blob: af0435f79fa605e96f0461efd496599c576eb7e2 [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>
David Woodhouse163e7832009-04-19 13:02:41 +010029#include <linux/crc32c.h>
Chris Mason4b4e25f2008-11-20 10:22:27 -050030#include "compat.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 Masone02119d2008-09-05 16:13:11 -040039#include "tree-log.h"
Chris Masonfa9c0d72009-04-03 09:47:43 -040040#include "free-space-cache.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);
Yan, Zheng4df27c4d2009-09-21 15:56:00 -040044static void free_fs_root(struct btrfs_root *root);
Chris Masonce9adaa2008-04-09 16:28:12 -040045
Jens Axboead081f12009-06-12 14:43:40 +020046static atomic_t btrfs_bdi_num = ATOMIC_INIT(0);
47
Chris Masond352ac62008-09-29 15:18:18 -040048/*
49 * end_io_wq structs are used to do processing in task context when an IO is
50 * complete. This is used during reads to verify checksums, and it is used
51 * by writes to insert metadata for new file extents after IO is complete.
52 */
Chris Masonce9adaa2008-04-09 16:28:12 -040053struct end_io_wq {
54 struct bio *bio;
55 bio_end_io_t *end_io;
56 void *private;
57 struct btrfs_fs_info *info;
58 int error;
Chris Mason22c59942008-04-09 16:28:12 -040059 int metadata;
Chris Masonce9adaa2008-04-09 16:28:12 -040060 struct list_head list;
Chris Mason8b712842008-06-11 16:50:36 -040061 struct btrfs_work work;
Chris Masonce9adaa2008-04-09 16:28:12 -040062};
Chris Mason0da54682007-11-07 21:08:01 -050063
Chris Masond352ac62008-09-29 15:18:18 -040064/*
65 * async submit bios are used to offload expensive checksumming
66 * onto the worker threads. They checksum file and metadata bios
67 * just before they are sent down the IO stack.
68 */
Chris Mason44b8bd72008-04-16 11:14:51 -040069struct async_submit_bio {
70 struct inode *inode;
71 struct bio *bio;
72 struct list_head list;
Chris Mason4a69a412008-11-06 22:03:00 -050073 extent_submit_bio_hook_t *submit_bio_start;
74 extent_submit_bio_hook_t *submit_bio_done;
Chris Mason44b8bd72008-04-16 11:14:51 -040075 int rw;
76 int mirror_num;
Chris Masonc8b97812008-10-29 14:49:59 -040077 unsigned long bio_flags;
Chris Mason8b712842008-06-11 16:50:36 -040078 struct btrfs_work work;
Chris Mason44b8bd72008-04-16 11:14:51 -040079};
80
Chris Mason4008c042009-02-12 14:09:45 -050081/* These are used to set the lockdep class on the extent buffer locks.
82 * The class is set by the readpage_end_io_hook after the buffer has
83 * passed csum validation but before the pages are unlocked.
84 *
85 * The lockdep class is also set by btrfs_init_new_buffer on freshly
86 * allocated blocks.
87 *
88 * The class is based on the level in the tree block, which allows lockdep
89 * to know that lower nodes nest inside the locks of higher nodes.
90 *
91 * We also add a check to make sure the highest level of the tree is
92 * the same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this
93 * code needs update as well.
94 */
95#ifdef CONFIG_DEBUG_LOCK_ALLOC
96# if BTRFS_MAX_LEVEL != 8
97# error
98# endif
99static struct lock_class_key btrfs_eb_class[BTRFS_MAX_LEVEL + 1];
100static const char *btrfs_eb_name[BTRFS_MAX_LEVEL + 1] = {
101 /* leaf */
102 "btrfs-extent-00",
103 "btrfs-extent-01",
104 "btrfs-extent-02",
105 "btrfs-extent-03",
106 "btrfs-extent-04",
107 "btrfs-extent-05",
108 "btrfs-extent-06",
109 "btrfs-extent-07",
110 /* highest possible level */
111 "btrfs-extent-08",
112};
113#endif
114
Chris Masond352ac62008-09-29 15:18:18 -0400115/*
116 * extents on the btree inode are pretty simple, there's one extent
117 * that covers the entire device
118 */
Christoph Hellwigb2950862008-12-02 09:54:17 -0500119static struct extent_map *btree_get_extent(struct inode *inode,
120 struct page *page, size_t page_offset, u64 start, u64 len,
121 int create)
Chris Mason5f39d392007-10-15 16:14:19 -0400122{
123 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
124 struct extent_map *em;
125 int ret;
Chris Masond98237b2007-03-28 13:57:48 -0400126
Chris Mason890871b2009-09-02 16:24:52 -0400127 read_lock(&em_tree->lock);
Chris Masond1310b22008-01-24 16:13:08 -0500128 em = lookup_extent_mapping(em_tree, start, len);
Chris Masona061fc82008-05-07 11:43:44 -0400129 if (em) {
130 em->bdev =
131 BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
Chris Mason890871b2009-09-02 16:24:52 -0400132 read_unlock(&em_tree->lock);
Chris Mason5f39d392007-10-15 16:14:19 -0400133 goto out;
Chris Masona061fc82008-05-07 11:43:44 -0400134 }
Chris Mason890871b2009-09-02 16:24:52 -0400135 read_unlock(&em_tree->lock);
Chris Mason7b13b7b2008-04-18 10:29:50 -0400136
Chris Mason5f39d392007-10-15 16:14:19 -0400137 em = alloc_extent_map(GFP_NOFS);
138 if (!em) {
139 em = ERR_PTR(-ENOMEM);
140 goto out;
141 }
142 em->start = 0;
Chris Mason0afbaf82008-04-18 14:17:20 -0400143 em->len = (u64)-1;
Chris Masonc8b97812008-10-29 14:49:59 -0400144 em->block_len = (u64)-1;
Chris Mason5f39d392007-10-15 16:14:19 -0400145 em->block_start = 0;
Chris Masona061fc82008-05-07 11:43:44 -0400146 em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
Chris Masond1310b22008-01-24 16:13:08 -0500147
Chris Mason890871b2009-09-02 16:24:52 -0400148 write_lock(&em_tree->lock);
Chris Mason5f39d392007-10-15 16:14:19 -0400149 ret = add_extent_mapping(em_tree, em);
150 if (ret == -EEXIST) {
Chris Mason0afbaf82008-04-18 14:17:20 -0400151 u64 failed_start = em->start;
152 u64 failed_len = em->len;
153
Chris Mason5f39d392007-10-15 16:14:19 -0400154 free_extent_map(em);
Chris Mason7b13b7b2008-04-18 10:29:50 -0400155 em = lookup_extent_mapping(em_tree, start, len);
Chris Mason0afbaf82008-04-18 14:17:20 -0400156 if (em) {
Chris Mason7b13b7b2008-04-18 10:29:50 -0400157 ret = 0;
Chris Mason0afbaf82008-04-18 14:17:20 -0400158 } else {
159 em = lookup_extent_mapping(em_tree, failed_start,
160 failed_len);
Chris Mason7b13b7b2008-04-18 10:29:50 -0400161 ret = -EIO;
Chris Mason0afbaf82008-04-18 14:17:20 -0400162 }
Chris Mason5f39d392007-10-15 16:14:19 -0400163 } else if (ret) {
Chris Mason7b13b7b2008-04-18 10:29:50 -0400164 free_extent_map(em);
165 em = NULL;
Chris Mason5f39d392007-10-15 16:14:19 -0400166 }
Chris Mason890871b2009-09-02 16:24:52 -0400167 write_unlock(&em_tree->lock);
Chris Mason7b13b7b2008-04-18 10:29:50 -0400168
169 if (ret)
170 em = ERR_PTR(ret);
Chris Mason5f39d392007-10-15 16:14:19 -0400171out:
172 return em;
173}
174
Chris Mason19c00dd2007-10-15 16:19:22 -0400175u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
176{
David Woodhouse163e7832009-04-19 13:02:41 +0100177 return crc32c(seed, data, len);
Chris Mason19c00dd2007-10-15 16:19:22 -0400178}
179
180void btrfs_csum_final(u32 crc, char *result)
181{
182 *(__le32 *)result = ~cpu_to_le32(crc);
183}
184
Chris Masond352ac62008-09-29 15:18:18 -0400185/*
186 * compute the csum for a btree block, and either verify it or write it
187 * into the csum field of the block.
188 */
Chris Mason19c00dd2007-10-15 16:19:22 -0400189static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
190 int verify)
191{
Josef Bacik607d4322008-12-02 07:17:45 -0500192 u16 csum_size =
193 btrfs_super_csum_size(&root->fs_info->super_copy);
194 char *result = NULL;
Chris Mason19c00dd2007-10-15 16:19:22 -0400195 unsigned long len;
196 unsigned long cur_len;
197 unsigned long offset = BTRFS_CSUM_SIZE;
198 char *map_token = NULL;
199 char *kaddr;
200 unsigned long map_start;
201 unsigned long map_len;
202 int err;
203 u32 crc = ~(u32)0;
Josef Bacik607d4322008-12-02 07:17:45 -0500204 unsigned long inline_result;
Chris Mason19c00dd2007-10-15 16:19:22 -0400205
206 len = buf->len - offset;
Chris Masond3977122009-01-05 21:25:51 -0500207 while (len > 0) {
Chris Mason19c00dd2007-10-15 16:19:22 -0400208 err = map_private_extent_buffer(buf, offset, 32,
209 &map_token, &kaddr,
210 &map_start, &map_len, KM_USER0);
Chris Masond3977122009-01-05 21:25:51 -0500211 if (err)
Chris Mason19c00dd2007-10-15 16:19:22 -0400212 return 1;
Chris Mason19c00dd2007-10-15 16:19:22 -0400213 cur_len = min(len, map_len - (offset - map_start));
214 crc = btrfs_csum_data(root, kaddr + offset - map_start,
215 crc, cur_len);
216 len -= cur_len;
217 offset += cur_len;
218 unmap_extent_buffer(buf, map_token, KM_USER0);
219 }
Josef Bacik607d4322008-12-02 07:17:45 -0500220 if (csum_size > sizeof(inline_result)) {
221 result = kzalloc(csum_size * sizeof(char), GFP_NOFS);
222 if (!result)
223 return 1;
224 } else {
225 result = (char *)&inline_result;
226 }
227
Chris Mason19c00dd2007-10-15 16:19:22 -0400228 btrfs_csum_final(crc, result);
229
230 if (verify) {
Josef Bacik607d4322008-12-02 07:17:45 -0500231 if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
Chris Masone4204de2008-01-08 15:46:27 -0500232 u32 val;
233 u32 found = 0;
Josef Bacik607d4322008-12-02 07:17:45 -0500234 memcpy(&found, result, csum_size);
Chris Masone4204de2008-01-08 15:46:27 -0500235
Josef Bacik607d4322008-12-02 07:17:45 -0500236 read_extent_buffer(buf, &val, 0, csum_size);
Chris Mason193f2842009-04-27 07:29:05 -0400237 if (printk_ratelimit()) {
238 printk(KERN_INFO "btrfs: %s checksum verify "
239 "failed on %llu wanted %X found %X "
240 "level %d\n",
241 root->fs_info->sb->s_id,
242 (unsigned long long)buf->start, val, found,
243 btrfs_header_level(buf));
244 }
Josef Bacik607d4322008-12-02 07:17:45 -0500245 if (result != (char *)&inline_result)
246 kfree(result);
Chris Mason19c00dd2007-10-15 16:19:22 -0400247 return 1;
248 }
249 } else {
Josef Bacik607d4322008-12-02 07:17:45 -0500250 write_extent_buffer(buf, result, 0, csum_size);
Chris Mason19c00dd2007-10-15 16:19:22 -0400251 }
Josef Bacik607d4322008-12-02 07:17:45 -0500252 if (result != (char *)&inline_result)
253 kfree(result);
Chris Mason19c00dd2007-10-15 16:19:22 -0400254 return 0;
255}
256
Chris Masond352ac62008-09-29 15:18:18 -0400257/*
258 * we can't consider a given block up to date unless the transid of the
259 * block matches the transid in the parent node's pointer. This is how we
260 * detect blocks that either didn't get written at all or got written
261 * in the wrong place.
262 */
Chris Mason1259ab72008-05-12 13:39:03 -0400263static int verify_parent_transid(struct extent_io_tree *io_tree,
264 struct extent_buffer *eb, u64 parent_transid)
265{
266 int ret;
267
268 if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
269 return 0;
270
271 lock_extent(io_tree, eb->start, eb->start + eb->len - 1, GFP_NOFS);
272 if (extent_buffer_uptodate(io_tree, eb) &&
273 btrfs_header_generation(eb) == parent_transid) {
274 ret = 0;
275 goto out;
276 }
Chris Mason193f2842009-04-27 07:29:05 -0400277 if (printk_ratelimit()) {
278 printk("parent transid verify failed on %llu wanted %llu "
279 "found %llu\n",
280 (unsigned long long)eb->start,
281 (unsigned long long)parent_transid,
282 (unsigned long long)btrfs_header_generation(eb));
283 }
Chris Mason1259ab72008-05-12 13:39:03 -0400284 ret = 1;
Chris Mason1259ab72008-05-12 13:39:03 -0400285 clear_extent_buffer_uptodate(io_tree, eb);
Chris Mason33958dc2008-07-30 10:29:12 -0400286out:
Chris Mason1259ab72008-05-12 13:39:03 -0400287 unlock_extent(io_tree, eb->start, eb->start + eb->len - 1,
288 GFP_NOFS);
289 return ret;
Chris Mason1259ab72008-05-12 13:39:03 -0400290}
291
Chris Masond352ac62008-09-29 15:18:18 -0400292/*
293 * helper to read a given tree block, doing retries as required when
294 * the checksums don't match and we have alternate mirrors to try.
