fs/btrfs/ioctl.c

   1 /*
   2  * Copyright (C) 2007 Oracle.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/bio.h>
  21 #include <linux/buffer_head.h>
  22 #include <linux/file.h>
  23 #include <linux/fs.h>
  24 #include <linux/fsnotify.h>
  25 #include <linux/pagemap.h>
  26 #include <linux/highmem.h>
  27 #include <linux/time.h>
  28 #include <linux/init.h>
  29 #include <linux/string.h>
  30 #include <linux/backing-dev.h>
  31 #include <linux/mount.h>
  32 #include <linux/mpage.h>
  33 #include <linux/namei.h>
  34 #include <linux/swap.h>
  35 #include <linux/writeback.h>
  36 #include <linux/statfs.h>
  37 #include <linux/compat.h>
  38 #include <linux/bit_spinlock.h>
  39 #include <linux/security.h>
  40 #include <linux/xattr.h>
  41 #include <linux/vmalloc.h>
  42 #include "compat.h"
  43 #include "ctree.h"
  44 #include "disk-io.h"
  45 #include "transaction.h"
  46 #include "btrfs_inode.h"
  47 #include "ioctl.h"
  48 #include "print-tree.h"
  49 #include "volumes.h"
  50 #include "locking.h"
  51
  52 /* Mask out flags that are inappropriate for the given type of inode. */
  53 static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
  54 {
  55         if (S_ISDIR(mode))
  56                 return flags;
  57         else if (S_ISREG(mode))
  58                 return flags & ~FS_DIRSYNC_FL;
  59         else
  60                 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
  61 }
  62
  63 /*
  64  * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
  65  */
  66 static unsigned int btrfs_flags_to_ioctl(unsigned int flags)
  67 {
  68         unsigned int iflags = 0;
  69
  70         if (flags & BTRFS_INODE_SYNC)
  71                 iflags |= FS_SYNC_FL;
  72         if (flags & BTRFS_INODE_IMMUTABLE)
  73                 iflags |= FS_IMMUTABLE_FL;
  74         if (flags & BTRFS_INODE_APPEND)
  75                 iflags |= FS_APPEND_FL;
  76         if (flags & BTRFS_INODE_NODUMP)
  77                 iflags |= FS_NODUMP_FL;
  78         if (flags & BTRFS_INODE_NOATIME)
  79                 iflags |= FS_NOATIME_FL;
  80         if (flags & BTRFS_INODE_DIRSYNC)
  81                 iflags |= FS_DIRSYNC_FL;
  82
  83         return iflags;
  84 }
  85
  86 /*
  87  * Update inode->i_flags based on the btrfs internal flags.
  88  */
  89 void btrfs_update_iflags(struct inode *inode)
  90 {
  91         struct btrfs_inode *ip = BTRFS_I(inode);
  92
  93         inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
  94
  95         if (ip->flags & BTRFS_INODE_SYNC)
  96                 inode->i_flags |= S_SYNC;
  97         if (ip->flags & BTRFS_INODE_IMMUTABLE)
  98                 inode->i_flags |= S_IMMUTABLE;
  99         if (ip->flags & BTRFS_INODE_APPEND)
 100                 inode->i_flags |= S_APPEND;
 101         if (ip->flags & BTRFS_INODE_NOATIME)
 102                 inode->i_flags |= S_NOATIME;
 103         if (ip->flags & BTRFS_INODE_DIRSYNC)
 104                 inode->i_flags |= S_DIRSYNC;
 105 }
 106
 107 /*
 108  * Inherit flags from the parent inode.
 109  *
 110  * Unlike extN we don't have any flags we don't want to inherit currently.
 111  */
 112 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
 113 {
 114         unsigned int flags;
 115
 116         if (!dir)
 117                 return;
 118
 119         flags = BTRFS_I(dir)->flags;
 120
 121         if (S_ISREG(inode->i_mode))
 122                 flags &= ~BTRFS_INODE_DIRSYNC;
 123         else if (!S_ISDIR(inode->i_mode))
 124                 flags &= (BTRFS_INODE_NODUMP | BTRFS_INODE_NOATIME);
 125
 126         BTRFS_I(inode)->flags = flags;
 127         btrfs_update_iflags(inode);
 128 }
 129
 130 static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
 131 {
 132         struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode);
 133         unsigned int flags = btrfs_flags_to_ioctl(ip->flags);
 134
 135         if (copy_to_user(arg, &flags, sizeof(flags)))
 136                 return -EFAULT;
 137         return 0;
 138 }
 139
 140 static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
 141 {
 142         struct inode *inode = file->f_path.dentry->d_inode;
 143         struct btrfs_inode *ip = BTRFS_I(inode);
 144         struct btrfs_root *root = ip->root;
 145         struct btrfs_trans_handle *trans;
 146         unsigned int flags, oldflags;
 147         int ret;
 148
 149         if (copy_from_user(&flags, arg, sizeof(flags)))
 150                 return -EFAULT;
 151
 152         if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
 153                       FS_NOATIME_FL | FS_NODUMP_FL | \
 154                       FS_SYNC_FL | FS_DIRSYNC_FL))
 155                 return -EOPNOTSUPP;
 156
 157         if (!is_owner_or_cap(inode))
 158                 return -EACCES;
 159
 160         mutex_lock(&inode->i_mutex);
 161
 162         flags = btrfs_mask_flags(inode->i_mode, flags);
 163         oldflags = btrfs_flags_to_ioctl(ip->flags);
 164         if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
 165                 if (!capable(CAP_LINUX_IMMUTABLE)) {
 166                         ret = -EPERM;
 167                         goto out_unlock;
 168                 }
 169         }
 170
 171         ret = mnt_want_write(file->f_path.mnt);
 172         if (ret)
 173                 goto out_unlock;
 174
 175         if (flags & FS_SYNC_FL)
 176                 ip->flags |= BTRFS_INODE_SYNC;
 177         else
 178                 ip->flags &= ~BTRFS_INODE_SYNC;
 179         if (flags & FS_IMMUTABLE_FL)
 180                 ip->flags |= BTRFS_INODE_IMMUTABLE;
 181         else
 182                 ip->flags &= ~BTRFS_INODE_IMMUTABLE;
 183         if (flags & FS_APPEND_FL)
 184                 ip->flags |= BTRFS_INODE_APPEND;
 185         else
 186                 ip->flags &= ~BTRFS_INODE_APPEND;
 187         if (flags & FS_NODUMP_FL)
 188                 ip->flags |= BTRFS_INODE_NODUMP;
 189         else
 190                 ip->flags &= ~BTRFS_INODE_NODUMP;
 191         if (flags & FS_NOATIME_FL)
 192                 ip->flags |= BTRFS_INODE_NOATIME;
 193         else
 194                 ip->flags &= ~BTRFS_INODE_NOATIME;
 195         if (flags & FS_DIRSYNC_FL)
