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Commit | Line | Data |
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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 | ||
065631f6 | 19 | #include <linux/bio.h> |
39279cc3 CM |
20 | #include <linux/buffer_head.h> |
21 | #include <linux/fs.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/highmem.h> | |
24 | #include <linux/time.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/string.h> | |
27 | #include <linux/smp_lock.h> | |
28 | #include <linux/backing-dev.h> | |
29 | #include <linux/mpage.h> | |
30 | #include <linux/swap.h> | |
31 | #include <linux/writeback.h> | |
32 | #include <linux/statfs.h> | |
33 | #include <linux/compat.h> | |
9ebefb18 | 34 | #include <linux/bit_spinlock.h> |
92fee66d | 35 | #include <linux/version.h> |
5103e947 | 36 | #include <linux/xattr.h> |
39279cc3 CM |
37 | #include "ctree.h" |
38 | #include "disk-io.h" | |
39 | #include "transaction.h" | |
40 | #include "btrfs_inode.h" | |
41 | #include "ioctl.h" | |
42 | #include "print-tree.h" | |
43 | ||
44 | struct btrfs_iget_args { | |
45 | u64 ino; | |
46 | struct btrfs_root *root; | |
47 | }; | |
48 | ||
49 | static struct inode_operations btrfs_dir_inode_operations; | |
50 | static struct inode_operations btrfs_symlink_inode_operations; | |
51 | static struct inode_operations btrfs_dir_ro_inode_operations; | |
618e21d5 | 52 | static struct inode_operations btrfs_special_inode_operations; |
39279cc3 CM |
53 | static struct inode_operations btrfs_file_inode_operations; |
54 | static struct address_space_operations btrfs_aops; | |
55 | static struct address_space_operations btrfs_symlink_aops; | |
56 | static struct file_operations btrfs_dir_file_operations; | |
d1310b2e | 57 | static struct extent_io_ops btrfs_extent_io_ops; |
39279cc3 CM |
58 | |
59 | static struct kmem_cache *btrfs_inode_cachep; | |
60 | struct kmem_cache *btrfs_trans_handle_cachep; | |
61 | struct kmem_cache *btrfs_transaction_cachep; | |
62 | struct kmem_cache *btrfs_bit_radix_cachep; | |
63 | struct kmem_cache *btrfs_path_cachep; | |
64 | ||
65 | #define S_SHIFT 12 | |
66 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
67 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
68 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
69 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
70 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
71 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
72 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
73 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
74 | }; | |
75 | ||
1832a6d5 CM |
76 | int btrfs_check_free_space(struct btrfs_root *root, u64 num_required, |
77 | int for_del) | |
78 | { | |
79 | u64 total = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
80 | u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy); | |
81 | u64 thresh; | |
82 | int ret = 0; | |
83 | ||
84 | if (for_del) | |
f9ef6604 | 85 | thresh = total * 90; |
1832a6d5 | 86 | else |
f9ef6604 CM |
87 | thresh = total * 85; |
88 | ||
89 | do_div(thresh, 100); | |
1832a6d5 CM |
90 | |
91 | spin_lock(&root->fs_info->delalloc_lock); | |
92 | if (used + root->fs_info->delalloc_bytes + num_required > thresh) | |
93 | ret = -ENOSPC; | |
94 | spin_unlock(&root->fs_info->delalloc_lock); | |
95 | return ret; | |
96 | } | |
97 | ||
be20aa9d | 98 | static int cow_file_range(struct inode *inode, u64 start, u64 end) |
b888db2b CM |
99 | { |
100 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
101 | struct btrfs_trans_handle *trans; | |
b888db2b | 102 | u64 alloc_hint = 0; |
db94535d | 103 | u64 num_bytes; |
c59f8951 | 104 | u64 cur_alloc_size; |
db94535d | 105 | u64 blocksize = root->sectorsize; |
d1310b2e CM |
106 | u64 orig_start = start; |
107 | u64 orig_num_bytes; | |
be20aa9d CM |
108 | struct btrfs_key ins; |
109 | int ret; | |
b888db2b | 110 | |
b888db2b | 111 | trans = btrfs_start_transaction(root, 1); |
b888db2b | 112 | BUG_ON(!trans); |
be20aa9d CM |
113 | btrfs_set_trans_block_group(trans, inode); |
114 | ||
db94535d | 115 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
be20aa9d | 116 | num_bytes = max(blocksize, num_bytes); |
b888db2b | 117 | ret = btrfs_drop_extents(trans, root, inode, |
3326d1b0 | 118 | start, start + num_bytes, start, &alloc_hint); |
d1310b2e | 119 | orig_num_bytes = num_bytes; |
db94535d | 120 | |
179e29e4 CM |
121 | if (alloc_hint == EXTENT_MAP_INLINE) |
122 | goto out; | |
123 | ||
c59f8951 CM |
124 | while(num_bytes > 0) { |
125 | cur_alloc_size = min(num_bytes, root->fs_info->max_extent); | |
126 | ret = btrfs_alloc_extent(trans, root, cur_alloc_size, | |
127 | root->root_key.objectid, | |
128 | trans->transid, | |
129 | inode->i_ino, start, 0, | |
130 | alloc_hint, (u64)-1, &ins, 1); | |
131 | if (ret) { | |
132 | WARN_ON(1); | |
133 | goto out; | |
134 | } | |
135 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
136 | start, ins.objectid, ins.offset, | |
137 | ins.offset); | |
9069218d | 138 | inode->i_blocks += ins.offset >> 9; |
5f56406a | 139 | btrfs_check_file(root, inode); |
c59f8951 CM |
140 | num_bytes -= cur_alloc_size; |
141 | alloc_hint = ins.objectid + ins.offset; | |
142 | start += cur_alloc_size; | |
b888db2b | 143 | } |
d1310b2e CM |
144 | btrfs_drop_extent_cache(inode, orig_start, |
145 | orig_start + orig_num_bytes - 1); | |
dc17ff8f | 146 | btrfs_add_ordered_inode(inode); |
9069218d | 147 | btrfs_update_inode(trans, root, inode); |
b888db2b CM |
148 | out: |
149 | btrfs_end_transaction(trans, root); | |
be20aa9d CM |
150 | return ret; |
151 | } | |
152 | ||
153 | static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end) | |
154 | { | |
155 | u64 extent_start; | |
156 | u64 extent_end; | |
157 | u64 bytenr; | |
158 | u64 cow_end; | |
1832a6d5 | 159 | u64 loops = 0; |
c31f8830 | 160 | u64 total_fs_bytes; |
be20aa9d CM |
161 | struct btrfs_root *root = BTRFS_I(inode)->root; |
162 | struct extent_buffer *leaf; | |
163 | int found_type; | |
164 | struct btrfs_path *path; | |
165 | struct btrfs_file_extent_item *item; | |
166 | int ret; | |
167 | int err; | |
168 | struct btrfs_key found_key; | |
169 | ||
c31f8830 | 170 | total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
be20aa9d CM |
171 | path = btrfs_alloc_path(); |
172 | BUG_ON(!path); | |
173 | again: | |
174 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
175 | inode->i_ino, start, 0); | |
176 | if (ret < 0) { | |
177 | btrfs_free_path(path); | |
178 | return ret; | |
179 | } | |
180 | ||
181 | cow_end = end; | |
182 | if (ret != 0) { | |
183 | if (path->slots[0] == 0) | |
184 | goto not_found; | |
185 | path->slots[0]--; | |
186 | } | |
187 | ||
188 | leaf = path->nodes[0]; | |
189 | item = btrfs_item_ptr(leaf, path->slots[0], | |
190 | struct btrfs_file_extent_item); | |
191 | ||
192 | /* are we inside the extent that was found? */ | |
193 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
194 | found_type = btrfs_key_type(&found_key); | |
195 | if (found_key.objectid != inode->i_ino || | |
196 | found_type != BTRFS_EXTENT_DATA_KEY) { | |
197 | goto not_found; | |
198 | } | |
199 | ||
200 | found_type = btrfs_file_extent_type(leaf, item); | |
201 | extent_start = found_key.offset; | |
202 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
c31f8830 CM |
203 | u64 extent_num_bytes; |
204 | ||
205 | extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item); | |
206 | extent_end = extent_start + extent_num_bytes; | |
be20aa9d CM |
207 | err = 0; |
208 | ||
1832a6d5 CM |
209 | if (loops && start != extent_start) |
210 | goto not_found; | |
211 | ||
be20aa9d CM |
212 | if (start < extent_start || start >= extent_end) |
213 | goto not_found; | |
214 | ||
215 | cow_end = min(end, extent_end - 1); | |
216 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); | |
217 | if (bytenr == 0) | |
218 | goto not_found; | |
219 | ||
c31f8830 CM |
220 | /* |
221 | * we may be called by the resizer, make sure we're inside | |
222 | * the limits of the FS | |
223 | */ | |
224 | if (bytenr + extent_num_bytes > total_fs_bytes) | |
225 | goto not_found; | |
226 | ||
be20aa9d CM |
227 | if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) { |
228 | goto not_found; | |
229 | } | |
230 | ||
231 | start = extent_end; | |
bd09835d | 232 | } else { |
be20aa9d CM |
233 | goto not_found; |
234 | } | |
235 | loop: | |
236 | if (start > end) { | |
237 | btrfs_free_path(path); | |
238 | return 0; | |
239 | } | |
240 | btrfs_release_path(root, path); | |
1832a6d5 | 241 | loops++; |
be20aa9d CM |
242 | goto again; |
243 | ||
244 | not_found: | |
245 | cow_file_range(inode, start, cow_end); | |
246 | start = cow_end + 1; | |
247 | goto loop; | |
248 | } | |
249 | ||
250 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) | |
251 | { | |
252 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
253 | int ret; | |
be20aa9d | 254 | mutex_lock(&root->fs_info->fs_mutex); |
b98b6767 Y |
255 | if (btrfs_test_opt(root, NODATACOW) || |
256 | btrfs_test_flag(inode, NODATACOW)) | |
be20aa9d CM |
257 | ret = run_delalloc_nocow(inode, start, end); |
258 | else | |
259 | ret = cow_file_range(inode, start, end); | |
1832a6d5 | 260 | |
b888db2b CM |
261 | mutex_unlock(&root->fs_info->fs_mutex); |
262 | return ret; | |
263 | } | |
264 | ||
291d673e | 265 | int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end, |
b0c68f8b | 266 | unsigned long old, unsigned long bits) |
291d673e | 267 | { |
b0c68f8b | 268 | if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
291d673e CM |
269 | struct btrfs_root *root = BTRFS_I(inode)->root; |
270 | spin_lock(&root->fs_info->delalloc_lock); | |
9069218d | 271 | BTRFS_I(inode)->delalloc_bytes += end - start + 1; |
291d673e CM |
272 | root->fs_info->delalloc_bytes += end - start + 1; |
273 | spin_unlock(&root->fs_info->delalloc_lock); | |
274 | } | |
275 | return 0; | |
276 | } | |
277 | ||
278 | int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end, | |
b0c68f8b | 279 | unsigned long old, unsigned long bits) |
291d673e | 280 | { |
b0c68f8b | 281 | if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
291d673e CM |
282 | struct btrfs_root *root = BTRFS_I(inode)->root; |
283 | spin_lock(&root->fs_info->delalloc_lock); | |
b0c68f8b CM |
284 | if (end - start + 1 > root->fs_info->delalloc_bytes) { |
285 | printk("warning: delalloc account %Lu %Lu\n", | |
286 | end - start + 1, root->fs_info->delalloc_bytes); | |
287 | root->fs_info->delalloc_bytes = 0; | |
9069218d | 288 | BTRFS_I(inode)->delalloc_bytes = 0; |
b0c68f8b CM |
289 | } else { |
290 | root->fs_info->delalloc_bytes -= end - start + 1; | |
9069218d | 291 | BTRFS_I(inode)->delalloc_bytes -= end - start + 1; |
b0c68f8b | 292 | } |
291d673e CM |
293 | spin_unlock(&root->fs_info->delalloc_lock); |
294 | } | |
295 | return 0; | |
296 | } | |
297 | ||
065631f6 CM |
298 | int btrfs_submit_bio_hook(int rw, struct bio *bio) |
299 | { | |
065631f6 CM |
300 | struct bio_vec *bvec = bio->bi_io_vec; |
301 | struct inode *inode = bvec->bv_page->mapping->host; | |
302 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
303 | struct btrfs_trans_handle *trans; | |
304 | int ret = 0; | |
305 | ||
306 | if (rw != WRITE) | |
307 | return 0; | |
308 | ||
309 | if (btrfs_test_opt(root, NODATASUM) || | |
310 | btrfs_test_flag(inode, NODATASUM)) | |
311 | return 0; | |
312 | ||
313 | mutex_lock(&root->fs_info->fs_mutex); | |
314 | trans = btrfs_start_transaction(root, 1); | |
315 | btrfs_set_trans_block_group(trans, inode); | |
316 | btrfs_csum_file_blocks(trans, root, inode, bio); | |
317 | ret = btrfs_end_transaction(trans, root); | |
318 | BUG_ON(ret); | |
319 | mutex_unlock(&root->fs_info->fs_mutex); | |
320 | return ret; | |
321 | } | |
6885f308 | 322 | |
07157aac CM |
323 | int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) |
324 | { | |
325 | int ret = 0; | |
326 | struct inode *inode = page->mapping->host; | |
327 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 328 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac CM |
329 | struct btrfs_csum_item *item; |
330 | struct btrfs_path *path = NULL; | |
ff79f819 | 331 | u32 csum; |
b98b6767 Y |
332 | if (btrfs_test_opt(root, NODATASUM) || |
333 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 334 | return 0; |
07157aac CM |
335 | mutex_lock(&root->fs_info->fs_mutex); |
336 | path = btrfs_alloc_path(); | |
337 | item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0); | |
338 | if (IS_ERR(item)) { | |
339 | ret = PTR_ERR(item); | |
340 | /* a csum that isn't present is a preallocated region. */ | |
341 | if (ret == -ENOENT || ret == -EFBIG) | |
342 | ret = 0; | |
ff79f819 | 343 | csum = 0; |
aadfeb6e | 344 | printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start); |
07157aac CM |
345 | goto out; |
346 | } | |
ff79f819 CM |
347 | read_extent_buffer(path->nodes[0], &csum, (unsigned long)item, |
348 | BTRFS_CRC32_SIZE); | |
d1310b2e | 349 | set_state_private(io_tree, start, csum); |
07157aac CM |
350 | out: |
351 | if (path) | |
352 | btrfs_free_path(path); | |
353 | mutex_unlock(&root->fs_info->fs_mutex); | |
354 | return ret; | |
355 | } | |
356 | ||
70dec807 CM |
357 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
358 | struct extent_state *state) | |
07157aac | 359 | { |
35ebb934 | 360 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 361 | struct inode *inode = page->mapping->host; |
d1310b2e | 362 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac | 363 | char *kaddr; |
aadfeb6e | 364 | u64 private = ~(u32)0; |
07157aac | 365 | int ret; |
ff79f819 CM |
366 | struct btrfs_root *root = BTRFS_I(inode)->root; |
367 | u32 csum = ~(u32)0; | |
bbf0d006 | 368 | unsigned long flags; |
d1310b2e | 369 | |
b98b6767 Y |
370 | if (btrfs_test_opt(root, NODATASUM) || |
371 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 372 | return 0; |
c2e639f0 | 373 | if (state && state->start == start) { |
70dec807 CM |
374 | private = state->private; |
375 | ret = 0; | |
376 | } else { | |
377 | ret = get_state_private(io_tree, start, &private); | |
378 | } | |
bbf0d006 | 379 | local_irq_save(flags); |
07157aac CM |
380 | kaddr = kmap_atomic(page, KM_IRQ0); |
381 | if (ret) { | |
382 | goto zeroit; | |
383 | } | |
ff79f819 CM |
384 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
385 | btrfs_csum_final(csum, (char *)&csum); | |
386 | if (csum != private) { | |
