Dryomov goto out; 1319c9e9f97bSIlya Dryomov } 1320c9e9f97bSIlya Dryomov 1321dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1322c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1323c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1324c9e9f97bSIlya Dryomov goto out; 1325c9e9f97bSIlya Dryomov } 13265516e595SMark Fasheh 13275516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1328f46b5a66SChristoph Hellwig 1329f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1330f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1331f46b5a66SChristoph Hellwig if (devstr) { 1332f46b5a66SChristoph Hellwig char *end; 1333f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1334f46b5a66SChristoph Hellwig *devstr = '\0'; 1335f46b5a66SChristoph Hellwig devstr = vol_args->name; 1336f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 13375bb14682SArnd Hannemann printk(KERN_INFO "btrfs: resizing devid %llu\n", 133821380931SJoel Becker (unsigned long long)devid); 1339f46b5a66SChristoph Hellwig } 13402b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 1341f46b5a66SChristoph Hellwig if (!device) { 13425bb14682SArnd Hannemann printk(KERN_INFO "btrfs: resizer unable to find device %llu\n", 134321380931SJoel Becker (unsigned long long)devid); 1344f46b5a66SChristoph Hellwig ret = -EINVAL; 1345c9e9f97bSIlya Dryomov goto out_free; 1346f46b5a66SChristoph Hellwig } 13474e42ae1bSLiu Bo if (device->fs_devices && device->fs_devices->seeding) { 13484e42ae1bSLiu Bo printk(KERN_INFO "btrfs: resizer unable to apply on " 1349a8c4a33bSChris Mason "seeding device %llu\n", 1350a8c4a33bSChris Mason (unsigned long long)devid); 13514e42ae1bSLiu Bo ret = -EINVAL; 13524e42ae1bSLiu Bo goto out_free; 13534e42ae1bSLiu Bo } 13544e42ae1bSLiu Bo 1355f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1356f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1357f46b5a66SChristoph Hellwig else { 1358f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1359f46b5a66SChristoph Hellwig mod = -1; 1360f46b5a66SChristoph Hellwig sizestr++; 1361f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1362f46b5a66SChristoph Hellwig mod = 1; 1363f46b5a66SChristoph Hellwig sizestr++; 1364f46b5a66SChristoph Hellwig } 136591748467SAkinobu Mita new_size = memparse(sizestr, NULL); 1366f46b5a66SChristoph Hellwig if (new_size == 0) { 1367f46b5a66SChristoph Hellwig ret = -EINVAL; 1368c9e9f97bSIlya Dryomov goto out_free; 1369f46b5a66SChristoph Hellwig } 1370f46b5a66SChristoph Hellwig } 1371f46b5a66SChristoph Hellwig 1372f46b5a66SChristoph Hellwig old_size = device->total_bytes; 1373f46b5a66SChristoph Hellwig 1374f46b5a66SChristoph Hellwig if (mod < 0) { 1375f46b5a66SChristoph Hellwig if (new_size > old_size) { 1376f46b5a66SChristoph Hellwig ret = -EINVAL; 1377c9e9f97bSIlya Dryomov goto out_free; 1378f46b5a66SChristoph Hellwig } 1379f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1380f46b5a66SChristoph Hellwig } else if (mod > 0) { 1381f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1382f46b5a66SChristoph Hellwig } 1383f46b5a66SChristoph Hellwig 1384f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 1385f46b5a66SChristoph Hellwig ret = -EINVAL; 1386c9e9f97bSIlya Dryomov goto out_free; 1387f46b5a66SChristoph Hellwig } 1388f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1389f46b5a66SChristoph Hellwig ret = -EFBIG; 1390c9e9f97bSIlya Dryomov goto out_free; 1391f46b5a66SChristoph Hellwig } 1392f46b5a66SChristoph Hellwig 1393f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 1394f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1395f46b5a66SChristoph Hellwig 1396606686eeSJosef Bacik printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n", 1397606686eeSJosef Bacik rcu_str_deref(device->name), 1398606686eeSJosef Bacik (unsigned long long)new_size); 1399f46b5a66SChristoph Hellwig 1400f46b5a66SChristoph Hellwig if (new_size > old_size) { 1401a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 140298d5dc13STsutomu Itoh if (IS_ERR(trans)) { 140398d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1404c9e9f97bSIlya Dryomov goto out_free; 140598d5dc13STsutomu Itoh } 1406f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1407f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1408ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1409f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 1410f46b5a66SChristoph Hellwig } 1411f46b5a66SChristoph Hellwig 1412c9e9f97bSIlya Dryomov out_free: 1413f46b5a66SChristoph Hellwig kfree(vol_args); 1414c9e9f97bSIlya Dryomov out: 1415c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 1416f46b5a66SChristoph Hellwig return ret; 1417f46b5a66SChristoph Hellwig } 1418f46b5a66SChristoph Hellwig 141972fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 14206f72c7e2SArne Jansen char *name, unsigned long fd, int subvol, 14216f72c7e2SArne Jansen u64 *transid, bool readonly, 14226f72c7e2SArne Jansen struct btrfs_qgroup_inherit **inherit) 1423f46b5a66SChristoph Hellwig { 1424f46b5a66SChristoph Hellwig int namelen; 14253de4586cSChris Mason int ret = 0; 1426f46b5a66SChristoph Hellwig 1427a874a63eSLiu Bo ret = mnt_want_write_file(file); 1428a874a63eSLiu Bo if (ret) 1429a874a63eSLiu Bo goto out; 1430a874a63eSLiu Bo 143172fd032eSSage Weil namelen = strlen(name); 143272fd032eSSage Weil if (strchr(name, '/')) { 1433f46b5a66SChristoph Hellwig ret = -EINVAL; 1434a874a63eSLiu Bo goto out_drop_write; 1435f46b5a66SChristoph Hellwig } 1436f46b5a66SChristoph Hellwig 143716780cabSChris Mason if (name[0] == '.' && 143816780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 143916780cabSChris Mason ret = -EEXIST; 1440a874a63eSLiu Bo goto out_drop_write; 144116780cabSChris Mason } 144216780cabSChris Mason 14433de4586cSChris Mason if (subvol) { 144472fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 14456f72c7e2SArne Jansen NULL, transid, readonly, inherit); 1446cb8e7090SChristoph Hellwig } else { 14472903ff01SAl Viro struct fd src = fdget(fd); 14483de4586cSChris Mason struct inode *src_inode; 14492903ff01SAl Viro if (!src.file) { 14503de4586cSChris Mason ret = -EINVAL; 1451a874a63eSLiu Bo goto out_drop_write; 14523de4586cSChris Mason } 14533de4586cSChris Mason 14542903ff01SAl Viro src_inode = src.file->f_path.dentry->d_inode; 14553de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 1456d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 1457d397712bSChris Mason "another FS\n"); 14583de4586cSChris Mason ret = -EINVAL; 1459ecd18815SAl Viro } else { 146072fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 146172fd032eSSage Weil BTRFS_I(src_inode)->root, 14626f72c7e2SArne Jansen transid, readonly, inherit); 1463ecd18815SAl Viro } 14642903ff01SAl Viro fdput(src); 1465cb8e7090SChristoph Hellwig } 1466a874a63eSLiu Bo out_drop_write: 1467a874a63eSLiu Bo mnt_drop_write_file(file); 1468f46b5a66SChristoph Hellwig out: 146972fd032eSSage Weil return ret; 147072fd032eSSage Weil } 147172fd032eSSage Weil 147272fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1473fa0d2b9bSLi Zefan void __user *arg, int subvol) 147472fd032eSSage Weil { 1475fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 147672fd032eSSage Weil int ret; 147772fd032eSSage Weil 1478fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1479fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1480fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1481fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1482fa0d2b9bSLi Zefan 1483fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1484b83cc969SLi Zefan vol_args->fd, subvol, 14856f72c7e2SArne Jansen NULL, false, NULL); 1486fa0d2b9bSLi Zefan 1487fa0d2b9bSLi Zefan kfree(vol_args); 1488fa0d2b9bSLi Zefan return ret; 1489fa0d2b9bSLi Zefan } 1490fa0d2b9bSLi Zefan 1491fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1492fa0d2b9bSLi Zefan void __user *arg, int subvol) 1493fa0d2b9bSLi Zefan { 1494fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1495fa0d2b9bSLi Zefan int ret; 1496fdfb1e4fSLi Zefan u64 transid = 0; 1497fdfb1e4fSLi Zefan u64 *ptr = NULL; 1498b83cc969SLi Zefan bool readonly = false; 14996f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 150072fd032eSSage Weil 1501fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1502fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1503fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1504fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1505fdfb1e4fSLi Zefan 1506b83cc969SLi Zefan if (vol_args->flags & 15076f72c7e2SArne Jansen ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | 15086f72c7e2SArne Jansen BTRFS_SUBVOL_QGROUP_INHERIT)) { 1509b83cc969SLi Zefan ret = -EOPNOTSUPP; 1510fdfb1e4fSLi Zefan goto out; 1511fdfb1e4fSLi Zefan } 1512fdfb1e4fSLi Zefan 1513fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1514fdfb1e4fSLi Zefan ptr = &transid; 1515b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1516b83cc969SLi Zefan readonly = true; 15176f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 15186f72c7e2SArne Jansen if (vol_args->size > PAGE_CACHE_SIZE) { 15196f72c7e2SArne Jansen ret = -EINVAL; 15206f72c7e2SArne Jansen goto out; 15216f72c7e2SArne Jansen } 15226f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 15236f72c7e2SArne Jansen if (IS_ERR(inherit)) { 15246f72c7e2SArne Jansen ret = PTR_ERR(inherit); 15256f72c7e2SArne Jansen goto out; 15266f72c7e2SArne Jansen } 15276f72c7e2SArne Jansen } 152875eaa0e2SSage Weil 1529fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 15306f72c7e2SArne Jansen vol_args->fd, subvol, ptr, 15316f72c7e2SArne Jansen readonly, &inherit); 153275eaa0e2SSage Weil 1533fdfb1e4fSLi Zefan if (ret == 0 && ptr && 153475eaa0e2SSage Weil copy_to_user(arg + 1535fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1536fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 153775eaa0e2SSage Weil ret = -EFAULT; 1538fdfb1e4fSLi Zefan out: 1539f46b5a66SChristoph Hellwig kfree(vol_args); 15406f72c7e2SArne Jansen kfree(inherit); 1541f46b5a66SChristoph Hellwig return ret; 1542f46b5a66SChristoph Hellwig } 1543f46b5a66SChristoph Hellwig 15440caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 15450caa102dSLi Zefan void __user *arg) 15460caa102dSLi Zefan { 15470caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 15480caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 15490caa102dSLi Zefan int ret = 0; 15500caa102dSLi Zefan u64 flags = 0; 15510caa102dSLi Zefan 155233345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 15530caa102dSLi Zefan return -EINVAL; 15540caa102dSLi Zefan 15550caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 15560caa102dSLi Zefan if (btrfs_root_readonly(root)) 15570caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 15580caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 15590caa102dSLi Zefan 15600caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 15610caa102dSLi Zefan ret = -EFAULT; 15620caa102dSLi Zefan 15630caa102dSLi Zefan return ret; 15640caa102dSLi Zefan } 15650caa102dSLi Zefan 15660caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 15670caa102dSLi Zefan void __user *arg) 15680caa102dSLi Zefan { 15690caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 15700caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 15710caa102dSLi Zefan struct btrfs_trans_handle *trans; 15720caa102dSLi Zefan u64 root_flags; 15730caa102dSLi Zefan u64 flags; 15740caa102dSLi Zefan int ret = 0; 15750caa102dSLi Zefan 1576b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1577b9ca0664SLiu Bo if (ret) 1578b9ca0664SLiu Bo goto out; 15790caa102dSLi Zefan 1580b9ca0664SLiu Bo if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 1581b9ca0664SLiu Bo ret = -EINVAL; 1582b9ca0664SLiu Bo goto out_drop_write; 1583b9ca0664SLiu Bo } 15840caa102dSLi Zefan 1585b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1586b9ca0664SLiu Bo ret = -EFAULT; 1587b9ca0664SLiu Bo goto out_drop_write; 1588b9ca0664SLiu Bo } 15890caa102dSLi Zefan 1590b9ca0664SLiu Bo if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { 1591b9ca0664SLiu Bo ret = -EINVAL; 1592b9ca0664SLiu Bo goto out_drop_write; 1593b9ca0664SLiu Bo } 15940caa102dSLi Zefan 1595b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1596b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1597b9ca0664SLiu Bo goto out_drop_write; 1598b9ca0664SLiu Bo } 15990caa102dSLi Zefan 1600b9ca0664SLiu Bo if (!inode_owner_or_capable(inode)) { 1601b9ca0664SLiu Bo ret = -EACCES; 1602b9ca0664SLiu Bo goto out_drop_write; 1603b9ca0664SLiu Bo } 1604b4dc2b8cSLi Zefan 16050caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 16060caa102dSLi Zefan 16070caa102dSLi Zefan /* nothing to do */ 16080caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1609b9ca0664SLiu Bo goto out_drop_sem; 16100caa102dSLi Zefan 16110caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 16120caa102dSLi Zefan if (flags & BTRFS_SUBVOL_RDONLY) 16130caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 16140caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 16150caa102dSLi Zefan else 16160caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 16170caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 16180caa102dSLi Zefan 16190caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 16200caa102dSLi Zefan if (IS_ERR(trans)) { 16210caa102dSLi Zefan ret = PTR_ERR(trans); 16220caa102dSLi Zefan goto out_reset; 16230caa102dSLi Zefan } 16240caa102dSLi Zefan 1625b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 16260caa102dSLi Zefan &root->root_key, &root->root_item); 16270caa102dSLi Zefan 16280caa102dSLi Zefan btrfs_commit_transaction(trans, root); 16290caa102dSLi Zefan out_reset: 16300caa102dSLi Zefan if (ret) 16310caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1632b9ca0664SLiu Bo out_drop_sem: 16330caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 