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); 1303de4586cSChris Mason printk("inserting root objectid %Lu\n", objectid); 131f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 132f46b5a66SChristoph Hellwig &root_item); 133f46b5a66SChristoph Hellwig if (ret) 134f46b5a66SChristoph Hellwig goto fail; 135f46b5a66SChristoph Hellwig 136f46b5a66SChristoph Hellwig /* 137f46b5a66SChristoph Hellwig * insert the directory item 138f46b5a66SChristoph Hellwig */ 139f46b5a66SChristoph Hellwig key.offset = (u64)-1; 1403de4586cSChris Mason dir = dentry->d_parent->d_inode; 1413de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 1423de4586cSChris Mason BUG_ON(ret); 1433de4586cSChris Mason 1443de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 145f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 1463de4586cSChris Mason BTRFS_FT_DIR, index); 147f46b5a66SChristoph Hellwig if (ret) 148f46b5a66SChristoph Hellwig goto fail; 1493de4586cSChris Mason #if 0 150f46b5a66SChristoph Hellwig ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, 151f46b5a66SChristoph Hellwig name, namelen, objectid, 152aec7477bSJosef Bacik root->fs_info->sb->s_root->d_inode->i_ino, 0); 153f46b5a66SChristoph Hellwig if (ret) 154f46b5a66SChristoph Hellwig goto fail; 1553de4586cSChris Mason #endif 156f46b5a66SChristoph Hellwig ret = btrfs_commit_transaction(trans, root); 157f46b5a66SChristoph Hellwig if (ret) 158f46b5a66SChristoph Hellwig goto fail_commit; 159f46b5a66SChristoph Hellwig 1603de4586cSChris Mason new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 161f46b5a66SChristoph Hellwig BUG_ON(!new_root); 162f46b5a66SChristoph Hellwig 163f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(new_root, 1); 164f46b5a66SChristoph Hellwig BUG_ON(!trans); 165f46b5a66SChristoph Hellwig 166cb8e7090SChristoph Hellwig ret = btrfs_create_subvol_root(new_root, dentry, trans, new_dirid, 167f46b5a66SChristoph Hellwig BTRFS_I(dir)->block_group); 168f46b5a66SChristoph Hellwig if (ret) 169f46b5a66SChristoph Hellwig goto fail; 170f46b5a66SChristoph Hellwig 171f46b5a66SChristoph Hellwig fail: 172f46b5a66SChristoph Hellwig nr = trans->blocks_used; 173f46b5a66SChristoph Hellwig err = btrfs_commit_transaction(trans, new_root); 174f46b5a66SChristoph Hellwig if (err && !ret) 175f46b5a66SChristoph Hellwig ret = err; 176f46b5a66SChristoph Hellwig fail_commit: 177f46b5a66SChristoph Hellwig btrfs_btree_balance_dirty(root, nr); 1783de4586cSChris Mason printk("all done ret %d\n", ret); 179f46b5a66SChristoph Hellwig return ret; 180f46b5a66SChristoph Hellwig } 181f46b5a66SChristoph Hellwig 1823de4586cSChris Mason static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 1833de4586cSChris Mason char *name, int namelen) 184f46b5a66SChristoph Hellwig { 185f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 186f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1873de4586cSChris Mason int ret = 0; 188f46b5a66SChristoph Hellwig int err; 189f46b5a66SChristoph Hellwig unsigned long nr = 0; 190f46b5a66SChristoph Hellwig 191f46b5a66SChristoph Hellwig if (!root->ref_cows) 192f46b5a66SChristoph Hellwig return -EINVAL; 193f46b5a66SChristoph Hellwig 194f46b5a66SChristoph Hellwig ret = btrfs_check_free_space(root, 1, 0); 195f46b5a66SChristoph Hellwig if (ret) 196f46b5a66SChristoph Hellwig goto fail_unlock; 197f46b5a66SChristoph Hellwig 1983de4586cSChris Mason pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 199f46b5a66SChristoph Hellwig if (!pending_snapshot) { 200f46b5a66SChristoph Hellwig ret = -ENOMEM; 201f46b5a66SChristoph Hellwig goto fail_unlock; 202f46b5a66SChristoph Hellwig } 203f46b5a66SChristoph Hellwig pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); 204f46b5a66SChristoph Hellwig if (!pending_snapshot->name) { 205f46b5a66SChristoph Hellwig ret = -ENOMEM; 206f46b5a66SChristoph Hellwig kfree(pending_snapshot); 207f46b5a66SChristoph Hellwig goto fail_unlock; 208f46b5a66SChristoph Hellwig } 209f46b5a66SChristoph Hellwig memcpy(pending_snapshot->name, name, namelen); 210f46b5a66SChristoph Hellwig pending_snapshot->name[namelen] = '\0'; 2113de4586cSChris Mason pending_snapshot->dentry = dentry; 212f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 213f46b5a66SChristoph Hellwig BUG_ON(!trans); 214f46b5a66SChristoph Hellwig pending_snapshot->root = root; 215f46b5a66SChristoph Hellwig list_add(&pending_snapshot->list, 216f46b5a66SChristoph Hellwig &trans->transaction->pending_snapshots); 217f46b5a66SChristoph Hellwig err = btrfs_commit_transaction(trans, root); 218f46b5a66SChristoph Hellwig 219f46b5a66SChristoph Hellwig fail_unlock: 220f46b5a66SChristoph Hellwig btrfs_btree_balance_dirty(root, nr); 221f46b5a66SChristoph Hellwig return ret; 222f46b5a66SChristoph Hellwig } 223f46b5a66SChristoph Hellwig 224cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 225cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 226cb8e7090SChristoph Hellwig { 227cb8e7090SChristoph Hellwig if (child->d_inode) 228cb8e7090SChristoph Hellwig return -EEXIST; 229cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 230cb8e7090SChristoph Hellwig return -ENOENT; 231cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 232cb8e7090SChristoph Hellwig } 233cb8e7090SChristoph Hellwig 234cb8e7090SChristoph Hellwig /* 235cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 236cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 237cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 238cb8e7090SChristoph Hellwig */ 239cb8e7090SChristoph Hellwig static noinline int btrfs_mksubvol(struct path *parent, char *name, 2403de4586cSChris Mason int mode, int namelen, 2413de4586cSChris Mason struct btrfs_root *snap_src) 242cb8e7090SChristoph