blob: a7196c49d15d5265df304ac6c2591ff8e1d1a5f3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * raid10.c : Multiple Devices driver for Linux
3 *
4 * Copyright (C) 2000-2004 Neil Brown
5 *
6 * RAID-10 support for md.
7 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -03008 * Base on code in raid1.c. See raid1.c for further copyright information.
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 *
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2, or (at your option)
14 * any later version.
15 *
16 * You should have received a copy of the GNU General Public License
17 * (for example /usr/src/linux/COPYING); if not, write to the Free
18 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090021#include <linux/slab.h>
Stephen Rothwell25570722008-10-15 09:09:21 +110022#include <linux/delay.h>
NeilBrownbff61972009-03-31 14:33:13 +110023#include <linux/blkdev.h>
Paul Gortmaker056075c2011-07-03 13:58:33 -040024#include <linux/module.h>
NeilBrownbff61972009-03-31 14:33:13 +110025#include <linux/seq_file.h>
Christian Dietrich8bda4702011-07-27 11:00:36 +100026#include <linux/ratelimit.h>
NeilBrown3ea7daa2012-05-22 13:53:47 +100027#include <linux/kthread.h>
NeilBrown43b2e5d2009-03-31 14:33:13 +110028#include "md.h"
Christoph Hellwigef740c32009-03-31 14:27:03 +110029#include "raid10.h"
Trela, Maciejdab8b292010-03-08 16:02:45 +110030#include "raid0.h"
Christoph Hellwigef740c32009-03-31 14:27:03 +110031#include "bitmap.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
33/*
34 * RAID10 provides a combination of RAID0 and RAID1 functionality.
35 * The layout of data is defined by
36 * chunk_size
37 * raid_disks
38 * near_copies (stored in low byte of layout)
39 * far_copies (stored in second byte of layout)
NeilBrownc93983b2006-06-26 00:27:41 -070040 * far_offset (stored in bit 16 of layout )
Jonathan Brassow475901a2013-02-21 13:28:10 +110041 * use_far_sets (stored in bit 17 of layout )
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 *
Jonathan Brassow475901a2013-02-21 13:28:10 +110043 * The data to be stored is divided into chunks using chunksize. Each device
44 * is divided into far_copies sections. In each section, chunks are laid out
45 * in a style similar to raid0, but near_copies copies of each chunk is stored
46 * (each on a different drive). The starting device for each section is offset
47 * near_copies from the starting device of the previous section. Thus there
48 * are (near_copies * far_copies) of each chunk, and each is on a different
49 * drive. near_copies and far_copies must be at least one, and their product
50 * is at most raid_disks.
NeilBrownc93983b2006-06-26 00:27:41 -070051 *
52 * If far_offset is true, then the far_copies are handled a bit differently.
Jonathan Brassow475901a2013-02-21 13:28:10 +110053 * The copies are still in different stripes, but instead of being very far
54 * apart on disk, there are adjacent stripes.
55 *
56 * The far and offset algorithms are handled slightly differently if
57 * 'use_far_sets' is true. In this case, the array's devices are grouped into
58 * sets that are (near_copies * far_copies) in size. The far copied stripes
59 * are still shifted by 'near_copies' devices, but this shifting stays confined
60 * to the set rather than the entire array. This is done to improve the number
61 * of device combinations that can fail without causing the array to fail.
62 * Example 'far' algorithm w/o 'use_far_sets' (each letter represents a chunk
63 * on a device):
64 * A B C D A B C D E
65 * ... ...
66 * D A B C E A B C D
67 * Example 'far' algorithm w/ 'use_far_sets' enabled (sets illustrated w/ []'s):
68 * [A B] [C D] [A B] [C D E]
69 * |...| |...| |...| | ... |
70 * [B A] [D C] [B A] [E C D]
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 */
72
73/*
74 * Number of guaranteed r10bios in case of extreme VM load:
75 */
76#define NR_RAID10_BIOS 256
77
Jonathan Brassow473e87c2012-07-31 10:03:52 +100078/* when we get a read error on a read-only array, we redirect to another
79 * device without failing the first device, or trying to over-write to
80 * correct the read error. To keep track of bad blocks on a per-bio
81 * level, we store IO_BLOCKED in the appropriate 'bios' pointer
82 */
83#define IO_BLOCKED ((struct bio *)1)
84/* When we successfully write to a known bad-block, we need to remove the
85 * bad-block marking which must be done from process context. So we record
86 * the success by setting devs[n].bio to IO_MADE_GOOD
87 */
88#define IO_MADE_GOOD ((struct bio *)2)
89
90#define BIO_SPECIAL(bio) ((unsigned long)bio <= 2)
91
92/* When there are this many requests queued to be written by
NeilBrown34db0cd2011-10-11 16:50:01 +110093 * the raid10 thread, we become 'congested' to provide back-pressure
94 * for writeback.
95 */
96static int max_queued_requests = 1024;
97
NeilBrowne879a872011-10-11 16:49:02 +110098static void allow_barrier(struct r10conf *conf);
99static void lower_barrier(struct r10conf *conf);
NeilBrown635f6412013-06-11 14:57:09 +1000100static int _enough(struct r10conf *conf, int previous, int ignore);
NeilBrown3ea7daa2012-05-22 13:53:47 +1000101static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr,
102 int *skipped);
103static void reshape_request_write(struct mddev *mddev, struct r10bio *r10_bio);
104static void end_reshape_write(struct bio *bio, int error);
105static void end_reshape(struct r10conf *conf);
NeilBrown0a27ec92006-01-06 00:20:13 -0800106
Al Virodd0fc662005-10-07 07:46:04 +0100107static void * r10bio_pool_alloc(gfp_t gfp_flags, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108{
NeilBrowne879a872011-10-11 16:49:02 +1100109 struct r10conf *conf = data;
NeilBrown9f2c9d12011-10-11 16:48:43 +1100110 int size = offsetof(struct r10bio, devs[conf->copies]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
NeilBrown69335ef2011-12-23 10:17:54 +1100112 /* allocate a r10bio with room for raid_disks entries in the
113 * bios array */
Jens Axboe7eaceac2011-03-10 08:52:07 +0100114 return kzalloc(size, gfp_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115}
116
117static void r10bio_pool_free(void *r10_bio, void *data)
118{
119 kfree(r10_bio);
120}
121
NeilBrown0310fa22008-08-05 15:54:14 +1000122/* Maximum size of each resync request */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123#define RESYNC_BLOCK_SIZE (64*1024)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124#define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE)
NeilBrown0310fa22008-08-05 15:54:14 +1000125/* amount of memory to reserve for resync requests */
126#define RESYNC_WINDOW (1024*1024)
127/* maximum number of concurrent requests, memory permitting */
128#define RESYNC_DEPTH (32*1024*1024/RESYNC_BLOCK_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
130/*
131 * When performing a resync, we need to read and compare, so
132 * we need as many pages are there are copies.
133 * When performing a recovery, we need 2 bios, one for read,
134 * one for write (we recover only one drive per r10buf)
135 *
136 */
Al Virodd0fc662005-10-07 07:46:04 +0100137static void * r10buf_pool_alloc(gfp_t gfp_flags, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138{
NeilBrowne879a872011-10-11 16:49:02 +1100139 struct r10conf *conf = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 struct page *page;
NeilBrown9f2c9d12011-10-11 16:48:43 +1100141 struct r10bio *r10_bio;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 struct bio *bio;
143 int i, j;
144 int nalloc;
145
146 r10_bio = r10bio_pool_alloc(gfp_flags, conf);
Jens Axboe7eaceac2011-03-10 08:52:07 +0100147 if (!r10_bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
NeilBrown3ea7daa2012-05-22 13:53:47 +1000150 if (test_bit(MD_RECOVERY_SYNC, &conf->mddev->recovery) ||
151 test_bit(MD_RECOVERY_RESHAPE, &conf->mddev->recovery))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 nalloc = conf->copies; /* resync */
153 else
154 nalloc = 2; /* recovery */
155
156 /*
157 * Allocate bios.
158 */
159 for (j = nalloc ; j-- ; ) {
NeilBrown67465572010-10-26 17:33:54 +1100160 bio = bio_kmalloc(gfp_flags, RESYNC_PAGES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 if (!bio)
162 goto out_free_bio;
163 r10_bio->devs[j].bio = bio;
NeilBrown69335ef2011-12-23 10:17:54 +1100164 if (!conf->have_replacement)
165 continue;
166 bio = bio_kmalloc(gfp_flags, RESYNC_PAGES);
167 if (!bio)
168 goto out_free_bio;
169 r10_bio->devs[j].repl_bio = bio;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 }
171 /*
172 * Allocate RESYNC_PAGES data pages and attach them
173 * where needed.
174 */
175 for (j = 0 ; j < nalloc; j++) {
NeilBrown69335ef2011-12-23 10:17:54 +1100176 struct bio *rbio = r10_bio->devs[j].repl_bio;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 bio = r10_bio->devs[j].bio;
178 for (i = 0; i < RESYNC_PAGES; i++) {
NeilBrown3ea7daa2012-05-22 13:53:47 +1000179 if (j > 0 && !test_bit(MD_RECOVERY_SYNC,
180 &conf->mddev->recovery)) {
181 /* we can share bv_page's during recovery
182 * and reshape */
Namhyung Kimc65060a2011-07-18 17:38:49 +1000183 struct bio *rbio = r10_bio->devs[0].bio;
184 page = rbio->bi_io_vec[i].bv_page;
185 get_page(page);
186 } else
187 page = alloc_page(gfp_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 if (unlikely(!page))
189 goto out_free_pages;
190
191 bio->bi_io_vec[i].bv_page = page;
NeilBrown69335ef2011-12-23 10:17:54 +1100192 if (rbio)
193 rbio->bi_io_vec[i].bv_page = page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 }
195 }
196
197 return r10_bio;
198
199out_free_pages:
200 for ( ; i > 0 ; i--)
NeilBrown1345b1d2006-01-06 00:20:40 -0800201 safe_put_page(bio->bi_io_vec[i-1].bv_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 while (j--)
203 for (i = 0; i < RESYNC_PAGES ; i++)
NeilBrown1345b1d2006-01-06 00:20:40 -0800204 safe_put_page(r10_bio->devs[j].bio->bi_io_vec[i].bv_page);
majianpeng5fdd2cf2012-05-22 13:55:03 +1000205 j = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206out_free_bio:
majianpeng5fdd2cf2012-05-22 13:55:03 +1000207 for ( ; j < nalloc; j++) {
208 if (r10_bio->devs[j].bio)
209 bio_put(r10_bio->devs[j].bio);
NeilBrown69335ef2011-12-23 10:17:54 +1100210 if (r10_bio->devs[j].repl_bio)
211 bio_put(r10_bio->devs[j].repl_bio);
212 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 r10bio_pool_free(r10_bio, conf);
214 return NULL;
215}
216
217static void r10buf_pool_free(void *__r10_bio, void *data)
218{
219 int i;
NeilBrowne879a872011-10-11 16:49:02 +1100220 struct r10conf *conf = data;
NeilBrown9f2c9d12011-10-11 16:48:43 +1100221 struct r10bio *r10bio = __r10_bio;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 int j;
223
224 for (j=0; j < conf->copies; j++) {
225 struct bio *bio = r10bio->devs[j].bio;
226 if (bio) {
227 for (i = 0; i < RESYNC_PAGES; i++) {
NeilBrown1345b1d2006-01-06 00:20:40 -0800228 safe_put_page(bio->bi_io_vec[i].bv_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 bio->bi_io_vec[i].bv_page = NULL;
230 }
231 bio_put(bio);
232 }
NeilBrown69335ef2011-12-23 10:17:54 +1100233 bio = r10bio->devs[j].repl_bio;
234 if (bio)
235 bio_put(bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 }
237 r10bio_pool_free(r10bio, conf);
238}
239
NeilBrowne879a872011-10-11 16:49:02 +1100240static void put_all_bios(struct r10conf *conf, struct r10bio *r10_bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241{
242 int i;
243
244 for (i = 0; i < conf->copies; i++) {
245 struct bio **bio = & r10_bio->devs[i].bio;
NeilBrown749c55e2011-07-28 11:39:24 +1000246 if (!BIO_SPECIAL(*bio))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 bio_put(*bio);
248 *bio = NULL;
NeilBrown69335ef2011-12-23 10:17:54 +1100249 bio = &r10_bio->devs[i].repl_bio;
250 if (r10_bio->read_slot < 0 && !BIO_SPECIAL(*bio))
251 bio_put(*bio);
252 *bio = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 }
254}
255
NeilBrown9f2c9d12011-10-11 16:48:43 +1100256static void free_r10bio(struct r10bio *r10_bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257{
NeilBrowne879a872011-10-11 16:49:02 +1100258 struct r10conf *conf = r10_bio->mddev->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 put_all_bios(conf, r10_bio);
261 mempool_free(r10_bio, conf->r10bio_pool);
262}
263
NeilBrown9f2c9d12011-10-11 16:48:43 +1100264static void put_buf(struct r10bio *r10_bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265{
NeilBrowne879a872011-10-11 16:49:02 +1100266 struct r10conf *conf = r10_bio->mddev->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
268 mempool_free(r10_bio, conf->r10buf_pool);
269
NeilBrown0a27ec92006-01-06 00:20:13 -0800270 lower_barrier(conf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271}
272
NeilBrown9f2c9d12011-10-11 16:48:43 +1100273static void reschedule_retry(struct r10bio *r10_bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274{
275 unsigned long flags;
NeilBrownfd01b882011-10-11 16:47:53 +1100276 struct mddev *mddev = r10_bio->mddev;
NeilBrowne879a872011-10-11 16:49:02 +1100277 struct r10conf *conf = mddev->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
279 spin_lock_irqsave(&conf->device_lock, flags);
280 list_add(&r10_bio->retry_list, &conf->retry_list);
NeilBrown4443ae12006-01-06 00:20:28 -0800281 conf->nr_queued ++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 spin_unlock_irqrestore(&conf->device_lock, flags);
283
Arthur Jones388667b2008-07-25 12:03:38 -0700284 /* wake up frozen array... */
285 wake_up(&conf->wait_barrier);
286
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 md_wakeup_thread(mddev->thread);
288}
289
290/*
291 * raid_end_bio_io() is called when we have finished servicing a mirrored
292 * operation and are ready to return a success/failure code to the buffer
293 * cache layer.
294 */
NeilBrown9f2c9d12011-10-11 16:48:43 +1100295static void raid_end_bio_io(struct r10bio *r10_bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296{
297 struct bio *bio = r10_bio->master_bio;
NeilBrown856e08e2011-07-28 11:39:23 +1000298 int done;
NeilBrowne879a872011-10-11 16:49:02 +1100299 struct r10conf *conf = r10_bio->mddev->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
NeilBrown856e08e2011-07-28 11:39:23 +1000301 if (bio->bi_phys_segments) {
302 unsigned long flags;
303 spin_lock_irqsave(&conf->device_lock, flags);
304 bio->bi_phys_segments--;
305 done = (bio->bi_phys_segments == 0);
306 spin_unlock_irqrestore(&conf->device_lock, flags);
307 } else
308 done = 1;
309 if (!test_bit(R10BIO_Uptodate, &r10_bio->state))
310 clear_bit(BIO_UPTODATE, &bio->bi_flags);
311 if (done) {
312 bio_endio(bio, 0);
313 /*
314 * Wake up any possible resync thread that waits for the device
315 * to go idle.
316 */
317 allow_barrier(conf);
318 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 free_r10bio(r10_bio);
320}
321
322/*
323 * Update disk head position estimator based on IRQ completion info.
324 */
NeilBrown9f2c9d12011-10-11 16:48:43 +1100325static inline void update_head_pos(int slot, struct r10bio *r10_bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326{
NeilBrowne879a872011-10-11 16:49:02 +1100327 struct r10conf *conf = r10_bio->mddev->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
329 conf->mirrors[r10_bio->devs[slot].devnum].head_position =
330 r10_bio->devs[slot].addr + (r10_bio->sectors);
331}
332
Namhyung Kim778ca012011-07-18 17:38:47 +1000333/*
334 * Find the disk number which triggered given bio
335 */
NeilBrowne879a872011-10-11 16:49:02 +1100336static int find_bio_disk(struct r10conf *conf, struct r10bio *r10_bio,
NeilBrown69335ef2011-12-23 10:17:54 +1100337 struct bio *bio, int *slotp, int *replp)
Namhyung Kim778ca012011-07-18 17:38:47 +1000338{
339 int slot;
NeilBrown69335ef2011-12-23 10:17:54 +1100340 int repl = 0;
Namhyung Kim778ca012011-07-18 17:38:47 +1000341
NeilBrown69335ef2011-12-23 10:17:54 +1100342 for (slot = 0; slot < conf->copies; slot++) {
Namhyung Kim778ca012011-07-18 17:38:47 +1000343 if (r10_bio->devs[slot].bio == bio)
344 break;
NeilBrown69335ef2011-12-23 10:17:54 +1100345 if (r10_bio->devs[slot].repl_bio == bio) {
346 repl = 1;
347 break;
348 }
349 }
Namhyung Kim778ca012011-07-18 17:38:47 +1000350
351 BUG_ON(slot == conf->copies);
352 update_head_pos(slot, r10_bio);
353
NeilBrown749c55e2011-07-28 11:39:24 +1000354 if (slotp)
355 *slotp = slot;
NeilBrown69335ef2011-12-23 10:17:54 +1100356 if (replp)
357 *replp = repl;
Namhyung Kim778ca012011-07-18 17:38:47 +1000358 return r10_bio->devs[slot].devnum;
359}
360
NeilBrown6712ecf2007-09-27 12:47:43 +0200361static void raid10_end_read_request(struct bio *bio, int error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362{
363 int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
NeilBrown9f2c9d12011-10-11 16:48:43 +1100364 struct r10bio *r10_bio = bio->bi_private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 int slot, dev;
NeilBrownabbf0982011-12-23 10:17:54 +1100366 struct md_rdev *rdev;
NeilBrowne879a872011-10-11 16:49:02 +1100367 struct r10conf *conf = r10_bio->mddev->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 slot = r10_bio->read_slot;
370 dev = r10_bio->devs[slot].devnum;
NeilBrownabbf0982011-12-23 10:17:54 +1100371 rdev = r10_bio->devs[slot].rdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 /*
373 * this branch is our 'one mirror IO has finished' event handler:
374 */
NeilBrown4443ae12006-01-06 00:20:28 -0800375 update_head_pos(slot, r10_bio);
376
377 if (uptodate) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 /*
379 * Set R10BIO_Uptodate in our master bio, so that
380 * we will return a good error code to the higher
381 * levels even if IO on some other mirrored buffer fails.
382 *
383 * The 'master' represents the composite IO operation to
384 * user-side. So if something waits for IO, then it will
385 * wait for the 'master' bio.
386 */
387 set_bit(R10BIO_Uptodate, &r10_bio->state);
NeilBrownfae8cc52012-02-14 11:10:10 +1100388 } else {
389 /* If all other devices that store this block have
390 * failed, we want to return the error upwards rather
391 * than fail the last device. Here we redefine
392 * "uptodate" to mean "Don't want to retry"
393 */
NeilBrown635f6412013-06-11 14:57:09 +1000394 if (!_enough(conf, test_bit(R10BIO_Previous, &r10_bio->state),
395 rdev->raid_disk))
NeilBrownfae8cc52012-02-14 11:10:10 +1100396 uptodate = 1;
NeilBrownfae8cc52012-02-14 11:10:10 +1100397 }
398 if (uptodate) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 raid_end_bio_io(r10_bio);
NeilBrownabbf0982011-12-23 10:17:54 +1100400 rdev_dec_pending(rdev, conf->mddev);
NeilBrown4443ae12006-01-06 00:20:28 -0800401 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 /*
NeilBrown7c4e06f2011-05-11 14:53:17 +1000403 * oops, read error - keep the refcount on the rdev
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 */
405 char b[BDEVNAME_SIZE];
Christian Dietrich8bda4702011-07-27 11:00:36 +1000406 printk_ratelimited(KERN_ERR
407 "md/raid10:%s: %s: rescheduling sector %llu\n",
408 mdname(conf->mddev),
NeilBrownabbf0982011-12-23 10:17:54 +1100409 bdevname(rdev->bdev, b),
Christian Dietrich8bda4702011-07-27 11:00:36 +1000410 (unsigned long long)r10_bio->sector);
NeilBrown856e08e2011-07-28 11:39:23 +1000411 set_bit(R10BIO_ReadError, &r10_bio->state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 reschedule_retry(r10_bio);
413 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414}
415
NeilBrown9f2c9d12011-10-11 16:48:43 +1100416static void close_write(struct r10bio *r10_bio)
NeilBrownbd870a12011-07-28 11:39:24 +1000417{
418 /* clear the bitmap if all writes complete successfully */
419 bitmap_endwrite(r10_bio->mddev->bitmap, r10_bio->sector,
420 r10_bio->sectors,
421 !test_bit(R10BIO_Degraded, &r10_bio->state),
422 0);
423 md_write_end(r10_bio->mddev);
424}
425
NeilBrown9f2c9d12011-10-11 16:48:43 +1100426static void one_write_done(struct r10bio *r10_bio)
NeilBrown19d5f832011-09-10 17:21:17 +1000427{
428 if (atomic_dec_and_test(&r10_bio->remaining)) {
429 if (test_bit(R10BIO_WriteError, &r10_bio->state))
430 reschedule_retry(r10_bio);
431 else {
432 close_write(r10_bio);
433 if (test_bit(R10BIO_MadeGood, &r10_bio->state))
434 reschedule_retry(r10_bio);
435 else
436 raid_end_bio_io(r10_bio);
437 }
438 }
439}
440
NeilBrown6712ecf2007-09-27 12:47:43 +0200441static void raid10_end_write_request(struct bio *bio, int error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442{
443 int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
NeilBrown9f2c9d12011-10-11 16:48:43 +1100444 struct r10bio *r10_bio = bio->bi_private;
Namhyung Kim778ca012011-07-18 17:38:47 +1000445 int dev;
NeilBrown749c55e2011-07-28 11:39:24 +1000446 int dec_rdev = 1;
NeilBrowne879a872011-10-11 16:49:02 +1100447 struct r10conf *conf = r10_bio->mddev->private;
NeilBrown475b0322011-12-23 10:17:55 +1100448 int slot, repl;
NeilBrown4ca40c22011-12-23 10:17:55 +1100449 struct md_rdev *rdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450
NeilBrown475b0322011-12-23 10:17:55 +1100451 dev = find_bio_disk(conf, r10_bio, bio, &slot, &repl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
NeilBrown475b0322011-12-23 10:17:55 +1100453 if (repl)
454 rdev = conf->mirrors[dev].replacement;
NeilBrown4ca40c22011-12-23 10:17:55 +1100455 if (!rdev) {
456 smp_rmb();
457 repl = 0;
NeilBrown475b0322011-12-23 10:17:55 +1100458 rdev = conf->mirrors[dev].rdev;
NeilBrown4ca40c22011-12-23 10:17:55 +1100459 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 /*
461 * this branch is our 'one mirror IO has finished' event handler:
462 */
NeilBrown6cce3b232006-01-06 00:20:16 -0800463 if (!uptodate) {
NeilBrown475b0322011-12-23 10:17:55 +1100464 if (repl)
465 /* Never record new bad blocks to replacement,
466 * just fail it.
467 */
468 md_error(rdev->mddev, rdev);
469 else {
470 set_bit(WriteErrorSeen, &rdev->flags);
NeilBrownb7044d42011-12-23 10:17:56 +1100471 if (!test_and_set_bit(WantReplacement, &rdev->flags))
472 set_bit(MD_RECOVERY_NEEDED,
473 &rdev->mddev->recovery);
NeilBrown475b0322011-12-23 10:17:55 +1100474 set_bit(R10BIO_WriteError, &r10_bio->state);
475 dec_rdev = 0;
476 }
NeilBrown749c55e2011-07-28 11:39:24 +1000477 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 /*
479 * Set R10BIO_Uptodate in our master bio, so that
480 * we will return a good error code for to the higher
481 * levels even if IO on some other mirrored buffer fails.
482 *
483 * The 'master' represents the composite IO operation to
484 * user-side. So if something waits for IO, then it will
485 * wait for the 'master' bio.
486 */
NeilBrown749c55e2011-07-28 11:39:24 +1000487 sector_t first_bad;
488 int bad_sectors;
489
Alex Lyakas3056e3a2013-06-04 20:42:21 +0300490 /*
491 * Do not set R10BIO_Uptodate if the current device is
492 * rebuilding or Faulty. This is because we cannot use
493 * such device for properly reading the data back (we could
494 * potentially use it, if the current write would have felt
495 * before rdev->recovery_offset, but for simplicity we don't
496 * check this here.
497 */
498 if (test_bit(In_sync, &rdev->flags) &&
499 !test_bit(Faulty, &rdev->flags))
500 set_bit(R10BIO_Uptodate, &r10_bio->state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501
NeilBrown749c55e2011-07-28 11:39:24 +1000502 /* Maybe we can clear some bad blocks. */
NeilBrown475b0322011-12-23 10:17:55 +1100503 if (is_badblock(rdev,
NeilBrown749c55e2011-07-28 11:39:24 +1000504 r10_bio->devs[slot].addr,
505 r10_bio->sectors,
506 &first_bad, &bad_sectors)) {
507 bio_put(bio);
NeilBrown475b0322011-12-23 10:17:55 +1100508 if (repl)
509 r10_bio->devs[slot].repl_bio = IO_MADE_GOOD;
510 else
511 r10_bio->devs[slot].bio = IO_MADE_GOOD;
NeilBrown749c55e2011-07-28 11:39:24 +1000512 dec_rdev = 0;
513 set_bit(R10BIO_MadeGood, &r10_bio->state);
514 }
515 }
516
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 /*
518 *
519 * Let's see if all mirrored write operations have finished
520 * already.
521 */
NeilBrown19d5f832011-09-10 17:21:17 +1000522 one_write_done(r10_bio);
NeilBrown749c55e2011-07-28 11:39:24 +1000523 if (dec_rdev)
NeilBrown884162d2012-11-22 15:12:09 +1100524 rdev_dec_pending(rdev, conf->mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525}
526
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527/*
528 * RAID10 layout manager
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300529 * As well as the chunksize and raid_disks count, there are two
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 * parameters: near_copies and far_copies.
531 * near_copies * far_copies must be <= raid_disks.
532 * Normally one of these will be 1.
533 * If both are 1, we get raid0.
534 * If near_copies == raid_disks, we get raid1.
535 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300536 * Chunks are laid out in raid0 style with near_copies copies of the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 * first chunk, followed by near_copies copies of the next chunk and
538 * so on.
539 * If far_copies > 1, then after 1/far_copies of the array has been assigned
540 * as described above, we start again with a device offset of near_copies.
541 * So we effectively have another copy of the whole array further down all
542 * the drives, but with blocks on different drives.
543 * With this layout, and block is never stored twice on the one device.
544 *
545 * raid10_find_phys finds the sector offset of a given virtual sector
NeilBrownc93983b2006-06-26 00:27:41 -0700546 * on each device that it is on.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 *
548 * raid10_find_virt does the reverse mapping, from a device and a
549 * sector offset to a virtual address
550 */
551
NeilBrownf8c9e742012-05-21 09:28:33 +1000552static void __raid10_find_phys(struct geom *geo, struct r10bio *r10bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553{
554 int n,f;
555 sector_t sector;
556 sector_t chunk;
557 sector_t stripe;
558 int dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 int slot = 0;
Jonathan Brassow9a3152a2013-02-21 13:28:10 +1100560 int last_far_set_start, last_far_set_size;
561
562 last_far_set_start = (geo->raid_disks / geo->far_set_size) - 1;
563 last_far_set_start *= geo->far_set_size;
564
565 last_far_set_size = geo->far_set_size;
566 last_far_set_size += (geo->raid_disks % geo->far_set_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567
568 /* now calculate first sector/dev */
NeilBrown5cf00fc2012-05-21 09:28:20 +1000569 chunk = r10bio->sector >> geo->chunk_shift;
570 sector = r10bio->sector & geo->chunk_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571
NeilBrown5cf00fc2012-05-21 09:28:20 +1000572 chunk *= geo->near_copies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 stripe = chunk;
NeilBrown5cf00fc2012-05-21 09:28:20 +1000574 dev = sector_div(stripe, geo->raid_disks);
575 if (geo->far_offset)
576 stripe *= geo->far_copies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577
NeilBrown5cf00fc2012-05-21 09:28:20 +1000578 sector += stripe << geo->chunk_shift;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
580 /* and calculate all the others */
NeilBrown5cf00fc2012-05-21 09:28:20 +1000581 for (n = 0; n < geo->near_copies; n++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 int d = dev;
Jonathan Brassow475901a2013-02-21 13:28:10 +1100583 int set;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 sector_t s = sector;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 r10bio->devs[slot].devnum = d;
Jonathan Brassow4c0ca262013-02-21 13:28:09 +1100586 r10bio->devs[slot].addr = s;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 slot++;
588
NeilBrown5cf00fc2012-05-21 09:28:20 +1000589 for (f = 1; f < geo->far_copies; f++) {
Jonathan Brassow475901a2013-02-21 13:28:10 +1100590 set = d / geo->far_set_size;
NeilBrown5cf00fc2012-05-21 09:28:20 +1000591 d += geo->near_copies;
Jonathan Brassow475901a2013-02-21 13:28:10 +1100592
Jonathan Brassow9a3152a2013-02-21 13:28:10 +1100593 if ((geo->raid_disks % geo->far_set_size) &&
594 (d > last_far_set_start)) {
595 d -= last_far_set_start;
596 d %= last_far_set_size;
597 d += last_far_set_start;
598 } else {
599 d %= geo->far_set_size;
600 d += geo->far_set_size * set;
601 }
NeilBrown5cf00fc2012-05-21 09:28:20 +1000602 s += geo->stride;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 r10bio->devs[slot].devnum = d;
604 r10bio->devs[slot].addr = s;
605 slot++;
606 }
607 dev++;
NeilBrown5cf00fc2012-05-21 09:28:20 +1000608 if (dev >= geo->raid_disks) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 dev = 0;
NeilBrown5cf00fc2012-05-21 09:28:20 +1000610 sector += (geo->chunk_mask + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 }
612 }
NeilBrownf8c9e742012-05-21 09:28:33 +1000613}
614
615static void raid10_find_phys(struct r10conf *conf, struct r10bio *r10bio)
616{
617 struct geom *geo = &conf->geo;
618
619 if (conf->reshape_progress != MaxSector &&
620 ((r10bio->sector >= conf->reshape_progress) !=
621 conf->mddev->reshape_backwards)) {
622 set_bit(R10BIO_Previous, &r10bio->state);
623 geo = &conf->prev;
624 } else
625 clear_bit(R10BIO_Previous, &r10bio->state);
626
627 __raid10_find_phys(geo, r10bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628}
629
NeilBrowne879a872011-10-11 16:49:02 +1100630static sector_t raid10_find_virt(struct r10conf *conf, sector_t sector, int dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631{
632 sector_t offset, chunk, vchunk;
NeilBrownf8c9e742012-05-21 09:28:33 +1000633 /* Never use conf->prev as this is only called during resync
634 * or recovery, so reshape isn't happening
635 */
NeilBrown5cf00fc2012-05-21 09:28:20 +1000636 struct geom *geo = &conf->geo;
Jonathan Brassow475901a2013-02-21 13:28:10 +1100637 int far_set_start = (dev / geo->far_set_size) * geo->far_set_size;
638 int far_set_size = geo->far_set_size;
Jonathan Brassow9a3152a2013-02-21 13:28:10 +1100639 int last_far_set_start;
640
641 if (geo->raid_disks % geo->far_set_size) {
642 last_far_set_start = (geo->raid_disks / geo->far_set_size) - 1;
643 last_far_set_start *= geo->far_set_size;
644
645 if (dev >= last_far_set_start) {
646 far_set_size = geo->far_set_size;
647 far_set_size += (geo->raid_disks % geo->far_set_size);
648 far_set_start = last_far_set_start;
649 }
650 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651
NeilBrown5cf00fc2012-05-21 09:28:20 +1000652 offset = sector & geo->chunk_mask;
653 if (geo->far_offset) {
NeilBrownc93983b2006-06-26 00:27:41 -0700654 int fc;
NeilBrown5cf00fc2012-05-21 09:28:20 +1000655 chunk = sector >> geo->chunk_shift;
656 fc = sector_div(chunk, geo->far_copies);
657 dev -= fc * geo->near_copies;
Jonathan Brassow475901a2013-02-21 13:28:10 +1100658 if (dev < far_set_start)
659 dev += far_set_size;
NeilBrownc93983b2006-06-26 00:27:41 -0700660 } else {
NeilBrown5cf00fc2012-05-21 09:28:20 +1000661 while (sector >= geo->stride) {
662 sector -= geo->stride;
Jonathan Brassow475901a2013-02-21 13:28:10 +1100663 if (dev < (geo->near_copies + far_set_start))
664 dev += far_set_size - geo->near_copies;
NeilBrownc93983b2006-06-26 00:27:41 -0700665 else
NeilBrown5cf00fc2012-05-21 09:28:20 +1000666 dev -= geo->near_copies;
NeilBrownc93983b2006-06-26 00:27:41 -0700667 }
NeilBrown5cf00fc2012-05-21 09:28:20 +1000668 chunk = sector >> geo->chunk_shift;
NeilBrownc93983b2006-06-26 00:27:41 -0700669 }
NeilBrown5cf00fc2012-05-21 09:28:20 +1000670 vchunk = chunk * geo->raid_disks + dev;
671 sector_div(vchunk, geo->near_copies);
672 return (vchunk << geo->chunk_shift) + offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673}
674
675/**
676 * raid10_mergeable_bvec -- tell bio layer if a two requests can be merged
NeilBrown64590f42014-12-15 12:56:57 +1100677 * @mddev: the md device
Alasdair G Kergoncc371e62008-07-03 09:53:43 +0200678 * @bvm: properties of new bio
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 * @biovec: the request that could be merged to it.
