blob: efba5d1282ee40addd128cf05427181a0aade83f [file] [log] [blame]
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
66struct scrub_page {
Stefan Behrensb5d67f62012-03-27 14:21:27 -040067 struct scrub_block *sblock;
68 struct page *page;
Stefan Behrens442a4f62012-05-25 16:06:08 +020069 struct btrfs_device *dev;
Arne Jansena2de7332011-03-08 14:14:00 +010070 u64 flags; /* extent flags */
71 u64 generation;
Stefan Behrensb5d67f62012-03-27 14:21:27 -040072 u64 logical;
73 u64 physical;
Stefan Behrensff023aa2012-11-06 11:43:11 +010074 u64 physical_for_dev_replace;
Stefan Behrens7a9e9982012-11-02 14:58:04 +010075 atomic_t ref_count;
Stefan Behrensb5d67f62012-03-27 14:21:27 -040076 struct {
77 unsigned int mirror_num:8;
78 unsigned int have_csum:1;
79 unsigned int io_error:1;
80 };
Arne Jansena2de7332011-03-08 14:14:00 +010081 u8 csum[BTRFS_CSUM_SIZE];
82};
83
84struct scrub_bio {
85 int index;
Stefan Behrensd9d181c2012-11-02 09:58:09 +010086 struct scrub_ctx *sctx;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +010087 struct btrfs_device *dev;
Arne Jansena2de7332011-03-08 14:14:00 +010088 struct bio *bio;
89 int err;
90 u64 logical;
91 u64 physical;
Stefan Behrensff023aa2012-11-06 11:43:11 +010092#if SCRUB_PAGES_PER_WR_BIO >= SCRUB_PAGES_PER_RD_BIO
93 struct scrub_page *pagev[SCRUB_PAGES_PER_WR_BIO];
94#else
95 struct scrub_page *pagev[SCRUB_PAGES_PER_RD_BIO];
96#endif
Stefan Behrensb5d67f62012-03-27 14:21:27 -040097 int page_count;
Arne Jansena2de7332011-03-08 14:14:00 +010098 int next_free;
99 struct btrfs_work work;
100};
101
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400102struct scrub_block {
Stefan Behrens7a9e9982012-11-02 14:58:04 +0100103 struct scrub_page *pagev[SCRUB_MAX_PAGES_PER_BLOCK];
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400104 int page_count;
105 atomic_t outstanding_pages;
106 atomic_t ref_count; /* free mem on transition to zero */
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100107 struct scrub_ctx *sctx;
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400108 struct {
109 unsigned int header_error:1;
110 unsigned int checksum_error:1;
111 unsigned int no_io_error_seen:1;
Stefan Behrens442a4f62012-05-25 16:06:08 +0200112 unsigned int generation_error:1; /* also sets header_error */
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400113 };
114};
115
Stefan Behrensff023aa2012-11-06 11:43:11 +0100116struct scrub_wr_ctx {
117 struct scrub_bio *wr_curr_bio;
118 struct btrfs_device *tgtdev;
119 int pages_per_wr_bio; /* <= SCRUB_PAGES_PER_WR_BIO */
120 atomic_t flush_all_writes;
121 struct mutex wr_lock;
122};
123
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100124struct scrub_ctx {
Stefan Behrensff023aa2012-11-06 11:43:11 +0100125 struct scrub_bio *bios[SCRUB_BIOS_PER_SCTX];
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100126 struct btrfs_root *dev_root;
Arne Jansena2de7332011-03-08 14:14:00 +0100127 int first_free;
128 int curr;
Stefan Behrensb6bfebc2012-11-02 16:44:58 +0100129 atomic_t bios_in_flight;
130 atomic_t workers_pending;
Arne Jansena2de7332011-03-08 14:14:00 +0100131 spinlock_t list_lock;
132 wait_queue_head_t list_wait;
133 u16 csum_size;
134 struct list_head csum_list;
135 atomic_t cancel_req;
Arne Jansen86287642011-03-23 16:34:19 +0100136 int readonly;
Stefan Behrensff023aa2012-11-06 11:43:11 +0100137 int pages_per_rd_bio;
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400138 u32 sectorsize;
139 u32 nodesize;
140 u32 leafsize;
Stefan Behrens63a212a2012-11-05 18:29:28 +0100141
142 int is_dev_replace;
Stefan Behrensff023aa2012-11-06 11:43:11 +0100143 struct scrub_wr_ctx wr_ctx;
Stefan Behrens63a212a2012-11-05 18:29:28 +0100144
Arne Jansena2de7332011-03-08 14:14:00 +0100145 /*
146 * statistics
147 */
148 struct btrfs_scrub_progress stat;
149 spinlock_t stat_lock;
150};
151
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200152struct scrub_fixup_nodatasum {
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100153 struct scrub_ctx *sctx;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100154 struct btrfs_device *dev;
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200155 u64 logical;
156 struct btrfs_root *root;
157 struct btrfs_work work;
158 int mirror_num;
159};
160
Josef Bacik652f25a2013-09-12 16:58:28 -0400161struct scrub_nocow_inode {
162 u64 inum;
163 u64 offset;
164 u64 root;
165 struct list_head list;
166};
167
Stefan Behrensff023aa2012-11-06 11:43:11 +0100168struct scrub_copy_nocow_ctx {
169 struct scrub_ctx *sctx;
170 u64 logical;
171 u64 len;
172 int mirror_num;
173 u64 physical_for_dev_replace;
Josef Bacik652f25a2013-09-12 16:58:28 -0400174 struct list_head inodes;
Stefan Behrensff023aa2012-11-06 11:43:11 +0100175 struct btrfs_work work;
176};
177
Jan Schmidt558540c2011-06-13 19:59:12 +0200178struct scrub_warning {
179 struct btrfs_path *path;
180 u64 extent_item_size;
181 char *scratch_buf;
182 char *msg_buf;
183 const char *errstr;
184 sector_t sector;
185 u64 logical;
186 struct btrfs_device *dev;
187 int msg_bufsize;
188 int scratch_bufsize;
189};
190
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400191
Stefan Behrensb6bfebc2012-11-02 16:44:58 +0100192static void scrub_pending_bio_inc(struct scrub_ctx *sctx);
193static void scrub_pending_bio_dec(struct scrub_ctx *sctx);
194static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx);
195static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400196static int scrub_handle_errored_block(struct scrub_block *sblock_to_check);
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100197static int scrub_setup_recheck_block(struct scrub_ctx *sctx,
Stefan Behrens3ec706c2012-11-05 15:46:42 +0100198 struct btrfs_fs_info *fs_info,
Stefan Behrensff023aa2012-11-06 11:43:11 +0100199 struct scrub_block *original_sblock,
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400200 u64 length, u64 logical,
Stefan Behrensff023aa2012-11-06 11:43:11 +0100201 struct scrub_block *sblocks_for_recheck);
Stefan Behrens34f5c8e2012-11-02 16:16:26 +0100202static void scrub_recheck_block(struct btrfs_fs_info *fs_info,
203 struct scrub_block *sblock, int is_metadata,
204 int have_csum, u8 *csum, u64 generation,
205 u16 csum_size);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400206static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info,
207 struct scrub_block *sblock,
208 int is_metadata, int have_csum,
209 const u8 *csum, u64 generation,
210 u16 csum_size);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400211static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad,
212 struct scrub_block *sblock_good,
213 int force_write);
214static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad,
215 struct scrub_block *sblock_good,
216 int page_num, int force_write);
Stefan Behrensff023aa2012-11-06 11:43:11 +0100217static void scrub_write_block_to_dev_replace(struct scrub_block *sblock);
218static int scrub_write_page_to_dev_replace(struct scrub_block *sblock,
219 int page_num);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400220static int scrub_checksum_data(struct scrub_block *sblock);
221static int scrub_checksum_tree_block(struct scrub_block *sblock);
222static int scrub_checksum_super(struct scrub_block *sblock);
223static void scrub_block_get(struct scrub_block *sblock);
224static void scrub_block_put(struct scrub_block *sblock);
Stefan Behrens7a9e9982012-11-02 14:58:04 +0100225static void scrub_page_get(struct scrub_page *spage);
226static void scrub_page_put(struct scrub_page *spage);
Stefan Behrensff023aa2012-11-06 11:43:11 +0100227static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx,
228 struct scrub_page *spage);
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100229static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100230 u64 physical, struct btrfs_device *dev, u64 flags,
Stefan Behrensff023aa2012-11-06 11:43:11 +0100231 u64 gen, int mirror_num, u8 *csum, int force,
232 u64 physical_for_dev_replace);
Stefan Behrens1623ede2012-03-27 14:21:26 -0400233static void scrub_bio_end_io(struct bio *bio, int err);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400234static void scrub_bio_end_io_worker(struct btrfs_work *work);
235static void scrub_block_complete(struct scrub_block *sblock);
Stefan Behrensff023aa2012-11-06 11:43:11 +0100236static void scrub_remap_extent(struct btrfs_fs_info *fs_info,
237 u64 extent_logical, u64 extent_len,
238 u64 *extent_physical,
239 struct btrfs_device **extent_dev,
240 int *extent_mirror_num);
241static int scrub_setup_wr_ctx(struct scrub_ctx *sctx,
242 struct scrub_wr_ctx *wr_ctx,
243 struct btrfs_fs_info *fs_info,
244 struct btrfs_device *dev,
245 int is_dev_replace);
246static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx);
247static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx,
248 struct scrub_page *spage);
249static void scrub_wr_submit(struct scrub_ctx *sctx);
250static void scrub_wr_bio_end_io(struct bio *bio, int err);
251static void scrub_wr_bio_end_io_worker(struct btrfs_work *work);
252static int write_page_nocow(struct scrub_ctx *sctx,
253 u64 physical_for_dev_replace, struct page *page);
254static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root,
Josef Bacik652f25a2013-09-12 16:58:28 -0400255 struct scrub_copy_nocow_ctx *ctx);
Stefan Behrensff023aa2012-11-06 11:43:11 +0100256static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
257 int mirror_num, u64 physical_for_dev_replace);
258static void copy_nocow_pages_worker(struct btrfs_work *work);
Wang Shilongcb7ab022013-12-04 21:16:53 +0800259static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info);
Wang Shilong3cb09292013-12-04 21:15:19 +0800260static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info);
Stefan Behrens1623ede2012-03-27 14:21:26 -0400261
262
Stefan Behrensb6bfebc2012-11-02 16:44:58 +0100263static void scrub_pending_bio_inc(struct scrub_ctx *sctx)
264{
265 atomic_inc(&sctx->bios_in_flight);
266}
267
268static void scrub_pending_bio_dec(struct scrub_ctx *sctx)
269{
270 atomic_dec(&sctx->bios_in_flight);
271 wake_up(&sctx->list_wait);
272}
273
Wang Shilongcb7ab022013-12-04 21:16:53 +0800274static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info)
Wang Shilong3cb09292013-12-04 21:15:19 +0800275{
276 while (atomic_read(&fs_info->scrub_pause_req)) {
277 mutex_unlock(&fs_info->scrub_lock);
278 wait_event(fs_info->scrub_pause_wait,
279 atomic_read(&fs_info->scrub_pause_req) == 0);
280 mutex_lock(&fs_info->scrub_lock);
281 }
282}
283
Wang Shilongcb7ab022013-12-04 21:16:53 +0800284static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info)
285{
286 atomic_inc(&fs_info->scrubs_paused);
287 wake_up(&fs_info->scrub_pause_wait);
288
289 mutex_lock(&fs_info->scrub_lock);
290 __scrub_blocked_if_needed(fs_info);
291 atomic_dec(&fs_info->scrubs_paused);
292 mutex_unlock(&fs_info->scrub_lock);
293
294 wake_up(&fs_info->scrub_pause_wait);
295}
296
Stefan Behrensb6bfebc2012-11-02 16:44:58 +0100297/*
298 * used for workers that require transaction commits (i.e., for the
299 * NOCOW case)
300 */
301static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx)
302{
303 struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
304
305 /*
306 * increment scrubs_running to prevent cancel requests from
307 * completing as long as a worker is running. we must also
308 * increment scrubs_paused to prevent deadlocking on pause
309 * requests used for transactions commits (as the worker uses a
310 * transaction context). it is safe to regard the worker
311 * as paused for all matters practical. effectively, we only
312 * avoid cancellation requests from completing.
313 */
314 mutex_lock(&fs_info->scrub_lock);
315 atomic_inc(&fs_info->scrubs_running);
316 atomic_inc(&fs_info->scrubs_paused);
317 mutex_unlock(&fs_info->scrub_lock);
318 atomic_inc(&sctx->workers_pending);
319}
320
321/* used for workers that require transaction commits */
322static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx)
323{
324 struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
325
326 /*
327 * see scrub_pending_trans_workers_inc() why we're pretending
328 * to be paused in the scrub counters
329 */
330 mutex_lock(&fs_info->scrub_lock);
331 atomic_dec(&fs_info->scrubs_running);
332 atomic_dec(&fs_info->scrubs_paused);
333 mutex_unlock(&fs_info->scrub_lock);
334 atomic_dec(&sctx->workers_pending);
335 wake_up(&fs_info->scrub_pause_wait);
336 wake_up(&sctx->list_wait);
337}
338
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100339static void scrub_free_csums(struct scrub_ctx *sctx)
Arne Jansena2de7332011-03-08 14:14:00 +0100340{
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100341 while (!list_empty(&sctx->csum_list)) {
Arne Jansena2de7332011-03-08 14:14:00 +0100342 struct btrfs_ordered_sum *sum;
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100343 sum = list_first_entry(&sctx->csum_list,
Arne Jansena2de7332011-03-08 14:14:00 +0100344 struct btrfs_ordered_sum, list);
345 list_del(&sum->list);
346 kfree(sum);
347 }
348}
349
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100350static noinline_for_stack void scrub_free_ctx(struct scrub_ctx *sctx)
Arne Jansena2de7332011-03-08 14:14:00 +0100351{
352 int i;
Arne Jansena2de7332011-03-08 14:14:00 +0100353
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100354 if (!sctx)
Arne Jansena2de7332011-03-08 14:14:00 +0100355 return;
356
Stefan Behrensff023aa2012-11-06 11:43:11 +0100357 scrub_free_wr_ctx(&sctx->wr_ctx);
358
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400359 /* this can happen when scrub is cancelled */
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100360 if (sctx->curr != -1) {
361 struct scrub_bio *sbio = sctx->bios[sctx->curr];
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400362
363 for (i = 0; i < sbio->page_count; i++) {
Stefan Behrensff023aa2012-11-06 11:43:11 +0100364 WARN_ON(!sbio->pagev[i]->page);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400365 scrub_block_put(sbio->pagev[i]->sblock);
366 }
367 bio_put(sbio->bio);
368 }
369
Stefan Behrensff023aa2012-11-06 11:43:11 +0100370 for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100371 struct scrub_bio *sbio = sctx->bios[i];
Arne Jansena2de7332011-03-08 14:14:00 +0100372
373 if (!sbio)
374 break;
Arne Jansena2de7332011-03-08 14:14:00 +0100375 kfree(sbio);
376 }
377
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100378 scrub_free_csums(sctx);
379 kfree(sctx);
Arne Jansena2de7332011-03-08 14:14:00 +0100380}
381
382static noinline_for_stack
Stefan Behrens63a212a2012-11-05 18:29:28 +0100383struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace)
Arne Jansena2de7332011-03-08 14:14:00 +0100384{
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100385 struct scrub_ctx *sctx;
Arne Jansena2de7332011-03-08 14:14:00 +0100386 int i;
Arne Jansena2de7332011-03-08 14:14:00 +0100387 struct btrfs_fs_info *fs_info = dev->dev_root->fs_info;
Stefan Behrensff023aa2012-11-06 11:43:11 +0100388 int pages_per_rd_bio;
389 int ret;
Arne Jansena2de7332011-03-08 14:14:00 +0100390
Stefan Behrensff023aa2012-11-06 11:43:11 +0100391 /*
392 * the setting of pages_per_rd_bio is correct for scrub but might
393 * be wrong for the dev_replace code where we might read from
394 * different devices in the initial huge bios. However, that
395 * code is able to correctly handle the case when adding a page
396 * to a bio fails.
