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" 57f46b5a66SChristoph Hellwig 586cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 596cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 606cbff00fSChristoph Hellwig { 616cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 626cbff00fSChristoph Hellwig return flags; 636cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 646cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 656cbff00fSChristoph Hellwig else 666cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 676cbff00fSChristoph Hellwig } 68f46b5a66SChristoph Hellwig 696cbff00fSChristoph Hellwig /* 706cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 716cbff00fSChristoph Hellwig */ 726cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 736cbff00fSChristoph Hellwig { 746cbff00fSChristoph Hellwig unsigned int iflags = 0; 756cbff00fSChristoph Hellwig 766cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 776cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 786cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 796cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 806cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 816cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 826cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 836cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 846cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 856cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 866cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 876cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 88d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 89d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 90d0092bddSLi Zefan 91d0092bddSLi Zefan if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) 92d0092bddSLi Zefan iflags |= FS_COMPR_FL; 93d0092bddSLi Zefan else if (flags & BTRFS_INODE_NOCOMPRESS) 94d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 956cbff00fSChristoph Hellwig 966cbff00fSChristoph Hellwig return iflags; 976cbff00fSChristoph Hellwig } 986cbff00fSChristoph Hellwig 996cbff00fSChristoph Hellwig /* 1006cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1016cbff00fSChristoph Hellwig */ 1026cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 1036cbff00fSChristoph Hellwig { 1046cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1056cbff00fSChristoph Hellwig 1066cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 1076cbff00fSChristoph Hellwig 1086cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 1096cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 1106cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1116cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1126cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1136cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1146cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1156cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1166cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1176cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1186cbff00fSChristoph Hellwig } 1196cbff00fSChristoph Hellwig 1206cbff00fSChristoph Hellwig /* 1216cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1226cbff00fSChristoph Hellwig * 123e27425d6SJosef Bacik * Currently only the compression flags and the cow flags are inherited. 1246cbff00fSChristoph Hellwig */ 1256cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1266cbff00fSChristoph Hellwig { 1270b4dcea5SChris Mason unsigned int flags; 1280b4dcea5SChris Mason 1290b4dcea5SChris Mason if (!dir) 1300b4dcea5SChris Mason return; 1310b4dcea5SChris Mason 1320b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1336cbff00fSChristoph Hellwig 134e27425d6SJosef Bacik if (flags & BTRFS_INODE_NOCOMPRESS) { 135e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; 136e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; 137e27425d6SJosef Bacik } else if (flags & BTRFS_INODE_COMPRESS) { 138e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; 139e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; 140e27425d6SJosef Bacik } 1416cbff00fSChristoph Hellwig 142e27425d6SJosef Bacik if (flags & BTRFS_INODE_NODATACOW) 143e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; 144e27425d6SJosef Bacik 1456cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1466cbff00fSChristoph Hellwig } 1476cbff00fSChristoph Hellwig 1486cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1496cbff00fSChristoph Hellwig { 1506cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); 1516cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1526cbff00fSChristoph Hellwig 1536cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1546cbff00fSChristoph Hellwig return -EFAULT; 1556cbff00fSChristoph Hellwig return 0; 1566cbff00fSChristoph Hellwig } 1576cbff00fSChristoph Hellwig 15875e7cb7fSLiu Bo static int check_flags(unsigned int flags) 15975e7cb7fSLiu Bo { 16075e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 16175e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 16275e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 163e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 164e1e8fb6aSLi Zefan FS_NOCOW_FL)) 16575e7cb7fSLiu Bo return -EOPNOTSUPP; 16675e7cb7fSLiu Bo 16775e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 16875e7cb7fSLiu Bo return -EINVAL; 16975e7cb7fSLiu Bo 17075e7cb7fSLiu Bo return 0; 17175e7cb7fSLiu Bo } 17275e7cb7fSLiu Bo 1736cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1746cbff00fSChristoph Hellwig { 1756cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 1766cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1776cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1786cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1796cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1806cbff00fSChristoph Hellwig int ret; 181f062abf0SLi Zefan u64 ip_oldflags; 182f062abf0SLi Zefan unsigned int i_oldflags; 1836cbff00fSChristoph Hellwig 184b83cc969SLi Zefan if (btrfs_root_readonly(root)) 185b83cc969SLi Zefan return -EROFS; 186b83cc969SLi Zefan 1876cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1886cbff00fSChristoph Hellwig return -EFAULT; 1896cbff00fSChristoph Hellwig 19075e7cb7fSLiu Bo ret = check_flags(flags); 19175e7cb7fSLiu Bo if (ret) 19275e7cb7fSLiu Bo return ret; 1936cbff00fSChristoph Hellwig 1942e149670SSerge E. Hallyn if (!inode_owner_or_capable(inode)) 1956cbff00fSChristoph Hellwig return -EACCES; 1966cbff00fSChristoph Hellwig 1976cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 1986cbff00fSChristoph Hellwig 199f062abf0SLi Zefan ip_oldflags = ip->flags; 200f062abf0SLi Zefan i_oldflags = inode->i_flags; 201f062abf0SLi Zefan 2026cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 2036cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 2046cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 2056cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 2066cbff00fSChristoph Hellwig ret = -EPERM; 2076cbff00fSChristoph Hellwig goto out_unlock; 2086cbff00fSChristoph Hellwig } 2096cbff00fSChristoph Hellwig } 2106cbff00fSChristoph Hellwig 211a561be71SAl Viro ret = mnt_want_write_file(file); 2126cbff00fSChristoph Hellwig if (ret) 2136cbff00fSChristoph Hellwig goto out_unlock; 2146cbff00fSChristoph Hellwig 2156cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 2166cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 2176cbff00fSChristoph Hellwig else 2186cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2196cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2206cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2216cbff00fSChristoph Hellwig else 2226cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2236cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2246cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2256cbff00fSChristoph Hellwig else 2266cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2276cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2286cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2296cbff00fSChristoph Hellwig else 2306cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2316cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2326cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2336cbff00fSChristoph Hellwig else 2346cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2356cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2366cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2376cbff00fSChristoph Hellwig else 2386cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 239e1e8fb6aSLi Zefan if (flags & FS_NOCOW_FL) 240e1e8fb6aSLi Zefan ip->flags |= BTRFS_INODE_NODATACOW; 241e1e8fb6aSLi Zefan else 242e1e8fb6aSLi Zefan ip->flags &= ~BTRFS_INODE_NODATACOW; 2436cbff00fSChristoph Hellwig 24475e7cb7fSLiu Bo /* 24575e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 24675e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 24775e7cb7fSLiu Bo * things smaller. 24875e7cb7fSLiu Bo */ 24975e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 25075e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 25175e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 25275e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 25375e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 25475e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 255ebcb904dSLi Zefan } else { 256ebcb904dSLi Zefan ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 25775e7cb7fSLiu Bo } 2586cbff00fSChristoph Hellwig 2594da6f1a3SLi Zefan trans = btrfs_start_transaction(root, 1); 260f062abf0SLi Zefan if (IS_ERR(trans)) { 261f062abf0SLi Zefan ret = PTR_ERR(trans); 262f062abf0SLi Zefan goto out_drop; 263f062abf0SLi Zefan } 2646cbff00fSChristoph Hellwig 265306424ccSLi Zefan btrfs_update_iflags(inode); 2660c4d2d95SJosef Bacik inode_inc_iversion(inode); 267306424ccSLi Zefan inode->i_ctime = CURRENT_TIME; 2686cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 2696cbff00fSChristoph Hellwig 2706cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 271f062abf0SLi Zefan out_drop: 272f062abf0SLi Zefan if (ret) { 273f062abf0SLi Zefan ip->flags = ip_oldflags; 274f062abf0SLi Zefan inode->i_flags = i_oldflags; 275f062abf0SLi Zefan } 2766cbff00fSChristoph Hellwig 2772a79f17eSAl Viro mnt_drop_write_file(file); 2786cbff00fSChristoph Hellwig out_unlock: 2796cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 2802d4e6f6aSliubo return ret; 2816cbff00fSChristoph Hellwig } 2826cbff00fSChristoph Hellwig 2836cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 2846cbff00fSChristoph Hellwig { 2856cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 2866cbff00fSChristoph Hellwig 2876cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 2886cbff00fSChristoph Hellwig } 289f46b5a66SChristoph Hellwig 290f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 291f7039b1dSLi Dongyang { 292815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(fdentry(file)->d_sb); 293f7039b1dSLi Dongyang struct btrfs_device *device; 294f7039b1dSLi Dongyang struct request_queue *q; 295f7039b1dSLi Dongyang struct fstrim_range range; 296f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 297f7039b1dSLi Dongyang u64 num_devices = 0; 298815745cfSAl Viro u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); 299f7039b1dSLi Dongyang int ret; 300f7039b1dSLi Dongyang 301f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 302f7039b1dSLi Dongyang return -EPERM; 303f7039b1dSLi Dongyang 3041f78160cSXiao Guangrong rcu_read_lock(); 3051f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 3061f78160cSXiao Guangrong dev_list) { 307f7039b1dSLi Dongyang if (!device->bdev) 308f7039b1dSLi Dongyang continue; 309f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 310f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 311f7039b1dSLi Dongyang num_devices++; 312f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 313f7039b1dSLi Dongyang minlen); 314f7039b1dSLi Dongyang } 315f7039b1dSLi Dongyang } 3161f78160cSXiao Guangrong rcu_read_unlock(); 317f4c697e6SLukas Czerner 318f7039b1dSLi Dongyang if (!num_devices) 319f7039b1dSLi Dongyang return -EOPNOTSUPP; 320f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 321f7039b1dSLi Dongyang return -EFAULT; 322f4c697e6SLukas Czerner if (range.start > total_bytes) 323f4c697e6SLukas Czerner return -EINVAL; 324f7039b1dSLi Dongyang 325f4c697e6SLukas Czerner range.len = min(range.len, total_bytes - range.start); 326f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 327815745cfSAl Viro ret = btrfs_trim_fs(fs_info->tree_root, &range); 328f7039b1dSLi Dongyang if (ret < 0) 329f7039b1dSLi Dongyang return ret; 330f7039b1dSLi Dongyang 331f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 332f7039b1dSLi Dongyang return -EFAULT; 333f7039b1dSLi Dongyang 334f7039b1dSLi Dongyang return 0; 335f7039b1dSLi Dongyang } 336f7039b1dSLi Dongyang 337cb8e7090SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, 338cb8e7090SChristoph Hellwig struct dentry *dentry, 33972fd032eSSage Weil char *name, int namelen, 34072fd032eSSage Weil u64 *async_transid) 341f46b5a66SChristoph Hellwig { 342f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 343f46b5a66SChristoph Hellwig struct btrfs_key key; 344f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 345f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 346f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 34776dda93cSYan, Zheng struct btrfs_root *new_root; 3482fbe8c8aSAl Viro struct dentry *parent = dentry->d_parent; 3496a912213SJosef Bacik struct inode *dir; 3508ea05e3aSAlexander Block struct timespec cur_time = CURRENT_TIME; 351f46b5a66SChristoph Hellwig int ret; 352f46b5a66SChristoph Hellwig int err; 353f46b5a66SChristoph Hellwig u64 objectid; 354f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 3553de4586cSChris Mason u64 index = 0; 3568ea05e3aSAlexander Block uuid_le new_uuid; 357f46b5a66SChristoph Hellwig 358581bb050SLi Zefan ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); 3592fbe8c8aSAl Viro if (ret) 360a22285a6SYan, Zheng return ret; 3616a912213SJosef Bacik 3626a912213SJosef Bacik dir = parent->d_inode; 3636a912213SJosef Bacik 3649ed74f2dSJosef Bacik /* 3659ed74f2dSJosef Bacik * 1 - inode item 3669ed74f2dSJosef Bacik * 2 - refs 3679ed74f2dSJosef Bacik * 1 - root item 3689ed74f2dSJosef Bacik * 2 - dir items 3699ed74f2dSJosef Bacik */ 370a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 6); 3712fbe8c8aSAl Viro if (IS_ERR(trans)) 372a22285a6SYan, Zheng return PTR_ERR(trans); 373f46b5a66SChristoph Hellwig 3745d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 3755581a51aSJan Schmidt 0, objectid, NULL, 0, 0, 0); 3768e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 3778e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 3788e8a1e31SJosef Bacik goto fail; 3798e8a1e31SJosef Bacik } 380f46b5a66SChristoph Hellwig 3815d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 382f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 383f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 3845d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 385f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 386f46b5a66SChristoph Hellwig 387f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 388f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 389f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 3905d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 3915d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 3925d4f98a2SYan Zheng BTRFS_UUID_SIZE); 393f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 394f46b5a66SChristoph Hellwig 3958ea05e3aSAlexander Block memset(&root_item, 0, sizeof(root_item)); 3968ea05e3aSAlexander Block 397f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 398f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 399f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 400f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 401a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 402f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 403f46b5a66SChristoph Hellwig 40408fe4db1SLi Zefan root_item.flags = 0; 40508fe4db1SLi Zefan root_item.byte_limit = 0; 40608fe4db1SLi Zefan inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT); 40708fe4db1SLi Zefan 408f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 40984234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 410f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 411f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 41286b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 41380ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 414f46b5a66SChristoph Hellwig 4158ea05e3aSAlexander Block btrfs_set_root_generation_v2(&root_item, 4168ea05e3aSAlexander Block btrfs_root_generation(&root_item)); 4178ea05e3aSAlexander Block uuid_le_gen(&new_uuid); 4188ea05e3aSAlexander Block memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); 4198ea05e3aSAlexander Block root_item.otime.sec = cpu_to_le64(cur_time.tv_sec); 4208ea05e3aSAlexander Block root_item.otime.nsec = cpu_to_le64(cur_time.tv_nsec); 4218ea05e3aSAlexander Block root_item.ctime = root_item.otime; 4228ea05e3aSAlexander Block btrfs_set_root_ctransid(&root_item, trans->transid); 4238ea05e3aSAlexander Block btrfs_set_root_otransid(&root_item, trans->transid); 424f46b5a66SChristoph Hellwig 425925baeddSChris Mason btrfs_tree_unlock(leaf); 426f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 427f46b5a66SChristoph Hellwig leaf = NULL; 428f46b5a66SChristoph Hellwig 429f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 430f46b5a66SChristoph Hellwig 431f46b5a66SChristoph Hellwig key.objectid = objectid; 4325d4f98a2SYan Zheng key.offset = 0; 433f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 434f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 435f46b5a66SChristoph Hellwig &root_item); 436f46b5a66SChristoph Hellwig if (ret) 437f46b5a66SChristoph Hellwig goto fail; 438f46b5a66SChristoph Hellwig 43976dda93cSYan, Zheng key.offset = (u64)-1; 44076dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 44179787eaaSJeff Mahoney if (IS_ERR(new_root)) { 44279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); 44379787eaaSJeff Mahoney ret = PTR_ERR(new_root); 44479787eaaSJeff Mahoney goto fail; 44579787eaaSJeff Mahoney } 44676dda93cSYan, Zheng 44776dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 44876dda93cSYan, Zheng 449d82a6f1dSJosef Bacik ret = btrfs_create_subvol_root(trans, new_root, new_dirid); 450ce598979SMark Fasheh if (ret) { 451ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 45279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 453ce598979SMark Fasheh goto fail; 454ce598979SMark Fasheh } 455ce598979SMark Fasheh 456f46b5a66SChristoph Hellwig /* 457f46b5a66SChristoph Hellwig * insert the directory item 458f46b5a66SChristoph Hellwig */ 4593de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 46079787eaaSJeff Mahoney if (ret) { 46179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 46279787eaaSJeff Mahoney goto fail; 46379787eaaSJeff Mahoney } 4643de4586cSChris Mason 4653de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 46616cdcec7SMiao Xie name, namelen, dir, &key, 4673de4586cSChris Mason BTRFS_FT_DIR, index); 46879787eaaSJeff Mahoney if (ret) { 46979787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 470f46b5a66SChristoph Hellwig goto fail; 47179787eaaSJeff Mahoney } 4720660b5afSChris Mason 47352c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 47452c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 47552c26179SYan Zheng BUG_ON(ret); 47652c26179SYan Zheng 4770660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 4784df27c4dSYan, Zheng objectid, root->root_key.objectid, 47933345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 