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> 444b4e25f2SChris Mason #include "compat.h" 45f46b5a66SChristoph Hellwig #include "ctree.h" 46f46b5a66SChristoph Hellwig #include "disk-io.h" 47f46b5a66SChristoph Hellwig #include "transaction.h" 48f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 49f46b5a66SChristoph Hellwig #include "ioctl.h" 50f46b5a66SChristoph Hellwig #include "print-tree.h" 51f46b5a66SChristoph Hellwig #include "volumes.h" 52925baeddSChris Mason #include "locking.h" 53581bb050SLi Zefan #include "inode-map.h" 54d7728c96SJan Schmidt #include "backref.h" 55606686eeSJosef Bacik #include "rcu-string.h" 56f46b5a66SChristoph Hellwig 576cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 586cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 596cbff00fSChristoph Hellwig { 606cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 616cbff00fSChristoph Hellwig return flags; 626cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 636cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 646cbff00fSChristoph Hellwig else 656cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 666cbff00fSChristoph Hellwig } 67f46b5a66SChristoph Hellwig 686cbff00fSChristoph Hellwig /* 696cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 706cbff00fSChristoph Hellwig */ 716cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 726cbff00fSChristoph Hellwig { 736cbff00fSChristoph Hellwig unsigned int iflags = 0; 746cbff00fSChristoph Hellwig 756cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 766cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 776cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 786cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 796cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 806cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 816cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 826cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 836cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 846cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 856cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 866cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 87d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 88d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 89d0092bddSLi Zefan 90d0092bddSLi Zefan if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) 91d0092bddSLi Zefan iflags |= FS_COMPR_FL; 92d0092bddSLi Zefan else if (flags & BTRFS_INODE_NOCOMPRESS) 93d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 946cbff00fSChristoph Hellwig 956cbff00fSChristoph Hellwig return iflags; 966cbff00fSChristoph Hellwig } 976cbff00fSChristoph Hellwig 986cbff00fSChristoph Hellwig /* 996cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1006cbff00fSChristoph Hellwig */ 1016cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 1026cbff00fSChristoph Hellwig { 1036cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1046cbff00fSChristoph Hellwig 1056cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 1066cbff00fSChristoph Hellwig 1076cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 1086cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 1096cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1106cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1116cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1126cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1136cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1146cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1156cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1166cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1176cbff00fSChristoph Hellwig } 1186cbff00fSChristoph Hellwig 1196cbff00fSChristoph Hellwig /* 1206cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1216cbff00fSChristoph Hellwig * 122e27425d6SJosef Bacik * Currently only the compression flags and the cow flags are inherited. 1236cbff00fSChristoph Hellwig */ 1246cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1256cbff00fSChristoph Hellwig { 1260b4dcea5SChris Mason unsigned int flags; 1270b4dcea5SChris Mason 1280b4dcea5SChris Mason if (!dir) 1290b4dcea5SChris Mason return; 1300b4dcea5SChris Mason 1310b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1326cbff00fSChristoph Hellwig 133e27425d6SJosef Bacik if (flags & BTRFS_INODE_NOCOMPRESS) { 134e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; 135e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; 136e27425d6SJosef Bacik } else if (flags & BTRFS_INODE_COMPRESS) { 137e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; 138e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; 139e27425d6SJosef Bacik } 1406cbff00fSChristoph Hellwig 141e27425d6SJosef Bacik if (flags & BTRFS_INODE_NODATACOW) 142e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; 143e27425d6SJosef Bacik 1446cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1456cbff00fSChristoph Hellwig } 1466cbff00fSChristoph Hellwig 1476cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1486cbff00fSChristoph Hellwig { 1496cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); 1506cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1516cbff00fSChristoph Hellwig 1526cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1536cbff00fSChristoph Hellwig return -EFAULT; 1546cbff00fSChristoph Hellwig return 0; 1556cbff00fSChristoph Hellwig } 1566cbff00fSChristoph Hellwig 15775e7cb7fSLiu Bo static int check_flags(unsigned int flags) 15875e7cb7fSLiu Bo { 15975e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 16075e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 16175e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 162e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 163e1e8fb6aSLi Zefan FS_NOCOW_FL)) 16475e7cb7fSLiu Bo return -EOPNOTSUPP; 16575e7cb7fSLiu Bo 16675e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 16775e7cb7fSLiu Bo return -EINVAL; 16875e7cb7fSLiu Bo 16975e7cb7fSLiu Bo return 0; 17075e7cb7fSLiu Bo } 17175e7cb7fSLiu Bo 1726cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1736cbff00fSChristoph Hellwig { 1746cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 1756cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1766cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1776cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1786cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1796cbff00fSChristoph Hellwig int ret; 180f062abf0SLi Zefan u64 ip_oldflags; 181f062abf0SLi Zefan unsigned int i_oldflags; 1826cbff00fSChristoph Hellwig 183b83cc969SLi Zefan if (btrfs_root_readonly(root)) 184b83cc969SLi Zefan return -EROFS; 185b83cc969SLi Zefan 1866cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1876cbff00fSChristoph Hellwig return -EFAULT; 1886cbff00fSChristoph Hellwig 18975e7cb7fSLiu Bo ret = check_flags(flags); 19075e7cb7fSLiu Bo if (ret) 19175e7cb7fSLiu Bo return ret; 1926cbff00fSChristoph Hellwig 1932e149670SSerge E. Hallyn if (!inode_owner_or_capable(inode)) 1946cbff00fSChristoph Hellwig return -EACCES; 1956cbff00fSChristoph Hellwig 1966cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 1976cbff00fSChristoph Hellwig 198f062abf0SLi Zefan ip_oldflags = ip->flags; 199f062abf0SLi Zefan i_oldflags = inode->i_flags; 200f062abf0SLi Zefan 2016cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 2026cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 2036cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 2046cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 2056cbff00fSChristoph Hellwig ret = -EPERM; 2066cbff00fSChristoph Hellwig goto out_unlock; 2076cbff00fSChristoph Hellwig } 2086cbff00fSChristoph Hellwig } 2096cbff00fSChristoph Hellwig 210a561be71SAl Viro ret = mnt_want_write_file(file); 2116cbff00fSChristoph Hellwig if (ret) 2126cbff00fSChristoph Hellwig goto out_unlock; 2136cbff00fSChristoph Hellwig 2146cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 2156cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 2166cbff00fSChristoph Hellwig else 2176cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2186cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2196cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2206cbff00fSChristoph Hellwig else 2216cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2226cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2236cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2246cbff00fSChristoph Hellwig else 2256cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2266cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2276cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2286cbff00fSChristoph Hellwig else 2296cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2306cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2316cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2326cbff00fSChristoph Hellwig else 2336cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2346cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2356cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2366cbff00fSChristoph Hellwig else 2376cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 238e1e8fb6aSLi Zefan if (flags & FS_NOCOW_FL) 239e1e8fb6aSLi Zefan ip->flags |= BTRFS_INODE_NODATACOW; 240e1e8fb6aSLi Zefan else 241e1e8fb6aSLi Zefan ip->flags &= ~BTRFS_INODE_NODATACOW; 2426cbff00fSChristoph Hellwig 24375e7cb7fSLiu Bo /* 24475e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 24575e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 24675e7cb7fSLiu Bo * things smaller. 24775e7cb7fSLiu Bo */ 24875e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 24975e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 25075e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 25175e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 25275e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 25375e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 254ebcb904dSLi Zefan } else { 255ebcb904dSLi Zefan ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 25675e7cb7fSLiu Bo } 2576cbff00fSChristoph Hellwig 2584da6f1a3SLi Zefan trans = btrfs_start_transaction(root, 1); 259f062abf0SLi Zefan if (IS_ERR(trans)) { 260f062abf0SLi Zefan ret = PTR_ERR(trans); 261f062abf0SLi Zefan goto out_drop; 262f062abf0SLi Zefan } 2636cbff00fSChristoph Hellwig 264306424ccSLi Zefan btrfs_update_iflags(inode); 2650c4d2d95SJosef Bacik inode_inc_iversion(inode); 266306424ccSLi Zefan inode->i_ctime = CURRENT_TIME; 2676cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 2686cbff00fSChristoph Hellwig 2696cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 270f062abf0SLi Zefan out_drop: 271f062abf0SLi Zefan if (ret) { 272f062abf0SLi Zefan ip->flags = ip_oldflags; 273f062abf0SLi Zefan inode->i_flags = i_oldflags; 274f062abf0SLi Zefan } 2756cbff00fSChristoph Hellwig 2762a79f17eSAl Viro mnt_drop_write_file(file); 2776cbff00fSChristoph Hellwig out_unlock: 2786cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 2792d4e6f6aSliubo return ret; 2806cbff00fSChristoph Hellwig } 2816cbff00fSChristoph Hellwig 2826cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 2836cbff00fSChristoph Hellwig { 2846cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 2856cbff00fSChristoph Hellwig 2866cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 2876cbff00fSChristoph Hellwig } 288f46b5a66SChristoph Hellwig 289f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 290f7039b1dSLi Dongyang { 291815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(fdentry(file)->d_sb); 292f7039b1dSLi Dongyang struct btrfs_device *device; 293f7039b1dSLi Dongyang struct request_queue *q; 294f7039b1dSLi Dongyang struct fstrim_range range; 295f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 296f7039b1dSLi Dongyang u64 num_devices = 0; 297815745cfSAl Viro u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); 298f7039b1dSLi Dongyang int ret; 299f7039b1dSLi Dongyang 300f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 301f7039b1dSLi Dongyang return -EPERM; 302f7039b1dSLi Dongyang 3031f78160cSXiao Guangrong rcu_read_lock(); 3041f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 3051f78160cSXiao Guangrong dev_list) { 306f7039b1dSLi Dongyang if (!device->bdev) 307f7039b1dSLi Dongyang continue; 308f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 309f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 310f7039b1dSLi Dongyang num_devices++; 311f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 312f7039b1dSLi Dongyang minlen); 313f7039b1dSLi Dongyang } 314f7039b1dSLi Dongyang } 3151f78160cSXiao Guangrong rcu_read_unlock(); 316f4c697e6SLukas Czerner 317f7039b1dSLi Dongyang if (!num_devices) 318f7039b1dSLi Dongyang return -EOPNOTSUPP; 319f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 320f7039b1dSLi Dongyang return -EFAULT; 321f4c697e6SLukas Czerner if (range.start > total_bytes) 322f4c697e6SLukas Czerner return -EINVAL; 323f7039b1dSLi Dongyang 324f4c697e6SLukas Czerner range.len = min(range.len, total_bytes - range.start); 325f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 326815745cfSAl Viro ret = btrfs_trim_fs(fs_info->tree_root, &range); 327f7039b1dSLi Dongyang if (ret < 0) 328f7039b1dSLi Dongyang return ret; 329f7039b1dSLi Dongyang 330f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 331f7039b1dSLi Dongyang return -EFAULT; 332f7039b1dSLi Dongyang 333f7039b1dSLi Dongyang return 0; 334f7039b1dSLi Dongyang } 335f7039b1dSLi Dongyang 336cb8e7090SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, 337cb8e7090SChristoph Hellwig struct dentry *dentry, 33872fd032eSSage Weil char *name, int namelen, 33972fd032eSSage Weil u64 *async_transid) 340f46b5a66SChristoph Hellwig { 341f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 342f46b5a66SChristoph Hellwig struct btrfs_key key; 343f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 344f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 345f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 34676dda93cSYan, Zheng struct btrfs_root *new_root; 3472fbe8c8aSAl Viro struct dentry *parent = dentry->d_parent; 3486a912213SJosef Bacik struct inode *dir; 349f46b5a66SChristoph Hellwig int ret; 350f46b5a66SChristoph Hellwig int err; 351f46b5a66SChristoph Hellwig u64 objectid; 352f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 3533de4586cSChris Mason u64 index = 0; 354f46b5a66SChristoph Hellwig 355581bb050SLi Zefan ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); 3562fbe8c8aSAl Viro if (ret) 357a22285a6SYan, Zheng return ret; 3586a912213SJosef Bacik 3596a912213SJosef Bacik dir = parent->d_inode; 3606a912213SJosef Bacik 3619ed74f2dSJosef Bacik /* 3629ed74f2dSJosef Bacik * 1 - inode item 3639ed74f2dSJosef Bacik * 2 - refs 3649ed74f2dSJosef Bacik * 1 - root item 3659ed74f2dSJosef Bacik * 2 - dir items 3669ed74f2dSJosef Bacik */ 367a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 6); 3682fbe8c8aSAl Viro if (IS_ERR(trans)) 369a22285a6SYan, Zheng return PTR_ERR(trans); 370f46b5a66SChristoph Hellwig 3715d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 3725581a51aSJan Schmidt 0, objectid, NULL, 0, 0, 0); 3738e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 3748e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 3758e8a1e31SJosef Bacik goto fail; 3768e8a1e31SJosef Bacik } 377f46b5a66SChristoph Hellwig 3785d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 379f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 380f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 3815d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 382f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 383f46b5a66SChristoph Hellwig 384f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 385f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 386f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 3875d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 3885d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 3895d4f98a2SYan Zheng BTRFS_UUID_SIZE); 390f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 391f46b5a66SChristoph Hellwig 392f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 393f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 394f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 395f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 396f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 397a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 398f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 399f46b5a66SChristoph Hellwig 40008fe4db1SLi Zefan root_item.flags = 0; 40108fe4db1SLi Zefan root_item.byte_limit = 0; 40208fe4db1SLi Zefan inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT); 40308fe4db1SLi Zefan 404f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 40584234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 406f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 407f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 40886b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 40980ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 410f46b5a66SChristoph Hellwig 411f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 412f46b5a66SChristoph Hellwig root_item.drop_level = 0; 413f46b5a66SChristoph Hellwig 414925baeddSChris Mason btrfs_tree_unlock(leaf); 415f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 416f46b5a66SChristoph Hellwig leaf = NULL; 417f46b5a66SChristoph Hellwig 418f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 419f46b5a66SChristoph Hellwig 420f46b5a66SChristoph Hellwig key.objectid = objectid; 4215d4f98a2SYan Zheng key.offset = 0; 422f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 423f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 424f46b5a66SChristoph Hellwig &root_item); 425f46b5a66SChristoph Hellwig if (ret) 426f46b5a66SChristoph Hellwig goto fail; 427f46b5a66SChristoph Hellwig 42876dda93cSYan, Zheng key.offset = (u64)-1; 42976dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 43079787eaaSJeff Mahoney if (IS_ERR(new_root)) { 43179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); 43279787eaaSJeff Mahoney ret = PTR_ERR(new_root); 43379787eaaSJeff Mahoney goto fail; 43479787eaaSJeff Mahoney } 43576dda93cSYan, Zheng 43676dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 43776dda93cSYan, Zheng 438d82a6f1dSJosef Bacik ret = btrfs_create_subvol_root(trans, new_root, new_dirid); 439ce598979SMark Fasheh if (ret) { 440ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 44179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 442ce598979SMark Fasheh goto fail; 443ce598979SMark Fasheh } 444ce598979SMark Fasheh 445f46b5a66SChristoph Hellwig /* 446f46b5a66SChristoph Hellwig * insert the directory item 447f46b5a66SChristoph Hellwig */ 4483de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 44979787eaaSJeff Mahoney if (ret) { 45079787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 45179787eaaSJeff Mahoney goto fail; 45279787eaaSJeff Mahoney } 4533de4586cSChris Mason 4543de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 45516cdcec7SMiao Xie name, namelen, dir, &key, 4563de4586cSChris Mason BTRFS_FT_DIR, index); 45779787eaaSJeff Mahoney if (ret) { 45879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 