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   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                 shrink_dcache_sb(root->fs_info->sb);
 834                 btrfs_invalidate_inodes(dest);
 835                 d_delete(dentry);
 836         }
 837 out_dput:
 838         dput(dentry);
 839 out_unlock_dir:
 840         mutex_unlock(&dir->i_mutex);
 841         mnt_drop_write(file->f_path.mnt);
 842 out:
 843         kfree(vol_args);
 844         return err;
 845 }
 846
 847 static int btrfs_ioctl_defrag(struct file *file)
 848 {
 849         struct inode *inode = fdentry(file)->d_inode;
 850         struct btrfs_root *root = BTRFS_I(inode)->root;
 851         int ret;
 852
 853         ret = mnt_want_write(file->f_path.mnt);
 854         if (ret)
 855                 return ret;
 856
 857         switch (inode->i_mode & S_IFMT) {
 858         case S_IFDIR:
 859                 if (!capable(CAP_SYS_ADMIN)) {
 860                         ret = -EPERM;
 861                         goto out;
 862                 }
 863                 btrfs_defrag_root(root, 0);
 864                 btrfs_defrag_root(root->fs_info->extent_root, 0);
 865                 break;
 866         case S_IFREG:
 867                 if (!(file->f_mode & FMODE_WRITE)) {
 868                         ret = -EINVAL;
 869                         goto out;
 870                 }
 871                 btrfs_defrag_file(file);
 872                 break;
 873         }
 874 out:
 875         mnt_drop_write(file->f_path.mnt);
 876         return ret;
 877 }
 878
 879 static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
 880 {
 881         struct btrfs_ioctl_vol_args *vol_args;
 882         int ret;
 883
 884         if (!capable(CAP_SYS_ADMIN))
 885                 return -EPERM;
 886
 887         vol_args = memdup_user(arg, sizeof(*vol_args));
 888         if (IS_ERR(vol_args))
 889                 return PTR_ERR(vol_args);
 890
 891         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
 892         ret = btrfs_init_new_device(root, vol_args->name);
 893
 894         kfree(vol_args);
 895         return ret;
 896 }
 897
 898 static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
 899 {
 900         struct btrfs_ioctl_vol_args *vol_args;
 901         int ret;
 902
 903         if (!capable(CAP_SYS_ADMIN))
 904                 return -EPERM;
 905
 906         if (root->fs_info->sb->s_flags & MS_RDONLY)
 907                 return -EROFS;
 908
 909         vol_args = memdup_user(arg, sizeof(*vol_args));
 910         if (IS_ERR(vol_args))
 911                 return PTR_ERR(vol_args);
 912
 913         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
 914         ret = btrfs_rm_device(root, vol_args->name);
 915
 916         kfree(vol_args);
 917         return ret;
 918 }
 919
 920 static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
 921                                        u64 off, u64 olen, u64 destoff)
 922 {
 923         struct inode *inode = fdentry(file)->d_inode;
 924         struct btrfs_root *root = BTRFS_I(inode)->root;
 925         struct file *src_file;
 926         struct inode *src;
 927         struct btrfs_trans_handle *trans;
 928         struct btrfs_path *path;
 929         struct extent_buffer *leaf;
 930         char *buf;
 931         struct btrfs_key key;
 932         u32 nritems;
 933         int slot;
 934         int ret;
 935         u64 len = olen;
 936         u64 bs = root->fs_info->sb->s_blocksize;
 937         u64 hint_byte;
 938
 939         /*
 940          * TODO:
 941          * - split compressed inline extents.  annoying: we need to
 942          *   decompress into destination's address_space (the file offset
 943          *   may change, so source mapping won't do), then recompress (or
 944          *   otherwise reinsert) a subrange.
 945          * - allow ranges within the same file to be cloned (provided
 946          *   they don't overlap)?