397 */
398 if (dev->bdev)
399 pages_per_rd_bio = min_t(int, SCRUB_PAGES_PER_RD_BIO,
400 bio_get_nr_vecs(dev->bdev));
401 else
402 pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO;
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100403 sctx = kzalloc(sizeof(*sctx), GFP_NOFS);
404 if (!sctx)
Arne Jansena2de7332011-03-08 14:14:00 +0100405 goto nomem;
Stefan Behrens63a212a2012-11-05 18:29:28 +0100406 sctx->is_dev_replace = is_dev_replace;
Stefan Behrensff023aa2012-11-06 11:43:11 +0100407 sctx->pages_per_rd_bio = pages_per_rd_bio;
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100408 sctx->curr = -1;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100409 sctx->dev_root = dev->dev_root;
Stefan Behrensff023aa2012-11-06 11:43:11 +0100410 for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) {
Arne Jansena2de7332011-03-08 14:14:00 +0100411 struct scrub_bio *sbio;
412
413 sbio = kzalloc(sizeof(*sbio), GFP_NOFS);
414 if (!sbio)
415 goto nomem;
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100416 sctx->bios[i] = sbio;
Arne Jansena2de7332011-03-08 14:14:00 +0100417
Arne Jansena2de7332011-03-08 14:14:00 +0100418 sbio->index = i;
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100419 sbio->sctx = sctx;
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400420 sbio->page_count = 0;
421 sbio->work.func = scrub_bio_end_io_worker;
Arne Jansena2de7332011-03-08 14:14:00 +0100422
Stefan Behrensff023aa2012-11-06 11:43:11 +0100423 if (i != SCRUB_BIOS_PER_SCTX - 1)
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100424 sctx->bios[i]->next_free = i + 1;
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200425 else
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100426 sctx->bios[i]->next_free = -1;
Arne Jansena2de7332011-03-08 14:14:00 +0100427 }
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100428 sctx->first_free = 0;
429 sctx->nodesize = dev->dev_root->nodesize;
430 sctx->leafsize = dev->dev_root->leafsize;
431 sctx->sectorsize = dev->dev_root->sectorsize;
Stefan Behrensb6bfebc2012-11-02 16:44:58 +0100432 atomic_set(&sctx->bios_in_flight, 0);
433 atomic_set(&sctx->workers_pending, 0);
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100434 atomic_set(&sctx->cancel_req, 0);
435 sctx->csum_size = btrfs_super_csum_size(fs_info->super_copy);
436 INIT_LIST_HEAD(&sctx->csum_list);
Arne Jansena2de7332011-03-08 14:14:00 +0100437
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100438 spin_lock_init(&sctx->list_lock);
439 spin_lock_init(&sctx->stat_lock);
440 init_waitqueue_head(&sctx->list_wait);
Stefan Behrensff023aa2012-11-06 11:43:11 +0100441
442 ret = scrub_setup_wr_ctx(sctx, &sctx->wr_ctx, fs_info,
443 fs_info->dev_replace.tgtdev, is_dev_replace);
444 if (ret) {
445 scrub_free_ctx(sctx);
446 return ERR_PTR(ret);
447 }
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100448 return sctx;
Arne Jansena2de7332011-03-08 14:14:00 +0100449
450nomem:
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100451 scrub_free_ctx(sctx);
Arne Jansena2de7332011-03-08 14:14:00 +0100452 return ERR_PTR(-ENOMEM);
453}
454
Stefan Behrensff023aa2012-11-06 11:43:11 +0100455static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root,
456 void *warn_ctx)
Jan Schmidt558540c2011-06-13 19:59:12 +0200457{
458 u64 isize;
459 u32 nlink;
460 int ret;
461 int i;
462 struct extent_buffer *eb;
463 struct btrfs_inode_item *inode_item;
Stefan Behrensff023aa2012-11-06 11:43:11 +0100464 struct scrub_warning *swarn = warn_ctx;
Jan Schmidt558540c2011-06-13 19:59:12 +0200465 struct btrfs_fs_info *fs_info = swarn->dev->dev_root->fs_info;
466 struct inode_fs_paths *ipath = NULL;
467 struct btrfs_root *local_root;
468 struct btrfs_key root_key;
469
470 root_key.objectid = root;
471 root_key.type = BTRFS_ROOT_ITEM_KEY;
472 root_key.offset = (u64)-1;
473 local_root = btrfs_read_fs_root_no_name(fs_info, &root_key);
474 if (IS_ERR(local_root)) {
475 ret = PTR_ERR(local_root);
476 goto err;
477 }
478
479 ret = inode_item_info(inum, 0, local_root, swarn->path);
480 if (ret) {
481 btrfs_release_path(swarn->path);
482 goto err;
483 }
484
485 eb = swarn->path->nodes[0];
486 inode_item = btrfs_item_ptr(eb, swarn->path->slots[0],
487 struct btrfs_inode_item);
488 isize = btrfs_inode_size(eb, inode_item);
489 nlink = btrfs_inode_nlink(eb, inode_item);
490 btrfs_release_path(swarn->path);
491
492 ipath = init_ipath(4096, local_root, swarn->path);
Dan Carpenter26bdef52011-11-16 11:28:01 +0300493 if (IS_ERR(ipath)) {
494 ret = PTR_ERR(ipath);
495 ipath = NULL;
496 goto err;
497 }
Jan Schmidt558540c2011-06-13 19:59:12 +0200498 ret = paths_from_inode(inum, ipath);
499
500 if (ret < 0)
501 goto err;
502
503 /*
504 * we deliberately ignore the bit ipath might have been too small to
505 * hold all of the paths here
506 */
507 for (i = 0; i < ipath->fspath->elem_cnt; ++i)
Frank Holtonefe120a2013-12-20 11:37:06 -0500508 printk_in_rcu(KERN_WARNING "BTRFS: %s at logical %llu on dev "
Jan Schmidt558540c2011-06-13 19:59:12 +0200509 "%s, sector %llu, root %llu, inode %llu, offset %llu, "
510 "length %llu, links %u (path: %s)\n", swarn->errstr,
Josef Bacik606686e2012-06-04 14:03:51 -0400511 swarn->logical, rcu_str_deref(swarn->dev->name),
Jan Schmidt558540c2011-06-13 19:59:12 +0200512 (unsigned long long)swarn->sector, root, inum, offset,
513 min(isize - offset, (u64)PAGE_SIZE), nlink,
Jeff Mahoney745c4d82011-11-20 07:31:57 -0500514 (char *)(unsigned long)ipath->fspath->val[i]);
Jan Schmidt558540c2011-06-13 19:59:12 +0200515
516 free_ipath(ipath);
517 return 0;
518
519err:
Frank Holtonefe120a2013-12-20 11:37:06 -0500520 printk_in_rcu(KERN_WARNING "BTRFS: %s at logical %llu on dev "
Jan Schmidt558540c2011-06-13 19:59:12 +0200521 "%s, sector %llu, root %llu, inode %llu, offset %llu: path "
522 "resolving failed with ret=%d\n", swarn->errstr,
Josef Bacik606686e2012-06-04 14:03:51 -0400523 swarn->logical, rcu_str_deref(swarn->dev->name),
Jan Schmidt558540c2011-06-13 19:59:12 +0200524 (unsigned long long)swarn->sector, root, inum, offset, ret);
525
526 free_ipath(ipath);
527 return 0;
528}
529
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400530static void scrub_print_warning(const char *errstr, struct scrub_block *sblock)
Jan Schmidt558540c2011-06-13 19:59:12 +0200531{
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100532 struct btrfs_device *dev;
533 struct btrfs_fs_info *fs_info;
Jan Schmidt558540c2011-06-13 19:59:12 +0200534 struct btrfs_path *path;
535 struct btrfs_key found_key;
536 struct extent_buffer *eb;
537 struct btrfs_extent_item *ei;
538 struct scrub_warning swarn;
Jan Schmidt558540c2011-06-13 19:59:12 +0200539 unsigned long ptr = 0;
Jan Schmidt4692cf52011-12-02 14:56:41 +0100540 u64 extent_item_pos;
Liu Bo69917e42012-09-07 20:01:28 -0600541 u64 flags = 0;
542 u64 ref_root;
543 u32 item_size;
544 u8 ref_level;
545 const int bufsize = 4096;
546 int ret;
Jan Schmidt558540c2011-06-13 19:59:12 +0200547
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100548 WARN_ON(sblock->page_count < 1);
Stefan Behrens7a9e9982012-11-02 14:58:04 +0100549 dev = sblock->pagev[0]->dev;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100550 fs_info = sblock->sctx->dev_root->fs_info;
551
Jan Schmidt558540c2011-06-13 19:59:12 +0200552 path = btrfs_alloc_path();
553
554 swarn.scratch_buf = kmalloc(bufsize, GFP_NOFS);
555 swarn.msg_buf = kmalloc(bufsize, GFP_NOFS);
Stefan Behrens7a9e9982012-11-02 14:58:04 +0100556 swarn.sector = (sblock->pagev[0]->physical) >> 9;
557 swarn.logical = sblock->pagev[0]->logical;
Jan Schmidt558540c2011-06-13 19:59:12 +0200558 swarn.errstr = errstr;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100559 swarn.dev = NULL;
Jan Schmidt558540c2011-06-13 19:59:12 +0200560 swarn.msg_bufsize = bufsize;
561 swarn.scratch_bufsize = bufsize;
562
563 if (!path || !swarn.scratch_buf || !swarn.msg_buf)
564 goto out;
565
Liu Bo69917e42012-09-07 20:01:28 -0600566 ret = extent_from_logical(fs_info, swarn.logical, path, &found_key,
567 &flags);
Jan Schmidt558540c2011-06-13 19:59:12 +0200568 if (ret < 0)
569 goto out;
570
Jan Schmidt4692cf52011-12-02 14:56:41 +0100571 extent_item_pos = swarn.logical - found_key.objectid;
Jan Schmidt558540c2011-06-13 19:59:12 +0200572 swarn.extent_item_size = found_key.offset;
573
574 eb = path->nodes[0];
575 ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item);
576 item_size = btrfs_item_size_nr(eb, path->slots[0]);
577
Liu Bo69917e42012-09-07 20:01:28 -0600578 if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
Jan Schmidt558540c2011-06-13 19:59:12 +0200579 do {
580 ret = tree_backref_for_extent(&ptr, eb, ei, item_size,
581 &ref_root, &ref_level);
Josef Bacik606686e2012-06-04 14:03:51 -0400582 printk_in_rcu(KERN_WARNING
Frank Holtonefe120a2013-12-20 11:37:06 -0500583 "BTRFS: %s at logical %llu on dev %s, "
Jan Schmidt558540c2011-06-13 19:59:12 +0200584 "sector %llu: metadata %s (level %d) in tree "
Josef Bacik606686e2012-06-04 14:03:51 -0400585 "%llu\n", errstr, swarn.logical,
586 rcu_str_deref(dev->name),
Jan Schmidt558540c2011-06-13 19:59:12 +0200587 (unsigned long long)swarn.sector,
588 ref_level ? "node" : "leaf",
589 ret < 0 ? -1 : ref_level,
590 ret < 0 ? -1 : ref_root);
591 } while (ret != 1);
Josef Bacikd8fe29e2013-03-29 08:09:34 -0600592 btrfs_release_path(path);
Jan Schmidt558540c2011-06-13 19:59:12 +0200593 } else {
Josef Bacikd8fe29e2013-03-29 08:09:34 -0600594 btrfs_release_path(path);
Jan Schmidt558540c2011-06-13 19:59:12 +0200595 swarn.path = path;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100596 swarn.dev = dev;
Jan Schmidt7a3ae2f2012-03-23 17:32:28 +0100597 iterate_extent_inodes(fs_info, found_key.objectid,
598 extent_item_pos, 1,
Jan Schmidt558540c2011-06-13 19:59:12 +0200599 scrub_print_warning_inode, &swarn);
600 }
601
602out:
603 btrfs_free_path(path);
604 kfree(swarn.scratch_buf);
605 kfree(swarn.msg_buf);
606}
607
Stefan Behrensff023aa2012-11-06 11:43:11 +0100608static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *fixup_ctx)
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200609{
Jan Schmidt5da6fcb2011-08-04 18:11:04 +0200610 struct page *page = NULL;
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200611 unsigned long index;
Stefan Behrensff023aa2012-11-06 11:43:11 +0100612 struct scrub_fixup_nodatasum *fixup = fixup_ctx;
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200613 int ret;
Jan Schmidt5da6fcb2011-08-04 18:11:04 +0200614 int corrected = 0;
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200615 struct btrfs_key key;
Jan Schmidt5da6fcb2011-08-04 18:11:04 +0200616 struct inode *inode = NULL;
Liu Bo6f1c3602013-01-29 03:22:10 +0000617 struct btrfs_fs_info *fs_info;
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200618 u64 end = offset + PAGE_SIZE - 1;
619 struct btrfs_root *local_root;
Liu Bo6f1c3602013-01-29 03:22:10 +0000620 int srcu_index;
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200621
622 key.objectid = root;
623 key.type = BTRFS_ROOT_ITEM_KEY;
624 key.offset = (u64)-1;
Liu Bo6f1c3602013-01-29 03:22:10 +0000625
626 fs_info = fixup->root->fs_info;
627 srcu_index = srcu_read_lock(&fs_info->subvol_srcu);
628
629 local_root = btrfs_read_fs_root_no_name(fs_info, &key);
630 if (IS_ERR(local_root)) {
631 srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200632 return PTR_ERR(local_root);
Liu Bo6f1c3602013-01-29 03:22:10 +0000633 }
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200634
635 key.type = BTRFS_INODE_ITEM_KEY;
636 key.objectid = inum;
637 key.offset = 0;
Liu Bo6f1c3602013-01-29 03:22:10 +0000638 inode = btrfs_iget(fs_info->sb, &key, local_root, NULL);
639 srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200640 if (IS_ERR(inode))
641 return PTR_ERR(inode);
642
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200643 index = offset >> PAGE_CACHE_SHIFT;
644
645 page = find_or_create_page(inode->i_mapping, index, GFP_NOFS);
Jan Schmidt5da6fcb2011-08-04 18:11:04 +0200646 if (!page) {
647 ret = -ENOMEM;
648 goto out;
649 }
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200650
Jan Schmidt5da6fcb2011-08-04 18:11:04 +0200651 if (PageUptodate(page)) {
Jan Schmidt5da6fcb2011-08-04 18:11:04 +0200652 if (PageDirty(page)) {
653 /*
654 * we need to write the data to the defect sector. the
655 * data that was in that sector is not in memory,
656 * because the page was modified. we must not write the
657 * modified page to that sector.
658 *
659 * TODO: what could be done here: wait for the delalloc
660 * runner to write out that page (might involve
661 * COW) and see whether the sector is still
662 * referenced afterwards.
663 *
664 * For the meantime, we'll treat this error
665 * incorrectable, although there is a chance that a
666 * later scrub will find the bad sector again and that
667 * there's no dirty page in memory, then.
668 */
669 ret = -EIO;
670 goto out;
671 }
Stefan Behrens3ec706c2012-11-05 15:46:42 +0100672 fs_info = BTRFS_I(inode)->root->fs_info;
673 ret = repair_io_failure(fs_info, offset, PAGE_SIZE,
Jan Schmidt5da6fcb2011-08-04 18:11:04 +0200674 fixup->logical, page,
675 fixup->mirror_num);
676 unlock_page(page);
677 corrected = !ret;
678 } else {
679 /*
680 * we need to get good data first. the general readpage path
681 * will call repair_io_failure for us, we just have to make
682 * sure we read the bad mirror.
683 */
684 ret = set_extent_bits(&BTRFS_I(inode)->io_tree, offset, end,
685 EXTENT_DAMAGED, GFP_NOFS);
686 if (ret) {
687 /* set_extent_bits should give proper error */
688 WARN_ON(ret > 0);
689 if (ret > 0)
690 ret = -EFAULT;
691 goto out;
692 }
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200693
Jan Schmidt5da6fcb2011-08-04 18:11:04 +0200694 ret = extent_read_full_page(&BTRFS_I(inode)->io_tree, page,
695 btrfs_get_extent,
696 fixup->mirror_num);
697 wait_on_page_locked(page);
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200698
Jan Schmidt5da6fcb2011-08-04 18:11:04 +0200699 corrected = !test_range_bit(&BTRFS_I(inode)->io_tree, offset,
700 end, EXTENT_DAMAGED, 0, NULL);
701 if (!corrected)
702 clear_extent_bits(&BTRFS_I(inode)->io_tree, offset, end,
703 EXTENT_DAMAGED, GFP_NOFS);
704 }
705
706out:
707 if (page)
708 put_page(page);
709 if (inode)
710 iput(inode);
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200711
712 if (ret < 0)
713 return ret;
714
715 if (ret == 0 && corrected) {
716 /*
717 * we only need to call readpage for one of the inodes belonging
718 * to this extent. so make iterate_extent_inodes stop
719 */
720 return 1;
721 }
722
723 return -EIO;
724}
725
726static void scrub_fixup_nodatasum(struct btrfs_work *work)
727{
728 int ret;
729 struct scrub_fixup_nodatasum *fixup;
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100730 struct scrub_ctx *sctx;
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200731 struct btrfs_trans_handle *trans = NULL;
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200732 struct btrfs_path *path;
733 int uncorrectable = 0;
734
735 fixup = container_of(work, struct scrub_fixup_nodatasum, work);
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100736 sctx = fixup->sctx;
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200737
738 path = btrfs_alloc_path();
739 if (!path) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100740 spin_lock(&sctx->stat_lock);
741 ++sctx->stat.malloc_errors;
742 spin_unlock(&sctx->stat_lock);
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200743 uncorrectable = 1;
744 goto out;
745 }
746
747 trans = btrfs_join_transaction(fixup->root);
748 if (IS_ERR(trans)) {
749 uncorrectable = 1;
750 goto out;
751 }
752
753 /*
754 * the idea is to trigger a regular read through the standard path. we
755 * read a page from the (failed) logical address by specifying the
756 * corresponding copynum of the failed sector. thus, that readpage is
757 * expected to fail.
758 * that is the point where on-the-fly error correction will kick in
759 * (once it's finished) and rewrite the failed sector if a good copy
760 * can be found.
761 */
762 ret = iterate_inodes_from_logical(fixup->logical, fixup->root->fs_info,
763 path, scrub_fixup_readpage,
764 fixup);
765 if (ret < 0) {
766 uncorrectable = 1;
767 goto out;
768 }
769 WARN_ON(ret != 1);
770
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100771 spin_lock(&sctx->stat_lock);
772 ++sctx->stat.corrected_errors;
773 spin_unlock(&sctx->stat_lock);
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200774
775out:
776 if (trans && !IS_ERR(trans))
777 btrfs_end_transaction(trans, fixup->root);
778 if (uncorrectable) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100779 spin_lock(&sctx->stat_lock);
780 ++sctx->stat.uncorrectable_errors;
781 spin_unlock(&sctx->stat_lock);
Stefan Behrensff023aa2012-11-06 11:43:11 +0100782 btrfs_dev_replace_stats_inc(
783 &sctx->dev_root->fs_info->dev_replace.
784 num_uncorrectable_read_errors);
Frank Holtonefe120a2013-12-20 11:37:06 -0500785 printk_ratelimited_in_rcu(KERN_ERR "BTRFS: "
786 "unable to fixup (nodatasum) error at logical %llu on dev %s\n",
Geert Uytterhoevenc1c9ff72013-08-20 13:20:07 +0200787 fixup->logical, rcu_str_deref(fixup->dev->name));
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200788 }
789
790 btrfs_free_path(path);
791 kfree(fixup);
792
Stefan Behrensb6bfebc2012-11-02 16:44:58 +0100793 scrub_pending_trans_workers_dec(sctx);
Jan Schmidt0ef8e452011-06-13 20:04:15 +0200794}
795
Arne Jansena2de7332011-03-08 14:14:00 +0100796/*
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400797 * scrub_handle_errored_block gets called when either verification of the
798 * pages failed or the bio failed to read, e.g. with EIO. In the latter
799 * case, this function handles all pages in the bio, even though only one
800 * may be bad.
801 * The goal of this function is to repair the errored block by using the
802 * contents of one of the mirrors.
Arne Jansena2de7332011-03-08 14:14:00 +0100803 */
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400804static int scrub_handle_errored_block(struct scrub_block *sblock_to_check)
Arne Jansena2de7332011-03-08 14:14:00 +0100805{
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100806 struct scrub_ctx *sctx = sblock_to_check->sctx;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100807 struct btrfs_device *dev;
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400808 struct btrfs_fs_info *fs_info;
Arne Jansena2de7332011-03-08 14:14:00 +0100809 u64 length;
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400810 u64 logical;
811 u64 generation;
812 unsigned int failed_mirror_index;
813 unsigned int is_metadata;
814 unsigned int have_csum;
815 u8 *csum;
816 struct scrub_block *sblocks_for_recheck; /* holds one for each mirror */
817 struct scrub_block *sblock_bad;
Arne Jansena2de7332011-03-08 14:14:00 +0100818 int ret;
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400819 int mirror_index;
820 int page_num;
821 int success;
822 static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL,
823 DEFAULT_RATELIMIT_BURST);
Arne Jansena2de7332011-03-08 14:14:00 +0100824
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400825 BUG_ON(sblock_to_check->page_count < 1);
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100826 fs_info = sctx->dev_root->fs_info;
Stefan Behrens4ded4f62012-11-14 18:57:29 +0000827 if (sblock_to_check->pagev[0]->flags & BTRFS_EXTENT_FLAG_SUPER) {
828 /*
829 * if we find an error in a super block, we just report it.
830 * They will get written with the next transaction commit
831 * anyway
832 */
833 spin_lock(&sctx->stat_lock);
834 ++sctx->stat.super_errors;
835 spin_unlock(&sctx->stat_lock);
836 return 0;
837 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400838 length = sblock_to_check->page_count * PAGE_SIZE;
Stefan Behrens7a9e9982012-11-02 14:58:04 +0100839 logical = sblock_to_check->pagev[0]->logical;
840 generation = sblock_to_check->pagev[0]->generation;
841 BUG_ON(sblock_to_check->pagev[0]->mirror_num < 1);
842 failed_mirror_index = sblock_to_check->pagev[0]->mirror_num - 1;
843 is_metadata = !(sblock_to_check->pagev[0]->flags &
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400844 BTRFS_EXTENT_FLAG_DATA);
Stefan Behrens7a9e9982012-11-02 14:58:04 +0100845 have_csum = sblock_to_check->pagev[0]->have_csum;
846 csum = sblock_to_check->pagev[0]->csum;
847 dev = sblock_to_check->pagev[0]->dev;
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400848
Stefan Behrensff023aa2012-11-06 11:43:11 +0100849 if (sctx->is_dev_replace && !is_metadata && !have_csum) {
850 sblocks_for_recheck = NULL;
851 goto nodatasum_case;
852 }
853
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400854 /*
855 * read all mirrors one after the other. This includes to
856 * re-read the extent or metadata block that failed (that was
857 * the cause that this fixup code is called) another time,
858 * page by page this time in order to know which pages
859 * caused I/O errors and which ones are good (for all mirrors).
860 * It is the goal to handle the situation when more than one
861 * mirror contains I/O errors, but the errors do not
862 * overlap, i.e. the data can be repaired by selecting the
863 * pages from those mirrors without I/O error on the
864 * particular pages. One example (with blocks >= 2 * PAGE_SIZE)
865 * would be that mirror #1 has an I/O error on the first page,
866 * the second page is good, and mirror #2 has an I/O error on
867 * the second page, but the first page is good.
868 * Then the first page of the first mirror can be repaired by
869 * taking the first page of the second mirror, and the
870 * second page of the second mirror can be repaired by
871 * copying the contents of the 2nd page of the 1st mirror.
872 * One more note: if the pages of one mirror contain I/O
873 * errors, the checksum cannot be verified. In order to get
874 * the best data for repairing, the first attempt is to find
875 * a mirror without I/O errors and with a validated checksum.
876 * Only if this is not possible, the pages are picked from
877 * mirrors with I/O errors without considering the checksum.
878 * If the latter is the case, at the end, the checksum of the
879 * repaired area is verified in order to correctly maintain
880 * the statistics.
