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 <linux/slab.h>
  43 #include "compat.h"
  44 #include "ctree.h"
  45 #include "disk-io.h"
  46 #include "transaction.h"
  47 #include "btrfs_inode.h"
  48 #include "ioctl.h"
  49 #include "print-tree.h"
  50 #include "volumes.h"
  51 #include "locking.h"
  52
  53 /* Mask out flags that are inappropriate for the given type of inode. */
  54 static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
  55 {
  56         if (S_ISDIR(mode))
  57                 return flags;
  58         else if (S_ISREG(mode))
  59                 return flags & ~FS_DIRSYNC_FL;
  60         else
  61                 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
  62 }
  63
  64 /*
  65  * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
  66  */
  67 static unsigned int btrfs_flags_to_ioctl(unsigned int flags)
  68 {
  69         unsigned int iflags = 0;
  70
  71         if (flags & BTRFS_INODE_SYNC)
  72                 iflags |= FS_SYNC_FL;
  73         if (flags & BTRFS_INODE_IMMUTABLE)
  74                 iflags |= FS_IMMUTABLE_FL;
  75         if (flags & BTRFS_INODE_APPEND)
  76                 iflags |= FS_APPEND_FL;
  77         if (flags & BTRFS_INODE_NODUMP)
  78                 iflags |= FS_NODUMP_FL;
  79         if (flags & BTRFS_INODE_NOATIME)
  80                 iflags |= FS_NOATIME_FL;
  81         if (flags & BTRFS_INODE_DIRSYNC)
  82                 iflags |= FS_DIRSYNC_FL;
  83
  84         return iflags;
  85 }
  86
  87 /*
  88  * Update inode->i_flags based on the btrfs internal flags.
  89  */
  90 void btrfs_update_iflags(struct inode *inode)
  91 {
  92         struct btrfs_inode *ip = BTRFS_I(inode);
  93
  94         inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
  95
  96         if (ip->flags & BTRFS_INODE_SYNC)
  97                 inode->i_flags |= S_SYNC;
  98         if (ip->flags & BTRFS_INODE_IMMUTABLE)
  99                 inode->i_flags |= S_IMMUTABLE;
 100         if (ip->flags & BTRFS_INODE_APPEND)
 101                 inode->i_flags |= S_APPEND;
 102         if (ip->flags & BTRFS_INODE_NOATIME)
 103                 inode->i_flags |= S_NOATIME;
 104         if (ip->flags & BTRFS_INODE_DIRSYNC)
 105                 inode->i_flags |= S_DIRSYNC;
 106 }
 107
 108 /*
 109  * Inherit flags from the parent inode.
 110  *
 111  * Unlike extN we don't have any flags we don't want to inherit currently.
 112  */
 113 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
 114 {
 115         unsigned int flags;
 116
 117         if (!dir)
 118                 return;
 119
 120         flags = BTRFS_I(dir)->flags;
 121
 122         if (S_ISREG(inode->i_mode))
 123                 flags &= ~BTRFS_INODE_DIRSYNC;
 124         else if (!S_ISDIR(inode->i_mode))
 125                 flags &= (BTRFS_INODE_NODUMP | BTRFS_INODE_NOATIME);
 126
 127         BTRFS_I(inode)->flags = flags;
 128         btrfs_update_iflags(inode);
 129 }
 130
 131 static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
 132 {
 133         struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode);
 134         unsigned int flags = btrfs_flags_to_ioctl(ip->flags);
 135
 136         if (copy_to_user(arg, &flags, sizeof(flags)))
 137                 return -EFAULT;
 138         return 0;
 139 }
 140
 141 static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
 142 {
 143         struct inode *inode = file->f_path.dentry->d_inode;
 144         struct btrfs_inode *ip = BTRFS_I(inode);
 145         struct btrfs_root *root = ip->root;
 146         struct btrfs_trans_handle *trans;
 147         unsigned int flags, oldflags;
 148         int ret;
 149
 150         if (copy_from_user(&flags, arg, sizeof(flags)))
 151                 return -EFAULT;
 152
 153         if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
 154                       FS_NOATIME_FL | FS_NODUMP_FL | \
 155                       FS_SYNC_FL | FS_DIRSYNC_FL))
 156                 return -EOPNOTSUPP;
 157
 158         if (!is_owner_or_cap(inode))
 159                 return -EACCES;
 160
 161         mutex_lock(&inode->i_mutex);
 162
 163         flags = btrfs_mask_flags(inode->i_mode, flags);
 164         oldflags = btrfs_flags_to_ioctl(ip->flags);
 165         if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
 166                 if (!capable(CAP_LINUX_IMMUTABLE)) {
 167                         ret = -EPERM;
 168                         goto out_unlock;
 169                 }
 170         }
 171
 172         ret = mnt_want_write(file->f_path.mnt);
 173         if (ret)
 174                 goto out_unlock;
 175
 176         if (flags & FS_SYNC_FL)
 177                 ip->flags |= BTRFS_INODE_SYNC;
 178         else
 179                 ip->flags &= ~BTRFS_INODE_SYNC;
 180         if (flags & FS_IMMUTABLE_FL)
 181                 ip->flags |= BTRFS_INODE_IMMUTABLE;
 182         else
 183                 ip->flags &= ~BTRFS_INODE_IMMUTABLE;
 184         if (flags & FS_APPEND_FL)
 185                 ip->flags |= BTRFS_INODE_APPEND;
 186         else
 187                 ip->flags &= ~BTRFS_INODE_APPEND;
 188         if (flags & FS_NODUMP_FL)
 189                 ip->flags |= BTRFS_INODE_NODUMP;
 190         else
 191                 ip->flags &= ~BTRFS_INODE_NODUMP;
 192         if (flags & FS_NOATIME_FL)
 193                 ip->flags |= BTRFS_INODE_NOATIME;
 194         else
 195                 ip->flags &= ~BTRFS_INODE_NOATIME;
 196         if (flags & FS_DIRSYNC_FL)
 197                 ip->flags |= BTRFS_INODE_DIRSYNC;
 198         else
 199                 ip->flags &= ~BTRFS_INODE_DIRSYNC;
 200
 201
 202         trans = btrfs_join_transaction(root, 1);
 203         BUG_ON(!trans);
 204
 205         ret = btrfs_update_inode(trans, root, inode);
 206         BUG_ON(ret);
 207
 208         btrfs_update_iflags(inode);
 209         inode->i_ctime = CURRENT_TIME;
 210         btrfs_end_transaction(trans, root);
 211
 212         mnt_drop_write(file->f_path.mnt);
 213  out_unlock:
 214         mutex_unlock(&inode->i_mutex);
 215         return 0;
 216 }
 217
 218 static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
 219 {
 220         struct inode *inode = file->f_path.dentry->d_inode;
 221
 222         return put_user(inode->i_generation, arg);
 223 }
 224
 225 static noinline int create_subvol(struct btrfs_root *root,
 226                                   struct dentry *dentry,
 227                                   char *name, int namelen)
 228 {
 229         struct btrfs_trans_handle *trans;
 230         struct btrfs_key key;
 231         struct btrfs_root_item root_item;
 232         struct btrfs_inode_item *inode_item;
 233         struct extent_buffer *leaf;
 234         struct btrfs_root *new_root;
 235         struct inode *dir = dentry->d_parent->d_inode;
 236         int ret;
 237         int err;
 238         u64 objectid;
 239         u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
 240         u64 index = 0;
 241
 242         ret = btrfs_find_free_objectid(NULL, root->fs_info->tree_root,
 243                                        0, &objectid);
 244         if (ret)
 245                 return ret;
 246         /*
 247          * 1 - inode item
 248          * 2 - refs
 249          * 1 - root item
 250          * 2 - dir items
 251          */
 252         trans = btrfs_start_transaction(root, 6);
 253         if (IS_ERR(trans))
 254                 return PTR_ERR(trans);
 255
 256         leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
 257                                       0, objectid, NULL, 0, 0, 0);
 258         if (IS_ERR(leaf)) {
 259                 ret = PTR_ERR(leaf);
 260                 goto fail;
 261         }
 262
 263         memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
 264         btrfs_set_header_bytenr(leaf, leaf->start);
 265         btrfs_set_header_generation(leaf, trans->transid);
 266         btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
 267         btrfs_set_header_owner(leaf, objectid);
 268
 269         write_extent_buffer(leaf, root->fs_info->fsid,
 270                             (unsigned long)btrfs_header_fsid(leaf),
 271                             BTRFS_FSID_SIZE);
 272         write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
 273                             (unsigned long)btrfs_header_chunk_tree_uuid(leaf),
 274                             BTRFS_UUID_SIZE);
 275         btrfs_mark_buffer_dirty(leaf);
 276
 277         inode_item = &root_item.inode;
 278         memset(inode_item, 0, sizeof(*inode_item));
 279         inode_item->generation = cpu_to_le64(1);
 280         inode_item->size = cpu_to_le64(3);
 281         inode_item->nlink = cpu_to_le32(1);
