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 | ||
a74a4b97 | 19 | #include <linux/version.h> |
e20d96d6 | 20 | #include <linux/fs.h> |
d98237b3 | 21 | #include <linux/blkdev.h> |
87cbda5c | 22 | #include <linux/scatterlist.h> |
22b0ebda | 23 | #include <linux/swap.h> |
0f7d52f4 | 24 | #include <linux/radix-tree.h> |
35b7e476 | 25 | #include <linux/writeback.h> |
5f39d397 | 26 | #include <linux/buffer_head.h> // for block_sync_page |
ce9adaa5 | 27 | #include <linux/workqueue.h> |
a74a4b97 | 28 | #include <linux/kthread.h> |
a74a4b97 | 29 | # include <linux/freezer.h> |
a5eb62e3 | 30 | #include "crc32c.h" |
eb60ceac CM |
31 | #include "ctree.h" |
32 | #include "disk-io.h" | |
e089f05c | 33 | #include "transaction.h" |
0f7d52f4 | 34 | #include "btrfs_inode.h" |
0b86a832 | 35 | #include "volumes.h" |
db94535d | 36 | #include "print-tree.h" |
8b712842 | 37 | #include "async-thread.h" |
925baedd | 38 | #include "locking.h" |
017e5369 | 39 | #include "ref-cache.h" |
e02119d5 | 40 | #include "tree-log.h" |
eb60ceac | 41 | |
5f39d397 CM |
42 | #if 0 |
43 | static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf) | |
7eccb903 | 44 | { |
5f39d397 CM |
45 | if (extent_buffer_blocknr(buf) != btrfs_header_blocknr(buf)) { |
46 | printk(KERN_CRIT "buf blocknr(buf) is %llu, header is %llu\n", | |
47 | (unsigned long long)extent_buffer_blocknr(buf), | |
48 | (unsigned long long)btrfs_header_blocknr(buf)); | |
39279cc3 | 49 | return 1; |
d98237b3 | 50 | } |
9a8dd150 | 51 | return 0; |
eb60ceac | 52 | } |
5f39d397 | 53 | #endif |
eb60ceac | 54 | |
d1310b2e | 55 | static struct extent_io_ops btree_extent_io_ops; |
8b712842 | 56 | static void end_workqueue_fn(struct btrfs_work *work); |
ce9adaa5 | 57 | |
d352ac68 CM |
58 | /* |
59 | * end_io_wq structs are used to do processing in task context when an IO is | |
60 | * complete. This is used during reads to verify checksums, and it is used | |
61 | * by writes to insert metadata for new file extents after IO is complete. | |
62 | */ | |
ce9adaa5 CM |
63 | struct end_io_wq { |
64 | struct bio *bio; | |
65 | bio_end_io_t *end_io; | |
66 | void *private; | |
67 | struct btrfs_fs_info *info; | |
68 | int error; | |
22c59948 | 69 | int metadata; |
ce9adaa5 | 70 | struct list_head list; |
8b712842 | 71 | struct btrfs_work work; |
ce9adaa5 | 72 | }; |
0da5468f | 73 | |
d352ac68 CM |
74 | /* |
75 | * async submit bios are used to offload expensive checksumming | |
76 | * onto the worker threads. They checksum file and metadata bios | |
77 | * just before they are sent down the IO stack. | |
78 | */ | |
44b8bd7e CM |
79 | struct async_submit_bio { |
80 | struct inode *inode; | |
81 | struct bio *bio; | |
82 | struct list_head list; | |
83 | extent_submit_bio_hook_t *submit_bio_hook; | |
84 | int rw; | |
85 | int mirror_num; | |
c8b97818 | 86 | unsigned long bio_flags; |
8b712842 | 87 | struct btrfs_work work; |
44b8bd7e CM |
88 | }; |
89 | ||
d352ac68 CM |
90 | /* |
91 | * extents on the btree inode are pretty simple, there's one extent | |
92 | * that covers the entire device | |
93 | */ | |
5f39d397 | 94 | struct extent_map *btree_get_extent(struct inode *inode, struct page *page, |
d1310b2e | 95 | size_t page_offset, u64 start, u64 len, |
5f39d397 | 96 | int create) |
7eccb903 | 97 | { |
5f39d397 CM |
98 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
99 | struct extent_map *em; | |
100 | int ret; | |
101 | ||
d1310b2e CM |
102 | spin_lock(&em_tree->lock); |
103 | em = lookup_extent_mapping(em_tree, start, len); | |
a061fc8d CM |
104 | if (em) { |
105 | em->bdev = | |
106 | BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; | |
107 | spin_unlock(&em_tree->lock); | |
5f39d397 | 108 | goto out; |
a061fc8d CM |
109 | } |
110 | spin_unlock(&em_tree->lock); | |
7b13b7b1 | 111 | |
5f39d397 CM |
112 | em = alloc_extent_map(GFP_NOFS); |
113 | if (!em) { | |
114 | em = ERR_PTR(-ENOMEM); | |
115 | goto out; | |
116 | } | |
117 | em->start = 0; | |
0afbaf8c | 118 | em->len = (u64)-1; |
c8b97818 | 119 | em->block_len = (u64)-1; |
5f39d397 | 120 | em->block_start = 0; |
a061fc8d | 121 | em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; |
d1310b2e CM |
122 | |
123 | spin_lock(&em_tree->lock); | |
5f39d397 CM |
124 | ret = add_extent_mapping(em_tree, em); |
125 | if (ret == -EEXIST) { | |
0afbaf8c CM |
126 | u64 failed_start = em->start; |
127 | u64 failed_len = em->len; | |
128 | ||
129 | printk("failed to insert %Lu %Lu -> %Lu into tree\n", | |
130 | em->start, em->len, em->block_start); | |
5f39d397 | 131 | free_extent_map(em); |
7b13b7b1 | 132 | em = lookup_extent_mapping(em_tree, start, len); |
0afbaf8c CM |
133 | if (em) { |
134 | printk("after failing, found %Lu %Lu %Lu\n", | |
135 | em->start, em->len, em->block_start); | |
7b13b7b1 | 136 | ret = 0; |
0afbaf8c CM |
137 | } else { |
138 | em = lookup_extent_mapping(em_tree, failed_start, | |
139 | failed_len); | |
140 | if (em) { | |
141 | printk("double failure lookup gives us " | |
142 | "%Lu %Lu -> %Lu\n", em->start, | |
143 | em->len, em->block_start); | |
144 | free_extent_map(em); | |
145 | } | |
7b13b7b1 | 146 | ret = -EIO; |
0afbaf8c | 147 | } |
5f39d397 | 148 | } else if (ret) { |
7b13b7b1 CM |
149 | free_extent_map(em); |
150 | em = NULL; | |
5f39d397 | 151 | } |
7b13b7b1 CM |
152 | spin_unlock(&em_tree->lock); |
153 | ||
154 | if (ret) | |
155 | em = ERR_PTR(ret); | |
5f39d397 CM |
156 | out: |
157 | return em; | |
7eccb903 CM |
158 | } |
159 | ||
19c00ddc CM |
160 | u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len) |
161 | { | |
a5eb62e3 | 162 | return btrfs_crc32c(seed, data, len); |
19c00ddc CM |
163 | } |
164 | ||
165 | void btrfs_csum_final(u32 crc, char *result) | |
166 | { | |
167 | *(__le32 *)result = ~cpu_to_le32(crc); | |
168 | } | |
169 | ||
d352ac68 CM |
170 | /* |
171 | * compute the csum for a btree block, and either verify it or write it | |
172 | * into the csum field of the block. | |
173 | */ | |
19c00ddc CM |
174 | static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf, |
175 | int verify) | |
176 | { | |
177 | char result[BTRFS_CRC32_SIZE]; | |
178 | unsigned long len; | |
179 | unsigned long cur_len; | |
180 | unsigned long offset = BTRFS_CSUM_SIZE; | |
181 | char *map_token = NULL; | |
182 | char *kaddr; | |
183 | unsigned long map_start; | |
184 | unsigned long map_len; | |
185 | int err; | |
186 | u32 crc = ~(u32)0; | |
187 | ||
188 | len = buf->len - offset; | |
189 | while(len > 0) { | |
190 | err = map_private_extent_buffer(buf, offset, 32, | |
191 | &map_token, &kaddr, | |
192 | &map_start, &map_len, KM_USER0); | |
193 | if (err) { | |
194 | printk("failed to map extent buffer! %lu\n", | |
195 | offset); | |
196 | return 1; | |
197 | } | |
198 | cur_len = min(len, map_len - (offset - map_start)); | |
199 | crc = btrfs_csum_data(root, kaddr + offset - map_start, | |
200 | crc, cur_len); | |
201 | len -= cur_len; | |
202 | offset += cur_len; | |
203 | unmap_extent_buffer(buf, map_token, KM_USER0); | |
204 | } | |
205 | btrfs_csum_final(crc, result); | |
206 | ||
207 | if (verify) { | |
e4204ded | 208 | /* FIXME, this is not good */ |
63b10fc4 | 209 | if (memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) { |
e4204ded CM |
210 | u32 val; |
211 | u32 found = 0; | |
212 | memcpy(&found, result, BTRFS_CRC32_SIZE); | |
213 | ||
214 | read_extent_buffer(buf, &val, 0, BTRFS_CRC32_SIZE); | |
215 | printk("btrfs: %s checksum verify failed on %llu " | |
2dd3e67b | 216 | "wanted %X found %X level %d\n", |
19c00ddc | 217 | root->fs_info->sb->s_id, |
2dd3e67b | 218 | buf->start, val, found, btrfs_header_level(buf)); |
19c00ddc CM |
219 | return 1; |
220 | } | |
221 | } else { | |
222 | write_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE); | |
223 | } | |
224 | return 0; | |
225 | } | |
226 | ||
d352ac68 CM |
227 | /* |
228 | * we can't consider a given block up to date unless the transid of the | |
229 | * block matches the transid in the parent node's pointer. This is how we | |
230 | * detect blocks that either didn't get written at all or got written | |
231 | * in the wrong place. | |
232 | */ | |
1259ab75 CM |
233 | static int verify_parent_transid(struct extent_io_tree *io_tree, |
234 | struct extent_buffer *eb, u64 parent_transid) | |
235 | { | |
236 | int ret; | |
237 | ||
238 | if (!parent_transid || btrfs_header_generation(eb) == parent_transid) | |
239 | return 0; | |
240 | ||
241 | lock_extent(io_tree, eb->start, eb->start + eb->len - 1, GFP_NOFS); | |
242 | if (extent_buffer_uptodate(io_tree, eb) && | |
243 | btrfs_header_generation(eb) == parent_transid) { | |
244 | ret = 0; | |
245 | goto out; | |
246 | } | |
247 | printk("parent transid verify failed on %llu wanted %llu found %llu\n", | |
248 | (unsigned long long)eb->start, | |
249 | (unsigned long long)parent_transid, | |
250 | (unsigned long long)btrfs_header_generation(eb)); | |
251 | ret = 1; | |
1259ab75 | 252 | clear_extent_buffer_uptodate(io_tree, eb); |
33958dc6 | 253 | out: |
1259ab75 CM |
254 | unlock_extent(io_tree, eb->start, eb->start + eb->len - 1, |
255 | GFP_NOFS); | |
256 | return ret; | |
1259ab75 CM |
257 | } |
258 | ||
d352ac68 CM |
259 | /* |
260 | * helper to read a given tree block, doing retries as required when | |
261 | * the checksums don't match and we have alternate mirrors to try. | |
262 | */ | |
f188591e CM |
263 | static int btree_read_extent_buffer_pages(struct btrfs_root *root, |
264 | struct extent_buffer *eb, | |
ca7a79ad | 265 | u64 start, u64 parent_transid) |
f188591e CM |
266 | { |
267 | struct extent_io_tree *io_tree; | |
268 | int ret; | |
269 | int num_copies = 0; | |
270 | int mirror_num = 0; | |
271 | ||
272 | io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; | |
273 | while (1) { | |
274 | ret = read_extent_buffer_pages(io_tree, eb, start, 1, | |
275 | btree_get_extent, mirror_num); | |
1259ab75 CM |
276 | if (!ret && |
277 | !verify_parent_transid(io_tree, eb, parent_transid)) | |
f188591e | 278 | return ret; |
a1b32a59 | 279 | printk("read extent buffer pages failed with ret %d mirror no %d\n", ret, mirror_num); |
f188591e CM |
280 | num_copies = btrfs_num_copies(&root->fs_info->mapping_tree, |
281 | eb->start, eb->len); | |
4235298e | 282 | if (num_copies == 1) |
f188591e | 283 | return ret; |