Hellwig { 243cb8e7090SChristoph Hellwig struct dentry *dentry; 244cb8e7090SChristoph Hellwig int error; 245cb8e7090SChristoph Hellwig 246cb8e7090SChristoph Hellwig mutex_lock_nested(&parent->dentry->d_inode->i_mutex, I_MUTEX_PARENT); 247cb8e7090SChristoph Hellwig 248cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 249cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 250cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 251cb8e7090SChristoph Hellwig goto out_unlock; 252cb8e7090SChristoph Hellwig 253cb8e7090SChristoph Hellwig error = -EEXIST; 254cb8e7090SChristoph Hellwig if (dentry->d_inode) 255cb8e7090SChristoph Hellwig goto out_dput; 256cb8e7090SChristoph Hellwig 257cb8e7090SChristoph Hellwig if (!IS_POSIXACL(parent->dentry->d_inode)) 258cb8e7090SChristoph Hellwig mode &= ~current->fs->umask; 2593de4586cSChris Mason 260cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 261cb8e7090SChristoph Hellwig if (error) 262cb8e7090SChristoph Hellwig goto out_dput; 263cb8e7090SChristoph Hellwig 264cb8e7090SChristoph Hellwig error = btrfs_may_create(parent->dentry->d_inode, dentry); 265cb8e7090SChristoph Hellwig if (error) 266cb8e7090SChristoph Hellwig goto out_drop_write; 267cb8e7090SChristoph Hellwig 268cb8e7090SChristoph Hellwig /* 269cb8e7090SChristoph Hellwig * Actually perform the low-level subvolume creation after all 270cb8e7090SChristoph Hellwig * this VFS fuzz. 271cb8e7090SChristoph Hellwig * 272cb8e7090SChristoph Hellwig * Eventually we want to pass in an inode under which we create this 273cb8e7090SChristoph Hellwig * subvolume, but for now all are under the filesystem root. 274cb8e7090SChristoph Hellwig * 275cb8e7090SChristoph Hellwig * Also we should pass on the mode eventually to allow creating new 276cb8e7090SChristoph Hellwig * subvolume with specific mode bits. 277cb8e7090SChristoph Hellwig */ 2783de4586cSChris Mason if (snap_src) { 2793de4586cSChris Mason error = create_snapshot(snap_src, dentry, name, namelen); 2803de4586cSChris Mason } else { 2813de4586cSChris Mason error = create_subvol(BTRFS_I(parent->dentry->d_inode)->root, 2823de4586cSChris Mason dentry, name, namelen); 2833de4586cSChris Mason } 284cb8e7090SChristoph Hellwig if (error) 285cb8e7090SChristoph Hellwig goto out_drop_write; 286cb8e7090SChristoph Hellwig 287cb8e7090SChristoph Hellwig fsnotify_mkdir(parent->dentry->d_inode, dentry); 288cb8e7090SChristoph Hellwig out_drop_write: 289cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 290cb8e7090SChristoph Hellwig out_dput: 291cb8e7090SChristoph Hellwig dput(dentry); 292cb8e7090SChristoph Hellwig out_unlock: 293cb8e7090SChristoph Hellwig mutex_unlock(&parent->dentry->d_inode->i_mutex); 294cb8e7090SChristoph Hellwig return error; 295cb8e7090SChristoph Hellwig } 296cb8e7090SChristoph Hellwig 297cb8e7090SChristoph Hellwig 298f46b5a66SChristoph Hellwig int btrfs_defrag_file(struct file *file) 299f46b5a66SChristoph Hellwig { 300f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 301f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 302f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 3033eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 304f46b5a66SChristoph Hellwig struct page *page; 305f46b5a66SChristoph Hellwig unsigned long last_index; 306f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 307f46b5a66SChristoph Hellwig unsigned long total_read = 0; 308f46b5a66SChristoph Hellwig u64 page_start; 309f46b5a66SChristoph Hellwig u64 page_end; 310f46b5a66SChristoph Hellwig unsigned long i; 311f46b5a66SChristoph Hellwig int ret; 312f46b5a66SChristoph Hellwig 313f46b5a66SChristoph Hellwig ret = btrfs_check_free_space(root, inode->i_size, 0); 314f46b5a66SChristoph Hellwig if (ret) 315f46b5a66SChristoph Hellwig return -ENOSPC; 316f46b5a66SChristoph Hellwig 317f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 318f46b5a66SChristoph Hellwig last_index = inode->i_size >> PAGE_CACHE_SHIFT; 319f46b5a66SChristoph Hellwig for (i = 0; i <= last_index; i++) { 320f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 321f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 322f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 323f46b5a66SChristoph Hellwig } 324f46b5a66SChristoph Hellwig total_read++; 3253eaa2885SChris Mason again: 326f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 327f46b5a66SChristoph Hellwig if (!page) 328f46b5a66SChristoph Hellwig goto out_unlock; 329f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 330f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 331f46b5a66SChristoph Hellwig lock_page(page); 332f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 333f46b5a66SChristoph Hellwig unlock_page(page); 334f46b5a66SChristoph Hellwig page_cache_release(page); 335f46b5a66SChristoph Hellwig goto out_unlock; 336f46b5a66SChristoph Hellwig } 337f46b5a66SChristoph Hellwig } 338f46b5a66SChristoph Hellwig 339f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 340f46b5a66SChristoph Hellwig 341f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 342f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 343f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 3443eaa2885SChris Mason 3453eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 3463eaa2885SChris Mason if (ordered) { 3473eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 3483eaa2885SChris Mason unlock_page(page); 3493eaa2885SChris Mason page_cache_release(page); 3503eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 3513eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 3523eaa2885SChris Mason goto again; 3533eaa2885SChris Mason } 3543eaa2885SChris Mason set_page_extent_mapped(page); 3553eaa2885SChris Mason 356f87f057bSChris Mason /* 357f87f057bSChris Mason * this makes sure page_mkwrite is called on the 358f87f057bSChris Mason * page if it is dirtied again later 359f87f057bSChris Mason */ 360f87f057bSChris Mason clear_page_dirty_for_io(page); 361f87f057bSChris Mason 362ea8c2819SChris Mason btrfs_set_extent_delalloc(inode, page_start, page_end); 363f46b5a66SChristoph Hellwig 364f46b5a66SChristoph Hellwig unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 365f46b5a66SChristoph Hellwig set_page_dirty(page); 366f46b5a66SChristoph Hellwig unlock_page(page); 367f46b5a66SChristoph Hellwig page_cache_release(page); 368f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 369f46b5a66SChristoph Hellwig } 370f46b5a66SChristoph Hellwig 371f46b5a66SChristoph Hellwig out_unlock: 372f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 373f46b5a66SChristoph Hellwig return 0; 374f46b5a66SChristoph Hellwig } 375f46b5a66SChristoph Hellwig 376f46b5a66SChristoph Hellwig /* 377f46b5a66SChristoph Hellwig * Called inside transaction, so use GFP_NOFS 378f46b5a66SChristoph Hellwig */ 379f46b5a66SChristoph Hellwig 380f46b5a66SChristoph Hellwig static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) 381f46b5a66SChristoph Hellwig { 382f46b5a66SChristoph Hellwig u64 new_size; 383f46b5a66SChristoph Hellwig u64 old_size; 384f46b5a66SChristoph Hellwig u64 devid = 1; 385f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 386f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 387f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 388f46b5a66SChristoph Hellwig char *sizestr; 389f46b5a66SChristoph Hellwig char *devstr = NULL; 390f46b5a66SChristoph Hellwig int ret = 0; 391f46b5a66SChristoph Hellwig int namelen; 392f46b5a66SChristoph Hellwig int mod = 0; 393f46b5a66SChristoph Hellwig 394c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 395c146afadSYan Zheng return -EROFS; 396c146afadSYan Zheng 397f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 398f46b5a66SChristoph Hellwig 399f46b5a66SChristoph Hellwig if (!vol_args) 400f46b5a66SChristoph Hellwig return -ENOMEM; 401f46b5a66SChristoph Hellwig 402f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 403f46b5a66SChristoph Hellwig ret = -EFAULT; 404f46b5a66SChristoph Hellwig goto out; 405f46b5a66SChristoph Hellwig } 4065516e595SMark Fasheh 4075516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 408f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 409f46b5a66SChristoph Hellwig 4107d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 411f46b5a66SChristoph Hellwig sizestr = vol_args->name; 412f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 413f46b5a66SChristoph Hellwig if (devstr) { 414f46b5a66SChristoph Hellwig char *end; 415f46b5a66SChristoph Hellwig sizestr = devstr + 1; 416f46b5a66SChristoph Hellwig *devstr = '\0'; 417f46b5a66SChristoph Hellwig devstr = vol_args->name; 418f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 419f46b5a66SChristoph Hellwig printk(KERN_INFO "resizing devid %llu\n", devid); 420f46b5a66SChristoph Hellwig } 4212b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 422f46b5a66SChristoph Hellwig if (!device) { 423f46b5a66SChristoph Hellwig printk(KERN_INFO "resizer unable to find device %llu\n", devid); 424f46b5a66SChristoph Hellwig ret = -EINVAL; 425f46b5a66SChristoph Hellwig goto out_unlock; 426f46b5a66SChristoph Hellwig } 427f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 428f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 429f46b5a66SChristoph Hellwig else { 430f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 431f46b5a66SChristoph Hellwig mod = -1; 432f46b5a66SChristoph Hellwig sizestr++; 433f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 434f46b5a66SChristoph Hellwig mod = 1; 435f46b5a66SChristoph Hellwig sizestr++; 436f46b5a66SChristoph Hellwig } 437f46b5a66SChristoph Hellwig new_size = btrfs_parse_size(sizestr); 438f46b5a66SChristoph Hellwig if (new_size == 0) { 439f46b5a66SChristoph Hellwig ret = -EINVAL; 440f46b5a66SChristoph Hellwig goto out_unlock; 441f46b5a66SChristoph Hellwig } 442f46b5a66SChristoph Hellwig } 443f46b5a66SChristoph Hellwig 444f46b5a66SChristoph Hellwig old_size = device->total_bytes; 445f46b5a66SChristoph Hellwig 446f46b5a66SChristoph Hellwig if (mod < 0) { 447f46b5a66SChristoph Hellwig if (new_size > old_size) { 448f46b5a66SChristoph Hellwig ret = -EINVAL; 449f46b5a66SChristoph Hellwig goto out_unlock; 450f46b5a66SChristoph Hellwig } 451f46b5a66SChristoph Hellwig new_size = old_size - new_size; 452f46b5a66SChristoph Hellwig } else if (mod > 0) { 453f46b5a66SChristoph Hellwig new_size = old_size + new_size; 454f46b5a66SChristoph Hellwig } 455f46b5a66SChristoph Hellwig 456f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 457f46b5a66SChristoph Hellwig ret = -EINVAL; 458f46b5a66SChristoph Hellwig goto out_unlock; 459f46b5a66SChristoph Hellwig } 460f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 461f46b5a66SChristoph Hellwig ret = -EFBIG; 462f46b5a66SChristoph Hellwig goto out_unlock; 463f46b5a66SChristoph Hellwig } 464f46b5a66SChristoph Hellwig 465f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 466f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 467f46b5a66SChristoph Hellwig 468f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 469f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 470f46b5a66SChristoph Hellwig 471f46b5a66SChristoph Hellwig if (new_size > old_size) { 472f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 473f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 474f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 475f46b5a66SChristoph Hellwig } else { 476f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 