1f46b5a66SChristoph Hellwig /* 2f46b5a66SChristoph Hellwig * Copyright (C) 2007 Oracle. All rights reserved. 3f46b5a66SChristoph Hellwig * 4f46b5a66SChristoph Hellwig * This program is free software; you can redistribute it and/or 5f46b5a66SChristoph Hellwig * modify it under the terms of the GNU General Public 6f46b5a66SChristoph Hellwig * License v2 as published by the Free Software Foundation. 7f46b5a66SChristoph Hellwig * 8f46b5a66SChristoph Hellwig * This program is distributed in the hope that it will be useful, 9f46b5a66SChristoph Hellwig * but WITHOUT ANY WARRANTY; without even the implied warranty of 10f46b5a66SChristoph Hellwig * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11f46b5a66SChristoph Hellwig * General Public License for more details. 12f46b5a66SChristoph Hellwig * 13f46b5a66SChristoph Hellwig * You should have received a copy of the GNU General Public 14f46b5a66SChristoph Hellwig * License along with this program; if not, write to the 15f46b5a66SChristoph Hellwig * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16f46b5a66SChristoph Hellwig * Boston, MA 021110-1307, USA. 17f46b5a66SChristoph Hellwig */ 18f46b5a66SChristoph Hellwig 19f46b5a66SChristoph Hellwig #include <linux/kernel.h> 20f46b5a66SChristoph Hellwig #include <linux/bio.h> 21f46b5a66SChristoph Hellwig #include <linux/buffer_head.h> 22f46b5a66SChristoph Hellwig #include <linux/file.h> 23f46b5a66SChristoph Hellwig #include <linux/fs.h> 24cb8e7090SChristoph Hellwig #include <linux/fsnotify.h> 25f46b5a66SChristoph Hellwig #include <linux/pagemap.h> 26f46b5a66SChristoph Hellwig #include <linux/highmem.h> 27f46b5a66SChristoph Hellwig #include <linux/time.h> 28f46b5a66SChristoph Hellwig #include <linux/init.h> 29f46b5a66SChristoph Hellwig #include <linux/string.h> 30f46b5a66SChristoph Hellwig #include <linux/backing-dev.h> 31cb8e7090SChristoph Hellwig #include <linux/mount.h> 32f46b5a66SChristoph Hellwig #include <linux/mpage.h> 33cb8e7090SChristoph Hellwig #include <linux/namei.h> 34f46b5a66SChristoph Hellwig #include <linux/swap.h> 35f46b5a66SChristoph Hellwig #include <linux/writeback.h> 36f46b5a66SChristoph Hellwig #include <linux/statfs.h> 37f46b5a66SChristoph Hellwig #include <linux/compat.h> 38f46b5a66SChristoph Hellwig #include <linux/bit_spinlock.h> 39cb8e7090SChristoph Hellwig #include <linux/security.h> 40f46b5a66SChristoph Hellwig #include <linux/xattr.h> 417ea394f1SYan Zheng #include <linux/vmalloc.h> 425a0e3ad6STejun Heo #include <linux/slab.h> 43f7039b1dSLi Dongyang #include <linux/blkdev.h> 448ea05e3aSAlexander Block #include <linux/uuid.h> 454b4e25f2SChris Mason #include "compat.h" 46f46b5a66SChristoph Hellwig #include "ctree.h" 47f46b5a66SChristoph Hellwig #include "disk-io.h" 48f46b5a66SChristoph Hellwig #include "transaction.h" 49f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 50f46b5a66SChristoph Hellwig #include "ioctl.h" 51f46b5a66SChristoph Hellwig #include "print-tree.h" 52f46b5a66SChristoph Hellwig #include "volumes.h" 53925baeddSChris Mason #include "locking.h" 54581bb050SLi Zefan #include "inode-map.h" 55d7728c96SJan Schmidt #include "backref.h" 56606686eeSJosef Bacik #include "rcu-string.h" 5731db9f7cSAlexander Block #include "send.h" 58f46b5a66SChristoph Hellwig 596cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 606cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 616cbff00fSChristoph Hellwig { 626cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 636cbff00fSChristoph Hellwig return flags; 646cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 656cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 666cbff00fSChristoph Hellwig else 676cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 686cbff00fSChristoph Hellwig } 69f46b5a66SChristoph Hellwig 706cbff00fSChristoph Hellwig /* 716cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 726cbff00fSChristoph Hellwig */ 736cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 746cbff00fSChristoph Hellwig { 756cbff00fSChristoph Hellwig unsigned int iflags = 0; 766cbff00fSChristoph Hellwig 776cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 786cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 796cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 806cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 816cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 826cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 836cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 846cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 856cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 866cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 876cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 886cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 89d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 90d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 91d0092bddSLi Zefan 92d0092bddSLi Zefan if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) 93d0092bddSLi Zefan iflags |= FS_COMPR_FL; 94d0092bddSLi Zefan else if (flags & BTRFS_INODE_NOCOMPRESS) 95d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 966cbff00fSChristoph Hellwig 976cbff00fSChristoph Hellwig return iflags; 986cbff00fSChristoph Hellwig } 996cbff00fSChristoph Hellwig 1006cbff00fSChristoph Hellwig /* 1016cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1026cbff00fSChristoph Hellwig */ 1036cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 1046cbff00fSChristoph Hellwig { 1056cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1066cbff00fSChristoph Hellwig 1076cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 1086cbff00fSChristoph Hellwig 1096cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 1106cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 1116cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1126cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1136cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1146cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1156cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1166cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1176cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1186cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1196cbff00fSChristoph Hellwig } 1206cbff00fSChristoph Hellwig 1216cbff00fSChristoph Hellwig /* 1226cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1236cbff00fSChristoph Hellwig * 124e27425d6SJosef Bacik * Currently only the compression flags and the cow flags are inherited. 1256cbff00fSChristoph Hellwig */ 1266cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1276cbff00fSChristoph Hellwig { 1280b4dcea5SChris Mason unsigned int flags; 1290b4dcea5SChris Mason 1300b4dcea5SChris Mason if (!dir) 1310b4dcea5SChris Mason return; 1320b4dcea5SChris Mason 1330b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1346cbff00fSChristoph Hellwig 135e27425d6SJosef Bacik if (flags & BTRFS_INODE_NOCOMPRESS) { 136e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; 137e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; 138e27425d6SJosef Bacik } else if (flags & BTRFS_INODE_COMPRESS) { 139e27425d6SJosef Bacik BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; 140e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; 141e27425d6SJosef Bacik } 1426cbff00fSChristoph Hellwig 143e27425d6SJosef Bacik if (flags & BTRFS_INODE_NODATACOW) 144e27425d6SJosef Bacik BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; 145e27425d6SJosef Bacik 1466cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1476cbff00fSChristoph Hellwig } 1486cbff00fSChristoph Hellwig 1496cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1506cbff00fSChristoph Hellwig { 1516cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); 1526cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1536cbff00fSChristoph Hellwig 1546cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1556cbff00fSChristoph Hellwig return -EFAULT; 1566cbff00fSChristoph Hellwig return 0; 1576cbff00fSChristoph Hellwig } 1586cbff00fSChristoph Hellwig 15975e7cb7fSLiu Bo static int check_flags(unsigned int flags) 16075e7cb7fSLiu Bo { 16175e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 16275e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 16375e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 164e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 165e1e8fb6aSLi Zefan FS_NOCOW_FL)) 16675e7cb7fSLiu Bo return -EOPNOTSUPP; 16775e7cb7fSLiu Bo 16875e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 16975e7cb7fSLiu Bo return -EINVAL; 17075e7cb7fSLiu Bo 17175e7cb7fSLiu Bo return 0; 17275e7cb7fSLiu Bo } 17375e7cb7fSLiu Bo 1746cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1756cbff00fSChristoph Hellwig { 1766cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 1776cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1786cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1796cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1806cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1816cbff00fSChristoph Hellwig int ret; 182f062abf0SLi Zefan u64 ip_oldflags; 183f062abf0SLi Zefan unsigned int i_oldflags; 1846cbff00fSChristoph Hellwig 185b83cc969SLi Zefan if (btrfs_root_readonly(root)) 186b83cc969SLi Zefan return -EROFS; 187b83cc969SLi Zefan 1886cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1896cbff00fSChristoph Hellwig return -EFAULT; 1906cbff00fSChristoph Hellwig 19175e7cb7fSLiu Bo ret = check_flags(flags); 19275e7cb7fSLiu Bo if (ret) 19375e7cb7fSLiu Bo return ret; 1946cbff00fSChristoph Hellwig 1952e149670SSerge E. Hallyn if (!inode_owner_or_capable(inode)) 1966cbff00fSChristoph Hellwig return -EACCES; 1976cbff00fSChristoph Hellwig 198e7848683SJan Kara ret = mnt_want_write_file(file); 199e7848683SJan Kara if (ret) 200e7848683SJan Kara return ret; 201e7848683SJan Kara 2026cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 2036cbff00fSChristoph Hellwig 204f062abf0SLi Zefan ip_oldflags = ip->flags; 205f062abf0SLi Zefan i_oldflags = inode->i_flags; 206f062abf0SLi Zefan 2076cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 2086cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 2096cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 2106cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 2116cbff00fSChristoph Hellwig ret = -EPERM; 2126cbff00fSChristoph Hellwig goto out_unlock; 2136cbff00fSChristoph Hellwig } 2146cbff00fSChristoph Hellwig } 2156cbff00fSChristoph Hellwig 2166cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 2176cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 2186cbff00fSChristoph Hellwig else 2196cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2206cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2216cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2226cbff00fSChristoph Hellwig else 2236cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2246cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2256cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2266cbff00fSChristoph Hellwig else 2276cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2286cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2296cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2306cbff00fSChristoph Hellwig else 2316cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2326cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2336cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2346cbff00fSChristoph Hellwig else 2356cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2366cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2376cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2386cbff00fSChristoph Hellwig else 2396cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 240e1e8fb6aSLi Zefan if (flags & FS_NOCOW_FL) 241e1e8fb6aSLi Zefan ip->flags |= BTRFS_INODE_NODATACOW; 242e1e8fb6aSLi Zefan else 243e1e8fb6aSLi Zefan ip->flags &= ~BTRFS_INODE_NODATACOW; 2446cbff00fSChristoph Hellwig 24575e7cb7fSLiu Bo /* 24675e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 24775e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 24875e7cb7fSLiu Bo * things smaller. 24975e7cb7fSLiu Bo */ 25075e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 25175e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 25275e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 25375e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 25475e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 25575e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 256ebcb904dSLi Zefan } else { 257ebcb904dSLi Zefan ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 25875e7cb7fSLiu Bo } 2596cbff00fSChristoph Hellwig 2604da6f1a3SLi Zefan trans = btrfs_start_transaction(root, 1); 261f062abf0SLi Zefan if (IS_ERR(trans)) { 262f062abf0SLi Zefan ret = PTR_ERR(trans); 263f062abf0SLi Zefan goto out_drop; 264f062abf0SLi Zefan } 2656cbff00fSChristoph Hellwig 266306424ccSLi Zefan btrfs_update_iflags(inode); 2670c4d2d95SJosef Bacik inode_inc_iversion(inode); 268306424ccSLi Zefan inode->i_ctime = CURRENT_TIME; 2696cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 2706cbff00fSChristoph Hellwig 2716cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 272f062abf0SLi Zefan out_drop: 273f062abf0SLi Zefan if (ret) { 274f062abf0SLi Zefan ip->flags = ip_oldflags; 275f062abf0SLi Zefan inode->i_flags = i_oldflags; 276f062abf0SLi Zefan } 2776cbff00fSChristoph Hellwig 2786cbff00fSChristoph Hellwig out_unlock: 2796cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 280e7848683SJan Kara mnt_drop_write_file(file); 2812d4e6f6aSliubo return ret; 2826cbff00fSChristoph Hellwig } 2836cbff00fSChristoph Hellwig 2846cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 2856cbff00fSChristoph Hellwig { 2866cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 2876cbff00fSChristoph Hellwig 2886cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 2896cbff00fSChristoph Hellwig } 290f46b5a66SChristoph Hellwig 291f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 292f7039b1dSLi Dongyang { 293815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(fdentry(file)->d_sb); 294f7039b1dSLi Dongyang struct btrfs_device *device; 295f7039b1dSLi Dongyang struct request_queue *q; 296f7039b1dSLi Dongyang struct fstrim_range range; 297f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 298f7039b1dSLi Dongyang u64 num_devices = 0; 299815745cfSAl Viro u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); 300f7039b1dSLi Dongyang int ret; 301f7039b1dSLi Dongyang 302f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 303f7039b1dSLi Dongyang return -EPERM; 304f7039b1dSLi Dongyang 3051f78160cSXiao Guangrong rcu_read_lock(); 3061f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 3071f78160cSXiao Guangrong dev_list) { 308f7039b1dSLi Dongyang if (!device->bdev) 309f7039b1dSLi Dongyang continue; 310f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 311f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 312f7039b1dSLi Dongyang num_devices++; 313f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 314f7039b1dSLi Dongyang minlen); 315f7039b1dSLi Dongyang } 316f7039b1dSLi Dongyang } 3171f78160cSXiao Guangrong rcu_read_unlock(); 318f4c697e6SLukas Czerner 319f7039b1dSLi Dongyang if (!num_devices) 320f7039b1dSLi Dongyang return -EOPNOTSUPP; 321f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 322f7039b1dSLi Dongyang return -EFAULT; 323f4c697e6SLukas Czerner if (range.start > total_bytes) 324f4c697e6SLukas Czerner return -EINVAL; 325f7039b1dSLi Dongyang 326f4c697e6SLukas Czerner range.len = min(range.len, total_bytes - range.start); 327f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 328815745cfSAl Viro ret = btrfs_trim_fs(fs_info->tree_root, &range); 329f7039b1dSLi Dongyang if (ret < 0) 330f7039b1dSLi Dongyang return ret; 331f7039b1dSLi Dongyang 332f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 333f7039b1dSLi Dongyang return -EFAULT; 334f7039b1dSLi Dongyang 335f7039b1dSLi Dongyang return 0; 336f7039b1dSLi Dongyang } 337f7039b1dSLi Dongyang 338cb8e7090SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, 339cb8e7090SChristoph Hellwig struct dentry *dentry, 34072fd032eSSage Weil char *name, int namelen, 3416f72c7e2SArne Jansen u64 *async_transid, 3426f72c7e2SArne Jansen struct btrfs_qgroup_inherit **inherit) 343f46b5a66SChristoph Hellwig { 344f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 345f46b5a66SChristoph Hellwig struct btrfs_key key; 346f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 347f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 348f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 34976dda93cSYan, Zheng struct btrfs_root *new_root; 3502fbe8c8aSAl Viro struct dentry *parent = dentry->d_parent; 3516a912213SJosef Bacik struct inode *dir; 3528ea05e3aSAlexander Block struct timespec cur_time = CURRENT_TIME; 353f46b5a66SChristoph Hellwig int ret; 354f46b5a66SChristoph Hellwig int err; 355f46b5a66SChristoph Hellwig u64 objectid; 356f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 3573de4586cSChris Mason u64 index = 0; 3588ea05e3aSAlexander Block uuid_le new_uuid; 359f46b5a66SChristoph Hellwig 360581bb050SLi Zefan ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); 3612fbe8c8aSAl Viro if (ret) 362a22285a6SYan, Zheng return ret; 3636a912213SJosef Bacik 3646a912213SJosef Bacik dir = parent->d_inode; 3656a912213SJosef Bacik 3669ed74f2dSJosef Bacik /* 3679ed74f2dSJosef Bacik * 1 - inode item 3689ed74f2dSJosef Bacik * 2 - refs 3699ed74f2dSJosef Bacik * 1 - root item 3709ed74f2dSJosef Bacik * 2 - dir items 3719ed74f2dSJosef Bacik */ 372a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 6); 3732fbe8c8aSAl Viro if (IS_ERR(trans)) 374a22285a6SYan, Zheng return PTR_ERR(trans); 375f46b5a66SChristoph Hellwig 3766f72c7e2SArne Jansen ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, 3776f72c7e2SArne Jansen inherit ? *inherit : NULL); 3786f72c7e2SArne Jansen if (ret) 3796f72c7e2SArne Jansen goto fail; 3806f72c7e2SArne Jansen 3815d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 3825581a51aSJan Schmidt 0, objectid, NULL, 0, 0, 0); 3838e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 3848e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 3858e8a1e31SJosef Bacik goto fail; 3868e8a1e31SJosef Bacik } 387f46b5a66SChristoph Hellwig 3885d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 389f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 390f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 3915d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 392f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 393f46b5a66SChristoph Hellwig 394f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 395f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 396f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 3975d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 3985d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 3995d4f98a2SYan Zheng BTRFS_UUID_SIZE); 400f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 401f46b5a66SChristoph Hellwig 4028ea05e3aSAlexander Block memset(&root_item, 0, sizeof(root_item)); 4038ea05e3aSAlexander Block 404f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 405f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 406f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 407f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 408a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 409f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 410f46b5a66SChristoph Hellwig 41108fe4db1SLi Zefan root_item.flags = 0; 41208fe4db1SLi Zefan root_item.byte_limit = 0; 41308fe4db1SLi Zefan inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT); 41408fe4db1SLi Zefan 415f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 41684234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 417f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 418f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 41986b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 42080ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 421f46b5a66SChristoph Hellwig 4228ea05e3aSAlexander Block btrfs_set_root_generation_v2(&root_item, 4238ea05e3aSAlexander Block btrfs_root_generation(&root_item)); 4248ea05e3aSAlexander Block uuid_le_gen(&new_uuid); 4258ea05e3aSAlexander Block memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); 4268ea05e3aSAlexander Block root_item.otime.sec = cpu_to_le64(cur_time.tv_sec); 427dadd1105SDan Carpenter root_item.otime.nsec = cpu_to_le32(cur_time.tv_nsec); 4288ea05e3aSAlexander Block root_item.ctime = root_item.otime; 4298ea05e3aSAlexander Block btrfs_set_root_ctransid(&root_item, trans->transid); 4308ea05e3aSAlexander Block btrfs_set_root_otransid(&root_item, trans->transid); 431f46b5a66SChristoph Hellwig 432925baeddSChris Mason btrfs_tree_unlock(leaf); 433f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 434f46b5a66SChristoph Hellwig leaf = NULL; 435f46b5a66SChristoph Hellwig 436f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 437f46b5a66SChristoph Hellwig 438f46b5a66SChristoph Hellwig key.objectid = objectid; 4395d4f98a2SYan Zheng key.offset = 0; 440f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 441f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 