07157aac CM |
387 | goto zeroit; |
388 | } | |
389 | kunmap_atomic(kaddr, KM_IRQ0); | |
bbf0d006 | 390 | local_irq_restore(flags); |
07157aac CM |
391 | return 0; |
392 | ||
393 | zeroit: | |
aadfeb6e CM |
394 | printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n", |
395 | page->mapping->host->i_ino, (unsigned long long)start, csum, | |
396 | private); | |
db94535d CM |
397 | memset(kaddr + offset, 1, end - start + 1); |
398 | flush_dcache_page(page); | |
07157aac | 399 | kunmap_atomic(kaddr, KM_IRQ0); |
bbf0d006 | 400 | local_irq_restore(flags); |
07157aac CM |
401 | return 0; |
402 | } | |
b888db2b | 403 | |
39279cc3 CM |
404 | void btrfs_read_locked_inode(struct inode *inode) |
405 | { | |
406 | struct btrfs_path *path; | |
5f39d397 | 407 | struct extent_buffer *leaf; |
39279cc3 | 408 | struct btrfs_inode_item *inode_item; |
5f39d397 | 409 | struct btrfs_inode_timespec *tspec; |
39279cc3 CM |
410 | struct btrfs_root *root = BTRFS_I(inode)->root; |
411 | struct btrfs_key location; | |
412 | u64 alloc_group_block; | |
618e21d5 | 413 | u32 rdev; |
39279cc3 CM |
414 | int ret; |
415 | ||
416 | path = btrfs_alloc_path(); | |
417 | BUG_ON(!path); | |
39279cc3 | 418 | mutex_lock(&root->fs_info->fs_mutex); |
39279cc3 | 419 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
dc17ff8f | 420 | |
39279cc3 | 421 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
5f39d397 | 422 | if (ret) |
39279cc3 | 423 | goto make_bad; |
39279cc3 | 424 | |
5f39d397 CM |
425 | leaf = path->nodes[0]; |
426 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
427 | struct btrfs_inode_item); | |
428 | ||
429 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
430 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
431 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
432 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
433 | inode->i_size = btrfs_inode_size(leaf, inode_item); | |
434 | ||
435 | tspec = btrfs_inode_atime(inode_item); | |
436 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
437 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
438 | ||
439 | tspec = btrfs_inode_mtime(inode_item); | |
440 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
441 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
442 | ||
443 | tspec = btrfs_inode_ctime(inode_item); | |
444 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
445 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
446 | ||
447 | inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item); | |
448 | inode->i_generation = btrfs_inode_generation(leaf, inode_item); | |
618e21d5 | 449 | inode->i_rdev = 0; |
5f39d397 CM |
450 | rdev = btrfs_inode_rdev(leaf, inode_item); |
451 | ||
452 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); | |
39279cc3 CM |
453 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
454 | alloc_group_block); | |
b98b6767 | 455 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); |
e52ec0eb CM |
456 | if (!BTRFS_I(inode)->block_group) { |
457 | BTRFS_I(inode)->block_group = btrfs_find_block_group(root, | |
458 | NULL, 0, 0, 0); | |
459 | } | |
39279cc3 CM |
460 | btrfs_free_path(path); |
461 | inode_item = NULL; | |
462 | ||
463 | mutex_unlock(&root->fs_info->fs_mutex); | |
464 | ||
465 | switch (inode->i_mode & S_IFMT) { | |
39279cc3 CM |
466 | case S_IFREG: |
467 | inode->i_mapping->a_ops = &btrfs_aops; | |
d1310b2e | 468 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
469 | inode->i_fop = &btrfs_file_operations; |
470 | inode->i_op = &btrfs_file_inode_operations; | |
471 | break; | |
472 | case S_IFDIR: | |
473 | inode->i_fop = &btrfs_dir_file_operations; | |
474 | if (root == root->fs_info->tree_root) | |
475 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
476 | else | |
477 | inode->i_op = &btrfs_dir_inode_operations; | |
478 | break; | |
479 | case S_IFLNK: | |
480 | inode->i_op = &btrfs_symlink_inode_operations; | |
481 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
482 | break; | |
618e21d5 JB |
483 | default: |
484 | init_special_inode(inode, inode->i_mode, rdev); | |
485 | break; | |
39279cc3 CM |
486 | } |
487 | return; | |
488 | ||
489 | make_bad: | |
490 | btrfs_release_path(root, path); | |
491 | btrfs_free_path(path); | |
492 | mutex_unlock(&root->fs_info->fs_mutex); | |
493 | make_bad_inode(inode); | |
494 | } | |
495 | ||
5f39d397 CM |
496 | static void fill_inode_item(struct extent_buffer *leaf, |
497 | struct btrfs_inode_item *item, | |
39279cc3 CM |
498 | struct inode *inode) |
499 | { | |
5f39d397 CM |
500 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
501 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
502 | btrfs_set_inode_size(leaf, item, inode->i_size); | |
503 | btrfs_set_inode_mode(leaf, item, inode->i_mode); | |
504 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
505 | ||
506 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
507 | inode->i_atime.tv_sec); | |
508 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
509 | inode->i_atime.tv_nsec); | |
510 | ||
511 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
512 | inode->i_mtime.tv_sec); | |
513 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
514 | inode->i_mtime.tv_nsec); | |
515 | ||
516 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
517 | inode->i_ctime.tv_sec); | |
518 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
519 | inode->i_ctime.tv_nsec); | |
520 | ||
521 | btrfs_set_inode_nblocks(leaf, item, inode->i_blocks); | |
522 | btrfs_set_inode_generation(leaf, item, inode->i_generation); | |
523 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); | |
b98b6767 | 524 | btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags); |
5f39d397 | 525 | btrfs_set_inode_block_group(leaf, item, |
39279cc3 CM |
526 | BTRFS_I(inode)->block_group->key.objectid); |
527 | } | |
528 | ||
a52d9a80 | 529 | int btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
530 | struct btrfs_root *root, |
531 | struct inode *inode) | |
532 | { | |
533 | struct btrfs_inode_item *inode_item; | |
534 | struct btrfs_path *path; | |
5f39d397 | 535 | struct extent_buffer *leaf; |
39279cc3 CM |
536 | int ret; |
537 | ||
538 | path = btrfs_alloc_path(); | |
539 | BUG_ON(!path); | |
39279cc3 CM |
540 | ret = btrfs_lookup_inode(trans, root, path, |
541 | &BTRFS_I(inode)->location, 1); | |
542 | if (ret) { | |
543 | if (ret > 0) | |
544 | ret = -ENOENT; | |
545 | goto failed; | |
546 | } | |
547 | ||
5f39d397 CM |
548 | leaf = path->nodes[0]; |
549 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
550 | struct btrfs_inode_item); |
551 | ||
5f39d397 CM |
552 | fill_inode_item(leaf, inode_item, inode); |
553 | btrfs_mark_buffer_dirty(leaf); | |
15ee9bc7 | 554 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
555 | ret = 0; |
556 | failed: | |
557 | btrfs_release_path(root, path); | |
558 | btrfs_free_path(path); | |
559 | return ret; | |
560 | } | |
561 | ||
562 | ||
563 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
564 | struct btrfs_root *root, | |
565 | struct inode *dir, | |
566 | struct dentry *dentry) | |
567 | { | |
568 | struct btrfs_path *path; | |
569 | const char *name = dentry->d_name.name; | |
570 | int name_len = dentry->d_name.len; | |
571 | int ret = 0; | |
5f39d397 | 572 | struct extent_buffer *leaf; |
39279cc3 | 573 | struct btrfs_dir_item *di; |
5f39d397 | 574 | struct btrfs_key key; |
39279cc3 CM |
575 | |
576 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
577 | if (!path) { |
578 | ret = -ENOMEM; | |
579 | goto err; | |
580 | } | |
581 | ||
39279cc3 CM |
582 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
583 | name, name_len, -1); | |
584 | if (IS_ERR(di)) { | |
585 | ret = PTR_ERR(di); | |
586 | goto err; | |
587 | } | |
588 | if (!di) { | |
589 | ret = -ENOENT; | |
590 | goto err; | |
591 | } | |
5f39d397 CM |
592 | leaf = path->nodes[0]; |
593 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 594 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
595 | if (ret) |
596 | goto err; | |
39279cc3 CM |
597 | btrfs_release_path(root, path); |
598 | ||
599 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
5f39d397 | 600 | key.objectid, name, name_len, -1); |
39279cc3 CM |
601 | if (IS_ERR(di)) { |
602 | ret = PTR_ERR(di); | |
603 | goto err; | |
604 | } | |
605 | if (!di) { | |
606 | ret = -ENOENT; | |
607 | goto err; | |
608 | } | |
609 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
39279cc3 CM |
610 | |
611 | dentry->d_inode->i_ctime = dir->i_ctime; | |
76fea00a CM |
612 | ret = btrfs_del_inode_ref(trans, root, name, name_len, |
613 | dentry->d_inode->i_ino, | |
614 | dentry->d_parent->d_inode->i_ino); | |
615 | if (ret) { | |
616 | printk("failed to delete reference to %.*s, " | |
617 | "inode %lu parent %lu\n", name_len, name, | |
618 | dentry->d_inode->i_ino, | |
619 | dentry->d_parent->d_inode->i_ino); | |
3954401f | 620 | } |
39279cc3 CM |
621 | err: |
622 | btrfs_free_path(path); | |
623 | if (!ret) { | |
624 | dir->i_size -= name_len * 2; | |
79c44584 | 625 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 | 626 | btrfs_update_inode(trans, root, dir); |
6da6abae CM |
627 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
628 | dentry->d_inode->i_nlink--; | |
629 | #else | |
39279cc3 | 630 | drop_nlink(dentry->d_inode); |
6da6abae | 631 | #endif |
54aa1f4d | 632 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
633 | dir->i_sb->s_dirt = 1; |
634 | } | |
635 | return ret; | |
636 | } | |
637 | ||
638 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
639 | { | |
640 | struct btrfs_root *root; | |
641 | struct btrfs_trans_handle *trans; | |
2da98f00 | 642 | struct inode *inode = dentry->d_inode; |
39279cc3 | 643 | int ret; |
1832a6d5 | 644 | unsigned long nr = 0; |
39279cc3 CM |
645 | |
646 | root = BTRFS_I(dir)->root; | |
647 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
648 | |
649 | ret = btrfs_check_free_space(root, 1, 1); | |
650 | if (ret) | |
651 | goto fail; | |
652 | ||
39279cc3 | 653 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 654 | |
39279cc3 CM |
655 | btrfs_set_trans_block_group(trans, dir); |
656 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
d3c2fdcf | 657 | nr = trans->blocks_used; |
5f39d397 | 658 | |
2da98f00 CM |
659 | if (inode->i_nlink == 0) { |
660 | int found; | |
661 | /* if the inode isn't linked anywhere, | |
662 | * we don't need to worry about | |
663 | * data=ordered | |
664 | */ | |
665 | found = btrfs_del_ordered_inode(inode); | |
666 | if (found == 1) { | |
667 | atomic_dec(&inode->i_count); | |
668 | } | |
669 | } | |
670 | ||
39279cc3 | 671 | btrfs_end_transaction(trans, root); |
1832a6d5 | 672 | fail: |
39279cc3 | 673 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 674 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 675 | btrfs_throttle(root); |
39279cc3 CM |
676 | return ret; |
677 | } | |
678 | ||
679 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
680 | { | |
681 | struct inode *inode = dentry->d_inode; | |
1832a6d5 | 682 | int err = 0; |
39279cc3 CM |
683 | int ret; |
684 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
39279cc3 | 685 | struct btrfs_trans_handle *trans; |
1832a6d5 | 686 | unsigned long nr = 0; |
39279cc3 | 687 | |
134d4512 Y |
688 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
689 | return -ENOTEMPTY; | |
690 | ||
39279cc3 | 691 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
692 | ret = btrfs_check_free_space(root, 1, 1); |
693 | if (ret) | |
694 | goto fail; | |
695 | ||
39279cc3 CM |
696 | trans = btrfs_start_transaction(root, 1); |
697 | btrfs_set_trans_block_group(trans, dir); | |
39279cc3 CM |
698 | |
699 | /* now the directory is empty */ | |
700 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
701 | if (!err) { | |
702 | inode->i_size = 0; | |
703 | } | |
3954401f | 704 | |
d3c2fdcf | 705 | nr = trans->blocks_used; |
39279cc3 | 706 | ret = btrfs_end_transaction(trans, root); |
1832a6d5 | 707 | fail: |
134d4512 | 708 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 709 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 710 | btrfs_throttle(root); |
3954401f | 711 | |
39279cc3 CM |
712 | if (ret && !err) |
713 | err = ret; | |
714 | return err; | |
715 | } | |
716 | ||
39279cc3 CM |
717 | /* |
718 | * this can truncate away extent items, csum items and directory items. | |
719 | * It starts at a high offset and removes keys until it can't find | |
720 | * any higher than i_size. | |
721 | * | |
722 | * csum items that cross the new i_size are truncated to the new size | |
723 | * as well. | |
724 | */ | |
725 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
726 | struct btrfs_root *root, | |
85e21bac CM |
727 | struct inode *inode, |
728 | u32 min_type) | |
39279cc3 CM |
729 | { |
730 | int ret; | |
731 | struct btrfs_path *path; | |
732 | struct btrfs_key key; | |
5f39d397 | 733 | struct btrfs_key found_key; |
39279cc3 | 734 | u32 found_type; |
5f39d397 | 735 | struct extent_buffer *leaf; |
39279cc3 CM |
736 | struct btrfs_file_extent_item *fi; |
737 | u64 extent_start = 0; | |
db94535d | 738 | u64 extent_num_bytes = 0; |
39279cc3 | 739 | u64 item_end = 0; |
7bb86316 | 740 | u64 root_gen = 0; |
d8d5f3e1 | 741 | u64 root_owner = 0; |
39279cc3 CM |
742 | int found_extent; |
743 | int del_item; | |
85e21bac CM |
744 | int pending_del_nr = 0; |
745 | int pending_del_slot = 0; | |
179e29e4 | 746 | int extent_type = -1; |
39279cc3 | 747 | |
a52d9a80 | 748 | btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1); |
39279cc3 | 749 | path = btrfs_alloc_path(); |
3c69faec | 750 | path->reada = -1; |
39279cc3 | 751 | BUG_ON(!path); |
5f39d397 | 752 | |
39279cc3 CM |
753 | /* FIXME, add redo link to tree so we don't leak on crash */ |
754 | key.objectid = inode->i_ino; | |
755 | key.offset = (u64)-1; | |
5f39d397 CM |
756 | key.type = (u8)-1; |
757 | ||
85e21bac CM |
758 | btrfs_init_path(path); |
759 | search_again: | |
760 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
761 | if (ret < 0) { | |
762 | goto error; | |
763 | } | |
764 | if (ret > 0) { | |
765 | BUG_ON(path->slots[0] == 0); | |
766 | path->slots[0]--; | |
767 | } | |
768 | ||
39279cc3 | 769 | while(1) { |
39279cc3 | 770 | fi = NULL; |
5f39d397 CM |
771 | leaf = path->nodes[0]; |
772 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
773 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 774 | |
