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         /*
 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, leaf->len);
 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         err = btrfs_commit_transaction(trans, root);
 346         if (err && !ret)
 347                 ret = err;
 348
 349         btrfs_unreserve_metadata_space(root, 6);
 350         return ret;
 351 }
 352
 353 static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
 354                            char *name, int namelen)
 355 {
 356         struct inode *inode;
 357         struct btrfs_pending_snapshot *pending_snapshot;
 358         struct btrfs_trans_handle *trans;
 359         int ret;
 360
 361         if (!root->ref_cows)
 362                 return -EINVAL;
 363
 364         /*
 365          * 1 - inode item
 366          * 2 - refs
 367          * 1 - root item
 368          * 2 - dir items
 369          */
 370         ret = btrfs_reserve_metadata_space(root, 6);
 371         if (ret)
 372                 goto fail;
 373
 374         pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
 375         if (!pending_snapshot) {
 376                 ret = -ENOMEM;
 377                 btrfs_unreserve_metadata_space(root, 6);
 378                 goto fail;
 379         }
 380         pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
 381         if (!pending_snapshot->name) {
 382                 ret = -ENOMEM;
 383                 kfree(pending_snapshot);
 384                 btrfs_unreserve_metadata_space(root, 6);
 385                 goto fail;
 386         }
 387         memcpy(pending_snapshot->name, name, namelen);
 388         pending_snapshot->name[namelen] = '\0';
 389         pending_snapshot->dentry = dentry;
 390         trans = btrfs_start_transaction(root, 1);
 391         BUG_ON(!trans);
 392         pending_snapshot->root = root;
 393         list_add(&pending_snapshot->list,
 394                  &trans->transaction->pending_snapshots);
 395         ret = btrfs_commit_transaction(trans, root);
 396         BUG_ON(ret);
 397         btrfs_unreserve_metadata_space(root, 6);
 398
 399         inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
 400         if (IS_ERR(inode)) {
 401                 ret = PTR_ERR(inode);
 402                 goto fail;
 403         }
 404         BUG_ON(!inode);
 405         d_instantiate(dentry, inode);
 406         ret = 0;
 407 fail:
 408         return ret;
 409 }
 410
 411 /* copy of may_create in fs/namei.c() */
 412 static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
 413 {
 414         if (child->d_inode)
 415                 return -EEXIST;
 416         if (IS_DEADDIR(dir))
 417                 return -ENOENT;
 418         return inode_permission(dir, MAY_WRITE | MAY_EXEC);
 419 }
 420
 421 /*
 422  * Create a new subvolume below @parent.  This is largely modeled after
 423  * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
 424  * inside this filesystem so it's quite a bit simpler.
 425  */
 426 static noinline int btrfs_mksubvol(struct path *parent,
 427                                    char *name, int namelen,
 428                                    struct btrfs_root *snap_src)
 429 {
 430         struct inode *dir  = parent->dentry->d_inode;
 431         struct dentry *dentry;
 432         int error;
 433
 434         mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
 435
 436         dentry = lookup_one_len(name, parent->dentry, namelen);
 437         error = PTR_ERR(dentry);
 438         if (IS_ERR(dentry))
 439                 goto out_unlock;
 440
 441         error = -EEXIST;
 442         if (dentry->d_inode)
 443                 goto out_dput;
 444
 445         error = mnt_want_write(parent->mnt);
 446         if (error)
 447                 goto out_dput;
 448
 449         error = btrfs_may_create(dir, dentry);
 450         if (error)
 451                 goto out_drop_write;
 452
 453         down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
 454
 455         if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
 456                 goto out_up_read;
 457
 458         if (snap_src) {
 459                 error = create_snapshot(snap_src, dentry,
 460                                         name, namelen);
 461         } else {
 462                 error = create_subvol(BTRFS_I(dir)->root, dentry,
 463                                       name, namelen);
 464         }
 465         if (!error)
 466                 fsnotify_mkdir(dir, dentry);
 467 out_up_read:
 468         up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
 469 out_drop_write:
 470         mnt_drop_write(parent->mnt);
 471 out_dput:
 472         dput(dentry);
 473 out_unlock:
 474         mutex_unlock(&dir->i_mutex);
 475         return error;
 476 }
 477
 478 static int should_defrag_range(struct inode *inode, u64 start, u64 len,
 479                                int thresh, u64 *last_len, u64 *skip,
 480                                u64 *defrag_end)
 481 {
 482         struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
 483         struct extent_map *em = NULL;
 484         struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
 485         int ret = 1;
 486
 487
 488         if (thresh == 0)
 489                 thresh = 256 * 1024;
 490
 491         /*
 492          * make sure that once we start defragging and extent, we keep on
 493          * defragging it
 494          */
 495         if (start < *defrag_end)
 496                 return 1;
 497
 498         *skip = 0;
 499
 500         /*
 501          * hopefully we have this extent in the tree already, try without
 502          * the full extent lock
 503          */
 504         read_lock(&em_tree->lock);
 505         em = lookup_extent_mapping(em_tree, start, len);
 506         read_unlock(&em_tree->lock);
 507
 508         if (!em) {
 509                 /* get the big lock and read metadata off disk */
 510                 lock_extent(io_tree, start, start + len - 1, GFP_NOFS);
 511                 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
 512                 unlock_extent(io_tree, start, start + len - 1, GFP_NOFS);
 513
 514                 if (IS_ERR(em))
 515                         return 0;
 516         }
 517
 518         /* this will cover holes, and inline extents */
 519         if (em->block_start >= EXTENT_MAP_LAST_BYTE)
 520                 ret = 0;
 521
 522         /*
 523          * we hit a real extent, if it is big don't bother defragging it again
 524          */
 525         if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh)
 526                 ret = 0;
 527
 528         /*
 529          * last_len ends up being a counter of how many bytes we've defragged.