477f46b5a66SChristoph Hellwig } 478f46b5a66SChristoph Hellwig 479f46b5a66SChristoph Hellwig out_unlock: 4807d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 481f46b5a66SChristoph Hellwig out: 482f46b5a66SChristoph Hellwig kfree(vol_args); 483f46b5a66SChristoph Hellwig return ret; 484f46b5a66SChristoph Hellwig } 485f46b5a66SChristoph Hellwig 486cb8e7090SChristoph Hellwig static noinline int btrfs_ioctl_snap_create(struct file *file, 4873de4586cSChris Mason void __user *arg, int subvol) 488f46b5a66SChristoph Hellwig { 489cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 490f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 491f46b5a66SChristoph Hellwig struct btrfs_dir_item *di; 492f46b5a66SChristoph Hellwig struct btrfs_path *path; 4933de4586cSChris Mason struct file *src_file; 494f46b5a66SChristoph Hellwig u64 root_dirid; 495f46b5a66SChristoph Hellwig int namelen; 4963de4586cSChris Mason int ret = 0; 497f46b5a66SChristoph Hellwig 498c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 499c146afadSYan Zheng return -EROFS; 500c146afadSYan Zheng 501f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 502f46b5a66SChristoph Hellwig 503f46b5a66SChristoph Hellwig if (!vol_args) 504f46b5a66SChristoph Hellwig return -ENOMEM; 505f46b5a66SChristoph Hellwig 506f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 507f46b5a66SChristoph Hellwig ret = -EFAULT; 508f46b5a66SChristoph Hellwig goto out; 509f46b5a66SChristoph Hellwig } 510f46b5a66SChristoph Hellwig 5115516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 512f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 513f46b5a66SChristoph Hellwig if (strchr(vol_args->name, '/')) { 514f46b5a66SChristoph Hellwig ret = -EINVAL; 515f46b5a66SChristoph Hellwig goto out; 516f46b5a66SChristoph Hellwig } 517f46b5a66SChristoph Hellwig 518f46b5a66SChristoph Hellwig path = btrfs_alloc_path(); 519f46b5a66SChristoph Hellwig if (!path) { 520f46b5a66SChristoph Hellwig ret = -ENOMEM; 521f46b5a66SChristoph Hellwig goto out; 522f46b5a66SChristoph Hellwig } 523f46b5a66SChristoph Hellwig 524f46b5a66SChristoph Hellwig root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, 525f46b5a66SChristoph Hellwig di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, 526f46b5a66SChristoph Hellwig path, root_dirid, 527f46b5a66SChristoph Hellwig vol_args->name, namelen, 0); 528f46b5a66SChristoph Hellwig btrfs_free_path(path); 529f46b5a66SChristoph Hellwig 530f46b5a66SChristoph Hellwig if (di && !IS_ERR(di)) { 531f46b5a66SChristoph Hellwig ret = -EEXIST; 532f46b5a66SChristoph Hellwig goto out; 533f46b5a66SChristoph Hellwig } 534f46b5a66SChristoph Hellwig 535f46b5a66SChristoph Hellwig if (IS_ERR(di)) { 536f46b5a66SChristoph Hellwig ret = PTR_ERR(di); 537f46b5a66SChristoph Hellwig goto out; 538f46b5a66SChristoph Hellwig } 539f46b5a66SChristoph Hellwig 5403de4586cSChris Mason if (subvol) { 541cb8e7090SChristoph Hellwig ret = btrfs_mksubvol(&file->f_path, vol_args->name, 542cb8e7090SChristoph Hellwig file->f_path.dentry->d_inode->i_mode, 5433de4586cSChris Mason namelen, NULL); 544cb8e7090SChristoph Hellwig } else { 5453de4586cSChris Mason struct inode *src_inode; 5463de4586cSChris Mason src_file = fget(vol_args->fd); 5473de4586cSChris Mason if (!src_file) { 5483de4586cSChris Mason ret = -EINVAL; 5493de4586cSChris Mason goto out; 5503de4586cSChris Mason } 5513de4586cSChris Mason 5523de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 5533de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 5543de4586cSChris Mason printk("btrfs: Snapshot src from another FS\n"); 5553de4586cSChris Mason ret = -EINVAL; 5563de4586cSChris Mason fput(src_file); 5573de4586cSChris Mason goto out; 5583de4586cSChris Mason } 5593de4586cSChris Mason ret = btrfs_mksubvol(&file->f_path, vol_args->name, 5603de4586cSChris Mason file->f_path.dentry->d_inode->i_mode, 5613de4586cSChris Mason namelen, BTRFS_I(src_inode)->root); 5623de4586cSChris Mason fput(src_file); 563cb8e7090SChristoph Hellwig } 564cb8e7090SChristoph Hellwig 565f46b5a66SChristoph Hellwig out: 566f46b5a66SChristoph Hellwig kfree(vol_args); 567f46b5a66SChristoph Hellwig return ret; 568f46b5a66SChristoph Hellwig } 569f46b5a66SChristoph Hellwig 570f46b5a66SChristoph Hellwig static int btrfs_ioctl_defrag(struct file *file) 571f46b5a66SChristoph Hellwig { 572f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 573f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 574c146afadSYan Zheng int ret; 575c146afadSYan Zheng 576c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 577c146afadSYan Zheng if (ret) 578c146afadSYan Zheng return ret; 579f46b5a66SChristoph Hellwig 580f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 581f46b5a66SChristoph Hellwig case S_IFDIR: 582f46b5a66SChristoph Hellwig btrfs_defrag_root(root, 0); 583f46b5a66SChristoph Hellwig btrfs_defrag_root(root->fs_info->extent_root, 0); 584f46b5a66SChristoph Hellwig break; 585f46b5a66SChristoph Hellwig case S_IFREG: 586f46b5a66SChristoph Hellwig btrfs_defrag_file(file); 587f46b5a66SChristoph Hellwig break; 588f46b5a66SChristoph Hellwig } 589f46b5a66SChristoph Hellwig 590f46b5a66SChristoph Hellwig return 0; 591f46b5a66SChristoph Hellwig } 592f46b5a66SChristoph Hellwig 593f46b5a66SChristoph Hellwig long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 594f46b5a66SChristoph Hellwig { 595f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 596f46b5a66SChristoph Hellwig int ret; 597f46b5a66SChristoph Hellwig 598f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 599f46b5a66SChristoph Hellwig 600f46b5a66SChristoph Hellwig if (!vol_args) 601f46b5a66SChristoph Hellwig return -ENOMEM; 602f46b5a66SChristoph Hellwig 