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Btrfs: Copy correct tree when inserting into slot 0
[net-next-2.6.git] / fs / btrfs / inode.c
CommitLineData
6cbd5570
CM		 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
39279cc3
CM		 19#include <linux/buffer_head.h>
20#include <linux/fs.h>
21#include <linux/pagemap.h>
22#include <linux/highmem.h>
23#include <linux/time.h>
24#include <linux/init.h>
25#include <linux/string.h>
26#include <linux/smp_lock.h>
27#include <linux/backing-dev.h>
28#include <linux/mpage.h>
29#include <linux/swap.h>
30#include <linux/writeback.h>
31#include <linux/statfs.h>
32#include <linux/compat.h>
9ebefb18 33#include <linux/bit_spinlock.h>
92fee66d 34#include <linux/version.h>
5103e947 35#include <linux/xattr.h>
39279cc3
CM		 36#include "ctree.h"
37#include "disk-io.h"
38#include "transaction.h"
39#include "btrfs_inode.h"
40#include "ioctl.h"
41#include "print-tree.h"
42
43struct btrfs_iget_args {
44 u64 ino;
45 struct btrfs_root *root;
46};
47
48static struct inode_operations btrfs_dir_inode_operations;
49static struct inode_operations btrfs_symlink_inode_operations;
50static struct inode_operations btrfs_dir_ro_inode_operations;
618e21d5 51static struct inode_operations btrfs_special_inode_operations;
39279cc3
CM		 52static struct inode_operations btrfs_file_inode_operations;
53static struct address_space_operations btrfs_aops;
54static struct address_space_operations btrfs_symlink_aops;
55static struct file_operations btrfs_dir_file_operations;
d1310b2e 56static struct extent_io_ops btrfs_extent_io_ops;
39279cc3
CM		 57
58static struct kmem_cache *btrfs_inode_cachep;
59struct kmem_cache *btrfs_trans_handle_cachep;
60struct kmem_cache *btrfs_transaction_cachep;
61struct kmem_cache *btrfs_bit_radix_cachep;
62struct kmem_cache *btrfs_path_cachep;
63
64#define S_SHIFT 12
65static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
66 [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
67 [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
68 [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
69 [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
70 [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
71 [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
72 [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
73};
74
1832a6d5
CM		 75int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
76 int for_del)
77{
78 u64 total = btrfs_super_total_bytes(&root->fs_info->super_copy);
79 u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy);
80 u64 thresh;
81 int ret = 0;
82
83 if (for_del)
f9ef6604 84 thresh = total * 90;
1832a6d5 85 else
f9ef6604
CM		 86 thresh = total * 85;
87
88 do_div(thresh, 100);
1832a6d5
CM		 89
90 spin_lock(&root->fs_info->delalloc_lock);
91 if (used + root->fs_info->delalloc_bytes + num_required > thresh)
92 ret = -ENOSPC;
93 spin_unlock(&root->fs_info->delalloc_lock);
94 return ret;
95}
96
be20aa9d 97static int cow_file_range(struct inode *inode, u64 start, u64 end)
b888db2b
CM		 98{
99 struct btrfs_root *root = BTRFS_I(inode)->root;
100 struct btrfs_trans_handle *trans;
b888db2b 101 u64 alloc_hint = 0;
db94535d 102 u64 num_bytes;
c59f8951 103 u64 cur_alloc_size;
db94535d 104 u64 blocksize = root->sectorsize;
d1310b2e
CM		 105 u64 orig_start = start;
106 u64 orig_num_bytes;
be20aa9d
CM		 107 struct btrfs_key ins;
108 int ret;
b888db2b 109
b888db2b 110 trans = btrfs_start_transaction(root, 1);
b888db2b 111 BUG_ON(!trans);
be20aa9d
CM		 112 btrfs_set_trans_block_group(trans, inode);
113
db94535d 114 num_bytes = (end - start + blocksize) & ~(blocksize - 1);
be20aa9d 115 num_bytes = max(blocksize, num_bytes);
b888db2b 116 ret = btrfs_drop_extents(trans, root, inode,
3326d1b0 117 start, start + num_bytes, start, &alloc_hint);
d1310b2e 118 orig_num_bytes = num_bytes;
db94535d 119
179e29e4
CM		 120 if (alloc_hint == EXTENT_MAP_INLINE)
121 goto out;
122
c59f8951
CM		 123 while(num_bytes > 0) {
124 cur_alloc_size = min(num_bytes, root->fs_info->max_extent);
125 ret = btrfs_alloc_extent(trans, root, cur_alloc_size,
126 root->root_key.objectid,
127 trans->transid,
128 inode->i_ino, start, 0,
129 alloc_hint, (u64)-1, &ins, 1);
130 if (ret) {
131 WARN_ON(1);
132 goto out;
133 }
134 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
135 start, ins.objectid, ins.offset,
136 ins.offset);
5f56406a 137 btrfs_check_file(root, inode);
c59f8951
CM		 138 num_bytes -= cur_alloc_size;
139 alloc_hint = ins.objectid + ins.offset;
140 start += cur_alloc_size;
b888db2b 141 }
d1310b2e
CM		 142 btrfs_drop_extent_cache(inode, orig_start,
143 orig_start + orig_num_bytes - 1);
dc17ff8f 144 btrfs_add_ordered_inode(inode);
b888db2b
CM		 145out:
146 btrfs_end_transaction(trans, root);
be20aa9d
CM		 147 return ret;
148}
149
150static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end)
151{
152 u64 extent_start;
153 u64 extent_end;
154 u64 bytenr;
155 u64 cow_end;
1832a6d5 156 u64 loops = 0;
c31f8830 157 u64 total_fs_bytes;
be20aa9d
CM		 158 struct btrfs_root *root = BTRFS_I(inode)->root;
159 struct extent_buffer *leaf;
160 int found_type;
161 struct btrfs_path *path;
162 struct btrfs_file_extent_item *item;
163 int ret;
164 int err;
165 struct btrfs_key found_key;
166
c31f8830 167 total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
be20aa9d
CM		 168 path = btrfs_alloc_path();
169 BUG_ON(!path);
170again:
171 ret = btrfs_lookup_file_extent(NULL, root, path,
172 inode->i_ino, start, 0);
173 if (ret < 0) {
174 btrfs_free_path(path);
175 return ret;
176 }
177
178 cow_end = end;
179 if (ret != 0) {
180 if (path->slots[0] == 0)
181 goto not_found;
182 path->slots[0]--;
183 }
184
185 leaf = path->nodes[0];
186 item = btrfs_item_ptr(leaf, path->slots[0],
187 struct btrfs_file_extent_item);
188
189 /* are we inside the extent that was found? */
190 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
191 found_type = btrfs_key_type(&found_key);
192 if (found_key.objectid != inode->i_ino ||
193 found_type != BTRFS_EXTENT_DATA_KEY) {
194 goto not_found;
195 }
196
197 found_type = btrfs_file_extent_type(leaf, item);
198 extent_start = found_key.offset;
199 if (found_type == BTRFS_FILE_EXTENT_REG) {
c31f8830
CM		 200 u64 extent_num_bytes;
201
202 extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item);
203 extent_end = extent_start + extent_num_bytes;
be20aa9d
CM		 204 err = 0;
205
1832a6d5
CM		 206 if (loops && start != extent_start)
207 goto not_found;
208
be20aa9d
CM		 209 if (start < extent_start || start >= extent_end)
210 goto not_found;
211
212 cow_end = min(end, extent_end - 1);
213 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
214 if (bytenr == 0)
215 goto not_found;
216
c31f8830
CM		 217 /*
218 * we may be called by the resizer, make sure we're inside
219 * the limits of the FS
220 */
221 if (bytenr + extent_num_bytes > total_fs_bytes)
222 goto not_found;
223
be20aa9d
CM		 224 if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) {
225 goto not_found;
226 }
227
228 start = extent_end;
bd09835d 229 } else {
be20aa9d
CM		 230 goto not_found;
231 }
232loop:
233 if (start > end) {
234 btrfs_free_path(path);
235 return 0;
236 }
237 btrfs_release_path(root, path);
1832a6d5 238 loops++;
be20aa9d
CM		 239 goto again;
240
241not_found:
242 cow_file_range(inode, start, cow_end);
243 start = cow_end + 1;
244 goto loop;
245}
246
247static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
248{
249 struct btrfs_root *root = BTRFS_I(inode)->root;
250 int ret;
be20aa9d 251 mutex_lock(&root->fs_info->fs_mutex);
b98b6767
Y		 252 if (btrfs_test_opt(root, NODATACOW) ||
253 btrfs_test_flag(inode, NODATACOW))
be20aa9d
CM		 254 ret = run_delalloc_nocow(inode, start, end);
255 else
256 ret = cow_file_range(inode, start, end);
1832a6d5 257
b888db2b
CM		 258 mutex_unlock(&root->fs_info->fs_mutex);
259 return ret;
260}
261
291d673e
CM		 262int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
263 unsigned long bits)
264{
265 if ((bits & EXTENT_DELALLOC)) {
266 struct btrfs_root *root = BTRFS_I(inode)->root;
267 spin_lock(&root->fs_info->delalloc_lock);
268 root->fs_info->delalloc_bytes += end - start + 1;
269 spin_unlock(&root->fs_info->delalloc_lock);
270 }
271 return 0;
272}
273
274int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end,
275 unsigned long bits)
276{
277 if ((bits & EXTENT_DELALLOC)) {
278 struct btrfs_root *root = BTRFS_I(inode)->root;
279 spin_lock(&root->fs_info->delalloc_lock);
280 root->fs_info->delalloc_bytes -= end - start + 1;
281 spin_unlock(&root->fs_info->delalloc_lock);
282 }
283 return 0;
284}
285
07157aac
CM		 286int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end)
287{
288 struct inode *inode = page->mapping->host;
289 struct btrfs_root *root = BTRFS_I(inode)->root;
290 struct btrfs_trans_handle *trans;
291 char *kaddr;
b6cda9bc 292 int ret = 0;
35ebb934 293 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
07157aac 294 size_t offset = start - page_start;
b98b6767
Y		 295 if (btrfs_test_opt(root, NODATASUM) ||
296 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 297 return 0;
07157aac
CM		 298 mutex_lock(&root->fs_info->fs_mutex);
299 trans = btrfs_start_transaction(root, 1);
300 btrfs_set_trans_block_group(trans, inode);
301 kaddr = kmap(page);
f578d4bd 302 btrfs_csum_file_block(trans, root, inode, inode->i_ino,
07157aac
CM		 303 start, kaddr + offset, end - start + 1);
304 kunmap(page);
305 ret = btrfs_end_transaction(trans, root);
306 BUG_ON(ret);
307 mutex_unlock(&root->fs_info->fs_mutex);
308 return ret;
309}
310
311int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
312{
313 int ret = 0;
314 struct inode *inode = page->mapping->host;
315 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 316 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
07157aac
CM		 317 struct btrfs_csum_item *item;
318 struct btrfs_path *path = NULL;
ff79f819 319 u32 csum;
b98b6767
Y		 320 if (btrfs_test_opt(root, NODATASUM) ||
321 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 322 return 0;
07157aac
CM		 323 mutex_lock(&root->fs_info->fs_mutex);
324 path = btrfs_alloc_path();
325 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
326 if (IS_ERR(item)) {
327 ret = PTR_ERR(item);
328 /* a csum that isn't present is a preallocated region. */
329 if (ret == -ENOENT || ret == -EFBIG)
330 ret = 0;
ff79f819 331 csum = 0;
aadfeb6e 332 printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start);
07157aac
CM		 333 goto out;
334 }
ff79f819
CM		 335 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
336 BTRFS_CRC32_SIZE);
d1310b2e 337 set_state_private(io_tree, start, csum);
07157aac
CM		 338out:
339 if (path)
340 btrfs_free_path(path);
341 mutex_unlock(&root->fs_info->fs_mutex);
342 return ret;
343}
344
70dec807
CM		 345int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end,
346 struct extent_state *state)
07157aac 347{
35ebb934 348 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
07157aac 349 struct inode *inode = page->mapping->host;
d1310b2e 350 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
07157aac 351 char *kaddr;
aadfeb6e 352 u64 private = ~(u32)0;
07157aac 353 int ret;
ff79f819
CM		 354 struct btrfs_root *root = BTRFS_I(inode)->root;
355 u32 csum = ~(u32)0;
bbf0d006 356 unsigned long flags;
d1310b2e 357
b98b6767
Y		 358 if (btrfs_test_opt(root, NODATASUM) ||
359 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 360 return 0;
