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Properly align the hole size in btrfs_setattr
[deliverable/linux.git] / fs / btrfs / inode.c
1 /*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
19 #include <linux/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>
33 #include <linux/bit_spinlock.h>
34 #include <linux/version.h>
35 #include <linux/xattr.h>
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
43 struct btrfs_iget_args {
44 u64 ino;
45 struct btrfs_root *root;
46 };
47
48 static struct inode_operations btrfs_dir_inode_operations;
49 static struct inode_operations btrfs_symlink_inode_operations;
50 static struct inode_operations btrfs_dir_ro_inode_operations;
51 static struct inode_operations btrfs_special_inode_operations;
52 static struct inode_operations btrfs_file_inode_operations;
53 static struct address_space_operations btrfs_aops;
54 static struct address_space_operations btrfs_symlink_aops;
55 static struct file_operations btrfs_dir_file_operations;
56 static struct extent_io_ops btrfs_extent_io_ops;
57
58 static struct kmem_cache *btrfs_inode_cachep;
59 struct kmem_cache *btrfs_trans_handle_cachep;
60 struct kmem_cache *btrfs_transaction_cachep;
61 struct kmem_cache *btrfs_bit_radix_cachep;
62 struct kmem_cache *btrfs_path_cachep;
63
64 #define S_SHIFT 12
65 static 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
75 int 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)
84 thresh = total * 90;
85 else
86 thresh = total * 85;
87
88 do_div(thresh, 100);
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
97 static int cow_file_range(struct inode *inode, u64 start, u64 end)
98 {
99 struct btrfs_root *root = BTRFS_I(inode)->root;
100 struct btrfs_trans_handle *trans;
101 u64 alloc_hint = 0;
102 u64 num_bytes;
103 u64 cur_alloc_size;
104 u64 blocksize = root->sectorsize;
105 u64 orig_start = start;
106 u64 orig_num_bytes;
107 struct btrfs_key ins;
108 int ret;
109
110 trans = btrfs_start_transaction(root, 1);
111 BUG_ON(!trans);
112 btrfs_set_trans_block_group(trans, inode);
113
114 num_bytes = (end - start + blocksize) & ~(blocksize - 1);
115 num_bytes = max(blocksize, num_bytes);
116 ret = btrfs_drop_extents(trans, root, inode,
117 start, start + num_bytes, start, &alloc_hint);
118 orig_num_bytes = num_bytes;
119
120 if (alloc_hint == EXTENT_MAP_INLINE)
121 goto out;
122
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);
137 btrfs_check_file(root, inode);
138 num_bytes -= cur_alloc_size;
139 alloc_hint = ins.objectid + ins.offset;
140 start += cur_alloc_size;
141 }
142 btrfs_drop_extent_cache(inode, orig_start,
143 orig_start + orig_num_bytes - 1);
144 btrfs_add_ordered_inode(inode);
145 out:
146 btrfs_end_transaction(trans, root);
147 return ret;
148 }
149
150 static 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;
156 u64 loops = 0;
157 u64 total_fs_bytes;
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
167 total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
168 path = btrfs_alloc_path();
169 BUG_ON(!path);
170 again:
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) {
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;
204 err = 0;
205
206 if (loops && start != extent_start)
207 goto not_found;
208
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
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
224 if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) {
225 goto not_found;
226 }
227
228 start = extent_end;
229 } else {
230 goto not_found;
231 }
232 loop:
233 if (start > end) {
234 btrfs_free_path(path);
235 return 0;
236 }
237 btrfs_release_path(root, path);
238 loops++;
239 goto again;
240
241 not_found:
242 cow_file_range(inode, start, cow_end);
243 start = cow_end + 1;
244 goto loop;
245 }
246
247 static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
248 {
249 struct btrfs_root *root = BTRFS_I(inode)->root;
250 int ret;
251 mutex_lock(&root->fs_info->fs_mutex);
252 if (btrfs_test_opt(root, NODATACOW) ||
253 btrfs_test_flag(inode, NODATACOW))
254 ret = run_delalloc_nocow(inode, start, end);
255 else
256 ret = cow_file_range(inode, start, end);
257
258 mutex_unlock(&root->fs_info->fs_mutex);
259 return ret;
260 }
261
262 int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
263 unsigned long bits)
264 {
265 if ((bits & EXTENT_DELALLOC)) {
266 struct btrfs_root *root = BTRFS_I(inode)->root;
267 spin_lock(&root->fs_info->delalloc_lock);
268 root->fs_info->delalloc_bytes += end - start + 1;
269 spin_unlock(&root->fs_info->delalloc_lock);
270 }
271 return 0;
272 }
273
274 int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end,
275 unsigned long bits)
276 {
277 if ((bits & EXTENT_DELALLOC)) {
278 struct btrfs_root *root = BTRFS_I(inode)->root;
279 spin_lock(&root->fs_info->delalloc_lock);
280 root->fs_info->delalloc_bytes -= end - start + 1;
281 spin_unlock(&root->fs_info->delalloc_lock);
282 }
283 return 0;
284 }
285
286 int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end)
287 {
288 struct inode *inode = page->mapping->host;
289 struct btrfs_root *root = BTRFS_I(inode)->root;
290 struct btrfs_trans_handle *trans;
291 char *kaddr;
292 int ret = 0;
293 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
294 size_t offset = start - page_start;
295 if (btrfs_test_opt(root, NODATASUM) ||
296 btrfs_test_flag(inode, NODATASUM))
297 return 0;
298 mutex_lock(&root->fs_info->fs_mutex);
299 trans = btrfs_start_transaction(root, 1);
300 btrfs_set_trans_block_group(trans, inode);
301 kaddr = kmap(page);
302 btrfs_csum_file_block(trans, root, inode, inode->i_ino,
303 start, kaddr + offset, end - start + 1);
304 kunmap(page);
305 ret = btrfs_end_transaction(trans, root);
306 BUG_ON(ret);
307 mutex_unlock(&root->fs_info->fs_mutex);
308 return ret;
309 }
310
311 int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
312 {
313 int ret = 0;
314 struct inode *inode = page->mapping->host;
315 struct btrfs_root *root = BTRFS_I(inode)->root;
316 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
317 struct btrfs_csum_item *item;
318 struct btrfs_path *path = NULL;
319 u32 csum;
320 if (btrfs_test_opt(root, NODATASUM) ||
321 btrfs_test_flag(inode, NODATASUM))
322 return 0;
323 mutex_lock(&root->fs_info->fs_mutex);
324 path = btrfs_alloc_path();
325 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
326 if (IS_ERR(item)) {
327 ret = PTR_ERR(item);
328 /* a csum that isn't present is a preallocated region. */
329 if (ret == -ENOENT || ret == -EFBIG)
330 ret = 0;
331 csum = 0;
332 printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start);
333 goto out;
334 }
335 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
336 BTRFS_CRC32_SIZE);
337 set_state_private(io_tree, start, csum);
338 out:
339 if (path)
340 btrfs_free_path(path);
341 mutex_unlock(&root->fs_info->fs_mutex);
342 return ret;
343 }
344
345 int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end,
346 struct extent_state *state)
347 {
348 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
349 struct inode *inode = page->mapping->host;
350 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
351 char *kaddr;
352 u64 private = ~(u32)0;
353 int ret;
354 struct btrfs_root *root = BTRFS_I(inode)->root;
355 u32 csum = ~(u32)0;
356 unsigned long flags;
357
358 if (btrfs_test_opt(root, NODATASUM) ||
359 btrfs_test_flag(inode, NODATASUM))
360 return 0;
361
362 if (state->start == start) {
363 private = state->private;
364 ret = 0;
365 } else {
366 ret = get_state_private(io_tree, start, &private);
367 }
368 local_irq_save(flags);
369 kaddr = kmap_atomic(page, KM_IRQ0);
370 if (ret) {
371 goto zeroit;
372 }
373 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
374 btrfs_csum_final(csum, (char *)&csum);
375 if (csum != private) {
376 goto zeroit;
377 }
378 kunmap_atomic(kaddr, KM_IRQ0);
379 local_irq_restore(flags);
380 return 0;
381
382 zeroit:
383 printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n",
384 page->mapping->host->i_ino, (unsigned long long)start, csum,
385 private);
386 memset(kaddr + offset, 1, end - start + 1);
387 flush_dcache_page(page);
388 kunmap_atomic(kaddr, KM_IRQ0);
389 local_irq_restore(flags);
390 return 0;
391 }
392
393 void btrfs_read_locked_inode(struct inode *inode)
394 {
395 struct btrfs_path *path;
396 struct extent_buffer *leaf;
397 struct btrfs_inode_item *inode_item;
398 struct btrfs_inode_timespec *tspec;
399 struct btrfs_root *root = BTRFS_I(inode)->root;
400 struct btrfs_key location;
401 u64 alloc_group_block;
402 u32 rdev;
403 int ret;
404
405 path = btrfs_alloc_path();
406 BUG_ON(!path);
407 mutex_lock(&root->fs_info->fs_mutex);
408 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
409
410 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
411 if (ret)
412 goto make_bad;
413
414 leaf = path->nodes[0];
415 inode_item = btrfs_item_ptr(leaf, path->slots[0],
416 struct btrfs_inode_item);
417
418 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
419 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
420 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
421 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
422 inode->i_size = btrfs_inode_size(leaf, inode_item);
423
424 tspec = btrfs_inode_atime(inode_item);
425 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
426 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
427
428 tspec = btrfs_inode_mtime(inode_item);
429 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
430 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
431
432 tspec = btrfs_inode_ctime(inode_item);
433 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
434 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
435
436 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
437 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
438 inode->i_rdev = 0;
439 rdev = btrfs_inode_rdev(leaf, inode_item);
440
441 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
442 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
443 alloc_group_block);
444 BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
445 if (!BTRFS_I(inode)->block_group) {
446 BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
447 NULL, 0, 0, 0);
448 }
449 btrfs_free_path(path);
450 inode_item = NULL;
451
452 mutex_unlock(&root->fs_info->fs_mutex);
453
454 switch (inode->i_mode & S_IFMT) {
455 case S_IFREG:
456 inode->i_mapping->a_ops = &btrfs_aops;
457 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
458 inode->i_fop = &btrfs_file_operations;
459 inode->i_op = &btrfs_file_inode_operations;
460 break;
461 case S_IFDIR:
462 inode->i_fop = &btrfs_dir_file_operations;
463 if (root == root->fs_info->tree_root)
464 inode->i_op = &btrfs_dir_ro_inode_operations;
465 else
466 inode->i_op = &btrfs_dir_inode_operations;
467 break;
468 case S_IFLNK:
469 inode->i_op = &btrfs_symlink_inode_operations;
470 inode->i_mapping->a_ops = &btrfs_symlink_aops;
471 break;
472 default:
473 init_special_inode(inode, inode->i_mode, rdev);
474 break;
475 }
476 return;
477
478 make_bad:
479 btrfs_release_path(root, path);
480 btrfs_free_path(path);
481 mutex_unlock(&root->fs_info->fs_mutex);
482 make_bad_inode(inode);
483 }
484
485 static void fill_inode_item(struct extent_buffer *leaf,
486 struct btrfs_inode_item *item,
487 struct inode *inode)
488 {
489 btrfs_set_inode_uid(leaf, item, inode->i_uid);
490 btrfs_set_inode_gid(leaf, item, inode->i_gid);
491 btrfs_set_inode_size(leaf, item, inode->i_size);
492 btrfs_set_inode_mode(leaf, item, inode->i_mode);
493 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
494
495 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
496 inode->i_atime.tv_sec);
497 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
498 inode->i_atime.tv_nsec);
499
500 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
501 inode->i_mtime.tv_sec);
502 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
503 inode->i_mtime.tv_nsec);
504
505 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
506 inode->i_ctime.tv_sec);
