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 855d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 865d4f98a2SYan Zheng 0, objectid, NULL, 0, 0, 0); 878e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 888e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 898e8a1e31SJosef Bacik goto fail; 908e8a1e31SJosef Bacik } 91f46b5a66SChristoph Hellwig 925d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 93f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 94f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 955d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 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); 1015d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 1025d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 1035d4f98a2SYan Zheng BTRFS_UUID_SIZE); 104f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 105f46b5a66SChristoph Hellwig 106f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 107f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 108f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 109f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 110f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 111a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 112f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 113f46b5a66SChristoph Hellwig 114f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 11584234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 116f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 117f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 118f46b5a66SChristoph Hellwig btrfs_set_root_used(&root_item, 0); 11980ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 120f46b5a66SChristoph Hellwig 121f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 122f46b5a66SChristoph Hellwig root_item.drop_level = 0; 123f46b5a66SChristoph Hellwig 124925baeddSChris Mason btrfs_tree_unlock(leaf); 125f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 126f46b5a66SChristoph Hellwig leaf = NULL; 127f46b5a66SChristoph Hellwig 128f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 129f46b5a66SChristoph Hellwig 130f46b5a66SChristoph Hellwig key.objectid = objectid; 1315d4f98a2SYan Zheng key.offset = 0; 132f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 133f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 134f46b5a66SChristoph Hellwig &root_item); 135f46b5a66SChristoph Hellwig if (ret) 136f46b5a66SChristoph Hellwig goto fail; 137f46b5a66SChristoph Hellwig 138f46b5a66SChristoph Hellwig /* 139f46b5a66SChristoph Hellwig * insert the directory item 140f46b5a66SChristoph Hellwig */ 141f46b5a66SChristoph Hellwig key.offset = (u64)-1; 1423de4586cSChris Mason dir = dentry->d_parent->d_inode; 1433de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 1443de4586cSChris Mason BUG_ON(ret); 1453de4586cSChris Mason 1463de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 147f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 1483de4586cSChris Mason BTRFS_FT_DIR, index); 149f46b5a66SChristoph Hellwig if (ret) 150f46b5a66SChristoph Hellwig goto fail; 1510660b5afSChris Mason 15252c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 15352c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 15452c26179SYan Zheng BUG_ON(ret); 15552c26179SYan Zheng 1560660b5afSChris Mason /* add the backref first */ 1570660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 1580660b5afSChris Mason objectid, BTRFS_ROOT_BACKREF_KEY, 1590660b5afSChris Mason root->root_key.objectid, 1600660b5afSChris Mason dir->i_ino, index, name, namelen); 1610660b5afSChris Mason 1620660b5afSChris Mason BUG_ON(ret); 1630660b5afSChris Mason 1640660b5afSChris Mason /* now add the forward ref */ 1650660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 1660660b5afSChris Mason root->root_key.objectid, BTRFS_ROOT_REF_KEY, 1670660b5afSChris Mason objectid, 1680660b5afSChris Mason dir->i_ino, index, name, namelen); 1690660b5afSChris Mason 1700660b5afSChris Mason BUG_ON(ret); 1710660b5afSChris Mason 172f46b5a66SChristoph Hellwig ret = btrfs_commit_transaction(trans, root); 173f46b5a66SChristoph Hellwig if (ret) 174f46b5a66SChristoph Hellwig goto fail_commit; 175f46b5a66SChristoph Hellwig 1763de4586cSChris Mason new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 177f46b5a66SChristoph Hellwig BUG_ON(!new_root); 178f46b5a66SChristoph Hellwig 179f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(new_root, 1); 180f46b5a66SChristoph Hellwig BUG_ON(!trans); 181f46b5a66SChristoph Hellwig 182d2fb3437SYan Zheng ret = btrfs_create_subvol_root(trans, new_root, dentry, new_dirid, 183f46b5a66SChristoph Hellwig BTRFS_I(dir)->block_group); 184f46b5a66SChristoph Hellwig if (ret) 185f46b5a66SChristoph Hellwig goto fail; 186f46b5a66SChristoph Hellwig 187f46b5a66SChristoph Hellwig fail: 188f46b5a66SChristoph Hellwig nr = trans->blocks_used; 189f46b5a66SChristoph Hellwig err = btrfs_commit_transaction(trans, new_root); 190f46b5a66SChristoph Hellwig if (err && !ret) 191f46b5a66SChristoph Hellwig ret = err; 192f46b5a66SChristoph Hellwig fail_commit: 193f46b5a66SChristoph Hellwig btrfs_btree_balance_dirty(root, nr); 194f46b5a66SChristoph Hellwig return ret; 195f46b5a66SChristoph Hellwig } 196f46b5a66SChristoph Hellwig 1973de4586cSChris Mason static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 1983de4586cSChris Mason char *name, int namelen) 199f46b5a66SChristoph Hellwig { 200f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 201f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2023de4586cSChris Mason int ret = 0; 203f46b5a66SChristoph Hellwig int err; 204f46b5a66SChristoph Hellwig unsigned long nr = 0; 205f46b5a66SChristoph Hellwig 206f46b5a66SChristoph Hellwig if (!root->ref_cows) 207f46b5a66SChristoph Hellwig return -EINVAL; 208f46b5a66SChristoph Hellwig 2096a63209fSJosef Bacik ret = btrfs_check_metadata_free_space(root); 210f46b5a66SChristoph Hellwig if (ret) 211f46b5a66SChristoph Hellwig goto fail_unlock; 212f46b5a66SChristoph