4235298e | 284 | |
f188591e | 285 | mirror_num++; |
4235298e | 286 | if (mirror_num > num_copies) |
f188591e | 287 | return ret; |
f188591e | 288 | } |
f188591e CM |
289 | return -EIO; |
290 | } | |
19c00ddc | 291 | |
d352ac68 CM |
292 | /* |
293 | * checksum a dirty tree block before IO. This has extra checks to make | |
294 | * sure we only fill in the checksum field in the first page of a multi-page block | |
295 | */ | |
19c00ddc CM |
296 | int csum_dirty_buffer(struct btrfs_root *root, struct page *page) |
297 | { | |
d1310b2e | 298 | struct extent_io_tree *tree; |
35ebb934 | 299 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; |
19c00ddc CM |
300 | u64 found_start; |
301 | int found_level; | |
302 | unsigned long len; | |
303 | struct extent_buffer *eb; | |
f188591e CM |
304 | int ret; |
305 | ||
d1310b2e | 306 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
19c00ddc CM |
307 | |
308 | if (page->private == EXTENT_PAGE_PRIVATE) | |
309 | goto out; | |
310 | if (!page->private) | |
311 | goto out; | |
312 | len = page->private >> 2; | |
313 | if (len == 0) { | |
314 | WARN_ON(1); | |
315 | } | |
316 | eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); | |
ca7a79ad CM |
317 | ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE, |
318 | btrfs_header_generation(eb)); | |
f188591e | 319 | BUG_ON(ret); |
19c00ddc CM |
320 | found_start = btrfs_header_bytenr(eb); |
321 | if (found_start != start) { | |
322 | printk("warning: eb start incorrect %Lu buffer %Lu len %lu\n", | |
323 | start, found_start, len); | |
55c69072 CM |
324 | WARN_ON(1); |
325 | goto err; | |
326 | } | |
327 | if (eb->first_page != page) { | |
328 | printk("bad first page %lu %lu\n", eb->first_page->index, | |
329 | page->index); | |
330 | WARN_ON(1); | |
331 | goto err; | |
332 | } | |
333 | if (!PageUptodate(page)) { | |
334 | printk("csum not up to date page %lu\n", page->index); | |
335 | WARN_ON(1); | |
336 | goto err; | |
19c00ddc CM |
337 | } |
338 | found_level = btrfs_header_level(eb); | |
4bef0848 | 339 | |
19c00ddc | 340 | csum_tree_block(root, eb, 0); |
55c69072 | 341 | err: |
19c00ddc CM |
342 | free_extent_buffer(eb); |
343 | out: | |
344 | return 0; | |
345 | } | |
346 | ||
ce9adaa5 CM |
347 | int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
348 | struct extent_state *state) | |
349 | { | |
350 | struct extent_io_tree *tree; | |
351 | u64 found_start; | |
352 | int found_level; | |
353 | unsigned long len; | |
354 | struct extent_buffer *eb; | |
355 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
f188591e | 356 | int ret = 0; |
ce9adaa5 CM |
357 | |
358 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
359 | if (page->private == EXTENT_PAGE_PRIVATE) | |
360 | goto out; | |
361 | if (!page->private) | |
362 | goto out; | |
363 | len = page->private >> 2; | |
364 | if (len == 0) { | |
365 | WARN_ON(1); | |
366 | } | |
367 | eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); | |
f188591e | 368 | |
ce9adaa5 | 369 | found_start = btrfs_header_bytenr(eb); |
23a07867 | 370 | if (found_start != start) { |
a1b32a59 CM |
371 | printk("bad tree block start %llu %llu\n", |
372 | (unsigned long long)found_start, | |
373 | (unsigned long long)eb->start); | |
f188591e | 374 | ret = -EIO; |
ce9adaa5 CM |
375 | goto err; |
376 | } | |
377 | if (eb->first_page != page) { | |
378 | printk("bad first page %lu %lu\n", eb->first_page->index, | |
379 | page->index); | |
380 | WARN_ON(1); | |
f188591e | 381 | ret = -EIO; |
ce9adaa5 CM |
382 | goto err; |
383 | } | |
1259ab75 CM |
384 | if (memcmp_extent_buffer(eb, root->fs_info->fsid, |
385 | (unsigned long)btrfs_header_fsid(eb), | |
386 | BTRFS_FSID_SIZE)) { | |
387 | printk("bad fsid on block %Lu\n", eb->start); | |
388 | ret = -EIO; | |
389 | goto err; | |
390 | } | |
ce9adaa5 CM |
391 | found_level = btrfs_header_level(eb); |
392 | ||
393 | ret = csum_tree_block(root, eb, 1); | |
f188591e CM |
394 | if (ret) |
395 | ret = -EIO; | |
ce9adaa5 CM |
396 | |
397 | end = min_t(u64, eb->len, PAGE_CACHE_SIZE); | |
398 | end = eb->start + end - 1; | |
ce9adaa5 CM |
399 | err: |
400 | free_extent_buffer(eb); | |
401 | out: | |
f188591e | 402 | return ret; |
ce9adaa5 CM |
403 | } |
404 | ||
ce9adaa5 | 405 | static void end_workqueue_bio(struct bio *bio, int err) |
ce9adaa5 CM |
406 | { |
407 | struct end_io_wq *end_io_wq = bio->bi_private; | |
408 | struct btrfs_fs_info *fs_info; | |
ce9adaa5 | 409 | |
ce9adaa5 | 410 | fs_info = end_io_wq->info; |
ce9adaa5 | 411 | end_io_wq->error = err; |
8b712842 CM |
412 | end_io_wq->work.func = end_workqueue_fn; |
413 | end_io_wq->work.flags = 0; | |
e6dcd2dc CM |
414 | if (bio->bi_rw & (1 << BIO_RW)) |
415 | btrfs_queue_worker(&fs_info->endio_write_workers, | |
416 | &end_io_wq->work); | |
417 | else | |
418 | btrfs_queue_worker(&fs_info->endio_workers, &end_io_wq->work); | |
ce9adaa5 CM |
419 | } |
420 | ||
22c59948 CM |
421 | int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, |
422 | int metadata) | |
0b86a832 | 423 | { |
ce9adaa5 | 424 | struct end_io_wq *end_io_wq; |
ce9adaa5 CM |
425 | end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS); |
426 | if (!end_io_wq) | |
427 | return -ENOMEM; | |
428 | ||
429 | end_io_wq->private = bio->bi_private; | |
430 | end_io_wq->end_io = bio->bi_end_io; | |
22c59948 | 431 | end_io_wq->info = info; |
ce9adaa5 CM |
432 | end_io_wq->error = 0; |
433 | end_io_wq->bio = bio; | |
22c59948 | 434 | end_io_wq->metadata = metadata; |
ce9adaa5 CM |
435 | |
436 | bio->bi_private = end_io_wq; | |
437 | bio->bi_end_io = end_workqueue_bio; | |
22c59948 CM |
438 | return 0; |
439 | } | |
440 | ||
b64a2851 | 441 | unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info) |
0986fe9e | 442 | { |
4854ddd0 CM |
443 | unsigned long limit = min_t(unsigned long, |
444 | info->workers.max_workers, | |
445 | info->fs_devices->open_devices); | |
446 | return 256 * limit; | |
447 | } | |
0986fe9e | 448 | |
4854ddd0 CM |
449 | int btrfs_congested_async(struct btrfs_fs_info *info, int iodone) |
450 | { | |
b64a2851 CM |
451 | return atomic_read(&info->nr_async_bios) > |
452 | btrfs_async_submit_limit(info); | |
0986fe9e CM |
453 | } |
454 | ||
8b712842 CM |
455 | static void run_one_async_submit(struct btrfs_work *work) |
456 | { | |
457 | struct btrfs_fs_info *fs_info; | |
458 | struct async_submit_bio *async; | |
4854ddd0 | 459 | int limit; |
8b712842 CM |
460 | |
461 | async = container_of(work, struct async_submit_bio, work); | |
462 | fs_info = BTRFS_I(async->inode)->root->fs_info; | |
4854ddd0 | 463 | |
b64a2851 | 464 | limit = btrfs_async_submit_limit(fs_info); |
4854ddd0 CM |
465 | limit = limit * 2 / 3; |
466 | ||
8b712842 | 467 | atomic_dec(&fs_info->nr_async_submits); |
0986fe9e | 468 | |
b64a2851 CM |
469 | if (atomic_read(&fs_info->nr_async_submits) < limit && |
470 | waitqueue_active(&fs_info->async_submit_wait)) | |
4854ddd0 CM |
471 | wake_up(&fs_info->async_submit_wait); |
472 | ||
8b712842 | 473 | async->submit_bio_hook(async->inode, async->rw, async->bio, |
c8b97818 | 474 | async->mirror_num, async->bio_flags); |
8b712842 CM |
475 | kfree(async); |
476 | } | |
477 | ||
44b8bd7e CM |
478 | int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode, |
479 | int rw, struct bio *bio, int mirror_num, | |
c8b97818 | 480 | unsigned long bio_flags, |
44b8bd7e CM |
481 | extent_submit_bio_hook_t *submit_bio_hook) |
482 | { | |
483 | struct async_submit_bio *async; | |
b64a2851 | 484 | int limit = btrfs_async_submit_limit(fs_info); |
44b8bd7e CM |
485 | |
486 | async = kmalloc(sizeof(*async), GFP_NOFS); | |
487 | if (!async) | |
488 | return -ENOMEM; | |
489 | ||
490 | async->inode = inode; | |
491 | async->rw = rw; | |
492 | async->bio = bio; | |
493 | async->mirror_num = mirror_num; | |
494 | async->submit_bio_hook = submit_bio_hook; | |
8b712842 CM |
495 | async->work.func = run_one_async_submit; |
496 | async->work.flags = 0; | |
c8b97818 | 497 | async->bio_flags = bio_flags; |
8c8bee1d CM |
498 | |
499 | while(atomic_read(&fs_info->async_submit_draining) && | |
500 | atomic_read(&fs_info->nr_async_submits)) { | |
501 | wait_event(fs_info->async_submit_wait, | |
502 | (atomic_read(&fs_info->nr_async_submits) == 0)); | |
503 | } | |
504 | ||
cb03c743 | 505 | atomic_inc(&fs_info->nr_async_submits); |
8b712842 | 506 | btrfs_queue_worker(&fs_info->workers, &async->work); |
4854ddd0 | 507 | |
9473f16c CM |
508 | if (atomic_read(&fs_info->nr_async_submits) > limit) { |
509 | wait_event_timeout(fs_info->async_submit_wait, | |
4854ddd0 CM |
510 | (atomic_read(&fs_info->nr_async_submits) < limit), |
511 | HZ/10); | |
9473f16c CM |
512 | |
513 | wait_event_timeout(fs_info->async_submit_wait, | |
514 | (atomic_read(&fs_info->nr_async_bios) < limit), | |
515 | HZ/10); | |
516 | } | |
44b8bd7e CM |
517 | return 0; |
518 | } | |
519 | ||
ce3ed71a CM |
520 | static int btree_csum_one_bio(struct bio *bio) |
521 | { | |
522 | struct bio_vec *bvec = bio->bi_io_vec; | |
523 | int bio_index = 0; | |
524 | struct btrfs_root *root; | |
525 | ||
526 | WARN_ON(bio->bi_vcnt <= 0); | |
527 | while(bio_index < bio->bi_vcnt) { | |
528 | root = BTRFS_I(bvec->bv_page->mapping->host)->root; | |
529 | csum_dirty_buffer(root, bvec->bv_page); | |
530 | bio_index++; | |
531 | bvec++; | |
532 | } | |
533 | return 0; | |
534 | } | |
535 | ||
44b8bd7e | 536 | static int __btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
c8b97818 | 537 | int mirror_num, unsigned long bio_flags) |
22c59948 CM |
538 | { |
539 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
22c59948 CM |
540 | int ret; |
541 | ||
8b712842 CM |
542 | /* |
543 | * when we're called for a write, we're already in the async | |
5443be45 | 544 | * submission context. Just jump into btrfs_map_bio |
8b712842 | 545 | */ |
22c59948 | 546 | if (rw & (1 << BIO_RW)) { |
ce3ed71a | 547 | btree_csum_one_bio(bio); |
8b712842 | 548 | return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, |
5443be45 | 549 | mirror_num, 1); |
22c59948 CM |
550 | } |
551 | ||
8b712842 CM |
552 | /* |
553 | * called for a read, do the setup so that checksum validation | |
554 | * can happen in the async kernel threads | |
555 | */ | |
22c59948 CM |
556 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, 1); |
