1af1a8899SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
21da177e4SLinus Torvalds /*
31da177e4SLinus Torvalds * raid1.c : Multiple Devices driver for Linux
41da177e4SLinus Torvalds *
51da177e4SLinus Torvalds * Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat
61da177e4SLinus Torvalds *
71da177e4SLinus Torvalds * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman
81da177e4SLinus Torvalds *
91da177e4SLinus Torvalds * RAID-1 management functions.
101da177e4SLinus Torvalds *
111da177e4SLinus Torvalds * Better read-balancing code written by Mika Kuoppala <miku@iki.fi>, 2000
121da177e4SLinus Torvalds *
1396de0e25SJan Engelhardt * Fixes to reconstruction by Jakob Østergaard" <jakob@ostenfeld.dk>
141da177e4SLinus Torvalds * Various fixes by Neil Brown <neilb@cse.unsw.edu.au>
151da177e4SLinus Torvalds *
16191ea9b2SNeilBrown * Changes by Peter T. Breuer <ptb@it.uc3m.es> 31/1/2003 to support
17191ea9b2SNeilBrown * bitmapped intelligence in resync:
18191ea9b2SNeilBrown *
19191ea9b2SNeilBrown * - bitmap marked during normal i/o
20191ea9b2SNeilBrown * - bitmap used to skip nondirty blocks during sync
21191ea9b2SNeilBrown *
22191ea9b2SNeilBrown * Additions to bitmap code, (C) 2003-2004 Paul Clements, SteelEye Technology:
23191ea9b2SNeilBrown * - persistent bitmap code
241da177e4SLinus Torvalds */
251da177e4SLinus Torvalds
265a0e3ad6STejun Heo #include <linux/slab.h>
2725570727SStephen Rothwell #include <linux/delay.h>
28bff61975SNeilBrown #include <linux/blkdev.h>
29056075c7SPaul Gortmaker #include <linux/module.h>
30bff61975SNeilBrown #include <linux/seq_file.h>
318bda470eSChristian Dietrich #include <linux/ratelimit.h>
3269b00b5bSGuoqing Jiang #include <linux/interval_tree_generic.h>
333f07c014SIngo Molnar
34109e3765SNeilBrown #include <trace/events/block.h>
353f07c014SIngo Molnar
3643b2e5d8SNeilBrown #include "md.h"
37ef740c37SChristoph Hellwig #include "raid1.h"
38935fe098SMike Snitzer #include "md-bitmap.h"
39191ea9b2SNeilBrown
40394ed8e4SShaohua Li #define UNSUPPORTED_MDDEV_FLAGS \
41394ed8e4SShaohua Li ((1L << MD_HAS_JOURNAL) | \
42ea0213e0SArtur Paszkiewicz (1L << MD_JOURNAL_CLEAN) | \
43ddc08823SPawel Baldysiak (1L << MD_HAS_PPL) | \
44ddc08823SPawel Baldysiak (1L << MD_HAS_MULTIPLE_PPLS))
45394ed8e4SShaohua Li
46fd76863eScolyli@suse.de static void allow_barrier(struct r1conf *conf, sector_t sector_nr);
47fd76863eScolyli@suse.de static void lower_barrier(struct r1conf *conf, sector_t sector_nr);
481da177e4SLinus Torvalds
49578b54adSNeilBrown #define raid1_log(md, fmt, args...) \
50578b54adSNeilBrown do { if ((md)->queue) blk_add_trace_msg((md)->queue, "raid1 " fmt, ##args); } while (0)
51578b54adSNeilBrown
52fb0eb5dfSMing Lei #include "raid1-10.c"
53fb0eb5dfSMing Lei
5469b00b5bSGuoqing Jiang #define START(node) ((node)->start)
5569b00b5bSGuoqing Jiang #define LAST(node) ((node)->last)
5669b00b5bSGuoqing Jiang INTERVAL_TREE_DEFINE(struct serial_info, node, sector_t, _subtree_last,
5769b00b5bSGuoqing Jiang START, LAST, static inline, raid1_rb);
5869b00b5bSGuoqing Jiang
check_and_add_serial(struct md_rdev * rdev,struct r1bio * r1_bio,struct serial_info * si,int idx)59d0d2d8baSGuoqing Jiang static int check_and_add_serial(struct md_rdev *rdev, struct r1bio *r1_bio,
60d0d2d8baSGuoqing Jiang struct serial_info *si, int idx)
613e148a32SGuoqing Jiang {
623e148a32SGuoqing Jiang unsigned long flags;
633e148a32SGuoqing Jiang int ret = 0;
64d0d2d8baSGuoqing Jiang sector_t lo = r1_bio->sector;
65d0d2d8baSGuoqing Jiang sector_t hi = lo + r1_bio->sectors;
66025471f9SGuoqing Jiang struct serial_in_rdev *serial = &rdev->serial[idx];
673e148a32SGuoqing Jiang
6869b00b5bSGuoqing Jiang spin_lock_irqsave(&serial->serial_lock, flags);
693e148a32SGuoqing Jiang /* collision happened */
7069b00b5bSGuoqing Jiang if (raid1_rb_iter_first(&serial->serial_rb, lo, hi))
713e148a32SGuoqing Jiang ret = -EBUSY;
72d0d2d8baSGuoqing Jiang else {
7369b00b5bSGuoqing Jiang si->start = lo;
7469b00b5bSGuoqing Jiang si->last = hi;
7569b00b5bSGuoqing Jiang raid1_rb_insert(si, &serial->serial_rb);
76d0d2d8baSGuoqing Jiang }
7769b00b5bSGuoqing Jiang spin_unlock_irqrestore(&serial->serial_lock, flags);
783e148a32SGuoqing Jiang
793e148a32SGuoqing Jiang return ret;
803e148a32SGuoqing Jiang }
813e148a32SGuoqing Jiang
wait_for_serialization(struct md_rdev * rdev,struct r1bio * r1_bio)82d0d2d8baSGuoqing Jiang static void wait_for_serialization(struct md_rdev *rdev, struct r1bio *r1_bio)
83d0d2d8baSGuoqing Jiang {
84d0d2d8baSGuoqing Jiang struct mddev *mddev = rdev->mddev;
85d0d2d8baSGuoqing Jiang struct serial_info *si;
86d0d2d8baSGuoqing Jiang int idx = sector_to_idx(r1_bio->sector);
87d0d2d8baSGuoqing Jiang struct serial_in_rdev *serial = &rdev->serial[idx];
88d0d2d8baSGuoqing Jiang
89d0d2d8baSGuoqing Jiang if (WARN_ON(!mddev->serial_info_pool))