507 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
508 inode->i_ctime.tv_nsec);
509
510 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
511 btrfs_set_inode_generation(leaf, item, inode->i_generation);
512 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
513 btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
514 btrfs_set_inode_block_group(leaf, item,
515 BTRFS_I(inode)->block_group->key.objectid);
516 }
517
518 int btrfs_update_inode(struct btrfs_trans_handle *trans,
519 struct btrfs_root *root,
520 struct inode *inode)
521 {
522 struct btrfs_inode_item *inode_item;
523 struct btrfs_path *path;
524 struct extent_buffer *leaf;
525 int ret;
526
527 path = btrfs_alloc_path();
528 BUG_ON(!path);
529 ret = btrfs_lookup_inode(trans, root, path,
530 &BTRFS_I(inode)->location, 1);
531 if (ret) {
532 if (ret > 0)
533 ret = -ENOENT;
534 goto failed;
535 }
536
537 leaf = path->nodes[0];
538 inode_item = btrfs_item_ptr(leaf, path->slots[0],
539 struct btrfs_inode_item);
540
541 fill_inode_item(leaf, inode_item, inode);
542 btrfs_mark_buffer_dirty(leaf);
543 btrfs_set_inode_last_trans(trans, inode);
544 ret = 0;
545 failed:
546 btrfs_release_path(root, path);
547 btrfs_free_path(path);
548 return ret;
549 }
550
551
552 static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
553 struct btrfs_root *root,
554 struct inode *dir,
555 struct dentry *dentry)
556 {
557 struct btrfs_path *path;
558 const char *name = dentry->d_name.name;
559 int name_len = dentry->d_name.len;
560 int ret = 0;
561 struct extent_buffer *leaf;
562 struct btrfs_dir_item *di;
563 struct btrfs_key key;
564
565 path = btrfs_alloc_path();
566 if (!path) {
567 ret = -ENOMEM;
568 goto err;
569 }
570
571 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
572 name, name_len, -1);
573 if (IS_ERR(di)) {
574 ret = PTR_ERR(di);
575 goto err;
576 }
577 if (!di) {
578 ret = -ENOENT;
579 goto err;
580 }
581 leaf = path->nodes[0];
582 btrfs_dir_item_key_to_cpu(leaf, di, &key);
583 ret = btrfs_delete_one_dir_name(trans, root, path, di);
584 if (ret)
585 goto err;
586 btrfs_release_path(root, path);
587
588 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
589 key.objectid, name, name_len, -1);
590 if (IS_ERR(di)) {
591 ret = PTR_ERR(di);
592 goto err;
593 }
594 if (!di) {
595 ret = -ENOENT;
596 goto err;
597 }
598 ret = btrfs_delete_one_dir_name(trans, root, path, di);
599
600 dentry->d_inode->i_ctime = dir->i_ctime;
601 ret = btrfs_del_inode_ref(trans, root, name, name_len,
602 dentry->d_inode->i_ino,
603 dentry->d_parent->d_inode->i_ino);
604 if (ret) {
605 printk("failed to delete reference to %.*s, "
606 "inode %lu parent %lu\n", name_len, name,
607 dentry->d_inode->i_ino,
608 dentry->d_parent->d_inode->i_ino);
609 }
610 err:
611 btrfs_free_path(path);
612 if (!ret) {
613 dir->i_size -= name_len * 2;
614 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
615 btrfs_update_inode(trans, root, dir);
616 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
617 dentry->d_inode->i_nlink--;
618 #else
619 drop_nlink(dentry->d_inode);
620 #endif
621 ret = btrfs_update_inode(trans, root, dentry->d_inode);
622 dir->i_sb->s_dirt = 1;
623 }
624 return ret;
625 }
626
627 static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
628 {
629 struct btrfs_root *root;
630 struct btrfs_trans_handle *trans;
631 struct inode *inode = dentry->d_inode;
632 int ret;
633 unsigned long nr = 0;
634
635 root = BTRFS_I(dir)->root;
636 mutex_lock(&root->fs_info->fs_mutex);
637
638 ret = btrfs_check_free_space(root, 1, 1);
639 if (ret)
640 goto fail;
641
642 trans = btrfs_start_transaction(root, 1);
643
644 btrfs_set_trans_block_group(trans, dir);
645 ret = btrfs_unlink_trans(trans, root, dir, dentry);
646 nr = trans->blocks_used;
647
648 if (inode->i_nlink == 0) {
649 int found;
650 /* if the inode isn't linked anywhere,
651 * we don't need to worry about
652 * data=ordered
653 */
654 found = btrfs_del_ordered_inode(inode);
655 if (found == 1) {
656 atomic_dec(&inode->i_count);
657 }
658 }
659
660 btrfs_end_transaction(trans, root);
661 fail:
662 mutex_unlock(&root->fs_info->fs_mutex);
663 btrfs_btree_balance_dirty(root, nr);
664 btrfs_throttle(root);
665 return ret;
666 }
667
668 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
669 {
670 struct inode *inode = dentry->d_inode;
671 int err = 0;
672 int ret;
673 struct btrfs_root *root = BTRFS_I(dir)->root;
674 struct btrfs_trans_handle *trans;
675 unsigned long nr = 0;
676
677 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
678 return -ENOTEMPTY;
679
680 mutex_lock(&root->fs_info->fs_mutex);
681 ret = btrfs_check_free_space(root, 1, 1);
682 if (ret)
683 goto fail;
684
685 trans = btrfs_start_transaction(root, 1);
686 btrfs_set_trans_block_group(trans, dir);
687
688 /* now the directory is empty */
689 err = btrfs_unlink_trans(trans, root, dir, dentry);
690 if (!err) {
691 inode->i_size = 0;
692 }
693
694 nr = trans->blocks_used;
695 ret = btrfs_end_transaction(trans, root);
696 fail:
697 mutex_unlock(&root->fs_info->fs_mutex);
698 btrfs_btree_balance_dirty(root, nr);
699 btrfs_throttle(root);
700
701 if (ret && !err)
702 err = ret;
703 return err;
704 }
705
706 /*
707 * this can truncate away extent items, csum items and directory items.
708 * It starts at a high offset and removes keys until it can't find
709 * any higher than i_size.
710 *
711 * csum items that cross the new i_size are truncated to the new size
712 * as well.
713 */
714 static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
715 struct btrfs_root *root,
716 struct inode *inode,
717 u32 min_type)
718 {
719 int ret;
720 struct btrfs_path *path;
721 struct btrfs_key key;
722 struct btrfs_key found_key;
723 u32 found_type;
724 struct extent_buffer *leaf;
725 struct btrfs_file_extent_item *fi;
726 u64 extent_start = 0;
727 u64 extent_num_bytes = 0;
728 u64 item_end = 0;
729 u64 root_gen = 0;
730 u64 root_owner = 0;
731 int found_extent;
732 int del_item;
733 int pending_del_nr = 0;
734 int pending_del_slot = 0;
735 int extent_type = -1;
736
737 btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1);
738 path = btrfs_alloc_path();
739 path->reada = -1;
740 BUG_ON(!path);
741
742 /* FIXME, add redo link to tree so we don't leak on crash */
743 key.objectid = inode->i_ino;
744 key.offset = (u64)-1;
745 key.type = (u8)-1;
746
747 btrfs_init_path(path);
748 search_again:
749 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
750 if (ret < 0) {
751 goto error;
752 }
753 if (ret > 0) {
754 BUG_ON(path->slots[0] == 0);
755 path->slots[0]--;
756 }
757
758 while(1) {
759 fi = NULL;
760 leaf = path->nodes[0];
761 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
762 found_type = btrfs_key_type(&found_key);
763
764 if (found_key.objectid != inode->i_ino)
765 break;
766
767 if (found_type < min_type)
768 break;
769
770 item_end = found_key.offset;
771 if (found_type == BTRFS_EXTENT_DATA_KEY) {
772 fi = btrfs_item_ptr(leaf, path->slots[0],
773 struct btrfs_file_extent_item);
774 extent_type = btrfs_file_extent_type(leaf, fi);
775 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
776 item_end +=
777 btrfs_file_extent_num_bytes(leaf, fi);
778 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
779 struct btrfs_item *item = btrfs_item_nr(leaf,
780 path->slots[0]);
781 item_end += btrfs_file_extent_inline_len(leaf,
782 item);
783 }
784 item_end--;
785 }
786 if (found_type == BTRFS_CSUM_ITEM_KEY) {
787 ret = btrfs_csum_truncate(trans, root, path,
788 inode->i_size);
789 BUG_ON(ret);
790 }
791 if (item_end < inode->i_size) {
792 if (found_type == BTRFS_DIR_ITEM_KEY) {
793 found_type = BTRFS_INODE_ITEM_KEY;
794 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
795 found_type = BTRFS_CSUM_ITEM_KEY;
796 } else if (found_type == BTRFS_EXTENT_DATA_KEY) {
797 found_type = BTRFS_XATTR_ITEM_KEY;
798 } else if (found_type == BTRFS_XATTR_ITEM_KEY) {
799 found_type = BTRFS_INODE_REF_KEY;
800 } else if (found_type) {
801 found_type--;
802 } else {
803 break;
804 }
805 btrfs_set_key_type(&key, found_type);
806 goto next;
807 }
808 if (found_key.offset >= inode->i_size)
809 del_item = 1;
810 else
811 del_item = 0;
812 found_extent = 0;
813
814 /* FIXME, shrink the extent if the ref count is only 1 */
815 if (found_type != BTRFS_EXTENT_DATA_KEY)
816 goto delete;
817
818 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
819 u64 num_dec;
820 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
821 if (!del_item) {
822 u64 orig_num_bytes =
823 btrfs_file_extent_num_bytes(leaf, fi);
824 extent_num_bytes = inode->i_size -
825 found_key.offset + root->sectorsize - 1;
826 extent_num_bytes = extent_num_bytes &
827 ~((u64)root->sectorsize - 1);
828 btrfs_set_file_extent_num_bytes(leaf, fi,
829 extent_num_bytes);
830 num_dec = (orig_num_bytes -
831 extent_num_bytes) >> 9;
832 if (extent_start != 0) {
833 inode->i_blocks -= num_dec;
834 }
835 btrfs_mark_buffer_dirty(leaf);
836 } else {
837 extent_num_bytes =
838 btrfs_file_extent_disk_num_bytes(leaf,
839 fi);
840 /* FIXME blocksize != 4096 */
841 num_dec = btrfs_file_extent_num_bytes(leaf,
842 fi) >> 9;
843 if (extent_start != 0) {
844 found_extent = 1;
845 inode->i_blocks -= num_dec;
846 }
847 root_gen = btrfs_header_generation(leaf);
848 root_owner = btrfs_header_owner(leaf);
849 }
850 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE &&
851 !del_item) {
852 u32 newsize = inode->i_size - found_key.offset;
853 newsize = btrfs_file_extent_calc_inline_size(newsize);
854 ret = btrfs_truncate_item(trans, root, path,
855 newsize, 1);
856 BUG_ON(ret);
857 }
858 delete:
859 if (del_item) {
860 if (!pending_del_nr) {
861 /* no pending yet, add ourselves */
862 pending_del_slot = path->slots[0];
863 pending_del_nr = 1;
864 } else if (pending_del_nr &&
865 path->slots[0] + 1 == pending_del_slot) {
866 /* hop on the pending chunk */
867 pending_del_nr++;
868 pending_del_slot = path->slots[0];
869 } else {
870 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot);
871 }
872 } else {
873 break;
874 }
875 if (found_extent) {
876 ret = btrfs_free_extent(trans, root, extent_start,
877 extent_num_bytes,
878 root_owner,
879 root_gen, inode->i_ino,
880 found_key.offset, 0);
881 BUG_ON(ret);
882 }
883 next:
884 if (path->slots[0] == 0) {
885 if (pending_del_nr)
886 goto del_pending;
887 btrfs_release_path(root, path);
888 goto search_again;
889 }
890
891 path->slots[0]--;
892 if (pending_del_nr &&
893 path->slots[0] + 1 != pending_del_slot) {
894 struct btrfs_key debug;
895 del_pending:
896 btrfs_item_key_to_cpu(path->nodes[0], &debug,
897 pending_del_slot);
898 ret = btrfs_del_items(trans, root, path,
899 pending_del_slot,
900 pending_del_nr);
901 BUG_ON(ret);
902 pending_del_nr = 0;
903 btrfs_release_path(root, path);
904 goto search_again;
905 }
906 }
907 ret = 0;
908 error:
909 if (pending_del_nr) {
910 ret = btrfs_del_items(trans, root, path, pending_del_slot,
911 pending_del_nr);
912 }
913 btrfs_release_path(root, path);
914 btrfs_free_path(path);
915 inode->i_sb->s_dirt = 1;
916 return ret;
917 }
918
919 static int btrfs_cow_one_page(struct inode *inode, struct page *page,
920 size_t zero_start)
921 {
922 char *kaddr;
923 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
924 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
925 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
926 int ret = 0;
927
928 WARN_ON(!PageLocked(page));
929 set_page_extent_mapped(page);
930
931 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
932 set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start,
933 page_end, GFP_NOFS);
934
935 if (zero_start != PAGE_CACHE_SIZE) {
936 kaddr = kmap(page);
937 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
938 flush_dcache_page(page);
939 kunmap(page);
940 }
941 set_page_dirty(page);
942 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
943
944 return ret;
945 }
946
947 /*
948 * taken from block_truncate_page, but does cow as it zeros out
949 * any bytes left in the last page in the file.
