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Arne Jansena2de7332011-03-08 14:14:00 +01001/*
Stefan Behrensb6bfebc2012-11-02 16:44:58 +01002 * Copyright (C) 2011, 2012 STRATO. All rights reserved.
Arne Jansena2de7332011-03-08 14:14:00 +01003 *
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
Arne Jansena2de7332011-03-08 14:14:00 +010019#include <linux/blkdev.h>
Jan Schmidt558540c2011-06-13 19:59:12 +020020#include <linux/ratelimit.h>
Arne Jansena2de7332011-03-08 14:14:00 +010021#include "ctree.h"
22#include "volumes.h"
23#include "disk-io.h"
24#include "ordered-data.h"
Jan Schmidt0ef8e452011-06-13 20:04:15 +020025#include "transaction.h"
Jan Schmidt558540c2011-06-13 19:59:12 +020026#include "backref.h"
Jan Schmidt5da6fcb2011-08-04 18:11:04 +020027#include "extent_io.h"
Stefan Behrensff023aa2012-11-06 11:43:11 +010028#include "dev-replace.h"
Stefan Behrens21adbd52011-11-09 13:44:05 +010029#include "check-integrity.h"
Josef Bacik606686e2012-06-04 14:03:51 -040030#include "rcu-string.h"
David Woodhouse53b381b2013-01-29 18:40:14 -050031#include "raid56.h"
Arne Jansena2de7332011-03-08 14:14:00 +010032
33/*
34 * This is only the first step towards a full-features scrub. It reads all
35 * extent and super block and verifies the checksums. In case a bad checksum
36 * is found or the extent cannot be read, good data will be written back if
37 * any can be found.
38 *
39 * Future enhancements:
Arne Jansena2de7332011-03-08 14:14:00 +010040 * - In case an unrepairable extent is encountered, track which files are
41 * affected and report them
Arne Jansena2de7332011-03-08 14:14:00 +010042 * - track and record media errors, throw out bad devices
Arne Jansena2de7332011-03-08 14:14:00 +010043 * - add a mode to also read unallocated space
Arne Jansena2de7332011-03-08 14:14:00 +010044 */
45
Stefan Behrensb5d67f62012-03-27 14:21:27 -040046struct scrub_block;
Stefan Behrensd9d181c2012-11-02 09:58:09 +010047struct scrub_ctx;
Arne Jansena2de7332011-03-08 14:14:00 +010048
Stefan Behrensff023aa2012-11-06 11:43:11 +010049/*
50 * the following three values only influence the performance.
51 * The last one configures the number of parallel and outstanding I/O
52 * operations. The first two values configure an upper limit for the number
53 * of (dynamically allocated) pages that are added to a bio.
54 */
55#define SCRUB_PAGES_PER_RD_BIO 32 /* 128k per bio */
56#define SCRUB_PAGES_PER_WR_BIO 32 /* 128k per bio */
57#define SCRUB_BIOS_PER_SCTX 64 /* 8MB per device in flight */
Stefan Behrens7a9e9982012-11-02 14:58:04 +010058
59/*
60 * the following value times PAGE_SIZE needs to be large enough to match the
61 * largest node/leaf/sector size that shall be supported.
62 * Values larger than BTRFS_STRIPE_LEN are not supported.
63 */
Stefan Behrensb5d67f62012-03-27 14:21:27 -040064#define SCRUB_MAX_PAGES_PER_BLOCK 16 /* 64k per node/leaf/sector */
Arne Jansena2de7332011-03-08 14:14:00 +010065
Miao Xieaf8e2d12014-10-23 14:42:50 +080066struct scrub_recover {
67 atomic_t refs;
68 struct btrfs_bio *bbio;
Miao Xieaf8e2d12014-10-23 14:42:50 +080069 u64 map_length;
70};
71
Arne Jansena2de7332011-03-08 14:14:00 +010072struct scrub_page {
Stefan Behrensb5d67f62012-03-27 14:21:27 -040073 struct scrub_block *sblock;
74 struct page *page;
Stefan Behrens442a4f62012-05-25 16:06:08 +020075 struct btrfs_device *dev;
Miao Xie5a6ac9e2014-11-06 17:20:58 +080076 struct list_head list;
Arne Jansena2de7332011-03-08 14:14:00 +010077 u64 flags; /* extent flags */
78 u64 generation;
Stefan Behrensb5d67f62012-03-27 14:21:27 -040079 u64 logical;
80 u64 physical;
Stefan Behrensff023aa2012-11-06 11:43:11 +010081 u64 physical_for_dev_replace;
Zhao Lei57019342015-01-20 15:11:45 +080082 atomic_t refs;
Stefan Behrensb5d67f62012-03-27 14:21:27 -040083 struct {
84 unsigned int mirror_num:8;
85 unsigned int have_csum:1;
86 unsigned int io_error:1;
87 };
Arne Jansena2de7332011-03-08 14:14:00 +010088 u8 csum[BTRFS_CSUM_SIZE];
Miao Xieaf8e2d12014-10-23 14:42:50 +080089
90 struct scrub_recover *recover;
Arne Jansena2de7332011-03-08 14:14:00 +010091};
92
93struct scrub_bio {
94 int index;
Stefan Behrensd9d181c2012-11-02 09:58:09 +010095 struct scrub_ctx *sctx;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +010096 struct btrfs_device *dev;
Arne Jansena2de7332011-03-08 14:14:00 +010097 struct bio *bio;
98 int err;
99 u64 logical;
100 u64 physical;
Stefan Behrensff023aa2012-11-06 11:43:11 +0100101#if SCRUB_PAGES_PER_WR_BIO >= SCRUB_PAGES_PER_RD_BIO
102 struct scrub_page *pagev[SCRUB_PAGES_PER_WR_BIO];
103#else
104 struct scrub_page *pagev[SCRUB_PAGES_PER_RD_BIO];
105#endif
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400106 int page_count;
Arne Jansena2de7332011-03-08 14:14:00 +0100107 int next_free;
108 struct btrfs_work work;
109};
110
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400111struct scrub_block {
Stefan Behrens7a9e9982012-11-02 14:58:04 +0100112 struct scrub_page *pagev[SCRUB_MAX_PAGES_PER_BLOCK];
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400113 int page_count;
114 atomic_t outstanding_pages;
Zhao Lei57019342015-01-20 15:11:45 +0800115 atomic_t refs; /* free mem on transition to zero */
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100116 struct scrub_ctx *sctx;
Miao Xie5a6ac9e2014-11-06 17:20:58 +0800117 struct scrub_parity *sparity;
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400118 struct {
119 unsigned int header_error:1;
120 unsigned int checksum_error:1;
121 unsigned int no_io_error_seen:1;
Stefan Behrens442a4f62012-05-25 16:06:08 +0200122 unsigned int generation_error:1; /* also sets header_error */
Miao Xie5a6ac9e2014-11-06 17:20:58 +0800123
124 /* The following is for the data used to check parity */
125 /* It is for the data with checksum */
126 unsigned int data_corrected:1;
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400127 };
Omar Sandoval73ff61d2015-06-19 11:52:51 -0700128 struct btrfs_work work;
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400129};
130
Miao Xie5a6ac9e2014-11-06 17:20:58 +0800131/* Used for the chunks with parity stripe such RAID5/6 */
132struct scrub_parity {
133 struct scrub_ctx *sctx;
134
135 struct btrfs_device *scrub_dev;
136
137 u64 logic_start;
138
139 u64 logic_end;
140
141 int nsectors;
142
143 int stripe_len;
144
Zhao Lei57019342015-01-20 15:11:45 +0800145 atomic_t refs;
Miao Xie5a6ac9e2014-11-06 17:20:58 +0800146
147 struct list_head spages;
148
149 /* Work of parity check and repair */
150 struct btrfs_work work;
151
152 /* Mark the parity blocks which have data */
153 unsigned long *dbitmap;
154
155 /*
156 * Mark the parity blocks which have data, but errors happen when
157 * read data or check data
158 */
159 unsigned long *ebitmap;
160
161 unsigned long bitmap[0];
162};
163
Stefan Behrensff023aa2012-11-06 11:43:11 +0100164struct scrub_wr_ctx {
165 struct scrub_bio *wr_curr_bio;
166 struct btrfs_device *tgtdev;
167 int pages_per_wr_bio; /* <= SCRUB_PAGES_PER_WR_BIO */
168 atomic_t flush_all_writes;
169 struct mutex wr_lock;
170};
171
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100172struct scrub_ctx {
Stefan Behrensff023aa2012-11-06 11:43:11 +0100173 struct scrub_bio *bios[SCRUB_BIOS_PER_SCTX];
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100174 struct btrfs_root *dev_root;
Arne Jansena2de7332011-03-08 14:14:00 +0100175 int first_free;
176 int curr;
Stefan Behrensb6bfebc2012-11-02 16:44:58 +0100177 atomic_t bios_in_flight;
178 atomic_t workers_pending;
Arne Jansena2de7332011-03-08 14:14:00 +0100179 spinlock_t list_lock;
180 wait_queue_head_t list_wait;
181 u16 csum_size;
182 struct list_head csum_list;
183 atomic_t cancel_req;
Arne Jansen86287642011-03-23 16:34:19 +0100184 int readonly;
Stefan Behrensff023aa2012-11-06 11:43:11 +0100185 int pages_per_rd_bio;
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400186 u32 sectorsize;
187 u32 nodesize;
Stefan Behrens63a212a2012-11-05 18:29:28 +0100188
189 int is_dev_replace;
Stefan Behrensff023aa2012-11-06 11:43:11 +0100190 struct scrub_wr_ctx wr_ctx;
Stefan Behrens63a212a2012-11-05 18:29:28 +0100191
Arne Jansena2de7332011-03-08 14:14:00 +0100192 /*
193 * statistics
194 */
195 struct btrfs_scrub_progress stat;
196 spinlock_t stat_lock;
Filipe Mananaf55985f2015-02-09 21:14:24 +0000197
198 /*
199 * Use a ref counter to avoid use-after-free issues. Scrub workers
200 * decrement bios_in_flight and workers_pending and then do a wakeup
201 * on the list_wait wait queue. We must ensure the main scrub task
202 * doesn't free the scrub context before or while the workers are
203 * doing the wakeup() call.
204 */
205 atomic_t refs;
Arne Jansena2de7332011-03-08 14:14:00 +0100206};
207
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200208struct scrub_fixup_nodatasum {
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100209 struct scrub_ctx *sctx;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100210 struct btrfs_device *dev;
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200211 u64 logical;
212 struct btrfs_root *root;
213 struct btrfs_work work;
214 int mirror_num;
215};
216
Josef Bacik652f25a2013-09-12 16:58:28 -0400217struct scrub_nocow_inode {
218 u64 inum;
219 u64 offset;
220 u64 root;
221 struct list_head list;
222};
223
Stefan Behrensff023aa2012-11-06 11:43:11 +0100224struct scrub_copy_nocow_ctx {
225 struct scrub_ctx *sctx;
226 u64 logical;
227 u64 len;
228 int mirror_num;
229 u64 physical_for_dev_replace;
Josef Bacik652f25a2013-09-12 16:58:28 -0400230 struct list_head inodes;
Stefan Behrensff023aa2012-11-06 11:43:11 +0100231 struct btrfs_work work;
232};
233
Jan Schmidt558540c2011-06-13 19:59:12 +0200234struct scrub_warning {
235 struct btrfs_path *path;
236 u64 extent_item_size;
Jan Schmidt558540c2011-06-13 19:59:12 +0200237 const char *errstr;
238 sector_t sector;
239 u64 logical;
240 struct btrfs_device *dev;
Jan Schmidt558540c2011-06-13 19:59:12 +0200241};
242
Stefan Behrensb6bfebc2012-11-02 16:44:58 +0100243static void scrub_pending_bio_inc(struct scrub_ctx *sctx);
244static void scrub_pending_bio_dec(struct scrub_ctx *sctx);
245static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx);
246static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400247static int scrub_handle_errored_block(struct scrub_block *sblock_to_check);
Zhao Leibe50a8d2015-01-20 15:11:42 +0800248static int scrub_setup_recheck_block(struct scrub_block *original_sblock,
Stefan Behrensff023aa2012-11-06 11:43:11 +0100249 struct scrub_block *sblocks_for_recheck);
Stefan Behrens34f5c8e2012-11-02 16:16:26 +0100250static void scrub_recheck_block(struct btrfs_fs_info *fs_info,
Zhao Leiaffe4a52015-08-24 21:32:06 +0800251 struct scrub_block *sblock,
252 int retry_failed_mirror);
Zhao Leiba7cf982015-08-24 21:18:02 +0800253static void scrub_recheck_block_checksum(struct scrub_block *sblock);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400254static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad,
Zhao Lei114ab502015-01-20 15:11:36 +0800255 struct scrub_block *sblock_good);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400256static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad,
257 struct scrub_block *sblock_good,
258 int page_num, int force_write);
Stefan Behrensff023aa2012-11-06 11:43:11 +0100259static void scrub_write_block_to_dev_replace(struct scrub_block *sblock);
260static int scrub_write_page_to_dev_replace(struct scrub_block *sblock,
261 int page_num);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400262static int scrub_checksum_data(struct scrub_block *sblock);
263static int scrub_checksum_tree_block(struct scrub_block *sblock);
264static int scrub_checksum_super(struct scrub_block *sblock);
265static void scrub_block_get(struct scrub_block *sblock);
266static void scrub_block_put(struct scrub_block *sblock);
Stefan Behrens7a9e9982012-11-02 14:58:04 +0100267static void scrub_page_get(struct scrub_page *spage);
268static void scrub_page_put(struct scrub_page *spage);
Miao Xie5a6ac9e2014-11-06 17:20:58 +0800269static void scrub_parity_get(struct scrub_parity *sparity);
270static void scrub_parity_put(struct scrub_parity *sparity);
Stefan Behrensff023aa2012-11-06 11:43:11 +0100271static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx,
272 struct scrub_page *spage);
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100273static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100274 u64 physical, struct btrfs_device *dev, u64 flags,
Stefan Behrensff023aa2012-11-06 11:43:11 +0100275 u64 gen, int mirror_num, u8 *csum, int force,
276 u64 physical_for_dev_replace);
Christoph Hellwig4246a0b2015-07-20 15:29:37 +0200277static void scrub_bio_end_io(struct bio *bio);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400278static void scrub_bio_end_io_worker(struct btrfs_work *work);
279static void scrub_block_complete(struct scrub_block *sblock);
Stefan Behrensff023aa2012-11-06 11:43:11 +0100280static void scrub_remap_extent(struct btrfs_fs_info *fs_info,
281 u64 extent_logical, u64 extent_len,
282 u64 *extent_physical,
283 struct btrfs_device **extent_dev,
284 int *extent_mirror_num);
285static int scrub_setup_wr_ctx(struct scrub_ctx *sctx,
286 struct scrub_wr_ctx *wr_ctx,
287 struct btrfs_fs_info *fs_info,
288 struct btrfs_device *dev,
289 int is_dev_replace);
290static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx);
291static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx,
292 struct scrub_page *spage);
293static void scrub_wr_submit(struct scrub_ctx *sctx);
Christoph Hellwig4246a0b2015-07-20 15:29:37 +0200294static void scrub_wr_bio_end_io(struct bio *bio);
Stefan Behrensff023aa2012-11-06 11:43:11 +0100295static void scrub_wr_bio_end_io_worker(struct btrfs_work *work);
296static int write_page_nocow(struct scrub_ctx *sctx,
297 u64 physical_for_dev_replace, struct page *page);
298static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root,
Josef Bacik652f25a2013-09-12 16:58:28 -0400299 struct scrub_copy_nocow_ctx *ctx);
Stefan Behrensff023aa2012-11-06 11:43:11 +0100300static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
301 int mirror_num, u64 physical_for_dev_replace);
302static void copy_nocow_pages_worker(struct btrfs_work *work);
Wang Shilongcb7ab022013-12-04 21:16:53 +0800303static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info);
Wang Shilong3cb09292013-12-04 21:15:19 +0800304static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info);
Filipe Mananaf55985f2015-02-09 21:14:24 +0000305static void scrub_put_ctx(struct scrub_ctx *sctx);
Stefan Behrens1623ede2012-03-27 14:21:26 -0400306
307
Stefan Behrensb6bfebc2012-11-02 16:44:58 +0100308static void scrub_pending_bio_inc(struct scrub_ctx *sctx)
309{
Filipe Mananaf55985f2015-02-09 21:14:24 +0000310 atomic_inc(&sctx->refs);
Stefan Behrensb6bfebc2012-11-02 16:44:58 +0100311 atomic_inc(&sctx->bios_in_flight);
312}
313
314static void scrub_pending_bio_dec(struct scrub_ctx *sctx)
315{
316 atomic_dec(&sctx->bios_in_flight);
317 wake_up(&sctx->list_wait);
Filipe Mananaf55985f2015-02-09 21:14:24 +0000318 scrub_put_ctx(sctx);
Stefan Behrensb6bfebc2012-11-02 16:44:58 +0100319}
320
Wang Shilongcb7ab022013-12-04 21:16:53 +0800321static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info)
Wang Shilong3cb09292013-12-04 21:15:19 +0800322{
323 while (atomic_read(&fs_info->scrub_pause_req)) {
324 mutex_unlock(&fs_info->scrub_lock);
325 wait_event(fs_info->scrub_pause_wait,
326 atomic_read(&fs_info->scrub_pause_req) == 0);
327 mutex_lock(&fs_info->scrub_lock);
328 }
329}
330
Zhaolei0e22be82015-08-05 16:43:28 +0800331static void scrub_pause_on(struct btrfs_fs_info *fs_info)
Wang Shilongcb7ab022013-12-04 21:16:53 +0800332{
333 atomic_inc(&fs_info->scrubs_paused);
334 wake_up(&fs_info->scrub_pause_wait);
Zhaolei0e22be82015-08-05 16:43:28 +0800335}
Wang Shilongcb7ab022013-12-04 21:16:53 +0800336
Zhaolei0e22be82015-08-05 16:43:28 +0800337static void scrub_pause_off(struct btrfs_fs_info *fs_info)
338{
Wang Shilongcb7ab022013-12-04 21:16:53 +0800339 mutex_lock(&fs_info->scrub_lock);
340 __scrub_blocked_if_needed(fs_info);
341 atomic_dec(&fs_info->scrubs_paused);
342 mutex_unlock(&fs_info->scrub_lock);
343
344 wake_up(&fs_info->scrub_pause_wait);
345}
346
Zhaolei0e22be82015-08-05 16:43:28 +0800347static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info)
348{
349 scrub_pause_on(fs_info);
350 scrub_pause_off(fs_info);
351}
352
Stefan Behrensb6bfebc2012-11-02 16:44:58 +0100353/*
354 * used for workers that require transaction commits (i.e., for the
355 * NOCOW case)
356 */
357static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx)
358{
359 struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
360
Filipe Mananaf55985f2015-02-09 21:14:24 +0000361 atomic_inc(&sctx->refs);
Stefan Behrensb6bfebc2012-11-02 16:44:58 +0100362 /*
363 * increment scrubs_running to prevent cancel requests from
364 * completing as long as a worker is running. we must also
365 * increment scrubs_paused to prevent deadlocking on pause
366 * requests used for transactions commits (as the worker uses a
367 * transaction context). it is safe to regard the worker
368 * as paused for all matters practical. effectively, we only
369 * avoid cancellation requests from completing.
370 */
371 mutex_lock(&fs_info->scrub_lock);
372 atomic_inc(&fs_info->scrubs_running);
373 atomic_inc(&fs_info->scrubs_paused);
374 mutex_unlock(&fs_info->scrub_lock);
Wang Shilong32a44782014-02-19 19:24:19 +0800375
376 /*
377 * check if @scrubs_running=@scrubs_paused condition
378 * inside wait_event() is not an atomic operation.
379 * which means we may inc/dec @scrub_running/paused
380 * at any time. Let's wake up @scrub_pause_wait as
381 * much as we can to let commit transaction blocked less.