90d0d2d8baSGuoqing Jiang return;
91d0d2d8baSGuoqing Jiang si = mempool_alloc(mddev->serial_info_pool, GFP_NOIO);
92d0d2d8baSGuoqing Jiang wait_event(serial->serial_io_wait,
93d0d2d8baSGuoqing Jiang check_and_add_serial(rdev, r1_bio, si, idx) == 0);
94d0d2d8baSGuoqing Jiang }
95d0d2d8baSGuoqing Jiang
remove_serial(struct md_rdev * rdev,sector_t lo,sector_t hi)96404659cfSGuoqing Jiang static void remove_serial(struct md_rdev *rdev, sector_t lo, sector_t hi)
973e148a32SGuoqing Jiang {
9869b00b5bSGuoqing Jiang struct serial_info *si;
993e148a32SGuoqing Jiang unsigned long flags;
1003e148a32SGuoqing Jiang int found = 0;
1013e148a32SGuoqing Jiang struct mddev *mddev = rdev->mddev;
102025471f9SGuoqing Jiang int idx = sector_to_idx(lo);
103025471f9SGuoqing Jiang struct serial_in_rdev *serial = &rdev->serial[idx];
1043e148a32SGuoqing Jiang
10569b00b5bSGuoqing Jiang spin_lock_irqsave(&serial->serial_lock, flags);
10669b00b5bSGuoqing Jiang for (si = raid1_rb_iter_first(&serial->serial_rb, lo, hi);
10769b00b5bSGuoqing Jiang si; si = raid1_rb_iter_next(si, lo, hi)) {
10869b00b5bSGuoqing Jiang if (si->start == lo && si->last == hi) {
10969b00b5bSGuoqing Jiang raid1_rb_remove(si, &serial->serial_rb);
11069b00b5bSGuoqing Jiang mempool_free(si, mddev->serial_info_pool);
1113e148a32SGuoqing Jiang found = 1;
1123e148a32SGuoqing Jiang break;
1133e148a32SGuoqing Jiang }
11469b00b5bSGuoqing Jiang }
1153e148a32SGuoqing Jiang if (!found)
116404659cfSGuoqing Jiang WARN(1, "The write IO is not recorded for serialization\n");
11769b00b5bSGuoqing Jiang spin_unlock_irqrestore(&serial->serial_lock, flags);
11869b00b5bSGuoqing Jiang wake_up(&serial->serial_io_wait);
1193e148a32SGuoqing Jiang }
1203e148a32SGuoqing Jiang
12198d30c58SMing Lei /*
12298d30c58SMing Lei * for resync bio, r1bio pointer can be retrieved from the per-bio
12398d30c58SMing Lei * 'struct resync_pages'.
12498d30c58SMing Lei */
get_resync_r1bio(struct bio * bio)12598d30c58SMing Lei static inline struct r1bio *get_resync_r1bio(struct bio *bio)
12698d30c58SMing Lei {
12798d30c58SMing Lei return get_resync_pages(bio)->raid_bio;
12898d30c58SMing Lei }
12998d30c58SMing Lei
r1bio_pool_alloc(gfp_t gfp_flags,void * data)130dd0fc66fSAl Viro static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data)
1311da177e4SLinus Torvalds {
1321da177e4SLinus Torvalds struct pool_info *pi = data;
1339f2c9d12SNeilBrown int size = offsetof(struct r1bio, bios[pi->raid_disks]);
1341da177e4SLinus Torvalds
1351da177e4SLinus Torvalds /* allocate a r1bio with room for raid_disks entries in the bios array */
1367eaceaccSJens Axboe return kzalloc(size, gfp_flags);
1371da177e4SLinus Torvalds }
1381da177e4SLinus Torvalds
1398e005f7cSmajianpeng #define RESYNC_DEPTH 32
1401da177e4SLinus Torvalds #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9)
1418e005f7cSmajianpeng #define RESYNC_WINDOW (RESYNC_BLOCK_SIZE * RESYNC_DEPTH)
1428e005f7cSmajianpeng #define RESYNC_WINDOW_SECTORS (RESYNC_WINDOW >> 9)
143c40f341fSGoldwyn Rodrigues #define CLUSTER_RESYNC_WINDOW (16 * RESYNC_WINDOW)
144c40f341fSGoldwyn Rodrigues #define CLUSTER_RESYNC_WINDOW_SECTORS (CLUSTER_RESYNC_WINDOW >> 9)
1451da177e4SLinus Torvalds
r1buf_pool_alloc(gfp_t gfp_flags,void * data)146dd0fc66fSAl Viro static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data)
1471da177e4SLinus Torvalds {
1481da177e4SLinus Torvalds struct pool_info *pi = data;
1499f2c9d12SNeilBrown struct r1bio *r1_bio;
1501da177e4SLinus Torvalds struct bio *bio;
151da1aab3dSNeilBrown int need_pages;
15298d30c58SMing Lei int j;
15398d30c58SMing Lei struct resync_pages *rps;
1541da177e4SLinus Torvalds
1551da177e4SLinus Torvalds r1_bio = r1bio_pool_alloc(gfp_flags, pi);
1567eaceaccSJens Axboe if (!r1_bio)
1571da177e4SLinus Torvalds return NULL;
1581da177e4SLinus Torvalds
1596da2ec56SKees Cook rps = kmalloc_array(pi->raid_disks, sizeof(struct resync_pages),
16098d30c58SMing Lei gfp_flags);
16198d30c58SMing Lei if (!rps)
16298d30c58SMing Lei goto out_free_r1bio;
16398d30c58SMing Lei
1641da177e4SLinus Torvalds /*
1651da177e4SLinus Torvalds * Allocate bios : 1 for reading, n-1 for writing
1661da177e4SLinus Torvalds */
1671da177e4SLinus Torvalds for (j = pi->raid_disks ; j-- ; ) {
168066ff571SChristoph Hellwig bio = bio_kmalloc(RESYNC_PAGES, gfp_flags);
1691da177e4SLinus Torvalds if (!bio)
1701da177e4SLinus Torvalds goto out_free_bio;
171066ff571SChristoph Hellwig bio_init(bio, NULL, bio->bi_inline_vecs, RESYNC_PAGES, 0);
1721da177e4SLinus Torvalds r1_bio->bios[j] = bio;
1731da177e4SLinus Torvalds }
1741da177e4SLinus Torvalds /*
1751da177e4SLinus Torvalds * Allocate RESYNC_PAGES data pages and attach them to
176d11c171eSNeilBrown * the first bio.
177d11c171eSNeilBrown * If this is a user-requested check/repair, allocate
178d11c171eSNeilBrown * RESYNC_PAGES for each bio.
