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/version.h> 42f46b5a66SChristoph Hellwig #include <linux/xattr.h> 437ea394f1SYan Zheng #include <linux/vmalloc.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 73f46b5a66SChristoph Hellwig ret = btrfs_check_free_space(root, 1, 0); 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 1490660b5afSChris Mason /* add the backref first */ 1500660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 1510660b5afSChris Mason objectid, BTRFS_ROOT_BACKREF_KEY, 1520660b5afSChris Mason root->root_key.objectid, 1530660b5afSChris Mason dir->i_ino, index, name, namelen); 1540660b5afSChris Mason 1550660b5afSChris Mason BUG_ON(ret); 1560660b5afSChris Mason 1570660b5afSChris Mason /* now add the forward ref */ 1580660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 1590660b5afSChris Mason root->root_key.objectid, BTRFS_ROOT_REF_KEY, 1600660b5afSChris Mason objectid, 1610660b5afSChris Mason dir->i_ino, index, name, namelen); 1620660b5afSChris Mason 1630660b5afSChris Mason BUG_ON(ret); 1640660b5afSChris Mason 165f46b5a66SChristoph Hellwig ret = btrfs_commit_transaction(trans, root); 166f46b5a66SChristoph Hellwig if (ret) 167f46b5a66SChristoph Hellwig goto fail_commit; 168f46b5a66SChristoph Hellwig 1693de4586cSChris Mason new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 170f46b5a66SChristoph Hellwig BUG_ON(!new_root); 171f46b5a66SChristoph Hellwig 172f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(new_root, 1); 173f46b5a66SChristoph Hellwig BUG_ON(!trans); 174f46b5a66SChristoph Hellwig 175cb8e7090SChristoph Hellwig ret = btrfs_create_subvol_root(new_root, dentry, trans, new_dirid, 176f46b5a66SChristoph Hellwig BTRFS_I(dir)->block_group); 177f46b5a66SChristoph Hellwig if (ret) 178f46b5a66SChristoph Hellwig goto fail; 179f46b5a66SChristoph Hellwig 180f46b5a66SChristoph Hellwig fail: 181f46b5a66SChristoph Hellwig nr = trans->blocks_used; 182f46b5a66SChristoph Hellwig err = btrfs_commit_transaction(trans, new_root); 183f46b5a66SChristoph Hellwig if (err && !ret) 184f46b5a66SChristoph Hellwig ret = err; 185f46b5a66SChristoph Hellwig fail_commit: 186f46b5a66SChristoph Hellwig btrfs_btree_balance_dirty(root, nr); 187f46b5a66SChristoph Hellwig return ret; 188f46b5a66SChristoph Hellwig } 189f46b5a66SChristoph Hellwig 1903de4586cSChris Mason static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 1913de4586cSChris Mason char *name, int namelen) 192f46b5a66SChristoph Hellwig { 193f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 194f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1953de4586cSChris Mason int ret = 0; 196f46b5a66SChristoph Hellwig int err; 197f46b5a66SChristoph Hellwig unsigned long nr = 0; 198f46b5a66SChristoph Hellwig 199f46b5a66SChristoph Hellwig if (!root->ref_cows) 200f46b5a66SChristoph Hellwig return -EINVAL; 201f46b5a66SChristoph Hellwig 202f46b5a66SChristoph Hellwig ret = btrfs_check_free_space(root, 1, 0); 203f46b5a66SChristoph Hellwig if (ret) 204f46b5a66SChristoph Hellwig goto fail_unlock; 205f46b5a66SChristoph Hellwig 2063de4586cSChris Mason pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 207f46b5a66SChristoph Hellwig if (!pending_snapshot) { 208f46b5a66SChristoph Hellwig ret = -ENOMEM; 209f46b5a66SChristoph Hellwig goto fail_unlock; 210f46b5a66SChristoph Hellwig } 211f46b5a66SChristoph Hellwig pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); 212f46b5a66SChristoph Hellwig if (!pending_snapshot->name) { 213f46b5a66SChristoph Hellwig ret = -ENOMEM; 214f46b5a66SChristoph Hellwig kfree(pending_snapshot); 215f46b5a66SChristoph Hellwig goto fail_unlock; 216f46b5a66SChristoph Hellwig } 217f46b5a66SChristoph Hellwig memcpy(pending_snapshot->name, name, namelen); 218f46b5a66SChristoph Hellwig pending_snapshot->name[namelen] = '\0'; 2193de4586cSChris Mason pending_snapshot->dentry = dentry; 220f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 221f46b5a66SChristoph Hellwig BUG_ON(!trans); 222f46b5a66SChristoph Hellwig pending_snapshot->root = root; 223f46b5a66SChristoph Hellwig list_add(&pending_snapshot->list, 224f46b5a66SChristoph Hellwig &trans->transaction->pending_snapshots); 225f46b5a66SChristoph Hellwig err = btrfs_commit_transaction(trans, root); 226f46b5a66SChristoph Hellwig 227f46b5a66SChristoph Hellwig fail_unlock: 228f46b5a66SChristoph Hellwig btrfs_btree_balance_dirty(root, nr); 229f46b5a66SChristoph Hellwig return ret; 230f46b5a66SChristoph Hellwig } 231f46b5a66SChristoph Hellwig 232cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 233cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 234cb8e7090SChristoph Hellwig { 235cb8e7090SChristoph Hellwig if (child->d_inode) 236cb8e7090SChristoph Hellwig return -EEXIST; 237cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 238cb8e7090SChristoph Hellwig return -ENOENT; 239cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 240cb8e7090SChristoph Hellwig } 241cb8e7090SChristoph Hellwig 242cb8e7090SChristoph Hellwig /* 243cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 244cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 245cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 246cb8e7090SChristoph Hellwig */ 247cb8e7090SChristoph Hellwig static noinline int btrfs_mksubvol(struct path *parent, char *name, 2483de4586cSChris Mason int mode, int namelen, 2493de4586cSChris Mason struct btrfs_root *snap_src) 250cb8e7090SChristoph Hellwig { 251cb8e7090SChristoph Hellwig struct dentry *dentry; 252cb8e7090SChristoph Hellwig int error; 253cb8e7090SChristoph Hellwig 254cb8e7090SChristoph Hellwig mutex_lock_nested(&parent->dentry->d_inode->i_mutex, I_MUTEX_PARENT); 255cb8e7090SChristoph