557 | BUG_ON(ret); | |
ce9adaa5 | 558 | |
8b712842 | 559 | return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1); |
0b86a832 CM |
560 | } |
561 | ||
44b8bd7e | 562 | static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
c8b97818 | 563 | int mirror_num, unsigned long bio_flags) |
44b8bd7e | 564 | { |
8b712842 CM |
565 | /* |
566 | * kthread helpers are used to submit writes so that checksumming | |
567 | * can happen in parallel across all CPUs | |
568 | */ | |
44b8bd7e | 569 | if (!(rw & (1 << BIO_RW))) { |
c8b97818 | 570 | return __btree_submit_bio_hook(inode, rw, bio, mirror_num, 0); |
44b8bd7e CM |
571 | } |
572 | return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, | |
c8b97818 | 573 | inode, rw, bio, mirror_num, 0, |
44b8bd7e CM |
574 | __btree_submit_bio_hook); |
575 | } | |
576 | ||
0da5468f CM |
577 | static int btree_writepage(struct page *page, struct writeback_control *wbc) |
578 | { | |
d1310b2e CM |
579 | struct extent_io_tree *tree; |
580 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
5443be45 CM |
581 | |
582 | if (current->flags & PF_MEMALLOC) { | |
583 | redirty_page_for_writepage(wbc, page); | |
584 | unlock_page(page); | |
585 | return 0; | |
586 | } | |
5f39d397 CM |
587 | return extent_write_full_page(tree, page, btree_get_extent, wbc); |
588 | } | |
0da5468f CM |
589 | |
590 | static int btree_writepages(struct address_space *mapping, | |
591 | struct writeback_control *wbc) | |
592 | { | |
d1310b2e CM |
593 | struct extent_io_tree *tree; |
594 | tree = &BTRFS_I(mapping->host)->io_tree; | |
d8d5f3e1 | 595 | if (wbc->sync_mode == WB_SYNC_NONE) { |
793955bc CM |
596 | u64 num_dirty; |
597 | u64 start = 0; | |
24ab9cd8 | 598 | unsigned long thresh = 32 * 1024 * 1024; |
448d640b CM |
599 | |
600 | if (wbc->for_kupdate) | |
601 | return 0; | |
602 | ||
1832a6d5 CM |
603 | num_dirty = count_range_bits(tree, &start, (u64)-1, |
604 | thresh, EXTENT_DIRTY); | |
793955bc CM |
605 | if (num_dirty < thresh) { |
606 | return 0; | |
607 | } | |
608 | } | |
0da5468f CM |
609 | return extent_writepages(tree, mapping, btree_get_extent, wbc); |
610 | } | |
611 | ||
5f39d397 CM |
612 | int btree_readpage(struct file *file, struct page *page) |
613 | { | |
d1310b2e CM |
614 | struct extent_io_tree *tree; |
615 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
5f39d397 CM |
616 | return extent_read_full_page(tree, page, btree_get_extent); |
617 | } | |
22b0ebda | 618 | |
70dec807 | 619 | static int btree_releasepage(struct page *page, gfp_t gfp_flags) |
5f39d397 | 620 | { |
d1310b2e CM |
621 | struct extent_io_tree *tree; |
622 | struct extent_map_tree *map; | |
5f39d397 | 623 | int ret; |
d98237b3 | 624 | |
98509cfc CM |
625 | if (PageWriteback(page) || PageDirty(page)) |
626 | return 0; | |
627 | ||
d1310b2e CM |
628 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
629 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
6af118ce | 630 | |
7b13b7b1 | 631 | ret = try_release_extent_state(map, tree, page, gfp_flags); |
6af118ce CM |
632 | if (!ret) { |
633 | return 0; | |
634 | } | |
635 | ||
636 | ret = try_release_extent_buffer(tree, page); | |
5f39d397 CM |
637 | if (ret == 1) { |
638 | ClearPagePrivate(page); | |
639 | set_page_private(page, 0); | |
640 | page_cache_release(page); | |
641 | } | |
6af118ce | 642 | |
d98237b3 CM |
643 | return ret; |
644 | } | |
645 | ||
5f39d397 | 646 | static void btree_invalidatepage(struct page *page, unsigned long offset) |
d98237b3 | 647 | { |
d1310b2e CM |
648 | struct extent_io_tree *tree; |
649 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
5f39d397 CM |
650 | extent_invalidatepage(tree, page, offset); |
651 | btree_releasepage(page, GFP_NOFS); | |
9ad6b7bc | 652 | if (PagePrivate(page)) { |
6af118ce CM |
653 | printk("warning page private not zero on page %Lu\n", |
654 | page_offset(page)); | |
9ad6b7bc CM |
655 | ClearPagePrivate(page); |
656 | set_page_private(page, 0); | |
657 | page_cache_release(page); | |
658 | } | |
d98237b3 CM |
659 | } |
660 | ||
5f39d397 | 661 | #if 0 |
d98237b3 | 662 | static int btree_writepage(struct page *page, struct writeback_control *wbc) |
ed2ff2cb | 663 | { |
87cbda5c | 664 | struct buffer_head *bh; |
0f7d52f4 | 665 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; |
87cbda5c | 666 | struct buffer_head *head; |
87cbda5c CM |
667 | if (!page_has_buffers(page)) { |
668 | create_empty_buffers(page, root->fs_info->sb->s_blocksize, | |
669 | (1 << BH_Dirty)|(1 << BH_Uptodate)); | |
670 | } | |
671 | head = page_buffers(page); | |
672 | bh = head; | |
673 | do { | |
674 | if (buffer_dirty(bh)) | |
675 | csum_tree_block(root, bh, 0); | |
676 | bh = bh->b_this_page; | |
677 | } while (bh != head); | |
d98237b3 | 678 | return block_write_full_page(page, btree_get_block, wbc); |
ed2ff2cb | 679 | } |
5f39d397 | 680 | #endif |
eb60ceac | 681 | |
d98237b3 CM |
682 | static struct address_space_operations btree_aops = { |
683 | .readpage = btree_readpage, | |
684 | .writepage = btree_writepage, | |
0da5468f | 685 | .writepages = btree_writepages, |
5f39d397 CM |
686 | .releasepage = btree_releasepage, |
687 | .invalidatepage = btree_invalidatepage, | |
d98237b3 CM |
688 | .sync_page = block_sync_page, |
689 | }; | |
690 | ||
ca7a79ad CM |
691 | int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize, |
692 | u64 parent_transid) | |
090d1875 | 693 | { |
5f39d397 CM |
694 | struct extent_buffer *buf = NULL; |
695 | struct inode *btree_inode = root->fs_info->btree_inode; | |
de428b63 | 696 | int ret = 0; |
090d1875 | 697 | |
db94535d | 698 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); |
5f39d397 | 699 | if (!buf) |
090d1875 | 700 | return 0; |
d1310b2e | 701 | read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, |
f188591e | 702 | buf, 0, 0, btree_get_extent, 0); |
5f39d397 | 703 | free_extent_buffer(buf); |
de428b63 | 704 | return ret; |
090d1875 CM |
705 | } |
706 | ||
0999df54 CM |
707 | struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root, |
708 | u64 bytenr, u32 blocksize) | |
709 | { | |
710 | struct inode *btree_inode = root->fs_info->btree_inode; | |
711 | struct extent_buffer *eb; | |
712 | eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree, | |
713 | bytenr, blocksize, GFP_NOFS); | |
714 | return eb; | |
715 | } | |
716 | ||
717 | struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root, | |
718 | u64 bytenr, u32 blocksize) | |
719 | { | |
720 | struct inode *btree_inode = root->fs_info->btree_inode; | |
721 | struct extent_buffer *eb; | |
722 | ||
723 | eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree, | |
724 | bytenr, blocksize, NULL, GFP_NOFS); | |
725 | return eb; | |
726 | } | |
727 | ||
728 | ||
e02119d5 CM |
729 | int btrfs_write_tree_block(struct extent_buffer *buf) |
730 | { | |
731 | return btrfs_fdatawrite_range(buf->first_page->mapping, buf->start, | |
24ab9cd8 | 732 | buf->start + buf->len - 1, WB_SYNC_ALL); |
e02119d5 CM |
733 | } |
734 | ||
735 | int btrfs_wait_tree_block_writeback(struct extent_buffer *buf) | |
736 | { | |
737 | return btrfs_wait_on_page_writeback_range(buf->first_page->mapping, | |
738 | buf->start, buf->start + buf->len -1); | |
739 | } | |
740 | ||
0999df54 | 741 | struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr, |
ca7a79ad | 742 | u32 blocksize, u64 parent_transid) |
0999df54 CM |
743 | { |
744 | struct extent_buffer *buf = NULL; | |
745 | struct inode *btree_inode = root->fs_info->btree_inode; | |
746 | struct extent_io_tree *io_tree; | |
747 | int ret; | |
748 | ||
749 | io_tree = &BTRFS_I(btree_inode)->io_tree; | |
750 | ||
751 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
752 | if (!buf) | |
753 | return NULL; | |
0999df54 | 754 | |
ca7a79ad | 755 | ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); |
ce9adaa5 CM |
756 | |
757 | if (ret == 0) { | |
758 | buf->flags |= EXTENT_UPTODATE; | |
a1b32a59 CM |
759 | } else { |
760 | WARN_ON(1); | |
ce9adaa5 | 761 | } |
5f39d397 | 762 | return buf; |
ce9adaa5 | 763 | |
eb60ceac CM |
764 | } |
765 | ||
e089f05c | 766 | int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
5f39d397 | 767 | struct extent_buffer *buf) |
ed2ff2cb | 768 | { |
5f39d397 | 769 | struct inode *btree_inode = root->fs_info->btree_inode; |
55c69072 | 770 | if (btrfs_header_generation(buf) == |
925baedd CM |
771 | root->fs_info->running_transaction->transid) { |
772 | WARN_ON(!btrfs_tree_locked(buf)); | |
d1310b2e | 773 | clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, |
55c69072 | 774 | buf); |
925baedd | 775 | } |
5f39d397 CM |
776 | return 0; |
777 | } | |
778 | ||
db94535d | 779 | static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, |
87ee04eb | 780 | u32 stripesize, struct btrfs_root *root, |
9f5fae2f | 781 | struct btrfs_fs_info *fs_info, |
e20d96d6 | 782 | u64 objectid) |
d97e63b6 | 783 | { |
cfaa7295 | 784 | root->node = NULL; |
0f7d52f4 | 785 | root->inode = NULL; |
a28ec197 | 786 | root->commit_root = NULL; |
31153d81 | 787 | root->ref_tree = NULL; |
db94535d CM |
788 | root->sectorsize = sectorsize; |
789 | root->nodesize = nodesize; | |
790 | root->leafsize = leafsize; | |
87ee04eb | 791 | root->stripesize = stripesize; |
123abc88 | 792 | root->ref_cows = 0; |
0b86a832 CM |
793 | root->track_dirty = 0; |
794 | ||
9f5fae2f | 795 | root->fs_info = fs_info; |
0f7d52f4 CM |
796 | root->objectid = objectid; |
797 | root->last_trans = 0; | |
1b05da2e CM |
798 | root->highest_inode = 0; |
799 | root->last_inode_alloc = 0; | |
58176a96 | 800 | root->name = NULL; |
4313b399 | 801 | root->in_sysfs = 0; |
0b86a832 CM |
802 | |
803 | INIT_LIST_HEAD(&root->dirty_list); | |
7b128766 | 804 | INIT_LIST_HEAD(&root->orphan_list); |
bcc63abb | 805 | INIT_LIST_HEAD(&root->dead_list); |
925baedd | 806 | spin_lock_init(&root->node_lock); |
bcc63abb | 807 | spin_lock_init(&root->list_lock); |
a2135011 | 808 | mutex_init(&root->objectid_mutex); |
e02119d5 | 809 | mutex_init(&root->log_mutex); |
d0c803c4 CM |
810 | extent_io_tree_init(&root->dirty_log_pages, |
811 | fs_info->btree_inode->i_mapping, GFP_NOFS); | |
017e5369 CM |
812 | |
813 | btrfs_leaf_ref_tree_init(&root->ref_tree_struct); | |
814 | root->ref_tree = &root->ref_tree_struct; | |
815 | ||
3768f368 CM |
816 | memset(&root->root_key, 0, sizeof(root->root_key)); |