48076dda93cSYan, Zheng 4810660b5afSChris Mason BUG_ON(ret); 4820660b5afSChris Mason 48376dda93cSYan, Zheng d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 484f46b5a66SChristoph Hellwig fail: 48572fd032eSSage Weil if (async_transid) { 48672fd032eSSage Weil *async_transid = trans->transid; 48772fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 48872fd032eSSage Weil } else { 48976dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 49072fd032eSSage Weil } 491f46b5a66SChristoph Hellwig if (err && !ret) 492f46b5a66SChristoph Hellwig ret = err; 493f46b5a66SChristoph Hellwig return ret; 494f46b5a66SChristoph Hellwig } 495f46b5a66SChristoph Hellwig 49672fd032eSSage Weil static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 497b83cc969SLi Zefan char *name, int namelen, u64 *async_transid, 498b83cc969SLi Zefan bool readonly) 499f46b5a66SChristoph Hellwig { 5002e4bfab9SYan, Zheng struct inode *inode; 501f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 502f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 5032e4bfab9SYan, Zheng int ret; 504f46b5a66SChristoph Hellwig 505f46b5a66SChristoph Hellwig if (!root->ref_cows) 506f46b5a66SChristoph Hellwig return -EINVAL; 507f46b5a66SChristoph Hellwig 508a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 509a22285a6SYan, Zheng if (!pending_snapshot) 510a22285a6SYan, Zheng return -ENOMEM; 511a22285a6SYan, Zheng 512a22285a6SYan, Zheng btrfs_init_block_rsv(&pending_snapshot->block_rsv); 513a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 514a22285a6SYan, Zheng pending_snapshot->root = root; 515b83cc969SLi Zefan pending_snapshot->readonly = readonly; 516a22285a6SYan, Zheng 517a22285a6SYan, Zheng trans = btrfs_start_transaction(root->fs_info->extent_root, 5); 518a22285a6SYan, Zheng if (IS_ERR(trans)) { 519a22285a6SYan, Zheng ret = PTR_ERR(trans); 520a22285a6SYan, Zheng goto fail; 521a22285a6SYan, Zheng } 522a22285a6SYan, Zheng 523a22285a6SYan, Zheng ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); 524a22285a6SYan, Zheng BUG_ON(ret); 525a22285a6SYan, Zheng 5268351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 527a22285a6SYan, Zheng list_add(&pending_snapshot->list, 528a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 5298351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 53072fd032eSSage Weil if (async_transid) { 53172fd032eSSage Weil *async_transid = trans->transid; 53272fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 53372fd032eSSage Weil root->fs_info->extent_root, 1); 53472fd032eSSage Weil } else { 53572fd032eSSage Weil ret = btrfs_commit_transaction(trans, 53672fd032eSSage Weil root->fs_info->extent_root); 53772fd032eSSage Weil } 538a22285a6SYan, Zheng BUG_ON(ret); 539a22285a6SYan, Zheng 540a22285a6SYan, Zheng ret = pending_snapshot->error; 541f46b5a66SChristoph Hellwig if (ret) 5422e4bfab9SYan, Zheng goto fail; 543f46b5a66SChristoph Hellwig 54466b4ffd1SJosef Bacik ret = btrfs_orphan_cleanup(pending_snapshot->snap); 54566b4ffd1SJosef Bacik if (ret) 54666b4ffd1SJosef Bacik goto fail; 547f46b5a66SChristoph Hellwig 5482fbe8c8aSAl Viro inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 5492e4bfab9SYan, Zheng if (IS_ERR(inode)) { 5502e4bfab9SYan, Zheng ret = PTR_ERR(inode); 5512e4bfab9SYan, Zheng goto fail; 5522e4bfab9SYan, Zheng } 5532e4bfab9SYan, Zheng BUG_ON(!inode); 5542e4bfab9SYan, Zheng d_instantiate(dentry, inode); 5552e4bfab9SYan, Zheng ret = 0; 5562e4bfab9SYan, Zheng fail: 557a22285a6SYan, Zheng kfree(pending_snapshot); 558f46b5a66SChristoph Hellwig return ret; 559f46b5a66SChristoph Hellwig } 560f46b5a66SChristoph Hellwig 5614260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 5624260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 5634260f7c7SSage Weil * minimal. 5644260f7c7SSage Weil */ 5654260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 5664260f7c7SSage Weil { 5674260f7c7SSage Weil uid_t fsuid = current_fsuid(); 5684260f7c7SSage Weil 5694260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 5704260f7c7SSage Weil return 0; 5714260f7c7SSage Weil if (inode->i_uid == fsuid) 5724260f7c7SSage Weil return 0; 5734260f7c7SSage Weil if (dir->i_uid == fsuid) 5744260f7c7SSage Weil return 0; 5754260f7c7SSage Weil return !capable(CAP_FOWNER); 5764260f7c7SSage Weil } 5774260f7c7SSage Weil 5784260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 5794260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 5804260f7c7SSage Weil * whether the type of victim is right. 5814260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 5824260f7c7SSage Weil * 2. We should have write and exec permissions on dir 5834260f7c7SSage Weil * 3. We can't remove anything from append-only dir 5844260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 5854260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 5864260f7c7SSage Weil * a. be owner of dir, or 5874260f7c7SSage Weil * b. be owner of victim, or 5884260f7c7SSage Weil * c. have CAP_FOWNER capability 5894260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 5904260f7c7SSage Weil * links pointing to it. 5914260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 5924260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 5934260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 5944260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 5954260f7c7SSage Weil * nfs_async_unlink(). 5964260f7c7SSage Weil */ 5974260f7c7SSage Weil 5984260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) 5994260f7c7SSage Weil { 6004260f7c7SSage Weil int error; 6014260f7c7SSage Weil 6024260f7c7SSage Weil if (!victim->d_inode) 6034260f7c7SSage Weil return -ENOENT; 6044260f7c7SSage Weil 6054260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 6064260f7c7SSage Weil audit_inode_child(victim, dir); 6074260f7c7SSage Weil 6084260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 6094260f7c7SSage Weil if (error) 6104260f7c7SSage Weil return error; 6114260f7c7SSage Weil if (IS_APPEND(dir)) 6124260f7c7SSage Weil return -EPERM; 6134260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 6144260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 6154260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 6164260f7c7SSage Weil return -EPERM; 6174260f7c7SSage Weil if (isdir) { 6184260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 6194260f7c7SSage Weil return -ENOTDIR; 6204260f7c7SSage Weil if (IS_ROOT(victim)) 6214260f7c7SSage Weil return -EBUSY; 6224260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 6234260f7c7SSage Weil return -EISDIR; 6244260f7c7SSage Weil if (IS_DEADDIR(dir)) 6254260f7c7SSage Weil return -ENOENT; 6264260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 6274260f7c7SSage Weil return -EBUSY; 6284260f7c7SSage Weil return 0; 6294260f7c7SSage Weil } 6304260f7c7SSage Weil 631cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 632cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 633cb8e7090SChristoph Hellwig { 634cb8e7090SChristoph Hellwig if (child->d_inode) 635cb8e7090SChristoph Hellwig return -EEXIST; 636cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 637cb8e7090SChristoph Hellwig return -ENOENT; 638cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 639cb8e7090SChristoph Hellwig } 640cb8e7090SChristoph Hellwig 641cb8e7090SChristoph Hellwig /* 642cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 643cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 644cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 645cb8e7090SChristoph Hellwig */ 64676dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 64776dda93cSYan, Zheng char *name, int namelen, 64872fd032eSSage Weil struct btrfs_root *snap_src, 649b83cc969SLi Zefan u64 *async_transid, bool readonly) 650cb8e7090SChristoph Hellwig { 65176dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 652cb8e7090SChristoph Hellwig struct dentry *dentry; 653cb8e7090SChristoph Hellwig int error; 654cb8e7090SChristoph Hellwig 65576dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 656cb8e7090SChristoph Hellwig 657cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 658cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 659cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 660cb8e7090SChristoph Hellwig goto out_unlock; 661cb8e7090SChristoph Hellwig 662cb8e7090SChristoph Hellwig error = -EEXIST; 663cb8e7090SChristoph Hellwig if (dentry->d_inode) 664cb8e7090SChristoph Hellwig goto out_dput; 665cb8e7090SChristoph Hellwig 666cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 667cb8e7090SChristoph Hellwig if (error) 668cb8e7090SChristoph Hellwig goto out_dput; 669cb8e7090SChristoph Hellwig 67076dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 671cb8e7090SChristoph Hellwig if (error) 672cb8e7090SChristoph Hellwig goto out_drop_write; 673cb8e7090SChristoph Hellwig 67476dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 67576dda93cSYan, Zheng 67676dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 67776dda93cSYan, Zheng goto out_up_read; 67876dda93cSYan, Zheng 6793de4586cSChris Mason if (snap_src) { 68072fd032eSSage Weil error = create_snapshot(snap_src, dentry, 681b83cc969SLi Zefan name, namelen, async_transid, readonly); 6823de4586cSChris Mason } else { 68376dda93cSYan, Zheng error = create_subvol(BTRFS_I(dir)->root, dentry, 68472fd032eSSage Weil name, namelen, async_transid); 6853de4586cSChris Mason } 68676dda93cSYan, Zheng if (!error) 68776dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 68876dda93cSYan, Zheng out_up_read: 68976dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 690cb8e7090SChristoph Hellwig out_drop_write: 691cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 692cb8e7090SChristoph Hellwig out_dput: 693cb8e7090SChristoph Hellwig dput(dentry); 694cb8e7090SChristoph Hellwig out_unlock: 69576dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 696cb8e7090SChristoph Hellwig return error; 697cb8e7090SChristoph Hellwig } 698cb8e7090SChristoph Hellwig 6994cb5300bSChris Mason /* 7004cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 7014cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 7024cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 7034cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 7044cb5300bSChris Mason * part of the file 7054cb5300bSChris Mason */ 7064cb5300bSChris Mason static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) 7074cb5300bSChris Mason { 7084cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 7094cb5300bSChris Mason struct extent_map *em = NULL; 7104cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 7114cb5300bSChris Mason u64 end; 7124cb5300bSChris Mason 7134cb5300bSChris Mason read_lock(&em_tree->lock); 7144cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 7154cb5300bSChris Mason read_unlock(&em_tree->lock); 7164cb5300bSChris Mason 7174cb5300bSChris Mason if (em) { 7184cb5300bSChris Mason end = extent_map_end(em); 7194cb5300bSChris Mason free_extent_map(em); 7204cb5300bSChris Mason if (end - offset > thresh) 7214cb5300bSChris Mason return 0; 7224cb5300bSChris Mason } 7234cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 7244cb5300bSChris Mason thresh /= 2; 7254cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 7264cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 7274cb5300bSChris Mason if (end >= thresh) 7284cb5300bSChris Mason return 0; 7294cb5300bSChris Mason return 1; 7304cb5300bSChris Mason } 7314cb5300bSChris Mason 7324cb5300bSChris Mason /* 7334cb5300bSChris Mason * helper function to walk through a file and find extents 7344cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 7354cb5300bSChris Mason * 7364cb5300bSChris Mason * This is used by the defragging code to find new and small 7374cb5300bSChris Mason * extents 7384cb5300bSChris Mason */ 7394cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 7404cb5300bSChris Mason struct inode *inode, u64 newer_than, 7414cb5300bSChris Mason u64 *off, int thresh) 7424cb5300bSChris Mason { 7434cb5300bSChris Mason struct btrfs_path *path; 7444cb5300bSChris Mason struct btrfs_key min_key; 7454cb5300bSChris Mason struct btrfs_key max_key; 7464cb5300bSChris Mason struct extent_buffer *leaf; 7474cb5300bSChris Mason struct btrfs_file_extent_item *extent; 7484cb5300bSChris Mason int type; 7494cb5300bSChris Mason int ret; 750a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 7514cb5300bSChris Mason 7524cb5300bSChris Mason path = btrfs_alloc_path(); 7534cb5300bSChris Mason if (!path) 7544cb5300bSChris Mason return -ENOMEM; 7554cb5300bSChris Mason 756a4689d2bSDavid Sterba min_key.objectid = ino; 7574cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 7584cb5300bSChris Mason min_key.offset = *off; 7594cb5300bSChris Mason 760a4689d2bSDavid Sterba max_key.objectid = ino; 7614cb5300bSChris Mason max_key.type = (u8)-1; 7624cb5300bSChris Mason max_key.offset = (u64)-1; 7634cb5300bSChris Mason 7644cb5300bSChris Mason path->keep_locks = 1; 7654cb5300bSChris Mason 7664cb5300bSChris Mason while(1) { 7674cb5300bSChris Mason ret = btrfs_search_forward(root, &min_key, &max_key, 7684cb5300bSChris Mason path, 0, newer_than); 7694cb5300bSChris Mason if (ret != 0) 7704cb5300bSChris Mason goto none; 771a4689d2bSDavid Sterba if (min_key.objectid != ino) 7724cb5300bSChris Mason goto none; 7734cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 7744cb5300bSChris Mason goto none; 7754cb5300bSChris Mason 7764cb5300bSChris Mason leaf = path->nodes[0]; 7774cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 7784cb5300bSChris Mason struct btrfs_file_extent_item); 7794cb5300bSChris Mason 7804cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 7814cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 7824cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 7834cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 7844cb5300bSChris Mason *off = min_key.offset; 7854cb5300bSChris Mason btrfs_free_path(path); 7864cb5300bSChris Mason return 0; 7874cb5300bSChris Mason } 7884cb5300bSChris Mason 7894cb5300bSChris Mason if (min_key.offset == (u64)-1) 7904cb5300bSChris Mason goto none; 7914cb5300bSChris Mason 7924cb5300bSChris Mason min_key.offset++; 7934cb5300bSChris Mason btrfs_release_path(path); 7944cb5300bSChris Mason } 7954cb5300bSChris Mason none: 7964cb5300bSChris Mason btrfs_free_path(path); 7974cb5300bSChris Mason return -ENOENT; 7984cb5300bSChris Mason } 7994cb5300bSChris Mason 8006c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 80117ce6ef8SLiu Bo { 80217ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 803940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8046c282eb4SLi Zefan struct extent_map *em; 8056c282eb4SLi Zefan u64 len = PAGE_CACHE_SIZE; 806940100a4SChris Mason 807940100a4SChris Mason /* 808940100a4SChris Mason * hopefully we have this extent in the tree already, try without 809940100a4SChris Mason * the full extent lock 810940100a4SChris Mason */ 811940100a4SChris Mason read_lock(&em_tree->lock); 812940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 813940100a4SChris Mason read_unlock(&em_tree->lock); 814940100a4SChris Mason 815940100a4SChris Mason if (!em) { 816940100a4SChris Mason /* get the big lock and read metadata off disk */ 817d0082371SJeff Mahoney lock_extent(io_tree, start, start + len - 1); 818940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 819d0082371SJeff Mahoney unlock_extent(io_tree, start, start + len - 1); 820940100a4SChris Mason 8216cf8bfbfSDan Carpenter if (IS_ERR(em)) 8226c282eb4SLi Zefan return NULL; 823940100a4SChris Mason } 824940100a4SChris Mason 8256c282eb4SLi Zefan return em; 8266c282eb4SLi Zefan } 8276c282eb4SLi Zefan 8286c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 8296c282eb4SLi Zefan { 8306c282eb4SLi Zefan struct extent_map *next; 8316c282eb4SLi Zefan bool ret = true; 8326c282eb4SLi Zefan 8336c282eb4SLi Zefan /* this is the last extent */ 8346c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 8356c282eb4SLi Zefan return false; 8366c282eb4SLi Zefan 8376c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 8386c282eb4SLi Zefan if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 8396c282eb4SLi Zefan ret = false; 8406c282eb4SLi Zefan 8416c282eb4SLi Zefan free_extent_map(next); 8426c282eb4SLi Zefan return ret; 8436c282eb4SLi Zefan } 8446c282eb4SLi Zefan 8456c282eb4SLi Zefan static int should_defrag_range(struct inode *inode, u64 start, int thresh, 8466c282eb4SLi Zefan u64 *last_len, u64 *skip, u64 *defrag_end) 8476c282eb4SLi Zefan { 8486c282eb4SLi Zefan struct extent_map *em; 8496c282eb4SLi Zefan int ret = 1; 8506c282eb4SLi Zefan bool next_mergeable = true; 8516c282eb4SLi Zefan 8526c282eb4SLi Zefan /* 8536c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 8546c282eb4SLi Zefan * defragging it 8556c282eb4SLi Zefan */ 8566c282eb4SLi Zefan if (start < *defrag_end) 8576c282eb4SLi Zefan return 1; 8586c282eb4SLi Zefan 8596c282eb4SLi Zefan *skip = 0; 8606c282eb4SLi Zefan 8616c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 8626c282eb4SLi Zefan if (!em) 8636c282eb4SLi Zefan return 0; 8646c282eb4SLi Zefan 865940100a4SChris Mason /* this will cover holes, and inline extents */ 86617ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 867940100a4SChris Mason ret = 0; 86817ce6ef8SLiu Bo goto out; 86917ce6ef8SLiu Bo } 87017ce6ef8SLiu Bo 8716c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 872940100a4SChris Mason 873940100a4SChris Mason /* 8746c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 8756c282eb4SLi Zefan * real extent, don't bother defragging it 876940100a4SChris Mason */ 8776c282eb4SLi Zefan if ((*last_len == 0 || *last_len >= thresh) && 8786c282eb4SLi Zefan (em->len >= thresh || !next_mergeable)) 879940100a4SChris Mason ret = 0; 88017ce6ef8SLiu Bo out: 881940100a4SChris Mason /* 882940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 883940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 884940100a4SChris Mason * so that the next tiny extent will force a defrag. 885940100a4SChris Mason * 886940100a4SChris Mason * The end result of this is that tiny extents before a single big 887940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 888940100a4SChris Mason */ 889940100a4SChris Mason if (ret) { 890940100a4SChris Mason *defrag_end = extent_map_end(em); 891940100a4SChris Mason } else { 892940100a4SChris Mason *last_len = 0; 893940100a4SChris Mason *skip = extent_map_end(em); 894940100a4SChris Mason *defrag_end = 0; 895940100a4SChris Mason } 896940100a4SChris Mason 897940100a4SChris Mason free_extent_map(em); 898940100a4SChris Mason return ret; 899940100a4SChris Mason } 900940100a4SChris Mason 9014cb5300bSChris Mason /* 9024cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 9034cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 9044cb5300bSChris Mason * to COW and defrag. 