1f46b5a66SChristoph Hellwig /* 2f46b5a66SChristoph Hellwig * Copyright (C) 2007 Oracle. All rights reserved. 3f46b5a66SChristoph Hellwig * 4f46b5a66SChristoph Hellwig * This program is free software; you can redistribute it and/or 5f46b5a66SChristoph Hellwig * modify it under the terms of the GNU General Public 6f46b5a66SChristoph Hellwig * License v2 as published by the Free Software Foundation. 7f46b5a66SChristoph Hellwig * 8f46b5a66SChristoph Hellwig * This program is distributed in the hope that it will be useful, 9f46b5a66SChristoph Hellwig * but WITHOUT ANY WARRANTY; without even the implied warranty of 10f46b5a66SChristoph Hellwig * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11f46b5a66SChristoph Hellwig * General Public License for more details. 12f46b5a66SChristoph Hellwig * 13f46b5a66SChristoph Hellwig * You should have received a copy of the GNU General Public 14f46b5a66SChristoph Hellwig * License along with this program; if not, write to the 15f46b5a66SChristoph Hellwig * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16f46b5a66SChristoph Hellwig * Boston, MA 021110-1307, USA. 17f46b5a66SChristoph Hellwig */ 18f46b5a66SChristoph Hellwig 19f46b5a66SChristoph Hellwig #include <linux/kernel.h> 20f46b5a66SChristoph Hellwig #include <linux/bio.h> 21f46b5a66SChristoph Hellwig #include <linux/buffer_head.h> 22f46b5a66SChristoph Hellwig #include <linux/file.h> 23f46b5a66SChristoph Hellwig #include <linux/fs.h> 24cb8e7090SChristoph Hellwig #include <linux/fsnotify.h> 25f46b5a66SChristoph Hellwig #include <linux/pagemap.h> 26f46b5a66SChristoph Hellwig #include <linux/highmem.h> 27f46b5a66SChristoph Hellwig #include <linux/time.h> 28f46b5a66SChristoph Hellwig #include <linux/init.h> 29f46b5a66SChristoph Hellwig #include <linux/string.h> 30f46b5a66SChristoph Hellwig #include <linux/backing-dev.h> 31cb8e7090SChristoph Hellwig #include <linux/mount.h> 32f46b5a66SChristoph Hellwig #include <linux/mpage.h> 33cb8e7090SChristoph Hellwig #include <linux/namei.h> 34f46b5a66SChristoph Hellwig #include <linux/swap.h> 35f46b5a66SChristoph Hellwig #include <linux/writeback.h> 36f46b5a66SChristoph Hellwig #include <linux/statfs.h> 37f46b5a66SChristoph Hellwig #include <linux/compat.h> 38f46b5a66SChristoph Hellwig #include <linux/bit_spinlock.h> 39cb8e7090SChristoph Hellwig #include <linux/security.h> 40f46b5a66SChristoph Hellwig #include <linux/xattr.h> 417ea394f1SYan Zheng #include <linux/vmalloc.h> 425a0e3ad6STejun Heo #include <linux/slab.h> 43f7039b1dSLi Dongyang #include <linux/blkdev.h> 448ea05e3aSAlexander Block #include <linux/uuid.h> 454b4e25f2SChris Mason #include "compat.h" 46f46b5a66SChristoph Hellwig #include "ctree.h" 47f46b5a66SChristoph Hellwig #include "disk-io.h" 48f46b5a66SChristoph Hellwig #include "transaction.h" 49f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 50f46b5a66SChristoph Hellwig #include "ioctl.h" 51f46b5a66SChristoph Hellwig #include "print-tree.h" 52f46b5a66SChristoph Hellwig #include "volumes.h" 53925baeddSChris Mason #include "locking.h" 54581bb050SLi Zefan #include "inode-map.h" 55d7728c96SJan Schmidt #include "backref.h" 56606686eeSJosef Bacik #include "rcu-string.h" 57*31db9f7cSAlexander Block #include "send.h" 58f46b5a66SChristoph Hellwig 596cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 606cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 616cbff00fSChristoph Hellwig { 626cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 636cbff00fSChristoph Hellwig return flags; 646cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 656cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 666cbff00fSChristoph Hellwig else 676cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 686cbff00fSChristoph Hellwig } 69f46b5a66SChristoph Hellwig 706cbff00fSChristoph Hellwig /* 716cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 726cbff00fSChristoph Hellwig */ 736cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 746cbff00fSChristoph Hellwig { 756cbff00fSChristoph Hellwig unsigned int iflags = 0; 766cbff00fSChristoph Hellwig 776cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 786cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 796cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 806cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 816cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 826cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 836cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 846cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 856cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 866cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 876cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 886cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 89d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 90d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 91d0092bddSLi Zefan 92d0092bddSLi Zefan if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) 93d0092bddSLi Zefan iflags |= FS_COMPR_FL; 94d0092bddSLi Zefan else if (flags & BTRFS_INODE_NOCOMPRESS) 95d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 966cbff00fSChristoph Hellwig 976cbff00fSChristoph Hellwig return iflags; 986cbff00fSChristoph Hellwig } 996cbff00fSChristoph Hellwig 1006cbff00fSChristoph Hellwig /* 1016cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1026cbff00fSChristoph Hellwig */ 1036cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 1046cbff00fSChristoph Hellwig { 1056cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1066cbff00fSChristoph Hellwig 1076cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 1086cbff00fSChristoph Hellwig 1096cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 1106cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 1116cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1126cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1136cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1146cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1156cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1166cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1176cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1186cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1196cbff00fSChristoph Hellwig } 1206cbff00fSChristoph Hellwig 1216cbff00fSChristoph Hellwig /* 1226cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1236cbff00fSChristoph Hellwig * 124e27425d6SJosef Bacik * Currently only the compression flags and the cow flags are inherited. 1256cbff00fSChristoph Hellwig */ 1266cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1276cbff00fSChristoph Hellwig { 1280b4dcea5SChris Mason unsigned int flags; 1290b4dcea5SChris Mason 1300b4dcea5SChris Mason if (!dir) 1310b4dcea5SChris Mason return; 1320b4dcea5SChris Mason 1330b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1346cbff00fSChristoph Hellwig 135e27425d6SJosef Bacik if (flags & BTRFS_INODE_NOCOMPRESS) { 136e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; 137e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; 138e27425d6SJosef Bacik } else if (flags & BTRFS_INODE_COMPRESS) { 139e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; 140e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; 141e27425d6SJosef Bacik } 1426cbff00fSChristoph Hellwig 143e27425d6SJosef Bacik if (flags & BTRFS_INODE_NODATACOW) 144e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; 145e27425d6SJosef Bacik 1466cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1476cbff00fSChristoph Hellwig } 1486cbff00fSChristoph Hellwig 1496cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1506cbff00fSChristoph Hellwig { 1516cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); 1526cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1536cbff00fSChristoph Hellwig 1546cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1556cbff00fSChristoph Hellwig return -EFAULT; 1566cbff00fSChristoph Hellwig return 0; 1576cbff00fSChristoph Hellwig } 1586cbff00fSChristoph Hellwig 15975e7cb7fSLiu Bo static int check_flags(unsigned int flags) 16075e7cb7fSLiu Bo { 16175e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 16275e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 16375e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 164e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 165e1e8fb6aSLi Zefan FS_NOCOW_FL)) 16675e7cb7fSLiu Bo return -EOPNOTSUPP; 16775e7cb7fSLiu Bo 16875e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 16975e7cb7fSLiu Bo return -EINVAL; 17075e7cb7fSLiu Bo 17175e7cb7fSLiu Bo return 0; 17275e7cb7fSLiu Bo } 17375e7cb7fSLiu Bo 1746cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1756cbff00fSChristoph Hellwig { 1766cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 1776cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1786cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1796cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1806cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1816cbff00fSChristoph Hellwig int ret; 182f062abf0SLi Zefan u64 ip_oldflags; 183f062abf0SLi Zefan unsigned int i_oldflags; 1846cbff00fSChristoph Hellwig 185b83cc969SLi Zefan if (btrfs_root_readonly(root)) 186b83cc969SLi Zefan return -EROFS; 187b83cc969SLi Zefan 1886cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1896cbff00fSChristoph Hellwig return -EFAULT; 1906cbff00fSChristoph Hellwig 19175e7cb7fSLiu Bo ret = check_flags(flags); 19275e7cb7fSLiu Bo if (ret) 19375e7cb7fSLiu Bo return ret; 1946cbff00fSChristoph Hellwig 1952e149670SSerge E. Hallyn if (!inode_owner_or_capable(inode)) 1966cbff00fSChristoph Hellwig return -EACCES; 1976cbff00fSChristoph Hellwig 1986cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 1996cbff00fSChristoph Hellwig 200f062abf0SLi Zefan ip_oldflags = ip->flags; 201f062abf0SLi Zefan i_oldflags = inode->i_flags; 202f062abf0SLi Zefan 2036cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 2046cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 2056cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 2066cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 2076cbff00fSChristoph Hellwig ret = -EPERM; 2086cbff00fSChristoph Hellwig goto out_unlock; 2096cbff00fSChristoph Hellwig } 2106cbff00fSChristoph Hellwig } 2116cbff00fSChristoph Hellwig 212a561be71SAl Viro ret = mnt_want_write_file(file); 2136cbff00fSChristoph Hellwig if (ret) 2146cbff00fSChristoph Hellwig goto out_unlock; 2156cbff00fSChristoph Hellwig 2166cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 2176cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 2186cbff00fSChristoph Hellwig else 2196cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2206cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2216cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2226cbff00fSChristoph Hellwig else 2236cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2246cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2256cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2266cbff00fSChristoph Hellwig else 2276cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2286cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2296cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2306cbff00fSChristoph Hellwig else 2316cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2326cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2336cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2346cbff00fSChristoph Hellwig else 2356cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2366cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2376cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2386cbff00fSChristoph Hellwig else 2396cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 240e1e8fb6aSLi Zefan if (flags & FS_NOCOW_FL) 241e1e8fb6aSLi Zefan ip->flags |= BTRFS_INODE_NODATACOW; 242e1e8fb6aSLi Zefan else 243e1e8fb6aSLi Zefan ip->flags &= ~BTRFS_INODE_NODATACOW; 2446cbff00fSChristoph Hellwig 24575e7cb7fSLiu Bo /* 24675e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 24775e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 24875e7cb7fSLiu Bo * things smaller. 24975e7cb7fSLiu Bo */ 25075e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 25175e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 25275e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 25375e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 25475e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 25575e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 256ebcb904dSLi Zefan } else { 257ebcb904dSLi Zefan ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 25875e7cb7fSLiu Bo } 2596cbff00fSChristoph Hellwig 2604da6f1a3SLi Zefan trans = btrfs_start_transaction(root, 1); 261f062abf0SLi Zefan if (IS_ERR(trans)) { 262f062abf0SLi Zefan ret = PTR_ERR(trans); 263f062abf0SLi Zefan goto out_drop; 264f062abf0SLi Zefan } 2656cbff00fSChristoph Hellwig 266306424ccSLi Zefan btrfs_update_iflags(inode); 2670c4d2d95SJosef Bacik inode_inc_iversion(inode); 268306424ccSLi Zefan inode->i_ctime = CURRENT_TIME; 2696cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 2706cbff00fSChristoph Hellwig 2716cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 272f062abf0SLi Zefan out_drop: 273f062abf0SLi Zefan if (ret) { 274f062abf0SLi Zefan ip->flags = ip_oldflags; 275f062abf0SLi Zefan inode->i_flags = i_oldflags; 276f062abf0SLi Zefan } 2776cbff00fSChristoph Hellwig 2782a79f17eSAl Viro mnt_drop_write_file(file); 2796cbff00fSChristoph Hellwig out_unlock: 2806cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 2812d4e6f6aSliubo return ret; 2826cbff00fSChristoph Hellwig } 2836cbff00fSChristoph Hellwig 2846cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 2856cbff00fSChristoph Hellwig { 2866cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 2876cbff00fSChristoph Hellwig 2886cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 2896cbff00fSChristoph Hellwig } 290f46b5a66SChristoph Hellwig 291f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 292f7039b1dSLi Dongyang { 293815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(fdentry(file)->d_sb); 294f7039b1dSLi Dongyang struct btrfs_device *device; 295f7039b1dSLi Dongyang struct request_queue *q; 296f7039b1dSLi Dongyang struct fstrim_range range; 297f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 298f7039b1dSLi Dongyang u64 num_devices = 0; 299815745cfSAl Viro u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); 300f7039b1dSLi Dongyang int ret; 301f7039b1dSLi Dongyang 302f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 303f7039b1dSLi Dongyang return -EPERM; 304f7039b1dSLi Dongyang 3051f78160cSXiao Guangrong rcu_read_lock(); 3061f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 3071f78160cSXiao Guangrong dev_list) { 308f7039b1dSLi Dongyang if (!device->bdev) 309f7039b1dSLi Dongyang continue; 310f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 311f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 312f7039b1dSLi Dongyang num_devices++; 313f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 314f7039b1dSLi Dongyang minlen); 315f7039b1dSLi Dongyang } 316f7039b1dSLi Dongyang } 3171f78160cSXiao Guangrong rcu_read_unlock(); 318f4c697e6SLukas Czerner 319f7039b1dSLi Dongyang if (!num_devices) 320f7039b1dSLi Dongyang return -EOPNOTSUPP; 321f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 322f7039b1dSLi Dongyang return -EFAULT; 323f4c697e6SLukas Czerner if (range.start > total_bytes) 324f4c697e6SLukas Czerner return -EINVAL; 325f7039b1dSLi Dongyang 326f4c697e6SLukas Czerner range.len = min(range.len, total_bytes - range.start); 327f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 328815745cfSAl Viro ret = btrfs_trim_fs(fs_info->tree_root, &range); 329f7039b1dSLi Dongyang if (ret < 0) 330f7039b1dSLi Dongyang return ret; 331f7039b1dSLi Dongyang 332f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 333f7039b1dSLi Dongyang return -EFAULT; 334f7039b1dSLi Dongyang 335f7039b1dSLi Dongyang return 0; 336f7039b1dSLi Dongyang } 337f7039b1dSLi Dongyang 338cb8e7090SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, 339cb8e7090SChristoph Hellwig struct dentry *dentry, 34072fd032eSSage Weil char *name, int namelen, 34172fd032eSSage Weil u64 *async_transid) 342f46b5a66SChristoph Hellwig { 343f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 344f46b5a66SChristoph Hellwig struct btrfs_key key; 345f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 346f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 347f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 34876dda93cSYan, Zheng struct btrfs_root *new_root; 3492fbe8c8aSAl Viro struct dentry *parent = dentry->d_parent; 3506a912213SJosef Bacik struct inode *dir; 3518ea05e3aSAlexander Block struct timespec cur_time = CURRENT_TIME; 352f46b5a66SChristoph Hellwig int ret; 353f46b5a66SChristoph Hellwig int err; 354f46b5a66SChristoph Hellwig u64 objectid; 355f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 3563de4586cSChris Mason u64 index = 0; 3578ea05e3aSAlexander Block uuid_le new_uuid; 358f46b5a66SChristoph Hellwig 359581bb050SLi Zefan ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); 3602fbe8c8aSAl Viro if (ret) 361a22285a6SYan, Zheng return ret; 3626a912213SJosef Bacik 3636a912213SJosef Bacik dir = parent->d_inode; 3646a912213SJosef Bacik 3659ed74f2dSJosef Bacik /* 3669ed74f2dSJosef Bacik * 1 - inode item 3679ed74f2dSJosef Bacik * 2 - refs 3689ed74f2dSJosef Bacik * 1 - root item 3699ed74f2dSJosef Bacik * 2 - dir items 3709ed74f2dSJosef Bacik */ 371a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 6); 3722fbe8c8aSAl Viro if (IS_ERR(trans)) 373a22285a6SYan, Zheng return PTR_ERR(trans); 374f46b5a66SChristoph Hellwig 3755d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 3765581a51aSJan Schmidt 0, objectid, NULL, 0, 0, 0); 3778e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 3788e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 3798e8a1e31SJosef Bacik goto fail; 3808e8a1e31SJosef Bacik } 381f46b5a66SChristoph Hellwig 3825d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 383f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 384f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 3855d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 386f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 387f46b5a66SChristoph Hellwig 388f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 389f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 390f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 3915d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 3925d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 3935d4f98a2SYan Zheng BTRFS_UUID_SIZE); 394f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 395f46b5a66SChristoph Hellwig 3968ea05e3aSAlexander Block memset(&root_item, 0, sizeof(root_item)); 3978ea05e3aSAlexander Block 398f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 399f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 400f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 401f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 402a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 403f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 404f46b5a66SChristoph Hellwig 40508fe4db1SLi Zefan root_item.flags = 0; 40608fe4db1SLi Zefan root_item.byte_limit = 0; 40708fe4db1SLi Zefan inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT); 40808fe4db1SLi Zefan 409f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 41084234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 411f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 412f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 41386b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 41480ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 415f46b5a66SChristoph Hellwig 4168ea05e3aSAlexander Block btrfs_set_root_generation_v2(&root_item, 4178ea05e3aSAlexander Block btrfs_root_generation(&root_item)); 4188ea05e3aSAlexander Block uuid_le_gen(&new_uuid); 4198ea05e3aSAlexander Block memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); 4208ea05e3aSAlexander Block root_item.otime.sec = cpu_to_le64(cur_time.tv_sec); 