680 *
681 * Return amount of bytes we can accept at this offset
NeilBrown050b6612012-03-19 12:46:39 +1100682 * This requires checking for end-of-chunk if near_copies != raid_disks,
683 * and for subordinate merge_bvec_fns if merge_check_needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 */
NeilBrown64590f42014-12-15 12:56:57 +1100685static int raid10_mergeable_bvec(struct mddev *mddev,
Alasdair G Kergoncc371e62008-07-03 09:53:43 +0200686 struct bvec_merge_data *bvm,
687 struct bio_vec *biovec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688{
NeilBrown050b6612012-03-19 12:46:39 +1100689 struct r10conf *conf = mddev->private;
Alasdair G Kergoncc371e62008-07-03 09:53:43 +0200690 sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 int max;
NeilBrown3ea7daa2012-05-22 13:53:47 +1000692 unsigned int chunk_sectors;
Alasdair G Kergoncc371e62008-07-03 09:53:43 +0200693 unsigned int bio_sectors = bvm->bi_size >> 9;
NeilBrown5cf00fc2012-05-21 09:28:20 +1000694 struct geom *geo = &conf->geo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695
NeilBrown3ea7daa2012-05-22 13:53:47 +1000696 chunk_sectors = (conf->geo.chunk_mask & conf->prev.chunk_mask) + 1;
NeilBrownf8c9e742012-05-21 09:28:33 +1000697 if (conf->reshape_progress != MaxSector &&
698 ((sector >= conf->reshape_progress) !=
699 conf->mddev->reshape_backwards))
700 geo = &conf->prev;
701
NeilBrown5cf00fc2012-05-21 09:28:20 +1000702 if (geo->near_copies < geo->raid_disks) {
NeilBrown050b6612012-03-19 12:46:39 +1100703 max = (chunk_sectors - ((sector & (chunk_sectors - 1))
704 + bio_sectors)) << 9;
705 if (max < 0)
706 /* bio_add cannot handle a negative return */
707 max = 0;
708 if (max <= biovec->bv_len && bio_sectors == 0)
709 return biovec->bv_len;
710 } else
711 max = biovec->bv_len;
712
713 if (mddev->merge_check_needed) {
NeilBrowne0ee7782012-08-18 09:51:42 +1000714 struct {
715 struct r10bio r10_bio;
716 struct r10dev devs[conf->copies];
717 } on_stack;
718 struct r10bio *r10_bio = &on_stack.r10_bio;
NeilBrown050b6612012-03-19 12:46:39 +1100719 int s;
NeilBrownf8c9e742012-05-21 09:28:33 +1000720 if (conf->reshape_progress != MaxSector) {
721 /* Cannot give any guidance during reshape */
722 if (max <= biovec->bv_len && bio_sectors == 0)
723 return biovec->bv_len;
724 return 0;
725 }
NeilBrowne0ee7782012-08-18 09:51:42 +1000726 r10_bio->sector = sector;
727 raid10_find_phys(conf, r10_bio);
NeilBrown050b6612012-03-19 12:46:39 +1100728 rcu_read_lock();
729 for (s = 0; s < conf->copies; s++) {
NeilBrowne0ee7782012-08-18 09:51:42 +1000730 int disk = r10_bio->devs[s].devnum;
NeilBrown050b6612012-03-19 12:46:39 +1100731 struct md_rdev *rdev = rcu_dereference(
732 conf->mirrors[disk].rdev);
733 if (rdev && !test_bit(Faulty, &rdev->flags)) {
734 struct request_queue *q =
735 bdev_get_queue(rdev->bdev);
736 if (q->merge_bvec_fn) {
NeilBrowne0ee7782012-08-18 09:51:42 +1000737 bvm->bi_sector = r10_bio->devs[s].addr
NeilBrown050b6612012-03-19 12:46:39 +1100738 + rdev->data_offset;
739 bvm->bi_bdev = rdev->bdev;
740 max = min(max, q->merge_bvec_fn(
741 q, bvm, biovec));
742 }
743 }
744 rdev = rcu_dereference(conf->mirrors[disk].replacement);
745 if (rdev && !test_bit(Faulty, &rdev->flags)) {
746 struct request_queue *q =
747 bdev_get_queue(rdev->bdev);
748 if (q->merge_bvec_fn) {
NeilBrowne0ee7782012-08-18 09:51:42 +1000749 bvm->bi_sector = r10_bio->devs[s].addr
NeilBrown050b6612012-03-19 12:46:39 +1100750 + rdev->data_offset;
751 bvm->bi_bdev = rdev->bdev;
752 max = min(max, q->merge_bvec_fn(
753 q, bvm, biovec));
754 }
755 }
756 }
757 rcu_read_unlock();
758 }
759 return max;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760}
761
762/*
763 * This routine returns the disk from which the requested read should
764 * be done. There is a per-array 'next expected sequential IO' sector
765 * number - if this matches on the next IO then we use the last disk.
766 * There is also a per-disk 'last know head position' sector that is
767 * maintained from IRQ contexts, both the normal and the resync IO
768 * completion handlers update this position correctly. If there is no
769 * perfect sequential match then we pick the disk whose head is closest.
770 *
771 * If there are 2 mirrors in the same 2 devices, performance degrades
772 * because position is mirror, not device based.
773 *
774 * The rdev for the device selected will have nr_pending incremented.
775 */
776
777/*
778 * FIXME: possibly should rethink readbalancing and do it differently
779 * depending on near_copies / far_copies geometry.
780 */
NeilBrown96c3fd12011-12-23 10:17:54 +1100781static struct md_rdev *read_balance(struct r10conf *conf,
782 struct r10bio *r10_bio,
783 int *max_sectors)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784{
NeilBrownaf3a2cd2010-05-08 08:20:17 +1000785 const sector_t this_sector = r10_bio->sector;
NeilBrown56d99122011-05-11 14:27:03 +1000786 int disk, slot;
NeilBrown856e08e2011-07-28 11:39:23 +1000787 int sectors = r10_bio->sectors;
788 int best_good_sectors;
NeilBrown56d99122011-05-11 14:27:03 +1000789 sector_t new_distance, best_dist;
Jonathan Brassow3bbae042012-07-31 10:03:52 +1000790 struct md_rdev *best_rdev, *rdev = NULL;
NeilBrown56d99122011-05-11 14:27:03 +1000791 int do_balance;
792 int best_slot;
NeilBrown5cf00fc2012-05-21 09:28:20 +1000793 struct geom *geo = &conf->geo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794
795 raid10_find_phys(conf, r10_bio);
796 rcu_read_lock();
NeilBrown56d99122011-05-11 14:27:03 +1000797retry:
NeilBrown856e08e2011-07-28 11:39:23 +1000798 sectors = r10_bio->sectors;
NeilBrown56d99122011-05-11 14:27:03 +1000799 best_slot = -1;
NeilBrownabbf0982011-12-23 10:17:54 +1100800 best_rdev = NULL;
NeilBrown56d99122011-05-11 14:27:03 +1000801 best_dist = MaxSector;
NeilBrown856e08e2011-07-28 11:39:23 +1000802 best_good_sectors = 0;
NeilBrown56d99122011-05-11 14:27:03 +1000803 do_balance = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 /*
805 * Check if we can balance. We can balance on the whole
NeilBrown6cce3b232006-01-06 00:20:16 -0800806 * device if no resync is going on (recovery is ok), or below
807 * the resync window. We take the first readable disk when
808 * above the resync window.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 */
810 if (conf->mddev->recovery_cp < MaxSector
NeilBrown56d99122011-05-11 14:27:03 +1000811 && (this_sector + sectors >= conf->next_resync))
812 do_balance = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
NeilBrown56d99122011-05-11 14:27:03 +1000814 for (slot = 0; slot < conf->copies ; slot++) {
NeilBrown856e08e2011-07-28 11:39:23 +1000815 sector_t first_bad;
816 int bad_sectors;
817 sector_t dev_sector;
818
NeilBrown56d99122011-05-11 14:27:03 +1000819 if (r10_bio->devs[slot].bio == IO_BLOCKED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 continue;
NeilBrown56d99122011-05-11 14:27:03 +1000821 disk = r10_bio->devs[slot].devnum;
NeilBrownabbf0982011-12-23 10:17:54 +1100822 rdev = rcu_dereference(conf->mirrors[disk].replacement);
823 if (rdev == NULL || test_bit(Faulty, &rdev->flags) ||
NeilBrown050b6612012-03-19 12:46:39 +1100824 test_bit(Unmerged, &rdev->flags) ||
NeilBrownabbf0982011-12-23 10:17:54 +1100825 r10_bio->devs[slot].addr + sectors > rdev->recovery_offset)
826 rdev = rcu_dereference(conf->mirrors[disk].rdev);
NeilBrown050b6612012-03-19 12:46:39 +1100827 if (rdev == NULL ||
828 test_bit(Faulty, &rdev->flags) ||
829 test_bit(Unmerged, &rdev->flags))
NeilBrownabbf0982011-12-23 10:17:54 +1100830 continue;
831 if (!test_bit(In_sync, &rdev->flags) &&
832 r10_bio->devs[slot].addr + sectors > rdev->recovery_offset)
NeilBrown56d99122011-05-11 14:27:03 +1000833 continue;
834
NeilBrown856e08e2011-07-28 11:39:23 +1000835 dev_sector = r10_bio->devs[slot].addr;
836 if (is_badblock(rdev, dev_sector, sectors,
837 &first_bad, &bad_sectors)) {
838 if (best_dist < MaxSector)
839 /* Already have a better slot */
840 continue;
841 if (first_bad <= dev_sector) {
842 /* Cannot read here. If this is the
843 * 'primary' device, then we must not read
844 * beyond 'bad_sectors' from another device.
845 */
846 bad_sectors -= (dev_sector - first_bad);
847 if (!do_balance && sectors > bad_sectors)
848 sectors = bad_sectors;
849 if (best_good_sectors > sectors)
850 best_good_sectors = sectors;
851 } else {
852 sector_t good_sectors =
853 first_bad - dev_sector;
854 if (good_sectors > best_good_sectors) {
855 best_good_sectors = good_sectors;
856 best_slot = slot;
NeilBrownabbf0982011-12-23 10:17:54 +1100857 best_rdev = rdev;
NeilBrown856e08e2011-07-28 11:39:23 +1000858 }
859 if (!do_balance)
860 /* Must read from here */
861 break;
862 }
863 continue;
864 } else
865 best_good_sectors = sectors;
866
NeilBrown56d99122011-05-11 14:27:03 +1000867 if (!do_balance)
868 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
NeilBrown22dfdf52005-11-28 13:44:09 -0800870 /* This optimisation is debatable, and completely destroys
871 * sequential read speed for 'far copies' arrays. So only
872 * keep it for 'near' arrays, and review those later.
873 */
NeilBrown5cf00fc2012-05-21 09:28:20 +1000874 if (geo->near_copies > 1 && !atomic_read(&rdev->nr_pending))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 break;
Keld Simonsen8ed3a192008-03-04 14:29:34 -0800876
877 /* for far > 1 always use the lowest address */
NeilBrown5cf00fc2012-05-21 09:28:20 +1000878 if (geo->far_copies > 1)
NeilBrown56d99122011-05-11 14:27:03 +1000879 new_distance = r10_bio->devs[slot].addr;
Keld Simonsen8ed3a192008-03-04 14:29:34 -0800880 else
NeilBrown56d99122011-05-11 14:27:03 +1000881 new_distance = abs(r10_bio->devs[slot].addr -
882 conf->mirrors[disk].head_position);
883 if (new_distance < best_dist) {
884 best_dist = new_distance;
885 best_slot = slot;
NeilBrownabbf0982011-12-23 10:17:54 +1100886 best_rdev = rdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 }
888 }
NeilBrownabbf0982011-12-23 10:17:54 +1100889 if (slot >= conf->copies) {
NeilBrown56d99122011-05-11 14:27:03 +1000890 slot = best_slot;
NeilBrownabbf0982011-12-23 10:17:54 +1100891 rdev = best_rdev;
892 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893
NeilBrown56d99122011-05-11 14:27:03 +1000894 if (slot >= 0) {
NeilBrown56d99122011-05-11 14:27:03 +1000895 atomic_inc(&rdev->nr_pending);
896 if (test_bit(Faulty, &rdev->flags)) {
897 /* Cannot risk returning a device that failed
898 * before we inc'ed nr_pending
899 */
900 rdev_dec_pending(rdev, conf->mddev);
901 goto retry;
902 }
903 r10_bio->read_slot = slot;
904 } else
NeilBrown96c3fd12011-12-23 10:17:54 +1100905 rdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 rcu_read_unlock();
NeilBrown856e08e2011-07-28 11:39:23 +1000907 *max_sectors = best_good_sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908
NeilBrown96c3fd12011-12-23 10:17:54 +1100909 return rdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910}
911
NeilBrown5c675f82014-12-15 12:56:56 +1100912static int raid10_congested(struct mddev *mddev, int bits)
NeilBrown0d129222006-10-03 01:15:54 -0700913{
NeilBrowne879a872011-10-11 16:49:02 +1100914 struct r10conf *conf = mddev->private;
NeilBrown0d129222006-10-03 01:15:54 -0700915 int i, ret = 0;
916
NeilBrown34db0cd2011-10-11 16:50:01 +1100917 if ((bits & (1 << BDI_async_congested)) &&
918 conf->pending_count >= max_queued_requests)
919 return 1;
920
NeilBrown0d129222006-10-03 01:15:54 -0700921 rcu_read_lock();
NeilBrownf8c9e742012-05-21 09:28:33 +1000922 for (i = 0;
923 (i < conf->geo.raid_disks || i < conf->prev.raid_disks)
924 && ret == 0;
925 i++) {
NeilBrown3cb03002011-10-11 16:45:26 +1100926 struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev);
NeilBrown0d129222006-10-03 01:15:54 -0700927 if (rdev && !test_bit(Faulty, &rdev->flags)) {
Jens Axboe165125e2007-07-24 09:28:11 +0200928 struct request_queue *q = bdev_get_queue(rdev->bdev);
NeilBrown0d129222006-10-03 01:15:54 -0700929
930 ret |= bdi_congested(&q->backing_dev_info, bits);
931 }
932 }
933 rcu_read_unlock();
934 return ret;
935}
936
NeilBrowne879a872011-10-11 16:49:02 +1100937static void flush_pending_writes(struct r10conf *conf)
NeilBrowna35e63e2008-03-04 14:29:29 -0800938{
939 /* Any writes that have been queued but are awaiting
940 * bitmap updates get flushed here.
NeilBrowna35e63e2008-03-04 14:29:29 -0800941 */
NeilBrowna35e63e2008-03-04 14:29:29 -0800942 spin_lock_irq(&conf->device_lock);
943
944 if (conf->pending_bio_list.head) {
945 struct bio *bio;
946 bio = bio_list_get(&conf->pending_bio_list);
NeilBrown34db0cd2011-10-11 16:50:01 +1100947 conf->pending_count = 0;
NeilBrowna35e63e2008-03-04 14:29:29 -0800948 spin_unlock_irq(&conf->device_lock);
949 /* flush any pending bitmap writes to disk
950 * before proceeding w/ I/O */
951 bitmap_unplug(conf->mddev->bitmap);
NeilBrown34db0cd2011-10-11 16:50:01 +1100952 wake_up(&conf->wait_barrier);
NeilBrowna35e63e2008-03-04 14:29:29 -0800953
954 while (bio) { /* submit pending writes */
955 struct bio *next = bio->bi_next;
956 bio->bi_next = NULL;
Shaohua Li532a2a32012-10-11 13:30:52 +1100957 if (unlikely((bio->bi_rw & REQ_DISCARD) &&
958 !blk_queue_discard(bdev_get_queue(bio->bi_bdev))))
959 /* Just ignore it */
960 bio_endio(bio, 0);
961 else
962 generic_make_request(bio);
NeilBrowna35e63e2008-03-04 14:29:29 -0800963 bio = next;
964 }
NeilBrowna35e63e2008-03-04 14:29:29 -0800965 } else
966 spin_unlock_irq(&conf->device_lock);
NeilBrowna35e63e2008-03-04 14:29:29 -0800967}
Jens Axboe7eaceac2011-03-10 08:52:07 +0100968
NeilBrown0a27ec92006-01-06 00:20:13 -0800969/* Barriers....
970 * Sometimes we need to suspend IO while we do something else,
971 * either some resync/recovery, or reconfigure the array.
972 * To do this we raise a 'barrier'.
973 * The 'barrier' is a counter that can be raised multiple times
974 * to count how many activities are happening which preclude
975 * normal IO.
976 * We can only raise the barrier if there is no pending IO.
977 * i.e. if nr_pending == 0.
978 * We choose only to raise the barrier if no-one is waiting for the
979 * barrier to go down. This means that as soon as an IO request
980 * is ready, no other operations which require a barrier will start
981 * until the IO request has had a chance.
982 *
983 * So: regular IO calls 'wait_barrier'. When that returns there
984 * is no backgroup IO happening, It must arrange to call
985 * allow_barrier when it has finished its IO.
986 * backgroup IO calls must call raise_barrier. Once that returns
987 * there is no normal IO happeing. It must arrange to call
988 * lower_barrier when the particular background IO completes.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990
NeilBrowne879a872011-10-11 16:49:02 +1100991static void raise_barrier(struct r10conf *conf, int force)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992{
NeilBrown6cce3b232006-01-06 00:20:16 -0800993 BUG_ON(force && !conf->barrier);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 spin_lock_irq(&conf->resync_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995
NeilBrown6cce3b232006-01-06 00:20:16 -0800996 /* Wait until no block IO is waiting (unless 'force') */
997 wait_event_lock_irq(conf->wait_barrier, force || !conf->nr_waiting,
Lukas Czernereed8c022012-11-30 11:42:40 +0100998 conf->resync_lock);
NeilBrown0a27ec92006-01-06 00:20:13 -0800999
1000 /* block any new IO from starting */
1001 conf->barrier++;
1002
NeilBrownc3b328a2011-04-18 18:25:43 +10001003 /* Now wait for all pending IO to complete */
NeilBrown0a27ec92006-01-06 00:20:13 -08001004 wait_event_lock_irq(conf->wait_barrier,
1005 !conf->nr_pending && conf->barrier < RESYNC_DEPTH,
Lukas Czernereed8c022012-11-30 11:42:40 +01001006 conf->resync_lock);
NeilBrown0a27ec92006-01-06 00:20:13 -08001007
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 spin_unlock_irq(&conf->resync_lock);
1009}
1010
NeilBrowne879a872011-10-11 16:49:02 +11001011static void lower_barrier(struct r10conf *conf)
NeilBrown0a27ec92006-01-06 00:20:13 -08001012{
1013 unsigned long flags;
1014 spin_lock_irqsave(&conf->resync_lock, flags);
1015 conf->barrier--;
1016 spin_unlock_irqrestore(&conf->resync_lock, flags);
1017 wake_up(&conf->wait_barrier);
1018}
1019
NeilBrowne879a872011-10-11 16:49:02 +11001020static void wait_barrier(struct r10conf *conf)
NeilBrown0a27ec92006-01-06 00:20:13 -08001021{
1022 spin_lock_irq(&conf->resync_lock);
1023 if (conf->barrier) {
1024 conf->nr_waiting++;
NeilBrownd6b42dc2012-03-19 12:46:38 +11001025 /* Wait for the barrier to drop.
1026 * However if there are already pending
1027 * requests (preventing the barrier from
1028 * rising completely), and the
1029 * pre-process bio queue isn't empty,
1030 * then don't wait, as we need to empty
1031 * that queue to get the nr_pending
1032 * count down.
1033 */
1034 wait_event_lock_irq(conf->wait_barrier,
1035 !conf->barrier ||
1036 (conf->nr_pending &&
1037 current->bio_list &&
1038 !bio_list_empty(current->bio_list)),
Lukas Czernereed8c022012-11-30 11:42:40 +01001039 conf->resync_lock);
NeilBrown0a27ec92006-01-06 00:20:13 -08001040 conf->nr_waiting--;
1041 }
1042 conf->nr_pending++;
1043 spin_unlock_irq(&conf->resync_lock);
1044}
1045
NeilBrowne879a872011-10-11 16:49:02 +11001046static void allow_barrier(struct r10conf *conf)
NeilBrown0a27ec92006-01-06 00:20:13 -08001047{
1048 unsigned long flags;
1049 spin_lock_irqsave(&conf->resync_lock, flags);
1050 conf->nr_pending--;
1051 spin_unlock_irqrestore(&conf->resync_lock, flags);
1052 wake_up(&conf->wait_barrier);
1053}
1054
NeilBrowne2d59922013-06-12 11:01:22 +10001055static void freeze_array(struct r10conf *conf, int extra)
NeilBrown4443ae12006-01-06 00:20:28 -08001056{
1057 /* stop syncio and normal IO and wait for everything to
NeilBrownf1885932006-01-06 00:20:42 -08001058 * go quiet.
NeilBrown4443ae12006-01-06 00:20:28 -08001059 * We increment barrier and nr_waiting, and then
NeilBrowne2d59922013-06-12 11:01:22 +10001060 * wait until nr_pending match nr_queued+extra
NeilBrown1c830532008-03-04 14:29:35 -08001061 * This is called in the context of one normal IO request
1062 * that has failed. Thus any sync request that might be pending
1063 * will be blocked by nr_pending, and we need to wait for
1064 * pending IO requests to complete or be queued for re-try.
NeilBrowne2d59922013-06-12 11:01:22 +10001065 * Thus the number queued (nr_queued) plus this request (extra)
NeilBrown1c830532008-03-04 14:29:35 -08001066 * must match the number of pending IOs (nr_pending) before
1067 * we continue.
NeilBrown4443ae12006-01-06 00:20:28 -08001068 */
1069 spin_lock_irq(&conf->resync_lock);
1070 conf->barrier++;
1071 conf->nr_waiting++;
Lukas Czernereed8c022012-11-30 11:42:40 +01001072 wait_event_lock_irq_cmd(conf->wait_barrier,
NeilBrowne2d59922013-06-12 11:01:22 +10001073 conf->nr_pending == conf->nr_queued+extra,
Lukas Czernereed8c022012-11-30 11:42:40 +01001074 conf->resync_lock,
1075 flush_pending_writes(conf));
NeilBrownc3b328a2011-04-18 18:25:43 +10001076
NeilBrown4443ae12006-01-06 00:20:28 -08001077 spin_unlock_irq(&conf->resync_lock);
1078}
1079
NeilBrowne879a872011-10-11 16:49:02 +11001080static void unfreeze_array(struct r10conf *conf)
NeilBrown4443ae12006-01-06 00:20:28 -08001081{
1082 /* reverse the effect of the freeze */
1083 spin_lock_irq(&conf->resync_lock);
1084 conf->barrier--;
1085 conf->nr_waiting--;
1086 wake_up(&conf->wait_barrier);
1087 spin_unlock_irq(&conf->resync_lock);
1088}
1089
NeilBrownf8c9e742012-05-21 09:28:33 +10001090static sector_t choose_data_offset(struct r10bio *r10_bio,
1091 struct md_rdev *rdev)
1092{
1093 if (!test_bit(MD_RECOVERY_RESHAPE, &rdev->mddev->recovery) ||
1094 test_bit(R10BIO_Previous, &r10_bio->state))
1095 return rdev->data_offset;
1096 else
1097 return rdev->new_data_offset;
1098}
1099
NeilBrown57c67df2012-10-11 13:32:13 +11001100struct raid10_plug_cb {
1101 struct blk_plug_cb cb;
1102 struct bio_list pending;
1103 int pending_cnt;
1104};
1105
1106static void raid10_unplug(struct blk_plug_cb *cb, bool from_schedule)
1107{
1108 struct raid10_plug_cb *plug = container_of(cb, struct raid10_plug_cb,
1109 cb);
1110 struct mddev *mddev = plug->cb.data;
1111 struct r10conf *conf = mddev->private;
1112 struct bio *bio;
1113
NeilBrown874807a2012-11-27 12:14:40 +11001114 if (from_schedule || current->bio_list) {
NeilBrown57c67df2012-10-11 13:32:13 +11001115 spin_lock_irq(&conf->device_lock);
1116 bio_list_merge(&conf->pending_bio_list, &plug->pending);
1117 conf->pending_count += plug->pending_cnt;
1118 spin_unlock_irq(&conf->device_lock);
NeilBrownee0b0242013-02-25 12:38:29 +11001119 wake_up(&conf->wait_barrier);
NeilBrown57c67df2012-10-11 13:32:13 +11001120 md_wakeup_thread(mddev->thread);
1121 kfree(plug);
1122 return;
1123 }
1124
1125 /* we aren't scheduling, so we can do the write-out directly. */
1126 bio = bio_list_get(&plug->pending);
1127 bitmap_unplug(mddev->bitmap);
1128 wake_up(&conf->wait_barrier);
1129
1130 while (bio) { /* submit pending writes */
1131 struct bio *next = bio->bi_next;
1132 bio->bi_next = NULL;
Shaohua Li32f9f572013-04-28 18:26:38 +08001133 if (unlikely((bio->bi_rw & REQ_DISCARD) &&
1134 !blk_queue_discard(bdev_get_queue(bio->bi_bdev))))
1135 /* Just ignore it */
1136 bio_endio(bio, 0);
1137 else
1138 generic_make_request(bio);
NeilBrown57c67df2012-10-11 13:32:13 +11001139 bio = next;
1140 }
1141 kfree(plug);
1142}
1143
Kent Overstreet20d01892013-11-23 18:21:01 -08001144static void __make_request(struct mddev *mddev, struct bio *bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145{
NeilBrowne879a872011-10-11 16:49:02 +11001146 struct r10conf *conf = mddev->private;
NeilBrown9f2c9d12011-10-11 16:48:43 +11001147 struct r10bio *r10_bio;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 struct bio *read_bio;
1149 int i;
Jens Axboea3623572005-11-01 09:26:16 +01001150 const int rw = bio_data_dir(bio);
NeilBrown2c7d46e2010-08-18 16:16:05 +10001151 const unsigned long do_sync = (bio->bi_rw & REQ_SYNC);
Tejun Heoe9c74692010-09-03 11:56:18 +02001152 const unsigned long do_fua = (bio->bi_rw & REQ_FUA);
Shaohua Li532a2a32012-10-11 13:30:52 +11001153 const unsigned long do_discard = (bio->bi_rw
1154 & (REQ_DISCARD | REQ_SECURE));
Joe Lawrencec8dc9c62013-02-21 13:28:09 +11001155 const unsigned long do_same = (bio->bi_rw & REQ_WRITE_SAME);
NeilBrown6cce3b232006-01-06 00:20:16 -08001156 unsigned long flags;
NeilBrown3cb03002011-10-11 16:45:26 +11001157 struct md_rdev *blocked_rdev;
NeilBrown57c67df2012-10-11 13:32:13 +11001158 struct blk_plug_cb *cb;
1159 struct raid10_plug_cb *plug = NULL;
NeilBrownd4432c22011-07-28 11:39:24 +10001160 int sectors_handled;
1161 int max_sectors;
NeilBrown3ea7daa2012-05-22 13:53:47 +10001162 int sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163
NeilBrowncc13b1d2014-05-05 13:34:37 +10001164 /*
1165 * Register the new request and wait if the reconstruction
1166 * thread has put up a bar for new requests.
1167 * Continue immediately if no resync is active currently.
1168 */
1169 wait_barrier(conf);
1170
Kent Overstreetaa8b57a2013-02-05 15:19:29 -08001171 sectors = bio_sectors(bio);
NeilBrown3ea7daa2012-05-22 13:53:47 +10001172 while (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
Kent Overstreet4f024f32013-10-11 15:44:27 -07001173 bio->bi_iter.bi_sector < conf->reshape_progress &&
1174 bio->bi_iter.bi_sector + sectors > conf->reshape_progress) {
NeilBrown3ea7daa2012-05-22 13:53:47 +10001175 /* IO spans the reshape position. Need to wait for
1176 * reshape to pass
1177 */
1178 allow_barrier(conf);
1179 wait_event(conf->wait_barrier,
Kent Overstreet4f024f32013-10-11 15:44:27 -07001180 conf->reshape_progress <= bio->bi_iter.bi_sector ||
1181 conf->reshape_progress >= bio->bi_iter.bi_sector +
1182 sectors);
NeilBrown3ea7daa2012-05-22 13:53:47 +10001183 wait_barrier(conf);
1184 }
1185 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
1186 bio_data_dir(bio) == WRITE &&
1187 (mddev->reshape_backwards
Kent Overstreet4f024f32013-10-11 15:44:27 -07001188 ? (bio->bi_iter.bi_sector < conf->reshape_safe &&
1189 bio->bi_iter.bi_sector + sectors > conf->reshape_progress)
1190 : (bio->bi_iter.bi_sector + sectors > conf->reshape_safe &&
1191 bio->bi_iter.bi_sector < conf->reshape_progress))) {
NeilBrown3ea7daa2012-05-22 13:53:47 +10001192 /* Need to update reshape_position in metadata */
1193 mddev->reshape_position = conf->reshape_progress;
1194 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1195 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1196 md_wakeup_thread(mddev->thread);
1197 wait_event(mddev->sb_wait,
1198 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
1199
1200 conf->reshape_safe = mddev->reshape_position;
1201 }
1202
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO);
1204
1205 r10_bio->master_bio = bio;
NeilBrown3ea7daa2012-05-22 13:53:47 +10001206 r10_bio->sectors = sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207
1208 r10_bio->mddev = mddev;
Kent Overstreet4f024f32013-10-11 15:44:27 -07001209 r10_bio->sector = bio->bi_iter.bi_sector;
NeilBrown6cce3b232006-01-06 00:20:16 -08001210 r10_bio->state = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211
NeilBrown856e08e2011-07-28 11:39:23 +10001212 /* We might need to issue multiple reads to different
1213 * devices if there are bad blocks around, so we keep
1214 * track of the number of reads in bio->bi_phys_segments.