382 */
383 wake_up(&fs_info->scrub_pause_wait);
384
Stefan Behrensb6bfebc2012-11-02 16:44:58 +0100385 atomic_inc(&sctx->workers_pending);
386}
387
388/* used for workers that require transaction commits */
389static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx)
390{
391 struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
392
393 /*
394 * see scrub_pending_trans_workers_inc() why we're pretending
395 * to be paused in the scrub counters
396 */
397 mutex_lock(&fs_info->scrub_lock);
398 atomic_dec(&fs_info->scrubs_running);
399 atomic_dec(&fs_info->scrubs_paused);
400 mutex_unlock(&fs_info->scrub_lock);
401 atomic_dec(&sctx->workers_pending);
402 wake_up(&fs_info->scrub_pause_wait);
403 wake_up(&sctx->list_wait);
Filipe Mananaf55985f2015-02-09 21:14:24 +0000404 scrub_put_ctx(sctx);
Stefan Behrensb6bfebc2012-11-02 16:44:58 +0100405}
406
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100407static void scrub_free_csums(struct scrub_ctx *sctx)
Arne Jansena2de7332011-03-08 14:14:00 +0100408{
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100409 while (!list_empty(&sctx->csum_list)) {
Arne Jansena2de7332011-03-08 14:14:00 +0100410 struct btrfs_ordered_sum *sum;
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100411 sum = list_first_entry(&sctx->csum_list,
Arne Jansena2de7332011-03-08 14:14:00 +0100412 struct btrfs_ordered_sum, list);
413 list_del(&sum->list);
414 kfree(sum);
415 }
416}
417
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100418static noinline_for_stack void scrub_free_ctx(struct scrub_ctx *sctx)
Arne Jansena2de7332011-03-08 14:14:00 +0100419{
420 int i;
Arne Jansena2de7332011-03-08 14:14:00 +0100421
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100422 if (!sctx)
Arne Jansena2de7332011-03-08 14:14:00 +0100423 return;
424
Stefan Behrensff023aa2012-11-06 11:43:11 +0100425 scrub_free_wr_ctx(&sctx->wr_ctx);
426
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400427 /* this can happen when scrub is cancelled */
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100428 if (sctx->curr != -1) {
429 struct scrub_bio *sbio = sctx->bios[sctx->curr];
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400430
431 for (i = 0; i < sbio->page_count; i++) {
Stefan Behrensff023aa2012-11-06 11:43:11 +0100432 WARN_ON(!sbio->pagev[i]->page);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400433 scrub_block_put(sbio->pagev[i]->sblock);
434 }
435 bio_put(sbio->bio);
436 }
437
Stefan Behrensff023aa2012-11-06 11:43:11 +0100438 for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100439 struct scrub_bio *sbio = sctx->bios[i];
Arne Jansena2de7332011-03-08 14:14:00 +0100440
441 if (!sbio)
442 break;
Arne Jansena2de7332011-03-08 14:14:00 +0100443 kfree(sbio);
444 }
445
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100446 scrub_free_csums(sctx);
447 kfree(sctx);
Arne Jansena2de7332011-03-08 14:14:00 +0100448}
449
Filipe Mananaf55985f2015-02-09 21:14:24 +0000450static void scrub_put_ctx(struct scrub_ctx *sctx)
451{
452 if (atomic_dec_and_test(&sctx->refs))
453 scrub_free_ctx(sctx);
454}
455
Arne Jansena2de7332011-03-08 14:14:00 +0100456static noinline_for_stack
Stefan Behrens63a212a2012-11-05 18:29:28 +0100457struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace)
Arne Jansena2de7332011-03-08 14:14:00 +0100458{
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100459 struct scrub_ctx *sctx;
Arne Jansena2de7332011-03-08 14:14:00 +0100460 int i;
Arne Jansena2de7332011-03-08 14:14:00 +0100461 struct btrfs_fs_info *fs_info = dev->dev_root->fs_info;
Stefan Behrensff023aa2012-11-06 11:43:11 +0100462 int ret;
Arne Jansena2de7332011-03-08 14:14:00 +0100463
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100464 sctx = kzalloc(sizeof(*sctx), GFP_NOFS);
465 if (!sctx)
Arne Jansena2de7332011-03-08 14:14:00 +0100466 goto nomem;
Filipe Mananaf55985f2015-02-09 21:14:24 +0000467 atomic_set(&sctx->refs, 1);
Stefan Behrens63a212a2012-11-05 18:29:28 +0100468 sctx->is_dev_replace = is_dev_replace;
Kent Overstreetb54ffb72015-05-19 14:31:01 +0200469 sctx->pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO;
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100470 sctx->curr = -1;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100471 sctx->dev_root = dev->dev_root;
Stefan Behrensff023aa2012-11-06 11:43:11 +0100472 for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) {
Arne Jansena2de7332011-03-08 14:14:00 +0100473 struct scrub_bio *sbio;
474
475 sbio = kzalloc(sizeof(*sbio), GFP_NOFS);
476 if (!sbio)
477 goto nomem;
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100478 sctx->bios[i] = sbio;
Arne Jansena2de7332011-03-08 14:14:00 +0100479
Arne Jansena2de7332011-03-08 14:14:00 +0100480 sbio->index = i;
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100481 sbio->sctx = sctx;
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400482 sbio->page_count = 0;
Liu Bo9e0af232014-08-15 23:36:53 +0800483 btrfs_init_work(&sbio->work, btrfs_scrub_helper,
484 scrub_bio_end_io_worker, NULL, NULL);
Arne Jansena2de7332011-03-08 14:14:00 +0100485
Stefan Behrensff023aa2012-11-06 11:43:11 +0100486 if (i != SCRUB_BIOS_PER_SCTX - 1)
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100487 sctx->bios[i]->next_free = i + 1;
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200488 else
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100489 sctx->bios[i]->next_free = -1;
Arne Jansena2de7332011-03-08 14:14:00 +0100490 }
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100491 sctx->first_free = 0;
492 sctx->nodesize = dev->dev_root->nodesize;
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100493 sctx->sectorsize = dev->dev_root->sectorsize;
Stefan Behrensb6bfebc2012-11-02 16:44:58 +0100494 atomic_set(&sctx->bios_in_flight, 0);
495 atomic_set(&sctx->workers_pending, 0);
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100496 atomic_set(&sctx->cancel_req, 0);
497 sctx->csum_size = btrfs_super_csum_size(fs_info->super_copy);
498 INIT_LIST_HEAD(&sctx->csum_list);
Arne Jansena2de7332011-03-08 14:14:00 +0100499
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100500 spin_lock_init(&sctx->list_lock);
501 spin_lock_init(&sctx->stat_lock);
502 init_waitqueue_head(&sctx->list_wait);
Stefan Behrensff023aa2012-11-06 11:43:11 +0100503
504 ret = scrub_setup_wr_ctx(sctx, &sctx->wr_ctx, fs_info,
505 fs_info->dev_replace.tgtdev, is_dev_replace);
506 if (ret) {
507 scrub_free_ctx(sctx);
508 return ERR_PTR(ret);
509 }
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100510 return sctx;
Arne Jansena2de7332011-03-08 14:14:00 +0100511
512nomem:
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100513 scrub_free_ctx(sctx);
Arne Jansena2de7332011-03-08 14:14:00 +0100514 return ERR_PTR(-ENOMEM);
515}
516
Stefan Behrensff023aa2012-11-06 11:43:11 +0100517static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root,
518 void *warn_ctx)
Jan Schmidt558540c2011-06-13 19:59:12 +0200519{
520 u64 isize;
521 u32 nlink;
522 int ret;
523 int i;
524 struct extent_buffer *eb;
525 struct btrfs_inode_item *inode_item;
Stefan Behrensff023aa2012-11-06 11:43:11 +0100526 struct scrub_warning *swarn = warn_ctx;
Jan Schmidt558540c2011-06-13 19:59:12 +0200527 struct btrfs_fs_info *fs_info = swarn->dev->dev_root->fs_info;
528 struct inode_fs_paths *ipath = NULL;
529 struct btrfs_root *local_root;
530 struct btrfs_key root_key;
David Sterba1d4c08e2015-01-02 19:36:14 +0100531 struct btrfs_key key;
Jan Schmidt558540c2011-06-13 19:59:12 +0200532
533 root_key.objectid = root;
534 root_key.type = BTRFS_ROOT_ITEM_KEY;
535 root_key.offset = (u64)-1;
536 local_root = btrfs_read_fs_root_no_name(fs_info, &root_key);
537 if (IS_ERR(local_root)) {
538 ret = PTR_ERR(local_root);
539 goto err;
540 }
541
David Sterba14692cc2015-01-02 18:55:46 +0100542 /*
543 * this makes the path point to (inum INODE_ITEM ioff)
544 */
David Sterba1d4c08e2015-01-02 19:36:14 +0100545 key.objectid = inum;
546 key.type = BTRFS_INODE_ITEM_KEY;
547 key.offset = 0;
548
549 ret = btrfs_search_slot(NULL, local_root, &key, swarn->path, 0, 0);
Jan Schmidt558540c2011-06-13 19:59:12 +0200550 if (ret) {
551 btrfs_release_path(swarn->path);
552 goto err;
553 }
554
555 eb = swarn->path->nodes[0];
556 inode_item = btrfs_item_ptr(eb, swarn->path->slots[0],
557 struct btrfs_inode_item);
558 isize = btrfs_inode_size(eb, inode_item);
559 nlink = btrfs_inode_nlink(eb, inode_item);
560 btrfs_release_path(swarn->path);
561
562 ipath = init_ipath(4096, local_root, swarn->path);
Dan Carpenter26bdef52011-11-16 11:28:01 +0300563 if (IS_ERR(ipath)) {
564 ret = PTR_ERR(ipath);
565 ipath = NULL;
566 goto err;
567 }
Jan Schmidt558540c2011-06-13 19:59:12 +0200568 ret = paths_from_inode(inum, ipath);
569
570 if (ret < 0)
571 goto err;
572
573 /*
574 * we deliberately ignore the bit ipath might have been too small to
575 * hold all of the paths here
576 */
577 for (i = 0; i < ipath->fspath->elem_cnt; ++i)
David Sterbaecaeb142015-10-08 09:01:03 +0200578 btrfs_warn_in_rcu(fs_info, "%s at logical %llu on dev "
Jan Schmidt558540c2011-06-13 19:59:12 +0200579 "%s, sector %llu, root %llu, inode %llu, offset %llu, "
David Sterbaecaeb142015-10-08 09:01:03 +0200580 "length %llu, links %u (path: %s)", swarn->errstr,
Josef Bacik606686e2012-06-04 14:03:51 -0400581 swarn->logical, rcu_str_deref(swarn->dev->name),
Jan Schmidt558540c2011-06-13 19:59:12 +0200582 (unsigned long long)swarn->sector, root, inum, offset,
583 min(isize - offset, (u64)PAGE_SIZE), nlink,
Jeff Mahoney745c4d82011-11-20 07:31:57 -0500584 (char *)(unsigned long)ipath->fspath->val[i]);
Jan Schmidt558540c2011-06-13 19:59:12 +0200585
586 free_ipath(ipath);
587 return 0;
588
589err:
David Sterbaecaeb142015-10-08 09:01:03 +0200590 btrfs_warn_in_rcu(fs_info, "%s at logical %llu on dev "
Jan Schmidt558540c2011-06-13 19:59:12 +0200591 "%s, sector %llu, root %llu, inode %llu, offset %llu: path "
David Sterbaecaeb142015-10-08 09:01:03 +0200592 "resolving failed with ret=%d", swarn->errstr,
Josef Bacik606686e2012-06-04 14:03:51 -0400593 swarn->logical, rcu_str_deref(swarn->dev->name),
Jan Schmidt558540c2011-06-13 19:59:12 +0200594 (unsigned long long)swarn->sector, root, inum, offset, ret);
595
596 free_ipath(ipath);
597 return 0;
598}
599
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400600static void scrub_print_warning(const char *errstr, struct scrub_block *sblock)
Jan Schmidt558540c2011-06-13 19:59:12 +0200601{
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100602 struct btrfs_device *dev;
603 struct btrfs_fs_info *fs_info;
Jan Schmidt558540c2011-06-13 19:59:12 +0200604 struct btrfs_path *path;
605 struct btrfs_key found_key;
606 struct extent_buffer *eb;
607 struct btrfs_extent_item *ei;
608 struct scrub_warning swarn;
Jan Schmidt558540c2011-06-13 19:59:12 +0200609 unsigned long ptr = 0;
Jan Schmidt4692cf52011-12-02 14:56:41 +0100610 u64 extent_item_pos;
Liu Bo69917e42012-09-07 20:01:28 -0600611 u64 flags = 0;
612 u64 ref_root;
613 u32 item_size;
614 u8 ref_level;
Liu Bo69917e42012-09-07 20:01:28 -0600615 int ret;
Jan Schmidt558540c2011-06-13 19:59:12 +0200616
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100617 WARN_ON(sblock->page_count < 1);
Stefan Behrens7a9e9982012-11-02 14:58:04 +0100618 dev = sblock->pagev[0]->dev;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100619 fs_info = sblock->sctx->dev_root->fs_info;
620
Jan Schmidt558540c2011-06-13 19:59:12 +0200621 path = btrfs_alloc_path();
David Sterba8b9456d2014-07-30 01:25:30 +0200622 if (!path)
623 return;
Jan Schmidt558540c2011-06-13 19:59:12 +0200624
Stefan Behrens7a9e9982012-11-02 14:58:04 +0100625 swarn.sector = (sblock->pagev[0]->physical) >> 9;
626 swarn.logical = sblock->pagev[0]->logical;
Jan Schmidt558540c2011-06-13 19:59:12 +0200627 swarn.errstr = errstr;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100628 swarn.dev = NULL;
Jan Schmidt558540c2011-06-13 19:59:12 +0200629
Liu Bo69917e42012-09-07 20:01:28 -0600630 ret = extent_from_logical(fs_info, swarn.logical, path, &found_key,
631 &flags);
Jan Schmidt558540c2011-06-13 19:59:12 +0200632 if (ret < 0)
633 goto out;
634
Jan Schmidt4692cf52011-12-02 14:56:41 +0100635 extent_item_pos = swarn.logical - found_key.objectid;
Jan Schmidt558540c2011-06-13 19:59:12 +0200636 swarn.extent_item_size = found_key.offset;
637
638 eb = path->nodes[0];
639 ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item);
640 item_size = btrfs_item_size_nr(eb, path->slots[0]);
641
Liu Bo69917e42012-09-07 20:01:28 -0600642 if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
Jan Schmidt558540c2011-06-13 19:59:12 +0200643 do {
Liu Bo6eda71d2014-06-09 10:54:07 +0800644 ret = tree_backref_for_extent(&ptr, eb, &found_key, ei,
645 item_size, &ref_root,
646 &ref_level);
David Sterbaecaeb142015-10-08 09:01:03 +0200647 btrfs_warn_in_rcu(fs_info,
648 "%s at logical %llu on dev %s, "
Jan Schmidt558540c2011-06-13 19:59:12 +0200649 "sector %llu: metadata %s (level %d) in tree "
David Sterbaecaeb142015-10-08 09:01:03 +0200650 "%llu", errstr, swarn.logical,
Josef Bacik606686e2012-06-04 14:03:51 -0400651 rcu_str_deref(dev->name),
Jan Schmidt558540c2011-06-13 19:59:12 +0200652 (unsigned long long)swarn.sector,
653 ref_level ? "node" : "leaf",
654 ret < 0 ? -1 : ref_level,
655 ret < 0 ? -1 : ref_root);
656 } while (ret != 1);
Josef Bacikd8fe29e2013-03-29 08:09:34 -0600657 btrfs_release_path(path);
Jan Schmidt558540c2011-06-13 19:59:12 +0200658 } else {
Josef Bacikd8fe29e2013-03-29 08:09:34 -0600659 btrfs_release_path(path);
Jan Schmidt558540c2011-06-13 19:59:12 +0200660 swarn.path = path;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100661 swarn.dev = dev;
Jan Schmidt7a3ae2f2012-03-23 17:32:28 +0100662 iterate_extent_inodes(fs_info, found_key.objectid,
663 extent_item_pos, 1,
Jan Schmidt558540c2011-06-13 19:59:12 +0200664 scrub_print_warning_inode, &swarn);
665 }
666
667out:
668 btrfs_free_path(path);
Jan Schmidt558540c2011-06-13 19:59:12 +0200669}
670
Stefan Behrensff023aa2012-11-06 11:43:11 +0100671static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *fixup_ctx)
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200672{
Jan Schmidt5da6fcb2011-08-04 18:11:04 +0200673 struct page *page = NULL;
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200674 unsigned long index;
Stefan Behrensff023aa2012-11-06 11:43:11 +0100675 struct scrub_fixup_nodatasum *fixup = fixup_ctx;
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200676 int ret;
Jan Schmidt5da6fcb2011-08-04 18:11:04 +0200677 int corrected = 0;
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200678 struct btrfs_key key;
Jan Schmidt5da6fcb2011-08-04 18:11:04 +0200679 struct inode *inode = NULL;
Liu Bo6f1c3602013-01-29 03:22:10 +0000680 struct btrfs_fs_info *fs_info;
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200681 u64 end = offset + PAGE_SIZE - 1;
682 struct btrfs_root *local_root;
Liu Bo6f1c3602013-01-29 03:22:10 +0000683 int srcu_index;
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200684
685 key.objectid = root;
686 key.type = BTRFS_ROOT_ITEM_KEY;
687 key.offset = (u64)-1;
Liu Bo6f1c3602013-01-29 03:22:10 +0000688
689 fs_info = fixup->root->fs_info;
690 srcu_index = srcu_read_lock(&fs_info->subvol_srcu);
691
692 local_root = btrfs_read_fs_root_no_name(fs_info, &key);
693 if (IS_ERR(local_root)) {
694 srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200695 return PTR_ERR(local_root);
Liu Bo6f1c3602013-01-29 03:22:10 +0000696 }
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200697
698 key.type = BTRFS_INODE_ITEM_KEY;
699 key.objectid = inum;
700 key.offset = 0;
Liu Bo6f1c3602013-01-29 03:22:10 +0000701 inode = btrfs_iget(fs_info->sb, &key, local_root, NULL);
702 srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200703 if (IS_ERR(inode))
704 return PTR_ERR(inode);
705
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200706 index = offset >> PAGE_CACHE_SHIFT;
707
708 page = find_or_create_page(inode->i_mapping, index, GFP_NOFS);
Jan Schmidt5da6fcb2011-08-04 18:11:04 +0200709 if (!page) {
710 ret = -ENOMEM;
711 goto out;
712 }
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200713
Jan Schmidt5da6fcb2011-08-04 18:11:04 +0200714 if (PageUptodate(page)) {
Jan Schmidt5da6fcb2011-08-04 18:11:04 +0200715 if (PageDirty(page)) {
716 /*
717 * we need to write the data to the defect sector. the
718 * data that was in that sector is not in memory,
719 * because the page was modified. we must not write the
720 * modified page to that sector.
721 *
722 * TODO: what could be done here: wait for the delalloc
723 * runner to write out that page (might involve
724 * COW) and see whether the sector is still
725 * referenced afterwards.
726 *
727 * For the meantime, we'll treat this error
728 * incorrectable, although there is a chance that a
729 * later scrub will find the bad sector again and that
730 * there's no dirty page in memory, then.
731 */
732 ret = -EIO;
733 goto out;
734 }
Miao Xie1203b682014-09-12 18:44:01 +0800735 ret = repair_io_failure(inode, offset, PAGE_SIZE,
Jan Schmidt5da6fcb2011-08-04 18:11:04 +0200736 fixup->logical, page,
Miao Xieffdd2012014-09-12 18:44:00 +0800737 offset - page_offset(page),
Jan Schmidt5da6fcb2011-08-04 18:11:04 +0200738 fixup->mirror_num);
739 unlock_page(page);
740 corrected = !ret;
741 } else {
742 /*
743 * we need to get good data first. the general readpage path
744 * will call repair_io_failure for us, we just have to make
745 * sure we read the bad mirror.
746 */
747 ret = set_extent_bits(&BTRFS_I(inode)->io_tree, offset, end,
748 EXTENT_DAMAGED, GFP_NOFS);
749 if (ret) {
750 /* set_extent_bits should give proper error */
751 WARN_ON(ret > 0);
752 if (ret > 0)
753 ret = -EFAULT;
754 goto out;
755 }
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200756
Jan Schmidt5da6fcb2011-08-04 18:11:04 +0200757 ret = extent_read_full_page(&BTRFS_I(inode)->io_tree, page,
758 btrfs_get_extent,
759 fixup->mirror_num);
760 wait_on_page_locked(page);
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200761
Jan Schmidt5da6fcb2011-08-04 18:11:04 +0200762 corrected = !test_range_bit(&BTRFS_I(inode)->io_tree, offset,
763 end, EXTENT_DAMAGED, 0, NULL);
764 if (!corrected)
765 clear_extent_bits(&BTRFS_I(inode)->io_tree, offset, end,
766 EXTENT_DAMAGED, GFP_NOFS);
767 }
768
769out:
770 if (page)
771 put_page(page);
Tobias Klauser7fb18a02014-04-25 14:58:05 +0200772
773 iput(inode);
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200774
775 if (ret < 0)
776 return ret;
777
778 if (ret == 0 && corrected) {
779 /*
780 * we only need to call readpage for one of the inodes belonging
781 * to this extent. so make iterate_extent_inodes stop
782 */
783 return 1;
784 }
785
786 return -EIO;
787}
788
789static void scrub_fixup_nodatasum(struct btrfs_work *work)
790{
791 int ret;
792 struct scrub_fixup_nodatasum *fixup;
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100793 struct scrub_ctx *sctx;
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200794 struct btrfs_trans_handle *trans = NULL;
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200795 struct btrfs_path *path;
796 int uncorrectable = 0;
797
798 fixup = container_of(work, struct scrub_fixup_nodatasum, work);
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100799 sctx = fixup->sctx;
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200800
801 path = btrfs_alloc_path();
802 if (!path) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100803 spin_lock(&sctx->stat_lock);
804 ++sctx->stat.malloc_errors;
805 spin_unlock(&sctx->stat_lock);
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200806 uncorrectable = 1;
807 goto out;
808 }
809
810 trans = btrfs_join_transaction(fixup->root);
811 if (IS_ERR(trans)) {
812 uncorrectable = 1;
813 goto out;
814 }
815
816 /*
817 * the idea is to trigger a regular read through the standard path. we
818 * read a page from the (failed) logical address by specifying the
819 * corresponding copynum of the failed sector. thus, that readpage is
820 * expected to fail.
821 * that is the point where on-the-fly error correction will kick in
822 * (once it's finished) and rewrite the failed sector if a good copy
823 * can be found.
824 */
825 ret = iterate_inodes_from_logical(fixup->logical, fixup->root->fs_info,
826 path, scrub_fixup_readpage,
827 fixup);
828 if (ret < 0) {
829 uncorrectable = 1;
830 goto out;
831 }
832 WARN_ON(ret != 1);
833
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100834 spin_lock(&sctx->stat_lock);
835 ++sctx->stat.corrected_errors;
836 spin_unlock(&sctx->stat_lock);
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200837
838out:
839 if (trans && !IS_ERR(trans))
840 btrfs_end_transaction(trans, fixup->root);
841 if (uncorrectable) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100842 spin_lock(&sctx->stat_lock);
843 ++sctx->stat.uncorrectable_errors;
844 spin_unlock(&sctx->stat_lock);
Stefan Behrensff023aa2012-11-06 11:43:11 +0100845 btrfs_dev_replace_stats_inc(
846 &sctx->dev_root->fs_info->dev_replace.
847 num_uncorrectable_read_errors);
David Sterbab14af3b2015-10-08 10:43:10 +0200848 btrfs_err_rl_in_rcu(sctx->dev_root->fs_info,
849 "unable to fixup (nodatasum) error at logical %llu on dev %s",
Geert Uytterhoevenc1c9ff72013-08-20 13:20:07 +0200850 fixup->logical, rcu_str_deref(fixup->dev->name));
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200851 }
852
853 btrfs_free_path(path);
854 kfree(fixup);
855
Stefan Behrensb6bfebc2012-11-02 16:44:58 +0100856 scrub_pending_trans_workers_dec(sctx);
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200857}
858
Miao Xieaf8e2d12014-10-23 14:42:50 +0800859static inline void scrub_get_recover(struct scrub_recover *recover)
860{
861 atomic_inc(&recover->refs);
862}
863
864static inline void scrub_put_recover(struct scrub_recover *recover)
865{
866 if (atomic_dec_and_test(&recover->refs)) {
Zhao Lei6e9606d2015-01-20 15:11:34 +0800867 btrfs_put_bbio(recover->bbio);
Miao Xieaf8e2d12014-10-23 14:42:50 +0800868 kfree(recover);
869 }
870}
871
Arne Jansena2de7332011-03-08 14:14:00 +0100872/*
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400873 * scrub_handle_errored_block gets called when either verification of the
874 * pages failed or the bio failed to read, e.g. with EIO. In the latter
875 * case, this function handles all pages in the bio, even though only one
876 * may be bad.
877 * The goal of this function is to repair the errored block by using the
878 * contents of one of the mirrors.
Arne Jansena2de7332011-03-08 14:14:00 +0100879 */
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400880static int scrub_handle_errored_block(struct scrub_block *sblock_to_check)
Arne Jansena2de7332011-03-08 14:14:00 +0100881{
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100882 struct scrub_ctx *sctx = sblock_to_check->sctx;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100883 struct btrfs_device *dev;
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400884 struct btrfs_fs_info *fs_info;
Arne Jansena2de7332011-03-08 14:14:00 +0100885 u64 length;
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400886 u64 logical;
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400887 unsigned int failed_mirror_index;
888 unsigned int is_metadata;
889 unsigned int have_csum;
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400890 struct scrub_block *sblocks_for_recheck; /* holds one for each mirror */
891 struct scrub_block *sblock_bad;
Arne Jansena2de7332011-03-08 14:14:00 +0100892 int ret;
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400893 int mirror_index;
894 int page_num;
895 int success;
896 static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL,
897 DEFAULT_RATELIMIT_BURST);
Arne Jansena2de7332011-03-08 14:14:00 +0100898
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400899 BUG_ON(sblock_to_check->page_count < 1);
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100900 fs_info = sctx->dev_root->fs_info;
Stefan Behrens4ded4f62012-11-14 18:57:29 +0000901 if (sblock_to_check->pagev[0]->flags & BTRFS_EXTENT_FLAG_SUPER) {
902 /*
903 * if we find an error in a super block, we just report it.
904 * They will get written with the next transaction commit
905 * anyway
906 */
907 spin_lock(&sctx->stat_lock);
908 ++sctx->stat.super_errors;
909 spin_unlock(&sctx->stat_lock);
910 return 0;
911 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400912 length = sblock_to_check->page_count * PAGE_SIZE;
Stefan Behrens7a9e9982012-11-02 14:58:04 +0100913 logical = sblock_to_check->pagev[0]->logical;
Stefan Behrens7a9e9982012-11-02 14:58:04 +0100914 BUG_ON(sblock_to_check->pagev[0]->mirror_num < 1);
915 failed_mirror_index = sblock_to_check->pagev[0]->mirror_num - 1;
916 is_metadata = !(sblock_to_check->pagev[0]->flags &
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400917 BTRFS_EXTENT_FLAG_DATA);
Stefan Behrens7a9e9982012-11-02 14:58:04 +0100918 have_csum = sblock_to_check->pagev[0]->have_csum;
Stefan Behrens7a9e9982012-11-02 14:58:04 +0100919 dev = sblock_to_check->pagev[0]->dev;
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400920
Stefan Behrensff023aa2012-11-06 11:43:11 +0100921 if (sctx->is_dev_replace && !is_metadata && !have_csum) {
922 sblocks_for_recheck = NULL;
923 goto nodatasum_case;
924 }
925
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400926 /*
927 * read all mirrors one after the other. This includes to
928 * re-read the extent or metadata block that failed (that was
929 * the cause that this fixup code is called) another time,
930 * page by page this time in order to know which pages
931 * caused I/O errors and which ones are good (for all mirrors).
932 * It is the goal to handle the situation when more than one
933 * mirror contains I/O errors, but the errors do not
934 * overlap, i.e. the data can be repaired by selecting the
935 * pages from those mirrors without I/O error on the
936 * particular pages. One example (with blocks >= 2 * PAGE_SIZE)
937 * would be that mirror #1 has an I/O error on the first page,
938 * the second page is good, and mirror #2 has an I/O error on
939 * the second page, but the first page is good.
940 * Then the first page of the first mirror can be repaired by
941 * taking the first page of the second mirror, and the
942 * second page of the second mirror can be repaired by
943 * copying the contents of the 2nd page of the 1st mirror.
944 * One more note: if the pages of one mirror contain I/O
945 * errors, the checksum cannot be verified. In order to get
946 * the best data for repairing, the first attempt is to find
947 * a mirror without I/O errors and with a validated checksum.
948 * Only if this is not possible, the pages are picked from
949 * mirrors with I/O errors without considering the checksum.
950 * If the latter is the case, at the end, the checksum of the
951 * repaired area is verified in order to correctly maintain
952 * the statistics.
953 */
954
David Sterba31e818f2015-02-20 18:00:26 +0100955 sblocks_for_recheck = kcalloc(BTRFS_MAX_MIRRORS,
956 sizeof(*sblocks_for_recheck), GFP_NOFS);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400957 if (!sblocks_for_recheck) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100958 spin_lock(&sctx->stat_lock);
959 sctx->stat.malloc_errors++;
960 sctx->stat.read_errors++;
961 sctx->stat.uncorrectable_errors++;
962 spin_unlock(&sctx->stat_lock);
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100963 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400964 goto out;
965 }
966
967 /* setup the context, map the logical blocks and alloc the pages */
Zhao Leibe50a8d2015-01-20 15:11:42 +0800968 ret = scrub_setup_recheck_block(sblock_to_check, sblocks_for_recheck);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400969 if (ret) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100970 spin_lock(&sctx->stat_lock);
971 sctx->stat.read_errors++;
972 sctx->stat.uncorrectable_errors++;
973 spin_unlock(&sctx->stat_lock);
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100974 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400975 goto out;
976 }
977 BUG_ON(failed_mirror_index >= BTRFS_MAX_MIRRORS);
978 sblock_bad = sblocks_for_recheck + failed_mirror_index;
979
980 /* build and submit the bios for the failed mirror, check checksums */
Zhao Leiaffe4a52015-08-24 21:32:06 +0800981 scrub_recheck_block(fs_info, sblock_bad, 1);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400982
983 if (!sblock_bad->header_error && !sblock_bad->checksum_error &&
984 sblock_bad->no_io_error_seen) {
985 /*
986 * the error disappeared after reading page by page, or
987 * the area was part of a huge bio and other parts of the
988 * bio caused I/O errors, or the block layer merged several
989 * read requests into one and the error is caused by a
990 * different bio (usually one of the two latter cases is
991 * the cause)
992 */
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100993 spin_lock(&sctx->stat_lock);
994 sctx->stat.unverified_errors++;
Miao Xie5a6ac9e2014-11-06 17:20:58 +0800995 sblock_to_check->data_corrected = 1;
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100996 spin_unlock(&sctx->stat_lock);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400997
Stefan Behrensff023aa2012-11-06 11:43:11 +0100998 if (sctx->is_dev_replace)
999 scrub_write_block_to_dev_replace(sblock_bad);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001000 goto out;
1001 }
1002
1003 if (!sblock_bad->no_io_error_seen) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001004 spin_lock(&sctx->stat_lock);
1005 sctx->stat.read_errors++;
1006 spin_unlock(&sctx->stat_lock);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001007 if (__ratelimit(&_rs))
1008 scrub_print_warning("i/o error", sblock_to_check);
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01001009 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001010 } else if (sblock_bad->checksum_error) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001011 spin_lock(&sctx->stat_lock);
1012 sctx->stat.csum_errors++;
1013 spin_unlock(&sctx->stat_lock);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001014 if (__ratelimit(&_rs))
1015 scrub_print_warning("checksum error", sblock_to_check);
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01001016 btrfs_dev_stat_inc_and_print(dev,
Stefan Behrens442a4f62012-05-25 16:06:08 +02001017 BTRFS_DEV_STAT_CORRUPTION_ERRS);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001018 } else if (sblock_bad->header_error) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001019 spin_lock(&sctx->stat_lock);
1020 sctx->stat.verify_errors++;
1021 spin_unlock(&sctx->stat_lock);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001022 if (__ratelimit(&_rs))
1023 scrub_print_warning("checksum/header error",
1024 sblock_to_check);
Stefan Behrens442a4f62012-05-25 16:06:08 +02001025 if (sblock_bad->generation_error)
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01001026 btrfs_dev_stat_inc_and_print(dev,
Stefan Behrens442a4f62012-05-25 16:06:08 +02001027 BTRFS_DEV_STAT_GENERATION_ERRS);
1028 else
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01001029 btrfs_dev_stat_inc_and_print(dev,
Stefan Behrens442a4f62012-05-25 16:06:08 +02001030 BTRFS_DEV_STAT_CORRUPTION_ERRS);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001031 }
1032
Ilya Dryomov33ef30a2013-11-03 19:06:38 +02001033 if (sctx->readonly) {
1034 ASSERT(!sctx->is_dev_replace);
1035 goto out;
1036 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001037
1038 if (!is_metadata && !have_csum) {
1039 struct scrub_fixup_nodatasum *fixup_nodatasum;
1040
Stefan Behrensff023aa2012-11-06 11:43:11 +01001041 WARN_ON(sctx->is_dev_replace);
1042
Zhao Leib25c94c2015-01-20 15:11:35 +08001043nodatasum_case:
1044
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001045 /*
1046 * !is_metadata and !have_csum, this means that the data
1047 * might not be COW'ed, that it might be modified
1048 * concurrently. The general strategy to work on the
1049 * commit root does not help in the case when COW is not
1050 * used.
1051 */
1052 fixup_nodatasum = kzalloc(sizeof(*fixup_nodatasum), GFP_NOFS);
1053 if (!fixup_nodatasum)
1054 goto did_not_correct_error;
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001055 fixup_nodatasum->sctx = sctx;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01001056 fixup_nodatasum->dev = dev;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001057 fixup_nodatasum->logical = logical;
1058 fixup_nodatasum->root = fs_info->extent_root;
1059 fixup_nodatasum->mirror_num = failed_mirror_index + 1;
Stefan Behrensb6bfebc2012-11-02 16:44:58 +01001060 scrub_pending_trans_workers_inc(sctx);
Liu Bo9e0af232014-08-15 23:36:53 +08001061 btrfs_init_work(&fixup_nodatasum->work, btrfs_scrub_helper,
1062 scrub_fixup_nodatasum, NULL, NULL);
Qu Wenruo0339ef22014-02-28 10:46:17 +08001063 btrfs_queue_work(fs_info->scrub_workers,
1064 &fixup_nodatasum->work);
Arne Jansena2de7332011-03-08 14:14:00 +01001065 goto out;
1066 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001067
1068 /*
1069 * now build and submit the bios for the other mirrors, check
Stefan Behrenscb2ced72012-11-02 16:14:21 +01001070 * checksums.
