1f46b5a66SChristoph Hellwig /* 2f46b5a66SChristoph Hellwig * Copyright (C) 2007 Oracle. All rights reserved. 3f46b5a66SChristoph Hellwig * 4f46b5a66SChristoph Hellwig * This program is free software; you can redistribute it and/or 5f46b5a66SChristoph Hellwig * modify it under the terms of the GNU General Public 6f46b5a66SChristoph Hellwig * License v2 as published by the Free Software Foundation. 7f46b5a66SChristoph Hellwig * 8f46b5a66SChristoph Hellwig * This program is distributed in the hope that it will be useful, 9f46b5a66SChristoph Hellwig * but WITHOUT ANY WARRANTY; without even the implied warranty of 10f46b5a66SChristoph Hellwig * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11f46b5a66SChristoph Hellwig * General Public License for more details. 12f46b5a66SChristoph Hellwig * 13f46b5a66SChristoph Hellwig * You should have received a copy of the GNU General Public 14f46b5a66SChristoph Hellwig * License along with this program; if not, write to the 15f46b5a66SChristoph Hellwig * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16f46b5a66SChristoph Hellwig * Boston, MA 021110-1307, USA. 17f46b5a66SChristoph Hellwig */ 18f46b5a66SChristoph Hellwig 19f46b5a66SChristoph Hellwig #include <linux/kernel.h> 20f46b5a66SChristoph Hellwig #include <linux/bio.h> 21f46b5a66SChristoph Hellwig #include <linux/buffer_head.h> 22f46b5a66SChristoph Hellwig #include <linux/file.h> 23f46b5a66SChristoph Hellwig #include <linux/fs.h> 24cb8e7090SChristoph Hellwig #include <linux/fsnotify.h> 25f46b5a66SChristoph Hellwig #include <linux/pagemap.h> 26f46b5a66SChristoph Hellwig #include <linux/highmem.h> 27f46b5a66SChristoph Hellwig #include <linux/time.h> 28f46b5a66SChristoph Hellwig #include <linux/init.h> 29f46b5a66SChristoph Hellwig #include <linux/string.h> 30f46b5a66SChristoph Hellwig #include <linux/backing-dev.h> 31cb8e7090SChristoph Hellwig #include <linux/mount.h> 32f46b5a66SChristoph Hellwig #include <linux/mpage.h> 33cb8e7090SChristoph Hellwig #include <linux/namei.h> 34f46b5a66SChristoph Hellwig #include <linux/swap.h> 35f46b5a66SChristoph Hellwig #include <linux/writeback.h> 36f46b5a66SChristoph Hellwig #include <linux/statfs.h> 37f46b5a66SChristoph Hellwig #include <linux/compat.h> 38f46b5a66SChristoph Hellwig #include <linux/bit_spinlock.h> 39cb8e7090SChristoph Hellwig #include <linux/security.h> 40f46b5a66SChristoph Hellwig #include <linux/xattr.h> 417ea394f1SYan Zheng #include <linux/vmalloc.h> 425a0e3ad6STejun Heo #include <linux/slab.h> 43f7039b1dSLi Dongyang #include <linux/blkdev.h> 444b4e25f2SChris Mason #include "compat.h" 45f46b5a66SChristoph Hellwig #include "ctree.h" 46f46b5a66SChristoph Hellwig #include "disk-io.h" 47f46b5a66SChristoph Hellwig #include "transaction.h" 48f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 49f46b5a66SChristoph Hellwig #include "ioctl.h" 50f46b5a66SChristoph Hellwig #include "print-tree.h" 51f46b5a66SChristoph Hellwig #include "volumes.h" 52925baeddSChris Mason #include "locking.h" 53581bb050SLi Zefan #include "inode-map.h" 54d7728c96SJan Schmidt #include "backref.h" 55f46b5a66SChristoph Hellwig 566cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 576cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 586cbff00fSChristoph Hellwig { 596cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 606cbff00fSChristoph Hellwig return flags; 616cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 626cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 636cbff00fSChristoph Hellwig else 646cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 656cbff00fSChristoph Hellwig } 66f46b5a66SChristoph Hellwig 676cbff00fSChristoph Hellwig /* 686cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 696cbff00fSChristoph Hellwig */ 706cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 716cbff00fSChristoph Hellwig { 726cbff00fSChristoph Hellwig unsigned int iflags = 0; 736cbff00fSChristoph Hellwig 746cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 756cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 766cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 776cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 786cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 796cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 806cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 816cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 826cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 836cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 846cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 856cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 86d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 87d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 88d0092bddSLi Zefan 89d0092bddSLi Zefan if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) 90d0092bddSLi Zefan iflags |= FS_COMPR_FL; 91d0092bddSLi Zefan else if (flags & BTRFS_INODE_NOCOMPRESS) 92d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 936cbff00fSChristoph Hellwig 946cbff00fSChristoph Hellwig return iflags; 956cbff00fSChristoph Hellwig } 966cbff00fSChristoph Hellwig 976cbff00fSChristoph Hellwig /* 986cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 996cbff00fSChristoph Hellwig */ 1006cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 1016cbff00fSChristoph Hellwig { 1026cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1036cbff00fSChristoph Hellwig 1046cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 1056cbff00fSChristoph Hellwig 1066cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 1076cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 1086cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1096cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1106cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1116cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1126cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1136cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1146cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1156cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1166cbff00fSChristoph Hellwig } 1176cbff00fSChristoph Hellwig 1186cbff00fSChristoph Hellwig /* 1196cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1206cbff00fSChristoph Hellwig * 1216cbff00fSChristoph Hellwig * Unlike extN we don't have any flags we don't want to inherit currently. 1226cbff00fSChristoph Hellwig */ 1236cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1246cbff00fSChristoph Hellwig { 1250b4dcea5SChris Mason unsigned int flags; 1260b4dcea5SChris Mason 1270b4dcea5SChris Mason if (!dir) 1280b4dcea5SChris Mason return; 1290b4dcea5SChris Mason 1300b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1316cbff00fSChristoph Hellwig 1326cbff00fSChristoph Hellwig if (S_ISREG(inode->i_mode)) 1336cbff00fSChristoph Hellwig flags &= ~BTRFS_INODE_DIRSYNC; 1346cbff00fSChristoph Hellwig else if (!S_ISDIR(inode->i_mode)) 1356cbff00fSChristoph Hellwig flags &= (BTRFS_INODE_NODUMP | BTRFS_INODE_NOATIME); 1366cbff00fSChristoph Hellwig 1376cbff00fSChristoph Hellwig BTRFS_I(inode)->flags = flags; 1386cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1396cbff00fSChristoph Hellwig } 1406cbff00fSChristoph Hellwig 1416cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1426cbff00fSChristoph Hellwig { 1436cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); 1446cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1456cbff00fSChristoph Hellwig 1466cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1476cbff00fSChristoph Hellwig return -EFAULT; 1486cbff00fSChristoph Hellwig return 0; 1496cbff00fSChristoph Hellwig } 1506cbff00fSChristoph Hellwig 15175e7cb7fSLiu Bo static int check_flags(unsigned int flags) 15275e7cb7fSLiu Bo { 15375e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 15475e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 15575e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 156e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 157e1e8fb6aSLi Zefan FS_NOCOW_FL)) 15875e7cb7fSLiu Bo return -EOPNOTSUPP; 15975e7cb7fSLiu Bo 16075e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 16175e7cb7fSLiu Bo return -EINVAL; 16275e7cb7fSLiu Bo 16375e7cb7fSLiu Bo return 0; 16475e7cb7fSLiu Bo } 16575e7cb7fSLiu Bo 1666cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1676cbff00fSChristoph Hellwig { 1686cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 1696cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1706cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1716cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1726cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1736cbff00fSChristoph Hellwig int ret; 1746cbff00fSChristoph Hellwig 175b83cc969SLi Zefan if (btrfs_root_readonly(root)) 176b83cc969SLi Zefan return -EROFS; 177b83cc969SLi Zefan 1786cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1796cbff00fSChristoph Hellwig return -EFAULT; 1806cbff00fSChristoph Hellwig 18175e7cb7fSLiu Bo ret = check_flags(flags); 18275e7cb7fSLiu Bo if (ret) 18375e7cb7fSLiu Bo return ret; 1846cbff00fSChristoph Hellwig 1852e149670SSerge E. Hallyn if (!inode_owner_or_capable(inode)) 1866cbff00fSChristoph Hellwig return -EACCES; 1876cbff00fSChristoph Hellwig 1886cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 1896cbff00fSChristoph Hellwig 1906cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 1916cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 1926cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 1936cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 1946cbff00fSChristoph Hellwig ret = -EPERM; 1956cbff00fSChristoph Hellwig goto out_unlock; 1966cbff00fSChristoph Hellwig } 1976cbff00fSChristoph Hellwig } 1986cbff00fSChristoph Hellwig 1996cbff00fSChristoph Hellwig ret = mnt_want_write(file->f_path.mnt); 2006cbff00fSChristoph Hellwig if (ret) 2016cbff00fSChristoph Hellwig goto out_unlock; 2026cbff00fSChristoph Hellwig 2036cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 2046cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 2056cbff00fSChristoph Hellwig else 2066cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2076cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2086cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2096cbff00fSChristoph Hellwig else 2106cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2116cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2126cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2136cbff00fSChristoph Hellwig else 2146cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2156cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2166cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2176cbff00fSChristoph Hellwig else 2186cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2196cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2206cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2216cbff00fSChristoph Hellwig else 2226cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2236cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2246cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2256cbff00fSChristoph Hellwig else 2266cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 227e1e8fb6aSLi Zefan if (flags & FS_NOCOW_FL) 228e1e8fb6aSLi Zefan ip->flags |= BTRFS_INODE_NODATACOW; 229e1e8fb6aSLi Zefan else 230e1e8fb6aSLi Zefan ip->flags &= ~BTRFS_INODE_NODATACOW; 2316cbff00fSChristoph Hellwig 23275e7cb7fSLiu Bo /* 23375e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 23475e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 23575e7cb7fSLiu Bo * things smaller. 23675e7cb7fSLiu Bo */ 23775e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 23875e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 23975e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 24075e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 24175e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 24275e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 243ebcb904dSLi Zefan } else { 244ebcb904dSLi Zefan ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 24575e7cb7fSLiu Bo } 2466cbff00fSChristoph Hellwig 2477a7eaa40SJosef Bacik trans = btrfs_join_transaction(root); 2483612b495STsutomu Itoh BUG_ON(IS_ERR(trans)); 2496cbff00fSChristoph Hellwig 2506cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 2516cbff00fSChristoph Hellwig BUG_ON(ret); 2526cbff00fSChristoph Hellwig 2536cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 2546cbff00fSChristoph Hellwig inode->i_ctime = CURRENT_TIME; 2556cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 2566cbff00fSChristoph Hellwig 2576cbff00fSChristoph Hellwig mnt_drop_write(file->f_path.mnt); 2582d4e6f6aSliubo 2592d4e6f6aSliubo ret = 0; 2606cbff00fSChristoph Hellwig out_unlock: 2616cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 2622d4e6f6aSliubo return ret; 2636cbff00fSChristoph Hellwig } 2646cbff00fSChristoph Hellwig 2656cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 2666cbff00fSChristoph Hellwig { 2676cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 2686cbff00fSChristoph Hellwig 2696cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 2706cbff00fSChristoph Hellwig } 271f46b5a66SChristoph Hellwig 272f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 273f7039b1dSLi Dongyang { 274f7039b1dSLi Dongyang struct btrfs_root *root = fdentry(file)->d_sb->s_fs_info; 275f7039b1dSLi Dongyang struct btrfs_fs_info *fs_info = root->fs_info; 276f7039b1dSLi Dongyang struct btrfs_device *device; 277f7039b1dSLi Dongyang struct request_queue *q; 278f7039b1dSLi Dongyang struct fstrim_range range; 279f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 280f7039b1dSLi Dongyang u64 num_devices = 0; 281f7039b1dSLi Dongyang int ret; 282f7039b1dSLi Dongyang 283f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 284f7039b1dSLi Dongyang return -EPERM; 285f7039b1dSLi Dongyang 2861f78160cSXiao Guangrong rcu_read_lock(); 2871f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 2881f78160cSXiao Guangrong dev_list) { 289f7039b1dSLi Dongyang if (!device->bdev) 290f7039b1dSLi Dongyang continue; 291f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 292f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 293f7039b1dSLi Dongyang num_devices++; 294f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 295f7039b1dSLi Dongyang minlen); 296f7039b1dSLi Dongyang } 297f7039b1dSLi Dongyang } 2981f78160cSXiao Guangrong rcu_read_unlock(); 299f7039b1dSLi Dongyang if (!num_devices) 300f7039b1dSLi Dongyang return -EOPNOTSUPP; 301f7039b1dSLi Dongyang 302f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 303f7039b1dSLi Dongyang return -EFAULT; 304f7039b1dSLi Dongyang 305f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 306f7039b1dSLi Dongyang ret = btrfs_trim_fs(root, &range); 307f7039b1dSLi Dongyang if (ret < 0) 308f7039b1dSLi Dongyang return ret; 309f7039b1dSLi Dongyang 310f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 311f7039b1dSLi Dongyang return -EFAULT; 312f7039b1dSLi Dongyang 313f7039b1dSLi Dongyang return 0; 314f7039b1dSLi Dongyang } 315f7039b1dSLi Dongyang 316cb8e7090SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, 317cb8e7090SChristoph Hellwig struct dentry *dentry, 31872fd032eSSage Weil char *name, int namelen, 31972fd032eSSage Weil u64 *async_transid) 320f46b5a66SChristoph Hellwig { 321f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 322f46b5a66SChristoph Hellwig struct btrfs_key key; 323f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 324f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 325f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 32676dda93cSYan, Zheng struct btrfs_root *new_root; 3272fbe8c8aSAl Viro struct dentry *parent = dentry->d_parent; 3286a912213SJosef Bacik struct inode *dir; 329f46b5a66SChristoph Hellwig int ret; 330f46b5a66SChristoph Hellwig int err; 331f46b5a66SChristoph Hellwig u64 objectid; 332f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 3333de4586cSChris Mason u64 index = 0; 334f46b5a66SChristoph Hellwig 335581bb050SLi Zefan ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); 3362fbe8c8aSAl Viro if (ret) 337a22285a6SYan, Zheng return ret; 3386a912213SJosef Bacik 3396a912213SJosef Bacik dir = parent->d_inode; 3406a912213SJosef Bacik 3419ed74f2dSJosef Bacik /* 3429ed74f2dSJosef Bacik * 1 - inode item 3439ed74f2dSJosef Bacik * 2 - refs 3449ed74f2dSJosef Bacik * 1 - root item 3459ed74f2dSJosef Bacik * 2 - dir items 3469ed74f2dSJosef Bacik */ 347a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 6); 3482fbe8c8aSAl Viro if (IS_ERR(trans)) 349a22285a6SYan, Zheng return PTR_ERR(trans); 350f46b5a66SChristoph Hellwig 3515d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 3525d4f98a2SYan Zheng 0, objectid, NULL, 0, 0, 0); 3538e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 3548e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 3558e8a1e31SJosef Bacik goto fail; 3568e8a1e31SJosef Bacik } 357f46b5a66SChristoph Hellwig 3585d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 359f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 360f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 3615d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 362f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 363f46b5a66SChristoph Hellwig 364f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 365f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 