blob: 26a18779e84bb3df55e62f79630218010202326e [file] [log] [blame]
Chris Mason6cbd5572007-06-12 09:07:21 -04001/*
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
Chris Masone20d96d2007-03-22 12:13:20 -040019#include <linux/fs.h>
Chris Masond98237b2007-03-28 13:57:48 -040020#include <linux/blkdev.h>
Chris Mason87cbda52007-03-28 19:44:27 -040021#include <linux/scatterlist.h>
Chris Mason22b0ebd2007-03-30 08:47:31 -040022#include <linux/swap.h>
Chris Mason0f7d52f2007-04-09 10:42:37 -040023#include <linux/radix-tree.h>
Chris Mason35b7e472007-05-02 15:53:43 -040024#include <linux/writeback.h>
Chris Masond3977122009-01-05 21:25:51 -050025#include <linux/buffer_head.h>
Chris Masonce9adaa2008-04-09 16:28:12 -040026#include <linux/workqueue.h>
Chris Masona74a4b92008-06-25 16:01:31 -040027#include <linux/kthread.h>
Chris Mason4b4e25f2008-11-20 10:22:27 -050028#include <linux/freezer.h>
29#include "compat.h"
Miguela5eb62e2008-04-11 15:45:51 -040030#include "crc32c.h"
Chris Masoneb60cea2007-02-02 09:18:22 -050031#include "ctree.h"
32#include "disk-io.h"
Chris Masone089f052007-03-16 16:20:31 -040033#include "transaction.h"
Chris Mason0f7d52f2007-04-09 10:42:37 -040034#include "btrfs_inode.h"
Chris Mason0b86a832008-03-24 15:01:56 -040035#include "volumes.h"
Chris Masondb945352007-10-15 16:15:53 -040036#include "print-tree.h"
Chris Mason8b712842008-06-11 16:50:36 -040037#include "async-thread.h"
Chris Mason925baed2008-06-25 16:01:30 -040038#include "locking.h"
Chris Mason017e5362008-07-28 15:32:51 -040039#include "ref-cache.h"
Chris Masone02119d2008-09-05 16:13:11 -040040#include "tree-log.h"
Chris Masoneb60cea2007-02-02 09:18:22 -050041
Chris Masond1310b22008-01-24 16:13:08 -050042static struct extent_io_ops btree_extent_io_ops;
Chris Mason8b712842008-06-11 16:50:36 -040043static void end_workqueue_fn(struct btrfs_work *work);
Chris Masonce9adaa2008-04-09 16:28:12 -040044
Chris Masond352ac62008-09-29 15:18:18 -040045/*
46 * end_io_wq structs are used to do processing in task context when an IO is
47 * complete. This is used during reads to verify checksums, and it is used
48 * by writes to insert metadata for new file extents after IO is complete.
49 */
Chris Masonce9adaa2008-04-09 16:28:12 -040050struct end_io_wq {
51 struct bio *bio;
52 bio_end_io_t *end_io;
53 void *private;
54 struct btrfs_fs_info *info;
55 int error;
Chris Mason22c59942008-04-09 16:28:12 -040056 int metadata;
Chris Masonce9adaa2008-04-09 16:28:12 -040057 struct list_head list;
Chris Mason8b712842008-06-11 16:50:36 -040058 struct btrfs_work work;
Chris Masonce9adaa2008-04-09 16:28:12 -040059};
Chris Mason0da54682007-11-07 21:08:01 -050060
Chris Masond352ac62008-09-29 15:18:18 -040061/*
62 * async submit bios are used to offload expensive checksumming
63 * onto the worker threads. They checksum file and metadata bios
64 * just before they are sent down the IO stack.
65 */
Chris Mason44b8bd72008-04-16 11:14:51 -040066struct async_submit_bio {
67 struct inode *inode;
68 struct bio *bio;
69 struct list_head list;
Chris Mason4a69a412008-11-06 22:03:00 -050070 extent_submit_bio_hook_t *submit_bio_start;
71 extent_submit_bio_hook_t *submit_bio_done;
Chris Mason44b8bd72008-04-16 11:14:51 -040072 int rw;
73 int mirror_num;
Chris Masonc8b97812008-10-29 14:49:59 -040074 unsigned long bio_flags;
Chris Mason8b712842008-06-11 16:50:36 -040075 struct btrfs_work work;
Chris Mason44b8bd72008-04-16 11:14:51 -040076};
77
Chris Masond352ac62008-09-29 15:18:18 -040078/*
79 * extents on the btree inode are pretty simple, there's one extent
80 * that covers the entire device
81 */
Christoph Hellwigb2950862008-12-02 09:54:17 -050082static struct extent_map *btree_get_extent(struct inode *inode,
83 struct page *page, size_t page_offset, u64 start, u64 len,
84 int create)
Chris Mason5f39d392007-10-15 16:14:19 -040085{
86 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
87 struct extent_map *em;
88 int ret;
Chris Masond98237b2007-03-28 13:57:48 -040089
Chris Masond1310b22008-01-24 16:13:08 -050090 spin_lock(&em_tree->lock);
91 em = lookup_extent_mapping(em_tree, start, len);
Chris Masona061fc82008-05-07 11:43:44 -040092 if (em) {
93 em->bdev =
94 BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
95 spin_unlock(&em_tree->lock);
Chris Mason5f39d392007-10-15 16:14:19 -040096 goto out;
Chris Masona061fc82008-05-07 11:43:44 -040097 }
98 spin_unlock(&em_tree->lock);
Chris Mason7b13b7b2008-04-18 10:29:50 -040099
Chris Mason5f39d392007-10-15 16:14:19 -0400100 em = alloc_extent_map(GFP_NOFS);
101 if (!em) {
102 em = ERR_PTR(-ENOMEM);
103 goto out;
104 }
105 em->start = 0;
Chris Mason0afbaf82008-04-18 14:17:20 -0400106 em->len = (u64)-1;
Chris Masonc8b97812008-10-29 14:49:59 -0400107 em->block_len = (u64)-1;
Chris Mason5f39d392007-10-15 16:14:19 -0400108 em->block_start = 0;
Chris Masona061fc82008-05-07 11:43:44 -0400109 em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
Chris Masond1310b22008-01-24 16:13:08 -0500110
111 spin_lock(&em_tree->lock);
Chris Mason5f39d392007-10-15 16:14:19 -0400112 ret = add_extent_mapping(em_tree, em);
113 if (ret == -EEXIST) {
Chris Mason0afbaf82008-04-18 14:17:20 -0400114 u64 failed_start = em->start;
115 u64 failed_len = em->len;
116
Chris Mason5f39d392007-10-15 16:14:19 -0400117 free_extent_map(em);
Chris Mason7b13b7b2008-04-18 10:29:50 -0400118 em = lookup_extent_mapping(em_tree, start, len);
Chris Mason0afbaf82008-04-18 14:17:20 -0400119 if (em) {
Chris Mason7b13b7b2008-04-18 10:29:50 -0400120 ret = 0;
Chris Mason0afbaf82008-04-18 14:17:20 -0400121 } else {
122 em = lookup_extent_mapping(em_tree, failed_start,
123 failed_len);
Chris Mason7b13b7b2008-04-18 10:29:50 -0400124 ret = -EIO;
Chris Mason0afbaf82008-04-18 14:17:20 -0400125 }
Chris Mason5f39d392007-10-15 16:14:19 -0400126 } else if (ret) {
Chris Mason7b13b7b2008-04-18 10:29:50 -0400127 free_extent_map(em);
128 em = NULL;
Chris Mason5f39d392007-10-15 16:14:19 -0400129 }
Chris Mason7b13b7b2008-04-18 10:29:50 -0400130 spin_unlock(&em_tree->lock);
131
132 if (ret)
133 em = ERR_PTR(ret);
Chris Mason5f39d392007-10-15 16:14:19 -0400134out:
135 return em;
136}
137
Chris Mason19c00dd2007-10-15 16:19:22 -0400138u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
139{
Miguela5eb62e2008-04-11 15:45:51 -0400140 return btrfs_crc32c(seed, data, len);
Chris Mason19c00dd2007-10-15 16:19:22 -0400141}
142
143void btrfs_csum_final(u32 crc, char *result)
144{
145 *(__le32 *)result = ~cpu_to_le32(crc);
146}
147
Chris Masond352ac62008-09-29 15:18:18 -0400148/*
149 * compute the csum for a btree block, and either verify it or write it
150 * into the csum field of the block.
151 */
Chris Mason19c00dd2007-10-15 16:19:22 -0400152static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
153 int verify)
154{
Josef Bacik607d4322008-12-02 07:17:45 -0500155 u16 csum_size =
156 btrfs_super_csum_size(&root->fs_info->super_copy);
157 char *result = NULL;
Chris Mason19c00dd2007-10-15 16:19:22 -0400158 unsigned long len;
159 unsigned long cur_len;
160 unsigned long offset = BTRFS_CSUM_SIZE;
161 char *map_token = NULL;
162 char *kaddr;
163 unsigned long map_start;
164 unsigned long map_len;
165 int err;
166 u32 crc = ~(u32)0;
Josef Bacik607d4322008-12-02 07:17:45 -0500167 unsigned long inline_result;
Chris Mason19c00dd2007-10-15 16:19:22 -0400168
169 len = buf->len - offset;
Chris Masond3977122009-01-05 21:25:51 -0500170 while (len > 0) {
Chris Mason19c00dd2007-10-15 16:19:22 -0400171 err = map_private_extent_buffer(buf, offset, 32,
172 &map_token, &kaddr,
173 &map_start, &map_len, KM_USER0);
Chris Masond3977122009-01-05 21:25:51 -0500174 if (err)
Chris Mason19c00dd2007-10-15 16:19:22 -0400175 return 1;
Chris Mason19c00dd2007-10-15 16:19:22 -0400176 cur_len = min(len, map_len - (offset - map_start));
177 crc = btrfs_csum_data(root, kaddr + offset - map_start,
178 crc, cur_len);
179 len -= cur_len;
180 offset += cur_len;
181 unmap_extent_buffer(buf, map_token, KM_USER0);
182 }
Josef Bacik607d4322008-12-02 07:17:45 -0500183 if (csum_size > sizeof(inline_result)) {
184 result = kzalloc(csum_size * sizeof(char), GFP_NOFS);
185 if (!result)
186 return 1;
187 } else {
188 result = (char *)&inline_result;
189 }
190
Chris Mason19c00dd2007-10-15 16:19:22 -0400191 btrfs_csum_final(crc, result);
192
193 if (verify) {
Josef Bacik607d4322008-12-02 07:17:45 -0500194 if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
Chris Masone4204de2008-01-08 15:46:27 -0500195 u32 val;
196 u32 found = 0;
Josef Bacik607d4322008-12-02 07:17:45 -0500197 memcpy(&found, result, csum_size);
Chris Masone4204de2008-01-08 15:46:27 -0500198
Josef Bacik607d4322008-12-02 07:17:45 -0500199 read_extent_buffer(buf, &val, 0, csum_size);
Chris Masond3977122009-01-05 21:25:51 -0500200 printk(KERN_INFO "btrfs: %s checksum verify failed "
201 "on %llu wanted %X found %X level %d\n",
Chris Mason19c00dd2007-10-15 16:19:22 -0400202 root->fs_info->sb->s_id,
Chris Mason2dd3e672008-08-04 08:20:15 -0400203 buf->start, val, found, btrfs_header_level(buf));
Josef Bacik607d4322008-12-02 07:17:45 -0500204 if (result != (char *)&inline_result)
205 kfree(result);
Chris Mason19c00dd2007-10-15 16:19:22 -0400206 return 1;
207 }
208 } else {
Josef Bacik607d4322008-12-02 07:17:45 -0500209 write_extent_buffer(buf, result, 0, csum_size);
Chris Mason19c00dd2007-10-15 16:19:22 -0400210 }
Josef Bacik607d4322008-12-02 07:17:45 -0500211 if (result != (char *)&inline_result)
212 kfree(result);
Chris Mason19c00dd2007-10-15 16:19:22 -0400213 return 0;
214}
215
Chris Masond352ac62008-09-29 15:18:18 -0400216/*
217 * we can't consider a given block up to date unless the transid of the
218 * block matches the transid in the parent node's pointer. This is how we
219 * detect blocks that either didn't get written at all or got written
220 * in the wrong place.
221 */
Chris Mason1259ab72008-05-12 13:39:03 -0400222static int verify_parent_transid(struct extent_io_tree *io_tree,
223 struct extent_buffer *eb, u64 parent_transid)
224{
225 int ret;
226
227 if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
228 return 0;
229
230 lock_extent(io_tree, eb->start, eb->start + eb->len - 1, GFP_NOFS);
231 if (extent_buffer_uptodate(io_tree, eb) &&
232 btrfs_header_generation(eb) == parent_transid) {
233 ret = 0;
234 goto out;
235 }
236 printk("parent transid verify failed on %llu wanted %llu found %llu\n",
237 (unsigned long long)eb->start,
238 (unsigned long long)parent_transid,
239 (unsigned long long)btrfs_header_generation(eb));
240 ret = 1;
Chris Mason1259ab72008-05-12 13:39:03 -0400241 clear_extent_buffer_uptodate(io_tree, eb);
Chris Mason33958dc2008-07-30 10:29:12 -0400242out:
Chris Mason1259ab72008-05-12 13:39:03 -0400243 unlock_extent(io_tree, eb->start, eb->start + eb->len - 1,
244 GFP_NOFS);
245 return ret;
Chris Mason1259ab72008-05-12 13:39:03 -0400246}
247
Chris Masond352ac62008-09-29 15:18:18 -0400248/*
249 * helper to read a given tree block, doing retries as required when
250 * the checksums don't match and we have alternate mirrors to try.
