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Btrfs: Create larger bios for btree blocks
[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 262int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
b0c68f8b 263 unsigned long old, unsigned long bits)
291d673e 264{
b0c68f8b 265 if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
291d673e
CM		 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,
b0c68f8b 275 unsigned long old, unsigned long bits)
291d673e 276{
b0c68f8b 277 if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
291d673e
CM		 278 struct btrfs_root *root = BTRFS_I(inode)->root;
279 spin_lock(&root->fs_info->delalloc_lock);
b0c68f8b
CM		 280 if (end - start + 1 > root->fs_info->delalloc_bytes) {
281 printk("warning: delalloc account %Lu %Lu\n",
282 end - start + 1, root->fs_info->delalloc_bytes);
283 root->fs_info->delalloc_bytes = 0;
284 } else {
285 root->fs_info->delalloc_bytes -= end - start + 1;
286 }
291d673e
CM		 287 spin_unlock(&root->fs_info->delalloc_lock);
288 }
289 return 0;
290}
291
07157aac
CM		 292int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end)
293{
294 struct inode *inode = page->mapping->host;
295 struct btrfs_root *root = BTRFS_I(inode)->root;
296 struct btrfs_trans_handle *trans;
297 char *kaddr;
b6cda9bc 298 int ret = 0;
35ebb934 299 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
07157aac 300 size_t offset = start - page_start;
b98b6767
Y		 301 if (btrfs_test_opt(root, NODATASUM) ||
302 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 303 return 0;
07157aac
CM		 304 mutex_lock(&root->fs_info->fs_mutex);
305 trans = btrfs_start_transaction(root, 1);
306 btrfs_set_trans_block_group(trans, inode);
307 kaddr = kmap(page);
f578d4bd 308 btrfs_csum_file_block(trans, root, inode, inode->i_ino,
07157aac
CM		 309 start, kaddr + offset, end - start + 1);
310 kunmap(page);
311 ret = btrfs_end_transaction(trans, root);
312 BUG_ON(ret);
313 mutex_unlock(&root->fs_info->fs_mutex);
314 return ret;
315}
316
317int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
318{
319 int ret = 0;
320 struct inode *inode = page->mapping->host;
321 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 322 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
07157aac
CM		 323 struct btrfs_csum_item *item;
324 struct btrfs_path *path = NULL;
ff79f819 325 u32 csum;
b98b6767
Y		 326 if (btrfs_test_opt(root, NODATASUM) ||
327 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 328 return 0;
07157aac
CM		 329 mutex_lock(&root->fs_info->fs_mutex);
330 path = btrfs_alloc_path();
331 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
332 if (IS_ERR(item)) {
333 ret = PTR_ERR(item);
334 /* a csum that isn't present is a preallocated region. */
335 if (ret == -ENOENT || ret == -EFBIG)
336 ret = 0;
ff79f819 337 csum = 0;
aadfeb6e 338 printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start);
07157aac
CM		 339 goto out;
340 }
ff79f819
CM		 341 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
342 BTRFS_CRC32_SIZE);
d1310b2e 343 set_state_private(io_tree, start, csum);
07157aac
CM		 344out:
345 if (path)
346 btrfs_free_path(path);
347 mutex_unlock(&root->fs_info->fs_mutex);
348 return ret;
349}
350
70dec807
CM		 351int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end,
352 struct extent_state *state)
07157aac 353{
35ebb934 354 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
07157aac 355 struct inode *inode = page->mapping->host;
d1310b2e 356 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
07157aac 357 char *kaddr;
aadfeb6e 358 u64 private = ~(u32)0;
07157aac 359 int ret;
ff79f819
CM		 360 struct btrfs_root *root = BTRFS_I(inode)->root;
361 u32 csum = ~(u32)0;
bbf0d006 362 unsigned long flags;
d1310b2e 363
b98b6767
Y		 364 if (btrfs_test_opt(root, NODATASUM) ||
365 btrfs_test_flag(inode, NODATASUM))
b6cda9bc 366 return 0;
c2e639f0 367 if (state && state->start == start) {
70dec807
CM		 368 private = state->private;
369 ret = 0;
370 } else {
371 ret = get_state_private(io_tree, start, &private);
372 }
bbf0d006 373 local_irq_save(flags);
07157aac
CM		 374 kaddr = kmap_atomic(page, KM_IRQ0);
375 if (ret) {
376 goto zeroit;
377 }
ff79f819
CM		 378 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
379 btrfs_csum_final(csum, (char *)&csum);
380 if (csum != private) {
07157aac
CM		 381 goto zeroit;
382 }
383 kunmap_atomic(kaddr, KM_IRQ0);
bbf0d006 384 local_irq_restore(flags);
07157aac
CM		 385 return 0;
386
387zeroit:
aadfeb6e
CM		 388 printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n",
389 page->mapping->host->i_ino, (unsigned long long)start, csum,
390 private);
db94535d
CM		 391 memset(kaddr + offset, 1, end - start + 1);
392 flush_dcache_page(page);
07157aac 393 kunmap_atomic(kaddr, KM_IRQ0);
bbf0d006 394 local_irq_restore(flags);
07157aac
CM		 395 return 0;
396}
b888db2b 397
39279cc3
CM		 398void btrfs_read_locked_inode(struct inode *inode)
399{
400 struct btrfs_path *path;
5f39d397 401 struct extent_buffer *leaf;
39279cc3 402 struct btrfs_inode_item *inode_item;
5f39d397 403 struct btrfs_inode_timespec *tspec;
39279cc3
CM		 404 struct btrfs_root *root = BTRFS_I(inode)->root;
405 struct btrfs_key location;
406 u64 alloc_group_block;
618e21d5 407 u32 rdev;
39279cc3
CM		 408 int ret;
409
410 path = btrfs_alloc_path();
411 BUG_ON(!path);
39279cc3 412 mutex_lock(&root->fs_info->fs_mutex);
39279cc3 413 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
dc17ff8f 414
39279cc3 415 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
5f39d397 416 if (ret)
39279cc3 417 goto make_bad;
39279cc3 418
5f39d397
CM		 419 leaf = path->nodes[0];
420 inode_item = btrfs_item_ptr(leaf, path->slots[0],
421 struct btrfs_inode_item);
422
423 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
424 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
425 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
426 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
427 inode->i_size = btrfs_inode_size(leaf, inode_item);
428
429 tspec = btrfs_inode_atime(inode_item);
430 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
431 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
432
433 tspec = btrfs_inode_mtime(inode_item);
434 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
435 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
436
437 tspec = btrfs_inode_ctime(inode_item);
438 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
439 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
440
441 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
442 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
618e21d5 443 inode->i_rdev = 0;
5f39d397
CM		 444 rdev = btrfs_inode_rdev(leaf, inode_item);
445
446 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
39279cc3
CM		 447 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
448 alloc_group_block);
b98b6767 449 BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
e52ec0eb
CM		 450 if (!BTRFS_I(inode)->block_group) {
451 BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
452 NULL, 0, 0, 0);
453 }
39279cc3
CM		 454 btrfs_free_path(path);
455 inode_item = NULL;
456
457 mutex_unlock(&root->fs_info->fs_mutex);
458
459 switch (inode->i_mode & S_IFMT) {
39279cc3
CM		 460 case S_IFREG:
461 inode->i_mapping->a_ops = &btrfs_aops;
d1310b2e 462 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 463 inode->i_fop = &btrfs_file_operations;
464 inode->i_op = &btrfs_file_inode_operations;
465 break;
466 case S_IFDIR:
467 inode->i_fop = &btrfs_dir_file_operations;
468 if (root == root->fs_info->tree_root)
469 inode->i_op = &btrfs_dir_ro_inode_operations;
470 else
471 inode->i_op = &btrfs_dir_inode_operations;
472 break;
473 case S_IFLNK:
474 inode->i_op = &btrfs_symlink_inode_operations;
475 inode->i_mapping->a_ops = &btrfs_symlink_aops;
476 break;
618e21d5
JB		 477 default:
478 init_special_inode(inode, inode->i_mode, rdev);
479 break;
39279cc3
CM		 480 }
481 return;
482
483make_bad:
484 btrfs_release_path(root, path);
485 btrfs_free_path(path);
486 mutex_unlock(&root->fs_info->fs_mutex);
487 make_bad_inode(inode);
488}
489
5f39d397
CM		 490static void fill_inode_item(struct extent_buffer *leaf,
491 struct btrfs_inode_item *item,
39279cc3
CM		 492 struct inode *inode)
493{
5f39d397
CM		 494 btrfs_set_inode_uid(leaf, item, inode->i_uid);
495 btrfs_set_inode_gid(leaf, item, inode->i_gid);
496 btrfs_set_inode_size(leaf, item, inode->i_size);
497 btrfs_set_inode_mode(leaf, item, inode->i_mode);
498 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
499
500 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
501 inode->i_atime.tv_sec);
502 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
503 inode->i_atime.tv_nsec);
504
505 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
506 inode->i_mtime.tv_sec);
507 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
508 inode->i_mtime.tv_nsec);
509
510 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
511 inode->i_ctime.tv_sec);
512 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
513 inode->i_ctime.tv_nsec);
514
515 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
516 btrfs_set_inode_generation(leaf, item, inode->i_generation);
517 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
b98b6767 518 btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
5f39d397 519 btrfs_set_inode_block_group(leaf, item,
39279cc3
CM		 520 BTRFS_I(inode)->block_group->key.objectid);
521}
522
a52d9a80 523int btrfs_update_inode(struct btrfs_trans_handle *trans,
39279cc3
CM		 524 struct btrfs_root *root,
525 struct inode *inode)
526{
527 struct btrfs_inode_item *inode_item;
528 struct btrfs_path *path;
5f39d397 529 struct extent_buffer *leaf;
39279cc3
CM		 530 int ret;
531
532 path = btrfs_alloc_path();
533 BUG_ON(!path);
39279cc3
CM		 534 ret = btrfs_lookup_inode(trans, root, path,
535 &BTRFS_I(inode)->location, 1);
536 if (ret) {
537 if (ret > 0)
538 ret = -ENOENT;
539 goto failed;
540 }
541
5f39d397
CM		 542 leaf = path->nodes[0];
543 inode_item = btrfs_item_ptr(leaf, path->slots[0],
39279cc3
CM		 544 struct btrfs_inode_item);
545
5f39d397
CM		 546 fill_inode_item(leaf, inode_item, inode);
547 btrfs_mark_buffer_dirty(leaf);
15ee9bc7 548 btrfs_set_inode_last_trans(trans, inode);
39279cc3
CM		 549 ret = 0;
550failed:
551 btrfs_release_path(root, path);
552 btrfs_free_path(path);
553 return ret;
554}
555
556
557static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
558 struct btrfs_root *root,
559 struct inode *dir,
560 struct dentry *dentry)
561{
562 struct btrfs_path *path;
563 const char *name = dentry->d_name.name;
564 int name_len = dentry->d_name.len;
565 int ret = 0;
5f39d397 566 struct extent_buffer *leaf;
39279cc3 567 struct btrfs_dir_item *di;
5f39d397 568 struct btrfs_key key;
39279cc3
CM		 569
570 path = btrfs_alloc_path();
54aa1f4d
CM		 571 if (!path) {
572 ret = -ENOMEM;
573 goto err;
574 }
575
39279cc3
CM		 576 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
577 name, name_len, -1);
578 if (IS_ERR(di)) {
579 ret = PTR_ERR(di);
580 goto err;
581 }
582 if (!di) {
583 ret = -ENOENT;
584 goto err;
585 }
5f39d397
CM		 586 leaf = path->nodes[0];
587 btrfs_dir_item_key_to_cpu(leaf, di, &key);
39279cc3 588 ret = btrfs_delete_one_dir_name(trans, root, path, di);
54aa1f4d
CM		 589 if (ret)
590 goto err;
39279cc3
CM		 591 btrfs_release_path(root, path);
592
593 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
5f39d397 594 key.objectid, name, name_len, -1);
39279cc3
CM		 595 if (IS_ERR(di)) {
596 ret = PTR_ERR(di);
597 goto err;
598 }
599 if (!di) {
600 ret = -ENOENT;
601 goto err;
602 }
603 ret = btrfs_delete_one_dir_name(trans, root, path, di);
39279cc3
CM		 604
605 dentry->d_inode->i_ctime = dir->i_ctime;
76fea00a
CM		 606 ret = btrfs_del_inode_ref(trans, root, name, name_len,
607 dentry->d_inode->i_ino,
608 dentry->d_parent->d_inode->i_ino);
609 if (ret) {
610 printk("failed to delete reference to %.*s, "
611 "inode %lu parent %lu\n", name_len, name,
612 dentry->d_inode->i_ino,
613 dentry->d_parent->d_inode->i_ino);
3954401f 614 }
39279cc3
CM		 615err:
616 btrfs_free_path(path);
617 if (!ret) {
618 dir->i_size -= name_len * 2;
79c44584 619 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
39279cc3 620 btrfs_update_inode(trans, root, dir);
6da6abae
CM		 621#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
622 dentry->d_inode->i_nlink--;
623#else
39279cc3 624 drop_nlink(dentry->d_inode);
6da6abae 625#endif
54aa1f4d 626 ret = btrfs_update_inode(trans, root, dentry->d_inode);
39279cc3
CM		 627 dir->i_sb->s_dirt = 1;
628 }
629 return ret;
630}
631
632static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
633{
634 struct btrfs_root *root;
635 struct btrfs_trans_handle *trans;
2da98f00 636 struct inode *inode = dentry->d_inode;
39279cc3 637 int ret;
1832a6d5 638 unsigned long nr = 0;
39279cc3
CM		 639
640 root = BTRFS_I(dir)->root;
641 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 642
643 ret = btrfs_check_free_space(root, 1, 1);
644 if (ret)
645 goto fail;
646
39279cc3 647 trans = btrfs_start_transaction(root, 1);
5f39d397 648
39279cc3
CM		 649 btrfs_set_trans_block_group(trans, dir);
650 ret = btrfs_unlink_trans(trans, root, dir, dentry);
d3c2fdcf 651 nr = trans->blocks_used;
5f39d397 652
2da98f00
CM		 653 if (inode->i_nlink == 0) {
654 int found;
655 /* if the inode isn't linked anywhere,
656 * we don't need to worry about
657 * data=ordered
658 */
659 found = btrfs_del_ordered_inode(inode);
660 if (found == 1) {
661 atomic_dec(&inode->i_count);
662 }
663 }
664
39279cc3 665 btrfs_end_transaction(trans, root);
1832a6d5 666fail:
39279cc3 667 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 668 btrfs_btree_balance_dirty(root, nr);
e2008b61 669 btrfs_throttle(root);
39279cc3
CM		 670 return ret;
671}
672
673static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
674{
675 struct inode *inode = dentry->d_inode;
1832a6d5 676 int err = 0;
39279cc3
CM		 677 int ret;
678 struct btrfs_root *root = BTRFS_I(dir)->root;
39279cc3 679 struct btrfs_trans_handle *trans;
1832a6d5 680 unsigned long nr = 0;
39279cc3 681
134d4512
Y		 682 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
683 return -ENOTEMPTY;
684
39279cc3 685 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 686 ret = btrfs_check_free_space(root, 1, 1);
687 if (ret)
688 goto fail;
689
39279cc3
CM		 690 trans = btrfs_start_transaction(root, 1);
691 btrfs_set_trans_block_group(trans, dir);
39279cc3
CM		 692
693 /* now the directory is empty */
694 err = btrfs_unlink_trans(trans, root, dir, dentry);
695 if (!err) {
696 inode->i_size = 0;
697 }
3954401f 698
d3c2fdcf 699 nr = trans->blocks_used;
39279cc3 700 ret = btrfs_end_transaction(trans, root);
1832a6d5 701fail:
134d4512 702 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 703 btrfs_btree_balance_dirty(root, nr);
e2008b61 704 btrfs_throttle(root);
3954401f 705
39279cc3
CM		 706 if (ret && !err)
707 err = ret;
708 return err;
709}
710
39279cc3
CM		 711/*
712 * this can truncate away extent items, csum items and directory items.