 530          * every time we choose not to defrag an extent, we reset *last_len
 531          * so that the next tiny extent will force a defrag.
 532          *
 533          * The end result of this is that tiny extents before a single big
 534          * extent will force at least part of that big extent to be defragged.
 535          */
 536         if (ret) {
 537                 *last_len += len;
 538                 *defrag_end = extent_map_end(em);
 539         } else {
 540                 *last_len = 0;
 541                 *skip = extent_map_end(em);
 542                 *defrag_end = 0;
 543         }
 544
 545         free_extent_map(em);
 546         return ret;
 547 }
 548
 549 static int btrfs_defrag_file(struct file *file,
 550                              struct btrfs_ioctl_defrag_range_args *range)
 551 {
 552         struct inode *inode = fdentry(file)->d_inode;
 553         struct btrfs_root *root = BTRFS_I(inode)->root;
 554         struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
 555         struct btrfs_ordered_extent *ordered;
 556         struct page *page;
 557         unsigned long last_index;
 558         unsigned long ra_pages = root->fs_info->bdi.ra_pages;
 559         unsigned long total_read = 0;
 560         u64 page_start;
 561         u64 page_end;
 562         u64 last_len = 0;
 563         u64 skip = 0;
 564         u64 defrag_end = 0;
 565         unsigned long i;
 566         int ret;
 567
 568         if (inode->i_size == 0)
 569                 return 0;
 570
 571         if (range->start + range->len > range->start) {
 572                 last_index = min_t(u64, inode->i_size - 1,
 573                          range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
 574         } else {
 575                 last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT;
 576         }
 577
 578         i = range->start >> PAGE_CACHE_SHIFT;
 579         while (i <= last_index) {
 580                 if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
 581                                         PAGE_CACHE_SIZE,
 582                                         range->extent_thresh,
 583                                         &last_len, &skip,
 584                                         &defrag_end)) {
 585                         unsigned long next;
 586                         /*
 587                          * the should_defrag function tells us how much to skip
 588                          * bump our counter by the suggested amount
 589                          */
 590                         next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
 591                         i = max(i + 1, next);
 592                         continue;
 593                 }
 594
 595                 if (total_read % ra_pages == 0) {
 596                         btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i,
 597                                        min(last_index, i + ra_pages - 1));
 598                 }
 599                 total_read++;
 600                 mutex_lock(&inode->i_mutex);
 601                 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
 602                         BTRFS_I(inode)->force_compress = 1;
 603
 604                 ret = btrfs_check_data_free_space(root, inode, PAGE_CACHE_SIZE);
 605                 if (ret) {
 606                         ret = -ENOSPC;
 607                         break;
 608                 }
 609
 610                 ret = btrfs_reserve_metadata_for_delalloc(root, inode, 1);
 611                 if (ret) {
 612                         btrfs_free_reserved_data_space(root, inode,
 613                                                        PAGE_CACHE_SIZE);
 614                         ret = -ENOSPC;
 615                         break;
 616                 }
 617 again:
 618                 if (inode->i_size == 0 ||
 619                     i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) {
 620                         ret = 0;
 621                         goto err_reservations;
 622                 }
 623
 624                 page = grab_cache_page(inode->i_mapping, i);
 625                 if (!page)
 626                         goto err_reservations;
 627
 628                 if (!PageUptodate(page)) {
 629                         btrfs_readpage(NULL, page);
 630                         lock_page(page);
 631                         if (!PageUptodate(page)) {
 632                                 unlock_page(page);
 633                                 page_cache_release(page);
 634                                 goto err_reservations;
 635                         }
 636                 }
 637
 638                 if (page->mapping != inode->i_mapping) {
 639                         unlock_page(page);
 640                         page_cache_release(page);
 641                         goto again;
 642                 }
 643
 644                 wait_on_page_writeback(page);
 645
 646                 if (PageDirty(page)) {
 647                         btrfs_free_reserved_data_space(root, inode,
 648                                                        PAGE_CACHE_SIZE);
 649                         goto loop_unlock;
 650                 }
 651
 652                 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
 653                 page_end = page_start + PAGE_CACHE_SIZE - 1;
 654                 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
 655
 656                 ordered = btrfs_lookup_ordered_extent(inode, page_start);
 657                 if (ordered) {
 658                         unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
 659                         unlock_page(page);
 660                         page_cache_release(page);
 661                         btrfs_start_ordered_extent(inode, ordered, 1);
 662                         btrfs_put_ordered_extent(ordered);
 663                         goto again;
 664                 }
 665                 set_page_extent_mapped(page);
 666
 667                 /*
 668                  * this makes sure page_mkwrite is called on the
 669                  * page if it is dirtied again later
 670                  */
 671                 clear_page_dirty_for_io(page);
 672                 clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start,
 673                                   page_end, EXTENT_DIRTY | EXTENT_DELALLOC |
 674                                   EXTENT_DO_ACCOUNTING, GFP_NOFS);
 675