d1310b2e 361
70dec807
CM		 362 if (state->start == start) {
363 private = state->private;
364 ret = 0;
365 } else {
366 ret = get_state_private(io_tree, start, &private);
367 }
bbf0d006 368 local_irq_save(flags);
07157aac
CM		 369 kaddr = kmap_atomic(page, KM_IRQ0);
370 if (ret) {
371 goto zeroit;
372 }
ff79f819
CM		 373 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
374 btrfs_csum_final(csum, (char *)&csum);
375 if (csum != private) {
07157aac
CM		 376 goto zeroit;
377 }
378 kunmap_atomic(kaddr, KM_IRQ0);
bbf0d006 379 local_irq_restore(flags);
07157aac
CM		 380 return 0;
381
382zeroit:
aadfeb6e
CM		 383 printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n",
384 page->mapping->host->i_ino, (unsigned long long)start, csum,
385 private);
db94535d
CM		 386 memset(kaddr + offset, 1, end - start + 1);
387 flush_dcache_page(page);
07157aac 388 kunmap_atomic(kaddr, KM_IRQ0);
bbf0d006 389 local_irq_restore(flags);
07157aac
CM		 390 return 0;
391}
b888db2b 392
39279cc3
CM		 393void btrfs_read_locked_inode(struct inode *inode)
394{
395 struct btrfs_path *path;
5f39d397 396 struct extent_buffer *leaf;
39279cc3 397 struct btrfs_inode_item *inode_item;
5f39d397 398 struct btrfs_inode_timespec *tspec;
39279cc3
CM		 399 struct btrfs_root *root = BTRFS_I(inode)->root;
400 struct btrfs_key location;
401 u64 alloc_group_block;
618e21d5 402 u32 rdev;
39279cc3
CM		 403 int ret;
404
405 path = btrfs_alloc_path();
406 BUG_ON(!path);
39279cc3 407 mutex_lock(&root->fs_info->fs_mutex);
39279cc3 408 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
dc17ff8f 409
39279cc3 410 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
5f39d397 411 if (ret)
39279cc3 412 goto make_bad;
39279cc3 413
5f39d397
CM		 414 leaf = path->nodes[0];
415 inode_item = btrfs_item_ptr(leaf, path->slots[0],
416 struct btrfs_inode_item);
417
418 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
419 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
420 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
421 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
422 inode->i_size = btrfs_inode_size(leaf, inode_item);
423
424 tspec = btrfs_inode_atime(inode_item);
425 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
426 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
427
428 tspec = btrfs_inode_mtime(inode_item);
429 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
430 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
431
432 tspec = btrfs_inode_ctime(inode_item);
433 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
434 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
435
436 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
437 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
618e21d5 438 inode->i_rdev = 0;
5f39d397
CM		 439 rdev = btrfs_inode_rdev(leaf, inode_item);
440
441 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
39279cc3
CM		 442 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
443 alloc_group_block);
b98b6767 444 BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
e52ec0eb
CM		 445 if (!BTRFS_I(inode)->block_group) {
446 BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
447 NULL, 0, 0, 0);
448 }
39279cc3
CM		 449 btrfs_free_path(path);
450 inode_item = NULL;
451
452 mutex_unlock(&root->fs_info->fs_mutex);
453
454 switch (inode->i_mode & S_IFMT) {
39279cc3
CM		 455 case S_IFREG:
456 inode->i_mapping->a_ops = &btrfs_aops;
d1310b2e 457 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 458 inode->i_fop = &btrfs_file_operations;
459 inode->i_op = &btrfs_file_inode_operations;
460 break;
461 case S_IFDIR:
462 inode->i_fop = &btrfs_dir_file_operations;
463 if (root == root->fs_info->tree_root)
464 inode->i_op = &btrfs_dir_ro_inode_operations;
465 else
466 inode->i_op = &btrfs_dir_inode_operations;
467 break;
468 case S_IFLNK:
469 inode->i_op = &btrfs_symlink_inode_operations;
470 inode->i_mapping->a_ops = &btrfs_symlink_aops;
471 break;
618e21d5
JB		 472 default:
473 init_special_inode(inode, inode->i_mode, rdev);
474 break;
39279cc3
CM		 475 }
476 return;
477
478make_bad:
479 btrfs_release_path(root, path);
480 btrfs_free_path(path);
481 mutex_unlock(&root->fs_info->fs_mutex);
482 make_bad_inode(inode);
483}
484
5f39d397
CM		 485static void fill_inode_item(struct extent_buffer *leaf,
486 struct btrfs_inode_item *item,
39279cc3
CM		 487 struct inode *inode)
488{
5f39d397
CM		 489 btrfs_set_inode_uid(leaf, item, inode->i_uid);
490 btrfs_set_inode_gid(leaf, item, inode->i_gid);
491 btrfs_set_inode_size(leaf, item, inode->i_size);
492 btrfs_set_inode_mode(leaf, item, inode->i_mode);
493 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
494
495 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
496 inode->i_atime.tv_sec);
497 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
498 inode->i_atime.tv_nsec);
499
500 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
501 inode->i_mtime.tv_sec);
502 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
503 inode->i_mtime.tv_nsec);
504
505 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
506 inode->i_ctime.tv_sec);
507 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
508 inode->i_ctime.tv_nsec);
509
510 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
511 btrfs_set_inode_generation(leaf, item, inode->i_generation);
512 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
b98b6767 513 btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
5f39d397 514 btrfs_set_inode_block_group(leaf, item,
39279cc3
CM		 515 BTRFS_I(inode)->block_group->key.objectid);
516}
517
a52d9a80 518int btrfs_update_inode(struct btrfs_trans_handle *trans,
39279cc3
CM		 519 struct btrfs_root *root,
520 struct inode *inode)
521{
522 struct btrfs_inode_item *inode_item;
523 struct btrfs_path *path;
5f39d397 524 struct extent_buffer *leaf;
39279cc3
CM		 525 int ret;
526
527 path = btrfs_alloc_path();
528 BUG_ON(!path);
39279cc3
CM		 529 ret = btrfs_lookup_inode(trans, root, path,
530 &BTRFS_I(inode)->location, 1);
531 if (ret) {
532 if (ret > 0)
533 ret = -ENOENT;
534 goto failed;
535 }
536
5f39d397
CM		 537 leaf = path->nodes[0];
538 inode_item = btrfs_item_ptr(leaf, path->slots[0],
39279cc3
CM		 539 struct btrfs_inode_item);
540
5f39d397
CM		 541 fill_inode_item(leaf, inode_item, inode);
542 btrfs_mark_buffer_dirty(leaf);
15ee9bc7 543 btrfs_set_inode_last_trans(trans, inode);
39279cc3
CM		 544 ret = 0;
545failed:
546 btrfs_release_path(root, path);
547 btrfs_free_path(path);
548 return ret;
549}
550
551
552static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
553 struct btrfs_root *root,
554 struct inode *dir,
555 struct dentry *dentry)
556{
557 struct btrfs_path *path;
558 const char *name = dentry->d_name.name;
559 int name_len = dentry->d_name.len;
560 int ret = 0;
5f39d397 561 struct extent_buffer *leaf;
39279cc3 562 struct btrfs_dir_item *di;
5f39d397 563 struct btrfs_key key;
39279cc3
CM		 564
565 path = btrfs_alloc_path();
54aa1f4d
CM		 566 if (!path) {
567 ret = -ENOMEM;
568 goto err;
569 }
570
39279cc3
CM		 571 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
572 name, name_len, -1);
573 if (IS_ERR(di)) {
574 ret = PTR_ERR(di);
575 goto err;
576 }
577 if (!di) {
578 ret = -ENOENT;
579 goto err;
580 }
5f39d397
CM		 581 leaf = path->nodes[0];
582 btrfs_dir_item_key_to_cpu(leaf, di, &key);
39279cc3 583 ret = btrfs_delete_one_dir_name(trans, root, path, di);
54aa1f4d
CM		 584 if (ret)
585 goto err;
39279cc3
CM		 586 btrfs_release_path(root, path);
587
588 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
5f39d397 589 key.objectid, name, name_len, -1);
39279cc3
CM		 590 if (IS_ERR(di)) {
591 ret = PTR_ERR(di);
592 goto err;
593 }
594 if (!di) {
595 ret = -ENOENT;
596 goto err;
597 }
598 ret = btrfs_delete_one_dir_name(trans, root, path, di);
39279cc3
CM		 599
600 dentry->d_inode->i_ctime = dir->i_ctime;
76fea00a
CM		 601 ret = btrfs_del_inode_ref(trans, root, name, name_len,
602 dentry->d_inode->i_ino,
603 dentry->d_parent->d_inode->i_ino);
604 if (ret) {
605 printk("failed to delete reference to %.*s, "
606 "inode %lu parent %lu\n", name_len, name,
607 dentry->d_inode->i_ino,
608 dentry->d_parent->d_inode->i_ino);
3954401f 609 }
39279cc3
CM		 610err:
611 btrfs_free_path(path);
612 if (!ret) {
613 dir->i_size -= name_len * 2;
79c44584 614 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
39279cc3 615 btrfs_update_inode(trans, root, dir);
6da6abae
CM		 616#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
617 dentry->d_inode->i_nlink--;
618#else
39279cc3 619 drop_nlink(dentry->d_inode);
6da6abae 620#endif
54aa1f4d 621 ret = btrfs_update_inode(trans, root, dentry->d_inode);
39279cc3
CM		 622 dir->i_sb->s_dirt = 1;
623 }
624 return ret;
625}
626
627static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
628{
629 struct btrfs_root *root;
630 struct btrfs_trans_handle *trans;
2da98f00 631 struct inode *inode = dentry->d_inode;
39279cc3 632 int ret;
1832a6d5 633 unsigned long nr = 0;
39279cc3
CM		 634
635 root = BTRFS_I(dir)->root;
636 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 637
638 ret = btrfs_check_free_space(root, 1, 1);
639 if (ret)
640 goto fail;
641
39279cc3 642 trans = btrfs_start_transaction(root, 1);
5f39d397 643
39279cc3
CM		 644 btrfs_set_trans_block_group(trans, dir);
645 ret = btrfs_unlink_trans(trans, root, dir, dentry);
d3c2fdcf 646 nr = trans->blocks_used;
5f39d397 647
2da98f00
CM		 648 if (inode->i_nlink == 0) {
649 int found;
650 /* if the inode isn't linked anywhere,
651 * we don't need to worry about
652 * data=ordered
653 */
654 found = btrfs_del_ordered_inode(inode);
655 if (found == 1) {
656 atomic_dec(&inode->i_count);
657 }
658 }
659
39279cc3 660 btrfs_end_transaction(trans, root);
1832a6d5 661fail:
39279cc3 662 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 663 btrfs_btree_balance_dirty(root, nr);
e2008b61 664 btrfs_throttle(root);
39279cc3
CM		 665 return ret;
666}
667
668static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
669{
670 struct inode *inode = dentry->d_inode;
1832a6d5 671 int err = 0;
39279cc3
CM		 672 int ret;
673 struct btrfs_root *root = BTRFS_I(dir)->root;
39279cc3 674 struct btrfs_trans_handle *trans;
1832a6d5 675 unsigned long nr = 0;
39279cc3 676
134d4512
Y		 677 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
678 return -ENOTEMPTY;
679
39279cc3 680 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 681 ret = btrfs_check_free_space(root, 1, 1);
682 if (ret)
683 goto fail;
684
39279cc3
CM		 685 trans = btrfs_start_transaction(root, 1);
686 btrfs_set_trans_block_group(trans, dir);
39279cc3
CM		 687
688 /* now the directory is empty */
689 err = btrfs_unlink_trans(trans, root, dir, dentry);
690 if (!err) {
691 inode->i_size = 0;
692 }
3954401f 693
d3c2fdcf 694 nr = trans->blocks_used;
39279cc3 695 ret = btrfs_end_transaction(trans, root);
1832a6d5 696fail:
134d4512 697 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 698 btrfs_btree_balance_dirty(root, nr);
e2008b61 699 btrfs_throttle(root);
3954401f 700
39279cc3
CM		 701 if (ret && !err)
702 err = ret;
703 return err;
704}
705
39279cc3
CM		 706/*
707 * this can truncate away extent items, csum items and directory items.
708 * It starts at a high offset and removes keys until it can't find
709 * any higher than i_size.
710 *
711 * csum items that cross the new i_size are truncated to the new size
712 * as well.