459f46b5a66SChristoph Hellwig goto fail; 46079787eaaSJeff Mahoney } 4610660b5afSChris Mason 46252c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 46352c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 46452c26179SYan Zheng BUG_ON(ret); 46552c26179SYan Zheng 4660660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 4674df27c4dSYan, Zheng objectid, root->root_key.objectid, 46833345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 46976dda93cSYan, Zheng 4700660b5afSChris Mason BUG_ON(ret); 4710660b5afSChris Mason 47276dda93cSYan, Zheng d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 473f46b5a66SChristoph Hellwig fail: 47472fd032eSSage Weil if (async_transid) { 47572fd032eSSage Weil *async_transid = trans->transid; 47672fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 47772fd032eSSage Weil } else { 47876dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 47972fd032eSSage Weil } 480f46b5a66SChristoph Hellwig if (err && !ret) 481f46b5a66SChristoph Hellwig ret = err; 482f46b5a66SChristoph Hellwig return ret; 483f46b5a66SChristoph Hellwig } 484f46b5a66SChristoph Hellwig 48572fd032eSSage Weil static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 486b83cc969SLi Zefan char *name, int namelen, u64 *async_transid, 487b83cc969SLi Zefan bool readonly) 488f46b5a66SChristoph Hellwig { 4892e4bfab9SYan, Zheng struct inode *inode; 490f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 491f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 4922e4bfab9SYan, Zheng int ret; 493f46b5a66SChristoph Hellwig 494f46b5a66SChristoph Hellwig if (!root->ref_cows) 495f46b5a66SChristoph Hellwig return -EINVAL; 496f46b5a66SChristoph Hellwig 497a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 498a22285a6SYan, Zheng if (!pending_snapshot) 499a22285a6SYan, Zheng return -ENOMEM; 500a22285a6SYan, Zheng 501a22285a6SYan, Zheng btrfs_init_block_rsv(&pending_snapshot->block_rsv); 502a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 503a22285a6SYan, Zheng pending_snapshot->root = root; 504b83cc969SLi Zefan pending_snapshot->readonly = readonly; 505a22285a6SYan, Zheng 506a22285a6SYan, Zheng trans = btrfs_start_transaction(root->fs_info->extent_root, 5); 507a22285a6SYan, Zheng if (IS_ERR(trans)) { 508a22285a6SYan, Zheng ret = PTR_ERR(trans); 509a22285a6SYan, Zheng goto fail; 510a22285a6SYan, Zheng } 511a22285a6SYan, Zheng 512a22285a6SYan, Zheng ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); 513a22285a6SYan, Zheng BUG_ON(ret); 514a22285a6SYan, Zheng 5158351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 516a22285a6SYan, Zheng list_add(&pending_snapshot->list, 517a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 5188351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 51972fd032eSSage Weil if (async_transid) { 52072fd032eSSage Weil *async_transid = trans->transid; 52172fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 52272fd032eSSage Weil root->fs_info->extent_root, 1); 52372fd032eSSage Weil } else { 52472fd032eSSage Weil ret = btrfs_commit_transaction(trans, 52572fd032eSSage Weil root->fs_info->extent_root); 52672fd032eSSage Weil } 527a22285a6SYan, Zheng BUG_ON(ret); 528a22285a6SYan, Zheng 529a22285a6SYan, Zheng ret = pending_snapshot->error; 530f46b5a66SChristoph Hellwig if (ret) 5312e4bfab9SYan, Zheng goto fail; 532f46b5a66SChristoph Hellwig 53366b4ffd1SJosef Bacik ret = btrfs_orphan_cleanup(pending_snapshot->snap); 53466b4ffd1SJosef Bacik if (ret) 53566b4ffd1SJosef Bacik goto fail; 536f46b5a66SChristoph Hellwig 5372fbe8c8aSAl Viro inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 5382e4bfab9SYan, Zheng if (IS_ERR(inode)) { 5392e4bfab9SYan, Zheng ret = PTR_ERR(inode); 5402e4bfab9SYan, Zheng goto fail; 5412e4bfab9SYan, Zheng } 5422e4bfab9SYan, Zheng BUG_ON(!inode); 5432e4bfab9SYan, Zheng d_instantiate(dentry, inode); 5442e4bfab9SYan, Zheng ret = 0; 5452e4bfab9SYan, Zheng fail: 546a22285a6SYan, Zheng kfree(pending_snapshot); 547f46b5a66SChristoph Hellwig return ret; 548f46b5a66SChristoph Hellwig } 549f46b5a66SChristoph Hellwig 5504260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 5514260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 5524260f7c7SSage Weil * minimal. 5534260f7c7SSage Weil */ 5544260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 5554260f7c7SSage Weil { 5564260f7c7SSage Weil uid_t fsuid = current_fsuid(); 5574260f7c7SSage Weil 5584260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 5594260f7c7SSage Weil return 0; 5604260f7c7SSage Weil if (inode->i_uid == fsuid) 5614260f7c7SSage Weil return 0; 5624260f7c7SSage Weil if (dir->i_uid == fsuid) 5634260f7c7SSage Weil return 0; 5644260f7c7SSage Weil return !capable(CAP_FOWNER); 5654260f7c7SSage Weil } 5664260f7c7SSage Weil 5674260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 5684260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 5694260f7c7SSage Weil * whether the type of victim is right. 5704260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 5714260f7c7SSage Weil * 2. We should have write and exec permissions on dir 5724260f7c7SSage Weil * 3. We can't remove anything from append-only dir 5734260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 5744260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 5754260f7c7SSage Weil * a. be owner of dir, or 5764260f7c7SSage Weil * b. be owner of victim, or 5774260f7c7SSage Weil * c. have CAP_FOWNER capability 5784260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 5794260f7c7SSage Weil * links pointing to it. 5804260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 5814260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 5824260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 5834260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 5844260f7c7SSage Weil * nfs_async_unlink(). 5854260f7c7SSage Weil */ 5864260f7c7SSage Weil 5874260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) 5884260f7c7SSage Weil { 5894260f7c7SSage Weil int error; 5904260f7c7SSage Weil 5914260f7c7SSage Weil if (!victim->d_inode) 5924260f7c7SSage Weil return -ENOENT; 5934260f7c7SSage Weil 5944260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 5954260f7c7SSage Weil audit_inode_child(victim, dir); 5964260f7c7SSage Weil 5974260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 5984260f7c7SSage Weil if (error) 5994260f7c7SSage Weil return error; 6004260f7c7SSage Weil if (IS_APPEND(dir)) 6014260f7c7SSage Weil return -EPERM; 6024260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 6034260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 6044260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 6054260f7c7SSage Weil return -EPERM; 6064260f7c7SSage Weil if (isdir) { 6074260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 6084260f7c7SSage Weil return -ENOTDIR; 6094260f7c7SSage Weil if (IS_ROOT(victim)) 6104260f7c7SSage Weil return -EBUSY; 6114260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 6124260f7c7SSage Weil return -EISDIR; 6134260f7c7SSage Weil if (IS_DEADDIR(dir)) 6144260f7c7SSage Weil return -ENOENT; 6154260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 6164260f7c7SSage Weil return -EBUSY; 6174260f7c7SSage Weil return 0; 6184260f7c7SSage Weil } 6194260f7c7SSage Weil 620cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 621cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 622cb8e7090SChristoph Hellwig { 623cb8e7090SChristoph Hellwig if (child->d_inode) 624cb8e7090SChristoph Hellwig return -EEXIST; 625cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 626cb8e7090SChristoph Hellwig return -ENOENT; 627cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 628cb8e7090SChristoph Hellwig } 629cb8e7090SChristoph Hellwig 630cb8e7090SChristoph Hellwig /* 631cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 632cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 633cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 634cb8e7090SChristoph Hellwig */ 63576dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 63676dda93cSYan, Zheng char *name, int namelen, 63772fd032eSSage Weil struct btrfs_root *snap_src, 638b83cc969SLi Zefan u64 *async_transid, bool readonly) 639cb8e7090SChristoph Hellwig { 64076dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 641cb8e7090SChristoph Hellwig struct dentry *dentry; 642cb8e7090SChristoph Hellwig int error; 643cb8e7090SChristoph Hellwig 64476dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 645cb8e7090SChristoph Hellwig 646cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 647cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 648cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 649cb8e7090SChristoph Hellwig goto out_unlock; 650cb8e7090SChristoph Hellwig 651cb8e7090SChristoph Hellwig error = -EEXIST; 652cb8e7090SChristoph Hellwig if (dentry->d_inode) 653cb8e7090SChristoph Hellwig goto out_dput; 654cb8e7090SChristoph Hellwig 655cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 656cb8e7090SChristoph Hellwig if (error) 657cb8e7090SChristoph Hellwig goto out_dput; 658cb8e7090SChristoph Hellwig 65976dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 660cb8e7090SChristoph Hellwig if (error) 661cb8e7090SChristoph Hellwig goto out_drop_write; 662cb8e7090SChristoph Hellwig 66376dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 66476dda93cSYan, Zheng 66576dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 66676dda93cSYan, Zheng goto out_up_read; 66776dda93cSYan, Zheng 6683de4586cSChris Mason if (snap_src) { 66972fd032eSSage Weil error = create_snapshot(snap_src, dentry, 670b83cc969SLi Zefan name, namelen, async_transid, readonly); 6713de4586cSChris Mason } else { 67276dda93cSYan, Zheng error = create_subvol(BTRFS_I(dir)->root, dentry, 67372fd032eSSage Weil name, namelen, async_transid); 6743de4586cSChris Mason } 67576dda93cSYan, Zheng if (!error) 67676dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 67776dda93cSYan, Zheng out_up_read: 67876dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 679cb8e7090SChristoph Hellwig out_drop_write: 680cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 681cb8e7090SChristoph Hellwig out_dput: 682cb8e7090SChristoph Hellwig dput(dentry); 683cb8e7090SChristoph Hellwig out_unlock: 68476dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 685cb8e7090SChristoph Hellwig return error; 686cb8e7090SChristoph Hellwig } 687cb8e7090SChristoph Hellwig 6884cb5300bSChris Mason /* 6894cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 6904cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 6914cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 6924cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 6934cb5300bSChris Mason * part of the file 6944cb5300bSChris Mason */ 6954cb5300bSChris Mason static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) 6964cb5300bSChris Mason { 6974cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 6984cb5300bSChris Mason struct extent_map *em = NULL; 6994cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 7004cb5300bSChris Mason u64 end; 7014cb5300bSChris Mason 7024cb5300bSChris Mason read_lock(&em_tree->lock); 7034cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 7044cb5300bSChris Mason read_unlock(&em_tree->lock); 7054cb5300bSChris Mason 7064cb5300bSChris Mason if (em) { 7074cb5300bSChris Mason end = extent_map_end(em); 7084cb5300bSChris Mason free_extent_map(em); 7094cb5300bSChris Mason if (end - offset > thresh) 7104cb5300bSChris Mason return 0; 7114cb5300bSChris Mason } 7124cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 7134cb5300bSChris Mason thresh /= 2; 7144cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 7154cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 7164cb5300bSChris Mason if (end >= thresh) 7174cb5300bSChris Mason return 0; 7184cb5300bSChris Mason return 1; 7194cb5300bSChris Mason } 7204cb5300bSChris Mason 7214cb5300bSChris Mason /* 7224cb5300bSChris Mason * helper function to walk through a file and find extents 7234cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 7244cb5300bSChris Mason * 7254cb5300bSChris Mason * This is used by the defragging code to find new and small 7264cb5300bSChris Mason * extents 7274cb5300bSChris Mason */ 7284cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 7294cb5300bSChris Mason struct inode *inode, u64 newer_than, 7304cb5300bSChris Mason u64 *off, int thresh) 7314cb5300bSChris Mason { 7324cb5300bSChris Mason struct btrfs_path *path; 7334cb5300bSChris Mason struct btrfs_key min_key; 7344cb5300bSChris Mason struct btrfs_key max_key; 7354cb5300bSChris Mason struct extent_buffer *leaf; 7364cb5300bSChris Mason struct btrfs_file_extent_item *extent; 7374cb5300bSChris Mason int type; 7384cb5300bSChris Mason int ret; 739a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 7404cb5300bSChris Mason 7414cb5300bSChris Mason path = btrfs_alloc_path(); 7424cb5300bSChris Mason if (!path) 7434cb5300bSChris Mason return -ENOMEM; 7444cb5300bSChris Mason 745a4689d2bSDavid Sterba min_key.objectid = ino; 7464cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 7474cb5300bSChris Mason min_key.offset = *off; 7484cb5300bSChris Mason 749a4689d2bSDavid Sterba max_key.objectid = ino; 7504cb5300bSChris Mason max_key.type = (u8)-1; 7514cb5300bSChris Mason max_key.offset = (u64)-1; 7524cb5300bSChris Mason 7534cb5300bSChris Mason path->keep_locks = 1; 7544cb5300bSChris Mason 7554cb5300bSChris Mason while(1) { 7564cb5300bSChris Mason ret = btrfs_search_forward(root, &min_key, &max_key, 7574cb5300bSChris Mason path, 0, newer_than); 7584cb5300bSChris Mason if (ret != 0) 7594cb5300bSChris Mason goto none; 760a4689d2bSDavid Sterba if (min_key.objectid != ino) 7614cb5300bSChris Mason goto none; 7624cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 7634cb5300bSChris Mason goto none; 7644cb5300bSChris Mason 7654cb5300bSChris Mason leaf = path->nodes[0]; 7664cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 7674cb5300bSChris Mason struct btrfs_file_extent_item); 7684cb5300bSChris Mason 7694cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 7704cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 7714cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 7724cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 7734cb5300bSChris Mason *off = min_key.offset; 7744cb5300bSChris Mason btrfs_free_path(path); 7754cb5300bSChris Mason return 0; 7764cb5300bSChris Mason } 7774cb5300bSChris Mason 7784cb5300bSChris Mason if (min_key.offset == (u64)-1) 7794cb5300bSChris Mason goto none; 7804cb5300bSChris Mason 7814cb5300bSChris Mason min_key.offset++; 7824cb5300bSChris Mason btrfs_release_path(path); 7834cb5300bSChris Mason } 7844cb5300bSChris Mason none: 7854cb5300bSChris Mason btrfs_free_path(path); 7864cb5300bSChris Mason return -ENOENT; 7874cb5300bSChris Mason } 7884cb5300bSChris Mason 78917ce6ef8SLiu Bo /* 79017ce6ef8SLiu Bo * Validaty check of prev em and next em: 79117ce6ef8SLiu Bo * 1) no prev/next em 79217ce6ef8SLiu Bo * 2) prev/next em is an hole/inline extent 79317ce6ef8SLiu Bo */ 79417ce6ef8SLiu Bo static int check_adjacent_extents(struct inode *inode, struct extent_map *em) 79517ce6ef8SLiu Bo { 79617ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 79717ce6ef8SLiu Bo struct extent_map *prev = NULL, *next = NULL; 79817ce6ef8SLiu Bo int ret = 0; 79917ce6ef8SLiu Bo 80017ce6ef8SLiu Bo read_lock(&em_tree->lock); 80117ce6ef8SLiu Bo prev = lookup_extent_mapping(em_tree, em->start - 1, (u64)-1); 80217ce6ef8SLiu Bo next = lookup_extent_mapping(em_tree, em->start + em->len, (u64)-1); 80317ce6ef8SLiu Bo read_unlock(&em_tree->lock); 80417ce6ef8SLiu Bo 80517ce6ef8SLiu Bo if ((!prev || prev->block_start >= EXTENT_MAP_LAST_BYTE) && 80617ce6ef8SLiu Bo (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)) 80717ce6ef8SLiu Bo ret = 1; 80817ce6ef8SLiu Bo free_extent_map(prev); 80917ce6ef8SLiu Bo free_extent_map(next); 81017ce6ef8SLiu Bo 81117ce6ef8SLiu Bo return ret; 81217ce6ef8SLiu Bo } 81317ce6ef8SLiu Bo 814940100a4SChris Mason static int should_defrag_range(struct inode *inode, u64 start, u64 len, 8151e701a32SChris Mason int thresh, u64 *last_len, u64 *skip, 8161e701a32SChris Mason u64 *defrag_end) 817940100a4SChris Mason { 818940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 819940100a4SChris Mason struct extent_map *em = NULL; 820940100a4SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 821940100a4SChris Mason int ret = 1; 822940100a4SChris Mason 823940100a4SChris Mason /* 824008873eaSLi Zefan * make sure that once we start defragging an extent, we keep on 825940100a4SChris Mason * defragging it 826940100a4SChris Mason */ 827940100a4SChris Mason if (start < *defrag_end) 828940100a4SChris Mason return 1; 829940100a4SChris Mason 830940100a4SChris Mason *skip = 0; 831940100a4SChris Mason 832940100a4SChris Mason /* 833940100a4SChris Mason * hopefully we have this extent in the tree already, try without 834940100a4SChris Mason * the full extent lock 835940100a4SChris Mason */ 836940100a4SChris Mason read_lock(&em_tree->lock); 837940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 838940100a4SChris Mason read_unlock(&em_tree->lock); 839940100a4SChris Mason 840940100a4SChris Mason if (!em) { 841940100a4SChris Mason /* get the big lock and read metadata off disk */ 842d0082371SJeff Mahoney lock_extent(io_tree, start, start + len - 1); 843940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 844d0082371SJeff Mahoney unlock_extent(io_tree, start, start + len - 1); 845940100a4SChris Mason 8466cf8bfbfSDan Carpenter if (IS_ERR(em)) 847940100a4SChris Mason return 0; 848940100a4SChris Mason } 849940100a4SChris Mason 850940100a4SChris Mason /* this will cover holes, and inline extents */ 85117ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 852940100a4SChris Mason ret = 0; 85317ce6ef8SLiu Bo goto out; 85417ce6ef8SLiu Bo } 85517ce6ef8SLiu Bo 85617ce6ef8SLiu Bo /* If we have nothing to merge with us, just skip. */ 85717ce6ef8SLiu Bo if (check_adjacent_extents(inode, em)) { 85817ce6ef8SLiu Bo ret = 0; 85917ce6ef8SLiu Bo goto out; 86017ce6ef8SLiu Bo } 861940100a4SChris Mason 862940100a4SChris Mason /* 863940100a4SChris Mason * we hit a real extent, if it is big don't bother defragging it again 864940100a4SChris Mason */ 8651e701a32SChris Mason if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh) 866940100a4SChris Mason ret = 0; 867940100a4SChris Mason 86817ce6ef8SLiu Bo out: 869940100a4SChris Mason /* 870940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 871940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 872940100a4SChris Mason * so that the next tiny extent will force a defrag. 873940100a4SChris Mason * 874940100a4SChris Mason * The end result of this is that tiny extents before a single big 875940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 876940100a4SChris Mason */ 877940100a4SChris Mason if (ret) { 878940100a4SChris Mason *defrag_end = extent_map_end(em); 879940100a4SChris Mason } else { 880940100a4SChris Mason *last_len = 0; 881940100a4SChris Mason *skip = extent_map_end(em); 882940100a4SChris Mason *defrag_end = 0; 883940100a4SChris Mason } 884940100a4SChris Mason 885940100a4SChris Mason free_extent_map(em); 886940100a4SChris Mason return ret; 887940100a4SChris Mason } 888940100a4SChris Mason 8894cb5300bSChris Mason /* 8904cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 8914cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 8924cb5300bSChris Mason * to COW and defrag. 