881 */
882
883 sblocks_for_recheck = kzalloc(BTRFS_MAX_MIRRORS *
884 sizeof(*sblocks_for_recheck),
885 GFP_NOFS);
886 if (!sblocks_for_recheck) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100887 spin_lock(&sctx->stat_lock);
888 sctx->stat.malloc_errors++;
889 sctx->stat.read_errors++;
890 sctx->stat.uncorrectable_errors++;
891 spin_unlock(&sctx->stat_lock);
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100892 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400893 goto out;
894 }
895
896 /* setup the context, map the logical blocks and alloc the pages */
Stefan Behrensff023aa2012-11-06 11:43:11 +0100897 ret = scrub_setup_recheck_block(sctx, fs_info, sblock_to_check, length,
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400898 logical, sblocks_for_recheck);
899 if (ret) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100900 spin_lock(&sctx->stat_lock);
901 sctx->stat.read_errors++;
902 sctx->stat.uncorrectable_errors++;
903 spin_unlock(&sctx->stat_lock);
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100904 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400905 goto out;
906 }
907 BUG_ON(failed_mirror_index >= BTRFS_MAX_MIRRORS);
908 sblock_bad = sblocks_for_recheck + failed_mirror_index;
909
910 /* build and submit the bios for the failed mirror, check checksums */
Stefan Behrens34f5c8e2012-11-02 16:16:26 +0100911 scrub_recheck_block(fs_info, sblock_bad, is_metadata, have_csum,
912 csum, generation, sctx->csum_size);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400913
914 if (!sblock_bad->header_error && !sblock_bad->checksum_error &&
915 sblock_bad->no_io_error_seen) {
916 /*
917 * the error disappeared after reading page by page, or
918 * the area was part of a huge bio and other parts of the
919 * bio caused I/O errors, or the block layer merged several
920 * read requests into one and the error is caused by a
921 * different bio (usually one of the two latter cases is
922 * the cause)
923 */
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100924 spin_lock(&sctx->stat_lock);
925 sctx->stat.unverified_errors++;
926 spin_unlock(&sctx->stat_lock);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400927
Stefan Behrensff023aa2012-11-06 11:43:11 +0100928 if (sctx->is_dev_replace)
929 scrub_write_block_to_dev_replace(sblock_bad);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400930 goto out;
931 }
932
933 if (!sblock_bad->no_io_error_seen) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100934 spin_lock(&sctx->stat_lock);
935 sctx->stat.read_errors++;
936 spin_unlock(&sctx->stat_lock);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400937 if (__ratelimit(&_rs))
938 scrub_print_warning("i/o error", sblock_to_check);
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100939 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400940 } else if (sblock_bad->checksum_error) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100941 spin_lock(&sctx->stat_lock);
942 sctx->stat.csum_errors++;
943 spin_unlock(&sctx->stat_lock);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400944 if (__ratelimit(&_rs))
945 scrub_print_warning("checksum error", sblock_to_check);
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100946 btrfs_dev_stat_inc_and_print(dev,
Stefan Behrens442a4f62012-05-25 16:06:08 +0200947 BTRFS_DEV_STAT_CORRUPTION_ERRS);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400948 } else if (sblock_bad->header_error) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100949 spin_lock(&sctx->stat_lock);
950 sctx->stat.verify_errors++;
951 spin_unlock(&sctx->stat_lock);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400952 if (__ratelimit(&_rs))
953 scrub_print_warning("checksum/header error",
954 sblock_to_check);
Stefan Behrens442a4f62012-05-25 16:06:08 +0200955 if (sblock_bad->generation_error)
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100956 btrfs_dev_stat_inc_and_print(dev,
Stefan Behrens442a4f62012-05-25 16:06:08 +0200957 BTRFS_DEV_STAT_GENERATION_ERRS);
958 else
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100959 btrfs_dev_stat_inc_and_print(dev,
Stefan Behrens442a4f62012-05-25 16:06:08 +0200960 BTRFS_DEV_STAT_CORRUPTION_ERRS);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400961 }
962
Ilya Dryomov33ef30a2013-11-03 19:06:38 +0200963 if (sctx->readonly) {
964 ASSERT(!sctx->is_dev_replace);
965 goto out;
966 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400967
968 if (!is_metadata && !have_csum) {
969 struct scrub_fixup_nodatasum *fixup_nodatasum;
970
Stefan Behrensff023aa2012-11-06 11:43:11 +0100971nodatasum_case:
972 WARN_ON(sctx->is_dev_replace);
973
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400974 /*
975 * !is_metadata and !have_csum, this means that the data
976 * might not be COW'ed, that it might be modified
977 * concurrently. The general strategy to work on the
978 * commit root does not help in the case when COW is not
979 * used.
980 */
981 fixup_nodatasum = kzalloc(sizeof(*fixup_nodatasum), GFP_NOFS);
982 if (!fixup_nodatasum)
983 goto did_not_correct_error;
Stefan Behrensd9d181c2012-11-02 09:58:09 +0100984 fixup_nodatasum->sctx = sctx;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +0100985 fixup_nodatasum->dev = dev;
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400986 fixup_nodatasum->logical = logical;
987 fixup_nodatasum->root = fs_info->extent_root;
988 fixup_nodatasum->mirror_num = failed_mirror_index + 1;
Stefan Behrensb6bfebc2012-11-02 16:44:58 +0100989 scrub_pending_trans_workers_inc(sctx);
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400990 fixup_nodatasum->work.func = scrub_fixup_nodatasum;
991 btrfs_queue_worker(&fs_info->scrub_workers,
992 &fixup_nodatasum->work);
Arne Jansena2de7332011-03-08 14:14:00 +0100993 goto out;
994 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -0400995
996 /*
997 * now build and submit the bios for the other mirrors, check
Stefan Behrenscb2ced72012-11-02 16:14:21 +0100998 * checksums.
999 * First try to pick the mirror which is completely without I/O
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001000 * errors and also does not have a checksum error.
1001 * If one is found, and if a checksum is present, the full block
1002 * that is known to contain an error is rewritten. Afterwards
1003 * the block is known to be corrected.
1004 * If a mirror is found which is completely correct, and no
1005 * checksum is present, only those pages are rewritten that had
1006 * an I/O error in the block to be repaired, since it cannot be
1007 * determined, which copy of the other pages is better (and it
1008 * could happen otherwise that a correct page would be
1009 * overwritten by a bad one).
1010 */
1011 for (mirror_index = 0;
1012 mirror_index < BTRFS_MAX_MIRRORS &&
1013 sblocks_for_recheck[mirror_index].page_count > 0;
1014 mirror_index++) {
Stefan Behrenscb2ced72012-11-02 16:14:21 +01001015 struct scrub_block *sblock_other;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001016
Stefan Behrenscb2ced72012-11-02 16:14:21 +01001017 if (mirror_index == failed_mirror_index)
1018 continue;
1019 sblock_other = sblocks_for_recheck + mirror_index;
1020
1021 /* build and submit the bios, check checksums */
Stefan Behrens34f5c8e2012-11-02 16:16:26 +01001022 scrub_recheck_block(fs_info, sblock_other, is_metadata,
1023 have_csum, csum, generation,
1024 sctx->csum_size);
1025
1026 if (!sblock_other->header_error &&
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001027 !sblock_other->checksum_error &&
1028 sblock_other->no_io_error_seen) {
Stefan Behrensff023aa2012-11-06 11:43:11 +01001029 if (sctx->is_dev_replace) {
1030 scrub_write_block_to_dev_replace(sblock_other);
1031 } else {
1032 int force_write = is_metadata || have_csum;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001033
Stefan Behrensff023aa2012-11-06 11:43:11 +01001034 ret = scrub_repair_block_from_good_copy(
1035 sblock_bad, sblock_other,
1036 force_write);
1037 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001038 if (0 == ret)
1039 goto corrected_error;
Arne Jansena2de7332011-03-08 14:14:00 +01001040 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001041 }
1042
1043 /*
Stefan Behrensff023aa2012-11-06 11:43:11 +01001044 * for dev_replace, pick good pages and write to the target device.
1045 */
1046 if (sctx->is_dev_replace) {
1047 success = 1;
1048 for (page_num = 0; page_num < sblock_bad->page_count;
1049 page_num++) {
1050 int sub_success;
1051
1052 sub_success = 0;
1053 for (mirror_index = 0;
1054 mirror_index < BTRFS_MAX_MIRRORS &&
1055 sblocks_for_recheck[mirror_index].page_count > 0;
1056 mirror_index++) {
1057 struct scrub_block *sblock_other =
1058 sblocks_for_recheck + mirror_index;
1059 struct scrub_page *page_other =
1060 sblock_other->pagev[page_num];
1061
1062 if (!page_other->io_error) {
1063 ret = scrub_write_page_to_dev_replace(
1064 sblock_other, page_num);
1065 if (ret == 0) {
1066 /* succeeded for this page */
1067 sub_success = 1;
1068 break;
1069 } else {
1070 btrfs_dev_replace_stats_inc(
1071 &sctx->dev_root->
1072 fs_info->dev_replace.
1073 num_write_errors);
1074 }
1075 }
1076 }
1077
1078 if (!sub_success) {
1079 /*
1080 * did not find a mirror to fetch the page
1081 * from. scrub_write_page_to_dev_replace()
1082 * handles this case (page->io_error), by
1083 * filling the block with zeros before
1084 * submitting the write request
1085 */
1086 success = 0;
1087 ret = scrub_write_page_to_dev_replace(
1088 sblock_bad, page_num);
1089 if (ret)
1090 btrfs_dev_replace_stats_inc(
1091 &sctx->dev_root->fs_info->
1092 dev_replace.num_write_errors);
1093 }
1094 }
1095
1096 goto out;
1097 }
1098
1099 /*
1100 * for regular scrub, repair those pages that are errored.
1101 * In case of I/O errors in the area that is supposed to be
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001102 * repaired, continue by picking good copies of those pages.
1103 * Select the good pages from mirrors to rewrite bad pages from
1104 * the area to fix. Afterwards verify the checksum of the block
1105 * that is supposed to be repaired. This verification step is
1106 * only done for the purpose of statistic counting and for the
1107 * final scrub report, whether errors remain.
1108 * A perfect algorithm could make use of the checksum and try
1109 * all possible combinations of pages from the different mirrors
1110 * until the checksum verification succeeds. For example, when
1111 * the 2nd page of mirror #1 faces I/O errors, and the 2nd page
1112 * of mirror #2 is readable but the final checksum test fails,
1113 * then the 2nd page of mirror #3 could be tried, whether now
1114 * the final checksum succeedes. But this would be a rare
1115 * exception and is therefore not implemented. At least it is
1116 * avoided that the good copy is overwritten.
1117 * A more useful improvement would be to pick the sectors
1118 * without I/O error based on sector sizes (512 bytes on legacy
1119 * disks) instead of on PAGE_SIZE. Then maybe 512 byte of one
1120 * mirror could be repaired by taking 512 byte of a different
1121 * mirror, even if other 512 byte sectors in the same PAGE_SIZE
1122 * area are unreadable.
1123 */
1124
1125 /* can only fix I/O errors from here on */
1126 if (sblock_bad->no_io_error_seen)
1127 goto did_not_correct_error;
1128
1129 success = 1;
1130 for (page_num = 0; page_num < sblock_bad->page_count; page_num++) {
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001131 struct scrub_page *page_bad = sblock_bad->pagev[page_num];
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001132
1133 if (!page_bad->io_error)
1134 continue;
1135
1136 for (mirror_index = 0;
1137 mirror_index < BTRFS_MAX_MIRRORS &&
1138 sblocks_for_recheck[mirror_index].page_count > 0;
1139 mirror_index++) {
1140 struct scrub_block *sblock_other = sblocks_for_recheck +
1141 mirror_index;
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001142 struct scrub_page *page_other = sblock_other->pagev[
1143 page_num];
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001144
1145 if (!page_other->io_error) {
1146 ret = scrub_repair_page_from_good_copy(
1147 sblock_bad, sblock_other, page_num, 0);
1148 if (0 == ret) {
1149 page_bad->io_error = 0;
1150 break; /* succeeded for this page */
1151 }
Jan Schmidt13db62b2011-06-13 19:56:13 +02001152 }
1153 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001154
1155 if (page_bad->io_error) {
1156 /* did not find a mirror to copy the page from */
1157 success = 0;
1158 }
1159 }
1160
1161 if (success) {
1162 if (is_metadata || have_csum) {
1163 /*
1164 * need to verify the checksum now that all
1165 * sectors on disk are repaired (the write
1166 * request for data to be repaired is on its way).
1167 * Just be lazy and use scrub_recheck_block()
1168 * which re-reads the data before the checksum
1169 * is verified, but most likely the data comes out
1170 * of the page cache.
1171 */
Stefan Behrens34f5c8e2012-11-02 16:16:26 +01001172 scrub_recheck_block(fs_info, sblock_bad,
1173 is_metadata, have_csum, csum,
1174 generation, sctx->csum_size);
1175 if (!sblock_bad->header_error &&
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001176 !sblock_bad->checksum_error &&
1177 sblock_bad->no_io_error_seen)
1178 goto corrected_error;
1179 else
1180 goto did_not_correct_error;
1181 } else {
1182corrected_error:
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001183 spin_lock(&sctx->stat_lock);
1184 sctx->stat.corrected_errors++;
1185 spin_unlock(&sctx->stat_lock);
Josef Bacik606686e2012-06-04 14:03:51 -04001186 printk_ratelimited_in_rcu(KERN_ERR
Frank Holtonefe120a2013-12-20 11:37:06 -05001187 "BTRFS: fixed up error at logical %llu on dev %s\n",
Geert Uytterhoevenc1c9ff72013-08-20 13:20:07 +02001188 logical, rcu_str_deref(dev->name));
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001189 }
1190 } else {
1191did_not_correct_error:
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001192 spin_lock(&sctx->stat_lock);
1193 sctx->stat.uncorrectable_errors++;
1194 spin_unlock(&sctx->stat_lock);
Josef Bacik606686e2012-06-04 14:03:51 -04001195 printk_ratelimited_in_rcu(KERN_ERR
Frank Holtonefe120a2013-12-20 11:37:06 -05001196 "BTRFS: unable to fixup (regular) error at logical %llu on dev %s\n",
Geert Uytterhoevenc1c9ff72013-08-20 13:20:07 +02001197 logical, rcu_str_deref(dev->name));
Arne Jansena2de7332011-03-08 14:14:00 +01001198 }
1199
1200out:
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001201 if (sblocks_for_recheck) {
1202 for (mirror_index = 0; mirror_index < BTRFS_MAX_MIRRORS;
1203 mirror_index++) {
1204 struct scrub_block *sblock = sblocks_for_recheck +
1205 mirror_index;
1206 int page_index;
1207
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001208 for (page_index = 0; page_index < sblock->page_count;
1209 page_index++) {
1210 sblock->pagev[page_index]->sblock = NULL;
1211 scrub_page_put(sblock->pagev[page_index]);
1212 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001213 }
1214 kfree(sblocks_for_recheck);
1215 }
1216
1217 return 0;
Arne Jansena2de7332011-03-08 14:14:00 +01001218}
1219
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001220static int scrub_setup_recheck_block(struct scrub_ctx *sctx,
Stefan Behrens3ec706c2012-11-05 15:46:42 +01001221 struct btrfs_fs_info *fs_info,
Stefan Behrensff023aa2012-11-06 11:43:11 +01001222 struct scrub_block *original_sblock,
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001223 u64 length, u64 logical,
1224 struct scrub_block *sblocks_for_recheck)
Arne Jansena2de7332011-03-08 14:14:00 +01001225{
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001226 int page_index;
1227 int mirror_index;
1228 int ret;
1229
1230 /*
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001231 * note: the two members ref_count and outstanding_pages
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001232 * are not used (and not set) in the blocks that are used for
1233 * the recheck procedure
1234 */
1235
1236 page_index = 0;
1237 while (length > 0) {
1238 u64 sublen = min_t(u64, length, PAGE_SIZE);
1239 u64 mapped_length = sublen;
1240 struct btrfs_bio *bbio = NULL;
1241
1242 /*
1243 * with a length of PAGE_SIZE, each returned stripe
1244 * represents one mirror
1245 */
Stefan Behrens29a8d9a2012-11-06 14:16:24 +01001246 ret = btrfs_map_block(fs_info, REQ_GET_READ_MIRRORS, logical,
1247 &mapped_length, &bbio, 0);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001248 if (ret || !bbio || mapped_length < sublen) {
1249 kfree(bbio);
1250 return -EIO;
1251 }
1252
Stefan Behrensff023aa2012-11-06 11:43:11 +01001253 BUG_ON(page_index >= SCRUB_PAGES_PER_RD_BIO);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001254 for (mirror_index = 0; mirror_index < (int)bbio->num_stripes;
1255 mirror_index++) {
1256 struct scrub_block *sblock;
1257 struct scrub_page *page;
1258
1259 if (mirror_index >= BTRFS_MAX_MIRRORS)
1260 continue;
1261
1262 sblock = sblocks_for_recheck + mirror_index;
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001263 sblock->sctx = sctx;
1264 page = kzalloc(sizeof(*page), GFP_NOFS);
1265 if (!page) {
1266leave_nomem:
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001267 spin_lock(&sctx->stat_lock);
1268 sctx->stat.malloc_errors++;
1269 spin_unlock(&sctx->stat_lock);
Wei Yongjuncf93dcc2012-09-02 07:44:51 -06001270 kfree(bbio);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001271 return -ENOMEM;
1272 }
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001273 scrub_page_get(page);
1274 sblock->pagev[page_index] = page;
1275 page->logical = logical;
1276 page->physical = bbio->stripes[mirror_index].physical;
Stefan Behrensff023aa2012-11-06 11:43:11 +01001277 BUG_ON(page_index >= original_sblock->page_count);
1278 page->physical_for_dev_replace =
1279 original_sblock->pagev[page_index]->
1280 physical_for_dev_replace;
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001281 /* for missing devices, dev->bdev is NULL */
1282 page->dev = bbio->stripes[mirror_index].dev;
1283 page->mirror_num = mirror_index + 1;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001284 sblock->page_count++;
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001285 page->page = alloc_page(GFP_NOFS);
1286 if (!page->page)
1287 goto leave_nomem;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001288 }
1289 kfree(bbio);
1290 length -= sublen;
1291 logical += sublen;
1292 page_index++;
1293 }
1294
1295 return 0;
1296}
1297
1298/*
1299 * this function will check the on disk data for checksum errors, header
1300 * errors and read I/O errors. If any I/O errors happen, the exact pages
1301 * which are errored are marked as being bad. The goal is to enable scrub
1302 * to take those pages that are not errored from all the mirrors so that
1303 * the pages that are errored in the just handled mirror can be repaired.