1791da177e4SLinus Torvalds */
180d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery))
181da1aab3dSNeilBrown need_pages = pi->raid_disks;
182d11c171eSNeilBrown else
183da1aab3dSNeilBrown need_pages = 1;
18498d30c58SMing Lei for (j = 0; j < pi->raid_disks; j++) {
18598d30c58SMing Lei struct resync_pages *rp = &rps[j];
1861da177e4SLinus Torvalds
18798d30c58SMing Lei bio = r1_bio->bios[j];
18898d30c58SMing Lei
18998d30c58SMing Lei if (j < need_pages) {
19098d30c58SMing Lei if (resync_alloc_pages(rp, gfp_flags))
191da1aab3dSNeilBrown goto out_free_pages;
19298d30c58SMing Lei } else {
19398d30c58SMing Lei memcpy(rp, &rps[0], sizeof(*rp));
19498d30c58SMing Lei resync_get_all_pages(rp);
195d11c171eSNeilBrown }
19698d30c58SMing Lei
19798d30c58SMing Lei rp->raid_bio = r1_bio;
19898d30c58SMing Lei bio->bi_private = rp;
199d11c171eSNeilBrown }
2001da177e4SLinus Torvalds
2011da177e4SLinus Torvalds r1_bio->master_bio = NULL;
2021da177e4SLinus Torvalds
2031da177e4SLinus Torvalds return r1_bio;
2041da177e4SLinus Torvalds
205da1aab3dSNeilBrown out_free_pages:
206491221f8SGuoqing Jiang while (--j >= 0)
20798d30c58SMing Lei resync_free_pages(&rps[j]);
208da1aab3dSNeilBrown
2091da177e4SLinus Torvalds out_free_bio:
210066ff571SChristoph Hellwig while (++j < pi->raid_disks) {
211066ff571SChristoph Hellwig bio_uninit(r1_bio->bios[j]);
212066ff571SChristoph Hellwig kfree(r1_bio->bios[j]);
213066ff571SChristoph Hellwig }
21498d30c58SMing Lei kfree(rps);
21598d30c58SMing Lei
21698d30c58SMing Lei out_free_r1bio:
217c7afa803SMarcos Paulo de Souza rbio_pool_free(r1_bio, data);
2181da177e4SLinus Torvalds return NULL;
2191da177e4SLinus Torvalds }
2201da177e4SLinus Torvalds
r1buf_pool_free(void * __r1_bio,void * data)2211da177e4SLinus Torvalds static void r1buf_pool_free(void *__r1_bio, void *data)
2221da177e4SLinus Torvalds {
2231da177e4SLinus Torvalds struct pool_info *pi = data;
22498d30c58SMing Lei int i;
2259f2c9d12SNeilBrown struct r1bio *r1bio = __r1_bio;
22698d30c58SMing Lei struct resync_pages *rp = NULL;
2271da177e4SLinus Torvalds
22898d30c58SMing Lei for (i = pi->raid_disks; i--; ) {
22998d30c58SMing Lei rp = get_resync_pages(r1bio->bios[i]);
23098d30c58SMing Lei resync_free_pages(rp);
231066ff571SChristoph Hellwig bio_uninit(r1bio->bios[i]);
232066ff571SChristoph Hellwig kfree(r1bio->bios[i]);
23398d30c58SMing Lei }
23498d30c58SMing Lei
23598d30c58SMing Lei /* resync pages array stored in the 1st bio's .bi_private */
23698d30c58SMing Lei kfree(rp);
2371da177e4SLinus Torvalds
238c7afa803SMarcos Paulo de Souza rbio_pool_free(r1bio, data);
2391da177e4SLinus Torvalds }
2401da177e4SLinus Torvalds
put_all_bios(struct r1conf * conf,struct r1bio * r1_bio)241e8096360SNeilBrown static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio)
2421da177e4SLinus Torvalds {
2431da177e4SLinus Torvalds int i;
2441da177e4SLinus Torvalds
2458f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) {
2461da177e4SLinus Torvalds struct bio **bio = r1_bio->bios + i;
2474367af55SNeilBrown if (!BIO_SPECIAL(*bio))
2481da177e4SLinus Torvalds bio_put(*bio);
2491da177e4SLinus Torvalds *bio = NULL;
2501da177e4SLinus Torvalds }
2511da177e4SLinus Torvalds }
2521da177e4SLinus Torvalds
free_r1bio(struct r1bio * r1_bio)2539f2c9d12SNeilBrown static void free_r1bio(struct r1bio *r1_bio)
2541da177e4SLinus Torvalds {
255e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private;
2561da177e4SLinus Torvalds
2571da177e4SLinus Torvalds put_all_bios(conf, r1_bio);
258afeee514SKent Overstreet mempool_free(r1_bio, &conf->r1bio_pool);
2591da177e4SLinus Torvalds }
2601da177e4SLinus Torvalds
put_buf(struct r1bio * r1_bio)2619f2c9d12SNeilBrown static void put_buf(struct r1bio *r1_bio)
2621da177e4SLinus Torvalds {
263e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private;
264af5f42a7SShaohua Li sector_t sect = r1_bio->sector;
2653e198f78SNeilBrown int i;
2663e198f78SNeilBrown
2678f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) {
2683e198f78SNeilBrown struct bio *bio = r1_bio->bios[i];
2693e198f78SNeilBrown if (bio->bi_end_io)
2703e198f78SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev);
2713e198f78SNeilBrown }
2721da177e4SLinus Torvalds
273afeee514SKent Overstreet mempool_free(r1_bio, &conf->r1buf_pool);
2741da177e4SLinus Torvalds
275af5f42a7SShaohua Li lower_barrier(conf, sect);
2761da177e4SLinus Torvalds }
2771da177e4SLinus Torvalds
reschedule_retry(struct r1bio * r1_bio)2789f2c9d12SNeilBrown static void reschedule_retry(struct r1bio *r1_bio)
2791da177e4SLinus Torvalds {
2801da177e4SLinus Torvalds unsigned long flags;
281fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev;
282e8096360SNeilBrown struct r1conf *conf = mddev->private;
283fd76863eScolyli@suse.de int idx;
2841da177e4SLinus Torvalds
285fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector);
2861da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags);
2871da177e4SLinus Torvalds list_add(&r1_bio->retry_list, &conf->retry_list);
288824e47daScolyli@suse.de atomic_inc(&conf->nr_queued[idx]);
2891da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags);
2901da177e4SLinus Torvalds
29117999be4SNeilBrown wake_up(&conf->wait_barrier);
2921da177e4SLinus Torvalds md_wakeup_thread(mddev->thread);
2931da177e4SLinus Torvalds }
2941da177e4SLinus Torvalds
2951da177e4SLinus Torvalds /*
2961da177e4SLinus Torvalds * raid_end_bio_io() is called when we have finished servicing a mirrored
2971da177e4SLinus Torvalds * operation and are ready to return a success/failure code to the buffer
2981da177e4SLinus Torvalds * cache layer.