1634b9ca0664SLiu Bo out_drop_write: 1635b9ca0664SLiu Bo mnt_drop_write_file(file); 1636b9ca0664SLiu Bo out: 16370caa102dSLi Zefan return ret; 16380caa102dSLi Zefan } 16390caa102dSLi Zefan 164076dda93cSYan, Zheng /* 164176dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 164276dda93cSYan, Zheng */ 164376dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 164476dda93cSYan, Zheng { 164576dda93cSYan, Zheng struct btrfs_path *path; 164676dda93cSYan, Zheng struct btrfs_key key; 164776dda93cSYan, Zheng int ret; 164876dda93cSYan, Zheng 164976dda93cSYan, Zheng path = btrfs_alloc_path(); 165076dda93cSYan, Zheng if (!path) 165176dda93cSYan, Zheng return -ENOMEM; 165276dda93cSYan, Zheng 165376dda93cSYan, Zheng key.objectid = root->root_key.objectid; 165476dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 165576dda93cSYan, Zheng key.offset = (u64)-1; 165676dda93cSYan, Zheng 165776dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 165876dda93cSYan, Zheng &key, path, 0, 0); 165976dda93cSYan, Zheng if (ret < 0) 166076dda93cSYan, Zheng goto out; 166176dda93cSYan, Zheng BUG_ON(ret == 0); 166276dda93cSYan, Zheng 166376dda93cSYan, Zheng ret = 0; 166476dda93cSYan, Zheng if (path->slots[0] > 0) { 166576dda93cSYan, Zheng path->slots[0]--; 166676dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 166776dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 166876dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 166976dda93cSYan, Zheng ret = -ENOTEMPTY; 167076dda93cSYan, Zheng } 167176dda93cSYan, Zheng out: 167276dda93cSYan, Zheng btrfs_free_path(path); 167376dda93cSYan, Zheng return ret; 167476dda93cSYan, Zheng } 167576dda93cSYan, Zheng 1676ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1677ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1678ac8e9819SChris Mason { 1679abc6e134SChris Mason struct btrfs_key test; 1680abc6e134SChris Mason int ret; 1681abc6e134SChris Mason 1682abc6e134SChris Mason test.objectid = sk->min_objectid; 1683abc6e134SChris Mason test.type = sk->min_type; 1684abc6e134SChris Mason test.offset = sk->min_offset; 1685abc6e134SChris Mason 1686abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1687abc6e134SChris Mason if (ret < 0) 1688ac8e9819SChris Mason return 0; 1689abc6e134SChris Mason 1690abc6e134SChris Mason test.objectid = sk->max_objectid; 1691abc6e134SChris Mason test.type = sk->max_type; 1692abc6e134SChris Mason test.offset = sk->max_offset; 1693abc6e134SChris Mason 1694abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1695abc6e134SChris Mason if (ret > 0) 1696ac8e9819SChris Mason return 0; 1697ac8e9819SChris Mason return 1; 1698ac8e9819SChris Mason } 1699ac8e9819SChris Mason 1700ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1701ac8e9819SChris Mason struct btrfs_path *path, 1702ac8e9819SChris Mason struct btrfs_key *key, 1703ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1704ac8e9819SChris Mason char *buf, 1705ac8e9819SChris Mason unsigned long *sk_offset, 1706ac8e9819SChris Mason int *num_found) 1707ac8e9819SChris Mason { 1708ac8e9819SChris Mason u64 found_transid; 1709ac8e9819SChris Mason struct extent_buffer *leaf; 1710ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1711ac8e9819SChris Mason unsigned long item_off; 1712ac8e9819SChris Mason unsigned long item_len; 1713ac8e9819SChris Mason int nritems; 1714ac8e9819SChris Mason int i; 1715ac8e9819SChris Mason int slot; 1716ac8e9819SChris Mason int ret = 0; 1717ac8e9819SChris Mason 1718ac8e9819SChris Mason leaf = path->nodes[0]; 1719ac8e9819SChris Mason slot = path->slots[0]; 1720ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1721ac8e9819SChris Mason 1722ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1723ac8e9819SChris Mason i = nritems; 1724ac8e9819SChris Mason goto advance_key; 1725ac8e9819SChris Mason } 1726ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1727ac8e9819SChris Mason 1728ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1729ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1730ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1731ac8e9819SChris Mason 1732ac8e9819SChris Mason if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1733ac8e9819SChris Mason item_len = 0; 1734ac8e9819SChris Mason 1735ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1736ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1737ac8e9819SChris Mason ret = 1; 1738ac8e9819SChris Mason goto overflow; 1739ac8e9819SChris Mason } 1740ac8e9819SChris Mason 1741ac8e9819SChris Mason btrfs_item_key_to_cpu(leaf, key, i); 1742ac8e9819SChris Mason if (!key_in_sk(key, sk)) 1743ac8e9819SChris Mason continue; 1744ac8e9819SChris Mason 1745ac8e9819SChris Mason sh.objectid = key->objectid; 1746ac8e9819SChris Mason sh.offset = key->offset; 1747ac8e9819SChris Mason sh.type = key->type; 1748ac8e9819SChris Mason sh.len = item_len; 1749ac8e9819SChris Mason sh.transid = found_transid; 1750ac8e9819SChris Mason 1751ac8e9819SChris Mason /* copy search result header */ 1752ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1753ac8e9819SChris Mason *sk_offset += sizeof(sh); 1754ac8e9819SChris Mason 1755ac8e9819SChris Mason if (item_len) { 1756ac8e9819SChris Mason char *p = buf + *sk_offset; 1757ac8e9819SChris Mason /* copy the item */ 1758ac8e9819SChris Mason read_extent_buffer(leaf, p, 1759ac8e9819SChris Mason item_off, item_len); 1760ac8e9819SChris Mason *sk_offset += item_len; 1761ac8e9819SChris Mason } 1762e2156867SHugo Mills (*num_found)++; 1763ac8e9819SChris Mason 1764ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1765ac8e9819SChris Mason break; 1766ac8e9819SChris Mason } 1767ac8e9819SChris Mason advance_key: 1768ac8e9819SChris Mason ret = 0; 1769abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1770abc6e134SChris Mason key->offset++; 1771abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1772abc6e134SChris Mason key->offset = 0; 1773abc6e134SChris Mason key->type++; 1774abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1775abc6e134SChris Mason key->offset = 0; 1776abc6e134SChris Mason key->type = 0; 1777abc6e134SChris Mason key->objectid++; 1778abc6e134SChris Mason } else 1779abc6e134SChris Mason ret = 1; 1780ac8e9819SChris Mason overflow: 1781ac8e9819SChris Mason return ret; 1782ac8e9819SChris Mason } 1783ac8e9819SChris Mason 1784ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1785ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1786ac8e9819SChris Mason { 1787ac8e9819SChris Mason struct btrfs_root *root; 1788ac8e9819SChris Mason struct btrfs_key key; 1789ac8e9819SChris Mason struct btrfs_key max_key; 1790ac8e9819SChris Mason struct btrfs_path *path; 1791ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1792ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1793ac8e9819SChris Mason int ret; 1794ac8e9819SChris Mason int num_found = 0; 1795ac8e9819SChris Mason unsigned long sk_offset = 0; 1796ac8e9819SChris Mason 1797ac8e9819SChris Mason path = btrfs_alloc_path(); 1798ac8e9819SChris Mason if (!path) 1799ac8e9819SChris Mason return -ENOMEM; 1800ac8e9819SChris Mason 1801ac8e9819SChris Mason if (sk->tree_id == 0) { 1802ac8e9819SChris Mason /* search the root of the inode that was passed */ 1803ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1804ac8e9819SChris Mason } else { 1805ac8e9819SChris Mason key.objectid = sk->tree_id; 1806ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1807ac8e9819SChris Mason key.offset = (u64)-1; 1808ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1809ac8e9819SChris Mason if (IS_ERR(root)) { 1810ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1811ac8e9819SChris Mason sk->tree_id); 1812ac8e9819SChris Mason btrfs_free_path(path); 1813ac8e9819SChris Mason return -ENOENT; 1814ac8e9819SChris Mason } 1815ac8e9819SChris Mason } 1816ac8e9819SChris Mason 1817ac8e9819SChris Mason key.objectid = sk->min_objectid; 1818ac8e9819SChris Mason key.type = sk->min_type; 1819ac8e9819SChris Mason key.offset = sk->min_offset; 1820ac8e9819SChris Mason 1821ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1822ac8e9819SChris Mason max_key.type = sk->max_type; 1823ac8e9819SChris Mason max_key.offset = sk->max_offset; 1824ac8e9819SChris Mason 1825ac8e9819SChris Mason path->keep_locks = 1; 1826ac8e9819SChris Mason 1827ac8e9819SChris Mason while(1) { 1828ac8e9819SChris Mason ret = btrfs_search_forward(root, &key, &max_key, path, 0, 1829ac8e9819SChris Mason sk->min_transid); 1830ac8e9819SChris Mason if (ret != 0) { 1831ac8e9819SChris Mason if (ret > 0) 1832ac8e9819SChris Mason ret = 0; 1833ac8e9819SChris Mason goto err; 1834ac8e9819SChris Mason } 1835ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1836ac8e9819SChris Mason &sk_offset, &num_found); 1837b3b4aa74SDavid Sterba btrfs_release_path(path); 1838ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1839ac8e9819SChris Mason break; 1840ac8e9819SChris Mason 1841ac8e9819SChris Mason } 1842ac8e9819SChris Mason ret = 0; 1843ac8e9819SChris Mason err: 1844ac8e9819SChris Mason sk->nr_items = num_found; 1845ac8e9819SChris Mason btrfs_free_path(path); 1846ac8e9819SChris Mason return ret; 1847ac8e9819SChris Mason } 1848ac8e9819SChris Mason 1849ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1850ac8e9819SChris Mason void __user *argp) 1851ac8e9819SChris Mason { 1852ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1853ac8e9819SChris Mason struct inode *inode; 1854ac8e9819SChris Mason int ret; 1855ac8e9819SChris Mason 1856ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1857ac8e9819SChris Mason return -EPERM; 1858ac8e9819SChris Mason 18592354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 18602354d08fSJulia Lawall if (IS_ERR(args)) 18612354d08fSJulia Lawall return PTR_ERR(args); 1862ac8e9819SChris Mason 1863ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1864ac8e9819SChris Mason ret = search_ioctl(inode, args); 1865ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1866ac8e9819SChris Mason ret = -EFAULT; 1867ac8e9819SChris Mason kfree(args); 1868ac8e9819SChris Mason return ret; 1869ac8e9819SChris Mason } 1870ac8e9819SChris Mason 187198d377a0STARUISI Hiroaki /* 1872ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1873ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 187498d377a0STARUISI Hiroaki */ 187598d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 187698d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 187798d377a0STARUISI Hiroaki { 187898d377a0STARUISI Hiroaki struct btrfs_root *root; 187998d377a0STARUISI Hiroaki struct btrfs_key key; 1880ac8e9819SChris Mason char *ptr; 188198d377a0STARUISI Hiroaki int ret = -1; 188298d377a0STARUISI Hiroaki int slot; 188398d377a0STARUISI Hiroaki int len; 188498d377a0STARUISI Hiroaki int total_len = 0; 188598d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 188698d377a0STARUISI Hiroaki struct extent_buffer *l; 188798d377a0STARUISI Hiroaki struct btrfs_path *path; 188898d377a0STARUISI Hiroaki 188998d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 189098d377a0STARUISI Hiroaki name[0]='\0'; 189198d377a0STARUISI Hiroaki return 0; 189298d377a0STARUISI Hiroaki } 189398d377a0STARUISI Hiroaki 189498d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 189598d377a0STARUISI Hiroaki if (!path) 189698d377a0STARUISI Hiroaki return -ENOMEM; 189798d377a0STARUISI Hiroaki 1898ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 189998d377a0STARUISI Hiroaki 190098d377a0STARUISI Hiroaki key.objectid = tree_id; 190198d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 190298d377a0STARUISI Hiroaki key.offset = (u64)-1; 190398d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 190498d377a0STARUISI Hiroaki if (IS_ERR(root)) { 190598d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 19068ad6fcabSChris Mason ret = -ENOENT; 19078ad6fcabSChris Mason goto out; 190898d377a0STARUISI Hiroaki } 190998d377a0STARUISI Hiroaki 191098d377a0STARUISI Hiroaki key.objectid = dirid; 191198d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 19128ad6fcabSChris Mason key.offset = (u64)-1; 191398d377a0STARUISI Hiroaki 191498d377a0STARUISI Hiroaki while(1) { 191598d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 191698d377a0STARUISI Hiroaki if (ret < 0) 191798d377a0STARUISI Hiroaki goto out; 191898d377a0STARUISI Hiroaki 191998d377a0STARUISI Hiroaki l = path->nodes[0]; 192098d377a0STARUISI Hiroaki slot = path->slots[0]; 19218ad6fcabSChris Mason if (ret > 0 && slot > 0) 19228ad6fcabSChris Mason slot--; 192398d377a0STARUISI Hiroaki btrfs_item_key_to_cpu(l, &key, slot); 192498d377a0STARUISI Hiroaki 192598d377a0STARUISI Hiroaki if (ret > 0 && (key.objectid != dirid || 1926ac8e9819SChris Mason key.type != BTRFS_INODE_REF_KEY)) { 1927ac8e9819SChris Mason ret = -ENOENT; 192898d377a0STARUISI Hiroaki goto out; 1929ac8e9819SChris Mason } 193098d377a0STARUISI Hiroaki 193198d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 193298d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 193398d377a0STARUISI Hiroaki ptr -= len + 1; 193498d377a0STARUISI Hiroaki total_len += len + 1; 1935ac8e9819SChris Mason if (ptr < name) 193698d377a0STARUISI Hiroaki goto out; 193798d377a0STARUISI Hiroaki 193898d377a0STARUISI Hiroaki *(ptr + len) = '/'; 193998d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 194098d377a0STARUISI Hiroaki 194198d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 194298d377a0STARUISI Hiroaki break; 194398d377a0STARUISI Hiroaki 1944b3b4aa74SDavid Sterba btrfs_release_path(path); 194598d377a0STARUISI Hiroaki key.objectid = key.offset; 19468ad6fcabSChris Mason key.offset = (u64)-1; 194798d377a0STARUISI Hiroaki dirid = key.objectid; 194898d377a0STARUISI Hiroaki } 1949ac8e9819SChris Mason if (ptr < name) 195098d377a0STARUISI Hiroaki goto out; 195177906a50SLi Zefan memmove(name, ptr, total_len); 195298d377a0STARUISI Hiroaki