713 * It starts at a high offset and removes keys until it can't find
714 * any higher than i_size.
715 *
716 * csum items that cross the new i_size are truncated to the new size
717 * as well.
718 */
719static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
720 struct btrfs_root *root,
85e21bac
CM		 721 struct inode *inode,
722 u32 min_type)
39279cc3
CM		 723{
724 int ret;
725 struct btrfs_path *path;
726 struct btrfs_key key;
5f39d397 727 struct btrfs_key found_key;
39279cc3 728 u32 found_type;
5f39d397 729 struct extent_buffer *leaf;
39279cc3
CM		 730 struct btrfs_file_extent_item *fi;
731 u64 extent_start = 0;
db94535d 732 u64 extent_num_bytes = 0;
39279cc3 733 u64 item_end = 0;
7bb86316 734 u64 root_gen = 0;
d8d5f3e1 735 u64 root_owner = 0;
39279cc3
CM		 736 int found_extent;
737 int del_item;
85e21bac
CM		 738 int pending_del_nr = 0;
739 int pending_del_slot = 0;
179e29e4 740 int extent_type = -1;
39279cc3 741
a52d9a80 742 btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1);
39279cc3 743 path = btrfs_alloc_path();
3c69faec 744 path->reada = -1;
39279cc3 745 BUG_ON(!path);
5f39d397 746
39279cc3
CM		 747 /* FIXME, add redo link to tree so we don't leak on crash */
748 key.objectid = inode->i_ino;
749 key.offset = (u64)-1;
5f39d397
CM		 750 key.type = (u8)-1;
751
85e21bac
CM		 752 btrfs_init_path(path);
753search_again:
754 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
755 if (ret < 0) {
756 goto error;
757 }
758 if (ret > 0) {
759 BUG_ON(path->slots[0] == 0);
760 path->slots[0]--;
761 }
762
39279cc3 763 while(1) {
39279cc3 764 fi = NULL;
5f39d397
CM		 765 leaf = path->nodes[0];
766 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
767 found_type = btrfs_key_type(&found_key);
39279cc3 768
5f39d397 769 if (found_key.objectid != inode->i_ino)
39279cc3 770 break;
5f39d397 771
85e21bac 772 if (found_type < min_type)
39279cc3
CM		 773 break;
774
5f39d397 775 item_end = found_key.offset;
39279cc3 776 if (found_type == BTRFS_EXTENT_DATA_KEY) {
5f39d397 777 fi = btrfs_item_ptr(leaf, path->slots[0],
39279cc3 778 struct btrfs_file_extent_item);
179e29e4
CM		 779 extent_type = btrfs_file_extent_type(leaf, fi);
780 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
5f39d397 781 item_end +=
db94535d 782 btrfs_file_extent_num_bytes(leaf, fi);
179e29e4
CM		 783 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
784 struct btrfs_item *item = btrfs_item_nr(leaf,
785 path->slots[0]);
786 item_end += btrfs_file_extent_inline_len(leaf,
787 item);
39279cc3 788 }
008630c1 789 item_end--;
39279cc3
CM		 790 }
791 if (found_type == BTRFS_CSUM_ITEM_KEY) {
792 ret = btrfs_csum_truncate(trans, root, path,
793 inode->i_size);
794 BUG_ON(ret);
795 }
008630c1 796 if (item_end < inode->i_size) {
b888db2b
CM		 797 if (found_type == BTRFS_DIR_ITEM_KEY) {
798 found_type = BTRFS_INODE_ITEM_KEY;
799 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
800 found_type = BTRFS_CSUM_ITEM_KEY;
85e21bac
CM		 801 } else if (found_type == BTRFS_EXTENT_DATA_KEY) {
802 found_type = BTRFS_XATTR_ITEM_KEY;
803 } else if (found_type == BTRFS_XATTR_ITEM_KEY) {
804 found_type = BTRFS_INODE_REF_KEY;
b888db2b
CM		 805 } else if (found_type) {
806 found_type--;
807 } else {
808 break;
39279cc3 809 }
a61721d5 810 btrfs_set_key_type(&key, found_type);
85e21bac 811 goto next;
39279cc3 812 }
5f39d397 813 if (found_key.offset >= inode->i_size)
39279cc3
CM		 814 del_item = 1;
815 else
816 del_item = 0;
817 found_extent = 0;
818
819 /* FIXME, shrink the extent if the ref count is only 1 */
179e29e4
CM		 820 if (found_type != BTRFS_EXTENT_DATA_KEY)
821 goto delete;
822
823 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
39279cc3 824 u64 num_dec;
db94535d 825 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
39279cc3 826 if (!del_item) {
db94535d
CM		 827 u64 orig_num_bytes =
828 btrfs_file_extent_num_bytes(leaf, fi);
829 extent_num_bytes = inode->i_size -
5f39d397 830 found_key.offset + root->sectorsize - 1;
b1632b10
Y		 831 extent_num_bytes = extent_num_bytes &
832 ~((u64)root->sectorsize - 1);
db94535d
CM		 833 btrfs_set_file_extent_num_bytes(leaf, fi,
834 extent_num_bytes);
835 num_dec = (orig_num_bytes -
836 extent_num_bytes) >> 9;
bab9fb03
Y		 837 if (extent_start != 0) {
838 inode->i_blocks -= num_dec;
839 }
5f39d397 840 btrfs_mark_buffer_dirty(leaf);
39279cc3 841 } else {
db94535d
CM		 842 extent_num_bytes =
843 btrfs_file_extent_disk_num_bytes(leaf,
844 fi);
39279cc3 845 /* FIXME blocksize != 4096 */
db94535d
CM		 846 num_dec = btrfs_file_extent_num_bytes(leaf,
847 fi) >> 9;
39279cc3
CM		 848 if (extent_start != 0) {
849 found_extent = 1;
850 inode->i_blocks -= num_dec;
851 }
d8d5f3e1
CM		 852 root_gen = btrfs_header_generation(leaf);
853 root_owner = btrfs_header_owner(leaf);
39279cc3 854 }
179e29e4
CM		 855 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE &&
856 !del_item) {
857 u32 newsize = inode->i_size - found_key.offset;
858 newsize = btrfs_file_extent_calc_inline_size(newsize);
859 ret = btrfs_truncate_item(trans, root, path,
860 newsize, 1);
861 BUG_ON(ret);
39279cc3 862 }
179e29e4 863delete:
39279cc3 864 if (del_item) {
85e21bac
CM		 865 if (!pending_del_nr) {
866 /* no pending yet, add ourselves */
867 pending_del_slot = path->slots[0];
868 pending_del_nr = 1;
869 } else if (pending_del_nr &&
870 path->slots[0] + 1 == pending_del_slot) {
871 /* hop on the pending chunk */
872 pending_del_nr++;
873 pending_del_slot = path->slots[0];
874 } else {
875 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot);
876 }
39279cc3
CM		 877 } else {
878 break;
879 }
39279cc3
CM		 880 if (found_extent) {
881 ret = btrfs_free_extent(trans, root, extent_start,
7bb86316 882 extent_num_bytes,
d8d5f3e1 883 root_owner,
7bb86316
CM		 884 root_gen, inode->i_ino,
885 found_key.offset, 0);
39279cc3
CM		 886 BUG_ON(ret);
887 }
85e21bac
CM		 888next:
889 if (path->slots[0] == 0) {
890 if (pending_del_nr)
891 goto del_pending;
892 btrfs_release_path(root, path);
893 goto search_again;
894 }
895
896 path->slots[0]--;
897 if (pending_del_nr &&
898 path->slots[0] + 1 != pending_del_slot) {
899 struct btrfs_key debug;
900del_pending:
901 btrfs_item_key_to_cpu(path->nodes[0], &debug,
902 pending_del_slot);
903 ret = btrfs_del_items(trans, root, path,
904 pending_del_slot,
905 pending_del_nr);
906 BUG_ON(ret);
907 pending_del_nr = 0;
908 btrfs_release_path(root, path);
909 goto search_again;
910 }
39279cc3
CM		 911 }
912 ret = 0;
913error:
85e21bac
CM		 914 if (pending_del_nr) {
915 ret = btrfs_del_items(trans, root, path, pending_del_slot,
916 pending_del_nr);
917 }
39279cc3
CM		 918 btrfs_release_path(root, path);
919 btrfs_free_path(path);
920 inode->i_sb->s_dirt = 1;
921 return ret;
922}
923
b888db2b 924static int btrfs_cow_one_page(struct inode *inode, struct page *page,
a52d9a80
CM		 925 size_t zero_start)
926{
927 char *kaddr;
d1310b2e 928 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
35ebb934 929 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
b888db2b 930 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
1832a6d5 931 int ret = 0;
a52d9a80 932
190662b2 933 WARN_ON(!PageLocked(page));
b3cfa35a 934 set_page_extent_mapped(page);
a52d9a80 935
d1310b2e 936 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
d1310b2e 937 set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start,
b888db2b 938 page_end, GFP_NOFS);
1832a6d5 939
a52d9a80 940 if (zero_start != PAGE_CACHE_SIZE) {
b888db2b 941 kaddr = kmap(page);
a52d9a80
CM		 942 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
943 flush_dcache_page(page);
b888db2b 944 kunmap(page);
a52d9a80 945 }
b888db2b 946 set_page_dirty(page);
d1310b2e 947 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
a52d9a80 948
a52d9a80
CM		 949 return ret;
950}
951
39279cc3
CM		 952/*
953 * taken from block_truncate_page, but does cow as it zeros out
954 * any bytes left in the last page in the file.