 947          */
 948
 949         /* the destination must be opened for writing */
 950         if (!(file->f_mode & FMODE_WRITE))
 951                 return -EINVAL;
 952
 953         ret = mnt_want_write(file->f_path.mnt);
 954         if (ret)
 955                 return ret;
 956
 957         src_file = fget(srcfd);
 958         if (!src_file) {
 959                 ret = -EBADF;
 960                 goto out_drop_write;
 961         }
 962         src = src_file->f_dentry->d_inode;
 963
 964         ret = -EINVAL;
 965         if (src == inode)
 966                 goto out_fput;
 967
 968         ret = -EISDIR;
 969         if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
 970                 goto out_fput;
 971
 972         ret = -EXDEV;
 973         if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root)
 974                 goto out_fput;
 975
 976         ret = -ENOMEM;
 977         buf = vmalloc(btrfs_level_size(root, 0));
 978         if (!buf)
 979                 goto out_fput;
 980
 981         path = btrfs_alloc_path();
 982         if (!path) {
 983                 vfree(buf);
 984                 goto out_fput;
 985         }
 986         path->reada = 2;
 987
 988         if (inode < src) {
 989                 mutex_lock(&inode->i_mutex);
 990                 mutex_lock(&src->i_mutex);
 991         } else {
 992                 mutex_lock(&src->i_mutex);
 993                 mutex_lock(&inode->i_mutex);
 994         }
 995
 996         /* determine range to clone */
 997         ret = -EINVAL;
 998         if (off >= src->i_size || off + len > src->i_size)
 999                 goto out_unlock;
1000         if (len == 0)
1001                 olen = len = src->i_size - off;
1002         /* if we extend to eof, continue to block boundary */
1003         if (off + len == src->i_size)
1004                 len = ((src->i_size + bs-1) & ~(bs-1))
1005                         - off;
1006
1007         /* verify the end result is block aligned */
1008         if ((off & (bs-1)) ||
1009             ((off + len) & (bs-1)))
1010                 goto out_unlock;
1011
1012         /* do any pending delalloc/csum calc on src, one way or
1013            another, and lock file content */
1014         while (1) {
1015                 struct btrfs_ordered_extent *ordered;
1016                 lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
1017                 ordered = btrfs_lookup_first_ordered_extent(inode, off+len);
1018                 if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered)
1019                         break;
1020                 unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
1021                 if (ordered)
1022                         btrfs_put_ordered_extent(ordered);
1023                 btrfs_wait_ordered_range(src, off, off+len);
1024         }
1025
1026         trans = btrfs_start_transaction(root, 1);
1027         BUG_ON(!trans);
1028
1029         /* punch hole in destination first */
1030         btrfs_drop_extents(trans, root, inode, off, off + len,
1031                            off + len, 0, &hint_byte, 1);
1032
1033         /* clone data */
1034         key.objectid = src->i_ino;
1035         key.type = BTRFS_EXTENT_DATA_KEY;
1036         key.offset = 0;
1037
1038         while (1) {
1039                 /*
1040                  * note the key will change type as we walk through the
1041                  * tree.
1042                  */
1043                 ret = btrfs_search_slot(trans, root, &key, path, 0, 0);
1044                 if (ret < 0)
1045                         goto out;
1046
1047                 nritems = btrfs_header_nritems(path->nodes[0]);
1048                 if (path->slots[0] >= nritems) {
1049                         ret = btrfs_next_leaf(root, path);
1050                         if (ret < 0)
1051                                 goto out;
1052                         if (ret > 0)
1053                                 break;
1054                         nritems = btrfs_header_nritems(path->nodes[0]);
1055                 }
1056                 leaf = path->nodes[0];
1057                 slot = path->slots[0];
1058
1059                 btrfs_item_key_to_cpu(leaf, &key, slot);
1060                 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
1061                     key.objectid != src->i_ino)
1062                         break;
1063
1064                 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
1065                         struct btrfs_file_extent_item *extent;
1066                         int type;
1067                         u32 size;
1068                         struct btrfs_key new_key;
1069                         u64 disko = 0, diskl = 0;
1070                         u64 datao = 0, datal = 0;
1071                         u8 comp;
1072
1073                         size = btrfs_item_size_nr(leaf, slot);
1074                         read_extent_buffer(leaf, buf,
1075                                            btrfs_item_ptr_offset(leaf, slot),
1076                                            size);
1077
1078                         extent = btrfs_item_ptr(leaf, slot,
1079                                                 struct btrfs_file_extent_item);
1080                         comp = btrfs_file_extent_compression(leaf, extent);
1081                         type = btrfs_file_extent_type(leaf, extent);
1082                         if (type == BTRFS_FILE_EXTENT_REG ||
1083                             type == BTRFS_FILE_EXTENT_PREALLOC) {
1084                                 disko = btrfs_file_extent_disk_bytenr(leaf,
1085                                                                       extent);
1086                                 diskl = btrfs_file_extent_disk_num_bytes(leaf,
1087                                                                  extent);
1088                                 datao = btrfs_file_extent_offset(leaf, extent);
1089                                 datal = btrfs_file_extent_num_bytes(leaf,
1090                                                                     extent);
1091                         } else if (type == BTRFS_FILE_EXTENT_INLINE) {
1092                                 /* take upper bound, may be compressed */
1093                                 datal = btrfs_file_extent_ram_bytes(leaf,
1094                                                                     extent);
1095                         }
1096                         btrfs_release_path(root, path);
1097
1098                         if (key.offset + datal < off ||