Hellwig 256cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 257cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 258cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 259cb8e7090SChristoph Hellwig goto out_unlock; 260cb8e7090SChristoph Hellwig 261cb8e7090SChristoph Hellwig error = -EEXIST; 262cb8e7090SChristoph Hellwig if (dentry->d_inode) 263cb8e7090SChristoph Hellwig goto out_dput; 264cb8e7090SChristoph Hellwig 265cb8e7090SChristoph Hellwig if (!IS_POSIXACL(parent->dentry->d_inode)) 266cb8e7090SChristoph Hellwig mode &= ~current->fs->umask; 2673de4586cSChris Mason 268cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 269cb8e7090SChristoph Hellwig if (error) 270cb8e7090SChristoph Hellwig goto out_dput; 271cb8e7090SChristoph Hellwig 272cb8e7090SChristoph Hellwig error = btrfs_may_create(parent->dentry->d_inode, dentry); 273cb8e7090SChristoph Hellwig if (error) 274cb8e7090SChristoph Hellwig goto out_drop_write; 275cb8e7090SChristoph Hellwig 276cb8e7090SChristoph Hellwig /* 277cb8e7090SChristoph Hellwig * Actually perform the low-level subvolume creation after all 278cb8e7090SChristoph Hellwig * this VFS fuzz. 279cb8e7090SChristoph Hellwig * 280cb8e7090SChristoph Hellwig * Eventually we want to pass in an inode under which we create this 281cb8e7090SChristoph Hellwig * subvolume, but for now all are under the filesystem root. 282cb8e7090SChristoph Hellwig * 283cb8e7090SChristoph Hellwig * Also we should pass on the mode eventually to allow creating new 284cb8e7090SChristoph Hellwig * subvolume with specific mode bits. 285cb8e7090SChristoph Hellwig */ 2863de4586cSChris Mason if (snap_src) { 2873de4586cSChris Mason error = create_snapshot(snap_src, dentry, name, namelen); 2883de4586cSChris Mason } else { 2893de4586cSChris Mason error = create_subvol(BTRFS_I(parent->dentry->d_inode)->root, 2903de4586cSChris Mason dentry, name, namelen); 2913de4586cSChris Mason } 292cb8e7090SChristoph Hellwig if (error) 293cb8e7090SChristoph Hellwig goto out_drop_write; 294cb8e7090SChristoph Hellwig 295cb8e7090SChristoph Hellwig fsnotify_mkdir(parent->dentry->d_inode, dentry); 296cb8e7090SChristoph Hellwig out_drop_write: 297cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 298cb8e7090SChristoph Hellwig out_dput: 299cb8e7090SChristoph Hellwig dput(dentry); 300cb8e7090SChristoph Hellwig out_unlock: 301cb8e7090SChristoph Hellwig mutex_unlock(&parent->dentry->d_inode->i_mutex); 302cb8e7090SChristoph Hellwig return error; 303cb8e7090SChristoph Hellwig } 304cb8e7090SChristoph Hellwig 305cb8e7090SChristoph Hellwig 306f46b5a66SChristoph Hellwig int btrfs_defrag_file(struct file *file) 307f46b5a66SChristoph Hellwig { 308f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 309f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 310f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 3113eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 312f46b5a66SChristoph Hellwig struct page *page; 313f46b5a66SChristoph Hellwig unsigned long last_index; 314f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 315f46b5a66SChristoph Hellwig unsigned long total_read = 0; 316f46b5a66SChristoph Hellwig u64 page_start; 317f46b5a66SChristoph Hellwig u64 page_end; 318f46b5a66SChristoph Hellwig unsigned long i; 319f46b5a66SChristoph Hellwig int ret; 320f46b5a66SChristoph Hellwig 321f46b5a66SChristoph Hellwig ret = btrfs_check_free_space(root, inode->i_size, 0); 322f46b5a66SChristoph Hellwig if (ret) 323f46b5a66SChristoph Hellwig return -ENOSPC; 324f46b5a66SChristoph Hellwig 325f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 326f46b5a66SChristoph Hellwig last_index = inode->i_size >> PAGE_CACHE_SHIFT; 327f46b5a66SChristoph Hellwig for (i = 0; i <= last_index; i++) { 328f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 329f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 330f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 331f46b5a66SChristoph Hellwig } 332f46b5a66SChristoph Hellwig total_read++; 3333eaa2885SChris Mason again: 334f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 335f46b5a66SChristoph Hellwig if (!page) 336f46b5a66SChristoph Hellwig goto out_unlock; 337f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 338f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 339f46b5a66SChristoph Hellwig lock_page(page); 340f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 341f46b5a66SChristoph Hellwig unlock_page(page); 342f46b5a66SChristoph Hellwig page_cache_release(page); 343f46b5a66SChristoph Hellwig goto out_unlock; 344f46b5a66SChristoph Hellwig } 345f46b5a66SChristoph Hellwig } 346f46b5a66SChristoph Hellwig 347f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 348f46b5a66SChristoph Hellwig 349f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 350f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 351f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 3523eaa2885SChris Mason 3533eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 3543eaa2885SChris Mason if (ordered) { 3553eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 3563eaa2885SChris Mason unlock_page(page); 3573eaa2885SChris Mason page_cache_release(page); 3583eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 3593eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 3603eaa2885SChris Mason goto again; 3613eaa2885SChris Mason } 3623eaa2885SChris Mason set_page_extent_mapped(page); 3633eaa2885SChris Mason 364f87f057bSChris Mason /* 365f87f057bSChris Mason * this makes sure page_mkwrite is called on the 366f87f057bSChris Mason * page if it is dirtied again later 367f87f057bSChris Mason */ 368f87f057bSChris Mason clear_page_dirty_for_io(page); 