name[total_len]='\0'; 195398d377a0STARUISI Hiroaki ret = 0; 195498d377a0STARUISI Hiroaki out: 195598d377a0STARUISI Hiroaki btrfs_free_path(path); 1956ac8e9819SChris Mason return ret; 1957ac8e9819SChris Mason } 1958ac8e9819SChris Mason 1959ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 1960ac8e9819SChris Mason void __user *argp) 1961ac8e9819SChris Mason { 1962ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 1963ac8e9819SChris Mason struct inode *inode; 1964ac8e9819SChris Mason int ret; 1965ac8e9819SChris Mason 1966ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1967ac8e9819SChris Mason return -EPERM; 1968ac8e9819SChris Mason 19692354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 19702354d08fSJulia Lawall if (IS_ERR(args)) 19712354d08fSJulia Lawall return PTR_ERR(args); 1972c2b96929SDan Carpenter 1973ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1974ac8e9819SChris Mason 19751b53ac4dSChris Mason if (args->treeid == 0) 19761b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 19771b53ac4dSChris Mason 1978ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 1979ac8e9819SChris Mason args->treeid, args->objectid, 1980ac8e9819SChris Mason args->name); 1981ac8e9819SChris Mason 1982ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1983ac8e9819SChris Mason ret = -EFAULT; 1984ac8e9819SChris Mason 1985ac8e9819SChris Mason kfree(args); 198698d377a0STARUISI Hiroaki return ret; 198798d377a0STARUISI Hiroaki } 198898d377a0STARUISI Hiroaki 198976dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 199076dda93cSYan, Zheng void __user *arg) 199176dda93cSYan, Zheng { 199276dda93cSYan, Zheng struct dentry *parent = fdentry(file); 199376dda93cSYan, Zheng struct dentry *dentry; 199476dda93cSYan, Zheng struct inode *dir = parent->d_inode; 199576dda93cSYan, Zheng struct inode *inode; 199676dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 199776dda93cSYan, Zheng struct btrfs_root *dest = NULL; 199876dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 199976dda93cSYan, Zheng struct btrfs_trans_handle *trans; 200076dda93cSYan, Zheng int namelen; 200176dda93cSYan, Zheng int ret; 200276dda93cSYan, Zheng int err = 0; 200376dda93cSYan, Zheng 200476dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 200576dda93cSYan, Zheng if (IS_ERR(vol_args)) 200676dda93cSYan, Zheng return PTR_ERR(vol_args); 200776dda93cSYan, Zheng 200876dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 200976dda93cSYan, Zheng namelen = strlen(vol_args->name); 201076dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 201176dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 201276dda93cSYan, Zheng err = -EINVAL; 201376dda93cSYan, Zheng goto out; 201476dda93cSYan, Zheng } 201576dda93cSYan, Zheng 2016a561be71SAl Viro err = mnt_want_write_file(file); 201776dda93cSYan, Zheng if (err) 201876dda93cSYan, Zheng goto out; 201976dda93cSYan, Zheng 202076dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 202176dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 202276dda93cSYan, Zheng if (IS_ERR(dentry)) { 202376dda93cSYan, Zheng err = PTR_ERR(dentry); 202476dda93cSYan, Zheng goto out_unlock_dir; 202576dda93cSYan, Zheng } 202676dda93cSYan, Zheng 202776dda93cSYan, Zheng if (!dentry->d_inode) { 202876dda93cSYan, Zheng err = -ENOENT; 202976dda93cSYan, Zheng goto out_dput; 203076dda93cSYan, Zheng } 203176dda93cSYan, Zheng 203276dda93cSYan, Zheng inode = dentry->d_inode; 20334260f7c7SSage Weil dest = BTRFS_I(inode)->root; 20344260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)){ 20354260f7c7SSage Weil /* 20364260f7c7SSage Weil * Regular user. Only allow this with a special mount 20374260f7c7SSage Weil * option, when the user has write+exec access to the 20384260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 20394260f7c7SSage Weil * allowed. 20404260f7c7SSage Weil * 20414260f7c7SSage Weil * Note that this is _not_ check that the subvol is 20424260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 20434260f7c7SSage Weil * otherwise be able to delete. 20444260f7c7SSage Weil * 20454260f7c7SSage Weil * Users who want to delete empty subvols should try 20464260f7c7SSage Weil * rmdir(2). 20474260f7c7SSage Weil */ 20484260f7c7SSage Weil err = -EPERM; 20494260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 20504260f7c7SSage Weil goto out_dput; 20514260f7c7SSage Weil 20524260f7c7SSage Weil /* 20534260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 20544260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 20554260f7c7SSage Weil * must be called on the dentry referencing the root 20564260f7c7SSage Weil * of the subvol, not a random directory contained 20574260f7c7SSage Weil * within it. 20584260f7c7SSage Weil */ 20594260f7c7SSage Weil err = -EINVAL; 20604260f7c7SSage Weil if (root == dest) 20614260f7c7SSage Weil goto out_dput; 20624260f7c7SSage Weil 20634260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 20644260f7c7SSage Weil if (err) 20654260f7c7SSage Weil goto out_dput; 20664260f7c7SSage Weil 20674260f7c7SSage Weil /* check if subvolume may be deleted by a non-root user */ 20684260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 20694260f7c7SSage Weil if (err) 20704260f7c7SSage Weil goto out_dput; 20714260f7c7SSage Weil } 20724260f7c7SSage Weil 207333345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 207476dda93cSYan, Zheng err = -EINVAL; 207576dda93cSYan, Zheng goto out_dput; 207676dda93cSYan, Zheng } 207776dda93cSYan, Zheng 207876dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 207976dda93cSYan, Zheng err = d_invalidate(dentry); 208076dda93cSYan, Zheng if (err) 208176dda93cSYan, Zheng goto out_unlock; 208276dda93cSYan, Zheng 208376dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 208476dda93cSYan, Zheng 208576dda93cSYan, Zheng err = may_destroy_subvol(dest); 208676dda93cSYan, Zheng if (err) 208776dda93cSYan, Zheng goto out_up_write; 208876dda93cSYan, Zheng 2089a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2090a22285a6SYan, Zheng if (IS_ERR(trans)) { 2091a22285a6SYan, Zheng err = PTR_ERR(trans); 2092d327099aSDan Carpenter goto out_up_write; 2093a22285a6SYan, Zheng } 2094a22285a6SYan, Zheng trans->block_rsv = &root->fs_info->global_block_rsv; 2095a22285a6SYan, Zheng 209676dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 209776dda93cSYan, Zheng dest->root_key.objectid, 209876dda93cSYan, Zheng dentry->d_name.name, 209976dda93cSYan, Zheng dentry->d_name.len); 210079787eaaSJeff Mahoney if (ret) { 210179787eaaSJeff Mahoney err = ret; 210279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 210379787eaaSJeff Mahoney goto out_end_trans; 210479787eaaSJeff Mahoney } 210576dda93cSYan, Zheng 210676dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 210776dda93cSYan, Zheng 210876dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 210976dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 211076dda93cSYan, Zheng dest->root_item.drop_level = 0; 211176dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 211276dda93cSYan, Zheng 2113d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 211476dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 211576dda93cSYan, Zheng root->fs_info->tree_root, 211676dda93cSYan, Zheng dest->root_key.objectid); 211779787eaaSJeff Mahoney if (ret) { 211879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 211979787eaaSJeff Mahoney err = ret; 212079787eaaSJeff Mahoney goto out_end_trans; 2121d68fc57bSYan, Zheng } 212279787eaaSJeff Mahoney } 212379787eaaSJeff Mahoney out_end_trans: 2124531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 212579787eaaSJeff Mahoney if (ret && !err) 212679787eaaSJeff Mahoney err = ret; 212776dda93cSYan, Zheng inode->i_flags |= S_DEAD; 212876dda93cSYan, Zheng out_up_write: 212976dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 213076dda93cSYan, Zheng out_unlock: 213176dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 213276dda93cSYan, Zheng if (!err) { 2133efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 213476dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 213576dda93cSYan, Zheng d_delete(dentry); 213676dda93cSYan, Zheng } 213776dda93cSYan, Zheng out_dput: 213876dda93cSYan, Zheng dput(dentry); 213976dda93cSYan, Zheng out_unlock_dir: 214076dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 21412a79f17eSAl Viro mnt_drop_write_file(file); 214276dda93cSYan, Zheng out: 214376dda93cSYan, Zheng kfree(vol_args); 214476dda93cSYan, Zheng return err; 214576dda93cSYan, Zheng } 214676dda93cSYan, Zheng 21471e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2148f46b5a66SChristoph Hellwig { 2149f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2150f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 21511e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2152c146afadSYan Zheng int ret; 2153c146afadSYan Zheng 2154b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2155b83cc969SLi Zefan return -EROFS; 2156b83cc969SLi Zefan 2157a561be71SAl Viro ret = mnt_want_write_file(file); 2158c146afadSYan Zheng if (ret) 2159c146afadSYan Zheng return ret; 2160f46b5a66SChristoph Hellwig 2161f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2162f46b5a66SChristoph Hellwig case S_IFDIR: 2163e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2164e441d54dSChris Mason ret = -EPERM; 2165e441d54dSChris Mason goto out; 2166e441d54dSChris Mason } 21678929ecfaSYan, Zheng ret = btrfs_defrag_root(root, 0); 21688929ecfaSYan, Zheng if (ret) 21698929ecfaSYan, Zheng goto out; 21708929ecfaSYan, Zheng ret = btrfs_defrag_root(root->fs_info->extent_root, 0); 2171f46b5a66SChristoph Hellwig break; 2172f46b5a66SChristoph Hellwig case S_IFREG: 2173e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2174e441d54dSChris Mason ret = -EINVAL; 2175e441d54dSChris Mason goto out; 2176e441d54dSChris Mason } 21771e701a32SChris Mason 21781e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 21791e701a32SChris Mason if (!range) { 21801e701a32SChris Mason ret = -ENOMEM; 21811e701a32SChris Mason goto out; 21821e701a32SChris Mason } 21831e701a32SChris Mason 21841e701a32SChris Mason if (argp) { 21851e701a32SChris Mason if (copy_from_user(range, argp, 21861e701a32SChris Mason sizeof(*range))) { 21871e701a32SChris Mason ret = -EFAULT; 21881e701a32SChris Mason kfree(range); 2189683be16eSDan Carpenter goto out; 21901e701a32SChris Mason } 21911e701a32SChris Mason /* compression requires us to start the IO */ 21921e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 21931e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 21941e701a32SChris Mason range->extent_thresh = (u32)-1; 21951e701a32SChris Mason } 21961e701a32SChris Mason } else { 21971e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 21981e701a32SChris Mason range->len = (u64)-1; 21991e701a32SChris Mason } 22004cb5300bSChris Mason ret = btrfs_defrag_file(fdentry(file)->d_inode, file, 22014cb5300bSChris Mason range, 0, 0); 22024cb5300bSChris Mason if (ret > 0) 22034cb5300bSChris Mason ret = 0; 22041e701a32SChris Mason kfree(range); 2205f46b5a66SChristoph Hellwig break; 22068929ecfaSYan, Zheng default: 22078929ecfaSYan, Zheng ret = -EINVAL; 2208f46b5a66SChristoph Hellwig } 2209e441d54dSChris Mason out: 22102a79f17eSAl Viro mnt_drop_write_file(file); 2211e441d54dSChris Mason return ret; 2212f46b5a66SChristoph Hellwig } 2213f46b5a66SChristoph Hellwig 2214b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2215f46b5a66SChristoph Hellwig { 2216f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2217f46b5a66SChristoph Hellwig int ret; 2218f46b5a66SChristoph Hellwig 2219e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2220e441d54dSChris Mason return -EPERM; 2221e441d54dSChris Mason 2222c9e9f97bSIlya Dryomov mutex_lock(&root->fs_info->volume_mutex); 2223c9e9f97bSIlya Dryomov if (root->fs_info->balance_ctl) { 2224c9e9f97bSIlya Dryomov printk(KERN_INFO "btrfs: balance in progress\n"); 2225c9e9f97bSIlya Dryomov ret = -EINVAL; 2226c9e9f97bSIlya Dryomov goto out; 2227c9e9f97bSIlya Dryomov } 2228c9e9f97bSIlya Dryomov 2229dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2230c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2231c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2232c9e9f97bSIlya Dryomov goto out; 2233c9e9f97bSIlya Dryomov } 2234f46b5a66SChristoph Hellwig 22355516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2236f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2237f46b5a66SChristoph Hellwig 2238f46b5a66SChristoph Hellwig kfree(vol_args); 2239c9e9f97bSIlya Dryomov out: 2240c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 2241f46b5a66SChristoph Hellwig return ret; 2242f46b5a66SChristoph Hellwig } 2243f46b5a66SChristoph Hellwig 2244b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 2245f46b5a66SChristoph Hellwig { 2246f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2247f46b5a66SChristoph Hellwig int ret; 2248f46b5a66SChristoph Hellwig 2249e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2250e441d54dSChris Mason return -EPERM; 2251e441d54dSChris Mason 2252c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 2253c146afadSYan Zheng return -EROFS; 2254c146afadSYan Zheng 2255c9e9f97bSIlya Dryomov mutex_lock(&root->fs_info->volume_mutex); 2256c9e9f97bSIlya Dryomov if (root->fs_info->balance_ctl) { 2257c9e9f97bSIlya Dryomov printk(KERN_INFO "btrfs: balance in progress\n"); 2258c9e9f97bSIlya Dryomov ret = -EINVAL; 2259c9e9f97bSIlya Dryomov goto out; 2260c9e9f97bSIlya Dryomov } 2261c9e9f97bSIlya Dryomov 2262dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2263c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2264c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2265c9e9f97bSIlya Dryomov goto out; 2266c9e9f97bSIlya Dryomov } 2267f46b5a66SChristoph Hellwig 