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/smp_lock.h> 31f46b5a66SChristoph Hellwig #include <linux/backing-dev.h> 32cb8e7090SChristoph Hellwig #include <linux/mount.h> 33f46b5a66SChristoph Hellwig #include <linux/mpage.h> 34cb8e7090SChristoph Hellwig #include <linux/namei.h> 35f46b5a66SChristoph Hellwig #include <linux/swap.h> 36f46b5a66SChristoph Hellwig #include <linux/writeback.h> 37f46b5a66SChristoph Hellwig #include <linux/statfs.h> 38f46b5a66SChristoph Hellwig #include <linux/compat.h> 39f46b5a66SChristoph Hellwig #include <linux/bit_spinlock.h> 40cb8e7090SChristoph Hellwig #include <linux/security.h> 41f46b5a66SChristoph Hellwig #include <linux/xattr.h> 427ea394f1SYan Zheng #include <linux/vmalloc.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 53f46b5a66SChristoph Hellwig 54f46b5a66SChristoph Hellwig 55cb8e7090SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, 56cb8e7090SChristoph Hellwig struct dentry *dentry, 57cb8e7090SChristoph Hellwig char *name, int namelen) 58f46b5a66SChristoph Hellwig { 59f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 60f46b5a66SChristoph Hellwig struct btrfs_key key; 61f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 62f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 63f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 64f46b5a66SChristoph Hellwig struct btrfs_root *new_root = root; 65f46b5a66SChristoph Hellwig struct inode *dir; 66f46b5a66SChristoph Hellwig int ret; 67f46b5a66SChristoph Hellwig int err; 68f46b5a66SChristoph Hellwig u64 objectid; 69f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 703de4586cSChris Mason u64 index = 0; 71f46b5a66SChristoph Hellwig unsigned long nr = 1; 72f46b5a66SChristoph Hellwig 736a63209fSJosef Bacik ret = btrfs_check_metadata_free_space(root); 74f46b5a66SChristoph Hellwig if (ret) 75f46b5a66SChristoph Hellwig goto fail_commit; 76f46b5a66SChristoph Hellwig 77f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 78f46b5a66SChristoph Hellwig BUG_ON(!trans); 79f46b5a66SChristoph Hellwig 80f46b5a66SChristoph Hellwig ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, 81f46b5a66SChristoph Hellwig 0, &objectid); 82f46b5a66SChristoph Hellwig if (ret) 83f46b5a66SChristoph Hellwig goto fail; 84f46b5a66SChristoph Hellwig 8531840ae1SZheng Yan leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, 8631840ae1SZheng Yan objectid, trans->transid, 0, 0, 0); 878e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 888e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 898e8a1e31SJosef Bacik goto fail; 908e8a1e31SJosef Bacik } 91f46b5a66SChristoph Hellwig 92f46b5a66SChristoph Hellwig btrfs_set_header_nritems(leaf, 0); 93f46b5a66SChristoph Hellwig btrfs_set_header_level(leaf, 0); 94f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 95f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 96f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 97f46b5a66SChristoph Hellwig 98f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 99f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 100f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 101f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 102f46b5a66SChristoph Hellwig 103f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 104f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 105f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 106f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 107f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 108a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 109f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 110f46b5a66SChristoph Hellwig 111f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 11284234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 113f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 114f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 115f46b5a66SChristoph Hellwig btrfs_set_root_used(&root_item, 0); 11680ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 117f46b5a66SChristoph Hellwig 118f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 119f46b5a66SChristoph Hellwig root_item.drop_level = 0; 120f46b5a66SChristoph Hellwig 121925baeddSChris Mason btrfs_tree_unlock(leaf); 122f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 123f46b5a66SChristoph Hellwig leaf = NULL; 124f46b5a66SChristoph Hellwig 125f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 126f46b5a66SChristoph Hellwig 127f46b5a66SChristoph Hellwig key.objectid = objectid; 128f46b5a66SChristoph Hellwig key.offset = 1; 129f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 130f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 131f46b5a66SChristoph Hellwig &root_item); 132f46b5a66SChristoph Hellwig if (ret) 133f46b5a66SChristoph Hellwig goto fail; 134f46b5a66SChristoph Hellwig 135f46b5a66SChristoph Hellwig /* 136f46b5a66SChristoph Hellwig * insert the directory item 137f46b5a66SChristoph Hellwig */ 138f46b5a66SChristoph Hellwig key.offset = (u64)-1; 1393de4586cSChris Mason dir = dentry->d_parent->d_inode; 1403de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 1413de4586cSChris Mason BUG_ON(ret); 1423de4586cSChris Mason 1433de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 144f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 1453de4586cSChris Mason BTRFS_FT_DIR, index); 146f46b5a66SChristoph Hellwig if (ret) 147f46b5a66SChristoph Hellwig goto fail; 1480660b5afSChris Mason 14952c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 15052c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 15152c26179SYan Zheng BUG_ON(ret); 15252c26179SYan Zheng 1530660b5afSChris Mason /* add the backref first */ 1540660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 1550660b5afSChris Mason objectid, BTRFS_ROOT_BACKREF_KEY, 1560660b5afSChris Mason root->root_key.objectid, 1570660b5afSChris Mason dir->i_ino, index, name, namelen); 1580660b5afSChris Mason 1590660b5afSChris Mason BUG_ON(ret); 1600660b5afSChris Mason 1610660b5afSChris Mason /* now add the forward ref */ 1620660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 1630660b5afSChris Mason root->root_key.objectid, BTRFS_ROOT_REF_KEY, 1640660b5afSChris Mason objectid, 1650660b5afSChris Mason dir->i_ino, index, name, namelen); 1660660b5afSChris Mason 1670660b5afSChris