9054cb5300bSChris Mason * 9064cb5300bSChris Mason * It also makes sure the delalloc code has enough 9074cb5300bSChris Mason * dirty data to avoid making new small extents as part 9084cb5300bSChris Mason * of the defrag 9094cb5300bSChris Mason * 9104cb5300bSChris Mason * It's a good idea to start RA on this range 9114cb5300bSChris Mason * before calling this. 9124cb5300bSChris Mason */ 9134cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 9144cb5300bSChris Mason struct page **pages, 9154cb5300bSChris Mason unsigned long start_index, 9164cb5300bSChris Mason int num_pages) 917f46b5a66SChristoph Hellwig { 9184cb5300bSChris Mason unsigned long file_end; 9194cb5300bSChris Mason u64 isize = i_size_read(inode); 920f46b5a66SChristoph Hellwig u64 page_start; 921f46b5a66SChristoph Hellwig u64 page_end; 9221f12bd06SLiu Bo u64 page_cnt; 9234cb5300bSChris Mason int ret; 9244cb5300bSChris Mason int i; 9254cb5300bSChris Mason int i_done; 9264cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 9274cb5300bSChris Mason struct extent_state *cached_state = NULL; 928600a45e1SMiao Xie struct extent_io_tree *tree; 9293b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 9304cb5300bSChris Mason 9314cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 9321f12bd06SLiu Bo if (!isize || start_index > file_end) 9331f12bd06SLiu Bo return 0; 9341f12bd06SLiu Bo 9351f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 9364cb5300bSChris Mason 9374cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 9381f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 9394cb5300bSChris Mason if (ret) 9404cb5300bSChris Mason return ret; 9414cb5300bSChris Mason i_done = 0; 942600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 9434cb5300bSChris Mason 9444cb5300bSChris Mason /* step one, lock all the pages */ 9451f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 9464cb5300bSChris Mason struct page *page; 947600a45e1SMiao Xie again: 948a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 9493b16a4e3SJosef Bacik start_index + i, mask); 9504cb5300bSChris Mason if (!page) 9514cb5300bSChris Mason break; 9524cb5300bSChris Mason 953600a45e1SMiao Xie page_start = page_offset(page); 954600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 955600a45e1SMiao Xie while (1) { 956d0082371SJeff Mahoney lock_extent(tree, page_start, page_end); 957600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 958600a45e1SMiao Xie page_start); 959d0082371SJeff Mahoney unlock_extent(tree, page_start, page_end); 960600a45e1SMiao Xie if (!ordered) 961600a45e1SMiao Xie break; 962600a45e1SMiao Xie 963600a45e1SMiao Xie unlock_page(page); 964600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 965600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 966600a45e1SMiao Xie lock_page(page); 9671f12bd06SLiu Bo /* 9681f12bd06SLiu Bo * we unlocked the page above, so we need check if 9691f12bd06SLiu Bo * it was released or not. 9701f12bd06SLiu Bo */ 9711f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 9721f12bd06SLiu Bo unlock_page(page); 9731f12bd06SLiu Bo page_cache_release(page); 9741f12bd06SLiu Bo goto again; 9751f12bd06SLiu Bo } 976600a45e1SMiao Xie } 977600a45e1SMiao Xie 9784cb5300bSChris Mason if (!PageUptodate(page)) { 9794cb5300bSChris Mason btrfs_readpage(NULL, page); 9804cb5300bSChris Mason lock_page(page); 9814cb5300bSChris Mason if (!PageUptodate(page)) { 9824cb5300bSChris Mason unlock_page(page); 9834cb5300bSChris Mason page_cache_release(page); 9844cb5300bSChris Mason ret = -EIO; 9854cb5300bSChris Mason break; 9864cb5300bSChris Mason } 9874cb5300bSChris Mason } 988600a45e1SMiao Xie 989600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 990600a45e1SMiao Xie unlock_page(page); 991600a45e1SMiao Xie page_cache_release(page); 992600a45e1SMiao Xie goto again; 993600a45e1SMiao Xie } 994600a45e1SMiao Xie 9954cb5300bSChris Mason pages[i] = page; 9964cb5300bSChris Mason i_done++; 9974cb5300bSChris Mason } 9984cb5300bSChris Mason if (!i_done || ret) 9994cb5300bSChris Mason goto out; 10004cb5300bSChris Mason 10014cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 10024cb5300bSChris Mason goto out; 10034cb5300bSChris Mason 10044cb5300bSChris Mason /* 10054cb5300bSChris Mason * so now we have a nice long stream of locked 10064cb5300bSChris Mason * and up to date pages, lets wait on them 10074cb5300bSChris Mason */ 10084cb5300bSChris Mason for (i = 0; i < i_done; i++) 10094cb5300bSChris Mason wait_on_page_writeback(pages[i]); 10104cb5300bSChris Mason 10114cb5300bSChris Mason page_start = page_offset(pages[0]); 10124cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 10134cb5300bSChris Mason 10144cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1015d0082371SJeff Mahoney page_start, page_end - 1, 0, &cached_state); 10164cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 10174cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 10184cb5300bSChris Mason EXTENT_DO_ACCOUNTING, 0, 0, &cached_state, 10194cb5300bSChris Mason GFP_NOFS); 10204cb5300bSChris Mason 10211f12bd06SLiu Bo if (i_done != page_cnt) { 10229e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 10239e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 10249e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 10254cb5300bSChris Mason btrfs_delalloc_release_space(inode, 10261f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 10274cb5300bSChris Mason } 10284cb5300bSChris Mason 10294cb5300bSChris Mason 10304cb5300bSChris Mason btrfs_set_extent_delalloc(inode, page_start, page_end - 1, 10314cb5300bSChris Mason &cached_state); 10324cb5300bSChris Mason 10334cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 10344cb5300bSChris Mason page_start, page_end - 1, &cached_state, 10354cb5300bSChris Mason GFP_NOFS); 10364cb5300bSChris Mason 10374cb5300bSChris Mason for (i = 0; i < i_done; i++) { 10384cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 10394cb5300bSChris Mason ClearPageChecked(pages[i]); 10404cb5300bSChris Mason set_page_extent_mapped(pages[i]); 10414cb5300bSChris Mason set_page_dirty(pages[i]); 10424cb5300bSChris Mason unlock_page(pages[i]); 10434cb5300bSChris Mason page_cache_release(pages[i]); 10444cb5300bSChris Mason } 10454cb5300bSChris Mason return i_done; 10464cb5300bSChris Mason out: 10474cb5300bSChris Mason for (i = 0; i < i_done; i++) { 10484cb5300bSChris Mason unlock_page(pages[i]); 10494cb5300bSChris Mason page_cache_release(pages[i]); 10504cb5300bSChris Mason } 10511f12bd06SLiu Bo btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); 10524cb5300bSChris Mason return ret; 10534cb5300bSChris Mason 10544cb5300bSChris Mason } 10554cb5300bSChris Mason 10564cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 10574cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 10584cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 10594cb5300bSChris Mason { 10604cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 10614cb5300bSChris Mason struct btrfs_super_block *disk_super; 10624cb5300bSChris Mason struct file_ra_state *ra = NULL; 10634cb5300bSChris Mason unsigned long last_index; 1064151a31b2SLi Zefan u64 isize = i_size_read(inode); 10654cb5300bSChris Mason u64 features; 1066940100a4SChris Mason u64 last_len = 0; 1067940100a4SChris Mason u64 skip = 0; 1068940100a4SChris Mason u64 defrag_end = 0; 10694cb5300bSChris Mason u64 newer_off = range->start; 1070f46b5a66SChristoph Hellwig unsigned long i; 1071008873eaSLi Zefan unsigned long ra_index = 0; 1072f46b5a66SChristoph Hellwig int ret; 10734cb5300bSChris Mason int defrag_count = 0; 10741a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 10754cb5300bSChris Mason int extent_thresh = range->extent_thresh; 1076008873eaSLi Zefan int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; 1077008873eaSLi Zefan int cluster = max_cluster; 10784cb5300bSChris Mason u64 new_align = ~((u64)128 * 1024 - 1); 10794cb5300bSChris Mason struct page **pages = NULL; 10804cb5300bSChris Mason 10814cb5300bSChris Mason if (extent_thresh == 0) 10824cb5300bSChris Mason extent_thresh = 256 * 1024; 10831a419d85SLi Zefan 10841a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 10851a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 10861a419d85SLi Zefan return -EINVAL; 10871a419d85SLi Zefan if (range->compress_type) 10881a419d85SLi Zefan compress_type = range->compress_type; 10891a419d85SLi Zefan } 1090f46b5a66SChristoph Hellwig 1091151a31b2SLi Zefan if (isize == 0) 1092940100a4SChris Mason return 0; 1093f46b5a66SChristoph Hellwig 10944cb5300bSChris Mason /* 10954cb5300bSChris Mason * if we were not given a file, allocate a readahead 10964cb5300bSChris Mason * context 10974cb5300bSChris Mason */ 10984cb5300bSChris Mason if (!file) { 10994cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 11004cb5300bSChris Mason if (!ra) 11014cb5300bSChris Mason return -ENOMEM; 11024cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 11034cb5300bSChris Mason } else { 11044cb5300bSChris Mason ra = &file->f_ra; 11054cb5300bSChris Mason } 11064cb5300bSChris Mason 1107008873eaSLi Zefan pages = kmalloc(sizeof(struct page *) * max_cluster, 11084cb5300bSChris Mason GFP_NOFS); 11094cb5300bSChris Mason if (!pages) { 11104cb5300bSChris Mason ret = -ENOMEM; 11114cb5300bSChris Mason goto out_ra; 11124cb5300bSChris Mason } 11134cb5300bSChris Mason 11144cb5300bSChris Mason /* find the last page to defrag */ 11151e701a32SChris Mason if (range->start + range->len > range->start) { 1116151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 11171e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 11181e701a32SChris Mason } else { 1119151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 11201e701a32SChris Mason } 11211e701a32SChris Mason 11224cb5300bSChris Mason if (newer_than) { 11234cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 11244cb5300bSChris Mason &newer_off, 64 * 1024); 11254cb5300bSChris Mason if (!ret) { 11264cb5300bSChris Mason range->start = newer_off; 11274cb5300bSChris Mason /* 11284cb5300bSChris Mason * we always align our defrag to help keep 11294cb5300bSChris Mason * the extents in the file evenly spaced 11304cb5300bSChris Mason */ 11314cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 11324cb5300bSChris Mason } else 11334cb5300bSChris Mason goto out_ra; 11344cb5300bSChris Mason } else { 11351e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 11364cb5300bSChris Mason } 11374cb5300bSChris Mason if (!max_to_defrag) 11387ec31b54SLiu Bo max_to_defrag = last_index + 1; 11394cb5300bSChris Mason 11402a0f7f57SLi Zefan /* 11412a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 11422a0f7f57SLi Zefan * written sequentially. 11432a0f7f57SLi Zefan */ 11442a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 11452a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 11462a0f7f57SLi Zefan 1147f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1148f7f43cc8SChris Mason (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> 1149f7f43cc8SChris Mason PAGE_CACHE_SHIFT)) { 11504cb5300bSChris Mason /* 11514cb5300bSChris Mason * make sure we stop running if someone unmounts 11524cb5300bSChris Mason * the FS 11534cb5300bSChris Mason */ 11544cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 11554cb5300bSChris Mason break; 11564cb5300bSChris Mason 115766c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 11586c282eb4SLi Zefan extent_thresh, &last_len, &skip, 11596c282eb4SLi Zefan &defrag_end)) { 1160940100a4SChris Mason unsigned long next; 1161940100a4SChris Mason /* 1162940100a4SChris Mason * the should_defrag function tells us how much to skip 1163940100a4SChris Mason * bump our counter by the suggested amount 1164940100a4SChris Mason */ 1165940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 1166940100a4SChris Mason i = max(i + 1, next); 1167940100a4SChris Mason continue; 1168940100a4SChris Mason } 1169008873eaSLi Zefan 1170008873eaSLi Zefan if (!newer_than) { 1171008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1172008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1173008873eaSLi Zefan cluster = min(cluster, max_cluster); 1174008873eaSLi Zefan } else { 1175008873eaSLi Zefan cluster = max_cluster; 1176008873eaSLi Zefan } 1177008873eaSLi Zefan 11781e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 11791a419d85SLi Zefan BTRFS_I(inode)->force_compress = compress_type; 1180940100a4SChris Mason 1181008873eaSLi Zefan if (i + cluster > ra_index) { 1182008873eaSLi Zefan ra_index = max(i, ra_index); 1183008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1184008873eaSLi Zefan cluster); 1185008873eaSLi Zefan ra_index += max_cluster; 1186008873eaSLi Zefan } 11874cb5300bSChris Mason 1188ecb8bea8SLiu Bo mutex_lock(&inode->i_mutex); 1189008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1190ecb8bea8SLiu Bo if (ret < 0) { 1191ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 11924cb5300bSChris Mason goto out_ra; 1193ecb8bea8SLiu Bo } 11944cb5300bSChris Mason 11954cb5300bSChris Mason defrag_count += ret; 11964cb5300bSChris Mason balance_dirty_pages_ratelimited_nr(inode->i_mapping, ret); 1197ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 11984cb5300bSChris Mason 11994cb5300bSChris Mason if (newer_than) { 12004cb5300bSChris Mason if (newer_off == (u64)-1) 12014cb5300bSChris Mason break; 12024cb5300bSChris Mason 1203e1f041e1SLiu Bo if (ret > 0) 1204e1f041e1SLiu Bo i += ret; 1205e1f041e1SLiu Bo 12064cb5300bSChris Mason newer_off = max(newer_off + 1, 12074cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 12084cb5300bSChris Mason 12094cb5300bSChris Mason ret = find_new_extents(root, inode, 12104cb5300bSChris Mason newer_than, &newer_off, 12114cb5300bSChris Mason 64 * 1024); 12124cb5300bSChris Mason if (!ret) { 12134cb5300bSChris Mason range->start = newer_off; 12144cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 12154cb5300bSChris Mason } else { 12164cb5300bSChris Mason break; 1217940100a4SChris Mason } 12184cb5300bSChris Mason } else { 1219008873eaSLi Zefan if (ret > 0) { 1220cbcc8326SLi Zefan i += ret; 1221008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1222008873eaSLi Zefan } else { 1223940100a4SChris Mason i++; 1224008873eaSLi Zefan last_len = 0; 1225008873eaSLi Zefan } 1226f46b5a66SChristoph Hellwig } 12274cb5300bSChris Mason } 1228f46b5a66SChristoph Hellwig 12291e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 12301e701a32SChris Mason filemap_flush(inode->i_mapping); 12311e701a32SChris Mason 12321e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 12331e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 12341e701a32SChris Mason * we have to make sure the IO is actually started and that 12351e701a32SChris Mason * ordered extents get created before we return 12361e701a32SChris Mason */ 12371e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 12381e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 12391e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 12401e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 12411e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 12421e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 12431e701a32SChris Mason } 12441e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 12451e701a32SChris Mason 12461e701a32SChris Mason mutex_lock(&inode->i_mutex); 1247261507a0SLi Zefan BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 12481e701a32SChris Mason mutex_unlock(&inode->i_mutex); 12491e701a32SChris Mason } 12501e701a32SChris Mason 12516c41761fSDavid Sterba disk_super = root->fs_info->super_copy; 12521a419d85SLi Zefan features = btrfs_super_incompat_flags(disk_super); 12531a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 12541a419d85SLi Zefan features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; 12551a419d85SLi Zefan btrfs_set_super_incompat_flags(disk_super, features); 12561a419d85SLi Zefan } 12571a419d85SLi Zefan 125860ccf82fSDiego Calleja ret = defrag_count; 1259940100a4SChris Mason 12604cb5300bSChris Mason out_ra: 12614cb5300bSChris Mason if (!file) 12624cb5300bSChris Mason kfree(ra); 12634cb5300bSChris Mason kfree(pages); 1264940100a4SChris Mason return ret; 1265f46b5a66SChristoph Hellwig } 1266f46b5a66SChristoph Hellwig 126776dda93cSYan, Zheng static noinline int btrfs_ioctl_resize(struct btrfs_root *root, 126876dda93cSYan, Zheng void __user *arg) 1269f46b5a66SChristoph Hellwig { 1270f46b5a66SChristoph Hellwig u64 new_size; 1271f46b5a66SChristoph Hellwig u64 old_size; 1272f46b5a66SChristoph Hellwig u64 devid = 1; 1273f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1274f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1275f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1276f46b5a66SChristoph Hellwig char *sizestr; 1277f46b5a66SChristoph Hellwig char *devstr = NULL; 1278f46b5a66SChristoph Hellwig int ret = 0; 1279f46b5a66SChristoph Hellwig int mod = 0; 1280f46b5a66SChristoph Hellwig 1281c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1282c146afadSYan Zheng return -EROFS; 1283c146afadSYan Zheng 1284e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1285e441d54dSChris Mason return -EPERM; 1286e441d54dSChris Mason 1287c9e9f97bSIlya Dryomov mutex_lock(&root->fs_info->volume_mutex); 1288c9e9f97bSIlya Dryomov if (root->fs_info->balance_ctl) { 1289c9e9f97bSIlya Dryomov printk(KERN_INFO "btrfs: balance in progress\n"); 1290c9e9f97bSIlya Dryomov ret = -EINVAL; 1291c9e9f97bSIlya Dryomov goto out; 1292c9e9f97bSIlya Dryomov } 1293c9e9f97bSIlya Dryomov 1294dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1295c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1296c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1297c9e9f97bSIlya Dryomov goto out; 1298c9e9f97bSIlya Dryomov } 12995516e595SMark Fasheh 13005516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1301f46b5a66SChristoph Hellwig 1302f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1303f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1304f46b5a66SChristoph Hellwig if (devstr) { 1305f46b5a66SChristoph Hellwig char *end; 1306f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1307f46b5a66SChristoph Hellwig *devstr = '\0'; 1308f46b5a66SChristoph Hellwig devstr = vol_args->name; 1309f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 13105bb14682SArnd Hannemann printk(KERN_INFO "btrfs: resizing devid %llu\n", 131121380931SJoel Becker (unsigned long long)devid); 1312f46b5a66SChristoph Hellwig } 13132b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 1314f46b5a66SChristoph Hellwig if (!device) { 13155bb14682SArnd Hannemann printk(KERN_INFO "btrfs: resizer unable to find device %llu\n", 131621380931SJoel Becker (unsigned long long)devid); 1317f46b5a66SChristoph Hellwig ret = -EINVAL; 1318c9e9f97bSIlya Dryomov goto out_free; 1319f46b5a66SChristoph Hellwig } 13204e42ae1bSLiu Bo if (device->fs_devices && device->fs_devices->seeding) { 13214e42ae1bSLiu Bo printk(KERN_INFO "btrfs: resizer unable to apply on " 1322a8c4a33bSChris Mason "seeding device %llu\n", 1323a8c4a33bSChris Mason (unsigned long long)devid); 13244e42ae1bSLiu Bo ret = -EINVAL; 13254e42ae1bSLiu Bo goto out_free; 13264e42ae1bSLiu Bo } 13274e42ae1bSLiu Bo 1328f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1329f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1330f46b5a66SChristoph Hellwig else { 1331f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1332f46b5a66SChristoph Hellwig mod = -1; 1333f46b5a66SChristoph Hellwig sizestr++; 1334f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1335f46b5a66SChristoph Hellwig mod = 1; 1336f46b5a66SChristoph Hellwig sizestr++; 1337f46b5a66SChristoph Hellwig } 133891748467SAkinobu Mita new_size = memparse(sizestr, NULL); 1339f46b5a66SChristoph Hellwig if (new_size == 0) { 1340f46b5a66SChristoph Hellwig ret = -EINVAL; 1341c9e9f97bSIlya Dryomov goto out_free; 1342f46b5a66SChristoph Hellwig } 1343f46b5a66SChristoph Hellwig } 1344f46b5a66SChristoph Hellwig 1345f46b5a66SChristoph Hellwig old_size = device->total_bytes; 1346f46b5a66SChristoph Hellwig 1347f46b5a66SChristoph Hellwig if (mod < 0) { 1348f46b5a66SChristoph Hellwig if (new_size > old_size) { 1349f46b5a66SChristoph Hellwig ret = -EINVAL; 1350c9e9f97bSIlya Dryomov goto out_free; 1351f46b5a66SChristoph Hellwig } 1352f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1353f46b5a66SChristoph Hellwig } else if (mod > 0) { 1354f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1355f46b5a66SChristoph Hellwig } 1356f46b5a66SChristoph Hellwig 1357f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 1358f46b5a66SChristoph Hellwig ret = -EINVAL; 1359c9e9f97bSIlya Dryomov goto out_free; 1360f46b5a66SChristoph Hellwig } 1361f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1362f46b5a66SChristoph Hellwig ret = -EFBIG; 