22685516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2269f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 2270f46b5a66SChristoph Hellwig 2271f46b5a66SChristoph Hellwig kfree(vol_args); 2272c9e9f97bSIlya Dryomov out: 2273c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 2274f46b5a66SChristoph Hellwig return ret; 2275f46b5a66SChristoph Hellwig } 2276f46b5a66SChristoph Hellwig 2277475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2278475f6387SJan Schmidt { 2279027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2280475f6387SJan Schmidt struct btrfs_device *device; 2281475f6387SJan Schmidt struct btrfs_device *next; 2282475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2283027ed2f0SLi Zefan int ret = 0; 2284475f6387SJan Schmidt 2285475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2286475f6387SJan Schmidt return -EPERM; 2287475f6387SJan Schmidt 2288027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2289027ed2f0SLi Zefan if (!fi_args) 2290027ed2f0SLi Zefan return -ENOMEM; 2291027ed2f0SLi Zefan 2292027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2293027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2294475f6387SJan Schmidt 2295475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2296475f6387SJan Schmidt list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { 2297027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2298027ed2f0SLi Zefan fi_args->max_id = device->devid; 2299475f6387SJan Schmidt } 2300475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2301475f6387SJan Schmidt 2302027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2303027ed2f0SLi Zefan ret = -EFAULT; 2304475f6387SJan Schmidt 2305027ed2f0SLi Zefan kfree(fi_args); 2306027ed2f0SLi Zefan return ret; 2307475f6387SJan Schmidt } 2308475f6387SJan Schmidt 2309475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2310475f6387SJan Schmidt { 2311475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2312475f6387SJan Schmidt struct btrfs_device *dev; 2313475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2314475f6387SJan Schmidt int ret = 0; 2315475f6387SJan Schmidt char *s_uuid = NULL; 2316475f6387SJan Schmidt char empty_uuid[BTRFS_UUID_SIZE] = {0}; 2317475f6387SJan Schmidt 2318475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2319475f6387SJan Schmidt return -EPERM; 2320475f6387SJan Schmidt 2321475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2322475f6387SJan Schmidt if (IS_ERR(di_args)) 2323475f6387SJan Schmidt return PTR_ERR(di_args); 2324475f6387SJan Schmidt 2325475f6387SJan Schmidt if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0) 2326475f6387SJan Schmidt s_uuid = di_args->uuid; 2327475f6387SJan Schmidt 2328475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2329475f6387SJan Schmidt dev = btrfs_find_device(root, di_args->devid, s_uuid, NULL); 2330475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2331475f6387SJan Schmidt 2332475f6387SJan Schmidt if (!dev) { 2333475f6387SJan Schmidt ret = -ENODEV; 2334475f6387SJan Schmidt goto out; 2335475f6387SJan Schmidt } 2336475f6387SJan Schmidt 2337475f6387SJan Schmidt di_args->devid = dev->devid; 2338475f6387SJan Schmidt di_args->bytes_used = dev->bytes_used; 2339475f6387SJan Schmidt di_args->total_bytes = dev->total_bytes; 2340475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2341a27202fbSJim Meyering if (dev->name) { 2342606686eeSJosef Bacik struct rcu_string *name; 2343606686eeSJosef Bacik 2344606686eeSJosef Bacik rcu_read_lock(); 2345606686eeSJosef Bacik name = rcu_dereference(dev->name); 2346606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2347606686eeSJosef Bacik rcu_read_unlock(); 2348a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2349a27202fbSJim Meyering } else { 235099ba55adSStefan Behrens di_args->path[0] = '\0'; 2351a27202fbSJim Meyering } 2352475f6387SJan Schmidt 2353475f6387SJan Schmidt out: 2354475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2355475f6387SJan Schmidt ret = -EFAULT; 2356475f6387SJan Schmidt 2357475f6387SJan Schmidt kfree(di_args); 2358475f6387SJan Schmidt return ret; 2359475f6387SJan Schmidt } 2360475f6387SJan Schmidt 236176dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 2362b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 2363f46b5a66SChristoph Hellwig { 2364f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2365f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 23662903ff01SAl Viro struct fd src_file; 2367f46b5a66SChristoph Hellwig struct inode *src; 2368f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2369f46b5a66SChristoph Hellwig struct btrfs_path *path; 2370f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 2371ae01a0abSYan Zheng char *buf; 2372ae01a0abSYan Zheng struct btrfs_key key; 2373f46b5a66SChristoph Hellwig u32 nritems; 2374f46b5a66SChristoph Hellwig int slot; 2375ae01a0abSYan Zheng int ret; 2376c5c9cd4dSSage Weil u64 len = olen; 2377c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 2378d20f7043SChris Mason 2379c5c9cd4dSSage Weil /* 2380c5c9cd4dSSage Weil * TODO: 2381c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 2382c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 2383c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 2384c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 2385c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 2386c5c9cd4dSSage Weil * they don't overlap)? 2387c5c9cd4dSSage Weil */ 2388c5c9cd4dSSage Weil 2389e441d54dSChris Mason /* the destination must be opened for writing */ 23902ebc3464SDan Rosenberg if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 2391e441d54dSChris Mason return -EINVAL; 2392e441d54dSChris Mason 2393b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2394b83cc969SLi Zefan return -EROFS; 2395b83cc969SLi Zefan 2396a561be71SAl Viro ret = mnt_want_write_file(file); 2397c146afadSYan Zheng if (ret) 2398c146afadSYan Zheng return ret; 2399c146afadSYan Zheng 24002903ff01SAl Viro src_file = fdget(srcfd); 24012903ff01SAl Viro if (!src_file.file) { 2402ab67b7c1SYan Zheng ret = -EBADF; 2403ab67b7c1SYan Zheng goto out_drop_write; 2404ab67b7c1SYan Zheng } 24055dc64164SDan Rosenberg 2406362a20c5SDavid Sterba ret = -EXDEV; 24072903ff01SAl Viro if (src_file.file->f_path.mnt != file->f_path.mnt) 2408362a20c5SDavid Sterba goto out_fput; 2409362a20c5SDavid Sterba 24102903ff01SAl Viro src = src_file.file->f_dentry->d_inode; 2411f46b5a66SChristoph Hellwig 2412c5c9cd4dSSage Weil ret = -EINVAL; 2413c5c9cd4dSSage Weil if (src == inode) 2414c5c9cd4dSSage Weil goto out_fput; 2415c5c9cd4dSSage Weil 24165dc64164SDan Rosenberg /* the src must be open for reading */ 24172903ff01SAl Viro if (!(src_file.file->f_mode & FMODE_READ)) 24185dc64164SDan Rosenberg goto out_fput; 24195dc64164SDan Rosenberg 24200e7b824cSLi Zefan /* don't make the dst file partly checksummed */ 24210e7b824cSLi Zefan if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 24220e7b824cSLi Zefan (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 24230e7b824cSLi Zefan goto out_fput; 24240e7b824cSLi Zefan 2425ae01a0abSYan Zheng ret = -EISDIR; 2426ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 2427f46b5a66SChristoph Hellwig goto out_fput; 2428f46b5a66SChristoph Hellwig 2429ae01a0abSYan Zheng ret = -EXDEV; 2430362a20c5SDavid Sterba if (src->i_sb != inode->i_sb) 2431ae01a0abSYan Zheng goto out_fput; 2432ae01a0abSYan Zheng 2433ae01a0abSYan Zheng ret = -ENOMEM; 2434ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 2435ae01a0abSYan Zheng if (!buf) 2436ae01a0abSYan Zheng goto out_fput; 2437ae01a0abSYan Zheng 2438ae01a0abSYan Zheng path = btrfs_alloc_path(); 2439ae01a0abSYan Zheng if (!path) { 2440ae01a0abSYan Zheng vfree(buf); 2441ae01a0abSYan Zheng goto out_fput; 2442ae01a0abSYan Zheng } 2443ae01a0abSYan Zheng path->reada = 2; 2444ae01a0abSYan Zheng 2445f46b5a66SChristoph Hellwig if (inode < src) { 2446fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 2447fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 2448f46b5a66SChristoph Hellwig } else { 2449fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 2450fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 2451f46b5a66SChristoph Hellwig } 2452f46b5a66SChristoph Hellwig 2453c5c9cd4dSSage Weil /* determine range to clone */ 2454c5c9cd4dSSage Weil ret = -EINVAL; 24552ebc3464SDan Rosenberg if (off + len > src->i_size || off + len < off) 2456f46b5a66SChristoph Hellwig goto out_unlock; 2457c5c9cd4dSSage Weil if (len == 0) 2458c5c9cd4dSSage Weil olen = len = src->i_size - off; 2459c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 2460c5c9cd4dSSage Weil if (off + len == src->i_size) 24612a6b8daeSLi Zefan len = ALIGN(src->i_size, bs) - off; 2462c5c9cd4dSSage Weil 2463c5c9cd4dSSage Weil /* verify the end result is block aligned */ 24642a6b8daeSLi Zefan if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 24652a6b8daeSLi Zefan !IS_ALIGNED(destoff, bs)) 2466c5c9cd4dSSage Weil goto out_unlock; 2467c5c9cd4dSSage Weil 2468d525e8abSLi Zefan if (destoff > inode->i_size) { 2469d525e8abSLi Zefan ret = btrfs_cont_expand(inode, inode->i_size, destoff); 2470d525e8abSLi Zefan if (ret) 2471d525e8abSLi Zefan goto out_unlock; 2472d525e8abSLi Zefan } 2473d525e8abSLi Zefan 247471ef0786SLi Zefan /* truncate page cache pages from target inode range */ 247571ef0786SLi Zefan truncate_inode_pages_range(&inode->i_data, destoff, 247671ef0786SLi Zefan PAGE_CACHE_ALIGN(destoff + len) - 1); 247771ef0786SLi Zefan 2478f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 2479f46b5a66SChristoph Hellwig another, and lock file content */ 2480f46b5a66SChristoph Hellwig while (1) { 248131840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 2482aa42ffd9SLiu Bo lock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 2483aa42ffd9SLiu Bo ordered = btrfs_lookup_first_ordered_extent(src, off + len - 1); 24849a019196SSage Weil if (!ordered && 2485aa42ffd9SLiu Bo !test_range_bit(&BTRFS_I(src)->io_tree, off, off + len - 1, 24869a019196SSage Weil EXTENT_DELALLOC, 0, NULL)) 2487f46b5a66SChristoph Hellwig break; 2488aa42ffd9SLiu Bo unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 2489ae01a0abSYan Zheng if (ordered) 2490ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 24919a019196SSage Weil btrfs_wait_ordered_range(src, off, len); 2492f46b5a66SChristoph Hellwig } 2493f46b5a66SChristoph Hellwig 2494c5c9cd4dSSage Weil /* clone data */ 249533345d01SLi Zefan key.objectid = btrfs_ino(src); 2496ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 2497ae01a0abSYan Zheng key.offset = 0; 2498f46b5a66SChristoph Hellwig 2499f46b5a66SChristoph Hellwig while (1) { 2500f46b5a66SChristoph Hellwig /* 2501f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 2502f46b5a66SChristoph Hellwig * tree. 2503f46b5a66SChristoph Hellwig */ 2504362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 2505362a20c5SDavid Sterba 0, 0); 2506f46b5a66SChristoph Hellwig if (ret < 0) 2507f46b5a66SChristoph Hellwig goto out; 2508f46b5a66SChristoph Hellwig 2509ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2510ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 2511362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 2512f46b5a66SChristoph Hellwig if (ret < 0) 2513f46b5a66SChristoph Hellwig goto out; 2514f46b5a66SChristoph Hellwig if (ret > 0) 2515f46b5a66SChristoph Hellwig break; 2516ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2517f46b5a66SChristoph Hellwig } 2518f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 2519f46b5a66SChristoph Hellwig slot = path->slots[0]; 2520f46b5a66SChristoph Hellwig 2521ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 2522d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 252333345d01SLi Zefan key.objectid != btrfs_ino(src)) 2524f46b5a66SChristoph Hellwig break; 2525f46b5a66SChristoph Hellwig 2526c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 2527c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 2528c5c9cd4dSSage Weil int type; 252931840ae1SZheng Yan u32 size; 253031840ae1SZheng Yan struct btrfs_key new_key; 2531c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 2532c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 2533c5c9cd4dSSage Weil u8 comp; 2534b5384d48SSage Weil u64 endoff; 253531840ae1SZheng Yan 253631840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 253731840ae1SZheng Yan read_extent_buffer(leaf, buf, 253831840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 253931840ae1SZheng Yan size); 2540c5c9cd4dSSage Weil 2541c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 2542c5c9cd4dSSage Weil struct btrfs_file_extent_item); 2543c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 2544c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 2545c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2546c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2547d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 2548d397712bSChris Mason extent); 2549d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 2550d397712bSChris Mason extent); 2551c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 2552d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 2553d397712bSChris Mason extent); 2554c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2555c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 2556c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 2557c5c9cd4dSSage Weil extent); 2558c5c9cd4dSSage Weil } 2559b3b4aa74SDavid Sterba btrfs_release_path(path); 256031840ae1SZheng Yan 2561050006a7SSage Weil if (key.offset + datal <= off || 2562aa42ffd9SLiu Bo key.offset >= off + len - 1) 2563c5c9cd4dSSage Weil goto next; 2564c5c9cd4dSSage Weil 256531840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 256633345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 25674d728ec7SLi Zefan if (off <= key.offset) 