1099                             key.offset >= off+len)
1100                                 goto next;
1101
1102                         memcpy(&new_key, &key, sizeof(new_key));
1103                         new_key.objectid = inode->i_ino;
1104                         new_key.offset = key.offset + destoff - off;
1105
1106                         if (type == BTRFS_FILE_EXTENT_REG ||
1107                             type == BTRFS_FILE_EXTENT_PREALLOC) {
1108                                 ret = btrfs_insert_empty_item(trans, root, path,
1109                                                               &new_key, size);
1110                                 if (ret)
1111                                         goto out;
1112
1113                                 leaf = path->nodes[0];
1114                                 slot = path->slots[0];
1115                                 write_extent_buffer(leaf, buf,
1116                                             btrfs_item_ptr_offset(leaf, slot),
1117                                             size);
1118
1119                                 extent = btrfs_item_ptr(leaf, slot,
1120                                                 struct btrfs_file_extent_item);
1121
1122                                 if (off > key.offset) {
1123                                         datao += off - key.offset;
1124                                         datal -= off - key.offset;
1125                                 }
1126
1127                                 if (key.offset + datal > off + len)
1128                                         datal = off + len - key.offset;
1129
1130                                 /* disko == 0 means it's a hole */
1131                                 if (!disko)
1132                                         datao = 0;
1133
1134                                 btrfs_set_file_extent_offset(leaf, extent,
1135                                                              datao);
1136                                 btrfs_set_file_extent_num_bytes(leaf, extent,
1137                                                                 datal);
1138                                 if (disko) {
1139                                         inode_add_bytes(inode, datal);
1140                                         ret = btrfs_inc_extent_ref(trans, root,
1141                                                         disko, diskl, 0,
1142                                                         root->root_key.objectid,
1143                                                         inode->i_ino,
1144                                                         new_key.offset - datao);
1145                                         BUG_ON(ret);
1146                                 }
1147                         } else if (type == BTRFS_FILE_EXTENT_INLINE) {
1148                                 u64 skip = 0;
1149                                 u64 trim = 0;
1150                                 if (off > key.offset) {
1151                                         skip = off - key.offset;
1152                                         new_key.offset += skip;
1153                                 }
1154
1155                                 if (key.offset + datal > off+len)
1156                                         trim = key.offset + datal - (off+len);
1157
1158                                 if (comp && (skip || trim)) {
1159                                         ret = -EINVAL;
1160                                         goto out;
1161                                 }
1162                                 size -= skip + trim;
1163                                 datal -= skip + trim;
1164                                 ret = btrfs_insert_empty_item(trans, root, path,
1165                                                               &new_key, size);
1166                                 if (ret)
1167                                         goto out;
1168
1169                                 if (skip) {
1170                                         u32 start =
1171                                           btrfs_file_extent_calc_inline_size(0);
1172                                         memmove(buf+start, buf+start+skip,
1173                                                 datal);
1174                                 }
1175
1176                                 leaf = path->nodes[0];
1177                                 slot = path->slots[0];
1178                                 write_extent_buffer(leaf, buf,
1179                                             btrfs_item_ptr_offset(leaf, slot),
1180                                             size);
1181                                 inode_add_bytes(inode, datal);
1182                         }
1183
1184                         btrfs_mark_buffer_dirty(leaf);
1185                 }
1186
1187 next:
1188                 btrfs_release_path(root, path);
1189                 key.offset++;
1190         }
1191         ret = 0;
1192 out:
1193         btrfs_release_path(root, path);
1194         if (ret == 0) {
1195                 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1196                 if (destoff + olen > inode->i_size)
1197                         btrfs_i_size_write(inode, destoff + olen);
1198                 BTRFS_I(inode)->flags = BTRFS_I(src)->flags;
1199                 ret = btrfs_update_inode(trans, root, inode);
1200         }
1201         btrfs_end_transaction(trans, root);
1202         unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
1203         if (ret)
1204                 vmtruncate(inode, 0);
1205 out_unlock:
1206         mutex_unlock(&src->i_mutex);
1207         mutex_unlock(&inode->i_mutex);
1208         vfree(buf);
1209         btrfs_free_path(path);
1210 out_fput:
1211         fput(src_file);
1212 out_drop_write:
1213         mnt_drop_write(file->f_path.mnt);
1214         return ret;
1215 }
1216
1217 static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
1218 {
1219         struct btrfs_ioctl_clone_range_args args;
1220
1221         if (copy_from_user(&args, argp, sizeof(args)))
1222                 return -EFAULT;
1223         return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
1224                                  args.src_length, args.dest_offset);
1225 }
1226
1227 /*
1228  * there are many ways the trans_start and trans_end ioctls can lead
1229  * to deadlocks.  They should only be used by applications that
1230  * basically own the machine, and have a very in depth understanding
1231  * of all the possible deadlocks and enospc problems.