603f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 604f46b5a66SChristoph Hellwig ret = -EFAULT; 605f46b5a66SChristoph Hellwig goto out; 606f46b5a66SChristoph Hellwig } 6075516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 608f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 609f46b5a66SChristoph Hellwig 610f46b5a66SChristoph Hellwig out: 611f46b5a66SChristoph Hellwig kfree(vol_args); 612f46b5a66SChristoph Hellwig return ret; 613f46b5a66SChristoph Hellwig } 614f46b5a66SChristoph Hellwig 615f46b5a66SChristoph Hellwig long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 616f46b5a66SChristoph Hellwig { 617f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 618f46b5a66SChristoph Hellwig int ret; 619f46b5a66SChristoph Hellwig 620c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 621c146afadSYan Zheng return -EROFS; 622c146afadSYan Zheng 623f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 624f46b5a66SChristoph Hellwig 625f46b5a66SChristoph Hellwig if (!vol_args) 626f46b5a66SChristoph Hellwig return -ENOMEM; 627f46b5a66SChristoph Hellwig 628f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 629f46b5a66SChristoph Hellwig ret = -EFAULT; 630f46b5a66SChristoph Hellwig goto out; 631f46b5a66SChristoph Hellwig } 6325516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 633f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 634f46b5a66SChristoph Hellwig 635f46b5a66SChristoph Hellwig out: 636f46b5a66SChristoph Hellwig kfree(vol_args); 637f46b5a66SChristoph Hellwig return ret; 638f46b5a66SChristoph Hellwig } 639f46b5a66SChristoph Hellwig 640c5c9cd4dSSage Weil long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off, 641c5c9cd4dSSage Weil u64 olen, u64 destoff) 642f46b5a66SChristoph Hellwig { 643f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 644f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 645f46b5a66SChristoph Hellwig struct file *src_file; 646f46b5a66SChristoph Hellwig struct inode *src; 647f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 648f46b5a66SChristoph Hellwig struct btrfs_path *path; 649f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 650ae01a0abSYan Zheng char *buf; 651ae01a0abSYan Zheng struct btrfs_key key; 652f46b5a66SChristoph Hellwig u32 nritems; 653f46b5a66SChristoph Hellwig int slot; 654ae01a0abSYan Zheng int ret; 655c5c9cd4dSSage Weil u64 len = olen; 656c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 657c5c9cd4dSSage Weil u64 hint_byte; 658f46b5a66SChristoph Hellwig 659c5c9cd4dSSage Weil /* 660c5c9cd4dSSage Weil * TODO: 661c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 662c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 663c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 664c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 665c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 666c5c9cd4dSSage Weil * they don't overlap)? 667c5c9cd4dSSage Weil */ 668c5c9cd4dSSage Weil 669c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 670c146afadSYan Zheng if (ret) 671c146afadSYan Zheng return ret; 672c146afadSYan Zheng 673c5c9cd4dSSage Weil src_file = fget(srcfd); 674f46b5a66SChristoph Hellwig if (!src_file) 675f46b5a66SChristoph Hellwig return -EBADF; 676f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 677f46b5a66SChristoph Hellwig 678c5c9cd4dSSage Weil ret = -EINVAL; 679c5c9cd4dSSage Weil if (src == inode) 680c5c9cd4dSSage Weil goto out_fput; 681c5c9cd4dSSage Weil 682ae01a0abSYan Zheng ret = -EISDIR; 683ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 684f46b5a66SChristoph Hellwig goto out_fput; 685f46b5a66SChristoph Hellwig 686ae01a0abSYan Zheng ret = -EXDEV; 687ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 688ae01a0abSYan Zheng goto out_fput; 689ae01a0abSYan Zheng 690ae01a0abSYan Zheng ret = -ENOMEM; 691ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 692ae01a0abSYan Zheng if (!buf) 693ae01a0abSYan Zheng goto out_fput; 694ae01a0abSYan Zheng 695ae01a0abSYan Zheng path = btrfs_alloc_path(); 696ae01a0abSYan Zheng if (!path) { 697ae01a0abSYan Zheng vfree(buf); 698ae01a0abSYan Zheng goto out_fput; 699ae01a0abSYan Zheng } 700ae01a0abSYan Zheng path->reada = 2; 701ae01a0abSYan Zheng 702f46b5a66SChristoph Hellwig if (inode < src) { 703f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 704f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 705f46b5a66SChristoph Hellwig } else { 706f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 707f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 708f46b5a66SChristoph Hellwig } 709f46b5a66SChristoph Hellwig 710c5c9cd4dSSage Weil /* determine range to clone */ 711c5c9cd4dSSage Weil ret = -EINVAL; 712c5c9cd4dSSage Weil if (off >= src->i_size || off + len > src->i_size) 713f46b5a66SChristoph Hellwig goto out_unlock; 714c5c9cd4dSSage Weil if (len == 0) 715c5c9cd4dSSage Weil olen = len = src->i_size - off; 716c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 717c5c9cd4dSSage Weil if (off + len == src->i_size) 718c5c9cd4dSSage Weil len = ((src->i_size + bs-1) & ~(bs-1)) 719c5c9cd4dSSage Weil - off; 720c5c9cd4dSSage Weil 721c5c9cd4dSSage Weil /* verify the end result is block aligned */ 722c5c9cd4dSSage Weil if ((off & (bs-1)) || 723c5c9cd4dSSage Weil ((off + len) & (bs-1))) 724c5c9cd4dSSage Weil goto out_unlock; 725c5c9cd4dSSage Weil 726c5c9cd4dSSage Weil printk("final src extent is %llu~%llu\n", off, len); 727c5c9cd4dSSage Weil printk("final dst extent is %llu~%llu\n", destoff, len); 728f46b5a66SChristoph Hellwig 729f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 730f46b5a66SChristoph Hellwig another, and lock file content */ 731f46b5a66SChristoph Hellwig while (1) { 73231840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 