Hellwig 2133de4586cSChris Mason pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 214f46b5a66SChristoph Hellwig if (!pending_snapshot) { 215f46b5a66SChristoph Hellwig ret = -ENOMEM; 216f46b5a66SChristoph Hellwig goto fail_unlock; 217f46b5a66SChristoph Hellwig } 218f46b5a66SChristoph Hellwig pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); 219f46b5a66SChristoph Hellwig if (!pending_snapshot->name) { 220f46b5a66SChristoph Hellwig ret = -ENOMEM; 221f46b5a66SChristoph Hellwig kfree(pending_snapshot); 222f46b5a66SChristoph Hellwig goto fail_unlock; 223f46b5a66SChristoph Hellwig } 224f46b5a66SChristoph Hellwig memcpy(pending_snapshot->name, name, namelen); 225f46b5a66SChristoph Hellwig pending_snapshot->name[namelen] = '\0'; 2263de4586cSChris Mason pending_snapshot->dentry = dentry; 227f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 228f46b5a66SChristoph Hellwig BUG_ON(!trans); 229f46b5a66SChristoph Hellwig pending_snapshot->root = root; 230f46b5a66SChristoph Hellwig list_add(&pending_snapshot->list, 231f46b5a66SChristoph Hellwig &trans->transaction->pending_snapshots); 232f46b5a66SChristoph Hellwig err = btrfs_commit_transaction(trans, root); 233f46b5a66SChristoph Hellwig 234f46b5a66SChristoph Hellwig fail_unlock: 235f46b5a66SChristoph Hellwig btrfs_btree_balance_dirty(root, nr); 236f46b5a66SChristoph Hellwig return ret; 237f46b5a66SChristoph Hellwig } 238f46b5a66SChristoph Hellwig 239cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 240cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 241cb8e7090SChristoph Hellwig { 242cb8e7090SChristoph Hellwig if (child->d_inode) 243cb8e7090SChristoph Hellwig return -EEXIST; 244cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 245cb8e7090SChristoph Hellwig return -ENOENT; 246cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 247cb8e7090SChristoph Hellwig } 248cb8e7090SChristoph Hellwig 249cb8e7090SChristoph Hellwig /* 250cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 251cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 252cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 253cb8e7090SChristoph Hellwig */ 254cb8e7090SChristoph Hellwig static noinline int btrfs_mksubvol(struct path *parent, char *name, 2553de4586cSChris Mason int mode, int namelen, 2563de4586cSChris Mason struct btrfs_root *snap_src) 257cb8e7090SChristoph Hellwig { 258cb8e7090SChristoph Hellwig struct dentry *dentry; 259cb8e7090SChristoph Hellwig int error; 260cb8e7090SChristoph Hellwig 261cb8e7090SChristoph Hellwig mutex_lock_nested(&parent->dentry->d_inode->i_mutex, I_MUTEX_PARENT); 262cb8e7090SChristoph Hellwig 263cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 264cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 265cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 266cb8e7090SChristoph Hellwig goto out_unlock; 267cb8e7090SChristoph Hellwig 268cb8e7090SChristoph Hellwig error = -EEXIST; 269cb8e7090SChristoph Hellwig if (dentry->d_inode) 270cb8e7090SChristoph Hellwig goto out_dput; 271cb8e7090SChristoph Hellwig 272cb8e7090SChristoph Hellwig if (!IS_POSIXACL(parent->dentry->d_inode)) 273ce3b0f8dSAl Viro mode &= ~current_umask(); 2743de4586cSChris Mason 275cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 276cb8e7090SChristoph Hellwig if (error) 277cb8e7090SChristoph Hellwig goto out_dput; 278cb8e7090SChristoph Hellwig 279cb8e7090SChristoph Hellwig error = btrfs_may_create(parent->dentry->d_inode, dentry); 280cb8e7090SChristoph Hellwig if (error) 281cb8e7090SChristoph Hellwig goto out_drop_write; 282cb8e7090SChristoph Hellwig 283cb8e7090SChristoph Hellwig /* 284cb8e7090SChristoph Hellwig * Actually perform the low-level subvolume creation after all 285cb8e7090SChristoph Hellwig * this VFS fuzz. 286cb8e7090SChristoph Hellwig * 287cb8e7090SChristoph Hellwig * Eventually we want to pass in an inode under which we create this 288cb8e7090SChristoph Hellwig * subvolume, but for now all are under the filesystem root. 289cb8e7090SChristoph Hellwig * 290cb8e7090SChristoph Hellwig * Also we should pass on the mode eventually to allow creating new 291cb8e7090SChristoph Hellwig * subvolume with specific mode bits. 292cb8e7090SChristoph Hellwig */ 2933de4586cSChris Mason if (snap_src) { 294ea9e8b11SChris Mason struct dentry *dir = dentry->d_parent; 295ea9e8b11SChris Mason struct dentry *test = dir->d_parent; 296ea9e8b11SChris Mason struct btrfs_path *path = btrfs_alloc_path(); 297ea9e8b11SChris Mason int ret; 298ea9e8b11SChris Mason u64 test_oid; 299ea9e8b11SChris Mason u64 parent_oid = BTRFS_I(dir->d_inode)->root->root_key.objectid; 300ea9e8b11SChris Mason 301ea9e8b11SChris Mason test_oid = snap_src->root_key.objectid; 302ea9e8b11SChris Mason 303ea9e8b11SChris Mason ret = btrfs_find_root_ref(snap_src->fs_info->tree_root, 304ea9e8b11SChris Mason path, parent_oid, test_oid); 305ea9e8b11SChris Mason if (ret == 0) 306ea9e8b11SChris Mason goto create; 307ea9e8b11SChris Mason btrfs_release_path(snap_src->fs_info->tree_root, path); 308ea9e8b11SChris Mason 309ea9e8b11SChris Mason /* we need to make sure we aren't creating a directory loop 310ea9e8b11SChris Mason * by taking a snapshot of something that has our current 311ea9e8b11SChris Mason * subvol in its directory tree. So, this loops through 312ea9e8b11SChris Mason * the dentries and checks the forward refs for each subvolume 313ea9e8b11SChris Mason * to see if is references the subvolume where we are 314ea9e8b11SChris Mason * placing this new snapshot. 