8934cb5300bSChris Mason * 8944cb5300bSChris Mason * It also makes sure the delalloc code has enough 8954cb5300bSChris Mason * dirty data to avoid making new small extents as part 8964cb5300bSChris Mason * of the defrag 8974cb5300bSChris Mason * 8984cb5300bSChris Mason * It's a good idea to start RA on this range 8994cb5300bSChris Mason * before calling this. 9004cb5300bSChris Mason */ 9014cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 9024cb5300bSChris Mason struct page **pages, 9034cb5300bSChris Mason unsigned long start_index, 9044cb5300bSChris Mason int num_pages) 905f46b5a66SChristoph Hellwig { 9064cb5300bSChris Mason unsigned long file_end; 9074cb5300bSChris Mason u64 isize = i_size_read(inode); 908f46b5a66SChristoph Hellwig u64 page_start; 909f46b5a66SChristoph Hellwig u64 page_end; 9101f12bd06SLiu Bo u64 page_cnt; 9114cb5300bSChris Mason int ret; 9124cb5300bSChris Mason int i; 9134cb5300bSChris Mason int i_done; 9144cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 9154cb5300bSChris Mason struct extent_state *cached_state = NULL; 916600a45e1SMiao Xie struct extent_io_tree *tree; 9173b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 9184cb5300bSChris Mason 9194cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 9201f12bd06SLiu Bo if (!isize || start_index > file_end) 9211f12bd06SLiu Bo return 0; 9221f12bd06SLiu Bo 9231f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 9244cb5300bSChris Mason 9254cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 9261f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 9274cb5300bSChris Mason if (ret) 9284cb5300bSChris Mason return ret; 9294cb5300bSChris Mason i_done = 0; 930600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 9314cb5300bSChris Mason 9324cb5300bSChris Mason /* step one, lock all the pages */ 9331f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 9344cb5300bSChris Mason struct page *page; 935600a45e1SMiao Xie again: 936a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 9373b16a4e3SJosef Bacik start_index + i, mask); 9384cb5300bSChris Mason if (!page) 9394cb5300bSChris Mason break; 9404cb5300bSChris Mason 941600a45e1SMiao Xie page_start = page_offset(page); 942600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 943600a45e1SMiao Xie while (1) { 944d0082371SJeff Mahoney lock_extent(tree, page_start, page_end); 945600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 946600a45e1SMiao Xie page_start); 947d0082371SJeff Mahoney unlock_extent(tree, page_start, page_end); 948600a45e1SMiao Xie if (!ordered) 949600a45e1SMiao Xie break; 950600a45e1SMiao Xie 951600a45e1SMiao Xie unlock_page(page); 952600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 953600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 954600a45e1SMiao Xie lock_page(page); 9551f12bd06SLiu Bo /* 9561f12bd06SLiu Bo * we unlocked the page above, so we need check if 9571f12bd06SLiu Bo * it was released or not. 9581f12bd06SLiu Bo */ 9591f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 9601f12bd06SLiu Bo unlock_page(page); 9611f12bd06SLiu Bo page_cache_release(page); 9621f12bd06SLiu Bo goto again; 9631f12bd06SLiu Bo } 964600a45e1SMiao Xie } 965600a45e1SMiao Xie 9664cb5300bSChris Mason if (!PageUptodate(page)) { 9674cb5300bSChris Mason btrfs_readpage(NULL, page); 9684cb5300bSChris Mason lock_page(page); 9694cb5300bSChris Mason if (!PageUptodate(page)) { 9704cb5300bSChris Mason unlock_page(page); 9714cb5300bSChris Mason page_cache_release(page); 9724cb5300bSChris Mason ret = -EIO; 9734cb5300bSChris Mason break; 9744cb5300bSChris Mason } 9754cb5300bSChris Mason } 976600a45e1SMiao Xie 977600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 978600a45e1SMiao Xie unlock_page(page); 979600a45e1SMiao Xie page_cache_release(page); 980600a45e1SMiao Xie goto again; 981600a45e1SMiao Xie } 982600a45e1SMiao Xie 9834cb5300bSChris Mason pages[i] = page; 9844cb5300bSChris Mason i_done++; 9854cb5300bSChris Mason } 9864cb5300bSChris Mason if (!i_done || ret) 9874cb5300bSChris Mason goto out; 9884cb5300bSChris Mason 9894cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 9904cb5300bSChris Mason goto out; 9914cb5300bSChris Mason 9924cb5300bSChris Mason /* 9934cb5300bSChris Mason * so now we have a nice long stream of locked 9944cb5300bSChris Mason * and up to date pages, lets wait on them 9954cb5300bSChris Mason */ 9964cb5300bSChris Mason for (i = 0; i < i_done; i++) 9974cb5300bSChris Mason wait_on_page_writeback(pages[i]); 9984cb5300bSChris Mason 9994cb5300bSChris Mason page_start = page_offset(pages[0]); 10004cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 10014cb5300bSChris Mason 10024cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1003d0082371SJeff Mahoney page_start, page_end - 1, 0, &cached_state); 10044cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 10054cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 10064cb5300bSChris Mason EXTENT_DO_ACCOUNTING, 0, 0, &cached_state, 10074cb5300bSChris Mason GFP_NOFS); 10084cb5300bSChris Mason 10091f12bd06SLiu Bo if (i_done != page_cnt) { 10109e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 10119e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 10129e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 10134cb5300bSChris Mason btrfs_delalloc_release_space(inode, 10141f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 10154cb5300bSChris Mason } 10164cb5300bSChris Mason 10174cb5300bSChris Mason 10184cb5300bSChris Mason btrfs_set_extent_delalloc(inode, page_start, page_end - 1, 10194cb5300bSChris Mason &cached_state); 10204cb5300bSChris Mason 10214cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 10224cb5300bSChris Mason page_start, page_end - 1, &cached_state, 10234cb5300bSChris Mason GFP_NOFS); 10244cb5300bSChris Mason 10254cb5300bSChris Mason for (i = 0; i < i_done; i++) { 10264cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 10274cb5300bSChris Mason ClearPageChecked(pages[i]); 10284cb5300bSChris Mason set_page_extent_mapped(pages[i]); 10294cb5300bSChris Mason set_page_dirty(pages[i]); 10304cb5300bSChris Mason unlock_page(pages[i]); 10314cb5300bSChris Mason page_cache_release(pages[i]); 10324cb5300bSChris Mason } 10334cb5300bSChris Mason return i_done; 10344cb5300bSChris Mason out: 10354cb5300bSChris Mason for (i = 0; i < i_done; i++) { 10364cb5300bSChris Mason unlock_page(pages[i]); 10374cb5300bSChris Mason page_cache_release(pages[i]); 10384cb5300bSChris Mason } 10391f12bd06SLiu Bo btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); 10404cb5300bSChris Mason return ret; 10414cb5300bSChris Mason 10424cb5300bSChris Mason } 10434cb5300bSChris Mason 10444cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 10454cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 10464cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 10474cb5300bSChris Mason { 10484cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 10494cb5300bSChris Mason struct btrfs_super_block *disk_super; 10504cb5300bSChris Mason struct file_ra_state *ra = NULL; 10514cb5300bSChris Mason unsigned long last_index; 1052151a31b2SLi Zefan u64 isize = i_size_read(inode); 10534cb5300bSChris Mason u64 features; 1054940100a4SChris Mason u64 last_len = 0; 1055940100a4SChris Mason u64 skip = 0; 1056940100a4SChris Mason u64 defrag_end = 0; 10574cb5300bSChris Mason u64 newer_off = range->start; 1058f46b5a66SChristoph Hellwig unsigned long i; 1059008873eaSLi Zefan unsigned long ra_index = 0; 1060f46b5a66SChristoph Hellwig int ret; 10614cb5300bSChris Mason int defrag_count = 0; 10621a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 10634cb5300bSChris Mason int extent_thresh = range->extent_thresh; 1064008873eaSLi Zefan int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; 1065008873eaSLi Zefan int cluster = max_cluster; 10664cb5300bSChris Mason u64 new_align = ~((u64)128 * 1024 - 1); 10674cb5300bSChris Mason struct page **pages = NULL; 10684cb5300bSChris Mason 10694cb5300bSChris Mason if (extent_thresh == 0) 10704cb5300bSChris Mason extent_thresh = 256 * 1024; 10711a419d85SLi Zefan 10721a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 10731a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 10741a419d85SLi Zefan return -EINVAL; 10751a419d85SLi Zefan if (range->compress_type) 10761a419d85SLi Zefan compress_type = range->compress_type; 10771a419d85SLi Zefan } 1078f46b5a66SChristoph Hellwig 1079151a31b2SLi Zefan if (isize == 0) 1080940100a4SChris Mason return 0; 1081f46b5a66SChristoph Hellwig 10824cb5300bSChris Mason /* 10834cb5300bSChris Mason * if we were not given a file, allocate a readahead 10844cb5300bSChris Mason * context 10854cb5300bSChris Mason */ 10864cb5300bSChris Mason if (!file) { 10874cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 10884cb5300bSChris Mason if (!ra) 10894cb5300bSChris Mason return -ENOMEM; 10904cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 10914cb5300bSChris Mason } else { 10924cb5300bSChris Mason ra = &file->f_ra; 10934cb5300bSChris Mason } 10944cb5300bSChris Mason 1095008873eaSLi Zefan pages = kmalloc(sizeof(struct page *) * max_cluster, 10964cb5300bSChris Mason GFP_NOFS); 10974cb5300bSChris Mason if (!pages) { 10984cb5300bSChris Mason ret = -ENOMEM; 10994cb5300bSChris Mason goto out_ra; 11004cb5300bSChris Mason } 11014cb5300bSChris Mason 11024cb5300bSChris Mason /* find the last page to defrag */ 11031e701a32SChris Mason if (range->start + range->len > range->start) { 1104151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 11051e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 11061e701a32SChris Mason } else { 1107151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 11081e701a32SChris Mason } 11091e701a32SChris Mason 11104cb5300bSChris Mason if (newer_than) { 11114cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 11124cb5300bSChris Mason &newer_off, 64 * 1024); 11134cb5300bSChris Mason if (!ret) { 11144cb5300bSChris Mason range->start = newer_off; 11154cb5300bSChris Mason /* 11164cb5300bSChris Mason * we always align our defrag to help keep 11174cb5300bSChris Mason * the extents in the file evenly spaced 11184cb5300bSChris Mason */ 11194cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 11204cb5300bSChris Mason } else 11214cb5300bSChris Mason goto out_ra; 11224cb5300bSChris Mason } else { 11231e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 11244cb5300bSChris Mason } 11254cb5300bSChris Mason if (!max_to_defrag) 11267ec31b54SLiu Bo max_to_defrag = last_index + 1; 11274cb5300bSChris Mason 11282a0f7f57SLi Zefan /* 11292a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 11302a0f7f57SLi Zefan * written sequentially. 11312a0f7f57SLi Zefan */ 11322a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 11332a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 11342a0f7f57SLi Zefan 1135f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1136f7f43cc8SChris Mason (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> 1137f7f43cc8SChris Mason PAGE_CACHE_SHIFT)) { 11384cb5300bSChris Mason /* 11394cb5300bSChris Mason * make sure we stop running if someone unmounts 11404cb5300bSChris Mason * the FS 11414cb5300bSChris Mason */ 11424cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 11434cb5300bSChris Mason break; 11444cb5300bSChris Mason 114566c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 114666c26892SLiu Bo PAGE_CACHE_SIZE, extent_thresh, 114766c26892SLiu Bo &last_len, &skip, &defrag_end)) { 1148940100a4SChris Mason unsigned long next; 1149940100a4SChris Mason /* 1150940100a4SChris Mason * the should_defrag function tells us how much to skip 1151940100a4SChris Mason * bump our counter by the suggested amount 1152940100a4SChris Mason */ 1153940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 1154940100a4SChris Mason i = max(i + 1, next); 1155940100a4SChris Mason continue; 1156940100a4SChris Mason } 1157008873eaSLi Zefan 1158008873eaSLi Zefan if (!newer_than) { 1159008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1160008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1161008873eaSLi Zefan cluster = min(cluster, max_cluster); 1162008873eaSLi Zefan } else { 1163008873eaSLi Zefan cluster = max_cluster; 1164008873eaSLi Zefan } 1165008873eaSLi Zefan 11661e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 11671a419d85SLi Zefan BTRFS_I(inode)->force_compress = compress_type; 1168940100a4SChris Mason 1169008873eaSLi Zefan if (i + cluster > ra_index) { 1170008873eaSLi Zefan ra_index = max(i, ra_index); 1171008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1172008873eaSLi Zefan cluster); 1173008873eaSLi Zefan ra_index += max_cluster; 1174008873eaSLi Zefan } 11754cb5300bSChris Mason 1176ecb8bea8SLiu Bo mutex_lock(&inode->i_mutex); 1177008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1178ecb8bea8SLiu Bo if (ret < 0) { 1179ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 11804cb5300bSChris Mason goto out_ra; 1181ecb8bea8SLiu Bo } 11824cb5300bSChris Mason 11834cb5300bSChris Mason defrag_count += ret; 11844cb5300bSChris Mason balance_dirty_pages_ratelimited_nr(inode->i_mapping, ret); 1185ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 11864cb5300bSChris Mason 11874cb5300bSChris Mason if (newer_than) { 11884cb5300bSChris Mason if (newer_off == (u64)-1) 11894cb5300bSChris Mason break; 11904cb5300bSChris Mason 1191e1f041e1SLiu Bo if (ret > 0) 1192e1f041e1SLiu Bo i += ret; 1193e1f041e1SLiu Bo 11944cb5300bSChris Mason newer_off = max(newer_off + 1, 11954cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 11964cb5300bSChris Mason 11974cb5300bSChris Mason ret = find_new_extents(root, inode, 11984cb5300bSChris Mason newer_than, &newer_off, 11994cb5300bSChris Mason 64 * 1024); 12004cb5300bSChris Mason if (!ret) { 12014cb5300bSChris Mason range->start = newer_off; 12024cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 12034cb5300bSChris Mason } else { 12044cb5300bSChris Mason break; 1205940100a4SChris Mason } 12064cb5300bSChris Mason } else { 1207008873eaSLi Zefan if (ret > 0) { 1208cbcc8326SLi Zefan i += ret; 1209008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1210008873eaSLi Zefan } else { 1211940100a4SChris Mason i++; 1212008873eaSLi Zefan last_len = 0; 1213008873eaSLi Zefan } 1214f46b5a66SChristoph Hellwig } 12154cb5300bSChris Mason } 1216f46b5a66SChristoph Hellwig 12171e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 12181e701a32SChris Mason filemap_flush(inode->i_mapping); 12191e701a32SChris Mason 12201e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 12211e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 12221e701a32SChris Mason * we have to make sure the IO is actually started and that 12231e701a32SChris Mason * ordered extents get created before we return 12241e701a32SChris Mason */ 12251e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 12261e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 12271e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 12281e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 12291e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 12301e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 12311e701a32SChris Mason } 12321e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 12331e701a32SChris Mason 12341e701a32SChris Mason mutex_lock(&inode->i_mutex); 1235261507a0SLi Zefan BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 12361e701a32SChris Mason mutex_unlock(&inode->i_mutex); 12371e701a32SChris Mason } 12381e701a32SChris Mason 12396c41761fSDavid Sterba disk_super = root->fs_info->super_copy; 12401a419d85SLi Zefan features = btrfs_super_incompat_flags(disk_super); 12411a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 12421a419d85SLi Zefan features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; 12431a419d85SLi Zefan btrfs_set_super_incompat_flags(disk_super, features); 12441a419d85SLi Zefan } 12451a419d85SLi Zefan 124660ccf82fSDiego Calleja ret = defrag_count; 1247940100a4SChris Mason 12484cb5300bSChris Mason out_ra: 12494cb5300bSChris Mason if (!file) 12504cb5300bSChris Mason kfree(ra); 12514cb5300bSChris Mason kfree(pages); 1252940100a4SChris Mason return ret; 1253f46b5a66SChristoph Hellwig } 1254f46b5a66SChristoph Hellwig 125576dda93cSYan, Zheng static noinline int btrfs_ioctl_resize(struct btrfs_root *root, 125676dda93cSYan, Zheng void __user *arg) 1257f46b5a66SChristoph Hellwig { 1258f46b5a66SChristoph Hellwig u64 new_size; 1259f46b5a66SChristoph Hellwig u64 old_size; 1260f46b5a66SChristoph Hellwig u64 devid = 1; 1261f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1262f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1263f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1264f46b5a66SChristoph Hellwig char *sizestr; 1265f46b5a66SChristoph Hellwig char *devstr = NULL; 1266f46b5a66SChristoph Hellwig int ret = 0; 1267f46b5a66SChristoph Hellwig int mod = 0; 1268f46b5a66SChristoph Hellwig 1269c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1270c146afadSYan Zheng return -EROFS; 1271c146afadSYan Zheng 1272e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1273e441d54dSChris Mason return -EPERM; 1274e441d54dSChris Mason 1275c9e9f97bSIlya Dryomov mutex_lock(&root->fs_info->volume_mutex); 1276c9e9f97bSIlya Dryomov if (root->fs_info->balance_ctl) { 1277c9e9f97bSIlya Dryomov printk(KERN_INFO "btrfs: balance in progress\n"); 1278c9e9f97bSIlya Dryomov ret = -EINVAL; 1279c9e9f97bSIlya Dryomov goto out; 1280c9e9f97bSIlya Dryomov } 1281c9e9f97bSIlya Dryomov 1282dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1283c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1284c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1285c9e9f97bSIlya Dryomov goto out; 1286c9e9f97bSIlya Dryomov } 12875516e595SMark Fasheh 12885516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1289f46b5a66SChristoph Hellwig 1290f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1291f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1292f46b5a66SChristoph Hellwig if (devstr) { 1293f46b5a66SChristoph Hellwig char *end; 1294f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1295f46b5a66SChristoph Hellwig *devstr = '\0'; 1296f46b5a66SChristoph Hellwig devstr = vol_args->name; 1297f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 12985bb14682SArnd Hannemann printk(KERN_INFO "btrfs: resizing devid %llu\n", 129921380931SJoel Becker (unsigned long long)devid); 1300f46b5a66SChristoph Hellwig } 13012b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 1302f46b5a66SChristoph Hellwig if (!device) { 13035bb14682SArnd Hannemann printk(KERN_INFO "btrfs: resizer unable to find device %llu\n", 130421380931SJoel Becker (unsigned long long)devid); 1305f46b5a66SChristoph Hellwig ret = -EINVAL; 1306c9e9f97bSIlya Dryomov goto out_free; 1307f46b5a66SChristoph Hellwig } 1308f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1309f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1310f46b5a66SChristoph Hellwig else { 