817 | memset(&root->root_item, 0, sizeof(root->root_item)); | |
6702ed49 | 818 | memset(&root->defrag_progress, 0, sizeof(root->defrag_progress)); |
58176a96 | 819 | memset(&root->root_kobj, 0, sizeof(root->root_kobj)); |
3f157a2f | 820 | root->defrag_trans_start = fs_info->generation; |
58176a96 | 821 | init_completion(&root->kobj_unregister); |
6702ed49 CM |
822 | root->defrag_running = 0; |
823 | root->defrag_level = 0; | |
4d775673 | 824 | root->root_key.objectid = objectid; |
3768f368 CM |
825 | return 0; |
826 | } | |
827 | ||
db94535d | 828 | static int find_and_setup_root(struct btrfs_root *tree_root, |
9f5fae2f CM |
829 | struct btrfs_fs_info *fs_info, |
830 | u64 objectid, | |
e20d96d6 | 831 | struct btrfs_root *root) |
3768f368 CM |
832 | { |
833 | int ret; | |
db94535d | 834 | u32 blocksize; |
84234f3a | 835 | u64 generation; |
3768f368 | 836 | |
db94535d | 837 | __setup_root(tree_root->nodesize, tree_root->leafsize, |
87ee04eb CM |
838 | tree_root->sectorsize, tree_root->stripesize, |
839 | root, fs_info, objectid); | |
3768f368 CM |
840 | ret = btrfs_find_last_root(tree_root, objectid, |
841 | &root->root_item, &root->root_key); | |
842 | BUG_ON(ret); | |
843 | ||
84234f3a | 844 | generation = btrfs_root_generation(&root->root_item); |
db94535d CM |
845 | blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); |
846 | root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), | |
84234f3a | 847 | blocksize, generation); |
3768f368 | 848 | BUG_ON(!root->node); |
d97e63b6 CM |
849 | return 0; |
850 | } | |
851 | ||
e02119d5 CM |
852 | int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans, |
853 | struct btrfs_fs_info *fs_info) | |
854 | { | |
855 | struct extent_buffer *eb; | |
d0c803c4 CM |
856 | struct btrfs_root *log_root_tree = fs_info->log_root_tree; |
857 | u64 start = 0; | |
858 | u64 end = 0; | |
e02119d5 CM |
859 | int ret; |
860 | ||
d0c803c4 | 861 | if (!log_root_tree) |
e02119d5 CM |
862 | return 0; |
863 | ||
d0c803c4 CM |
864 | while(1) { |
865 | ret = find_first_extent_bit(&log_root_tree->dirty_log_pages, | |
866 | 0, &start, &end, EXTENT_DIRTY); | |
867 | if (ret) | |
868 | break; | |
869 | ||
870 | clear_extent_dirty(&log_root_tree->dirty_log_pages, | |
871 | start, end, GFP_NOFS); | |
872 | } | |
e02119d5 CM |
873 | eb = fs_info->log_root_tree->node; |
874 | ||
875 | WARN_ON(btrfs_header_level(eb) != 0); | |
876 | WARN_ON(btrfs_header_nritems(eb) != 0); | |
877 | ||
d00aff00 CM |
878 | ret = btrfs_free_reserved_extent(fs_info->tree_root, |
879 | eb->start, eb->len); | |
e02119d5 CM |
880 | BUG_ON(ret); |
881 | ||
882 | free_extent_buffer(eb); | |
883 | kfree(fs_info->log_root_tree); | |
884 | fs_info->log_root_tree = NULL; | |
885 | return 0; | |
886 | } | |
887 | ||
888 | int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, | |
889 | struct btrfs_fs_info *fs_info) | |
0f7d52f4 CM |
890 | { |
891 | struct btrfs_root *root; | |
892 | struct btrfs_root *tree_root = fs_info->tree_root; | |
e02119d5 CM |
893 | |
894 | root = kzalloc(sizeof(*root), GFP_NOFS); | |
895 | if (!root) | |
896 | return -ENOMEM; | |
897 | ||
898 | __setup_root(tree_root->nodesize, tree_root->leafsize, | |
899 | tree_root->sectorsize, tree_root->stripesize, | |
900 | root, fs_info, BTRFS_TREE_LOG_OBJECTID); | |
901 | ||
902 | root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID; | |
903 | root->root_key.type = BTRFS_ROOT_ITEM_KEY; | |
904 | root->root_key.offset = BTRFS_TREE_LOG_OBJECTID; | |
905 | root->ref_cows = 0; | |
906 | ||
907 | root->node = btrfs_alloc_free_block(trans, root, root->leafsize, | |
31840ae1 ZY |
908 | 0, BTRFS_TREE_LOG_OBJECTID, |
909 | trans->transid, 0, 0, 0); | |
e02119d5 CM |
910 | |
911 | btrfs_set_header_nritems(root->node, 0); | |
912 | btrfs_set_header_level(root->node, 0); | |
913 | btrfs_set_header_bytenr(root->node, root->node->start); | |
914 | btrfs_set_header_generation(root->node, trans->transid); | |
915 | btrfs_set_header_owner(root->node, BTRFS_TREE_LOG_OBJECTID); | |
916 | ||
917 | write_extent_buffer(root->node, root->fs_info->fsid, | |
918 | (unsigned long)btrfs_header_fsid(root->node), | |
919 | BTRFS_FSID_SIZE); | |
920 | btrfs_mark_buffer_dirty(root->node); | |
921 | btrfs_tree_unlock(root->node); | |
922 | fs_info->log_root_tree = root; | |
923 | return 0; | |
924 | } | |
925 | ||
926 | struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root, | |
927 | struct btrfs_key *location) | |
928 | { | |
929 | struct btrfs_root *root; | |
930 | struct btrfs_fs_info *fs_info = tree_root->fs_info; | |
0f7d52f4 | 931 | struct btrfs_path *path; |
5f39d397 | 932 | struct extent_buffer *l; |
1b05da2e | 933 | u64 highest_inode; |
84234f3a | 934 | u64 generation; |
db94535d | 935 | u32 blocksize; |
0f7d52f4 CM |
936 | int ret = 0; |
937 | ||
5eda7b5e | 938 | root = kzalloc(sizeof(*root), GFP_NOFS); |
0cf6c620 | 939 | if (!root) |
0f7d52f4 | 940 | return ERR_PTR(-ENOMEM); |
0f7d52f4 | 941 | if (location->offset == (u64)-1) { |
db94535d | 942 | ret = find_and_setup_root(tree_root, fs_info, |
0f7d52f4 CM |
943 | location->objectid, root); |
944 | if (ret) { | |
0f7d52f4 CM |
945 | kfree(root); |
946 | return ERR_PTR(ret); | |
947 | } | |
948 | goto insert; | |
949 | } | |
950 | ||
db94535d | 951 | __setup_root(tree_root->nodesize, tree_root->leafsize, |
87ee04eb CM |
952 | tree_root->sectorsize, tree_root->stripesize, |
953 | root, fs_info, location->objectid); | |
0f7d52f4 CM |
954 | |
955 | path = btrfs_alloc_path(); | |
956 | BUG_ON(!path); | |
957 | ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0); | |
958 | if (ret != 0) { | |
0f7d52f4 CM |
959 | if (ret > 0) |
960 | ret = -ENOENT; | |
961 | goto out; | |
962 | } | |
5f39d397 CM |
963 | l = path->nodes[0]; |
964 | read_extent_buffer(l, &root->root_item, | |
965 | btrfs_item_ptr_offset(l, path->slots[0]), | |
0f7d52f4 | 966 | sizeof(root->root_item)); |
44b36eb2 | 967 | memcpy(&root->root_key, location, sizeof(*location)); |
0f7d52f4 CM |
968 | ret = 0; |
969 | out: | |
970 | btrfs_release_path(root, path); | |
971 | btrfs_free_path(path); | |
972 | if (ret) { | |
973 | kfree(root); | |
974 | return ERR_PTR(ret); | |
975 | } | |
84234f3a | 976 | generation = btrfs_root_generation(&root->root_item); |
db94535d CM |
977 | blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); |
978 | root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), | |
84234f3a | 979 | blocksize, generation); |
0f7d52f4 CM |
980 | BUG_ON(!root->node); |
981 | insert: | |
e02119d5 CM |
982 | if (location->objectid != BTRFS_TREE_LOG_OBJECTID) { |
983 | root->ref_cows = 1; | |
984 | ret = btrfs_find_highest_inode(root, &highest_inode); | |
985 | if (ret == 0) { | |
986 | root->highest_inode = highest_inode; | |
987 | root->last_inode_alloc = highest_inode; | |
988 | } | |
5eda7b5e CM |
989 | } |
990 | return root; | |
991 | } | |
992 | ||
dc17ff8f CM |
993 | struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info, |
994 | u64 root_objectid) | |
995 | { | |
996 | struct btrfs_root *root; | |
997 | ||
998 | if (root_objectid == BTRFS_ROOT_TREE_OBJECTID) | |
999 | return fs_info->tree_root; | |
1000 | if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID) | |
1001 | return fs_info->extent_root; | |
1002 | ||
1003 | root = radix_tree_lookup(&fs_info->fs_roots_radix, | |
1004 | (unsigned long)root_objectid); | |
1005 | return root; | |
1006 | } | |
1007 | ||
edbd8d4e CM |
1008 | struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info, |
1009 | struct btrfs_key *location) | |
5eda7b5e CM |
1010 | { |
1011 | struct btrfs_root *root; | |
1012 | int ret; | |
1013 | ||
edbd8d4e CM |
1014 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) |
1015 | return fs_info->tree_root; | |
1016 | if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID) | |
1017 | return fs_info->extent_root; | |
8f18cf13 CM |
1018 | if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID) |
1019 | return fs_info->chunk_root; | |
1020 | if (location->objectid == BTRFS_DEV_TREE_OBJECTID) | |
1021 | return fs_info->dev_root; | |
edbd8d4e | 1022 | |
5eda7b5e CM |
1023 | root = radix_tree_lookup(&fs_info->fs_roots_radix, |
1024 | (unsigned long)location->objectid); | |
1025 | if (root) | |
1026 | return root; | |
1027 | ||
e02119d5 | 1028 | root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location); |
5eda7b5e CM |
1029 | if (IS_ERR(root)) |
1030 | return root; | |
2619ba1f CM |
1031 | ret = radix_tree_insert(&fs_info->fs_roots_radix, |
1032 | (unsigned long)root->root_key.objectid, | |
0f7d52f4 CM |
1033 | root); |
1034 | if (ret) { | |
5f39d397 | 1035 | free_extent_buffer(root->node); |
0f7d52f4 CM |
1036 | kfree(root); |
1037 | return ERR_PTR(ret); | |
1038 | } | |
edbd8d4e CM |
1039 | ret = btrfs_find_dead_roots(fs_info->tree_root, |
1040 | root->root_key.objectid, root); | |
1041 | BUG_ON(ret); | |
1042 | ||
1043 | return root; | |
1044 | } | |
1045 | ||
1046 | struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info, | |
1047 | struct btrfs_key *location, | |
1048 | const char *name, int namelen) | |
1049 | { | |
1050 | struct btrfs_root *root; | |
1051 | int ret; | |
1052 | ||
1053 | root = btrfs_read_fs_root_no_name(fs_info, location); | |
1054 | if (!root) | |
1055 | return NULL; | |
58176a96 | 1056 | |
4313b399 CM |
1057 | if (root->in_sysfs) |
1058 | return root; | |
1059 | ||
58176a96 JB |
1060 | ret = btrfs_set_root_name(root, name, namelen); |
1061 | if (ret) { | |
5f39d397 | 1062 | free_extent_buffer(root->node); |
58176a96 JB |
1063 | kfree(root); |
1064 | return ERR_PTR(ret); | |
1065 | } | |
1066 | ||
1067 | ret = btrfs_sysfs_add_root(root); | |
1068 | if (ret) { | |
5f39d397 | 1069 | free_extent_buffer(root->node); |
58176a96 JB |
1070 | kfree(root->name); |
1071 | kfree(root); | |
1072 | return ERR_PTR(ret); | |
1073 | } | |
4313b399 | 1074 | root->in_sysfs = 1; |
0f7d52f4 CM |
1075 | return root; |
1076 | } | |
19c00ddc CM |
1077 | #if 0 |
1078 | static int add_hasher(struct btrfs_fs_info *info, char *type) { | |
1079 | struct btrfs_hasher *hasher; | |
1080 | ||
1081 | hasher = kmalloc(sizeof(*hasher), GFP_NOFS); | |
1082 | if (!hasher) | |
1083 | return -ENOMEM; | |
1084 | hasher->hash_tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC); | |