 282         inode_item->nbytes = cpu_to_le64(root->leafsize);
 283         inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
 284
 285         btrfs_set_root_bytenr(&root_item, leaf->start);
 286         btrfs_set_root_generation(&root_item, trans->transid);
 287         btrfs_set_root_level(&root_item, 0);
 288         btrfs_set_root_refs(&root_item, 1);
 289         btrfs_set_root_used(&root_item, leaf->len);
 290         btrfs_set_root_last_snapshot(&root_item, 0);
 291
 292         memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
 293         root_item.drop_level = 0;
 294
 295         btrfs_tree_unlock(leaf);
 296         free_extent_buffer(leaf);
 297         leaf = NULL;
 298
 299         btrfs_set_root_dirid(&root_item, new_dirid);
 300
 301         key.objectid = objectid;
 302         key.offset = 0;
 303         btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
 304         ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
 305                                 &root_item);
 306         if (ret)
 307                 goto fail;
 308
 309         key.offset = (u64)-1;
 310         new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
 311         BUG_ON(IS_ERR(new_root));
 312
 313         btrfs_record_root_in_trans(trans, new_root);
 314
 315         ret = btrfs_create_subvol_root(trans, new_root, new_dirid,
 316                                        BTRFS_I(dir)->block_group);
 317         /*
 318          * insert the directory item
 319          */
 320         ret = btrfs_set_inode_index(dir, &index);
 321         BUG_ON(ret);
 322
 323         ret = btrfs_insert_dir_item(trans, root,
 324                                     name, namelen, dir->i_ino, &key,
 325                                     BTRFS_FT_DIR, index);
 326         if (ret)
 327                 goto fail;
 328
 329         btrfs_i_size_write(dir, dir->i_size + namelen * 2);
 330         ret = btrfs_update_inode(trans, root, dir);
 331         BUG_ON(ret);
 332
 333         ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
 334                                  objectid, root->root_key.objectid,
 335                                  dir->i_ino, index, name, namelen);
 336
 337         BUG_ON(ret);
 338
 339         d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
 340 fail:
 341         err = btrfs_commit_transaction(trans, root);
 342         if (err && !ret)
 343                 ret = err;
 344         return ret;
 345 }
 346
 347 static int create_snapshot(struct btrfs_root *root, struct dentry *dentry)
 348 {
 349         struct inode *inode;
 350         struct btrfs_pending_snapshot *pending_snapshot;
 351         struct btrfs_trans_handle *trans;
 352         int ret;
 353
 354         if (!root->ref_cows)
 355                 return -EINVAL;
 356
 357         pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
 358         if (!pending_snapshot)
 359                 return -ENOMEM;
 360
 361         btrfs_init_block_rsv(&pending_snapshot->block_rsv);
 362         pending_snapshot->dentry = dentry;
 363         pending_snapshot->root = root;
 364
 365         trans = btrfs_start_transaction(root->fs_info->extent_root, 5);
 366         if (IS_ERR(trans)) {
 367                 ret = PTR_ERR(trans);
 368                 goto fail;
 369         }
 370
 371         ret = btrfs_snap_reserve_metadata(trans, pending_snapshot);
 372         BUG_ON(ret);
 373
 374         list_add(&pending_snapshot->list,
 375                  &trans->transaction->pending_snapshots);
 376         ret = btrfs_commit_transaction(trans, root->fs_info->extent_root);
 377         BUG_ON(ret);
 378
 379         ret = pending_snapshot->error;
 380         if (ret)
 381                 goto fail;
 382
 383         btrfs_orphan_cleanup(pending_snapshot->snap);
 384
 385         inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
 386         if (IS_ERR(inode)) {
 387                 ret = PTR_ERR(inode);
 388                 goto fail;
 389         }
 390         BUG_ON(!inode);
 391         d_instantiate(dentry, inode);
 392         ret = 0;
 393 fail:
 394         kfree(pending_snapshot);
 395         return ret;
 396 }
 397
 398 /* copy of may_create in fs/namei.c() */
 399 static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
 400 {
 401         if (child->d_inode)
 402                 return -EEXIST;
 403         if (IS_DEADDIR(dir))
 404                 return -ENOENT;
 405         return inode_permission(dir, MAY_WRITE | MAY_EXEC);
 406 }
 407
 408 /*
 409  * Create a new subvolume below @parent.  This is largely modeled after
 410  * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
 411  * inside this filesystem so it's quite a bit simpler.
 412  */
 413 static noinline int btrfs_mksubvol(struct path *parent,
 414                                    char *name, int namelen,
 415                                    struct btrfs_root *snap_src)
 416 {
 417         struct inode *dir  = parent->dentry->d_inode;
 418         struct dentry *dentry;
 419         int error;
 420
 421         mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
 422
 423         dentry = lookup_one_len(name, parent->dentry, namelen);
 424         error = PTR_ERR(dentry);
 425         if (IS_ERR(dentry))
 426                 goto out_unlock;
 427
 428         error = -EEXIST;
 429         if (dentry->d_inode)
 430                 goto out_dput;
 431
 432         error = mnt_want_write(parent->mnt);
 433         if (error)
 434                 goto out_dput;
 435
 436         error = btrfs_may_create(dir, dentry);
 437         if (error)
 438                 goto out_drop_write;
 439
 440         down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
 441
 442         if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
 443                 goto out_up_read;
 444
 445         if (snap_src) {
 446                 error = create_snapshot(snap_src, dentry);
 447         } else {
 448                 error = create_subvol(BTRFS_I(dir)->root, dentry,
 449                                       name, namelen);
 450         }
 451         if (!error)
 452                 fsnotify_mkdir(dir, dentry);
 453 out_up_read:
 454         up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
 455 out_drop_write:
 456         mnt_drop_write(parent->mnt);
 457 out_dput:
 458         dput(dentry);
 459 out_unlock:
 460         mutex_unlock(&dir->i_mutex);
 461         return error;
 462 }
 463
 464 static int should_defrag_range(struct inode *inode, u64 start, u64 len,
 465                                int thresh, u64 *last_len, u64 *skip,
 466                                u64 *defrag_end)
 467 {
 468         struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
 469         struct extent_map *em = NULL;
 470         struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
 471         int ret = 1;
 472
 473
 474         if (thresh == 0)
 475                 thresh = 256 * 1024;
 476
 477         /*
 478          * make sure that once we start defragging and extent, we keep on
 479          * defragging it
 480          */
 481         if (start < *defrag_end)
 482                 return 1;
 483
 484         *skip = 0;
 485
 486         /*
 487          * hopefully we have this extent in the tree already, try without
 488          * the full extent lock
 489          */
 490         read_lock(&em_tree->lock);
 491         em = lookup_extent_mapping(em_tree, start, len);
 492         read_unlock(&em_tree->lock);
 493
 494         if (!em) {
 495                 /* get the big lock and read metadata off disk */
 496                 lock_extent(io_tree, start, start + len - 1, GFP_NOFS);
 497                 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
 498                 unlock_extent(io_tree, start, start + len - 1, GFP_NOFS);
 499
 500                 if (IS_ERR(em))
 501                         return 0;
 502         }
 503
 504         /* this will cover holes, and inline extents */
 505         if (em->block_start >= EXTENT_MAP_LAST_BYTE)
 506                 ret = 0;
 507
 508         /*
 509          * we hit a real extent, if it is big don't bother defragging it again
 510          */
 511         if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh)
 512                 ret = 0;
 513
 514         /*
 515          * last_len ends up being a counter of how many bytes we've defragged.
 516          * every time we choose not to defrag an extent, we reset *last_len
 517          * so that the next tiny extent will force a defrag.
 518          *
 519          * The end result of this is that tiny extents before a single big
 520          * extent will force at least part of that big extent to be defragged.