1311f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1312f46b5a66SChristoph Hellwig mod = -1; 1313f46b5a66SChristoph Hellwig sizestr++; 1314f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1315f46b5a66SChristoph Hellwig mod = 1; 1316f46b5a66SChristoph Hellwig sizestr++; 1317f46b5a66SChristoph Hellwig } 131891748467SAkinobu Mita new_size = memparse(sizestr, NULL); 1319f46b5a66SChristoph Hellwig if (new_size == 0) { 1320f46b5a66SChristoph Hellwig ret = -EINVAL; 1321c9e9f97bSIlya Dryomov goto out_free; 1322f46b5a66SChristoph Hellwig } 1323f46b5a66SChristoph Hellwig } 1324f46b5a66SChristoph Hellwig 1325f46b5a66SChristoph Hellwig old_size = device->total_bytes; 1326f46b5a66SChristoph Hellwig 1327f46b5a66SChristoph Hellwig if (mod < 0) { 1328f46b5a66SChristoph Hellwig if (new_size > old_size) { 1329f46b5a66SChristoph Hellwig ret = -EINVAL; 1330c9e9f97bSIlya Dryomov goto out_free; 1331f46b5a66SChristoph Hellwig } 1332f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1333f46b5a66SChristoph Hellwig } else if (mod > 0) { 1334f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1335f46b5a66SChristoph Hellwig } 1336f46b5a66SChristoph Hellwig 1337f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 1338f46b5a66SChristoph Hellwig ret = -EINVAL; 1339c9e9f97bSIlya Dryomov goto out_free; 1340f46b5a66SChristoph Hellwig } 1341f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1342f46b5a66SChristoph Hellwig ret = -EFBIG; 1343c9e9f97bSIlya Dryomov goto out_free; 1344f46b5a66SChristoph Hellwig } 1345f46b5a66SChristoph Hellwig 1346f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 1347f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1348f46b5a66SChristoph Hellwig 1349606686eeSJosef Bacik printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n", 1350606686eeSJosef Bacik rcu_str_deref(device->name), 1351606686eeSJosef Bacik (unsigned long long)new_size); 1352f46b5a66SChristoph Hellwig 1353f46b5a66SChristoph Hellwig if (new_size > old_size) { 1354a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 135598d5dc13STsutomu Itoh if (IS_ERR(trans)) { 135698d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1357c9e9f97bSIlya Dryomov goto out_free; 135898d5dc13STsutomu Itoh } 1359f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1360f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1361ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1362f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 1363f46b5a66SChristoph Hellwig } 1364f46b5a66SChristoph Hellwig 1365c9e9f97bSIlya Dryomov out_free: 1366f46b5a66SChristoph Hellwig kfree(vol_args); 1367c9e9f97bSIlya Dryomov out: 1368c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 1369f46b5a66SChristoph Hellwig return ret; 1370f46b5a66SChristoph Hellwig } 1371f46b5a66SChristoph Hellwig 137272fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 137372fd032eSSage Weil char *name, 137472fd032eSSage Weil unsigned long fd, 137572fd032eSSage Weil int subvol, 1376b83cc969SLi Zefan u64 *transid, 1377b83cc969SLi Zefan bool readonly) 1378f46b5a66SChristoph Hellwig { 1379cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 13803de4586cSChris Mason struct file *src_file; 1381f46b5a66SChristoph Hellwig int namelen; 13823de4586cSChris Mason int ret = 0; 1383f46b5a66SChristoph Hellwig 1384c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1385c146afadSYan Zheng return -EROFS; 1386c146afadSYan Zheng 138772fd032eSSage Weil namelen = strlen(name); 138872fd032eSSage Weil if (strchr(name, '/')) { 1389f46b5a66SChristoph Hellwig ret = -EINVAL; 1390f46b5a66SChristoph Hellwig goto out; 1391f46b5a66SChristoph Hellwig } 1392f46b5a66SChristoph Hellwig 139316780cabSChris Mason if (name[0] == '.' && 139416780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 139516780cabSChris Mason ret = -EEXIST; 139616780cabSChris Mason goto out; 139716780cabSChris Mason } 139816780cabSChris Mason 13993de4586cSChris Mason if (subvol) { 140072fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 1401b83cc969SLi Zefan NULL, transid, readonly); 1402cb8e7090SChristoph Hellwig } else { 14033de4586cSChris Mason struct inode *src_inode; 140472fd032eSSage Weil src_file = fget(fd); 14053de4586cSChris Mason if (!src_file) { 14063de4586cSChris Mason ret = -EINVAL; 14073de4586cSChris Mason goto out; 14083de4586cSChris Mason } 14093de4586cSChris Mason 14103de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 14113de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 1412d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 1413d397712bSChris Mason "another FS\n"); 14143de4586cSChris Mason ret = -EINVAL; 14153de4586cSChris Mason fput(src_file); 14163de4586cSChris Mason goto out; 14173de4586cSChris Mason } 141872fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 141972fd032eSSage Weil BTRFS_I(src_inode)->root, 1420b83cc969SLi Zefan transid, readonly); 14213de4586cSChris Mason fput(src_file); 1422cb8e7090SChristoph Hellwig } 1423f46b5a66SChristoph Hellwig out: 142472fd032eSSage Weil return ret; 142572fd032eSSage Weil } 142672fd032eSSage Weil 142772fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1428fa0d2b9bSLi Zefan void __user *arg, int subvol) 142972fd032eSSage Weil { 1430fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 143172fd032eSSage Weil int ret; 143272fd032eSSage Weil 1433fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1434fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1435fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1436fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1437fa0d2b9bSLi Zefan 1438fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1439b83cc969SLi Zefan vol_args->fd, subvol, 1440b83cc969SLi Zefan NULL, false); 1441fa0d2b9bSLi Zefan 1442fa0d2b9bSLi Zefan kfree(vol_args); 1443fa0d2b9bSLi Zefan return ret; 1444fa0d2b9bSLi Zefan } 1445fa0d2b9bSLi Zefan 1446fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1447fa0d2b9bSLi Zefan void __user *arg, int subvol) 1448fa0d2b9bSLi Zefan { 1449fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1450fa0d2b9bSLi Zefan int ret; 1451fdfb1e4fSLi Zefan u64 transid = 0; 1452fdfb1e4fSLi Zefan u64 *ptr = NULL; 1453b83cc969SLi Zefan bool readonly = false; 145472fd032eSSage Weil 1455fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1456fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1457fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1458fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1459fdfb1e4fSLi Zefan 1460b83cc969SLi Zefan if (vol_args->flags & 1461b83cc969SLi Zefan ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY)) { 1462b83cc969SLi Zefan ret = -EOPNOTSUPP; 1463fdfb1e4fSLi Zefan goto out; 1464fdfb1e4fSLi Zefan } 1465fdfb1e4fSLi Zefan 1466fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1467fdfb1e4fSLi Zefan ptr = &transid; 1468b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1469b83cc969SLi Zefan readonly = true; 147075eaa0e2SSage Weil 1471fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1472b83cc969SLi Zefan vol_args->fd, subvol, 1473b83cc969SLi Zefan ptr, readonly); 147475eaa0e2SSage Weil 1475fdfb1e4fSLi Zefan if (ret == 0 && ptr && 147675eaa0e2SSage Weil copy_to_user(arg + 1477fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1478fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 147975eaa0e2SSage Weil ret = -EFAULT; 1480fdfb1e4fSLi Zefan out: 1481f46b5a66SChristoph Hellwig kfree(vol_args); 1482f46b5a66SChristoph Hellwig return ret; 1483f46b5a66SChristoph Hellwig } 1484f46b5a66SChristoph Hellwig 14850caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 14860caa102dSLi Zefan void __user *arg) 14870caa102dSLi Zefan { 14880caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 14890caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 14900caa102dSLi Zefan int ret = 0; 14910caa102dSLi Zefan u64 flags = 0; 14920caa102dSLi Zefan 149333345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 14940caa102dSLi Zefan return -EINVAL; 14950caa102dSLi Zefan 14960caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 14970caa102dSLi Zefan if (btrfs_root_readonly(root)) 14980caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 14990caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 15000caa102dSLi Zefan 15010caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 15020caa102dSLi Zefan ret = -EFAULT; 15030caa102dSLi Zefan 15040caa102dSLi Zefan return ret; 15050caa102dSLi Zefan } 15060caa102dSLi Zefan 15070caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 15080caa102dSLi Zefan void __user *arg) 15090caa102dSLi Zefan { 15100caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 15110caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 15120caa102dSLi Zefan struct btrfs_trans_handle *trans; 15130caa102dSLi Zefan u64 root_flags; 15140caa102dSLi Zefan u64 flags; 15150caa102dSLi Zefan int ret = 0; 15160caa102dSLi Zefan 15170caa102dSLi Zefan if (root->fs_info->sb->s_flags & MS_RDONLY) 15180caa102dSLi Zefan return -EROFS; 15190caa102dSLi Zefan 152033345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 15210caa102dSLi Zefan return -EINVAL; 15220caa102dSLi Zefan 15230caa102dSLi Zefan if (copy_from_user(&flags, arg, sizeof(flags))) 15240caa102dSLi Zefan return -EFAULT; 15250caa102dSLi Zefan 1526b4dc2b8cSLi Zefan if (flags & BTRFS_SUBVOL_CREATE_ASYNC) 15270caa102dSLi Zefan return -EINVAL; 15280caa102dSLi Zefan 15290caa102dSLi Zefan if (flags & ~BTRFS_SUBVOL_RDONLY) 15300caa102dSLi Zefan return -EOPNOTSUPP; 15310caa102dSLi Zefan 15322e149670SSerge E. Hallyn if (!inode_owner_or_capable(inode)) 1533b4dc2b8cSLi Zefan return -EACCES; 1534b4dc2b8cSLi Zefan 15350caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 15360caa102dSLi Zefan 15370caa102dSLi Zefan /* nothing to do */ 15380caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 15390caa102dSLi Zefan goto out; 15400caa102dSLi Zefan 15410caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 15420caa102dSLi Zefan if (flags & BTRFS_SUBVOL_RDONLY) 15430caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 15440caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 15450caa102dSLi Zefan else 15460caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 15470caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 15480caa102dSLi Zefan 15490caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 15500caa102dSLi Zefan if (IS_ERR(trans)) { 15510caa102dSLi Zefan ret = PTR_ERR(trans); 15520caa102dSLi Zefan goto out_reset; 15530caa102dSLi Zefan } 15540caa102dSLi Zefan 1555b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 15560caa102dSLi Zefan &root->root_key, &root->root_item); 15570caa102dSLi Zefan 15580caa102dSLi Zefan btrfs_commit_transaction(trans, root); 15590caa102dSLi Zefan out_reset: 15600caa102dSLi Zefan if (ret) 15610caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 15620caa102dSLi Zefan out: 15630caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 15640caa102dSLi Zefan return ret; 15650caa102dSLi Zefan } 15660caa102dSLi Zefan 156776dda93cSYan, Zheng /* 156876dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 156976dda93cSYan, Zheng */ 157076dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 157176dda93cSYan, Zheng { 157276dda93cSYan, Zheng struct btrfs_path *path; 157376dda93cSYan, Zheng struct btrfs_key key; 157476dda93cSYan, Zheng int ret; 157576dda93cSYan, Zheng 157676dda93cSYan, Zheng path = btrfs_alloc_path(); 157776dda93cSYan, Zheng if (!path) 157876dda93cSYan, Zheng return -ENOMEM; 157976dda93cSYan, Zheng 158076dda93cSYan, Zheng key.objectid = root->root_key.objectid; 158176dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 158276dda93cSYan, Zheng key.offset = (u64)-1; 158376dda93cSYan, Zheng 158476dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 158576dda93cSYan, Zheng &key, path, 0, 0); 158676dda93cSYan, Zheng if (ret < 0) 158776dda93cSYan, Zheng goto out; 158876dda93cSYan, Zheng BUG_ON(ret == 0); 158976dda93cSYan, Zheng 159076dda93cSYan, Zheng ret = 0; 159176dda93cSYan, Zheng if (path->slots[0] > 0) { 159276dda93cSYan, Zheng path->slots[0]--; 159376dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 159476dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 159576dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 159676dda93cSYan, Zheng ret = -ENOTEMPTY; 159776dda93cSYan, Zheng } 159876dda93cSYan, Zheng out: 159976dda93cSYan, Zheng btrfs_free_path(path); 160076dda93cSYan, Zheng return ret; 160176dda93cSYan, Zheng } 160276dda93cSYan, Zheng 1603ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1604ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1605ac8e9819SChris Mason { 1606abc6e134SChris Mason struct btrfs_key test; 1607abc6e134SChris Mason int ret; 1608abc6e134SChris Mason 1609abc6e134SChris Mason test.objectid = sk->min_objectid; 1610abc6e134SChris Mason test.type = sk->min_type; 1611abc6e134SChris Mason test.offset = sk->min_offset; 1612abc6e134SChris Mason 1613abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1614abc6e134SChris Mason if (ret < 0) 1615ac8e9819SChris Mason return 0; 1616abc6e134SChris Mason 1617abc6e134SChris Mason test.objectid = sk->max_objectid; 1618abc6e134SChris Mason test.type = sk->max_type; 1619abc6e134SChris Mason test.offset = sk->max_offset; 1620abc6e134SChris Mason 1621abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1622abc6e134SChris Mason if (ret > 0) 1623ac8e9819SChris Mason return 0; 1624ac8e9819SChris Mason return 1; 1625ac8e9819SChris Mason } 1626ac8e9819SChris Mason 1627ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1628ac8e9819SChris Mason struct btrfs_path *path, 1629ac8e9819SChris Mason struct btrfs_key *key, 1630ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1631ac8e9819SChris Mason char *buf, 1632ac8e9819SChris Mason unsigned long *sk_offset, 1633ac8e9819SChris Mason int *num_found) 1634ac8e9819SChris Mason { 1635ac8e9819SChris Mason u64 found_transid; 1636ac8e9819SChris Mason struct extent_buffer *leaf; 1637ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1638ac8e9819SChris Mason unsigned long item_off; 1639ac8e9819SChris Mason unsigned long item_len; 1640ac8e9819SChris Mason int nritems; 1641ac8e9819SChris Mason int i; 1642ac8e9819SChris Mason int slot; 1643ac8e9819SChris Mason int ret = 0; 1644ac8e9819SChris Mason 1645ac8e9819SChris Mason leaf = path->nodes[0]; 1646ac8e9819SChris Mason slot = path->slots[0]; 1647ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1648ac8e9819SChris Mason 1649ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1650ac8e9819SChris Mason i = nritems; 1651ac8e9819SChris Mason goto advance_key; 1652ac8e9819SChris Mason } 1653ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1654ac8e9819SChris Mason 1655ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1656ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1657ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1658ac8e9819SChris Mason 1659ac8e9819SChris Mason if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1660ac8e9819SChris Mason item_len = 0; 1661ac8e9819SChris Mason 1662ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1663ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1664ac8e9819SChris Mason ret = 1; 1665ac8e9819SChris Mason goto overflow; 1666ac8e9819SChris Mason } 1667ac8e9819SChris Mason 1668ac8e9819SChris Mason btrfs_item_key_to_cpu(leaf, key, i); 1669ac8e9819SChris Mason if (!key_in_sk(key, sk)) 1670ac8e9819SChris Mason continue; 1671ac8e9819SChris Mason 1672ac8e9819SChris Mason sh.objectid = key->objectid; 1673ac8e9819SChris Mason sh.offset = key->offset; 1674ac8e9819SChris Mason sh.type = key->type; 1675ac8e9819SChris Mason sh.len = item_len; 1676ac8e9819SChris Mason sh.transid = found_transid; 1677ac8e9819SChris Mason 1678ac8e9819SChris Mason /* copy search result header */ 1679ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1680ac8e9819SChris Mason *sk_offset += sizeof(sh); 1681ac8e9819SChris Mason 1682ac8e9819SChris Mason if (item_len) { 1683ac8e9819SChris Mason char *p = buf + *sk_offset; 1684ac8e9819SChris Mason /* copy the item */ 1685ac8e9819SChris Mason read_extent_buffer(leaf, p, 1686ac8e9819SChris Mason item_off, item_len); 1687ac8e9819SChris Mason *sk_offset += item_len; 1688ac8e9819SChris Mason } 1689e2156867SHugo Mills (*num_found)++; 1690ac8e9819SChris Mason 1691ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1692ac8e9819SChris Mason break; 1693ac8e9819SChris Mason } 1694ac8e9819SChris Mason advance_key: 1695ac8e9819SChris Mason ret = 0; 1696abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1697abc6e134SChris Mason key->offset++; 1698abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1699abc6e134SChris Mason key->offset = 0; 1700abc6e134SChris Mason key->type++; 1701abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1702abc6e134SChris Mason key->offset = 0; 1703abc6e134SChris Mason key->type = 0; 1704abc6e134SChris Mason key->objectid++; 1705abc6e134SChris Mason } else 1706abc6e134SChris Mason ret = 1; 1707ac8e9819SChris Mason overflow: 1708ac8e9819SChris Mason return ret; 1709ac8e9819SChris Mason } 1710ac8e9819SChris Mason 1711ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1712ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1713ac8e9819SChris Mason { 1714ac8e9819SChris Mason struct btrfs_root *root; 1715ac8e9819SChris Mason struct btrfs_key key; 1716ac8e9819SChris Mason struct btrfs_key max_key; 1717ac8e9819SChris Mason struct btrfs_path *path; 1718ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1719ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1720ac8e9819SChris Mason int ret; 1721ac8e9819SChris Mason int num_found = 0; 1722ac8e9819SChris Mason unsigned long sk_offset = 0; 1723ac8e9819SChris Mason 1724ac8e9819SChris Mason path = btrfs_alloc_path(); 1725ac8e9819SChris Mason if (!path) 1726ac8e9819SChris Mason return -ENOMEM; 1727ac8e9819SChris Mason 1728ac8e9819SChris Mason if (sk->tree_id == 0) { 1729ac8e9819SChris Mason /* search the root of the inode that was passed */ 1730ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1731ac8e9819SChris Mason } else { 1732ac8e9819SChris Mason key.objectid = sk->tree_id; 1733ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1734ac8e9819SChris Mason key.offset = (u64)-1; 1735ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1736ac8e9819SChris Mason if (IS_ERR(root)) { 1737ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1738ac8e9819SChris Mason sk->tree_id); 1739ac8e9819SChris Mason btrfs_free_path(path); 1740ac8e9819SChris Mason return -ENOENT; 1741ac8e9819SChris Mason } 1742ac8e9819SChris Mason } 1743ac8e9819SChris Mason 1744ac8e9819SChris Mason key.objectid = sk->min_objectid; 1745ac8e9819SChris Mason key.type = sk->min_type; 1746ac8e9819SChris Mason key.offset = sk->min_offset; 1747ac8e9819SChris Mason 1748ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1749ac8e9819SChris Mason max_key.type = sk->max_type; 1750ac8e9819SChris Mason max_key.offset = sk->max_offset; 1751ac8e9819SChris Mason 1752ac8e9819SChris Mason path->keep_locks = 1; 1753ac8e9819SChris Mason 1754ac8e9819SChris Mason while(1) { 1755ac8e9819SChris Mason ret = btrfs_search_forward(root, &key, &max_key, path, 0, 1756ac8e9819SChris Mason sk->min_transid); 1757ac8e9819SChris Mason if (ret != 0) { 