366f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 3675d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 3685d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 3695d4f98a2SYan Zheng BTRFS_UUID_SIZE); 370f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 371f46b5a66SChristoph Hellwig 372f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 373f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 374f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 375f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 376f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 377a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 378f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 379f46b5a66SChristoph Hellwig 38008fe4db1SLi Zefan root_item.flags = 0; 38108fe4db1SLi Zefan root_item.byte_limit = 0; 38208fe4db1SLi Zefan inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT); 38308fe4db1SLi Zefan 384f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 38584234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 386f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 387f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 38886b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 38980ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 390f46b5a66SChristoph Hellwig 391f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 392f46b5a66SChristoph Hellwig root_item.drop_level = 0; 393f46b5a66SChristoph Hellwig 394925baeddSChris Mason btrfs_tree_unlock(leaf); 395f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 396f46b5a66SChristoph Hellwig leaf = NULL; 397f46b5a66SChristoph Hellwig 398f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 399f46b5a66SChristoph Hellwig 400f46b5a66SChristoph Hellwig key.objectid = objectid; 4015d4f98a2SYan Zheng key.offset = 0; 402f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 403f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 404f46b5a66SChristoph Hellwig &root_item); 405f46b5a66SChristoph Hellwig if (ret) 406f46b5a66SChristoph Hellwig goto fail; 407f46b5a66SChristoph Hellwig 40876dda93cSYan, Zheng key.offset = (u64)-1; 40976dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 41076dda93cSYan, Zheng BUG_ON(IS_ERR(new_root)); 41176dda93cSYan, Zheng 41276dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 41376dda93cSYan, Zheng 414d82a6f1dSJosef Bacik ret = btrfs_create_subvol_root(trans, new_root, new_dirid); 415f46b5a66SChristoph Hellwig /* 416f46b5a66SChristoph Hellwig * insert the directory item 417f46b5a66SChristoph Hellwig */ 4183de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 4193de4586cSChris Mason BUG_ON(ret); 4203de4586cSChris Mason 4213de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 42216cdcec7SMiao Xie name, namelen, dir, &key, 4233de4586cSChris Mason BTRFS_FT_DIR, index); 424f46b5a66SChristoph Hellwig if (ret) 425f46b5a66SChristoph Hellwig goto fail; 4260660b5afSChris Mason 42752c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 42852c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 42952c26179SYan Zheng BUG_ON(ret); 43052c26179SYan Zheng 4310660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 4324df27c4dSYan, Zheng objectid, root->root_key.objectid, 43333345d01SLi Zefan btrfs_ino(dir), index, name, namelen); 43476dda93cSYan, Zheng 4350660b5afSChris Mason BUG_ON(ret); 4360660b5afSChris Mason 43776dda93cSYan, Zheng d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 438f46b5a66SChristoph Hellwig fail: 43972fd032eSSage Weil if (async_transid) { 44072fd032eSSage Weil *async_transid = trans->transid; 44172fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 44272fd032eSSage Weil } else { 44376dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 44472fd032eSSage Weil } 445f46b5a66SChristoph Hellwig if (err && !ret) 446f46b5a66SChristoph Hellwig ret = err; 447f46b5a66SChristoph Hellwig return ret; 448f46b5a66SChristoph Hellwig } 449f46b5a66SChristoph Hellwig 45072fd032eSSage Weil static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 451b83cc969SLi Zefan char *name, int namelen, u64 *async_transid, 452b83cc969SLi Zefan bool readonly) 453f46b5a66SChristoph Hellwig { 4542e4bfab9SYan, Zheng struct inode *inode; 455f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 456f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 4572e4bfab9SYan, Zheng int ret; 458f46b5a66SChristoph Hellwig 459f46b5a66SChristoph Hellwig if (!root->ref_cows) 460f46b5a66SChristoph Hellwig return -EINVAL; 461f46b5a66SChristoph Hellwig 462a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 463a22285a6SYan, Zheng if (!pending_snapshot) 464a22285a6SYan, Zheng return -ENOMEM; 465a22285a6SYan, Zheng 466a22285a6SYan, Zheng btrfs_init_block_rsv(&pending_snapshot->block_rsv); 467a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 468a22285a6SYan, Zheng pending_snapshot->root = root; 469b83cc969SLi Zefan pending_snapshot->readonly = readonly; 470a22285a6SYan, Zheng 471a22285a6SYan, Zheng trans = btrfs_start_transaction(root->fs_info->extent_root, 5); 472a22285a6SYan, Zheng if (IS_ERR(trans)) { 473a22285a6SYan, Zheng ret = PTR_ERR(trans); 474a22285a6SYan, Zheng goto fail; 475a22285a6SYan, Zheng } 476a22285a6SYan, Zheng 477a22285a6SYan, Zheng ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); 478a22285a6SYan, Zheng BUG_ON(ret); 479a22285a6SYan, Zheng 4808351583eSJosef Bacik spin_lock(&root->fs_info->trans_lock); 481a22285a6SYan, Zheng list_add(&pending_snapshot->list, 482a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 4838351583eSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 48472fd032eSSage Weil if (async_transid) { 48572fd032eSSage Weil *async_transid = trans->transid; 48672fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 48772fd032eSSage Weil root->fs_info->extent_root, 1); 48872fd032eSSage Weil } else { 48972fd032eSSage Weil ret = btrfs_commit_transaction(trans, 49072fd032eSSage Weil root->fs_info->extent_root); 49172fd032eSSage Weil } 492a22285a6SYan, Zheng BUG_ON(ret); 493a22285a6SYan, Zheng 494a22285a6SYan, Zheng ret = pending_snapshot->error; 495f46b5a66SChristoph Hellwig if (ret) 4962e4bfab9SYan, Zheng goto fail; 497f46b5a66SChristoph Hellwig 49866b4ffd1SJosef Bacik ret = btrfs_orphan_cleanup(pending_snapshot->snap); 49966b4ffd1SJosef Bacik if (ret) 50066b4ffd1SJosef Bacik goto fail; 501f46b5a66SChristoph Hellwig 5022fbe8c8aSAl Viro inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 5032e4bfab9SYan, Zheng if (IS_ERR(inode)) { 5042e4bfab9SYan, Zheng ret = PTR_ERR(inode); 5052e4bfab9SYan, Zheng goto fail; 5062e4bfab9SYan, Zheng } 5072e4bfab9SYan, Zheng BUG_ON(!inode); 5082e4bfab9SYan, Zheng d_instantiate(dentry, inode); 5092e4bfab9SYan, Zheng ret = 0; 5102e4bfab9SYan, Zheng fail: 511a22285a6SYan, Zheng kfree(pending_snapshot); 512f46b5a66SChristoph Hellwig return ret; 513f46b5a66SChristoph Hellwig } 514f46b5a66SChristoph Hellwig 5154260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 5164260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 5174260f7c7SSage Weil * minimal. 5184260f7c7SSage Weil */ 5194260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 5204260f7c7SSage Weil { 5214260f7c7SSage Weil uid_t fsuid = current_fsuid(); 5224260f7c7SSage Weil 5234260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 5244260f7c7SSage Weil return 0; 5254260f7c7SSage Weil if (inode->i_uid == fsuid) 5264260f7c7SSage Weil return 0; 5274260f7c7SSage Weil if (dir->i_uid == fsuid) 5284260f7c7SSage Weil return 0; 5294260f7c7SSage Weil return !capable(CAP_FOWNER); 5304260f7c7SSage Weil } 5314260f7c7SSage Weil 5324260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 5334260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 5344260f7c7SSage Weil * whether the type of victim is right. 5354260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 5364260f7c7SSage Weil * 2. We should have write and exec permissions on dir 5374260f7c7SSage Weil * 3. We can't remove anything from append-only dir 5384260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 5394260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 5404260f7c7SSage Weil * a. be owner of dir, or 5414260f7c7SSage Weil * b. be owner of victim, or 5424260f7c7SSage Weil * c. have CAP_FOWNER capability 5434260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 5444260f7c7SSage Weil * links pointing to it. 5454260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 5464260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 5474260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 5484260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 5494260f7c7SSage Weil * nfs_async_unlink(). 5504260f7c7SSage Weil */ 5514260f7c7SSage Weil 5524260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) 5534260f7c7SSage Weil { 5544260f7c7SSage Weil int error; 5554260f7c7SSage Weil 5564260f7c7SSage Weil if (!victim->d_inode) 5574260f7c7SSage Weil return -ENOENT; 5584260f7c7SSage Weil 5594260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 5604260f7c7SSage Weil audit_inode_child(victim, dir); 5614260f7c7SSage Weil 5624260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 5634260f7c7SSage Weil if (error) 5644260f7c7SSage Weil return error; 5654260f7c7SSage Weil if (IS_APPEND(dir)) 5664260f7c7SSage Weil return -EPERM; 5674260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 5684260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 5694260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 5704260f7c7SSage Weil return -EPERM; 5714260f7c7SSage Weil if (isdir) { 5724260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 5734260f7c7SSage Weil return -ENOTDIR; 5744260f7c7SSage Weil if (IS_ROOT(victim)) 5754260f7c7SSage Weil return -EBUSY; 5764260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 5774260f7c7SSage Weil return -EISDIR; 5784260f7c7SSage Weil if (IS_DEADDIR(dir)) 5794260f7c7SSage Weil return -ENOENT; 5804260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 5814260f7c7SSage Weil return -EBUSY; 5824260f7c7SSage Weil return 0; 5834260f7c7SSage Weil } 5844260f7c7SSage Weil 585cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 586cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 587cb8e7090SChristoph Hellwig { 588cb8e7090SChristoph Hellwig if (child->d_inode) 589cb8e7090SChristoph Hellwig return -EEXIST; 590cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 591cb8e7090SChristoph Hellwig return -ENOENT; 592cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 593cb8e7090SChristoph Hellwig } 594cb8e7090SChristoph Hellwig 595cb8e7090SChristoph Hellwig /* 596cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 597cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 598cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 599cb8e7090SChristoph Hellwig */ 60076dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 60176dda93cSYan, Zheng char *name, int namelen, 60272fd032eSSage Weil struct btrfs_root *snap_src, 603b83cc969SLi Zefan u64 *async_transid, bool readonly) 604cb8e7090SChristoph Hellwig { 60576dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 606cb8e7090SChristoph Hellwig struct dentry *dentry; 607cb8e7090SChristoph Hellwig int error; 608cb8e7090SChristoph Hellwig 60976dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 610cb8e7090SChristoph Hellwig 611cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 612cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 613cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 614cb8e7090SChristoph Hellwig goto out_unlock; 615cb8e7090SChristoph Hellwig 616cb8e7090SChristoph Hellwig error = -EEXIST; 617cb8e7090SChristoph Hellwig if (dentry->d_inode) 618cb8e7090SChristoph Hellwig goto out_dput; 619cb8e7090SChristoph Hellwig 620cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 621cb8e7090SChristoph Hellwig if (error) 622cb8e7090SChristoph Hellwig goto out_dput; 623cb8e7090SChristoph Hellwig 62476dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 625cb8e7090SChristoph Hellwig if (error) 626cb8e7090SChristoph Hellwig goto out_drop_write; 627cb8e7090SChristoph Hellwig 62876dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 62976dda93cSYan, Zheng 63076dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 63176dda93cSYan, Zheng goto out_up_read; 63276dda93cSYan, Zheng 6333de4586cSChris Mason if (snap_src) { 63472fd032eSSage Weil error = create_snapshot(snap_src, dentry, 635b83cc969SLi Zefan name, namelen, async_transid, readonly); 6363de4586cSChris Mason } else { 63776dda93cSYan, Zheng error = create_subvol(BTRFS_I(dir)->root, dentry, 63872fd032eSSage Weil name, namelen, async_transid); 6393de4586cSChris Mason } 64076dda93cSYan, Zheng if (!error) 64176dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 64276dda93cSYan, Zheng out_up_read: 64376dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 644cb8e7090SChristoph Hellwig out_drop_write: 645cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 646cb8e7090SChristoph Hellwig out_dput: 647cb8e7090SChristoph Hellwig dput(dentry); 648cb8e7090SChristoph Hellwig out_unlock: 64976dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 650cb8e7090SChristoph Hellwig return error; 651cb8e7090SChristoph Hellwig } 652cb8e7090SChristoph Hellwig 6534cb5300bSChris Mason /* 6544cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 6554cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 6564cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 6574cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 6584cb5300bSChris Mason * part of the file 6594cb5300bSChris Mason */ 6604cb5300bSChris Mason static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) 6614cb5300bSChris Mason { 6624cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 6634cb5300bSChris Mason struct extent_map *em = NULL; 6644cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 6654cb5300bSChris Mason u64 end; 6664cb5300bSChris Mason 6674cb5300bSChris Mason read_lock(&em_tree->lock); 6684cb5300bSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 6694cb5300bSChris Mason read_unlock(&em_tree->lock); 6704cb5300bSChris Mason 6714cb5300bSChris Mason if (em) { 6724cb5300bSChris Mason end = extent_map_end(em); 6734cb5300bSChris Mason free_extent_map(em); 6744cb5300bSChris Mason if (end - offset > thresh) 6754cb5300bSChris Mason return 0; 6764cb5300bSChris Mason } 6774cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 6784cb5300bSChris Mason thresh /= 2; 6794cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 6804cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 6814cb5300bSChris Mason if (end >= thresh) 6824cb5300bSChris Mason return 0; 6834cb5300bSChris Mason return 1; 6844cb5300bSChris Mason } 6854cb5300bSChris Mason 6864cb5300bSChris Mason /* 6874cb5300bSChris Mason * helper function to walk through a file and find extents 6884cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 6894cb5300bSChris Mason * 6904cb5300bSChris Mason * This is used by the defragging code to find new and small 6914cb5300bSChris Mason * extents 6924cb5300bSChris Mason */ 6934cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 6944cb5300bSChris Mason struct inode *inode, u64 newer_than, 6954cb5300bSChris Mason u64 *off, int thresh) 6964cb5300bSChris Mason { 6974cb5300bSChris Mason struct btrfs_path *path; 6984cb5300bSChris Mason struct btrfs_key min_key; 6994cb5300bSChris Mason struct btrfs_key max_key; 7004cb5300bSChris Mason struct extent_buffer *leaf; 7014cb5300bSChris Mason struct btrfs_file_extent_item *extent; 7024cb5300bSChris Mason int type; 7034cb5300bSChris Mason int ret; 704a4689d2bSDavid Sterba u64 ino = btrfs_ino(inode); 7054cb5300bSChris Mason 7064cb5300bSChris Mason path = btrfs_alloc_path(); 7074cb5300bSChris Mason if (!path) 7084cb5300bSChris Mason return -ENOMEM; 7094cb5300bSChris Mason 710a4689d2bSDavid Sterba min_key.objectid = ino; 7114cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 7124cb5300bSChris Mason min_key.offset = *off; 7134cb5300bSChris Mason 714a4689d2bSDavid Sterba max_key.objectid = ino; 7154cb5300bSChris Mason max_key.type = (u8)-1; 7164cb5300bSChris Mason max_key.offset = (u64)-1; 7174cb5300bSChris Mason 7184cb5300bSChris Mason path->keep_locks = 1; 7194cb5300bSChris Mason 7204cb5300bSChris Mason while(1) { 7214cb5300bSChris Mason ret = btrfs_search_forward(root, &min_key, &max_key, 7224cb5300bSChris Mason path, 0, newer_than); 7234cb5300bSChris Mason if (ret != 0) 7244cb5300bSChris Mason goto none; 725a4689d2bSDavid Sterba if (min_key.objectid != ino) 7264cb5300bSChris Mason goto none; 7274cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 7284cb5300bSChris Mason goto none; 7294cb5300bSChris Mason 7304cb5300bSChris Mason leaf = path->nodes[0]; 7314cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 7324cb5300bSChris Mason struct btrfs_file_extent_item); 7334cb5300bSChris Mason 7344cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 7354cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 7364cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 7374cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 7384cb5300bSChris Mason *off = min_key.offset; 7394cb5300bSChris Mason btrfs_free_path(path); 7404cb5300bSChris Mason return 0; 7414cb5300bSChris Mason } 7424cb5300bSChris Mason 7434cb5300bSChris Mason if (min_key.offset == (u64)-1) 7444cb5300bSChris Mason goto none; 7454cb5300bSChris Mason 7464cb5300bSChris Mason min_key.offset++; 7474cb5300bSChris Mason btrfs_release_path(path); 7484cb5300bSChris Mason } 7494cb5300bSChris Mason none: 7504cb5300bSChris Mason btrfs_free_path(path); 7514cb5300bSChris Mason return -ENOENT; 7524cb5300bSChris Mason } 7534cb5300bSChris Mason 754940100a4SChris Mason static int should_defrag_range(struct inode *inode, u64 start, u64 len, 7551e701a32SChris Mason int thresh, u64 *last_len, u64 *skip, 7561e701a32SChris Mason u64 *defrag_end) 757940100a4SChris Mason { 758940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 759940100a4SChris Mason struct extent_map *em = NULL; 760940100a4SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 761940100a4SChris Mason int ret = 1; 762940100a4SChris Mason 763940100a4SChris Mason /* 764940100a4SChris Mason * make sure that once we start defragging and extent, we keep on 765940100a4SChris Mason * defragging it 766940100a4SChris Mason */ 767940100a4SChris Mason if (start < *defrag_end) 768940100a4SChris Mason return 1; 769940100a4SChris Mason 770940100a4SChris Mason *skip = 0; 771940100a4SChris Mason 772940100a4SChris Mason /* 773940100a4SChris Mason * hopefully we have this extent in the tree already, try without 774940100a4SChris Mason * the full extent lock 775940100a4SChris Mason */ 776940100a4SChris Mason read_lock(&em_tree->lock); 777940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 778940100a4SChris Mason read_unlock(&em_tree->lock); 779940100a4SChris Mason 780940100a4SChris Mason if (!em) { 781940100a4SChris Mason /* get the big lock and read metadata off disk */ 782940100a4SChris Mason lock_extent(io_tree, start, start + len - 1, GFP_NOFS); 783940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 784940100a4SChris Mason unlock_extent(io_tree, start, start + len - 1, GFP_NOFS); 785940100a4SChris Mason 7866cf8bfbfSDan Carpenter if (IS_ERR(em)) 787940100a4SChris Mason return 0; 788940100a4SChris Mason } 789940100a4SChris Mason 790940100a4SChris Mason /* this will cover holes, and inline extents */ 791940100a4SChris Mason if (em->block_start >= EXTENT_MAP_LAST_BYTE) 792940100a4SChris Mason ret = 0; 793940100a4SChris Mason 794940100a4SChris Mason /* 795940100a4SChris Mason * we hit a real extent, if it is big don't bother defragging it again 796940100a4SChris Mason */ 7971e701a32SChris Mason if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh) 798940100a4SChris Mason ret = 0; 799940100a4SChris Mason 800940100a4SChris Mason /* 801940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 802940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 803940100a4SChris Mason * so that the next tiny extent will force a defrag. 