1085 | if (!hasher->hash_tfm) { | |
1086 | kfree(hasher); | |
1087 | return -EINVAL; | |
1088 | } | |
1089 | spin_lock(&info->hash_lock); | |
1090 | list_add(&hasher->list, &info->hashers); | |
1091 | spin_unlock(&info->hash_lock); | |
1092 | return 0; | |
1093 | } | |
1094 | #endif | |
04160088 CM |
1095 | |
1096 | static int btrfs_congested_fn(void *congested_data, int bdi_bits) | |
1097 | { | |
1098 | struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data; | |
1099 | int ret = 0; | |
1100 | struct list_head *cur; | |
1101 | struct btrfs_device *device; | |
1102 | struct backing_dev_info *bdi; | |
1103 | ||
cb03c743 | 1104 | if ((bdi_bits & (1 << BDI_write_congested)) && |
777e6bd7 | 1105 | btrfs_congested_async(info, 0)) |
cb03c743 | 1106 | return 1; |
cb03c743 | 1107 | |
04160088 CM |
1108 | list_for_each(cur, &info->fs_devices->devices) { |
1109 | device = list_entry(cur, struct btrfs_device, dev_list); | |
dfe25020 CM |
1110 | if (!device->bdev) |
1111 | continue; | |
04160088 CM |
1112 | bdi = blk_get_backing_dev_info(device->bdev); |
1113 | if (bdi && bdi_congested(bdi, bdi_bits)) { | |
1114 | ret = 1; | |
1115 | break; | |
1116 | } | |
1117 | } | |
1118 | return ret; | |
1119 | } | |
1120 | ||
38b66988 CM |
1121 | /* |
1122 | * this unplugs every device on the box, and it is only used when page | |
1123 | * is null | |
1124 | */ | |
1125 | static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page) | |
1126 | { | |
1127 | struct list_head *cur; | |
1128 | struct btrfs_device *device; | |
1129 | struct btrfs_fs_info *info; | |
1130 | ||
1131 | info = (struct btrfs_fs_info *)bdi->unplug_io_data; | |
1132 | list_for_each(cur, &info->fs_devices->devices) { | |
1133 | device = list_entry(cur, struct btrfs_device, dev_list); | |
1134 | bdi = blk_get_backing_dev_info(device->bdev); | |
1135 | if (bdi->unplug_io_fn) { | |
1136 | bdi->unplug_io_fn(bdi, page); | |
1137 | } | |
1138 | } | |
1139 | } | |
1140 | ||
04160088 CM |
1141 | void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page) |
1142 | { | |
38b66988 | 1143 | struct inode *inode; |
f2d8d74d CM |
1144 | struct extent_map_tree *em_tree; |
1145 | struct extent_map *em; | |
bcbfce8a | 1146 | struct address_space *mapping; |
38b66988 CM |
1147 | u64 offset; |
1148 | ||
bcbfce8a | 1149 | /* the generic O_DIRECT read code does this */ |
38b66988 CM |
1150 | if (!page) { |
1151 | __unplug_io_fn(bdi, page); | |
1152 | return; | |
1153 | } | |
1154 | ||
bcbfce8a CM |
1155 | /* |
1156 | * page->mapping may change at any time. Get a consistent copy | |
1157 | * and use that for everything below | |
1158 | */ | |
1159 | smp_mb(); | |
1160 | mapping = page->mapping; | |
1161 | if (!mapping) | |
1162 | return; | |
1163 | ||
1164 | inode = mapping->host; | |
38b66988 | 1165 | offset = page_offset(page); |
04160088 | 1166 | |
f2d8d74d CM |
1167 | em_tree = &BTRFS_I(inode)->extent_tree; |
1168 | spin_lock(&em_tree->lock); | |
1169 | em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); | |
1170 | spin_unlock(&em_tree->lock); | |
89642229 CM |
1171 | if (!em) { |
1172 | __unplug_io_fn(bdi, page); | |
f2d8d74d | 1173 | return; |
89642229 | 1174 | } |
f2d8d74d | 1175 | |
89642229 CM |
1176 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { |
1177 | free_extent_map(em); | |
1178 | __unplug_io_fn(bdi, page); | |
1179 | return; | |
1180 | } | |
f2d8d74d CM |
1181 | offset = offset - em->start; |
1182 | btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree, | |
1183 | em->block_start + offset, page); | |
1184 | free_extent_map(em); | |
04160088 CM |
1185 | } |
1186 | ||
1187 | static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi) | |
1188 | { | |
1189 | bdi_init(bdi); | |
4575c9cc | 1190 | bdi->ra_pages = default_backing_dev_info.ra_pages; |
04160088 CM |
1191 | bdi->state = 0; |
1192 | bdi->capabilities = default_backing_dev_info.capabilities; | |
1193 | bdi->unplug_io_fn = btrfs_unplug_io_fn; | |
1194 | bdi->unplug_io_data = info; | |
1195 | bdi->congested_fn = btrfs_congested_fn; | |
1196 | bdi->congested_data = info; | |
1197 | return 0; | |
1198 | } | |
1199 | ||
ce9adaa5 CM |
1200 | static int bio_ready_for_csum(struct bio *bio) |
1201 | { | |
1202 | u64 length = 0; | |
1203 | u64 buf_len = 0; | |
1204 | u64 start = 0; | |
1205 | struct page *page; | |
1206 | struct extent_io_tree *io_tree = NULL; | |
1207 | struct btrfs_fs_info *info = NULL; | |
1208 | struct bio_vec *bvec; | |
1209 | int i; | |
1210 | int ret; | |
1211 | ||
1212 | bio_for_each_segment(bvec, bio, i) { | |
1213 | page = bvec->bv_page; | |
1214 | if (page->private == EXTENT_PAGE_PRIVATE) { | |
1215 | length += bvec->bv_len; | |
1216 | continue; | |
1217 | } | |
1218 | if (!page->private) { | |
1219 | length += bvec->bv_len; | |
1220 | continue; | |
1221 | } | |
1222 | length = bvec->bv_len; | |
1223 | buf_len = page->private >> 2; | |
1224 | start = page_offset(page) + bvec->bv_offset; | |
1225 | io_tree = &BTRFS_I(page->mapping->host)->io_tree; | |
1226 | info = BTRFS_I(page->mapping->host)->root->fs_info; | |
1227 | } | |
1228 | /* are we fully contained in this bio? */ | |
1229 | if (buf_len <= length) | |
1230 | return 1; | |
1231 | ||
1232 | ret = extent_range_uptodate(io_tree, start + length, | |
1233 | start + buf_len - 1); | |
1234 | if (ret == 1) | |
1235 | return ret; | |
1236 | return ret; | |
1237 | } | |
1238 | ||
8b712842 CM |
1239 | /* |
1240 | * called by the kthread helper functions to finally call the bio end_io | |
1241 | * functions. This is where read checksum verification actually happens | |
1242 | */ | |
1243 | static void end_workqueue_fn(struct btrfs_work *work) | |
ce9adaa5 | 1244 | { |
ce9adaa5 | 1245 | struct bio *bio; |
8b712842 CM |
1246 | struct end_io_wq *end_io_wq; |
1247 | struct btrfs_fs_info *fs_info; | |
ce9adaa5 | 1248 | int error; |
ce9adaa5 | 1249 | |
8b712842 CM |
1250 | end_io_wq = container_of(work, struct end_io_wq, work); |
1251 | bio = end_io_wq->bio; | |
1252 | fs_info = end_io_wq->info; | |
ce9adaa5 | 1253 | |
8b712842 CM |
1254 | /* metadata bios are special because the whole tree block must |
1255 | * be checksummed at once. This makes sure the entire block is in | |
1256 | * ram and up to date before trying to verify things. For | |
1257 | * blocksize <= pagesize, it is basically a noop | |
1258 | */ | |
1259 | if (end_io_wq->metadata && !bio_ready_for_csum(bio)) { | |
1260 | btrfs_queue_worker(&fs_info->endio_workers, | |
1261 | &end_io_wq->work); | |
1262 | return; | |
1263 | } | |
1264 | error = end_io_wq->error; | |
1265 | bio->bi_private = end_io_wq->private; | |
1266 | bio->bi_end_io = end_io_wq->end_io; | |
1267 | kfree(end_io_wq); | |
8b712842 | 1268 | bio_endio(bio, error); |
44b8bd7e CM |
1269 | } |
1270 | ||
a74a4b97 CM |
1271 | static int cleaner_kthread(void *arg) |
1272 | { | |
1273 | struct btrfs_root *root = arg; | |
1274 | ||
1275 | do { | |
1276 | smp_mb(); | |
1277 | if (root->fs_info->closing) | |
1278 | break; | |
1279 | ||
1280 | vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); | |
1281 | mutex_lock(&root->fs_info->cleaner_mutex); | |
a74a4b97 | 1282 | btrfs_clean_old_snapshots(root); |
a74a4b97 CM |
1283 | mutex_unlock(&root->fs_info->cleaner_mutex); |
1284 | ||
1285 | if (freezing(current)) { | |
1286 | refrigerator(); | |
1287 | } else { | |
1288 | smp_mb(); | |
1289 | if (root->fs_info->closing) | |
1290 | break; | |
1291 | set_current_state(TASK_INTERRUPTIBLE); | |
1292 | schedule(); | |
1293 | __set_current_state(TASK_RUNNING); | |
1294 | } | |
1295 | } while (!kthread_should_stop()); | |
1296 | return 0; | |
1297 | } | |
1298 | ||
1299 | static int transaction_kthread(void *arg) | |
1300 | { | |
1301 | struct btrfs_root *root = arg; | |
1302 | struct btrfs_trans_handle *trans; | |
1303 | struct btrfs_transaction *cur; | |
1304 | unsigned long now; | |
1305 | unsigned long delay; | |
1306 | int ret; | |
1307 | ||
1308 | do { | |
1309 | smp_mb(); | |
1310 | if (root->fs_info->closing) | |
1311 | break; | |
1312 | ||
1313 | delay = HZ * 30; | |
1314 | vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); | |
1315 | mutex_lock(&root->fs_info->transaction_kthread_mutex); | |
1316 | ||
ab78c84d CM |
1317 | if (root->fs_info->total_ref_cache_size > 20 * 1024 * 1024) { |
1318 | printk("btrfs: total reference cache size %Lu\n", | |
1319 | root->fs_info->total_ref_cache_size); | |
1320 | } | |
31153d81 | 1321 | |
a74a4b97 CM |
1322 | mutex_lock(&root->fs_info->trans_mutex); |
1323 | cur = root->fs_info->running_transaction; | |
1324 | if (!cur) { | |
1325 | mutex_unlock(&root->fs_info->trans_mutex); | |
1326 | goto sleep; | |
1327 | } | |
31153d81 | 1328 | |
a74a4b97 CM |
1329 | now = get_seconds(); |
1330 | if (now < cur->start_time || now - cur->start_time < 30) { | |
1331 | mutex_unlock(&root->fs_info->trans_mutex); | |
1332 | delay = HZ * 5; | |
1333 | goto sleep; | |
1334 | } | |
1335 | mutex_unlock(&root->fs_info->trans_mutex); | |
a74a4b97 CM |
1336 | trans = btrfs_start_transaction(root, 1); |
1337 | ret = btrfs_commit_transaction(trans, root); | |
1338 | sleep: | |
1339 | wake_up_process(root->fs_info->cleaner_kthread); | |
1340 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); | |
1341 | ||
1342 | if (freezing(current)) { | |
1343 | refrigerator(); | |
1344 | } else { | |
1345 | if (root->fs_info->closing) | |
1346 | break; | |
1347 | set_current_state(TASK_INTERRUPTIBLE); | |
1348 | schedule_timeout(delay); | |
1349 | __set_current_state(TASK_RUNNING); | |
1350 | } | |
1351 | } while (!kthread_should_stop()); | |
1352 | return 0; | |
1353 | } | |
1354 | ||
8a4b83cc | 1355 | struct btrfs_root *open_ctree(struct super_block *sb, |
dfe25020 CM |
1356 | struct btrfs_fs_devices *fs_devices, |
1357 | char *options) | |
2e635a27 | 1358 | { |
db94535d CM |
1359 | u32 sectorsize; |
1360 | u32 nodesize; | |
1361 | u32 leafsize; | |
1362 | u32 blocksize; | |
87ee04eb | 1363 | u32 stripesize; |
84234f3a | 1364 | u64 generation; |
a061fc8d | 1365 | struct buffer_head *bh; |
e02119d5 | 1366 | struct btrfs_root *extent_root = kzalloc(sizeof(struct btrfs_root), |
e20d96d6 | 1367 | GFP_NOFS); |
e02119d5 | 1368 | struct btrfs_root *tree_root = kzalloc(sizeof(struct btrfs_root), |
e20d96d6 | 1369 | GFP_NOFS); |