251 */
Chris Masonf1885912008-04-09 16:28:12 -0400252static int btree_read_extent_buffer_pages(struct btrfs_root *root,
253 struct extent_buffer *eb,
Chris Masonca7a79a2008-05-12 12:59:19 -0400254 u64 start, u64 parent_transid)
Chris Masonf1885912008-04-09 16:28:12 -0400255{
256 struct extent_io_tree *io_tree;
257 int ret;
258 int num_copies = 0;
259 int mirror_num = 0;
260
261 io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
262 while (1) {
263 ret = read_extent_buffer_pages(io_tree, eb, start, 1,
264 btree_get_extent, mirror_num);
Chris Mason1259ab72008-05-12 13:39:03 -0400265 if (!ret &&
266 !verify_parent_transid(io_tree, eb, parent_transid))
Chris Masonf1885912008-04-09 16:28:12 -0400267 return ret;
Chris Masond3977122009-01-05 21:25:51 -0500268
Chris Masonf1885912008-04-09 16:28:12 -0400269 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
270 eb->start, eb->len);
Chris Mason42352982008-04-28 16:40:52 -0400271 if (num_copies == 1)
Chris Masonf1885912008-04-09 16:28:12 -0400272 return ret;
Chris Mason42352982008-04-28 16:40:52 -0400273
Chris Masonf1885912008-04-09 16:28:12 -0400274 mirror_num++;
Chris Mason42352982008-04-28 16:40:52 -0400275 if (mirror_num > num_copies)
Chris Masonf1885912008-04-09 16:28:12 -0400276 return ret;
Chris Masonf1885912008-04-09 16:28:12 -0400277 }
Chris Masonf1885912008-04-09 16:28:12 -0400278 return -EIO;
279}
Chris Mason19c00dd2007-10-15 16:19:22 -0400280
Chris Masond352ac62008-09-29 15:18:18 -0400281/*
Chris Masond3977122009-01-05 21:25:51 -0500282 * checksum a dirty tree block before IO. This has extra checks to make sure
283 * we only fill in the checksum field in the first page of a multi-page block
Chris Masond352ac62008-09-29 15:18:18 -0400284 */
Chris Masond3977122009-01-05 21:25:51 -0500285
Christoph Hellwigb2950862008-12-02 09:54:17 -0500286static int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
Chris Mason19c00dd2007-10-15 16:19:22 -0400287{
Chris Masond1310b22008-01-24 16:13:08 -0500288 struct extent_io_tree *tree;
Chris Mason35ebb932007-10-30 16:56:53 -0400289 u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
Chris Mason19c00dd2007-10-15 16:19:22 -0400290 u64 found_start;
291 int found_level;
292 unsigned long len;
293 struct extent_buffer *eb;
Chris Masonf1885912008-04-09 16:28:12 -0400294 int ret;
295
Chris Masond1310b22008-01-24 16:13:08 -0500296 tree = &BTRFS_I(page->mapping->host)->io_tree;
Chris Mason19c00dd2007-10-15 16:19:22 -0400297
298 if (page->private == EXTENT_PAGE_PRIVATE)
299 goto out;
300 if (!page->private)
301 goto out;
302 len = page->private >> 2;
Chris Masond3977122009-01-05 21:25:51 -0500303 WARN_ON(len == 0);
304
Chris Mason19c00dd2007-10-15 16:19:22 -0400305 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
Chris Masonca7a79a2008-05-12 12:59:19 -0400306 ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE,
307 btrfs_header_generation(eb));
Chris Masonf1885912008-04-09 16:28:12 -0400308 BUG_ON(ret);
Chris Mason19c00dd2007-10-15 16:19:22 -0400309 found_start = btrfs_header_bytenr(eb);
310 if (found_start != start) {
Chris Mason55c69072008-01-09 15:55:33 -0500311 WARN_ON(1);
312 goto err;
313 }
314 if (eb->first_page != page) {
Chris Mason55c69072008-01-09 15:55:33 -0500315 WARN_ON(1);
316 goto err;
317 }
318 if (!PageUptodate(page)) {
Chris Mason55c69072008-01-09 15:55:33 -0500319 WARN_ON(1);
320 goto err;
Chris Mason19c00dd2007-10-15 16:19:22 -0400321 }
322 found_level = btrfs_header_level(eb);
Chris Mason4bef0842008-09-08 11:18:08 -0400323
Chris Mason19c00dd2007-10-15 16:19:22 -0400324 csum_tree_block(root, eb, 0);
Chris Mason55c69072008-01-09 15:55:33 -0500325err:
Chris Mason19c00dd2007-10-15 16:19:22 -0400326 free_extent_buffer(eb);
327out:
328 return 0;
329}
330
Yan Zheng2b820322008-11-17 21:11:30 -0500331static int check_tree_block_fsid(struct btrfs_root *root,
332 struct extent_buffer *eb)
333{
334 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
335 u8 fsid[BTRFS_UUID_SIZE];
336 int ret = 1;
337
338 read_extent_buffer(eb, fsid, (unsigned long)btrfs_header_fsid(eb),
339 BTRFS_FSID_SIZE);
340 while (fs_devices) {
341 if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) {
342 ret = 0;
343 break;
344 }
345 fs_devices = fs_devices->seed;
346 }
347 return ret;
348}
349
Christoph Hellwigb2950862008-12-02 09:54:17 -0500350static int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
Chris Masonce9adaa2008-04-09 16:28:12 -0400351 struct extent_state *state)
352{
353 struct extent_io_tree *tree;
354 u64 found_start;
355 int found_level;
356 unsigned long len;
357 struct extent_buffer *eb;
358 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
Chris Masonf1885912008-04-09 16:28:12 -0400359 int ret = 0;
Chris Masonce9adaa2008-04-09 16:28:12 -0400360
361 tree = &BTRFS_I(page->mapping->host)->io_tree;
362 if (page->private == EXTENT_PAGE_PRIVATE)
363 goto out;
364 if (!page->private)
365 goto out;
Chris Masond3977122009-01-05 21:25:51 -0500366
Chris Masonce9adaa2008-04-09 16:28:12 -0400367 len = page->private >> 2;
Chris Masond3977122009-01-05 21:25:51 -0500368 WARN_ON(len == 0);
369
Chris Masonce9adaa2008-04-09 16:28:12 -0400370 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
Chris Masonf1885912008-04-09 16:28:12 -0400371
Chris Masonce9adaa2008-04-09 16:28:12 -0400372 found_start = btrfs_header_bytenr(eb);
Chris Mason23a07862008-09-12 08:57:47 -0400373 if (found_start != start) {
Chris Masond3977122009-01-05 21:25:51 -0500374 printk(KERN_INFO "btrfs bad tree block start %llu %llu\n",
Chris Masona1b32a52008-09-05 16:09:51 -0400375 (unsigned long long)found_start,
376 (unsigned long long)eb->start);
Chris Masonf1885912008-04-09 16:28:12 -0400377 ret = -EIO;
Chris Masonce9adaa2008-04-09 16:28:12 -0400378 goto err;
379 }
380 if (eb->first_page != page) {
Chris Masond3977122009-01-05 21:25:51 -0500381 printk(KERN_INFO "btrfs bad first page %lu %lu\n",
382 eb->first_page->index, page->index);
Chris Masonce9adaa2008-04-09 16:28:12 -0400383 WARN_ON(1);
Chris Masonf1885912008-04-09 16:28:12 -0400384 ret = -EIO;
Chris Masonce9adaa2008-04-09 16:28:12 -0400385 goto err;
386 }
Yan Zheng2b820322008-11-17 21:11:30 -0500387 if (check_tree_block_fsid(root, eb)) {
Chris Masond3977122009-01-05 21:25:51 -0500388 printk(KERN_INFO "btrfs bad fsid on block %llu\n",
389 (unsigned long long)eb->start);
Chris Mason1259ab72008-05-12 13:39:03 -0400390 ret = -EIO;
391 goto err;
392 }
Chris Masonce9adaa2008-04-09 16:28:12 -0400393 found_level = btrfs_header_level(eb);
394
395 ret = csum_tree_block(root, eb, 1);
Chris Masonf1885912008-04-09 16:28:12 -0400396 if (ret)
397 ret = -EIO;
Chris Masonce9adaa2008-04-09 16:28:12 -0400398
399 end = min_t(u64, eb->len, PAGE_CACHE_SIZE);
400 end = eb->start + end - 1;
Chris Masonce9adaa2008-04-09 16:28:12 -0400401err:
402 free_extent_buffer(eb);
403out:
Chris Masonf1885912008-04-09 16:28:12 -0400404 return ret;
Chris Masonce9adaa2008-04-09 16:28:12 -0400405}
406
Chris Masonce9adaa2008-04-09 16:28:12 -0400407static void end_workqueue_bio(struct bio *bio, int err)
Chris Masonce9adaa2008-04-09 16:28:12 -0400408{
409 struct end_io_wq *end_io_wq = bio->bi_private;
410 struct btrfs_fs_info *fs_info;
Chris Masonce9adaa2008-04-09 16:28:12 -0400411
Chris Masonce9adaa2008-04-09 16:28:12 -0400412 fs_info = end_io_wq->info;
Chris Masonce9adaa2008-04-09 16:28:12 -0400413 end_io_wq->error = err;
Chris Mason8b712842008-06-11 16:50:36 -0400414 end_io_wq->work.func = end_workqueue_fn;
415 end_io_wq->work.flags = 0;
Chris Masond20f7042008-12-08 16:58:54 -0500416
417 if (bio->bi_rw & (1 << BIO_RW)) {
Chris Masoncad321a2008-12-17 14:51:42 -0500418 if (end_io_wq->metadata)
419 btrfs_queue_worker(&fs_info->endio_meta_write_workers,
420 &end_io_wq->work);
421 else
422 btrfs_queue_worker(&fs_info->endio_write_workers,
423 &end_io_wq->work);
Chris Masond20f7042008-12-08 16:58:54 -0500424 } else {
425 if (end_io_wq->metadata)
426 btrfs_queue_worker(&fs_info->endio_meta_workers,
427 &end_io_wq->work);
428 else
429 btrfs_queue_worker(&fs_info->endio_workers,
430 &end_io_wq->work);
431 }
Chris Masonce9adaa2008-04-09 16:28:12 -0400432}
433
Chris Mason22c59942008-04-09 16:28:12 -0400434int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
435 int metadata)
Chris Mason0b86a832008-03-24 15:01:56 -0400436{
Chris Masonce9adaa2008-04-09 16:28:12 -0400437 struct end_io_wq *end_io_wq;
Chris Masonce9adaa2008-04-09 16:28:12 -0400438 end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS);
439 if (!end_io_wq)
440 return -ENOMEM;
441
442 end_io_wq->private = bio->bi_private;
443 end_io_wq->end_io = bio->bi_end_io;
Chris Mason22c59942008-04-09 16:28:12 -0400444 end_io_wq->info = info;
Chris Masonce9adaa2008-04-09 16:28:12 -0400445 end_io_wq->error = 0;
446 end_io_wq->bio = bio;
Chris Mason22c59942008-04-09 16:28:12 -0400447 end_io_wq->metadata = metadata;
Chris Masonce9adaa2008-04-09 16:28:12 -0400448
449 bio->bi_private = end_io_wq;
450 bio->bi_end_io = end_workqueue_bio;
Chris Mason22c59942008-04-09 16:28:12 -0400451 return 0;
452}
453
Chris Masonb64a2852008-08-20 13:39:41 -0400454unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info)
Chris Mason4854ddd2008-08-15 15:34:17 -0400455{
456 unsigned long limit = min_t(unsigned long,
457 info->workers.max_workers,
458 info->fs_devices->open_devices);
459 return 256 * limit;
460}
461
Chris Mason777e6bd2008-08-15 15:34:15 -0400462int btrfs_congested_async(struct btrfs_fs_info *info, int iodone)
Chris Mason0986fe9e2008-08-15 15:34:15 -0400463{
Chris Masonb64a2852008-08-20 13:39:41 -0400464 return atomic_read(&info->nr_async_bios) >
465 btrfs_async_submit_limit(info);
Chris Mason0986fe9e2008-08-15 15:34:15 -0400466}
467
Chris Mason4a69a412008-11-06 22:03:00 -0500468static void run_one_async_start(struct btrfs_work *work)
469{
470 struct btrfs_fs_info *fs_info;
471 struct async_submit_bio *async;
472
473 async = container_of(work, struct async_submit_bio, work);
474 fs_info = BTRFS_I(async->inode)->root->fs_info;
475 async->submit_bio_start(async->inode, async->rw, async->bio,
476 async->mirror_num, async->bio_flags);
477}
478
479static void run_one_async_done(struct btrfs_work *work)
Chris Mason8b712842008-06-11 16:50:36 -0400480{
481 struct btrfs_fs_info *fs_info;
482 struct async_submit_bio *async;
Chris Mason4854ddd2008-08-15 15:34:17 -0400483 int limit;
Chris Mason8b712842008-06-11 16:50:36 -0400484
485 async = container_of(work, struct async_submit_bio, work);
486 fs_info = BTRFS_I(async->inode)->root->fs_info;
Chris Mason4854ddd2008-08-15 15:34:17 -0400487
Chris Masonb64a2852008-08-20 13:39:41 -0400488 limit = btrfs_async_submit_limit(fs_info);
Chris Mason4854ddd2008-08-15 15:34:17 -0400489 limit = limit * 2 / 3;
490
Chris Mason8b712842008-06-11 16:50:36 -0400491 atomic_dec(&fs_info->nr_async_submits);
Chris Mason0986fe9e2008-08-15 15:34:15 -0400492
Chris Masonb64a2852008-08-20 13:39:41 -0400493 if (atomic_read(&fs_info->nr_async_submits) < limit &&
494 waitqueue_active(&fs_info->async_submit_wait))
Chris Mason4854ddd2008-08-15 15:34:17 -0400495 wake_up(&fs_info->async_submit_wait);
496
Chris Mason4a69a412008-11-06 22:03:00 -0500497 async->submit_bio_done(async->inode, async->rw, async->bio,
Chris Masonc8b97812008-10-29 14:49:59 -0400498 async->mirror_num, async->bio_flags);
Chris Mason4a69a412008-11-06 22:03:00 -0500499}
500
501static void run_one_async_free(struct btrfs_work *work)
502{
503 struct async_submit_bio *async;
504
505 async = container_of(work, struct async_submit_bio, work);
Chris Mason8b712842008-06-11 16:50:36 -0400506 kfree(async);
507}
508
Chris Mason44b8bd72008-04-16 11:14:51 -0400509int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
510 int rw, struct bio *bio, int mirror_num,
Chris Masonc8b97812008-10-29 14:49:59 -0400511 unsigned long bio_flags,
Chris Mason4a69a412008-11-06 22:03:00 -0500512 extent_submit_bio_hook_t *submit_bio_start,
513 extent_submit_bio_hook_t *submit_bio_done)
Chris Mason44b8bd72008-04-16 11:14:51 -0400514{
515 struct async_submit_bio *async;
516
517 async = kmalloc(sizeof(*async), GFP_NOFS);
518 if (!async)
519 return -ENOMEM;
520
521 async->inode = inode;
522 async->rw = rw;
523 async->bio = bio;
524 async->mirror_num = mirror_num;
Chris Mason4a69a412008-11-06 22:03:00 -0500525 async->submit_bio_start = submit_bio_start;
526 async->submit_bio_done = submit_bio_done;
527
528 async->work.func = run_one_async_start;
529 async->work.ordered_func = run_one_async_done;
530 async->work.ordered_free = run_one_async_free;
531
Chris Mason8b712842008-06-11 16:50:36 -0400532 async->work.flags = 0;
Chris Masonc8b97812008-10-29 14:49:59 -0400533 async->bio_flags = bio_flags;
Chris Mason8c8bee12008-09-29 11:19:10 -0400534
Chris Masoncb03c742008-05-15 16:15:45 -0400535 atomic_inc(&fs_info->nr_async_submits);
Chris Mason8b712842008-06-11 16:50:36 -0400536 btrfs_queue_worker(&fs_info->workers, &async->work);
Chris Masond2c3f4f2008-11-19 12:44:22 -0500537#if 0
Chris Mason7c2ca462008-11-19 15:13:35 -0500538 int limit = btrfs_async_submit_limit(fs_info);
Chris Mason9473f162008-08-28 06:15:24 -0400539 if (atomic_read(&fs_info->nr_async_submits) > limit) {
540 wait_event_timeout(fs_info->async_submit_wait,
Chris Mason4854ddd2008-08-15 15:34:17 -0400541 (atomic_read(&fs_info->nr_async_submits) < limit),
542 HZ/10);
Chris Mason9473f162008-08-28 06:15:24 -0400543
544 wait_event_timeout(fs_info->async_submit_wait,
545 (atomic_read(&fs_info->nr_async_bios) < limit),
546 HZ/10);
547 }
Chris Masond2c3f4f2008-11-19 12:44:22 -0500548#endif
Chris Masond3977122009-01-05 21:25:51 -0500549 while (atomic_read(&fs_info->async_submit_draining) &&
Chris Mason771ed682008-11-06 22:02:51 -0500550 atomic_read(&fs_info->nr_async_submits)) {
551 wait_event(fs_info->async_submit_wait,
552 (atomic_read(&fs_info->nr_async_submits) == 0));
553 }
554
Chris Mason44b8bd72008-04-16 11:14:51 -0400555 return 0;
556}
557
Chris Masonce3ed712008-09-23 13:14:12 -0400558static int btree_csum_one_bio(struct bio *bio)
559{
560 struct bio_vec *bvec = bio->bi_io_vec;
561 int bio_index = 0;
562 struct btrfs_root *root;
563
564 WARN_ON(bio->bi_vcnt <= 0);
Chris Masond3977122009-01-05 21:25:51 -0500565 while (bio_index < bio->bi_vcnt) {
Chris Masonce3ed712008-09-23 13:14:12 -0400566 root = BTRFS_I(bvec->bv_page->mapping->host)->root;
567 csum_dirty_buffer(root, bvec->bv_page);
568 bio_index++;
569 bvec++;