1071 * First try to pick the mirror which is completely without I/O
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001072 * errors and also does not have a checksum error.
1073 * If one is found, and if a checksum is present, the full block
1074 * that is known to contain an error is rewritten. Afterwards
1075 * the block is known to be corrected.
1076 * If a mirror is found which is completely correct, and no
1077 * checksum is present, only those pages are rewritten that had
1078 * an I/O error in the block to be repaired, since it cannot be
1079 * determined, which copy of the other pages is better (and it
1080 * could happen otherwise that a correct page would be
1081 * overwritten by a bad one).
1082 */
1083 for (mirror_index = 0;
1084 mirror_index < BTRFS_MAX_MIRRORS &&
1085 sblocks_for_recheck[mirror_index].page_count > 0;
1086 mirror_index++) {
Stefan Behrenscb2ced72012-11-02 16:14:21 +01001087 struct scrub_block *sblock_other;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001088
Stefan Behrenscb2ced72012-11-02 16:14:21 +01001089 if (mirror_index == failed_mirror_index)
1090 continue;
1091 sblock_other = sblocks_for_recheck + mirror_index;
1092
1093 /* build and submit the bios, check checksums */
Zhao Leiaffe4a52015-08-24 21:32:06 +08001094 scrub_recheck_block(fs_info, sblock_other, 0);
Stefan Behrens34f5c8e2012-11-02 16:16:26 +01001095
1096 if (!sblock_other->header_error &&
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001097 !sblock_other->checksum_error &&
1098 sblock_other->no_io_error_seen) {
Stefan Behrensff023aa2012-11-06 11:43:11 +01001099 if (sctx->is_dev_replace) {
1100 scrub_write_block_to_dev_replace(sblock_other);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001101 goto corrected_error;
Zhao Lei114ab502015-01-20 15:11:36 +08001102 } else {
1103 ret = scrub_repair_block_from_good_copy(
1104 sblock_bad, sblock_other);
1105 if (!ret)
1106 goto corrected_error;
1107 }
Arne Jansena2de7332011-03-08 14:14:00 +01001108 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001109 }
1110
Zhao Leib968fed2015-01-20 15:11:41 +08001111 if (sblock_bad->no_io_error_seen && !sctx->is_dev_replace)
1112 goto did_not_correct_error;
Stefan Behrensff023aa2012-11-06 11:43:11 +01001113
1114 /*
Stefan Behrensff023aa2012-11-06 11:43:11 +01001115 * In case of I/O errors in the area that is supposed to be
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001116 * repaired, continue by picking good copies of those pages.
1117 * Select the good pages from mirrors to rewrite bad pages from
1118 * the area to fix. Afterwards verify the checksum of the block
1119 * that is supposed to be repaired. This verification step is
1120 * only done for the purpose of statistic counting and for the
1121 * final scrub report, whether errors remain.
1122 * A perfect algorithm could make use of the checksum and try
1123 * all possible combinations of pages from the different mirrors
1124 * until the checksum verification succeeds. For example, when
1125 * the 2nd page of mirror #1 faces I/O errors, and the 2nd page
1126 * of mirror #2 is readable but the final checksum test fails,
1127 * then the 2nd page of mirror #3 could be tried, whether now
1128 * the final checksum succeedes. But this would be a rare
1129 * exception and is therefore not implemented. At least it is
1130 * avoided that the good copy is overwritten.
1131 * A more useful improvement would be to pick the sectors
1132 * without I/O error based on sector sizes (512 bytes on legacy
1133 * disks) instead of on PAGE_SIZE. Then maybe 512 byte of one
1134 * mirror could be repaired by taking 512 byte of a different
1135 * mirror, even if other 512 byte sectors in the same PAGE_SIZE
1136 * area are unreadable.
1137 */
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001138 success = 1;
Zhao Leib968fed2015-01-20 15:11:41 +08001139 for (page_num = 0; page_num < sblock_bad->page_count;
1140 page_num++) {
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001141 struct scrub_page *page_bad = sblock_bad->pagev[page_num];
Zhao Leib968fed2015-01-20 15:11:41 +08001142 struct scrub_block *sblock_other = NULL;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001143
Zhao Leib968fed2015-01-20 15:11:41 +08001144 /* skip no-io-error page in scrub */
1145 if (!page_bad->io_error && !sctx->is_dev_replace)
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001146 continue;
1147
Zhao Leib968fed2015-01-20 15:11:41 +08001148 /* try to find no-io-error page in mirrors */
1149 if (page_bad->io_error) {
1150 for (mirror_index = 0;
1151 mirror_index < BTRFS_MAX_MIRRORS &&
1152 sblocks_for_recheck[mirror_index].page_count > 0;
1153 mirror_index++) {
1154 if (!sblocks_for_recheck[mirror_index].
1155 pagev[page_num]->io_error) {
1156 sblock_other = sblocks_for_recheck +
1157 mirror_index;
1158 break;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001159 }
Jan Schmidt13db62b2011-06-13 19:56:13 +02001160 }
Zhao Leib968fed2015-01-20 15:11:41 +08001161 if (!sblock_other)
1162 success = 0;
Jan Schmidt13db62b2011-06-13 19:56:13 +02001163 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001164
Zhao Leib968fed2015-01-20 15:11:41 +08001165 if (sctx->is_dev_replace) {
1166 /*
1167 * did not find a mirror to fetch the page
1168 * from. scrub_write_page_to_dev_replace()
1169 * handles this case (page->io_error), by
1170 * filling the block with zeros before
1171 * submitting the write request
1172 */
1173 if (!sblock_other)
1174 sblock_other = sblock_bad;
1175
1176 if (scrub_write_page_to_dev_replace(sblock_other,
1177 page_num) != 0) {
1178 btrfs_dev_replace_stats_inc(
1179 &sctx->dev_root->
1180 fs_info->dev_replace.
1181 num_write_errors);
1182 success = 0;
1183 }
1184 } else if (sblock_other) {
1185 ret = scrub_repair_page_from_good_copy(sblock_bad,
1186 sblock_other,
1187 page_num, 0);
1188 if (0 == ret)
1189 page_bad->io_error = 0;
1190 else
1191 success = 0;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001192 }
1193 }
1194
Zhao Leib968fed2015-01-20 15:11:41 +08001195 if (success && !sctx->is_dev_replace) {
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001196 if (is_metadata || have_csum) {
1197 /*
1198 * need to verify the checksum now that all
1199 * sectors on disk are repaired (the write
1200 * request for data to be repaired is on its way).
1201 * Just be lazy and use scrub_recheck_block()
1202 * which re-reads the data before the checksum
1203 * is verified, but most likely the data comes out
1204 * of the page cache.
1205 */
Zhao Leiaffe4a52015-08-24 21:32:06 +08001206 scrub_recheck_block(fs_info, sblock_bad, 1);
Stefan Behrens34f5c8e2012-11-02 16:16:26 +01001207 if (!sblock_bad->header_error &&
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001208 !sblock_bad->checksum_error &&
1209 sblock_bad->no_io_error_seen)
1210 goto corrected_error;
1211 else
1212 goto did_not_correct_error;
1213 } else {
1214corrected_error:
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001215 spin_lock(&sctx->stat_lock);
1216 sctx->stat.corrected_errors++;
Miao Xie5a6ac9e2014-11-06 17:20:58 +08001217 sblock_to_check->data_corrected = 1;
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001218 spin_unlock(&sctx->stat_lock);
David Sterbab14af3b2015-10-08 10:43:10 +02001219 btrfs_err_rl_in_rcu(fs_info,
1220 "fixed up error at logical %llu on dev %s",
Geert Uytterhoevenc1c9ff72013-08-20 13:20:07 +02001221 logical, rcu_str_deref(dev->name));
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001222 }
1223 } else {
1224did_not_correct_error:
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001225 spin_lock(&sctx->stat_lock);
1226 sctx->stat.uncorrectable_errors++;
1227 spin_unlock(&sctx->stat_lock);
David Sterbab14af3b2015-10-08 10:43:10 +02001228 btrfs_err_rl_in_rcu(fs_info,
1229 "unable to fixup (regular) error at logical %llu on dev %s",
Geert Uytterhoevenc1c9ff72013-08-20 13:20:07 +02001230 logical, rcu_str_deref(dev->name));
Arne Jansena2de7332011-03-08 14:14:00 +01001231 }
1232
1233out:
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001234 if (sblocks_for_recheck) {
1235 for (mirror_index = 0; mirror_index < BTRFS_MAX_MIRRORS;
1236 mirror_index++) {
1237 struct scrub_block *sblock = sblocks_for_recheck +
1238 mirror_index;
Miao Xieaf8e2d12014-10-23 14:42:50 +08001239 struct scrub_recover *recover;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001240 int page_index;
1241
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001242 for (page_index = 0; page_index < sblock->page_count;
1243 page_index++) {
1244 sblock->pagev[page_index]->sblock = NULL;
Miao Xieaf8e2d12014-10-23 14:42:50 +08001245 recover = sblock->pagev[page_index]->recover;
1246 if (recover) {
1247 scrub_put_recover(recover);
1248 sblock->pagev[page_index]->recover =
1249 NULL;
1250 }
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001251 scrub_page_put(sblock->pagev[page_index]);
1252 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001253 }
1254 kfree(sblocks_for_recheck);
1255 }
1256
1257 return 0;
Arne Jansena2de7332011-03-08 14:14:00 +01001258}
1259
Zhao Lei8e5cfb52015-01-20 15:11:33 +08001260static inline int scrub_nr_raid_mirrors(struct btrfs_bio *bbio)
Miao Xieaf8e2d12014-10-23 14:42:50 +08001261{
Zhao Lei10f11902015-01-20 15:11:43 +08001262 if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID5)
1263 return 2;
1264 else if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID6)
1265 return 3;
1266 else
Miao Xieaf8e2d12014-10-23 14:42:50 +08001267 return (int)bbio->num_stripes;
Miao Xieaf8e2d12014-10-23 14:42:50 +08001268}
1269
Zhao Lei10f11902015-01-20 15:11:43 +08001270static inline void scrub_stripe_index_and_offset(u64 logical, u64 map_type,
1271 u64 *raid_map,
Miao Xieaf8e2d12014-10-23 14:42:50 +08001272 u64 mapped_length,
1273 int nstripes, int mirror,
1274 int *stripe_index,
1275 u64 *stripe_offset)
1276{
1277 int i;
1278
Zhao Leiffe2d202015-01-20 15:11:44 +08001279 if (map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
Miao Xieaf8e2d12014-10-23 14:42:50 +08001280 /* RAID5/6 */
1281 for (i = 0; i < nstripes; i++) {
1282 if (raid_map[i] == RAID6_Q_STRIPE ||
1283 raid_map[i] == RAID5_P_STRIPE)
1284 continue;
1285
1286 if (logical >= raid_map[i] &&
1287 logical < raid_map[i] + mapped_length)
1288 break;
1289 }
1290
1291 *stripe_index = i;
1292 *stripe_offset = logical - raid_map[i];
1293 } else {
1294 /* The other RAID type */
1295 *stripe_index = mirror;
1296 *stripe_offset = 0;
1297 }
1298}
1299
Zhao Leibe50a8d2015-01-20 15:11:42 +08001300static int scrub_setup_recheck_block(struct scrub_block *original_sblock,
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001301 struct scrub_block *sblocks_for_recheck)
Arne Jansena2de7332011-03-08 14:14:00 +01001302{
Zhao Leibe50a8d2015-01-20 15:11:42 +08001303 struct scrub_ctx *sctx = original_sblock->sctx;
1304 struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
1305 u64 length = original_sblock->page_count * PAGE_SIZE;
1306 u64 logical = original_sblock->pagev[0]->logical;
Zhao Lei4734b7e2015-08-19 22:39:18 +08001307 u64 generation = original_sblock->pagev[0]->generation;
1308 u64 flags = original_sblock->pagev[0]->flags;
1309 u64 have_csum = original_sblock->pagev[0]->have_csum;
Miao Xieaf8e2d12014-10-23 14:42:50 +08001310 struct scrub_recover *recover;
1311 struct btrfs_bio *bbio;
Miao Xieaf8e2d12014-10-23 14:42:50 +08001312 u64 sublen;
1313 u64 mapped_length;
1314 u64 stripe_offset;
1315 int stripe_index;
Zhao Leibe50a8d2015-01-20 15:11:42 +08001316 int page_index = 0;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001317 int mirror_index;
Miao Xieaf8e2d12014-10-23 14:42:50 +08001318 int nmirrors;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001319 int ret;
1320
1321 /*
Zhao Lei57019342015-01-20 15:11:45 +08001322 * note: the two members refs and outstanding_pages
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001323 * are not used (and not set) in the blocks that are used for
1324 * the recheck procedure
1325 */
1326
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001327 while (length > 0) {
Miao Xieaf8e2d12014-10-23 14:42:50 +08001328 sublen = min_t(u64, length, PAGE_SIZE);
1329 mapped_length = sublen;
1330 bbio = NULL;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001331
1332 /*
1333 * with a length of PAGE_SIZE, each returned stripe
1334 * represents one mirror
1335 */
Miao Xieaf8e2d12014-10-23 14:42:50 +08001336 ret = btrfs_map_sblock(fs_info, REQ_GET_READ_MIRRORS, logical,
Zhao Lei8e5cfb52015-01-20 15:11:33 +08001337 &mapped_length, &bbio, 0, 1);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001338 if (ret || !bbio || mapped_length < sublen) {
Zhao Lei6e9606d2015-01-20 15:11:34 +08001339 btrfs_put_bbio(bbio);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001340 return -EIO;
1341 }
1342
Miao Xieaf8e2d12014-10-23 14:42:50 +08001343 recover = kzalloc(sizeof(struct scrub_recover), GFP_NOFS);
1344 if (!recover) {
Zhao Lei6e9606d2015-01-20 15:11:34 +08001345 btrfs_put_bbio(bbio);
Miao Xieaf8e2d12014-10-23 14:42:50 +08001346 return -ENOMEM;
1347 }
1348
1349 atomic_set(&recover->refs, 1);
1350 recover->bbio = bbio;
Miao Xieaf8e2d12014-10-23 14:42:50 +08001351 recover->map_length = mapped_length;
1352
Stefan Behrensff023aa2012-11-06 11:43:11 +01001353 BUG_ON(page_index >= SCRUB_PAGES_PER_RD_BIO);
Miao Xieaf8e2d12014-10-23 14:42:50 +08001354
Zhao Leibe50a8d2015-01-20 15:11:42 +08001355 nmirrors = min(scrub_nr_raid_mirrors(bbio), BTRFS_MAX_MIRRORS);
Zhao Lei10f11902015-01-20 15:11:43 +08001356
Miao Xieaf8e2d12014-10-23 14:42:50 +08001357 for (mirror_index = 0; mirror_index < nmirrors;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001358 mirror_index++) {
1359 struct scrub_block *sblock;
1360 struct scrub_page *page;
1361
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001362 sblock = sblocks_for_recheck + mirror_index;
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001363 sblock->sctx = sctx;
Zhao Lei4734b7e2015-08-19 22:39:18 +08001364
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001365 page = kzalloc(sizeof(*page), GFP_NOFS);
1366 if (!page) {
1367leave_nomem:
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001368 spin_lock(&sctx->stat_lock);
1369 sctx->stat.malloc_errors++;
1370 spin_unlock(&sctx->stat_lock);
Miao Xieaf8e2d12014-10-23 14:42:50 +08001371 scrub_put_recover(recover);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001372 return -ENOMEM;
1373 }
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001374 scrub_page_get(page);
1375 sblock->pagev[page_index] = page;
Zhao Lei4734b7e2015-08-19 22:39:18 +08001376 page->sblock = sblock;
1377 page->flags = flags;
1378 page->generation = generation;
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001379 page->logical = logical;
Zhao Lei4734b7e2015-08-19 22:39:18 +08001380 page->have_csum = have_csum;
1381 if (have_csum)
1382 memcpy(page->csum,
1383 original_sblock->pagev[0]->csum,
1384 sctx->csum_size);
Miao Xieaf8e2d12014-10-23 14:42:50 +08001385
Zhao Lei10f11902015-01-20 15:11:43 +08001386 scrub_stripe_index_and_offset(logical,
1387 bbio->map_type,
1388 bbio->raid_map,
Miao Xieaf8e2d12014-10-23 14:42:50 +08001389 mapped_length,
Zhao Leie34c3302015-01-20 15:11:31 +08001390 bbio->num_stripes -
1391 bbio->num_tgtdevs,
Miao Xieaf8e2d12014-10-23 14:42:50 +08001392 mirror_index,
1393 &stripe_index,
1394 &stripe_offset);
1395 page->physical = bbio->stripes[stripe_index].physical +
1396 stripe_offset;
1397 page->dev = bbio->stripes[stripe_index].dev;
1398
Stefan Behrensff023aa2012-11-06 11:43:11 +01001399 BUG_ON(page_index >= original_sblock->page_count);
1400 page->physical_for_dev_replace =
1401 original_sblock->pagev[page_index]->
1402 physical_for_dev_replace;
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001403 /* for missing devices, dev->bdev is NULL */
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001404 page->mirror_num = mirror_index + 1;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001405 sblock->page_count++;
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001406 page->page = alloc_page(GFP_NOFS);
1407 if (!page->page)
1408 goto leave_nomem;
Miao Xieaf8e2d12014-10-23 14:42:50 +08001409
1410 scrub_get_recover(recover);
1411 page->recover = recover;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001412 }
Miao Xieaf8e2d12014-10-23 14:42:50 +08001413 scrub_put_recover(recover);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001414 length -= sublen;
1415 logical += sublen;
1416 page_index++;
1417 }
1418
1419 return 0;
1420}
1421
Miao Xieaf8e2d12014-10-23 14:42:50 +08001422struct scrub_bio_ret {
1423 struct completion event;
1424 int error;
1425};
1426
Christoph Hellwig4246a0b2015-07-20 15:29:37 +02001427static void scrub_bio_wait_endio(struct bio *bio)
Miao Xieaf8e2d12014-10-23 14:42:50 +08001428{
1429 struct scrub_bio_ret *ret = bio->bi_private;
1430
Christoph Hellwig4246a0b2015-07-20 15:29:37 +02001431 ret->error = bio->bi_error;
Miao Xieaf8e2d12014-10-23 14:42:50 +08001432 complete(&ret->event);
1433}
1434
1435static inline int scrub_is_page_on_raid56(struct scrub_page *page)
1436{
Zhao Lei10f11902015-01-20 15:11:43 +08001437 return page->recover &&
Zhao Leiffe2d202015-01-20 15:11:44 +08001438 (page->recover->bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK);
Miao Xieaf8e2d12014-10-23 14:42:50 +08001439}
1440
1441static int scrub_submit_raid56_bio_wait(struct btrfs_fs_info *fs_info,
1442 struct bio *bio,
1443 struct scrub_page *page)
1444{
1445 struct scrub_bio_ret done;
1446 int ret;
1447
1448 init_completion(&done.event);
1449 done.error = 0;
1450 bio->bi_iter.bi_sector = page->logical >> 9;
1451 bio->bi_private = &done;
1452 bio->bi_end_io = scrub_bio_wait_endio;
1453
1454 ret = raid56_parity_recover(fs_info->fs_root, bio, page->recover->bbio,
Miao Xieaf8e2d12014-10-23 14:42:50 +08001455 page->recover->map_length,
Miao Xie42452152014-11-25 16:39:28 +08001456 page->mirror_num, 0);
Miao Xieaf8e2d12014-10-23 14:42:50 +08001457 if (ret)
1458 return ret;
1459
1460 wait_for_completion(&done.event);
1461 if (done.error)
1462 return -EIO;
1463
1464 return 0;
1465}
1466
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001467/*
1468 * this function will check the on disk data for checksum errors, header
1469 * errors and read I/O errors. If any I/O errors happen, the exact pages
1470 * which are errored are marked as being bad. The goal is to enable scrub
1471 * to take those pages that are not errored from all the mirrors so that
1472 * the pages that are errored in the just handled mirror can be repaired.
1473 */
Stefan Behrens34f5c8e2012-11-02 16:16:26 +01001474static void scrub_recheck_block(struct btrfs_fs_info *fs_info,
Zhao Leiaffe4a52015-08-24 21:32:06 +08001475 struct scrub_block *sblock,
1476 int retry_failed_mirror)
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001477{
1478 int page_num;
1479
1480 sblock->no_io_error_seen = 1;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001481
1482 for (page_num = 0; page_num < sblock->page_count; page_num++) {
1483 struct bio *bio;
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001484 struct scrub_page *page = sblock->pagev[page_num];
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001485
Stefan Behrens442a4f62012-05-25 16:06:08 +02001486 if (page->dev->bdev == NULL) {
Stefan Behrensea9947b2012-05-04 15:16:07 -04001487 page->io_error = 1;
1488 sblock->no_io_error_seen = 0;
1489 continue;
1490 }
1491
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001492 WARN_ON(!page->page);
Chris Mason9be33952013-05-17 18:30:14 -04001493 bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
Stefan Behrens34f5c8e2012-11-02 16:16:26 +01001494 if (!bio) {
1495 page->io_error = 1;
1496 sblock->no_io_error_seen = 0;
1497 continue;
1498 }
Stefan Behrens442a4f62012-05-25 16:06:08 +02001499 bio->bi_bdev = page->dev->bdev;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001500
Stefan Behrens34f5c8e2012-11-02 16:16:26 +01001501 bio_add_page(bio, page->page, PAGE_SIZE, 0);
Miao Xieaf8e2d12014-10-23 14:42:50 +08001502 if (!retry_failed_mirror && scrub_is_page_on_raid56(page)) {
1503 if (scrub_submit_raid56_bio_wait(fs_info, bio, page))
1504 sblock->no_io_error_seen = 0;
1505 } else {
1506 bio->bi_iter.bi_sector = page->physical >> 9;
1507
1508 if (btrfsic_submit_bio_wait(READ, bio))
1509 sblock->no_io_error_seen = 0;
1510 }
Kent Overstreet33879d42013-11-23 22:33:32 -08001511
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001512 bio_put(bio);
1513 }
1514
1515 if (sblock->no_io_error_seen)
Zhao Leiba7cf982015-08-24 21:18:02 +08001516 scrub_recheck_block_checksum(sblock);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001517
Stefan Behrens34f5c8e2012-11-02 16:16:26 +01001518 return;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001519}
1520
Miao Xie17a9be22014-07-24 11:37:08 +08001521static inline int scrub_check_fsid(u8 fsid[],
1522 struct scrub_page *spage)
1523{
1524 struct btrfs_fs_devices *fs_devices = spage->dev->fs_devices;
1525 int ret;
1526
1527 ret = memcmp(fsid, fs_devices->fsid, BTRFS_UUID_SIZE);
1528 return !ret;
1529}
1530
Zhao Leiba7cf982015-08-24 21:18:02 +08001531static void scrub_recheck_block_checksum(struct scrub_block *sblock)
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001532{
Zhao Leiba7cf982015-08-24 21:18:02 +08001533 sblock->header_error = 0;
1534 sblock->checksum_error = 0;
1535 sblock->generation_error = 0;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001536
Zhao Leiba7cf982015-08-24 21:18:02 +08001537 if (sblock->pagev[0]->flags & BTRFS_EXTENT_FLAG_DATA)
1538 scrub_checksum_data(sblock);
1539 else
1540 scrub_checksum_tree_block(sblock);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001541}
1542
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001543static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad,
Zhao Lei114ab502015-01-20 15:11:36 +08001544 struct scrub_block *sblock_good)
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001545{
1546 int page_num;
1547 int ret = 0;
1548
1549 for (page_num = 0; page_num < sblock_bad->page_count; page_num++) {
1550 int ret_sub;
1551
1552 ret_sub = scrub_repair_page_from_good_copy(sblock_bad,
1553 sblock_good,
Zhao Lei114ab502015-01-20 15:11:36 +08001554 page_num, 1);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001555 if (ret_sub)
1556 ret = ret_sub;
1557 }
1558
1559 return ret;
1560}
1561
1562static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad,
1563 struct scrub_block *sblock_good,
1564 int page_num, int force_write)
1565{
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001566 struct scrub_page *page_bad = sblock_bad->pagev[page_num];
1567 struct scrub_page *page_good = sblock_good->pagev[page_num];
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001568
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001569 BUG_ON(page_bad->page == NULL);
1570 BUG_ON(page_good->page == NULL);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001571 if (force_write || sblock_bad->header_error ||
1572 sblock_bad->checksum_error || page_bad->io_error) {
1573 struct bio *bio;
1574 int ret;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001575
Stefan Behrensff023aa2012-11-06 11:43:11 +01001576 if (!page_bad->dev->bdev) {
David Sterba94647322015-10-08 11:01:36 +02001577 btrfs_warn_rl(sblock_bad->sctx->dev_root->fs_info,
Frank Holtonefe120a2013-12-20 11:37:06 -05001578 "scrub_repair_page_from_good_copy(bdev == NULL) "
David Sterba94647322015-10-08 11:01:36 +02001579 "is unexpected");
Stefan Behrensff023aa2012-11-06 11:43:11 +01001580 return -EIO;
1581 }
1582
Chris Mason9be33952013-05-17 18:30:14 -04001583 bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
Tsutomu Itohe627ee72012-04-12 16:03:56 -04001584 if (!bio)
1585 return -EIO;
Stefan Behrens442a4f62012-05-25 16:06:08 +02001586 bio->bi_bdev = page_bad->dev->bdev;
Kent Overstreet4f024f32013-10-11 15:44:27 -07001587 bio->bi_iter.bi_sector = page_bad->physical >> 9;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001588
1589 ret = bio_add_page(bio, page_good->page, PAGE_SIZE, 0);
1590 if (PAGE_SIZE != ret) {
1591 bio_put(bio);
1592 return -EIO;
1593 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001594
Kent Overstreet33879d42013-11-23 22:33:32 -08001595 if (btrfsic_submit_bio_wait(WRITE, bio)) {
Stefan Behrens442a4f62012-05-25 16:06:08 +02001596 btrfs_dev_stat_inc_and_print(page_bad->dev,
1597 BTRFS_DEV_STAT_WRITE_ERRS);
Stefan Behrensff023aa2012-11-06 11:43:11 +01001598 btrfs_dev_replace_stats_inc(
1599 &sblock_bad->sctx->dev_root->fs_info->
1600 dev_replace.num_write_errors);
Stefan Behrens442a4f62012-05-25 16:06:08 +02001601 bio_put(bio);
1602 return -EIO;
1603 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001604 bio_put(bio);
1605 }
1606
1607 return 0;
1608}
1609
Stefan Behrensff023aa2012-11-06 11:43:11 +01001610static void scrub_write_block_to_dev_replace(struct scrub_block *sblock)
1611{
1612 int page_num;
1613
Miao Xie5a6ac9e2014-11-06 17:20:58 +08001614 /*
1615 * This block is used for the check of the parity on the source device,
1616 * so the data needn't be written into the destination device.
1617 */
1618 if (sblock->sparity)
1619 return;
1620
Stefan Behrensff023aa2012-11-06 11:43:11 +01001621 for (page_num = 0; page_num < sblock->page_count; page_num++) {
1622 int ret;
1623
1624 ret = scrub_write_page_to_dev_replace(sblock, page_num);
1625 if (ret)
1626 btrfs_dev_replace_stats_inc(
1627 &sblock->sctx->dev_root->fs_info->dev_replace.
