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> 444b4e25f2SChris Mason #include "compat.h" 45f46b5a66SChristoph Hellwig #include "ctree.h" 46f46b5a66SChristoph Hellwig #include "disk-io.h" 47f46b5a66SChristoph Hellwig #include "transaction.h" 48f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 49f46b5a66SChristoph Hellwig #include "ioctl.h" 50f46b5a66SChristoph Hellwig #include "print-tree.h" 51f46b5a66SChristoph Hellwig #include "volumes.h" 52925baeddSChris Mason #include "locking.h" 53f46b5a66SChristoph Hellwig 54f46b5a66SChristoph Hellwig 55f46b5a66SChristoph Hellwig 56cb8e7090SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, 57cb8e7090SChristoph Hellwig struct dentry *dentry, 58cb8e7090SChristoph Hellwig char *name, int namelen) 59f46b5a66SChristoph Hellwig { 60f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 61f46b5a66SChristoph Hellwig struct btrfs_key key; 62f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 63f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 64f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 65f46b5a66SChristoph Hellwig struct btrfs_root *new_root = root; 66f46b5a66SChristoph Hellwig struct inode *dir; 67f46b5a66SChristoph Hellwig int ret; 68f46b5a66SChristoph Hellwig int err; 69f46b5a66SChristoph Hellwig u64 objectid; 70f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 713de4586cSChris Mason u64 index = 0; 72f46b5a66SChristoph Hellwig unsigned long nr = 1; 73f46b5a66SChristoph Hellwig 74f46b5a66SChristoph Hellwig ret = btrfs_check_free_space(root, 1, 0); 75f46b5a66SChristoph Hellwig if (ret) 76f46b5a66SChristoph Hellwig goto fail_commit; 77f46b5a66SChristoph Hellwig 78f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 79f46b5a66SChristoph Hellwig BUG_ON(!trans); 80f46b5a66SChristoph Hellwig 81f46b5a66SChristoph Hellwig ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, 82f46b5a66SChristoph Hellwig 0, &objectid); 83f46b5a66SChristoph Hellwig if (ret) 84f46b5a66SChristoph Hellwig goto fail; 85f46b5a66SChristoph Hellwig 8631840ae1SZheng Yan leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, 8731840ae1SZheng Yan objectid, trans->transid, 0, 0, 0); 888e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 898e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 908e8a1e31SJosef Bacik goto fail; 918e8a1e31SJosef Bacik } 92f46b5a66SChristoph Hellwig 93f46b5a66SChristoph Hellwig btrfs_set_header_nritems(leaf, 0); 94f46b5a66SChristoph Hellwig btrfs_set_header_level(leaf, 0); 95f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 96f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 97f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 98f46b5a66SChristoph Hellwig 99f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 100f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 101f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 102f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 103f46b5a66SChristoph Hellwig 104f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 105f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 106f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 107f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 108f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 109a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 110f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 111f46b5a66SChristoph Hellwig 112f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 11384234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 114f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 115f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 116f46b5a66SChristoph Hellwig btrfs_set_root_used(&root_item, 0); 11780ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 118f46b5a66SChristoph Hellwig 119f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 120f46b5a66SChristoph Hellwig root_item.drop_level = 0; 121f46b5a66SChristoph Hellwig 122925baeddSChris Mason btrfs_tree_unlock(leaf); 123f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 124f46b5a66SChristoph Hellwig leaf = NULL; 125f46b5a66SChristoph Hellwig 126f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 127f46b5a66SChristoph Hellwig 128f46b5a66SChristoph Hellwig key.objectid = objectid; 129f46b5a66SChristoph Hellwig key.offset = 1; 130f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 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; 1490660b5afSChris Mason 1500660b5afSChris Mason /* add the backref first */ 1510660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 1520660b5afSChris Mason objectid, BTRFS_ROOT_BACKREF_KEY, 1530660b5afSChris Mason root->root_key.objectid, 1540660b5afSChris Mason dir->i_ino, index, name, namelen); 1550660b5afSChris Mason 1560660b5afSChris Mason BUG_ON(ret); 1570660b5afSChris Mason 1580660b5afSChris Mason /* now add the forward ref */ 1590660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 1600660b5afSChris Mason root->root_key.objectid, BTRFS_ROOT_REF_KEY, 1610660b5afSChris Mason objectid, 1620660b5afSChris Mason dir->i_ino, index, name, namelen); 1630660b5afSChris Mason 1640660b5afSChris Mason BUG_ON(ret); 1650660b5afSChris Mason 166f46b5a66SChristoph Hellwig ret = btrfs_commit_transaction(trans, root); 167f46b5a66SChristoph Hellwig if (ret) 168f46b5a66SChristoph Hellwig goto fail_commit; 169f46b5a66SChristoph Hellwig 1703de4586cSChris Mason new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 171f46b5a66SChristoph Hellwig BUG_ON(!new_root); 172f46b5a66SChristoph Hellwig 173f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(new_root, 1); 174f46b5a66SChristoph Hellwig BUG_ON(!trans); 175f46b5a66SChristoph Hellwig 176cb8e7090SChristoph Hellwig ret = btrfs_create_subvol_root(new_root, dentry, trans, new_dirid, 177f46b5a66SChristoph Hellwig BTRFS_I(dir)->block_group); 178f46b5a66SChristoph Hellwig if (ret) 179f46b5a66SChristoph Hellwig goto fail; 180f46b5a66SChristoph Hellwig 181f46b5a66SChristoph Hellwig fail: 182f46b5a66SChristoph Hellwig nr = trans->blocks_used; 183f46b5a66SChristoph Hellwig err = btrfs_commit_transaction(trans, new_root); 184f46b5a66SChristoph Hellwig if (err && !ret) 185f46b5a66SChristoph Hellwig ret = err; 186f46b5a66SChristoph Hellwig fail_commit: 187f46b5a66SChristoph Hellwig btrfs_btree_balance_dirty(root, nr); 188f46b5a66SChristoph Hellwig return ret; 189f46b5a66SChristoph Hellwig } 190f46b5a66SChristoph Hellwig 1913de4586cSChris Mason static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 