570 }
571 return 0;
572}
573
Chris Mason4a69a412008-11-06 22:03:00 -0500574static int __btree_submit_bio_start(struct inode *inode, int rw,
575 struct bio *bio, int mirror_num,
576 unsigned long bio_flags)
Chris Mason22c59942008-04-09 16:28:12 -0400577{
Chris Mason8b712842008-06-11 16:50:36 -0400578 /*
579 * when we're called for a write, we're already in the async
Chris Mason5443be42008-08-15 15:34:16 -0400580 * submission context. Just jump into btrfs_map_bio
Chris Mason8b712842008-06-11 16:50:36 -0400581 */
Chris Mason4a69a412008-11-06 22:03:00 -0500582 btree_csum_one_bio(bio);
583 return 0;
584}
Chris Mason22c59942008-04-09 16:28:12 -0400585
Chris Mason4a69a412008-11-06 22:03:00 -0500586static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio,
587 int mirror_num, unsigned long bio_flags)
588{
Chris Mason8b712842008-06-11 16:50:36 -0400589 /*
Chris Mason4a69a412008-11-06 22:03:00 -0500590 * when we're called for a write, we're already in the async
591 * submission context. Just jump into btrfs_map_bio
Chris Mason8b712842008-06-11 16:50:36 -0400592 */
Chris Mason8b712842008-06-11 16:50:36 -0400593 return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1);
Chris Mason0b86a832008-03-24 15:01:56 -0400594}
595
Chris Mason44b8bd72008-04-16 11:14:51 -0400596static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
Chris Masonc8b97812008-10-29 14:49:59 -0400597 int mirror_num, unsigned long bio_flags)
Chris Mason44b8bd72008-04-16 11:14:51 -0400598{
Chris Masoncad321a2008-12-17 14:51:42 -0500599 int ret;
600
601 ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info,
602 bio, 1);
603 BUG_ON(ret);
604
Chris Mason44b8bd72008-04-16 11:14:51 -0400605 if (!(rw & (1 << BIO_RW))) {
Chris Mason4a69a412008-11-06 22:03:00 -0500606 /*
607 * called for a read, do the setup so that checksum validation
608 * can happen in the async kernel threads
609 */
Chris Mason4a69a412008-11-06 22:03:00 -0500610 return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio,
Chris Mason6f3577b2008-11-13 09:59:36 -0500611 mirror_num, 0);
Chris Mason44b8bd72008-04-16 11:14:51 -0400612 }
Chris Masoncad321a2008-12-17 14:51:42 -0500613 /*
614 * kthread helpers are used to submit writes so that checksumming
615 * can happen in parallel across all CPUs
616 */
Chris Mason44b8bd72008-04-16 11:14:51 -0400617 return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
Chris Masonc8b97812008-10-29 14:49:59 -0400618 inode, rw, bio, mirror_num, 0,
Chris Mason4a69a412008-11-06 22:03:00 -0500619 __btree_submit_bio_start,
620 __btree_submit_bio_done);
Chris Mason44b8bd72008-04-16 11:14:51 -0400621}
622
Chris Mason5f39d392007-10-15 16:14:19 -0400623static int btree_writepage(struct page *page, struct writeback_control *wbc)
624{
Chris Masond1310b22008-01-24 16:13:08 -0500625 struct extent_io_tree *tree;
626 tree = &BTRFS_I(page->mapping->host)->io_tree;
Chris Mason5443be42008-08-15 15:34:16 -0400627
628 if (current->flags & PF_MEMALLOC) {
629 redirty_page_for_writepage(wbc, page);
630 unlock_page(page);
631 return 0;
632 }
Chris Mason5f39d392007-10-15 16:14:19 -0400633 return extent_write_full_page(tree, page, btree_get_extent, wbc);
634}
Chris Mason0da54682007-11-07 21:08:01 -0500635
636static int btree_writepages(struct address_space *mapping,
637 struct writeback_control *wbc)
638{
Chris Masond1310b22008-01-24 16:13:08 -0500639 struct extent_io_tree *tree;
640 tree = &BTRFS_I(mapping->host)->io_tree;
Chris Masond8d5f3e2007-12-11 12:42:00 -0500641 if (wbc->sync_mode == WB_SYNC_NONE) {
Chris Mason793955b2007-11-26 16:34:41 -0800642 u64 num_dirty;
643 u64 start = 0;
Chris Mason24ab9cd2008-09-24 14:51:30 -0400644 unsigned long thresh = 32 * 1024 * 1024;
Chris Mason448d6402007-11-27 07:52:01 -0800645
646 if (wbc->for_kupdate)
647 return 0;
648
Chris Mason1832a6d2007-12-21 16:27:21 -0500649 num_dirty = count_range_bits(tree, &start, (u64)-1,
650 thresh, EXTENT_DIRTY);
Chris Masond3977122009-01-05 21:25:51 -0500651 if (num_dirty < thresh)
Chris Mason793955b2007-11-26 16:34:41 -0800652 return 0;
Chris Mason793955b2007-11-26 16:34:41 -0800653 }
Chris Mason0da54682007-11-07 21:08:01 -0500654 return extent_writepages(tree, mapping, btree_get_extent, wbc);
655}
656
Christoph Hellwigb2950862008-12-02 09:54:17 -0500657static int btree_readpage(struct file *file, struct page *page)
Chris Mason5f39d392007-10-15 16:14:19 -0400658{
Chris Masond1310b22008-01-24 16:13:08 -0500659 struct extent_io_tree *tree;
660 tree = &BTRFS_I(page->mapping->host)->io_tree;
Chris Mason5f39d392007-10-15 16:14:19 -0400661 return extent_read_full_page(tree, page, btree_get_extent);
662}
663
Chris Mason70dec802008-01-29 09:59:12 -0500664static int btree_releasepage(struct page *page, gfp_t gfp_flags)
Chris Mason5f39d392007-10-15 16:14:19 -0400665{
Chris Masond1310b22008-01-24 16:13:08 -0500666 struct extent_io_tree *tree;
667 struct extent_map_tree *map;
Chris Mason5f39d392007-10-15 16:14:19 -0400668 int ret;
669
Chris Mason98509cf2008-09-11 15:51:43 -0400670 if (PageWriteback(page) || PageDirty(page))
Chris Masond3977122009-01-05 21:25:51 -0500671 return 0;
Chris Mason98509cf2008-09-11 15:51:43 -0400672
Chris Masond1310b22008-01-24 16:13:08 -0500673 tree = &BTRFS_I(page->mapping->host)->io_tree;
674 map = &BTRFS_I(page->mapping->host)->extent_tree;
Chris Mason6af118ce2008-07-22 11:18:07 -0400675
Chris Mason7b13b7b2008-04-18 10:29:50 -0400676 ret = try_release_extent_state(map, tree, page, gfp_flags);
Chris Masond3977122009-01-05 21:25:51 -0500677 if (!ret)
Chris Mason6af118ce2008-07-22 11:18:07 -0400678 return 0;
Chris Mason6af118ce2008-07-22 11:18:07 -0400679
680 ret = try_release_extent_buffer(tree, page);
Chris Mason5f39d392007-10-15 16:14:19 -0400681 if (ret == 1) {
682 ClearPagePrivate(page);
683 set_page_private(page, 0);
684 page_cache_release(page);
685 }
Chris Mason6af118ce2008-07-22 11:18:07 -0400686
Chris Masond98237b2007-03-28 13:57:48 -0400687 return ret;
Chris Masone20d96d2007-03-22 12:13:20 -0400688}
Chris Mason123abc82007-03-14 14:14:43 -0400689
Chris Mason5f39d392007-10-15 16:14:19 -0400690static void btree_invalidatepage(struct page *page, unsigned long offset)
Chris Masond98237b2007-03-28 13:57:48 -0400691{
Chris Masond1310b22008-01-24 16:13:08 -0500692 struct extent_io_tree *tree;
693 tree = &BTRFS_I(page->mapping->host)->io_tree;
Chris Mason5f39d392007-10-15 16:14:19 -0400694 extent_invalidatepage(tree, page, offset);
695 btree_releasepage(page, GFP_NOFS);
Chris Mason9ad6b7b2008-04-18 16:11:30 -0400696 if (PagePrivate(page)) {
Chris Masond3977122009-01-05 21:25:51 -0500697 printk(KERN_WARNING "btrfs warning page private not zero "
698 "on page %llu\n", (unsigned long long)page_offset(page));
Chris Mason9ad6b7b2008-04-18 16:11:30 -0400699 ClearPagePrivate(page);
700 set_page_private(page, 0);
701 page_cache_release(page);
702 }
Chris Masond98237b2007-03-28 13:57:48 -0400703}
704
Chris Mason5f39d392007-10-15 16:14:19 -0400705#if 0
Chris Masond98237b2007-03-28 13:57:48 -0400706static int btree_writepage(struct page *page, struct writeback_control *wbc)
707{
Chris Mason87cbda52007-03-28 19:44:27 -0400708 struct buffer_head *bh;
Chris Mason0f7d52f2007-04-09 10:42:37 -0400709 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
Chris Mason87cbda52007-03-28 19:44:27 -0400710 struct buffer_head *head;
Chris Mason87cbda52007-03-28 19:44:27 -0400711 if (!page_has_buffers(page)) {
712 create_empty_buffers(page, root->fs_info->sb->s_blocksize,
713 (1 << BH_Dirty)|(1 << BH_Uptodate));
714 }
715 head = page_buffers(page);
716 bh = head;
717 do {
718 if (buffer_dirty(bh))
719 csum_tree_block(root, bh, 0);
720 bh = bh->b_this_page;
721 } while (bh != head);
Chris Masond98237b2007-03-28 13:57:48 -0400722 return block_write_full_page(page, btree_get_block, wbc);
723}
Chris Mason5f39d392007-10-15 16:14:19 -0400724#endif
Chris Masond98237b2007-03-28 13:57:48 -0400725
726static struct address_space_operations btree_aops = {
727 .readpage = btree_readpage,
728 .writepage = btree_writepage,
Chris Mason0da54682007-11-07 21:08:01 -0500729 .writepages = btree_writepages,
Chris Mason5f39d392007-10-15 16:14:19 -0400730 .releasepage = btree_releasepage,
731 .invalidatepage = btree_invalidatepage,
Chris Masond98237b2007-03-28 13:57:48 -0400732 .sync_page = block_sync_page,
733};
734
Chris Masonca7a79a2008-05-12 12:59:19 -0400735int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
736 u64 parent_transid)
Chris Mason090d1872007-05-01 08:53:32 -0400737{
Chris Mason5f39d392007-10-15 16:14:19 -0400738 struct extent_buffer *buf = NULL;
739 struct inode *btree_inode = root->fs_info->btree_inode;
Chris Masonde428b62007-05-18 13:28:27 -0400740 int ret = 0;
Chris Mason090d1872007-05-01 08:53:32 -0400741
Chris Masondb945352007-10-15 16:15:53 -0400742 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
Chris Mason5f39d392007-10-15 16:14:19 -0400743 if (!buf)
Chris Mason090d1872007-05-01 08:53:32 -0400744 return 0;
Chris Masond1310b22008-01-24 16:13:08 -0500745 read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
Chris Masonf1885912008-04-09 16:28:12 -0400746 buf, 0, 0, btree_get_extent, 0);
Chris Mason5f39d392007-10-15 16:14:19 -0400747 free_extent_buffer(buf);
Chris Masonde428b62007-05-18 13:28:27 -0400748 return ret;
Chris Mason090d1872007-05-01 08:53:32 -0400749}
750
Chris Mason0999df52008-04-01 13:48:14 -0400751struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
752 u64 bytenr, u32 blocksize)
753{
754 struct inode *btree_inode = root->fs_info->btree_inode;
755 struct extent_buffer *eb;
756 eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
757 bytenr, blocksize, GFP_NOFS);
758 return eb;
759}
760
761struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
762 u64 bytenr, u32 blocksize)
763{
764 struct inode *btree_inode = root->fs_info->btree_inode;
765 struct extent_buffer *eb;
766
767 eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
768 bytenr, blocksize, NULL, GFP_NOFS);
769 return eb;
770}
771
772
Chris Masone02119d2008-09-05 16:13:11 -0400773int btrfs_write_tree_block(struct extent_buffer *buf)
774{
775 return btrfs_fdatawrite_range(buf->first_page->mapping, buf->start,
Chris Mason24ab9cd2008-09-24 14:51:30 -0400776 buf->start + buf->len - 1, WB_SYNC_ALL);
Chris Masone02119d2008-09-05 16:13:11 -0400777}
778
779int btrfs_wait_tree_block_writeback(struct extent_buffer *buf)
780{
781 return btrfs_wait_on_page_writeback_range(buf->first_page->mapping,
Chris Masond3977122009-01-05 21:25:51 -0500782 buf->start, buf->start + buf->len - 1);
Chris Masone02119d2008-09-05 16:13:11 -0400783}
784
Chris Masondb945352007-10-15 16:15:53 -0400785struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
Chris Masonca7a79a2008-05-12 12:59:19 -0400786 u32 blocksize, u64 parent_transid)
Chris Masone20d96d2007-03-22 12:13:20 -0400787{
Chris Mason5f39d392007-10-15 16:14:19 -0400788 struct extent_buffer *buf = NULL;
789 struct inode *btree_inode = root->fs_info->btree_inode;
Chris Masond1310b22008-01-24 16:13:08 -0500790 struct extent_io_tree *io_tree;
Chris Mason19c00dd2007-10-15 16:19:22 -0400791 int ret;
792
Chris Masond1310b22008-01-24 16:13:08 -0500793 io_tree = &BTRFS_I(btree_inode)->io_tree;
Chris Masone20d96d2007-03-22 12:13:20 -0400794
Chris Masondb945352007-10-15 16:15:53 -0400795 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
Chris Mason5f39d392007-10-15 16:14:19 -0400796 if (!buf)
797 return NULL;
Chris Masone4204de2008-01-08 15:46:27 -0500798
Chris Masonca7a79a2008-05-12 12:59:19 -0400799 ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
Chris Masonce9adaa2008-04-09 16:28:12 -0400800
Chris Masond3977122009-01-05 21:25:51 -0500801 if (ret == 0)
Chris Masonce9adaa2008-04-09 16:28:12 -0400802 buf->flags |= EXTENT_UPTODATE;
Chris Masond3977122009-01-05 21:25:51 -0500803 else
Chris Masona1b32a52008-09-05 16:09:51 -0400804 WARN_ON(1);
Chris Mason5f39d392007-10-15 16:14:19 -0400805 return buf;
Chris Masonce9adaa2008-04-09 16:28:12 -0400806
Chris Masoneb60cea2007-02-02 09:18:22 -0500807}
808
Chris Masone089f052007-03-16 16:20:31 -0400809int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
Chris Mason5f39d392007-10-15 16:14:19 -0400810 struct extent_buffer *buf)
Chris Masoned2ff2c2007-03-01 18:59:40 -0500811{
Chris Mason5f39d392007-10-15 16:14:19 -0400812 struct inode *btree_inode = root->fs_info->btree_inode;
Chris Mason55c69072008-01-09 15:55:33 -0500813 if (btrfs_header_generation(buf) ==
Chris Mason925baed2008-06-25 16:01:30 -0400814 root->fs_info->running_transaction->transid) {
815 WARN_ON(!btrfs_tree_locked(buf));
Chris Masond1310b22008-01-24 16:13:08 -0500816 clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
Chris Mason55c69072008-01-09 15:55:33 -0500817 buf);
Chris Mason925baed2008-06-25 16:01:30 -0400818 }
Chris Mason5f39d392007-10-15 16:14:19 -0400819 return 0;
820}
821
Chris Masondb945352007-10-15 16:15:53 -0400822static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
Chris Mason87ee04e2007-11-30 11:30:34 -0500823 u32 stripesize, struct btrfs_root *root,
Chris Mason9f5fae22007-03-20 14:38:32 -0400824 struct btrfs_fs_info *fs_info,
Chris Masone20d96d2007-03-22 12:13:20 -0400825 u64 objectid)
Chris Masond97e63b2007-02-20 16:40:44 -0500826{
Chris Masoncfaa7292007-02-21 17:04:57 -0500827 root->node = NULL;
Chris Masona28ec192007-03-06 20:08:01 -0500828 root->commit_root = NULL;
Yan Zheng31153d82008-07-28 15:32:19 -0400829 root->ref_tree = NULL;
Chris Masondb945352007-10-15 16:15:53 -0400830 root->sectorsize = sectorsize;
831 root->nodesize = nodesize;
832 root->leafsize = leafsize;
Chris Mason87ee04e2007-11-30 11:30:34 -0500833 root->stripesize = stripesize;
Chris Mason123abc82007-03-14 14:14:43 -0400834 root->ref_cows = 0;
Chris Mason0b86a832008-03-24 15:01:56 -0400835 root->track_dirty = 0;
836
Chris Mason9f5fae22007-03-20 14:38:32 -0400837 root->fs_info = fs_info;
Chris Mason0f7d52f2007-04-09 10:42:37 -0400838 root->objectid = objectid;
839 root->last_trans = 0;
Chris Mason1b05da22007-04-10 12:13:09 -0400840 root->highest_inode = 0;
841 root->last_inode_alloc = 0;
Josef Bacik58176a92007-08-29 15:47:34 -0400842 root->name = NULL;
Chris Mason4313b392008-01-03 09:08:48 -0500843 root->in_sysfs = 0;
Chris Mason0b86a832008-03-24 15:01:56 -0400844
845 INIT_LIST_HEAD(&root->dirty_list);
Josef Bacik7b128762008-07-24 12:17:14 -0400846 INIT_LIST_HEAD(&root->orphan_list);
