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> 434b4e25f2SChris Mason #include "compat.h" 44f46b5a66SChristoph Hellwig #include "ctree.h" 45f46b5a66SChristoph Hellwig #include "disk-io.h" 46f46b5a66SChristoph Hellwig #include "transaction.h" 47f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 48f46b5a66SChristoph Hellwig #include "ioctl.h" 49f46b5a66SChristoph Hellwig #include "print-tree.h" 50f46b5a66SChristoph Hellwig #include "volumes.h" 51925baeddSChris Mason #include "locking.h" 52f46b5a66SChristoph Hellwig 536cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 546cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 556cbff00fSChristoph Hellwig { 566cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 576cbff00fSChristoph Hellwig return flags; 586cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 596cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 606cbff00fSChristoph Hellwig else 616cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 626cbff00fSChristoph Hellwig } 63f46b5a66SChristoph Hellwig 646cbff00fSChristoph Hellwig /* 656cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 666cbff00fSChristoph Hellwig */ 676cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 686cbff00fSChristoph Hellwig { 696cbff00fSChristoph Hellwig unsigned int iflags = 0; 706cbff00fSChristoph Hellwig 716cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 726cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 736cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 746cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 756cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 766cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 776cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 786cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 796cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 806cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 816cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 826cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 836cbff00fSChristoph Hellwig 846cbff00fSChristoph Hellwig return iflags; 856cbff00fSChristoph Hellwig } 866cbff00fSChristoph Hellwig 876cbff00fSChristoph Hellwig /* 886cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 896cbff00fSChristoph Hellwig */ 906cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 916cbff00fSChristoph Hellwig { 926cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 936cbff00fSChristoph Hellwig 946cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 956cbff00fSChristoph Hellwig 966cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 976cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 986cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 996cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1006cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1016cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1026cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1036cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1046cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1056cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1066cbff00fSChristoph Hellwig } 1076cbff00fSChristoph Hellwig 1086cbff00fSChristoph Hellwig /* 1096cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1106cbff00fSChristoph Hellwig * 1116cbff00fSChristoph Hellwig * Unlike extN we don't have any flags we don't want to inherit currently. 1126cbff00fSChristoph Hellwig */ 1136cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1146cbff00fSChristoph Hellwig { 1150b4dcea5SChris Mason unsigned int flags; 1160b4dcea5SChris Mason 1170b4dcea5SChris Mason if (!dir) 1180b4dcea5SChris Mason return; 1190b4dcea5SChris Mason 1200b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1216cbff00fSChristoph Hellwig 1226cbff00fSChristoph Hellwig if (S_ISREG(inode->i_mode)) 1236cbff00fSChristoph Hellwig flags &= ~BTRFS_INODE_DIRSYNC; 1246cbff00fSChristoph Hellwig else if (!S_ISDIR(inode->i_mode)) 1256cbff00fSChristoph Hellwig flags &= (BTRFS_INODE_NODUMP | BTRFS_INODE_NOATIME); 1266cbff00fSChristoph Hellwig 1276cbff00fSChristoph Hellwig BTRFS_I(inode)->flags = flags; 1286cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1296cbff00fSChristoph Hellwig } 1306cbff00fSChristoph Hellwig 1316cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1326cbff00fSChristoph Hellwig { 1336cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); 1346cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1356cbff00fSChristoph Hellwig 1366cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1376cbff00fSChristoph Hellwig return -EFAULT; 1386cbff00fSChristoph Hellwig return 0; 1396cbff00fSChristoph Hellwig } 1406cbff00fSChristoph Hellwig 1416cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1426cbff00fSChristoph Hellwig { 1436cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 1446cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1456cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1466cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1476cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1486cbff00fSChristoph Hellwig int ret; 1496cbff00fSChristoph Hellwig 1506cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1516cbff00fSChristoph Hellwig return -EFAULT; 1526cbff00fSChristoph Hellwig 1536cbff00fSChristoph Hellwig if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 1546cbff00fSChristoph Hellwig FS_NOATIME_FL | FS_NODUMP_FL | \ 1556cbff00fSChristoph Hellwig FS_SYNC_FL | FS_DIRSYNC_FL)) 1566cbff00fSChristoph Hellwig return -EOPNOTSUPP; 1576cbff00fSChristoph Hellwig 1586cbff00fSChristoph Hellwig if (!is_owner_or_cap(inode)) 1596cbff00fSChristoph Hellwig return -EACCES; 1606cbff00fSChristoph Hellwig 1616cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 1626cbff00fSChristoph Hellwig 1636cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 1646cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 1656cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 1666cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 1676cbff00fSChristoph Hellwig ret = -EPERM; 1686cbff00fSChristoph Hellwig goto out_unlock; 1696cbff00fSChristoph Hellwig } 1706cbff00fSChristoph Hellwig } 1716cbff00fSChristoph Hellwig 1726cbff00fSChristoph Hellwig ret = mnt_want_write(file->f_path.mnt); 1736cbff00fSChristoph Hellwig if (ret) 1746cbff00fSChristoph Hellwig goto out_unlock; 1756cbff00fSChristoph Hellwig 1766cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 1776cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 1786cbff00fSChristoph Hellwig else 1796cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 1806cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 1816cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 1826cbff00fSChristoph Hellwig else 1836cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 1846cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 1856cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 1866cbff00fSChristoph Hellwig else 1876cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 1886cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 1896cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 1906cbff00fSChristoph Hellwig else 1916cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 1926cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 1936cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 1946cbff00fSChristoph Hellwig else 1956cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 1966cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 1976cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 1986cbff00fSChristoph Hellwig else 1996cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2006cbff00fSChristoph Hellwig 2016cbff00fSChristoph Hellwig 2026cbff00fSChristoph Hellwig trans = btrfs_join_transaction(root, 1); 2036cbff00fSChristoph Hellwig BUG_ON(!trans); 2046cbff00fSChristoph Hellwig 2056cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 2066cbff00fSChristoph Hellwig BUG_ON(ret); 2076cbff00fSChristoph Hellwig 2086cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 2096cbff00fSChristoph Hellwig inode->i_ctime = CURRENT_TIME; 2106cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 2116cbff00fSChristoph Hellwig 2126cbff00fSChristoph Hellwig mnt_drop_write(file->f_path.mnt); 2136cbff00fSChristoph Hellwig out_unlock: 2146cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 2156cbff00fSChristoph Hellwig return 0; 2166cbff00fSChristoph Hellwig } 2176cbff00fSChristoph Hellwig 2186cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 2196cbff00fSChristoph Hellwig { 2206cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 2216cbff00fSChristoph Hellwig 2226cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 2236cbff00fSChristoph Hellwig } 224f46b5a66SChristoph Hellwig 225cb8e7090SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, 226cb8e7090SChristoph Hellwig struct dentry *dentry, 22772fd032eSSage Weil char *name, int namelen, 22872fd032eSSage Weil u64 *async_transid) 229f46b5a66SChristoph Hellwig { 230f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 231f46b5a66SChristoph Hellwig struct btrfs_key key; 232f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 233f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 234f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 23576dda93cSYan, Zheng struct btrfs_root *new_root; 23676dda93cSYan, Zheng struct inode *dir = dentry->d_parent->d_inode; 237f46b5a66SChristoph Hellwig int ret; 238f46b5a66SChristoph Hellwig int err; 239f46b5a66SChristoph Hellwig u64 objectid; 240f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 2413de4586cSChris Mason u64 index = 0; 242f46b5a66SChristoph Hellwig 243a22285a6SYan, Zheng ret = btrfs_find_free_objectid(NULL, root->fs_info->tree_root, 244a22285a6SYan, Zheng 0, &objectid); 245a22285a6SYan, Zheng if (ret) 246a22285a6SYan, Zheng return ret; 2479ed74f2dSJosef Bacik /* 2489ed74f2dSJosef Bacik * 1 - inode item 2499ed74f2dSJosef Bacik * 2 - refs 2509ed74f2dSJosef Bacik * 1 - root item 2519ed74f2dSJosef Bacik * 2 - dir items 2529ed74f2dSJosef Bacik */ 253a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 6); 254a22285a6SYan, Zheng if (IS_ERR(trans)) 255a22285a6SYan, Zheng return PTR_ERR(trans); 256f46b5a66SChristoph Hellwig 2575d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 2585d4f98a2SYan Zheng 0, objectid, NULL, 0, 0, 0); 2598e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 2608e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 2618e8a1e31SJosef Bacik goto fail; 2628e8a1e31SJosef Bacik } 263f46b5a66SChristoph Hellwig 2645d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 265f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 266f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 2675d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 268f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 269f46b5a66SChristoph Hellwig 270f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 271f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 272f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 2735d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 2745d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 2755d4f98a2SYan Zheng BTRFS_UUID_SIZE); 276f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 277f46b5a66SChristoph Hellwig 278f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 279f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 280f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 281f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 282f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 283a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 284f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 285f46b5a66SChristoph Hellwig 286f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 28784234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 288f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 289f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 29086b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 29180ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 292f46b5a66SChristoph Hellwig 293f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 294f46b5a66SChristoph Hellwig root_item.drop_level = 0; 295f46b5a66SChristoph Hellwig 296925baeddSChris Mason btrfs_tree_unlock(leaf); 297f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 298f46b5a66SChristoph Hellwig leaf = NULL; 299f46b5a66SChristoph Hellwig 300f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 301f46b5a66SChristoph Hellwig 302f46b5a66SChristoph Hellwig key.objectid = objectid; 3035d4f98a2SYan Zheng key.offset = 0; 304f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 