315ea9e8b11SChris Mason */ 316ea9e8b11SChris Mason while (1) { 317ea9e8b11SChris Mason if (!test || 318ea9e8b11SChris Mason dir == snap_src->fs_info->sb->s_root || 319ea9e8b11SChris Mason test == snap_src->fs_info->sb->s_root || 320ea9e8b11SChris Mason test->d_inode->i_sb != snap_src->fs_info->sb) { 321ea9e8b11SChris Mason break; 322ea9e8b11SChris Mason } 323ea9e8b11SChris Mason if (S_ISLNK(test->d_inode->i_mode)) { 324d397712bSChris Mason printk(KERN_INFO "Btrfs symlink in snapshot " 325d397712bSChris Mason "path, failed\n"); 326ea9e8b11SChris Mason error = -EMLINK; 327ea9e8b11SChris Mason btrfs_free_path(path); 328ea9e8b11SChris Mason goto out_drop_write; 329ea9e8b11SChris Mason } 330ea9e8b11SChris Mason test_oid = 331ea9e8b11SChris Mason BTRFS_I(test->d_inode)->root->root_key.objectid; 332ea9e8b11SChris Mason ret = btrfs_find_root_ref(snap_src->fs_info->tree_root, 333ea9e8b11SChris Mason path, test_oid, parent_oid); 334ea9e8b11SChris Mason if (ret == 0) { 335d397712bSChris Mason printk(KERN_INFO "Btrfs snapshot creation " 336d397712bSChris Mason "failed, looping\n"); 337ea9e8b11SChris Mason error = -EMLINK; 338ea9e8b11SChris Mason btrfs_free_path(path); 339ea9e8b11SChris Mason goto out_drop_write; 340ea9e8b11SChris Mason } 341ea9e8b11SChris Mason btrfs_release_path(snap_src->fs_info->tree_root, path); 342ea9e8b11SChris Mason test = test->d_parent; 343ea9e8b11SChris Mason } 344ea9e8b11SChris Mason create: 345ea9e8b11SChris Mason btrfs_free_path(path); 3463de4586cSChris Mason error = create_snapshot(snap_src, dentry, name, namelen); 3473de4586cSChris Mason } else { 3483de4586cSChris Mason error = create_subvol(BTRFS_I(parent->dentry->d_inode)->root, 3493de4586cSChris Mason dentry, name, namelen); 3503de4586cSChris Mason } 351cb8e7090SChristoph Hellwig if (error) 352cb8e7090SChristoph Hellwig goto out_drop_write; 353cb8e7090SChristoph Hellwig 354cb8e7090SChristoph Hellwig fsnotify_mkdir(parent->dentry->d_inode, dentry); 355cb8e7090SChristoph Hellwig out_drop_write: 356cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 357cb8e7090SChristoph Hellwig out_dput: 358cb8e7090SChristoph Hellwig dput(dentry); 359cb8e7090SChristoph Hellwig out_unlock: 360cb8e7090SChristoph Hellwig mutex_unlock(&parent->dentry->d_inode->i_mutex); 361cb8e7090SChristoph Hellwig return error; 362cb8e7090SChristoph Hellwig } 363cb8e7090SChristoph Hellwig 364cb8e7090SChristoph Hellwig 365b2950863SChristoph Hellwig static int btrfs_defrag_file(struct file *file) 366f46b5a66SChristoph Hellwig { 367f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 368f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 369f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 3703eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 371f46b5a66SChristoph Hellwig struct page *page; 372f46b5a66SChristoph Hellwig unsigned long last_index; 373f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 374f46b5a66SChristoph Hellwig unsigned long total_read = 0; 375f46b5a66SChristoph Hellwig u64 page_start; 376f46b5a66SChristoph Hellwig u64 page_end; 377f46b5a66SChristoph Hellwig unsigned long i; 378f46b5a66SChristoph Hellwig int ret; 379f46b5a66SChristoph Hellwig 3806a63209fSJosef Bacik ret = btrfs_check_data_free_space(root, inode, inode->i_size); 381f46b5a66SChristoph Hellwig if (ret) 382f46b5a66SChristoph Hellwig return -ENOSPC; 383f46b5a66SChristoph Hellwig 384f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 385f46b5a66SChristoph Hellwig last_index = inode->i_size >> PAGE_CACHE_SHIFT; 386f46b5a66SChristoph Hellwig for (i = 0; i <= last_index; i++) { 387f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 388f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 389f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 390f46b5a66SChristoph Hellwig } 391f46b5a66SChristoph Hellwig total_read++; 3923eaa2885SChris Mason again: 393f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 394f46b5a66SChristoph Hellwig if (!page) 395f46b5a66SChristoph Hellwig goto out_unlock; 396f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 397f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 398f46b5a66SChristoph Hellwig lock_page(page); 399f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 400f46b5a66SChristoph Hellwig unlock_page(page); 401f46b5a66SChristoph Hellwig page_cache_release(page); 402f46b5a66SChristoph Hellwig goto out_unlock; 403f46b5a66SChristoph Hellwig } 404f46b5a66SChristoph Hellwig } 405f46b5a66SChristoph Hellwig 406f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 407f46b5a66SChristoph Hellwig 408f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 409f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 410f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 4113eaa2885SChris Mason 4123eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 4133eaa2885SChris Mason if (ordered) { 4143eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 4153eaa2885SChris Mason unlock_page(page); 4163eaa2885SChris Mason page_cache_release(page); 4173eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 4183eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 4193eaa2885SChris Mason goto again; 4203eaa2885SChris Mason } 4213eaa2885SChris Mason set_page_extent_mapped(page); 4223eaa2885SChris Mason 423f87f057bSChris Mason /* 424f87f057bSChris Mason * this makes sure page_mkwrite is called on the 425f87f057bSChris Mason * page if it is dirtied again later 426f87f057bSChris Mason */ 427f87f057bSChris Mason clear_page_dirty_for_io(page); 428f87f057bSChris Mason 429ea8c2819SChris Mason btrfs_set_extent_delalloc(inode, page_start, page_end); 430f46b5a66SChristoph Hellwig 431f46b5a66SChristoph Hellwig unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 432f46b5a66SChristoph Hellwig set_page_dirty(page); 433f46b5a66SChristoph Hellwig unlock_page(page); 434f46b5a66SChristoph Hellwig page_cache_release(page); 435f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 436f46b5a66SChristoph Hellwig } 437f46b5a66SChristoph Hellwig 438f46b5a66SChristoph Hellwig out_unlock: 439f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 440f46b5a66SChristoph Hellwig return 0; 441f46b5a66SChristoph Hellwig } 442f46b5a66SChristoph Hellwig 443f46b5a66SChristoph Hellwig static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) 444f46b5a66SChristoph Hellwig { 445f46b5a66SChristoph Hellwig u64 new_size; 446f46b5a66SChristoph Hellwig u64 old_size; 447f46b5a66SChristoph Hellwig u64 devid = 1; 448f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 