369f87f057bSChris Mason 370ea8c2819SChris Mason btrfs_set_extent_delalloc(inode, page_start, page_end); 371f46b5a66SChristoph Hellwig 372f46b5a66SChristoph Hellwig unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 373f46b5a66SChristoph Hellwig set_page_dirty(page); 374f46b5a66SChristoph Hellwig unlock_page(page); 375f46b5a66SChristoph Hellwig page_cache_release(page); 376f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 377f46b5a66SChristoph Hellwig } 378f46b5a66SChristoph Hellwig 379f46b5a66SChristoph Hellwig out_unlock: 380f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 381f46b5a66SChristoph Hellwig return 0; 382f46b5a66SChristoph Hellwig } 383f46b5a66SChristoph Hellwig 384f46b5a66SChristoph Hellwig /* 385f46b5a66SChristoph Hellwig * Called inside transaction, so use GFP_NOFS 386f46b5a66SChristoph Hellwig */ 387f46b5a66SChristoph Hellwig 388f46b5a66SChristoph Hellwig static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) 389f46b5a66SChristoph Hellwig { 390f46b5a66SChristoph Hellwig u64 new_size; 391f46b5a66SChristoph Hellwig u64 old_size; 392f46b5a66SChristoph Hellwig u64 devid = 1; 393f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 394f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 395f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 396f46b5a66SChristoph Hellwig char *sizestr; 397f46b5a66SChristoph Hellwig char *devstr = NULL; 398f46b5a66SChristoph Hellwig int ret = 0; 399f46b5a66SChristoph Hellwig int namelen; 400f46b5a66SChristoph Hellwig int mod = 0; 401f46b5a66SChristoph Hellwig 402c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 403c146afadSYan Zheng return -EROFS; 404c146afadSYan Zheng 405f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 406f46b5a66SChristoph Hellwig 407f46b5a66SChristoph Hellwig if (!vol_args) 408f46b5a66SChristoph Hellwig return -ENOMEM; 409f46b5a66SChristoph Hellwig 410f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 411f46b5a66SChristoph Hellwig ret = -EFAULT; 412f46b5a66SChristoph Hellwig goto out; 413f46b5a66SChristoph Hellwig } 4145516e595SMark Fasheh 4155516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 416f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 417f46b5a66SChristoph Hellwig 4187d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 419f46b5a66SChristoph Hellwig sizestr = vol_args->name; 420f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 421f46b5a66SChristoph Hellwig if (devstr) { 422f46b5a66SChristoph Hellwig char *end; 423f46b5a66SChristoph Hellwig sizestr = devstr + 1; 424f46b5a66SChristoph Hellwig *devstr = '\0'; 425f46b5a66SChristoph Hellwig devstr = vol_args->name; 426f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 427f46b5a66SChristoph Hellwig printk(KERN_INFO "resizing devid %llu\n", devid); 428f46b5a66SChristoph Hellwig } 4292b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 430f46b5a66SChristoph Hellwig if (!device) { 431f46b5a66SChristoph Hellwig printk(KERN_INFO "resizer unable to find device %llu\n", devid); 432f46b5a66SChristoph Hellwig ret = -EINVAL; 433f46b5a66SChristoph Hellwig goto out_unlock; 434f46b5a66SChristoph Hellwig } 435f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 436f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 437f46b5a66SChristoph Hellwig else { 438f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 439f46b5a66SChristoph Hellwig mod = -1; 440f46b5a66SChristoph Hellwig sizestr++; 441f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 442f46b5a66SChristoph Hellwig mod = 1; 443f46b5a66SChristoph Hellwig sizestr++; 444f46b5a66SChristoph Hellwig } 445f46b5a66SChristoph Hellwig new_size = btrfs_parse_size(sizestr); 446f46b5a66SChristoph Hellwig if (new_size == 0) { 447f46b5a66SChristoph Hellwig ret = -EINVAL; 448f46b5a66SChristoph Hellwig goto out_unlock; 449f46b5a66SChristoph Hellwig } 450f46b5a66SChristoph Hellwig } 451f46b5a66SChristoph Hellwig 452f46b5a66SChristoph Hellwig old_size = device->total_bytes; 453f46b5a66SChristoph Hellwig 454f46b5a66SChristoph Hellwig if (mod < 0) { 455f46b5a66SChristoph Hellwig if (new_size > old_size) { 456f46b5a66SChristoph Hellwig ret = -EINVAL; 457f46b5a66SChristoph Hellwig goto out_unlock; 458f46b5a66SChristoph Hellwig } 459f46b5a66SChristoph Hellwig new_size = old_size - new_size; 460f46b5a66SChristoph Hellwig } else if (mod > 0) { 461f46b5a66SChristoph Hellwig new_size = old_size + new_size; 462f46b5a66SChristoph Hellwig } 463f46b5a66SChristoph Hellwig 464f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 465f46b5a66SChristoph Hellwig ret = -EINVAL; 466f46b5a66SChristoph Hellwig goto out_unlock; 467f46b5a66SChristoph Hellwig } 468f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 469f46b5a66SChristoph Hellwig ret = -EFBIG; 470f46b5a66SChristoph Hellwig goto out_unlock; 471f46b5a66SChristoph Hellwig } 472f46b5a66SChristoph Hellwig 473f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 474f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 475f46b5a66SChristoph Hellwig 476f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 477f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 478f46b5a66SChristoph Hellwig 479f46b5a66SChristoph Hellwig if (new_size > old_size) { 480f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 481f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 482f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 483f46b5a66SChristoph Hellwig } else { 484f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 485f46b5a66SChristoph Hellwig } 486f46b5a66SChristoph Hellwig 487f46b5a66SChristoph Hellwig out_unlock: 4887d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 