713 */
714static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
715 struct btrfs_root *root,
85e21bac
CM		 716 struct inode *inode,
717 u32 min_type)
39279cc3
CM		 718{
719 int ret;
720 struct btrfs_path *path;
721 struct btrfs_key key;
5f39d397 722 struct btrfs_key found_key;
39279cc3 723 u32 found_type;
5f39d397 724 struct extent_buffer *leaf;
39279cc3
CM		 725 struct btrfs_file_extent_item *fi;
726 u64 extent_start = 0;
db94535d 727 u64 extent_num_bytes = 0;
39279cc3 728 u64 item_end = 0;
7bb86316 729 u64 root_gen = 0;
d8d5f3e1 730 u64 root_owner = 0;
39279cc3
CM		 731 int found_extent;
732 int del_item;
85e21bac
CM		 733 int pending_del_nr = 0;
734 int pending_del_slot = 0;
179e29e4 735 int extent_type = -1;
39279cc3 736
a52d9a80 737 btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1);
39279cc3 738 path = btrfs_alloc_path();
3c69faec 739 path->reada = -1;
39279cc3 740 BUG_ON(!path);
5f39d397 741
39279cc3
CM		 742 /* FIXME, add redo link to tree so we don't leak on crash */
743 key.objectid = inode->i_ino;
744 key.offset = (u64)-1;
5f39d397
CM		 745 key.type = (u8)-1;
746
85e21bac
CM		 747 btrfs_init_path(path);
748search_again:
749 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
750 if (ret < 0) {
751 goto error;
752 }
753 if (ret > 0) {
754 BUG_ON(path->slots[0] == 0);
755 path->slots[0]--;
756 }
757
39279cc3 758 while(1) {
39279cc3 759 fi = NULL;
5f39d397
CM		 760 leaf = path->nodes[0];
761 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
762 found_type = btrfs_key_type(&found_key);
39279cc3 763
5f39d397 764 if (found_key.objectid != inode->i_ino)
39279cc3 765 break;
5f39d397 766
85e21bac 767 if (found_type < min_type)
39279cc3
CM		 768 break;
769
5f39d397 770 item_end = found_key.offset;
39279cc3 771 if (found_type == BTRFS_EXTENT_DATA_KEY) {
5f39d397 772 fi = btrfs_item_ptr(leaf, path->slots[0],
39279cc3 773 struct btrfs_file_extent_item);
179e29e4
CM		 774 extent_type = btrfs_file_extent_type(leaf, fi);
775 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
5f39d397 776 item_end +=
db94535d 777 btrfs_file_extent_num_bytes(leaf, fi);
179e29e4
CM		 778 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
779 struct btrfs_item *item = btrfs_item_nr(leaf,
780 path->slots[0]);
781 item_end += btrfs_file_extent_inline_len(leaf,
782 item);
39279cc3 783 }
008630c1 784 item_end--;
39279cc3
CM		 785 }
786 if (found_type == BTRFS_CSUM_ITEM_KEY) {
787 ret = btrfs_csum_truncate(trans, root, path,
788 inode->i_size);
789 BUG_ON(ret);
790 }
008630c1 791 if (item_end < inode->i_size) {
b888db2b
CM		 792 if (found_type == BTRFS_DIR_ITEM_KEY) {
793 found_type = BTRFS_INODE_ITEM_KEY;
794 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
795 found_type = BTRFS_CSUM_ITEM_KEY;
85e21bac
CM		 796 } else if (found_type == BTRFS_EXTENT_DATA_KEY) {
797 found_type = BTRFS_XATTR_ITEM_KEY;
798 } else if (found_type == BTRFS_XATTR_ITEM_KEY) {
799 found_type = BTRFS_INODE_REF_KEY;
b888db2b
CM		 800 } else if (found_type) {
801 found_type--;
802 } else {
803 break;
39279cc3 804 }
a61721d5 805 btrfs_set_key_type(&key, found_type);
85e21bac 806 goto next;
39279cc3 807 }
5f39d397 808 if (found_key.offset >= inode->i_size)
39279cc3
CM		 809 del_item = 1;
810 else
811 del_item = 0;
812 found_extent = 0;
813
814 /* FIXME, shrink the extent if the ref count is only 1 */
179e29e4
CM		 815 if (found_type != BTRFS_EXTENT_DATA_KEY)
816 goto delete;
817
818 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
39279cc3 819 u64 num_dec;
db94535d 820 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
39279cc3 821 if (!del_item) {
db94535d
CM		 822 u64 orig_num_bytes =
823 btrfs_file_extent_num_bytes(leaf, fi);
824 extent_num_bytes = inode->i_size -
5f39d397 825 found_key.offset + root->sectorsize - 1;
db94535d
CM		 826 btrfs_set_file_extent_num_bytes(leaf, fi,
827 extent_num_bytes);
828 num_dec = (orig_num_bytes -
829 extent_num_bytes) >> 9;
bab9fb03
Y		 830 if (extent_start != 0) {
831 inode->i_blocks -= num_dec;
832 }
5f39d397 833 btrfs_mark_buffer_dirty(leaf);
39279cc3 834 } else {
db94535d
CM		 835 extent_num_bytes =
836 btrfs_file_extent_disk_num_bytes(leaf,
837 fi);
39279cc3 838 /* FIXME blocksize != 4096 */
db94535d
CM		 839 num_dec = btrfs_file_extent_num_bytes(leaf,
840 fi) >> 9;
39279cc3
CM		 841 if (extent_start != 0) {
842 found_extent = 1;
843 inode->i_blocks -= num_dec;
844 }
d8d5f3e1
CM		 845 root_gen = btrfs_header_generation(leaf);
846 root_owner = btrfs_header_owner(leaf);
39279cc3 847 }
179e29e4
CM		 848 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE &&
849 !del_item) {
850 u32 newsize = inode->i_size - found_key.offset;
851 newsize = btrfs_file_extent_calc_inline_size(newsize);
852 ret = btrfs_truncate_item(trans, root, path,
853 newsize, 1);
854 BUG_ON(ret);
39279cc3 855 }
179e29e4 856delete:
39279cc3 857 if (del_item) {
85e21bac
CM		 858 if (!pending_del_nr) {
859 /* no pending yet, add ourselves */
860 pending_del_slot = path->slots[0];
861 pending_del_nr = 1;
862 } else if (pending_del_nr &&
863 path->slots[0] + 1 == pending_del_slot) {
864 /* hop on the pending chunk */
865 pending_del_nr++;
866 pending_del_slot = path->slots[0];
867 } else {
868 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot);
869 }
39279cc3
CM		 870 } else {
871 break;
872 }
39279cc3
CM		 873 if (found_extent) {
874 ret = btrfs_free_extent(trans, root, extent_start,
7bb86316 875 extent_num_bytes,
d8d5f3e1 876 root_owner,
7bb86316
CM		 877 root_gen, inode->i_ino,
878 found_key.offset, 0);
39279cc3
CM		 879 BUG_ON(ret);
880 }
85e21bac
CM		 881next:
882 if (path->slots[0] == 0) {
883 if (pending_del_nr)
884 goto del_pending;
885 btrfs_release_path(root, path);
886 goto search_again;
887 }
888
889 path->slots[0]--;
890 if (pending_del_nr &&
891 path->slots[0] + 1 != pending_del_slot) {
892 struct btrfs_key debug;
893del_pending:
894 btrfs_item_key_to_cpu(path->nodes[0], &debug,
895 pending_del_slot);
896 ret = btrfs_del_items(trans, root, path,
897 pending_del_slot,
898 pending_del_nr);
899 BUG_ON(ret);
900 pending_del_nr = 0;
901 btrfs_release_path(root, path);
902 goto search_again;
903 }
39279cc3
CM		 904 }
905 ret = 0;
906error:
85e21bac
CM		 907 if (pending_del_nr) {
908 ret = btrfs_del_items(trans, root, path, pending_del_slot,
909 pending_del_nr);
910 }
39279cc3
CM		 911 btrfs_release_path(root, path);
912 btrfs_free_path(path);
913 inode->i_sb->s_dirt = 1;
914 return ret;
915}
916
b888db2b 917static int btrfs_cow_one_page(struct inode *inode, struct page *page,
a52d9a80
CM		 918 size_t zero_start)
919{
920 char *kaddr;
d1310b2e 921 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
35ebb934 922 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
b888db2b 923 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
1832a6d5 924 int ret = 0;
a52d9a80 925
190662b2 926 WARN_ON(!PageLocked(page));
b3cfa35a 927 set_page_extent_mapped(page);
a52d9a80 928
d1310b2e 929 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
d1310b2e 930 set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start,
b888db2b 931 page_end, GFP_NOFS);
1832a6d5 932
a52d9a80 933 if (zero_start != PAGE_CACHE_SIZE) {
b888db2b 934 kaddr = kmap(page);
a52d9a80
CM		 935 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
936 flush_dcache_page(page);
b888db2b 937 kunmap(page);
a52d9a80 938 }
b888db2b 939 set_page_dirty(page);
d1310b2e 940 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
a52d9a80 941
a52d9a80
CM		 942 return ret;
943}
944
39279cc3
CM		 945/*
946 * taken from block_truncate_page, but does cow as it zeros out
947 * any bytes left in the last page in the file.
948 */
949static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
950{
951 struct inode *inode = mapping->host;
db94535d
CM		 952 struct btrfs_root *root = BTRFS_I(inode)->root;
953 u32 blocksize = root->sectorsize;
39279cc3
CM		 954 pgoff_t index = from >> PAGE_CACHE_SHIFT;
955 unsigned offset = from & (PAGE_CACHE_SIZE-1);
956 struct page *page;
39279cc3 957 int ret = 0;
a52d9a80 958 u64 page_start;
39279cc3
CM		 959
960 if ((offset & (blocksize - 1)) == 0)
961 goto out;
962
963 ret = -ENOMEM;
964 page = grab_cache_page(mapping, index);
965 if (!page)
966 goto out;
39279cc3 967 if (!PageUptodate(page)) {
9ebefb18 968 ret = btrfs_readpage(NULL, page);
39279cc3
CM		 969 lock_page(page);
970 if (!PageUptodate(page)) {
971 ret = -EIO;
972 goto out;
973 }
974 }
35ebb934 975 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
a52d9a80 976
b888db2b 977 ret = btrfs_cow_one_page(inode, page, offset);
39279cc3 978
39279cc3
CM		 979 unlock_page(page);
980 page_cache_release(page);
981out:
982 return ret;
983}
984
985static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
986{
987 struct inode *inode = dentry->d_inode;
988 int err;
989
990 err = inode_change_ok(inode, attr);
991 if (err)
992 return err;
993
994 if (S_ISREG(inode->i_mode) &&
995 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
996 struct btrfs_trans_handle *trans;
997 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 998 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2bf5a725 999
5f39d397 1000 u64 mask = root->sectorsize - 1;
39279cc3 1001 u64 pos = (inode->i_size + mask) & ~mask;
2bf5a725 1002 u64 block_end = attr->ia_size | mask;
5f56406a 1003 u64 hole_start;
39279cc3 1004 u64 hole_size;
179e29e4 1005 u64 alloc_hint = 0;
39279cc3
CM		 1006
1007 if (attr->ia_size <= pos)
1008 goto out;
1009
5f56406a
CM		 1010 if (pos != inode->i_size)
1011 hole_start = pos + root->sectorsize;
1012 else
1013 hole_start = pos;
1014
1832a6d5
CM		 1015 mutex_lock(&root->fs_info->fs_mutex);
1016 err = btrfs_check_free_space(root, 1, 0);
1017 mutex_unlock(&root->fs_info->fs_mutex);
1018 if (err)
1019 goto fail;
1020
39279cc3
CM		 1021 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1022
d1310b2e 1023 lock_extent(io_tree, pos, block_end, GFP_NOFS);
5f56406a 1024 hole_size = block_end - hole_start;
39279cc3
CM		 1025
1026 mutex_lock(&root->fs_info->fs_mutex);
1027 trans = btrfs_start_transaction(root, 1);
1028 btrfs_set_trans_block_group(trans, inode);
2bf5a725 1029 err = btrfs_drop_extents(trans, root, inode,
5f56406a 1030 pos, block_end, pos,
3326d1b0 1031 &alloc_hint);
2bf5a725 1032
179e29e4
CM		 1033 if (alloc_hint != EXTENT_MAP_INLINE) {
1034 err = btrfs_insert_file_extent(trans, root,
1035 inode->i_ino,
5f56406a
CM		 1036 hole_start, 0, 0,
1037 hole_size);
d1310b2e
CM		 1038 btrfs_drop_extent_cache(inode, hole_start,
1039 hole_size - 1);
5f56406a 1040 btrfs_check_file(root, inode);
179e29e4 1041 }
39279cc3
CM		 1042 btrfs_end_transaction(trans, root);
1043 mutex_unlock(&root->fs_info->fs_mutex);
d1310b2e 1044 unlock_extent(io_tree, pos, block_end, GFP_NOFS);
54aa1f4d
CM		 1045 if (err)
1046 return err;
39279cc3
CM		 1047 }
1048out:
1049 err = inode_setattr(inode, attr);
1832a6d5 1050fail:
39279cc3
CM		 1051 return err;
1052}
61295eb8 1053
2da98f00 1054void btrfs_put_inode(struct inode *inode)
61295eb8 1055{
2da98f00
CM		 1056 int ret;
1057
1058 if (!BTRFS_I(inode)->ordered_trans) {
61295eb8
CM		 1059 return;
1060 }
2da98f00
CM		 1061
1062 if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
1063 mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK))
1064 return;
1065
1066 ret = btrfs_del_ordered_inode(inode);
1067 if (ret == 1) {
1068 atomic_dec(&inode->i_count);
1069 }
61295eb8
CM		 1070}
1071
39279cc3
CM		 1072void btrfs_delete_inode(struct inode *inode)
1073{
1074 struct btrfs_trans_handle *trans;
1075 struct btrfs_root *root = BTRFS_I(inode)->root;
d3c2fdcf 1076 unsigned long nr;
39279cc3
CM		 1077 int ret;
1078
1079 truncate_inode_pages(&inode->i_data, 0);
1080 if (is_bad_inode(inode)) {
1081 goto no_delete;
1082 }
5f39d397 1083
39279cc3
CM		 1084 inode->i_size = 0;
1085 mutex_lock(&root->fs_info->fs_mutex);
1086 trans = btrfs_start_transaction(root, 1);
5f39d397 1087
39279cc3 1088 btrfs_set_trans_block_group(trans, inode);
85e21bac 1089 ret = btrfs_truncate_in_trans(trans, root, inode, 0);
54aa1f4d
CM		 1090 if (ret)
1091 goto no_delete_lock;
85e21bac 1092
d3c2fdcf 1093 nr = trans->blocks_used;
85e21bac 1094 clear_inode(inode);
5f39d397 1095
39279cc3
CM		 1096 btrfs_end_transaction(trans, root);
1097 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1098 btrfs_btree_balance_dirty(root, nr);
e2008b61 1099 btrfs_throttle(root);
39279cc3 1100 return;
54aa1f4d
CM		 1101
1102no_delete_lock:
d3c2fdcf 1103 nr = trans->blocks_used;
54aa1f4d
CM		 1104 btrfs_end_transaction(trans, root);
1105 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1106 btrfs_btree_balance_dirty(root, nr);
e2008b61 1107 btrfs_throttle(root);
39279cc3
CM		 1108no_delete:
1109 clear_inode(inode);
1110}
1111
1112/*
1113 * this returns the key found in the dir entry in the location pointer.
1114 * If no dir entries were found, location->objectid is 0.
1115 */
1116static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
1117 struct btrfs_key *location)
1118{
1119 const char *name = dentry->d_name.name;
1120 int namelen = dentry->d_name.len;
1121 struct btrfs_dir_item *di;
1122 struct btrfs_path *path;
1123 struct btrfs_root *root = BTRFS_I(dir)->root;
0d9f7f3e 1124 int ret = 0;
39279cc3 1125
3954401f
CM		 1126 if (namelen == 1 && strcmp(name, ".") == 0) {
1127 location->objectid = dir->i_ino;
1128 location->type = BTRFS_INODE_ITEM_KEY;
1129 location->offset = 0;
1130 return 0;
1131 }
39279cc3
CM		 1132 path = btrfs_alloc_path();
1133 BUG_ON(!path);
3954401f 1134
7a720536 1135 if (namelen == 2 && strcmp(name, "..") == 0) {
3954401f
CM		 1136 struct btrfs_key key;
1137 struct extent_buffer *leaf;
1138 u32 nritems;
1139 int slot;
1140
1141 key.objectid = dir->i_ino;
1142 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1143 key.offset = 0;
1144 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1145 BUG_ON(ret == 0);
1146 ret = 0;
1147
1148 leaf = path->nodes[0];
1149 slot = path->slots[0];
1150 nritems = btrfs_header_nritems(leaf);
1151 if (slot >= nritems)
1152 goto out_err;
1153
1154 btrfs_item_key_to_cpu(leaf, &key, slot);
1155 if (key.objectid != dir->i_ino ||
1156 key.type != BTRFS_INODE_REF_KEY) {
1157 goto out_err;
1158 }
1159 location->objectid = key.offset;
1160 location->type = BTRFS_INODE_ITEM_KEY;
1161 location->offset = 0;
1162 goto out;
1163 }
1164
39279cc3
CM		 1165 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1166 namelen, 0);
0d9f7f3e
Y		 1167 if (IS_ERR(di))
1168 ret = PTR_ERR(di);
39279cc3 1169 if (!di || IS_ERR(di)) {
3954401f 1170 goto out_err;
39279cc3 1171 }
5f39d397 1172 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
39279cc3 1173out:
39279cc3
CM		 1174 btrfs_free_path(path);
1175 return ret;
3954401f
CM		 1176out_err:
1177 location->objectid = 0;
1178 goto out;
39279cc3
CM		 1179}
1180
1181/*
1182 * when we hit a tree root in a directory, the btrfs part of the inode
1183 * needs to be changed to reflect the root directory of the tree root. This
1184 * is kind of like crossing a mount point.