955 */
956static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
957{
958 struct inode *inode = mapping->host;
db94535d
CM		 959 struct btrfs_root *root = BTRFS_I(inode)->root;
960 u32 blocksize = root->sectorsize;
39279cc3
CM		 961 pgoff_t index = from >> PAGE_CACHE_SHIFT;
962 unsigned offset = from & (PAGE_CACHE_SIZE-1);
963 struct page *page;
39279cc3 964 int ret = 0;
a52d9a80 965 u64 page_start;
39279cc3
CM		 966
967 if ((offset & (blocksize - 1)) == 0)
968 goto out;
969
970 ret = -ENOMEM;
971 page = grab_cache_page(mapping, index);
972 if (!page)
973 goto out;
39279cc3 974 if (!PageUptodate(page)) {
9ebefb18 975 ret = btrfs_readpage(NULL, page);
39279cc3
CM		 976 lock_page(page);
977 if (!PageUptodate(page)) {
978 ret = -EIO;
979 goto out;
980 }
981 }
35ebb934 982 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
a52d9a80 983
b888db2b 984 ret = btrfs_cow_one_page(inode, page, offset);
39279cc3 985
39279cc3
CM		 986 unlock_page(page);
987 page_cache_release(page);
988out:
989 return ret;
990}
991
992static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
993{
994 struct inode *inode = dentry->d_inode;
995 int err;
996
997 err = inode_change_ok(inode, attr);
998 if (err)
999 return err;
1000
1001 if (S_ISREG(inode->i_mode) &&
1002 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
1003 struct btrfs_trans_handle *trans;
1004 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 1005 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2bf5a725 1006
5f39d397 1007 u64 mask = root->sectorsize - 1;
1b0f7c29 1008 u64 hole_start = (inode->i_size + mask) & ~mask;
f392a938 1009 u64 block_end = (attr->ia_size + mask) & ~mask;
39279cc3 1010 u64 hole_size;
179e29e4 1011 u64 alloc_hint = 0;
39279cc3 1012
1b0f7c29 1013 if (attr->ia_size <= hole_start)
39279cc3
CM		 1014 goto out;
1015
1832a6d5
CM		 1016 mutex_lock(&root->fs_info->fs_mutex);
1017 err = btrfs_check_free_space(root, 1, 0);
1018 mutex_unlock(&root->fs_info->fs_mutex);
1019 if (err)
1020 goto fail;
1021
39279cc3
CM		 1022 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1023
1b0f7c29 1024 lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
5f56406a 1025 hole_size = block_end - hole_start;
39279cc3
CM		 1026
1027 mutex_lock(&root->fs_info->fs_mutex);
1028 trans = btrfs_start_transaction(root, 1);
1029 btrfs_set_trans_block_group(trans, inode);
2bf5a725 1030 err = btrfs_drop_extents(trans, root, inode,
1b0f7c29 1031 hole_start, block_end, hole_start,
3326d1b0 1032 &alloc_hint);
2bf5a725 1033
179e29e4
CM		 1034 if (alloc_hint != EXTENT_MAP_INLINE) {
1035 err = btrfs_insert_file_extent(trans, root,
1036 inode->i_ino,
5f56406a
CM		 1037 hole_start, 0, 0,
1038 hole_size);
d1310b2e
CM		 1039 btrfs_drop_extent_cache(inode, hole_start,
1040 hole_size - 1);
5f56406a 1041 btrfs_check_file(root, inode);
179e29e4 1042 }
39279cc3
CM		 1043 btrfs_end_transaction(trans, root);
1044 mutex_unlock(&root->fs_info->fs_mutex);
1b0f7c29 1045 unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
54aa1f4d
CM		 1046 if (err)
1047 return err;
39279cc3
CM		 1048 }
1049out:
1050 err = inode_setattr(inode, attr);
1832a6d5 1051fail:
39279cc3
CM		 1052 return err;
1053}
61295eb8 1054
2da98f00 1055void btrfs_put_inode(struct inode *inode)
61295eb8 1056{
2da98f00
CM		 1057 int ret;
1058
1059 if (!BTRFS_I(inode)->ordered_trans) {
61295eb8
CM		 1060 return;
1061 }
2da98f00
CM		 1062
1063 if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
1064 mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK))
1065 return;
1066
1067 ret = btrfs_del_ordered_inode(inode);
1068 if (ret == 1) {
1069 atomic_dec(&inode->i_count);
1070 }
61295eb8
CM		 1071}
1072
39279cc3
CM		 1073void btrfs_delete_inode(struct inode *inode)
1074{
1075 struct btrfs_trans_handle *trans;
1076 struct btrfs_root *root = BTRFS_I(inode)->root;
d3c2fdcf 1077 unsigned long nr;
39279cc3
CM		 1078 int ret;
1079
1080 truncate_inode_pages(&inode->i_data, 0);
1081 if (is_bad_inode(inode)) {
1082 goto no_delete;
1083 }
5f39d397 1084
39279cc3
CM		 1085 inode->i_size = 0;
1086 mutex_lock(&root->fs_info->fs_mutex);
1087 trans = btrfs_start_transaction(root, 1);
5f39d397 1088
39279cc3 1089 btrfs_set_trans_block_group(trans, inode);
85e21bac 1090 ret = btrfs_truncate_in_trans(trans, root, inode, 0);
54aa1f4d
CM		 1091 if (ret)
1092 goto no_delete_lock;
85e21bac 1093
d3c2fdcf 1094 nr = trans->blocks_used;
85e21bac 1095 clear_inode(inode);
5f39d397 1096
39279cc3
CM		 1097 btrfs_end_transaction(trans, root);
1098 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1099 btrfs_btree_balance_dirty(root, nr);
e2008b61 1100 btrfs_throttle(root);
39279cc3 1101 return;
54aa1f4d
CM		 1102
1103no_delete_lock:
d3c2fdcf 1104 nr = trans->blocks_used;
54aa1f4d
CM		 1105 btrfs_end_transaction(trans, root);
1106 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1107 btrfs_btree_balance_dirty(root, nr);
e2008b61 1108 btrfs_throttle(root);
39279cc3
CM		 1109no_delete:
1110 clear_inode(inode);
1111}
1112
1113/*
1114 * this returns the key found in the dir entry in the location pointer.
1115 * If no dir entries were found, location->objectid is 0.
1116 */
1117static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
1118 struct btrfs_key *location)
1119{
1120 const char *name = dentry->d_name.name;
1121 int namelen = dentry->d_name.len;
1122 struct btrfs_dir_item *di;
1123 struct btrfs_path *path;
1124 struct btrfs_root *root = BTRFS_I(dir)->root;
0d9f7f3e 1125 int ret = 0;
39279cc3 1126
3954401f
CM		 1127 if (namelen == 1 && strcmp(name, ".") == 0) {
1128 location->objectid = dir->i_ino;
1129 location->type = BTRFS_INODE_ITEM_KEY;
1130 location->offset = 0;
1131 return 0;
1132 }
39279cc3
CM		 1133 path = btrfs_alloc_path();
1134 BUG_ON(!path);
3954401f 1135
7a720536 1136 if (namelen == 2 && strcmp(name, "..") == 0) {
3954401f
CM		 1137 struct btrfs_key key;
1138 struct extent_buffer *leaf;
1139 u32 nritems;
1140 int slot;
1141
1142 key.objectid = dir->i_ino;
1143 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1144 key.offset = 0;
1145 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1146 BUG_ON(ret == 0);
1147 ret = 0;
1148
1149 leaf = path->nodes[0];
1150 slot = path->slots[0];
1151 nritems = btrfs_header_nritems(leaf);
1152 if (slot >= nritems)
1153 goto out_err;
1154
1155 btrfs_item_key_to_cpu(leaf, &key, slot);
1156 if (key.objectid != dir->i_ino ||
1157 key.type != BTRFS_INODE_REF_KEY) {
1158 goto out_err;
1159 }
1160 location->objectid = key.offset;
1161 location->type = BTRFS_INODE_ITEM_KEY;
1162 location->offset = 0;
1163 goto out;
1164 }
1165
39279cc3
CM		 1166 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1167 namelen, 0);
0d9f7f3e
Y		 1168 if (IS_ERR(di))
1169 ret = PTR_ERR(di);
39279cc3 1170 if (!di || IS_ERR(di)) {
3954401f 1171 goto out_err;
39279cc3 1172 }
5f39d397 1173 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
39279cc3 1174out:
39279cc3
CM		 1175 btrfs_free_path(path);
1176 return ret;
3954401f
CM		 1177out_err:
1178 location->objectid = 0;
1179 goto out;
39279cc3
CM		 1180}
1181
1182/*
1183 * when we hit a tree root in a directory, the btrfs part of the inode
1184 * needs to be changed to reflect the root directory of the tree root. This
1185 * is kind of like crossing a mount point.
1186 */
1187static int fixup_tree_root_location(struct btrfs_root *root,
1188 struct btrfs_key *location,
58176a96
JB		 1189 struct btrfs_root **sub_root,
1190 struct dentry *dentry)
39279cc3
CM		 1191{
1192 struct btrfs_path *path;
1193 struct btrfs_root_item *ri;
1194
1195 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1196 return 0;
1197 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1198 return 0;
1199
1200 path = btrfs_alloc_path();
1201 BUG_ON(!path);
1202 mutex_lock(&root->fs_info->fs_mutex);
1203
58176a96
JB		 1204 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1205 dentry->d_name.name,
1206 dentry->d_name.len);
39279cc3
CM		 1207 if (IS_ERR(*sub_root))
1208 return PTR_ERR(*sub_root);
1209
1210 ri = &(*sub_root)->root_item;
1211 location->objectid = btrfs_root_dirid(ri);
39279cc3
CM		 1212 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1213 location->offset = 0;
1214
1215 btrfs_free_path(path);
1216 mutex_unlock(&root->fs_info->fs_mutex);
1217 return 0;
1218}
1219
1220static int btrfs_init_locked_inode(struct inode *inode, void *p)
1221{
1222 struct btrfs_iget_args *args = p;
1223 inode->i_ino = args->ino;
1224 BTRFS_I(inode)->root = args->root;
d1310b2e
CM		 1225 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1226 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
b888db2b 1227 inode->i_mapping, GFP_NOFS);
39279cc3
CM		 1228 return 0;
1229}
1230
1231static int btrfs_find_actor(struct inode *inode, void *opaque)
1232{
1233 struct btrfs_iget_args *args = opaque;
1234 return (args->ino == inode->i_ino &&
1235 args->root == BTRFS_I(inode)->root);
1236}
1237
dc17ff8f
CM		 1238struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1239 u64 root_objectid)
1240{
1241 struct btrfs_iget_args args;
1242 args.ino = objectid;
1243 args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid);
1244
1245 if (!args.root)
1246 return NULL;
1247
1248 return ilookup5(s, objectid, btrfs_find_actor, (void *)&args);
1249}
1250
39279cc3
CM		 1251struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1252 struct btrfs_root *root)
1253{
1254 struct inode *inode;
1255 struct btrfs_iget_args args;
1256 args.ino = objectid;
1257 args.root = root;
1258
1259 inode = iget5_locked(s, objectid, btrfs_find_actor,
1260 btrfs_init_locked_inode,
1261 (void *)&args);
1262 return inode;
1263}
1264
1265static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1266 struct nameidata *nd)
1267{
1268 struct inode * inode;
1269 struct btrfs_inode *bi = BTRFS_I(dir);
1270 struct btrfs_root *root = bi->root;
1271 struct btrfs_root *sub_root = root;
1272 struct btrfs_key location;
1273 int ret;
1274
1275 if (dentry->d_name.len > BTRFS_NAME_LEN)
1276 return ERR_PTR(-ENAMETOOLONG);
5f39d397 1277
39279cc3
CM		 1278 mutex_lock(&root->fs_info->fs_mutex);
1279 ret = btrfs_inode_by_name(dir, dentry, &location);
1280 mutex_unlock(&root->fs_info->fs_mutex);
5f39d397 1281
39279cc3
CM		 1282 if (ret < 0)
1283 return ERR_PTR(ret);
5f39d397 1284
39279cc3
CM		 1285 inode = NULL;
1286 if (location.objectid) {
58176a96
JB		 1287 ret = fixup_tree_root_location(root, &location, &sub_root,
1288 dentry);
39279cc3
CM		 1289 if (ret < 0)
1290 return ERR_PTR(ret);
1291 if (ret > 0)
1292 return ERR_PTR(-ENOENT);
1293 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1294 sub_root);
1295 if (!inode)
1296 return ERR_PTR(-EACCES);
1297 if (inode->i_state & I_NEW) {
1298 /* the inode and parent dir are two different roots */
1299 if (sub_root != root) {
1300 igrab(inode);
1301 sub_root->inode = inode;
1302 }
1303 BTRFS_I(inode)->root = sub_root;
1304 memcpy(&BTRFS_I(inode)->location, &location,
1305 sizeof(location));
1306 btrfs_read_locked_inode(inode);
1307 unlock_new_inode(inode);
1308 }
1309 }
1310 return d_splice_alias(inode, dentry);
1311}
1312
39279cc3
CM		 1313static unsigned char btrfs_filetype_table[] = {
1314 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1315};
1316
1317static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1318{
6da6abae 1319 struct inode *inode = filp->f_dentry->d_inode;
39279cc3