295 */
Chris Masonf1885912008-04-09 16:28:12 -0400296static int btree_read_extent_buffer_pages(struct btrfs_root *root,
297 struct extent_buffer *eb,
Chris Masonca7a79a2008-05-12 12:59:19 -0400298 u64 start, u64 parent_transid)
Chris Masonf1885912008-04-09 16:28:12 -0400299{
300 struct extent_io_tree *io_tree;
301 int ret;
302 int num_copies = 0;
303 int mirror_num = 0;
304
305 io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
306 while (1) {
307 ret = read_extent_buffer_pages(io_tree, eb, start, 1,
308 btree_get_extent, mirror_num);
Chris Mason1259ab72008-05-12 13:39:03 -0400309 if (!ret &&
310 !verify_parent_transid(io_tree, eb, parent_transid))
Chris Masonf1885912008-04-09 16:28:12 -0400311 return ret;
Chris Masond3977122009-01-05 21:25:51 -0500312
Chris Masonf1885912008-04-09 16:28:12 -0400313 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
314 eb->start, eb->len);
Chris Mason42352982008-04-28 16:40:52 -0400315 if (num_copies == 1)
Chris Masonf1885912008-04-09 16:28:12 -0400316 return ret;
Chris Mason42352982008-04-28 16:40:52 -0400317
Chris Masonf1885912008-04-09 16:28:12 -0400318 mirror_num++;
Chris Mason42352982008-04-28 16:40:52 -0400319 if (mirror_num > num_copies)
Chris Masonf1885912008-04-09 16:28:12 -0400320 return ret;
Chris Masonf1885912008-04-09 16:28:12 -0400321 }
Chris Masonf1885912008-04-09 16:28:12 -0400322 return -EIO;
323}
Chris Mason19c00dd2007-10-15 16:19:22 -0400324
Chris Masond352ac62008-09-29 15:18:18 -0400325/*
Chris Masond3977122009-01-05 21:25:51 -0500326 * checksum a dirty tree block before IO. This has extra checks to make sure
327 * we only fill in the checksum field in the first page of a multi-page block
Chris Masond352ac62008-09-29 15:18:18 -0400328 */
Chris Masond3977122009-01-05 21:25:51 -0500329
Christoph Hellwigb2950862008-12-02 09:54:17 -0500330static int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
Chris Mason19c00dd2007-10-15 16:19:22 -0400331{
Chris Masond1310b22008-01-24 16:13:08 -0500332 struct extent_io_tree *tree;
Chris Mason35ebb932007-10-30 16:56:53 -0400333 u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
Chris Mason19c00dd2007-10-15 16:19:22 -0400334 u64 found_start;
335 int found_level;
336 unsigned long len;
337 struct extent_buffer *eb;
Chris Masonf1885912008-04-09 16:28:12 -0400338 int ret;
339
Chris Masond1310b22008-01-24 16:13:08 -0500340 tree = &BTRFS_I(page->mapping->host)->io_tree;
Chris Mason19c00dd2007-10-15 16:19:22 -0400341
342 if (page->private == EXTENT_PAGE_PRIVATE)
343 goto out;
344 if (!page->private)
345 goto out;
346 len = page->private >> 2;
Chris Masond3977122009-01-05 21:25:51 -0500347 WARN_ON(len == 0);
348
Chris Mason19c00dd2007-10-15 16:19:22 -0400349 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
Chris Masonca7a79a2008-05-12 12:59:19 -0400350 ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE,
351 btrfs_header_generation(eb));
Chris Masonf1885912008-04-09 16:28:12 -0400352 BUG_ON(ret);
Chris Mason19c00dd2007-10-15 16:19:22 -0400353 found_start = btrfs_header_bytenr(eb);
354 if (found_start != start) {
Chris Mason55c69072008-01-09 15:55:33 -0500355 WARN_ON(1);
356 goto err;
357 }
358 if (eb->first_page != page) {
Chris Mason55c69072008-01-09 15:55:33 -0500359 WARN_ON(1);
360 goto err;
361 }
362 if (!PageUptodate(page)) {
Chris Mason55c69072008-01-09 15:55:33 -0500363 WARN_ON(1);
364 goto err;
Chris Mason19c00dd2007-10-15 16:19:22 -0400365 }
366 found_level = btrfs_header_level(eb);
Chris Mason4bef0842008-09-08 11:18:08 -0400367
Chris Mason19c00dd2007-10-15 16:19:22 -0400368 csum_tree_block(root, eb, 0);
Chris Mason55c69072008-01-09 15:55:33 -0500369err:
Chris Mason19c00dd2007-10-15 16:19:22 -0400370 free_extent_buffer(eb);
371out:
372 return 0;
373}
374
Yan Zheng2b820322008-11-17 21:11:30 -0500375static int check_tree_block_fsid(struct btrfs_root *root,
376 struct extent_buffer *eb)
377{
378 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
379 u8 fsid[BTRFS_UUID_SIZE];
380 int ret = 1;
381
382 read_extent_buffer(eb, fsid, (unsigned long)btrfs_header_fsid(eb),
383 BTRFS_FSID_SIZE);
384 while (fs_devices) {
385 if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) {
386 ret = 0;
387 break;
388 }
389 fs_devices = fs_devices->seed;
390 }
391 return ret;
392}
393
Chris Mason4008c042009-02-12 14:09:45 -0500394#ifdef CONFIG_DEBUG_LOCK_ALLOC
395void btrfs_set_buffer_lockdep_class(struct extent_buffer *eb, int level)
396{
397 lockdep_set_class_and_name(&eb->lock,
398 &btrfs_eb_class[level],
399 btrfs_eb_name[level]);
400}
401#endif
402
Christoph Hellwigb2950862008-12-02 09:54:17 -0500403static int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
Chris Masonce9adaa2008-04-09 16:28:12 -0400404 struct extent_state *state)
405{
406 struct extent_io_tree *tree;
407 u64 found_start;
408 int found_level;
409 unsigned long len;
410 struct extent_buffer *eb;
411 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
Chris Masonf1885912008-04-09 16:28:12 -0400412 int ret = 0;
Chris Masonce9adaa2008-04-09 16:28:12 -0400413
414 tree = &BTRFS_I(page->mapping->host)->io_tree;
415 if (page->private == EXTENT_PAGE_PRIVATE)
416 goto out;
417 if (!page->private)
418 goto out;
Chris Masond3977122009-01-05 21:25:51 -0500419
Chris Masonce9adaa2008-04-09 16:28:12 -0400420 len = page->private >> 2;
Chris Masond3977122009-01-05 21:25:51 -0500421 WARN_ON(len == 0);
422
Chris Masonce9adaa2008-04-09 16:28:12 -0400423 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
Chris Masonf1885912008-04-09 16:28:12 -0400424
Chris Masonce9adaa2008-04-09 16:28:12 -0400425 found_start = btrfs_header_bytenr(eb);
Chris Mason23a07862008-09-12 08:57:47 -0400426 if (found_start != start) {
Chris Mason193f2842009-04-27 07:29:05 -0400427 if (printk_ratelimit()) {
428 printk(KERN_INFO "btrfs bad tree block start "
429 "%llu %llu\n",
430 (unsigned long long)found_start,
431 (unsigned long long)eb->start);
432 }
Chris Masonf1885912008-04-09 16:28:12 -0400433 ret = -EIO;
Chris Masonce9adaa2008-04-09 16:28:12 -0400434 goto err;
435 }
436 if (eb->first_page != page) {
Chris Masond3977122009-01-05 21:25:51 -0500437 printk(KERN_INFO "btrfs bad first page %lu %lu\n",
438 eb->first_page->index, page->index);
Chris Masonce9adaa2008-04-09 16:28:12 -0400439 WARN_ON(1);
Chris Masonf1885912008-04-09 16:28:12 -0400440 ret = -EIO;
Chris Masonce9adaa2008-04-09 16:28:12 -0400441 goto err;
442 }
Yan Zheng2b820322008-11-17 21:11:30 -0500443 if (check_tree_block_fsid(root, eb)) {
Chris Mason193f2842009-04-27 07:29:05 -0400444 if (printk_ratelimit()) {
445 printk(KERN_INFO "btrfs bad fsid on block %llu\n",
446 (unsigned long long)eb->start);
447 }
Chris Mason1259ab72008-05-12 13:39:03 -0400448 ret = -EIO;
449 goto err;
450 }
Chris Masonce9adaa2008-04-09 16:28:12 -0400451 found_level = btrfs_header_level(eb);
452
Chris Mason4008c042009-02-12 14:09:45 -0500453 btrfs_set_buffer_lockdep_class(eb, found_level);
454
Chris Masonce9adaa2008-04-09 16:28:12 -0400455 ret = csum_tree_block(root, eb, 1);
Chris Masonf1885912008-04-09 16:28:12 -0400456 if (ret)
457 ret = -EIO;
Chris Masonce9adaa2008-04-09 16:28:12 -0400458
459 end = min_t(u64, eb->len, PAGE_CACHE_SIZE);
460 end = eb->start + end - 1;
Chris Masonce9adaa2008-04-09 16:28:12 -0400461err:
462 free_extent_buffer(eb);
463out:
Chris Masonf1885912008-04-09 16:28:12 -0400464 return ret;
Chris Masonce9adaa2008-04-09 16:28:12 -0400465}
466
Chris Masonce9adaa2008-04-09 16:28:12 -0400467static void end_workqueue_bio(struct bio *bio, int err)
Chris Masonce9adaa2008-04-09 16:28:12 -0400468{
469 struct end_io_wq *end_io_wq = bio->bi_private;
470 struct btrfs_fs_info *fs_info;
Chris Masonce9adaa2008-04-09 16:28:12 -0400471
Chris Masonce9adaa2008-04-09 16:28:12 -0400472 fs_info = end_io_wq->info;
Chris Masonce9adaa2008-04-09 16:28:12 -0400473 end_io_wq->error = err;
Chris Mason8b712842008-06-11 16:50:36 -0400474 end_io_wq->work.func = end_workqueue_fn;
475 end_io_wq->work.flags = 0;
Chris Masond20f7042008-12-08 16:58:54 -0500476
477 if (bio->bi_rw & (1 << BIO_RW)) {
Chris Masoncad321a2008-12-17 14:51:42 -0500478 if (end_io_wq->metadata)
479 btrfs_queue_worker(&fs_info->endio_meta_write_workers,
480 &end_io_wq->work);
481 else
482 btrfs_queue_worker(&fs_info->endio_write_workers,
483 &end_io_wq->work);
Chris Masond20f7042008-12-08 16:58:54 -0500484 } else {
485 if (end_io_wq->metadata)
486 btrfs_queue_worker(&fs_info->endio_meta_workers,
487 &end_io_wq->work);
488 else
489 btrfs_queue_worker(&fs_info->endio_workers,
490 &end_io_wq->work);
491 }
Chris Masonce9adaa2008-04-09 16:28:12 -0400492}
493
Chris Mason22c59942008-04-09 16:28:12 -0400494int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
495 int metadata)
Chris Mason0b86a832008-03-24 15:01:56 -0400496{
Chris Masonce9adaa2008-04-09 16:28:12 -0400497 struct end_io_wq *end_io_wq;
Chris Masonce9adaa2008-04-09 16:28:12 -0400498 end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS);
499 if (!end_io_wq)
500 return -ENOMEM;
501
502 end_io_wq->private = bio->bi_private;
503 end_io_wq->end_io = bio->bi_end_io;
Chris Mason22c59942008-04-09 16:28:12 -0400504 end_io_wq->info = info;
Chris Masonce9adaa2008-04-09 16:28:12 -0400505 end_io_wq->error = 0;
506 end_io_wq->bio = bio;
Chris Mason22c59942008-04-09 16:28:12 -0400507 end_io_wq->metadata = metadata;
Chris Masonce9adaa2008-04-09 16:28:12 -0400508
509 bio->bi_private = end_io_wq;
510 bio->bi_end_io = end_workqueue_bio;
Chris Mason22c59942008-04-09 16:28:12 -0400511 return 0;
512}
513
Chris Masonb64a2852008-08-20 13:39:41 -0400514unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info)
Chris Mason4854ddd2008-08-15 15:34:17 -0400515{
516 unsigned long limit = min_t(unsigned long,
517 info->workers.max_workers,
518 info->fs_devices->open_devices);
519 return 256 * limit;
520}
521
Chris Mason777e6bd2008-08-15 15:34:15 -0400522int btrfs_congested_async(struct btrfs_fs_info *info, int iodone)
Chris Mason0986fe92008-08-15 15:34:15 -0400523{
Chris Masonb64a2852008-08-20 13:39:41 -0400524 return atomic_read(&info->nr_async_bios) >
525 btrfs_async_submit_limit(info);
Chris Mason0986fe92008-08-15 15:34:15 -0400526}
527
Chris Mason4a69a412008-11-06 22:03:00 -0500528static void run_one_async_start(struct btrfs_work *work)
529{
530 struct btrfs_fs_info *fs_info;
531 struct async_submit_bio *async;
532
533 async = container_of(work, struct async_submit_bio, work);
534 fs_info = BTRFS_I(async->inode)->root->fs_info;
535 async->submit_bio_start(async->inode, async->rw, async->bio,
536 async->mirror_num, async->bio_flags);
537}
538
539static void run_one_async_done(struct btrfs_work *work)
Chris Mason8b712842008-06-11 16:50:36 -0400540{
541 struct btrfs_fs_info *fs_info;
542 struct async_submit_bio *async;
Chris Mason4854ddd2008-08-15 15:34:17 -0400543 int limit;
Chris Mason8b712842008-06-11 16:50:36 -0400544
545 async = container_of(work, struct async_submit_bio, work);
546 fs_info = BTRFS_I(async->inode)->root->fs_info;
Chris Mason4854ddd2008-08-15 15:34:17 -0400547
Chris Masonb64a2852008-08-20 13:39:41 -0400548 limit = btrfs_async_submit_limit(fs_info);
Chris Mason4854ddd2008-08-15 15:34:17 -0400549 limit = limit * 2 / 3;
550
Chris Mason8b712842008-06-11 16:50:36 -0400551 atomic_dec(&fs_info->nr_async_submits);
Chris Mason0986fe92008-08-15 15:34:15 -0400552
Chris Masonb64a2852008-08-20 13:39:41 -0400553 if (atomic_read(&fs_info->nr_async_submits) < limit &&
554 waitqueue_active(&fs_info->async_submit_wait))
Chris Mason4854ddd2008-08-15 15:34:17 -0400555 wake_up(&fs_info->async_submit_wait);
556
Chris Mason4a69a412008-11-06 22:03:00 -0500557 async->submit_bio_done(async->inode, async->rw, async->bio,
Chris Masonc8b97812008-10-29 14:49:59 -0400558 async->mirror_num, async->bio_flags);
Chris Mason4a69a412008-11-06 22:03:00 -0500559}
560
561static void run_one_async_free(struct btrfs_work *work)
562{
563 struct async_submit_bio *async;
564
565 async = container_of(work, struct async_submit_bio, work);
Chris Mason8b712842008-06-11 16:50:36 -0400566 kfree(async);
567}
568
Chris Mason44b8bd72008-04-16 11:14:51 -0400569int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
570 int rw, struct bio *bio, int mirror_num,
Chris Masonc8b97812008-10-29 14:49:59 -0400571 unsigned long bio_flags,
Chris Mason4a69a412008-11-06 22:03:00 -0500572 extent_submit_bio_hook_t *submit_bio_start,
573 extent_submit_bio_hook_t *submit_bio_done)
Chris Mason44b8bd72008-04-16 11:14:51 -0400574{
575 struct async_submit_bio *async;
576
577 async = kmalloc(sizeof(*async), GFP_NOFS);
578 if (!async)
579 return -ENOMEM;
580
581 async->inode = inode;
582 async->rw = rw;
583 async->bio = bio;
584 async->mirror_num = mirror_num;
Chris Mason4a69a412008-11-06 22:03:00 -0500585 async->submit_bio_start = submit_bio_start;
586 async->submit_bio_done = submit_bio_done;
587
588 async->work.func = run_one_async_start;
589 async->work.ordered_func = run_one_async_done;
590 async->work.ordered_free = run_one_async_free;
591
Chris Mason8b712842008-06-11 16:50:36 -0400592 async->work.flags = 0;
Chris Masonc8b97812008-10-29 14:49:59 -0400593 async->bio_flags = bio_flags;
Chris Mason8c8bee12008-09-29 11:19:10 -0400594
Chris Masoncb03c742008-05-15 16:15:45 -0400595 atomic_inc(&fs_info->nr_async_submits);
Chris Masond313d7a2009-04-20 15:50:09 -0400596
597 if (rw & (1 << BIO_RW_SYNCIO))
598 btrfs_set_work_high_prio(&async->work);
599
Chris Mason8b712842008-06-11 16:50:36 -0400600 btrfs_queue_worker(&fs_info->workers, &async->work);
Chris Mason9473f162008-08-28 06:15:24 -0400601
Chris Masond3977122009-01-05 21:25:51 -0500602 while (atomic_read(&fs_info->async_submit_draining) &&
Chris Mason771ed682008-11-06 22:02:51 -0500603 atomic_read(&fs_info->nr_async_submits)) {
604 wait_event(fs_info->async_submit_wait,
605 (atomic_read(&fs_info->nr_async_submits) == 0));
606 }
607
Chris Mason44b8bd72008-04-16 11:14:51 -0400608 return 0;
609}
610
Chris Masonce3ed712008-09-23 13:14:12 -0400611static int btree_csum_one_bio(struct bio *bio)
612{
613 struct bio_vec *bvec = bio->bi_io_vec;
614 int bio_index = 0;
615 struct btrfs_root *root;
616
617 WARN_ON(bio->bi_vcnt <= 0);
Chris Masond3977122009-01-05 21:25:51 -0500618 while (bio_index < bio->bi_vcnt) {
Chris Masonce3ed712008-09-23 13:14:12 -0400619 root = BTRFS_I(bvec->bv_page->mapping->host)->root;
620 csum_dirty_buffer(root, bvec->bv_page);
621 bio_index++;
622 bvec++;
623 }
624 return 0;
625}
626
Chris Mason4a69a412008-11-06 22:03:00 -0500627static int __btree_submit_bio_start(struct inode *inode, int rw,
628 struct bio *bio, int mirror_num,
629 unsigned long bio_flags)
Chris Mason22c59942008-04-09 16:28:12 -0400630{
Chris Mason8b712842008-06-11 16:50:36 -0400631 /*
632 * when we're called for a write, we're already in the async
Chris Mason5443be42008-08-15 15:34:16 -0400633 * submission context. Just jump into btrfs_map_bio
Chris Mason8b712842008-06-11 16:50:36 -0400634 */
Chris Mason4a69a412008-11-06 22:03:00 -0500635 btree_csum_one_bio(bio);
636 return 0;
637}
Chris Mason22c59942008-04-09 16:28:12 -0400638
Chris Mason4a69a412008-11-06 22:03:00 -0500639static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio,
640 int mirror_num, unsigned long bio_flags)
641{
Chris Mason8b712842008-06-11 16:50:36 -0400642 /*
Chris Mason4a69a412008-11-06 22:03:00 -0500643 * when we're called for a write, we're already in the async
644 * submission context. Just jump into btrfs_map_bio
Chris Mason8b712842008-06-11 16:50:36 -0400645 */
Chris Mason8b712842008-06-11 16:50:36 -0400646 return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1);
Chris Mason0b86a832008-03-24 15:01:56 -0400647}
648
Chris Mason44b8bd72008-04-16 11:14:51 -0400649static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
Chris Masonc8b97812008-10-29 14:49:59 -0400650 int mirror_num, unsigned long bio_flags)
Chris Mason44b8bd72008-04-16 11:14:51 -0400651{
Chris Masoncad321a2008-12-17 14:51:42 -0500652 int ret;
653
654 ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info,
655 bio, 1);
656 BUG_ON(ret);
657
Chris Mason44b8bd72008-04-16 11:14:51 -0400658 if (!(rw & (1 << BIO_RW))) {
Chris Mason4a69a412008-11-06 22:03:00 -0500659 /*
660 * called for a read, do the setup so that checksum validation
661 * can happen in the async kernel threads
662 */
Chris Mason4a69a412008-11-06 22:03:00 -0500663 return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio,
Chris Mason6f3577b2008-11-13 09:59:36 -0500664 mirror_num, 0);
Chris Mason44b8bd72008-04-16 11:14:51 -0400665 }
Chris Masond313d7a2009-04-20 15:50:09 -0400666
Chris Masoncad321a2008-12-17 14:51:42 -0500667 /*
668 * kthread helpers are used to submit writes so that checksumming
669 * can happen in parallel across all CPUs
670 */
Chris Mason44b8bd72008-04-16 11:14:51 -0400671 return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
Chris Masonc8b97812008-10-29 14:49:59 -0400672 inode, rw, bio, mirror_num, 0,
Chris Mason4a69a412008-11-06 22:03:00 -0500673 __btree_submit_bio_start,
674 __btree_submit_bio_done);
Chris Mason44b8bd72008-04-16 11:14:51 -0400675}
676
Chris Mason5f39d392007-10-15 16:14:19 -0400677static int btree_writepage(struct page *page, struct writeback_control *wbc)
678{
Chris Masond1310b22008-01-24 16:13:08 -0500679 struct extent_io_tree *tree;
Chris Masonb9473432009-03-13 11:00:37 -0400680 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
681 struct extent_buffer *eb;
682 int was_dirty;
Chris Mason5443be42008-08-15 15:34:16 -0400683
Chris Masonb9473432009-03-13 11:00:37 -0400684 tree = &BTRFS_I(page->mapping->host)->io_tree;
685 if (!(current->flags & PF_MEMALLOC)) {
686 return extent_write_full_page(tree, page,
687 btree_get_extent, wbc);