1628 num_write_errors);
1629 }
1630}
1631
1632static int scrub_write_page_to_dev_replace(struct scrub_block *sblock,
1633 int page_num)
1634{
1635 struct scrub_page *spage = sblock->pagev[page_num];
1636
1637 BUG_ON(spage->page == NULL);
1638 if (spage->io_error) {
1639 void *mapped_buffer = kmap_atomic(spage->page);
1640
1641 memset(mapped_buffer, 0, PAGE_CACHE_SIZE);
1642 flush_dcache_page(spage->page);
1643 kunmap_atomic(mapped_buffer);
1644 }
1645 return scrub_add_page_to_wr_bio(sblock->sctx, spage);
1646}
1647
1648static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx,
1649 struct scrub_page *spage)
1650{
1651 struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx;
1652 struct scrub_bio *sbio;
1653 int ret;
1654
1655 mutex_lock(&wr_ctx->wr_lock);
1656again:
1657 if (!wr_ctx->wr_curr_bio) {
1658 wr_ctx->wr_curr_bio = kzalloc(sizeof(*wr_ctx->wr_curr_bio),
1659 GFP_NOFS);
1660 if (!wr_ctx->wr_curr_bio) {
1661 mutex_unlock(&wr_ctx->wr_lock);
1662 return -ENOMEM;
1663 }
1664 wr_ctx->wr_curr_bio->sctx = sctx;
1665 wr_ctx->wr_curr_bio->page_count = 0;
1666 }
1667 sbio = wr_ctx->wr_curr_bio;
1668 if (sbio->page_count == 0) {
1669 struct bio *bio;
1670
1671 sbio->physical = spage->physical_for_dev_replace;
1672 sbio->logical = spage->logical;
1673 sbio->dev = wr_ctx->tgtdev;
1674 bio = sbio->bio;
1675 if (!bio) {
Chris Mason9be33952013-05-17 18:30:14 -04001676 bio = btrfs_io_bio_alloc(GFP_NOFS, wr_ctx->pages_per_wr_bio);
Stefan Behrensff023aa2012-11-06 11:43:11 +01001677 if (!bio) {
1678 mutex_unlock(&wr_ctx->wr_lock);
1679 return -ENOMEM;
1680 }
1681 sbio->bio = bio;
1682 }
1683
1684 bio->bi_private = sbio;
1685 bio->bi_end_io = scrub_wr_bio_end_io;
1686 bio->bi_bdev = sbio->dev->bdev;
Kent Overstreet4f024f32013-10-11 15:44:27 -07001687 bio->bi_iter.bi_sector = sbio->physical >> 9;
Stefan Behrensff023aa2012-11-06 11:43:11 +01001688 sbio->err = 0;
1689 } else if (sbio->physical + sbio->page_count * PAGE_SIZE !=
1690 spage->physical_for_dev_replace ||
1691 sbio->logical + sbio->page_count * PAGE_SIZE !=
1692 spage->logical) {
1693 scrub_wr_submit(sctx);
1694 goto again;
1695 }
1696
1697 ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0);
1698 if (ret != PAGE_SIZE) {
1699 if (sbio->page_count < 1) {
1700 bio_put(sbio->bio);
1701 sbio->bio = NULL;
1702 mutex_unlock(&wr_ctx->wr_lock);
1703 return -EIO;
1704 }
1705 scrub_wr_submit(sctx);
1706 goto again;
1707 }
1708
1709 sbio->pagev[sbio->page_count] = spage;
1710 scrub_page_get(spage);
1711 sbio->page_count++;
1712 if (sbio->page_count == wr_ctx->pages_per_wr_bio)
1713 scrub_wr_submit(sctx);
1714 mutex_unlock(&wr_ctx->wr_lock);
1715
1716 return 0;
1717}
1718
1719static void scrub_wr_submit(struct scrub_ctx *sctx)
1720{
1721 struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx;
1722 struct scrub_bio *sbio;
1723
1724 if (!wr_ctx->wr_curr_bio)
1725 return;
1726
1727 sbio = wr_ctx->wr_curr_bio;
1728 wr_ctx->wr_curr_bio = NULL;
1729 WARN_ON(!sbio->bio->bi_bdev);
1730 scrub_pending_bio_inc(sctx);
1731 /* process all writes in a single worker thread. Then the block layer
1732 * orders the requests before sending them to the driver which
1733 * doubled the write performance on spinning disks when measured
1734 * with Linux 3.5 */
1735 btrfsic_submit_bio(WRITE, sbio->bio);
1736}
1737
Christoph Hellwig4246a0b2015-07-20 15:29:37 +02001738static void scrub_wr_bio_end_io(struct bio *bio)
Stefan Behrensff023aa2012-11-06 11:43:11 +01001739{
1740 struct scrub_bio *sbio = bio->bi_private;
1741 struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info;
1742
Christoph Hellwig4246a0b2015-07-20 15:29:37 +02001743 sbio->err = bio->bi_error;
Stefan Behrensff023aa2012-11-06 11:43:11 +01001744 sbio->bio = bio;
1745
Liu Bo9e0af232014-08-15 23:36:53 +08001746 btrfs_init_work(&sbio->work, btrfs_scrubwrc_helper,
1747 scrub_wr_bio_end_io_worker, NULL, NULL);
Qu Wenruo0339ef22014-02-28 10:46:17 +08001748 btrfs_queue_work(fs_info->scrub_wr_completion_workers, &sbio->work);
Stefan Behrensff023aa2012-11-06 11:43:11 +01001749}
1750
1751static void scrub_wr_bio_end_io_worker(struct btrfs_work *work)
1752{
1753 struct scrub_bio *sbio = container_of(work, struct scrub_bio, work);
1754 struct scrub_ctx *sctx = sbio->sctx;
1755 int i;
1756
1757 WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO);
1758 if (sbio->err) {
1759 struct btrfs_dev_replace *dev_replace =
1760 &sbio->sctx->dev_root->fs_info->dev_replace;
1761
1762 for (i = 0; i < sbio->page_count; i++) {
1763 struct scrub_page *spage = sbio->pagev[i];
1764
1765 spage->io_error = 1;
1766 btrfs_dev_replace_stats_inc(&dev_replace->
1767 num_write_errors);
1768 }
1769 }
1770
1771 for (i = 0; i < sbio->page_count; i++)
1772 scrub_page_put(sbio->pagev[i]);
1773
1774 bio_put(sbio->bio);
1775 kfree(sbio);
1776 scrub_pending_bio_dec(sctx);
1777}
1778
1779static int scrub_checksum(struct scrub_block *sblock)
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001780{
1781 u64 flags;
1782 int ret;
1783
Zhao Leiba7cf982015-08-24 21:18:02 +08001784 /*
1785 * No need to initialize these stats currently,
1786 * because this function only use return value
1787 * instead of these stats value.
1788 *
1789 * Todo:
1790 * always use stats
1791 */
1792 sblock->header_error = 0;
1793 sblock->generation_error = 0;
1794 sblock->checksum_error = 0;
1795
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001796 WARN_ON(sblock->page_count < 1);
1797 flags = sblock->pagev[0]->flags;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001798 ret = 0;
1799 if (flags & BTRFS_EXTENT_FLAG_DATA)
1800 ret = scrub_checksum_data(sblock);
1801 else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)
1802 ret = scrub_checksum_tree_block(sblock);
1803 else if (flags & BTRFS_EXTENT_FLAG_SUPER)
1804 (void)scrub_checksum_super(sblock);
1805 else
1806 WARN_ON(1);
1807 if (ret)
1808 scrub_handle_errored_block(sblock);
Stefan Behrensff023aa2012-11-06 11:43:11 +01001809
1810 return ret;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001811}
1812
1813static int scrub_checksum_data(struct scrub_block *sblock)
1814{
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001815 struct scrub_ctx *sctx = sblock->sctx;
Arne Jansena2de7332011-03-08 14:14:00 +01001816 u8 csum[BTRFS_CSUM_SIZE];
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001817 u8 *on_disk_csum;
1818 struct page *page;
1819 void *buffer;
Arne Jansena2de7332011-03-08 14:14:00 +01001820 u32 crc = ~(u32)0;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001821 u64 len;
1822 int index;
Arne Jansena2de7332011-03-08 14:14:00 +01001823
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001824 BUG_ON(sblock->page_count < 1);
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001825 if (!sblock->pagev[0]->have_csum)
Arne Jansena2de7332011-03-08 14:14:00 +01001826 return 0;
1827
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001828 on_disk_csum = sblock->pagev[0]->csum;
1829 page = sblock->pagev[0]->page;
Linus Torvalds9613beb2012-03-30 12:44:29 -07001830 buffer = kmap_atomic(page);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001831
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001832 len = sctx->sectorsize;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001833 index = 0;
1834 for (;;) {
1835 u64 l = min_t(u64, len, PAGE_SIZE);
1836
Liu Bob0496682013-03-14 14:57:45 +00001837 crc = btrfs_csum_data(buffer, crc, l);
Linus Torvalds9613beb2012-03-30 12:44:29 -07001838 kunmap_atomic(buffer);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001839 len -= l;
1840 if (len == 0)
1841 break;
1842 index++;
1843 BUG_ON(index >= sblock->page_count);
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001844 BUG_ON(!sblock->pagev[index]->page);
1845 page = sblock->pagev[index]->page;
Linus Torvalds9613beb2012-03-30 12:44:29 -07001846 buffer = kmap_atomic(page);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001847 }
1848
Arne Jansena2de7332011-03-08 14:14:00 +01001849 btrfs_csum_final(crc, csum);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001850 if (memcmp(csum, on_disk_csum, sctx->csum_size))
Zhao Leiba7cf982015-08-24 21:18:02 +08001851 sblock->checksum_error = 1;
Arne Jansena2de7332011-03-08 14:14:00 +01001852
Zhao Leiba7cf982015-08-24 21:18:02 +08001853 return sblock->checksum_error;
Arne Jansena2de7332011-03-08 14:14:00 +01001854}
1855
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001856static int scrub_checksum_tree_block(struct scrub_block *sblock)
Arne Jansena2de7332011-03-08 14:14:00 +01001857{
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001858 struct scrub_ctx *sctx = sblock->sctx;
Arne Jansena2de7332011-03-08 14:14:00 +01001859 struct btrfs_header *h;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01001860 struct btrfs_root *root = sctx->dev_root;
Arne Jansena2de7332011-03-08 14:14:00 +01001861 struct btrfs_fs_info *fs_info = root->fs_info;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001862 u8 calculated_csum[BTRFS_CSUM_SIZE];
1863 u8 on_disk_csum[BTRFS_CSUM_SIZE];
1864 struct page *page;
1865 void *mapped_buffer;
1866 u64 mapped_size;
1867 void *p;
Arne Jansena2de7332011-03-08 14:14:00 +01001868 u32 crc = ~(u32)0;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001869 u64 len;
1870 int index;
1871
1872 BUG_ON(sblock->page_count < 1);
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001873 page = sblock->pagev[0]->page;
Linus Torvalds9613beb2012-03-30 12:44:29 -07001874 mapped_buffer = kmap_atomic(page);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001875 h = (struct btrfs_header *)mapped_buffer;
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001876 memcpy(on_disk_csum, h->csum, sctx->csum_size);
Arne Jansena2de7332011-03-08 14:14:00 +01001877
1878 /*
1879 * we don't use the getter functions here, as we
1880 * a) don't have an extent buffer and
1881 * b) the page is already kmapped
1882 */
Qu Wenruo3cae2102013-07-16 11:19:18 +08001883 if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h))
Zhao Leiba7cf982015-08-24 21:18:02 +08001884 sblock->header_error = 1;
Arne Jansena2de7332011-03-08 14:14:00 +01001885
Zhao Leiba7cf982015-08-24 21:18:02 +08001886 if (sblock->pagev[0]->generation != btrfs_stack_header_generation(h)) {
1887 sblock->header_error = 1;
1888 sblock->generation_error = 1;
1889 }
Arne Jansena2de7332011-03-08 14:14:00 +01001890
Miao Xie17a9be22014-07-24 11:37:08 +08001891 if (!scrub_check_fsid(h->fsid, sblock->pagev[0]))
Zhao Leiba7cf982015-08-24 21:18:02 +08001892 sblock->header_error = 1;
Arne Jansena2de7332011-03-08 14:14:00 +01001893
1894 if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid,
1895 BTRFS_UUID_SIZE))
Zhao Leiba7cf982015-08-24 21:18:02 +08001896 sblock->header_error = 1;
Arne Jansena2de7332011-03-08 14:14:00 +01001897
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001898 len = sctx->nodesize - BTRFS_CSUM_SIZE;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001899 mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE;
1900 p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE;
1901 index = 0;
1902 for (;;) {
1903 u64 l = min_t(u64, len, mapped_size);
1904
Liu Bob0496682013-03-14 14:57:45 +00001905 crc = btrfs_csum_data(p, crc, l);
Linus Torvalds9613beb2012-03-30 12:44:29 -07001906 kunmap_atomic(mapped_buffer);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001907 len -= l;
1908 if (len == 0)
1909 break;
1910 index++;
1911 BUG_ON(index >= sblock->page_count);
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001912 BUG_ON(!sblock->pagev[index]->page);
1913 page = sblock->pagev[index]->page;
Linus Torvalds9613beb2012-03-30 12:44:29 -07001914 mapped_buffer = kmap_atomic(page);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001915 mapped_size = PAGE_SIZE;
1916 p = mapped_buffer;
1917 }
1918
1919 btrfs_csum_final(crc, calculated_csum);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001920 if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size))
Zhao Leiba7cf982015-08-24 21:18:02 +08001921 sblock->checksum_error = 1;
Arne Jansena2de7332011-03-08 14:14:00 +01001922
Zhao Leiba7cf982015-08-24 21:18:02 +08001923 return sblock->header_error || sblock->checksum_error;
Arne Jansena2de7332011-03-08 14:14:00 +01001924}
1925
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001926static int scrub_checksum_super(struct scrub_block *sblock)
Arne Jansena2de7332011-03-08 14:14:00 +01001927{
1928 struct btrfs_super_block *s;
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001929 struct scrub_ctx *sctx = sblock->sctx;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001930 u8 calculated_csum[BTRFS_CSUM_SIZE];
1931 u8 on_disk_csum[BTRFS_CSUM_SIZE];
1932 struct page *page;
1933 void *mapped_buffer;
1934 u64 mapped_size;
1935 void *p;
Arne Jansena2de7332011-03-08 14:14:00 +01001936 u32 crc = ~(u32)0;
Stefan Behrens442a4f62012-05-25 16:06:08 +02001937 int fail_gen = 0;
1938 int fail_cor = 0;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001939 u64 len;
1940 int index;
Arne Jansena2de7332011-03-08 14:14:00 +01001941
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001942 BUG_ON(sblock->page_count < 1);
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001943 page = sblock->pagev[0]->page;
Linus Torvalds9613beb2012-03-30 12:44:29 -07001944 mapped_buffer = kmap_atomic(page);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001945 s = (struct btrfs_super_block *)mapped_buffer;
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001946 memcpy(on_disk_csum, s->csum, sctx->csum_size);
Arne Jansena2de7332011-03-08 14:14:00 +01001947
Qu Wenruo3cae2102013-07-16 11:19:18 +08001948 if (sblock->pagev[0]->logical != btrfs_super_bytenr(s))
Stefan Behrens442a4f62012-05-25 16:06:08 +02001949 ++fail_cor;
Arne Jansena2de7332011-03-08 14:14:00 +01001950
Qu Wenruo3cae2102013-07-16 11:19:18 +08001951 if (sblock->pagev[0]->generation != btrfs_super_generation(s))
Stefan Behrens442a4f62012-05-25 16:06:08 +02001952 ++fail_gen;
Arne Jansena2de7332011-03-08 14:14:00 +01001953
Miao Xie17a9be22014-07-24 11:37:08 +08001954 if (!scrub_check_fsid(s->fsid, sblock->pagev[0]))
Stefan Behrens442a4f62012-05-25 16:06:08 +02001955 ++fail_cor;
Arne Jansena2de7332011-03-08 14:14:00 +01001956
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001957 len = BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE;
1958 mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE;
1959 p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE;
1960 index = 0;
1961 for (;;) {
1962 u64 l = min_t(u64, len, mapped_size);
1963
Liu Bob0496682013-03-14 14:57:45 +00001964 crc = btrfs_csum_data(p, crc, l);
Linus Torvalds9613beb2012-03-30 12:44:29 -07001965 kunmap_atomic(mapped_buffer);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001966 len -= l;
1967 if (len == 0)
1968 break;
1969 index++;
1970 BUG_ON(index >= sblock->page_count);
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001971 BUG_ON(!sblock->pagev[index]->page);
1972 page = sblock->pagev[index]->page;
Linus Torvalds9613beb2012-03-30 12:44:29 -07001973 mapped_buffer = kmap_atomic(page);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001974 mapped_size = PAGE_SIZE;
1975 p = mapped_buffer;
1976 }
1977
1978 btrfs_csum_final(crc, calculated_csum);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001979 if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size))
Stefan Behrens442a4f62012-05-25 16:06:08 +02001980 ++fail_cor;
Arne Jansena2de7332011-03-08 14:14:00 +01001981
Stefan Behrens442a4f62012-05-25 16:06:08 +02001982 if (fail_cor + fail_gen) {
Arne Jansena2de7332011-03-08 14:14:00 +01001983 /*
1984 * if we find an error in a super block, we just report it.
1985 * They will get written with the next transaction commit
1986 * anyway
1987 */
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001988 spin_lock(&sctx->stat_lock);
1989 ++sctx->stat.super_errors;
1990 spin_unlock(&sctx->stat_lock);
Stefan Behrens442a4f62012-05-25 16:06:08 +02001991 if (fail_cor)
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001992 btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev,
Stefan Behrens442a4f62012-05-25 16:06:08 +02001993 BTRFS_DEV_STAT_CORRUPTION_ERRS);
1994 else
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001995 btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev,
Stefan Behrens442a4f62012-05-25 16:06:08 +02001996 BTRFS_DEV_STAT_GENERATION_ERRS);
Arne Jansena2de7332011-03-08 14:14:00 +01001997 }
1998
Stefan Behrens442a4f62012-05-25 16:06:08 +02001999 return fail_cor + fail_gen;
Arne Jansena2de7332011-03-08 14:14:00 +01002000}
2001
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002002static void scrub_block_get(struct scrub_block *sblock)
2003{
Zhao Lei57019342015-01-20 15:11:45 +08002004 atomic_inc(&sblock->refs);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002005}
2006
2007static void scrub_block_put(struct scrub_block *sblock)
2008{
Zhao Lei57019342015-01-20 15:11:45 +08002009 if (atomic_dec_and_test(&sblock->refs)) {
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002010 int i;
2011
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002012 if (sblock->sparity)
2013 scrub_parity_put(sblock->sparity);
2014
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002015 for (i = 0; i < sblock->page_count; i++)
Stefan Behrens7a9e9982012-11-02 14:58:04 +01002016 scrub_page_put(sblock->pagev[i]);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002017 kfree(sblock);
2018 }
2019}
2020
Stefan Behrens7a9e9982012-11-02 14:58:04 +01002021static void scrub_page_get(struct scrub_page *spage)
2022{
Zhao Lei57019342015-01-20 15:11:45 +08002023 atomic_inc(&spage->refs);
Stefan Behrens7a9e9982012-11-02 14:58:04 +01002024}
2025
2026static void scrub_page_put(struct scrub_page *spage)
2027{
Zhao Lei57019342015-01-20 15:11:45 +08002028 if (atomic_dec_and_test(&spage->refs)) {
Stefan Behrens7a9e9982012-11-02 14:58:04 +01002029 if (spage->page)
2030 __free_page(spage->page);
2031 kfree(spage);
2032 }
2033}
2034
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002035static void scrub_submit(struct scrub_ctx *sctx)
Arne Jansena2de7332011-03-08 14:14:00 +01002036{
2037 struct scrub_bio *sbio;
2038
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002039 if (sctx->curr == -1)
Stefan Behrens1623ede2012-03-27 14:21:26 -04002040 return;
Arne Jansena2de7332011-03-08 14:14:00 +01002041
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002042 sbio = sctx->bios[sctx->curr];
2043 sctx->curr = -1;
Stefan Behrensb6bfebc2012-11-02 16:44:58 +01002044 scrub_pending_bio_inc(sctx);
Omar Sandoval03679ad2015-06-19 11:52:48 -07002045 btrfsic_submit_bio(READ, sbio->bio);
Arne Jansena2de7332011-03-08 14:14:00 +01002046}
2047
Stefan Behrensff023aa2012-11-06 11:43:11 +01002048static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx,
2049 struct scrub_page *spage)
Arne Jansena2de7332011-03-08 14:14:00 +01002050{
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002051 struct scrub_block *sblock = spage->sblock;
Arne Jansena2de7332011-03-08 14:14:00 +01002052 struct scrub_bio *sbio;
Arne Jansen69f4cb52011-11-11 08:17:10 -05002053 int ret;
Arne Jansena2de7332011-03-08 14:14:00 +01002054
2055again:
2056 /*
2057 * grab a fresh bio or wait for one to become available
2058 */
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002059 while (sctx->curr == -1) {
2060 spin_lock(&sctx->list_lock);
2061 sctx->curr = sctx->first_free;
2062 if (sctx->curr != -1) {
2063 sctx->first_free = sctx->bios[sctx->curr]->next_free;
2064 sctx->bios[sctx->curr]->next_free = -1;
2065 sctx->bios[sctx->curr]->page_count = 0;
2066 spin_unlock(&sctx->list_lock);
Arne Jansena2de7332011-03-08 14:14:00 +01002067 } else {
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002068 spin_unlock(&sctx->list_lock);
2069 wait_event(sctx->list_wait, sctx->first_free != -1);
Arne Jansena2de7332011-03-08 14:14:00 +01002070 }
2071 }
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002072 sbio = sctx->bios[sctx->curr];
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002073 if (sbio->page_count == 0) {
Arne Jansen69f4cb52011-11-11 08:17:10 -05002074 struct bio *bio;
2075
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002076 sbio->physical = spage->physical;
2077 sbio->logical = spage->logical;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002078 sbio->dev = spage->dev;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002079 bio = sbio->bio;
2080 if (!bio) {
Chris Mason9be33952013-05-17 18:30:14 -04002081 bio = btrfs_io_bio_alloc(GFP_NOFS, sctx->pages_per_rd_bio);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002082 if (!bio)
2083 return -ENOMEM;
2084 sbio->bio = bio;
2085 }
Arne Jansen69f4cb52011-11-11 08:17:10 -05002086
2087 bio->bi_private = sbio;
2088 bio->bi_end_io = scrub_bio_end_io;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002089 bio->bi_bdev = sbio->dev->bdev;
Kent Overstreet4f024f32013-10-11 15:44:27 -07002090 bio->bi_iter.bi_sector = sbio->physical >> 9;
Arne Jansen69f4cb52011-11-11 08:17:10 -05002091 sbio->err = 0;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002092 } else if (sbio->physical + sbio->page_count * PAGE_SIZE !=
2093 spage->physical ||
2094 sbio->logical + sbio->page_count * PAGE_SIZE !=
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002095 spage->logical ||
2096 sbio->dev != spage->dev) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002097 scrub_submit(sctx);
Arne Jansen69f4cb52011-11-11 08:17:10 -05002098 goto again;
2099 }
2100
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002101 sbio->pagev[sbio->page_count] = spage;
2102 ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0);
2103 if (ret != PAGE_SIZE) {
2104 if (sbio->page_count < 1) {
2105 bio_put(sbio->bio);
2106 sbio->bio = NULL;
2107 return -EIO;
2108 }
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002109 scrub_submit(sctx);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002110 goto again;
Arne Jansena2de7332011-03-08 14:14:00 +01002111 }
Arne Jansen1bc87792011-05-28 21:57:55 +02002112
Stefan Behrensff023aa2012-11-06 11:43:11 +01002113 scrub_block_get(sblock); /* one for the page added to the bio */
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002114 atomic_inc(&sblock->outstanding_pages);
2115 sbio->page_count++;
Stefan Behrensff023aa2012-11-06 11:43:11 +01002116 if (sbio->page_count == sctx->pages_per_rd_bio)
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002117 scrub_submit(sctx);
Arne Jansena2de7332011-03-08 14:14:00 +01002118
2119 return 0;
2120}
2121
Linus Torvalds22365972015-09-05 15:14:43 -07002122static void scrub_missing_raid56_end_io(struct bio *bio)
Omar Sandoval73ff61d2015-06-19 11:52:51 -07002123{
2124 struct scrub_block *sblock = bio->bi_private;
2125 struct btrfs_fs_info *fs_info = sblock->sctx->dev_root->fs_info;
2126
Linus Torvalds22365972015-09-05 15:14:43 -07002127 if (bio->bi_error)
Omar Sandoval73ff61d2015-06-19 11:52:51 -07002128 sblock->no_io_error_seen = 0;
2129
2130 btrfs_queue_work(fs_info->scrub_workers, &sblock->work);
2131}
2132
2133static void scrub_missing_raid56_worker(struct btrfs_work *work)
2134{
2135 struct scrub_block *sblock = container_of(work, struct scrub_block, work);
2136 struct scrub_ctx *sctx = sblock->sctx;
Omar Sandoval73ff61d2015-06-19 11:52:51 -07002137 u64 logical;
2138 struct btrfs_device *dev;
2139
Omar Sandoval73ff61d2015-06-19 11:52:51 -07002140 logical = sblock->pagev[0]->logical;
2141 dev = sblock->pagev[0]->dev;
2142
Zhao Leiaffe4a52015-08-24 21:32:06 +08002143 if (sblock->no_io_error_seen)
Zhao Leiba7cf982015-08-24 21:18:02 +08002144 scrub_recheck_block_checksum(sblock);
Omar Sandoval73ff61d2015-06-19 11:52:51 -07002145
2146 if (!sblock->no_io_error_seen) {
2147 spin_lock(&sctx->stat_lock);
2148 sctx->stat.read_errors++;
2149 spin_unlock(&sctx->stat_lock);
Zhao Leiba7cf982015-08-24 21:18:02 +08002150 btrfs_err_rl_in_rcu(sctx->dev_root->fs_info,
David Sterbab14af3b2015-10-08 10:43:10 +02002151 "IO error rebuilding logical %llu for dev %s",
Omar Sandoval73ff61d2015-06-19 11:52:51 -07002152 logical, rcu_str_deref(dev->name));
2153 } else if (sblock->header_error || sblock->checksum_error) {
2154 spin_lock(&sctx->stat_lock);
2155 sctx->stat.uncorrectable_errors++;
2156 spin_unlock(&sctx->stat_lock);
Zhao Leiba7cf982015-08-24 21:18:02 +08002157 btrfs_err_rl_in_rcu(sctx->dev_root->fs_info,
David Sterbab14af3b2015-10-08 10:43:10 +02002158 "failed to rebuild valid logical %llu for dev %s",
Omar Sandoval73ff61d2015-06-19 11:52:51 -07002159 logical, rcu_str_deref(dev->name));
2160 } else {
2161 scrub_write_block_to_dev_replace(sblock);
2162 }
2163
2164 scrub_block_put(sblock);
2165
2166 if (sctx->is_dev_replace &&
2167 atomic_read(&sctx->wr_ctx.flush_all_writes)) {
2168 mutex_lock(&sctx->wr_ctx.wr_lock);
2169 scrub_wr_submit(sctx);
2170 mutex_unlock(&sctx->wr_ctx.wr_lock);
2171 }
2172
2173 scrub_pending_bio_dec(sctx);
2174}
2175
2176static void scrub_missing_raid56_pages(struct scrub_block *sblock)
2177{
2178 struct scrub_ctx *sctx = sblock->sctx;
2179 struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
2180 u64 length = sblock->page_count * PAGE_SIZE;
2181 u64 logical = sblock->pagev[0]->logical;
2182 struct btrfs_bio *bbio;
2183 struct bio *bio;
2184 struct btrfs_raid_bio *rbio;
2185 int ret;
2186 int i;
2187
2188 ret = btrfs_map_sblock(fs_info, REQ_GET_READ_MIRRORS, logical, &length,
2189 &bbio, 0, 1);
2190 if (ret || !bbio || !bbio->raid_map)
2191 goto bbio_out;
2192
2193 if (WARN_ON(!sctx->is_dev_replace ||
2194 !(bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK))) {
2195 /*
2196 * We shouldn't be scrubbing a missing device. Even for dev
2197 * replace, we should only get here for RAID 5/6. We either
2198 * managed to mount something with no mirrors remaining or
2199 * there's a bug in scrub_remap_extent()/btrfs_map_block().