Mason BUG_ON(ret); 1680660b5afSChris Mason 169f46b5a66SChristoph Hellwig ret = btrfs_commit_transaction(trans, root); 170f46b5a66SChristoph Hellwig if (ret) 171f46b5a66SChristoph Hellwig goto fail_commit; 172f46b5a66SChristoph Hellwig 1733de4586cSChris Mason new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 174f46b5a66SChristoph Hellwig BUG_ON(!new_root); 175f46b5a66SChristoph Hellwig 176f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(new_root, 1); 177f46b5a66SChristoph Hellwig BUG_ON(!trans); 178f46b5a66SChristoph Hellwig 179d2fb3437SYan Zheng ret = btrfs_create_subvol_root(trans, new_root, dentry, new_dirid, 180f46b5a66SChristoph Hellwig BTRFS_I(dir)->block_group); 181f46b5a66SChristoph Hellwig if (ret) 182f46b5a66SChristoph Hellwig goto fail; 183f46b5a66SChristoph Hellwig 184f46b5a66SChristoph Hellwig fail: 185f46b5a66SChristoph Hellwig nr = trans->blocks_used; 186f46b5a66SChristoph Hellwig err = btrfs_commit_transaction(trans, new_root); 187f46b5a66SChristoph Hellwig if (err && !ret) 188f46b5a66SChristoph Hellwig ret = err; 189f46b5a66SChristoph Hellwig fail_commit: 190f46b5a66SChristoph Hellwig btrfs_btree_balance_dirty(root, nr); 191f46b5a66SChristoph Hellwig return ret; 192f46b5a66SChristoph Hellwig } 193f46b5a66SChristoph Hellwig 1943de4586cSChris Mason static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 1953de4586cSChris Mason char *name, int namelen) 196f46b5a66SChristoph Hellwig { 197f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 198f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1993de4586cSChris Mason int ret = 0; 200f46b5a66SChristoph Hellwig int err; 201f46b5a66SChristoph Hellwig unsigned long nr = 0; 202f46b5a66SChristoph Hellwig 203f46b5a66SChristoph Hellwig if (!root->ref_cows) 204f46b5a66SChristoph Hellwig return -EINVAL; 205f46b5a66SChristoph Hellwig 2066a63209fSJosef Bacik ret = btrfs_check_metadata_free_space(root); 207f46b5a66SChristoph Hellwig if (ret) 208f46b5a66SChristoph Hellwig goto fail_unlock; 209f46b5a66SChristoph Hellwig 2103de4586cSChris Mason pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 211f46b5a66SChristoph Hellwig if (!pending_snapshot) { 212f46b5a66SChristoph Hellwig ret = -ENOMEM; 213f46b5a66SChristoph Hellwig goto fail_unlock; 214f46b5a66SChristoph Hellwig } 215f46b5a66SChristoph Hellwig pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); 216f46b5a66SChristoph Hellwig if (!pending_snapshot->name) { 217f46b5a66SChristoph Hellwig ret = -ENOMEM; 218f46b5a66SChristoph Hellwig kfree(pending_snapshot); 219f46b5a66SChristoph Hellwig goto fail_unlock; 220f46b5a66SChristoph Hellwig } 221f46b5a66SChristoph Hellwig memcpy(pending_snapshot->name, name, namelen); 222f46b5a66SChristoph Hellwig pending_snapshot->name[namelen] = '\0'; 2233de4586cSChris Mason pending_snapshot->dentry = dentry; 224f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 225f46b5a66SChristoph Hellwig BUG_ON(!trans); 226f46b5a66SChristoph Hellwig pending_snapshot->root = root; 227f46b5a66SChristoph Hellwig list_add(&pending_snapshot->list, 228f46b5a66SChristoph Hellwig &trans->transaction->pending_snapshots); 229f46b5a66SChristoph Hellwig err = btrfs_commit_transaction(trans, root); 230f46b5a66SChristoph Hellwig 231f46b5a66SChristoph Hellwig fail_unlock: 232f46b5a66SChristoph Hellwig btrfs_btree_balance_dirty(root, nr); 233f46b5a66SChristoph Hellwig return ret; 234f46b5a66SChristoph Hellwig } 235f46b5a66SChristoph Hellwig 236cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 237cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 238cb8e7090SChristoph Hellwig { 239cb8e7090SChristoph Hellwig if (child->d_inode) 240cb8e7090SChristoph Hellwig return -EEXIST; 241cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 242cb8e7090SChristoph Hellwig return -ENOENT; 243cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 244cb8e7090SChristoph Hellwig } 245cb8e7090SChristoph Hellwig 246cb8e7090SChristoph Hellwig /* 247cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 248cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 249cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 250cb8e7090SChristoph Hellwig */ 251cb8e7090SChristoph Hellwig static noinline int btrfs_mksubvol(struct path *parent, char *name, 2523de4586cSChris Mason int mode, int namelen, 2533de4586cSChris Mason struct btrfs_root *snap_src) 254cb8e7090SChristoph Hellwig { 255cb8e7090SChristoph Hellwig struct dentry *dentry; 256cb8e7090SChristoph Hellwig int error; 257cb8e7090SChristoph Hellwig 258cb8e7090SChristoph Hellwig mutex_lock_nested(&parent->dentry->d_inode->i_mutex, I_MUTEX_PARENT); 259cb8e7090SChristoph Hellwig 260cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 261cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 262cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 263cb8e7090SChristoph Hellwig goto out_unlock; 264cb8e7090SChristoph Hellwig 265cb8e7090SChristoph Hellwig error = -EEXIST; 266cb8e7090SChristoph Hellwig if (dentry->d_inode) 267cb8e7090SChristoph Hellwig goto out_dput; 268cb8e7090SChristoph Hellwig 269cb8e7090SChristoph Hellwig if (!IS_POSIXACL(parent->dentry->d_inode)) 270ce3b0f8dSAl Viro mode &= ~current_umask(); 2713de4586cSChris Mason 272cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 273cb8e7090SChristoph Hellwig if (error) 274cb8e7090SChristoph Hellwig goto out_dput; 275cb8e7090SChristoph Hellwig 276cb8e7090SChristoph Hellwig error = btrfs_may_create(parent->dentry->d_inode, dentry); 277cb8e7090SChristoph Hellwig if (error) 278cb8e7090SChristoph Hellwig goto out_drop_write; 279cb8e7090SChristoph Hellwig 280cb8e7090SChristoph Hellwig /* 281cb8e7090SChristoph Hellwig * Actually perform the low-level subvolume creation after all 282cb8e7090SChristoph Hellwig * this VFS fuzz. 283cb8e7090SChristoph Hellwig * 284cb8e7090SChristoph Hellwig * Eventually we want to pass in an inode under which we create this 285cb8e7090SChristoph Hellwig * subvolume, but for now all are under the filesystem root. 286cb8e7090SChristoph Hellwig * 287cb8e7090SChristoph Hellwig * Also we should pass on the mode eventually to allow creating new 288cb8e7090SChristoph Hellwig * subvolume with specific mode bits. 289cb8e7090SChristoph Hellwig */ 2903de4586cSChris Mason if (snap_src) { 291ea9e8b11SChris Mason struct dentry *dir = dentry->d_parent; 