442f46b5a66SChristoph Hellwig &root_item); 443f46b5a66SChristoph Hellwig if (ret) 444f46b5a66SChristoph Hellwig goto fail; 445f46b5a66SChristoph Hellwig 44676dda93cSYan, Zheng key.offset = (u64)-1; 44776dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 44879787eaaSJeff Mahoney if (IS_ERR(new_root)) { 44979787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); 45079787eaaSJeff Mahoney ret = PTR_ERR(new_root); 45179787eaaSJeff Mahoney goto fail; 45279787eaaSJeff Mahoney } 45376dda93cSYan, Zheng 45476dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 45576dda93cSYan, Zheng 456d82a6f1dSJosef Bacik ret = btrfs_create_subvol_root(trans, new_root, new_dirid); 457ce598979SMark Fasheh if (ret) { 458ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 45979787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 460ce598979SMark Fasheh goto fail; 461ce598979SMark Fasheh } 462ce598979SMark Fasheh 463f46b5a66SChristoph Hellwig /* 464f46b5a66SChristoph Hellwig * insert the directory item 465f46b5a66SChristoph Hellwig */ 4663de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 46779787eaaSJeff Mahoney if (ret) { 46879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 46979787eaaSJeff Mahoney goto fail; 47079787eaaSJeff Mahoney } 4713de4586cSChris Mason 4723de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 47316cdcec7SMiao Xie name, namelen, dir, &key, 4743de4586cSChris Mason BTRFS_FT_DIR, index); 47579787eaaSJeff Mahoney if (ret) { 47679787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 477f46b5a66SChristoph Hellwig goto fail; 47879787eaaSJeff Mahoney } 4790660b5afSChris Mason 48052c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 48152c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 48252c26179SYan Zheng BUG_ON(ret); 48352c26179SYan Zheng 4840660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 4854df27c4dSYan, Zheng objectid, root->root_key.objectid, 48633345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 48776dda93cSYan, Zheng 4880660b5afSChris Mason BUG_ON(ret); 4890660b5afSChris Mason 49076dda93cSYan, Zheng d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 491f46b5a66SChristoph Hellwig fail: 49272fd032eSSage Weil if (async_transid) { 49372fd032eSSage Weil *async_transid = trans->transid; 49472fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 49572fd032eSSage Weil } else { 49676dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 49772fd032eSSage Weil } 498f46b5a66SChristoph Hellwig if (err && !ret) 499f46b5a66SChristoph Hellwig ret = err; 500f46b5a66SChristoph Hellwig return ret; 501f46b5a66SChristoph Hellwig } 502f46b5a66SChristoph Hellwig 50372fd032eSSage Weil static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 504b83cc969SLi Zefan char *name, int namelen, u64 *async_transid, 5056f72c7e2SArne Jansen bool readonly, struct btrfs_qgroup_inherit **inherit) 506f46b5a66SChristoph Hellwig { 5072e4bfab9SYan, Zheng struct inode *inode; 508f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 509f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 5102e4bfab9SYan, Zheng int ret; 511f46b5a66SChristoph Hellwig 512f46b5a66SChristoph Hellwig if (!root->ref_cows) 513f46b5a66SChristoph Hellwig return -EINVAL; 514f46b5a66SChristoph Hellwig 515a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 516a22285a6SYan, Zheng if (!pending_snapshot) 517a22285a6SYan, Zheng return -ENOMEM; 518a22285a6SYan, Zheng 51966d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 52066d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 521a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 522a22285a6SYan, Zheng pending_snapshot->root = root; 523b83cc969SLi Zefan pending_snapshot->readonly = readonly; 5246f72c7e2SArne Jansen if (inherit) { 5256f72c7e2SArne Jansen pending_snapshot->inherit = *inherit; 5266f72c7e2SArne Jansen *inherit = NULL; /* take responsibility to free it */ 5276f72c7e2SArne Jansen } 528a22285a6SYan, Zheng 52948c03c4bSMiao Xie trans = btrfs_start_transaction(root->fs_info->extent_root, 6); 530a22285a6SYan, Zheng if (IS_ERR(trans)) { 531a22285a6SYan, Zheng ret = PTR_ERR(trans); 532a22285a6SYan, Zheng goto fail; 533a22285a6SYan, Zheng } 534a22285a6SYan, Zheng 535a22285a6SYan, Zheng ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); 536a22285a6SYan, Zheng BUG_ON(ret); 537a22285a6SYan, Zheng 5388351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 539a22285a6SYan, Zheng list_add(&pending_snapshot->list, 540a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 5418351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 54272fd032eSSage Weil if (async_transid) { 54372fd032eSSage Weil *async_transid = trans->transid; 54472fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 54572fd032eSSage Weil root->fs_info->extent_root, 1); 54672fd032eSSage Weil } else { 54772fd032eSSage Weil ret = btrfs_commit_transaction(trans, 54872fd032eSSage Weil root->fs_info->extent_root); 54972fd032eSSage Weil } 550a22285a6SYan, Zheng BUG_ON(ret); 551a22285a6SYan, Zheng 552a22285a6SYan, Zheng ret = pending_snapshot->error; 553f46b5a66SChristoph Hellwig if (ret) 5542e4bfab9SYan, Zheng goto fail; 555f46b5a66SChristoph Hellwig 55666b4ffd1SJosef Bacik ret = btrfs_orphan_cleanup(pending_snapshot->snap); 55766b4ffd1SJosef Bacik if (ret) 55866b4ffd1SJosef Bacik goto fail; 559f46b5a66SChristoph Hellwig 5602fbe8c8aSAl Viro inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 5612e4bfab9SYan, Zheng if (IS_ERR(inode)) { 5622e4bfab9SYan, Zheng ret = PTR_ERR(inode); 5632e4bfab9SYan, Zheng goto fail; 5642e4bfab9SYan, Zheng } 5652e4bfab9SYan, Zheng BUG_ON(!inode); 5662e4bfab9SYan, Zheng d_instantiate(dentry, inode); 5672e4bfab9SYan, Zheng ret = 0; 5682e4bfab9SYan, Zheng fail: 569a22285a6SYan, Zheng kfree(pending_snapshot); 570f46b5a66SChristoph Hellwig return ret; 571f46b5a66SChristoph Hellwig } 572f46b5a66SChristoph Hellwig 5734260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 5744260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 5754260f7c7SSage Weil * minimal. 5764260f7c7SSage Weil */ 5774260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 5784260f7c7SSage Weil { 5794260f7c7SSage Weil uid_t fsuid = current_fsuid(); 5804260f7c7SSage Weil 5814260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 5824260f7c7SSage Weil return 0; 5834260f7c7SSage Weil if (inode->i_uid == fsuid) 5844260f7c7SSage Weil return 0; 5854260f7c7SSage Weil if (dir->i_uid == fsuid) 5864260f7c7SSage Weil return 0; 5874260f7c7SSage Weil return !capable(CAP_FOWNER); 5884260f7c7SSage Weil } 5894260f7c7SSage Weil 5904260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 5914260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 5924260f7c7SSage Weil * whether the type of victim is right. 5934260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 5944260f7c7SSage Weil * 2. We should have write and exec permissions on dir 5954260f7c7SSage Weil * 3. We can't remove anything from append-only dir 5964260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 5974260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 5984260f7c7SSage Weil * a. be owner of dir, or 5994260f7c7SSage Weil * b. be owner of victim, or 6004260f7c7SSage Weil * c. have CAP_FOWNER capability 6014260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 6024260f7c7SSage Weil * links pointing to it. 6034260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 6044260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 6054260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 6064260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 6074260f7c7SSage Weil * nfs_async_unlink(). 6084260f7c7SSage Weil */ 6094260f7c7SSage Weil 6104260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) 6114260f7c7SSage Weil { 6124260f7c7SSage Weil int error; 6134260f7c7SSage Weil 6144260f7c7SSage Weil if (!victim->d_inode) 6154260f7c7SSage Weil return -ENOENT; 6164260f7c7SSage Weil 6174260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 6184260f7c7SSage Weil audit_inode_child(victim, dir); 6194260f7c7SSage Weil 6204260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 6214260f7c7SSage Weil if (error) 6224260f7c7SSage Weil return error; 6234260f7c7SSage Weil if (IS_APPEND(dir)) 6244260f7c7SSage Weil return -EPERM; 6254260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 6264260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 6274260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 6284260f7c7SSage Weil return -EPERM; 6294260f7c7SSage Weil if (isdir) { 6304260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 6314260f7c7SSage Weil return -ENOTDIR; 6324260f7c7SSage Weil if (IS_ROOT(victim)) 6334260f7c7SSage Weil return -EBUSY; 6344260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 6354260f7c7SSage Weil return -EISDIR; 6364260f7c7SSage Weil if (IS_DEADDIR(dir)) 6374260f7c7SSage Weil return -ENOENT; 6384260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 6394260f7c7SSage Weil return -EBUSY; 6404260f7c7SSage Weil return 0; 6414260f7c7SSage Weil } 6424260f7c7SSage Weil 643cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 644cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 645cb8e7090SChristoph Hellwig { 646cb8e7090SChristoph Hellwig if (child->d_inode) 647cb8e7090SChristoph Hellwig return -EEXIST; 648cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 649cb8e7090SChristoph Hellwig return -ENOENT; 650cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 651cb8e7090SChristoph Hellwig } 652cb8e7090SChristoph Hellwig 653cb8e7090SChristoph Hellwig /* 654cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 655cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 656cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 657cb8e7090SChristoph Hellwig */ 65876dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 65976dda93cSYan, Zheng char *name, int namelen, 66072fd032eSSage Weil struct btrfs_root *snap_src, 6616f72c7e2SArne Jansen u64 *async_transid, bool readonly, 6626f72c7e2SArne Jansen struct btrfs_qgroup_inherit **inherit) 663cb8e7090SChristoph Hellwig { 66476dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 665cb8e7090SChristoph Hellwig struct dentry *dentry; 666cb8e7090SChristoph Hellwig int error; 667cb8e7090SChristoph Hellwig 66876dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 669cb8e7090SChristoph Hellwig 670cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 671cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 672cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 673cb8e7090SChristoph Hellwig goto out_unlock; 674cb8e7090SChristoph Hellwig 675cb8e7090SChristoph Hellwig error = -EEXIST; 676cb8e7090SChristoph Hellwig if (dentry->d_inode) 677cb8e7090SChristoph Hellwig goto out_dput; 678cb8e7090SChristoph Hellwig 67976dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 680cb8e7090SChristoph Hellwig if (error) 681a874a63eSLiu Bo goto out_dput; 682cb8e7090SChristoph Hellwig 68376dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 68476dda93cSYan, Zheng 68576dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 68676dda93cSYan, Zheng goto out_up_read; 68776dda93cSYan, Zheng 6883de4586cSChris Mason if (snap_src) { 6896f72c7e2SArne Jansen error = create_snapshot(snap_src, dentry, name, namelen, 6906f72c7e2SArne Jansen async_transid, readonly, inherit); 6913de4586cSChris Mason } else { 69276dda93cSYan, Zheng error = create_subvol(BTRFS_I(dir)->root, dentry, 6936f72c7e2SArne Jansen name, namelen, async_transid, inherit); 6943de4586cSChris Mason } 69576dda93cSYan, Zheng if (!error) 69676dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 69776dda93cSYan, Zheng out_up_read: 69876dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 699cb8e7090SChristoph Hellwig out_dput: 700cb8e7090SChristoph Hellwig dput(dentry); 701cb8e7090SChristoph Hellwig out_unlock: 70276dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 703cb8e7090SChristoph Hellwig return error; 704cb8e7090SChristoph Hellwig } 705cb8e7090SChristoph Hellwig 7064cb5300bSChris Mason /* 7074cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 7084cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 7094cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 7104cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 7114cb5300bSChris Mason * part of the file 7124cb5300bSChris Mason */ 7134cb5300bSChris Mason static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) 7144cb5300bSChris Mason { 7154cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 7164cb5300bSChris Mason struct extent_map *em = NULL; 7174cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 7184cb5300bSChris Mason u64 end; 7194cb5300bSChris Mason 7204cb5300bSChris Mason read_lock(&em_tree->lock); 7214cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 7224cb5300bSChris Mason read_unlock(&em_tree->lock); 7234cb5300bSChris Mason 7244cb5300bSChris Mason if (em) { 7254cb5300bSChris Mason end = extent_map_end(em); 7264cb5300bSChris Mason free_extent_map(em); 7274cb5300bSChris Mason if (end - offset > thresh) 7284cb5300bSChris Mason return 0; 7294cb5300bSChris Mason } 7304cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 7314cb5300bSChris Mason thresh /= 2; 7324cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 7334cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 7344cb5300bSChris Mason if (end >= thresh) 7354cb5300bSChris Mason return 0; 7364cb5300bSChris Mason return 1; 7374cb5300bSChris Mason } 7384cb5300bSChris Mason 7394cb5300bSChris Mason /* 7404cb5300bSChris Mason * helper function to walk through a file and find extents 7414cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 7424cb5300bSChris Mason * 7434cb5300bSChris Mason * This is used by the defragging code to find new and small 7444cb5300bSChris Mason * extents 7454cb5300bSChris Mason */ 7464cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 7474cb5300bSChris Mason struct inode *inode, u64 newer_than, 7484cb5300bSChris Mason u64 *off, int thresh) 7494cb5300bSChris Mason { 7504cb5300bSChris Mason struct btrfs_path *path; 7514cb5300bSChris Mason struct btrfs_key min_key; 7524cb5300bSChris Mason struct btrfs_key max_key; 7534cb5300bSChris Mason struct extent_buffer *leaf; 7544cb5300bSChris Mason struct btrfs_file_extent_item *extent; 7554cb5300bSChris Mason int type; 7564cb5300bSChris Mason int ret; 757a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 7584cb5300bSChris Mason 7594cb5300bSChris Mason path = btrfs_alloc_path(); 7604cb5300bSChris Mason if (!path) 7614cb5300bSChris Mason return -ENOMEM; 7624cb5300bSChris Mason 763a4689d2bSDavid Sterba min_key.objectid = ino; 7644cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 7654cb5300bSChris Mason min_key.offset = *off; 7664cb5300bSChris Mason 767a4689d2bSDavid Sterba max_key.objectid = ino; 7684cb5300bSChris Mason max_key.type = (u8)-1; 7694cb5300bSChris Mason max_key.offset = (u64)-1; 7704cb5300bSChris Mason 7714cb5300bSChris Mason path->keep_locks = 1; 7724cb5300bSChris Mason 7734cb5300bSChris Mason while(1) { 7744cb5300bSChris Mason ret = btrfs_search_forward(root, &min_key, &max_key, 7754cb5300bSChris Mason path, 0, newer_than); 7764cb5300bSChris Mason if (ret != 0) 7774cb5300bSChris Mason goto none; 778a4689d2bSDavid Sterba if (min_key.objectid != ino) 7794cb5300bSChris Mason goto none; 7804cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 7814cb5300bSChris Mason goto none; 7824cb5300bSChris Mason 7834cb5300bSChris Mason leaf = path->nodes[0]; 7844cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 7854cb5300bSChris Mason struct btrfs_file_extent_item); 7864cb5300bSChris Mason 7874cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 7884cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 7894cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 7904cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 7914cb5300bSChris Mason *off = min_key.offset; 7924cb5300bSChris Mason btrfs_free_path(path); 7934cb5300bSChris Mason return 0; 7944cb5300bSChris Mason } 7954cb5300bSChris Mason 7964cb5300bSChris Mason if (min_key.offset == (u64)-1) 7974cb5300bSChris Mason goto none; 7984cb5300bSChris Mason 7994cb5300bSChris Mason min_key.offset++; 8004cb5300bSChris Mason btrfs_release_path(path); 8014cb5300bSChris Mason } 8024cb5300bSChris Mason none: 8034cb5300bSChris Mason btrfs_free_path(path); 8044cb5300bSChris Mason return -ENOENT; 8054cb5300bSChris Mason } 8064cb5300bSChris Mason 8076c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 80817ce6ef8SLiu Bo { 80917ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 810940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 8116c282eb4SLi Zefan struct extent_map *em; 8126c282eb4SLi Zefan u64 len = PAGE_CACHE_SIZE; 813940100a4SChris Mason 814940100a4SChris Mason /* 815940100a4SChris Mason * hopefully we have this extent in the tree already, try without 816940100a4SChris Mason * the full extent lock 817940100a4SChris Mason */ 818940100a4SChris Mason read_lock(&em_tree->lock); 819940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 820940100a4SChris Mason read_unlock(&em_tree->lock); 821940100a4SChris Mason 822940100a4SChris Mason if (!em) { 823940100a4SChris Mason /* get the big lock and read metadata off disk */ 824d0082371SJeff Mahoney lock_extent(io_tree, start, start + len - 1); 825940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 826d0082371SJeff Mahoney unlock_extent(io_tree, start, start + len - 1); 827940100a4SChris Mason 8286cf8bfbfSDan Carpenter if (IS_ERR(em)) 8296c282eb4SLi Zefan return NULL; 830940100a4SChris Mason } 831940100a4SChris Mason 8326c282eb4SLi Zefan return em; 8336c282eb4SLi Zefan } 8346c282eb4SLi Zefan 8356c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 8366c282eb4SLi Zefan { 8376c282eb4SLi Zefan struct extent_map *next; 8386c282eb4SLi Zefan bool ret = true; 8396c282eb4SLi Zefan 8406c282eb4SLi Zefan /* this is the last extent */ 8416c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 8426c282eb4SLi Zefan return false; 8436c282eb4SLi Zefan 8446c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 8456c282eb4SLi Zefan if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 8466c282eb4SLi Zefan ret = false; 8476c282eb4SLi Zefan 8486c282eb4SLi Zefan free_extent_map(next); 8496c282eb4SLi Zefan return ret; 8506c282eb4SLi Zefan } 8516c282eb4SLi Zefan 8526c282eb4SLi Zefan static int should_defrag_range(struct inode *inode, u64 start, int thresh, 853a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 854a43a2111SAndrew Mahone int compress) 8556c282eb4SLi Zefan { 8566c282eb4SLi Zefan struct extent_map *em; 8576c282eb4SLi Zefan int ret = 1; 8586c282eb4SLi Zefan bool next_mergeable = true; 8596c282eb4SLi Zefan 8606c282eb4SLi Zefan /* 8616c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 8626c282eb4SLi Zefan * defragging it 8636c282eb4SLi Zefan */ 8646c282eb4SLi Zefan if (start < *defrag_end) 8656c282eb4SLi Zefan return 1; 8666c282eb4SLi Zefan 8676c282eb4SLi Zefan *skip = 0; 8686c282eb4SLi Zefan 8696c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 8706c282eb4SLi Zefan if (!em) 8716c282eb4SLi Zefan return 0; 8726c282eb4SLi Zefan 873940100a4SChris Mason /* this will cover holes, and inline extents */ 87417ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 875940100a4SChris Mason ret = 0; 87617ce6ef8SLiu Bo goto out; 87717ce6ef8SLiu Bo } 87817ce6ef8SLiu Bo 8796c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 880940100a4SChris Mason 881940100a4SChris Mason /* 8826c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 8836c282eb4SLi Zefan * real extent, don't bother defragging it 884940100a4SChris Mason */ 885a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 8866c282eb4SLi Zefan (em->len >= thresh || !next_mergeable)) 887940100a4SChris Mason ret = 0; 88817ce6ef8SLiu Bo out: 889940100a4SChris Mason /* 890940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 891940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 892940100a4SChris Mason * so that the next tiny extent will force a defrag. 893940100a4SChris Mason * 894940100a4SChris Mason * The end result of this is that tiny extents before a single big 895940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 896940100a4SChris Mason */ 897940100a4SChris Mason if (ret) { 898940100a4SChris Mason *defrag_end = extent_map_end(em); 899940100a4SChris Mason } else { 900940100a4SChris Mason *last_len = 0; 901940100a4SChris Mason *skip = extent_map_end(em); 902940100a4SChris Mason *defrag_end = 0; 903940100a4SChris Mason } 904940100a4SChris Mason 905940100a4SChris Mason free_extent_map(em); 906940100a4SChris Mason return ret; 907940100a4SChris Mason } 908940100a4SChris Mason 9094cb5300bSChris Mason /* 9104cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 9114cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 9124cb5300bSChris Mason * to COW and defrag. 