 521          */
 522         if (ret) {
 523                 *last_len += len;
 524                 *defrag_end = extent_map_end(em);
 525         } else {
 526                 *last_len = 0;
 527                 *skip = extent_map_end(em);
 528                 *defrag_end = 0;
 529         }
 530
 531         free_extent_map(em);
 532         return ret;
 533 }
 534
 535 static int btrfs_defrag_file(struct file *file,
 536                              struct btrfs_ioctl_defrag_range_args *range)
 537 {
 538         struct inode *inode = fdentry(file)->d_inode;
 539         struct btrfs_root *root = BTRFS_I(inode)->root;
 540         struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
 541         struct btrfs_ordered_extent *ordered;
 542         struct page *page;
 543         unsigned long last_index;
 544         unsigned long ra_pages = root->fs_info->bdi.ra_pages;
 545         unsigned long total_read = 0;
 546         u64 page_start;
 547         u64 page_end;
 548         u64 last_len = 0;
 549         u64 skip = 0;
 550         u64 defrag_end = 0;
 551         unsigned long i;
 552         int ret;
 553
 554         if (inode->i_size == 0)
 555                 return 0;
 556
 557         if (range->start + range->len > range->start) {
 558                 last_index = min_t(u64, inode->i_size - 1,
 559                          range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
 560         } else {
 561                 last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT;
 562         }
 563
 564         i = range->start >> PAGE_CACHE_SHIFT;
 565         while (i <= last_index) {
 566                 if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
 567                                         PAGE_CACHE_SIZE,
 568                                         range->extent_thresh,
 569                                         &last_len, &skip,
 570                                         &defrag_end)) {
 571                         unsigned long next;
 572                         /*
 573                          * the should_defrag function tells us how much to skip
 574                          * bump our counter by the suggested amount
 575                          */
 576                         next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
 577                         i = max(i + 1, next);
 578                         continue;
 579                 }
 580
 581                 if (total_read % ra_pages == 0) {
 582                         btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i,
 583                                        min(last_index, i + ra_pages - 1));
 584                 }
 585                 total_read++;
 586                 mutex_lock(&inode->i_mutex);
 587                 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
 588                         BTRFS_I(inode)->force_compress = 1;
 589
 590                 ret  = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE);
 591                 if (ret)
 592                         goto err_unlock;
 593 again:
 594                 if (inode->i_size == 0 ||
 595                     i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) {
 596                         ret = 0;
 597                         goto err_reservations;
 598                 }
 599
 600                 page = grab_cache_page(inode->i_mapping, i);
 601                 if (!page) {
 602                         ret = -ENOMEM;
 603                         goto err_reservations;
 604                 }
 605
 606                 if (!PageUptodate(page)) {
 607                         btrfs_readpage(NULL, page);
 608                         lock_page(page);
 609                         if (!PageUptodate(page)) {
 610                                 unlock_page(page);
 611                                 page_cache_release(page);
 612                                 ret = -EIO;
 613                                 goto err_reservations;
 614                         }
 615                 }
 616
 617                 if (page->mapping != inode->i_mapping) {
 618                         unlock_page(page);
 619                         page_cache_release(page);
 620                         goto again;
 621                 }
 622
 623                 wait_on_page_writeback(page);
 624
 625                 if (PageDirty(page)) {
 626                         btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE);
 627                         goto loop_unlock;
 628                 }
 629
 630                 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
 631                 page_end = page_start + PAGE_CACHE_SIZE - 1;
 632                 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
 633
 634                 ordered = btrfs_lookup_ordered_extent(inode, page_start);
 635                 if (ordered) {
 636                         unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
 637                         unlock_page(page);
 638                         page_cache_release(page);
 639                         btrfs_start_ordered_extent(inode, ordered, 1);
 640                         btrfs_put_ordered_extent(ordered);
 641                         goto again;
 642                 }
 643                 set_page_extent_mapped(page);
 644
 645                 /*
 646                  * this makes sure page_mkwrite is called on the
 647                  * page if it is dirtied again later
 648                  */
 649                 clear_page_dirty_for_io(page);
 650                 clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start,
 651                                   page_end, EXTENT_DIRTY | EXTENT_DELALLOC |
 652                                   EXTENT_DO_ACCOUNTING, GFP_NOFS);
 653
 654                 btrfs_set_extent_delalloc(inode, page_start, page_end, NULL);
 655                 ClearPageChecked(page);
 656                 set_page_dirty(page);
 657                 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
 658
 659 loop_unlock:
 660                 unlock_page(page);
 661                 page_cache_release(page);
 662                 mutex_unlock(&inode->i_mutex);
 663
 664                 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
 665                 i++;
 666         }
 667
 668         if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO))
 669                 filemap_flush(inode->i_mapping);
 670
 671         if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
 672                 /* the filemap_flush will queue IO into the worker threads, but
 673                  * we have to make sure the IO is actually started and that
 674                  * ordered extents get created before we return
 675                  */
 676                 atomic_inc(&root->fs_info->async_submit_draining);
 677                 while (atomic_read(&root->fs_info->nr_async_submits) ||
 678                       atomic_read(&root->fs_info->async_delalloc_pages)) {
 679                         wait_event(root->fs_info->async_submit_wait,
 680                            (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
 681                             atomic_read(&root->fs_info->async_delalloc_pages) == 0));
 682                 }
 683                 atomic_dec(&root->fs_info->async_submit_draining);
 684
 685                 mutex_lock(&inode->i_mutex);
 686                 BTRFS_I(inode)->force_compress = 0;
 687                 mutex_unlock(&inode->i_mutex);
 688         }
 689
 690         return 0;
 691
 692 err_reservations:
 693         btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE);
 694 err_unlock:
 695         mutex_unlock(&inode->i_mutex);
 696         return ret;
 697 }
 698
 699 static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
 700                                         void __user *arg)
 701 {
 702         u64 new_size;
 703         u64 old_size;
 704         u64 devid = 1;
 705         struct btrfs_ioctl_vol_args *vol_args;
 706         struct btrfs_trans_handle *trans;
 707         struct btrfs_device *device = NULL;
 708         char *sizestr;
 709         char *devstr = NULL;
 710         int ret = 0;
 711         int namelen;
 712         int mod = 0;
 713
 714         if (root->fs_info->sb->s_flags & MS_RDONLY)
 715                 return -EROFS;
 716
 717         if (!capable(CAP_SYS_ADMIN))
 718                 return -EPERM;
 719
 720         vol_args = memdup_user(arg, sizeof(*vol_args));
 721         if (IS_ERR(vol_args))
 722                 return PTR_ERR(vol_args);
 723
 724         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
 725         namelen = strlen(vol_args->name);
 726
 727         mutex_lock(&root->fs_info->volume_mutex);
 728         sizestr = vol_args->name;
 729         devstr = strchr(sizestr, ':');
 730         if (devstr) {
 731                 char *end;
 732                 sizestr = devstr + 1;
 733                 *devstr = '\0';
 734                 devstr = vol_args->name;
 735                 devid = simple_strtoull(devstr, &end, 10);
 736                 printk(KERN_INFO "resizing devid %llu\n",
 737                        (unsigned long long)devid);
 738         }
 739         device = btrfs_find_device(root, devid, NULL, NULL);
 740         if (!device) {
 741                 printk(KERN_INFO "resizer unable to find device %llu\n",
 742                        (unsigned long long)devid);
 743                 ret = -EINVAL;
 744                 goto out_unlock;
 745         }
 746         if (!strcmp(sizestr, "max"))
 747                 new_size = device->bdev->bd_inode->i_size;
 748         else {
 749                 if (sizestr[0] == '-') {
 750                         mod = -1;
 751                         sizestr++;
 752                 } else if (sizestr[0] == '+') {
 753                         mod = 1;
 754                         sizestr++;
 755                 }
 756                 new_size = memparse(sizestr, NULL);
 757                 if (new_size == 0) {
 758                         ret = -EINVAL;
 759                         goto out_unlock;
 760                 }
 761         }
 762
 763         old_size = device->total_bytes;
 764
 765         if (mod < 0) {
 766                 if (new_size > old_size) {
 767                         ret = -EINVAL;
 768                         goto out_unlock;
 769                 }
 770                 new_size = old_size - new_size;
 771         } else if (mod > 0) {
 772                 new_size = old_size + new_size;
 773         }
 774
 775         if (new_size < 256 * 1024 * 1024) {
 776                 ret = -EINVAL;
 777                 goto out_unlock;
 778         }
 779         if (new_size > device->bdev->bd_inode->i_size) {
 780                 ret = -EFBIG;
 781                 goto out_unlock;
 782         }
 783
 784         do_div(new_size, root->sectorsize);
 785         new_size *= root->sectorsize;
 786
 787         printk(KERN_INFO "new size for %s is %llu\n",
 788                 device->name, (unsigned long long)new_size);
