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