 196                 ip->flags |= BTRFS_INODE_DIRSYNC;
 197         else
 198                 ip->flags &= ~BTRFS_INODE_DIRSYNC;
 199
 200
 201         trans = btrfs_join_transaction(root, 1);
 202         BUG_ON(!trans);
 203
 204         ret = btrfs_update_inode(trans, root, inode);
 205         BUG_ON(ret);
 206
 207         btrfs_update_iflags(inode);
 208         inode->i_ctime = CURRENT_TIME;
 209         btrfs_end_transaction(trans, root);
 210
 211         mnt_drop_write(file->f_path.mnt);
 212  out_unlock:
 213         mutex_unlock(&inode->i_mutex);
 214         return 0;
 215 }
 216
 217 static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
 218 {
 219         struct inode *inode = file->f_path.dentry->d_inode;
 220
 221         return put_user(inode->i_generation, arg);
 222 }
 223
 224 static noinline int create_subvol(struct btrfs_root *root,
 225                                   struct dentry *dentry,
 226                                   char *name, int namelen)
 227 {
 228         struct btrfs_trans_handle *trans;
 229         struct btrfs_key key;
 230         struct btrfs_root_item root_item;
 231         struct btrfs_inode_item *inode_item;
 232         struct extent_buffer *leaf;
 233         struct btrfs_root *new_root;
 234         struct inode *dir = dentry->d_parent->d_inode;
 235         int ret;
 236         int err;
 237         u64 objectid;
 238         u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
 239         u64 index = 0;
 240         unsigned long nr = 1;
 241
 242         /*
 243          * 1 - inode item
 244          * 2 - refs
 245          * 1 - root item
 246          * 2 - dir items
 247          */
 248         ret = btrfs_reserve_metadata_space(root, 6);
 249         if (ret)
 250                 return ret;
 251
 252         trans = btrfs_start_transaction(root, 1);
 253         BUG_ON(!trans);
 254
 255         ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
 256                                        0, &objectid);
 257         if (ret)
 258                 goto fail;
 259
 260         leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
 261                                       0, objectid, NULL, 0, 0, 0);
 262         if (IS_ERR(leaf)) {
 263                 ret = PTR_ERR(leaf);
 264                 goto fail;
 265         }
 266
 267         memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
 268         btrfs_set_header_bytenr(leaf, leaf->start);
 269         btrfs_set_header_generation(leaf, trans->transid);
 270         btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
 271         btrfs_set_header_owner(leaf, objectid);
 272
 273         write_extent_buffer(leaf, root->fs_info->fsid,
 274                             (unsigned long)btrfs_header_fsid(leaf),
 275                             BTRFS_FSID_SIZE);
 276         write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
 277                             (unsigned long)btrfs_header_chunk_tree_uuid(leaf),
 278                             BTRFS_UUID_SIZE);
 279         btrfs_mark_buffer_dirty(leaf);
 280
 281         inode_item = &root_item.inode;
 282         memset(inode_item, 0, sizeof(*inode_item));
 283         inode_item->generation = cpu_to_le64(1);
 284         inode_item->size = cpu_to_le64(3);
 285         inode_item->nlink = cpu_to_le32(1);
 286         inode_item->nbytes = cpu_to_le64(root->leafsize);
 287         inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
 288
 289         btrfs_set_root_bytenr(&root_item, leaf->start);
 290         btrfs_set_root_generation(&root_item, trans->transid);
 291         btrfs_set_root_level(&root_item, 0);
 292         btrfs_set_root_refs(&root_item, 1);
 293         btrfs_set_root_used(&root_item, 0);
 294         btrfs_set_root_last_snapshot(&root_item, 0);
 295
 296         memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
 297         root_item.drop_level = 0;
 298
 299         btrfs_tree_unlock(leaf);
 300         free_extent_buffer(leaf);
 301         leaf = NULL;
 302
 303         btrfs_set_root_dirid(&root_item, new_dirid);
 304
 305         key.objectid = objectid;
 306         key.offset = 0;
 307         btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
 308         ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
 309                                 &root_item);
 310         if (ret)
 311                 goto fail;
 312
 313         key.offset = (u64)-1;
 314         new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
 315         BUG_ON(IS_ERR(new_root));
 316
 317         btrfs_record_root_in_trans(trans, new_root);
 318
 319         ret = btrfs_create_subvol_root(trans, new_root, new_dirid,
 320                                        BTRFS_I(dir)->block_group);
 321         /*
 322          * insert the directory item
 323          */
 324         ret = btrfs_set_inode_index(dir, &index);
 325         BUG_ON(ret);
 326
 327         ret = btrfs_insert_dir_item(trans, root,
 328                                     name, namelen, dir->i_ino, &key,
 329                                     BTRFS_FT_DIR, index);
 330         if (ret)
 331                 goto fail;
 332
 333         btrfs_i_size_write(dir, dir->i_size + namelen * 2);
 334         ret = btrfs_update_inode(trans, root, dir);
 335         BUG_ON(ret);
 336
 337         ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
 338                                  objectid, root->root_key.objectid,
 339                                  dir->i_ino, index, name, namelen);
 340
 341         BUG_ON(ret);
 342
 343         d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
 344 fail:
 345         nr = trans->blocks_used;
 346         err = btrfs_commit_transaction(trans, root);
 347         if (err && !ret)
 348                 ret = err;
 349
 350         btrfs_unreserve_metadata_space(root, 6);
 351         btrfs_btree_balance_dirty(root, nr);
 352         return ret;
 353 }
 354
 355 static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
 356                            char *name, int namelen)
 357 {
 358         struct btrfs_pending_snapshot *pending_snapshot;