Yanbcc63ab2008-07-30 16:29:20 -0400847 INIT_LIST_HEAD(&root->dead_list);
Chris Mason925baed2008-06-25 16:01:30 -0400848 spin_lock_init(&root->node_lock);
Yanbcc63ab2008-07-30 16:29:20 -0400849 spin_lock_init(&root->list_lock);
Chris Masona2135012008-06-25 16:01:30 -0400850 mutex_init(&root->objectid_mutex);
Chris Masone02119d2008-09-05 16:13:11 -0400851 mutex_init(&root->log_mutex);
Chris Masond0c803c2008-09-11 16:17:57 -0400852 extent_io_tree_init(&root->dirty_log_pages,
853 fs_info->btree_inode->i_mapping, GFP_NOFS);
Chris Mason017e5362008-07-28 15:32:51 -0400854
855 btrfs_leaf_ref_tree_init(&root->ref_tree_struct);
856 root->ref_tree = &root->ref_tree_struct;
857
Chris Mason3768f362007-03-13 16:47:54 -0400858 memset(&root->root_key, 0, sizeof(root->root_key));
859 memset(&root->root_item, 0, sizeof(root->root_item));
Chris Mason6702ed42007-08-07 16:15:09 -0400860 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
Josef Bacik58176a92007-08-29 15:47:34 -0400861 memset(&root->root_kobj, 0, sizeof(root->root_kobj));
Chris Mason3f157a22008-06-25 16:01:31 -0400862 root->defrag_trans_start = fs_info->generation;
Josef Bacik58176a92007-08-29 15:47:34 -0400863 init_completion(&root->kobj_unregister);
Chris Mason6702ed42007-08-07 16:15:09 -0400864 root->defrag_running = 0;
865 root->defrag_level = 0;
Chris Mason4d775672007-04-20 20:23:12 -0400866 root->root_key.objectid = objectid;
Chris Mason3394e162008-11-17 20:42:26 -0500867 root->anon_super.s_root = NULL;
868 root->anon_super.s_dev = 0;
869 INIT_LIST_HEAD(&root->anon_super.s_list);
870 INIT_LIST_HEAD(&root->anon_super.s_instances);
871 init_rwsem(&root->anon_super.s_umount);
872
Chris Mason3768f362007-03-13 16:47:54 -0400873 return 0;
874}
875
Chris Masondb945352007-10-15 16:15:53 -0400876static int find_and_setup_root(struct btrfs_root *tree_root,
Chris Mason9f5fae22007-03-20 14:38:32 -0400877 struct btrfs_fs_info *fs_info,
878 u64 objectid,
Chris Masone20d96d2007-03-22 12:13:20 -0400879 struct btrfs_root *root)
Chris Mason3768f362007-03-13 16:47:54 -0400880{
881 int ret;
Chris Masondb945352007-10-15 16:15:53 -0400882 u32 blocksize;
Yan Zheng84234f32008-10-29 14:49:05 -0400883 u64 generation;
Chris Mason3768f362007-03-13 16:47:54 -0400884
Chris Masondb945352007-10-15 16:15:53 -0400885 __setup_root(tree_root->nodesize, tree_root->leafsize,
Chris Mason87ee04e2007-11-30 11:30:34 -0500886 tree_root->sectorsize, tree_root->stripesize,
887 root, fs_info, objectid);
Chris Mason3768f362007-03-13 16:47:54 -0400888 ret = btrfs_find_last_root(tree_root, objectid,
889 &root->root_item, &root->root_key);
890 BUG_ON(ret);
891
Yan Zheng84234f32008-10-29 14:49:05 -0400892 generation = btrfs_root_generation(&root->root_item);
Chris Masondb945352007-10-15 16:15:53 -0400893 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
894 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
Yan Zheng84234f32008-10-29 14:49:05 -0400895 blocksize, generation);
Chris Mason3768f362007-03-13 16:47:54 -0400896 BUG_ON(!root->node);
Chris Masond97e63b2007-02-20 16:40:44 -0500897 return 0;
898}
899
Chris Masone02119d2008-09-05 16:13:11 -0400900int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans,
901 struct btrfs_fs_info *fs_info)
902{
903 struct extent_buffer *eb;
Chris Masond0c803c2008-09-11 16:17:57 -0400904 struct btrfs_root *log_root_tree = fs_info->log_root_tree;
905 u64 start = 0;
906 u64 end = 0;
Chris Masone02119d2008-09-05 16:13:11 -0400907 int ret;
908
Chris Masond0c803c2008-09-11 16:17:57 -0400909 if (!log_root_tree)
Chris Masone02119d2008-09-05 16:13:11 -0400910 return 0;
911
Chris Masond3977122009-01-05 21:25:51 -0500912 while (1) {
Chris Masond0c803c2008-09-11 16:17:57 -0400913 ret = find_first_extent_bit(&log_root_tree->dirty_log_pages,
914 0, &start, &end, EXTENT_DIRTY);
915 if (ret)
916 break;
917
918 clear_extent_dirty(&log_root_tree->dirty_log_pages,
919 start, end, GFP_NOFS);
920 }
Chris Masone02119d2008-09-05 16:13:11 -0400921 eb = fs_info->log_root_tree->node;
922
923 WARN_ON(btrfs_header_level(eb) != 0);
924 WARN_ON(btrfs_header_nritems(eb) != 0);
925
Chris Masond00aff02008-09-11 15:54:42 -0400926 ret = btrfs_free_reserved_extent(fs_info->tree_root,
927 eb->start, eb->len);
Chris Masone02119d2008-09-05 16:13:11 -0400928 BUG_ON(ret);
929
930 free_extent_buffer(eb);
931 kfree(fs_info->log_root_tree);
932 fs_info->log_root_tree = NULL;
933 return 0;
934}
935
936int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
937 struct btrfs_fs_info *fs_info)
Chris Mason0f7d52f2007-04-09 10:42:37 -0400938{
939 struct btrfs_root *root;
940 struct btrfs_root *tree_root = fs_info->tree_root;
Chris Masone02119d2008-09-05 16:13:11 -0400941
942 root = kzalloc(sizeof(*root), GFP_NOFS);
943 if (!root)
944 return -ENOMEM;
945
946 __setup_root(tree_root->nodesize, tree_root->leafsize,
947 tree_root->sectorsize, tree_root->stripesize,
948 root, fs_info, BTRFS_TREE_LOG_OBJECTID);
949
950 root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
951 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
952 root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
953 root->ref_cows = 0;
954
955 root->node = btrfs_alloc_free_block(trans, root, root->leafsize,
Zheng Yan31840ae2008-09-23 13:14:14 -0400956 0, BTRFS_TREE_LOG_OBJECTID,
957 trans->transid, 0, 0, 0);
Chris Masone02119d2008-09-05 16:13:11 -0400958
959 btrfs_set_header_nritems(root->node, 0);
960 btrfs_set_header_level(root->node, 0);
961 btrfs_set_header_bytenr(root->node, root->node->start);
962 btrfs_set_header_generation(root->node, trans->transid);
963 btrfs_set_header_owner(root->node, BTRFS_TREE_LOG_OBJECTID);
964
965 write_extent_buffer(root->node, root->fs_info->fsid,
966 (unsigned long)btrfs_header_fsid(root->node),
967 BTRFS_FSID_SIZE);
968 btrfs_mark_buffer_dirty(root->node);
969 btrfs_tree_unlock(root->node);
970 fs_info->log_root_tree = root;
971 return 0;
972}
973
974struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
975 struct btrfs_key *location)
976{
977 struct btrfs_root *root;
978 struct btrfs_fs_info *fs_info = tree_root->fs_info;
Chris Mason0f7d52f2007-04-09 10:42:37 -0400979 struct btrfs_path *path;
Chris Mason5f39d392007-10-15 16:14:19 -0400980 struct extent_buffer *l;
Chris Mason1b05da22007-04-10 12:13:09 -0400981 u64 highest_inode;
Yan Zheng84234f32008-10-29 14:49:05 -0400982 u64 generation;
Chris Masondb945352007-10-15 16:15:53 -0400983 u32 blocksize;
Chris Mason0f7d52f2007-04-09 10:42:37 -0400984 int ret = 0;
985
Chris Mason5eda7b52007-06-22 14:16:25 -0400986 root = kzalloc(sizeof(*root), GFP_NOFS);
Chris Mason0cf6c622007-06-09 09:22:25 -0400987 if (!root)
Chris Mason0f7d52f2007-04-09 10:42:37 -0400988 return ERR_PTR(-ENOMEM);
Chris Mason0f7d52f2007-04-09 10:42:37 -0400989 if (location->offset == (u64)-1) {
Chris Masondb945352007-10-15 16:15:53 -0400990 ret = find_and_setup_root(tree_root, fs_info,
Chris Mason0f7d52f2007-04-09 10:42:37 -0400991 location->objectid, root);
992 if (ret) {
Chris Mason0f7d52f2007-04-09 10:42:37 -0400993 kfree(root);
994 return ERR_PTR(ret);
995 }
996 goto insert;
997 }
998
Chris Masondb945352007-10-15 16:15:53 -0400999 __setup_root(tree_root->nodesize, tree_root->leafsize,
Chris Mason87ee04e2007-11-30 11:30:34 -05001000 tree_root->sectorsize, tree_root->stripesize,
1001 root, fs_info, location->objectid);
Chris Mason0f7d52f2007-04-09 10:42:37 -04001002
1003 path = btrfs_alloc_path();
1004 BUG_ON(!path);
1005 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
1006 if (ret != 0) {
Chris Mason0f7d52f2007-04-09 10:42:37 -04001007 if (ret > 0)
1008 ret = -ENOENT;
1009 goto out;
1010 }
Chris Mason5f39d392007-10-15 16:14:19 -04001011 l = path->nodes[0];
1012 read_extent_buffer(l, &root->root_item,
1013 btrfs_item_ptr_offset(l, path->slots[0]),
Chris Mason0f7d52f2007-04-09 10:42:37 -04001014 sizeof(root->root_item));
Yan Zheng44b36eb2007-10-19 09:22:56 -04001015 memcpy(&root->root_key, location, sizeof(*location));
Chris Mason0f7d52f2007-04-09 10:42:37 -04001016 ret = 0;
1017out:
1018 btrfs_release_path(root, path);
1019 btrfs_free_path(path);
1020 if (ret) {
1021 kfree(root);
1022 return ERR_PTR(ret);
1023 }
Yan Zheng84234f32008-10-29 14:49:05 -04001024 generation = btrfs_root_generation(&root->root_item);
Chris Masondb945352007-10-15 16:15:53 -04001025 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
1026 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
Yan Zheng84234f32008-10-29 14:49:05 -04001027 blocksize, generation);
Chris Mason0f7d52f2007-04-09 10:42:37 -04001028 BUG_ON(!root->node);
1029insert:
Chris Masone02119d2008-09-05 16:13:11 -04001030 if (location->objectid != BTRFS_TREE_LOG_OBJECTID) {
1031 root->ref_cows = 1;
1032 ret = btrfs_find_highest_inode(root, &highest_inode);
1033 if (ret == 0) {
1034 root->highest_inode = highest_inode;
1035 root->last_inode_alloc = highest_inode;
1036 }
Chris Mason5eda7b52007-06-22 14:16:25 -04001037 }
1038 return root;
1039}
1040
Chris Masondc17ff82008-01-08 15:46:30 -05001041struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
1042 u64 root_objectid)
1043{
1044 struct btrfs_root *root;
1045
1046 if (root_objectid == BTRFS_ROOT_TREE_OBJECTID)
1047 return fs_info->tree_root;
1048 if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID)
1049 return fs_info->extent_root;
1050
1051 root = radix_tree_lookup(&fs_info->fs_roots_radix,
1052 (unsigned long)root_objectid);
1053 return root;
1054}
1055
Chris Masonedbd8d42007-12-21 16:27:24 -05001056struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
1057 struct btrfs_key *location)
Chris Mason5eda7b52007-06-22 14:16:25 -04001058{
1059 struct btrfs_root *root;
1060 int ret;
1061
Chris Masonedbd8d42007-12-21 16:27:24 -05001062 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1063 return fs_info->tree_root;
1064 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
1065 return fs_info->extent_root;
Chris Mason8f18cf12008-04-25 16:53:30 -04001066 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
1067 return fs_info->chunk_root;
1068 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
1069 return fs_info->dev_root;
Yan Zheng0403e472008-12-10 20:32:51 -05001070 if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
1071 return fs_info->csum_root;
Chris Masonedbd8d42007-12-21 16:27:24 -05001072
Chris Mason5eda7b52007-06-22 14:16:25 -04001073 root = radix_tree_lookup(&fs_info->fs_roots_radix,
1074 (unsigned long)location->objectid);
1075 if (root)
1076 return root;
1077
Chris Masone02119d2008-09-05 16:13:11 -04001078 root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location);
Chris Mason5eda7b52007-06-22 14:16:25 -04001079 if (IS_ERR(root))
1080 return root;
Chris Mason3394e162008-11-17 20:42:26 -05001081
1082 set_anon_super(&root->anon_super, NULL);
1083
Chris Mason2619ba12007-04-10 16:58:11 -04001084 ret = radix_tree_insert(&fs_info->fs_roots_radix,
1085 (unsigned long)root->root_key.objectid,
Chris Mason0f7d52f2007-04-09 10:42:37 -04001086 root);
1087 if (ret) {
Chris Mason5f39d392007-10-15 16:14:19 -04001088 free_extent_buffer(root->node);
Chris Mason0f7d52f2007-04-09 10:42:37 -04001089 kfree(root);
1090 return ERR_PTR(ret);
1091 }
Yan Zhengc146afa2008-11-12 14:34:12 -05001092 if (!(fs_info->sb->s_flags & MS_RDONLY)) {
1093 ret = btrfs_find_dead_roots(fs_info->tree_root,
1094 root->root_key.objectid, root);
1095 BUG_ON(ret);
1096 btrfs_orphan_cleanup(root);
1097 }
Chris Masonedbd8d42007-12-21 16:27:24 -05001098 return root;
1099}
1100
1101struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
1102 struct btrfs_key *location,
1103 const char *name, int namelen)
1104{
1105 struct btrfs_root *root;
1106 int ret;
1107
1108 root = btrfs_read_fs_root_no_name(fs_info, location);
1109 if (!root)
1110 return NULL;
Josef Bacik58176a92007-08-29 15:47:34 -04001111
Chris Mason4313b392008-01-03 09:08:48 -05001112 if (root->in_sysfs)
1113 return root;
1114
Josef Bacik58176a92007-08-29 15:47:34 -04001115 ret = btrfs_set_root_name(root, name, namelen);
1116 if (ret) {
Chris Mason5f39d392007-10-15 16:14:19 -04001117 free_extent_buffer(root->node);
Josef Bacik58176a92007-08-29 15:47:34 -04001118 kfree(root);
1119 return ERR_PTR(ret);
1120 }
Chris Masonea9e8b12008-11-17 21:14:24 -05001121#if 0
Josef Bacik58176a92007-08-29 15:47:34 -04001122 ret = btrfs_sysfs_add_root(root);
1123 if (ret) {
Chris Mason5f39d392007-10-15 16:14:19 -04001124 free_extent_buffer(root->node);
Josef Bacik58176a92007-08-29 15:47:34 -04001125 kfree(root->name);
1126 kfree(root);
1127 return ERR_PTR(ret);
1128 }
Chris Masonea9e8b12008-11-17 21:14:24 -05001129#endif
Chris Mason4313b392008-01-03 09:08:48 -05001130 root->in_sysfs = 1;
Chris Mason0f7d52f2007-04-09 10:42:37 -04001131 return root;
1132}
Chris Mason04160082008-03-26 10:28:07 -04001133
1134static int btrfs_congested_fn(void *congested_data, int bdi_bits)
1135{
1136 struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
1137 int ret = 0;
Chris Mason04160082008-03-26 10:28:07 -04001138 struct btrfs_device *device;
1139 struct backing_dev_info *bdi;
Chris Mason6f3577b2008-11-13 09:59:36 -05001140#if 0
Chris Masoncb03c742008-05-15 16:15:45 -04001141 if ((bdi_bits & (1 << BDI_write_congested)) &&
Chris Mason777e6bd2008-08-15 15:34:15 -04001142 btrfs_congested_async(info, 0))
Chris Masoncb03c742008-05-15 16:15:45 -04001143 return 1;
Chris Mason6f3577b2008-11-13 09:59:36 -05001144#endif
Qinghuang Fengc6e30872009-01-21 10:59:08 -05001145 list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
Chris Masondfe25022008-05-13 13:46:40 -04001146 if (!device->bdev)
1147 continue;
Chris Mason04160082008-03-26 10:28:07 -04001148 bdi = blk_get_backing_dev_info(device->bdev);
1149 if (bdi && bdi_congested(bdi, bdi_bits)) {
1150 ret = 1;
1151 break;
1152 }
1153 }
1154 return ret;
1155}
1156
Chris Mason38b66982008-04-22 09:22:11 -04001157/*
1158 * this unplugs every device on the box, and it is only used when page
1159 * is null
1160 */
1161static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
1162{
Chris Mason38b66982008-04-22 09:22:11 -04001163 struct btrfs_device *device;
1164 struct btrfs_fs_info *info;
1165
1166 info = (struct btrfs_fs_info *)bdi->unplug_io_data;
Qinghuang Fengc6e30872009-01-21 10:59:08 -05001167 list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
Chris Masond20f7042008-12-08 16:58:54 -05001168 if (!device->bdev)
1169 continue;
1170