Chris Mason5443be42008-08-15 15:34:16 -0400688 }
Chris Masonb9473432009-03-13 11:00:37 -0400689
690 redirty_page_for_writepage(wbc, page);
691 eb = btrfs_find_tree_block(root, page_offset(page),
692 PAGE_CACHE_SIZE);
693 WARN_ON(!eb);
694
695 was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags);
696 if (!was_dirty) {
697 spin_lock(&root->fs_info->delalloc_lock);
698 root->fs_info->dirty_metadata_bytes += PAGE_CACHE_SIZE;
699 spin_unlock(&root->fs_info->delalloc_lock);
700 }
701 free_extent_buffer(eb);
702
703 unlock_page(page);
704 return 0;
Chris Mason5f39d392007-10-15 16:14:19 -0400705}
Chris Mason0da54682007-11-07 21:08:01 -0500706
707static int btree_writepages(struct address_space *mapping,
708 struct writeback_control *wbc)
709{
Chris Masond1310b22008-01-24 16:13:08 -0500710 struct extent_io_tree *tree;
711 tree = &BTRFS_I(mapping->host)->io_tree;
Chris Masond8d5f3e2007-12-11 12:42:00 -0500712 if (wbc->sync_mode == WB_SYNC_NONE) {
Chris Masonb9473432009-03-13 11:00:37 -0400713 struct btrfs_root *root = BTRFS_I(mapping->host)->root;
Chris Mason793955b2007-11-26 16:34:41 -0800714 u64 num_dirty;
Chris Mason24ab9cd2008-09-24 14:51:30 -0400715 unsigned long thresh = 32 * 1024 * 1024;
Chris Mason448d6402007-11-27 07:52:01 -0800716
717 if (wbc->for_kupdate)
718 return 0;
719
Chris Masonb9473432009-03-13 11:00:37 -0400720 /* this is a bit racy, but that's ok */
721 num_dirty = root->fs_info->dirty_metadata_bytes;
Chris Masond3977122009-01-05 21:25:51 -0500722 if (num_dirty < thresh)
Chris Mason793955b2007-11-26 16:34:41 -0800723 return 0;
Chris Mason793955b2007-11-26 16:34:41 -0800724 }
Chris Mason0da54682007-11-07 21:08:01 -0500725 return extent_writepages(tree, mapping, btree_get_extent, wbc);
726}
727
Christoph Hellwigb2950862008-12-02 09:54:17 -0500728static int btree_readpage(struct file *file, struct page *page)
Chris Mason5f39d392007-10-15 16:14:19 -0400729{
Chris Masond1310b22008-01-24 16:13:08 -0500730 struct extent_io_tree *tree;
731 tree = &BTRFS_I(page->mapping->host)->io_tree;
Chris Mason5f39d392007-10-15 16:14:19 -0400732 return extent_read_full_page(tree, page, btree_get_extent);
733}
734
Chris Mason70dec802008-01-29 09:59:12 -0500735static int btree_releasepage(struct page *page, gfp_t gfp_flags)
Chris Mason5f39d392007-10-15 16:14:19 -0400736{
Chris Masond1310b22008-01-24 16:13:08 -0500737 struct extent_io_tree *tree;
738 struct extent_map_tree *map;
Chris Mason5f39d392007-10-15 16:14:19 -0400739 int ret;
740
Chris Mason98509cf2008-09-11 15:51:43 -0400741 if (PageWriteback(page) || PageDirty(page))
Chris Masond3977122009-01-05 21:25:51 -0500742 return 0;
Chris Mason98509cf2008-09-11 15:51:43 -0400743
Chris Masond1310b22008-01-24 16:13:08 -0500744 tree = &BTRFS_I(page->mapping->host)->io_tree;
745 map = &BTRFS_I(page->mapping->host)->extent_tree;
Chris Mason6af118c2008-07-22 11:18:07 -0400746
Chris Mason7b13b7b2008-04-18 10:29:50 -0400747 ret = try_release_extent_state(map, tree, page, gfp_flags);
Chris Masond3977122009-01-05 21:25:51 -0500748 if (!ret)
Chris Mason6af118c2008-07-22 11:18:07 -0400749 return 0;
Chris Mason6af118c2008-07-22 11:18:07 -0400750
751 ret = try_release_extent_buffer(tree, page);
Chris Mason5f39d392007-10-15 16:14:19 -0400752 if (ret == 1) {
753 ClearPagePrivate(page);
754 set_page_private(page, 0);
755 page_cache_release(page);
756 }
Chris Mason6af118c2008-07-22 11:18:07 -0400757
Chris Masond98237b2007-03-28 13:57:48 -0400758 return ret;
Chris Masone20d96d2007-03-22 12:13:20 -0400759}
Chris Mason123abc82007-03-14 14:14:43 -0400760
Chris Mason5f39d392007-10-15 16:14:19 -0400761static void btree_invalidatepage(struct page *page, unsigned long offset)
Chris Masond98237b2007-03-28 13:57:48 -0400762{
Chris Masond1310b22008-01-24 16:13:08 -0500763 struct extent_io_tree *tree;
764 tree = &BTRFS_I(page->mapping->host)->io_tree;
Chris Mason5f39d392007-10-15 16:14:19 -0400765 extent_invalidatepage(tree, page, offset);
766 btree_releasepage(page, GFP_NOFS);
Chris Mason9ad6b7b2008-04-18 16:11:30 -0400767 if (PagePrivate(page)) {
Chris Masond3977122009-01-05 21:25:51 -0500768 printk(KERN_WARNING "btrfs warning page private not zero "
769 "on page %llu\n", (unsigned long long)page_offset(page));
Chris Mason9ad6b7b2008-04-18 16:11:30 -0400770 ClearPagePrivate(page);
771 set_page_private(page, 0);
772 page_cache_release(page);
773 }
Chris Masond98237b2007-03-28 13:57:48 -0400774}
775
Alexey Dobriyan7f094102009-09-21 17:01:10 -0700776static const struct address_space_operations btree_aops = {
Chris Masond98237b2007-03-28 13:57:48 -0400777 .readpage = btree_readpage,
778 .writepage = btree_writepage,
Chris Mason0da54682007-11-07 21:08:01 -0500779 .writepages = btree_writepages,
Chris Mason5f39d392007-10-15 16:14:19 -0400780 .releasepage = btree_releasepage,
781 .invalidatepage = btree_invalidatepage,
Chris Masond98237b2007-03-28 13:57:48 -0400782 .sync_page = block_sync_page,
783};
784
Chris Masonca7a79a2008-05-12 12:59:19 -0400785int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
786 u64 parent_transid)
Chris Mason090d1872007-05-01 08:53:32 -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 Masonde428b62007-05-18 13:28:27 -0400790 int ret = 0;
Chris Mason090d1872007-05-01 08:53:32 -0400791
Chris Masondb945352007-10-15 16:15:53 -0400792 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
Chris Mason5f39d392007-10-15 16:14:19 -0400793 if (!buf)
Chris Mason090d1872007-05-01 08:53:32 -0400794 return 0;
Chris Masond1310b22008-01-24 16:13:08 -0500795 read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
Chris Masonf1885912008-04-09 16:28:12 -0400796 buf, 0, 0, btree_get_extent, 0);
Chris Mason5f39d392007-10-15 16:14:19 -0400797 free_extent_buffer(buf);
Chris Masonde428b62007-05-18 13:28:27 -0400798 return ret;
Chris Mason090d1872007-05-01 08:53:32 -0400799}
800
Chris Mason0999df52008-04-01 13:48:14 -0400801struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
802 u64 bytenr, u32 blocksize)
803{
804 struct inode *btree_inode = root->fs_info->btree_inode;
805 struct extent_buffer *eb;
806 eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
807 bytenr, blocksize, GFP_NOFS);
808 return eb;
809}
810
811struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
812 u64 bytenr, u32 blocksize)
813{
814 struct inode *btree_inode = root->fs_info->btree_inode;
815 struct extent_buffer *eb;
816
817 eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
818 bytenr, blocksize, NULL, GFP_NOFS);
819 return eb;
820}
821
822
Chris Masone02119d2008-09-05 16:13:11 -0400823int btrfs_write_tree_block(struct extent_buffer *buf)
824{
Christoph Hellwig8aa38c32009-10-01 12:58:30 -0400825 return filemap_fdatawrite_range(buf->first_page->mapping, buf->start,
826 buf->start + buf->len - 1);
Chris Masone02119d2008-09-05 16:13:11 -0400827}
828
829int btrfs_wait_tree_block_writeback(struct extent_buffer *buf)
830{
Christoph Hellwig8aa38c32009-10-01 12:58:30 -0400831 return filemap_fdatawait_range(buf->first_page->mapping,
832 buf->start, buf->start + buf->len - 1);
Chris Masone02119d2008-09-05 16:13:11 -0400833}
834
Chris Masondb945352007-10-15 16:15:53 -0400835struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
Chris Masonca7a79a2008-05-12 12:59:19 -0400836 u32 blocksize, u64 parent_transid)
Chris Masone20d96d2007-03-22 12:13:20 -0400837{
Chris Mason5f39d392007-10-15 16:14:19 -0400838 struct extent_buffer *buf = NULL;
839 struct inode *btree_inode = root->fs_info->btree_inode;
Chris Masond1310b22008-01-24 16:13:08 -0500840 struct extent_io_tree *io_tree;
Chris Mason19c00dd2007-10-15 16:19:22 -0400841 int ret;
842
Chris Masond1310b22008-01-24 16:13:08 -0500843 io_tree = &BTRFS_I(btree_inode)->io_tree;
Chris Masone20d96d2007-03-22 12:13:20 -0400844
Chris Masondb945352007-10-15 16:15:53 -0400845 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
Chris Mason5f39d392007-10-15 16:14:19 -0400846 if (!buf)
847 return NULL;
Chris Masone4204de2008-01-08 15:46:27 -0500848
Chris Masonca7a79a2008-05-12 12:59:19 -0400849 ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
Chris Masonce9adaa2008-04-09 16:28:12 -0400850
Chris Masond3977122009-01-05 21:25:51 -0500851 if (ret == 0)
Chris Masonb4ce94d2009-02-04 09:25:08 -0500852 set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags);
Chris Mason5f39d392007-10-15 16:14:19 -0400853 return buf;
Chris Masonce9adaa2008-04-09 16:28:12 -0400854
Chris Masoneb60cea2007-02-02 09:18:22 -0500855}
856
Chris Masone089f052007-03-16 16:20:31 -0400857int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
Chris Mason5f39d392007-10-15 16:14:19 -0400858 struct extent_buffer *buf)
Chris Masoned2ff2c2007-03-01 18:59:40 -0500859{
Chris Mason5f39d392007-10-15 16:14:19 -0400860 struct inode *btree_inode = root->fs_info->btree_inode;
Chris Mason55c69072008-01-09 15:55:33 -0500861 if (btrfs_header_generation(buf) ==
Chris Mason925baed2008-06-25 16:01:30 -0400862 root->fs_info->running_transaction->transid) {
Chris Masonb9447ef2009-03-09 11:45:38 -0400863 btrfs_assert_tree_locked(buf);
Chris Masonb4ce94d2009-02-04 09:25:08 -0500864
Chris Masonb9473432009-03-13 11:00:37 -0400865 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) {
866 spin_lock(&root->fs_info->delalloc_lock);
867 if (root->fs_info->dirty_metadata_bytes >= buf->len)
868 root->fs_info->dirty_metadata_bytes -= buf->len;
869 else
870 WARN_ON(1);
871 spin_unlock(&root->fs_info->delalloc_lock);
872 }
Chris Masonb4ce94d2009-02-04 09:25:08 -0500873
Chris Masonb9473432009-03-13 11:00:37 -0400874 /* ugh, clear_extent_buffer_dirty needs to lock the page */
875 btrfs_set_lock_blocking(buf);
Chris Masond1310b22008-01-24 16:13:08 -0500876 clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
Chris Mason55c69072008-01-09 15:55:33 -0500877 buf);
Chris Mason925baed2008-06-25 16:01:30 -0400878 }
Chris Mason5f39d392007-10-15 16:14:19 -0400879 return 0;
880}
881
Chris Masondb945352007-10-15 16:15:53 -0400882static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
Chris Mason87ee04e2007-11-30 11:30:34 -0500883 u32 stripesize, struct btrfs_root *root,
Chris Mason9f5fae22007-03-20 14:38:32 -0400884 struct btrfs_fs_info *fs_info,
Chris Masone20d96d2007-03-22 12:13:20 -0400885 u64 objectid)
Chris Masond97e63b2007-02-20 16:40:44 -0500886{
Chris Masoncfaa7292007-02-21 17:04:57 -0500887 root->node = NULL;
Chris Masona28ec192007-03-06 20:08:01 -0500888 root->commit_root = NULL;
Chris Masondb945352007-10-15 16:15:53 -0400889 root->sectorsize = sectorsize;
890 root->nodesize = nodesize;
891 root->leafsize = leafsize;
Chris Mason87ee04e2007-11-30 11:30:34 -0500892 root->stripesize = stripesize;
Chris Mason123abc82007-03-14 14:14:43 -0400893 root->ref_cows = 0;
Chris Mason0b86a832008-03-24 15:01:56 -0400894 root->track_dirty = 0;
895
Chris Mason9f5fae22007-03-20 14:38:32 -0400896 root->fs_info = fs_info;
Chris Mason0f7d52f2007-04-09 10:42:37 -0400897 root->objectid = objectid;
898 root->last_trans = 0;
Yan, Zheng13a8a7c2009-09-21 15:56:00 -0400899 root->highest_objectid = 0;
Josef Bacik58176a92007-08-29 15:47:34 -0400900 root->name = NULL;
Chris Mason4313b392008-01-03 09:08:48 -0500901 root->in_sysfs = 0;
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400902 root->inode_tree.rb_node = NULL;
Chris Mason0b86a832008-03-24 15:01:56 -0400903
904 INIT_LIST_HEAD(&root->dirty_list);
Josef Bacik7b128762008-07-24 12:17:14 -0400905 INIT_LIST_HEAD(&root->orphan_list);
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400906 INIT_LIST_HEAD(&root->root_list);
Chris Mason925baed2008-06-25 16:01:30 -0400907 spin_lock_init(&root->node_lock);
Yanbcc63ab2008-07-30 16:29:20 -0400908 spin_lock_init(&root->list_lock);
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400909 spin_lock_init(&root->inode_lock);
Chris Masona2135012008-06-25 16:01:30 -0400910 mutex_init(&root->objectid_mutex);
Chris Masone02119d2008-09-05 16:13:11 -0400911 mutex_init(&root->log_mutex);
Yan Zheng7237f182009-01-21 12:54:03 -0500912 init_waitqueue_head(&root->log_writer_wait);
913 init_waitqueue_head(&root->log_commit_wait[0]);
914 init_waitqueue_head(&root->log_commit_wait[1]);
915 atomic_set(&root->log_commit[0], 0);
916 atomic_set(&root->log_commit[1], 0);
917 atomic_set(&root->log_writers, 0);
918 root->log_batch = 0;
919 root->log_transid = 0;
Chris Masond0c803c2008-09-11 16:17:57 -0400920 extent_io_tree_init(&root->dirty_log_pages,
921 fs_info->btree_inode->i_mapping, GFP_NOFS);
Chris Mason017e5362008-07-28 15:32:51 -0400922
Chris Mason3768f362007-03-13 16:47:54 -0400923 memset(&root->root_key, 0, sizeof(root->root_key));
924 memset(&root->root_item, 0, sizeof(root->root_item));
Chris Mason6702ed42007-08-07 16:15:09 -0400925 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
Josef Bacik58176a92007-08-29 15:47:34 -0400926 memset(&root->root_kobj, 0, sizeof(root->root_kobj));
Chris Mason3f157a22008-06-25 16:01:31 -0400927 root->defrag_trans_start = fs_info->generation;
Josef Bacik58176a92007-08-29 15:47:34 -0400928 init_completion(&root->kobj_unregister);
Chris Mason6702ed42007-08-07 16:15:09 -0400929 root->defrag_running = 0;
930 root->defrag_level = 0;
Chris Mason4d775672007-04-20 20:23:12 -0400931 root->root_key.objectid = objectid;
Chris Mason3394e162008-11-17 20:42:26 -0500932 root->anon_super.s_root = NULL;
933 root->anon_super.s_dev = 0;
934 INIT_LIST_HEAD(&root->anon_super.s_list);
935 INIT_LIST_HEAD(&root->anon_super.s_instances);
936 init_rwsem(&root->anon_super.s_umount);
937
Chris Mason3768f362007-03-13 16:47:54 -0400938 return 0;
939}
940
Chris Masondb945352007-10-15 16:15:53 -0400941static int find_and_setup_root(struct btrfs_root *tree_root,
Chris Mason9f5fae22007-03-20 14:38:32 -0400942 struct btrfs_fs_info *fs_info,
943 u64 objectid,
Chris Masone20d96d2007-03-22 12:13:20 -0400944 struct btrfs_root *root)
Chris Mason3768f362007-03-13 16:47:54 -0400945{
946 int ret;
Chris Masondb945352007-10-15 16:15:53 -0400947 u32 blocksize;
Yan Zheng84234f32008-10-29 14:49:05 -0400948 u64 generation;
Chris Mason3768f362007-03-13 16:47:54 -0400949
Chris Masondb945352007-10-15 16:15:53 -0400950 __setup_root(tree_root->nodesize, tree_root->leafsize,
Chris Mason87ee04e2007-11-30 11:30:34 -0500951 tree_root->sectorsize, tree_root->stripesize,
952 root, fs_info, objectid);
Chris Mason3768f362007-03-13 16:47:54 -0400953 ret = btrfs_find_last_root(tree_root, objectid,
954 &root->root_item, &root->root_key);
Yan, Zheng4df27c4d2009-09-21 15:56:00 -0400955 if (ret > 0)
956 return -ENOENT;
Chris Mason3768f362007-03-13 16:47:54 -0400957 BUG_ON(ret);
958
Yan Zheng84234f32008-10-29 14:49:05 -0400959 generation = btrfs_root_generation(&root->root_item);
Chris Masondb945352007-10-15 16:15:53 -0400960 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
961 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
Yan Zheng84234f32008-10-29 14:49:05 -0400962 blocksize, generation);
Chris Mason3768f362007-03-13 16:47:54 -0400963 BUG_ON(!root->node);
Yan, Zheng4df27c4d2009-09-21 15:56:00 -0400964 root->commit_root = btrfs_root_node(root);
Chris Masond97e63b2007-02-20 16:40:44 -0500965 return 0;
966}
967
Chris Masone02119d2008-09-05 16:13:11 -0400968int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans,
969 struct btrfs_fs_info *fs_info)
970{
971 struct extent_buffer *eb;
Chris Masond0c803c2008-09-11 16:17:57 -0400972 struct btrfs_root *log_root_tree = fs_info->log_root_tree;
973 u64 start = 0;
974 u64 end = 0;
Chris Masone02119d2008-09-05 16:13:11 -0400975 int ret;
976
Chris Masond0c803c2008-09-11 16:17:57 -0400977 if (!log_root_tree)
Chris Masone02119d2008-09-05 16:13:11 -0400978 return 0;
979
Chris Masond3977122009-01-05 21:25:51 -0500980 while (1) {
Chris Masond0c803c2008-09-11 16:17:57 -0400981 ret = find_first_extent_bit(&log_root_tree->dirty_log_pages,
982 0, &start, &end, EXTENT_DIRTY);
983 if (ret)
984 break;
985
986 clear_extent_dirty(&log_root_tree->dirty_log_pages,
987 start, end, GFP_NOFS);
988 }
Chris Masone02119d2008-09-05 16:13:11 -0400989 eb = fs_info->log_root_tree->node;
990
991 WARN_ON(btrfs_header_level(eb) != 0);
992 WARN_ON(btrfs_header_nritems(eb) != 0);
993
Chris Masond00aff02008-09-11 15:54:42 -0400994 ret = btrfs_free_reserved_extent(fs_info->tree_root,
995 eb->start, eb->len);
Chris Masone02119d2008-09-05 16:13:11 -0400996 BUG_ON(ret);
997
998 free_extent_buffer(eb);
999 kfree(fs_info->log_root_tree);
1000 fs_info->log_root_tree = NULL;
1001 return 0;
1002}
1003
Yan Zheng7237f182009-01-21 12:54:03 -05001004static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
1005 struct btrfs_fs_info *fs_info)
Chris Mason0f7d52f2007-04-09 10:42:37 -04001006{
1007 struct btrfs_root *root;
1008 struct btrfs_root *tree_root = fs_info->tree_root;
Yan Zheng7237f182009-01-21 12:54:03 -05001009 struct extent_buffer *leaf;
Chris Masone02119d2008-09-05 16:13:11 -04001010
1011 root = kzalloc(sizeof(*root), GFP_NOFS);
1012 if (!root)
Yan Zheng7237f182009-01-21 12:54:03 -05001013 return ERR_PTR(-ENOMEM);
Chris Masone02119d2008-09-05 16:13:11 -04001014
1015 __setup_root(tree_root->nodesize, tree_root->leafsize,
1016 tree_root->sectorsize, tree_root->stripesize,
1017 root, fs_info, BTRFS_TREE_LOG_OBJECTID);
1018
1019 root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
1020 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
1021 root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
Yan Zheng7237f182009-01-21 12:54:03 -05001022 /*
1023 * log trees do not get reference counted because they go away
1024 * before a real commit is actually done. They do store pointers
1025 * to file data extents, and those reference counts still get
1026 * updated (along with back refs to the log tree).