1304 */
Stefan Behrens34f5c8e2012-11-02 16:16:26 +01001305static void scrub_recheck_block(struct btrfs_fs_info *fs_info,
1306 struct scrub_block *sblock, int is_metadata,
1307 int have_csum, u8 *csum, u64 generation,
1308 u16 csum_size)
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001309{
1310 int page_num;
1311
1312 sblock->no_io_error_seen = 1;
1313 sblock->header_error = 0;
1314 sblock->checksum_error = 0;
1315
1316 for (page_num = 0; page_num < sblock->page_count; page_num++) {
1317 struct bio *bio;
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001318 struct scrub_page *page = sblock->pagev[page_num];
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001319
Stefan Behrens442a4f62012-05-25 16:06:08 +02001320 if (page->dev->bdev == NULL) {
Stefan Behrensea9947b2012-05-04 15:16:07 -04001321 page->io_error = 1;
1322 sblock->no_io_error_seen = 0;
1323 continue;
1324 }
1325
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001326 WARN_ON(!page->page);
Chris Mason9be33952013-05-17 18:30:14 -04001327 bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
Stefan Behrens34f5c8e2012-11-02 16:16:26 +01001328 if (!bio) {
1329 page->io_error = 1;
1330 sblock->no_io_error_seen = 0;
1331 continue;
1332 }
Stefan Behrens442a4f62012-05-25 16:06:08 +02001333 bio->bi_bdev = page->dev->bdev;
Kent Overstreet4f024f32013-10-11 15:44:27 -07001334 bio->bi_iter.bi_sector = page->physical >> 9;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001335
Stefan Behrens34f5c8e2012-11-02 16:16:26 +01001336 bio_add_page(bio, page->page, PAGE_SIZE, 0);
Kent Overstreet33879d42013-11-23 22:33:32 -08001337 if (btrfsic_submit_bio_wait(READ, bio))
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001338 sblock->no_io_error_seen = 0;
Kent Overstreet33879d42013-11-23 22:33:32 -08001339
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001340 bio_put(bio);
1341 }
1342
1343 if (sblock->no_io_error_seen)
1344 scrub_recheck_block_checksum(fs_info, sblock, is_metadata,
1345 have_csum, csum, generation,
1346 csum_size);
1347
Stefan Behrens34f5c8e2012-11-02 16:16:26 +01001348 return;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001349}
1350
1351static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info,
1352 struct scrub_block *sblock,
1353 int is_metadata, int have_csum,
1354 const u8 *csum, u64 generation,
1355 u16 csum_size)
1356{
1357 int page_num;
1358 u8 calculated_csum[BTRFS_CSUM_SIZE];
1359 u32 crc = ~(u32)0;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001360 void *mapped_buffer;
1361
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001362 WARN_ON(!sblock->pagev[0]->page);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001363 if (is_metadata) {
1364 struct btrfs_header *h;
1365
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001366 mapped_buffer = kmap_atomic(sblock->pagev[0]->page);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001367 h = (struct btrfs_header *)mapped_buffer;
1368
Qu Wenruo3cae2102013-07-16 11:19:18 +08001369 if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h) ||
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001370 memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE) ||
1371 memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid,
Stefan Behrens442a4f62012-05-25 16:06:08 +02001372 BTRFS_UUID_SIZE)) {
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001373 sblock->header_error = 1;
Qu Wenruo3cae2102013-07-16 11:19:18 +08001374 } else if (generation != btrfs_stack_header_generation(h)) {
Stefan Behrens442a4f62012-05-25 16:06:08 +02001375 sblock->header_error = 1;
1376 sblock->generation_error = 1;
1377 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001378 csum = h->csum;
1379 } else {
1380 if (!have_csum)
1381 return;
1382
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001383 mapped_buffer = kmap_atomic(sblock->pagev[0]->page);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001384 }
1385
1386 for (page_num = 0;;) {
1387 if (page_num == 0 && is_metadata)
Liu Bob0496682013-03-14 14:57:45 +00001388 crc = btrfs_csum_data(
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001389 ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE,
1390 crc, PAGE_SIZE - BTRFS_CSUM_SIZE);
1391 else
Liu Bob0496682013-03-14 14:57:45 +00001392 crc = btrfs_csum_data(mapped_buffer, crc, PAGE_SIZE);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001393
Linus Torvalds9613beb2012-03-30 12:44:29 -07001394 kunmap_atomic(mapped_buffer);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001395 page_num++;
1396 if (page_num >= sblock->page_count)
1397 break;
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001398 WARN_ON(!sblock->pagev[page_num]->page);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001399
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001400 mapped_buffer = kmap_atomic(sblock->pagev[page_num]->page);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001401 }
1402
1403 btrfs_csum_final(crc, calculated_csum);
1404 if (memcmp(calculated_csum, csum, csum_size))
1405 sblock->checksum_error = 1;
1406}
1407
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001408static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad,
1409 struct scrub_block *sblock_good,
1410 int force_write)
1411{
1412 int page_num;
1413 int ret = 0;
1414
1415 for (page_num = 0; page_num < sblock_bad->page_count; page_num++) {
1416 int ret_sub;
1417
1418 ret_sub = scrub_repair_page_from_good_copy(sblock_bad,
1419 sblock_good,
1420 page_num,
1421 force_write);
1422 if (ret_sub)
1423 ret = ret_sub;
1424 }
1425
1426 return ret;
1427}
1428
1429static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad,
1430 struct scrub_block *sblock_good,
1431 int page_num, int force_write)
1432{
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001433 struct scrub_page *page_bad = sblock_bad->pagev[page_num];
1434 struct scrub_page *page_good = sblock_good->pagev[page_num];
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001435
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001436 BUG_ON(page_bad->page == NULL);
1437 BUG_ON(page_good->page == NULL);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001438 if (force_write || sblock_bad->header_error ||
1439 sblock_bad->checksum_error || page_bad->io_error) {
1440 struct bio *bio;
1441 int ret;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001442
Stefan Behrensff023aa2012-11-06 11:43:11 +01001443 if (!page_bad->dev->bdev) {
Frank Holtonefe120a2013-12-20 11:37:06 -05001444 printk_ratelimited(KERN_WARNING "BTRFS: "
1445 "scrub_repair_page_from_good_copy(bdev == NULL) "
1446 "is unexpected!\n");
Stefan Behrensff023aa2012-11-06 11:43:11 +01001447 return -EIO;
1448 }
1449
Chris Mason9be33952013-05-17 18:30:14 -04001450 bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
Tsutomu Itohe627ee72012-04-12 16:03:56 -04001451 if (!bio)
1452 return -EIO;
Stefan Behrens442a4f62012-05-25 16:06:08 +02001453 bio->bi_bdev = page_bad->dev->bdev;
Kent Overstreet4f024f32013-10-11 15:44:27 -07001454 bio->bi_iter.bi_sector = page_bad->physical >> 9;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001455
1456 ret = bio_add_page(bio, page_good->page, PAGE_SIZE, 0);
1457 if (PAGE_SIZE != ret) {
1458 bio_put(bio);
1459 return -EIO;
1460 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001461
Kent Overstreet33879d42013-11-23 22:33:32 -08001462 if (btrfsic_submit_bio_wait(WRITE, bio)) {
Stefan Behrens442a4f62012-05-25 16:06:08 +02001463 btrfs_dev_stat_inc_and_print(page_bad->dev,
1464 BTRFS_DEV_STAT_WRITE_ERRS);
Stefan Behrensff023aa2012-11-06 11:43:11 +01001465 btrfs_dev_replace_stats_inc(
1466 &sblock_bad->sctx->dev_root->fs_info->
1467 dev_replace.num_write_errors);
Stefan Behrens442a4f62012-05-25 16:06:08 +02001468 bio_put(bio);
1469 return -EIO;
1470 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001471 bio_put(bio);
1472 }
1473
1474 return 0;
1475}
1476
Stefan Behrensff023aa2012-11-06 11:43:11 +01001477static void scrub_write_block_to_dev_replace(struct scrub_block *sblock)
1478{
1479 int page_num;
1480
1481 for (page_num = 0; page_num < sblock->page_count; page_num++) {
1482 int ret;
1483
1484 ret = scrub_write_page_to_dev_replace(sblock, page_num);
1485 if (ret)
1486 btrfs_dev_replace_stats_inc(
1487 &sblock->sctx->dev_root->fs_info->dev_replace.
1488 num_write_errors);
1489 }
1490}
1491
1492static int scrub_write_page_to_dev_replace(struct scrub_block *sblock,
1493 int page_num)
1494{
1495 struct scrub_page *spage = sblock->pagev[page_num];
1496
1497 BUG_ON(spage->page == NULL);
1498 if (spage->io_error) {
1499 void *mapped_buffer = kmap_atomic(spage->page);
1500
1501 memset(mapped_buffer, 0, PAGE_CACHE_SIZE);
1502 flush_dcache_page(spage->page);
1503 kunmap_atomic(mapped_buffer);
1504 }
1505 return scrub_add_page_to_wr_bio(sblock->sctx, spage);
1506}
1507
1508static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx,
1509 struct scrub_page *spage)
1510{
1511 struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx;
1512 struct scrub_bio *sbio;
1513 int ret;
1514
1515 mutex_lock(&wr_ctx->wr_lock);
1516again:
1517 if (!wr_ctx->wr_curr_bio) {
1518 wr_ctx->wr_curr_bio = kzalloc(sizeof(*wr_ctx->wr_curr_bio),
1519 GFP_NOFS);
1520 if (!wr_ctx->wr_curr_bio) {
1521 mutex_unlock(&wr_ctx->wr_lock);
1522 return -ENOMEM;
1523 }
1524 wr_ctx->wr_curr_bio->sctx = sctx;
1525 wr_ctx->wr_curr_bio->page_count = 0;
1526 }
1527 sbio = wr_ctx->wr_curr_bio;
1528 if (sbio->page_count == 0) {
1529 struct bio *bio;
1530
1531 sbio->physical = spage->physical_for_dev_replace;
1532 sbio->logical = spage->logical;
1533 sbio->dev = wr_ctx->tgtdev;
1534 bio = sbio->bio;
1535 if (!bio) {
Chris Mason9be33952013-05-17 18:30:14 -04001536 bio = btrfs_io_bio_alloc(GFP_NOFS, wr_ctx->pages_per_wr_bio);
Stefan Behrensff023aa2012-11-06 11:43:11 +01001537 if (!bio) {
1538 mutex_unlock(&wr_ctx->wr_lock);
1539 return -ENOMEM;
1540 }
1541 sbio->bio = bio;
1542 }
1543
1544 bio->bi_private = sbio;
1545 bio->bi_end_io = scrub_wr_bio_end_io;
1546 bio->bi_bdev = sbio->dev->bdev;
Kent Overstreet4f024f32013-10-11 15:44:27 -07001547 bio->bi_iter.bi_sector = sbio->physical >> 9;
Stefan Behrensff023aa2012-11-06 11:43:11 +01001548 sbio->err = 0;
1549 } else if (sbio->physical + sbio->page_count * PAGE_SIZE !=
1550 spage->physical_for_dev_replace ||
1551 sbio->logical + sbio->page_count * PAGE_SIZE !=
1552 spage->logical) {
1553 scrub_wr_submit(sctx);
1554 goto again;
1555 }
1556
1557 ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0);
1558 if (ret != PAGE_SIZE) {
1559 if (sbio->page_count < 1) {
1560 bio_put(sbio->bio);
1561 sbio->bio = NULL;
1562 mutex_unlock(&wr_ctx->wr_lock);
1563 return -EIO;
1564 }
1565 scrub_wr_submit(sctx);
1566 goto again;
1567 }
1568
1569 sbio->pagev[sbio->page_count] = spage;
1570 scrub_page_get(spage);
1571 sbio->page_count++;
1572 if (sbio->page_count == wr_ctx->pages_per_wr_bio)
1573 scrub_wr_submit(sctx);
1574 mutex_unlock(&wr_ctx->wr_lock);
1575
1576 return 0;
1577}
1578
1579static void scrub_wr_submit(struct scrub_ctx *sctx)
1580{
1581 struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx;
1582 struct scrub_bio *sbio;
1583
1584 if (!wr_ctx->wr_curr_bio)
1585 return;
1586
1587 sbio = wr_ctx->wr_curr_bio;
1588 wr_ctx->wr_curr_bio = NULL;
1589 WARN_ON(!sbio->bio->bi_bdev);
1590 scrub_pending_bio_inc(sctx);
1591 /* process all writes in a single worker thread. Then the block layer
1592 * orders the requests before sending them to the driver which
1593 * doubled the write performance on spinning disks when measured
1594 * with Linux 3.5 */
1595 btrfsic_submit_bio(WRITE, sbio->bio);
1596}
1597
1598static void scrub_wr_bio_end_io(struct bio *bio, int err)
1599{
1600 struct scrub_bio *sbio = bio->bi_private;
1601 struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info;
1602
1603 sbio->err = err;
1604 sbio->bio = bio;
1605
1606 sbio->work.func = scrub_wr_bio_end_io_worker;
1607 btrfs_queue_worker(&fs_info->scrub_wr_completion_workers, &sbio->work);
1608}
1609
1610static void scrub_wr_bio_end_io_worker(struct btrfs_work *work)
1611{
1612 struct scrub_bio *sbio = container_of(work, struct scrub_bio, work);
1613 struct scrub_ctx *sctx = sbio->sctx;
1614 int i;
1615
1616 WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO);
1617 if (sbio->err) {
1618 struct btrfs_dev_replace *dev_replace =
1619 &sbio->sctx->dev_root->fs_info->dev_replace;
1620
1621 for (i = 0; i < sbio->page_count; i++) {
1622 struct scrub_page *spage = sbio->pagev[i];
1623
1624 spage->io_error = 1;
1625 btrfs_dev_replace_stats_inc(&dev_replace->
1626 num_write_errors);
1627 }
1628 }
1629
1630 for (i = 0; i < sbio->page_count; i++)
1631 scrub_page_put(sbio->pagev[i]);
1632
1633 bio_put(sbio->bio);
1634 kfree(sbio);
1635 scrub_pending_bio_dec(sctx);
1636}
1637
1638static int scrub_checksum(struct scrub_block *sblock)
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001639{
1640 u64 flags;
1641 int ret;
1642
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001643 WARN_ON(sblock->page_count < 1);
1644 flags = sblock->pagev[0]->flags;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001645 ret = 0;
1646 if (flags & BTRFS_EXTENT_FLAG_DATA)
1647 ret = scrub_checksum_data(sblock);
1648 else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)
1649 ret = scrub_checksum_tree_block(sblock);
1650 else if (flags & BTRFS_EXTENT_FLAG_SUPER)
1651 (void)scrub_checksum_super(sblock);
1652 else
1653 WARN_ON(1);
1654 if (ret)
1655 scrub_handle_errored_block(sblock);
Stefan Behrensff023aa2012-11-06 11:43:11 +01001656
1657 return ret;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001658}
1659
1660static int scrub_checksum_data(struct scrub_block *sblock)
1661{
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001662 struct scrub_ctx *sctx = sblock->sctx;
Arne Jansena2de7332011-03-08 14:14:00 +01001663 u8 csum[BTRFS_CSUM_SIZE];
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001664 u8 *on_disk_csum;
1665 struct page *page;
1666 void *buffer;
Arne Jansena2de7332011-03-08 14:14:00 +01001667 u32 crc = ~(u32)0;
1668 int fail = 0;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001669 u64 len;
1670 int index;
Arne Jansena2de7332011-03-08 14:14:00 +01001671
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001672 BUG_ON(sblock->page_count < 1);
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001673 if (!sblock->pagev[0]->have_csum)
Arne Jansena2de7332011-03-08 14:14:00 +01001674 return 0;
1675
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001676 on_disk_csum = sblock->pagev[0]->csum;
1677 page = sblock->pagev[0]->page;
Linus Torvalds9613beb2012-03-30 12:44:29 -07001678 buffer = kmap_atomic(page);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001679
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001680 len = sctx->sectorsize;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001681 index = 0;
1682 for (;;) {
1683 u64 l = min_t(u64, len, PAGE_SIZE);
1684
Liu Bob0496682013-03-14 14:57:45 +00001685 crc = btrfs_csum_data(buffer, crc, l);
Linus Torvalds9613beb2012-03-30 12:44:29 -07001686 kunmap_atomic(buffer);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001687 len -= l;
1688 if (len == 0)
1689 break;
1690 index++;
1691 BUG_ON(index >= sblock->page_count);
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001692 BUG_ON(!sblock->pagev[index]->page);
1693 page = sblock->pagev[index]->page;
Linus Torvalds9613beb2012-03-30 12:44:29 -07001694 buffer = kmap_atomic(page);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001695 }
1696
Arne Jansena2de7332011-03-08 14:14:00 +01001697 btrfs_csum_final(crc, csum);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001698 if (memcmp(csum, on_disk_csum, sctx->csum_size))
Arne Jansena2de7332011-03-08 14:14:00 +01001699 fail = 1;
1700
Arne Jansena2de7332011-03-08 14:14:00 +01001701 return fail;
1702}
1703
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001704static int scrub_checksum_tree_block(struct scrub_block *sblock)
Arne Jansena2de7332011-03-08 14:14:00 +01001705{
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001706 struct scrub_ctx *sctx = sblock->sctx;
Arne Jansena2de7332011-03-08 14:14:00 +01001707 struct btrfs_header *h;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01001708 struct btrfs_root *root = sctx->dev_root;
Arne Jansena2de7332011-03-08 14:14:00 +01001709 struct btrfs_fs_info *fs_info = root->fs_info;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001710 u8 calculated_csum[BTRFS_CSUM_SIZE];
1711 u8 on_disk_csum[BTRFS_CSUM_SIZE];
1712 struct page *page;
1713 void *mapped_buffer;
1714 u64 mapped_size;
1715 void *p;
Arne Jansena2de7332011-03-08 14:14:00 +01001716 u32 crc = ~(u32)0;
1717 int fail = 0;
1718 int crc_fail = 0;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001719 u64 len;
1720 int index;
1721
1722 BUG_ON(sblock->page_count < 1);
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001723 page = sblock->pagev[0]->page;
Linus Torvalds9613beb2012-03-30 12:44:29 -07001724 mapped_buffer = kmap_atomic(page);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001725 h = (struct btrfs_header *)mapped_buffer;
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001726 memcpy(on_disk_csum, h->csum, sctx->csum_size);
Arne Jansena2de7332011-03-08 14:14:00 +01001727
1728 /*
1729 * we don't use the getter functions here, as we
1730 * a) don't have an extent buffer and
1731 * b) the page is already kmapped
1732 */
Arne Jansena2de7332011-03-08 14:14:00 +01001733
Qu Wenruo3cae2102013-07-16 11:19:18 +08001734 if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h))
Arne Jansena2de7332011-03-08 14:14:00 +01001735 ++fail;
1736
Qu Wenruo3cae2102013-07-16 11:19:18 +08001737 if (sblock->pagev[0]->generation != btrfs_stack_header_generation(h))
Arne Jansena2de7332011-03-08 14:14:00 +01001738 ++fail;
1739
1740 if (memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE))
1741 ++fail;
1742
1743 if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid,
1744 BTRFS_UUID_SIZE))
1745 ++fail;
1746
Stefan Behrensff023aa2012-11-06 11:43:11 +01001747 WARN_ON(sctx->nodesize != sctx->leafsize);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001748 len = sctx->nodesize - BTRFS_CSUM_SIZE;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001749 mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE;
1750 p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE;
1751 index = 0;
1752 for (;;) {
1753 u64 l = min_t(u64, len, mapped_size);
1754
Liu Bob0496682013-03-14 14:57:45 +00001755 crc = btrfs_csum_data(p, crc, l);
Linus Torvalds9613beb2012-03-30 12:44:29 -07001756 kunmap_atomic(mapped_buffer);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001757 len -= l;
1758 if (len == 0)
1759 break;
1760 index++;
1761 BUG_ON(index >= sblock->page_count);
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001762 BUG_ON(!sblock->pagev[index]->page);
1763 page = sblock->pagev[index]->page;
Linus Torvalds9613beb2012-03-30 12:44:29 -07001764 mapped_buffer = kmap_atomic(page);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001765 mapped_size = PAGE_SIZE;
1766 p = mapped_buffer;
1767 }
1768
1769 btrfs_csum_final(crc, calculated_csum);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001770 if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size))
Arne Jansena2de7332011-03-08 14:14:00 +01001771 ++crc_fail;
1772
Arne Jansena2de7332011-03-08 14:14:00 +01001773 return fail || crc_fail;
1774}
1775
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001776static int scrub_checksum_super(struct scrub_block *sblock)
Arne Jansena2de7332011-03-08 14:14:00 +01001777{
1778 struct btrfs_super_block *s;
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001779 struct scrub_ctx *sctx = sblock->sctx;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01001780 struct btrfs_root *root = sctx->dev_root;
Arne Jansena2de7332011-03-08 14:14:00 +01001781 struct btrfs_fs_info *fs_info = root->fs_info;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001782 u8 calculated_csum[BTRFS_CSUM_SIZE];
1783 u8 on_disk_csum[BTRFS_CSUM_SIZE];
1784 struct page *page;
1785 void *mapped_buffer;
1786 u64 mapped_size;
1787 void *p;
Arne Jansena2de7332011-03-08 14:14:00 +01001788 u32 crc = ~(u32)0;
Stefan Behrens442a4f62012-05-25 16:06:08 +02001789 int fail_gen = 0;
1790 int fail_cor = 0;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001791 u64 len;
1792 int index;
Arne Jansena2de7332011-03-08 14:14:00 +01001793
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001794 BUG_ON(sblock->page_count < 1);
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001795 page = sblock->pagev[0]->page;
Linus Torvalds9613beb2012-03-30 12:44:29 -07001796 mapped_buffer = kmap_atomic(page);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001797 s = (struct btrfs_super_block *)mapped_buffer;
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001798 memcpy(on_disk_csum, s->csum, sctx->csum_size);
Arne Jansena2de7332011-03-08 14:14:00 +01001799
Qu Wenruo3cae2102013-07-16 11:19:18 +08001800 if (sblock->pagev[0]->logical != btrfs_super_bytenr(s))
Stefan Behrens442a4f62012-05-25 16:06:08 +02001801 ++fail_cor;
Arne Jansena2de7332011-03-08 14:14:00 +01001802
Qu Wenruo3cae2102013-07-16 11:19:18 +08001803 if (sblock->pagev[0]->generation != btrfs_super_generation(s))
Stefan Behrens442a4f62012-05-25 16:06:08 +02001804 ++fail_gen;
Arne Jansena2de7332011-03-08 14:14:00 +01001805
1806 if (memcmp(s->fsid, fs_info->fsid, BTRFS_UUID_SIZE))
Stefan Behrens442a4f62012-05-25 16:06:08 +02001807 ++fail_cor;
Arne Jansena2de7332011-03-08 14:14:00 +01001808
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001809 len = BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE;
1810 mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE;
1811 p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE;
1812 index = 0;
1813 for (;;) {
1814 u64 l = min_t(u64, len, mapped_size);
1815
Liu Bob0496682013-03-14 14:57:45 +00001816 crc = btrfs_csum_data(p, crc, l);
Linus Torvalds9613beb2012-03-30 12:44:29 -07001817 kunmap_atomic(mapped_buffer);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001818 len -= l;
1819 if (len == 0)
1820 break;
1821 index++;
1822 BUG_ON(index >= sblock->page_count);
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001823 BUG_ON(!sblock->pagev[index]->page);
1824 page = sblock->pagev[index]->page;
Linus Torvalds9613beb2012-03-30 12:44:29 -07001825 mapped_buffer = kmap_atomic(page);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001826 mapped_size = PAGE_SIZE;
1827 p = mapped_buffer;
1828 }
1829
1830 btrfs_csum_final(crc, calculated_csum);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001831 if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size))
Stefan Behrens442a4f62012-05-25 16:06:08 +02001832 ++fail_cor;
Arne Jansena2de7332011-03-08 14:14:00 +01001833
Stefan Behrens442a4f62012-05-25 16:06:08 +02001834 if (fail_cor + fail_gen) {
Arne Jansena2de7332011-03-08 14:14:00 +01001835 /*
1836 * if we find an error in a super block, we just report it.