950 */
951 static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
952 {
953 struct inode *inode = mapping->host;
954 struct btrfs_root *root = BTRFS_I(inode)->root;
955 u32 blocksize = root->sectorsize;
956 pgoff_t index = from >> PAGE_CACHE_SHIFT;
957 unsigned offset = from & (PAGE_CACHE_SIZE-1);
958 struct page *page;
959 int ret = 0;
960 u64 page_start;
961
962 if ((offset & (blocksize - 1)) == 0)
963 goto out;
964
965 ret = -ENOMEM;
966 page = grab_cache_page(mapping, index);
967 if (!page)
968 goto out;
969 if (!PageUptodate(page)) {
970 ret = btrfs_readpage(NULL, page);
971 lock_page(page);
972 if (!PageUptodate(page)) {
973 ret = -EIO;
974 goto out;
975 }
976 }
977 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
978
979 ret = btrfs_cow_one_page(inode, page, offset);
980
981 unlock_page(page);
982 page_cache_release(page);
983 out:
984 return ret;
985 }
986
987 static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
988 {
989 struct inode *inode = dentry->d_inode;
990 int err;
991
992 err = inode_change_ok(inode, attr);
993 if (err)
994 return err;
995
996 if (S_ISREG(inode->i_mode) &&
997 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
998 struct btrfs_trans_handle *trans;
999 struct btrfs_root *root = BTRFS_I(inode)->root;
1000 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1001
1002 u64 mask = root->sectorsize - 1;
1003 u64 pos = (inode->i_size + mask) & ~mask;
1004 u64 block_end = (attr->ia_size + mask) & ~mask;
1005 u64 hole_start;
1006 u64 hole_size;
1007 u64 alloc_hint = 0;
1008
1009 if (attr->ia_size <= pos)
1010 goto out;
1011
1012 if (pos != inode->i_size)
1013 hole_start = pos + root->sectorsize;
1014 else
1015 hole_start = pos;
1016
1017 mutex_lock(&root->fs_info->fs_mutex);
1018 err = btrfs_check_free_space(root, 1, 0);
1019 mutex_unlock(&root->fs_info->fs_mutex);
1020 if (err)
1021 goto fail;
1022
1023 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1024
1025 lock_extent(io_tree, pos, block_end - 1, GFP_NOFS);
1026 hole_size = block_end - hole_start;
1027
1028 mutex_lock(&root->fs_info->fs_mutex);
1029 trans = btrfs_start_transaction(root, 1);
1030 btrfs_set_trans_block_group(trans, inode);
1031 err = btrfs_drop_extents(trans, root, inode,
1032 pos, block_end, pos,
1033 &alloc_hint);
1034
1035 if (alloc_hint != EXTENT_MAP_INLINE) {
1036 err = btrfs_insert_file_extent(trans, root,
1037 inode->i_ino,
1038 hole_start, 0, 0,
1039 hole_size);
1040 btrfs_drop_extent_cache(inode, hole_start,
1041 hole_size - 1);
1042 btrfs_check_file(root, inode);
1043 }
1044 btrfs_end_transaction(trans, root);
1045 mutex_unlock(&root->fs_info->fs_mutex);
1046 unlock_extent(io_tree, pos, block_end - 1, GFP_NOFS);
1047 if (err)
1048 return err;
1049 }
1050 out:
1051 err = inode_setattr(inode, attr);
1052 fail:
1053 return err;
1054 }
1055
1056 void btrfs_put_inode(struct inode *inode)
1057 {
1058 int ret;
1059
1060 if (!BTRFS_I(inode)->ordered_trans) {
1061 return;
1062 }
1063
1064 if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
1065 mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK))
1066 return;
1067
1068 ret = btrfs_del_ordered_inode(inode);
1069 if (ret == 1) {
1070 atomic_dec(&inode->i_count);
1071 }
1072 }
1073
1074 void btrfs_delete_inode(struct inode *inode)
1075 {
1076 struct btrfs_trans_handle *trans;
1077 struct btrfs_root *root = BTRFS_I(inode)->root;
1078 unsigned long nr;
1079 int ret;
1080
1081 truncate_inode_pages(&inode->i_data, 0);
1082 if (is_bad_inode(inode)) {
1083 goto no_delete;
1084 }
1085
1086 inode->i_size = 0;
1087 mutex_lock(&root->fs_info->fs_mutex);
1088 trans = btrfs_start_transaction(root, 1);
1089
1090 btrfs_set_trans_block_group(trans, inode);
1091 ret = btrfs_truncate_in_trans(trans, root, inode, 0);
1092 if (ret)
1093 goto no_delete_lock;
1094
1095 nr = trans->blocks_used;
1096 clear_inode(inode);
1097
1098 btrfs_end_transaction(trans, root);
1099 mutex_unlock(&root->fs_info->fs_mutex);
1100 btrfs_btree_balance_dirty(root, nr);
1101 btrfs_throttle(root);
1102 return;
1103
1104 no_delete_lock:
1105 nr = trans->blocks_used;
1106 btrfs_end_transaction(trans, root);
1107 mutex_unlock(&root->fs_info->fs_mutex);
1108 btrfs_btree_balance_dirty(root, nr);
1109 btrfs_throttle(root);
1110 no_delete:
1111 clear_inode(inode);
1112 }
1113
1114 /*
1115 * this returns the key found in the dir entry in the location pointer.
1116 * If no dir entries were found, location->objectid is 0.
1117 */
1118 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
1119 struct btrfs_key *location)
1120 {
1121 const char *name = dentry->d_name.name;
1122 int namelen = dentry->d_name.len;
1123 struct btrfs_dir_item *di;
1124 struct btrfs_path *path;
1125 struct btrfs_root *root = BTRFS_I(dir)->root;
1126 int ret = 0;
1127
1128 if (namelen == 1 && strcmp(name, ".") == 0) {
1129 location->objectid = dir->i_ino;
1130 location->type = BTRFS_INODE_ITEM_KEY;
1131 location->offset = 0;
1132 return 0;
1133 }
1134 path = btrfs_alloc_path();
1135 BUG_ON(!path);
1136
1137 if (namelen == 2 && strcmp(name, "..") == 0) {
1138 struct btrfs_key key;
1139 struct extent_buffer *leaf;
1140 u32 nritems;
1141 int slot;
1142
1143 key.objectid = dir->i_ino;
1144 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1145 key.offset = 0;
1146 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1147 BUG_ON(ret == 0);
1148 ret = 0;
1149
1150 leaf = path->nodes[0];
1151 slot = path->slots[0];
1152 nritems = btrfs_header_nritems(leaf);
1153 if (slot >= nritems)
1154 goto out_err;
1155
1156 btrfs_item_key_to_cpu(leaf, &key, slot);
1157 if (key.objectid != dir->i_ino ||
1158 key.type != BTRFS_INODE_REF_KEY) {
1159 goto out_err;
1160 }
1161 location->objectid = key.offset;
1162 location->type = BTRFS_INODE_ITEM_KEY;
1163 location->offset = 0;
1164 goto out;
1165 }
1166
1167 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1168 namelen, 0);
1169 if (IS_ERR(di))
1170 ret = PTR_ERR(di);
1171 if (!di || IS_ERR(di)) {
1172 goto out_err;
1173 }
1174 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
1175 out:
1176 btrfs_free_path(path);
1177 return ret;
1178 out_err:
1179 location->objectid = 0;
1180 goto out;
1181 }
1182
1183 /*
1184 * when we hit a tree root in a directory, the btrfs part of the inode
1185 * needs to be changed to reflect the root directory of the tree root. This
1186 * is kind of like crossing a mount point.