1027 */
Chris Masone02119d2008-09-05 16:13:11 -04001028 root->ref_cows = 0;
1029
Yan Zheng5d4f98a2009-06-10 10:45:14 -04001030 leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0,
1031 BTRFS_TREE_LOG_OBJECTID, NULL, 0, 0, 0);
Yan Zheng7237f182009-01-21 12:54:03 -05001032 if (IS_ERR(leaf)) {
1033 kfree(root);
1034 return ERR_CAST(leaf);
1035 }
Chris Masone02119d2008-09-05 16:13:11 -04001036
Yan Zheng5d4f98a2009-06-10 10:45:14 -04001037 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
1038 btrfs_set_header_bytenr(leaf, leaf->start);
1039 btrfs_set_header_generation(leaf, trans->transid);
1040 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
1041 btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID);
Yan Zheng7237f182009-01-21 12:54:03 -05001042 root->node = leaf;
Chris Masone02119d2008-09-05 16:13:11 -04001043
1044 write_extent_buffer(root->node, root->fs_info->fsid,
1045 (unsigned long)btrfs_header_fsid(root->node),
1046 BTRFS_FSID_SIZE);
1047 btrfs_mark_buffer_dirty(root->node);
1048 btrfs_tree_unlock(root->node);
Yan Zheng7237f182009-01-21 12:54:03 -05001049 return root;
1050}
1051
1052int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
1053 struct btrfs_fs_info *fs_info)
1054{
1055 struct btrfs_root *log_root;
1056
1057 log_root = alloc_log_tree(trans, fs_info);
1058 if (IS_ERR(log_root))
1059 return PTR_ERR(log_root);
1060 WARN_ON(fs_info->log_root_tree);
1061 fs_info->log_root_tree = log_root;
1062 return 0;
1063}
1064
1065int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
1066 struct btrfs_root *root)
1067{
1068 struct btrfs_root *log_root;
1069 struct btrfs_inode_item *inode_item;
1070
1071 log_root = alloc_log_tree(trans, root->fs_info);
1072 if (IS_ERR(log_root))
1073 return PTR_ERR(log_root);
1074
1075 log_root->last_trans = trans->transid;
1076 log_root->root_key.offset = root->root_key.objectid;
1077
1078 inode_item = &log_root->root_item.inode;
1079 inode_item->generation = cpu_to_le64(1);
1080 inode_item->size = cpu_to_le64(3);
1081 inode_item->nlink = cpu_to_le32(1);
1082 inode_item->nbytes = cpu_to_le64(root->leafsize);
1083 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
1084
Yan Zheng5d4f98a2009-06-10 10:45:14 -04001085 btrfs_set_root_node(&log_root->root_item, log_root->node);
Yan Zheng7237f182009-01-21 12:54:03 -05001086
1087 WARN_ON(root->log_root);
1088 root->log_root = log_root;
1089 root->log_transid = 0;
Chris Masone02119d2008-09-05 16:13:11 -04001090 return 0;
1091}
1092
1093struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
1094 struct btrfs_key *location)
1095{
1096 struct btrfs_root *root;
1097 struct btrfs_fs_info *fs_info = tree_root->fs_info;
Chris Mason0f7d52f2007-04-09 10:42:37 -04001098 struct btrfs_path *path;
Chris Mason5f39d392007-10-15 16:14:19 -04001099 struct extent_buffer *l;
Yan Zheng84234f32008-10-29 14:49:05 -04001100 u64 generation;
Chris Masondb945352007-10-15 16:15:53 -04001101 u32 blocksize;
Chris Mason0f7d52f2007-04-09 10:42:37 -04001102 int ret = 0;
1103
Chris Mason5eda7b52007-06-22 14:16:25 -04001104 root = kzalloc(sizeof(*root), GFP_NOFS);
Chris Mason0cf6c622007-06-09 09:22:25 -04001105 if (!root)
Chris Mason0f7d52f2007-04-09 10:42:37 -04001106 return ERR_PTR(-ENOMEM);
Chris Mason0f7d52f2007-04-09 10:42:37 -04001107 if (location->offset == (u64)-1) {
Chris Masondb945352007-10-15 16:15:53 -04001108 ret = find_and_setup_root(tree_root, fs_info,
Chris Mason0f7d52f2007-04-09 10:42:37 -04001109 location->objectid, root);
1110 if (ret) {
Chris Mason0f7d52f2007-04-09 10:42:37 -04001111 kfree(root);
1112 return ERR_PTR(ret);
1113 }
Yan, Zheng13a8a7c2009-09-21 15:56:00 -04001114 goto out;
Chris Mason0f7d52f2007-04-09 10:42:37 -04001115 }
1116
Chris Masondb945352007-10-15 16:15:53 -04001117 __setup_root(tree_root->nodesize, tree_root->leafsize,
Chris Mason87ee04e2007-11-30 11:30:34 -05001118 tree_root->sectorsize, tree_root->stripesize,
1119 root, fs_info, location->objectid);
Chris Mason0f7d52f2007-04-09 10:42:37 -04001120
1121 path = btrfs_alloc_path();
1122 BUG_ON(!path);
1123 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
Yan, Zheng13a8a7c2009-09-21 15:56:00 -04001124 if (ret == 0) {
1125 l = path->nodes[0];
1126 read_extent_buffer(l, &root->root_item,
1127 btrfs_item_ptr_offset(l, path->slots[0]),
1128 sizeof(root->root_item));
1129 memcpy(&root->root_key, location, sizeof(*location));
Chris Mason0f7d52f2007-04-09 10:42:37 -04001130 }
Chris Mason0f7d52f2007-04-09 10:42:37 -04001131 btrfs_free_path(path);
1132 if (ret) {
Yan, Zheng13a8a7c2009-09-21 15:56:00 -04001133 if (ret > 0)
1134 ret = -ENOENT;
Chris Mason0f7d52f2007-04-09 10:42:37 -04001135 return ERR_PTR(ret);
1136 }
Yan, Zheng13a8a7c2009-09-21 15:56:00 -04001137
Yan Zheng84234f32008-10-29 14:49:05 -04001138 generation = btrfs_root_generation(&root->root_item);
Chris Masondb945352007-10-15 16:15:53 -04001139 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
1140 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
Yan Zheng84234f32008-10-29 14:49:05 -04001141 blocksize, generation);
Yan Zheng5d4f98a2009-06-10 10:45:14 -04001142 root->commit_root = btrfs_root_node(root);
Chris Mason0f7d52f2007-04-09 10:42:37 -04001143 BUG_ON(!root->node);
Yan, Zheng13a8a7c2009-09-21 15:56:00 -04001144out:
1145 if (location->objectid != BTRFS_TREE_LOG_OBJECTID)
Chris Masone02119d2008-09-05 16:13:11 -04001146 root->ref_cows = 1;
Yan, Zheng13a8a7c2009-09-21 15:56:00 -04001147
Chris Mason5eda7b52007-06-22 14:16:25 -04001148 return root;
1149}
1150
Chris Masondc17ff82008-01-08 15:46:30 -05001151struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
1152 u64 root_objectid)
1153{
1154 struct btrfs_root *root;
1155
1156 if (root_objectid == BTRFS_ROOT_TREE_OBJECTID)
1157 return fs_info->tree_root;
1158 if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID)
1159 return fs_info->extent_root;
1160
1161 root = radix_tree_lookup(&fs_info->fs_roots_radix,
1162 (unsigned long)root_objectid);
1163 return root;
1164}
1165
Chris Masonedbd8d42007-12-21 16:27:24 -05001166struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
1167 struct btrfs_key *location)
Chris Mason5eda7b52007-06-22 14:16:25 -04001168{
1169 struct btrfs_root *root;
1170 int ret;
1171
Chris Masonedbd8d42007-12-21 16:27:24 -05001172 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1173 return fs_info->tree_root;
1174 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
1175 return fs_info->extent_root;
Chris Mason8f18cf12008-04-25 16:53:30 -04001176 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
1177 return fs_info->chunk_root;
1178 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
1179 return fs_info->dev_root;
Yan Zheng0403e472008-12-10 20:32:51 -05001180 if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
1181 return fs_info->csum_root;
Yan, Zheng4df27c4d2009-09-21 15:56:00 -04001182again:
1183 spin_lock(&fs_info->fs_roots_radix_lock);
Chris Mason5eda7b52007-06-22 14:16:25 -04001184 root = radix_tree_lookup(&fs_info->fs_roots_radix,
1185 (unsigned long)location->objectid);
Yan, Zheng4df27c4d2009-09-21 15:56:00 -04001186 spin_unlock(&fs_info->fs_roots_radix_lock);
Chris Mason5eda7b52007-06-22 14:16:25 -04001187 if (root)
1188 return root;
1189
Yan, Zheng4df27c4d2009-09-21 15:56:00 -04001190 ret = btrfs_find_orphan_item(fs_info->tree_root, location->objectid);
1191 if (ret == 0)
1192 ret = -ENOENT;
1193 if (ret < 0)
1194 return ERR_PTR(ret);
1195
Chris Masone02119d2008-09-05 16:13:11 -04001196 root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location);
Chris Mason5eda7b52007-06-22 14:16:25 -04001197 if (IS_ERR(root))
1198 return root;
Chris Mason3394e162008-11-17 20:42:26 -05001199
Yan, Zheng4df27c4d2009-09-21 15:56:00 -04001200 WARN_ON(btrfs_root_refs(&root->root_item) == 0);
Chris Mason3394e162008-11-17 20:42:26 -05001201 set_anon_super(&root->anon_super, NULL);
1202
Yan, Zheng4df27c4d2009-09-21 15:56:00 -04001203 ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM);
1204 if (ret)
1205 goto fail;
1206
1207 spin_lock(&fs_info->fs_roots_radix_lock);
Chris Mason2619ba12007-04-10 16:58:11 -04001208 ret = radix_tree_insert(&fs_info->fs_roots_radix,
1209 (unsigned long)root->root_key.objectid,
Chris Mason0f7d52f2007-04-09 10:42:37 -04001210 root);
Yan, Zheng4df27c4d2009-09-21 15:56:00 -04001211 if (ret == 0)
1212 root->in_radix = 1;
1213 spin_unlock(&fs_info->fs_roots_radix_lock);
1214 radix_tree_preload_end();
Chris Mason0f7d52f2007-04-09 10:42:37 -04001215 if (ret) {
Yan, Zheng4df27c4d2009-09-21 15:56:00 -04001216 if (ret == -EEXIST) {
1217 free_fs_root(root);
1218 goto again;
1219 }
1220 goto fail;
Chris Mason0f7d52f2007-04-09 10:42:37 -04001221 }
Yan, Zheng4df27c4d2009-09-21 15:56:00 -04001222
1223 ret = btrfs_find_dead_roots(fs_info->tree_root,
1224 root->root_key.objectid);
1225 WARN_ON(ret);
1226
1227 if (!(fs_info->sb->s_flags & MS_RDONLY))
Yan Zhengc146afa2008-11-12 14:34:12 -05001228 btrfs_orphan_cleanup(root);
Yan, Zheng4df27c4d2009-09-21 15:56:00 -04001229
Chris Masonedbd8d42007-12-21 16:27:24 -05001230 return root;
Yan, Zheng4df27c4d2009-09-21 15:56:00 -04001231fail:
1232 free_fs_root(root);
1233 return ERR_PTR(ret);
Chris Masonedbd8d42007-12-21 16:27:24 -05001234}
1235
1236struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
1237 struct btrfs_key *location,
1238 const char *name, int namelen)
1239{
Yan, Zheng4df27c4d2009-09-21 15:56:00 -04001240 return btrfs_read_fs_root_no_name(fs_info, location);
1241#if 0
Chris Masonedbd8d42007-12-21 16:27:24 -05001242 struct btrfs_root *root;
1243 int ret;
1244
1245 root = btrfs_read_fs_root_no_name(fs_info, location);
1246 if (!root)
1247 return NULL;
Josef Bacik58176a92007-08-29 15:47:34 -04001248
Chris Mason4313b392008-01-03 09:08:48 -05001249 if (root->in_sysfs)
1250 return root;
1251
Josef Bacik58176a92007-08-29 15:47:34 -04001252 ret = btrfs_set_root_name(root, name, namelen);
1253 if (ret) {
Chris Mason5f39d392007-10-15 16:14:19 -04001254 free_extent_buffer(root->node);
Josef Bacik58176a92007-08-29 15:47:34 -04001255 kfree(root);
1256 return ERR_PTR(ret);
1257 }
Yan, Zheng4df27c4d2009-09-21 15:56:00 -04001258
Josef Bacik58176a92007-08-29 15:47:34 -04001259 ret = btrfs_sysfs_add_root(root);
1260 if (ret) {
Chris Mason5f39d392007-10-15 16:14:19 -04001261 free_extent_buffer(root->node);
Josef Bacik58176a92007-08-29 15:47:34 -04001262 kfree(root->name);
1263 kfree(root);
1264 return ERR_PTR(ret);
1265 }
Chris Mason4313b392008-01-03 09:08:48 -05001266 root->in_sysfs = 1;
Chris Mason0f7d52f2007-04-09 10:42:37 -04001267 return root;
Yan, Zheng4df27c4d2009-09-21 15:56:00 -04001268#endif
Chris Mason0f7d52f2007-04-09 10:42:37 -04001269}
Chris Mason04160082008-03-26 10:28:07 -04001270
1271static int btrfs_congested_fn(void *congested_data, int bdi_bits)
1272{
1273 struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
1274 int ret = 0;
Chris Mason04160082008-03-26 10:28:07 -04001275 struct btrfs_device *device;
1276 struct backing_dev_info *bdi;
Chris Masonb7967db2009-04-27 07:29:04 -04001277
Qinghuang Fengc6e30872009-01-21 10:59:08 -05001278 list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
Chris Masondfe25022008-05-13 13:46:40 -04001279 if (!device->bdev)
1280 continue;
Chris Mason04160082008-03-26 10:28:07 -04001281 bdi = blk_get_backing_dev_info(device->bdev);
1282 if (bdi && bdi_congested(bdi, bdi_bits)) {
1283 ret = 1;
1284 break;
1285 }
1286 }
1287 return ret;
1288}
1289
Chris Mason38b66982008-04-22 09:22:11 -04001290/*
1291 * this unplugs every device on the box, and it is only used when page
1292 * is null
1293 */
1294static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
1295{
Chris Mason38b66982008-04-22 09:22:11 -04001296 struct btrfs_device *device;
1297 struct btrfs_fs_info *info;
1298
1299 info = (struct btrfs_fs_info *)bdi->unplug_io_data;
Qinghuang Fengc6e30872009-01-21 10:59:08 -05001300 list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
Chris Masond20f7042008-12-08 16:58:54 -05001301 if (!device->bdev)
1302 continue;
1303
Chris Mason38b66982008-04-22 09:22:11 -04001304 bdi = blk_get_backing_dev_info(device->bdev);
Chris Masond3977122009-01-05 21:25:51 -05001305 if (bdi->unplug_io_fn)
Chris Mason38b66982008-04-22 09:22:11 -04001306 bdi->unplug_io_fn(bdi, page);
Chris Mason38b66982008-04-22 09:22:11 -04001307 }
1308}
1309
Christoph Hellwigb2950862008-12-02 09:54:17 -05001310static void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
Chris Mason04160082008-03-26 10:28:07 -04001311{
Chris Mason38b66982008-04-22 09:22:11 -04001312 struct inode *inode;
Chris Masonf2d8d742008-04-21 10:03:05 -04001313 struct extent_map_tree *em_tree;
1314 struct extent_map *em;
Chris Masonbcbfce82008-04-22 13:26:47 -04001315 struct address_space *mapping;
Chris Mason38b66982008-04-22 09:22:11 -04001316 u64 offset;
1317
Chris Masonbcbfce82008-04-22 13:26:47 -04001318 /* the generic O_DIRECT read code does this */
Chris Mason9f0ba5b2008-11-18 10:31:22 -05001319 if (1 || !page) {
Chris Mason38b66982008-04-22 09:22:11 -04001320 __unplug_io_fn(bdi, page);
1321 return;
1322 }
1323
Chris Masonbcbfce82008-04-22 13:26:47 -04001324 /*
1325 * page->mapping may change at any time. Get a consistent copy
1326 * and use that for everything below
1327 */
1328 smp_mb();
1329 mapping = page->mapping;
1330 if (!mapping)
1331 return;
1332
1333 inode = mapping->host;
Chris Mason240d5d42008-11-10 13:08:31 -05001334
1335 /*
1336 * don't do the expensive searching for a small number of
1337 * devices
1338 */
1339 if (BTRFS_I(inode)->root->fs_info->fs_devices->open_devices <= 2) {
1340 __unplug_io_fn(bdi, page);
1341 return;
1342 }
1343
Chris Mason38b66982008-04-22 09:22:11 -04001344 offset = page_offset(page);
Chris Mason04160082008-03-26 10:28:07 -04001345
Chris Masonf2d8d742008-04-21 10:03:05 -04001346 em_tree = &BTRFS_I(inode)->extent_tree;
Chris Mason890871b2009-09-02 16:24:52 -04001347 read_lock(&em_tree->lock);
Chris Masonf2d8d742008-04-21 10:03:05 -04001348 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
Chris Mason890871b2009-09-02 16:24:52 -04001349 read_unlock(&em_tree->lock);
Chris Mason89642222008-07-24 09:41:53 -04001350 if (!em) {
1351 __unplug_io_fn(bdi, page);
Chris Masonf2d8d742008-04-21 10:03:05 -04001352 return;
Chris Mason89642222008-07-24 09:41:53 -04001353 }
Chris Masonf2d8d742008-04-21 10:03:05 -04001354
Chris Mason89642222008-07-24 09:41:53 -04001355 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
1356 free_extent_map(em);
1357 __unplug_io_fn(bdi, page);
1358 return;
1359 }
Chris Masonf2d8d742008-04-21 10:03:05 -04001360 offset = offset - em->start;
1361 btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree,
1362 em->block_start + offset, page);
1363 free_extent_map(em);
Chris Mason04160082008-03-26 10:28:07 -04001364}
1365
Jens Axboead081f12009-06-12 14:43:40 +02001366/*
1367 * If this fails, caller must call bdi_destroy() to get rid of the
1368 * bdi again.