Chris Mason38b66982008-04-22 09:22:11 -04001171 bdi = blk_get_backing_dev_info(device->bdev);
Chris Masond3977122009-01-05 21:25:51 -05001172 if (bdi->unplug_io_fn)
Chris Mason38b66982008-04-22 09:22:11 -04001173 bdi->unplug_io_fn(bdi, page);
Chris Mason38b66982008-04-22 09:22:11 -04001174 }
1175}
1176
Christoph Hellwigb2950862008-12-02 09:54:17 -05001177static void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
Chris Mason04160082008-03-26 10:28:07 -04001178{
Chris Mason38b66982008-04-22 09:22:11 -04001179 struct inode *inode;
Chris Masonf2d8d742008-04-21 10:03:05 -04001180 struct extent_map_tree *em_tree;
1181 struct extent_map *em;
Chris Masonbcbfce82008-04-22 13:26:47 -04001182 struct address_space *mapping;
Chris Mason38b66982008-04-22 09:22:11 -04001183 u64 offset;
1184
Chris Masonbcbfce82008-04-22 13:26:47 -04001185 /* the generic O_DIRECT read code does this */
Chris Mason9f0ba5b2008-11-18 10:31:22 -05001186 if (1 || !page) {
Chris Mason38b66982008-04-22 09:22:11 -04001187 __unplug_io_fn(bdi, page);
1188 return;
1189 }
1190
Chris Masonbcbfce82008-04-22 13:26:47 -04001191 /*
1192 * page->mapping may change at any time. Get a consistent copy
1193 * and use that for everything below
1194 */
1195 smp_mb();
1196 mapping = page->mapping;
1197 if (!mapping)
1198 return;
1199
1200 inode = mapping->host;
Chris Mason240d5d42008-11-10 13:08:31 -05001201
1202 /*
1203 * don't do the expensive searching for a small number of
1204 * devices
1205 */
1206 if (BTRFS_I(inode)->root->fs_info->fs_devices->open_devices <= 2) {
1207 __unplug_io_fn(bdi, page);
1208 return;
1209 }
1210
Chris Mason38b66982008-04-22 09:22:11 -04001211 offset = page_offset(page);
Chris Mason04160082008-03-26 10:28:07 -04001212
Chris Masonf2d8d742008-04-21 10:03:05 -04001213 em_tree = &BTRFS_I(inode)->extent_tree;
1214 spin_lock(&em_tree->lock);
1215 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
1216 spin_unlock(&em_tree->lock);
Chris Mason89642222008-07-24 09:41:53 -04001217 if (!em) {
1218 __unplug_io_fn(bdi, page);
Chris Masonf2d8d742008-04-21 10:03:05 -04001219 return;
Chris Mason89642222008-07-24 09:41:53 -04001220 }
Chris Masonf2d8d742008-04-21 10:03:05 -04001221
Chris Mason89642222008-07-24 09:41:53 -04001222 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
1223 free_extent_map(em);
1224 __unplug_io_fn(bdi, page);
1225 return;
1226 }
Chris Masonf2d8d742008-04-21 10:03:05 -04001227 offset = offset - em->start;
1228 btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree,
1229 em->block_start + offset, page);
1230 free_extent_map(em);
Chris Mason04160082008-03-26 10:28:07 -04001231}
1232
1233static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
1234{
1235 bdi_init(bdi);
Chris Mason4575c9c2008-04-18 16:13:31 -04001236 bdi->ra_pages = default_backing_dev_info.ra_pages;
Chris Mason04160082008-03-26 10:28:07 -04001237 bdi->state = 0;
1238 bdi->capabilities = default_backing_dev_info.capabilities;
1239 bdi->unplug_io_fn = btrfs_unplug_io_fn;
1240 bdi->unplug_io_data = info;
1241 bdi->congested_fn = btrfs_congested_fn;
1242 bdi->congested_data = info;
1243 return 0;
1244}
1245
Chris Masonce9adaa2008-04-09 16:28:12 -04001246static int bio_ready_for_csum(struct bio *bio)
1247{
1248 u64 length = 0;
1249 u64 buf_len = 0;
1250 u64 start = 0;
1251 struct page *page;
1252 struct extent_io_tree *io_tree = NULL;
1253 struct btrfs_fs_info *info = NULL;
1254 struct bio_vec *bvec;
1255 int i;
1256 int ret;
1257
1258 bio_for_each_segment(bvec, bio, i) {
1259 page = bvec->bv_page;
1260 if (page->private == EXTENT_PAGE_PRIVATE) {
1261 length += bvec->bv_len;
1262 continue;
1263 }
1264 if (!page->private) {
1265 length += bvec->bv_len;
1266 continue;
1267 }
1268 length = bvec->bv_len;
1269 buf_len = page->private >> 2;
1270 start = page_offset(page) + bvec->bv_offset;
1271 io_tree = &BTRFS_I(page->mapping->host)->io_tree;
1272 info = BTRFS_I(page->mapping->host)->root->fs_info;
1273 }
1274 /* are we fully contained in this bio? */
1275 if (buf_len <= length)
1276 return 1;
1277
1278 ret = extent_range_uptodate(io_tree, start + length,
1279 start + buf_len - 1);
1280 if (ret == 1)
1281 return ret;
1282 return ret;
1283}
1284
Chris Mason8b712842008-06-11 16:50:36 -04001285/*
1286 * called by the kthread helper functions to finally call the bio end_io
1287 * functions. This is where read checksum verification actually happens
1288 */
1289static void end_workqueue_fn(struct btrfs_work *work)
Chris Masonce9adaa2008-04-09 16:28:12 -04001290{
Chris Masonce9adaa2008-04-09 16:28:12 -04001291 struct bio *bio;
Chris Mason8b712842008-06-11 16:50:36 -04001292 struct end_io_wq *end_io_wq;
1293 struct btrfs_fs_info *fs_info;
Chris Masonce9adaa2008-04-09 16:28:12 -04001294 int error;
Chris Masonce9adaa2008-04-09 16:28:12 -04001295
Chris Mason8b712842008-06-11 16:50:36 -04001296 end_io_wq = container_of(work, struct end_io_wq, work);
1297 bio = end_io_wq->bio;
1298 fs_info = end_io_wq->info;
Chris Masonce9adaa2008-04-09 16:28:12 -04001299
Chris Masoncad321a2008-12-17 14:51:42 -05001300 /* metadata bio reads are special because the whole tree block must
Chris Mason8b712842008-06-11 16:50:36 -04001301 * be checksummed at once. This makes sure the entire block is in
1302 * ram and up to date before trying to verify things. For
1303 * blocksize <= pagesize, it is basically a noop
1304 */
Chris Masoncad321a2008-12-17 14:51:42 -05001305 if (!(bio->bi_rw & (1 << BIO_RW)) && end_io_wq->metadata &&
1306 !bio_ready_for_csum(bio)) {
Chris Masond20f7042008-12-08 16:58:54 -05001307 btrfs_queue_worker(&fs_info->endio_meta_workers,
Chris Mason8b712842008-06-11 16:50:36 -04001308 &end_io_wq->work);
1309 return;
1310 }
1311 error = end_io_wq->error;
1312 bio->bi_private = end_io_wq->private;
1313 bio->bi_end_io = end_io_wq->end_io;
1314 kfree(end_io_wq);
Chris Mason8b712842008-06-11 16:50:36 -04001315 bio_endio(bio, error);
Chris Mason44b8bd72008-04-16 11:14:51 -04001316}
1317
Chris Masona74a4b92008-06-25 16:01:31 -04001318static int cleaner_kthread(void *arg)
1319{
1320 struct btrfs_root *root = arg;
1321
1322 do {
1323 smp_mb();
1324 if (root->fs_info->closing)
1325 break;
1326
1327 vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE);
1328 mutex_lock(&root->fs_info->cleaner_mutex);
Chris Masona74a4b92008-06-25 16:01:31 -04001329 btrfs_clean_old_snapshots(root);
Chris Masona74a4b92008-06-25 16:01:31 -04001330 mutex_unlock(&root->fs_info->cleaner_mutex);
1331
1332 if (freezing(current)) {
1333 refrigerator();
1334 } else {
1335 smp_mb();
1336 if (root->fs_info->closing)
1337 break;
1338 set_current_state(TASK_INTERRUPTIBLE);
1339 schedule();
1340 __set_current_state(TASK_RUNNING);
1341 }
1342 } while (!kthread_should_stop());
1343 return 0;
1344}
1345
1346static int transaction_kthread(void *arg)
1347{
1348 struct btrfs_root *root = arg;
1349 struct btrfs_trans_handle *trans;
1350 struct btrfs_transaction *cur;
1351 unsigned long now;
1352 unsigned long delay;
1353 int ret;
1354
1355 do {
1356 smp_mb();
1357 if (root->fs_info->closing)
1358 break;
1359
1360 delay = HZ * 30;
1361 vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE);
1362 mutex_lock(&root->fs_info->transaction_kthread_mutex);
1363
Chris Masonab78c842008-07-29 16:15:18 -04001364 if (root->fs_info->total_ref_cache_size > 20 * 1024 * 1024) {
Chris Masond3977122009-01-05 21:25:51 -05001365 printk(KERN_INFO "btrfs: total reference cache "
1366 "size %llu\n",
1367 root->fs_info->total_ref_cache_size);
Chris Masonab78c842008-07-29 16:15:18 -04001368 }
Yan Zheng31153d82008-07-28 15:32:19 -04001369
Chris Masona74a4b92008-06-25 16:01:31 -04001370 mutex_lock(&root->fs_info->trans_mutex);
1371 cur = root->fs_info->running_transaction;
1372 if (!cur) {
1373 mutex_unlock(&root->fs_info->trans_mutex);
1374 goto sleep;
1375 }
Yan Zheng31153d82008-07-28 15:32:19 -04001376
Chris Masona74a4b92008-06-25 16:01:31 -04001377 now = get_seconds();
1378 if (now < cur->start_time || now - cur->start_time < 30) {
1379 mutex_unlock(&root->fs_info->trans_mutex);
1380 delay = HZ * 5;
1381 goto sleep;
1382 }
1383 mutex_unlock(&root->fs_info->trans_mutex);
Chris Masona74a4b92008-06-25 16:01:31 -04001384 trans = btrfs_start_transaction(root, 1);
1385 ret = btrfs_commit_transaction(trans, root);
1386sleep:
1387 wake_up_process(root->fs_info->cleaner_kthread);
1388 mutex_unlock(&root->fs_info->transaction_kthread_mutex);
1389
1390 if (freezing(current)) {
1391 refrigerator();
1392 } else {
1393 if (root->fs_info->closing)
1394 break;
1395 set_current_state(TASK_INTERRUPTIBLE);
1396 schedule_timeout(delay);
1397 __set_current_state(TASK_RUNNING);
1398 }
1399 } while (!kthread_should_stop());
1400 return 0;
1401}
1402
Chris Mason8a4b83c2008-03-24 15:02:07 -04001403struct btrfs_root *open_ctree(struct super_block *sb,
Chris Masondfe25022008-05-13 13:46:40 -04001404 struct btrfs_fs_devices *fs_devices,
1405 char *options)
Chris Masoneb60cea2007-02-02 09:18:22 -05001406{
Chris Masondb945352007-10-15 16:15:53 -04001407 u32 sectorsize;
1408 u32 nodesize;
1409 u32 leafsize;
1410 u32 blocksize;
Chris Mason87ee04e2007-11-30 11:30:34 -05001411 u32 stripesize;
Yan Zheng84234f32008-10-29 14:49:05 -04001412 u64 generation;
Josef Bacikf2b636e2008-12-02 06:36:08 -05001413 u64 features;
Chris Mason3de45862008-11-17 21:02:50 -05001414 struct btrfs_key location;
Chris Masona061fc82008-05-07 11:43:44 -04001415 struct buffer_head *bh;
Chris Masone02119d2008-09-05 16:13:11 -04001416 struct btrfs_root *extent_root = kzalloc(sizeof(struct btrfs_root),
Chris Masone20d96d2007-03-22 12:13:20 -04001417 GFP_NOFS);
Chris Masond20f7042008-12-08 16:58:54 -05001418 struct btrfs_root *csum_root = kzalloc(sizeof(struct btrfs_root),
1419 GFP_NOFS);
Chris Masone02119d2008-09-05 16:13:11 -04001420 struct btrfs_root *tree_root = kzalloc(sizeof(struct btrfs_root),
Chris Masone20d96d2007-03-22 12:13:20 -04001421 GFP_NOFS);
Chris Mason8790d502008-04-03 16:29:03 -04001422 struct btrfs_fs_info *fs_info = kzalloc(sizeof(*fs_info),
Chris Masone20d96d2007-03-22 12:13:20 -04001423 GFP_NOFS);
Chris Masone02119d2008-09-05 16:13:11 -04001424 struct btrfs_root *chunk_root = kzalloc(sizeof(struct btrfs_root),
Chris Mason0b86a832008-03-24 15:01:56 -04001425 GFP_NOFS);
Chris Masone02119d2008-09-05 16:13:11 -04001426 struct btrfs_root *dev_root = kzalloc(sizeof(struct btrfs_root),
Chris Mason0b86a832008-03-24 15:01:56 -04001427 GFP_NOFS);
Chris Masone02119d2008-09-05 16:13:11 -04001428 struct btrfs_root *log_tree_root;
1429
Chris Masoneb60cea2007-02-02 09:18:22 -05001430 int ret;
Yane58ca022008-04-01 11:21:34 -04001431 int err = -EINVAL;
Chris Mason4543df72008-06-11 21:47:56 -04001432
Chris Mason2c90e5d2007-04-02 10:50:19 -04001433 struct btrfs_super_block *disk_super;
Chris Mason8790d502008-04-03 16:29:03 -04001434
Jim Meyering0463bb42008-10-01 19:09:04 -04001435 if (!extent_root || !tree_root || !fs_info ||
Chris Masond20f7042008-12-08 16:58:54 -05001436 !chunk_root || !dev_root || !csum_root) {
Chris Mason39279cc2007-06-12 06:35:45 -04001437 err = -ENOMEM;
1438 goto fail;
1439 }
Chris Mason0f7d52f2007-04-09 10:42:37 -04001440 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
Chris Mason8fd17792007-04-19 21:01:03 -04001441 INIT_LIST_HEAD(&fs_info->trans_list);
Chris Masonfacda1e2007-06-08 18:11:48 -04001442 INIT_LIST_HEAD(&fs_info->dead_roots);
Chris Mason19c00dd2007-10-15 16:19:22 -04001443 INIT_LIST_HEAD(&fs_info->hashers);
Chris Masonea8c2812008-08-04 23:17:27 -04001444 INIT_LIST_HEAD(&fs_info->delalloc_inodes);
Chris Mason19c00dd2007-10-15 16:19:22 -04001445 spin_lock_init(&fs_info->hash_lock);
Chris Mason1832a6d2007-12-21 16:27:21 -05001446 spin_lock_init(&fs_info->delalloc_lock);
Chris Masoncee36a02008-01-15 08:40:48 -05001447 spin_lock_init(&fs_info->new_trans_lock);
Yan Zheng31153d82008-07-28 15:32:19 -04001448 spin_lock_init(&fs_info->ref_cache_lock);
Chris Mason19c00dd2007-10-15 16:19:22 -04001449
Josef Bacik58176a92007-08-29 15:47:34 -04001450 init_completion(&fs_info->kobj_unregister);
Chris Mason9f5fae22007-03-20 14:38:32 -04001451 fs_info->tree_root = tree_root;
1452 fs_info->extent_root = extent_root;
Chris Masond20f7042008-12-08 16:58:54 -05001453 fs_info->csum_root = csum_root;
Chris Mason0b86a832008-03-24 15:01:56 -04001454 fs_info->chunk_root = chunk_root;
1455 fs_info->dev_root = dev_root;
Chris Mason8a4b83c2008-03-24 15:02:07 -04001456 fs_info->fs_devices = fs_devices;
Chris Mason0b86a832008-03-24 15:01:56 -04001457 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
Chris Mason6324fbf2008-03-24 15:01:59 -04001458 INIT_LIST_HEAD(&fs_info->space_info);
Chris Mason0b86a832008-03-24 15:01:56 -04001459 btrfs_mapping_init(&fs_info->mapping_tree);
Chris Masoncb03c742008-05-15 16:15:45 -04001460 atomic_set(&fs_info->nr_async_submits, 0);
Chris Mason771ed682008-11-06 22:02:51 -05001461 atomic_set(&fs_info->async_delalloc_pages, 0);
Chris Mason8c8bee12008-09-29 11:19:10 -04001462 atomic_set(&fs_info->async_submit_draining, 0);
Chris Mason0986fe9e2008-08-15 15:34:15 -04001463 atomic_set(&fs_info->nr_async_bios, 0);
Chris Masona2135012008-06-25 16:01:30 -04001464 atomic_set(&fs_info->throttles, 0);
Chris Masonab78c842008-07-29 16:15:18 -04001465 atomic_set(&fs_info->throttle_gen, 0);
Chris Masone20d96d2007-03-22 12:13:20 -04001466 fs_info->sb = sb;
Chris Masonc59f8952007-12-17 20:14:04 -05001467 fs_info->max_extent = (u64)-1;
Chris Mason6f568d32008-01-29 16:03:38 -05001468 fs_info->max_inline = 8192 * 1024;
Chris Mason04160082008-03-26 10:28:07 -04001469 setup_bdi(fs_info, &fs_info->bdi);
Chris Masond98237b2007-03-28 13:57:48 -04001470 fs_info->btree_inode = new_inode(sb);
1471 fs_info->btree_inode->i_ino = 1;
Chris Mason2c90e5d2007-04-02 10:50:19 -04001472 fs_info->btree_inode->i_nlink = 1;
Chris Masonc8b97812008-10-29 14:49:59 -04001473
Chris Masonb34b0862008-12-19 15:43:22 -05001474 fs_info->thread_pool_size = min_t(unsigned long,
1475 num_online_cpus() + 2, 8);
Chris Mason0afbaf82008-04-18 14:17:20 -04001476
Chris Mason3eaa2882008-07-24 11:57:52 -04001477 INIT_LIST_HEAD(&fs_info->ordered_extents);
1478 spin_lock_init(&fs_info->ordered_extent_lock);
1479
Chris Masona061fc82008-05-07 11:43:44 -04001480 sb->s_blocksize = 4096;
1481 sb->s_blocksize_bits = blksize_bits(4096);
1482
Chris Mason0afbaf82008-04-18 14:17:20 -04001483 /*
1484 * we set the i_size on the btree inode to the max possible int.