292ea9e8b11SChris Mason struct dentry *test = dir->d_parent; 293ea9e8b11SChris Mason struct btrfs_path *path = btrfs_alloc_path(); 294ea9e8b11SChris Mason int ret; 295ea9e8b11SChris Mason u64 test_oid; 296ea9e8b11SChris Mason u64 parent_oid = BTRFS_I(dir->d_inode)->root->root_key.objectid; 297ea9e8b11SChris Mason 298ea9e8b11SChris Mason test_oid = snap_src->root_key.objectid; 299ea9e8b11SChris Mason 300ea9e8b11SChris Mason ret = btrfs_find_root_ref(snap_src->fs_info->tree_root, 301ea9e8b11SChris Mason path, parent_oid, test_oid); 302ea9e8b11SChris Mason if (ret == 0) 303ea9e8b11SChris Mason goto create; 304ea9e8b11SChris Mason btrfs_release_path(snap_src->fs_info->tree_root, path); 305ea9e8b11SChris Mason 306ea9e8b11SChris Mason /* we need to make sure we aren't creating a directory loop 307ea9e8b11SChris Mason * by taking a snapshot of something that has our current 308ea9e8b11SChris Mason * subvol in its directory tree. So, this loops through 309ea9e8b11SChris Mason * the dentries and checks the forward refs for each subvolume 310ea9e8b11SChris Mason * to see if is references the subvolume where we are 311ea9e8b11SChris Mason * placing this new snapshot. 312ea9e8b11SChris Mason */ 313ea9e8b11SChris Mason while (1) { 314ea9e8b11SChris Mason if (!test || 315ea9e8b11SChris Mason dir == snap_src->fs_info->sb->s_root || 316ea9e8b11SChris Mason test == snap_src->fs_info->sb->s_root || 317ea9e8b11SChris Mason test->d_inode->i_sb != snap_src->fs_info->sb) { 318ea9e8b11SChris Mason break; 319ea9e8b11SChris Mason } 320ea9e8b11SChris Mason if (S_ISLNK(test->d_inode->i_mode)) { 321d397712bSChris Mason printk(KERN_INFO "Btrfs symlink in snapshot " 322d397712bSChris Mason "path, failed\n"); 323ea9e8b11SChris Mason error = -EMLINK; 324ea9e8b11SChris Mason btrfs_free_path(path); 325ea9e8b11SChris Mason goto out_drop_write; 326ea9e8b11SChris Mason } 327ea9e8b11SChris Mason test_oid = 328ea9e8b11SChris Mason BTRFS_I(test->d_inode)->root->root_key.objectid; 329ea9e8b11SChris Mason ret = btrfs_find_root_ref(snap_src->fs_info->tree_root, 330ea9e8b11SChris Mason path, test_oid, parent_oid); 331ea9e8b11SChris Mason if (ret == 0) { 332d397712bSChris Mason printk(KERN_INFO "Btrfs snapshot creation " 333d397712bSChris Mason "failed, looping\n"); 334ea9e8b11SChris Mason error = -EMLINK; 335ea9e8b11SChris Mason btrfs_free_path(path); 336ea9e8b11SChris Mason goto out_drop_write; 337ea9e8b11SChris Mason } 338ea9e8b11SChris Mason btrfs_release_path(snap_src->fs_info->tree_root, path); 339ea9e8b11SChris Mason test = test->d_parent; 340ea9e8b11SChris Mason } 341ea9e8b11SChris Mason create: 342ea9e8b11SChris Mason btrfs_free_path(path); 3433de4586cSChris Mason error = create_snapshot(snap_src, dentry, name, namelen); 3443de4586cSChris Mason } else { 3453de4586cSChris Mason error = create_subvol(BTRFS_I(parent->dentry->d_inode)->root, 3463de4586cSChris Mason dentry, name, namelen); 3473de4586cSChris Mason } 348cb8e7090SChristoph Hellwig if (error) 349cb8e7090SChristoph Hellwig goto out_drop_write; 350cb8e7090SChristoph Hellwig 351cb8e7090SChristoph Hellwig fsnotify_mkdir(parent->dentry->d_inode, dentry); 352cb8e7090SChristoph Hellwig out_drop_write: 353cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 354cb8e7090SChristoph Hellwig out_dput: 355cb8e7090SChristoph Hellwig dput(dentry); 356cb8e7090SChristoph Hellwig out_unlock: 357cb8e7090SChristoph Hellwig mutex_unlock(&parent->dentry->d_inode->i_mutex); 358cb8e7090SChristoph Hellwig return error; 359cb8e7090SChristoph Hellwig } 360cb8e7090SChristoph Hellwig 361cb8e7090SChristoph Hellwig 362b2950863SChristoph Hellwig static int btrfs_defrag_file(struct file *file) 363f46b5a66SChristoph Hellwig { 364f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 365f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 366f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 3673eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 368f46b5a66SChristoph Hellwig struct page *page; 369f46b5a66SChristoph Hellwig unsigned long last_index; 370f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 371f46b5a66SChristoph Hellwig unsigned long total_read = 0; 372f46b5a66SChristoph Hellwig u64 page_start; 373f46b5a66SChristoph Hellwig u64 page_end; 374f46b5a66SChristoph Hellwig unsigned long i; 375f46b5a66SChristoph Hellwig int ret; 376f46b5a66SChristoph Hellwig 3776a63209fSJosef Bacik ret = btrfs_check_data_free_space(root, inode, inode->i_size); 378f46b5a66SChristoph Hellwig if (ret) 379f46b5a66SChristoph Hellwig return -ENOSPC; 380f46b5a66SChristoph Hellwig 381f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 382f46b5a66SChristoph Hellwig last_index = inode->i_size >> PAGE_CACHE_SHIFT; 383f46b5a66SChristoph Hellwig for (i = 0; i <= last_index; i++) { 384f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 385f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 386f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 387f46b5a66SChristoph Hellwig } 388f46b5a66SChristoph Hellwig total_read++; 3893eaa2885SChris Mason again: 390f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 391f46b5a66SChristoph Hellwig if (!page) 392f46b5a66SChristoph Hellwig goto out_unlock; 393f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 394f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 395f46b5a66SChristoph Hellwig lock_page(page); 396f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 397f46b5a66SChristoph Hellwig unlock_page(page); 398f46b5a66SChristoph Hellwig page_cache_release(page); 399f46b5a66SChristoph Hellwig goto out_unlock; 400f46b5a66SChristoph Hellwig } 401f46b5a66SChristoph Hellwig } 402f46b5a66SChristoph Hellwig 403f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 404f46b5a66SChristoph Hellwig 405f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 406f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 407f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 4083eaa2885SChris Mason 4093eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 4103eaa2885SChris Mason if (ordered) { 4113eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 4123eaa2885SChris Mason unlock_page(page); 4133eaa2885SChris Mason page_cache_release(page); 4143eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 4153eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 