1363c9e9f97bSIlya Dryomov goto out_free; 1364f46b5a66SChristoph Hellwig } 1365f46b5a66SChristoph Hellwig 1366f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 1367f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1368f46b5a66SChristoph Hellwig 1369606686eeSJosef Bacik printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n", 1370606686eeSJosef Bacik rcu_str_deref(device->name), 1371606686eeSJosef Bacik (unsigned long long)new_size); 1372f46b5a66SChristoph Hellwig 1373f46b5a66SChristoph Hellwig if (new_size > old_size) { 1374a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 137598d5dc13STsutomu Itoh if (IS_ERR(trans)) { 137698d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1377c9e9f97bSIlya Dryomov goto out_free; 137898d5dc13STsutomu Itoh } 1379f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1380f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1381ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1382f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 1383f46b5a66SChristoph Hellwig } 1384f46b5a66SChristoph Hellwig 1385c9e9f97bSIlya Dryomov out_free: 1386f46b5a66SChristoph Hellwig kfree(vol_args); 1387c9e9f97bSIlya Dryomov out: 1388c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 1389f46b5a66SChristoph Hellwig return ret; 1390f46b5a66SChristoph Hellwig } 1391f46b5a66SChristoph Hellwig 139272fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 139372fd032eSSage Weil char *name, 139472fd032eSSage Weil unsigned long fd, 139572fd032eSSage Weil int subvol, 1396b83cc969SLi Zefan u64 *transid, 1397b83cc969SLi Zefan bool readonly) 1398f46b5a66SChristoph Hellwig { 1399cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 14003de4586cSChris Mason struct file *src_file; 1401f46b5a66SChristoph Hellwig int namelen; 14023de4586cSChris Mason int ret = 0; 1403f46b5a66SChristoph Hellwig 1404c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1405c146afadSYan Zheng return -EROFS; 1406c146afadSYan Zheng 140772fd032eSSage Weil namelen = strlen(name); 140872fd032eSSage Weil if (strchr(name, '/')) { 1409f46b5a66SChristoph Hellwig ret = -EINVAL; 1410f46b5a66SChristoph Hellwig goto out; 1411f46b5a66SChristoph Hellwig } 1412f46b5a66SChristoph Hellwig 141316780cabSChris Mason if (name[0] == '.' && 141416780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 141516780cabSChris Mason ret = -EEXIST; 141616780cabSChris Mason goto out; 141716780cabSChris Mason } 141816780cabSChris Mason 14193de4586cSChris Mason if (subvol) { 142072fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 1421b83cc969SLi Zefan NULL, transid, readonly); 1422cb8e7090SChristoph Hellwig } else { 14233de4586cSChris Mason struct inode *src_inode; 142472fd032eSSage Weil src_file = fget(fd); 14253de4586cSChris Mason if (!src_file) { 14263de4586cSChris Mason ret = -EINVAL; 14273de4586cSChris Mason goto out; 14283de4586cSChris Mason } 14293de4586cSChris Mason 14303de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 14313de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 1432d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 1433d397712bSChris Mason "another FS\n"); 14343de4586cSChris Mason ret = -EINVAL; 14353de4586cSChris Mason fput(src_file); 14363de4586cSChris Mason goto out; 14373de4586cSChris Mason } 143872fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 143972fd032eSSage Weil BTRFS_I(src_inode)->root, 1440b83cc969SLi Zefan transid, readonly); 14413de4586cSChris Mason fput(src_file); 1442cb8e7090SChristoph Hellwig } 1443f46b5a66SChristoph Hellwig out: 144472fd032eSSage Weil return ret; 144572fd032eSSage Weil } 144672fd032eSSage Weil 144772fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1448fa0d2b9bSLi Zefan void __user *arg, int subvol) 144972fd032eSSage Weil { 1450fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 145172fd032eSSage Weil int ret; 145272fd032eSSage Weil 1453fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1454fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1455fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1456fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1457fa0d2b9bSLi Zefan 1458fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1459b83cc969SLi Zefan vol_args->fd, subvol, 1460b83cc969SLi Zefan NULL, false); 1461fa0d2b9bSLi Zefan 1462fa0d2b9bSLi Zefan kfree(vol_args); 1463fa0d2b9bSLi Zefan return ret; 1464fa0d2b9bSLi Zefan } 1465fa0d2b9bSLi Zefan 1466fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1467fa0d2b9bSLi Zefan void __user *arg, int subvol) 1468fa0d2b9bSLi Zefan { 1469fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1470fa0d2b9bSLi Zefan int ret; 1471fdfb1e4fSLi Zefan u64 transid = 0; 1472fdfb1e4fSLi Zefan u64 *ptr = NULL; 1473b83cc969SLi Zefan bool readonly = false; 147472fd032eSSage Weil 1475fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1476fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1477fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1478fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1479fdfb1e4fSLi Zefan 1480b83cc969SLi Zefan if (vol_args->flags & 1481b83cc969SLi Zefan ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY)) { 1482b83cc969SLi Zefan ret = -EOPNOTSUPP; 1483fdfb1e4fSLi Zefan goto out; 1484fdfb1e4fSLi Zefan } 1485fdfb1e4fSLi Zefan 1486fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1487fdfb1e4fSLi Zefan ptr = &transid; 1488b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1489b83cc969SLi Zefan readonly = true; 149075eaa0e2SSage Weil 1491fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1492b83cc969SLi Zefan vol_args->fd, subvol, 1493b83cc969SLi Zefan ptr, readonly); 149475eaa0e2SSage Weil 1495fdfb1e4fSLi Zefan if (ret == 0 && ptr && 149675eaa0e2SSage Weil copy_to_user(arg + 1497fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1498fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 149975eaa0e2SSage Weil ret = -EFAULT; 1500fdfb1e4fSLi Zefan out: 1501f46b5a66SChristoph Hellwig kfree(vol_args); 1502f46b5a66SChristoph Hellwig return ret; 1503f46b5a66SChristoph Hellwig } 1504f46b5a66SChristoph Hellwig 15050caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 15060caa102dSLi Zefan void __user *arg) 15070caa102dSLi Zefan { 15080caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 15090caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 15100caa102dSLi Zefan int ret = 0; 15110caa102dSLi Zefan u64 flags = 0; 15120caa102dSLi Zefan 151333345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 15140caa102dSLi Zefan return -EINVAL; 15150caa102dSLi Zefan 15160caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 15170caa102dSLi Zefan if (btrfs_root_readonly(root)) 15180caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 15190caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 15200caa102dSLi Zefan 15210caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 15220caa102dSLi Zefan ret = -EFAULT; 15230caa102dSLi Zefan 15240caa102dSLi Zefan return ret; 15250caa102dSLi Zefan } 15260caa102dSLi Zefan 15270caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 15280caa102dSLi Zefan void __user *arg) 15290caa102dSLi Zefan { 15300caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 15310caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 15320caa102dSLi Zefan struct btrfs_trans_handle *trans; 15330caa102dSLi Zefan u64 root_flags; 15340caa102dSLi Zefan u64 flags; 15350caa102dSLi Zefan int ret = 0; 15360caa102dSLi Zefan 15370caa102dSLi Zefan if (root->fs_info->sb->s_flags & MS_RDONLY) 15380caa102dSLi Zefan return -EROFS; 15390caa102dSLi Zefan 154033345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 15410caa102dSLi Zefan return -EINVAL; 15420caa102dSLi Zefan 15430caa102dSLi Zefan if (copy_from_user(&flags, arg, sizeof(flags))) 15440caa102dSLi Zefan return -EFAULT; 15450caa102dSLi Zefan 1546b4dc2b8cSLi Zefan if (flags & BTRFS_SUBVOL_CREATE_ASYNC) 15470caa102dSLi Zefan return -EINVAL; 15480caa102dSLi Zefan 15490caa102dSLi Zefan if (flags & ~BTRFS_SUBVOL_RDONLY) 15500caa102dSLi Zefan return -EOPNOTSUPP; 15510caa102dSLi Zefan 15522e149670SSerge E. Hallyn if (!inode_owner_or_capable(inode)) 1553b4dc2b8cSLi Zefan return -EACCES; 1554b4dc2b8cSLi Zefan 15550caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 15560caa102dSLi Zefan 15570caa102dSLi Zefan /* nothing to do */ 15580caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 15590caa102dSLi Zefan goto out; 15600caa102dSLi Zefan 15610caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 15620caa102dSLi Zefan if (flags & BTRFS_SUBVOL_RDONLY) 15630caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 15640caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 15650caa102dSLi Zefan else 15660caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 15670caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 15680caa102dSLi Zefan 15690caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 15700caa102dSLi Zefan if (IS_ERR(trans)) { 15710caa102dSLi Zefan ret = PTR_ERR(trans); 15720caa102dSLi Zefan goto out_reset; 15730caa102dSLi Zefan } 15740caa102dSLi Zefan 1575b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 15760caa102dSLi Zefan &root->root_key, &root->root_item); 15770caa102dSLi Zefan 15780caa102dSLi Zefan btrfs_commit_transaction(trans, root); 15790caa102dSLi Zefan out_reset: 15800caa102dSLi Zefan if (ret) 15810caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 15820caa102dSLi Zefan out: 15830caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 15840caa102dSLi Zefan return ret; 15850caa102dSLi Zefan } 15860caa102dSLi Zefan 158776dda93cSYan, Zheng /* 158876dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 158976dda93cSYan, Zheng */ 159076dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 159176dda93cSYan, Zheng { 159276dda93cSYan, Zheng struct btrfs_path *path; 159376dda93cSYan, Zheng struct btrfs_key key; 159476dda93cSYan, Zheng int ret; 159576dda93cSYan, Zheng 159676dda93cSYan, Zheng path = btrfs_alloc_path(); 159776dda93cSYan, Zheng if (!path) 159876dda93cSYan, Zheng return -ENOMEM; 159976dda93cSYan, Zheng 160076dda93cSYan, Zheng key.objectid = root->root_key.objectid; 160176dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 160276dda93cSYan, Zheng key.offset = (u64)-1; 160376dda93cSYan, Zheng 160476dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 160576dda93cSYan, Zheng &key, path, 0, 0); 160676dda93cSYan, Zheng if (ret < 0) 160776dda93cSYan, Zheng goto out; 160876dda93cSYan, Zheng BUG_ON(ret == 0); 160976dda93cSYan, Zheng 161076dda93cSYan, Zheng ret = 0; 161176dda93cSYan, Zheng if (path->slots[0] > 0) { 161276dda93cSYan, Zheng path->slots[0]--; 161376dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 161476dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 161576dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 161676dda93cSYan, Zheng ret = -ENOTEMPTY; 161776dda93cSYan, Zheng } 161876dda93cSYan, Zheng out: 161976dda93cSYan, Zheng btrfs_free_path(path); 162076dda93cSYan, Zheng return ret; 162176dda93cSYan, Zheng } 162276dda93cSYan, Zheng 1623ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1624ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1625ac8e9819SChris Mason { 1626abc6e134SChris Mason struct btrfs_key test; 1627abc6e134SChris Mason int ret; 1628abc6e134SChris Mason 1629abc6e134SChris Mason test.objectid = sk->min_objectid; 1630abc6e134SChris Mason test.type = sk->min_type; 1631abc6e134SChris Mason test.offset = sk->min_offset; 1632abc6e134SChris Mason 1633abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1634abc6e134SChris Mason if (ret < 0) 1635ac8e9819SChris Mason return 0; 1636abc6e134SChris Mason 1637abc6e134SChris Mason test.objectid = sk->max_objectid; 1638abc6e134SChris Mason test.type = sk->max_type; 1639abc6e134SChris Mason test.offset = sk->max_offset; 1640abc6e134SChris Mason 1641abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1642abc6e134SChris Mason if (ret > 0) 1643ac8e9819SChris Mason return 0; 1644ac8e9819SChris Mason return 1; 1645ac8e9819SChris Mason } 1646ac8e9819SChris Mason 1647ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1648ac8e9819SChris Mason struct btrfs_path *path, 1649ac8e9819SChris Mason struct btrfs_key *key, 1650ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1651ac8e9819SChris Mason char *buf, 1652ac8e9819SChris Mason unsigned long *sk_offset, 1653ac8e9819SChris Mason int *num_found) 1654ac8e9819SChris Mason { 1655ac8e9819SChris Mason u64 found_transid; 1656ac8e9819SChris Mason struct extent_buffer *leaf; 1657ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1658ac8e9819SChris Mason unsigned long item_off; 1659ac8e9819SChris Mason unsigned long item_len; 1660ac8e9819SChris Mason int nritems; 1661ac8e9819SChris Mason int i; 1662ac8e9819SChris Mason int slot; 1663ac8e9819SChris Mason int ret = 0; 1664ac8e9819SChris Mason 1665ac8e9819SChris Mason leaf = path->nodes[0]; 1666ac8e9819SChris Mason slot = path->slots[0]; 1667ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1668ac8e9819SChris Mason 1669ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1670ac8e9819SChris Mason i = nritems; 1671ac8e9819SChris Mason goto advance_key; 1672ac8e9819SChris Mason } 1673ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1674ac8e9819SChris Mason 1675ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1676ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1677ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1678ac8e9819SChris Mason 1679ac8e9819SChris Mason if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1680ac8e9819SChris Mason item_len = 0; 1681ac8e9819SChris Mason 1682ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1683ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1684ac8e9819SChris Mason ret = 1; 1685ac8e9819SChris Mason goto overflow; 1686ac8e9819SChris Mason } 1687ac8e9819SChris Mason 1688ac8e9819SChris Mason btrfs_item_key_to_cpu(leaf, key, i); 1689ac8e9819SChris Mason if (!key_in_sk(key, sk)) 1690ac8e9819SChris Mason continue; 1691ac8e9819SChris Mason 1692ac8e9819SChris Mason sh.objectid = key->objectid; 1693ac8e9819SChris Mason sh.offset = key->offset; 1694ac8e9819SChris Mason sh.type = key->type; 1695ac8e9819SChris Mason sh.len = item_len; 1696ac8e9819SChris Mason sh.transid = found_transid; 1697ac8e9819SChris Mason 1698ac8e9819SChris Mason /* copy search result header */ 1699ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1700ac8e9819SChris Mason *sk_offset += sizeof(sh); 1701ac8e9819SChris Mason 1702ac8e9819SChris Mason if (item_len) { 1703ac8e9819SChris Mason char *p = buf + *sk_offset; 1704ac8e9819SChris Mason /* copy the item */ 1705ac8e9819SChris Mason read_extent_buffer(leaf, p, 1706ac8e9819SChris Mason item_off, item_len); 1707ac8e9819SChris Mason *sk_offset += item_len; 1708ac8e9819SChris Mason } 1709e2156867SHugo Mills (*num_found)++; 1710ac8e9819SChris Mason 1711ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1712ac8e9819SChris Mason break; 1713ac8e9819SChris Mason } 1714ac8e9819SChris Mason advance_key: 1715ac8e9819SChris Mason ret = 0; 1716abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1717abc6e134SChris Mason key->offset++; 1718abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1719abc6e134SChris Mason key->offset = 0; 1720abc6e134SChris Mason key->type++; 1721abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1722abc6e134SChris Mason key->offset = 0; 1723abc6e134SChris Mason key->type = 0; 1724abc6e134SChris Mason key->objectid++; 1725abc6e134SChris Mason } else 1726abc6e134SChris Mason ret = 1; 1727ac8e9819SChris Mason overflow: 1728ac8e9819SChris Mason return ret; 1729ac8e9819SChris Mason } 1730ac8e9819SChris Mason 1731ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1732ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1733ac8e9819SChris Mason { 1734ac8e9819SChris Mason struct btrfs_root *root; 1735ac8e9819SChris Mason struct btrfs_key key; 1736ac8e9819SChris Mason struct btrfs_key max_key; 1737ac8e9819SChris Mason struct btrfs_path *path; 1738ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1739ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1740ac8e9819SChris Mason int ret; 1741ac8e9819SChris Mason int num_found = 0; 1742ac8e9819SChris Mason unsigned long sk_offset = 0; 1743ac8e9819SChris Mason 1744ac8e9819SChris Mason path = btrfs_alloc_path(); 1745ac8e9819SChris Mason if (!path) 1746ac8e9819SChris Mason return -ENOMEM; 1747ac8e9819SChris Mason 1748ac8e9819SChris Mason if (sk->tree_id == 0) { 1749ac8e9819SChris Mason /* search the root of the inode that was passed */ 1750ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1751ac8e9819SChris Mason } else { 1752ac8e9819SChris Mason key.objectid = sk->tree_id; 1753ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1754ac8e9819SChris Mason key.offset = (u64)-1; 1755ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1756ac8e9819SChris Mason if (IS_ERR(root)) { 1757ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1758ac8e9819SChris Mason sk->tree_id); 1759ac8e9819SChris Mason btrfs_free_path(path); 1760ac8e9819SChris Mason return -ENOENT; 1761ac8e9819SChris Mason } 1762ac8e9819SChris Mason } 1763ac8e9819SChris Mason 1764ac8e9819SChris Mason key.objectid = sk->min_objectid; 1765ac8e9819SChris Mason key.type = sk->min_type; 1766ac8e9819SChris Mason key.offset = sk->min_offset; 1767ac8e9819SChris Mason 1768ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1769ac8e9819SChris Mason max_key.type = sk->max_type; 1770ac8e9819SChris Mason max_key.offset = sk->max_offset; 1771ac8e9819SChris Mason 1772ac8e9819SChris Mason path->keep_locks = 1; 1773ac8e9819SChris Mason 1774ac8e9819SChris Mason while(1) { 1775ac8e9819SChris Mason ret = btrfs_search_forward(root, &key, &max_key, path, 0, 1776ac8e9819SChris Mason sk->min_transid); 1777ac8e9819SChris Mason if (ret != 0) { 1778ac8e9819SChris Mason if (ret > 0) 1779ac8e9819SChris Mason ret = 0; 1780ac8e9819SChris Mason goto err; 1781ac8e9819SChris Mason } 1782ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1783ac8e9819SChris Mason &sk_offset, &num_found); 1784b3b4aa74SDavid Sterba btrfs_release_path(path); 1785ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1786ac8e9819SChris Mason break; 1787ac8e9819SChris Mason 1788ac8e9819SChris Mason } 1789ac8e9819SChris Mason ret = 0; 1790ac8e9819SChris Mason err: 1791ac8e9819SChris Mason sk->nr_items = num_found; 1792ac8e9819SChris Mason btrfs_free_path(path); 1793ac8e9819SChris Mason return ret; 1794ac8e9819SChris Mason } 1795ac8e9819SChris Mason 1796ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1797ac8e9819SChris Mason void __user *argp) 1798ac8e9819SChris Mason { 1799ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1800ac8e9819SChris Mason struct inode *inode; 1801ac8e9819SChris Mason int ret; 1802ac8e9819SChris Mason 1803ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1804ac8e9819SChris Mason return -EPERM; 1805ac8e9819SChris Mason 18062354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 18072354d08fSJulia Lawall if (IS_ERR(args)) 18082354d08fSJulia Lawall return PTR_ERR(args); 1809ac8e9819SChris Mason 1810ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1811ac8e9819SChris Mason ret = search_ioctl(inode, args); 1812ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1813ac8e9819SChris Mason ret = -EFAULT; 1814ac8e9819SChris Mason kfree(args); 1815ac8e9819SChris Mason return ret; 1816ac8e9819SChris Mason } 1817ac8e9819SChris Mason 181898d377a0STARUISI Hiroaki /* 1819ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1820ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 182198d377a0STARUISI Hiroaki */ 182298d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 182398d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 182498d377a0STARUISI Hiroaki { 182598d377a0STARUISI