8790d502 | 1370 | struct btrfs_fs_info *fs_info = kzalloc(sizeof(*fs_info), |
e20d96d6 | 1371 | GFP_NOFS); |
e02119d5 | 1372 | struct btrfs_root *chunk_root = kzalloc(sizeof(struct btrfs_root), |
0b86a832 | 1373 | GFP_NOFS); |
e02119d5 | 1374 | struct btrfs_root *dev_root = kzalloc(sizeof(struct btrfs_root), |
0b86a832 | 1375 | GFP_NOFS); |
e02119d5 CM |
1376 | struct btrfs_root *log_tree_root; |
1377 | ||
eb60ceac | 1378 | int ret; |
e58ca020 | 1379 | int err = -EINVAL; |
4543df7e | 1380 | |
2c90e5d6 | 1381 | struct btrfs_super_block *disk_super; |
8790d502 | 1382 | |
0463bb4e JM |
1383 | if (!extent_root || !tree_root || !fs_info || |
1384 | !chunk_root || !dev_root) { | |
39279cc3 CM |
1385 | err = -ENOMEM; |
1386 | goto fail; | |
1387 | } | |
0f7d52f4 | 1388 | INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS); |
8fd17795 | 1389 | INIT_LIST_HEAD(&fs_info->trans_list); |
facda1e7 | 1390 | INIT_LIST_HEAD(&fs_info->dead_roots); |
19c00ddc | 1391 | INIT_LIST_HEAD(&fs_info->hashers); |
ea8c2819 | 1392 | INIT_LIST_HEAD(&fs_info->delalloc_inodes); |
19c00ddc | 1393 | spin_lock_init(&fs_info->hash_lock); |
1832a6d5 | 1394 | spin_lock_init(&fs_info->delalloc_lock); |
cee36a03 | 1395 | spin_lock_init(&fs_info->new_trans_lock); |
31153d81 | 1396 | spin_lock_init(&fs_info->ref_cache_lock); |
19c00ddc | 1397 | |
58176a96 | 1398 | init_completion(&fs_info->kobj_unregister); |
9f5fae2f CM |
1399 | fs_info->tree_root = tree_root; |
1400 | fs_info->extent_root = extent_root; | |
0b86a832 CM |
1401 | fs_info->chunk_root = chunk_root; |
1402 | fs_info->dev_root = dev_root; | |
8a4b83cc | 1403 | fs_info->fs_devices = fs_devices; |
0b86a832 | 1404 | INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); |
6324fbf3 | 1405 | INIT_LIST_HEAD(&fs_info->space_info); |
0b86a832 | 1406 | btrfs_mapping_init(&fs_info->mapping_tree); |
cb03c743 | 1407 | atomic_set(&fs_info->nr_async_submits, 0); |
8c8bee1d | 1408 | atomic_set(&fs_info->async_submit_draining, 0); |
0986fe9e | 1409 | atomic_set(&fs_info->nr_async_bios, 0); |
a2135011 | 1410 | atomic_set(&fs_info->throttles, 0); |
ab78c84d | 1411 | atomic_set(&fs_info->throttle_gen, 0); |
e20d96d6 | 1412 | fs_info->sb = sb; |
c59f8951 | 1413 | fs_info->max_extent = (u64)-1; |
6f568d35 | 1414 | fs_info->max_inline = 8192 * 1024; |
04160088 | 1415 | setup_bdi(fs_info, &fs_info->bdi); |
d98237b3 CM |
1416 | fs_info->btree_inode = new_inode(sb); |
1417 | fs_info->btree_inode->i_ino = 1; | |
2c90e5d6 | 1418 | fs_info->btree_inode->i_nlink = 1; |
c8b97818 | 1419 | |
4543df7e | 1420 | fs_info->thread_pool_size = min(num_online_cpus() + 2, 8); |
0afbaf8c | 1421 | |
3eaa2885 CM |
1422 | INIT_LIST_HEAD(&fs_info->ordered_extents); |
1423 | spin_lock_init(&fs_info->ordered_extent_lock); | |
1424 | ||
a061fc8d CM |
1425 | sb->s_blocksize = 4096; |
1426 | sb->s_blocksize_bits = blksize_bits(4096); | |
1427 | ||
0afbaf8c CM |
1428 | /* |
1429 | * we set the i_size on the btree inode to the max possible int. | |
1430 | * the real end of the address space is determined by all of | |
1431 | * the devices in the system | |
1432 | */ | |
1433 | fs_info->btree_inode->i_size = OFFSET_MAX; | |
d98237b3 | 1434 | fs_info->btree_inode->i_mapping->a_ops = &btree_aops; |
04160088 CM |
1435 | fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi; |
1436 | ||
d1310b2e | 1437 | extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree, |
5f39d397 CM |
1438 | fs_info->btree_inode->i_mapping, |
1439 | GFP_NOFS); | |
d1310b2e CM |
1440 | extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree, |
1441 | GFP_NOFS); | |
1442 | ||
1443 | BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops; | |
0da5468f | 1444 | |
0f9dd46c JB |
1445 | spin_lock_init(&fs_info->block_group_cache_lock); |
1446 | fs_info->block_group_cache_tree.rb_node = NULL; | |
1447 | ||
d1310b2e | 1448 | extent_io_tree_init(&fs_info->pinned_extents, |
1a5bc167 | 1449 | fs_info->btree_inode->i_mapping, GFP_NOFS); |
d1310b2e | 1450 | extent_io_tree_init(&fs_info->pending_del, |
1a5bc167 | 1451 | fs_info->btree_inode->i_mapping, GFP_NOFS); |
d1310b2e | 1452 | extent_io_tree_init(&fs_info->extent_ins, |
1a5bc167 | 1453 | fs_info->btree_inode->i_mapping, GFP_NOFS); |
e66f709b | 1454 | fs_info->do_barriers = 1; |
e18e4809 | 1455 | |
1a40e23b ZY |
1456 | INIT_LIST_HEAD(&fs_info->dead_reloc_roots); |
1457 | btrfs_leaf_ref_tree_init(&fs_info->reloc_ref_tree); | |
e4657689 ZY |
1458 | btrfs_leaf_ref_tree_init(&fs_info->shared_ref_tree); |
1459 | ||
0f7d52f4 CM |
1460 | BTRFS_I(fs_info->btree_inode)->root = tree_root; |
1461 | memset(&BTRFS_I(fs_info->btree_inode)->location, 0, | |
1462 | sizeof(struct btrfs_key)); | |
22b0ebda | 1463 | insert_inode_hash(fs_info->btree_inode); |
39279cc3 | 1464 | |
79154b1b | 1465 | mutex_init(&fs_info->trans_mutex); |
e02119d5 | 1466 | mutex_init(&fs_info->tree_log_mutex); |
a2135011 | 1467 | mutex_init(&fs_info->drop_mutex); |
25179201 JB |
1468 | mutex_init(&fs_info->extent_ins_mutex); |
1469 | mutex_init(&fs_info->pinned_mutex); | |
925baedd | 1470 | mutex_init(&fs_info->chunk_mutex); |
a74a4b97 CM |
1471 | mutex_init(&fs_info->transaction_kthread_mutex); |
1472 | mutex_init(&fs_info->cleaner_mutex); | |
7d9eb12c | 1473 | mutex_init(&fs_info->volume_mutex); |
1a40e23b | 1474 | mutex_init(&fs_info->tree_reloc_mutex); |
e6dcd2dc | 1475 | init_waitqueue_head(&fs_info->transaction_throttle); |
f9295749 | 1476 | init_waitqueue_head(&fs_info->transaction_wait); |
4854ddd0 | 1477 | init_waitqueue_head(&fs_info->async_submit_wait); |
e02119d5 CM |
1478 | init_waitqueue_head(&fs_info->tree_log_wait); |
1479 | atomic_set(&fs_info->tree_log_commit, 0); | |
1480 | atomic_set(&fs_info->tree_log_writers, 0); | |
1481 | fs_info->tree_log_transid = 0; | |
3768f368 | 1482 | |
19c00ddc CM |
1483 | #if 0 |
1484 | ret = add_hasher(fs_info, "crc32c"); | |
1485 | if (ret) { | |
1486 | printk("btrfs: failed hash setup, modprobe cryptomgr?\n"); | |
1487 | err = -ENOMEM; | |
1488 | goto fail_iput; | |
1489 | } | |
1490 | #endif | |
0b86a832 | 1491 | __setup_root(4096, 4096, 4096, 4096, tree_root, |
2c90e5d6 | 1492 | fs_info, BTRFS_ROOT_TREE_OBJECTID); |
7eccb903 | 1493 | |
d98237b3 | 1494 | |
a061fc8d CM |
1495 | bh = __bread(fs_devices->latest_bdev, |
1496 | BTRFS_SUPER_INFO_OFFSET / 4096, 4096); | |
1497 | if (!bh) | |
39279cc3 | 1498 | goto fail_iput; |
39279cc3 | 1499 | |
a061fc8d CM |
1500 | memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy)); |
1501 | brelse(bh); | |
5f39d397 | 1502 | |
a061fc8d | 1503 | memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE); |
0b86a832 | 1504 | |
5f39d397 | 1505 | disk_super = &fs_info->super_copy; |
0f7d52f4 | 1506 | if (!btrfs_super_root(disk_super)) |
39279cc3 | 1507 | goto fail_sb_buffer; |
0f7d52f4 | 1508 | |
edf24abe CH |
1509 | err = btrfs_parse_options(tree_root, options); |
1510 | if (err) | |
1511 | goto fail_sb_buffer; | |
dfe25020 | 1512 | |
4543df7e CM |
1513 | /* |
1514 | * we need to start all the end_io workers up front because the | |
1515 | * queue work function gets called at interrupt time, and so it | |
1516 | * cannot dynamically grow. | |
1517 | */ | |
5443be45 CM |
1518 | btrfs_init_workers(&fs_info->workers, "worker", |
1519 | fs_info->thread_pool_size); | |
c8b97818 | 1520 | |
5443be45 | 1521 | btrfs_init_workers(&fs_info->submit_workers, "submit", |
b720d209 CM |
1522 | min_t(u64, fs_devices->num_devices, |
1523 | fs_info->thread_pool_size)); | |
61b49440 CM |
1524 | |
1525 | /* a higher idle thresh on the submit workers makes it much more | |
1526 | * likely that bios will be send down in a sane order to the | |
1527 | * devices | |
1528 | */ | |
1529 | fs_info->submit_workers.idle_thresh = 64; | |
53863232 CM |
1530 | |
1531 | /* fs_info->workers is responsible for checksumming file data | |
1532 | * blocks and metadata. Using a larger idle thresh allows each | |
1533 | * worker thread to operate on things in roughly the order they | |
1534 | * were sent by the writeback daemons, improving overall locality | |
1535 | * of the IO going down the pipe. | |
1536 | */ | |
1537 | fs_info->workers.idle_thresh = 128; | |
61b49440 | 1538 | |
5443be45 CM |
1539 | btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1); |
1540 | btrfs_init_workers(&fs_info->endio_workers, "endio", | |
1541 | fs_info->thread_pool_size); | |
1542 | btrfs_init_workers(&fs_info->endio_write_workers, "endio-write", | |
e6dcd2dc | 1543 | fs_info->thread_pool_size); |
61b49440 CM |
1544 | |
1545 | /* | |
1546 | * endios are largely parallel and should have a very | |
1547 | * low idle thresh | |
1548 | */ | |
1549 | fs_info->endio_workers.idle_thresh = 4; | |
3a5f1d45 | 1550 | fs_info->endio_write_workers.idle_thresh = 64; |
61b49440 | 1551 | |
4543df7e | 1552 | btrfs_start_workers(&fs_info->workers, 1); |
1cc127b5 | 1553 | btrfs_start_workers(&fs_info->submit_workers, 1); |
247e743c | 1554 | btrfs_start_workers(&fs_info->fixup_workers, 1); |
4543df7e | 1555 | btrfs_start_workers(&fs_info->endio_workers, fs_info->thread_pool_size); |
e6dcd2dc CM |
1556 | btrfs_start_workers(&fs_info->endio_write_workers, |
1557 | fs_info->thread_pool_size); | |
4543df7e | 1558 | |
edf24abe | 1559 | err = -EINVAL; |
a0af469b | 1560 | if (btrfs_super_num_devices(disk_super) > fs_devices->open_devices) { |
8a4b83cc CM |
1561 | printk("Btrfs: wanted %llu devices, but found %llu\n", |
1562 | (unsigned long long)btrfs_super_num_devices(disk_super), | |
a0af469b | 1563 | (unsigned long long)fs_devices->open_devices); |
dfe25020 CM |
1564 | if (btrfs_test_opt(tree_root, DEGRADED)) |
1565 | printk("continuing in degraded mode\n"); | |
1566 | else { | |
1567 | goto fail_sb_buffer; | |
1568 | } | |
8a4b83cc | 1569 | } |
dfe25020 | 1570 | |
4575c9cc | 1571 | fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super); |
c8b97818 CM |
1572 | fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages, |
1573 | 4 * 1024 * 1024 / PAGE_CACHE_SIZE); | |
4575c9cc | 1574 | |
db94535d CM |
1575 | nodesize = btrfs_super_nodesize(disk_super); |
1576 | leafsize = btrfs_super_leafsize(disk_super); | |
1577 | sectorsize = btrfs_super_sectorsize(disk_super); | |
87ee04eb | 1578 | stripesize = btrfs_super_stripesize(disk_super); |
db94535d CM |
1579 | tree_root->nodesize = nodesize; |