1837 * They will get written with the next transaction commit
1838 * anyway
1839 */
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001840 spin_lock(&sctx->stat_lock);
1841 ++sctx->stat.super_errors;
1842 spin_unlock(&sctx->stat_lock);
Stefan Behrens442a4f62012-05-25 16:06:08 +02001843 if (fail_cor)
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001844 btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev,
Stefan Behrens442a4f62012-05-25 16:06:08 +02001845 BTRFS_DEV_STAT_CORRUPTION_ERRS);
1846 else
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001847 btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev,
Stefan Behrens442a4f62012-05-25 16:06:08 +02001848 BTRFS_DEV_STAT_GENERATION_ERRS);
Arne Jansena2de7332011-03-08 14:14:00 +01001849 }
1850
Stefan Behrens442a4f62012-05-25 16:06:08 +02001851 return fail_cor + fail_gen;
Arne Jansena2de7332011-03-08 14:14:00 +01001852}
1853
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001854static void scrub_block_get(struct scrub_block *sblock)
1855{
1856 atomic_inc(&sblock->ref_count);
1857}
1858
1859static void scrub_block_put(struct scrub_block *sblock)
1860{
1861 if (atomic_dec_and_test(&sblock->ref_count)) {
1862 int i;
1863
1864 for (i = 0; i < sblock->page_count; i++)
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001865 scrub_page_put(sblock->pagev[i]);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001866 kfree(sblock);
1867 }
1868}
1869
Stefan Behrens7a9e9982012-11-02 14:58:04 +01001870static void scrub_page_get(struct scrub_page *spage)
1871{
1872 atomic_inc(&spage->ref_count);
1873}
1874
1875static void scrub_page_put(struct scrub_page *spage)
1876{
1877 if (atomic_dec_and_test(&spage->ref_count)) {
1878 if (spage->page)
1879 __free_page(spage->page);
1880 kfree(spage);
1881 }
1882}
1883
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001884static void scrub_submit(struct scrub_ctx *sctx)
Arne Jansena2de7332011-03-08 14:14:00 +01001885{
1886 struct scrub_bio *sbio;
1887
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001888 if (sctx->curr == -1)
Stefan Behrens1623ede2012-03-27 14:21:26 -04001889 return;
Arne Jansena2de7332011-03-08 14:14:00 +01001890
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001891 sbio = sctx->bios[sctx->curr];
1892 sctx->curr = -1;
Stefan Behrensb6bfebc2012-11-02 16:44:58 +01001893 scrub_pending_bio_inc(sctx);
Arne Jansena2de7332011-03-08 14:14:00 +01001894
Stefan Behrensff023aa2012-11-06 11:43:11 +01001895 if (!sbio->bio->bi_bdev) {
1896 /*
1897 * this case should not happen. If btrfs_map_block() is
1898 * wrong, it could happen for dev-replace operations on
1899 * missing devices when no mirrors are available, but in
1900 * this case it should already fail the mount.
1901 * This case is handled correctly (but _very_ slowly).
1902 */
1903 printk_ratelimited(KERN_WARNING
Frank Holtonefe120a2013-12-20 11:37:06 -05001904 "BTRFS: scrub_submit(bio bdev == NULL) is unexpected!\n");
Stefan Behrensff023aa2012-11-06 11:43:11 +01001905 bio_endio(sbio->bio, -EIO);
1906 } else {
1907 btrfsic_submit_bio(READ, sbio->bio);
1908 }
Arne Jansena2de7332011-03-08 14:14:00 +01001909}
1910
Stefan Behrensff023aa2012-11-06 11:43:11 +01001911static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx,
1912 struct scrub_page *spage)
Arne Jansena2de7332011-03-08 14:14:00 +01001913{
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001914 struct scrub_block *sblock = spage->sblock;
Arne Jansena2de7332011-03-08 14:14:00 +01001915 struct scrub_bio *sbio;
Arne Jansen69f4cb52011-11-11 08:17:10 -05001916 int ret;
Arne Jansena2de7332011-03-08 14:14:00 +01001917
1918again:
1919 /*
1920 * grab a fresh bio or wait for one to become available
1921 */
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001922 while (sctx->curr == -1) {
1923 spin_lock(&sctx->list_lock);
1924 sctx->curr = sctx->first_free;
1925 if (sctx->curr != -1) {
1926 sctx->first_free = sctx->bios[sctx->curr]->next_free;
1927 sctx->bios[sctx->curr]->next_free = -1;
1928 sctx->bios[sctx->curr]->page_count = 0;
1929 spin_unlock(&sctx->list_lock);
Arne Jansena2de7332011-03-08 14:14:00 +01001930 } else {
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001931 spin_unlock(&sctx->list_lock);
1932 wait_event(sctx->list_wait, sctx->first_free != -1);
Arne Jansena2de7332011-03-08 14:14:00 +01001933 }
1934 }
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001935 sbio = sctx->bios[sctx->curr];
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001936 if (sbio->page_count == 0) {
Arne Jansen69f4cb52011-11-11 08:17:10 -05001937 struct bio *bio;
1938
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001939 sbio->physical = spage->physical;
1940 sbio->logical = spage->logical;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01001941 sbio->dev = spage->dev;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001942 bio = sbio->bio;
1943 if (!bio) {
Chris Mason9be33952013-05-17 18:30:14 -04001944 bio = btrfs_io_bio_alloc(GFP_NOFS, sctx->pages_per_rd_bio);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001945 if (!bio)
1946 return -ENOMEM;
1947 sbio->bio = bio;
1948 }
Arne Jansen69f4cb52011-11-11 08:17:10 -05001949
1950 bio->bi_private = sbio;
1951 bio->bi_end_io = scrub_bio_end_io;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01001952 bio->bi_bdev = sbio->dev->bdev;
Kent Overstreet4f024f32013-10-11 15:44:27 -07001953 bio->bi_iter.bi_sector = sbio->physical >> 9;
Arne Jansen69f4cb52011-11-11 08:17:10 -05001954 sbio->err = 0;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001955 } else if (sbio->physical + sbio->page_count * PAGE_SIZE !=
1956 spage->physical ||
1957 sbio->logical + sbio->page_count * PAGE_SIZE !=
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01001958 spage->logical ||
1959 sbio->dev != spage->dev) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001960 scrub_submit(sctx);
Arne Jansen69f4cb52011-11-11 08:17:10 -05001961 goto again;
1962 }
1963
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001964 sbio->pagev[sbio->page_count] = spage;
1965 ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0);
1966 if (ret != PAGE_SIZE) {
1967 if (sbio->page_count < 1) {
1968 bio_put(sbio->bio);
1969 sbio->bio = NULL;
1970 return -EIO;
1971 }
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001972 scrub_submit(sctx);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001973 goto again;
Arne Jansena2de7332011-03-08 14:14:00 +01001974 }
Arne Jansen1bc87792011-05-28 21:57:55 +02001975
Stefan Behrensff023aa2012-11-06 11:43:11 +01001976 scrub_block_get(sblock); /* one for the page added to the bio */
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001977 atomic_inc(&sblock->outstanding_pages);
1978 sbio->page_count++;
Stefan Behrensff023aa2012-11-06 11:43:11 +01001979 if (sbio->page_count == sctx->pages_per_rd_bio)
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001980 scrub_submit(sctx);
Arne Jansena2de7332011-03-08 14:14:00 +01001981
1982 return 0;
1983}
1984
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001985static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01001986 u64 physical, struct btrfs_device *dev, u64 flags,
Stefan Behrensff023aa2012-11-06 11:43:11 +01001987 u64 gen, int mirror_num, u8 *csum, int force,
1988 u64 physical_for_dev_replace)
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001989{
1990 struct scrub_block *sblock;
1991 int index;
1992
1993 sblock = kzalloc(sizeof(*sblock), GFP_NOFS);
1994 if (!sblock) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +01001995 spin_lock(&sctx->stat_lock);
1996 sctx->stat.malloc_errors++;
1997 spin_unlock(&sctx->stat_lock);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04001998 return -ENOMEM;
1999 }
2000
Stefan Behrens7a9e9982012-11-02 14:58:04 +01002001 /* one ref inside this function, plus one for each page added to
2002 * a bio later on */
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002003 atomic_set(&sblock->ref_count, 1);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002004 sblock->sctx = sctx;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002005 sblock->no_io_error_seen = 1;
2006
2007 for (index = 0; len > 0; index++) {
Stefan Behrens7a9e9982012-11-02 14:58:04 +01002008 struct scrub_page *spage;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002009 u64 l = min_t(u64, len, PAGE_SIZE);
2010
Stefan Behrens7a9e9982012-11-02 14:58:04 +01002011 spage = kzalloc(sizeof(*spage), GFP_NOFS);
2012 if (!spage) {
2013leave_nomem:
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002014 spin_lock(&sctx->stat_lock);
2015 sctx->stat.malloc_errors++;
2016 spin_unlock(&sctx->stat_lock);
Stefan Behrens7a9e9982012-11-02 14:58:04 +01002017 scrub_block_put(sblock);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002018 return -ENOMEM;
2019 }
Stefan Behrens7a9e9982012-11-02 14:58:04 +01002020 BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK);
2021 scrub_page_get(spage);
2022 sblock->pagev[index] = spage;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002023 spage->sblock = sblock;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002024 spage->dev = dev;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002025 spage->flags = flags;
2026 spage->generation = gen;
2027 spage->logical = logical;
2028 spage->physical = physical;
Stefan Behrensff023aa2012-11-06 11:43:11 +01002029 spage->physical_for_dev_replace = physical_for_dev_replace;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002030 spage->mirror_num = mirror_num;
2031 if (csum) {
2032 spage->have_csum = 1;
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002033 memcpy(spage->csum, csum, sctx->csum_size);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002034 } else {
2035 spage->have_csum = 0;
2036 }
2037 sblock->page_count++;
Stefan Behrens7a9e9982012-11-02 14:58:04 +01002038 spage->page = alloc_page(GFP_NOFS);
2039 if (!spage->page)
2040 goto leave_nomem;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002041 len -= l;
2042 logical += l;
2043 physical += l;
Stefan Behrensff023aa2012-11-06 11:43:11 +01002044 physical_for_dev_replace += l;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002045 }
2046
Stefan Behrens7a9e9982012-11-02 14:58:04 +01002047 WARN_ON(sblock->page_count == 0);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002048 for (index = 0; index < sblock->page_count; index++) {
Stefan Behrens7a9e9982012-11-02 14:58:04 +01002049 struct scrub_page *spage = sblock->pagev[index];
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002050 int ret;
2051
Stefan Behrensff023aa2012-11-06 11:43:11 +01002052 ret = scrub_add_page_to_rd_bio(sctx, spage);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002053 if (ret) {
2054 scrub_block_put(sblock);
2055 return ret;
2056 }
2057 }
2058
2059 if (force)
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002060 scrub_submit(sctx);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002061
2062 /* last one frees, either here or in bio completion for last page */
2063 scrub_block_put(sblock);
2064 return 0;
2065}
2066
2067static void scrub_bio_end_io(struct bio *bio, int err)
2068{
2069 struct scrub_bio *sbio = bio->bi_private;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002070 struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002071
2072 sbio->err = err;
2073 sbio->bio = bio;
2074
2075 btrfs_queue_worker(&fs_info->scrub_workers, &sbio->work);
2076}
2077
2078static void scrub_bio_end_io_worker(struct btrfs_work *work)
2079{
2080 struct scrub_bio *sbio = container_of(work, struct scrub_bio, work);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002081 struct scrub_ctx *sctx = sbio->sctx;
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002082 int i;
2083
Stefan Behrensff023aa2012-11-06 11:43:11 +01002084 BUG_ON(sbio->page_count > SCRUB_PAGES_PER_RD_BIO);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002085 if (sbio->err) {
2086 for (i = 0; i < sbio->page_count; i++) {
2087 struct scrub_page *spage = sbio->pagev[i];
2088
2089 spage->io_error = 1;
2090 spage->sblock->no_io_error_seen = 0;
2091 }
2092 }
2093
2094 /* now complete the scrub_block items that have all pages completed */
2095 for (i = 0; i < sbio->page_count; i++) {
2096 struct scrub_page *spage = sbio->pagev[i];
2097 struct scrub_block *sblock = spage->sblock;
2098
2099 if (atomic_dec_and_test(&sblock->outstanding_pages))
2100 scrub_block_complete(sblock);
2101 scrub_block_put(sblock);
2102 }
2103
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002104 bio_put(sbio->bio);
2105 sbio->bio = NULL;
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002106 spin_lock(&sctx->list_lock);
2107 sbio->next_free = sctx->first_free;
2108 sctx->first_free = sbio->index;
2109 spin_unlock(&sctx->list_lock);
Stefan Behrensff023aa2012-11-06 11:43:11 +01002110
2111 if (sctx->is_dev_replace &&
2112 atomic_read(&sctx->wr_ctx.flush_all_writes)) {
2113 mutex_lock(&sctx->wr_ctx.wr_lock);
2114 scrub_wr_submit(sctx);
2115 mutex_unlock(&sctx->wr_ctx.wr_lock);
2116 }
2117
Stefan Behrensb6bfebc2012-11-02 16:44:58 +01002118 scrub_pending_bio_dec(sctx);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002119}
2120
2121static void scrub_block_complete(struct scrub_block *sblock)
2122{
Stefan Behrensff023aa2012-11-06 11:43:11 +01002123 if (!sblock->no_io_error_seen) {
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002124 scrub_handle_errored_block(sblock);
Stefan Behrensff023aa2012-11-06 11:43:11 +01002125 } else {
2126 /*
2127 * if has checksum error, write via repair mechanism in
2128 * dev replace case, otherwise write here in dev replace
2129 * case.