1758ac8e9819SChris Mason if (ret > 0) 1759ac8e9819SChris Mason ret = 0; 1760ac8e9819SChris Mason goto err; 1761ac8e9819SChris Mason } 1762ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1763ac8e9819SChris Mason &sk_offset, &num_found); 1764b3b4aa74SDavid Sterba btrfs_release_path(path); 1765ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1766ac8e9819SChris Mason break; 1767ac8e9819SChris Mason 1768ac8e9819SChris Mason } 1769ac8e9819SChris Mason ret = 0; 1770ac8e9819SChris Mason err: 1771ac8e9819SChris Mason sk->nr_items = num_found; 1772ac8e9819SChris Mason btrfs_free_path(path); 1773ac8e9819SChris Mason return ret; 1774ac8e9819SChris Mason } 1775ac8e9819SChris Mason 1776ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1777ac8e9819SChris Mason void __user *argp) 1778ac8e9819SChris Mason { 1779ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1780ac8e9819SChris Mason struct inode *inode; 1781ac8e9819SChris Mason int ret; 1782ac8e9819SChris Mason 1783ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1784ac8e9819SChris Mason return -EPERM; 1785ac8e9819SChris Mason 17862354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 17872354d08fSJulia Lawall if (IS_ERR(args)) 17882354d08fSJulia Lawall return PTR_ERR(args); 1789ac8e9819SChris Mason 1790ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1791ac8e9819SChris Mason ret = search_ioctl(inode, args); 1792ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1793ac8e9819SChris Mason ret = -EFAULT; 1794ac8e9819SChris Mason kfree(args); 1795ac8e9819SChris Mason return ret; 1796ac8e9819SChris Mason } 1797ac8e9819SChris Mason 179898d377a0STARUISI Hiroaki /* 1799ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1800ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 180198d377a0STARUISI Hiroaki */ 180298d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 180398d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 180498d377a0STARUISI Hiroaki { 180598d377a0STARUISI Hiroaki struct btrfs_root *root; 180698d377a0STARUISI Hiroaki struct btrfs_key key; 1807ac8e9819SChris Mason char *ptr; 180898d377a0STARUISI Hiroaki int ret = -1; 180998d377a0STARUISI Hiroaki int slot; 181098d377a0STARUISI Hiroaki int len; 181198d377a0STARUISI Hiroaki int total_len = 0; 181298d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 181398d377a0STARUISI Hiroaki struct extent_buffer *l; 181498d377a0STARUISI Hiroaki struct btrfs_path *path; 181598d377a0STARUISI Hiroaki 181698d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 181798d377a0STARUISI Hiroaki name[0]='\0'; 181898d377a0STARUISI Hiroaki return 0; 181998d377a0STARUISI Hiroaki } 182098d377a0STARUISI Hiroaki 182198d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 182298d377a0STARUISI Hiroaki if (!path) 182398d377a0STARUISI Hiroaki return -ENOMEM; 182498d377a0STARUISI Hiroaki 1825ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 182698d377a0STARUISI Hiroaki 182798d377a0STARUISI Hiroaki key.objectid = tree_id; 182898d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 182998d377a0STARUISI Hiroaki key.offset = (u64)-1; 183098d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 183198d377a0STARUISI Hiroaki if (IS_ERR(root)) { 183298d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 18338ad6fcabSChris Mason ret = -ENOENT; 18348ad6fcabSChris Mason goto out; 183598d377a0STARUISI Hiroaki } 183698d377a0STARUISI Hiroaki 183798d377a0STARUISI Hiroaki key.objectid = dirid; 183898d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 18398ad6fcabSChris Mason key.offset = (u64)-1; 184098d377a0STARUISI Hiroaki 184198d377a0STARUISI Hiroaki while(1) { 184298d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 184398d377a0STARUISI Hiroaki if (ret < 0) 184498d377a0STARUISI Hiroaki goto out; 184598d377a0STARUISI Hiroaki 184698d377a0STARUISI Hiroaki l = path->nodes[0]; 184798d377a0STARUISI Hiroaki slot = path->slots[0]; 18488ad6fcabSChris Mason if (ret > 0 && slot > 0) 18498ad6fcabSChris Mason slot--; 185098d377a0STARUISI Hiroaki btrfs_item_key_to_cpu(l, &key, slot); 185198d377a0STARUISI Hiroaki 185298d377a0STARUISI Hiroaki if (ret > 0 && (key.objectid != dirid || 1853ac8e9819SChris Mason key.type != BTRFS_INODE_REF_KEY)) { 1854ac8e9819SChris Mason ret = -ENOENT; 185598d377a0STARUISI Hiroaki goto out; 1856ac8e9819SChris Mason } 185798d377a0STARUISI Hiroaki 185898d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 185998d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 186098d377a0STARUISI Hiroaki ptr -= len + 1; 186198d377a0STARUISI Hiroaki total_len += len + 1; 1862ac8e9819SChris Mason if (ptr < name) 186398d377a0STARUISI Hiroaki goto out; 186498d377a0STARUISI Hiroaki 186598d377a0STARUISI Hiroaki *(ptr + len) = '/'; 186698d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 186798d377a0STARUISI Hiroaki 186898d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 186998d377a0STARUISI Hiroaki break; 187098d377a0STARUISI Hiroaki 1871b3b4aa74SDavid Sterba btrfs_release_path(path); 187298d377a0STARUISI Hiroaki key.objectid = key.offset; 18738ad6fcabSChris Mason key.offset = (u64)-1; 187498d377a0STARUISI Hiroaki dirid = key.objectid; 187598d377a0STARUISI Hiroaki } 1876ac8e9819SChris Mason if (ptr < name) 187798d377a0STARUISI Hiroaki goto out; 187877906a50SLi Zefan memmove(name, ptr, total_len); 187998d377a0STARUISI Hiroaki name[total_len]='\0'; 188098d377a0STARUISI Hiroaki ret = 0; 188198d377a0STARUISI Hiroaki out: 188298d377a0STARUISI Hiroaki btrfs_free_path(path); 1883ac8e9819SChris Mason return ret; 1884ac8e9819SChris Mason } 1885ac8e9819SChris Mason 1886ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 1887ac8e9819SChris Mason void __user *argp) 1888ac8e9819SChris Mason { 1889ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 1890ac8e9819SChris Mason struct inode *inode; 1891ac8e9819SChris Mason int ret; 1892ac8e9819SChris Mason 1893ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1894ac8e9819SChris Mason return -EPERM; 1895ac8e9819SChris Mason 18962354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 18972354d08fSJulia Lawall if (IS_ERR(args)) 18982354d08fSJulia Lawall return PTR_ERR(args); 1899c2b96929SDan Carpenter 1900ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1901ac8e9819SChris Mason 19021b53ac4dSChris Mason if (args->treeid == 0) 19031b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 19041b53ac4dSChris Mason 1905ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 1906ac8e9819SChris Mason args->treeid, args->objectid, 1907ac8e9819SChris Mason args->name); 1908ac8e9819SChris Mason 1909ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1910ac8e9819SChris Mason ret = -EFAULT; 1911ac8e9819SChris Mason 1912ac8e9819SChris Mason kfree(args); 191398d377a0STARUISI Hiroaki return ret; 191498d377a0STARUISI Hiroaki } 191598d377a0STARUISI Hiroaki 191676dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 191776dda93cSYan, Zheng void __user *arg) 191876dda93cSYan, Zheng { 191976dda93cSYan, Zheng struct dentry *parent = fdentry(file); 192076dda93cSYan, Zheng struct dentry *dentry; 192176dda93cSYan, Zheng struct inode *dir = parent->d_inode; 192276dda93cSYan, Zheng struct inode *inode; 192376dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 192476dda93cSYan, Zheng struct btrfs_root *dest = NULL; 192576dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 192676dda93cSYan, Zheng struct btrfs_trans_handle *trans; 192776dda93cSYan, Zheng int namelen; 192876dda93cSYan, Zheng int ret; 192976dda93cSYan, Zheng int err = 0; 193076dda93cSYan, Zheng 193176dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 193276dda93cSYan, Zheng if (IS_ERR(vol_args)) 193376dda93cSYan, Zheng return PTR_ERR(vol_args); 193476dda93cSYan, Zheng 193576dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 193676dda93cSYan, Zheng namelen = strlen(vol_args->name); 193776dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 193876dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 193976dda93cSYan, Zheng err = -EINVAL; 194076dda93cSYan, Zheng goto out; 194176dda93cSYan, Zheng } 194276dda93cSYan, Zheng 1943a561be71SAl Viro err = mnt_want_write_file(file); 194476dda93cSYan, Zheng if (err) 194576dda93cSYan, Zheng goto out; 194676dda93cSYan, Zheng 194776dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 194876dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 194976dda93cSYan, Zheng if (IS_ERR(dentry)) { 195076dda93cSYan, Zheng err = PTR_ERR(dentry); 195176dda93cSYan, Zheng goto out_unlock_dir; 195276dda93cSYan, Zheng } 195376dda93cSYan, Zheng 195476dda93cSYan, Zheng if (!dentry->d_inode) { 195576dda93cSYan, Zheng err = -ENOENT; 195676dda93cSYan, Zheng goto out_dput; 195776dda93cSYan, Zheng } 195876dda93cSYan, Zheng 195976dda93cSYan, Zheng inode = dentry->d_inode; 19604260f7c7SSage Weil dest = BTRFS_I(inode)->root; 19614260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)){ 19624260f7c7SSage Weil /* 19634260f7c7SSage Weil * Regular user. Only allow this with a special mount 19644260f7c7SSage Weil * option, when the user has write+exec access to the 19654260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 19664260f7c7SSage Weil * allowed. 19674260f7c7SSage Weil * 19684260f7c7SSage Weil * Note that this is _not_ check that the subvol is 19694260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 19704260f7c7SSage Weil * otherwise be able to delete. 19714260f7c7SSage Weil * 19724260f7c7SSage Weil * Users who want to delete empty subvols should try 19734260f7c7SSage Weil * rmdir(2). 19744260f7c7SSage Weil */ 19754260f7c7SSage Weil err = -EPERM; 19764260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 19774260f7c7SSage Weil goto out_dput; 19784260f7c7SSage Weil 19794260f7c7SSage Weil /* 19804260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 19814260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 19824260f7c7SSage Weil * must be called on the dentry referencing the root 19834260f7c7SSage Weil * of the subvol, not a random directory contained 19844260f7c7SSage Weil * within it. 19854260f7c7SSage Weil */ 19864260f7c7SSage Weil err = -EINVAL; 19874260f7c7SSage Weil if (root == dest) 19884260f7c7SSage Weil goto out_dput; 19894260f7c7SSage Weil 19904260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 19914260f7c7SSage Weil if (err) 19924260f7c7SSage Weil goto out_dput; 19934260f7c7SSage Weil 19944260f7c7SSage Weil /* check if subvolume may be deleted by a non-root user */ 19954260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 19964260f7c7SSage Weil if (err) 19974260f7c7SSage Weil goto out_dput; 19984260f7c7SSage Weil } 19994260f7c7SSage Weil 200033345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 200176dda93cSYan, Zheng err = -EINVAL; 200276dda93cSYan, Zheng goto out_dput; 200376dda93cSYan, Zheng } 200476dda93cSYan, Zheng 200576dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 200676dda93cSYan, Zheng err = d_invalidate(dentry); 200776dda93cSYan, Zheng if (err) 200876dda93cSYan, Zheng goto out_unlock; 200976dda93cSYan, Zheng 201076dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 201176dda93cSYan, Zheng 201276dda93cSYan, Zheng err = may_destroy_subvol(dest); 201376dda93cSYan, Zheng if (err) 201476dda93cSYan, Zheng goto out_up_write; 201576dda93cSYan, Zheng 2016a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2017a22285a6SYan, Zheng if (IS_ERR(trans)) { 2018a22285a6SYan, Zheng err = PTR_ERR(trans); 2019d327099aSDan Carpenter goto out_up_write; 2020a22285a6SYan, Zheng } 2021a22285a6SYan, Zheng trans->block_rsv = &root->fs_info->global_block_rsv; 2022a22285a6SYan, Zheng 202376dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 202476dda93cSYan, Zheng dest->root_key.objectid, 202576dda93cSYan, Zheng dentry->d_name.name, 202676dda93cSYan, Zheng dentry->d_name.len); 202779787eaaSJeff Mahoney if (ret) { 202879787eaaSJeff Mahoney err = ret; 202979787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 203079787eaaSJeff Mahoney goto out_end_trans; 203179787eaaSJeff Mahoney } 203276dda93cSYan, Zheng 203376dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 203476dda93cSYan, Zheng 203576dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 203676dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 203776dda93cSYan, Zheng dest->root_item.drop_level = 0; 203876dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 203976dda93cSYan, Zheng 2040d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 204176dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 204276dda93cSYan, Zheng root->fs_info->tree_root, 204376dda93cSYan, Zheng dest->root_key.objectid); 204479787eaaSJeff Mahoney if (ret) { 204579787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 204679787eaaSJeff Mahoney err = ret; 204779787eaaSJeff Mahoney goto out_end_trans; 2048d68fc57bSYan, Zheng } 204979787eaaSJeff Mahoney } 205079787eaaSJeff Mahoney out_end_trans: 2051531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 205279787eaaSJeff Mahoney if (ret && !err) 205379787eaaSJeff Mahoney err = ret; 205476dda93cSYan, Zheng inode->i_flags |= S_DEAD; 205576dda93cSYan, Zheng out_up_write: 205676dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 205776dda93cSYan, Zheng out_unlock: 205876dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 205976dda93cSYan, Zheng if (!err) { 2060efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 206176dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 206276dda93cSYan, Zheng d_delete(dentry); 206376dda93cSYan, Zheng } 206476dda93cSYan, Zheng out_dput: 206576dda93cSYan, Zheng dput(dentry); 206676dda93cSYan, Zheng out_unlock_dir: 206776dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 20682a79f17eSAl Viro mnt_drop_write_file(file); 206976dda93cSYan, Zheng out: 207076dda93cSYan, Zheng kfree(vol_args); 207176dda93cSYan, Zheng return err; 207276dda93cSYan, Zheng } 207376dda93cSYan, Zheng 20741e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2075f46b5a66SChristoph Hellwig { 2076f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2077f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 20781e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2079c146afadSYan Zheng int ret; 2080c146afadSYan Zheng 2081b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2082b83cc969SLi Zefan return -EROFS; 2083b83cc969SLi Zefan 2084a561be71SAl Viro ret = mnt_want_write_file(file); 2085c146afadSYan Zheng if (ret) 2086c146afadSYan Zheng return ret; 2087f46b5a66SChristoph Hellwig 2088f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2089f46b5a66SChristoph Hellwig case S_IFDIR: 2090e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2091e441d54dSChris Mason ret = -EPERM; 2092e441d54dSChris Mason goto out; 2093e441d54dSChris Mason } 20948929ecfaSYan, Zheng ret = btrfs_defrag_root(root, 0); 20958929ecfaSYan, Zheng if (ret) 20968929ecfaSYan, Zheng goto out; 20978929ecfaSYan, Zheng ret = btrfs_defrag_root(root->fs_info->extent_root, 0); 2098f46b5a66SChristoph Hellwig break; 2099f46b5a66SChristoph Hellwig case S_IFREG: 2100e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2101e441d54dSChris Mason ret = -EINVAL; 2102e441d54dSChris Mason goto out; 2103e441d54dSChris Mason } 21041e701a32SChris Mason 21051e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 21061e701a32SChris Mason if (!range) { 21071e701a32SChris Mason ret = -ENOMEM; 21081e701a32SChris Mason goto out; 21091e701a32SChris Mason } 21101e701a32SChris Mason 21111e701a32SChris Mason if (argp) { 21121e701a32SChris Mason if (copy_from_user(range, argp, 21131e701a32SChris Mason sizeof(*range))) { 21141e701a32SChris Mason ret = -EFAULT; 21151e701a32SChris Mason kfree(range); 2116683be16eSDan Carpenter goto out; 21171e701a32SChris Mason } 21181e701a32SChris Mason /* compression requires us to start the IO */ 21191e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 21201e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 21211e701a32SChris Mason range->extent_thresh = (u32)-1; 21221e701a32SChris Mason } 21231e701a32SChris Mason } else { 21241e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 21251e701a32SChris Mason range->len = (u64)-1; 21261e701a32SChris Mason } 21274cb5300bSChris Mason ret = btrfs_defrag_file(fdentry(file)->d_inode, file, 21284cb5300bSChris Mason range, 0, 0); 21294cb5300bSChris Mason if (ret > 0) 21304cb5300bSChris Mason ret = 0; 21311e701a32SChris Mason kfree(range); 2132f46b5a66SChristoph Hellwig break; 21338929ecfaSYan, Zheng default: 21348929ecfaSYan, Zheng ret = -EINVAL; 2135f46b5a66SChristoph Hellwig } 2136e441d54dSChris Mason out: 21372a79f17eSAl Viro mnt_drop_write_file(file); 2138e441d54dSChris Mason return ret; 2139f46b5a66SChristoph Hellwig } 2140f46b5a66SChristoph Hellwig 2141b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2142f46b5a66SChristoph Hellwig { 2143f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2144f46b5a66SChristoph Hellwig int ret; 2145f46b5a66SChristoph Hellwig 2146e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2147e441d54dSChris Mason return -EPERM; 2148e441d54dSChris Mason 2149c9e9f97bSIlya Dryomov mutex_lock(&root->fs_info->volume_mutex); 2150c9e9f97bSIlya Dryomov if (root->fs_info->balance_ctl) { 2151c9e9f97bSIlya Dryomov printk(KERN_INFO "btrfs: balance in progress\n"); 2152c9e9f97bSIlya Dryomov ret = -EINVAL; 2153c9e9f97bSIlya Dryomov goto out; 2154c9e9f97bSIlya Dryomov } 2155c9e9f97bSIlya Dryomov 2156dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2157c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2158c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2159c9e9f97bSIlya Dryomov goto out; 2160c9e9f97bSIlya Dryomov } 2161f46b5a66SChristoph Hellwig 21625516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2163f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2164f46b5a66SChristoph Hellwig 2165f46b5a66SChristoph Hellwig kfree(vol_args); 2166c9e9f97bSIlya Dryomov out: 2167c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 2168f46b5a66SChristoph Hellwig return ret; 2169f46b5a66SChristoph Hellwig } 2170f46b5a66SChristoph Hellwig 2171b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 2172f46b5a66SChristoph Hellwig { 2173f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2174f46b5a66SChristoph Hellwig int ret; 2175f46b5a66SChristoph Hellwig 2176e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2177e441d54dSChris Mason return -EPERM; 2178e441d54dSChris Mason 2179c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 2180c146afadSYan Zheng return -EROFS; 2181c146afadSYan Zheng 2182c9e9f97bSIlya Dryomov mutex_lock(&root->fs_info->volume_mutex); 2183c9e9f97bSIlya Dryomov if (root->fs_info->balance_ctl) { 2184c9e9f97bSIlya Dryomov printk(KERN_INFO "btrfs: balance in progress\n"); 2185c9e9f97bSIlya Dryomov ret = -EINVAL; 2186c9e9f97bSIlya Dryomov goto out; 2187c9e9f97bSIlya Dryomov } 2188c9e9f97bSIlya Dryomov 2189dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2190c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2191c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2192c9e9f97bSIlya Dryomov goto out; 2193c9e9f97bSIlya Dryomov } 2194f46b5a66SChristoph Hellwig 21955516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2196f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 