489f46b5a66SChristoph Hellwig out: 490f46b5a66SChristoph Hellwig kfree(vol_args); 491f46b5a66SChristoph Hellwig return ret; 492f46b5a66SChristoph Hellwig } 493f46b5a66SChristoph Hellwig 494cb8e7090SChristoph Hellwig static noinline int btrfs_ioctl_snap_create(struct file *file, 4953de4586cSChris Mason void __user *arg, int subvol) 496f46b5a66SChristoph Hellwig { 497cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 498f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 499f46b5a66SChristoph Hellwig struct btrfs_dir_item *di; 500f46b5a66SChristoph Hellwig struct btrfs_path *path; 5013de4586cSChris Mason struct file *src_file; 502f46b5a66SChristoph Hellwig u64 root_dirid; 503f46b5a66SChristoph Hellwig int namelen; 5043de4586cSChris Mason int ret = 0; 505f46b5a66SChristoph Hellwig 506c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 507c146afadSYan Zheng return -EROFS; 508c146afadSYan Zheng 509f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 510f46b5a66SChristoph Hellwig 511f46b5a66SChristoph Hellwig if (!vol_args) 512f46b5a66SChristoph Hellwig return -ENOMEM; 513f46b5a66SChristoph Hellwig 514f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 515f46b5a66SChristoph Hellwig ret = -EFAULT; 516f46b5a66SChristoph Hellwig goto out; 517f46b5a66SChristoph Hellwig } 518f46b5a66SChristoph Hellwig 5195516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 520f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 521f46b5a66SChristoph Hellwig if (strchr(vol_args->name, '/')) { 522f46b5a66SChristoph Hellwig ret = -EINVAL; 523f46b5a66SChristoph Hellwig goto out; 524f46b5a66SChristoph Hellwig } 525f46b5a66SChristoph Hellwig 526f46b5a66SChristoph Hellwig path = btrfs_alloc_path(); 527f46b5a66SChristoph Hellwig if (!path) { 528f46b5a66SChristoph Hellwig ret = -ENOMEM; 529f46b5a66SChristoph Hellwig goto out; 530f46b5a66SChristoph Hellwig } 531f46b5a66SChristoph Hellwig 532f46b5a66SChristoph Hellwig root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, 533f46b5a66SChristoph Hellwig di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, 534f46b5a66SChristoph Hellwig path, root_dirid, 535f46b5a66SChristoph Hellwig vol_args->name, namelen, 0); 536f46b5a66SChristoph Hellwig btrfs_free_path(path); 537f46b5a66SChristoph Hellwig 538f46b5a66SChristoph Hellwig if (di && !IS_ERR(di)) { 539f46b5a66SChristoph Hellwig ret = -EEXIST; 540f46b5a66SChristoph Hellwig goto out; 541f46b5a66SChristoph Hellwig } 542f46b5a66SChristoph Hellwig 543f46b5a66SChristoph Hellwig if (IS_ERR(di)) { 544f46b5a66SChristoph Hellwig ret = PTR_ERR(di); 545f46b5a66SChristoph Hellwig goto out; 546f46b5a66SChristoph Hellwig } 547f46b5a66SChristoph Hellwig 5483de4586cSChris Mason if (subvol) { 549cb8e7090SChristoph Hellwig ret = btrfs_mksubvol(&file->f_path, vol_args->name, 550cb8e7090SChristoph Hellwig file->f_path.dentry->d_inode->i_mode, 5513de4586cSChris Mason namelen, NULL); 552cb8e7090SChristoph Hellwig } else { 5533de4586cSChris Mason struct inode *src_inode; 5543de4586cSChris Mason src_file = fget(vol_args->fd); 5553de4586cSChris Mason if (!src_file) { 5563de4586cSChris Mason ret = -EINVAL; 5573de4586cSChris Mason goto out; 5583de4586cSChris Mason } 5593de4586cSChris Mason 5603de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 5613de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 5623de4586cSChris Mason printk("btrfs: Snapshot src from another FS\n"); 5633de4586cSChris Mason ret = -EINVAL; 5643de4586cSChris Mason fput(src_file); 5653de4586cSChris Mason goto out; 5663de4586cSChris Mason } 5673de4586cSChris Mason ret = btrfs_mksubvol(&file->f_path, vol_args->name, 5683de4586cSChris Mason file->f_path.dentry->d_inode->i_mode, 5693de4586cSChris Mason namelen, BTRFS_I(src_inode)->root); 5703de4586cSChris Mason fput(src_file); 571cb8e7090SChristoph Hellwig } 572cb8e7090SChristoph Hellwig 573f46b5a66SChristoph Hellwig out: 574f46b5a66SChristoph Hellwig kfree(vol_args); 575f46b5a66SChristoph Hellwig return ret; 576f46b5a66SChristoph Hellwig } 577f46b5a66SChristoph Hellwig 578f46b5a66SChristoph Hellwig static int btrfs_ioctl_defrag(struct file *file) 579f46b5a66SChristoph Hellwig { 580f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 581f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 582c146afadSYan Zheng int ret; 583c146afadSYan Zheng 584c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 585c146afadSYan Zheng if (ret) 586c146afadSYan Zheng return ret; 587f46b5a66SChristoph Hellwig 588f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 589f46b5a66SChristoph Hellwig case S_IFDIR: 590f46b5a66SChristoph Hellwig btrfs_defrag_root(root, 0); 591f46b5a66SChristoph Hellwig btrfs_defrag_root(root->fs_info->extent_root, 0); 592f46b5a66SChristoph Hellwig break; 593f46b5a66SChristoph Hellwig case S_IFREG: 594f46b5a66SChristoph Hellwig btrfs_defrag_file(file); 595f46b5a66SChristoph Hellwig break; 596f46b5a66SChristoph Hellwig } 597f46b5a66SChristoph Hellwig 598f46b5a66SChristoph Hellwig return 0; 599f46b5a66SChristoph Hellwig } 600f46b5a66SChristoph Hellwig 601f46b5a66SChristoph Hellwig long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 602f46b5a66SChristoph Hellwig { 603f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 604f46b5a66SChristoph Hellwig int ret; 605f46b5a66SChristoph Hellwig 606f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 607f46b5a66SChristoph Hellwig 608f46b5a66SChristoph Hellwig if (!vol_args) 609f46b5a66SChristoph Hellwig return -ENOMEM; 610f46b5a66SChristoph Hellwig 611f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 612f46b5a66SChristoph Hellwig ret = -EFAULT; 613f46b5a66SChristoph Hellwig goto out; 614f46b5a66SChristoph