9134cb5300bSChris Mason * 9144cb5300bSChris Mason * It also makes sure the delalloc code has enough 9154cb5300bSChris Mason * dirty data to avoid making new small extents as part 9164cb5300bSChris Mason * of the defrag 9174cb5300bSChris Mason * 9184cb5300bSChris Mason * It's a good idea to start RA on this range 9194cb5300bSChris Mason * before calling this. 9204cb5300bSChris Mason */ 9214cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 9224cb5300bSChris Mason struct page **pages, 9234cb5300bSChris Mason unsigned long start_index, 9244cb5300bSChris Mason int num_pages) 925f46b5a66SChristoph Hellwig { 9264cb5300bSChris Mason unsigned long file_end; 9274cb5300bSChris Mason u64 isize = i_size_read(inode); 928f46b5a66SChristoph Hellwig u64 page_start; 929f46b5a66SChristoph Hellwig u64 page_end; 9301f12bd06SLiu Bo u64 page_cnt; 9314cb5300bSChris Mason int ret; 9324cb5300bSChris Mason int i; 9334cb5300bSChris Mason int i_done; 9344cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 9354cb5300bSChris Mason struct extent_state *cached_state = NULL; 936600a45e1SMiao Xie struct extent_io_tree *tree; 9373b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 9384cb5300bSChris Mason 9394cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 9401f12bd06SLiu Bo if (!isize || start_index > file_end) 9411f12bd06SLiu Bo return 0; 9421f12bd06SLiu Bo 9431f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 9444cb5300bSChris Mason 9454cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 9461f12bd06SLiu Bo page_cnt << PAGE_CACHE_SHIFT); 9474cb5300bSChris Mason if (ret) 9484cb5300bSChris Mason return ret; 9494cb5300bSChris Mason i_done = 0; 950600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 9514cb5300bSChris Mason 9524cb5300bSChris Mason /* step one, lock all the pages */ 9531f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 9544cb5300bSChris Mason struct page *page; 955600a45e1SMiao Xie again: 956a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 9573b16a4e3SJosef Bacik start_index + i, mask); 9584cb5300bSChris Mason if (!page) 9594cb5300bSChris Mason break; 9604cb5300bSChris Mason 961600a45e1SMiao Xie page_start = page_offset(page); 962600a45e1SMiao Xie page_end = page_start + PAGE_CACHE_SIZE - 1; 963600a45e1SMiao Xie while (1) { 964d0082371SJeff Mahoney lock_extent(tree, page_start, page_end); 965600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 966600a45e1SMiao Xie page_start); 967d0082371SJeff Mahoney unlock_extent(tree, page_start, page_end); 968600a45e1SMiao Xie if (!ordered) 969600a45e1SMiao Xie break; 970600a45e1SMiao Xie 971600a45e1SMiao Xie unlock_page(page); 972600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 973600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 974600a45e1SMiao Xie lock_page(page); 9751f12bd06SLiu Bo /* 9761f12bd06SLiu Bo * we unlocked the page above, so we need check if 9771f12bd06SLiu Bo * it was released or not. 9781f12bd06SLiu Bo */ 9791f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 9801f12bd06SLiu Bo unlock_page(page); 9811f12bd06SLiu Bo page_cache_release(page); 9821f12bd06SLiu Bo goto again; 9831f12bd06SLiu Bo } 984600a45e1SMiao Xie } 985600a45e1SMiao Xie 9864cb5300bSChris Mason if (!PageUptodate(page)) { 9874cb5300bSChris Mason btrfs_readpage(NULL, page); 9884cb5300bSChris Mason lock_page(page); 9894cb5300bSChris Mason if (!PageUptodate(page)) { 9904cb5300bSChris Mason unlock_page(page); 9914cb5300bSChris Mason page_cache_release(page); 9924cb5300bSChris Mason ret = -EIO; 9934cb5300bSChris Mason break; 9944cb5300bSChris Mason } 9954cb5300bSChris Mason } 996600a45e1SMiao Xie 997600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 998600a45e1SMiao Xie unlock_page(page); 999600a45e1SMiao Xie page_cache_release(page); 1000600a45e1SMiao Xie goto again; 1001600a45e1SMiao Xie } 1002600a45e1SMiao Xie 10034cb5300bSChris Mason pages[i] = page; 10044cb5300bSChris Mason i_done++; 10054cb5300bSChris Mason } 10064cb5300bSChris Mason if (!i_done || ret) 10074cb5300bSChris Mason goto out; 10084cb5300bSChris Mason 10094cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 10104cb5300bSChris Mason goto out; 10114cb5300bSChris Mason 10124cb5300bSChris Mason /* 10134cb5300bSChris Mason * so now we have a nice long stream of locked 10144cb5300bSChris Mason * and up to date pages, lets wait on them 10154cb5300bSChris Mason */ 10164cb5300bSChris Mason for (i = 0; i < i_done; i++) 10174cb5300bSChris Mason wait_on_page_writeback(pages[i]); 10184cb5300bSChris Mason 10194cb5300bSChris Mason page_start = page_offset(pages[0]); 10204cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 10214cb5300bSChris Mason 10224cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1023d0082371SJeff Mahoney page_start, page_end - 1, 0, &cached_state); 10244cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 10254cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 10269e8a4a8bSLiu Bo EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, 10279e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 10284cb5300bSChris Mason 10291f12bd06SLiu Bo if (i_done != page_cnt) { 10309e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 10319e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 10329e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 10334cb5300bSChris Mason btrfs_delalloc_release_space(inode, 10341f12bd06SLiu Bo (page_cnt - i_done) << PAGE_CACHE_SHIFT); 10354cb5300bSChris Mason } 10364cb5300bSChris Mason 10374cb5300bSChris Mason 10389e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 10399e8a4a8bSLiu Bo &cached_state, GFP_NOFS); 10404cb5300bSChris Mason 10414cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 10424cb5300bSChris Mason page_start, page_end - 1, &cached_state, 10434cb5300bSChris Mason GFP_NOFS); 10444cb5300bSChris Mason 10454cb5300bSChris Mason for (i = 0; i < i_done; i++) { 10464cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 10474cb5300bSChris Mason ClearPageChecked(pages[i]); 10484cb5300bSChris Mason set_page_extent_mapped(pages[i]); 10494cb5300bSChris Mason set_page_dirty(pages[i]); 10504cb5300bSChris Mason unlock_page(pages[i]); 10514cb5300bSChris Mason page_cache_release(pages[i]); 10524cb5300bSChris Mason } 10534cb5300bSChris Mason return i_done; 10544cb5300bSChris Mason out: 10554cb5300bSChris Mason for (i = 0; i < i_done; i++) { 10564cb5300bSChris Mason unlock_page(pages[i]); 10574cb5300bSChris Mason page_cache_release(pages[i]); 10584cb5300bSChris Mason } 10591f12bd06SLiu Bo btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); 10604cb5300bSChris Mason return ret; 10614cb5300bSChris Mason 10624cb5300bSChris Mason } 10634cb5300bSChris Mason 10644cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 10654cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 10664cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 10674cb5300bSChris Mason { 10684cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 10694cb5300bSChris Mason struct file_ra_state *ra = NULL; 10704cb5300bSChris Mason unsigned long last_index; 1071151a31b2SLi Zefan u64 isize = i_size_read(inode); 1072940100a4SChris Mason u64 last_len = 0; 1073940100a4SChris Mason u64 skip = 0; 1074940100a4SChris Mason u64 defrag_end = 0; 10754cb5300bSChris Mason u64 newer_off = range->start; 1076f46b5a66SChristoph Hellwig unsigned long i; 1077008873eaSLi Zefan unsigned long ra_index = 0; 1078f46b5a66SChristoph Hellwig int ret; 10794cb5300bSChris Mason int defrag_count = 0; 10801a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 10814cb5300bSChris Mason int extent_thresh = range->extent_thresh; 1082008873eaSLi Zefan int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; 1083008873eaSLi Zefan int cluster = max_cluster; 10844cb5300bSChris Mason u64 new_align = ~((u64)128 * 1024 - 1); 10854cb5300bSChris Mason struct page **pages = NULL; 10864cb5300bSChris Mason 10874cb5300bSChris Mason if (extent_thresh == 0) 10884cb5300bSChris Mason extent_thresh = 256 * 1024; 10891a419d85SLi Zefan 10901a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 10911a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 10921a419d85SLi Zefan return -EINVAL; 10931a419d85SLi Zefan if (range->compress_type) 10941a419d85SLi Zefan compress_type = range->compress_type; 10951a419d85SLi Zefan } 1096f46b5a66SChristoph Hellwig 1097151a31b2SLi Zefan if (isize == 0) 1098940100a4SChris Mason return 0; 1099f46b5a66SChristoph Hellwig 11004cb5300bSChris Mason /* 11014cb5300bSChris Mason * if we were not given a file, allocate a readahead 11024cb5300bSChris Mason * context 11034cb5300bSChris Mason */ 11044cb5300bSChris Mason if (!file) { 11054cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 11064cb5300bSChris Mason if (!ra) 11074cb5300bSChris Mason return -ENOMEM; 11084cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 11094cb5300bSChris Mason } else { 11104cb5300bSChris Mason ra = &file->f_ra; 11114cb5300bSChris Mason } 11124cb5300bSChris Mason 1113008873eaSLi Zefan pages = kmalloc(sizeof(struct page *) * max_cluster, 11144cb5300bSChris Mason GFP_NOFS); 11154cb5300bSChris Mason if (!pages) { 11164cb5300bSChris Mason ret = -ENOMEM; 11174cb5300bSChris Mason goto out_ra; 11184cb5300bSChris Mason } 11194cb5300bSChris Mason 11204cb5300bSChris Mason /* find the last page to defrag */ 11211e701a32SChris Mason if (range->start + range->len > range->start) { 1122151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 11231e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 11241e701a32SChris Mason } else { 1125151a31b2SLi Zefan last_index = (isize - 1) >> PAGE_CACHE_SHIFT; 11261e701a32SChris Mason } 11271e701a32SChris Mason 11284cb5300bSChris Mason if (newer_than) { 11294cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 11304cb5300bSChris Mason &newer_off, 64 * 1024); 11314cb5300bSChris Mason if (!ret) { 11324cb5300bSChris Mason range->start = newer_off; 11334cb5300bSChris Mason /* 11344cb5300bSChris Mason * we always align our defrag to help keep 11354cb5300bSChris Mason * the extents in the file evenly spaced 11364cb5300bSChris Mason */ 11374cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 11384cb5300bSChris Mason } else 11394cb5300bSChris Mason goto out_ra; 11404cb5300bSChris Mason } else { 11411e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 11424cb5300bSChris Mason } 11434cb5300bSChris Mason if (!max_to_defrag) 11447ec31b54SLiu Bo max_to_defrag = last_index + 1; 11454cb5300bSChris Mason 11462a0f7f57SLi Zefan /* 11472a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 11482a0f7f57SLi Zefan * written sequentially. 11492a0f7f57SLi Zefan */ 11502a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 11512a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 11522a0f7f57SLi Zefan 1153f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 1154f7f43cc8SChris Mason (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> 1155f7f43cc8SChris Mason PAGE_CACHE_SHIFT)) { 11564cb5300bSChris Mason /* 11574cb5300bSChris Mason * make sure we stop running if someone unmounts 11584cb5300bSChris Mason * the FS 11594cb5300bSChris Mason */ 11604cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 11614cb5300bSChris Mason break; 11624cb5300bSChris Mason 116366c26892SLiu Bo if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 11646c282eb4SLi Zefan extent_thresh, &last_len, &skip, 1165a43a2111SAndrew Mahone &defrag_end, range->flags & 1166a43a2111SAndrew Mahone BTRFS_DEFRAG_RANGE_COMPRESS)) { 1167940100a4SChris Mason unsigned long next; 1168940100a4SChris Mason /* 1169940100a4SChris Mason * the should_defrag function tells us how much to skip 1170940100a4SChris Mason * bump our counter by the suggested amount 1171940100a4SChris Mason */ 1172940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 1173940100a4SChris Mason i = max(i + 1, next); 1174940100a4SChris Mason continue; 1175940100a4SChris Mason } 1176008873eaSLi Zefan 1177008873eaSLi Zefan if (!newer_than) { 1178008873eaSLi Zefan cluster = (PAGE_CACHE_ALIGN(defrag_end) >> 1179008873eaSLi Zefan PAGE_CACHE_SHIFT) - i; 1180008873eaSLi Zefan cluster = min(cluster, max_cluster); 1181008873eaSLi Zefan } else { 1182008873eaSLi Zefan cluster = max_cluster; 1183008873eaSLi Zefan } 1184008873eaSLi Zefan 11851e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 11861a419d85SLi Zefan BTRFS_I(inode)->force_compress = compress_type; 1187940100a4SChris Mason 1188008873eaSLi Zefan if (i + cluster > ra_index) { 1189008873eaSLi Zefan ra_index = max(i, ra_index); 1190008873eaSLi Zefan btrfs_force_ra(inode->i_mapping, ra, file, ra_index, 1191008873eaSLi Zefan cluster); 1192008873eaSLi Zefan ra_index += max_cluster; 1193008873eaSLi Zefan } 11944cb5300bSChris Mason 1195ecb8bea8SLiu Bo mutex_lock(&inode->i_mutex); 1196008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1197ecb8bea8SLiu Bo if (ret < 0) { 1198ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 11994cb5300bSChris Mason goto out_ra; 1200ecb8bea8SLiu Bo } 12014cb5300bSChris Mason 12024cb5300bSChris Mason defrag_count += ret; 12034cb5300bSChris Mason balance_dirty_pages_ratelimited_nr(inode->i_mapping, ret); 1204ecb8bea8SLiu Bo mutex_unlock(&inode->i_mutex); 12054cb5300bSChris Mason 12064cb5300bSChris Mason if (newer_than) { 12074cb5300bSChris Mason if (newer_off == (u64)-1) 12084cb5300bSChris Mason break; 12094cb5300bSChris Mason 1210e1f041e1SLiu Bo if (ret > 0) 1211e1f041e1SLiu Bo i += ret; 1212e1f041e1SLiu Bo 12134cb5300bSChris Mason newer_off = max(newer_off + 1, 12144cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 12154cb5300bSChris Mason 12164cb5300bSChris Mason ret = find_new_extents(root, inode, 12174cb5300bSChris Mason newer_than, &newer_off, 12184cb5300bSChris Mason 64 * 1024); 12194cb5300bSChris Mason if (!ret) { 12204cb5300bSChris Mason range->start = newer_off; 12214cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 12224cb5300bSChris Mason } else { 12234cb5300bSChris Mason break; 1224940100a4SChris Mason } 12254cb5300bSChris Mason } else { 1226008873eaSLi Zefan if (ret > 0) { 1227cbcc8326SLi Zefan i += ret; 1228008873eaSLi Zefan last_len += ret << PAGE_CACHE_SHIFT; 1229008873eaSLi Zefan } else { 1230940100a4SChris Mason i++; 1231008873eaSLi Zefan last_len = 0; 1232008873eaSLi Zefan } 1233f46b5a66SChristoph Hellwig } 12344cb5300bSChris Mason } 1235f46b5a66SChristoph Hellwig 12361e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 12371e701a32SChris Mason filemap_flush(inode->i_mapping); 12381e701a32SChris Mason 12391e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 12401e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 12411e701a32SChris Mason * we have to make sure the IO is actually started and that 12421e701a32SChris Mason * ordered extents get created before we return 12431e701a32SChris Mason */ 12441e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 12451e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 12461e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 12471e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 12481e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 12491e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 12501e701a32SChris Mason } 12511e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 12521e701a32SChris Mason 12531e701a32SChris Mason mutex_lock(&inode->i_mutex); 1254261507a0SLi Zefan BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 12551e701a32SChris Mason mutex_unlock(&inode->i_mutex); 12561e701a32SChris Mason } 12571e701a32SChris Mason 12581a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 12592b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); 12601a419d85SLi Zefan } 12611a419d85SLi Zefan 126260ccf82fSDiego Calleja ret = defrag_count; 1263940100a4SChris Mason 12644cb5300bSChris Mason out_ra: 12654cb5300bSChris Mason if (!file) 12664cb5300bSChris Mason kfree(ra); 12674cb5300bSChris Mason kfree(pages); 1268940100a4SChris Mason return ret; 1269f46b5a66SChristoph Hellwig } 1270f46b5a66SChristoph Hellwig 127176dda93cSYan, Zheng static noinline int btrfs_ioctl_resize(struct btrfs_root *root, 127276dda93cSYan, Zheng void __user *arg) 1273f46b5a66SChristoph Hellwig { 1274f46b5a66SChristoph Hellwig u64 new_size; 1275f46b5a66SChristoph Hellwig u64 old_size; 1276f46b5a66SChristoph Hellwig u64 devid = 1; 1277f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1278f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1279f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1280f46b5a66SChristoph Hellwig char *sizestr; 1281f46b5a66SChristoph Hellwig char *devstr = NULL; 1282f46b5a66SChristoph Hellwig int ret = 0; 1283f46b5a66SChristoph Hellwig int mod = 0; 1284f46b5a66SChristoph Hellwig 1285c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1286c146afadSYan Zheng return -EROFS; 1287c146afadSYan Zheng 1288e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1289e441d54dSChris Mason return -EPERM; 1290e441d54dSChris Mason 1291c9e9f97bSIlya Dryomov mutex_lock(&root->fs_info->volume_mutex); 1292c9e9f97bSIlya Dryomov if (root->fs_info->balance_ctl) { 1293c9e9f97bSIlya Dryomov printk(KERN_INFO "btrfs: balance in progress\n"); 1294c9e9f97bSIlya Dryomov ret = -EINVAL; 1295c9e9f97bSIlya Dryomov goto out; 1296c9e9f97bSIlya Dryomov } 1297c9e9f97bSIlya Dryomov 1298dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1299c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1300c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1301c9e9f97bSIlya Dryomov goto out; 1302c9e9f97bSIlya Dryomov } 13035516e595SMark Fasheh 13045516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1305f46b5a66SChristoph Hellwig 1306f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1307f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1308f46b5a66SChristoph Hellwig if (devstr) { 1309f46b5a66SChristoph Hellwig char *end; 1310f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1311f46b5a66SChristoph Hellwig *devstr = '\0'; 1312f46b5a66SChristoph Hellwig devstr = vol_args->name; 1313f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 13145bb14682SArnd Hannemann printk(KERN_INFO "btrfs: resizing devid %llu\n", 131521380931SJoel Becker (unsigned long long)devid); 1316f46b5a66SChristoph Hellwig } 13172b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 1318f46b5a66SChristoph Hellwig if (!device) { 13195bb14682SArnd Hannemann printk(KERN_INFO "btrfs: resizer unable to find device %llu\n", 132021380931SJoel Becker (unsigned long long)devid); 1321f46b5a66SChristoph Hellwig ret = -EINVAL; 1322c9e9f97bSIlya Dryomov goto out_free; 1323f46b5a66SChristoph Hellwig } 13244e42ae1bSLiu Bo if (device->fs_devices && device->fs_devices->seeding) { 13254e42ae1bSLiu Bo printk(KERN_INFO "btrfs: resizer unable to apply on " 1326a8c4a33bSChris Mason "seeding device %llu\n", 1327a8c4a33bSChris Mason (unsigned long long)devid); 13284e42ae1bSLiu Bo ret = -EINVAL; 13294e42ae1bSLiu Bo goto out_free; 13304e42ae1bSLiu Bo } 13314e42ae1bSLiu Bo 1332f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1333f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1334f46b5a66SChristoph Hellwig else { 1335f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1336f46b5a66SChristoph Hellwig mod = -1; 1337f46b5a66SChristoph Hellwig sizestr++; 1338f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1339f46b5a66SChristoph Hellwig mod = 1; 1340f46b5a66SChristoph Hellwig sizestr++; 1341f46b5a66SChristoph Hellwig } 134291748467SAkinobu Mita new_size = memparse(sizestr, NULL); 1343f46b5a66SChristoph Hellwig if (new_size == 0) { 1344f46b5a66SChristoph Hellwig ret = -EINVAL; 1345c9e9f97bSIlya Dryomov goto out_free; 1346f46b5a66SChristoph Hellwig } 1347f46b5a66SChristoph Hellwig } 1348f46b5a66SChristoph Hellwig 1349f46b5a66SChristoph Hellwig old_size = device->total_bytes; 1350f46b5a66SChristoph Hellwig 1351f46b5a66SChristoph Hellwig if (mod < 0) { 1352f46b5a66SChristoph Hellwig if (new_size > old_size) { 1353f46b5a66SChristoph Hellwig ret = -EINVAL; 1354c9e9f97bSIlya Dryomov goto out_free; 1355f46b5a66SChristoph Hellwig } 1356f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1357f46b5a66SChristoph Hellwig } else if (mod > 0) { 1358f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1359f46b5a66SChristoph Hellwig } 1360f46b5a66SChristoph Hellwig 1361f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 1362f46b5a66SChristoph Hellwig ret = -EINVAL; 1363c9e9f97bSIlya Dryomov goto out_free; 1364f46b5a66SChristoph Hellwig } 1365f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1366f46b5a66SChristoph Hellwig ret = -EFBIG; 1367c9e9f97bSIlya Dryomov goto out_free; 1368f46b5a66SChristoph Hellwig } 1369f46b5a66SChristoph Hellwig 1370f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 1371f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1372f46b5a66SChristoph Hellwig 1373606686eeSJosef Bacik printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n", 1374606686eeSJosef Bacik rcu_str_deref(device->name), 1375606686eeSJosef Bacik (unsigned long long)new_size); 1376f46b5a66SChristoph Hellwig 1377f46b5a66SChristoph Hellwig if (new_size > old_size) { 1378a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 137998d5dc13STsutomu Itoh if (IS_ERR(trans)) { 138098d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1381c9e9f97bSIlya Dryomov goto out_free; 138298d5dc13STsutomu Itoh } 1383f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1384f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1385ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1386f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 1387f46b5a66SChristoph Hellwig } 1388f46b5a66SChristoph Hellwig 1389c9e9f97bSIlya Dryomov out_free: 1390f46b5a66SChristoph Hellwig kfree(vol_args); 