 676                 btrfs_set_extent_delalloc(inode, page_start, page_end, NULL);
 677                 ClearPageChecked(page);
 678                 set_page_dirty(page);
 679                 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
 680
 681 loop_unlock:
 682                 unlock_page(page);
 683                 page_cache_release(page);
 684                 mutex_unlock(&inode->i_mutex);
 685
 686                 btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
 687                 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
 688                 i++;
 689         }
 690
 691         if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO))
 692                 filemap_flush(inode->i_mapping);
 693
 694         if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
 695                 /* the filemap_flush will queue IO into the worker threads, but
 696                  * we have to make sure the IO is actually started and that
 697                  * ordered extents get created before we return
 698                  */
 699                 atomic_inc(&root->fs_info->async_submit_draining);
 700                 while (atomic_read(&root->fs_info->nr_async_submits) ||
 701                       atomic_read(&root->fs_info->async_delalloc_pages)) {
 702                         wait_event(root->fs_info->async_submit_wait,
 703                            (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
 704                             atomic_read(&root->fs_info->async_delalloc_pages) == 0));
 705                 }
 706                 atomic_dec(&root->fs_info->async_submit_draining);
 707
 708                 mutex_lock(&inode->i_mutex);
 709                 BTRFS_I(inode)->force_compress = 0;
 710                 mutex_unlock(&inode->i_mutex);
 711         }
 712
 713         return 0;
 714
 715 err_reservations:
 716         mutex_unlock(&inode->i_mutex);
 717         btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE);
 718         btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
 719         return ret;
 720 }
 721
 722 static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
 723                                         void __user *arg)
 724 {
 725         u64 new_size;
 726         u64 old_size;
 727         u64 devid = 1;
 728         struct btrfs_ioctl_vol_args *vol_args;
 729         struct btrfs_trans_handle *trans;
 730         struct btrfs_device *device = NULL;
 731         char *sizestr;
 732         char *devstr = NULL;
 733         int ret = 0;
 734         int namelen;
 735         int mod = 0;
 736
 737         if (root->fs_info->sb->s_flags & MS_RDONLY)
 738                 return -EROFS;
 739
 740         if (!capable(CAP_SYS_ADMIN))
 741                 return -EPERM;
 742
 743         vol_args = memdup_user(arg, sizeof(*vol_args));
 744         if (IS_ERR(vol_args))
 745                 return PTR_ERR(vol_args);
 746
 747         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
 748         namelen = strlen(vol_args->name);
 749
 750         mutex_lock(&root->fs_info->volume_mutex);
 751         sizestr = vol_args->name;
 752         devstr = strchr(sizestr, ':');
 753         if (devstr) {
 754                 char *end;
 755                 sizestr = devstr + 1;
 756                 *devstr = '\0';
 757                 devstr = vol_args->name;
 758                 devid = simple_strtoull(devstr, &end, 10);
 759                 printk(KERN_INFO "resizing devid %llu\n",
 760                        (unsigned long long)devid);
 761         }
 762         device = btrfs_find_device(root, devid, NULL, NULL);
 763         if (!device) {
 764                 printk(KERN_INFO "resizer unable to find device %llu\n",
 765                        (unsigned long long)devid);
 766                 ret = -EINVAL;
 767                 goto out_unlock;
 768         }
 769         if (!strcmp(sizestr, "max"))
 770                 new_size = device->bdev->bd_inode->i_size;
 771         else {
 772                 if (sizestr[0] == '-') {
 773                         mod = -1;
 774                         sizestr++;
 775                 } else if (sizestr[0] == '+') {
 776                         mod = 1;
 777                         sizestr++;
 778                 }
 779                 new_size = memparse(sizestr, NULL);
 780                 if (new_size == 0) {
 781                         ret = -EINVAL;
 782                         goto out_unlock;
 783                 }
 784         }
 785
 786         old_size = device->total_bytes;
 787
 788         if (mod < 0) {
 789                 if (new_size > old_size) {
 790                         ret = -EINVAL;
 791                         goto out_unlock;
 792                 }
 793                 new_size = old_size - new_size;
 794         } else if (mod > 0) {
 795                 new_size = old_size + new_size;
 796         }
 797
 798         if (new_size < 256 * 1024 * 1024) {
 799                 ret = -EINVAL;
 800                 goto out_unlock;
 801         }
 802         if (new_size > device->bdev->bd_inode->i_size) {
 803                 ret = -EFBIG;
 804                 goto out_unlock;
 805         }
 806
 807         do_div(new_size, root->sectorsize);
 808         new_size *= root->sectorsize;
 809
 810         printk(KERN_INFO "new size for %s is %llu\n",
 811                 device->name, (unsigned long long)new_size);
 812
 813         if (new_size > old_size) {
 814                 trans = btrfs_start_transaction(root, 1);
 815                 ret = btrfs_grow_device(trans, device, new_size);
 816                 btrfs_commit_transaction(trans, root);
 817         } else {
 818                 ret = btrfs_shrink_device(device, new_size);
 819         }
 820
 821 out_unlock:
 822         mutex_unlock(&root->fs_info->volume_mutex);
 823         kfree(vol_args);
 824         return ret;
 825 }
 826
 827 static noinline int btrfs_ioctl_snap_create(struct file *file,
 828                                             void __user *arg, int subvol)
 829 {
 830         struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
 831         struct btrfs_ioctl_vol_args *vol_args;
 832         struct file *src_file;
 833         int namelen;
 834         int ret = 0;
 835
 836         if (root->fs_info->sb->s_flags & MS_RDONLY)
 837                 return -EROFS;
 838
 839         vol_args = memdup_user(arg, sizeof(*vol_args));
 840         if (IS_ERR(vol_args))