1215 * If this is 0, there is only one r10_bio and no locking
1216 * will be needed when the request completes. If it is
1217 * non-zero, then it is the number of not-completed requests.
1218 */
1219 bio->bi_phys_segments = 0;
1220 clear_bit(BIO_SEG_VALID, &bio->bi_flags);
1221
Jens Axboea3623572005-11-01 09:26:16 +01001222 if (rw == READ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 /*
1224 * read balancing logic:
1225 */
NeilBrown96c3fd12011-12-23 10:17:54 +11001226 struct md_rdev *rdev;
NeilBrown856e08e2011-07-28 11:39:23 +10001227 int slot;
1228
1229read_again:
NeilBrown96c3fd12011-12-23 10:17:54 +11001230 rdev = read_balance(conf, r10_bio, &max_sectors);
1231 if (!rdev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 raid_end_bio_io(r10_bio);
Christoph Hellwig5a7bbad2011-09-12 12:12:01 +02001233 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234 }
NeilBrown96c3fd12011-12-23 10:17:54 +11001235 slot = r10_bio->read_slot;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236
NeilBrowna167f662010-10-26 18:31:13 +11001237 read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev);
Kent Overstreet4f024f32013-10-11 15:44:27 -07001238 bio_trim(read_bio, r10_bio->sector - bio->bi_iter.bi_sector,
Kent Overstreet6678d832013-08-07 11:14:32 -07001239 max_sectors);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240
1241 r10_bio->devs[slot].bio = read_bio;
NeilBrownabbf0982011-12-23 10:17:54 +11001242 r10_bio->devs[slot].rdev = rdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243
Kent Overstreet4f024f32013-10-11 15:44:27 -07001244 read_bio->bi_iter.bi_sector = r10_bio->devs[slot].addr +
NeilBrownf8c9e742012-05-21 09:28:33 +10001245 choose_data_offset(r10_bio, rdev);
NeilBrown96c3fd12011-12-23 10:17:54 +11001246 read_bio->bi_bdev = rdev->bdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 read_bio->bi_end_io = raid10_end_read_request;
Christoph Hellwig7b6d91d2010-08-07 18:20:39 +02001248 read_bio->bi_rw = READ | do_sync;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249 read_bio->bi_private = r10_bio;
1250
NeilBrown856e08e2011-07-28 11:39:23 +10001251 if (max_sectors < r10_bio->sectors) {
1252 /* Could not read all from this device, so we will
1253 * need another r10_bio.
1254 */
NeilBrownb50c2592014-01-14 10:38:09 +11001255 sectors_handled = (r10_bio->sector + max_sectors
Kent Overstreet4f024f32013-10-11 15:44:27 -07001256 - bio->bi_iter.bi_sector);
NeilBrown856e08e2011-07-28 11:39:23 +10001257 r10_bio->sectors = max_sectors;
1258 spin_lock_irq(&conf->device_lock);
1259 if (bio->bi_phys_segments == 0)
1260 bio->bi_phys_segments = 2;
1261 else
1262 bio->bi_phys_segments++;
NeilBrownb50c2592014-01-14 10:38:09 +11001263 spin_unlock_irq(&conf->device_lock);
NeilBrown856e08e2011-07-28 11:39:23 +10001264 /* Cannot call generic_make_request directly
1265 * as that will be queued in __generic_make_request
1266 * and subsequent mempool_alloc might block
1267 * waiting for it. so hand bio over to raid10d.
1268 */
1269 reschedule_retry(r10_bio);
1270
1271 r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO);
1272
1273 r10_bio->master_bio = bio;
Kent Overstreetaa8b57a2013-02-05 15:19:29 -08001274 r10_bio->sectors = bio_sectors(bio) - sectors_handled;
NeilBrown856e08e2011-07-28 11:39:23 +10001275 r10_bio->state = 0;
1276 r10_bio->mddev = mddev;
Kent Overstreet4f024f32013-10-11 15:44:27 -07001277 r10_bio->sector = bio->bi_iter.bi_sector +
1278 sectors_handled;
NeilBrown856e08e2011-07-28 11:39:23 +10001279 goto read_again;
1280 } else
1281 generic_make_request(read_bio);
Christoph Hellwig5a7bbad2011-09-12 12:12:01 +02001282 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283 }
1284
1285 /*
1286 * WRITE:
1287 */
NeilBrown34db0cd2011-10-11 16:50:01 +11001288 if (conf->pending_count >= max_queued_requests) {
1289 md_wakeup_thread(mddev->thread);
1290 wait_event(conf->wait_barrier,
1291 conf->pending_count < max_queued_requests);
1292 }
Dan Williams6bfe0b42008-04-30 00:52:32 -07001293 /* first select target devices under rcu_lock and
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294 * inc refcount on their rdev. Record them by setting
1295 * bios[x] to bio
NeilBrownd4432c22011-07-28 11:39:24 +10001296 * If there are known/acknowledged bad blocks on any device
1297 * on which we have seen a write error, we want to avoid
1298 * writing to those blocks. This potentially requires several
1299 * writes to write around the bad blocks. Each set of writes
1300 * gets its own r10_bio with a set of bios attached. The number
1301 * of r10_bios is recored in bio->bi_phys_segments just as with
1302 * the read case.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 */
NeilBrownc3b328a2011-04-18 18:25:43 +10001304
NeilBrown69335ef2011-12-23 10:17:54 +11001305 r10_bio->read_slot = -1; /* make sure repl_bio gets freed */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 raid10_find_phys(conf, r10_bio);
NeilBrownd4432c22011-07-28 11:39:24 +10001307retry_write:
Harvey Harrisoncb6969e2008-05-06 20:42:32 -07001308 blocked_rdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 rcu_read_lock();
NeilBrownd4432c22011-07-28 11:39:24 +10001310 max_sectors = r10_bio->sectors;
1311
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 for (i = 0; i < conf->copies; i++) {
1313 int d = r10_bio->devs[i].devnum;
NeilBrown3cb03002011-10-11 16:45:26 +11001314 struct md_rdev *rdev = rcu_dereference(conf->mirrors[d].rdev);
NeilBrown475b0322011-12-23 10:17:55 +11001315 struct md_rdev *rrdev = rcu_dereference(
1316 conf->mirrors[d].replacement);
NeilBrown4ca40c22011-12-23 10:17:55 +11001317 if (rdev == rrdev)
1318 rrdev = NULL;
Dan Williams6bfe0b42008-04-30 00:52:32 -07001319 if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) {
1320 atomic_inc(&rdev->nr_pending);
1321 blocked_rdev = rdev;
1322 break;
1323 }
NeilBrown475b0322011-12-23 10:17:55 +11001324 if (rrdev && unlikely(test_bit(Blocked, &rrdev->flags))) {
1325 atomic_inc(&rrdev->nr_pending);
1326 blocked_rdev = rrdev;
1327 break;
1328 }
NeilBrowne7c0c3f2012-11-22 14:42:49 +11001329 if (rdev && (test_bit(Faulty, &rdev->flags)
1330 || test_bit(Unmerged, &rdev->flags)))
1331 rdev = NULL;
NeilBrown050b6612012-03-19 12:46:39 +11001332 if (rrdev && (test_bit(Faulty, &rrdev->flags)
1333 || test_bit(Unmerged, &rrdev->flags)))
NeilBrown475b0322011-12-23 10:17:55 +11001334 rrdev = NULL;
1335
NeilBrownd4432c22011-07-28 11:39:24 +10001336 r10_bio->devs[i].bio = NULL;
NeilBrown475b0322011-12-23 10:17:55 +11001337 r10_bio->devs[i].repl_bio = NULL;
NeilBrowne7c0c3f2012-11-22 14:42:49 +11001338
1339 if (!rdev && !rrdev) {
NeilBrown6cce3b232006-01-06 00:20:16 -08001340 set_bit(R10BIO_Degraded, &r10_bio->state);
NeilBrownd4432c22011-07-28 11:39:24 +10001341 continue;
NeilBrown6cce3b232006-01-06 00:20:16 -08001342 }
NeilBrowne7c0c3f2012-11-22 14:42:49 +11001343 if (rdev && test_bit(WriteErrorSeen, &rdev->flags)) {
NeilBrownd4432c22011-07-28 11:39:24 +10001344 sector_t first_bad;
1345 sector_t dev_sector = r10_bio->devs[i].addr;
1346 int bad_sectors;
1347 int is_bad;
1348
1349 is_bad = is_badblock(rdev, dev_sector,
1350 max_sectors,
1351 &first_bad, &bad_sectors);
1352 if (is_bad < 0) {
1353 /* Mustn't write here until the bad block
1354 * is acknowledged
1355 */
1356 atomic_inc(&rdev->nr_pending);
1357 set_bit(BlockedBadBlocks, &rdev->flags);
1358 blocked_rdev = rdev;
1359 break;
1360 }
1361 if (is_bad && first_bad <= dev_sector) {
1362 /* Cannot write here at all */
1363 bad_sectors -= (dev_sector - first_bad);
1364 if (bad_sectors < max_sectors)
1365 /* Mustn't write more than bad_sectors
1366 * to other devices yet
1367 */
1368 max_sectors = bad_sectors;
1369 /* We don't set R10BIO_Degraded as that
1370 * only applies if the disk is missing,
1371 * so it might be re-added, and we want to
1372 * know to recover this chunk.
1373 * In this case the device is here, and the
1374 * fact that this chunk is not in-sync is
1375 * recorded in the bad block log.
1376 */
1377 continue;
1378 }
1379 if (is_bad) {
1380 int good_sectors = first_bad - dev_sector;
1381 if (good_sectors < max_sectors)
1382 max_sectors = good_sectors;
1383 }
1384 }
NeilBrowne7c0c3f2012-11-22 14:42:49 +11001385 if (rdev) {
1386 r10_bio->devs[i].bio = bio;
1387 atomic_inc(&rdev->nr_pending);
1388 }
NeilBrown475b0322011-12-23 10:17:55 +11001389 if (rrdev) {
1390 r10_bio->devs[i].repl_bio = bio;
1391 atomic_inc(&rrdev->nr_pending);
1392 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393 }
1394 rcu_read_unlock();
1395
Dan Williams6bfe0b42008-04-30 00:52:32 -07001396 if (unlikely(blocked_rdev)) {
1397 /* Have to wait for this device to get unblocked, then retry */
1398 int j;
1399 int d;
1400
NeilBrown475b0322011-12-23 10:17:55 +11001401 for (j = 0; j < i; j++) {
Dan Williams6bfe0b42008-04-30 00:52:32 -07001402 if (r10_bio->devs[j].bio) {
1403 d = r10_bio->devs[j].devnum;
1404 rdev_dec_pending(conf->mirrors[d].rdev, mddev);
1405 }
NeilBrown475b0322011-12-23 10:17:55 +11001406 if (r10_bio->devs[j].repl_bio) {
NeilBrown4ca40c22011-12-23 10:17:55 +11001407 struct md_rdev *rdev;
NeilBrown475b0322011-12-23 10:17:55 +11001408 d = r10_bio->devs[j].devnum;
NeilBrown4ca40c22011-12-23 10:17:55 +11001409 rdev = conf->mirrors[d].replacement;
1410 if (!rdev) {
1411 /* Race with remove_disk */
1412 smp_mb();
1413 rdev = conf->mirrors[d].rdev;
1414 }
1415 rdev_dec_pending(rdev, mddev);
NeilBrown475b0322011-12-23 10:17:55 +11001416 }
1417 }
Dan Williams6bfe0b42008-04-30 00:52:32 -07001418 allow_barrier(conf);
1419 md_wait_for_blocked_rdev(blocked_rdev, mddev);
1420 wait_barrier(conf);
1421 goto retry_write;
1422 }
1423
NeilBrownd4432c22011-07-28 11:39:24 +10001424 if (max_sectors < r10_bio->sectors) {
1425 /* We are splitting this into multiple parts, so
1426 * we need to prepare for allocating another r10_bio.
1427 */
1428 r10_bio->sectors = max_sectors;
1429 spin_lock_irq(&conf->device_lock);
1430 if (bio->bi_phys_segments == 0)
1431 bio->bi_phys_segments = 2;
1432 else
1433 bio->bi_phys_segments++;
1434 spin_unlock_irq(&conf->device_lock);
1435 }
Kent Overstreet4f024f32013-10-11 15:44:27 -07001436 sectors_handled = r10_bio->sector + max_sectors -
1437 bio->bi_iter.bi_sector;
NeilBrownd4432c22011-07-28 11:39:24 +10001438
NeilBrown4e780642010-10-19 12:54:01 +11001439 atomic_set(&r10_bio->remaining, 1);
NeilBrownd4432c22011-07-28 11:39:24 +10001440 bitmap_startwrite(mddev->bitmap, r10_bio->sector, r10_bio->sectors, 0);
NeilBrown06d91a52005-06-21 17:17:12 -07001441
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 for (i = 0; i < conf->copies; i++) {
1443 struct bio *mbio;
1444 int d = r10_bio->devs[i].devnum;
NeilBrowne7c0c3f2012-11-22 14:42:49 +11001445 if (r10_bio->devs[i].bio) {
1446 struct md_rdev *rdev = conf->mirrors[d].rdev;
1447 mbio = bio_clone_mddev(bio, GFP_NOIO, mddev);
Kent Overstreet4f024f32013-10-11 15:44:27 -07001448 bio_trim(mbio, r10_bio->sector - bio->bi_iter.bi_sector,
Kent Overstreet6678d832013-08-07 11:14:32 -07001449 max_sectors);
NeilBrowne7c0c3f2012-11-22 14:42:49 +11001450 r10_bio->devs[i].bio = mbio;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451
Kent Overstreet4f024f32013-10-11 15:44:27 -07001452 mbio->bi_iter.bi_sector = (r10_bio->devs[i].addr+
NeilBrowne7c0c3f2012-11-22 14:42:49 +11001453 choose_data_offset(r10_bio,
1454 rdev));
1455 mbio->bi_bdev = rdev->bdev;
1456 mbio->bi_end_io = raid10_end_write_request;
Joe Lawrencec8dc9c62013-02-21 13:28:09 +11001457 mbio->bi_rw =
1458 WRITE | do_sync | do_fua | do_discard | do_same;
NeilBrowne7c0c3f2012-11-22 14:42:49 +11001459 mbio->bi_private = r10_bio;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460
NeilBrowne7c0c3f2012-11-22 14:42:49 +11001461 atomic_inc(&r10_bio->remaining);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462
NeilBrowne7c0c3f2012-11-22 14:42:49 +11001463 cb = blk_check_plugged(raid10_unplug, mddev,
1464 sizeof(*plug));
1465 if (cb)
1466 plug = container_of(cb, struct raid10_plug_cb,
1467 cb);
1468 else
1469 plug = NULL;
1470 spin_lock_irqsave(&conf->device_lock, flags);
1471 if (plug) {
1472 bio_list_add(&plug->pending, mbio);
1473 plug->pending_cnt++;
1474 } else {
1475 bio_list_add(&conf->pending_bio_list, mbio);
1476 conf->pending_count++;
1477 }
1478 spin_unlock_irqrestore(&conf->device_lock, flags);
1479 if (!plug)
1480 md_wakeup_thread(mddev->thread);
1481 }
NeilBrown57c67df2012-10-11 13:32:13 +11001482
NeilBrowne7c0c3f2012-11-22 14:42:49 +11001483 if (r10_bio->devs[i].repl_bio) {
1484 struct md_rdev *rdev = conf->mirrors[d].replacement;
1485 if (rdev == NULL) {
1486 /* Replacement just got moved to main 'rdev' */
1487 smp_mb();
1488 rdev = conf->mirrors[d].rdev;
1489 }
1490 mbio = bio_clone_mddev(bio, GFP_NOIO, mddev);
Kent Overstreet4f024f32013-10-11 15:44:27 -07001491 bio_trim(mbio, r10_bio->sector - bio->bi_iter.bi_sector,
Kent Overstreet6678d832013-08-07 11:14:32 -07001492 max_sectors);
NeilBrowne7c0c3f2012-11-22 14:42:49 +11001493 r10_bio->devs[i].repl_bio = mbio;
1494
Kent Overstreet4f024f32013-10-11 15:44:27 -07001495 mbio->bi_iter.bi_sector = (r10_bio->devs[i].addr +
NeilBrowne7c0c3f2012-11-22 14:42:49 +11001496 choose_data_offset(
1497 r10_bio, rdev));
1498 mbio->bi_bdev = rdev->bdev;
1499 mbio->bi_end_io = raid10_end_write_request;
Joe Lawrencec8dc9c62013-02-21 13:28:09 +11001500 mbio->bi_rw =
1501 WRITE | do_sync | do_fua | do_discard | do_same;
NeilBrowne7c0c3f2012-11-22 14:42:49 +11001502 mbio->bi_private = r10_bio;
1503
1504 atomic_inc(&r10_bio->remaining);
1505 spin_lock_irqsave(&conf->device_lock, flags);
NeilBrown57c67df2012-10-11 13:32:13 +11001506 bio_list_add(&conf->pending_bio_list, mbio);
1507 conf->pending_count++;
NeilBrowne7c0c3f2012-11-22 14:42:49 +11001508 spin_unlock_irqrestore(&conf->device_lock, flags);
1509 if (!mddev_check_plugged(mddev))
1510 md_wakeup_thread(mddev->thread);
NeilBrown57c67df2012-10-11 13:32:13 +11001511 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512 }
1513
NeilBrown079fa162011-09-10 17:21:23 +10001514 /* Don't remove the bias on 'remaining' (one_write_done) until
1515 * after checking if we need to go around again.
1516 */
NeilBrowna35e63e2008-03-04 14:29:29 -08001517
Kent Overstreetaa8b57a2013-02-05 15:19:29 -08001518 if (sectors_handled < bio_sectors(bio)) {
NeilBrown079fa162011-09-10 17:21:23 +10001519 one_write_done(r10_bio);
NeilBrown5e570282011-07-28 11:39:25 +10001520 /* We need another r10_bio. It has already been counted
NeilBrownd4432c22011-07-28 11:39:24 +10001521 * in bio->bi_phys_segments.
1522 */
1523 r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO);
1524
1525 r10_bio->master_bio = bio;
Kent Overstreetaa8b57a2013-02-05 15:19:29 -08001526 r10_bio->sectors = bio_sectors(bio) - sectors_handled;
NeilBrownd4432c22011-07-28 11:39:24 +10001527
1528 r10_bio->mddev = mddev;
Kent Overstreet4f024f32013-10-11 15:44:27 -07001529 r10_bio->sector = bio->bi_iter.bi_sector + sectors_handled;
NeilBrownd4432c22011-07-28 11:39:24 +10001530 r10_bio->state = 0;
1531 goto retry_write;
1532 }
NeilBrown079fa162011-09-10 17:21:23 +10001533 one_write_done(r10_bio);
Kent Overstreet20d01892013-11-23 18:21:01 -08001534}
1535
1536static void make_request(struct mddev *mddev, struct bio *bio)
1537{
1538 struct r10conf *conf = mddev->private;
1539 sector_t chunk_mask = (conf->geo.chunk_mask & conf->prev.chunk_mask);
1540 int chunk_sects = chunk_mask + 1;
1541
1542 struct bio *split;
1543
1544 if (unlikely(bio->bi_rw & REQ_FLUSH)) {
1545 md_flush_request(mddev, bio);
1546 return;
1547 }
1548
1549 md_write_start(mddev, bio);
1550
Kent Overstreet20d01892013-11-23 18:21:01 -08001551 do {
1552
1553 /*
1554 * If this request crosses a chunk boundary, we need to split
1555 * it.
1556 */
1557 if (unlikely((bio->bi_iter.bi_sector & chunk_mask) +
1558 bio_sectors(bio) > chunk_sects
1559 && (conf->geo.near_copies < conf->geo.raid_disks
1560 || conf->prev.near_copies <
1561 conf->prev.raid_disks))) {
1562 split = bio_split(bio, chunk_sects -
1563 (bio->bi_iter.bi_sector &
1564 (chunk_sects - 1)),
1565 GFP_NOIO, fs_bio_set);
1566 bio_chain(split, bio);
1567 } else {
1568 split = bio;
1569 }
1570
1571 __make_request(mddev, split);
1572 } while (split != bio);
NeilBrown079fa162011-09-10 17:21:23 +10001573
1574 /* In case raid10d snuck in to freeze_array */
1575 wake_up(&conf->wait_barrier);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576}
1577
NeilBrownfd01b882011-10-11 16:47:53 +11001578static void status(struct seq_file *seq, struct mddev *mddev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579{
NeilBrowne879a872011-10-11 16:49:02 +11001580 struct r10conf *conf = mddev->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581 int i;
1582
NeilBrown5cf00fc2012-05-21 09:28:20 +10001583 if (conf->geo.near_copies < conf->geo.raid_disks)
Andre Noll9d8f0362009-06-18 08:45:01 +10001584 seq_printf(seq, " %dK chunks", mddev->chunk_sectors / 2);
NeilBrown5cf00fc2012-05-21 09:28:20 +10001585 if (conf->geo.near_copies > 1)
1586 seq_printf(seq, " %d near-copies", conf->geo.near_copies);
1587 if (conf->geo.far_copies > 1) {
1588 if (conf->geo.far_offset)
1589 seq_printf(seq, " %d offset-copies", conf->geo.far_copies);
NeilBrownc93983b2006-06-26 00:27:41 -07001590 else
NeilBrown5cf00fc2012-05-21 09:28:20 +10001591 seq_printf(seq, " %d far-copies", conf->geo.far_copies);
NeilBrownc93983b2006-06-26 00:27:41 -07001592 }
NeilBrown5cf00fc2012-05-21 09:28:20 +10001593 seq_printf(seq, " [%d/%d] [", conf->geo.raid_disks,
1594 conf->geo.raid_disks - mddev->degraded);
1595 for (i = 0; i < conf->geo.raid_disks; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596 seq_printf(seq, "%s",
1597 conf->mirrors[i].rdev &&
NeilBrownb2d444d2005-11-08 21:39:31 -08001598 test_bit(In_sync, &conf->mirrors[i].rdev->flags) ? "U" : "_");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599 seq_printf(seq, "]");
1600}
1601
NeilBrown700c7212011-07-27 11:00:36 +10001602/* check if there are enough drives for
1603 * every block to appear on atleast one.
1604 * Don't consider the device numbered 'ignore'
1605 * as we might be about to remove it.
1606 */
NeilBrown635f6412013-06-11 14:57:09 +10001607static int _enough(struct r10conf *conf, int previous, int ignore)
NeilBrown700c7212011-07-27 11:00:36 +10001608{
1609 int first = 0;
NeilBrown725d6e52013-06-11 15:08:03 +10001610 int has_enough = 0;
NeilBrown635f6412013-06-11 14:57:09 +10001611 int disks, ncopies;
1612 if (previous) {
1613 disks = conf->prev.raid_disks;
1614 ncopies = conf->prev.near_copies;
1615 } else {
1616 disks = conf->geo.raid_disks;
1617 ncopies = conf->geo.near_copies;
1618 }
NeilBrown700c7212011-07-27 11:00:36 +10001619
NeilBrown725d6e52013-06-11 15:08:03 +10001620 rcu_read_lock();
NeilBrown700c7212011-07-27 11:00:36 +10001621 do {
1622 int n = conf->copies;
1623 int cnt = 0;
NeilBrown80b48122012-09-27 12:35:21 +10001624 int this = first;
NeilBrown700c7212011-07-27 11:00:36 +10001625 while (n--) {
NeilBrown725d6e52013-06-11 15:08:03 +10001626 struct md_rdev *rdev;
1627 if (this != ignore &&
1628 (rdev = rcu_dereference(conf->mirrors[this].rdev)) &&
1629 test_bit(In_sync, &rdev->flags))
NeilBrown700c7212011-07-27 11:00:36 +10001630 cnt++;
NeilBrown635f6412013-06-11 14:57:09 +10001631 this = (this+1) % disks;
NeilBrown700c7212011-07-27 11:00:36 +10001632 }
1633 if (cnt == 0)
NeilBrown725d6e52013-06-11 15:08:03 +10001634 goto out;
NeilBrown635f6412013-06-11 14:57:09 +10001635 first = (first + ncopies) % disks;
NeilBrown700c7212011-07-27 11:00:36 +10001636 } while (first != 0);
NeilBrown725d6e52013-06-11 15:08:03 +10001637 has_enough = 1;
1638out:
1639 rcu_read_unlock();
1640 return has_enough;
NeilBrown700c7212011-07-27 11:00:36 +10001641}
1642
NeilBrownf8c9e742012-05-21 09:28:33 +10001643static int enough(struct r10conf *conf, int ignore)
1644{
NeilBrown635f6412013-06-11 14:57:09 +10001645 /* when calling 'enough', both 'prev' and 'geo' must
1646 * be stable.
1647 * This is ensured if ->reconfig_mutex or ->device_lock
1648 * is held.
1649 */
1650 return _enough(conf, 0, ignore) &&
1651 _enough(conf, 1, ignore);
NeilBrownf8c9e742012-05-21 09:28:33 +10001652}
1653
NeilBrownfd01b882011-10-11 16:47:53 +11001654static void error(struct mddev *mddev, struct md_rdev *rdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655{
1656 char b[BDEVNAME_SIZE];
NeilBrowne879a872011-10-11 16:49:02 +11001657 struct r10conf *conf = mddev->private;
NeilBrown635f6412013-06-11 14:57:09 +10001658 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001659
1660 /*
1661 * If it is not operational, then we have already marked it as dead
1662 * else if it is the last working disks, ignore the error, let the
1663 * next level up know.
1664 * else mark the drive as failed
1665 */
NeilBrown635f6412013-06-11 14:57:09 +10001666 spin_lock_irqsave(&conf->device_lock, flags);
NeilBrownb2d444d2005-11-08 21:39:31 -08001667 if (test_bit(In_sync, &rdev->flags)
NeilBrown635f6412013-06-11 14:57:09 +10001668 && !enough(conf, rdev->raid_disk)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669 /*
1670 * Don't fail the drive, just return an IO error.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671 */
NeilBrownc04be0a2006-10-03 01:15:53 -07001672 spin_unlock_irqrestore(&conf->device_lock, flags);
NeilBrown635f6412013-06-11 14:57:09 +10001673 return;
1674 }
NeilBrown2446dba2014-07-31 10:16:29 +10001675 if (test_and_clear_bit(In_sync, &rdev->flags))
NeilBrown635f6412013-06-11 14:57:09 +10001676 mddev->degraded++;
NeilBrown2446dba2014-07-31 10:16:29 +10001677 /*
1678 * If recovery is running, make sure it aborts.
1679 */
1680 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
NeilBrownde393cd2011-07-28 11:31:48 +10001681 set_bit(Blocked, &rdev->flags);
NeilBrownb2d444d2005-11-08 21:39:31 -08001682 set_bit(Faulty, &rdev->flags);
NeilBrown850b2b42006-10-03 01:15:46 -07001683 set_bit(MD_CHANGE_DEVS, &mddev->flags);
NeilBrown635f6412013-06-11 14:57:09 +10001684 spin_unlock_irqrestore(&conf->device_lock, flags);
Joe Perches067032b2011-01-14 09:14:33 +11001685 printk(KERN_ALERT
1686 "md/raid10:%s: Disk failure on %s, disabling device.\n"
1687 "md/raid10:%s: Operation continuing on %d devices.\n",
NeilBrown128595e2010-05-03 14:47:14 +10001688 mdname(mddev), bdevname(rdev->bdev, b),
NeilBrown5cf00fc2012-05-21 09:28:20 +10001689 mdname(mddev), conf->geo.raid_disks - mddev->degraded);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690}
1691
NeilBrowne879a872011-10-11 16:49:02 +11001692static void print_conf(struct r10conf *conf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693{
1694 int i;
Jonathan Brassowdc280d982012-07-31 10:03:52 +10001695 struct raid10_info *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696
NeilBrown128595e2010-05-03 14:47:14 +10001697 printk(KERN_DEBUG "RAID10 conf printout:\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698 if (!conf) {
NeilBrown128595e2010-05-03 14:47:14 +10001699 printk(KERN_DEBUG "(!conf)\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700 return;
1701 }
NeilBrown5cf00fc2012-05-21 09:28:20 +10001702 printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->geo.raid_disks - conf->mddev->degraded,
1703 conf->geo.raid_disks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704
NeilBrown5cf00fc2012-05-21 09:28:20 +10001705 for (i = 0; i < conf->geo.raid_disks; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001706 char b[BDEVNAME_SIZE];
1707 tmp = conf->mirrors + i;
1708 if (tmp->rdev)
NeilBrown128595e2010-05-03 14:47:14 +10001709 printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n",
NeilBrownb2d444d2005-11-08 21:39:31 -08001710 i, !test_bit(In_sync, &tmp->rdev->flags),
1711 !test_bit(Faulty, &tmp->rdev->flags),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712 bdevname(tmp->rdev->bdev,b));
1713 }
1714}
1715
NeilBrowne879a872011-10-11 16:49:02 +11001716static void close_sync(struct r10conf *conf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001717{
NeilBrown0a27ec92006-01-06 00:20:13 -08001718 wait_barrier(conf);
1719 allow_barrier(conf);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720
1721 mempool_destroy(conf->r10buf_pool);
1722 conf->r10buf_pool = NULL;
1723}
1724
NeilBrownfd01b882011-10-11 16:47:53 +11001725static int raid10_spare_active(struct mddev *mddev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001726{
1727 int i;
NeilBrowne879a872011-10-11 16:49:02 +11001728 struct r10conf *conf = mddev->private;
Jonathan Brassowdc280d982012-07-31 10:03:52 +10001729 struct raid10_info *tmp;
NeilBrown6b965622010-08-18 11:56:59 +10001730 int count = 0;
1731 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001732
1733 /*
1734 * Find all non-in_sync disks within the RAID10 configuration
1735 * and mark them in_sync
1736 */
NeilBrown5cf00fc2012-05-21 09:28:20 +10001737 for (i = 0; i < conf->geo.raid_disks; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738 tmp = conf->mirrors + i;
NeilBrown4ca40c22011-12-23 10:17:55 +11001739 if (tmp->replacement
1740 && tmp->replacement->recovery_offset == MaxSector
1741 && !test_bit(Faulty, &tmp->replacement->flags)
1742 && !test_and_set_bit(In_sync, &tmp->replacement->flags)) {
1743 /* Replacement has just become active */
1744 if (!tmp->rdev
1745 || !test_and_clear_bit(In_sync, &tmp->rdev->flags))
1746 count++;
1747 if (tmp->rdev) {
1748 /* Replaced device not technically faulty,
1749 * but we need to be sure it gets removed
1750 * and never re-added.