4218ea05e3aSAlexander Block root_item.otime.nsec = cpu_to_le64(cur_time.tv_nsec); 4228ea05e3aSAlexander Block root_item.ctime = root_item.otime; 4238ea05e3aSAlexander Block btrfs_set_root_ctransid(&root_item, trans->transid); 4248ea05e3aSAlexander Block btrfs_set_root_otransid(&root_item, trans->transid); 425f46b5a66SChristoph Hellwig 426925baeddSChris Mason btrfs_tree_unlock(leaf); 427f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 428f46b5a66SChristoph Hellwig leaf = NULL; 429f46b5a66SChristoph Hellwig 430f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 431f46b5a66SChristoph Hellwig 432f46b5a66SChristoph Hellwig key.objectid = objectid; 4335d4f98a2SYan Zheng key.offset = 0; 434f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 435f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 436f46b5a66SChristoph Hellwig &root_item); 437f46b5a66SChristoph Hellwig if (ret) 438f46b5a66SChristoph Hellwig goto fail; 439f46b5a66SChristoph Hellwig 44076dda93cSYan, Zheng key.offset = (u64)-1; 44176dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 44279787eaaSJeff Mahoney if (IS_ERR(new_root)) { 44379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); 44479787eaaSJeff Mahoney ret = PTR_ERR(new_root); 44579787eaaSJeff Mahoney goto fail; 44679787eaaSJeff Mahoney } 44776dda93cSYan, Zheng 44876dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 44976dda93cSYan, Zheng 450d82a6f1dSJosef Bacik ret = btrfs_create_subvol_root(trans, new_root, new_dirid); 451ce598979SMark Fasheh if (ret) { 452ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 45379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 454ce598979SMark Fasheh goto fail; 455ce598979SMark Fasheh } 456ce598979SMark Fasheh 457f46b5a66SChristoph Hellwig /* 458f46b5a66SChristoph Hellwig * insert the directory item 459f46b5a66SChristoph Hellwig */ 4603de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 46179787eaaSJeff Mahoney if (ret) { 46279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 46379787eaaSJeff Mahoney goto fail; 46479787eaaSJeff Mahoney } 4653de4586cSChris Mason 4663de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 46716cdcec7SMiao Xie name, namelen, dir, &key, 4683de4586cSChris Mason BTRFS_FT_DIR, index); 46979787eaaSJeff Mahoney if (ret) { 47079787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 471f46b5a66SChristoph Hellwig goto fail; 47279787eaaSJeff Mahoney } 4730660b5afSChris Mason 47452c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 47552c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 47652c26179SYan Zheng BUG_ON(ret); 47752c26179SYan Zheng 4780660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 4794df27c4dSYan, Zheng objectid, root->root_key.objectid, 48033345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 48176dda93cSYan, Zheng 4820660b5afSChris Mason BUG_ON(ret); 4830660b5afSChris Mason 48476dda93cSYan, Zheng d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 485f46b5a66SChristoph Hellwig fail: 48672fd032eSSage Weil if (async_transid) { 48772fd032eSSage Weil *async_transid = trans->transid; 48872fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 48972fd032eSSage Weil } else { 49076dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 49172fd032eSSage Weil } 492f46b5a66SChristoph Hellwig if (err && !ret) 493f46b5a66SChristoph Hellwig ret = err; 494f46b5a66SChristoph Hellwig return ret; 495f46b5a66SChristoph Hellwig } 496f46b5a66SChristoph Hellwig 49772fd032eSSage Weil static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 498b83cc969SLi Zefan char *name, int namelen, u64 *async_transid, 499b83cc969SLi Zefan bool readonly) 500f46b5a66SChristoph Hellwig { 5012e4bfab9SYan, Zheng struct inode *inode; 502f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 503f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 5042e4bfab9SYan, Zheng int ret; 505f46b5a66SChristoph Hellwig 506f46b5a66SChristoph Hellwig if (!root->ref_cows) 507f46b5a66SChristoph Hellwig return -EINVAL; 508f46b5a66SChristoph Hellwig 509a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 510a22285a6SYan, Zheng if (!pending_snapshot) 511a22285a6SYan, Zheng return -ENOMEM; 512a22285a6SYan, Zheng 513a22285a6SYan, Zheng btrfs_init_block_rsv(&pending_snapshot->block_rsv); 514a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 515a22285a6SYan, Zheng pending_snapshot->root = root; 516b83cc969SLi Zefan pending_snapshot->readonly = readonly; 517a22285a6SYan, Zheng 518a22285a6SYan, Zheng trans = btrfs_start_transaction(root->fs_info->extent_root, 5); 519a22285a6SYan, Zheng if (IS_ERR(trans)) { 520a22285a6SYan, Zheng ret = PTR_ERR(trans); 521a22285a6SYan, Zheng goto fail; 522a22285a6SYan, Zheng } 523a22285a6SYan, Zheng 524a22285a6SYan, Zheng ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); 525a22285a6SYan, Zheng BUG_ON(ret); 526a22285a6SYan, Zheng 5278351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 528a22285a6SYan, Zheng list_add(&pending_snapshot->list, 529a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 5308351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 53172fd032eSSage Weil if (async_transid) { 53272fd032eSSage Weil *async_transid = trans->transid; 53372fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 53472fd032eSSage Weil root->fs_info->extent_root, 1); 53572fd032eSSage Weil } else { 53672fd032eSSage Weil ret = btrfs_commit_transaction(trans, 53772fd032eSSage Weil root->fs_info->extent_root); 53872fd032eSSage Weil } 539a22285a6SYan, Zheng BUG_ON(ret); 540a22285a6SYan, Zheng 541a22285a6SYan, Zheng ret = pending_snapshot->error; 542f46b5a66SChristoph Hellwig if (ret) 5432e4bfab9SYan, Zheng goto fail; 544f46b5a66SChristoph Hellwig 54566b4ffd1SJosef Bacik ret = btrfs_orphan_cleanup(pending_snapshot->snap); 54666b4ffd1SJosef Bacik if (ret) 54766b4ffd1SJosef Bacik goto fail; 548f46b5a66SChristoph Hellwig 5492fbe8c8aSAl Viro inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 5502e4bfab9SYan, Zheng if (IS_ERR(inode)) { 5512e4bfab9SYan, Zheng ret = PTR_ERR(inode); 5522e4bfab9SYan, Zheng goto fail; 5532e4bfab9SYan, Zheng } 5542e4bfab9SYan, Zheng BUG_ON(!inode); 5552e4bfab9SYan, Zheng d_instantiate(dentry, inode); 5562e4bfab9SYan, Zheng ret = 0; 5572e4bfab9SYan, Zheng fail: 558a22285a6SYan, Zheng kfree(pending_snapshot); 559f46b5a66SChristoph Hellwig return ret; 560f46b5a66SChristoph Hellwig } 561f46b5a66SChristoph Hellwig 5624260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 5634260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 5644260f7c7SSage Weil * minimal. 5654260f7c7SSage Weil */ 5664260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 5674260f7c7SSage Weil { 5684260f7c7SSage Weil uid_t fsuid = current_fsuid(); 5694260f7c7SSage Weil 5704260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 5714260f7c7SSage Weil return 0; 5724260f7c7SSage Weil if (inode->i_uid == fsuid) 5734260f7c7SSage Weil return 0; 5744260f7c7SSage Weil if (dir->i_uid == fsuid) 5754260f7c7SSage Weil return 0; 5764260f7c7SSage Weil return !capable(CAP_FOWNER); 5774260f7c7SSage Weil } 5784260f7c7SSage Weil 5794260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 5804260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 5814260f7c7SSage Weil * whether the type of victim is right. 5824260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 5834260f7c7SSage Weil * 2. We should have write and exec permissions on dir 5844260f7c7SSage Weil * 3. We can't remove anything from append-only dir 5854260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 5864260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 5874260f7c7SSage Weil * a. be owner of dir, or 5884260f7c7SSage Weil * b. be owner of victim, or 5894260f7c7SSage Weil * c. have CAP_FOWNER capability 5904260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 5914260f7c7SSage Weil * links pointing to it. 5924260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 5934260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 5944260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 5954260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 5964260f7c7SSage Weil * nfs_async_unlink(). 5974260f7c7SSage Weil */ 5984260f7c7SSage Weil 5994260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) 6004260f7c7SSage Weil { 6014260f7c7SSage Weil int error; 6024260f7c7SSage Weil 6034260f7c7SSage Weil if (!victim->d_inode) 6044260f7c7SSage Weil return -ENOENT; 6054260f7c7SSage Weil 6064260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 6074260f7c7SSage Weil audit_inode_child(victim, dir); 6084260f7c7SSage Weil 6094260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 6104260f7c7SSage Weil if (error) 6114260f7c7SSage Weil return error; 6124260f7c7SSage Weil if (IS_APPEND(dir)) 6134260f7c7SSage Weil return -EPERM; 6144260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 6154260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 6164260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 6174260f7c7SSage Weil return -EPERM; 6184260f7c7SSage Weil if (isdir) { 6194260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 6204260f7c7SSage Weil return -ENOTDIR; 6214260f7c7SSage Weil if (IS_ROOT(victim)) 6224260f7c7SSage Weil return -EBUSY; 6234260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 6244260f7c7SSage Weil return -EISDIR; 6254260f7c7SSage Weil if (IS_DEADDIR(dir)) 6264260f7c7SSage Weil return -ENOENT; 6274260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 6284260f7c7SSage Weil return -EBUSY; 6294260f7c7SSage Weil return 0; 6304260f7c7SSage Weil } 6314260f7c7SSage Weil 632cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 633cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 634cb8e7090SChristoph Hellwig { 635cb8e7090SChristoph Hellwig if (child->d_inode) 636cb8e7090SChristoph Hellwig return -EEXIST; 637cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 638cb8e7090SChristoph Hellwig return -ENOENT; 639cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 640cb8e7090SChristoph Hellwig } 641cb8e7090SChristoph Hellwig 642cb8e7090SChristoph Hellwig /* 643cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 644cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 645cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 646cb8e7090SChristoph Hellwig */ 64776dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 64876dda93cSYan, Zheng char *name, int namelen, 64972fd032eSSage Weil struct btrfs_root *snap_src, 650b83cc969SLi Zefan u64 *async_transid, bool readonly) 651cb8e7090SChristoph Hellwig { 65276dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 653cb8e7090SChristoph Hellwig struct dentry *dentry; 654cb8e7090SChristoph Hellwig int error; 655cb8e7090SChristoph Hellwig 65676dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 657cb8e7090SChristoph Hellwig 658cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 659cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 660cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 661cb8e7090SChristoph Hellwig goto out_unlock; 662cb8e7090SChristoph Hellwig 663cb8e7090SChristoph Hellwig error = -EEXIST; 664cb8e7090SChristoph Hellwig if (dentry->d_inode) 665cb8e7090SChristoph Hellwig goto out_dput; 666cb8e7090SChristoph Hellwig 667cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 668cb8e7090SChristoph Hellwig if (error) 669cb8e7090SChristoph Hellwig goto out_dput; 670cb8e7090SChristoph Hellwig 67176dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 672cb8e7090SChristoph Hellwig if (error) 673cb8e7090SChristoph Hellwig goto out_drop_write; 674cb8e7090SChristoph Hellwig 67576dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 67676dda93cSYan, Zheng 67776dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 67876dda93cSYan, Zheng goto out_up_read; 67976dda93cSYan, Zheng 6803de4586cSChris Mason if (snap_src) { 68172fd032eSSage Weil error = create_snapshot(snap_src, dentry, 682b83cc969SLi Zefan name, namelen, async_transid, readonly); 6833de4586cSChris Mason } else { 68476dda93cSYan, Zheng error = create_subvol(BTRFS_I(dir)->root, dentry, 68572fd032eSSage Weil name, namelen, async_transid); 6863de4586cSChris Mason } 68776dda93cSYan, Zheng if (!error) 68876dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 68976dda93cSYan, Zheng out_up_read: 69076dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 691cb8e7090SChristoph Hellwig out_drop_write: 692cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 693cb8e7090SChristoph Hellwig out_dput: 694cb8e7090SChristoph Hellwig dput(dentry); 695cb8e7090SChristoph Hellwig out_unlock: 69676dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 697cb8e7090SChristoph Hellwig return error; 698cb8e7090SChristoph Hellwig } 699cb8e7090SChristoph Hellwig 7004cb5300bSChris Mason /* 7014cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 7024cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 7034cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 7044cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 7054cb5300bSChris Mason * part of the file 7064cb5300bSChris Mason */ 7074cb5300bSChris Mason static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) 7084cb5300bSChris Mason { 7094cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 7104cb5300bSChris Mason struct extent_map *em = NULL; 7114cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 7124cb5300bSChris Mason u64 end; 7134cb5300bSChris Mason 7144cb5300bSChris Mason read_lock(&em_tree->lock); 7154cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 7164cb5300bSChris Mason read_unlock(&em_tree->lock); 7174cb5300bSChris Mason 7184cb5300bSChris Mason if (em) { 7194cb5300bSChris Mason end = extent_map_end(em); 7204cb5300bSChris Mason free_extent_map(em); 7214cb5300bSChris Mason if (end - offset > thresh) 7224cb5300bSChris Mason return 0; 7234cb5300bSChris Mason } 7244cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 7254cb5300bSChris Mason thresh /= 2; 7264cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 7274cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 7284cb5300bSChris Mason if (end >= thresh) 7294cb5300bSChris Mason return 0; 7304cb5300bSChris Mason return 1; 7314cb5300bSChris Mason } 7324cb5300bSChris Mason 7334cb5300bSChris Mason /* 7344cb5300bSChris Mason * helper function to walk through a file and find extents 7354cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 7364cb5300bSChris Mason * 7374cb5300bSChris Mason * This is used by the defragging code to find new and small 7384cb5300bSChris Mason * extents 7394cb5300bSChris Mason */ 7404cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 7414cb5300bSChris Mason struct inode *inode, u64 newer_than, 7424cb5300bSChris Mason u64 *off, int thresh) 7434cb5300bSChris Mason { 7444cb5300bSChris Mason struct btrfs_path *path; 7454cb5300bSChris Mason struct btrfs_key min_key; 7464cb5300bSChris Mason struct btrfs_key max_key; 7474cb5300bSChris Mason struct extent_buffer *leaf; 7484cb5300bSChris Mason struct btrfs_file_extent_item *extent; 7494cb5300bSChris Mason int type; 7504cb5300bSChris Mason int ret; 751a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 7524cb5300bSChris Mason 7534cb5300bSChris Mason path = btrfs_alloc_path(); 7544cb5300bSChris Mason if (!path) 7554cb5300bSChris Mason return -ENOMEM; 7564cb5300bSChris Mason 757a4689d2bSDavid Sterba min_key.objectid = ino; 7584cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 7594cb5300bSChris Mason min_key.offset = *off; 7604cb5300bSChris Mason 761a4689d2bSDavid Sterba max_key.objectid = ino; 7624cb5300bSChris Mason max_key.type = (u8)-1; 7634cb5300bSChris Mason max_key.offset = (u64)-1; 7644cb5300bSChris Mason 7654cb5300bSChris Mason path->keep_locks = 1; 7664cb5300bSChris Mason 7674cb5300bSChris Mason while(1) { 7684cb5300bSChris Mason ret = btrfs_search_forward(root, &min_key, &max_key, 7694cb5300bSChris Mason path, 0, newer_than); 7704cb5300bSChris Mason if (ret != 0) 7714cb5300bSChris Mason goto none; 772a4689d2bSDavid Sterba if (min_key.objectid != ino) 7734cb5300bSChris Mason goto none; 7744cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 7754cb5300bSChris Mason goto none; 7764cb5300bSChris Mason 7774cb5300bSChris Mason leaf = path->nodes[0]; 7784cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 7794cb5300bSChris Mason struct btrfs_file_extent_item); 7804cb5300bSChris Mason 7814cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 7824cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 7834cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 7844cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 7854cb5300bSChris Mason *off = min_key.offset; 7864cb5300bSChris Mason btrfs_free_path(path); 7874cb5300bSChris Mason return 0; 7884cb5300bSChris Mason } 7894cb5300bSChris Mason 7904cb5300bSChris Mason if (min_key.offset == (u64)-1) 7914cb5300bSChris Mason goto none; 7924cb5300bSChris Mason 7934cb5300bSChris Mason min_key.offset++; 7944cb5300bSChris Mason btrfs_release_path(path); 7954cb5300bSChris Mason } 7964cb5300bSChris Mason none: 7974cb5300bSChris Mason btrfs_free_path(path); 7984cb5300bSChris Mason return -ENOENT; 7994cb5300bSChris Mason } 8004cb5300bSChris Mason 8016c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 80217ce6ef8SLiu Bo { 80317ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 804940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8056c282eb4SLi Zefan struct extent_map *em; 8066c282eb4SLi Zefan u64 len = PAGE_CACHE_SIZE; 807940100a4SChris Mason 808940100a4SChris Mason /* 809940100a4SChris Mason * hopefully we have this extent in the tree already, try without 810940100a4SChris Mason * the full extent lock 811940100a4SChris Mason */ 812940100a4SChris Mason read_lock(&em_tree->lock); 813940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 814940100a4SChris Mason read_unlock(&em_tree->lock); 815940100a4SChris Mason 816940100a4SChris Mason if (!em) { 817940100a4SChris Mason /* get the big lock and read metadata off disk */ 818d0082371SJeff Mahoney lock_extent(io_tree, start, start + len - 1); 819940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 820d0082371SJeff Mahoney unlock_extent(io_tree, start, start + len - 1); 821940100a4SChris Mason 8226cf8bfbfSDan Carpenter if (IS_ERR(em)) 8236c282eb4SLi Zefan return NULL; 824940100a4SChris Mason } 825940100a4SChris Mason 8266c282eb4SLi Zefan return em; 8276c282eb4SLi Zefan } 8286c282eb4SLi Zefan 8296c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 8306c282eb4SLi Zefan { 8316c282eb4SLi Zefan struct extent_map *next; 8326c282eb4SLi Zefan bool ret = true; 8336c282eb4SLi Zefan 8346c282eb4SLi Zefan /* this is the last extent */ 8356c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 8366c282eb4SLi Zefan return false; 8376c282eb4SLi Zefan 8386c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 8396c282eb4SLi Zefan if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 8406c282eb4SLi Zefan ret = false; 8416c282eb4SLi Zefan 8426c282eb4SLi Zefan free_extent_map(next); 8436c282eb4SLi Zefan return ret; 8446c282eb4SLi Zefan } 8456c282eb4SLi Zefan 8466c282eb4SLi Zefan static int should_defrag_range(struct inode *inode, u64 start, int thresh, 8476c282eb4SLi Zefan u64 *last_len, u64 *skip, u64 *defrag_end) 8486c282eb4SLi Zefan { 8496c282eb4SLi Zefan struct extent_map *em; 8506c282eb4SLi Zefan int ret = 1; 8516c282eb4SLi Zefan bool next_mergeable = true; 8526c282eb4SLi Zefan 8536c282eb4SLi Zefan /* 8546c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 8556c282eb4SLi Zefan * defragging it 8566c282eb4SLi Zefan */ 8576c282eb4SLi Zefan if (start < *defrag_end) 8586c282eb4SLi Zefan return 1; 8596c282eb4SLi Zefan 8606c282eb4SLi Zefan *skip = 0; 8616c282eb4SLi Zefan 8626c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 8636c282eb4SLi Zefan if (!em) 8646c282eb4SLi Zefan return 0; 8656c282eb4SLi Zefan 866940100a4SChris Mason /* this will cover holes, and inline extents */ 86717ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 868940100a4SChris Mason ret = 0; 86917ce6ef8SLiu Bo goto out; 87017ce6ef8SLiu Bo } 87117ce6ef8SLiu Bo 8726c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 873940100a4SChris Mason 874940100a4SChris Mason /* 8756c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 8766c282eb4SLi Zefan * real extent, don't bother defragging it 877940100a4SChris Mason */ 8786c282eb4SLi Zefan if ((*last_len == 0 || *last_len >= thresh) && 8796c282eb4SLi Zefan (em->len >= thresh || !next_mergeable)) 880940100a4SChris Mason ret = 0; 88117ce6ef8SLiu Bo out: 882940100a4SChris Mason /* 883940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 884940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 885940100a4SChris Mason * so that the next tiny extent will force a defrag. 