1923de4586cSChris Mason char *name, int namelen) 193f46b5a66SChristoph Hellwig { 194f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 195f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1963de4586cSChris Mason int ret = 0; 197f46b5a66SChristoph Hellwig int err; 198f46b5a66SChristoph Hellwig unsigned long nr = 0; 199f46b5a66SChristoph Hellwig 200f46b5a66SChristoph Hellwig if (!root->ref_cows) 201f46b5a66SChristoph Hellwig return -EINVAL; 202f46b5a66SChristoph Hellwig 203f46b5a66SChristoph Hellwig ret = btrfs_check_free_space(root, 1, 0); 204f46b5a66SChristoph Hellwig if (ret) 205f46b5a66SChristoph Hellwig goto fail_unlock; 206f46b5a66SChristoph Hellwig 2073de4586cSChris Mason pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 208f46b5a66SChristoph Hellwig if (!pending_snapshot) { 209f46b5a66SChristoph Hellwig ret = -ENOMEM; 210f46b5a66SChristoph Hellwig goto fail_unlock; 211f46b5a66SChristoph Hellwig } 212f46b5a66SChristoph Hellwig pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); 213f46b5a66SChristoph Hellwig if (!pending_snapshot->name) { 214f46b5a66SChristoph Hellwig ret = -ENOMEM; 215f46b5a66SChristoph Hellwig kfree(pending_snapshot); 216f46b5a66SChristoph Hellwig goto fail_unlock; 217f46b5a66SChristoph Hellwig } 218f46b5a66SChristoph Hellwig memcpy(pending_snapshot->name, name, namelen); 219f46b5a66SChristoph Hellwig pending_snapshot->name[namelen] = '\0'; 2203de4586cSChris Mason pending_snapshot->dentry = dentry; 221f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 222f46b5a66SChristoph Hellwig BUG_ON(!trans); 223f46b5a66SChristoph Hellwig pending_snapshot->root = root; 224f46b5a66SChristoph Hellwig list_add(&pending_snapshot->list, 225f46b5a66SChristoph Hellwig &trans->transaction->pending_snapshots); 226f46b5a66SChristoph Hellwig err = btrfs_commit_transaction(trans, root); 227f46b5a66SChristoph Hellwig 228f46b5a66SChristoph Hellwig fail_unlock: 229f46b5a66SChristoph Hellwig btrfs_btree_balance_dirty(root, nr); 230f46b5a66SChristoph Hellwig return ret; 231f46b5a66SChristoph Hellwig } 232f46b5a66SChristoph Hellwig 233cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 234cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 235cb8e7090SChristoph Hellwig { 236cb8e7090SChristoph Hellwig if (child->d_inode) 237cb8e7090SChristoph Hellwig return -EEXIST; 238cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 239cb8e7090SChristoph Hellwig return -ENOENT; 240cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 241cb8e7090SChristoph Hellwig } 242cb8e7090SChristoph Hellwig 243cb8e7090SChristoph Hellwig /* 244cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 245cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 246cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 247cb8e7090SChristoph Hellwig */ 248cb8e7090SChristoph Hellwig static noinline int btrfs_mksubvol(struct path *parent, char *name, 2493de4586cSChris Mason int mode, int namelen, 2503de4586cSChris Mason struct btrfs_root *snap_src) 251cb8e7090SChristoph Hellwig { 252cb8e7090SChristoph Hellwig struct dentry *dentry; 253cb8e7090SChristoph Hellwig int error; 254cb8e7090SChristoph Hellwig 255cb8e7090SChristoph Hellwig mutex_lock_nested(&parent->dentry->d_inode->i_mutex, I_MUTEX_PARENT); 256cb8e7090SChristoph Hellwig 257cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 258cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 259cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 260cb8e7090SChristoph Hellwig goto out_unlock; 261cb8e7090SChristoph Hellwig 262cb8e7090SChristoph Hellwig error = -EEXIST; 263cb8e7090SChristoph Hellwig if (dentry->d_inode) 264cb8e7090SChristoph Hellwig goto out_dput; 265cb8e7090SChristoph Hellwig 266cb8e7090SChristoph Hellwig if (!IS_POSIXACL(parent->dentry->d_inode)) 267cb8e7090SChristoph Hellwig mode &= ~current->fs->umask; 2683de4586cSChris Mason 269cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 270cb8e7090SChristoph Hellwig if (error) 271cb8e7090SChristoph Hellwig goto out_dput; 272cb8e7090SChristoph Hellwig 273cb8e7090SChristoph Hellwig error = btrfs_may_create(parent->dentry->d_inode, dentry); 274cb8e7090SChristoph Hellwig if (error) 275cb8e7090SChristoph Hellwig goto out_drop_write; 276cb8e7090SChristoph Hellwig 277cb8e7090SChristoph Hellwig /* 278cb8e7090SChristoph Hellwig * Actually perform the low-level subvolume creation after all 279cb8e7090SChristoph Hellwig * this VFS fuzz. 280cb8e7090SChristoph Hellwig * 281cb8e7090SChristoph Hellwig * Eventually we want to pass in an inode under which we create this 282cb8e7090SChristoph Hellwig * subvolume, but for now all are under the filesystem root. 283cb8e7090SChristoph Hellwig * 284cb8e7090SChristoph Hellwig * Also we should pass on the mode eventually to allow creating new 285cb8e7090SChristoph Hellwig * subvolume with specific mode bits. 286cb8e7090SChristoph Hellwig */ 2873de4586cSChris Mason if (snap_src) { 288ea9e8b11SChris Mason struct dentry *dir = dentry->d_parent; 289ea9e8b11SChris Mason struct dentry *test = dir->d_parent; 290ea9e8b11SChris Mason struct btrfs_path *path = btrfs_alloc_path(); 291ea9e8b11SChris Mason int ret; 292ea9e8b11SChris Mason u64 test_oid; 293ea9e8b11SChris Mason u64 parent_oid = BTRFS_I(dir->d_inode)->root->root_key.objectid; 294ea9e8b11SChris Mason 295ea9e8b11SChris Mason test_oid = snap_src->root_key.objectid; 296ea9e8b11SChris Mason 297ea9e8b11SChris Mason ret = btrfs_find_root_ref(snap_src->fs_info->tree_root, 298ea9e8b11SChris Mason path, parent_oid, test_oid); 299ea9e8b11SChris Mason if (ret == 0) 300ea9e8b11SChris Mason goto create; 301ea9e8b11SChris Mason btrfs_release_path(snap_src->fs_info->tree_root, path); 302ea9e8b11SChris Mason 303ea9e8b11SChris Mason /* we need to make sure we aren't creating a directory loop 304ea9e8b11SChris Mason * by taking a snapshot of something that has our current 305ea9e8b11SChris Mason * subvol in its directory tree. So, this loops through 306ea9e8b11SChris Mason * the dentries and checks the forward refs for each subvolume 307ea9e8b11SChris Mason * to see if is references the subvolume where we are 308ea9e8b11SChris Mason * placing this new snapshot. 