449f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 450f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 451f46b5a66SChristoph Hellwig char *sizestr; 452f46b5a66SChristoph Hellwig char *devstr = NULL; 453f46b5a66SChristoph Hellwig int ret = 0; 454f46b5a66SChristoph Hellwig int namelen; 455f46b5a66SChristoph Hellwig int mod = 0; 456f46b5a66SChristoph Hellwig 457c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 458c146afadSYan Zheng return -EROFS; 459c146afadSYan Zheng 460e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 461e441d54dSChris Mason return -EPERM; 462e441d54dSChris Mason 463dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 464dae7b665SLi Zefan if (IS_ERR(vol_args)) 465dae7b665SLi Zefan return PTR_ERR(vol_args); 4665516e595SMark Fasheh 4675516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 468f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 469f46b5a66SChristoph Hellwig 4707d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 471f46b5a66SChristoph Hellwig sizestr = vol_args->name; 472f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 473f46b5a66SChristoph Hellwig if (devstr) { 474f46b5a66SChristoph Hellwig char *end; 475f46b5a66SChristoph Hellwig sizestr = devstr + 1; 476f46b5a66SChristoph Hellwig *devstr = '\0'; 477f46b5a66SChristoph Hellwig devstr = vol_args->name; 478f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 47921380931SJoel Becker printk(KERN_INFO "resizing devid %llu\n", 48021380931SJoel Becker (unsigned long long)devid); 481f46b5a66SChristoph Hellwig } 4822b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 483f46b5a66SChristoph Hellwig if (!device) { 48421380931SJoel Becker printk(KERN_INFO "resizer unable to find device %llu\n", 48521380931SJoel Becker (unsigned long long)devid); 486f46b5a66SChristoph Hellwig ret = -EINVAL; 487f46b5a66SChristoph Hellwig goto out_unlock; 488f46b5a66SChristoph Hellwig } 489f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 490f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 491f46b5a66SChristoph Hellwig else { 492f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 493f46b5a66SChristoph Hellwig mod = -1; 494f46b5a66SChristoph Hellwig sizestr++; 495f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 496f46b5a66SChristoph Hellwig mod = 1; 497f46b5a66SChristoph Hellwig sizestr++; 498f46b5a66SChristoph Hellwig } 499f46b5a66SChristoph Hellwig new_size = btrfs_parse_size(sizestr); 500f46b5a66SChristoph Hellwig if (new_size == 0) { 501f46b5a66SChristoph Hellwig ret = -EINVAL; 502f46b5a66SChristoph Hellwig goto out_unlock; 503f46b5a66SChristoph Hellwig } 504f46b5a66SChristoph Hellwig } 505f46b5a66SChristoph Hellwig 506f46b5a66SChristoph Hellwig old_size = device->total_bytes; 507f46b5a66SChristoph Hellwig 508f46b5a66SChristoph Hellwig if (mod < 0) { 509f46b5a66SChristoph Hellwig if (new_size > old_size) { 510f46b5a66SChristoph Hellwig ret = -EINVAL; 511f46b5a66SChristoph Hellwig goto out_unlock; 512f46b5a66SChristoph Hellwig } 513f46b5a66SChristoph Hellwig new_size = old_size - new_size; 514f46b5a66SChristoph Hellwig } else if (mod > 0) { 515f46b5a66SChristoph Hellwig new_size = old_size + new_size; 516f46b5a66SChristoph Hellwig } 517f46b5a66SChristoph Hellwig 518f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 519f46b5a66SChristoph Hellwig ret = -EINVAL; 520f46b5a66SChristoph Hellwig goto out_unlock; 521f46b5a66SChristoph Hellwig } 522f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 523f46b5a66SChristoph Hellwig ret = -EFBIG; 524f46b5a66SChristoph Hellwig goto out_unlock; 525f46b5a66SChristoph Hellwig } 526f46b5a66SChristoph Hellwig 527f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 528f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 529f46b5a66SChristoph Hellwig 530f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 531f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 532f46b5a66SChristoph Hellwig 533f46b5a66SChristoph Hellwig if (new_size > old_size) { 534f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 535f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 536f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 537f46b5a66SChristoph Hellwig } else { 538f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 539f46b5a66SChristoph Hellwig } 540f46b5a66SChristoph Hellwig 541f46b5a66SChristoph Hellwig out_unlock: 5427d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 543f46b5a66SChristoph Hellwig kfree(vol_args); 544f46b5a66SChristoph Hellwig return ret; 545f46b5a66SChristoph Hellwig } 546f46b5a66SChristoph Hellwig 547cb8e7090SChristoph Hellwig static noinline int btrfs_ioctl_snap_create(struct file *file, 5483de4586cSChris Mason void __user *arg, int subvol) 549f46b5a66SChristoph Hellwig { 550cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 551f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 552f46b5a66SChristoph Hellwig struct btrfs_dir_item *di; 553f46b5a66SChristoph Hellwig struct btrfs_path *path; 5543de4586cSChris Mason struct file *src_file; 555f46b5a66SChristoph Hellwig u64 root_dirid; 556f46b5a66SChristoph Hellwig int namelen; 5573de4586cSChris Mason int ret = 0; 558f46b5a66SChristoph Hellwig 559c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 560c146afadSYan Zheng return -EROFS; 561c146afadSYan Zheng 562dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 563dae7b665SLi Zefan if (IS_ERR(vol_args)) 564dae7b665SLi Zefan return PTR_ERR(vol_args); 565f46b5a66SChristoph Hellwig 5665516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 567f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 568f46b5a66SChristoph Hellwig if (strchr(vol_args->name, '/')) { 569f46b5a66SChristoph Hellwig ret = -EINVAL; 570f46b5a66SChristoph Hellwig goto out; 571f46b5a66SChristoph Hellwig } 572f46b5a66SChristoph Hellwig 573f46b5a66SChristoph Hellwig path = btrfs_alloc_path(); 574f46b5a66SChristoph Hellwig if (!path) { 575f46b5a66SChristoph Hellwig ret = -ENOMEM; 576f46b5a66SChristoph Hellwig goto out; 577f46b5a66SChristoph