804940100a4SChris Mason * 805940100a4SChris Mason * The end result of this is that tiny extents before a single big 806940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 807940100a4SChris Mason */ 808940100a4SChris Mason if (ret) { 809940100a4SChris Mason *last_len += len; 810940100a4SChris Mason *defrag_end = extent_map_end(em); 811940100a4SChris Mason } else { 812940100a4SChris Mason *last_len = 0; 813940100a4SChris Mason *skip = extent_map_end(em); 814940100a4SChris Mason *defrag_end = 0; 815940100a4SChris Mason } 816940100a4SChris Mason 817940100a4SChris Mason free_extent_map(em); 818940100a4SChris Mason return ret; 819940100a4SChris Mason } 820940100a4SChris Mason 8214cb5300bSChris Mason /* 8224cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 8234cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 8244cb5300bSChris Mason * to COW and defrag. 8254cb5300bSChris Mason * 8264cb5300bSChris Mason * It also makes sure the delalloc code has enough 8274cb5300bSChris Mason * dirty data to avoid making new small extents as part 8284cb5300bSChris Mason * of the defrag 8294cb5300bSChris Mason * 8304cb5300bSChris Mason * It's a good idea to start RA on this range 8314cb5300bSChris Mason * before calling this. 8324cb5300bSChris Mason */ 8334cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 8344cb5300bSChris Mason struct page **pages, 8354cb5300bSChris Mason unsigned long start_index, 8364cb5300bSChris Mason int num_pages) 837f46b5a66SChristoph Hellwig { 8384cb5300bSChris Mason unsigned long file_end; 8394cb5300bSChris Mason u64 isize = i_size_read(inode); 840f46b5a66SChristoph Hellwig u64 page_start; 841f46b5a66SChristoph Hellwig u64 page_end; 8424cb5300bSChris Mason int ret; 8434cb5300bSChris Mason int i; 8444cb5300bSChris Mason int i_done; 8454cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 8464cb5300bSChris Mason struct extent_state *cached_state = NULL; 8474cb5300bSChris Mason 8484cb5300bSChris Mason if (isize == 0) 8494cb5300bSChris Mason return 0; 8504cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 8514cb5300bSChris Mason 8524cb5300bSChris Mason ret = btrfs_delalloc_reserve_space(inode, 8534cb5300bSChris Mason num_pages << PAGE_CACHE_SHIFT); 8544cb5300bSChris Mason if (ret) 8554cb5300bSChris Mason return ret; 8564cb5300bSChris Mason again: 8574cb5300bSChris Mason ret = 0; 8584cb5300bSChris Mason i_done = 0; 8594cb5300bSChris Mason 8604cb5300bSChris Mason /* step one, lock all the pages */ 8614cb5300bSChris Mason for (i = 0; i < num_pages; i++) { 8624cb5300bSChris Mason struct page *page; 863a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 864a94733d0SJosef Bacik start_index + i, GFP_NOFS); 8654cb5300bSChris Mason if (!page) 8664cb5300bSChris Mason break; 8674cb5300bSChris Mason 8684cb5300bSChris Mason if (!PageUptodate(page)) { 8694cb5300bSChris Mason btrfs_readpage(NULL, page); 8704cb5300bSChris Mason lock_page(page); 8714cb5300bSChris Mason if (!PageUptodate(page)) { 8724cb5300bSChris Mason unlock_page(page); 8734cb5300bSChris Mason page_cache_release(page); 8744cb5300bSChris Mason ret = -EIO; 8754cb5300bSChris Mason break; 8764cb5300bSChris Mason } 8774cb5300bSChris Mason } 8784cb5300bSChris Mason isize = i_size_read(inode); 8794cb5300bSChris Mason file_end = (isize - 1) >> PAGE_CACHE_SHIFT; 8804cb5300bSChris Mason if (!isize || page->index > file_end || 8814cb5300bSChris Mason page->mapping != inode->i_mapping) { 8824cb5300bSChris Mason /* whoops, we blew past eof, skip this page */ 8834cb5300bSChris Mason unlock_page(page); 8844cb5300bSChris Mason page_cache_release(page); 8854cb5300bSChris Mason break; 8864cb5300bSChris Mason } 8874cb5300bSChris Mason pages[i] = page; 8884cb5300bSChris Mason i_done++; 8894cb5300bSChris Mason } 8904cb5300bSChris Mason if (!i_done || ret) 8914cb5300bSChris Mason goto out; 8924cb5300bSChris Mason 8934cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 8944cb5300bSChris Mason goto out; 8954cb5300bSChris Mason 8964cb5300bSChris Mason /* 8974cb5300bSChris Mason * so now we have a nice long stream of locked 8984cb5300bSChris Mason * and up to date pages, lets wait on them 8994cb5300bSChris Mason */ 9004cb5300bSChris Mason for (i = 0; i < i_done; i++) 9014cb5300bSChris Mason wait_on_page_writeback(pages[i]); 9024cb5300bSChris Mason 9034cb5300bSChris Mason page_start = page_offset(pages[0]); 9044cb5300bSChris Mason page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; 9054cb5300bSChris Mason 9064cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 9074cb5300bSChris Mason page_start, page_end - 1, 0, &cached_state, 9084cb5300bSChris Mason GFP_NOFS); 9094cb5300bSChris Mason ordered = btrfs_lookup_first_ordered_extent(inode, page_end - 1); 9104cb5300bSChris Mason if (ordered && 9114cb5300bSChris Mason ordered->file_offset + ordered->len > page_start && 9124cb5300bSChris Mason ordered->file_offset < page_end) { 9134cb5300bSChris Mason btrfs_put_ordered_extent(ordered); 9144cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 9154cb5300bSChris Mason page_start, page_end - 1, 9164cb5300bSChris Mason &cached_state, GFP_NOFS); 9174cb5300bSChris Mason for (i = 0; i < i_done; i++) { 9184cb5300bSChris Mason unlock_page(pages[i]); 9194cb5300bSChris Mason page_cache_release(pages[i]); 9204cb5300bSChris Mason } 9214cb5300bSChris Mason btrfs_wait_ordered_range(inode, page_start, 9224cb5300bSChris Mason page_end - page_start); 9234cb5300bSChris Mason goto again; 9244cb5300bSChris Mason } 9254cb5300bSChris Mason if (ordered) 9264cb5300bSChris Mason btrfs_put_ordered_extent(ordered); 9274cb5300bSChris Mason 9284cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 9294cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 9304cb5300bSChris Mason EXTENT_DO_ACCOUNTING, 0, 0, &cached_state, 9314cb5300bSChris Mason GFP_NOFS); 9324cb5300bSChris Mason 9334cb5300bSChris Mason if (i_done != num_pages) { 9349e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 9359e0baf60SJosef Bacik BTRFS_I(inode)->outstanding_extents++; 9369e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 9374cb5300bSChris Mason btrfs_delalloc_release_space(inode, 9384cb5300bSChris Mason (num_pages - i_done) << PAGE_CACHE_SHIFT); 9394cb5300bSChris Mason } 9404cb5300bSChris Mason 9414cb5300bSChris Mason 9424cb5300bSChris Mason btrfs_set_extent_delalloc(inode, page_start, page_end - 1, 9434cb5300bSChris Mason &cached_state); 9444cb5300bSChris Mason 9454cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 9464cb5300bSChris Mason page_start, page_end - 1, &cached_state, 9474cb5300bSChris Mason GFP_NOFS); 9484cb5300bSChris Mason 9494cb5300bSChris Mason for (i = 0; i < i_done; i++) { 9504cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 9514cb5300bSChris Mason ClearPageChecked(pages[i]); 9524cb5300bSChris Mason set_page_extent_mapped(pages[i]); 9534cb5300bSChris Mason set_page_dirty(pages[i]); 9544cb5300bSChris Mason unlock_page(pages[i]); 9554cb5300bSChris Mason page_cache_release(pages[i]); 9564cb5300bSChris Mason } 9574cb5300bSChris Mason return i_done; 9584cb5300bSChris Mason out: 9594cb5300bSChris Mason for (i = 0; i < i_done; i++) { 9604cb5300bSChris Mason unlock_page(pages[i]); 9614cb5300bSChris Mason page_cache_release(pages[i]); 9624cb5300bSChris Mason } 9634cb5300bSChris Mason btrfs_delalloc_release_space(inode, num_pages << PAGE_CACHE_SHIFT); 9644cb5300bSChris Mason return ret; 9654cb5300bSChris Mason 9664cb5300bSChris Mason } 9674cb5300bSChris Mason 9684cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 9694cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 9704cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 9714cb5300bSChris Mason { 9724cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 9734cb5300bSChris Mason struct btrfs_super_block *disk_super; 9744cb5300bSChris Mason struct file_ra_state *ra = NULL; 9754cb5300bSChris Mason unsigned long last_index; 9764cb5300bSChris Mason u64 features; 977940100a4SChris Mason u64 last_len = 0; 978940100a4SChris Mason u64 skip = 0; 979940100a4SChris Mason u64 defrag_end = 0; 9804cb5300bSChris Mason u64 newer_off = range->start; 9814cb5300bSChris Mason int newer_left = 0; 982f46b5a66SChristoph Hellwig unsigned long i; 983f46b5a66SChristoph Hellwig int ret; 9844cb5300bSChris Mason int defrag_count = 0; 9851a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 9864cb5300bSChris Mason int extent_thresh = range->extent_thresh; 9874cb5300bSChris Mason int newer_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; 9884cb5300bSChris Mason u64 new_align = ~((u64)128 * 1024 - 1); 9894cb5300bSChris Mason struct page **pages = NULL; 9904cb5300bSChris Mason 9914cb5300bSChris Mason if (extent_thresh == 0) 9924cb5300bSChris Mason extent_thresh = 256 * 1024; 9931a419d85SLi Zefan 9941a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 9951a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 9961a419d85SLi Zefan return -EINVAL; 9971a419d85SLi Zefan if (range->compress_type) 9981a419d85SLi Zefan compress_type = range->compress_type; 9991a419d85SLi Zefan } 1000f46b5a66SChristoph Hellwig 1001940100a4SChris Mason if (inode->i_size == 0) 1002940100a4SChris Mason return 0; 1003f46b5a66SChristoph Hellwig 10044cb5300bSChris Mason /* 10054cb5300bSChris Mason * if we were not given a file, allocate a readahead 10064cb5300bSChris Mason * context 10074cb5300bSChris Mason */ 10084cb5300bSChris Mason if (!file) { 10094cb5300bSChris Mason ra = kzalloc(sizeof(*ra), GFP_NOFS); 10104cb5300bSChris Mason if (!ra) 10114cb5300bSChris Mason return -ENOMEM; 10124cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 10134cb5300bSChris Mason } else { 10144cb5300bSChris Mason ra = &file->f_ra; 10154cb5300bSChris Mason } 10164cb5300bSChris Mason 10174cb5300bSChris Mason pages = kmalloc(sizeof(struct page *) * newer_cluster, 10184cb5300bSChris Mason GFP_NOFS); 10194cb5300bSChris Mason if (!pages) { 10204cb5300bSChris Mason ret = -ENOMEM; 10214cb5300bSChris Mason goto out_ra; 10224cb5300bSChris Mason } 10234cb5300bSChris Mason 10244cb5300bSChris Mason /* find the last page to defrag */ 10251e701a32SChris Mason if (range->start + range->len > range->start) { 10261e701a32SChris Mason last_index = min_t(u64, inode->i_size - 1, 10271e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 10281e701a32SChris Mason } else { 1029940100a4SChris Mason last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; 10301e701a32SChris Mason } 10311e701a32SChris Mason 10324cb5300bSChris Mason if (newer_than) { 10334cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 10344cb5300bSChris Mason &newer_off, 64 * 1024); 10354cb5300bSChris Mason if (!ret) { 10364cb5300bSChris Mason range->start = newer_off; 10374cb5300bSChris Mason /* 10384cb5300bSChris Mason * we always align our defrag to help keep 10394cb5300bSChris Mason * the extents in the file evenly spaced 10404cb5300bSChris Mason */ 10414cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 10424cb5300bSChris Mason newer_left = newer_cluster; 10434cb5300bSChris Mason } else 10444cb5300bSChris Mason goto out_ra; 10454cb5300bSChris Mason } else { 10461e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 10474cb5300bSChris Mason } 10484cb5300bSChris Mason if (!max_to_defrag) 10494cb5300bSChris Mason max_to_defrag = last_index - 1; 10504cb5300bSChris Mason 10514cb5300bSChris Mason while (i <= last_index && defrag_count < max_to_defrag) { 10524cb5300bSChris Mason /* 10534cb5300bSChris Mason * make sure we stop running if someone unmounts 10544cb5300bSChris Mason * the FS 10554cb5300bSChris Mason */ 10564cb5300bSChris Mason if (!(inode->i_sb->s_flags & MS_ACTIVE)) 10574cb5300bSChris Mason break; 10584cb5300bSChris Mason 10594cb5300bSChris Mason if (!newer_than && 10604cb5300bSChris Mason !should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 10611e701a32SChris Mason PAGE_CACHE_SIZE, 10624cb5300bSChris Mason extent_thresh, 10631e701a32SChris Mason &last_len, &skip, 1064940100a4SChris Mason &defrag_end)) { 1065940100a4SChris Mason unsigned long next; 1066940100a4SChris Mason /* 1067940100a4SChris Mason * the should_defrag function tells us how much to skip 1068940100a4SChris Mason * bump our counter by the suggested amount 1069940100a4SChris Mason */ 1070940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 1071940100a4SChris Mason i = max(i + 1, next); 1072940100a4SChris Mason continue; 1073940100a4SChris Mason } 10741e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 10751a419d85SLi Zefan BTRFS_I(inode)->force_compress = compress_type; 1076940100a4SChris Mason 10774cb5300bSChris Mason btrfs_force_ra(inode->i_mapping, ra, file, i, newer_cluster); 10784cb5300bSChris Mason 10794cb5300bSChris Mason ret = cluster_pages_for_defrag(inode, pages, i, newer_cluster); 10804cb5300bSChris Mason if (ret < 0) 10814cb5300bSChris Mason goto out_ra; 10824cb5300bSChris Mason 10834cb5300bSChris Mason defrag_count += ret; 10844cb5300bSChris Mason balance_dirty_pages_ratelimited_nr(inode->i_mapping, ret); 10854cb5300bSChris Mason i += ret; 10864cb5300bSChris Mason 10874cb5300bSChris Mason if (newer_than) { 10884cb5300bSChris Mason if (newer_off == (u64)-1) 10894cb5300bSChris Mason break; 10904cb5300bSChris Mason 10914cb5300bSChris Mason newer_off = max(newer_off + 1, 10924cb5300bSChris Mason (u64)i << PAGE_CACHE_SHIFT); 10934cb5300bSChris Mason 10944cb5300bSChris Mason ret = find_new_extents(root, inode, 10954cb5300bSChris Mason newer_than, &newer_off, 10964cb5300bSChris Mason 64 * 1024); 10974cb5300bSChris Mason if (!ret) { 10984cb5300bSChris Mason range->start = newer_off; 10994cb5300bSChris Mason i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; 11004cb5300bSChris Mason newer_left = newer_cluster; 11014cb5300bSChris Mason } else { 11024cb5300bSChris Mason break; 1103940100a4SChris Mason } 11044cb5300bSChris Mason } else { 1105940100a4SChris Mason i++; 1106f46b5a66SChristoph Hellwig } 11074cb5300bSChris Mason } 1108f46b5a66SChristoph Hellwig 11091e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 11101e701a32SChris Mason filemap_flush(inode->i_mapping); 11111e701a32SChris Mason 11121e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 11131e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 11141e701a32SChris Mason * we have to make sure the IO is actually started and that 11151e701a32SChris Mason * ordered extents get created before we return 11161e701a32SChris Mason */ 11171e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 11181e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 11191e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 11201e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 11211e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 11221e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 11231e701a32SChris Mason } 11241e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 11251e701a32SChris