5f39d397 | 775 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 776 | break; |
5f39d397 | 777 | |
85e21bac | 778 | if (found_type < min_type) |
39279cc3 CM |
779 | break; |
780 | ||
5f39d397 | 781 | item_end = found_key.offset; |
39279cc3 | 782 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 783 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 784 | struct btrfs_file_extent_item); |
179e29e4 CM |
785 | extent_type = btrfs_file_extent_type(leaf, fi); |
786 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 787 | item_end += |
db94535d | 788 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 CM |
789 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
790 | struct btrfs_item *item = btrfs_item_nr(leaf, | |
791 | path->slots[0]); | |
792 | item_end += btrfs_file_extent_inline_len(leaf, | |
793 | item); | |
39279cc3 | 794 | } |
008630c1 | 795 | item_end--; |
39279cc3 CM |
796 | } |
797 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
798 | ret = btrfs_csum_truncate(trans, root, path, | |
799 | inode->i_size); | |
800 | BUG_ON(ret); | |
801 | } | |
008630c1 | 802 | if (item_end < inode->i_size) { |
b888db2b CM |
803 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
804 | found_type = BTRFS_INODE_ITEM_KEY; | |
805 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
806 | found_type = BTRFS_CSUM_ITEM_KEY; | |
85e21bac CM |
807 | } else if (found_type == BTRFS_EXTENT_DATA_KEY) { |
808 | found_type = BTRFS_XATTR_ITEM_KEY; | |
809 | } else if (found_type == BTRFS_XATTR_ITEM_KEY) { | |
810 | found_type = BTRFS_INODE_REF_KEY; | |
b888db2b CM |
811 | } else if (found_type) { |
812 | found_type--; | |
813 | } else { | |
814 | break; | |
39279cc3 | 815 | } |
a61721d5 | 816 | btrfs_set_key_type(&key, found_type); |
85e21bac | 817 | goto next; |
39279cc3 | 818 | } |
5f39d397 | 819 | if (found_key.offset >= inode->i_size) |
39279cc3 CM |
820 | del_item = 1; |
821 | else | |
822 | del_item = 0; | |
823 | found_extent = 0; | |
824 | ||
825 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
179e29e4 CM |
826 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
827 | goto delete; | |
828 | ||
829 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 830 | u64 num_dec; |
db94535d | 831 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 832 | if (!del_item) { |
db94535d CM |
833 | u64 orig_num_bytes = |
834 | btrfs_file_extent_num_bytes(leaf, fi); | |
835 | extent_num_bytes = inode->i_size - | |
5f39d397 | 836 | found_key.offset + root->sectorsize - 1; |
b1632b10 Y |
837 | extent_num_bytes = extent_num_bytes & |
838 | ~((u64)root->sectorsize - 1); | |
db94535d CM |
839 | btrfs_set_file_extent_num_bytes(leaf, fi, |
840 | extent_num_bytes); | |
841 | num_dec = (orig_num_bytes - | |
9069218d CM |
842 | extent_num_bytes); |
843 | if (extent_start != 0) | |
844 | dec_i_blocks(inode, num_dec); | |
5f39d397 | 845 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 846 | } else { |
db94535d CM |
847 | extent_num_bytes = |
848 | btrfs_file_extent_disk_num_bytes(leaf, | |
849 | fi); | |
39279cc3 | 850 | /* FIXME blocksize != 4096 */ |
9069218d | 851 | num_dec = btrfs_file_extent_num_bytes(leaf, fi); |
39279cc3 CM |
852 | if (extent_start != 0) { |
853 | found_extent = 1; | |
9069218d | 854 | dec_i_blocks(inode, num_dec); |
39279cc3 | 855 | } |
d8d5f3e1 CM |
856 | root_gen = btrfs_header_generation(leaf); |
857 | root_owner = btrfs_header_owner(leaf); | |
39279cc3 | 858 | } |
9069218d CM |
859 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
860 | if (!del_item) { | |
861 | u32 newsize = inode->i_size - found_key.offset; | |
862 | dec_i_blocks(inode, item_end + 1 - | |
863 | found_key.offset - newsize); | |
864 | newsize = | |
865 | btrfs_file_extent_calc_inline_size(newsize); | |
866 | ret = btrfs_truncate_item(trans, root, path, | |
867 | newsize, 1); | |
868 | BUG_ON(ret); | |
869 | } else { | |
870 | dec_i_blocks(inode, item_end + 1 - | |
871 | found_key.offset); | |
872 | } | |
39279cc3 | 873 | } |
179e29e4 | 874 | delete: |
39279cc3 | 875 | if (del_item) { |
85e21bac CM |
876 | if (!pending_del_nr) { |
877 | /* no pending yet, add ourselves */ | |
878 | pending_del_slot = path->slots[0]; | |
879 | pending_del_nr = 1; | |
880 | } else if (pending_del_nr && | |
881 | path->slots[0] + 1 == pending_del_slot) { | |
882 | /* hop on the pending chunk */ | |
883 | pending_del_nr++; | |
884 | pending_del_slot = path->slots[0]; | |
885 | } else { | |
886 | printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot); | |
887 | } | |
39279cc3 CM |
888 | } else { |
889 | break; | |
890 | } | |
39279cc3 CM |
891 | if (found_extent) { |
892 | ret = btrfs_free_extent(trans, root, extent_start, | |
7bb86316 | 893 | extent_num_bytes, |
d8d5f3e1 | 894 | root_owner, |
7bb86316 CM |
895 | root_gen, inode->i_ino, |
896 | found_key.offset, 0); | |
39279cc3 CM |
897 | BUG_ON(ret); |
898 | } | |
85e21bac CM |
899 | next: |
900 | if (path->slots[0] == 0) { | |
901 | if (pending_del_nr) | |
902 | goto del_pending; | |
903 | btrfs_release_path(root, path); | |
904 | goto search_again; | |
905 | } | |
906 | ||
907 | path->slots[0]--; | |
908 | if (pending_del_nr && | |
909 | path->slots[0] + 1 != pending_del_slot) { | |
910 | struct btrfs_key debug; | |
911 | del_pending: | |
912 | btrfs_item_key_to_cpu(path->nodes[0], &debug, | |
913 | pending_del_slot); | |
914 | ret = btrfs_del_items(trans, root, path, | |
915 | pending_del_slot, | |
916 | pending_del_nr); | |
917 | BUG_ON(ret); | |
918 | pending_del_nr = 0; | |
919 | btrfs_release_path(root, path); | |
920 | goto search_again; | |
921 | } | |
39279cc3 CM |
922 | } |
923 | ret = 0; | |
924 | error: | |
85e21bac CM |
925 | if (pending_del_nr) { |
926 | ret = btrfs_del_items(trans, root, path, pending_del_slot, | |
927 | pending_del_nr); | |
928 | } | |
39279cc3 CM |
929 | btrfs_release_path(root, path); |
930 | btrfs_free_path(path); | |
931 | inode->i_sb->s_dirt = 1; | |
932 | return ret; | |
933 | } | |
934 | ||
b888db2b | 935 | static int btrfs_cow_one_page(struct inode *inode, struct page *page, |
a52d9a80 CM |
936 | size_t zero_start) |
937 | { | |
938 | char *kaddr; | |
d1310b2e | 939 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
35ebb934 | 940 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
b888db2b | 941 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
1832a6d5 | 942 | int ret = 0; |
a52d9a80 | 943 | |
190662b2 | 944 | WARN_ON(!PageLocked(page)); |
b3cfa35a | 945 | set_page_extent_mapped(page); |
a52d9a80 | 946 | |
d1310b2e | 947 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
d1310b2e | 948 | set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start, |
b888db2b | 949 | page_end, GFP_NOFS); |
1832a6d5 | 950 | |
a52d9a80 | 951 | if (zero_start != PAGE_CACHE_SIZE) { |
b888db2b | 952 | kaddr = kmap(page); |
a52d9a80 CM |
953 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
954 | flush_dcache_page(page); | |
b888db2b | 955 | kunmap(page); |
a52d9a80 | 956 | } |
b888db2b | 957 | set_page_dirty(page); |
d1310b2e | 958 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
a52d9a80 | 959 | |
a52d9a80 CM |
960 | return ret; |
961 | } | |
962 | ||
39279cc3 CM |
963 | /* |
964 | * taken from block_truncate_page, but does cow as it zeros out | |
965 | * any bytes left in the last page in the file. | |
966 | */ | |
967 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
968 | { | |
969 | struct inode *inode = mapping->host; | |
db94535d CM |
970 | struct btrfs_root *root = BTRFS_I(inode)->root; |
971 | u32 blocksize = root->sectorsize; | |
39279cc3 CM |
972 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
973 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
974 | struct page *page; | |
39279cc3 | 975 | int ret = 0; |
a52d9a80 | 976 | u64 page_start; |
39279cc3 CM |
977 | |
978 | if ((offset & (blocksize - 1)) == 0) | |
979 | goto out; | |
980 | ||
981 | ret = -ENOMEM; | |
982 | page = grab_cache_page(mapping, index); | |
983 | if (!page) | |
984 | goto out; | |
39279cc3 | 985 | if (!PageUptodate(page)) { |
9ebefb18 | 986 | ret = btrfs_readpage(NULL, page); |
39279cc3 CM |
987 | lock_page(page); |
988 | if (!PageUptodate(page)) { | |
989 | ret = -EIO; | |
990 | goto out; | |
991 | } | |
992 | } | |
35ebb934 | 993 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 994 | |
b888db2b | 995 | ret = btrfs_cow_one_page(inode, page, offset); |
39279cc3 | 996 | |
39279cc3 CM |
997 | unlock_page(page); |
998 | page_cache_release(page); | |
999 | out: | |
1000 | return ret; | |
1001 | } | |
1002 | ||
1003 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
1004 | { | |
1005 | struct inode *inode = dentry->d_inode; | |
1006 | int err; | |
1007 | ||
1008 | err = inode_change_ok(inode, attr); | |
1009 | if (err) | |
1010 | return err; | |
1011 | ||
1012 | if (S_ISREG(inode->i_mode) && | |
1013 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
1014 | struct btrfs_trans_handle *trans; | |
1015 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 1016 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2bf5a725 | 1017 | |
5f39d397 | 1018 | u64 mask = root->sectorsize - 1; |
1b0f7c29 | 1019 | u64 hole_start = (inode->i_size + mask) & ~mask; |
f392a938 | 1020 | u64 block_end = (attr->ia_size + mask) & ~mask; |
39279cc3 | 1021 | u64 hole_size; |
179e29e4 | 1022 | u64 alloc_hint = 0; |
39279cc3 | 1023 | |
1b0f7c29 | 1024 | if (attr->ia_size <= hole_start) |
39279cc3 CM |
1025 | goto out; |
1026 | ||
1832a6d5 CM |
1027 | mutex_lock(&root->fs_info->fs_mutex); |
1028 | err = btrfs_check_free_space(root, 1, 0); | |
1029 | mutex_unlock(&root->fs_info->fs_mutex); | |
1030 | if (err) | |
1031 | goto fail; | |
1032 | ||
39279cc3 CM |
1033 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
1034 | ||
1b0f7c29 | 1035 | lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); |
5f56406a | 1036 | hole_size = block_end - hole_start; |
39279cc3 CM |
1037 | |
1038 | mutex_lock(&root->fs_info->fs_mutex); | |
1039 | trans = btrfs_start_transaction(root, 1); | |
1040 | btrfs_set_trans_block_group(trans, inode); | |
2bf5a725 | 1041 | err = btrfs_drop_extents(trans, root, inode, |
1b0f7c29 | 1042 | hole_start, block_end, hole_start, |
3326d1b0 | 1043 | &alloc_hint); |
2bf5a725 | 1044 | |
179e29e4 CM |
1045 | if (alloc_hint != EXTENT_MAP_INLINE) { |
1046 | err = btrfs_insert_file_extent(trans, root, | |
1047 | inode->i_ino, | |
5f56406a CM |
1048 | hole_start, 0, 0, |
1049 | hole_size); | |
d1310b2e CM |
1050 | btrfs_drop_extent_cache(inode, hole_start, |
1051 | hole_size - 1); | |
5f56406a | 1052 | btrfs_check_file(root, inode); |
179e29e4 | 1053 | } |
39279cc3 CM |
1054 | btrfs_end_transaction(trans, root); |
1055 | mutex_unlock(&root->fs_info->fs_mutex); | |
1b0f7c29 | 1056 | unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); |
54aa1f4d CM |
1057 | if (err) |
1058 | return err; | |
39279cc3 CM |
1059 | } |
1060 | out: | |
1061 | err = inode_setattr(inode, attr); | |
1832a6d5 | 1062 | fail: |
39279cc3 CM |
1063 | return err; |
1064 | } | |
61295eb8 | 1065 | |
2da98f00 | 1066 | void btrfs_put_inode(struct inode *inode) |
61295eb8 | 1067 | { |
2da98f00 CM |
1068 | int ret; |
1069 | ||
1070 | if (!BTRFS_I(inode)->ordered_trans) { | |
61295eb8 CM |
1071 | return; |
1072 | } | |
2da98f00 CM |
1073 | |
1074 | if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) || | |
1075 | mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK)) | |
1076 | return; | |
1077 | ||
1078 | ret = btrfs_del_ordered_inode(inode); | |
1079 | if (ret == 1) { | |
1080 | atomic_dec(&inode->i_count); | |
1081 | } | |
61295eb8 CM |
1082 | } |
1083 | ||
39279cc3 CM |
1084 | void btrfs_delete_inode(struct inode *inode) |
1085 | { | |
1086 | struct btrfs_trans_handle *trans; | |
1087 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 1088 | unsigned long nr; |
39279cc3 CM |
1089 | int ret; |
1090 | ||
1091 | truncate_inode_pages(&inode->i_data, 0); | |
1092 | if (is_bad_inode(inode)) { | |
1093 | goto no_delete; | |
1094 | } | |
5f39d397 | 1095 | |
39279cc3 CM |
1096 | inode->i_size = 0; |
1097 | mutex_lock(&root->fs_info->fs_mutex); | |
1098 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 1099 | |
39279cc3 | 1100 | btrfs_set_trans_block_group(trans, inode); |
85e21bac | 1101 | ret = btrfs_truncate_in_trans(trans, root, inode, 0); |
54aa1f4d CM |
1102 | if (ret) |
1103 | goto no_delete_lock; | |
85e21bac | 1104 | |
d3c2fdcf | 1105 | nr = trans->blocks_used; |
85e21bac | 1106 | clear_inode(inode); |
5f39d397 | 1107 | |
39279cc3 CM |
1108 | btrfs_end_transaction(trans, root); |
1109 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1110 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1111 | btrfs_throttle(root); |
39279cc3 | 1112 | return; |
54aa1f4d CM |
1113 | |
1114 | no_delete_lock: | |
d3c2fdcf | 1115 | nr = trans->blocks_used; |
54aa1f4d CM |
1116 | btrfs_end_transaction(trans, root); |
1117 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1118 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1119 | btrfs_throttle(root); |
39279cc3 CM |
1120 | no_delete: |
1121 | clear_inode(inode); | |
1122 | } | |
1123 | ||
1124 | /* | |
1125 | * this returns the key found in the dir entry in the location pointer. | |
1126 | * If no dir entries were found, location->objectid is 0. | |
1127 | */ | |
1128 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
1129 | struct btrfs_key *location) | |
1130 | { | |
1131 | const char *name = dentry->d_name.name; | |
1132 | int namelen = dentry->d_name.len; | |
1133 | struct btrfs_dir_item *di; | |
1134 | struct btrfs_path *path; | |
1135 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 1136 | int ret = 0; |
39279cc3 | 1137 | |
3954401f CM |
1138 | if (namelen == 1 && strcmp(name, ".") == 0) { |
1139 | location->objectid = dir->i_ino; | |
1140 | location->type = BTRFS_INODE_ITEM_KEY; | |
1141 | location->offset = 0; | |
1142 | return 0; | |
1143 | } | |
39279cc3 CM |
1144 | path = btrfs_alloc_path(); |
1145 | BUG_ON(!path); | |
3954401f | 1146 | |
7a720536 | 1147 | if (namelen == 2 && strcmp(name, "..") == 0) { |
3954401f CM |
1148 | struct btrfs_key key; |
1149 | struct extent_buffer *leaf; | |
1150 | u32 nritems; | |
1151 | int slot; | |
1152 | ||
1153 | key.objectid = dir->i_ino; | |
1154 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1155 | key.offset = 0; | |