 841                 return PTR_ERR(vol_args);
 842
 843         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
 844         namelen = strlen(vol_args->name);
 845         if (strchr(vol_args->name, '/')) {
 846                 ret = -EINVAL;
 847                 goto out;
 848         }
 849
 850         if (subvol) {
 851                 ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen,
 852                                      NULL);
 853         } else {
 854                 struct inode *src_inode;
 855                 src_file = fget(vol_args->fd);
 856                 if (!src_file) {
 857                         ret = -EINVAL;
 858                         goto out;
 859                 }
 860
 861                 src_inode = src_file->f_path.dentry->d_inode;
 862                 if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) {
 863                         printk(KERN_INFO "btrfs: Snapshot src from "
 864                                "another FS\n");
 865                         ret = -EINVAL;
 866                         fput(src_file);
 867                         goto out;
 868                 }
 869                 ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen,
 870                                      BTRFS_I(src_inode)->root);
 871                 fput(src_file);
 872         }
 873 out:
 874         kfree(vol_args);
 875         return ret;
 876 }
 877
 878 /*
 879  * helper to check if the subvolume references other subvolumes
 880  */
 881 static noinline int may_destroy_subvol(struct btrfs_root *root)
 882 {
 883         struct btrfs_path *path;
 884         struct btrfs_key key;
 885         int ret;
 886
 887         path = btrfs_alloc_path();
 888         if (!path)
 889                 return -ENOMEM;
 890
 891         key.objectid = root->root_key.objectid;
 892         key.type = BTRFS_ROOT_REF_KEY;
 893         key.offset = (u64)-1;
 894
 895         ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
 896                                 &key, path, 0, 0);
 897         if (ret < 0)
 898                 goto out;
 899         BUG_ON(ret == 0);
 900
 901         ret = 0;
 902         if (path->slots[0] > 0) {
 903                 path->slots[0]--;
 904                 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
 905                 if (key.objectid == root->root_key.objectid &&
 906                     key.type == BTRFS_ROOT_REF_KEY)
 907                         ret = -ENOTEMPTY;
 908         }
 909 out:
 910         btrfs_free_path(path);
 911         return ret;
 912 }
 913
 914 static noinline int key_in_sk(struct btrfs_key *key,
 915                               struct btrfs_ioctl_search_key *sk)
 916 {
 917         struct btrfs_key test;
 918         int ret;
 919
 920         test.objectid = sk->min_objectid;
 921         test.type = sk->min_type;
 922         test.offset = sk->min_offset;
 923
 924         ret = btrfs_comp_cpu_keys(key, &test);
 925         if (ret < 0)
 926                 return 0;
 927
 928         test.objectid = sk->max_objectid;
 929         test.type = sk->max_type;
 930         test.offset = sk->max_offset;
 931
 932         ret = btrfs_comp_cpu_keys(key, &test);
 933         if (ret > 0)
 934                 return 0;
 935         return 1;
 936 }
 937
 938 static noinline int copy_to_sk(struct btrfs_root *root,
 939                                struct btrfs_path *path,
 940                                struct btrfs_key *key,
 941                                struct btrfs_ioctl_search_key *sk,
 942                                char *buf,
 943                                unsigned long *sk_offset,
 944                                int *num_found)
 945 {
 946         u64 found_transid;
 947         struct extent_buffer *leaf;
 948         struct btrfs_ioctl_search_header sh;
 949         unsigned long item_off;
 950         unsigned long item_len;
 951         int nritems;
 952         int i;
 953         int slot;
 954         int found = 0;
 955         int ret = 0;
 956
 957         leaf = path->nodes[0];
 958         slot = path->slots[0];
 959         nritems = btrfs_header_nritems(leaf);
 960
 961         if (btrfs_header_generation(leaf) > sk->max_transid) {
 962                 i = nritems;
 963                 goto advance_key;
 964         }
 965         found_transid = btrfs_header_generation(leaf);
 966
 967         for (i = slot; i < nritems; i++) {
 968                 item_off = btrfs_item_ptr_offset(leaf, i);
 969                 item_len = btrfs_item_size_nr(leaf, i);
 970
 971                 if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
 972                         item_len = 0;
 973
 974                 if (sizeof(sh) + item_len + *sk_offset >
 975                     BTRFS_SEARCH_ARGS_BUFSIZE) {
 976                         ret = 1;
 977                         goto overflow;
 978                 }
 979
 980                 btrfs_item_key_to_cpu(leaf, key, i);
 981                 if (!key_in_sk(key, sk))
 982                         continue;
 983
 984                 sh.objectid = key->objectid;
 985                 sh.offset = key->offset;
 986                 sh.type = key->type;
 987                 sh.len = item_len;
 988                 sh.transid = found_transid;
 989
 990                 /* copy search result header */
 991                 memcpy(buf + *sk_offset, &sh, sizeof(sh));
 992                 *sk_offset += sizeof(sh);
 993
 994                 if (item_len) {
 995                         char *p = buf + *sk_offset;
 996                         /* copy the item */
 997                         read_extent_buffer(leaf, p,
 998                                            item_off, item_len);
 999                         *sk_offset += item_len;
1000                 }
1001                 found++;
1002
1003                 if (*num_found >= sk->nr_items)
1004                         break;
1005         }
1006 advance_key:
1007         ret = 0;
1008         if (key->offset < (u64)-1 && key->offset < sk->max_offset)
1009                 key->offset++;
1010         else if (key->type < (u8)-1 && key->type < sk->max_type) {
1011                 key->offset = 0;
1012                 key->type++;
1013         } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
1014                 key->offset = 0;
1015                 key->type = 0;
1016                 key->objectid++;
1017         } else
1018                 ret = 1;
1019 overflow:
1020         *num_found += found;