1751 */
1752 set_bit(Faulty, &tmp->rdev->flags);
1753 sysfs_notify_dirent_safe(
1754 tmp->rdev->sysfs_state);
1755 }
1756 sysfs_notify_dirent_safe(tmp->replacement->sysfs_state);
1757 } else if (tmp->rdev
Lukasz Dorau61e49472013-10-24 12:55:17 +11001758 && tmp->rdev->recovery_offset == MaxSector
NeilBrown4ca40c22011-12-23 10:17:55 +11001759 && !test_bit(Faulty, &tmp->rdev->flags)
1760 && !test_and_set_bit(In_sync, &tmp->rdev->flags)) {
NeilBrown6b965622010-08-18 11:56:59 +10001761 count++;
Jonathan Brassow2863b9e2012-10-11 13:38:58 +11001762 sysfs_notify_dirent_safe(tmp->rdev->sysfs_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001763 }
1764 }
NeilBrown6b965622010-08-18 11:56:59 +10001765 spin_lock_irqsave(&conf->device_lock, flags);
1766 mddev->degraded -= count;
1767 spin_unlock_irqrestore(&conf->device_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768
1769 print_conf(conf);
NeilBrown6b965622010-08-18 11:56:59 +10001770 return count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771}
1772
NeilBrownfd01b882011-10-11 16:47:53 +11001773static int raid10_add_disk(struct mddev *mddev, struct md_rdev *rdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001774{
NeilBrowne879a872011-10-11 16:49:02 +11001775 struct r10conf *conf = mddev->private;
Neil Brown199050e2008-06-28 08:31:33 +10001776 int err = -EEXIST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777 int mirror;
Neil Brown6c2fce22008-06-28 08:31:31 +10001778 int first = 0;
NeilBrown5cf00fc2012-05-21 09:28:20 +10001779 int last = conf->geo.raid_disks - 1;
NeilBrown050b6612012-03-19 12:46:39 +11001780 struct request_queue *q = bdev_get_queue(rdev->bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781
1782 if (mddev->recovery_cp < MaxSector)
1783 /* only hot-add to in-sync arrays, as recovery is
1784 * very different from resync
1785 */
Neil Brown199050e2008-06-28 08:31:33 +10001786 return -EBUSY;
NeilBrown635f6412013-06-11 14:57:09 +10001787 if (rdev->saved_raid_disk < 0 && !_enough(conf, 1, -1))
Neil Brown199050e2008-06-28 08:31:33 +10001788 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789
NeilBrowna53a6c82008-11-06 17:28:20 +11001790 if (rdev->raid_disk >= 0)
Neil Brown6c2fce22008-06-28 08:31:31 +10001791 first = last = rdev->raid_disk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001792
NeilBrown050b6612012-03-19 12:46:39 +11001793 if (q->merge_bvec_fn) {
1794 set_bit(Unmerged, &rdev->flags);
1795 mddev->merge_check_needed = 1;
1796 }
1797
Namhyung Kim2c4193d2011-07-18 17:38:43 +10001798 if (rdev->saved_raid_disk >= first &&
NeilBrown6cce3b232006-01-06 00:20:16 -08001799 conf->mirrors[rdev->saved_raid_disk].rdev == NULL)
1800 mirror = rdev->saved_raid_disk;
1801 else
Neil Brown6c2fce22008-06-28 08:31:31 +10001802 mirror = first;
NeilBrown2bb77732011-07-27 11:00:36 +10001803 for ( ; mirror <= last ; mirror++) {
Jonathan Brassowdc280d982012-07-31 10:03:52 +10001804 struct raid10_info *p = &conf->mirrors[mirror];
NeilBrown2bb77732011-07-27 11:00:36 +10001805 if (p->recovery_disabled == mddev->recovery_disabled)
1806 continue;
NeilBrownb7044d42011-12-23 10:17:56 +11001807 if (p->rdev) {
1808 if (!test_bit(WantReplacement, &p->rdev->flags) ||
1809 p->replacement != NULL)
1810 continue;
1811 clear_bit(In_sync, &rdev->flags);
1812 set_bit(Replacement, &rdev->flags);
1813 rdev->raid_disk = mirror;
1814 err = 0;
Jonathan Brassow9092c022013-05-02 14:19:24 -05001815 if (mddev->gendisk)
1816 disk_stack_limits(mddev->gendisk, rdev->bdev,
1817 rdev->data_offset << 9);
NeilBrownb7044d42011-12-23 10:17:56 +11001818 conf->fullsync = 1;
1819 rcu_assign_pointer(p->replacement, rdev);
1820 break;
1821 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822
Jonathan Brassow9092c022013-05-02 14:19:24 -05001823 if (mddev->gendisk)
1824 disk_stack_limits(mddev->gendisk, rdev->bdev,
1825 rdev->data_offset << 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001826
NeilBrown2bb77732011-07-27 11:00:36 +10001827 p->head_position = 0;
NeilBrownd890fa22011-10-26 11:54:39 +11001828 p->recovery_disabled = mddev->recovery_disabled - 1;
NeilBrown2bb77732011-07-27 11:00:36 +10001829 rdev->raid_disk = mirror;
1830 err = 0;
1831 if (rdev->saved_raid_disk != mirror)
1832 conf->fullsync = 1;
1833 rcu_assign_pointer(p->rdev, rdev);
1834 break;
1835 }
NeilBrown050b6612012-03-19 12:46:39 +11001836 if (err == 0 && test_bit(Unmerged, &rdev->flags)) {
1837 /* Some requests might not have seen this new
1838 * merge_bvec_fn. We must wait for them to complete
1839 * before merging the device fully.
1840 * First we make sure any code which has tested
1841 * our function has submitted the request, then
1842 * we wait for all outstanding requests to complete.
1843 */
1844 synchronize_sched();
NeilBrowne2d59922013-06-12 11:01:22 +10001845 freeze_array(conf, 0);
1846 unfreeze_array(conf);
NeilBrown050b6612012-03-19 12:46:39 +11001847 clear_bit(Unmerged, &rdev->flags);
1848 }
Andre Nollac5e7112009-08-03 10:59:47 +10001849 md_integrity_add_rdev(rdev, mddev);
Jonathan Brassowed30be02012-10-31 11:42:30 +11001850 if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev)))
Shaohua Li532a2a32012-10-11 13:30:52 +11001851 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
1852
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853 print_conf(conf);
Neil Brown199050e2008-06-28 08:31:33 +10001854 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001855}
1856
NeilBrownb8321b62011-12-23 10:17:51 +11001857static int raid10_remove_disk(struct mddev *mddev, struct md_rdev *rdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001858{
NeilBrowne879a872011-10-11 16:49:02 +11001859 struct r10conf *conf = mddev->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860 int err = 0;
NeilBrownb8321b62011-12-23 10:17:51 +11001861 int number = rdev->raid_disk;
NeilBrownc8ab9032011-12-23 10:17:54 +11001862 struct md_rdev **rdevp;
Jonathan Brassowdc280d982012-07-31 10:03:52 +10001863 struct raid10_info *p = conf->mirrors + number;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001864
1865 print_conf(conf);
NeilBrownc8ab9032011-12-23 10:17:54 +11001866 if (rdev == p->rdev)
1867 rdevp = &p->rdev;
1868 else if (rdev == p->replacement)
1869 rdevp = &p->replacement;
1870 else
1871 return 0;
1872
1873 if (test_bit(In_sync, &rdev->flags) ||
1874 atomic_read(&rdev->nr_pending)) {
1875 err = -EBUSY;
1876 goto abort;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001877 }
NeilBrownc8ab9032011-12-23 10:17:54 +11001878 /* Only remove faulty devices if recovery
1879 * is not possible.
1880 */
1881 if (!test_bit(Faulty, &rdev->flags) &&
1882 mddev->recovery_disabled != p->recovery_disabled &&
NeilBrown4ca40c22011-12-23 10:17:55 +11001883 (!p->replacement || p->replacement == rdev) &&
NeilBrown63aced62012-05-22 13:55:33 +10001884 number < conf->geo.raid_disks &&
NeilBrownc8ab9032011-12-23 10:17:54 +11001885 enough(conf, -1)) {
1886 err = -EBUSY;
1887 goto abort;
1888 }
1889 *rdevp = NULL;
1890 synchronize_rcu();
1891 if (atomic_read(&rdev->nr_pending)) {
1892 /* lost the race, try later */
1893 err = -EBUSY;
1894 *rdevp = rdev;
1895 goto abort;
NeilBrown4ca40c22011-12-23 10:17:55 +11001896 } else if (p->replacement) {
1897 /* We must have just cleared 'rdev' */
1898 p->rdev = p->replacement;
1899 clear_bit(Replacement, &p->replacement->flags);
1900 smp_mb(); /* Make sure other CPUs may see both as identical
1901 * but will never see neither -- if they are careful.
1902 */
1903 p->replacement = NULL;
1904 clear_bit(WantReplacement, &rdev->flags);
1905 } else
1906 /* We might have just remove the Replacement as faulty
1907 * Clear the flag just in case
1908 */
1909 clear_bit(WantReplacement, &rdev->flags);
1910
NeilBrownc8ab9032011-12-23 10:17:54 +11001911 err = md_integrity_register(mddev);
1912
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913abort:
1914
1915 print_conf(conf);
1916 return err;
1917}
1918
NeilBrown6712ecf2007-09-27 12:47:43 +02001919static void end_sync_read(struct bio *bio, int error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001920{
NeilBrown9f2c9d12011-10-11 16:48:43 +11001921 struct r10bio *r10_bio = bio->bi_private;
NeilBrowne879a872011-10-11 16:49:02 +11001922 struct r10conf *conf = r10_bio->mddev->private;
Namhyung Kim778ca012011-07-18 17:38:47 +10001923 int d;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924
NeilBrown3ea7daa2012-05-22 13:53:47 +10001925 if (bio == r10_bio->master_bio) {
1926 /* this is a reshape read */
1927 d = r10_bio->read_slot; /* really the read dev */
1928 } else
1929 d = find_bio_disk(conf, r10_bio, bio, NULL, NULL);
NeilBrown0eb3ff12006-01-06 00:20:29 -08001930
1931 if (test_bit(BIO_UPTODATE, &bio->bi_flags))
1932 set_bit(R10BIO_Uptodate, &r10_bio->state);
NeilBrowne684e412011-07-28 11:39:25 +10001933 else
1934 /* The write handler will notice the lack of
1935 * R10BIO_Uptodate and record any errors etc
1936 */
NeilBrown4dbcdc72006-01-06 00:20:52 -08001937 atomic_add(r10_bio->sectors,
1938 &conf->mirrors[d].rdev->corrected_errors);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939
1940 /* for reconstruct, we always reschedule after a read.
1941 * for resync, only after all reads
1942 */
NeilBrown73d5c382009-02-25 13:18:47 +11001943 rdev_dec_pending(conf->mirrors[d].rdev, conf->mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944 if (test_bit(R10BIO_IsRecover, &r10_bio->state) ||
1945 atomic_dec_and_test(&r10_bio->remaining)) {
1946 /* we have read all the blocks,
1947 * do the comparison in process context in raid10d
1948 */
1949 reschedule_retry(r10_bio);
1950 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001951}
1952
NeilBrown9f2c9d12011-10-11 16:48:43 +11001953static void end_sync_request(struct r10bio *r10_bio)
NeilBrown5e570282011-07-28 11:39:25 +10001954{
NeilBrownfd01b882011-10-11 16:47:53 +11001955 struct mddev *mddev = r10_bio->mddev;
NeilBrown5e570282011-07-28 11:39:25 +10001956
1957 while (atomic_dec_and_test(&r10_bio->remaining)) {
1958 if (r10_bio->master_bio == NULL) {
1959 /* the primary of several recovery bios */
1960 sector_t s = r10_bio->sectors;
1961 if (test_bit(R10BIO_MadeGood, &r10_bio->state) ||
1962 test_bit(R10BIO_WriteError, &r10_bio->state))
1963 reschedule_retry(r10_bio);
1964 else
1965 put_buf(r10_bio);
1966 md_done_sync(mddev, s, 1);
1967 break;
1968 } else {
NeilBrown9f2c9d12011-10-11 16:48:43 +11001969 struct r10bio *r10_bio2 = (struct r10bio *)r10_bio->master_bio;
NeilBrown5e570282011-07-28 11:39:25 +10001970 if (test_bit(R10BIO_MadeGood, &r10_bio->state) ||
1971 test_bit(R10BIO_WriteError, &r10_bio->state))
1972 reschedule_retry(r10_bio);
1973 else
1974 put_buf(r10_bio);
1975 r10_bio = r10_bio2;
1976 }
1977 }
1978}
1979
NeilBrown6712ecf2007-09-27 12:47:43 +02001980static void end_sync_write(struct bio *bio, int error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001981{
1982 int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
NeilBrown9f2c9d12011-10-11 16:48:43 +11001983 struct r10bio *r10_bio = bio->bi_private;
NeilBrownfd01b882011-10-11 16:47:53 +11001984 struct mddev *mddev = r10_bio->mddev;
NeilBrowne879a872011-10-11 16:49:02 +11001985 struct r10conf *conf = mddev->private;
Namhyung Kim778ca012011-07-18 17:38:47 +10001986 int d;
NeilBrown749c55e2011-07-28 11:39:24 +10001987 sector_t first_bad;
1988 int bad_sectors;
1989 int slot;
NeilBrown9ad1aef2011-12-23 10:17:55 +11001990 int repl;
NeilBrown4ca40c22011-12-23 10:17:55 +11001991 struct md_rdev *rdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001992
NeilBrown9ad1aef2011-12-23 10:17:55 +11001993 d = find_bio_disk(conf, r10_bio, bio, &slot, &repl);
1994 if (repl)
1995 rdev = conf->mirrors[d].replacement;
NeilBrown547414d2012-03-13 11:21:20 +11001996 else
NeilBrown9ad1aef2011-12-23 10:17:55 +11001997 rdev = conf->mirrors[d].rdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001998
NeilBrown1a0b7cd2011-07-28 11:39:25 +10001999 if (!uptodate) {
NeilBrown9ad1aef2011-12-23 10:17:55 +11002000 if (repl)
2001 md_error(mddev, rdev);
2002 else {
2003 set_bit(WriteErrorSeen, &rdev->flags);
NeilBrownb7044d42011-12-23 10:17:56 +11002004 if (!test_and_set_bit(WantReplacement, &rdev->flags))
2005 set_bit(MD_RECOVERY_NEEDED,
2006 &rdev->mddev->recovery);
NeilBrown9ad1aef2011-12-23 10:17:55 +11002007 set_bit(R10BIO_WriteError, &r10_bio->state);
2008 }
2009 } else if (is_badblock(rdev,
NeilBrown749c55e2011-07-28 11:39:24 +10002010 r10_bio->devs[slot].addr,
2011 r10_bio->sectors,
2012 &first_bad, &bad_sectors))
2013 set_bit(R10BIO_MadeGood, &r10_bio->state);
NeilBrowndfc70642008-05-23 13:04:39 -07002014
NeilBrown9ad1aef2011-12-23 10:17:55 +11002015 rdev_dec_pending(rdev, mddev);
NeilBrown5e570282011-07-28 11:39:25 +10002016
2017 end_sync_request(r10_bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002018}
2019
2020/*
2021 * Note: sync and recover and handled very differently for raid10
2022 * This code is for resync.
2023 * For resync, we read through virtual addresses and read all blocks.
2024 * If there is any error, we schedule a write. The lowest numbered
2025 * drive is authoritative.
2026 * However requests come for physical address, so we need to map.
2027 * For every physical address there are raid_disks/copies virtual addresses,
2028 * which is always are least one, but is not necessarly an integer.
2029 * This means that a physical address can span multiple chunks, so we may
2030 * have to submit multiple io requests for a single sync request.
2031 */
2032/*
2033 * We check if all blocks are in-sync and only write to blocks that
2034 * aren't in sync
2035 */
NeilBrown9f2c9d12011-10-11 16:48:43 +11002036static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002037{
NeilBrowne879a872011-10-11 16:49:02 +11002038 struct r10conf *conf = mddev->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002039 int i, first;
2040 struct bio *tbio, *fbio;
majianpengf4380a92012-04-12 16:04:47 +10002041 int vcnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002042
2043 atomic_set(&r10_bio->remaining, 1);
2044
2045 /* find the first device with a block */
2046 for (i=0; i<conf->copies; i++)
2047 if (test_bit(BIO_UPTODATE, &r10_bio->devs[i].bio->bi_flags))
2048 break;
2049
2050 if (i == conf->copies)
2051 goto done;
2052
2053 first = i;
2054 fbio = r10_bio->devs[i].bio;
2055
majianpengf4380a92012-04-12 16:04:47 +10002056 vcnt = (r10_bio->sectors + (PAGE_SIZE >> 9) - 1) >> (PAGE_SHIFT - 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002057 /* now find blocks with errors */
NeilBrown0eb3ff12006-01-06 00:20:29 -08002058 for (i=0 ; i < conf->copies ; i++) {
2059 int j, d;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002060
Linus Torvalds1da177e2005-04-16 15:20:36 -07002061 tbio = r10_bio->devs[i].bio;
NeilBrown0eb3ff12006-01-06 00:20:29 -08002062
2063 if (tbio->bi_end_io != end_sync_read)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002064 continue;
NeilBrown0eb3ff12006-01-06 00:20:29 -08002065 if (i == first)
2066 continue;
2067 if (test_bit(BIO_UPTODATE, &r10_bio->devs[i].bio->bi_flags)) {
2068 /* We know that the bi_io_vec layout is the same for
2069 * both 'first' and 'i', so we just compare them.
2070 * All vec entries are PAGE_SIZE;
2071 */
NeilBrown7bb23c42013-07-16 16:50:47 +10002072 int sectors = r10_bio->sectors;
2073 for (j = 0; j < vcnt; j++) {
2074 int len = PAGE_SIZE;
2075 if (sectors < (len / 512))
2076 len = sectors * 512;
NeilBrown0eb3ff12006-01-06 00:20:29 -08002077 if (memcmp(page_address(fbio->bi_io_vec[j].bv_page),
2078 page_address(tbio->bi_io_vec[j].bv_page),
NeilBrown7bb23c42013-07-16 16:50:47 +10002079 len))
NeilBrown0eb3ff12006-01-06 00:20:29 -08002080 break;
NeilBrown7bb23c42013-07-16 16:50:47 +10002081 sectors -= len/512;
2082 }
NeilBrown0eb3ff12006-01-06 00:20:29 -08002083 if (j == vcnt)
2084 continue;
Jianpeng Ma7f7583d2012-10-11 14:17:59 +11002085 atomic64_add(r10_bio->sectors, &mddev->resync_mismatches);
NeilBrownf84ee362011-07-28 11:39:25 +10002086 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2087 /* Don't fix anything. */
2088 continue;
NeilBrown0eb3ff12006-01-06 00:20:29 -08002089 }
NeilBrownf84ee362011-07-28 11:39:25 +10002090 /* Ok, we need to write this bio, either to correct an
2091 * inconsistency or to correct an unreadable block.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002092 * First we need to fixup bv_offset, bv_len and
2093 * bi_vecs, as the read request might have corrupted these
2094 */
Kent Overstreet8be185f2012-09-06 14:14:43 -07002095 bio_reset(tbio);
2096
Linus Torvalds1da177e2005-04-16 15:20:36 -07002097 tbio->bi_vcnt = vcnt;
Kent Overstreet4f024f32013-10-11 15:44:27 -07002098 tbio->bi_iter.bi_size = r10_bio->sectors << 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002099 tbio->bi_rw = WRITE;
2100 tbio->bi_private = r10_bio;
Kent Overstreet4f024f32013-10-11 15:44:27 -07002101 tbio->bi_iter.bi_sector = r10_bio->devs[i].addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102
2103 for (j=0; j < vcnt ; j++) {
2104 tbio->bi_io_vec[j].bv_offset = 0;
2105 tbio->bi_io_vec[j].bv_len = PAGE_SIZE;
2106
2107 memcpy(page_address(tbio->bi_io_vec[j].bv_page),
2108 page_address(fbio->bi_io_vec[j].bv_page),
2109 PAGE_SIZE);
2110 }
2111 tbio->bi_end_io = end_sync_write;
2112
2113 d = r10_bio->devs[i].devnum;
2114 atomic_inc(&conf->mirrors[d].rdev->nr_pending);
2115 atomic_inc(&r10_bio->remaining);
Kent Overstreetaa8b57a2013-02-05 15:19:29 -08002116 md_sync_acct(conf->mirrors[d].rdev->bdev, bio_sectors(tbio));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002117
Kent Overstreet4f024f32013-10-11 15:44:27 -07002118 tbio->bi_iter.bi_sector += conf->mirrors[d].rdev->data_offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002119 tbio->bi_bdev = conf->mirrors[d].rdev->bdev;
2120 generic_make_request(tbio);
2121 }
2122
NeilBrown9ad1aef2011-12-23 10:17:55 +11002123 /* Now write out to any replacement devices
2124 * that are active
2125 */
2126 for (i = 0; i < conf->copies; i++) {
2127 int j, d;
NeilBrown9ad1aef2011-12-23 10:17:55 +11002128
2129 tbio = r10_bio->devs[i].repl_bio;
2130 if (!tbio || !tbio->bi_end_io)
2131 continue;
2132 if (r10_bio->devs[i].bio->bi_end_io != end_sync_write
2133 && r10_bio->devs[i].bio != fbio)
2134 for (j = 0; j < vcnt; j++)
2135 memcpy(page_address(tbio->bi_io_vec[j].bv_page),
2136 page_address(fbio->bi_io_vec[j].bv_page),
2137 PAGE_SIZE);
2138 d = r10_bio->devs[i].devnum;
2139 atomic_inc(&r10_bio->remaining);
2140 md_sync_acct(conf->mirrors[d].replacement->bdev,
Kent Overstreetaa8b57a2013-02-05 15:19:29 -08002141 bio_sectors(tbio));
NeilBrown9ad1aef2011-12-23 10:17:55 +11002142 generic_make_request(tbio);
2143 }
2144
Linus Torvalds1da177e2005-04-16 15:20:36 -07002145done:
2146 if (atomic_dec_and_test(&r10_bio->remaining)) {
2147 md_done_sync(mddev, r10_bio->sectors, 1);
2148 put_buf(r10_bio);
2149 }
2150}
2151
2152/*
2153 * Now for the recovery code.
2154 * Recovery happens across physical sectors.
2155 * We recover all non-is_sync drives by finding the virtual address of
2156 * each, and then choose a working drive that also has that virt address.
2157 * There is a separate r10_bio for each non-in_sync drive.
2158 * Only the first two slots are in use. The first for reading,
2159 * The second for writing.
2160 *
2161 */
NeilBrown9f2c9d12011-10-11 16:48:43 +11002162static void fix_recovery_read_error(struct r10bio *r10_bio)
NeilBrown5e570282011-07-28 11:39:25 +10002163{
2164 /* We got a read error during recovery.
2165 * We repeat the read in smaller page-sized sections.
2166 * If a read succeeds, write it to the new device or record
2167 * a bad block if we cannot.
2168 * If a read fails, record a bad block on both old and
2169 * new devices.
2170 */
NeilBrownfd01b882011-10-11 16:47:53 +11002171 struct mddev *mddev = r10_bio->mddev;
NeilBrowne879a872011-10-11 16:49:02 +11002172 struct r10conf *conf = mddev->private;
NeilBrown5e570282011-07-28 11:39:25 +10002173 struct bio *bio = r10_bio->devs[0].bio;
2174 sector_t sect = 0;
2175 int sectors = r10_bio->sectors;
2176 int idx = 0;
2177 int dr = r10_bio->devs[0].devnum;
2178 int dw = r10_bio->devs[1].devnum;
2179
2180 while (sectors) {
2181 int s = sectors;
NeilBrown3cb03002011-10-11 16:45:26 +11002182 struct md_rdev *rdev;
NeilBrown5e570282011-07-28 11:39:25 +10002183 sector_t addr;
2184 int ok;
2185
2186 if (s > (PAGE_SIZE>>9))
2187 s = PAGE_SIZE >> 9;
2188
2189 rdev = conf->mirrors[dr].rdev;
2190 addr = r10_bio->devs[0].addr + sect,
2191 ok = sync_page_io(rdev,
2192 addr,
2193 s << 9,
2194 bio->bi_io_vec[idx].bv_page,
2195 READ, false);
2196 if (ok) {
2197 rdev = conf->mirrors[dw].rdev;
2198 addr = r10_bio->devs[1].addr + sect;
2199 ok = sync_page_io(rdev,
2200 addr,
2201 s << 9,
2202 bio->bi_io_vec[idx].bv_page,
2203 WRITE, false);
NeilBrownb7044d42011-12-23 10:17:56 +11002204 if (!ok) {
NeilBrown5e570282011-07-28 11:39:25 +10002205 set_bit(WriteErrorSeen, &rdev->flags);
NeilBrownb7044d42011-12-23 10:17:56 +11002206 if (!test_and_set_bit(WantReplacement,
2207 &rdev->flags))
2208 set_bit(MD_RECOVERY_NEEDED,
2209 &rdev->mddev->recovery);
2210 }
NeilBrown5e570282011-07-28 11:39:25 +10002211 }
2212 if (!ok) {
2213 /* We don't worry if we cannot set a bad block -
2214 * it really is bad so there is no loss in not
2215 * recording it yet
2216 */
2217 rdev_set_badblocks(rdev, addr, s, 0);
2218
2219 if (rdev != conf->mirrors[dw].rdev) {
2220 /* need bad block on destination too */
NeilBrown3cb03002011-10-11 16:45:26 +11002221 struct md_rdev *rdev2 = conf->mirrors[dw].rdev;
NeilBrown5e570282011-07-28 11:39:25 +10002222 addr = r10_bio->devs[1].addr + sect;
2223 ok = rdev_set_badblocks(rdev2, addr, s, 0);
2224 if (!ok) {
2225 /* just abort the recovery */
2226 printk(KERN_NOTICE
2227 "md/raid10:%s: recovery aborted"
2228 " due to read error\n",
2229 mdname(mddev));
2230
2231 conf->mirrors[dw].recovery_disabled
2232 = mddev->recovery_disabled;
2233 set_bit(MD_RECOVERY_INTR,
2234 &mddev->recovery);
2235 break;
2236 }
2237 }
2238 }
2239
2240 sectors -= s;
2241 sect += s;
2242 idx++;
2243 }
2244}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002245
NeilBrown9f2c9d12011-10-11 16:48:43 +11002246static void recovery_request_write(struct mddev *mddev, struct r10bio *r10_bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002247{
NeilBrowne879a872011-10-11 16:49:02 +11002248 struct r10conf *conf = mddev->private;
Namhyung Kimc65060a2011-07-18 17:38:49 +10002249 int d;
NeilBrown24afd802011-12-23 10:17:55 +11002250 struct bio *wbio, *wbio2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002251
NeilBrown5e570282011-07-28 11:39:25 +10002252 if (!test_bit(R10BIO_Uptodate, &r10_bio->state)) {
2253 fix_recovery_read_error(r10_bio);
2254 end_sync_request(r10_bio);
2255 return;
2256 }
2257
Namhyung Kimc65060a2011-07-18 17:38:49 +10002258 /*
2259 * share the pages with the first bio
Linus Torvalds1da177e2005-04-16 15:20:36 -07002260 * and submit the write request
2261 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002262 d = r10_bio->devs[1].devnum;
NeilBrown24afd802011-12-23 10:17:55 +11002263 wbio = r10_bio->devs[1].bio;
2264 wbio2 = r10_bio->devs[1].repl_bio;
NeilBrown0eb25bb2013-07-24 15:37:42 +10002265 /* Need to test wbio2->bi_end_io before we call
2266 * generic_make_request as if the former is NULL,
2267 * the latter is free to free wbio2.
2268 */
2269 if (wbio2 && !wbio2->bi_end_io)
2270 wbio2 = NULL;
NeilBrown24afd802011-12-23 10:17:55 +11002271 if (wbio->bi_end_io) {
2272 atomic_inc(&conf->mirrors[d].rdev->nr_pending);
Kent Overstreetaa8b57a2013-02-05 15:19:29 -08002273 md_sync_acct(conf->mirrors[d].rdev->bdev, bio_sectors(wbio));
NeilBrown24afd802011-12-23 10:17:55 +11002274 generic_make_request(wbio);
2275 }
NeilBrown0eb25bb2013-07-24 15:37:42 +10002276 if (wbio2) {
NeilBrown24afd802011-12-23 10:17:55 +11002277 atomic_inc(&conf->mirrors[d].replacement->nr_pending);
2278 md_sync_acct(conf->mirrors[d].replacement->bdev,
Kent Overstreetaa8b57a2013-02-05 15:19:29 -08002279 bio_sectors(wbio2));
NeilBrown24afd802011-12-23 10:17:55 +11002280 generic_make_request(wbio2);
2281 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002282}
2283
Linus Torvalds1da177e2005-04-16 15:20:36 -07002284/*
Robert Becker1e509152009-12-14 12:49:58 +11002285 * Used by fix_read_error() to decay the per rdev read_errors.
2286 * We halve the read error count for every hour that has elapsed
2287 * since the last recorded read error.
2288 *
2289 */
NeilBrownfd01b882011-10-11 16:47:53 +11002290static void check_decay_read_errors(struct mddev *mddev, struct md_rdev *rdev)
Robert Becker1e509152009-12-14 12:49:58 +11002291{
2292 struct timespec cur_time_mon;
2293 unsigned long hours_since_last;
2294 unsigned int read_errors = atomic_read(&rdev->read_errors);
2295
2296 ktime_get_ts(&cur_time_mon);
2297
2298 if (rdev->last_read_error.tv_sec == 0 &&
2299 rdev->last_read_error.tv_nsec == 0) {
2300 /* first time we've seen a read error */
2301 rdev->last_read_error = cur_time_mon;
2302 return;
2303 }
2304
2305 hours_since_last = (cur_time_mon.tv_sec -
2306 rdev->last_read_error.tv_sec) / 3600;
2307
2308 rdev->last_read_error = cur_time_mon;
2309
2310 /*
2311 * if hours_since_last is > the number of bits in read_errors
2312 * just set read errors to 0. We do this to avoid
2313 * overflowing the shift of read_errors by hours_since_last.
2314 */
2315 if (hours_since_last >= 8 * sizeof(read_errors))
2316 atomic_set(&rdev->read_errors, 0);
2317 else
2318 atomic_set(&rdev->read_errors, read_errors >> hours_since_last);
2319}
2320
NeilBrown3cb03002011-10-11 16:45:26 +11002321static int r10_sync_page_io(struct md_rdev *rdev, sector_t sector,
NeilBrown58c54fc2011-07-28 11:39:25 +10002322 int sectors, struct page *page, int rw)
2323{
2324 sector_t first_bad;
2325 int bad_sectors;
2326
2327 if (is_badblock(rdev, sector, sectors, &first_bad, &bad_sectors)
2328 && (rw == READ || test_bit(WriteErrorSeen, &rdev->flags)))
2329 return -1;
2330 if (sync_page_io(rdev, sector, sectors << 9, page, rw, false))
2331 /* success */
2332 return 1;
NeilBrownb7044d42011-12-23 10:17:56 +11002333 if (rw == WRITE) {
NeilBrown58c54fc2011-07-28 11:39:25 +10002334 set_bit(WriteErrorSeen, &rdev->flags);
NeilBrownb7044d42011-12-23 10:17:56 +11002335 if (!test_and_set_bit(WantReplacement, &rdev->flags))
2336 set_bit(MD_RECOVERY_NEEDED,
2337 &rdev->mddev->recovery);
2338 }
NeilBrown58c54fc2011-07-28 11:39:25 +10002339 /* need to record an error - either for the block or the device */
2340 if (!rdev_set_badblocks(rdev, sector, sectors, 0))
2341 md_error(rdev->mddev, rdev);
2342 return 0;
2343}
2344
Robert Becker1e509152009-12-14 12:49:58 +11002345/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002346 * This is a kernel thread which:
2347 *
2348 * 1. Retries failed read operations on working mirrors.