2200 */
2201 goto bbio_out;
2202 }
2203
2204 bio = btrfs_io_bio_alloc(GFP_NOFS, 0);
2205 if (!bio)
2206 goto bbio_out;
2207
2208 bio->bi_iter.bi_sector = logical >> 9;
2209 bio->bi_private = sblock;
2210 bio->bi_end_io = scrub_missing_raid56_end_io;
2211
2212 rbio = raid56_alloc_missing_rbio(sctx->dev_root, bio, bbio, length);
2213 if (!rbio)
2214 goto rbio_out;
2215
2216 for (i = 0; i < sblock->page_count; i++) {
2217 struct scrub_page *spage = sblock->pagev[i];
2218
2219 raid56_add_scrub_pages(rbio, spage->page, spage->logical);
2220 }
2221
2222 btrfs_init_work(&sblock->work, btrfs_scrub_helper,
2223 scrub_missing_raid56_worker, NULL, NULL);
2224 scrub_block_get(sblock);
2225 scrub_pending_bio_inc(sctx);
2226 raid56_submit_missing_rbio(rbio);
2227 return;
2228
2229rbio_out:
2230 bio_put(bio);
2231bbio_out:
2232 btrfs_put_bbio(bbio);
2233 spin_lock(&sctx->stat_lock);
2234 sctx->stat.malloc_errors++;
2235 spin_unlock(&sctx->stat_lock);
2236}
2237
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002238static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002239 u64 physical, struct btrfs_device *dev, u64 flags,
Stefan Behrensff023aa2012-11-06 11:43:11 +01002240 u64 gen, int mirror_num, u8 *csum, int force,
2241 u64 physical_for_dev_replace)
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002242{
2243 struct scrub_block *sblock;
2244 int index;
2245
2246 sblock = kzalloc(sizeof(*sblock), GFP_NOFS);
2247 if (!sblock) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002248 spin_lock(&sctx->stat_lock);
2249 sctx->stat.malloc_errors++;
2250 spin_unlock(&sctx->stat_lock);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002251 return -ENOMEM;
2252 }
2253
Stefan Behrens7a9e9982012-11-02 14:58:04 +01002254 /* one ref inside this function, plus one for each page added to
2255 * a bio later on */
Zhao Lei57019342015-01-20 15:11:45 +08002256 atomic_set(&sblock->refs, 1);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002257 sblock->sctx = sctx;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002258 sblock->no_io_error_seen = 1;
2259
2260 for (index = 0; len > 0; index++) {
Stefan Behrens7a9e9982012-11-02 14:58:04 +01002261 struct scrub_page *spage;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002262 u64 l = min_t(u64, len, PAGE_SIZE);
2263
Stefan Behrens7a9e9982012-11-02 14:58:04 +01002264 spage = kzalloc(sizeof(*spage), GFP_NOFS);
2265 if (!spage) {
2266leave_nomem:
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002267 spin_lock(&sctx->stat_lock);
2268 sctx->stat.malloc_errors++;
2269 spin_unlock(&sctx->stat_lock);
Stefan Behrens7a9e9982012-11-02 14:58:04 +01002270 scrub_block_put(sblock);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002271 return -ENOMEM;
2272 }
Stefan Behrens7a9e9982012-11-02 14:58:04 +01002273 BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK);
2274 scrub_page_get(spage);
2275 sblock->pagev[index] = spage;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002276 spage->sblock = sblock;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002277 spage->dev = dev;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002278 spage->flags = flags;
2279 spage->generation = gen;
2280 spage->logical = logical;
2281 spage->physical = physical;
Stefan Behrensff023aa2012-11-06 11:43:11 +01002282 spage->physical_for_dev_replace = physical_for_dev_replace;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002283 spage->mirror_num = mirror_num;
2284 if (csum) {
2285 spage->have_csum = 1;
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002286 memcpy(spage->csum, csum, sctx->csum_size);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002287 } else {
2288 spage->have_csum = 0;
2289 }
2290 sblock->page_count++;
Stefan Behrens7a9e9982012-11-02 14:58:04 +01002291 spage->page = alloc_page(GFP_NOFS);
2292 if (!spage->page)
2293 goto leave_nomem;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002294 len -= l;
2295 logical += l;
2296 physical += l;
Stefan Behrensff023aa2012-11-06 11:43:11 +01002297 physical_for_dev_replace += l;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002298 }
2299
Stefan Behrens7a9e9982012-11-02 14:58:04 +01002300 WARN_ON(sblock->page_count == 0);
Omar Sandoval73ff61d2015-06-19 11:52:51 -07002301 if (dev->missing) {
2302 /*
2303 * This case should only be hit for RAID 5/6 device replace. See
2304 * the comment in scrub_missing_raid56_pages() for details.
2305 */
2306 scrub_missing_raid56_pages(sblock);
2307 } else {
2308 for (index = 0; index < sblock->page_count; index++) {
2309 struct scrub_page *spage = sblock->pagev[index];
2310 int ret;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002311
Omar Sandoval73ff61d2015-06-19 11:52:51 -07002312 ret = scrub_add_page_to_rd_bio(sctx, spage);
2313 if (ret) {
2314 scrub_block_put(sblock);
2315 return ret;
2316 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002317 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002318
Omar Sandoval73ff61d2015-06-19 11:52:51 -07002319 if (force)
2320 scrub_submit(sctx);
2321 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002322
2323 /* last one frees, either here or in bio completion for last page */
2324 scrub_block_put(sblock);
2325 return 0;
2326}
2327
Christoph Hellwig4246a0b2015-07-20 15:29:37 +02002328static void scrub_bio_end_io(struct bio *bio)
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002329{
2330 struct scrub_bio *sbio = bio->bi_private;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002331 struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002332
Christoph Hellwig4246a0b2015-07-20 15:29:37 +02002333 sbio->err = bio->bi_error;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002334 sbio->bio = bio;
2335
Qu Wenruo0339ef22014-02-28 10:46:17 +08002336 btrfs_queue_work(fs_info->scrub_workers, &sbio->work);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002337}
2338
2339static void scrub_bio_end_io_worker(struct btrfs_work *work)
2340{
2341 struct scrub_bio *sbio = container_of(work, struct scrub_bio, work);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002342 struct scrub_ctx *sctx = sbio->sctx;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002343 int i;
2344
Stefan Behrensff023aa2012-11-06 11:43:11 +01002345 BUG_ON(sbio->page_count > SCRUB_PAGES_PER_RD_BIO);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002346 if (sbio->err) {
2347 for (i = 0; i < sbio->page_count; i++) {
2348 struct scrub_page *spage = sbio->pagev[i];
2349
2350 spage->io_error = 1;
2351 spage->sblock->no_io_error_seen = 0;
2352 }
2353 }
2354
2355 /* now complete the scrub_block items that have all pages completed */
2356 for (i = 0; i < sbio->page_count; i++) {
2357 struct scrub_page *spage = sbio->pagev[i];
2358 struct scrub_block *sblock = spage->sblock;
2359
2360 if (atomic_dec_and_test(&sblock->outstanding_pages))
2361 scrub_block_complete(sblock);
2362 scrub_block_put(sblock);
2363 }
2364
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002365 bio_put(sbio->bio);
2366 sbio->bio = NULL;
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002367 spin_lock(&sctx->list_lock);
2368 sbio->next_free = sctx->first_free;
2369 sctx->first_free = sbio->index;
2370 spin_unlock(&sctx->list_lock);
Stefan Behrensff023aa2012-11-06 11:43:11 +01002371
2372 if (sctx->is_dev_replace &&
2373 atomic_read(&sctx->wr_ctx.flush_all_writes)) {
2374 mutex_lock(&sctx->wr_ctx.wr_lock);
2375 scrub_wr_submit(sctx);
2376 mutex_unlock(&sctx->wr_ctx.wr_lock);
2377 }
2378
Stefan Behrensb6bfebc2012-11-02 16:44:58 +01002379 scrub_pending_bio_dec(sctx);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002380}
2381
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002382static inline void __scrub_mark_bitmap(struct scrub_parity *sparity,
2383 unsigned long *bitmap,
2384 u64 start, u64 len)
2385{
David Sterba9d644a62015-02-20 18:42:11 +01002386 u32 offset;
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002387 int nsectors;
2388 int sectorsize = sparity->sctx->dev_root->sectorsize;
2389
2390 if (len >= sparity->stripe_len) {
2391 bitmap_set(bitmap, 0, sparity->nsectors);
2392 return;
2393 }
2394
2395 start -= sparity->logic_start;
David Sterba47c57132015-02-20 18:43:47 +01002396 start = div_u64_rem(start, sparity->stripe_len, &offset);
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002397 offset /= sectorsize;
2398 nsectors = (int)len / sectorsize;
2399
2400 if (offset + nsectors <= sparity->nsectors) {
2401 bitmap_set(bitmap, offset, nsectors);
2402 return;
2403 }
2404
2405 bitmap_set(bitmap, offset, sparity->nsectors - offset);
2406 bitmap_set(bitmap, 0, nsectors - (sparity->nsectors - offset));
2407}
2408
2409static inline void scrub_parity_mark_sectors_error(struct scrub_parity *sparity,
2410 u64 start, u64 len)
2411{
2412 __scrub_mark_bitmap(sparity, sparity->ebitmap, start, len);
2413}
2414
2415static inline void scrub_parity_mark_sectors_data(struct scrub_parity *sparity,
2416 u64 start, u64 len)
2417{
2418 __scrub_mark_bitmap(sparity, sparity->dbitmap, start, len);
2419}
2420
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002421static void scrub_block_complete(struct scrub_block *sblock)
2422{
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002423 int corrupted = 0;
2424
Stefan Behrensff023aa2012-11-06 11:43:11 +01002425 if (!sblock->no_io_error_seen) {
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002426 corrupted = 1;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002427 scrub_handle_errored_block(sblock);
Stefan Behrensff023aa2012-11-06 11:43:11 +01002428 } else {
2429 /*
2430 * if has checksum error, write via repair mechanism in
2431 * dev replace case, otherwise write here in dev replace
2432 * case.
2433 */
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002434 corrupted = scrub_checksum(sblock);
2435 if (!corrupted && sblock->sctx->is_dev_replace)
Stefan Behrensff023aa2012-11-06 11:43:11 +01002436 scrub_write_block_to_dev_replace(sblock);
2437 }
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002438
2439 if (sblock->sparity && corrupted && !sblock->data_corrected) {
2440 u64 start = sblock->pagev[0]->logical;
2441 u64 end = sblock->pagev[sblock->page_count - 1]->logical +
2442 PAGE_SIZE;
2443
2444 scrub_parity_mark_sectors_error(sblock->sparity,
2445 start, end - start);
2446 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002447}
2448
Zhao Lei3b5753e2015-08-24 22:03:02 +08002449static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u8 *csum)
Arne Jansena2de7332011-03-08 14:14:00 +01002450{
2451 struct btrfs_ordered_sum *sum = NULL;
Miao Xief51a4a12013-06-19 10:36:09 +08002452 unsigned long index;
Arne Jansena2de7332011-03-08 14:14:00 +01002453 unsigned long num_sectors;
Arne Jansena2de7332011-03-08 14:14:00 +01002454
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002455 while (!list_empty(&sctx->csum_list)) {
2456 sum = list_first_entry(&sctx->csum_list,
Arne Jansena2de7332011-03-08 14:14:00 +01002457 struct btrfs_ordered_sum, list);
2458 if (sum->bytenr > logical)
2459 return 0;
2460 if (sum->bytenr + sum->len > logical)
2461 break;
2462
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002463 ++sctx->stat.csum_discards;
Arne Jansena2de7332011-03-08 14:14:00 +01002464 list_del(&sum->list);
2465 kfree(sum);
2466 sum = NULL;
2467 }
2468 if (!sum)
2469 return 0;
2470
Miao Xief51a4a12013-06-19 10:36:09 +08002471 index = ((u32)(logical - sum->bytenr)) / sctx->sectorsize;
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002472 num_sectors = sum->len / sctx->sectorsize;
Miao Xief51a4a12013-06-19 10:36:09 +08002473 memcpy(csum, sum->sums + index, sctx->csum_size);
2474 if (index == num_sectors - 1) {
Arne Jansena2de7332011-03-08 14:14:00 +01002475 list_del(&sum->list);
2476 kfree(sum);
2477 }
Miao Xief51a4a12013-06-19 10:36:09 +08002478 return 1;
Arne Jansena2de7332011-03-08 14:14:00 +01002479}
2480
2481/* scrub extent tries to collect up to 64 kB for each bio */
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002482static int scrub_extent(struct scrub_ctx *sctx, u64 logical, u64 len,
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002483 u64 physical, struct btrfs_device *dev, u64 flags,
Stefan Behrensff023aa2012-11-06 11:43:11 +01002484 u64 gen, int mirror_num, u64 physical_for_dev_replace)
Arne Jansena2de7332011-03-08 14:14:00 +01002485{
2486 int ret;
2487 u8 csum[BTRFS_CSUM_SIZE];
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002488 u32 blocksize;
2489
2490 if (flags & BTRFS_EXTENT_FLAG_DATA) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002491 blocksize = sctx->sectorsize;
2492 spin_lock(&sctx->stat_lock);
2493 sctx->stat.data_extents_scrubbed++;
2494 sctx->stat.data_bytes_scrubbed += len;
2495 spin_unlock(&sctx->stat_lock);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002496 } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002497 blocksize = sctx->nodesize;
2498 spin_lock(&sctx->stat_lock);
2499 sctx->stat.tree_extents_scrubbed++;
2500 sctx->stat.tree_bytes_scrubbed += len;
2501 spin_unlock(&sctx->stat_lock);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002502 } else {
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002503 blocksize = sctx->sectorsize;
Stefan Behrensff023aa2012-11-06 11:43:11 +01002504 WARN_ON(1);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002505 }
Arne Jansena2de7332011-03-08 14:14:00 +01002506
2507 while (len) {
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002508 u64 l = min_t(u64, len, blocksize);
Arne Jansena2de7332011-03-08 14:14:00 +01002509 int have_csum = 0;
2510
2511 if (flags & BTRFS_EXTENT_FLAG_DATA) {
2512 /* push csums to sbio */
Zhao Lei3b5753e2015-08-24 22:03:02 +08002513 have_csum = scrub_find_csum(sctx, logical, csum);
Arne Jansena2de7332011-03-08 14:14:00 +01002514 if (have_csum == 0)
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002515 ++sctx->stat.no_csum;
Stefan Behrensff023aa2012-11-06 11:43:11 +01002516 if (sctx->is_dev_replace && !have_csum) {
2517 ret = copy_nocow_pages(sctx, logical, l,
2518 mirror_num,
2519 physical_for_dev_replace);
2520 goto behind_scrub_pages;
2521 }
Arne Jansena2de7332011-03-08 14:14:00 +01002522 }
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002523 ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen,
Stefan Behrensff023aa2012-11-06 11:43:11 +01002524 mirror_num, have_csum ? csum : NULL, 0,
2525 physical_for_dev_replace);
2526behind_scrub_pages:
Arne Jansena2de7332011-03-08 14:14:00 +01002527 if (ret)
2528 return ret;
2529 len -= l;
2530 logical += l;
2531 physical += l;
Stefan Behrensff023aa2012-11-06 11:43:11 +01002532 physical_for_dev_replace += l;
Arne Jansena2de7332011-03-08 14:14:00 +01002533 }
2534 return 0;
2535}
2536
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002537static int scrub_pages_for_parity(struct scrub_parity *sparity,
2538 u64 logical, u64 len,
2539 u64 physical, struct btrfs_device *dev,
2540 u64 flags, u64 gen, int mirror_num, u8 *csum)
2541{
2542 struct scrub_ctx *sctx = sparity->sctx;
2543 struct scrub_block *sblock;
2544 int index;
2545
2546 sblock = kzalloc(sizeof(*sblock), GFP_NOFS);
2547 if (!sblock) {
2548 spin_lock(&sctx->stat_lock);
2549 sctx->stat.malloc_errors++;
2550 spin_unlock(&sctx->stat_lock);
2551 return -ENOMEM;
2552 }
2553
2554 /* one ref inside this function, plus one for each page added to
2555 * a bio later on */
Zhao Lei57019342015-01-20 15:11:45 +08002556 atomic_set(&sblock->refs, 1);
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002557 sblock->sctx = sctx;
2558 sblock->no_io_error_seen = 1;
2559 sblock->sparity = sparity;
2560 scrub_parity_get(sparity);
2561
2562 for (index = 0; len > 0; index++) {
2563 struct scrub_page *spage;
2564 u64 l = min_t(u64, len, PAGE_SIZE);
2565
2566 spage = kzalloc(sizeof(*spage), GFP_NOFS);
2567 if (!spage) {
2568leave_nomem:
2569 spin_lock(&sctx->stat_lock);
2570 sctx->stat.malloc_errors++;
2571 spin_unlock(&sctx->stat_lock);
2572 scrub_block_put(sblock);
2573 return -ENOMEM;
2574 }
2575 BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK);
2576 /* For scrub block */
2577 scrub_page_get(spage);
2578 sblock->pagev[index] = spage;
2579 /* For scrub parity */
2580 scrub_page_get(spage);
2581 list_add_tail(&spage->list, &sparity->spages);
2582 spage->sblock = sblock;
2583 spage->dev = dev;
2584 spage->flags = flags;
2585 spage->generation = gen;
2586 spage->logical = logical;
2587 spage->physical = physical;
2588 spage->mirror_num = mirror_num;
2589 if (csum) {
2590 spage->have_csum = 1;
2591 memcpy(spage->csum, csum, sctx->csum_size);
2592 } else {
2593 spage->have_csum = 0;
2594 }
2595 sblock->page_count++;
2596 spage->page = alloc_page(GFP_NOFS);
2597 if (!spage->page)
2598 goto leave_nomem;
2599 len -= l;
2600 logical += l;
2601 physical += l;
2602 }
2603
2604 WARN_ON(sblock->page_count == 0);
2605 for (index = 0; index < sblock->page_count; index++) {
2606 struct scrub_page *spage = sblock->pagev[index];
2607 int ret;
2608
2609 ret = scrub_add_page_to_rd_bio(sctx, spage);
2610 if (ret) {
2611 scrub_block_put(sblock);
2612 return ret;
2613 }
2614 }
2615
2616 /* last one frees, either here or in bio completion for last page */
2617 scrub_block_put(sblock);
2618 return 0;
2619}
2620
2621static int scrub_extent_for_parity(struct scrub_parity *sparity,
2622 u64 logical, u64 len,
2623 u64 physical, struct btrfs_device *dev,
2624 u64 flags, u64 gen, int mirror_num)
2625{
2626 struct scrub_ctx *sctx = sparity->sctx;
2627 int ret;
2628 u8 csum[BTRFS_CSUM_SIZE];
2629 u32 blocksize;
2630
Omar Sandoval4a770892015-06-19 11:52:52 -07002631 if (dev->missing) {
2632 scrub_parity_mark_sectors_error(sparity, logical, len);
2633 return 0;
2634 }
2635
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002636 if (flags & BTRFS_EXTENT_FLAG_DATA) {
2637 blocksize = sctx->sectorsize;
2638 } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
2639 blocksize = sctx->nodesize;
2640 } else {
2641 blocksize = sctx->sectorsize;
2642 WARN_ON(1);
2643 }
2644
2645 while (len) {
2646 u64 l = min_t(u64, len, blocksize);
2647 int have_csum = 0;
2648
2649 if (flags & BTRFS_EXTENT_FLAG_DATA) {
2650 /* push csums to sbio */
Zhao Lei3b5753e2015-08-24 22:03:02 +08002651 have_csum = scrub_find_csum(sctx, logical, csum);
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002652 if (have_csum == 0)
2653 goto skip;
2654 }
2655 ret = scrub_pages_for_parity(sparity, logical, l, physical, dev,
2656 flags, gen, mirror_num,
2657 have_csum ? csum : NULL);
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002658 if (ret)
2659 return ret;
Dan Carpenter6b6d24b2014-12-12 22:30:00 +03002660skip:
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002661 len -= l;
2662 logical += l;
2663 physical += l;
2664 }
2665 return 0;
2666}
2667
Wang Shilong3b080b22014-04-01 18:01:43 +08002668/*
2669 * Given a physical address, this will calculate it's
2670 * logical offset. if this is a parity stripe, it will return
2671 * the most left data stripe's logical offset.
2672 *
2673 * return 0 if it is a data stripe, 1 means parity stripe.