1021         return ret;
1022 }
1023
1024 static noinline int search_ioctl(struct inode *inode,
1025                                  struct btrfs_ioctl_search_args *args)
1026 {
1027         struct btrfs_root *root;
1028         struct btrfs_key key;
1029         struct btrfs_key max_key;
1030         struct btrfs_path *path;
1031         struct btrfs_ioctl_search_key *sk = &args->key;
1032         struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
1033         int ret;
1034         int num_found = 0;
1035         unsigned long sk_offset = 0;
1036
1037         path = btrfs_alloc_path();
1038         if (!path)
1039                 return -ENOMEM;
1040
1041         if (sk->tree_id == 0) {
1042                 /* search the root of the inode that was passed */
1043                 root = BTRFS_I(inode)->root;
1044         } else {
1045                 key.objectid = sk->tree_id;
1046                 key.type = BTRFS_ROOT_ITEM_KEY;
1047                 key.offset = (u64)-1;
1048                 root = btrfs_read_fs_root_no_name(info, &key);
1049                 if (IS_ERR(root)) {
1050                         printk(KERN_ERR "could not find root %llu\n",
1051                                sk->tree_id);
1052                         btrfs_free_path(path);
1053                         return -ENOENT;
1054                 }
1055         }
1056
1057         key.objectid = sk->min_objectid;
1058         key.type = sk->min_type;
1059         key.offset = sk->min_offset;
1060
1061         max_key.objectid = sk->max_objectid;
1062         max_key.type = sk->max_type;
1063         max_key.offset = sk->max_offset;
1064
1065         path->keep_locks = 1;
1066
1067         while(1) {
1068                 ret = btrfs_search_forward(root, &key, &max_key, path, 0,
1069                                            sk->min_transid);
1070                 if (ret != 0) {
1071                         if (ret > 0)
1072                                 ret = 0;
1073                         goto err;
1074                 }
1075                 ret = copy_to_sk(root, path, &key, sk, args->buf,
1076                                  &sk_offset, &num_found);
1077                 btrfs_release_path(root, path);
1078                 if (ret || num_found >= sk->nr_items)
1079                         break;
1080
1081         }
1082         ret = 0;
1083 err:
1084         sk->nr_items = num_found;
1085         btrfs_free_path(path);
1086         return ret;
1087 }
1088
1089 static noinline int btrfs_ioctl_tree_search(struct file *file,
1090                                            void __user *argp)
1091 {
1092          struct btrfs_ioctl_search_args *args;
1093          struct inode *inode;
1094          int ret;
1095
1096         if (!capable(CAP_SYS_ADMIN))
1097                 return -EPERM;
1098
1099         args = kmalloc(sizeof(*args), GFP_KERNEL);
1100         if (!args)
1101                 return -ENOMEM;
1102
1103         if (copy_from_user(args, argp, sizeof(*args))) {
1104                 kfree(args);
1105                 return -EFAULT;
1106         }
1107         inode = fdentry(file)->d_inode;
1108         ret = search_ioctl(inode, args);
1109         if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
1110                 ret = -EFAULT;
1111         kfree(args);
1112         return ret;
1113 }
1114
1115 /*
1116  * Search INODE_REFs to identify path name of 'dirid' directory
1117  * in a 'tree_id' tree. and sets path name to 'name'.
1118  */
1119 static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
1120                                 u64 tree_id, u64 dirid, char *name)
1121 {
1122         struct btrfs_root *root;
1123         struct btrfs_key key;
1124         char *ptr;
1125         int ret = -1;
1126         int slot;
1127         int len;
1128         int total_len = 0;
1129         struct btrfs_inode_ref *iref;
1130         struct extent_buffer *l;
1131         struct btrfs_path *path;
1132
1133         if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
1134                 name[0]='\0';
1135                 return 0;
1136         }
1137
1138         path = btrfs_alloc_path();
1139         if (!path)
1140                 return -ENOMEM;
1141
1142         ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
1143
1144         key.objectid = tree_id;
1145         key.type = BTRFS_ROOT_ITEM_KEY;
1146         key.offset = (u64)-1;
1147         root = btrfs_read_fs_root_no_name(info, &key);
1148         if (IS_ERR(root)) {
1149                 printk(KERN_ERR "could not find root %llu\n", tree_id);
1150                 ret = -ENOENT;
1151                 goto out;
1152         }
1153
1154         key.objectid = dirid;
1155         key.type = BTRFS_INODE_REF_KEY;
1156         key.offset = (u64)-1;
1157
1158         while(1) {
1159                 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1160                 if (ret < 0)
1161                         goto out;
1162
1163                 l = path->nodes[0];
1164                 slot = path->slots[0];
1165                 if (ret > 0 && slot > 0)
1166                         slot--;
1167                 btrfs_item_key_to_cpu(l, &key, slot);
1168
1169                 if (ret > 0 && (key.objectid != dirid ||
1170                                 key.type != BTRFS_INODE_REF_KEY)) {
1171                         ret = -ENOENT;
1172                         goto out;
1173                 }
1174
1175                 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
1176                 len = btrfs_inode_ref_name_len(l, iref);
1177                 ptr -= len + 1;
1178                 total_len += len + 1;
1179                 if (ptr < name)
1180                         goto out;
1181
1182                 *(ptr + len) = '/';
1183                 read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len);
1184
1185                 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
1186                         break;
1187
1188                 btrfs_release_path(root, path);
1189                 key.objectid = key.offset;
1190                 key.offset = (u64)-1;
1191                 dirid = key.objectid;
1192
1193         }
1194         if (ptr < name)
1195                 goto out;
1196         memcpy(name, ptr, total_len);
1197         name[total_len]='\0';
1198         ret = 0;
1199 out:
1200         btrfs_free_path(path);
1201         return ret;
1202 }
1203
1204 static noinline int btrfs_ioctl_ino_lookup(struct file *file,