2991da177e4SLinus Torvalds */
call_bio_endio(struct r1bio * r1_bio)3009f2c9d12SNeilBrown static void call_bio_endio(struct r1bio *r1_bio)
301d2eb35acSNeilBrown {
302d2eb35acSNeilBrown struct bio *bio = r1_bio->master_bio;
303d2eb35acSNeilBrown
304d2eb35acSNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state))
3054e4cbee9SChristoph Hellwig bio->bi_status = BLK_STS_IOERR;
3064246a0b6SChristoph Hellwig
3074246a0b6SChristoph Hellwig bio_endio(bio);
308d2eb35acSNeilBrown }
309d2eb35acSNeilBrown
raid_end_bio_io(struct r1bio * r1_bio)3109f2c9d12SNeilBrown static void raid_end_bio_io(struct r1bio *r1_bio)
3111da177e4SLinus Torvalds {
3121da177e4SLinus Torvalds struct bio *bio = r1_bio->master_bio;
313c91114c2SDavid Jeffery struct r1conf *conf = r1_bio->mddev->private;
314c5d736f5SXueshi Hu sector_t sector = r1_bio->sector;
3151da177e4SLinus Torvalds
3164b6d287fSNeilBrown /* if nobody has done the final endio yet, do it now */
3174b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) {
31836a4e1feSNeilBrown pr_debug("raid1: sync end %s on sectors %llu-%llu\n",
3194b6d287fSNeilBrown (bio_data_dir(bio) == WRITE) ? "write" : "read",
3204f024f37SKent Overstreet (unsigned long long) bio->bi_iter.bi_sector,
3214f024f37SKent Overstreet (unsigned long long) bio_end_sector(bio) - 1);
3224b6d287fSNeilBrown
323d2eb35acSNeilBrown call_bio_endio(r1_bio);
3244b6d287fSNeilBrown }
325c5d736f5SXueshi Hu
326c5d736f5SXueshi Hu free_r1bio(r1_bio);
327c91114c2SDavid Jeffery /*
328c91114c2SDavid Jeffery * Wake up any possible resync thread that waits for the device
329c91114c2SDavid Jeffery * to go idle. All I/Os, even write-behind writes, are done.
330c91114c2SDavid Jeffery */
331c5d736f5SXueshi Hu allow_barrier(conf, sector);
3321da177e4SLinus Torvalds }
3331da177e4SLinus Torvalds
3341da177e4SLinus Torvalds /*
3351da177e4SLinus Torvalds * Update disk head position estimator based on IRQ completion info.
3361da177e4SLinus Torvalds */
update_head_pos(int disk,struct r1bio * r1_bio)3379f2c9d12SNeilBrown static inline void update_head_pos(int disk, struct r1bio *r1_bio)
3381da177e4SLinus Torvalds {
339e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private;
3401da177e4SLinus Torvalds
3411da177e4SLinus Torvalds conf->mirrors[disk].head_position =
3421da177e4SLinus Torvalds r1_bio->sector + (r1_bio->sectors);
3431da177e4SLinus Torvalds }
3441da177e4SLinus Torvalds
345ba3ae3beSNamhyung Kim /*
346ba3ae3beSNamhyung Kim * Find the disk number which triggered given bio
347ba3ae3beSNamhyung Kim */
find_bio_disk(struct r1bio * r1_bio,struct bio * bio)3489f2c9d12SNeilBrown static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio)
349ba3ae3beSNamhyung Kim {
350ba3ae3beSNamhyung Kim int mirror;
35130194636SNeilBrown struct r1conf *conf = r1_bio->mddev->private;
35230194636SNeilBrown int raid_disks = conf->raid_disks;
353ba3ae3beSNamhyung Kim
3548f19ccb2SNeilBrown for (mirror = 0; mirror < raid_disks * 2; mirror++)
355ba3ae3beSNamhyung Kim if (r1_bio->bios[mirror] == bio)
356ba3ae3beSNamhyung Kim break;
357ba3ae3beSNamhyung Kim
3588f19ccb2SNeilBrown BUG_ON(mirror == raid_disks * 2);
359ba3ae3beSNamhyung Kim update_head_pos(mirror, r1_bio);
360ba3ae3beSNamhyung Kim
361ba3ae3beSNamhyung Kim return mirror;
362ba3ae3beSNamhyung Kim }
363ba3ae3beSNamhyung Kim
raid1_end_read_request(struct bio * bio)3644246a0b6SChristoph Hellwig static void raid1_end_read_request(struct bio *bio)
3651da177e4SLinus Torvalds {
3664e4cbee9SChristoph Hellwig int uptodate = !bio->bi_status;
3679f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private;
368e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private;
369e5872d58SNeilBrown struct md_rdev *rdev = conf->mirrors[r1_bio->read_disk].rdev;
3701da177e4SLinus Torvalds
3711da177e4SLinus Torvalds /*
3721da177e4SLinus Torvalds * this branch is our 'one mirror IO has finished' event handler:
3731da177e4SLinus Torvalds */
374e5872d58SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio);
375ddaf22abSNeilBrown
376220946c9SNeilBrown if (uptodate)
3771da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state);
3782e52d449SNeilBrown else if (test_bit(FailFast, &rdev->flags) &&
3792e52d449SNeilBrown test_bit(R1BIO_FailFast, &r1_bio->state))
3802e52d449SNeilBrown /* This was a fail-fast read so we definitely
3812e52d449SNeilBrown * want to retry */
3822e52d449SNeilBrown ;
383dd00a99eSNeilBrown else {
384dd00a99eSNeilBrown /* If all other devices have failed, we want to return
385dd00a99eSNeilBrown * the error upwards rather than fail the last device.