CM		 1320 struct btrfs_root *root = BTRFS_I(inode)->root;
1321 struct btrfs_item *item;
1322 struct btrfs_dir_item *di;
1323 struct btrfs_key key;
5f39d397 1324 struct btrfs_key found_key;
39279cc3
CM		 1325 struct btrfs_path *path;
1326 int ret;
1327 u32 nritems;
5f39d397 1328 struct extent_buffer *leaf;
39279cc3
CM		 1329 int slot;
1330 int advance;
1331 unsigned char d_type;
1332 int over = 0;
1333 u32 di_cur;
1334 u32 di_total;
1335 u32 di_len;
1336 int key_type = BTRFS_DIR_INDEX_KEY;
5f39d397
CM		 1337 char tmp_name[32];
1338 char *name_ptr;
1339 int name_len;
39279cc3
CM		 1340
1341 /* FIXME, use a real flag for deciding about the key type */
1342 if (root->fs_info->tree_root == root)
1343 key_type = BTRFS_DIR_ITEM_KEY;
5f39d397 1344
3954401f
CM		 1345 /* special case for "." */
1346 if (filp->f_pos == 0) {
1347 over = filldir(dirent, ".", 1,
1348 1, inode->i_ino,
1349 DT_DIR);
1350 if (over)
1351 return 0;
1352 filp->f_pos = 1;
1353 }
1354
39279cc3
CM		 1355 mutex_lock(&root->fs_info->fs_mutex);
1356 key.objectid = inode->i_ino;
3954401f
CM		 1357 path = btrfs_alloc_path();
1358 path->reada = 2;
1359
1360 /* special case for .., just use the back ref */
1361 if (filp->f_pos == 1) {
1362 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1363 key.offset = 0;
1364 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1365 BUG_ON(ret == 0);
1366 leaf = path->nodes[0];
1367 slot = path->slots[0];
1368 nritems = btrfs_header_nritems(leaf);
1369 if (slot >= nritems) {
1370 btrfs_release_path(root, path);
1371 goto read_dir_items;
1372 }
1373 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1374 btrfs_release_path(root, path);
1375 if (found_key.objectid != key.objectid ||
1376 found_key.type != BTRFS_INODE_REF_KEY)
1377 goto read_dir_items;
1378 over = filldir(dirent, "..", 2,
1379 2, found_key.offset, DT_DIR);
1380 if (over)
1381 goto nopos;
1382 filp->f_pos = 2;
1383 }
1384
1385read_dir_items:
39279cc3
CM		 1386 btrfs_set_key_type(&key, key_type);
1387 key.offset = filp->f_pos;
5f39d397 1388
39279cc3
CM		 1389 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1390 if (ret < 0)
1391 goto err;
1392 advance = 0;
39279cc3 1393 while(1) {
5f39d397
CM		 1394 leaf = path->nodes[0];
1395 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1396 slot = path->slots[0];
1397 if (advance || slot >= nritems) {
1398 if (slot >= nritems -1) {
39279cc3
CM		 1399 ret = btrfs_next_leaf(root, path);
1400 if (ret)
1401 break;
5f39d397
CM		 1402 leaf = path->nodes[0];
1403 nritems = btrfs_header_nritems(leaf);
39279cc3
CM		 1404 slot = path->slots[0];
1405 } else {
1406 slot++;
1407 path->slots[0]++;
1408 }
1409 }
1410 advance = 1;
5f39d397
CM		 1411 item = btrfs_item_nr(leaf, slot);
1412 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1413
1414 if (found_key.objectid != key.objectid)
39279cc3 1415 break;
5f39d397 1416 if (btrfs_key_type(&found_key) != key_type)
39279cc3 1417 break;
5f39d397 1418 if (found_key.offset < filp->f_pos)
39279cc3 1419 continue;
5f39d397
CM		 1420
1421 filp->f_pos = found_key.offset;
39279cc3
CM		 1422 advance = 1;
1423 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1424 di_cur = 0;
5f39d397 1425 di_total = btrfs_item_size(leaf, item);
39279cc3 1426 while(di_cur < di_total) {
5f39d397
CM		 1427 struct btrfs_key location;
1428
1429 name_len = btrfs_dir_name_len(leaf, di);
1430 if (name_len < 32) {
1431 name_ptr = tmp_name;
1432 } else {
1433 name_ptr = kmalloc(name_len, GFP_NOFS);
1434 BUG_ON(!name_ptr);
1435 }
1436 read_extent_buffer(leaf, name_ptr,
1437 (unsigned long)(di + 1), name_len);
1438
1439 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1440 btrfs_dir_item_key_to_cpu(leaf, di, &location);
5f39d397
CM		 1441 over = filldir(dirent, name_ptr, name_len,
1442 found_key.offset,
1443 location.objectid,
39279cc3 1444 d_type);
5f39d397
CM		 1445
1446 if (name_ptr != tmp_name)
1447 kfree(name_ptr);
1448
39279cc3
CM		 1449 if (over)
1450 goto nopos;
5103e947
JB		 1451 di_len = btrfs_dir_name_len(leaf, di) +
1452 btrfs_dir_data_len(leaf, di) +sizeof(*di);
39279cc3
CM		 1453 di_cur += di_len;
1454 di = (struct btrfs_dir_item *)((char *)di + di_len);
1455 }
1456 }
c2a8b6e1 1457 filp->f_pos = INT_LIMIT(typeof(filp->f_pos));
39279cc3
CM		 1458nopos:
1459 ret = 0;
1460err:
1461 btrfs_release_path(root, path);
1462 btrfs_free_path(path);
1463 mutex_unlock(&root->fs_info->fs_mutex);
1464 return ret;
1465}
1466
1467int btrfs_write_inode(struct inode *inode, int wait)
1468{
1469 struct btrfs_root *root = BTRFS_I(inode)->root;
1470 struct btrfs_trans_handle *trans;
1471 int ret = 0;
1472
1473 if (wait) {
1474 mutex_lock(&root->fs_info->fs_mutex);
1475 trans = btrfs_start_transaction(root, 1);
1476 btrfs_set_trans_block_group(trans, inode);
1477 ret = btrfs_commit_transaction(trans, root);
1478 mutex_unlock(&root->fs_info->fs_mutex);
1479 }
1480 return ret;
1481}
1482
1483/*
54aa1f4d 1484 * This is somewhat expensive, updating the tree every time the
39279cc3
CM		 1485 * inode changes. But, it is most likely to find the inode in cache.
1486 * FIXME, needs more benchmarking...there are no reasons other than performance
1487 * to keep or drop this code.
1488 */
1489void btrfs_dirty_inode(struct inode *inode)
1490{
1491 struct btrfs_root *root = BTRFS_I(inode)->root;
1492 struct btrfs_trans_handle *trans;
1493
1494 mutex_lock(&root->fs_info->fs_mutex);
1495 trans = btrfs_start_transaction(root, 1);
1496 btrfs_set_trans_block_group(trans, inode);
1497 btrfs_update_inode(trans, root, inode);
1498 btrfs_end_transaction(trans, root);
1499 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 1500}
1501
1502static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1503 struct btrfs_root *root,
9c58309d
CM		 1504 const char *name, int name_len,
1505 u64 ref_objectid,
39279cc3
CM		 1506 u64 objectid,
1507 struct btrfs_block_group_cache *group,
1508 int mode)
1509{
1510 struct inode *inode;
5f39d397 1511 struct btrfs_inode_item *inode_item;
39279cc3 1512 struct btrfs_key *location;
5f39d397 1513 struct btrfs_path *path;
9c58309d
CM		 1514 struct btrfs_inode_ref *ref;
1515 struct btrfs_key key[2];
1516 u32 sizes[2];
1517 unsigned long ptr;
39279cc3
CM		 1518 int ret;
1519 int owner;
1520
5f39d397
CM		 1521 path = btrfs_alloc_path();
1522 BUG_ON(!path);
1523
39279cc3
CM		 1524 inode = new_inode(root->fs_info->sb);
1525 if (!inode)
1526 return ERR_PTR(-ENOMEM);
1527
d1310b2e
CM		 1528 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1529 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
b888db2b 1530 inode->i_mapping, GFP_NOFS);
39279cc3 1531 BTRFS_I(inode)->root = root;
b888db2b 1532
39279cc3
CM		 1533 if (mode & S_IFDIR)
1534 owner = 0;
1535 else
1536 owner = 1;
1537 group = btrfs_find_block_group(root, group, 0, 0, owner);
1538 BTRFS_I(inode)->block_group = group;
b98b6767 1539 BTRFS_I(inode)->flags = 0;
9c58309d
CM		 1540
1541 key[0].objectid = objectid;
1542 btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY);
1543 key[0].offset = 0;
1544
1545 key[1].objectid = objectid;
1546 btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY);
1547 key[1].offset = ref_objectid;
1548
1549 sizes[0] = sizeof(struct btrfs_inode_item);
1550 sizes[1] = name_len + sizeof(*ref);
1551
1552 ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2);
1553 if (ret != 0)
5f39d397
CM		 1554 goto fail;
1555
9c58309d
CM		 1556 if (objectid > root->highest_inode)
1557 root->highest_inode = objectid;
1558
39279cc3
CM		 1559 inode->i_uid = current->fsuid;
1560 inode->i_gid = current->fsgid;
1561 inode->i_mode = mode;
1562 inode->i_ino = objectid;
1563 inode->i_blocks = 0;
1564 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
5f39d397
CM		 1565 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1566 struct btrfs_inode_item);
1567 fill_inode_item(path->nodes[0], inode_item, inode);
9c58309d
CM		 1568
1569 ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
1570 struct btrfs_inode_ref);
1571 btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
1572 ptr = (unsigned long)(ref + 1);
1573 write_extent_buffer(path->nodes[0], name, ptr, name_len);
1574
5f39d397
CM		 1575 btrfs_mark_buffer_dirty(path->nodes[0]);
1576 btrfs_free_path(path);
1577
39279cc3
CM		 1578 location = &BTRFS_I(inode)->location;
1579 location->objectid = objectid;
39279cc3
CM		 1580 location->offset = 0;
1581 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1582
39279cc3
CM		 1583 insert_inode_hash(inode);
1584 return inode;
5f39d397
CM		 1585fail:
1586 btrfs_free_path(path);
1587 return ERR_PTR(ret);
39279cc3
CM		 1588}
1589
1590static inline u8 btrfs_inode_type(struct inode *inode)
1591{
1592 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1593}
1594
1595static int btrfs_add_link(struct btrfs_trans_handle *trans,
9c58309d
CM		 1596 struct dentry *dentry, struct inode *inode,
1597 int add_backref)
39279cc3
CM		 1598{
1599 int ret;
1600 struct btrfs_key key;
1601 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
79c44584 1602 struct inode *parent_inode;
5f39d397 1603
39279cc3 1604 key.objectid = inode->i_ino;
39279cc3
CM		 1605 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1606 key.offset = 0;
1607
1608 ret = btrfs_insert_dir_item(trans, root,
1609 dentry->d_name.name, dentry->d_name.len,
1610 dentry->d_parent->d_inode->i_ino,
1611 &key, btrfs_inode_type(inode));
1612 if (ret == 0) {
9c58309d
CM		 1613 if (add_backref) {
1614 ret = btrfs_insert_inode_ref(trans, root,
1615 dentry->d_name.name,
1616 dentry->d_name.len,
1617 inode->i_ino,
1618 dentry->d_parent->d_inode->i_ino);
1619 }
79c44584
CM		 1620 parent_inode = dentry->d_parent->d_inode;
1621 parent_inode->i_size += dentry->d_name.len * 2;
1622 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
39279cc3
CM		 1623 ret = btrfs_update_inode(trans, root,
1624 dentry->d_parent->d_inode);
1625 }
1626 return ret;
1627}
1628
1629static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
9c58309d
CM		 1630 struct dentry *dentry, struct inode *inode,
1631 int backref)
39279cc3 1632{
9c58309d 1633 int err = btrfs_add_link(trans, dentry, inode, backref);
39279cc3
CM		 1634 if (!err) {
1635 d_instantiate(dentry, inode);
1636 return 0;
1637 }
1638 if (err > 0)
1639 err = -EEXIST;
1640 return err;
1641}
1642
618e21d5
JB		 1643static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1644 int mode, dev_t rdev)
1645{
1646 struct btrfs_trans_handle *trans;
1647 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 1648 struct inode *inode = NULL;
618e21d5
JB		 1649 int err;
1650 int drop_inode = 0;
1651 u64 objectid;
1832a6d5 1652 unsigned long nr = 0;
618e21d5
JB		 1653
1654 if (!new_valid_dev(rdev))
1655 return -EINVAL;
1656
1657 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1658 err = btrfs_check_free_space(root, 1, 0);
1659 if (err)
1660 goto fail;
1661
618e21d5
JB		 1662 trans = btrfs_start_transaction(root, 1);
1663 btrfs_set_trans_block_group(trans, dir);
1664
1665 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1666 if (err) {
1667 err = -ENOSPC;
1668 goto out_unlock;
1669 }
1670
9c58309d
CM		 1671 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1672 dentry->d_name.len,
1673 dentry->d_parent->d_inode->i_ino, objectid,
618e21d5
JB		 1674 BTRFS_I(dir)->block_group, mode);
1675 err = PTR_ERR(inode);
1676 if (IS_ERR(inode))
1677 goto out_unlock;
1678