305f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 306f46b5a66SChristoph Hellwig &root_item); 307f46b5a66SChristoph Hellwig if (ret) 308f46b5a66SChristoph Hellwig goto fail; 309f46b5a66SChristoph Hellwig 31076dda93cSYan, Zheng key.offset = (u64)-1; 31176dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 31276dda93cSYan, Zheng BUG_ON(IS_ERR(new_root)); 31376dda93cSYan, Zheng 31476dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 31576dda93cSYan, Zheng 31676dda93cSYan, Zheng ret = btrfs_create_subvol_root(trans, new_root, new_dirid, 31776dda93cSYan, Zheng BTRFS_I(dir)->block_group); 318f46b5a66SChristoph Hellwig /* 319f46b5a66SChristoph Hellwig * insert the directory item 320f46b5a66SChristoph Hellwig */ 3213de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 3223de4586cSChris Mason BUG_ON(ret); 3233de4586cSChris Mason 3243de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 325f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 3263de4586cSChris Mason BTRFS_FT_DIR, index); 327f46b5a66SChristoph Hellwig if (ret) 328f46b5a66SChristoph Hellwig goto fail; 3290660b5afSChris Mason 33052c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 33152c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 33252c26179SYan Zheng BUG_ON(ret); 33352c26179SYan Zheng 3340660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 3354df27c4dSYan, Zheng objectid, root->root_key.objectid, 3360660b5afSChris Mason dir->i_ino, index, name, namelen); 33776dda93cSYan, Zheng 3380660b5afSChris Mason BUG_ON(ret); 3390660b5afSChris Mason 34076dda93cSYan, Zheng d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 341f46b5a66SChristoph Hellwig fail: 34272fd032eSSage Weil if (async_transid) { 34372fd032eSSage Weil *async_transid = trans->transid; 34472fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 34572fd032eSSage Weil } else { 34676dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 34772fd032eSSage Weil } 348f46b5a66SChristoph Hellwig if (err && !ret) 349f46b5a66SChristoph Hellwig ret = err; 350f46b5a66SChristoph Hellwig return ret; 351f46b5a66SChristoph Hellwig } 352f46b5a66SChristoph Hellwig 35372fd032eSSage Weil static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 35472fd032eSSage Weil char *name, int namelen, u64 *async_transid) 355f46b5a66SChristoph Hellwig { 3562e4bfab9SYan, Zheng struct inode *inode; 357f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 358f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 3592e4bfab9SYan, Zheng int ret; 360f46b5a66SChristoph Hellwig 361f46b5a66SChristoph Hellwig if (!root->ref_cows) 362f46b5a66SChristoph Hellwig return -EINVAL; 363f46b5a66SChristoph Hellwig 364a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 365a22285a6SYan, Zheng if (!pending_snapshot) 366a22285a6SYan, Zheng return -ENOMEM; 367a22285a6SYan, Zheng 368a22285a6SYan, Zheng btrfs_init_block_rsv(&pending_snapshot->block_rsv); 369a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 370a22285a6SYan, Zheng pending_snapshot->root = root; 371a22285a6SYan, Zheng 372a22285a6SYan, Zheng trans = btrfs_start_transaction(root->fs_info->extent_root, 5); 373a22285a6SYan, Zheng if (IS_ERR(trans)) { 374a22285a6SYan, Zheng ret = PTR_ERR(trans); 375a22285a6SYan, Zheng goto fail; 376a22285a6SYan, Zheng } 377a22285a6SYan, Zheng 378a22285a6SYan, Zheng ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); 379a22285a6SYan, Zheng BUG_ON(ret); 380a22285a6SYan, Zheng 381a22285a6SYan, Zheng list_add(&pending_snapshot->list, 382a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 38372fd032eSSage Weil if (async_transid) { 38472fd032eSSage Weil *async_transid = trans->transid; 38572fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 38672fd032eSSage Weil root->fs_info->extent_root, 1); 38772fd032eSSage Weil } else { 38872fd032eSSage Weil ret = btrfs_commit_transaction(trans, 38972fd032eSSage Weil root->fs_info->extent_root); 39072fd032eSSage Weil } 391a22285a6SYan, Zheng BUG_ON(ret); 392a22285a6SYan, Zheng 393a22285a6SYan, Zheng ret = pending_snapshot->error; 394f46b5a66SChristoph Hellwig if (ret) 3952e4bfab9SYan, Zheng goto fail; 396f46b5a66SChristoph Hellwig 397a22285a6SYan, Zheng btrfs_orphan_cleanup(pending_snapshot->snap); 398f46b5a66SChristoph Hellwig 3992e4bfab9SYan, Zheng inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); 4002e4bfab9SYan, Zheng if (IS_ERR(inode)) { 4012e4bfab9SYan, Zheng ret = PTR_ERR(inode); 4022e4bfab9SYan, Zheng goto fail; 4032e4bfab9SYan, Zheng } 4042e4bfab9SYan, Zheng BUG_ON(!inode); 4052e4bfab9SYan, Zheng d_instantiate(dentry, inode); 4062e4bfab9SYan, Zheng ret = 0; 4072e4bfab9SYan, Zheng fail: 408a22285a6SYan, Zheng kfree(pending_snapshot); 409f46b5a66SChristoph Hellwig return ret; 410f46b5a66SChristoph Hellwig } 411f46b5a66SChristoph Hellwig 412*4260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 413*4260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 414*4260f7c7SSage Weil * minimal. 415*4260f7c7SSage Weil */ 416*4260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 417*4260f7c7SSage Weil { 418*4260f7c7SSage Weil uid_t fsuid = current_fsuid(); 419*4260f7c7SSage Weil 420*4260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 421*4260f7c7SSage Weil return 0; 422*4260f7c7SSage Weil if (inode->i_uid == fsuid) 423*4260f7c7SSage Weil return 0; 424*4260f7c7SSage Weil if (dir->i_uid == fsuid) 425*4260f7c7SSage Weil return 0; 426*4260f7c7SSage Weil return !capable(CAP_FOWNER); 427*4260f7c7SSage Weil } 428*4260f7c7SSage Weil 429*4260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 430*4260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 431*4260f7c7SSage Weil * whether the type of victim is right. 432*4260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 433*4260f7c7SSage Weil * 2. We should have write and exec permissions on dir 434*4260f7c7SSage Weil * 3. We can't remove anything from append-only dir 435*4260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 436*4260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 437*4260f7c7SSage Weil * a. be owner of dir, or 438*4260f7c7SSage Weil * b. be owner of victim, or 439*4260f7c7SSage Weil * c. have CAP_FOWNER capability 440*4260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 441*4260f7c7SSage Weil * links pointing to it. 442*4260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 443*4260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 444*4260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 445*4260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 446*4260f7c7SSage Weil * nfs_async_unlink(). 447*4260f7c7SSage Weil */ 448*4260f7c7SSage Weil 449*4260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) 450*4260f7c7SSage Weil { 451*4260f7c7SSage Weil int error; 452*4260f7c7SSage Weil 453*4260f7c7SSage Weil if (!victim->d_inode) 454*4260f7c7SSage Weil return -ENOENT; 455*4260f7c7SSage Weil 456*4260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 457*4260f7c7SSage Weil audit_inode_child(victim, dir); 458*4260f7c7SSage Weil 459*4260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 460*4260f7c7SSage Weil if (error) 461*4260f7c7SSage Weil return error; 462*4260f7c7SSage Weil if (IS_APPEND(dir)) 463*4260f7c7SSage Weil return -EPERM; 464*4260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 465*4260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 466*4260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 467*4260f7c7SSage Weil return -EPERM; 468*4260f7c7SSage Weil if (isdir) { 469*4260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 470*4260f7c7SSage Weil return -ENOTDIR; 471*4260f7c7SSage Weil if (IS_ROOT(victim)) 472*4260f7c7SSage Weil return -EBUSY; 473*4260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 474*4260f7c7SSage Weil return -EISDIR; 475*4260f7c7SSage Weil if (IS_DEADDIR(dir)) 476*4260f7c7SSage Weil return -ENOENT; 477*4260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 478*4260f7c7SSage Weil return -EBUSY; 479*4260f7c7SSage Weil return 0; 480*4260f7c7SSage Weil } 481*4260f7c7SSage Weil 482cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 483cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 484cb8e7090SChristoph Hellwig { 485cb8e7090SChristoph Hellwig if (child->d_inode) 486cb8e7090SChristoph Hellwig return -EEXIST; 487cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 488cb8e7090SChristoph Hellwig return -ENOENT; 489cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 490cb8e7090SChristoph Hellwig } 491cb8e7090SChristoph Hellwig 492cb8e7090SChristoph Hellwig /* 493cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 494cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 495cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 496cb8e7090SChristoph Hellwig */ 49776dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 49876dda93cSYan, Zheng char *name, int namelen, 49972fd032eSSage Weil struct btrfs_root *snap_src, 50072fd032eSSage Weil u64 *async_transid) 501cb8e7090SChristoph Hellwig { 50276dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 503cb8e7090SChristoph Hellwig struct dentry *dentry; 504cb8e7090SChristoph Hellwig int error; 505cb8e7090SChristoph Hellwig 50676dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 507cb8e7090SChristoph Hellwig 508cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 509cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 510cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 511cb8e7090SChristoph Hellwig goto out_unlock; 512cb8e7090SChristoph Hellwig 513cb8e7090SChristoph Hellwig error = -EEXIST; 514cb8e7090SChristoph Hellwig if (dentry->d_inode) 515cb8e7090SChristoph Hellwig goto out_dput; 516cb8e7090SChristoph Hellwig 517cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 518cb8e7090SChristoph Hellwig if (error) 519cb8e7090SChristoph Hellwig goto out_dput; 520cb8e7090SChristoph Hellwig 52176dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 522cb8e7090SChristoph Hellwig if (error) 523cb8e7090SChristoph Hellwig goto out_drop_write; 524cb8e7090SChristoph Hellwig 52576dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 52676dda93cSYan, Zheng 52776dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 52876dda93cSYan, Zheng goto out_up_read; 52976dda93cSYan, Zheng 5303de4586cSChris Mason if (snap_src) { 53172fd032eSSage Weil error = create_snapshot(snap_src, dentry, 53272fd032eSSage Weil name, namelen, async_transid); 5333de4586cSChris Mason } else { 53476dda93cSYan, Zheng error = create_subvol(BTRFS_I(dir)->root, dentry, 53572fd032eSSage Weil name, namelen, async_transid); 5363de4586cSChris Mason } 53776dda93cSYan, Zheng if (!error) 53876dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 53976dda93cSYan, Zheng out_up_read: 54076dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 541cb8e7090SChristoph Hellwig out_drop_write: 542cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 543cb8e7090SChristoph Hellwig out_dput: 544cb8e7090SChristoph Hellwig dput(dentry); 545cb8e7090SChristoph Hellwig out_unlock: 54676dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 547cb8e7090SChristoph Hellwig return error; 548cb8e7090SChristoph Hellwig } 549cb8e7090SChristoph Hellwig 550940100a4SChris Mason static int should_defrag_range(struct inode *inode, u64 start, u64 len, 5511e701a32SChris Mason int thresh, u64 *last_len, u64 *skip, 5521e701a32SChris Mason u64 *defrag_end) 553940100a4SChris Mason { 554940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 555940100a4SChris Mason struct extent_map *em = NULL; 556940100a4SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 557940100a4SChris Mason int ret = 1; 558940100a4SChris Mason 5591e701a32SChris Mason 5601e701a32SChris Mason if (thresh == 0) 5611e701a32SChris Mason thresh = 256 * 1024; 5621e701a32SChris Mason 563940100a4SChris Mason /* 564940100a4SChris Mason * make sure that once we start defragging and extent, we keep on 565940100a4SChris Mason * defragging it 566940100a4SChris Mason */ 567940100a4SChris Mason if (start < *defrag_end) 568940100a4SChris Mason return 1; 569940100a4SChris Mason 570940100a4SChris Mason *skip = 0; 571940100a4SChris Mason 572940100a4SChris Mason /* 573940100a4SChris Mason * hopefully we have this extent in the tree already, try without 574940100a4SChris Mason * the full extent lock 575940100a4SChris Mason */ 576940100a4SChris Mason read_lock(&em_tree->lock); 577940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 578940100a4SChris Mason read_unlock(&em_tree->lock); 579940100a4SChris Mason 580940100a4SChris Mason if (!em) { 581940100a4SChris Mason /* get the big lock and read metadata off disk */ 582940100a4SChris Mason lock_extent(io_tree, start, start + len - 1, GFP_NOFS); 583940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 584940100a4SChris Mason unlock_extent(io_tree, start, start + len - 1, GFP_NOFS); 585940100a4SChris Mason 5866cf8bfbfSDan Carpenter if (IS_ERR(em)) 587940100a4SChris Mason return 0; 588940100a4SChris Mason } 589940100a4SChris Mason 590940100a4SChris Mason /* this will cover holes, and inline extents */ 591940100a4SChris Mason if (em->block_start >= EXTENT_MAP_LAST_BYTE) 592940100a4SChris Mason ret = 0; 593940100a4SChris Mason 594940100a4SChris Mason /* 595940100a4SChris Mason * we hit a real extent, if it is big don't bother defragging it again 596940100a4SChris Mason */ 5971e701a32SChris Mason if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh) 598940100a4SChris Mason ret = 0; 599940100a4SChris Mason 600940100a4SChris Mason /* 601940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 602940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 603940100a4SChris Mason * so that the next tiny extent will force a defrag. 