386dd00a99eSNeilBrown * Here we redefine "uptodate" to mean "Don't want to retry"
387dd00a99eSNeilBrown */
388dd00a99eSNeilBrown unsigned long flags;
389dd00a99eSNeilBrown spin_lock_irqsave(&conf->device_lock, flags);
390dd00a99eSNeilBrown if (r1_bio->mddev->degraded == conf->raid_disks ||
391dd00a99eSNeilBrown (r1_bio->mddev->degraded == conf->raid_disks-1 &&
392e5872d58SNeilBrown test_bit(In_sync, &rdev->flags)))
393dd00a99eSNeilBrown uptodate = 1;
394dd00a99eSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags);
395dd00a99eSNeilBrown }
3961da177e4SLinus Torvalds
3977ad4d4a6SNeilBrown if (uptodate) {
3981da177e4SLinus Torvalds raid_end_bio_io(r1_bio);
399e5872d58SNeilBrown rdev_dec_pending(rdev, conf->mddev);
4007ad4d4a6SNeilBrown } else {
4011da177e4SLinus Torvalds /*
4021da177e4SLinus Torvalds * oops, read error:
4031da177e4SLinus Torvalds */
404913cce5aSChristoph Hellwig pr_err_ratelimited("md/raid1:%s: %pg: rescheduling sector %llu\n",
4059dd1e2faSNeilBrown mdname(conf->mddev),
406913cce5aSChristoph Hellwig rdev->bdev,
4078bda470eSChristian Dietrich (unsigned long long)r1_bio->sector);
408d2eb35acSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state);
4091da177e4SLinus Torvalds reschedule_retry(r1_bio);
4107ad4d4a6SNeilBrown /* don't drop the reference on read_disk yet */
4111da177e4SLinus Torvalds }
4121da177e4SLinus Torvalds }
4131da177e4SLinus Torvalds
close_write(struct r1bio * r1_bio)4149f2c9d12SNeilBrown static void close_write(struct r1bio *r1_bio)
4154e78064fSNeilBrown {
4164e78064fSNeilBrown /* it really is the end of this request */
4174e78064fSNeilBrown if (test_bit(R1BIO_BehindIO, &r1_bio->state)) {
418841c1316SMing Lei bio_free_pages(r1_bio->behind_master_bio);
419841c1316SMing Lei bio_put(r1_bio->behind_master_bio);
420841c1316SMing Lei r1_bio->behind_master_bio = NULL;
4214e78064fSNeilBrown }
4224e78064fSNeilBrown /* clear the bitmap if all writes complete successfully */
423e64e4018SAndy Shevchenko md_bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector,
4244e78064fSNeilBrown r1_bio->sectors,
4254e78064fSNeilBrown !test_bit(R1BIO_Degraded, &r1_bio->state),
426af6d7b76SNeilBrown test_bit(R1BIO_BehindIO, &r1_bio->state));
4274e78064fSNeilBrown md_write_end(r1_bio->mddev);
428cd5ff9a1SNeilBrown }
429cd5ff9a1SNeilBrown
r1_bio_write_done(struct r1bio * r1_bio)4309f2c9d12SNeilBrown static void r1_bio_write_done(struct r1bio *r1_bio)
431cd5ff9a1SNeilBrown {
432cd5ff9a1SNeilBrown if (!atomic_dec_and_test(&r1_bio->remaining))
433cd5ff9a1SNeilBrown return;
434cd5ff9a1SNeilBrown
435cd5ff9a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state))
436cd5ff9a1SNeilBrown reschedule_retry(r1_bio);
437cd5ff9a1SNeilBrown else {
438cd5ff9a1SNeilBrown close_write(r1_bio);
4394367af55SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state))
4404367af55SNeilBrown reschedule_retry(r1_bio);
4414367af55SNeilBrown else
4424e78064fSNeilBrown raid_end_bio_io(r1_bio);
4434e78064fSNeilBrown }
4444e78064fSNeilBrown }
4454e78064fSNeilBrown
raid1_end_write_request(struct bio * bio)4464246a0b6SChristoph Hellwig static void raid1_end_write_request(struct bio *bio)
4471da177e4SLinus Torvalds {
4489f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private;
449e5872d58SNeilBrown int behind = test_bit(R1BIO_BehindIO, &r1_bio->state);
450e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private;
45104b857f7SNeilBrown struct bio *to_put = NULL;
452e5872d58SNeilBrown int mirror = find_bio_disk(r1_bio, bio);
453e5872d58SNeilBrown struct md_rdev *rdev = conf->mirrors[mirror].rdev;
454e3f948cdSShaohua Li bool discard_error;
45569df9cfcSGuoqing Jiang sector_t lo = r1_bio->sector;
45669df9cfcSGuoqing Jiang sector_t hi = r1_bio->sector + r1_bio->sectors;
457e3f948cdSShaohua Li
4584e4cbee9SChristoph Hellwig discard_error = bio->bi_status && bio_op(bio) == REQ_OP_DISCARD;
4591da177e4SLinus Torvalds
4601da177e4SLinus Torvalds /*
461e9c7469bSTejun Heo * 'one mirror IO has finished' event handler:
4621da177e4SLinus Torvalds */
4634e4cbee9SChristoph Hellwig if (bio->bi_status && !discard_error) {
464e5872d58SNeilBrown set_bit(WriteErrorSeen, &rdev->flags);
465e5872d58SNeilBrown if (!test_and_set_bit(WantReplacement, &rdev->flags))
46619d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, &
46719d67169SNeilBrown conf->mddev->recovery);
46819d67169SNeilBrown
469212e7eb7SNeilBrown if (test_bit(FailFast, &rdev->flags) &&
470212e7eb7SNeilBrown (bio->bi_opf & MD_FAILFAST) &&
471212e7eb7SNeilBrown /* We never try FailFast to WriteMostly devices */
472212e7eb7SNeilBrown !test_bit(WriteMostly, &rdev->flags)) {
473212e7eb7SNeilBrown md_error(r1_bio->mddev, rdev);
474eeba6809SYufen Yu }
475eeba6809SYufen Yu
476eeba6809SYufen Yu /*
477eeba6809SYufen Yu * When the device is faulty, it is not necessary to
478eeba6809SYufen Yu * handle write error.
479212e7eb7SNeilBrown */
480eeba6809SYufen Yu if (!test_bit(Faulty, &rdev->flags))
481212e7eb7SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state);
482212e7eb7SNeilBrown else {
4832417b986SPaul Clements /* Fail the request */
4842417b986SPaul Clements set_bit(R1BIO_Degraded, &r1_bio->state);
485212e7eb7SNeilBrown /* Finished with this branch */
486212e7eb7SNeilBrown r1_bio->bios[mirror] = NULL;
487212e7eb7SNeilBrown to_put = bio;
488212e7eb7SNeilBrown }
4894367af55SNeilBrown } else {
4901da177e4SLinus Torvalds /*
491e9c7469bSTejun Heo * Set R1BIO_Uptodate in our master bio, so that we
492e9c7469bSTejun Heo * will return a good error code for to the higher
493e9c7469bSTejun Heo * levels even if IO on some other mirrored buffer
494e9c7469bSTejun Heo * fails.
4951da177e4SLinus Torvalds *
496e9c7469bSTejun Heo * The 'master' represents the composite IO operation
497e9c7469bSTejun Heo * to user-side. So if something waits for IO, then it
498e9c7469bSTejun Heo * will wait for the 'master' bio.
4991da177e4SLinus Torvalds */
5004367af55SNeilBrown sector_t first_bad;
5014367af55SNeilBrown int bad_sectors;
5024367af55SNeilBrown
503cd5ff9a1SNeilBrown r1_bio->bios[mirror] = NULL;
504cd5ff9a1SNeilBrown to_put = bio;
5053056e3aeSAlex Lyakas /*
5063056e3aeSAlex Lyakas * Do not set R1BIO_Uptodate if the current device is
5073056e3aeSAlex Lyakas * rebuilding or Faulty. This is because we cannot use
5083056e3aeSAlex Lyakas * such device for properly reading the data back (we could
5093056e3aeSAlex Lyakas * potentially use it, if the current write would have felt
5103056e3aeSAlex Lyakas * before rdev->recovery_offset, but for simplicity we don't
5113056e3aeSAlex Lyakas * check this here.