1679 btrfs_set_trans_block_group(trans, inode);
9c58309d 1680 err = btrfs_add_nondir(trans, dentry, inode, 0);
618e21d5
JB		 1681 if (err)
1682 drop_inode = 1;
1683 else {
1684 inode->i_op = &btrfs_special_inode_operations;
1685 init_special_inode(inode, inode->i_mode, rdev);
1b4ab1bb 1686 btrfs_update_inode(trans, root, inode);
618e21d5
JB		 1687 }
1688 dir->i_sb->s_dirt = 1;
1689 btrfs_update_inode_block_group(trans, inode);
1690 btrfs_update_inode_block_group(trans, dir);
1691out_unlock:
d3c2fdcf 1692 nr = trans->blocks_used;
618e21d5 1693 btrfs_end_transaction(trans, root);
1832a6d5 1694fail:
618e21d5
JB		 1695 mutex_unlock(&root->fs_info->fs_mutex);
1696
1697 if (drop_inode) {
1698 inode_dec_link_count(inode);
1699 iput(inode);
1700 }
d3c2fdcf 1701 btrfs_btree_balance_dirty(root, nr);
e2008b61 1702 btrfs_throttle(root);
618e21d5
JB		 1703 return err;
1704}
1705
39279cc3
CM		 1706static int btrfs_create(struct inode *dir, struct dentry *dentry,
1707 int mode, struct nameidata *nd)
1708{
1709 struct btrfs_trans_handle *trans;
1710 struct btrfs_root *root = BTRFS_I(dir)->root;
1832a6d5 1711 struct inode *inode = NULL;
39279cc3
CM		 1712 int err;
1713 int drop_inode = 0;
1832a6d5 1714 unsigned long nr = 0;
39279cc3
CM		 1715 u64 objectid;
1716
1717 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1718 err = btrfs_check_free_space(root, 1, 0);
1719 if (err)
1720 goto fail;
39279cc3
CM		 1721 trans = btrfs_start_transaction(root, 1);
1722 btrfs_set_trans_block_group(trans, dir);
1723
1724 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1725 if (err) {
1726 err = -ENOSPC;
1727 goto out_unlock;
1728 }
1729
9c58309d
CM		 1730 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1731 dentry->d_name.len,
1732 dentry->d_parent->d_inode->i_ino,
1733 objectid, BTRFS_I(dir)->block_group, mode);
39279cc3
CM		 1734 err = PTR_ERR(inode);
1735 if (IS_ERR(inode))
1736 goto out_unlock;
1737
1738 btrfs_set_trans_block_group(trans, inode);
9c58309d 1739 err = btrfs_add_nondir(trans, dentry, inode, 0);
39279cc3
CM		 1740 if (err)
1741 drop_inode = 1;
1742 else {
1743 inode->i_mapping->a_ops = &btrfs_aops;
1744 inode->i_fop = &btrfs_file_operations;
1745 inode->i_op = &btrfs_file_inode_operations;
d1310b2e
CM		 1746 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1747 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
a52d9a80 1748 inode->i_mapping, GFP_NOFS);
d1310b2e 1749 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 1750 }
1751 dir->i_sb->s_dirt = 1;
1752 btrfs_update_inode_block_group(trans, inode);
1753 btrfs_update_inode_block_group(trans, dir);
1754out_unlock:
d3c2fdcf 1755 nr = trans->blocks_used;
39279cc3 1756 btrfs_end_transaction(trans, root);
1832a6d5 1757fail:
39279cc3
CM		 1758 mutex_unlock(&root->fs_info->fs_mutex);
1759
1760 if (drop_inode) {
1761 inode_dec_link_count(inode);
1762 iput(inode);
1763 }
d3c2fdcf 1764 btrfs_btree_balance_dirty(root, nr);
e2008b61 1765 btrfs_throttle(root);
39279cc3
CM		 1766 return err;
1767}
1768
1769static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1770 struct dentry *dentry)
1771{
1772 struct btrfs_trans_handle *trans;
1773 struct btrfs_root *root = BTRFS_I(dir)->root;
1774 struct inode *inode = old_dentry->d_inode;
1832a6d5 1775 unsigned long nr = 0;
39279cc3
CM		 1776 int err;
1777 int drop_inode = 0;
1778
1779 if (inode->i_nlink == 0)
1780 return -ENOENT;
1781
6da6abae
CM		 1782#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1783 inode->i_nlink++;
1784#else
39279cc3 1785 inc_nlink(inode);
6da6abae 1786#endif
39279cc3 1787 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1788 err = btrfs_check_free_space(root, 1, 0);
1789 if (err)
1790 goto fail;
39279cc3 1791 trans = btrfs_start_transaction(root, 1);
5f39d397 1792
39279cc3
CM		 1793 btrfs_set_trans_block_group(trans, dir);
1794 atomic_inc(&inode->i_count);
9c58309d 1795 err = btrfs_add_nondir(trans, dentry, inode, 1);
5f39d397 1796
39279cc3
CM		 1797 if (err)
1798 drop_inode = 1;
5f39d397 1799
39279cc3
CM		 1800 dir->i_sb->s_dirt = 1;
1801 btrfs_update_inode_block_group(trans, dir);
54aa1f4d 1802 err = btrfs_update_inode(trans, root, inode);
5f39d397 1803
54aa1f4d
CM		 1804 if (err)
1805 drop_inode = 1;
39279cc3 1806
d3c2fdcf 1807 nr = trans->blocks_used;
39279cc3 1808 btrfs_end_transaction(trans, root);
1832a6d5 1809fail:
39279cc3
CM		 1810 mutex_unlock(&root->fs_info->fs_mutex);
1811
1812 if (drop_inode) {
1813 inode_dec_link_count(inode);
1814 iput(inode);
1815 }
d3c2fdcf 1816 btrfs_btree_balance_dirty(root, nr);
e2008b61 1817 btrfs_throttle(root);
39279cc3
CM		 1818 return err;
1819}
1820
39279cc3
CM		 1821static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1822{
1823 struct inode *inode;
1824 struct btrfs_trans_handle *trans;
1825 struct btrfs_root *root = BTRFS_I(dir)->root;
1826 int err = 0;
1827 int drop_on_err = 0;
1828 u64 objectid;
d3c2fdcf 1829 unsigned long nr = 1;
39279cc3
CM		 1830
1831 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 1832 err = btrfs_check_free_space(root, 1, 0);
1833 if (err)
1834 goto out_unlock;
1835
39279cc3
CM		 1836 trans = btrfs_start_transaction(root, 1);
1837 btrfs_set_trans_block_group(trans, dir);
5f39d397 1838
39279cc3
CM		 1839 if (IS_ERR(trans)) {
1840 err = PTR_ERR(trans);
1841 goto out_unlock;
1842 }
1843
1844 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1845 if (err) {
1846 err = -ENOSPC;
1847 goto out_unlock;
1848 }
1849
9c58309d
CM		 1850 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1851 dentry->d_name.len,
1852 dentry->d_parent->d_inode->i_ino, objectid,
39279cc3
CM		 1853 BTRFS_I(dir)->block_group, S_IFDIR | mode);
1854 if (IS_ERR(inode)) {
1855 err = PTR_ERR(inode);
1856 goto out_fail;
1857 }
5f39d397 1858
39279cc3
CM		 1859 drop_on_err = 1;
1860 inode->i_op = &btrfs_dir_inode_operations;
1861 inode->i_fop = &btrfs_dir_file_operations;
1862 btrfs_set_trans_block_group(trans, inode);
1863
3954401f 1864 inode->i_size = 0;
39279cc3
CM		 1865 err = btrfs_update_inode(trans, root, inode);
1866 if (err)
1867 goto out_fail;
5f39d397 1868
9c58309d 1869 err = btrfs_add_link(trans, dentry, inode, 0);
39279cc3
CM		 1870 if (err)
1871 goto out_fail;
5f39d397 1872
39279cc3
CM		 1873 d_instantiate(dentry, inode);
1874 drop_on_err = 0;
1875 dir->i_sb->s_dirt = 1;
1876 btrfs_update_inode_block_group(trans, inode);
1877 btrfs_update_inode_block_group(trans, dir);
1878
1879out_fail:
d3c2fdcf 1880 nr = trans->blocks_used;
39279cc3 1881 btrfs_end_transaction(trans, root);
5f39d397 1882
39279cc3
CM		 1883out_unlock:
1884 mutex_unlock(&root->fs_info->fs_mutex);
1885 if (drop_on_err)
1886 iput(inode);
d3c2fdcf 1887 btrfs_btree_balance_dirty(root, nr);
e2008b61 1888 btrfs_throttle(root);
39279cc3
CM		 1889 return err;
1890}
1891
a52d9a80 1892struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
70dec807 1893 size_t pg_offset, u64 start, u64 len,
a52d9a80
CM		 1894 int create)
1895{
1896 int ret;
1897 int err = 0;
db94535d 1898 u64 bytenr;
a52d9a80
CM		 1899 u64 extent_start = 0;
1900 u64 extent_end = 0;
1901 u64 objectid = inode->i_ino;
1902 u32 found_type;
a52d9a80
CM		 1903 struct btrfs_path *path;
1904 struct btrfs_root *root = BTRFS_I(inode)->root;
1905 struct btrfs_file_extent_item *item;
5f39d397
CM		 1906 struct extent_buffer *leaf;
1907 struct btrfs_key found_key;
a52d9a80
CM		 1908 struct extent_map *em = NULL;
1909 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
d1310b2e 1910 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
a52d9a80
CM		 1911 struct btrfs_trans_handle *trans = NULL;
1912
1913 path = btrfs_alloc_path();
1914 BUG_ON(!path);
1915 mutex_lock(&root->fs_info->fs_mutex);
1916
1917again:
d1310b2e
CM		 1918 spin_lock(&em_tree->lock);
1919 em = lookup_extent_mapping(em_tree, start, len);
1920 spin_unlock(&em_tree->lock);
1921
a52d9a80 1922 if (em) {
56b453c9 1923 if (em->start > start) {
d1310b2e
CM		 1924 printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n",
1925 start, len, em->start, em->len);
56b453c9
CM		 1926 WARN_ON(1);
1927 }
70dec807
CM		 1928 if (em->block_start == EXTENT_MAP_INLINE && page)
1929 free_extent_map(em);
1930 else
1931 goto out;
a52d9a80 1932 }
d1310b2e 1933 em = alloc_extent_map(GFP_NOFS);
a52d9a80 1934 if (!em) {
d1310b2e
CM		 1935 err = -ENOMEM;
1936 goto out;
a52d9a80 1937 }
d1310b2e
CM		 1938
1939 em->start = EXTENT_MAP_HOLE;
1940 em->len = (u64)-1;
a52d9a80 1941 em->bdev = inode->i_sb->s_bdev;
179e29e4
CM		 1942 ret = btrfs_lookup_file_extent(trans, root, path,
1943 objectid, start, trans != NULL);
a52d9a80
CM		 1944 if (ret < 0) {
1945 err = ret;
1946 goto out;
1947 }
1948
1949 if (ret != 0) {
1950 if (path->slots[0] == 0)
1951 goto not_found;
1952 path->slots[0]--;
1953 }
1954
5f39d397
CM		 1955 leaf = path->nodes[0];
1956 item = btrfs_item_ptr(leaf, path->slots[0],
a52d9a80 1957 struct btrfs_file_extent_item);
a52d9a80 1958 /* are we inside the extent that was found? */
5f39d397
CM		 1959 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1960 found_type = btrfs_key_type(&found_key);
1961 if (found_key.objectid != objectid ||
a52d9a80
CM		 1962 found_type != BTRFS_EXTENT_DATA_KEY) {
1963 goto not_found;
1964 }
1965
5f39d397
CM		 1966 found_type = btrfs_file_extent_type(leaf, item);
1967 extent_start = found_key.offset;
a52d9a80
CM		 1968 if (found_type == BTRFS_FILE_EXTENT_REG) {
1969 extent_end = extent_start +
db94535d 1970 btrfs_file_extent_num_bytes(leaf, item);
a52d9a80 1971 err = 0;
b888db2b 1972 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 1973 em->start = start;
1974 if (start < extent_start) {
d1310b2e 1975 if (start + len <= extent_start)
b888db2b 1976 goto not_found;
d1310b2e 1977 em->len = extent_end - extent_start;
a52d9a80 1978 } else {
d1310b2e 1979 em->len = len;
a52d9a80
CM		 1980 }
1981 goto not_found_em;
1982 }
db94535d
CM		 1983 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
1984 if (bytenr == 0) {
a52d9a80 1985 em->start = extent_start;
d1310b2e 1986 em->len = extent_end - extent_start;
5f39d397 1987 em->block_start = EXTENT_MAP_HOLE;
a52d9a80
CM		 1988 goto insert;
1989 }
db94535d
CM		 1990 bytenr += btrfs_file_extent_offset(leaf, item);
1991 em->block_start = bytenr;
a52d9a80 1992 em->start = extent_start;
d1310b2e 1993 em->len = extent_end - extent_start;
a52d9a80
CM		 1994 goto insert;
1995 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
70dec807 1996 u64 page_start;
5f39d397 1997 unsigned long ptr;
a52d9a80 1998 char *map;
3326d1b0
CM		 1999 size_t size;
2000 size_t extent_offset;
2001 size_t copy_size;
a52d9a80 2002
5f39d397
CM		 2003 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
2004 path->slots[0]));
d1310b2e
CM		 2005 extent_end = (extent_start + size + root->sectorsize - 1) &
2006 ~((u64)root->sectorsize - 1);
b888db2b 2007 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 2008 em->start = start;
2009 if (start < extent_start) {
d1310b2e 2010 if (start + len <= extent_start)
b888db2b 2011 goto not_found;
d1310b2e 2012 em->len = extent_end - extent_start;
a52d9a80 2013 } else {
d1310b2e 2014 em->len = len;
a52d9a80
CM		 2015 }
2016 goto not_found_em;
2017 }
689f9346 2018 em->block_start = EXTENT_MAP_INLINE;
689f9346
Y		 2019
2020 if (!page) {
2021 em->start = extent_start;
d1310b2e 2022 em->len = size;
689f9346
Y		 2023 goto out;
2024 }
5f39d397 2025
70dec807