604940100a4SChris Mason * 605940100a4SChris Mason * The end result of this is that tiny extents before a single big 606940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 607940100a4SChris Mason */ 608940100a4SChris Mason if (ret) { 609940100a4SChris Mason *last_len += len; 610940100a4SChris Mason *defrag_end = extent_map_end(em); 611940100a4SChris Mason } else { 612940100a4SChris Mason *last_len = 0; 613940100a4SChris Mason *skip = extent_map_end(em); 614940100a4SChris Mason *defrag_end = 0; 615940100a4SChris Mason } 616940100a4SChris Mason 617940100a4SChris Mason free_extent_map(em); 618940100a4SChris Mason return ret; 619940100a4SChris Mason } 620940100a4SChris Mason 6211e701a32SChris Mason static int btrfs_defrag_file(struct file *file, 6221e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range) 623f46b5a66SChristoph Hellwig { 624f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 625f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 626f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 6273eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 628f46b5a66SChristoph Hellwig struct page *page; 629f46b5a66SChristoph Hellwig unsigned long last_index; 630f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 631f46b5a66SChristoph Hellwig unsigned long total_read = 0; 632f46b5a66SChristoph Hellwig u64 page_start; 633f46b5a66SChristoph Hellwig u64 page_end; 634940100a4SChris Mason u64 last_len = 0; 635940100a4SChris Mason u64 skip = 0; 636940100a4SChris Mason u64 defrag_end = 0; 637f46b5a66SChristoph Hellwig unsigned long i; 638f46b5a66SChristoph Hellwig int ret; 639f46b5a66SChristoph Hellwig 640940100a4SChris Mason if (inode->i_size == 0) 641940100a4SChris Mason return 0; 642f46b5a66SChristoph Hellwig 6431e701a32SChris Mason if (range->start + range->len > range->start) { 6441e701a32SChris Mason last_index = min_t(u64, inode->i_size - 1, 6451e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 6461e701a32SChris Mason } else { 647940100a4SChris Mason last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; 6481e701a32SChris Mason } 6491e701a32SChris Mason 6501e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 651940100a4SChris Mason while (i <= last_index) { 652940100a4SChris Mason if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 6531e701a32SChris Mason PAGE_CACHE_SIZE, 6541e701a32SChris Mason range->extent_thresh, 6551e701a32SChris Mason &last_len, &skip, 656940100a4SChris Mason &defrag_end)) { 657940100a4SChris Mason unsigned long next; 658940100a4SChris Mason /* 659940100a4SChris Mason * the should_defrag function tells us how much to skip 660940100a4SChris Mason * bump our counter by the suggested amount 661940100a4SChris Mason */ 662940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 663940100a4SChris Mason i = max(i + 1, next); 664940100a4SChris Mason continue; 665940100a4SChris Mason } 666940100a4SChris Mason 667f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 668f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 669f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 670f46b5a66SChristoph Hellwig } 671f46b5a66SChristoph Hellwig total_read++; 672940100a4SChris Mason mutex_lock(&inode->i_mutex); 6731e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 6741e701a32SChris Mason BTRFS_I(inode)->force_compress = 1; 675940100a4SChris Mason 6760ca1f7ceSYan, Zheng ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); 6770ca1f7ceSYan, Zheng if (ret) 6780ca1f7ceSYan, Zheng goto err_unlock; 6793eaa2885SChris Mason again: 680940100a4SChris Mason if (inode->i_size == 0 || 681940100a4SChris Mason i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) { 682940100a4SChris Mason ret = 0; 683940100a4SChris Mason goto err_reservations; 684940100a4SChris Mason } 685940100a4SChris Mason 686f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 6870ca1f7ceSYan, Zheng if (!page) { 6880ca1f7ceSYan, Zheng ret = -ENOMEM; 689940100a4SChris Mason goto err_reservations; 6900ca1f7ceSYan, Zheng } 691940100a4SChris Mason 692f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 693f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 694f46b5a66SChristoph Hellwig lock_page(page); 695f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 696f46b5a66SChristoph Hellwig unlock_page(page); 697f46b5a66SChristoph Hellwig page_cache_release(page); 6980ca1f7ceSYan, Zheng ret = -EIO; 699940100a4SChris Mason goto err_reservations; 700f46b5a66SChristoph Hellwig } 701f46b5a66SChristoph Hellwig } 702f46b5a66SChristoph Hellwig 703940100a4SChris Mason if (page->mapping != inode->i_mapping) { 704940100a4SChris Mason unlock_page(page); 705940100a4SChris Mason page_cache_release(page); 706940100a4SChris Mason goto again; 707940100a4SChris Mason } 708940100a4SChris Mason 709f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 710f46b5a66SChristoph Hellwig 711940100a4SChris Mason if (PageDirty(page)) { 7120ca1f7ceSYan, Zheng btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); 713940100a4SChris Mason goto loop_unlock; 714940100a4SChris Mason } 715940100a4SChris Mason 716f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 717f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 718f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 7193eaa2885SChris Mason 7203eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 7213eaa2885SChris Mason if (ordered) { 7223eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 7233eaa2885SChris Mason unlock_page(page); 7243eaa2885SChris Mason page_cache_release(page); 7253eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 7263eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 7273eaa2885SChris Mason goto again; 7283eaa2885SChris Mason } 7293eaa2885SChris Mason set_page_extent_mapped(page); 7303eaa2885SChris Mason 731f87f057bSChris Mason /* 732f87f057bSChris Mason * this makes sure page_mkwrite is called on the 733f87f057bSChris Mason * page if it is dirtied again later 734f87f057bSChris Mason */ 735f87f057bSChris Mason clear_page_dirty_for_io(page); 736940100a4SChris Mason clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, 737940100a4SChris Mason page_end, EXTENT_DIRTY | EXTENT_DELALLOC | 738940100a4SChris Mason EXTENT_DO_ACCOUNTING, GFP_NOFS); 739f87f057bSChris Mason 7402ac55d41SJosef Bacik btrfs_set_extent_delalloc(inode, page_start, page_end, NULL); 741940100a4SChris Mason ClearPageChecked(page); 742f46b5a66SChristoph Hellwig set_page_dirty(page); 743a1ed835eSChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 744940100a4SChris Mason 745940100a4SChris Mason loop_unlock: 746f46b5a66SChristoph Hellwig unlock_page(page); 747f46b5a66SChristoph Hellwig page_cache_release(page); 748940100a4SChris Mason mutex_unlock(&inode->i_mutex); 749940100a4SChris Mason 750f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 751940100a4SChris Mason i++; 752f46b5a66SChristoph Hellwig } 753f46b5a66SChristoph Hellwig 7541e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 7551e701a32SChris Mason filemap_flush(inode->i_mapping); 7561e701a32SChris Mason 7571e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 7581e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 7591e701a32SChris Mason * we have to make sure the IO is actually started and that 7601e701a32SChris Mason * ordered extents get created before we return 7611e701a32SChris Mason */ 7621e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 7631e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 7641e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 7651e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 7661e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 7671e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 7681e701a32SChris Mason } 7691e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 7701e701a32SChris Mason 7711e701a32SChris Mason mutex_lock(&inode->i_mutex); 7721e701a32SChris Mason BTRFS_I(inode)->force_compress = 0; 7731e701a32SChris Mason mutex_unlock(&inode->i_mutex); 7741e701a32SChris Mason } 7751e701a32SChris Mason 776f46b5a66SChristoph Hellwig return 0; 777940100a4SChris Mason 778940100a4SChris Mason err_reservations: 7790ca1f7ceSYan, Zheng btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); 7800ca1f7ceSYan, Zheng err_unlock: 781940100a4SChris Mason mutex_unlock(&inode->i_mutex); 782940100a4SChris Mason return ret; 783f46b5a66SChristoph Hellwig } 784f46b5a66SChristoph Hellwig 78576dda93cSYan, Zheng static noinline int btrfs_ioctl_resize(struct btrfs_root *root, 78676dda93cSYan, Zheng void __user *arg) 787f46b5a66SChristoph Hellwig { 788f46b5a66SChristoph Hellwig u64 new_size; 789f46b5a66SChristoph Hellwig u64 old_size; 790f46b5a66SChristoph Hellwig u64 devid = 1; 791f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 792f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 793f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 794f46b5a66SChristoph Hellwig char *sizestr; 795f46b5a66SChristoph Hellwig char *devstr = NULL; 796f46b5a66SChristoph Hellwig int ret = 0; 797f46b5a66SChristoph Hellwig int mod = 0; 798f46b5a66SChristoph Hellwig 799c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 800c146afadSYan Zheng return -EROFS; 801c146afadSYan Zheng 802e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 803e441d54dSChris Mason return -EPERM; 804e441d54dSChris Mason 805dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 806dae7b665SLi Zefan if (IS_ERR(vol_args)) 807dae7b665SLi Zefan return PTR_ERR(vol_args); 8085516e595SMark Fasheh 8095516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 810f46b5a66SChristoph Hellwig 8117d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 812f46b5a66SChristoph Hellwig sizestr = vol_args->name; 813f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 814f46b5a66SChristoph Hellwig if (devstr) { 815f46b5a66SChristoph Hellwig char *end; 816f46b5a66SChristoph Hellwig sizestr = devstr + 1; 817f46b5a66SChristoph Hellwig *devstr = '\0'; 818f46b5a66SChristoph Hellwig devstr = vol_args->name; 819f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 82021380931SJoel Becker printk(KERN_INFO "resizing devid %llu\n", 82121380931SJoel Becker (unsigned long long)devid); 822f46b5a66SChristoph Hellwig } 8232b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 824f46b5a66SChristoph Hellwig if (!device) { 82521380931SJoel Becker printk(KERN_INFO "resizer unable to find device %llu\n", 82621380931SJoel Becker (unsigned long long)devid); 827f46b5a66SChristoph Hellwig ret = -EINVAL; 828f46b5a66SChristoph Hellwig goto out_unlock; 829f46b5a66SChristoph Hellwig } 830f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 831f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 832f46b5a66SChristoph Hellwig else { 833f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 834f46b5a66SChristoph Hellwig mod = -1; 835f46b5a66SChristoph Hellwig sizestr++; 836f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 837f46b5a66SChristoph Hellwig mod = 1; 838f46b5a66SChristoph Hellwig sizestr++; 839f46b5a66SChristoph Hellwig } 84091748467SAkinobu Mita new_size = memparse(sizestr, NULL); 841f46b5a66SChristoph Hellwig if (new_size == 0) { 842f46b5a66SChristoph Hellwig ret = -EINVAL; 843f46b5a66SChristoph Hellwig goto out_unlock; 844f46b5a66SChristoph Hellwig } 845f46b5a66SChristoph Hellwig } 846f46b5a66SChristoph Hellwig 847f46b5a66SChristoph Hellwig old_size = device->total_bytes; 848f46b5a66SChristoph Hellwig 849f46b5a66SChristoph Hellwig if (mod < 0) { 850f46b5a66SChristoph Hellwig if (new_size > old_size) { 851f46b5a66SChristoph Hellwig ret = -EINVAL; 852f46b5a66SChristoph Hellwig goto out_unlock; 853f46b5a66SChristoph Hellwig } 854f46b5a66SChristoph Hellwig new_size = old_size - new_size; 855f46b5a66SChristoph Hellwig } else if (mod > 0) { 856f46b5a66SChristoph Hellwig new_size = old_size + new_size; 857f46b5a66SChristoph Hellwig } 