2197f46b5a66SChristoph Hellwig 2198f46b5a66SChristoph Hellwig kfree(vol_args); 2199c9e9f97bSIlya Dryomov out: 2200c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 2201f46b5a66SChristoph Hellwig return ret; 2202f46b5a66SChristoph Hellwig } 2203f46b5a66SChristoph Hellwig 2204475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2205475f6387SJan Schmidt { 2206027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2207475f6387SJan Schmidt struct btrfs_device *device; 2208475f6387SJan Schmidt struct btrfs_device *next; 2209475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2210027ed2f0SLi Zefan int ret = 0; 2211475f6387SJan Schmidt 2212475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2213475f6387SJan Schmidt return -EPERM; 2214475f6387SJan Schmidt 2215027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2216027ed2f0SLi Zefan if (!fi_args) 2217027ed2f0SLi Zefan return -ENOMEM; 2218027ed2f0SLi Zefan 2219027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2220027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2221475f6387SJan Schmidt 2222475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2223475f6387SJan Schmidt list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { 2224027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2225027ed2f0SLi Zefan fi_args->max_id = device->devid; 2226475f6387SJan Schmidt } 2227475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2228475f6387SJan Schmidt 2229027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2230027ed2f0SLi Zefan ret = -EFAULT; 2231475f6387SJan Schmidt 2232027ed2f0SLi Zefan kfree(fi_args); 2233027ed2f0SLi Zefan return ret; 2234475f6387SJan Schmidt } 2235475f6387SJan Schmidt 2236475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2237475f6387SJan Schmidt { 2238475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2239475f6387SJan Schmidt struct btrfs_device *dev; 2240475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2241475f6387SJan Schmidt int ret = 0; 2242475f6387SJan Schmidt char *s_uuid = NULL; 2243475f6387SJan Schmidt char empty_uuid[BTRFS_UUID_SIZE] = {0}; 2244475f6387SJan Schmidt 2245475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2246475f6387SJan Schmidt return -EPERM; 2247475f6387SJan Schmidt 2248475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2249475f6387SJan Schmidt if (IS_ERR(di_args)) 2250475f6387SJan Schmidt return PTR_ERR(di_args); 2251475f6387SJan Schmidt 2252475f6387SJan Schmidt if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0) 2253475f6387SJan Schmidt s_uuid = di_args->uuid; 2254475f6387SJan Schmidt 2255475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2256475f6387SJan Schmidt dev = btrfs_find_device(root, di_args->devid, s_uuid, NULL); 2257475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2258475f6387SJan Schmidt 2259475f6387SJan Schmidt if (!dev) { 2260475f6387SJan Schmidt ret = -ENODEV; 2261475f6387SJan Schmidt goto out; 2262475f6387SJan Schmidt } 2263475f6387SJan Schmidt 2264475f6387SJan Schmidt di_args->devid = dev->devid; 2265475f6387SJan Schmidt di_args->bytes_used = dev->bytes_used; 2266475f6387SJan Schmidt di_args->total_bytes = dev->total_bytes; 2267475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2268a27202fbSJim Meyering if (dev->name) { 2269606686eeSJosef Bacik struct rcu_string *name; 2270606686eeSJosef Bacik 2271606686eeSJosef Bacik rcu_read_lock(); 2272606686eeSJosef Bacik name = rcu_dereference(dev->name); 2273606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2274606686eeSJosef Bacik rcu_read_unlock(); 2275a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2276a27202fbSJim Meyering } else { 227799ba55adSStefan Behrens di_args->path[0] = '\0'; 2278a27202fbSJim Meyering } 2279475f6387SJan Schmidt 2280475f6387SJan Schmidt out: 2281475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2282475f6387SJan Schmidt ret = -EFAULT; 2283475f6387SJan Schmidt 2284475f6387SJan Schmidt kfree(di_args); 2285475f6387SJan Schmidt return ret; 2286475f6387SJan Schmidt } 2287475f6387SJan Schmidt 228876dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 2289b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 2290f46b5a66SChristoph Hellwig { 2291f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2292f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2293f46b5a66SChristoph Hellwig struct file *src_file; 2294f46b5a66SChristoph Hellwig struct inode *src; 2295f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2296f46b5a66SChristoph Hellwig struct btrfs_path *path; 2297f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 2298ae01a0abSYan Zheng char *buf; 2299ae01a0abSYan Zheng struct btrfs_key key; 2300f46b5a66SChristoph Hellwig u32 nritems; 2301f46b5a66SChristoph Hellwig int slot; 2302ae01a0abSYan Zheng int ret; 2303c5c9cd4dSSage Weil u64 len = olen; 2304c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 2305c5c9cd4dSSage Weil u64 hint_byte; 2306d20f7043SChris Mason 2307c5c9cd4dSSage Weil /* 2308c5c9cd4dSSage Weil * TODO: 2309c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 2310c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 2311c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 2312c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 2313c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 2314c5c9cd4dSSage Weil * they don't overlap)? 2315c5c9cd4dSSage Weil */ 2316c5c9cd4dSSage Weil 2317e441d54dSChris Mason /* the destination must be opened for writing */ 23182ebc3464SDan Rosenberg if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 2319e441d54dSChris Mason return -EINVAL; 2320e441d54dSChris Mason 2321b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2322b83cc969SLi Zefan return -EROFS; 2323b83cc969SLi Zefan 2324a561be71SAl Viro ret = mnt_want_write_file(file); 2325c146afadSYan Zheng if (ret) 2326c146afadSYan Zheng return ret; 2327c146afadSYan Zheng 2328c5c9cd4dSSage Weil src_file = fget(srcfd); 2329ab67b7c1SYan Zheng if (!src_file) { 2330ab67b7c1SYan Zheng ret = -EBADF; 2331ab67b7c1SYan Zheng goto out_drop_write; 2332ab67b7c1SYan Zheng } 23335dc64164SDan Rosenberg 2334f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 2335f46b5a66SChristoph Hellwig 2336c5c9cd4dSSage Weil ret = -EINVAL; 2337c5c9cd4dSSage Weil if (src == inode) 2338c5c9cd4dSSage Weil goto out_fput; 2339c5c9cd4dSSage Weil 23405dc64164SDan Rosenberg /* the src must be open for reading */ 23415dc64164SDan Rosenberg if (!(src_file->f_mode & FMODE_READ)) 23425dc64164SDan Rosenberg goto out_fput; 23435dc64164SDan Rosenberg 23440e7b824cSLi Zefan /* don't make the dst file partly checksummed */ 23450e7b824cSLi Zefan if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 23460e7b824cSLi Zefan (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 23470e7b824cSLi Zefan goto out_fput; 23480e7b824cSLi Zefan 2349ae01a0abSYan Zheng ret = -EISDIR; 2350ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 2351f46b5a66SChristoph Hellwig goto out_fput; 2352f46b5a66SChristoph Hellwig 2353ae01a0abSYan Zheng ret = -EXDEV; 2354ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 2355ae01a0abSYan Zheng goto out_fput; 2356ae01a0abSYan Zheng 2357ae01a0abSYan Zheng ret = -ENOMEM; 2358ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 2359ae01a0abSYan Zheng if (!buf) 2360ae01a0abSYan Zheng goto out_fput; 2361ae01a0abSYan Zheng 2362ae01a0abSYan Zheng path = btrfs_alloc_path(); 2363ae01a0abSYan Zheng if (!path) { 2364ae01a0abSYan Zheng vfree(buf); 2365ae01a0abSYan Zheng goto out_fput; 2366ae01a0abSYan Zheng } 2367ae01a0abSYan Zheng path->reada = 2; 2368ae01a0abSYan Zheng 2369f46b5a66SChristoph Hellwig if (inode < src) { 2370fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 2371fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 2372f46b5a66SChristoph Hellwig } else { 2373fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 2374fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 2375f46b5a66SChristoph Hellwig } 2376f46b5a66SChristoph Hellwig 2377c5c9cd4dSSage Weil /* determine range to clone */ 2378c5c9cd4dSSage Weil ret = -EINVAL; 23792ebc3464SDan Rosenberg if (off + len > src->i_size || off + len < off) 2380f46b5a66SChristoph Hellwig goto out_unlock; 2381c5c9cd4dSSage Weil if (len == 0) 2382c5c9cd4dSSage Weil olen = len = src->i_size - off; 2383c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 2384c5c9cd4dSSage Weil if (off + len == src->i_size) 23852a6b8daeSLi Zefan len = ALIGN(src->i_size, bs) - off; 2386c5c9cd4dSSage Weil 2387c5c9cd4dSSage Weil /* verify the end result is block aligned */ 23882a6b8daeSLi Zefan if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 23892a6b8daeSLi Zefan !IS_ALIGNED(destoff, bs)) 2390c5c9cd4dSSage Weil goto out_unlock; 2391c5c9cd4dSSage Weil 2392d525e8abSLi Zefan if (destoff > inode->i_size) { 2393d525e8abSLi Zefan ret = btrfs_cont_expand(inode, inode->i_size, destoff); 2394d525e8abSLi Zefan if (ret) 2395d525e8abSLi Zefan goto out_unlock; 2396d525e8abSLi Zefan } 2397d525e8abSLi Zefan 239871ef0786SLi Zefan /* truncate page cache pages from target inode range */ 239971ef0786SLi Zefan truncate_inode_pages_range(&inode->i_data, destoff, 240071ef0786SLi Zefan PAGE_CACHE_ALIGN(destoff + len) - 1); 240171ef0786SLi Zefan 2402f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 2403f46b5a66SChristoph Hellwig another, and lock file content */ 2404f46b5a66SChristoph Hellwig while (1) { 240531840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 2406d0082371SJeff Mahoney lock_extent(&BTRFS_I(src)->io_tree, off, off+len); 24079a019196SSage Weil ordered = btrfs_lookup_first_ordered_extent(src, off+len); 24089a019196SSage Weil if (!ordered && 24099a019196SSage Weil !test_range_bit(&BTRFS_I(src)->io_tree, off, off+len, 24109a019196SSage Weil EXTENT_DELALLOC, 0, NULL)) 2411f46b5a66SChristoph Hellwig break; 2412d0082371SJeff Mahoney unlock_extent(&BTRFS_I(src)->io_tree, off, off+len); 2413ae01a0abSYan Zheng if (ordered) 2414ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 24159a019196SSage Weil btrfs_wait_ordered_range(src, off, len); 2416f46b5a66SChristoph Hellwig } 2417f46b5a66SChristoph Hellwig 2418c5c9cd4dSSage Weil /* clone data */ 241933345d01SLi Zefan key.objectid = btrfs_ino(src); 2420ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 2421ae01a0abSYan Zheng key.offset = 0; 2422f46b5a66SChristoph Hellwig 2423f46b5a66SChristoph Hellwig while (1) { 2424f46b5a66SChristoph Hellwig /* 2425f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 2426f46b5a66SChristoph Hellwig * tree. 2427f46b5a66SChristoph Hellwig */ 2428a22285a6SYan, Zheng ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 2429f46b5a66SChristoph Hellwig if (ret < 0) 2430f46b5a66SChristoph Hellwig goto out; 2431f46b5a66SChristoph Hellwig 2432ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2433ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 2434f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 2435f46b5a66SChristoph Hellwig if (ret < 0) 2436f46b5a66SChristoph Hellwig goto out; 2437f46b5a66SChristoph Hellwig if (ret > 0) 2438f46b5a66SChristoph Hellwig break; 2439ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2440f46b5a66SChristoph Hellwig } 2441f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 2442f46b5a66SChristoph Hellwig slot = path->slots[0]; 2443f46b5a66SChristoph Hellwig 2444ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 2445d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 244633345d01SLi Zefan key.objectid != btrfs_ino(src)) 2447f46b5a66SChristoph Hellwig break; 2448f46b5a66SChristoph Hellwig 2449c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 2450c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 2451c5c9cd4dSSage Weil int type; 245231840ae1SZheng Yan u32 size; 245331840ae1SZheng Yan struct btrfs_key new_key; 2454c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 2455c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 2456c5c9cd4dSSage Weil u8 comp; 2457b5384d48SSage Weil u64 endoff; 245831840ae1SZheng Yan 245931840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 246031840ae1SZheng Yan read_extent_buffer(leaf, buf, 246131840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 246231840ae1SZheng Yan size); 2463c5c9cd4dSSage Weil 2464c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 2465c5c9cd4dSSage Weil struct btrfs_file_extent_item); 2466c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 2467c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 2468c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2469c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2470d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 2471d397712bSChris Mason extent); 2472d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 2473d397712bSChris Mason extent); 2474c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 2475d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 2476d397712bSChris Mason extent); 2477c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2478c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 2479c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 2480c5c9cd4dSSage Weil extent); 2481c5c9cd4dSSage Weil } 2482b3b4aa74SDavid Sterba btrfs_release_path(path); 248331840ae1SZheng Yan 2484050006a7SSage Weil if (key.offset + datal <= off || 2485c5c9cd4dSSage Weil key.offset >= off+len) 2486c5c9cd4dSSage Weil goto next; 2487c5c9cd4dSSage Weil 248831840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 248933345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 24904d728ec7SLi Zefan if (off <= key.offset) 2491c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 24924d728ec7SLi Zefan else 24934d728ec7SLi Zefan new_key.offset = destoff; 2494c5c9cd4dSSage Weil 2495b6f3409bSSage Weil /* 2496b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 2497b6f3409bSSage Weil * 1 - add new extent 2498b6f3409bSSage Weil * 1 - inode update 2499b6f3409bSSage Weil */ 2500b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 2501a22285a6SYan, Zheng if (IS_ERR(trans)) { 2502a22285a6SYan, Zheng ret = PTR_ERR(trans); 2503a22285a6SYan, Zheng goto out; 2504a22285a6SYan, Zheng } 2505a22285a6SYan, Zheng 2506c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2507c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2508d72c0842SLi Zefan /* 2509d72c0842SLi Zefan * a | --- range to clone ---| b 2510d72c0842SLi Zefan * | ------------- extent ------------- | 2511d72c0842SLi Zefan */ 2512d72c0842SLi Zefan 2513d72c0842SLi Zefan /* substract range b */ 2514d72c0842SLi Zefan if (key.offset + datal > off + len) 2515d72c0842SLi Zefan datal = off + len - key.offset; 2516d72c0842SLi Zefan 2517d72c0842SLi Zefan /* substract range a */ 2518a22285a6SYan, Zheng if (off > key.offset) { 2519a22285a6SYan, Zheng datao += off - key.offset; 2520a22285a6SYan, Zheng datal -= off - key.offset; 2521a22285a6SYan, Zheng } 2522a22285a6SYan, Zheng 2523a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 2524a22285a6SYan, Zheng new_key.offset, 2525a22285a6SYan, Zheng new_key.offset + datal, 2526a22285a6SYan, Zheng &hint_byte, 1); 252779787eaaSJeff Mahoney if (ret) { 252879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 252979787eaaSJeff Mahoney ret); 253079787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 253179787eaaSJeff Mahoney goto out; 253279787eaaSJeff Mahoney } 2533a22285a6SYan, Zheng 253431840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 253531840ae1SZheng Yan &new_key, size); 253679787eaaSJeff Mahoney if (ret) { 253779787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 253879787eaaSJeff Mahoney ret); 253979787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 254079787eaaSJeff Mahoney goto out; 254179787eaaSJeff Mahoney } 254231840ae1SZheng Yan 254331840ae1SZheng Yan leaf = path->nodes[0]; 254431840ae1SZheng Yan slot = path->slots[0]; 254531840ae1SZheng Yan write_extent_buffer(leaf, buf, 254631840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 254731840ae1SZheng Yan size); 2548ae01a0abSYan Zheng 2549f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 2550f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 2551c5c9cd4dSSage Weil 2552c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 2553c5c9cd4dSSage Weil if (!disko) 2554c5c9cd4dSSage Weil datao = 0; 2555c5c9cd4dSSage Weil 2556c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 2557c5c9cd4dSSage Weil datao); 2558c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 2559c5c9cd4dSSage Weil datal); 2560c5c9cd4dSSage Weil if (disko) { 2561c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2562ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 25635d4f98a2SYan Zheng disko, diskl, 0, 2564f46b5a66SChristoph Hellwig root->root_key.objectid, 256533345d01SLi Zefan btrfs_ino(inode), 256666d7e7f0SArne Jansen new_key.offset - datao, 256766d7e7f0SArne Jansen 0); 256879787eaaSJeff Mahoney if (ret) { 256979787eaaSJeff Mahoney btrfs_abort_transaction(trans, 257079787eaaSJeff Mahoney root, 257179787eaaSJeff Mahoney ret); 257279787eaaSJeff Mahoney btrfs_end_transaction(trans, 257379787eaaSJeff Mahoney root); 257479787eaaSJeff Mahoney goto out; 257579787eaaSJeff Mahoney 257679787eaaSJeff Mahoney } 2577f46b5a66SChristoph Hellwig } 2578c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2579c5c9cd4dSSage Weil u64 skip = 0; 2580c5c9cd4dSSage Weil u64 trim = 0; 2581c5c9cd4dSSage Weil if (off > key.offset) { 2582c5c9cd4dSSage Weil skip = off - key.offset; 2583c5c9cd4dSSage Weil new_key.offset += skip; 258431840ae1SZheng Yan } 2585d397712bSChris Mason 2586c5c9cd4dSSage Weil if (key.offset + datal > off+len) 2587c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 2588d397712bSChris Mason 2589c5c9cd4dSSage Weil if (comp && (skip || trim)) { 2590c5c9cd4dSSage Weil ret = -EINVAL; 2591a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 2592c5c9cd4dSSage Weil goto out; 259331840ae1SZheng Yan } 2594c5c9cd4dSSage Weil size -= skip + trim; 2595c5c9cd4dSSage Weil datal -= skip + trim; 2596a22285a6SYan, Zheng 2597a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 2598a22285a6SYan, Zheng new_key.offset, 2599a22285a6SYan, Zheng new_key.offset + datal, 2600a22285a6SYan, Zheng &hint_byte, 1); 260179787eaaSJeff Mahoney if (ret) { 260279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 260379787eaaSJeff Mahoney ret); 260479787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 260579787eaaSJeff Mahoney goto out; 260679787eaaSJeff Mahoney } 2607a22285a6SYan, Zheng 2608c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 2609c5c9cd4dSSage Weil &new_key, size); 261079787eaaSJeff Mahoney if (ret) { 261179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 261279787eaaSJeff Mahoney ret); 261379787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 261479787eaaSJeff Mahoney goto out; 261579787eaaSJeff Mahoney } 2616c5c9cd4dSSage Weil 2617c5c9cd4dSSage Weil if (skip) { 2618d397712bSChris Mason u32 start = 2619d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 2620c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 2621c5c9cd4dSSage Weil datal); 2622c5c9cd4dSSage Weil } 2623c5c9cd4dSSage Weil 2624c5c9cd4dSSage Weil leaf = path->nodes[0]; 2625c5c9cd4dSSage Weil slot = path->slots[0]; 2626c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 