Hellwig } 578f46b5a66SChristoph Hellwig 579f46b5a66SChristoph Hellwig root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, 580f46b5a66SChristoph Hellwig di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, 581f46b5a66SChristoph Hellwig path, root_dirid, 582f46b5a66SChristoph Hellwig vol_args->name, namelen, 0); 583f46b5a66SChristoph Hellwig btrfs_free_path(path); 584f46b5a66SChristoph Hellwig 585f46b5a66SChristoph Hellwig if (di && !IS_ERR(di)) { 586f46b5a66SChristoph Hellwig ret = -EEXIST; 587f46b5a66SChristoph Hellwig goto out; 588f46b5a66SChristoph Hellwig } 589f46b5a66SChristoph Hellwig 590f46b5a66SChristoph Hellwig if (IS_ERR(di)) { 591f46b5a66SChristoph Hellwig ret = PTR_ERR(di); 592f46b5a66SChristoph Hellwig goto out; 593f46b5a66SChristoph Hellwig } 594f46b5a66SChristoph Hellwig 5953de4586cSChris Mason if (subvol) { 596cb8e7090SChristoph Hellwig ret = btrfs_mksubvol(&file->f_path, vol_args->name, 597cb8e7090SChristoph Hellwig file->f_path.dentry->d_inode->i_mode, 5983de4586cSChris Mason namelen, NULL); 599cb8e7090SChristoph Hellwig } else { 6003de4586cSChris Mason struct inode *src_inode; 6013de4586cSChris Mason src_file = fget(vol_args->fd); 6023de4586cSChris Mason if (!src_file) { 6033de4586cSChris Mason ret = -EINVAL; 6043de4586cSChris Mason goto out; 6053de4586cSChris Mason } 6063de4586cSChris Mason 6073de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 6083de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 609d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 610d397712bSChris Mason "another FS\n"); 6113de4586cSChris Mason ret = -EINVAL; 6123de4586cSChris Mason fput(src_file); 6133de4586cSChris Mason goto out; 6143de4586cSChris Mason } 6153de4586cSChris Mason ret = btrfs_mksubvol(&file->f_path, vol_args->name, 6163de4586cSChris Mason file->f_path.dentry->d_inode->i_mode, 6173de4586cSChris Mason namelen, BTRFS_I(src_inode)->root); 6183de4586cSChris Mason fput(src_file); 619cb8e7090SChristoph Hellwig } 620cb8e7090SChristoph Hellwig 621f46b5a66SChristoph Hellwig out: 622f46b5a66SChristoph Hellwig kfree(vol_args); 623f46b5a66SChristoph Hellwig return ret; 624f46b5a66SChristoph Hellwig } 625f46b5a66SChristoph Hellwig 626f46b5a66SChristoph Hellwig static int btrfs_ioctl_defrag(struct file *file) 627f46b5a66SChristoph Hellwig { 628f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 629f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 630c146afadSYan Zheng int ret; 631c146afadSYan Zheng 632c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 633c146afadSYan Zheng if (ret) 634c146afadSYan Zheng return ret; 635f46b5a66SChristoph Hellwig 636f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 637f46b5a66SChristoph Hellwig case S_IFDIR: 638e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 639e441d54dSChris Mason ret = -EPERM; 640e441d54dSChris Mason goto out; 641e441d54dSChris Mason } 642f46b5a66SChristoph Hellwig btrfs_defrag_root(root, 0); 643f46b5a66SChristoph Hellwig btrfs_defrag_root(root->fs_info->extent_root, 0); 644f46b5a66SChristoph Hellwig break; 645f46b5a66SChristoph Hellwig case S_IFREG: 646e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 647e441d54dSChris Mason ret = -EINVAL; 648e441d54dSChris Mason goto out; 649e441d54dSChris Mason } 650f46b5a66SChristoph Hellwig btrfs_defrag_file(file); 651f46b5a66SChristoph Hellwig break; 652f46b5a66SChristoph Hellwig } 653e441d54dSChris Mason out: 654ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 655e441d54dSChris Mason return ret; 656f46b5a66SChristoph Hellwig } 657f46b5a66SChristoph Hellwig 658b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 659f46b5a66SChristoph Hellwig { 660f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 661f46b5a66SChristoph Hellwig int ret; 662f46b5a66SChristoph Hellwig 663e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 664e441d54dSChris Mason return -EPERM; 665e441d54dSChris Mason 666dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 667dae7b665SLi Zefan if (IS_ERR(vol_args)) 668dae7b665SLi Zefan return PTR_ERR(vol_args); 669f46b5a66SChristoph Hellwig 6705516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 671f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 672f46b5a66SChristoph Hellwig 673f46b5a66SChristoph Hellwig kfree(vol_args); 674f46b5a66SChristoph Hellwig return ret; 675f46b5a66SChristoph Hellwig } 676f46b5a66SChristoph Hellwig 677b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 678f46b5a66SChristoph Hellwig { 679f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 680f46b5a66SChristoph Hellwig int ret; 681f46b5a66SChristoph Hellwig 682e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 683e441d54dSChris Mason return -EPERM; 684e441d54dSChris Mason 685c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 686c146afadSYan Zheng return -EROFS; 687c146afadSYan Zheng 688dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 689dae7b665SLi Zefan if (IS_ERR(vol_args)) 690dae7b665SLi Zefan return PTR_ERR(vol_args); 691f46b5a66SChristoph Hellwig 6925516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 693f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 694f46b5a66SChristoph Hellwig 695f46b5a66SChristoph Hellwig kfree(vol_args); 696f46b5a66SChristoph Hellwig return ret; 697f46b5a66SChristoph Hellwig } 698f46b5a66SChristoph Hellwig 699b2950863SChristoph Hellwig static long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 700b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 701f46b5a66SChristoph Hellwig { 702f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 703f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 704f46b5a66SChristoph Hellwig struct file *src_file; 705f46b5a66SChristoph Hellwig struct inode *src; 706f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 707f46b5a66SChristoph Hellwig struct btrfs_path *path; 708f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 709ae01a0abSYan Zheng char *buf; 710ae01a0abSYan Zheng struct btrfs_key key; 711f46b5a66SChristoph Hellwig u32 nritems; 712f46b5a66SChristoph Hellwig int slot; 713ae01a0abSYan Zheng int ret; 714c5c9cd4dSSage Weil u64 len = olen; 715c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 716c5c9cd4dSSage Weil u64 hint_byte; 717d20f7043SChris Mason 718c5c9cd4dSSage Weil /* 719c5c9cd4dSSage Weil * TODO: 720c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 721c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 722c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 723c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 724c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 725c5c9cd4dSSage Weil * they don't overlap)? 