858f46b5a66SChristoph Hellwig 859f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 860f46b5a66SChristoph Hellwig ret = -EINVAL; 861f46b5a66SChristoph Hellwig goto out_unlock; 862f46b5a66SChristoph Hellwig } 863f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 864f46b5a66SChristoph Hellwig ret = -EFBIG; 865f46b5a66SChristoph Hellwig goto out_unlock; 866f46b5a66SChristoph Hellwig } 867f46b5a66SChristoph Hellwig 868f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 869f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 870f46b5a66SChristoph Hellwig 871f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 872f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 873f46b5a66SChristoph Hellwig 874f46b5a66SChristoph Hellwig if (new_size > old_size) { 875a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 876f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 877f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 878f46b5a66SChristoph Hellwig } else { 879f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 880f46b5a66SChristoph Hellwig } 881f46b5a66SChristoph Hellwig 882f46b5a66SChristoph Hellwig out_unlock: 8837d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 884f46b5a66SChristoph Hellwig kfree(vol_args); 885f46b5a66SChristoph Hellwig return ret; 886f46b5a66SChristoph Hellwig } 887f46b5a66SChristoph Hellwig 88872fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 88972fd032eSSage Weil char *name, 89072fd032eSSage Weil unsigned long fd, 89172fd032eSSage Weil int subvol, 89272fd032eSSage Weil u64 *transid) 893f46b5a66SChristoph Hellwig { 894cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 8953de4586cSChris Mason struct file *src_file; 896f46b5a66SChristoph Hellwig int namelen; 8973de4586cSChris Mason int ret = 0; 898f46b5a66SChristoph Hellwig 899c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 900c146afadSYan Zheng return -EROFS; 901c146afadSYan Zheng 90272fd032eSSage Weil namelen = strlen(name); 90372fd032eSSage Weil if (strchr(name, '/')) { 904f46b5a66SChristoph Hellwig ret = -EINVAL; 905f46b5a66SChristoph Hellwig goto out; 906f46b5a66SChristoph Hellwig } 907f46b5a66SChristoph Hellwig 9083de4586cSChris Mason if (subvol) { 90972fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 91072fd032eSSage Weil NULL, transid); 911cb8e7090SChristoph Hellwig } else { 9123de4586cSChris Mason struct inode *src_inode; 91372fd032eSSage Weil src_file = fget(fd); 9143de4586cSChris Mason if (!src_file) { 9153de4586cSChris Mason ret = -EINVAL; 9163de4586cSChris Mason goto out; 9173de4586cSChris Mason } 9183de4586cSChris Mason 9193de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 9203de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 921d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 922d397712bSChris Mason "another FS\n"); 9233de4586cSChris Mason ret = -EINVAL; 9243de4586cSChris Mason fput(src_file); 9253de4586cSChris Mason goto out; 9263de4586cSChris Mason } 92772fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 92872fd032eSSage Weil BTRFS_I(src_inode)->root, 92972fd032eSSage Weil transid); 9303de4586cSChris Mason fput(src_file); 931cb8e7090SChristoph Hellwig } 932f46b5a66SChristoph Hellwig out: 93372fd032eSSage Weil return ret; 93472fd032eSSage Weil } 93572fd032eSSage Weil 93672fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 93772fd032eSSage Weil void __user *arg, int subvol, 93872fd032eSSage Weil int async) 93972fd032eSSage Weil { 94072fd032eSSage Weil struct btrfs_ioctl_vol_args *vol_args = NULL; 94172fd032eSSage Weil struct btrfs_ioctl_async_vol_args *async_vol_args = NULL; 94272fd032eSSage Weil char *name; 94372fd032eSSage Weil u64 fd; 94472fd032eSSage Weil u64 transid = 0; 94572fd032eSSage Weil int ret; 94672fd032eSSage Weil 94772fd032eSSage Weil if (async) { 94872fd032eSSage Weil async_vol_args = memdup_user(arg, sizeof(*async_vol_args)); 94972fd032eSSage Weil if (IS_ERR(async_vol_args)) 95072fd032eSSage Weil return PTR_ERR(async_vol_args); 95172fd032eSSage Weil 95272fd032eSSage Weil name = async_vol_args->name; 95372fd032eSSage Weil fd = async_vol_args->fd; 95472fd032eSSage Weil async_vol_args->name[BTRFS_SNAPSHOT_NAME_MAX] = '\0'; 95572fd032eSSage Weil } else { 95672fd032eSSage Weil vol_args = memdup_user(arg, sizeof(*vol_args)); 95772fd032eSSage Weil if (IS_ERR(vol_args)) 95872fd032eSSage Weil return PTR_ERR(vol_args); 95972fd032eSSage Weil name = vol_args->name; 96072fd032eSSage Weil fd = vol_args->fd; 96172fd032eSSage Weil vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 96272fd032eSSage Weil } 96372fd032eSSage Weil 96472fd032eSSage Weil ret = btrfs_ioctl_snap_create_transid(file, name, fd, 96572fd032eSSage Weil subvol, &transid); 96672fd032eSSage Weil 96772fd032eSSage Weil if (!ret && async) { 96872fd032eSSage Weil if (copy_to_user(arg + 96972fd032eSSage Weil offsetof(struct btrfs_ioctl_async_vol_args, 97072fd032eSSage Weil transid), &transid, sizeof(transid))) 97172fd032eSSage Weil return -EFAULT; 97272fd032eSSage Weil } 97372fd032eSSage Weil 974f46b5a66SChristoph Hellwig kfree(vol_args); 97572fd032eSSage Weil kfree(async_vol_args); 97672fd032eSSage Weil 977f46b5a66SChristoph Hellwig return ret; 978f46b5a66SChristoph Hellwig } 979f46b5a66SChristoph Hellwig 98076dda93cSYan, Zheng /* 98176dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 98276dda93cSYan, Zheng */ 98376dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 98476dda93cSYan, Zheng { 98576dda93cSYan, Zheng struct btrfs_path *path; 98676dda93cSYan, Zheng struct btrfs_key key; 98776dda93cSYan, Zheng int ret; 98876dda93cSYan, Zheng 98976dda93cSYan, Zheng path = btrfs_alloc_path(); 99076dda93cSYan, Zheng if (!path) 99176dda93cSYan, Zheng return -ENOMEM; 99276dda93cSYan, Zheng 99376dda93cSYan, Zheng key.objectid = root->root_key.objectid; 99476dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 99576dda93cSYan, Zheng key.offset = (u64)-1; 99676dda93cSYan, Zheng 99776dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 99876dda93cSYan, Zheng &key, path, 0, 0); 99976dda93cSYan, Zheng if (ret < 0) 100076dda93cSYan, Zheng goto out; 100176dda93cSYan, Zheng BUG_ON(ret == 0); 100276dda93cSYan, Zheng 100376dda93cSYan, Zheng ret = 0; 100476dda93cSYan, Zheng if (path->slots[0] > 0) { 100576dda93cSYan, Zheng path->slots[0]--; 100676dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 100776dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 100876dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 100976dda93cSYan, Zheng ret = -ENOTEMPTY; 101076dda93cSYan, Zheng } 101176dda93cSYan, Zheng out: 101276dda93cSYan, Zheng btrfs_free_path(path); 101376dda93cSYan, Zheng return ret; 101476dda93cSYan, Zheng } 101576dda93cSYan, Zheng 1016ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1017ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1018ac8e9819SChris Mason { 1019abc6e134SChris Mason struct btrfs_key test; 1020abc6e134SChris Mason int ret; 1021abc6e134SChris Mason 1022abc6e134SChris Mason test.objectid = sk->min_objectid; 1023abc6e134SChris Mason test.type = sk->min_type; 1024abc6e134SChris Mason test.offset = sk->min_offset; 1025abc6e134SChris Mason 1026abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1027abc6e134SChris Mason if (ret < 0) 1028ac8e9819SChris Mason return 0; 1029abc6e134SChris Mason 1030abc6e134SChris Mason test.objectid = sk->max_objectid; 1031abc6e134SChris Mason test.type = sk->max_type; 1032abc6e134SChris Mason test.offset = sk->max_offset; 1033abc6e134SChris Mason 1034abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1035abc6e134SChris Mason if (ret > 0) 1036ac8e9819SChris Mason return 0; 1037ac8e9819SChris Mason return 1; 1038ac8e9819SChris Mason } 1039ac8e9819SChris Mason 1040ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1041ac8e9819SChris Mason struct btrfs_path *path, 1042ac8e9819SChris Mason struct btrfs_key *key, 1043ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1044ac8e9819SChris Mason char *buf, 1045ac8e9819SChris Mason unsigned long *sk_offset, 1046ac8e9819SChris Mason int *num_found) 1047ac8e9819SChris Mason { 1048ac8e9819SChris Mason u64 found_transid; 1049ac8e9819SChris Mason struct extent_buffer *leaf; 1050ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1051ac8e9819SChris Mason unsigned long item_off; 1052ac8e9819SChris Mason unsigned long item_len; 1053ac8e9819SChris Mason int nritems; 1054ac8e9819SChris Mason int i; 1055ac8e9819SChris Mason int slot; 1056ac8e9819SChris Mason int found = 0; 1057ac8e9819SChris Mason int ret = 0; 1058ac8e9819SChris Mason 1059ac8e9819SChris Mason leaf = path->nodes[0]; 1060ac8e9819SChris Mason slot = path->slots[0]; 1061ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1062ac8e9819SChris Mason 1063ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1064ac8e9819SChris Mason i = nritems; 1065ac8e9819SChris Mason goto advance_key; 1066ac8e9819SChris Mason } 1067ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1068ac8e9819SChris Mason 1069ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1070ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1071ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1072ac8e9819SChris Mason 1073ac8e9819SChris Mason if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1074ac8e9819SChris Mason item_len = 0; 1075ac8e9819SChris Mason 1076ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1077ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1078ac8e9819SChris Mason ret = 1; 1079ac8e9819SChris Mason goto overflow; 1080ac8e9819SChris Mason } 1081ac8e9819SChris Mason 1082ac8e9819SChris Mason btrfs_item_key_to_cpu(leaf, key, i); 1083ac8e9819SChris Mason if (!key_in_sk(key, sk)) 1084ac8e9819SChris Mason continue; 1085ac8e9819SChris Mason 1086ac8e9819SChris Mason sh.objectid = key->objectid; 1087ac8e9819SChris Mason sh.offset = key->offset; 1088ac8e9819SChris Mason sh.type = key->type; 1089ac8e9819SChris Mason sh.len = item_len; 1090ac8e9819SChris Mason sh.transid = found_transid; 1091ac8e9819SChris Mason 1092ac8e9819SChris Mason /* copy search result header */ 1093ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1094ac8e9819SChris Mason *sk_offset += sizeof(sh); 1095ac8e9819SChris Mason 1096ac8e9819SChris Mason if (item_len) { 1097ac8e9819SChris Mason char *p = buf + *sk_offset; 1098ac8e9819SChris Mason /* copy the item */ 1099ac8e9819SChris Mason read_extent_buffer(leaf, p, 1100ac8e9819SChris Mason item_off, item_len); 1101ac8e9819SChris Mason *sk_offset += item_len; 1102ac8e9819SChris Mason } 110390fdde14SChris Mason found++; 1104ac8e9819SChris Mason 1105ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1106ac8e9819SChris Mason break; 1107ac8e9819SChris Mason } 1108ac8e9819SChris Mason advance_key: 1109ac8e9819SChris Mason ret = 0; 1110abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1111abc6e134SChris Mason key->offset++; 1112abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1113abc6e134SChris Mason key->offset = 0; 1114abc6e134SChris Mason key->type++; 1115abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1116abc6e134SChris Mason key->offset = 0; 1117abc6e134SChris Mason key->type = 0; 1118abc6e134SChris Mason key->objectid++; 1119abc6e134SChris Mason } else 1120abc6e134SChris Mason ret = 1; 1121ac8e9819SChris Mason overflow: 1122ac8e9819SChris Mason *num_found += found; 1123ac8e9819SChris Mason return ret; 1124ac8e9819SChris Mason } 1125ac8e9819SChris Mason 1126ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1127ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1128ac8e9819SChris Mason { 1129ac8e9819SChris Mason struct btrfs_root *root; 1130ac8e9819SChris Mason struct btrfs_key key; 1131ac8e9819SChris Mason struct btrfs_key max_key; 1132ac8e9819SChris Mason struct btrfs_path *path; 1133ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1134ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1135ac8e9819SChris Mason int ret; 1136ac8e9819SChris Mason int num_found = 0; 1137ac8e9819SChris Mason unsigned long sk_offset = 0; 1138ac8e9819SChris Mason 1139ac8e9819SChris Mason path = btrfs_alloc_path(); 1140ac8e9819SChris Mason if (!path) 1141ac8e9819SChris Mason return -ENOMEM; 1142ac8e9819SChris Mason 1143ac8e9819SChris Mason if (sk->tree_id == 0) { 1144ac8e9819SChris Mason /* search the root of the inode that was passed */ 1145ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1146ac8e9819SChris Mason } else { 1147ac8e9819SChris Mason key.objectid = sk->tree_id; 1148ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1149ac8e9819SChris Mason key.offset = (u64)-1; 1150ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1151ac8e9819SChris Mason if (IS_ERR(root)) { 1152ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1153ac8e9819SChris Mason sk->tree_id); 1154ac8e9819SChris Mason btrfs_free_path(path); 