4163eaa2885SChris Mason goto again; 4173eaa2885SChris Mason } 4183eaa2885SChris Mason set_page_extent_mapped(page); 4193eaa2885SChris Mason 420f87f057bSChris Mason /* 421f87f057bSChris Mason * this makes sure page_mkwrite is called on the 422f87f057bSChris Mason * page if it is dirtied again later 423f87f057bSChris Mason */ 424f87f057bSChris Mason clear_page_dirty_for_io(page); 425f87f057bSChris Mason 426ea8c2819SChris Mason btrfs_set_extent_delalloc(inode, page_start, page_end); 427f46b5a66SChristoph Hellwig 428f46b5a66SChristoph Hellwig unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 429f46b5a66SChristoph Hellwig set_page_dirty(page); 430f46b5a66SChristoph Hellwig unlock_page(page); 431f46b5a66SChristoph Hellwig page_cache_release(page); 432f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 433f46b5a66SChristoph Hellwig } 434f46b5a66SChristoph Hellwig 435f46b5a66SChristoph Hellwig out_unlock: 436f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 437f46b5a66SChristoph Hellwig return 0; 438f46b5a66SChristoph Hellwig } 439f46b5a66SChristoph Hellwig 440f46b5a66SChristoph Hellwig /* 441f46b5a66SChristoph Hellwig * Called inside transaction, so use GFP_NOFS 442f46b5a66SChristoph Hellwig */ 443f46b5a66SChristoph Hellwig 444f46b5a66SChristoph Hellwig static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) 445f46b5a66SChristoph Hellwig { 446f46b5a66SChristoph Hellwig u64 new_size; 447f46b5a66SChristoph Hellwig u64 old_size; 448f46b5a66SChristoph Hellwig u64 devid = 1; 449f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 450f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 451f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 452f46b5a66SChristoph Hellwig char *sizestr; 453f46b5a66SChristoph Hellwig char *devstr = NULL; 454f46b5a66SChristoph Hellwig int ret = 0; 455f46b5a66SChristoph Hellwig int namelen; 456f46b5a66SChristoph Hellwig int mod = 0; 457f46b5a66SChristoph Hellwig 458c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 459c146afadSYan Zheng return -EROFS; 460c146afadSYan Zheng 461e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 462e441d54dSChris Mason return -EPERM; 463e441d54dSChris Mason 464*dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 465*dae7b665SLi Zefan if (IS_ERR(vol_args)) 466*dae7b665SLi Zefan return PTR_ERR(vol_args); 4675516e595SMark Fasheh 4685516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 469f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 470f46b5a66SChristoph Hellwig 4717d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 472f46b5a66SChristoph Hellwig sizestr = vol_args->name; 473f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 474f46b5a66SChristoph Hellwig if (devstr) { 475f46b5a66SChristoph Hellwig char *end; 476f46b5a66SChristoph Hellwig sizestr = devstr + 1; 477f46b5a66SChristoph Hellwig *devstr = '\0'; 478f46b5a66SChristoph Hellwig devstr = vol_args->name; 479f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 480f46b5a66SChristoph Hellwig printk(KERN_INFO "resizing devid %llu\n", devid); 481f46b5a66SChristoph Hellwig } 4822b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 483f46b5a66SChristoph Hellwig if (!device) { 484f46b5a66SChristoph Hellwig printk(KERN_INFO "resizer unable to find device %llu\n", devid); 485f46b5a66SChristoph Hellwig ret = -EINVAL; 486f46b5a66SChristoph Hellwig goto out_unlock; 487f46b5a66SChristoph Hellwig } 488f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 489f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 490f46b5a66SChristoph Hellwig else { 491f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 492f46b5a66SChristoph Hellwig mod = -1; 493f46b5a66SChristoph Hellwig sizestr++; 494f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 495f46b5a66SChristoph Hellwig mod = 1; 496f46b5a66SChristoph Hellwig sizestr++; 497f46b5a66SChristoph Hellwig } 498f46b5a66SChristoph Hellwig new_size = btrfs_parse_size(sizestr); 499f46b5a66SChristoph Hellwig if (new_size == 0) { 500f46b5a66SChristoph Hellwig ret = -EINVAL; 501f46b5a66SChristoph Hellwig goto out_unlock; 502f46b5a66SChristoph Hellwig } 503f46b5a66SChristoph Hellwig } 504f46b5a66SChristoph Hellwig 505f46b5a66SChristoph Hellwig old_size = device->total_bytes; 506f46b5a66SChristoph Hellwig 507f46b5a66SChristoph Hellwig if (mod < 0) { 508f46b5a66SChristoph Hellwig if (new_size > old_size) { 509f46b5a66SChristoph Hellwig ret = -EINVAL; 510f46b5a66SChristoph Hellwig goto out_unlock; 511f46b5a66SChristoph Hellwig } 512f46b5a66SChristoph Hellwig new_size = old_size - new_size; 513f46b5a66SChristoph Hellwig } else if (mod > 0) { 514f46b5a66SChristoph Hellwig new_size = old_size + new_size; 515f46b5a66SChristoph Hellwig } 516f46b5a66SChristoph Hellwig 517f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 518f46b5a66SChristoph Hellwig ret = -EINVAL; 519f46b5a66SChristoph Hellwig goto out_unlock; 520f46b5a66SChristoph Hellwig } 521f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 522f46b5a66SChristoph Hellwig ret = -EFBIG; 523f46b5a66SChristoph Hellwig goto out_unlock; 524f46b5a66SChristoph Hellwig } 525f46b5a66SChristoph Hellwig 526f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 527f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 528f46b5a66SChristoph Hellwig 529f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 530f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 531f46b5a66SChristoph Hellwig 532f46b5a66SChristoph Hellwig if (new_size > old_size) { 533f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 534f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 535f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 536f46b5a66SChristoph Hellwig } else { 537f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 538f46b5a66SChristoph Hellwig } 539f46b5a66SChristoph Hellwig 540f46b5a66SChristoph Hellwig out_unlock: 5417d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 542f46b5a66SChristoph Hellwig kfree(vol_args); 543f46b5a66SChristoph Hellwig return ret; 544f46b5a66SChristoph Hellwig } 545f46b5a66SChristoph Hellwig 546cb8e7090SChristoph Hellwig static noinline int btrfs_ioctl_snap_create(struct file *file, 5473de4586cSChris Mason void __user *arg, int subvol) 548f46b5a66SChristoph Hellwig { 549cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 