1391c9e9f97bSIlya Dryomov out: 1392c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 1393f46b5a66SChristoph Hellwig return ret; 1394f46b5a66SChristoph Hellwig } 1395f46b5a66SChristoph Hellwig 139672fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 13976f72c7e2SArne Jansen char *name, unsigned long fd, int subvol, 13986f72c7e2SArne Jansen u64 *transid, bool readonly, 13996f72c7e2SArne Jansen struct btrfs_qgroup_inherit **inherit) 1400f46b5a66SChristoph Hellwig { 14013de4586cSChris Mason struct file *src_file; 1402f46b5a66SChristoph Hellwig int namelen; 14033de4586cSChris Mason int ret = 0; 1404f46b5a66SChristoph Hellwig 1405a874a63eSLiu Bo ret = mnt_want_write_file(file); 1406a874a63eSLiu Bo if (ret) 1407a874a63eSLiu Bo goto out; 1408a874a63eSLiu Bo 140972fd032eSSage Weil namelen = strlen(name); 141072fd032eSSage Weil if (strchr(name, '/')) { 1411f46b5a66SChristoph Hellwig ret = -EINVAL; 1412a874a63eSLiu Bo goto out_drop_write; 1413f46b5a66SChristoph Hellwig } 1414f46b5a66SChristoph Hellwig 141516780cabSChris Mason if (name[0] == '.' && 141616780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 141716780cabSChris Mason ret = -EEXIST; 1418a874a63eSLiu Bo goto out_drop_write; 141916780cabSChris Mason } 142016780cabSChris Mason 14213de4586cSChris Mason if (subvol) { 142272fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 14236f72c7e2SArne Jansen NULL, transid, readonly, inherit); 1424cb8e7090SChristoph Hellwig } else { 14253de4586cSChris Mason struct inode *src_inode; 142672fd032eSSage Weil src_file = fget(fd); 14273de4586cSChris Mason if (!src_file) { 14283de4586cSChris Mason ret = -EINVAL; 1429a874a63eSLiu Bo goto out_drop_write; 14303de4586cSChris Mason } 14313de4586cSChris Mason 14323de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 14333de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 1434d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 1435d397712bSChris Mason "another FS\n"); 14363de4586cSChris Mason ret = -EINVAL; 14373de4586cSChris Mason fput(src_file); 1438a874a63eSLiu Bo goto out_drop_write; 14393de4586cSChris Mason } 144072fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 144172fd032eSSage Weil BTRFS_I(src_inode)->root, 14426f72c7e2SArne Jansen transid, readonly, inherit); 14433de4586cSChris Mason fput(src_file); 1444cb8e7090SChristoph Hellwig } 1445a874a63eSLiu Bo out_drop_write: 1446a874a63eSLiu Bo mnt_drop_write_file(file); 1447f46b5a66SChristoph Hellwig out: 144872fd032eSSage Weil return ret; 144972fd032eSSage Weil } 145072fd032eSSage Weil 145172fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1452fa0d2b9bSLi Zefan void __user *arg, int subvol) 145372fd032eSSage Weil { 1454fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 145572fd032eSSage Weil int ret; 145672fd032eSSage Weil 1457fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1458fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1459fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1460fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1461fa0d2b9bSLi Zefan 1462fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1463b83cc969SLi Zefan vol_args->fd, subvol, 14646f72c7e2SArne Jansen NULL, false, NULL); 1465fa0d2b9bSLi Zefan 1466fa0d2b9bSLi Zefan kfree(vol_args); 1467fa0d2b9bSLi Zefan return ret; 1468fa0d2b9bSLi Zefan } 1469fa0d2b9bSLi Zefan 1470fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1471fa0d2b9bSLi Zefan void __user *arg, int subvol) 1472fa0d2b9bSLi Zefan { 1473fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1474fa0d2b9bSLi Zefan int ret; 1475fdfb1e4fSLi Zefan u64 transid = 0; 1476fdfb1e4fSLi Zefan u64 *ptr = NULL; 1477b83cc969SLi Zefan bool readonly = false; 14786f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 147972fd032eSSage Weil 1480fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1481fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1482fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1483fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1484fdfb1e4fSLi Zefan 1485b83cc969SLi Zefan if (vol_args->flags & 14866f72c7e2SArne Jansen ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | 14876f72c7e2SArne Jansen BTRFS_SUBVOL_QGROUP_INHERIT)) { 1488b83cc969SLi Zefan ret = -EOPNOTSUPP; 1489fdfb1e4fSLi Zefan goto out; 1490fdfb1e4fSLi Zefan } 1491fdfb1e4fSLi Zefan 1492fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1493fdfb1e4fSLi Zefan ptr = &transid; 1494b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1495b83cc969SLi Zefan readonly = true; 14966f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 14976f72c7e2SArne Jansen if (vol_args->size > PAGE_CACHE_SIZE) { 14986f72c7e2SArne Jansen ret = -EINVAL; 14996f72c7e2SArne Jansen goto out; 15006f72c7e2SArne Jansen } 15016f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 15026f72c7e2SArne Jansen if (IS_ERR(inherit)) { 15036f72c7e2SArne Jansen ret = PTR_ERR(inherit); 15046f72c7e2SArne Jansen goto out; 15056f72c7e2SArne Jansen } 15066f72c7e2SArne Jansen } 150775eaa0e2SSage Weil 1508fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 15096f72c7e2SArne Jansen vol_args->fd, subvol, ptr, 15106f72c7e2SArne Jansen readonly, &inherit); 151175eaa0e2SSage Weil 1512fdfb1e4fSLi Zefan if (ret == 0 && ptr && 151375eaa0e2SSage Weil copy_to_user(arg + 1514fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1515fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 151675eaa0e2SSage Weil ret = -EFAULT; 1517fdfb1e4fSLi Zefan out: 1518f46b5a66SChristoph Hellwig kfree(vol_args); 15196f72c7e2SArne Jansen kfree(inherit); 1520f46b5a66SChristoph Hellwig return ret; 1521f46b5a66SChristoph Hellwig } 1522f46b5a66SChristoph Hellwig 15230caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 15240caa102dSLi Zefan void __user *arg) 15250caa102dSLi Zefan { 15260caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 15270caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 15280caa102dSLi Zefan int ret = 0; 15290caa102dSLi Zefan u64 flags = 0; 15300caa102dSLi Zefan 153133345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 15320caa102dSLi Zefan return -EINVAL; 15330caa102dSLi Zefan 15340caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 15350caa102dSLi Zefan if (btrfs_root_readonly(root)) 15360caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 15370caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 15380caa102dSLi Zefan 15390caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 15400caa102dSLi Zefan ret = -EFAULT; 15410caa102dSLi Zefan 15420caa102dSLi Zefan return ret; 15430caa102dSLi Zefan } 15440caa102dSLi Zefan 15450caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 15460caa102dSLi Zefan void __user *arg) 15470caa102dSLi Zefan { 15480caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 15490caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 15500caa102dSLi Zefan struct btrfs_trans_handle *trans; 15510caa102dSLi Zefan u64 root_flags; 15520caa102dSLi Zefan u64 flags; 15530caa102dSLi Zefan int ret = 0; 15540caa102dSLi Zefan 1555b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1556b9ca0664SLiu Bo if (ret) 1557b9ca0664SLiu Bo goto out; 15580caa102dSLi Zefan 1559b9ca0664SLiu Bo if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 1560b9ca0664SLiu Bo ret = -EINVAL; 1561b9ca0664SLiu Bo goto out_drop_write; 1562b9ca0664SLiu Bo } 15630caa102dSLi Zefan 1564b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1565b9ca0664SLiu Bo ret = -EFAULT; 1566b9ca0664SLiu Bo goto out_drop_write; 1567b9ca0664SLiu Bo } 15680caa102dSLi Zefan 1569b9ca0664SLiu Bo if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { 1570b9ca0664SLiu Bo ret = -EINVAL; 1571b9ca0664SLiu Bo goto out_drop_write; 1572b9ca0664SLiu Bo } 15730caa102dSLi Zefan 1574b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1575b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1576b9ca0664SLiu Bo goto out_drop_write; 1577b9ca0664SLiu Bo } 15780caa102dSLi Zefan 1579b9ca0664SLiu Bo if (!inode_owner_or_capable(inode)) { 1580b9ca0664SLiu Bo ret = -EACCES; 1581b9ca0664SLiu Bo goto out_drop_write; 1582b9ca0664SLiu Bo } 1583b4dc2b8cSLi Zefan 15840caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 15850caa102dSLi Zefan 15860caa102dSLi Zefan /* nothing to do */ 15870caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1588b9ca0664SLiu Bo goto out_drop_sem; 15890caa102dSLi Zefan 15900caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 15910caa102dSLi Zefan if (flags & BTRFS_SUBVOL_RDONLY) 15920caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 15930caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 15940caa102dSLi Zefan else 15950caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 15960caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 15970caa102dSLi Zefan 15980caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 15990caa102dSLi Zefan if (IS_ERR(trans)) { 16000caa102dSLi Zefan ret = PTR_ERR(trans); 16010caa102dSLi Zefan goto out_reset; 16020caa102dSLi Zefan } 16030caa102dSLi Zefan 1604b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 16050caa102dSLi Zefan &root->root_key, &root->root_item); 16060caa102dSLi Zefan 16070caa102dSLi Zefan btrfs_commit_transaction(trans, root); 16080caa102dSLi Zefan out_reset: 16090caa102dSLi Zefan if (ret) 16100caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1611b9ca0664SLiu Bo out_drop_sem: 16120caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 1613b9ca0664SLiu Bo out_drop_write: 1614b9ca0664SLiu Bo mnt_drop_write_file(file); 1615b9ca0664SLiu Bo out: 16160caa102dSLi Zefan return ret; 16170caa102dSLi Zefan } 16180caa102dSLi Zefan 161976dda93cSYan, Zheng /* 162076dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 162176dda93cSYan, Zheng */ 162276dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 162376dda93cSYan, Zheng { 162476dda93cSYan, Zheng struct btrfs_path *path; 162576dda93cSYan, Zheng struct btrfs_key key; 162676dda93cSYan, Zheng int ret; 162776dda93cSYan, Zheng 162876dda93cSYan, Zheng path = btrfs_alloc_path(); 162976dda93cSYan, Zheng if (!path) 163076dda93cSYan, Zheng return -ENOMEM; 163176dda93cSYan, Zheng 163276dda93cSYan, Zheng key.objectid = root->root_key.objectid; 163376dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 163476dda93cSYan, Zheng key.offset = (u64)-1; 163576dda93cSYan, Zheng 163676dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 163776dda93cSYan, Zheng &key, path, 0, 0); 163876dda93cSYan, Zheng if (ret < 0) 163976dda93cSYan, Zheng goto out; 164076dda93cSYan, Zheng BUG_ON(ret == 0); 164176dda93cSYan, Zheng 164276dda93cSYan, Zheng ret = 0; 164376dda93cSYan, Zheng if (path->slots[0] > 0) { 164476dda93cSYan, Zheng path->slots[0]--; 164576dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 164676dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 164776dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 164876dda93cSYan, Zheng ret = -ENOTEMPTY; 164976dda93cSYan, Zheng } 165076dda93cSYan, Zheng out: 165176dda93cSYan, Zheng btrfs_free_path(path); 165276dda93cSYan, Zheng return ret; 165376dda93cSYan, Zheng } 165476dda93cSYan, Zheng 1655ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1656ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1657ac8e9819SChris Mason { 1658abc6e134SChris Mason struct btrfs_key test; 1659abc6e134SChris Mason int ret; 1660abc6e134SChris Mason 1661abc6e134SChris Mason test.objectid = sk->min_objectid; 1662abc6e134SChris Mason test.type = sk->min_type; 1663abc6e134SChris Mason test.offset = sk->min_offset; 1664abc6e134SChris Mason 1665abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1666abc6e134SChris Mason if (ret < 0) 1667ac8e9819SChris Mason return 0; 1668abc6e134SChris Mason 1669abc6e134SChris Mason test.objectid = sk->max_objectid; 1670abc6e134SChris Mason test.type = sk->max_type; 1671abc6e134SChris Mason test.offset = sk->max_offset; 1672abc6e134SChris Mason 1673abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1674abc6e134SChris Mason if (ret > 0) 1675ac8e9819SChris Mason return 0; 1676ac8e9819SChris Mason return 1; 1677ac8e9819SChris Mason } 1678ac8e9819SChris Mason 1679ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1680ac8e9819SChris Mason struct btrfs_path *path, 1681ac8e9819SChris Mason struct btrfs_key *key, 1682ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1683ac8e9819SChris Mason char *buf, 1684ac8e9819SChris Mason unsigned long *sk_offset, 1685ac8e9819SChris Mason int *num_found) 1686ac8e9819SChris Mason { 1687ac8e9819SChris Mason u64 found_transid; 1688ac8e9819SChris Mason struct extent_buffer *leaf; 1689ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1690ac8e9819SChris Mason unsigned long item_off; 1691ac8e9819SChris Mason unsigned long item_len; 1692ac8e9819SChris Mason int nritems; 1693ac8e9819SChris Mason int i; 1694ac8e9819SChris Mason int slot; 1695ac8e9819SChris Mason int ret = 0; 1696ac8e9819SChris Mason 1697ac8e9819SChris Mason leaf = path->nodes[0]; 1698ac8e9819SChris Mason slot = path->slots[0]; 1699ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1700ac8e9819SChris Mason 1701ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1702ac8e9819SChris Mason i = nritems; 1703ac8e9819SChris Mason goto advance_key; 1704ac8e9819SChris Mason } 1705ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1706ac8e9819SChris Mason 1707ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1708ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1709ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1710ac8e9819SChris Mason 1711ac8e9819SChris Mason if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1712ac8e9819SChris Mason item_len = 0; 1713ac8e9819SChris Mason 1714ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1715ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1716ac8e9819SChris Mason ret = 1; 1717ac8e9819SChris Mason goto overflow; 1718ac8e9819SChris Mason } 1719ac8e9819SChris Mason 1720ac8e9819SChris Mason btrfs_item_key_to_cpu(leaf, key, i); 1721ac8e9819SChris Mason if (!key_in_sk(key, sk)) 1722ac8e9819SChris Mason continue; 1723ac8e9819SChris Mason 1724ac8e9819SChris Mason sh.objectid = key->objectid; 1725ac8e9819SChris Mason sh.offset = key->offset; 1726ac8e9819SChris Mason sh.type = key->type; 1727ac8e9819SChris Mason sh.len = item_len; 1728ac8e9819SChris Mason sh.transid = found_transid; 1729ac8e9819SChris Mason 1730ac8e9819SChris Mason /* copy search result header */ 1731ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1732ac8e9819SChris Mason *sk_offset += sizeof(sh); 1733ac8e9819SChris Mason 1734ac8e9819SChris Mason if (item_len) { 1735ac8e9819SChris Mason char *p = buf + *sk_offset; 1736ac8e9819SChris Mason /* copy the item */ 1737ac8e9819SChris Mason read_extent_buffer(leaf, p, 1738ac8e9819SChris Mason item_off, item_len); 1739ac8e9819SChris Mason *sk_offset += item_len; 1740ac8e9819SChris Mason } 1741e2156867SHugo Mills (*num_found)++; 1742ac8e9819SChris Mason 1743ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1744ac8e9819SChris Mason break; 1745ac8e9819SChris Mason } 1746ac8e9819SChris Mason advance_key: 1747ac8e9819SChris Mason ret = 0; 1748abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1749abc6e134SChris Mason key->offset++; 1750abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1751abc6e134SChris Mason key->offset = 0; 1752abc6e134SChris Mason key->type++; 1753abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1754abc6e134SChris Mason key->offset = 0; 1755abc6e134SChris Mason key->type = 0; 1756abc6e134SChris Mason key->objectid++; 1757abc6e134SChris Mason } else 1758abc6e134SChris Mason ret = 1; 1759ac8e9819SChris Mason overflow: 1760ac8e9819SChris Mason return ret; 1761ac8e9819SChris Mason } 1762ac8e9819SChris Mason 1763ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1764ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1765ac8e9819SChris Mason { 1766ac8e9819SChris Mason struct btrfs_root *root; 1767ac8e9819SChris Mason struct btrfs_key key; 1768ac8e9819SChris Mason struct btrfs_key max_key; 1769ac8e9819SChris Mason struct btrfs_path *path; 1770ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1771ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1772ac8e9819SChris Mason int ret; 1773ac8e9819SChris Mason int num_found = 0; 1774ac8e9819SChris Mason unsigned long sk_offset = 0; 1775ac8e9819SChris Mason 1776ac8e9819SChris Mason path = btrfs_alloc_path(); 1777ac8e9819SChris Mason if (!path) 1778ac8e9819SChris Mason return -ENOMEM; 1779ac8e9819SChris Mason 1780ac8e9819SChris Mason if (sk->tree_id == 0) { 1781ac8e9819SChris Mason /* search the root of the inode that was passed */ 1782ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1783ac8e9819SChris Mason } else { 1784ac8e9819SChris Mason key.objectid = sk->tree_id; 1785ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1786ac8e9819SChris Mason key.offset = (u64)-1; 1787ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1788ac8e9819SChris Mason if (IS_ERR(root)) { 1789ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1790ac8e9819SChris Mason sk->tree_id); 1791ac8e9819SChris Mason btrfs_free_path(path); 1792ac8e9819SChris Mason return -ENOENT; 1793ac8e9819SChris Mason } 1794ac8e9819SChris Mason } 1795ac8e9819SChris Mason 1796ac8e9819SChris Mason key.objectid = sk->min_objectid; 1797ac8e9819SChris Mason key.type = sk->min_type; 1798ac8e9819SChris Mason key.offset = sk->min_offset; 1799ac8e9819SChris Mason 1800ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1801ac8e9819SChris Mason max_key.type = sk->max_type; 1802ac8e9819SChris Mason max_key.offset = sk->max_offset; 1803ac8e9819SChris Mason 1804ac8e9819SChris Mason path->keep_locks = 1; 1805ac8e9819SChris Mason 1806ac8e9819SChris Mason while(1) { 1807ac8e9819SChris Mason ret = btrfs_search_forward(root, &key, &max_key, path, 0, 1808ac8e9819SChris Mason sk->min_transid); 1809ac8e9819SChris Mason if (ret != 0) { 1810ac8e9819SChris Mason if (ret > 0) 1811ac8e9819SChris Mason ret = 0; 1812ac8e9819SChris Mason goto err; 1813ac8e9819SChris Mason } 1814ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1815ac8e9819SChris Mason &sk_offset, &num_found); 1816b3b4aa74SDavid Sterba btrfs_release_path(path); 1817ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1818ac8e9819SChris Mason break; 1819ac8e9819SChris Mason 1820ac8e9819SChris Mason } 1821ac8e9819SChris Mason ret = 0; 1822ac8e9819SChris Mason err: 1823ac8e9819SChris Mason sk->nr_items = num_found; 1824ac8e9819SChris Mason btrfs_free_path(path); 1825ac8e9819SChris Mason return ret; 1826ac8e9819SChris Mason } 1827ac8e9819SChris Mason 1828ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1829ac8e9819SChris Mason void __user *argp) 1830ac8e9819SChris Mason { 1831ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1832ac8e9819SChris Mason struct inode *inode; 1833ac8e9819SChris Mason int ret; 1834ac8e9819SChris Mason 1835ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1836ac8e9819SChris Mason return -EPERM; 1837ac8e9819SChris Mason 18382354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 18392354d08fSJulia Lawall if (IS_ERR(args)) 18402354d08fSJulia Lawall return PTR_ERR(args); 1841ac8e9819SChris Mason 1842ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1843ac8e9819SChris Mason ret = search_ioctl(inode, args); 1844ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1845ac8e9819SChris Mason ret = -EFAULT; 1846ac8e9819SChris Mason kfree(args); 1847ac8e9819SChris Mason return ret; 1848ac8e9819SChris Mason } 1849ac8e9819SChris Mason 185098d377a0STARUISI Hiroaki /* 1851ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1852ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 185398d377a0STARUISI Hiroaki */ 185498d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 185598d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 185698d377a0STARUISI Hiroaki { 185798d377a0STARUISI Hiroaki struct btrfs_root *root; 185898d377a0STARUISI Hiroaki struct btrfs_key key; 1859ac8e9819SChris Mason char *ptr; 186098d377a0STARUISI Hiroaki int ret = -1; 186198d377a0STARUISI Hiroaki int slot; 186298d377a0STARUISI Hiroaki int len; 186398d377a0STARUISI Hiroaki int total_len = 0; 186498d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 186598d377a0STARUISI Hiroaki struct extent_buffer *l; 186698d377a0STARUISI Hiroaki struct btrfs_path *path; 186798d377a0STARUISI Hiroaki 186898d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 186998d377a0STARUISI Hiroaki name[0]='\0'; 187098d377a0STARUISI Hiroaki return 0; 187198d377a0STARUISI Hiroaki } 187298d377a0STARUISI Hiroaki 187398d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 187498d377a0STARUISI Hiroaki if (!path) 187598d377a0STARUISI Hiroaki return -ENOMEM; 187698d377a0STARUISI Hiroaki 1877ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 187898d377a0STARUISI Hiroaki 187998d377a0STARUISI Hiroaki key.objectid = tree_id; 188098d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 188198d377a0STARUISI Hiroaki key.offset = (u64)-1; 188298d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 188398d377a0STARUISI Hiroaki if (IS_ERR(root)) { 188498d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 18858ad6fcabSChris Mason ret = -ENOENT; 18868ad6fcabSChris Mason goto out; 188798d377a0STARUISI Hiroaki } 188898d377a0STARUISI Hiroaki 188998d377a0STARUISI Hiroaki