 359         struct btrfs_trans_handle *trans;
 360         int ret = 0;
 361         int err;
 362         unsigned long nr = 0;
 363
 364         if (!root->ref_cows)
 365                 return -EINVAL;
 366
 367         /*
 368          * 1 - inode item
 369          * 2 - refs
 370          * 1 - root item
 371          * 2 - dir items
 372          */
 373         ret = btrfs_reserve_metadata_space(root, 6);
 374         if (ret)
 375                 goto fail_unlock;
 376
 377         pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
 378         if (!pending_snapshot) {
 379                 ret = -ENOMEM;
 380                 btrfs_unreserve_metadata_space(root, 6);
 381                 goto fail_unlock;
 382         }
 383         pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
 384         if (!pending_snapshot->name) {
 385                 ret = -ENOMEM;
 386                 kfree(pending_snapshot);
 387                 btrfs_unreserve_metadata_space(root, 6);
 388                 goto fail_unlock;
 389         }
 390         memcpy(pending_snapshot->name, name, namelen);
 391         pending_snapshot->name[namelen] = '\0';
 392         pending_snapshot->dentry = dentry;
 393         trans = btrfs_start_transaction(root, 1);
 394         BUG_ON(!trans);
 395         pending_snapshot->root = root;
 396         list_add(&pending_snapshot->list,
 397                  &trans->transaction->pending_snapshots);
 398         err = btrfs_commit_transaction(trans, root);
 399
 400 fail_unlock:
 401         btrfs_btree_balance_dirty(root, nr);
 402         return ret;
 403 }
 404
 405 /* copy of may_create in fs/namei.c() */
 406 static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
 407 {
 408         if (child->d_inode)
 409                 return -EEXIST;
 410         if (IS_DEADDIR(dir))
 411                 return -ENOENT;
 412         return inode_permission(dir, MAY_WRITE | MAY_EXEC);
 413 }
 414
 415 /*
 416  * Create a new subvolume below @parent.  This is largely modeled after
 417  * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
 418  * inside this filesystem so it's quite a bit simpler.
 419  */
 420 static noinline int btrfs_mksubvol(struct path *parent,
 421                                    char *name, int namelen,
 422                                    struct btrfs_root *snap_src)
 423 {
 424         struct inode *dir  = parent->dentry->d_inode;
 425         struct dentry *dentry;
 426         int error;
 427
 428         mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
 429
 430         dentry = lookup_one_len(name, parent->dentry, namelen);
 431         error = PTR_ERR(dentry);
 432         if (IS_ERR(dentry))
 433                 goto out_unlock;
 434
 435         error = -EEXIST;
 436         if (dentry->d_inode)
 437                 goto out_dput;
 438
 439         error = mnt_want_write(parent->mnt);
 440         if (error)
 441                 goto out_dput;
 442
 443         error = btrfs_may_create(dir, dentry);
 444         if (error)
 445                 goto out_drop_write;
 446
 447         down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
 448
 449         if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
 450                 goto out_up_read;
 451
 452         if (snap_src) {
 453                 error = create_snapshot(snap_src, dentry,
 454                                         name, namelen);
 455         } else {
 456                 error = create_subvol(BTRFS_I(dir)->root, dentry,
 457                                       name, namelen);
 458         }
 459         if (!error)
 460                 fsnotify_mkdir(dir, dentry);
 461 out_up_read:
 462         up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
 463 out_drop_write:
 464         mnt_drop_write(parent->mnt);
 465 out_dput:
 466         dput(dentry);
 467 out_unlock:
 468         mutex_unlock(&dir->i_mutex);
 469         return error;
 470 }
 471
 472 static int btrfs_defrag_file(struct file *file)
 473 {
 474         struct inode *inode = fdentry(file)->d_inode;
 475         struct btrfs_root *root = BTRFS_I(inode)->root;
 476         struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
 477         struct btrfs_ordered_extent *ordered;
 478         struct page *page;
 479         unsigned long last_index;
 480         unsigned long ra_pages = root->fs_info->bdi.ra_pages;
 481         unsigned long total_read = 0;
 482         u64 page_start;
 483         u64 page_end;
 484         unsigned long i;
 485         int ret;
 486
 487         ret = btrfs_check_data_free_space(root, inode, inode->i_size);
 488         if (ret)
 489                 return -ENOSPC;
 490
 491         mutex_lock(&inode->i_mutex);
 492         last_index = inode->i_size >> PAGE_CACHE_SHIFT;
 493         for (i = 0; i <= last_index; i++) {
 494                 if (total_read % ra_pages == 0) {
 495                         btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i,
 496                                        min(last_index, i + ra_pages - 1));
 497                 }
 498                 total_read++;
 499 again:
 500                 page = grab_cache_page(inode->i_mapping, i);
 501                 if (!page)
 502                         goto out_unlock;
 503                 if (!PageUptodate(page)) {
 504                         btrfs_readpage(NULL, page);
 505                         lock_page(page);
 506                         if (!PageUptodate(page)) {
 507                                 unlock_page(page);
 508                                 page_cache_release(page);
 509                                 goto out_unlock;
 510                         }
 511                 }
 512
 513                 wait_on_page_writeback(page);
 514
 515                 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
 516                 page_end = page_start + PAGE_CACHE_SIZE - 1;
 517                 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
 518
 519                 ordered = btrfs_lookup_ordered_extent(inode, page_start);
 520                 if (ordered) {
 521                         unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