1185 */
1186static int fixup_tree_root_location(struct btrfs_root *root,
1187 struct btrfs_key *location,
58176a96
JB		 1188 struct btrfs_root **sub_root,
1189 struct dentry *dentry)
39279cc3
CM		 1190{
1191 struct btrfs_path *path;
1192 struct btrfs_root_item *ri;
1193
1194 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1195 return 0;
1196 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1197 return 0;
1198
1199 path = btrfs_alloc_path();
1200 BUG_ON(!path);
1201 mutex_lock(&root->fs_info->fs_mutex);
1202
58176a96
JB		 1203 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1204 dentry->d_name.name,
1205 dentry->d_name.len);
39279cc3
CM		 1206 if (IS_ERR(*sub_root))
1207 return PTR_ERR(*sub_root);
1208
1209 ri = &(*sub_root)->root_item;
1210 location->objectid = btrfs_root_dirid(ri);
39279cc3
CM		 1211 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1212 location->offset = 0;
1213
1214 btrfs_free_path(path);
1215 mutex_unlock(&root->fs_info->fs_mutex);
1216 return 0;
1217}
1218
1219static int btrfs_init_locked_inode(struct inode *inode, void *p)
1220{
1221 struct btrfs_iget_args *args = p;
1222 inode->i_ino = args->ino;
1223 BTRFS_I(inode)->root = args->root;
d1310b2e
CM		 1224 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1225 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
b888db2b 1226 inode->i_mapping, GFP_NOFS);
39279cc3
CM		 1227 return 0;
1228}
1229
1230static int btrfs_find_actor(struct inode *inode, void *opaque)
1231{
1232 struct btrfs_iget_args *args = opaque;
1233 return (args->ino == inode->i_ino &&
1234 args->root == BTRFS_I(inode)->root);
1235}
1236
dc17ff8f
CM		 1237struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1238 u64 root_objectid)
1239{
1240 struct btrfs_iget_args args;
1241 args.ino = objectid;
1242 args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid);
1243
1244 if (!args.root)
1245 return NULL;
1246
1247 return ilookup5(s, objectid, btrfs_find_actor, (void *)&args);
1248}
1249
39279cc3
CM		 1250struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1251 struct btrfs_root *root)
1252{
1253 struct inode *inode;
1254 struct btrfs_iget_args args;
1255 args.ino = objectid;
1256 args.root = root;
1257
1258 inode = iget5_locked(s, objectid, btrfs_find_actor,
1259 btrfs_init_locked_inode,
1260 (void *)&args);
1261 return inode;
1262}
1263
1264static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1265 struct nameidata *nd)
1266{
1267 struct inode * inode;
1268 struct btrfs_inode *bi = BTRFS_I(dir);
1269 struct btrfs_root *root = bi->root;
1270 struct btrfs_root *sub_root = root;
1271 struct btrfs_key location;
1272 int ret;
1273
1274 if (dentry->d_name.len > BTRFS_NAME_LEN)
1275 return ERR_PTR(-ENAMETOOLONG);
5f39d397 1276
39279cc3
CM		 1277 mutex_lock(&root->fs_info->fs_mutex);
1278 ret = btrfs_inode_by_name(dir, dentry, &location);
1279 mutex_unlock(&root->fs_info->fs_mutex);
5f39d397 1280
39279cc3
CM		 1281 if (ret < 0)
1282 return ERR_PTR(ret);
5f39d397 1283
39279cc3
CM		 1284 inode = NULL;
1285 if (location.objectid) {
58176a96
JB		 1286 ret = fixup_tree_root_location(root, &location, &sub_root,
1287 dentry);
39279cc3
CM		 1288 if (ret < 0)
1289 return ERR_PTR(ret);
1290 if (ret > 0)
1291 return ERR_PTR(-ENOENT);
1292 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1293 sub_root);
1294 if (!inode)
1295 return ERR_PTR(-EACCES);
1296 if (inode->i_state & I_NEW) {
1297 /* the inode and parent dir are two different roots */
1298 if (sub_root != root) {
1299 igrab(inode);
1300 sub_root->inode = inode;
1301 }
1302 BTRFS_I(inode)->root = sub_root;
1303 memcpy(&BTRFS_I(inode)->location, &location,
1304 sizeof(location));
1305 btrfs_read_locked_inode(inode);
1306 unlock_new_inode(inode);
1307 }
1308 }
1309 return d_splice_alias(inode, dentry);
1310}
1311
39279cc3
CM		 1312static unsigned char btrfs_filetype_table[] = {
1313 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1314};
1315
1316static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1317{
6da6abae 1318 struct inode *inode = filp->f_dentry->d_inode;
39279cc3
CM		 1319 struct btrfs_root *root = BTRFS_I(inode)->root;
1320 struct btrfs_item *item;
1321 struct btrfs_dir_item *di;
1322 struct btrfs_key key;
5f39d397 1323 struct btrfs_key found_key;
39279cc3
CM		 1324 struct btrfs_path *path;
1325 int ret;
1326 u32 nritems;
5f39d397 1327 struct extent_buffer *leaf;
39279cc3
CM		 1328 int slot;
1329 int advance;
1330 unsigned char d_type;
1331 int over = 0;
1332 u32 di_cur;
1333 u32 di_total;
1334 u32 di_len;
1335 int key_type = BTRFS_DIR_INDEX_KEY;
5f39d397
CM		 1336 char tmp_name[32];
1337 char *name_ptr;
1338 int name_len;
39279cc3
CM		 1339
1340 /* FIXME, use a real flag for deciding about the key type */
1341 if (root->fs_info->tree_root == root)
1342 key_type = BTRFS_DIR_ITEM_KEY;
5f39d397 1343
3954401f
CM		 1344 /* special case for "." */
1345 if (filp->f_pos == 0) {
1346 over = filldir(dirent, ".", 1,
1347 1, inode->i_ino,
1348 DT_DIR);
1349 if (over)
1350 return 0;
1351 filp->f_pos = 1;
1352 }
1353
39279cc3
CM		 1354 mutex_lock(&root->fs_info->fs_mutex);
1355 key.objectid = inode->i_ino;
3954401f
CM		 1356 path = btrfs_alloc_path();
1357 path->reada = 2;
1358
1359 /* special case for .., just use the back ref */
1360 if (filp->f_pos == 1) {
1361 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1362 key.offset = 0;
1363 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1364 BUG_ON(ret == 0);
1365 leaf = path->nodes[0];
1366 slot = path->slots[0];
1367 nritems = btrfs_header_nritems(leaf);
1368 if (slot >= nritems) {
1369 btrfs_release_path(root, path);
1370 goto read_dir_items;
1371 }
1372 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1373 btrfs_release_path(root, path);
1374 if (found_key.objectid != key.objectid ||
1375 found_key.type != BTRFS_INODE_REF_KEY)
1376 goto read_dir_items;
1377 over = filldir(dirent, "..", 2,
1378 2, found_key.offset, DT_DIR);
1379 if (over)
1380 goto nopos;
1381 filp->f_pos = 2;
1382 }
1383
1384read_dir_items:
39279cc3
CM		 1385 btrfs_set_key_type(&key, key_type);
1386 key.offset = filp->f_pos;
5f39d397 1387
39279cc3
CM		 1388 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1389 if (ret < 0)
1390 goto err;
1391 advance = 0;
39279cc3 1392 while(1) {
5f39d397
CM		 1393 leaf = path->nodes[0];
1394 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1395 slot = path->slots[0];
1396 if (advance || slot >= nritems) {
1397 if (slot >= nritems -1) {
39279cc3
CM		 1398 ret = btrfs_next_leaf(root, path);
1399 if (ret)
1400 break;
5f39d397
CM		 1401 leaf = path->nodes[0];
1402 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1403 slot = path->slots[0];
1404 } else {
1405 slot++;
1406 path->slots[0]++;
1407 }
1408 }
1409 advance = 1;
5f39d397
CM		 1410 item = btrfs_item_nr(leaf, slot);
1411 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1412
1413 if (found_key.objectid != key.objectid)
39279cc3 1414 break;
5f39d397 1415 if (btrfs_key_type(&found_key) != key_type)
39279cc3 1416 break;
5f39d397 1417 if (found_key.offset < filp->f_pos)
39279cc3 1418 continue;
5f39d397
CM		 1419
1420 filp->f_pos = found_key.offset;
39279cc3
CM		 1421 advance = 1;
1422 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1423 di_cur = 0;
5f39d397 1424 di_total = btrfs_item_size(leaf, item);
39279cc3 1425 while(di_cur < di_total) {
5f39d397
CM		 1426 struct btrfs_key location;
1427
1428 name_len = btrfs_dir_name_len(leaf, di);
1429 if (name_len < 32) {
1430 name_ptr = tmp_name;
1431 } else {
1432 name_ptr = kmalloc(name_len, GFP_NOFS);
1433 BUG_ON(!name_ptr);
1434 }
1435 read_extent_buffer(leaf, name_ptr,
1436 (unsigned long)(di + 1), name_len);
1437
1438 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1439 btrfs_dir_item_key_to_cpu(leaf, di, &location);
5f39d397
CM		 1440 over = filldir(dirent, name_ptr, name_len,
1441 found_key.offset,
1442 location.objectid,
39279cc3 1443 d_type);
5f39d397
CM		 1444
1445 if (name_ptr != tmp_name)
1446 kfree(name_ptr);
1447
39279cc3
CM		 1448 if (over)
1449 goto nopos;
5103e947
JB		 1450 di_len = btrfs_dir_name_len(leaf, di) +
1451 btrfs_dir_data_len(leaf, di) +sizeof(*di);
39279cc3
CM		 1452 di_cur += di_len;
1453 di = (struct btrfs_dir_item *)((char *)di + di_len);
1454 }
1455 }
c2a8b6e1 1456 filp->f_pos = INT_LIMIT(typeof(filp->f_pos));
39279cc3
CM		 1457nopos:
1458 ret = 0;
1459err:
1460 btrfs_release_path(root, path);
1461 btrfs_free_path(path);
1462 mutex_unlock(&root->fs_info->fs_mutex);
1463 return ret;
1464}
1465
1466int btrfs_write_inode(struct inode *inode, int wait)
1467{
1468 struct btrfs_root *root = BTRFS_I(inode)->root;
1469 struct btrfs_trans_handle *trans;
1470 int ret = 0;
1471
1472 if (wait) {
1473 mutex_lock(&root->fs_info->fs_mutex);
1474 trans = btrfs_start_transaction(root, 1);
1475 btrfs_set_trans_block_group(trans, inode);
1476 ret = btrfs_commit_transaction(trans, root);
1477 mutex_unlock(&root->fs_info->fs_mutex);
1478 }
1479 return ret;
1480}
1481
1482/*
54aa1f4d 1483 * This is somewhat expensive, updating the tree every time the
39279cc3
CM		 1484 * inode changes. But, it is most likely to find the inode in cache.
1485 * FIXME, needs more benchmarking...there are no reasons other than performance
1486 * to keep or drop this code.