Hellwig } 6155516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 616f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 617f46b5a66SChristoph Hellwig 618f46b5a66SChristoph Hellwig out: 619f46b5a66SChristoph Hellwig kfree(vol_args); 620f46b5a66SChristoph Hellwig return ret; 621f46b5a66SChristoph Hellwig } 622f46b5a66SChristoph Hellwig 623f46b5a66SChristoph Hellwig long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 624f46b5a66SChristoph Hellwig { 625f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 626f46b5a66SChristoph Hellwig int ret; 627f46b5a66SChristoph Hellwig 628c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 629c146afadSYan Zheng return -EROFS; 630c146afadSYan Zheng 631f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 632f46b5a66SChristoph Hellwig 633f46b5a66SChristoph Hellwig if (!vol_args) 634f46b5a66SChristoph Hellwig return -ENOMEM; 635f46b5a66SChristoph Hellwig 636f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 637f46b5a66SChristoph Hellwig ret = -EFAULT; 638f46b5a66SChristoph Hellwig goto out; 639f46b5a66SChristoph Hellwig } 6405516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 641f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 642f46b5a66SChristoph Hellwig 643f46b5a66SChristoph Hellwig out: 644f46b5a66SChristoph Hellwig kfree(vol_args); 645f46b5a66SChristoph Hellwig return ret; 646f46b5a66SChristoph Hellwig } 647f46b5a66SChristoph Hellwig 648c5c9cd4dSSage Weil long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off, 649c5c9cd4dSSage Weil u64 olen, u64 destoff) 650f46b5a66SChristoph Hellwig { 651f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 652f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 653f46b5a66SChristoph Hellwig struct file *src_file; 654f46b5a66SChristoph Hellwig struct inode *src; 655f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 656f46b5a66SChristoph Hellwig struct btrfs_path *path; 657f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 658ae01a0abSYan Zheng char *buf; 659ae01a0abSYan Zheng struct btrfs_key key; 660f46b5a66SChristoph Hellwig u32 nritems; 661f46b5a66SChristoph Hellwig int slot; 662ae01a0abSYan Zheng int ret; 663c5c9cd4dSSage Weil u64 len = olen; 664c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 665c5c9cd4dSSage Weil u64 hint_byte; 666f46b5a66SChristoph Hellwig 667c5c9cd4dSSage Weil /* 668c5c9cd4dSSage Weil * TODO: 669c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 670c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 671c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 672c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 673c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 674c5c9cd4dSSage Weil * they don't overlap)? 675c5c9cd4dSSage Weil */ 676c5c9cd4dSSage Weil 677c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 678c146afadSYan Zheng if (ret) 679c146afadSYan Zheng return ret; 680c146afadSYan Zheng 681c5c9cd4dSSage Weil src_file = fget(srcfd); 682f46b5a66SChristoph Hellwig if (!src_file) 683f46b5a66SChristoph Hellwig return -EBADF; 684f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 685f46b5a66SChristoph Hellwig 686c5c9cd4dSSage Weil ret = -EINVAL; 687c5c9cd4dSSage Weil if (src == inode) 688c5c9cd4dSSage Weil goto out_fput; 689c5c9cd4dSSage Weil 690ae01a0abSYan Zheng ret = -EISDIR; 691ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 692f46b5a66SChristoph Hellwig goto out_fput; 693f46b5a66SChristoph Hellwig 694ae01a0abSYan Zheng ret = -EXDEV; 695ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 696ae01a0abSYan Zheng goto out_fput; 697ae01a0abSYan Zheng 698ae01a0abSYan Zheng ret = -ENOMEM; 699ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 700ae01a0abSYan Zheng if (!buf) 701ae01a0abSYan Zheng goto out_fput; 702ae01a0abSYan Zheng 703ae01a0abSYan Zheng path = btrfs_alloc_path(); 704ae01a0abSYan Zheng if (!path) { 705ae01a0abSYan Zheng vfree(buf); 706ae01a0abSYan Zheng goto out_fput; 707ae01a0abSYan Zheng } 708ae01a0abSYan Zheng path->reada = 2; 709ae01a0abSYan Zheng 710f46b5a66SChristoph Hellwig if (inode < src) { 711f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 712f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 713f46b5a66SChristoph Hellwig } else { 714f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 715f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 716f46b5a66SChristoph Hellwig } 717f46b5a66SChristoph Hellwig 718c5c9cd4dSSage Weil /* determine range to clone */ 719c5c9cd4dSSage Weil ret = -EINVAL; 720c5c9cd4dSSage Weil if (off >= src->i_size || off + len > src->i_size) 721f46b5a66SChristoph Hellwig goto out_unlock; 722c5c9cd4dSSage Weil if (len == 0) 723c5c9cd4dSSage Weil olen = len = src->i_size - off; 724c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 725c5c9cd4dSSage Weil if (off + len == src->i_size) 726c5c9cd4dSSage Weil len = ((src->i_size + bs-1) & ~(bs-1)) 727c5c9cd4dSSage Weil - off; 728c5c9cd4dSSage Weil 729c5c9cd4dSSage Weil /* verify the end result is block aligned */ 730c5c9cd4dSSage Weil if ((off & (bs-1)) || 731c5c9cd4dSSage Weil ((off + len) & (bs-1))) 732c5c9cd4dSSage Weil goto out_unlock; 733c5c9cd4dSSage Weil 734c5c9cd4dSSage Weil printk("final src extent is %llu~%llu\n", off, len); 735c5c9cd4dSSage Weil printk("final dst extent is %llu~%llu\n", destoff, len); 736f46b5a66SChristoph Hellwig 737f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 738f46b5a66SChristoph Hellwig another, and lock file content */ 739f46b5a66SChristoph Hellwig while (1) { 74031840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 741c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 742c5c9cd4dSSage Weil ordered = btrfs_lookup_first_ordered_extent(inode, off+len); 743ae01a0abSYan Zheng if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) 744f46b5a66SChristoph Hellwig break; 745c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 746ae01a0abSYan Zheng if (ordered) 747ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 748c5c9cd4dSSage Weil btrfs_wait_ordered_range(src, off, off+len); 749f46b5a66SChristoph Hellwig } 750f46b5a66SChristoph Hellwig 751ae01a0abSYan Zheng trans = btrfs_start_transaction(root, 1); 752ae01a0abSYan Zheng BUG_ON(!trans); 753ae01a0abSYan Zheng 754c5c9cd4dSSage Weil /* punch hole in destination first */ 755c5c9cd4dSSage Weil btrfs_drop_extents(trans, root, inode, off, off+len, 0, &hint_byte); 756c5c9cd4dSSage Weil 757c5c9cd4dSSage Weil /* clone data */ 758f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 759ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 760ae01a0abSYan Zheng key.offset = 0; 761f46b5a66SChristoph Hellwig 762f46b5a66SChristoph Hellwig while (1) { 763f46b5a66SChristoph Hellwig /* 764f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 765f46b5a66SChristoph Hellwig * tree. 766f46b5a66SChristoph Hellwig */ 767f46b5a66SChristoph Hellwig ret = btrfs_search_slot(trans, root, &key, path, 0, 0); 768f46b5a66SChristoph Hellwig if (ret < 0) 769f46b5a66SChristoph Hellwig goto out; 770f46b5a66SChristoph Hellwig 771ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 772ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 773f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 774f46b5a66SChristoph Hellwig if (ret < 0) 775f46b5a66SChristoph Hellwig goto out; 776f46b5a66SChristoph Hellwig if (ret > 0) 777f46b5a66SChristoph Hellwig break; 778ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 779f46b5a66SChristoph Hellwig } 780f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 781f46b5a66SChristoph Hellwig slot = path->slots[0]; 782f46b5a66SChristoph Hellwig 783ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 784f46b5a66SChristoph Hellwig if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY || 785f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 786f46b5a66SChristoph Hellwig break; 787f46b5a66SChristoph Hellwig 788c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 789c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 790c5c9cd4dSSage Weil int type; 79131840ae1SZheng Yan u32 size; 79231840ae1SZheng Yan struct btrfs_key new_key; 793c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 794c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 795c5c9cd4dSSage Weil u8 comp; 79631840ae1SZheng Yan 79731840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 79831840ae1SZheng Yan read_extent_buffer(leaf, buf, 79931840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 80031840ae1SZheng Yan size); 801c5c9cd4dSSage Weil 802c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 803c5c9cd4dSSage Weil struct btrfs_file_extent_item); 804c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 805c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 806c5c9cd4dSSage Weil if (type == BTRFS_FILE_EXTENT_REG) { 807c5c9cd4dSSage Weil disko = btrfs_file_extent_disk_bytenr(leaf, extent); 808c5c9cd4dSSage Weil diskl = btrfs_file_extent_disk_num_bytes(leaf, extent); 809c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 810c5c9cd4dSSage Weil datal = btrfs_file_extent_num_bytes(leaf, extent); 811c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 812c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 813c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 814c5c9cd4dSSage Weil extent); 815c5c9cd4dSSage Weil } 81631840ae1SZheng Yan btrfs_release_path(root, path); 81731840ae1SZheng Yan 818c5c9cd4dSSage Weil if (key.offset + datal < off || 819c5c9cd4dSSage Weil key.offset >= off+len) 820c5c9cd4dSSage Weil goto next; 821c5c9cd4dSSage Weil 82231840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 82331840ae1SZheng Yan new_key.objectid = inode->i_ino; 824c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 825c5c9cd4dSSage Weil 826c5c9cd4dSSage Weil if (type == BTRFS_FILE_EXTENT_REG) { 82731840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 82831840ae1SZheng Yan &new_key, size); 82931840ae1SZheng Yan if (ret) 83031840ae1SZheng Yan goto out; 83131840ae1SZheng Yan 83231840ae1SZheng Yan leaf = path->nodes[0]; 83331840ae1SZheng Yan slot = path->slots[0]; 83431840ae1SZheng Yan write_extent_buffer(leaf, buf, 83531840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 83631840ae1SZheng Yan size); 837ae01a0abSYan Zheng 838f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 839f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 840c5c9cd4dSSage Weil printk(" orig disk %llu~%llu data %llu~%llu\n", 841c5c9cd4dSSage Weil disko, diskl, datao, datal); 842c5c9cd4dSSage Weil 843c5c9cd4dSSage Weil if (off > key.offset) { 844c5c9cd4dSSage Weil datao += off - key.offset; 845c5c9cd4dSSage Weil datal -= off - key.offset; 846c5c9cd4dSSage Weil } 847c5c9cd4dSSage Weil if (key.offset + datao + datal + key.offset > 848c5c9cd4dSSage Weil off + len) 849c5c9cd4dSSage Weil datal = off + len - key.offset - datao; 850c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 851c5c9cd4dSSage Weil if (!disko) 852c5c9cd4dSSage Weil datao = 0; 853c5c9cd4dSSage Weil printk(" final disk %llu~%llu data %llu~%llu\n", 854c5c9cd4dSSage Weil disko, diskl, datao, datal); 855c5c9cd4dSSage Weil 856c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 857c5c9cd4dSSage Weil datao); 858c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 859c5c9cd4dSSage Weil datal); 860c5c9cd4dSSage Weil if (disko) { 861c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 862ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 863c5c9cd4dSSage Weil disko, diskl, leaf->start, 864f46b5a66SChristoph Hellwig root->root_key.objectid, 865f46b5a66SChristoph Hellwig trans->transid, 8663bb1a1bcSYan Zheng inode->i_ino); 867ae01a0abSYan Zheng BUG_ON(ret); 868f46b5a66SChristoph Hellwig } 869c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 870c5c9cd4dSSage Weil u64 skip = 0; 871c5c9cd4dSSage Weil u64 trim = 0; 872c5c9cd4dSSage Weil if (off > key.offset) { 873c5c9cd4dSSage Weil skip = off - key.offset; 874c5c9cd4dSSage Weil new_key.offset += skip; 87531840ae1SZheng Yan } 876c5c9cd4dSSage Weil if (key.offset + datal > off+len) 877c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 878c5c9cd4dSSage Weil printk("len %lld skip %lld trim %lld\n", 879c5c9cd4dSSage Weil datal, skip, trim); 880c5c9cd4dSSage Weil if (comp && (skip || trim)) { 881c5c9cd4dSSage Weil printk("btrfs clone_range can't split compressed inline extents yet\n"); 882c5c9cd4dSSage Weil ret = -EINVAL; 883c5c9cd4dSSage Weil goto out; 88431840ae1SZheng Yan } 885c5c9cd4dSSage Weil size -= skip + trim; 886c5c9cd4dSSage Weil datal -= skip + trim; 887c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 888c5c9cd4dSSage Weil &new_key, size); 889c5c9cd4dSSage Weil if (ret) 890c5c9cd4dSSage Weil goto out; 891c5c9cd4dSSage Weil 892c5c9cd4dSSage Weil if (skip) { 893c5c9cd4dSSage Weil u32 start = btrfs_file_extent_calc_inline_size(0); 894c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 895c5c9cd4dSSage Weil datal); 896c5c9cd4dSSage Weil } 897c5c9cd4dSSage Weil 898c5c9cd4dSSage Weil leaf = path->nodes[0]; 899c5c9cd4dSSage Weil slot = path->slots[0]; 900c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 901c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 902c5c9cd4dSSage Weil size); 903c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 904c5c9cd4dSSage Weil } 905c5c9cd4dSSage Weil 906c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 907c5c9cd4dSSage Weil } 908c5c9cd4dSSage Weil 909c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) { 910c5c9cd4dSSage Weil u32 size; 911c5c9cd4dSSage Weil struct btrfs_key new_key; 912c5c9cd4dSSage Weil u64 coverslen; 913c5c9cd4dSSage Weil int coff, clen; 914c5c9cd4dSSage Weil 915c5c9cd4dSSage Weil size = btrfs_item_size_nr(leaf, slot); 916c5c9cd4dSSage Weil coverslen = (size / BTRFS_CRC32_SIZE) << 917c5c9cd4dSSage Weil root->fs_info->sb->s_blocksize_bits; 918c5c9cd4dSSage Weil printk("csums for %llu~%llu\n", 919c5c9cd4dSSage Weil key.offset, coverslen); 920c5c9cd4dSSage Weil if (key.offset + coverslen < off || 921c5c9cd4dSSage Weil key.offset >= off+len) 922c5c9cd4dSSage Weil goto next; 923c5c9cd4dSSage Weil 924c5c9cd4dSSage Weil read_extent_buffer(leaf, buf, 925c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 926c5c9cd4dSSage Weil size); 927c5c9cd4dSSage Weil btrfs_release_path(root, path); 928c5c9cd4dSSage Weil 929c5c9cd4dSSage Weil coff = 0; 930c5c9cd4dSSage Weil if (off > key.offset) 931c5c9cd4dSSage Weil coff = ((off - key.offset) >> 932c5c9cd4dSSage Weil root->fs_info->sb->s_blocksize_bits) * 933c5c9cd4dSSage Weil BTRFS_CRC32_SIZE; 934c5c9cd4dSSage Weil clen = size - coff; 935c5c9cd4dSSage Weil if (key.offset + coverslen > off+len) 936c5c9cd4dSSage Weil clen -= ((key.offset+coverslen-off-len) >> 937c5c9cd4dSSage Weil root->fs_info->sb->s_blocksize_bits) * 938c5c9cd4dSSage Weil BTRFS_CRC32_SIZE; 939c5c9cd4dSSage Weil printk(" will dup %d~%d of %d\n", 940c5c9cd4dSSage Weil coff, clen, size); 941c5c9cd4dSSage Weil 942c5c9cd4dSSage Weil memcpy(&new_key, &key, sizeof(new_key)); 943c5c9cd4dSSage Weil new_key.objectid = inode->i_ino; 944c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 945c5c9cd4dSSage Weil 946c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 947c5c9cd4dSSage Weil &new_key, clen); 948c5c9cd4dSSage Weil if (ret) 949c5c9cd4dSSage Weil goto out; 950c5c9cd4dSSage Weil 951c5c9cd4dSSage Weil leaf = path->nodes[0]; 952c5c9cd4dSSage Weil slot = path->slots[0]; 953c5c9cd4dSSage Weil write_extent_buffer(leaf, buf + coff, 954c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 955c5c9cd4dSSage Weil clen); 956c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 957c5c9cd4dSSage Weil } 958c5c9cd4dSSage Weil 959c5c9cd4dSSage Weil next: 96031840ae1SZheng Yan btrfs_release_path(root, path); 961ae01a0abSYan Zheng key.offset++; 962ae01a0abSYan Zheng } 963f46b5a66SChristoph Hellwig ret = 0; 964f46b5a66SChristoph Hellwig out: 965ae01a0abSYan Zheng btrfs_release_path(root, path); 966ae01a0abSYan Zheng if (ret == 0) { 967ae01a0abSYan Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 968c5c9cd4dSSage Weil if (destoff + olen > inode->i_size) 969c5c9cd4dSSage Weil btrfs_i_size_write(inode, destoff + olen); 970ae01a0abSYan Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 971ae01a0abSYan Zheng ret = btrfs_update_inode(trans, root, inode); 972ae01a0abSYan Zheng } 973f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 974c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 975ae01a0abSYan Zheng if (ret) 976ae01a0abSYan Zheng vmtruncate(inode, 0); 977f46b5a66SChristoph Hellwig out_unlock: 978f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 979f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 980ae01a0abSYan Zheng vfree(buf); 981ae01a0abSYan Zheng btrfs_free_path(path); 982f46b5a66SChristoph Hellwig out_fput: 983f46b5a66SChristoph Hellwig fput(src_file); 984f46b5a66SChristoph Hellwig return ret; 985f46b5a66SChristoph Hellwig } 986f46b5a66SChristoph Hellwig 987c5c9cd4dSSage Weil long btrfs_ioctl_clone_range(struct file *file, unsigned long argptr) 