1156 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1157 | BUG_ON(ret == 0); | |
1158 | ret = 0; | |
1159 | ||
1160 | leaf = path->nodes[0]; | |
1161 | slot = path->slots[0]; | |
1162 | nritems = btrfs_header_nritems(leaf); | |
1163 | if (slot >= nritems) | |
1164 | goto out_err; | |
1165 | ||
1166 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
1167 | if (key.objectid != dir->i_ino || | |
1168 | key.type != BTRFS_INODE_REF_KEY) { | |
1169 | goto out_err; | |
1170 | } | |
1171 | location->objectid = key.offset; | |
1172 | location->type = BTRFS_INODE_ITEM_KEY; | |
1173 | location->offset = 0; | |
1174 | goto out; | |
1175 | } | |
1176 | ||
39279cc3 CM |
1177 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
1178 | namelen, 0); | |
0d9f7f3e Y |
1179 | if (IS_ERR(di)) |
1180 | ret = PTR_ERR(di); | |
39279cc3 | 1181 | if (!di || IS_ERR(di)) { |
3954401f | 1182 | goto out_err; |
39279cc3 | 1183 | } |
5f39d397 | 1184 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 1185 | out: |
39279cc3 CM |
1186 | btrfs_free_path(path); |
1187 | return ret; | |
3954401f CM |
1188 | out_err: |
1189 | location->objectid = 0; | |
1190 | goto out; | |
39279cc3 CM |
1191 | } |
1192 | ||
1193 | /* | |
1194 | * when we hit a tree root in a directory, the btrfs part of the inode | |
1195 | * needs to be changed to reflect the root directory of the tree root. This | |
1196 | * is kind of like crossing a mount point. | |
1197 | */ | |
1198 | static int fixup_tree_root_location(struct btrfs_root *root, | |
1199 | struct btrfs_key *location, | |
58176a96 JB |
1200 | struct btrfs_root **sub_root, |
1201 | struct dentry *dentry) | |
39279cc3 CM |
1202 | { |
1203 | struct btrfs_path *path; | |
1204 | struct btrfs_root_item *ri; | |
1205 | ||
1206 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
1207 | return 0; | |
1208 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1209 | return 0; | |
1210 | ||
1211 | path = btrfs_alloc_path(); | |
1212 | BUG_ON(!path); | |
1213 | mutex_lock(&root->fs_info->fs_mutex); | |
1214 | ||
58176a96 JB |
1215 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
1216 | dentry->d_name.name, | |
1217 | dentry->d_name.len); | |
39279cc3 CM |
1218 | if (IS_ERR(*sub_root)) |
1219 | return PTR_ERR(*sub_root); | |
1220 | ||
1221 | ri = &(*sub_root)->root_item; | |
1222 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
1223 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
1224 | location->offset = 0; | |
1225 | ||
1226 | btrfs_free_path(path); | |
1227 | mutex_unlock(&root->fs_info->fs_mutex); | |
1228 | return 0; | |
1229 | } | |
1230 | ||
1231 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
1232 | { | |
1233 | struct btrfs_iget_args *args = p; | |
1234 | inode->i_ino = args->ino; | |
1235 | BTRFS_I(inode)->root = args->root; | |
9069218d | 1236 | BTRFS_I(inode)->delalloc_bytes = 0; |
d1310b2e CM |
1237 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1238 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 1239 | inode->i_mapping, GFP_NOFS); |
39279cc3 CM |
1240 | return 0; |
1241 | } | |
1242 | ||
1243 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
1244 | { | |
1245 | struct btrfs_iget_args *args = opaque; | |
1246 | return (args->ino == inode->i_ino && | |
1247 | args->root == BTRFS_I(inode)->root); | |
1248 | } | |
1249 | ||
dc17ff8f CM |
1250 | struct inode *btrfs_ilookup(struct super_block *s, u64 objectid, |
1251 | u64 root_objectid) | |
1252 | { | |
1253 | struct btrfs_iget_args args; | |
1254 | args.ino = objectid; | |
1255 | args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid); | |
1256 | ||
1257 | if (!args.root) | |
1258 | return NULL; | |
1259 | ||
1260 | return ilookup5(s, objectid, btrfs_find_actor, (void *)&args); | |
1261 | } | |
1262 | ||
39279cc3 CM |
1263 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, |
1264 | struct btrfs_root *root) | |
1265 | { | |
1266 | struct inode *inode; | |
1267 | struct btrfs_iget_args args; | |
1268 | args.ino = objectid; | |
1269 | args.root = root; | |
1270 | ||
1271 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
1272 | btrfs_init_locked_inode, | |
1273 | (void *)&args); | |
1274 | return inode; | |
1275 | } | |
1276 | ||
1277 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
1278 | struct nameidata *nd) | |
1279 | { | |
1280 | struct inode * inode; | |
1281 | struct btrfs_inode *bi = BTRFS_I(dir); | |
1282 | struct btrfs_root *root = bi->root; | |
1283 | struct btrfs_root *sub_root = root; | |
1284 | struct btrfs_key location; | |
1285 | int ret; | |
1286 | ||
1287 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
1288 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 1289 | |
39279cc3 CM |
1290 | mutex_lock(&root->fs_info->fs_mutex); |
1291 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
1292 | mutex_unlock(&root->fs_info->fs_mutex); | |
5f39d397 | 1293 | |
39279cc3 CM |
1294 | if (ret < 0) |
1295 | return ERR_PTR(ret); | |
5f39d397 | 1296 | |
39279cc3 CM |
1297 | inode = NULL; |
1298 | if (location.objectid) { | |
58176a96 JB |
1299 | ret = fixup_tree_root_location(root, &location, &sub_root, |
1300 | dentry); | |
39279cc3 CM |
1301 | if (ret < 0) |
1302 | return ERR_PTR(ret); | |
1303 | if (ret > 0) | |
1304 | return ERR_PTR(-ENOENT); | |
1305 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
1306 | sub_root); | |
1307 | if (!inode) | |
1308 | return ERR_PTR(-EACCES); | |
1309 | if (inode->i_state & I_NEW) { | |
1310 | /* the inode and parent dir are two different roots */ | |
1311 | if (sub_root != root) { | |
1312 | igrab(inode); | |
1313 | sub_root->inode = inode; | |
1314 | } | |
1315 | BTRFS_I(inode)->root = sub_root; | |
1316 | memcpy(&BTRFS_I(inode)->location, &location, | |
1317 | sizeof(location)); | |
1318 | btrfs_read_locked_inode(inode); | |
1319 | unlock_new_inode(inode); | |
1320 | } | |
1321 | } | |
1322 | return d_splice_alias(inode, dentry); | |
1323 | } | |
1324 | ||
39279cc3 CM |
1325 | static unsigned char btrfs_filetype_table[] = { |
1326 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
1327 | }; | |
1328 | ||
1329 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
1330 | { | |
6da6abae | 1331 | struct inode *inode = filp->f_dentry->d_inode; |
39279cc3 CM |
1332 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1333 | struct btrfs_item *item; | |
1334 | struct btrfs_dir_item *di; | |
1335 | struct btrfs_key key; | |
5f39d397 | 1336 | struct btrfs_key found_key; |
39279cc3 CM |
1337 | struct btrfs_path *path; |
1338 | int ret; | |
1339 | u32 nritems; | |
5f39d397 | 1340 | struct extent_buffer *leaf; |
39279cc3 CM |
1341 | int slot; |
1342 | int advance; | |
1343 | unsigned char d_type; | |
1344 | int over = 0; | |
1345 | u32 di_cur; | |
1346 | u32 di_total; | |
1347 | u32 di_len; | |
1348 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1349 | char tmp_name[32]; |
1350 | char *name_ptr; | |
1351 | int name_len; | |
39279cc3 CM |
1352 | |
1353 | /* FIXME, use a real flag for deciding about the key type */ | |
1354 | if (root->fs_info->tree_root == root) | |
1355 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1356 | |
3954401f CM |
1357 | /* special case for "." */ |
1358 | if (filp->f_pos == 0) { | |
1359 | over = filldir(dirent, ".", 1, | |
1360 | 1, inode->i_ino, | |
1361 | DT_DIR); | |
1362 | if (over) | |
1363 | return 0; | |
1364 | filp->f_pos = 1; | |
1365 | } | |
1366 | ||
39279cc3 CM |
1367 | mutex_lock(&root->fs_info->fs_mutex); |
1368 | key.objectid = inode->i_ino; | |
3954401f CM |
1369 | path = btrfs_alloc_path(); |
1370 | path->reada = 2; | |
1371 | ||
1372 | /* special case for .., just use the back ref */ | |
1373 | if (filp->f_pos == 1) { | |
1374 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1375 | key.offset = 0; | |
1376 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1377 | BUG_ON(ret == 0); | |
1378 | leaf = path->nodes[0]; | |
1379 | slot = path->slots[0]; | |
1380 | nritems = btrfs_header_nritems(leaf); | |
1381 | if (slot >= nritems) { | |
1382 | btrfs_release_path(root, path); | |
1383 | goto read_dir_items; | |
1384 | } | |
1385 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1386 | btrfs_release_path(root, path); | |
1387 | if (found_key.objectid != key.objectid || | |
1388 | found_key.type != BTRFS_INODE_REF_KEY) | |
1389 | goto read_dir_items; | |
1390 | over = filldir(dirent, "..", 2, | |
1391 | 2, found_key.offset, DT_DIR); | |
1392 | if (over) | |
1393 | goto nopos; | |
1394 | filp->f_pos = 2; | |
1395 | } | |
1396 | ||
1397 | read_dir_items: | |
39279cc3 CM |
1398 | btrfs_set_key_type(&key, key_type); |
1399 | key.offset = filp->f_pos; | |
5f39d397 | 1400 | |
39279cc3 CM |
1401 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1402 | if (ret < 0) | |
1403 | goto err; | |
1404 | advance = 0; | |
39279cc3 | 1405 | while(1) { |
5f39d397 CM |
1406 | leaf = path->nodes[0]; |
1407 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1408 | slot = path->slots[0]; |
1409 | if (advance || slot >= nritems) { | |
1410 | if (slot >= nritems -1) { | |
39279cc3 CM |
1411 | ret = btrfs_next_leaf(root, path); |
1412 | if (ret) | |
1413 | break; | |
5f39d397 CM |
1414 | leaf = path->nodes[0]; |
1415 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1416 | slot = path->slots[0]; |
1417 | } else { | |
1418 | slot++; | |
1419 | path->slots[0]++; | |
1420 | } | |
1421 | } | |
1422 | advance = 1; | |
5f39d397 CM |
1423 | item = btrfs_item_nr(leaf, slot); |
1424 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1425 | ||
1426 | if (found_key.objectid != key.objectid) | |
39279cc3 | 1427 | break; |
5f39d397 | 1428 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 1429 | break; |
5f39d397 | 1430 | if (found_key.offset < filp->f_pos) |
39279cc3 | 1431 | continue; |
5f39d397 CM |
1432 | |
1433 | filp->f_pos = found_key.offset; | |
39279cc3 CM |
1434 | advance = 1; |
1435 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
1436 | di_cur = 0; | |
5f39d397 | 1437 | di_total = btrfs_item_size(leaf, item); |
39279cc3 | 1438 | while(di_cur < di_total) { |
5f39d397 CM |
1439 | struct btrfs_key location; |
1440 | ||
1441 | name_len = btrfs_dir_name_len(leaf, di); | |
1442 | if (name_len < 32) { | |
1443 | name_ptr = tmp_name; | |
1444 | } else { | |
1445 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
1446 | BUG_ON(!name_ptr); | |
1447 | } | |
1448 | read_extent_buffer(leaf, name_ptr, | |
1449 | (unsigned long)(di + 1), name_len); | |
1450 | ||
1451 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
1452 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
5f39d397 CM |
1453 | over = filldir(dirent, name_ptr, name_len, |
1454 | found_key.offset, | |
1455 | location.objectid, | |
39279cc3 | 1456 | d_type); |
5f39d397 CM |
1457 | |
1458 | if (name_ptr != tmp_name) | |
1459 | kfree(name_ptr); | |
1460 | ||
39279cc3 CM |
1461 | if (over) |
1462 | goto nopos; | |
5103e947 JB |
1463 | di_len = btrfs_dir_name_len(leaf, di) + |
1464 | btrfs_dir_data_len(leaf, di) +sizeof(*di); | |
39279cc3 CM |
1465 | di_cur += di_len; |
1466 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
1467 | } | |
1468 | } | |
5e591a07 YZ |
1469 | if (key_type == BTRFS_DIR_INDEX_KEY) |
1470 | filp->f_pos = INT_LIMIT(typeof(filp->f_pos)); | |
1471 | else | |
1472 | filp->f_pos++; | |
39279cc3 CM |
1473 | nopos: |
1474 | ret = 0; | |
1475 | err: | |
1476 | btrfs_release_path(root, path); | |
1477 | btrfs_free_path(path); | |
1478 | mutex_unlock(&root->fs_info->fs_mutex); | |
1479 | return ret; | |
1480 | } | |
1481 | ||
1482 | int btrfs_write_inode(struct inode *inode, int wait) | |
1483 | { | |
1484 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1485 | struct btrfs_trans_handle *trans; | |
1486 | int ret = 0; | |
1487 | ||
1488 | if (wait) { | |
1489 | mutex_lock(&root->fs_info->fs_mutex); | |
1490 | trans = btrfs_start_transaction(root, 1); | |
1491 | btrfs_set_trans_block_group(trans, inode); | |
1492 | ret = btrfs_commit_transaction(trans, root); | |
1493 | mutex_unlock(&root->fs_info->fs_mutex); | |
1494 | } | |
1495 | return ret; | |
1496 | } | |
1497 | ||
1498 | /* | |
54aa1f4d | 1499 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
1500 | * inode changes. But, it is most likely to find the inode in cache. |
1501 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
1502 | * to keep or drop this code. | |
1503 | */ | |
1504 | void btrfs_dirty_inode(struct inode *inode) | |
1505 | { | |
1506 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1507 | struct btrfs_trans_handle *trans; | |
1508 | ||
1509 | mutex_lock(&root->fs_info->fs_mutex); | |
1510 | trans = btrfs_start_transaction(root, 1); | |
1511 | btrfs_set_trans_block_group(trans, inode); | |
1512 | btrfs_update_inode(trans, root, inode); | |
1513 | btrfs_end_transaction(trans, root); | |
1514 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
1515 | } |
1516 | ||
1517 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
1518 | struct btrfs_root *root, | |
9c58309d CM |
1519 | const char *name, int name_len, |
1520 | u64 ref_objectid, | |
39279cc3 CM |
1521 | u64 objectid, |
1522 | struct btrfs_block_group_cache *group, | |
1523 | int mode) | |
1524 | { | |
1525 | struct inode *inode; | |
5f39d397 | 1526 | struct btrfs_inode_item *inode_item; |
39279cc3 | 1527 | struct btrfs_key *location; |
5f39d397 | 1528 | struct btrfs_path *path; |
9c58309d CM |
1529 | struct btrfs_inode_ref *ref; |
1530 | struct btrfs_key key[2]; | |
1531 | u32 sizes[2]; | |
1532 | unsigned long ptr; | |
39279cc3 CM |
1533 | int ret; |
1534 | int owner; | |
1535 | ||
5f39d397 CM |
1536 | path = btrfs_alloc_path(); |
1537 | BUG_ON(!path); | |
1538 | ||
39279cc3 CM |
1539 | inode = new_inode(root->fs_info->sb); |
1540 | if (!inode) | |
1541 | return ERR_PTR(-ENOMEM); | |
1542 | ||
d1310b2e CM |
1543 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1544 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 1545 | inode->i_mapping, GFP_NOFS); |
9069218d | 1546 | BTRFS_I(inode)->delalloc_bytes = 0; |
39279cc3 | 1547 | BTRFS_I(inode)->root = root; |
b888db2b | 1548 | |
39279cc3 CM |
1549 | if (mode & S_IFDIR) |
1550 | owner = 0; | |
1551 | else | |
1552 | owner = 1; | |
1553 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
1554 | BTRFS_I(inode)->block_group = group; | |
b98b6767 | 1555 | BTRFS_I(inode)->flags = 0; |
9c58309d CM |
1556 | |