550f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 551f46b5a66SChristoph Hellwig struct btrfs_dir_item *di; 552f46b5a66SChristoph Hellwig struct btrfs_path *path; 5533de4586cSChris Mason struct file *src_file; 554f46b5a66SChristoph Hellwig u64 root_dirid; 555f46b5a66SChristoph Hellwig int namelen; 5563de4586cSChris Mason int ret = 0; 557f46b5a66SChristoph Hellwig 558c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 559c146afadSYan Zheng return -EROFS; 560c146afadSYan Zheng 561*dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 562*dae7b665SLi Zefan if (IS_ERR(vol_args)) 563*dae7b665SLi Zefan return PTR_ERR(vol_args); 564f46b5a66SChristoph Hellwig 5655516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 566f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 567f46b5a66SChristoph Hellwig if (strchr(vol_args->name, '/')) { 568f46b5a66SChristoph Hellwig ret = -EINVAL; 569f46b5a66SChristoph Hellwig goto out; 570f46b5a66SChristoph Hellwig } 571f46b5a66SChristoph Hellwig 572f46b5a66SChristoph Hellwig path = btrfs_alloc_path(); 573f46b5a66SChristoph Hellwig if (!path) { 574f46b5a66SChristoph Hellwig ret = -ENOMEM; 575f46b5a66SChristoph Hellwig goto out; 576f46b5a66SChristoph Hellwig } 577f46b5a66SChristoph Hellwig 578f46b5a66SChristoph Hellwig root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, 579f46b5a66SChristoph Hellwig di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, 580f46b5a66SChristoph Hellwig path, root_dirid, 581f46b5a66SChristoph Hellwig vol_args->name, namelen, 0); 582f46b5a66SChristoph Hellwig btrfs_free_path(path); 583f46b5a66SChristoph Hellwig 584f46b5a66SChristoph Hellwig if (di && !IS_ERR(di)) { 585f46b5a66SChristoph Hellwig ret = -EEXIST; 586f46b5a66SChristoph Hellwig goto out; 587f46b5a66SChristoph Hellwig } 588f46b5a66SChristoph Hellwig 589f46b5a66SChristoph Hellwig if (IS_ERR(di)) { 590f46b5a66SChristoph Hellwig ret = PTR_ERR(di); 591f46b5a66SChristoph Hellwig goto out; 592f46b5a66SChristoph Hellwig } 593f46b5a66SChristoph Hellwig 5943de4586cSChris Mason if (subvol) { 595cb8e7090SChristoph Hellwig ret = btrfs_mksubvol(&file->f_path, vol_args->name, 596cb8e7090SChristoph Hellwig file->f_path.dentry->d_inode->i_mode, 5973de4586cSChris Mason namelen, NULL); 598cb8e7090SChristoph Hellwig } else { 5993de4586cSChris Mason struct inode *src_inode; 6003de4586cSChris Mason src_file = fget(vol_args->fd); 6013de4586cSChris Mason if (!src_file) { 6023de4586cSChris Mason ret = -EINVAL; 6033de4586cSChris Mason goto out; 6043de4586cSChris Mason } 6053de4586cSChris Mason 6063de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 6073de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 608d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 609d397712bSChris Mason "another FS\n"); 6103de4586cSChris Mason ret = -EINVAL; 6113de4586cSChris Mason fput(src_file); 6123de4586cSChris Mason goto out; 6133de4586cSChris Mason } 6143de4586cSChris Mason ret = btrfs_mksubvol(&file->f_path, vol_args->name, 6153de4586cSChris Mason file->f_path.dentry->d_inode->i_mode, 6163de4586cSChris Mason namelen, BTRFS_I(src_inode)->root); 6173de4586cSChris Mason fput(src_file); 618cb8e7090SChristoph Hellwig } 619cb8e7090SChristoph Hellwig 620f46b5a66SChristoph Hellwig out: 621f46b5a66SChristoph Hellwig kfree(vol_args); 622f46b5a66SChristoph Hellwig return ret; 623f46b5a66SChristoph Hellwig } 624f46b5a66SChristoph Hellwig 625f46b5a66SChristoph Hellwig static int btrfs_ioctl_defrag(struct file *file) 626f46b5a66SChristoph Hellwig { 627f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 628f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 629c146afadSYan Zheng int ret; 630c146afadSYan Zheng 631c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 632c146afadSYan Zheng if (ret) 633c146afadSYan Zheng return ret; 634f46b5a66SChristoph Hellwig 635f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 636f46b5a66SChristoph Hellwig case S_IFDIR: 637e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 638e441d54dSChris Mason ret = -EPERM; 639e441d54dSChris Mason goto out; 640e441d54dSChris Mason } 641f46b5a66SChristoph Hellwig btrfs_defrag_root(root, 0); 642f46b5a66SChristoph Hellwig btrfs_defrag_root(root->fs_info->extent_root, 0); 643f46b5a66SChristoph Hellwig break; 644f46b5a66SChristoph Hellwig case S_IFREG: 645e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 646e441d54dSChris Mason ret = -EINVAL; 647e441d54dSChris Mason goto out; 648e441d54dSChris Mason } 649f46b5a66SChristoph Hellwig btrfs_defrag_file(file); 650f46b5a66SChristoph Hellwig break; 651f46b5a66SChristoph Hellwig } 652e441d54dSChris Mason out: 653ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 654e441d54dSChris Mason return ret; 655f46b5a66SChristoph Hellwig } 656f46b5a66SChristoph Hellwig 657b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 658f46b5a66SChristoph Hellwig { 659f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 660f46b5a66SChristoph Hellwig int ret; 661f46b5a66SChristoph Hellwig 662e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 663e441d54dSChris Mason return -EPERM; 664e441d54dSChris Mason 665*dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 666*dae7b665SLi Zefan if (IS_ERR(vol_args)) 667*dae7b665SLi Zefan return PTR_ERR(vol_args); 668f46b5a66SChristoph Hellwig 6695516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 670f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 671f46b5a66SChristoph Hellwig 672f46b5a66SChristoph Hellwig kfree(vol_args); 673f46b5a66SChristoph Hellwig return ret; 674f46b5a66SChristoph Hellwig } 675f46b5a66SChristoph Hellwig 676b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 677f46b5a66SChristoph Hellwig { 678f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 679f46b5a66SChristoph Hellwig int ret; 680f46b5a66SChristoph Hellwig 681e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 682e441d54dSChris Mason return -EPERM; 683e441d54dSChris Mason 684c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 685c146afadSYan Zheng return -EROFS; 686c146afadSYan Zheng 687*dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 688*dae7b665SLi Zefan if (IS_ERR(vol_args)) 689*dae7b665SLi Zefan return PTR_ERR(vol_args); 690f46b5a66SChristoph Hellwig 6915516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 