2627c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 2628c5c9cd4dSSage Weil size); 2629c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2630c5c9cd4dSSage Weil } 2631c5c9cd4dSSage Weil 2632c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 2633b3b4aa74SDavid Sterba btrfs_release_path(path); 2634c5c9cd4dSSage Weil 26350c4d2d95SJosef Bacik inode_inc_iversion(inode); 2636a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 2637b5384d48SSage Weil 2638b5384d48SSage Weil /* 2639b5384d48SSage Weil * we round up to the block size at eof when 2640b5384d48SSage Weil * determining which extents to clone above, 2641b5384d48SSage Weil * but shouldn't round up the file size 2642b5384d48SSage Weil */ 2643b5384d48SSage Weil endoff = new_key.offset + datal; 26445f3888ffSLi Zefan if (endoff > destoff+olen) 26455f3888ffSLi Zefan endoff = destoff+olen; 2646b5384d48SSage Weil if (endoff > inode->i_size) 2647b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 2648b5384d48SSage Weil 2649a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 265079787eaaSJeff Mahoney if (ret) { 265179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 2652a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 265379787eaaSJeff Mahoney goto out; 265479787eaaSJeff Mahoney } 265579787eaaSJeff Mahoney ret = btrfs_end_transaction(trans, root); 2656a22285a6SYan, Zheng } 2657c5c9cd4dSSage Weil next: 2658b3b4aa74SDavid Sterba btrfs_release_path(path); 2659ae01a0abSYan Zheng key.offset++; 2660ae01a0abSYan Zheng } 2661f46b5a66SChristoph Hellwig ret = 0; 2662f46b5a66SChristoph Hellwig out: 2663b3b4aa74SDavid Sterba btrfs_release_path(path); 2664d0082371SJeff Mahoney unlock_extent(&BTRFS_I(src)->io_tree, off, off+len); 2665f46b5a66SChristoph Hellwig out_unlock: 2666f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 2667f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 2668ae01a0abSYan Zheng vfree(buf); 2669ae01a0abSYan Zheng btrfs_free_path(path); 2670f46b5a66SChristoph Hellwig out_fput: 2671f46b5a66SChristoph Hellwig fput(src_file); 2672ab67b7c1SYan Zheng out_drop_write: 26732a79f17eSAl Viro mnt_drop_write_file(file); 2674f46b5a66SChristoph Hellwig return ret; 2675f46b5a66SChristoph Hellwig } 2676f46b5a66SChristoph Hellwig 26777a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 2678c5c9cd4dSSage Weil { 2679c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 2680c5c9cd4dSSage Weil 26817a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 2682c5c9cd4dSSage Weil return -EFAULT; 2683c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 2684c5c9cd4dSSage Weil args.src_length, args.dest_offset); 2685c5c9cd4dSSage Weil } 2686c5c9cd4dSSage Weil 2687f46b5a66SChristoph Hellwig /* 2688f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2689f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2690f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2691f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2692f46b5a66SChristoph Hellwig */ 2693b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 2694f46b5a66SChristoph Hellwig { 2695f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2696f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2697f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 26981ab86aedSSage Weil int ret; 2699f46b5a66SChristoph Hellwig 27001ab86aedSSage Weil ret = -EPERM; 2701df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 2702f46b5a66SChristoph Hellwig goto out; 27031ab86aedSSage Weil 27041ab86aedSSage Weil ret = -EINPROGRESS; 27051ab86aedSSage Weil if (file->private_data) 27061ab86aedSSage Weil goto out; 27079ca9ee09SSage Weil 2708b83cc969SLi Zefan ret = -EROFS; 2709b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2710b83cc969SLi Zefan goto out; 2711b83cc969SLi Zefan 2712a561be71SAl Viro ret = mnt_want_write_file(file); 2713c146afadSYan Zheng if (ret) 2714c146afadSYan Zheng goto out; 2715c146afadSYan Zheng 2716a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 27179ca9ee09SSage Weil 2718f46b5a66SChristoph Hellwig ret = -ENOMEM; 27197a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 2720abd30bb0STsutomu Itoh if (IS_ERR(trans)) 27211ab86aedSSage Weil goto out_drop; 27221ab86aedSSage Weil 27231ab86aedSSage Weil file->private_data = trans; 27241ab86aedSSage Weil return 0; 27251ab86aedSSage Weil 27261ab86aedSSage Weil out_drop: 2727a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 27282a79f17eSAl Viro mnt_drop_write_file(file); 2729f46b5a66SChristoph Hellwig out: 2730f46b5a66SChristoph Hellwig return ret; 2731f46b5a66SChristoph Hellwig } 2732f46b5a66SChristoph Hellwig 27336ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 27346ef5ed0dSJosef Bacik { 27356ef5ed0dSJosef Bacik struct inode *inode = fdentry(file)->d_inode; 27366ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 27376ef5ed0dSJosef Bacik struct btrfs_root *new_root; 27386ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 27396ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 27406ef5ed0dSJosef Bacik struct btrfs_path *path; 27416ef5ed0dSJosef Bacik struct btrfs_key location; 27426ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 27436ef5ed0dSJosef Bacik struct btrfs_super_block *disk_super; 27446ef5ed0dSJosef Bacik u64 features; 27456ef5ed0dSJosef Bacik u64 objectid = 0; 27466ef5ed0dSJosef Bacik u64 dir_id; 27476ef5ed0dSJosef Bacik 27486ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 27496ef5ed0dSJosef Bacik return -EPERM; 27506ef5ed0dSJosef Bacik 27516ef5ed0dSJosef Bacik if (copy_from_user(&objectid, argp, sizeof(objectid))) 27526ef5ed0dSJosef Bacik return -EFAULT; 27536ef5ed0dSJosef Bacik 27546ef5ed0dSJosef Bacik if (!objectid) 27556ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 27566ef5ed0dSJosef Bacik 27576ef5ed0dSJosef Bacik location.objectid = objectid; 27586ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 27596ef5ed0dSJosef Bacik location.offset = (u64)-1; 27606ef5ed0dSJosef Bacik 27616ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 27626ef5ed0dSJosef Bacik if (IS_ERR(new_root)) 27636ef5ed0dSJosef Bacik return PTR_ERR(new_root); 27646ef5ed0dSJosef Bacik 27656ef5ed0dSJosef Bacik if (btrfs_root_refs(&new_root->root_item) == 0) 27666ef5ed0dSJosef Bacik return -ENOENT; 27676ef5ed0dSJosef Bacik 27686ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 27696ef5ed0dSJosef Bacik if (!path) 27706ef5ed0dSJosef Bacik return -ENOMEM; 27716ef5ed0dSJosef Bacik path->leave_spinning = 1; 27726ef5ed0dSJosef Bacik 27736ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 277498d5dc13STsutomu Itoh if (IS_ERR(trans)) { 27756ef5ed0dSJosef Bacik btrfs_free_path(path); 277698d5dc13STsutomu Itoh return PTR_ERR(trans); 27776ef5ed0dSJosef Bacik } 27786ef5ed0dSJosef Bacik 27796c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 27806ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 27816ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 2782cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 27836ef5ed0dSJosef Bacik btrfs_free_path(path); 27846ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 27856ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 27866ef5ed0dSJosef Bacik "this isn't going to work\n"); 27876ef5ed0dSJosef Bacik return -ENOENT; 27886ef5ed0dSJosef Bacik } 27896ef5ed0dSJosef Bacik 27906ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 27916ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 27926ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 27936ef5ed0dSJosef Bacik btrfs_free_path(path); 27946ef5ed0dSJosef Bacik 27956c41761fSDavid Sterba disk_super = root->fs_info->super_copy; 27966ef5ed0dSJosef Bacik features = btrfs_super_incompat_flags(disk_super); 27976ef5ed0dSJosef Bacik if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { 27986ef5ed0dSJosef Bacik features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; 27996ef5ed0dSJosef Bacik btrfs_set_super_incompat_flags(disk_super, features); 28006ef5ed0dSJosef Bacik } 28016ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 28026ef5ed0dSJosef Bacik 28036ef5ed0dSJosef Bacik return 0; 28046ef5ed0dSJosef Bacik } 28056ef5ed0dSJosef Bacik 2806bf5fc093SJosef Bacik static void get_block_group_info(struct list_head *groups_list, 2807bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 2808bf5fc093SJosef Bacik { 2809bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 2810bf5fc093SJosef Bacik 2811bf5fc093SJosef Bacik space->total_bytes = 0; 2812bf5fc093SJosef Bacik space->used_bytes = 0; 2813bf5fc093SJosef Bacik space->flags = 0; 2814bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 2815bf5fc093SJosef Bacik space->flags = block_group->flags; 2816bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 2817bf5fc093SJosef Bacik space->used_bytes += 2818bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 2819bf5fc093SJosef Bacik } 2820bf5fc093SJosef Bacik } 2821bf5fc093SJosef Bacik 28221406e432SJosef Bacik long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 28231406e432SJosef Bacik { 28241406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 28251406e432SJosef Bacik struct btrfs_ioctl_space_info space; 28261406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 28277fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 282813f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 28291406e432SJosef Bacik struct btrfs_space_info *info; 2830bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 2831bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 2832bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 2833bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 2834bf5fc093SJosef Bacik int num_types = 4; 28357fde62bfSChris Mason int alloc_size; 28361406e432SJosef Bacik int ret = 0; 283751788b1bSDan Rosenberg u64 slot_count = 0; 2838bf5fc093SJosef Bacik int i, c; 28391406e432SJosef Bacik 28401406e432SJosef Bacik if (copy_from_user(&space_args, 28411406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 28421406e432SJosef Bacik sizeof(space_args))) 28431406e432SJosef Bacik return -EFAULT; 28441406e432SJosef Bacik 2845bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2846bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2847bf5fc093SJosef Bacik 2848bf5fc093SJosef Bacik info = NULL; 28497fde62bfSChris Mason rcu_read_lock(); 2850bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2851bf5fc093SJosef Bacik list) { 2852bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2853bf5fc093SJosef Bacik info = tmp; 2854bf5fc093SJosef Bacik break; 2855bf5fc093SJosef Bacik } 2856bf5fc093SJosef Bacik } 28577fde62bfSChris Mason rcu_read_unlock(); 28581406e432SJosef Bacik 2859bf5fc093SJosef Bacik if (!info) 2860bf5fc093SJosef Bacik continue; 2861bf5fc093SJosef Bacik 2862bf5fc093SJosef Bacik down_read(&info->groups_sem); 2863bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2864bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 2865bf5fc093SJosef Bacik slot_count++; 2866bf5fc093SJosef Bacik } 2867bf5fc093SJosef Bacik up_read(&info->groups_sem); 2868bf5fc093SJosef Bacik } 2869bf5fc093SJosef Bacik 28707fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 28717fde62bfSChris Mason if (space_args.space_slots == 0) { 28727fde62bfSChris Mason space_args.total_spaces = slot_count; 28737fde62bfSChris Mason goto out; 28747fde62bfSChris Mason } 2875bf5fc093SJosef Bacik 287651788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 2877bf5fc093SJosef Bacik 28787fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 2879bf5fc093SJosef Bacik 28807fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 28817fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 28827fde62bfSChris Mason */ 28837fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 28847fde62bfSChris Mason return -ENOMEM; 28857fde62bfSChris Mason 28867fde62bfSChris Mason space_args.total_spaces = 0; 28877fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 28887fde62bfSChris Mason if (!dest) 28897fde62bfSChris Mason return -ENOMEM; 28907fde62bfSChris Mason dest_orig = dest; 28917fde62bfSChris Mason 28927fde62bfSChris Mason /* now we have a buffer to copy into */ 2893bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2894bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2895bf5fc093SJosef Bacik 289651788b1bSDan Rosenberg if (!slot_count) 289751788b1bSDan Rosenberg break; 289851788b1bSDan Rosenberg 2899bf5fc093SJosef Bacik info = NULL; 29001406e432SJosef Bacik rcu_read_lock(); 2901bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2902bf5fc093SJosef Bacik list) { 2903bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2904bf5fc093SJosef Bacik info = tmp; 29057fde62bfSChris Mason break; 2906bf5fc093SJosef Bacik } 2907bf5fc093SJosef Bacik } 2908bf5fc093SJosef Bacik rcu_read_unlock(); 29097fde62bfSChris Mason 2910bf5fc093SJosef Bacik if (!info) 2911bf5fc093SJosef Bacik continue; 2912bf5fc093SJosef Bacik down_read(&info->groups_sem); 2913bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2914bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 2915bf5fc093SJosef Bacik get_block_group_info(&info->block_groups[c], 2916bf5fc093SJosef Bacik &space); 29177fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 29181406e432SJosef Bacik dest++; 29191406e432SJosef Bacik space_args.total_spaces++; 292051788b1bSDan Rosenberg slot_count--; 29211406e432SJosef Bacik } 292251788b1bSDan Rosenberg if (!slot_count) 292351788b1bSDan Rosenberg break; 2924bf5fc093SJosef Bacik } 2925bf5fc093SJosef Bacik up_read(&info->groups_sem); 2926bf5fc093SJosef Bacik } 29271406e432SJosef Bacik 29282eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 29297fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 29307fde62bfSChris Mason 29317fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 29327fde62bfSChris Mason ret = -EFAULT; 29337fde62bfSChris Mason 29347fde62bfSChris Mason kfree(dest_orig); 29357fde62bfSChris Mason out: 29367fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 29371406e432SJosef Bacik ret = -EFAULT; 29381406e432SJosef Bacik 29391406e432SJosef Bacik return ret; 29401406e432SJosef Bacik } 29411406e432SJosef Bacik 2942f46b5a66SChristoph Hellwig /* 2943f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2944f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2945f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2946f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2947f46b5a66SChristoph Hellwig */ 2948f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 2949f46b5a66SChristoph Hellwig { 2950f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2951f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2952f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2953f46b5a66SChristoph Hellwig 2954f46b5a66SChristoph Hellwig trans = file->private_data; 29551ab86aedSSage Weil if (!trans) 29561ab86aedSSage Weil return -EINVAL; 2957b214107eSChristoph Hellwig file->private_data = NULL; 29589ca9ee09SSage Weil 29591ab86aedSSage Weil btrfs_end_transaction(trans, root); 29601ab86aedSSage Weil 2961a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 29629ca9ee09SSage Weil 29632a79f17eSAl Viro mnt_drop_write_file(file); 29641ab86aedSSage Weil return 0; 2965f46b5a66SChristoph Hellwig } 2966f46b5a66SChristoph Hellwig 296746204592SSage Weil static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp) 296846204592SSage Weil { 296946204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 297046204592SSage Weil struct btrfs_trans_handle *trans; 297146204592SSage Weil u64 transid; 2972db5b493aSTsutomu Itoh int ret; 297346204592SSage Weil 297446204592SSage Weil trans = btrfs_start_transaction(root, 0); 297598d5dc13STsutomu Itoh if (IS_ERR(trans)) 297698d5dc13STsutomu Itoh return PTR_ERR(trans); 297746204592SSage Weil transid = trans->transid; 2978db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 29798b2b2d3cSTsutomu Itoh if (ret) { 29808b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 2981db5b493aSTsutomu Itoh return ret; 29828b2b2d3cSTsutomu Itoh } 298346204592SSage Weil 298446204592SSage Weil if (argp) 298546204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 298646204592SSage Weil return -EFAULT; 298746204592SSage Weil return 0; 298846204592SSage Weil } 298946204592SSage Weil 299046204592SSage Weil static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) 299146204592SSage Weil { 299246204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 299346204592SSage Weil u64 transid; 299446204592SSage Weil 299546204592SSage Weil if (argp) { 299646204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 299746204592SSage Weil return -EFAULT; 299846204592SSage Weil } else { 299946204592SSage Weil transid = 0; /* current trans */ 300046204592SSage Weil } 300146204592SSage Weil return btrfs_wait_for_commit(root, transid); 300246204592SSage Weil } 300346204592SSage Weil 3004475f6387SJan Schmidt static long btrfs_ioctl_scrub(struct btrfs_root *root, void __user *arg) 3005475f6387SJan Schmidt { 3006475f6387SJan Schmidt int ret; 3007475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3008475f6387SJan Schmidt 3009475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3010475f6387SJan Schmidt return -EPERM; 3011475f6387SJan Schmidt 3012475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3013475f6387SJan Schmidt if (IS_ERR(sa)) 3014475f6387SJan Schmidt return PTR_ERR(sa); 3015475f6387SJan Schmidt 3016475f6387SJan Schmidt ret = btrfs_scrub_dev(root, sa->devid, sa->start, sa->end, 30178628764eSArne Jansen &sa->progress, sa->flags & BTRFS_SCRUB_READONLY); 3018475f6387SJan Schmidt 3019475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3020475f6387SJan Schmidt ret = -EFAULT; 3021475f6387SJan Schmidt 3022475f6387SJan Schmidt kfree(sa); 3023475f6387SJan Schmidt return ret; 3024475f6387SJan Schmidt } 3025475f6387SJan Schmidt 3026475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 3027475f6387SJan Schmidt { 3028475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3029475f6387SJan Schmidt return -EPERM; 3030475f6387SJan Schmidt 3031475f6387SJan Schmidt return btrfs_scrub_cancel(root); 3032475f6387SJan Schmidt } 3033475f6387SJan Schmidt 3034475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 3035475f6387SJan Schmidt void __user *arg) 3036475f6387SJan Schmidt { 3037475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3038475f6387SJan Schmidt int ret; 3039475f6387SJan Schmidt 3040475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3041475f6387SJan Schmidt return -EPERM; 3042475f6387SJan Schmidt 3043475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3044475f6387SJan Schmidt if (IS_ERR(sa)) 3045475f6387SJan Schmidt return PTR_ERR(sa); 3046475f6387SJan Schmidt 3047475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 3048475f6387SJan Schmidt 3049475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3050475f6387SJan Schmidt ret = -EFAULT; 3051475f6387SJan Schmidt 3052475f6387SJan Schmidt kfree(sa); 3053475f6387SJan Schmidt return ret; 3054475f6387SJan Schmidt } 3055475f6387SJan Schmidt 3056c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 3057c11d2c23SStefan Behrens void __user *arg, int reset_after_read) 3058c11d2c23SStefan Behrens { 3059c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3060c11d2c23SStefan