2130 */
2131 if (!scrub_checksum(sblock) && sblock->sctx->is_dev_replace)
2132 scrub_write_block_to_dev_replace(sblock);
2133 }
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002134}
2135
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002136static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u64 len,
Arne Jansena2de7332011-03-08 14:14:00 +01002137 u8 *csum)
2138{
2139 struct btrfs_ordered_sum *sum = NULL;
Miao Xief51a4a12013-06-19 10:36:09 +08002140 unsigned long index;
Arne Jansena2de7332011-03-08 14:14:00 +01002141 unsigned long num_sectors;
Arne Jansena2de7332011-03-08 14:14:00 +01002142
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002143 while (!list_empty(&sctx->csum_list)) {
2144 sum = list_first_entry(&sctx->csum_list,
Arne Jansena2de7332011-03-08 14:14:00 +01002145 struct btrfs_ordered_sum, list);
2146 if (sum->bytenr > logical)
2147 return 0;
2148 if (sum->bytenr + sum->len > logical)
2149 break;
2150
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002151 ++sctx->stat.csum_discards;
Arne Jansena2de7332011-03-08 14:14:00 +01002152 list_del(&sum->list);
2153 kfree(sum);
2154 sum = NULL;
2155 }
2156 if (!sum)
2157 return 0;
2158
Miao Xief51a4a12013-06-19 10:36:09 +08002159 index = ((u32)(logical - sum->bytenr)) / sctx->sectorsize;
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002160 num_sectors = sum->len / sctx->sectorsize;
Miao Xief51a4a12013-06-19 10:36:09 +08002161 memcpy(csum, sum->sums + index, sctx->csum_size);
2162 if (index == num_sectors - 1) {
Arne Jansena2de7332011-03-08 14:14:00 +01002163 list_del(&sum->list);
2164 kfree(sum);
2165 }
Miao Xief51a4a12013-06-19 10:36:09 +08002166 return 1;
Arne Jansena2de7332011-03-08 14:14:00 +01002167}
2168
2169/* scrub extent tries to collect up to 64 kB for each bio */
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002170static int scrub_extent(struct scrub_ctx *sctx, u64 logical, u64 len,
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002171 u64 physical, struct btrfs_device *dev, u64 flags,
Stefan Behrensff023aa2012-11-06 11:43:11 +01002172 u64 gen, int mirror_num, u64 physical_for_dev_replace)
Arne Jansena2de7332011-03-08 14:14:00 +01002173{
2174 int ret;
2175 u8 csum[BTRFS_CSUM_SIZE];
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002176 u32 blocksize;
2177
2178 if (flags & BTRFS_EXTENT_FLAG_DATA) {
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002179 blocksize = sctx->sectorsize;
2180 spin_lock(&sctx->stat_lock);
2181 sctx->stat.data_extents_scrubbed++;
2182 sctx->stat.data_bytes_scrubbed += len;
2183 spin_unlock(&sctx->stat_lock);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002184 } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
Stefan Behrensff023aa2012-11-06 11:43:11 +01002185 WARN_ON(sctx->nodesize != sctx->leafsize);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002186 blocksize = sctx->nodesize;
2187 spin_lock(&sctx->stat_lock);
2188 sctx->stat.tree_extents_scrubbed++;
2189 sctx->stat.tree_bytes_scrubbed += len;
2190 spin_unlock(&sctx->stat_lock);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002191 } else {
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002192 blocksize = sctx->sectorsize;
Stefan Behrensff023aa2012-11-06 11:43:11 +01002193 WARN_ON(1);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002194 }
Arne Jansena2de7332011-03-08 14:14:00 +01002195
2196 while (len) {
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002197 u64 l = min_t(u64, len, blocksize);
Arne Jansena2de7332011-03-08 14:14:00 +01002198 int have_csum = 0;
2199
2200 if (flags & BTRFS_EXTENT_FLAG_DATA) {
2201 /* push csums to sbio */
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002202 have_csum = scrub_find_csum(sctx, logical, l, csum);
Arne Jansena2de7332011-03-08 14:14:00 +01002203 if (have_csum == 0)
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002204 ++sctx->stat.no_csum;
Stefan Behrensff023aa2012-11-06 11:43:11 +01002205 if (sctx->is_dev_replace && !have_csum) {
2206 ret = copy_nocow_pages(sctx, logical, l,
2207 mirror_num,
2208 physical_for_dev_replace);
2209 goto behind_scrub_pages;
2210 }
Arne Jansena2de7332011-03-08 14:14:00 +01002211 }
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002212 ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen,
Stefan Behrensff023aa2012-11-06 11:43:11 +01002213 mirror_num, have_csum ? csum : NULL, 0,
2214 physical_for_dev_replace);
2215behind_scrub_pages:
Arne Jansena2de7332011-03-08 14:14:00 +01002216 if (ret)
2217 return ret;
2218 len -= l;
2219 logical += l;
2220 physical += l;
Stefan Behrensff023aa2012-11-06 11:43:11 +01002221 physical_for_dev_replace += l;
Arne Jansena2de7332011-03-08 14:14:00 +01002222 }
2223 return 0;
2224}
2225
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002226static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002227 struct map_lookup *map,
2228 struct btrfs_device *scrub_dev,
Stefan Behrensff023aa2012-11-06 11:43:11 +01002229 int num, u64 base, u64 length,
2230 int is_dev_replace)
Arne Jansena2de7332011-03-08 14:14:00 +01002231{
2232 struct btrfs_path *path;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002233 struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
Arne Jansena2de7332011-03-08 14:14:00 +01002234 struct btrfs_root *root = fs_info->extent_root;
2235 struct btrfs_root *csum_root = fs_info->csum_root;
2236 struct btrfs_extent_item *extent;
Arne Jansene7786c32011-05-28 20:58:38 +00002237 struct blk_plug plug;
Arne Jansena2de7332011-03-08 14:14:00 +01002238 u64 flags;
2239 int ret;
2240 int slot;
Arne Jansena2de7332011-03-08 14:14:00 +01002241 u64 nstripes;
Arne Jansena2de7332011-03-08 14:14:00 +01002242 struct extent_buffer *l;
2243 struct btrfs_key key;
2244 u64 physical;
2245 u64 logical;
Liu Bo625f1c8d2013-04-27 02:56:57 +00002246 u64 logic_end;
Arne Jansena2de7332011-03-08 14:14:00 +01002247 u64 generation;
Jan Schmidte12fa9c2011-06-17 15:55:21 +02002248 int mirror_num;
Arne Jansen7a262852011-06-10 12:39:23 +02002249 struct reada_control *reada1;
2250 struct reada_control *reada2;
2251 struct btrfs_key key_start;
2252 struct btrfs_key key_end;
Arne Jansena2de7332011-03-08 14:14:00 +01002253 u64 increment = map->stripe_len;
2254 u64 offset;
Stefan Behrensff023aa2012-11-06 11:43:11 +01002255 u64 extent_logical;
2256 u64 extent_physical;
2257 u64 extent_len;
2258 struct btrfs_device *extent_dev;
2259 int extent_mirror_num;
Liu Bo625f1c8d2013-04-27 02:56:57 +00002260 int stop_loop;
Arne Jansena2de7332011-03-08 14:14:00 +01002261
David Woodhouse53b381b2013-01-29 18:40:14 -05002262 if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
2263 BTRFS_BLOCK_GROUP_RAID6)) {
2264 if (num >= nr_data_stripes(map)) {
2265 return 0;
2266 }
2267 }
2268
Arne Jansena2de7332011-03-08 14:14:00 +01002269 nstripes = length;
2270 offset = 0;
2271 do_div(nstripes, map->stripe_len);
2272 if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
2273 offset = map->stripe_len * num;
2274 increment = map->stripe_len * map->num_stripes;
Jan Schmidt193ea742011-06-13 19:56:54 +02002275 mirror_num = 1;
Arne Jansena2de7332011-03-08 14:14:00 +01002276 } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
2277 int factor = map->num_stripes / map->sub_stripes;
2278 offset = map->stripe_len * (num / map->sub_stripes);
2279 increment = map->stripe_len * factor;
Jan Schmidt193ea742011-06-13 19:56:54 +02002280 mirror_num = num % map->sub_stripes + 1;
Arne Jansena2de7332011-03-08 14:14:00 +01002281 } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
2282 increment = map->stripe_len;
Jan Schmidt193ea742011-06-13 19:56:54 +02002283 mirror_num = num % map->num_stripes + 1;
Arne Jansena2de7332011-03-08 14:14:00 +01002284 } else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
2285 increment = map->stripe_len;
Jan Schmidt193ea742011-06-13 19:56:54 +02002286 mirror_num = num % map->num_stripes + 1;
Arne Jansena2de7332011-03-08 14:14:00 +01002287 } else {
2288 increment = map->stripe_len;
Jan Schmidt193ea742011-06-13 19:56:54 +02002289 mirror_num = 1;
Arne Jansena2de7332011-03-08 14:14:00 +01002290 }
2291
2292 path = btrfs_alloc_path();
2293 if (!path)
2294 return -ENOMEM;
2295
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002296 /*
2297 * work on commit root. The related disk blocks are static as
2298 * long as COW is applied. This means, it is save to rewrite
2299 * them to repair disk errors without any race conditions
2300 */
Arne Jansena2de7332011-03-08 14:14:00 +01002301 path->search_commit_root = 1;
2302 path->skip_locking = 1;
2303
2304 /*
Arne Jansen7a262852011-06-10 12:39:23 +02002305 * trigger the readahead for extent tree csum tree and wait for
2306 * completion. During readahead, the scrub is officially paused
2307 * to not hold off transaction commits
Arne Jansena2de7332011-03-08 14:14:00 +01002308 */
2309 logical = base + offset;
Arne Jansena2de7332011-03-08 14:14:00 +01002310
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002311 wait_event(sctx->list_wait,
Stefan Behrensb6bfebc2012-11-02 16:44:58 +01002312 atomic_read(&sctx->bios_in_flight) == 0);
Wang Shilongcb7ab022013-12-04 21:16:53 +08002313 scrub_blocked_if_needed(fs_info);
Arne Jansena2de7332011-03-08 14:14:00 +01002314
Arne Jansen7a262852011-06-10 12:39:23 +02002315 /* FIXME it might be better to start readahead at commit root */
2316 key_start.objectid = logical;
2317 key_start.type = BTRFS_EXTENT_ITEM_KEY;
2318 key_start.offset = (u64)0;
2319 key_end.objectid = base + offset + nstripes * increment;
Josef Bacik3173a182013-03-07 14:22:04 -05002320 key_end.type = BTRFS_METADATA_ITEM_KEY;
2321 key_end.offset = (u64)-1;
Arne Jansen7a262852011-06-10 12:39:23 +02002322 reada1 = btrfs_reada_add(root, &key_start, &key_end);
Arne Jansena2de7332011-03-08 14:14:00 +01002323
Arne Jansen7a262852011-06-10 12:39:23 +02002324 key_start.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
2325 key_start.type = BTRFS_EXTENT_CSUM_KEY;
2326 key_start.offset = logical;
2327 key_end.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
2328 key_end.type = BTRFS_EXTENT_CSUM_KEY;
2329 key_end.offset = base + offset + nstripes * increment;
2330 reada2 = btrfs_reada_add(csum_root, &key_start, &key_end);
Arne Jansena2de7332011-03-08 14:14:00 +01002331
Arne Jansen7a262852011-06-10 12:39:23 +02002332 if (!IS_ERR(reada1))
2333 btrfs_reada_wait(reada1);
2334 if (!IS_ERR(reada2))
2335 btrfs_reada_wait(reada2);
Arne Jansena2de7332011-03-08 14:14:00 +01002336
Arne Jansena2de7332011-03-08 14:14:00 +01002337
2338 /*
2339 * collect all data csums for the stripe to avoid seeking during
2340 * the scrub. This might currently (crc32) end up to be about 1MB
2341 */
Arne Jansene7786c32011-05-28 20:58:38 +00002342 blk_start_plug(&plug);
Arne Jansena2de7332011-03-08 14:14:00 +01002343
Arne Jansena2de7332011-03-08 14:14:00 +01002344 /*
2345 * now find all extents for each stripe and scrub them
2346 */
Arne Jansen7a262852011-06-10 12:39:23 +02002347 logical = base + offset;
2348 physical = map->stripes[num].physical;
Liu Bo625f1c8d2013-04-27 02:56:57 +00002349 logic_end = logical + increment * nstripes;
Arne Jansena2de7332011-03-08 14:14:00 +01002350 ret = 0;
Liu Bo625f1c8d2013-04-27 02:56:57 +00002351 while (logical < logic_end) {
Arne Jansena2de7332011-03-08 14:14:00 +01002352 /*
2353 * canceled?
2354 */
2355 if (atomic_read(&fs_info->scrub_cancel_req) ||
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002356 atomic_read(&sctx->cancel_req)) {
Arne Jansena2de7332011-03-08 14:14:00 +01002357 ret = -ECANCELED;
2358 goto out;
2359 }
2360 /*
2361 * check to see if we have to pause
2362 */
2363 if (atomic_read(&fs_info->scrub_pause_req)) {
2364 /* push queued extents */
Stefan Behrensff023aa2012-11-06 11:43:11 +01002365 atomic_set(&sctx->wr_ctx.flush_all_writes, 1);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002366 scrub_submit(sctx);
Stefan Behrensff023aa2012-11-06 11:43:11 +01002367 mutex_lock(&sctx->wr_ctx.wr_lock);
2368 scrub_wr_submit(sctx);
2369 mutex_unlock(&sctx->wr_ctx.wr_lock);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002370 wait_event(sctx->list_wait,
Stefan Behrensb6bfebc2012-11-02 16:44:58 +01002371 atomic_read(&sctx->bios_in_flight) == 0);
Stefan Behrensff023aa2012-11-06 11:43:11 +01002372 atomic_set(&sctx->wr_ctx.flush_all_writes, 0);
Wang Shilong3cb09292013-12-04 21:15:19 +08002373 scrub_blocked_if_needed(fs_info);
Arne Jansena2de7332011-03-08 14:14:00 +01002374 }
2375
Wang Shilong7c76edb2014-01-12 21:38:32 +08002376 if (btrfs_fs_incompat(fs_info, SKINNY_METADATA))
2377 key.type = BTRFS_METADATA_ITEM_KEY;
2378 else
2379 key.type = BTRFS_EXTENT_ITEM_KEY;
Arne Jansena2de7332011-03-08 14:14:00 +01002380 key.objectid = logical;
Liu Bo625f1c8d2013-04-27 02:56:57 +00002381 key.offset = (u64)-1;
Arne Jansena2de7332011-03-08 14:14:00 +01002382
2383 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2384 if (ret < 0)
2385 goto out;
Josef Bacik3173a182013-03-07 14:22:04 -05002386
Arne Jansen8c510322011-06-03 10:09:26 +02002387 if (ret > 0) {
Wang Shilongade2e0b2014-01-12 21:38:33 +08002388 ret = btrfs_previous_extent_item(root, path, 0);
Arne Jansena2de7332011-03-08 14:14:00 +01002389 if (ret < 0)
2390 goto out;
Arne Jansen8c510322011-06-03 10:09:26 +02002391 if (ret > 0) {
2392 /* there's no smaller item, so stick with the
2393 * larger one */
2394 btrfs_release_path(path);
2395 ret = btrfs_search_slot(NULL, root, &key,
2396 path, 0, 0);
2397 if (ret < 0)
2398 goto out;
2399 }
Arne Jansena2de7332011-03-08 14:14:00 +01002400 }
2401
Liu Bo625f1c8d2013-04-27 02:56:57 +00002402 stop_loop = 0;
Arne Jansena2de7332011-03-08 14:14:00 +01002403 while (1) {
Josef Bacik3173a182013-03-07 14:22:04 -05002404 u64 bytes;
2405
Arne Jansena2de7332011-03-08 14:14:00 +01002406 l = path->nodes[0];
2407 slot = path->slots[0];
2408 if (slot >= btrfs_header_nritems(l)) {
2409 ret = btrfs_next_leaf(root, path);
2410 if (ret == 0)
2411 continue;
2412 if (ret < 0)
2413 goto out;
2414
Liu Bo625f1c8d2013-04-27 02:56:57 +00002415 stop_loop = 1;
Arne Jansena2de7332011-03-08 14:14:00 +01002416 break;
2417 }
2418 btrfs_item_key_to_cpu(l, &key, slot);
2419
Josef Bacik3173a182013-03-07 14:22:04 -05002420 if (key.type == BTRFS_METADATA_ITEM_KEY)
2421 bytes = root->leafsize;
2422 else
2423 bytes = key.offset;
2424
2425 if (key.objectid + bytes <= logical)
Arne Jansena2de7332011-03-08 14:14:00 +01002426 goto next;
2427
Liu Bo625f1c8d2013-04-27 02:56:57 +00002428 if (key.type != BTRFS_EXTENT_ITEM_KEY &&
2429 key.type != BTRFS_METADATA_ITEM_KEY)
2430 goto next;
Arne Jansena2de7332011-03-08 14:14:00 +01002431
Liu Bo625f1c8d2013-04-27 02:56:57 +00002432 if (key.objectid >= logical + map->stripe_len) {
2433 /* out of this device extent */
2434 if (key.objectid >= logic_end)
2435 stop_loop = 1;
2436 break;
2437 }
Arne Jansena2de7332011-03-08 14:14:00 +01002438
2439 extent = btrfs_item_ptr(l, slot,
2440 struct btrfs_extent_item);
2441 flags = btrfs_extent_flags(l, extent);
2442 generation = btrfs_extent_generation(l, extent);
2443
2444 if (key.objectid < logical &&
2445 (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) {
Frank Holtonefe120a2013-12-20 11:37:06 -05002446 btrfs_err(fs_info,
2447 "scrub: tree block %llu spanning "
2448 "stripes, ignored. logical=%llu",
Geert Uytterhoevenc1c9ff72013-08-20 13:20:07 +02002449 key.objectid, logical);
Arne Jansena2de7332011-03-08 14:14:00 +01002450 goto next;
2451 }
2452
Liu Bo625f1c8d2013-04-27 02:56:57 +00002453again:
2454 extent_logical = key.objectid;
2455 extent_len = bytes;
2456
Arne Jansena2de7332011-03-08 14:14:00 +01002457 /*
2458 * trim extent to this stripe
2459 */
Liu Bo625f1c8d2013-04-27 02:56:57 +00002460 if (extent_logical < logical) {
2461 extent_len -= logical - extent_logical;
2462 extent_logical = logical;
Arne Jansena2de7332011-03-08 14:14:00 +01002463 }
Liu Bo625f1c8d2013-04-27 02:56:57 +00002464 if (extent_logical + extent_len >
Arne Jansena2de7332011-03-08 14:14:00 +01002465 logical + map->stripe_len) {
Liu Bo625f1c8d2013-04-27 02:56:57 +00002466 extent_len = logical + map->stripe_len -
2467 extent_logical;
Arne Jansena2de7332011-03-08 14:14:00 +01002468 }
2469
Liu Bo625f1c8d2013-04-27 02:56:57 +00002470 extent_physical = extent_logical - logical + physical;
Stefan Behrensff023aa2012-11-06 11:43:11 +01002471 extent_dev = scrub_dev;
2472 extent_mirror_num = mirror_num;
2473 if (is_dev_replace)
2474 scrub_remap_extent(fs_info, extent_logical,
2475 extent_len, &extent_physical,
2476 &extent_dev,
2477 &extent_mirror_num);
Liu Bo625f1c8d2013-04-27 02:56:57 +00002478
2479 ret = btrfs_lookup_csums_range(csum_root, logical,
2480 logical + map->stripe_len - 1,
2481 &sctx->csum_list, 1);
Arne Jansena2de7332011-03-08 14:14:00 +01002482 if (ret)
2483 goto out;
2484
Liu Bo625f1c8d2013-04-27 02:56:57 +00002485 ret = scrub_extent(sctx, extent_logical, extent_len,
2486 extent_physical, extent_dev, flags,
2487 generation, extent_mirror_num,
Stefan Behrens115930c2013-07-04 16:14:23 +02002488 extent_logical - logical + physical);
Liu Bo625f1c8d2013-04-27 02:56:57 +00002489 if (ret)
2490 goto out;
2491
Josef Bacikd88d46c2013-06-10 12:59:04 +00002492 scrub_free_csums(sctx);
Liu Bo625f1c8d2013-04-27 02:56:57 +00002493 if (extent_logical + extent_len <
2494 key.objectid + bytes) {
2495 logical += increment;
2496 physical += map->stripe_len;
2497
2498 if (logical < key.objectid + bytes) {
2499 cond_resched();
2500 goto again;
2501 }
2502
2503 if (logical >= logic_end) {
2504 stop_loop = 1;
2505 break;
2506 }
2507 }
Arne Jansena2de7332011-03-08 14:14:00 +01002508next:
2509 path->slots[0]++;
2510 }
Chris Mason71267332011-05-23 06:30:52 -04002511 btrfs_release_path(path);
Arne Jansena2de7332011-03-08 14:14:00 +01002512 logical += increment;
2513 physical += map->stripe_len;
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002514 spin_lock(&sctx->stat_lock);
Liu Bo625f1c8d2013-04-27 02:56:57 +00002515 if (stop_loop)
2516 sctx->stat.last_physical = map->stripes[num].physical +
2517 length;
2518 else
2519 sctx->stat.last_physical = physical;
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002520 spin_unlock(&sctx->stat_lock);
Liu Bo625f1c8d2013-04-27 02:56:57 +00002521 if (stop_loop)
2522 break;
Arne Jansena2de7332011-03-08 14:14:00 +01002523 }
Stefan Behrensff023aa2012-11-06 11:43:11 +01002524out:
Arne Jansena2de7332011-03-08 14:14:00 +01002525 /* push queued extents */
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002526 scrub_submit(sctx);
Stefan Behrensff023aa2012-11-06 11:43:11 +01002527 mutex_lock(&sctx->wr_ctx.wr_lock);
2528 scrub_wr_submit(sctx);
2529 mutex_unlock(&sctx->wr_ctx.wr_lock);
Arne Jansena2de7332011-03-08 14:14:00 +01002530
Arne Jansene7786c32011-05-28 20:58:38 +00002531 blk_finish_plug(&plug);
Arne Jansena2de7332011-03-08 14:14:00 +01002532 btrfs_free_path(path);
2533 return ret < 0 ? ret : 0;
2534}
2535
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002536static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx,
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002537 struct btrfs_device *scrub_dev,
2538 u64 chunk_tree, u64 chunk_objectid,
2539 u64 chunk_offset, u64 length,
Stefan Behrensff023aa2012-11-06 11:43:11 +01002540 u64 dev_offset, int is_dev_replace)
Arne Jansena2de7332011-03-08 14:14:00 +01002541{
2542 struct btrfs_mapping_tree *map_tree =
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002543 &sctx->dev_root->fs_info->mapping_tree;
Arne Jansena2de7332011-03-08 14:14:00 +01002544 struct map_lookup *map;
2545 struct extent_map *em;
2546 int i;
Stefan Behrensff023aa2012-11-06 11:43:11 +01002547 int ret = 0;
Arne Jansena2de7332011-03-08 14:14:00 +01002548
2549 read_lock(&map_tree->map_tree.lock);
2550 em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1);
2551 read_unlock(&map_tree->map_tree.lock);
2552
2553 if (!em)
2554 return -EINVAL;
2555
2556 map = (struct map_lookup *)em->bdev;
2557 if (em->start != chunk_offset)
2558 goto out;
2559
2560 if (em->len < length)
2561 goto out;
2562
2563 for (i = 0; i < map->num_stripes; ++i) {
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002564 if (map->stripes[i].dev->bdev == scrub_dev->bdev &&
Arne Jansen859acaf2012-02-09 15:09:02 +01002565 map->stripes[i].physical == dev_offset) {
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002566 ret = scrub_stripe(sctx, map, scrub_dev, i,
Stefan Behrensff023aa2012-11-06 11:43:11 +01002567 chunk_offset, length,
2568 is_dev_replace);
Arne Jansena2de7332011-03-08 14:14:00 +01002569 if (ret)
2570 goto out;
2571 }
2572 }
2573out:
2574 free_extent_map(em);
2575
2576 return ret;
2577}
2578
2579static noinline_for_stack
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002580int scrub_enumerate_chunks(struct scrub_ctx *sctx,
Stefan Behrensff023aa2012-11-06 11:43:11 +01002581 struct btrfs_device *scrub_dev, u64 start, u64 end,
2582 int is_dev_replace)
Arne Jansena2de7332011-03-08 14:14:00 +01002583{
2584 struct btrfs_dev_extent *dev_extent = NULL;
2585 struct btrfs_path *path;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002586 struct btrfs_root *root = sctx->dev_root;
Arne Jansena2de7332011-03-08 14:14:00 +01002587 struct btrfs_fs_info *fs_info = root->fs_info;
2588 u64 length;
2589 u64 chunk_tree;
2590 u64 chunk_objectid;
2591 u64 chunk_offset;
2592 int ret;
2593 int slot;
2594 struct extent_buffer *l;
2595 struct btrfs_key key;
2596 struct btrfs_key found_key;
2597 struct btrfs_block_group_cache *cache;
Stefan Behrensff023aa2012-11-06 11:43:11 +01002598 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
Arne Jansena2de7332011-03-08 14:14:00 +01002599
2600 path = btrfs_alloc_path();
2601 if (!path)
2602 return -ENOMEM;
2603
2604 path->reada = 2;
2605 path->search_commit_root = 1;
2606 path->skip_locking = 1;
2607
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002608 key.objectid = scrub_dev->devid;
Arne Jansena2de7332011-03-08 14:14:00 +01002609 key.offset = 0ull;
2610 key.type = BTRFS_DEV_EXTENT_KEY;
2611
Arne Jansena2de7332011-03-08 14:14:00 +01002612 while (1) {
2613 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2614 if (ret < 0)
Arne Jansen8c510322011-06-03 10:09:26 +02002615 break;
2616 if (ret > 0) {
2617 if (path->slots[0] >=
2618 btrfs_header_nritems(path->nodes[0])) {
2619 ret = btrfs_next_leaf(root, path);
2620 if (ret)
2621 break;
2622 }
2623 }
Arne Jansena2de7332011-03-08 14:14:00 +01002624
2625 l = path->nodes[0];
2626 slot = path->slots[0];
2627
2628 btrfs_item_key_to_cpu(l, &found_key, slot);
2629
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002630 if (found_key.objectid != scrub_dev->devid)
Arne Jansena2de7332011-03-08 14:14:00 +01002631 break;
2632
Arne Jansen8c510322011-06-03 10:09:26 +02002633 if (btrfs_key_type(&found_key) != BTRFS_DEV_EXTENT_KEY)
Arne Jansena2de7332011-03-08 14:14:00 +01002634 break;
2635
2636 if (found_key.offset >= end)
2637 break;
2638
2639 if (found_key.offset < key.offset)
2640 break;
2641
2642 dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent);
2643 length = btrfs_dev_extent_length(l, dev_extent);
2644
2645 if (found_key.offset + length <= start) {
2646 key.offset = found_key.offset + length;
Chris Mason71267332011-05-23 06:30:52 -04002647 btrfs_release_path(path);
Arne Jansena2de7332011-03-08 14:14:00 +01002648 continue;
2649 }
2650
2651 chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent);
2652 chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent);
2653 chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent);
2654
2655 /*
2656 * get a reference on the corresponding block group to prevent
2657 * the chunk from going away while we scrub it
2658 */
2659 cache = btrfs_lookup_block_group(fs_info, chunk_offset);
2660 if (!cache) {
2661 ret = -ENOENT;
Arne Jansen8c510322011-06-03 10:09:26 +02002662 break;
Arne Jansena2de7332011-03-08 14:14:00 +01002663 }
Stefan Behrensff023aa2012-11-06 11:43:11 +01002664 dev_replace->cursor_right = found_key.offset + length;
2665 dev_replace->cursor_left = found_key.offset;
2666 dev_replace->item_needs_writeback = 1;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002667 ret = scrub_chunk(sctx, scrub_dev, chunk_tree, chunk_objectid,
Stefan Behrensff023aa2012-11-06 11:43:11 +01002668 chunk_offset, length, found_key.offset,
2669 is_dev_replace);
2670
2671 /*
2672 * flush, submit all pending read and write bios, afterwards
2673 * wait for them.