CM		 2026 page_start = page_offset(page) + pg_offset;
2027 extent_offset = page_start - extent_start;
2028 copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset,
3326d1b0 2029 size - extent_offset);
3326d1b0 2030 em->start = extent_start + extent_offset;
70dec807
CM		 2031 em->len = (copy_size + root->sectorsize - 1) &
2032 ~((u64)root->sectorsize - 1);
689f9346
Y		 2033 map = kmap(page);
2034 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
179e29e4 2035 if (create == 0 && !PageUptodate(page)) {
70dec807 2036 read_extent_buffer(leaf, map + pg_offset, ptr,
179e29e4
CM		 2037 copy_size);
2038 flush_dcache_page(page);
2039 } else if (create && PageUptodate(page)) {
2040 if (!trans) {
2041 kunmap(page);
2042 free_extent_map(em);
2043 em = NULL;
2044 btrfs_release_path(root, path);
2045 trans = btrfs_start_transaction(root, 1);
2046 goto again;
2047 }
70dec807 2048 write_extent_buffer(leaf, map + pg_offset, ptr,
179e29e4
CM		 2049 copy_size);
2050 btrfs_mark_buffer_dirty(leaf);
a52d9a80 2051 }
a52d9a80 2052 kunmap(page);
d1310b2e
CM		 2053 set_extent_uptodate(io_tree, em->start,
2054 extent_map_end(em) - 1, GFP_NOFS);
a52d9a80
CM		 2055 goto insert;
2056 } else {
2057 printk("unkknown found_type %d\n", found_type);
2058 WARN_ON(1);
2059 }
2060not_found:
2061 em->start = start;
d1310b2e 2062 em->len = len;
a52d9a80 2063not_found_em:
5f39d397 2064 em->block_start = EXTENT_MAP_HOLE;
a52d9a80
CM		 2065insert:
2066 btrfs_release_path(root, path);
d1310b2e
CM		 2067 if (em->start > start || extent_map_end(em) <= start) {
2068 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len);
a52d9a80
CM		 2069 err = -EIO;
2070 goto out;
2071 }
d1310b2e
CM		 2072
2073 err = 0;
2074 spin_lock(&em_tree->lock);
a52d9a80
CM		 2075 ret = add_extent_mapping(em_tree, em);
2076 if (ret == -EEXIST) {
2077 free_extent_map(em);
d1310b2e
CM		 2078 em = lookup_extent_mapping(em_tree, start, len);
2079 if (!em) {
a52d9a80 2080 err = -EIO;
d1310b2e 2081 printk("failing to insert %Lu %Lu\n", start, len);
a52d9a80 2082 }
a52d9a80 2083 }
d1310b2e 2084 spin_unlock(&em_tree->lock);
a52d9a80
CM		 2085out:
2086 btrfs_free_path(path);
2087 if (trans) {
2088 ret = btrfs_end_transaction(trans, root);
2089 if (!err)
2090 err = ret;
2091 }
2092 mutex_unlock(&root->fs_info->fs_mutex);
2093 if (err) {
2094 free_extent_map(em);
2095 WARN_ON(1);
2096 return ERR_PTR(err);
2097 }
2098 return em;
2099}
2100
d396c6f5 2101static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
39279cc3 2102{
d396c6f5 2103 return extent_bmap(mapping, iblock, btrfs_get_extent);
39279cc3
CM		 2104}
2105
a52d9a80 2106int btrfs_readpage(struct file *file, struct page *page)
9ebefb18 2107{
d1310b2e
CM		 2108 struct extent_io_tree *tree;
2109 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80 2110 return extent_read_full_page(tree, page, btrfs_get_extent);
9ebefb18 2111}
1832a6d5 2112
a52d9a80 2113static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
39279cc3 2114{
d1310b2e 2115 struct extent_io_tree *tree;
b888db2b
CM		 2116
2117
2118 if (current->flags & PF_MEMALLOC) {
2119 redirty_page_for_writepage(wbc, page);
2120 unlock_page(page);
2121 return 0;
2122 }
d1310b2e 2123 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80 2124 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
9ebefb18
CM		 2125}
2126
b293f02e
CM		 2127static int btrfs_writepages(struct address_space *mapping,
2128 struct writeback_control *wbc)
2129{
d1310b2e
CM		 2130 struct extent_io_tree *tree;
2131 tree = &BTRFS_I(mapping->host)->io_tree;
b293f02e
CM		 2132 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
2133}
2134
3ab2fb5a
CM		 2135static int
2136btrfs_readpages(struct file *file, struct address_space *mapping,
2137 struct list_head *pages, unsigned nr_pages)
2138{
d1310b2e
CM		 2139 struct extent_io_tree *tree;
2140 tree = &BTRFS_I(mapping->host)->io_tree;
3ab2fb5a
CM		 2141 return extent_readpages(tree, mapping, pages, nr_pages,
2142 btrfs_get_extent);
2143}
2144
70dec807 2145static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
9ebefb18 2146{
d1310b2e
CM		 2147 struct extent_io_tree *tree;
2148 struct extent_map_tree *map;
a52d9a80 2149 int ret;
8c2383c3 2150
d1310b2e
CM		 2151 tree = &BTRFS_I(page->mapping->host)->io_tree;
2152 map = &BTRFS_I(page->mapping->host)->extent_tree;
70dec807 2153 ret = try_release_extent_mapping(map, tree, page, gfp_flags);
a52d9a80
CM		 2154 if (ret == 1) {
2155 ClearPagePrivate(page);
2156 set_page_private(page, 0);
2157 page_cache_release(page);
39279cc3 2158 }
a52d9a80 2159 return ret;
39279cc3
CM		 2160}
2161
a52d9a80 2162static void btrfs_invalidatepage(struct page *page, unsigned long offset)
39279cc3 2163{
d1310b2e 2164 struct extent_io_tree *tree;
39279cc3 2165
d1310b2e 2166 tree = &BTRFS_I(page->mapping->host)->io_tree;
a52d9a80
CM		 2167 extent_invalidatepage(tree, page, offset);
2168 btrfs_releasepage(page, GFP_NOFS);
39279cc3
CM		 2169}
2170
9ebefb18
CM		 2171/*
2172 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2173 * called from a page fault handler when a page is first dirtied. Hence we must
2174 * be careful to check for EOF conditions here. We set the page up correctly
2175 * for a written page which means we get ENOSPC checking when writing into
2176 * holes and correct delalloc and unwritten extent mapping on filesystems that
2177 * support these features.
2178 *
2179 * We are not allowed to take the i_mutex here so we have to play games to
2180 * protect against truncate races as the page could now be beyond EOF. Because
2181 * vmtruncate() writes the inode size before removing pages, once we have the
2182 * page lock we can determine safely if the page is beyond EOF. If it is not
2183 * beyond EOF, then the page is guaranteed safe against truncation until we
2184 * unlock the page.
2185 */
2186int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
2187{
6da6abae 2188 struct inode *inode = fdentry(vma->vm_file)->d_inode;
1832a6d5 2189 struct btrfs_root *root = BTRFS_I(inode)->root;
9ebefb18
CM		 2190 unsigned long end;
2191 loff_t size;
1832a6d5 2192 int ret;
a52d9a80 2193 u64 page_start;
9ebefb18 2194
1832a6d5
CM		 2195 mutex_lock(&root->fs_info->fs_mutex);
2196 ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
8f662a76 2197 mutex_unlock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2198 if (ret)
2199 goto out;
2200
2201 ret = -EINVAL;
2202
9ebefb18
CM		 2203 lock_page(page);
2204 wait_on_page_writeback(page);
9ebefb18 2205 size = i_size_read(inode);
35ebb934 2206 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
a52d9a80 2207
9ebefb18 2208 if ((page->mapping != inode->i_mapping) ||
a52d9a80 2209 (page_start > size)) {
9ebefb18
CM		 2210 /* page got truncated out from underneath us */
2211 goto out_unlock;
2212 }
2213
2214 /* page is wholly or partially inside EOF */
a52d9a80 2215 if (page_start + PAGE_CACHE_SIZE > size)
9ebefb18
CM		 2216 end = size & ~PAGE_CACHE_MASK;
2217 else
2218 end = PAGE_CACHE_SIZE;
2219
b888db2b 2220 ret = btrfs_cow_one_page(inode, page, end);
9ebefb18
CM		 2221
2222out_unlock:
2223 unlock_page(page);
1832a6d5 2224out:
9ebefb18
CM		 2225 return ret;
2226}
2227
39279cc3
CM		 2228static void btrfs_truncate(struct inode *inode)
2229{
2230 struct btrfs_root *root = BTRFS_I(inode)->root;
2231 int ret;
2232 struct btrfs_trans_handle *trans;
d3c2fdcf 2233 unsigned long nr;
39279cc3
CM		 2234
2235 if (!S_ISREG(inode->i_mode))
2236 return;
2237 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2238 return;
2239
2240 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2241
2242 mutex_lock(&root->fs_info->fs_mutex);
2243 trans = btrfs_start_transaction(root, 1);
2244 btrfs_set_trans_block_group(trans, inode);
2245
2246 /* FIXME, add redo link to tree so we don't leak on crash */
85e21bac
CM		 2247 ret = btrfs_truncate_in_trans(trans, root, inode,
2248 BTRFS_EXTENT_DATA_KEY);
39279cc3 2249 btrfs_update_inode(trans, root, inode);
d3c2fdcf 2250 nr = trans->blocks_used;
5f39d397 2251
39279cc3
CM		 2252 ret = btrfs_end_transaction(trans, root);
2253 BUG_ON(ret);
2254 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2255 btrfs_btree_balance_dirty(root, nr);
e2008b61 2256 btrfs_throttle(root);
39279cc3
CM		 2257}
2258
4313b399
CM		 2259static int noinline create_subvol(struct btrfs_root *root, char *name,
2260 int namelen)
39279cc3
CM		 2261{
2262 struct btrfs_trans_handle *trans;
2263 struct btrfs_key key;
2264 struct btrfs_root_item root_item;
2265 struct btrfs_inode_item *inode_item;
5f39d397 2266 struct extent_buffer *leaf;
dc17ff8f 2267 struct btrfs_root *new_root = root;
39279cc3
CM		 2268 struct inode *inode;
2269 struct inode *dir;
2270 int ret;
54aa1f4d 2271 int err;
39279cc3
CM		 2272 u64 objectid;
2273 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
d3c2fdcf 2274 unsigned long nr = 1;
39279cc3
CM		 2275
2276 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2277 ret = btrfs_check_free_space(root, 1, 0);
2278 if (ret)
2279 goto fail_commit;
2280
39279cc3
CM		 2281 trans = btrfs_start_transaction(root, 1);
2282 BUG_ON(!trans);
2283
7bb86316
CM		 2284 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2285 0, &objectid);
2286 if (ret)
2287 goto fail;
2288
2289 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2290 objectid, trans->transid, 0, 0,
2291 0, 0);
5f39d397
CM		 2292 if (IS_ERR(leaf))
2293 return PTR_ERR(leaf);
2294
2295 btrfs_set_header_nritems(leaf, 0);
2296 btrfs_set_header_level(leaf, 0);
db94535d 2297 btrfs_set_header_bytenr(leaf, leaf->start);
5f39d397 2298 btrfs_set_header_generation(leaf, trans->transid);
7bb86316
CM		 2299 btrfs_set_header_owner(leaf, objectid);
2300
5f39d397
CM		 2301 write_extent_buffer(leaf, root->fs_info->fsid,
2302 (unsigned long)btrfs_header_fsid(leaf),
2303 BTRFS_FSID_SIZE);
2304 btrfs_mark_buffer_dirty(leaf);
39279cc3
CM		 2305
2306 inode_item = &root_item.inode;
2307 memset(inode_item, 0, sizeof(*inode_item));
5f39d397
CM		 2308 inode_item->generation = cpu_to_le64(1);
2309 inode_item->size = cpu_to_le64(3);
2310 inode_item->nlink = cpu_to_le32(1);
2311 inode_item->nblocks = cpu_to_le64(1);
2312 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
39279cc3 2313
db94535d
CM		 2314 btrfs_set_root_bytenr(&root_item, leaf->start);
2315 btrfs_set_root_level(&root_item, 0);
39279cc3 2316 btrfs_set_root_refs(&root_item, 1);
5f39d397
CM		 2317 btrfs_set_root_used(&root_item, 0);
2318
5eda7b5e
CM		 2319 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2320 root_item.drop_level = 0;
5f39d397
CM		 2321
2322 free_extent_buffer(leaf);
2323 leaf = NULL;
39279cc3 2324
39279cc3
CM		 2325 btrfs_set_root_dirid(&root_item, new_dirid);
2326
2327 key.objectid = objectid;
2328 key.offset = 1;
39279cc3
CM		 2329 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2330 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2331 &root_item);
54aa1f4d
CM		 2332 if (ret)
2333 goto fail;
39279cc3
CM		 2334
2335 /*
2336 * insert the directory item
2337 */
2338 key.offset = (u64)-1;
2339 dir = root->fs_info->sb->s_root->d_inode;
2340 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2341 name, namelen, dir->i_ino, &key,
2342 BTRFS_FT_DIR);
54aa1f4d
CM		 2343 if (ret)
2344 goto fail;
39279cc3 2345
3954401f
CM		 2346 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2347 name, namelen, objectid,
2348 root->fs_info->sb->s_root->d_inode->i_ino);