 522                         unlock_page(page);
 523                         page_cache_release(page);
 524                         btrfs_start_ordered_extent(inode, ordered, 1);
 525                         btrfs_put_ordered_extent(ordered);
 526                         goto again;
 527                 }
 528                 set_page_extent_mapped(page);
 529
 530                 /*
 531                  * this makes sure page_mkwrite is called on the
 532                  * page if it is dirtied again later
 533                  */
 534                 clear_page_dirty_for_io(page);
 535
 536                 btrfs_set_extent_delalloc(inode, page_start, page_end);
 537                 set_page_dirty(page);
 538                 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
 539                 unlock_page(page);
 540                 page_cache_release(page);
 541                 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
 542         }
 543
 544 out_unlock:
 545         mutex_unlock(&inode->i_mutex);
 546         return 0;
 547 }
 548
 549 static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
 550                                         void __user *arg)
 551 {
 552         u64 new_size;
 553         u64 old_size;
 554         u64 devid = 1;
 555         struct btrfs_ioctl_vol_args *vol_args;
 556         struct btrfs_trans_handle *trans;
 557         struct btrfs_device *device = NULL;
 558         char *sizestr;
 559         char *devstr = NULL;
 560         int ret = 0;
 561         int namelen;
 562         int mod = 0;
 563
 564         if (root->fs_info->sb->s_flags & MS_RDONLY)
 565                 return -EROFS;
 566
 567         if (!capable(CAP_SYS_ADMIN))
 568                 return -EPERM;
 569
 570         vol_args = memdup_user(arg, sizeof(*vol_args));
 571         if (IS_ERR(vol_args))
 572                 return PTR_ERR(vol_args);
 573
 574         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
 575         namelen = strlen(vol_args->name);
 576
 577         mutex_lock(&root->fs_info->volume_mutex);
 578         sizestr = vol_args->name;
 579         devstr = strchr(sizestr, ':');
 580         if (devstr) {
 581                 char *end;
 582                 sizestr = devstr + 1;
 583                 *devstr = '\0';
 584                 devstr = vol_args->name;
 585                 devid = simple_strtoull(devstr, &end, 10);
 586                 printk(KERN_INFO "resizing devid %llu\n",
 587                        (unsigned long long)devid);
 588         }
 589         device = btrfs_find_device(root, devid, NULL, NULL);
 590         if (!device) {
 591                 printk(KERN_INFO "resizer unable to find device %llu\n",
 592                        (unsigned long long)devid);
 593                 ret = -EINVAL;
 594                 goto out_unlock;
 595         }
 596         if (!strcmp(sizestr, "max"))
 597                 new_size = device->bdev->bd_inode->i_size;
 598         else {
 599                 if (sizestr[0] == '-') {
 600                         mod = -1;
 601                         sizestr++;
 602                 } else if (sizestr[0] == '+') {
 603                         mod = 1;
 604                         sizestr++;
 605                 }
 606                 new_size = btrfs_parse_size(sizestr);
 607                 if (new_size == 0) {
 608                         ret = -EINVAL;
 609                         goto out_unlock;
 610                 }
 611         }
 612
 613         old_size = device->total_bytes;
 614
 615         if (mod < 0) {
 616                 if (new_size > old_size) {
 617                         ret = -EINVAL;
 618                         goto out_unlock;
 619                 }
 620                 new_size = old_size - new_size;
 621         } else if (mod > 0) {
 622                 new_size = old_size + new_size;
 623         }
 624
 625         if (new_size < 256 * 1024 * 1024) {
 626                 ret = -EINVAL;
 627                 goto out_unlock;
 628         }
 629         if (new_size > device->bdev->bd_inode->i_size) {
 630                 ret = -EFBIG;
 631                 goto out_unlock;
 632         }
 633
 634         do_div(new_size, root->sectorsize);
 635         new_size *= root->sectorsize;
 636
 637         printk(KERN_INFO "new size for %s is %llu\n",
 638                 device->name, (unsigned long long)new_size);
 639
 640         if (new_size > old_size) {
 641                 trans = btrfs_start_transaction(root, 1);
 642                 ret = btrfs_grow_device(trans, device, new_size);
 643                 btrfs_commit_transaction(trans, root);
 644         } else {
 645                 ret = btrfs_shrink_device(device, new_size);
 646         }
 647
 648 out_unlock:
 649         mutex_unlock(&root->fs_info->volume_mutex);
 650         kfree(vol_args);
 651         return ret;
 652 }
 653
 654 static noinline int btrfs_ioctl_snap_create(struct file *file,
 655                                             void __user *arg, int subvol)
 656 {
 657         struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
 658         struct btrfs_ioctl_vol_args *vol_args;
 659         struct file *src_file;
 660         int namelen;
 661         int ret = 0;
 662
 663         if (root->fs_info->sb->s_flags & MS_RDONLY)
 664                 return -EROFS;
 665
 666         vol_args = memdup_user(arg, sizeof(*vol_args));
 667         if (IS_ERR(vol_args))
 668                 return PTR_ERR(vol_args);
 669
 670         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
 671         namelen = strlen(vol_args->name);
 672         if (strchr(vol_args->name, '/')) {
 673                 ret = -EINVAL;
 674                 goto out;
 675         }
 676
 677         if (subvol) {
 678                 ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen,
 679                                      NULL);
 680         } else {
 681                 struct inode *src_inode;
 682                 src_file = fget(vol_args->fd);
 683                 if (!src_file) {
 684                         ret = -EINVAL;
 685                         goto out;
 686                 }
 687