2568c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 25694d728ec7SLi Zefan else 25704d728ec7SLi Zefan new_key.offset = destoff; 2571c5c9cd4dSSage Weil 2572b6f3409bSSage Weil /* 2573b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 2574b6f3409bSSage Weil * 1 - add new extent 2575b6f3409bSSage Weil * 1 - inode update 2576b6f3409bSSage Weil */ 2577b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 2578a22285a6SYan, Zheng if (IS_ERR(trans)) { 2579a22285a6SYan, Zheng ret = PTR_ERR(trans); 2580a22285a6SYan, Zheng goto out; 2581a22285a6SYan, Zheng } 2582a22285a6SYan, Zheng 2583c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2584c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2585d72c0842SLi Zefan /* 2586d72c0842SLi Zefan * a | --- range to clone ---| b 2587d72c0842SLi Zefan * | ------------- extent ------------- | 2588d72c0842SLi Zefan */ 2589d72c0842SLi Zefan 2590d72c0842SLi Zefan /* substract range b */ 2591d72c0842SLi Zefan if (key.offset + datal > off + len) 2592d72c0842SLi Zefan datal = off + len - key.offset; 2593d72c0842SLi Zefan 2594d72c0842SLi Zefan /* substract range a */ 2595a22285a6SYan, Zheng if (off > key.offset) { 2596a22285a6SYan, Zheng datao += off - key.offset; 2597a22285a6SYan, Zheng datal -= off - key.offset; 2598a22285a6SYan, Zheng } 2599a22285a6SYan, Zheng 26005dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 2601a22285a6SYan, Zheng new_key.offset, 2602a22285a6SYan, Zheng new_key.offset + datal, 26032671485dSJosef Bacik 1); 260479787eaaSJeff Mahoney if (ret) { 260579787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 260679787eaaSJeff Mahoney ret); 260779787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 260879787eaaSJeff Mahoney goto out; 260979787eaaSJeff Mahoney } 2610a22285a6SYan, Zheng 261131840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 261231840ae1SZheng Yan &new_key, size); 261379787eaaSJeff Mahoney if (ret) { 261479787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 261579787eaaSJeff Mahoney ret); 261679787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 261779787eaaSJeff Mahoney goto out; 261879787eaaSJeff Mahoney } 261931840ae1SZheng Yan 262031840ae1SZheng Yan leaf = path->nodes[0]; 262131840ae1SZheng Yan slot = path->slots[0]; 262231840ae1SZheng Yan write_extent_buffer(leaf, buf, 262331840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 262431840ae1SZheng Yan size); 2625ae01a0abSYan Zheng 2626f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 2627f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 2628c5c9cd4dSSage Weil 2629c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 2630c5c9cd4dSSage Weil if (!disko) 2631c5c9cd4dSSage Weil datao = 0; 2632c5c9cd4dSSage Weil 2633c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 2634c5c9cd4dSSage Weil datao); 2635c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 2636c5c9cd4dSSage Weil datal); 2637c5c9cd4dSSage Weil if (disko) { 2638c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2639ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 26405d4f98a2SYan Zheng disko, diskl, 0, 2641f46b5a66SChristoph Hellwig root->root_key.objectid, 264233345d01SLi Zefan btrfs_ino(inode), 264366d7e7f0SArne Jansen new_key.offset - datao, 264466d7e7f0SArne Jansen 0); 264579787eaaSJeff Mahoney if (ret) { 264679787eaaSJeff Mahoney btrfs_abort_transaction(trans, 264779787eaaSJeff Mahoney root, 264879787eaaSJeff Mahoney ret); 264979787eaaSJeff Mahoney btrfs_end_transaction(trans, 265079787eaaSJeff Mahoney root); 265179787eaaSJeff Mahoney goto out; 265279787eaaSJeff Mahoney 265379787eaaSJeff Mahoney } 2654f46b5a66SChristoph Hellwig } 2655c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2656c5c9cd4dSSage Weil u64 skip = 0; 2657c5c9cd4dSSage Weil u64 trim = 0; 2658c5c9cd4dSSage Weil if (off > key.offset) { 2659c5c9cd4dSSage Weil skip = off - key.offset; 2660c5c9cd4dSSage Weil new_key.offset += skip; 266131840ae1SZheng Yan } 2662d397712bSChris Mason 2663c5c9cd4dSSage Weil if (key.offset + datal > off + len) 2664c5c9cd4dSSage Weil trim = key.offset + datal - (off + len); 2665d397712bSChris Mason 2666c5c9cd4dSSage Weil if (comp && (skip || trim)) { 2667c5c9cd4dSSage Weil ret = -EINVAL; 2668a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 2669c5c9cd4dSSage Weil goto out; 267031840ae1SZheng Yan } 2671c5c9cd4dSSage Weil size -= skip + trim; 2672c5c9cd4dSSage Weil datal -= skip + trim; 2673a22285a6SYan, Zheng 26745dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 2675a22285a6SYan, Zheng new_key.offset, 2676a22285a6SYan, Zheng new_key.offset + datal, 26772671485dSJosef Bacik 1); 267879787eaaSJeff Mahoney if (ret) { 267979787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 268079787eaaSJeff Mahoney ret); 268179787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 268279787eaaSJeff Mahoney goto out; 268379787eaaSJeff Mahoney } 2684a22285a6SYan, Zheng 2685c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 2686c5c9cd4dSSage Weil &new_key, size); 268779787eaaSJeff Mahoney if (ret) { 268879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 268979787eaaSJeff Mahoney ret); 269079787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 269179787eaaSJeff Mahoney goto out; 269279787eaaSJeff Mahoney } 2693c5c9cd4dSSage Weil 2694c5c9cd4dSSage Weil if (skip) { 2695d397712bSChris Mason u32 start = 2696d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 2697c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 2698c5c9cd4dSSage Weil datal); 2699c5c9cd4dSSage Weil } 2700c5c9cd4dSSage Weil 2701c5c9cd4dSSage Weil leaf = path->nodes[0]; 2702c5c9cd4dSSage Weil slot = path->slots[0]; 2703c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 2704c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 2705c5c9cd4dSSage Weil size); 2706c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2707c5c9cd4dSSage Weil } 2708c5c9cd4dSSage Weil 2709c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 2710b3b4aa74SDavid Sterba btrfs_release_path(path); 2711c5c9cd4dSSage Weil 27120c4d2d95SJosef Bacik inode_inc_iversion(inode); 2713a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 2714b5384d48SSage Weil 2715b5384d48SSage Weil /* 2716b5384d48SSage Weil * we round up to the block size at eof when 2717b5384d48SSage Weil * determining which extents to clone above, 2718b5384d48SSage Weil * but shouldn't round up the file size 2719b5384d48SSage Weil */ 2720b5384d48SSage Weil endoff = new_key.offset + datal; 27215f3888ffSLi Zefan if (endoff > destoff+olen) 27225f3888ffSLi Zefan endoff = destoff+olen; 2723b5384d48SSage Weil if (endoff > inode->i_size) 2724b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 2725b5384d48SSage Weil 2726a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 272779787eaaSJeff Mahoney if (ret) { 272879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 2729a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 273079787eaaSJeff Mahoney goto out; 273179787eaaSJeff Mahoney } 273279787eaaSJeff Mahoney ret = btrfs_end_transaction(trans, root); 2733a22285a6SYan, Zheng } 2734c5c9cd4dSSage Weil next: 2735b3b4aa74SDavid Sterba btrfs_release_path(path); 2736ae01a0abSYan Zheng key.offset++; 2737ae01a0abSYan Zheng } 2738f46b5a66SChristoph Hellwig ret = 0; 2739f46b5a66SChristoph Hellwig out: 2740b3b4aa74SDavid Sterba btrfs_release_path(path); 2741aa42ffd9SLiu Bo unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); 2742f46b5a66SChristoph Hellwig out_unlock: 2743f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 2744f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 2745ae01a0abSYan Zheng vfree(buf); 2746ae01a0abSYan Zheng btrfs_free_path(path); 2747f46b5a66SChristoph Hellwig out_fput: 27482903ff01SAl Viro fdput(src_file); 2749ab67b7c1SYan Zheng out_drop_write: 27502a79f17eSAl Viro mnt_drop_write_file(file); 2751f46b5a66SChristoph Hellwig return ret; 2752f46b5a66SChristoph Hellwig } 2753f46b5a66SChristoph Hellwig 27547a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 2755c5c9cd4dSSage Weil { 2756c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 2757c5c9cd4dSSage Weil 27587a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 2759c5c9cd4dSSage Weil return -EFAULT; 2760c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 2761c5c9cd4dSSage Weil args.src_length, args.dest_offset); 2762c5c9cd4dSSage Weil } 2763c5c9cd4dSSage Weil 2764f46b5a66SChristoph Hellwig /* 2765f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2766f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2767f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2768f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2769f46b5a66SChristoph Hellwig */ 2770b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 2771f46b5a66SChristoph Hellwig { 2772f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2773f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2774f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 27751ab86aedSSage Weil int ret; 2776f46b5a66SChristoph Hellwig 27771ab86aedSSage Weil ret = -EPERM; 2778df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 2779f46b5a66SChristoph Hellwig goto out; 27801ab86aedSSage Weil 27811ab86aedSSage Weil ret = -EINPROGRESS; 27821ab86aedSSage Weil if (file->private_data) 27831ab86aedSSage Weil goto out; 27849ca9ee09SSage Weil 2785b83cc969SLi Zefan ret = -EROFS; 2786b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2787b83cc969SLi Zefan goto out; 2788b83cc969SLi Zefan 2789a561be71SAl Viro ret = mnt_want_write_file(file); 2790c146afadSYan Zheng if (ret) 2791c146afadSYan Zheng goto out; 2792c146afadSYan Zheng 2793a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 27949ca9ee09SSage Weil 2795f46b5a66SChristoph Hellwig ret = -ENOMEM; 27967a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 2797abd30bb0STsutomu Itoh if (IS_ERR(trans)) 27981ab86aedSSage Weil goto out_drop; 27991ab86aedSSage Weil 28001ab86aedSSage Weil file->private_data = trans; 28011ab86aedSSage Weil return 0; 28021ab86aedSSage Weil 28031ab86aedSSage Weil out_drop: 2804a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 28052a79f17eSAl Viro mnt_drop_write_file(file); 2806f46b5a66SChristoph Hellwig out: 2807f46b5a66SChristoph Hellwig return ret; 2808f46b5a66SChristoph Hellwig } 2809f46b5a66SChristoph Hellwig 28106ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 28116ef5ed0dSJosef Bacik { 28126ef5ed0dSJosef Bacik struct inode *inode = fdentry(file)->d_inode; 28136ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 28146ef5ed0dSJosef Bacik struct btrfs_root *new_root; 28156ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 28166ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 28176ef5ed0dSJosef Bacik struct btrfs_path *path; 28186ef5ed0dSJosef Bacik struct btrfs_key location; 28196ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 28206ef5ed0dSJosef Bacik u64 objectid = 0; 28216ef5ed0dSJosef Bacik u64 dir_id; 28226ef5ed0dSJosef Bacik 28236ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 28246ef5ed0dSJosef Bacik return -EPERM; 28256ef5ed0dSJosef Bacik 28266ef5ed0dSJosef Bacik if (copy_from_user(&objectid, argp, sizeof(objectid))) 28276ef5ed0dSJosef Bacik return -EFAULT; 28286ef5ed0dSJosef Bacik 28296ef5ed0dSJosef Bacik if (!objectid) 28306ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 28316ef5ed0dSJosef Bacik 28326ef5ed0dSJosef Bacik location.objectid = objectid; 28336ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 28346ef5ed0dSJosef Bacik location.offset = (u64)-1; 28356ef5ed0dSJosef Bacik 28366ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 28376ef5ed0dSJosef Bacik if (IS_ERR(new_root)) 28386ef5ed0dSJosef Bacik return PTR_ERR(new_root); 28396ef5ed0dSJosef Bacik 28406ef5ed0dSJosef Bacik if (btrfs_root_refs(&new_root->root_item) == 0) 28416ef5ed0dSJosef Bacik return -ENOENT; 28426ef5ed0dSJosef Bacik 28436ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 28446ef5ed0dSJosef Bacik if (!path) 28456ef5ed0dSJosef Bacik return -ENOMEM; 28466ef5ed0dSJosef Bacik path->leave_spinning = 1; 28476ef5ed0dSJosef Bacik 28486ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 284998d5dc13STsutomu Itoh if (IS_ERR(trans)) { 28506ef5ed0dSJosef Bacik btrfs_free_path(path); 285198d5dc13STsutomu Itoh return PTR_ERR(trans); 28526ef5ed0dSJosef Bacik } 28536ef5ed0dSJosef Bacik 28546c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 28556ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 28566ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 2857cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 28586ef5ed0dSJosef Bacik btrfs_free_path(path); 28596ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 28606ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 28616ef5ed0dSJosef Bacik "this isn't going to work\n"); 28626ef5ed0dSJosef Bacik return -ENOENT; 28636ef5ed0dSJosef Bacik } 28646ef5ed0dSJosef Bacik 28656ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 28666ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 28676ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 28686ef5ed0dSJosef Bacik btrfs_free_path(path); 28696ef5ed0dSJosef Bacik 28702b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); 28716ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 28726ef5ed0dSJosef Bacik 28736ef5ed0dSJosef Bacik return 0; 28746ef5ed0dSJosef Bacik } 28756ef5ed0dSJosef Bacik 28765af3e8ccSStefan Behrens void btrfs_get_block_group_info(struct list_head *groups_list, 2877bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 2878bf5fc093SJosef Bacik { 2879bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 2880bf5fc093SJosef Bacik 2881bf5fc093SJosef Bacik space->total_bytes = 0; 2882bf5fc093SJosef Bacik space->used_bytes = 0; 2883bf5fc093SJosef Bacik space->flags = 0; 2884bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 2885bf5fc093SJosef