1487 */
1488void btrfs_dirty_inode(struct inode *inode)
1489{
1490 struct btrfs_root *root = BTRFS_I(inode)->root;
1491 struct btrfs_trans_handle *trans;
1492
1493 mutex_lock(&root->fs_info->fs_mutex);
1494 trans = btrfs_start_transaction(root, 1);
1495 btrfs_set_trans_block_group(trans, inode);
1496 btrfs_update_inode(trans, root, inode);
1497 btrfs_end_transaction(trans, root);
1498 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 1499}
1500
1501static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1502 struct btrfs_root *root,
9c58309d
CM		 1503 const char *name, int name_len,
1504 u64 ref_objectid,
39279cc3
CM		 1505 u64 objectid,
1506 struct btrfs_block_group_cache *group,
1507 int mode)
1508{
1509 struct inode *inode;
5f39d397 1510 struct btrfs_inode_item *inode_item;
39279cc3 1511 struct btrfs_key *location;
5f39d397 1512 struct btrfs_path *path;
9c58309d
CM		 1513 struct btrfs_inode_ref *ref;
1514 struct btrfs_key key[2];
1515 u32 sizes[2];
1516 unsigned long ptr;
39279cc3
CM		 1517 int ret;
1518 int owner;
1519
5f39d397
CM		 1520 path = btrfs_alloc_path();
1521 BUG_ON(!path);
1522
39279cc3
CM		 1523 inode = new_inode(root->fs_info->sb);
1524 if (!inode)
1525 return ERR_PTR(-ENOMEM);
1526
d1310b2e
CM		 1527 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1528 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
b888db2b 1529 inode->i_mapping, GFP_NOFS);
39279cc3 1530 BTRFS_I(inode)->root = root;
b888db2b 1531
39279cc3
CM		 1532 if (mode & S_IFDIR)
1533 owner = 0;
1534 else
1535 owner = 1;
1536 group = btrfs_find_block_group(root, group, 0, 0, owner);
1537 BTRFS_I(inode)->block_group = group;
b98b6767 1538 BTRFS_I(inode)->flags = 0;
9c58309d
CM		 1539
1540 key[0].objectid = objectid;
1541 btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY);
1542 key[0].offset = 0;
1543
1544 key[1].objectid = objectid;
1545 btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY);
1546 key[1].offset = ref_objectid;
1547
1548 sizes[0] = sizeof(struct btrfs_inode_item);
1549 sizes[1] = name_len + sizeof(*ref);
1550
1551 ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2);
1552 if (ret != 0)
5f39d397
CM		 1553 goto fail;
1554
9c58309d
CM		 1555 if (objectid > root->highest_inode)
1556 root->highest_inode = objectid;
1557
39279cc3
CM		 1558 inode->i_uid = current->fsuid;
1559 inode->i_gid = current->fsgid;
1560 inode->i_mode = mode;
1561 inode->i_ino = objectid;
1562 inode->i_blocks = 0;
1563 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
5f39d397
CM		 1564 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1565 struct btrfs_inode_item);
1566 fill_inode_item(path->nodes[0], inode_item, inode);
9c58309d
CM		 1567
1568 ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
1569 struct btrfs_inode_ref);
1570 btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
1571 ptr = (unsigned long)(ref + 1);
1572 write_extent_buffer(path->nodes[0], name, ptr, name_len);
1573
5f39d397
CM		 1574 btrfs_mark_buffer_dirty(path->nodes[0]);
1575 btrfs_free_path(path);
1576
39279cc3
CM		 1577 location = &BTRFS_I(inode)->location;
1578 location->objectid = objectid;
39279cc3
CM		 1579 location->offset = 0;
1580 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1581
39279cc3
CM		 1582 insert_inode_hash(inode);
1583 return inode;
5f39d397
CM		 1584fail:
1585 btrfs_free_path(path);
1586 return ERR_PTR(ret);
39279cc3
CM		 1587}
1588
1589static inline u8 btrfs_inode_type(struct inode *inode)
1590{
1591 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1592}
1593
1594static int btrfs_add_link(struct btrfs_trans_handle *trans,
9c58309d
CM		 1595 struct dentry *dentry, struct inode *inode,
1596 int add_backref)
39279cc3
CM		 1597{
1598 int ret;
1599 struct btrfs_key key;
1600 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
79c44584 1601 struct inode *parent_inode;
5f39d397 1602
39279cc3 1603 key.objectid = inode->i_ino;
39279cc3
CM		 1604 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1605 key.offset = 0;
1606
1607 ret = btrfs_insert_dir_item(trans, root,
1608 dentry->d_name.name, dentry->d_name.len,
1609 dentry->d_parent->d_inode->i_ino,
1610 &key, btrfs_inode_type(inode));
1611 if (ret == 0) {
9c58309d
CM		 1612 if (add_backref) {
1613 ret = btrfs_insert_inode_ref(trans, root,
1614 dentry->d_name.name,
1615 dentry->d_name.len,
1616 inode->i_ino,
1617 dentry->d_parent->d_inode->i_ino);
1618 }
79c44584
CM		 1619 parent_inode = dentry->d_parent->d_inode;
1620 parent_inode->i_size += dentry->d_name.len * 2;
1621 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
39279cc3
CM		 1622 ret = btrfs_update_inode(trans, root,
1623 dentry->d_parent->d_inode);
1624 }
1625 return ret;
1626}
1627
1628static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
9c58309d
CM		 1629 struct dentry *dentry, struct inode *inode,
1630 int backref)
39279cc3 1631{
9c58309d 1632 int err = btrfs_add_link(trans, dentry, inode, backref);
39279cc3
CM		 1633 if (!err) {
1634 d_instantiate(dentry, inode);
1635 return 0;
1636 }
1637 if (err > 0)
1638 err = -EEXIST;
1639 return err;
1640}
1641
618e21d5
JB		 1642static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1643 int mode, dev_t rdev)
1644{
1645 struct btrfs_trans_handle *trans;
1646 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 1647 struct inode *inode = NULL;
618e21d5
JB		 1648 int err;
1649 int drop_inode = 0;
1650 u64 objectid;
1832a6d5 1651 unsigned long nr = 0;
618e21d5
JB		 1652
1653 if (!new_valid_dev(rdev))
1654 return -EINVAL;
1655
1656 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1657 err = btrfs_check_free_space(root, 1, 0);
1658 if (err)
1659 goto fail;
1660
618e21d5
JB		 1661 trans = btrfs_start_transaction(root, 1);
1662 btrfs_set_trans_block_group(trans, dir);
1663
1664 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1665 if (err) {
1666 err = -ENOSPC;
1667 goto out_unlock;
1668 }
1669
9c58309d
CM		 1670 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1671 dentry->d_name.len,
1672 dentry->d_parent->d_inode->i_ino, objectid,
618e21d5
JB		 1673 BTRFS_I(dir)->block_group, mode);
1674 err = PTR_ERR(inode);
1675 if (IS_ERR(inode))
1676 goto out_unlock;
1677
1678 btrfs_set_trans_block_group(trans, inode);
9c58309d 1679 err = btrfs_add_nondir(trans, dentry, inode, 0);
618e21d5
JB		 1680 if (err)
1681 drop_inode = 1;
1682 else {
1683 inode->i_op = &btrfs_special_inode_operations;
1684 init_special_inode(inode, inode->i_mode, rdev);
1b4ab1bb 1685 btrfs_update_inode(trans, root, inode);
618e21d5
JB		 1686 }
1687 dir->i_sb->s_dirt = 1;
1688 btrfs_update_inode_block_group(trans, inode);
1689 btrfs_update_inode_block_group(trans, dir);
1690out_unlock:
d3c2fdcf 1691 nr = trans->blocks_used;
618e21d5 1692 btrfs_end_transaction(trans, root);
1832a6d5 1693fail:
618e21d5
JB		 1694 mutex_unlock(&root->fs_info->fs_mutex);
1695
1696 if (drop_inode) {
1697 inode_dec_link_count(inode);
1698 iput(inode);
1699 }
d3c2fdcf 1700 btrfs_btree_balance_dirty(root, nr);
e2008b61 1701 btrfs_throttle(root);
618e21d5
JB		 1702 return err;
1703}
1704
39279cc3
CM		 1705static int btrfs_create(struct inode *dir, struct dentry *dentry,
1706 int mode, struct nameidata *nd)
1707{
1708 struct btrfs_trans_handle *trans;
1709 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 1710 struct inode *inode = NULL;
39279cc3
CM		 1711 int err;
1712 int drop_inode = 0;
1832a6d5 1713 unsigned long nr = 0;
39279cc3
CM		 1714 u64 objectid;
1715
1716 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1717 err = btrfs_check_free_space(root, 1, 0);
1718 if (err)
1719 goto fail;
39279cc3
CM		 1720 trans = btrfs_start_transaction(root, 1);
1721 btrfs_set_trans_block_group(trans, dir);
1722
1723 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1724 if (err) {
1725 err = -ENOSPC;
1726 goto out_unlock;
1727 }
1728
9c58309d
CM		 1729 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1730 dentry->d_name.len,
1731 dentry->d_parent->d_inode->i_ino,
1732 objectid, BTRFS_I(dir)->block_group, mode);
39279cc3
CM		 1733 err = PTR_ERR(inode);
1734 if (IS_ERR(inode))
1735 goto out_unlock;
1736
1737 btrfs_set_trans_block_group(trans, inode);
9c58309d 1738 err = btrfs_add_nondir(trans, dentry, inode, 0);
39279cc3
CM		 1739 if (err)
1740 drop_inode = 1;
1741 else {
1742 inode->i_mapping->a_ops = &btrfs_aops;
1743 inode->i_fop = &btrfs_file_operations;
1744 inode->i_op = &btrfs_file_inode_operations;
d1310b2e
CM		 1745 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1746 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
a52d9a80 1747 inode->i_mapping, GFP_NOFS);
d1310b2e 1748 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 1749 }
1750 dir->i_sb->s_dirt = 1;
1751 btrfs_update_inode_block_group(trans, inode);
1752 btrfs_update_inode_block_group(trans, dir);
1753out_unlock:
d3c2fdcf 1754 nr = trans->blocks_used;
39279cc3 1755 btrfs_end_transaction(trans, root);
1832a6d5 1756fail:
39279cc3
CM		 1757 mutex_unlock(&root->fs_info->fs_mutex);
1758
1759 if (drop_inode) {
1760 inode_dec_link_count(inode);
1761 iput(inode);
1762 }
d3c2fdcf 1763 btrfs_btree_balance_dirty(root, nr);
e2008b61 1764 btrfs_throttle(root);
39279cc3
CM		 1765 return err;
1766}
1767
1768static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1769 struct dentry *dentry)
1770{
1771 struct btrfs_trans_handle *trans;
1772 struct btrfs_root *root = BTRFS_I(dir)->root;
1773 struct inode *inode = old_dentry->d_inode;
1832a6d5 1774 unsigned long nr = 0;
39279cc3
CM		 1775 int err;
1776 int drop_inode = 0;
1777
1778 if (inode->i_nlink == 0)
1779 return -ENOENT;
1780
6da6abae
CM		 1781#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1782 inode->i_nlink++;
1783#else
39279cc3 1784 inc_nlink(inode);
6da6abae 1785#endif
39279cc3 1786 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1787 err = btrfs_check_free_space(root, 1, 0);
1788 if (err)
1789 goto fail;
39279cc3 1790 trans = btrfs_start_transaction(root, 1);
5f39d397 1791
39279cc3
CM		 1792 btrfs_set_trans_block_group(trans, dir);
1793 atomic_inc(&inode->i_count);
9c58309d 1794 err = btrfs_add_nondir(trans, dentry, inode, 1);
5f39d397 1795
39279cc3
CM		 1796 if (err)
1797 drop_inode = 1;
5f39d397 1798
39279cc3
CM		 1799 dir->i_sb->s_dirt = 1;
1800 btrfs_update_inode_block_group(trans, dir);
54aa1f4d 1801 err = btrfs_update_inode(trans, root, inode);
5f39d397 1802
54aa1f4d
CM		 1803 if (err)
1804 drop_inode = 1;
39279cc3 1805
d3c2fdcf 1806 nr = trans->blocks_used;
39279cc3 1807 btrfs_end_transaction(trans, root);
1832a6d5 1808fail:
39279cc3
CM		 1809 mutex_unlock(&root->fs_info->fs_mutex);
1810
1811 if (drop_inode) {
1812 inode_dec_link_count(inode);
1813 iput(inode);
1814 }
d3c2fdcf 1815 btrfs_btree_balance_dirty(root, nr);
e2008b61 1816 btrfs_throttle(root);
39279cc3
CM		 1817 return err;
1818}
1819
39279cc3
CM		 1820static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1821{
1822 struct inode *inode;
1823 struct btrfs_trans_handle *trans;
1824 struct btrfs_root *root = BTRFS_I(dir)->root;
1825 int err = 0;
1826 int drop_on_err = 0;
1827 u64 objectid;
d3c2fdcf 1828 unsigned long nr = 1;
39279cc3
CM		 1829
1830 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1831 err = btrfs_check_free_space(root, 1, 0);
1832 if (err)
1833 goto out_unlock;
1834
39279cc3
CM		 1835 trans = btrfs_start_transaction(root, 1);
1836 btrfs_set_trans_block_group(trans, dir);
5f39d397 1837
39279cc3
CM		 1838 if (IS_ERR(trans)) {
1839 err = PTR_ERR(trans);
1840 goto out_unlock;
1841 }
1842
1843 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1844 if (err) {
1845 err = -ENOSPC;
1846 goto out_unlock;
1847 }
1848
9c58309d
CM		 1849 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1850 dentry->d_name.len,
1851 dentry->d_parent->d_inode->i_ino, objectid,
39279cc3
CM		 1852 BTRFS_I(dir)->block_group, S_IFDIR | mode);
1853 if (IS_ERR(inode)) {
1854 err = PTR_ERR(inode);
1855 goto out_fail;
1856 }
5f39d397 1857
39279cc3
CM		 1858 drop_on_err = 1;
1859 inode->i_op = &btrfs_dir_inode_operations;
1860 inode->i_fop = &btrfs_dir_file_operations;
1861 btrfs_set_trans_block_group(trans, inode);
1862
3954401f 1863 inode->i_size = 0;
39279cc3
CM		 1864 err = btrfs_update_inode(trans, root, inode);
1865 if (err)
1866 goto out_fail;
5f39d397 1867
9c58309d 1868 err = btrfs_add_link(trans, dentry, inode, 0);
39279cc3
CM		 1869 if (err)
1870 goto out_fail;
5f39d397 1871
39279cc3
CM		 1872 d_instantiate(dentry, inode);
1873 drop_on_err = 0;
1874 dir->i_sb->s_dirt = 1;
1875 btrfs_update_inode_block_group(trans, inode);
1876 btrfs_update_inode_block_group(trans, dir);
1877
1878out_fail:
d3c2fdcf 1879 nr = trans->blocks_used;
39279cc3 1880 btrfs_end_transaction(trans, root);
5f39d397 1881
39279cc3
CM		 1882out_unlock:
1883 mutex_unlock(&root->fs_info->fs_mutex);
1884 if (drop_on_err)
1885 iput(inode);
d3c2fdcf 1886 btrfs_btree_balance_dirty(root, nr);