309ea9e8b11SChris Mason */ 310ea9e8b11SChris Mason while(1) { 311ea9e8b11SChris Mason if (!test || 312ea9e8b11SChris Mason dir == snap_src->fs_info->sb->s_root || 313ea9e8b11SChris Mason test == snap_src->fs_info->sb->s_root || 314ea9e8b11SChris Mason test->d_inode->i_sb != snap_src->fs_info->sb) { 315ea9e8b11SChris Mason break; 316ea9e8b11SChris Mason } 317ea9e8b11SChris Mason if (S_ISLNK(test->d_inode->i_mode)) { 318ea9e8b11SChris Mason printk("Symlink in snapshot path, failed\n"); 319ea9e8b11SChris Mason error = -EMLINK; 320ea9e8b11SChris Mason btrfs_free_path(path); 321ea9e8b11SChris Mason goto out_drop_write; 322ea9e8b11SChris Mason } 323ea9e8b11SChris Mason test_oid = 324ea9e8b11SChris Mason BTRFS_I(test->d_inode)->root->root_key.objectid; 325ea9e8b11SChris Mason ret = btrfs_find_root_ref(snap_src->fs_info->tree_root, 326ea9e8b11SChris Mason path, test_oid, parent_oid); 327ea9e8b11SChris Mason if (ret == 0) { 328ea9e8b11SChris Mason printk("Snapshot creation failed, looping\n"); 329ea9e8b11SChris Mason error = -EMLINK; 330ea9e8b11SChris Mason btrfs_free_path(path); 331ea9e8b11SChris Mason goto out_drop_write; 332ea9e8b11SChris Mason } 333ea9e8b11SChris Mason btrfs_release_path(snap_src->fs_info->tree_root, path); 334ea9e8b11SChris Mason test = test->d_parent; 335ea9e8b11SChris Mason } 336ea9e8b11SChris Mason create: 337ea9e8b11SChris Mason btrfs_free_path(path); 3383de4586cSChris Mason error = create_snapshot(snap_src, dentry, name, namelen); 3393de4586cSChris Mason } else { 3403de4586cSChris Mason error = create_subvol(BTRFS_I(parent->dentry->d_inode)->root, 3413de4586cSChris Mason dentry, name, namelen); 3423de4586cSChris Mason } 343cb8e7090SChristoph Hellwig if (error) 344cb8e7090SChristoph Hellwig goto out_drop_write; 345cb8e7090SChristoph Hellwig 346cb8e7090SChristoph Hellwig fsnotify_mkdir(parent->dentry->d_inode, dentry); 347cb8e7090SChristoph Hellwig out_drop_write: 348cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 349cb8e7090SChristoph Hellwig out_dput: 350cb8e7090SChristoph Hellwig dput(dentry); 351cb8e7090SChristoph Hellwig out_unlock: 352cb8e7090SChristoph Hellwig mutex_unlock(&parent->dentry->d_inode->i_mutex); 353cb8e7090SChristoph Hellwig return error; 354cb8e7090SChristoph Hellwig } 355cb8e7090SChristoph Hellwig 356cb8e7090SChristoph Hellwig 357b2950863SChristoph Hellwig static int btrfs_defrag_file(struct file *file) 358f46b5a66SChristoph Hellwig { 359f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 360f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 361f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 3623eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 363f46b5a66SChristoph Hellwig struct page *page; 364f46b5a66SChristoph Hellwig unsigned long last_index; 365f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 366f46b5a66SChristoph Hellwig unsigned long total_read = 0; 367f46b5a66SChristoph Hellwig u64 page_start; 368f46b5a66SChristoph Hellwig u64 page_end; 369f46b5a66SChristoph Hellwig unsigned long i; 370f46b5a66SChristoph Hellwig int ret; 371f46b5a66SChristoph Hellwig 372f46b5a66SChristoph Hellwig ret = btrfs_check_free_space(root, inode->i_size, 0); 373f46b5a66SChristoph Hellwig if (ret) 374f46b5a66SChristoph Hellwig return -ENOSPC; 375f46b5a66SChristoph Hellwig 376f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 377f46b5a66SChristoph Hellwig last_index = inode->i_size >> PAGE_CACHE_SHIFT; 378f46b5a66SChristoph Hellwig for (i = 0; i <= last_index; i++) { 379f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 380f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 381f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 382f46b5a66SChristoph Hellwig } 383f46b5a66SChristoph Hellwig total_read++; 3843eaa2885SChris Mason again: 385f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 386f46b5a66SChristoph Hellwig if (!page) 387f46b5a66SChristoph Hellwig goto out_unlock; 388f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 389f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 390f46b5a66SChristoph Hellwig lock_page(page); 391f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 392f46b5a66SChristoph Hellwig unlock_page(page); 393f46b5a66SChristoph Hellwig page_cache_release(page); 394f46b5a66SChristoph Hellwig goto out_unlock; 395f46b5a66SChristoph Hellwig } 396f46b5a66SChristoph Hellwig } 397f46b5a66SChristoph Hellwig 398f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 399f46b5a66SChristoph Hellwig 400f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 401f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 402f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 4033eaa2885SChris Mason 4043eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 4053eaa2885SChris Mason if (ordered) { 4063eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 4073eaa2885SChris Mason unlock_page(page); 4083eaa2885SChris Mason page_cache_release(page); 4093eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 4103eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 4113eaa2885SChris Mason goto again; 4123eaa2885SChris Mason } 4133eaa2885SChris Mason set_page_extent_mapped(page); 4143eaa2885SChris Mason 415f87f057bSChris Mason /* 416f87f057bSChris Mason * this makes sure page_mkwrite is called on the 417f87f057bSChris Mason * page if it is dirtied again later 418f87f057bSChris Mason */ 419f87f057bSChris Mason clear_page_dirty_for_io(page); 420f87f057bSChris Mason 421ea8c2819SChris Mason btrfs_set_extent_delalloc(inode, page_start, page_end); 422f46b5a66SChristoph Hellwig 423f46b5a66SChristoph Hellwig unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 424f46b5a66SChristoph Hellwig set_page_dirty(page); 425f46b5a66SChristoph Hellwig unlock_page(page); 426f46b5a66SChristoph Hellwig page_cache_release(page); 427f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 428f46b5a66SChristoph Hellwig } 429f46b5a66SChristoph Hellwig 430f46b5a66SChristoph Hellwig out_unlock: 431f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 432f46b5a66SChristoph Hellwig return 0; 433f46b5a66SChristoph Hellwig } 434f46b5a66SChristoph Hellwig 435f46b5a66SChristoph Hellwig /* 436f46b5a66SChristoph Hellwig * Called inside transaction, so use GFP_NOFS 437f46b5a66SChristoph Hellwig */ 438f46b5a66SChristoph Hellwig 439f46b5a66SChristoph Hellwig static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) 440f46b5a66SChristoph Hellwig { 441f46b5a66SChristoph Hellwig u64 new_size; 442f46b5a66SChristoph Hellwig u64 old_size; 443f46b5a66SChristoph Hellwig u64 devid = 1; 444f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 445f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 446f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 447f46b5a66SChristoph Hellwig char *sizestr; 448f46b5a66SChristoph Hellwig char *devstr = NULL; 449f46b5a66SChristoph Hellwig int