1557 | key[0].objectid = objectid; | |
1558 | btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY); | |
1559 | key[0].offset = 0; | |
1560 | ||
1561 | key[1].objectid = objectid; | |
1562 | btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY); | |
1563 | key[1].offset = ref_objectid; | |
1564 | ||
1565 | sizes[0] = sizeof(struct btrfs_inode_item); | |
1566 | sizes[1] = name_len + sizeof(*ref); | |
1567 | ||
1568 | ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2); | |
1569 | if (ret != 0) | |
5f39d397 CM |
1570 | goto fail; |
1571 | ||
9c58309d CM |
1572 | if (objectid > root->highest_inode) |
1573 | root->highest_inode = objectid; | |
1574 | ||
39279cc3 CM |
1575 | inode->i_uid = current->fsuid; |
1576 | inode->i_gid = current->fsgid; | |
1577 | inode->i_mode = mode; | |
1578 | inode->i_ino = objectid; | |
1579 | inode->i_blocks = 0; | |
1580 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
1581 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
1582 | struct btrfs_inode_item); | |
1583 | fill_inode_item(path->nodes[0], inode_item, inode); | |
9c58309d CM |
1584 | |
1585 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
1586 | struct btrfs_inode_ref); | |
1587 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); | |
1588 | ptr = (unsigned long)(ref + 1); | |
1589 | write_extent_buffer(path->nodes[0], name, ptr, name_len); | |
1590 | ||
5f39d397 CM |
1591 | btrfs_mark_buffer_dirty(path->nodes[0]); |
1592 | btrfs_free_path(path); | |
1593 | ||
39279cc3 CM |
1594 | location = &BTRFS_I(inode)->location; |
1595 | location->objectid = objectid; | |
39279cc3 CM |
1596 | location->offset = 0; |
1597 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1598 | ||
39279cc3 CM |
1599 | insert_inode_hash(inode); |
1600 | return inode; | |
5f39d397 CM |
1601 | fail: |
1602 | btrfs_free_path(path); | |
1603 | return ERR_PTR(ret); | |
39279cc3 CM |
1604 | } |
1605 | ||
1606 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1607 | { | |
1608 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1609 | } | |
1610 | ||
1611 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
9c58309d CM |
1612 | struct dentry *dentry, struct inode *inode, |
1613 | int add_backref) | |
39279cc3 CM |
1614 | { |
1615 | int ret; | |
1616 | struct btrfs_key key; | |
1617 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1618 | struct inode *parent_inode; |
5f39d397 | 1619 | |
39279cc3 | 1620 | key.objectid = inode->i_ino; |
39279cc3 CM |
1621 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
1622 | key.offset = 0; | |
1623 | ||
1624 | ret = btrfs_insert_dir_item(trans, root, | |
1625 | dentry->d_name.name, dentry->d_name.len, | |
1626 | dentry->d_parent->d_inode->i_ino, | |
1627 | &key, btrfs_inode_type(inode)); | |
1628 | if (ret == 0) { | |
9c58309d CM |
1629 | if (add_backref) { |
1630 | ret = btrfs_insert_inode_ref(trans, root, | |
1631 | dentry->d_name.name, | |
1632 | dentry->d_name.len, | |
1633 | inode->i_ino, | |
1634 | dentry->d_parent->d_inode->i_ino); | |
1635 | } | |
79c44584 CM |
1636 | parent_inode = dentry->d_parent->d_inode; |
1637 | parent_inode->i_size += dentry->d_name.len * 2; | |
1638 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; | |
39279cc3 CM |
1639 | ret = btrfs_update_inode(trans, root, |
1640 | dentry->d_parent->d_inode); | |
1641 | } | |
1642 | return ret; | |
1643 | } | |
1644 | ||
1645 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
9c58309d CM |
1646 | struct dentry *dentry, struct inode *inode, |
1647 | int backref) | |
39279cc3 | 1648 | { |
9c58309d | 1649 | int err = btrfs_add_link(trans, dentry, inode, backref); |
39279cc3 CM |
1650 | if (!err) { |
1651 | d_instantiate(dentry, inode); | |
1652 | return 0; | |
1653 | } | |
1654 | if (err > 0) | |
1655 | err = -EEXIST; | |
1656 | return err; | |
1657 | } | |
1658 | ||
618e21d5 JB |
1659 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1660 | int mode, dev_t rdev) | |
1661 | { | |
1662 | struct btrfs_trans_handle *trans; | |
1663 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1664 | struct inode *inode = NULL; |
618e21d5 JB |
1665 | int err; |
1666 | int drop_inode = 0; | |
1667 | u64 objectid; | |
1832a6d5 | 1668 | unsigned long nr = 0; |
618e21d5 JB |
1669 | |
1670 | if (!new_valid_dev(rdev)) | |
1671 | return -EINVAL; | |
1672 | ||
1673 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1674 | err = btrfs_check_free_space(root, 1, 0); |
1675 | if (err) | |
1676 | goto fail; | |
1677 | ||
618e21d5 JB |
1678 | trans = btrfs_start_transaction(root, 1); |
1679 | btrfs_set_trans_block_group(trans, dir); | |
1680 | ||
1681 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1682 | if (err) { | |
1683 | err = -ENOSPC; | |
1684 | goto out_unlock; | |
1685 | } | |
1686 | ||
9c58309d CM |
1687 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
1688 | dentry->d_name.len, | |
1689 | dentry->d_parent->d_inode->i_ino, objectid, | |
618e21d5 JB |
1690 | BTRFS_I(dir)->block_group, mode); |
1691 | err = PTR_ERR(inode); | |
1692 | if (IS_ERR(inode)) | |
1693 | goto out_unlock; | |
1694 | ||
1695 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 1696 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
618e21d5 JB |
1697 | if (err) |
1698 | drop_inode = 1; | |
1699 | else { | |
1700 | inode->i_op = &btrfs_special_inode_operations; | |
1701 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 1702 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
1703 | } |
1704 | dir->i_sb->s_dirt = 1; | |
1705 | btrfs_update_inode_block_group(trans, inode); | |
1706 | btrfs_update_inode_block_group(trans, dir); | |
1707 | out_unlock: | |
d3c2fdcf | 1708 | nr = trans->blocks_used; |
618e21d5 | 1709 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1710 | fail: |
618e21d5 JB |
1711 | mutex_unlock(&root->fs_info->fs_mutex); |
1712 | ||
1713 | if (drop_inode) { | |
1714 | inode_dec_link_count(inode); | |
1715 | iput(inode); | |
1716 | } | |
d3c2fdcf | 1717 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1718 | btrfs_throttle(root); |
618e21d5 JB |
1719 | return err; |
1720 | } | |
1721 | ||
39279cc3 CM |
1722 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
1723 | int mode, struct nameidata *nd) | |
1724 | { | |
1725 | struct btrfs_trans_handle *trans; | |
1726 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1727 | struct inode *inode = NULL; |
39279cc3 CM |
1728 | int err; |
1729 | int drop_inode = 0; | |
1832a6d5 | 1730 | unsigned long nr = 0; |
39279cc3 CM |
1731 | u64 objectid; |
1732 | ||
1733 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1734 | err = btrfs_check_free_space(root, 1, 0); |
1735 | if (err) | |
1736 | goto fail; | |
39279cc3 CM |
1737 | trans = btrfs_start_transaction(root, 1); |
1738 | btrfs_set_trans_block_group(trans, dir); | |
1739 | ||
1740 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1741 | if (err) { | |
1742 | err = -ENOSPC; | |
1743 | goto out_unlock; | |
1744 | } | |
1745 | ||
9c58309d CM |
1746 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
1747 | dentry->d_name.len, | |
1748 | dentry->d_parent->d_inode->i_ino, | |
1749 | objectid, BTRFS_I(dir)->block_group, mode); | |
39279cc3 CM |
1750 | err = PTR_ERR(inode); |
1751 | if (IS_ERR(inode)) | |
1752 | goto out_unlock; | |
1753 | ||
1754 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 1755 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
39279cc3 CM |
1756 | if (err) |
1757 | drop_inode = 1; | |
1758 | else { | |
1759 | inode->i_mapping->a_ops = &btrfs_aops; | |
1760 | inode->i_fop = &btrfs_file_operations; | |
1761 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
1762 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1763 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 1764 | inode->i_mapping, GFP_NOFS); |
9069218d | 1765 | BTRFS_I(inode)->delalloc_bytes = 0; |
d1310b2e | 1766 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
1767 | } |
1768 | dir->i_sb->s_dirt = 1; | |
1769 | btrfs_update_inode_block_group(trans, inode); | |
1770 | btrfs_update_inode_block_group(trans, dir); | |
1771 | out_unlock: | |
d3c2fdcf | 1772 | nr = trans->blocks_used; |
39279cc3 | 1773 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1774 | fail: |
39279cc3 CM |
1775 | mutex_unlock(&root->fs_info->fs_mutex); |
1776 | ||
1777 | if (drop_inode) { | |
1778 | inode_dec_link_count(inode); | |
1779 | iput(inode); | |
1780 | } | |
d3c2fdcf | 1781 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1782 | btrfs_throttle(root); |
39279cc3 CM |
1783 | return err; |
1784 | } | |
1785 | ||
1786 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
1787 | struct dentry *dentry) | |
1788 | { | |
1789 | struct btrfs_trans_handle *trans; | |
1790 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1791 | struct inode *inode = old_dentry->d_inode; | |
1832a6d5 | 1792 | unsigned long nr = 0; |
39279cc3 CM |
1793 | int err; |
1794 | int drop_inode = 0; | |
1795 | ||
1796 | if (inode->i_nlink == 0) | |
1797 | return -ENOENT; | |
1798 | ||
6da6abae CM |
1799 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
1800 | inode->i_nlink++; | |
1801 | #else | |
39279cc3 | 1802 | inc_nlink(inode); |
6da6abae | 1803 | #endif |
39279cc3 | 1804 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
1805 | err = btrfs_check_free_space(root, 1, 0); |
1806 | if (err) | |
1807 | goto fail; | |
39279cc3 | 1808 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 1809 | |
39279cc3 CM |
1810 | btrfs_set_trans_block_group(trans, dir); |
1811 | atomic_inc(&inode->i_count); | |
9c58309d | 1812 | err = btrfs_add_nondir(trans, dentry, inode, 1); |
5f39d397 | 1813 | |
39279cc3 CM |
1814 | if (err) |
1815 | drop_inode = 1; | |
5f39d397 | 1816 | |
39279cc3 CM |
1817 | dir->i_sb->s_dirt = 1; |
1818 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 1819 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 1820 | |
54aa1f4d CM |
1821 | if (err) |
1822 | drop_inode = 1; | |
39279cc3 | 1823 | |
d3c2fdcf | 1824 | nr = trans->blocks_used; |
39279cc3 | 1825 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1826 | fail: |
39279cc3 CM |
1827 | mutex_unlock(&root->fs_info->fs_mutex); |
1828 | ||
1829 | if (drop_inode) { | |
1830 | inode_dec_link_count(inode); | |
1831 | iput(inode); | |
1832 | } | |
d3c2fdcf | 1833 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1834 | btrfs_throttle(root); |
39279cc3 CM |
1835 | return err; |
1836 | } | |
1837 | ||
39279cc3 CM |
1838 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
1839 | { | |
1840 | struct inode *inode; | |
1841 | struct btrfs_trans_handle *trans; | |
1842 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1843 | int err = 0; | |
1844 | int drop_on_err = 0; | |
1845 | u64 objectid; | |
d3c2fdcf | 1846 | unsigned long nr = 1; |
39279cc3 CM |
1847 | |
1848 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1849 | err = btrfs_check_free_space(root, 1, 0); |
1850 | if (err) | |
1851 | goto out_unlock; | |
1852 | ||
39279cc3 CM |
1853 | trans = btrfs_start_transaction(root, 1); |
1854 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 1855 | |
39279cc3 CM |
1856 | if (IS_ERR(trans)) { |
1857 | err = PTR_ERR(trans); | |
1858 | goto out_unlock; | |
1859 | } | |
1860 | ||
1861 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1862 | if (err) { | |
1863 | err = -ENOSPC; | |
1864 | goto out_unlock; | |
1865 | } | |
1866 | ||
9c58309d CM |
1867 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
1868 | dentry->d_name.len, | |
1869 | dentry->d_parent->d_inode->i_ino, objectid, | |
39279cc3 CM |
1870 | BTRFS_I(dir)->block_group, S_IFDIR | mode); |
1871 | if (IS_ERR(inode)) { | |
1872 | err = PTR_ERR(inode); | |
1873 | goto out_fail; | |
1874 | } | |
5f39d397 | 1875 | |
39279cc3 CM |
1876 | drop_on_err = 1; |
1877 | inode->i_op = &btrfs_dir_inode_operations; | |
1878 | inode->i_fop = &btrfs_dir_file_operations; | |
1879 | btrfs_set_trans_block_group(trans, inode); | |
1880 | ||
3954401f | 1881 | inode->i_size = 0; |
39279cc3 CM |
1882 | err = btrfs_update_inode(trans, root, inode); |
1883 | if (err) | |
1884 | goto out_fail; | |
5f39d397 | 1885 | |
9c58309d | 1886 | err = btrfs_add_link(trans, dentry, inode, 0); |
39279cc3 CM |
1887 | if (err) |
1888 | goto out_fail; | |
5f39d397 | 1889 | |
39279cc3 CM |
1890 | d_instantiate(dentry, inode); |
1891 | drop_on_err = 0; | |
1892 | dir->i_sb->s_dirt = 1; | |
1893 | btrfs_update_inode_block_group(trans, inode); | |
1894 | btrfs_update_inode_block_group(trans, dir); | |
1895 | ||
1896 | out_fail: | |
d3c2fdcf | 1897 | nr = trans->blocks_used; |
39279cc3 | 1898 | btrfs_end_transaction(trans, root); |
5f39d397 | 1899 | |
39279cc3 CM |
1900 | out_unlock: |
1901 | mutex_unlock(&root->fs_info->fs_mutex); | |
1902 | if (drop_on_err) | |
1903 | iput(inode); | |
d3c2fdcf | 1904 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1905 | btrfs_throttle(root); |
39279cc3 CM |
1906 | return err; |
1907 | } | |
1908 | ||
a52d9a80 | 1909 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
70dec807 | 1910 | size_t pg_offset, u64 start, u64 len, |
a52d9a80 CM |
1911 | int create) |
1912 | { | |
1913 | int ret; | |
1914 | int err = 0; | |
db94535d | 1915 | u64 bytenr; |
a52d9a80 CM |
1916 | u64 extent_start = 0; |
1917 | u64 extent_end = 0; | |
1918 | u64 objectid = inode->i_ino; | |
1919 | u32 found_type; | |
a52d9a80 CM |
1920 | struct btrfs_path *path; |
1921 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1922 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
1923 | struct extent_buffer *leaf; |
1924 | struct btrfs_key found_key; | |
a52d9a80 CM |
1925 | struct extent_map *em = NULL; |
1926 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
d1310b2e | 1927 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
a52d9a80 CM |
1928 | struct btrfs_trans_handle *trans = NULL; |
1929 | ||
1930 | path = btrfs_alloc_path(); | |
1931 | BUG_ON(!path); | |
1932 | mutex_lock(&root->fs_info->fs_mutex); | |
1933 | ||
1934 | again: | |
d1310b2e CM |
1935 | spin_lock(&em_tree->lock); |
1936 | em = lookup_extent_mapping(em_tree, start, len); | |
1937 | spin_unlock(&em_tree->lock); | |
1938 | ||
a52d9a80 | 1939 | if (em) { |
56b453c9 | 1940 | if (em->start > start) { |
d1310b2e CM |
1941 | printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n", |
1942 | start, len, em->start, em->len); | |
56b453c9 CM |
1943 | WARN_ON(1); |