e2008b61 1887 btrfs_throttle(root);
39279cc3
CM		 1888 return err;
1889}
1890
a52d9a80 1891struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
70dec807 1892 size_t pg_offset, u64 start, u64 len,
a52d9a80
CM		 1893 int create)
1894{
1895 int ret;
1896 int err = 0;
db94535d 1897 u64 bytenr;
a52d9a80
CM		 1898 u64 extent_start = 0;
1899 u64 extent_end = 0;
1900 u64 objectid = inode->i_ino;
1901 u32 found_type;
a52d9a80
CM		 1902 struct btrfs_path *path;
1903 struct btrfs_root *root = BTRFS_I(inode)->root;
1904 struct btrfs_file_extent_item *item;
5f39d397
CM		 1905 struct extent_buffer *leaf;
1906 struct btrfs_key found_key;
a52d9a80
CM		 1907 struct extent_map *em = NULL;
1908 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
d1310b2e 1909 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
a52d9a80
CM		 1910 struct btrfs_trans_handle *trans = NULL;
1911
1912 path = btrfs_alloc_path();
1913 BUG_ON(!path);
1914 mutex_lock(&root->fs_info->fs_mutex);
1915
1916again:
d1310b2e
CM		 1917 spin_lock(&em_tree->lock);
1918 em = lookup_extent_mapping(em_tree, start, len);
1919 spin_unlock(&em_tree->lock);
1920
a52d9a80 1921 if (em) {
56b453c9 1922 if (em->start > start) {
d1310b2e
CM		 1923 printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n",
1924 start, len, em->start, em->len);
56b453c9
CM		 1925 WARN_ON(1);
1926 }
70dec807
CM		 1927 if (em->block_start == EXTENT_MAP_INLINE && page)
1928 free_extent_map(em);
1929 else
1930 goto out;
a52d9a80 1931 }
d1310b2e 1932 em = alloc_extent_map(GFP_NOFS);
a52d9a80 1933 if (!em) {
d1310b2e
CM		 1934 err = -ENOMEM;
1935 goto out;
a52d9a80 1936 }
d1310b2e
CM		 1937
1938 em->start = EXTENT_MAP_HOLE;
1939 em->len = (u64)-1;
a52d9a80 1940 em->bdev = inode->i_sb->s_bdev;
179e29e4
CM		 1941 ret = btrfs_lookup_file_extent(trans, root, path,
1942 objectid, start, trans != NULL);
a52d9a80
CM		 1943 if (ret < 0) {
1944 err = ret;
1945 goto out;
1946 }
1947
1948 if (ret != 0) {
1949 if (path->slots[0] == 0)
1950 goto not_found;
1951 path->slots[0]--;
1952 }
1953
5f39d397
CM		 1954 leaf = path->nodes[0];
1955 item = btrfs_item_ptr(leaf, path->slots[0],
a52d9a80 1956 struct btrfs_file_extent_item);
a52d9a80 1957 /* are we inside the extent that was found? */
5f39d397
CM		 1958 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1959 found_type = btrfs_key_type(&found_key);
1960 if (found_key.objectid != objectid ||
a52d9a80
CM		 1961 found_type != BTRFS_EXTENT_DATA_KEY) {
1962 goto not_found;
1963 }
1964
5f39d397
CM		 1965 found_type = btrfs_file_extent_type(leaf, item);
1966 extent_start = found_key.offset;
a52d9a80
CM		 1967 if (found_type == BTRFS_FILE_EXTENT_REG) {
1968 extent_end = extent_start +
db94535d 1969 btrfs_file_extent_num_bytes(leaf, item);
a52d9a80 1970 err = 0;
b888db2b 1971 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 1972 em->start = start;
1973 if (start < extent_start) {
d1310b2e 1974 if (start + len <= extent_start)
b888db2b 1975 goto not_found;
d1310b2e 1976 em->len = extent_end - extent_start;
a52d9a80 1977 } else {
d1310b2e 1978 em->len = len;
a52d9a80
CM		 1979 }
1980 goto not_found_em;
1981 }
db94535d
CM		 1982 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
1983 if (bytenr == 0) {
a52d9a80 1984 em->start = extent_start;
d1310b2e 1985 em->len = extent_end - extent_start;
5f39d397 1986 em->block_start = EXTENT_MAP_HOLE;
a52d9a80
CM		 1987 goto insert;
1988 }
db94535d
CM		 1989 bytenr += btrfs_file_extent_offset(leaf, item);
1990 em->block_start = bytenr;
a52d9a80 1991 em->start = extent_start;
d1310b2e 1992 em->len = extent_end - extent_start;
a52d9a80
CM		 1993 goto insert;
1994 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
70dec807 1995 u64 page_start;
5f39d397 1996 unsigned long ptr;
a52d9a80 1997 char *map;
3326d1b0
CM		 1998 size_t size;
1999 size_t extent_offset;
2000 size_t copy_size;
a52d9a80 2001
5f39d397
CM		 2002 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
2003 path->slots[0]));
d1310b2e
CM		 2004 extent_end = (extent_start + size + root->sectorsize - 1) &
2005 ~((u64)root->sectorsize - 1);
b888db2b 2006 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 2007 em->start = start;
2008 if (start < extent_start) {
d1310b2e 2009 if (start + len <= extent_start)
b888db2b 2010 goto not_found;
d1310b2e 2011 em->len = extent_end - extent_start;
a52d9a80 2012 } else {
d1310b2e 2013 em->len = len;
a52d9a80
CM		 2014 }
2015 goto not_found_em;
2016 }
689f9346 2017 em->block_start = EXTENT_MAP_INLINE;
689f9346
Y		 2018
2019 if (!page) {
2020 em->start = extent_start;
d1310b2e 2021 em->len = size;
689f9346
Y		 2022 goto out;
2023 }
5f39d397 2024
70dec807
CM		 2025 page_start = page_offset(page) + pg_offset;
2026 extent_offset = page_start - extent_start;
2027 copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset,
3326d1b0 2028 size - extent_offset);
3326d1b0 2029 em->start = extent_start + extent_offset;
70dec807
CM		 2030 em->len = (copy_size + root->sectorsize - 1) &
2031 ~((u64)root->sectorsize - 1);
689f9346
Y		 2032 map = kmap(page);
2033 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
179e29e4 2034 if (create == 0 && !PageUptodate(page)) {
70dec807 2035 read_extent_buffer(leaf, map + pg_offset, ptr,
179e29e4
CM		 2036 copy_size);
2037 flush_dcache_page(page);
2038 } else if (create && PageUptodate(page)) {
2039 if (!trans) {
2040 kunmap(page);
2041 free_extent_map(em);
2042 em = NULL;
2043 btrfs_release_path(root, path);
2044 trans = btrfs_start_transaction(root, 1);
2045 goto again;
2046 }
70dec807 2047 write_extent_buffer(leaf, map + pg_offset, ptr,
179e29e4
CM		 2048 copy_size);
2049 btrfs_mark_buffer_dirty(leaf);
a52d9a80 2050 }
a52d9a80 2051 kunmap(page);
d1310b2e
CM		 2052 set_extent_uptodate(io_tree, em->start,
2053 extent_map_end(em) - 1, GFP_NOFS);
a52d9a80
CM		 2054 goto insert;
2055 } else {
2056 printk("unkknown found_type %d\n", found_type);
2057 WARN_ON(1);
2058 }
2059not_found:
2060 em->start = start;
d1310b2e 2061 em->len = len;
a52d9a80 2062not_found_em:
5f39d397 2063 em->block_start = EXTENT_MAP_HOLE;
a52d9a80
CM		 2064insert:
2065 btrfs_release_path(root, path);
d1310b2e
CM		 2066 if (em->start > start || extent_map_end(em) <= start) {
2067 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len);
a52d9a80
CM		 2068 err = -EIO;
2069 goto out;
2070 }
d1310b2e
CM		 2071
2072 err = 0;
2073 spin_lock(&em_tree->lock);
a52d9a80
CM		 2074 ret = add_extent_mapping(em_tree, em);
2075 if (ret == -EEXIST) {
2076 free_extent_map(em);
d1310b2e
CM		 2077 em = lookup_extent_mapping(em_tree, start, len);
2078 if (!em) {
a52d9a80 2079 err = -EIO;
d1310b2e 2080 printk("failing to insert %Lu %Lu\n", start, len);
a52d9a80 2081 }
a52d9a80 2082 }
d1310b2e 2083 spin_unlock(&em_tree->lock);
a52d9a80
CM		 2084out:
2085 btrfs_free_path(path);
2086 if (trans) {
2087 ret = btrfs_end_transaction(trans, root);
2088 if (!err)
2089 err = ret;
2090 }
2091 mutex_unlock(&root->fs_info->fs_mutex);
2092 if (err) {
2093 free_extent_map(em);
2094 WARN_ON(1);
2095 return ERR_PTR(err);
2096 }
2097 return em;
2098}
2099
d396c6f5 2100static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
39279cc3 2101{
d396c6f5 2102 return extent_bmap(mapping, iblock, btrfs_get_extent);
39279cc3
CM		 2103}
2104
a52d9a80 2105int btrfs_readpage(struct file *file, struct page *page)
9ebefb18 2106{
d1310b2e
CM		 2107 struct extent_io_tree *tree;
2108 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80 2109 return extent_read_full_page(tree, page, btrfs_get_extent);
9ebefb18 2110}
1832a6d5 2111
a52d9a80 2112static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
39279cc3 2113{
d1310b2e 2114 struct extent_io_tree *tree;
b888db2b
CM		 2115
2116
2117 if (current->flags & PF_MEMALLOC) {
2118 redirty_page_for_writepage(wbc, page);
2119 unlock_page(page);
2120 return 0;
2121 }
d1310b2e 2122 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80 2123 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
9ebefb18
CM		 2124}
2125
b293f02e
CM		 2126static int btrfs_writepages(struct address_space *mapping,
2127 struct writeback_control *wbc)
2128{
d1310b2e
CM		 2129 struct extent_io_tree *tree;
2130 tree = &BTRFS_I(mapping->host)->io_tree;
b293f02e
CM		 2131 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
2132}
2133
3ab2fb5a
CM		 2134static int
2135btrfs_readpages(struct file *file, struct address_space *mapping,
2136 struct list_head *pages, unsigned nr_pages)
2137{
d1310b2e
CM		 2138 struct extent_io_tree *tree;
2139 tree = &BTRFS_I(mapping->host)->io_tree;
3ab2fb5a
CM		 2140 return extent_readpages(tree, mapping, pages, nr_pages,
2141 btrfs_get_extent);
2142}
2143
70dec807 2144static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
9ebefb18 2145{
d1310b2e
CM		 2146 struct extent_io_tree *tree;
2147 struct extent_map_tree *map;
a52d9a80 2148 int ret;
8c2383c3 2149
d1310b2e
CM		 2150 tree = &BTRFS_I(page->mapping->host)->io_tree;
2151 map = &BTRFS_I(page->mapping->host)->extent_tree;
70dec807 2152 ret = try_release_extent_mapping(map, tree, page, gfp_flags);
a52d9a80
CM		 2153 if (ret == 1) {
2154 ClearPagePrivate(page);
2155 set_page_private(page, 0);
2156 page_cache_release(page);
39279cc3 2157 }
a52d9a80 2158 return ret;
39279cc3
CM		 2159}
2160
a52d9a80 2161static void btrfs_invalidatepage(struct page *page, unsigned long offset)
39279cc3 2162{
d1310b2e 2163 struct extent_io_tree *tree;
39279cc3 2164
d1310b2e 2165 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80
CM		 2166 extent_invalidatepage(tree, page, offset);
2167 btrfs_releasepage(page, GFP_NOFS);
39279cc3
CM		 2168}
2169
9ebefb18
CM		 2170/*
2171 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2172 * called from a page fault handler when a page is first dirtied. Hence we must
2173 * be careful to check for EOF conditions here. We set the page up correctly
2174 * for a written page which means we get ENOSPC checking when writing into
2175 * holes and correct delalloc and unwritten extent mapping on filesystems that
2176 * support these features.
2177 *
2178 * We are not allowed to take the i_mutex here so we have to play games to
2179 * protect against truncate races as the page could now be beyond EOF. Because
2180 * vmtruncate() writes the inode size before removing pages, once we have the
2181 * page lock we can determine safely if the page is beyond EOF. If it is not
2182 * beyond EOF, then the page is guaranteed safe against truncation until we
2183 * unlock the page.
2184 */
2185int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
2186{
6da6abae 2187 struct inode *inode = fdentry(vma->vm_file)->d_inode;
1832a6d5 2188 struct btrfs_root *root = BTRFS_I(inode)->root;
9ebefb18
CM		 2189 unsigned long end;
2190 loff_t size;
1832a6d5 2191 int ret;
a52d9a80 2192 u64 page_start;
9ebefb18 2193
1832a6d5
CM		 2194 mutex_lock(&root->fs_info->fs_mutex);
2195 ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
8f662a76 2196 mutex_unlock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2197 if (ret)
2198 goto out;
2199
2200 ret = -EINVAL;
2201
9ebefb18
CM		 2202 lock_page(page);
2203 wait_on_page_writeback(page);
9ebefb18 2204 size = i_size_read(inode);
35ebb934 2205 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
a52d9a80 2206
9ebefb18 2207 if ((page->mapping != inode->i_mapping) ||
a52d9a80 2208 (page_start > size)) {
9ebefb18
CM		 2209 /* page got truncated out from underneath us */
2210 goto out_unlock;
2211 }
2212
2213 /* page is wholly or partially inside EOF */
a52d9a80 2214 if (page_start + PAGE_CACHE_SIZE > size)
9ebefb18
CM		 2215 end = size & ~PAGE_CACHE_MASK;
2216 else
2217 end = PAGE_CACHE_SIZE;
2218
b888db2b 2219 ret = btrfs_cow_one_page(inode, page, end);
9ebefb18
CM		 2220
2221out_unlock:
2222 unlock_page(page);
1832a6d5 2223out:
9ebefb18
CM		 2224 return ret;
2225}
2226
39279cc3
CM		 2227static void btrfs_truncate(struct inode *inode)
2228{
2229 struct btrfs_root *root = BTRFS_I(inode)->root;
2230 int ret;
2231 struct btrfs_trans_handle *trans;
d3c2fdcf 2232 unsigned long nr;
39279cc3
CM		 2233
2234 if (!S_ISREG(inode->i_mode))
2235 return;
2236 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2237 return;
2238
2239 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2240
2241 mutex_lock(&root->fs_info->fs_mutex);
2242 trans = btrfs_start_transaction(root, 1);
2243 btrfs_set_trans_block_group(trans, inode);
2244
2245 /* FIXME, add redo link to tree so we don't leak on crash */
85e21bac
CM		 2246 ret = btrfs_truncate_in_trans(trans, root, inode,
2247 BTRFS_EXTENT_DATA_KEY);
39279cc3 2248 btrfs_update_inode(trans, root, inode);
d3c2fdcf 2249 nr = trans->blocks_used;
5f39d397 2250
39279cc3
CM		 2251 ret = btrfs_end_transaction(trans, root);
2252 BUG_ON(ret);
2253 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2254 btrfs_btree_balance_dirty(root, nr);
e2008b61 2255 btrfs_throttle(root);
39279cc3