733c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 734c5c9cd4dSSage Weil ordered = btrfs_lookup_first_ordered_extent(inode, off+len); 735ae01a0abSYan Zheng if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) 736f46b5a66SChristoph Hellwig break; 737c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 738ae01a0abSYan Zheng if (ordered) 739ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 740c5c9cd4dSSage Weil btrfs_wait_ordered_range(src, off, off+len); 741f46b5a66SChristoph Hellwig } 742f46b5a66SChristoph Hellwig 743ae01a0abSYan Zheng trans = btrfs_start_transaction(root, 1); 744ae01a0abSYan Zheng BUG_ON(!trans); 745ae01a0abSYan Zheng 746c5c9cd4dSSage Weil /* punch hole in destination first */ 747c5c9cd4dSSage Weil btrfs_drop_extents(trans, root, inode, off, off+len, 0, &hint_byte); 748c5c9cd4dSSage Weil 749c5c9cd4dSSage Weil /* clone data */ 750f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 751ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 752ae01a0abSYan Zheng key.offset = 0; 753f46b5a66SChristoph Hellwig 754f46b5a66SChristoph Hellwig while (1) { 755f46b5a66SChristoph Hellwig /* 756f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 757f46b5a66SChristoph Hellwig * tree. 758f46b5a66SChristoph Hellwig */ 759f46b5a66SChristoph Hellwig ret = btrfs_search_slot(trans, root, &key, path, 0, 0); 760f46b5a66SChristoph Hellwig if (ret < 0) 761f46b5a66SChristoph Hellwig goto out; 762f46b5a66SChristoph Hellwig 763ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 764ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 765f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 766f46b5a66SChristoph Hellwig if (ret < 0) 767f46b5a66SChristoph Hellwig goto out; 768f46b5a66SChristoph Hellwig if (ret > 0) 769f46b5a66SChristoph Hellwig break; 770ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 771f46b5a66SChristoph Hellwig } 772f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 773f46b5a66SChristoph Hellwig slot = path->slots[0]; 774f46b5a66SChristoph Hellwig 775ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 776f46b5a66SChristoph Hellwig if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY || 777f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 778f46b5a66SChristoph Hellwig break; 779f46b5a66SChristoph Hellwig 780c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 781c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 782c5c9cd4dSSage Weil int type; 78331840ae1SZheng Yan u32 size; 78431840ae1SZheng Yan struct btrfs_key new_key; 785c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 786c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 787c5c9cd4dSSage Weil u8 comp; 78831840ae1SZheng Yan 78931840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 79031840ae1SZheng Yan read_extent_buffer(leaf, buf, 79131840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 79231840ae1SZheng Yan size); 793c5c9cd4dSSage Weil 794c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 795c5c9cd4dSSage Weil struct btrfs_file_extent_item); 796c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 797c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 798c5c9cd4dSSage Weil if (type == BTRFS_FILE_EXTENT_REG) { 799c5c9cd4dSSage Weil disko = btrfs_file_extent_disk_bytenr(leaf, extent); 800c5c9cd4dSSage Weil diskl = btrfs_file_extent_disk_num_bytes(leaf, extent); 801c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 802c5c9cd4dSSage Weil datal = btrfs_file_extent_num_bytes(leaf, extent); 803c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 804c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 805c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 806c5c9cd4dSSage Weil extent); 807c5c9cd4dSSage Weil } 80831840ae1SZheng Yan btrfs_release_path(root, path); 80931840ae1SZheng Yan 810c5c9cd4dSSage Weil if (key.offset + datal < off || 811c5c9cd4dSSage Weil key.offset >= off+len) 812c5c9cd4dSSage Weil goto next; 813c5c9cd4dSSage Weil 81431840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 81531840ae1SZheng Yan new_key.objectid = inode->i_ino; 816c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 817c5c9cd4dSSage Weil 818c5c9cd4dSSage Weil if (type == BTRFS_FILE_EXTENT_REG) { 81931840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 82031840ae1SZheng Yan &new_key, size); 82131840ae1SZheng Yan if (ret) 82231840ae1SZheng Yan goto out; 82331840ae1SZheng Yan 82431840ae1SZheng Yan leaf = path->nodes[0]; 82531840ae1SZheng Yan slot = path->slots[0]; 82631840ae1SZheng Yan write_extent_buffer(leaf, buf, 82731840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 82831840ae1SZheng Yan size); 829ae01a0abSYan Zheng 830f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 831f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 832c5c9cd4dSSage Weil printk(" orig disk %llu~%llu data %llu~%llu\n", 833c5c9cd4dSSage Weil disko, diskl, datao, datal); 834c5c9cd4dSSage Weil 835c5c9cd4dSSage Weil if (off > key.offset) { 836c5c9cd4dSSage Weil datao += off - key.offset; 837c5c9cd4dSSage Weil datal -= off - key.offset; 838c5c9cd4dSSage Weil } 839c5c9cd4dSSage Weil if (key.offset + datao + datal + key.offset > 840c5c9cd4dSSage Weil off + len) 841c5c9cd4dSSage Weil datal = off + len - key.offset - datao; 842c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 843c5c9cd4dSSage Weil if (!disko) 844c5c9cd4dSSage Weil datao = 0; 845c5c9cd4dSSage Weil printk(" final disk %llu~%llu data %llu~%llu\n", 846c5c9cd4dSSage Weil disko, diskl, datao, datal); 847c5c9cd4dSSage Weil 848c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 849c5c9cd4dSSage Weil datao); 850c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 851c5c9cd4dSSage Weil