1944 | } | |
70dec807 CM |
1945 | if (em->block_start == EXTENT_MAP_INLINE && page) |
1946 | free_extent_map(em); | |
1947 | else | |
1948 | goto out; | |
a52d9a80 | 1949 | } |
d1310b2e | 1950 | em = alloc_extent_map(GFP_NOFS); |
a52d9a80 | 1951 | if (!em) { |
d1310b2e CM |
1952 | err = -ENOMEM; |
1953 | goto out; | |
a52d9a80 | 1954 | } |
d1310b2e CM |
1955 | |
1956 | em->start = EXTENT_MAP_HOLE; | |
1957 | em->len = (u64)-1; | |
a52d9a80 | 1958 | em->bdev = inode->i_sb->s_bdev; |
179e29e4 CM |
1959 | ret = btrfs_lookup_file_extent(trans, root, path, |
1960 | objectid, start, trans != NULL); | |
a52d9a80 CM |
1961 | if (ret < 0) { |
1962 | err = ret; | |
1963 | goto out; | |
1964 | } | |
1965 | ||
1966 | if (ret != 0) { | |
1967 | if (path->slots[0] == 0) | |
1968 | goto not_found; | |
1969 | path->slots[0]--; | |
1970 | } | |
1971 | ||
5f39d397 CM |
1972 | leaf = path->nodes[0]; |
1973 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 1974 | struct btrfs_file_extent_item); |
a52d9a80 | 1975 | /* are we inside the extent that was found? */ |
5f39d397 CM |
1976 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
1977 | found_type = btrfs_key_type(&found_key); | |
1978 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
1979 | found_type != BTRFS_EXTENT_DATA_KEY) { |
1980 | goto not_found; | |
1981 | } | |
1982 | ||
5f39d397 CM |
1983 | found_type = btrfs_file_extent_type(leaf, item); |
1984 | extent_start = found_key.offset; | |
a52d9a80 CM |
1985 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
1986 | extent_end = extent_start + | |
db94535d | 1987 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 1988 | err = 0; |
b888db2b | 1989 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1990 | em->start = start; |
1991 | if (start < extent_start) { | |
d1310b2e | 1992 | if (start + len <= extent_start) |
b888db2b | 1993 | goto not_found; |
d1310b2e | 1994 | em->len = extent_end - extent_start; |
a52d9a80 | 1995 | } else { |
d1310b2e | 1996 | em->len = len; |
a52d9a80 CM |
1997 | } |
1998 | goto not_found_em; | |
1999 | } | |
db94535d CM |
2000 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
2001 | if (bytenr == 0) { | |
a52d9a80 | 2002 | em->start = extent_start; |
d1310b2e | 2003 | em->len = extent_end - extent_start; |
5f39d397 | 2004 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2005 | goto insert; |
2006 | } | |
db94535d CM |
2007 | bytenr += btrfs_file_extent_offset(leaf, item); |
2008 | em->block_start = bytenr; | |
a52d9a80 | 2009 | em->start = extent_start; |
d1310b2e | 2010 | em->len = extent_end - extent_start; |
a52d9a80 CM |
2011 | goto insert; |
2012 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
70dec807 | 2013 | u64 page_start; |
5f39d397 | 2014 | unsigned long ptr; |
a52d9a80 | 2015 | char *map; |
3326d1b0 CM |
2016 | size_t size; |
2017 | size_t extent_offset; | |
2018 | size_t copy_size; | |
a52d9a80 | 2019 | |
5f39d397 CM |
2020 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
2021 | path->slots[0])); | |
d1310b2e CM |
2022 | extent_end = (extent_start + size + root->sectorsize - 1) & |
2023 | ~((u64)root->sectorsize - 1); | |
b888db2b | 2024 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
2025 | em->start = start; |
2026 | if (start < extent_start) { | |
d1310b2e | 2027 | if (start + len <= extent_start) |
b888db2b | 2028 | goto not_found; |
d1310b2e | 2029 | em->len = extent_end - extent_start; |
a52d9a80 | 2030 | } else { |
d1310b2e | 2031 | em->len = len; |
a52d9a80 CM |
2032 | } |
2033 | goto not_found_em; | |
2034 | } | |
689f9346 | 2035 | em->block_start = EXTENT_MAP_INLINE; |
689f9346 Y |
2036 | |
2037 | if (!page) { | |
2038 | em->start = extent_start; | |
d1310b2e | 2039 | em->len = size; |
689f9346 Y |
2040 | goto out; |
2041 | } | |
5f39d397 | 2042 | |
70dec807 CM |
2043 | page_start = page_offset(page) + pg_offset; |
2044 | extent_offset = page_start - extent_start; | |
2045 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, | |
3326d1b0 | 2046 | size - extent_offset); |
3326d1b0 | 2047 | em->start = extent_start + extent_offset; |
70dec807 CM |
2048 | em->len = (copy_size + root->sectorsize - 1) & |
2049 | ~((u64)root->sectorsize - 1); | |
689f9346 Y |
2050 | map = kmap(page); |
2051 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | |
179e29e4 | 2052 | if (create == 0 && !PageUptodate(page)) { |
70dec807 | 2053 | read_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2054 | copy_size); |
2055 | flush_dcache_page(page); | |
2056 | } else if (create && PageUptodate(page)) { | |
2057 | if (!trans) { | |
2058 | kunmap(page); | |
2059 | free_extent_map(em); | |
2060 | em = NULL; | |
2061 | btrfs_release_path(root, path); | |
2062 | trans = btrfs_start_transaction(root, 1); | |
2063 | goto again; | |
2064 | } | |
70dec807 | 2065 | write_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2066 | copy_size); |
2067 | btrfs_mark_buffer_dirty(leaf); | |
a52d9a80 | 2068 | } |
a52d9a80 | 2069 | kunmap(page); |
d1310b2e CM |
2070 | set_extent_uptodate(io_tree, em->start, |
2071 | extent_map_end(em) - 1, GFP_NOFS); | |
a52d9a80 CM |
2072 | goto insert; |
2073 | } else { | |
2074 | printk("unkknown found_type %d\n", found_type); | |
2075 | WARN_ON(1); | |
2076 | } | |
2077 | not_found: | |
2078 | em->start = start; | |
d1310b2e | 2079 | em->len = len; |
a52d9a80 | 2080 | not_found_em: |
5f39d397 | 2081 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2082 | insert: |
2083 | btrfs_release_path(root, path); | |
d1310b2e CM |
2084 | if (em->start > start || extent_map_end(em) <= start) { |
2085 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len); | |
a52d9a80 CM |
2086 | err = -EIO; |
2087 | goto out; | |
2088 | } | |
d1310b2e CM |
2089 | |
2090 | err = 0; | |
2091 | spin_lock(&em_tree->lock); | |
a52d9a80 CM |
2092 | ret = add_extent_mapping(em_tree, em); |
2093 | if (ret == -EEXIST) { | |
2094 | free_extent_map(em); | |
d1310b2e CM |
2095 | em = lookup_extent_mapping(em_tree, start, len); |
2096 | if (!em) { | |
a52d9a80 | 2097 | err = -EIO; |
d1310b2e | 2098 | printk("failing to insert %Lu %Lu\n", start, len); |
a52d9a80 | 2099 | } |
a52d9a80 | 2100 | } |
d1310b2e | 2101 | spin_unlock(&em_tree->lock); |
a52d9a80 CM |
2102 | out: |
2103 | btrfs_free_path(path); | |
2104 | if (trans) { | |
2105 | ret = btrfs_end_transaction(trans, root); | |
2106 | if (!err) | |
2107 | err = ret; | |
2108 | } | |
2109 | mutex_unlock(&root->fs_info->fs_mutex); | |
2110 | if (err) { | |
2111 | free_extent_map(em); | |
2112 | WARN_ON(1); | |
2113 | return ERR_PTR(err); | |
2114 | } | |
2115 | return em; | |
2116 | } | |
2117 | ||
d396c6f5 | 2118 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 2119 | { |
d396c6f5 | 2120 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
2121 | } |
2122 | ||
a52d9a80 | 2123 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 2124 | { |
d1310b2e CM |
2125 | struct extent_io_tree *tree; |
2126 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
a52d9a80 | 2127 | return extent_read_full_page(tree, page, btrfs_get_extent); |
9ebefb18 | 2128 | } |
1832a6d5 | 2129 | |
a52d9a80 | 2130 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 2131 | { |
d1310b2e | 2132 | struct extent_io_tree *tree; |
b888db2b CM |
2133 | |
2134 | ||
2135 | if (current->flags & PF_MEMALLOC) { | |
2136 | redirty_page_for_writepage(wbc, page); | |
2137 | unlock_page(page); | |
2138 | return 0; | |
2139 | } | |
d1310b2e | 2140 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 | 2141 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
9ebefb18 CM |
2142 | } |
2143 | ||
b293f02e CM |
2144 | static int btrfs_writepages(struct address_space *mapping, |
2145 | struct writeback_control *wbc) | |
2146 | { | |
d1310b2e CM |
2147 | struct extent_io_tree *tree; |
2148 | tree = &BTRFS_I(mapping->host)->io_tree; | |
b293f02e CM |
2149 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
2150 | } | |
2151 | ||
3ab2fb5a CM |
2152 | static int |
2153 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
2154 | struct list_head *pages, unsigned nr_pages) | |
2155 | { | |
d1310b2e CM |
2156 | struct extent_io_tree *tree; |
2157 | tree = &BTRFS_I(mapping->host)->io_tree; | |
3ab2fb5a CM |
2158 | return extent_readpages(tree, mapping, pages, nr_pages, |
2159 | btrfs_get_extent); | |
2160 | } | |
2161 | ||
70dec807 | 2162 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
9ebefb18 | 2163 | { |
d1310b2e CM |
2164 | struct extent_io_tree *tree; |
2165 | struct extent_map_tree *map; | |
a52d9a80 | 2166 | int ret; |
8c2383c3 | 2167 | |
d1310b2e CM |
2168 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2169 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
70dec807 | 2170 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
a52d9a80 CM |
2171 | if (ret == 1) { |
2172 | ClearPagePrivate(page); | |
2173 | set_page_private(page, 0); | |
2174 | page_cache_release(page); | |
39279cc3 | 2175 | } |
a52d9a80 | 2176 | return ret; |
39279cc3 CM |
2177 | } |
2178 | ||
a52d9a80 | 2179 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 2180 | { |
d1310b2e | 2181 | struct extent_io_tree *tree; |
39279cc3 | 2182 | |
d1310b2e | 2183 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 CM |
2184 | extent_invalidatepage(tree, page, offset); |
2185 | btrfs_releasepage(page, GFP_NOFS); | |
39279cc3 CM |
2186 | } |
2187 | ||
9ebefb18 CM |
2188 | /* |
2189 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
2190 | * called from a page fault handler when a page is first dirtied. Hence we must | |
2191 | * be careful to check for EOF conditions here. We set the page up correctly | |
2192 | * for a written page which means we get ENOSPC checking when writing into | |
2193 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
2194 | * support these features. | |
2195 | * | |
2196 | * We are not allowed to take the i_mutex here so we have to play games to | |
2197 | * protect against truncate races as the page could now be beyond EOF. Because | |
2198 | * vmtruncate() writes the inode size before removing pages, once we have the | |
2199 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
2200 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
2201 | * unlock the page. | |
2202 | */ | |
2203 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
2204 | { | |
6da6abae | 2205 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
1832a6d5 | 2206 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9ebefb18 CM |
2207 | unsigned long end; |
2208 | loff_t size; | |
1832a6d5 | 2209 | int ret; |
a52d9a80 | 2210 | u64 page_start; |
9ebefb18 | 2211 | |
1832a6d5 CM |
2212 | mutex_lock(&root->fs_info->fs_mutex); |
2213 | ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0); | |
8f662a76 | 2214 | mutex_unlock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2215 | if (ret) |
2216 | goto out; | |
2217 | ||
2218 | ret = -EINVAL; | |
2219 | ||
9ebefb18 CM |
2220 | lock_page(page); |
2221 | wait_on_page_writeback(page); | |
9ebefb18 | 2222 | size = i_size_read(inode); |
35ebb934 | 2223 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 2224 | |
9ebefb18 | 2225 | if ((page->mapping != inode->i_mapping) || |
a52d9a80 | 2226 | (page_start > size)) { |
9ebefb18 CM |
2227 | /* page got truncated out from underneath us */ |
2228 | goto out_unlock; | |
2229 | } | |
2230 | ||
2231 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 2232 | if (page_start + PAGE_CACHE_SIZE > size) |
9ebefb18 CM |
2233 | end = size & ~PAGE_CACHE_MASK; |
2234 | else | |
2235 | end = PAGE_CACHE_SIZE; | |
2236 | ||
b888db2b | 2237 | ret = btrfs_cow_one_page(inode, page, end); |
9ebefb18 CM |
2238 | |
2239 | out_unlock: | |
2240 | unlock_page(page); | |
1832a6d5 | 2241 | out: |
9ebefb18 CM |
2242 | return ret; |
2243 | } | |
2244 | ||
39279cc3 CM |
2245 | static void btrfs_truncate(struct inode *inode) |
2246 | { | |
2247 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2248 | int ret; | |
2249 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 2250 | unsigned long nr; |
39279cc3 CM |
2251 | |
2252 | if (!S_ISREG(inode->i_mode)) | |
2253 | return; | |
2254 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
2255 | return; | |
2256 | ||
2257 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
2258 | ||
2259 | mutex_lock(&root->fs_info->fs_mutex); | |
2260 | trans = btrfs_start_transaction(root, 1); | |
2261 | btrfs_set_trans_block_group(trans, inode); | |
2262 | ||
2263 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
85e21bac CM |
2264 | ret = btrfs_truncate_in_trans(trans, root, inode, |
2265 | BTRFS_EXTENT_DATA_KEY); | |
39279cc3 | 2266 | btrfs_update_inode(trans, root, inode); |
d3c2fdcf | 2267 | nr = trans->blocks_used; |
5f39d397 | 2268 | |
39279cc3 CM |
2269 | ret = btrfs_end_transaction(trans, root); |
2270 | BUG_ON(ret); | |
2271 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 2272 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2273 | btrfs_throttle(root); |
39279cc3 CM |
2274 | } |
2275 | ||
4313b399 CM |
2276 | static int noinline create_subvol(struct btrfs_root *root, char *name, |
2277 | int namelen) | |
39279cc3 CM |
2278 | { |
2279 | struct btrfs_trans_handle *trans; | |
2280 | struct btrfs_key key; | |
2281 | struct btrfs_root_item root_item; | |
2282 | struct btrfs_inode_item *inode_item; | |
5f39d397 | 2283 | struct extent_buffer *leaf; |
dc17ff8f | 2284 | struct btrfs_root *new_root = root; |
39279cc3 CM |
2285 | struct inode *inode; |
2286 | struct inode *dir; | |
2287 | int ret; | |
54aa1f4d | 2288 | int err; |
39279cc3 CM |
2289 | u64 objectid; |
2290 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
d3c2fdcf | 2291 | unsigned long nr = 1; |
39279cc3 CM |
2292 | |
2293 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2294 | ret = btrfs_check_free_space(root, 1, 0); |
2295 | if (ret) | |
2296 | goto fail_commit; | |
2297 | ||
39279cc3 CM |
2298 | trans = btrfs_start_transaction(root, 1); |
2299 | BUG_ON(!trans); | |
2300 | ||
7bb86316 CM |
2301 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2302 | 0, &objectid); | |
2303 | if (ret) | |
2304 | goto fail; | |
2305 | ||
2306 | leaf = __btrfs_alloc_free_block(trans, root, root->leafsize, | |
2307 | objectid, trans->transid, 0, 0, | |
2308 | 0, 0); | |
5f39d397 CM |
2309 | if (IS_ERR(leaf)) |
2310 | return PTR_ERR(leaf); | |
2311 | ||
2312 | btrfs_set_header_nritems(leaf, 0); | |