Bacik space->flags = block_group->flags; 2886bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 2887bf5fc093SJosef Bacik space->used_bytes += 2888bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 2889bf5fc093SJosef Bacik } 2890bf5fc093SJosef Bacik } 2891bf5fc093SJosef Bacik 28921406e432SJosef Bacik long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 28931406e432SJosef Bacik { 28941406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 28951406e432SJosef Bacik struct btrfs_ioctl_space_info space; 28961406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 28977fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 289813f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 28991406e432SJosef Bacik struct btrfs_space_info *info; 2900bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 2901bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 2902bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 2903bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 2904bf5fc093SJosef Bacik int num_types = 4; 29057fde62bfSChris Mason int alloc_size; 29061406e432SJosef Bacik int ret = 0; 290751788b1bSDan Rosenberg u64 slot_count = 0; 2908bf5fc093SJosef Bacik int i, c; 29091406e432SJosef Bacik 29101406e432SJosef Bacik if (copy_from_user(&space_args, 29111406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 29121406e432SJosef Bacik sizeof(space_args))) 29131406e432SJosef Bacik return -EFAULT; 29141406e432SJosef Bacik 2915bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2916bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2917bf5fc093SJosef Bacik 2918bf5fc093SJosef Bacik info = NULL; 29197fde62bfSChris Mason rcu_read_lock(); 2920bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2921bf5fc093SJosef Bacik list) { 2922bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2923bf5fc093SJosef Bacik info = tmp; 2924bf5fc093SJosef Bacik break; 2925bf5fc093SJosef Bacik } 2926bf5fc093SJosef Bacik } 29277fde62bfSChris Mason rcu_read_unlock(); 29281406e432SJosef Bacik 2929bf5fc093SJosef Bacik if (!info) 2930bf5fc093SJosef Bacik continue; 2931bf5fc093SJosef Bacik 2932bf5fc093SJosef Bacik down_read(&info->groups_sem); 2933bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2934bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 2935bf5fc093SJosef Bacik slot_count++; 2936bf5fc093SJosef Bacik } 2937bf5fc093SJosef Bacik up_read(&info->groups_sem); 2938bf5fc093SJosef Bacik } 2939bf5fc093SJosef Bacik 29407fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 29417fde62bfSChris Mason if (space_args.space_slots == 0) { 29427fde62bfSChris Mason space_args.total_spaces = slot_count; 29437fde62bfSChris Mason goto out; 29447fde62bfSChris Mason } 2945bf5fc093SJosef Bacik 294651788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 2947bf5fc093SJosef Bacik 29487fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 2949bf5fc093SJosef Bacik 29507fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 29517fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 29527fde62bfSChris Mason */ 29537fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 29547fde62bfSChris Mason return -ENOMEM; 29557fde62bfSChris Mason 29567fde62bfSChris Mason space_args.total_spaces = 0; 29577fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 29587fde62bfSChris Mason if (!dest) 29597fde62bfSChris Mason return -ENOMEM; 29607fde62bfSChris Mason dest_orig = dest; 29617fde62bfSChris Mason 29627fde62bfSChris Mason /* now we have a buffer to copy into */ 2963bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2964bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2965bf5fc093SJosef Bacik 296651788b1bSDan Rosenberg if (!slot_count) 296751788b1bSDan Rosenberg break; 296851788b1bSDan Rosenberg 2969bf5fc093SJosef Bacik info = NULL; 29701406e432SJosef Bacik rcu_read_lock(); 2971bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2972bf5fc093SJosef Bacik list) { 2973bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2974bf5fc093SJosef Bacik info = tmp; 29757fde62bfSChris Mason break; 2976bf5fc093SJosef Bacik } 2977bf5fc093SJosef Bacik } 2978bf5fc093SJosef Bacik rcu_read_unlock(); 29797fde62bfSChris Mason 2980bf5fc093SJosef Bacik if (!info) 2981bf5fc093SJosef Bacik continue; 2982bf5fc093SJosef Bacik down_read(&info->groups_sem); 2983bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2984bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 29855af3e8ccSStefan Behrens btrfs_get_block_group_info( 29865af3e8ccSStefan Behrens &info->block_groups[c], &space); 29877fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 29881406e432SJosef Bacik dest++; 29891406e432SJosef Bacik space_args.total_spaces++; 299051788b1bSDan Rosenberg slot_count--; 29911406e432SJosef Bacik } 299251788b1bSDan Rosenberg if (!slot_count) 299351788b1bSDan Rosenberg break; 2994bf5fc093SJosef Bacik } 2995bf5fc093SJosef Bacik up_read(&info->groups_sem); 2996bf5fc093SJosef Bacik } 29971406e432SJosef Bacik 29982eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 29997fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 30007fde62bfSChris Mason 30017fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 30027fde62bfSChris Mason ret = -EFAULT; 30037fde62bfSChris Mason 30047fde62bfSChris Mason kfree(dest_orig); 30057fde62bfSChris Mason out: 30067fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 30071406e432SJosef Bacik ret = -EFAULT; 30081406e432SJosef Bacik 30091406e432SJosef Bacik return ret; 30101406e432SJosef Bacik } 30111406e432SJosef Bacik 3012f46b5a66SChristoph Hellwig /* 3013f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 3014f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 3015f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 3016f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 3017f46b5a66SChristoph Hellwig */ 3018f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 3019f46b5a66SChristoph Hellwig { 3020f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 3021f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3022f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3023f46b5a66SChristoph Hellwig 3024f46b5a66SChristoph Hellwig trans = file->private_data; 30251ab86aedSSage Weil if (!trans) 30261ab86aedSSage Weil return -EINVAL; 3027b214107eSChristoph Hellwig file->private_data = NULL; 30289ca9ee09SSage Weil 30291ab86aedSSage Weil btrfs_end_transaction(trans, root); 30301ab86aedSSage Weil 3031a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 30329ca9ee09SSage Weil 30332a79f17eSAl Viro mnt_drop_write_file(file); 30341ab86aedSSage Weil return 0; 3035f46b5a66SChristoph Hellwig } 3036f46b5a66SChristoph Hellwig 303746204592SSage Weil static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp) 303846204592SSage Weil { 303946204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 304046204592SSage Weil struct btrfs_trans_handle *trans; 304146204592SSage Weil u64 transid; 3042db5b493aSTsutomu Itoh int ret; 304346204592SSage Weil 304446204592SSage Weil trans = btrfs_start_transaction(root, 0); 304598d5dc13STsutomu Itoh if (IS_ERR(trans)) 304698d5dc13STsutomu Itoh return PTR_ERR(trans); 304746204592SSage Weil transid = trans->transid; 3048db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 30498b2b2d3cSTsutomu Itoh if (ret) { 30508b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 3051db5b493aSTsutomu Itoh return ret; 30528b2b2d3cSTsutomu Itoh } 305346204592SSage Weil 305446204592SSage Weil if (argp) 305546204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 305646204592SSage Weil return -EFAULT; 305746204592SSage Weil return 0; 305846204592SSage Weil } 305946204592SSage Weil 306046204592SSage Weil static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) 306146204592SSage Weil { 306246204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 306346204592SSage Weil u64 transid; 306446204592SSage Weil 306546204592SSage Weil if (argp) { 306646204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 306746204592SSage Weil return -EFAULT; 306846204592SSage Weil } else { 306946204592SSage Weil transid = 0; /* current trans */ 307046204592SSage Weil } 307146204592SSage Weil return btrfs_wait_for_commit(root, transid); 307246204592SSage Weil } 307346204592SSage Weil 3074475f6387SJan Schmidt static long btrfs_ioctl_scrub(struct btrfs_root *root, void __user *arg) 3075475f6387SJan Schmidt { 3076475f6387SJan Schmidt int ret; 3077475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3078475f6387SJan Schmidt 3079475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3080475f6387SJan Schmidt return -EPERM; 3081475f6387SJan Schmidt 3082475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3083475f6387SJan Schmidt if (IS_ERR(sa)) 3084475f6387SJan Schmidt return PTR_ERR(sa); 3085475f6387SJan Schmidt 3086475f6387SJan Schmidt ret = btrfs_scrub_dev(root, sa->devid, sa->start, sa->end, 30878628764eSArne Jansen &sa->progress, sa->flags & BTRFS_SCRUB_READONLY); 3088475f6387SJan Schmidt 3089475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3090475f6387SJan Schmidt ret = -EFAULT; 3091475f6387SJan Schmidt 3092475f6387SJan Schmidt kfree(sa); 3093475f6387SJan Schmidt return ret; 3094475f6387SJan Schmidt } 3095475f6387SJan Schmidt 3096475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 3097475f6387SJan Schmidt { 3098475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3099475f6387SJan Schmidt return -EPERM; 3100475f6387SJan Schmidt 3101475f6387SJan Schmidt return btrfs_scrub_cancel(root); 3102475f6387SJan Schmidt } 3103475f6387SJan Schmidt 3104475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 3105475f6387SJan Schmidt void __user *arg) 3106475f6387SJan Schmidt { 3107475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3108475f6387SJan Schmidt int ret; 3109475f6387SJan Schmidt 3110475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3111475f6387SJan Schmidt return -EPERM; 3112475f6387SJan Schmidt 3113475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3114475f6387SJan Schmidt if (IS_ERR(sa)) 3115475f6387SJan Schmidt return PTR_ERR(sa); 3116475f6387SJan Schmidt 3117475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 3118475f6387SJan Schmidt 3119475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3120475f6387SJan Schmidt ret = -EFAULT; 3121475f6387SJan Schmidt 3122475f6387SJan Schmidt kfree(sa); 3123475f6387SJan Schmidt return ret; 3124475f6387SJan Schmidt } 3125475f6387SJan Schmidt 3126c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 3127b27f7c0cSDavid Sterba void __user *arg) 3128c11d2c23SStefan Behrens { 3129c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3130c11d2c23SStefan Behrens int ret; 3131c11d2c23SStefan Behrens 3132c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3133c11d2c23SStefan Behrens if (IS_ERR(sa)) 3134c11d2c23SStefan Behrens return PTR_ERR(sa); 3135c11d2c23SStefan Behrens 3136b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3137b27f7c0cSDavid Sterba kfree(sa); 3138b27f7c0cSDavid Sterba return -EPERM; 3139b27f7c0cSDavid Sterba } 3140b27f7c0cSDavid Sterba 3141b27f7c0cSDavid Sterba ret = btrfs_get_dev_stats(root, sa); 3142c11d2c23SStefan Behrens 3143c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 3144c11d2c23SStefan Behrens ret = -EFAULT; 3145c11d2c23SStefan Behrens 3146c11d2c23SStefan Behrens kfree(sa); 3147c11d2c23SStefan Behrens return ret; 3148c11d2c23SStefan Behrens } 3149c11d2c23SStefan Behrens 3150d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3151d7728c96SJan Schmidt { 3152d7728c96SJan Schmidt int ret = 0; 3153d7728c96SJan Schmidt int i; 3154740c3d22SChris Mason u64 rel_ptr; 3155d7728c96SJan Schmidt int size; 3156806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3157d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3158d7728c96SJan Schmidt struct btrfs_path *path; 3159d7728c96SJan Schmidt 3160d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3161d7728c96SJan Schmidt return -EPERM; 3162d7728c96SJan Schmidt 3163d7728c96SJan Schmidt path = btrfs_alloc_path(); 3164d7728c96SJan Schmidt if (!path) { 3165d7728c96SJan Schmidt ret = -ENOMEM; 3166d7728c96SJan Schmidt goto out; 3167d7728c96SJan Schmidt } 3168d7728c96SJan Schmidt 3169d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3170d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3171d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3172d7728c96SJan Schmidt ipa = NULL; 3173d7728c96SJan Schmidt goto out; 3174d7728c96SJan Schmidt } 3175d7728c96SJan Schmidt 3176d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3177d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3178d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3179d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3180d7728c96SJan Schmidt ipath = NULL; 3181d7728c96SJan Schmidt goto out; 3182d7728c96SJan Schmidt } 3183d7728c96SJan Schmidt 3184d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3185d7728c96SJan Schmidt if (ret < 0) 3186d7728c96SJan Schmidt goto out; 3187d7728c96SJan Schmidt 3188d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3189745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3190745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3191740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3192d7728c96SJan Schmidt } 3193d7728c96SJan Schmidt 3194745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 3195745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 3196d7728c96SJan Schmidt if (ret) { 3197d7728c96SJan Schmidt ret = -EFAULT; 3198d7728c96SJan Schmidt goto out; 3199d7728c96SJan Schmidt } 3200d7728c96SJan Schmidt 3201d7728c96SJan Schmidt out: 3202d7728c96SJan Schmidt btrfs_free_path(path); 3203d7728c96SJan Schmidt free_ipath(ipath); 3204d7728c96SJan Schmidt kfree(ipa); 3205d7728c96SJan Schmidt 3206d7728c96SJan Schmidt return ret; 3207d7728c96SJan Schmidt } 