1485 * the real end of the address space is determined by all of
1486 * the devices in the system
1487 */
1488 fs_info->btree_inode->i_size = OFFSET_MAX;
Chris Masond98237b2007-03-28 13:57:48 -04001489 fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
Chris Mason04160082008-03-26 10:28:07 -04001490 fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi;
1491
Chris Masond1310b22008-01-24 16:13:08 -05001492 extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,
Chris Mason5f39d392007-10-15 16:14:19 -04001493 fs_info->btree_inode->i_mapping,
1494 GFP_NOFS);
Chris Masond1310b22008-01-24 16:13:08 -05001495 extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
1496 GFP_NOFS);
Chris Mason0da54682007-11-07 21:08:01 -05001497
Chris Masond1310b22008-01-24 16:13:08 -05001498 BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops;
1499
Josef Bacik0f9dd462008-09-23 13:14:11 -04001500 spin_lock_init(&fs_info->block_group_cache_lock);
1501 fs_info->block_group_cache_tree.rb_node = NULL;
1502
Chris Masond1310b22008-01-24 16:13:08 -05001503 extent_io_tree_init(&fs_info->pinned_extents,
Chris Mason1a5bc162007-10-15 16:15:26 -04001504 fs_info->btree_inode->i_mapping, GFP_NOFS);
Chris Masond1310b22008-01-24 16:13:08 -05001505 extent_io_tree_init(&fs_info->pending_del,
Chris Mason1a5bc162007-10-15 16:15:26 -04001506 fs_info->btree_inode->i_mapping, GFP_NOFS);
Chris Masond1310b22008-01-24 16:13:08 -05001507 extent_io_tree_init(&fs_info->extent_ins,
Chris Mason1a5bc162007-10-15 16:15:26 -04001508 fs_info->btree_inode->i_mapping, GFP_NOFS);
Chris Masone66f7092007-04-20 13:16:02 -04001509 fs_info->do_barriers = 1;
Chris Masone18e4802008-01-18 10:54:22 -05001510
Zheng Yan1a40e232008-09-26 10:09:34 -04001511 INIT_LIST_HEAD(&fs_info->dead_reloc_roots);
1512 btrfs_leaf_ref_tree_init(&fs_info->reloc_ref_tree);
Zheng Yane4657682008-09-26 10:04:53 -04001513 btrfs_leaf_ref_tree_init(&fs_info->shared_ref_tree);
1514
Chris Mason0f7d52f2007-04-09 10:42:37 -04001515 BTRFS_I(fs_info->btree_inode)->root = tree_root;
1516 memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
1517 sizeof(struct btrfs_key));
Chris Mason22b0ebd2007-03-30 08:47:31 -04001518 insert_inode_hash(fs_info->btree_inode);
Chris Mason39279cc2007-06-12 06:35:45 -04001519
Chris Mason79154b12007-03-22 15:59:16 -04001520 mutex_init(&fs_info->trans_mutex);
Chris Masone02119d2008-09-05 16:13:11 -04001521 mutex_init(&fs_info->tree_log_mutex);
Chris Masona2135012008-06-25 16:01:30 -04001522 mutex_init(&fs_info->drop_mutex);
Josef Bacik25179202008-10-29 14:49:05 -04001523 mutex_init(&fs_info->extent_ins_mutex);
1524 mutex_init(&fs_info->pinned_mutex);
Chris Mason925baed2008-06-25 16:01:30 -04001525 mutex_init(&fs_info->chunk_mutex);
Chris Masona74a4b92008-06-25 16:01:31 -04001526 mutex_init(&fs_info->transaction_kthread_mutex);
1527 mutex_init(&fs_info->cleaner_mutex);
Chris Mason7d9eb122008-07-08 14:19:17 -04001528 mutex_init(&fs_info->volume_mutex);
Zheng Yan1a40e232008-09-26 10:09:34 -04001529 mutex_init(&fs_info->tree_reloc_mutex);
Chris Masone6dcd2d2008-07-17 12:53:50 -04001530 init_waitqueue_head(&fs_info->transaction_throttle);
Chris Masonf9295742008-07-17 12:54:14 -04001531 init_waitqueue_head(&fs_info->transaction_wait);
Chris Mason4854ddd2008-08-15 15:34:17 -04001532 init_waitqueue_head(&fs_info->async_submit_wait);
Chris Masone02119d2008-09-05 16:13:11 -04001533 init_waitqueue_head(&fs_info->tree_log_wait);
1534 atomic_set(&fs_info->tree_log_commit, 0);
1535 atomic_set(&fs_info->tree_log_writers, 0);
1536 fs_info->tree_log_transid = 0;
Chris Mason3768f362007-03-13 16:47:54 -04001537
Chris Mason0b86a832008-03-24 15:01:56 -04001538 __setup_root(4096, 4096, 4096, 4096, tree_root,
Chris Mason2c90e5d2007-04-02 10:50:19 -04001539 fs_info, BTRFS_ROOT_TREE_OBJECTID);
Chris Mason7eccb902007-04-11 15:53:25 -04001540
Chris Masond98237b2007-03-28 13:57:48 -04001541
Yan Zhenga512bbf2008-12-08 16:46:26 -05001542 bh = btrfs_read_dev_super(fs_devices->latest_bdev);
Chris Masona061fc82008-05-07 11:43:44 -04001543 if (!bh)
Chris Mason39279cc2007-06-12 06:35:45 -04001544 goto fail_iput;
Chris Mason39279cc2007-06-12 06:35:45 -04001545
Chris Masona061fc82008-05-07 11:43:44 -04001546 memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy));
Yan Zheng2d69a0f2009-01-05 15:43:42 -05001547 memcpy(&fs_info->super_for_commit, &fs_info->super_copy,
1548 sizeof(fs_info->super_for_commit));
Chris Masona061fc82008-05-07 11:43:44 -04001549 brelse(bh);
Chris Mason5f39d392007-10-15 16:14:19 -04001550
Chris Masona061fc82008-05-07 11:43:44 -04001551 memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE);
Chris Mason0b86a832008-03-24 15:01:56 -04001552
Chris Mason5f39d392007-10-15 16:14:19 -04001553 disk_super = &fs_info->super_copy;
Chris Mason0f7d52f2007-04-09 10:42:37 -04001554 if (!btrfs_super_root(disk_super))
Josef Bacikc6e2bac2008-12-02 06:36:10 -05001555 goto fail_iput;
Chris Mason0f7d52f2007-04-09 10:42:37 -04001556
Yan Zheng2b820322008-11-17 21:11:30 -05001557 ret = btrfs_parse_options(tree_root, options);
1558 if (ret) {
1559 err = ret;
Josef Bacikc6e2bac2008-12-02 06:36:10 -05001560 goto fail_iput;
Yan Zheng2b820322008-11-17 21:11:30 -05001561 }
Chris Masondfe25022008-05-13 13:46:40 -04001562
Josef Bacikf2b636e2008-12-02 06:36:08 -05001563 features = btrfs_super_incompat_flags(disk_super) &
1564 ~BTRFS_FEATURE_INCOMPAT_SUPP;
1565 if (features) {
1566 printk(KERN_ERR "BTRFS: couldn't mount because of "
1567 "unsupported optional features (%Lx).\n",
1568 features);
1569 err = -EINVAL;
Josef Bacikc6e2bac2008-12-02 06:36:10 -05001570 goto fail_iput;
Josef Bacikf2b636e2008-12-02 06:36:08 -05001571 }
1572
1573 features = btrfs_super_compat_ro_flags(disk_super) &
1574 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
1575 if (!(sb->s_flags & MS_RDONLY) && features) {
1576 printk(KERN_ERR "BTRFS: couldn't mount RDWR because of "
1577 "unsupported option features (%Lx).\n",
1578 features);
1579 err = -EINVAL;
Josef Bacikc6e2bac2008-12-02 06:36:10 -05001580 goto fail_iput;
Josef Bacikf2b636e2008-12-02 06:36:08 -05001581 }
1582
Chris Mason4543df72008-06-11 21:47:56 -04001583 /*
1584 * we need to start all the end_io workers up front because the
1585 * queue work function gets called at interrupt time, and so it
1586 * cannot dynamically grow.
1587 */
Chris Mason5443be42008-08-15 15:34:16 -04001588 btrfs_init_workers(&fs_info->workers, "worker",
1589 fs_info->thread_pool_size);
Chris Masonc8b97812008-10-29 14:49:59 -04001590
Chris Mason771ed682008-11-06 22:02:51 -05001591 btrfs_init_workers(&fs_info->delalloc_workers, "delalloc",
1592 fs_info->thread_pool_size);
1593
Chris Mason5443be42008-08-15 15:34:16 -04001594 btrfs_init_workers(&fs_info->submit_workers, "submit",
Chris Masonb720d202008-08-15 15:34:14 -04001595 min_t(u64, fs_devices->num_devices,
1596 fs_info->thread_pool_size));
Chris Mason61b49442008-07-31 15:42:53 -04001597
1598 /* a higher idle thresh on the submit workers makes it much more
1599 * likely that bios will be send down in a sane order to the
1600 * devices
1601 */
1602 fs_info->submit_workers.idle_thresh = 64;
Chris Mason53863232008-08-15 15:34:18 -04001603
Chris Mason771ed682008-11-06 22:02:51 -05001604 fs_info->workers.idle_thresh = 16;
Chris Mason4a69a412008-11-06 22:03:00 -05001605 fs_info->workers.ordered = 1;
Chris Mason61b49442008-07-31 15:42:53 -04001606
Chris Mason771ed682008-11-06 22:02:51 -05001607 fs_info->delalloc_workers.idle_thresh = 2;
1608 fs_info->delalloc_workers.ordered = 1;
1609
Chris Mason5443be42008-08-15 15:34:16 -04001610 btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1);
1611 btrfs_init_workers(&fs_info->endio_workers, "endio",
1612 fs_info->thread_pool_size);
Chris Masond20f7042008-12-08 16:58:54 -05001613 btrfs_init_workers(&fs_info->endio_meta_workers, "endio-meta",
1614 fs_info->thread_pool_size);
Chris Masoncad321a2008-12-17 14:51:42 -05001615 btrfs_init_workers(&fs_info->endio_meta_write_workers,
1616 "endio-meta-write", fs_info->thread_pool_size);
Chris Mason5443be42008-08-15 15:34:16 -04001617 btrfs_init_workers(&fs_info->endio_write_workers, "endio-write",
Chris Masone6dcd2d2008-07-17 12:53:50 -04001618 fs_info->thread_pool_size);
Chris Mason61b49442008-07-31 15:42:53 -04001619
1620 /*
1621 * endios are largely parallel and should have a very
1622 * low idle thresh
1623 */
1624 fs_info->endio_workers.idle_thresh = 4;
Chris Mason3a5f1d42008-09-11 15:53:37 -04001625 fs_info->endio_write_workers.idle_thresh = 64;
Chris Masoncad321a2008-12-17 14:51:42 -05001626 fs_info->endio_meta_write_workers.idle_thresh = 64;
Chris Mason61b49442008-07-31 15:42:53 -04001627
Chris Mason4543df72008-06-11 21:47:56 -04001628 btrfs_start_workers(&fs_info->workers, 1);
Chris Mason1cc127b2008-06-12 14:46:17 -04001629 btrfs_start_workers(&fs_info->submit_workers, 1);
Chris Mason771ed682008-11-06 22:02:51 -05001630 btrfs_start_workers(&fs_info->delalloc_workers, 1);
Chris Mason247e7432008-07-17 12:53:51 -04001631 btrfs_start_workers(&fs_info->fixup_workers, 1);
Chris Mason4543df72008-06-11 21:47:56 -04001632 btrfs_start_workers(&fs_info->endio_workers, fs_info->thread_pool_size);
Chris Masond20f7042008-12-08 16:58:54 -05001633 btrfs_start_workers(&fs_info->endio_meta_workers,
1634 fs_info->thread_pool_size);
Chris Masoncad321a2008-12-17 14:51:42 -05001635 btrfs_start_workers(&fs_info->endio_meta_write_workers,
1636 fs_info->thread_pool_size);
Chris Masone6dcd2d2008-07-17 12:53:50 -04001637 btrfs_start_workers(&fs_info->endio_write_workers,
1638 fs_info->thread_pool_size);
Chris Mason4543df72008-06-11 21:47:56 -04001639
Chris Mason4575c9c2008-04-18 16:13:31 -04001640 fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super);
Chris Masonc8b97812008-10-29 14:49:59 -04001641 fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages,
1642 4 * 1024 * 1024 / PAGE_CACHE_SIZE);
Chris Mason4575c9c2008-04-18 16:13:31 -04001643
Chris Masondb945352007-10-15 16:15:53 -04001644 nodesize = btrfs_super_nodesize(disk_super);
1645 leafsize = btrfs_super_leafsize(disk_super);
1646 sectorsize = btrfs_super_sectorsize(disk_super);
Chris Mason87ee04e2007-11-30 11:30:34 -05001647 stripesize = btrfs_super_stripesize(disk_super);
Chris Masondb945352007-10-15 16:15:53 -04001648 tree_root->nodesize = nodesize;
1649 tree_root->leafsize = leafsize;
1650 tree_root->sectorsize = sectorsize;
Chris Mason87ee04e2007-11-30 11:30:34 -05001651 tree_root->stripesize = stripesize;
Chris Masona061fc82008-05-07 11:43:44 -04001652
1653 sb->s_blocksize = sectorsize;
1654 sb->s_blocksize_bits = blksize_bits(sectorsize);
Chris Masondb945352007-10-15 16:15:53 -04001655
Chris Mason39279cc2007-06-12 06:35:45 -04001656 if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
1657 sizeof(disk_super->magic))) {
Chris Masond3977122009-01-05 21:25:51 -05001658 printk(KERN_INFO "btrfs: valid FS not found on %s\n", sb->s_id);
Chris Mason39279cc2007-06-12 06:35:45 -04001659 goto fail_sb_buffer;
1660 }
Chris Mason19c00dd2007-10-15 16:19:22 -04001661
Chris Mason925baed2008-06-25 16:01:30 -04001662 mutex_lock(&fs_info->chunk_mutex);
Yan Zhenge4404d62008-12-12 10:03:26 -05001663 ret = btrfs_read_sys_array(tree_root);
Chris Mason925baed2008-06-25 16:01:30 -04001664 mutex_unlock(&fs_info->chunk_mutex);
Chris Mason84eed902008-04-25 09:04:37 -04001665 if (ret) {
Chris Masond3977122009-01-05 21:25:51 -05001666 printk(KERN_WARNING "btrfs: failed to read the system "
1667 "array on %s\n", sb->s_id);
Chris Mason84eed902008-04-25 09:04:37 -04001668 goto fail_sys_array;
1669 }
Chris Mason0b86a832008-03-24 15:01:56 -04001670
1671 blocksize = btrfs_level_size(tree_root,
1672 btrfs_super_chunk_root_level(disk_super));
Yan Zheng84234f32008-10-29 14:49:05 -04001673 generation = btrfs_super_chunk_root_generation(disk_super);
Chris Mason0b86a832008-03-24 15:01:56 -04001674
1675 __setup_root(nodesize, leafsize, sectorsize, stripesize,
1676 chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
1677
1678 chunk_root->node = read_tree_block(chunk_root,
1679 btrfs_super_chunk_root(disk_super),
Yan Zheng84234f32008-10-29 14:49:05 -04001680 blocksize, generation);
Chris Mason0b86a832008-03-24 15:01:56 -04001681 BUG_ON(!chunk_root->node);
1682
Chris Masone17cade2008-04-15 15:41:47 -04001683 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
Chris Masond3977122009-01-05 21:25:51 -05001684 (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
1685 BTRFS_UUID_SIZE);
Chris Masone17cade2008-04-15 15:41:47 -04001686
Chris Mason925baed2008-06-25 16:01:30 -04001687 mutex_lock(&fs_info->chunk_mutex);
Chris Mason0b86a832008-03-24 15:01:56 -04001688 ret = btrfs_read_chunk_tree(chunk_root);
Chris Mason925baed2008-06-25 16:01:30 -04001689 mutex_unlock(&fs_info->chunk_mutex);
Yan Zheng2b820322008-11-17 21:11:30 -05001690 if (ret) {
Chris Masond3977122009-01-05 21:25:51 -05001691 printk(KERN_WARNING "btrfs: failed to read chunk tree on %s\n",
1692 sb->s_id);
Yan Zheng2b820322008-11-17 21:11:30 -05001693 goto fail_chunk_root;
1694 }
Chris Mason0b86a832008-03-24 15:01:56 -04001695
Chris Masondfe25022008-05-13 13:46:40 -04001696 btrfs_close_extra_devices(fs_devices);
1697
Chris Masondb945352007-10-15 16:15:53 -04001698 blocksize = btrfs_level_size(tree_root,
1699 btrfs_super_root_level(disk_super));
Yan Zheng84234f32008-10-29 14:49:05 -04001700 generation = btrfs_super_generation(disk_super);
Chris Mason0b86a832008-03-24 15:01:56 -04001701
Chris Masone20d96d2007-03-22 12:13:20 -04001702 tree_root->node = read_tree_block(tree_root,
Chris Masondb945352007-10-15 16:15:53 -04001703 btrfs_super_root(disk_super),
Yan Zheng84234f32008-10-29 14:49:05 -04001704 blocksize, generation);
Chris Mason39279cc2007-06-12 06:35:45 -04001705 if (!tree_root->node)
Yan Zheng2b820322008-11-17 21:11:30 -05001706 goto fail_chunk_root;
Chris Mason3768f362007-03-13 16:47:54 -04001707
Chris Masondb945352007-10-15 16:15:53 -04001708
1709 ret = find_and_setup_root(tree_root, fs_info,
Chris Masone20d96d2007-03-22 12:13:20 -04001710 BTRFS_EXTENT_TREE_OBJECTID, extent_root);
Chris Mason0b86a832008-03-24 15:01:56 -04001711 if (ret)
Chris Mason39279cc2007-06-12 06:35:45 -04001712 goto fail_tree_root;
Chris Mason0b86a832008-03-24 15:01:56 -04001713 extent_root->track_dirty = 1;
1714