1155ac8e9819SChris Mason return -ENOENT; 1156ac8e9819SChris Mason } 1157ac8e9819SChris Mason } 1158ac8e9819SChris Mason 1159ac8e9819SChris Mason key.objectid = sk->min_objectid; 1160ac8e9819SChris Mason key.type = sk->min_type; 1161ac8e9819SChris Mason key.offset = sk->min_offset; 1162ac8e9819SChris Mason 1163ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1164ac8e9819SChris Mason max_key.type = sk->max_type; 1165ac8e9819SChris Mason max_key.offset = sk->max_offset; 1166ac8e9819SChris Mason 1167ac8e9819SChris Mason path->keep_locks = 1; 1168ac8e9819SChris Mason 1169ac8e9819SChris Mason while(1) { 1170ac8e9819SChris Mason ret = btrfs_search_forward(root, &key, &max_key, path, 0, 1171ac8e9819SChris Mason sk->min_transid); 1172ac8e9819SChris Mason if (ret != 0) { 1173ac8e9819SChris Mason if (ret > 0) 1174ac8e9819SChris Mason ret = 0; 1175ac8e9819SChris Mason goto err; 1176ac8e9819SChris Mason } 1177ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1178ac8e9819SChris Mason &sk_offset, &num_found); 1179ac8e9819SChris Mason btrfs_release_path(root, path); 1180ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1181ac8e9819SChris Mason break; 1182ac8e9819SChris Mason 1183ac8e9819SChris Mason } 1184ac8e9819SChris Mason ret = 0; 1185ac8e9819SChris Mason err: 1186ac8e9819SChris Mason sk->nr_items = num_found; 1187ac8e9819SChris Mason btrfs_free_path(path); 1188ac8e9819SChris Mason return ret; 1189ac8e9819SChris Mason } 1190ac8e9819SChris Mason 1191ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1192ac8e9819SChris Mason void __user *argp) 1193ac8e9819SChris Mason { 1194ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1195ac8e9819SChris Mason struct inode *inode; 1196ac8e9819SChris Mason int ret; 1197ac8e9819SChris Mason 1198ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1199ac8e9819SChris Mason return -EPERM; 1200ac8e9819SChris Mason 12012354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 12022354d08fSJulia Lawall if (IS_ERR(args)) 12032354d08fSJulia Lawall return PTR_ERR(args); 1204ac8e9819SChris Mason 1205ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1206ac8e9819SChris Mason ret = search_ioctl(inode, args); 1207ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1208ac8e9819SChris Mason ret = -EFAULT; 1209ac8e9819SChris Mason kfree(args); 1210ac8e9819SChris Mason return ret; 1211ac8e9819SChris Mason } 1212ac8e9819SChris Mason 121398d377a0STARUISI Hiroaki /* 1214ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1215ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 121698d377a0STARUISI Hiroaki */ 121798d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 121898d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 121998d377a0STARUISI Hiroaki { 122098d377a0STARUISI Hiroaki struct btrfs_root *root; 122198d377a0STARUISI Hiroaki struct btrfs_key key; 1222ac8e9819SChris Mason char *ptr; 122398d377a0STARUISI Hiroaki int ret = -1; 122498d377a0STARUISI Hiroaki int slot; 122598d377a0STARUISI Hiroaki int len; 122698d377a0STARUISI Hiroaki int total_len = 0; 122798d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 122898d377a0STARUISI Hiroaki struct extent_buffer *l; 122998d377a0STARUISI Hiroaki struct btrfs_path *path; 123098d377a0STARUISI Hiroaki 123198d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 123298d377a0STARUISI Hiroaki name[0]='\0'; 123398d377a0STARUISI Hiroaki return 0; 123498d377a0STARUISI Hiroaki } 123598d377a0STARUISI Hiroaki 123698d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 123798d377a0STARUISI Hiroaki if (!path) 123898d377a0STARUISI Hiroaki return -ENOMEM; 123998d377a0STARUISI Hiroaki 1240ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 124198d377a0STARUISI Hiroaki 124298d377a0STARUISI Hiroaki key.objectid = tree_id; 124398d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 124498d377a0STARUISI Hiroaki key.offset = (u64)-1; 124598d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 124698d377a0STARUISI Hiroaki if (IS_ERR(root)) { 124798d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 12488ad6fcabSChris Mason ret = -ENOENT; 12498ad6fcabSChris Mason goto out; 125098d377a0STARUISI Hiroaki } 125198d377a0STARUISI Hiroaki 125298d377a0STARUISI Hiroaki key.objectid = dirid; 125398d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 12548ad6fcabSChris Mason key.offset = (u64)-1; 125598d377a0STARUISI Hiroaki 125698d377a0STARUISI Hiroaki while(1) { 125798d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 125898d377a0STARUISI Hiroaki if (ret < 0) 125998d377a0STARUISI Hiroaki goto out; 126098d377a0STARUISI Hiroaki 126198d377a0STARUISI Hiroaki l = path->nodes[0]; 126298d377a0STARUISI Hiroaki slot = path->slots[0]; 12638ad6fcabSChris Mason if (ret > 0 && slot > 0) 12648ad6fcabSChris Mason slot--; 126598d377a0STARUISI Hiroaki btrfs_item_key_to_cpu(l, &key, slot); 126698d377a0STARUISI Hiroaki 126798d377a0STARUISI Hiroaki if (ret > 0 && (key.objectid != dirid || 1268ac8e9819SChris Mason key.type != BTRFS_INODE_REF_KEY)) { 1269ac8e9819SChris Mason ret = -ENOENT; 127098d377a0STARUISI Hiroaki goto out; 1271ac8e9819SChris Mason } 127298d377a0STARUISI Hiroaki 127398d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 127498d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 127598d377a0STARUISI Hiroaki ptr -= len + 1; 127698d377a0STARUISI Hiroaki total_len += len + 1; 1277ac8e9819SChris Mason if (ptr < name) 127898d377a0STARUISI Hiroaki goto out; 127998d377a0STARUISI Hiroaki 128098d377a0STARUISI Hiroaki *(ptr + len) = '/'; 128198d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 128298d377a0STARUISI Hiroaki 128398d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 128498d377a0STARUISI Hiroaki break; 128598d377a0STARUISI Hiroaki 128698d377a0STARUISI Hiroaki btrfs_release_path(root, path); 128798d377a0STARUISI Hiroaki key.objectid = key.offset; 12888ad6fcabSChris Mason key.offset = (u64)-1; 128998d377a0STARUISI Hiroaki dirid = key.objectid; 129098d377a0STARUISI Hiroaki 129198d377a0STARUISI Hiroaki } 1292ac8e9819SChris Mason if (ptr < name) 129398d377a0STARUISI Hiroaki goto out; 1294ac8e9819SChris Mason memcpy(name, ptr, total_len); 129598d377a0STARUISI Hiroaki name[total_len]='\0'; 129698d377a0STARUISI Hiroaki ret = 0; 129798d377a0STARUISI Hiroaki out: 129898d377a0STARUISI Hiroaki btrfs_free_path(path); 1299ac8e9819SChris Mason return ret; 1300ac8e9819SChris Mason } 1301ac8e9819SChris Mason 1302ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 1303ac8e9819SChris Mason void __user *argp) 1304ac8e9819SChris Mason { 1305ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 1306ac8e9819SChris Mason struct inode *inode; 1307ac8e9819SChris Mason int ret; 1308ac8e9819SChris Mason 1309ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1310ac8e9819SChris Mason return -EPERM; 1311ac8e9819SChris Mason 13122354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 13132354d08fSJulia Lawall if (IS_ERR(args)) 13142354d08fSJulia Lawall return PTR_ERR(args); 1315c2b96929SDan Carpenter 1316ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1317ac8e9819SChris Mason 13181b53ac4dSChris Mason if (args->treeid == 0) 13191b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 13201b53ac4dSChris Mason 1321ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 1322ac8e9819SChris Mason args->treeid, args->objectid, 1323ac8e9819SChris Mason args->name); 1324ac8e9819SChris Mason 1325ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1326ac8e9819SChris Mason ret = -EFAULT; 1327ac8e9819SChris Mason 1328ac8e9819SChris Mason kfree(args); 132998d377a0STARUISI Hiroaki return ret; 133098d377a0STARUISI Hiroaki } 133198d377a0STARUISI Hiroaki 133276dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 133376dda93cSYan, Zheng void __user *arg) 133476dda93cSYan, Zheng { 133576dda93cSYan, Zheng struct dentry *parent = fdentry(file); 133676dda93cSYan, Zheng struct dentry *dentry; 133776dda93cSYan, Zheng struct inode *dir = parent->d_inode; 133876dda93cSYan, Zheng struct inode *inode; 133976dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 134076dda93cSYan, Zheng struct btrfs_root *dest = NULL; 134176dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 134276dda93cSYan, Zheng struct btrfs_trans_handle *trans; 134376dda93cSYan, Zheng int namelen; 134476dda93cSYan, Zheng int ret; 134576dda93cSYan, Zheng int err = 0; 134676dda93cSYan, Zheng 134776dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 134876dda93cSYan, Zheng if (IS_ERR(vol_args)) 134976dda93cSYan, Zheng return PTR_ERR(vol_args); 135076dda93cSYan, Zheng 135176dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 135276dda93cSYan, Zheng namelen = strlen(vol_args->name); 135376dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 135476dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 135576dda93cSYan, Zheng err = -EINVAL; 135676dda93cSYan, Zheng goto out; 135776dda93cSYan, Zheng } 135876dda93cSYan, Zheng 135976dda93cSYan, Zheng err = mnt_want_write(file->f_path.mnt); 136076dda93cSYan, Zheng if (err) 136176dda93cSYan, Zheng goto out; 136276dda93cSYan, Zheng 136376dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 136476dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 136576dda93cSYan, Zheng if (IS_ERR(dentry)) { 136676dda93cSYan, Zheng err = PTR_ERR(dentry); 136776dda93cSYan, Zheng goto out_unlock_dir; 136876dda93cSYan, Zheng } 136976dda93cSYan, Zheng 137076dda93cSYan, Zheng if (!dentry->d_inode) { 137176dda93cSYan, Zheng err = -ENOENT; 137276dda93cSYan, Zheng goto out_dput; 137376dda93cSYan, Zheng } 137476dda93cSYan, Zheng 137576dda93cSYan, Zheng inode = dentry->d_inode; 1376*4260f7c7SSage Weil dest = BTRFS_I(inode)->root; 1377*4260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)){ 1378*4260f7c7SSage Weil /* 1379*4260f7c7SSage Weil * Regular user. Only allow this with a special mount 1380*4260f7c7SSage Weil * option, when the user has write+exec access to the 1381*4260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 1382*4260f7c7SSage Weil * allowed. 1383*4260f7c7SSage Weil * 1384*4260f7c7SSage Weil * Note that this is _not_ check that the subvol is 1385*4260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 1386*4260f7c7SSage Weil * otherwise be able to delete. 1387*4260f7c7SSage Weil * 1388*4260f7c7SSage Weil * Users who want to delete empty subvols should try 1389*4260f7c7SSage Weil * rmdir(2). 1390*4260f7c7SSage Weil */ 1391*4260f7c7SSage Weil err = -EPERM; 1392*4260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 1393*4260f7c7SSage Weil goto out_dput; 1394*4260f7c7SSage Weil 1395*4260f7c7SSage Weil /* 1396*4260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 1397*4260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 1398*4260f7c7SSage Weil * must be called on the dentry referencing the root 1399*4260f7c7SSage Weil * of the subvol, not a random directory contained 1400*4260f7c7SSage Weil * within it. 1401*4260f7c7SSage Weil */ 1402*4260f7c7SSage Weil err = -EINVAL; 1403*4260f7c7SSage Weil if (root == dest) 1404*4260f7c7SSage Weil goto out_dput; 1405*4260f7c7SSage Weil 1406*4260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 1407*4260f7c7SSage Weil if (err) 1408*4260f7c7SSage Weil goto out_dput; 1409*4260f7c7SSage Weil 1410*4260f7c7SSage Weil /* check if subvolume may be deleted by a non-root user */ 1411*4260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 1412*4260f7c7SSage Weil if (err) 1413*4260f7c7SSage Weil goto out_dput; 1414*4260f7c7SSage Weil } 1415*4260f7c7SSage Weil 141676dda93cSYan, Zheng if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { 141776dda93cSYan, Zheng err = -EINVAL; 141876dda93cSYan, Zheng goto out_dput; 141976dda93cSYan, Zheng } 142076dda93cSYan, Zheng 142176dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 142276dda93cSYan, Zheng err = d_invalidate(dentry); 142376dda93cSYan, Zheng if (err) 142476dda93cSYan, Zheng goto out_unlock; 142576dda93cSYan, Zheng 142676dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 142776dda93cSYan, Zheng 142876dda93cSYan, Zheng err = may_destroy_subvol(dest); 142976dda93cSYan, Zheng if (err) 143076dda93cSYan, Zheng goto out_up_write; 143176dda93cSYan, Zheng 1432a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 1433a22285a6SYan, Zheng if (IS_ERR(trans)) { 1434a22285a6SYan, Zheng err = PTR_ERR(trans); 1435d327099aSDan Carpenter goto out_up_write; 1436a22285a6SYan, Zheng } 1437a22285a6SYan, Zheng trans->block_rsv = &root->fs_info->global_block_rsv; 1438a22285a6SYan, Zheng 143976dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 144076dda93cSYan, Zheng dest->root_key.objectid, 144176dda93cSYan, Zheng dentry->d_name.name, 144276dda93cSYan, Zheng dentry->d_name.len); 144376dda93cSYan, Zheng BUG_ON(ret); 144476dda93cSYan, Zheng 144576dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 