1369 */
Chris Mason04160082008-03-26 10:28:07 -04001370static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
1371{
Jens Axboead081f12009-06-12 14:43:40 +02001372 int err;
1373
Jens Axboed9938312009-06-12 14:45:52 +02001374 bdi->name = "btrfs";
Jens Axboead081f12009-06-12 14:43:40 +02001375 bdi->capabilities = BDI_CAP_MAP_COPY;
1376 err = bdi_init(bdi);
1377 if (err)
1378 return err;
1379
1380 err = bdi_register(bdi, NULL, "btrfs-%d",
1381 atomic_inc_return(&btrfs_bdi_num));
Yan, Zheng76dda932009-09-21 16:00:26 -04001382 if (err) {
1383 bdi_destroy(bdi);
Jens Axboead081f12009-06-12 14:43:40 +02001384 return err;
Yan, Zheng76dda932009-09-21 16:00:26 -04001385 }
Jens Axboead081f12009-06-12 14:43:40 +02001386
Chris Mason4575c9c2008-04-18 16:13:31 -04001387 bdi->ra_pages = default_backing_dev_info.ra_pages;
Chris Mason04160082008-03-26 10:28:07 -04001388 bdi->unplug_io_fn = btrfs_unplug_io_fn;
1389 bdi->unplug_io_data = info;
1390 bdi->congested_fn = btrfs_congested_fn;
1391 bdi->congested_data = info;
1392 return 0;
1393}
1394
Chris Masonce9adaa2008-04-09 16:28:12 -04001395static int bio_ready_for_csum(struct bio *bio)
1396{
1397 u64 length = 0;
1398 u64 buf_len = 0;
1399 u64 start = 0;
1400 struct page *page;
1401 struct extent_io_tree *io_tree = NULL;
1402 struct btrfs_fs_info *info = NULL;
1403 struct bio_vec *bvec;
1404 int i;
1405 int ret;
1406
1407 bio_for_each_segment(bvec, bio, i) {
1408 page = bvec->bv_page;
1409 if (page->private == EXTENT_PAGE_PRIVATE) {
1410 length += bvec->bv_len;
1411 continue;
1412 }
1413 if (!page->private) {
1414 length += bvec->bv_len;
1415 continue;
1416 }
1417 length = bvec->bv_len;
1418 buf_len = page->private >> 2;
1419 start = page_offset(page) + bvec->bv_offset;
1420 io_tree = &BTRFS_I(page->mapping->host)->io_tree;
1421 info = BTRFS_I(page->mapping->host)->root->fs_info;
1422 }
1423 /* are we fully contained in this bio? */
1424 if (buf_len <= length)
1425 return 1;
1426
1427 ret = extent_range_uptodate(io_tree, start + length,
1428 start + buf_len - 1);
Chris Masonce9adaa2008-04-09 16:28:12 -04001429 return ret;
1430}
1431
Chris Mason8b712842008-06-11 16:50:36 -04001432/*
1433 * called by the kthread helper functions to finally call the bio end_io
1434 * functions. This is where read checksum verification actually happens
1435 */
1436static void end_workqueue_fn(struct btrfs_work *work)
Chris Masonce9adaa2008-04-09 16:28:12 -04001437{
Chris Masonce9adaa2008-04-09 16:28:12 -04001438 struct bio *bio;
Chris Mason8b712842008-06-11 16:50:36 -04001439 struct end_io_wq *end_io_wq;
1440 struct btrfs_fs_info *fs_info;
Chris Masonce9adaa2008-04-09 16:28:12 -04001441 int error;
Chris Masonce9adaa2008-04-09 16:28:12 -04001442
Chris Mason8b712842008-06-11 16:50:36 -04001443 end_io_wq = container_of(work, struct end_io_wq, work);
1444 bio = end_io_wq->bio;
1445 fs_info = end_io_wq->info;
Chris Masonce9adaa2008-04-09 16:28:12 -04001446
Chris Masoncad321a2008-12-17 14:51:42 -05001447 /* metadata bio reads are special because the whole tree block must
Chris Mason8b712842008-06-11 16:50:36 -04001448 * be checksummed at once. This makes sure the entire block is in
1449 * ram and up to date before trying to verify things. For
1450 * blocksize <= pagesize, it is basically a noop
1451 */
Chris Masoncad321a2008-12-17 14:51:42 -05001452 if (!(bio->bi_rw & (1 << BIO_RW)) && end_io_wq->metadata &&
1453 !bio_ready_for_csum(bio)) {
Chris Masond20f7042008-12-08 16:58:54 -05001454 btrfs_queue_worker(&fs_info->endio_meta_workers,
Chris Mason8b712842008-06-11 16:50:36 -04001455 &end_io_wq->work);
1456 return;
1457 }
1458 error = end_io_wq->error;
1459 bio->bi_private = end_io_wq->private;
1460 bio->bi_end_io = end_io_wq->end_io;
1461 kfree(end_io_wq);
Chris Mason8b712842008-06-11 16:50:36 -04001462 bio_endio(bio, error);
Chris Mason44b8bd72008-04-16 11:14:51 -04001463}
1464
Chris Masona74a4b92008-06-25 16:01:31 -04001465static int cleaner_kthread(void *arg)
1466{
1467 struct btrfs_root *root = arg;
1468
1469 do {
1470 smp_mb();
1471 if (root->fs_info->closing)
1472 break;
1473
1474 vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE);
Yan, Zheng76dda932009-09-21 16:00:26 -04001475
1476 if (!(root->fs_info->sb->s_flags & MS_RDONLY) &&
1477 mutex_trylock(&root->fs_info->cleaner_mutex)) {
1478 btrfs_clean_old_snapshots(root);
1479 mutex_unlock(&root->fs_info->cleaner_mutex);
1480 }
Chris Masona74a4b92008-06-25 16:01:31 -04001481
1482 if (freezing(current)) {
1483 refrigerator();
1484 } else {
1485 smp_mb();
1486 if (root->fs_info->closing)
1487 break;
1488 set_current_state(TASK_INTERRUPTIBLE);
1489 schedule();
1490 __set_current_state(TASK_RUNNING);
1491 }
1492 } while (!kthread_should_stop());
1493 return 0;
1494}
1495
1496static int transaction_kthread(void *arg)
1497{
1498 struct btrfs_root *root = arg;
1499 struct btrfs_trans_handle *trans;
1500 struct btrfs_transaction *cur;
1501 unsigned long now;
1502 unsigned long delay;
1503 int ret;
1504
1505 do {
1506 smp_mb();
1507 if (root->fs_info->closing)
1508 break;
1509
1510 delay = HZ * 30;
1511 vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE);
1512 mutex_lock(&root->fs_info->transaction_kthread_mutex);
1513
1514 mutex_lock(&root->fs_info->trans_mutex);
1515 cur = root->fs_info->running_transaction;
1516 if (!cur) {
1517 mutex_unlock(&root->fs_info->trans_mutex);
1518 goto sleep;
1519 }
Yan Zheng31153d82008-07-28 15:32:19 -04001520
Chris Masona74a4b92008-06-25 16:01:31 -04001521 now = get_seconds();
1522 if (now < cur->start_time || now - cur->start_time < 30) {
1523 mutex_unlock(&root->fs_info->trans_mutex);
1524 delay = HZ * 5;
1525 goto sleep;
1526 }
1527 mutex_unlock(&root->fs_info->trans_mutex);
Chris Masona74a4b92008-06-25 16:01:31 -04001528 trans = btrfs_start_transaction(root, 1);
1529 ret = btrfs_commit_transaction(trans, root);
Chris Mason56bec292009-03-13 10:10:06 -04001530
Chris Masona74a4b92008-06-25 16:01:31 -04001531sleep:
1532 wake_up_process(root->fs_info->cleaner_kthread);
1533 mutex_unlock(&root->fs_info->transaction_kthread_mutex);
1534
1535 if (freezing(current)) {
1536 refrigerator();
1537 } else {
1538 if (root->fs_info->closing)
1539 break;
1540 set_current_state(TASK_INTERRUPTIBLE);
1541 schedule_timeout(delay);
1542 __set_current_state(TASK_RUNNING);
1543 }
1544 } while (!kthread_should_stop());
1545 return 0;
1546}
1547
Chris Mason8a4b83c2008-03-24 15:02:07 -04001548struct btrfs_root *open_ctree(struct super_block *sb,
Chris Masondfe25022008-05-13 13:46:40 -04001549 struct btrfs_fs_devices *fs_devices,
1550 char *options)
Chris Masoneb60cea2007-02-02 09:18:22 -05001551{
Chris Masondb945352007-10-15 16:15:53 -04001552 u32 sectorsize;
1553 u32 nodesize;
1554 u32 leafsize;
1555 u32 blocksize;
Chris Mason87ee04e2007-11-30 11:30:34 -05001556 u32 stripesize;
Yan Zheng84234f32008-10-29 14:49:05 -04001557 u64 generation;
Josef Bacikf2b636e2008-12-02 06:36:08 -05001558 u64 features;
Chris Mason3de45862008-11-17 21:02:50 -05001559 struct btrfs_key location;
Chris Masona061fc82008-05-07 11:43:44 -04001560 struct buffer_head *bh;
Chris Masone02119d2008-09-05 16:13:11 -04001561 struct btrfs_root *extent_root = kzalloc(sizeof(struct btrfs_root),
Chris Masone20d96d2007-03-22 12:13:20 -04001562 GFP_NOFS);
Chris Masond20f7042008-12-08 16:58:54 -05001563 struct btrfs_root *csum_root = kzalloc(sizeof(struct btrfs_root),
1564 GFP_NOFS);
Chris Masone02119d2008-09-05 16:13:11 -04001565 struct btrfs_root *tree_root = kzalloc(sizeof(struct btrfs_root),
Chris Masone20d96d2007-03-22 12:13:20 -04001566 GFP_NOFS);
Chris Mason8790d502008-04-03 16:29:03 -04001567 struct btrfs_fs_info *fs_info = kzalloc(sizeof(*fs_info),
Chris Masone20d96d2007-03-22 12:13:20 -04001568 GFP_NOFS);
Chris Masone02119d2008-09-05 16:13:11 -04001569 struct btrfs_root *chunk_root = kzalloc(sizeof(struct btrfs_root),
Chris Mason0b86a832008-03-24 15:01:56 -04001570 GFP_NOFS);
Chris Masone02119d2008-09-05 16:13:11 -04001571 struct btrfs_root *dev_root = kzalloc(sizeof(struct btrfs_root),
Chris Mason0b86a832008-03-24 15:01:56 -04001572 GFP_NOFS);
Chris Masone02119d2008-09-05 16:13:11 -04001573 struct btrfs_root *log_tree_root;
1574
Chris Masoneb60cea2007-02-02 09:18:22 -05001575 int ret;
Yane58ca022008-04-01 11:21:34 -04001576 int err = -EINVAL;
Chris Mason4543df72008-06-11 21:47:56 -04001577
Chris Mason2c90e5d2007-04-02 10:50:19 -04001578 struct btrfs_super_block *disk_super;
Chris Mason8790d502008-04-03 16:29:03 -04001579
Jim Meyering0463bb42008-10-01 19:09:04 -04001580 if (!extent_root || !tree_root || !fs_info ||
Chris Masond20f7042008-12-08 16:58:54 -05001581 !chunk_root || !dev_root || !csum_root) {
Chris Mason39279cc2007-06-12 06:35:45 -04001582 err = -ENOMEM;
1583 goto fail;
1584 }
Yan, Zheng76dda932009-09-21 16:00:26 -04001585
1586 ret = init_srcu_struct(&fs_info->subvol_srcu);
1587 if (ret) {
1588 err = ret;
1589 goto fail;
1590 }
1591
1592 ret = setup_bdi(fs_info, &fs_info->bdi);
1593 if (ret) {
1594 err = ret;
1595 goto fail_srcu;
1596 }
1597
1598 fs_info->btree_inode = new_inode(sb);
1599 if (!fs_info->btree_inode) {
1600 err = -ENOMEM;
1601 goto fail_bdi;
1602 }
1603
1604 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
Chris Mason8fd17792007-04-19 21:01:03 -04001605 INIT_LIST_HEAD(&fs_info->trans_list);
Chris Masonfacda1e2007-06-08 18:11:48 -04001606 INIT_LIST_HEAD(&fs_info->dead_roots);
Chris Mason19c00dd2007-10-15 16:19:22 -04001607 INIT_LIST_HEAD(&fs_info->hashers);
Chris Masonea8c2812008-08-04 23:17:27 -04001608 INIT_LIST_HEAD(&fs_info->delalloc_inodes);
Chris Mason5a3f23d2009-03-31 13:27:11 -04001609 INIT_LIST_HEAD(&fs_info->ordered_operations);
Yan Zheng11833d62009-09-11 16:11:19 -04001610 INIT_LIST_HEAD(&fs_info->caching_block_groups);
Chris Mason1832a6d2007-12-21 16:27:21 -05001611 spin_lock_init(&fs_info->delalloc_lock);
Chris Masoncee36a02008-01-15 08:40:48 -05001612 spin_lock_init(&fs_info->new_trans_lock);
Yan Zheng31153d82008-07-28 15:32:19 -04001613 spin_lock_init(&fs_info->ref_cache_lock);
Yan, Zheng76dda932009-09-21 16:00:26 -04001614 spin_lock_init(&fs_info->fs_roots_radix_lock);
Chris Mason19c00dd2007-10-15 16:19:22 -04001615
Josef Bacik58176a92007-08-29 15:47:34 -04001616 init_completion(&fs_info->kobj_unregister);
Chris Mason9f5fae22007-03-20 14:38:32 -04001617 fs_info->tree_root = tree_root;
1618 fs_info->extent_root = extent_root;
Chris Masond20f7042008-12-08 16:58:54 -05001619 fs_info->csum_root = csum_root;
Chris Mason0b86a832008-03-24 15:01:56 -04001620 fs_info->chunk_root = chunk_root;
1621 fs_info->dev_root = dev_root;
Chris Mason8a4b83c2008-03-24 15:02:07 -04001622 fs_info->fs_devices = fs_devices;
Chris Mason0b86a832008-03-24 15:01:56 -04001623 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
Chris Mason6324fbf2008-03-24 15:01:59 -04001624 INIT_LIST_HEAD(&fs_info->space_info);
Chris Mason0b86a832008-03-24 15:01:56 -04001625 btrfs_mapping_init(&fs_info->mapping_tree);
Chris Masoncb03c742008-05-15 16:15:45 -04001626 atomic_set(&fs_info->nr_async_submits, 0);
Chris Mason771ed682008-11-06 22:02:51 -05001627 atomic_set(&fs_info->async_delalloc_pages, 0);
Chris Mason8c8bee12008-09-29 11:19:10 -04001628 atomic_set(&fs_info->async_submit_draining, 0);
Chris Mason0986fe92008-08-15 15:34:15 -04001629 atomic_set(&fs_info->nr_async_bios, 0);
Chris Masone20d96d2007-03-22 12:13:20 -04001630 fs_info->sb = sb;
Chris Masonc59f8952007-12-17 20:14:04 -05001631 fs_info->max_extent = (u64)-1;
Chris Mason6f568d32008-01-29 16:03:38 -05001632 fs_info->max_inline = 8192 * 1024;
Josef Bacik9ed74f22009-09-11 16:12:44 -04001633 fs_info->metadata_ratio = 0;
Chris Masonc8b97812008-10-29 14:49:59 -04001634
Chris Masonb34b0862008-12-19 15:43:22 -05001635 fs_info->thread_pool_size = min_t(unsigned long,
1636 num_online_cpus() + 2, 8);
Chris Mason0afbaf82008-04-18 14:17:20 -04001637
Chris Mason3eaa2882008-07-24 11:57:52 -04001638 INIT_LIST_HEAD(&fs_info->ordered_extents);
1639 spin_lock_init(&fs_info->ordered_extent_lock);
1640
Chris Masona061fc82008-05-07 11:43:44 -04001641 sb->s_blocksize = 4096;
1642 sb->s_blocksize_bits = blksize_bits(4096);
Jens Axboe32a88aa2009-09-16 15:02:33 +02001643 sb->s_bdi = &fs_info->bdi;
Chris Masona061fc82008-05-07 11:43:44 -04001644
Yan, Zheng76dda932009-09-21 16:00:26 -04001645 fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID;
1646 fs_info->btree_inode->i_nlink = 1;
Chris Mason0afbaf82008-04-18 14:17:20 -04001647 /*
1648 * we set the i_size on the btree inode to the max possible int.