Hiroaki struct btrfs_root *root; 182698d377a0STARUISI Hiroaki struct btrfs_key key; 1827ac8e9819SChris Mason char *ptr; 182898d377a0STARUISI Hiroaki int ret = -1; 182998d377a0STARUISI Hiroaki int slot; 183098d377a0STARUISI Hiroaki int len; 183198d377a0STARUISI Hiroaki int total_len = 0; 183298d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 183398d377a0STARUISI Hiroaki struct extent_buffer *l; 183498d377a0STARUISI Hiroaki struct btrfs_path *path; 183598d377a0STARUISI Hiroaki 183698d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 183798d377a0STARUISI Hiroaki name[0]='\0'; 183898d377a0STARUISI Hiroaki return 0; 183998d377a0STARUISI Hiroaki } 184098d377a0STARUISI Hiroaki 184198d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 184298d377a0STARUISI Hiroaki if (!path) 184398d377a0STARUISI Hiroaki return -ENOMEM; 184498d377a0STARUISI Hiroaki 1845ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 184698d377a0STARUISI Hiroaki 184798d377a0STARUISI Hiroaki key.objectid = tree_id; 184898d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 184998d377a0STARUISI Hiroaki key.offset = (u64)-1; 185098d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 185198d377a0STARUISI Hiroaki if (IS_ERR(root)) { 185298d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 18538ad6fcabSChris Mason ret = -ENOENT; 18548ad6fcabSChris Mason goto out; 185598d377a0STARUISI Hiroaki } 185698d377a0STARUISI Hiroaki 185798d377a0STARUISI Hiroaki key.objectid = dirid; 185898d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 18598ad6fcabSChris Mason key.offset = (u64)-1; 186098d377a0STARUISI Hiroaki 186198d377a0STARUISI Hiroaki while(1) { 186298d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 186398d377a0STARUISI Hiroaki if (ret < 0) 186498d377a0STARUISI Hiroaki goto out; 186598d377a0STARUISI Hiroaki 186698d377a0STARUISI Hiroaki l = path->nodes[0]; 186798d377a0STARUISI Hiroaki slot = path->slots[0]; 18688ad6fcabSChris Mason if (ret > 0 && slot > 0) 18698ad6fcabSChris Mason slot--; 187098d377a0STARUISI Hiroaki btrfs_item_key_to_cpu(l, &key, slot); 187198d377a0STARUISI Hiroaki 187298d377a0STARUISI Hiroaki if (ret > 0 && (key.objectid != dirid || 1873ac8e9819SChris Mason key.type != BTRFS_INODE_REF_KEY)) { 1874ac8e9819SChris Mason ret = -ENOENT; 187598d377a0STARUISI Hiroaki goto out; 1876ac8e9819SChris Mason } 187798d377a0STARUISI Hiroaki 187898d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 187998d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 188098d377a0STARUISI Hiroaki ptr -= len + 1; 188198d377a0STARUISI Hiroaki total_len += len + 1; 1882ac8e9819SChris Mason if (ptr < name) 188398d377a0STARUISI Hiroaki goto out; 188498d377a0STARUISI Hiroaki 188598d377a0STARUISI Hiroaki *(ptr + len) = '/'; 188698d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 188798d377a0STARUISI Hiroaki 188898d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 188998d377a0STARUISI Hiroaki break; 189098d377a0STARUISI Hiroaki 1891b3b4aa74SDavid Sterba btrfs_release_path(path); 189298d377a0STARUISI Hiroaki key.objectid = key.offset; 18938ad6fcabSChris Mason key.offset = (u64)-1; 189498d377a0STARUISI Hiroaki dirid = key.objectid; 189598d377a0STARUISI Hiroaki } 1896ac8e9819SChris Mason if (ptr < name) 189798d377a0STARUISI Hiroaki goto out; 189877906a50SLi Zefan memmove(name, ptr, total_len); 189998d377a0STARUISI Hiroaki name[total_len]='\0'; 190098d377a0STARUISI Hiroaki ret = 0; 190198d377a0STARUISI Hiroaki out: 190298d377a0STARUISI Hiroaki btrfs_free_path(path); 1903ac8e9819SChris Mason return ret; 1904ac8e9819SChris Mason } 1905ac8e9819SChris Mason 1906ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 1907ac8e9819SChris Mason void __user *argp) 1908ac8e9819SChris Mason { 1909ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 1910ac8e9819SChris Mason struct inode *inode; 1911ac8e9819SChris Mason int ret; 1912ac8e9819SChris Mason 1913ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1914ac8e9819SChris Mason return -EPERM; 1915ac8e9819SChris Mason 19162354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 19172354d08fSJulia Lawall if (IS_ERR(args)) 19182354d08fSJulia Lawall return PTR_ERR(args); 1919c2b96929SDan Carpenter 1920ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1921ac8e9819SChris Mason 19221b53ac4dSChris Mason if (args->treeid == 0) 19231b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 19241b53ac4dSChris Mason 1925ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 1926ac8e9819SChris Mason args->treeid, args->objectid, 1927ac8e9819SChris Mason args->name); 1928ac8e9819SChris Mason 1929ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1930ac8e9819SChris Mason ret = -EFAULT; 1931ac8e9819SChris Mason 1932ac8e9819SChris Mason kfree(args); 193398d377a0STARUISI Hiroaki return ret; 193498d377a0STARUISI Hiroaki } 193598d377a0STARUISI Hiroaki 193676dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 193776dda93cSYan, Zheng void __user *arg) 193876dda93cSYan, Zheng { 193976dda93cSYan, Zheng struct dentry *parent = fdentry(file); 194076dda93cSYan, Zheng struct dentry *dentry; 194176dda93cSYan, Zheng struct inode *dir = parent->d_inode; 194276dda93cSYan, Zheng struct inode *inode; 194376dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 194476dda93cSYan, Zheng struct btrfs_root *dest = NULL; 194576dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 194676dda93cSYan, Zheng struct btrfs_trans_handle *trans; 194776dda93cSYan, Zheng int namelen; 194876dda93cSYan, Zheng int ret; 194976dda93cSYan, Zheng int err = 0; 195076dda93cSYan, Zheng 195176dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 195276dda93cSYan, Zheng if (IS_ERR(vol_args)) 195376dda93cSYan, Zheng return PTR_ERR(vol_args); 195476dda93cSYan, Zheng 195576dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 195676dda93cSYan, Zheng namelen = strlen(vol_args->name); 195776dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 195876dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 195976dda93cSYan, Zheng err = -EINVAL; 196076dda93cSYan, Zheng goto out; 196176dda93cSYan, Zheng } 196276dda93cSYan, Zheng 1963a561be71SAl Viro err = mnt_want_write_file(file); 196476dda93cSYan, Zheng if (err) 196576dda93cSYan, Zheng goto out; 196676dda93cSYan, Zheng 196776dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 196876dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 196976dda93cSYan, Zheng if (IS_ERR(dentry)) { 197076dda93cSYan, Zheng err = PTR_ERR(dentry); 197176dda93cSYan, Zheng goto out_unlock_dir; 197276dda93cSYan, Zheng } 197376dda93cSYan, Zheng 197476dda93cSYan, Zheng if (!dentry->d_inode) { 197576dda93cSYan, Zheng err = -ENOENT; 197676dda93cSYan, Zheng goto out_dput; 197776dda93cSYan, Zheng } 197876dda93cSYan, Zheng 197976dda93cSYan, Zheng inode = dentry->d_inode; 19804260f7c7SSage Weil dest = BTRFS_I(inode)->root; 19814260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)){ 19824260f7c7SSage Weil /* 19834260f7c7SSage Weil * Regular user. Only allow this with a special mount 19844260f7c7SSage Weil * option, when the user has write+exec access to the 19854260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 19864260f7c7SSage Weil * allowed. 19874260f7c7SSage Weil * 19884260f7c7SSage Weil * Note that this is _not_ check that the subvol is 19894260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 19904260f7c7SSage Weil * otherwise be able to delete. 19914260f7c7SSage Weil * 19924260f7c7SSage Weil * Users who want to delete empty subvols should try 19934260f7c7SSage Weil * rmdir(2). 19944260f7c7SSage Weil */ 19954260f7c7SSage Weil err = -EPERM; 19964260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 19974260f7c7SSage Weil goto out_dput; 19984260f7c7SSage Weil 19994260f7c7SSage Weil /* 20004260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 20014260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 20024260f7c7SSage Weil * must be called on the dentry referencing the root 20034260f7c7SSage Weil * of the subvol, not a random directory contained 20044260f7c7SSage Weil * within it. 20054260f7c7SSage Weil */ 20064260f7c7SSage Weil err = -EINVAL; 20074260f7c7SSage Weil if (root == dest) 20084260f7c7SSage Weil goto out_dput; 20094260f7c7SSage Weil 20104260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 20114260f7c7SSage Weil if (err) 20124260f7c7SSage Weil goto out_dput; 20134260f7c7SSage Weil 20144260f7c7SSage Weil /* check if subvolume may be deleted by a non-root user */ 20154260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 20164260f7c7SSage Weil if (err) 20174260f7c7SSage Weil goto out_dput; 20184260f7c7SSage Weil } 20194260f7c7SSage Weil 202033345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 202176dda93cSYan, Zheng err = -EINVAL; 202276dda93cSYan, Zheng goto out_dput; 202376dda93cSYan, Zheng } 202476dda93cSYan, Zheng 202576dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 202676dda93cSYan, Zheng err = d_invalidate(dentry); 202776dda93cSYan, Zheng if (err) 202876dda93cSYan, Zheng goto out_unlock; 202976dda93cSYan, Zheng 203076dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 203176dda93cSYan, Zheng 203276dda93cSYan, Zheng err = may_destroy_subvol(dest); 203376dda93cSYan, Zheng if (err) 203476dda93cSYan, Zheng goto out_up_write; 203576dda93cSYan, Zheng 2036a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2037a22285a6SYan, Zheng if (IS_ERR(trans)) { 2038a22285a6SYan, Zheng err = PTR_ERR(trans); 2039d327099aSDan Carpenter goto out_up_write; 2040a22285a6SYan, Zheng } 2041a22285a6SYan, Zheng trans->block_rsv = &root->fs_info->global_block_rsv; 2042a22285a6SYan, Zheng 204376dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 204476dda93cSYan, Zheng dest->root_key.objectid, 204576dda93cSYan, Zheng dentry->d_name.name, 204676dda93cSYan, Zheng dentry->d_name.len); 204779787eaaSJeff Mahoney if (ret) { 204879787eaaSJeff Mahoney err = ret; 204979787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 205079787eaaSJeff Mahoney goto out_end_trans; 205179787eaaSJeff Mahoney } 205276dda93cSYan, Zheng 205376dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 205476dda93cSYan, Zheng 205576dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 205676dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 205776dda93cSYan, Zheng dest->root_item.drop_level = 0; 205876dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 205976dda93cSYan, Zheng 2060d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 206176dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 206276dda93cSYan, Zheng root->fs_info->tree_root, 206376dda93cSYan, Zheng dest->root_key.objectid); 206479787eaaSJeff Mahoney if (ret) { 206579787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 206679787eaaSJeff Mahoney err = ret; 206779787eaaSJeff Mahoney goto out_end_trans; 2068d68fc57bSYan, Zheng } 206979787eaaSJeff Mahoney } 207079787eaaSJeff Mahoney out_end_trans: 2071531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 207279787eaaSJeff Mahoney if (ret && !err) 207379787eaaSJeff Mahoney err = ret; 207476dda93cSYan, Zheng inode->i_flags |= S_DEAD; 207576dda93cSYan, Zheng out_up_write: 207676dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 207776dda93cSYan, Zheng out_unlock: 207876dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 207976dda93cSYan, Zheng if (!err) { 2080efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 208176dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 208276dda93cSYan, Zheng d_delete(dentry); 208376dda93cSYan, Zheng } 208476dda93cSYan, Zheng out_dput: 208576dda93cSYan, Zheng dput(dentry); 208676dda93cSYan, Zheng out_unlock_dir: 208776dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 20882a79f17eSAl Viro mnt_drop_write_file(file); 208976dda93cSYan, Zheng out: 209076dda93cSYan, Zheng kfree(vol_args); 209176dda93cSYan, Zheng return err; 209276dda93cSYan, Zheng } 209376dda93cSYan, Zheng 20941e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2095f46b5a66SChristoph Hellwig { 2096f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2097f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 20981e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2099c146afadSYan Zheng int ret; 2100c146afadSYan Zheng 2101b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2102b83cc969SLi Zefan return -EROFS; 2103b83cc969SLi Zefan 2104a561be71SAl Viro ret = mnt_want_write_file(file); 2105c146afadSYan Zheng if (ret) 2106c146afadSYan Zheng return ret; 2107f46b5a66SChristoph Hellwig 2108f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2109f46b5a66SChristoph Hellwig case S_IFDIR: 2110e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2111e441d54dSChris Mason ret = -EPERM; 2112e441d54dSChris Mason goto out; 2113e441d54dSChris Mason } 21148929ecfaSYan, Zheng ret = btrfs_defrag_root(root, 0); 21158929ecfaSYan, Zheng if (ret) 21168929ecfaSYan, Zheng goto out; 21178929ecfaSYan, Zheng ret = btrfs_defrag_root(root->fs_info->extent_root, 0); 2118f46b5a66SChristoph Hellwig break; 2119f46b5a66SChristoph Hellwig case S_IFREG: 2120e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2121e441d54dSChris Mason ret = -EINVAL; 2122e441d54dSChris Mason goto out; 2123e441d54dSChris Mason } 21241e701a32SChris Mason 21251e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 21261e701a32SChris Mason if (!range) { 21271e701a32SChris Mason ret = -ENOMEM; 21281e701a32SChris Mason goto out; 21291e701a32SChris Mason } 21301e701a32SChris Mason 21311e701a32SChris Mason if (argp) { 21321e701a32SChris Mason if (copy_from_user(range, argp, 21331e701a32SChris Mason sizeof(*range))) { 21341e701a32SChris Mason ret = -EFAULT; 21351e701a32SChris Mason kfree(range); 2136683be16eSDan Carpenter goto out; 21371e701a32SChris Mason } 21381e701a32SChris Mason /* compression requires us to start the IO */ 21391e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 21401e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 21411e701a32SChris Mason range->extent_thresh = (u32)-1; 21421e701a32SChris Mason } 21431e701a32SChris Mason } else { 21441e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 21451e701a32SChris Mason range->len = (u64)-1; 21461e701a32SChris Mason } 21474cb5300bSChris Mason ret = btrfs_defrag_file(fdentry(file)->d_inode, file, 21484cb5300bSChris Mason range, 0, 0); 21494cb5300bSChris Mason if (ret > 0) 21504cb5300bSChris Mason ret = 0; 21511e701a32SChris Mason kfree(range); 2152f46b5a66SChristoph Hellwig break; 21538929ecfaSYan, Zheng default: 21548929ecfaSYan, Zheng ret = -EINVAL; 2155f46b5a66SChristoph Hellwig } 2156e441d54dSChris Mason out: 21572a79f17eSAl Viro mnt_drop_write_file(file); 2158e441d54dSChris Mason return ret; 2159f46b5a66SChristoph Hellwig } 2160f46b5a66SChristoph Hellwig 2161b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2162f46b5a66SChristoph Hellwig { 2163f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2164f46b5a66SChristoph Hellwig int ret; 2165f46b5a66SChristoph Hellwig 2166e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2167e441d54dSChris Mason return -EPERM; 2168e441d54dSChris Mason 2169c9e9f97bSIlya Dryomov mutex_lock(&root->fs_info->volume_mutex); 2170c9e9f97bSIlya Dryomov if (root->fs_info->balance_ctl) { 2171c9e9f97bSIlya Dryomov printk(KERN_INFO "btrfs: balance in progress\n"); 2172c9e9f97bSIlya Dryomov ret = -EINVAL; 2173c9e9f97bSIlya Dryomov goto out; 2174c9e9f97bSIlya Dryomov } 2175c9e9f97bSIlya Dryomov 2176dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2177c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2178c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2179c9e9f97bSIlya Dryomov goto out; 2180c9e9f97bSIlya Dryomov } 2181f46b5a66SChristoph Hellwig 21825516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2183f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2184f46b5a66SChristoph Hellwig 2185f46b5a66SChristoph Hellwig kfree(vol_args); 2186c9e9f97bSIlya Dryomov out: 2187c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 2188f46b5a66SChristoph Hellwig return ret; 2189f46b5a66SChristoph Hellwig } 2190f46b5a66SChristoph Hellwig 2191b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 2192f46b5a66SChristoph Hellwig { 2193f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2194f46b5a66SChristoph Hellwig int ret; 2195f46b5a66SChristoph Hellwig 2196e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2197e441d54dSChris Mason return -EPERM; 2198e441d54dSChris Mason 2199c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 2200c146afadSYan Zheng return -EROFS; 2201c146afadSYan Zheng 2202c9e9f97bSIlya Dryomov mutex_lock(&root->fs_info->volume_mutex); 2203c9e9f97bSIlya Dryomov if (root->fs_info->balance_ctl) { 2204c9e9f97bSIlya Dryomov printk(KERN_INFO "btrfs: balance in progress\n"); 2205c9e9f97bSIlya Dryomov ret = -EINVAL; 2206c9e9f97bSIlya Dryomov goto out; 2207c9e9f97bSIlya Dryomov } 2208c9e9f97bSIlya Dryomov 2209dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2210c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2211c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2212c9e9f97bSIlya Dryomov goto out; 2213c9e9f97bSIlya Dryomov } 2214f46b5a66SChristoph Hellwig 22155516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2216f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 2217f46b5a66SChristoph Hellwig 2218f46b5a66SChristoph Hellwig kfree(vol_args); 2219c9e9f97bSIlya Dryomov out: 2220c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 2221f46b5a66SChristoph Hellwig return ret; 2222f46b5a66SChristoph Hellwig } 2223f46b5a66SChristoph Hellwig 2224475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2225475f6387SJan Schmidt { 2226027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2227475f6387SJan Schmidt struct btrfs_device *device; 2228475f6387SJan Schmidt struct btrfs_device *next; 2229475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2230027ed2f0SLi Zefan int ret = 0; 2231475f6387SJan Schmidt 2232475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2233475f6387SJan Schmidt return -EPERM; 2234475f6387SJan Schmidt 2235027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2236027ed2f0SLi Zefan if (!fi_args) 2237027ed2f0SLi Zefan return -ENOMEM; 2238027ed2f0SLi Zefan 2239027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2240027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2241475f6387SJan Schmidt 2242475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2243475f6387SJan Schmidt list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { 2244027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2245027ed2f0SLi Zefan fi_args->max_id = device->devid; 2246475f6387SJan Schmidt } 2247475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2248475f6387SJan Schmidt 2249027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2250027ed2f0SLi Zefan ret = -EFAULT; 2251475f6387SJan Schmidt 2252027ed2f0SLi Zefan kfree(fi_args); 2253027ed2f0SLi Zefan return ret; 2254475f6387SJan Schmidt } 2255475f6387SJan Schmidt 2256475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2257475f6387SJan Schmidt { 2258475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2259475f6387SJan Schmidt struct btrfs_device *dev; 2260475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2261475f6387SJan Schmidt int ret = 0; 2262475f6387SJan Schmidt char *s_uuid = NULL; 2263475f6387SJan Schmidt char empty_uuid[BTRFS_UUID_SIZE] = {0}; 2264475f6387SJan Schmidt 2265475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2266475f6387SJan Schmidt return -EPERM; 2267475f6387SJan Schmidt 2268475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2269475f6387SJan Schmidt if (IS_ERR(di_args)) 2270475f6387SJan Schmidt return PTR_ERR(di_args); 2271475f6387SJan Schmidt 2272475f6387SJan Schmidt if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0) 2273475f6387SJan Schmidt s_uuid = di_args->uuid; 2274475f6387SJan Schmidt 2275475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2276475f6387SJan Schmidt dev = btrfs_find_device(root, di_args->devid, s_uuid, NULL); 2277475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2278475f6387SJan Schmidt 2279475f6387SJan Schmidt if (!dev) { 2280475f6387SJan Schmidt ret = -ENODEV; 2281475f6387SJan Schmidt goto out; 2282475f6387SJan Schmidt } 2283475f6387SJan Schmidt 2284475f6387SJan Schmidt di_args->devid = dev->devid; 2285475f6387SJan Schmidt di_args->bytes_used = dev->bytes_used; 2286475f6387SJan Schmidt di_args->total_bytes = dev->total_bytes; 2287475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2288a27202fbSJim Meyering if (dev->name) { 2289606686eeSJosef Bacik struct rcu_string *name; 2290606686eeSJosef Bacik 2291606686eeSJosef Bacik rcu_read_lock(); 2292606686eeSJosef Bacik name = rcu_dereference(dev->name); 2293606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2294606686eeSJosef Bacik rcu_read_unlock(); 2295a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2296a27202fbSJim Meyering } else { 229799ba55adSStefan Behrens di_args->path[0] = '\0'; 2298a27202fbSJim Meyering } 2299475f6387SJan Schmidt 2300475f6387SJan Schmidt out: 2301475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2302475f6387SJan Schmidt ret = -EFAULT; 2303475f6387SJan Schmidt 2304475f6387SJan Schmidt kfree(di_args); 2305475f6387SJan Schmidt return ret; 2306475f6387SJan Schmidt } 2307475f6387SJan Schmidt 230876dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 2309b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 2310f46b5a66SChristoph Hellwig { 2311f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2312f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2313f46b5a66SChristoph Hellwig struct file *src_file; 2314f46b5a66SChristoph Hellwig struct inode *src; 2315f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2316f46b5a66SChristoph Hellwig struct btrfs_path *path; 2317f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 2318ae01a0abSYan Zheng char *buf; 2319ae01a0abSYan Zheng struct btrfs_key key; 2320f46b5a66SChristoph Hellwig u32 nritems; 2321f46b5a66SChristoph Hellwig int slot; 2322ae01a0abSYan Zheng int ret; 2323c5c9cd4dSSage Weil u64 len = olen; 2324c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 2325c5c9cd4dSSage Weil u64 hint_byte; 2326d20f7043SChris Mason 2327c5c9cd4dSSage Weil /* 2328c5c9cd4dSSage Weil * TODO: 2329c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 2330c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 2331c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 2332c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 2333c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 2334c5c9cd4dSSage Weil * they don't overlap)? 