Mason 11261e701a32SChris Mason mutex_lock(&inode->i_mutex); 1127261507a0SLi Zefan BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 11281e701a32SChris Mason mutex_unlock(&inode->i_mutex); 11291e701a32SChris Mason } 11301e701a32SChris Mason 11311a419d85SLi Zefan disk_super = &root->fs_info->super_copy; 11321a419d85SLi Zefan features = btrfs_super_incompat_flags(disk_super); 11331a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 11341a419d85SLi Zefan features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; 11351a419d85SLi Zefan btrfs_set_super_incompat_flags(disk_super, features); 11361a419d85SLi Zefan } 11371a419d85SLi Zefan 11384cb5300bSChris Mason if (!file) 11394cb5300bSChris Mason kfree(ra); 11404cb5300bSChris Mason return defrag_count; 1141940100a4SChris Mason 11424cb5300bSChris Mason out_ra: 11434cb5300bSChris Mason if (!file) 11444cb5300bSChris Mason kfree(ra); 11454cb5300bSChris Mason kfree(pages); 1146940100a4SChris Mason return ret; 1147f46b5a66SChristoph Hellwig } 1148f46b5a66SChristoph Hellwig 114976dda93cSYan, Zheng static noinline int btrfs_ioctl_resize(struct btrfs_root *root, 115076dda93cSYan, Zheng void __user *arg) 1151f46b5a66SChristoph Hellwig { 1152f46b5a66SChristoph Hellwig u64 new_size; 1153f46b5a66SChristoph Hellwig u64 old_size; 1154f46b5a66SChristoph Hellwig u64 devid = 1; 1155f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1156f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1157f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1158f46b5a66SChristoph Hellwig char *sizestr; 1159f46b5a66SChristoph Hellwig char *devstr = NULL; 1160f46b5a66SChristoph Hellwig int ret = 0; 1161f46b5a66SChristoph Hellwig int mod = 0; 1162f46b5a66SChristoph Hellwig 1163c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1164c146afadSYan Zheng return -EROFS; 1165c146afadSYan Zheng 1166e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1167e441d54dSChris Mason return -EPERM; 1168e441d54dSChris Mason 1169dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1170dae7b665SLi Zefan if (IS_ERR(vol_args)) 1171dae7b665SLi Zefan return PTR_ERR(vol_args); 11725516e595SMark Fasheh 11735516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1174f46b5a66SChristoph Hellwig 11757d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 1176f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1177f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1178f46b5a66SChristoph Hellwig if (devstr) { 1179f46b5a66SChristoph Hellwig char *end; 1180f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1181f46b5a66SChristoph Hellwig *devstr = '\0'; 1182f46b5a66SChristoph Hellwig devstr = vol_args->name; 1183f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 118421380931SJoel Becker printk(KERN_INFO "resizing devid %llu\n", 118521380931SJoel Becker (unsigned long long)devid); 1186f46b5a66SChristoph Hellwig } 11872b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 1188f46b5a66SChristoph Hellwig if (!device) { 118921380931SJoel Becker printk(KERN_INFO "resizer unable to find device %llu\n", 119021380931SJoel Becker (unsigned long long)devid); 1191f46b5a66SChristoph Hellwig ret = -EINVAL; 1192f46b5a66SChristoph Hellwig goto out_unlock; 1193f46b5a66SChristoph Hellwig } 1194f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1195f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1196f46b5a66SChristoph Hellwig else { 1197f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1198f46b5a66SChristoph Hellwig mod = -1; 1199f46b5a66SChristoph Hellwig sizestr++; 1200f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1201f46b5a66SChristoph Hellwig mod = 1; 1202f46b5a66SChristoph Hellwig sizestr++; 1203f46b5a66SChristoph Hellwig } 120491748467SAkinobu Mita new_size = memparse(sizestr, NULL); 1205f46b5a66SChristoph Hellwig if (new_size == 0) { 1206f46b5a66SChristoph Hellwig ret = -EINVAL; 1207f46b5a66SChristoph Hellwig goto out_unlock; 1208f46b5a66SChristoph Hellwig } 1209f46b5a66SChristoph Hellwig } 1210f46b5a66SChristoph Hellwig 1211f46b5a66SChristoph Hellwig old_size = device->total_bytes; 1212f46b5a66SChristoph Hellwig 1213f46b5a66SChristoph Hellwig if (mod < 0) { 1214f46b5a66SChristoph Hellwig if (new_size > old_size) { 1215f46b5a66SChristoph Hellwig ret = -EINVAL; 1216f46b5a66SChristoph Hellwig goto out_unlock; 1217f46b5a66SChristoph Hellwig } 1218f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1219f46b5a66SChristoph Hellwig } else if (mod > 0) { 1220f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1221f46b5a66SChristoph Hellwig } 1222f46b5a66SChristoph Hellwig 1223f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 1224f46b5a66SChristoph Hellwig ret = -EINVAL; 1225f46b5a66SChristoph Hellwig goto out_unlock; 1226f46b5a66SChristoph Hellwig } 1227f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1228f46b5a66SChristoph Hellwig ret = -EFBIG; 1229f46b5a66SChristoph Hellwig goto out_unlock; 1230f46b5a66SChristoph Hellwig } 1231f46b5a66SChristoph Hellwig 1232f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 1233f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 1234f46b5a66SChristoph Hellwig 1235f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 1236f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 1237f46b5a66SChristoph Hellwig 1238f46b5a66SChristoph Hellwig if (new_size > old_size) { 1239a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 124098d5dc13STsutomu Itoh if (IS_ERR(trans)) { 124198d5dc13STsutomu Itoh ret = PTR_ERR(trans); 124298d5dc13STsutomu Itoh goto out_unlock; 124398d5dc13STsutomu Itoh } 1244f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1245f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1246f46b5a66SChristoph Hellwig } else { 1247f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 1248f46b5a66SChristoph Hellwig } 1249f46b5a66SChristoph Hellwig 1250f46b5a66SChristoph Hellwig out_unlock: 12517d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 1252f46b5a66SChristoph Hellwig kfree(vol_args); 1253f46b5a66SChristoph Hellwig return ret; 1254f46b5a66SChristoph Hellwig } 1255f46b5a66SChristoph Hellwig 125672fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 125772fd032eSSage Weil char *name, 125872fd032eSSage Weil unsigned long fd, 125972fd032eSSage Weil int subvol, 1260b83cc969SLi Zefan u64 *transid, 1261b83cc969SLi Zefan bool readonly) 1262f46b5a66SChristoph Hellwig { 1263cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 12643de4586cSChris Mason struct file *src_file; 1265f46b5a66SChristoph Hellwig int namelen; 12663de4586cSChris Mason int ret = 0; 1267f46b5a66SChristoph Hellwig 1268c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1269c146afadSYan Zheng return -EROFS; 1270c146afadSYan Zheng 127172fd032eSSage Weil namelen = strlen(name); 127272fd032eSSage Weil if (strchr(name, '/')) { 1273f46b5a66SChristoph Hellwig ret = -EINVAL; 1274f46b5a66SChristoph Hellwig goto out; 1275f46b5a66SChristoph Hellwig } 1276f46b5a66SChristoph Hellwig 12773de4586cSChris Mason if (subvol) { 127872fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 1279b83cc969SLi Zefan NULL, transid, readonly); 1280cb8e7090SChristoph Hellwig } else { 12813de4586cSChris Mason struct inode *src_inode; 128272fd032eSSage Weil src_file = fget(fd); 12833de4586cSChris Mason if (!src_file) { 12843de4586cSChris Mason ret = -EINVAL; 12853de4586cSChris Mason goto out; 12863de4586cSChris Mason } 12873de4586cSChris Mason 12883de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 12893de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 1290d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 1291d397712bSChris Mason "another FS\n"); 12923de4586cSChris Mason ret = -EINVAL; 12933de4586cSChris Mason fput(src_file); 12943de4586cSChris Mason goto out; 12953de4586cSChris Mason } 129672fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 129772fd032eSSage Weil BTRFS_I(src_inode)->root, 1298b83cc969SLi Zefan transid, readonly); 12993de4586cSChris Mason fput(src_file); 1300cb8e7090SChristoph Hellwig } 1301f46b5a66SChristoph Hellwig out: 130272fd032eSSage Weil return ret; 130372fd032eSSage Weil } 130472fd032eSSage Weil 130572fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1306fa0d2b9bSLi Zefan void __user *arg, int subvol) 130772fd032eSSage Weil { 1308fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 130972fd032eSSage Weil int ret; 131072fd032eSSage Weil 1311fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1312fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1313fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1314fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1315fa0d2b9bSLi Zefan 1316fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1317b83cc969SLi Zefan vol_args->fd, subvol, 1318b83cc969SLi Zefan NULL, false); 1319fa0d2b9bSLi Zefan 1320fa0d2b9bSLi Zefan kfree(vol_args); 1321fa0d2b9bSLi Zefan return ret; 1322fa0d2b9bSLi Zefan } 1323fa0d2b9bSLi Zefan 1324fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1325fa0d2b9bSLi Zefan void __user *arg, int subvol) 1326fa0d2b9bSLi Zefan { 1327fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1328fa0d2b9bSLi Zefan int ret; 1329fdfb1e4fSLi Zefan u64 transid = 0; 1330fdfb1e4fSLi Zefan u64 *ptr = NULL; 1331b83cc969SLi Zefan bool readonly = false; 133272fd032eSSage Weil 1333fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1334fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1335fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1336fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1337fdfb1e4fSLi Zefan 1338b83cc969SLi Zefan if (vol_args->flags & 1339b83cc969SLi Zefan ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY)) { 1340b83cc969SLi Zefan ret = -EOPNOTSUPP; 1341fdfb1e4fSLi Zefan goto out; 1342fdfb1e4fSLi Zefan } 1343fdfb1e4fSLi Zefan 1344fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1345fdfb1e4fSLi Zefan ptr = &transid; 1346b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1347b83cc969SLi Zefan readonly = true; 134875eaa0e2SSage Weil 1349fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1350b83cc969SLi Zefan vol_args->fd, subvol, 1351b83cc969SLi Zefan ptr, readonly); 135275eaa0e2SSage Weil 1353fdfb1e4fSLi Zefan if (ret == 0 && ptr && 135475eaa0e2SSage Weil copy_to_user(arg + 1355fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1356fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 135775eaa0e2SSage Weil ret = -EFAULT; 1358fdfb1e4fSLi Zefan out: 1359f46b5a66SChristoph Hellwig kfree(vol_args); 1360f46b5a66SChristoph Hellwig return ret; 1361f46b5a66SChristoph Hellwig } 1362f46b5a66SChristoph Hellwig 13630caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 13640caa102dSLi Zefan void __user *arg) 13650caa102dSLi Zefan { 13660caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 13670caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 13680caa102dSLi Zefan int ret = 0; 13690caa102dSLi Zefan u64 flags = 0; 13700caa102dSLi Zefan 137133345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 13720caa102dSLi Zefan return -EINVAL; 13730caa102dSLi Zefan 13740caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 13750caa102dSLi Zefan if (btrfs_root_readonly(root)) 13760caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 13770caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 13780caa102dSLi Zefan 13790caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 13800caa102dSLi Zefan ret = -EFAULT; 13810caa102dSLi Zefan 13820caa102dSLi Zefan return ret; 13830caa102dSLi Zefan } 13840caa102dSLi Zefan 13850caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 13860caa102dSLi Zefan void __user *arg) 13870caa102dSLi Zefan { 13880caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 13890caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 13900caa102dSLi Zefan struct btrfs_trans_handle *trans; 13910caa102dSLi Zefan u64 root_flags; 13920caa102dSLi Zefan u64 flags; 13930caa102dSLi Zefan int ret = 0; 13940caa102dSLi Zefan 13950caa102dSLi Zefan if (root->fs_info->sb->s_flags & MS_RDONLY) 13960caa102dSLi Zefan return -EROFS; 13970caa102dSLi Zefan 139833345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) 13990caa102dSLi Zefan return -EINVAL; 14000caa102dSLi Zefan 14010caa102dSLi Zefan if (copy_from_user(&flags, arg, sizeof(flags))) 14020caa102dSLi Zefan return -EFAULT; 14030caa102dSLi Zefan 1404b4dc2b8cSLi Zefan if (flags & BTRFS_SUBVOL_CREATE_ASYNC) 14050caa102dSLi Zefan return -EINVAL; 14060caa102dSLi Zefan 14070caa102dSLi Zefan if (flags & ~BTRFS_SUBVOL_RDONLY) 14080caa102dSLi Zefan return -EOPNOTSUPP; 14090caa102dSLi Zefan 14102e149670SSerge E. Hallyn if (!inode_owner_or_capable(inode)) 1411b4dc2b8cSLi Zefan return -EACCES; 1412b4dc2b8cSLi Zefan 14130caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 14140caa102dSLi Zefan 14150caa102dSLi Zefan /* nothing to do */ 14160caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 14170caa102dSLi Zefan goto out; 14180caa102dSLi Zefan 14190caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 14200caa102dSLi Zefan if (flags & BTRFS_SUBVOL_RDONLY) 14210caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 14220caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 14230caa102dSLi Zefan else 14240caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 14250caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 14260caa102dSLi Zefan 14270caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 14280caa102dSLi Zefan if (IS_ERR(trans)) { 14290caa102dSLi Zefan ret = PTR_ERR(trans); 14300caa102dSLi Zefan goto out_reset; 14310caa102dSLi Zefan } 14320caa102dSLi Zefan 1433b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 14340caa102dSLi Zefan &root->root_key, &root->root_item); 14350caa102dSLi Zefan 14360caa102dSLi Zefan btrfs_commit_transaction(trans, root); 14370caa102dSLi Zefan out_reset: 14380caa102dSLi Zefan if (ret) 14390caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 14400caa102dSLi Zefan out: 14410caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 14420caa102dSLi Zefan return ret; 14430caa102dSLi Zefan } 14440caa102dSLi Zefan 144576dda93cSYan, Zheng /* 144676dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 144776dda93cSYan, Zheng */ 144876dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 144976dda93cSYan, Zheng { 145076dda93cSYan, Zheng struct btrfs_path *path; 145176dda93cSYan, Zheng struct btrfs_key key; 145276dda93cSYan, Zheng int ret; 145376dda93cSYan, Zheng 145476dda93cSYan, Zheng path = btrfs_alloc_path(); 145576dda93cSYan, Zheng if (!path) 145676dda93cSYan, Zheng return -ENOMEM; 145776dda93cSYan, Zheng 145876dda93cSYan, Zheng key.objectid = root->root_key.objectid; 145976dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 146076dda93cSYan, Zheng key.offset = (u64)-1; 146176dda93cSYan, Zheng 146276dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 146376dda93cSYan, Zheng &key, path, 0, 0); 146476dda93cSYan, Zheng if (ret < 0) 146576dda93cSYan, Zheng goto out; 146676dda93cSYan, Zheng BUG_ON(ret == 0); 146776dda93cSYan, Zheng 146876dda93cSYan, Zheng ret = 0; 146976dda93cSYan, Zheng if (path->slots[0] > 0) { 147076dda93cSYan, Zheng path->slots[0]--; 147176dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 147276dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 147376dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 147476dda93cSYan, Zheng ret = -ENOTEMPTY; 147576dda93cSYan, Zheng } 147676dda93cSYan, Zheng out: 147776dda93cSYan, Zheng btrfs_free_path(path); 147876dda93cSYan, Zheng return ret; 147976dda93cSYan, Zheng } 148076dda93cSYan, Zheng 1481ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1482ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1483ac8e9819SChris Mason { 1484abc6e134SChris Mason struct btrfs_key test; 1485abc6e134SChris Mason int ret; 1486abc6e134SChris Mason 1487abc6e134SChris Mason test.objectid = sk->min_objectid; 1488abc6e134SChris Mason test.type = sk->min_type; 1489abc6e134SChris Mason test.offset = sk->min_offset; 1490abc6e134SChris Mason 1491abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1492abc6e134SChris Mason if (ret < 0) 1493ac8e9819SChris Mason return 0; 1494abc6e134SChris Mason 1495abc6e134SChris Mason test.objectid = sk->max_objectid; 1496abc6e134SChris Mason test.type = sk->max_type; 1497abc6e134SChris Mason test.offset = sk->max_offset; 1498abc6e134SChris Mason 1499abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1500abc6e134SChris Mason if (ret > 0) 1501ac8e9819SChris Mason return 0; 1502ac8e9819SChris Mason return 1; 1503ac8e9819SChris Mason } 1504ac8e9819SChris Mason 1505ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1506ac8e9819SChris Mason struct btrfs_path *path, 1507ac8e9819SChris Mason struct btrfs_key *key, 1508ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1509ac8e9819SChris Mason char *buf, 1510ac8e9819SChris Mason unsigned long *sk_offset, 1511ac8e9819SChris Mason int *num_found) 1512ac8e9819SChris Mason { 1513ac8e9819SChris Mason u64 found_transid; 1514ac8e9819SChris Mason struct extent_buffer *leaf; 1515ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1516ac8e9819SChris Mason unsigned long item_off; 1517ac8e9819SChris Mason unsigned long item_len; 1518ac8e9819SChris Mason int nritems; 1519ac8e9819SChris Mason int i; 1520ac8e9819SChris Mason int slot; 1521ac8e9819SChris Mason int ret = 0; 1522ac8e9819SChris Mason 1523ac8e9819SChris Mason leaf = path->nodes[0]; 1524ac8e9819SChris Mason slot = path->slots[0]; 