144676dda93cSYan, Zheng 144776dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 144876dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 144976dda93cSYan, Zheng dest->root_item.drop_level = 0; 145076dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 145176dda93cSYan, Zheng 1452d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 145376dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 145476dda93cSYan, Zheng root->fs_info->tree_root, 145576dda93cSYan, Zheng dest->root_key.objectid); 145676dda93cSYan, Zheng BUG_ON(ret); 1457d68fc57bSYan, Zheng } 145876dda93cSYan, Zheng 1459531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 146076dda93cSYan, Zheng BUG_ON(ret); 146176dda93cSYan, Zheng inode->i_flags |= S_DEAD; 146276dda93cSYan, Zheng out_up_write: 146376dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 146476dda93cSYan, Zheng out_unlock: 146576dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 146676dda93cSYan, Zheng if (!err) { 1467efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 146876dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 146976dda93cSYan, Zheng d_delete(dentry); 147076dda93cSYan, Zheng } 147176dda93cSYan, Zheng out_dput: 147276dda93cSYan, Zheng dput(dentry); 147376dda93cSYan, Zheng out_unlock_dir: 147476dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 147576dda93cSYan, Zheng mnt_drop_write(file->f_path.mnt); 147676dda93cSYan, Zheng out: 147776dda93cSYan, Zheng kfree(vol_args); 147876dda93cSYan, Zheng return err; 147976dda93cSYan, Zheng } 148076dda93cSYan, Zheng 14811e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 1482f46b5a66SChristoph Hellwig { 1483f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1484f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 14851e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 1486c146afadSYan Zheng int ret; 1487c146afadSYan Zheng 1488c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1489c146afadSYan Zheng if (ret) 1490c146afadSYan Zheng return ret; 1491f46b5a66SChristoph Hellwig 1492f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 1493f46b5a66SChristoph Hellwig case S_IFDIR: 1494e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 1495e441d54dSChris Mason ret = -EPERM; 1496e441d54dSChris Mason goto out; 1497e441d54dSChris Mason } 14988929ecfaSYan, Zheng ret = btrfs_defrag_root(root, 0); 14998929ecfaSYan, Zheng if (ret) 15008929ecfaSYan, Zheng goto out; 15018929ecfaSYan, Zheng ret = btrfs_defrag_root(root->fs_info->extent_root, 0); 1502f46b5a66SChristoph Hellwig break; 1503f46b5a66SChristoph Hellwig case S_IFREG: 1504e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 1505e441d54dSChris Mason ret = -EINVAL; 1506e441d54dSChris Mason goto out; 1507e441d54dSChris Mason } 15081e701a32SChris Mason 15091e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 15101e701a32SChris Mason if (!range) { 15111e701a32SChris Mason ret = -ENOMEM; 15121e701a32SChris Mason goto out; 15131e701a32SChris Mason } 15141e701a32SChris Mason 15151e701a32SChris Mason if (argp) { 15161e701a32SChris Mason if (copy_from_user(range, argp, 15171e701a32SChris Mason sizeof(*range))) { 15181e701a32SChris Mason ret = -EFAULT; 15191e701a32SChris Mason kfree(range); 1520683be16eSDan Carpenter goto out; 15211e701a32SChris Mason } 15221e701a32SChris Mason /* compression requires us to start the IO */ 15231e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 15241e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 15251e701a32SChris Mason range->extent_thresh = (u32)-1; 15261e701a32SChris Mason } 15271e701a32SChris Mason } else { 15281e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 15291e701a32SChris Mason range->len = (u64)-1; 15301e701a32SChris Mason } 15318929ecfaSYan, Zheng ret = btrfs_defrag_file(file, range); 15321e701a32SChris Mason kfree(range); 1533f46b5a66SChristoph Hellwig break; 15348929ecfaSYan, Zheng default: 15358929ecfaSYan, Zheng ret = -EINVAL; 1536f46b5a66SChristoph Hellwig } 1537e441d54dSChris Mason out: 1538ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1539e441d54dSChris Mason return ret; 1540f46b5a66SChristoph Hellwig } 1541f46b5a66SChristoph Hellwig 1542b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 1543f46b5a66SChristoph Hellwig { 1544f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1545f46b5a66SChristoph Hellwig int ret; 1546f46b5a66SChristoph Hellwig 1547e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1548e441d54dSChris Mason return -EPERM; 1549e441d54dSChris Mason 1550dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1551dae7b665SLi Zefan if (IS_ERR(vol_args)) 1552dae7b665SLi Zefan return PTR_ERR(vol_args); 1553f46b5a66SChristoph Hellwig 15545516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1555f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 1556f46b5a66SChristoph Hellwig 1557f46b5a66SChristoph Hellwig kfree(vol_args); 1558f46b5a66SChristoph Hellwig return ret; 1559f46b5a66SChristoph Hellwig } 1560f46b5a66SChristoph Hellwig 1561b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 1562f46b5a66SChristoph Hellwig { 1563f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1564f46b5a66SChristoph Hellwig int ret; 1565f46b5a66SChristoph Hellwig 1566e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1567e441d54dSChris Mason return -EPERM; 1568e441d54dSChris Mason 1569c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1570c146afadSYan Zheng return -EROFS; 1571c146afadSYan Zheng 1572dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1573dae7b665SLi Zefan if (IS_ERR(vol_args)) 1574dae7b665SLi Zefan return PTR_ERR(vol_args); 1575f46b5a66SChristoph Hellwig 15765516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1577f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 1578f46b5a66SChristoph Hellwig 1579f46b5a66SChristoph Hellwig kfree(vol_args); 1580f46b5a66SChristoph Hellwig return ret; 1581f46b5a66SChristoph Hellwig } 1582f46b5a66SChristoph Hellwig 158376dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 1584b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 1585f46b5a66SChristoph Hellwig { 1586f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1587f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1588f46b5a66SChristoph Hellwig struct file *src_file; 1589f46b5a66SChristoph Hellwig struct inode *src; 1590f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1591f46b5a66SChristoph Hellwig struct btrfs_path *path; 1592f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 1593ae01a0abSYan Zheng char *buf; 1594ae01a0abSYan Zheng struct btrfs_key key; 1595f46b5a66SChristoph Hellwig u32 nritems; 1596f46b5a66SChristoph Hellwig int slot; 1597ae01a0abSYan Zheng int ret; 1598c5c9cd4dSSage Weil u64 len = olen; 1599c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 1600c5c9cd4dSSage Weil u64 hint_byte; 1601d20f7043SChris Mason 1602c5c9cd4dSSage Weil /* 1603c5c9cd4dSSage Weil * TODO: 1604c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 1605c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 1606c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 1607c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 1608c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 1609c5c9cd4dSSage Weil * they don't overlap)? 1610c5c9cd4dSSage Weil */ 1611c5c9cd4dSSage Weil 1612e441d54dSChris Mason /* the destination must be opened for writing */ 16132ebc3464SDan Rosenberg if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 1614e441d54dSChris Mason return -EINVAL; 1615e441d54dSChris Mason 1616c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1617c146afadSYan Zheng if (ret) 1618c146afadSYan Zheng return ret; 1619c146afadSYan Zheng 1620c5c9cd4dSSage Weil src_file = fget(srcfd); 1621ab67b7c1SYan Zheng if (!src_file) { 1622ab67b7c1SYan Zheng ret = -EBADF; 1623ab67b7c1SYan Zheng goto out_drop_write; 1624ab67b7c1SYan Zheng } 16255dc64164SDan Rosenberg 1626f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 1627f46b5a66SChristoph Hellwig 1628c5c9cd4dSSage Weil ret = -EINVAL; 1629c5c9cd4dSSage Weil if (src == inode) 1630c5c9cd4dSSage Weil goto out_fput; 1631c5c9cd4dSSage Weil 16325dc64164SDan Rosenberg /* the src must be open for reading */ 16335dc64164SDan Rosenberg if (!(src_file->f_mode & FMODE_READ)) 16345dc64164SDan Rosenberg goto out_fput; 16355dc64164SDan Rosenberg 1636ae01a0abSYan Zheng ret = -EISDIR; 1637ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 1638f46b5a66SChristoph Hellwig goto out_fput; 1639f46b5a66SChristoph Hellwig 1640ae01a0abSYan Zheng ret = -EXDEV; 1641ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 1642ae01a0abSYan Zheng goto out_fput; 1643ae01a0abSYan Zheng 1644ae01a0abSYan Zheng ret = -ENOMEM; 1645ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 1646ae01a0abSYan Zheng if (!buf) 1647ae01a0abSYan Zheng goto out_fput; 1648ae01a0abSYan Zheng 1649ae01a0abSYan Zheng path = btrfs_alloc_path(); 1650ae01a0abSYan Zheng if (!path) { 1651ae01a0abSYan Zheng vfree(buf); 1652ae01a0abSYan Zheng goto out_fput; 1653ae01a0abSYan Zheng } 1654ae01a0abSYan Zheng path->reada = 2; 1655ae01a0abSYan Zheng 1656f46b5a66SChristoph Hellwig if (inode < src) { 1657fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 1658fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 1659f46b5a66SChristoph Hellwig } else { 1660fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 1661fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 1662f46b5a66SChristoph Hellwig } 1663f46b5a66SChristoph Hellwig 1664c5c9cd4dSSage Weil /* determine range to clone */ 1665c5c9cd4dSSage Weil ret = -EINVAL; 16662ebc3464SDan Rosenberg if (off + len > src->i_size || off + len < off) 1667f46b5a66SChristoph Hellwig goto out_unlock; 1668c5c9cd4dSSage Weil if (len == 0) 1669c5c9cd4dSSage Weil olen = len = src->i_size - off; 1670c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 1671c5c9cd4dSSage Weil if (off + len == src->i_size) 1672c5c9cd4dSSage Weil len = ((src->i_size + bs-1) & ~(bs-1)) 1673c5c9cd4dSSage Weil - off; 1674c5c9cd4dSSage Weil 1675c5c9cd4dSSage Weil /* verify the end result is block aligned */ 1676c5c9cd4dSSage Weil if ((off & (bs-1)) || 1677c5c9cd4dSSage Weil ((off + len) & (bs-1))) 1678c5c9cd4dSSage Weil goto out_unlock; 1679c5c9cd4dSSage Weil 1680f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 1681f46b5a66SChristoph Hellwig another, and lock file content */ 1682f46b5a66SChristoph Hellwig while (1) { 168331840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 1684c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 16859a019196SSage Weil ordered = btrfs_lookup_first_ordered_extent(src, off+len); 16869a019196SSage Weil if (!ordered && 16879a019196SSage Weil !test_range_bit(&BTRFS_I(src)->io_tree, off, off+len, 16889a019196SSage Weil EXTENT_DELALLOC, 0, NULL)) 1689f46b5a66SChristoph Hellwig break; 1690c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1691ae01a0abSYan Zheng if (ordered) 1692ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 16939a019196SSage Weil btrfs_wait_ordered_range(src, off, len); 1694f46b5a66SChristoph Hellwig } 1695f46b5a66SChristoph Hellwig 1696c5c9cd4dSSage Weil /* clone data */ 1697f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 1698ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 1699ae01a0abSYan Zheng key.offset = 0; 1700f46b5a66SChristoph Hellwig 1701f46b5a66SChristoph Hellwig while (1) { 1702f46b5a66SChristoph Hellwig /* 1703f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 1704f46b5a66SChristoph Hellwig * tree. 1705f46b5a66SChristoph Hellwig */ 1706a22285a6SYan, Zheng ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 1707f46b5a66SChristoph Hellwig if (ret < 0) 1708f46b5a66SChristoph Hellwig goto out; 1709f46b5a66SChristoph Hellwig 1710ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1711ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 1712f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 1713f46b5a66SChristoph Hellwig if (ret < 0) 1714f46b5a66SChristoph Hellwig goto out; 1715f46b5a66SChristoph Hellwig if (ret > 0) 1716f46b5a66SChristoph Hellwig break; 1717ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1718f46b5a66SChristoph Hellwig } 1719f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 1720f46b5a66SChristoph Hellwig slot = path->slots[0]; 1721f46b5a66SChristoph Hellwig 1722ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 1723d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 1724f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 1725f46b5a66SChristoph Hellwig break; 1726f46b5a66SChristoph Hellwig 1727c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 1728c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 1729c5c9cd4dSSage Weil int type; 173031840ae1SZheng Yan u32 size; 173131840ae1SZheng