2335c5c9cd4dSSage Weil */ 2336c5c9cd4dSSage Weil 2337e441d54dSChris Mason /* the destination must be opened for writing */ 23382ebc3464SDan Rosenberg if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 2339e441d54dSChris Mason return -EINVAL; 2340e441d54dSChris Mason 2341b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2342b83cc969SLi Zefan return -EROFS; 2343b83cc969SLi Zefan 2344a561be71SAl Viro ret = mnt_want_write_file(file); 2345c146afadSYan Zheng if (ret) 2346c146afadSYan Zheng return ret; 2347c146afadSYan Zheng 2348c5c9cd4dSSage Weil src_file = fget(srcfd); 2349ab67b7c1SYan Zheng if (!src_file) { 2350ab67b7c1SYan Zheng ret = -EBADF; 2351ab67b7c1SYan Zheng goto out_drop_write; 2352ab67b7c1SYan Zheng } 23535dc64164SDan Rosenberg 2354362a20c5SDavid Sterba ret = -EXDEV; 2355362a20c5SDavid Sterba if (src_file->f_path.mnt != file->f_path.mnt) 2356362a20c5SDavid Sterba goto out_fput; 2357362a20c5SDavid Sterba 2358f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 2359f46b5a66SChristoph Hellwig 2360c5c9cd4dSSage Weil ret = -EINVAL; 2361c5c9cd4dSSage Weil if (src == inode) 2362c5c9cd4dSSage Weil goto out_fput; 2363c5c9cd4dSSage Weil 23645dc64164SDan Rosenberg /* the src must be open for reading */ 23655dc64164SDan Rosenberg if (!(src_file->f_mode & FMODE_READ)) 23665dc64164SDan Rosenberg goto out_fput; 23675dc64164SDan Rosenberg 23680e7b824cSLi Zefan /* don't make the dst file partly checksummed */ 23690e7b824cSLi Zefan if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 23700e7b824cSLi Zefan (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 23710e7b824cSLi Zefan goto out_fput; 23720e7b824cSLi Zefan 2373ae01a0abSYan Zheng ret = -EISDIR; 2374ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 2375f46b5a66SChristoph Hellwig goto out_fput; 2376f46b5a66SChristoph Hellwig 2377ae01a0abSYan Zheng ret = -EXDEV; 2378362a20c5SDavid Sterba if (src->i_sb != inode->i_sb) 2379ae01a0abSYan Zheng goto out_fput; 2380ae01a0abSYan Zheng 2381ae01a0abSYan Zheng ret = -ENOMEM; 2382ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 2383ae01a0abSYan Zheng if (!buf) 2384ae01a0abSYan Zheng goto out_fput; 2385ae01a0abSYan Zheng 2386ae01a0abSYan Zheng path = btrfs_alloc_path(); 2387ae01a0abSYan Zheng if (!path) { 2388ae01a0abSYan Zheng vfree(buf); 2389ae01a0abSYan Zheng goto out_fput; 2390ae01a0abSYan Zheng } 2391ae01a0abSYan Zheng path->reada = 2; 2392ae01a0abSYan Zheng 2393f46b5a66SChristoph Hellwig if (inode < src) { 2394fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 2395fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 2396f46b5a66SChristoph Hellwig } else { 2397fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 2398fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 2399f46b5a66SChristoph Hellwig } 2400f46b5a66SChristoph Hellwig 2401c5c9cd4dSSage Weil /* determine range to clone */ 2402c5c9cd4dSSage Weil ret = -EINVAL; 24032ebc3464SDan Rosenberg if (off + len > src->i_size || off + len < off) 2404f46b5a66SChristoph Hellwig goto out_unlock; 2405c5c9cd4dSSage Weil if (len == 0) 2406c5c9cd4dSSage Weil olen = len = src->i_size - off; 2407c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 2408c5c9cd4dSSage Weil if (off + len == src->i_size) 24092a6b8daeSLi Zefan len = ALIGN(src->i_size, bs) - off; 2410c5c9cd4dSSage Weil 2411c5c9cd4dSSage Weil /* verify the end result is block aligned */ 24122a6b8daeSLi Zefan if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 24132a6b8daeSLi Zefan !IS_ALIGNED(destoff, bs)) 2414c5c9cd4dSSage Weil goto out_unlock; 2415c5c9cd4dSSage Weil 2416d525e8abSLi Zefan if (destoff > inode->i_size) { 2417d525e8abSLi Zefan ret = btrfs_cont_expand(inode, inode->i_size, destoff); 2418d525e8abSLi Zefan if (ret) 2419d525e8abSLi Zefan goto out_unlock; 2420d525e8abSLi Zefan } 2421d525e8abSLi Zefan 242271ef0786SLi Zefan /* truncate page cache pages from target inode range */ 242371ef0786SLi Zefan truncate_inode_pages_range(&inode->i_data, destoff, 242471ef0786SLi Zefan PAGE_CACHE_ALIGN(destoff + len) - 1); 242571ef0786SLi Zefan 2426f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 2427f46b5a66SChristoph Hellwig another, and lock file content */ 2428f46b5a66SChristoph Hellwig while (1) { 242931840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 2430d0082371SJeff Mahoney lock_extent(&BTRFS_I(src)->io_tree, off, off+len); 24319a019196SSage Weil ordered = btrfs_lookup_first_ordered_extent(src, off+len); 24329a019196SSage Weil if (!ordered && 24339a019196SSage Weil !test_range_bit(&BTRFS_I(src)->io_tree, off, off+len, 24349a019196SSage Weil EXTENT_DELALLOC, 0, NULL)) 2435f46b5a66SChristoph Hellwig break; 2436d0082371SJeff Mahoney unlock_extent(&BTRFS_I(src)->io_tree, off, off+len); 2437ae01a0abSYan Zheng if (ordered) 2438ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 24399a019196SSage Weil btrfs_wait_ordered_range(src, off, len); 2440f46b5a66SChristoph Hellwig } 2441f46b5a66SChristoph Hellwig 2442c5c9cd4dSSage Weil /* clone data */ 244333345d01SLi Zefan key.objectid = btrfs_ino(src); 2444ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 2445ae01a0abSYan Zheng key.offset = 0; 2446f46b5a66SChristoph Hellwig 2447f46b5a66SChristoph Hellwig while (1) { 2448f46b5a66SChristoph Hellwig /* 2449f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 2450f46b5a66SChristoph Hellwig * tree. 2451f46b5a66SChristoph Hellwig */ 2452362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 2453362a20c5SDavid Sterba 0, 0); 2454f46b5a66SChristoph Hellwig if (ret < 0) 2455f46b5a66SChristoph Hellwig goto out; 2456f46b5a66SChristoph Hellwig 2457ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2458ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 2459362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 2460f46b5a66SChristoph Hellwig if (ret < 0) 2461f46b5a66SChristoph Hellwig goto out; 2462f46b5a66SChristoph Hellwig if (ret > 0) 2463f46b5a66SChristoph Hellwig break; 2464ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2465f46b5a66SChristoph Hellwig } 2466f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 2467f46b5a66SChristoph Hellwig slot = path->slots[0]; 2468f46b5a66SChristoph Hellwig 2469ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 2470d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 247133345d01SLi Zefan key.objectid != btrfs_ino(src)) 2472f46b5a66SChristoph Hellwig break; 2473f46b5a66SChristoph Hellwig 2474c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 2475c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 2476c5c9cd4dSSage Weil int type; 247731840ae1SZheng Yan u32 size; 247831840ae1SZheng Yan struct btrfs_key new_key; 2479c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 2480c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 2481c5c9cd4dSSage Weil u8 comp; 2482b5384d48SSage Weil u64 endoff; 248331840ae1SZheng Yan 248431840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 248531840ae1SZheng Yan read_extent_buffer(leaf, buf, 248631840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 248731840ae1SZheng Yan size); 2488c5c9cd4dSSage Weil 2489c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 2490c5c9cd4dSSage Weil struct btrfs_file_extent_item); 2491c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 2492c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 2493c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2494c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2495d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 2496d397712bSChris Mason extent); 2497d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 2498d397712bSChris Mason extent); 2499c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 2500d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 2501d397712bSChris Mason extent); 2502c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2503c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 2504c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 2505c5c9cd4dSSage Weil extent); 2506c5c9cd4dSSage Weil } 2507b3b4aa74SDavid Sterba btrfs_release_path(path); 250831840ae1SZheng Yan 2509050006a7SSage Weil if (key.offset + datal <= off || 2510c5c9cd4dSSage Weil key.offset >= off+len) 2511c5c9cd4dSSage Weil goto next; 2512c5c9cd4dSSage Weil 251331840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 251433345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 25154d728ec7SLi Zefan if (off <= key.offset) 2516c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 25174d728ec7SLi Zefan else 25184d728ec7SLi Zefan new_key.offset = destoff; 2519c5c9cd4dSSage Weil 2520b6f3409bSSage Weil /* 2521b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 2522b6f3409bSSage Weil * 1 - add new extent 2523b6f3409bSSage Weil * 1 - inode update 2524b6f3409bSSage Weil */ 2525b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 2526a22285a6SYan, Zheng if (IS_ERR(trans)) { 2527a22285a6SYan, Zheng ret = PTR_ERR(trans); 2528a22285a6SYan, Zheng goto out; 2529a22285a6SYan, Zheng } 2530a22285a6SYan, Zheng 2531c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2532c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2533d72c0842SLi Zefan /* 2534d72c0842SLi Zefan * a | --- range to clone ---| b 2535d72c0842SLi Zefan * | ------------- extent ------------- | 2536d72c0842SLi Zefan */ 2537d72c0842SLi Zefan 2538d72c0842SLi Zefan /* substract range b */ 2539d72c0842SLi Zefan if (key.offset + datal > off + len) 2540d72c0842SLi Zefan datal = off + len - key.offset; 2541d72c0842SLi Zefan 2542d72c0842SLi Zefan /* substract range a */ 2543a22285a6SYan, Zheng if (off > key.offset) { 2544a22285a6SYan, Zheng datao += off - key.offset; 2545a22285a6SYan, Zheng datal -= off - key.offset; 2546a22285a6SYan, Zheng } 2547a22285a6SYan, Zheng 2548a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 2549a22285a6SYan, Zheng new_key.offset, 2550a22285a6SYan, Zheng new_key.offset + datal, 2551a22285a6SYan, Zheng &hint_byte, 1); 255279787eaaSJeff Mahoney if (ret) { 255379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 255479787eaaSJeff Mahoney ret); 255579787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 255679787eaaSJeff Mahoney goto out; 255779787eaaSJeff Mahoney } 2558a22285a6SYan, Zheng 255931840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 256031840ae1SZheng Yan &new_key, size); 256179787eaaSJeff Mahoney if (ret) { 256279787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 256379787eaaSJeff Mahoney ret); 256479787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 256579787eaaSJeff Mahoney goto out; 256679787eaaSJeff Mahoney } 256731840ae1SZheng Yan 256831840ae1SZheng Yan leaf = path->nodes[0]; 256931840ae1SZheng Yan slot = path->slots[0]; 257031840ae1SZheng Yan write_extent_buffer(leaf, buf, 257131840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 257231840ae1SZheng Yan size); 2573ae01a0abSYan Zheng 2574f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 2575f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 2576c5c9cd4dSSage Weil 2577c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 2578c5c9cd4dSSage Weil if (!disko) 2579c5c9cd4dSSage Weil datao = 0; 2580c5c9cd4dSSage Weil 2581c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 2582c5c9cd4dSSage Weil datao); 2583c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 2584c5c9cd4dSSage Weil datal); 2585c5c9cd4dSSage Weil if (disko) { 2586c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2587ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 25885d4f98a2SYan Zheng disko, diskl, 0, 2589f46b5a66SChristoph Hellwig root->root_key.objectid, 259033345d01SLi Zefan btrfs_ino(inode), 259166d7e7f0SArne Jansen new_key.offset - datao, 259266d7e7f0SArne Jansen 0); 259379787eaaSJeff Mahoney if (ret) { 259479787eaaSJeff Mahoney btrfs_abort_transaction(trans, 259579787eaaSJeff Mahoney root, 259679787eaaSJeff Mahoney ret); 259779787eaaSJeff Mahoney btrfs_end_transaction(trans, 259879787eaaSJeff Mahoney root); 259979787eaaSJeff Mahoney goto out; 260079787eaaSJeff Mahoney 260179787eaaSJeff Mahoney } 2602f46b5a66SChristoph Hellwig } 2603c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2604c5c9cd4dSSage Weil u64 skip = 0; 2605c5c9cd4dSSage Weil u64 trim = 0; 2606c5c9cd4dSSage Weil if (off > key.offset) { 2607c5c9cd4dSSage Weil skip = off - key.offset; 2608c5c9cd4dSSage Weil new_key.offset += skip; 260931840ae1SZheng Yan } 2610d397712bSChris Mason 2611c5c9cd4dSSage Weil if (key.offset + datal > off+len) 2612c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 2613d397712bSChris Mason 2614c5c9cd4dSSage Weil if (comp && (skip || trim)) { 2615c5c9cd4dSSage Weil ret = -EINVAL; 2616a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 2617c5c9cd4dSSage Weil goto out; 261831840ae1SZheng Yan } 2619c5c9cd4dSSage Weil size -= skip + trim; 2620c5c9cd4dSSage Weil datal -= skip + trim; 2621a22285a6SYan, Zheng 2622a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 2623a22285a6SYan, Zheng new_key.offset, 2624a22285a6SYan, Zheng new_key.offset + datal, 2625a22285a6SYan, Zheng &hint_byte, 1); 262679787eaaSJeff Mahoney if (ret) { 262779787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 262879787eaaSJeff Mahoney ret); 262979787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 263079787eaaSJeff Mahoney goto out; 263179787eaaSJeff Mahoney } 2632a22285a6SYan, Zheng 2633c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 2634c5c9cd4dSSage Weil &new_key, size); 263579787eaaSJeff Mahoney if (ret) { 263679787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 263779787eaaSJeff Mahoney ret); 263879787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 263979787eaaSJeff Mahoney goto out; 264079787eaaSJeff Mahoney } 2641c5c9cd4dSSage Weil 2642c5c9cd4dSSage Weil if (skip) { 2643d397712bSChris Mason u32 start = 2644d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 2645c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 2646c5c9cd4dSSage Weil datal); 2647c5c9cd4dSSage Weil } 2648c5c9cd4dSSage Weil 2649c5c9cd4dSSage Weil leaf = path->nodes[0]; 2650c5c9cd4dSSage Weil slot = path->slots[0]; 2651c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 2652c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 2653c5c9cd4dSSage Weil size); 2654c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2655c5c9cd4dSSage Weil } 2656c5c9cd4dSSage Weil 2657c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 2658b3b4aa74SDavid Sterba btrfs_release_path(path); 2659c5c9cd4dSSage Weil 26600c4d2d95SJosef Bacik inode_inc_iversion(inode); 2661a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 2662b5384d48SSage Weil 2663b5384d48SSage Weil /* 2664b5384d48SSage Weil * we round up to the block size at eof when 2665b5384d48SSage Weil * determining which extents to clone above, 2666b5384d48SSage Weil * but shouldn't round up the file size 2667b5384d48SSage Weil */ 2668b5384d48SSage Weil endoff = new_key.offset + datal; 26695f3888ffSLi Zefan if (endoff > destoff+olen) 26705f3888ffSLi Zefan endoff = destoff+olen; 2671b5384d48SSage Weil if (endoff > inode->i_size) 2672b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 2673b5384d48SSage Weil 2674a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 267579787eaaSJeff Mahoney if (ret) { 267679787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 2677a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 267879787eaaSJeff Mahoney goto out; 267979787eaaSJeff Mahoney } 268079787eaaSJeff Mahoney ret = btrfs_end_transaction(trans, root); 2681a22285a6SYan, Zheng } 2682c5c9cd4dSSage Weil next: 2683b3b4aa74SDavid Sterba btrfs_release_path(path); 2684ae01a0abSYan Zheng key.offset++; 2685ae01a0abSYan Zheng } 2686f46b5a66SChristoph Hellwig ret = 0; 2687f46b5a66SChristoph Hellwig out: 2688b3b4aa74SDavid Sterba btrfs_release_path(path); 2689d0082371SJeff Mahoney unlock_extent(&BTRFS_I(src)->io_tree, off, off+len); 2690f46b5a66SChristoph Hellwig out_unlock: 2691f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 2692f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 2693ae01a0abSYan Zheng vfree(buf); 2694ae01a0abSYan Zheng btrfs_free_path(path); 2695f46b5a66SChristoph Hellwig out_fput: 2696f46b5a66SChristoph Hellwig fput(src_file); 2697ab67b7c1SYan Zheng out_drop_write: 26982a79f17eSAl Viro mnt_drop_write_file(file); 2699f46b5a66SChristoph Hellwig return ret; 2700f46b5a66SChristoph Hellwig } 2701f46b5a66SChristoph Hellwig 27027a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 2703c5c9cd4dSSage Weil { 2704c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 2705c5c9cd4dSSage Weil 27067a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 2707c5c9cd4dSSage Weil return -EFAULT; 2708c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 2709c5c9cd4dSSage Weil args.src_length, args.dest_offset); 2710c5c9cd4dSSage Weil } 2711c5c9cd4dSSage Weil 2712f46b5a66SChristoph Hellwig /* 2713f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2714f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2715f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2716f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2717f46b5a66SChristoph