1525ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1526ac8e9819SChris Mason 1527ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1528ac8e9819SChris Mason i = nritems; 1529ac8e9819SChris Mason goto advance_key; 1530ac8e9819SChris Mason } 1531ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1532ac8e9819SChris Mason 1533ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1534ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1535ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1536ac8e9819SChris Mason 1537ac8e9819SChris Mason if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1538ac8e9819SChris Mason item_len = 0; 1539ac8e9819SChris Mason 1540ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1541ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1542ac8e9819SChris Mason ret = 1; 1543ac8e9819SChris Mason goto overflow; 1544ac8e9819SChris Mason } 1545ac8e9819SChris Mason 1546ac8e9819SChris Mason btrfs_item_key_to_cpu(leaf, key, i); 1547ac8e9819SChris Mason if (!key_in_sk(key, sk)) 1548ac8e9819SChris Mason continue; 1549ac8e9819SChris Mason 1550ac8e9819SChris Mason sh.objectid = key->objectid; 1551ac8e9819SChris Mason sh.offset = key->offset; 1552ac8e9819SChris Mason sh.type = key->type; 1553ac8e9819SChris Mason sh.len = item_len; 1554ac8e9819SChris Mason sh.transid = found_transid; 1555ac8e9819SChris Mason 1556ac8e9819SChris Mason /* copy search result header */ 1557ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1558ac8e9819SChris Mason *sk_offset += sizeof(sh); 1559ac8e9819SChris Mason 1560ac8e9819SChris Mason if (item_len) { 1561ac8e9819SChris Mason char *p = buf + *sk_offset; 1562ac8e9819SChris Mason /* copy the item */ 1563ac8e9819SChris Mason read_extent_buffer(leaf, p, 1564ac8e9819SChris Mason item_off, item_len); 1565ac8e9819SChris Mason *sk_offset += item_len; 1566ac8e9819SChris Mason } 1567e2156867SHugo Mills (*num_found)++; 1568ac8e9819SChris Mason 1569ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1570ac8e9819SChris Mason break; 1571ac8e9819SChris Mason } 1572ac8e9819SChris Mason advance_key: 1573ac8e9819SChris Mason ret = 0; 1574abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1575abc6e134SChris Mason key->offset++; 1576abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1577abc6e134SChris Mason key->offset = 0; 1578abc6e134SChris Mason key->type++; 1579abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1580abc6e134SChris Mason key->offset = 0; 1581abc6e134SChris Mason key->type = 0; 1582abc6e134SChris Mason key->objectid++; 1583abc6e134SChris Mason } else 1584abc6e134SChris Mason ret = 1; 1585ac8e9819SChris Mason overflow: 1586ac8e9819SChris Mason return ret; 1587ac8e9819SChris Mason } 1588ac8e9819SChris Mason 1589ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1590ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1591ac8e9819SChris Mason { 1592ac8e9819SChris Mason struct btrfs_root *root; 1593ac8e9819SChris Mason struct btrfs_key key; 1594ac8e9819SChris Mason struct btrfs_key max_key; 1595ac8e9819SChris Mason struct btrfs_path *path; 1596ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1597ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1598ac8e9819SChris Mason int ret; 1599ac8e9819SChris Mason int num_found = 0; 1600ac8e9819SChris Mason unsigned long sk_offset = 0; 1601ac8e9819SChris Mason 1602ac8e9819SChris Mason path = btrfs_alloc_path(); 1603ac8e9819SChris Mason if (!path) 1604ac8e9819SChris Mason return -ENOMEM; 1605ac8e9819SChris Mason 1606ac8e9819SChris Mason if (sk->tree_id == 0) { 1607ac8e9819SChris Mason /* search the root of the inode that was passed */ 1608ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1609ac8e9819SChris Mason } else { 1610ac8e9819SChris Mason key.objectid = sk->tree_id; 1611ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1612ac8e9819SChris Mason key.offset = (u64)-1; 1613ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1614ac8e9819SChris Mason if (IS_ERR(root)) { 1615ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1616ac8e9819SChris Mason sk->tree_id); 1617ac8e9819SChris Mason btrfs_free_path(path); 1618ac8e9819SChris Mason return -ENOENT; 1619ac8e9819SChris Mason } 1620ac8e9819SChris Mason } 1621ac8e9819SChris Mason 1622ac8e9819SChris Mason key.objectid = sk->min_objectid; 1623ac8e9819SChris Mason key.type = sk->min_type; 1624ac8e9819SChris Mason key.offset = sk->min_offset; 1625ac8e9819SChris Mason 1626ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1627ac8e9819SChris Mason max_key.type = sk->max_type; 1628ac8e9819SChris Mason max_key.offset = sk->max_offset; 1629ac8e9819SChris Mason 1630ac8e9819SChris Mason path->keep_locks = 1; 1631ac8e9819SChris Mason 1632ac8e9819SChris Mason while(1) { 1633ac8e9819SChris Mason ret = btrfs_search_forward(root, &key, &max_key, path, 0, 1634ac8e9819SChris Mason sk->min_transid); 1635ac8e9819SChris Mason if (ret != 0) { 1636ac8e9819SChris Mason if (ret > 0) 1637ac8e9819SChris Mason ret = 0; 1638ac8e9819SChris Mason goto err; 1639ac8e9819SChris Mason } 1640ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1641ac8e9819SChris Mason &sk_offset, &num_found); 1642b3b4aa74SDavid Sterba btrfs_release_path(path); 1643ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1644ac8e9819SChris Mason break; 1645ac8e9819SChris Mason 1646ac8e9819SChris Mason } 1647ac8e9819SChris Mason ret = 0; 1648ac8e9819SChris Mason err: 1649ac8e9819SChris Mason sk->nr_items = num_found; 1650ac8e9819SChris Mason btrfs_free_path(path); 1651ac8e9819SChris Mason return ret; 1652ac8e9819SChris Mason } 1653ac8e9819SChris Mason 1654ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1655ac8e9819SChris Mason void __user *argp) 1656ac8e9819SChris Mason { 1657ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1658ac8e9819SChris Mason struct inode *inode; 1659ac8e9819SChris Mason int ret; 1660ac8e9819SChris Mason 1661ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1662ac8e9819SChris Mason return -EPERM; 1663ac8e9819SChris Mason 16642354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 16652354d08fSJulia Lawall if (IS_ERR(args)) 16662354d08fSJulia Lawall return PTR_ERR(args); 1667ac8e9819SChris Mason 1668ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1669ac8e9819SChris Mason ret = search_ioctl(inode, args); 1670ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1671ac8e9819SChris Mason ret = -EFAULT; 1672ac8e9819SChris Mason kfree(args); 1673ac8e9819SChris Mason return ret; 1674ac8e9819SChris Mason } 1675ac8e9819SChris Mason 167698d377a0STARUISI Hiroaki /* 1677ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1678ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 167998d377a0STARUISI Hiroaki */ 168098d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 168198d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 168298d377a0STARUISI Hiroaki { 168398d377a0STARUISI Hiroaki struct btrfs_root *root; 168498d377a0STARUISI Hiroaki struct btrfs_key key; 1685ac8e9819SChris Mason char *ptr; 168698d377a0STARUISI Hiroaki int ret = -1; 168798d377a0STARUISI Hiroaki int slot; 168898d377a0STARUISI Hiroaki int len; 168998d377a0STARUISI Hiroaki int total_len = 0; 169098d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 169198d377a0STARUISI Hiroaki struct extent_buffer *l; 169298d377a0STARUISI Hiroaki struct btrfs_path *path; 169398d377a0STARUISI Hiroaki 169498d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 169598d377a0STARUISI Hiroaki name[0]='\0'; 169698d377a0STARUISI Hiroaki return 0; 169798d377a0STARUISI Hiroaki } 169898d377a0STARUISI Hiroaki 169998d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 170098d377a0STARUISI Hiroaki if (!path) 170198d377a0STARUISI Hiroaki return -ENOMEM; 170298d377a0STARUISI Hiroaki 1703ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 170498d377a0STARUISI Hiroaki 170598d377a0STARUISI Hiroaki key.objectid = tree_id; 170698d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 170798d377a0STARUISI Hiroaki key.offset = (u64)-1; 170898d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 170998d377a0STARUISI Hiroaki if (IS_ERR(root)) { 171098d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 17118ad6fcabSChris Mason ret = -ENOENT; 17128ad6fcabSChris Mason goto out; 171398d377a0STARUISI Hiroaki } 171498d377a0STARUISI Hiroaki 171598d377a0STARUISI Hiroaki key.objectid = dirid; 171698d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 17178ad6fcabSChris Mason key.offset = (u64)-1; 171898d377a0STARUISI Hiroaki 171998d377a0STARUISI Hiroaki while(1) { 172098d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 172198d377a0STARUISI Hiroaki if (ret < 0) 172298d377a0STARUISI Hiroaki goto out; 172398d377a0STARUISI Hiroaki 172498d377a0STARUISI Hiroaki l = path->nodes[0]; 172598d377a0STARUISI Hiroaki slot = path->slots[0]; 17268ad6fcabSChris Mason if (ret > 0 && slot > 0) 17278ad6fcabSChris Mason slot--; 172898d377a0STARUISI Hiroaki btrfs_item_key_to_cpu(l, &key, slot); 172998d377a0STARUISI Hiroaki 173098d377a0STARUISI Hiroaki if (ret > 0 && (key.objectid != dirid || 1731ac8e9819SChris Mason key.type != BTRFS_INODE_REF_KEY)) { 1732ac8e9819SChris Mason ret = -ENOENT; 173398d377a0STARUISI Hiroaki goto out; 1734ac8e9819SChris Mason } 173598d377a0STARUISI Hiroaki 173698d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 173798d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 173898d377a0STARUISI Hiroaki ptr -= len + 1; 173998d377a0STARUISI Hiroaki total_len += len + 1; 1740ac8e9819SChris Mason if (ptr < name) 174198d377a0STARUISI Hiroaki goto out; 174298d377a0STARUISI Hiroaki 174398d377a0STARUISI Hiroaki *(ptr + len) = '/'; 174498d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 174598d377a0STARUISI Hiroaki 174698d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 174798d377a0STARUISI Hiroaki break; 174898d377a0STARUISI Hiroaki 1749b3b4aa74SDavid Sterba btrfs_release_path(path); 175098d377a0STARUISI Hiroaki key.objectid = key.offset; 17518ad6fcabSChris Mason key.offset = (u64)-1; 175298d377a0STARUISI Hiroaki dirid = key.objectid; 175398d377a0STARUISI Hiroaki } 1754ac8e9819SChris Mason if (ptr < name) 175598d377a0STARUISI Hiroaki goto out; 175677906a50SLi Zefan memmove(name, ptr, total_len); 175798d377a0STARUISI Hiroaki name[total_len]='\0'; 175898d377a0STARUISI Hiroaki ret = 0; 175998d377a0STARUISI Hiroaki out: 176098d377a0STARUISI Hiroaki btrfs_free_path(path); 1761ac8e9819SChris Mason return ret; 1762ac8e9819SChris Mason } 1763ac8e9819SChris Mason 1764ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 1765ac8e9819SChris Mason void __user *argp) 1766ac8e9819SChris Mason { 1767ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 1768ac8e9819SChris Mason struct inode *inode; 1769ac8e9819SChris Mason int ret; 1770ac8e9819SChris Mason 1771ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1772ac8e9819SChris Mason return -EPERM; 1773ac8e9819SChris Mason 17742354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 17752354d08fSJulia Lawall if (IS_ERR(args)) 17762354d08fSJulia Lawall return PTR_ERR(args); 1777c2b96929SDan Carpenter 1778ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1779ac8e9819SChris Mason 17801b53ac4dSChris Mason if (args->treeid == 0) 17811b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 17821b53ac4dSChris Mason 1783ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 1784ac8e9819SChris Mason args->treeid, args->objectid, 1785ac8e9819SChris Mason args->name); 1786ac8e9819SChris Mason 1787ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1788ac8e9819SChris Mason ret = -EFAULT; 1789ac8e9819SChris Mason 1790ac8e9819SChris Mason kfree(args); 179198d377a0STARUISI Hiroaki return ret; 179298d377a0STARUISI Hiroaki } 179398d377a0STARUISI Hiroaki 179476dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 179576dda93cSYan, Zheng void __user *arg) 179676dda93cSYan, Zheng { 179776dda93cSYan, Zheng struct dentry *parent = fdentry(file); 179876dda93cSYan, Zheng struct dentry *dentry; 179976dda93cSYan, Zheng struct inode *dir = parent->d_inode; 180076dda93cSYan, Zheng struct inode *inode; 180176dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 180276dda93cSYan, Zheng struct btrfs_root *dest = NULL; 180376dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 180476dda93cSYan, Zheng struct btrfs_trans_handle *trans; 180576dda93cSYan, Zheng int namelen; 180676dda93cSYan, Zheng int ret; 180776dda93cSYan, Zheng int err = 0; 180876dda93cSYan, Zheng 180976dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 181076dda93cSYan, Zheng if (IS_ERR(vol_args)) 181176dda93cSYan, Zheng return PTR_ERR(vol_args); 181276dda93cSYan, Zheng 181376dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 181476dda93cSYan, Zheng namelen = strlen(vol_args->name); 181576dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 181676dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 181776dda93cSYan, Zheng err = -EINVAL; 181876dda93cSYan, Zheng goto out; 181976dda93cSYan, Zheng } 182076dda93cSYan, Zheng 182176dda93cSYan, Zheng err = mnt_want_write(file->f_path.mnt); 182276dda93cSYan, Zheng if (err) 182376dda93cSYan, Zheng goto out; 182476dda93cSYan, Zheng 182576dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 182676dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 182776dda93cSYan, Zheng if (IS_ERR(dentry)) { 182876dda93cSYan, Zheng err = PTR_ERR(dentry); 182976dda93cSYan, Zheng goto out_unlock_dir; 183076dda93cSYan, Zheng } 183176dda93cSYan, Zheng 183276dda93cSYan, Zheng if (!dentry->d_inode) { 183376dda93cSYan, Zheng err = -ENOENT; 183476dda93cSYan, Zheng goto out_dput; 183576dda93cSYan, Zheng } 183676dda93cSYan, Zheng 183776dda93cSYan, Zheng inode = dentry->d_inode; 18384260f7c7SSage Weil dest = BTRFS_I(inode)->root; 18394260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)){ 18404260f7c7SSage Weil /* 18414260f7c7SSage Weil * Regular user. Only allow this with a special mount 18424260f7c7SSage Weil * option, when the user has write+exec access to the 18434260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 18444260f7c7SSage Weil * allowed. 18454260f7c7SSage Weil * 18464260f7c7SSage Weil * Note that this is _not_ check that the subvol is 18474260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 18484260f7c7SSage Weil * otherwise be able to delete. 18494260f7c7SSage Weil * 18504260f7c7SSage Weil * Users who want to delete empty subvols should try 18514260f7c7SSage Weil * rmdir(2). 18524260f7c7SSage Weil */ 18534260f7c7SSage Weil err = -EPERM; 18544260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 18554260f7c7SSage Weil goto out_dput; 18564260f7c7SSage Weil 18574260f7c7SSage Weil /* 18584260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 18594260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 18604260f7c7SSage Weil * must be called on the dentry referencing the root 18614260f7c7SSage Weil * of the subvol, not a random directory contained 18624260f7c7SSage Weil * within it. 18634260f7c7SSage Weil */ 18644260f7c7SSage Weil err = -EINVAL; 18654260f7c7SSage Weil if (root == dest) 18664260f7c7SSage Weil goto out_dput; 18674260f7c7SSage Weil 18684260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 18694260f7c7SSage Weil if (err) 18704260f7c7SSage Weil goto out_dput; 18714260f7c7SSage Weil 18724260f7c7SSage Weil /* check if subvolume may be deleted by a non-root user */ 18734260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 18744260f7c7SSage Weil if (err) 18754260f7c7SSage Weil goto out_dput; 18764260f7c7SSage Weil } 18774260f7c7SSage Weil 187833345d01SLi Zefan if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { 187976dda93cSYan, Zheng err = -EINVAL; 188076dda93cSYan, Zheng goto out_dput; 188176dda93cSYan, Zheng } 188276dda93cSYan, Zheng 188376dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 188476dda93cSYan, Zheng err = d_invalidate(dentry); 188576dda93cSYan, Zheng if (err) 188676dda93cSYan, Zheng goto out_unlock; 188776dda93cSYan, Zheng 188876dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 188976dda93cSYan, Zheng 189076dda93cSYan, Zheng err = may_destroy_subvol(dest); 189176dda93cSYan, Zheng if (err) 189276dda93cSYan, Zheng goto out_up_write; 189376dda93cSYan, Zheng 1894a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 1895a22285a6SYan, Zheng if (IS_ERR(trans)) { 1896a22285a6SYan, Zheng err = PTR_ERR(trans); 1897d327099aSDan Carpenter goto out_up_write; 1898a22285a6SYan, Zheng } 1899a22285a6SYan, Zheng trans->block_rsv = &root->fs_info->global_block_rsv; 1900a22285a6SYan, Zheng 190176dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 190276dda93cSYan, Zheng dest->root_key.objectid, 190376dda93cSYan, Zheng dentry->d_name.name, 190476dda93cSYan, Zheng dentry->d_name.len); 190576dda93cSYan, Zheng BUG_ON(ret); 190676dda93cSYan, Zheng 190776dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 190876dda93cSYan, Zheng 190976dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 191076dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 191176dda93cSYan, Zheng dest->root_item.drop_level = 0; 191276dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 191376dda93cSYan, Zheng 1914d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 191576dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 191676dda93cSYan, Zheng root->fs_info->tree_root, 191776dda93cSYan, Zheng dest->root_key.objectid); 191876dda93cSYan, Zheng BUG_ON(ret); 1919d68fc57bSYan, Zheng } 192076dda93cSYan, Zheng 1921531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 