726c5c9cd4dSSage Weil */ 727c5c9cd4dSSage Weil 728e441d54dSChris Mason /* the destination must be opened for writing */ 729e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) 730e441d54dSChris Mason return -EINVAL; 731e441d54dSChris Mason 732c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 733c146afadSYan Zheng if (ret) 734c146afadSYan Zheng return ret; 735c146afadSYan Zheng 736c5c9cd4dSSage Weil src_file = fget(srcfd); 737ab67b7c1SYan Zheng if (!src_file) { 738ab67b7c1SYan Zheng ret = -EBADF; 739ab67b7c1SYan Zheng goto out_drop_write; 740ab67b7c1SYan Zheng } 741f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 742f46b5a66SChristoph Hellwig 743c5c9cd4dSSage Weil ret = -EINVAL; 744c5c9cd4dSSage Weil if (src == inode) 745c5c9cd4dSSage Weil goto out_fput; 746c5c9cd4dSSage Weil 747ae01a0abSYan Zheng ret = -EISDIR; 748ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 749f46b5a66SChristoph Hellwig goto out_fput; 750f46b5a66SChristoph Hellwig 751ae01a0abSYan Zheng ret = -EXDEV; 752ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 753ae01a0abSYan Zheng goto out_fput; 754ae01a0abSYan Zheng 755ae01a0abSYan Zheng ret = -ENOMEM; 756ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 757ae01a0abSYan Zheng if (!buf) 758ae01a0abSYan Zheng goto out_fput; 759ae01a0abSYan Zheng 760ae01a0abSYan Zheng path = btrfs_alloc_path(); 761ae01a0abSYan Zheng if (!path) { 762ae01a0abSYan Zheng vfree(buf); 763ae01a0abSYan Zheng goto out_fput; 764ae01a0abSYan Zheng } 765ae01a0abSYan Zheng path->reada = 2; 766ae01a0abSYan Zheng 767f46b5a66SChristoph Hellwig if (inode < src) { 768f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 769f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 770f46b5a66SChristoph Hellwig } else { 771f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 772f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 773f46b5a66SChristoph Hellwig } 774f46b5a66SChristoph Hellwig 775c5c9cd4dSSage Weil /* determine range to clone */ 776c5c9cd4dSSage Weil ret = -EINVAL; 777c5c9cd4dSSage Weil if (off >= src->i_size || off + len > src->i_size) 778f46b5a66SChristoph Hellwig goto out_unlock; 779c5c9cd4dSSage Weil if (len == 0) 780c5c9cd4dSSage Weil olen = len = src->i_size - off; 781c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 782c5c9cd4dSSage Weil if (off + len == src->i_size) 783c5c9cd4dSSage Weil len = ((src->i_size + bs-1) & ~(bs-1)) 784c5c9cd4dSSage Weil - off; 785c5c9cd4dSSage Weil 786c5c9cd4dSSage Weil /* verify the end result is block aligned */ 787c5c9cd4dSSage Weil if ((off & (bs-1)) || 788c5c9cd4dSSage Weil ((off + len) & (bs-1))) 789c5c9cd4dSSage Weil goto out_unlock; 790c5c9cd4dSSage Weil 791f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 792f46b5a66SChristoph Hellwig another, and lock file content */ 793f46b5a66SChristoph Hellwig while (1) { 79431840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 795c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 796c5c9cd4dSSage Weil ordered = btrfs_lookup_first_ordered_extent(inode, off+len); 797ae01a0abSYan Zheng if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) 798f46b5a66SChristoph Hellwig break; 799c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 800ae01a0abSYan Zheng if (ordered) 801ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 802c5c9cd4dSSage Weil btrfs_wait_ordered_range(src, off, off+len); 803f46b5a66SChristoph Hellwig } 804f46b5a66SChristoph Hellwig 805ae01a0abSYan Zheng trans = btrfs_start_transaction(root, 1); 806ae01a0abSYan Zheng BUG_ON(!trans); 807ae01a0abSYan Zheng 808c5c9cd4dSSage Weil /* punch hole in destination first */ 809e980b50cSChris Mason btrfs_drop_extents(trans, root, inode, off, off + len, 810e980b50cSChris Mason off + len, 0, &hint_byte); 811c5c9cd4dSSage Weil 812c5c9cd4dSSage Weil /* clone data */ 813f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 814ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 815ae01a0abSYan Zheng key.offset = 0; 816f46b5a66SChristoph Hellwig 817f46b5a66SChristoph Hellwig while (1) { 818f46b5a66SChristoph Hellwig /* 819f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 820f46b5a66SChristoph Hellwig * tree. 821f46b5a66SChristoph Hellwig */ 822f46b5a66SChristoph Hellwig ret = btrfs_search_slot(trans, root, &key, path, 0, 0); 823f46b5a66SChristoph Hellwig if (ret < 0) 824f46b5a66SChristoph Hellwig goto out; 825f46b5a66SChristoph Hellwig 826ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 827ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 828f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 829f46b5a66SChristoph Hellwig if (ret < 0) 830f46b5a66SChristoph Hellwig goto out; 831f46b5a66SChristoph Hellwig if (ret > 0) 832f46b5a66SChristoph Hellwig break; 833ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 834f46b5a66SChristoph Hellwig } 835f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 836f46b5a66SChristoph Hellwig slot = path->slots[0]; 837f46b5a66SChristoph Hellwig 838ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 839d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 840f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 841f46b5a66SChristoph Hellwig break; 842f46b5a66SChristoph Hellwig 843c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 844c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 845c5c9cd4dSSage Weil int type; 84631840ae1SZheng Yan u32 