Hellwig */ 2718b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 2719f46b5a66SChristoph Hellwig { 2720f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2721f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2722f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 27231ab86aedSSage Weil int ret; 2724f46b5a66SChristoph Hellwig 27251ab86aedSSage Weil ret = -EPERM; 2726df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 2727f46b5a66SChristoph Hellwig goto out; 27281ab86aedSSage Weil 27291ab86aedSSage Weil ret = -EINPROGRESS; 27301ab86aedSSage Weil if (file->private_data) 27311ab86aedSSage Weil goto out; 27329ca9ee09SSage Weil 2733b83cc969SLi Zefan ret = -EROFS; 2734b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2735b83cc969SLi Zefan goto out; 2736b83cc969SLi Zefan 2737a561be71SAl Viro ret = mnt_want_write_file(file); 2738c146afadSYan Zheng if (ret) 2739c146afadSYan Zheng goto out; 2740c146afadSYan Zheng 2741a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 27429ca9ee09SSage Weil 2743f46b5a66SChristoph Hellwig ret = -ENOMEM; 27447a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 2745abd30bb0STsutomu Itoh if (IS_ERR(trans)) 27461ab86aedSSage Weil goto out_drop; 27471ab86aedSSage Weil 27481ab86aedSSage Weil file->private_data = trans; 27491ab86aedSSage Weil return 0; 27501ab86aedSSage Weil 27511ab86aedSSage Weil out_drop: 2752a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 27532a79f17eSAl Viro mnt_drop_write_file(file); 2754f46b5a66SChristoph Hellwig out: 2755f46b5a66SChristoph Hellwig return ret; 2756f46b5a66SChristoph Hellwig } 2757f46b5a66SChristoph Hellwig 27586ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 27596ef5ed0dSJosef Bacik { 27606ef5ed0dSJosef Bacik struct inode *inode = fdentry(file)->d_inode; 27616ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 27626ef5ed0dSJosef Bacik struct btrfs_root *new_root; 27636ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 27646ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 27656ef5ed0dSJosef Bacik struct btrfs_path *path; 27666ef5ed0dSJosef Bacik struct btrfs_key location; 27676ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 27686ef5ed0dSJosef Bacik struct btrfs_super_block *disk_super; 27696ef5ed0dSJosef Bacik u64 features; 27706ef5ed0dSJosef Bacik u64 objectid = 0; 27716ef5ed0dSJosef Bacik u64 dir_id; 27726ef5ed0dSJosef Bacik 27736ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 27746ef5ed0dSJosef Bacik return -EPERM; 27756ef5ed0dSJosef Bacik 27766ef5ed0dSJosef Bacik if (copy_from_user(&objectid, argp, sizeof(objectid))) 27776ef5ed0dSJosef Bacik return -EFAULT; 27786ef5ed0dSJosef Bacik 27796ef5ed0dSJosef Bacik if (!objectid) 27806ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 27816ef5ed0dSJosef Bacik 27826ef5ed0dSJosef Bacik location.objectid = objectid; 27836ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 27846ef5ed0dSJosef Bacik location.offset = (u64)-1; 27856ef5ed0dSJosef Bacik 27866ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 27876ef5ed0dSJosef Bacik if (IS_ERR(new_root)) 27886ef5ed0dSJosef Bacik return PTR_ERR(new_root); 27896ef5ed0dSJosef Bacik 27906ef5ed0dSJosef Bacik if (btrfs_root_refs(&new_root->root_item) == 0) 27916ef5ed0dSJosef Bacik return -ENOENT; 27926ef5ed0dSJosef Bacik 27936ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 27946ef5ed0dSJosef Bacik if (!path) 27956ef5ed0dSJosef Bacik return -ENOMEM; 27966ef5ed0dSJosef Bacik path->leave_spinning = 1; 27976ef5ed0dSJosef Bacik 27986ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 279998d5dc13STsutomu Itoh if (IS_ERR(trans)) { 28006ef5ed0dSJosef Bacik btrfs_free_path(path); 280198d5dc13STsutomu Itoh return PTR_ERR(trans); 28026ef5ed0dSJosef Bacik } 28036ef5ed0dSJosef Bacik 28046c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 28056ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 28066ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 2807cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 28086ef5ed0dSJosef Bacik btrfs_free_path(path); 28096ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 28106ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 28116ef5ed0dSJosef Bacik "this isn't going to work\n"); 28126ef5ed0dSJosef Bacik return -ENOENT; 28136ef5ed0dSJosef Bacik } 28146ef5ed0dSJosef Bacik 28156ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 28166ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 28176ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 28186ef5ed0dSJosef Bacik btrfs_free_path(path); 28196ef5ed0dSJosef Bacik 28206c41761fSDavid Sterba disk_super = root->fs_info->super_copy; 28216ef5ed0dSJosef Bacik features = btrfs_super_incompat_flags(disk_super); 28226ef5ed0dSJosef Bacik if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { 28236ef5ed0dSJosef Bacik features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; 28246ef5ed0dSJosef Bacik btrfs_set_super_incompat_flags(disk_super, features); 28256ef5ed0dSJosef Bacik } 28266ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 28276ef5ed0dSJosef Bacik 28286ef5ed0dSJosef Bacik return 0; 28296ef5ed0dSJosef Bacik } 28306ef5ed0dSJosef Bacik 2831bf5fc093SJosef Bacik static void get_block_group_info(struct list_head *groups_list, 2832bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 2833bf5fc093SJosef Bacik { 2834bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 2835bf5fc093SJosef Bacik 2836bf5fc093SJosef Bacik space->total_bytes = 0; 2837bf5fc093SJosef Bacik space->used_bytes = 0; 2838bf5fc093SJosef Bacik space->flags = 0; 2839bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 2840bf5fc093SJosef Bacik space->flags = block_group->flags; 2841bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 2842bf5fc093SJosef Bacik space->used_bytes += 2843bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 2844bf5fc093SJosef Bacik } 2845bf5fc093SJosef Bacik } 2846bf5fc093SJosef Bacik 28471406e432SJosef Bacik long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 28481406e432SJosef Bacik { 28491406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 28501406e432SJosef Bacik struct btrfs_ioctl_space_info space; 28511406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 28527fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 285313f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 28541406e432SJosef Bacik struct btrfs_space_info *info; 2855bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 2856bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 2857bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 2858bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 2859bf5fc093SJosef Bacik int num_types = 4; 28607fde62bfSChris Mason int alloc_size; 28611406e432SJosef Bacik int ret = 0; 286251788b1bSDan Rosenberg u64 slot_count = 0; 2863bf5fc093SJosef Bacik int i, c; 28641406e432SJosef Bacik 28651406e432SJosef Bacik if (copy_from_user(&space_args, 28661406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 28671406e432SJosef Bacik sizeof(space_args))) 28681406e432SJosef Bacik return -EFAULT; 28691406e432SJosef Bacik 2870bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2871bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2872bf5fc093SJosef Bacik 2873bf5fc093SJosef Bacik info = NULL; 28747fde62bfSChris Mason rcu_read_lock(); 2875bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2876bf5fc093SJosef Bacik list) { 2877bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2878bf5fc093SJosef Bacik info = tmp; 2879bf5fc093SJosef Bacik break; 2880bf5fc093SJosef Bacik } 2881bf5fc093SJosef Bacik } 28827fde62bfSChris Mason rcu_read_unlock(); 28831406e432SJosef Bacik 2884bf5fc093SJosef Bacik if (!info) 2885bf5fc093SJosef Bacik continue; 2886bf5fc093SJosef Bacik 2887bf5fc093SJosef Bacik down_read(&info->groups_sem); 2888bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2889bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 2890bf5fc093SJosef Bacik slot_count++; 2891bf5fc093SJosef Bacik } 2892bf5fc093SJosef Bacik up_read(&info->groups_sem); 2893bf5fc093SJosef Bacik } 2894bf5fc093SJosef Bacik 28957fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 28967fde62bfSChris Mason if (space_args.space_slots == 0) { 28977fde62bfSChris Mason space_args.total_spaces = slot_count; 28987fde62bfSChris Mason goto out; 28997fde62bfSChris Mason } 2900bf5fc093SJosef Bacik 290151788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 2902bf5fc093SJosef Bacik 29037fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 2904bf5fc093SJosef Bacik 29057fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 29067fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 29077fde62bfSChris Mason */ 29087fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 29097fde62bfSChris Mason return -ENOMEM; 29107fde62bfSChris Mason 29117fde62bfSChris Mason space_args.total_spaces = 0; 29127fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 29137fde62bfSChris Mason if (!dest) 29147fde62bfSChris Mason return -ENOMEM; 29157fde62bfSChris Mason dest_orig = dest; 29167fde62bfSChris Mason 29177fde62bfSChris Mason /* now we have a buffer to copy into */ 2918bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2919bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2920bf5fc093SJosef Bacik 292151788b1bSDan Rosenberg if (!slot_count) 292251788b1bSDan Rosenberg break; 292351788b1bSDan Rosenberg 2924bf5fc093SJosef Bacik info = NULL; 29251406e432SJosef Bacik rcu_read_lock(); 2926bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2927bf5fc093SJosef Bacik list) { 2928bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2929bf5fc093SJosef Bacik info = tmp; 29307fde62bfSChris Mason break; 2931bf5fc093SJosef Bacik } 2932bf5fc093SJosef Bacik } 2933bf5fc093SJosef Bacik rcu_read_unlock(); 29347fde62bfSChris Mason 2935bf5fc093SJosef Bacik if (!info) 2936bf5fc093SJosef Bacik continue; 2937bf5fc093SJosef Bacik down_read(&info->groups_sem); 2938bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2939bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 2940bf5fc093SJosef Bacik get_block_group_info(&info->block_groups[c], 2941bf5fc093SJosef Bacik &space); 29427fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 29431406e432SJosef Bacik dest++; 29441406e432SJosef Bacik space_args.total_spaces++; 294551788b1bSDan Rosenberg slot_count--; 29461406e432SJosef Bacik } 294751788b1bSDan Rosenberg if (!slot_count) 294851788b1bSDan Rosenberg break; 2949bf5fc093SJosef Bacik } 2950bf5fc093SJosef Bacik up_read(&info->groups_sem); 2951bf5fc093SJosef Bacik } 29521406e432SJosef Bacik 29532eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 29547fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 29557fde62bfSChris Mason 29567fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 29577fde62bfSChris Mason ret = -EFAULT; 29587fde62bfSChris Mason 29597fde62bfSChris Mason kfree(dest_orig); 29607fde62bfSChris Mason out: 29617fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 29621406e432SJosef Bacik ret = -EFAULT; 29631406e432SJosef Bacik 29641406e432SJosef Bacik return ret; 29651406e432SJosef Bacik } 29661406e432SJosef Bacik 2967f46b5a66SChristoph Hellwig /* 2968f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2969f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2970f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2971f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2972f46b5a66SChristoph Hellwig */ 2973f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 2974f46b5a66SChristoph Hellwig { 2975f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2976f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2977f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2978f46b5a66SChristoph Hellwig 2979f46b5a66SChristoph Hellwig trans = file->private_data; 29801ab86aedSSage Weil if (!trans) 29811ab86aedSSage Weil return -EINVAL; 2982b214107eSChristoph Hellwig file->private_data = NULL; 29839ca9ee09SSage Weil 29841ab86aedSSage Weil btrfs_end_transaction(trans, root); 29851ab86aedSSage Weil 2986a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 29879ca9ee09SSage Weil 29882a79f17eSAl Viro mnt_drop_write_file(file); 29891ab86aedSSage Weil return 0; 2990f46b5a66SChristoph Hellwig } 2991f46b5a66SChristoph Hellwig 299246204592SSage Weil static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp) 299346204592SSage Weil { 299446204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 299546204592SSage Weil struct btrfs_trans_handle *trans; 299646204592SSage Weil u64 transid; 2997db5b493aSTsutomu Itoh int ret; 299846204592SSage Weil 299946204592SSage Weil trans = btrfs_start_transaction(root, 0); 300098d5dc13STsutomu Itoh if (IS_ERR(trans)) 300198d5dc13STsutomu Itoh return PTR_ERR(trans); 300246204592SSage Weil transid = trans->transid; 3003db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 30048b2b2d3cSTsutomu Itoh if (ret) { 30058b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 3006db5b493aSTsutomu Itoh return ret; 30078b2b2d3cSTsutomu Itoh } 300846204592SSage Weil 300946204592SSage Weil if (argp) 301046204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 301146204592SSage Weil return -EFAULT; 301246204592SSage Weil return 0; 301346204592SSage Weil } 301446204592SSage Weil 301546204592SSage Weil static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) 301646204592SSage Weil { 301746204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 301846204592SSage Weil u64 transid; 301946204592SSage Weil 302046204592SSage Weil if (argp) { 302146204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 302246204592SSage Weil return -EFAULT; 302346204592SSage Weil } else { 302446204592SSage Weil transid = 0; /* current trans */ 302546204592SSage Weil } 302646204592SSage Weil return btrfs_wait_for_commit(root, transid); 302746204592SSage Weil } 302846204592SSage Weil 3029475f6387SJan Schmidt static long btrfs_ioctl_scrub(struct btrfs_root *root, void __user *arg) 3030475f6387SJan Schmidt { 3031475f6387SJan Schmidt int ret; 3032475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3033475f6387SJan Schmidt 3034475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3035475f6387SJan Schmidt return -EPERM; 3036475f6387SJan Schmidt 3037475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3038475f6387SJan Schmidt if (IS_ERR(sa)) 3039475f6387SJan Schmidt return PTR_ERR(sa); 3040475f6387SJan Schmidt 3041475f6387SJan Schmidt ret = btrfs_scrub_dev(root, sa->devid, sa->start, sa->end, 30428628764eSArne Jansen &sa->progress, sa->flags & BTRFS_SCRUB_READONLY); 3043475f6387SJan Schmidt 3044475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3045475f6387SJan Schmidt ret = -EFAULT; 3046475f6387SJan Schmidt 3047475f6387SJan Schmidt kfree(sa); 3048475f6387SJan Schmidt return ret; 3049475f6387SJan Schmidt } 3050475f6387SJan Schmidt 3051475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 3052475f6387SJan Schmidt { 3053475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3054475f6387SJan Schmidt return -EPERM; 3055475f6387SJan Schmidt 3056475f6387SJan Schmidt return btrfs_scrub_cancel(root); 3057475f6387SJan Schmidt } 3058475f6387SJan Schmidt 3059475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 3060475f6387SJan Schmidt void __user *arg) 3061475f6387SJan Schmidt { 3062475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3063475f6387SJan Schmidt int ret; 3064475f6387SJan Schmidt 3065475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3066475f6387SJan Schmidt return -EPERM; 3067475f6387SJan Schmidt 3068475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3069475f6387SJan Schmidt if (IS_ERR(sa)) 3070475f6387SJan Schmidt return PTR_ERR(sa); 3071475f6387SJan Schmidt 3072475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 3073475f6387SJan Schmidt 3074475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3075475f6387SJan Schmidt ret = -EFAULT; 3076475f6387SJan Schmidt 3077475f6387SJan Schmidt kfree(sa); 3078475f6387SJan Schmidt return ret; 3079475f6387SJan Schmidt } 3080475f6387SJan Schmidt 3081c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 3082c11d2c23SStefan Behrens void __user *arg, int reset_after_read) 3083c11d2c23SStefan Behrens { 3084c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3085c11d2c23SStefan Behrens int ret; 3086c11d2c23SStefan Behrens 3087c11d2c23SStefan Behrens if (reset_after_read && !capable(CAP_SYS_ADMIN)) 3088c11d2c23SStefan Behrens return -EPERM; 3089c11d2c23SStefan Behrens 3090c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3091c11d2c23SStefan Behrens if (IS_ERR(sa)) 3092c11d2c23SStefan Behrens return PTR_ERR(sa); 3093c11d2c23SStefan Behrens 3094c11d2c23SStefan Behrens ret = btrfs_get_dev_stats(root, sa, reset_after_read); 3095c11d2c23SStefan Behrens 3096c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 3097c11d2c23SStefan Behrens ret = -EFAULT; 3098c11d2c23SStefan Behrens 3099c11d2c23SStefan Behrens kfree(sa); 3100c11d2c23SStefan Behrens return ret; 3101c11d2c23SStefan Behrens } 3102c11d2c23SStefan Behrens 3103d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3104d7728c96SJan Schmidt { 3105d7728c96SJan Schmidt int ret = 0; 3106d7728c96SJan Schmidt int i; 3107740c3d22SChris Mason u64 rel_ptr; 3108d7728c96SJan Schmidt int size; 3109806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3110d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3111d7728c96SJan Schmidt struct btrfs_path *path; 3112d7728c96SJan Schmidt 3113d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3114d7728c96SJan Schmidt return -EPERM; 3115d7728c96SJan Schmidt 3116d7728c96SJan Schmidt path = btrfs_alloc_path(); 3117d7728c96SJan Schmidt if (!path) { 3118d7728c96SJan Schmidt ret = -ENOMEM; 3119d7728c96SJan Schmidt goto out; 3120d7728c96SJan Schmidt } 3121d7728c96SJan Schmidt 3122d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3123d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3124d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3125d7728c96SJan Schmidt ipa = NULL; 3126d7728c96SJan Schmidt goto out; 3127d7728c96SJan Schmidt } 3128d7728c96SJan Schmidt 3129d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3130d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3131d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3132d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3133d7728c96SJan Schmidt ipath = NULL; 3134d7728c96SJan Schmidt goto out; 3135d7728c96SJan Schmidt } 3136d7728c96SJan Schmidt 3137d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3138d7728c96SJan Schmidt if (ret < 0) 3139d7728c96SJan Schmidt goto out; 3140d7728c96SJan Schmidt 3141d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3142745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3143745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3144740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3145d7728c96SJan Schmidt } 3146d7728c96SJan Schmidt 3147745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 3148745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 3149d7728c96SJan Schmidt if (ret) { 3150d7728c96SJan Schmidt ret = -EFAULT; 3151d7728c96SJan Schmidt goto out; 3152d7728c96SJan Schmidt } 3153d7728c96SJan Schmidt 3154d7728c96SJan Schmidt out: 3155d7728c96SJan Schmidt btrfs_free_path(path); 3156d7728c96SJan Schmidt free_ipath(ipath); 3157d7728c96SJan Schmidt kfree(ipa); 3158d7728c96SJan Schmidt 3159d7728c96SJan Schmidt return ret; 3160d7728c96SJan Schmidt } 3161d7728c96SJan Schmidt 3162d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3163d7728c96SJan Schmidt { 3164d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3165d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3166d7728c96SJan Schmidt 