1715 ret = find_and_setup_root(tree_root, fs_info,
1716 BTRFS_DEV_TREE_OBJECTID, dev_root);
1717 dev_root->track_dirty = 1;
1718
1719 if (ret)
1720 goto fail_extent_root;
Chris Mason3768f362007-03-13 16:47:54 -04001721
Chris Masond20f7042008-12-08 16:58:54 -05001722 ret = find_and_setup_root(tree_root, fs_info,
1723 BTRFS_CSUM_TREE_OBJECTID, csum_root);
1724 if (ret)
1725 goto fail_extent_root;
1726
1727 csum_root->track_dirty = 1;
1728
Chris Mason9078a3e2007-04-26 16:46:15 -04001729 btrfs_read_block_groups(extent_root);
1730
Yan Zheng2d69a0f2009-01-05 15:43:42 -05001731 fs_info->generation = generation;
Yan Zhengc146afa2008-11-12 14:34:12 -05001732 fs_info->last_trans_committed = generation;
Chris Masond18a2c42008-04-04 15:40:00 -04001733 fs_info->data_alloc_profile = (u64)-1;
1734 fs_info->metadata_alloc_profile = (u64)-1;
1735 fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
Chris Masona74a4b92008-06-25 16:01:31 -04001736 fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root,
1737 "btrfs-cleaner");
Qinghuang Feng57506d52009-01-21 10:49:16 -05001738 if (IS_ERR(fs_info->cleaner_kthread))
Chris Masond20f7042008-12-08 16:58:54 -05001739 goto fail_csum_root;
Chris Masona74a4b92008-06-25 16:01:31 -04001740
1741 fs_info->transaction_kthread = kthread_run(transaction_kthread,
1742 tree_root,
1743 "btrfs-transaction");
Qinghuang Feng57506d52009-01-21 10:49:16 -05001744 if (IS_ERR(fs_info->transaction_kthread))
Chris Mason3f157a22008-06-25 16:01:31 -04001745 goto fail_cleaner;
Chris Masona74a4b92008-06-25 16:01:31 -04001746
Chris Masone02119d2008-09-05 16:13:11 -04001747 if (btrfs_super_log_root(disk_super) != 0) {
Chris Masone02119d2008-09-05 16:13:11 -04001748 u64 bytenr = btrfs_super_log_root(disk_super);
Chris Masond18a2c42008-04-04 15:40:00 -04001749
Chris Mason7c2ca462008-11-19 15:13:35 -05001750 if (fs_devices->rw_devices == 0) {
Chris Masond3977122009-01-05 21:25:51 -05001751 printk(KERN_WARNING "Btrfs log replay required "
1752 "on RO media\n");
Chris Mason7c2ca462008-11-19 15:13:35 -05001753 err = -EIO;
1754 goto fail_trans_kthread;
1755 }
Chris Masone02119d2008-09-05 16:13:11 -04001756 blocksize =
1757 btrfs_level_size(tree_root,
1758 btrfs_super_log_root_level(disk_super));
1759
1760 log_tree_root = kzalloc(sizeof(struct btrfs_root),
1761 GFP_NOFS);
1762
1763 __setup_root(nodesize, leafsize, sectorsize, stripesize,
1764 log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
1765
1766 log_tree_root->node = read_tree_block(tree_root, bytenr,
Yan Zheng84234f32008-10-29 14:49:05 -04001767 blocksize,
1768 generation + 1);
Chris Masone02119d2008-09-05 16:13:11 -04001769 ret = btrfs_recover_log_trees(log_tree_root);
1770 BUG_ON(ret);
Yan Zhenge556ce22008-11-20 10:25:19 -05001771
1772 if (sb->s_flags & MS_RDONLY) {
1773 ret = btrfs_commit_super(tree_root);
1774 BUG_ON(ret);
1775 }
Chris Masone02119d2008-09-05 16:13:11 -04001776 }
Zheng Yan1a40e232008-09-26 10:09:34 -04001777
Chris Mason7c2ca462008-11-19 15:13:35 -05001778 if (!(sb->s_flags & MS_RDONLY)) {
1779 ret = btrfs_cleanup_reloc_trees(tree_root);
1780 BUG_ON(ret);
1781 }
Zheng Yan1a40e232008-09-26 10:09:34 -04001782
Chris Mason3de45862008-11-17 21:02:50 -05001783 location.objectid = BTRFS_FS_TREE_OBJECTID;
1784 location.type = BTRFS_ROOT_ITEM_KEY;
1785 location.offset = (u64)-1;
1786
Chris Mason3de45862008-11-17 21:02:50 -05001787 fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location);
1788 if (!fs_info->fs_root)
Chris Mason7c2ca462008-11-19 15:13:35 -05001789 goto fail_trans_kthread;
Chris Mason0f7d52f2007-04-09 10:42:37 -04001790 return tree_root;
Chris Mason39279cc2007-06-12 06:35:45 -04001791
Chris Mason7c2ca462008-11-19 15:13:35 -05001792fail_trans_kthread:
1793 kthread_stop(fs_info->transaction_kthread);
Chris Mason3f157a22008-06-25 16:01:31 -04001794fail_cleaner:
Chris Masona74a4b92008-06-25 16:01:31 -04001795 kthread_stop(fs_info->cleaner_kthread);
Chris Mason7c2ca462008-11-19 15:13:35 -05001796
1797 /*
1798 * make sure we're done with the btree inode before we stop our
1799 * kthreads
1800 */
1801 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
1802 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
1803
Chris Masond20f7042008-12-08 16:58:54 -05001804fail_csum_root:
1805 free_extent_buffer(csum_root->node);
Chris Mason0b86a832008-03-24 15:01:56 -04001806fail_extent_root:
1807 free_extent_buffer(extent_root->node);
Chris Mason39279cc2007-06-12 06:35:45 -04001808fail_tree_root:
Chris Mason5f39d392007-10-15 16:14:19 -04001809 free_extent_buffer(tree_root->node);
Yan Zheng2b820322008-11-17 21:11:30 -05001810fail_chunk_root:
1811 free_extent_buffer(chunk_root->node);
Chris Mason84eed902008-04-25 09:04:37 -04001812fail_sys_array:
Chris Mason7c2ca462008-11-19 15:13:35 -05001813 free_extent_buffer(dev_root->node);
Chris Mason39279cc2007-06-12 06:35:45 -04001814fail_sb_buffer:
Chris Mason247e7432008-07-17 12:53:51 -04001815 btrfs_stop_workers(&fs_info->fixup_workers);
Chris Mason771ed682008-11-06 22:02:51 -05001816 btrfs_stop_workers(&fs_info->delalloc_workers);
Chris Mason8b712842008-06-11 16:50:36 -04001817 btrfs_stop_workers(&fs_info->workers);
1818 btrfs_stop_workers(&fs_info->endio_workers);
Chris Masond20f7042008-12-08 16:58:54 -05001819 btrfs_stop_workers(&fs_info->endio_meta_workers);
Chris Masoncad321a2008-12-17 14:51:42 -05001820 btrfs_stop_workers(&fs_info->endio_meta_write_workers);
Chris Masone6dcd2d2008-07-17 12:53:50 -04001821 btrfs_stop_workers(&fs_info->endio_write_workers);
Chris Mason1cc127b2008-06-12 14:46:17 -04001822 btrfs_stop_workers(&fs_info->submit_workers);
Chris Mason4543df72008-06-11 21:47:56 -04001823fail_iput:
Chris Mason7c2ca462008-11-19 15:13:35 -05001824 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
Chris Mason4543df72008-06-11 21:47:56 -04001825 iput(fs_info->btree_inode);
Chris Mason39279cc2007-06-12 06:35:45 -04001826fail:
Chris Masondfe25022008-05-13 13:46:40 -04001827 btrfs_close_devices(fs_info->fs_devices);
Chris Mason84eed902008-04-25 09:04:37 -04001828 btrfs_mapping_tree_free(&fs_info->mapping_tree);
1829
Chris Mason39279cc2007-06-12 06:35:45 -04001830 kfree(extent_root);
1831 kfree(tree_root);
Chris Mason2d2ae542008-03-26 16:24:23 -04001832 bdi_destroy(&fs_info->bdi);
Chris Mason39279cc2007-06-12 06:35:45 -04001833 kfree(fs_info);
Jim Meyering83afeac2008-10-01 19:09:51 -04001834 kfree(chunk_root);
1835 kfree(dev_root);
Chris Masond20f7042008-12-08 16:58:54 -05001836 kfree(csum_root);
Chris Mason39279cc2007-06-12 06:35:45 -04001837 return ERR_PTR(err);
Chris Masoneb60cea2007-02-02 09:18:22 -05001838}
1839
Chris Masonf2984462008-04-10 16:19:33 -04001840static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
1841{
1842 char b[BDEVNAME_SIZE];
1843
1844 if (uptodate) {
1845 set_buffer_uptodate(bh);
1846 } else {
1847 if (!buffer_eopnotsupp(bh) && printk_ratelimit()) {
1848 printk(KERN_WARNING "lost page write due to "
1849 "I/O error on %s\n",
1850 bdevname(bh->b_bdev, b));
1851 }
Chris Mason1259ab72008-05-12 13:39:03 -04001852 /* note, we dont' set_buffer_write_io_error because we have
1853 * our own ways of dealing with the IO errors
1854 */
Chris Masonf2984462008-04-10 16:19:33 -04001855 clear_buffer_uptodate(bh);
1856 }
1857 unlock_buffer(bh);
1858 put_bh(bh);
1859}
1860
Yan Zhenga512bbf2008-12-08 16:46:26 -05001861struct buffer_head *btrfs_read_dev_super(struct block_device *bdev)
1862{
1863 struct buffer_head *bh;
1864 struct buffer_head *latest = NULL;
1865 struct btrfs_super_block *super;
1866 int i;
1867 u64 transid = 0;
1868 u64 bytenr;
1869
1870 /* we would like to check all the supers, but that would make
1871 * a btrfs mount succeed after a mkfs from a different FS.
1872 * So, we need to add a special mount option to scan for
1873 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
1874 */
1875 for (i = 0; i < 1; i++) {
1876 bytenr = btrfs_sb_offset(i);
1877 if (bytenr + 4096 >= i_size_read(bdev->bd_inode))
1878 break;
1879 bh = __bread(bdev, bytenr / 4096, 4096);
1880 if (!bh)
1881 continue;
1882
1883 super = (struct btrfs_super_block *)bh->b_data;
1884 if (btrfs_super_bytenr(super) != bytenr ||
1885 strncmp((char *)(&super->magic), BTRFS_MAGIC,
1886 sizeof(super->magic))) {
1887 brelse(bh);
1888 continue;
1889 }
1890
1891 if (!latest || btrfs_super_generation(super) > transid) {
1892 brelse(latest);
1893 latest = bh;
1894 transid = btrfs_super_generation(super);
1895 } else {
1896 brelse(bh);
1897 }
1898 }
1899 return latest;
1900}
1901
1902static int write_dev_supers(struct btrfs_device *device,
1903 struct btrfs_super_block *sb,
1904 int do_barriers, int wait, int max_mirrors)
1905{
1906 struct buffer_head *bh;
1907 int i;
1908 int ret;
1909 int errors = 0;
1910 u32 crc;
1911 u64 bytenr;
1912 int last_barrier = 0;
1913
1914 if (max_mirrors == 0)
1915 max_mirrors = BTRFS_SUPER_MIRROR_MAX;
1916
1917 /* make sure only the last submit_bh does a barrier */
1918 if (do_barriers) {
1919 for (i = 0; i < max_mirrors; i++) {
1920 bytenr = btrfs_sb_offset(i);
1921 if (bytenr + BTRFS_SUPER_INFO_SIZE >=
1922 device->total_bytes)
1923 break;
1924 last_barrier = i;
1925 }
1926 }
1927
1928 for (i = 0; i < max_mirrors; i++) {
1929 bytenr = btrfs_sb_offset(i);
1930 if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes)
1931 break;
1932
1933 if (wait) {
1934 bh = __find_get_block(device->bdev, bytenr / 4096,
1935 BTRFS_SUPER_INFO_SIZE);
1936 BUG_ON(!bh);
1937 brelse(bh);
1938 wait_on_buffer(bh);
1939 if (buffer_uptodate(bh)) {
1940 brelse(bh);
1941 continue;
1942 }
1943 } else {
1944 btrfs_set_super_bytenr(sb, bytenr);
1945
1946 crc = ~(u32)0;
1947 crc = btrfs_csum_data(NULL, (char *)sb +
1948 BTRFS_CSUM_SIZE, crc,
1949 BTRFS_SUPER_INFO_SIZE -
1950 BTRFS_CSUM_SIZE);
1951 btrfs_csum_final(crc, sb->csum);
1952
1953 bh = __getblk(device->bdev, bytenr / 4096,
1954 BTRFS_SUPER_INFO_SIZE);
1955 memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
1956
1957 set_buffer_uptodate(bh);
1958 get_bh(bh);
1959 lock_buffer(bh);
1960 bh->b_end_io = btrfs_end_buffer_write_sync;
1961 }
1962
1963 if (i == last_barrier && do_barriers && device->barriers) {
1964 ret = submit_bh(WRITE_BARRIER, bh);
1965 if (ret == -EOPNOTSUPP) {
1966 printk("btrfs: disabling barriers on dev %s\n",
1967 device->name);
1968 set_buffer_uptodate(bh);
1969 device->barriers = 0;
1970 get_bh(bh);
1971 lock_buffer(bh);
1972 ret = submit_bh(WRITE, bh);
1973 }
1974 } else {
1975 ret = submit_bh(WRITE, bh);
1976 }
1977
1978 if (!ret && wait) {
1979 wait_on_buffer(bh);
1980 if (!buffer_uptodate(bh))
1981 errors++;
1982 } else if (ret) {
1983 errors++;
1984 }
1985 if (wait)
1986 brelse(bh);
1987 }
1988 return errors < i ? 0 : -1;
1989}
1990
1991int write_all_supers(struct btrfs_root *root, int max_mirrors)
Chris Masonf2984462008-04-10 16:19:33 -04001992{
Chris Masonf2984462008-04-10 16:19:33 -04001993 struct list_head *head = &root->fs_info->fs_devices->devices;
1994 struct btrfs_device *dev;
Chris Masona061fc82008-05-07 11:43:44 -04001995 struct btrfs_super_block *sb;
Chris Masonf2984462008-04-10 16:19:33 -04001996 struct btrfs_dev_item *dev_item;
Chris Masonf2984462008-04-10 16:19:33 -04001997 int ret;
1998 int do_barriers;
Chris Masona236aed2008-04-29 09:38:00 -04001999 int max_errors;
2000 int total_errors = 0;
Chris Masona061fc82008-05-07 11:43:44 -04002001 u64 flags;
Chris Masonf2984462008-04-10 16:19:33 -04002002
Chris Masona236aed2008-04-29 09:38:00 -04002003 max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1;
Chris Masonf2984462008-04-10 16:19:33 -04002004 do_barriers = !btrfs_test_opt(root, NOBARRIER);
2005
Chris Masona061fc82008-05-07 11:43:44 -04002006 sb = &root->fs_info->super_for_commit;
2007 dev_item = &sb->dev_item;
Qinghuang Fengc6e30872009-01-21 10:59:08 -05002008 list_for_each_entry(dev, head, dev_list) {
Chris Masondfe25022008-05-13 13:46:40 -04002009 if (!dev->bdev) {
2010 total_errors++;
2011 continue;
2012 }
Yan Zheng2b820322008-11-17 21:11:30 -05002013 if (!dev->in_fs_metadata || !dev->writeable)
Chris Masondfe25022008-05-13 13:46:40 -04002014 continue;
2015
Yan Zheng2b820322008-11-17 21:11:30 -05002016 btrfs_set_stack_device_generation(dev_item, 0);
Chris Masona061fc82008-05-07 11:43:44 -04002017 btrfs_set_stack_device_type(dev_item, dev->type);
2018 btrfs_set_stack_device_id(dev_item, dev->devid);
2019 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
2020 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
2021 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
2022 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
2023 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
2024 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
Yan Zheng2b820322008-11-17 21:11:30 -05002025 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
Yan Zhenga512bbf2008-12-08 16:46:26 -05002026
Chris Masona061fc82008-05-07 11:43:44 -04002027 flags = btrfs_super_flags(sb);
2028 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
Chris Masonf2984462008-04-10 16:19:33 -04002029
Yan Zhenga512bbf2008-12-08 16:46:26 -05002030 ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors);
Chris Masona236aed2008-04-29 09:38:00 -04002031 if (ret)
2032 total_errors++;
Chris Masonf2984462008-04-10 16:19:33 -04002033 }
Chris Masona236aed2008-04-29 09:38:00 -04002034 if (total_errors > max_errors) {
Chris Masond3977122009-01-05 21:25:51 -05002035 printk(KERN_ERR "btrfs: %d errors while writing supers\n",
2036 total_errors);
Chris Masona236aed2008-04-29 09:38:00 -04002037 BUG();
2038 }
Chris Masonf2984462008-04-10 16:19:33 -04002039
Yan Zhenga512bbf2008-12-08 16:46:26 -05002040 total_errors = 0;
Qinghuang Fengc6e30872009-01-21 10:59:08 -05002041 list_for_each_entry(dev, head, dev_list) {
Chris Masondfe25022008-05-13 13:46:40 -04002042 if (!dev->bdev)
2043 continue;
Yan Zheng2b820322008-11-17 21:11:30 -05002044 if (!dev->in_fs_metadata || !dev->writeable)
Chris Masondfe25022008-05-13 13:46:40 -04002045 continue;
2046
Yan Zhenga512bbf2008-12-08 16:46:26 -05002047 ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors);
2048 if (ret)
2049 total_errors++;
Chris Masonf2984462008-04-10 16:19:33 -04002050 }
Chris Masona236aed2008-04-29 09:38:00 -04002051 if (total_errors > max_errors) {
Chris Masond3977122009-01-05 21:25:51 -05002052 printk(KERN_ERR "btrfs: %d errors while writing supers\n",