 789
 790         if (new_size > old_size) {
 791                 trans = btrfs_start_transaction(root, 0);
 792                 ret = btrfs_grow_device(trans, device, new_size);
 793                 btrfs_commit_transaction(trans, root);
 794         } else {
 795                 ret = btrfs_shrink_device(device, new_size);
 796         }
 797
 798 out_unlock:
 799         mutex_unlock(&root->fs_info->volume_mutex);
 800         kfree(vol_args);
 801         return ret;
 802 }
 803
 804 static noinline int btrfs_ioctl_snap_create(struct file *file,
 805                                             void __user *arg, int subvol)
 806 {
 807         struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
 808         struct btrfs_ioctl_vol_args *vol_args;
 809         struct file *src_file;
 810         int namelen;
 811         int ret = 0;
 812
 813         if (root->fs_info->sb->s_flags & MS_RDONLY)
 814                 return -EROFS;
 815
 816         vol_args = memdup_user(arg, sizeof(*vol_args));
 817         if (IS_ERR(vol_args))
 818                 return PTR_ERR(vol_args);
 819
 820         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
 821         namelen = strlen(vol_args->name);
 822         if (strchr(vol_args->name, '/')) {
 823                 ret = -EINVAL;
 824                 goto out;
 825         }
 826
 827         if (subvol) {
 828                 ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen,
 829                                      NULL);
 830         } else {
 831                 struct inode *src_inode;
 832                 src_file = fget(vol_args->fd);
 833                 if (!src_file) {
 834                         ret = -EINVAL;
 835                         goto out;
 836                 }
 837
 838                 src_inode = src_file->f_path.dentry->d_inode;
 839                 if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) {
 840                         printk(KERN_INFO "btrfs: Snapshot src from "
 841                                "another FS\n");
 842                         ret = -EINVAL;
 843                         fput(src_file);
 844                         goto out;
 845                 }
 846                 ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen,
 847                                      BTRFS_I(src_inode)->root);
 848                 fput(src_file);
 849         }
 850 out:
 851         kfree(vol_args);
 852         return ret;
 853 }
 854
 855 /*
 856  * helper to check if the subvolume references other subvolumes
 857  */
 858 static noinline int may_destroy_subvol(struct btrfs_root *root)
 859 {
 860         struct btrfs_path *path;
 861         struct btrfs_key key;
 862         int ret;
 863
 864         path = btrfs_alloc_path();
 865         if (!path)
 866                 return -ENOMEM;
 867
 868         key.objectid = root->root_key.objectid;
 869         key.type = BTRFS_ROOT_REF_KEY;
 870         key.offset = (u64)-1;
 871
 872         ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
 873                                 &key, path, 0, 0);
 874         if (ret < 0)
 875                 goto out;
 876         BUG_ON(ret == 0);
 877
 878         ret = 0;
 879         if (path->slots[0] > 0) {
 880                 path->slots[0]--;
 881                 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
 882                 if (key.objectid == root->root_key.objectid &&
 883                     key.type == BTRFS_ROOT_REF_KEY)
 884                         ret = -ENOTEMPTY;
 885         }
 886 out:
 887         btrfs_free_path(path);
 888         return ret;
 889 }
 890
 891 static noinline int key_in_sk(struct btrfs_key *key,
 892                               struct btrfs_ioctl_search_key *sk)
 893 {
 894         struct btrfs_key test;
 895         int ret;
 896
 897         test.objectid = sk->min_objectid;
 898         test.type = sk->min_type;
 899         test.offset = sk->min_offset;
 900
 901         ret = btrfs_comp_cpu_keys(key, &test);
 902         if (ret < 0)
 903                 return 0;
 904
 905         test.objectid = sk->max_objectid;
 906         test.type = sk->max_type;
 907         test.offset = sk->max_offset;
 908
 909         ret = btrfs_comp_cpu_keys(key, &test);
 910         if (ret > 0)
 911                 return 0;
 912         return 1;
 913 }
 914
 915 static noinline int copy_to_sk(struct btrfs_root *root,
 916                                struct btrfs_path *path,
 917                                struct btrfs_key *key,
 918                                struct btrfs_ioctl_search_key *sk,
 919                                char *buf,
 920                                unsigned long *sk_offset,
 921                                int *num_found)
 922 {
 923         u64 found_transid;
 924         struct extent_buffer *leaf;
 925         struct btrfs_ioctl_search_header sh;
 926         unsigned long item_off;
 927         unsigned long item_len;
 928         int nritems;
 929         int i;
 930         int slot;
 931         int found = 0;
 932         int ret = 0;
 933
 934         leaf = path->nodes[0];
 935         slot = path->slots[0];
 936         nritems = btrfs_header_nritems(leaf);
 937
 938         if (btrfs_header_generation(leaf) > sk->max_transid) {
 939                 i = nritems;
 940                 goto advance_key;
 941         }
 942         found_transid = btrfs_header_generation(leaf);
 943
 944         for (i = slot; i < nritems; i++) {
 945                 item_off = btrfs_item_ptr_offset(leaf, i);
 946                 item_len = btrfs_item_size_nr(leaf, i);
 947
 948                 if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
 949                         item_len = 0;
 950
 951                 if (sizeof(sh) + item_len + *sk_offset >
 952                     BTRFS_SEARCH_ARGS_BUFSIZE) {
 953                         ret = 1;
 954                         goto overflow;
 955                 }
 956
 957                 btrfs_item_key_to_cpu(leaf, key, i);
 958                 if (!key_in_sk(key, sk))
 959                         continue;
 960
 961                 sh.objectid = key->objectid;
 962                 sh.offset = key->offset;
 963                 sh.type = key->type;
 964                 sh.len = item_len;
 965                 sh.transid = found_transid;
 966
 967                 /* copy search result header */
 968                 memcpy(buf + *sk_offset, &sh, sizeof(sh));
 969                 *sk_offset += sizeof(sh);
 970
 971                 if (item_len) {
 972                         char *p = buf + *sk_offset;
 973                         /* copy the item */
 974                         read_extent_buffer(leaf, p,
 975                                            item_off, item_len);
 976                         *sk_offset += item_len;
 977                 }
 978                 found++;
 979
 980                 if (*num_found >= sk->nr_items)
 981                         break;
 982         }
 983 advance_key:
 984         ret = 0;
 985         if (key->offset < (u64)-1 && key->offset < sk->max_offset)
 986                 key->offset++;
 987         else if (key->type < (u8)-1 && key->type < sk->max_type) {
 988                 key->offset = 0;
 989                 key->type++;
 990         } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
 991                 key->offset = 0;
 992                 key->type = 0;
 993                 key->objectid++;
 994         } else
 995                 ret = 1;
 996 overflow:
 997         *num_found += found;
 998         return ret;
 999 }
1000
1001 static noinline int search_ioctl(struct inode *inode,
1002                                  struct btrfs_ioctl_search_args *args)
1003 {
1004         struct btrfs_root *root;
1005         struct btrfs_key key;
1006         struct btrfs_key max_key;
1007         struct btrfs_path *path;
1008         struct btrfs_ioctl_search_key *sk = &args->key;
1009         struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
1010         int ret;
1011         int num_found = 0;
1012         unsigned long sk_offset = 0;
1013
1014         path = btrfs_alloc_path();
1015         if (!path)
1016                 return -ENOMEM;
1017
1018         if (sk->tree_id == 0) {
1019                 /* search the root of the inode that was passed */
1020                 root = BTRFS_I(inode)->root;
1021         } else {
1022                 key.objectid = sk->tree_id;
1023                 key.type = BTRFS_ROOT_ITEM_KEY;
1024                 key.offset = (u64)-1;
1025                 root = btrfs_read_fs_root_no_name(info, &key);
1026                 if (IS_ERR(root)) {
1027                         printk(KERN_ERR "could not find root %llu\n",
1028                                sk->tree_id);
1029                         btrfs_free_path(path);
1030                         return -ENOENT;
1031                 }
1032         }
1033
1034         key.objectid = sk->min_objectid;
1035         key.type = sk->min_type;
1036         key.offset = sk->min_offset;
1037
1038         max_key.objectid = sk->max_objectid;
1039         max_key.type = sk->max_type;
1040         max_key.offset = sk->max_offset;
1041
1042         path->keep_locks = 1;
1043
1044         while(1) {
1045                 ret = btrfs_search_forward(root, &key, &max_key, path, 0,
1046                                            sk->min_transid);
1047                 if (ret != 0) {
1048                         if (ret > 0)
1049                                 ret = 0;
1050                         goto err;
1051                 }
1052                 ret = copy_to_sk(root, path, &key, sk, args->buf,
1053                                  &sk_offset, &num_found);
1054                 btrfs_release_path(root, path);
1055                 if (ret || num_found >= sk->nr_items)
1056                         break;
1057
1058         }
1059         ret = 0;
1060 err:
1061         sk->nr_items = num_found;
1062         btrfs_free_path(path);
1063         return ret;
1064 }
1065
1066 static noinline int btrfs_ioctl_tree_search(struct file *file,
1067                                            void __user *argp)
1068 {
1069          struct btrfs_ioctl_search_args *args;
1070          struct inode *inode;
1071          int ret;
1072
1073         if (!capable(CAP_SYS_ADMIN))
1074                 return -EPERM;
1075
1076         args = kmalloc(sizeof(*args), GFP_KERNEL);
1077         if (!args)
1078                 return -ENOMEM;
1079
1080         if (copy_from_user(args, argp, sizeof(*args))) {
1081                 kfree(args);
1082                 return -EFAULT;
1083         }
1084         inode = fdentry(file)->d_inode;
1085         ret = search_ioctl(inode, args);
1086         if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
1087                 ret = -EFAULT;
1088         kfree(args);
1089         return ret;
1090 }
1091
1092 /*
1093  * Search INODE_REFs to identify path name of 'dirid' directory
1094  * in a 'tree_id' tree. and sets path name to 'name'.