5123056e3aeSAlex Lyakas */
513e5872d58SNeilBrown if (test_bit(In_sync, &rdev->flags) &&
514e5872d58SNeilBrown !test_bit(Faulty, &rdev->flags))
5151da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state);
5161da177e4SLinus Torvalds
5174367af55SNeilBrown /* Maybe we can clear some bad blocks. */
518e5872d58SNeilBrown if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors,
519e3f948cdSShaohua Li &first_bad, &bad_sectors) && !discard_error) {
5204367af55SNeilBrown r1_bio->bios[mirror] = IO_MADE_GOOD;
5214367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state);
5224367af55SNeilBrown }
5234367af55SNeilBrown }
5244367af55SNeilBrown
5254b6d287fSNeilBrown if (behind) {
52669df9cfcSGuoqing Jiang if (test_bit(CollisionCheck, &rdev->flags))
527404659cfSGuoqing Jiang remove_serial(rdev, lo, hi);
528e5872d58SNeilBrown if (test_bit(WriteMostly, &rdev->flags))
5294b6d287fSNeilBrown atomic_dec(&r1_bio->behind_remaining);
5304b6d287fSNeilBrown
531e9c7469bSTejun Heo /*
532e9c7469bSTejun Heo * In behind mode, we ACK the master bio once the I/O
533e9c7469bSTejun Heo * has safely reached all non-writemostly
534e9c7469bSTejun Heo * disks. Setting the Returned bit ensures that this
535e9c7469bSTejun Heo * gets done only once -- we don't ever want to return
536e9c7469bSTejun Heo * -EIO here, instead we'll wait
537e9c7469bSTejun Heo */
5384b6d287fSNeilBrown if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) &&
5394b6d287fSNeilBrown test_bit(R1BIO_Uptodate, &r1_bio->state)) {
5404b6d287fSNeilBrown /* Maybe we can return now */
5414b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) {
5424b6d287fSNeilBrown struct bio *mbio = r1_bio->master_bio;
54336a4e1feSNeilBrown pr_debug("raid1: behind end write sectors"
54436a4e1feSNeilBrown " %llu-%llu\n",
5454f024f37SKent Overstreet (unsigned long long) mbio->bi_iter.bi_sector,
5464f024f37SKent Overstreet (unsigned long long) bio_end_sector(mbio) - 1);
547d2eb35acSNeilBrown call_bio_endio(r1_bio);
5484b6d287fSNeilBrown }
5494b6d287fSNeilBrown }
55069df9cfcSGuoqing Jiang } else if (rdev->mddev->serialize_policy)
55169df9cfcSGuoqing Jiang remove_serial(rdev, lo, hi);
5524367af55SNeilBrown if (r1_bio->bios[mirror] == NULL)
553e5872d58SNeilBrown rdev_dec_pending(rdev, conf->mddev);
554e9c7469bSTejun Heo
5551da177e4SLinus Torvalds /*
5561da177e4SLinus Torvalds * Let's see if all mirrored write operations have finished
5571da177e4SLinus Torvalds * already.
5581da177e4SLinus Torvalds */
559af6d7b76SNeilBrown r1_bio_write_done(r1_bio);
560c70810b3SNeilBrown
56104b857f7SNeilBrown if (to_put)
56204b857f7SNeilBrown bio_put(to_put);
5631da177e4SLinus Torvalds }
5641da177e4SLinus Torvalds
align_to_barrier_unit_end(sector_t start_sector,sector_t sectors)565fd76863eScolyli@suse.de static sector_t align_to_barrier_unit_end(sector_t start_sector,
566fd76863eScolyli@suse.de sector_t sectors)
567fd76863eScolyli@suse.de {
568fd76863eScolyli@suse.de sector_t len;
569fd76863eScolyli@suse.de
570fd76863eScolyli@suse.de WARN_ON(sectors == 0);
571fd76863eScolyli@suse.de /*
572fd76863eScolyli@suse.de * len is the number of sectors from start_sector to end of the
573fd76863eScolyli@suse.de * barrier unit which start_sector belongs to.
574fd76863eScolyli@suse.de */
575fd76863eScolyli@suse.de len = round_up(start_sector + 1, BARRIER_UNIT_SECTOR_SIZE) -
576fd76863eScolyli@suse.de start_sector;
577fd76863eScolyli@suse.de
578fd76863eScolyli@suse.de if (len > sectors)
579fd76863eScolyli@suse.de len = sectors;
580fd76863eScolyli@suse.de
581fd76863eScolyli@suse.de return len;
582fd76863eScolyli@suse.de }
583fd76863eScolyli@suse.de
5841da177e4SLinus Torvalds /*
5851da177e4SLinus Torvalds * This routine returns the disk from which the requested read should
5861da177e4SLinus Torvalds * be done. There is a per-array 'next expected sequential IO' sector
5871da177e4SLinus Torvalds * number - if this matches on the next IO then we use the last disk.
5881da177e4SLinus Torvalds * There is also a per-disk 'last know head position' sector that is
5891da177e4SLinus Torvalds * maintained from IRQ contexts, both the normal and the resync IO
5901da177e4SLinus Torvalds * completion handlers update this position correctly. If there is no
5911da177e4SLinus Torvalds * perfect sequential match then we pick the disk whose head is closest.
5921da177e4SLinus Torvalds *
5931da177e4SLinus Torvalds * If there are 2 mirrors in the same 2 devices, performance degrades
5941da177e4SLinus Torvalds * because position is mirror, not device based.
5951da177e4SLinus Torvalds *
5961da177e4SLinus Torvalds * The rdev for the device selected will have nr_pending incremented.
5971da177e4SLinus Torvalds */
read_balance(struct r1conf * conf,struct r1bio * r1_bio,int * max_sectors)598e8096360SNeilBrown static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors)
5991da177e4SLinus Torvalds {
600af3a2cd6SNeilBrown const sector_t this_sector = r1_bio->sector;
601d2eb35acSNeilBrown int sectors;
602d2eb35acSNeilBrown int best_good_sectors;
6039dedf603SShaohua Li int best_disk, best_dist_disk, best_pending_disk;
6049dedf603SShaohua Li int has_nonrot_disk;
605be4d3280SShaohua Li int disk;
60676073054SNeilBrown sector_t best_dist;
6079dedf603SShaohua Li unsigned int min_pending;
6083cb03002SNeilBrown struct md_rdev *rdev;
609f3ac8bf7SNeilBrown int choose_first;
61012cee5a8SShaohua Li int choose_next_idle;
6111da177e4SLinus Torvalds
6121da177e4SLinus Torvalds rcu_read_lock();
6131da177e4SLinus Torvalds /*
6148ddf9efeSNeilBrown * Check if we can balance. We can balance on the whole
6151da177e4SLinus Torvalds * device if no resync is going on, or below the resync window.
6161da177e4SLinus Torvalds * We take the first readable disk when above the resync window.