2674 * Note that in the dev replace case, a read request causes
2675 * write requests that are submitted in the read completion
2676 * worker. Therefore in the current situation, it is required
2677 * that all write requests are flushed, so that all read and
2678 * write requests are really completed when bios_in_flight
2679 * changes to 0.
2680 */
2681 atomic_set(&sctx->wr_ctx.flush_all_writes, 1);
2682 scrub_submit(sctx);
2683 mutex_lock(&sctx->wr_ctx.wr_lock);
2684 scrub_wr_submit(sctx);
2685 mutex_unlock(&sctx->wr_ctx.wr_lock);
2686
2687 wait_event(sctx->list_wait,
2688 atomic_read(&sctx->bios_in_flight) == 0);
2689 atomic_set(&sctx->wr_ctx.flush_all_writes, 0);
Stefan Behrensff023aa2012-11-06 11:43:11 +01002690 wait_event(sctx->list_wait,
2691 atomic_read(&sctx->workers_pending) == 0);
Wang Shilong3cb09292013-12-04 21:15:19 +08002692 scrub_blocked_if_needed(fs_info);
Stefan Behrensff023aa2012-11-06 11:43:11 +01002693
Arne Jansena2de7332011-03-08 14:14:00 +01002694 btrfs_put_block_group(cache);
2695 if (ret)
2696 break;
Stefan Behrensaf1be4f2012-11-27 17:39:51 +00002697 if (is_dev_replace &&
2698 atomic64_read(&dev_replace->num_write_errors) > 0) {
Stefan Behrensff023aa2012-11-06 11:43:11 +01002699 ret = -EIO;
2700 break;
2701 }
2702 if (sctx->stat.malloc_errors > 0) {
2703 ret = -ENOMEM;
2704 break;
2705 }
Arne Jansena2de7332011-03-08 14:14:00 +01002706
Ilya Dryomov539f3582013-10-07 13:42:57 +03002707 dev_replace->cursor_left = dev_replace->cursor_right;
2708 dev_replace->item_needs_writeback = 1;
2709
Arne Jansena2de7332011-03-08 14:14:00 +01002710 key.offset = found_key.offset + length;
Chris Mason71267332011-05-23 06:30:52 -04002711 btrfs_release_path(path);
Arne Jansena2de7332011-03-08 14:14:00 +01002712 }
2713
Arne Jansena2de7332011-03-08 14:14:00 +01002714 btrfs_free_path(path);
Arne Jansen8c510322011-06-03 10:09:26 +02002715
2716 /*
2717 * ret can still be 1 from search_slot or next_leaf,
2718 * that's not an error
2719 */
2720 return ret < 0 ? ret : 0;
Arne Jansena2de7332011-03-08 14:14:00 +01002721}
2722
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002723static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx,
2724 struct btrfs_device *scrub_dev)
Arne Jansena2de7332011-03-08 14:14:00 +01002725{
2726 int i;
2727 u64 bytenr;
2728 u64 gen;
2729 int ret;
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002730 struct btrfs_root *root = sctx->dev_root;
Arne Jansena2de7332011-03-08 14:14:00 +01002731
Miao Xie87533c42013-01-29 10:14:48 +00002732 if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state))
Jeff Mahoney79787ea2012-03-12 16:03:00 +01002733 return -EIO;
2734
Arne Jansena2de7332011-03-08 14:14:00 +01002735 gen = root->fs_info->last_trans_committed;
2736
2737 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
2738 bytenr = btrfs_sb_offset(i);
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002739 if (bytenr + BTRFS_SUPER_INFO_SIZE > scrub_dev->total_bytes)
Arne Jansena2de7332011-03-08 14:14:00 +01002740 break;
2741
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002742 ret = scrub_pages(sctx, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr,
Stefan Behrensa36cf8b2012-11-02 13:26:57 +01002743 scrub_dev, BTRFS_EXTENT_FLAG_SUPER, gen, i,
Stefan Behrensff023aa2012-11-06 11:43:11 +01002744 NULL, 1, bytenr);
Arne Jansena2de7332011-03-08 14:14:00 +01002745 if (ret)
2746 return ret;
2747 }
Stefan Behrensb6bfebc2012-11-02 16:44:58 +01002748 wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0);
Arne Jansena2de7332011-03-08 14:14:00 +01002749
2750 return 0;
2751}
2752
2753/*
2754 * get a reference count on fs_info->scrub_workers. start worker if necessary
2755 */
Stefan Behrensff023aa2012-11-06 11:43:11 +01002756static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info,
2757 int is_dev_replace)
Arne Jansena2de7332011-03-08 14:14:00 +01002758{
Josef Bacik0dc3b842011-11-18 14:37:27 -05002759 int ret = 0;
Arne Jansena2de7332011-03-08 14:14:00 +01002760
Arne Jansen632dd772011-06-10 12:07:07 +02002761 if (fs_info->scrub_workers_refcnt == 0) {
Stefan Behrensff023aa2012-11-06 11:43:11 +01002762 if (is_dev_replace)
2763 btrfs_init_workers(&fs_info->scrub_workers, "scrub", 1,
2764 &fs_info->generic_worker);
2765 else
2766 btrfs_init_workers(&fs_info->scrub_workers, "scrub",
2767 fs_info->thread_pool_size,
2768 &fs_info->generic_worker);
Arne Jansen632dd772011-06-10 12:07:07 +02002769 fs_info->scrub_workers.idle_thresh = 4;
Josef Bacik0dc3b842011-11-18 14:37:27 -05002770 ret = btrfs_start_workers(&fs_info->scrub_workers);
2771 if (ret)
2772 goto out;
Stefan Behrensff023aa2012-11-06 11:43:11 +01002773 btrfs_init_workers(&fs_info->scrub_wr_completion_workers,
2774 "scrubwrc",
2775 fs_info->thread_pool_size,
2776 &fs_info->generic_worker);
2777 fs_info->scrub_wr_completion_workers.idle_thresh = 2;
2778 ret = btrfs_start_workers(
2779 &fs_info->scrub_wr_completion_workers);
2780 if (ret)
2781 goto out;
2782 btrfs_init_workers(&fs_info->scrub_nocow_workers, "scrubnc", 1,
2783 &fs_info->generic_worker);
2784 ret = btrfs_start_workers(&fs_info->scrub_nocow_workers);
2785 if (ret)
2786 goto out;
Arne Jansen632dd772011-06-10 12:07:07 +02002787 }
Arne Jansena2de7332011-03-08 14:14:00 +01002788 ++fs_info->scrub_workers_refcnt;
Josef Bacik0dc3b842011-11-18 14:37:27 -05002789out:
Josef Bacik0dc3b842011-11-18 14:37:27 -05002790 return ret;
Arne Jansena2de7332011-03-08 14:14:00 +01002791}
2792
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01002793static noinline_for_stack void scrub_workers_put(struct btrfs_fs_info *fs_info)
Arne Jansena2de7332011-03-08 14:14:00 +01002794{
Stefan Behrensff023aa2012-11-06 11:43:11 +01002795 if (--fs_info->scrub_workers_refcnt == 0) {
Arne Jansena2de7332011-03-08 14:14:00 +01002796 btrfs_stop_workers(&fs_info->scrub_workers);
Stefan Behrensff023aa2012-11-06 11:43:11 +01002797 btrfs_stop_workers(&fs_info->scrub_wr_completion_workers);
2798 btrfs_stop_workers(&fs_info->scrub_nocow_workers);
2799 }
Arne Jansena2de7332011-03-08 14:14:00 +01002800 WARN_ON(fs_info->scrub_workers_refcnt < 0);
Arne Jansena2de7332011-03-08 14:14:00 +01002801}
2802
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01002803int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
2804 u64 end, struct btrfs_scrub_progress *progress,
Stefan Behrens63a212a2012-11-05 18:29:28 +01002805 int readonly, int is_dev_replace)
Arne Jansena2de7332011-03-08 14:14:00 +01002806{
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002807 struct scrub_ctx *sctx;
Arne Jansena2de7332011-03-08 14:14:00 +01002808 int ret;
2809 struct btrfs_device *dev;
2810
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01002811 if (btrfs_fs_closing(fs_info))
Arne Jansena2de7332011-03-08 14:14:00 +01002812 return -EINVAL;
2813
2814 /*
2815 * check some assumptions
2816 */
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01002817 if (fs_info->chunk_root->nodesize != fs_info->chunk_root->leafsize) {
Frank Holtonefe120a2013-12-20 11:37:06 -05002818 btrfs_err(fs_info,
2819 "scrub: size assumption nodesize == leafsize (%d == %d) fails",
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01002820 fs_info->chunk_root->nodesize,
2821 fs_info->chunk_root->leafsize);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002822 return -EINVAL;
2823 }
2824
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01002825 if (fs_info->chunk_root->nodesize > BTRFS_STRIPE_LEN) {
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002826 /*
2827 * in this case scrub is unable to calculate the checksum
2828 * the way scrub is implemented. Do not handle this
2829 * situation at all because it won't ever happen.
2830 */
Frank Holtonefe120a2013-12-20 11:37:06 -05002831 btrfs_err(fs_info,
2832 "scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails",
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01002833 fs_info->chunk_root->nodesize, BTRFS_STRIPE_LEN);
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002834 return -EINVAL;
2835 }
2836
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01002837 if (fs_info->chunk_root->sectorsize != PAGE_SIZE) {
Stefan Behrensb5d67f62012-03-27 14:21:27 -04002838 /* not supported for data w/o checksums */
Frank Holtonefe120a2013-12-20 11:37:06 -05002839 btrfs_err(fs_info,
2840 "scrub: size assumption sectorsize != PAGE_SIZE "
2841 "(%d != %lu) fails",
Geert Uytterhoeven27f9f022013-08-20 13:20:09 +02002842 fs_info->chunk_root->sectorsize, PAGE_SIZE);
Arne Jansena2de7332011-03-08 14:14:00 +01002843 return -EINVAL;
2844 }
2845
Stefan Behrens7a9e9982012-11-02 14:58:04 +01002846 if (fs_info->chunk_root->nodesize >
2847 PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK ||
2848 fs_info->chunk_root->sectorsize >
2849 PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK) {
2850 /*
2851 * would exhaust the array bounds of pagev member in
2852 * struct scrub_block
2853 */
Frank Holtonefe120a2013-12-20 11:37:06 -05002854 btrfs_err(fs_info, "scrub: size assumption nodesize and sectorsize "
2855 "<= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails",
Stefan Behrens7a9e9982012-11-02 14:58:04 +01002856 fs_info->chunk_root->nodesize,
2857 SCRUB_MAX_PAGES_PER_BLOCK,
2858 fs_info->chunk_root->sectorsize,
2859 SCRUB_MAX_PAGES_PER_BLOCK);
2860 return -EINVAL;
2861 }
2862
Arne Jansena2de7332011-03-08 14:14:00 +01002863
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01002864 mutex_lock(&fs_info->fs_devices->device_list_mutex);
2865 dev = btrfs_find_device(fs_info, devid, NULL, NULL);
Stefan Behrens63a212a2012-11-05 18:29:28 +01002866 if (!dev || (dev->missing && !is_dev_replace)) {
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01002867 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
Arne Jansena2de7332011-03-08 14:14:00 +01002868 return -ENODEV;
2869 }
Arne Jansena2de7332011-03-08 14:14:00 +01002870
Wang Shilong3b7a0162013-10-12 02:11:12 +08002871 mutex_lock(&fs_info->scrub_lock);
Stefan Behrens63a212a2012-11-05 18:29:28 +01002872 if (!dev->in_fs_metadata || dev->is_tgtdev_for_dev_replace) {
Arne Jansena2de7332011-03-08 14:14:00 +01002873 mutex_unlock(&fs_info->scrub_lock);
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01002874 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01002875 return -EIO;
Arne Jansena2de7332011-03-08 14:14:00 +01002876 }
2877
Stefan Behrens8dabb742012-11-06 13:15:27 +01002878 btrfs_dev_replace_lock(&fs_info->dev_replace);
2879 if (dev->scrub_device ||
2880 (!is_dev_replace &&
2881 btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) {
2882 btrfs_dev_replace_unlock(&fs_info->dev_replace);
Arne Jansena2de7332011-03-08 14:14:00 +01002883 mutex_unlock(&fs_info->scrub_lock);
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01002884 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
Arne Jansena2de7332011-03-08 14:14:00 +01002885 return -EINPROGRESS;
2886 }
Stefan Behrens8dabb742012-11-06 13:15:27 +01002887 btrfs_dev_replace_unlock(&fs_info->dev_replace);
Wang Shilong3b7a0162013-10-12 02:11:12 +08002888
2889 ret = scrub_workers_get(fs_info, is_dev_replace);
2890 if (ret) {
2891 mutex_unlock(&fs_info->scrub_lock);
2892 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
2893 return ret;
2894 }
2895
Stefan Behrens63a212a2012-11-05 18:29:28 +01002896 sctx = scrub_setup_ctx(dev, is_dev_replace);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002897 if (IS_ERR(sctx)) {
Arne Jansena2de7332011-03-08 14:14:00 +01002898 mutex_unlock(&fs_info->scrub_lock);
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01002899 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
2900 scrub_workers_put(fs_info);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002901 return PTR_ERR(sctx);
Arne Jansena2de7332011-03-08 14:14:00 +01002902 }
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002903 sctx->readonly = readonly;
2904 dev->scrub_device = sctx;
Wang Shilong3cb09292013-12-04 21:15:19 +08002905 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
Arne Jansena2de7332011-03-08 14:14:00 +01002906
Wang Shilong3cb09292013-12-04 21:15:19 +08002907 /*
2908 * checking @scrub_pause_req here, we can avoid
2909 * race between committing transaction and scrubbing.
2910 */
Wang Shilongcb7ab022013-12-04 21:16:53 +08002911 __scrub_blocked_if_needed(fs_info);
Arne Jansena2de7332011-03-08 14:14:00 +01002912 atomic_inc(&fs_info->scrubs_running);
2913 mutex_unlock(&fs_info->scrub_lock);
Arne Jansena2de7332011-03-08 14:14:00 +01002914
Stefan Behrensff023aa2012-11-06 11:43:11 +01002915 if (!is_dev_replace) {
Wang Shilong9b011ad2013-10-25 19:12:02 +08002916 /*
2917 * by holding device list mutex, we can
2918 * kick off writing super in log tree sync.