key.objectid = dirid; 189098d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 18918ad6fcabSChris Mason key.offset = (u64)-1; 189298d377a0STARUISI Hiroaki 189398d377a0STARUISI Hiroaki while(1) { 189498d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 189598d377a0STARUISI Hiroaki if (ret < 0) 189698d377a0STARUISI Hiroaki goto out; 189798d377a0STARUISI Hiroaki 189898d377a0STARUISI Hiroaki l = path->nodes[0]; 189998d377a0STARUISI Hiroaki slot = path->slots[0]; 19008ad6fcabSChris Mason if (ret > 0 && slot > 0) 19018ad6fcabSChris Mason slot--; 190298d377a0STARUISI Hiroaki btrfs_item_key_to_cpu(l, &key, slot); 190398d377a0STARUISI Hiroaki 190498d377a0STARUISI Hiroaki if (ret > 0 && (key.objectid != dirid || 1905ac8e9819SChris Mason key.type != BTRFS_INODE_REF_KEY)) { 1906ac8e9819SChris Mason ret = -ENOENT; 190798d377a0STARUISI Hiroaki goto out; 1908ac8e9819SChris Mason } 190998d377a0STARUISI Hiroaki 191098d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 191198d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 191298d377a0STARUISI Hiroaki ptr -= len + 1; 191398d377a0STARUISI Hiroaki total_len += len + 1; 1914ac8e9819SChris Mason if (ptr < name) 191598d377a0STARUISI Hiroaki goto out; 191698d377a0STARUISI Hiroaki 191798d377a0STARUISI Hiroaki *(ptr + len) = '/'; 191898d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 191998d377a0STARUISI Hiroaki 192098d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 192198d377a0STARUISI Hiroaki break; 192298d377a0STARUISI Hiroaki 1923b3b4aa74SDavid Sterba btrfs_release_path(path); 192498d377a0STARUISI Hiroaki key.objectid = key.offset; 19258ad6fcabSChris Mason key.offset = (u64)-1; 192698d377a0STARUISI Hiroaki dirid = key.objectid; 192798d377a0STARUISI Hiroaki } 1928ac8e9819SChris Mason if (ptr < name) 192998d377a0STARUISI Hiroaki goto out; 193077906a50SLi Zefan memmove(name, ptr, total_len); 193198d377a0STARUISI Hiroaki name[total_len]='\0'; 193298d377a0STARUISI Hiroaki ret = 0; 193398d377a0STARUISI Hiroaki out: 193498d377a0STARUISI Hiroaki btrfs_free_path(path); 1935ac8e9819SChris Mason return ret; 1936ac8e9819SChris Mason } 1937ac8e9819SChris Mason 1938ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 1939ac8e9819SChris Mason void __user *argp) 1940ac8e9819SChris Mason { 1941ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 1942ac8e9819SChris Mason struct inode *inode; 1943ac8e9819SChris Mason int ret; 1944ac8e9819SChris Mason 1945ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1946ac8e9819SChris Mason return -EPERM; 1947ac8e9819SChris Mason 19482354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 19492354d08fSJulia Lawall if (IS_ERR(args)) 19502354d08fSJulia Lawall return PTR_ERR(args); 1951c2b96929SDan Carpenter 1952ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1953ac8e9819SChris Mason 19541b53ac4dSChris Mason if (args->treeid == 0) 19551b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 19561b53ac4dSChris Mason 1957ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 1958ac8e9819SChris Mason args->treeid, args->objectid, 1959ac8e9819SChris Mason args->name); 1960ac8e9819SChris Mason 1961ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1962ac8e9819SChris Mason ret = -EFAULT; 1963ac8e9819SChris Mason 1964ac8e9819SChris Mason kfree(args); 196598d377a0STARUISI Hiroaki return ret; 196698d377a0STARUISI Hiroaki } 196798d377a0STARUISI Hiroaki 196876dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 196976dda93cSYan, Zheng void __user *arg) 197076dda93cSYan, Zheng { 197176dda93cSYan, Zheng struct dentry *parent = fdentry(file); 197276dda93cSYan, Zheng struct dentry *dentry; 197376dda93cSYan, Zheng struct inode *dir = parent->d_inode; 197476dda93cSYan, Zheng struct inode *inode; 197576dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 197676dda93cSYan, Zheng struct btrfs_root *dest = NULL; 197776dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 197876dda93cSYan, Zheng struct btrfs_trans_handle *trans; 197976dda93cSYan, Zheng int namelen; 198076dda93cSYan, Zheng int ret; 198176dda93cSYan, Zheng int err = 0; 198276dda93cSYan, Zheng 198376dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 198476dda93cSYan, Zheng if (IS_ERR(vol_args)) 198576dda93cSYan, Zheng return PTR_ERR(vol_args); 198676dda93cSYan, Zheng 198776dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 198876dda93cSYan, Zheng namelen = strlen(vol_args->name); 198976dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 199076dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 199176dda93cSYan, Zheng err = -EINVAL; 199276dda93cSYan, Zheng goto out; 199376dda93cSYan, Zheng } 199476dda93cSYan, Zheng 1995a561be71SAl Viro err = mnt_want_write_file(file); 199676dda93cSYan, Zheng if (err) 199776dda93cSYan, Zheng goto out; 199876dda93cSYan, Zheng 199976dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 200076dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 200176dda93cSYan, Zheng if (IS_ERR(dentry)) { 200276dda93cSYan, Zheng err = PTR_ERR(dentry); 200376dda93cSYan, Zheng goto out_unlock_dir; 200476dda93cSYan, Zheng } 200576dda93cSYan, Zheng 200676dda93cSYan, Zheng if (!dentry->d_inode) { 200776dda93cSYan, Zheng err = -ENOENT; 200876dda93cSYan, Zheng goto out_dput; 200976dda93cSYan, Zheng } 201076dda93cSYan, Zheng 201176dda93cSYan, Zheng inode = dentry->d_inode; 20124260f7c7SSage Weil dest = BTRFS_I(inode)->root; 20134260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)){ 20144260f7c7SSage Weil /* 20154260f7c7SSage Weil * Regular user. Only allow this with a special mount 20164260f7c7SSage Weil * option, when the user has write+exec access to the 20174260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 20184260f7c7SSage Weil * allowed. 20194260f7c7SSage Weil * 20204260f7c7SSage Weil * Note that this is _not_ check that the subvol is 20214260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 20224260f7c7SSage Weil * otherwise be able to delete. 20234260f7c7SSage Weil * 20244260f7c7SSage Weil * Users who want to delete empty subvols should try 20254260f7c7SSage Weil * rmdir(2). 20264260f7c7SSage Weil */ 20274260f7c7SSage Weil err = -EPERM; 20284260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 20294260f7c7SSage Weil goto out_dput; 20304260f7c7SSage Weil 20314260f7c7SSage Weil /* 20324260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 20334260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 20344260f7c7SSage Weil * must be called on the dentry referencing the root 20354260f7c7SSage Weil * of the subvol, not a random directory contained 20364260f7c7SSage Weil * within it. 20374260f7c7SSage Weil */ 20384260f7c7SSage Weil err = -EINVAL; 20394260f7c7SSage Weil if (root == dest) 20404260f7c7SSage Weil goto out_dput; 20414260f7c7SSage Weil 20424260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 20434260f7c7SSage Weil if (err) 20444260f7c7SSage Weil goto out_dput; 20454260f7c7SSage Weil 20464260f7c7SSage Weil /* check if subvolume may be deleted by a non-root user */ 20474260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 20484260f7c7SSage Weil if (err) 20494260f7c7SSage Weil goto out_dput; 20504260f7c7SSage Weil } 20514260f7c7SSage Weil 205233345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 205376dda93cSYan, Zheng err = -EINVAL; 205476dda93cSYan, Zheng goto out_dput; 205576dda93cSYan, Zheng } 205676dda93cSYan, Zheng 205776dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 205876dda93cSYan, Zheng err = d_invalidate(dentry); 205976dda93cSYan, Zheng if (err) 206076dda93cSYan, Zheng goto out_unlock; 206176dda93cSYan, Zheng 206276dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 206376dda93cSYan, Zheng 206476dda93cSYan, Zheng err = may_destroy_subvol(dest); 206576dda93cSYan, Zheng if (err) 206676dda93cSYan, Zheng goto out_up_write; 206776dda93cSYan, Zheng 2068a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 2069a22285a6SYan, Zheng if (IS_ERR(trans)) { 2070a22285a6SYan, Zheng err = PTR_ERR(trans); 2071d327099aSDan Carpenter goto out_up_write; 2072a22285a6SYan, Zheng } 2073a22285a6SYan, Zheng trans->block_rsv = &root->fs_info->global_block_rsv; 2074a22285a6SYan, Zheng 207576dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 207676dda93cSYan, Zheng dest->root_key.objectid, 207776dda93cSYan, Zheng dentry->d_name.name, 207876dda93cSYan, Zheng dentry->d_name.len); 207979787eaaSJeff Mahoney if (ret) { 208079787eaaSJeff Mahoney err = ret; 208179787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 208279787eaaSJeff Mahoney goto out_end_trans; 208379787eaaSJeff Mahoney } 208476dda93cSYan, Zheng 208576dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 208676dda93cSYan, Zheng 208776dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 208876dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 208976dda93cSYan, Zheng dest->root_item.drop_level = 0; 209076dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 209176dda93cSYan, Zheng 2092d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 209376dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 209476dda93cSYan, Zheng root->fs_info->tree_root, 209576dda93cSYan, Zheng dest->root_key.objectid); 209679787eaaSJeff Mahoney if (ret) { 209779787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 209879787eaaSJeff Mahoney err = ret; 209979787eaaSJeff Mahoney goto out_end_trans; 2100d68fc57bSYan, Zheng } 210179787eaaSJeff Mahoney } 210279787eaaSJeff Mahoney out_end_trans: 2103531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 210479787eaaSJeff Mahoney if (ret && !err) 210579787eaaSJeff Mahoney err = ret; 210676dda93cSYan, Zheng inode->i_flags |= S_DEAD; 210776dda93cSYan, Zheng out_up_write: 210876dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 210976dda93cSYan, Zheng out_unlock: 211076dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 211176dda93cSYan, Zheng if (!err) { 2112efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 211376dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 211476dda93cSYan, Zheng d_delete(dentry); 211576dda93cSYan, Zheng } 211676dda93cSYan, Zheng out_dput: 211776dda93cSYan, Zheng dput(dentry); 211876dda93cSYan, Zheng out_unlock_dir: 211976dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 21202a79f17eSAl Viro mnt_drop_write_file(file); 212176dda93cSYan, Zheng out: 212276dda93cSYan, Zheng kfree(vol_args); 212376dda93cSYan, Zheng return err; 212476dda93cSYan, Zheng } 212576dda93cSYan, Zheng 21261e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2127f46b5a66SChristoph Hellwig { 2128f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2129f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 21301e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2131c146afadSYan Zheng int ret; 2132c146afadSYan Zheng 2133b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2134b83cc969SLi Zefan return -EROFS; 2135b83cc969SLi Zefan 2136a561be71SAl Viro ret = mnt_want_write_file(file); 2137c146afadSYan Zheng if (ret) 2138c146afadSYan Zheng return ret; 2139f46b5a66SChristoph Hellwig 2140f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2141f46b5a66SChristoph Hellwig case S_IFDIR: 2142e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2143e441d54dSChris Mason ret = -EPERM; 2144e441d54dSChris Mason goto out; 2145e441d54dSChris Mason } 21468929ecfaSYan, Zheng ret = btrfs_defrag_root(root, 0); 21478929ecfaSYan, Zheng if (ret) 21488929ecfaSYan, Zheng goto out; 21498929ecfaSYan, Zheng ret = btrfs_defrag_root(root->fs_info->extent_root, 0); 2150f46b5a66SChristoph Hellwig break; 2151f46b5a66SChristoph Hellwig case S_IFREG: 2152e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 2153e441d54dSChris Mason ret = -EINVAL; 2154e441d54dSChris Mason goto out; 2155e441d54dSChris Mason } 21561e701a32SChris Mason 21571e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 21581e701a32SChris Mason if (!range) { 21591e701a32SChris Mason ret = -ENOMEM; 21601e701a32SChris Mason goto out; 21611e701a32SChris Mason } 21621e701a32SChris Mason 21631e701a32SChris Mason if (argp) { 21641e701a32SChris Mason if (copy_from_user(range, argp, 21651e701a32SChris Mason sizeof(*range))) { 21661e701a32SChris Mason ret = -EFAULT; 21671e701a32SChris Mason kfree(range); 2168683be16eSDan Carpenter goto out; 21691e701a32SChris Mason } 21701e701a32SChris Mason /* compression requires us to start the IO */ 21711e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 21721e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 21731e701a32SChris Mason range->extent_thresh = (u32)-1; 21741e701a32SChris Mason } 21751e701a32SChris Mason } else { 21761e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 21771e701a32SChris Mason range->len = (u64)-1; 21781e701a32SChris Mason } 21794cb5300bSChris Mason ret = btrfs_defrag_file(fdentry(file)->d_inode, file, 21804cb5300bSChris Mason range, 0, 0); 21814cb5300bSChris Mason if (ret > 0) 21824cb5300bSChris Mason ret = 0; 21831e701a32SChris Mason kfree(range); 2184f46b5a66SChristoph Hellwig break; 21858929ecfaSYan, Zheng default: 21868929ecfaSYan, Zheng ret = -EINVAL; 2187f46b5a66SChristoph Hellwig } 2188e441d54dSChris Mason out: 21892a79f17eSAl Viro mnt_drop_write_file(file); 2190e441d54dSChris Mason return ret; 2191f46b5a66SChristoph Hellwig } 2192f46b5a66SChristoph Hellwig 2193b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2194f46b5a66SChristoph Hellwig { 2195f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2196f46b5a66SChristoph Hellwig int ret; 2197f46b5a66SChristoph Hellwig 2198e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2199e441d54dSChris Mason return -EPERM; 2200e441d54dSChris Mason 2201c9e9f97bSIlya Dryomov mutex_lock(&root->fs_info->volume_mutex); 2202c9e9f97bSIlya Dryomov if (root->fs_info->balance_ctl) { 2203c9e9f97bSIlya Dryomov printk(KERN_INFO "btrfs: balance in progress\n"); 2204c9e9f97bSIlya Dryomov ret = -EINVAL; 2205c9e9f97bSIlya Dryomov goto out; 2206c9e9f97bSIlya Dryomov } 2207c9e9f97bSIlya Dryomov 2208dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2209c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2210c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2211c9e9f97bSIlya Dryomov goto out; 2212c9e9f97bSIlya Dryomov } 2213f46b5a66SChristoph Hellwig 22145516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2215f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2216f46b5a66SChristoph Hellwig 2217f46b5a66SChristoph Hellwig kfree(vol_args); 2218c9e9f97bSIlya Dryomov out: 2219c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 2220f46b5a66SChristoph Hellwig return ret; 2221f46b5a66SChristoph Hellwig } 2222f46b5a66SChristoph Hellwig 2223b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 2224f46b5a66SChristoph Hellwig { 2225f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2226f46b5a66SChristoph Hellwig int ret; 2227f46b5a66SChristoph Hellwig 2228e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2229e441d54dSChris Mason return -EPERM; 2230e441d54dSChris Mason 2231c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 2232c146afadSYan Zheng return -EROFS; 2233c146afadSYan Zheng 2234c9e9f97bSIlya Dryomov mutex_lock(&root->fs_info->volume_mutex); 2235c9e9f97bSIlya Dryomov if (root->fs_info->balance_ctl) { 2236c9e9f97bSIlya Dryomov printk(KERN_INFO "btrfs: balance in progress\n"); 2237c9e9f97bSIlya Dryomov ret = -EINVAL; 2238c9e9f97bSIlya Dryomov goto out; 2239c9e9f97bSIlya Dryomov } 2240c9e9f97bSIlya Dryomov 2241dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2242c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2243c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2244c9e9f97bSIlya Dryomov goto out; 2245c9e9f97bSIlya Dryomov } 2246f46b5a66SChristoph Hellwig 22475516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2248f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 2249f46b5a66SChristoph Hellwig 2250f46b5a66SChristoph Hellwig kfree(vol_args); 2251c9e9f97bSIlya Dryomov out: 2252c9e9f97bSIlya Dryomov mutex_unlock(&root->fs_info->volume_mutex); 2253f46b5a66SChristoph Hellwig return ret; 2254f46b5a66SChristoph Hellwig } 2255f46b5a66SChristoph Hellwig 2256475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2257475f6387SJan Schmidt { 2258027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2259475f6387SJan Schmidt struct btrfs_device *device; 2260475f6387SJan Schmidt struct btrfs_device *next; 2261475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2262027ed2f0SLi Zefan int ret = 0; 2263475f6387SJan Schmidt 2264475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2265475f6387SJan Schmidt return -EPERM; 2266475f6387SJan Schmidt 2267027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2268027ed2f0SLi Zefan if (!fi_args) 2269027ed2f0SLi Zefan return -ENOMEM; 2270027ed2f0SLi Zefan 2271027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2272027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2273475f6387SJan Schmidt 2274475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2275475f6387SJan Schmidt list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { 2276027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2277027ed2f0SLi Zefan fi_args->max_id = device->devid; 2278475f6387SJan Schmidt } 2279475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2280475f6387SJan Schmidt 2281027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2282027ed2f0SLi Zefan ret = -EFAULT; 2283475f6387SJan Schmidt 2284027ed2f0SLi Zefan kfree(fi_args); 2285027ed2f0SLi Zefan return ret; 2286475f6387SJan Schmidt } 2287475f6387SJan Schmidt 2288475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2289475f6387SJan Schmidt { 2290475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2291475f6387SJan Schmidt struct btrfs_device *dev; 2292475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2293475f6387SJan Schmidt int ret = 0; 2294475f6387SJan Schmidt char *s_uuid = NULL; 2295475f6387SJan Schmidt char empty_uuid[BTRFS_UUID_SIZE] = {0}; 2296475f6387SJan Schmidt 2297475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2298475f6387SJan Schmidt return -EPERM; 2299475f6387SJan Schmidt 2300475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2301475f6387SJan Schmidt if (IS_ERR(di_args)) 2302475f6387SJan Schmidt return PTR_ERR(di_args); 2303475f6387SJan Schmidt 2304475f6387SJan Schmidt if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0) 2305475f6387SJan Schmidt s_uuid = di_args->uuid; 2306475f6387SJan Schmidt 2307475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2308475f6387SJan Schmidt dev = btrfs_find_device(root, di_args->devid, s_uuid, NULL); 2309475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2310475f6387SJan Schmidt 2311475f6387SJan Schmidt if (!dev) { 2312475f6387SJan Schmidt ret = -ENODEV; 2313475f6387SJan Schmidt goto out; 2314475f6387SJan Schmidt } 2315475f6387SJan Schmidt 2316475f6387SJan Schmidt di_args->devid = dev->devid; 2317475f6387SJan Schmidt di_args->bytes_used = dev->bytes_used; 2318475f6387SJan Schmidt di_args->total_bytes = dev->total_bytes; 2319475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2320a27202fbSJim Meyering if (dev->name) { 2321606686eeSJosef Bacik struct rcu_string *name; 2322606686eeSJosef Bacik 2323606686eeSJosef Bacik rcu_read_lock(); 2324606686eeSJosef Bacik name = rcu_dereference(dev->name); 2325606686eeSJosef Bacik strncpy(di_args->path, name->str, sizeof(di_args->path)); 2326606686eeSJosef Bacik rcu_read_unlock(); 2327a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 2328a27202fbSJim Meyering } else { 232999ba55adSStefan Behrens di_args->path[0] = '\0'; 2330a27202fbSJim Meyering } 2331475f6387SJan Schmidt 2332475f6387SJan Schmidt out: 2333475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2334475f6387SJan Schmidt ret = -EFAULT; 2335475f6387SJan Schmidt 2336475f6387SJan Schmidt kfree(di_args); 2337475f6387SJan Schmidt return ret; 2338475f6387SJan Schmidt } 2339475f6387SJan Schmidt 234076dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 2341b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 2342f46b5a66SChristoph Hellwig { 2343f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2344f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2345f46b5a66SChristoph Hellwig struct file *src_file; 2346f46b5a66SChristoph Hellwig struct inode *src; 2347f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2348f46b5a66SChristoph Hellwig struct btrfs_path *path; 2349f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 2350ae01a0abSYan Zheng char *buf; 2351ae01a0abSYan Zheng struct btrfs_key key; 2352f46b5a66SChristoph Hellwig u32 nritems; 2353f46b5a66SChristoph Hellwig int slot; 2354ae01a0abSYan Zheng int ret; 2355c5c9cd4dSSage Weil u64 len = olen; 2356c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 2357d20f7043SChris Mason 2358c5c9cd4dSSage Weil /* 2359c5c9cd4dSSage Weil * TODO: 2360c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 2361c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 2362c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 2363c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 2364c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 2365c5c9cd4dSSage Weil * they don't overlap)? 