886940100a4SChris Mason * 887940100a4SChris Mason * The end result of this is that tiny extents before a single big 888940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 889940100a4SChris Mason */ 890940100a4SChris Mason if (ret) { 891940100a4SChris Mason *defrag_end = extent_map_end(em); 892940100a4SChris Mason } else { 893940100a4SChris Mason *last_len = 0; 894940100a4SChris Mason *skip = extent_map_end(em); 895940100a4SChris Mason *defrag_end = 0; 896940100a4SChris Mason } 897940100a4SChris Mason 898940100a4SChris Mason free_extent_map(em); 899940100a4SChris Mason return ret; 900940100a4SChris Mason } 901940100a4SChris Mason 9024cb5300bSChris Mason /* 9034cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 9044cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 9054cb5300bSChris Mason * to COW and defrag. 9064cb5300bSChris Mason * 9074cb5300bSChris Mason * It also makes sure the delalloc code has enough 9084cb5300bSChris Mason * dirty data to avoid making new small extents as part 9094cb5300bSChris Mason * of the defrag 9104cb5300bSChris Mason * 9114cb5300bSChris Mason * It's a good idea to start RA on this range 9124cb5300bSChris Mason * before calling this. 9134cb5300bSChris Mason */ 9144cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 9154cb5300bSChris Mason struct page **pages, 9164cb5300bSChris Mason unsigned long start_index, 9174cb5300bSChris Mason int num_pages) 918f46b5a66SChristoph Hellwig { 9194cb5300bSChris Mason unsigned long file_end; 9204cb5300bSChris Mason u64 isize = i_size_read(inode); 921f46b5a66SChristoph Hellwig u64 page_start; 922f46b5a66SChristoph Hellwig u64 page_end; 9231f12bd06SLiu Bo u64 page_cnt; 9244cb5300bSChris Mason int ret; 9254cb5300bSChris Mason int i; 9264cb5300bSChris Mason int i_done; 9274cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 9284cb5300bSChris Mason struct extent_state *cached_state = NULL; 929600a45e1SMiao Xie struct extent_io_tree *tree; 9303b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 9314cb5300bSChris Mason 9324cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 9331f12bd06SLiu Bo if (!isize || start_index > file_end) 9341f12bd06SLiu Bo return 0; 9351f12bd06SLiu Bo 9361f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 9374cb5300bSChris Mason 9384cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 9391f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 9404cb5300bSChris Mason if (ret) 9414cb5300bSChris Mason return ret; 9424cb5300bSChris Mason i_done = 0; 943600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 9444cb5300bSChris Mason 9454cb5300bSChris Mason /* step one, lock all the pages */ 9461f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 9474cb5300bSChris Mason struct page *page; 948600a45e1SMiao Xie again: 949a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 9503b16a4e3SJosef Bacik start_index + i, mask); 9514cb5300bSChris Mason if (!page) 9524cb5300bSChris Mason break; 9534cb5300bSChris Mason 954600a45e1SMiao Xie page_start = page_offset(page); 955600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 956600a45e1SMiao Xie while (1) { 957d0082371SJeff Mahoney lock_extent(tree, page_start, page_end); 958600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 959600a45e1SMiao Xie page_start); 960d0082371SJeff Mahoney unlock_extent(tree, page_start, page_end); 961600a45e1SMiao Xie if (!ordered) 962600a45e1SMiao Xie break; 963600a45e1SMiao Xie 964600a45e1SMiao Xie unlock_page(page); 965600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 966600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 967600a45e1SMiao Xie lock_page(page); 9681f12bd06SLiu Bo /* 9691f12bd06SLiu Bo * we unlocked the page above, so we need check if 9701f12bd06SLiu Bo * it was released or not. 9711f12bd06SLiu Bo */ 9721f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 9731f12bd06SLiu Bo unlock_page(page); 9741f12bd06SLiu Bo page_cache_release(page); 9751f12bd06SLiu Bo goto again; 9761f12bd06SLiu Bo } 977600a45e1SMiao Xie } 978600a45e1SMiao Xie 9794cb5300bSChris Mason if (!PageUptodate(page)) { 9804cb5300bSChris Mason btrfs_readpage(NULL, page); 9814cb5300bSChris Mason lock_page(page); 9824cb5300bSChris Mason if (!PageUptodate(page)) { 9834cb5300bSChris Mason unlock_page(page); 9844cb5300bSChris Mason page_cache_release(page); 9854cb5300bSChris Mason ret = -EIO; 9864cb5300bSChris Mason break; 9874cb5300bSChris Mason } 9884cb5300bSChris Mason } 989600a45e1SMiao Xie 990600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 991600a45e1SMiao Xie unlock_page(page); 992600a45e1SMiao Xie page_cache_release(page); 993600a45e1SMiao Xie goto again; 994600a45e1SMiao Xie } 995600a45e1SMiao Xie 9964cb5300bSChris Mason pages[i] = page; 9974cb5300bSChris Mason i_done++; 9984cb5300bSChris Mason } 9994cb5300bSChris Mason if (!i_done || ret) 10004cb5300bSChris Mason goto out; 10014cb5300bSChris Mason 10024cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 10034cb5300bSChris Mason goto out; 10044cb5300bSChris Mason 10054cb5300bSChris Mason /* 10064cb5300bSChris Mason * so now we have a nice long stream of locked 10074cb5300bSChris Mason * and up to date pages, lets wait on them 10084cb5300bSChris Mason */ 10094cb5300bSChris Mason for (i = 0; i < i_done; i++) 10104cb5300bSChris Mason wait_on_page_writeback(pages[i]); 10114cb5300bSChris Mason 10124cb5300bSChris Mason page_start = page_offset(pages[0]); 10134cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 10144cb5300bSChris Mason 10154cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1016d0082371SJeff Mahoney page_start, page_end - 1, 0, &cached_state); 10174cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 10184cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 10194cb5300bSChris Mason EXTENT_DO_ACCOUNTING, 0, 0, &cached_state, 10204cb5300bSChris Mason GFP_NOFS); 10214cb5300bSChris Mason 10221f12bd06SLiu Bo if (i_done != page_cnt) { 10239e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 10249e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 10259e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 10264cb5300bSChris Mason btrfs_delalloc_release_space(inode, 10271f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 10284cb5300bSChris Mason } 10294cb5300bSChris Mason 10304cb5300bSChris Mason 10314cb5300bSChris Mason btrfs_set_extent_delalloc(inode, page_start, page_end - 1, 10324cb5300bSChris Mason &cached_state); 10334cb5300bSChris Mason 10344cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 10354cb5300bSChris Mason page_start, page_end - 1, &cached_state, 10364cb5300bSChris Mason GFP_NOFS); 10374cb5300bSChris Mason 10384cb5300bSChris Mason for (i = 0; i < i_done; i++) { 10394cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 10404cb5300bSChris Mason ClearPageChecked(pages[i]); 10414cb5300bSChris Mason set_page_extent_mapped(pages[i]); 10424cb5300bSChris Mason set_page_dirty(pages[i]); 10434cb5300bSChris Mason unlock_page(pages[i]); 10444cb5300bSChris Mason page_cache_release(pages[i]); 10454cb5300bSChris Mason } 10464cb5300bSChris Mason return i_done; 10474cb5300bSChris Mason out: 10484cb5300bSChris Mason for (i = 0; i < i_done; i++) { 10494cb5300bSChris Mason unlock_page(pages[i]); 10504cb5300bSChris Mason page_cache_release(pages[i]); 10514cb5300bSChris Mason } 10521f12bd06SLiu Bo btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); 10534cb5300bSChris Mason return ret; 10544cb5300bSChris Mason 10554cb5300bSChris Mason } 10564cb5300bSChris Mason 10574cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 10584cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 10594cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 10604cb5300bSChris Mason { 10614cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 10624cb5300bSChris Mason struct btrfs_super_block *disk_super; 10634cb5300bSChris Mason struct file_ra_state *ra = NULL; 10644cb5300bSChris Mason unsigned long last_index; 1065151a31b2SLi Zefan u64 isize = i_size_read(inode); 10664cb5300bSChris Mason u64 features; 1067940100a4SChris Mason u64 last_len = 0; 1068940100a4SChris Mason u64 skip = 0; 1069940100a4SChris Mason u64 defrag_end = 0; 10704cb5300bSChris Mason u64 newer_off = range->start; 1071f46b5a66SChristoph Hellwig unsigned long i; 1072008873eaSLi Zefan unsigned long ra_index = 0; 1073f46b5a66SChristoph Hellwig int ret; 10744cb5300bSChris Mason int defrag_count = 0; 10751a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 10764cb5300bSChris Mason int extent_thresh = range->extent_thresh; 1077008873eaSLi Zefan int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; 1078008873eaSLi Zefan int cluster = max_cluster; 10794cb5300bSChris Mason u64 new_align = ~((u64)128 * 1024 - 1); 10804cb5300bSChris Mason struct page **pages = NULL; 10814cb5300bSChris Mason 10824cb5300bSChris Mason if (extent_thresh == 0) 10834cb5300bSChris Mason extent_thresh = 256 * 1024; 10841a419d85SLi Zefan 10851a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 10861a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 10871a419d85SLi Zefan return -EINVAL; 10881a419d85SLi Zefan if (range->compress_type) 10891a419d85SLi Zefan compress_type = range->compress_type; 10901a419d85SLi Zefan } 1091f46b5a66SChristoph Hellwig 1092151a31b2SLi Zefan if (isize == 0) 1093940100a4SChris Mason return 0; 1094f46b5a66SChristoph Hellwig 10954cb5300bSChris Mason /* 10964cb5300bSChris Mason * if we were not given a file, allocate a readahead 10974cb5300bSChris Mason * context 10984cb5300bSChris Mason */ 10994cb5300bSChris Mason if (!file) { 11004cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 11014cb5300bSChris Mason if (!ra) 11024cb5300bSChris Mason return -ENOMEM; 11034cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 11044cb5300bSChris Mason } else { 11054cb5300bSChris Mason ra = &file->f_ra; 11064cb5300bSChris Mason } 11074cb5300bSChris Mason 1108008873eaSLi Zefan pages = kmalloc(sizeof(struct page *) * max_cluster, 11094cb5300bSChris Mason GFP_NOFS); 11104cb5300bSChris Mason if (!pages) { 11114cb5300bSChris Mason ret = -ENOMEM; 11124cb5300bSChris Mason goto out_ra; 11134cb5300bSChris Mason } 11144cb5300bSChris Mason 11154cb5300bSChris Mason /* find the last page to defrag */ 11161e701a32SChris Mason if (range->start + range->len > range->start) { 1117151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 11181e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 11191e701a32SChris Mason } else { 1120151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 11211e701a32SChris Mason } 11221e701a32SChris Mason 11234cb5300bSChris Mason if (newer_than) { 11244cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 11254cb5300bSChris Mason &newer_off, 64 * 1024); 11264cb5300bSChris Mason if (!ret) { 11274cb5300bSChris Mason range->start = newer_off; 11284cb5300bSChris Mason /* 11294cb5300bSChris Mason * we always align our defrag to help keep 11304cb5300bSChris Mason * the extents in the file evenly spaced 11314cb5300bSChris Mason */ 11324cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 11334cb5300bSChris Mason } else 11344cb5300bSChris Mason goto out_ra; 11354cb5300bSChris Mason } else { 11361e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 11374cb5300bSChris Mason } 11384cb5300bSChris Mason if (!max_to_defrag) 11397ec31b54SLiu Bo max_to_defrag = last_index + 1; 11404cb5300bSChris Mason 11412a0f7f57SLi Zefan /* 11422a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 11432a0f7f57SLi Zefan * written sequentially. 11442a0f7f57SLi Zefan */ 11452a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 11462a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 11472a0f7f57SLi Zefan 1148f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1149f7f43cc8SChris Mason (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> 1150f7f43cc8SChris Mason PAGE_CACHE_SHIFT)) { 11514cb5300bSChris Mason /* 11524cb5300bSChris Mason * make sure we stop running if someone unmounts 11534cb5300bSChris Mason * the FS 11544cb5300bSChris Mason */ 11554cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 11564cb5300bSChris Mason break; 11574cb5300bSChris Mason 115866c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 11596c282eb4SLi Zefan extent_thresh, &last_len, &skip, 11606c282eb4SLi Zefan &defrag_end)) { 1161940100a4SChris Mason unsigned long next; 1162940100a4SChris Mason /* 1163940100a4SChris Mason * the should_defrag function tells us how much to skip 1164940100a4SChris Mason * bump our counter by the suggested amount 1165940100a4SChris Mason */ 1166940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 1167940100a4SChris Mason i = max(i + 1, next); 1168940100a4SChris Mason continue; 1169940100a4SChris Mason } 1170008873eaSLi Zefan 1171008873eaSLi Zefan if (!newer_than) { 1172008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1173008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1174008873eaSLi Zefan cluster = min(cluster, max_cluster); 1175008873eaSLi Zefan } else { 1176008873eaSLi Zefan cluster = max_cluster; 1177008873eaSLi Zefan } 1178008873eaSLi Zefan 11791e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 11801a419d85SLi Zefan BTRFS_I(inode)->force_compress = compress_type; 1181940100a4SChris Mason 1182008873eaSLi Zefan if (i + cluster > ra_index) { 1183008873eaSLi Zefan ra_index = max(i, ra_index); 1184008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1185008873eaSLi Zefan cluster); 1186008873eaSLi Zefan ra_index += max_cluster; 1187008873eaSLi Zefan } 11884cb5300bSChris Mason 1189ecb8bea8SLiu Bo mutex_lock(&inode->i_mutex); 1190008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1191ecb8bea8SLiu Bo if (ret < 0) { 1192ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 11934cb5300bSChris Mason goto out_ra; 1194ecb8bea8SLiu Bo } 11954cb5300bSChris Mason 11964cb5300bSChris Mason defrag_count += ret; 11974cb5300bSChris Mason balance_dirty_pages_ratelimited_nr(inode->i_mapping, ret); 1198ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 11994cb5300bSChris Mason 12004cb5300bSChris Mason if (newer_than) { 12014cb5300bSChris Mason if (newer_off == (u64)-1) 12024cb5300bSChris Mason break; 12034cb5300bSChris Mason 1204e1f041e1SLiu Bo if (ret > 0) 1205e1f041e1SLiu Bo i += ret; 1206e1f041e1SLiu Bo 12074cb5300bSChris Mason newer_off = max(newer_off + 1, 12084cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 12094cb5300bSChris Mason 12104cb5300bSChris Mason ret = find_new_extents(root, inode, 12114cb5300bSChris Mason newer_than, &newer_off, 12124cb5300bSChris Mason 64 * 1024); 12134cb5300bSChris Mason if (!ret) { 12144cb5300bSChris Mason range->start = newer_off; 12154cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 12164cb5300bSChris Mason } else { 12174cb5300bSChris Mason break; 1218940100a4SChris Mason } 12194cb5300bSChris Mason } else { 1220008873eaSLi Zefan if (ret > 0) { 1221cbcc8326SLi Zefan i += ret; 1222008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1223008873eaSLi Zefan } else { 1224940100a4SChris Mason i++; 1225008873eaSLi Zefan last_len = 0; 1226008873eaSLi Zefan } 1227f46b5a66SChristoph Hellwig } 12284cb5300bSChris Mason } 1229f46b5a66SChristoph Hellwig 12301e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 12311e701a32SChris Mason filemap_flush(inode->i_mapping); 12321e701a32SChris Mason 12331e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 12341e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 12351e701a32SChris Mason * we have to make sure the IO is actually started and that 12361e701a32SChris Mason * ordered extents get created before we return 12371e701a32SChris Mason */ 12381e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 12391e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 12401e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 12411e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 12421e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 12431e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 12441e701a32SChris Mason } 12451e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 12461e701a32SChris Mason 12471e701a32SChris Mason mutex_lock(&inode->i_mutex); 1248261507a0SLi Zefan BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 12491e701a32SChris Mason mutex_unlock(&inode->i_mutex); 12501e701a32SChris Mason } 12511e701a32SChris Mason 12526c41761fSDavid Sterba disk_super = root->fs_info->super_copy; 12531a419d85SLi Zefan features = btrfs_super_incompat_flags(disk_super); 12541a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 12551a419d85SLi Zefan features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; 12561a419d85SLi Zefan btrfs_set_super_incompat_flags(disk_super, features); 12571a419d85SLi Zefan } 12581a419d85SLi Zefan 125960ccf82fSDiego Calleja ret = defrag_count; 1260940100a4SChris Mason 12614cb5300bSChris Mason out_ra: 12624cb5300bSChris Mason if (!file) 12634cb5300bSChris Mason kfree(ra); 12644cb5300bSChris Mason kfree(pages); 1265940100a4SChris Mason return ret; 1266f46b5a66SChristoph Hellwig } 1267f46b5a66SChristoph Hellwig 126876dda93cSYan, Zheng static noinline int btrfs_ioctl_resize(struct btrfs_root *root, 126976dda93cSYan, Zheng void __user *arg) 1270f46b5a66SChristoph Hellwig { 1271f46b5a66SChristoph Hellwig u64 new_size; 1272f46b5a66SChristoph Hellwig u64 old_size; 1273f46b5a66SChristoph Hellwig u64 devid = 1; 1274f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1275f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1276f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1277f46b5a66SChristoph Hellwig char *sizestr; 1278f46b5a66SChristoph Hellwig char *devstr = NULL; 1279f46b5a66SChristoph Hellwig int ret = 0; 1280f46b5a66SChristoph Hellwig int mod = 0; 1281f46b5a66SChristoph Hellwig 1282c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1283c146afadSYan Zheng return -EROFS; 1284c146afadSYan Zheng 1285e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1286e441d54dSChris Mason return -EPERM; 1287e441d54dSChris Mason 1288c9e9f97bSIlya Dryomov mutex_lock(&root->fs_info->volume_mutex); 1289c9e9f97bSIlya Dryomov if (root->fs_info->balance_ctl) { 1290c9e9f97bSIlya Dryomov printk(KERN_INFO "btrfs: balance in progress\n"); 1291c9e9f97bSIlya Dryomov ret = -EINVAL; 1292c9e9f97bSIlya Dryomov goto out; 1293c9e9f97bSIlya Dryomov } 1294c9e9f97bSIlya Dryomov 1295dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1296c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1297c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1298c9e9f97bSIlya Dryomov goto out; 1299c9e9f97bSIlya Dryomov } 13005516e595SMark Fasheh 13015516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1302f46b5a66SChristoph Hellwig 1303f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1304f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1305f46b5a66SChristoph Hellwig if (devstr) { 1306f46b5a66SChristoph Hellwig char *end; 1307f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1308f46b5a66SChristoph Hellwig *devstr = '\0'; 1309f46b5a66SChristoph Hellwig devstr = vol_args->name; 1310f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 13115bb14682SArnd Hannemann printk(KERN_INFO "btrfs: resizing devid %llu\n", 131221380931SJoel Becker (unsigned long long)devid); 1313f46b5a66SChristoph Hellwig } 13142b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 1315f46b5a66SChristoph Hellwig if (!device) { 13165bb14682SArnd Hannemann printk(KERN_INFO "btrfs: resizer unable to find device %llu\n", 131721380931SJoel Becker (unsigned long long)devid); 1318f46b5a66SChristoph Hellwig ret = -EINVAL; 1319c9e9f97bSIlya Dryomov goto out_free; 1320f46b5a66SChristoph Hellwig } 13214e42ae1bSLiu Bo if (device->fs_devices && device->fs_devices->seeding) { 13224e42ae1bSLiu Bo printk(KERN_INFO "btrfs: resizer unable to apply on " 1323a8c4a33bSChris Mason "seeding device %llu\n", 1324a8c4a33bSChris Mason (unsigned long long)devid); 13254e42ae1bSLiu Bo ret = -EINVAL; 13264e42ae1bSLiu Bo goto out_free; 13274e42ae1bSLiu Bo } 13284e42ae1bSLiu Bo 1329f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1330f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1331f46b5a66SChristoph Hellwig else { 1332f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1333f46b5a66SChristoph Hellwig mod = -1; 1334f46b5a66SChristoph Hellwig sizestr++; 1335f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1336f46b5a66SChristoph Hellwig mod = 1; 1337f46b5a66SChristoph Hellwig sizestr++; 1338f46b5a66SChristoph Hellwig } 133991748467SAkinobu Mita new_size = memparse(sizestr, NULL); 1340f46b5a66SChristoph Hellwig if (new_size == 0) { 1341f46b5a66SChristoph Hellwig ret = -EINVAL; 1342c9e9f97bSIlya Dryomov goto out_free; 1343f46b5a66SChristoph Hellwig } 1344f46b5a66SChristoph Hellwig } 1345f46b5a66SChristoph Hellwig 1346f46b5a66SChristoph Hellwig old_size = device->total_bytes; 1347f46b5a66SChristoph Hellwig 1348f46b5a66SChristoph Hellwig if (mod < 0) { 1349f46b5a66SChristoph Hellwig if (new_size > old_size) { 1350f46b5a66SChristoph Hellwig ret = -EINVAL; 1351c9e9f97bSIlya Dryomov goto out_free; 1352f46b5a66SChristoph Hellwig } 1353f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1354f46b5a66SChristoph Hellwig } else if (mod > 0) { 1355f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1356f46b5a66SChristoph Hellwig } 1357f46b5a66SChristoph Hellwig 1358f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 1359f46b5a66SChristoph Hellwig ret = -EINVAL; 1360c9e9f97bSIlya Dryomov goto out_free; 1361f46b5a66SChristoph Hellwig } 1362f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1363f46b5a66SChristoph Hellwig ret = -EFBIG; 1364c9e9f97bSIlya Dryomov goto out_free; 1365f46b5a66SChristoph Hellwig } 1366f46b5a66SChristoph Hellwig 1367f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 1368f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1369f46b5a66SChristoph Hellwig 1370606686eeSJosef Bacik printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n", 1371606686eeSJosef Bacik rcu_str_deref(device->name), 1372606686eeSJosef Bacik (unsigned long long)new_size); 1373f46b5a66SChristoph Hellwig 1374f46b5a66SChristoph Hellwig if (new_size > old_size) { 1375a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 137698d5dc13STsutomu Itoh if (IS_ERR(trans)) { 137798d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1378c9e9f97bSIlya Dryomov goto out_free; 137998d5dc13STsutomu Itoh } 1380f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1381f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1382ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1383f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 1384f46b5a66SChristoph Hellwig } 1385f46b5a66SChristoph Hellwig 1386c9e9f97bSIlya Dryomov out_free: 1387f46b5a66SChristoph Hellwig kfree(vol_args); 1388c9e9f97bSIlya Dryomov out: 1389c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 1390f46b5a66SChristoph Hellwig return ret; 1391f46b5a66SChristoph Hellwig } 1392f46b5a66SChristoph Hellwig 139372fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 139472fd032eSSage Weil char *name, 139572fd032eSSage Weil unsigned long fd, 139672fd032eSSage Weil int subvol, 1397b83cc969SLi Zefan u64 *transid, 1398b83cc969SLi Zefan bool readonly) 1399f46b5a66SChristoph Hellwig { 1400cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 14013de4586cSChris Mason struct file *src_file; 1402f46b5a66SChristoph Hellwig int namelen; 14033de4586cSChris Mason int ret = 0; 1404f46b5a66SChristoph Hellwig 1405c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1406c146afadSYan Zheng return -EROFS; 1407c146afadSYan Zheng 140872fd032eSSage Weil namelen = strlen(name); 140972fd032eSSage Weil if (strchr(name, '/')) { 1410f46b5a66SChristoph Hellwig ret = -EINVAL; 1411f46b5a66SChristoph Hellwig goto out; 1412f46b5a66SChristoph Hellwig } 1413f46b5a66SChristoph Hellwig 141416780cabSChris Mason if (name[0] == '.' && 141516780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 141616780cabSChris Mason ret = -EEXIST; 141716780cabSChris Mason goto out; 141816780cabSChris Mason } 141916780cabSChris Mason 14203de4586cSChris Mason if (subvol) { 142172fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 1422b83cc969SLi Zefan NULL, transid, readonly); 1423cb8e7090SChristoph Hellwig } else { 14243de4586cSChris Mason struct inode *src_inode; 142572fd032eSSage Weil src_file = fget(fd); 14263de4586cSChris Mason if (!src_file) { 14273de4586cSChris Mason ret = -EINVAL; 14283de4586cSChris Mason goto out; 14293de4586cSChris Mason } 14303de4586cSChris Mason 14313de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 14323de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 1433d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 1434d397712bSChris Mason "another FS\n"); 14353de4586cSChris Mason ret = -EINVAL; 14363de4586cSChris Mason fput(src_file); 14373de4586cSChris Mason goto out; 14383de4586cSChris Mason } 143972fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 144072fd032eSSage Weil BTRFS_I(src_inode)->root, 1441b83cc969SLi Zefan transid, readonly); 14423de4586cSChris Mason fput(src_file); 1443cb8e7090SChristoph Hellwig } 1444f46b5a66SChristoph Hellwig out: 144572fd032eSSage Weil return ret; 144672fd032eSSage Weil } 144772fd032eSSage Weil 144872fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1449fa0d2b9bSLi Zefan void __user *arg, int subvol) 145072fd032eSSage Weil { 1451fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 145272fd032eSSage Weil int ret; 145372fd032eSSage Weil 1454fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1455fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1456fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1457fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1458fa0d2b9bSLi Zefan 1459fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1460b83cc969SLi Zefan vol_args->fd, subvol, 1461b83cc969SLi Zefan NULL, false); 1462fa0d2b9bSLi Zefan 1463fa0d2b9bSLi Zefan kfree(vol_args); 1464fa0d2b9bSLi Zefan return ret; 1465fa0d2b9bSLi Zefan } 1466fa0d2b9bSLi Zefan 1467fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1468fa0d2b9bSLi Zefan void __user *arg, int subvol) 1469fa0d2b9bSLi Zefan { 1470fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1471fa0d2b9bSLi Zefan int ret; 1472fdfb1e4fSLi Zefan u64 transid = 0; 1473fdfb1e4fSLi Zefan u64 *ptr = NULL; 1474b83cc969SLi Zefan bool readonly = false; 147572fd032eSSage Weil 1476fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1477fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1478fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1479fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1480fdfb1e4fSLi Zefan 1481b83cc969SLi Zefan if (vol_args->flags & 1482b83cc969SLi Zefan ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY)) { 1483b83cc969SLi Zefan ret = -EOPNOTSUPP; 1484fdfb1e4fSLi Zefan goto out; 1485fdfb1e4fSLi Zefan } 1486fdfb1e4fSLi Zefan 1487fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1488fdfb1e4fSLi Zefan ptr = &transid; 1489b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1490b83cc969SLi Zefan readonly = true; 149175eaa0e2SSage Weil 1492fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1493b83cc969SLi Zefan vol_args->fd, subvol, 1494b83cc969SLi Zefan ptr, readonly); 149575eaa0e2SSage Weil 1496fdfb1e4fSLi Zefan if (ret == 0 && ptr && 149775eaa0e2SSage Weil copy_to_user(arg + 1498fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1499fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 150075eaa0e2SSage Weil ret = -EFAULT; 1501fdfb1e4fSLi Zefan out: 1502f46b5a66SChristoph Hellwig kfree(vol_args); 1503f46b5a66SChristoph Hellwig return ret; 1504f46b5a66SChristoph Hellwig } 1505f46b5a66SChristoph Hellwig 15060caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 15070caa102dSLi Zefan void __user *arg) 15080caa102dSLi Zefan { 15090caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 15100caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 15110caa102dSLi Zefan int ret = 0; 15120caa102dSLi Zefan u64 flags = 0; 15130caa102dSLi Zefan 151433345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 15150caa102dSLi Zefan return -EINVAL; 15160caa102dSLi Zefan 15170caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 15180caa102dSLi Zefan if (btrfs_root_readonly(root)) 15190caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 15200caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 15210caa102dSLi Zefan 15220caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 15230caa102dSLi Zefan ret = -EFAULT; 15240caa102dSLi Zefan 15250caa102dSLi Zefan return ret; 15260caa102dSLi Zefan } 15270caa102dSLi Zefan 15280caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 15290caa102dSLi Zefan void __user *arg) 15300caa102dSLi Zefan { 15310caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 15320caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 15330caa102dSLi Zefan struct btrfs_trans_handle *trans; 15340caa102dSLi Zefan u64 root_flags; 15350caa102dSLi Zefan u64 flags; 15360caa102dSLi Zefan int ret = 0; 15370caa102dSLi Zefan 15380caa102dSLi Zefan if (root->fs_info->sb->s_flags & MS_RDONLY) 15390caa102dSLi Zefan return -EROFS; 15400caa102dSLi Zefan 154133345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 15420caa102dSLi Zefan return -EINVAL; 15430caa102dSLi Zefan 15440caa102dSLi Zefan if (copy_from_user(&flags, arg, sizeof(flags))) 15450caa102dSLi Zefan return -EFAULT; 15460caa102dSLi Zefan 1547b4dc2b8cSLi Zefan if (flags & BTRFS_SUBVOL_CREATE_ASYNC) 15480caa102dSLi Zefan return -EINVAL; 15490caa102dSLi Zefan 15500caa102dSLi Zefan if (flags & ~BTRFS_SUBVOL_RDONLY) 15510caa102dSLi Zefan return -EOPNOTSUPP; 15520caa102dSLi Zefan 15532e149670SSerge E. Hallyn if (!inode_owner_or_capable(inode)) 1554b4dc2b8cSLi Zefan return -EACCES; 1555b4dc2b8cSLi Zefan 15560caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 15570caa102dSLi Zefan 15580caa102dSLi Zefan /* nothing to do */ 15590caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 15600caa102dSLi Zefan goto out; 15610caa102dSLi Zefan 15620caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 15630caa102dSLi Zefan if (flags & BTRFS_SUBVOL_RDONLY) 15640caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 15650caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 15660caa102dSLi Zefan else 15670caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 15680caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 15690caa102dSLi Zefan 15700caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 15710caa102dSLi Zefan if (IS_ERR(trans)) { 15720caa102dSLi Zefan ret = PTR_ERR(trans); 15730caa102dSLi Zefan goto out_reset; 15740caa102dSLi Zefan } 15750caa102dSLi Zefan 1576b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 15770caa102dSLi Zefan &root->root_key, &root->root_item); 15780caa102dSLi Zefan 15790caa102dSLi Zefan btrfs_commit_transaction(trans, root); 15800caa102dSLi Zefan out_reset: 15810caa102dSLi Zefan if (ret) 15820caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 15830caa102dSLi Zefan out: 15840caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 15850caa102dSLi Zefan return ret; 15860caa102dSLi Zefan } 15870caa102dSLi Zefan 158876dda93cSYan, Zheng /* 158976dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 159076dda93cSYan, Zheng */ 159176dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 159276dda93cSYan, Zheng { 159376dda93cSYan, Zheng struct btrfs_path *path; 159476dda93cSYan, Zheng struct btrfs_key key; 159576dda93cSYan, Zheng int ret; 159676dda93cSYan, Zheng 159776dda93cSYan, Zheng path = btrfs_alloc_path(); 159876dda93cSYan, Zheng if (!path) 159976dda93cSYan, Zheng return -ENOMEM; 160076dda93cSYan, Zheng 160176dda93cSYan, Zheng key.objectid = root->root_key.objectid; 160276dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 160376dda93cSYan, Zheng key.offset = (u64)-1; 160476dda93cSYan, Zheng 160576dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 160676dda93cSYan, Zheng &key, path, 0, 0); 160776dda93cSYan, Zheng if (ret < 0) 160876dda93cSYan, Zheng goto out; 160976dda93cSYan, Zheng BUG_ON(ret == 0); 161076dda93cSYan, Zheng 161176dda93cSYan, Zheng ret = 0; 161276dda93cSYan, Zheng if (path->slots[0] > 0) { 161376dda93cSYan, Zheng path->slots[0]--; 161476dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 161576dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 161676dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 161776dda93cSYan, Zheng ret = -ENOTEMPTY; 161876dda93cSYan, Zheng } 161976dda93cSYan, Zheng out: 162076dda93cSYan, Zheng btrfs_free_path(path); 162176dda93cSYan, Zheng return ret; 162276dda93cSYan, Zheng } 162376dda93cSYan, Zheng 1624ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1625ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1626ac8e9819SChris Mason { 1627abc6e134SChris Mason struct btrfs_key test; 1628abc6e134SChris Mason int ret; 1629abc6e134SChris Mason 1630abc6e134SChris Mason test.objectid = sk->min_objectid; 1631abc6e134SChris Mason test.type = sk->min_type; 1632abc6e134SChris Mason test.offset = sk->min_offset; 1633abc6e134SChris Mason 1634abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1635abc6e134SChris Mason if (ret < 0) 1636ac8e9819SChris Mason return 0; 1637abc6e134SChris Mason 1638abc6e134SChris Mason test.objectid = sk->max_objectid; 1639abc6e134SChris Mason test.type = sk->max_type; 1640abc6e134SChris Mason test.offset = sk->max_offset; 1641abc6e134SChris Mason 1642abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1643abc6e134SChris Mason if (ret > 0) 1644ac8e9819SChris Mason return 0; 1645ac8e9819SChris Mason return 1; 1646ac8e9819SChris Mason } 1647ac8e9819SChris Mason 1648ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1649ac8e9819SChris Mason struct btrfs_path *path, 1650ac8e9819SChris Mason struct btrfs_key *key, 1651ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1652ac8e9819SChris Mason char *buf, 1653ac8e9819SChris Mason unsigned long *sk_offset, 1654ac8e9819SChris Mason int *num_found) 1655ac8e9819SChris Mason { 1656ac8e9819SChris Mason u64 found_transid; 1657ac8e9819SChris Mason struct extent_buffer *leaf; 1658ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1659ac8e9819SChris Mason unsigned long item_off; 1660ac8e9819SChris Mason unsigned long item_len; 1661ac8e9819SChris Mason int nritems; 1662ac8e9819SChris Mason int i; 1663ac8e9819SChris Mason int slot; 1664ac8e9819SChris Mason int ret = 0; 1665ac8e9819SChris Mason 1666ac8e9819SChris Mason leaf = path->nodes[0]; 1667ac8e9819SChris Mason slot = path->slots[0]; 1668ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1669ac8e9819SChris Mason 1670ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1671ac8e9819SChris Mason i = nritems; 1672ac8e9819SChris Mason goto advance_key; 1673ac8e9819SChris Mason } 1674ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1675ac8e9819SChris Mason 1676ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1677ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1678ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1679ac8e9819SChris Mason 1680ac8e9819SChris Mason if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1681ac8e9819SChris Mason item_len = 0; 1682ac8e9819SChris Mason 1683ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1684ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1685ac8e9819SChris Mason ret = 1; 1686ac8e9819SChris Mason goto overflow; 1687ac8e9819SChris Mason } 1688ac8e9819SChris Mason 1689ac8e9819SChris Mason btrfs_item_key_to_cpu(leaf, key, i); 1690ac8e9819SChris Mason if (!key_in_sk(key, sk)) 1691ac8e9819SChris Mason continue; 1692ac8e9819SChris Mason 1693ac8e9819SChris Mason sh.objectid = key->objectid; 1694ac8e9819SChris Mason sh.offset = key->offset; 1695ac8e9819SChris Mason sh.type = key->type; 1696ac8e9819SChris Mason sh.len = item_len; 1697ac8e9819SChris Mason sh.transid = found_transid; 1698ac8e9819SChris Mason 1699ac8e9819SChris Mason /* copy search result header */ 1700ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1701ac8e9819SChris Mason *sk_offset += sizeof(sh); 1702ac8e9819SChris Mason 1703ac8e9819SChris Mason if (item_len) { 1704ac8e9819SChris Mason char *p = buf + *sk_offset; 1705ac8e9819SChris Mason /* copy the item */ 1706ac8e9819SChris Mason read_extent_buffer(leaf, p, 1707ac8e9819SChris Mason item_off, item_len); 1708ac8e9819SChris Mason *sk_offset += item_len; 1709ac8e9819SChris Mason } 1710e2156867SHugo Mills (*num_found)++; 1711ac8e9819SChris Mason 1712ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1713ac8e9819SChris Mason break; 1714ac8e9819SChris Mason } 1715ac8e9819SChris Mason advance_key: 1716ac8e9819SChris Mason ret = 0; 1717abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1718abc6e134SChris Mason key->offset++; 1719abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1720abc6e134SChris Mason key->offset = 0; 1721abc6e134SChris Mason key->type++; 1722abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1723abc6e134SChris Mason key->offset = 0; 1724abc6e134SChris Mason key->type = 0; 1725abc6e134SChris Mason key->objectid++; 1726abc6e134SChris Mason } else 1727abc6e134SChris Mason ret = 1; 1728ac8e9819SChris Mason overflow: 1729ac8e9819SChris Mason return ret; 1730ac8e9819SChris Mason } 1731ac8e9819SChris Mason 1732ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1733ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1734ac8e9819SChris Mason { 1735ac8e9819SChris Mason struct btrfs_root *root; 1736ac8e9819SChris Mason struct btrfs_key key; 1737ac8e9819SChris Mason struct btrfs_key max_key; 1738ac8e9819SChris Mason struct btrfs_path *path; 1739ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1740ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1741ac8e9819SChris Mason int ret; 1742ac8e9819SChris Mason int num_found = 0; 1743ac8e9819SChris Mason unsigned long sk_offset = 0; 1744ac8e9819SChris Mason 1745ac8e9819SChris Mason path = btrfs_alloc_path(); 1746ac8e9819SChris Mason if (!path) 1747ac8e9819SChris Mason return -ENOMEM; 1748ac8e9819SChris Mason 1749ac8e9819SChris Mason if (sk->tree_id == 0) { 1750ac8e9819SChris Mason /* search the root of the inode that was passed */ 1751ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1752ac8e9819SChris Mason } else { 1753ac8e9819SChris Mason key.objectid = sk->tree_id; 1754ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1755ac8e9819SChris Mason key.offset = (u64)-1; 1756ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1757ac8e9819SChris Mason if (IS_ERR(root)) { 1758ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1759ac8e9819SChris Mason sk->tree_id); 1760ac8e9819SChris Mason btrfs_free_path(path); 1761ac8e9819SChris Mason return -ENOENT; 1762ac8e9819SChris Mason } 1763ac8e9819SChris Mason } 1764ac8e9819SChris Mason 1765ac8e9819SChris Mason key.objectid = sk->min_objectid; 1766ac8e9819SChris Mason key.type = sk->min_type; 1767ac8e9819SChris Mason key.offset = sk->min_offset; 1768ac8e9819SChris Mason 1769ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1770ac8e9819SChris Mason max_key.type = sk->max_type; 1771ac8e9819SChris Mason max_key.offset = sk->max_offset; 1772ac8e9819SChris Mason 1773ac8e9819SChris Mason path->keep_locks = 1; 1774ac8e9819SChris Mason 1775ac8e9819SChris Mason while(1) { 1776ac8e9819SChris Mason ret = btrfs_search_forward(root, &key, &max_key, path, 0, 1777ac8e9819SChris Mason sk->min_transid); 1778ac8e9819SChris Mason if (ret != 0) { 1779ac8e9819SChris Mason if (ret > 0) 1780ac8e9819SChris Mason ret = 0; 1781ac8e9819SChris Mason goto err; 1782ac8e9819SChris Mason } 1783ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1784ac8e9819SChris Mason &sk_offset, &num_found); 1785b3b4aa74SDavid Sterba btrfs_release_path(path); 1786ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1787ac8e9819SChris Mason break; 1788ac8e9819SChris Mason 1789ac8e9819SChris Mason } 1790ac8e9819SChris