988c5c9cd4dSSage Weil { 989c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 990c5c9cd4dSSage Weil 991c5c9cd4dSSage Weil if (copy_from_user(&args, (void *)argptr, sizeof(args))) 992c5c9cd4dSSage Weil return -EFAULT; 993c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 994c5c9cd4dSSage Weil args.src_length, args.dest_offset); 995c5c9cd4dSSage Weil } 996c5c9cd4dSSage Weil 997f46b5a66SChristoph Hellwig /* 998f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 999f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1000f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1001f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1002f46b5a66SChristoph Hellwig */ 1003f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_start(struct file *file) 1004f46b5a66SChristoph Hellwig { 1005f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1006f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1007f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1008f46b5a66SChristoph Hellwig int ret = 0; 1009f46b5a66SChristoph Hellwig 1010df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 1011df5b5520SChristoph Hellwig return -EPERM; 1012df5b5520SChristoph Hellwig 1013f46b5a66SChristoph Hellwig if (file->private_data) { 1014f46b5a66SChristoph Hellwig ret = -EINPROGRESS; 1015f46b5a66SChristoph Hellwig goto out; 1016f46b5a66SChristoph Hellwig } 10179ca9ee09SSage Weil 1018c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1019c146afadSYan Zheng if (ret) 1020c146afadSYan Zheng goto out; 1021c146afadSYan Zheng 10229ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 10239ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 10249ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 10259ca9ee09SSage Weil 10269ca9ee09SSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 1027f46b5a66SChristoph Hellwig if (trans) 1028f46b5a66SChristoph Hellwig file->private_data = trans; 1029f46b5a66SChristoph Hellwig else 1030f46b5a66SChristoph Hellwig ret = -ENOMEM; 1031f46b5a66SChristoph Hellwig /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/ 1032f46b5a66SChristoph Hellwig out: 1033f46b5a66SChristoph Hellwig return ret; 1034f46b5a66SChristoph Hellwig } 1035f46b5a66SChristoph Hellwig 1036f46b5a66SChristoph Hellwig /* 1037f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1038f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1039f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1040f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1041f46b5a66SChristoph Hellwig */ 1042f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 1043f46b5a66SChristoph Hellwig { 1044f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1045f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1046f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1047f46b5a66SChristoph Hellwig int ret = 0; 1048f46b5a66SChristoph Hellwig 1049f46b5a66SChristoph Hellwig trans = file->private_data; 1050f46b5a66SChristoph Hellwig if (!trans) { 1051f46b5a66SChristoph Hellwig ret = -EINVAL; 1052f46b5a66SChristoph Hellwig goto out; 1053f46b5a66SChristoph Hellwig } 1054f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 1055b214107eSChristoph Hellwig file->private_data = NULL; 10569ca9ee09SSage Weil 10579ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 10589ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 10599ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 10609ca9ee09SSage Weil 1061f46b5a66SChristoph Hellwig out: 1062f46b5a66SChristoph Hellwig return ret; 1063f46b5a66SChristoph Hellwig } 1064f46b5a66SChristoph Hellwig 1065f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 1066f46b5a66SChristoph Hellwig cmd, unsigned long arg) 1067f46b5a66SChristoph Hellwig { 1068f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 1069f46b5a66SChristoph Hellwig 1070f46b5a66SChristoph Hellwig switch (cmd) { 1071f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 10723de4586cSChris Mason return btrfs_ioctl_snap_create(file, (void __user *)arg, 0); 10733de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 10743de4586cSChris Mason return btrfs_ioctl_snap_create(file, (void __user *)arg, 1); 1075f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 1076f46b5a66SChristoph Hellwig return btrfs_ioctl_defrag(file); 1077f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 1078f46b5a66SChristoph Hellwig return btrfs_ioctl_resize(root, (void __user *)arg); 1079f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 1080f46b5a66SChristoph Hellwig return btrfs_ioctl_add_dev(root, (void __user *)arg); 1081f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 1082f46b5a66SChristoph Hellwig return btrfs_ioctl_rm_dev(root, (void __user *)arg); 1083f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 1084f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 1085f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 1086c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 1087c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 1088c5c9cd4dSSage Weil return btrfs_ioctl_clone_range(file, arg); 1089f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 1090f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 1091f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 1092f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 1093f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 1094ea8c2819SChris Mason btrfs_start_delalloc_inodes(root); 1095f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 1096f46b5a66SChristoph Hellwig return 0; 1097f46b5a66SChristoph Hellwig } 1098f46b5a66SChristoph Hellwig 1099f46b5a66SChristoph Hellwig return -ENOTTY; 1100f46b5a66SChristoph Hellwig } 1101