3208d7728c96SJan Schmidt 3209d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3210d7728c96SJan Schmidt { 3211d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3212d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3213d7728c96SJan Schmidt 3214d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3215d7728c96SJan Schmidt inodes->bytes_left -= c; 3216d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3217d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3218d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3219d7728c96SJan Schmidt inodes->elem_cnt += 3; 3220d7728c96SJan Schmidt } else { 3221d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3222d7728c96SJan Schmidt inodes->bytes_left = 0; 3223d7728c96SJan Schmidt inodes->elem_missed += 3; 3224d7728c96SJan Schmidt } 3225d7728c96SJan Schmidt 3226d7728c96SJan Schmidt return 0; 3227d7728c96SJan Schmidt } 3228d7728c96SJan Schmidt 3229d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 3230d7728c96SJan Schmidt void __user *arg) 3231d7728c96SJan Schmidt { 3232d7728c96SJan Schmidt int ret = 0; 3233d7728c96SJan Schmidt int size; 3234d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3235d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3236d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3237d7728c96SJan Schmidt 3238d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3239d7728c96SJan Schmidt return -EPERM; 3240d7728c96SJan Schmidt 3241d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 3242d7728c96SJan Schmidt if (IS_ERR(loi)) { 3243d7728c96SJan Schmidt ret = PTR_ERR(loi); 3244d7728c96SJan Schmidt loi = NULL; 3245d7728c96SJan Schmidt goto out; 3246d7728c96SJan Schmidt } 3247d7728c96SJan Schmidt 3248d7728c96SJan Schmidt path = btrfs_alloc_path(); 3249d7728c96SJan Schmidt if (!path) { 3250d7728c96SJan Schmidt ret = -ENOMEM; 3251d7728c96SJan Schmidt goto out; 3252d7728c96SJan Schmidt } 3253d7728c96SJan Schmidt 3254425d17a2SLiu Bo size = min_t(u32, loi->size, 64 * 1024); 3255d7728c96SJan Schmidt inodes = init_data_container(size); 3256d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3257d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3258d7728c96SJan Schmidt inodes = NULL; 3259d7728c96SJan Schmidt goto out; 3260d7728c96SJan Schmidt } 3261d7728c96SJan Schmidt 3262df031f07SLiu Bo ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, 3263df031f07SLiu Bo build_ino_list, inodes); 3264df031f07SLiu Bo if (ret == -EINVAL) 3265d7728c96SJan Schmidt ret = -ENOENT; 3266d7728c96SJan Schmidt if (ret < 0) 3267d7728c96SJan Schmidt goto out; 3268d7728c96SJan Schmidt 3269745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 3270745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 3271d7728c96SJan Schmidt if (ret) 3272d7728c96SJan Schmidt ret = -EFAULT; 3273d7728c96SJan Schmidt 3274d7728c96SJan Schmidt out: 3275d7728c96SJan Schmidt btrfs_free_path(path); 3276425d17a2SLiu Bo vfree(inodes); 3277d7728c96SJan Schmidt kfree(loi); 3278d7728c96SJan Schmidt 3279d7728c96SJan Schmidt return ret; 3280d7728c96SJan Schmidt } 3281d7728c96SJan Schmidt 328219a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 3283c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3284c9e9f97bSIlya Dryomov { 3285c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3286c9e9f97bSIlya Dryomov 3287c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3288c9e9f97bSIlya Dryomov 3289837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 3290837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3291837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3292837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3293a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3294a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3295837d5b6eSIlya Dryomov 3296c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3297c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3298c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 329919a39dceSIlya Dryomov 330019a39dceSIlya Dryomov if (lock) { 330119a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 330219a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 330319a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 330419a39dceSIlya Dryomov } else { 330519a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 330619a39dceSIlya Dryomov } 3307c9e9f97bSIlya Dryomov } 3308c9e9f97bSIlya Dryomov 33099ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3310c9e9f97bSIlya Dryomov { 33119ba1f6e4SLiu Bo struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 3312c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3313c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3314c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3315c9e9f97bSIlya Dryomov int ret; 3316c9e9f97bSIlya Dryomov 3317c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3318c9e9f97bSIlya Dryomov return -EPERM; 3319c9e9f97bSIlya Dryomov 3320e54bfa31SLiu Bo ret = mnt_want_write_file(file); 33219ba1f6e4SLiu Bo if (ret) 33229ba1f6e4SLiu Bo return ret; 33239ba1f6e4SLiu Bo 3324c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 3325c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3326c9e9f97bSIlya Dryomov 3327c9e9f97bSIlya Dryomov if (arg) { 3328c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 3329c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 3330c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 3331c9e9f97bSIlya Dryomov goto out; 3332c9e9f97bSIlya Dryomov } 3333de322263SIlya Dryomov 3334de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3335de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3336de322263SIlya Dryomov ret = -ENOTCONN; 3337de322263SIlya Dryomov goto out_bargs; 3338de322263SIlya Dryomov } 3339de322263SIlya Dryomov 3340de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3341de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3342de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3343de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3344de322263SIlya Dryomov 3345de322263SIlya Dryomov goto do_balance; 3346de322263SIlya Dryomov } 3347c9e9f97bSIlya Dryomov } else { 3348c9e9f97bSIlya Dryomov bargs = NULL; 3349c9e9f97bSIlya Dryomov } 3350c9e9f97bSIlya Dryomov 3351837d5b6eSIlya Dryomov if (fs_info->balance_ctl) { 3352837d5b6eSIlya Dryomov ret = -EINPROGRESS; 3353837d5b6eSIlya Dryomov goto out_bargs; 3354837d5b6eSIlya Dryomov } 3355837d5b6eSIlya Dryomov 3356c9e9f97bSIlya Dryomov bctl = kzalloc(sizeof(*bctl), GFP_NOFS); 3357c9e9f97bSIlya Dryomov if (!bctl) { 3358c9e9f97bSIlya Dryomov ret = -ENOMEM; 3359c9e9f97bSIlya Dryomov goto out_bargs; 3360c9e9f97bSIlya Dryomov } 3361c9e9f97bSIlya Dryomov 3362c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 3363c9e9f97bSIlya Dryomov if (arg) { 3364c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 3365c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 3366c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 3367c9e9f97bSIlya Dryomov 3368c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 3369f43ffb60SIlya Dryomov } else { 3370f43ffb60SIlya Dryomov /* balance everything - no filters */ 3371f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 3372c9e9f97bSIlya Dryomov } 3373c9e9f97bSIlya Dryomov 3374de322263SIlya Dryomov do_balance: 3375c9e9f97bSIlya Dryomov ret = btrfs_balance(bctl, bargs); 3376c9e9f97bSIlya Dryomov /* 3377837d5b6eSIlya Dryomov * bctl is freed in __cancel_balance or in free_fs_info if 3378837d5b6eSIlya Dryomov * restriper was paused all the way until unmount 3379c9e9f97bSIlya Dryomov */ 3380c9e9f97bSIlya Dryomov if (arg) { 3381c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 3382c9e9f97bSIlya Dryomov ret = -EFAULT; 3383c9e9f97bSIlya Dryomov } 3384c9e9f97bSIlya Dryomov 3385c9e9f97bSIlya Dryomov out_bargs: 3386c9e9f97bSIlya Dryomov kfree(bargs); 3387c9e9f97bSIlya Dryomov out: 3388c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3389c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 3390e54bfa31SLiu Bo mnt_drop_write_file(file); 3391c9e9f97bSIlya Dryomov return ret; 3392c9e9f97bSIlya Dryomov } 3393c9e9f97bSIlya Dryomov 3394837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 3395837d5b6eSIlya Dryomov { 3396837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3397837d5b6eSIlya Dryomov return -EPERM; 3398837d5b6eSIlya Dryomov 3399837d5b6eSIlya Dryomov switch (cmd) { 3400837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 3401837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 3402a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 3403a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 3404837d5b6eSIlya Dryomov } 3405837d5b6eSIlya Dryomov 3406837d5b6eSIlya Dryomov return -EINVAL; 3407837d5b6eSIlya Dryomov } 3408837d5b6eSIlya Dryomov 340919a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 341019a39dceSIlya Dryomov void __user *arg) 341119a39dceSIlya Dryomov { 341219a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 341319a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 341419a39dceSIlya Dryomov int ret = 0; 341519a39dceSIlya Dryomov 341619a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 341719a39dceSIlya Dryomov return -EPERM; 341819a39dceSIlya Dryomov 341919a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 342019a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 342119a39dceSIlya Dryomov ret = -ENOTCONN; 342219a39dceSIlya Dryomov goto out; 342319a39dceSIlya Dryomov } 342419a39dceSIlya Dryomov 342519a39dceSIlya Dryomov bargs = kzalloc(sizeof(*bargs), GFP_NOFS); 342619a39dceSIlya Dryomov if (!bargs) { 342719a39dceSIlya Dryomov ret = -ENOMEM; 342819a39dceSIlya Dryomov goto out; 342919a39dceSIlya Dryomov } 343019a39dceSIlya Dryomov 343119a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 343219a39dceSIlya Dryomov 343319a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 343419a39dceSIlya Dryomov ret = -EFAULT; 343519a39dceSIlya Dryomov 343619a39dceSIlya Dryomov kfree(bargs); 343719a39dceSIlya Dryomov out: 343819a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 343919a39dceSIlya Dryomov return ret; 344019a39dceSIlya Dryomov } 344119a39dceSIlya Dryomov 34425d13a37bSArne Jansen static long btrfs_ioctl_quota_ctl(struct btrfs_root *root, void __user *arg) 34435d13a37bSArne Jansen { 34445d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 34455d13a37bSArne Jansen struct btrfs_trans_handle *trans = NULL; 34465d13a37bSArne Jansen int ret; 34475d13a37bSArne Jansen int err; 34485d13a37bSArne Jansen 34495d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 34505d13a37bSArne Jansen return -EPERM; 34515d13a37bSArne Jansen 34525d13a37bSArne Jansen if (root->fs_info->sb->s_flags & MS_RDONLY) 34535d13a37bSArne Jansen return -EROFS; 34545d13a37bSArne Jansen 34555d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 34565d13a37bSArne Jansen if (IS_ERR(sa)) 34575d13a37bSArne Jansen return PTR_ERR(sa); 34585d13a37bSArne Jansen 34595d13a37bSArne Jansen if (sa->cmd != BTRFS_QUOTA_CTL_RESCAN) { 34605d13a37bSArne Jansen trans = btrfs_start_transaction(root, 2); 34615d13a37bSArne Jansen if (IS_ERR(trans)) { 34625d13a37bSArne Jansen ret = PTR_ERR(trans); 34635d13a37bSArne Jansen goto out; 34645d13a37bSArne Jansen } 34655d13a37bSArne Jansen } 34665d13a37bSArne Jansen 34675d13a37bSArne Jansen switch (sa->cmd) { 34685d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 34695d13a37bSArne Jansen ret = btrfs_quota_enable(trans, root->fs_info); 34705d13a37bSArne Jansen break; 34715d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 34725d13a37bSArne Jansen ret = btrfs_quota_disable(trans, root->fs_info); 34735d13a37bSArne Jansen break; 34745d13a37bSArne Jansen case BTRFS_QUOTA_CTL_RESCAN: 34755d13a37bSArne Jansen ret = btrfs_quota_rescan(root->fs_info); 34765d13a37bSArne Jansen break; 34775d13a37bSArne Jansen default: 34785d13a37bSArne Jansen ret = -EINVAL; 34795d13a37bSArne Jansen break; 34805d13a37bSArne Jansen } 34815d13a37bSArne Jansen 34825d13a37bSArne Jansen if (copy_to_user(arg, sa, sizeof(*sa))) 34835d13a37bSArne Jansen ret = -EFAULT; 34845d13a37bSArne Jansen 34855d13a37bSArne Jansen if (trans) { 34865d13a37bSArne Jansen err = btrfs_commit_transaction(trans, root); 34875d13a37bSArne Jansen if (err && !ret) 34885d13a37bSArne Jansen ret = err; 34895d13a37bSArne Jansen } 34905d13a37bSArne Jansen 34915d13a37bSArne Jansen out: 34925d13a37bSArne Jansen kfree(sa); 34935d13a37bSArne Jansen return ret; 34945d13a37bSArne Jansen } 34955d13a37bSArne Jansen 34965d13a37bSArne Jansen static long btrfs_ioctl_qgroup_assign(struct btrfs_root *root, void __user *arg) 34975d13a37bSArne Jansen { 34985d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 34995d13a37bSArne Jansen struct btrfs_trans_handle *trans; 35005d13a37bSArne Jansen int ret; 35015d13a37bSArne Jansen int err; 35025d13a37bSArne Jansen 35035d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 35045d13a37bSArne Jansen return -EPERM; 35055d13a37bSArne Jansen 35065d13a37bSArne Jansen if (root->fs_info->sb->s_flags & MS_RDONLY) 35075d13a37bSArne Jansen return -EROFS; 35085d13a37bSArne Jansen 35095d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 35105d13a37bSArne Jansen if (IS_ERR(sa)) 35115d13a37bSArne Jansen return PTR_ERR(sa); 35125d13a37bSArne Jansen 35135d13a37bSArne Jansen trans = btrfs_join_transaction(root); 35145d13a37bSArne Jansen if (IS_ERR(trans)) { 35155d13a37bSArne Jansen ret = PTR_ERR(trans); 35165d13a37bSArne Jansen goto out; 35175d13a37bSArne Jansen } 35185d13a37bSArne Jansen 35195d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 35205d13a37bSArne Jansen if (sa->assign) { 35215d13a37bSArne Jansen ret = btrfs_add_qgroup_relation(trans, root->fs_info, 35225d13a37bSArne Jansen sa->src, sa->dst); 35235d13a37bSArne Jansen } else { 35245d13a37bSArne Jansen ret = btrfs_del_qgroup_relation(trans, root->fs_info, 