2674 */
2675static int get_raid56_logic_offset(u64 physical, int num,
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002676 struct map_lookup *map, u64 *offset,
2677 u64 *stripe_start)
Wang Shilong3b080b22014-04-01 18:01:43 +08002678{
2679 int i;
2680 int j = 0;
2681 u64 stripe_nr;
2682 u64 last_offset;
David Sterba9d644a62015-02-20 18:42:11 +01002683 u32 stripe_index;
2684 u32 rot;
Wang Shilong3b080b22014-04-01 18:01:43 +08002685
2686 last_offset = (physical - map->stripes[num].physical) *
2687 nr_data_stripes(map);
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002688 if (stripe_start)
2689 *stripe_start = last_offset;
2690
Wang Shilong3b080b22014-04-01 18:01:43 +08002691 *offset = last_offset;
2692 for (i = 0; i < nr_data_stripes(map); i++) {
2693 *offset = last_offset + i * map->stripe_len;
2694
David Sterbab8b93ad2015-01-16 17:26:13 +01002695 stripe_nr = div_u64(*offset, map->stripe_len);
2696 stripe_nr = div_u64(stripe_nr, nr_data_stripes(map));
Wang Shilong3b080b22014-04-01 18:01:43 +08002697
2698 /* Work out the disk rotation on this stripe-set */
David Sterba47c57132015-02-20 18:43:47 +01002699 stripe_nr = div_u64_rem(stripe_nr, map->num_stripes, &rot);
Wang Shilong3b080b22014-04-01 18:01:43 +08002700 /* calculate which stripe this data locates */
2701 rot += i;
Wang Shilonge4fbaee2014-04-11 18:32:25 +08002702 stripe_index = rot % map->num_stripes;
Wang Shilong3b080b22014-04-01 18:01:43 +08002703 if (stripe_index == num)
2704 return 0;
2705 if (stripe_index < num)
2706 j++;
2707 }
2708 *offset = last_offset + j * map->stripe_len;
2709 return 1;
2710}
2711
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002712static void scrub_free_parity(struct scrub_parity *sparity)
2713{
2714 struct scrub_ctx *sctx = sparity->sctx;
2715 struct scrub_page *curr, *next;
2716 int nbits;
2717
2718 nbits = bitmap_weight(sparity->ebitmap, sparity->nsectors);
2719 if (nbits) {
2720 spin_lock(&sctx->stat_lock);
2721 sctx->stat.read_errors += nbits;
2722 sctx->stat.uncorrectable_errors += nbits;
2723 spin_unlock(&sctx->stat_lock);
2724 }
2725
2726 list_for_each_entry_safe(curr, next, &sparity->spages, list) {
2727 list_del_init(&curr->list);
2728 scrub_page_put(curr);
2729 }
2730
2731 kfree(sparity);
2732}
2733
Zhao Lei20b2e302015-06-04 20:09:15 +08002734static void scrub_parity_bio_endio_worker(struct btrfs_work *work)
2735{
2736 struct scrub_parity *sparity = container_of(work, struct scrub_parity,
2737 work);
2738 struct scrub_ctx *sctx = sparity->sctx;
2739
2740 scrub_free_parity(sparity);
2741 scrub_pending_bio_dec(sctx);
2742}
2743
Christoph Hellwig4246a0b2015-07-20 15:29:37 +02002744static void scrub_parity_bio_endio(struct bio *bio)
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002745{
2746 struct scrub_parity *sparity = (struct scrub_parity *)bio->bi_private;
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002747
Christoph Hellwig4246a0b2015-07-20 15:29:37 +02002748 if (bio->bi_error)
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002749 bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap,
2750 sparity->nsectors);
2751
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002752 bio_put(bio);
Zhao Lei20b2e302015-06-04 20:09:15 +08002753
2754 btrfs_init_work(&sparity->work, btrfs_scrubparity_helper,
2755 scrub_parity_bio_endio_worker, NULL, NULL);
2756 btrfs_queue_work(sparity->sctx->dev_root->fs_info->scrub_parity_workers,
2757 &sparity->work);
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002758}
2759
2760static void scrub_parity_check_and_repair(struct scrub_parity *sparity)
2761{
2762 struct scrub_ctx *sctx = sparity->sctx;
2763 struct bio *bio;
2764 struct btrfs_raid_bio *rbio;
2765 struct scrub_page *spage;
2766 struct btrfs_bio *bbio = NULL;
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002767 u64 length;
2768 int ret;
2769
2770 if (!bitmap_andnot(sparity->dbitmap, sparity->dbitmap, sparity->ebitmap,
2771 sparity->nsectors))
2772 goto out;
2773
Zhao Leia0dd59d2015-07-21 15:42:26 +08002774 length = sparity->logic_end - sparity->logic_start;
Miao Xie76035972014-11-14 17:45:42 +08002775 ret = btrfs_map_sblock(sctx->dev_root->fs_info, WRITE,
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002776 sparity->logic_start,
Zhao Lei8e5cfb52015-01-20 15:11:33 +08002777 &length, &bbio, 0, 1);
2778 if (ret || !bbio || !bbio->raid_map)
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002779 goto bbio_out;
2780
2781 bio = btrfs_io_bio_alloc(GFP_NOFS, 0);
2782 if (!bio)
2783 goto bbio_out;
2784
2785 bio->bi_iter.bi_sector = sparity->logic_start >> 9;
2786 bio->bi_private = sparity;
2787 bio->bi_end_io = scrub_parity_bio_endio;
2788
2789 rbio = raid56_parity_alloc_scrub_rbio(sctx->dev_root, bio, bbio,
Zhao Lei8e5cfb52015-01-20 15:11:33 +08002790 length, sparity->scrub_dev,
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002791 sparity->dbitmap,
2792 sparity->nsectors);
2793 if (!rbio)
2794 goto rbio_out;
2795
2796 list_for_each_entry(spage, &sparity->spages, list)
Omar Sandovalb4ee1782015-06-19 11:52:50 -07002797 raid56_add_scrub_pages(rbio, spage->page, spage->logical);
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002798
2799 scrub_pending_bio_inc(sctx);
2800 raid56_parity_submit_scrub_rbio(rbio);
2801 return;
2802
2803rbio_out:
2804 bio_put(bio);
2805bbio_out:
Zhao Lei6e9606d2015-01-20 15:11:34 +08002806 btrfs_put_bbio(bbio);
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002807 bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap,
2808 sparity->nsectors);
2809 spin_lock(&sctx->stat_lock);
2810 sctx->stat.malloc_errors++;
2811 spin_unlock(&sctx->stat_lock);
2812out:
2813 scrub_free_parity(sparity);
2814}
2815
2816static inline int scrub_calc_parity_bitmap_len(int nsectors)
2817{
2818 return DIV_ROUND_UP(nsectors, BITS_PER_LONG) * (BITS_PER_LONG / 8);
2819}
2820
2821static void scrub_parity_get(struct scrub_parity *sparity)
2822{
Zhao Lei57019342015-01-20 15:11:45 +08002823 atomic_inc(&sparity->refs);
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002824}
2825
2826static void scrub_parity_put(struct scrub_parity *sparity)
2827{
Zhao Lei57019342015-01-20 15:11:45 +08002828 if (!atomic_dec_and_test(&sparity->refs))
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002829 return;
2830
2831 scrub_parity_check_and_repair(sparity);
2832}
2833
2834static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx,
2835 struct map_lookup *map,
2836 struct btrfs_device *sdev,
2837 struct btrfs_path *path,
2838 u64 logic_start,
2839 u64 logic_end)
2840{
2841 struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
2842 struct btrfs_root *root = fs_info->extent_root;
2843 struct btrfs_root *csum_root = fs_info->csum_root;
2844 struct btrfs_extent_item *extent;
Omar Sandoval4a770892015-06-19 11:52:52 -07002845 struct btrfs_bio *bbio = NULL;
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002846 u64 flags;
2847 int ret;
2848 int slot;
2849 struct extent_buffer *l;
2850 struct btrfs_key key;
2851 u64 generation;
2852 u64 extent_logical;
2853 u64 extent_physical;
2854 u64 extent_len;
Omar Sandoval4a770892015-06-19 11:52:52 -07002855 u64 mapped_length;
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002856 struct btrfs_device *extent_dev;
2857 struct scrub_parity *sparity;
2858 int nsectors;
2859 int bitmap_len;
2860 int extent_mirror_num;
2861 int stop_loop = 0;
2862
2863 nsectors = map->stripe_len / root->sectorsize;
2864 bitmap_len = scrub_calc_parity_bitmap_len(nsectors);
2865 sparity = kzalloc(sizeof(struct scrub_parity) + 2 * bitmap_len,
2866 GFP_NOFS);
2867 if (!sparity) {
2868 spin_lock(&sctx->stat_lock);
2869 sctx->stat.malloc_errors++;
2870 spin_unlock(&sctx->stat_lock);
2871 return -ENOMEM;
2872 }
2873
2874 sparity->stripe_len = map->stripe_len;
2875 sparity->nsectors = nsectors;
2876 sparity->sctx = sctx;
2877 sparity->scrub_dev = sdev;
2878 sparity->logic_start = logic_start;
2879 sparity->logic_end = logic_end;
Zhao Lei57019342015-01-20 15:11:45 +08002880 atomic_set(&sparity->refs, 1);
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002881 INIT_LIST_HEAD(&sparity->spages);
2882 sparity->dbitmap = sparity->bitmap;
2883 sparity->ebitmap = (void *)sparity->bitmap + bitmap_len;
2884
2885 ret = 0;
2886 while (logic_start < logic_end) {
2887 if (btrfs_fs_incompat(fs_info, SKINNY_METADATA))
2888 key.type = BTRFS_METADATA_ITEM_KEY;
2889 else
2890 key.type = BTRFS_EXTENT_ITEM_KEY;
2891 key.objectid = logic_start;
2892 key.offset = (u64)-1;
2893
2894 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2895 if (ret < 0)
2896 goto out;
2897
2898 if (ret > 0) {
2899 ret = btrfs_previous_extent_item(root, path, 0);
2900 if (ret < 0)
2901 goto out;
2902 if (ret > 0) {
2903 btrfs_release_path(path);
2904 ret = btrfs_search_slot(NULL, root, &key,
2905 path, 0, 0);
2906 if (ret < 0)
2907 goto out;
2908 }
2909 }
2910
2911 stop_loop = 0;
2912 while (1) {
2913 u64 bytes;
2914
2915 l = path->nodes[0];
2916 slot = path->slots[0];
2917 if (slot >= btrfs_header_nritems(l)) {
2918 ret = btrfs_next_leaf(root, path);
2919 if (ret == 0)
2920 continue;
2921 if (ret < 0)
2922 goto out;
2923
2924 stop_loop = 1;
2925 break;
2926 }
2927 btrfs_item_key_to_cpu(l, &key, slot);
2928
Zhao Leid7cad232015-07-22 13:14:48 +08002929 if (key.type != BTRFS_EXTENT_ITEM_KEY &&
2930 key.type != BTRFS_METADATA_ITEM_KEY)
2931 goto next;
2932
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002933 if (key.type == BTRFS_METADATA_ITEM_KEY)
2934 bytes = root->nodesize;
2935 else
2936 bytes = key.offset;
2937
2938 if (key.objectid + bytes <= logic_start)
2939 goto next;
2940
Zhao Leia0dd59d2015-07-21 15:42:26 +08002941 if (key.objectid >= logic_end) {
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002942 stop_loop = 1;
2943 break;
2944 }
2945
2946 while (key.objectid >= logic_start + map->stripe_len)
2947 logic_start += map->stripe_len;
2948
2949 extent = btrfs_item_ptr(l, slot,
2950 struct btrfs_extent_item);
2951 flags = btrfs_extent_flags(l, extent);
2952 generation = btrfs_extent_generation(l, extent);
2953
Zhao Leia323e812015-07-23 12:29:49 +08002954 if ((flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) &&
2955 (key.objectid < logic_start ||
2956 key.objectid + bytes >
2957 logic_start + map->stripe_len)) {
2958 btrfs_err(fs_info, "scrub: tree block %llu spanning stripes, ignored. logical=%llu",
2959 key.objectid, logic_start);
Zhao Lei9799d2c2015-08-25 21:31:40 +08002960 spin_lock(&sctx->stat_lock);
2961 sctx->stat.uncorrectable_errors++;
2962 spin_unlock(&sctx->stat_lock);
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002963 goto next;
2964 }
2965again:
2966 extent_logical = key.objectid;
2967 extent_len = bytes;
2968
2969 if (extent_logical < logic_start) {
2970 extent_len -= logic_start - extent_logical;
2971 extent_logical = logic_start;
2972 }
2973
2974 if (extent_logical + extent_len >
2975 logic_start + map->stripe_len)
2976 extent_len = logic_start + map->stripe_len -
2977 extent_logical;
2978
2979 scrub_parity_mark_sectors_data(sparity, extent_logical,
2980 extent_len);
2981
Omar Sandoval4a770892015-06-19 11:52:52 -07002982 mapped_length = extent_len;
2983 ret = btrfs_map_block(fs_info, READ, extent_logical,
2984 &mapped_length, &bbio, 0);
2985 if (!ret) {
2986 if (!bbio || mapped_length < extent_len)
2987 ret = -EIO;
2988 }
2989 if (ret) {
2990 btrfs_put_bbio(bbio);
2991 goto out;
2992 }
2993 extent_physical = bbio->stripes[0].physical;
2994 extent_mirror_num = bbio->mirror_num;
2995 extent_dev = bbio->stripes[0].dev;
2996 btrfs_put_bbio(bbio);
Miao Xie5a6ac9e2014-11-06 17:20:58 +08002997
2998 ret = btrfs_lookup_csums_range(csum_root,
2999 extent_logical,
3000 extent_logical + extent_len - 1,
3001 &sctx->csum_list, 1);
3002 if (ret)
3003 goto out;
3004
3005 ret = scrub_extent_for_parity(sparity, extent_logical,
3006 extent_len,
3007 extent_physical,
3008 extent_dev, flags,
3009 generation,
3010 extent_mirror_num);
Zhao Lei6fa96d72015-07-21 12:22:30 +08003011
3012 scrub_free_csums(sctx);
3013
Miao Xie5a6ac9e2014-11-06 17:20:58 +08003014 if (ret)
3015 goto out;
3016
Miao Xie5a6ac9e2014-11-06 17:20:58 +08003017 if (extent_logical + extent_len <
3018 key.objectid + bytes) {
3019 logic_start += map->stripe_len;
3020
3021 if (logic_start >= logic_end) {
3022 stop_loop = 1;
3023 break;
3024 }
3025
3026 if (logic_start < key.objectid + bytes) {
3027 cond_resched();
3028 goto again;
3029 }
3030 }
3031next:
3032 path->slots[0]++;
3033 }
3034
3035 btrfs_release_path(path);
3036
3037 if (stop_loop)
3038 break;
3039
3040 logic_start += map->stripe_len;
3041 }
3042out:
3043 if (ret < 0)
3044 scrub_parity_mark_sectors_error(sparity, logic_start,
Zhao Leia0dd59d2015-07-21 15:42:26 +08003045 logic_end - logic_start);
Miao Xie5a6ac9e2014-11-06 17:20:58 +08003046 scrub_parity_put(sparity);
3047 scrub_submit(sctx);
3048 mutex_lock(&sctx->wr_ctx.wr_lock);
3049 scrub_wr_submit(sctx);
3050 mutex_unlock(&sctx->wr_ctx.wr_lock);
3051
3052 btrfs_release_path(path);
3053 return ret < 0 ? ret : 0;
3054}
3055
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003056static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01003057 struct map_lookup *map,
3058 struct btrfs_device *scrub_dev,
Stefan Behrensff023aa2012-11-06 11:43:11 +01003059 int num, u64 base, u64 length,
3060 int is_dev_replace)
Arne Jansena2de7332011-03-08 14:14:00 +01003061{
Miao Xie5a6ac9e2014-11-06 17:20:58 +08003062 struct btrfs_path *path, *ppath;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01003063 struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
Arne Jansena2de7332011-03-08 14:14:00 +01003064 struct btrfs_root *root = fs_info->extent_root;
3065 struct btrfs_root *csum_root = fs_info->csum_root;
3066 struct btrfs_extent_item *extent;
Arne Jansene7786c32011-05-28 20:58:38 +00003067 struct blk_plug plug;
Arne Jansena2de7332011-03-08 14:14:00 +01003068 u64 flags;
3069 int ret;
3070 int slot;
Arne Jansena2de7332011-03-08 14:14:00 +01003071 u64 nstripes;
Arne Jansena2de7332011-03-08 14:14:00 +01003072 struct extent_buffer *l;
3073 struct btrfs_key key;
3074 u64 physical;
3075 u64 logical;
Liu Bo625f1c8d2013-04-27 02:56:57 +00003076 u64 logic_end;
Wang Shilong3b080b22014-04-01 18:01:43 +08003077 u64 physical_end;
Arne Jansena2de7332011-03-08 14:14:00 +01003078 u64 generation;
Jan Schmidte12fa9c2011-06-17 15:55:21 +02003079 int mirror_num;
Arne Jansen7a262852011-06-10 12:39:23 +02003080 struct reada_control *reada1;
3081 struct reada_control *reada2;
3082 struct btrfs_key key_start;
3083 struct btrfs_key key_end;
Arne Jansena2de7332011-03-08 14:14:00 +01003084 u64 increment = map->stripe_len;
3085 u64 offset;
Stefan Behrensff023aa2012-11-06 11:43:11 +01003086 u64 extent_logical;
3087 u64 extent_physical;
3088 u64 extent_len;
Miao Xie5a6ac9e2014-11-06 17:20:58 +08003089 u64 stripe_logical;
3090 u64 stripe_end;
Stefan Behrensff023aa2012-11-06 11:43:11 +01003091 struct btrfs_device *extent_dev;
3092 int extent_mirror_num;
Wang Shilong3b080b22014-04-01 18:01:43 +08003093 int stop_loop = 0;
David Woodhouse53b381b2013-01-29 18:40:14 -05003094
Wang Shilong3b080b22014-04-01 18:01:43 +08003095 physical = map->stripes[num].physical;
Arne Jansena2de7332011-03-08 14:14:00 +01003096 offset = 0;
David Sterbab8b93ad2015-01-16 17:26:13 +01003097 nstripes = div_u64(length, map->stripe_len);
Arne Jansena2de7332011-03-08 14:14:00 +01003098 if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
3099 offset = map->stripe_len * num;
3100 increment = map->stripe_len * map->num_stripes;
Jan Schmidt193ea742011-06-13 19:56:54 +02003101 mirror_num = 1;
Arne Jansena2de7332011-03-08 14:14:00 +01003102 } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
3103 int factor = map->num_stripes / map->sub_stripes;
3104 offset = map->stripe_len * (num / map->sub_stripes);
3105 increment = map->stripe_len * factor;
Jan Schmidt193ea742011-06-13 19:56:54 +02003106 mirror_num = num % map->sub_stripes + 1;
Arne Jansena2de7332011-03-08 14:14:00 +01003107 } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
3108 increment = map->stripe_len;
Jan Schmidt193ea742011-06-13 19:56:54 +02003109 mirror_num = num % map->num_stripes + 1;
Arne Jansena2de7332011-03-08 14:14:00 +01003110 } else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
3111 increment = map->stripe_len;
Jan Schmidt193ea742011-06-13 19:56:54 +02003112 mirror_num = num % map->num_stripes + 1;
Zhao Leiffe2d202015-01-20 15:11:44 +08003113 } else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
Miao Xie5a6ac9e2014-11-06 17:20:58 +08003114 get_raid56_logic_offset(physical, num, map, &offset, NULL);
Wang Shilong3b080b22014-04-01 18:01:43 +08003115 increment = map->stripe_len * nr_data_stripes(map);
3116 mirror_num = 1;
Arne Jansena2de7332011-03-08 14:14:00 +01003117 } else {
3118 increment = map->stripe_len;
Jan Schmidt193ea742011-06-13 19:56:54 +02003119 mirror_num = 1;
Arne Jansena2de7332011-03-08 14:14:00 +01003120 }
3121
3122 path = btrfs_alloc_path();
3123 if (!path)
3124 return -ENOMEM;
3125
Miao Xie5a6ac9e2014-11-06 17:20:58 +08003126 ppath = btrfs_alloc_path();
3127 if (!ppath) {
Tsutomu Itoh379d6852015-01-09 17:37:52 +09003128 btrfs_free_path(path);
Miao Xie5a6ac9e2014-11-06 17:20:58 +08003129 return -ENOMEM;
3130 }
3131
Stefan Behrensb5d67f62012-03-27 14:21:27 -04003132 /*
3133 * work on commit root. The related disk blocks are static as
3134 * long as COW is applied. This means, it is save to rewrite
3135 * them to repair disk errors without any race conditions
3136 */
Arne Jansena2de7332011-03-08 14:14:00 +01003137 path->search_commit_root = 1;
3138 path->skip_locking = 1;
3139
Gui Hecheng063c54d2015-01-09 09:39:40 +08003140 ppath->search_commit_root = 1;
3141 ppath->skip_locking = 1;
Arne Jansena2de7332011-03-08 14:14:00 +01003142 /*
Arne Jansen7a262852011-06-10 12:39:23 +02003143 * trigger the readahead for extent tree csum tree and wait for
3144 * completion. During readahead, the scrub is officially paused
3145 * to not hold off transaction commits
Arne Jansena2de7332011-03-08 14:14:00 +01003146 */
3147 logical = base + offset;
Wang Shilong3b080b22014-04-01 18:01:43 +08003148 physical_end = physical + nstripes * map->stripe_len;
Zhao Leiffe2d202015-01-20 15:11:44 +08003149 if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
Wang Shilong3b080b22014-04-01 18:01:43 +08003150 get_raid56_logic_offset(physical_end, num,
Miao Xie5a6ac9e2014-11-06 17:20:58 +08003151 map, &logic_end, NULL);
Wang Shilong3b080b22014-04-01 18:01:43 +08003152 logic_end += base;
3153 } else {
3154 logic_end = logical + increment * nstripes;
3155 }
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003156 wait_event(sctx->list_wait,
Stefan Behrensb6bfebc2012-11-02 16:44:58 +01003157 atomic_read(&sctx->bios_in_flight) == 0);
Wang Shilongcb7ab022013-12-04 21:16:53 +08003158 scrub_blocked_if_needed(fs_info);
Arne Jansena2de7332011-03-08 14:14:00 +01003159
Arne Jansen7a262852011-06-10 12:39:23 +02003160 /* FIXME it might be better to start readahead at commit root */
3161 key_start.objectid = logical;
3162 key_start.type = BTRFS_EXTENT_ITEM_KEY;
3163 key_start.offset = (u64)0;
Wang Shilong3b080b22014-04-01 18:01:43 +08003164 key_end.objectid = logic_end;
Josef Bacik3173a182013-03-07 14:22:04 -05003165 key_end.type = BTRFS_METADATA_ITEM_KEY;
3166 key_end.offset = (u64)-1;
Arne Jansen7a262852011-06-10 12:39:23 +02003167 reada1 = btrfs_reada_add(root, &key_start, &key_end);
Arne Jansena2de7332011-03-08 14:14:00 +01003168
Arne Jansen7a262852011-06-10 12:39:23 +02003169 key_start.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
3170 key_start.type = BTRFS_EXTENT_CSUM_KEY;
3171 key_start.offset = logical;
3172 key_end.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
3173 key_end.type = BTRFS_EXTENT_CSUM_KEY;
Wang Shilong3b080b22014-04-01 18:01:43 +08003174 key_end.offset = logic_end;
Arne Jansen7a262852011-06-10 12:39:23 +02003175 reada2 = btrfs_reada_add(csum_root, &key_start, &key_end);
Arne Jansena2de7332011-03-08 14:14:00 +01003176
Arne Jansen7a262852011-06-10 12:39:23 +02003177 if (!IS_ERR(reada1))
3178 btrfs_reada_wait(reada1);
3179 if (!IS_ERR(reada2))
3180 btrfs_reada_wait(reada2);
Arne Jansena2de7332011-03-08 14:14:00 +01003181
Arne Jansena2de7332011-03-08 14:14:00 +01003182
3183 /*
3184 * collect all data csums for the stripe to avoid seeking during
3185 * the scrub. This might currently (crc32) end up to be about 1MB
3186 */
Arne Jansene7786c32011-05-28 20:58:38 +00003187 blk_start_plug(&plug);
Arne Jansena2de7332011-03-08 14:14:00 +01003188
Arne Jansena2de7332011-03-08 14:14:00 +01003189 /*
3190 * now find all extents for each stripe and scrub them
3191 */
Arne Jansena2de7332011-03-08 14:14:00 +01003192 ret = 0;
Wang Shilong3b080b22014-04-01 18:01:43 +08003193 while (physical < physical_end) {
Arne Jansena2de7332011-03-08 14:14:00 +01003194 /*
3195 * canceled?
3196 */
3197 if (atomic_read(&fs_info->scrub_cancel_req) ||
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003198 atomic_read(&sctx->cancel_req)) {
Arne Jansena2de7332011-03-08 14:14:00 +01003199 ret = -ECANCELED;
3200 goto out;
3201 }
3202 /*
3203 * check to see if we have to pause
3204 */
3205 if (atomic_read(&fs_info->scrub_pause_req)) {
3206 /* push queued extents */
Stefan Behrensff023aa2012-11-06 11:43:11 +01003207 atomic_set(&sctx->wr_ctx.flush_all_writes, 1);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003208 scrub_submit(sctx);
Stefan Behrensff023aa2012-11-06 11:43:11 +01003209 mutex_lock(&sctx->wr_ctx.wr_lock);
3210 scrub_wr_submit(sctx);
3211 mutex_unlock(&sctx->wr_ctx.wr_lock);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003212 wait_event(sctx->list_wait,
Stefan Behrensb6bfebc2012-11-02 16:44:58 +01003213 atomic_read(&sctx->bios_in_flight) == 0);
Stefan Behrensff023aa2012-11-06 11:43:11 +01003214 atomic_set(&sctx->wr_ctx.flush_all_writes, 0);
Wang Shilong3cb09292013-12-04 21:15:19 +08003215 scrub_blocked_if_needed(fs_info);
Arne Jansena2de7332011-03-08 14:14:00 +01003216 }
3217
Zhao Leif2f66a22015-07-21 12:22:29 +08003218 if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
3219 ret = get_raid56_logic_offset(physical, num, map,
3220 &logical,
3221 &stripe_logical);
3222 logical += base;
3223 if (ret) {
Zhao Lei79553232015-08-18 17:54:30 +08003224 /* it is parity strip */
Zhao Leif2f66a22015-07-21 12:22:29 +08003225 stripe_logical += base;
Zhao Leia0dd59d2015-07-21 15:42:26 +08003226 stripe_end = stripe_logical + increment;
Zhao Leif2f66a22015-07-21 12:22:29 +08003227 ret = scrub_raid56_parity(sctx, map, scrub_dev,
3228 ppath, stripe_logical,
3229 stripe_end);
3230 if (ret)
3231 goto out;
3232 goto skip;
3233 }
3234 }
3235
Wang Shilong7c76edb2014-01-12 21:38:32 +08003236 if (btrfs_fs_incompat(fs_info, SKINNY_METADATA))
3237 key.type = BTRFS_METADATA_ITEM_KEY;
3238 else
3239 key.type = BTRFS_EXTENT_ITEM_KEY;
Arne Jansena2de7332011-03-08 14:14:00 +01003240 key.objectid = logical;
Liu Bo625f1c8d2013-04-27 02:56:57 +00003241 key.offset = (u64)-1;
Arne Jansena2de7332011-03-08 14:14:00 +01003242
3243 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3244 if (ret < 0)
3245 goto out;
Josef Bacik3173a182013-03-07 14:22:04 -05003246
Arne Jansen8c510322011-06-03 10:09:26 +02003247 if (ret > 0) {
Wang Shilongade2e0b2014-01-12 21:38:33 +08003248 ret = btrfs_previous_extent_item(root, path, 0);
Arne Jansena2de7332011-03-08 14:14:00 +01003249 if (ret < 0)
3250 goto out;
Arne Jansen8c510322011-06-03 10:09:26 +02003251 if (ret > 0) {
3252 /* there's no smaller item, so stick with the
3253 * larger one */
3254 btrfs_release_path(path);
3255 ret = btrfs_search_slot(NULL, root, &key,
3256 path, 0, 0);
3257 if (ret < 0)
3258 goto out;
3259 }
Arne Jansena2de7332011-03-08 14:14:00 +01003260 }
3261
Liu Bo625f1c8d2013-04-27 02:56:57 +00003262 stop_loop = 0;
Arne Jansena2de7332011-03-08 14:14:00 +01003263 while (1) {
Josef Bacik3173a182013-03-07 14:22:04 -05003264 u64 bytes;
3265
Arne Jansena2de7332011-03-08 14:14:00 +01003266 l = path->nodes[0];
3267 slot = path->slots[0];
3268 if (slot >= btrfs_header_nritems(l)) {
3269 ret = btrfs_next_leaf(root, path);
3270 if (ret == 0)
3271 continue;
3272 if (ret < 0)
3273 goto out;
3274
Liu Bo625f1c8d2013-04-27 02:56:57 +00003275 stop_loop = 1;
Arne Jansena2de7332011-03-08 14:14:00 +01003276 break;
3277 }
3278 btrfs_item_key_to_cpu(l, &key, slot);
3279
Zhao Leid7cad232015-07-22 13:14:48 +08003280 if (key.type != BTRFS_EXTENT_ITEM_KEY &&
3281 key.type != BTRFS_METADATA_ITEM_KEY)
3282 goto next;
3283
Josef Bacik3173a182013-03-07 14:22:04 -05003284 if (key.type == BTRFS_METADATA_ITEM_KEY)
David Sterba707e8a02014-06-04 19:22:26 +02003285 bytes = root->nodesize;
Josef Bacik3173a182013-03-07 14:22:04 -05003286 else
3287 bytes = key.offset;
3288
3289 if (key.objectid + bytes <= logical)
Arne Jansena2de7332011-03-08 14:14:00 +01003290 goto next;
3291
Liu Bo625f1c8d2013-04-27 02:56:57 +00003292 if (key.objectid >= logical + map->stripe_len) {
3293 /* out of this device extent */
3294 if (key.objectid >= logic_end)
3295 stop_loop = 1;
3296 break;
3297 }
Arne Jansena2de7332011-03-08 14:14:00 +01003298
3299 extent = btrfs_item_ptr(l, slot,
3300 struct btrfs_extent_item);
3301 flags = btrfs_extent_flags(l, extent);
3302 generation = btrfs_extent_generation(l, extent);
3303
Zhao Leia323e812015-07-23 12:29:49 +08003304 if ((flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) &&
3305 (key.objectid < logical ||
3306 key.objectid + bytes >
3307 logical + map->stripe_len)) {
Frank Holtonefe120a2013-12-20 11:37:06 -05003308 btrfs_err(fs_info,
3309 "scrub: tree block %llu spanning "
3310 "stripes, ignored. logical=%llu",
Geert Uytterhoevenc1c9ff72013-08-20 13:20:07 +02003311 key.objectid, logical);
Zhao Lei9799d2c2015-08-25 21:31:40 +08003312 spin_lock(&sctx->stat_lock);
3313 sctx->stat.uncorrectable_errors++;
3314 spin_unlock(&sctx->stat_lock);
Arne Jansena2de7332011-03-08 14:14:00 +01003315 goto next;
3316 }
3317
Liu Bo625f1c8d2013-04-27 02:56:57 +00003318again:
3319 extent_logical = key.objectid;
3320 extent_len = bytes;
3321
Arne Jansena2de7332011-03-08 14:14:00 +01003322 /*
3323 * trim extent to this stripe
3324 */
Liu Bo625f1c8d2013-04-27 02:56:57 +00003325 if (extent_logical < logical) {
3326 extent_len -= logical - extent_logical;
3327 extent_logical = logical;
Arne Jansena2de7332011-03-08 14:14:00 +01003328 }
Liu Bo625f1c8d2013-04-27 02:56:57 +00003329 if (extent_logical + extent_len >
Arne Jansena2de7332011-03-08 14:14:00 +01003330 logical + map->stripe_len) {
Liu Bo625f1c8d2013-04-27 02:56:57 +00003331 extent_len = logical + map->stripe_len -
3332 extent_logical;
Arne Jansena2de7332011-03-08 14:14:00 +01003333 }
3334
Liu Bo625f1c8d2013-04-27 02:56:57 +00003335 extent_physical = extent_logical - logical + physical;
Stefan Behrensff023aa2012-11-06 11:43:11 +01003336 extent_dev = scrub_dev;
3337 extent_mirror_num = mirror_num;
3338 if (is_dev_replace)
3339 scrub_remap_extent(fs_info, extent_logical,
3340 extent_len, &extent_physical,
3341 &extent_dev,
3342 &extent_mirror_num);
Liu Bo625f1c8d2013-04-27 02:56:57 +00003343
Zhao Leife8cf652015-07-22 13:14:47 +08003344 ret = btrfs_lookup_csums_range(csum_root,
3345 extent_logical,
3346 extent_logical +
3347 extent_len - 1,
3348 &sctx->csum_list, 1);
Arne Jansena2de7332011-03-08 14:14:00 +01003349 if (ret)
3350 goto out;
3351
Liu Bo625f1c8d2013-04-27 02:56:57 +00003352 ret = scrub_extent(sctx, extent_logical, extent_len,
3353 extent_physical, extent_dev, flags,
3354 generation, extent_mirror_num,
Stefan Behrens115930c2013-07-04 16:14:23 +02003355 extent_logical - logical + physical);
Zhao Lei6fa96d72015-07-21 12:22:30 +08003356
3357 scrub_free_csums(sctx);
3358
Liu Bo625f1c8d2013-04-27 02:56:57 +00003359 if (ret)
3360 goto out;
3361
3362 if (extent_logical + extent_len <
3363 key.objectid + bytes) {
Zhao Leiffe2d202015-01-20 15:11:44 +08003364 if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
Wang Shilong3b080b22014-04-01 18:01:43 +08003365 /*
3366 * loop until we find next data stripe
3367 * or we have finished all stripes.