Behrens int ret; 3061c11d2c23SStefan Behrens 3062c11d2c23SStefan Behrens if (reset_after_read && !capable(CAP_SYS_ADMIN)) 3063c11d2c23SStefan Behrens return -EPERM; 3064c11d2c23SStefan Behrens 3065c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3066c11d2c23SStefan Behrens if (IS_ERR(sa)) 3067c11d2c23SStefan Behrens return PTR_ERR(sa); 3068c11d2c23SStefan Behrens 3069c11d2c23SStefan Behrens ret = btrfs_get_dev_stats(root, sa, reset_after_read); 3070c11d2c23SStefan Behrens 3071c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 3072c11d2c23SStefan Behrens ret = -EFAULT; 3073c11d2c23SStefan Behrens 3074c11d2c23SStefan Behrens kfree(sa); 3075c11d2c23SStefan Behrens return ret; 3076c11d2c23SStefan Behrens } 3077c11d2c23SStefan Behrens 3078d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3079d7728c96SJan Schmidt { 3080d7728c96SJan Schmidt int ret = 0; 3081d7728c96SJan Schmidt int i; 3082740c3d22SChris Mason u64 rel_ptr; 3083d7728c96SJan Schmidt int size; 3084806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3085d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3086d7728c96SJan Schmidt struct btrfs_path *path; 3087d7728c96SJan Schmidt 3088d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3089d7728c96SJan Schmidt return -EPERM; 3090d7728c96SJan Schmidt 3091d7728c96SJan Schmidt path = btrfs_alloc_path(); 3092d7728c96SJan Schmidt if (!path) { 3093d7728c96SJan Schmidt ret = -ENOMEM; 3094d7728c96SJan Schmidt goto out; 3095d7728c96SJan Schmidt } 3096d7728c96SJan Schmidt 3097d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3098d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3099d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3100d7728c96SJan Schmidt ipa = NULL; 3101d7728c96SJan Schmidt goto out; 3102d7728c96SJan Schmidt } 3103d7728c96SJan Schmidt 3104d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3105d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3106d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3107d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3108d7728c96SJan Schmidt ipath = NULL; 3109d7728c96SJan Schmidt goto out; 3110d7728c96SJan Schmidt } 3111d7728c96SJan Schmidt 3112d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3113d7728c96SJan Schmidt if (ret < 0) 3114d7728c96SJan Schmidt goto out; 3115d7728c96SJan Schmidt 3116d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3117745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3118745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3119740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3120d7728c96SJan Schmidt } 3121d7728c96SJan Schmidt 3122745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 3123745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 3124d7728c96SJan Schmidt if (ret) { 3125d7728c96SJan Schmidt ret = -EFAULT; 3126d7728c96SJan Schmidt goto out; 3127d7728c96SJan Schmidt } 3128d7728c96SJan Schmidt 3129d7728c96SJan Schmidt out: 3130d7728c96SJan Schmidt btrfs_free_path(path); 3131d7728c96SJan Schmidt free_ipath(ipath); 3132d7728c96SJan Schmidt kfree(ipa); 3133d7728c96SJan Schmidt 3134d7728c96SJan Schmidt return ret; 3135d7728c96SJan Schmidt } 3136d7728c96SJan Schmidt 3137d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3138d7728c96SJan Schmidt { 3139d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3140d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3141d7728c96SJan Schmidt 3142d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3143d7728c96SJan Schmidt inodes->bytes_left -= c; 3144d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3145d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3146d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3147d7728c96SJan Schmidt inodes->elem_cnt += 3; 3148d7728c96SJan Schmidt } else { 3149d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3150d7728c96SJan Schmidt inodes->bytes_left = 0; 3151d7728c96SJan Schmidt inodes->elem_missed += 3; 3152d7728c96SJan Schmidt } 3153d7728c96SJan Schmidt 3154d7728c96SJan Schmidt return 0; 3155d7728c96SJan Schmidt } 3156d7728c96SJan Schmidt 3157d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 3158d7728c96SJan Schmidt void __user *arg) 3159d7728c96SJan Schmidt { 3160d7728c96SJan Schmidt int ret = 0; 3161d7728c96SJan Schmidt int size; 31624692cf58SJan Schmidt u64 extent_item_pos; 3163d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3164d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3165d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3166d7728c96SJan Schmidt struct btrfs_key key; 3167d7728c96SJan Schmidt 3168d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3169d7728c96SJan Schmidt return -EPERM; 3170d7728c96SJan Schmidt 3171d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 3172d7728c96SJan Schmidt if (IS_ERR(loi)) { 3173d7728c96SJan Schmidt ret = PTR_ERR(loi); 3174d7728c96SJan Schmidt loi = NULL; 3175d7728c96SJan Schmidt goto out; 3176d7728c96SJan Schmidt } 3177d7728c96SJan Schmidt 3178d7728c96SJan Schmidt path = btrfs_alloc_path(); 3179d7728c96SJan Schmidt if (!path) { 3180d7728c96SJan Schmidt ret = -ENOMEM; 3181d7728c96SJan Schmidt goto out; 3182d7728c96SJan Schmidt } 3183d7728c96SJan Schmidt 3184d7728c96SJan Schmidt size = min_t(u32, loi->size, 4096); 3185d7728c96SJan Schmidt inodes = init_data_container(size); 3186d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3187d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3188d7728c96SJan Schmidt inodes = NULL; 3189d7728c96SJan Schmidt goto out; 3190d7728c96SJan Schmidt } 3191d7728c96SJan Schmidt 3192d7728c96SJan Schmidt ret = extent_from_logical(root->fs_info, loi->logical, path, &key); 31934692cf58SJan Schmidt btrfs_release_path(path); 3194d7728c96SJan Schmidt 3195d7728c96SJan Schmidt if (ret & BTRFS_EXTENT_FLAG_TREE_BLOCK) 3196d7728c96SJan Schmidt ret = -ENOENT; 3197d7728c96SJan Schmidt if (ret < 0) 3198d7728c96SJan Schmidt goto out; 3199d7728c96SJan Schmidt 32004692cf58SJan Schmidt extent_item_pos = loi->logical - key.objectid; 32017a3ae2f8SJan Schmidt ret = iterate_extent_inodes(root->fs_info, key.objectid, 32027a3ae2f8SJan Schmidt extent_item_pos, 0, build_ino_list, 32034692cf58SJan Schmidt inodes); 3204d7728c96SJan Schmidt 3205d7728c96SJan Schmidt if (ret < 0) 3206d7728c96SJan Schmidt goto out; 3207d7728c96SJan Schmidt 3208745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 3209745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 3210d7728c96SJan Schmidt if (ret) 3211d7728c96SJan Schmidt ret = -EFAULT; 3212d7728c96SJan Schmidt 3213d7728c96SJan Schmidt out: 3214d7728c96SJan Schmidt btrfs_free_path(path); 3215d7728c96SJan Schmidt kfree(inodes); 3216d7728c96SJan Schmidt kfree(loi); 3217d7728c96SJan Schmidt 3218d7728c96SJan Schmidt return ret; 3219d7728c96SJan Schmidt } 3220d7728c96SJan Schmidt 322119a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 3222c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3223c9e9f97bSIlya Dryomov { 3224c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3225c9e9f97bSIlya Dryomov 3226c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3227c9e9f97bSIlya Dryomov 3228837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 3229837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3230837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3231837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3232a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3233a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3234837d5b6eSIlya Dryomov 3235c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3236c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3237c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 323819a39dceSIlya Dryomov 323919a39dceSIlya Dryomov if (lock) { 324019a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 324119a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 324219a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 324319a39dceSIlya Dryomov } else { 324419a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 324519a39dceSIlya Dryomov } 3246c9e9f97bSIlya Dryomov } 3247c9e9f97bSIlya Dryomov 32489ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3249c9e9f97bSIlya Dryomov { 32509ba1f6e4SLiu Bo struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 3251c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3252c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3253c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3254c9e9f97bSIlya Dryomov int ret; 3255c9e9f97bSIlya Dryomov 3256c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3257c9e9f97bSIlya Dryomov return -EPERM; 3258c9e9f97bSIlya Dryomov 3259c9e9f97bSIlya Dryomov if (fs_info->sb->s_flags & MS_RDONLY) 3260c9e9f97bSIlya Dryomov return -EROFS; 3261c9e9f97bSIlya Dryomov 32629ba1f6e4SLiu Bo ret = mnt_want_write(file->f_path.mnt); 32639ba1f6e4SLiu Bo if (ret) 32649ba1f6e4SLiu Bo return ret; 32659ba1f6e4SLiu Bo 3266c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 3267c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3268c9e9f97bSIlya Dryomov 3269c9e9f97bSIlya Dryomov if (arg) { 3270c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 3271c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 3272c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 3273c9e9f97bSIlya Dryomov goto out; 3274c9e9f97bSIlya Dryomov } 3275de322263SIlya Dryomov 3276de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3277de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3278de322263SIlya Dryomov ret = -ENOTCONN; 3279de322263SIlya Dryomov goto out_bargs; 3280de322263SIlya Dryomov } 3281de322263SIlya Dryomov 3282de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3283de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3284de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3285de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3286de322263SIlya Dryomov 3287de322263SIlya Dryomov goto do_balance; 3288de322263SIlya Dryomov } 3289c9e9f97bSIlya Dryomov } else { 3290c9e9f97bSIlya Dryomov bargs = NULL; 3291c9e9f97bSIlya Dryomov } 3292c9e9f97bSIlya Dryomov 3293837d5b6eSIlya Dryomov if (fs_info->balance_ctl) { 3294837d5b6eSIlya Dryomov ret = -EINPROGRESS; 3295837d5b6eSIlya Dryomov goto out_bargs; 3296837d5b6eSIlya Dryomov } 3297837d5b6eSIlya Dryomov 3298c9e9f97bSIlya Dryomov bctl = kzalloc(sizeof(*bctl), GFP_NOFS); 3299c9e9f97bSIlya Dryomov if (!bctl) { 3300c9e9f97bSIlya Dryomov ret = -ENOMEM; 3301c9e9f97bSIlya Dryomov goto out_bargs; 3302c9e9f97bSIlya Dryomov } 3303c9e9f97bSIlya Dryomov 3304c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 3305c9e9f97bSIlya Dryomov if (arg) { 3306c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 3307c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 3308c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 3309c9e9f97bSIlya Dryomov 3310c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 3311f43ffb60SIlya Dryomov } else { 3312f43ffb60SIlya Dryomov /* balance everything - no filters */ 3313f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 3314c9e9f97bSIlya Dryomov } 3315c9e9f97bSIlya Dryomov 3316de322263SIlya Dryomov do_balance: 3317c9e9f97bSIlya Dryomov ret = btrfs_balance(bctl, bargs); 3318c9e9f97bSIlya Dryomov /* 3319837d5b6eSIlya Dryomov * bctl is freed in __cancel_balance or in free_fs_info if 3320837d5b6eSIlya Dryomov * restriper was paused all the way until unmount 3321c9e9f97bSIlya Dryomov */ 3322c9e9f97bSIlya Dryomov if (arg) { 3323c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 3324c9e9f97bSIlya Dryomov ret = -EFAULT; 3325c9e9f97bSIlya Dryomov } 3326c9e9f97bSIlya Dryomov 3327c9e9f97bSIlya Dryomov out_bargs: 3328c9e9f97bSIlya Dryomov kfree(bargs); 3329c9e9f97bSIlya Dryomov out: 3330c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3331c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 33329ba1f6e4SLiu Bo mnt_drop_write(file->f_path.mnt); 3333c9e9f97bSIlya Dryomov return ret; 3334c9e9f97bSIlya Dryomov } 3335c9e9f97bSIlya Dryomov 3336837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 3337837d5b6eSIlya Dryomov { 3338837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3339837d5b6eSIlya Dryomov return -EPERM; 3340837d5b6eSIlya Dryomov 3341837d5b6eSIlya Dryomov switch (cmd) { 3342837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 3343837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 3344a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 3345a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 3346837d5b6eSIlya Dryomov } 3347837d5b6eSIlya Dryomov 3348837d5b6eSIlya Dryomov return -EINVAL; 3349837d5b6eSIlya Dryomov } 3350837d5b6eSIlya Dryomov 335119a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 335219a39dceSIlya Dryomov void __user *arg) 335319a39dceSIlya Dryomov { 335419a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 335519a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 335619a39dceSIlya Dryomov int ret = 0; 335719a39dceSIlya Dryomov 335819a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 335919a39dceSIlya Dryomov return -EPERM; 336019a39dceSIlya Dryomov 336119a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 336219a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 336319a39dceSIlya Dryomov ret = -ENOTCONN; 336419a39dceSIlya Dryomov goto out; 336519a39dceSIlya Dryomov } 336619a39dceSIlya Dryomov 336719a39dceSIlya Dryomov bargs = kzalloc(sizeof(*bargs), GFP_NOFS); 336819a39dceSIlya Dryomov if (!bargs) { 336919a39dceSIlya Dryomov ret = -ENOMEM; 337019a39dceSIlya Dryomov goto out; 337119a39dceSIlya Dryomov } 337219a39dceSIlya Dryomov 337319a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 337419a39dceSIlya Dryomov 337519a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 337619a39dceSIlya Dryomov ret = -EFAULT; 337719a39dceSIlya Dryomov 337819a39dceSIlya Dryomov kfree(bargs); 337919a39dceSIlya Dryomov out: 338019a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 338119a39dceSIlya Dryomov return ret; 338219a39dceSIlya Dryomov } 338319a39dceSIlya Dryomov 3384f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 3385f46b5a66SChristoph Hellwig cmd, unsigned long arg) 3386f46b5a66SChristoph Hellwig { 3387f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 33884bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 3389f46b5a66SChristoph Hellwig 3390f46b5a66SChristoph Hellwig switch (cmd) { 33916cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 33926cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 33936cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 33946cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 33956cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 33966cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 3397f7039b1dSLi Dongyang case FITRIM: 3398f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 3399f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 3400fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 3401fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 3402fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 34033de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 3404fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 340576dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 340676dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 34070caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 34080caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 34090caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 34100caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 34116ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 34126ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 3413f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 34141e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 34151e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 34161e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 3417f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 34184bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 3419f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 34204bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 3421f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 34224bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 3423475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 3424475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 3425475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 3426475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 3427f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 34289ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 3429f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 3430c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 3431c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 34327a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 3433f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 3434f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 3435f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 3436f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 3437ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 3438ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 3439ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 3440ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 3441d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 3442d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 3443d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 3444d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 34451406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 34461406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 3447f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 3448f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 3449f46b5a66SChristoph Hellwig return 0; 345046204592SSage Weil case BTRFS_IOC_START_SYNC: 345146204592SSage Weil return btrfs_ioctl_start_sync(file, argp); 345246204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 345346204592SSage Weil return btrfs_ioctl_wait_sync(file, argp); 3454475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 3455475f6387SJan Schmidt return btrfs_ioctl_scrub(root, argp); 3456475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 3457475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 3458475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 3459475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 3460c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 34619ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 3462837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 3463837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 346419a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 346519a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 3466c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 3467c11d2c23SStefan Behrens return btrfs_ioctl_get_dev_stats(root, argp, 0); 3468c11d2c23SStefan Behrens case BTRFS_IOC_GET_AND_RESET_DEV_STATS: 3469c11d2c23SStefan Behrens return btrfs_ioctl_get_dev_stats(root, argp, 1); 3470f46b5a66SChristoph Hellwig } 3471f46b5a66SChristoph Hellwig 3472f46b5a66SChristoph Hellwig return -ENOTTY; 3473f46b5a66SChristoph Hellwig } 3474