Mason ret = 0; 1791ac8e9819SChris Mason err: 1792ac8e9819SChris Mason sk->nr_items = num_found; 1793ac8e9819SChris Mason btrfs_free_path(path); 1794ac8e9819SChris Mason return ret; 1795ac8e9819SChris Mason } 1796ac8e9819SChris Mason 1797ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1798ac8e9819SChris Mason void __user *argp) 1799ac8e9819SChris Mason { 1800ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1801ac8e9819SChris Mason struct inode *inode; 1802ac8e9819SChris Mason int ret; 1803ac8e9819SChris Mason 1804ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1805ac8e9819SChris Mason return -EPERM; 1806ac8e9819SChris Mason 18072354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 18082354d08fSJulia Lawall if (IS_ERR(args)) 18092354d08fSJulia Lawall return PTR_ERR(args); 1810ac8e9819SChris Mason 1811ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1812ac8e9819SChris Mason ret = search_ioctl(inode, args); 1813ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1814ac8e9819SChris Mason ret = -EFAULT; 1815ac8e9819SChris Mason kfree(args); 1816ac8e9819SChris Mason return ret; 1817ac8e9819SChris Mason } 1818ac8e9819SChris Mason 181998d377a0STARUISI Hiroaki /* 1820ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1821ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 182298d377a0STARUISI Hiroaki */ 182398d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 182498d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 182598d377a0STARUISI Hiroaki { 182698d377a0STARUISI Hiroaki struct btrfs_root *root; 182798d377a0STARUISI Hiroaki struct btrfs_key key; 1828ac8e9819SChris Mason char *ptr; 182998d377a0STARUISI Hiroaki int ret = -1; 183098d377a0STARUISI Hiroaki int slot; 183198d377a0STARUISI Hiroaki int len; 183298d377a0STARUISI Hiroaki int total_len = 0; 183398d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 183498d377a0STARUISI Hiroaki struct extent_buffer *l; 183598d377a0STARUISI Hiroaki struct btrfs_path *path; 183698d377a0STARUISI Hiroaki 183798d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 183898d377a0STARUISI Hiroaki name[0]='\0'; 183998d377a0STARUISI Hiroaki return 0; 184098d377a0STARUISI Hiroaki } 184198d377a0STARUISI Hiroaki 184298d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 184398d377a0STARUISI Hiroaki if (!path) 184498d377a0STARUISI Hiroaki return -ENOMEM; 184598d377a0STARUISI Hiroaki 1846ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 184798d377a0STARUISI Hiroaki 184898d377a0STARUISI Hiroaki key.objectid = tree_id; 184998d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 185098d377a0STARUISI Hiroaki key.offset = (u64)-1; 185198d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 185298d377a0STARUISI Hiroaki if (IS_ERR(root)) { 185398d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 18548ad6fcabSChris Mason ret = -ENOENT; 18558ad6fcabSChris Mason goto out; 185698d377a0STARUISI Hiroaki } 185798d377a0STARUISI Hiroaki 185898d377a0STARUISI Hiroaki key.objectid = dirid; 185998d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 18608ad6fcabSChris Mason key.offset = (u64)-1; 186198d377a0STARUISI Hiroaki 186298d377a0STARUISI Hiroaki while(1) { 186398d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 186498d377a0STARUISI Hiroaki if (ret < 0) 186598d377a0STARUISI Hiroaki goto out; 186698d377a0STARUISI Hiroaki 186798d377a0STARUISI Hiroaki l = path->nodes[0]; 186898d377a0STARUISI Hiroaki slot = path->slots[0]; 18698ad6fcabSChris Mason if (ret > 0 && slot > 0) 18708ad6fcabSChris Mason slot--; 187198d377a0STARUISI Hiroaki btrfs_item_key_to_cpu(l, &key, slot); 187298d377a0STARUISI Hiroaki 187398d377a0STARUISI Hiroaki if (ret > 0 && (key.objectid != dirid || 1874ac8e9819SChris Mason key.type != BTRFS_INODE_REF_KEY)) { 1875ac8e9819SChris Mason ret = -ENOENT; 187698d377a0STARUISI Hiroaki goto out; 1877ac8e9819SChris Mason } 187898d377a0STARUISI Hiroaki 187998d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 188098d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 188198d377a0STARUISI Hiroaki ptr -= len + 1; 188298d377a0STARUISI Hiroaki total_len += len + 1; 1883ac8e9819SChris Mason if (ptr < name) 188498d377a0STARUISI Hiroaki goto out; 188598d377a0STARUISI Hiroaki 188698d377a0STARUISI Hiroaki *(ptr + len) = '/'; 188798d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 188898d377a0STARUISI Hiroaki 188998d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 189098d377a0STARUISI Hiroaki break; 189198d377a0STARUISI Hiroaki 1892b3b4aa74SDavid Sterba btrfs_release_path(path); 189398d377a0STARUISI Hiroaki key.objectid = key.offset; 18948ad6fcabSChris Mason key.offset = (u64)-1; 189598d377a0STARUISI Hiroaki dirid = key.objectid; 189698d377a0STARUISI Hiroaki } 1897ac8e9819SChris Mason if (ptr < name) 189898d377a0STARUISI Hiroaki goto out; 189977906a50SLi Zefan memmove(name, ptr, total_len); 190098d377a0STARUISI Hiroaki name[total_len]='\0'; 190198d377a0STARUISI Hiroaki ret = 0; 190298d377a0STARUISI Hiroaki out: 190398d377a0STARUISI Hiroaki btrfs_free_path(path); 1904ac8e9819SChris Mason return ret; 1905ac8e9819SChris Mason } 1906ac8e9819SChris Mason 1907ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 1908ac8e9819SChris Mason void __user *argp) 1909ac8e9819SChris Mason { 1910ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 1911ac8e9819SChris Mason struct inode *inode; 1912ac8e9819SChris Mason int ret; 1913ac8e9819SChris Mason 1914ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1915ac8e9819SChris Mason return -EPERM; 1916ac8e9819SChris Mason 19172354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 19182354d08fSJulia Lawall if (IS_ERR(args)) 19192354d08fSJulia Lawall return PTR_ERR(args); 1920c2b96929SDan Carpenter 1921ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1922ac8e9819SChris Mason 19231b53ac4dSChris Mason if (args->treeid == 0) 19241b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 19251b53ac4dSChris Mason 1926ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 1927ac8e9819SChris Mason args->treeid, args->objectid, 1928ac8e9819SChris Mason args->name); 1929ac8e9819SChris Mason 1930ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1931ac8e9819SChris Mason ret = -EFAULT; 1932ac8e9819SChris Mason 1933ac8e9819SChris Mason kfree(args); 193498d377a0STARUISI Hiroaki return ret; 193598d377a0STARUISI Hiroaki } 193698d377a0STARUISI Hiroaki 193776dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 193876dda93cSYan, Zheng void __user *arg) 193976dda93cSYan, Zheng { 194076dda93cSYan, Zheng struct dentry *parent = fdentry(file); 194176dda93cSYan, Zheng struct dentry *dentry; 194276dda93cSYan, Zheng struct inode *dir = parent->d_inode; 194376dda93cSYan, Zheng struct inode *inode; 194476dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 194576dda93cSYan, Zheng struct btrfs_root *dest = NULL; 194676dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 194776dda93cSYan, Zheng struct btrfs_trans_handle *trans; 194876dda93cSYan, Zheng int namelen; 194976dda93cSYan, Zheng int ret; 195076dda93cSYan, Zheng int err = 0; 195176dda93cSYan, Zheng 195276dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 195376dda93cSYan, Zheng if (IS_ERR(vol_args)) 195476dda93cSYan, Zheng return PTR_ERR(vol_args); 195576dda93cSYan, Zheng 195676dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 195776dda93cSYan, Zheng namelen = strlen(vol_args->name); 195876dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 195976dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 196076dda93cSYan, Zheng err = -EINVAL; 196176dda93cSYan, Zheng goto out; 196276dda93cSYan, Zheng } 196376dda93cSYan, Zheng 1964a561be71SAl Viro err = mnt_want_write_file(file); 196576dda93cSYan, Zheng if (err) 196676dda93cSYan, Zheng goto out; 196776dda93cSYan, Zheng 196876dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 196976dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 197076dda93cSYan, Zheng if (IS_ERR(dentry)) { 197176dda93cSYan, Zheng err = PTR_ERR(dentry); 197276dda93cSYan, Zheng goto out_unlock_dir; 197376dda93cSYan, Zheng } 197476dda93cSYan, Zheng 197576dda93cSYan, Zheng if (!dentry->d_inode) { 197676dda93cSYan, Zheng err = -ENOENT; 197776dda93cSYan, Zheng goto out_dput; 197876dda93cSYan, Zheng } 197976dda93cSYan, Zheng 198076dda93cSYan, Zheng inode = dentry->d_inode; 19814260f7c7SSage Weil dest = BTRFS_I(inode)->root; 19824260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)){ 19834260f7c7SSage Weil /* 19844260f7c7SSage Weil * Regular user. Only allow this with a special mount 19854260f7c7SSage Weil * option, when the user has write+exec access to the 19864260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 19874260f7c7SSage Weil * allowed. 19884260f7c7SSage Weil * 19894260f7c7SSage Weil * Note that this is _not_ check that the subvol is 19904260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 19914260f7c7SSage Weil * otherwise be able to delete. 19924260f7c7SSage Weil * 19934260f7c7SSage Weil * Users who want to delete empty subvols should try 19944260f7c7SSage Weil * rmdir(2). 19954260f7c7SSage Weil */ 19964260f7c7SSage Weil err = -EPERM; 19974260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 19984260f7c7SSage Weil goto out_dput; 19994260f7c7SSage Weil 20004260f7c7SSage Weil /* 20014260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 20024260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 20034260f7c7SSage Weil * must be called on the dentry referencing the root 20044260f7c7SSage Weil * of the subvol, not a random directory contained 20054260f7c7SSage Weil * within it. 20064260f7c7SSage Weil */ 20074260f7c7SSage Weil err = -EINVAL; 20084260f7c7SSage Weil if (root == dest) 20094260f7c7SSage Weil goto out_dput; 20104260f7c7SSage Weil 20114260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 20124260f7c7SSage Weil if (err) 20134260f7c7SSage Weil goto out_dput; 20144260f7c7SSage Weil 20154260f7c7SSage Weil /* check if subvolume may be deleted by a non-root user */ 20164260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 20174260f7c7SSage Weil if (err) 20184260f7c7SSage Weil goto out_dput; 20194260f7c7SSage Weil } 20204260f7c7SSage Weil 202133345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 202276dda93cSYan, Zheng err = -EINVAL; 202376dda93cSYan, Zheng goto out_dput; 202476dda93cSYan, Zheng } 202576dda93cSYan, Zheng 202676dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 202776dda93cSYan, Zheng err = d_invalidate(dentry); 202876dda93cSYan, Zheng if (err) 202976dda93cSYan, Zheng goto out_unlock; 203076dda93cSYan, Zheng 203176dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 203276dda93cSYan, Zheng 203376dda93cSYan, Zheng err = may_destroy_subvol(dest); 203476dda93cSYan, Zheng if (err) 203576dda93cSYan, Zheng goto out_up_write; 203676dda93cSYan, Zheng 2037a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2038a22285a6SYan, Zheng if (IS_ERR(trans)) { 2039a22285a6SYan, Zheng err = PTR_ERR(trans); 2040d327099aSDan Carpenter goto out_up_write; 2041a22285a6SYan, Zheng } 2042a22285a6SYan, Zheng trans->block_rsv = &root->fs_info->global_block_rsv; 2043a22285a6SYan, Zheng 204476dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 204576dda93cSYan, Zheng dest->root_key.objectid, 204676dda93cSYan, Zheng dentry->d_name.name, 204776dda93cSYan, Zheng dentry->d_name.len); 204879787eaaSJeff Mahoney if (ret) { 204979787eaaSJeff Mahoney err = ret; 205079787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 205179787eaaSJeff Mahoney goto out_end_trans; 205279787eaaSJeff Mahoney } 205376dda93cSYan, Zheng 205476dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 205576dda93cSYan, Zheng 205676dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 205776dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 205876dda93cSYan, Zheng dest->root_item.drop_level = 0; 205976dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 206076dda93cSYan, Zheng 2061d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 206276dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 206376dda93cSYan, Zheng root->fs_info->tree_root, 206476dda93cSYan, Zheng dest->root_key.objectid); 206579787eaaSJeff Mahoney if (ret) { 206679787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 206779787eaaSJeff Mahoney err = ret; 206879787eaaSJeff Mahoney goto out_end_trans; 2069d68fc57bSYan, Zheng } 207079787eaaSJeff Mahoney } 207179787eaaSJeff Mahoney out_end_trans: 2072531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 207379787eaaSJeff Mahoney if (ret && !err) 207479787eaaSJeff Mahoney err = ret; 207576dda93cSYan, Zheng inode->i_flags |= S_DEAD; 207676dda93cSYan, Zheng out_up_write: 207776dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 207876dda93cSYan, Zheng out_unlock: 207976dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 208076dda93cSYan, Zheng if (!err) { 2081efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 208276dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 208376dda93cSYan, Zheng d_delete(dentry); 208476dda93cSYan, Zheng } 208576dda93cSYan, Zheng out_dput: 208676dda93cSYan, Zheng dput(dentry); 208776dda93cSYan, Zheng out_unlock_dir: 208876dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 20892a79f17eSAl Viro mnt_drop_write_file(file); 209076dda93cSYan, Zheng out: 209176dda93cSYan, Zheng kfree(vol_args); 209276dda93cSYan, Zheng return err; 209376dda93cSYan, Zheng } 209476dda93cSYan, Zheng 20951e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2096f46b5a66SChristoph Hellwig { 2097f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2098f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 20991e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2100c146afadSYan Zheng int ret; 2101c146afadSYan Zheng 2102b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2103b83cc969SLi Zefan return -EROFS; 2104b83cc969SLi Zefan 2105a561be71SAl Viro ret = mnt_want_write_file(file); 2106c146afadSYan Zheng if (ret) 2107c146afadSYan Zheng return ret; 2108f46b5a66SChristoph Hellwig 2109f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2110f46b5a66SChristoph Hellwig case S_IFDIR: 2111e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2112e441d54dSChris Mason ret = -EPERM; 2113e441d54dSChris Mason goto out; 2114e441d54dSChris Mason } 21158929ecfaSYan, Zheng ret = btrfs_defrag_root(root, 0); 21168929ecfaSYan, Zheng if (ret) 21178929ecfaSYan, Zheng goto out; 21188929ecfaSYan, Zheng ret = btrfs_defrag_root(root->fs_info->extent_root, 0); 2119f46b5a66SChristoph Hellwig break; 2120f46b5a66SChristoph Hellwig case S_IFREG: 2121e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2122e441d54dSChris Mason ret = -EINVAL; 2123e441d54dSChris Mason goto out; 2124e441d54dSChris Mason } 21251e701a32SChris Mason 21261e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 21271e701a32SChris Mason if (!range) { 21281e701a32SChris Mason ret = -ENOMEM; 21291e701a32SChris Mason goto out; 21301e701a32SChris Mason } 21311e701a32SChris Mason 21321e701a32SChris Mason if (argp) { 21331e701a32SChris Mason if (copy_from_user(range, argp, 21341e701a32SChris Mason sizeof(*range))) { 21351e701a32SChris Mason ret = -EFAULT; 21361e701a32SChris Mason kfree(range); 2137683be16eSDan Carpenter goto out; 21381e701a32SChris Mason } 21391e701a32SChris Mason /* compression requires us to start the IO */ 21401e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 21411e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 21421e701a32SChris Mason range->extent_thresh = (u32)-1; 21431e701a32SChris Mason } 21441e701a32SChris Mason } else { 21451e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 21461e701a32SChris Mason range->len = (u64)-1; 21471e701a32SChris Mason } 21484cb5300bSChris Mason ret = btrfs_defrag_file(fdentry(file)->d_inode, file, 21494cb5300bSChris Mason range, 0, 0); 21504cb5300bSChris Mason if (ret > 0) 21514cb5300bSChris Mason ret = 0; 21521e701a32SChris Mason kfree(range); 2153f46b5a66SChristoph Hellwig break; 21548929ecfaSYan, Zheng default: 21558929ecfaSYan, Zheng ret = -EINVAL; 2156f46b5a66SChristoph Hellwig } 2157e441d54dSChris Mason out: 21582a79f17eSAl Viro mnt_drop_write_file(file); 2159e441d54dSChris Mason return ret; 2160f46b5a66SChristoph Hellwig } 2161f46b5a66SChristoph Hellwig 2162b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2163f46b5a66SChristoph Hellwig { 2164f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2165f46b5a66SChristoph Hellwig int ret; 2166f46b5a66SChristoph Hellwig 2167e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2168e441d54dSChris Mason return -EPERM; 2169e441d54dSChris Mason 2170c9e9f97bSIlya Dryomov mutex_lock(&root->fs_info->volume_mutex); 2171c9e9f97bSIlya Dryomov if (root->fs_info->balance_ctl) { 2172c9e9f97bSIlya Dryomov printk(KERN_INFO "btrfs: balance in progress\n"); 2173c9e9f97bSIlya Dryomov ret = -EINVAL; 2174c9e9f97bSIlya Dryomov goto out; 2175c9e9f97bSIlya Dryomov } 2176c9e9f97bSIlya Dryomov 2177dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2178c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2179c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2180c9e9f97bSIlya Dryomov goto out; 2181c9e9f97bSIlya Dryomov } 2182f46b5a66SChristoph Hellwig 21835516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2184f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2185f46b5a66SChristoph Hellwig 2186f46b5a66SChristoph Hellwig kfree(vol_args); 2187c9e9f97bSIlya Dryomov out: 2188c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 2189f46b5a66SChristoph Hellwig return ret; 2190f46b5a66SChristoph Hellwig } 2191f46b5a66SChristoph Hellwig 2192b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 2193f46b5a66SChristoph Hellwig { 2194f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2195f46b5a66SChristoph Hellwig int ret; 2196f46b5a66SChristoph Hellwig 2197e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2198e441d54dSChris Mason return -EPERM; 2199e441d54dSChris Mason 2200c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 2201c146afadSYan Zheng return -EROFS; 2202c146afadSYan Zheng 2203c9e9f97bSIlya Dryomov mutex_lock(&root->fs_info->volume_mutex); 2204c9e9f97bSIlya Dryomov if (root->fs_info->balance_ctl) { 2205c9e9f97bSIlya Dryomov printk(KERN_INFO "btrfs: balance in progress\n"); 2206c9e9f97bSIlya Dryomov ret = -EINVAL; 2207c9e9f97bSIlya Dryomov goto out; 2208c9e9f97bSIlya Dryomov } 2209c9e9f97bSIlya Dryomov 2210dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2211c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2212c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2213c9e9f97bSIlya Dryomov goto out; 2214c9e9f97bSIlya Dryomov } 2215f46b5a66SChristoph Hellwig 22165516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2217f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 2218f46b5a66SChristoph Hellwig 2219f46b5a66SChristoph Hellwig kfree(vol_args); 2220c9e9f97bSIlya Dryomov out: 2221c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 2222f46b5a66SChristoph Hellwig return ret; 2223f46b5a66SChristoph Hellwig } 2224f46b5a66SChristoph Hellwig 2225475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2226475f6387SJan Schmidt { 2227027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2228475f6387SJan Schmidt struct btrfs_device *device; 2229475f6387SJan Schmidt struct btrfs_device *next; 2230475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2231027ed2f0SLi Zefan int ret = 0; 2232475f6387SJan Schmidt 2233475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2234475f6387SJan Schmidt return -EPERM; 2235475f6387SJan Schmidt 2236027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2237027ed2f0SLi Zefan if (!fi_args) 2238027ed2f0SLi Zefan return -ENOMEM; 2239027ed2f0SLi Zefan 2240027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2241027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2242475f6387SJan Schmidt 2243475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2244475f6387SJan Schmidt list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { 2245027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2246027ed2f0SLi Zefan fi_args->max_id = device->devid; 2247475f6387SJan Schmidt } 2248475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2249475f6387SJan