1205                                            void __user *argp)
1206 {
1207          struct btrfs_ioctl_ino_lookup_args *args;
1208          struct inode *inode;
1209          int ret;
1210
1211         if (!capable(CAP_SYS_ADMIN))
1212                 return -EPERM;
1213
1214         args = kmalloc(sizeof(*args), GFP_KERNEL);
1215         if (!args)
1216                 return -ENOMEM;
1217
1218         if (copy_from_user(args, argp, sizeof(*args))) {
1219                 kfree(args);
1220                 return -EFAULT;
1221         }
1222         inode = fdentry(file)->d_inode;
1223
1224         if (args->treeid == 0)
1225                 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
1226
1227         ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
1228                                         args->treeid, args->objectid,
1229                                         args->name);
1230
1231         if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
1232                 ret = -EFAULT;
1233
1234         kfree(args);
1235         return ret;
1236 }
1237
1238 static noinline int btrfs_ioctl_snap_destroy(struct file *file,
1239                                              void __user *arg)
1240 {
1241         struct dentry *parent = fdentry(file);
1242         struct dentry *dentry;
1243         struct inode *dir = parent->d_inode;
1244         struct inode *inode;
1245         struct btrfs_root *root = BTRFS_I(dir)->root;
1246         struct btrfs_root *dest = NULL;
1247         struct btrfs_ioctl_vol_args *vol_args;
1248         struct btrfs_trans_handle *trans;
1249         int namelen;
1250         int ret;
1251         int err = 0;
1252
1253         if (!capable(CAP_SYS_ADMIN))
1254                 return -EPERM;
1255
1256         vol_args = memdup_user(arg, sizeof(*vol_args));
1257         if (IS_ERR(vol_args))
1258                 return PTR_ERR(vol_args);
1259
1260         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1261         namelen = strlen(vol_args->name);
1262         if (strchr(vol_args->name, '/') ||
1263             strncmp(vol_args->name, "..", namelen) == 0) {
1264                 err = -EINVAL;
1265                 goto out;
1266         }
1267
1268         err = mnt_want_write(file->f_path.mnt);
1269         if (err)
1270                 goto out;
1271
1272         mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
1273         dentry = lookup_one_len(vol_args->name, parent, namelen);
1274         if (IS_ERR(dentry)) {
1275                 err = PTR_ERR(dentry);
1276                 goto out_unlock_dir;
1277         }
1278
1279         if (!dentry->d_inode) {
1280                 err = -ENOENT;
1281                 goto out_dput;
1282         }
1283
1284         inode = dentry->d_inode;
1285         if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) {
1286                 err = -EINVAL;
1287                 goto out_dput;
1288         }
1289
1290         dest = BTRFS_I(inode)->root;
1291
1292         mutex_lock(&inode->i_mutex);
1293         err = d_invalidate(dentry);
1294         if (err)
1295                 goto out_unlock;
1296
1297         down_write(&root->fs_info->subvol_sem);
1298
1299         err = may_destroy_subvol(dest);
1300         if (err)
1301                 goto out_up_write;
1302
1303         trans = btrfs_start_transaction(root, 1);
1304         ret = btrfs_unlink_subvol(trans, root, dir,
1305                                 dest->root_key.objectid,
1306                                 dentry->d_name.name,
1307                                 dentry->d_name.len);
1308         BUG_ON(ret);
1309
1310         btrfs_record_root_in_trans(trans, dest);
1311
1312         memset(&dest->root_item.drop_progress, 0,
1313                 sizeof(dest->root_item.drop_progress));
1314         dest->root_item.drop_level = 0;
1315         btrfs_set_root_refs(&dest->root_item, 0);
1316
1317         ret = btrfs_insert_orphan_item(trans,
1318                                 root->fs_info->tree_root,
1319                                 dest->root_key.objectid);
1320         BUG_ON(ret);
1321
1322         ret = btrfs_commit_transaction(trans, root);
1323         BUG_ON(ret);
1324         inode->i_flags |= S_DEAD;
1325 out_up_write:
1326         up_write(&root->fs_info->subvol_sem);
1327 out_unlock:
1328         mutex_unlock(&inode->i_mutex);
1329         if (!err) {
1330                 shrink_dcache_sb(root->fs_info->sb);
1331                 btrfs_invalidate_inodes(dest);
1332                 d_delete(dentry);
1333         }
1334 out_dput:
1335         dput(dentry);
1336 out_unlock_dir:
1337         mutex_unlock(&dir->i_mutex);
1338         mnt_drop_write(file->f_path.mnt);
1339 out:
1340         kfree(vol_args);
1341         return err;
1342 }
1343
1344 static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
1345 {
1346         struct inode *inode = fdentry(file)->d_inode;
1347         struct btrfs_root *root = BTRFS_I(inode)->root;
1348         struct btrfs_ioctl_defrag_range_args *range;
1349         int ret;
1350
1351         ret = mnt_want_write(file->f_path.mnt);
1352         if (ret)
1353                 return ret;
1354
1355         switch (inode->i_mode & S_IFMT) {
1356         case S_IFDIR:
1357                 if (!capable(CAP_SYS_ADMIN)) {
1358                         ret = -EPERM;
1359                         goto out;
1360                 }
1361                 btrfs_defrag_root(root, 0);
1362                 btrfs_defrag_root(root->fs_info->extent_root, 0);
1363                 break;
1364         case S_IFREG:
1365                 if (!(file->f_mode & FMODE_WRITE)) {
1366                         ret = -EINVAL;
1367                         goto out;
1368                 }
1369
1370                 range = kzalloc(sizeof(*range), GFP_KERNEL);
1371                 if (!range) {
1372                         ret = -ENOMEM;
1373                         goto out;
1374                 }
1375
1376                 if (argp) {
1377                         if (copy_from_user(range, argp,
1378                                            sizeof(*range))) {
1379                                 ret = -EFAULT;
1380                                 kfree(range);
1381                                 goto out;
1382                         }
1383                         /* compression requires us to start the IO */
1384                         if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