6171da177e4SLinus Torvalds */
6181da177e4SLinus Torvalds retry:
619d2eb35acSNeilBrown sectors = r1_bio->sectors;
62076073054SNeilBrown best_disk = -1;
6219dedf603SShaohua Li best_dist_disk = -1;
62276073054SNeilBrown best_dist = MaxSector;
6239dedf603SShaohua Li best_pending_disk = -1;
6249dedf603SShaohua Li min_pending = UINT_MAX;
625d2eb35acSNeilBrown best_good_sectors = 0;
6269dedf603SShaohua Li has_nonrot_disk = 0;
62712cee5a8SShaohua Li choose_next_idle = 0;
6282e52d449SNeilBrown clear_bit(R1BIO_FailFast, &r1_bio->state);
629d2eb35acSNeilBrown
6307d49ffcfSGoldwyn Rodrigues if ((conf->mddev->recovery_cp < this_sector + sectors) ||
6317d49ffcfSGoldwyn Rodrigues (mddev_is_clustered(conf->mddev) &&
63290382ed9SGoldwyn Rodrigues md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector,
6337d49ffcfSGoldwyn Rodrigues this_sector + sectors)))
6347d49ffcfSGoldwyn Rodrigues choose_first = 1;
6357d49ffcfSGoldwyn Rodrigues else
6367d49ffcfSGoldwyn Rodrigues choose_first = 0;
6371da177e4SLinus Torvalds
638be4d3280SShaohua Li for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) {
63976073054SNeilBrown sector_t dist;
640d2eb35acSNeilBrown sector_t first_bad;
641d2eb35acSNeilBrown int bad_sectors;
6429dedf603SShaohua Li unsigned int pending;
64312cee5a8SShaohua Li bool nonrot;
644d2eb35acSNeilBrown
645f3ac8bf7SNeilBrown rdev = rcu_dereference(conf->mirrors[disk].rdev);
646f3ac8bf7SNeilBrown if (r1_bio->bios[disk] == IO_BLOCKED
647f3ac8bf7SNeilBrown || rdev == NULL
64876073054SNeilBrown || test_bit(Faulty, &rdev->flags))
649f3ac8bf7SNeilBrown continue;
65076073054SNeilBrown if (!test_bit(In_sync, &rdev->flags) &&
65176073054SNeilBrown rdev->recovery_offset < this_sector + sectors)
65276073054SNeilBrown continue;
65376073054SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) {
65476073054SNeilBrown /* Don't balance among write-mostly, just
65576073054SNeilBrown * use the first as a last resort */
656d1901ef0STomáš Hodek if (best_dist_disk < 0) {
657307729c8SNeilBrown if (is_badblock(rdev, this_sector, sectors,
658307729c8SNeilBrown &first_bad, &bad_sectors)) {
659816b0acfSWei Fang if (first_bad <= this_sector)
660307729c8SNeilBrown /* Cannot use this */
661307729c8SNeilBrown continue;
662307729c8SNeilBrown best_good_sectors = first_bad - this_sector;
663307729c8SNeilBrown } else
664307729c8SNeilBrown best_good_sectors = sectors;
665d1901ef0STomáš Hodek best_dist_disk = disk;
666d1901ef0STomáš Hodek best_pending_disk = disk;
667307729c8SNeilBrown }
66876073054SNeilBrown continue;
6698ddf9efeSNeilBrown }
67076073054SNeilBrown /* This is a reasonable device to use. It might
67176073054SNeilBrown * even be best.
6721da177e4SLinus Torvalds */
673d2eb35acSNeilBrown if (is_badblock(rdev, this_sector, sectors,
674d2eb35acSNeilBrown &first_bad, &bad_sectors)) {
675d2eb35acSNeilBrown if (best_dist < MaxSector)
676d2eb35acSNeilBrown /* already have a better device */
677d2eb35acSNeilBrown continue;
678d2eb35acSNeilBrown if (first_bad <= this_sector) {
679d2eb35acSNeilBrown /* cannot read here. If this is the 'primary'
680d2eb35acSNeilBrown * device, then we must not read beyond
681d2eb35acSNeilBrown * bad_sectors from another device..
682d2eb35acSNeilBrown */
683d2eb35acSNeilBrown bad_sectors -= (this_sector - first_bad);
684d2eb35acSNeilBrown if (choose_first && sectors > bad_sectors)
685d2eb35acSNeilBrown sectors = bad_sectors;
686d2eb35acSNeilBrown if (best_good_sectors > sectors)
687d2eb35acSNeilBrown best_good_sectors = sectors;
688d2eb35acSNeilBrown
689d2eb35acSNeilBrown } else {
690d2eb35acSNeilBrown sector_t good_sectors = first_bad - this_sector;
691d2eb35acSNeilBrown if (good_sectors > best_good_sectors) {
692d2eb35acSNeilBrown best_good_sectors = good_sectors;
693d2eb35acSNeilBrown best_disk = disk;
694d2eb35acSNeilBrown }
695d2eb35acSNeilBrown if (choose_first)
696d2eb35acSNeilBrown break;
697d2eb35acSNeilBrown }
698d2eb35acSNeilBrown continue;
699d82dd0e3STomasz Majchrzak } else {
700d82dd0e3STomasz Majchrzak if ((sectors > best_good_sectors) && (best_disk >= 0))
701d82dd0e3STomasz Majchrzak best_disk = -1;
702d2eb35acSNeilBrown best_good_sectors = sectors;
703d82dd0e3STomasz Majchrzak }
704d2eb35acSNeilBrown
7052e52d449SNeilBrown if (best_disk >= 0)
7062e52d449SNeilBrown /* At least two disks to choose from so failfast is OK */
7072e52d449SNeilBrown set_bit(R1BIO_FailFast, &r1_bio->state);
7082e52d449SNeilBrown
70910f0d2a5SChristoph Hellwig nonrot = bdev_nonrot(rdev->bdev);
71012cee5a8SShaohua Li has_nonrot_disk |= nonrot;
7119dedf603SShaohua Li pending = atomic_read(&rdev->nr_pending);
71276073054SNeilBrown dist = abs(this_sector - conf->mirrors[disk].head_position);
71312cee5a8SShaohua Li if (choose_first) {
71476073054SNeilBrown best_disk = disk;
7151da177e4SLinus Torvalds break;
7161da177e4SLinus Torvalds }
71712cee5a8SShaohua Li /* Don't change to another disk for sequential reads */
71812cee5a8SShaohua Li if (conf->mirrors[disk].next_seq_sect == this_sector
71912cee5a8SShaohua Li || dist == 0) {
72012cee5a8SShaohua Li int opt_iosize = bdev_io_opt(rdev->bdev) >> 9;
72112cee5a8SShaohua Li struct raid1_info *mirror = &conf->mirrors[disk];
72212cee5a8SShaohua Li
72312cee5a8SShaohua Li best_disk = disk;
72412cee5a8SShaohua Li /*
72512cee5a8SShaohua Li * If buffered sequential IO size exceeds optimal
72612cee5a8SShaohua Li * iosize, check if there is idle disk. If yes, choose
72712cee5a8SShaohua Li * the idle disk. read_balance could already choose an
72812cee5a8SShaohua Li * idle disk before noticing it's a sequential IO in
72912cee5a8SShaohua Li * this disk. This doesn't matter because this disk
73012cee5a8SShaohua Li * will idle, next time it will be utilized after the
73112cee5a8SShaohua Li * first disk has IO size exceeds optimal iosize. In
73212cee5a8SShaohua Li * this way, iosize of the first disk will be optimal
73312cee5a8SShaohua Li * iosize at least. iosize of the second disk might be
73412cee5a8SShaohua Li * small, but not a big deal since when the second disk
73512cee5a8SShaohua Li * starts IO, the first disk is likely still busy.