Schmidt 2250027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2251027ed2f0SLi Zefan ret = -EFAULT; 2252475f6387SJan Schmidt 2253027ed2f0SLi Zefan kfree(fi_args); 2254027ed2f0SLi Zefan return ret; 2255475f6387SJan Schmidt } 2256475f6387SJan Schmidt 2257475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2258475f6387SJan Schmidt { 2259475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2260475f6387SJan Schmidt struct btrfs_device *dev; 2261475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2262475f6387SJan Schmidt int ret = 0; 2263475f6387SJan Schmidt char *s_uuid = NULL; 2264475f6387SJan Schmidt char empty_uuid[BTRFS_UUID_SIZE] = {0}; 2265475f6387SJan Schmidt 2266475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2267475f6387SJan Schmidt return -EPERM; 2268475f6387SJan Schmidt 2269475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2270475f6387SJan Schmidt if (IS_ERR(di_args)) 2271475f6387SJan Schmidt return PTR_ERR(di_args); 2272475f6387SJan Schmidt 2273475f6387SJan Schmidt if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0) 2274475f6387SJan Schmidt s_uuid = di_args->uuid; 2275475f6387SJan Schmidt 2276475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2277475f6387SJan Schmidt dev = btrfs_find_device(root, di_args->devid, s_uuid, NULL); 2278475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2279475f6387SJan Schmidt 2280475f6387SJan Schmidt if (!dev) { 2281475f6387SJan Schmidt ret = -ENODEV; 2282475f6387SJan Schmidt goto out; 2283475f6387SJan Schmidt } 2284475f6387SJan Schmidt 2285475f6387SJan Schmidt di_args->devid = dev->devid; 2286475f6387SJan Schmidt di_args->bytes_used = dev->bytes_used; 2287475f6387SJan Schmidt di_args->total_bytes = dev->total_bytes; 2288475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2289a27202fbSJim Meyering if (dev->name) { 2290606686eeSJosef Bacik struct rcu_string *name; 2291606686eeSJosef Bacik 2292606686eeSJosef Bacik rcu_read_lock(); 2293606686eeSJosef Bacik name = rcu_dereference(dev->name); 2294606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2295606686eeSJosef Bacik rcu_read_unlock(); 2296a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2297a27202fbSJim Meyering } else { 229899ba55adSStefan Behrens di_args->path[0] = '\0'; 2299a27202fbSJim Meyering } 2300475f6387SJan Schmidt 2301475f6387SJan Schmidt out: 2302475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2303475f6387SJan Schmidt ret = -EFAULT; 2304475f6387SJan Schmidt 2305475f6387SJan Schmidt kfree(di_args); 2306475f6387SJan Schmidt return ret; 2307475f6387SJan Schmidt } 2308475f6387SJan Schmidt 230976dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 2310b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 2311f46b5a66SChristoph Hellwig { 2312f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2313f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2314f46b5a66SChristoph Hellwig struct file *src_file; 2315f46b5a66SChristoph Hellwig struct inode *src; 2316f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2317f46b5a66SChristoph Hellwig struct btrfs_path *path; 2318f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 2319ae01a0abSYan Zheng char *buf; 2320ae01a0abSYan Zheng struct btrfs_key key; 2321f46b5a66SChristoph Hellwig u32 nritems; 2322f46b5a66SChristoph Hellwig int slot; 2323ae01a0abSYan Zheng int ret; 2324c5c9cd4dSSage Weil u64 len = olen; 2325c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 2326c5c9cd4dSSage Weil u64 hint_byte; 2327d20f7043SChris Mason 2328c5c9cd4dSSage Weil /* 2329c5c9cd4dSSage Weil * TODO: 2330c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 2331c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 2332c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 2333c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 2334c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 2335c5c9cd4dSSage Weil * they don't overlap)? 2336c5c9cd4dSSage Weil */ 2337c5c9cd4dSSage Weil 2338e441d54dSChris Mason /* the destination must be opened for writing */ 23392ebc3464SDan Rosenberg if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 2340e441d54dSChris Mason return -EINVAL; 2341e441d54dSChris Mason 2342b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2343b83cc969SLi Zefan return -EROFS; 2344b83cc969SLi Zefan 2345a561be71SAl Viro ret = mnt_want_write_file(file); 2346c146afadSYan Zheng if (ret) 2347c146afadSYan Zheng return ret; 2348c146afadSYan Zheng 2349c5c9cd4dSSage Weil src_file = fget(srcfd); 2350ab67b7c1SYan Zheng if (!src_file) { 2351ab67b7c1SYan Zheng ret = -EBADF; 2352ab67b7c1SYan Zheng goto out_drop_write; 2353ab67b7c1SYan Zheng } 23545dc64164SDan Rosenberg 2355362a20c5SDavid Sterba ret = -EXDEV; 2356362a20c5SDavid Sterba if (src_file->f_path.mnt != file->f_path.mnt) 2357362a20c5SDavid Sterba goto out_fput; 2358362a20c5SDavid Sterba 2359f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 2360f46b5a66SChristoph Hellwig 2361c5c9cd4dSSage Weil ret = -EINVAL; 2362c5c9cd4dSSage Weil if (src == inode) 2363c5c9cd4dSSage Weil goto out_fput; 2364c5c9cd4dSSage Weil 23655dc64164SDan Rosenberg /* the src must be open for reading */ 23665dc64164SDan Rosenberg if (!(src_file->f_mode & FMODE_READ)) 23675dc64164SDan Rosenberg goto out_fput; 23685dc64164SDan Rosenberg 23690e7b824cSLi Zefan /* don't make the dst file partly checksummed */ 23700e7b824cSLi Zefan if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 23710e7b824cSLi Zefan (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 23720e7b824cSLi Zefan goto out_fput; 23730e7b824cSLi Zefan 2374ae01a0abSYan Zheng ret = -EISDIR; 2375ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 2376f46b5a66SChristoph Hellwig goto out_fput; 2377f46b5a66SChristoph Hellwig 2378ae01a0abSYan Zheng ret = -EXDEV; 2379362a20c5SDavid Sterba if (src->i_sb != inode->i_sb) 2380ae01a0abSYan Zheng goto out_fput; 2381ae01a0abSYan Zheng 2382ae01a0abSYan Zheng ret = -ENOMEM; 2383ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 2384ae01a0abSYan Zheng if (!buf) 2385ae01a0abSYan Zheng goto out_fput; 2386ae01a0abSYan Zheng 2387ae01a0abSYan Zheng path = btrfs_alloc_path(); 2388ae01a0abSYan Zheng if (!path) { 2389ae01a0abSYan Zheng vfree(buf); 2390ae01a0abSYan Zheng goto out_fput; 2391ae01a0abSYan Zheng } 2392ae01a0abSYan Zheng path->reada = 2; 2393ae01a0abSYan Zheng 2394f46b5a66SChristoph Hellwig if (inode < src) { 2395fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 2396fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 2397f46b5a66SChristoph Hellwig } else { 2398fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 2399fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 2400f46b5a66SChristoph Hellwig } 2401f46b5a66SChristoph Hellwig 2402c5c9cd4dSSage Weil /* determine range to clone */ 2403c5c9cd4dSSage Weil ret = -EINVAL; 24042ebc3464SDan Rosenberg if (off + len > src->i_size || off + len < off) 2405f46b5a66SChristoph Hellwig goto out_unlock; 2406c5c9cd4dSSage Weil if (len == 0) 2407c5c9cd4dSSage Weil olen = len = src->i_size - off; 2408c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 2409c5c9cd4dSSage Weil if (off + len == src->i_size) 24102a6b8daeSLi Zefan len = ALIGN(src->i_size, bs) - off; 2411c5c9cd4dSSage Weil 2412c5c9cd4dSSage Weil /* verify the end result is block aligned */ 24132a6b8daeSLi Zefan if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 24142a6b8daeSLi Zefan !IS_ALIGNED(destoff, bs)) 2415c5c9cd4dSSage Weil goto out_unlock; 2416c5c9cd4dSSage Weil 2417d525e8abSLi Zefan if (destoff > inode->i_size) { 2418d525e8abSLi Zefan ret = btrfs_cont_expand(inode, inode->i_size, destoff); 2419d525e8abSLi Zefan if (ret) 2420d525e8abSLi Zefan goto out_unlock; 2421d525e8abSLi Zefan } 2422d525e8abSLi Zefan 242371ef0786SLi Zefan /* truncate page cache pages from target inode range */ 242471ef0786SLi Zefan truncate_inode_pages_range(&inode->i_data, destoff, 242571ef0786SLi Zefan PAGE_CACHE_ALIGN(destoff + len) - 1); 242671ef0786SLi Zefan 2427f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 2428f46b5a66SChristoph Hellwig another, and lock file content */ 2429f46b5a66SChristoph Hellwig while (1) { 243031840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 2431d0082371SJeff Mahoney lock_extent(&BTRFS_I(src)->io_tree, off, off+len); 24329a019196SSage Weil ordered = btrfs_lookup_first_ordered_extent(src, off+len); 24339a019196SSage Weil if (!ordered && 24349a019196SSage Weil !test_range_bit(&BTRFS_I(src)->io_tree, off, off+len, 24359a019196SSage Weil EXTENT_DELALLOC, 0, NULL)) 2436f46b5a66SChristoph Hellwig break; 2437d0082371SJeff Mahoney unlock_extent(&BTRFS_I(src)->io_tree, off, off+len); 2438ae01a0abSYan Zheng if (ordered) 2439ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 24409a019196SSage Weil btrfs_wait_ordered_range(src, off, len); 2441f46b5a66SChristoph Hellwig } 2442f46b5a66SChristoph Hellwig 2443c5c9cd4dSSage Weil /* clone data */ 244433345d01SLi Zefan key.objectid = btrfs_ino(src); 2445ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 2446ae01a0abSYan Zheng key.offset = 0; 2447f46b5a66SChristoph Hellwig 2448f46b5a66SChristoph Hellwig while (1) { 2449f46b5a66SChristoph Hellwig /* 2450f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 2451f46b5a66SChristoph Hellwig * tree. 2452f46b5a66SChristoph Hellwig */ 2453362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 2454362a20c5SDavid Sterba 0, 0); 2455f46b5a66SChristoph Hellwig if (ret < 0) 2456f46b5a66SChristoph Hellwig goto out; 2457f46b5a66SChristoph Hellwig 2458ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2459ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 2460362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 2461f46b5a66SChristoph Hellwig if (ret < 0) 2462f46b5a66SChristoph Hellwig goto out; 2463f46b5a66SChristoph Hellwig if (ret > 0) 2464f46b5a66SChristoph Hellwig break; 2465ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2466f46b5a66SChristoph Hellwig } 2467f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 2468f46b5a66SChristoph Hellwig slot = path->slots[0]; 2469f46b5a66SChristoph Hellwig 2470ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 2471d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 247233345d01SLi Zefan key.objectid != btrfs_ino(src)) 2473f46b5a66SChristoph Hellwig break; 2474f46b5a66SChristoph Hellwig 2475c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 2476c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 2477c5c9cd4dSSage Weil int type; 247831840ae1SZheng Yan u32 size; 247931840ae1SZheng Yan struct btrfs_key new_key; 2480c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 2481c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 2482c5c9cd4dSSage Weil u8 comp; 2483b5384d48SSage Weil u64 endoff; 248431840ae1SZheng Yan 248531840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 248631840ae1SZheng Yan read_extent_buffer(leaf, buf, 248731840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 248831840ae1SZheng Yan size); 2489c5c9cd4dSSage Weil 2490c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 2491c5c9cd4dSSage Weil struct btrfs_file_extent_item); 2492c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 2493c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 2494c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2495c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2496d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 2497d397712bSChris Mason extent); 2498d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 2499d397712bSChris Mason extent); 2500c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 2501d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 2502d397712bSChris Mason extent); 2503c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2504c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 2505c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 2506c5c9cd4dSSage Weil extent); 2507c5c9cd4dSSage Weil } 2508b3b4aa74SDavid Sterba btrfs_release_path(path); 250931840ae1SZheng Yan 2510050006a7SSage Weil if (key.offset + datal <= off || 2511c5c9cd4dSSage Weil key.offset >= off+len) 2512c5c9cd4dSSage Weil goto next; 2513c5c9cd4dSSage Weil 251431840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 251533345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 25164d728ec7SLi Zefan if (off <= key.offset) 2517c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 25184d728ec7SLi Zefan else 25194d728ec7SLi Zefan new_key.offset = destoff; 2520c5c9cd4dSSage Weil 2521b6f3409bSSage Weil /* 2522b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 2523b6f3409bSSage Weil * 1 - add new extent 2524b6f3409bSSage Weil * 1 - inode update 2525b6f3409bSSage Weil */ 2526b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 2527a22285a6SYan, Zheng if (IS_ERR(trans)) { 2528a22285a6SYan, Zheng ret = PTR_ERR(trans); 2529a22285a6SYan, Zheng goto out; 2530a22285a6SYan, Zheng } 2531a22285a6SYan, Zheng 2532c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2533c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2534d72c0842SLi Zefan /* 2535d72c0842SLi Zefan * a | --- range to clone ---| b 2536d72c0842SLi Zefan * | ------------- extent ------------- | 2537d72c0842SLi Zefan */ 2538d72c0842SLi Zefan 2539d72c0842SLi Zefan /* substract range b */ 2540d72c0842SLi Zefan if (key.offset + datal > off + len) 2541d72c0842SLi Zefan datal = off + len - key.offset; 2542d72c0842SLi Zefan 2543d72c0842SLi Zefan /* substract range a */ 2544a22285a6SYan, Zheng if (off > key.offset) { 2545a22285a6SYan, Zheng datao += off - key.offset; 2546a22285a6SYan, Zheng datal -= off - key.offset; 2547a22285a6SYan, Zheng } 2548a22285a6SYan, Zheng 2549a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 2550a22285a6SYan, Zheng new_key.offset, 2551a22285a6SYan, Zheng new_key.offset + datal, 2552a22285a6SYan, Zheng &hint_byte, 1); 255379787eaaSJeff Mahoney if (ret) { 255479787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 255579787eaaSJeff Mahoney ret); 255679787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 255779787eaaSJeff Mahoney goto out; 255879787eaaSJeff Mahoney } 2559a22285a6SYan, Zheng 256031840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 256131840ae1SZheng Yan &new_key, size); 256279787eaaSJeff Mahoney if (ret) { 256379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 256479787eaaSJeff Mahoney ret); 256579787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 256679787eaaSJeff Mahoney goto out; 256779787eaaSJeff Mahoney } 256831840ae1SZheng Yan 256931840ae1SZheng Yan leaf = path->nodes[0]; 257031840ae1SZheng Yan slot = path->slots[0]; 257131840ae1SZheng Yan write_extent_buffer(leaf, buf, 257231840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 257331840ae1SZheng Yan size); 2574ae01a0abSYan Zheng 2575f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 2576f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 2577c5c9cd4dSSage Weil 2578c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 2579c5c9cd4dSSage Weil if (!disko) 2580c5c9cd4dSSage Weil datao = 0; 2581c5c9cd4dSSage Weil 2582c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 2583c5c9cd4dSSage Weil datao); 2584c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 2585c5c9cd4dSSage Weil datal); 2586c5c9cd4dSSage Weil if (disko) { 2587c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2588ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 25895d4f98a2SYan Zheng disko, diskl, 0, 2590f46b5a66SChristoph Hellwig root->root_key.objectid, 259133345d01SLi Zefan btrfs_ino(inode), 259266d7e7f0SArne Jansen new_key.offset - datao, 259366d7e7f0SArne Jansen 0); 259479787eaaSJeff Mahoney if (ret) { 259579787eaaSJeff Mahoney btrfs_abort_transaction(trans, 259679787eaaSJeff Mahoney root, 259779787eaaSJeff Mahoney ret); 259879787eaaSJeff Mahoney btrfs_end_transaction(trans, 259979787eaaSJeff Mahoney root); 260079787eaaSJeff Mahoney goto out; 260179787eaaSJeff Mahoney 260279787eaaSJeff Mahoney } 2603f46b5a66SChristoph Hellwig } 2604c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2605c5c9cd4dSSage Weil u64 skip = 0; 2606c5c9cd4dSSage Weil u64 trim = 0; 2607c5c9cd4dSSage Weil if (off > key.offset) { 2608c5c9cd4dSSage Weil skip = off - key.offset; 2609c5c9cd4dSSage Weil new_key.offset += skip; 261031840ae1SZheng Yan } 2611d397712bSChris Mason 2612c5c9cd4dSSage Weil if (key.offset + datal > off+len) 2613c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 2614d397712bSChris Mason 2615c5c9cd4dSSage Weil if (comp && (skip || trim)) { 2616c5c9cd4dSSage Weil ret = -EINVAL; 2617a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 2618c5c9cd4dSSage Weil goto out; 261931840ae1SZheng Yan } 2620c5c9cd4dSSage Weil size -= skip + trim; 2621c5c9cd4dSSage Weil datal -= skip + trim; 2622a22285a6SYan, Zheng 2623a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 2624a22285a6SYan, Zheng new_key.offset, 2625a22285a6SYan, Zheng new_key.offset + datal, 2626a22285a6SYan, Zheng &hint_byte, 1); 262779787eaaSJeff Mahoney if (ret) { 262879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 262979787eaaSJeff Mahoney ret); 263079787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 263179787eaaSJeff Mahoney goto out; 263279787eaaSJeff Mahoney } 2633a22285a6SYan, Zheng 2634c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 2635c5c9cd4dSSage Weil &new_key, size); 263679787eaaSJeff Mahoney if (ret) { 263779787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 263879787eaaSJeff Mahoney ret); 263979787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 264079787eaaSJeff Mahoney goto out; 264179787eaaSJeff Mahoney } 2642c5c9cd4dSSage Weil 2643c5c9cd4dSSage Weil if (skip) { 2644d397712bSChris Mason u32 start = 2645d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 2646c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 2647c5c9cd4dSSage Weil datal); 2648c5c9cd4dSSage Weil } 2649c5c9cd4dSSage Weil 2650c5c9cd4dSSage Weil leaf = path->nodes[0]; 2651c5c9cd4dSSage Weil slot = path->slots[0]; 2652c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 2653c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 2654c5c9cd4dSSage Weil size); 2655c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2656c5c9cd4dSSage Weil } 2657c5c9cd4dSSage Weil 2658c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 2659b3b4aa74SDavid Sterba btrfs_release_path(path); 2660c5c9cd4dSSage Weil 26610c4d2d95SJosef Bacik inode_inc_iversion(inode); 2662a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 2663b5384d48SSage Weil 2664b5384d48SSage Weil /* 2665b5384d48SSage Weil * we round up to the block size at eof when 2666b5384d48SSage Weil * determining which extents to clone above, 2667b5384d48SSage Weil * but shouldn't round up the file size 2668b5384d48SSage Weil */ 2669b5384d48SSage Weil endoff = new_key.offset + datal; 26705f3888ffSLi Zefan if (endoff > destoff+olen) 26715f3888ffSLi Zefan endoff = destoff+olen; 2672b5384d48SSage Weil if (endoff > inode->i_size) 2673b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 2674b5384d48SSage Weil 2675a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 267679787eaaSJeff Mahoney if (ret) { 267779787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 2678a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 267979787eaaSJeff Mahoney goto out; 268079787eaaSJeff Mahoney } 268179787eaaSJeff Mahoney ret = btrfs_end_transaction(trans, root); 2682a22285a6SYan, Zheng } 2683c5c9cd4dSSage Weil next: 2684b3b4aa74SDavid Sterba btrfs_release_path(path); 2685ae01a0abSYan Zheng key.offset++; 2686ae01a0abSYan Zheng } 2687f46b5a66SChristoph Hellwig ret = 0; 2688f46b5a66SChristoph Hellwig out: 2689b3b4aa74SDavid Sterba btrfs_release_path(path); 2690d0082371SJeff Mahoney unlock_extent(&BTRFS_I(src)->io_tree, off, off+len); 2691f46b5a66SChristoph Hellwig out_unlock: 2692f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 2693f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 2694ae01a0abSYan Zheng vfree(buf); 2695ae01a0abSYan Zheng btrfs_free_path(path); 2696f46b5a66SChristoph Hellwig out_fput: 2697f46b5a66SChristoph Hellwig fput(src_file); 2698ab67b7c1SYan Zheng out_drop_write: 26992a79f17eSAl Viro mnt_drop_write_file(file); 2700f46b5a66SChristoph