Yan struct btrfs_key new_key; 1732c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 1733c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 1734c5c9cd4dSSage Weil u8 comp; 1735b5384d48SSage Weil u64 endoff; 173631840ae1SZheng Yan 173731840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 173831840ae1SZheng Yan read_extent_buffer(leaf, buf, 173931840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 174031840ae1SZheng Yan size); 1741c5c9cd4dSSage Weil 1742c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 1743c5c9cd4dSSage Weil struct btrfs_file_extent_item); 1744c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 1745c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 1746c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1747c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 1748d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 1749d397712bSChris Mason extent); 1750d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 1751d397712bSChris Mason extent); 1752c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 1753d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 1754d397712bSChris Mason extent); 1755c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1756c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 1757c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 1758c5c9cd4dSSage Weil extent); 1759c5c9cd4dSSage Weil } 176031840ae1SZheng Yan btrfs_release_path(root, path); 176131840ae1SZheng Yan 1762050006a7SSage Weil if (key.offset + datal <= off || 1763c5c9cd4dSSage Weil key.offset >= off+len) 1764c5c9cd4dSSage Weil goto next; 1765c5c9cd4dSSage Weil 176631840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 176731840ae1SZheng Yan new_key.objectid = inode->i_ino; 1768c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 1769c5c9cd4dSSage Weil 1770a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 1); 1771a22285a6SYan, Zheng if (IS_ERR(trans)) { 1772a22285a6SYan, Zheng ret = PTR_ERR(trans); 1773a22285a6SYan, Zheng goto out; 1774a22285a6SYan, Zheng } 1775a22285a6SYan, Zheng 1776c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1777c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 1778a22285a6SYan, Zheng if (off > key.offset) { 1779a22285a6SYan, Zheng datao += off - key.offset; 1780a22285a6SYan, Zheng datal -= off - key.offset; 1781a22285a6SYan, Zheng } 1782a22285a6SYan, Zheng 1783a22285a6SYan, Zheng if (key.offset + datal > off + len) 1784a22285a6SYan, Zheng datal = off + len - key.offset; 1785a22285a6SYan, Zheng 1786a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 1787a22285a6SYan, Zheng new_key.offset, 1788a22285a6SYan, Zheng new_key.offset + datal, 1789a22285a6SYan, Zheng &hint_byte, 1); 1790a22285a6SYan, Zheng BUG_ON(ret); 1791a22285a6SYan, Zheng 179231840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 179331840ae1SZheng Yan &new_key, size); 1794a22285a6SYan, Zheng BUG_ON(ret); 179531840ae1SZheng Yan 179631840ae1SZheng Yan leaf = path->nodes[0]; 179731840ae1SZheng Yan slot = path->slots[0]; 179831840ae1SZheng Yan write_extent_buffer(leaf, buf, 179931840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 180031840ae1SZheng Yan size); 1801ae01a0abSYan Zheng 1802f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 1803f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 1804c5c9cd4dSSage Weil 1805c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 1806c5c9cd4dSSage Weil if (!disko) 1807c5c9cd4dSSage Weil datao = 0; 1808c5c9cd4dSSage Weil 1809c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 1810c5c9cd4dSSage Weil datao); 1811c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 1812c5c9cd4dSSage Weil datal); 1813c5c9cd4dSSage Weil if (disko) { 1814c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1815ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 18165d4f98a2SYan Zheng disko, diskl, 0, 1817f46b5a66SChristoph Hellwig root->root_key.objectid, 18185d4f98a2SYan Zheng inode->i_ino, 18195d4f98a2SYan Zheng new_key.offset - datao); 1820ae01a0abSYan Zheng BUG_ON(ret); 1821f46b5a66SChristoph Hellwig } 1822c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1823c5c9cd4dSSage Weil u64 skip = 0; 1824c5c9cd4dSSage Weil u64 trim = 0; 1825c5c9cd4dSSage Weil if (off > key.offset) { 1826c5c9cd4dSSage Weil skip = off - key.offset; 1827c5c9cd4dSSage Weil new_key.offset += skip; 182831840ae1SZheng Yan } 1829d397712bSChris Mason 1830c5c9cd4dSSage Weil if (key.offset + datal > off+len) 1831c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 1832d397712bSChris Mason 1833c5c9cd4dSSage Weil if (comp && (skip || trim)) { 1834c5c9cd4dSSage Weil ret = -EINVAL; 1835a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 1836c5c9cd4dSSage Weil goto out; 183731840ae1SZheng Yan } 1838c5c9cd4dSSage Weil size -= skip + trim; 1839c5c9cd4dSSage Weil datal -= skip + trim; 1840a22285a6SYan, Zheng 1841a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 1842a22285a6SYan, Zheng new_key.offset, 1843a22285a6SYan, Zheng new_key.offset + datal, 1844a22285a6SYan, Zheng &hint_byte, 1); 1845a22285a6SYan, Zheng BUG_ON(ret); 1846a22285a6SYan, Zheng 1847c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 1848c5c9cd4dSSage Weil &new_key, size); 1849a22285a6SYan, Zheng BUG_ON(ret); 1850c5c9cd4dSSage Weil 1851c5c9cd4dSSage Weil if (skip) { 1852d397712bSChris Mason u32 start = 1853d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 1854c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 1855c5c9cd4dSSage Weil datal); 1856c5c9cd4dSSage Weil } 1857c5c9cd4dSSage Weil 1858c5c9cd4dSSage Weil leaf = path->nodes[0]; 1859c5c9cd4dSSage Weil slot = path->slots[0]; 1860c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 1861c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 1862c5c9cd4dSSage Weil size); 1863c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 1864c5c9cd4dSSage Weil } 1865c5c9cd4dSSage Weil 1866c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 1867a22285a6SYan, Zheng btrfs_release_path(root, path); 1868c5c9cd4dSSage Weil 1869a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 1870b5384d48SSage Weil 1871b5384d48SSage Weil /* 1872b5384d48SSage Weil * we round up to the block size at eof when 1873b5384d48SSage Weil * determining which extents to clone above, 1874b5384d48SSage Weil * but shouldn't round up the file size 1875b5384d48SSage Weil */ 1876b5384d48SSage Weil endoff = new_key.offset + datal; 1877b5384d48SSage Weil if (endoff > off+olen) 1878b5384d48SSage Weil endoff = off+olen; 1879b5384d48SSage Weil if (endoff > inode->i_size) 1880b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 1881b5384d48SSage Weil 1882a22285a6SYan, Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 1883a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 1884a22285a6SYan, Zheng BUG_ON(ret); 1885a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 1886a22285a6SYan, Zheng } 1887c5c9cd4dSSage Weil next: 188831840ae1SZheng Yan btrfs_release_path(root, path); 1889ae01a0abSYan Zheng key.offset++; 1890ae01a0abSYan Zheng } 1891f46b5a66SChristoph Hellwig ret = 0; 1892f46b5a66SChristoph Hellwig out: 1893ae01a0abSYan Zheng btrfs_release_path(root, path); 1894c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1895f46b5a66SChristoph Hellwig out_unlock: 1896f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 1897f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 1898ae01a0abSYan Zheng vfree(buf); 1899ae01a0abSYan Zheng btrfs_free_path(path); 1900f46b5a66SChristoph Hellwig out_fput: 1901f46b5a66SChristoph Hellwig fput(src_file); 1902ab67b7c1SYan Zheng out_drop_write: 1903ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1904f46b5a66SChristoph Hellwig return ret; 1905f46b5a66SChristoph Hellwig } 1906f46b5a66SChristoph Hellwig 19077a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 1908c5c9cd4dSSage Weil { 1909c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 1910c5c9cd4dSSage Weil 19117a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 1912c5c9cd4dSSage Weil return -EFAULT; 1913c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 1914c5c9cd4dSSage Weil args.src_length, args.dest_offset); 1915c5c9cd4dSSage Weil } 1916c5c9cd4dSSage Weil 1917f46b5a66SChristoph Hellwig /* 1918f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1919f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1920f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1921f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1922f46b5a66SChristoph Hellwig */ 1923b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 1924f46b5a66SChristoph Hellwig { 1925f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1926f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1927f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 19281ab86aedSSage Weil int ret; 1929f46b5a66SChristoph Hellwig 19301ab86aedSSage Weil ret = -EPERM; 1931df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 1932f46b5a66SChristoph Hellwig goto out; 19331ab86aedSSage Weil 19341ab86aedSSage Weil ret = -EINPROGRESS; 19351ab86aedSSage Weil if (file->private_data) 19361ab86aedSSage Weil goto out; 19379ca9ee09SSage Weil 1938c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1939c146afadSYan Zheng if (ret) 1940c146afadSYan Zheng goto out; 1941c146afadSYan Zheng 19429ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 19439ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 19449ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 19459ca9ee09SSage Weil 1946f46b5a66SChristoph Hellwig ret = -ENOMEM; 19471ab86aedSSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 19481ab86aedSSage Weil if (!trans) 19491ab86aedSSage Weil goto out_drop; 19501ab86aedSSage Weil 19511ab86aedSSage Weil file->private_data = trans; 19521ab86aedSSage Weil return 0; 19531ab86aedSSage Weil 19541ab86aedSSage Weil out_drop: 19551ab86aedSSage Weil mutex_lock(&root->fs_info->trans_mutex); 19561ab86aedSSage Weil root->fs_info->open_ioctl_trans--; 19571ab86aedSSage Weil mutex_unlock(&root->fs_info->trans_mutex); 19581ab86aedSSage Weil mnt_drop_write(file->f_path.mnt); 1959f46b5a66SChristoph Hellwig out: 1960f46b5a66SChristoph Hellwig return ret; 1961f46b5a66SChristoph Hellwig } 1962f46b5a66SChristoph Hellwig 19636ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 19646ef5ed0dSJosef Bacik { 19656ef5ed0dSJosef Bacik struct inode *inode = fdentry(file)->d_inode; 19666ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 19676ef5ed0dSJosef Bacik struct btrfs_root *new_root; 19686ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 19696ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 19706ef5ed0dSJosef Bacik struct btrfs_path *path; 19716ef5ed0dSJosef Bacik struct btrfs_key location; 19726ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 19736ef5ed0dSJosef Bacik struct btrfs_super_block *disk_super; 19746ef5ed0dSJosef Bacik u64 features; 19756ef5ed0dSJosef Bacik u64 objectid = 0; 19766ef5ed0dSJosef Bacik u64 dir_id; 19776ef5ed0dSJosef Bacik 19786ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 19796ef5ed0dSJosef Bacik return -EPERM; 19806ef5ed0dSJosef Bacik 19816ef5ed0dSJosef Bacik if (copy_from_user(&objectid, argp, sizeof(objectid))) 19826ef5ed0dSJosef Bacik return -EFAULT; 19836ef5ed0dSJosef Bacik 19846ef5ed0dSJosef Bacik if (!objectid) 19856ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 19866ef5ed0dSJosef Bacik 19876ef5ed0dSJosef Bacik location.objectid = objectid; 19886ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 19896ef5ed0dSJosef Bacik location.offset = (u64)-1; 19906ef5ed0dSJosef Bacik 19916ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 19926ef5ed0dSJosef Bacik if (IS_ERR(new_root)) 19936ef5ed0dSJosef Bacik return PTR_ERR(new_root); 19946ef5ed0dSJosef Bacik 19956ef5ed0dSJosef Bacik if (btrfs_root_refs(&new_root->root_item) == 0) 19966ef5ed0dSJosef Bacik return -ENOENT; 19976ef5ed0dSJosef Bacik 19986ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 19996ef5ed0dSJosef Bacik if (!path) 20006ef5ed0dSJosef Bacik return -ENOMEM; 20016ef5ed0dSJosef Bacik path->leave_spinning = 1; 20026ef5ed0dSJosef Bacik 20036ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 20046ef5ed0dSJosef Bacik if (!trans) { 20056ef5ed0dSJosef Bacik btrfs_free_path(path); 20066ef5ed0dSJosef Bacik return -ENOMEM; 20076ef5ed0dSJosef Bacik } 20086ef5ed0dSJosef Bacik 20096ef5ed0dSJosef Bacik dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); 20106ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 20116ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 2012cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 20136ef5ed0dSJosef Bacik btrfs_free_path(path); 20146ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 20156ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 20166ef5ed0dSJosef