1580 | tree_root->leafsize = leafsize; | |
1581 | tree_root->sectorsize = sectorsize; | |
87ee04eb | 1582 | tree_root->stripesize = stripesize; |
a061fc8d CM |
1583 | |
1584 | sb->s_blocksize = sectorsize; | |
1585 | sb->s_blocksize_bits = blksize_bits(sectorsize); | |
db94535d | 1586 | |
39279cc3 CM |
1587 | if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC, |
1588 | sizeof(disk_super->magic))) { | |
1589 | printk("btrfs: valid FS not found on %s\n", sb->s_id); | |
1590 | goto fail_sb_buffer; | |
1591 | } | |
19c00ddc | 1592 | |
925baedd | 1593 | mutex_lock(&fs_info->chunk_mutex); |
0b86a832 | 1594 | ret = btrfs_read_sys_array(tree_root); |
925baedd | 1595 | mutex_unlock(&fs_info->chunk_mutex); |
84eed90f CM |
1596 | if (ret) { |
1597 | printk("btrfs: failed to read the system array on %s\n", | |
1598 | sb->s_id); | |
1599 | goto fail_sys_array; | |
1600 | } | |
0b86a832 CM |
1601 | |
1602 | blocksize = btrfs_level_size(tree_root, | |
1603 | btrfs_super_chunk_root_level(disk_super)); | |
84234f3a | 1604 | generation = btrfs_super_chunk_root_generation(disk_super); |
0b86a832 CM |
1605 | |
1606 | __setup_root(nodesize, leafsize, sectorsize, stripesize, | |
1607 | chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID); | |
1608 | ||
1609 | chunk_root->node = read_tree_block(chunk_root, | |
1610 | btrfs_super_chunk_root(disk_super), | |
84234f3a | 1611 | blocksize, generation); |
0b86a832 CM |
1612 | BUG_ON(!chunk_root->node); |
1613 | ||
e17cade2 CM |
1614 | read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid, |
1615 | (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node), | |
1616 | BTRFS_UUID_SIZE); | |
1617 | ||
925baedd | 1618 | mutex_lock(&fs_info->chunk_mutex); |
0b86a832 | 1619 | ret = btrfs_read_chunk_tree(chunk_root); |
925baedd | 1620 | mutex_unlock(&fs_info->chunk_mutex); |
0b86a832 CM |
1621 | BUG_ON(ret); |
1622 | ||
dfe25020 CM |
1623 | btrfs_close_extra_devices(fs_devices); |
1624 | ||
db94535d CM |
1625 | blocksize = btrfs_level_size(tree_root, |
1626 | btrfs_super_root_level(disk_super)); | |
84234f3a | 1627 | generation = btrfs_super_generation(disk_super); |
0b86a832 | 1628 | |
e20d96d6 | 1629 | tree_root->node = read_tree_block(tree_root, |
db94535d | 1630 | btrfs_super_root(disk_super), |
84234f3a | 1631 | blocksize, generation); |
39279cc3 CM |
1632 | if (!tree_root->node) |
1633 | goto fail_sb_buffer; | |
3768f368 | 1634 | |
db94535d CM |
1635 | |
1636 | ret = find_and_setup_root(tree_root, fs_info, | |
e20d96d6 | 1637 | BTRFS_EXTENT_TREE_OBJECTID, extent_root); |
0b86a832 | 1638 | if (ret) |
39279cc3 | 1639 | goto fail_tree_root; |
0b86a832 CM |
1640 | extent_root->track_dirty = 1; |
1641 | ||
1642 | ret = find_and_setup_root(tree_root, fs_info, | |
1643 | BTRFS_DEV_TREE_OBJECTID, dev_root); | |
1644 | dev_root->track_dirty = 1; | |
1645 | ||
1646 | if (ret) | |
1647 | goto fail_extent_root; | |
3768f368 | 1648 | |
9078a3e1 CM |
1649 | btrfs_read_block_groups(extent_root); |
1650 | ||
0f7d52f4 | 1651 | fs_info->generation = btrfs_super_generation(disk_super) + 1; |
d18a2c44 CM |
1652 | fs_info->data_alloc_profile = (u64)-1; |
1653 | fs_info->metadata_alloc_profile = (u64)-1; | |
1654 | fs_info->system_alloc_profile = fs_info->metadata_alloc_profile; | |
a74a4b97 CM |
1655 | fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root, |
1656 | "btrfs-cleaner"); | |
1657 | if (!fs_info->cleaner_kthread) | |
1658 | goto fail_extent_root; | |
1659 | ||
1660 | fs_info->transaction_kthread = kthread_run(transaction_kthread, | |
1661 | tree_root, | |
1662 | "btrfs-transaction"); | |
1663 | if (!fs_info->transaction_kthread) | |
3f157a2f | 1664 | goto fail_cleaner; |
a74a4b97 | 1665 | |
e02119d5 CM |
1666 | if (btrfs_super_log_root(disk_super) != 0) { |
1667 | u32 blocksize; | |
1668 | u64 bytenr = btrfs_super_log_root(disk_super); | |
1669 | ||
1670 | blocksize = | |
1671 | btrfs_level_size(tree_root, | |
1672 | btrfs_super_log_root_level(disk_super)); | |
d18a2c44 | 1673 | |
e02119d5 CM |
1674 | log_tree_root = kzalloc(sizeof(struct btrfs_root), |
1675 | GFP_NOFS); | |
1676 | ||
1677 | __setup_root(nodesize, leafsize, sectorsize, stripesize, | |
1678 | log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID); | |
1679 | ||
1680 | log_tree_root->node = read_tree_block(tree_root, bytenr, | |
84234f3a YZ |
1681 | blocksize, |
1682 | generation + 1); | |
e02119d5 CM |
1683 | ret = btrfs_recover_log_trees(log_tree_root); |
1684 | BUG_ON(ret); | |
1685 | } | |
84234f3a | 1686 | fs_info->last_trans_committed = btrfs_super_generation(disk_super); |
1a40e23b ZY |
1687 | |
1688 | ret = btrfs_cleanup_reloc_trees(tree_root); | |
1689 | BUG_ON(ret); | |
1690 | ||
0f7d52f4 | 1691 | return tree_root; |
39279cc3 | 1692 | |
3f157a2f | 1693 | fail_cleaner: |
a74a4b97 | 1694 | kthread_stop(fs_info->cleaner_kthread); |
0b86a832 CM |
1695 | fail_extent_root: |
1696 | free_extent_buffer(extent_root->node); | |
39279cc3 | 1697 | fail_tree_root: |
5f39d397 | 1698 | free_extent_buffer(tree_root->node); |
84eed90f | 1699 | fail_sys_array: |
39279cc3 | 1700 | fail_sb_buffer: |
247e743c | 1701 | btrfs_stop_workers(&fs_info->fixup_workers); |
8b712842 CM |
1702 | btrfs_stop_workers(&fs_info->workers); |
1703 | btrfs_stop_workers(&fs_info->endio_workers); | |
e6dcd2dc | 1704 | btrfs_stop_workers(&fs_info->endio_write_workers); |
1cc127b5 | 1705 | btrfs_stop_workers(&fs_info->submit_workers); |
4543df7e CM |
1706 | fail_iput: |
1707 | iput(fs_info->btree_inode); | |
39279cc3 | 1708 | fail: |
dfe25020 | 1709 | btrfs_close_devices(fs_info->fs_devices); |
84eed90f CM |
1710 | btrfs_mapping_tree_free(&fs_info->mapping_tree); |
1711 | ||
39279cc3 CM |
1712 | kfree(extent_root); |
1713 | kfree(tree_root); | |
2d2ae547 | 1714 | bdi_destroy(&fs_info->bdi); |
39279cc3 | 1715 | kfree(fs_info); |
83afeac4 JM |
1716 | kfree(chunk_root); |
1717 | kfree(dev_root); | |
39279cc3 | 1718 | return ERR_PTR(err); |
eb60ceac CM |
1719 | } |
1720 | ||
f2984462 CM |
1721 | static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate) |
1722 | { | |
1723 | char b[BDEVNAME_SIZE]; | |
1724 | ||
1725 | if (uptodate) { | |
1726 | set_buffer_uptodate(bh); | |
1727 | } else { | |
1728 | if (!buffer_eopnotsupp(bh) && printk_ratelimit()) { | |
1729 | printk(KERN_WARNING "lost page write due to " | |
1730 | "I/O error on %s\n", | |
1731 | bdevname(bh->b_bdev, b)); | |
1732 | } | |
1259ab75 CM |
1733 | /* note, we dont' set_buffer_write_io_error because we have |
1734 | * our own ways of dealing with the IO errors | |
1735 | */ | |
f2984462 CM |
1736 | clear_buffer_uptodate(bh); |
1737 | } | |
1738 | unlock_buffer(bh); | |
1739 | put_bh(bh); | |
1740 | } | |
1741 | ||
1742 | int write_all_supers(struct btrfs_root *root) | |
1743 | { | |
1744 | struct list_head *cur; | |
1745 | struct list_head *head = &root->fs_info->fs_devices->devices; | |
1746 | struct btrfs_device *dev; | |
a061fc8d | 1747 | struct btrfs_super_block *sb; |
f2984462 CM |
1748 | struct btrfs_dev_item *dev_item; |
1749 | struct buffer_head *bh; | |
1750 | int ret; | |
1751 | int do_barriers; | |
a236aed1 CM |
1752 | int max_errors; |
1753 | int total_errors = 0; | |
a061fc8d CM |
1754 | u32 crc; |
1755 | u64 flags; | |
f2984462 | 1756 | |
a236aed1 | 1757 | max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1; |
f2984462 CM |
1758 | do_barriers = !btrfs_test_opt(root, NOBARRIER); |
1759 | ||
a061fc8d CM |
1760 | sb = &root->fs_info->super_for_commit; |
1761 | dev_item = &sb->dev_item; | |
f2984462 CM |
1762 | list_for_each(cur, head) { |
1763 | dev = list_entry(cur, struct btrfs_device, dev_list); | |
dfe25020 CM |
1764 | if (!dev->bdev) { |
1765 | total_errors++; | |
1766 | continue; | |
1767 | } | |
1768 | if (!dev->in_fs_metadata) | |
1769 | continue; | |
1770 | ||
a061fc8d CM |
1771 | btrfs_set_stack_device_type(dev_item, dev->type); |
1772 | btrfs_set_stack_device_id(dev_item, dev->devid); | |
1773 | btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes); | |
1774 | btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used); | |
1775 | btrfs_set_stack_device_io_align(dev_item, dev->io_align); | |
1776 | btrfs_set_stack_device_io_width(dev_item, dev->io_width); | |
1777 | btrfs_set_stack_device_sector_size(dev_item, dev->sector_size); | |
1778 | memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE); | |
1779 | flags = btrfs_super_flags(sb); | |
1780 | btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN); | |
1781 | ||
1782 | ||
1783 | crc = ~(u32)0; | |
1784 | crc = btrfs_csum_data(root, (char *)sb + BTRFS_CSUM_SIZE, crc, | |
1785 | BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE); | |
1786 | btrfs_csum_final(crc, sb->csum); | |
1787 | ||
1788 | bh = __getblk(dev->bdev, BTRFS_SUPER_INFO_OFFSET / 4096, | |
f2984462 CM |
1789 | BTRFS_SUPER_INFO_SIZE); |
1790 | ||
a061fc8d | 1791 | memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE); |
f2984462 CM |
1792 | dev->pending_io = bh; |
1793 | ||
1794 | get_bh(bh); | |
1795 | set_buffer_uptodate(bh); | |
1796 | lock_buffer(bh); | |
1797 | bh->b_end_io = btrfs_end_buffer_write_sync; | |
1798 | ||
1799 | if (do_barriers && dev->barriers) { | |
1800 | ret = submit_bh(WRITE_BARRIER, bh); | |
1801 | if (ret == -EOPNOTSUPP) { | |
1802 | printk("btrfs: disabling barriers on dev %s\n", | |
1803 | dev->name); | |
1804 | set_buffer_uptodate(bh); | |
1805 | dev->barriers = 0; | |
1806 | get_bh(bh); | |
1807 | lock_buffer(bh); | |
1808 | ret = submit_bh(WRITE, bh); | |
1809 | } | |
1810 | } else { | |
1811 | ret = submit_bh(WRITE, bh); | |
1812 | } | |
a236aed1 CM |
1813 | if (ret) |
1814 | total_errors++; | |
f2984462 | 1815 | } |
a236aed1 CM |
1816 | if (total_errors > max_errors) { |
1817 | printk("btrfs: %d errors while writing supers\n", total_errors); | |
1818 | BUG(); | |
1819 | } | |
1820 | total_errors = 0; | |
f2984462 CM |
1821 | |
1822 | list_for_each(cur, head) { | |
1823 | dev = list_entry(cur, struct btrfs_device, dev_list); | |
dfe25020 CM |
1824 | if (!dev->bdev) |
1825 | continue; | |
1826 | if (!dev->in_fs_metadata) | |
1827 | continue; | |
1828 | ||
f2984462 CM |
1829 | BUG_ON(!dev->pending_io); |
1830 | bh = dev->pending_io; | |
1831 | wait_on_buffer(bh); | |
1832 | if (!buffer_uptodate(dev->pending_io)) { | |