 688                 src_inode = src_file->f_path.dentry->d_inode;
 689                 if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) {
 690                         printk(KERN_INFO "btrfs: Snapshot src from "
 691                                "another FS\n");
 692                         ret = -EINVAL;
 693                         fput(src_file);
 694                         goto out;
 695                 }
 696                 ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen,
 697                                      BTRFS_I(src_inode)->root);
 698                 fput(src_file);
 699         }
 700 out:
 701         kfree(vol_args);
 702         return ret;
 703 }
 704
 705 /*
 706  * helper to check if the subvolume references other subvolumes
 707  */
 708 static noinline int may_destroy_subvol(struct btrfs_root *root)
 709 {
 710         struct btrfs_path *path;
 711         struct btrfs_key key;
 712         int ret;
 713
 714         path = btrfs_alloc_path();
 715         if (!path)
 716                 return -ENOMEM;
 717
 718         key.objectid = root->root_key.objectid;
 719         key.type = BTRFS_ROOT_REF_KEY;
 720         key.offset = (u64)-1;
 721
 722         ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
 723                                 &key, path, 0, 0);
 724         if (ret < 0)
 725                 goto out;
 726         BUG_ON(ret == 0);
 727
 728         ret = 0;
 729         if (path->slots[0] > 0) {
 730                 path->slots[0]--;
 731                 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
 732                 if (key.objectid == root->root_key.objectid &&
 733                     key.type == BTRFS_ROOT_REF_KEY)
 734                         ret = -ENOTEMPTY;
 735         }
 736 out:
 737         btrfs_free_path(path);
 738         return ret;
 739 }
 740
 741 static noinline int btrfs_ioctl_snap_destroy(struct file *file,
 742                                              void __user *arg)
 743 {
 744         struct dentry *parent = fdentry(file);
 745         struct dentry *dentry;
 746         struct inode *dir = parent->d_inode;
 747         struct inode *inode;
 748         struct btrfs_root *root = BTRFS_I(dir)->root;
 749         struct btrfs_root *dest = NULL;
 750         struct btrfs_ioctl_vol_args *vol_args;
 751         struct btrfs_trans_handle *trans;
 752         int namelen;
 753         int ret;
 754         int err = 0;
 755
 756         if (!capable(CAP_SYS_ADMIN))
 757                 return -EPERM;
 758
 759         vol_args = memdup_user(arg, sizeof(*vol_args));
 760         if (IS_ERR(vol_args))
 761                 return PTR_ERR(vol_args);
 762
 763         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
 764         namelen = strlen(vol_args->name);
 765         if (strchr(vol_args->name, '/') ||
 766             strncmp(vol_args->name, "..", namelen) == 0) {
 767                 err = -EINVAL;
 768                 goto out;
 769         }
 770
 771         err = mnt_want_write(file->f_path.mnt);
 772         if (err)
 773                 goto out;
 774
 775         mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
 776         dentry = lookup_one_len(vol_args->name, parent, namelen);
 777         if (IS_ERR(dentry)) {
 778                 err = PTR_ERR(dentry);
 779                 goto out_unlock_dir;
 780         }
 781
 782         if (!dentry->d_inode) {
 783                 err = -ENOENT;
 784                 goto out_dput;
 785         }
 786
 787         inode = dentry->d_inode;
 788         if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) {
 789                 err = -EINVAL;
 790                 goto out_dput;
 791         }
 792
 793         dest = BTRFS_I(inode)->root;
 794
 795         mutex_lock(&inode->i_mutex);
 796         err = d_invalidate(dentry);
 797         if (err)
 798                 goto out_unlock;
 799
 800         down_write(&root->fs_info->subvol_sem);
 801
 802         err = may_destroy_subvol(dest);
 803         if (err)
 804                 goto out_up_write;
 805
 806         trans = btrfs_start_transaction(root, 1);
 807         ret = btrfs_unlink_subvol(trans, root, dir,
 808                                 dest->root_key.objectid,
 809                                 dentry->d_name.name,
 810                                 dentry->d_name.len);
 811         BUG_ON(ret);
 812
 813         btrfs_record_root_in_trans(trans, dest);
 814
 815         memset(&dest->root_item.drop_progress, 0,
 816                 sizeof(dest->root_item.drop_progress));
 817         dest->root_item.drop_level = 0;
 818         btrfs_set_root_refs(&dest->root_item, 0);
 819
 820         ret = btrfs_insert_orphan_item(trans,
 821                                 root->fs_info->tree_root,
 822                                 dest->root_key.objectid);
 823         BUG_ON(ret);
 824
 825         ret = btrfs_commit_transaction(trans, root);
 826         BUG_ON(ret);
 827         inode->i_flags |= S_DEAD;
 828 out_up_write:
 829         up_write(&root->fs_info->subvol_sem);
 830 out_unlock:
 831         mutex_unlock(&inode->i_mutex);
 832         if (!err) {
 833                 btrfs_invalidate_inodes(dest);
 834                 d_delete(dentry);
 835         }
 836 out_dput:
 837         dput(dentry);
 838 out_unlock_dir:
 839         mutex_unlock(&dir->i_mutex);
 840         mnt_drop_write(file->f_path.mnt);
 841 out:
 842         kfree(vol_args);
 843         return err;
 844 }
 845
 846 static int btrfs_ioctl_defrag(struct file *file)
 847 {
 848         struct inode *inode = fdentry(file)->d_inode;
 849         struct btrfs_root *root = BTRFS_I(inode)->root;
 850         int ret;
 851
 852         ret = mnt_want_write(file->f_path.mnt);
 853         if (ret)
 854                 return ret;
 855
 856         switch (inode->i_mode & S_IFMT) {
 857         case S_IFDIR:
 858                 if (!capable(CAP_SYS_ADMIN)) {
 859                         ret = -EPERM;
 860                         goto out;
 861                 }
 862                 btrfs_defrag_root(root, 0);
 863                 btrfs_defrag_root(root->fs_info->extent_root, 0);
 864                 break;
 865         case S_IFREG:
 866                 if (!(file->f_mode & FMODE_WRITE)) {
 867                         ret = -EINVAL;
 868                         goto out;
 869                 }
 870                 btrfs_defrag_file(file);
 871                 break;
 872         }
 873 out:
 874         mnt_drop_write(file->f_path.mnt);
 875         return ret;
 876 }
 877
 878 static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
 879 {
 880         struct btrfs_ioctl_vol_args *vol_args;
 881         int ret;
 882
 883         if (!capable(CAP_SYS_ADMIN))
 884                 return -EPERM;
 885
 886         vol_args = memdup_user(arg, sizeof(*vol_args));
 887         if (IS_ERR(vol_args))
 888                 return PTR_ERR(vol_args);
 889
 890         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
 891         ret = btrfs_init_new_device(root, vol_args->name);
 892
 893         kfree(vol_args);
 894         return ret;
 895 }
 896
 897 static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
 898 {
 899         struct btrfs_ioctl_vol_args *vol_args;
 900         int ret;
 901
 902         if (!capable(CAP_SYS_ADMIN))
 903                 return -EPERM;
 904
 905         if (root->fs_info->sb->s_flags & MS_RDONLY)
 906                 return -EROFS;
 907
 908         vol_args = memdup_user(arg, sizeof(*vol_args));
 909         if (IS_ERR(vol_args))
 910                 return PTR_ERR(vol_args);
 911
 912         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
 913         ret = btrfs_rm_device(root, vol_args->name);
 914
 915         kfree(vol_args);
 916         return ret;
 917 }
 918
 919 static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
 920                                        u64 off, u64 olen, u64 destoff)
 921 {
 922         struct inode *inode = fdentry(file)->d_inode;
 923         struct btrfs_root *root = BTRFS_I(inode)->root;
 924         struct file *src_file;
 925         struct inode *src;
 926         struct btrfs_trans_handle *trans;
 927         struct btrfs_path *path;
 928         struct extent_buffer *leaf;
 929         char *buf;
 930         struct btrfs_key key;
 931         u32 nritems;
 932         int slot;
 933         int ret;
 934         u64 len = olen;
 935         u64 bs = root->fs_info->sb->s_blocksize;
 936         u64 hint_byte;
 937
 938         /*
 939          * TODO:
 940          * - split compressed inline extents.  annoying: we need to
 941          *   decompress into destination's address_space (the file offset
 942          *   may change, so source mapping won't do), then recompress (or
 943          *   otherwise reinsert) a subrange.
 944          * - allow ranges within the same file to be cloned (provided
 945          *   they don't overlap)?
 946          */
 947
 948         /* the destination must be opened for writing */
 949         if (!(file->f_mode & FMODE_WRITE))
 950                 return -EINVAL;
 951
 952         ret = mnt_want_write(file->f_path.mnt);
 953         if (ret)
 954                 return ret;
 955
 956         src_file = fget(srcfd);
 957         if (!src_file) {
 958                 ret = -EBADF;
 959                 goto out_drop_write;
 960         }
 961         src = src_file->f_dentry->d_inode;
 962
 963         ret = -EINVAL;
 964         if (src == inode)
 965                 goto out_fput;
 966
 967         ret = -EISDIR;
 968         if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
 969                 goto out_fput;
 970
 971         ret = -EXDEV;
 972         if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root)
 973                 goto out_fput;
 974
 975         ret = -ENOMEM;
 976         buf = vmalloc(btrfs_level_size(root, 0));
 977         if (!buf)
 978                 goto out_fput;
 979
 980         path = btrfs_alloc_path();
 981         if (!path) {
 982                 vfree(buf);
 983                 goto out_fput;
 984         }
 985         path->reada = 2;
 986
 987         if (inode < src) {
 988                 mutex_lock(&inode->i_mutex);
 989                 mutex_lock(&src->i_mutex);
 990         } else {
 991                 mutex_lock(&src->i_mutex);
 992                 mutex_lock(&inode->i_mutex);
 993         }
 994
 995         /* determine range to clone */
 996         ret = -EINVAL;
 997         if (off >= src->i_size || off + len > src->i_size)
 998                 goto out_unlock;
 999         if (len == 0)
1000                 olen = len = src->i_size - off;
1001         /* if we extend to eof, continue to block boundary */
1002         if (off + len == src->i_size)
1003                 len = ((src->i_size + bs-1) & ~(bs-1))
1004                         - off;
1005
1006         /* verify the end result is block aligned */
1007         if ((off & (bs-1)) ||
1008             ((off + len) & (bs-1)))
1009                 goto out_unlock;
1010
1011         /* do any pending delalloc/csum calc on src, one way or
1012            another, and lock file content */
1013         while (1) {
1014                 struct btrfs_ordered_extent *ordered;
1015                 lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
1016                 ordered = btrfs_lookup_first_ordered_extent(inode, off+len);
1017                 if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered)
1018                         break;
1019                 unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
1020                 if (ordered)
1021                         btrfs_put_ordered_extent(ordered);
1022                 btrfs_wait_ordered_range(src, off, off+len);
1023         }
1024
1025         trans = btrfs_start_transaction(root, 1);
1026         BUG_ON(!trans);
1027
1028         /* punch hole in destination first */
1029         btrfs_drop_extents(trans, root, inode, off, off + len,
1030                            off + len, 0, &hint_byte, 1);
1031
1032         /* clone data */
1033         key.objectid = src->i_ino;
1034         key.type = BTRFS_EXTENT_DATA_KEY;
1035         key.offset = 0;
1036
1037         while (1) {
1038                 /*
1039                  * note the key will change type as we walk through the
1040                  * tree.