CM		 2256}
2257
4313b399
CM		 2258static int noinline create_subvol(struct btrfs_root *root, char *name,
2259 int namelen)
39279cc3
CM		 2260{
2261 struct btrfs_trans_handle *trans;
2262 struct btrfs_key key;
2263 struct btrfs_root_item root_item;
2264 struct btrfs_inode_item *inode_item;
5f39d397 2265 struct extent_buffer *leaf;
dc17ff8f 2266 struct btrfs_root *new_root = root;
39279cc3
CM		 2267 struct inode *inode;
2268 struct inode *dir;
2269 int ret;
54aa1f4d 2270 int err;
39279cc3
CM		 2271 u64 objectid;
2272 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
d3c2fdcf 2273 unsigned long nr = 1;
39279cc3
CM		 2274
2275 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2276 ret = btrfs_check_free_space(root, 1, 0);
2277 if (ret)
2278 goto fail_commit;
2279
39279cc3
CM		 2280 trans = btrfs_start_transaction(root, 1);
2281 BUG_ON(!trans);
2282
7bb86316
CM		 2283 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2284 0, &objectid);
2285 if (ret)
2286 goto fail;
2287
2288 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2289 objectid, trans->transid, 0, 0,
2290 0, 0);
5f39d397
CM		 2291 if (IS_ERR(leaf))
2292 return PTR_ERR(leaf);
2293
2294 btrfs_set_header_nritems(leaf, 0);
2295 btrfs_set_header_level(leaf, 0);
db94535d 2296 btrfs_set_header_bytenr(leaf, leaf->start);
5f39d397 2297 btrfs_set_header_generation(leaf, trans->transid);
7bb86316
CM		 2298 btrfs_set_header_owner(leaf, objectid);
2299
5f39d397
CM		 2300 write_extent_buffer(leaf, root->fs_info->fsid,
2301 (unsigned long)btrfs_header_fsid(leaf),
2302 BTRFS_FSID_SIZE);
2303 btrfs_mark_buffer_dirty(leaf);
39279cc3
CM		 2304
2305 inode_item = &root_item.inode;
2306 memset(inode_item, 0, sizeof(*inode_item));
5f39d397
CM		 2307 inode_item->generation = cpu_to_le64(1);
2308 inode_item->size = cpu_to_le64(3);
2309 inode_item->nlink = cpu_to_le32(1);
2310 inode_item->nblocks = cpu_to_le64(1);
2311 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
39279cc3 2312
db94535d
CM		 2313 btrfs_set_root_bytenr(&root_item, leaf->start);
2314 btrfs_set_root_level(&root_item, 0);
39279cc3 2315 btrfs_set_root_refs(&root_item, 1);
5f39d397
CM		 2316 btrfs_set_root_used(&root_item, 0);
2317
5eda7b5e
CM		 2318 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2319 root_item.drop_level = 0;
5f39d397
CM		 2320
2321 free_extent_buffer(leaf);
2322 leaf = NULL;
39279cc3 2323
39279cc3
CM		 2324 btrfs_set_root_dirid(&root_item, new_dirid);
2325
2326 key.objectid = objectid;
2327 key.offset = 1;
39279cc3
CM		 2328 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2329 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2330 &root_item);
54aa1f4d
CM		 2331 if (ret)
2332 goto fail;
39279cc3
CM		 2333
2334 /*
2335 * insert the directory item
2336 */
2337 key.offset = (u64)-1;
2338 dir = root->fs_info->sb->s_root->d_inode;
2339 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2340 name, namelen, dir->i_ino, &key,
2341 BTRFS_FT_DIR);
54aa1f4d
CM		 2342 if (ret)
2343 goto fail;
39279cc3 2344
3954401f
CM		 2345 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2346 name, namelen, objectid,
2347 root->fs_info->sb->s_root->d_inode->i_ino);
2348 if (ret)
2349 goto fail;
2350
39279cc3 2351 ret = btrfs_commit_transaction(trans, root);
54aa1f4d
CM		 2352 if (ret)
2353 goto fail_commit;
39279cc3 2354
58176a96 2355 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
39279cc3
CM		 2356 BUG_ON(!new_root);
2357
2358 trans = btrfs_start_transaction(new_root, 1);
2359 BUG_ON(!trans);
2360
9c58309d
CM		 2361 inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid,
2362 new_dirid,
39279cc3 2363 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
54aa1f4d
CM		 2364 if (IS_ERR(inode))
2365 goto fail;
39279cc3
CM		 2366 inode->i_op = &btrfs_dir_inode_operations;
2367 inode->i_fop = &btrfs_dir_file_operations;
34088780 2368 new_root->inode = inode;
39279cc3 2369
3954401f
CM		 2370 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2371 new_dirid);
39279cc3 2372 inode->i_nlink = 1;
3954401f 2373 inode->i_size = 0;
39279cc3 2374 ret = btrfs_update_inode(trans, new_root, inode);
54aa1f4d
CM		 2375 if (ret)
2376 goto fail;
2377fail:
d3c2fdcf 2378 nr = trans->blocks_used;
dc17ff8f 2379 err = btrfs_commit_transaction(trans, new_root);
54aa1f4d
CM		 2380 if (err && !ret)
2381 ret = err;
2382fail_commit:
39279cc3 2383 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2384 btrfs_btree_balance_dirty(root, nr);
e2008b61 2385 btrfs_throttle(root);
54aa1f4d 2386 return ret;
39279cc3
CM		 2387}
2388
2389static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2390{
3063d29f 2391 struct btrfs_pending_snapshot *pending_snapshot;
39279cc3 2392 struct btrfs_trans_handle *trans;
39279cc3 2393 int ret;
54aa1f4d 2394 int err;
1832a6d5 2395 unsigned long nr = 0;
39279cc3
CM		 2396
2397 if (!root->ref_cows)
2398 return -EINVAL;
2399
2400 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2401 ret = btrfs_check_free_space(root, 1, 0);
2402 if (ret)
2403 goto fail_unlock;
2404
3063d29f
CM		 2405 pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
2406 if (!pending_snapshot) {
2407 ret = -ENOMEM;
2408 goto fail_unlock;
2409 }
fb4bc1e0 2410 pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
3063d29f
CM		 2411 if (!pending_snapshot->name) {
2412 ret = -ENOMEM;
2413 kfree(pending_snapshot);
2414 goto fail_unlock;
2415 }
fb4bc1e0
Y		 2416 memcpy(pending_snapshot->name, name, namelen);
2417 pending_snapshot->name[namelen] = '\0';
39279cc3
CM		 2418 trans = btrfs_start_transaction(root, 1);
2419 BUG_ON(!trans);
3063d29f
CM		 2420 pending_snapshot->root = root;
2421 list_add(&pending_snapshot->list,
2422 &trans->transaction->pending_snapshots);
39279cc3 2423 ret = btrfs_update_inode(trans, root, root->inode);
54aa1f4d 2424 err = btrfs_commit_transaction(trans, root);
5f39d397 2425
1832a6d5 2426fail_unlock:
39279cc3 2427 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2428 btrfs_btree_balance_dirty(root, nr);
e2008b61 2429 btrfs_throttle(root);
54aa1f4d 2430 return ret;
39279cc3
CM		 2431}
2432
edbd8d4e 2433unsigned long btrfs_force_ra(struct address_space *mapping,
86479a04
CM		 2434 struct file_ra_state *ra, struct file *file,
2435 pgoff_t offset, pgoff_t last_index)
2436{
2437 pgoff_t req_size;
2438
2439#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2440 req_size = last_index - offset + 1;
2441 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2442 return offset;
2443#else
2444 req_size = min(last_index - offset + 1, (pgoff_t)128);
2445 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2446 return offset + req_size;
2447#endif
2448}
2449
2450int btrfs_defrag_file(struct file *file) {
6da6abae 2451 struct inode *inode = fdentry(file)->d_inode;
1832a6d5 2452 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 2453 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
86479a04
CM		 2454 struct page *page;
2455 unsigned long last_index;
2456 unsigned long ra_index = 0;
2457 u64 page_start;
2458 u64 page_end;
2459 unsigned long i;
1832a6d5
CM		 2460 int ret;
2461
2462 mutex_lock(&root->fs_info->fs_mutex);
2463 ret = btrfs_check_free_space(root, inode->i_size, 0);
2464 mutex_unlock(&root->fs_info->fs_mutex);
2465 if (ret)
2466 return -ENOSPC;
86479a04
CM		 2467
2468 mutex_lock(&inode->i_mutex);
2469 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2470 for (i = 0; i <= last_index; i++) {
2471 if (i == ra_index) {
edbd8d4e
CM		 2472 ra_index = btrfs_force_ra(inode->i_mapping,
2473 &file->f_ra,
2474 file, ra_index, last_index);
86479a04
CM		 2475 }
2476 page = grab_cache_page(inode->i_mapping, i);
2477 if (!page)
2478 goto out_unlock;
2479 if (!PageUptodate(page)) {
2480 btrfs_readpage(NULL, page);
2481 lock_page(page);
2482 if (!PageUptodate(page)) {
2483 unlock_page(page);
2484 page_cache_release(page);
2485 goto out_unlock;
2486 }
2487 }
35ebb934 2488 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
86479a04
CM		 2489 page_end = page_start + PAGE_CACHE_SIZE - 1;
2490
d1310b2e 2491 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
d1310b2e 2492 set_extent_delalloc(io_tree, page_start,
86479a04 2493 page_end, GFP_NOFS);
edbd8d4e 2494
d1310b2e 2495 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
86479a04
CM		 2496 set_page_dirty(page);
2497 unlock_page(page);
2498 page_cache_release(page);
2499 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2500 }
2501
2502out_unlock:
2503 mutex_unlock(&inode->i_mutex);
2504 return 0;
2505}
2506
edbd8d4e
CM		 2507static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
2508{
2509 u64 new_size;
2510 u64 old_size;
2511 struct btrfs_ioctl_vol_args *vol_args;
2512 struct btrfs_trans_handle *trans;
2513 char *sizestr;
2514 int ret = 0;
2515 int namelen;
2516 int mod = 0;
2517
2518 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2519
2520 if (!vol_args)
2521 return -ENOMEM;
2522
2523 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2524 ret = -EFAULT;
2525 goto out;
2526 }
2527 namelen = strlen(vol_args->name);
2528 if (namelen > BTRFS_VOL_NAME_MAX) {
2529 ret = -EINVAL;
2530 goto out;
2531 }
2532
2533 sizestr = vol_args->name;
2534 if (!strcmp(sizestr, "max"))
2535 new_size = root->fs_info->sb->s_bdev->bd_inode->i_size;
2536 else {
2537 if (sizestr[0] == '-') {
2538 mod = -1;
2539 sizestr++;
2540 } else if (sizestr[0] == '+') {
2541 mod = 1;
2542 sizestr++;
2543 }
2544 new_size = btrfs_parse_size(sizestr);
2545 if (new_size == 0) {
2546 ret = -EINVAL;
2547 goto out;
2548 }
2549 }
2550
2551 mutex_lock(&root->fs_info->fs_mutex);
2552 old_size = btrfs_super_total_bytes(&root->fs_info->super_copy);
2553
2554 if (mod < 0) {
2555 if (new_size > old_size) {
2556 ret = -EINVAL;
2557 goto out_unlock;
2558 }
2559 new_size = old_size - new_size;
2560 } else if (mod > 0) {
2561 new_size = old_size + new_size;
2562 }
2563
2564 if (new_size < 256 * 1024 * 1024) {
2565 ret = -EINVAL;
2566 goto out_unlock;
2567 }
2568 if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) {
2569 ret = -EFBIG;
2570 goto out_unlock;
2571 }
f9ef6604
CM		 2572
2573 do_div(new_size, root->sectorsize);
2574 new_size *= root->sectorsize;
edbd8d4e
CM		 2575
2576printk("new size is %Lu\n", new_size);
2577 if (new_size > old_size) {
2578 trans = btrfs_start_transaction(root, 1);
2579 ret = btrfs_grow_extent_tree(trans, root, new_size);
2580 btrfs_commit_transaction(trans, root);
2581 } else {
2582 ret = btrfs_shrink_extent_tree(root, new_size);
2583 }
2584
2585out_unlock:
2586 mutex_unlock(&root->fs_info->fs_mutex);
2587out:
2588 kfree(vol_args);
2589 return ret;
2590}
2591
4313b399
CM		 2592static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root,
2593 void __user *arg)
39279cc3 2594{
4aec2b52 2595 struct btrfs_ioctl_vol_args *vol_args;
39279cc3 2596 struct btrfs_dir_item *di;
39279cc3
CM		 2597 struct btrfs_path *path;
2598 u64 root_dirid;
4aec2b52
CM		 2599 int namelen;
2600 int ret;
39279cc3 2601
4aec2b52 2602 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
5f39d397 2603
4aec2b52
CM		 2604 if (!vol_args)
2605 return -ENOMEM;
2606
2607 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2608 ret = -EFAULT;
2609 goto out;
2610 }
2611
2612 namelen = strlen(vol_args->name);
2613 if (namelen > BTRFS_VOL_NAME_MAX) {
2614 ret = -EINVAL;
2615 goto out;
2616 }
2617 if (strchr(vol_args->name, '/')) {
2618 ret = -EINVAL;
2619 goto out;
2620 }
d03581f4
CH		 2621
2622 path = btrfs_alloc_path();
4aec2b52
CM		 2623 if (!path) {
2624 ret = -ENOMEM;
2625 goto out;
2626 }
d03581f4
CH		 2627
2628 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2629 mutex_lock(&root->fs_info->fs_mutex);
2630 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2631 path, root_dirid,
4aec2b52 2632 vol_args->name, namelen, 0);
d03581f4
CH		 2633 mutex_unlock(&root->fs_info->fs_mutex);
2634 btrfs_free_path(path);
4aec2b52
CM		 2635
2636 if (di && !IS_ERR(di)) {
2637 ret = -EEXIST;
2638 goto out;
2639 }
2640
2641 if (IS_ERR(di)) {
2642 ret = PTR_ERR(di);
2643 goto out;
2644 }
d03581f4
CH		 2645
2646 if (root == root->fs_info->tree_root)
4aec2b52
CM		 2647 ret = create_subvol(root, vol_args->name, namelen);
2648 else
2649 ret = create_snapshot(root, vol_args->name, namelen);
2650out:
2651 kfree(vol_args);
2652 return ret;
d03581f4
CH		 2653}
2654
2655static int btrfs_ioctl_defrag(struct file *file)
2656{
6da6abae 2657 struct inode *inode = fdentry(file)->d_inode;
d03581f4
CH		 2658 struct btrfs_root *root = BTRFS_I(inode)->root;
2659
2660 switch (inode->i_mode & S_IFMT) {
2661 case S_IFDIR:
39279cc3 2662 mutex_lock(&root->fs_info->fs_mutex);
d03581f4
CH		 2663 btrfs_defrag_root(root, 0);
2664 btrfs_defrag_root(root->fs_info->extent_root, 0);
39279cc3 2665 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3 2666 break;
d03581f4
CH		 2667 case S_IFREG:
2668 btrfs_defrag_file(file);
2669 break;
2670 }
2671
2672 return 0;
2673}