1187 */
1188 static int fixup_tree_root_location(struct btrfs_root *root,
1189 struct btrfs_key *location,
1190 struct btrfs_root **sub_root,
1191 struct dentry *dentry)
1192 {
1193 struct btrfs_path *path;
1194 struct btrfs_root_item *ri;
1195
1196 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1197 return 0;
1198 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1199 return 0;
1200
1201 path = btrfs_alloc_path();
1202 BUG_ON(!path);
1203 mutex_lock(&root->fs_info->fs_mutex);
1204
1205 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1206 dentry->d_name.name,
1207 dentry->d_name.len);
1208 if (IS_ERR(*sub_root))
1209 return PTR_ERR(*sub_root);
1210
1211 ri = &(*sub_root)->root_item;
1212 location->objectid = btrfs_root_dirid(ri);
1213 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1214 location->offset = 0;
1215
1216 btrfs_free_path(path);
1217 mutex_unlock(&root->fs_info->fs_mutex);
1218 return 0;
1219 }
1220
1221 static int btrfs_init_locked_inode(struct inode *inode, void *p)
1222 {
1223 struct btrfs_iget_args *args = p;
1224 inode->i_ino = args->ino;
1225 BTRFS_I(inode)->root = args->root;
1226 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1227 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1228 inode->i_mapping, GFP_NOFS);
1229 return 0;
1230 }
1231
1232 static int btrfs_find_actor(struct inode *inode, void *opaque)
1233 {
1234 struct btrfs_iget_args *args = opaque;
1235 return (args->ino == inode->i_ino &&
1236 args->root == BTRFS_I(inode)->root);
1237 }
1238
1239 struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1240 u64 root_objectid)
1241 {
1242 struct btrfs_iget_args args;
1243 args.ino = objectid;
1244 args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid);
1245
1246 if (!args.root)
1247 return NULL;
1248
1249 return ilookup5(s, objectid, btrfs_find_actor, (void *)&args);
1250 }
1251
1252 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1253 struct btrfs_root *root)
1254 {
1255 struct inode *inode;
1256 struct btrfs_iget_args args;
1257 args.ino = objectid;
1258 args.root = root;
1259
1260 inode = iget5_locked(s, objectid, btrfs_find_actor,
1261 btrfs_init_locked_inode,
1262 (void *)&args);
1263 return inode;
1264 }
1265
1266 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1267 struct nameidata *nd)
1268 {
1269 struct inode * inode;
1270 struct btrfs_inode *bi = BTRFS_I(dir);
1271 struct btrfs_root *root = bi->root;
1272 struct btrfs_root *sub_root = root;
1273 struct btrfs_key location;
1274 int ret;
1275
1276 if (dentry->d_name.len > BTRFS_NAME_LEN)
1277 return ERR_PTR(-ENAMETOOLONG);
1278
1279 mutex_lock(&root->fs_info->fs_mutex);
1280 ret = btrfs_inode_by_name(dir, dentry, &location);
1281 mutex_unlock(&root->fs_info->fs_mutex);
1282
1283 if (ret < 0)
1284 return ERR_PTR(ret);
1285
1286 inode = NULL;
1287 if (location.objectid) {
1288 ret = fixup_tree_root_location(root, &location, &sub_root,
1289 dentry);
1290 if (ret < 0)
1291 return ERR_PTR(ret);
1292 if (ret > 0)
1293 return ERR_PTR(-ENOENT);
1294 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1295 sub_root);
1296 if (!inode)
1297 return ERR_PTR(-EACCES);
1298 if (inode->i_state & I_NEW) {
1299 /* the inode and parent dir are two different roots */
1300 if (sub_root != root) {
1301 igrab(inode);
1302 sub_root->inode = inode;
1303 }
1304 BTRFS_I(inode)->root = sub_root;
1305 memcpy(&BTRFS_I(inode)->location, &location,
1306 sizeof(location));
1307 btrfs_read_locked_inode(inode);
1308 unlock_new_inode(inode);
1309 }
1310 }
1311 return d_splice_alias(inode, dentry);
1312 }
1313
1314 static unsigned char btrfs_filetype_table[] = {
1315 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1316 };
1317
1318 static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1319 {
1320 struct inode *inode = filp->f_dentry->d_inode;
1321 struct btrfs_root *root = BTRFS_I(inode)->root;
1322 struct btrfs_item *item;
1323 struct btrfs_dir_item *di;
1324 struct btrfs_key key;
1325 struct btrfs_key found_key;
1326 struct btrfs_path *path;
1327 int ret;
1328 u32 nritems;
1329 struct extent_buffer *leaf;
1330 int slot;
1331 int advance;
1332 unsigned char d_type;
1333 int over = 0;
1334 u32 di_cur;
1335 u32 di_total;
1336 u32 di_len;
1337 int key_type = BTRFS_DIR_INDEX_KEY;
1338 char tmp_name[32];
1339 char *name_ptr;
1340 int name_len;
1341
1342 /* FIXME, use a real flag for deciding about the key type */
1343 if (root->fs_info->tree_root == root)
1344 key_type = BTRFS_DIR_ITEM_KEY;
1345
1346 /* special case for "." */
1347 if (filp->f_pos == 0) {
1348 over = filldir(dirent, ".", 1,
1349 1, inode->i_ino,
1350 DT_DIR);
1351 if (over)
1352 return 0;
1353 filp->f_pos = 1;
1354 }
1355
1356 mutex_lock(&root->fs_info->fs_mutex);
1357 key.objectid = inode->i_ino;
1358 path = btrfs_alloc_path();
1359 path->reada = 2;
1360
1361 /* special case for .., just use the back ref */
1362 if (filp->f_pos == 1) {
1363 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1364 key.offset = 0;
1365 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1366 BUG_ON(ret == 0);
1367 leaf = path->nodes[0];
1368 slot = path->slots[0];
1369 nritems = btrfs_header_nritems(leaf);
1370 if (slot >= nritems) {
1371 btrfs_release_path(root, path);
1372 goto read_dir_items;
1373 }
1374 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1375 btrfs_release_path(root, path);
1376 if (found_key.objectid != key.objectid ||
1377 found_key.type != BTRFS_INODE_REF_KEY)
1378 goto read_dir_items;
1379 over = filldir(dirent, "..", 2,
1380 2, found_key.offset, DT_DIR);
1381 if (over)
1382 goto nopos;
1383 filp->f_pos = 2;
1384 }
1385
1386 read_dir_items:
1387 btrfs_set_key_type(&key, key_type);
1388 key.offset = filp->f_pos;
1389
1390 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1391 if (ret < 0)
1392 goto err;
1393 advance = 0;
1394 while(1) {
1395 leaf = path->nodes[0];
1396 nritems = btrfs_header_nritems(leaf);
1397 slot = path->slots[0];
1398 if (advance || slot >= nritems) {
1399 if (slot >= nritems -1) {
1400 ret = btrfs_next_leaf(root, path);
1401 if (ret)
1402 break;
1403 leaf = path->nodes[0];
1404 nritems = btrfs_header_nritems(leaf);
1405 slot = path->slots[0];
1406 } else {
1407 slot++;
1408 path->slots[0]++;
1409 }
1410 }
1411 advance = 1;
1412 item = btrfs_item_nr(leaf, slot);
1413 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1414
1415 if (found_key.objectid != key.objectid)
1416 break;
1417 if (btrfs_key_type(&found_key) != key_type)
1418 break;
1419 if (found_key.offset < filp->f_pos)
1420 continue;
1421
1422 filp->f_pos = found_key.offset;
1423 advance = 1;
1424 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1425 di_cur = 0;
1426 di_total = btrfs_item_size(leaf, item);
1427 while(di_cur < di_total) {
1428 struct btrfs_key location;
1429
1430 name_len = btrfs_dir_name_len(leaf, di);
1431 if (name_len < 32) {
1432 name_ptr = tmp_name;
1433 } else {
1434 name_ptr = kmalloc(name_len, GFP_NOFS);
1435 BUG_ON(!name_ptr);
1436 }
1437 read_extent_buffer(leaf, name_ptr,
1438 (unsigned long)(di + 1), name_len);
1439
1440 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1441 btrfs_dir_item_key_to_cpu(leaf, di, &location);
1442 over = filldir(dirent, name_ptr, name_len,
1443 found_key.offset,
1444 location.objectid,
1445 d_type);
1446
1447 if (name_ptr != tmp_name)
1448 kfree(name_ptr);
1449
1450 if (over)
1451 goto nopos;
1452 di_len = btrfs_dir_name_len(leaf, di) +
1453 btrfs_dir_data_len(leaf, di) +sizeof(*di);
1454 di_cur += di_len;
1455 di = (struct btrfs_dir_item *)((char *)di + di_len);
1456 }
1457 }
1458 filp->f_pos = INT_LIMIT(typeof(filp->f_pos));
1459 nopos:
1460 ret = 0;
1461 err:
1462 btrfs_release_path(root, path);
1463 btrfs_free_path(path);
1464 mutex_unlock(&root->fs_info->fs_mutex);
1465 return ret;
1466 }
1467
1468 int btrfs_write_inode(struct inode *inode, int wait)
1469 {
1470 struct btrfs_root *root = BTRFS_I(inode)->root;
1471 struct btrfs_trans_handle *trans;
1472 int ret = 0;
1473
1474 if (wait) {
1475 mutex_lock(&root->fs_info->fs_mutex);
1476 trans = btrfs_start_transaction(root, 1);
1477 btrfs_set_trans_block_group(trans, inode);
1478 ret = btrfs_commit_transaction(trans, root);
1479 mutex_unlock(&root->fs_info->fs_mutex);
1480 }
1481 return ret;
1482 }
1483
1484 /*
1485 * This is somewhat expensive, updating the tree every time the
1486 * inode changes. But, it is most likely to find the inode in cache.
1487 * FIXME, needs more benchmarking...there are no reasons other than performance
1488 * to keep or drop this code.
1489 */
1490 void btrfs_dirty_inode(struct inode *inode)
1491 {
1492 struct btrfs_root *root = BTRFS_I(inode)->root;
1493 struct btrfs_trans_handle *trans;
1494
1495 mutex_lock(&root->fs_info->fs_mutex);
1496 trans = btrfs_start_transaction(root, 1);
1497 btrfs_set_trans_block_group(trans, inode);
1498 btrfs_update_inode(trans, root, inode);
1499 btrfs_end_transaction(trans, root);
1500 mutex_unlock(&root->fs_info->fs_mutex);
1501 }
1502
1503 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1504 struct btrfs_root *root,
1505 const char *name, int name_len,
1506 u64 ref_objectid,
1507 u64 objectid,
1508 struct btrfs_block_group_cache *group,
1509 int mode)
1510 {
1511 struct inode *inode;
1512 struct btrfs_inode_item *inode_item;
1513 struct btrfs_key *location;
1514 struct btrfs_path *path;
1515 struct btrfs_inode_ref *ref;
1516 struct btrfs_key key[2];
1517 u32 sizes[2];
1518 unsigned long ptr;
1519 int ret;
1520 int owner;
1521
1522 path = btrfs_alloc_path();
1523 BUG_ON(!path);
1524
1525 inode = new_inode(root->fs_info->sb);
1526 if (!inode)
1527 return ERR_PTR(-ENOMEM);
1528
1529 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1530 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1531 inode->i_mapping, GFP_NOFS);
1532 BTRFS_I(inode)->root = root;
1533
1534 if (mode & S_IFDIR)
1535 owner = 0;
1536 else
1537 owner = 1;
1538 group = btrfs_find_block_group(root, group, 0, 0, owner);
1539 BTRFS_I(inode)->block_group = group;
1540 BTRFS_I(inode)->flags = 0;
1541
1542 key[0].objectid = objectid;
1543 btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY);
1544 key[0].offset = 0;
1545
1546 key[1].objectid = objectid;
1547 btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY);
1548 key[1].offset = ref_objectid;
1549
1550 sizes[0] = sizeof(struct btrfs_inode_item);
1551 sizes[1] = name_len + sizeof(*ref);
1552
1553 ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2);
1554 if (ret != 0)
1555 goto fail;
1556
1557 if (objectid > root->highest_inode)
1558 root->highest_inode = objectid;
1559
1560 inode->i_uid = current->fsuid;
1561 inode->i_gid = current->fsgid;
1562 inode->i_mode = mode;
1563 inode->i_ino = objectid;
1564 inode->i_blocks = 0;