2313 | btrfs_set_header_level(leaf, 0); | |
db94535d | 2314 | btrfs_set_header_bytenr(leaf, leaf->start); |
5f39d397 | 2315 | btrfs_set_header_generation(leaf, trans->transid); |
7bb86316 CM |
2316 | btrfs_set_header_owner(leaf, objectid); |
2317 | ||
5f39d397 CM |
2318 | write_extent_buffer(leaf, root->fs_info->fsid, |
2319 | (unsigned long)btrfs_header_fsid(leaf), | |
2320 | BTRFS_FSID_SIZE); | |
2321 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 CM |
2322 | |
2323 | inode_item = &root_item.inode; | |
2324 | memset(inode_item, 0, sizeof(*inode_item)); | |
5f39d397 CM |
2325 | inode_item->generation = cpu_to_le64(1); |
2326 | inode_item->size = cpu_to_le64(3); | |
2327 | inode_item->nlink = cpu_to_le32(1); | |
2328 | inode_item->nblocks = cpu_to_le64(1); | |
2329 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); | |
39279cc3 | 2330 | |
db94535d CM |
2331 | btrfs_set_root_bytenr(&root_item, leaf->start); |
2332 | btrfs_set_root_level(&root_item, 0); | |
39279cc3 | 2333 | btrfs_set_root_refs(&root_item, 1); |
5f39d397 CM |
2334 | btrfs_set_root_used(&root_item, 0); |
2335 | ||
5eda7b5e CM |
2336 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
2337 | root_item.drop_level = 0; | |
5f39d397 CM |
2338 | |
2339 | free_extent_buffer(leaf); | |
2340 | leaf = NULL; | |
39279cc3 | 2341 | |
39279cc3 CM |
2342 | btrfs_set_root_dirid(&root_item, new_dirid); |
2343 | ||
2344 | key.objectid = objectid; | |
2345 | key.offset = 1; | |
39279cc3 CM |
2346 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
2347 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2348 | &root_item); | |
54aa1f4d CM |
2349 | if (ret) |
2350 | goto fail; | |
39279cc3 CM |
2351 | |
2352 | /* | |
2353 | * insert the directory item | |
2354 | */ | |
2355 | key.offset = (u64)-1; | |
2356 | dir = root->fs_info->sb->s_root->d_inode; | |
2357 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2358 | name, namelen, dir->i_ino, &key, | |
2359 | BTRFS_FT_DIR); | |
54aa1f4d CM |
2360 | if (ret) |
2361 | goto fail; | |
39279cc3 | 2362 | |
3954401f CM |
2363 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, |
2364 | name, namelen, objectid, | |
2365 | root->fs_info->sb->s_root->d_inode->i_ino); | |
2366 | if (ret) | |
2367 | goto fail; | |
2368 | ||
39279cc3 | 2369 | ret = btrfs_commit_transaction(trans, root); |
54aa1f4d CM |
2370 | if (ret) |
2371 | goto fail_commit; | |
39279cc3 | 2372 | |
58176a96 | 2373 | new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); |
39279cc3 CM |
2374 | BUG_ON(!new_root); |
2375 | ||
2376 | trans = btrfs_start_transaction(new_root, 1); | |
2377 | BUG_ON(!trans); | |
2378 | ||
9c58309d CM |
2379 | inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid, |
2380 | new_dirid, | |
39279cc3 | 2381 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); |
54aa1f4d CM |
2382 | if (IS_ERR(inode)) |
2383 | goto fail; | |
39279cc3 CM |
2384 | inode->i_op = &btrfs_dir_inode_operations; |
2385 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 2386 | new_root->inode = inode; |
39279cc3 | 2387 | |
3954401f CM |
2388 | ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid, |
2389 | new_dirid); | |
39279cc3 | 2390 | inode->i_nlink = 1; |
3954401f | 2391 | inode->i_size = 0; |
39279cc3 | 2392 | ret = btrfs_update_inode(trans, new_root, inode); |
54aa1f4d CM |
2393 | if (ret) |
2394 | goto fail; | |
2395 | fail: | |
d3c2fdcf | 2396 | nr = trans->blocks_used; |
dc17ff8f | 2397 | err = btrfs_commit_transaction(trans, new_root); |
54aa1f4d CM |
2398 | if (err && !ret) |
2399 | ret = err; | |
2400 | fail_commit: | |
39279cc3 | 2401 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2402 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2403 | btrfs_throttle(root); |
54aa1f4d | 2404 | return ret; |
39279cc3 CM |
2405 | } |
2406 | ||
2407 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) | |
2408 | { | |
3063d29f | 2409 | struct btrfs_pending_snapshot *pending_snapshot; |
39279cc3 | 2410 | struct btrfs_trans_handle *trans; |
39279cc3 | 2411 | int ret; |
54aa1f4d | 2412 | int err; |
1832a6d5 | 2413 | unsigned long nr = 0; |
39279cc3 CM |
2414 | |
2415 | if (!root->ref_cows) | |
2416 | return -EINVAL; | |
2417 | ||
2418 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2419 | ret = btrfs_check_free_space(root, 1, 0); |
2420 | if (ret) | |
2421 | goto fail_unlock; | |
2422 | ||
3063d29f CM |
2423 | pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS); |
2424 | if (!pending_snapshot) { | |
2425 | ret = -ENOMEM; | |
2426 | goto fail_unlock; | |
2427 | } | |
fb4bc1e0 | 2428 | pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); |
3063d29f CM |
2429 | if (!pending_snapshot->name) { |
2430 | ret = -ENOMEM; | |
2431 | kfree(pending_snapshot); | |
2432 | goto fail_unlock; | |
2433 | } | |
fb4bc1e0 Y |
2434 | memcpy(pending_snapshot->name, name, namelen); |
2435 | pending_snapshot->name[namelen] = '\0'; | |
39279cc3 CM |
2436 | trans = btrfs_start_transaction(root, 1); |
2437 | BUG_ON(!trans); | |
3063d29f CM |
2438 | pending_snapshot->root = root; |
2439 | list_add(&pending_snapshot->list, | |
2440 | &trans->transaction->pending_snapshots); | |
39279cc3 | 2441 | ret = btrfs_update_inode(trans, root, root->inode); |
54aa1f4d | 2442 | err = btrfs_commit_transaction(trans, root); |
5f39d397 | 2443 | |
1832a6d5 | 2444 | fail_unlock: |
39279cc3 | 2445 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2446 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2447 | btrfs_throttle(root); |
54aa1f4d | 2448 | return ret; |
39279cc3 CM |
2449 | } |
2450 | ||
edbd8d4e | 2451 | unsigned long btrfs_force_ra(struct address_space *mapping, |
86479a04 CM |
2452 | struct file_ra_state *ra, struct file *file, |
2453 | pgoff_t offset, pgoff_t last_index) | |
2454 | { | |
2455 | pgoff_t req_size; | |
2456 | ||
2457 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2458 | req_size = last_index - offset + 1; | |
2459 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); | |
2460 | return offset; | |
2461 | #else | |
2462 | req_size = min(last_index - offset + 1, (pgoff_t)128); | |
2463 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); | |
2464 | return offset + req_size; | |
2465 | #endif | |
2466 | } | |
2467 | ||
2468 | int btrfs_defrag_file(struct file *file) { | |
6da6abae | 2469 | struct inode *inode = fdentry(file)->d_inode; |
1832a6d5 | 2470 | struct btrfs_root *root = BTRFS_I(inode)->root; |
d1310b2e | 2471 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
86479a04 CM |
2472 | struct page *page; |
2473 | unsigned long last_index; | |
2474 | unsigned long ra_index = 0; | |
2475 | u64 page_start; | |
2476 | u64 page_end; | |
2477 | unsigned long i; | |
1832a6d5 CM |
2478 | int ret; |
2479 | ||
2480 | mutex_lock(&root->fs_info->fs_mutex); | |
2481 | ret = btrfs_check_free_space(root, inode->i_size, 0); | |
2482 | mutex_unlock(&root->fs_info->fs_mutex); | |
2483 | if (ret) | |
2484 | return -ENOSPC; | |
86479a04 CM |
2485 | |
2486 | mutex_lock(&inode->i_mutex); | |
2487 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
2488 | for (i = 0; i <= last_index; i++) { | |
2489 | if (i == ra_index) { | |
edbd8d4e CM |
2490 | ra_index = btrfs_force_ra(inode->i_mapping, |
2491 | &file->f_ra, | |
2492 | file, ra_index, last_index); | |
86479a04 CM |
2493 | } |
2494 | page = grab_cache_page(inode->i_mapping, i); | |
2495 | if (!page) | |
2496 | goto out_unlock; | |
2497 | if (!PageUptodate(page)) { | |
2498 | btrfs_readpage(NULL, page); | |
2499 | lock_page(page); | |
2500 | if (!PageUptodate(page)) { | |
2501 | unlock_page(page); | |
2502 | page_cache_release(page); | |
2503 | goto out_unlock; | |
2504 | } | |
2505 | } | |
35ebb934 | 2506 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
86479a04 CM |
2507 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
2508 | ||
d1310b2e | 2509 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
d1310b2e | 2510 | set_extent_delalloc(io_tree, page_start, |
86479a04 | 2511 | page_end, GFP_NOFS); |
edbd8d4e | 2512 | |
d1310b2e | 2513 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
86479a04 CM |
2514 | set_page_dirty(page); |
2515 | unlock_page(page); | |
2516 | page_cache_release(page); | |
2517 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
2518 | } | |
2519 | ||
2520 | out_unlock: | |
2521 | mutex_unlock(&inode->i_mutex); | |
2522 | return 0; | |
2523 | } | |
2524 | ||
edbd8d4e CM |
2525 | static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) |
2526 | { | |
2527 | u64 new_size; | |
2528 | u64 old_size; | |
2529 | struct btrfs_ioctl_vol_args *vol_args; | |
2530 | struct btrfs_trans_handle *trans; | |
2531 | char *sizestr; | |
2532 | int ret = 0; | |
2533 | int namelen; | |
2534 | int mod = 0; | |
2535 | ||
2536 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); | |
2537 | ||
2538 | if (!vol_args) | |
2539 | return -ENOMEM; | |
2540 | ||
2541 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
2542 | ret = -EFAULT; | |
2543 | goto out; | |
2544 | } | |
2545 | namelen = strlen(vol_args->name); | |
2546 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
2547 | ret = -EINVAL; | |
2548 | goto out; | |
2549 | } | |
2550 | ||
2551 | sizestr = vol_args->name; | |
2552 | if (!strcmp(sizestr, "max")) | |
2553 | new_size = root->fs_info->sb->s_bdev->bd_inode->i_size; | |
2554 | else { | |
2555 | if (sizestr[0] == '-') { | |
2556 | mod = -1; | |
2557 | sizestr++; | |
2558 | } else if (sizestr[0] == '+') { | |
2559 | mod = 1; | |
2560 | sizestr++; | |
2561 | } | |
2562 | new_size = btrfs_parse_size(sizestr); | |
2563 | if (new_size == 0) { | |
2564 | ret = -EINVAL; | |
2565 | goto out; | |
2566 | } | |
2567 | } | |
2568 | ||
2569 | mutex_lock(&root->fs_info->fs_mutex); | |
2570 | old_size = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
2571 | ||
2572 | if (mod < 0) { | |
2573 | if (new_size > old_size) { | |
2574 | ret = -EINVAL; | |
2575 | goto out_unlock; | |
2576 | } | |
2577 | new_size = old_size - new_size; | |
2578 | } else if (mod > 0) { | |
2579 | new_size = old_size + new_size; | |
2580 | } | |
2581 | ||
2582 | if (new_size < 256 * 1024 * 1024) { | |
2583 | ret = -EINVAL; | |
2584 | goto out_unlock; | |
2585 | } | |
2586 | if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) { | |
2587 | ret = -EFBIG; | |
2588 | goto out_unlock; | |
2589 | } | |
f9ef6604 CM |
2590 | |
2591 | do_div(new_size, root->sectorsize); | |
2592 | new_size *= root->sectorsize; | |
edbd8d4e CM |
2593 | |
2594 | printk("new size is %Lu\n", new_size); | |
2595 | if (new_size > old_size) { | |
2596 | trans = btrfs_start_transaction(root, 1); | |
2597 | ret = btrfs_grow_extent_tree(trans, root, new_size); | |
2598 | btrfs_commit_transaction(trans, root); | |
2599 | } else { | |
2600 | ret = btrfs_shrink_extent_tree(root, new_size); | |
2601 | } | |
2602 | ||
2603 | out_unlock: | |
2604 | mutex_unlock(&root->fs_info->fs_mutex); | |
2605 | out: | |
2606 | kfree(vol_args); | |
2607 | return ret; | |
2608 | } | |
2609 | ||
4313b399 CM |
2610 | static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root, |
2611 | void __user *arg) | |
39279cc3 | 2612 | { |
4aec2b52 | 2613 | struct btrfs_ioctl_vol_args *vol_args; |
39279cc3 | 2614 | struct btrfs_dir_item *di; |
39279cc3 CM |
2615 | struct btrfs_path *path; |
2616 | u64 root_dirid; | |
4aec2b52 CM |
2617 | int namelen; |
2618 | int ret; | |
39279cc3 | 2619 | |
4aec2b52 | 2620 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
5f39d397 | 2621 | |
4aec2b52 CM |
2622 | if (!vol_args) |
2623 | return -ENOMEM; | |
2624 | ||
2625 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
2626 | ret = -EFAULT; | |
2627 | goto out; | |
2628 | } | |
2629 | ||
2630 | namelen = strlen(vol_args->name); | |
2631 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
2632 | ret = -EINVAL; | |
2633 | goto out; | |
2634 | } | |
2635 | if (strchr(vol_args->name, '/')) { | |
2636 | ret = -EINVAL; | |
2637 | goto out; | |
2638 | } | |
d03581f4 CH |
2639 | |
2640 | path = btrfs_alloc_path(); | |
4aec2b52 CM |
2641 | if (!path) { |
2642 | ret = -ENOMEM; | |
2643 | goto out; | |
2644 | } | |
d03581f4 CH |
2645 | |
2646 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
2647 | mutex_lock(&root->fs_info->fs_mutex); | |
2648 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, | |
2649 | path, root_dirid, | |
4aec2b52 | 2650 | vol_args->name, namelen, 0); |
d03581f4 CH |
2651 | mutex_unlock(&root->fs_info->fs_mutex); |
2652 | btrfs_free_path(path); | |
4aec2b52 CM |
2653 | |
2654 | if (di && !IS_ERR(di)) { | |
2655 | ret = -EEXIST; | |
2656 | goto out; | |
2657 | } | |
2658 | ||
2659 | if (IS_ERR(di)) { | |
2660 | ret = PTR_ERR(di); | |
2661 | goto out; | |
2662 | } | |
d03581f4 CH |
2663 | |
2664 | if (root == root->fs_info->tree_root) | |
4aec2b52 CM |
2665 | ret = create_subvol(root, vol_args->name, namelen); |
2666 | else | |
2667 | ret = create_snapshot(root, vol_args->name, namelen); | |
2668 | out: | |
2669 | kfree(vol_args); | |
2670 | return ret; | |
d03581f4 CH |
2671 | } |
2672 | ||
2673 | static int btrfs_ioctl_defrag(struct file *file) | |
2674 | { | |
6da6abae | 2675 | struct inode *inode = fdentry(file)->d_inode; |
d03581f4 CH |
2676 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2677 | ||
2678 | switch (inode->i_mode & S_IFMT) { | |
2679 | case S_IFDIR: | |
39279cc3 | 2680 | mutex_lock(&root->fs_info->fs_mutex); |
d03581f4 CH |
2681 | btrfs_defrag_root(root, 0); |
2682 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
39279cc3 | 2683 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 | 2684 | break; |
d03581f4 CH |
2685 | case S_IFREG: |
2686 | btrfs_defrag_file(file); | |
2687 | break; | |
2688 | } | |
2689 | ||
2690 | return 0; | |
2691 | } | |
6702ed49 | 2692 | |
d03581f4 CH |
2693 | long btrfs_ioctl(struct file *file, unsigned int |
2694 | cmd, unsigned long arg) | |
2695 | { | |
6da6abae | 2696 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
d03581f4 CH |
2697 | |
2698 | switch (cmd) { | |
2699 | case BTRFS_IOC_SNAP_CREATE: | |
2700 | return btrfs_ioctl_snap_create(root, (void __user *)arg); | |
6702ed49 | 2701 | case BTRFS_IOC_DEFRAG: |
d03581f4 | 2702 | return btrfs_ioctl_defrag(file); |
edbd8d4e CM |
2703 | case BTRFS_IOC_RESIZE: |
2704 | return btrfs_ioctl_resize(root, (void __user *)arg); | |
39279cc3 | 2705 | } |
d03581f4 CH |
2706 | |