1232  */
1233 static long btrfs_ioctl_trans_start(struct file *file)
1234 {
1235         struct inode *inode = fdentry(file)->d_inode;
1236         struct btrfs_root *root = BTRFS_I(inode)->root;
1237         struct btrfs_trans_handle *trans;
1238         int ret;
1239
1240         ret = -EPERM;
1241         if (!capable(CAP_SYS_ADMIN))
1242                 goto out;
1243
1244         ret = -EINPROGRESS;
1245         if (file->private_data)
1246                 goto out;
1247
1248         ret = mnt_want_write(file->f_path.mnt);
1249         if (ret)
1250                 goto out;
1251
1252         mutex_lock(&root->fs_info->trans_mutex);
1253         root->fs_info->open_ioctl_trans++;
1254         mutex_unlock(&root->fs_info->trans_mutex);
1255
1256         ret = -ENOMEM;
1257         trans = btrfs_start_ioctl_transaction(root, 0);
1258         if (!trans)
1259                 goto out_drop;
1260
1261         file->private_data = trans;
1262         return 0;
1263
1264 out_drop:
1265         mutex_lock(&root->fs_info->trans_mutex);
1266         root->fs_info->open_ioctl_trans--;
1267         mutex_unlock(&root->fs_info->trans_mutex);
1268         mnt_drop_write(file->f_path.mnt);
1269 out:
1270         return ret;
1271 }
1272
1273 /*
1274  * there are many ways the trans_start and trans_end ioctls can lead
1275  * to deadlocks.  They should only be used by applications that
1276  * basically own the machine, and have a very in depth understanding
1277  * of all the possible deadlocks and enospc problems.
1278  */
1279 long btrfs_ioctl_trans_end(struct file *file)
1280 {
1281         struct inode *inode = fdentry(file)->d_inode;
1282         struct btrfs_root *root = BTRFS_I(inode)->root;
1283         struct btrfs_trans_handle *trans;
1284
1285         trans = file->private_data;
1286         if (!trans)
1287                 return -EINVAL;
1288         file->private_data = NULL;
1289
1290         btrfs_end_transaction(trans, root);
1291
1292         mutex_lock(&root->fs_info->trans_mutex);
1293         root->fs_info->open_ioctl_trans--;
1294         mutex_unlock(&root->fs_info->trans_mutex);
1295
1296         mnt_drop_write(file->f_path.mnt);
1297         return 0;
1298 }
1299
1300 long btrfs_ioctl(struct file *file, unsigned int
1301                 cmd, unsigned long arg)
1302 {
1303         struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
1304         void __user *argp = (void __user *)arg;
1305
1306         switch (cmd) {
1307         case FS_IOC_GETFLAGS:
1308                 return btrfs_ioctl_getflags(file, argp);
1309         case FS_IOC_SETFLAGS:
1310                 return btrfs_ioctl_setflags(file, argp);
1311         case FS_IOC_GETVERSION:
1312                 return btrfs_ioctl_getversion(file, argp);
1313         case BTRFS_IOC_SNAP_CREATE:
1314                 return btrfs_ioctl_snap_create(file, argp, 0);
1315         case BTRFS_IOC_SUBVOL_CREATE:
1316                 return btrfs_ioctl_snap_create(file, argp, 1);
1317         case BTRFS_IOC_SNAP_DESTROY:
1318                 return btrfs_ioctl_snap_destroy(file, argp);
1319         case BTRFS_IOC_DEFRAG:
1320                 return btrfs_ioctl_defrag(file);
1321         case BTRFS_IOC_RESIZE:
1322                 return btrfs_ioctl_resize(root, argp);
1323         case BTRFS_IOC_ADD_DEV:
1324                 return btrfs_ioctl_add_dev(root, argp);
1325         case BTRFS_IOC_RM_DEV:
1326                 return btrfs_ioctl_rm_dev(root, argp);
1327         case BTRFS_IOC_BALANCE:
1328                 return btrfs_balance(root->fs_info->dev_root);
1329         case BTRFS_IOC_CLONE:
1330                 return btrfs_ioctl_clone(file, arg, 0, 0, 0);
1331         case BTRFS_IOC_CLONE_RANGE:
1332                 return btrfs_ioctl_clone_range(file, argp);
1333         case BTRFS_IOC_TRANS_START:
1334                 return btrfs_ioctl_trans_start(file);
1335         case BTRFS_IOC_TRANS_END:
1336                 return btrfs_ioctl_trans_end(file);
1337         case BTRFS_IOC_SYNC:
1338                 btrfs_sync_fs(file->f_dentry->d_sb, 1);
1339                 return 0;
1340         }
1341
1342         return -ENOTTY;
1343 }