1041                  */
1042                 ret = btrfs_search_slot(trans, root, &key, path, 0, 0);
1043                 if (ret < 0)
1044                         goto out;
1045
1046                 nritems = btrfs_header_nritems(path->nodes[0]);
1047                 if (path->slots[0] >= nritems) {
1048                         ret = btrfs_next_leaf(root, path);
1049                         if (ret < 0)
1050                                 goto out;
1051                         if (ret > 0)
1052                                 break;
1053                         nritems = btrfs_header_nritems(path->nodes[0]);
1054                 }
1055                 leaf = path->nodes[0];
1056                 slot = path->slots[0];
1057
1058                 btrfs_item_key_to_cpu(leaf, &key, slot);
1059                 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
1060                     key.objectid != src->i_ino)
1061                         break;
1062
1063                 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
1064                         struct btrfs_file_extent_item *extent;
1065                         int type;
1066                         u32 size;
1067                         struct btrfs_key new_key;
1068                         u64 disko = 0, diskl = 0;
1069                         u64 datao = 0, datal = 0;
1070                         u8 comp;
1071
1072                         size = btrfs_item_size_nr(leaf, slot);
1073                         read_extent_buffer(leaf, buf,
1074                                            btrfs_item_ptr_offset(leaf, slot),
1075                                            size);
1076
1077                         extent = btrfs_item_ptr(leaf, slot,
1078                                                 struct btrfs_file_extent_item);
1079                         comp = btrfs_file_extent_compression(leaf, extent);
1080                         type = btrfs_file_extent_type(leaf, extent);
1081                         if (type == BTRFS_FILE_EXTENT_REG ||
1082                             type == BTRFS_FILE_EXTENT_PREALLOC) {
1083                                 disko = btrfs_file_extent_disk_bytenr(leaf,
1084                                                                       extent);
1085                                 diskl = btrfs_file_extent_disk_num_bytes(leaf,
1086                                                                  extent);
1087                                 datao = btrfs_file_extent_offset(leaf, extent);
1088                                 datal = btrfs_file_extent_num_bytes(leaf,
1089                                                                     extent);
1090                         } else if (type == BTRFS_FILE_EXTENT_INLINE) {
1091                                 /* take upper bound, may be compressed */
1092                                 datal = btrfs_file_extent_ram_bytes(leaf,
1093                                                                     extent);
1094                         }
1095                         btrfs_release_path(root, path);
1096
1097                         if (key.offset + datal < off ||
1098                             key.offset >= off+len)
1099                                 goto next;
1100
1101                         memcpy(&new_key, &key, sizeof(new_key));
1102                         new_key.objectid = inode->i_ino;
1103                         new_key.offset = key.offset + destoff - off;
1104
1105                         if (type == BTRFS_FILE_EXTENT_REG ||
1106                             type == BTRFS_FILE_EXTENT_PREALLOC) {
1107                                 ret = btrfs_insert_empty_item(trans, root, path,
1108                                                               &new_key, size);
1109                                 if (ret)
1110                                         goto out;
1111
1112                                 leaf = path->nodes[0];
1113                                 slot = path->slots[0];
1114                                 write_extent_buffer(leaf, buf,
1115                                             btrfs_item_ptr_offset(leaf, slot),
1116                                             size);
1117
1118                                 extent = btrfs_item_ptr(leaf, slot,
1119                                                 struct btrfs_file_extent_item);
1120
1121                                 if (off > key.offset) {
1122                                         datao += off - key.offset;
1123                                         datal -= off - key.offset;
1124                                 }
1125                                 if (key.offset + datao + datal > off + len)
1126                                         datal = off + len - key.offset - datao;
1127                                 /* disko == 0 means it's a hole */
1128                                 if (!disko)
1129                                         datao = 0;
1130
1131                                 btrfs_set_file_extent_offset(leaf, extent,
1132                                                              datao);
1133                                 btrfs_set_file_extent_num_bytes(leaf, extent,
1134                                                                 datal);
1135                                 if (disko) {
1136                                         inode_add_bytes(inode, datal);
1137                                         ret = btrfs_inc_extent_ref(trans, root,
1138                                                         disko, diskl, 0,
1139                                                         root->root_key.objectid,
1140                                                         inode->i_ino,
1141                                                         new_key.offset - datao);
1142                                         BUG_ON(ret);
1143                                 }
1144                         } else if (type == BTRFS_FILE_EXTENT_INLINE) {
1145                                 u64 skip = 0;
1146                                 u64 trim = 0;
1147                                 if (off > key.offset) {
1148                                         skip = off - key.offset;
1149                                         new_key.offset += skip;
1150                                 }
1151
1152                                 if (key.offset + datal > off+len)
1153                                         trim = key.offset + datal - (off+len);
1154
1155                                 if (comp && (skip || trim)) {
1156                                         ret = -EINVAL;
1157                                         goto out;
1158                                 }
1159                                 size -= skip + trim;
1160                                 datal -= skip + trim;
1161                                 ret = btrfs_insert_empty_item(trans, root, path,
1162                                                               &new_key, size);
1163                                 if (ret)
1164                                         goto out;
1165
1166                                 if (skip) {
1167                                         u32 start =
1168                                           btrfs_file_extent_calc_inline_size(0);
1169                                         memmove(buf+start, buf+start+skip,
1170                                                 datal);
1171                                 }
1172
1173                                 leaf = path->nodes[0];
1174                                 slot = path->slots[0];
1175                                 write_extent_buffer(leaf, buf,
1176                                             btrfs_item_ptr_offset(leaf, slot),
1177                                             size);
1178                                 inode_add_bytes(inode, datal);
1179                         }
1180
1181                         btrfs_mark_buffer_dirty(leaf);
1182                 }
1183
1184 next:
1185                 btrfs_release_path(root, path);
1186                 key.offset++;
1187         }
1188         ret = 0;
1189 out:
1190         btrfs_release_path(root, path);
1191         if (ret == 0) {
1192                 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1193                 if (destoff + olen > inode->i_size)
1194                         btrfs_i_size_write(inode, destoff + olen);
1195                 BTRFS_I(inode)->flags = BTRFS_I(src)->flags;
1196                 ret = btrfs_update_inode(trans, root, inode);
1197         }
1198         btrfs_end_transaction(trans, root);
1199         unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
1200         if (ret)
1201                 vmtruncate(inode, 0);
1202 out_unlock:
1203         mutex_unlock(&src->i_mutex);
1204         mutex_unlock(&inode->i_mutex);
1205         vfree(buf);
1206         btrfs_free_path(path);
1207 out_fput:
1208         fput(src_file);
1209 out_drop_write:
1210         mnt_drop_write(file->f_path.mnt);
1211         return ret;
1212 }
1213
1214 static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
1215 {
1216         struct btrfs_ioctl_clone_range_args args;
1217
1218         if (copy_from_user(&args, argp, sizeof(args)))
1219                 return -EFAULT;
1220         return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
1221                                  args.src_length, args.dest_offset);
1222 }
1223
1224 /*
1225  * there are many ways the trans_start and trans_end ioctls can lead
1226  * to deadlocks.  They should only be used by applications that
1227  * basically own the machine, and have a very in depth understanding
1228  * of all the possible deadlocks and enospc problems.