ret = 0; 450f46b5a66SChristoph Hellwig int namelen; 451f46b5a66SChristoph Hellwig int mod = 0; 452f46b5a66SChristoph Hellwig 453c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 454c146afadSYan Zheng return -EROFS; 455c146afadSYan Zheng 456f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 457f46b5a66SChristoph Hellwig 458f46b5a66SChristoph Hellwig if (!vol_args) 459f46b5a66SChristoph Hellwig return -ENOMEM; 460f46b5a66SChristoph Hellwig 461f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 462f46b5a66SChristoph Hellwig ret = -EFAULT; 463f46b5a66SChristoph Hellwig goto out; 464f46b5a66SChristoph Hellwig } 4655516e595SMark Fasheh 4665516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 467f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 468f46b5a66SChristoph Hellwig 4697d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 470f46b5a66SChristoph Hellwig sizestr = vol_args->name; 471f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 472f46b5a66SChristoph Hellwig if (devstr) { 473f46b5a66SChristoph Hellwig char *end; 474f46b5a66SChristoph Hellwig sizestr = devstr + 1; 475f46b5a66SChristoph Hellwig *devstr = '\0'; 476f46b5a66SChristoph Hellwig devstr = vol_args->name; 477f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 478f46b5a66SChristoph Hellwig printk(KERN_INFO "resizing devid %llu\n", devid); 479f46b5a66SChristoph Hellwig } 4802b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 481f46b5a66SChristoph Hellwig if (!device) { 482f46b5a66SChristoph Hellwig printk(KERN_INFO "resizer unable to find device %llu\n", devid); 483f46b5a66SChristoph Hellwig ret = -EINVAL; 484f46b5a66SChristoph Hellwig goto out_unlock; 485f46b5a66SChristoph Hellwig } 486f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 487f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 488f46b5a66SChristoph Hellwig else { 489f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 490f46b5a66SChristoph Hellwig mod = -1; 491f46b5a66SChristoph Hellwig sizestr++; 492f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 493f46b5a66SChristoph Hellwig mod = 1; 494f46b5a66SChristoph Hellwig sizestr++; 495f46b5a66SChristoph Hellwig } 496f46b5a66SChristoph Hellwig new_size = btrfs_parse_size(sizestr); 497f46b5a66SChristoph Hellwig if (new_size == 0) { 498f46b5a66SChristoph Hellwig ret = -EINVAL; 499f46b5a66SChristoph Hellwig goto out_unlock; 500f46b5a66SChristoph Hellwig } 501f46b5a66SChristoph Hellwig } 502f46b5a66SChristoph Hellwig 503f46b5a66SChristoph Hellwig old_size = device->total_bytes; 504f46b5a66SChristoph Hellwig 505f46b5a66SChristoph Hellwig if (mod < 0) { 506f46b5a66SChristoph Hellwig if (new_size > old_size) { 507f46b5a66SChristoph Hellwig ret = -EINVAL; 508f46b5a66SChristoph Hellwig goto out_unlock; 509f46b5a66SChristoph Hellwig } 510f46b5a66SChristoph Hellwig new_size = old_size - new_size; 511f46b5a66SChristoph Hellwig } else if (mod > 0) { 512f46b5a66SChristoph Hellwig new_size = old_size + new_size; 513f46b5a66SChristoph Hellwig } 514f46b5a66SChristoph Hellwig 515f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 516f46b5a66SChristoph Hellwig ret = -EINVAL; 517f46b5a66SChristoph Hellwig goto out_unlock; 518f46b5a66SChristoph Hellwig } 519f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 520f46b5a66SChristoph Hellwig ret = -EFBIG; 521f46b5a66SChristoph Hellwig goto out_unlock; 522f46b5a66SChristoph Hellwig } 523f46b5a66SChristoph Hellwig 524f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 525f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 526f46b5a66SChristoph Hellwig 527f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 528f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 529f46b5a66SChristoph Hellwig 530f46b5a66SChristoph Hellwig if (new_size > old_size) { 531f46b5a66SChristoph Hellwig trans = btrfs_start_transaction(root, 1); 532f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 533f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 534f46b5a66SChristoph Hellwig } else { 535f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 536f46b5a66SChristoph Hellwig } 537f46b5a66SChristoph Hellwig 538f46b5a66SChristoph Hellwig out_unlock: 5397d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 540f46b5a66SChristoph Hellwig out: 541f46b5a66SChristoph Hellwig kfree(vol_args); 542f46b5a66SChristoph Hellwig return ret; 543f46b5a66SChristoph Hellwig } 544f46b5a66SChristoph Hellwig 545cb8e7090SChristoph Hellwig static noinline int btrfs_ioctl_snap_create(struct file *file, 5463de4586cSChris Mason void __user *arg, int subvol) 547f46b5a66SChristoph Hellwig { 548cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 549f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 550f46b5a66SChristoph Hellwig struct btrfs_dir_item *di; 551f46b5a66SChristoph Hellwig struct btrfs_path *path; 5523de4586cSChris Mason struct file *src_file; 553f46b5a66SChristoph Hellwig u64 root_dirid; 554f46b5a66SChristoph Hellwig int namelen; 5553de4586cSChris Mason int ret = 0; 556f46b5a66SChristoph Hellwig 557c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 558c146afadSYan Zheng return -EROFS; 559c146afadSYan Zheng 560f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 561f46b5a66SChristoph Hellwig 562f46b5a66SChristoph Hellwig if (!vol_args) 563f46b5a66SChristoph Hellwig return -ENOMEM; 564f46b5a66SChristoph Hellwig 565f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 566f46b5a66SChristoph Hellwig ret = -EFAULT; 567f46b5a66SChristoph Hellwig goto out; 568f46b5a66SChristoph Hellwig } 569f46b5a66SChristoph Hellwig 5705516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 571f46b5a66SChristoph Hellwig namelen = strlen(vol_args->name); 572f46b5a66SChristoph Hellwig if (strchr(vol_args->name, '/')) { 573f46b5a66SChristoph Hellwig ret = -EINVAL; 574f46b5a66SChristoph Hellwig goto out; 575f46b5a66SChristoph Hellwig } 576f46b5a66SChristoph Hellwig 577f46b5a66SChristoph Hellwig path = btrfs_alloc_path(); 578f46b5a66SChristoph Hellwig if (!path) { 579f46b5a66SChristoph Hellwig ret = -ENOMEM; 580f46b5a66SChristoph Hellwig goto out; 581f46b5a66SChristoph Hellwig } 582f46b5a66SChristoph Hellwig 583f46b5a66SChristoph Hellwig root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, 584f46b5a66SChristoph Hellwig di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, 585f46b5a66SChristoph Hellwig path, root_dirid, 586f46b5a66SChristoph Hellwig vol_args->name, namelen, 0); 587f46b5a66SChristoph Hellwig btrfs_free_path(path); 588f46b5a66SChristoph