1095  */
1096 static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
1097                                 u64 tree_id, u64 dirid, char *name)
1098 {
1099         struct btrfs_root *root;
1100         struct btrfs_key key;
1101         char *ptr;
1102         int ret = -1;
1103         int slot;
1104         int len;
1105         int total_len = 0;
1106         struct btrfs_inode_ref *iref;
1107         struct extent_buffer *l;
1108         struct btrfs_path *path;
1109
1110         if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
1111                 name[0]='\0';
1112                 return 0;
1113         }
1114
1115         path = btrfs_alloc_path();
1116         if (!path)
1117                 return -ENOMEM;
1118
1119         ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
1120
1121         key.objectid = tree_id;
1122         key.type = BTRFS_ROOT_ITEM_KEY;
1123         key.offset = (u64)-1;
1124         root = btrfs_read_fs_root_no_name(info, &key);
1125         if (IS_ERR(root)) {
1126                 printk(KERN_ERR "could not find root %llu\n", tree_id);
1127                 ret = -ENOENT;
1128                 goto out;
1129         }
1130
1131         key.objectid = dirid;
1132         key.type = BTRFS_INODE_REF_KEY;
1133         key.offset = (u64)-1;
1134
1135         while(1) {
1136                 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1137                 if (ret < 0)
1138                         goto out;
1139
1140                 l = path->nodes[0];
1141                 slot = path->slots[0];
1142                 if (ret > 0 && slot > 0)
1143                         slot--;
1144                 btrfs_item_key_to_cpu(l, &key, slot);
1145
1146                 if (ret > 0 && (key.objectid != dirid ||
1147                                 key.type != BTRFS_INODE_REF_KEY)) {
1148                         ret = -ENOENT;
1149                         goto out;
1150                 }
1151
1152                 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
1153                 len = btrfs_inode_ref_name_len(l, iref);
1154                 ptr -= len + 1;
1155                 total_len += len + 1;
1156                 if (ptr < name)
1157                         goto out;
1158
1159                 *(ptr + len) = '/';
1160                 read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len);
1161
1162                 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
1163                         break;
1164
1165                 btrfs_release_path(root, path);
1166                 key.objectid = key.offset;
1167                 key.offset = (u64)-1;
1168                 dirid = key.objectid;
1169
1170         }
1171         if (ptr < name)
1172                 goto out;
1173         memcpy(name, ptr, total_len);
1174         name[total_len]='\0';
1175         ret = 0;
1176 out:
1177         btrfs_free_path(path);
1178         return ret;
1179 }
1180
1181 static noinline int btrfs_ioctl_ino_lookup(struct file *file,
1182                                            void __user *argp)
1183 {
1184          struct btrfs_ioctl_ino_lookup_args *args;
1185          struct inode *inode;
1186          int ret;
1187
1188         if (!capable(CAP_SYS_ADMIN))
1189                 return -EPERM;
1190
1191         args = kmalloc(sizeof(*args), GFP_KERNEL);
1192         if (!args)
1193                 return -ENOMEM;
1194
1195         if (copy_from_user(args, argp, sizeof(*args))) {
1196                 kfree(args);
1197                 return -EFAULT;
1198         }
1199         inode = fdentry(file)->d_inode;
1200
1201         if (args->treeid == 0)
1202                 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
1203
1204         ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
1205                                         args->treeid, args->objectid,
1206                                         args->name);
1207
1208         if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
1209                 ret = -EFAULT;
1210
1211         kfree(args);
1212         return ret;
1213 }
1214
1215 static noinline int btrfs_ioctl_snap_destroy(struct file *file,
1216                                              void __user *arg)
1217 {
1218         struct dentry *parent = fdentry(file);
1219         struct dentry *dentry;
1220         struct inode *dir = parent->d_inode;
1221         struct inode *inode;
1222         struct btrfs_root *root = BTRFS_I(dir)->root;
1223         struct btrfs_root *dest = NULL;
1224         struct btrfs_ioctl_vol_args *vol_args;
1225         struct btrfs_trans_handle *trans;
1226         int namelen;
1227         int ret;
1228         int err = 0;
1229
1230         if (!capable(CAP_SYS_ADMIN))
1231                 return -EPERM;
1232
1233         vol_args = memdup_user(arg, sizeof(*vol_args));
1234         if (IS_ERR(vol_args))
1235                 return PTR_ERR(vol_args);
1236
1237         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1238         namelen = strlen(vol_args->name);
1239         if (strchr(vol_args->name, '/') ||
1240             strncmp(vol_args->name, "..", namelen) == 0) {
1241                 err = -EINVAL;
1242                 goto out;
1243         }
1244
1245         err = mnt_want_write(file->f_path.mnt);
1246         if (err)
1247                 goto out;
1248
1249         mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
1250         dentry = lookup_one_len(vol_args->name, parent, namelen);
1251         if (IS_ERR(dentry)) {
1252                 err = PTR_ERR(dentry);
1253                 goto out_unlock_dir;
1254         }
1255
1256         if (!dentry->d_inode) {
1257                 err = -ENOENT;
1258                 goto out_dput;
1259         }
1260
1261         inode = dentry->d_inode;
1262         if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) {
1263                 err = -EINVAL;
1264                 goto out_dput;
1265         }
1266
1267         dest = BTRFS_I(inode)->root;
1268
1269         mutex_lock(&inode->i_mutex);
1270         err = d_invalidate(dentry);
1271         if (err)
1272                 goto out_unlock;
1273
1274         down_write(&root->fs_info->subvol_sem);
1275
1276         err = may_destroy_subvol(dest);
1277         if (err)
1278                 goto out_up_write;
1279
1280         trans = btrfs_start_transaction(root, 0);
1281         if (IS_ERR(trans)) {
1282                 err = PTR_ERR(trans);
1283                 goto out;
1284         }
1285         trans->block_rsv = &root->fs_info->global_block_rsv;
1286
1287         ret = btrfs_unlink_subvol(trans, root, dir,
1288                                 dest->root_key.objectid,
1289                                 dentry->d_name.name,
1290                                 dentry->d_name.len);
1291         BUG_ON(ret);
1292
1293         btrfs_record_root_in_trans(trans, dest);
1294
1295         memset(&dest->root_item.drop_progress, 0,
1296                 sizeof(dest->root_item.drop_progress));
1297         dest->root_item.drop_level = 0;
1298         btrfs_set_root_refs(&dest->root_item, 0);
1299
1300         if (!xchg(&dest->orphan_item_inserted, 1)) {
1301                 ret = btrfs_insert_orphan_item(trans,
1302                                         root->fs_info->tree_root,
1303                                         dest->root_key.objectid);
1304                 BUG_ON(ret);
1305         }
1306
1307         ret = btrfs_commit_transaction(trans, root);
1308         BUG_ON(ret);
1309         inode->i_flags |= S_DEAD;
1310 out_up_write:
1311         up_write(&root->fs_info->subvol_sem);
1312 out_unlock:
1313         mutex_unlock(&inode->i_mutex);
1314         if (!err) {
1315                 shrink_dcache_sb(root->fs_info->sb);
1316                 btrfs_invalidate_inodes(dest);
1317                 d_delete(dentry);
1318         }
1319 out_dput:
1320         dput(dentry);
1321 out_unlock_dir:
1322         mutex_unlock(&dir->i_mutex);
1323         mnt_drop_write(file->f_path.mnt);
1324 out:
1325         kfree(vol_args);
1326         return err;
1327 }
1328