Hellwig return ret; 2701f46b5a66SChristoph Hellwig } 2702f46b5a66SChristoph Hellwig 27037a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 2704c5c9cd4dSSage Weil { 2705c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 2706c5c9cd4dSSage Weil 27077a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 2708c5c9cd4dSSage Weil return -EFAULT; 2709c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 2710c5c9cd4dSSage Weil args.src_length, args.dest_offset); 2711c5c9cd4dSSage Weil } 2712c5c9cd4dSSage Weil 2713f46b5a66SChristoph Hellwig /* 2714f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2715f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2716f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2717f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2718f46b5a66SChristoph Hellwig */ 2719b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 2720f46b5a66SChristoph Hellwig { 2721f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2722f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2723f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 27241ab86aedSSage Weil int ret; 2725f46b5a66SChristoph Hellwig 27261ab86aedSSage Weil ret = -EPERM; 2727df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 2728f46b5a66SChristoph Hellwig goto out; 27291ab86aedSSage Weil 27301ab86aedSSage Weil ret = -EINPROGRESS; 27311ab86aedSSage Weil if (file->private_data) 27321ab86aedSSage Weil goto out; 27339ca9ee09SSage Weil 2734b83cc969SLi Zefan ret = -EROFS; 2735b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2736b83cc969SLi Zefan goto out; 2737b83cc969SLi Zefan 2738a561be71SAl Viro ret = mnt_want_write_file(file); 2739c146afadSYan Zheng if (ret) 2740c146afadSYan Zheng goto out; 2741c146afadSYan Zheng 2742a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 27439ca9ee09SSage Weil 2744f46b5a66SChristoph Hellwig ret = -ENOMEM; 27457a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 2746abd30bb0STsutomu Itoh if (IS_ERR(trans)) 27471ab86aedSSage Weil goto out_drop; 27481ab86aedSSage Weil 27491ab86aedSSage Weil file->private_data = trans; 27501ab86aedSSage Weil return 0; 27511ab86aedSSage Weil 27521ab86aedSSage Weil out_drop: 2753a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 27542a79f17eSAl Viro mnt_drop_write_file(file); 2755f46b5a66SChristoph Hellwig out: 2756f46b5a66SChristoph Hellwig return ret; 2757f46b5a66SChristoph Hellwig } 2758f46b5a66SChristoph Hellwig 27596ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 27606ef5ed0dSJosef Bacik { 27616ef5ed0dSJosef Bacik struct inode *inode = fdentry(file)->d_inode; 27626ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 27636ef5ed0dSJosef Bacik struct btrfs_root *new_root; 27646ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 27656ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 27666ef5ed0dSJosef Bacik struct btrfs_path *path; 27676ef5ed0dSJosef Bacik struct btrfs_key location; 27686ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 27696ef5ed0dSJosef Bacik struct btrfs_super_block *disk_super; 27706ef5ed0dSJosef Bacik u64 features; 27716ef5ed0dSJosef Bacik u64 objectid = 0; 27726ef5ed0dSJosef Bacik u64 dir_id; 27736ef5ed0dSJosef Bacik 27746ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 27756ef5ed0dSJosef Bacik return -EPERM; 27766ef5ed0dSJosef Bacik 27776ef5ed0dSJosef Bacik if (copy_from_user(&objectid, argp, sizeof(objectid))) 27786ef5ed0dSJosef Bacik return -EFAULT; 27796ef5ed0dSJosef Bacik 27806ef5ed0dSJosef Bacik if (!objectid) 27816ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 27826ef5ed0dSJosef Bacik 27836ef5ed0dSJosef Bacik location.objectid = objectid; 27846ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 27856ef5ed0dSJosef Bacik location.offset = (u64)-1; 27866ef5ed0dSJosef Bacik 27876ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 27886ef5ed0dSJosef Bacik if (IS_ERR(new_root)) 27896ef5ed0dSJosef Bacik return PTR_ERR(new_root); 27906ef5ed0dSJosef Bacik 27916ef5ed0dSJosef Bacik if (btrfs_root_refs(&new_root->root_item) == 0) 27926ef5ed0dSJosef Bacik return -ENOENT; 27936ef5ed0dSJosef Bacik 27946ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 27956ef5ed0dSJosef Bacik if (!path) 27966ef5ed0dSJosef Bacik return -ENOMEM; 27976ef5ed0dSJosef Bacik path->leave_spinning = 1; 27986ef5ed0dSJosef Bacik 27996ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 280098d5dc13STsutomu Itoh if (IS_ERR(trans)) { 28016ef5ed0dSJosef Bacik btrfs_free_path(path); 280298d5dc13STsutomu Itoh return PTR_ERR(trans); 28036ef5ed0dSJosef Bacik } 28046ef5ed0dSJosef Bacik 28056c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 28066ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 28076ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 2808cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 28096ef5ed0dSJosef Bacik btrfs_free_path(path); 28106ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 28116ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 28126ef5ed0dSJosef Bacik "this isn't going to work\n"); 28136ef5ed0dSJosef Bacik return -ENOENT; 28146ef5ed0dSJosef Bacik } 28156ef5ed0dSJosef Bacik 28166ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 28176ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 28186ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 28196ef5ed0dSJosef Bacik btrfs_free_path(path); 28206ef5ed0dSJosef Bacik 28216c41761fSDavid Sterba disk_super = root->fs_info->super_copy; 28226ef5ed0dSJosef Bacik features = btrfs_super_incompat_flags(disk_super); 28236ef5ed0dSJosef Bacik if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { 28246ef5ed0dSJosef Bacik features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; 28256ef5ed0dSJosef Bacik btrfs_set_super_incompat_flags(disk_super, features); 28266ef5ed0dSJosef Bacik } 28276ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 28286ef5ed0dSJosef Bacik 28296ef5ed0dSJosef Bacik return 0; 28306ef5ed0dSJosef Bacik } 28316ef5ed0dSJosef Bacik 2832bf5fc093SJosef Bacik static void get_block_group_info(struct list_head *groups_list, 2833bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 2834bf5fc093SJosef Bacik { 2835bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 2836bf5fc093SJosef Bacik 2837bf5fc093SJosef Bacik space->total_bytes = 0; 2838bf5fc093SJosef Bacik space->used_bytes = 0; 2839bf5fc093SJosef Bacik space->flags = 0; 2840bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 2841bf5fc093SJosef Bacik space->flags = block_group->flags; 2842bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 2843bf5fc093SJosef Bacik space->used_bytes += 2844bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 2845bf5fc093SJosef Bacik } 2846bf5fc093SJosef Bacik } 2847bf5fc093SJosef Bacik 28481406e432SJosef Bacik long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 28491406e432SJosef Bacik { 28501406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 28511406e432SJosef Bacik struct btrfs_ioctl_space_info space; 28521406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 28537fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 285413f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 28551406e432SJosef Bacik struct btrfs_space_info *info; 2856bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 2857bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 2858bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 2859bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 2860bf5fc093SJosef Bacik int num_types = 4; 28617fde62bfSChris Mason int alloc_size; 28621406e432SJosef Bacik int ret = 0; 286351788b1bSDan Rosenberg u64 slot_count = 0; 2864bf5fc093SJosef Bacik int i, c; 28651406e432SJosef Bacik 28661406e432SJosef Bacik if (copy_from_user(&space_args, 28671406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 28681406e432SJosef Bacik sizeof(space_args))) 28691406e432SJosef Bacik return -EFAULT; 28701406e432SJosef Bacik 2871bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2872bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2873bf5fc093SJosef Bacik 2874bf5fc093SJosef Bacik info = NULL; 28757fde62bfSChris Mason rcu_read_lock(); 2876bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2877bf5fc093SJosef Bacik list) { 2878bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2879bf5fc093SJosef Bacik info = tmp; 2880bf5fc093SJosef Bacik break; 2881bf5fc093SJosef Bacik } 2882bf5fc093SJosef Bacik } 28837fde62bfSChris Mason rcu_read_unlock(); 28841406e432SJosef Bacik 2885bf5fc093SJosef Bacik if (!info) 2886bf5fc093SJosef Bacik continue; 2887bf5fc093SJosef Bacik 2888bf5fc093SJosef Bacik down_read(&info->groups_sem); 2889bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2890bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 2891bf5fc093SJosef Bacik slot_count++; 2892bf5fc093SJosef Bacik } 2893bf5fc093SJosef Bacik up_read(&info->groups_sem); 2894bf5fc093SJosef Bacik } 2895bf5fc093SJosef Bacik 28967fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 28977fde62bfSChris Mason if (space_args.space_slots == 0) { 28987fde62bfSChris Mason space_args.total_spaces = slot_count; 28997fde62bfSChris Mason goto out; 29007fde62bfSChris Mason } 2901bf5fc093SJosef Bacik 290251788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 2903bf5fc093SJosef Bacik 29047fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 2905bf5fc093SJosef Bacik 29067fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 29077fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 29087fde62bfSChris Mason */ 29097fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 29107fde62bfSChris Mason return -ENOMEM; 29117fde62bfSChris Mason 29127fde62bfSChris Mason space_args.total_spaces = 0; 29137fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 29147fde62bfSChris Mason if (!dest) 29157fde62bfSChris Mason return -ENOMEM; 29167fde62bfSChris Mason dest_orig = dest; 29177fde62bfSChris Mason 29187fde62bfSChris Mason /* now we have a buffer to copy into */ 2919bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2920bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2921bf5fc093SJosef Bacik 292251788b1bSDan Rosenberg if (!slot_count) 292351788b1bSDan Rosenberg break; 292451788b1bSDan Rosenberg 2925bf5fc093SJosef Bacik info = NULL; 29261406e432SJosef Bacik rcu_read_lock(); 2927bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2928bf5fc093SJosef Bacik list) { 2929bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2930bf5fc093SJosef Bacik info = tmp; 29317fde62bfSChris Mason break; 2932bf5fc093SJosef Bacik } 2933bf5fc093SJosef Bacik } 2934bf5fc093SJosef Bacik rcu_read_unlock(); 29357fde62bfSChris Mason 2936bf5fc093SJosef Bacik if (!info) 2937bf5fc093SJosef Bacik continue; 2938bf5fc093SJosef Bacik down_read(&info->groups_sem); 2939bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2940bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 2941bf5fc093SJosef Bacik get_block_group_info(&info->block_groups[c], 2942bf5fc093SJosef Bacik &space); 29437fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 29441406e432SJosef Bacik dest++; 29451406e432SJosef Bacik space_args.total_spaces++; 294651788b1bSDan Rosenberg slot_count--; 29471406e432SJosef Bacik } 294851788b1bSDan Rosenberg if (!slot_count) 294951788b1bSDan Rosenberg break; 2950bf5fc093SJosef Bacik } 2951bf5fc093SJosef Bacik up_read(&info->groups_sem); 2952bf5fc093SJosef Bacik } 29531406e432SJosef Bacik 29542eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 29557fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 29567fde62bfSChris Mason 29577fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 29587fde62bfSChris Mason ret = -EFAULT; 29597fde62bfSChris Mason 29607fde62bfSChris Mason kfree(dest_orig); 29617fde62bfSChris Mason out: 29627fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 29631406e432SJosef Bacik ret = -EFAULT; 29641406e432SJosef Bacik 29651406e432SJosef Bacik return ret; 29661406e432SJosef Bacik } 29671406e432SJosef Bacik 2968f46b5a66SChristoph Hellwig /* 2969f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2970f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2971f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2972f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2973f46b5a66SChristoph Hellwig */ 2974f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 2975f46b5a66SChristoph Hellwig { 2976f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2977f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2978f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2979f46b5a66SChristoph Hellwig 2980f46b5a66SChristoph Hellwig trans = file->private_data; 29811ab86aedSSage Weil if (!trans) 29821ab86aedSSage Weil return -EINVAL; 2983b214107eSChristoph Hellwig file->private_data = NULL; 29849ca9ee09SSage Weil 29851ab86aedSSage Weil btrfs_end_transaction(trans, root); 29861ab86aedSSage Weil 2987a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 29889ca9ee09SSage Weil 29892a79f17eSAl Viro mnt_drop_write_file(file); 29901ab86aedSSage Weil return 0; 2991f46b5a66SChristoph Hellwig } 2992f46b5a66SChristoph Hellwig 299346204592SSage Weil static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp) 299446204592SSage Weil { 299546204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 299646204592SSage Weil struct btrfs_trans_handle *trans; 299746204592SSage Weil u64 transid; 2998db5b493aSTsutomu Itoh int ret; 299946204592SSage Weil 300046204592SSage Weil trans = btrfs_start_transaction(root, 0); 300198d5dc13STsutomu Itoh if (IS_ERR(trans)) 300298d5dc13STsutomu Itoh return PTR_ERR(trans); 300346204592SSage Weil transid = trans->transid; 3004db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 30058b2b2d3cSTsutomu Itoh if (ret) { 30068b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 3007db5b493aSTsutomu Itoh return ret; 30088b2b2d3cSTsutomu Itoh } 300946204592SSage Weil 301046204592SSage Weil if (argp) 301146204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 301246204592SSage Weil return -EFAULT; 301346204592SSage Weil return 0; 301446204592SSage Weil } 301546204592SSage Weil 301646204592SSage Weil static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) 301746204592SSage Weil { 301846204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 301946204592SSage Weil u64 transid; 302046204592SSage Weil 302146204592SSage Weil if (argp) { 302246204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 302346204592SSage Weil return -EFAULT; 302446204592SSage Weil } else { 302546204592SSage Weil transid = 0; /* current trans */ 302646204592SSage Weil } 302746204592SSage Weil return btrfs_wait_for_commit(root, transid); 302846204592SSage Weil } 302946204592SSage Weil 3030475f6387SJan Schmidt static long btrfs_ioctl_scrub(struct btrfs_root *root, void __user *arg) 3031475f6387SJan Schmidt { 3032475f6387SJan Schmidt int ret; 3033475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3034475f6387SJan Schmidt 3035475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3036475f6387SJan Schmidt return -EPERM; 3037475f6387SJan Schmidt 3038475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3039475f6387SJan Schmidt if (IS_ERR(sa)) 3040475f6387SJan Schmidt return PTR_ERR(sa); 3041475f6387SJan Schmidt 3042475f6387SJan Schmidt ret = btrfs_scrub_dev(root, sa->devid, sa->start, sa->end, 30438628764eSArne Jansen &sa->progress, sa->flags & BTRFS_SCRUB_READONLY); 3044475f6387SJan Schmidt 3045475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3046475f6387SJan Schmidt ret = -EFAULT; 3047475f6387SJan Schmidt 3048475f6387SJan Schmidt kfree(sa); 3049475f6387SJan Schmidt return ret; 3050475f6387SJan Schmidt } 3051475f6387SJan Schmidt 3052475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 3053475f6387SJan Schmidt { 3054475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3055475f6387SJan Schmidt return -EPERM; 3056475f6387SJan Schmidt 3057475f6387SJan Schmidt return btrfs_scrub_cancel(root); 3058475f6387SJan Schmidt } 3059475f6387SJan Schmidt 3060475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 3061475f6387SJan Schmidt void __user *arg) 3062475f6387SJan Schmidt { 3063475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3064475f6387SJan Schmidt int ret; 3065475f6387SJan Schmidt 3066475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3067475f6387SJan Schmidt return -EPERM; 3068475f6387SJan Schmidt 3069475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3070475f6387SJan Schmidt if (IS_ERR(sa)) 3071475f6387SJan Schmidt return PTR_ERR(sa); 3072475f6387SJan Schmidt 3073475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 3074475f6387SJan Schmidt 3075475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3076475f6387SJan Schmidt ret = -EFAULT; 3077475f6387SJan Schmidt 3078475f6387SJan Schmidt kfree(sa); 3079475f6387SJan Schmidt return ret; 3080475f6387SJan Schmidt } 3081475f6387SJan Schmidt 3082c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 3083c11d2c23SStefan Behrens void __user *arg, int reset_after_read) 3084c11d2c23SStefan Behrens { 3085c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3086c11d2c23SStefan Behrens int ret; 3087c11d2c23SStefan Behrens 3088c11d2c23SStefan Behrens if (reset_after_read && !capable(CAP_SYS_ADMIN)) 3089c11d2c23SStefan Behrens return -EPERM; 3090c11d2c23SStefan Behrens 3091c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3092c11d2c23SStefan Behrens if (IS_ERR(sa)) 3093c11d2c23SStefan Behrens return PTR_ERR(sa); 3094c11d2c23SStefan Behrens 3095c11d2c23SStefan Behrens ret = btrfs_get_dev_stats(root, sa, reset_after_read); 3096c11d2c23SStefan Behrens 3097c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 3098c11d2c23SStefan Behrens ret = -EFAULT; 3099c11d2c23SStefan Behrens 3100c11d2c23SStefan Behrens kfree(sa); 3101c11d2c23SStefan Behrens return ret; 3102c11d2c23SStefan Behrens } 3103c11d2c23SStefan Behrens 3104d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3105d7728c96SJan Schmidt { 3106d7728c96SJan Schmidt int ret = 0; 3107d7728c96SJan Schmidt int i; 3108740c3d22SChris Mason u64 rel_ptr; 3109d7728c96SJan Schmidt int size; 3110806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3111d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3112d7728c96SJan Schmidt struct btrfs_path *path; 3113d7728c96SJan Schmidt 3114d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3115d7728c96SJan Schmidt return -EPERM; 3116d7728c96SJan Schmidt 3117d7728c96SJan Schmidt path = btrfs_alloc_path(); 3118d7728c96SJan Schmidt if (!path) { 3119d7728c96SJan Schmidt ret = -ENOMEM; 3120d7728c96SJan Schmidt goto out; 3121d7728c96SJan Schmidt } 3122d7728c96SJan Schmidt 3123d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3124d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3125d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3126d7728c96SJan Schmidt ipa = NULL; 3127d7728c96SJan Schmidt goto out; 3128d7728c96SJan Schmidt } 3129d7728c96SJan Schmidt 3130d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3131d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3132d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3133d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3134d7728c96SJan Schmidt ipath = NULL; 3135d7728c96SJan Schmidt goto out; 3136d7728c96SJan Schmidt } 3137d7728c96SJan Schmidt 3138d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3139d7728c96SJan Schmidt if (ret < 0) 3140d7728c96SJan Schmidt goto out; 3141d7728c96SJan Schmidt 3142d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3143745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3144745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3145740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3146d7728c96SJan Schmidt } 3147d7728c96SJan Schmidt 3148745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 3149745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 3150d7728c96SJan Schmidt if (ret) { 3151d7728c96SJan Schmidt ret = -EFAULT; 3152d7728c96SJan Schmidt goto out; 3153d7728c96SJan Schmidt } 3154d7728c96SJan Schmidt 3155d7728c96SJan Schmidt out: 3156d7728c96SJan Schmidt btrfs_free_path(path); 3157d7728c96SJan Schmidt free_ipath(ipath); 3158d7728c96SJan Schmidt kfree(ipa); 3159d7728c96SJan Schmidt 3160d7728c96SJan Schmidt return ret; 