6702ed49 2674
d03581f4
CH		 2675long btrfs_ioctl(struct file *file, unsigned int
2676 cmd, unsigned long arg)
2677{
6da6abae 2678 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
d03581f4
CH		 2679
2680 switch (cmd) {
2681 case BTRFS_IOC_SNAP_CREATE:
2682 return btrfs_ioctl_snap_create(root, (void __user *)arg);
6702ed49 2683 case BTRFS_IOC_DEFRAG:
d03581f4 2684 return btrfs_ioctl_defrag(file);
edbd8d4e
CM		 2685 case BTRFS_IOC_RESIZE:
2686 return btrfs_ioctl_resize(root, (void __user *)arg);
39279cc3 2687 }
d03581f4
CH		 2688
2689 return -ENOTTY;
39279cc3
CM		 2690}
2691
39279cc3
CM		 2692/*
2693 * Called inside transaction, so use GFP_NOFS
2694 */
2695struct inode *btrfs_alloc_inode(struct super_block *sb)
2696{
2697 struct btrfs_inode *ei;
2698
2699 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2700 if (!ei)
2701 return NULL;
15ee9bc7 2702 ei->last_trans = 0;
dc17ff8f 2703 ei->ordered_trans = 0;
39279cc3
CM		 2704 return &ei->vfs_inode;
2705}
2706
2707void btrfs_destroy_inode(struct inode *inode)
2708{
2709 WARN_ON(!list_empty(&inode->i_dentry));
2710 WARN_ON(inode->i_data.nrpages);
2711
8c416c9e 2712 btrfs_drop_extent_cache(inode, 0, (u64)-1);
39279cc3
CM		 2713 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2714}
2715
44ec0b71
CM		 2716#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2717static void init_once(struct kmem_cache * cachep, void *foo)
2718#else
39279cc3
CM		 2719static void init_once(void * foo, struct kmem_cache * cachep,
2720 unsigned long flags)
44ec0b71 2721#endif
39279cc3
CM		 2722{
2723 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2724
2725 inode_init_once(&ei->vfs_inode);
2726}
2727
2728void btrfs_destroy_cachep(void)
2729{
2730 if (btrfs_inode_cachep)
2731 kmem_cache_destroy(btrfs_inode_cachep);
2732 if (btrfs_trans_handle_cachep)
2733 kmem_cache_destroy(btrfs_trans_handle_cachep);
2734 if (btrfs_transaction_cachep)
2735 kmem_cache_destroy(btrfs_transaction_cachep);
2736 if (btrfs_bit_radix_cachep)
2737 kmem_cache_destroy(btrfs_bit_radix_cachep);
2738 if (btrfs_path_cachep)
2739 kmem_cache_destroy(btrfs_path_cachep);
2740}
2741
86479a04 2742struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
92fee66d 2743 unsigned long extra_flags,
44ec0b71
CM		 2744#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2745 void (*ctor)(struct kmem_cache *, void *)
2746#else
92fee66d 2747 void (*ctor)(void *, struct kmem_cache *,
44ec0b71
CM		 2748 unsigned long)
2749#endif
2750 )
92fee66d
CM		 2751{
2752 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
2753 SLAB_MEM_SPREAD | extra_flags), ctor
2754#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2755 ,NULL
2756#endif
2757 );
2758}
2759
39279cc3
CM		 2760int btrfs_init_cachep(void)
2761{
86479a04 2762 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
92fee66d
CM		 2763 sizeof(struct btrfs_inode),
2764 0, init_once);
39279cc3
CM		 2765 if (!btrfs_inode_cachep)
2766 goto fail;
86479a04
CM		 2767 btrfs_trans_handle_cachep =
2768 btrfs_cache_create("btrfs_trans_handle_cache",
2769 sizeof(struct btrfs_trans_handle),
2770 0, NULL);
39279cc3
CM		 2771 if (!btrfs_trans_handle_cachep)
2772 goto fail;
86479a04 2773 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
39279cc3 2774 sizeof(struct btrfs_transaction),
92fee66d 2775 0, NULL);
39279cc3
CM		 2776 if (!btrfs_transaction_cachep)
2777 goto fail;
86479a04 2778 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
23223584 2779 sizeof(struct btrfs_path),
92fee66d 2780 0, NULL);
39279cc3
CM		 2781 if (!btrfs_path_cachep)
2782 goto fail;
86479a04 2783 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
92fee66d 2784 SLAB_DESTROY_BY_RCU, NULL);
39279cc3
CM		 2785 if (!btrfs_bit_radix_cachep)
2786 goto fail;
2787 return 0;
2788fail:
2789 btrfs_destroy_cachep();
2790 return -ENOMEM;
2791}
2792
2793static int btrfs_getattr(struct vfsmount *mnt,
2794 struct dentry *dentry, struct kstat *stat)
2795{
2796 struct inode *inode = dentry->d_inode;
2797 generic_fillattr(inode, stat);
d6667462 2798 stat->blksize = PAGE_CACHE_SIZE;
39279cc3
CM		 2799 return 0;
2800}
2801
2802static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
2803 struct inode * new_dir,struct dentry *new_dentry)
2804{
2805 struct btrfs_trans_handle *trans;
2806 struct btrfs_root *root = BTRFS_I(old_dir)->root;
2807 struct inode *new_inode = new_dentry->d_inode;
2808 struct inode *old_inode = old_dentry->d_inode;
2809 struct timespec ctime = CURRENT_TIME;
2810 struct btrfs_path *path;
39279cc3
CM		 2811 int ret;
2812
2813 if (S_ISDIR(old_inode->i_mode) && new_inode &&
2814 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
2815 return -ENOTEMPTY;
2816 }
5f39d397 2817
39279cc3 2818 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2819 ret = btrfs_check_free_space(root, 1, 0);
2820 if (ret)
2821 goto out_unlock;
2822
39279cc3 2823 trans = btrfs_start_transaction(root, 1);
5f39d397 2824
39279cc3
CM		 2825 btrfs_set_trans_block_group(trans, new_dir);
2826 path = btrfs_alloc_path();
2827 if (!path) {
2828 ret = -ENOMEM;
2829 goto out_fail;
2830 }
2831
2832 old_dentry->d_inode->i_nlink++;
2833 old_dir->i_ctime = old_dir->i_mtime = ctime;
2834 new_dir->i_ctime = new_dir->i_mtime = ctime;
2835 old_inode->i_ctime = ctime;
5f39d397 2836
39279cc3
CM		 2837 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
2838 if (ret)
2839 goto out_fail;
2840
2841 if (new_inode) {
2842 new_inode->i_ctime = CURRENT_TIME;
2843 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
2844 if (ret)
2845 goto out_fail;
39279cc3 2846 }
9c58309d 2847 ret = btrfs_add_link(trans, new_dentry, old_inode, 1);
39279cc3
CM		 2848 if (ret)
2849 goto out_fail;
2850
2851out_fail:
2852 btrfs_free_path(path);
2853 btrfs_end_transaction(trans, root);
1832a6d5 2854out_unlock:
39279cc3
CM		 2855 mutex_unlock(&root->fs_info->fs_mutex);
2856 return ret;
2857}
2858
2859static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
2860 const char *symname)
2861{
2862 struct btrfs_trans_handle *trans;
2863 struct btrfs_root *root = BTRFS_I(dir)->root;
2864 struct btrfs_path *path;
2865 struct btrfs_key key;
1832a6d5 2866 struct inode *inode = NULL;
39279cc3
CM		 2867 int err;
2868 int drop_inode = 0;
2869 u64 objectid;
2870 int name_len;
2871 int datasize;
5f39d397 2872 unsigned long ptr;
39279cc3 2873 struct btrfs_file_extent_item *ei;
5f39d397 2874 struct extent_buffer *leaf;
1832a6d5 2875 unsigned long nr = 0;
39279cc3
CM		 2876
2877 name_len = strlen(symname) + 1;
2878 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
2879 return -ENAMETOOLONG;
1832a6d5 2880
39279cc3 2881 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2882 err = btrfs_check_free_space(root, 1, 0);
2883 if (err)
2884 goto out_fail;
2885
39279cc3
CM		 2886 trans = btrfs_start_transaction(root, 1);
2887 btrfs_set_trans_block_group(trans, dir);
2888
2889 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2890 if (err) {
2891 err = -ENOSPC;
2892 goto out_unlock;
2893 }
2894
9c58309d
CM		 2895 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
2896 dentry->d_name.len,
2897 dentry->d_parent->d_inode->i_ino, objectid,
39279cc3
CM		 2898 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
2899 err = PTR_ERR(inode);
2900 if (IS_ERR(inode))
2901 goto out_unlock;
2902
2903 btrfs_set_trans_block_group(trans, inode);
9c58309d 2904 err = btrfs_add_nondir(trans, dentry, inode, 0);
39279cc3
CM		 2905 if (err)
2906 drop_inode = 1;
2907 else {
2908 inode->i_mapping->a_ops = &btrfs_aops;
2909 inode->i_fop = &btrfs_file_operations;
2910 inode->i_op = &btrfs_file_inode_operations;
d1310b2e
CM		 2911 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
2912 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
a52d9a80 2913 inode->i_mapping, GFP_NOFS);
d1310b2e 2914 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 2915 }
2916 dir->i_sb->s_dirt = 1;
2917 btrfs_update_inode_block_group(trans, inode);
2918 btrfs_update_inode_block_group(trans, dir);
2919 if (drop_inode)
2920 goto out_unlock;
2921
2922 path = btrfs_alloc_path();
2923 BUG_ON(!path);
2924 key.objectid = inode->i_ino;
2925 key.offset = 0;
39279cc3
CM		 2926 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2927 datasize = btrfs_file_extent_calc_inline_size(name_len);
2928 err = btrfs_insert_empty_item(trans, root, path, &key,
2929 datasize);
54aa1f4d
CM		 2930 if (err) {
2931 drop_inode = 1;
2932 goto out_unlock;
2933 }
5f39d397
CM		 2934 leaf = path->nodes[0];
2935 ei = btrfs_item_ptr(leaf, path->slots[0],
2936 struct btrfs_file_extent_item);
2937 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
2938 btrfs_set_file_extent_type(leaf, ei,
39279cc3
CM		 2939 BTRFS_FILE_EXTENT_INLINE);
2940 ptr = btrfs_file_extent_inline_start(ei);
5f39d397
CM		 2941 write_extent_buffer(leaf, symname, ptr, name_len);
2942 btrfs_mark_buffer_dirty(leaf);
39279cc3 2943 btrfs_free_path(path);
5f39d397 2944
39279cc3
CM		 2945 inode->i_op = &btrfs_symlink_inode_operations;
2946 inode->i_mapping->a_ops = &btrfs_symlink_aops;
2947 inode->i_size = name_len - 1;
54aa1f4d
CM		 2948 err = btrfs_update_inode(trans, root, inode);
2949 if (err)
2950 drop_inode = 1;
39279cc3
CM		 2951
2952out_unlock:
d3c2fdcf 2953 nr = trans->blocks_used;
39279cc3 2954 btrfs_end_transaction(trans, root);
1832a6d5 2955out_fail:
39279cc3 2956 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 2957 if (drop_inode) {
2958 inode_dec_link_count(inode);
2959 iput(inode);
2960 }
d3c2fdcf 2961 btrfs_btree_balance_dirty(root, nr);
e2008b61 2962 btrfs_throttle(root);
39279cc3
CM		 2963 return err;
2964}
fdebe2bd
Y		 2965static int btrfs_permission(struct inode *inode, int mask,
2966 struct nameidata *nd)
2967{
2968 if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
2969 return -EACCES;
2970 return generic_permission(inode, mask, NULL);
2971}
39279cc3
CM		 2972
2973static struct inode_operations btrfs_dir_inode_operations = {
2974 .lookup = btrfs_lookup,
2975 .create = btrfs_create,
2976 .unlink = btrfs_unlink,
2977 .link = btrfs_link,
2978 .mkdir = btrfs_mkdir,
2979 .rmdir = btrfs_rmdir,
2980 .rename = btrfs_rename,
2981 .symlink = btrfs_symlink,
2982 .setattr = btrfs_setattr,
618e21d5 2983 .mknod = btrfs_mknod,
5103e947
JB		 2984 .setxattr = generic_setxattr,
2985 .getxattr = generic_getxattr,
2986 .listxattr = btrfs_listxattr,
2987 .removexattr = generic_removexattr,
fdebe2bd 2988 .permission = btrfs_permission,
39279cc3 2989};
39279cc3
CM		 2990static struct inode_operations btrfs_dir_ro_inode_operations = {
2991 .lookup = btrfs_lookup,
fdebe2bd 2992 .permission = btrfs_permission,
39279cc3 2993};
39279cc3
CM		 2994static struct file_operations btrfs_dir_file_operations = {
2995 .llseek = generic_file_llseek,
2996 .read = generic_read_dir,
2997 .readdir = btrfs_readdir,
34287aa3 2998 .unlocked_ioctl = btrfs_ioctl,
39279cc3 2999#ifdef CONFIG_COMPAT
34287aa3 3000 .compat_ioctl = btrfs_ioctl,
39279cc3
CM		 3001#endif
3002};
3003
d1310b2e 3004static struct extent_io_ops btrfs_extent_io_ops = {
07157aac
CM		 3005 .fill_delalloc = run_delalloc_range,
3006 .writepage_io_hook = btrfs_writepage_io_hook,
3007 .readpage_io_hook = btrfs_readpage_io_hook,
3008 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
3009};
3010
39279cc3
CM		 3011static struct address_space_operations btrfs_aops = {
3012 .readpage = btrfs_readpage,
3013 .writepage = btrfs_writepage,
b293f02e 3014 .writepages = btrfs_writepages,
3ab2fb5a 3015 .readpages = btrfs_readpages,
39279cc3 3016 .sync_page = block_sync_page,
39279cc3 3017 .bmap = btrfs_bmap,
a52d9a80
CM		 3018 .invalidatepage = btrfs_invalidatepage,
3019 .releasepage = btrfs_releasepage,
3020 .set_page_dirty = __set_page_dirty_nobuffers,
39279cc3
CM		 3021};
3022
3023static struct address_space_operations btrfs_symlink_aops = {
3024 .readpage = btrfs_readpage,
3025 .writepage = btrfs_writepage,
2bf5a725
CM		 3026 .invalidatepage = btrfs_invalidatepage,
3027 .releasepage = btrfs_releasepage,
39279cc3
CM		 3028};
3029
3030static struct inode_operations btrfs_file_inode_operations = {
3031 .truncate = btrfs_truncate,
3032 .getattr = btrfs_getattr,
3033 .setattr = btrfs_setattr,
5103e947
JB		 3034 .setxattr = generic_setxattr,
3035 .getxattr = generic_getxattr,
3036 .listxattr = btrfs_listxattr,
3037 .removexattr = generic_removexattr,
fdebe2bd 3038 .permission = btrfs_permission,
39279cc3 3039};
618e21d5
JB		 3040static struct inode_operations btrfs_special_inode_operations = {
3041 .getattr = btrfs_getattr,
3042 .setattr = btrfs_setattr,
fdebe2bd 3043 .permission = btrfs_permission,
618e21d5 3044};
39279cc3
CM		 3045static struct inode_operations btrfs_symlink_inode_operations = {
3046 .readlink = generic_readlink,
3047 .follow_link = page_follow_link_light,
3048 .put_link = page_put_link,
fdebe2bd 3049 .permission = btrfs_permission,
39279cc3 3050};
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