2349 * 2. Updates the raid superblock when problems encounter.
NeilBrown6814d532006-10-03 01:15:45 -07002350 * 3. Performs writes following reads for array synchronising.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002351 */
2352
NeilBrowne879a872011-10-11 16:49:02 +11002353static void fix_read_error(struct r10conf *conf, struct mddev *mddev, struct r10bio *r10_bio)
NeilBrown6814d532006-10-03 01:15:45 -07002354{
2355 int sect = 0; /* Offset from r10_bio->sector */
2356 int sectors = r10_bio->sectors;
NeilBrown3cb03002011-10-11 16:45:26 +11002357 struct md_rdev*rdev;
Robert Becker1e509152009-12-14 12:49:58 +11002358 int max_read_errors = atomic_read(&mddev->max_corr_read_errors);
Prasanna S. Panchamukhi0544a212010-06-24 13:31:03 +10002359 int d = r10_bio->devs[r10_bio->read_slot].devnum;
Robert Becker1e509152009-12-14 12:49:58 +11002360
NeilBrown7c4e06f2011-05-11 14:53:17 +10002361 /* still own a reference to this rdev, so it cannot
2362 * have been cleared recently.
2363 */
2364 rdev = conf->mirrors[d].rdev;
Robert Becker1e509152009-12-14 12:49:58 +11002365
NeilBrown7c4e06f2011-05-11 14:53:17 +10002366 if (test_bit(Faulty, &rdev->flags))
2367 /* drive has already been failed, just ignore any
2368 more fix_read_error() attempts */
2369 return;
2370
2371 check_decay_read_errors(mddev, rdev);
2372 atomic_inc(&rdev->read_errors);
2373 if (atomic_read(&rdev->read_errors) > max_read_errors) {
2374 char b[BDEVNAME_SIZE];
Robert Becker1e509152009-12-14 12:49:58 +11002375 bdevname(rdev->bdev, b);
2376
NeilBrown7c4e06f2011-05-11 14:53:17 +10002377 printk(KERN_NOTICE
2378 "md/raid10:%s: %s: Raid device exceeded "
2379 "read_error threshold [cur %d:max %d]\n",
2380 mdname(mddev), b,
2381 atomic_read(&rdev->read_errors), max_read_errors);
2382 printk(KERN_NOTICE
2383 "md/raid10:%s: %s: Failing raid device\n",
2384 mdname(mddev), b);
2385 md_error(mddev, conf->mirrors[d].rdev);
NeilBrownfae8cc52012-02-14 11:10:10 +11002386 r10_bio->devs[r10_bio->read_slot].bio = IO_BLOCKED;
NeilBrown7c4e06f2011-05-11 14:53:17 +10002387 return;
Robert Becker1e509152009-12-14 12:49:58 +11002388 }
Robert Becker1e509152009-12-14 12:49:58 +11002389
NeilBrown6814d532006-10-03 01:15:45 -07002390 while(sectors) {
2391 int s = sectors;
2392 int sl = r10_bio->read_slot;
2393 int success = 0;
2394 int start;
2395
2396 if (s > (PAGE_SIZE>>9))
2397 s = PAGE_SIZE >> 9;
2398
2399 rcu_read_lock();
2400 do {
NeilBrown8dbed5c2011-07-28 11:39:24 +10002401 sector_t first_bad;
2402 int bad_sectors;
2403
Prasanna S. Panchamukhi0544a212010-06-24 13:31:03 +10002404 d = r10_bio->devs[sl].devnum;
NeilBrown6814d532006-10-03 01:15:45 -07002405 rdev = rcu_dereference(conf->mirrors[d].rdev);
2406 if (rdev &&
NeilBrown050b6612012-03-19 12:46:39 +11002407 !test_bit(Unmerged, &rdev->flags) &&
NeilBrown8dbed5c2011-07-28 11:39:24 +10002408 test_bit(In_sync, &rdev->flags) &&
2409 is_badblock(rdev, r10_bio->devs[sl].addr + sect, s,
2410 &first_bad, &bad_sectors) == 0) {
NeilBrown6814d532006-10-03 01:15:45 -07002411 atomic_inc(&rdev->nr_pending);
2412 rcu_read_unlock();
NeilBrown2b193362010-10-27 15:16:40 +11002413 success = sync_page_io(rdev,
NeilBrown6814d532006-10-03 01:15:45 -07002414 r10_bio->devs[sl].addr +
Jonathan Brassowccebd4c2011-01-14 09:14:33 +11002415 sect,
NeilBrown6814d532006-10-03 01:15:45 -07002416 s<<9,
Jonathan Brassowccebd4c2011-01-14 09:14:33 +11002417 conf->tmppage, READ, false);
NeilBrown6814d532006-10-03 01:15:45 -07002418 rdev_dec_pending(rdev, mddev);
2419 rcu_read_lock();
2420 if (success)
2421 break;
2422 }
2423 sl++;
2424 if (sl == conf->copies)
2425 sl = 0;
2426 } while (!success && sl != r10_bio->read_slot);
2427 rcu_read_unlock();
2428
2429 if (!success) {
NeilBrown58c54fc2011-07-28 11:39:25 +10002430 /* Cannot read from anywhere, just mark the block
2431 * as bad on the first device to discourage future
2432 * reads.
2433 */
NeilBrown6814d532006-10-03 01:15:45 -07002434 int dn = r10_bio->devs[r10_bio->read_slot].devnum;
NeilBrown58c54fc2011-07-28 11:39:25 +10002435 rdev = conf->mirrors[dn].rdev;
2436
2437 if (!rdev_set_badblocks(
2438 rdev,
2439 r10_bio->devs[r10_bio->read_slot].addr
2440 + sect,
NeilBrownfae8cc52012-02-14 11:10:10 +11002441 s, 0)) {
NeilBrown58c54fc2011-07-28 11:39:25 +10002442 md_error(mddev, rdev);
NeilBrownfae8cc52012-02-14 11:10:10 +11002443 r10_bio->devs[r10_bio->read_slot].bio
2444 = IO_BLOCKED;
2445 }
NeilBrown6814d532006-10-03 01:15:45 -07002446 break;
2447 }
2448
2449 start = sl;
2450 /* write it back and re-read */
2451 rcu_read_lock();
2452 while (sl != r10_bio->read_slot) {
Robert Becker67b8dc42009-12-14 12:49:57 +11002453 char b[BDEVNAME_SIZE];
Prasanna S. Panchamukhi0544a212010-06-24 13:31:03 +10002454
NeilBrown6814d532006-10-03 01:15:45 -07002455 if (sl==0)
2456 sl = conf->copies;
2457 sl--;
2458 d = r10_bio->devs[sl].devnum;
2459 rdev = rcu_dereference(conf->mirrors[d].rdev);
NeilBrown1294b9c2011-07-28 11:39:23 +10002460 if (!rdev ||
NeilBrown050b6612012-03-19 12:46:39 +11002461 test_bit(Unmerged, &rdev->flags) ||
NeilBrown1294b9c2011-07-28 11:39:23 +10002462 !test_bit(In_sync, &rdev->flags))
2463 continue;
2464
2465 atomic_inc(&rdev->nr_pending);
2466 rcu_read_unlock();
NeilBrown58c54fc2011-07-28 11:39:25 +10002467 if (r10_sync_page_io(rdev,
2468 r10_bio->devs[sl].addr +
2469 sect,
NeilBrown055d3742012-07-03 15:55:33 +10002470 s, conf->tmppage, WRITE)
NeilBrown1294b9c2011-07-28 11:39:23 +10002471 == 0) {
2472 /* Well, this device is dead */
2473 printk(KERN_NOTICE
2474 "md/raid10:%s: read correction "
2475 "write failed"
2476 " (%d sectors at %llu on %s)\n",
2477 mdname(mddev), s,
2478 (unsigned long long)(
NeilBrownf8c9e742012-05-21 09:28:33 +10002479 sect +
2480 choose_data_offset(r10_bio,
2481 rdev)),
NeilBrown1294b9c2011-07-28 11:39:23 +10002482 bdevname(rdev->bdev, b));
2483 printk(KERN_NOTICE "md/raid10:%s: %s: failing "
2484 "drive\n",
2485 mdname(mddev),
2486 bdevname(rdev->bdev, b));
NeilBrown6814d532006-10-03 01:15:45 -07002487 }
NeilBrown1294b9c2011-07-28 11:39:23 +10002488 rdev_dec_pending(rdev, mddev);
2489 rcu_read_lock();
NeilBrown6814d532006-10-03 01:15:45 -07002490 }
2491 sl = start;
2492 while (sl != r10_bio->read_slot) {
NeilBrown1294b9c2011-07-28 11:39:23 +10002493 char b[BDEVNAME_SIZE];
Prasanna S. Panchamukhi0544a212010-06-24 13:31:03 +10002494
NeilBrown6814d532006-10-03 01:15:45 -07002495 if (sl==0)
2496 sl = conf->copies;
2497 sl--;
2498 d = r10_bio->devs[sl].devnum;
2499 rdev = rcu_dereference(conf->mirrors[d].rdev);
NeilBrown1294b9c2011-07-28 11:39:23 +10002500 if (!rdev ||
2501 !test_bit(In_sync, &rdev->flags))
2502 continue;
Robert Becker67b8dc42009-12-14 12:49:57 +11002503
NeilBrown1294b9c2011-07-28 11:39:23 +10002504 atomic_inc(&rdev->nr_pending);
2505 rcu_read_unlock();
NeilBrown58c54fc2011-07-28 11:39:25 +10002506 switch (r10_sync_page_io(rdev,
2507 r10_bio->devs[sl].addr +
2508 sect,
NeilBrown055d3742012-07-03 15:55:33 +10002509 s, conf->tmppage,
NeilBrown58c54fc2011-07-28 11:39:25 +10002510 READ)) {
2511 case 0:
NeilBrown1294b9c2011-07-28 11:39:23 +10002512 /* Well, this device is dead */
2513 printk(KERN_NOTICE
2514 "md/raid10:%s: unable to read back "
2515 "corrected sectors"
2516 " (%d sectors at %llu on %s)\n",
2517 mdname(mddev), s,
2518 (unsigned long long)(
NeilBrownf8c9e742012-05-21 09:28:33 +10002519 sect +
2520 choose_data_offset(r10_bio, rdev)),
NeilBrown1294b9c2011-07-28 11:39:23 +10002521 bdevname(rdev->bdev, b));
2522 printk(KERN_NOTICE "md/raid10:%s: %s: failing "
2523 "drive\n",
2524 mdname(mddev),
2525 bdevname(rdev->bdev, b));
NeilBrown58c54fc2011-07-28 11:39:25 +10002526 break;
2527 case 1:
NeilBrown1294b9c2011-07-28 11:39:23 +10002528 printk(KERN_INFO
2529 "md/raid10:%s: read error corrected"
2530 " (%d sectors at %llu on %s)\n",
2531 mdname(mddev), s,
2532 (unsigned long long)(
NeilBrownf8c9e742012-05-21 09:28:33 +10002533 sect +
2534 choose_data_offset(r10_bio, rdev)),
NeilBrown1294b9c2011-07-28 11:39:23 +10002535 bdevname(rdev->bdev, b));
2536 atomic_add(s, &rdev->corrected_errors);
NeilBrown6814d532006-10-03 01:15:45 -07002537 }
NeilBrown1294b9c2011-07-28 11:39:23 +10002538
2539 rdev_dec_pending(rdev, mddev);
2540 rcu_read_lock();
NeilBrown6814d532006-10-03 01:15:45 -07002541 }
2542 rcu_read_unlock();
2543
2544 sectors -= s;
2545 sect += s;
2546 }
2547}
2548
NeilBrown9f2c9d12011-10-11 16:48:43 +11002549static int narrow_write_error(struct r10bio *r10_bio, int i)
NeilBrownbd870a12011-07-28 11:39:24 +10002550{
2551 struct bio *bio = r10_bio->master_bio;
NeilBrownfd01b882011-10-11 16:47:53 +11002552 struct mddev *mddev = r10_bio->mddev;
NeilBrowne879a872011-10-11 16:49:02 +11002553 struct r10conf *conf = mddev->private;
NeilBrown3cb03002011-10-11 16:45:26 +11002554 struct md_rdev *rdev = conf->mirrors[r10_bio->devs[i].devnum].rdev;
NeilBrownbd870a12011-07-28 11:39:24 +10002555 /* bio has the data to be written to slot 'i' where
2556 * we just recently had a write error.
2557 * We repeatedly clone the bio and trim down to one block,
2558 * then try the write. Where the write fails we record
2559 * a bad block.
2560 * It is conceivable that the bio doesn't exactly align with
2561 * blocks. We must handle this.
2562 *
2563 * We currently own a reference to the rdev.
2564 */
2565
2566 int block_sectors;
2567 sector_t sector;
2568 int sectors;
2569 int sect_to_write = r10_bio->sectors;
2570 int ok = 1;
2571
2572 if (rdev->badblocks.shift < 0)
2573 return 0;
2574
NeilBrownf04ebb02015-02-16 14:51:54 +11002575 block_sectors = roundup(1 << rdev->badblocks.shift,
2576 bdev_logical_block_size(rdev->bdev) >> 9);
NeilBrownbd870a12011-07-28 11:39:24 +10002577 sector = r10_bio->sector;
2578 sectors = ((r10_bio->sector + block_sectors)
2579 & ~(sector_t)(block_sectors - 1))
2580 - sector;
2581
2582 while (sect_to_write) {
2583 struct bio *wbio;
2584 if (sectors > sect_to_write)
2585 sectors = sect_to_write;
2586 /* Write at 'sector' for 'sectors' */
2587 wbio = bio_clone_mddev(bio, GFP_NOIO, mddev);
Kent Overstreet4f024f32013-10-11 15:44:27 -07002588 bio_trim(wbio, sector - bio->bi_iter.bi_sector, sectors);
2589 wbio->bi_iter.bi_sector = (r10_bio->devs[i].addr+
NeilBrownf8c9e742012-05-21 09:28:33 +10002590 choose_data_offset(r10_bio, rdev) +
NeilBrownbd870a12011-07-28 11:39:24 +10002591 (sector - r10_bio->sector));
2592 wbio->bi_bdev = rdev->bdev;
2593 if (submit_bio_wait(WRITE, wbio) == 0)
2594 /* Failure! */
2595 ok = rdev_set_badblocks(rdev, sector,
2596 sectors, 0)
2597 && ok;
2598
2599 bio_put(wbio);
2600 sect_to_write -= sectors;
2601 sector += sectors;
2602 sectors = block_sectors;
2603 }
2604 return ok;
2605}
2606
NeilBrown9f2c9d12011-10-11 16:48:43 +11002607static void handle_read_error(struct mddev *mddev, struct r10bio *r10_bio)
NeilBrown560f8e52011-07-28 11:39:23 +10002608{
2609 int slot = r10_bio->read_slot;
NeilBrown560f8e52011-07-28 11:39:23 +10002610 struct bio *bio;
NeilBrowne879a872011-10-11 16:49:02 +11002611 struct r10conf *conf = mddev->private;
NeilBrownabbf0982011-12-23 10:17:54 +11002612 struct md_rdev *rdev = r10_bio->devs[slot].rdev;
NeilBrown560f8e52011-07-28 11:39:23 +10002613 char b[BDEVNAME_SIZE];
2614 unsigned long do_sync;
NeilBrown856e08e2011-07-28 11:39:23 +10002615 int max_sectors;
NeilBrown560f8e52011-07-28 11:39:23 +10002616
2617 /* we got a read error. Maybe the drive is bad. Maybe just
2618 * the block and we can fix it.
2619 * We freeze all other IO, and try reading the block from
2620 * other devices. When we find one, we re-write
2621 * and check it that fixes the read error.
2622 * This is all done synchronously while the array is
2623 * frozen.
2624 */
NeilBrownfae8cc52012-02-14 11:10:10 +11002625 bio = r10_bio->devs[slot].bio;
2626 bdevname(bio->bi_bdev, b);
2627 bio_put(bio);
2628 r10_bio->devs[slot].bio = NULL;
2629
NeilBrown560f8e52011-07-28 11:39:23 +10002630 if (mddev->ro == 0) {
NeilBrowne2d59922013-06-12 11:01:22 +10002631 freeze_array(conf, 1);
NeilBrown560f8e52011-07-28 11:39:23 +10002632 fix_read_error(conf, mddev, r10_bio);
2633 unfreeze_array(conf);
NeilBrownfae8cc52012-02-14 11:10:10 +11002634 } else
2635 r10_bio->devs[slot].bio = IO_BLOCKED;
2636
NeilBrownabbf0982011-12-23 10:17:54 +11002637 rdev_dec_pending(rdev, mddev);
NeilBrown560f8e52011-07-28 11:39:23 +10002638
NeilBrown7399c312011-07-28 11:39:23 +10002639read_more:
NeilBrown96c3fd12011-12-23 10:17:54 +11002640 rdev = read_balance(conf, r10_bio, &max_sectors);
2641 if (rdev == NULL) {
NeilBrown560f8e52011-07-28 11:39:23 +10002642 printk(KERN_ALERT "md/raid10:%s: %s: unrecoverable I/O"
2643 " read error for block %llu\n",
NeilBrown7399c312011-07-28 11:39:23 +10002644 mdname(mddev), b,
NeilBrown560f8e52011-07-28 11:39:23 +10002645 (unsigned long long)r10_bio->sector);
2646 raid_end_bio_io(r10_bio);
NeilBrown560f8e52011-07-28 11:39:23 +10002647 return;
2648 }
2649
2650 do_sync = (r10_bio->master_bio->bi_rw & REQ_SYNC);
NeilBrown560f8e52011-07-28 11:39:23 +10002651 slot = r10_bio->read_slot;
NeilBrown560f8e52011-07-28 11:39:23 +10002652 printk_ratelimited(
2653 KERN_ERR
NeilBrown055d3742012-07-03 15:55:33 +10002654 "md/raid10:%s: %s: redirecting "
NeilBrown560f8e52011-07-28 11:39:23 +10002655 "sector %llu to another mirror\n",
2656 mdname(mddev),
2657 bdevname(rdev->bdev, b),
2658 (unsigned long long)r10_bio->sector);
2659 bio = bio_clone_mddev(r10_bio->master_bio,
2660 GFP_NOIO, mddev);
Kent Overstreet4f024f32013-10-11 15:44:27 -07002661 bio_trim(bio, r10_bio->sector - bio->bi_iter.bi_sector, max_sectors);
NeilBrown560f8e52011-07-28 11:39:23 +10002662 r10_bio->devs[slot].bio = bio;
NeilBrownabbf0982011-12-23 10:17:54 +11002663 r10_bio->devs[slot].rdev = rdev;
Kent Overstreet4f024f32013-10-11 15:44:27 -07002664 bio->bi_iter.bi_sector = r10_bio->devs[slot].addr
NeilBrownf8c9e742012-05-21 09:28:33 +10002665 + choose_data_offset(r10_bio, rdev);
NeilBrown560f8e52011-07-28 11:39:23 +10002666 bio->bi_bdev = rdev->bdev;
2667 bio->bi_rw = READ | do_sync;
2668 bio->bi_private = r10_bio;
2669 bio->bi_end_io = raid10_end_read_request;
NeilBrown7399c312011-07-28 11:39:23 +10002670 if (max_sectors < r10_bio->sectors) {
2671 /* Drat - have to split this up more */
2672 struct bio *mbio = r10_bio->master_bio;
2673 int sectors_handled =
2674 r10_bio->sector + max_sectors
Kent Overstreet4f024f32013-10-11 15:44:27 -07002675 - mbio->bi_iter.bi_sector;
NeilBrown7399c312011-07-28 11:39:23 +10002676 r10_bio->sectors = max_sectors;
2677 spin_lock_irq(&conf->device_lock);
2678 if (mbio->bi_phys_segments == 0)
2679 mbio->bi_phys_segments = 2;
2680 else
2681 mbio->bi_phys_segments++;
2682 spin_unlock_irq(&conf->device_lock);
2683 generic_make_request(bio);
NeilBrown7399c312011-07-28 11:39:23 +10002684
2685 r10_bio = mempool_alloc(conf->r10bio_pool,
2686 GFP_NOIO);
2687 r10_bio->master_bio = mbio;
Kent Overstreetaa8b57a2013-02-05 15:19:29 -08002688 r10_bio->sectors = bio_sectors(mbio) - sectors_handled;
NeilBrown7399c312011-07-28 11:39:23 +10002689 r10_bio->state = 0;
2690 set_bit(R10BIO_ReadError,
2691 &r10_bio->state);
2692 r10_bio->mddev = mddev;
Kent Overstreet4f024f32013-10-11 15:44:27 -07002693 r10_bio->sector = mbio->bi_iter.bi_sector
NeilBrown7399c312011-07-28 11:39:23 +10002694 + sectors_handled;
2695
2696 goto read_more;
2697 } else
2698 generic_make_request(bio);
NeilBrown560f8e52011-07-28 11:39:23 +10002699}
2700
NeilBrowne879a872011-10-11 16:49:02 +11002701static void handle_write_completed(struct r10conf *conf, struct r10bio *r10_bio)
NeilBrown749c55e2011-07-28 11:39:24 +10002702{
2703 /* Some sort of write request has finished and it
2704 * succeeded in writing where we thought there was a
2705 * bad block. So forget the bad block.
NeilBrown1a0b7cd2011-07-28 11:39:25 +10002706 * Or possibly if failed and we need to record
2707 * a bad block.
NeilBrown749c55e2011-07-28 11:39:24 +10002708 */
2709 int m;
NeilBrown3cb03002011-10-11 16:45:26 +11002710 struct md_rdev *rdev;
NeilBrown749c55e2011-07-28 11:39:24 +10002711
2712 if (test_bit(R10BIO_IsSync, &r10_bio->state) ||
2713 test_bit(R10BIO_IsRecover, &r10_bio->state)) {
NeilBrown1a0b7cd2011-07-28 11:39:25 +10002714 for (m = 0; m < conf->copies; m++) {
2715 int dev = r10_bio->devs[m].devnum;
2716 rdev = conf->mirrors[dev].rdev;
2717 if (r10_bio->devs[m].bio == NULL)
2718 continue;
2719 if (test_bit(BIO_UPTODATE,
NeilBrown749c55e2011-07-28 11:39:24 +10002720 &r10_bio->devs[m].bio->bi_flags)) {
NeilBrown749c55e2011-07-28 11:39:24 +10002721 rdev_clear_badblocks(
2722 rdev,
2723 r10_bio->devs[m].addr,
NeilBrownc6563a82012-05-21 09:27:00 +10002724 r10_bio->sectors, 0);
NeilBrown1a0b7cd2011-07-28 11:39:25 +10002725 } else {
2726 if (!rdev_set_badblocks(
2727 rdev,
2728 r10_bio->devs[m].addr,
2729 r10_bio->sectors, 0))
2730 md_error(conf->mddev, rdev);
NeilBrown749c55e2011-07-28 11:39:24 +10002731 }
NeilBrown9ad1aef2011-12-23 10:17:55 +11002732 rdev = conf->mirrors[dev].replacement;
2733 if (r10_bio->devs[m].repl_bio == NULL)
2734 continue;
2735 if (test_bit(BIO_UPTODATE,
2736 &r10_bio->devs[m].repl_bio->bi_flags)) {
2737 rdev_clear_badblocks(
2738 rdev,
2739 r10_bio->devs[m].addr,
NeilBrownc6563a82012-05-21 09:27:00 +10002740 r10_bio->sectors, 0);
NeilBrown9ad1aef2011-12-23 10:17:55 +11002741 } else {
2742 if (!rdev_set_badblocks(
2743 rdev,
2744 r10_bio->devs[m].addr,
2745 r10_bio->sectors, 0))
2746 md_error(conf->mddev, rdev);
2747 }
NeilBrown1a0b7cd2011-07-28 11:39:25 +10002748 }
NeilBrown749c55e2011-07-28 11:39:24 +10002749 put_buf(r10_bio);
2750 } else {
NeilBrownbd870a12011-07-28 11:39:24 +10002751 for (m = 0; m < conf->copies; m++) {
2752 int dev = r10_bio->devs[m].devnum;
2753 struct bio *bio = r10_bio->devs[m].bio;
2754 rdev = conf->mirrors[dev].rdev;
2755 if (bio == IO_MADE_GOOD) {
NeilBrown749c55e2011-07-28 11:39:24 +10002756 rdev_clear_badblocks(
2757 rdev,
2758 r10_bio->devs[m].addr,
NeilBrownc6563a82012-05-21 09:27:00 +10002759 r10_bio->sectors, 0);
NeilBrown749c55e2011-07-28 11:39:24 +10002760 rdev_dec_pending(rdev, conf->mddev);
NeilBrownbd870a12011-07-28 11:39:24 +10002761 } else if (bio != NULL &&
2762 !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
2763 if (!narrow_write_error(r10_bio, m)) {
2764 md_error(conf->mddev, rdev);
2765 set_bit(R10BIO_Degraded,
2766 &r10_bio->state);
2767 }
2768 rdev_dec_pending(rdev, conf->mddev);
NeilBrown749c55e2011-07-28 11:39:24 +10002769 }
NeilBrown475b0322011-12-23 10:17:55 +11002770 bio = r10_bio->devs[m].repl_bio;
2771 rdev = conf->mirrors[dev].replacement;
NeilBrown4ca40c22011-12-23 10:17:55 +11002772 if (rdev && bio == IO_MADE_GOOD) {
NeilBrown475b0322011-12-23 10:17:55 +11002773 rdev_clear_badblocks(
2774 rdev,
2775 r10_bio->devs[m].addr,
NeilBrownc6563a82012-05-21 09:27:00 +10002776 r10_bio->sectors, 0);
NeilBrown475b0322011-12-23 10:17:55 +11002777 rdev_dec_pending(rdev, conf->mddev);
2778 }
NeilBrownbd870a12011-07-28 11:39:24 +10002779 }
2780 if (test_bit(R10BIO_WriteError,
2781 &r10_bio->state))
2782 close_write(r10_bio);
NeilBrown749c55e2011-07-28 11:39:24 +10002783 raid_end_bio_io(r10_bio);
2784 }
2785}
2786
Shaohua Li4ed87312012-10-11 13:34:00 +11002787static void raid10d(struct md_thread *thread)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002788{
Shaohua Li4ed87312012-10-11 13:34:00 +11002789 struct mddev *mddev = thread->mddev;
NeilBrown9f2c9d12011-10-11 16:48:43 +11002790 struct r10bio *r10_bio;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002791 unsigned long flags;
NeilBrowne879a872011-10-11 16:49:02 +11002792 struct r10conf *conf = mddev->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002793 struct list_head *head = &conf->retry_list;
NeilBrowne1dfa0a2011-04-18 18:25:41 +10002794 struct blk_plug plug;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002795
2796 md_check_recovery(mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002797
NeilBrowne1dfa0a2011-04-18 18:25:41 +10002798 blk_start_plug(&plug);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002799 for (;;) {
NeilBrowna35e63e2008-03-04 14:29:29 -08002800
NeilBrown0021b7b2012-07-31 09:08:14 +02002801 flush_pending_writes(conf);
NeilBrowna35e63e2008-03-04 14:29:29 -08002802
Linus Torvalds1da177e2005-04-16 15:20:36 -07002803 spin_lock_irqsave(&conf->device_lock, flags);
NeilBrowna35e63e2008-03-04 14:29:29 -08002804 if (list_empty(head)) {
NeilBrown6cce3b232006-01-06 00:20:16 -08002805 spin_unlock_irqrestore(&conf->device_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002806 break;
NeilBrowna35e63e2008-03-04 14:29:29 -08002807 }
NeilBrown9f2c9d12011-10-11 16:48:43 +11002808 r10_bio = list_entry(head->prev, struct r10bio, retry_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002809 list_del(head->prev);
NeilBrown4443ae12006-01-06 00:20:28 -08002810 conf->nr_queued--;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002811 spin_unlock_irqrestore(&conf->device_lock, flags);
2812
2813 mddev = r10_bio->mddev;
NeilBrown070ec552009-06-16 16:54:21 +10002814 conf = mddev->private;
NeilBrownbd870a12011-07-28 11:39:24 +10002815 if (test_bit(R10BIO_MadeGood, &r10_bio->state) ||
2816 test_bit(R10BIO_WriteError, &r10_bio->state))
NeilBrown749c55e2011-07-28 11:39:24 +10002817 handle_write_completed(conf, r10_bio);
NeilBrown3ea7daa2012-05-22 13:53:47 +10002818 else if (test_bit(R10BIO_IsReshape, &r10_bio->state))
2819 reshape_request_write(mddev, r10_bio);
NeilBrown749c55e2011-07-28 11:39:24 +10002820 else if (test_bit(R10BIO_IsSync, &r10_bio->state))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002821 sync_request_write(mddev, r10_bio);
Jens Axboe7eaceac2011-03-10 08:52:07 +01002822 else if (test_bit(R10BIO_IsRecover, &r10_bio->state))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002823 recovery_request_write(mddev, r10_bio);
NeilBrown856e08e2011-07-28 11:39:23 +10002824 else if (test_bit(R10BIO_ReadError, &r10_bio->state))
NeilBrown560f8e52011-07-28 11:39:23 +10002825 handle_read_error(mddev, r10_bio);
NeilBrown856e08e2011-07-28 11:39:23 +10002826 else {
2827 /* just a partial read to be scheduled from a
2828 * separate context
2829 */
2830 int slot = r10_bio->read_slot;
2831 generic_make_request(r10_bio->devs[slot].bio);
2832 }
NeilBrown4443ae12006-01-06 00:20:28 -08002833
NeilBrown1d9d5242009-10-16 15:55:32 +11002834 cond_resched();
NeilBrownde393cd2011-07-28 11:31:48 +10002835 if (mddev->flags & ~(1<<MD_CHANGE_PENDING))
2836 md_check_recovery(mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002837 }
NeilBrowne1dfa0a2011-04-18 18:25:41 +10002838 blk_finish_plug(&plug);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002839}
2840
NeilBrowne879a872011-10-11 16:49:02 +11002841static int init_resync(struct r10conf *conf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002842{
2843 int buffs;
NeilBrown69335ef2011-12-23 10:17:54 +11002844 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002845
2846 buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE;
Eric Sesterhennb6385482006-04-02 13:34:29 +02002847 BUG_ON(conf->r10buf_pool);
NeilBrown69335ef2011-12-23 10:17:54 +11002848 conf->have_replacement = 0;
NeilBrown5cf00fc2012-05-21 09:28:20 +10002849 for (i = 0; i < conf->geo.raid_disks; i++)
NeilBrown69335ef2011-12-23 10:17:54 +11002850 if (conf->mirrors[i].replacement)
2851 conf->have_replacement = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002852 conf->r10buf_pool = mempool_create(buffs, r10buf_pool_alloc, r10buf_pool_free, conf);
2853 if (!conf->r10buf_pool)
2854 return -ENOMEM;
2855 conf->next_resync = 0;
2856 return 0;
2857}
2858
2859/*
2860 * perform a "sync" on one "block"
2861 *
2862 * We need to make sure that no normal I/O request - particularly write
2863 * requests - conflict with active sync requests.
2864 *
2865 * This is achieved by tracking pending requests and a 'barrier' concept
2866 * that can be installed to exclude normal IO requests.
2867 *
2868 * Resync and recovery are handled very differently.