1649 * the real end of the address space is determined by all of
1650 * the devices in the system
1651 */
1652 fs_info->btree_inode->i_size = OFFSET_MAX;
Chris Masond98237b2007-03-28 13:57:48 -04001653 fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
Chris Mason04160082008-03-26 10:28:07 -04001654 fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi;
1655
Yan Zheng5d4f98a2009-06-10 10:45:14 -04001656 RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node);
Chris Masond1310b22008-01-24 16:13:08 -05001657 extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,
Chris Mason5f39d392007-10-15 16:14:19 -04001658 fs_info->btree_inode->i_mapping,
1659 GFP_NOFS);
Chris Masond1310b22008-01-24 16:13:08 -05001660 extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
1661 GFP_NOFS);
Chris Mason0da54682007-11-07 21:08:01 -05001662
Chris Masond1310b22008-01-24 16:13:08 -05001663 BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops;
1664
Chris Mason0f7d52f2007-04-09 10:42:37 -04001665 BTRFS_I(fs_info->btree_inode)->root = tree_root;
1666 memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
1667 sizeof(struct btrfs_key));
Yan, Zheng76dda932009-09-21 16:00:26 -04001668 BTRFS_I(fs_info->btree_inode)->dummy_inode = 1;
Chris Mason22b0ebd2007-03-30 08:47:31 -04001669 insert_inode_hash(fs_info->btree_inode);
Chris Mason39279cc2007-06-12 06:35:45 -04001670
Chris Masone02119d2008-09-05 16:13:11 -04001671 spin_lock_init(&fs_info->block_group_cache_lock);
Chris Masona2135012008-06-25 16:01:30 -04001672 fs_info->block_group_cache_tree.rb_node = NULL;
Chris Mason925baed2008-06-25 16:01:30 -04001673
Yan Zheng11833d62009-09-11 16:11:19 -04001674 extent_io_tree_init(&fs_info->freed_extents[0],
Chris Mason7d9eb122008-07-08 14:19:17 -04001675 fs_info->btree_inode->i_mapping, GFP_NOFS);
Yan Zheng11833d62009-09-11 16:11:19 -04001676 extent_io_tree_init(&fs_info->freed_extents[1],
1677 fs_info->btree_inode->i_mapping, GFP_NOFS);
1678 fs_info->pinned_extents = &fs_info->freed_extents[0];
Chris Masone6dcd2d2008-07-17 12:53:50 -04001679 fs_info->do_barriers = 1;
Chris Masonf9295742008-07-17 12:54:14 -04001680
Chris Masond98237b2007-03-28 13:57:48 -04001681
Chris Mason509659c2007-05-10 12:36:17 -04001682 mutex_init(&fs_info->trans_mutex);
Chris Mason5a3f23d2009-03-31 13:27:11 -04001683 mutex_init(&fs_info->ordered_operations_mutex);
Chris Mason30ae8462007-03-29 09:59:15 -04001684 mutex_init(&fs_info->tree_log_mutex);
Chris Mason925baed2008-06-25 16:01:30 -04001685 mutex_init(&fs_info->chunk_mutex);
1686 mutex_init(&fs_info->transaction_kthread_mutex);
Chris Masona74a4b92008-06-25 16:01:31 -04001687 mutex_init(&fs_info->cleaner_mutex);
1688 mutex_init(&fs_info->volume_mutex);
Yan Zheng276e6802009-07-30 09:40:40 -04001689 init_rwsem(&fs_info->extent_commit_sem);
Yan, Zheng76dda932009-09-21 16:00:26 -04001690 init_rwsem(&fs_info->subvol_sem);
Chris Masonfa9c0d72009-04-03 09:47:43 -04001691
1692 btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);
1693 btrfs_init_free_cluster(&fs_info->data_alloc_cluster);
1694
Chris Mason3768f362007-03-13 16:47:54 -04001695 init_waitqueue_head(&fs_info->transaction_throttle);
Chris Mason19c00dd2007-10-15 16:19:22 -04001696 init_waitqueue_head(&fs_info->transaction_wait);
Chris Mason4854ddd2008-08-15 15:34:17 -04001697 init_waitqueue_head(&fs_info->async_submit_wait);
Chris Mason9a8dd152007-02-23 08:38:36 -05001698
Chris Mason0b86a832008-03-24 15:01:56 -04001699 __setup_root(4096, 4096, 4096, 4096, tree_root,
Chris Mason2c90e5d2007-04-02 10:50:19 -04001700 fs_info, BTRFS_ROOT_TREE_OBJECTID);
Chris Mason7eccb902007-04-11 15:53:25 -04001701
Chris Masond98237b2007-03-28 13:57:48 -04001702
Yan Zhenga512bbf2008-12-08 16:46:26 -05001703 bh = btrfs_read_dev_super(fs_devices->latest_bdev);
Chris Masona061fc82008-05-07 11:43:44 -04001704 if (!bh)
Chris Mason39279cc2007-06-12 06:35:45 -04001705 goto fail_iput;
Chris Mason39279cc2007-06-12 06:35:45 -04001706
Chris Masona061fc82008-05-07 11:43:44 -04001707 memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy));
Yan Zheng2d69a0f2009-01-05 15:43:42 -05001708 memcpy(&fs_info->super_for_commit, &fs_info->super_copy,
1709 sizeof(fs_info->super_for_commit));
Chris Masona061fc82008-05-07 11:43:44 -04001710 brelse(bh);
Chris Mason5f39d392007-10-15 16:14:19 -04001711
Chris Masona061fc82008-05-07 11:43:44 -04001712 memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE);
Chris Mason0b86a832008-03-24 15:01:56 -04001713
Chris Mason5f39d392007-10-15 16:14:19 -04001714 disk_super = &fs_info->super_copy;
Chris Mason0f7d52f2007-04-09 10:42:37 -04001715 if (!btrfs_super_root(disk_super))
Josef Bacikc6e2bac2008-12-02 06:36:10 -05001716 goto fail_iput;
Chris Mason0f7d52f2007-04-09 10:42:37 -04001717
Yan Zheng2b820322008-11-17 21:11:30 -05001718 ret = btrfs_parse_options(tree_root, options);
1719 if (ret) {
1720 err = ret;
Josef Bacikc6e2bac2008-12-02 06:36:10 -05001721 goto fail_iput;
Yan Zheng2b820322008-11-17 21:11:30 -05001722 }
Chris Masondfe25022008-05-13 13:46:40 -04001723
Josef Bacikf2b636e2008-12-02 06:36:08 -05001724 features = btrfs_super_incompat_flags(disk_super) &
1725 ~BTRFS_FEATURE_INCOMPAT_SUPP;
1726 if (features) {
1727 printk(KERN_ERR "BTRFS: couldn't mount because of "
1728 "unsupported optional features (%Lx).\n",
Joel Becker21380932009-04-21 12:38:29 -07001729 (unsigned long long)features);
Josef Bacikf2b636e2008-12-02 06:36:08 -05001730 err = -EINVAL;
Josef Bacikc6e2bac2008-12-02 06:36:10 -05001731 goto fail_iput;
Josef Bacikf2b636e2008-12-02 06:36:08 -05001732 }
1733
Yan Zheng5d4f98a2009-06-10 10:45:14 -04001734 features = btrfs_super_incompat_flags(disk_super);
1735 if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
1736 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
1737 btrfs_set_super_incompat_flags(disk_super, features);
1738 }
1739
Josef Bacikf2b636e2008-12-02 06:36:08 -05001740 features = btrfs_super_compat_ro_flags(disk_super) &
1741 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
1742 if (!(sb->s_flags & MS_RDONLY) && features) {
1743 printk(KERN_ERR "BTRFS: couldn't mount RDWR because of "
1744 "unsupported option features (%Lx).\n",
Joel Becker21380932009-04-21 12:38:29 -07001745 (unsigned long long)features);
Josef Bacikf2b636e2008-12-02 06:36:08 -05001746 err = -EINVAL;
Josef Bacikc6e2bac2008-12-02 06:36:10 -05001747 goto fail_iput;
Josef Bacikf2b636e2008-12-02 06:36:08 -05001748 }
Chris Mason90428462009-08-04 16:56:34 -04001749printk("thread pool is %d\n", fs_info->thread_pool_size);
Chris Mason4543df72008-06-11 21:47:56 -04001750 /*
1751 * we need to start all the end_io workers up front because the
1752 * queue work function gets called at interrupt time, and so it
1753 * cannot dynamically grow.
1754 */
Chris Mason5443be42008-08-15 15:34:16 -04001755 btrfs_init_workers(&fs_info->workers, "worker",
1756 fs_info->thread_pool_size);
Chris Masonc8b97812008-10-29 14:49:59 -04001757
Chris Mason771ed682008-11-06 22:02:51 -05001758 btrfs_init_workers(&fs_info->delalloc_workers, "delalloc",
1759 fs_info->thread_pool_size);
1760
Chris Mason5443be42008-08-15 15:34:16 -04001761 btrfs_init_workers(&fs_info->submit_workers, "submit",
Chris Masonb720d202008-08-15 15:34:14 -04001762 min_t(u64, fs_devices->num_devices,
1763 fs_info->thread_pool_size));
Chris Mason61b49442008-07-31 15:42:53 -04001764
1765 /* a higher idle thresh on the submit workers makes it much more
1766 * likely that bios will be send down in a sane order to the
1767 * devices
1768 */
1769 fs_info->submit_workers.idle_thresh = 64;
Chris Mason53863232008-08-15 15:34:18 -04001770
Chris Mason771ed682008-11-06 22:02:51 -05001771 fs_info->workers.idle_thresh = 16;
Chris Mason4a69a412008-11-06 22:03:00 -05001772 fs_info->workers.ordered = 1;
Chris Mason61b49442008-07-31 15:42:53 -04001773
Chris Mason771ed682008-11-06 22:02:51 -05001774 fs_info->delalloc_workers.idle_thresh = 2;
1775 fs_info->delalloc_workers.ordered = 1;
1776
Chris Mason5443be42008-08-15 15:34:16 -04001777 btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1);
1778 btrfs_init_workers(&fs_info->endio_workers, "endio",
1779 fs_info->thread_pool_size);
Chris Masond20f7042008-12-08 16:58:54 -05001780 btrfs_init_workers(&fs_info->endio_meta_workers, "endio-meta",
1781 fs_info->thread_pool_size);
Chris Masoncad321a2008-12-17 14:51:42 -05001782 btrfs_init_workers(&fs_info->endio_meta_write_workers,
1783 "endio-meta-write", fs_info->thread_pool_size);
Chris Mason5443be42008-08-15 15:34:16 -04001784 btrfs_init_workers(&fs_info->endio_write_workers, "endio-write",
Chris Masone6dcd2d2008-07-17 12:53:50 -04001785 fs_info->thread_pool_size);
Chris Mason61b49442008-07-31 15:42:53 -04001786
1787 /*
1788 * endios are largely parallel and should have a very
1789 * low idle thresh
1790 */
1791 fs_info->endio_workers.idle_thresh = 4;
Chris Masonb51912c2009-02-04 09:23:24 -05001792 fs_info->endio_meta_workers.idle_thresh = 4;
1793
Chris Mason90428462009-08-04 16:56:34 -04001794 fs_info->endio_write_workers.idle_thresh = 2;
1795 fs_info->endio_meta_write_workers.idle_thresh = 2;
1796
1797 fs_info->endio_workers.atomic_worker_start = 1;
1798 fs_info->endio_meta_workers.atomic_worker_start = 1;
1799 fs_info->endio_write_workers.atomic_worker_start = 1;
1800 fs_info->endio_meta_write_workers.atomic_worker_start = 1;
Chris Mason61b49442008-07-31 15:42:53 -04001801
Chris Mason4543df72008-06-11 21:47:56 -04001802 btrfs_start_workers(&fs_info->workers, 1);
Chris Mason1cc127b2008-06-12 14:46:17 -04001803 btrfs_start_workers(&fs_info->submit_workers, 1);
Chris Mason771ed682008-11-06 22:02:51 -05001804 btrfs_start_workers(&fs_info->delalloc_workers, 1);
Chris Mason247e7432008-07-17 12:53:51 -04001805 btrfs_start_workers(&fs_info->fixup_workers, 1);
Chris Mason90428462009-08-04 16:56:34 -04001806 btrfs_start_workers(&fs_info->endio_workers, 1);
1807 btrfs_start_workers(&fs_info->endio_meta_workers, 1);
1808 btrfs_start_workers(&fs_info->endio_meta_write_workers, 1);
1809 btrfs_start_workers(&fs_info->endio_write_workers, 1);
Chris Mason4543df72008-06-11 21:47:56 -04001810
Chris Mason4575c9c2008-04-18 16:13:31 -04001811 fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super);
Chris Masonc8b97812008-10-29 14:49:59 -04001812 fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages,
1813 4 * 1024 * 1024 / PAGE_CACHE_SIZE);
Chris Mason4575c9c2008-04-18 16:13:31 -04001814
Chris Masondb945352007-10-15 16:15:53 -04001815 nodesize = btrfs_super_nodesize(disk_super);
1816 leafsize = btrfs_super_leafsize(disk_super);
1817 sectorsize = btrfs_super_sectorsize(disk_super);
Chris Mason87ee04e2007-11-30 11:30:34 -05001818 stripesize = btrfs_super_stripesize(disk_super);
Chris Masondb945352007-10-15 16:15:53 -04001819 tree_root->nodesize = nodesize;
1820 tree_root->leafsize = leafsize;
1821 tree_root->sectorsize = sectorsize;
Chris Mason87ee04e2007-11-30 11:30:34 -05001822 tree_root->stripesize = stripesize;
Chris Masona061fc82008-05-07 11:43:44 -04001823
1824 sb->s_blocksize = sectorsize;
1825 sb->s_blocksize_bits = blksize_bits(sectorsize);
Chris Masondb945352007-10-15 16:15:53 -04001826
Chris Mason39279cc2007-06-12 06:35:45 -04001827 if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
1828 sizeof(disk_super->magic))) {
Chris Masond3977122009-01-05 21:25:51 -05001829 printk(KERN_INFO "btrfs: valid FS not found on %s\n", sb->s_id);
Chris Mason39279cc2007-06-12 06:35:45 -04001830 goto fail_sb_buffer;
1831 }
Chris Mason19c00dd2007-10-15 16:19:22 -04001832
Chris Mason925baed2008-06-25 16:01:30 -04001833 mutex_lock(&fs_info->chunk_mutex);
Yan Zhenge4404d62008-12-12 10:03:26 -05001834 ret = btrfs_read_sys_array(tree_root);
Chris Mason925baed2008-06-25 16:01:30 -04001835 mutex_unlock(&fs_info->chunk_mutex);
Chris Mason84eed902008-04-25 09:04:37 -04001836 if (ret) {
Chris Masond3977122009-01-05 21:25:51 -05001837 printk(KERN_WARNING "btrfs: failed to read the system "
1838 "array on %s\n", sb->s_id);
Yan Zheng5d4f98a2009-06-10 10:45:14 -04001839 goto fail_sb_buffer;
Chris Mason84eed902008-04-25 09:04:37 -04001840 }
Chris Mason0b86a832008-03-24 15:01:56 -04001841
1842 blocksize = btrfs_level_size(tree_root,
1843 btrfs_super_chunk_root_level(disk_super));
Yan Zheng84234f32008-10-29 14:49:05 -04001844 generation = btrfs_super_chunk_root_generation(disk_super);
Chris Mason0b86a832008-03-24 15:01:56 -04001845
1846 __setup_root(nodesize, leafsize, sectorsize, stripesize,
1847 chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
1848
1849 chunk_root->node = read_tree_block(chunk_root,
1850 btrfs_super_chunk_root(disk_super),
Yan Zheng84234f32008-10-29 14:49:05 -04001851 blocksize, generation);
Chris Mason0b86a832008-03-24 15:01:56 -04001852 BUG_ON(!chunk_root->node);
David Woodhouse83121942009-07-22 16:52:13 -04001853 if (!test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) {
1854 printk(KERN_WARNING "btrfs: failed to read chunk root on %s\n",
1855 sb->s_id);
1856 goto fail_chunk_root;
1857 }
Yan Zheng5d4f98a2009-06-10 10:45:14 -04001858 btrfs_set_root_node(&chunk_root->root_item, chunk_root->node);
1859 chunk_root->commit_root = btrfs_root_node(chunk_root);
Chris Mason0b86a832008-03-24 15:01:56 -04001860
Chris Masone17cade2008-04-15 15:41:47 -04001861 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
Chris Masond3977122009-01-05 21:25:51 -05001862 (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
1863 BTRFS_UUID_SIZE);
Chris Masone17cade2008-04-15 15:41:47 -04001864
Chris Mason925baed2008-06-25 16:01:30 -04001865 mutex_lock(&fs_info->chunk_mutex);
Chris Mason0b86a832008-03-24 15:01:56 -04001866 ret = btrfs_read_chunk_tree(chunk_root);
Chris Mason925baed2008-06-25 16:01:30 -04001867 mutex_unlock(&fs_info->chunk_mutex);
Yan Zheng2b820322008-11-17 21:11:30 -05001868 if (ret) {
Chris Masond3977122009-01-05 21:25:51 -05001869 printk(KERN_WARNING "btrfs: failed to read chunk tree on %s\n",
1870 sb->s_id);
Yan Zheng2b820322008-11-17 21:11:30 -05001871 goto fail_chunk_root;
1872 }
Chris Mason0b86a832008-03-24 15:01:56 -04001873
Chris Masondfe25022008-05-13 13:46:40 -04001874 btrfs_close_extra_devices(fs_devices);
1875
Chris Masondb945352007-10-15 16:15:53 -04001876 blocksize = btrfs_level_size(tree_root,
1877 btrfs_super_root_level(disk_super));
Yan Zheng84234f32008-10-29 14:49:05 -04001878 generation = btrfs_super_generation(disk_super);
Chris Mason0b86a832008-03-24 15:01:56 -04001879
Chris Masone20d96d2007-03-22 12:13:20 -04001880 tree_root->node = read_tree_block(tree_root,
Chris Masondb945352007-10-15 16:15:53 -04001881 btrfs_super_root(disk_super),
Yan Zheng84234f32008-10-29 14:49:05 -04001882 blocksize, generation);
Chris Mason39279cc2007-06-12 06:35:45 -04001883 if (!tree_root->node)
Yan Zheng2b820322008-11-17 21:11:30 -05001884 goto fail_chunk_root;
David Woodhouse83121942009-07-22 16:52:13 -04001885 if (!test_bit(EXTENT_BUFFER_UPTODATE, &tree_root->node->bflags)) {
1886 printk(KERN_WARNING "btrfs: failed to read tree root on %s\n",
1887 sb->s_id);
1888 goto fail_tree_root;
1889 }
Yan Zheng5d4f98a2009-06-10 10:45:14 -04001890 btrfs_set_root_node(&tree_root->root_item, tree_root->node);
1891 tree_root->commit_root = btrfs_root_node(tree_root);
Chris Masondb945352007-10-15 16:15:53 -04001892
1893 ret = find_and_setup_root(tree_root, fs_info,
Chris Masone20d96d2007-03-22 12:13:20 -04001894 BTRFS_EXTENT_TREE_OBJECTID, extent_root);
Chris Mason0b86a832008-03-24 15:01:56 -04001895 if (ret)
Chris Mason39279cc2007-06-12 06:35:45 -04001896 goto fail_tree_root;
Chris Mason0b86a832008-03-24 15:01:56 -04001897 extent_root->track_dirty = 1;
1898
1899 ret = find_and_setup_root(tree_root, fs_info,
1900 BTRFS_DEV_TREE_OBJECTID, dev_root);
Chris Mason0b86a832008-03-24 15:01:56 -04001901 if (ret)
1902 goto fail_extent_root;
Yan Zheng5d4f98a2009-06-10 10:45:14 -04001903 dev_root->track_dirty = 1;
Chris Mason3768f362007-03-13 16:47:54 -04001904
Chris Masond20f7042008-12-08 16:58:54 -05001905 ret = find_and_setup_root(tree_root, fs_info,
1906 BTRFS_CSUM_TREE_OBJECTID, csum_root);
1907 if (ret)