2366c5c9cd4dSSage Weil */ 2367c5c9cd4dSSage Weil 2368e441d54dSChris Mason /* the destination must be opened for writing */ 23692ebc3464SDan Rosenberg if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 2370e441d54dSChris Mason return -EINVAL; 2371e441d54dSChris Mason 2372b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2373b83cc969SLi Zefan return -EROFS; 2374b83cc969SLi Zefan 2375a561be71SAl Viro ret = mnt_want_write_file(file); 2376c146afadSYan Zheng if (ret) 2377c146afadSYan Zheng return ret; 2378c146afadSYan Zheng 2379c5c9cd4dSSage Weil src_file = fget(srcfd); 2380ab67b7c1SYan Zheng if (!src_file) { 2381ab67b7c1SYan Zheng ret = -EBADF; 2382ab67b7c1SYan Zheng goto out_drop_write; 2383ab67b7c1SYan Zheng } 23845dc64164SDan Rosenberg 2385362a20c5SDavid Sterba ret = -EXDEV; 2386362a20c5SDavid Sterba if (src_file->f_path.mnt != file->f_path.mnt) 2387362a20c5SDavid Sterba goto out_fput; 2388362a20c5SDavid Sterba 2389f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 2390f46b5a66SChristoph Hellwig 2391c5c9cd4dSSage Weil ret = -EINVAL; 2392c5c9cd4dSSage Weil if (src == inode) 2393c5c9cd4dSSage Weil goto out_fput; 2394c5c9cd4dSSage Weil 23955dc64164SDan Rosenberg /* the src must be open for reading */ 23965dc64164SDan Rosenberg if (!(src_file->f_mode & FMODE_READ)) 23975dc64164SDan Rosenberg goto out_fput; 23985dc64164SDan Rosenberg 23990e7b824cSLi Zefan /* don't make the dst file partly checksummed */ 24000e7b824cSLi Zefan if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 24010e7b824cSLi Zefan (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 24020e7b824cSLi Zefan goto out_fput; 24030e7b824cSLi Zefan 2404ae01a0abSYan Zheng ret = -EISDIR; 2405ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 2406f46b5a66SChristoph Hellwig goto out_fput; 2407f46b5a66SChristoph Hellwig 2408ae01a0abSYan Zheng ret = -EXDEV; 2409362a20c5SDavid Sterba if (src->i_sb != inode->i_sb) 2410ae01a0abSYan Zheng goto out_fput; 2411ae01a0abSYan Zheng 2412ae01a0abSYan Zheng ret = -ENOMEM; 2413ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 2414ae01a0abSYan Zheng if (!buf) 2415ae01a0abSYan Zheng goto out_fput; 2416ae01a0abSYan Zheng 2417ae01a0abSYan Zheng path = btrfs_alloc_path(); 2418ae01a0abSYan Zheng if (!path) { 2419ae01a0abSYan Zheng vfree(buf); 2420ae01a0abSYan Zheng goto out_fput; 2421ae01a0abSYan Zheng } 2422ae01a0abSYan Zheng path->reada = 2; 2423ae01a0abSYan Zheng 2424f46b5a66SChristoph Hellwig if (inode < src) { 2425fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 2426fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 2427f46b5a66SChristoph Hellwig } else { 2428fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 2429fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 2430f46b5a66SChristoph Hellwig } 2431f46b5a66SChristoph Hellwig 2432c5c9cd4dSSage Weil /* determine range to clone */ 2433c5c9cd4dSSage Weil ret = -EINVAL; 24342ebc3464SDan Rosenberg if (off + len > src->i_size || off + len < off) 2435f46b5a66SChristoph Hellwig goto out_unlock; 2436c5c9cd4dSSage Weil if (len == 0) 2437c5c9cd4dSSage Weil olen = len = src->i_size - off; 2438c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 2439c5c9cd4dSSage Weil if (off + len == src->i_size) 24402a6b8daeSLi Zefan len = ALIGN(src->i_size, bs) - off; 2441c5c9cd4dSSage Weil 2442c5c9cd4dSSage Weil /* verify the end result is block aligned */ 24432a6b8daeSLi Zefan if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 24442a6b8daeSLi Zefan !IS_ALIGNED(destoff, bs)) 2445c5c9cd4dSSage Weil goto out_unlock; 2446c5c9cd4dSSage Weil 2447d525e8abSLi Zefan if (destoff > inode->i_size) { 2448d525e8abSLi Zefan ret = btrfs_cont_expand(inode, inode->i_size, destoff); 2449d525e8abSLi Zefan if (ret) 2450d525e8abSLi Zefan goto out_unlock; 2451d525e8abSLi Zefan } 2452d525e8abSLi Zefan 245371ef0786SLi Zefan /* truncate page cache pages from target inode range */ 245471ef0786SLi Zefan truncate_inode_pages_range(&inode->i_data, destoff, 245571ef0786SLi Zefan PAGE_CACHE_ALIGN(destoff + len) - 1); 245671ef0786SLi Zefan 2457f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 2458f46b5a66SChristoph Hellwig another, and lock file content */ 2459f46b5a66SChristoph Hellwig while (1) { 246031840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 2461d0082371SJeff Mahoney lock_extent(&BTRFS_I(src)->io_tree, off, off+len); 24629a019196SSage Weil ordered = btrfs_lookup_first_ordered_extent(src, off+len); 24639a019196SSage Weil if (!ordered && 24649a019196SSage Weil !test_range_bit(&BTRFS_I(src)->io_tree, off, off+len, 24659a019196SSage Weil EXTENT_DELALLOC, 0, NULL)) 2466f46b5a66SChristoph Hellwig break; 2467d0082371SJeff Mahoney unlock_extent(&BTRFS_I(src)->io_tree, off, off+len); 2468ae01a0abSYan Zheng if (ordered) 2469ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 24709a019196SSage Weil btrfs_wait_ordered_range(src, off, len); 2471f46b5a66SChristoph Hellwig } 2472f46b5a66SChristoph Hellwig 2473c5c9cd4dSSage Weil /* clone data */ 247433345d01SLi Zefan key.objectid = btrfs_ino(src); 2475ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 2476ae01a0abSYan Zheng key.offset = 0; 2477f46b5a66SChristoph Hellwig 2478f46b5a66SChristoph Hellwig while (1) { 2479f46b5a66SChristoph Hellwig /* 2480f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 2481f46b5a66SChristoph Hellwig * tree. 2482f46b5a66SChristoph Hellwig */ 2483362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 2484362a20c5SDavid Sterba 0, 0); 2485f46b5a66SChristoph Hellwig if (ret < 0) 2486f46b5a66SChristoph Hellwig goto out; 2487f46b5a66SChristoph Hellwig 2488ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2489ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 2490362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 2491f46b5a66SChristoph Hellwig if (ret < 0) 2492f46b5a66SChristoph Hellwig goto out; 2493f46b5a66SChristoph Hellwig if (ret > 0) 2494f46b5a66SChristoph Hellwig break; 2495ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2496f46b5a66SChristoph Hellwig } 2497f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 2498f46b5a66SChristoph Hellwig slot = path->slots[0]; 2499f46b5a66SChristoph Hellwig 2500ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 2501d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 250233345d01SLi Zefan key.objectid != btrfs_ino(src)) 2503f46b5a66SChristoph Hellwig break; 2504f46b5a66SChristoph Hellwig 2505c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 2506c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 2507c5c9cd4dSSage Weil int type; 250831840ae1SZheng Yan u32 size; 250931840ae1SZheng Yan struct btrfs_key new_key; 2510c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 2511c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 2512c5c9cd4dSSage Weil u8 comp; 2513b5384d48SSage Weil u64 endoff; 251431840ae1SZheng Yan 251531840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 251631840ae1SZheng Yan read_extent_buffer(leaf, buf, 251731840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 251831840ae1SZheng Yan size); 2519c5c9cd4dSSage Weil 2520c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 2521c5c9cd4dSSage Weil struct btrfs_file_extent_item); 2522c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 2523c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 2524c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2525c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2526d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 2527d397712bSChris Mason extent); 2528d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 2529d397712bSChris Mason extent); 2530c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 2531d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 2532d397712bSChris Mason extent); 2533c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2534c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 2535c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 2536c5c9cd4dSSage Weil extent); 2537c5c9cd4dSSage Weil } 2538b3b4aa74SDavid Sterba btrfs_release_path(path); 253931840ae1SZheng Yan 2540050006a7SSage Weil if (key.offset + datal <= off || 2541c5c9cd4dSSage Weil key.offset >= off+len) 2542c5c9cd4dSSage Weil goto next; 2543c5c9cd4dSSage Weil 254431840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 254533345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 25464d728ec7SLi Zefan if (off <= key.offset) 2547c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 25484d728ec7SLi Zefan else 25494d728ec7SLi Zefan new_key.offset = destoff; 2550c5c9cd4dSSage Weil 2551b6f3409bSSage Weil /* 2552b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 2553b6f3409bSSage Weil * 1 - add new extent 2554b6f3409bSSage Weil * 1 - inode update 2555b6f3409bSSage Weil */ 2556b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 2557a22285a6SYan, Zheng if (IS_ERR(trans)) { 2558a22285a6SYan, Zheng ret = PTR_ERR(trans); 2559a22285a6SYan, Zheng goto out; 2560a22285a6SYan, Zheng } 2561a22285a6SYan, Zheng 2562c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2563c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2564d72c0842SLi Zefan /* 2565d72c0842SLi Zefan * a | --- range to clone ---| b 2566d72c0842SLi Zefan * | ------------- extent ------------- | 2567d72c0842SLi Zefan */ 2568d72c0842SLi Zefan 2569d72c0842SLi Zefan /* substract range b */ 2570d72c0842SLi Zefan if (key.offset + datal > off + len) 2571d72c0842SLi Zefan datal = off + len - key.offset; 2572d72c0842SLi Zefan 2573d72c0842SLi Zefan /* substract range a */ 2574a22285a6SYan, Zheng if (off > key.offset) { 2575a22285a6SYan, Zheng datao += off - key.offset; 2576a22285a6SYan, Zheng datal -= off - key.offset; 2577a22285a6SYan, Zheng } 2578a22285a6SYan, Zheng 25795dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 2580a22285a6SYan, Zheng new_key.offset, 2581a22285a6SYan, Zheng new_key.offset + datal, 25822671485dSJosef Bacik 1); 258379787eaaSJeff Mahoney if (ret) { 258479787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 258579787eaaSJeff Mahoney ret); 258679787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 258779787eaaSJeff Mahoney goto out; 258879787eaaSJeff Mahoney } 2589a22285a6SYan, Zheng 259031840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 259131840ae1SZheng Yan &new_key, size); 259279787eaaSJeff Mahoney if (ret) { 259379787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 259479787eaaSJeff Mahoney ret); 259579787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 259679787eaaSJeff Mahoney goto out; 259779787eaaSJeff Mahoney } 259831840ae1SZheng Yan 259931840ae1SZheng Yan leaf = path->nodes[0]; 260031840ae1SZheng Yan slot = path->slots[0]; 260131840ae1SZheng Yan write_extent_buffer(leaf, buf, 260231840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 260331840ae1SZheng Yan size); 2604ae01a0abSYan Zheng 2605f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 2606f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 2607c5c9cd4dSSage Weil 2608c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 2609c5c9cd4dSSage Weil if (!disko) 2610c5c9cd4dSSage Weil datao = 0; 2611c5c9cd4dSSage Weil 2612c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 2613c5c9cd4dSSage Weil datao); 2614c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 2615c5c9cd4dSSage Weil datal); 2616c5c9cd4dSSage Weil if (disko) { 2617c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2618ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 26195d4f98a2SYan Zheng disko, diskl, 0, 2620f46b5a66SChristoph Hellwig root->root_key.objectid, 262133345d01SLi Zefan btrfs_ino(inode), 262266d7e7f0SArne Jansen new_key.offset - datao, 262366d7e7f0SArne Jansen 0); 262479787eaaSJeff Mahoney if (ret) { 262579787eaaSJeff Mahoney btrfs_abort_transaction(trans, 262679787eaaSJeff Mahoney root, 262779787eaaSJeff Mahoney ret); 262879787eaaSJeff Mahoney btrfs_end_transaction(trans, 262979787eaaSJeff Mahoney root); 263079787eaaSJeff Mahoney goto out; 263179787eaaSJeff Mahoney 263279787eaaSJeff Mahoney } 2633f46b5a66SChristoph Hellwig } 2634c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2635c5c9cd4dSSage Weil u64 skip = 0; 2636c5c9cd4dSSage Weil u64 trim = 0; 2637c5c9cd4dSSage Weil if (off > key.offset) { 2638c5c9cd4dSSage Weil skip = off - key.offset; 2639c5c9cd4dSSage Weil new_key.offset += skip; 264031840ae1SZheng Yan } 2641d397712bSChris Mason 2642c5c9cd4dSSage Weil if (key.offset + datal > off+len) 2643c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 2644d397712bSChris Mason 2645c5c9cd4dSSage Weil if (comp && (skip || trim)) { 2646c5c9cd4dSSage Weil ret = -EINVAL; 2647a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 2648c5c9cd4dSSage Weil goto out; 264931840ae1SZheng Yan } 2650c5c9cd4dSSage Weil size -= skip + trim; 2651c5c9cd4dSSage Weil datal -= skip + trim; 2652a22285a6SYan, Zheng 26535dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 2654a22285a6SYan, Zheng new_key.offset, 2655a22285a6SYan, Zheng new_key.offset + datal, 26562671485dSJosef Bacik 1); 265779787eaaSJeff Mahoney if (ret) { 265879787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 265979787eaaSJeff Mahoney ret); 266079787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 266179787eaaSJeff Mahoney goto out; 266279787eaaSJeff Mahoney } 2663a22285a6SYan, Zheng 2664c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 2665c5c9cd4dSSage Weil &new_key, size); 266679787eaaSJeff Mahoney if (ret) { 266779787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, 266879787eaaSJeff Mahoney ret); 266979787eaaSJeff Mahoney btrfs_end_transaction(trans, root); 267079787eaaSJeff Mahoney goto out; 267179787eaaSJeff Mahoney } 2672c5c9cd4dSSage Weil 2673c5c9cd4dSSage Weil if (skip) { 2674d397712bSChris Mason u32 start = 2675d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 2676c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 2677c5c9cd4dSSage Weil datal); 2678c5c9cd4dSSage Weil } 2679c5c9cd4dSSage Weil 2680c5c9cd4dSSage Weil leaf = path->nodes[0]; 2681c5c9cd4dSSage Weil slot = path->slots[0]; 2682c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 2683c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 2684c5c9cd4dSSage Weil size); 2685c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2686c5c9cd4dSSage Weil } 2687c5c9cd4dSSage Weil 2688c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 2689b3b4aa74SDavid Sterba btrfs_release_path(path); 2690c5c9cd4dSSage Weil 26910c4d2d95SJosef Bacik inode_inc_iversion(inode); 2692a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 2693b5384d48SSage Weil 2694b5384d48SSage Weil /* 2695b5384d48SSage Weil * we round up to the block size at eof when 2696b5384d48SSage Weil * determining which extents to clone above, 2697b5384d48SSage Weil * but shouldn't round up the file size 2698b5384d48SSage Weil */ 2699b5384d48SSage Weil endoff = new_key.offset + datal; 27005f3888ffSLi Zefan if (endoff > destoff+olen) 27015f3888ffSLi Zefan endoff = destoff+olen; 2702b5384d48SSage Weil if (endoff > inode->i_size) 2703b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 2704b5384d48SSage Weil 2705a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 270679787eaaSJeff Mahoney if (ret) { 270779787eaaSJeff Mahoney btrfs_abort_transaction(trans, root, ret); 2708a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 270979787eaaSJeff Mahoney goto out; 271079787eaaSJeff Mahoney } 271179787eaaSJeff Mahoney ret = btrfs_end_transaction(trans, root); 2712a22285a6SYan, Zheng } 2713c5c9cd4dSSage Weil next: 2714b3b4aa74SDavid Sterba btrfs_release_path(path); 2715ae01a0abSYan Zheng key.offset++; 2716ae01a0abSYan Zheng } 2717f46b5a66SChristoph Hellwig ret = 0; 2718f46b5a66SChristoph Hellwig out: 2719b3b4aa74SDavid Sterba btrfs_release_path(path); 2720d0082371SJeff Mahoney unlock_extent(&BTRFS_I(src)->io_tree, off, off+len); 2721f46b5a66SChristoph Hellwig out_unlock: 2722f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 2723f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 2724ae01a0abSYan Zheng vfree(buf); 2725ae01a0abSYan Zheng btrfs_free_path(path); 2726f46b5a66SChristoph Hellwig out_fput: 2727f46b5a66SChristoph Hellwig fput(src_file); 2728ab67b7c1SYan Zheng out_drop_write: 27292a79f17eSAl Viro mnt_drop_write_file(file); 2730f46b5a66SChristoph Hellwig return ret; 2731f46b5a66SChristoph Hellwig } 2732f46b5a66SChristoph Hellwig 27337a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 2734c5c9cd4dSSage Weil { 2735c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 2736c5c9cd4dSSage Weil 27377a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 2738c5c9cd4dSSage Weil return -EFAULT; 2739c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 2740c5c9cd4dSSage Weil args.src_length, args.dest_offset); 2741c5c9cd4dSSage Weil } 2742c5c9cd4dSSage Weil 2743f46b5a66SChristoph Hellwig /* 2744f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2745f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2746f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2747f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2748f46b5a66SChristoph Hellwig */ 2749b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 2750f46b5a66SChristoph Hellwig { 2751f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2752f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2753f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 27541ab86aedSSage Weil int ret; 2755f46b5a66SChristoph Hellwig 27561ab86aedSSage Weil ret = -EPERM; 2757df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 2758f46b5a66SChristoph Hellwig goto out; 27591ab86aedSSage Weil 27601ab86aedSSage Weil ret = -EINPROGRESS; 27611ab86aedSSage Weil if (file->private_data) 27621ab86aedSSage Weil goto out; 27639ca9ee09SSage Weil 2764b83cc969SLi Zefan ret = -EROFS; 2765b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2766b83cc969SLi Zefan goto out; 2767b83cc969SLi Zefan 2768a561be71SAl Viro ret = mnt_want_write_file(file); 2769c146afadSYan Zheng if (ret) 2770c146afadSYan Zheng goto out; 2771c146afadSYan Zheng 2772a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 27739ca9ee09SSage Weil 2774f46b5a66SChristoph Hellwig ret = -ENOMEM; 27757a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 2776abd30bb0STsutomu Itoh if (IS_ERR(trans)) 27771ab86aedSSage Weil goto out_drop; 27781ab86aedSSage Weil 27791ab86aedSSage Weil file->private_data = trans; 27801ab86aedSSage Weil return 0; 27811ab86aedSSage Weil 27821ab86aedSSage Weil out_drop: 2783a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 27842a79f17eSAl Viro mnt_drop_write_file(file); 2785f46b5a66SChristoph Hellwig out: 2786f46b5a66SChristoph Hellwig return ret; 2787f46b5a66SChristoph Hellwig } 2788f46b5a66SChristoph Hellwig 27896ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 27906ef5ed0dSJosef Bacik { 27916ef5ed0dSJosef Bacik struct inode *inode = fdentry(file)->d_inode; 27926ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 27936ef5ed0dSJosef Bacik struct btrfs_root *new_root; 27946ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 27956ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 27966ef5ed0dSJosef Bacik struct btrfs_path *path; 27976ef5ed0dSJosef Bacik struct btrfs_key location; 27986ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 27996ef5ed0dSJosef Bacik u64 objectid = 0; 28006ef5ed0dSJosef Bacik u64 dir_id; 28016ef5ed0dSJosef Bacik 28026ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 28036ef5ed0dSJosef Bacik return -EPERM; 28046ef5ed0dSJosef Bacik 28056ef5ed0dSJosef Bacik if (copy_from_user(&objectid, argp, sizeof(objectid))) 28066ef5ed0dSJosef Bacik return -EFAULT; 28076ef5ed0dSJosef Bacik 28086ef5ed0dSJosef Bacik if (!objectid) 28096ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 28106ef5ed0dSJosef Bacik 28116ef5ed0dSJosef Bacik location.objectid = objectid; 28126ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 28136ef5ed0dSJosef Bacik location.offset = (u64)-1; 28146ef5ed0dSJosef Bacik 28156ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 28166ef5ed0dSJosef Bacik if (IS_ERR(new_root)) 28176ef5ed0dSJosef Bacik return PTR_ERR(new_root); 28186ef5ed0dSJosef Bacik 28196ef5ed0dSJosef Bacik if (btrfs_root_refs(&new_root->root_item) == 0) 28206ef5ed0dSJosef Bacik return -ENOENT; 28216ef5ed0dSJosef Bacik 28226ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 28236ef5ed0dSJosef Bacik if (!path) 28246ef5ed0dSJosef Bacik return -ENOMEM; 28256ef5ed0dSJosef Bacik path->leave_spinning = 1; 28266ef5ed0dSJosef Bacik 28276ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 282898d5dc13STsutomu Itoh if (IS_ERR(trans)) { 28296ef5ed0dSJosef Bacik btrfs_free_path(path); 283098d5dc13STsutomu Itoh return PTR_ERR(trans); 28316ef5ed0dSJosef Bacik } 28326ef5ed0dSJosef Bacik 28336c41761fSDavid Sterba dir_id = btrfs_super_root_dir(root->fs_info->super_copy); 28346ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 28356ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 2836cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 28376ef5ed0dSJosef Bacik btrfs_free_path(path); 28386ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 28396ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 28406ef5ed0dSJosef Bacik "this isn't going to work\n"); 28416ef5ed0dSJosef Bacik return -ENOENT; 28426ef5ed0dSJosef Bacik } 28436ef5ed0dSJosef Bacik 28446ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 28456ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 