1565 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1566 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1567 struct btrfs_inode_item);
1568 fill_inode_item(path->nodes[0], inode_item, inode);
1569
1570 ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
1571 struct btrfs_inode_ref);
1572 btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
1573 ptr = (unsigned long)(ref + 1);
1574 write_extent_buffer(path->nodes[0], name, ptr, name_len);
1575
1576 btrfs_mark_buffer_dirty(path->nodes[0]);
1577 btrfs_free_path(path);
1578
1579 location = &BTRFS_I(inode)->location;
1580 location->objectid = objectid;
1581 location->offset = 0;
1582 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1583
1584 insert_inode_hash(inode);
1585 return inode;
1586 fail:
1587 btrfs_free_path(path);
1588 return ERR_PTR(ret);
1589 }
1590
1591 static inline u8 btrfs_inode_type(struct inode *inode)
1592 {
1593 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1594 }
1595
1596 static int btrfs_add_link(struct btrfs_trans_handle *trans,
1597 struct dentry *dentry, struct inode *inode,
1598 int add_backref)
1599 {
1600 int ret;
1601 struct btrfs_key key;
1602 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
1603 struct inode *parent_inode;
1604
1605 key.objectid = inode->i_ino;
1606 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1607 key.offset = 0;
1608
1609 ret = btrfs_insert_dir_item(trans, root,
1610 dentry->d_name.name, dentry->d_name.len,
1611 dentry->d_parent->d_inode->i_ino,
1612 &key, btrfs_inode_type(inode));
1613 if (ret == 0) {
1614 if (add_backref) {
1615 ret = btrfs_insert_inode_ref(trans, root,
1616 dentry->d_name.name,
1617 dentry->d_name.len,
1618 inode->i_ino,
1619 dentry->d_parent->d_inode->i_ino);
1620 }
1621 parent_inode = dentry->d_parent->d_inode;
1622 parent_inode->i_size += dentry->d_name.len * 2;
1623 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
1624 ret = btrfs_update_inode(trans, root,
1625 dentry->d_parent->d_inode);
1626 }
1627 return ret;
1628 }
1629
1630 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
1631 struct dentry *dentry, struct inode *inode,
1632 int backref)
1633 {
1634 int err = btrfs_add_link(trans, dentry, inode, backref);
1635 if (!err) {
1636 d_instantiate(dentry, inode);
1637 return 0;
1638 }
1639 if (err > 0)
1640 err = -EEXIST;
1641 return err;
1642 }
1643
1644 static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1645 int mode, dev_t rdev)
1646 {
1647 struct btrfs_trans_handle *trans;
1648 struct btrfs_root *root = BTRFS_I(dir)->root;
1649 struct inode *inode = NULL;
1650 int err;
1651 int drop_inode = 0;
1652 u64 objectid;
1653 unsigned long nr = 0;
1654
1655 if (!new_valid_dev(rdev))
1656 return -EINVAL;
1657
1658 mutex_lock(&root->fs_info->fs_mutex);
1659 err = btrfs_check_free_space(root, 1, 0);
1660 if (err)
1661 goto fail;
1662
1663 trans = btrfs_start_transaction(root, 1);
1664 btrfs_set_trans_block_group(trans, dir);
1665
1666 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1667 if (err) {
1668 err = -ENOSPC;
1669 goto out_unlock;
1670 }
1671
1672 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1673 dentry->d_name.len,
1674 dentry->d_parent->d_inode->i_ino, objectid,
1675 BTRFS_I(dir)->block_group, mode);
1676 err = PTR_ERR(inode);
1677 if (IS_ERR(inode))
1678 goto out_unlock;
1679
1680 btrfs_set_trans_block_group(trans, inode);
1681 err = btrfs_add_nondir(trans, dentry, inode, 0);
1682 if (err)
1683 drop_inode = 1;
1684 else {
1685 inode->i_op = &btrfs_special_inode_operations;
1686 init_special_inode(inode, inode->i_mode, rdev);
1687 btrfs_update_inode(trans, root, inode);
1688 }
1689 dir->i_sb->s_dirt = 1;
1690 btrfs_update_inode_block_group(trans, inode);
1691 btrfs_update_inode_block_group(trans, dir);
1692 out_unlock:
1693 nr = trans->blocks_used;
1694 btrfs_end_transaction(trans, root);
1695 fail:
1696 mutex_unlock(&root->fs_info->fs_mutex);
1697
1698 if (drop_inode) {
1699 inode_dec_link_count(inode);
1700 iput(inode);
1701 }
1702 btrfs_btree_balance_dirty(root, nr);
1703 btrfs_throttle(root);
1704 return err;
1705 }
1706
1707 static int btrfs_create(struct inode *dir, struct dentry *dentry,
1708 int mode, struct nameidata *nd)
1709 {
1710 struct btrfs_trans_handle *trans;
1711 struct btrfs_root *root = BTRFS_I(dir)->root;
1712 struct inode *inode = NULL;
1713 int err;
1714 int drop_inode = 0;
1715 unsigned long nr = 0;
1716 u64 objectid;
1717
1718 mutex_lock(&root->fs_info->fs_mutex);
1719 err = btrfs_check_free_space(root, 1, 0);
1720 if (err)
1721 goto fail;
1722 trans = btrfs_start_transaction(root, 1);
1723 btrfs_set_trans_block_group(trans, dir);
1724
1725 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1726 if (err) {
1727 err = -ENOSPC;
1728 goto out_unlock;
1729 }
1730
1731 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1732 dentry->d_name.len,
1733 dentry->d_parent->d_inode->i_ino,
1734 objectid, BTRFS_I(dir)->block_group, mode);
1735 err = PTR_ERR(inode);
1736 if (IS_ERR(inode))
1737 goto out_unlock;
1738
1739 btrfs_set_trans_block_group(trans, inode);
1740 err = btrfs_add_nondir(trans, dentry, inode, 0);
1741 if (err)
1742 drop_inode = 1;
1743 else {
1744 inode->i_mapping->a_ops = &btrfs_aops;
1745 inode->i_fop = &btrfs_file_operations;
1746 inode->i_op = &btrfs_file_inode_operations;
1747 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1748 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1749 inode->i_mapping, GFP_NOFS);
1750 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
1751 }
1752 dir->i_sb->s_dirt = 1;
1753 btrfs_update_inode_block_group(trans, inode);
1754 btrfs_update_inode_block_group(trans, dir);
1755 out_unlock:
1756 nr = trans->blocks_used;
1757 btrfs_end_transaction(trans, root);
1758 fail:
1759 mutex_unlock(&root->fs_info->fs_mutex);
1760
1761 if (drop_inode) {
1762 inode_dec_link_count(inode);
1763 iput(inode);
1764 }
1765 btrfs_btree_balance_dirty(root, nr);
1766 btrfs_throttle(root);
1767 return err;
1768 }
1769
1770 static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1771 struct dentry *dentry)
1772 {
1773 struct btrfs_trans_handle *trans;
1774 struct btrfs_root *root = BTRFS_I(dir)->root;
1775 struct inode *inode = old_dentry->d_inode;
1776 unsigned long nr = 0;
1777 int err;
1778 int drop_inode = 0;
1779
1780 if (inode->i_nlink == 0)
1781 return -ENOENT;
1782
1783 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1784 inode->i_nlink++;
1785 #else
1786 inc_nlink(inode);
1787 #endif
1788 mutex_lock(&root->fs_info->fs_mutex);
1789 err = btrfs_check_free_space(root, 1, 0);
1790 if (err)
1791 goto fail;
1792 trans = btrfs_start_transaction(root, 1);
1793
1794 btrfs_set_trans_block_group(trans, dir);
1795 atomic_inc(&inode->i_count);
1796 err = btrfs_add_nondir(trans, dentry, inode, 1);
1797
1798 if (err)
1799 drop_inode = 1;
1800
1801 dir->i_sb->s_dirt = 1;
1802 btrfs_update_inode_block_group(trans, dir);
1803 err = btrfs_update_inode(trans, root, inode);
1804
1805 if (err)
1806 drop_inode = 1;
1807
1808 nr = trans->blocks_used;
1809 btrfs_end_transaction(trans, root);
1810 fail:
1811 mutex_unlock(&root->fs_info->fs_mutex);
1812
1813 if (drop_inode) {
1814 inode_dec_link_count(inode);
1815 iput(inode);
1816 }
1817 btrfs_btree_balance_dirty(root, nr);
1818 btrfs_throttle(root);
1819 return err;
1820 }
1821
1822 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1823 {
1824 struct inode *inode;
1825 struct btrfs_trans_handle *trans;
1826 struct btrfs_root *root = BTRFS_I(dir)->root;
1827 int err = 0;
1828 int drop_on_err = 0;
1829 u64 objectid;
1830 unsigned long nr = 1;
1831
1832 mutex_lock(&root->fs_info->fs_mutex);
1833 err = btrfs_check_free_space(root, 1, 0);
1834 if (err)
1835 goto out_unlock;
1836
1837 trans = btrfs_start_transaction(root, 1);
1838 btrfs_set_trans_block_group(trans, dir);
1839
1840 if (IS_ERR(trans)) {
1841 err = PTR_ERR(trans);
1842 goto out_unlock;
1843 }
1844
1845 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1846 if (err) {
1847 err = -ENOSPC;
1848 goto out_unlock;
1849 }
1850
1851 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1852 dentry->d_name.len,
1853 dentry->d_parent->d_inode->i_ino, objectid,
1854 BTRFS_I(dir)->block_group, S_IFDIR | mode);
1855 if (IS_ERR(inode)) {
1856 err = PTR_ERR(inode);
1857 goto out_fail;
1858 }
1859
1860 drop_on_err = 1;
1861 inode->i_op = &btrfs_dir_inode_operations;
1862 inode->i_fop = &btrfs_dir_file_operations;
1863 btrfs_set_trans_block_group(trans, inode);
1864
1865 inode->i_size = 0;
1866 err = btrfs_update_inode(trans, root, inode);
1867 if (err)
1868 goto out_fail;
1869
1870 err = btrfs_add_link(trans, dentry, inode, 0);
1871 if (err)
1872 goto out_fail;
1873
1874 d_instantiate(dentry, inode);
1875 drop_on_err = 0;
1876 dir->i_sb->s_dirt = 1;
1877 btrfs_update_inode_block_group(trans, inode);
1878 btrfs_update_inode_block_group(trans, dir);
1879
1880 out_fail:
1881 nr = trans->blocks_used;
1882 btrfs_end_transaction(trans, root);
1883
1884 out_unlock:
1885 mutex_unlock(&root->fs_info->fs_mutex);
1886 if (drop_on_err)
1887 iput(inode);
1888 btrfs_btree_balance_dirty(root, nr);
1889 btrfs_throttle(root);
1890 return err;
1891 }
1892
1893 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1894 size_t pg_offset, u64 start, u64 len,
1895 int create)
1896 {
1897 int ret;
1898 int err = 0;
1899 u64 bytenr;
1900 u64 extent_start = 0;
1901 u64 extent_end = 0;
1902 u64 objectid = inode->i_ino;
1903 u32 found_type;
1904 struct btrfs_path *path;
1905 struct btrfs_root *root = BTRFS_I(inode)->root;
1906 struct btrfs_file_extent_item *item;
1907 struct extent_buffer *leaf;
1908 struct btrfs_key found_key;
1909 struct extent_map *em = NULL;
1910 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1911 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1912 struct btrfs_trans_handle *trans = NULL;
1913
1914 path = btrfs_alloc_path();
1915 BUG_ON(!path);
1916 mutex_lock(&root->fs_info->fs_mutex);
1917
1918 again:
1919 spin_lock(&em_tree->lock);
1920 em = lookup_extent_mapping(em_tree, start, len);
1921 spin_unlock(&em_tree->lock);
1922
1923 if (em) {
1924 if (em->start > start) {
1925 printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n",
1926 start, len, em->start, em->len);
1927 WARN_ON(1);
1928 }
1929 if (em->block_start == EXTENT_MAP_INLINE && page)
1930 free_extent_map(em);
1931 else
1932 goto out;
1933 }
1934 em = alloc_extent_map(GFP_NOFS);
1935 if (!em) {
1936 err = -ENOMEM;
1937 goto out;
1938 }
1939
1940 em->start = EXTENT_MAP_HOLE;
1941 em->len = (u64)-1;
1942 em->bdev = inode->i_sb->s_bdev;
1943 ret = btrfs_lookup_file_extent(trans, root, path,
1944 objectid, start, trans != NULL);
1945 if (ret < 0) {
1946 err = ret;
1947 goto out;
1948 }
1949