1329 static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
1330 {
1331         struct inode *inode = fdentry(file)->d_inode;
1332         struct btrfs_root *root = BTRFS_I(inode)->root;
1333         struct btrfs_ioctl_defrag_range_args *range;
1334         int ret;
1335
1336         ret = mnt_want_write(file->f_path.mnt);
1337         if (ret)
1338                 return ret;
1339
1340         switch (inode->i_mode & S_IFMT) {
1341         case S_IFDIR:
1342                 if (!capable(CAP_SYS_ADMIN)) {
1343                         ret = -EPERM;
1344                         goto out;
1345                 }
1346                 ret = btrfs_defrag_root(root, 0);
1347                 if (ret)
1348                         goto out;
1349                 ret = btrfs_defrag_root(root->fs_info->extent_root, 0);
1350                 break;
1351         case S_IFREG:
1352                 if (!(file->f_mode & FMODE_WRITE)) {
1353                         ret = -EINVAL;
1354                         goto out;
1355                 }
1356
1357                 range = kzalloc(sizeof(*range), GFP_KERNEL);
1358                 if (!range) {
1359                         ret = -ENOMEM;
1360                         goto out;
1361                 }
1362
1363                 if (argp) {
1364                         if (copy_from_user(range, argp,
1365                                            sizeof(*range))) {
1366                                 ret = -EFAULT;
1367                                 kfree(range);
1368                                 goto out;
1369                         }
1370                         /* compression requires us to start the IO */
1371                         if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
1372                                 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
1373                                 range->extent_thresh = (u32)-1;
1374                         }
1375                 } else {
1376                         /* the rest are all set to zero by kzalloc */
1377                         range->len = (u64)-1;
1378                 }
1379                 ret = btrfs_defrag_file(file, range);
1380                 kfree(range);
1381                 break;
1382         default:
1383                 ret = -EINVAL;
1384         }
1385 out:
1386         mnt_drop_write(file->f_path.mnt);
1387         return ret;
1388 }
1389
1390 static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
1391 {
1392         struct btrfs_ioctl_vol_args *vol_args;
1393         int ret;
1394
1395         if (!capable(CAP_SYS_ADMIN))
1396                 return -EPERM;
1397
1398         vol_args = memdup_user(arg, sizeof(*vol_args));
1399         if (IS_ERR(vol_args))
1400                 return PTR_ERR(vol_args);
1401
1402         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1403         ret = btrfs_init_new_device(root, vol_args->name);
1404
1405         kfree(vol_args);
1406         return ret;
1407 }
1408
1409 static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
1410 {
1411         struct btrfs_ioctl_vol_args *vol_args;
1412         int ret;
1413
1414         if (!capable(CAP_SYS_ADMIN))
1415                 return -EPERM;
1416
1417         if (root->fs_info->sb->s_flags & MS_RDONLY)
1418                 return -EROFS;
1419
1420         vol_args = memdup_user(arg, sizeof(*vol_args));
1421         if (IS_ERR(vol_args))
1422                 return PTR_ERR(vol_args);
1423
1424         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1425         ret = btrfs_rm_device(root, vol_args->name);
1426
1427         kfree(vol_args);
1428         return ret;
1429 }
1430
1431 static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
1432                                        u64 off, u64 olen, u64 destoff)
1433 {
1434         struct inode *inode = fdentry(file)->d_inode;
1435         struct btrfs_root *root = BTRFS_I(inode)->root;
1436         struct file *src_file;
1437         struct inode *src;
1438         struct btrfs_trans_handle *trans;
1439         struct btrfs_path *path;
1440         struct extent_buffer *leaf;
1441         char *buf;
1442         struct btrfs_key key;
1443         u32 nritems;
1444         int slot;
1445         int ret;
1446         u64 len = olen;
1447         u64 bs = root->fs_info->sb->s_blocksize;
1448         u64 hint_byte;
1449
1450         /*
1451          * TODO:
1452          * - split compressed inline extents.  annoying: we need to
1453          *   decompress into destination's address_space (the file offset
1454          *   may change, so source mapping won't do), then recompress (or
1455          *   otherwise reinsert) a subrange.
1456          * - allow ranges within the same file to be cloned (provided
1457          *   they don't overlap)?
1458          */
1459
1460         /* the destination must be opened for writing */
1461         if (!(file->f_mode & FMODE_WRITE))
1462                 return -EINVAL;
1463
1464         ret = mnt_want_write(file->f_path.mnt);
1465         if (ret)
1466                 return ret;
1467
1468         src_file = fget(srcfd);
1469         if (!src_file) {
1470                 ret = -EBADF;
1471                 goto out_drop_write;
1472         }
1473
1474         src = src_file->f_dentry->d_inode;
1475
1476         ret = -EINVAL;
1477         if (src == inode)
1478                 goto out_fput;
1479
1480         /* the src must be open for reading */
1481         if (!(src_file->f_mode & FMODE_READ))
1482                 goto out_fput;
1483
1484         ret = -EISDIR;
1485         if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
1486                 goto out_fput;
1487
1488         ret = -EXDEV;
1489         if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root)
1490                 goto out_fput;
1491
1492         ret = -ENOMEM;
1493         buf = vmalloc(btrfs_level_size(root, 0));
1494         if (!buf)
1495                 goto out_fput;
1496
1497         path = btrfs_alloc_path();
1498         if (!path) {
1499                 vfree(buf);
1500                 goto out_fput;
1501         }
1502         path->reada = 2;
1503
1504         if (inode < src) {
1505                 mutex_lock(&inode->i_mutex);
1506                 mutex_lock(&src->i_mutex);
1507         } else {
1508                 mutex_lock(&src->i_mutex);
1509                 mutex_lock(&inode->i_mutex);
1510         }
1511
1512         /* determine range to clone */
1513         ret = -EINVAL;
1514         if (off >= src->i_size || off + len > src->i_size)
1515                 goto out_unlock;
1516         if (len == 0)
1517                 olen = len = src->i_size - off;
1518         /* if we extend to eof, continue to block boundary */
1519         if (off + len == src->i_size)
1520                 len = ((src->i_size + bs-1) & ~(bs-1))
1521                         - off;
1522
1523         /* verify the end result is block aligned */
1524         if ((off & (bs-1)) ||
1525             ((off + len) & (bs-1)))
1526                 goto out_unlock;
1527
1528         /* do any pending delalloc/csum calc on src, one way or
1529            another, and lock file content */
1530         while (1) {
1531                 struct btrfs_ordered_extent *ordered;
1532                 lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
1533                 ordered = btrfs_lookup_first_ordered_extent(inode, off+len);
1534                 if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered)
1535                         break;
1536                 unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
1537                 if (ordered)
1538                         btrfs_put_ordered_extent(ordered);
1539                 btrfs_wait_ordered_range(src, off, off+len);
1540         }
1541
1542         /* clone data */
1543         key.objectid = src->i_ino;
1544         key.type = BTRFS_EXTENT_DATA_KEY;
1545         key.offset = 0;
1546
1547         while (1) {
1548                 /*
1549                  * note the key will change type as we walk through the
1550                  * tree.