192276dda93cSYan, Zheng BUG_ON(ret); 192376dda93cSYan, Zheng inode->i_flags |= S_DEAD; 192476dda93cSYan, Zheng out_up_write: 192576dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 192676dda93cSYan, Zheng out_unlock: 192776dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 192876dda93cSYan, Zheng if (!err) { 1929efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 193076dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 193176dda93cSYan, Zheng d_delete(dentry); 193276dda93cSYan, Zheng } 193376dda93cSYan, Zheng out_dput: 193476dda93cSYan, Zheng dput(dentry); 193576dda93cSYan, Zheng out_unlock_dir: 193676dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 193776dda93cSYan, Zheng mnt_drop_write(file->f_path.mnt); 193876dda93cSYan, Zheng out: 193976dda93cSYan, Zheng kfree(vol_args); 194076dda93cSYan, Zheng return err; 194176dda93cSYan, Zheng } 194276dda93cSYan, Zheng 19431e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 1944f46b5a66SChristoph Hellwig { 1945f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1946f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 19471e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 1948c146afadSYan Zheng int ret; 1949c146afadSYan Zheng 1950b83cc969SLi Zefan if (btrfs_root_readonly(root)) 1951b83cc969SLi Zefan return -EROFS; 1952b83cc969SLi Zefan 1953c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1954c146afadSYan Zheng if (ret) 1955c146afadSYan Zheng return ret; 1956f46b5a66SChristoph Hellwig 1957f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 1958f46b5a66SChristoph Hellwig case S_IFDIR: 1959e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 1960e441d54dSChris Mason ret = -EPERM; 1961e441d54dSChris Mason goto out; 1962e441d54dSChris Mason } 19638929ecfaSYan, Zheng ret = btrfs_defrag_root(root, 0); 19648929ecfaSYan, Zheng if (ret) 19658929ecfaSYan, Zheng goto out; 19668929ecfaSYan, Zheng ret = btrfs_defrag_root(root->fs_info->extent_root, 0); 1967f46b5a66SChristoph Hellwig break; 1968f46b5a66SChristoph Hellwig case S_IFREG: 1969e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 1970e441d54dSChris Mason ret = -EINVAL; 1971e441d54dSChris Mason goto out; 1972e441d54dSChris Mason } 19731e701a32SChris Mason 19741e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 19751e701a32SChris Mason if (!range) { 19761e701a32SChris Mason ret = -ENOMEM; 19771e701a32SChris Mason goto out; 19781e701a32SChris Mason } 19791e701a32SChris Mason 19801e701a32SChris Mason if (argp) { 19811e701a32SChris Mason if (copy_from_user(range, argp, 19821e701a32SChris Mason sizeof(*range))) { 19831e701a32SChris Mason ret = -EFAULT; 19841e701a32SChris Mason kfree(range); 1985683be16eSDan Carpenter goto out; 19861e701a32SChris Mason } 19871e701a32SChris Mason /* compression requires us to start the IO */ 19881e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 19891e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 19901e701a32SChris Mason range->extent_thresh = (u32)-1; 19911e701a32SChris Mason } 19921e701a32SChris Mason } else { 19931e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 19941e701a32SChris Mason range->len = (u64)-1; 19951e701a32SChris Mason } 19964cb5300bSChris Mason ret = btrfs_defrag_file(fdentry(file)->d_inode, file, 19974cb5300bSChris Mason range, 0, 0); 19984cb5300bSChris Mason if (ret > 0) 19994cb5300bSChris Mason ret = 0; 20001e701a32SChris Mason kfree(range); 2001f46b5a66SChristoph Hellwig break; 20028929ecfaSYan, Zheng default: 20038929ecfaSYan, Zheng ret = -EINVAL; 2004f46b5a66SChristoph Hellwig } 2005e441d54dSChris Mason out: 2006ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 2007e441d54dSChris Mason return ret; 2008f46b5a66SChristoph Hellwig } 2009f46b5a66SChristoph Hellwig 2010b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 2011f46b5a66SChristoph Hellwig { 2012f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2013f46b5a66SChristoph Hellwig int ret; 2014f46b5a66SChristoph Hellwig 2015e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2016e441d54dSChris Mason return -EPERM; 2017e441d54dSChris Mason 2018dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2019dae7b665SLi Zefan if (IS_ERR(vol_args)) 2020dae7b665SLi Zefan return PTR_ERR(vol_args); 2021f46b5a66SChristoph Hellwig 20225516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2023f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 2024f46b5a66SChristoph Hellwig 2025f46b5a66SChristoph Hellwig kfree(vol_args); 2026f46b5a66SChristoph Hellwig return ret; 2027f46b5a66SChristoph Hellwig } 2028f46b5a66SChristoph Hellwig 2029b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 2030f46b5a66SChristoph Hellwig { 2031f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2032f46b5a66SChristoph Hellwig int ret; 2033f46b5a66SChristoph Hellwig 2034e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2035e441d54dSChris Mason return -EPERM; 2036e441d54dSChris Mason 2037c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 2038c146afadSYan Zheng return -EROFS; 2039c146afadSYan Zheng 2040dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2041dae7b665SLi Zefan if (IS_ERR(vol_args)) 2042dae7b665SLi Zefan return PTR_ERR(vol_args); 2043f46b5a66SChristoph Hellwig 20445516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2045f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 2046f46b5a66SChristoph Hellwig 2047f46b5a66SChristoph Hellwig kfree(vol_args); 2048f46b5a66SChristoph Hellwig return ret; 2049f46b5a66SChristoph Hellwig } 2050f46b5a66SChristoph Hellwig 2051475f6387SJan Schmidt static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) 2052475f6387SJan Schmidt { 2053027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2054475f6387SJan Schmidt struct btrfs_device *device; 2055475f6387SJan Schmidt struct btrfs_device *next; 2056475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2057027ed2f0SLi Zefan int ret = 0; 2058475f6387SJan Schmidt 2059475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2060475f6387SJan Schmidt return -EPERM; 2061475f6387SJan Schmidt 2062027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 2063027ed2f0SLi Zefan if (!fi_args) 2064027ed2f0SLi Zefan return -ENOMEM; 2065027ed2f0SLi Zefan 2066027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2067027ed2f0SLi Zefan memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); 2068475f6387SJan Schmidt 2069475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2070475f6387SJan Schmidt list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { 2071027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2072027ed2f0SLi Zefan fi_args->max_id = device->devid; 2073475f6387SJan Schmidt } 2074475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2075475f6387SJan Schmidt 2076027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2077027ed2f0SLi Zefan ret = -EFAULT; 2078475f6387SJan Schmidt 2079027ed2f0SLi Zefan kfree(fi_args); 2080027ed2f0SLi Zefan return ret; 2081475f6387SJan Schmidt } 2082475f6387SJan Schmidt 2083475f6387SJan Schmidt static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 2084475f6387SJan Schmidt { 2085475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2086475f6387SJan Schmidt struct btrfs_device *dev; 2087475f6387SJan Schmidt struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 2088475f6387SJan Schmidt int ret = 0; 2089475f6387SJan Schmidt char *s_uuid = NULL; 2090475f6387SJan Schmidt char empty_uuid[BTRFS_UUID_SIZE] = {0}; 2091475f6387SJan Schmidt 2092475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2093475f6387SJan Schmidt return -EPERM; 2094475f6387SJan Schmidt 2095475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2096475f6387SJan Schmidt if (IS_ERR(di_args)) 2097475f6387SJan Schmidt return PTR_ERR(di_args); 2098475f6387SJan Schmidt 2099475f6387SJan Schmidt if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0) 2100475f6387SJan Schmidt s_uuid = di_args->uuid; 2101475f6387SJan Schmidt 2102475f6387SJan Schmidt mutex_lock(&fs_devices->device_list_mutex); 2103475f6387SJan Schmidt dev = btrfs_find_device(root, di_args->devid, s_uuid, NULL); 2104475f6387SJan Schmidt mutex_unlock(&fs_devices->device_list_mutex); 2105475f6387SJan Schmidt 2106475f6387SJan Schmidt if (!dev) { 2107475f6387SJan Schmidt ret = -ENODEV; 2108475f6387SJan Schmidt goto out; 2109475f6387SJan Schmidt } 2110475f6387SJan Schmidt 2111475f6387SJan Schmidt di_args->devid = dev->devid; 2112475f6387SJan Schmidt di_args->bytes_used = dev->bytes_used; 2113475f6387SJan Schmidt di_args->total_bytes = dev->total_bytes; 2114475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 2115475f6387SJan Schmidt strncpy(di_args->path, dev->name, sizeof(di_args->path)); 2116475f6387SJan Schmidt 2117475f6387SJan Schmidt out: 2118475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2119475f6387SJan Schmidt ret = -EFAULT; 2120475f6387SJan Schmidt 2121475f6387SJan Schmidt kfree(di_args); 2122475f6387SJan Schmidt return ret; 2123475f6387SJan Schmidt } 2124475f6387SJan Schmidt 212576dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 2126b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 2127f46b5a66SChristoph Hellwig { 2128f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2129f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2130f46b5a66SChristoph Hellwig struct file *src_file; 2131f46b5a66SChristoph Hellwig struct inode *src; 2132f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2133f46b5a66SChristoph Hellwig struct btrfs_path *path; 2134f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 2135ae01a0abSYan Zheng char *buf; 2136ae01a0abSYan Zheng struct btrfs_key key; 2137f46b5a66SChristoph Hellwig u32 nritems; 2138f46b5a66SChristoph Hellwig int slot; 2139ae01a0abSYan Zheng int ret; 2140c5c9cd4dSSage Weil u64 len = olen; 2141c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 2142c5c9cd4dSSage Weil u64 hint_byte; 2143d20f7043SChris Mason 2144c5c9cd4dSSage Weil /* 2145c5c9cd4dSSage Weil * TODO: 2146c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 2147c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 2148c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 2149c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 2150c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 2151c5c9cd4dSSage Weil * they don't overlap)? 2152c5c9cd4dSSage Weil */ 2153c5c9cd4dSSage Weil 2154e441d54dSChris Mason /* the destination must be opened for writing */ 21552ebc3464SDan Rosenberg if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 2156e441d54dSChris Mason return -EINVAL; 2157e441d54dSChris Mason 2158b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2159b83cc969SLi Zefan return -EROFS; 2160b83cc969SLi Zefan 2161c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 2162c146afadSYan Zheng if (ret) 2163c146afadSYan Zheng return ret; 2164c146afadSYan Zheng 2165c5c9cd4dSSage Weil src_file = fget(srcfd); 2166ab67b7c1SYan Zheng if (!src_file) { 2167ab67b7c1SYan Zheng ret = -EBADF; 2168ab67b7c1SYan Zheng goto out_drop_write; 2169ab67b7c1SYan Zheng } 21705dc64164SDan Rosenberg 2171f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 2172f46b5a66SChristoph Hellwig 2173c5c9cd4dSSage Weil ret = -EINVAL; 2174c5c9cd4dSSage Weil if (src == inode) 2175c5c9cd4dSSage Weil goto out_fput; 2176c5c9cd4dSSage Weil 21775dc64164SDan Rosenberg /* the src must be open for reading */ 21785dc64164SDan Rosenberg if (!(src_file->f_mode & FMODE_READ)) 21795dc64164SDan Rosenberg goto out_fput; 21805dc64164SDan Rosenberg 21810e7b824cSLi Zefan /* don't make the dst file partly checksummed */ 21820e7b824cSLi Zefan if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 21830e7b824cSLi Zefan (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 21840e7b824cSLi Zefan goto out_fput; 21850e7b824cSLi Zefan 2186ae01a0abSYan Zheng ret = -EISDIR; 2187ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 2188f46b5a66SChristoph Hellwig goto out_fput; 2189f46b5a66SChristoph Hellwig 2190ae01a0abSYan Zheng ret = -EXDEV; 2191ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 2192ae01a0abSYan Zheng goto out_fput; 2193ae01a0abSYan Zheng 2194ae01a0abSYan Zheng ret = -ENOMEM; 2195ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 2196ae01a0abSYan Zheng if (!buf) 2197ae01a0abSYan Zheng goto out_fput; 2198ae01a0abSYan Zheng 2199ae01a0abSYan Zheng path = btrfs_alloc_path(); 2200ae01a0abSYan Zheng if (!path) { 2201ae01a0abSYan Zheng vfree(buf); 2202ae01a0abSYan Zheng goto out_fput; 2203ae01a0abSYan Zheng } 2204ae01a0abSYan Zheng path->reada = 2; 2205ae01a0abSYan Zheng 2206f46b5a66SChristoph Hellwig if (inode < src) { 2207fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 2208fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 2209f46b5a66SChristoph Hellwig } else { 2210fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 2211fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 2212f46b5a66SChristoph Hellwig } 2213f46b5a66SChristoph Hellwig 2214c5c9cd4dSSage Weil /* determine range to clone */ 2215c5c9cd4dSSage Weil ret = -EINVAL; 22162ebc3464SDan Rosenberg if (off + len > src->i_size || off + len < off) 2217f46b5a66SChristoph Hellwig goto out_unlock; 2218c5c9cd4dSSage Weil if (len == 0) 2219c5c9cd4dSSage Weil olen = len = src->i_size - off; 2220c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 2221c5c9cd4dSSage Weil if (off + len == src->i_size) 22222a6b8daeSLi Zefan len = ALIGN(src->i_size, bs) - off; 2223c5c9cd4dSSage Weil 2224c5c9cd4dSSage Weil /* verify the end result is block aligned */ 22252a6b8daeSLi Zefan if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 22262a6b8daeSLi Zefan !IS_ALIGNED(destoff, bs)) 2227c5c9cd4dSSage Weil goto out_unlock; 2228c5c9cd4dSSage Weil 2229d525e8abSLi Zefan if (destoff > inode->i_size) { 2230d525e8abSLi Zefan ret = btrfs_cont_expand(inode, inode->i_size, destoff); 2231d525e8abSLi Zefan if (ret) 2232d525e8abSLi Zefan goto out_unlock; 2233d525e8abSLi Zefan } 2234d525e8abSLi Zefan 223571ef0786SLi Zefan /* truncate page cache pages from target inode range */ 223671ef0786SLi Zefan truncate_inode_pages_range(&inode->i_data, destoff, 223771ef0786SLi Zefan PAGE_CACHE_ALIGN(destoff + len) - 1); 223871ef0786SLi Zefan 2239f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 2240f46b5a66SChristoph Hellwig another, and lock file content */ 2241f46b5a66SChristoph Hellwig while (1) { 224231840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 2243c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 22449a019196SSage Weil ordered = btrfs_lookup_first_ordered_extent(src, off+len); 22459a019196SSage Weil if (!ordered && 22469a019196SSage Weil !test_range_bit(&BTRFS_I(src)->io_tree, off, off+len, 22479a019196SSage Weil EXTENT_DELALLOC, 0, NULL)) 2248f46b5a66SChristoph Hellwig break; 2249c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 2250ae01a0abSYan Zheng if (ordered) 2251ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 22529a019196SSage Weil btrfs_wait_ordered_range(src, off, len); 2253f46b5a66SChristoph Hellwig } 2254f46b5a66SChristoph Hellwig 2255c5c9cd4dSSage Weil /* clone data */ 225633345d01SLi Zefan key.objectid = btrfs_ino(src); 2257ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 2258ae01a0abSYan Zheng key.offset = 0; 2259f46b5a66SChristoph Hellwig 2260f46b5a66SChristoph Hellwig while (1) { 2261f46b5a66SChristoph Hellwig /* 2262f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 2263f46b5a66SChristoph Hellwig * tree. 2264f46b5a66SChristoph Hellwig */ 2265a22285a6SYan, Zheng ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 2266f46b5a66SChristoph Hellwig if (ret < 0) 2267f46b5a66SChristoph Hellwig goto out; 2268f46b5a66SChristoph Hellwig 2269ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2270ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 2271f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 2272f46b5a66SChristoph Hellwig if (ret < 0) 2273f46b5a66SChristoph Hellwig goto out; 2274f46b5a66SChristoph Hellwig if (ret > 0) 2275f46b5a66SChristoph Hellwig break; 2276ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 2277f46b5a66SChristoph Hellwig } 2278f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 2279f46b5a66SChristoph Hellwig slot = path->slots[0]; 2280f46b5a66SChristoph Hellwig 2281ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 2282d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 228333345d01SLi Zefan key.objectid != btrfs_ino(src)) 2284f46b5a66SChristoph Hellwig break; 2285f46b5a66SChristoph Hellwig 2286c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 2287c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 2288c5c9cd4dSSage Weil int type; 228931840ae1SZheng Yan u32 size; 229031840ae1SZheng Yan struct btrfs_key new_key; 2291c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 2292c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 2293c5c9cd4dSSage Weil u8 comp; 2294b5384d48SSage Weil u64 endoff; 229531840ae1SZheng Yan 229631840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 229731840ae1SZheng Yan read_extent_buffer(leaf, buf, 229831840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 229931840ae1SZheng Yan size); 2300c5c9cd4dSSage Weil 2301c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 2302c5c9cd4dSSage Weil struct btrfs_file_extent_item); 2303c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 2304c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 