1950 if (ret != 0) {
1951 if (path->slots[0] == 0)
1952 goto not_found;
1953 path->slots[0]--;
1954 }
1955
1956 leaf = path->nodes[0];
1957 item = btrfs_item_ptr(leaf, path->slots[0],
1958 struct btrfs_file_extent_item);
1959 /* are we inside the extent that was found? */
1960 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1961 found_type = btrfs_key_type(&found_key);
1962 if (found_key.objectid != objectid ||
1963 found_type != BTRFS_EXTENT_DATA_KEY) {
1964 goto not_found;
1965 }
1966
1967 found_type = btrfs_file_extent_type(leaf, item);
1968 extent_start = found_key.offset;
1969 if (found_type == BTRFS_FILE_EXTENT_REG) {
1970 extent_end = extent_start +
1971 btrfs_file_extent_num_bytes(leaf, item);
1972 err = 0;
1973 if (start < extent_start || start >= extent_end) {
1974 em->start = start;
1975 if (start < extent_start) {
1976 if (start + len <= extent_start)
1977 goto not_found;
1978 em->len = extent_end - extent_start;
1979 } else {
1980 em->len = len;
1981 }
1982 goto not_found_em;
1983 }
1984 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
1985 if (bytenr == 0) {
1986 em->start = extent_start;
1987 em->len = extent_end - extent_start;
1988 em->block_start = EXTENT_MAP_HOLE;
1989 goto insert;
1990 }
1991 bytenr += btrfs_file_extent_offset(leaf, item);
1992 em->block_start = bytenr;
1993 em->start = extent_start;
1994 em->len = extent_end - extent_start;
1995 goto insert;
1996 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
1997 u64 page_start;
1998 unsigned long ptr;
1999 char *map;
2000 size_t size;
2001 size_t extent_offset;
2002 size_t copy_size;
2003
2004 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
2005 path->slots[0]));
2006 extent_end = (extent_start + size + root->sectorsize - 1) &
2007 ~((u64)root->sectorsize - 1);
2008 if (start < extent_start || start >= extent_end) {
2009 em->start = start;
2010 if (start < extent_start) {
2011 if (start + len <= extent_start)
2012 goto not_found;
2013 em->len = extent_end - extent_start;
2014 } else {
2015 em->len = len;
2016 }
2017 goto not_found_em;
2018 }
2019 em->block_start = EXTENT_MAP_INLINE;
2020
2021 if (!page) {
2022 em->start = extent_start;
2023 em->len = size;
2024 goto out;
2025 }
2026
2027 page_start = page_offset(page) + pg_offset;
2028 extent_offset = page_start - extent_start;
2029 copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset,
2030 size - extent_offset);
2031 em->start = extent_start + extent_offset;
2032 em->len = (copy_size + root->sectorsize - 1) &
2033 ~((u64)root->sectorsize - 1);
2034 map = kmap(page);
2035 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
2036 if (create == 0 && !PageUptodate(page)) {
2037 read_extent_buffer(leaf, map + pg_offset, ptr,
2038 copy_size);
2039 flush_dcache_page(page);
2040 } else if (create && PageUptodate(page)) {
2041 if (!trans) {
2042 kunmap(page);
2043 free_extent_map(em);
2044 em = NULL;
2045 btrfs_release_path(root, path);
2046 trans = btrfs_start_transaction(root, 1);
2047 goto again;
2048 }
2049 write_extent_buffer(leaf, map + pg_offset, ptr,
2050 copy_size);
2051 btrfs_mark_buffer_dirty(leaf);
2052 }
2053 kunmap(page);
2054 set_extent_uptodate(io_tree, em->start,
2055 extent_map_end(em) - 1, GFP_NOFS);
2056 goto insert;
2057 } else {
2058 printk("unkknown found_type %d\n", found_type);
2059 WARN_ON(1);
2060 }
2061 not_found:
2062 em->start = start;
2063 em->len = len;
2064 not_found_em:
2065 em->block_start = EXTENT_MAP_HOLE;
2066 insert:
2067 btrfs_release_path(root, path);
2068 if (em->start > start || extent_map_end(em) <= start) {
2069 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len);
2070 err = -EIO;
2071 goto out;
2072 }
2073
2074 err = 0;
2075 spin_lock(&em_tree->lock);
2076 ret = add_extent_mapping(em_tree, em);
2077 if (ret == -EEXIST) {
2078 free_extent_map(em);
2079 em = lookup_extent_mapping(em_tree, start, len);
2080 if (!em) {
2081 err = -EIO;
2082 printk("failing to insert %Lu %Lu\n", start, len);
2083 }
2084 }
2085 spin_unlock(&em_tree->lock);
2086 out:
2087 btrfs_free_path(path);
2088 if (trans) {
2089 ret = btrfs_end_transaction(trans, root);
2090 if (!err)
2091 err = ret;
2092 }
2093 mutex_unlock(&root->fs_info->fs_mutex);
2094 if (err) {
2095 free_extent_map(em);
2096 WARN_ON(1);
2097 return ERR_PTR(err);
2098 }
2099 return em;
2100 }
2101
2102 static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
2103 {
2104 return extent_bmap(mapping, iblock, btrfs_get_extent);
2105 }
2106
2107 int btrfs_readpage(struct file *file, struct page *page)
2108 {
2109 struct extent_io_tree *tree;
2110 tree = &BTRFS_I(page->mapping->host)->io_tree;
2111 return extent_read_full_page(tree, page, btrfs_get_extent);
2112 }
2113
2114 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
2115 {
2116 struct extent_io_tree *tree;
2117
2118
2119 if (current->flags & PF_MEMALLOC) {
2120 redirty_page_for_writepage(wbc, page);
2121 unlock_page(page);
2122 return 0;
2123 }
2124 tree = &BTRFS_I(page->mapping->host)->io_tree;
2125 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
2126 }
2127
2128 static int btrfs_writepages(struct address_space *mapping,
2129 struct writeback_control *wbc)
2130 {
2131 struct extent_io_tree *tree;
2132 tree = &BTRFS_I(mapping->host)->io_tree;
2133 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
2134 }
2135
2136 static int
2137 btrfs_readpages(struct file *file, struct address_space *mapping,
2138 struct list_head *pages, unsigned nr_pages)
2139 {
2140 struct extent_io_tree *tree;
2141 tree = &BTRFS_I(mapping->host)->io_tree;
2142 return extent_readpages(tree, mapping, pages, nr_pages,
2143 btrfs_get_extent);
2144 }
2145
2146 static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
2147 {
2148 struct extent_io_tree *tree;
2149 struct extent_map_tree *map;
2150 int ret;
2151
2152 tree = &BTRFS_I(page->mapping->host)->io_tree;
2153 map = &BTRFS_I(page->mapping->host)->extent_tree;
2154 ret = try_release_extent_mapping(map, tree, page, gfp_flags);
2155 if (ret == 1) {
2156 ClearPagePrivate(page);
2157 set_page_private(page, 0);
2158 page_cache_release(page);
2159 }
2160 return ret;
2161 }
2162
2163 static void btrfs_invalidatepage(struct page *page, unsigned long offset)
2164 {
2165 struct extent_io_tree *tree;
2166
2167 tree = &BTRFS_I(page->mapping->host)->io_tree;
2168 extent_invalidatepage(tree, page, offset);
2169 btrfs_releasepage(page, GFP_NOFS);
2170 }
2171
2172 /*
2173 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2174 * called from a page fault handler when a page is first dirtied. Hence we must
2175 * be careful to check for EOF conditions here. We set the page up correctly
2176 * for a written page which means we get ENOSPC checking when writing into
2177 * holes and correct delalloc and unwritten extent mapping on filesystems that
2178 * support these features.
2179 *
2180 * We are not allowed to take the i_mutex here so we have to play games to
2181 * protect against truncate races as the page could now be beyond EOF. Because
2182 * vmtruncate() writes the inode size before removing pages, once we have the
2183 * page lock we can determine safely if the page is beyond EOF. If it is not
2184 * beyond EOF, then the page is guaranteed safe against truncation until we
2185 * unlock the page.
2186 */
2187 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
2188 {
2189 struct inode *inode = fdentry(vma->vm_file)->d_inode;
2190 struct btrfs_root *root = BTRFS_I(inode)->root;
2191 unsigned long end;
2192 loff_t size;
2193 int ret;
2194 u64 page_start;
2195
2196 mutex_lock(&root->fs_info->fs_mutex);
2197 ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
2198 mutex_unlock(&root->fs_info->fs_mutex);
2199 if (ret)
2200 goto out;
2201
2202 ret = -EINVAL;
2203
2204 lock_page(page);
2205 wait_on_page_writeback(page);
2206 size = i_size_read(inode);
2207 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2208
2209 if ((page->mapping != inode->i_mapping) ||
2210 (page_start > size)) {
2211 /* page got truncated out from underneath us */
2212 goto out_unlock;
2213 }
2214
2215 /* page is wholly or partially inside EOF */
2216 if (page_start + PAGE_CACHE_SIZE > size)
2217 end = size & ~PAGE_CACHE_MASK;
2218 else
2219 end = PAGE_CACHE_SIZE;
2220
2221 ret = btrfs_cow_one_page(inode, page, end);
2222
2223 out_unlock:
2224 unlock_page(page);
2225 out:
2226 return ret;
2227 }
2228
2229 static void btrfs_truncate(struct inode *inode)
2230 {
2231 struct btrfs_root *root = BTRFS_I(inode)->root;
2232 int ret;
2233 struct btrfs_trans_handle *trans;
2234 unsigned long nr;
2235
2236 if (!S_ISREG(inode->i_mode))
2237 return;
2238 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2239 return;
2240
2241 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2242
2243 mutex_lock(&root->fs_info->fs_mutex);
2244 trans = btrfs_start_transaction(root, 1);
2245 btrfs_set_trans_block_group(trans, inode);
2246
2247 /* FIXME, add redo link to tree so we don't leak on crash */
2248 ret = btrfs_truncate_in_trans(trans, root, inode,
2249 BTRFS_EXTENT_DATA_KEY);
2250 btrfs_update_inode(trans, root, inode);
2251 nr = trans->blocks_used;
2252
2253 ret = btrfs_end_transaction(trans, root);
2254 BUG_ON(ret);
2255 mutex_unlock(&root->fs_info->fs_mutex);
2256 btrfs_btree_balance_dirty(root, nr);
2257 btrfs_throttle(root);
2258 }
2259
2260 static int noinline create_subvol(struct btrfs_root *root, char *name,
2261 int namelen)
2262 {
2263 struct btrfs_trans_handle *trans;
2264 struct btrfs_key key;
2265 struct btrfs_root_item root_item;
2266 struct btrfs_inode_item *inode_item;
2267 struct extent_buffer *leaf;
2268 struct btrfs_root *new_root = root;
2269 struct inode *inode;
2270 struct inode *dir;
2271 int ret;
2272 int err;
2273 u64 objectid;
2274 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
2275 unsigned long nr = 1;
2276
2277 mutex_lock(&root->fs_info->fs_mutex);
2278 ret = btrfs_check_free_space(root, 1, 0);
2279 if (ret)
2280 goto fail_commit;
2281
2282 trans = btrfs_start_transaction(root, 1);
2283 BUG_ON(!trans);
2284
2285 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2286 0, &objectid);
2287 if (ret)
2288 goto fail;
2289
2290 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2291 objectid, trans->transid, 0, 0,
2292 0, 0);
2293 if (IS_ERR(leaf))
2294 return PTR_ERR(leaf);
2295
2296 btrfs_set_header_nritems(leaf, 0);
2297 btrfs_set_header_level(leaf, 0);
2298 btrfs_set_header_bytenr(leaf, leaf->start);
2299 btrfs_set_header_generation(leaf, trans->transid);
2300 btrfs_set_header_owner(leaf, objectid);
2301
2302 write_extent_buffer(leaf, root->fs_info->fsid,
2303 (unsigned long)btrfs_header_fsid(leaf),
2304 BTRFS_FSID_SIZE);
2305 btrfs_mark_buffer_dirty(leaf);
2306
2307 inode_item = &root_item.inode;