1551                  */
1552                 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1553                 if (ret < 0)
1554                         goto out;
1555
1556                 nritems = btrfs_header_nritems(path->nodes[0]);
1557                 if (path->slots[0] >= nritems) {
1558                         ret = btrfs_next_leaf(root, path);
1559                         if (ret < 0)
1560                                 goto out;
1561                         if (ret > 0)
1562                                 break;
1563                         nritems = btrfs_header_nritems(path->nodes[0]);
1564                 }
1565                 leaf = path->nodes[0];
1566                 slot = path->slots[0];
1567
1568                 btrfs_item_key_to_cpu(leaf, &key, slot);
1569                 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
1570                     key.objectid != src->i_ino)
1571                         break;
1572
1573                 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
1574                         struct btrfs_file_extent_item *extent;
1575                         int type;
1576                         u32 size;
1577                         struct btrfs_key new_key;
1578                         u64 disko = 0, diskl = 0;
1579                         u64 datao = 0, datal = 0;
1580                         u8 comp;
1581
1582                         size = btrfs_item_size_nr(leaf, slot);
1583                         read_extent_buffer(leaf, buf,
1584                                            btrfs_item_ptr_offset(leaf, slot),
1585                                            size);
1586
1587                         extent = btrfs_item_ptr(leaf, slot,
1588                                                 struct btrfs_file_extent_item);
1589                         comp = btrfs_file_extent_compression(leaf, extent);
1590                         type = btrfs_file_extent_type(leaf, extent);
1591                         if (type == BTRFS_FILE_EXTENT_REG ||
1592                             type == BTRFS_FILE_EXTENT_PREALLOC) {
1593                                 disko = btrfs_file_extent_disk_bytenr(leaf,
1594                                                                       extent);
1595                                 diskl = btrfs_file_extent_disk_num_bytes(leaf,
1596                                                                  extent);
1597                                 datao = btrfs_file_extent_offset(leaf, extent);
1598                                 datal = btrfs_file_extent_num_bytes(leaf,
1599                                                                     extent);
1600                         } else if (type == BTRFS_FILE_EXTENT_INLINE) {
1601                                 /* take upper bound, may be compressed */
1602                                 datal = btrfs_file_extent_ram_bytes(leaf,
1603                                                                     extent);
1604                         }
1605                         btrfs_release_path(root, path);
1606
1607                         if (key.offset + datal < off ||
1608                             key.offset >= off+len)
1609                                 goto next;
1610
1611                         memcpy(&new_key, &key, sizeof(new_key));
1612                         new_key.objectid = inode->i_ino;
1613                         new_key.offset = key.offset + destoff - off;
1614
1615                         trans = btrfs_start_transaction(root, 1);
1616                         if (IS_ERR(trans)) {
1617                                 ret = PTR_ERR(trans);
1618                                 goto out;
1619                         }
1620
1621                         if (type == BTRFS_FILE_EXTENT_REG ||
1622                             type == BTRFS_FILE_EXTENT_PREALLOC) {
1623                                 if (off > key.offset) {
1624                                         datao += off - key.offset;
1625                                         datal -= off - key.offset;
1626                                 }
1627
1628                                 if (key.offset + datal > off + len)
1629                                         datal = off + len - key.offset;
1630
1631                                 ret = btrfs_drop_extents(trans, inode,
1632                                                          new_key.offset,
1633                                                          new_key.offset + datal,
1634                                                          &hint_byte, 1);
1635                                 BUG_ON(ret);
1636
1637                                 ret = btrfs_insert_empty_item(trans, root, path,
1638                                                               &new_key, size);
1639                                 BUG_ON(ret);
1640
1641                                 leaf = path->nodes[0];
1642                                 slot = path->slots[0];
1643                                 write_extent_buffer(leaf, buf,
1644                                             btrfs_item_ptr_offset(leaf, slot),
1645                                             size);
1646
1647                                 extent = btrfs_item_ptr(leaf, slot,
1648                                                 struct btrfs_file_extent_item);
1649
1650                                 /* disko == 0 means it's a hole */
1651                                 if (!disko)
1652                                         datao = 0;
1653
1654                                 btrfs_set_file_extent_offset(leaf, extent,
1655                                                              datao);
1656                                 btrfs_set_file_extent_num_bytes(leaf, extent,
1657                                                                 datal);
1658                                 if (disko) {
1659                                         inode_add_bytes(inode, datal);
1660                                         ret = btrfs_inc_extent_ref(trans, root,
1661                                                         disko, diskl, 0,
1662                                                         root->root_key.objectid,
1663                                                         inode->i_ino,
1664                                                         new_key.offset - datao);
1665                                         BUG_ON(ret);
1666                                 }
1667                         } else if (type == BTRFS_FILE_EXTENT_INLINE) {
1668                                 u64 skip = 0;
1669                                 u64 trim = 0;
1670                                 if (off > key.offset) {
1671                                         skip = off - key.offset;
1672                                         new_key.offset += skip;
1673                                 }
1674
1675                                 if (key.offset + datal > off+len)
1676                                         trim = key.offset + datal - (off+len);
1677
1678                                 if (comp && (skip || trim)) {
1679                                         ret = -EINVAL;
1680                                         btrfs_end_transaction(trans, root);
1681                                         goto out;
1682                                 }
1683                                 size -= skip + trim;
1684                                 datal -= skip + trim;
1685
1686                                 ret = btrfs_drop_extents(trans, inode,
1687                                                          new_key.offset,
1688                                                          new_key.offset + datal,
1689                                                          &hint_byte, 1);
1690                                 BUG_ON(ret);
1691
1692                                 ret = btrfs_insert_empty_item(trans, root, path,
1693                                                               &new_key, size);
1694                                 BUG_ON(ret);
1695
1696                                 if (skip) {
1697                                         u32 start =
1698                                           btrfs_file_extent_calc_inline_size(0);
1699                                         memmove(buf+start, buf+start+skip,
1700                                                 datal);
1701                                 }
1702
1703                                 leaf = path->nodes[0];
1704                                 slot = path->slots[0];
1705                                 write_extent_buffer(leaf, buf,
1706                                             btrfs_item_ptr_offset(leaf, slot),
1707                                             size);
1708                                 inode_add_bytes(inode, datal);
1709                         }
1710
1711                         btrfs_mark_buffer_dirty(leaf);
1712                         btrfs_release_path(root, path);
1713
1714                         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1715                         if (new_key.offset + datal > inode->i_size)
1716                                 btrfs_i_size_write(inode,
1717                                                    new_key.offset + datal);
1718                         BTRFS_I(inode)->flags = BTRFS_I(src)->flags;
1719                         ret = btrfs_update_inode(trans, root, inode);
1720                         BUG_ON(ret);
1721                         btrfs_end_transaction(trans, root);
1722                 }
1723 next:
1724                 btrfs_release_path(root, path);
1725                 key.offset++;
1726         }
1727         ret = 0;
1728 out:
1729         btrfs_release_path(root, path);
1730         unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
1731 out_unlock:
1732         mutex_unlock(&src->i_mutex);
1733         mutex_unlock(&inode->i_mutex);
1734         vfree(buf);
1735         btrfs_free_path(path);
1736 out_fput:
1737         fput(src_file);
1738 out_drop_write:
1739         mnt_drop_write(file->f_path.mnt);
1740         return ret;
1741 }
1742
1743 static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
1744 {
1745         struct btrfs_ioctl_clone_range_args args;
1746
1747         if (copy_from_user(&args, argp, sizeof(args)))
1748                 return -EFAULT;
1749         return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
1750                                  args.src_length, args.dest_offset);
1751 }
1752
1753 /*
1754  * there are many ways the trans_start and trans_end ioctls can lead
1755  * to deadlocks.  They should only be used by applications that
1756  * basically own the machine, and have a very in depth understanding
1757  * of all the possible deadlocks and enospc problems.