692f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 693f46b5a66SChristoph Hellwig 694f46b5a66SChristoph Hellwig kfree(vol_args); 695f46b5a66SChristoph Hellwig return ret; 696f46b5a66SChristoph Hellwig } 697f46b5a66SChristoph Hellwig 698b2950863SChristoph Hellwig static long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 699b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 700f46b5a66SChristoph Hellwig { 701f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 702f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 703f46b5a66SChristoph Hellwig struct file *src_file; 704f46b5a66SChristoph Hellwig struct inode *src; 705f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 706f46b5a66SChristoph Hellwig struct btrfs_path *path; 707f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 708ae01a0abSYan Zheng char *buf; 709ae01a0abSYan Zheng struct btrfs_key key; 710f46b5a66SChristoph Hellwig u32 nritems; 711f46b5a66SChristoph Hellwig int slot; 712ae01a0abSYan Zheng int ret; 713c5c9cd4dSSage Weil u64 len = olen; 714c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 715c5c9cd4dSSage Weil u64 hint_byte; 716d20f7043SChris Mason 717c5c9cd4dSSage Weil /* 718c5c9cd4dSSage Weil * TODO: 719c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 720c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 721c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 722c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 723c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 724c5c9cd4dSSage Weil * they don't overlap)? 725c5c9cd4dSSage Weil */ 726c5c9cd4dSSage Weil 727e441d54dSChris Mason /* the destination must be opened for writing */ 728e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) 729e441d54dSChris Mason return -EINVAL; 730e441d54dSChris Mason 731c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 732c146afadSYan Zheng if (ret) 733c146afadSYan Zheng return ret; 734c146afadSYan Zheng 735c5c9cd4dSSage Weil src_file = fget(srcfd); 736ab67b7c1SYan Zheng if (!src_file) { 737ab67b7c1SYan Zheng ret = -EBADF; 738ab67b7c1SYan Zheng goto out_drop_write; 739ab67b7c1SYan Zheng } 740f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 741f46b5a66SChristoph Hellwig 742c5c9cd4dSSage Weil ret = -EINVAL; 743c5c9cd4dSSage Weil if (src == inode) 744c5c9cd4dSSage Weil goto out_fput; 745c5c9cd4dSSage Weil 746ae01a0abSYan Zheng ret = -EISDIR; 747ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 748f46b5a66SChristoph Hellwig goto out_fput; 749f46b5a66SChristoph Hellwig 750ae01a0abSYan Zheng ret = -EXDEV; 751ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 752ae01a0abSYan Zheng goto out_fput; 753ae01a0abSYan Zheng 754ae01a0abSYan Zheng ret = -ENOMEM; 755ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 756ae01a0abSYan Zheng if (!buf) 757ae01a0abSYan Zheng goto out_fput; 758ae01a0abSYan Zheng 759ae01a0abSYan Zheng path = btrfs_alloc_path(); 760ae01a0abSYan Zheng if (!path) { 761ae01a0abSYan Zheng vfree(buf); 762ae01a0abSYan Zheng goto out_fput; 763ae01a0abSYan Zheng } 764ae01a0abSYan Zheng path->reada = 2; 765ae01a0abSYan Zheng 766f46b5a66SChristoph Hellwig if (inode < src) { 767f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 768f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 769f46b5a66SChristoph Hellwig } else { 770f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 771f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 772f46b5a66SChristoph Hellwig } 773f46b5a66SChristoph Hellwig 774c5c9cd4dSSage Weil /* determine range to clone */ 775c5c9cd4dSSage Weil ret = -EINVAL; 776c5c9cd4dSSage Weil if (off >= src->i_size || off + len > src->i_size) 777f46b5a66SChristoph Hellwig goto out_unlock; 778c5c9cd4dSSage Weil if (len == 0) 779c5c9cd4dSSage Weil olen = len = src->i_size - off; 780c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 781c5c9cd4dSSage Weil if (off + len == src->i_size) 782c5c9cd4dSSage Weil len = ((src->i_size + bs-1) & ~(bs-1)) 783c5c9cd4dSSage Weil - off; 784c5c9cd4dSSage Weil 785c5c9cd4dSSage Weil /* verify the end result is block aligned */ 786c5c9cd4dSSage Weil if ((off & (bs-1)) || 787c5c9cd4dSSage Weil ((off + len) & (bs-1))) 788c5c9cd4dSSage Weil goto out_unlock; 789c5c9cd4dSSage Weil 790f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 791f46b5a66SChristoph Hellwig another, and lock file content */ 792f46b5a66SChristoph Hellwig while (1) { 79331840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 794c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 795c5c9cd4dSSage Weil ordered = btrfs_lookup_first_ordered_extent(inode, off+len); 796ae01a0abSYan Zheng if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) 797f46b5a66SChristoph Hellwig break; 798c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 799ae01a0abSYan Zheng if (ordered) 800ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 801c5c9cd4dSSage Weil btrfs_wait_ordered_range(src, off, off+len); 802f46b5a66SChristoph Hellwig } 803f46b5a66SChristoph Hellwig 804ae01a0abSYan Zheng trans = btrfs_start_transaction(root, 1); 805ae01a0abSYan Zheng BUG_ON(!trans); 806ae01a0abSYan Zheng 807c5c9cd4dSSage Weil /* punch hole in destination first */ 808c5c9cd4dSSage Weil btrfs_drop_extents(trans, root, inode, off, off+len, 0, &hint_byte); 809c5c9cd4dSSage Weil 810c5c9cd4dSSage Weil /* clone data */ 811f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 812ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 813ae01a0abSYan Zheng key.offset = 0; 814f46b5a66SChristoph Hellwig 815f46b5a66SChristoph Hellwig while (1) { 816f46b5a66SChristoph Hellwig /* 817f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 818f46b5a66SChristoph Hellwig * tree. 819f46b5a66SChristoph Hellwig */ 820f46b5a66SChristoph Hellwig ret = btrfs_search_slot(trans, root, &key, path, 0, 0); 821f46b5a66SChristoph Hellwig if (ret < 0) 822f46b5a66SChristoph Hellwig goto out; 823f46b5a66SChristoph Hellwig 824ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 825ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 826f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 827f46b5a66SChristoph Hellwig if (ret < 0) 828f46b5a66SChristoph Hellwig goto out; 829f46b5a66SChristoph Hellwig if (ret > 0) 830f46b5a66SChristoph Hellwig break; 831ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 