Bacik "this isn't going to work\n"); 20176ef5ed0dSJosef Bacik return -ENOENT; 20186ef5ed0dSJosef Bacik } 20196ef5ed0dSJosef Bacik 20206ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 20216ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 20226ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 20236ef5ed0dSJosef Bacik btrfs_free_path(path); 20246ef5ed0dSJosef Bacik 20256ef5ed0dSJosef Bacik disk_super = &root->fs_info->super_copy; 20266ef5ed0dSJosef Bacik features = btrfs_super_incompat_flags(disk_super); 20276ef5ed0dSJosef Bacik if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { 20286ef5ed0dSJosef Bacik features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; 20296ef5ed0dSJosef Bacik btrfs_set_super_incompat_flags(disk_super, features); 20306ef5ed0dSJosef Bacik } 20316ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 20326ef5ed0dSJosef Bacik 20336ef5ed0dSJosef Bacik return 0; 20346ef5ed0dSJosef Bacik } 20356ef5ed0dSJosef Bacik 2036bf5fc093SJosef Bacik static void get_block_group_info(struct list_head *groups_list, 2037bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 2038bf5fc093SJosef Bacik { 2039bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 2040bf5fc093SJosef Bacik 2041bf5fc093SJosef Bacik space->total_bytes = 0; 2042bf5fc093SJosef Bacik space->used_bytes = 0; 2043bf5fc093SJosef Bacik space->flags = 0; 2044bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 2045bf5fc093SJosef Bacik space->flags = block_group->flags; 2046bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 2047bf5fc093SJosef Bacik space->used_bytes += 2048bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 2049bf5fc093SJosef Bacik } 2050bf5fc093SJosef Bacik } 2051bf5fc093SJosef Bacik 20521406e432SJosef Bacik long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 20531406e432SJosef Bacik { 20541406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 20551406e432SJosef Bacik struct btrfs_ioctl_space_info space; 20561406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 20577fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 20587fde62bfSChris Mason struct btrfs_ioctl_space_info *user_dest; 20591406e432SJosef Bacik struct btrfs_space_info *info; 2060bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 2061bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 2062bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 2063bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 2064bf5fc093SJosef Bacik int num_types = 4; 20657fde62bfSChris Mason int alloc_size; 20661406e432SJosef Bacik int ret = 0; 20677fde62bfSChris Mason int slot_count = 0; 2068bf5fc093SJosef Bacik int i, c; 20691406e432SJosef Bacik 20701406e432SJosef Bacik if (copy_from_user(&space_args, 20711406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 20721406e432SJosef Bacik sizeof(space_args))) 20731406e432SJosef Bacik return -EFAULT; 20741406e432SJosef Bacik 2075bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2076bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2077bf5fc093SJosef Bacik 2078bf5fc093SJosef Bacik info = NULL; 20797fde62bfSChris Mason rcu_read_lock(); 2080bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2081bf5fc093SJosef Bacik list) { 2082bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2083bf5fc093SJosef Bacik info = tmp; 2084bf5fc093SJosef Bacik break; 2085bf5fc093SJosef Bacik } 2086bf5fc093SJosef Bacik } 20877fde62bfSChris Mason rcu_read_unlock(); 20881406e432SJosef Bacik 2089bf5fc093SJosef Bacik if (!info) 2090bf5fc093SJosef Bacik continue; 2091bf5fc093SJosef Bacik 2092bf5fc093SJosef Bacik down_read(&info->groups_sem); 2093bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2094bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 2095bf5fc093SJosef Bacik slot_count++; 2096bf5fc093SJosef Bacik } 2097bf5fc093SJosef Bacik up_read(&info->groups_sem); 2098bf5fc093SJosef Bacik } 2099bf5fc093SJosef Bacik 21007fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 21017fde62bfSChris Mason if (space_args.space_slots == 0) { 21027fde62bfSChris Mason space_args.total_spaces = slot_count; 21037fde62bfSChris Mason goto out; 21047fde62bfSChris Mason } 2105bf5fc093SJosef Bacik 2106bf5fc093SJosef Bacik slot_count = min_t(int, space_args.space_slots, slot_count); 2107bf5fc093SJosef Bacik 21087fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 2109bf5fc093SJosef Bacik 21107fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 21117fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 21127fde62bfSChris Mason */ 21137fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 21147fde62bfSChris Mason return -ENOMEM; 21157fde62bfSChris Mason 21167fde62bfSChris Mason space_args.total_spaces = 0; 21177fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 21187fde62bfSChris Mason if (!dest) 21197fde62bfSChris Mason return -ENOMEM; 21207fde62bfSChris Mason dest_orig = dest; 21217fde62bfSChris Mason 21227fde62bfSChris Mason /* now we have a buffer to copy into */ 2123bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2124bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2125bf5fc093SJosef Bacik 2126bf5fc093SJosef Bacik info = NULL; 21271406e432SJosef Bacik rcu_read_lock(); 2128bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2129bf5fc093SJosef Bacik list) { 2130bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2131bf5fc093SJosef Bacik info = tmp; 21327fde62bfSChris Mason break; 2133bf5fc093SJosef Bacik } 2134bf5fc093SJosef Bacik } 2135bf5fc093SJosef Bacik rcu_read_unlock(); 21367fde62bfSChris Mason 2137bf5fc093SJosef Bacik if (!info) 2138bf5fc093SJosef Bacik continue; 2139bf5fc093SJosef Bacik down_read(&info->groups_sem); 2140bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2141bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 2142bf5fc093SJosef Bacik get_block_group_info(&info->block_groups[c], 2143bf5fc093SJosef Bacik &space); 21447fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 21451406e432SJosef Bacik dest++; 21461406e432SJosef Bacik space_args.total_spaces++; 21471406e432SJosef Bacik } 2148bf5fc093SJosef Bacik } 2149bf5fc093SJosef Bacik up_read(&info->groups_sem); 2150bf5fc093SJosef Bacik } 21511406e432SJosef Bacik 21527fde62bfSChris Mason user_dest = (struct btrfs_ioctl_space_info *) 21537fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 21547fde62bfSChris Mason 21557fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 21567fde62bfSChris Mason ret = -EFAULT; 21577fde62bfSChris Mason 21587fde62bfSChris Mason kfree(dest_orig); 21597fde62bfSChris Mason out: 21607fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 21611406e432SJosef Bacik ret = -EFAULT; 21621406e432SJosef Bacik 21631406e432SJosef Bacik return ret; 21641406e432SJosef Bacik } 21651406e432SJosef Bacik 2166f46b5a66SChristoph Hellwig /* 2167f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2168f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2169f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2170f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2171f46b5a66SChristoph Hellwig */ 2172f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 2173f46b5a66SChristoph Hellwig { 2174f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2175f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2176f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2177f46b5a66SChristoph Hellwig 2178f46b5a66SChristoph Hellwig trans = file->private_data; 21791ab86aedSSage Weil if (!trans) 21801ab86aedSSage Weil return -EINVAL; 2181b214107eSChristoph Hellwig file->private_data = NULL; 21829ca9ee09SSage Weil 21831ab86aedSSage Weil btrfs_end_transaction(trans, root); 21841ab86aedSSage Weil 21859ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 21869ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 21879ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 21889ca9ee09SSage Weil 2189cfc8ea87SSage Weil mnt_drop_write(file->f_path.mnt); 21901ab86aedSSage Weil return 0; 2191f46b5a66SChristoph Hellwig } 2192f46b5a66SChristoph Hellwig 219346204592SSage Weil static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp) 219446204592SSage Weil { 219546204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 219646204592SSage Weil struct btrfs_trans_handle *trans; 219746204592SSage Weil u64 transid; 219846204592SSage Weil 219946204592SSage Weil trans = btrfs_start_transaction(root, 0); 220046204592SSage Weil transid = trans->transid; 220146204592SSage Weil btrfs_commit_transaction_async(trans, root, 0); 220246204592SSage Weil 220346204592SSage Weil if (argp) 220446204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 220546204592SSage Weil return -EFAULT; 220646204592SSage Weil return 0; 220746204592SSage Weil } 220846204592SSage Weil 220946204592SSage Weil static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) 221046204592SSage Weil { 221146204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 221246204592SSage Weil u64 transid; 221346204592SSage Weil 221446204592SSage Weil if (argp) { 221546204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 221646204592SSage Weil return -EFAULT; 221746204592SSage Weil } else { 221846204592SSage Weil transid = 0; /* current trans */ 221946204592SSage Weil } 222046204592SSage Weil return btrfs_wait_for_commit(root, transid); 222146204592SSage Weil } 222246204592SSage Weil 2223f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 2224f46b5a66SChristoph Hellwig cmd, unsigned long arg) 2225f46b5a66SChristoph Hellwig { 2226f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 22274bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 2228f46b5a66SChristoph Hellwig 2229f46b5a66SChristoph Hellwig switch (cmd) { 22306cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 22316cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 22326cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 22336cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 22346cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 22356cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 2236f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 223772fd032eSSage Weil return btrfs_ioctl_snap_create(file, argp, 0, 0); 223872fd032eSSage Weil case BTRFS_IOC_SNAP_CREATE_ASYNC: 223972fd032eSSage Weil return btrfs_ioctl_snap_create(file, argp, 0, 1); 22403de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 224172fd032eSSage Weil return btrfs_ioctl_snap_create(file, argp, 1, 0); 224276dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 224376dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 22446ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 22456ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 2246f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 22471e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 22481e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 22491e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 2250f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 22514bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 2252f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 22534bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 2254f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 22554bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 2256f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 2257f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 2258f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 2259c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 2260c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 22617a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 2262f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 2263f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 2264f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 2265f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 2266ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 2267ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 2268ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 2269ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 22701406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 22711406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 2272f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 2273f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 2274f46b5a66SChristoph Hellwig return 0; 227546204592SSage Weil case BTRFS_IOC_START_SYNC: 227646204592SSage Weil return btrfs_ioctl_start_sync(file, argp); 227746204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 227846204592SSage Weil return btrfs_ioctl_wait_sync(file, argp); 2279f46b5a66SChristoph Hellwig } 2280f46b5a66SChristoph Hellwig 2281f46b5a66SChristoph Hellwig return -ENOTTY; 2282f46b5a66SChristoph Hellwig } 2283