3167d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3168d7728c96SJan Schmidt inodes->bytes_left -= c; 3169d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3170d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3171d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3172d7728c96SJan Schmidt inodes->elem_cnt += 3; 3173d7728c96SJan Schmidt } else { 3174d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3175d7728c96SJan Schmidt inodes->bytes_left = 0; 3176d7728c96SJan Schmidt inodes->elem_missed += 3; 3177d7728c96SJan Schmidt } 3178d7728c96SJan Schmidt 3179d7728c96SJan Schmidt return 0; 3180d7728c96SJan Schmidt } 3181d7728c96SJan Schmidt 3182d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 3183d7728c96SJan Schmidt void __user *arg) 3184d7728c96SJan Schmidt { 3185d7728c96SJan Schmidt int ret = 0; 3186d7728c96SJan Schmidt int size; 31874692cf58SJan Schmidt u64 extent_item_pos; 3188d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3189d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3190d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3191d7728c96SJan Schmidt struct btrfs_key key; 3192d7728c96SJan Schmidt 3193d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3194d7728c96SJan Schmidt return -EPERM; 3195d7728c96SJan Schmidt 3196d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 3197d7728c96SJan Schmidt if (IS_ERR(loi)) { 3198d7728c96SJan Schmidt ret = PTR_ERR(loi); 3199d7728c96SJan Schmidt loi = NULL; 3200d7728c96SJan Schmidt goto out; 3201d7728c96SJan Schmidt } 3202d7728c96SJan Schmidt 3203d7728c96SJan Schmidt path = btrfs_alloc_path(); 3204d7728c96SJan Schmidt if (!path) { 3205d7728c96SJan Schmidt ret = -ENOMEM; 3206d7728c96SJan Schmidt goto out; 3207d7728c96SJan Schmidt } 3208d7728c96SJan Schmidt 3209d7728c96SJan Schmidt size = min_t(u32, loi->size, 4096); 3210d7728c96SJan Schmidt inodes = init_data_container(size); 3211d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3212d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3213d7728c96SJan Schmidt inodes = NULL; 3214d7728c96SJan Schmidt goto out; 3215d7728c96SJan Schmidt } 3216d7728c96SJan Schmidt 3217d7728c96SJan Schmidt ret = extent_from_logical(root->fs_info, loi->logical, path, &key); 32184692cf58SJan Schmidt btrfs_release_path(path); 3219d7728c96SJan Schmidt 3220d7728c96SJan Schmidt if (ret & BTRFS_EXTENT_FLAG_TREE_BLOCK) 3221d7728c96SJan Schmidt ret = -ENOENT; 3222d7728c96SJan Schmidt if (ret < 0) 3223d7728c96SJan Schmidt goto out; 3224d7728c96SJan Schmidt 32254692cf58SJan Schmidt extent_item_pos = loi->logical - key.objectid; 32267a3ae2f8SJan Schmidt ret = iterate_extent_inodes(root->fs_info, key.objectid, 32277a3ae2f8SJan Schmidt extent_item_pos, 0, build_ino_list, 32284692cf58SJan Schmidt inodes); 3229d7728c96SJan Schmidt 3230d7728c96SJan Schmidt if (ret < 0) 3231d7728c96SJan Schmidt goto out; 3232d7728c96SJan Schmidt 3233745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 3234745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 3235d7728c96SJan Schmidt if (ret) 3236d7728c96SJan Schmidt ret = -EFAULT; 3237d7728c96SJan Schmidt 3238d7728c96SJan Schmidt out: 3239d7728c96SJan Schmidt btrfs_free_path(path); 3240d7728c96SJan Schmidt kfree(inodes); 3241d7728c96SJan Schmidt kfree(loi); 3242d7728c96SJan Schmidt 3243d7728c96SJan Schmidt return ret; 3244d7728c96SJan Schmidt } 3245d7728c96SJan Schmidt 324619a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 3247c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3248c9e9f97bSIlya Dryomov { 3249c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3250c9e9f97bSIlya Dryomov 3251c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3252c9e9f97bSIlya Dryomov 3253837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 3254837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3255837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3256837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3257a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3258a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3259837d5b6eSIlya Dryomov 3260c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3261c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3262c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 326319a39dceSIlya Dryomov 326419a39dceSIlya Dryomov if (lock) { 326519a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 326619a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 326719a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 326819a39dceSIlya Dryomov } else { 326919a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 327019a39dceSIlya Dryomov } 3271c9e9f97bSIlya Dryomov } 3272c9e9f97bSIlya Dryomov 32739ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3274c9e9f97bSIlya Dryomov { 32759ba1f6e4SLiu Bo struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 3276c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3277c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3278c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3279c9e9f97bSIlya Dryomov int ret; 3280c9e9f97bSIlya Dryomov 3281c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3282c9e9f97bSIlya Dryomov return -EPERM; 3283c9e9f97bSIlya Dryomov 3284c9e9f97bSIlya Dryomov if (fs_info->sb->s_flags & MS_RDONLY) 3285c9e9f97bSIlya Dryomov return -EROFS; 3286c9e9f97bSIlya Dryomov 32879ba1f6e4SLiu Bo ret = mnt_want_write(file->f_path.mnt); 32889ba1f6e4SLiu Bo if (ret) 32899ba1f6e4SLiu Bo return ret; 32909ba1f6e4SLiu Bo 3291c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 3292c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3293c9e9f97bSIlya Dryomov 3294c9e9f97bSIlya Dryomov if (arg) { 3295c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 3296c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 3297c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 3298c9e9f97bSIlya Dryomov goto out; 3299c9e9f97bSIlya Dryomov } 3300de322263SIlya Dryomov 3301de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3302de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3303de322263SIlya Dryomov ret = -ENOTCONN; 3304de322263SIlya Dryomov goto out_bargs; 3305de322263SIlya Dryomov } 3306de322263SIlya Dryomov 3307de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3308de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3309de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3310de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3311de322263SIlya Dryomov 3312de322263SIlya Dryomov goto do_balance; 3313de322263SIlya Dryomov } 3314c9e9f97bSIlya Dryomov } else { 3315c9e9f97bSIlya Dryomov bargs = NULL; 3316c9e9f97bSIlya Dryomov } 3317c9e9f97bSIlya Dryomov 3318837d5b6eSIlya Dryomov if (fs_info->balance_ctl) { 3319837d5b6eSIlya Dryomov ret = -EINPROGRESS; 3320837d5b6eSIlya Dryomov goto out_bargs; 3321837d5b6eSIlya Dryomov } 3322837d5b6eSIlya Dryomov 3323c9e9f97bSIlya Dryomov bctl = kzalloc(sizeof(*bctl), GFP_NOFS); 3324c9e9f97bSIlya Dryomov if (!bctl) { 3325c9e9f97bSIlya Dryomov ret = -ENOMEM; 3326c9e9f97bSIlya Dryomov goto out_bargs; 3327c9e9f97bSIlya Dryomov } 3328c9e9f97bSIlya Dryomov 3329c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 3330c9e9f97bSIlya Dryomov if (arg) { 3331c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 3332c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 3333c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 3334c9e9f97bSIlya Dryomov 3335c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 3336f43ffb60SIlya Dryomov } else { 3337f43ffb60SIlya Dryomov /* balance everything - no filters */ 3338f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 3339c9e9f97bSIlya Dryomov } 3340c9e9f97bSIlya Dryomov 3341de322263SIlya Dryomov do_balance: 3342c9e9f97bSIlya Dryomov ret = btrfs_balance(bctl, bargs); 3343c9e9f97bSIlya Dryomov /* 3344837d5b6eSIlya Dryomov * bctl is freed in __cancel_balance or in free_fs_info if 3345837d5b6eSIlya Dryomov * restriper was paused all the way until unmount 3346c9e9f97bSIlya Dryomov */ 3347c9e9f97bSIlya Dryomov if (arg) { 3348c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 3349c9e9f97bSIlya Dryomov ret = -EFAULT; 3350c9e9f97bSIlya Dryomov } 3351c9e9f97bSIlya Dryomov 3352c9e9f97bSIlya Dryomov out_bargs: 3353c9e9f97bSIlya Dryomov kfree(bargs); 3354c9e9f97bSIlya Dryomov out: 3355c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3356c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 33579ba1f6e4SLiu Bo mnt_drop_write(file->f_path.mnt); 3358c9e9f97bSIlya Dryomov return ret; 3359c9e9f97bSIlya Dryomov } 3360c9e9f97bSIlya Dryomov 3361837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 3362837d5b6eSIlya Dryomov { 3363837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3364837d5b6eSIlya Dryomov return -EPERM; 3365837d5b6eSIlya Dryomov 3366837d5b6eSIlya Dryomov switch (cmd) { 3367837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 3368837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 3369a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 3370a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 3371837d5b6eSIlya Dryomov } 3372837d5b6eSIlya Dryomov 3373837d5b6eSIlya Dryomov return -EINVAL; 3374837d5b6eSIlya Dryomov } 3375837d5b6eSIlya Dryomov 337619a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 337719a39dceSIlya Dryomov void __user *arg) 337819a39dceSIlya Dryomov { 337919a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 338019a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 338119a39dceSIlya Dryomov int ret = 0; 338219a39dceSIlya Dryomov 338319a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 338419a39dceSIlya Dryomov return -EPERM; 338519a39dceSIlya Dryomov 338619a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 338719a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 338819a39dceSIlya Dryomov ret = -ENOTCONN; 338919a39dceSIlya Dryomov goto out; 339019a39dceSIlya Dryomov } 339119a39dceSIlya Dryomov 339219a39dceSIlya Dryomov bargs = kzalloc(sizeof(*bargs), GFP_NOFS); 339319a39dceSIlya Dryomov if (!bargs) { 339419a39dceSIlya Dryomov ret = -ENOMEM; 339519a39dceSIlya Dryomov goto out; 339619a39dceSIlya Dryomov } 339719a39dceSIlya Dryomov 339819a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 339919a39dceSIlya Dryomov 340019a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 340119a39dceSIlya Dryomov ret = -EFAULT; 340219a39dceSIlya Dryomov 340319a39dceSIlya Dryomov kfree(bargs); 340419a39dceSIlya Dryomov out: 340519a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 340619a39dceSIlya Dryomov return ret; 340719a39dceSIlya Dryomov } 340819a39dceSIlya Dryomov 34098ea05e3aSAlexander Block static long btrfs_ioctl_set_received_subvol(struct file *file, 34108ea05e3aSAlexander Block void __user *arg) 34118ea05e3aSAlexander Block { 34128ea05e3aSAlexander Block struct btrfs_ioctl_received_subvol_args *sa = NULL; 34138ea05e3aSAlexander Block struct inode *inode = fdentry(file)->d_inode; 34148ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 34158ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 34168ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 34178ea05e3aSAlexander Block struct timespec ct = CURRENT_TIME; 34188ea05e3aSAlexander Block int ret = 0; 34198ea05e3aSAlexander Block 34208ea05e3aSAlexander Block ret = mnt_want_write_file(file); 34218ea05e3aSAlexander Block if (ret < 0) 34228ea05e3aSAlexander Block return ret; 34238ea05e3aSAlexander Block 34248ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 34258ea05e3aSAlexander Block 34268ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 34278ea05e3aSAlexander Block ret = -EINVAL; 34288ea05e3aSAlexander Block goto out; 34298ea05e3aSAlexander Block } 34308ea05e3aSAlexander Block 34318ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 34328ea05e3aSAlexander Block ret = -EROFS; 34338ea05e3aSAlexander Block goto out; 34348ea05e3aSAlexander Block } 34358ea05e3aSAlexander Block 34368ea05e3aSAlexander Block if (!inode_owner_or_capable(inode)) { 34378ea05e3aSAlexander Block ret = -EACCES; 34388ea05e3aSAlexander Block goto out; 34398ea05e3aSAlexander Block } 34408ea05e3aSAlexander Block 34418ea05e3aSAlexander Block sa = memdup_user(arg, sizeof(*sa)); 34428ea05e3aSAlexander Block if (IS_ERR(sa)) { 34438ea05e3aSAlexander Block ret = PTR_ERR(sa); 34448ea05e3aSAlexander Block sa = NULL; 34458ea05e3aSAlexander Block goto out; 34468ea05e3aSAlexander Block } 34478ea05e3aSAlexander Block 34488ea05e3aSAlexander Block trans = btrfs_start_transaction(root, 1); 34498ea05e3aSAlexander Block if (IS_ERR(trans)) { 34508ea05e3aSAlexander Block ret = PTR_ERR(trans); 34518ea05e3aSAlexander Block trans = NULL; 34528ea05e3aSAlexander Block goto out; 34538ea05e3aSAlexander Block } 34548ea05e3aSAlexander Block 34558ea05e3aSAlexander Block sa->rtransid = trans->transid; 34568ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 34578ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 34588ea05e3aSAlexander Block 34598ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 34608ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 34618ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 34628ea05e3aSAlexander Block root_item->stime.sec = cpu_to_le64(sa->stime.sec); 34638ea05e3aSAlexander Block root_item->stime.nsec = cpu_to_le32(sa->stime.nsec); 34648ea05e3aSAlexander Block root_item->rtime.sec = cpu_to_le64(sa->rtime.sec); 34658ea05e3aSAlexander Block root_item->rtime.nsec = cpu_to_le32(sa->rtime.nsec); 34668ea05e3aSAlexander Block 34678ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 34688ea05e3aSAlexander Block &root->root_key, &root->root_item); 34698ea05e3aSAlexander Block if (ret < 0) { 34708ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 34718ea05e3aSAlexander Block trans = NULL; 34728ea05e3aSAlexander Block goto out; 34738ea05e3aSAlexander Block } else { 34748ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 34758ea05e3aSAlexander Block if (ret < 0) 34768ea05e3aSAlexander Block goto out; 34778ea05e3aSAlexander Block } 34788ea05e3aSAlexander Block 34798ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 34808ea05e3aSAlexander Block if (ret) 34818ea05e3aSAlexander Block ret = -EFAULT; 34828ea05e3aSAlexander Block 34838ea05e3aSAlexander Block out: 34848ea05e3aSAlexander Block kfree(sa); 34858ea05e3aSAlexander Block up_write(&root->fs_info->subvol_sem); 34868ea05e3aSAlexander Block mnt_drop_write_file(file); 34878ea05e3aSAlexander Block return ret; 34888ea05e3aSAlexander Block } 34898ea05e3aSAlexander Block 3490f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 3491f46b5a66SChristoph Hellwig cmd, unsigned long arg) 3492f46b5a66SChristoph Hellwig { 3493f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 34944bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 3495f46b5a66SChristoph Hellwig 3496f46b5a66SChristoph Hellwig switch (cmd) { 34976cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 34986cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 34996cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 35006cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 35016cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 35026cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 3503f7039b1dSLi Dongyang case FITRIM: 3504f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 3505f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 3506fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 3507fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 3508fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 35093de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 3510fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 351176dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 351276dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 35130caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 35140caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 35150caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 35160caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 35176ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 35186ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 3519f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 35201e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 35211e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 35221e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 3523f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 35244bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 3525f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 35264bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 3527f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 35284bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 3529475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 3530475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 3531475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 3532475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 3533f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 35349ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 3535f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 3536c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 3537c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 35387a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 3539f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 3540f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 3541f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 3542f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 3543ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 3544ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 3545ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 3546ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 3547d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 3548d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 3549d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 3550d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 35511406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 35521406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 3553f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 3554f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 3555f46b5a66SChristoph Hellwig return 0; 355646204592SSage Weil case BTRFS_IOC_START_SYNC: 355746204592SSage Weil return btrfs_ioctl_start_sync(file, argp); 355846204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 355946204592SSage Weil return btrfs_ioctl_wait_sync(file, argp); 3560475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 3561475f6387SJan Schmidt return btrfs_ioctl_scrub(root, argp); 3562475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 3563475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 3564475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 3565475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 3566c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 35679ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 3568837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 3569837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 357019a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 357119a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 35728ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 35738ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 3574c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 3575c11d2c23SStefan Behrens return btrfs_ioctl_get_dev_stats(root, argp, 0); 3576c11d2c23SStefan Behrens case BTRFS_IOC_GET_AND_RESET_DEV_STATS: 3577c11d2c23SStefan Behrens return btrfs_ioctl_get_dev_stats(root, argp, 1); 3578f46b5a66SChristoph Hellwig } 3579f46b5a66SChristoph Hellwig 3580f46b5a66SChristoph Hellwig return -ENOTTY; 3581f46b5a66SChristoph Hellwig } 3582