1758  */
1759 static long btrfs_ioctl_trans_start(struct file *file)
1760 {
1761         struct inode *inode = fdentry(file)->d_inode;
1762         struct btrfs_root *root = BTRFS_I(inode)->root;
1763         struct btrfs_trans_handle *trans;
1764         int ret;
1765
1766         ret = -EPERM;
1767         if (!capable(CAP_SYS_ADMIN))
1768                 goto out;
1769
1770         ret = -EINPROGRESS;
1771         if (file->private_data)
1772                 goto out;
1773
1774         ret = mnt_want_write(file->f_path.mnt);
1775         if (ret)
1776                 goto out;
1777
1778         mutex_lock(&root->fs_info->trans_mutex);
1779         root->fs_info->open_ioctl_trans++;
1780         mutex_unlock(&root->fs_info->trans_mutex);
1781
1782         ret = -ENOMEM;
1783         trans = btrfs_start_ioctl_transaction(root, 0);
1784         if (!trans)
1785                 goto out_drop;
1786
1787         file->private_data = trans;
1788         return 0;
1789
1790 out_drop:
1791         mutex_lock(&root->fs_info->trans_mutex);
1792         root->fs_info->open_ioctl_trans--;
1793         mutex_unlock(&root->fs_info->trans_mutex);
1794         mnt_drop_write(file->f_path.mnt);
1795 out:
1796         return ret;
1797 }
1798
1799 static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
1800 {
1801         struct inode *inode = fdentry(file)->d_inode;
1802         struct btrfs_root *root = BTRFS_I(inode)->root;
1803         struct btrfs_root *new_root;
1804         struct btrfs_dir_item *di;
1805         struct btrfs_trans_handle *trans;
1806         struct btrfs_path *path;
1807         struct btrfs_key location;
1808         struct btrfs_disk_key disk_key;
1809         struct btrfs_super_block *disk_super;
1810         u64 features;
1811         u64 objectid = 0;
1812         u64 dir_id;
1813
1814         if (!capable(CAP_SYS_ADMIN))
1815                 return -EPERM;
1816
1817         if (copy_from_user(&objectid, argp, sizeof(objectid)))
1818                 return -EFAULT;
1819
1820         if (!objectid)
1821                 objectid = root->root_key.objectid;
1822
1823         location.objectid = objectid;
1824         location.type = BTRFS_ROOT_ITEM_KEY;
1825         location.offset = (u64)-1;
1826
1827         new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
1828         if (IS_ERR(new_root))
1829                 return PTR_ERR(new_root);
1830
1831         if (btrfs_root_refs(&new_root->root_item) == 0)
1832                 return -ENOENT;
1833
1834         path = btrfs_alloc_path();
1835         if (!path)
1836                 return -ENOMEM;
1837         path->leave_spinning = 1;
1838
1839         trans = btrfs_start_transaction(root, 1);
1840         if (!trans) {
1841                 btrfs_free_path(path);
1842                 return -ENOMEM;
1843         }
1844
1845         dir_id = btrfs_super_root_dir(&root->fs_info->super_copy);
1846         di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
1847                                    dir_id, "default", 7, 1);
1848         if (!di) {
1849                 btrfs_free_path(path);
1850                 btrfs_end_transaction(trans, root);
1851                 printk(KERN_ERR "Umm, you don't have the default dir item, "
1852                        "this isn't going to work\n");
1853                 return -ENOENT;
1854         }
1855
1856         btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
1857         btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
1858         btrfs_mark_buffer_dirty(path->nodes[0]);
1859         btrfs_free_path(path);
1860
1861         disk_super = &root->fs_info->super_copy;
1862         features = btrfs_super_incompat_flags(disk_super);
1863         if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) {
1864                 features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL;
1865                 btrfs_set_super_incompat_flags(disk_super, features);
1866         }
1867         btrfs_end_transaction(trans, root);
1868
1869         return 0;
1870 }
1871
1872 long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
1873 {
1874         struct btrfs_ioctl_space_args space_args;
1875         struct btrfs_ioctl_space_info space;
1876         struct btrfs_ioctl_space_info *dest;
1877         struct btrfs_ioctl_space_info *dest_orig;
1878         struct btrfs_ioctl_space_info *user_dest;
1879         struct btrfs_space_info *info;
1880         int alloc_size;
1881         int ret = 0;
1882         int slot_count = 0;
1883
1884         if (copy_from_user(&space_args,
1885                            (struct btrfs_ioctl_space_args __user *)arg,
1886                            sizeof(space_args)))
1887                 return -EFAULT;
1888
1889         /* first we count slots */
1890         rcu_read_lock();
1891         list_for_each_entry_rcu(info, &root->fs_info->space_info, list)
1892                 slot_count++;
1893         rcu_read_unlock();
1894
1895         /* space_slots == 0 means they are asking for a count */
1896         if (space_args.space_slots == 0) {
1897                 space_args.total_spaces = slot_count;
1898                 goto out;
1899         }
1900         alloc_size = sizeof(*dest) * slot_count;
1901         /* we generally have at most 6 or so space infos, one for each raid
1902          * level.  So, a whole page should be more than enough for everyone
1903          */
1904         if (alloc_size > PAGE_CACHE_SIZE)
1905                 return -ENOMEM;
1906
1907         space_args.total_spaces = 0;
1908         dest = kmalloc(alloc_size, GFP_NOFS);
1909         if (!dest)
1910                 return -ENOMEM;
1911         dest_orig = dest;
1912
1913         /* now we have a buffer to copy into */
1914         rcu_read_lock();
1915         list_for_each_entry_rcu(info, &root->fs_info->space_info, list) {
1916                 /* make sure we don't copy more than we allocated
1917                  * in our buffer
1918                  */
1919                 if (slot_count == 0)
1920                         break;
1921                 slot_count--;
1922
1923                 /* make sure userland has enough room in their buffer */
1924                 if (space_args.total_spaces >= space_args.space_slots)
1925                         break;
1926
1927                 space.flags = info->flags;
1928                 space.total_bytes = info->total_bytes;
1929                 space.used_bytes = info->bytes_used;
1930                 memcpy(dest, &space, sizeof(space));
1931                 dest++;
1932                 space_args.total_spaces++;
1933         }
1934         rcu_read_unlock();
1935
1936         user_dest = (struct btrfs_ioctl_space_info *)
1937                 (arg + sizeof(struct btrfs_ioctl_space_args));
1938
1939         if (copy_to_user(user_dest, dest_orig, alloc_size))
1940                 ret = -EFAULT;
1941
1942         kfree(dest_orig);
1943 out:
1944         if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
1945                 ret = -EFAULT;
1946
1947         return ret;
1948 }
1949
1950 /*
1951  * there are many ways the trans_start and trans_end ioctls can lead
1952  * to deadlocks.  They should only be used by applications that
1953  * basically own the machine, and have a very in depth understanding
1954  * of all the possible deadlocks and enospc problems.
1955  */
1956 long btrfs_ioctl_trans_end(struct file *file)
1957 {
1958         struct inode *inode = fdentry(file)->d_inode;
1959         struct btrfs_root *root = BTRFS_I(inode)->root;
1960         struct btrfs_trans_handle *trans;
1961
1962         trans = file->private_data;
1963         if (!trans)
1964                 return -EINVAL;
1965         file->private_data = NULL;
1966
1967         btrfs_end_transaction(trans, root);
1968
1969         mutex_lock(&root->fs_info->trans_mutex);
1970         root->fs_info->open_ioctl_trans--;
1971         mutex_unlock(&root->fs_info->trans_mutex);
1972
1973         mnt_drop_write(file->f_path.mnt);
1974         return 0;
1975 }
1976
1977 long btrfs_ioctl(struct file *file, unsigned int
1978                 cmd, unsigned long arg)
1979 {
1980         struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
1981         void __user *argp = (void __user *)arg;
1982
1983         switch (cmd) {
1984         case FS_IOC_GETFLAGS:
1985                 return btrfs_ioctl_getflags(file, argp);
1986         case FS_IOC_SETFLAGS:
1987                 return btrfs_ioctl_setflags(file, argp);
1988         case FS_IOC_GETVERSION:
1989                 return btrfs_ioctl_getversion(file, argp);
1990         case BTRFS_IOC_SNAP_CREATE:
1991                 return btrfs_ioctl_snap_create(file, argp, 0);
1992         case BTRFS_IOC_SUBVOL_CREATE:
1993                 return btrfs_ioctl_snap_create(file, argp, 1);
1994         case BTRFS_IOC_SNAP_DESTROY:
1995                 return btrfs_ioctl_snap_destroy(file, argp);
1996         case BTRFS_IOC_DEFAULT_SUBVOL:
1997                 return btrfs_ioctl_default_subvol(file, argp);
1998         case BTRFS_IOC_DEFRAG:
1999                 return btrfs_ioctl_defrag(file, NULL);
2000         case BTRFS_IOC_DEFRAG_RANGE:
2001                 return btrfs_ioctl_defrag(file, argp);
2002         case BTRFS_IOC_RESIZE:
2003                 return btrfs_ioctl_resize(root, argp);
2004         case BTRFS_IOC_ADD_DEV:
2005                 return btrfs_ioctl_add_dev(root, argp);
2006         case BTRFS_IOC_RM_DEV:
2007                 return btrfs_ioctl_rm_dev(root, argp);
2008         case BTRFS_IOC_BALANCE:
2009                 return btrfs_balance(root->fs_info->dev_root);
2010         case BTRFS_IOC_CLONE:
2011                 return btrfs_ioctl_clone(file, arg, 0, 0, 0);
2012         case BTRFS_IOC_CLONE_RANGE:
2013                 return btrfs_ioctl_clone_range(file, argp);
2014         case BTRFS_IOC_TRANS_START:
2015                 return btrfs_ioctl_trans_start(file);
2016         case BTRFS_IOC_TRANS_END:
2017                 return btrfs_ioctl_trans_end(file);
2018         case BTRFS_IOC_TREE_SEARCH:
2019                 return btrfs_ioctl_tree_search(file, argp);
2020         case BTRFS_IOC_INO_LOOKUP:
2021                 return btrfs_ioctl_ino_lookup(file, argp);
2022         case BTRFS_IOC_SPACE_INFO:
2023                 return btrfs_ioctl_space_info(root, argp);
2024         case BTRFS_IOC_SYNC:
2025                 btrfs_sync_fs(file->f_dentry->d_sb, 1);
2026                 return 0;
2027         }
2028
2029         return -ENOTTY;
2030 }