2349 if (ret)
2350 goto fail;
2351
39279cc3 2352 ret = btrfs_commit_transaction(trans, root);
54aa1f4d
CM		 2353 if (ret)
2354 goto fail_commit;
39279cc3 2355
58176a96 2356 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
39279cc3
CM		 2357 BUG_ON(!new_root);
2358
2359 trans = btrfs_start_transaction(new_root, 1);
2360 BUG_ON(!trans);
2361
9c58309d
CM		 2362 inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid,
2363 new_dirid,
39279cc3 2364 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
54aa1f4d
CM		 2365 if (IS_ERR(inode))
2366 goto fail;
39279cc3
CM		 2367 inode->i_op = &btrfs_dir_inode_operations;
2368 inode->i_fop = &btrfs_dir_file_operations;
34088780 2369 new_root->inode = inode;
39279cc3 2370
3954401f
CM		 2371 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2372 new_dirid);
39279cc3 2373 inode->i_nlink = 1;
3954401f 2374 inode->i_size = 0;
39279cc3 2375 ret = btrfs_update_inode(trans, new_root, inode);
54aa1f4d
CM		 2376 if (ret)
2377 goto fail;
2378fail:
d3c2fdcf 2379 nr = trans->blocks_used;
dc17ff8f 2380 err = btrfs_commit_transaction(trans, new_root);
54aa1f4d
CM		 2381 if (err && !ret)
2382 ret = err;
2383fail_commit:
39279cc3 2384 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2385 btrfs_btree_balance_dirty(root, nr);
e2008b61 2386 btrfs_throttle(root);
54aa1f4d 2387 return ret;
39279cc3
CM		 2388}
2389
2390static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2391{
3063d29f 2392 struct btrfs_pending_snapshot *pending_snapshot;
39279cc3 2393 struct btrfs_trans_handle *trans;
39279cc3 2394 int ret;
54aa1f4d 2395 int err;
1832a6d5 2396 unsigned long nr = 0;
39279cc3
CM		 2397
2398 if (!root->ref_cows)
2399 return -EINVAL;
2400
2401 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2402 ret = btrfs_check_free_space(root, 1, 0);
2403 if (ret)
2404 goto fail_unlock;
2405
3063d29f
CM		 2406 pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
2407 if (!pending_snapshot) {
2408 ret = -ENOMEM;
2409 goto fail_unlock;
2410 }
fb4bc1e0 2411 pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
3063d29f
CM		 2412 if (!pending_snapshot->name) {
2413 ret = -ENOMEM;
2414 kfree(pending_snapshot);
2415 goto fail_unlock;
2416 }
fb4bc1e0
Y		 2417 memcpy(pending_snapshot->name, name, namelen);
2418 pending_snapshot->name[namelen] = '\0';
39279cc3
CM		 2419 trans = btrfs_start_transaction(root, 1);
2420 BUG_ON(!trans);
3063d29f
CM		 2421 pending_snapshot->root = root;
2422 list_add(&pending_snapshot->list,
2423 &trans->transaction->pending_snapshots);
39279cc3 2424 ret = btrfs_update_inode(trans, root, root->inode);
54aa1f4d 2425 err = btrfs_commit_transaction(trans, root);
5f39d397 2426
1832a6d5 2427fail_unlock:
39279cc3 2428 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 2429 btrfs_btree_balance_dirty(root, nr);
e2008b61 2430 btrfs_throttle(root);
54aa1f4d 2431 return ret;
39279cc3
CM		 2432}
2433
edbd8d4e 2434unsigned long btrfs_force_ra(struct address_space *mapping,
86479a04
CM		 2435 struct file_ra_state *ra, struct file *file,
2436 pgoff_t offset, pgoff_t last_index)
2437{
2438 pgoff_t req_size;
2439
2440#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2441 req_size = last_index - offset + 1;
2442 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2443 return offset;
2444#else
2445 req_size = min(last_index - offset + 1, (pgoff_t)128);
2446 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2447 return offset + req_size;
2448#endif
2449}
2450
2451int btrfs_defrag_file(struct file *file) {
6da6abae 2452 struct inode *inode = fdentry(file)->d_inode;
1832a6d5 2453 struct btrfs_root *root = BTRFS_I(inode)->root;
d1310b2e 2454 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
86479a04
CM		 2455 struct page *page;
2456 unsigned long last_index;
2457 unsigned long ra_index = 0;
2458 u64 page_start;
2459 u64 page_end;
2460 unsigned long i;
1832a6d5
CM		 2461 int ret;
2462
2463 mutex_lock(&root->fs_info->fs_mutex);
2464 ret = btrfs_check_free_space(root, inode->i_size, 0);
2465 mutex_unlock(&root->fs_info->fs_mutex);
2466 if (ret)
2467 return -ENOSPC;
86479a04
CM		 2468
2469 mutex_lock(&inode->i_mutex);
2470 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2471 for (i = 0; i <= last_index; i++) {
2472 if (i == ra_index) {
edbd8d4e
CM		 2473 ra_index = btrfs_force_ra(inode->i_mapping,
2474 &file->f_ra,
2475 file, ra_index, last_index);
86479a04
CM		 2476 }
2477 page = grab_cache_page(inode->i_mapping, i);
2478 if (!page)
2479 goto out_unlock;
2480 if (!PageUptodate(page)) {
2481 btrfs_readpage(NULL, page);
2482 lock_page(page);
2483 if (!PageUptodate(page)) {
2484 unlock_page(page);
2485 page_cache_release(page);
2486 goto out_unlock;
2487 }
2488 }
35ebb934 2489 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
86479a04
CM		 2490 page_end = page_start + PAGE_CACHE_SIZE - 1;
2491
d1310b2e 2492 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
d1310b2e 2493 set_extent_delalloc(io_tree, page_start,
86479a04 2494 page_end, GFP_NOFS);
edbd8d4e 2495
d1310b2e 2496 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
86479a04
CM		 2497 set_page_dirty(page);
2498 unlock_page(page);
2499 page_cache_release(page);
2500 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2501 }
2502
2503out_unlock:
2504 mutex_unlock(&inode->i_mutex);
2505 return 0;
2506}
2507
edbd8d4e
CM		 2508static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
2509{
2510 u64 new_size;
2511 u64 old_size;
2512 struct btrfs_ioctl_vol_args *vol_args;
2513 struct btrfs_trans_handle *trans;
2514 char *sizestr;
2515 int ret = 0;
2516 int namelen;
2517 int mod = 0;
2518
2519 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2520
2521 if (!vol_args)
2522 return -ENOMEM;
2523
2524 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2525 ret = -EFAULT;
2526 goto out;
2527 }
2528 namelen = strlen(vol_args->name);
2529 if (namelen > BTRFS_VOL_NAME_MAX) {
2530 ret = -EINVAL;
2531 goto out;
2532 }
2533
2534 sizestr = vol_args->name;
2535 if (!strcmp(sizestr, "max"))
2536 new_size = root->fs_info->sb->s_bdev->bd_inode->i_size;
2537 else {
2538 if (sizestr[0] == '-') {
2539 mod = -1;
2540 sizestr++;
2541 } else if (sizestr[0] == '+') {
2542 mod = 1;
2543 sizestr++;
2544 }
2545 new_size = btrfs_parse_size(sizestr);
2546 if (new_size == 0) {
2547 ret = -EINVAL;
2548 goto out;
2549 }
2550 }
2551
2552 mutex_lock(&root->fs_info->fs_mutex);
2553 old_size = btrfs_super_total_bytes(&root->fs_info->super_copy);
2554
2555 if (mod < 0) {
2556 if (new_size > old_size) {
2557 ret = -EINVAL;
2558 goto out_unlock;
2559 }
2560 new_size = old_size - new_size;
2561 } else if (mod > 0) {
2562 new_size = old_size + new_size;
2563 }
2564
2565 if (new_size < 256 * 1024 * 1024) {
2566 ret = -EINVAL;
2567 goto out_unlock;
2568 }
2569 if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) {
2570 ret = -EFBIG;
2571 goto out_unlock;
2572 }
f9ef6604
CM		 2573
2574 do_div(new_size, root->sectorsize);
2575 new_size *= root->sectorsize;
edbd8d4e
CM		 2576
2577printk("new size is %Lu\n", new_size);
2578 if (new_size > old_size) {
2579 trans = btrfs_start_transaction(root, 1);
2580 ret = btrfs_grow_extent_tree(trans, root, new_size);
2581 btrfs_commit_transaction(trans, root);
2582 } else {
2583 ret = btrfs_shrink_extent_tree(root, new_size);
2584 }
2585
2586out_unlock:
2587 mutex_unlock(&root->fs_info->fs_mutex);
2588out:
2589 kfree(vol_args);
2590 return ret;
2591}
2592
4313b399
CM		 2593static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root,
2594 void __user *arg)
39279cc3 2595{
4aec2b52 2596 struct btrfs_ioctl_vol_args *vol_args;
39279cc3 2597 struct btrfs_dir_item *di;
39279cc3
CM		 2598 struct btrfs_path *path;
2599 u64 root_dirid;
4aec2b52
CM		 2600 int namelen;
2601 int ret;
39279cc3 2602
4aec2b52 2603 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
5f39d397 2604
4aec2b52
CM		 2605 if (!vol_args)
2606 return -ENOMEM;
2607
2608 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2609 ret = -EFAULT;
2610 goto out;
2611 }
2612
2613 namelen = strlen(vol_args->name);
2614 if (namelen > BTRFS_VOL_NAME_MAX) {
2615 ret = -EINVAL;
2616 goto out;
2617 }
2618 if (strchr(vol_args->name, '/')) {
2619 ret = -EINVAL;
2620 goto out;
2621 }
d03581f4
CH		 2622
2623 path = btrfs_alloc_path();
4aec2b52
CM		 2624 if (!path) {
2625 ret = -ENOMEM;
2626 goto out;
2627 }
d03581f4
CH		 2628
2629 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2630 mutex_lock(&root->fs_info->fs_mutex);
2631 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2632 path, root_dirid,
4aec2b52 2633 vol_args->name, namelen, 0);
d03581f4
CH		 2634 mutex_unlock(&root->fs_info->fs_mutex);
2635 btrfs_free_path(path);
4aec2b52
CM		 2636
2637 if (di && !IS_ERR(di)) {
2638 ret = -EEXIST;
2639 goto out;
2640 }
2641
2642 if (IS_ERR(di)) {
2643 ret = PTR_ERR(di);
2644 goto out;
2645 }
d03581f4
CH		 2646
2647 if (root == root->fs_info->tree_root)
4aec2b52
CM		 2648 ret = create_subvol(root, vol_args->name, namelen);
2649 else
2650 ret = create_snapshot(root, vol_args->name, namelen);
2651out:
2652 kfree(vol_args);
2653 return ret;
d03581f4
CH		 2654}
2655
2656static int btrfs_ioctl_defrag(struct file *file)
2657{
6da6abae 2658 struct inode *inode = fdentry(file)->d_inode;
d03581f4
CH		 2659 struct btrfs_root *root = BTRFS_I(inode)->root;
2660
2661 switch (inode->i_mode & S_IFMT) {
2662 case S_IFDIR:
39279cc3 2663 mutex_lock(&root->fs_info->fs_mutex);
d03581f4
CH		 2664 btrfs_defrag_root(root, 0);
2665 btrfs_defrag_root(root->fs_info->extent_root, 0);
39279cc3 2666 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3 2667 break;
d03581f4
CH		 2668 case S_IFREG:
2669 btrfs_defrag_file(file);
2670 break;
2671 }
2672
2673 return 0;
2674}
6702ed49 2675
d03581f4
CH		 2676long btrfs_ioctl(struct file *file, unsigned int
2677 cmd, unsigned long arg)
2678{
6da6abae 2679 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
d03581f4
CH		 2680
2681 switch (cmd) {
2682 case BTRFS_IOC_SNAP_CREATE:
2683 return btrfs_ioctl_snap_create(root, (void __user *)arg);
6702ed49 2684 case BTRFS_IOC_DEFRAG:
d03581f4 2685 return btrfs_ioctl_defrag(file);
edbd8d4e
CM		 2686 case BTRFS_IOC_RESIZE:
2687 return btrfs_ioctl_resize(root, (void __user *)arg);
39279cc3 2688 }
d03581f4
CH		 2689
2690 return -ENOTTY;
39279cc3
CM		 2691}
2692
39279cc3
CM		 2693/*
2694 * Called inside transaction, so use GFP_NOFS
2695 */
2696struct inode *btrfs_alloc_inode(struct super_block *sb)
2697{
2698 struct btrfs_inode *ei;
2699
2700 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2701 if (!ei)
2702 return NULL;
15ee9bc7 2703 ei->last_trans = 0;
dc17ff8f 2704 ei->ordered_trans = 0;
39279cc3
CM		 2705 return &ei->vfs_inode;
2706}
2707
2708void btrfs_destroy_inode(struct inode *inode)
2709{
2710 WARN_ON(!list_empty(&inode->i_dentry));
2711 WARN_ON(inode->i_data.nrpages);
2712
8c416c9e 2713 btrfs_drop_extent_cache(inode, 0, (u64)-1);
39279cc3
CM		 2714 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2715}
2716
44ec0b71
CM		 2717#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2718static void init_once(struct kmem_cache * cachep, void *foo)
2719#else
39279cc3
CM		 2720static void init_once(void * foo, struct kmem_cache * cachep,
2721 unsigned long flags)
44ec0b71 2722#endif
39279cc3
CM		 2723{
2724 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2725
2726 inode_init_once(&ei->vfs_inode);