832f46b5a66SChristoph Hellwig } 833f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 834f46b5a66SChristoph Hellwig slot = path->slots[0]; 835f46b5a66SChristoph Hellwig 836ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 837d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 838f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 839f46b5a66SChristoph Hellwig break; 840f46b5a66SChristoph Hellwig 841c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 842c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 843c5c9cd4dSSage Weil int type; 84431840ae1SZheng Yan u32 size; 84531840ae1SZheng Yan struct btrfs_key new_key; 846c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 847c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 848c5c9cd4dSSage Weil u8 comp; 84931840ae1SZheng Yan 85031840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 85131840ae1SZheng Yan read_extent_buffer(leaf, buf, 85231840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 85331840ae1SZheng Yan size); 854c5c9cd4dSSage Weil 855c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 856c5c9cd4dSSage Weil struct btrfs_file_extent_item); 857c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 858c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 859c5c9cd4dSSage Weil if (type == BTRFS_FILE_EXTENT_REG) { 860d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 861d397712bSChris Mason extent); 862d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 863d397712bSChris Mason extent); 864c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 865d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 866d397712bSChris Mason extent); 867c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 868c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 869c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 870c5c9cd4dSSage Weil extent); 871c5c9cd4dSSage Weil } 87231840ae1SZheng Yan btrfs_release_path(root, path); 87331840ae1SZheng Yan 874c5c9cd4dSSage Weil if (key.offset + datal < off || 875c5c9cd4dSSage Weil key.offset >= off+len) 876c5c9cd4dSSage Weil goto next; 877c5c9cd4dSSage Weil 87831840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 87931840ae1SZheng Yan new_key.objectid = inode->i_ino; 880c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 881c5c9cd4dSSage Weil 882c5c9cd4dSSage Weil if (type == BTRFS_FILE_EXTENT_REG) { 88331840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 88431840ae1SZheng Yan &new_key, size); 88531840ae1SZheng Yan if (ret) 88631840ae1SZheng Yan goto out; 88731840ae1SZheng Yan 88831840ae1SZheng Yan leaf = path->nodes[0]; 88931840ae1SZheng Yan slot = path->slots[0]; 89031840ae1SZheng Yan write_extent_buffer(leaf, buf, 89131840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 89231840ae1SZheng Yan size); 893ae01a0abSYan Zheng 894f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 895f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 896c5c9cd4dSSage Weil 897c5c9cd4dSSage Weil if (off > key.offset) { 898c5c9cd4dSSage Weil datao += off - key.offset; 899c5c9cd4dSSage Weil datal -= off - key.offset; 900c5c9cd4dSSage Weil } 901c5c9cd4dSSage Weil if (key.offset + datao + datal + key.offset > 902c5c9cd4dSSage Weil off + len) 903c5c9cd4dSSage Weil datal = off + len - key.offset - datao; 904c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 905c5c9cd4dSSage Weil if (!disko) 906c5c9cd4dSSage Weil datao = 0; 907c5c9cd4dSSage Weil 908c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 909c5c9cd4dSSage Weil datao); 910c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 911c5c9cd4dSSage Weil datal); 912c5c9cd4dSSage Weil if (disko) { 913c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 914ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 915c5c9cd4dSSage Weil disko, diskl, leaf->start, 916f46b5a66SChristoph Hellwig root->root_key.objectid, 917f46b5a66SChristoph Hellwig trans->transid, 9183bb1a1bcSYan Zheng inode->i_ino); 919ae01a0abSYan Zheng BUG_ON(ret); 920f46b5a66SChristoph Hellwig } 921c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 922c5c9cd4dSSage Weil u64 skip = 0; 923c5c9cd4dSSage Weil u64 trim = 0; 924c5c9cd4dSSage Weil if (off > key.offset) { 925c5c9cd4dSSage Weil skip = off - key.offset; 926c5c9cd4dSSage Weil new_key.offset += skip; 92731840ae1SZheng Yan } 928d397712bSChris Mason 929c5c9cd4dSSage Weil if (key.offset + datal > off+len) 930c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 931d397712bSChris Mason 932c5c9cd4dSSage Weil if (comp && (skip || trim)) { 933c5c9cd4dSSage Weil ret = -EINVAL; 934c5c9cd4dSSage Weil goto out; 93531840ae1SZheng Yan } 936c5c9cd4dSSage Weil size -= skip + trim; 937c5c9cd4dSSage Weil datal -= skip + trim; 938c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 939c5c9cd4dSSage Weil &new_key, size); 940c5c9cd4dSSage Weil if (ret) 941c5c9cd4dSSage Weil goto out; 942c5c9cd4dSSage Weil 943c5c9cd4dSSage Weil if (skip) { 944d397712bSChris Mason u32 start = 945d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 946c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 947c5c9cd4dSSage Weil datal); 948c5c9cd4dSSage Weil } 949c5c9cd4dSSage Weil 950c5c9cd4dSSage Weil leaf = path->nodes[0]; 951c5c9cd4dSSage Weil slot = path->slots[0]; 952c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 953c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 954c5c9cd4dSSage Weil size); 955c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 956c5c9cd4dSSage Weil } 957c5c9cd4dSSage Weil 958c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 959c5c9cd4dSSage Weil } 960c5c9cd4dSSage Weil 961c5c9cd4dSSage Weil next: 96231840ae1SZheng Yan btrfs_release_path(root, path); 963ae01a0abSYan Zheng key.offset++; 964ae01a0abSYan Zheng } 965f46b5a66SChristoph Hellwig ret = 0; 966f46b5a66SChristoph Hellwig out: 967ae01a0abSYan Zheng btrfs_release_path(root, path); 968ae01a0abSYan Zheng if (ret == 0) { 969ae01a0abSYan Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 970c5c9cd4dSSage Weil if (destoff + olen > inode->i_size) 971c5c9cd4dSSage Weil btrfs_i_size_write(inode, destoff + olen); 972ae01a0abSYan Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 973ae01a0abSYan Zheng ret = btrfs_update_inode(trans, root, inode); 974ae01a0abSYan Zheng } 975f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 