1385                                 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
1386                                 range->extent_thresh = (u32)-1;
1387                         }
1388                 } else {
1389                         /* the rest are all set to zero by kzalloc */
1390                         range->len = (u64)-1;
1391                 }
1392                 btrfs_defrag_file(file, range);
1393                 kfree(range);
1394                 break;
1395         }
1396 out:
1397         mnt_drop_write(file->f_path.mnt);
1398         return ret;
1399 }
1400
1401 static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
1402 {
1403         struct btrfs_ioctl_vol_args *vol_args;
1404         int ret;
1405
1406         if (!capable(CAP_SYS_ADMIN))
1407                 return -EPERM;
1408
1409         vol_args = memdup_user(arg, sizeof(*vol_args));
1410         if (IS_ERR(vol_args))
1411                 return PTR_ERR(vol_args);
1412
1413         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1414         ret = btrfs_init_new_device(root, vol_args->name);
1415
1416         kfree(vol_args);
1417         return ret;
1418 }
1419
1420 static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
1421 {
1422         struct btrfs_ioctl_vol_args *vol_args;
1423         int ret;
1424
1425         if (!capable(CAP_SYS_ADMIN))
1426                 return -EPERM;
1427
1428         if (root->fs_info->sb->s_flags & MS_RDONLY)
1429                 return -EROFS;
1430
1431         vol_args = memdup_user(arg, sizeof(*vol_args));
1432         if (IS_ERR(vol_args))
1433                 return PTR_ERR(vol_args);
1434
1435         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1436         ret = btrfs_rm_device(root, vol_args->name);
1437
1438         kfree(vol_args);
1439         return ret;
1440 }
1441
1442 static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
1443                                        u64 off, u64 olen, u64 destoff)
1444 {
1445         struct inode *inode = fdentry(file)->d_inode;
1446         struct btrfs_root *root = BTRFS_I(inode)->root;
1447         struct file *src_file;
1448         struct inode *src;
1449         struct btrfs_trans_handle *trans;
1450         struct btrfs_path *path;
1451         struct extent_buffer *leaf;
1452         char *buf;
1453         struct btrfs_key key;
1454         u32 nritems;
1455         int slot;
1456         int ret;
1457         u64 len = olen;
1458         u64 bs = root->fs_info->sb->s_blocksize;
1459         u64 hint_byte;
1460
1461         /*
1462          * TODO:
1463          * - split compressed inline extents.  annoying: we need to
1464          *   decompress into destination's address_space (the file offset
1465          *   may change, so source mapping won't do), then recompress (or
1466          *   otherwise reinsert) a subrange.
1467          * - allow ranges within the same file to be cloned (provided
1468          *   they don't overlap)?
1469          */
1470
1471         /* the destination must be opened for writing */
1472         if (!(file->f_mode & FMODE_WRITE))
1473                 return -EINVAL;
1474
1475         ret = mnt_want_write(file->f_path.mnt);
1476         if (ret)
1477                 return ret;
1478
1479         src_file = fget(srcfd);
1480         if (!src_file) {
1481                 ret = -EBADF;
1482                 goto out_drop_write;
1483         }
1484
1485         src = src_file->f_dentry->d_inode;
1486
1487         ret = -EINVAL;
1488         if (src == inode)
1489                 goto out_fput;
1490
1491         /* the src must be open for reading */
1492         if (!(src_file->f_mode & FMODE_READ))
1493                 goto out_fput;
1494
1495         ret = -EISDIR;
1496         if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
1497                 goto out_fput;
1498
1499         ret = -EXDEV;
1500         if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root)
1501                 goto out_fput;
1502
1503         ret = -ENOMEM;
1504         buf = vmalloc(btrfs_level_size(root, 0));
1505         if (!buf)
1506                 goto out_fput;
1507
1508         path = btrfs_alloc_path();
1509         if (!path) {
1510                 vfree(buf);
1511                 goto out_fput;
1512         }
1513         path->reada = 2;
1514
1515         if (inode < src) {
1516                 mutex_lock(&inode->i_mutex);
1517                 mutex_lock(&src->i_mutex);
1518         } else {
1519                 mutex_lock(&src->i_mutex);
1520                 mutex_lock(&inode->i_mutex);
1521         }
1522
1523         /* determine range to clone */
1524         ret = -EINVAL;
1525         if (off >= src->i_size || off + len > src->i_size)
1526                 goto out_unlock;
1527         if (len == 0)
1528                 olen = len = src->i_size - off;
1529         /* if we extend to eof, continue to block boundary */
1530         if (off + len == src->i_size)
1531                 len = ((src->i_size + bs-1) & ~(bs-1))
1532                         - off;
1533
1534         /* verify the end result is block aligned */
1535         if ((off & (bs-1)) ||
1536             ((off + len) & (bs-1)))
1537                 goto out_unlock;
1538
1539         /* do any pending delalloc/csum calc on src, one way or
1540            another, and lock file content */
1541         while (1) {
1542                 struct btrfs_ordered_extent *ordered;
1543                 lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
1544                 ordered = btrfs_lookup_first_ordered_extent(inode, off+len);
1545                 if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered)
1546                         break;
1547                 unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
1548                 if (ordered)
1549                         btrfs_put_ordered_extent(ordered);
1550                 btrfs_wait_ordered_range(src, off, off+len);
1551         }
1552
1553         trans = btrfs_start_transaction(root, 1);
1554         BUG_ON(!trans);
1555
1556         /* punch hole in destination first */
1557         btrfs_drop_extents(trans, inode, off, off + len, &hint_byte, 1);
1558
1559         /* clone data */
1560         key.objectid = src->i_ino;
1561         key.type = BTRFS_EXTENT_DATA_KEY;
1562         key.offset = 0;
1563
1564         while (1) {
1565                 /*
1566                  * note the key will change type as we walk through the
1567                  * tree.