size; 84731840ae1SZheng Yan struct btrfs_key new_key; 848c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 849c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 850c5c9cd4dSSage Weil u8 comp; 85131840ae1SZheng Yan 85231840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 85331840ae1SZheng Yan read_extent_buffer(leaf, buf, 85431840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 85531840ae1SZheng Yan size); 856c5c9cd4dSSage Weil 857c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 858c5c9cd4dSSage Weil struct btrfs_file_extent_item); 859c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 860c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 861c5c9cd4dSSage Weil if (type == BTRFS_FILE_EXTENT_REG) { 862d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 863d397712bSChris Mason extent); 864d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 865d397712bSChris Mason extent); 866c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 867d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 868d397712bSChris Mason extent); 869c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 870c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 871c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 872c5c9cd4dSSage Weil extent); 873c5c9cd4dSSage Weil } 87431840ae1SZheng Yan btrfs_release_path(root, path); 87531840ae1SZheng Yan 876c5c9cd4dSSage Weil if (key.offset + datal < off || 877c5c9cd4dSSage Weil key.offset >= off+len) 878c5c9cd4dSSage Weil goto next; 879c5c9cd4dSSage Weil 88031840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 88131840ae1SZheng Yan new_key.objectid = inode->i_ino; 882c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 883c5c9cd4dSSage Weil 884c5c9cd4dSSage Weil if (type == BTRFS_FILE_EXTENT_REG) { 88531840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 88631840ae1SZheng Yan &new_key, size); 88731840ae1SZheng Yan if (ret) 88831840ae1SZheng Yan goto out; 88931840ae1SZheng Yan 89031840ae1SZheng Yan leaf = path->nodes[0]; 89131840ae1SZheng Yan slot = path->slots[0]; 89231840ae1SZheng Yan write_extent_buffer(leaf, buf, 89331840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 89431840ae1SZheng Yan size); 895ae01a0abSYan Zheng 896f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 897f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 898c5c9cd4dSSage Weil 899c5c9cd4dSSage Weil if (off > key.offset) { 900c5c9cd4dSSage Weil datao += off - key.offset; 901c5c9cd4dSSage Weil datal -= off - key.offset; 902c5c9cd4dSSage Weil } 903c5c9cd4dSSage Weil if (key.offset + datao + datal + key.offset > 904c5c9cd4dSSage Weil off + len) 905c5c9cd4dSSage Weil datal = off + len - key.offset - datao; 906c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 907c5c9cd4dSSage Weil if (!disko) 908c5c9cd4dSSage Weil datao = 0; 909c5c9cd4dSSage Weil 910c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 911c5c9cd4dSSage Weil datao); 912c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 913c5c9cd4dSSage Weil datal); 914c5c9cd4dSSage Weil if (disko) { 915c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 916ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 9175d4f98a2SYan Zheng disko, diskl, 0, 918f46b5a66SChristoph Hellwig root->root_key.objectid, 9195d4f98a2SYan Zheng inode->i_ino, 9205d4f98a2SYan Zheng new_key.offset - datao); 921ae01a0abSYan Zheng BUG_ON(ret); 922f46b5a66SChristoph Hellwig } 923c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 924c5c9cd4dSSage Weil u64 skip = 0; 925c5c9cd4dSSage Weil u64 trim = 0; 926c5c9cd4dSSage Weil if (off > key.offset) { 927c5c9cd4dSSage Weil skip = off - key.offset; 928c5c9cd4dSSage Weil new_key.offset += skip; 92931840ae1SZheng Yan } 930d397712bSChris Mason 931c5c9cd4dSSage Weil if (key.offset + datal > off+len) 932c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 933d397712bSChris Mason 934c5c9cd4dSSage Weil if (comp && (skip || trim)) { 935c5c9cd4dSSage Weil ret = -EINVAL; 936c5c9cd4dSSage Weil goto out; 93731840ae1SZheng Yan } 938c5c9cd4dSSage Weil size -= skip + trim; 939c5c9cd4dSSage Weil datal -= skip + trim; 940c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 941c5c9cd4dSSage Weil &new_key, size); 942c5c9cd4dSSage Weil if (ret) 943c5c9cd4dSSage Weil goto out; 944c5c9cd4dSSage Weil 945c5c9cd4dSSage Weil if (skip) { 946d397712bSChris Mason u32 start = 947d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 948c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 949c5c9cd4dSSage Weil datal); 950c5c9cd4dSSage Weil } 951c5c9cd4dSSage Weil 952c5c9cd4dSSage Weil leaf = path->nodes[0]; 953c5c9cd4dSSage Weil slot = path->slots[0]; 954c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 955c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 956c5c9cd4dSSage Weil size); 957c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 958c5c9cd4dSSage Weil } 959c5c9cd4dSSage Weil 960c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 961c5c9cd4dSSage Weil } 962c5c9cd4dSSage Weil 963c5c9cd4dSSage Weil next: 96431840ae1SZheng Yan btrfs_release_path(root, path); 965ae01a0abSYan Zheng key.offset++; 966ae01a0abSYan Zheng } 967f46b5a66SChristoph Hellwig ret = 0; 968f46b5a66SChristoph Hellwig out: 969ae01a0abSYan Zheng btrfs_release_path(root, path); 970ae01a0abSYan Zheng if (ret == 0) { 971ae01a0abSYan Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 972c5c9cd4dSSage Weil if (destoff + olen > inode->i_size) 973c5c9cd4dSSage Weil btrfs_i_size_write(inode, destoff + olen); 974ae01a0abSYan Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 975ae01a0abSYan Zheng ret = btrfs_update_inode(trans, root, inode); 976ae01a0abSYan Zheng } 977f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 978c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 979ae01a0abSYan Zheng if (ret) 980ae01a0abSYan Zheng vmtruncate(inode, 0); 981f46b5a66SChristoph Hellwig out_unlock: 982f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 983f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 