Hellwig 589f46b5a66SChristoph Hellwig if (di && !IS_ERR(di)) { 590f46b5a66SChristoph Hellwig ret = -EEXIST; 591f46b5a66SChristoph Hellwig goto out; 592f46b5a66SChristoph Hellwig } 593f46b5a66SChristoph Hellwig 594f46b5a66SChristoph Hellwig if (IS_ERR(di)) { 595f46b5a66SChristoph Hellwig ret = PTR_ERR(di); 596f46b5a66SChristoph Hellwig goto out; 597f46b5a66SChristoph Hellwig } 598f46b5a66SChristoph Hellwig 5993de4586cSChris Mason if (subvol) { 600cb8e7090SChristoph Hellwig ret = btrfs_mksubvol(&file->f_path, vol_args->name, 601cb8e7090SChristoph Hellwig file->f_path.dentry->d_inode->i_mode, 6023de4586cSChris Mason namelen, NULL); 603cb8e7090SChristoph Hellwig } else { 6043de4586cSChris Mason struct inode *src_inode; 6053de4586cSChris Mason src_file = fget(vol_args->fd); 6063de4586cSChris Mason if (!src_file) { 6073de4586cSChris Mason ret = -EINVAL; 6083de4586cSChris Mason goto out; 6093de4586cSChris Mason } 6103de4586cSChris Mason 6113de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 6123de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 6133de4586cSChris Mason printk("btrfs: Snapshot src from another FS\n"); 6143de4586cSChris Mason ret = -EINVAL; 6153de4586cSChris Mason fput(src_file); 6163de4586cSChris Mason goto out; 6173de4586cSChris Mason } 6183de4586cSChris Mason ret = btrfs_mksubvol(&file->f_path, vol_args->name, 6193de4586cSChris Mason file->f_path.dentry->d_inode->i_mode, 6203de4586cSChris Mason namelen, BTRFS_I(src_inode)->root); 6213de4586cSChris Mason fput(src_file); 622cb8e7090SChristoph Hellwig } 623cb8e7090SChristoph Hellwig 624f46b5a66SChristoph Hellwig out: 625f46b5a66SChristoph Hellwig kfree(vol_args); 626f46b5a66SChristoph Hellwig return ret; 627f46b5a66SChristoph Hellwig } 628f46b5a66SChristoph Hellwig 629f46b5a66SChristoph Hellwig static int btrfs_ioctl_defrag(struct file *file) 630f46b5a66SChristoph Hellwig { 631f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 632f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 633c146afadSYan Zheng int ret; 634c146afadSYan Zheng 635c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 636c146afadSYan Zheng if (ret) 637c146afadSYan Zheng return ret; 638f46b5a66SChristoph Hellwig 639f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 640f46b5a66SChristoph Hellwig case S_IFDIR: 641f46b5a66SChristoph Hellwig btrfs_defrag_root(root, 0); 642f46b5a66SChristoph Hellwig btrfs_defrag_root(root->fs_info->extent_root, 0); 643f46b5a66SChristoph Hellwig break; 644f46b5a66SChristoph Hellwig case S_IFREG: 645f46b5a66SChristoph Hellwig btrfs_defrag_file(file); 646f46b5a66SChristoph Hellwig break; 647f46b5a66SChristoph Hellwig } 648f46b5a66SChristoph Hellwig 649f46b5a66SChristoph Hellwig return 0; 650f46b5a66SChristoph Hellwig } 651f46b5a66SChristoph Hellwig 652b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 653f46b5a66SChristoph Hellwig { 654f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 655f46b5a66SChristoph Hellwig int ret; 656f46b5a66SChristoph Hellwig 657f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 658f46b5a66SChristoph Hellwig 659f46b5a66SChristoph Hellwig if (!vol_args) 660f46b5a66SChristoph Hellwig return -ENOMEM; 661f46b5a66SChristoph Hellwig 662f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 663f46b5a66SChristoph Hellwig ret = -EFAULT; 664f46b5a66SChristoph Hellwig goto out; 665f46b5a66SChristoph Hellwig } 6665516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 667f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 668f46b5a66SChristoph Hellwig 669f46b5a66SChristoph Hellwig out: 670f46b5a66SChristoph Hellwig kfree(vol_args); 671f46b5a66SChristoph Hellwig return ret; 672f46b5a66SChristoph Hellwig } 673f46b5a66SChristoph Hellwig 674b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 675f46b5a66SChristoph Hellwig { 676f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 677f46b5a66SChristoph Hellwig int ret; 678f46b5a66SChristoph Hellwig 679c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 680c146afadSYan Zheng return -EROFS; 681c146afadSYan Zheng 682f46b5a66SChristoph Hellwig vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); 683f46b5a66SChristoph Hellwig 684f46b5a66SChristoph Hellwig if (!vol_args) 685f46b5a66SChristoph Hellwig return -ENOMEM; 686f46b5a66SChristoph Hellwig 687f46b5a66SChristoph Hellwig if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { 688f46b5a66SChristoph Hellwig ret = -EFAULT; 689f46b5a66SChristoph Hellwig goto out; 690f46b5a66SChristoph Hellwig } 6915516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 692f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 693f46b5a66SChristoph Hellwig 694f46b5a66SChristoph Hellwig out: 695f46b5a66SChristoph Hellwig kfree(vol_args); 696f46b5a66SChristoph Hellwig return ret; 697f46b5a66SChristoph Hellwig } 698f46b5a66SChristoph Hellwig 699b2950863SChristoph Hellwig static long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 700b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 701f46b5a66SChristoph Hellwig { 702f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 703f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 704f46b5a66SChristoph Hellwig struct file *src_file; 705f46b5a66SChristoph Hellwig struct inode *src; 706f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 707f46b5a66SChristoph Hellwig struct btrfs_path *path; 708f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 709ae01a0abSYan Zheng char *buf; 710ae01a0abSYan Zheng struct btrfs_key key; 711f46b5a66SChristoph Hellwig u32 nritems; 712f46b5a66SChristoph Hellwig int slot; 713ae01a0abSYan Zheng int ret; 714c5c9cd4dSSage Weil u64 len = olen; 715c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 716c5c9cd4dSSage Weil u64 hint_byte; 717f46b5a66SChristoph Hellwig 718c5c9cd4dSSage Weil /* 719c5c9cd4dSSage Weil * TODO: 720c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 721c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 722c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 723c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 724c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 725c5c9cd4dSSage Weil * they don't overlap)? 