2305c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2306c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2307d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 2308d397712bSChris Mason extent); 2309d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 2310d397712bSChris Mason extent); 2311c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 2312d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 2313d397712bSChris Mason extent); 2314c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2315c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 2316c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 2317c5c9cd4dSSage Weil extent); 2318c5c9cd4dSSage Weil } 2319b3b4aa74SDavid Sterba btrfs_release_path(path); 232031840ae1SZheng Yan 2321050006a7SSage Weil if (key.offset + datal <= off || 2322c5c9cd4dSSage Weil key.offset >= off+len) 2323c5c9cd4dSSage Weil goto next; 2324c5c9cd4dSSage Weil 232531840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 232633345d01SLi Zefan new_key.objectid = btrfs_ino(inode); 23274d728ec7SLi Zefan if (off <= key.offset) 2328c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 23294d728ec7SLi Zefan else 23304d728ec7SLi Zefan new_key.offset = destoff; 2331c5c9cd4dSSage Weil 2332b6f3409bSSage Weil /* 2333b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 2334b6f3409bSSage Weil * 1 - add new extent 2335b6f3409bSSage Weil * 1 - inode update 2336b6f3409bSSage Weil */ 2337b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 2338a22285a6SYan, Zheng if (IS_ERR(trans)) { 2339a22285a6SYan, Zheng ret = PTR_ERR(trans); 2340a22285a6SYan, Zheng goto out; 2341a22285a6SYan, Zheng } 2342a22285a6SYan, Zheng 2343c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2344c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2345d72c0842SLi Zefan /* 2346d72c0842SLi Zefan * a | --- range to clone ---| b 2347d72c0842SLi Zefan * | ------------- extent ------------- | 2348d72c0842SLi Zefan */ 2349d72c0842SLi Zefan 2350d72c0842SLi Zefan /* substract range b */ 2351d72c0842SLi Zefan if (key.offset + datal > off + len) 2352d72c0842SLi Zefan datal = off + len - key.offset; 2353d72c0842SLi Zefan 2354d72c0842SLi Zefan /* substract range a */ 2355a22285a6SYan, Zheng if (off > key.offset) { 2356a22285a6SYan, Zheng datao += off - key.offset; 2357a22285a6SYan, Zheng datal -= off - key.offset; 2358a22285a6SYan, Zheng } 2359a22285a6SYan, Zheng 2360a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 2361a22285a6SYan, Zheng new_key.offset, 2362a22285a6SYan, Zheng new_key.offset + datal, 2363a22285a6SYan, Zheng &hint_byte, 1); 2364a22285a6SYan, Zheng BUG_ON(ret); 2365a22285a6SYan, Zheng 236631840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 236731840ae1SZheng Yan &new_key, size); 2368a22285a6SYan, Zheng BUG_ON(ret); 236931840ae1SZheng Yan 237031840ae1SZheng Yan leaf = path->nodes[0]; 237131840ae1SZheng Yan slot = path->slots[0]; 237231840ae1SZheng Yan write_extent_buffer(leaf, buf, 237331840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 237431840ae1SZheng Yan size); 2375ae01a0abSYan Zheng 2376f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 2377f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 2378c5c9cd4dSSage Weil 2379c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 2380c5c9cd4dSSage Weil if (!disko) 2381c5c9cd4dSSage Weil datao = 0; 2382c5c9cd4dSSage Weil 2383c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 2384c5c9cd4dSSage Weil datao); 2385c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 2386c5c9cd4dSSage Weil datal); 2387c5c9cd4dSSage Weil if (disko) { 2388c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2389ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 23905d4f98a2SYan Zheng disko, diskl, 0, 2391f46b5a66SChristoph Hellwig root->root_key.objectid, 239233345d01SLi Zefan btrfs_ino(inode), 23935d4f98a2SYan Zheng new_key.offset - datao); 2394ae01a0abSYan Zheng BUG_ON(ret); 2395f46b5a66SChristoph Hellwig } 2396c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2397c5c9cd4dSSage Weil u64 skip = 0; 2398c5c9cd4dSSage Weil u64 trim = 0; 2399c5c9cd4dSSage Weil if (off > key.offset) { 2400c5c9cd4dSSage Weil skip = off - key.offset; 2401c5c9cd4dSSage Weil new_key.offset += skip; 240231840ae1SZheng Yan } 2403d397712bSChris Mason 2404c5c9cd4dSSage Weil if (key.offset + datal > off+len) 2405c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 2406d397712bSChris Mason 2407c5c9cd4dSSage Weil if (comp && (skip || trim)) { 2408c5c9cd4dSSage Weil ret = -EINVAL; 2409a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 2410c5c9cd4dSSage Weil goto out; 241131840ae1SZheng Yan } 2412c5c9cd4dSSage Weil size -= skip + trim; 2413c5c9cd4dSSage Weil datal -= skip + trim; 2414a22285a6SYan, Zheng 2415a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 2416a22285a6SYan, Zheng new_key.offset, 2417a22285a6SYan, Zheng new_key.offset + datal, 2418a22285a6SYan, Zheng &hint_byte, 1); 2419a22285a6SYan, Zheng BUG_ON(ret); 2420a22285a6SYan, Zheng 2421c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 2422c5c9cd4dSSage Weil &new_key, size); 2423a22285a6SYan, Zheng BUG_ON(ret); 2424c5c9cd4dSSage Weil 2425c5c9cd4dSSage Weil if (skip) { 2426d397712bSChris Mason u32 start = 2427d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 2428c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 2429c5c9cd4dSSage Weil datal); 2430c5c9cd4dSSage Weil } 2431c5c9cd4dSSage Weil 2432c5c9cd4dSSage Weil leaf = path->nodes[0]; 2433c5c9cd4dSSage Weil slot = path->slots[0]; 2434c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 2435c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 2436c5c9cd4dSSage Weil size); 2437c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2438c5c9cd4dSSage Weil } 2439c5c9cd4dSSage Weil 2440c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 2441b3b4aa74SDavid Sterba btrfs_release_path(path); 2442c5c9cd4dSSage Weil 2443a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 2444b5384d48SSage Weil 2445b5384d48SSage Weil /* 2446b5384d48SSage Weil * we round up to the block size at eof when 2447b5384d48SSage Weil * determining which extents to clone above, 2448b5384d48SSage Weil * but shouldn't round up the file size 2449b5384d48SSage Weil */ 2450b5384d48SSage Weil endoff = new_key.offset + datal; 24515f3888ffSLi Zefan if (endoff > destoff+olen) 24525f3888ffSLi Zefan endoff = destoff+olen; 2453b5384d48SSage Weil if (endoff > inode->i_size) 2454b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 2455b5384d48SSage Weil 2456a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 2457a22285a6SYan, Zheng BUG_ON(ret); 2458a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 2459a22285a6SYan, Zheng } 2460c5c9cd4dSSage Weil next: 2461b3b4aa74SDavid Sterba btrfs_release_path(path); 2462ae01a0abSYan Zheng key.offset++; 2463ae01a0abSYan Zheng } 2464f46b5a66SChristoph Hellwig ret = 0; 2465f46b5a66SChristoph Hellwig out: 2466b3b4aa74SDavid Sterba btrfs_release_path(path); 2467c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 2468f46b5a66SChristoph Hellwig out_unlock: 2469f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 2470f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 2471ae01a0abSYan Zheng vfree(buf); 2472ae01a0abSYan Zheng btrfs_free_path(path); 2473f46b5a66SChristoph Hellwig out_fput: 2474f46b5a66SChristoph Hellwig fput(src_file); 2475ab67b7c1SYan Zheng out_drop_write: 2476ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 2477f46b5a66SChristoph Hellwig return ret; 2478f46b5a66SChristoph Hellwig } 2479f46b5a66SChristoph Hellwig 24807a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 2481c5c9cd4dSSage Weil { 2482c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 2483c5c9cd4dSSage Weil 24847a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 2485c5c9cd4dSSage Weil return -EFAULT; 2486c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 2487c5c9cd4dSSage Weil args.src_length, args.dest_offset); 2488c5c9cd4dSSage Weil } 2489c5c9cd4dSSage Weil 2490f46b5a66SChristoph Hellwig /* 2491f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2492f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2493f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2494f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2495f46b5a66SChristoph Hellwig */ 2496b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 2497f46b5a66SChristoph Hellwig { 2498f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2499f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2500f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 25011ab86aedSSage Weil int ret; 2502f46b5a66SChristoph Hellwig 25031ab86aedSSage Weil ret = -EPERM; 2504df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 2505f46b5a66SChristoph Hellwig goto out; 25061ab86aedSSage Weil 25071ab86aedSSage Weil ret = -EINPROGRESS; 25081ab86aedSSage Weil if (file->private_data) 25091ab86aedSSage Weil goto out; 25109ca9ee09SSage Weil 2511b83cc969SLi Zefan ret = -EROFS; 2512b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2513b83cc969SLi Zefan goto out; 2514b83cc969SLi Zefan 2515c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 2516c146afadSYan Zheng if (ret) 2517c146afadSYan Zheng goto out; 2518c146afadSYan Zheng 2519a4abeea4SJosef Bacik atomic_inc(&root->fs_info->open_ioctl_trans); 25209ca9ee09SSage Weil 2521f46b5a66SChristoph Hellwig ret = -ENOMEM; 25227a7eaa40SJosef Bacik trans = btrfs_start_ioctl_transaction(root); 2523abd30bb0STsutomu Itoh if (IS_ERR(trans)) 25241ab86aedSSage Weil goto out_drop; 25251ab86aedSSage Weil 25261ab86aedSSage Weil file->private_data = trans; 25271ab86aedSSage Weil return 0; 25281ab86aedSSage Weil 25291ab86aedSSage Weil out_drop: 2530a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 25311ab86aedSSage Weil mnt_drop_write(file->f_path.mnt); 2532f46b5a66SChristoph Hellwig out: 2533f46b5a66SChristoph Hellwig return ret; 2534f46b5a66SChristoph Hellwig } 2535f46b5a66SChristoph Hellwig 25366ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 25376ef5ed0dSJosef Bacik { 25386ef5ed0dSJosef Bacik struct inode *inode = fdentry(file)->d_inode; 25396ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 25406ef5ed0dSJosef Bacik struct btrfs_root *new_root; 25416ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 25426ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 25436ef5ed0dSJosef Bacik struct btrfs_path *path; 25446ef5ed0dSJosef Bacik struct btrfs_key location; 25456ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 25466ef5ed0dSJosef Bacik struct btrfs_super_block *disk_super; 25476ef5ed0dSJosef Bacik u64 features; 25486ef5ed0dSJosef Bacik u64 objectid = 0; 25496ef5ed0dSJosef Bacik u64 dir_id; 25506ef5ed0dSJosef Bacik 25516ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 25526ef5ed0dSJosef Bacik return -EPERM; 25536ef5ed0dSJosef Bacik 25546ef5ed0dSJosef Bacik if (copy_from_user(&objectid, argp, sizeof(objectid))) 25556ef5ed0dSJosef Bacik return -EFAULT; 25566ef5ed0dSJosef Bacik 25576ef5ed0dSJosef Bacik if (!objectid) 25586ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 25596ef5ed0dSJosef Bacik 25606ef5ed0dSJosef Bacik location.objectid = objectid; 25616ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 25626ef5ed0dSJosef Bacik location.offset = (u64)-1; 25636ef5ed0dSJosef Bacik 25646ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 25656ef5ed0dSJosef Bacik if (IS_ERR(new_root)) 25666ef5ed0dSJosef Bacik return PTR_ERR(new_root); 25676ef5ed0dSJosef Bacik 25686ef5ed0dSJosef Bacik if (btrfs_root_refs(&new_root->root_item) == 0) 25696ef5ed0dSJosef Bacik return -ENOENT; 25706ef5ed0dSJosef Bacik 25716ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 25726ef5ed0dSJosef Bacik if (!path) 25736ef5ed0dSJosef Bacik return -ENOMEM; 25746ef5ed0dSJosef Bacik path->leave_spinning = 1; 25756ef5ed0dSJosef Bacik 25766ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 257798d5dc13STsutomu Itoh if (IS_ERR(trans)) { 25786ef5ed0dSJosef Bacik btrfs_free_path(path); 257998d5dc13STsutomu Itoh return PTR_ERR(trans); 25806ef5ed0dSJosef Bacik } 25816ef5ed0dSJosef Bacik 25826ef5ed0dSJosef Bacik dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); 25836ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 25846ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 2585cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 25866ef5ed0dSJosef Bacik btrfs_free_path(path); 25876ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 25886ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 25896ef5ed0dSJosef Bacik "this isn't going to work\n"); 25906ef5ed0dSJosef Bacik return -ENOENT; 25916ef5ed0dSJosef Bacik } 25926ef5ed0dSJosef Bacik 25936ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 25946ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 25956ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 25966ef5ed0dSJosef Bacik btrfs_free_path(path); 25976ef5ed0dSJosef Bacik 25986ef5ed0dSJosef Bacik disk_super = &root->fs_info->super_copy; 25996ef5ed0dSJosef Bacik features = btrfs_super_incompat_flags(disk_super); 26006ef5ed0dSJosef Bacik if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { 26016ef5ed0dSJosef Bacik features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; 26026ef5ed0dSJosef Bacik btrfs_set_super_incompat_flags(disk_super, features); 26036ef5ed0dSJosef Bacik } 26046ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 26056ef5ed0dSJosef Bacik 26066ef5ed0dSJosef Bacik return 0; 26076ef5ed0dSJosef Bacik } 26086ef5ed0dSJosef Bacik 2609bf5fc093SJosef Bacik static void get_block_group_info(struct list_head *groups_list, 2610bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 2611bf5fc093SJosef Bacik { 2612bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 2613bf5fc093SJosef Bacik 2614bf5fc093SJosef Bacik space->total_bytes = 0; 2615bf5fc093SJosef Bacik space->used_bytes = 0; 2616bf5fc093SJosef Bacik space->flags = 0; 2617bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 2618bf5fc093SJosef Bacik space->flags = block_group->flags; 2619bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 2620bf5fc093SJosef Bacik space->used_bytes += 2621bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 2622bf5fc093SJosef Bacik } 2623bf5fc093SJosef Bacik } 2624bf5fc093SJosef Bacik 26251406e432SJosef Bacik long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 26261406e432SJosef Bacik { 26271406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 26281406e432SJosef Bacik struct btrfs_ioctl_space_info space; 26291406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 26307fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 263113f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 26321406e432SJosef Bacik struct btrfs_space_info *info; 2633bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 2634bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 2635bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 2636bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 2637bf5fc093SJosef Bacik int num_types = 4; 26387fde62bfSChris Mason int alloc_size; 26391406e432SJosef Bacik int ret = 0; 264051788b1bSDan Rosenberg u64 slot_count = 0; 2641bf5fc093SJosef Bacik int i, c; 26421406e432SJosef Bacik 26431406e432SJosef Bacik if (copy_from_user(&space_args, 26441406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 26451406e432SJosef Bacik sizeof(space_args))) 26461406e432SJosef Bacik return -EFAULT; 26471406e432SJosef Bacik 2648bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2649bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2650bf5fc093SJosef Bacik 2651bf5fc093SJosef Bacik info = NULL; 26527fde62bfSChris Mason rcu_read_lock(); 2653bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2654bf5fc093SJosef Bacik list) { 2655bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2656bf5fc093SJosef Bacik info = tmp; 2657bf5fc093SJosef Bacik break; 2658bf5fc093SJosef Bacik } 2659bf5fc093SJosef Bacik } 26607fde62bfSChris Mason rcu_read_unlock(); 26611406e432SJosef Bacik 2662bf5fc093SJosef Bacik if (!info) 2663bf5fc093SJosef Bacik continue; 2664bf5fc093SJosef Bacik 2665bf5fc093SJosef Bacik down_read(&info->groups_sem); 2666bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2667bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 2668bf5fc093SJosef Bacik slot_count++; 2669bf5fc093SJosef Bacik } 2670bf5fc093SJosef Bacik up_read(&info->groups_sem); 2671bf5fc093SJosef Bacik } 2672bf5fc093SJosef Bacik 26737fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 26747fde62bfSChris Mason if (space_args.space_slots == 0) { 26757fde62bfSChris Mason space_args.total_spaces = slot_count; 26767fde62bfSChris Mason goto out; 26777fde62bfSChris Mason } 2678bf5fc093SJosef Bacik 267951788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 2680bf5fc093SJosef Bacik 26817fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 2682bf5fc093SJosef Bacik 26837fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 26847fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 26857fde62bfSChris Mason */ 26867fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 26877fde62bfSChris Mason return -ENOMEM; 26887fde62bfSChris Mason 26897fde62bfSChris Mason space_args.total_spaces = 0; 26907fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 26917fde62bfSChris Mason if (!dest) 26927fde62bfSChris Mason return -ENOMEM; 26937fde62bfSChris Mason dest_orig = dest; 26947fde62bfSChris Mason 26957fde62bfSChris Mason /* now we have a buffer to copy into */ 