2308 memset(inode_item, 0, sizeof(*inode_item));
2309 inode_item->generation = cpu_to_le64(1);
2310 inode_item->size = cpu_to_le64(3);
2311 inode_item->nlink = cpu_to_le32(1);
2312 inode_item->nblocks = cpu_to_le64(1);
2313 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
2314
2315 btrfs_set_root_bytenr(&root_item, leaf->start);
2316 btrfs_set_root_level(&root_item, 0);
2317 btrfs_set_root_refs(&root_item, 1);
2318 btrfs_set_root_used(&root_item, 0);
2319
2320 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2321 root_item.drop_level = 0;
2322
2323 free_extent_buffer(leaf);
2324 leaf = NULL;
2325
2326 btrfs_set_root_dirid(&root_item, new_dirid);
2327
2328 key.objectid = objectid;
2329 key.offset = 1;
2330 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2331 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2332 &root_item);
2333 if (ret)
2334 goto fail;
2335
2336 /*
2337 * insert the directory item
2338 */
2339 key.offset = (u64)-1;
2340 dir = root->fs_info->sb->s_root->d_inode;
2341 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2342 name, namelen, dir->i_ino, &key,
2343 BTRFS_FT_DIR);
2344 if (ret)
2345 goto fail;
2346
2347 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2348 name, namelen, objectid,
2349 root->fs_info->sb->s_root->d_inode->i_ino);
2350 if (ret)
2351 goto fail;
2352
2353 ret = btrfs_commit_transaction(trans, root);
2354 if (ret)
2355 goto fail_commit;
2356
2357 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
2358 BUG_ON(!new_root);
2359
2360 trans = btrfs_start_transaction(new_root, 1);
2361 BUG_ON(!trans);
2362
2363 inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid,
2364 new_dirid,
2365 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
2366 if (IS_ERR(inode))
2367 goto fail;
2368 inode->i_op = &btrfs_dir_inode_operations;
2369 inode->i_fop = &btrfs_dir_file_operations;
2370 new_root->inode = inode;
2371
2372 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2373 new_dirid);
2374 inode->i_nlink = 1;
2375 inode->i_size = 0;
2376 ret = btrfs_update_inode(trans, new_root, inode);
2377 if (ret)
2378 goto fail;
2379 fail:
2380 nr = trans->blocks_used;
2381 err = btrfs_commit_transaction(trans, new_root);
2382 if (err && !ret)
2383 ret = err;
2384 fail_commit:
2385 mutex_unlock(&root->fs_info->fs_mutex);
2386 btrfs_btree_balance_dirty(root, nr);
2387 btrfs_throttle(root);
2388 return ret;
2389 }
2390
2391 static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2392 {
2393 struct btrfs_pending_snapshot *pending_snapshot;
2394 struct btrfs_trans_handle *trans;
2395 int ret;
2396 int err;
2397 unsigned long nr = 0;
2398
2399 if (!root->ref_cows)
2400 return -EINVAL;
2401
2402 mutex_lock(&root->fs_info->fs_mutex);
2403 ret = btrfs_check_free_space(root, 1, 0);
2404 if (ret)
2405 goto fail_unlock;
2406
2407 pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
2408 if (!pending_snapshot) {
2409 ret = -ENOMEM;
2410 goto fail_unlock;
2411 }
2412 pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
2413 if (!pending_snapshot->name) {
2414 ret = -ENOMEM;
2415 kfree(pending_snapshot);
2416 goto fail_unlock;
2417 }
2418 memcpy(pending_snapshot->name, name, namelen);
2419 pending_snapshot->name[namelen] = '\0';
2420 trans = btrfs_start_transaction(root, 1);
2421 BUG_ON(!trans);
2422 pending_snapshot->root = root;
2423 list_add(&pending_snapshot->list,
2424 &trans->transaction->pending_snapshots);
2425 ret = btrfs_update_inode(trans, root, root->inode);
2426 err = btrfs_commit_transaction(trans, root);
2427
2428 fail_unlock:
2429 mutex_unlock(&root->fs_info->fs_mutex);
2430 btrfs_btree_balance_dirty(root, nr);
2431 btrfs_throttle(root);
2432 return ret;
2433 }
2434
2435 unsigned long btrfs_force_ra(struct address_space *mapping,
2436 struct file_ra_state *ra, struct file *file,
2437 pgoff_t offset, pgoff_t last_index)
2438 {
2439 pgoff_t req_size;
2440
2441 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2442 req_size = last_index - offset + 1;
2443 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2444 return offset;
2445 #else
2446 req_size = min(last_index - offset + 1, (pgoff_t)128);
2447 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2448 return offset + req_size;
2449 #endif
2450 }
2451
2452 int btrfs_defrag_file(struct file *file) {
2453 struct inode *inode = fdentry(file)->d_inode;
2454 struct btrfs_root *root = BTRFS_I(inode)->root;
2455 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2456 struct page *page;
2457 unsigned long last_index;
2458 unsigned long ra_index = 0;
2459 u64 page_start;
2460 u64 page_end;
2461 unsigned long i;
2462 int ret;
2463
2464 mutex_lock(&root->fs_info->fs_mutex);
2465 ret = btrfs_check_free_space(root, inode->i_size, 0);
2466 mutex_unlock(&root->fs_info->fs_mutex);
2467 if (ret)
2468 return -ENOSPC;
2469
2470 mutex_lock(&inode->i_mutex);
2471 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2472 for (i = 0; i <= last_index; i++) {
2473 if (i == ra_index) {
2474 ra_index = btrfs_force_ra(inode->i_mapping,
2475 &file->f_ra,
2476 file, ra_index, last_index);
2477 }
2478 page = grab_cache_page(inode->i_mapping, i);
2479 if (!page)
2480 goto out_unlock;
2481 if (!PageUptodate(page)) {
2482 btrfs_readpage(NULL, page);
2483 lock_page(page);
2484 if (!PageUptodate(page)) {
2485 unlock_page(page);
2486 page_cache_release(page);
2487 goto out_unlock;
2488 }
2489 }
2490 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2491 page_end = page_start + PAGE_CACHE_SIZE - 1;
2492
2493 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
2494 set_extent_delalloc(io_tree, page_start,
2495 page_end, GFP_NOFS);
2496
2497 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
2498 set_page_dirty(page);
2499 unlock_page(page);
2500 page_cache_release(page);
2501 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2502 }
2503
2504 out_unlock:
2505 mutex_unlock(&inode->i_mutex);
2506 return 0;
2507 }
2508
2509 static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
2510 {
2511 u64 new_size;
2512 u64 old_size;
2513 struct btrfs_ioctl_vol_args *vol_args;
2514 struct btrfs_trans_handle *trans;
2515 char *sizestr;
2516 int ret = 0;
2517 int namelen;
2518 int mod = 0;
2519
2520 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2521
2522 if (!vol_args)
2523 return -ENOMEM;
2524
2525 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2526 ret = -EFAULT;
2527 goto out;
2528 }
2529 namelen = strlen(vol_args->name);
2530 if (namelen > BTRFS_VOL_NAME_MAX) {
2531 ret = -EINVAL;
2532 goto out;
2533 }
2534
2535 sizestr = vol_args->name;
2536 if (!strcmp(sizestr, "max"))
2537 new_size = root->fs_info->sb->s_bdev->bd_inode->i_size;
2538 else {
2539 if (sizestr[0] == '-') {
2540 mod = -1;
2541 sizestr++;
2542 } else if (sizestr[0] == '+') {
2543 mod = 1;
2544 sizestr++;
2545 }
2546 new_size = btrfs_parse_size(sizestr);
2547 if (new_size == 0) {
2548 ret = -EINVAL;
2549 goto out;
2550 }
2551 }
2552
2553 mutex_lock(&root->fs_info->fs_mutex);
2554 old_size = btrfs_super_total_bytes(&root->fs_info->super_copy);
2555
2556 if (mod < 0) {
2557 if (new_size > old_size) {
2558 ret = -EINVAL;
2559 goto out_unlock;
2560 }
2561 new_size = old_size - new_size;
2562 } else if (mod > 0) {
2563 new_size = old_size + new_size;
2564 }
2565
2566 if (new_size < 256 * 1024 * 1024) {
2567 ret = -EINVAL;
2568 goto out_unlock;
2569 }
2570 if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) {
2571 ret = -EFBIG;
2572 goto out_unlock;
2573 }
2574
2575 do_div(new_size, root->sectorsize);
2576 new_size *= root->sectorsize;
2577
2578 printk("new size is %Lu\n", new_size);
2579 if (new_size > old_size) {
2580 trans = btrfs_start_transaction(root, 1);
2581 ret = btrfs_grow_extent_tree(trans, root, new_size);
2582 btrfs_commit_transaction(trans, root);
2583 } else {
2584 ret = btrfs_shrink_extent_tree(root, new_size);
2585 }
2586
2587 out_unlock:
2588 mutex_unlock(&root->fs_info->fs_mutex);
2589 out:
2590 kfree(vol_args);
2591 return ret;
2592 }
2593
2594 static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root,
2595 void __user *arg)
2596 {
2597 struct btrfs_ioctl_vol_args *vol_args;
2598 struct btrfs_dir_item *di;
2599 struct btrfs_path *path;
2600 u64 root_dirid;
2601 int namelen;
2602 int ret;
2603
2604 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2605
2606 if (!vol_args)
2607 return -ENOMEM;
2608
2609 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2610 ret = -EFAULT;
2611 goto out;
2612 }
2613
2614 namelen = strlen(vol_args->name);
2615 if (namelen > BTRFS_VOL_NAME_MAX) {
2616 ret = -EINVAL;
2617 goto out;
2618 }
2619 if (strchr(vol_args->name, '/')) {
2620 ret = -EINVAL;
2621 goto out;
2622 }
2623
2624 path = btrfs_alloc_path();
2625 if (!path) {
2626 ret = -ENOMEM;
2627 goto out;
2628 }
2629
2630 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2631 mutex_lock(&root->fs_info->fs_mutex);
2632 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2633 path, root_dirid,
2634 vol_args->name, namelen, 0);
2635 mutex_unlock(&root->fs_info->fs_mutex);
2636 btrfs_free_path(path);
2637
2638 if (di && !IS_ERR(di)) {
2639 ret = -EEXIST;
2640 goto out;
2641 }
2642
2643 if (IS_ERR(di)) {
2644 ret = PTR_ERR(di);
2645 goto out;
2646 }
2647
2648 if (root == root->fs_info->tree_root)
2649 ret = create_subvol(root, vol_args->name, namelen);
2650 else
2651 ret = create_snapshot(root, vol_args->name, namelen);
2652 out:
2653 kfree(vol_args);
2654 return ret;
2655 }
2656
2657 static int btrfs_ioctl_defrag(struct file *file)
2658 {
2659 struct inode *inode = fdentry(file)->d_inode;
2660 struct btrfs_root *root = BTRFS_I(inode)->root;
2661
2662 switch (inode->i_mode & S_IFMT) {
2663 case S_IFDIR:
2664 mutex_lock(&root->fs_info->fs_mutex);
2665 btrfs_defrag_root(root, 0);
2666 btrfs_defrag_root(root->fs_info->extent_root, 0);
2667 mutex_unlock(&root->fs_info->fs_mutex);
2668 break;
2669 case S_IFREG:
2670 btrfs_defrag_file(file);
2671 break;
2672 }
2673
2674 return 0;
2675 }
2676
2677 long btrfs_ioctl(struct file *file, unsigned int
2678 cmd, unsigned long arg)
2679 {
2680 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
2681
2682 switch (cmd) {
2683 case BTRFS_IOC_SNAP_CREATE:
2684 return btrfs_ioctl_snap_create(root, (void __user *)arg);
2685 case BTRFS_IOC_DEFRAG:
2686 return btrfs_ioctl_defrag(file);
2687 case BTRFS_IOC_RESIZE:
2688 return btrfs_ioctl_resize(root, (void __user *)arg);
2689 }
2690
2691 return -ENOTTY;
2692 }
2693
2694 /*
2695 * Called inside transaction, so use GFP_NOFS
2696 */
2697 struct inode *btrfs_alloc_inode(struct super_block *sb)
2698 {
2699 struct btrfs_inode *ei;
2700
2701 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2702 if (!ei)
2703 return NULL;
2704 ei->last_trans = 0;