726c5c9cd4dSSage Weil */ 727c5c9cd4dSSage Weil 728c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 729c146afadSYan Zheng if (ret) 730c146afadSYan Zheng return ret; 731c146afadSYan Zheng 732c5c9cd4dSSage Weil src_file = fget(srcfd); 733f46b5a66SChristoph Hellwig if (!src_file) 734f46b5a66SChristoph Hellwig return -EBADF; 735f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 736f46b5a66SChristoph Hellwig 737c5c9cd4dSSage Weil ret = -EINVAL; 738c5c9cd4dSSage Weil if (src == inode) 739c5c9cd4dSSage Weil goto out_fput; 740c5c9cd4dSSage Weil 741ae01a0abSYan Zheng ret = -EISDIR; 742ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 743f46b5a66SChristoph Hellwig goto out_fput; 744f46b5a66SChristoph Hellwig 745ae01a0abSYan Zheng ret = -EXDEV; 746ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 747ae01a0abSYan Zheng goto out_fput; 748ae01a0abSYan Zheng 749ae01a0abSYan Zheng ret = -ENOMEM; 750ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 751ae01a0abSYan Zheng if (!buf) 752ae01a0abSYan Zheng goto out_fput; 753ae01a0abSYan Zheng 754ae01a0abSYan Zheng path = btrfs_alloc_path(); 755ae01a0abSYan Zheng if (!path) { 756ae01a0abSYan Zheng vfree(buf); 757ae01a0abSYan Zheng goto out_fput; 758ae01a0abSYan Zheng } 759ae01a0abSYan Zheng path->reada = 2; 760ae01a0abSYan Zheng 761f46b5a66SChristoph Hellwig if (inode < src) { 762f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 763f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 764f46b5a66SChristoph Hellwig } else { 765f46b5a66SChristoph Hellwig mutex_lock(&src->i_mutex); 766f46b5a66SChristoph Hellwig mutex_lock(&inode->i_mutex); 767f46b5a66SChristoph Hellwig } 768f46b5a66SChristoph Hellwig 769c5c9cd4dSSage Weil /* determine range to clone */ 770c5c9cd4dSSage Weil ret = -EINVAL; 771c5c9cd4dSSage Weil if (off >= src->i_size || off + len > src->i_size) 772f46b5a66SChristoph Hellwig goto out_unlock; 773c5c9cd4dSSage Weil if (len == 0) 774c5c9cd4dSSage Weil olen = len = src->i_size - off; 775c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 776c5c9cd4dSSage Weil if (off + len == src->i_size) 777c5c9cd4dSSage Weil len = ((src->i_size + bs-1) & ~(bs-1)) 778c5c9cd4dSSage Weil - off; 779c5c9cd4dSSage Weil 780c5c9cd4dSSage Weil /* verify the end result is block aligned */ 781c5c9cd4dSSage Weil if ((off & (bs-1)) || 782c5c9cd4dSSage Weil ((off + len) & (bs-1))) 783c5c9cd4dSSage Weil goto out_unlock; 784c5c9cd4dSSage Weil 785c5c9cd4dSSage Weil printk("final src extent is %llu~%llu\n", off, len); 786c5c9cd4dSSage Weil printk("final dst extent is %llu~%llu\n", destoff, len); 787f46b5a66SChristoph Hellwig 788f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 789f46b5a66SChristoph Hellwig another, and lock file content */ 790f46b5a66SChristoph Hellwig while (1) { 79131840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 792c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 793c5c9cd4dSSage Weil ordered = btrfs_lookup_first_ordered_extent(inode, off+len); 794ae01a0abSYan Zheng if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) 795f46b5a66SChristoph Hellwig break; 796c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 797ae01a0abSYan Zheng if (ordered) 798ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 799c5c9cd4dSSage Weil btrfs_wait_ordered_range(src, off, off+len); 800f46b5a66SChristoph Hellwig } 801f46b5a66SChristoph Hellwig 802ae01a0abSYan Zheng trans = btrfs_start_transaction(root, 1); 803ae01a0abSYan Zheng BUG_ON(!trans); 804ae01a0abSYan Zheng 805c5c9cd4dSSage Weil /* punch hole in destination first */ 806c5c9cd4dSSage Weil btrfs_drop_extents(trans, root, inode, off, off+len, 0, &hint_byte); 807c5c9cd4dSSage Weil 808c5c9cd4dSSage Weil /* clone data */ 809f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 810ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 811ae01a0abSYan Zheng key.offset = 0; 812f46b5a66SChristoph Hellwig 813f46b5a66SChristoph Hellwig while (1) { 814f46b5a66SChristoph Hellwig /* 815f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 816f46b5a66SChristoph Hellwig * tree. 817f46b5a66SChristoph Hellwig */ 818f46b5a66SChristoph Hellwig ret = btrfs_search_slot(trans, root, &key, path, 0, 0); 819f46b5a66SChristoph Hellwig if (ret < 0) 820f46b5a66SChristoph Hellwig goto out; 821f46b5a66SChristoph Hellwig 822ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 823ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 824f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 825f46b5a66SChristoph Hellwig if (ret < 0) 826f46b5a66SChristoph Hellwig goto out; 827f46b5a66SChristoph Hellwig if (ret > 0) 828f46b5a66SChristoph Hellwig break; 829ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 830f46b5a66SChristoph Hellwig } 831f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 832f46b5a66SChristoph Hellwig slot = path->slots[0]; 833f46b5a66SChristoph Hellwig 834ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 835f46b5a66SChristoph Hellwig if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY || 836f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 837f46b5a66SChristoph Hellwig break; 838f46b5a66SChristoph Hellwig 839c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 840c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 841c5c9cd4dSSage Weil int type; 84231840ae1SZheng Yan u32 size; 84331840ae1SZheng Yan struct btrfs_key new_key; 844c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 845c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 846c5c9cd4dSSage Weil u8 comp; 84731840ae1SZheng Yan 84831840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 84931840ae1SZheng Yan read_extent_buffer(leaf, buf, 85031840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 85131840ae1SZheng Yan size); 852c5c9cd4dSSage Weil 853c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 854c5c9cd4dSSage Weil struct btrfs_file_extent_item); 855c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 856c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 857c5c9cd4dSSage Weil if (type == BTRFS_FILE_EXTENT_REG) { 858c5c9cd4dSSage Weil disko = btrfs_file_extent_disk_bytenr(leaf, extent); 859c5c9cd4dSSage Weil diskl = btrfs_file_extent_disk_num_bytes(leaf, extent); 860c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 861c5c9cd4dSSage Weil datal = btrfs_file_extent_num_bytes(leaf, extent); 862c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 863c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 864c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 865c5c9cd4dSSage Weil extent); 866c5c9cd4dSSage Weil } 86731840ae1SZheng Yan btrfs_release_path(root, path); 86831840ae1SZheng Yan 869c5c9cd4dSSage Weil if (key.offset + datal < off || 870c5c9cd4dSSage Weil key.offset >= off+len) 871c5c9cd4dSSage Weil goto next; 872c5c9cd4dSSage Weil 87331840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 