Yan Zheng5d4f98a2009-06-10 10:45:14 -04001908 goto fail_dev_root;
Chris Masond20f7042008-12-08 16:58:54 -05001909
1910 csum_root->track_dirty = 1;
1911
Chris Mason9078a3e2007-04-26 16:46:15 -04001912 btrfs_read_block_groups(extent_root);
1913
Yan Zheng2d69a0f2009-01-05 15:43:42 -05001914 fs_info->generation = generation;
Yan Zhengc146afa2008-11-12 14:34:12 -05001915 fs_info->last_trans_committed = generation;
Chris Masond18a2c42008-04-04 15:40:00 -04001916 fs_info->data_alloc_profile = (u64)-1;
1917 fs_info->metadata_alloc_profile = (u64)-1;
1918 fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
Chris Masona74a4b92008-06-25 16:01:31 -04001919 fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root,
1920 "btrfs-cleaner");
Qinghuang Feng57506d52009-01-21 10:49:16 -05001921 if (IS_ERR(fs_info->cleaner_kthread))
Chris Masond20f7042008-12-08 16:58:54 -05001922 goto fail_csum_root;
Chris Masona74a4b92008-06-25 16:01:31 -04001923
1924 fs_info->transaction_kthread = kthread_run(transaction_kthread,
1925 tree_root,
1926 "btrfs-transaction");
Qinghuang Feng57506d52009-01-21 10:49:16 -05001927 if (IS_ERR(fs_info->transaction_kthread))
Chris Mason3f157a22008-06-25 16:01:31 -04001928 goto fail_cleaner;
Chris Masona74a4b92008-06-25 16:01:31 -04001929
Chris Masonc2898112009-06-10 09:51:32 -04001930 if (!btrfs_test_opt(tree_root, SSD) &&
1931 !btrfs_test_opt(tree_root, NOSSD) &&
1932 !fs_info->fs_devices->rotating) {
1933 printk(KERN_INFO "Btrfs detected SSD devices, enabling SSD "
1934 "mode\n");
1935 btrfs_set_opt(fs_info->mount_opt, SSD);
1936 }
1937
Chris Masone02119d2008-09-05 16:13:11 -04001938 if (btrfs_super_log_root(disk_super) != 0) {
Chris Masone02119d2008-09-05 16:13:11 -04001939 u64 bytenr = btrfs_super_log_root(disk_super);
Chris Masond18a2c42008-04-04 15:40:00 -04001940
Chris Mason7c2ca462008-11-19 15:13:35 -05001941 if (fs_devices->rw_devices == 0) {
Chris Masond3977122009-01-05 21:25:51 -05001942 printk(KERN_WARNING "Btrfs log replay required "
1943 "on RO media\n");
Chris Mason7c2ca462008-11-19 15:13:35 -05001944 err = -EIO;
1945 goto fail_trans_kthread;
1946 }
Chris Masone02119d2008-09-05 16:13:11 -04001947 blocksize =
1948 btrfs_level_size(tree_root,
1949 btrfs_super_log_root_level(disk_super));
1950
1951 log_tree_root = kzalloc(sizeof(struct btrfs_root),
1952 GFP_NOFS);
1953
1954 __setup_root(nodesize, leafsize, sectorsize, stripesize,
1955 log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
1956
1957 log_tree_root->node = read_tree_block(tree_root, bytenr,
Yan Zheng84234f32008-10-29 14:49:05 -04001958 blocksize,
1959 generation + 1);
Chris Masone02119d2008-09-05 16:13:11 -04001960 ret = btrfs_recover_log_trees(log_tree_root);
1961 BUG_ON(ret);
Yan Zhenge556ce22008-11-20 10:25:19 -05001962
1963 if (sb->s_flags & MS_RDONLY) {
1964 ret = btrfs_commit_super(tree_root);
1965 BUG_ON(ret);
1966 }
Chris Masone02119d2008-09-05 16:13:11 -04001967 }
Zheng Yan1a40e232008-09-26 10:09:34 -04001968
Yan, Zheng76dda932009-09-21 16:00:26 -04001969 ret = btrfs_find_orphan_roots(tree_root);
1970 BUG_ON(ret);
1971
Chris Mason7c2ca462008-11-19 15:13:35 -05001972 if (!(sb->s_flags & MS_RDONLY)) {
Yan Zheng5d4f98a2009-06-10 10:45:14 -04001973 ret = btrfs_recover_relocation(tree_root);
Chris Mason7c2ca462008-11-19 15:13:35 -05001974 BUG_ON(ret);
1975 }
Zheng Yan1a40e232008-09-26 10:09:34 -04001976
Chris Mason3de45862008-11-17 21:02:50 -05001977 location.objectid = BTRFS_FS_TREE_OBJECTID;
1978 location.type = BTRFS_ROOT_ITEM_KEY;
1979 location.offset = (u64)-1;
1980
Chris Mason3de45862008-11-17 21:02:50 -05001981 fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location);
1982 if (!fs_info->fs_root)
Chris Mason7c2ca462008-11-19 15:13:35 -05001983 goto fail_trans_kthread;
Chris Masonc2898112009-06-10 09:51:32 -04001984
Chris Mason0f7d52f2007-04-09 10:42:37 -04001985 return tree_root;
Chris Mason39279cc2007-06-12 06:35:45 -04001986
Chris Mason7c2ca462008-11-19 15:13:35 -05001987fail_trans_kthread:
1988 kthread_stop(fs_info->transaction_kthread);
Chris Mason3f157a22008-06-25 16:01:31 -04001989fail_cleaner:
Chris Masona74a4b92008-06-25 16:01:31 -04001990 kthread_stop(fs_info->cleaner_kthread);
Chris Mason7c2ca462008-11-19 15:13:35 -05001991
1992 /*
1993 * make sure we're done with the btree inode before we stop our
1994 * kthreads
1995 */
1996 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
1997 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
1998
Chris Masond20f7042008-12-08 16:58:54 -05001999fail_csum_root:
2000 free_extent_buffer(csum_root->node);
Yan Zheng5d4f98a2009-06-10 10:45:14 -04002001 free_extent_buffer(csum_root->commit_root);
2002fail_dev_root:
2003 free_extent_buffer(dev_root->node);
2004 free_extent_buffer(dev_root->commit_root);
Chris Mason0b86a832008-03-24 15:01:56 -04002005fail_extent_root:
2006 free_extent_buffer(extent_root->node);
Yan Zheng5d4f98a2009-06-10 10:45:14 -04002007 free_extent_buffer(extent_root->commit_root);
Chris Mason39279cc2007-06-12 06:35:45 -04002008fail_tree_root:
Chris Mason5f39d392007-10-15 16:14:19 -04002009 free_extent_buffer(tree_root->node);
Yan Zheng5d4f98a2009-06-10 10:45:14 -04002010 free_extent_buffer(tree_root->commit_root);
Yan Zheng2b820322008-11-17 21:11:30 -05002011fail_chunk_root:
2012 free_extent_buffer(chunk_root->node);
Yan Zheng5d4f98a2009-06-10 10:45:14 -04002013 free_extent_buffer(chunk_root->commit_root);
Chris Mason39279cc2007-06-12 06:35:45 -04002014fail_sb_buffer:
Chris Mason247e7432008-07-17 12:53:51 -04002015 btrfs_stop_workers(&fs_info->fixup_workers);
Chris Mason771ed682008-11-06 22:02:51 -05002016 btrfs_stop_workers(&fs_info->delalloc_workers);
Chris Mason8b712842008-06-11 16:50:36 -04002017 btrfs_stop_workers(&fs_info->workers);
2018 btrfs_stop_workers(&fs_info->endio_workers);
Chris Masond20f7042008-12-08 16:58:54 -05002019 btrfs_stop_workers(&fs_info->endio_meta_workers);
Chris Masoncad321a2008-12-17 14:51:42 -05002020 btrfs_stop_workers(&fs_info->endio_meta_write_workers);
Chris Masone6dcd2d2008-07-17 12:53:50 -04002021 btrfs_stop_workers(&fs_info->endio_write_workers);
Chris Mason1cc127b2008-06-12 14:46:17 -04002022 btrfs_stop_workers(&fs_info->submit_workers);
Chris Mason4543df72008-06-11 21:47:56 -04002023fail_iput:
Chris Mason7c2ca462008-11-19 15:13:35 -05002024 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
Chris Mason4543df72008-06-11 21:47:56 -04002025 iput(fs_info->btree_inode);
Qinghuang Feng7e662852009-01-21 10:49:16 -05002026
Chris Masondfe25022008-05-13 13:46:40 -04002027 btrfs_close_devices(fs_info->fs_devices);
Chris Mason84eed902008-04-25 09:04:37 -04002028 btrfs_mapping_tree_free(&fs_info->mapping_tree);
Jens Axboead081f12009-06-12 14:43:40 +02002029fail_bdi:
Qinghuang Feng7e662852009-01-21 10:49:16 -05002030 bdi_destroy(&fs_info->bdi);
Yan, Zheng76dda932009-09-21 16:00:26 -04002031fail_srcu:
2032 cleanup_srcu_struct(&fs_info->subvol_srcu);
Qinghuang Feng7e662852009-01-21 10:49:16 -05002033fail:
Chris Mason39279cc2007-06-12 06:35:45 -04002034 kfree(extent_root);
2035 kfree(tree_root);
2036 kfree(fs_info);
Jim Meyering83afeac2008-10-01 19:09:51 -04002037 kfree(chunk_root);
2038 kfree(dev_root);
Chris Masond20f7042008-12-08 16:58:54 -05002039 kfree(csum_root);
Chris Mason39279cc2007-06-12 06:35:45 -04002040 return ERR_PTR(err);
Chris Masoneb60cea2007-02-02 09:18:22 -05002041}
2042
Chris Masonf2984462008-04-10 16:19:33 -04002043static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
2044{
2045 char b[BDEVNAME_SIZE];
2046
2047 if (uptodate) {
2048 set_buffer_uptodate(bh);
2049 } else {
2050 if (!buffer_eopnotsupp(bh) && printk_ratelimit()) {
2051 printk(KERN_WARNING "lost page write due to "
2052 "I/O error on %s\n",
2053 bdevname(bh->b_bdev, b));
2054 }
Chris Mason1259ab72008-05-12 13:39:03 -04002055 /* note, we dont' set_buffer_write_io_error because we have
2056 * our own ways of dealing with the IO errors
2057 */
Chris Masonf2984462008-04-10 16:19:33 -04002058 clear_buffer_uptodate(bh);
2059 }
2060 unlock_buffer(bh);
2061 put_bh(bh);
2062}
2063
Yan Zhenga512bbf2008-12-08 16:46:26 -05002064struct buffer_head *btrfs_read_dev_super(struct block_device *bdev)
2065{
2066 struct buffer_head *bh;
2067 struct buffer_head *latest = NULL;
2068 struct btrfs_super_block *super;
2069 int i;
2070 u64 transid = 0;
2071 u64 bytenr;
2072
2073 /* we would like to check all the supers, but that would make
2074 * a btrfs mount succeed after a mkfs from a different FS.
2075 * So, we need to add a special mount option to scan for
2076 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
2077 */
2078 for (i = 0; i < 1; i++) {
2079 bytenr = btrfs_sb_offset(i);
2080 if (bytenr + 4096 >= i_size_read(bdev->bd_inode))
2081 break;
2082 bh = __bread(bdev, bytenr / 4096, 4096);
2083 if (!bh)
2084 continue;
2085
2086 super = (struct btrfs_super_block *)bh->b_data;
2087 if (btrfs_super_bytenr(super) != bytenr ||
2088 strncmp((char *)(&super->magic), BTRFS_MAGIC,
2089 sizeof(super->magic))) {
2090 brelse(bh);
2091 continue;
2092 }
2093
2094 if (!latest || btrfs_super_generation(super) > transid) {
2095 brelse(latest);
2096 latest = bh;
2097 transid = btrfs_super_generation(super);
2098 } else {
2099 brelse(bh);
2100 }
2101 }
2102 return latest;
2103}
2104
Hisashi Hifumi4eedeb72009-06-10 15:28:55 -04002105/*
2106 * this should be called twice, once with wait == 0 and
2107 * once with wait == 1. When wait == 0 is done, all the buffer heads
2108 * we write are pinned.
2109 *
2110 * They are released when wait == 1 is done.
2111 * max_mirrors must be the same for both runs, and it indicates how
2112 * many supers on this one device should be written.
2113 *
2114 * max_mirrors == 0 means to write them all.
2115 */
Yan Zhenga512bbf2008-12-08 16:46:26 -05002116static int write_dev_supers(struct btrfs_device *device,
2117 struct btrfs_super_block *sb,
2118 int do_barriers, int wait, int max_mirrors)
2119{
2120 struct buffer_head *bh;
2121 int i;
2122 int ret;
2123 int errors = 0;
2124 u32 crc;
2125 u64 bytenr;
2126 int last_barrier = 0;
2127
2128 if (max_mirrors == 0)
2129 max_mirrors = BTRFS_SUPER_MIRROR_MAX;
2130
2131 /* make sure only the last submit_bh does a barrier */
2132 if (do_barriers) {
2133 for (i = 0; i < max_mirrors; i++) {
2134 bytenr = btrfs_sb_offset(i);
2135 if (bytenr + BTRFS_SUPER_INFO_SIZE >=
2136 device->total_bytes)
2137 break;
2138 last_barrier = i;
2139 }
2140 }
2141
2142 for (i = 0; i < max_mirrors; i++) {
2143 bytenr = btrfs_sb_offset(i);
2144 if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes)
2145 break;
2146
2147 if (wait) {
2148 bh = __find_get_block(device->bdev, bytenr / 4096,
2149 BTRFS_SUPER_INFO_SIZE);
2150 BUG_ON(!bh);
Yan Zhenga512bbf2008-12-08 16:46:26 -05002151 wait_on_buffer(bh);
Hisashi Hifumi4eedeb72009-06-10 15:28:55 -04002152 if (!buffer_uptodate(bh))
2153 errors++;
2154
2155 /* drop our reference */
2156 brelse(bh);
2157
2158 /* drop the reference from the wait == 0 run */
2159 brelse(bh);
2160 continue;
Yan Zhenga512bbf2008-12-08 16:46:26 -05002161 } else {
2162 btrfs_set_super_bytenr(sb, bytenr);
2163
2164 crc = ~(u32)0;
2165 crc = btrfs_csum_data(NULL, (char *)sb +
2166 BTRFS_CSUM_SIZE, crc,
2167 BTRFS_SUPER_INFO_SIZE -
2168 BTRFS_CSUM_SIZE);
2169 btrfs_csum_final(crc, sb->csum);
2170
Hisashi Hifumi4eedeb72009-06-10 15:28:55 -04002171 /*
2172 * one reference for us, and we leave it for the
2173 * caller
2174 */
Yan Zhenga512bbf2008-12-08 16:46:26 -05002175 bh = __getblk(device->bdev, bytenr / 4096,
2176 BTRFS_SUPER_INFO_SIZE);
2177 memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
2178
Hisashi Hifumi4eedeb72009-06-10 15:28:55 -04002179 /* one reference for submit_bh */
Yan Zhenga512bbf2008-12-08 16:46:26 -05002180 get_bh(bh);
Hisashi Hifumi4eedeb72009-06-10 15:28:55 -04002181
2182 set_buffer_uptodate(bh);
Yan Zhenga512bbf2008-12-08 16:46:26 -05002183 lock_buffer(bh);
2184 bh->b_end_io = btrfs_end_buffer_write_sync;
2185 }
2186
2187 if (i == last_barrier && do_barriers && device->barriers) {
2188 ret = submit_bh(WRITE_BARRIER, bh);
2189 if (ret == -EOPNOTSUPP) {
2190 printk("btrfs: disabling barriers on dev %s\n",
2191 device->name);
2192 set_buffer_uptodate(bh);
2193 device->barriers = 0;
Hisashi Hifumi4eedeb72009-06-10 15:28:55 -04002194 /* one reference for submit_bh */
Yan Zhenga512bbf2008-12-08 16:46:26 -05002195 get_bh(bh);
2196 lock_buffer(bh);
Chris Masonffbd5172009-04-20 15:50:09 -04002197 ret = submit_bh(WRITE_SYNC, bh);
Yan Zhenga512bbf2008-12-08 16:46:26 -05002198 }
2199 } else {
Chris Masonffbd5172009-04-20 15:50:09 -04002200 ret = submit_bh(WRITE_SYNC, bh);
Yan Zhenga512bbf2008-12-08 16:46:26 -05002201 }
2202
Hisashi Hifumi4eedeb72009-06-10 15:28:55 -04002203 if (ret)
Yan Zhenga512bbf2008-12-08 16:46:26 -05002204 errors++;
Yan Zhenga512bbf2008-12-08 16:46:26 -05002205 }
2206 return errors < i ? 0 : -1;
2207}
2208
2209int write_all_supers(struct btrfs_root *root, int max_mirrors)
Chris Masonf2984462008-04-10 16:19:33 -04002210{
Chris Masone5e9a522009-06-10 15:17:02 -04002211 struct list_head *head;
Chris Masonf2984462008-04-10 16:19:33 -04002212 struct btrfs_device *dev;
Chris Masona061fc82008-05-07 11:43:44 -04002213 struct btrfs_super_block *sb;
Chris Masonf2984462008-04-10 16:19:33 -04002214 struct btrfs_dev_item *dev_item;
Chris Masonf2984462008-04-10 16:19:33 -04002215 int ret;
2216 int do_barriers;
Chris Masona236aed2008-04-29 09:38:00 -04002217 int max_errors;
2218 int total_errors = 0;
Chris Masona061fc82008-05-07 11:43:44 -04002219 u64 flags;
Chris Masonf2984462008-04-10 16:19:33 -04002220
Chris Masona236aed2008-04-29 09:38:00 -04002221 max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1;
Chris Masonf2984462008-04-10 16:19:33 -04002222 do_barriers = !btrfs_test_opt(root, NOBARRIER);
2223
Chris Masona061fc82008-05-07 11:43:44 -04002224 sb = &root->fs_info->super_for_commit;
2225 dev_item = &sb->dev_item;
Chris Masone5e9a522009-06-10 15:17:02 -04002226
2227 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
2228 head = &root->fs_info->fs_devices->devices;
Qinghuang Fengc6e30872009-01-21 10:59:08 -05002229 list_for_each_entry(dev, head, dev_list) {
Chris Masondfe25022008-05-13 13:46:40 -04002230 if (!dev->bdev) {
2231 total_errors++;
2232 continue;
2233 }
Yan Zheng2b820322008-11-17 21:11:30 -05002234 if (!dev->in_fs_metadata || !dev->writeable)
Chris Masondfe25022008-05-13 13:46:40 -04002235 continue;
2236
Yan Zheng2b820322008-11-17 21:11:30 -05002237 btrfs_set_stack_device_generation(dev_item, 0);
Chris Masona061fc82008-05-07 11:43:44 -04002238 btrfs_set_stack_device_type(dev_item, dev->type);
2239 btrfs_set_stack_device_id(dev_item, dev->devid);
2240 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
2241 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
2242 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
2243 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
2244 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
2245 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
Yan Zheng2b820322008-11-17 21:11:30 -05002246 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
Yan Zhenga512bbf2008-12-08 16:46:26 -05002247
Chris Masona061fc82008-05-07 11:43:44 -04002248 flags = btrfs_super_flags(sb);
2249 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
Chris Masonf2984462008-04-10 16:19:33 -04002250
Yan Zhenga512bbf2008-12-08 16:46:26 -05002251 ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors);
Chris Masona236aed2008-04-29 09:38:00 -04002252 if (ret)
2253 total_errors++;
Chris Masonf2984462008-04-10 16:19:33 -04002254 }
Chris Masona236aed2008-04-29 09:38:00 -04002255 if (total_errors > max_errors) {
Chris Masond3977122009-01-05 21:25:51 -05002256 printk(KERN_ERR "btrfs: %d errors while writing supers\n",
2257 total_errors);
Chris Masona236aed2008-04-29 09:38:00 -04002258 BUG();
2259 }
Chris Masonf2984462008-04-10 16:19:33 -04002260
Yan Zhenga512bbf2008-12-08 16:46:26 -05002261 total_errors = 0;
Qinghuang Fengc6e30872009-01-21 10:59:08 -05002262 list_for_each_entry(dev, head, dev_list) {