2705 ei->ordered_trans = 0;
2706 return &ei->vfs_inode;
2707 }
2708
2709 void btrfs_destroy_inode(struct inode *inode)
2710 {
2711 WARN_ON(!list_empty(&inode->i_dentry));
2712 WARN_ON(inode->i_data.nrpages);
2713
2714 btrfs_drop_extent_cache(inode, 0, (u64)-1);
2715 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2716 }
2717
2718 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2719 static void init_once(struct kmem_cache * cachep, void *foo)
2720 #else
2721 static void init_once(void * foo, struct kmem_cache * cachep,
2722 unsigned long flags)
2723 #endif
2724 {
2725 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2726
2727 inode_init_once(&ei->vfs_inode);
2728 }
2729
2730 void btrfs_destroy_cachep(void)
2731 {
2732 if (btrfs_inode_cachep)
2733 kmem_cache_destroy(btrfs_inode_cachep);
2734 if (btrfs_trans_handle_cachep)
2735 kmem_cache_destroy(btrfs_trans_handle_cachep);
2736 if (btrfs_transaction_cachep)
2737 kmem_cache_destroy(btrfs_transaction_cachep);
2738 if (btrfs_bit_radix_cachep)
2739 kmem_cache_destroy(btrfs_bit_radix_cachep);
2740 if (btrfs_path_cachep)
2741 kmem_cache_destroy(btrfs_path_cachep);
2742 }
2743
2744 struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
2745 unsigned long extra_flags,
2746 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2747 void (*ctor)(struct kmem_cache *, void *)
2748 #else
2749 void (*ctor)(void *, struct kmem_cache *,
2750 unsigned long)
2751 #endif
2752 )
2753 {
2754 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
2755 SLAB_MEM_SPREAD | extra_flags), ctor
2756 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2757 ,NULL
2758 #endif
2759 );
2760 }
2761
2762 int btrfs_init_cachep(void)
2763 {
2764 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
2765 sizeof(struct btrfs_inode),
2766 0, init_once);
2767 if (!btrfs_inode_cachep)
2768 goto fail;
2769 btrfs_trans_handle_cachep =
2770 btrfs_cache_create("btrfs_trans_handle_cache",
2771 sizeof(struct btrfs_trans_handle),
2772 0, NULL);
2773 if (!btrfs_trans_handle_cachep)
2774 goto fail;
2775 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
2776 sizeof(struct btrfs_transaction),
2777 0, NULL);
2778 if (!btrfs_transaction_cachep)
2779 goto fail;
2780 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
2781 sizeof(struct btrfs_path),
2782 0, NULL);
2783 if (!btrfs_path_cachep)
2784 goto fail;
2785 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
2786 SLAB_DESTROY_BY_RCU, NULL);
2787 if (!btrfs_bit_radix_cachep)
2788 goto fail;
2789 return 0;
2790 fail:
2791 btrfs_destroy_cachep();
2792 return -ENOMEM;
2793 }
2794
2795 static int btrfs_getattr(struct vfsmount *mnt,
2796 struct dentry *dentry, struct kstat *stat)
2797 {
2798 struct inode *inode = dentry->d_inode;
2799 generic_fillattr(inode, stat);
2800 stat->blksize = PAGE_CACHE_SIZE;
2801 return 0;
2802 }
2803
2804 static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
2805 struct inode * new_dir,struct dentry *new_dentry)
2806 {
2807 struct btrfs_trans_handle *trans;
2808 struct btrfs_root *root = BTRFS_I(old_dir)->root;
2809 struct inode *new_inode = new_dentry->d_inode;
2810 struct inode *old_inode = old_dentry->d_inode;
2811 struct timespec ctime = CURRENT_TIME;
2812 struct btrfs_path *path;
2813 int ret;
2814
2815 if (S_ISDIR(old_inode->i_mode) && new_inode &&
2816 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
2817 return -ENOTEMPTY;
2818 }
2819
2820 mutex_lock(&root->fs_info->fs_mutex);
2821 ret = btrfs_check_free_space(root, 1, 0);
2822 if (ret)
2823 goto out_unlock;
2824
2825 trans = btrfs_start_transaction(root, 1);
2826
2827 btrfs_set_trans_block_group(trans, new_dir);
2828 path = btrfs_alloc_path();
2829 if (!path) {
2830 ret = -ENOMEM;
2831 goto out_fail;
2832 }
2833
2834 old_dentry->d_inode->i_nlink++;
2835 old_dir->i_ctime = old_dir->i_mtime = ctime;
2836 new_dir->i_ctime = new_dir->i_mtime = ctime;
2837 old_inode->i_ctime = ctime;
2838
2839 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
2840 if (ret)
2841 goto out_fail;
2842
2843 if (new_inode) {
2844 new_inode->i_ctime = CURRENT_TIME;
2845 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
2846 if (ret)
2847 goto out_fail;
2848 }
2849 ret = btrfs_add_link(trans, new_dentry, old_inode, 1);
2850 if (ret)
2851 goto out_fail;
2852
2853 out_fail:
2854 btrfs_free_path(path);
2855 btrfs_end_transaction(trans, root);
2856 out_unlock:
2857 mutex_unlock(&root->fs_info->fs_mutex);
2858 return ret;
2859 }
2860
2861 static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
2862 const char *symname)
2863 {
2864 struct btrfs_trans_handle *trans;
2865 struct btrfs_root *root = BTRFS_I(dir)->root;
2866 struct btrfs_path *path;
2867 struct btrfs_key key;
2868 struct inode *inode = NULL;
2869 int err;
2870 int drop_inode = 0;
2871 u64 objectid;
2872 int name_len;
2873 int datasize;
2874 unsigned long ptr;
2875 struct btrfs_file_extent_item *ei;
2876 struct extent_buffer *leaf;
2877 unsigned long nr = 0;
2878
2879 name_len = strlen(symname) + 1;
2880 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
2881 return -ENAMETOOLONG;
2882
2883 mutex_lock(&root->fs_info->fs_mutex);
2884 err = btrfs_check_free_space(root, 1, 0);
2885 if (err)
2886 goto out_fail;
2887
2888 trans = btrfs_start_transaction(root, 1);
2889 btrfs_set_trans_block_group(trans, dir);
2890
2891 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2892 if (err) {
2893 err = -ENOSPC;
2894 goto out_unlock;
2895 }
2896
2897 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
2898 dentry->d_name.len,
2899 dentry->d_parent->d_inode->i_ino, objectid,
2900 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
2901 err = PTR_ERR(inode);
2902 if (IS_ERR(inode))
2903 goto out_unlock;
2904
2905 btrfs_set_trans_block_group(trans, inode);
2906 err = btrfs_add_nondir(trans, dentry, inode, 0);
2907 if (err)
2908 drop_inode = 1;
2909 else {
2910 inode->i_mapping->a_ops = &btrfs_aops;
2911 inode->i_fop = &btrfs_file_operations;
2912 inode->i_op = &btrfs_file_inode_operations;
2913 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
2914 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
2915 inode->i_mapping, GFP_NOFS);
2916 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
2917 }
2918 dir->i_sb->s_dirt = 1;
2919 btrfs_update_inode_block_group(trans, inode);
2920 btrfs_update_inode_block_group(trans, dir);
2921 if (drop_inode)
2922 goto out_unlock;
2923
2924 path = btrfs_alloc_path();
2925 BUG_ON(!path);
2926 key.objectid = inode->i_ino;
2927 key.offset = 0;
2928 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2929 datasize = btrfs_file_extent_calc_inline_size(name_len);
2930 err = btrfs_insert_empty_item(trans, root, path, &key,
2931 datasize);
2932 if (err) {
2933 drop_inode = 1;
2934 goto out_unlock;
2935 }
2936 leaf = path->nodes[0];
2937 ei = btrfs_item_ptr(leaf, path->slots[0],
2938 struct btrfs_file_extent_item);
2939 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
2940 btrfs_set_file_extent_type(leaf, ei,
2941 BTRFS_FILE_EXTENT_INLINE);
2942 ptr = btrfs_file_extent_inline_start(ei);
2943 write_extent_buffer(leaf, symname, ptr, name_len);
2944 btrfs_mark_buffer_dirty(leaf);
2945 btrfs_free_path(path);
2946
2947 inode->i_op = &btrfs_symlink_inode_operations;
2948 inode->i_mapping->a_ops = &btrfs_symlink_aops;
2949 inode->i_size = name_len - 1;
2950 err = btrfs_update_inode(trans, root, inode);
2951 if (err)
2952 drop_inode = 1;
2953
2954 out_unlock:
2955 nr = trans->blocks_used;
2956 btrfs_end_transaction(trans, root);
2957 out_fail:
2958 mutex_unlock(&root->fs_info->fs_mutex);
2959 if (drop_inode) {
2960 inode_dec_link_count(inode);
2961 iput(inode);
2962 }
2963 btrfs_btree_balance_dirty(root, nr);
2964 btrfs_throttle(root);
2965 return err;
2966 }
2967 static int btrfs_permission(struct inode *inode, int mask,
2968 struct nameidata *nd)
2969 {
2970 if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
2971 return -EACCES;
2972 return generic_permission(inode, mask, NULL);
2973 }
2974
2975 static struct inode_operations btrfs_dir_inode_operations = {
2976 .lookup = btrfs_lookup,
2977 .create = btrfs_create,
2978 .unlink = btrfs_unlink,
2979 .link = btrfs_link,
2980 .mkdir = btrfs_mkdir,
2981 .rmdir = btrfs_rmdir,
2982 .rename = btrfs_rename,
2983 .symlink = btrfs_symlink,
2984 .setattr = btrfs_setattr,
2985 .mknod = btrfs_mknod,
2986 .setxattr = generic_setxattr,
2987 .getxattr = generic_getxattr,
2988 .listxattr = btrfs_listxattr,
2989 .removexattr = generic_removexattr,
2990 .permission = btrfs_permission,
2991 };
2992 static struct inode_operations btrfs_dir_ro_inode_operations = {
2993 .lookup = btrfs_lookup,
2994 .permission = btrfs_permission,
2995 };
2996 static struct file_operations btrfs_dir_file_operations = {
2997 .llseek = generic_file_llseek,
2998 .read = generic_read_dir,
2999 .readdir = btrfs_readdir,
3000 .unlocked_ioctl = btrfs_ioctl,
3001 #ifdef CONFIG_COMPAT
3002 .compat_ioctl = btrfs_ioctl,
3003 #endif
3004 };
3005
3006 static struct extent_io_ops btrfs_extent_io_ops = {
3007 .fill_delalloc = run_delalloc_range,
3008 .writepage_io_hook = btrfs_writepage_io_hook,
3009 .readpage_io_hook = btrfs_readpage_io_hook,
3010 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
3011 };
3012
3013 static struct address_space_operations btrfs_aops = {
3014 .readpage = btrfs_readpage,
3015 .writepage = btrfs_writepage,
3016 .writepages = btrfs_writepages,
3017 .readpages = btrfs_readpages,
3018 .sync_page = block_sync_page,
3019 .bmap = btrfs_bmap,
3020 .invalidatepage = btrfs_invalidatepage,
3021 .releasepage = btrfs_releasepage,
3022 .set_page_dirty = __set_page_dirty_nobuffers,
3023 };
3024
3025 static struct address_space_operations btrfs_symlink_aops = {
3026 .readpage = btrfs_readpage,
3027 .writepage = btrfs_writepage,
3028 .invalidatepage = btrfs_invalidatepage,
3029 .releasepage = btrfs_releasepage,
3030 };
3031
3032 static struct inode_operations btrfs_file_inode_operations = {
3033 .truncate = btrfs_truncate,
3034 .getattr = btrfs_getattr,
3035 .setattr = btrfs_setattr,
3036 .setxattr = generic_setxattr,
3037 .getxattr = generic_getxattr,
3038 .listxattr = btrfs_listxattr,
3039 .removexattr = generic_removexattr,
3040 .permission = btrfs_permission,
3041 };
3042 static struct inode_operations btrfs_special_inode_operations = {
3043 .getattr = btrfs_getattr,
3044 .setattr = btrfs_setattr,
3045 .permission = btrfs_permission,
3046 };
3047 static struct inode_operations btrfs_symlink_inode_operations = {
3048 .readlink = generic_readlink,
3049 .follow_link = page_follow_link_light,
3050 .put_link = page_put_link,
3051 .permission = btrfs_permission,
3052 };
Linux kernel - Deliverables
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