87431840ae1SZheng Yan new_key.objectid = inode->i_ino; 875c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 876c5c9cd4dSSage Weil 877c5c9cd4dSSage Weil if (type == BTRFS_FILE_EXTENT_REG) { 87831840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 87931840ae1SZheng Yan &new_key, size); 88031840ae1SZheng Yan if (ret) 88131840ae1SZheng Yan goto out; 88231840ae1SZheng Yan 88331840ae1SZheng Yan leaf = path->nodes[0]; 88431840ae1SZheng Yan slot = path->slots[0]; 88531840ae1SZheng Yan write_extent_buffer(leaf, buf, 88631840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 88731840ae1SZheng Yan size); 888ae01a0abSYan Zheng 889f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 890f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 891c5c9cd4dSSage Weil printk(" orig disk %llu~%llu data %llu~%llu\n", 892c5c9cd4dSSage Weil disko, diskl, datao, datal); 893c5c9cd4dSSage Weil 894c5c9cd4dSSage Weil if (off > key.offset) { 895c5c9cd4dSSage Weil datao += off - key.offset; 896c5c9cd4dSSage Weil datal -= off - key.offset; 897c5c9cd4dSSage Weil } 898c5c9cd4dSSage Weil if (key.offset + datao + datal + key.offset > 899c5c9cd4dSSage Weil off + len) 900c5c9cd4dSSage Weil datal = off + len - key.offset - datao; 901c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 902c5c9cd4dSSage Weil if (!disko) 903c5c9cd4dSSage Weil datao = 0; 904c5c9cd4dSSage Weil printk(" final disk %llu~%llu data %llu~%llu\n", 905c5c9cd4dSSage Weil disko, diskl, datao, datal); 906c5c9cd4dSSage Weil 907c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 908c5c9cd4dSSage Weil datao); 909c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 910c5c9cd4dSSage Weil datal); 911c5c9cd4dSSage Weil if (disko) { 912c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 913ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 914c5c9cd4dSSage Weil disko, diskl, leaf->start, 915f46b5a66SChristoph Hellwig root->root_key.objectid, 916f46b5a66SChristoph Hellwig trans->transid, 9173bb1a1bcSYan Zheng inode->i_ino); 918ae01a0abSYan Zheng BUG_ON(ret); 919f46b5a66SChristoph Hellwig } 920c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 921c5c9cd4dSSage Weil u64 skip = 0; 922c5c9cd4dSSage Weil u64 trim = 0; 923c5c9cd4dSSage Weil if (off > key.offset) { 924c5c9cd4dSSage Weil skip = off - key.offset; 925c5c9cd4dSSage Weil new_key.offset += skip; 92631840ae1SZheng Yan } 927c5c9cd4dSSage Weil if (key.offset + datal > off+len) 928c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 929c5c9cd4dSSage Weil printk("len %lld skip %lld trim %lld\n", 930c5c9cd4dSSage Weil datal, skip, trim); 931c5c9cd4dSSage Weil if (comp && (skip || trim)) { 932c5c9cd4dSSage Weil printk("btrfs clone_range can't split compressed inline extents yet\n"); 933c5c9cd4dSSage Weil ret = -EINVAL; 934c5c9cd4dSSage Weil goto out; 93531840ae1SZheng Yan } 936c5c9cd4dSSage Weil size -= skip + trim; 937c5c9cd4dSSage Weil datal -= skip + trim; 938c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 939c5c9cd4dSSage Weil &new_key, size); 940c5c9cd4dSSage Weil if (ret) 941c5c9cd4dSSage Weil goto out; 942c5c9cd4dSSage Weil 943c5c9cd4dSSage Weil if (skip) { 944c5c9cd4dSSage Weil u32 start = btrfs_file_extent_calc_inline_size(0); 945c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 946c5c9cd4dSSage Weil datal); 947c5c9cd4dSSage Weil } 948c5c9cd4dSSage Weil 949c5c9cd4dSSage Weil leaf = path->nodes[0]; 950c5c9cd4dSSage Weil slot = path->slots[0]; 951c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 952c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 953c5c9cd4dSSage Weil size); 954c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 955c5c9cd4dSSage Weil } 956c5c9cd4dSSage Weil 957c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 958c5c9cd4dSSage Weil } 959c5c9cd4dSSage Weil 960c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) { 961c5c9cd4dSSage Weil u32 size; 962c5c9cd4dSSage Weil struct btrfs_key new_key; 963c5c9cd4dSSage Weil u64 coverslen; 964c5c9cd4dSSage Weil int coff, clen; 965c5c9cd4dSSage Weil 966c5c9cd4dSSage Weil size = btrfs_item_size_nr(leaf, slot); 967c5c9cd4dSSage Weil coverslen = (size / BTRFS_CRC32_SIZE) << 968c5c9cd4dSSage Weil root->fs_info->sb->s_blocksize_bits; 969c5c9cd4dSSage Weil printk("csums for %llu~%llu\n", 970c5c9cd4dSSage Weil key.offset, coverslen); 971c5c9cd4dSSage Weil if (key.offset + coverslen < off || 972c5c9cd4dSSage Weil key.offset >= off+len) 973c5c9cd4dSSage Weil goto next; 974c5c9cd4dSSage Weil 975c5c9cd4dSSage Weil read_extent_buffer(leaf, buf, 976c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 977c5c9cd4dSSage Weil size); 978c5c9cd4dSSage Weil btrfs_release_path(root, path); 979c5c9cd4dSSage Weil 980c5c9cd4dSSage Weil coff = 0; 981c5c9cd4dSSage Weil if (off > key.offset) 982c5c9cd4dSSage Weil coff = ((off - key.offset) >> 983c5c9cd4dSSage Weil root->fs_info->sb->s_blocksize_bits) * 984c5c9cd4dSSage Weil BTRFS_CRC32_SIZE; 985c5c9cd4dSSage Weil clen = size - coff; 986c5c9cd4dSSage Weil if (key.offset + coverslen > off+len) 987c5c9cd4dSSage Weil clen -= ((key.offset+coverslen-off-len) >> 988c5c9cd4dSSage Weil root->fs_info->sb->s_blocksize_bits) * 989c5c9cd4dSSage Weil BTRFS_CRC32_SIZE; 990c5c9cd4dSSage Weil printk(" will dup %d~%d of %d\n", 991c5c9cd4dSSage Weil coff, clen, size); 992c5c9cd4dSSage Weil 993c5c9cd4dSSage Weil memcpy(&new_key, &key, sizeof(new_key)); 994c5c9cd4dSSage Weil new_key.objectid = inode->i_ino; 995c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 996c5c9cd4dSSage Weil 997c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 998c5c9cd4dSSage Weil &new_key, clen); 999c5c9cd4dSSage Weil if (ret) 1000c5c9cd4dSSage Weil goto out; 1001c5c9cd4dSSage Weil 1002c5c9cd4dSSage Weil leaf = path->nodes[0]; 1003c5c9cd4dSSage Weil slot = path->slots[0]; 1004c5c9cd4dSSage Weil write_extent_buffer(leaf, buf + coff, 1005c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 1006c5c9cd4dSSage Weil clen); 1007c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 1008c5c9cd4dSSage Weil } 1009c5c9cd4dSSage Weil 1010c5c9cd4dSSage Weil next: 101131840ae1SZheng Yan btrfs_release_path(root, path); 1012ae01a0abSYan Zheng key.offset++; 1013ae01a0abSYan Zheng } 1014f46b5a66SChristoph Hellwig ret = 0; 1015f46b5a66SChristoph Hellwig out: 1016ae01a0abSYan Zheng btrfs_release_path(root, path); 1017ae01a0abSYan Zheng if (ret == 0) { 1018ae01a0abSYan Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 1019c5c9cd4dSSage Weil if (destoff + olen > inode->i_size) 1020c5c9cd4dSSage Weil