3368 */
Miao Xie5a6ac9e2014-11-06 17:20:58 +08003369loop:
3370 physical += map->stripe_len;
3371 ret = get_raid56_logic_offset(physical,
3372 num, map, &logical,
3373 &stripe_logical);
3374 logical += base;
3375
3376 if (ret && physical < physical_end) {
3377 stripe_logical += base;
3378 stripe_end = stripe_logical +
Zhao Leia0dd59d2015-07-21 15:42:26 +08003379 increment;
Miao Xie5a6ac9e2014-11-06 17:20:58 +08003380 ret = scrub_raid56_parity(sctx,
3381 map, scrub_dev, ppath,
3382 stripe_logical,
3383 stripe_end);
3384 if (ret)
3385 goto out;
3386 goto loop;
3387 }
Wang Shilong3b080b22014-04-01 18:01:43 +08003388 } else {
3389 physical += map->stripe_len;
3390 logical += increment;
3391 }
Liu Bo625f1c8d2013-04-27 02:56:57 +00003392 if (logical < key.objectid + bytes) {
3393 cond_resched();
3394 goto again;
3395 }
3396
Wang Shilong3b080b22014-04-01 18:01:43 +08003397 if (physical >= physical_end) {
Liu Bo625f1c8d2013-04-27 02:56:57 +00003398 stop_loop = 1;
3399 break;
3400 }
3401 }
Arne Jansena2de7332011-03-08 14:14:00 +01003402next:
3403 path->slots[0]++;
3404 }
Chris Mason71267332011-05-23 06:30:52 -04003405 btrfs_release_path(path);
Wang Shilong3b080b22014-04-01 18:01:43 +08003406skip:
Arne Jansena2de7332011-03-08 14:14:00 +01003407 logical += increment;
3408 physical += map->stripe_len;
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003409 spin_lock(&sctx->stat_lock);
Liu Bo625f1c8d2013-04-27 02:56:57 +00003410 if (stop_loop)
3411 sctx->stat.last_physical = map->stripes[num].physical +
3412 length;
3413 else
3414 sctx->stat.last_physical = physical;
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003415 spin_unlock(&sctx->stat_lock);
Liu Bo625f1c8d2013-04-27 02:56:57 +00003416 if (stop_loop)
3417 break;
Arne Jansena2de7332011-03-08 14:14:00 +01003418 }
Stefan Behrensff023aa2012-11-06 11:43:11 +01003419out:
Arne Jansena2de7332011-03-08 14:14:00 +01003420 /* push queued extents */
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003421 scrub_submit(sctx);
Stefan Behrensff023aa2012-11-06 11:43:11 +01003422 mutex_lock(&sctx->wr_ctx.wr_lock);
3423 scrub_wr_submit(sctx);
3424 mutex_unlock(&sctx->wr_ctx.wr_lock);
Arne Jansena2de7332011-03-08 14:14:00 +01003425
Arne Jansene7786c32011-05-28 20:58:38 +00003426 blk_finish_plug(&plug);
Arne Jansena2de7332011-03-08 14:14:00 +01003427 btrfs_free_path(path);
Miao Xie5a6ac9e2014-11-06 17:20:58 +08003428 btrfs_free_path(ppath);
Arne Jansena2de7332011-03-08 14:14:00 +01003429 return ret < 0 ? ret : 0;
3430}
3431
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003432static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx,
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01003433 struct btrfs_device *scrub_dev,
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01003434 u64 chunk_offset, u64 length,
Stefan Behrensff023aa2012-11-06 11:43:11 +01003435 u64 dev_offset, int is_dev_replace)
Arne Jansena2de7332011-03-08 14:14:00 +01003436{
3437 struct btrfs_mapping_tree *map_tree =
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01003438 &sctx->dev_root->fs_info->mapping_tree;
Arne Jansena2de7332011-03-08 14:14:00 +01003439 struct map_lookup *map;
3440 struct extent_map *em;
3441 int i;
Stefan Behrensff023aa2012-11-06 11:43:11 +01003442 int ret = 0;
Arne Jansena2de7332011-03-08 14:14:00 +01003443
3444 read_lock(&map_tree->map_tree.lock);
3445 em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1);
3446 read_unlock(&map_tree->map_tree.lock);
3447
3448 if (!em)
3449 return -EINVAL;
3450
3451 map = (struct map_lookup *)em->bdev;
3452 if (em->start != chunk_offset)
3453 goto out;
3454
3455 if (em->len < length)
3456 goto out;
3457
3458 for (i = 0; i < map->num_stripes; ++i) {
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01003459 if (map->stripes[i].dev->bdev == scrub_dev->bdev &&
Arne Jansen859acaf2012-02-09 15:09:02 +01003460 map->stripes[i].physical == dev_offset) {
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01003461 ret = scrub_stripe(sctx, map, scrub_dev, i,
Stefan Behrensff023aa2012-11-06 11:43:11 +01003462 chunk_offset, length,
3463 is_dev_replace);
Arne Jansena2de7332011-03-08 14:14:00 +01003464 if (ret)
3465 goto out;
3466 }
3467 }
3468out:
3469 free_extent_map(em);
3470
3471 return ret;
3472}
3473
3474static noinline_for_stack
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01003475int scrub_enumerate_chunks(struct scrub_ctx *sctx,
Stefan Behrensff023aa2012-11-06 11:43:11 +01003476 struct btrfs_device *scrub_dev, u64 start, u64 end,
3477 int is_dev_replace)
Arne Jansena2de7332011-03-08 14:14:00 +01003478{
3479 struct btrfs_dev_extent *dev_extent = NULL;
3480 struct btrfs_path *path;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01003481 struct btrfs_root *root = sctx->dev_root;
Arne Jansena2de7332011-03-08 14:14:00 +01003482 struct btrfs_fs_info *fs_info = root->fs_info;
3483 u64 length;
Arne Jansena2de7332011-03-08 14:14:00 +01003484 u64 chunk_offset;
Zhaolei55e3a602015-08-05 16:43:30 +08003485 int ret = 0;
Zhaolei76a8efa2015-11-17 18:46:17 +08003486 int ro_set;
Arne Jansena2de7332011-03-08 14:14:00 +01003487 int slot;
3488 struct extent_buffer *l;
3489 struct btrfs_key key;
3490 struct btrfs_key found_key;
3491 struct btrfs_block_group_cache *cache;
Stefan Behrensff023aa2012-11-06 11:43:11 +01003492 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
Arne Jansena2de7332011-03-08 14:14:00 +01003493
3494 path = btrfs_alloc_path();
3495 if (!path)
3496 return -ENOMEM;
3497
3498 path->reada = 2;
3499 path->search_commit_root = 1;
3500 path->skip_locking = 1;
3501
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01003502 key.objectid = scrub_dev->devid;
Arne Jansena2de7332011-03-08 14:14:00 +01003503 key.offset = 0ull;
3504 key.type = BTRFS_DEV_EXTENT_KEY;
3505
Arne Jansena2de7332011-03-08 14:14:00 +01003506 while (1) {
3507 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3508 if (ret < 0)
Arne Jansen8c510322011-06-03 10:09:26 +02003509 break;
3510 if (ret > 0) {
3511 if (path->slots[0] >=
3512 btrfs_header_nritems(path->nodes[0])) {
3513 ret = btrfs_next_leaf(root, path);
Zhaolei55e3a602015-08-05 16:43:30 +08003514 if (ret < 0)
Arne Jansen8c510322011-06-03 10:09:26 +02003515 break;
Zhaolei55e3a602015-08-05 16:43:30 +08003516 if (ret > 0) {
3517 ret = 0;
3518 break;
3519 }
3520 } else {
3521 ret = 0;
Arne Jansen8c510322011-06-03 10:09:26 +02003522 }
3523 }
Arne Jansena2de7332011-03-08 14:14:00 +01003524
3525 l = path->nodes[0];
3526 slot = path->slots[0];
3527
3528 btrfs_item_key_to_cpu(l, &found_key, slot);
3529
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01003530 if (found_key.objectid != scrub_dev->devid)
Arne Jansena2de7332011-03-08 14:14:00 +01003531 break;
3532
David Sterba962a2982014-06-04 18:41:45 +02003533 if (found_key.type != BTRFS_DEV_EXTENT_KEY)
Arne Jansena2de7332011-03-08 14:14:00 +01003534 break;
3535
3536 if (found_key.offset >= end)
3537 break;
3538
3539 if (found_key.offset < key.offset)
3540 break;
3541
3542 dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent);
3543 length = btrfs_dev_extent_length(l, dev_extent);
3544
Qu Wenruoced96ed2014-06-19 10:42:51 +08003545 if (found_key.offset + length <= start)
3546 goto skip;
Arne Jansena2de7332011-03-08 14:14:00 +01003547
Arne Jansena2de7332011-03-08 14:14:00 +01003548 chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent);
3549
3550 /*
3551 * get a reference on the corresponding block group to prevent
3552 * the chunk from going away while we scrub it
3553 */
3554 cache = btrfs_lookup_block_group(fs_info, chunk_offset);
Qu Wenruoced96ed2014-06-19 10:42:51 +08003555
3556 /* some chunks are removed but not committed to disk yet,
3557 * continue scrubbing */
3558 if (!cache)
3559 goto skip;
3560
Zhaolei55e3a602015-08-05 16:43:30 +08003561 /*
3562 * we need call btrfs_inc_block_group_ro() with scrubs_paused,
3563 * to avoid deadlock caused by:
3564 * btrfs_inc_block_group_ro()
3565 * -> btrfs_wait_for_commit()
3566 * -> btrfs_commit_transaction()
3567 * -> btrfs_scrub_pause()
3568 */
3569 scrub_pause_on(fs_info);
3570 ret = btrfs_inc_block_group_ro(root, cache);
3571 scrub_pause_off(fs_info);
Zhaolei76a8efa2015-11-17 18:46:17 +08003572
3573 if (ret == 0) {
3574 ro_set = 1;
3575 } else if (ret == -ENOSPC) {
3576 /*
3577 * btrfs_inc_block_group_ro return -ENOSPC when it
3578 * failed in creating new chunk for metadata.
3579 * It is not a problem for scrub/replace, because
3580 * metadata are always cowed, and our scrub paused
3581 * commit_transactions.
3582 */
3583 ro_set = 0;
3584 } else {
3585 btrfs_warn(fs_info, "failed setting block group ro, ret=%d\n",
3586 ret);
Zhaolei55e3a602015-08-05 16:43:30 +08003587 btrfs_put_block_group(cache);
3588 break;
3589 }
3590
Stefan Behrensff023aa2012-11-06 11:43:11 +01003591 dev_replace->cursor_right = found_key.offset + length;
3592 dev_replace->cursor_left = found_key.offset;
3593 dev_replace->item_needs_writeback = 1;
Zhao Lei8c204c92015-08-19 15:02:40 +08003594 ret = scrub_chunk(sctx, scrub_dev, chunk_offset, length,
3595 found_key.offset, is_dev_replace);
Stefan Behrensff023aa2012-11-06 11:43:11 +01003596
3597 /*
3598 * flush, submit all pending read and write bios, afterwards
3599 * wait for them.
3600 * Note that in the dev replace case, a read request causes
3601 * write requests that are submitted in the read completion
3602 * worker. Therefore in the current situation, it is required
3603 * that all write requests are flushed, so that all read and
3604 * write requests are really completed when bios_in_flight
3605 * changes to 0.
3606 */
3607 atomic_set(&sctx->wr_ctx.flush_all_writes, 1);
3608 scrub_submit(sctx);
3609 mutex_lock(&sctx->wr_ctx.wr_lock);
3610 scrub_wr_submit(sctx);
3611 mutex_unlock(&sctx->wr_ctx.wr_lock);
3612
3613 wait_event(sctx->list_wait,
3614 atomic_read(&sctx->bios_in_flight) == 0);
Zhaoleib708ce92015-08-05 16:43:29 +08003615
3616 scrub_pause_on(fs_info);
Wang Shilong12cf9372014-02-19 19:24:17 +08003617
3618 /*
3619 * must be called before we decrease @scrub_paused.
3620 * make sure we don't block transaction commit while
3621 * we are waiting pending workers finished.
3622 */
Stefan Behrensff023aa2012-11-06 11:43:11 +01003623 wait_event(sctx->list_wait,
3624 atomic_read(&sctx->workers_pending) == 0);
Wang Shilong12cf9372014-02-19 19:24:17 +08003625 atomic_set(&sctx->wr_ctx.flush_all_writes, 0);
3626
Zhaoleib708ce92015-08-05 16:43:29 +08003627 scrub_pause_off(fs_info);
Stefan Behrensff023aa2012-11-06 11:43:11 +01003628
Zhaolei76a8efa2015-11-17 18:46:17 +08003629 if (ro_set)
3630 btrfs_dec_block_group_ro(root, cache);
Stefan Behrensff023aa2012-11-06 11:43:11 +01003631
Arne Jansena2de7332011-03-08 14:14:00 +01003632 btrfs_put_block_group(cache);
3633 if (ret)
3634 break;
Stefan Behrensaf1be4f2012-11-27 17:39:51 +00003635 if (is_dev_replace &&
3636 atomic64_read(&dev_replace->num_write_errors) > 0) {
Stefan Behrensff023aa2012-11-06 11:43:11 +01003637 ret = -EIO;
3638 break;
3639 }
3640 if (sctx->stat.malloc_errors > 0) {
3641 ret = -ENOMEM;
3642 break;
3643 }
Arne Jansena2de7332011-03-08 14:14:00 +01003644
Ilya Dryomov539f3582013-10-07 13:42:57 +03003645 dev_replace->cursor_left = dev_replace->cursor_right;
3646 dev_replace->item_needs_writeback = 1;
Qu Wenruoced96ed2014-06-19 10:42:51 +08003647skip:
Arne Jansena2de7332011-03-08 14:14:00 +01003648 key.offset = found_key.offset + length;
Chris Mason71267332011-05-23 06:30:52 -04003649 btrfs_release_path(path);
Arne Jansena2de7332011-03-08 14:14:00 +01003650 }
3651
Arne Jansena2de7332011-03-08 14:14:00 +01003652 btrfs_free_path(path);
Arne Jansen8c510322011-06-03 10:09:26 +02003653
Zhaolei55e3a602015-08-05 16:43:30 +08003654 return ret;
Arne Jansena2de7332011-03-08 14:14:00 +01003655}
3656
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01003657static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx,
3658 struct btrfs_device *scrub_dev)
Arne Jansena2de7332011-03-08 14:14:00 +01003659{
3660 int i;
3661 u64 bytenr;
3662 u64 gen;
3663 int ret;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01003664 struct btrfs_root *root = sctx->dev_root;
Arne Jansena2de7332011-03-08 14:14:00 +01003665
Miao Xie87533c42013-01-29 10:14:48 +00003666 if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state))
Jeff Mahoney79787ea2012-03-12 16:03:00 +01003667 return -EIO;
3668
Miao Xie5f546062014-07-24 11:37:09 +08003669 /* Seed devices of a new filesystem has their own generation. */
3670 if (scrub_dev->fs_devices != root->fs_info->fs_devices)
3671 gen = scrub_dev->generation;
3672 else
3673 gen = root->fs_info->last_trans_committed;
Arne Jansena2de7332011-03-08 14:14:00 +01003674
3675 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
3676 bytenr = btrfs_sb_offset(i);
Miao Xie935e5cc2014-09-03 21:35:33 +08003677 if (bytenr + BTRFS_SUPER_INFO_SIZE >
3678 scrub_dev->commit_total_bytes)
Arne Jansena2de7332011-03-08 14:14:00 +01003679 break;
3680
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003681 ret = scrub_pages(sctx, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr,
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01003682 scrub_dev, BTRFS_EXTENT_FLAG_SUPER, gen, i,
Stefan Behrensff023aa2012-11-06 11:43:11 +01003683 NULL, 1, bytenr);
Arne Jansena2de7332011-03-08 14:14:00 +01003684 if (ret)
3685 return ret;
3686 }
Stefan Behrensb6bfebc2012-11-02 16:44:58 +01003687 wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0);
Arne Jansena2de7332011-03-08 14:14:00 +01003688
3689 return 0;
3690}
3691
3692/*
3693 * get a reference count on fs_info->scrub_workers. start worker if necessary
3694 */
Stefan Behrensff023aa2012-11-06 11:43:11 +01003695static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info,
3696 int is_dev_replace)
Arne Jansena2de7332011-03-08 14:14:00 +01003697{
David Sterba6f011052015-02-16 18:34:01 +01003698 unsigned int flags = WQ_FREEZABLE | WQ_UNBOUND;
Qu Wenruo0339ef22014-02-28 10:46:17 +08003699 int max_active = fs_info->thread_pool_size;
Arne Jansena2de7332011-03-08 14:14:00 +01003700
Arne Jansen632dd772011-06-10 12:07:07 +02003701 if (fs_info->scrub_workers_refcnt == 0) {
Stefan Behrensff023aa2012-11-06 11:43:11 +01003702 if (is_dev_replace)
Qu Wenruo0339ef22014-02-28 10:46:17 +08003703 fs_info->scrub_workers =
3704 btrfs_alloc_workqueue("btrfs-scrub", flags,
3705 1, 4);
Stefan Behrensff023aa2012-11-06 11:43:11 +01003706 else
Qu Wenruo0339ef22014-02-28 10:46:17 +08003707 fs_info->scrub_workers =
3708 btrfs_alloc_workqueue("btrfs-scrub", flags,
3709 max_active, 4);
Zhao Leie82afc52015-06-12 20:36:58 +08003710 if (!fs_info->scrub_workers)
3711 goto fail_scrub_workers;
3712
Qu Wenruo0339ef22014-02-28 10:46:17 +08003713 fs_info->scrub_wr_completion_workers =
3714 btrfs_alloc_workqueue("btrfs-scrubwrc", flags,
3715 max_active, 2);
Zhao Leie82afc52015-06-12 20:36:58 +08003716 if (!fs_info->scrub_wr_completion_workers)
3717 goto fail_scrub_wr_completion_workers;
3718
Qu Wenruo0339ef22014-02-28 10:46:17 +08003719 fs_info->scrub_nocow_workers =
3720 btrfs_alloc_workqueue("btrfs-scrubnc", flags, 1, 0);
Zhao Leie82afc52015-06-12 20:36:58 +08003721 if (!fs_info->scrub_nocow_workers)
3722 goto fail_scrub_nocow_workers;
Zhao Lei20b2e302015-06-04 20:09:15 +08003723 fs_info->scrub_parity_workers =
3724 btrfs_alloc_workqueue("btrfs-scrubparity", flags,
3725 max_active, 2);
Zhao Leie82afc52015-06-12 20:36:58 +08003726 if (!fs_info->scrub_parity_workers)
3727 goto fail_scrub_parity_workers;
Arne Jansen632dd772011-06-10 12:07:07 +02003728 }
Arne Jansena2de7332011-03-08 14:14:00 +01003729 ++fs_info->scrub_workers_refcnt;
Zhao Leie82afc52015-06-12 20:36:58 +08003730 return 0;
3731
3732fail_scrub_parity_workers:
3733 btrfs_destroy_workqueue(fs_info->scrub_nocow_workers);
3734fail_scrub_nocow_workers:
3735 btrfs_destroy_workqueue(fs_info->scrub_wr_completion_workers);
3736fail_scrub_wr_completion_workers:
3737 btrfs_destroy_workqueue(fs_info->scrub_workers);
3738fail_scrub_workers:
3739 return -ENOMEM;
Arne Jansena2de7332011-03-08 14:14:00 +01003740}
3741
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01003742static noinline_for_stack void scrub_workers_put(struct btrfs_fs_info *fs_info)
Arne Jansena2de7332011-03-08 14:14:00 +01003743{
Stefan Behrensff023aa2012-11-06 11:43:11 +01003744 if (--fs_info->scrub_workers_refcnt == 0) {
Qu Wenruo0339ef22014-02-28 10:46:17 +08003745 btrfs_destroy_workqueue(fs_info->scrub_workers);
3746 btrfs_destroy_workqueue(fs_info->scrub_wr_completion_workers);
3747 btrfs_destroy_workqueue(fs_info->scrub_nocow_workers);
Zhao Lei20b2e302015-06-04 20:09:15 +08003748 btrfs_destroy_workqueue(fs_info->scrub_parity_workers);
Stefan Behrensff023aa2012-11-06 11:43:11 +01003749 }
Arne Jansena2de7332011-03-08 14:14:00 +01003750 WARN_ON(fs_info->scrub_workers_refcnt < 0);
Arne Jansena2de7332011-03-08 14:14:00 +01003751}
3752
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01003753int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3754 u64 end, struct btrfs_scrub_progress *progress,
Stefan Behrens63a212a2012-11-05 18:29:28 +01003755 int readonly, int is_dev_replace)
Arne Jansena2de7332011-03-08 14:14:00 +01003756{
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003757 struct scrub_ctx *sctx;
Arne Jansena2de7332011-03-08 14:14:00 +01003758 int ret;
3759 struct btrfs_device *dev;
Miao Xie5d68da32014-07-24 11:37:07 +08003760 struct rcu_string *name;
Arne Jansena2de7332011-03-08 14:14:00 +01003761
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01003762 if (btrfs_fs_closing(fs_info))
Arne Jansena2de7332011-03-08 14:14:00 +01003763 return -EINVAL;
3764
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01003765 if (fs_info->chunk_root->nodesize > BTRFS_STRIPE_LEN) {
Stefan Behrensb5d67f62012-03-27 14:21:27 -04003766 /*
3767 * in this case scrub is unable to calculate the checksum
3768 * the way scrub is implemented. Do not handle this
3769 * situation at all because it won't ever happen.
3770 */
Frank Holtonefe120a2013-12-20 11:37:06 -05003771 btrfs_err(fs_info,
3772 "scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails",
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01003773 fs_info->chunk_root->nodesize, BTRFS_STRIPE_LEN);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04003774 return -EINVAL;
3775 }
3776
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01003777 if (fs_info->chunk_root->sectorsize != PAGE_SIZE) {
Stefan Behrensb5d67f62012-03-27 14:21:27 -04003778 /* not supported for data w/o checksums */
Frank Holtonefe120a2013-12-20 11:37:06 -05003779 btrfs_err(fs_info,
3780 "scrub: size assumption sectorsize != PAGE_SIZE "
3781 "(%d != %lu) fails",
Geert Uytterhoeven27f9f022013-08-20 13:20:09 +02003782 fs_info->chunk_root->sectorsize, PAGE_SIZE);
Arne Jansena2de7332011-03-08 14:14:00 +01003783 return -EINVAL;
3784 }
3785
Stefan Behrens7a9e9982012-11-02 14:58:04 +01003786 if (fs_info->chunk_root->nodesize >
3787 PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK ||
3788 fs_info->chunk_root->sectorsize >
3789 PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK) {
3790 /*
3791 * would exhaust the array bounds of pagev member in
3792 * struct scrub_block
3793 */
Frank Holtonefe120a2013-12-20 11:37:06 -05003794 btrfs_err(fs_info, "scrub: size assumption nodesize and sectorsize "
3795 "<= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails",
Stefan Behrens7a9e9982012-11-02 14:58:04 +01003796 fs_info->chunk_root->nodesize,
3797 SCRUB_MAX_PAGES_PER_BLOCK,
3798 fs_info->chunk_root->sectorsize,
3799 SCRUB_MAX_PAGES_PER_BLOCK);
3800 return -EINVAL;
3801 }
3802
Arne Jansena2de7332011-03-08 14:14:00 +01003803
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01003804 mutex_lock(&fs_info->fs_devices->device_list_mutex);
3805 dev = btrfs_find_device(fs_info, devid, NULL, NULL);
Stefan Behrens63a212a2012-11-05 18:29:28 +01003806 if (!dev || (dev->missing && !is_dev_replace)) {
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01003807 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
Arne Jansena2de7332011-03-08 14:14:00 +01003808 return -ENODEV;
3809 }
Arne Jansena2de7332011-03-08 14:14:00 +01003810
Miao Xie5d68da32014-07-24 11:37:07 +08003811 if (!is_dev_replace && !readonly && !dev->writeable) {
3812 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3813 rcu_read_lock();
3814 name = rcu_dereference(dev->name);
3815 btrfs_err(fs_info, "scrub: device %s is not writable",
3816 name->str);
3817 rcu_read_unlock();
3818 return -EROFS;
3819 }
3820
Wang Shilong3b7a0162013-10-12 02:11:12 +08003821 mutex_lock(&fs_info->scrub_lock);
Stefan Behrens63a212a2012-11-05 18:29:28 +01003822 if (!dev->in_fs_metadata || dev->is_tgtdev_for_dev_replace) {
Arne Jansena2de7332011-03-08 14:14:00 +01003823 mutex_unlock(&fs_info->scrub_lock);
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01003824 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01003825 return -EIO;
Arne Jansena2de7332011-03-08 14:14:00 +01003826 }
3827
Stefan Behrens8dabb742012-11-06 13:15:27 +01003828 btrfs_dev_replace_lock(&fs_info->dev_replace);
3829 if (dev->scrub_device ||
3830 (!is_dev_replace &&
3831 btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) {
3832 btrfs_dev_replace_unlock(&fs_info->dev_replace);
Arne Jansena2de7332011-03-08 14:14:00 +01003833 mutex_unlock(&fs_info->scrub_lock);
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01003834 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
Arne Jansena2de7332011-03-08 14:14:00 +01003835 return -EINPROGRESS;
3836 }
Stefan Behrens8dabb742012-11-06 13:15:27 +01003837 btrfs_dev_replace_unlock(&fs_info->dev_replace);
Wang Shilong3b7a0162013-10-12 02:11:12 +08003838
3839 ret = scrub_workers_get(fs_info, is_dev_replace);
3840 if (ret) {
3841 mutex_unlock(&fs_info->scrub_lock);
3842 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3843 return ret;
3844 }
3845
Stefan Behrens63a212a2012-11-05 18:29:28 +01003846 sctx = scrub_setup_ctx(dev, is_dev_replace);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003847 if (IS_ERR(sctx)) {
Arne Jansena2de7332011-03-08 14:14:00 +01003848 mutex_unlock(&fs_info->scrub_lock);
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01003849 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3850 scrub_workers_put(fs_info);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003851 return PTR_ERR(sctx);
Arne Jansena2de7332011-03-08 14:14:00 +01003852 }
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003853 sctx->readonly = readonly;
3854 dev->scrub_device = sctx;
Wang Shilong3cb09292013-12-04 21:15:19 +08003855 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
Arne Jansena2de7332011-03-08 14:14:00 +01003856
Wang Shilong3cb09292013-12-04 21:15:19 +08003857 /*
3858 * checking @scrub_pause_req here, we can avoid
3859 * race between committing transaction and scrubbing.