1229  */
1230 static long btrfs_ioctl_trans_start(struct file *file)
1231 {
1232         struct inode *inode = fdentry(file)->d_inode;
1233         struct btrfs_root *root = BTRFS_I(inode)->root;
1234         struct btrfs_trans_handle *trans;
1235         int ret;
1236
1237         ret = -EPERM;
1238         if (!capable(CAP_SYS_ADMIN))
1239                 goto out;
1240
1241         ret = -EINPROGRESS;
1242         if (file->private_data)
1243                 goto out;
1244
1245         ret = mnt_want_write(file->f_path.mnt);
1246         if (ret)
1247                 goto out;
1248
1249         mutex_lock(&root->fs_info->trans_mutex);
1250         root->fs_info->open_ioctl_trans++;
1251         mutex_unlock(&root->fs_info->trans_mutex);
1252
1253         ret = -ENOMEM;
1254         trans = btrfs_start_ioctl_transaction(root, 0);
1255         if (!trans)
1256                 goto out_drop;
1257
1258         file->private_data = trans;
1259         return 0;
1260
1261 out_drop:
1262         mutex_lock(&root->fs_info->trans_mutex);
1263         root->fs_info->open_ioctl_trans--;
1264         mutex_unlock(&root->fs_info->trans_mutex);
1265         mnt_drop_write(file->f_path.mnt);
1266 out:
1267         return ret;
1268 }
1269
1270 /*
1271  * there are many ways the trans_start and trans_end ioctls can lead
1272  * to deadlocks.  They should only be used by applications that
1273  * basically own the machine, and have a very in depth understanding
1274  * of all the possible deadlocks and enospc problems.
1275  */
1276 long btrfs_ioctl_trans_end(struct file *file)
1277 {
1278         struct inode *inode = fdentry(file)->d_inode;
1279         struct btrfs_root *root = BTRFS_I(inode)->root;
1280         struct btrfs_trans_handle *trans;
1281
1282         trans = file->private_data;
1283         if (!trans)
1284                 return -EINVAL;
1285         file->private_data = NULL;
1286
1287         btrfs_end_transaction(trans, root);
1288
1289         mutex_lock(&root->fs_info->trans_mutex);
1290         root->fs_info->open_ioctl_trans--;
1291         mutex_unlock(&root->fs_info->trans_mutex);
1292
1293         mnt_drop_write(file->f_path.mnt);
1294         return 0;
1295 }
1296
1297 long btrfs_ioctl(struct file *file, unsigned int
1298                 cmd, unsigned long arg)
1299 {
1300         struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
1301         void __user *argp = (void __user *)arg;
1302
1303         switch (cmd) {
1304         case FS_IOC_GETFLAGS:
1305                 return btrfs_ioctl_getflags(file, argp);
1306         case FS_IOC_SETFLAGS:
1307                 return btrfs_ioctl_setflags(file, argp);
1308         case FS_IOC_GETVERSION:
1309                 return btrfs_ioctl_getversion(file, argp);
1310         case BTRFS_IOC_SNAP_CREATE:
1311                 return btrfs_ioctl_snap_create(file, argp, 0);
1312         case BTRFS_IOC_SUBVOL_CREATE:
1313                 return btrfs_ioctl_snap_create(file, argp, 1);
1314         case BTRFS_IOC_SNAP_DESTROY:
1315                 return btrfs_ioctl_snap_destroy(file, argp);
1316         case BTRFS_IOC_DEFRAG:
1317                 return btrfs_ioctl_defrag(file);
1318         case BTRFS_IOC_RESIZE:
1319                 return btrfs_ioctl_resize(root, argp);
1320         case BTRFS_IOC_ADD_DEV:
1321                 return btrfs_ioctl_add_dev(root, argp);
1322         case BTRFS_IOC_RM_DEV:
1323                 return btrfs_ioctl_rm_dev(root, argp);
1324         case BTRFS_IOC_BALANCE:
1325                 return btrfs_balance(root->fs_info->dev_root);
1326         case BTRFS_IOC_CLONE:
1327                 return btrfs_ioctl_clone(file, arg, 0, 0, 0);
1328         case BTRFS_IOC_CLONE_RANGE:
1329                 return btrfs_ioctl_clone_range(file, argp);
1330         case BTRFS_IOC_TRANS_START:
1331                 return btrfs_ioctl_trans_start(file);
1332         case BTRFS_IOC_TRANS_END:
1333                 return btrfs_ioctl_trans_end(file);
1334         case BTRFS_IOC_SYNC:
1335                 btrfs_sync_fs(file->f_dentry->d_sb, 1);
1336                 return 0;
1337         }
1338
1339         return -ENOTTY;
1340 }