35255d13a37bSArne Jansen sa->src, sa->dst); 35265d13a37bSArne Jansen } 35275d13a37bSArne Jansen 35285d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 35295d13a37bSArne Jansen if (err && !ret) 35305d13a37bSArne Jansen ret = err; 35315d13a37bSArne Jansen 35325d13a37bSArne Jansen out: 35335d13a37bSArne Jansen kfree(sa); 35345d13a37bSArne Jansen return ret; 35355d13a37bSArne Jansen } 35365d13a37bSArne Jansen 35375d13a37bSArne Jansen static long btrfs_ioctl_qgroup_create(struct btrfs_root *root, void __user *arg) 35385d13a37bSArne Jansen { 35395d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 35405d13a37bSArne Jansen struct btrfs_trans_handle *trans; 35415d13a37bSArne Jansen int ret; 35425d13a37bSArne Jansen int err; 35435d13a37bSArne Jansen 35445d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 35455d13a37bSArne Jansen return -EPERM; 35465d13a37bSArne Jansen 35475d13a37bSArne Jansen if (root->fs_info->sb->s_flags & MS_RDONLY) 35485d13a37bSArne Jansen return -EROFS; 35495d13a37bSArne Jansen 35505d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 35515d13a37bSArne Jansen if (IS_ERR(sa)) 35525d13a37bSArne Jansen return PTR_ERR(sa); 35535d13a37bSArne Jansen 35545d13a37bSArne Jansen trans = btrfs_join_transaction(root); 35555d13a37bSArne Jansen if (IS_ERR(trans)) { 35565d13a37bSArne Jansen ret = PTR_ERR(trans); 35575d13a37bSArne Jansen goto out; 35585d13a37bSArne Jansen } 35595d13a37bSArne Jansen 35605d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 35615d13a37bSArne Jansen if (sa->create) { 35625d13a37bSArne Jansen ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, 35635d13a37bSArne Jansen NULL); 35645d13a37bSArne Jansen } else { 35655d13a37bSArne Jansen ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); 35665d13a37bSArne Jansen } 35675d13a37bSArne Jansen 35685d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 35695d13a37bSArne Jansen if (err && !ret) 35705d13a37bSArne Jansen ret = err; 35715d13a37bSArne Jansen 35725d13a37bSArne Jansen out: 35735d13a37bSArne Jansen kfree(sa); 35745d13a37bSArne Jansen return ret; 35755d13a37bSArne Jansen } 35765d13a37bSArne Jansen 35775d13a37bSArne Jansen static long btrfs_ioctl_qgroup_limit(struct btrfs_root *root, void __user *arg) 35785d13a37bSArne Jansen { 35795d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 35805d13a37bSArne Jansen struct btrfs_trans_handle *trans; 35815d13a37bSArne Jansen int ret; 35825d13a37bSArne Jansen int err; 35835d13a37bSArne Jansen u64 qgroupid; 35845d13a37bSArne Jansen 35855d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 35865d13a37bSArne Jansen return -EPERM; 35875d13a37bSArne Jansen 35885d13a37bSArne Jansen if (root->fs_info->sb->s_flags & MS_RDONLY) 35895d13a37bSArne Jansen return -EROFS; 35905d13a37bSArne Jansen 35915d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 35925d13a37bSArne Jansen if (IS_ERR(sa)) 35935d13a37bSArne Jansen return PTR_ERR(sa); 35945d13a37bSArne Jansen 35955d13a37bSArne Jansen trans = btrfs_join_transaction(root); 35965d13a37bSArne Jansen if (IS_ERR(trans)) { 35975d13a37bSArne Jansen ret = PTR_ERR(trans); 35985d13a37bSArne Jansen goto out; 35995d13a37bSArne Jansen } 36005d13a37bSArne Jansen 36015d13a37bSArne Jansen qgroupid = sa->qgroupid; 36025d13a37bSArne Jansen if (!qgroupid) { 36035d13a37bSArne Jansen /* take the current subvol as qgroup */ 36045d13a37bSArne Jansen qgroupid = root->root_key.objectid; 36055d13a37bSArne Jansen } 36065d13a37bSArne Jansen 36075d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 36085d13a37bSArne Jansen ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); 36095d13a37bSArne Jansen 36105d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 36115d13a37bSArne Jansen if (err && !ret) 36125d13a37bSArne Jansen ret = err; 36135d13a37bSArne Jansen 36145d13a37bSArne Jansen out: 36155d13a37bSArne Jansen kfree(sa); 36165d13a37bSArne Jansen return ret; 36175d13a37bSArne Jansen } 36185d13a37bSArne Jansen 36198ea05e3aSAlexander Block static long btrfs_ioctl_set_received_subvol(struct file *file, 36208ea05e3aSAlexander Block void __user *arg) 36218ea05e3aSAlexander Block { 36228ea05e3aSAlexander Block struct btrfs_ioctl_received_subvol_args *sa = NULL; 36238ea05e3aSAlexander Block struct inode *inode = fdentry(file)->d_inode; 36248ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 36258ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 36268ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 36278ea05e3aSAlexander Block struct timespec ct = CURRENT_TIME; 36288ea05e3aSAlexander Block int ret = 0; 36298ea05e3aSAlexander Block 36308ea05e3aSAlexander Block ret = mnt_want_write_file(file); 36318ea05e3aSAlexander Block if (ret < 0) 36328ea05e3aSAlexander Block return ret; 36338ea05e3aSAlexander Block 36348ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 36358ea05e3aSAlexander Block 36368ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 36378ea05e3aSAlexander Block ret = -EINVAL; 36388ea05e3aSAlexander Block goto out; 36398ea05e3aSAlexander Block } 36408ea05e3aSAlexander Block 36418ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 36428ea05e3aSAlexander Block ret = -EROFS; 36438ea05e3aSAlexander Block goto out; 36448ea05e3aSAlexander Block } 36458ea05e3aSAlexander Block 36468ea05e3aSAlexander Block if (!inode_owner_or_capable(inode)) { 36478ea05e3aSAlexander Block ret = -EACCES; 36488ea05e3aSAlexander Block goto out; 36498ea05e3aSAlexander Block } 36508ea05e3aSAlexander Block 36518ea05e3aSAlexander Block sa = memdup_user(arg, sizeof(*sa)); 36528ea05e3aSAlexander Block if (IS_ERR(sa)) { 36538ea05e3aSAlexander Block ret = PTR_ERR(sa); 36548ea05e3aSAlexander Block sa = NULL; 36558ea05e3aSAlexander Block goto out; 36568ea05e3aSAlexander Block } 36578ea05e3aSAlexander Block 36588ea05e3aSAlexander Block trans = btrfs_start_transaction(root, 1); 36598ea05e3aSAlexander Block if (IS_ERR(trans)) { 36608ea05e3aSAlexander Block ret = PTR_ERR(trans); 36618ea05e3aSAlexander Block trans = NULL; 36628ea05e3aSAlexander Block goto out; 36638ea05e3aSAlexander Block } 36648ea05e3aSAlexander Block 36658ea05e3aSAlexander Block sa->rtransid = trans->transid; 36668ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 36678ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 36688ea05e3aSAlexander Block 36698ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 36708ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 36718ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 36728ea05e3aSAlexander Block root_item->stime.sec = cpu_to_le64(sa->stime.sec); 36738ea05e3aSAlexander Block root_item->stime.nsec = cpu_to_le32(sa->stime.nsec); 36748ea05e3aSAlexander Block root_item->rtime.sec = cpu_to_le64(sa->rtime.sec); 36758ea05e3aSAlexander Block root_item->rtime.nsec = cpu_to_le32(sa->rtime.nsec); 36768ea05e3aSAlexander Block 36778ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 36788ea05e3aSAlexander Block &root->root_key, &root->root_item); 36798ea05e3aSAlexander Block if (ret < 0) { 36808ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 36818ea05e3aSAlexander Block trans = NULL; 36828ea05e3aSAlexander Block goto out; 36838ea05e3aSAlexander Block } else { 36848ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 36858ea05e3aSAlexander Block if (ret < 0) 36868ea05e3aSAlexander Block goto out; 36878ea05e3aSAlexander Block } 36888ea05e3aSAlexander Block 36898ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 36908ea05e3aSAlexander Block if (ret) 36918ea05e3aSAlexander Block ret = -EFAULT; 36928ea05e3aSAlexander Block 36938ea05e3aSAlexander Block out: 36948ea05e3aSAlexander Block kfree(sa); 36958ea05e3aSAlexander Block up_write(&root->fs_info->subvol_sem); 36968ea05e3aSAlexander Block mnt_drop_write_file(file); 36978ea05e3aSAlexander Block return ret; 36988ea05e3aSAlexander Block } 36998ea05e3aSAlexander Block 3700f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 3701f46b5a66SChristoph Hellwig cmd, unsigned long arg) 3702f46b5a66SChristoph Hellwig { 3703f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 37044bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 3705f46b5a66SChristoph Hellwig 3706f46b5a66SChristoph Hellwig switch (cmd) { 37076cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 37086cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 37096cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 37106cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 37116cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 37126cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 3713f7039b1dSLi Dongyang case FITRIM: 3714f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 3715f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 3716fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 3717fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 3718fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 37193de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 3720fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 37216f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 37226f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 372376dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 372476dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 37250caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 37260caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 37270caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 37280caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 37296ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 37306ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 3731f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 37321e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 37331e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 37341e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 3735f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 37364bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 3737f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 37384bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 3739f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 37404bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 3741475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 3742475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 3743475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 3744475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 3745f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 37469ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 3747f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 3748c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 3749c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 37507a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 3751f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 3752f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 3753f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 3754f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 3755ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 3756ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 3757ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 3758ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 3759d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 3760d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 3761d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 3762d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 37631406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 37641406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 3765f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 3766f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 3767f46b5a66SChristoph Hellwig return 0; 376846204592SSage Weil case BTRFS_IOC_START_SYNC: 376946204592SSage Weil return btrfs_ioctl_start_sync(file, argp); 377046204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 377146204592SSage Weil return btrfs_ioctl_wait_sync(file, argp); 3772475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 3773475f6387SJan Schmidt return btrfs_ioctl_scrub(root, argp); 3774475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 3775475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 3776475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 3777475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 3778c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 37799ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 3780837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 3781837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 378219a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 378319a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 37848ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 37858ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 378631db9f7cSAlexander Block case BTRFS_IOC_SEND: 378731db9f7cSAlexander Block return btrfs_ioctl_send(file, argp); 3788c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 3789b27f7c0cSDavid Sterba return btrfs_ioctl_get_dev_stats(root, argp); 37905d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 37915d13a37bSArne Jansen return btrfs_ioctl_quota_ctl(root, argp); 37925d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 37935d13a37bSArne Jansen return btrfs_ioctl_qgroup_assign(root, argp); 37945d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 37955d13a37bSArne Jansen return btrfs_ioctl_qgroup_create(root, argp); 37965d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 37975d13a37bSArne Jansen return btrfs_ioctl_qgroup_limit(root, argp); 3798f46b5a66SChristoph Hellwig } 3799f46b5a66SChristoph Hellwig 3800f46b5a66SChristoph Hellwig return -ENOTTY; 3801f46b5a66SChristoph Hellwig } 3802