1833 | if (do_barriers && dev->barriers) { | |
1834 | printk("btrfs: disabling barriers on dev %s\n", | |
1835 | dev->name); | |
1836 | set_buffer_uptodate(bh); | |
1837 | get_bh(bh); | |
1838 | lock_buffer(bh); | |
1839 | dev->barriers = 0; | |
1840 | ret = submit_bh(WRITE, bh); | |
1841 | BUG_ON(ret); | |
1842 | wait_on_buffer(bh); | |
1259ab75 CM |
1843 | if (!buffer_uptodate(bh)) |
1844 | total_errors++; | |
f2984462 | 1845 | } else { |
a236aed1 | 1846 | total_errors++; |
f2984462 CM |
1847 | } |
1848 | ||
1849 | } | |
1850 | dev->pending_io = NULL; | |
1851 | brelse(bh); | |
1852 | } | |
a236aed1 CM |
1853 | if (total_errors > max_errors) { |
1854 | printk("btrfs: %d errors while writing supers\n", total_errors); | |
1855 | BUG(); | |
1856 | } | |
f2984462 CM |
1857 | return 0; |
1858 | } | |
1859 | ||
e089f05c | 1860 | int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root |
79154b1b | 1861 | *root) |
eb60ceac | 1862 | { |
e66f709b | 1863 | int ret; |
5f39d397 | 1864 | |
f2984462 | 1865 | ret = write_all_supers(root); |
5f39d397 | 1866 | return ret; |
cfaa7295 CM |
1867 | } |
1868 | ||
5eda7b5e | 1869 | int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root) |
2619ba1f CM |
1870 | { |
1871 | radix_tree_delete(&fs_info->fs_roots_radix, | |
1872 | (unsigned long)root->root_key.objectid); | |
b99aa6cb CM |
1873 | if (root->in_sysfs) |
1874 | btrfs_sysfs_del_root(root); | |
2619ba1f CM |
1875 | if (root->inode) |
1876 | iput(root->inode); | |
1877 | if (root->node) | |
5f39d397 | 1878 | free_extent_buffer(root->node); |
2619ba1f | 1879 | if (root->commit_root) |
5f39d397 | 1880 | free_extent_buffer(root->commit_root); |
58176a96 JB |
1881 | if (root->name) |
1882 | kfree(root->name); | |
2619ba1f CM |
1883 | kfree(root); |
1884 | return 0; | |
1885 | } | |
1886 | ||
35b7e476 | 1887 | static int del_fs_roots(struct btrfs_fs_info *fs_info) |
0f7d52f4 CM |
1888 | { |
1889 | int ret; | |
1890 | struct btrfs_root *gang[8]; | |
1891 | int i; | |
1892 | ||
1893 | while(1) { | |
1894 | ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, | |
1895 | (void **)gang, 0, | |
1896 | ARRAY_SIZE(gang)); | |
1897 | if (!ret) | |
1898 | break; | |
2619ba1f | 1899 | for (i = 0; i < ret; i++) |
5eda7b5e | 1900 | btrfs_free_fs_root(fs_info, gang[i]); |
0f7d52f4 CM |
1901 | } |
1902 | return 0; | |
1903 | } | |
b4100d64 | 1904 | |
e20d96d6 | 1905 | int close_ctree(struct btrfs_root *root) |
cfaa7295 | 1906 | { |
3768f368 | 1907 | int ret; |
e089f05c | 1908 | struct btrfs_trans_handle *trans; |
0f7d52f4 | 1909 | struct btrfs_fs_info *fs_info = root->fs_info; |
e089f05c | 1910 | |
facda1e7 | 1911 | fs_info->closing = 1; |
a2135011 CM |
1912 | smp_mb(); |
1913 | ||
a74a4b97 CM |
1914 | kthread_stop(root->fs_info->transaction_kthread); |
1915 | kthread_stop(root->fs_info->cleaner_kthread); | |
1916 | ||
a74a4b97 | 1917 | btrfs_clean_old_snapshots(root); |
79154b1b | 1918 | trans = btrfs_start_transaction(root, 1); |
54aa1f4d | 1919 | ret = btrfs_commit_transaction(trans, root); |
79154b1b CM |
1920 | /* run commit again to drop the original snapshot */ |
1921 | trans = btrfs_start_transaction(root, 1); | |
1922 | btrfs_commit_transaction(trans, root); | |
1923 | ret = btrfs_write_and_wait_transaction(NULL, root); | |
3768f368 | 1924 | BUG_ON(ret); |
d6bfde87 | 1925 | |
79154b1b | 1926 | write_ctree_super(NULL, root); |
0f7d52f4 | 1927 | |
b0c68f8b CM |
1928 | if (fs_info->delalloc_bytes) { |
1929 | printk("btrfs: at unmount delalloc count %Lu\n", | |
1930 | fs_info->delalloc_bytes); | |
1931 | } | |
31153d81 YZ |
1932 | if (fs_info->total_ref_cache_size) { |
1933 | printk("btrfs: at umount reference cache size %Lu\n", | |
1934 | fs_info->total_ref_cache_size); | |
1935 | } | |
bcc63abb | 1936 | |
0f7d52f4 | 1937 | if (fs_info->extent_root->node) |
5f39d397 | 1938 | free_extent_buffer(fs_info->extent_root->node); |
f510cfec | 1939 | |
0f7d52f4 | 1940 | if (fs_info->tree_root->node) |
5f39d397 | 1941 | free_extent_buffer(fs_info->tree_root->node); |
f510cfec | 1942 | |
0b86a832 CM |
1943 | if (root->fs_info->chunk_root->node); |
1944 | free_extent_buffer(root->fs_info->chunk_root->node); | |
1945 | ||
1946 | if (root->fs_info->dev_root->node); | |
1947 | free_extent_buffer(root->fs_info->dev_root->node); | |
1948 | ||
9078a3e1 | 1949 | btrfs_free_block_groups(root->fs_info); |
4ca8b41e | 1950 | fs_info->closing = 2; |
0f7d52f4 | 1951 | del_fs_roots(fs_info); |
d10c5f31 CM |
1952 | |
1953 | filemap_write_and_wait(fs_info->btree_inode->i_mapping); | |
1954 | ||
db94535d | 1955 | truncate_inode_pages(fs_info->btree_inode->i_mapping, 0); |
9ad6b7bc | 1956 | |
247e743c | 1957 | btrfs_stop_workers(&fs_info->fixup_workers); |
8b712842 CM |
1958 | btrfs_stop_workers(&fs_info->workers); |
1959 | btrfs_stop_workers(&fs_info->endio_workers); | |
e6dcd2dc | 1960 | btrfs_stop_workers(&fs_info->endio_write_workers); |
1cc127b5 | 1961 | btrfs_stop_workers(&fs_info->submit_workers); |
d6bfde87 | 1962 | |
db94535d | 1963 | iput(fs_info->btree_inode); |
19c00ddc CM |
1964 | #if 0 |
1965 | while(!list_empty(&fs_info->hashers)) { | |
1966 | struct btrfs_hasher *hasher; | |
1967 | hasher = list_entry(fs_info->hashers.next, struct btrfs_hasher, | |
1968 | hashers); | |
1969 | list_del(&hasher->hashers); | |
1970 | crypto_free_hash(&fs_info->hash_tfm); | |
1971 | kfree(hasher); | |
1972 | } | |
1973 | #endif | |
dfe25020 | 1974 | btrfs_close_devices(fs_info->fs_devices); |
0b86a832 | 1975 | btrfs_mapping_tree_free(&fs_info->mapping_tree); |
b248a415 | 1976 | |
04160088 | 1977 | bdi_destroy(&fs_info->bdi); |
0b86a832 | 1978 | |
0f7d52f4 | 1979 | kfree(fs_info->extent_root); |
0f7d52f4 | 1980 | kfree(fs_info->tree_root); |
0b86a832 CM |
1981 | kfree(fs_info->chunk_root); |
1982 | kfree(fs_info->dev_root); | |
eb60ceac CM |
1983 | return 0; |
1984 | } | |
1985 | ||
1259ab75 | 1986 | int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid) |
5f39d397 | 1987 | { |
1259ab75 | 1988 | int ret; |
810191ff | 1989 | struct inode *btree_inode = buf->first_page->mapping->host; |
1259ab75 CM |
1990 | |
1991 | ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf); | |
1992 | if (!ret) | |
1993 | return ret; | |
1994 | ||
1995 | ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf, | |
1996 | parent_transid); | |
1997 | return !ret; | |
5f39d397 CM |
1998 | } |
1999 | ||
2000 | int btrfs_set_buffer_uptodate(struct extent_buffer *buf) | |
ccd467d6 | 2001 | { |
810191ff | 2002 | struct inode *btree_inode = buf->first_page->mapping->host; |
d1310b2e | 2003 | return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, |
5f39d397 CM |
2004 | buf); |
2005 | } | |
6702ed49 | 2006 | |
5f39d397 CM |
2007 | void btrfs_mark_buffer_dirty(struct extent_buffer *buf) |
2008 | { | |
810191ff | 2009 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; |
5f39d397 CM |
2010 | u64 transid = btrfs_header_generation(buf); |
2011 | struct inode *btree_inode = root->fs_info->btree_inode; | |
6702ed49 | 2012 | |
925baedd | 2013 | WARN_ON(!btrfs_tree_locked(buf)); |
ccd467d6 CM |
2014 | if (transid != root->fs_info->generation) { |
2015 | printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n", | |
db94535d | 2016 | (unsigned long long)buf->start, |
ccd467d6 CM |
2017 | transid, root->fs_info->generation); |
2018 | WARN_ON(1); | |
2019 | } | |
d1310b2e | 2020 | set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, buf); |
eb60ceac CM |
2021 | } |
2022 | ||
d3c2fdcf | 2023 | void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr) |
35b7e476 | 2024 | { |
188de649 CM |
2025 | /* |
2026 | * looks as though older kernels can get into trouble with | |
2027 | * this code, they end up stuck in balance_dirty_pages forever | |
2028 | */ | |
d6bfde87 CM |
2029 | struct extent_io_tree *tree; |
2030 | u64 num_dirty; | |
2031 | u64 start = 0; | |
b64a2851 | 2032 | unsigned long thresh = 96 * 1024 * 1024; |
d6bfde87 CM |
2033 | tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; |
2034 | ||
b64a2851 | 2035 | if (current_is_pdflush() || current->flags & PF_MEMALLOC) |
d6bfde87 CM |
2036 | return; |
2037 | ||
2038 | num_dirty = count_range_bits(tree, &start, (u64)-1, | |
2039 | thresh, EXTENT_DIRTY); | |
2040 | if (num_dirty > thresh) { | |
2041 | balance_dirty_pages_ratelimited_nr( | |
d7fc640e | 2042 | root->fs_info->btree_inode->i_mapping, 1); |
d6bfde87 | 2043 | } |
188de649 | 2044 | return; |
35b7e476 | 2045 | } |
6b80053d | 2046 | |
ca7a79ad | 2047 | int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid) |
6b80053d | 2048 | { |
810191ff | 2049 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; |
ce9adaa5 | 2050 | int ret; |
ca7a79ad | 2051 | ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); |
ce9adaa5 CM |
2052 | if (ret == 0) { |
2053 | buf->flags |= EXTENT_UPTODATE; | |
2054 | } | |
2055 | return ret; | |
6b80053d | 2056 | } |
0da5468f | 2057 | |
4bef0848 CM |
2058 | int btree_lock_page_hook(struct page *page) |
2059 | { | |
2060 | struct inode *inode = page->mapping->host; | |
2061 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2062 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
2063 | struct extent_buffer *eb; | |
2064 | unsigned long len; | |
2065 | u64 bytenr = page_offset(page); | |
2066 | ||
2067 | if (page->private == EXTENT_PAGE_PRIVATE) | |
2068 | goto out; | |
2069 | ||
2070 | len = page->private >> 2; | |
2071 | eb = find_extent_buffer(io_tree, bytenr, len, GFP_NOFS); | |
2072 | if (!eb) | |
2073 | goto out; | |
2074 | ||
2075 | btrfs_tree_lock(eb); | |
2076 | spin_lock(&root->fs_info->hash_lock); | |
2077 | btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); | |
2078 | spin_unlock(&root->fs_info->hash_lock); | |
2079 | btrfs_tree_unlock(eb); | |
2080 | free_extent_buffer(eb); | |
2081 | out: | |
2082 | lock_page(page); | |
2083 | return 0; | |
2084 | } | |
2085 | ||
d1310b2e | 2086 | static struct extent_io_ops btree_extent_io_ops = { |
4bef0848 | 2087 | .write_cache_pages_lock_hook = btree_lock_page_hook, |
ce9adaa5 | 2088 | .readpage_end_io_hook = btree_readpage_end_io_hook, |
0b86a832 | 2089 | .submit_bio_hook = btree_submit_bio_hook, |
239b14b3 CM |
2090 | /* note we're sharing with inode.c for the merge bio hook */ |
2091 | .merge_bio_hook = btrfs_merge_bio_hook, | |
0da5468f | 2092 | }; |