2707 | return -ENOTTY; | |
39279cc3 CM |
2708 | } |
2709 | ||
39279cc3 CM |
2710 | /* |
2711 | * Called inside transaction, so use GFP_NOFS | |
2712 | */ | |
2713 | struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2714 | { | |
2715 | struct btrfs_inode *ei; | |
2716 | ||
2717 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2718 | if (!ei) | |
2719 | return NULL; | |
15ee9bc7 | 2720 | ei->last_trans = 0; |
dc17ff8f | 2721 | ei->ordered_trans = 0; |
39279cc3 CM |
2722 | return &ei->vfs_inode; |
2723 | } | |
2724 | ||
2725 | void btrfs_destroy_inode(struct inode *inode) | |
2726 | { | |
2727 | WARN_ON(!list_empty(&inode->i_dentry)); | |
2728 | WARN_ON(inode->i_data.nrpages); | |
2729 | ||
8c416c9e | 2730 | btrfs_drop_extent_cache(inode, 0, (u64)-1); |
39279cc3 CM |
2731 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
2732 | } | |
2733 | ||
44ec0b71 CM |
2734 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2735 | static void init_once(struct kmem_cache * cachep, void *foo) | |
2736 | #else | |
39279cc3 CM |
2737 | static void init_once(void * foo, struct kmem_cache * cachep, |
2738 | unsigned long flags) | |
44ec0b71 | 2739 | #endif |
39279cc3 CM |
2740 | { |
2741 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2742 | ||
2743 | inode_init_once(&ei->vfs_inode); | |
2744 | } | |
2745 | ||
2746 | void btrfs_destroy_cachep(void) | |
2747 | { | |
2748 | if (btrfs_inode_cachep) | |
2749 | kmem_cache_destroy(btrfs_inode_cachep); | |
2750 | if (btrfs_trans_handle_cachep) | |
2751 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2752 | if (btrfs_transaction_cachep) | |
2753 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2754 | if (btrfs_bit_radix_cachep) | |
2755 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2756 | if (btrfs_path_cachep) | |
2757 | kmem_cache_destroy(btrfs_path_cachep); | |
2758 | } | |
2759 | ||
86479a04 | 2760 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d | 2761 | unsigned long extra_flags, |
44ec0b71 CM |
2762 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2763 | void (*ctor)(struct kmem_cache *, void *) | |
2764 | #else | |
92fee66d | 2765 | void (*ctor)(void *, struct kmem_cache *, |
44ec0b71 CM |
2766 | unsigned long) |
2767 | #endif | |
2768 | ) | |
92fee66d CM |
2769 | { |
2770 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
2771 | SLAB_MEM_SPREAD | extra_flags), ctor | |
2772 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2773 | ,NULL | |
2774 | #endif | |
2775 | ); | |
2776 | } | |
2777 | ||
39279cc3 CM |
2778 | int btrfs_init_cachep(void) |
2779 | { | |
86479a04 | 2780 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
2781 | sizeof(struct btrfs_inode), |
2782 | 0, init_once); | |
39279cc3 CM |
2783 | if (!btrfs_inode_cachep) |
2784 | goto fail; | |
86479a04 CM |
2785 | btrfs_trans_handle_cachep = |
2786 | btrfs_cache_create("btrfs_trans_handle_cache", | |
2787 | sizeof(struct btrfs_trans_handle), | |
2788 | 0, NULL); | |
39279cc3 CM |
2789 | if (!btrfs_trans_handle_cachep) |
2790 | goto fail; | |
86479a04 | 2791 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 2792 | sizeof(struct btrfs_transaction), |
92fee66d | 2793 | 0, NULL); |
39279cc3 CM |
2794 | if (!btrfs_transaction_cachep) |
2795 | goto fail; | |
86479a04 | 2796 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 2797 | sizeof(struct btrfs_path), |
92fee66d | 2798 | 0, NULL); |
39279cc3 CM |
2799 | if (!btrfs_path_cachep) |
2800 | goto fail; | |
86479a04 | 2801 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 2802 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
2803 | if (!btrfs_bit_radix_cachep) |
2804 | goto fail; | |
2805 | return 0; | |
2806 | fail: | |
2807 | btrfs_destroy_cachep(); | |
2808 | return -ENOMEM; | |
2809 | } | |
2810 | ||
2811 | static int btrfs_getattr(struct vfsmount *mnt, | |
2812 | struct dentry *dentry, struct kstat *stat) | |
2813 | { | |
2814 | struct inode *inode = dentry->d_inode; | |
2815 | generic_fillattr(inode, stat); | |
d6667462 | 2816 | stat->blksize = PAGE_CACHE_SIZE; |
9069218d | 2817 | stat->blocks = inode->i_blocks + (BTRFS_I(inode)->delalloc_bytes >> 9); |
39279cc3 CM |
2818 | return 0; |
2819 | } | |
2820 | ||
2821 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
2822 | struct inode * new_dir,struct dentry *new_dentry) | |
2823 | { | |
2824 | struct btrfs_trans_handle *trans; | |
2825 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2826 | struct inode *new_inode = new_dentry->d_inode; | |
2827 | struct inode *old_inode = old_dentry->d_inode; | |
2828 | struct timespec ctime = CURRENT_TIME; | |
2829 | struct btrfs_path *path; | |
39279cc3 CM |
2830 | int ret; |
2831 | ||
2832 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2833 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2834 | return -ENOTEMPTY; | |
2835 | } | |
5f39d397 | 2836 | |
39279cc3 | 2837 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2838 | ret = btrfs_check_free_space(root, 1, 0); |
2839 | if (ret) | |
2840 | goto out_unlock; | |
2841 | ||
39279cc3 | 2842 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 2843 | |
39279cc3 CM |
2844 | btrfs_set_trans_block_group(trans, new_dir); |
2845 | path = btrfs_alloc_path(); | |
2846 | if (!path) { | |
2847 | ret = -ENOMEM; | |
2848 | goto out_fail; | |
2849 | } | |
2850 | ||
2851 | old_dentry->d_inode->i_nlink++; | |
2852 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2853 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2854 | old_inode->i_ctime = ctime; | |
5f39d397 | 2855 | |
39279cc3 CM |
2856 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
2857 | if (ret) | |
2858 | goto out_fail; | |
2859 | ||
2860 | if (new_inode) { | |
2861 | new_inode->i_ctime = CURRENT_TIME; | |
2862 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
2863 | if (ret) | |
2864 | goto out_fail; | |
39279cc3 | 2865 | } |
9c58309d | 2866 | ret = btrfs_add_link(trans, new_dentry, old_inode, 1); |
39279cc3 CM |
2867 | if (ret) |
2868 | goto out_fail; | |
2869 | ||
2870 | out_fail: | |
2871 | btrfs_free_path(path); | |
2872 | btrfs_end_transaction(trans, root); | |
1832a6d5 | 2873 | out_unlock: |
39279cc3 CM |
2874 | mutex_unlock(&root->fs_info->fs_mutex); |
2875 | return ret; | |
2876 | } | |
2877 | ||
2878 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
2879 | const char *symname) | |
2880 | { | |
2881 | struct btrfs_trans_handle *trans; | |
2882 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2883 | struct btrfs_path *path; | |
2884 | struct btrfs_key key; | |
1832a6d5 | 2885 | struct inode *inode = NULL; |
39279cc3 CM |
2886 | int err; |
2887 | int drop_inode = 0; | |
2888 | u64 objectid; | |
2889 | int name_len; | |
2890 | int datasize; | |
5f39d397 | 2891 | unsigned long ptr; |
39279cc3 | 2892 | struct btrfs_file_extent_item *ei; |
5f39d397 | 2893 | struct extent_buffer *leaf; |
1832a6d5 | 2894 | unsigned long nr = 0; |
39279cc3 CM |
2895 | |
2896 | name_len = strlen(symname) + 1; | |
2897 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2898 | return -ENAMETOOLONG; | |
1832a6d5 | 2899 | |
39279cc3 | 2900 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2901 | err = btrfs_check_free_space(root, 1, 0); |
2902 | if (err) | |
2903 | goto out_fail; | |
2904 | ||
39279cc3 CM |
2905 | trans = btrfs_start_transaction(root, 1); |
2906 | btrfs_set_trans_block_group(trans, dir); | |
2907 | ||
2908 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2909 | if (err) { | |
2910 | err = -ENOSPC; | |
2911 | goto out_unlock; | |
2912 | } | |
2913 | ||
9c58309d CM |
2914 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
2915 | dentry->d_name.len, | |
2916 | dentry->d_parent->d_inode->i_ino, objectid, | |
39279cc3 CM |
2917 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); |
2918 | err = PTR_ERR(inode); | |
2919 | if (IS_ERR(inode)) | |
2920 | goto out_unlock; | |
2921 | ||
2922 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 2923 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
39279cc3 CM |
2924 | if (err) |
2925 | drop_inode = 1; | |
2926 | else { | |
2927 | inode->i_mapping->a_ops = &btrfs_aops; | |
2928 | inode->i_fop = &btrfs_file_operations; | |
2929 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
2930 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
2931 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 2932 | inode->i_mapping, GFP_NOFS); |
9069218d | 2933 | BTRFS_I(inode)->delalloc_bytes = 0; |
d1310b2e | 2934 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
2935 | } |
2936 | dir->i_sb->s_dirt = 1; | |
2937 | btrfs_update_inode_block_group(trans, inode); | |
2938 | btrfs_update_inode_block_group(trans, dir); | |
2939 | if (drop_inode) | |
2940 | goto out_unlock; | |
2941 | ||
2942 | path = btrfs_alloc_path(); | |
2943 | BUG_ON(!path); | |
2944 | key.objectid = inode->i_ino; | |
2945 | key.offset = 0; | |
39279cc3 CM |
2946 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
2947 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2948 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2949 | datasize); | |
54aa1f4d CM |
2950 | if (err) { |
2951 | drop_inode = 1; | |
2952 | goto out_unlock; | |
2953 | } | |
5f39d397 CM |
2954 | leaf = path->nodes[0]; |
2955 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
2956 | struct btrfs_file_extent_item); | |
2957 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
2958 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
2959 | BTRFS_FILE_EXTENT_INLINE); |
2960 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
2961 | write_extent_buffer(leaf, symname, ptr, name_len); |
2962 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 2963 | btrfs_free_path(path); |
5f39d397 | 2964 | |
39279cc3 CM |
2965 | inode->i_op = &btrfs_symlink_inode_operations; |
2966 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
2967 | inode->i_size = name_len - 1; | |
54aa1f4d CM |
2968 | err = btrfs_update_inode(trans, root, inode); |
2969 | if (err) | |
2970 | drop_inode = 1; | |
39279cc3 CM |
2971 | |
2972 | out_unlock: | |
d3c2fdcf | 2973 | nr = trans->blocks_used; |
39279cc3 | 2974 | btrfs_end_transaction(trans, root); |
1832a6d5 | 2975 | out_fail: |
39279cc3 | 2976 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 CM |
2977 | if (drop_inode) { |
2978 | inode_dec_link_count(inode); | |
2979 | iput(inode); | |
2980 | } | |
d3c2fdcf | 2981 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2982 | btrfs_throttle(root); |
39279cc3 CM |
2983 | return err; |
2984 | } | |
fdebe2bd Y |
2985 | static int btrfs_permission(struct inode *inode, int mask, |
2986 | struct nameidata *nd) | |
2987 | { | |
2988 | if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE)) | |
2989 | return -EACCES; | |
2990 | return generic_permission(inode, mask, NULL); | |
2991 | } | |
39279cc3 CM |
2992 | |
2993 | static struct inode_operations btrfs_dir_inode_operations = { | |
2994 | .lookup = btrfs_lookup, | |
2995 | .create = btrfs_create, | |
2996 | .unlink = btrfs_unlink, | |
2997 | .link = btrfs_link, | |
2998 | .mkdir = btrfs_mkdir, | |
2999 | .rmdir = btrfs_rmdir, | |
3000 | .rename = btrfs_rename, | |
3001 | .symlink = btrfs_symlink, | |
3002 | .setattr = btrfs_setattr, | |
618e21d5 | 3003 | .mknod = btrfs_mknod, |
5103e947 JB |
3004 | .setxattr = generic_setxattr, |
3005 | .getxattr = generic_getxattr, | |
3006 | .listxattr = btrfs_listxattr, | |
3007 | .removexattr = generic_removexattr, | |
fdebe2bd | 3008 | .permission = btrfs_permission, |
39279cc3 | 3009 | }; |
39279cc3 CM |
3010 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
3011 | .lookup = btrfs_lookup, | |
fdebe2bd | 3012 | .permission = btrfs_permission, |
39279cc3 | 3013 | }; |
39279cc3 CM |
3014 | static struct file_operations btrfs_dir_file_operations = { |
3015 | .llseek = generic_file_llseek, | |
3016 | .read = generic_read_dir, | |
3017 | .readdir = btrfs_readdir, | |
34287aa3 | 3018 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 3019 | #ifdef CONFIG_COMPAT |
34287aa3 | 3020 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
3021 | #endif |
3022 | }; | |
3023 | ||
d1310b2e | 3024 | static struct extent_io_ops btrfs_extent_io_ops = { |
07157aac | 3025 | .fill_delalloc = run_delalloc_range, |
065631f6 | 3026 | .submit_bio_hook = btrfs_submit_bio_hook, |
07157aac CM |
3027 | .readpage_io_hook = btrfs_readpage_io_hook, |
3028 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
b0c68f8b CM |
3029 | .set_bit_hook = btrfs_set_bit_hook, |
3030 | .clear_bit_hook = btrfs_clear_bit_hook, | |
07157aac CM |
3031 | }; |
3032 | ||
39279cc3 CM |
3033 | static struct address_space_operations btrfs_aops = { |
3034 | .readpage = btrfs_readpage, | |
3035 | .writepage = btrfs_writepage, | |
b293f02e | 3036 | .writepages = btrfs_writepages, |
3ab2fb5a | 3037 | .readpages = btrfs_readpages, |
39279cc3 | 3038 | .sync_page = block_sync_page, |
39279cc3 | 3039 | .bmap = btrfs_bmap, |
a52d9a80 CM |
3040 | .invalidatepage = btrfs_invalidatepage, |
3041 | .releasepage = btrfs_releasepage, | |
3042 | .set_page_dirty = __set_page_dirty_nobuffers, | |
39279cc3 CM |
3043 | }; |
3044 | ||
3045 | static struct address_space_operations btrfs_symlink_aops = { | |
3046 | .readpage = btrfs_readpage, | |
3047 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
3048 | .invalidatepage = btrfs_invalidatepage, |
3049 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
3050 | }; |
3051 | ||
3052 | static struct inode_operations btrfs_file_inode_operations = { | |
3053 | .truncate = btrfs_truncate, | |
3054 | .getattr = btrfs_getattr, | |
3055 | .setattr = btrfs_setattr, | |
5103e947 JB |
3056 | .setxattr = generic_setxattr, |
3057 | .getxattr = generic_getxattr, | |
3058 | .listxattr = btrfs_listxattr, | |
3059 | .removexattr = generic_removexattr, | |
fdebe2bd | 3060 | .permission = btrfs_permission, |
39279cc3 | 3061 | }; |
618e21d5 JB |
3062 | static struct inode_operations btrfs_special_inode_operations = { |
3063 | .getattr = btrfs_getattr, | |
3064 | .setattr = btrfs_setattr, | |
fdebe2bd | 3065 | .permission = btrfs_permission, |
618e21d5 | 3066 | }; |
39279cc3 CM |
3067 | static struct inode_operations btrfs_symlink_inode_operations = { |
3068 | .readlink = generic_readlink, | |
3069 | .follow_link = page_follow_link_light, | |
3070 | .put_link = page_put_link, | |
fdebe2bd | 3071 | .permission = btrfs_permission, |
39279cc3 | 3072 | }; |