datal); 852c5c9cd4dSSage Weil if (disko) { 853c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 854ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 855c5c9cd4dSSage Weil disko, diskl, leaf->start, 856f46b5a66SChristoph Hellwig root->root_key.objectid, 857f46b5a66SChristoph Hellwig trans->transid, 8583bb1a1bcSYan Zheng inode->i_ino); 859ae01a0abSYan Zheng BUG_ON(ret); 860f46b5a66SChristoph Hellwig } 861c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 862c5c9cd4dSSage Weil u64 skip = 0; 863c5c9cd4dSSage Weil u64 trim = 0; 864c5c9cd4dSSage Weil if (off > key.offset) { 865c5c9cd4dSSage Weil skip = off - key.offset; 866c5c9cd4dSSage Weil new_key.offset += skip; 86731840ae1SZheng Yan } 868c5c9cd4dSSage Weil if (key.offset + datal > off+len) 869c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 870c5c9cd4dSSage Weil printk("len %lld skip %lld trim %lld\n", 871c5c9cd4dSSage Weil datal, skip, trim); 872c5c9cd4dSSage Weil if (comp && (skip || trim)) { 873c5c9cd4dSSage Weil printk("btrfs clone_range can't split compressed inline extents yet\n"); 874c5c9cd4dSSage Weil ret = -EINVAL; 875c5c9cd4dSSage Weil goto out; 87631840ae1SZheng Yan } 877c5c9cd4dSSage Weil size -= skip + trim; 878c5c9cd4dSSage Weil datal -= skip + trim; 879c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 880c5c9cd4dSSage Weil &new_key, size); 881c5c9cd4dSSage Weil if (ret) 882c5c9cd4dSSage Weil goto out; 883c5c9cd4dSSage Weil 884c5c9cd4dSSage Weil if (skip) { 885c5c9cd4dSSage Weil u32 start = btrfs_file_extent_calc_inline_size(0); 886c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 887c5c9cd4dSSage Weil datal); 888c5c9cd4dSSage Weil } 889c5c9cd4dSSage Weil 890c5c9cd4dSSage Weil leaf = path->nodes[0]; 891c5c9cd4dSSage Weil slot = path->slots[0]; 892c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 893c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 894c5c9cd4dSSage Weil size); 895c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 896c5c9cd4dSSage Weil } 897c5c9cd4dSSage Weil 898c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 899c5c9cd4dSSage Weil } 900c5c9cd4dSSage Weil 901c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) { 902c5c9cd4dSSage Weil u32 size; 903c5c9cd4dSSage Weil struct btrfs_key new_key; 904c5c9cd4dSSage Weil u64 coverslen; 905c5c9cd4dSSage Weil int coff, clen; 906c5c9cd4dSSage Weil 907c5c9cd4dSSage Weil size = btrfs_item_size_nr(leaf, slot); 908c5c9cd4dSSage Weil coverslen = (size / BTRFS_CRC32_SIZE) << 909c5c9cd4dSSage Weil root->fs_info->sb->s_blocksize_bits; 910c5c9cd4dSSage Weil printk("csums for %llu~%llu\n", 911c5c9cd4dSSage Weil key.offset, coverslen); 912c5c9cd4dSSage Weil if (key.offset + coverslen < off || 913c5c9cd4dSSage Weil key.offset >= off+len) 914c5c9cd4dSSage Weil goto next; 915c5c9cd4dSSage Weil 916c5c9cd4dSSage Weil read_extent_buffer(leaf, buf, 917c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 918c5c9cd4dSSage Weil size); 919c5c9cd4dSSage Weil btrfs_release_path(root, path); 920c5c9cd4dSSage Weil 921c5c9cd4dSSage Weil coff = 0; 922c5c9cd4dSSage Weil if (off > key.offset) 923c5c9cd4dSSage Weil coff = ((off - key.offset) >> 924c5c9cd4dSSage Weil root->fs_info->sb->s_blocksize_bits) * 925c5c9cd4dSSage Weil BTRFS_CRC32_SIZE; 926c5c9cd4dSSage Weil clen = size - coff; 927c5c9cd4dSSage Weil if (key.offset + coverslen > off+len) 928c5c9cd4dSSage Weil clen -= ((key.offset+coverslen-off-len) >> 929c5c9cd4dSSage Weil root->fs_info->sb->s_blocksize_bits) * 930c5c9cd4dSSage Weil BTRFS_CRC32_SIZE; 931c5c9cd4dSSage Weil printk(" will dup %d~%d of %d\n", 932c5c9cd4dSSage Weil coff, clen, size); 933c5c9cd4dSSage Weil 934c5c9cd4dSSage Weil memcpy(&new_key, &key, sizeof(new_key)); 935c5c9cd4dSSage Weil new_key.objectid = inode->i_ino; 936c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 937c5c9cd4dSSage Weil 938c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 939c5c9cd4dSSage Weil &new_key, clen); 940c5c9cd4dSSage Weil if (ret) 941c5c9cd4dSSage Weil goto out; 942c5c9cd4dSSage Weil 943c5c9cd4dSSage Weil leaf = path->nodes[0]; 944c5c9cd4dSSage Weil slot = path->slots[0]; 945c5c9cd4dSSage Weil write_extent_buffer(leaf, buf + coff, 946c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 947c5c9cd4dSSage Weil clen); 948c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 949c5c9cd4dSSage Weil } 950c5c9cd4dSSage Weil 951c5c9cd4dSSage Weil next: 95231840ae1SZheng Yan btrfs_release_path(root, path); 953ae01a0abSYan Zheng key.offset++; 954ae01a0abSYan Zheng } 955f46b5a66SChristoph Hellwig ret = 0; 956f46b5a66SChristoph Hellwig out: 957ae01a0abSYan Zheng btrfs_release_path(root, path); 958ae01a0abSYan Zheng if (ret == 0) { 959ae01a0abSYan Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 960c5c9cd4dSSage Weil if (destoff + olen > inode->i_size) 961c5c9cd4dSSage Weil btrfs_i_size_write(inode, destoff + olen); 962ae01a0abSYan Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 963ae01a0abSYan Zheng ret = btrfs_update_inode(trans, root, inode); 964ae01a0abSYan Zheng } 965f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 966c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 967ae01a0abSYan Zheng if (ret) 968ae01a0abSYan Zheng vmtruncate(inode, 0); 969f46b5a66SChristoph Hellwig out_unlock: 970f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 971f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 972ae01a0abSYan Zheng vfree(buf); 973ae01a0abSYan Zheng btrfs_free_path(path); 974f46b5a66SChristoph Hellwig out_fput: 975f46b5a66SChristoph Hellwig fput(src_file); 976f46b5a66SChristoph Hellwig return ret; 977f46b5a66SChristoph Hellwig } 978f46b5a66SChristoph Hellwig 979c5c9cd4dSSage Weil long btrfs_ioctl_clone_range(struct file *file, unsigned long argptr) 980c5c9cd4dSSage Weil { 981c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 982c5c9cd4dSSage Weil 983c5c9cd4dSSage Weil if (copy_from_user(&args, (void *)argptr, sizeof(args))) 984c5c9cd4dSSage Weil return -EFAULT; 985c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 986c5c9cd4dSSage Weil args.src_length, args.dest_offset); 987c5c9cd4dSSage Weil } 988c5c9cd4dSSage Weil 989f46b5a66SChristoph Hellwig /* 990f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 991f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 992f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 993f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 994f46b5a66SChristoph Hellwig */ 995f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_start(struct file *file) 996f46b5a66SChristoph Hellwig { 997f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 998f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 999f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1000f46b5a66SChristoph Hellwig int ret = 0; 1001f46b5a66SChristoph Hellwig 1002df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 1003df5b5520SChristoph Hellwig return -EPERM; 1004df5b5520SChristoph Hellwig 1005f46b5a66SChristoph Hellwig if (file->private_data) { 1006f46b5a66SChristoph Hellwig ret = -EINPROGRESS; 1007f46b5a66SChristoph Hellwig goto out; 1008f46b5a66SChristoph Hellwig } 10099ca9ee09SSage Weil 1010c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1011c146afadSYan Zheng if (ret) 1012c146afadSYan Zheng goto out; 1013c146afadSYan Zheng 10149ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 10159ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 10169ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 10179ca9ee09SSage Weil 10189ca9ee09SSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 1019f46b5a66SChristoph Hellwig if (trans) 1020f46b5a66SChristoph Hellwig file->private_data = trans; 1021f46b5a66SChristoph Hellwig else 1022f46b5a66SChristoph Hellwig ret = -ENOMEM; 1023f46b5a66SChristoph Hellwig /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/ 1024f46b5a66SChristoph Hellwig out: 1025f46b5a66SChristoph Hellwig return ret; 1026f46b5a66SChristoph Hellwig } 1027f46b5a66SChristoph Hellwig 1028f46b5a66SChristoph Hellwig /* 1029f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1030f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1031f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1032f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1033f46b5a66SChristoph Hellwig */ 1034f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 1035f46b5a66SChristoph Hellwig { 1036f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1037f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1038f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1039f46b5a66SChristoph Hellwig int ret = 0; 1040f46b5a66SChristoph Hellwig 1041f46b5a66SChristoph Hellwig trans = file->private_data; 1042f46b5a66SChristoph Hellwig if (!trans) { 1043f46b5a66SChristoph Hellwig ret = -EINVAL; 1044f46b5a66SChristoph Hellwig goto out; 1045f46b5a66SChristoph Hellwig } 1046f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 1047b214107eSChristoph Hellwig file->private_data = NULL; 10489ca9ee09SSage Weil 10499ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 10509ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 10519ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 10529ca9ee09SSage Weil 1053f46b5a66SChristoph Hellwig out: 1054f46b5a66SChristoph Hellwig return ret; 1055f46b5a66SChristoph Hellwig } 1056f46b5a66SChristoph Hellwig 1057f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 1058f46b5a66SChristoph Hellwig cmd, unsigned long arg) 1059f46b5a66SChristoph Hellwig { 1060f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 1061f46b5a66SChristoph Hellwig 1062f46b5a66SChristoph Hellwig switch (cmd) { 1063f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 10643de4586cSChris Mason return btrfs_ioctl_snap_create(file, (void __user *)arg, 0); 10653de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 10663de4586cSChris Mason return btrfs_ioctl_snap_create(file, (void __user *)arg, 1); 1067f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 1068f46b5a66SChristoph Hellwig return btrfs_ioctl_defrag(file); 1069f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 1070f46b5a66SChristoph Hellwig return btrfs_ioctl_resize(root, (void __user *)arg); 1071f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 1072f46b5a66SChristoph Hellwig return btrfs_ioctl_add_dev(root, (void __user *)arg); 1073f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 1074f46b5a66SChristoph Hellwig return btrfs_ioctl_rm_dev(root, (void __user *)arg); 1075f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 1076f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 1077f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 1078c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 1079c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 1080c5c9cd4dSSage Weil return btrfs_ioctl_clone_range(file, arg); 1081f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 1082f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 1083f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 1084f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 1085f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 1086ea8c2819SChris Mason btrfs_start_delalloc_inodes(root); 1087f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 1088f46b5a66SChristoph Hellwig return 0; 1089f46b5a66SChristoph Hellwig } 1090f46b5a66SChristoph Hellwig 1091f46b5a66SChristoph Hellwig return -ENOTTY; 1092f46b5a66SChristoph Hellwig } 1093