3860 */
Wang Shilongcb7ab022013-12-04 21:16:53 +08003861 __scrub_blocked_if_needed(fs_info);
Arne Jansena2de7332011-03-08 14:14:00 +01003862 atomic_inc(&fs_info->scrubs_running);
3863 mutex_unlock(&fs_info->scrub_lock);
Arne Jansena2de7332011-03-08 14:14:00 +01003864
Stefan Behrensff023aa2012-11-06 11:43:11 +01003865 if (!is_dev_replace) {
Wang Shilong9b011ad2013-10-25 19:12:02 +08003866 /*
3867 * by holding device list mutex, we can
3868 * kick off writing super in log tree sync.
3869 */
Wang Shilong3cb09292013-12-04 21:15:19 +08003870 mutex_lock(&fs_info->fs_devices->device_list_mutex);
Stefan Behrensff023aa2012-11-06 11:43:11 +01003871 ret = scrub_supers(sctx, dev);
Wang Shilong3cb09292013-12-04 21:15:19 +08003872 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
Stefan Behrensff023aa2012-11-06 11:43:11 +01003873 }
Arne Jansena2de7332011-03-08 14:14:00 +01003874
3875 if (!ret)
Stefan Behrensff023aa2012-11-06 11:43:11 +01003876 ret = scrub_enumerate_chunks(sctx, dev, start, end,
3877 is_dev_replace);
Arne Jansena2de7332011-03-08 14:14:00 +01003878
Stefan Behrensb6bfebc2012-11-02 16:44:58 +01003879 wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0);
Arne Jansena2de7332011-03-08 14:14:00 +01003880 atomic_dec(&fs_info->scrubs_running);
3881 wake_up(&fs_info->scrub_pause_wait);
3882
Stefan Behrensb6bfebc2012-11-02 16:44:58 +01003883 wait_event(sctx->list_wait, atomic_read(&sctx->workers_pending) == 0);
Jan Schmidt0ef8e452011-06-13 20:04:15 +02003884
Arne Jansena2de7332011-03-08 14:14:00 +01003885 if (progress)
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003886 memcpy(progress, &sctx->stat, sizeof(*progress));
Arne Jansena2de7332011-03-08 14:14:00 +01003887
3888 mutex_lock(&fs_info->scrub_lock);
3889 dev->scrub_device = NULL;
Wang Shilong3b7a0162013-10-12 02:11:12 +08003890 scrub_workers_put(fs_info);
Arne Jansena2de7332011-03-08 14:14:00 +01003891 mutex_unlock(&fs_info->scrub_lock);
3892
Filipe Mananaf55985f2015-02-09 21:14:24 +00003893 scrub_put_ctx(sctx);
Arne Jansena2de7332011-03-08 14:14:00 +01003894
3895 return ret;
3896}
3897
Jeff Mahoney143bede2012-03-01 14:56:26 +01003898void btrfs_scrub_pause(struct btrfs_root *root)
Arne Jansena2de7332011-03-08 14:14:00 +01003899{
3900 struct btrfs_fs_info *fs_info = root->fs_info;
3901
3902 mutex_lock(&fs_info->scrub_lock);
3903 atomic_inc(&fs_info->scrub_pause_req);
3904 while (atomic_read(&fs_info->scrubs_paused) !=
3905 atomic_read(&fs_info->scrubs_running)) {
3906 mutex_unlock(&fs_info->scrub_lock);
3907 wait_event(fs_info->scrub_pause_wait,
3908 atomic_read(&fs_info->scrubs_paused) ==
3909 atomic_read(&fs_info->scrubs_running));
3910 mutex_lock(&fs_info->scrub_lock);
3911 }
3912 mutex_unlock(&fs_info->scrub_lock);
Arne Jansena2de7332011-03-08 14:14:00 +01003913}
3914
Jeff Mahoney143bede2012-03-01 14:56:26 +01003915void btrfs_scrub_continue(struct btrfs_root *root)
Arne Jansena2de7332011-03-08 14:14:00 +01003916{
3917 struct btrfs_fs_info *fs_info = root->fs_info;
3918
3919 atomic_dec(&fs_info->scrub_pause_req);
3920 wake_up(&fs_info->scrub_pause_wait);
Arne Jansena2de7332011-03-08 14:14:00 +01003921}
3922
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01003923int btrfs_scrub_cancel(struct btrfs_fs_info *fs_info)
Arne Jansena2de7332011-03-08 14:14:00 +01003924{
Arne Jansena2de7332011-03-08 14:14:00 +01003925 mutex_lock(&fs_info->scrub_lock);
3926 if (!atomic_read(&fs_info->scrubs_running)) {
3927 mutex_unlock(&fs_info->scrub_lock);
3928 return -ENOTCONN;
3929 }
3930
3931 atomic_inc(&fs_info->scrub_cancel_req);
3932 while (atomic_read(&fs_info->scrubs_running)) {
3933 mutex_unlock(&fs_info->scrub_lock);
3934 wait_event(fs_info->scrub_pause_wait,
3935 atomic_read(&fs_info->scrubs_running) == 0);
3936 mutex_lock(&fs_info->scrub_lock);
3937 }
3938 atomic_dec(&fs_info->scrub_cancel_req);
3939 mutex_unlock(&fs_info->scrub_lock);
3940
3941 return 0;
3942}
3943
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01003944int btrfs_scrub_cancel_dev(struct btrfs_fs_info *fs_info,
3945 struct btrfs_device *dev)
Jeff Mahoney49b25e02012-03-01 17:24:58 +01003946{
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003947 struct scrub_ctx *sctx;
Arne Jansena2de7332011-03-08 14:14:00 +01003948
3949 mutex_lock(&fs_info->scrub_lock);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003950 sctx = dev->scrub_device;
3951 if (!sctx) {
Arne Jansena2de7332011-03-08 14:14:00 +01003952 mutex_unlock(&fs_info->scrub_lock);
3953 return -ENOTCONN;
3954 }
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003955 atomic_inc(&sctx->cancel_req);
Arne Jansena2de7332011-03-08 14:14:00 +01003956 while (dev->scrub_device) {
3957 mutex_unlock(&fs_info->scrub_lock);
3958 wait_event(fs_info->scrub_pause_wait,
3959 dev->scrub_device == NULL);
3960 mutex_lock(&fs_info->scrub_lock);
3961 }
3962 mutex_unlock(&fs_info->scrub_lock);
3963
3964 return 0;
3965}
Stefan Behrens1623ede2012-03-27 14:21:26 -04003966
Arne Jansena2de7332011-03-08 14:14:00 +01003967int btrfs_scrub_progress(struct btrfs_root *root, u64 devid,
3968 struct btrfs_scrub_progress *progress)
3969{
3970 struct btrfs_device *dev;
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003971 struct scrub_ctx *sctx = NULL;
Arne Jansena2de7332011-03-08 14:14:00 +01003972
3973 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01003974 dev = btrfs_find_device(root->fs_info, devid, NULL, NULL);
Arne Jansena2de7332011-03-08 14:14:00 +01003975 if (dev)
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003976 sctx = dev->scrub_device;
3977 if (sctx)
3978 memcpy(progress, &sctx->stat, sizeof(*progress));
Arne Jansena2de7332011-03-08 14:14:00 +01003979 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
3980
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003981 return dev ? (sctx ? 0 : -ENOTCONN) : -ENODEV;
Arne Jansena2de7332011-03-08 14:14:00 +01003982}
Stefan Behrensff023aa2012-11-06 11:43:11 +01003983
3984static void scrub_remap_extent(struct btrfs_fs_info *fs_info,
3985 u64 extent_logical, u64 extent_len,
3986 u64 *extent_physical,
3987 struct btrfs_device **extent_dev,
3988 int *extent_mirror_num)
3989{
3990 u64 mapped_length;
3991 struct btrfs_bio *bbio = NULL;
3992 int ret;
3993
3994 mapped_length = extent_len;
3995 ret = btrfs_map_block(fs_info, READ, extent_logical,
3996 &mapped_length, &bbio, 0);
3997 if (ret || !bbio || mapped_length < extent_len ||
3998 !bbio->stripes[0].dev->bdev) {
Zhao Lei6e9606d2015-01-20 15:11:34 +08003999 btrfs_put_bbio(bbio);
Stefan Behrensff023aa2012-11-06 11:43:11 +01004000 return;
4001 }
4002
4003 *extent_physical = bbio->stripes[0].physical;
4004 *extent_mirror_num = bbio->mirror_num;
4005 *extent_dev = bbio->stripes[0].dev;
Zhao Lei6e9606d2015-01-20 15:11:34 +08004006 btrfs_put_bbio(bbio);
Stefan Behrensff023aa2012-11-06 11:43:11 +01004007}
4008
4009static int scrub_setup_wr_ctx(struct scrub_ctx *sctx,
4010 struct scrub_wr_ctx *wr_ctx,
4011 struct btrfs_fs_info *fs_info,
4012 struct btrfs_device *dev,
4013 int is_dev_replace)
4014{
4015 WARN_ON(wr_ctx->wr_curr_bio != NULL);
4016
4017 mutex_init(&wr_ctx->wr_lock);
4018 wr_ctx->wr_curr_bio = NULL;
4019 if (!is_dev_replace)
4020 return 0;
4021
4022 WARN_ON(!dev->bdev);
Kent Overstreetb54ffb72015-05-19 14:31:01 +02004023 wr_ctx->pages_per_wr_bio = SCRUB_PAGES_PER_WR_BIO;
Stefan Behrensff023aa2012-11-06 11:43:11 +01004024 wr_ctx->tgtdev = dev;
4025 atomic_set(&wr_ctx->flush_all_writes, 0);
4026 return 0;
4027}
4028
4029static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx)
4030{
4031 mutex_lock(&wr_ctx->wr_lock);
4032 kfree(wr_ctx->wr_curr_bio);
4033 wr_ctx->wr_curr_bio = NULL;
4034 mutex_unlock(&wr_ctx->wr_lock);
4035}
4036
4037static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
4038 int mirror_num, u64 physical_for_dev_replace)
4039{
4040 struct scrub_copy_nocow_ctx *nocow_ctx;
4041 struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
4042
4043 nocow_ctx = kzalloc(sizeof(*nocow_ctx), GFP_NOFS);
4044 if (!nocow_ctx) {
4045 spin_lock(&sctx->stat_lock);
4046 sctx->stat.malloc_errors++;
4047 spin_unlock(&sctx->stat_lock);
4048 return -ENOMEM;
4049 }
4050
4051 scrub_pending_trans_workers_inc(sctx);
4052
4053 nocow_ctx->sctx = sctx;
4054 nocow_ctx->logical = logical;
4055 nocow_ctx->len = len;
4056 nocow_ctx->mirror_num = mirror_num;
4057 nocow_ctx->physical_for_dev_replace = physical_for_dev_replace;
Liu Bo9e0af232014-08-15 23:36:53 +08004058 btrfs_init_work(&nocow_ctx->work, btrfs_scrubnc_helper,
4059 copy_nocow_pages_worker, NULL, NULL);
Josef Bacik652f25a2013-09-12 16:58:28 -04004060 INIT_LIST_HEAD(&nocow_ctx->inodes);
Qu Wenruo0339ef22014-02-28 10:46:17 +08004061 btrfs_queue_work(fs_info->scrub_nocow_workers,
4062 &nocow_ctx->work);
Stefan Behrensff023aa2012-11-06 11:43:11 +01004063
4064 return 0;
4065}
4066
Josef Bacik652f25a2013-09-12 16:58:28 -04004067static int record_inode_for_nocow(u64 inum, u64 offset, u64 root, void *ctx)
4068{
4069 struct scrub_copy_nocow_ctx *nocow_ctx = ctx;
4070 struct scrub_nocow_inode *nocow_inode;
4071
4072 nocow_inode = kzalloc(sizeof(*nocow_inode), GFP_NOFS);
4073 if (!nocow_inode)
4074 return -ENOMEM;
4075 nocow_inode->inum = inum;
4076 nocow_inode->offset = offset;
4077 nocow_inode->root = root;
4078 list_add_tail(&nocow_inode->list, &nocow_ctx->inodes);
4079 return 0;
4080}
4081
4082#define COPY_COMPLETE 1
4083
Stefan Behrensff023aa2012-11-06 11:43:11 +01004084static void copy_nocow_pages_worker(struct btrfs_work *work)
4085{
4086 struct scrub_copy_nocow_ctx *nocow_ctx =
4087 container_of(work, struct scrub_copy_nocow_ctx, work);
4088 struct scrub_ctx *sctx = nocow_ctx->sctx;
4089 u64 logical = nocow_ctx->logical;
4090 u64 len = nocow_ctx->len;
4091 int mirror_num = nocow_ctx->mirror_num;
4092 u64 physical_for_dev_replace = nocow_ctx->physical_for_dev_replace;
4093 int ret;
4094 struct btrfs_trans_handle *trans = NULL;
4095 struct btrfs_fs_info *fs_info;
4096 struct btrfs_path *path;
4097 struct btrfs_root *root;
4098 int not_written = 0;
4099
4100 fs_info = sctx->dev_root->fs_info;
4101 root = fs_info->extent_root;
4102
4103 path = btrfs_alloc_path();
4104 if (!path) {
4105 spin_lock(&sctx->stat_lock);
4106 sctx->stat.malloc_errors++;
4107 spin_unlock(&sctx->stat_lock);
4108 not_written = 1;
4109 goto out;
4110 }
4111
4112 trans = btrfs_join_transaction(root);
4113 if (IS_ERR(trans)) {
4114 not_written = 1;
4115 goto out;
4116 }
4117
4118 ret = iterate_inodes_from_logical(logical, fs_info, path,
Josef Bacik652f25a2013-09-12 16:58:28 -04004119 record_inode_for_nocow, nocow_ctx);
Stefan Behrensff023aa2012-11-06 11:43:11 +01004120 if (ret != 0 && ret != -ENOENT) {
Frank Holtonefe120a2013-12-20 11:37:06 -05004121 btrfs_warn(fs_info, "iterate_inodes_from_logical() failed: log %llu, "
4122 "phys %llu, len %llu, mir %u, ret %d",
Geert Uytterhoeven118a0a22013-08-20 13:20:10 +02004123 logical, physical_for_dev_replace, len, mirror_num,
4124 ret);
Stefan Behrensff023aa2012-11-06 11:43:11 +01004125 not_written = 1;
4126 goto out;
4127 }
4128
Josef Bacik652f25a2013-09-12 16:58:28 -04004129 btrfs_end_transaction(trans, root);
4130 trans = NULL;
4131 while (!list_empty(&nocow_ctx->inodes)) {
4132 struct scrub_nocow_inode *entry;
4133 entry = list_first_entry(&nocow_ctx->inodes,
4134 struct scrub_nocow_inode,
4135 list);
4136 list_del_init(&entry->list);
4137 ret = copy_nocow_pages_for_inode(entry->inum, entry->offset,
4138 entry->root, nocow_ctx);
4139 kfree(entry);
4140 if (ret == COPY_COMPLETE) {
4141 ret = 0;
4142 break;
4143 } else if (ret) {
4144 break;
4145 }
4146 }
Stefan Behrensff023aa2012-11-06 11:43:11 +01004147out:
Josef Bacik652f25a2013-09-12 16:58:28 -04004148 while (!list_empty(&nocow_ctx->inodes)) {
4149 struct scrub_nocow_inode *entry;
4150 entry = list_first_entry(&nocow_ctx->inodes,
4151 struct scrub_nocow_inode,
4152 list);
4153 list_del_init(&entry->list);
4154 kfree(entry);
4155 }
Stefan Behrensff023aa2012-11-06 11:43:11 +01004156 if (trans && !IS_ERR(trans))
4157 btrfs_end_transaction(trans, root);
4158 if (not_written)
4159 btrfs_dev_replace_stats_inc(&fs_info->dev_replace.
4160 num_uncorrectable_read_errors);
4161
4162 btrfs_free_path(path);
4163 kfree(nocow_ctx);
4164
4165 scrub_pending_trans_workers_dec(sctx);
4166}
4167
Gui Hecheng32159242014-11-10 15:36:08 +08004168static int check_extent_to_block(struct inode *inode, u64 start, u64 len,
4169 u64 logical)
4170{
4171 struct extent_state *cached_state = NULL;
4172 struct btrfs_ordered_extent *ordered;
4173 struct extent_io_tree *io_tree;
4174 struct extent_map *em;
4175 u64 lockstart = start, lockend = start + len - 1;
4176 int ret = 0;
4177
4178 io_tree = &BTRFS_I(inode)->io_tree;
4179
4180 lock_extent_bits(io_tree, lockstart, lockend, 0, &cached_state);
4181 ordered = btrfs_lookup_ordered_range(inode, lockstart, len);
4182 if (ordered) {
4183 btrfs_put_ordered_extent(ordered);
4184 ret = 1;
4185 goto out_unlock;
4186 }
4187
4188 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
4189 if (IS_ERR(em)) {
4190 ret = PTR_ERR(em);
4191 goto out_unlock;
4192 }
4193
4194 /*
4195 * This extent does not actually cover the logical extent anymore,
4196 * move on to the next inode.
4197 */
4198 if (em->block_start > logical ||
4199 em->block_start + em->block_len < logical + len) {
4200 free_extent_map(em);
4201 ret = 1;
4202 goto out_unlock;
4203 }
4204 free_extent_map(em);
4205
4206out_unlock:
4207 unlock_extent_cached(io_tree, lockstart, lockend, &cached_state,
4208 GFP_NOFS);
4209 return ret;
4210}
4211
Josef Bacik652f25a2013-09-12 16:58:28 -04004212static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root,
4213 struct scrub_copy_nocow_ctx *nocow_ctx)
Stefan Behrensff023aa2012-11-06 11:43:11 +01004214{
Miao Xie826aa0a2013-06-27 18:50:59 +08004215 struct btrfs_fs_info *fs_info = nocow_ctx->sctx->dev_root->fs_info;
Stefan Behrensff023aa2012-11-06 11:43:11 +01004216 struct btrfs_key key;
Miao Xie826aa0a2013-06-27 18:50:59 +08004217 struct inode *inode;
4218 struct page *page;
Stefan Behrensff023aa2012-11-06 11:43:11 +01004219 struct btrfs_root *local_root;
Josef Bacik652f25a2013-09-12 16:58:28 -04004220 struct extent_io_tree *io_tree;
Stefan Behrensff023aa2012-11-06 11:43:11 +01004221 u64 physical_for_dev_replace;
Gui Hecheng32159242014-11-10 15:36:08 +08004222 u64 nocow_ctx_logical;
Josef Bacik652f25a2013-09-12 16:58:28 -04004223 u64 len = nocow_ctx->len;
Miao Xie826aa0a2013-06-27 18:50:59 +08004224 unsigned long index;
Liu Bo6f1c3602013-01-29 03:22:10 +00004225 int srcu_index;
Josef Bacik652f25a2013-09-12 16:58:28 -04004226 int ret = 0;
4227 int err = 0;
Stefan Behrensff023aa2012-11-06 11:43:11 +01004228
4229 key.objectid = root;
4230 key.type = BTRFS_ROOT_ITEM_KEY;
4231 key.offset = (u64)-1;
Liu Bo6f1c3602013-01-29 03:22:10 +00004232
4233 srcu_index = srcu_read_lock(&fs_info->subvol_srcu);
4234
Stefan Behrensff023aa2012-11-06 11:43:11 +01004235 local_root = btrfs_read_fs_root_no_name(fs_info, &key);
Liu Bo6f1c3602013-01-29 03:22:10 +00004236 if (IS_ERR(local_root)) {
4237 srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
Stefan Behrensff023aa2012-11-06 11:43:11 +01004238 return PTR_ERR(local_root);
Liu Bo6f1c3602013-01-29 03:22:10 +00004239 }
Stefan Behrensff023aa2012-11-06 11:43:11 +01004240
4241 key.type = BTRFS_INODE_ITEM_KEY;
4242 key.objectid = inum;
4243 key.offset = 0;
4244 inode = btrfs_iget(fs_info->sb, &key, local_root, NULL);
Liu Bo6f1c3602013-01-29 03:22:10 +00004245 srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
Stefan Behrensff023aa2012-11-06 11:43:11 +01004246 if (IS_ERR(inode))
4247 return PTR_ERR(inode);
4248
Miao Xieedd14002013-06-27 18:51:00 +08004249 /* Avoid truncate/dio/punch hole.. */
4250 mutex_lock(&inode->i_mutex);
4251 inode_dio_wait(inode);
4252
Stefan Behrensff023aa2012-11-06 11:43:11 +01004253 physical_for_dev_replace = nocow_ctx->physical_for_dev_replace;
Josef Bacik652f25a2013-09-12 16:58:28 -04004254 io_tree = &BTRFS_I(inode)->io_tree;
Gui Hecheng32159242014-11-10 15:36:08 +08004255 nocow_ctx_logical = nocow_ctx->logical;
Josef Bacik652f25a2013-09-12 16:58:28 -04004256
Gui Hecheng32159242014-11-10 15:36:08 +08004257 ret = check_extent_to_block(inode, offset, len, nocow_ctx_logical);
4258 if (ret) {
4259 ret = ret > 0 ? 0 : ret;
4260 goto out;
Josef Bacik652f25a2013-09-12 16:58:28 -04004261 }
4262
Stefan Behrensff023aa2012-11-06 11:43:11 +01004263 while (len >= PAGE_CACHE_SIZE) {
Stefan Behrensff023aa2012-11-06 11:43:11 +01004264 index = offset >> PAGE_CACHE_SHIFT;
Miao Xieedd14002013-06-27 18:51:00 +08004265again:
Stefan Behrensff023aa2012-11-06 11:43:11 +01004266 page = find_or_create_page(inode->i_mapping, index, GFP_NOFS);
4267 if (!page) {
Frank Holtonefe120a2013-12-20 11:37:06 -05004268 btrfs_err(fs_info, "find_or_create_page() failed");
Stefan Behrensff023aa2012-11-06 11:43:11 +01004269 ret = -ENOMEM;
Miao Xie826aa0a2013-06-27 18:50:59 +08004270 goto out;
Stefan Behrensff023aa2012-11-06 11:43:11 +01004271 }
4272
4273 if (PageUptodate(page)) {
4274 if (PageDirty(page))
4275 goto next_page;
4276 } else {
4277 ClearPageError(page);
Gui Hecheng32159242014-11-10 15:36:08 +08004278 err = extent_read_full_page(io_tree, page,
Josef Bacik652f25a2013-09-12 16:58:28 -04004279 btrfs_get_extent,
4280 nocow_ctx->mirror_num);
Miao Xie826aa0a2013-06-27 18:50:59 +08004281 if (err) {
4282 ret = err;
Stefan Behrensff023aa2012-11-06 11:43:11 +01004283 goto next_page;
4284 }
Miao Xieedd14002013-06-27 18:51:00 +08004285
Miao Xie26b25892013-06-27 18:50:58 +08004286 lock_page(page);
Miao Xieedd14002013-06-27 18:51:00 +08004287 /*
4288 * If the page has been remove from the page cache,
4289 * the data on it is meaningless, because it may be
4290 * old one, the new data may be written into the new
4291 * page in the page cache.
4292 */
4293 if (page->mapping != inode->i_mapping) {
Josef Bacik652f25a2013-09-12 16:58:28 -04004294 unlock_page(page);
Miao Xieedd14002013-06-27 18:51:00 +08004295 page_cache_release(page);
4296 goto again;
4297 }
Stefan Behrensff023aa2012-11-06 11:43:11 +01004298 if (!PageUptodate(page)) {
4299 ret = -EIO;
4300 goto next_page;
4301 }
4302 }
Gui Hecheng32159242014-11-10 15:36:08 +08004303
4304 ret = check_extent_to_block(inode, offset, len,
4305 nocow_ctx_logical);
4306 if (ret) {
4307 ret = ret > 0 ? 0 : ret;
4308 goto next_page;
4309 }
4310
Miao Xie826aa0a2013-06-27 18:50:59 +08004311 err = write_page_nocow(nocow_ctx->sctx,
4312 physical_for_dev_replace, page);
4313 if (err)
4314 ret = err;
Stefan Behrensff023aa2012-11-06 11:43:11 +01004315next_page:
Miao Xie826aa0a2013-06-27 18:50:59 +08004316 unlock_page(page);
4317 page_cache_release(page);
4318
4319 if (ret)
4320 break;
4321
Stefan Behrensff023aa2012-11-06 11:43:11 +01004322 offset += PAGE_CACHE_SIZE;
4323 physical_for_dev_replace += PAGE_CACHE_SIZE;
Gui Hecheng32159242014-11-10 15:36:08 +08004324 nocow_ctx_logical += PAGE_CACHE_SIZE;
Stefan Behrensff023aa2012-11-06 11:43:11 +01004325 len -= PAGE_CACHE_SIZE;
4326 }
Josef Bacik652f25a2013-09-12 16:58:28 -04004327 ret = COPY_COMPLETE;
Miao Xie826aa0a2013-06-27 18:50:59 +08004328out:
Miao Xieedd14002013-06-27 18:51:00 +08004329 mutex_unlock(&inode->i_mutex);
Miao Xie826aa0a2013-06-27 18:50:59 +08004330 iput(inode);
Stefan Behrensff023aa2012-11-06 11:43:11 +01004331 return ret;
4332}
4333
4334static int write_page_nocow(struct scrub_ctx *sctx,
4335 u64 physical_for_dev_replace, struct page *page)
4336{
4337 struct bio *bio;
4338 struct btrfs_device *dev;
4339 int ret;
Stefan Behrensff023aa2012-11-06 11:43:11 +01004340
4341 dev = sctx->wr_ctx.tgtdev;
4342 if (!dev)
4343 return -EIO;
4344 if (!dev->bdev) {
David Sterba94647322015-10-08 11:01:36 +02004345 btrfs_warn_rl(dev->dev_root->fs_info,
4346 "scrub write_page_nocow(bdev == NULL) is unexpected");
Stefan Behrensff023aa2012-11-06 11:43:11 +01004347 return -EIO;
4348 }
Chris Mason9be33952013-05-17 18:30:14 -04004349 bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
Stefan Behrensff023aa2012-11-06 11:43:11 +01004350 if (!bio) {
4351 spin_lock(&sctx->stat_lock);
4352 sctx->stat.malloc_errors++;
4353 spin_unlock(&sctx->stat_lock);
4354 return -ENOMEM;
4355 }
Kent Overstreet4f024f32013-10-11 15:44:27 -07004356 bio->bi_iter.bi_size = 0;
4357 bio->bi_iter.bi_sector = physical_for_dev_replace >> 9;
Stefan Behrensff023aa2012-11-06 11:43:11 +01004358 bio->bi_bdev = dev->bdev;
4359 ret = bio_add_page(bio, page, PAGE_CACHE_SIZE, 0);
4360 if (ret != PAGE_CACHE_SIZE) {
4361leave_with_eio:
4362 bio_put(bio);
4363 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS);
4364 return -EIO;
4365 }
Stefan Behrensff023aa2012-11-06 11:43:11 +01004366
Kent Overstreet33879d42013-11-23 22:33:32 -08004367 if (btrfsic_submit_bio_wait(WRITE_SYNC, bio))
Stefan Behrensff023aa2012-11-06 11:43:11 +01004368 goto leave_with_eio;
4369
4370 bio_put(bio);
4371 return 0;
4372}