1568                  */
1569                 ret = btrfs_search_slot(trans, root, &key, path, 0, 0);
1570                 if (ret < 0)
1571                         goto out;
1572
1573                 nritems = btrfs_header_nritems(path->nodes[0]);
1574                 if (path->slots[0] >= nritems) {
1575                         ret = btrfs_next_leaf(root, path);
1576                         if (ret < 0)
1577                                 goto out;
1578                         if (ret > 0)
1579                                 break;
1580                         nritems = btrfs_header_nritems(path->nodes[0]);
1581                 }
1582                 leaf = path->nodes[0];
1583                 slot = path->slots[0];
1584
1585                 btrfs_item_key_to_cpu(leaf, &key, slot);
1586                 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
1587                     key.objectid != src->i_ino)
1588                         break;
1589
1590                 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
1591                         struct btrfs_file_extent_item *extent;
1592                         int type;
1593                         u32 size;
1594                         struct btrfs_key new_key;
1595                         u64 disko = 0, diskl = 0;
1596                         u64 datao = 0, datal = 0;
1597                         u8 comp;
1598
1599                         size = btrfs_item_size_nr(leaf, slot);
1600                         read_extent_buffer(leaf, buf,
1601                                            btrfs_item_ptr_offset(leaf, slot),
1602                                            size);
1603
1604                         extent = btrfs_item_ptr(leaf, slot,
1605                                                 struct btrfs_file_extent_item);
1606                         comp = btrfs_file_extent_compression(leaf, extent);
1607                         type = btrfs_file_extent_type(leaf, extent);
1608                         if (type == BTRFS_FILE_EXTENT_REG ||
1609                             type == BTRFS_FILE_EXTENT_PREALLOC) {
1610                                 disko = btrfs_file_extent_disk_bytenr(leaf,
1611                                                                       extent);
1612                                 diskl = btrfs_file_extent_disk_num_bytes(leaf,
1613                                                                  extent);
1614                                 datao = btrfs_file_extent_offset(leaf, extent);
1615                                 datal = btrfs_file_extent_num_bytes(leaf,
1616                                                                     extent);
1617                         } else if (type == BTRFS_FILE_EXTENT_INLINE) {
1618                                 /* take upper bound, may be compressed */
1619                                 datal = btrfs_file_extent_ram_bytes(leaf,
1620                                                                     extent);
1621                         }
1622                         btrfs_release_path(root, path);
1623
1624                         if (key.offset + datal < off ||
1625                             key.offset >= off+len)
1626                                 goto next;
1627
1628                         memcpy(&new_key, &key, sizeof(new_key));
1629                         new_key.objectid = inode->i_ino;
1630                         new_key.offset = key.offset + destoff - off;
1631
1632                         if (type == BTRFS_FILE_EXTENT_REG ||
1633                             type == BTRFS_FILE_EXTENT_PREALLOC) {
1634                                 ret = btrfs_insert_empty_item(trans, root, path,
1635                                                               &new_key, size);
1636                                 if (ret)
1637                                         goto out;
1638
1639                                 leaf = path->nodes[0];
1640                                 slot = path->slots[0];
1641                                 write_extent_buffer(leaf, buf,
1642                                             btrfs_item_ptr_offset(leaf, slot),
1643                                             size);
1644
1645                                 extent = btrfs_item_ptr(leaf, slot,
1646                                                 struct btrfs_file_extent_item);
1647
1648                                 if (off > key.offset) {
1649                                         datao += off - key.offset;
1650                                         datal -= off - key.offset;
1651                                 }
1652
1653                                 if (key.offset + datal > off + len)
1654                                         datal = off + len - key.offset;
1655
1656                                 /* disko == 0 means it's a hole */
1657                                 if (!disko)
1658                                         datao = 0;
1659
1660                                 btrfs_set_file_extent_offset(leaf, extent,
1661                                                              datao);
1662                                 btrfs_set_file_extent_num_bytes(leaf, extent,
1663                                                                 datal);
1664                                 if (disko) {
1665                                         inode_add_bytes(inode, datal);
1666                                         ret = btrfs_inc_extent_ref(trans, root,
1667                                                         disko, diskl, 0,
1668                                                         root->root_key.objectid,
1669                                                         inode->i_ino,
1670                                                         new_key.offset - datao);
1671                                         BUG_ON(ret);
1672                                 }
1673                         } else if (type == BTRFS_FILE_EXTENT_INLINE) {
1674                                 u64 skip = 0;
1675                                 u64 trim = 0;
1676                                 if (off > key.offset) {
1677                                         skip = off - key.offset;
1678                                         new_key.offset += skip;
1679                                 }
1680
1681                                 if (key.offset + datal > off+len)
1682                                         trim = key.offset + datal - (off+len);
1683
1684                                 if (comp && (skip || trim)) {
1685                                         ret = -EINVAL;
1686                                         goto out;
1687                                 }
1688                                 size -= skip + trim;
1689                                 datal -= skip + trim;
1690                                 ret = btrfs_insert_empty_item(trans, root, path,
1691                                                               &new_key, size);
1692                                 if (ret)
1693                                         goto out;
1694
1695                                 if (skip) {
1696                                         u32 start =
1697                                           btrfs_file_extent_calc_inline_size(0);
1698                                         memmove(buf+start, buf+start+skip,
1699                                                 datal);
1700                                 }
1701
1702                                 leaf = path->nodes[0];
1703                                 slot = path->slots[0];
1704                                 write_extent_buffer(leaf, buf,
1705                                             btrfs_item_ptr_offset(leaf, slot),
1706                                             size);
1707                                 inode_add_bytes(inode, datal);
1708                         }
1709
1710                         btrfs_mark_buffer_dirty(leaf);
1711                 }
1712
1713 next:
1714                 btrfs_release_path(root, path);
1715                 key.offset++;
1716         }
1717         ret = 0;
1718 out:
1719         btrfs_release_path(root, path);
1720         if (ret == 0) {
1721                 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1722                 if (destoff + olen > inode->i_size)
1723                         btrfs_i_size_write(inode, destoff + olen);
1724                 BTRFS_I(inode)->flags = BTRFS_I(src)->flags;
1725                 ret = btrfs_update_inode(trans, root, inode);
1726         }
1727         btrfs_end_transaction(trans, root);
1728         unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
1729         if (ret)
1730                 vmtruncate(inode, 0);
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 }