28466ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 28476ef5ed0dSJosef Bacik btrfs_free_path(path); 28486ef5ed0dSJosef Bacik 28492b0ce2c2SMitch Harder btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); 28506ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 28516ef5ed0dSJosef Bacik 28526ef5ed0dSJosef Bacik return 0; 28536ef5ed0dSJosef Bacik } 28546ef5ed0dSJosef Bacik 2855bf5fc093SJosef Bacik static void get_block_group_info(struct list_head *groups_list, 2856bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 2857bf5fc093SJosef Bacik { 2858bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 2859bf5fc093SJosef Bacik 2860bf5fc093SJosef Bacik space->total_bytes = 0; 2861bf5fc093SJosef Bacik space->used_bytes = 0; 2862bf5fc093SJosef Bacik space->flags = 0; 2863bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 2864bf5fc093SJosef Bacik space->flags = block_group->flags; 2865bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 2866bf5fc093SJosef Bacik space->used_bytes += 2867bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 2868bf5fc093SJosef Bacik } 2869bf5fc093SJosef Bacik } 2870bf5fc093SJosef Bacik 28711406e432SJosef Bacik long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 28721406e432SJosef Bacik { 28731406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 28741406e432SJosef Bacik struct btrfs_ioctl_space_info space; 28751406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 28767fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 287713f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 28781406e432SJosef Bacik struct btrfs_space_info *info; 2879bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 2880bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 2881bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 2882bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 2883bf5fc093SJosef Bacik int num_types = 4; 28847fde62bfSChris Mason int alloc_size; 28851406e432SJosef Bacik int ret = 0; 288651788b1bSDan Rosenberg u64 slot_count = 0; 2887bf5fc093SJosef Bacik int i, c; 28881406e432SJosef Bacik 28891406e432SJosef Bacik if (copy_from_user(&space_args, 28901406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 28911406e432SJosef Bacik sizeof(space_args))) 28921406e432SJosef Bacik return -EFAULT; 28931406e432SJosef Bacik 2894bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2895bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2896bf5fc093SJosef Bacik 2897bf5fc093SJosef Bacik info = NULL; 28987fde62bfSChris Mason rcu_read_lock(); 2899bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2900bf5fc093SJosef Bacik list) { 2901bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2902bf5fc093SJosef Bacik info = tmp; 2903bf5fc093SJosef Bacik break; 2904bf5fc093SJosef Bacik } 2905bf5fc093SJosef Bacik } 29067fde62bfSChris Mason rcu_read_unlock(); 29071406e432SJosef Bacik 2908bf5fc093SJosef Bacik if (!info) 2909bf5fc093SJosef Bacik continue; 2910bf5fc093SJosef Bacik 2911bf5fc093SJosef Bacik down_read(&info->groups_sem); 2912bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2913bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 2914bf5fc093SJosef Bacik slot_count++; 2915bf5fc093SJosef Bacik } 2916bf5fc093SJosef Bacik up_read(&info->groups_sem); 2917bf5fc093SJosef Bacik } 2918bf5fc093SJosef Bacik 29197fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 29207fde62bfSChris Mason if (space_args.space_slots == 0) { 29217fde62bfSChris Mason space_args.total_spaces = slot_count; 29227fde62bfSChris Mason goto out; 29237fde62bfSChris Mason } 2924bf5fc093SJosef Bacik 292551788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 2926bf5fc093SJosef Bacik 29277fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 2928bf5fc093SJosef Bacik 29297fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 29307fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 29317fde62bfSChris Mason */ 29327fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 29337fde62bfSChris Mason return -ENOMEM; 29347fde62bfSChris Mason 29357fde62bfSChris Mason space_args.total_spaces = 0; 29367fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 29377fde62bfSChris Mason if (!dest) 29387fde62bfSChris Mason return -ENOMEM; 29397fde62bfSChris Mason dest_orig = dest; 29407fde62bfSChris Mason 29417fde62bfSChris Mason /* now we have a buffer to copy into */ 2942bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2943bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2944bf5fc093SJosef Bacik 294551788b1bSDan Rosenberg if (!slot_count) 294651788b1bSDan Rosenberg break; 294751788b1bSDan Rosenberg 2948bf5fc093SJosef Bacik info = NULL; 29491406e432SJosef Bacik rcu_read_lock(); 2950bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2951bf5fc093SJosef Bacik list) { 2952bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2953bf5fc093SJosef Bacik info = tmp; 29547fde62bfSChris Mason break; 2955bf5fc093SJosef Bacik } 2956bf5fc093SJosef Bacik } 2957bf5fc093SJosef Bacik rcu_read_unlock(); 29587fde62bfSChris Mason 2959bf5fc093SJosef Bacik if (!info) 2960bf5fc093SJosef Bacik continue; 2961bf5fc093SJosef Bacik down_read(&info->groups_sem); 2962bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2963bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 2964bf5fc093SJosef Bacik get_block_group_info(&info->block_groups[c], 2965bf5fc093SJosef Bacik &space); 29667fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 29671406e432SJosef Bacik dest++; 29681406e432SJosef Bacik space_args.total_spaces++; 296951788b1bSDan Rosenberg slot_count--; 29701406e432SJosef Bacik } 297151788b1bSDan Rosenberg if (!slot_count) 297251788b1bSDan Rosenberg break; 2973bf5fc093SJosef Bacik } 2974bf5fc093SJosef Bacik up_read(&info->groups_sem); 2975bf5fc093SJosef Bacik } 29761406e432SJosef Bacik 29772eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 29787fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 29797fde62bfSChris Mason 29807fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 29817fde62bfSChris Mason ret = -EFAULT; 29827fde62bfSChris Mason 29837fde62bfSChris Mason kfree(dest_orig); 29847fde62bfSChris Mason out: 29857fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 29861406e432SJosef Bacik ret = -EFAULT; 29871406e432SJosef Bacik 29881406e432SJosef Bacik return ret; 29891406e432SJosef Bacik } 29901406e432SJosef Bacik 2991f46b5a66SChristoph Hellwig /* 2992f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2993f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2994f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2995f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2996f46b5a66SChristoph Hellwig */ 2997f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 2998f46b5a66SChristoph Hellwig { 2999f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 3000f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3001f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3002f46b5a66SChristoph Hellwig 3003f46b5a66SChristoph Hellwig trans = file->private_data; 30041ab86aedSSage Weil if (!trans) 30051ab86aedSSage Weil return -EINVAL; 3006b214107eSChristoph Hellwig file->private_data = NULL; 30079ca9ee09SSage Weil 30081ab86aedSSage Weil btrfs_end_transaction(trans, root); 30091ab86aedSSage Weil 3010a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 30119ca9ee09SSage Weil 30122a79f17eSAl Viro mnt_drop_write_file(file); 30131ab86aedSSage Weil return 0; 3014f46b5a66SChristoph Hellwig } 3015f46b5a66SChristoph Hellwig 301646204592SSage Weil static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp) 301746204592SSage Weil { 301846204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 301946204592SSage Weil struct btrfs_trans_handle *trans; 302046204592SSage Weil u64 transid; 3021db5b493aSTsutomu Itoh int ret; 302246204592SSage Weil 302346204592SSage Weil trans = btrfs_start_transaction(root, 0); 302498d5dc13STsutomu Itoh if (IS_ERR(trans)) 302598d5dc13STsutomu Itoh return PTR_ERR(trans); 302646204592SSage Weil transid = trans->transid; 3027db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 30288b2b2d3cSTsutomu Itoh if (ret) { 30298b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 3030db5b493aSTsutomu Itoh return ret; 30318b2b2d3cSTsutomu Itoh } 303246204592SSage Weil 303346204592SSage Weil if (argp) 303446204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 303546204592SSage Weil return -EFAULT; 303646204592SSage Weil return 0; 303746204592SSage Weil } 303846204592SSage Weil 303946204592SSage Weil static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) 304046204592SSage Weil { 304146204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 304246204592SSage Weil u64 transid; 304346204592SSage Weil 304446204592SSage Weil if (argp) { 304546204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 304646204592SSage Weil return -EFAULT; 304746204592SSage Weil } else { 304846204592SSage Weil transid = 0; /* current trans */ 304946204592SSage Weil } 305046204592SSage Weil return btrfs_wait_for_commit(root, transid); 305146204592SSage Weil } 305246204592SSage Weil 3053475f6387SJan Schmidt static long btrfs_ioctl_scrub(struct btrfs_root *root, void __user *arg) 3054475f6387SJan Schmidt { 3055475f6387SJan Schmidt int ret; 3056475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3057475f6387SJan Schmidt 3058475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3059475f6387SJan Schmidt return -EPERM; 3060475f6387SJan Schmidt 3061475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3062475f6387SJan Schmidt if (IS_ERR(sa)) 3063475f6387SJan Schmidt return PTR_ERR(sa); 3064475f6387SJan Schmidt 3065475f6387SJan Schmidt ret = btrfs_scrub_dev(root, sa->devid, sa->start, sa->end, 30668628764eSArne Jansen &sa->progress, sa->flags & BTRFS_SCRUB_READONLY); 3067475f6387SJan Schmidt 3068475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3069475f6387SJan Schmidt ret = -EFAULT; 3070475f6387SJan Schmidt 3071475f6387SJan Schmidt kfree(sa); 3072475f6387SJan Schmidt return ret; 3073475f6387SJan Schmidt } 3074475f6387SJan Schmidt 3075475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 3076475f6387SJan Schmidt { 3077475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3078475f6387SJan Schmidt return -EPERM; 3079475f6387SJan Schmidt 3080475f6387SJan Schmidt return btrfs_scrub_cancel(root); 3081475f6387SJan Schmidt } 3082475f6387SJan Schmidt 3083475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 3084475f6387SJan Schmidt void __user *arg) 3085475f6387SJan Schmidt { 3086475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3087475f6387SJan Schmidt int ret; 3088475f6387SJan Schmidt 3089475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3090475f6387SJan Schmidt return -EPERM; 3091475f6387SJan Schmidt 3092475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3093475f6387SJan Schmidt if (IS_ERR(sa)) 3094475f6387SJan Schmidt return PTR_ERR(sa); 3095475f6387SJan Schmidt 3096475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 3097475f6387SJan Schmidt 3098475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 3099475f6387SJan Schmidt ret = -EFAULT; 3100475f6387SJan Schmidt 3101475f6387SJan Schmidt kfree(sa); 3102475f6387SJan Schmidt return ret; 3103475f6387SJan Schmidt } 3104475f6387SJan Schmidt 3105c11d2c23SStefan Behrens static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, 3106b27f7c0cSDavid Sterba void __user *arg) 3107c11d2c23SStefan Behrens { 3108c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3109c11d2c23SStefan Behrens int ret; 3110c11d2c23SStefan Behrens 3111c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3112c11d2c23SStefan Behrens if (IS_ERR(sa)) 3113c11d2c23SStefan Behrens return PTR_ERR(sa); 3114c11d2c23SStefan Behrens 3115b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3116b27f7c0cSDavid Sterba kfree(sa); 3117b27f7c0cSDavid Sterba return -EPERM; 3118b27f7c0cSDavid Sterba } 3119b27f7c0cSDavid Sterba 3120b27f7c0cSDavid Sterba ret = btrfs_get_dev_stats(root, sa); 3121c11d2c23SStefan Behrens 3122c11d2c23SStefan Behrens if (copy_to_user(arg, sa, sizeof(*sa))) 3123c11d2c23SStefan Behrens ret = -EFAULT; 3124c11d2c23SStefan Behrens 3125c11d2c23SStefan Behrens kfree(sa); 3126c11d2c23SStefan Behrens return ret; 3127c11d2c23SStefan Behrens } 3128c11d2c23SStefan Behrens 3129d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3130d7728c96SJan Schmidt { 3131d7728c96SJan Schmidt int ret = 0; 3132d7728c96SJan Schmidt int i; 3133740c3d22SChris Mason u64 rel_ptr; 3134d7728c96SJan Schmidt int size; 3135806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3136d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3137d7728c96SJan Schmidt struct btrfs_path *path; 3138d7728c96SJan Schmidt 3139d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3140d7728c96SJan Schmidt return -EPERM; 3141d7728c96SJan Schmidt 3142d7728c96SJan Schmidt path = btrfs_alloc_path(); 3143d7728c96SJan Schmidt if (!path) { 3144d7728c96SJan Schmidt ret = -ENOMEM; 3145d7728c96SJan Schmidt goto out; 3146d7728c96SJan Schmidt } 3147d7728c96SJan Schmidt 3148d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3149d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3150d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3151d7728c96SJan Schmidt ipa = NULL; 3152d7728c96SJan Schmidt goto out; 3153d7728c96SJan Schmidt } 3154d7728c96SJan Schmidt 3155d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3156d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3157d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3158d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3159d7728c96SJan Schmidt ipath = NULL; 3160d7728c96SJan Schmidt goto out; 3161d7728c96SJan Schmidt } 3162d7728c96SJan Schmidt 3163d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3164d7728c96SJan Schmidt if (ret < 0) 3165d7728c96SJan Schmidt goto out; 3166d7728c96SJan Schmidt 3167d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3168745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3169745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3170740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3171d7728c96SJan Schmidt } 3172d7728c96SJan Schmidt 3173745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)ipa->fspath, 3174745c4d8eSJeff Mahoney (void *)(unsigned long)ipath->fspath, size); 3175d7728c96SJan Schmidt if (ret) { 3176d7728c96SJan Schmidt ret = -EFAULT; 3177d7728c96SJan Schmidt goto out; 3178d7728c96SJan Schmidt } 3179d7728c96SJan Schmidt 3180d7728c96SJan Schmidt out: 3181d7728c96SJan Schmidt btrfs_free_path(path); 3182d7728c96SJan Schmidt free_ipath(ipath); 3183d7728c96SJan Schmidt kfree(ipa); 3184d7728c96SJan Schmidt 3185d7728c96SJan Schmidt return ret; 3186d7728c96SJan Schmidt } 3187d7728c96SJan Schmidt 3188d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3189d7728c96SJan Schmidt { 3190d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3191d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3192d7728c96SJan Schmidt 3193d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3194d7728c96SJan Schmidt inodes->bytes_left -= c; 3195d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3196d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3197d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3198d7728c96SJan Schmidt inodes->elem_cnt += 3; 3199d7728c96SJan Schmidt } else { 3200d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3201d7728c96SJan Schmidt inodes->bytes_left = 0; 3202d7728c96SJan Schmidt inodes->elem_missed += 3; 3203d7728c96SJan Schmidt } 3204d7728c96SJan Schmidt 3205d7728c96SJan Schmidt return 0; 3206d7728c96SJan Schmidt } 3207d7728c96SJan Schmidt 3208d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 3209d7728c96SJan Schmidt void __user *arg) 3210d7728c96SJan Schmidt { 3211d7728c96SJan Schmidt int ret = 0; 3212d7728c96SJan Schmidt int size; 3213d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3214d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3215d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3216d7728c96SJan Schmidt 3217d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3218d7728c96SJan Schmidt return -EPERM; 3219d7728c96SJan Schmidt 3220d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 3221d7728c96SJan Schmidt if (IS_ERR(loi)) { 3222d7728c96SJan Schmidt ret = PTR_ERR(loi); 3223d7728c96SJan Schmidt loi = NULL; 3224d7728c96SJan Schmidt goto out; 3225d7728c96SJan Schmidt } 3226d7728c96SJan Schmidt 3227d7728c96SJan Schmidt path = btrfs_alloc_path(); 3228d7728c96SJan Schmidt if (!path) { 3229d7728c96SJan Schmidt ret = -ENOMEM; 3230d7728c96SJan Schmidt goto out; 3231d7728c96SJan Schmidt } 3232d7728c96SJan Schmidt 3233d7728c96SJan Schmidt size = min_t(u32, loi->size, 4096); 3234d7728c96SJan Schmidt inodes = init_data_container(size); 3235d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3236d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3237d7728c96SJan Schmidt inodes = NULL; 3238d7728c96SJan Schmidt goto out; 3239d7728c96SJan Schmidt } 3240d7728c96SJan Schmidt 3241df031f07SLiu Bo ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, 3242df031f07SLiu Bo build_ino_list, inodes); 3243df031f07SLiu Bo if (ret == -EINVAL) 3244d7728c96SJan Schmidt ret = -ENOENT; 3245d7728c96SJan Schmidt if (ret < 0) 3246d7728c96SJan Schmidt goto out; 3247d7728c96SJan Schmidt 3248745c4d8eSJeff Mahoney ret = copy_to_user((void *)(unsigned long)loi->inodes, 3249745c4d8eSJeff Mahoney (void *)(unsigned long)inodes, size); 3250d7728c96SJan Schmidt if (ret) 3251d7728c96SJan Schmidt ret = -EFAULT; 3252d7728c96SJan Schmidt 3253d7728c96SJan Schmidt out: 3254d7728c96SJan Schmidt btrfs_free_path(path); 3255d7728c96SJan Schmidt kfree(inodes); 3256d7728c96SJan Schmidt kfree(loi); 3257d7728c96SJan Schmidt 3258d7728c96SJan Schmidt return ret; 3259d7728c96SJan Schmidt } 3260d7728c96SJan Schmidt 326119a39dceSIlya Dryomov void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 3262c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3263c9e9f97bSIlya Dryomov { 3264c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3265c9e9f97bSIlya Dryomov 3266c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3267c9e9f97bSIlya Dryomov 3268837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_running)) 3269837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3270837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3271837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3272a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3273a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3274837d5b6eSIlya Dryomov 3275c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3276c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3277c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 327819a39dceSIlya Dryomov 327919a39dceSIlya Dryomov if (lock) { 328019a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 328119a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 328219a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 328319a39dceSIlya Dryomov } else { 328419a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 328519a39dceSIlya Dryomov } 3286c9e9f97bSIlya Dryomov } 3287c9e9f97bSIlya Dryomov 32889ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3289c9e9f97bSIlya Dryomov { 32909ba1f6e4SLiu Bo struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 3291c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3292c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3293c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3294c9e9f97bSIlya Dryomov int ret; 3295c9e9f97bSIlya Dryomov 3296c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3297c9e9f97bSIlya Dryomov return -EPERM; 3298c9e9f97bSIlya Dryomov 3299e54bfa31SLiu Bo ret = mnt_want_write_file(file); 33009ba1f6e4SLiu Bo if (ret) 33019ba1f6e4SLiu Bo return ret; 33029ba1f6e4SLiu Bo 3303c9e9f97bSIlya Dryomov mutex_lock(&fs_info->volume_mutex); 3304c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3305c9e9f97bSIlya Dryomov 3306c9e9f97bSIlya Dryomov if (arg) { 3307c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 3308c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 3309c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 3310c9e9f97bSIlya Dryomov goto out; 3311c9e9f97bSIlya Dryomov } 3312de322263SIlya Dryomov 3313de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3314de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3315de322263SIlya Dryomov ret = -ENOTCONN; 3316de322263SIlya Dryomov goto out_bargs; 3317de322263SIlya Dryomov } 3318de322263SIlya Dryomov 3319de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3320de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3321de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3322de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3323de322263SIlya Dryomov 3324de322263SIlya Dryomov goto do_balance; 3325de322263SIlya Dryomov } 3326c9e9f97bSIlya Dryomov } else { 3327c9e9f97bSIlya Dryomov bargs = NULL; 3328c9e9f97bSIlya Dryomov } 3329c9e9f97bSIlya Dryomov 3330837d5b6eSIlya Dryomov if (fs_info->balance_ctl) { 3331837d5b6eSIlya Dryomov ret = -EINPROGRESS; 3332837d5b6eSIlya Dryomov goto out_bargs; 3333837d5b6eSIlya Dryomov } 3334837d5b6eSIlya Dryomov 3335c9e9f97bSIlya Dryomov bctl = kzalloc(sizeof(*bctl), GFP_NOFS); 3336c9e9f97bSIlya Dryomov if (!bctl) { 3337c9e9f97bSIlya Dryomov ret = -ENOMEM; 3338c9e9f97bSIlya Dryomov goto out_bargs; 3339c9e9f97bSIlya Dryomov } 3340c9e9f97bSIlya Dryomov 3341c9e9f97bSIlya Dryomov bctl->fs_info = fs_info; 3342c9e9f97bSIlya Dryomov if (arg) { 3343c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 3344c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 3345c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 3346c9e9f97bSIlya Dryomov 3347c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 3348f43ffb60SIlya Dryomov } else { 3349f43ffb60SIlya Dryomov /* balance everything - no filters */ 3350f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 3351c9e9f97bSIlya Dryomov } 3352c9e9f97bSIlya Dryomov 3353de322263SIlya Dryomov do_balance: 3354c9e9f97bSIlya Dryomov ret = btrfs_balance(bctl, bargs); 3355c9e9f97bSIlya Dryomov /* 3356837d5b6eSIlya Dryomov * bctl is freed in __cancel_balance or in free_fs_info if 3357837d5b6eSIlya Dryomov * restriper was paused all the way until unmount 3358c9e9f97bSIlya Dryomov */ 3359c9e9f97bSIlya Dryomov if (arg) { 3360c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 3361c9e9f97bSIlya Dryomov ret = -EFAULT; 3362c9e9f97bSIlya Dryomov } 3363c9e9f97bSIlya Dryomov 3364c9e9f97bSIlya Dryomov out_bargs: 3365c9e9f97bSIlya Dryomov kfree(bargs); 3366c9e9f97bSIlya Dryomov out: 3367c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3368c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->volume_mutex); 3369e54bfa31SLiu Bo mnt_drop_write_file(file); 3370c9e9f97bSIlya Dryomov return ret; 3371c9e9f97bSIlya Dryomov } 3372c9e9f97bSIlya Dryomov 3373837d5b6eSIlya Dryomov static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) 3374837d5b6eSIlya Dryomov { 3375837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3376837d5b6eSIlya Dryomov return -EPERM; 3377837d5b6eSIlya Dryomov 3378837d5b6eSIlya Dryomov switch (cmd) { 3379837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 3380837d5b6eSIlya Dryomov return btrfs_pause_balance(root->fs_info); 3381a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 3382a7e99c69SIlya Dryomov return btrfs_cancel_balance(root->fs_info); 3383837d5b6eSIlya Dryomov } 3384837d5b6eSIlya Dryomov 3385837d5b6eSIlya Dryomov return -EINVAL; 3386837d5b6eSIlya Dryomov } 3387837d5b6eSIlya Dryomov 338819a39dceSIlya Dryomov static long btrfs_ioctl_balance_progress(struct btrfs_root *root, 338919a39dceSIlya Dryomov void __user *arg) 339019a39dceSIlya Dryomov { 339119a39dceSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 339219a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 339319a39dceSIlya Dryomov int ret = 0; 339419a39dceSIlya Dryomov 339519a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 339619a39dceSIlya Dryomov return -EPERM; 339719a39dceSIlya Dryomov 339819a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 339919a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 340019a39dceSIlya Dryomov ret = -ENOTCONN; 340119a39dceSIlya Dryomov goto out; 340219a39dceSIlya Dryomov } 340319a39dceSIlya Dryomov 340419a39dceSIlya Dryomov bargs = kzalloc(sizeof(*bargs), GFP_NOFS); 340519a39dceSIlya Dryomov if (!bargs) { 340619a39dceSIlya Dryomov ret = -ENOMEM; 340719a39dceSIlya Dryomov goto out; 340819a39dceSIlya Dryomov } 340919a39dceSIlya Dryomov 341019a39dceSIlya Dryomov update_ioctl_balance_args(fs_info, 1, bargs); 341119a39dceSIlya Dryomov 341219a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 341319a39dceSIlya Dryomov ret = -EFAULT; 341419a39dceSIlya Dryomov 341519a39dceSIlya Dryomov kfree(bargs); 341619a39dceSIlya Dryomov out: 341719a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 341819a39dceSIlya Dryomov return ret; 341919a39dceSIlya Dryomov } 342019a39dceSIlya Dryomov 34215d13a37bSArne Jansen static long btrfs_ioctl_quota_ctl(struct btrfs_root *root, void __user *arg) 34225d13a37bSArne Jansen { 34235d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 34245d13a37bSArne Jansen struct btrfs_trans_handle *trans = NULL; 34255d13a37bSArne Jansen int ret; 34265d13a37bSArne Jansen int err; 34275d13a37bSArne Jansen 34285d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 34295d13a37bSArne Jansen return -EPERM; 34305d13a37bSArne Jansen 34315d13a37bSArne Jansen if (root->fs_info->sb->s_flags & MS_RDONLY) 34325d13a37bSArne Jansen return -EROFS; 34335d13a37bSArne Jansen 34345d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 34355d13a37bSArne Jansen if (IS_ERR(sa)) 34365d13a37bSArne Jansen return PTR_ERR(sa); 34375d13a37bSArne Jansen 34385d13a37bSArne Jansen if (sa->cmd != BTRFS_QUOTA_CTL_RESCAN) { 34395d13a37bSArne Jansen trans = btrfs_start_transaction(root, 2); 34405d13a37bSArne Jansen if (IS_ERR(trans)) { 34415d13a37bSArne Jansen ret = PTR_ERR(trans); 34425d13a37bSArne Jansen goto out; 34435d13a37bSArne Jansen } 34445d13a37bSArne Jansen } 34455d13a37bSArne Jansen 34465d13a37bSArne Jansen switch (sa->cmd) { 34475d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 34485d13a37bSArne Jansen ret = btrfs_quota_enable(trans, root->fs_info); 34495d13a37bSArne Jansen break; 34505d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 34515d13a37bSArne Jansen ret = btrfs_quota_disable(trans, root->fs_info); 34525d13a37bSArne Jansen break; 34535d13a37bSArne Jansen case BTRFS_QUOTA_CTL_RESCAN: 34545d13a37bSArne Jansen ret = btrfs_quota_rescan(root->fs_info); 34555d13a37bSArne Jansen break; 34565d13a37bSArne Jansen default: 34575d13a37bSArne Jansen ret = -EINVAL; 34585d13a37bSArne Jansen break; 34595d13a37bSArne Jansen } 34605d13a37bSArne Jansen 34615d13a37bSArne Jansen if (copy_to_user(arg, sa, sizeof(*sa))) 34625d13a37bSArne Jansen ret = -EFAULT; 34635d13a37bSArne Jansen 34645d13a37bSArne Jansen if (trans) { 34655d13a37bSArne Jansen err = btrfs_commit_transaction(trans, root); 34665d13a37bSArne Jansen if (err && !ret) 34675d13a37bSArne Jansen ret = err; 34685d13a37bSArne Jansen } 34695d13a37bSArne Jansen 34705d13a37bSArne Jansen out: 34715d13a37bSArne Jansen kfree(sa); 34725d13a37bSArne Jansen return ret; 34735d13a37bSArne Jansen } 34745d13a37bSArne Jansen 34755d13a37bSArne Jansen static long btrfs_ioctl_qgroup_assign(struct btrfs_root *root, void __user *arg) 34765d13a37bSArne Jansen { 34775d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 34785d13a37bSArne Jansen struct btrfs_trans_handle *trans; 34795d13a37bSArne Jansen int ret; 34805d13a37bSArne Jansen int err; 34815d13a37bSArne Jansen 34825d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 34835d13a37bSArne Jansen return -EPERM; 34845d13a37bSArne Jansen 34855d13a37bSArne Jansen if (root->fs_info->sb->s_flags & MS_RDONLY) 34865d13a37bSArne Jansen return -EROFS; 34875d13a37bSArne Jansen 34885d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 34895d13a37bSArne Jansen if (IS_ERR(sa)) 34905d13a37bSArne Jansen return PTR_ERR(sa); 34915d13a37bSArne Jansen 34925d13a37bSArne Jansen trans = btrfs_join_transaction(root); 34935d13a37bSArne Jansen if (IS_ERR(trans)) { 34945d13a37bSArne Jansen ret = PTR_ERR(trans); 34955d13a37bSArne Jansen goto out; 34965d13a37bSArne Jansen } 34975d13a37bSArne Jansen 34985d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 34995d13a37bSArne Jansen if (sa->assign) { 35005d13a37bSArne Jansen ret = btrfs_add_qgroup_relation(trans, root->fs_info, 35015d13a37bSArne Jansen sa->src, sa->dst); 35025d13a37bSArne Jansen } else { 35035d13a37bSArne Jansen ret = btrfs_del_qgroup_relation(trans, root->fs_info, 35045d13a37bSArne Jansen sa->src, sa->dst); 35055d13a37bSArne Jansen } 35065d13a37bSArne Jansen 35075d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 35085d13a37bSArne Jansen if (err && !ret) 35095d13a37bSArne Jansen ret = err; 35105d13a37bSArne Jansen 35115d13a37bSArne Jansen out: 35125d13a37bSArne Jansen kfree(sa); 35135d13a37bSArne Jansen return ret; 35145d13a37bSArne Jansen } 35155d13a37bSArne Jansen 35165d13a37bSArne Jansen static long btrfs_ioctl_qgroup_create(struct btrfs_root *root, void __user *arg) 35175d13a37bSArne Jansen { 35185d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 35195d13a37bSArne Jansen struct btrfs_trans_handle *trans; 35205d13a37bSArne Jansen int ret; 35215d13a37bSArne Jansen int err; 35225d13a37bSArne Jansen 35235d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 35245d13a37bSArne Jansen return -EPERM; 35255d13a37bSArne Jansen 35265d13a37bSArne Jansen if (root->fs_info->sb->s_flags & MS_RDONLY) 35275d13a37bSArne Jansen return -EROFS; 35285d13a37bSArne Jansen 35295d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 35305d13a37bSArne Jansen if (IS_ERR(sa)) 35315d13a37bSArne Jansen return PTR_ERR(sa); 35325d13a37bSArne Jansen 35335d13a37bSArne Jansen trans = btrfs_join_transaction(root); 35345d13a37bSArne Jansen if (IS_ERR(trans)) { 35355d13a37bSArne Jansen ret = PTR_ERR(trans); 35365d13a37bSArne Jansen goto out; 35375d13a37bSArne Jansen } 35385d13a37bSArne Jansen 35395d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 35405d13a37bSArne Jansen if (sa->create) { 35415d13a37bSArne Jansen ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, 35425d13a37bSArne Jansen NULL); 35435d13a37bSArne Jansen } else { 35445d13a37bSArne Jansen ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); 35455d13a37bSArne Jansen } 35465d13a37bSArne Jansen 35475d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 35485d13a37bSArne Jansen if (err && !ret) 35495d13a37bSArne Jansen ret = err; 35505d13a37bSArne Jansen 35515d13a37bSArne Jansen out: 35525d13a37bSArne Jansen kfree(sa); 35535d13a37bSArne Jansen return ret; 35545d13a37bSArne Jansen } 35555d13a37bSArne Jansen 35565d13a37bSArne Jansen static long btrfs_ioctl_qgroup_limit(struct btrfs_root *root, void __user *arg) 35575d13a37bSArne Jansen { 35585d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 35595d13a37bSArne Jansen struct btrfs_trans_handle *trans; 35605d13a37bSArne Jansen int ret; 35615d13a37bSArne Jansen int err; 35625d13a37bSArne Jansen u64 qgroupid; 35635d13a37bSArne Jansen 35645d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 35655d13a37bSArne Jansen return -EPERM; 35665d13a37bSArne Jansen 35675d13a37bSArne Jansen if (root->fs_info->sb->s_flags & MS_RDONLY) 35685d13a37bSArne Jansen return -EROFS; 35695d13a37bSArne Jansen 35705d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 35715d13a37bSArne Jansen if (IS_ERR(sa)) 35725d13a37bSArne Jansen return PTR_ERR(sa); 35735d13a37bSArne Jansen 35745d13a37bSArne Jansen trans = btrfs_join_transaction(root); 35755d13a37bSArne Jansen if (IS_ERR(trans)) { 35765d13a37bSArne Jansen ret = PTR_ERR(trans); 35775d13a37bSArne Jansen goto out; 35785d13a37bSArne Jansen } 35795d13a37bSArne Jansen 35805d13a37bSArne Jansen qgroupid = sa->qgroupid; 35815d13a37bSArne Jansen if (!qgroupid) { 35825d13a37bSArne Jansen /* take the current subvol as qgroup */ 35835d13a37bSArne Jansen qgroupid = root->root_key.objectid; 35845d13a37bSArne Jansen } 35855d13a37bSArne Jansen 35865d13a37bSArne Jansen /* FIXME: check if the IDs really exist */ 35875d13a37bSArne Jansen ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); 35885d13a37bSArne Jansen 35895d13a37bSArne Jansen err = btrfs_end_transaction(trans, root); 35905d13a37bSArne Jansen if (err && !ret) 35915d13a37bSArne Jansen ret = err; 35925d13a37bSArne Jansen 35935d13a37bSArne Jansen out: 35945d13a37bSArne Jansen kfree(sa); 35955d13a37bSArne Jansen return ret; 35965d13a37bSArne Jansen } 35975d13a37bSArne Jansen 35988ea05e3aSAlexander Block static long btrfs_ioctl_set_received_subvol(struct file *file, 35998ea05e3aSAlexander Block void __user *arg) 36008ea05e3aSAlexander Block { 36018ea05e3aSAlexander Block struct btrfs_ioctl_received_subvol_args *sa = NULL; 36028ea05e3aSAlexander Block struct inode *inode = fdentry(file)->d_inode; 36038ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 36048ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 36058ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 36068ea05e3aSAlexander Block struct timespec ct = CURRENT_TIME; 36078ea05e3aSAlexander Block int ret = 0; 36088ea05e3aSAlexander Block 36098ea05e3aSAlexander Block ret = mnt_want_write_file(file); 36108ea05e3aSAlexander Block if (ret < 0) 36118ea05e3aSAlexander Block return ret; 36128ea05e3aSAlexander Block 36138ea05e3aSAlexander Block down_write(&root->fs_info->subvol_sem); 36148ea05e3aSAlexander Block 36158ea05e3aSAlexander Block if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 36168ea05e3aSAlexander Block ret = -EINVAL; 36178ea05e3aSAlexander Block goto out; 36188ea05e3aSAlexander Block } 36198ea05e3aSAlexander Block 36208ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 36218ea05e3aSAlexander Block ret = -EROFS; 36228ea05e3aSAlexander Block goto out; 36238ea05e3aSAlexander Block } 36248ea05e3aSAlexander Block 36258ea05e3aSAlexander Block if (!inode_owner_or_capable(inode)) { 36268ea05e3aSAlexander Block ret = -EACCES; 36278ea05e3aSAlexander Block goto out; 36288ea05e3aSAlexander Block } 36298ea05e3aSAlexander Block 36308ea05e3aSAlexander Block sa = memdup_user(arg, sizeof(*sa)); 36318ea05e3aSAlexander Block if (IS_ERR(sa)) { 36328ea05e3aSAlexander Block ret = PTR_ERR(sa); 36338ea05e3aSAlexander Block sa = NULL; 36348ea05e3aSAlexander Block goto out; 36358ea05e3aSAlexander Block } 36368ea05e3aSAlexander Block 36378ea05e3aSAlexander Block trans = btrfs_start_transaction(root, 1); 36388ea05e3aSAlexander Block if (IS_ERR(trans)) { 36398ea05e3aSAlexander Block ret = PTR_ERR(trans); 36408ea05e3aSAlexander Block trans = NULL; 36418ea05e3aSAlexander Block goto out; 36428ea05e3aSAlexander Block } 36438ea05e3aSAlexander Block 36448ea05e3aSAlexander Block sa->rtransid = trans->transid; 36458ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 36468ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 36478ea05e3aSAlexander Block 36488ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 36498ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 36508ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 36518ea05e3aSAlexander Block root_item->stime.sec = cpu_to_le64(sa->stime.sec); 36528ea05e3aSAlexander Block root_item->stime.nsec = cpu_to_le32(sa->stime.nsec); 36538ea05e3aSAlexander Block root_item->rtime.sec = cpu_to_le64(sa->rtime.sec); 36548ea05e3aSAlexander Block root_item->rtime.nsec = cpu_to_le32(sa->rtime.nsec); 36558ea05e3aSAlexander Block 36568ea05e3aSAlexander Block ret = btrfs_update_root(trans, root->fs_info->tree_root, 36578ea05e3aSAlexander Block &root->root_key, &root->root_item); 36588ea05e3aSAlexander Block if (ret < 0) { 36598ea05e3aSAlexander Block btrfs_end_transaction(trans, root); 36608ea05e3aSAlexander Block trans = NULL; 36618ea05e3aSAlexander Block goto out; 36628ea05e3aSAlexander Block } else { 36638ea05e3aSAlexander Block ret = btrfs_commit_transaction(trans, root); 36648ea05e3aSAlexander Block if (ret < 0) 36658ea05e3aSAlexander Block goto out; 36668ea05e3aSAlexander Block } 36678ea05e3aSAlexander Block 36688ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 36698ea05e3aSAlexander Block if (ret) 36708ea05e3aSAlexander Block ret = -EFAULT; 36718ea05e3aSAlexander Block 36728ea05e3aSAlexander Block out: 36738ea05e3aSAlexander Block kfree(sa); 36748ea05e3aSAlexander Block up_write(&root->fs_info->subvol_sem); 36758ea05e3aSAlexander Block mnt_drop_write_file(file); 36768ea05e3aSAlexander Block return ret; 36778ea05e3aSAlexander Block } 36788ea05e3aSAlexander Block 3679f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 3680f46b5a66SChristoph Hellwig cmd, unsigned long arg) 3681f46b5a66SChristoph Hellwig { 3682f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 36834bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 3684f46b5a66SChristoph Hellwig 3685f46b5a66SChristoph Hellwig switch (cmd) { 36866cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 36876cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 36886cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 36896cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 36906cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 36916cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 3692f7039b1dSLi Dongyang case FITRIM: 3693f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 3694f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 3695fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 3696fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 3697fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 36983de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 3699fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 37006f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 37016f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 370276dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 370376dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 37040caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 37050caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 37060caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 37070caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 37086ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 37096ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 3710f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 37111e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 37121e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 37131e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 3714f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 37154bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 3716f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 37174bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 3718f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 37194bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 3720475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 3721475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 3722475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 3723475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 3724f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 37259ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 3726f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 3727c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 3728c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 37297a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 3730f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 3731f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 3732f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 3733f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 3734ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 3735ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 3736ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 3737ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 3738d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 3739d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 3740d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 3741d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 37421406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 37431406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 3744f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 3745f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 3746f46b5a66SChristoph Hellwig return 0; 374746204592SSage Weil case BTRFS_IOC_START_SYNC: 374846204592SSage Weil return btrfs_ioctl_start_sync(file, argp); 374946204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 375046204592SSage Weil return btrfs_ioctl_wait_sync(file, argp); 3751475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 3752475f6387SJan Schmidt return btrfs_ioctl_scrub(root, argp); 3753475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 3754475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 3755475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 3756475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 3757c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 37589ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 3759837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 3760837d5b6eSIlya Dryomov return btrfs_ioctl_balance_ctl(root, arg); 376119a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 376219a39dceSIlya Dryomov return btrfs_ioctl_balance_progress(root, argp); 37638ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 37648ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 376531db9f7cSAlexander Block case BTRFS_IOC_SEND: 376631db9f7cSAlexander Block return btrfs_ioctl_send(file, argp); 3767c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 3768b27f7c0cSDavid Sterba return btrfs_ioctl_get_dev_stats(root, argp); 37695d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 37705d13a37bSArne Jansen return btrfs_ioctl_quota_ctl(root, argp); 37715d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 37725d13a37bSArne Jansen return btrfs_ioctl_qgroup_assign(root, argp); 37735d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 37745d13a37bSArne Jansen return btrfs_ioctl_qgroup_create(root, argp); 37755d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 37765d13a37bSArne Jansen return btrfs_ioctl_qgroup_limit(root, argp); 3777f46b5a66SChristoph Hellwig } 3778f46b5a66SChristoph Hellwig 3779f46b5a66SChristoph Hellwig return -ENOTTY; 3780f46b5a66SChristoph Hellwig } 3781