976c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 977ae01a0abSYan Zheng if (ret) 978ae01a0abSYan Zheng vmtruncate(inode, 0); 979f46b5a66SChristoph Hellwig out_unlock: 980f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 981f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 982ae01a0abSYan Zheng vfree(buf); 983ae01a0abSYan Zheng btrfs_free_path(path); 984f46b5a66SChristoph Hellwig out_fput: 985f46b5a66SChristoph Hellwig fput(src_file); 986ab67b7c1SYan Zheng out_drop_write: 987ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 988f46b5a66SChristoph Hellwig return ret; 989f46b5a66SChristoph Hellwig } 990f46b5a66SChristoph Hellwig 9917a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 992c5c9cd4dSSage Weil { 993c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 994c5c9cd4dSSage Weil 9957a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 996c5c9cd4dSSage Weil return -EFAULT; 997c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 998c5c9cd4dSSage Weil args.src_length, args.dest_offset); 999c5c9cd4dSSage Weil } 1000c5c9cd4dSSage Weil 1001f46b5a66SChristoph Hellwig /* 1002f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1003f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1004f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1005f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1006f46b5a66SChristoph Hellwig */ 1007b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 1008f46b5a66SChristoph Hellwig { 1009f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1010f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1011f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1012f46b5a66SChristoph Hellwig int ret = 0; 1013f46b5a66SChristoph Hellwig 1014df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 1015df5b5520SChristoph Hellwig return -EPERM; 1016df5b5520SChristoph Hellwig 1017f46b5a66SChristoph Hellwig if (file->private_data) { 1018f46b5a66SChristoph Hellwig ret = -EINPROGRESS; 1019f46b5a66SChristoph Hellwig goto out; 1020f46b5a66SChristoph Hellwig } 10219ca9ee09SSage Weil 1022c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1023c146afadSYan Zheng if (ret) 1024c146afadSYan Zheng goto out; 1025c146afadSYan Zheng 10269ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 10279ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 10289ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 10299ca9ee09SSage Weil 10309ca9ee09SSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 1031f46b5a66SChristoph Hellwig if (trans) 1032f46b5a66SChristoph Hellwig file->private_data = trans; 1033f46b5a66SChristoph Hellwig else 1034f46b5a66SChristoph Hellwig ret = -ENOMEM; 1035f46b5a66SChristoph Hellwig /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/ 1036f46b5a66SChristoph Hellwig out: 1037f46b5a66SChristoph Hellwig return ret; 1038f46b5a66SChristoph Hellwig } 1039f46b5a66SChristoph Hellwig 1040f46b5a66SChristoph Hellwig /* 1041f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1042f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1043f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1044f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1045f46b5a66SChristoph Hellwig */ 1046f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 1047f46b5a66SChristoph Hellwig { 1048f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1049f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1050f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1051f46b5a66SChristoph Hellwig int ret = 0; 1052f46b5a66SChristoph Hellwig 1053f46b5a66SChristoph Hellwig trans = file->private_data; 1054f46b5a66SChristoph Hellwig if (!trans) { 1055f46b5a66SChristoph Hellwig ret = -EINVAL; 1056f46b5a66SChristoph Hellwig goto out; 1057f46b5a66SChristoph Hellwig } 1058f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 1059b214107eSChristoph Hellwig file->private_data = NULL; 10609ca9ee09SSage Weil 10619ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 10629ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 10639ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 10649ca9ee09SSage Weil 1065cfc8ea87SSage Weil mnt_drop_write(file->f_path.mnt); 1066cfc8ea87SSage Weil 1067f46b5a66SChristoph Hellwig out: 1068f46b5a66SChristoph Hellwig return ret; 1069f46b5a66SChristoph Hellwig } 1070f46b5a66SChristoph Hellwig 1071f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 1072f46b5a66SChristoph Hellwig cmd, unsigned long arg) 1073f46b5a66SChristoph Hellwig { 1074f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 10754bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 1076f46b5a66SChristoph Hellwig 1077f46b5a66SChristoph Hellwig switch (cmd) { 1078f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 10794bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 0); 10803de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 10814bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 1); 1082f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 1083f46b5a66SChristoph Hellwig return btrfs_ioctl_defrag(file); 1084f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 10854bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 1086f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 10874bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 1088f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 10894bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 1090f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 1091f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 1092f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 1093c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 1094c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 10957a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 1096f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 1097f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 1098f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 1099f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 1100f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 1101f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 1102f46b5a66SChristoph Hellwig return 0; 1103f46b5a66SChristoph Hellwig } 1104f46b5a66SChristoph Hellwig 1105f46b5a66SChristoph Hellwig return -ENOTTY; 1106f46b5a66SChristoph Hellwig } 1107