2919 */
Wang Shilong3cb09292013-12-04 21:15:19 +08002920 mutex_lock(&fs_info->fs_devices->device_list_mutex);
Stefan Behrensff023aa2012-11-06 11:43:11 +01002921 ret = scrub_supers(sctx, dev);
Wang Shilong3cb09292013-12-04 21:15:19 +08002922 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
Stefan Behrensff023aa2012-11-06 11:43:11 +01002923 }
Arne Jansena2de7332011-03-08 14:14:00 +01002924
2925 if (!ret)
Stefan Behrensff023aa2012-11-06 11:43:11 +01002926 ret = scrub_enumerate_chunks(sctx, dev, start, end,
2927 is_dev_replace);
Arne Jansena2de7332011-03-08 14:14:00 +01002928
Stefan Behrensb6bfebc2012-11-02 16:44:58 +01002929 wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0);
Arne Jansena2de7332011-03-08 14:14:00 +01002930 atomic_dec(&fs_info->scrubs_running);
2931 wake_up(&fs_info->scrub_pause_wait);
2932
Stefan Behrensb6bfebc2012-11-02 16:44:58 +01002933 wait_event(sctx->list_wait, atomic_read(&sctx->workers_pending) == 0);
Jan Schmidt0ef8e452011-06-13 20:04:15 +02002934
Arne Jansena2de7332011-03-08 14:14:00 +01002935 if (progress)
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002936 memcpy(progress, &sctx->stat, sizeof(*progress));
Arne Jansena2de7332011-03-08 14:14:00 +01002937
2938 mutex_lock(&fs_info->scrub_lock);
2939 dev->scrub_device = NULL;
Wang Shilong3b7a0162013-10-12 02:11:12 +08002940 scrub_workers_put(fs_info);
Arne Jansena2de7332011-03-08 14:14:00 +01002941 mutex_unlock(&fs_info->scrub_lock);
2942
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002943 scrub_free_ctx(sctx);
Arne Jansena2de7332011-03-08 14:14:00 +01002944
2945 return ret;
2946}
2947
Jeff Mahoney143bede2012-03-01 14:56:26 +01002948void btrfs_scrub_pause(struct btrfs_root *root)
Arne Jansena2de7332011-03-08 14:14:00 +01002949{
2950 struct btrfs_fs_info *fs_info = root->fs_info;
2951
2952 mutex_lock(&fs_info->scrub_lock);
2953 atomic_inc(&fs_info->scrub_pause_req);
2954 while (atomic_read(&fs_info->scrubs_paused) !=
2955 atomic_read(&fs_info->scrubs_running)) {
2956 mutex_unlock(&fs_info->scrub_lock);
2957 wait_event(fs_info->scrub_pause_wait,
2958 atomic_read(&fs_info->scrubs_paused) ==
2959 atomic_read(&fs_info->scrubs_running));
2960 mutex_lock(&fs_info->scrub_lock);
2961 }
2962 mutex_unlock(&fs_info->scrub_lock);
Arne Jansena2de7332011-03-08 14:14:00 +01002963}
2964
Jeff Mahoney143bede2012-03-01 14:56:26 +01002965void btrfs_scrub_continue(struct btrfs_root *root)
Arne Jansena2de7332011-03-08 14:14:00 +01002966{
2967 struct btrfs_fs_info *fs_info = root->fs_info;
2968
2969 atomic_dec(&fs_info->scrub_pause_req);
2970 wake_up(&fs_info->scrub_pause_wait);
Arne Jansena2de7332011-03-08 14:14:00 +01002971}
2972
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01002973int btrfs_scrub_cancel(struct btrfs_fs_info *fs_info)
Arne Jansena2de7332011-03-08 14:14:00 +01002974{
Arne Jansena2de7332011-03-08 14:14:00 +01002975 mutex_lock(&fs_info->scrub_lock);
2976 if (!atomic_read(&fs_info->scrubs_running)) {
2977 mutex_unlock(&fs_info->scrub_lock);
2978 return -ENOTCONN;
2979 }
2980
2981 atomic_inc(&fs_info->scrub_cancel_req);
2982 while (atomic_read(&fs_info->scrubs_running)) {
2983 mutex_unlock(&fs_info->scrub_lock);
2984 wait_event(fs_info->scrub_pause_wait,
2985 atomic_read(&fs_info->scrubs_running) == 0);
2986 mutex_lock(&fs_info->scrub_lock);
2987 }
2988 atomic_dec(&fs_info->scrub_cancel_req);
2989 mutex_unlock(&fs_info->scrub_lock);
2990
2991 return 0;
2992}
2993
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01002994int btrfs_scrub_cancel_dev(struct btrfs_fs_info *fs_info,
2995 struct btrfs_device *dev)
Jeff Mahoney49b25e02012-03-01 17:24:58 +01002996{
Stefan Behrensd9d181c2012-11-02 09:58:09 +01002997 struct scrub_ctx *sctx;
Arne Jansena2de7332011-03-08 14:14:00 +01002998
2999 mutex_lock(&fs_info->scrub_lock);
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003000 sctx = dev->scrub_device;
3001 if (!sctx) {
Arne Jansena2de7332011-03-08 14:14:00 +01003002 mutex_unlock(&fs_info->scrub_lock);
3003 return -ENOTCONN;
3004 }
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003005 atomic_inc(&sctx->cancel_req);
Arne Jansena2de7332011-03-08 14:14:00 +01003006 while (dev->scrub_device) {
3007 mutex_unlock(&fs_info->scrub_lock);
3008 wait_event(fs_info->scrub_pause_wait,
3009 dev->scrub_device == NULL);
3010 mutex_lock(&fs_info->scrub_lock);
3011 }
3012 mutex_unlock(&fs_info->scrub_lock);
3013
3014 return 0;
3015}
Stefan Behrens1623ede2012-03-27 14:21:26 -04003016
Arne Jansena2de7332011-03-08 14:14:00 +01003017int btrfs_scrub_progress(struct btrfs_root *root, u64 devid,
3018 struct btrfs_scrub_progress *progress)
3019{
3020 struct btrfs_device *dev;
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003021 struct scrub_ctx *sctx = NULL;
Arne Jansena2de7332011-03-08 14:14:00 +01003022
3023 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01003024 dev = btrfs_find_device(root->fs_info, devid, NULL, NULL);
Arne Jansena2de7332011-03-08 14:14:00 +01003025 if (dev)
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003026 sctx = dev->scrub_device;
3027 if (sctx)
3028 memcpy(progress, &sctx->stat, sizeof(*progress));
Arne Jansena2de7332011-03-08 14:14:00 +01003029 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
3030
Stefan Behrensd9d181c2012-11-02 09:58:09 +01003031 return dev ? (sctx ? 0 : -ENOTCONN) : -ENODEV;
Arne Jansena2de7332011-03-08 14:14:00 +01003032}
Stefan Behrensff023aa2012-11-06 11:43:11 +01003033
3034static void scrub_remap_extent(struct btrfs_fs_info *fs_info,
3035 u64 extent_logical, u64 extent_len,
3036 u64 *extent_physical,
3037 struct btrfs_device **extent_dev,
3038 int *extent_mirror_num)
3039{
3040 u64 mapped_length;
3041 struct btrfs_bio *bbio = NULL;
3042 int ret;
3043
3044 mapped_length = extent_len;
3045 ret = btrfs_map_block(fs_info, READ, extent_logical,
3046 &mapped_length, &bbio, 0);
3047 if (ret || !bbio || mapped_length < extent_len ||
3048 !bbio->stripes[0].dev->bdev) {
3049 kfree(bbio);
3050 return;
3051 }
3052
3053 *extent_physical = bbio->stripes[0].physical;
3054 *extent_mirror_num = bbio->mirror_num;
3055 *extent_dev = bbio->stripes[0].dev;
3056 kfree(bbio);
3057}
3058
3059static int scrub_setup_wr_ctx(struct scrub_ctx *sctx,
3060 struct scrub_wr_ctx *wr_ctx,
3061 struct btrfs_fs_info *fs_info,
3062 struct btrfs_device *dev,
3063 int is_dev_replace)
3064{
3065 WARN_ON(wr_ctx->wr_curr_bio != NULL);
3066
3067 mutex_init(&wr_ctx->wr_lock);
3068 wr_ctx->wr_curr_bio = NULL;
3069 if (!is_dev_replace)
3070 return 0;
3071
3072 WARN_ON(!dev->bdev);
3073 wr_ctx->pages_per_wr_bio = min_t(int, SCRUB_PAGES_PER_WR_BIO,
3074 bio_get_nr_vecs(dev->bdev));
3075 wr_ctx->tgtdev = dev;
3076 atomic_set(&wr_ctx->flush_all_writes, 0);
3077 return 0;
3078}
3079
3080static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx)
3081{
3082 mutex_lock(&wr_ctx->wr_lock);
3083 kfree(wr_ctx->wr_curr_bio);
3084 wr_ctx->wr_curr_bio = NULL;
3085 mutex_unlock(&wr_ctx->wr_lock);
3086}
3087
3088static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
3089 int mirror_num, u64 physical_for_dev_replace)
3090{
3091 struct scrub_copy_nocow_ctx *nocow_ctx;
3092 struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
3093
3094 nocow_ctx = kzalloc(sizeof(*nocow_ctx), GFP_NOFS);
3095 if (!nocow_ctx) {
3096 spin_lock(&sctx->stat_lock);
3097 sctx->stat.malloc_errors++;
3098 spin_unlock(&sctx->stat_lock);
3099 return -ENOMEM;
3100 }
3101
3102 scrub_pending_trans_workers_inc(sctx);
3103
3104 nocow_ctx->sctx = sctx;
3105 nocow_ctx->logical = logical;
3106 nocow_ctx->len = len;
3107 nocow_ctx->mirror_num = mirror_num;
3108 nocow_ctx->physical_for_dev_replace = physical_for_dev_replace;
3109 nocow_ctx->work.func = copy_nocow_pages_worker;
Josef Bacik652f25a2013-09-12 16:58:28 -04003110 INIT_LIST_HEAD(&nocow_ctx->inodes);
Stefan Behrensff023aa2012-11-06 11:43:11 +01003111 btrfs_queue_worker(&fs_info->scrub_nocow_workers,
3112 &nocow_ctx->work);
3113
3114 return 0;
3115}
3116
Josef Bacik652f25a2013-09-12 16:58:28 -04003117static int record_inode_for_nocow(u64 inum, u64 offset, u64 root, void *ctx)
3118{
3119 struct scrub_copy_nocow_ctx *nocow_ctx = ctx;
3120 struct scrub_nocow_inode *nocow_inode;
3121
3122 nocow_inode = kzalloc(sizeof(*nocow_inode), GFP_NOFS);
3123 if (!nocow_inode)
3124 return -ENOMEM;
3125 nocow_inode->inum = inum;
3126 nocow_inode->offset = offset;
3127 nocow_inode->root = root;
3128 list_add_tail(&nocow_inode->list, &nocow_ctx->inodes);
3129 return 0;
3130}
3131
3132#define COPY_COMPLETE 1
3133
Stefan Behrensff023aa2012-11-06 11:43:11 +01003134static void copy_nocow_pages_worker(struct btrfs_work *work)
3135{
3136 struct scrub_copy_nocow_ctx *nocow_ctx =
3137 container_of(work, struct scrub_copy_nocow_ctx, work);
3138 struct scrub_ctx *sctx = nocow_ctx->sctx;
3139 u64 logical = nocow_ctx->logical;
3140 u64 len = nocow_ctx->len;
3141 int mirror_num = nocow_ctx->mirror_num;
3142 u64 physical_for_dev_replace = nocow_ctx->physical_for_dev_replace;
3143 int ret;
3144 struct btrfs_trans_handle *trans = NULL;
3145 struct btrfs_fs_info *fs_info;
3146 struct btrfs_path *path;
3147 struct btrfs_root *root;
3148 int not_written = 0;
3149
3150 fs_info = sctx->dev_root->fs_info;
3151 root = fs_info->extent_root;
3152
3153 path = btrfs_alloc_path();
3154 if (!path) {
3155 spin_lock(&sctx->stat_lock);
3156 sctx->stat.malloc_errors++;
3157 spin_unlock(&sctx->stat_lock);
3158 not_written = 1;
3159 goto out;
3160 }
3161
3162 trans = btrfs_join_transaction(root);
3163 if (IS_ERR(trans)) {
3164 not_written = 1;
3165 goto out;
3166 }
3167
3168 ret = iterate_inodes_from_logical(logical, fs_info, path,
Josef Bacik652f25a2013-09-12 16:58:28 -04003169 record_inode_for_nocow, nocow_ctx);
Stefan Behrensff023aa2012-11-06 11:43:11 +01003170 if (ret != 0 && ret != -ENOENT) {
Frank Holtonefe120a2013-12-20 11:37:06 -05003171 btrfs_warn(fs_info, "iterate_inodes_from_logical() failed: log %llu, "
3172 "phys %llu, len %llu, mir %u, ret %d",
Geert Uytterhoeven118a0a22013-08-20 13:20:10 +02003173 logical, physical_for_dev_replace, len, mirror_num,
3174 ret);
Stefan Behrensff023aa2012-11-06 11:43:11 +01003175 not_written = 1;
3176 goto out;
3177 }
3178
Josef Bacik652f25a2013-09-12 16:58:28 -04003179 btrfs_end_transaction(trans, root);
3180 trans = NULL;
3181 while (!list_empty(&nocow_ctx->inodes)) {
3182 struct scrub_nocow_inode *entry;
3183 entry = list_first_entry(&nocow_ctx->inodes,
3184 struct scrub_nocow_inode,
3185 list);
3186 list_del_init(&entry->list);
3187 ret = copy_nocow_pages_for_inode(entry->inum, entry->offset,
3188 entry->root, nocow_ctx);
3189 kfree(entry);
3190 if (ret == COPY_COMPLETE) {
3191 ret = 0;
3192 break;
3193 } else if (ret) {
3194 break;
3195 }
3196 }
Stefan Behrensff023aa2012-11-06 11:43:11 +01003197out:
Josef Bacik652f25a2013-09-12 16:58:28 -04003198 while (!list_empty(&nocow_ctx->inodes)) {
3199 struct scrub_nocow_inode *entry;
3200 entry = list_first_entry(&nocow_ctx->inodes,
3201 struct scrub_nocow_inode,
3202 list);
3203 list_del_init(&entry->list);
3204 kfree(entry);
3205 }
Stefan Behrensff023aa2012-11-06 11:43:11 +01003206 if (trans && !IS_ERR(trans))
3207 btrfs_end_transaction(trans, root);
3208 if (not_written)
3209 btrfs_dev_replace_stats_inc(&fs_info->dev_replace.
3210 num_uncorrectable_read_errors);
3211
3212 btrfs_free_path(path);
3213 kfree(nocow_ctx);
3214
3215 scrub_pending_trans_workers_dec(sctx);
3216}
3217
Josef Bacik652f25a2013-09-12 16:58:28 -04003218static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root,
3219 struct scrub_copy_nocow_ctx *nocow_ctx)
Stefan Behrensff023aa2012-11-06 11:43:11 +01003220{
Miao Xie826aa0a2013-06-27 18:50:59 +08003221 struct btrfs_fs_info *fs_info = nocow_ctx->sctx->dev_root->fs_info;
Stefan Behrensff023aa2012-11-06 11:43:11 +01003222 struct btrfs_key key;
Miao Xie826aa0a2013-06-27 18:50:59 +08003223 struct inode *inode;
3224 struct page *page;
Stefan Behrensff023aa2012-11-06 11:43:11 +01003225 struct btrfs_root *local_root;
Josef Bacik652f25a2013-09-12 16:58:28 -04003226 struct btrfs_ordered_extent *ordered;
3227 struct extent_map *em;
3228 struct extent_state *cached_state = NULL;
3229 struct extent_io_tree *io_tree;
Stefan Behrensff023aa2012-11-06 11:43:11 +01003230 u64 physical_for_dev_replace;
Josef Bacik652f25a2013-09-12 16:58:28 -04003231 u64 len = nocow_ctx->len;
3232 u64 lockstart = offset, lockend = offset + len - 1;
Miao Xie826aa0a2013-06-27 18:50:59 +08003233 unsigned long index;
Liu Bo6f1c3602013-01-29 03:22:10 +00003234 int srcu_index;
Josef Bacik652f25a2013-09-12 16:58:28 -04003235 int ret = 0;
3236 int err = 0;
Stefan Behrensff023aa2012-11-06 11:43:11 +01003237
3238 key.objectid = root;
3239 key.type = BTRFS_ROOT_ITEM_KEY;
3240 key.offset = (u64)-1;
Liu Bo6f1c3602013-01-29 03:22:10 +00003241
3242 srcu_index = srcu_read_lock(&fs_info->subvol_srcu);
3243
Stefan Behrensff023aa2012-11-06 11:43:11 +01003244 local_root = btrfs_read_fs_root_no_name(fs_info, &key);
Liu Bo6f1c3602013-01-29 03:22:10 +00003245 if (IS_ERR(local_root)) {
3246 srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
Stefan Behrensff023aa2012-11-06 11:43:11 +01003247 return PTR_ERR(local_root);
Liu Bo6f1c3602013-01-29 03:22:10 +00003248 }
Stefan Behrensff023aa2012-11-06 11:43:11 +01003249
3250 key.type = BTRFS_INODE_ITEM_KEY;
3251 key.objectid = inum;
3252 key.offset = 0;
3253 inode = btrfs_iget(fs_info->sb, &key, local_root, NULL);
Liu Bo6f1c3602013-01-29 03:22:10 +00003254 srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
Stefan Behrensff023aa2012-11-06 11:43:11 +01003255 if (IS_ERR(inode))
3256 return PTR_ERR(inode);
3257
Miao Xieedd14002013-06-27 18:51:00 +08003258 /* Avoid truncate/dio/punch hole.. */
3259 mutex_lock(&inode->i_mutex);
3260 inode_dio_wait(inode);
3261
Stefan Behrensff023aa2012-11-06 11:43:11 +01003262 physical_for_dev_replace = nocow_ctx->physical_for_dev_replace;
Josef Bacik652f25a2013-09-12 16:58:28 -04003263 io_tree = &BTRFS_I(inode)->io_tree;
3264
3265 lock_extent_bits(io_tree, lockstart, lockend, 0, &cached_state);
3266 ordered = btrfs_lookup_ordered_range(inode, lockstart, len);
3267 if (ordered) {
3268 btrfs_put_ordered_extent(ordered);
3269 goto out_unlock;
3270 }
3271
3272 em = btrfs_get_extent(inode, NULL, 0, lockstart, len, 0);
3273 if (IS_ERR(em)) {
3274 ret = PTR_ERR(em);
3275 goto out_unlock;
3276 }
3277
3278 /*
3279 * This extent does not actually cover the logical extent anymore,
3280 * move on to the next inode.
3281 */
3282 if (em->block_start > nocow_ctx->logical ||
3283 em->block_start + em->block_len < nocow_ctx->logical + len) {
3284 free_extent_map(em);
3285 goto out_unlock;
3286 }
3287 free_extent_map(em);
3288
Stefan Behrensff023aa2012-11-06 11:43:11 +01003289 while (len >= PAGE_CACHE_SIZE) {
Stefan Behrensff023aa2012-11-06 11:43:11 +01003290 index = offset >> PAGE_CACHE_SHIFT;
Miao Xieedd14002013-06-27 18:51:00 +08003291again:
Stefan Behrensff023aa2012-11-06 11:43:11 +01003292 page = find_or_create_page(inode->i_mapping, index, GFP_NOFS);
3293 if (!page) {
Frank Holtonefe120a2013-12-20 11:37:06 -05003294 btrfs_err(fs_info, "find_or_create_page() failed");
Stefan Behrensff023aa2012-11-06 11:43:11 +01003295 ret = -ENOMEM;
Miao Xie826aa0a2013-06-27 18:50:59 +08003296 goto out;
Stefan Behrensff023aa2012-11-06 11:43:11 +01003297 }
3298
3299 if (PageUptodate(page)) {
3300 if (PageDirty(page))
3301 goto next_page;
3302 } else {
3303 ClearPageError(page);
Josef Bacik652f25a2013-09-12 16:58:28 -04003304 err = extent_read_full_page_nolock(io_tree, page,
3305 btrfs_get_extent,
3306 nocow_ctx->mirror_num);
Miao Xie826aa0a2013-06-27 18:50:59 +08003307 if (err) {
3308 ret = err;
Stefan Behrensff023aa2012-11-06 11:43:11 +01003309 goto next_page;
3310 }
Miao Xieedd14002013-06-27 18:51:00 +08003311
Miao Xie26b258912013-06-27 18:50:58 +08003312 lock_page(page);
Miao Xieedd14002013-06-27 18:51:00 +08003313 /*
3314 * If the page has been remove from the page cache,
3315 * the data on it is meaningless, because it may be
3316 * old one, the new data may be written into the new
3317 * page in the page cache.
3318 */
3319 if (page->mapping != inode->i_mapping) {
Josef Bacik652f25a2013-09-12 16:58:28 -04003320 unlock_page(page);
Miao Xieedd14002013-06-27 18:51:00 +08003321 page_cache_release(page);
3322 goto again;
3323 }
Stefan Behrensff023aa2012-11-06 11:43:11 +01003324 if (!PageUptodate(page)) {
3325 ret = -EIO;
3326 goto next_page;
3327 }
3328 }
Miao Xie826aa0a2013-06-27 18:50:59 +08003329 err = write_page_nocow(nocow_ctx->sctx,
3330 physical_for_dev_replace, page);
3331 if (err)
3332 ret = err;
Stefan Behrensff023aa2012-11-06 11:43:11 +01003333next_page:
Miao Xie826aa0a2013-06-27 18:50:59 +08003334 unlock_page(page);
3335 page_cache_release(page);
3336
3337 if (ret)
3338 break;
3339
Stefan Behrensff023aa2012-11-06 11:43:11 +01003340 offset += PAGE_CACHE_SIZE;
3341 physical_for_dev_replace += PAGE_CACHE_SIZE;
3342 len -= PAGE_CACHE_SIZE;
3343 }
Josef Bacik652f25a2013-09-12 16:58:28 -04003344 ret = COPY_COMPLETE;
3345out_unlock:
3346 unlock_extent_cached(io_tree, lockstart, lockend, &cached_state,
3347 GFP_NOFS);
Miao Xie826aa0a2013-06-27 18:50:59 +08003348out:
Miao Xieedd14002013-06-27 18:51:00 +08003349 mutex_unlock(&inode->i_mutex);
Miao Xie826aa0a2013-06-27 18:50:59 +08003350 iput(inode);
Stefan Behrensff023aa2012-11-06 11:43:11 +01003351 return ret;
3352}
3353
3354static int write_page_nocow(struct scrub_ctx *sctx,
3355 u64 physical_for_dev_replace, struct page *page)
3356{
3357 struct bio *bio;
3358 struct btrfs_device *dev;
3359 int ret;
Stefan Behrensff023aa2012-11-06 11:43:11 +01003360
3361 dev = sctx->wr_ctx.tgtdev;
3362 if (!dev)
3363 return -EIO;
3364 if (!dev->bdev) {
3365 printk_ratelimited(KERN_WARNING
Frank Holtonefe120a2013-12-20 11:37:06 -05003366 "BTRFS: scrub write_page_nocow(bdev == NULL) is unexpected!\n");
Stefan Behrensff023aa2012-11-06 11:43:11 +01003367 return -EIO;
3368 }
Chris Mason9be33952013-05-17 18:30:14 -04003369 bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
Stefan Behrensff023aa2012-11-06 11:43:11 +01003370 if (!bio) {
3371 spin_lock(&sctx->stat_lock);
3372 sctx->stat.malloc_errors++;
3373 spin_unlock(&sctx->stat_lock);
3374 return -ENOMEM;
3375 }
Kent Overstreet4f024f32013-10-11 15:44:27 -07003376 bio->bi_iter.bi_size = 0;
3377 bio->bi_iter.bi_sector = physical_for_dev_replace >> 9;
Stefan Behrensff023aa2012-11-06 11:43:11 +01003378 bio->bi_bdev = dev->bdev;
3379 ret = bio_add_page(bio, page, PAGE_CACHE_SIZE, 0);
3380 if (ret != PAGE_CACHE_SIZE) {
3381leave_with_eio:
3382 bio_put(bio);
3383 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS);
3384 return -EIO;
3385 }
Stefan Behrensff023aa2012-11-06 11:43:11 +01003386
Kent Overstreet33879d42013-11-23 22:33:32 -08003387 if (btrfsic_submit_bio_wait(WRITE_SYNC, bio))
Stefan Behrensff023aa2012-11-06 11:43:11 +01003388 goto leave_with_eio;
3389
3390 bio_put(bio);
3391 return 0;
3392}