2696bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2697bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2698bf5fc093SJosef Bacik 269951788b1bSDan Rosenberg if (!slot_count) 270051788b1bSDan Rosenberg break; 270151788b1bSDan Rosenberg 2702bf5fc093SJosef Bacik info = NULL; 27031406e432SJosef Bacik rcu_read_lock(); 2704bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2705bf5fc093SJosef Bacik list) { 2706bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2707bf5fc093SJosef Bacik info = tmp; 27087fde62bfSChris Mason break; 2709bf5fc093SJosef Bacik } 2710bf5fc093SJosef Bacik } 2711bf5fc093SJosef Bacik rcu_read_unlock(); 27127fde62bfSChris Mason 2713bf5fc093SJosef Bacik if (!info) 2714bf5fc093SJosef Bacik continue; 2715bf5fc093SJosef Bacik down_read(&info->groups_sem); 2716bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2717bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 2718bf5fc093SJosef Bacik get_block_group_info(&info->block_groups[c], 2719bf5fc093SJosef Bacik &space); 27207fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 27211406e432SJosef Bacik dest++; 27221406e432SJosef Bacik space_args.total_spaces++; 272351788b1bSDan Rosenberg slot_count--; 27241406e432SJosef Bacik } 272551788b1bSDan Rosenberg if (!slot_count) 272651788b1bSDan Rosenberg break; 2727bf5fc093SJosef Bacik } 2728bf5fc093SJosef Bacik up_read(&info->groups_sem); 2729bf5fc093SJosef Bacik } 27301406e432SJosef Bacik 27317fde62bfSChris Mason user_dest = (struct btrfs_ioctl_space_info *) 27327fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 27337fde62bfSChris Mason 27347fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 27357fde62bfSChris Mason ret = -EFAULT; 27367fde62bfSChris Mason 27377fde62bfSChris Mason kfree(dest_orig); 27387fde62bfSChris Mason out: 27397fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 27401406e432SJosef Bacik ret = -EFAULT; 27411406e432SJosef Bacik 27421406e432SJosef Bacik return ret; 27431406e432SJosef Bacik } 27441406e432SJosef Bacik 2745f46b5a66SChristoph Hellwig /* 2746f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2747f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2748f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2749f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2750f46b5a66SChristoph Hellwig */ 2751f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 2752f46b5a66SChristoph Hellwig { 2753f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2754f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2755f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2756f46b5a66SChristoph Hellwig 2757f46b5a66SChristoph Hellwig trans = file->private_data; 27581ab86aedSSage Weil if (!trans) 27591ab86aedSSage Weil return -EINVAL; 2760b214107eSChristoph Hellwig file->private_data = NULL; 27619ca9ee09SSage Weil 27621ab86aedSSage Weil btrfs_end_transaction(trans, root); 27631ab86aedSSage Weil 2764a4abeea4SJosef Bacik atomic_dec(&root->fs_info->open_ioctl_trans); 27659ca9ee09SSage Weil 2766cfc8ea87SSage Weil mnt_drop_write(file->f_path.mnt); 27671ab86aedSSage Weil return 0; 2768f46b5a66SChristoph Hellwig } 2769f46b5a66SChristoph Hellwig 277046204592SSage Weil static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp) 277146204592SSage Weil { 277246204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 277346204592SSage Weil struct btrfs_trans_handle *trans; 277446204592SSage Weil u64 transid; 2775db5b493aSTsutomu Itoh int ret; 277646204592SSage Weil 277746204592SSage Weil trans = btrfs_start_transaction(root, 0); 277898d5dc13STsutomu Itoh if (IS_ERR(trans)) 277998d5dc13STsutomu Itoh return PTR_ERR(trans); 278046204592SSage Weil transid = trans->transid; 2781db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 27828b2b2d3cSTsutomu Itoh if (ret) { 27838b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 2784db5b493aSTsutomu Itoh return ret; 27858b2b2d3cSTsutomu Itoh } 278646204592SSage Weil 278746204592SSage Weil if (argp) 278846204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 278946204592SSage Weil return -EFAULT; 279046204592SSage Weil return 0; 279146204592SSage Weil } 279246204592SSage Weil 279346204592SSage Weil static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) 279446204592SSage Weil { 279546204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 279646204592SSage Weil u64 transid; 279746204592SSage Weil 279846204592SSage Weil if (argp) { 279946204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 280046204592SSage Weil return -EFAULT; 280146204592SSage Weil } else { 280246204592SSage Weil transid = 0; /* current trans */ 280346204592SSage Weil } 280446204592SSage Weil return btrfs_wait_for_commit(root, transid); 280546204592SSage Weil } 280646204592SSage Weil 2807475f6387SJan Schmidt static long btrfs_ioctl_scrub(struct btrfs_root *root, void __user *arg) 2808475f6387SJan Schmidt { 2809475f6387SJan Schmidt int ret; 2810475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 2811475f6387SJan Schmidt 2812475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2813475f6387SJan Schmidt return -EPERM; 2814475f6387SJan Schmidt 2815475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 2816475f6387SJan Schmidt if (IS_ERR(sa)) 2817475f6387SJan Schmidt return PTR_ERR(sa); 2818475f6387SJan Schmidt 2819475f6387SJan Schmidt ret = btrfs_scrub_dev(root, sa->devid, sa->start, sa->end, 28208628764eSArne Jansen &sa->progress, sa->flags & BTRFS_SCRUB_READONLY); 2821475f6387SJan Schmidt 2822475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 2823475f6387SJan Schmidt ret = -EFAULT; 2824475f6387SJan Schmidt 2825475f6387SJan Schmidt kfree(sa); 2826475f6387SJan Schmidt return ret; 2827475f6387SJan Schmidt } 2828475f6387SJan Schmidt 2829475f6387SJan Schmidt static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) 2830475f6387SJan Schmidt { 2831475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2832475f6387SJan Schmidt return -EPERM; 2833475f6387SJan Schmidt 2834475f6387SJan Schmidt return btrfs_scrub_cancel(root); 2835475f6387SJan Schmidt } 2836475f6387SJan Schmidt 2837475f6387SJan Schmidt static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 2838475f6387SJan Schmidt void __user *arg) 2839475f6387SJan Schmidt { 2840475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 2841475f6387SJan Schmidt int ret; 2842475f6387SJan Schmidt 2843475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2844475f6387SJan Schmidt return -EPERM; 2845475f6387SJan Schmidt 2846475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 2847475f6387SJan Schmidt if (IS_ERR(sa)) 2848475f6387SJan Schmidt return PTR_ERR(sa); 2849475f6387SJan Schmidt 2850475f6387SJan Schmidt ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); 2851475f6387SJan Schmidt 2852475f6387SJan Schmidt if (copy_to_user(arg, sa, sizeof(*sa))) 2853475f6387SJan Schmidt ret = -EFAULT; 2854475f6387SJan Schmidt 2855475f6387SJan Schmidt kfree(sa); 2856475f6387SJan Schmidt return ret; 2857475f6387SJan Schmidt } 2858475f6387SJan Schmidt 2859d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 2860d7728c96SJan Schmidt { 2861d7728c96SJan Schmidt int ret = 0; 2862d7728c96SJan Schmidt int i; 2863d7728c96SJan Schmidt unsigned long rel_ptr; 2864d7728c96SJan Schmidt int size; 2865d7728c96SJan Schmidt struct btrfs_ioctl_ino_path_args *ipa; 2866d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 2867d7728c96SJan Schmidt struct btrfs_path *path; 2868d7728c96SJan Schmidt 2869d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2870d7728c96SJan Schmidt return -EPERM; 2871d7728c96SJan Schmidt 2872d7728c96SJan Schmidt path = btrfs_alloc_path(); 2873d7728c96SJan Schmidt if (!path) { 2874d7728c96SJan Schmidt ret = -ENOMEM; 2875d7728c96SJan Schmidt goto out; 2876d7728c96SJan Schmidt } 2877d7728c96SJan Schmidt 2878d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 2879d7728c96SJan Schmidt if (IS_ERR(ipa)) { 2880d7728c96SJan Schmidt ret = PTR_ERR(ipa); 2881d7728c96SJan Schmidt ipa = NULL; 2882d7728c96SJan Schmidt goto out; 2883d7728c96SJan Schmidt } 2884d7728c96SJan Schmidt 2885d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 2886d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 2887d7728c96SJan Schmidt if (IS_ERR(ipath)) { 2888d7728c96SJan Schmidt ret = PTR_ERR(ipath); 2889d7728c96SJan Schmidt ipath = NULL; 2890d7728c96SJan Schmidt goto out; 2891d7728c96SJan Schmidt } 2892d7728c96SJan Schmidt 2893d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 2894d7728c96SJan Schmidt if (ret < 0) 2895d7728c96SJan Schmidt goto out; 2896d7728c96SJan Schmidt 2897d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 2898d7728c96SJan Schmidt rel_ptr = ipath->fspath->str[i] - (char *)ipath->fspath->str; 2899d7728c96SJan Schmidt ipath->fspath->str[i] = (void *)rel_ptr; 2900d7728c96SJan Schmidt } 2901d7728c96SJan Schmidt 2902d7728c96SJan Schmidt ret = copy_to_user(ipa->fspath, ipath->fspath, size); 2903d7728c96SJan Schmidt if (ret) { 2904d7728c96SJan Schmidt ret = -EFAULT; 2905d7728c96SJan Schmidt goto out; 2906d7728c96SJan Schmidt } 2907d7728c96SJan Schmidt 2908d7728c96SJan Schmidt out: 2909d7728c96SJan Schmidt btrfs_free_path(path); 2910d7728c96SJan Schmidt free_ipath(ipath); 2911d7728c96SJan Schmidt kfree(ipa); 2912d7728c96SJan Schmidt 2913d7728c96SJan Schmidt return ret; 2914d7728c96SJan Schmidt } 2915d7728c96SJan Schmidt 2916d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 2917d7728c96SJan Schmidt { 2918d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 2919d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 2920d7728c96SJan Schmidt 2921d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 2922d7728c96SJan Schmidt inodes->bytes_left -= c; 2923d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 2924d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 2925d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 2926d7728c96SJan Schmidt inodes->elem_cnt += 3; 2927d7728c96SJan Schmidt } else { 2928d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 2929d7728c96SJan Schmidt inodes->bytes_left = 0; 2930d7728c96SJan Schmidt inodes->elem_missed += 3; 2931d7728c96SJan Schmidt } 2932d7728c96SJan Schmidt 2933d7728c96SJan Schmidt return 0; 2934d7728c96SJan Schmidt } 2935d7728c96SJan Schmidt 2936d7728c96SJan Schmidt static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, 2937d7728c96SJan Schmidt void __user *arg) 2938d7728c96SJan Schmidt { 2939d7728c96SJan Schmidt int ret = 0; 2940d7728c96SJan Schmidt int size; 2941d7728c96SJan Schmidt u64 extent_offset; 2942d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 2943d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 2944d7728c96SJan Schmidt struct btrfs_path *path = NULL; 2945d7728c96SJan Schmidt struct btrfs_key key; 2946d7728c96SJan Schmidt 2947d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 2948d7728c96SJan Schmidt return -EPERM; 2949d7728c96SJan Schmidt 2950d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 2951d7728c96SJan Schmidt if (IS_ERR(loi)) { 2952d7728c96SJan Schmidt ret = PTR_ERR(loi); 2953d7728c96SJan Schmidt loi = NULL; 2954d7728c96SJan Schmidt goto out; 2955d7728c96SJan Schmidt } 2956d7728c96SJan Schmidt 2957d7728c96SJan Schmidt path = btrfs_alloc_path(); 2958d7728c96SJan Schmidt if (!path) { 2959d7728c96SJan Schmidt ret = -ENOMEM; 2960d7728c96SJan Schmidt goto out; 2961d7728c96SJan Schmidt } 2962d7728c96SJan Schmidt 2963d7728c96SJan Schmidt size = min_t(u32, loi->size, 4096); 2964d7728c96SJan Schmidt inodes = init_data_container(size); 2965d7728c96SJan Schmidt if (IS_ERR(inodes)) { 2966d7728c96SJan Schmidt ret = PTR_ERR(inodes); 2967d7728c96SJan Schmidt inodes = NULL; 2968d7728c96SJan Schmidt goto out; 2969d7728c96SJan Schmidt } 2970d7728c96SJan Schmidt 2971d7728c96SJan Schmidt ret = extent_from_logical(root->fs_info, loi->logical, path, &key); 2972d7728c96SJan Schmidt 2973d7728c96SJan Schmidt if (ret & BTRFS_EXTENT_FLAG_TREE_BLOCK) 2974d7728c96SJan Schmidt ret = -ENOENT; 2975d7728c96SJan Schmidt if (ret < 0) 2976d7728c96SJan Schmidt goto out; 2977d7728c96SJan Schmidt 2978d7728c96SJan Schmidt extent_offset = loi->logical - key.objectid; 2979d7728c96SJan Schmidt ret = iterate_extent_inodes(root->fs_info, path, key.objectid, 2980d7728c96SJan Schmidt extent_offset, build_ino_list, inodes); 2981d7728c96SJan Schmidt 2982d7728c96SJan Schmidt if (ret < 0) 2983d7728c96SJan Schmidt goto out; 2984d7728c96SJan Schmidt 2985d7728c96SJan Schmidt ret = copy_to_user(loi->inodes, inodes, size); 2986d7728c96SJan Schmidt if (ret) 2987d7728c96SJan Schmidt ret = -EFAULT; 2988d7728c96SJan Schmidt 2989d7728c96SJan Schmidt out: 2990d7728c96SJan Schmidt btrfs_free_path(path); 2991d7728c96SJan Schmidt kfree(inodes); 2992d7728c96SJan Schmidt kfree(loi); 2993d7728c96SJan Schmidt 2994d7728c96SJan Schmidt return ret; 2995d7728c96SJan Schmidt } 2996d7728c96SJan Schmidt 2997f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 2998f46b5a66SChristoph Hellwig cmd, unsigned long arg) 2999f46b5a66SChristoph Hellwig { 3000f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 30014bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 3002f46b5a66SChristoph Hellwig 3003f46b5a66SChristoph Hellwig switch (cmd) { 30046cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 30056cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 30066cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 30076cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 30086cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 30096cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 3010f7039b1dSLi Dongyang case FITRIM: 3011f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 3012f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 3013fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 3014fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 3015fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 30163de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 3017fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 301876dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 301976dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 30200caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 30210caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 30220caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 30230caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 30246ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 30256ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 3026f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 30271e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 30281e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 30291e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 3030f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 30314bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 3032f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 30334bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 3034f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 30354bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 3036475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 3037475f6387SJan Schmidt return btrfs_ioctl_fs_info(root, argp); 3038475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 3039475f6387SJan Schmidt return btrfs_ioctl_dev_info(root, argp); 3040f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 3041f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 3042f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 3043c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 3044c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 30457a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 3046f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 3047f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 3048f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 3049f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 3050ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 3051ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 3052ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 3053ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 3054d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 3055d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 3056d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 3057d7728c96SJan Schmidt return btrfs_ioctl_logical_to_ino(root, argp); 30581406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 30591406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 3060f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 3061f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 3062f46b5a66SChristoph Hellwig return 0; 306346204592SSage Weil case BTRFS_IOC_START_SYNC: 306446204592SSage Weil return btrfs_ioctl_start_sync(file, argp); 306546204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 306646204592SSage Weil return btrfs_ioctl_wait_sync(file, argp); 3067475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 3068475f6387SJan Schmidt return btrfs_ioctl_scrub(root, argp); 3069475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 3070475f6387SJan Schmidt return btrfs_ioctl_scrub_cancel(root, argp); 3071475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 3072475f6387SJan Schmidt return btrfs_ioctl_scrub_progress(root, argp); 3073f46b5a66SChristoph Hellwig } 3074f46b5a66SChristoph Hellwig 3075f46b5a66SChristoph Hellwig return -ENOTTY; 3076f46b5a66SChristoph Hellwig } 3077