2869 * We differentiate by looking at MD_RECOVERY_SYNC in mddev->recovery.
2870 *
2871 * For resync, we iterate over virtual addresses, read all copies,
2872 * and update if there are differences. If only one copy is live,
2873 * skip it.
2874 * For recovery, we iterate over physical addresses, read a good
2875 * value for each non-in_sync drive, and over-write.
2876 *
2877 * So, for recovery we may have several outstanding complex requests for a
2878 * given address, one for each out-of-sync device. We model this by allocating
2879 * a number of r10_bio structures, one for each out-of-sync device.
2880 * As we setup these structures, we collect all bio's together into a list
2881 * which we then process collectively to add pages, and then process again
2882 * to pass to generic_make_request.
2883 *
2884 * The r10_bio structures are linked using a borrowed master_bio pointer.
2885 * This link is counted in ->remaining. When the r10_bio that points to NULL
2886 * has its remaining count decremented to 0, the whole complex operation
2887 * is complete.
2888 *
2889 */
2890
NeilBrownfd01b882011-10-11 16:47:53 +11002891static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
NeilBrownab9d47e2011-05-11 14:54:41 +10002892 int *skipped, int go_faster)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002893{
NeilBrowne879a872011-10-11 16:49:02 +11002894 struct r10conf *conf = mddev->private;
NeilBrown9f2c9d12011-10-11 16:48:43 +11002895 struct r10bio *r10_bio;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002896 struct bio *biolist = NULL, *bio;
2897 sector_t max_sector, nr_sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002898 int i;
NeilBrown6cce3b232006-01-06 00:20:16 -08002899 int max_sync;
NeilBrown57dab0b2010-10-19 10:03:39 +11002900 sector_t sync_blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002901 sector_t sectors_skipped = 0;
2902 int chunks_skipped = 0;
NeilBrown5cf00fc2012-05-21 09:28:20 +10002903 sector_t chunk_mask = conf->geo.chunk_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002904
2905 if (!conf->r10buf_pool)
2906 if (init_resync(conf))
NeilBrown57afd892005-06-21 17:17:13 -07002907 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002908
Martin Wilck7e83ccb2013-04-24 11:42:42 +10002909 /*
2910 * Allow skipping a full rebuild for incremental assembly
2911 * of a clean array, like RAID1 does.
2912 */
2913 if (mddev->bitmap == NULL &&
2914 mddev->recovery_cp == MaxSector &&
NeilBrown13765122013-07-04 16:41:53 +10002915 mddev->reshape_position == MaxSector &&
2916 !test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
Martin Wilck7e83ccb2013-04-24 11:42:42 +10002917 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
NeilBrown13765122013-07-04 16:41:53 +10002918 !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
Martin Wilck7e83ccb2013-04-24 11:42:42 +10002919 conf->fullsync == 0) {
2920 *skipped = 1;
NeilBrown13765122013-07-04 16:41:53 +10002921 return mddev->dev_sectors - sector_nr;
Martin Wilck7e83ccb2013-04-24 11:42:42 +10002922 }
2923
Linus Torvalds1da177e2005-04-16 15:20:36 -07002924 skipped:
Andre Noll58c0fed2009-03-31 14:33:13 +11002925 max_sector = mddev->dev_sectors;
NeilBrown3ea7daa2012-05-22 13:53:47 +10002926 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
2927 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002928 max_sector = mddev->resync_max_sectors;
2929 if (sector_nr >= max_sector) {
NeilBrown6cce3b232006-01-06 00:20:16 -08002930 /* If we aborted, we need to abort the
2931 * sync on the 'current' bitmap chucks (there can
2932 * be several when recovering multiple devices).
2933 * as we may have started syncing it but not finished.
2934 * We can find the current address in
2935 * mddev->curr_resync, but for recovery,
2936 * we need to convert that to several
2937 * virtual addresses.
2938 */
NeilBrown3ea7daa2012-05-22 13:53:47 +10002939 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
2940 end_reshape(conf);
NeilBrownb3968552014-08-18 13:59:50 +10002941 close_sync(conf);
NeilBrown3ea7daa2012-05-22 13:53:47 +10002942 return 0;
2943 }
2944
NeilBrown6cce3b232006-01-06 00:20:16 -08002945 if (mddev->curr_resync < max_sector) { /* aborted */
2946 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2947 bitmap_end_sync(mddev->bitmap, mddev->curr_resync,
2948 &sync_blocks, 1);
NeilBrown5cf00fc2012-05-21 09:28:20 +10002949 else for (i = 0; i < conf->geo.raid_disks; i++) {
NeilBrown6cce3b232006-01-06 00:20:16 -08002950 sector_t sect =
2951 raid10_find_virt(conf, mddev->curr_resync, i);
2952 bitmap_end_sync(mddev->bitmap, sect,
2953 &sync_blocks, 1);
2954 }
NeilBrown9ad1aef2011-12-23 10:17:55 +11002955 } else {
2956 /* completed sync */
2957 if ((!mddev->bitmap || conf->fullsync)
2958 && conf->have_replacement
2959 && test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
2960 /* Completed a full sync so the replacements
2961 * are now fully recovered.
2962 */
NeilBrown5cf00fc2012-05-21 09:28:20 +10002963 for (i = 0; i < conf->geo.raid_disks; i++)
NeilBrown9ad1aef2011-12-23 10:17:55 +11002964 if (conf->mirrors[i].replacement)
2965 conf->mirrors[i].replacement
2966 ->recovery_offset
2967 = MaxSector;
2968 }
NeilBrown6cce3b232006-01-06 00:20:16 -08002969 conf->fullsync = 0;
NeilBrown9ad1aef2011-12-23 10:17:55 +11002970 }
NeilBrown6cce3b232006-01-06 00:20:16 -08002971 bitmap_close_sync(mddev->bitmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002972 close_sync(conf);
NeilBrown57afd892005-06-21 17:17:13 -07002973 *skipped = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002974 return sectors_skipped;
2975 }
NeilBrown3ea7daa2012-05-22 13:53:47 +10002976
2977 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2978 return reshape_request(mddev, sector_nr, skipped);
2979
NeilBrown5cf00fc2012-05-21 09:28:20 +10002980 if (chunks_skipped >= conf->geo.raid_disks) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002981 /* if there has been nothing to do on any drive,
2982 * then there is nothing to do at all..
2983 */
NeilBrown57afd892005-06-21 17:17:13 -07002984 *skipped = 1;
2985 return (max_sector - sector_nr) + sectors_skipped;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002986 }
2987
NeilBrownc6207272008-02-06 01:39:52 -08002988 if (max_sector > mddev->resync_max)
2989 max_sector = mddev->resync_max; /* Don't do IO beyond here */
2990
Linus Torvalds1da177e2005-04-16 15:20:36 -07002991 /* make sure whole request will fit in a chunk - if chunks
2992 * are meaningful
2993 */
NeilBrown5cf00fc2012-05-21 09:28:20 +10002994 if (conf->geo.near_copies < conf->geo.raid_disks &&
2995 max_sector > (sector_nr | chunk_mask))
2996 max_sector = (sector_nr | chunk_mask) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002997 /*
2998 * If there is non-resync activity waiting for us then
2999 * put in a delay to throttle resync.
3000 */
NeilBrown0a27ec92006-01-06 00:20:13 -08003001 if (!go_faster && conf->nr_waiting)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003002 msleep_interruptible(1000);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003003
3004 /* Again, very different code for resync and recovery.
3005 * Both must result in an r10bio with a list of bios that
3006 * have bi_end_io, bi_sector, bi_bdev set,
3007 * and bi_private set to the r10bio.
3008 * For recovery, we may actually create several r10bios
3009 * with 2 bios in each, that correspond to the bios in the main one.
3010 * In this case, the subordinate r10bios link back through a
3011 * borrowed master_bio pointer, and the counter in the master
3012 * includes a ref from each subordinate.
3013 */
3014 /* First, we decide what to do and set ->bi_end_io
3015 * To end_sync_read if we want to read, and
3016 * end_sync_write if we will want to write.
3017 */
3018
NeilBrown6cce3b232006-01-06 00:20:16 -08003019 max_sync = RESYNC_PAGES << (PAGE_SHIFT-9);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003020 if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3021 /* recovery... the complicated one */
NeilBrowne875ece2011-07-28 11:39:24 +10003022 int j;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003023 r10_bio = NULL;
3024
NeilBrown5cf00fc2012-05-21 09:28:20 +10003025 for (i = 0 ; i < conf->geo.raid_disks; i++) {
NeilBrownab9d47e2011-05-11 14:54:41 +10003026 int still_degraded;
NeilBrown9f2c9d12011-10-11 16:48:43 +11003027 struct r10bio *rb2;
NeilBrownab9d47e2011-05-11 14:54:41 +10003028 sector_t sect;
3029 int must_sync;
NeilBrowne875ece2011-07-28 11:39:24 +10003030 int any_working;
Jonathan Brassowdc280d982012-07-31 10:03:52 +10003031 struct raid10_info *mirror = &conf->mirrors[i];
NeilBrownab9d47e2011-05-11 14:54:41 +10003032
NeilBrown24afd802011-12-23 10:17:55 +11003033 if ((mirror->rdev == NULL ||
3034 test_bit(In_sync, &mirror->rdev->flags))
3035 &&
3036 (mirror->replacement == NULL ||
3037 test_bit(Faulty,
3038 &mirror->replacement->flags)))
NeilBrownab9d47e2011-05-11 14:54:41 +10003039 continue;
3040
3041 still_degraded = 0;
3042 /* want to reconstruct this device */
3043 rb2 = r10_bio;
3044 sect = raid10_find_virt(conf, sector_nr, i);
NeilBrownfc448a12012-07-03 10:37:30 +10003045 if (sect >= mddev->resync_max_sectors) {
3046 /* last stripe is not complete - don't
3047 * try to recover this sector.
3048 */
3049 continue;
3050 }
NeilBrown24afd802011-12-23 10:17:55 +11003051 /* Unless we are doing a full sync, or a replacement
3052 * we only need to recover the block if it is set in
3053 * the bitmap
NeilBrownab9d47e2011-05-11 14:54:41 +10003054 */
3055 must_sync = bitmap_start_sync(mddev->bitmap, sect,
3056 &sync_blocks, 1);
3057 if (sync_blocks < max_sync)
3058 max_sync = sync_blocks;
3059 if (!must_sync &&
NeilBrown24afd802011-12-23 10:17:55 +11003060 mirror->replacement == NULL &&
NeilBrownab9d47e2011-05-11 14:54:41 +10003061 !conf->fullsync) {
3062 /* yep, skip the sync_blocks here, but don't assume
3063 * that there will never be anything to do here
NeilBrown6cce3b232006-01-06 00:20:16 -08003064 */
NeilBrownab9d47e2011-05-11 14:54:41 +10003065 chunks_skipped = -1;
3066 continue;
3067 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003068
NeilBrownab9d47e2011-05-11 14:54:41 +10003069 r10_bio = mempool_alloc(conf->r10buf_pool, GFP_NOIO);
NeilBrowncb8b12b2014-08-18 14:38:45 +10003070 r10_bio->state = 0;
NeilBrownab9d47e2011-05-11 14:54:41 +10003071 raise_barrier(conf, rb2 != NULL);
3072 atomic_set(&r10_bio->remaining, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003073
NeilBrownab9d47e2011-05-11 14:54:41 +10003074 r10_bio->master_bio = (struct bio*)rb2;
3075 if (rb2)
3076 atomic_inc(&rb2->remaining);
3077 r10_bio->mddev = mddev;
3078 set_bit(R10BIO_IsRecover, &r10_bio->state);
3079 r10_bio->sector = sect;
NeilBrown6cce3b232006-01-06 00:20:16 -08003080
NeilBrownab9d47e2011-05-11 14:54:41 +10003081 raid10_find_phys(conf, r10_bio);
NeilBrown18055562009-05-07 12:48:10 +10003082
NeilBrownab9d47e2011-05-11 14:54:41 +10003083 /* Need to check if the array will still be
3084 * degraded
3085 */
NeilBrown5cf00fc2012-05-21 09:28:20 +10003086 for (j = 0; j < conf->geo.raid_disks; j++)
NeilBrownab9d47e2011-05-11 14:54:41 +10003087 if (conf->mirrors[j].rdev == NULL ||
3088 test_bit(Faulty, &conf->mirrors[j].rdev->flags)) {
3089 still_degraded = 1;
NeilBrown87fc7672005-09-09 16:24:04 -07003090 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003091 }
NeilBrownab9d47e2011-05-11 14:54:41 +10003092
3093 must_sync = bitmap_start_sync(mddev->bitmap, sect,
3094 &sync_blocks, still_degraded);
3095
NeilBrowne875ece2011-07-28 11:39:24 +10003096 any_working = 0;
NeilBrownab9d47e2011-05-11 14:54:41 +10003097 for (j=0; j<conf->copies;j++) {
NeilBrowne875ece2011-07-28 11:39:24 +10003098 int k;
NeilBrownab9d47e2011-05-11 14:54:41 +10003099 int d = r10_bio->devs[j].devnum;
NeilBrown5e570282011-07-28 11:39:25 +10003100 sector_t from_addr, to_addr;
NeilBrown3cb03002011-10-11 16:45:26 +11003101 struct md_rdev *rdev;
NeilBrown40c356c2011-07-28 11:39:24 +10003102 sector_t sector, first_bad;
3103 int bad_sectors;
NeilBrownab9d47e2011-05-11 14:54:41 +10003104 if (!conf->mirrors[d].rdev ||
3105 !test_bit(In_sync, &conf->mirrors[d].rdev->flags))
3106 continue;
3107 /* This is where we read from */
NeilBrowne875ece2011-07-28 11:39:24 +10003108 any_working = 1;
NeilBrown40c356c2011-07-28 11:39:24 +10003109 rdev = conf->mirrors[d].rdev;
3110 sector = r10_bio->devs[j].addr;
3111
3112 if (is_badblock(rdev, sector, max_sync,
3113 &first_bad, &bad_sectors)) {
3114 if (first_bad > sector)
3115 max_sync = first_bad - sector;
3116 else {
3117 bad_sectors -= (sector
3118 - first_bad);
3119 if (max_sync > bad_sectors)
3120 max_sync = bad_sectors;
3121 continue;
3122 }
3123 }
NeilBrownab9d47e2011-05-11 14:54:41 +10003124 bio = r10_bio->devs[0].bio;
Kent Overstreet8be185f2012-09-06 14:14:43 -07003125 bio_reset(bio);
NeilBrownab9d47e2011-05-11 14:54:41 +10003126 bio->bi_next = biolist;
3127 biolist = bio;
3128 bio->bi_private = r10_bio;
3129 bio->bi_end_io = end_sync_read;
3130 bio->bi_rw = READ;
NeilBrown5e570282011-07-28 11:39:25 +10003131 from_addr = r10_bio->devs[j].addr;
Kent Overstreet4f024f32013-10-11 15:44:27 -07003132 bio->bi_iter.bi_sector = from_addr +
3133 rdev->data_offset;
NeilBrown24afd802011-12-23 10:17:55 +11003134 bio->bi_bdev = rdev->bdev;
3135 atomic_inc(&rdev->nr_pending);
3136 /* and we write to 'i' (if not in_sync) */
NeilBrownab9d47e2011-05-11 14:54:41 +10003137
3138 for (k=0; k<conf->copies; k++)
3139 if (r10_bio->devs[k].devnum == i)
3140 break;
3141 BUG_ON(k == conf->copies);
NeilBrown5e570282011-07-28 11:39:25 +10003142 to_addr = r10_bio->devs[k].addr;
NeilBrownab9d47e2011-05-11 14:54:41 +10003143 r10_bio->devs[0].devnum = d;
NeilBrown5e570282011-07-28 11:39:25 +10003144 r10_bio->devs[0].addr = from_addr;
NeilBrownab9d47e2011-05-11 14:54:41 +10003145 r10_bio->devs[1].devnum = i;
NeilBrown5e570282011-07-28 11:39:25 +10003146 r10_bio->devs[1].addr = to_addr;
NeilBrownab9d47e2011-05-11 14:54:41 +10003147
NeilBrown24afd802011-12-23 10:17:55 +11003148 rdev = mirror->rdev;
3149 if (!test_bit(In_sync, &rdev->flags)) {
3150 bio = r10_bio->devs[1].bio;
Kent Overstreet8be185f2012-09-06 14:14:43 -07003151 bio_reset(bio);
NeilBrown24afd802011-12-23 10:17:55 +11003152 bio->bi_next = biolist;
3153 biolist = bio;
3154 bio->bi_private = r10_bio;
3155 bio->bi_end_io = end_sync_write;
3156 bio->bi_rw = WRITE;
Kent Overstreet4f024f32013-10-11 15:44:27 -07003157 bio->bi_iter.bi_sector = to_addr
NeilBrown24afd802011-12-23 10:17:55 +11003158 + rdev->data_offset;
3159 bio->bi_bdev = rdev->bdev;
3160 atomic_inc(&r10_bio->remaining);
3161 } else
3162 r10_bio->devs[1].bio->bi_end_io = NULL;
3163
3164 /* and maybe write to replacement */
3165 bio = r10_bio->devs[1].repl_bio;
3166 if (bio)
3167 bio->bi_end_io = NULL;
3168 rdev = mirror->replacement;
3169 /* Note: if rdev != NULL, then bio
3170 * cannot be NULL as r10buf_pool_alloc will
3171 * have allocated it.
3172 * So the second test here is pointless.
3173 * But it keeps semantic-checkers happy, and
3174 * this comment keeps human reviewers
3175 * happy.
3176 */
3177 if (rdev == NULL || bio == NULL ||
3178 test_bit(Faulty, &rdev->flags))
3179 break;
Kent Overstreet8be185f2012-09-06 14:14:43 -07003180 bio_reset(bio);
NeilBrown24afd802011-12-23 10:17:55 +11003181 bio->bi_next = biolist;
3182 biolist = bio;
3183 bio->bi_private = r10_bio;
3184 bio->bi_end_io = end_sync_write;
3185 bio->bi_rw = WRITE;
Kent Overstreet4f024f32013-10-11 15:44:27 -07003186 bio->bi_iter.bi_sector = to_addr +
3187 rdev->data_offset;
NeilBrown24afd802011-12-23 10:17:55 +11003188 bio->bi_bdev = rdev->bdev;
3189 atomic_inc(&r10_bio->remaining);
NeilBrownab9d47e2011-05-11 14:54:41 +10003190 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003191 }
NeilBrownab9d47e2011-05-11 14:54:41 +10003192 if (j == conf->copies) {
NeilBrowne875ece2011-07-28 11:39:24 +10003193 /* Cannot recover, so abort the recovery or
3194 * record a bad block */
NeilBrowne875ece2011-07-28 11:39:24 +10003195 if (any_working) {
3196 /* problem is that there are bad blocks
3197 * on other device(s)
3198 */
3199 int k;
3200 for (k = 0; k < conf->copies; k++)
3201 if (r10_bio->devs[k].devnum == i)
3202 break;
NeilBrown24afd802011-12-23 10:17:55 +11003203 if (!test_bit(In_sync,
3204 &mirror->rdev->flags)
3205 && !rdev_set_badblocks(
3206 mirror->rdev,
3207 r10_bio->devs[k].addr,
3208 max_sync, 0))
3209 any_working = 0;
3210 if (mirror->replacement &&
3211 !rdev_set_badblocks(
3212 mirror->replacement,
NeilBrowne875ece2011-07-28 11:39:24 +10003213 r10_bio->devs[k].addr,
3214 max_sync, 0))
3215 any_working = 0;
3216 }
3217 if (!any_working) {
3218 if (!test_and_set_bit(MD_RECOVERY_INTR,
3219 &mddev->recovery))
3220 printk(KERN_INFO "md/raid10:%s: insufficient "
3221 "working devices for recovery.\n",
3222 mdname(mddev));
NeilBrown24afd802011-12-23 10:17:55 +11003223 mirror->recovery_disabled
NeilBrowne875ece2011-07-28 11:39:24 +10003224 = mddev->recovery_disabled;
3225 }
NeilBrowne8b84912014-01-06 10:35:34 +11003226 put_buf(r10_bio);
3227 if (rb2)
3228 atomic_dec(&rb2->remaining);
3229 r10_bio = rb2;
NeilBrownab9d47e2011-05-11 14:54:41 +10003230 break;
3231 }
3232 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003233 if (biolist == NULL) {
3234 while (r10_bio) {
NeilBrown9f2c9d12011-10-11 16:48:43 +11003235 struct r10bio *rb2 = r10_bio;
3236 r10_bio = (struct r10bio*) rb2->master_bio;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003237 rb2->master_bio = NULL;
3238 put_buf(rb2);
3239 }
3240 goto giveup;
3241 }
3242 } else {
3243 /* resync. Schedule a read for every block at this virt offset */
3244 int count = 0;
NeilBrown6cce3b232006-01-06 00:20:16 -08003245
NeilBrown78200d42009-02-25 13:18:47 +11003246 bitmap_cond_end_sync(mddev->bitmap, sector_nr);
3247
NeilBrown6cce3b232006-01-06 00:20:16 -08003248 if (!bitmap_start_sync(mddev->bitmap, sector_nr,
3249 &sync_blocks, mddev->degraded) &&
NeilBrownab9d47e2011-05-11 14:54:41 +10003250 !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED,
3251 &mddev->recovery)) {
NeilBrown6cce3b232006-01-06 00:20:16 -08003252 /* We can skip this block */
3253 *skipped = 1;
3254 return sync_blocks + sectors_skipped;
3255 }
3256 if (sync_blocks < max_sync)
3257 max_sync = sync_blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003258 r10_bio = mempool_alloc(conf->r10buf_pool, GFP_NOIO);
NeilBrowncb8b12b2014-08-18 14:38:45 +10003259 r10_bio->state = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003260
Linus Torvalds1da177e2005-04-16 15:20:36 -07003261 r10_bio->mddev = mddev;
3262 atomic_set(&r10_bio->remaining, 0);
NeilBrown6cce3b232006-01-06 00:20:16 -08003263 raise_barrier(conf, 0);
3264 conf->next_resync = sector_nr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003265
3266 r10_bio->master_bio = NULL;
3267 r10_bio->sector = sector_nr;
3268 set_bit(R10BIO_IsSync, &r10_bio->state);
3269 raid10_find_phys(conf, r10_bio);
NeilBrown5cf00fc2012-05-21 09:28:20 +10003270 r10_bio->sectors = (sector_nr | chunk_mask) - sector_nr + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003271
NeilBrown5cf00fc2012-05-21 09:28:20 +10003272 for (i = 0; i < conf->copies; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003273 int d = r10_bio->devs[i].devnum;
NeilBrown40c356c2011-07-28 11:39:24 +10003274 sector_t first_bad, sector;
3275 int bad_sectors;
3276
NeilBrown9ad1aef2011-12-23 10:17:55 +11003277 if (r10_bio->devs[i].repl_bio)
3278 r10_bio->devs[i].repl_bio->bi_end_io = NULL;
3279
Linus Torvalds1da177e2005-04-16 15:20:36 -07003280 bio = r10_bio->devs[i].bio;
Kent Overstreet8be185f2012-09-06 14:14:43 -07003281 bio_reset(bio);
NeilBrownaf03b8e2007-06-16 10:16:06 -07003282 clear_bit(BIO_UPTODATE, &bio->bi_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003283 if (conf->mirrors[d].rdev == NULL ||
NeilBrownb2d444d2005-11-08 21:39:31 -08003284 test_bit(Faulty, &conf->mirrors[d].rdev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003285 continue;
NeilBrown40c356c2011-07-28 11:39:24 +10003286 sector = r10_bio->devs[i].addr;
3287 if (is_badblock(conf->mirrors[d].rdev,
3288 sector, max_sync,
3289 &first_bad, &bad_sectors)) {
3290 if (first_bad > sector)
3291 max_sync = first_bad - sector;
3292 else {
3293 bad_sectors -= (sector - first_bad);
3294 if (max_sync > bad_sectors)
Dan Carpenter91502f02012-10-11 14:20:58 +11003295 max_sync = bad_sectors;
NeilBrown40c356c2011-07-28 11:39:24 +10003296 continue;
3297 }
3298 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003299 atomic_inc(&conf->mirrors[d].rdev->nr_pending);
3300 atomic_inc(&r10_bio->remaining);
3301 bio->bi_next = biolist;
3302 biolist = bio;
3303 bio->bi_private = r10_bio;
3304 bio->bi_end_io = end_sync_read;
NeilBrown802ba062006-12-13 00:34:13 -08003305 bio->bi_rw = READ;
Kent Overstreet4f024f32013-10-11 15:44:27 -07003306 bio->bi_iter.bi_sector = sector +
Linus Torvalds1da177e2005-04-16 15:20:36 -07003307 conf->mirrors[d].rdev->data_offset;
3308 bio->bi_bdev = conf->mirrors[d].rdev->bdev;
3309 count++;
NeilBrown9ad1aef2011-12-23 10:17:55 +11003310
3311 if (conf->mirrors[d].replacement == NULL ||
3312 test_bit(Faulty,
3313 &conf->mirrors[d].replacement->flags))
3314 continue;
3315
3316 /* Need to set up for writing to the replacement */
3317 bio = r10_bio->devs[i].repl_bio;
Kent Overstreet8be185f2012-09-06 14:14:43 -07003318 bio_reset(bio);
NeilBrown9ad1aef2011-12-23 10:17:55 +11003319 clear_bit(BIO_UPTODATE, &bio->bi_flags);
3320
3321 sector = r10_bio->devs[i].addr;
3322 atomic_inc(&conf->mirrors[d].rdev->nr_pending);
3323 bio->bi_next = biolist;
3324 biolist = bio;
3325 bio->bi_private = r10_bio;
3326 bio->bi_end_io = end_sync_write;
3327 bio->bi_rw = WRITE;
Kent Overstreet4f024f32013-10-11 15:44:27 -07003328 bio->bi_iter.bi_sector = sector +
NeilBrown9ad1aef2011-12-23 10:17:55 +11003329 conf->mirrors[d].replacement->data_offset;
3330 bio->bi_bdev = conf->mirrors[d].replacement->bdev;
3331 count++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003332 }
3333
3334 if (count < 2) {
3335 for (i=0; i<conf->copies; i++) {
3336 int d = r10_bio->devs[i].devnum;
3337 if (r10_bio->devs[i].bio->bi_end_io)
NeilBrownab9d47e2011-05-11 14:54:41 +10003338 rdev_dec_pending(conf->mirrors[d].rdev,
3339 mddev);
NeilBrown9ad1aef2011-12-23 10:17:55 +11003340 if (r10_bio->devs[i].repl_bio &&
3341 r10_bio->devs[i].repl_bio->bi_end_io)
3342 rdev_dec_pending(
3343 conf->mirrors[d].replacement,
3344 mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003345 }
3346 put_buf(r10_bio);
3347 biolist = NULL;
3348 goto giveup;
3349 }
3350 }
3351
Linus Torvalds1da177e2005-04-16 15:20:36 -07003352 nr_sectors = 0;
NeilBrown6cce3b232006-01-06 00:20:16 -08003353 if (sector_nr + max_sync < max_sector)
3354 max_sector = sector_nr + max_sync;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003355 do {
3356 struct page *page;
3357 int len = PAGE_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003358 if (sector_nr + (len>>9) > max_sector)
3359 len = (max_sector - sector_nr) << 9;
3360 if (len == 0)
3361 break;
3362 for (bio= biolist ; bio ; bio=bio->bi_next) {
NeilBrownab9d47e2011-05-11 14:54:41 +10003363 struct bio *bio2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003364 page = bio->bi_io_vec[bio->bi_vcnt].bv_page;
NeilBrownab9d47e2011-05-11 14:54:41 +10003365 if (bio_add_page(bio, page, len, 0))
3366 continue;
3367
3368 /* stop here */
3369 bio->bi_io_vec[bio->bi_vcnt].bv_page = page;
3370 for (bio2 = biolist;
3371 bio2 && bio2 != bio;
3372 bio2 = bio2->bi_next) {
3373 /* remove last page from this bio */
3374 bio2->bi_vcnt--;
Kent Overstreet4f024f32013-10-11 15:44:27 -07003375 bio2->bi_iter.bi_size -= len;
NeilBrown3fd83712014-08-23 20:19:26 +10003376 __clear_bit(BIO_SEG_VALID, &bio2->bi_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003377 }
NeilBrownab9d47e2011-05-11 14:54:41 +10003378 goto bio_full;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003379 }
3380 nr_sectors += len>>9;
3381 sector_nr += len>>9;
3382 } while (biolist->bi_vcnt < RESYNC_PAGES);
3383 bio_full:
3384 r10_bio->sectors = nr_sectors;
3385
3386 while (biolist) {
3387 bio = biolist;
3388 biolist = biolist->bi_next;
3389
3390 bio->bi_next = NULL;
3391 r10_bio = bio->bi_private;
3392 r10_bio->sectors = nr_sectors;
3393
3394 if (bio->bi_end_io == end_sync_read) {
3395 md_sync_acct(bio->bi_bdev, nr_sectors);
NeilBrown7bb23c42013-07-16 16:50:47 +10003396 set_bit(BIO_UPTODATE, &bio->bi_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003397 generic_make_request(bio);
3398 }
3399 }
3400
NeilBrown57afd892005-06-21 17:17:13 -07003401 if (sectors_skipped)
3402 /* pretend they weren't skipped, it makes
3403 * no important difference in this case
3404 */
3405 md_done_sync(mddev, sectors_skipped, 1);
3406
Linus Torvalds1da177e2005-04-16 15:20:36 -07003407 return sectors_skipped + nr_sectors;
3408 giveup:
3409 /* There is nowhere to write, so all non-sync
NeilBrowne875ece2011-07-28 11:39:24 +10003410 * drives must be failed or in resync, all drives
3411 * have a bad block, so try the next chunk...
Linus Torvalds1da177e2005-04-16 15:20:36 -07003412 */
NeilBrown09b40682009-02-25 13:18:47 +11003413 if (sector_nr + max_sync < max_sector)
3414 max_sector = sector_nr + max_sync;
3415
3416 sectors_skipped += (max_sector - sector_nr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003417 chunks_skipped ++;
3418 sector_nr = max_sector;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003419 goto skipped;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003420}
3421
Dan Williams80c3a6c2009-03-17 18:10:40 -07003422static sector_t
NeilBrownfd01b882011-10-11 16:47:53 +11003423raid10_size(struct mddev *mddev, sector_t sectors, int raid_disks)
Dan Williams80c3a6c2009-03-17 18:10:40 -07003424{
3425 sector_t size;
NeilBrowne879a872011-10-11 16:49:02 +11003426 struct r10conf *conf = mddev->private;
Dan Williams80c3a6c2009-03-17 18:10:40 -07003427
3428 if (!raid_disks)
NeilBrown3ea7daa2012-05-22 13:53:47 +10003429 raid_disks = min(conf->geo.raid_disks,
3430 conf->prev.raid_disks);
Dan Williams80c3a6c2009-03-17 18:10:40 -07003431 if (!sectors)
Trela, Maciejdab8b292010-03-08 16:02:45 +11003432 sectors = conf->dev_sectors;
Dan Williams80c3a6c2009-03-17 18:10:40 -07003433
NeilBrown5cf00fc2012-05-21 09:28:20 +10003434 size = sectors >> conf->geo.chunk_shift;
3435 sector_div(size, conf->geo.far_copies);
Dan Williams80c3a6c2009-03-17 18:10:40 -07003436 size = size * raid_disks;
NeilBrown5cf00fc2012-05-21 09:28:20 +10003437 sector_div(size, conf->geo.near_copies);
Dan Williams80c3a6c2009-03-17 18:10:40 -07003438
NeilBrown5cf00fc2012-05-21 09:28:20 +10003439 return size << conf->geo.chunk_shift;
Dan Williams80c3a6c2009-03-17 18:10:40 -07003440}
3441
NeilBrown6508fdb2012-05-17 10:08:45 +10003442static void calc_sectors(struct r10conf *conf, sector_t size)
3443{
3444 /* Calculate the number of sectors-per-device that will
3445 * actually be used, and set conf->dev_sectors and
3446 * conf->stride
3447 */
3448
NeilBrown5cf00fc2012-05-21 09:28:20 +10003449 size = size >> conf->geo.chunk_shift;
3450 sector_div(size, conf->geo.far_copies);
3451 size = size * conf->geo.raid_disks;
3452 sector_div(size, conf->geo.near_copies);
NeilBrown6508fdb2012-05-17 10:08:45 +10003453 /* 'size' is now the number of chunks in the array */
3454 /* calculate "used chunks per device" */
3455 size = size * conf->copies;
3456
3457 /* We need to round up when dividing by raid_disks to
3458 * get the stride size.