984ae01a0abSYan Zheng vfree(buf); 985ae01a0abSYan Zheng btrfs_free_path(path); 986f46b5a66SChristoph Hellwig out_fput: 987f46b5a66SChristoph Hellwig fput(src_file); 988ab67b7c1SYan Zheng out_drop_write: 989ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 990f46b5a66SChristoph Hellwig return ret; 991f46b5a66SChristoph Hellwig } 992f46b5a66SChristoph Hellwig 9937a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 994c5c9cd4dSSage Weil { 995c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 996c5c9cd4dSSage Weil 9977a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 998c5c9cd4dSSage Weil return -EFAULT; 999c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 1000c5c9cd4dSSage Weil args.src_length, args.dest_offset); 1001c5c9cd4dSSage Weil } 1002c5c9cd4dSSage Weil 1003f46b5a66SChristoph Hellwig /* 1004f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1005f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1006f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1007f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1008f46b5a66SChristoph Hellwig */ 1009b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 1010f46b5a66SChristoph Hellwig { 1011f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1012f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1013f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1014f46b5a66SChristoph Hellwig int ret = 0; 1015f46b5a66SChristoph Hellwig 1016df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 1017df5b5520SChristoph Hellwig return -EPERM; 1018df5b5520SChristoph Hellwig 1019f46b5a66SChristoph Hellwig if (file->private_data) { 1020f46b5a66SChristoph Hellwig ret = -EINPROGRESS; 1021f46b5a66SChristoph Hellwig goto out; 1022f46b5a66SChristoph Hellwig } 10239ca9ee09SSage Weil 1024c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1025c146afadSYan Zheng if (ret) 1026c146afadSYan Zheng goto out; 1027c146afadSYan Zheng 10289ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 10299ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 10309ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 10319ca9ee09SSage Weil 10329ca9ee09SSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 1033f46b5a66SChristoph Hellwig if (trans) 1034f46b5a66SChristoph Hellwig file->private_data = trans; 1035f46b5a66SChristoph Hellwig else 1036f46b5a66SChristoph Hellwig ret = -ENOMEM; 1037f46b5a66SChristoph Hellwig /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/ 1038f46b5a66SChristoph Hellwig out: 1039f46b5a66SChristoph Hellwig return ret; 1040f46b5a66SChristoph Hellwig } 1041f46b5a66SChristoph Hellwig 1042f46b5a66SChristoph Hellwig /* 1043f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1044f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1045f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1046f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1047f46b5a66SChristoph Hellwig */ 1048f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 1049f46b5a66SChristoph Hellwig { 1050f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1051f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1052f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1053f46b5a66SChristoph Hellwig int ret = 0; 1054f46b5a66SChristoph Hellwig 1055f46b5a66SChristoph Hellwig trans = file->private_data; 1056f46b5a66SChristoph Hellwig if (!trans) { 1057f46b5a66SChristoph Hellwig ret = -EINVAL; 1058f46b5a66SChristoph Hellwig goto out; 1059f46b5a66SChristoph Hellwig } 1060f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 1061b214107eSChristoph Hellwig file->private_data = NULL; 10629ca9ee09SSage Weil 10639ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 10649ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 10659ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 10669ca9ee09SSage Weil 1067cfc8ea87SSage Weil mnt_drop_write(file->f_path.mnt); 1068cfc8ea87SSage Weil 1069f46b5a66SChristoph Hellwig out: 1070f46b5a66SChristoph Hellwig return ret; 1071f46b5a66SChristoph Hellwig } 1072f46b5a66SChristoph Hellwig 1073f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 1074f46b5a66SChristoph Hellwig cmd, unsigned long arg) 1075f46b5a66SChristoph Hellwig { 1076f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 10774bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 1078f46b5a66SChristoph Hellwig 1079f46b5a66SChristoph Hellwig switch (cmd) { 1080f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 10814bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 0); 10823de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 10834bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 1); 1084f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 1085f46b5a66SChristoph Hellwig return btrfs_ioctl_defrag(file); 1086f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 10874bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 1088f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 10894bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 1090f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 10914bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 1092f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 1093f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 1094f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 1095c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 1096c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 10977a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 1098f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 1099f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 1100f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 1101f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 1102f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 1103f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 1104f46b5a66SChristoph Hellwig return 0; 1105f46b5a66SChristoph Hellwig } 1106f46b5a66SChristoph Hellwig 1107f46b5a66SChristoph Hellwig return -ENOTTY; 1108f46b5a66SChristoph Hellwig } 1109