2053 total_errors);
Chris Masona236aed2008-04-29 09:38:00 -04002054 BUG();
2055 }
Chris Masonf2984462008-04-10 16:19:33 -04002056 return 0;
2057}
2058
Yan Zhenga512bbf2008-12-08 16:46:26 -05002059int write_ctree_super(struct btrfs_trans_handle *trans,
2060 struct btrfs_root *root, int max_mirrors)
Chris Masoncfaa7292007-02-21 17:04:57 -05002061{
Chris Masone66f7092007-04-20 13:16:02 -04002062 int ret;
Chris Mason2c90e5d2007-04-02 10:50:19 -04002063
Yan Zhenga512bbf2008-12-08 16:46:26 -05002064 ret = write_all_supers(root, max_mirrors);
Chris Mason5f39d392007-10-15 16:14:19 -04002065 return ret;
Chris Masoncfaa7292007-02-21 17:04:57 -05002066}
2067
Chris Mason5eda7b52007-06-22 14:16:25 -04002068int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
Chris Mason2619ba12007-04-10 16:58:11 -04002069{
2070 radix_tree_delete(&fs_info->fs_roots_radix,
2071 (unsigned long)root->root_key.objectid);
Chris Mason3394e162008-11-17 20:42:26 -05002072 if (root->anon_super.s_dev) {
2073 down_write(&root->anon_super.s_umount);
2074 kill_anon_super(&root->anon_super);
2075 }
Chris Mason2619ba12007-04-10 16:58:11 -04002076 if (root->node)
Chris Mason5f39d392007-10-15 16:14:19 -04002077 free_extent_buffer(root->node);
Chris Mason2619ba12007-04-10 16:58:11 -04002078 if (root->commit_root)
Chris Mason5f39d392007-10-15 16:14:19 -04002079 free_extent_buffer(root->commit_root);
Chris Masond3977122009-01-05 21:25:51 -05002080 kfree(root->name);
Chris Mason2619ba12007-04-10 16:58:11 -04002081 kfree(root);
2082 return 0;
2083}
2084
Chris Mason35b7e472007-05-02 15:53:43 -04002085static int del_fs_roots(struct btrfs_fs_info *fs_info)
Chris Mason0f7d52f2007-04-09 10:42:37 -04002086{
2087 int ret;
2088 struct btrfs_root *gang[8];
2089 int i;
2090
Chris Masond3977122009-01-05 21:25:51 -05002091 while (1) {
Chris Mason0f7d52f2007-04-09 10:42:37 -04002092 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
2093 (void **)gang, 0,
2094 ARRAY_SIZE(gang));
2095 if (!ret)
2096 break;
Chris Mason2619ba12007-04-10 16:58:11 -04002097 for (i = 0; i < ret; i++)
Chris Mason5eda7b52007-06-22 14:16:25 -04002098 btrfs_free_fs_root(fs_info, gang[i]);
Chris Mason0f7d52f2007-04-09 10:42:37 -04002099 }
2100 return 0;
2101}
Chris Masonb4100d62007-04-12 12:14:00 -04002102
Yan Zhengc146afa2008-11-12 14:34:12 -05002103int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
2104{
2105 u64 root_objectid = 0;
2106 struct btrfs_root *gang[8];
2107 int i;
2108 int ret;
2109
2110 while (1) {
2111 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
2112 (void **)gang, root_objectid,
2113 ARRAY_SIZE(gang));
2114 if (!ret)
2115 break;
2116 for (i = 0; i < ret; i++) {
2117 root_objectid = gang[i]->root_key.objectid;
2118 ret = btrfs_find_dead_roots(fs_info->tree_root,
2119 root_objectid, gang[i]);
2120 BUG_ON(ret);
2121 btrfs_orphan_cleanup(gang[i]);
2122 }
2123 root_objectid++;
2124 }
2125 return 0;
2126}
2127
2128int btrfs_commit_super(struct btrfs_root *root)
2129{
2130 struct btrfs_trans_handle *trans;
2131 int ret;
2132
2133 mutex_lock(&root->fs_info->cleaner_mutex);
2134 btrfs_clean_old_snapshots(root);
2135 mutex_unlock(&root->fs_info->cleaner_mutex);
2136 trans = btrfs_start_transaction(root, 1);
2137 ret = btrfs_commit_transaction(trans, root);
2138 BUG_ON(ret);
2139 /* run commit again to drop the original snapshot */
2140 trans = btrfs_start_transaction(root, 1);
2141 btrfs_commit_transaction(trans, root);
2142 ret = btrfs_write_and_wait_transaction(NULL, root);
2143 BUG_ON(ret);
2144
Yan Zhenga512bbf2008-12-08 16:46:26 -05002145 ret = write_ctree_super(NULL, root, 0);
Yan Zhengc146afa2008-11-12 14:34:12 -05002146 return ret;
2147}
2148
Chris Masone20d96d2007-03-22 12:13:20 -04002149int close_ctree(struct btrfs_root *root)
Chris Masoneb60cea2007-02-02 09:18:22 -05002150{
Chris Mason0f7d52f2007-04-09 10:42:37 -04002151 struct btrfs_fs_info *fs_info = root->fs_info;
Yan Zhengc146afa2008-11-12 14:34:12 -05002152 int ret;
Chris Masone089f052007-03-16 16:20:31 -04002153
Chris Masonfacda1e2007-06-08 18:11:48 -04002154 fs_info->closing = 1;
Chris Masona2135012008-06-25 16:01:30 -04002155 smp_mb();
2156
Chris Masona74a4b92008-06-25 16:01:31 -04002157 kthread_stop(root->fs_info->transaction_kthread);
2158 kthread_stop(root->fs_info->cleaner_kthread);
2159
Yan Zhengc146afa2008-11-12 14:34:12 -05002160 if (!(fs_info->sb->s_flags & MS_RDONLY)) {
2161 ret = btrfs_commit_super(root);
Chris Masond3977122009-01-05 21:25:51 -05002162 if (ret)
2163 printk(KERN_ERR "btrfs: commit super ret %d\n", ret);
Yan Zhengc146afa2008-11-12 14:34:12 -05002164 }
Chris Masoned2ff2c2007-03-01 18:59:40 -05002165
Chris Masonb0c68f82008-01-31 11:05:37 -05002166 if (fs_info->delalloc_bytes) {
Chris Masond3977122009-01-05 21:25:51 -05002167 printk(KERN_INFO "btrfs: at unmount delalloc count %llu\n",
Chris Masonb0c68f82008-01-31 11:05:37 -05002168 fs_info->delalloc_bytes);
2169 }
Yan Zheng31153d82008-07-28 15:32:19 -04002170 if (fs_info->total_ref_cache_size) {
Chris Masond3977122009-01-05 21:25:51 -05002171 printk(KERN_INFO "btrfs: at umount reference cache size %llu\n",
2172 (unsigned long long)fs_info->total_ref_cache_size);
Yan Zheng31153d82008-07-28 15:32:19 -04002173 }
Yanbcc63ab2008-07-30 16:29:20 -04002174
Chris Mason0f7d52f2007-04-09 10:42:37 -04002175 if (fs_info->extent_root->node)
Chris Mason5f39d392007-10-15 16:14:19 -04002176 free_extent_buffer(fs_info->extent_root->node);
Chris Masonf510cfe2007-10-15 16:14:48 -04002177
Chris Mason0f7d52f2007-04-09 10:42:37 -04002178 if (fs_info->tree_root->node)
Chris Mason5f39d392007-10-15 16:14:19 -04002179 free_extent_buffer(fs_info->tree_root->node);
Chris Masonf510cfe2007-10-15 16:14:48 -04002180
Chris Masond3977122009-01-05 21:25:51 -05002181 if (root->fs_info->chunk_root->node)
Chris Mason0b86a832008-03-24 15:01:56 -04002182 free_extent_buffer(root->fs_info->chunk_root->node);
2183
Chris Masond3977122009-01-05 21:25:51 -05002184 if (root->fs_info->dev_root->node)
Chris Mason0b86a832008-03-24 15:01:56 -04002185 free_extent_buffer(root->fs_info->dev_root->node);
2186
Chris Masond3977122009-01-05 21:25:51 -05002187 if (root->fs_info->csum_root->node)
Chris Masond20f7042008-12-08 16:58:54 -05002188 free_extent_buffer(root->fs_info->csum_root->node);
2189
Chris Mason9078a3e2007-04-26 16:46:15 -04002190 btrfs_free_block_groups(root->fs_info);
Yan Zhengc146afa2008-11-12 14:34:12 -05002191
Chris Mason0f7d52f2007-04-09 10:42:37 -04002192 del_fs_roots(fs_info);
Chris Masond10c5f32007-12-17 20:14:04 -05002193
Yan Zhengc146afa2008-11-12 14:34:12 -05002194 iput(fs_info->btree_inode);
Chris Mason9ad6b7b2008-04-18 16:11:30 -04002195
Chris Mason247e7432008-07-17 12:53:51 -04002196 btrfs_stop_workers(&fs_info->fixup_workers);
Chris Mason771ed682008-11-06 22:02:51 -05002197 btrfs_stop_workers(&fs_info->delalloc_workers);
Chris Mason8b712842008-06-11 16:50:36 -04002198 btrfs_stop_workers(&fs_info->workers);
2199 btrfs_stop_workers(&fs_info->endio_workers);
Chris Masond20f7042008-12-08 16:58:54 -05002200 btrfs_stop_workers(&fs_info->endio_meta_workers);
Chris Masoncad321a2008-12-17 14:51:42 -05002201 btrfs_stop_workers(&fs_info->endio_meta_write_workers);
Chris Masone6dcd2d2008-07-17 12:53:50 -04002202 btrfs_stop_workers(&fs_info->endio_write_workers);
Chris Mason1cc127b2008-06-12 14:46:17 -04002203 btrfs_stop_workers(&fs_info->submit_workers);
Chris Masond6bfde82008-04-30 13:59:35 -04002204
Chris Mason19c00dd2007-10-15 16:19:22 -04002205#if 0
Chris Masond3977122009-01-05 21:25:51 -05002206 while (!list_empty(&fs_info->hashers)) {
Chris Mason19c00dd2007-10-15 16:19:22 -04002207 struct btrfs_hasher *hasher;
2208 hasher = list_entry(fs_info->hashers.next, struct btrfs_hasher,
2209 hashers);
2210 list_del(&hasher->hashers);
2211 crypto_free_hash(&fs_info->hash_tfm);
2212 kfree(hasher);
2213 }
2214#endif
Chris Masondfe25022008-05-13 13:46:40 -04002215 btrfs_close_devices(fs_info->fs_devices);
Chris Mason0b86a832008-03-24 15:01:56 -04002216 btrfs_mapping_tree_free(&fs_info->mapping_tree);
Chris Masonb248a412008-04-14 09:48:18 -04002217
Chris Mason04160082008-03-26 10:28:07 -04002218 bdi_destroy(&fs_info->bdi);
Chris Mason0b86a832008-03-24 15:01:56 -04002219
Chris Mason0f7d52f2007-04-09 10:42:37 -04002220 kfree(fs_info->extent_root);
Chris Mason0f7d52f2007-04-09 10:42:37 -04002221 kfree(fs_info->tree_root);
Chris Mason0b86a832008-03-24 15:01:56 -04002222 kfree(fs_info->chunk_root);
2223 kfree(fs_info->dev_root);
Chris Masond20f7042008-12-08 16:58:54 -05002224 kfree(fs_info->csum_root);
Chris Masoneb60cea2007-02-02 09:18:22 -05002225 return 0;
2226}
2227
Chris Mason1259ab72008-05-12 13:39:03 -04002228int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
Chris Masonccd467d2007-06-28 15:57:36 -04002229{
Chris Mason1259ab72008-05-12 13:39:03 -04002230 int ret;
Chris Mason810191f2007-10-15 16:18:55 -04002231 struct inode *btree_inode = buf->first_page->mapping->host;
Chris Mason1259ab72008-05-12 13:39:03 -04002232
2233 ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf);
2234 if (!ret)
2235 return ret;
2236
2237 ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf,
2238 parent_transid);
2239 return !ret;
Chris Mason5f39d392007-10-15 16:14:19 -04002240}
Chris Mason6702ed42007-08-07 16:15:09 -04002241
Chris Mason5f39d392007-10-15 16:14:19 -04002242int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
2243{
Chris Mason810191f2007-10-15 16:18:55 -04002244 struct inode *btree_inode = buf->first_page->mapping->host;
Chris Masond1310b22008-01-24 16:13:08 -05002245 return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree,
Chris Mason5f39d392007-10-15 16:14:19 -04002246 buf);
2247}
2248
2249void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
2250{
Chris Mason810191f2007-10-15 16:18:55 -04002251 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
Chris Mason5f39d392007-10-15 16:14:19 -04002252 u64 transid = btrfs_header_generation(buf);
2253 struct inode *btree_inode = root->fs_info->btree_inode;
Chris Mason6702ed42007-08-07 16:15:09 -04002254
Chris Mason925baed2008-06-25 16:01:30 -04002255 WARN_ON(!btrfs_tree_locked(buf));
Chris Masonccd467d2007-06-28 15:57:36 -04002256 if (transid != root->fs_info->generation) {
Chris Masond3977122009-01-05 21:25:51 -05002257 printk(KERN_CRIT "btrfs transid mismatch buffer %llu, "
2258 "found %llu running %llu\n",
Chris Masondb945352007-10-15 16:15:53 -04002259 (unsigned long long)buf->start,
Chris Masond3977122009-01-05 21:25:51 -05002260 (unsigned long long)transid,
2261 (unsigned long long)root->fs_info->generation);
Chris Masonccd467d2007-06-28 15:57:36 -04002262 WARN_ON(1);
2263 }
Chris Masond1310b22008-01-24 16:13:08 -05002264 set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, buf);
Chris Masoneb60cea2007-02-02 09:18:22 -05002265}
2266
Chris Masond3c2fdcf2007-09-17 10:58:06 -04002267void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
Chris Mason35b7e472007-05-02 15:53:43 -04002268{
Chris Mason188de642008-05-09 11:52:25 -04002269 /*
2270 * looks as though older kernels can get into trouble with
2271 * this code, they end up stuck in balance_dirty_pages forever
2272 */
Chris Masond6bfde82008-04-30 13:59:35 -04002273 struct extent_io_tree *tree;
2274 u64 num_dirty;
2275 u64 start = 0;
Chris Mason771ed682008-11-06 22:02:51 -05002276 unsigned long thresh = 32 * 1024 * 1024;
Chris Masond6bfde82008-04-30 13:59:35 -04002277 tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
2278
Chris Masonb64a2852008-08-20 13:39:41 -04002279 if (current_is_pdflush() || current->flags & PF_MEMALLOC)
Chris Masond6bfde82008-04-30 13:59:35 -04002280 return;
2281
2282 num_dirty = count_range_bits(tree, &start, (u64)-1,
2283 thresh, EXTENT_DIRTY);
2284 if (num_dirty > thresh) {
2285 balance_dirty_pages_ratelimited_nr(
Chris Masond7fc6402008-02-18 12:12:38 -05002286 root->fs_info->btree_inode->i_mapping, 1);
Chris Masond6bfde82008-04-30 13:59:35 -04002287 }
Chris Mason188de642008-05-09 11:52:25 -04002288 return;
Chris Mason35b7e472007-05-02 15:53:43 -04002289}
Chris Mason6b800532007-10-15 16:17:34 -04002290
Chris Masonca7a79a2008-05-12 12:59:19 -04002291int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid)
Chris Mason6b800532007-10-15 16:17:34 -04002292{
Chris Mason810191f2007-10-15 16:18:55 -04002293 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
Chris Masonce9adaa2008-04-09 16:28:12 -04002294 int ret;
Chris Masonca7a79a2008-05-12 12:59:19 -04002295 ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
Chris Masond3977122009-01-05 21:25:51 -05002296 if (ret == 0)
Chris Masonce9adaa2008-04-09 16:28:12 -04002297 buf->flags |= EXTENT_UPTODATE;
Chris Masonce9adaa2008-04-09 16:28:12 -04002298 return ret;
Chris Mason6b800532007-10-15 16:17:34 -04002299}
Chris Mason0da54682007-11-07 21:08:01 -05002300
Chris Mason4bef0842008-09-08 11:18:08 -04002301int btree_lock_page_hook(struct page *page)
2302{
2303 struct inode *inode = page->mapping->host;
2304 struct btrfs_root *root = BTRFS_I(inode)->root;
2305 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2306 struct extent_buffer *eb;
2307 unsigned long len;
2308 u64 bytenr = page_offset(page);
2309
2310 if (page->private == EXTENT_PAGE_PRIVATE)
2311 goto out;
2312
2313 len = page->private >> 2;
2314 eb = find_extent_buffer(io_tree, bytenr, len, GFP_NOFS);
2315 if (!eb)
2316 goto out;
2317
2318 btrfs_tree_lock(eb);
2319 spin_lock(&root->fs_info->hash_lock);
2320 btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
2321 spin_unlock(&root->fs_info->hash_lock);
2322 btrfs_tree_unlock(eb);
2323 free_extent_buffer(eb);
2324out:
2325 lock_page(page);
2326 return 0;
2327}
2328
Chris Masond1310b22008-01-24 16:13:08 -05002329static struct extent_io_ops btree_extent_io_ops = {
Chris Mason4bef0842008-09-08 11:18:08 -04002330 .write_cache_pages_lock_hook = btree_lock_page_hook,
Chris Masonce9adaa2008-04-09 16:28:12 -04002331 .readpage_end_io_hook = btree_readpage_end_io_hook,
Chris Mason0b86a832008-03-24 15:01:56 -04002332 .submit_bio_hook = btree_submit_bio_hook,
Chris Mason239b14b2008-03-24 15:02:07 -04002333 /* note we're sharing with inode.c for the merge bio hook */
2334 .merge_bio_hook = btrfs_merge_bio_hook,
Chris Mason0da54682007-11-07 21:08:01 -05002335};