btrfs_i_size_write(inode, destoff + olen); 1021ae01a0abSYan Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 1022ae01a0abSYan Zheng ret = btrfs_update_inode(trans, root, inode); 1023ae01a0abSYan Zheng } 1024f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 1025c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1026ae01a0abSYan Zheng if (ret) 1027ae01a0abSYan Zheng vmtruncate(inode, 0); 1028f46b5a66SChristoph Hellwig out_unlock: 1029f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 1030f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 1031ae01a0abSYan Zheng vfree(buf); 1032ae01a0abSYan Zheng btrfs_free_path(path); 1033f46b5a66SChristoph Hellwig out_fput: 1034f46b5a66SChristoph Hellwig fput(src_file); 1035f46b5a66SChristoph Hellwig return ret; 1036f46b5a66SChristoph Hellwig } 1037f46b5a66SChristoph Hellwig 1038b2950863SChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, unsigned long argptr) 1039c5c9cd4dSSage Weil { 1040c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 1041c5c9cd4dSSage Weil 1042c5c9cd4dSSage Weil if (copy_from_user(&args, (void *)argptr, sizeof(args))) 1043c5c9cd4dSSage Weil return -EFAULT; 1044c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 1045c5c9cd4dSSage Weil args.src_length, args.dest_offset); 1046c5c9cd4dSSage Weil } 1047c5c9cd4dSSage Weil 1048f46b5a66SChristoph Hellwig /* 1049f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1050f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1051f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1052f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1053f46b5a66SChristoph Hellwig */ 1054b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 1055f46b5a66SChristoph Hellwig { 1056f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1057f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1058f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1059f46b5a66SChristoph Hellwig int ret = 0; 1060f46b5a66SChristoph Hellwig 1061df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 1062df5b5520SChristoph Hellwig return -EPERM; 1063df5b5520SChristoph Hellwig 1064f46b5a66SChristoph Hellwig if (file->private_data) { 1065f46b5a66SChristoph Hellwig ret = -EINPROGRESS; 1066f46b5a66SChristoph Hellwig goto out; 1067f46b5a66SChristoph Hellwig } 10689ca9ee09SSage Weil 1069c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1070c146afadSYan Zheng if (ret) 1071c146afadSYan Zheng goto out; 1072c146afadSYan Zheng 10739ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 10749ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 10759ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 10769ca9ee09SSage Weil 10779ca9ee09SSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 1078f46b5a66SChristoph Hellwig if (trans) 1079f46b5a66SChristoph Hellwig file->private_data = trans; 1080f46b5a66SChristoph Hellwig else 1081f46b5a66SChristoph Hellwig ret = -ENOMEM; 1082f46b5a66SChristoph Hellwig /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/ 1083f46b5a66SChristoph Hellwig out: 1084f46b5a66SChristoph Hellwig return ret; 1085f46b5a66SChristoph Hellwig } 1086f46b5a66SChristoph Hellwig 1087f46b5a66SChristoph Hellwig /* 1088f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 1089f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 1090f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 1091f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 1092f46b5a66SChristoph Hellwig */ 1093f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 1094f46b5a66SChristoph Hellwig { 1095f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1096f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1097f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1098f46b5a66SChristoph Hellwig int ret = 0; 1099f46b5a66SChristoph Hellwig 1100f46b5a66SChristoph Hellwig trans = file->private_data; 1101f46b5a66SChristoph Hellwig if (!trans) { 1102f46b5a66SChristoph Hellwig ret = -EINVAL; 1103f46b5a66SChristoph Hellwig goto out; 1104f46b5a66SChristoph Hellwig } 1105f46b5a66SChristoph Hellwig btrfs_end_transaction(trans, root); 1106b214107eSChristoph Hellwig file->private_data = NULL; 11079ca9ee09SSage Weil 11089ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 11099ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 11109ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 11119ca9ee09SSage Weil 1112f46b5a66SChristoph Hellwig out: 1113f46b5a66SChristoph Hellwig return ret; 1114f46b5a66SChristoph Hellwig } 1115f46b5a66SChristoph Hellwig 1116f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 1117f46b5a66SChristoph Hellwig cmd, unsigned long arg) 1118f46b5a66SChristoph Hellwig { 1119f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 1120*4bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 1121f46b5a66SChristoph Hellwig 1122f46b5a66SChristoph Hellwig switch (cmd) { 1123f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 1124*4bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 0); 11253de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 1126*4bcabaa3SChristoph Hellwig return btrfs_ioctl_snap_create(file, argp, 1); 1127f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 1128f46b5a66SChristoph Hellwig return btrfs_ioctl_defrag(file); 1129f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 1130*4bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 1131f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 1132*4bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 1133f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 1134*4bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 1135f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 1136f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 1137f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 1138c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 1139c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 1140c5c9cd4dSSage Weil return btrfs_ioctl_clone_range(file, arg); 1141f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 1142f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 1143f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 1144f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 1145f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 1146f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 1147f46b5a66SChristoph Hellwig return 0; 1148f46b5a66SChristoph Hellwig } 1149f46b5a66SChristoph Hellwig 1150f46b5a66SChristoph Hellwig return -ENOTTY; 1151f46b5a66SChristoph Hellwig } 1152