3161d7728c96SJan Schmidt } 3162d7728c96SJan Schmidt 3163d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3164d7728c96SJan Schmidt { 3165d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3166d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3167d7728c96SJan Schmidt 3168d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3169d7728c96SJan Schmidt inodes->bytes_left -= c; 3170d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3171d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3172d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3173d7728c96SJan Schmidt inodes->elem_cnt += 3; 3174d7728c96SJan Schmidt } else { 3175d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3176d7728c96SJan Schmidt inodes->bytes_left = 0; 3177d7728c96SJan Schmidt inodes->elem_missed += 3; 3178d7728c96SJan Schmidt } 3179d7728c96SJan Schmidt 3180d7728c96SJan Schmidt return 0; 3181d7728c96SJan Schmidt } 3182d7728c96SJan Schmidt 3183d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 3184d7728c96SJan Schmidt void __user *arg) 3185d7728c96SJan Schmidt { 3186d7728c96SJan Schmidt int ret = 0; 3187d7728c96SJan Schmidt int size; 31884692cf58SJan Schmidt u64 extent_item_pos; 3189d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3190d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3191d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3192d7728c96SJan Schmidt struct btrfs_key key; 3193d7728c96SJan Schmidt 3194d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3195d7728c96SJan Schmidt return -EPERM; 3196d7728c96SJan Schmidt 3197d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 3198d7728c96SJan Schmidt if (IS_ERR(loi)) { 3199d7728c96SJan Schmidt ret = PTR_ERR(loi); 3200d7728c96SJan Schmidt loi = NULL; 3201d7728c96SJan Schmidt goto out; 3202d7728c96SJan Schmidt } 3203d7728c96SJan Schmidt 3204d7728c96SJan Schmidt path = btrfs_alloc_path(); 3205d7728c96SJan Schmidt if (!path) { 3206d7728c96SJan Schmidt ret = -ENOMEM; 3207d7728c96SJan Schmidt goto out; 3208d7728c96SJan Schmidt } 3209d7728c96SJan Schmidt 3210d7728c96SJan Schmidt size = min_t(u32, loi->size, 4096); 3211d7728c96SJan Schmidt inodes = init_data_container(size); 3212d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3213d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3214d7728c96SJan Schmidt inodes = NULL; 3215d7728c96SJan Schmidt goto out; 3216d7728c96SJan Schmidt } 3217d7728c96SJan Schmidt 3218d7728c96SJan Schmidt ret = extent_from_logical(root->fs_info, loi->logical, path, &key); 32194692cf58SJan Schmidt btrfs_release_path(path); 3220d7728c96SJan Schmidt 3221d7728c96SJan Schmidt if (ret & BTRFS_EXTENT_FLAG_TREE_BLOCK) 3222d7728c96SJan Schmidt ret = -ENOENT; 3223d7728c96SJan Schmidt if (ret < 0) 3224d7728c96SJan Schmidt goto out; 3225d7728c96SJan Schmidt 32264692cf58SJan Schmidt extent_item_pos = loi->logical - key.objectid; 32277a3ae2f8SJan Schmidt ret = iterate_extent_inodes(root->fs_info, key.objectid, 32287a3ae2f8SJan Schmidt extent_item_pos, 0, build_ino_list, 32294692cf58SJan Schmidt inodes); 3230d7728c96SJan Schmidt 3231d7728c96SJan Schmidt if (ret < 0) 3232d7728c96SJan Schmidt goto out; 3233d7728c96SJan Schmidt 3234745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 3235745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 3236d7728c96SJan Schmidt if (ret) 3237d7728c96SJan Schmidt ret = -EFAULT; 3238d7728c96SJan Schmidt 3239d7728c96SJan Schmidt out: 3240d7728c96SJan Schmidt btrfs_free_path(path); 3241d7728c96SJan Schmidt kfree(inodes); 3242d7728c96SJan Schmidt kfree(loi); 3243d7728c96SJan Schmidt 3244d7728c96SJan Schmidt return ret; 3245d7728c96SJan Schmidt } 3246d7728c96SJan Schmidt 324719a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 3248c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3249c9e9f97bSIlya Dryomov { 3250c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3251c9e9f97bSIlya Dryomov 3252c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3253c9e9f97bSIlya Dryomov 3254837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 3255837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3256837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3257837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3258a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3259a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3260837d5b6eSIlya Dryomov 3261c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3262c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3263c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 326419a39dceSIlya Dryomov 326519a39dceSIlya Dryomov if (lock) { 326619a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 326719a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 326819a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 326919a39dceSIlya Dryomov } else { 327019a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 327119a39dceSIlya Dryomov } 3272c9e9f97bSIlya Dryomov } 3273c9e9f97bSIlya Dryomov 32749ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3275c9e9f97bSIlya Dryomov { 32769ba1f6e4SLiu Bo struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 3277c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3278c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3279c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3280c9e9f97bSIlya Dryomov int ret; 3281c9e9f97bSIlya Dryomov 3282c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3283c9e9f97bSIlya Dryomov return -EPERM; 3284c9e9f97bSIlya Dryomov 3285c9e9f97bSIlya Dryomov if (fs_info->sb->s_flags & MS_RDONLY) 3286c9e9f97bSIlya Dryomov return -EROFS; 3287c9e9f97bSIlya Dryomov 32889ba1f6e4SLiu Bo ret = mnt_want_write(file->f_path.mnt); 32899ba1f6e4SLiu Bo if (ret) 32909ba1f6e4SLiu Bo return ret; 32919ba1f6e4SLiu Bo 3292c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 3293c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3294c9e9f97bSIlya Dryomov 3295c9e9f97bSIlya Dryomov if (arg) { 3296c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 3297c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 3298c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 3299c9e9f97bSIlya Dryomov goto out; 3300c9e9f97bSIlya Dryomov } 3301de322263SIlya Dryomov 3302de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3303de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3304de322263SIlya Dryomov ret = -ENOTCONN; 3305de322263SIlya Dryomov goto out_bargs; 3306de322263SIlya Dryomov } 3307de322263SIlya Dryomov 3308de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3309de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3310de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3311de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3312de322263SIlya Dryomov 3313de322263SIlya Dryomov goto do_balance; 3314de322263SIlya Dryomov } 3315c9e9f97bSIlya Dryomov } else { 3316c9e9f97bSIlya Dryomov bargs = NULL; 3317c9e9f97bSIlya Dryomov } 3318c9e9f97bSIlya Dryomov 3319837d5b6eSIlya Dryomov if (fs_info->balance_ctl) { 3320837d5b6eSIlya Dryomov ret = -EINPROGRESS; 3321837d5b6eSIlya Dryomov goto out_bargs; 3322837d5b6eSIlya Dryomov } 3323837d5b6eSIlya Dryomov 3324c9e9f97bSIlya Dryomov bctl = kzalloc(sizeof(*bctl), GFP_NOFS); 3325c9e9f97bSIlya Dryomov if (!bctl) { 3326c9e9f97bSIlya Dryomov ret = -ENOMEM; 3327c9e9f97bSIlya Dryomov goto out_bargs; 3328c9e9f97bSIlya Dryomov } 3329c9e9f97bSIlya Dryomov 3330c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 3331c9e9f97bSIlya Dryomov if (arg) { 3332c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 3333c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 3334c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 3335c9e9f97bSIlya Dryomov 3336c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 3337f43ffb60SIlya Dryomov } else { 3338f43ffb60SIlya Dryomov /* balance everything - no filters */ 3339f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 3340c9e9f97bSIlya Dryomov } 3341c9e9f97bSIlya Dryomov 3342de322263SIlya Dryomov do_balance: 3343c9e9f97bSIlya Dryomov ret = btrfs_balance(bctl, bargs); 3344c9e9f97bSIlya Dryomov /* 3345837d5b6eSIlya Dryomov * bctl is freed in __cancel_balance or in free_fs_info if 3346837d5b6eSIlya Dryomov * restriper was paused all the way until unmount 3347c9e9f97bSIlya Dryomov */ 3348c9e9f97bSIlya Dryomov if (arg) { 3349c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 3350c9e9f97bSIlya Dryomov ret = -EFAULT; 3351c9e9f97bSIlya Dryomov } 3352c9e9f97bSIlya Dryomov 3353c9e9f97bSIlya Dryomov out_bargs: 3354c9e9f97bSIlya Dryomov kfree(bargs); 3355c9e9f97bSIlya Dryomov out: 3356c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3357c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 33589ba1f6e4SLiu Bo mnt_drop_write(file->f_path.mnt); 3359c9e9f97bSIlya Dryomov return ret; 3360c9e9f97bSIlya Dryomov } 3361c9e9f97bSIlya Dryomov 3362837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 3363837d5b6eSIlya Dryomov { 3364837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3365837d5b6eSIlya Dryomov return -EPERM; 3366837d5b6eSIlya Dryomov 3367837d5b6eSIlya Dryomov switch (cmd) { 3368837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 3369837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 3370a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 3371a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 3372837d5b6eSIlya Dryomov } 3373837d5b6eSIlya Dryomov 3374837d5b6eSIlya Dryomov return -EINVAL; 3375837d5b6eSIlya Dryomov } 3376837d5b6eSIlya Dryomov 337719a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 337819a39dceSIlya Dryomov void __user *arg) 337919a39dceSIlya Dryomov { 338019a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 338119a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 338219a39dceSIlya Dryomov int ret = 0; 338319a39dceSIlya Dryomov 338419a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 338519a39dceSIlya Dryomov return -EPERM; 338619a39dceSIlya Dryomov 338719a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 338819a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 338919a39dceSIlya Dryomov ret = -ENOTCONN; 339019a39dceSIlya Dryomov goto out; 339119a39dceSIlya Dryomov } 339219a39dceSIlya Dryomov 339319a39dceSIlya Dryomov bargs = kzalloc(sizeof(*bargs), GFP_NOFS); 339419a39dceSIlya Dryomov if (!bargs) { 339519a39dceSIlya Dryomov ret = -ENOMEM; 339619a39dceSIlya Dryomov goto out; 339719a39dceSIlya Dryomov } 339819a39dceSIlya Dryomov 339919a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 340019a39dceSIlya Dryomov 340119a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 340219a39dceSIlya Dryomov ret = -EFAULT; 340319a39dceSIlya Dryomov 340419a39dceSIlya Dryomov kfree(bargs); 340519a39dceSIlya Dryomov out: 340619a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 340719a39dceSIlya Dryomov return ret; 340819a39dceSIlya Dryomov } 340919a39dceSIlya Dryomov 34108ea05e3aSAlexander Block static long btrfs_ioctl_set_received_subvol(struct file *file, 34118ea05e3aSAlexander Block void __user *arg) 34128ea05e3aSAlexander Block { 34138ea05e3aSAlexander Block struct btrfs_ioctl_received_subvol_args *sa = NULL; 34148ea05e3aSAlexander Block struct inode *inode = fdentry(file)->d_inode; 34158ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 34168ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 34178ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 34188ea05e3aSAlexander Block struct timespec ct = CURRENT_TIME; 34198ea05e3aSAlexander Block int ret = 0; 34208ea05e3aSAlexander Block 34218ea05e3aSAlexander Block ret = mnt_want_write_file(file); 34228ea05e3aSAlexander Block if (ret < 0) 34238ea05e3aSAlexander Block return ret; 34248ea05e3aSAlexander Block 34258ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 34268ea05e3aSAlexander Block 34278ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 34288ea05e3aSAlexander Block ret = -EINVAL; 34298ea05e3aSAlexander Block goto out; 34308ea05e3aSAlexander Block } 34318ea05e3aSAlexander Block 34328ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 34338ea05e3aSAlexander Block ret = -EROFS; 34348ea05e3aSAlexander Block goto out; 34358ea05e3aSAlexander Block } 34368ea05e3aSAlexander Block 34378ea05e3aSAlexander Block if (!inode_owner_or_capable(inode)) { 34388ea05e3aSAlexander Block ret = -EACCES; 34398ea05e3aSAlexander Block goto out; 34408ea05e3aSAlexander Block } 34418ea05e3aSAlexander Block 34428ea05e3aSAlexander Block sa = memdup_user(arg, sizeof(*sa)); 34438ea05e3aSAlexander Block if (IS_ERR(sa)) { 34448ea05e3aSAlexander Block ret = PTR_ERR(sa); 34458ea05e3aSAlexander Block sa = NULL; 34468ea05e3aSAlexander Block goto out; 34478ea05e3aSAlexander Block } 34488ea05e3aSAlexander Block 34498ea05e3aSAlexander Block trans = btrfs_start_transaction(root, 1); 34508ea05e3aSAlexander Block if (IS_ERR(trans)) { 34518ea05e3aSAlexander Block ret = PTR_ERR(trans); 34528ea05e3aSAlexander Block trans = NULL; 34538ea05e3aSAlexander Block goto out; 34548ea05e3aSAlexander Block } 34558ea05e3aSAlexander Block 34568ea05e3aSAlexander Block sa->rtransid = trans->transid; 34578ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 34588ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 34598ea05e3aSAlexander Block 34608ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 34618ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 34628ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 34638ea05e3aSAlexander Block root_item->stime.sec = cpu_to_le64(sa->stime.sec); 34648ea05e3aSAlexander Block root_item->stime.nsec = cpu_to_le32(sa->stime.nsec); 34658ea05e3aSAlexander Block root_item->rtime.sec = cpu_to_le64(sa->rtime.sec); 34668ea05e3aSAlexander Block root_item->rtime.nsec = cpu_to_le32(sa->rtime.nsec); 34678ea05e3aSAlexander Block 34688ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 34698ea05e3aSAlexander Block &root->root_key, &root->root_item); 34708ea05e3aSAlexander Block if (ret < 0) { 34718ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 34728ea05e3aSAlexander Block trans = NULL; 34738ea05e3aSAlexander Block goto out; 34748ea05e3aSAlexander Block } else { 34758ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 34768ea05e3aSAlexander Block if (ret < 0) 34778ea05e3aSAlexander Block goto out; 34788ea05e3aSAlexander Block } 34798ea05e3aSAlexander Block 34808ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 34818ea05e3aSAlexander Block if (ret) 34828ea05e3aSAlexander Block ret = -EFAULT; 34838ea05e3aSAlexander Block 34848ea05e3aSAlexander Block out: 34858ea05e3aSAlexander Block kfree(sa); 34868ea05e3aSAlexander Block up_write(&root->fs_info->subvol_sem); 34878ea05e3aSAlexander Block mnt_drop_write_file(file); 34888ea05e3aSAlexander Block return ret; 34898ea05e3aSAlexander Block } 34908ea05e3aSAlexander Block 3491f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 3492f46b5a66SChristoph Hellwig cmd, unsigned long arg) 3493f46b5a66SChristoph Hellwig { 3494f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 34954bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 3496f46b5a66SChristoph Hellwig 3497f46b5a66SChristoph Hellwig switch (cmd) { 34986cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 34996cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 35006cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 35016cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 35026cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 35036cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 3504f7039b1dSLi Dongyang case FITRIM: 3505f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 3506f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 3507fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 3508fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 3509fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 35103de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 3511fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 351276dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 351376dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 35140caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 35150caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 35160caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 35170caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 35186ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 35196ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 3520f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 35211e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 35221e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 35231e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 3524f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 35254bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 3526f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 35274bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 3528f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 35294bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 3530475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 3531475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 3532475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 3533475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 3534f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 35359ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 3536f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 3537c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 3538c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 35397a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 3540f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 3541f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 3542f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 3543f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 3544ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 3545ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 3546ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 3547ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 3548d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 3549d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 3550d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 3551d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 35521406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 35531406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 3554f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 3555f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 3556f46b5a66SChristoph Hellwig return 0; 355746204592SSage Weil case BTRFS_IOC_START_SYNC: 355846204592SSage Weil return btrfs_ioctl_start_sync(file, argp); 355946204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 356046204592SSage Weil return btrfs_ioctl_wait_sync(file, argp); 3561475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 3562475f6387SJan Schmidt return btrfs_ioctl_scrub(root, argp); 3563475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 3564475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 3565475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 3566475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 3567c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 35689ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 3569837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 3570837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 357119a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 357219a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 35738ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 35748ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 3575*31db9f7cSAlexander Block case BTRFS_IOC_SEND: 3576*31db9f7cSAlexander Block return btrfs_ioctl_send(file, argp); 3577c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 3578c11d2c23SStefan Behrens return btrfs_ioctl_get_dev_stats(root, argp, 0); 3579c11d2c23SStefan Behrens case BTRFS_IOC_GET_AND_RESET_DEV_STATS: 3580c11d2c23SStefan Behrens return btrfs_ioctl_get_dev_stats(root, argp, 1); 3581f46b5a66SChristoph Hellwig } 3582f46b5a66SChristoph Hellwig 3583f46b5a66SChristoph Hellwig return -ENOTTY; 3584f46b5a66SChristoph Hellwig } 3585