2727}
2728
2729void btrfs_destroy_cachep(void)
2730{
2731 if (btrfs_inode_cachep)
2732 kmem_cache_destroy(btrfs_inode_cachep);
2733 if (btrfs_trans_handle_cachep)
2734 kmem_cache_destroy(btrfs_trans_handle_cachep);
2735 if (btrfs_transaction_cachep)
2736 kmem_cache_destroy(btrfs_transaction_cachep);
2737 if (btrfs_bit_radix_cachep)
2738 kmem_cache_destroy(btrfs_bit_radix_cachep);
2739 if (btrfs_path_cachep)
2740 kmem_cache_destroy(btrfs_path_cachep);
2741}
2742
86479a04 2743struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
92fee66d 2744 unsigned long extra_flags,
44ec0b71
CM		 2745#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2746 void (*ctor)(struct kmem_cache *, void *)
2747#else
92fee66d 2748 void (*ctor)(void *, struct kmem_cache *,
44ec0b71
CM		 2749 unsigned long)
2750#endif
2751 )
92fee66d
CM		 2752{
2753 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
2754 SLAB_MEM_SPREAD | extra_flags), ctor
2755#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2756 ,NULL
2757#endif
2758 );
2759}
2760
39279cc3
CM		 2761int btrfs_init_cachep(void)
2762{
86479a04 2763 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
92fee66d
CM		 2764 sizeof(struct btrfs_inode),
2765 0, init_once);
39279cc3
CM		 2766 if (!btrfs_inode_cachep)
2767 goto fail;
86479a04
CM		 2768 btrfs_trans_handle_cachep =
2769 btrfs_cache_create("btrfs_trans_handle_cache",
2770 sizeof(struct btrfs_trans_handle),
2771 0, NULL);
39279cc3
CM		 2772 if (!btrfs_trans_handle_cachep)
2773 goto fail;
86479a04 2774 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
39279cc3 2775 sizeof(struct btrfs_transaction),
92fee66d 2776 0, NULL);
39279cc3
CM		 2777 if (!btrfs_transaction_cachep)
2778 goto fail;
86479a04 2779 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
23223584 2780 sizeof(struct btrfs_path),
92fee66d 2781 0, NULL);
39279cc3
CM		 2782 if (!btrfs_path_cachep)
2783 goto fail;
86479a04 2784 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
92fee66d 2785 SLAB_DESTROY_BY_RCU, NULL);
39279cc3
CM		 2786 if (!btrfs_bit_radix_cachep)
2787 goto fail;
2788 return 0;
2789fail:
2790 btrfs_destroy_cachep();
2791 return -ENOMEM;
2792}
2793
2794static int btrfs_getattr(struct vfsmount *mnt,
2795 struct dentry *dentry, struct kstat *stat)
2796{
2797 struct inode *inode = dentry->d_inode;
2798 generic_fillattr(inode, stat);
d6667462 2799 stat->blksize = PAGE_CACHE_SIZE;
39279cc3
CM		 2800 return 0;
2801}
2802
2803static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
2804 struct inode * new_dir,struct dentry *new_dentry)
2805{
2806 struct btrfs_trans_handle *trans;
2807 struct btrfs_root *root = BTRFS_I(old_dir)->root;
2808 struct inode *new_inode = new_dentry->d_inode;
2809 struct inode *old_inode = old_dentry->d_inode;
2810 struct timespec ctime = CURRENT_TIME;
2811 struct btrfs_path *path;
39279cc3
CM		 2812 int ret;
2813
2814 if (S_ISDIR(old_inode->i_mode) && new_inode &&
2815 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
2816 return -ENOTEMPTY;
2817 }
5f39d397 2818
39279cc3 2819 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2820 ret = btrfs_check_free_space(root, 1, 0);
2821 if (ret)
2822 goto out_unlock;
2823
39279cc3 2824 trans = btrfs_start_transaction(root, 1);
5f39d397 2825
39279cc3
CM		 2826 btrfs_set_trans_block_group(trans, new_dir);
2827 path = btrfs_alloc_path();
2828 if (!path) {
2829 ret = -ENOMEM;
2830 goto out_fail;
2831 }
2832
2833 old_dentry->d_inode->i_nlink++;
2834 old_dir->i_ctime = old_dir->i_mtime = ctime;
2835 new_dir->i_ctime = new_dir->i_mtime = ctime;
2836 old_inode->i_ctime = ctime;
5f39d397 2837
39279cc3
CM		 2838 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
2839 if (ret)
2840 goto out_fail;
2841
2842 if (new_inode) {
2843 new_inode->i_ctime = CURRENT_TIME;
2844 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
2845 if (ret)
2846 goto out_fail;
39279cc3 2847 }
9c58309d 2848 ret = btrfs_add_link(trans, new_dentry, old_inode, 1);
39279cc3
CM		 2849 if (ret)
2850 goto out_fail;
2851
2852out_fail:
2853 btrfs_free_path(path);
2854 btrfs_end_transaction(trans, root);
1832a6d5 2855out_unlock:
39279cc3
CM		 2856 mutex_unlock(&root->fs_info->fs_mutex);
2857 return ret;
2858}
2859
2860static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
2861 const char *symname)
2862{
2863 struct btrfs_trans_handle *trans;
2864 struct btrfs_root *root = BTRFS_I(dir)->root;
2865 struct btrfs_path *path;
2866 struct btrfs_key key;
1832a6d5 2867 struct inode *inode = NULL;
39279cc3
CM		 2868 int err;
2869 int drop_inode = 0;
2870 u64 objectid;
2871 int name_len;
2872 int datasize;
5f39d397 2873 unsigned long ptr;
39279cc3 2874 struct btrfs_file_extent_item *ei;
5f39d397 2875 struct extent_buffer *leaf;
1832a6d5 2876 unsigned long nr = 0;
39279cc3
CM		 2877
2878 name_len = strlen(symname) + 1;
2879 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
2880 return -ENAMETOOLONG;
1832a6d5 2881
39279cc3 2882 mutex_lock(&root->fs_info->fs_mutex);
1832a6d5
CM		 2883 err = btrfs_check_free_space(root, 1, 0);
2884 if (err)
2885 goto out_fail;
2886
39279cc3
CM		 2887 trans = btrfs_start_transaction(root, 1);
2888 btrfs_set_trans_block_group(trans, dir);
2889
2890 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2891 if (err) {
2892 err = -ENOSPC;
2893 goto out_unlock;
2894 }
2895
9c58309d
CM		 2896 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
2897 dentry->d_name.len,
2898 dentry->d_parent->d_inode->i_ino, objectid,
39279cc3
CM		 2899 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
2900 err = PTR_ERR(inode);
2901 if (IS_ERR(inode))
2902 goto out_unlock;
2903
2904 btrfs_set_trans_block_group(trans, inode);
9c58309d 2905 err = btrfs_add_nondir(trans, dentry, inode, 0);
39279cc3
CM		 2906 if (err)
2907 drop_inode = 1;
2908 else {
2909 inode->i_mapping->a_ops = &btrfs_aops;
2910 inode->i_fop = &btrfs_file_operations;
2911 inode->i_op = &btrfs_file_inode_operations;
d1310b2e
CM		 2912 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
2913 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
a52d9a80 2914 inode->i_mapping, GFP_NOFS);
d1310b2e 2915 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
39279cc3
CM		 2916 }
2917 dir->i_sb->s_dirt = 1;
2918 btrfs_update_inode_block_group(trans, inode);
2919 btrfs_update_inode_block_group(trans, dir);
2920 if (drop_inode)
2921 goto out_unlock;
2922
2923 path = btrfs_alloc_path();
2924 BUG_ON(!path);
2925 key.objectid = inode->i_ino;
2926 key.offset = 0;
39279cc3
CM		 2927 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2928 datasize = btrfs_file_extent_calc_inline_size(name_len);
2929 err = btrfs_insert_empty_item(trans, root, path, &key,
2930 datasize);
54aa1f4d
CM		 2931 if (err) {
2932 drop_inode = 1;
2933 goto out_unlock;
2934 }
5f39d397
CM		 2935 leaf = path->nodes[0];
2936 ei = btrfs_item_ptr(leaf, path->slots[0],
2937 struct btrfs_file_extent_item);
2938 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
2939 btrfs_set_file_extent_type(leaf, ei,
39279cc3
CM		 2940 BTRFS_FILE_EXTENT_INLINE);
2941 ptr = btrfs_file_extent_inline_start(ei);
5f39d397
CM		 2942 write_extent_buffer(leaf, symname, ptr, name_len);
2943 btrfs_mark_buffer_dirty(leaf);
39279cc3 2944 btrfs_free_path(path);
5f39d397 2945
39279cc3
CM		 2946 inode->i_op = &btrfs_symlink_inode_operations;
2947 inode->i_mapping->a_ops = &btrfs_symlink_aops;
2948 inode->i_size = name_len - 1;
54aa1f4d
CM		 2949 err = btrfs_update_inode(trans, root, inode);
2950 if (err)
2951 drop_inode = 1;
39279cc3
CM		 2952
2953out_unlock:
d3c2fdcf 2954 nr = trans->blocks_used;
39279cc3 2955 btrfs_end_transaction(trans, root);
1832a6d5 2956out_fail:
39279cc3 2957 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 2958 if (drop_inode) {
2959 inode_dec_link_count(inode);
2960 iput(inode);
2961 }
d3c2fdcf 2962 btrfs_btree_balance_dirty(root, nr);
e2008b61 2963 btrfs_throttle(root);
39279cc3
CM		 2964 return err;
2965}
fdebe2bd
Y		 2966static int btrfs_permission(struct inode *inode, int mask,
2967 struct nameidata *nd)
2968{
2969 if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
2970 return -EACCES;
2971 return generic_permission(inode, mask, NULL);
2972}
39279cc3
CM		 2973
2974static struct inode_operations btrfs_dir_inode_operations = {
2975 .lookup = btrfs_lookup,
2976 .create = btrfs_create,
2977 .unlink = btrfs_unlink,
2978 .link = btrfs_link,
2979 .mkdir = btrfs_mkdir,
2980 .rmdir = btrfs_rmdir,
2981 .rename = btrfs_rename,
2982 .symlink = btrfs_symlink,
2983 .setattr = btrfs_setattr,
618e21d5 2984 .mknod = btrfs_mknod,
5103e947
JB		 2985 .setxattr = generic_setxattr,
2986 .getxattr = generic_getxattr,
2987 .listxattr = btrfs_listxattr,
2988 .removexattr = generic_removexattr,
fdebe2bd 2989 .permission = btrfs_permission,
39279cc3 2990};
39279cc3
CM		 2991static struct inode_operations btrfs_dir_ro_inode_operations = {
2992 .lookup = btrfs_lookup,
fdebe2bd 2993 .permission = btrfs_permission,
39279cc3 2994};
39279cc3
CM		 2995static struct file_operations btrfs_dir_file_operations = {
2996 .llseek = generic_file_llseek,
2997 .read = generic_read_dir,
2998 .readdir = btrfs_readdir,
34287aa3 2999 .unlocked_ioctl = btrfs_ioctl,
39279cc3 3000#ifdef CONFIG_COMPAT
34287aa3 3001 .compat_ioctl = btrfs_ioctl,
39279cc3
CM		 3002#endif
3003};
3004
d1310b2e 3005static struct extent_io_ops btrfs_extent_io_ops = {
07157aac
CM		 3006 .fill_delalloc = run_delalloc_range,
3007 .writepage_io_hook = btrfs_writepage_io_hook,
3008 .readpage_io_hook = btrfs_readpage_io_hook,
3009 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
b0c68f8b
CM		 3010 .set_bit_hook = btrfs_set_bit_hook,
3011 .clear_bit_hook = btrfs_clear_bit_hook,
07157aac
CM		 3012};
3013
39279cc3
CM		 3014static struct address_space_operations btrfs_aops = {
3015 .readpage = btrfs_readpage,
3016 .writepage = btrfs_writepage,
b293f02e 3017 .writepages = btrfs_writepages,
3ab2fb5a 3018 .readpages = btrfs_readpages,
39279cc3 3019 .sync_page = block_sync_page,
39279cc3 3020 .bmap = btrfs_bmap,
a52d9a80
CM		 3021 .invalidatepage = btrfs_invalidatepage,
3022 .releasepage = btrfs_releasepage,
3023 .set_page_dirty = __set_page_dirty_nobuffers,
39279cc3
CM		 3024};
3025
3026static struct address_space_operations btrfs_symlink_aops = {
3027 .readpage = btrfs_readpage,
3028 .writepage = btrfs_writepage,
2bf5a725
CM		 3029 .invalidatepage = btrfs_invalidatepage,
3030 .releasepage = btrfs_releasepage,
39279cc3
CM		 3031};
3032
3033static struct inode_operations btrfs_file_inode_operations = {
3034 .truncate = btrfs_truncate,
3035 .getattr = btrfs_getattr,
3036 .setattr = btrfs_setattr,
5103e947
JB		 3037 .setxattr = generic_setxattr,
3038 .getxattr = generic_getxattr,
3039 .listxattr = btrfs_listxattr,
3040 .removexattr = generic_removexattr,
fdebe2bd 3041 .permission = btrfs_permission,
39279cc3 3042};
618e21d5
JB		 3043static struct inode_operations btrfs_special_inode_operations = {
3044 .getattr = btrfs_getattr,
3045 .setattr = btrfs_setattr,
fdebe2bd 3046 .permission = btrfs_permission,
618e21d5 3047};
39279cc3
CM		 3048static struct inode_operations btrfs_symlink_inode_operations = {
3049 .readlink = generic_readlink,
3050 .follow_link = page_follow_link_light,
3051 .put_link = page_put_link,
fdebe2bd 3052 .permission = btrfs_permission,
39279cc3 3053};
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