3459 */
NeilBrown5cf00fc2012-05-21 09:28:20 +10003460 size = DIV_ROUND_UP_SECTOR_T(size, conf->geo.raid_disks);
NeilBrown6508fdb2012-05-17 10:08:45 +10003461
NeilBrown5cf00fc2012-05-21 09:28:20 +10003462 conf->dev_sectors = size << conf->geo.chunk_shift;
NeilBrown6508fdb2012-05-17 10:08:45 +10003463
NeilBrown5cf00fc2012-05-21 09:28:20 +10003464 if (conf->geo.far_offset)
3465 conf->geo.stride = 1 << conf->geo.chunk_shift;
NeilBrown6508fdb2012-05-17 10:08:45 +10003466 else {
NeilBrown5cf00fc2012-05-21 09:28:20 +10003467 sector_div(size, conf->geo.far_copies);
3468 conf->geo.stride = size << conf->geo.chunk_shift;
NeilBrown6508fdb2012-05-17 10:08:45 +10003469 }
3470}
Trela, Maciejdab8b292010-03-08 16:02:45 +11003471
NeilBrowndeb200d2012-05-21 09:28:33 +10003472enum geo_type {geo_new, geo_old, geo_start};
3473static int setup_geo(struct geom *geo, struct mddev *mddev, enum geo_type new)
3474{
3475 int nc, fc, fo;
3476 int layout, chunk, disks;
3477 switch (new) {
3478 case geo_old:
3479 layout = mddev->layout;
3480 chunk = mddev->chunk_sectors;
3481 disks = mddev->raid_disks - mddev->delta_disks;
3482 break;
3483 case geo_new:
3484 layout = mddev->new_layout;
3485 chunk = mddev->new_chunk_sectors;
3486 disks = mddev->raid_disks;
3487 break;
3488 default: /* avoid 'may be unused' warnings */
3489 case geo_start: /* new when starting reshape - raid_disks not
3490 * updated yet. */
3491 layout = mddev->new_layout;
3492 chunk = mddev->new_chunk_sectors;
3493 disks = mddev->raid_disks + mddev->delta_disks;
3494 break;
3495 }
Jonathan Brassow475901a2013-02-21 13:28:10 +11003496 if (layout >> 18)
NeilBrowndeb200d2012-05-21 09:28:33 +10003497 return -1;
3498 if (chunk < (PAGE_SIZE >> 9) ||
3499 !is_power_of_2(chunk))
3500 return -2;
3501 nc = layout & 255;
3502 fc = (layout >> 8) & 255;
3503 fo = layout & (1<<16);
3504 geo->raid_disks = disks;
3505 geo->near_copies = nc;
3506 geo->far_copies = fc;
3507 geo->far_offset = fo;
Jonathan Brassow475901a2013-02-21 13:28:10 +11003508 geo->far_set_size = (layout & (1<<17)) ? disks / fc : disks;
NeilBrowndeb200d2012-05-21 09:28:33 +10003509 geo->chunk_mask = chunk - 1;
3510 geo->chunk_shift = ffz(~chunk);
3511 return nc*fc;
3512}
3513
NeilBrowne879a872011-10-11 16:49:02 +11003514static struct r10conf *setup_conf(struct mddev *mddev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003515{
NeilBrowne879a872011-10-11 16:49:02 +11003516 struct r10conf *conf = NULL;
Trela, Maciejdab8b292010-03-08 16:02:45 +11003517 int err = -EINVAL;
NeilBrowndeb200d2012-05-21 09:28:33 +10003518 struct geom geo;
3519 int copies;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003520
NeilBrowndeb200d2012-05-21 09:28:33 +10003521 copies = setup_geo(&geo, mddev, geo_new);
3522
3523 if (copies == -2) {
NeilBrown128595e2010-05-03 14:47:14 +10003524 printk(KERN_ERR "md/raid10:%s: chunk size must be "
3525 "at least PAGE_SIZE(%ld) and be a power of 2.\n",
3526 mdname(mddev), PAGE_SIZE);
Trela, Maciejdab8b292010-03-08 16:02:45 +11003527 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003528 }
NeilBrown2604b702006-01-06 00:20:36 -08003529
NeilBrowndeb200d2012-05-21 09:28:33 +10003530 if (copies < 2 || copies > mddev->raid_disks) {
NeilBrown128595e2010-05-03 14:47:14 +10003531 printk(KERN_ERR "md/raid10:%s: unsupported raid10 layout: 0x%8x\n",
Maciej Trelaf73ea872010-06-16 11:46:29 +01003532 mdname(mddev), mddev->new_layout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003533 goto out;
3534 }
Trela, Maciejdab8b292010-03-08 16:02:45 +11003535
3536 err = -ENOMEM;
NeilBrowne879a872011-10-11 16:49:02 +11003537 conf = kzalloc(sizeof(struct r10conf), GFP_KERNEL);
Trela, Maciejdab8b292010-03-08 16:02:45 +11003538 if (!conf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003539 goto out;
Trela, Maciejdab8b292010-03-08 16:02:45 +11003540
NeilBrown3ea7daa2012-05-22 13:53:47 +10003541 /* FIXME calc properly */
Jonathan Brassowdc280d982012-07-31 10:03:52 +10003542 conf->mirrors = kzalloc(sizeof(struct raid10_info)*(mddev->raid_disks +
NeilBrown78eaa0d2013-07-02 15:58:05 +10003543 max(0,-mddev->delta_disks)),
Trela, Maciejdab8b292010-03-08 16:02:45 +11003544 GFP_KERNEL);
3545 if (!conf->mirrors)
3546 goto out;
NeilBrown4443ae12006-01-06 00:20:28 -08003547
3548 conf->tmppage = alloc_page(GFP_KERNEL);
3549 if (!conf->tmppage)
Trela, Maciejdab8b292010-03-08 16:02:45 +11003550 goto out;
3551
NeilBrowndeb200d2012-05-21 09:28:33 +10003552 conf->geo = geo;
3553 conf->copies = copies;
Trela, Maciejdab8b292010-03-08 16:02:45 +11003554 conf->r10bio_pool = mempool_create(NR_RAID10_BIOS, r10bio_pool_alloc,
3555 r10bio_pool_free, conf);
3556 if (!conf->r10bio_pool)
3557 goto out;
3558
NeilBrown6508fdb2012-05-17 10:08:45 +10003559 calc_sectors(conf, mddev->dev_sectors);
NeilBrown3ea7daa2012-05-22 13:53:47 +10003560 if (mddev->reshape_position == MaxSector) {
3561 conf->prev = conf->geo;
3562 conf->reshape_progress = MaxSector;
3563 } else {
3564 if (setup_geo(&conf->prev, mddev, geo_old) != conf->copies) {
3565 err = -EINVAL;
3566 goto out;
3567 }
3568 conf->reshape_progress = mddev->reshape_position;
3569 if (conf->prev.far_offset)
3570 conf->prev.stride = 1 << conf->prev.chunk_shift;
3571 else
3572 /* far_copies must be 1 */
3573 conf->prev.stride = conf->dev_sectors;
3574 }
Neil Browne7e72bf2008-05-14 16:05:54 -07003575 spin_lock_init(&conf->device_lock);
Trela, Maciejdab8b292010-03-08 16:02:45 +11003576 INIT_LIST_HEAD(&conf->retry_list);
3577
3578 spin_lock_init(&conf->resync_lock);
3579 init_waitqueue_head(&conf->wait_barrier);
3580
NeilBrown02326052012-07-03 15:56:52 +10003581 conf->thread = md_register_thread(raid10d, mddev, "raid10");
Trela, Maciejdab8b292010-03-08 16:02:45 +11003582 if (!conf->thread)
3583 goto out;
3584
Trela, Maciejdab8b292010-03-08 16:02:45 +11003585 conf->mddev = mddev;
3586 return conf;
3587
3588 out:
NeilBrown3ea7daa2012-05-22 13:53:47 +10003589 if (err == -ENOMEM)
3590 printk(KERN_ERR "md/raid10:%s: couldn't allocate memory.\n",
3591 mdname(mddev));
Trela, Maciejdab8b292010-03-08 16:02:45 +11003592 if (conf) {
3593 if (conf->r10bio_pool)
3594 mempool_destroy(conf->r10bio_pool);
3595 kfree(conf->mirrors);
3596 safe_put_page(conf->tmppage);
3597 kfree(conf);
3598 }
3599 return ERR_PTR(err);
3600}
3601
NeilBrownfd01b882011-10-11 16:47:53 +11003602static int run(struct mddev *mddev)
Trela, Maciejdab8b292010-03-08 16:02:45 +11003603{
NeilBrowne879a872011-10-11 16:49:02 +11003604 struct r10conf *conf;
Trela, Maciejdab8b292010-03-08 16:02:45 +11003605 int i, disk_idx, chunk_size;
Jonathan Brassowdc280d982012-07-31 10:03:52 +10003606 struct raid10_info *disk;
NeilBrown3cb03002011-10-11 16:45:26 +11003607 struct md_rdev *rdev;
Trela, Maciejdab8b292010-03-08 16:02:45 +11003608 sector_t size;
NeilBrown3ea7daa2012-05-22 13:53:47 +10003609 sector_t min_offset_diff = 0;
3610 int first = 1;
Shaohua Li532a2a32012-10-11 13:30:52 +11003611 bool discard_supported = false;
Trela, Maciejdab8b292010-03-08 16:02:45 +11003612
3613 if (mddev->private == NULL) {
3614 conf = setup_conf(mddev);
3615 if (IS_ERR(conf))
3616 return PTR_ERR(conf);
3617 mddev->private = conf;
3618 }
3619 conf = mddev->private;
3620 if (!conf)
3621 goto out;
3622
Trela, Maciejdab8b292010-03-08 16:02:45 +11003623 mddev->thread = conf->thread;
3624 conf->thread = NULL;
3625
Martin K. Petersen8f6c2e42009-07-01 11:13:45 +10003626 chunk_size = mddev->chunk_sectors << 9;
Jonathan Brassowcc4d1ef2012-07-31 10:03:53 +10003627 if (mddev->queue) {
Shaohua Li532a2a32012-10-11 13:30:52 +11003628 blk_queue_max_discard_sectors(mddev->queue,
3629 mddev->chunk_sectors);
H. Peter Anvin5026d7a2013-06-12 07:37:43 -07003630 blk_queue_max_write_same_sectors(mddev->queue, 0);
Jonathan Brassowcc4d1ef2012-07-31 10:03:53 +10003631 blk_queue_io_min(mddev->queue, chunk_size);
3632 if (conf->geo.raid_disks % conf->geo.near_copies)
3633 blk_queue_io_opt(mddev->queue, chunk_size * conf->geo.raid_disks);
3634 else
3635 blk_queue_io_opt(mddev->queue, chunk_size *
3636 (conf->geo.raid_disks / conf->geo.near_copies));
3637 }
Martin K. Petersen8f6c2e42009-07-01 11:13:45 +10003638
NeilBrowndafb20f2012-03-19 12:46:39 +11003639 rdev_for_each(rdev, mddev) {
NeilBrown3ea7daa2012-05-22 13:53:47 +10003640 long long diff;
NeilBrownaba336b2012-05-31 15:39:11 +10003641 struct request_queue *q;
NeilBrown34b343c2011-07-28 11:31:47 +10003642
Linus Torvalds1da177e2005-04-16 15:20:36 -07003643 disk_idx = rdev->raid_disk;
NeilBrownf8c9e742012-05-21 09:28:33 +10003644 if (disk_idx < 0)
3645 continue;
3646 if (disk_idx >= conf->geo.raid_disks &&
3647 disk_idx >= conf->prev.raid_disks)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003648 continue;
3649 disk = conf->mirrors + disk_idx;
3650
NeilBrown56a25592011-12-23 10:17:55 +11003651 if (test_bit(Replacement, &rdev->flags)) {
3652 if (disk->replacement)
3653 goto out_free_conf;
3654 disk->replacement = rdev;
3655 } else {
3656 if (disk->rdev)
3657 goto out_free_conf;
3658 disk->rdev = rdev;
3659 }
NeilBrownaba336b2012-05-31 15:39:11 +10003660 q = bdev_get_queue(rdev->bdev);
3661 if (q->merge_bvec_fn)
3662 mddev->merge_check_needed = 1;
NeilBrown3ea7daa2012-05-22 13:53:47 +10003663 diff = (rdev->new_data_offset - rdev->data_offset);
3664 if (!mddev->reshape_backwards)
3665 diff = -diff;
3666 if (diff < 0)
3667 diff = 0;
3668 if (first || diff < min_offset_diff)
3669 min_offset_diff = diff;
NeilBrown56a25592011-12-23 10:17:55 +11003670
Jonathan Brassowcc4d1ef2012-07-31 10:03:53 +10003671 if (mddev->gendisk)
3672 disk_stack_limits(mddev->gendisk, rdev->bdev,
3673 rdev->data_offset << 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003674
3675 disk->head_position = 0;
Shaohua Li532a2a32012-10-11 13:30:52 +11003676
3677 if (blk_queue_discard(bdev_get_queue(rdev->bdev)))
3678 discard_supported = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003679 }
NeilBrown3ea7daa2012-05-22 13:53:47 +10003680
Jonathan Brassowed30be02012-10-31 11:42:30 +11003681 if (mddev->queue) {
3682 if (discard_supported)
3683 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD,
3684 mddev->queue);
3685 else
3686 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD,
3687 mddev->queue);
3688 }
NeilBrown6d508242005-09-09 16:24:03 -07003689 /* need to check that every block has at least one working mirror */
NeilBrown700c7212011-07-27 11:00:36 +10003690 if (!enough(conf, -1)) {
NeilBrown128595e2010-05-03 14:47:14 +10003691 printk(KERN_ERR "md/raid10:%s: not enough operational mirrors.\n",
NeilBrown6d508242005-09-09 16:24:03 -07003692 mdname(mddev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003693 goto out_free_conf;
3694 }
3695
NeilBrown3ea7daa2012-05-22 13:53:47 +10003696 if (conf->reshape_progress != MaxSector) {
3697 /* must ensure that shape change is supported */
3698 if (conf->geo.far_copies != 1 &&
3699 conf->geo.far_offset == 0)
3700 goto out_free_conf;
3701 if (conf->prev.far_copies != 1 &&
NeilBrown78eaa0d2013-07-02 15:58:05 +10003702 conf->prev.far_offset == 0)
NeilBrown3ea7daa2012-05-22 13:53:47 +10003703 goto out_free_conf;
3704 }
3705
Linus Torvalds1da177e2005-04-16 15:20:36 -07003706 mddev->degraded = 0;
NeilBrownf8c9e742012-05-21 09:28:33 +10003707 for (i = 0;
3708 i < conf->geo.raid_disks
3709 || i < conf->prev.raid_disks;
3710 i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003711
3712 disk = conf->mirrors + i;
3713
NeilBrown56a25592011-12-23 10:17:55 +11003714 if (!disk->rdev && disk->replacement) {
3715 /* The replacement is all we have - use it */
3716 disk->rdev = disk->replacement;
3717 disk->replacement = NULL;
3718 clear_bit(Replacement, &disk->rdev->flags);
3719 }
3720
NeilBrown5fd6c1d2006-06-26 00:27:40 -07003721 if (!disk->rdev ||
NeilBrown2e333e82006-10-21 10:24:07 -07003722 !test_bit(In_sync, &disk->rdev->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003723 disk->head_position = 0;
3724 mddev->degraded++;
NeilBrown0b59bb62014-01-14 16:30:10 +11003725 if (disk->rdev &&
3726 disk->rdev->saved_raid_disk < 0)
Neil Brown8c2e8702008-06-28 08:30:52 +10003727 conf->fullsync = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003728 }
NeilBrownd890fa22011-10-26 11:54:39 +11003729 disk->recovery_disabled = mddev->recovery_disabled - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003730 }
3731
Andre Noll8c6ac862009-06-18 08:48:06 +10003732 if (mddev->recovery_cp != MaxSector)
NeilBrown128595e2010-05-03 14:47:14 +10003733 printk(KERN_NOTICE "md/raid10:%s: not clean"
Andre Noll8c6ac862009-06-18 08:48:06 +10003734 " -- starting background reconstruction\n",
3735 mdname(mddev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003736 printk(KERN_INFO
NeilBrown128595e2010-05-03 14:47:14 +10003737 "md/raid10:%s: active with %d out of %d devices\n",
NeilBrown5cf00fc2012-05-21 09:28:20 +10003738 mdname(mddev), conf->geo.raid_disks - mddev->degraded,
3739 conf->geo.raid_disks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003740 /*
3741 * Ok, everything is just fine now
3742 */
Trela, Maciejdab8b292010-03-08 16:02:45 +11003743 mddev->dev_sectors = conf->dev_sectors;
3744 size = raid10_size(mddev, 0, 0);
3745 md_set_array_sectors(mddev, size);
3746 mddev->resync_max_sectors = size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003747
Jonathan Brassowcc4d1ef2012-07-31 10:03:53 +10003748 if (mddev->queue) {
NeilBrown5cf00fc2012-05-21 09:28:20 +10003749 int stripe = conf->geo.raid_disks *
Andre Noll9d8f0362009-06-18 08:45:01 +10003750 ((mddev->chunk_sectors << 9) / PAGE_SIZE);
Jonathan Brassowcc4d1ef2012-07-31 10:03:53 +10003751
3752 /* Calculate max read-ahead size.
3753 * We need to readahead at least twice a whole stripe....
3754 * maybe...
3755 */
NeilBrown5cf00fc2012-05-21 09:28:20 +10003756 stripe /= conf->geo.near_copies;
NeilBrown3ea7daa2012-05-22 13:53:47 +10003757 if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe)
3758 mddev->queue->backing_dev_info.ra_pages = 2 * stripe;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003759 }
3760
Martin K. Petersena91a2782011-03-17 11:11:05 +01003761 if (md_integrity_register(mddev))
3762 goto out_free_conf;
3763
NeilBrown3ea7daa2012-05-22 13:53:47 +10003764 if (conf->reshape_progress != MaxSector) {
3765 unsigned long before_length, after_length;
3766
3767 before_length = ((1 << conf->prev.chunk_shift) *
3768 conf->prev.far_copies);
3769 after_length = ((1 << conf->geo.chunk_shift) *
3770 conf->geo.far_copies);
3771
3772 if (max(before_length, after_length) > min_offset_diff) {
3773 /* This cannot work */
3774 printk("md/raid10: offset difference not enough to continue reshape\n");
3775 goto out_free_conf;
3776 }
3777 conf->offset_diff = min_offset_diff;
3778
3779 conf->reshape_safe = conf->reshape_progress;
3780 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3781 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3782 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
3783 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3784 mddev->sync_thread = md_register_thread(md_do_sync, mddev,
3785 "reshape");
3786 }
3787
Linus Torvalds1da177e2005-04-16 15:20:36 -07003788 return 0;
3789
3790out_free_conf:
NeilBrown01f96c02011-09-21 15:30:20 +10003791 md_unregister_thread(&mddev->thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003792 if (conf->r10bio_pool)
3793 mempool_destroy(conf->r10bio_pool);
NeilBrown1345b1d2006-01-06 00:20:40 -08003794 safe_put_page(conf->tmppage);
Jesper Juhl990a8ba2005-06-21 17:17:30 -07003795 kfree(conf->mirrors);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003796 kfree(conf);
3797 mddev->private = NULL;
3798out:
3799 return -EIO;
3800}
3801
NeilBrownafa0f552014-12-15 12:56:58 +11003802static void raid10_free(struct mddev *mddev, void *priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003803{
NeilBrownafa0f552014-12-15 12:56:58 +11003804 struct r10conf *conf = priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003805
Linus Torvalds1da177e2005-04-16 15:20:36 -07003806 if (conf->r10bio_pool)
3807 mempool_destroy(conf->r10bio_pool);
Hirokazu Takahashi0fea7ed2013-04-24 11:42:44 +10003808 safe_put_page(conf->tmppage);
Jesper Juhl990a8ba2005-06-21 17:17:30 -07003809 kfree(conf->mirrors);
NeilBrownc4796e22014-08-23 20:19:26 +10003810 kfree(conf->mirrors_old);
3811 kfree(conf->mirrors_new);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003812 kfree(conf);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003813}
3814
NeilBrownfd01b882011-10-11 16:47:53 +11003815static void raid10_quiesce(struct mddev *mddev, int state)
NeilBrown6cce3b232006-01-06 00:20:16 -08003816{
NeilBrowne879a872011-10-11 16:49:02 +11003817 struct r10conf *conf = mddev->private;
NeilBrown6cce3b232006-01-06 00:20:16 -08003818
3819 switch(state) {
3820 case 1:
3821 raise_barrier(conf, 0);
3822 break;
3823 case 0:
3824 lower_barrier(conf);
3825 break;
3826 }
NeilBrown6cce3b232006-01-06 00:20:16 -08003827}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003828
NeilBrown006a09a2012-03-19 12:46:40 +11003829static int raid10_resize(struct mddev *mddev, sector_t sectors)
3830{
3831 /* Resize of 'far' arrays is not supported.
3832 * For 'near' and 'offset' arrays we can set the
3833 * number of sectors used to be an appropriate multiple
3834 * of the chunk size.
3835 * For 'offset', this is far_copies*chunksize.
3836 * For 'near' the multiplier is the LCM of
3837 * near_copies and raid_disks.
3838 * So if far_copies > 1 && !far_offset, fail.
3839 * Else find LCM(raid_disks, near_copy)*far_copies and
3840 * multiply by chunk_size. Then round to this number.
3841 * This is mostly done by raid10_size()
3842 */
3843 struct r10conf *conf = mddev->private;
3844 sector_t oldsize, size;
3845
NeilBrownf8c9e742012-05-21 09:28:33 +10003846 if (mddev->reshape_position != MaxSector)
3847 return -EBUSY;
3848
NeilBrown5cf00fc2012-05-21 09:28:20 +10003849 if (conf->geo.far_copies > 1 && !conf->geo.far_offset)
NeilBrown006a09a2012-03-19 12:46:40 +11003850 return -EINVAL;
3851
3852 oldsize = raid10_size(mddev, 0, 0);
3853 size = raid10_size(mddev, sectors, 0);
NeilBrowna4a61252012-05-22 13:55:27 +10003854 if (mddev->external_size &&
3855 mddev->array_sectors > size)
NeilBrown006a09a2012-03-19 12:46:40 +11003856 return -EINVAL;
NeilBrowna4a61252012-05-22 13:55:27 +10003857 if (mddev->bitmap) {
3858 int ret = bitmap_resize(mddev->bitmap, size, 0, 0);
3859 if (ret)
3860 return ret;
3861 }
3862 md_set_array_sectors(mddev, size);
NeilBrown006a09a2012-03-19 12:46:40 +11003863 set_capacity(mddev->gendisk, mddev->array_sectors);
3864 revalidate_disk(mddev->gendisk);
3865 if (sectors > mddev->dev_sectors &&
3866 mddev->recovery_cp > oldsize) {
3867 mddev->recovery_cp = oldsize;
3868 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3869 }
NeilBrown6508fdb2012-05-17 10:08:45 +10003870 calc_sectors(conf, sectors);
3871 mddev->dev_sectors = conf->dev_sectors;
NeilBrown006a09a2012-03-19 12:46:40 +11003872 mddev->resync_max_sectors = size;
3873 return 0;
3874}
3875
NeilBrown53a6ab42015-02-12 14:09:57 +11003876static void *raid10_takeover_raid0(struct mddev *mddev, sector_t size, int devs)
Trela, Maciejdab8b292010-03-08 16:02:45 +11003877{
NeilBrown3cb03002011-10-11 16:45:26 +11003878 struct md_rdev *rdev;
NeilBrowne879a872011-10-11 16:49:02 +11003879 struct r10conf *conf;
Trela, Maciejdab8b292010-03-08 16:02:45 +11003880
3881 if (mddev->degraded > 0) {
NeilBrown128595e2010-05-03 14:47:14 +10003882 printk(KERN_ERR "md/raid10:%s: Error: degraded raid0!\n",
3883 mdname(mddev));
Trela, Maciejdab8b292010-03-08 16:02:45 +11003884 return ERR_PTR(-EINVAL);
3885 }
NeilBrown53a6ab42015-02-12 14:09:57 +11003886 sector_div(size, devs);
Trela, Maciejdab8b292010-03-08 16:02:45 +11003887
Trela, Maciejdab8b292010-03-08 16:02:45 +11003888 /* Set new parameters */
3889 mddev->new_level = 10;
3890 /* new layout: far_copies = 1, near_copies = 2 */
3891 mddev->new_layout = (1<<8) + 2;
3892 mddev->new_chunk_sectors = mddev->chunk_sectors;
3893 mddev->delta_disks = mddev->raid_disks;
Trela, Maciejdab8b292010-03-08 16:02:45 +11003894 mddev->raid_disks *= 2;
3895 /* make sure it will be not marked as dirty */
3896 mddev->recovery_cp = MaxSector;
NeilBrown53a6ab42015-02-12 14:09:57 +11003897 mddev->dev_sectors = size;
Trela, Maciejdab8b292010-03-08 16:02:45 +11003898
3899 conf = setup_conf(mddev);
Krzysztof Wojcik02214dc2011-02-04 14:18:26 +01003900 if (!IS_ERR(conf)) {
NeilBrowndafb20f2012-03-19 12:46:39 +11003901 rdev_for_each(rdev, mddev)
NeilBrown53a6ab42015-02-12 14:09:57 +11003902 if (rdev->raid_disk >= 0) {
NeilBrowne93f68a2010-06-15 09:36:03 +01003903 rdev->new_raid_disk = rdev->raid_disk * 2;
NeilBrown53a6ab42015-02-12 14:09:57 +11003904 rdev->sectors = size;
3905 }
Krzysztof Wojcik02214dc2011-02-04 14:18:26 +01003906 conf->barrier = 1;
3907 }
3908
Trela, Maciejdab8b292010-03-08 16:02:45 +11003909 return conf;
3910}
3911
NeilBrownfd01b882011-10-11 16:47:53 +11003912static void *raid10_takeover(struct mddev *mddev)
Trela, Maciejdab8b292010-03-08 16:02:45 +11003913{
NeilBrowne373ab12011-10-11 16:48:59 +11003914 struct r0conf *raid0_conf;
Trela, Maciejdab8b292010-03-08 16:02:45 +11003915
3916 /* raid10 can take over:
3917 * raid0 - providing it has only two drives
3918 */
3919 if (mddev->level == 0) {
3920 /* for raid0 takeover only one zone is supported */
NeilBrowne373ab12011-10-11 16:48:59 +11003921 raid0_conf = mddev->private;
3922 if (raid0_conf->nr_strip_zones > 1) {
NeilBrown128595e2010-05-03 14:47:14 +10003923 printk(KERN_ERR "md/raid10:%s: cannot takeover raid 0"
3924 " with more than one zone.\n",
3925 mdname(mddev));
Trela, Maciejdab8b292010-03-08 16:02:45 +11003926 return ERR_PTR(-EINVAL);
3927 }
NeilBrown53a6ab42015-02-12 14:09:57 +11003928 return raid10_takeover_raid0(mddev,
3929 raid0_conf->strip_zone->zone_end,
3930 raid0_conf->strip_zone->nb_dev);
Trela, Maciejdab8b292010-03-08 16:02:45 +11003931 }
3932 return ERR_PTR(-EINVAL);
3933}
3934
NeilBrown3ea7daa2012-05-22 13:53:47 +10003935static int raid10_check_reshape(struct mddev *mddev)
3936{
3937 /* Called when there is a request to change
3938 * - layout (to ->new_layout)
3939 * - chunk size (to ->new_chunk_sectors)
3940 * - raid_disks (by delta_disks)
3941 * or when trying to restart a reshape that was ongoing.
3942 *
3943 * We need to validate the request and possibly allocate
3944 * space if that might be an issue later.
3945 *
3946 * Currently we reject any reshape of a 'far' mode array,
3947 * allow chunk size to change if new is generally acceptable,
3948 * allow raid_disks to increase, and allow
3949 * a switch between 'near' mode and 'offset' mode.
3950 */
3951 struct r10conf *conf = mddev->private;
3952 struct geom geo;
3953
3954 if (conf->geo.far_copies != 1 && !conf->geo.far_offset)
3955 return -EINVAL;
3956
3957 if (setup_geo(&geo, mddev, geo_start) != conf->copies)
3958 /* mustn't change number of copies */
3959 return -EINVAL;
3960 if (geo.far_copies > 1 && !geo.far_offset)
3961 /* Cannot switch to 'far' mode */
3962 return -EINVAL;
3963
3964 if (mddev->array_sectors & geo.chunk_mask)
3965 /* not factor of array size */
3966 return -EINVAL;
3967
NeilBrown3ea7daa2012-05-22 13:53:47 +10003968 if (!enough(conf, -1))
3969 return -EINVAL;
3970
3971 kfree(conf->mirrors_new);
3972 conf->mirrors_new = NULL;
3973 if (mddev->delta_disks > 0) {
3974 /* allocate new 'mirrors' list */
3975 conf->mirrors_new = kzalloc(
Jonathan Brassowdc280d982012-07-31 10:03:52 +10003976 sizeof(struct raid10_info)
NeilBrown3ea7daa2012-05-22 13:53:47 +10003977 *(mddev->raid_disks +
3978 mddev->delta_disks),
3979 GFP_KERNEL);
3980 if (!conf->mirrors_new)
3981 return -ENOMEM;
3982 }
3983 return 0;
3984}
3985
3986/*
3987 * Need to check if array has failed when deciding whether to:
3988 * - start an array
3989 * - remove non-faulty devices
3990 * - add a spare
3991 * - allow a reshape
3992 * This determination is simple when no reshape is happening.
3993 * However if there is a reshape, we need to carefully check
3994 * both the before and after sections.
3995 * This is because some failed devices may only affect one
3996 * of the two sections, and some non-in_sync devices may
3997 * be insync in the section most affected by failed devices.
3998 */
3999static int calc_degraded(struct r10conf *conf)
4000{
4001 int degraded, degraded2;
4002 int i;
4003
4004 rcu_read_lock();
4005 degraded = 0;
4006 /* 'prev' section first */
4007 for (i = 0; i < conf->prev.raid_disks; i++) {
4008 struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev);
4009 if (!rdev || test_bit(Faulty, &rdev->flags))
4010 degraded++;
4011 else if (!test_bit(In_sync, &rdev->flags))
4012 /* When we can reduce the number of devices in
4013 * an array, this might not contribute to
4014 * 'degraded'. It does now.