Chris Masondfe25022008-05-13 13:46:40 -04002263 if (!dev->bdev)
2264 continue;
Yan Zheng2b820322008-11-17 21:11:30 -05002265 if (!dev->in_fs_metadata || !dev->writeable)
Chris Masondfe25022008-05-13 13:46:40 -04002266 continue;
2267
Yan Zhenga512bbf2008-12-08 16:46:26 -05002268 ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors);
2269 if (ret)
2270 total_errors++;
Chris Masonf2984462008-04-10 16:19:33 -04002271 }
Chris Masone5e9a522009-06-10 15:17:02 -04002272 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
Chris Masona236aed2008-04-29 09:38:00 -04002273 if (total_errors > max_errors) {
Chris Masond3977122009-01-05 21:25:51 -05002274 printk(KERN_ERR "btrfs: %d errors while writing supers\n",
2275 total_errors);
Chris Masona236aed2008-04-29 09:38:00 -04002276 BUG();
2277 }
Chris Masonf2984462008-04-10 16:19:33 -04002278 return 0;
2279}
2280
Yan Zhenga512bbf2008-12-08 16:46:26 -05002281int write_ctree_super(struct btrfs_trans_handle *trans,
2282 struct btrfs_root *root, int max_mirrors)
Chris Masoncfaa7292007-02-21 17:04:57 -05002283{
Chris Masone66f7092007-04-20 13:16:02 -04002284 int ret;
Chris Mason2c90e5d2007-04-02 10:50:19 -04002285
Yan Zhenga512bbf2008-12-08 16:46:26 -05002286 ret = write_all_supers(root, max_mirrors);
Chris Mason5f39d392007-10-15 16:14:19 -04002287 return ret;
Chris Masoncfaa7292007-02-21 17:04:57 -05002288}
2289
Chris Mason5eda7b52007-06-22 14:16:25 -04002290int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
Chris Mason2619ba12007-04-10 16:58:11 -04002291{
Yan, Zheng4df27c4d2009-09-21 15:56:00 -04002292 spin_lock(&fs_info->fs_roots_radix_lock);
Chris Mason2619ba12007-04-10 16:58:11 -04002293 radix_tree_delete(&fs_info->fs_roots_radix,
2294 (unsigned long)root->root_key.objectid);
Yan, Zheng4df27c4d2009-09-21 15:56:00 -04002295 spin_unlock(&fs_info->fs_roots_radix_lock);
Yan, Zheng76dda932009-09-21 16:00:26 -04002296
2297 if (btrfs_root_refs(&root->root_item) == 0)
2298 synchronize_srcu(&fs_info->subvol_srcu);
2299
Yan, Zheng4df27c4d2009-09-21 15:56:00 -04002300 free_fs_root(root);
2301 return 0;
2302}
2303
2304static void free_fs_root(struct btrfs_root *root)
2305{
2306 WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
Chris Mason3394e162008-11-17 20:42:26 -05002307 if (root->anon_super.s_dev) {
2308 down_write(&root->anon_super.s_umount);
2309 kill_anon_super(&root->anon_super);
2310 }
Yan, Zheng4df27c4d2009-09-21 15:56:00 -04002311 free_extent_buffer(root->node);
2312 free_extent_buffer(root->commit_root);
Chris Masond3977122009-01-05 21:25:51 -05002313 kfree(root->name);
Chris Mason2619ba12007-04-10 16:58:11 -04002314 kfree(root);
Chris Mason2619ba12007-04-10 16:58:11 -04002315}
2316
Chris Mason35b7e472007-05-02 15:53:43 -04002317static int del_fs_roots(struct btrfs_fs_info *fs_info)
Chris Mason0f7d52f2007-04-09 10:42:37 -04002318{
2319 int ret;
2320 struct btrfs_root *gang[8];
2321 int i;
2322
Yan, Zheng76dda932009-09-21 16:00:26 -04002323 while (!list_empty(&fs_info->dead_roots)) {
2324 gang[0] = list_entry(fs_info->dead_roots.next,
2325 struct btrfs_root, root_list);
2326 list_del(&gang[0]->root_list);
2327
2328 if (gang[0]->in_radix) {
2329 btrfs_free_fs_root(fs_info, gang[0]);
2330 } else {
2331 free_extent_buffer(gang[0]->node);
2332 free_extent_buffer(gang[0]->commit_root);
2333 kfree(gang[0]);
2334 }
2335 }
2336
Chris Masond3977122009-01-05 21:25:51 -05002337 while (1) {
Chris Mason0f7d52f2007-04-09 10:42:37 -04002338 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
2339 (void **)gang, 0,
2340 ARRAY_SIZE(gang));
2341 if (!ret)
2342 break;
Chris Mason2619ba12007-04-10 16:58:11 -04002343 for (i = 0; i < ret; i++)
Chris Mason5eda7b52007-06-22 14:16:25 -04002344 btrfs_free_fs_root(fs_info, gang[i]);
Chris Mason0f7d52f2007-04-09 10:42:37 -04002345 }
2346 return 0;
2347}
Chris Masonb4100d62007-04-12 12:14:00 -04002348
Yan Zhengc146afa2008-11-12 14:34:12 -05002349int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
2350{
2351 u64 root_objectid = 0;
2352 struct btrfs_root *gang[8];
2353 int i;
2354 int ret;
2355
2356 while (1) {
2357 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
2358 (void **)gang, root_objectid,
2359 ARRAY_SIZE(gang));
2360 if (!ret)
2361 break;
Yan Zheng5d4f98a2009-06-10 10:45:14 -04002362
2363 root_objectid = gang[ret - 1]->root_key.objectid + 1;
Yan Zhengc146afa2008-11-12 14:34:12 -05002364 for (i = 0; i < ret; i++) {
2365 root_objectid = gang[i]->root_key.objectid;
Yan Zhengc146afa2008-11-12 14:34:12 -05002366 btrfs_orphan_cleanup(gang[i]);
2367 }
2368 root_objectid++;
2369 }
2370 return 0;
2371}
2372
2373int btrfs_commit_super(struct btrfs_root *root)
2374{
2375 struct btrfs_trans_handle *trans;
2376 int ret;
2377
2378 mutex_lock(&root->fs_info->cleaner_mutex);
2379 btrfs_clean_old_snapshots(root);
2380 mutex_unlock(&root->fs_info->cleaner_mutex);
2381 trans = btrfs_start_transaction(root, 1);
2382 ret = btrfs_commit_transaction(trans, root);
2383 BUG_ON(ret);
2384 /* run commit again to drop the original snapshot */
2385 trans = btrfs_start_transaction(root, 1);
2386 btrfs_commit_transaction(trans, root);
2387 ret = btrfs_write_and_wait_transaction(NULL, root);
2388 BUG_ON(ret);
2389
Yan Zhenga512bbf2008-12-08 16:46:26 -05002390 ret = write_ctree_super(NULL, root, 0);
Yan Zhengc146afa2008-11-12 14:34:12 -05002391 return ret;
2392}
2393
Chris Masone20d96d2007-03-22 12:13:20 -04002394int close_ctree(struct btrfs_root *root)
Chris Masoneb60cea2007-02-02 09:18:22 -05002395{
Chris Mason0f7d52f2007-04-09 10:42:37 -04002396 struct btrfs_fs_info *fs_info = root->fs_info;
Yan Zhengc146afa2008-11-12 14:34:12 -05002397 int ret;
Chris Masone089f052007-03-16 16:20:31 -04002398
Chris Masonfacda1e2007-06-08 18:11:48 -04002399 fs_info->closing = 1;
Chris Masona2135012008-06-25 16:01:30 -04002400 smp_mb();
2401
Chris Masona74a4b92008-06-25 16:01:31 -04002402 kthread_stop(root->fs_info->transaction_kthread);
2403 kthread_stop(root->fs_info->cleaner_kthread);
2404
Yan Zhengc146afa2008-11-12 14:34:12 -05002405 if (!(fs_info->sb->s_flags & MS_RDONLY)) {
2406 ret = btrfs_commit_super(root);
Chris Masond3977122009-01-05 21:25:51 -05002407 if (ret)
2408 printk(KERN_ERR "btrfs: commit super ret %d\n", ret);
Yan Zhengc146afa2008-11-12 14:34:12 -05002409 }
Chris Masoned2ff2c2007-03-01 18:59:40 -05002410
Yan Zhengf25784b2009-07-28 08:41:57 -04002411 fs_info->closing = 2;
2412 smp_mb();
2413
Chris Masonb0c68f82008-01-31 11:05:37 -05002414 if (fs_info->delalloc_bytes) {
Chris Masond3977122009-01-05 21:25:51 -05002415 printk(KERN_INFO "btrfs: at unmount delalloc count %llu\n",
Joel Becker21380932009-04-21 12:38:29 -07002416 (unsigned long long)fs_info->delalloc_bytes);
Chris Masonb0c68f82008-01-31 11:05:37 -05002417 }
Yan Zheng31153d82008-07-28 15:32:19 -04002418 if (fs_info->total_ref_cache_size) {
Chris Masond3977122009-01-05 21:25:51 -05002419 printk(KERN_INFO "btrfs: at umount reference cache size %llu\n",
2420 (unsigned long long)fs_info->total_ref_cache_size);
Yan Zheng31153d82008-07-28 15:32:19 -04002421 }
Yanbcc63ab2008-07-30 16:29:20 -04002422
Yan Zheng5d4f98a2009-06-10 10:45:14 -04002423 free_extent_buffer(fs_info->extent_root->node);
2424 free_extent_buffer(fs_info->extent_root->commit_root);
2425 free_extent_buffer(fs_info->tree_root->node);
2426 free_extent_buffer(fs_info->tree_root->commit_root);
2427 free_extent_buffer(root->fs_info->chunk_root->node);
2428 free_extent_buffer(root->fs_info->chunk_root->commit_root);
2429 free_extent_buffer(root->fs_info->dev_root->node);
2430 free_extent_buffer(root->fs_info->dev_root->commit_root);
2431 free_extent_buffer(root->fs_info->csum_root->node);
2432 free_extent_buffer(root->fs_info->csum_root->commit_root);
Chris Masond20f7042008-12-08 16:58:54 -05002433
Chris Mason9078a3e2007-04-26 16:46:15 -04002434 btrfs_free_block_groups(root->fs_info);
Yan Zhengc146afa2008-11-12 14:34:12 -05002435
Chris Mason0f7d52f2007-04-09 10:42:37 -04002436 del_fs_roots(fs_info);
Chris Masond10c5f32007-12-17 20:14:04 -05002437
Yan Zhengc146afa2008-11-12 14:34:12 -05002438 iput(fs_info->btree_inode);
Chris Mason9ad6b7b2008-04-18 16:11:30 -04002439
Chris Mason247e7432008-07-17 12:53:51 -04002440 btrfs_stop_workers(&fs_info->fixup_workers);
Chris Mason771ed682008-11-06 22:02:51 -05002441 btrfs_stop_workers(&fs_info->delalloc_workers);
Chris Mason8b712842008-06-11 16:50:36 -04002442 btrfs_stop_workers(&fs_info->workers);
2443 btrfs_stop_workers(&fs_info->endio_workers);
Chris Masond20f7042008-12-08 16:58:54 -05002444 btrfs_stop_workers(&fs_info->endio_meta_workers);
Chris Masoncad321a2008-12-17 14:51:42 -05002445 btrfs_stop_workers(&fs_info->endio_meta_write_workers);
Chris Masone6dcd2d2008-07-17 12:53:50 -04002446 btrfs_stop_workers(&fs_info->endio_write_workers);
Chris Mason1cc127b2008-06-12 14:46:17 -04002447 btrfs_stop_workers(&fs_info->submit_workers);
Chris Masond6bfde82008-04-30 13:59:35 -04002448
Chris Masondfe25022008-05-13 13:46:40 -04002449 btrfs_close_devices(fs_info->fs_devices);
Chris Mason0b86a832008-03-24 15:01:56 -04002450 btrfs_mapping_tree_free(&fs_info->mapping_tree);
Chris Masonb248a412008-04-14 09:48:18 -04002451
Chris Mason04160082008-03-26 10:28:07 -04002452 bdi_destroy(&fs_info->bdi);
Yan, Zheng76dda932009-09-21 16:00:26 -04002453 cleanup_srcu_struct(&fs_info->subvol_srcu);
Chris Mason0b86a832008-03-24 15:01:56 -04002454
Chris Mason0f7d52f2007-04-09 10:42:37 -04002455 kfree(fs_info->extent_root);
Chris Mason0f7d52f2007-04-09 10:42:37 -04002456 kfree(fs_info->tree_root);
Chris Mason0b86a832008-03-24 15:01:56 -04002457 kfree(fs_info->chunk_root);
2458 kfree(fs_info->dev_root);
Chris Masond20f7042008-12-08 16:58:54 -05002459 kfree(fs_info->csum_root);
Chris Masoneb60cea2007-02-02 09:18:22 -05002460 return 0;
2461}
2462
Chris Mason1259ab72008-05-12 13:39:03 -04002463int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
Chris Masonccd467d2007-06-28 15:57:36 -04002464{
Chris Mason1259ab72008-05-12 13:39:03 -04002465 int ret;
Chris Mason810191f2007-10-15 16:18:55 -04002466 struct inode *btree_inode = buf->first_page->mapping->host;
Chris Mason1259ab72008-05-12 13:39:03 -04002467
2468 ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf);
2469 if (!ret)
2470 return ret;
2471
2472 ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf,
2473 parent_transid);
2474 return !ret;
Chris Mason5f39d392007-10-15 16:14:19 -04002475}
Chris Mason6702ed42007-08-07 16:15:09 -04002476
Chris Mason5f39d392007-10-15 16:14:19 -04002477int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
2478{
Chris Mason810191f2007-10-15 16:18:55 -04002479 struct inode *btree_inode = buf->first_page->mapping->host;
Chris Masond1310b22008-01-24 16:13:08 -05002480 return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree,
Chris Mason5f39d392007-10-15 16:14:19 -04002481 buf);
2482}
2483
2484void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
2485{
Chris Mason810191f2007-10-15 16:18:55 -04002486 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
Chris Mason5f39d392007-10-15 16:14:19 -04002487 u64 transid = btrfs_header_generation(buf);
2488 struct inode *btree_inode = root->fs_info->btree_inode;
Chris Masonb9473432009-03-13 11:00:37 -04002489 int was_dirty;
Chris Masonb4ce94d2009-02-04 09:25:08 -05002490
Chris Masonb9447ef2009-03-09 11:45:38 -04002491 btrfs_assert_tree_locked(buf);
Chris Masonccd467d2007-06-28 15:57:36 -04002492 if (transid != root->fs_info->generation) {
Chris Masond3977122009-01-05 21:25:51 -05002493 printk(KERN_CRIT "btrfs transid mismatch buffer %llu, "
2494 "found %llu running %llu\n",
Chris Masondb945352007-10-15 16:15:53 -04002495 (unsigned long long)buf->start,
Chris Masond3977122009-01-05 21:25:51 -05002496 (unsigned long long)transid,
2497 (unsigned long long)root->fs_info->generation);
Chris Masonccd467d2007-06-28 15:57:36 -04002498 WARN_ON(1);
2499 }
Chris Masonb9473432009-03-13 11:00:37 -04002500 was_dirty = set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
2501 buf);
2502 if (!was_dirty) {
2503 spin_lock(&root->fs_info->delalloc_lock);
2504 root->fs_info->dirty_metadata_bytes += buf->len;
2505 spin_unlock(&root->fs_info->delalloc_lock);
2506 }
Chris Masoneb60cea2007-02-02 09:18:22 -05002507}
2508
Chris Masond3c2fdc2007-09-17 10:58:06 -04002509void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
Chris Mason35b7e472007-05-02 15:53:43 -04002510{
Chris Mason188de642008-05-09 11:52:25 -04002511 /*
2512 * looks as though older kernels can get into trouble with
2513 * this code, they end up stuck in balance_dirty_pages forever
2514 */
Chris Masond6bfde82008-04-30 13:59:35 -04002515 u64 num_dirty;
Chris Mason771ed682008-11-06 22:02:51 -05002516 unsigned long thresh = 32 * 1024 * 1024;
Chris Masond6bfde82008-04-30 13:59:35 -04002517
Jens Axboe6933c022009-03-17 09:36:37 +01002518 if (current->flags & PF_MEMALLOC)
Chris Masond6bfde82008-04-30 13:59:35 -04002519 return;
2520
Chris Mason585ad2c2009-05-18 10:41:58 -04002521 num_dirty = root->fs_info->dirty_metadata_bytes;
2522
Chris Masond6bfde82008-04-30 13:59:35 -04002523 if (num_dirty > thresh) {
2524 balance_dirty_pages_ratelimited_nr(
Chris Masond7fc6402008-02-18 12:12:38 -05002525 root->fs_info->btree_inode->i_mapping, 1);
Chris Masond6bfde82008-04-30 13:59:35 -04002526 }
Chris Mason188de642008-05-09 11:52:25 -04002527 return;
Chris Mason35b7e472007-05-02 15:53:43 -04002528}
Chris Mason6b800532007-10-15 16:17:34 -04002529
Chris Masonca7a79a2008-05-12 12:59:19 -04002530int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid)
Chris Mason6b800532007-10-15 16:17:34 -04002531{
Chris Mason810191f2007-10-15 16:18:55 -04002532 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
Chris Masonce9adaa2008-04-09 16:28:12 -04002533 int ret;
Chris Masonca7a79a2008-05-12 12:59:19 -04002534 ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
Chris Masond3977122009-01-05 21:25:51 -05002535 if (ret == 0)
Chris Masonb4ce94d2009-02-04 09:25:08 -05002536 set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags);
Chris Masonce9adaa2008-04-09 16:28:12 -04002537 return ret;
Chris Mason6b800532007-10-15 16:17:34 -04002538}
Chris Mason0da54682007-11-07 21:08:01 -05002539
Chris Mason4bef0842008-09-08 11:18:08 -04002540int btree_lock_page_hook(struct page *page)
2541{
2542 struct inode *inode = page->mapping->host;
Chris Masonb9473432009-03-13 11:00:37 -04002543 struct btrfs_root *root = BTRFS_I(inode)->root;
Chris Mason4bef0842008-09-08 11:18:08 -04002544 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2545 struct extent_buffer *eb;
2546 unsigned long len;
2547 u64 bytenr = page_offset(page);
2548
2549 if (page->private == EXTENT_PAGE_PRIVATE)
2550 goto out;
2551
2552 len = page->private >> 2;
2553 eb = find_extent_buffer(io_tree, bytenr, len, GFP_NOFS);
2554 if (!eb)
2555 goto out;
2556
2557 btrfs_tree_lock(eb);
Chris Mason4bef0842008-09-08 11:18:08 -04002558 btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
Chris Masonb9473432009-03-13 11:00:37 -04002559
2560 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) {
2561 spin_lock(&root->fs_info->delalloc_lock);
2562 if (root->fs_info->dirty_metadata_bytes >= eb->len)
2563 root->fs_info->dirty_metadata_bytes -= eb->len;
2564 else
2565 WARN_ON(1);
2566 spin_unlock(&root->fs_info->delalloc_lock);
2567 }
2568
Chris Mason4bef0842008-09-08 11:18:08 -04002569 btrfs_tree_unlock(eb);
2570 free_extent_buffer(eb);
2571out:
2572 lock_page(page);
2573 return 0;
2574}
2575
Chris Masond1310b22008-01-24 16:13:08 -05002576static struct extent_io_ops btree_extent_io_ops = {
Chris Mason4bef0842008-09-08 11:18:08 -04002577 .write_cache_pages_lock_hook = btree_lock_page_hook,
Chris Masonce9adaa2008-04-09 16:28:12 -04002578 .readpage_end_io_hook = btree_readpage_end_io_hook,
Chris Mason0b86a832008-03-24 15:01:56 -04002579 .submit_bio_hook = btree_submit_bio_hook,
Chris Mason239b14b2008-03-24 15:02:07 -04002580 /* note we're sharing with inode.c for the merge bio hook */
2581 .merge_bio_hook = btrfs_merge_bio_hook,
Chris Mason0da54682007-11-07 21:08:01 -05002582};