4015 */
4016 degraded++;
4017 }
4018 rcu_read_unlock();
4019 if (conf->geo.raid_disks == conf->prev.raid_disks)
4020 return degraded;
4021 rcu_read_lock();
4022 degraded2 = 0;
4023 for (i = 0; i < conf->geo.raid_disks; i++) {
4024 struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev);
4025 if (!rdev || test_bit(Faulty, &rdev->flags))
4026 degraded2++;
4027 else if (!test_bit(In_sync, &rdev->flags)) {
4028 /* If reshape is increasing the number of devices,
4029 * this section has already been recovered, so
4030 * it doesn't contribute to degraded.
4031 * else it does.
4032 */
4033 if (conf->geo.raid_disks <= conf->prev.raid_disks)
4034 degraded2++;
4035 }
4036 }
4037 rcu_read_unlock();
4038 if (degraded2 > degraded)
4039 return degraded2;
4040 return degraded;
4041}
4042
4043static int raid10_start_reshape(struct mddev *mddev)
4044{
4045 /* A 'reshape' has been requested. This commits
4046 * the various 'new' fields and sets MD_RECOVER_RESHAPE
4047 * This also checks if there are enough spares and adds them
4048 * to the array.
4049 * We currently require enough spares to make the final
4050 * array non-degraded. We also require that the difference
4051 * between old and new data_offset - on each device - is
4052 * enough that we never risk over-writing.
4053 */
4054
4055 unsigned long before_length, after_length;
4056 sector_t min_offset_diff = 0;
4057 int first = 1;
4058 struct geom new;
4059 struct r10conf *conf = mddev->private;
4060 struct md_rdev *rdev;
4061 int spares = 0;
NeilBrownbb63a702012-05-22 13:55:28 +10004062 int ret;
NeilBrown3ea7daa2012-05-22 13:53:47 +10004063
4064 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4065 return -EBUSY;
4066
4067 if (setup_geo(&new, mddev, geo_start) != conf->copies)
4068 return -EINVAL;
4069
4070 before_length = ((1 << conf->prev.chunk_shift) *
4071 conf->prev.far_copies);
4072 after_length = ((1 << conf->geo.chunk_shift) *
4073 conf->geo.far_copies);
4074
4075 rdev_for_each(rdev, mddev) {
4076 if (!test_bit(In_sync, &rdev->flags)
4077 && !test_bit(Faulty, &rdev->flags))
4078 spares++;
4079 if (rdev->raid_disk >= 0) {
4080 long long diff = (rdev->new_data_offset
4081 - rdev->data_offset);
4082 if (!mddev->reshape_backwards)
4083 diff = -diff;
4084 if (diff < 0)
4085 diff = 0;
4086 if (first || diff < min_offset_diff)
4087 min_offset_diff = diff;
4088 }
4089 }
4090
4091 if (max(before_length, after_length) > min_offset_diff)
4092 return -EINVAL;
4093
4094 if (spares < mddev->delta_disks)
4095 return -EINVAL;
4096
4097 conf->offset_diff = min_offset_diff;
4098 spin_lock_irq(&conf->device_lock);
4099 if (conf->mirrors_new) {
4100 memcpy(conf->mirrors_new, conf->mirrors,
Jonathan Brassowdc280d982012-07-31 10:03:52 +10004101 sizeof(struct raid10_info)*conf->prev.raid_disks);
NeilBrown3ea7daa2012-05-22 13:53:47 +10004102 smp_mb();
NeilBrownc4796e22014-08-23 20:19:26 +10004103 kfree(conf->mirrors_old);
NeilBrown3ea7daa2012-05-22 13:53:47 +10004104 conf->mirrors_old = conf->mirrors;
4105 conf->mirrors = conf->mirrors_new;
4106 conf->mirrors_new = NULL;
4107 }
4108 setup_geo(&conf->geo, mddev, geo_start);
4109 smp_mb();
4110 if (mddev->reshape_backwards) {
4111 sector_t size = raid10_size(mddev, 0, 0);
4112 if (size < mddev->array_sectors) {
4113 spin_unlock_irq(&conf->device_lock);
4114 printk(KERN_ERR "md/raid10:%s: array size must be reduce before number of disks\n",
4115 mdname(mddev));
4116 return -EINVAL;
4117 }
4118 mddev->resync_max_sectors = size;
4119 conf->reshape_progress = size;
4120 } else
4121 conf->reshape_progress = 0;
4122 spin_unlock_irq(&conf->device_lock);
4123
NeilBrownbb63a702012-05-22 13:55:28 +10004124 if (mddev->delta_disks && mddev->bitmap) {
4125 ret = bitmap_resize(mddev->bitmap,
4126 raid10_size(mddev, 0,
4127 conf->geo.raid_disks),
4128 0, 0);
4129 if (ret)
4130 goto abort;
4131 }
NeilBrown3ea7daa2012-05-22 13:53:47 +10004132 if (mddev->delta_disks > 0) {
4133 rdev_for_each(rdev, mddev)
4134 if (rdev->raid_disk < 0 &&
4135 !test_bit(Faulty, &rdev->flags)) {
4136 if (raid10_add_disk(mddev, rdev) == 0) {
4137 if (rdev->raid_disk >=
4138 conf->prev.raid_disks)
4139 set_bit(In_sync, &rdev->flags);
4140 else
4141 rdev->recovery_offset = 0;
4142
4143 if (sysfs_link_rdev(mddev, rdev))
4144 /* Failure here is OK */;
4145 }
4146 } else if (rdev->raid_disk >= conf->prev.raid_disks
4147 && !test_bit(Faulty, &rdev->flags)) {
4148 /* This is a spare that was manually added */
4149 set_bit(In_sync, &rdev->flags);
4150 }
4151 }
4152 /* When a reshape changes the number of devices,
4153 * ->degraded is measured against the larger of the
4154 * pre and post numbers.
4155 */
4156 spin_lock_irq(&conf->device_lock);
4157 mddev->degraded = calc_degraded(conf);
4158 spin_unlock_irq(&conf->device_lock);
4159 mddev->raid_disks = conf->geo.raid_disks;
4160 mddev->reshape_position = conf->reshape_progress;
4161 set_bit(MD_CHANGE_DEVS, &mddev->flags);
4162
4163 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4164 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4165 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
4166 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
4167
4168 mddev->sync_thread = md_register_thread(md_do_sync, mddev,
4169 "reshape");
4170 if (!mddev->sync_thread) {
NeilBrownbb63a702012-05-22 13:55:28 +10004171 ret = -EAGAIN;
4172 goto abort;
NeilBrown3ea7daa2012-05-22 13:53:47 +10004173 }
4174 conf->reshape_checkpoint = jiffies;
4175 md_wakeup_thread(mddev->sync_thread);
4176 md_new_event(mddev);
4177 return 0;
NeilBrownbb63a702012-05-22 13:55:28 +10004178
4179abort:
4180 mddev->recovery = 0;
4181 spin_lock_irq(&conf->device_lock);
4182 conf->geo = conf->prev;
4183 mddev->raid_disks = conf->geo.raid_disks;
4184 rdev_for_each(rdev, mddev)
4185 rdev->new_data_offset = rdev->data_offset;
4186 smp_wmb();
4187 conf->reshape_progress = MaxSector;
4188 mddev->reshape_position = MaxSector;
4189 spin_unlock_irq(&conf->device_lock);
4190 return ret;
NeilBrown3ea7daa2012-05-22 13:53:47 +10004191}
4192
4193/* Calculate the last device-address that could contain
4194 * any block from the chunk that includes the array-address 's'
4195 * and report the next address.
4196 * i.e. the address returned will be chunk-aligned and after
4197 * any data that is in the chunk containing 's'.
4198 */
4199static sector_t last_dev_address(sector_t s, struct geom *geo)
4200{
4201 s = (s | geo->chunk_mask) + 1;
4202 s >>= geo->chunk_shift;
4203 s *= geo->near_copies;
4204 s = DIV_ROUND_UP_SECTOR_T(s, geo->raid_disks);
4205 s *= geo->far_copies;
4206 s <<= geo->chunk_shift;
4207 return s;
4208}
4209
4210/* Calculate the first device-address that could contain
4211 * any block from the chunk that includes the array-address 's'.
4212 * This too will be the start of a chunk
4213 */
4214static sector_t first_dev_address(sector_t s, struct geom *geo)
4215{
4216 s >>= geo->chunk_shift;
4217 s *= geo->near_copies;
4218 sector_div(s, geo->raid_disks);
4219 s *= geo->far_copies;
4220 s <<= geo->chunk_shift;
4221 return s;
4222}
4223
4224static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr,
4225 int *skipped)
4226{
4227 /* We simply copy at most one chunk (smallest of old and new)
4228 * at a time, possibly less if that exceeds RESYNC_PAGES,
4229 * or we hit a bad block or something.
4230 * This might mean we pause for normal IO in the middle of
4231 * a chunk, but that is not a problem was mddev->reshape_position
4232 * can record any location.
4233 *
4234 * If we will want to write to a location that isn't
4235 * yet recorded as 'safe' (i.e. in metadata on disk) then
4236 * we need to flush all reshape requests and update the metadata.
4237 *
4238 * When reshaping forwards (e.g. to more devices), we interpret
4239 * 'safe' as the earliest block which might not have been copied
4240 * down yet. We divide this by previous stripe size and multiply
4241 * by previous stripe length to get lowest device offset that we
4242 * cannot write to yet.
4243 * We interpret 'sector_nr' as an address that we want to write to.
4244 * From this we use last_device_address() to find where we might
4245 * write to, and first_device_address on the 'safe' position.
4246 * If this 'next' write position is after the 'safe' position,
4247 * we must update the metadata to increase the 'safe' position.
4248 *
4249 * When reshaping backwards, we round in the opposite direction
4250 * and perform the reverse test: next write position must not be
4251 * less than current safe position.
4252 *
4253 * In all this the minimum difference in data offsets
4254 * (conf->offset_diff - always positive) allows a bit of slack,
4255 * so next can be after 'safe', but not by more than offset_disk
4256 *
4257 * We need to prepare all the bios here before we start any IO
4258 * to ensure the size we choose is acceptable to all devices.
4259 * The means one for each copy for write-out and an extra one for
4260 * read-in.
4261 * We store the read-in bio in ->master_bio and the others in
4262 * ->devs[x].bio and ->devs[x].repl_bio.
4263 */
4264 struct r10conf *conf = mddev->private;
4265 struct r10bio *r10_bio;
4266 sector_t next, safe, last;
4267 int max_sectors;
4268 int nr_sectors;
4269 int s;
4270 struct md_rdev *rdev;
4271 int need_flush = 0;
4272 struct bio *blist;
4273 struct bio *bio, *read_bio;
4274 int sectors_done = 0;
4275
4276 if (sector_nr == 0) {
4277 /* If restarting in the middle, skip the initial sectors */
4278 if (mddev->reshape_backwards &&
4279 conf->reshape_progress < raid10_size(mddev, 0, 0)) {
4280 sector_nr = (raid10_size(mddev, 0, 0)
4281 - conf->reshape_progress);
4282 } else if (!mddev->reshape_backwards &&
4283 conf->reshape_progress > 0)
4284 sector_nr = conf->reshape_progress;
4285 if (sector_nr) {
4286 mddev->curr_resync_completed = sector_nr;
4287 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
4288 *skipped = 1;
4289 return sector_nr;
4290 }
4291 }
4292
4293 /* We don't use sector_nr to track where we are up to
4294 * as that doesn't work well for ->reshape_backwards.
4295 * So just use ->reshape_progress.
4296 */
4297 if (mddev->reshape_backwards) {
4298 /* 'next' is the earliest device address that we might
4299 * write to for this chunk in the new layout
4300 */
4301 next = first_dev_address(conf->reshape_progress - 1,
4302 &conf->geo);
4303
4304 /* 'safe' is the last device address that we might read from
4305 * in the old layout after a restart
4306 */
4307 safe = last_dev_address(conf->reshape_safe - 1,
4308 &conf->prev);
4309
4310 if (next + conf->offset_diff < safe)
4311 need_flush = 1;
4312
4313 last = conf->reshape_progress - 1;
4314 sector_nr = last & ~(sector_t)(conf->geo.chunk_mask
4315 & conf->prev.chunk_mask);
4316 if (sector_nr + RESYNC_BLOCK_SIZE/512 < last)
4317 sector_nr = last + 1 - RESYNC_BLOCK_SIZE/512;
4318 } else {
4319 /* 'next' is after the last device address that we
4320 * might write to for this chunk in the new layout
4321 */
4322 next = last_dev_address(conf->reshape_progress, &conf->geo);
4323
4324 /* 'safe' is the earliest device address that we might
4325 * read from in the old layout after a restart
4326 */
4327 safe = first_dev_address(conf->reshape_safe, &conf->prev);
4328
4329 /* Need to update metadata if 'next' might be beyond 'safe'
4330 * as that would possibly corrupt data
4331 */
4332 if (next > safe + conf->offset_diff)
4333 need_flush = 1;
4334
4335 sector_nr = conf->reshape_progress;
4336 last = sector_nr | (conf->geo.chunk_mask
4337 & conf->prev.chunk_mask);
4338
4339 if (sector_nr + RESYNC_BLOCK_SIZE/512 <= last)
4340 last = sector_nr + RESYNC_BLOCK_SIZE/512 - 1;
4341 }
4342
4343 if (need_flush ||
4344 time_after(jiffies, conf->reshape_checkpoint + 10*HZ)) {
4345 /* Need to update reshape_position in metadata */
4346 wait_barrier(conf);
4347 mddev->reshape_position = conf->reshape_progress;
4348 if (mddev->reshape_backwards)
4349 mddev->curr_resync_completed = raid10_size(mddev, 0, 0)
4350 - conf->reshape_progress;
4351 else
4352 mddev->curr_resync_completed = conf->reshape_progress;
4353 conf->reshape_checkpoint = jiffies;
4354 set_bit(MD_CHANGE_DEVS, &mddev->flags);
4355 md_wakeup_thread(mddev->thread);
4356 wait_event(mddev->sb_wait, mddev->flags == 0 ||
NeilBrownc91abf52013-11-19 12:02:01 +11004357 test_bit(MD_RECOVERY_INTR, &mddev->recovery));
4358 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4359 allow_barrier(conf);
4360 return sectors_done;
4361 }
NeilBrown3ea7daa2012-05-22 13:53:47 +10004362 conf->reshape_safe = mddev->reshape_position;
4363 allow_barrier(conf);
4364 }
4365
4366read_more:
4367 /* Now schedule reads for blocks from sector_nr to last */
4368 r10_bio = mempool_alloc(conf->r10buf_pool, GFP_NOIO);
NeilBrowncb8b12b2014-08-18 14:38:45 +10004369 r10_bio->state = 0;
NeilBrown3ea7daa2012-05-22 13:53:47 +10004370 raise_barrier(conf, sectors_done != 0);
4371 atomic_set(&r10_bio->remaining, 0);
4372 r10_bio->mddev = mddev;
4373 r10_bio->sector = sector_nr;
4374 set_bit(R10BIO_IsReshape, &r10_bio->state);
4375 r10_bio->sectors = last - sector_nr + 1;
4376 rdev = read_balance(conf, r10_bio, &max_sectors);
4377 BUG_ON(!test_bit(R10BIO_Previous, &r10_bio->state));
4378
4379 if (!rdev) {
4380 /* Cannot read from here, so need to record bad blocks
4381 * on all the target devices.
4382 */
4383 // FIXME
NeilBrowne337aea2014-08-18 14:48:54 +10004384 mempool_free(r10_bio, conf->r10buf_pool);
NeilBrown3ea7daa2012-05-22 13:53:47 +10004385 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4386 return sectors_done;
4387 }
4388
4389 read_bio = bio_alloc_mddev(GFP_KERNEL, RESYNC_PAGES, mddev);
4390
4391 read_bio->bi_bdev = rdev->bdev;
Kent Overstreet4f024f32013-10-11 15:44:27 -07004392 read_bio->bi_iter.bi_sector = (r10_bio->devs[r10_bio->read_slot].addr
NeilBrown3ea7daa2012-05-22 13:53:47 +10004393 + rdev->data_offset);
4394 read_bio->bi_private = r10_bio;
4395 read_bio->bi_end_io = end_sync_read;
4396 read_bio->bi_rw = READ;
NeilBrownce0b0a42014-08-18 13:56:38 +10004397 read_bio->bi_flags &= (~0UL << BIO_RESET_BITS);
NeilBrown3fd83712014-08-23 20:19:26 +10004398 __set_bit(BIO_UPTODATE, &read_bio->bi_flags);
NeilBrown3ea7daa2012-05-22 13:53:47 +10004399 read_bio->bi_vcnt = 0;
Kent Overstreet4f024f32013-10-11 15:44:27 -07004400 read_bio->bi_iter.bi_size = 0;
NeilBrown3ea7daa2012-05-22 13:53:47 +10004401 r10_bio->master_bio = read_bio;
4402 r10_bio->read_slot = r10_bio->devs[r10_bio->read_slot].devnum;
4403
4404 /* Now find the locations in the new layout */
4405 __raid10_find_phys(&conf->geo, r10_bio);
4406
4407 blist = read_bio;
4408 read_bio->bi_next = NULL;
4409
4410 for (s = 0; s < conf->copies*2; s++) {
4411 struct bio *b;
4412 int d = r10_bio->devs[s/2].devnum;
4413 struct md_rdev *rdev2;
4414 if (s&1) {
4415 rdev2 = conf->mirrors[d].replacement;
4416 b = r10_bio->devs[s/2].repl_bio;
4417 } else {
4418 rdev2 = conf->mirrors[d].rdev;
4419 b = r10_bio->devs[s/2].bio;
4420 }
4421 if (!rdev2 || test_bit(Faulty, &rdev2->flags))
4422 continue;
Kent Overstreet8be185f2012-09-06 14:14:43 -07004423
4424 bio_reset(b);
NeilBrown3ea7daa2012-05-22 13:53:47 +10004425 b->bi_bdev = rdev2->bdev;
Kent Overstreet4f024f32013-10-11 15:44:27 -07004426 b->bi_iter.bi_sector = r10_bio->devs[s/2].addr +
4427 rdev2->new_data_offset;
NeilBrown3ea7daa2012-05-22 13:53:47 +10004428 b->bi_private = r10_bio;
4429 b->bi_end_io = end_reshape_write;
4430 b->bi_rw = WRITE;
NeilBrown3ea7daa2012-05-22 13:53:47 +10004431 b->bi_next = blist;
NeilBrown3ea7daa2012-05-22 13:53:47 +10004432 blist = b;
4433 }
4434
4435 /* Now add as many pages as possible to all of these bios. */
4436
4437 nr_sectors = 0;
4438 for (s = 0 ; s < max_sectors; s += PAGE_SIZE >> 9) {
4439 struct page *page = r10_bio->devs[0].bio->bi_io_vec[s/(PAGE_SIZE>>9)].bv_page;
4440 int len = (max_sectors - s) << 9;
4441 if (len > PAGE_SIZE)
4442 len = PAGE_SIZE;
4443 for (bio = blist; bio ; bio = bio->bi_next) {
4444 struct bio *bio2;
4445 if (bio_add_page(bio, page, len, 0))
4446 continue;
4447
4448 /* Didn't fit, must stop */
4449 for (bio2 = blist;
4450 bio2 && bio2 != bio;
4451 bio2 = bio2->bi_next) {
4452 /* Remove last page from this bio */
4453 bio2->bi_vcnt--;
Kent Overstreet4f024f32013-10-11 15:44:27 -07004454 bio2->bi_iter.bi_size -= len;
NeilBrown3fd83712014-08-23 20:19:26 +10004455 __clear_bit(BIO_SEG_VALID, &bio2->bi_flags);
NeilBrown3ea7daa2012-05-22 13:53:47 +10004456 }
4457 goto bio_full;
4458 }
4459 sector_nr += len >> 9;
4460 nr_sectors += len >> 9;
4461 }
4462bio_full:
4463 r10_bio->sectors = nr_sectors;
4464
4465 /* Now submit the read */
4466 md_sync_acct(read_bio->bi_bdev, r10_bio->sectors);
4467 atomic_inc(&r10_bio->remaining);
4468 read_bio->bi_next = NULL;
4469 generic_make_request(read_bio);
4470 sector_nr += nr_sectors;
4471 sectors_done += nr_sectors;
4472 if (sector_nr <= last)
4473 goto read_more;
4474
4475 /* Now that we have done the whole section we can
4476 * update reshape_progress
4477 */
4478 if (mddev->reshape_backwards)
4479 conf->reshape_progress -= sectors_done;
4480 else
4481 conf->reshape_progress += sectors_done;
4482
4483 return sectors_done;
4484}
4485
4486static void end_reshape_request(struct r10bio *r10_bio);
4487static int handle_reshape_read_error(struct mddev *mddev,
4488 struct r10bio *r10_bio);
4489static void reshape_request_write(struct mddev *mddev, struct r10bio *r10_bio)
4490{
4491 /* Reshape read completed. Hopefully we have a block
4492 * to write out.
4493 * If we got a read error then we do sync 1-page reads from
4494 * elsewhere until we find the data - or give up.
4495 */
4496 struct r10conf *conf = mddev->private;
4497 int s;
4498
4499 if (!test_bit(R10BIO_Uptodate, &r10_bio->state))
4500 if (handle_reshape_read_error(mddev, r10_bio) < 0) {
4501 /* Reshape has been aborted */
4502 md_done_sync(mddev, r10_bio->sectors, 0);
4503 return;
4504 }
4505
4506 /* We definitely have the data in the pages, schedule the
4507 * writes.
4508 */
4509 atomic_set(&r10_bio->remaining, 1);
4510 for (s = 0; s < conf->copies*2; s++) {
4511 struct bio *b;
4512 int d = r10_bio->devs[s/2].devnum;
4513 struct md_rdev *rdev;
4514 if (s&1) {
4515 rdev = conf->mirrors[d].replacement;
4516 b = r10_bio->devs[s/2].repl_bio;
4517 } else {
4518 rdev = conf->mirrors[d].rdev;
4519 b = r10_bio->devs[s/2].bio;
4520 }
4521 if (!rdev || test_bit(Faulty, &rdev->flags))
4522 continue;
4523 atomic_inc(&rdev->nr_pending);
4524 md_sync_acct(b->bi_bdev, r10_bio->sectors);
4525 atomic_inc(&r10_bio->remaining);
4526 b->bi_next = NULL;
4527 generic_make_request(b);
4528 }
4529 end_reshape_request(r10_bio);
4530}
4531
4532static void end_reshape(struct r10conf *conf)
4533{
4534 if (test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery))
4535 return;
4536
4537 spin_lock_irq(&conf->device_lock);
4538 conf->prev = conf->geo;
4539 md_finish_reshape(conf->mddev);
4540 smp_wmb();
4541 conf->reshape_progress = MaxSector;
4542 spin_unlock_irq(&conf->device_lock);
4543
4544 /* read-ahead size must cover two whole stripes, which is
4545 * 2 * (datadisks) * chunksize where 'n' is the number of raid devices
4546 */
4547 if (conf->mddev->queue) {
4548 int stripe = conf->geo.raid_disks *
4549 ((conf->mddev->chunk_sectors << 9) / PAGE_SIZE);
4550 stripe /= conf->geo.near_copies;
4551 if (conf->mddev->queue->backing_dev_info.ra_pages < 2 * stripe)
4552 conf->mddev->queue->backing_dev_info.ra_pages = 2 * stripe;
4553 }
4554 conf->fullsync = 0;
4555}
4556
NeilBrown3ea7daa2012-05-22 13:53:47 +10004557static int handle_reshape_read_error(struct mddev *mddev,
4558 struct r10bio *r10_bio)
4559{
4560 /* Use sync reads to get the blocks from somewhere else */
4561 int sectors = r10_bio->sectors;
NeilBrown3ea7daa2012-05-22 13:53:47 +10004562 struct r10conf *conf = mddev->private;
NeilBrowne0ee7782012-08-18 09:51:42 +10004563 struct {
4564 struct r10bio r10_bio;
4565 struct r10dev devs[conf->copies];
4566 } on_stack;
4567 struct r10bio *r10b = &on_stack.r10_bio;
NeilBrown3ea7daa2012-05-22 13:53:47 +10004568 int slot = 0;
4569 int idx = 0;
4570 struct bio_vec *bvec = r10_bio->master_bio->bi_io_vec;
4571
NeilBrowne0ee7782012-08-18 09:51:42 +10004572 r10b->sector = r10_bio->sector;
4573 __raid10_find_phys(&conf->prev, r10b);
NeilBrown3ea7daa2012-05-22 13:53:47 +10004574
4575 while (sectors) {
4576 int s = sectors;
4577 int success = 0;
4578 int first_slot = slot;
4579
4580 if (s > (PAGE_SIZE >> 9))
4581 s = PAGE_SIZE >> 9;
4582
4583 while (!success) {
NeilBrowne0ee7782012-08-18 09:51:42 +10004584 int d = r10b->devs[slot].devnum;
NeilBrown3ea7daa2012-05-22 13:53:47 +10004585 struct md_rdev *rdev = conf->mirrors[d].rdev;
4586 sector_t addr;
4587 if (rdev == NULL ||
4588 test_bit(Faulty, &rdev->flags) ||
4589 !test_bit(In_sync, &rdev->flags))
4590 goto failed;
4591
NeilBrowne0ee7782012-08-18 09:51:42 +10004592 addr = r10b->devs[slot].addr + idx * PAGE_SIZE;
NeilBrown3ea7daa2012-05-22 13:53:47 +10004593 success = sync_page_io(rdev,
4594 addr,
4595 s << 9,
4596 bvec[idx].bv_page,
4597 READ, false);
4598 if (success)
4599 break;
4600 failed:
4601 slot++;
4602 if (slot >= conf->copies)
4603 slot = 0;
4604 if (slot == first_slot)
4605 break;
4606 }
4607 if (!success) {
4608 /* couldn't read this block, must give up */
4609 set_bit(MD_RECOVERY_INTR,
4610 &mddev->recovery);
4611 return -EIO;
4612 }
4613 sectors -= s;
4614 idx++;
4615 }
4616 return 0;
4617}
4618
4619static void end_reshape_write(struct bio *bio, int error)
4620{
4621 int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
4622 struct r10bio *r10_bio = bio->bi_private;
4623 struct mddev *mddev = r10_bio->mddev;
4624 struct r10conf *conf = mddev->private;
4625 int d;
4626 int slot;
4627 int repl;
4628 struct md_rdev *rdev = NULL;
4629
4630 d = find_bio_disk(conf, r10_bio, bio, &slot, &repl);
4631 if (repl)
4632 rdev = conf->mirrors[d].replacement;
4633 if (!rdev) {
4634 smp_mb();
4635 rdev = conf->mirrors[d].rdev;
4636 }
4637
4638 if (!uptodate) {
4639 /* FIXME should record badblock */
4640 md_error(mddev, rdev);
4641 }
4642
4643 rdev_dec_pending(rdev, mddev);
4644 end_reshape_request(r10_bio);
4645}
4646
4647static void end_reshape_request(struct r10bio *r10_bio)
4648{
4649 if (!atomic_dec_and_test(&r10_bio->remaining))
4650 return;
4651 md_done_sync(r10_bio->mddev, r10_bio->sectors, 1);
4652 bio_put(r10_bio->master_bio);
4653 put_buf(r10_bio);
4654}
4655
4656static void raid10_finish_reshape(struct mddev *mddev)
4657{
4658 struct r10conf *conf = mddev->private;
4659
4660 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
4661 return;
4662
4663 if (mddev->delta_disks > 0) {
4664 sector_t size = raid10_size(mddev, 0, 0);
4665 md_set_array_sectors(mddev, size);
4666 if (mddev->recovery_cp > mddev->resync_max_sectors) {
4667 mddev->recovery_cp = mddev->resync_max_sectors;
4668 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4669 }
4670 mddev->resync_max_sectors = size;
4671 set_capacity(mddev->gendisk, mddev->array_sectors);
4672 revalidate_disk(mddev->gendisk);
NeilBrown63aced62012-05-22 13:55:33 +10004673 } else {
4674 int d;
4675 for (d = conf->geo.raid_disks ;
4676 d < conf->geo.raid_disks - mddev->delta_disks;
4677 d++) {
4678 struct md_rdev *rdev = conf->mirrors[d].rdev;
4679 if (rdev)
4680 clear_bit(In_sync, &rdev->flags);
4681 rdev = conf->mirrors[d].replacement;
4682 if (rdev)
4683 clear_bit(In_sync, &rdev->flags);
4684 }
NeilBrown3ea7daa2012-05-22 13:53:47 +10004685 }
4686 mddev->layout = mddev->new_layout;
4687 mddev->chunk_sectors = 1 << conf->geo.chunk_shift;
4688 mddev->reshape_position = MaxSector;
4689 mddev->delta_disks = 0;
4690 mddev->reshape_backwards = 0;
4691}
4692
NeilBrown84fc4b52011-10-11 16:49:58 +11004693static struct md_personality raid10_personality =
Linus Torvalds1da177e2005-04-16 15:20:36 -07004694{
4695 .name = "raid10",
NeilBrown2604b702006-01-06 00:20:36 -08004696 .level = 10,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004697 .owner = THIS_MODULE,
4698 .make_request = make_request,
4699 .run = run,
NeilBrownafa0f552014-12-15 12:56:58 +11004700 .free = raid10_free,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004701 .status = status,
4702 .error_handler = error,
4703 .hot_add_disk = raid10_add_disk,
4704 .hot_remove_disk= raid10_remove_disk,
4705 .spare_active = raid10_spare_active,
4706 .sync_request = sync_request,
NeilBrown6cce3b232006-01-06 00:20:16 -08004707 .quiesce = raid10_quiesce,
Dan Williams80c3a6c2009-03-17 18:10:40 -07004708 .size = raid10_size,
NeilBrown006a09a2012-03-19 12:46:40 +11004709 .resize = raid10_resize,
Trela, Maciejdab8b292010-03-08 16:02:45 +11004710 .takeover = raid10_takeover,
NeilBrown3ea7daa2012-05-22 13:53:47 +10004711 .check_reshape = raid10_check_reshape,
4712 .start_reshape = raid10_start_reshape,
4713 .finish_reshape = raid10_finish_reshape,
NeilBrown5c675f82014-12-15 12:56:56 +11004714 .congested = raid10_congested,
NeilBrown64590f42014-12-15 12:56:57 +11004715 .mergeable_bvec = raid10_mergeable_bvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004716};
4717
4718static int __init raid_init(void)
4719{
NeilBrown2604b702006-01-06 00:20:36 -08004720 return register_md_personality(&raid10_personality);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004721}
4722
4723static void raid_exit(void)
4724{
NeilBrown2604b702006-01-06 00:20:36 -08004725 unregister_md_personality(&raid10_personality);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004726}
4727
4728module_init(raid_init);
4729module_exit(raid_exit);
4730MODULE_LICENSE("GPL");
NeilBrown0efb9e62009-12-14 12:49:58 +11004731MODULE_DESCRIPTION("RAID10 (striped mirror) personality for MD");
Linus Torvalds1da177e2005-04-16 15:20:36 -07004732MODULE_ALIAS("md-personality-9"); /* RAID10 */
NeilBrownd9d166c2006-01-06 00:20:51 -08004733MODULE_ALIAS("md-raid10");
NeilBrown2604b702006-01-06 00:20:36 -08004734MODULE_ALIAS("md-level-10");
NeilBrown34db0cd2011-10-11 16:50:01 +11004735
4736module_param(max_queued_requests, int, S_IRUGO|S_IWUSR);