73612cee5a8SShaohua Li */
73712cee5a8SShaohua Li if (nonrot && opt_iosize > 0 &&
73812cee5a8SShaohua Li mirror->seq_start != MaxSector &&
73912cee5a8SShaohua Li mirror->next_seq_sect > opt_iosize &&
74012cee5a8SShaohua Li mirror->next_seq_sect - opt_iosize >=
74112cee5a8SShaohua Li mirror->seq_start) {
74212cee5a8SShaohua Li choose_next_idle = 1;
74312cee5a8SShaohua Li continue;
74412cee5a8SShaohua Li }
74512cee5a8SShaohua Li break;
74612cee5a8SShaohua Li }
74712cee5a8SShaohua Li
74812cee5a8SShaohua Li if (choose_next_idle)
74912cee5a8SShaohua Li continue;
7509dedf603SShaohua Li
7519dedf603SShaohua Li if (min_pending > pending) {
7529dedf603SShaohua Li min_pending = pending;
7539dedf603SShaohua Li best_pending_disk = disk;
7549dedf603SShaohua Li }
7559dedf603SShaohua Li
75676073054SNeilBrown if (dist < best_dist) {
75776073054SNeilBrown best_dist = dist;
7589dedf603SShaohua Li best_dist_disk = disk;
7591da177e4SLinus Torvalds }
760f3ac8bf7SNeilBrown }
7611da177e4SLinus Torvalds
7629dedf603SShaohua Li /*
7639dedf603SShaohua Li * If all disks are rotational, choose the closest disk. If any disk is
7649dedf603SShaohua Li * non-rotational, choose the disk with less pending request even the
7659dedf603SShaohua Li * disk is rotational, which might/might not be optimal for raids with
7669dedf603SShaohua Li * mixed ratation/non-rotational disks depending on workload.
7679dedf603SShaohua Li */
7689dedf603SShaohua Li if (best_disk == -1) {
7692e52d449SNeilBrown if (has_nonrot_disk || min_pending == 0)
7709dedf603SShaohua Li best_disk = best_pending_disk;
7719dedf603SShaohua Li else
7729dedf603SShaohua Li best_disk = best_dist_disk;
7739dedf603SShaohua Li }
7749dedf603SShaohua Li
77576073054SNeilBrown if (best_disk >= 0) {
77676073054SNeilBrown rdev = rcu_dereference(conf->mirrors[best_disk].rdev);
7778ddf9efeSNeilBrown if (!rdev)
7788ddf9efeSNeilBrown goto retry;
7798ddf9efeSNeilBrown atomic_inc(&rdev->nr_pending);
780d2eb35acSNeilBrown sectors = best_good_sectors;
78112cee5a8SShaohua Li
78212cee5a8SShaohua Li if (conf->mirrors[best_disk].next_seq_sect != this_sector)
78312cee5a8SShaohua Li conf->mirrors[best_disk].seq_start = this_sector;
78412cee5a8SShaohua Li
785be4d3280SShaohua Li conf->mirrors[best_disk].next_seq_sect = this_sector + sectors;
7861da177e4SLinus Torvalds }
7871da177e4SLinus Torvalds rcu_read_unlock();
788d2eb35acSNeilBrown *max_sectors = sectors;
7891da177e4SLinus Torvalds
79076073054SNeilBrown return best_disk;
7911da177e4SLinus Torvalds }
7921da177e4SLinus Torvalds
wake_up_barrier(struct r1conf * conf)79321bd9a68SJack Wang static void wake_up_barrier(struct r1conf *conf)
79421bd9a68SJack Wang {
79521bd9a68SJack Wang if (wq_has_sleeper(&conf->wait_barrier))
79621bd9a68SJack Wang wake_up(&conf->wait_barrier);
79721bd9a68SJack Wang }
79821bd9a68SJack Wang
flush_bio_list(struct r1conf * conf,struct bio * bio)799673ca68dSNeilBrown static void flush_bio_list(struct r1conf *conf, struct bio *bio)
800a35e63efSNeilBrown {
801673ca68dSNeilBrown /* flush any pending bitmap writes to disk before proceeding w/ I/O */
8029efcc2c3SYu Kuai raid1_prepare_flush_writes(conf->mddev->bitmap);
80321bd9a68SJack Wang wake_up_barrier(conf);
804a35e63efSNeilBrown
805a35e63efSNeilBrown while (bio) { /* submit pending writes */
806a35e63efSNeilBrown struct bio *next = bio->bi_next;
8078295efbeSYu Kuai
8088295efbeSYu Kuai raid1_submit_write(bio);
809a35e63efSNeilBrown bio = next;
8105fa4f8baSHannes Reinecke cond_resched();
811a35e63efSNeilBrown }
812673ca68dSNeilBrown }
813673ca68dSNeilBrown
flush_pending_writes(struct r1conf * conf)814673ca68dSNeilBrown static void flush_pending_writes(struct r1conf *conf)
815673ca68dSNeilBrown {
816673ca68dSNeilBrown /* Any writes that have been queued but are awaiting
817673ca68dSNeilBrown * bitmap updates get flushed here.
818673ca68dSNeilBrown */
819673ca68dSNeilBrown spin_lock_irq(&conf->device_lock);
820673ca68dSNeilBrown
821673ca68dSNeilBrown if (conf->pending_bio_list.head) {
82218022a1bSShaohua Li struct blk_plug plug;
823673ca68dSNeilBrown struct bio *bio;
82418022a1bSShaohua Li
825673ca68dSNeilBrown bio = bio_list_get(&conf->pending_bio_list);
826673ca68dSNeilBrown spin_unlock_irq(&conf->device_lock);
827474beb57SNeilBrown
828474beb57SNeilBrown /*
829474beb57SNeilBrown * As this is called in a wait_event() loop (see freeze_array),
830474beb57SNeilBrown * current->state might be TASK_UNINTERRUPTIBLE which will
831474beb57SNeilBrown * cause a warning when we prepare to wait again. As it is
832474beb57SNeilBrown * rare that this path is taken, it is perfectly safe to force
833474beb57SNeilBrown * us to go around the wait_event() loop again, so the warning
834474beb57SNeilBrown * is a false-positive. Silence the warning by resetting
835474beb57SNeilBrown * thread state
836474beb57SNeilBrown */
837474beb57SNeilBrown __set_current_state(TASK_RUNNING);
83818022a1bSShaohua Li blk_start_plug(&plug);
839673ca68dSNeilBrown flush_bio_list(conf, bio);
84018022a1bSShaohua Li blk_finish_plug(&plug);
841a35e63efSNeilBrown } else
842a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock);
8437eaceaccSJens Axboe }
8447eaceaccSJens Axboe
84517999be4SNeilBrown /* Barriers....
84617999be4SNeilBrown * Sometimes we need to suspend IO while we do something else,
84717999be4SNeilBrown * either some resync/recovery, or reconfigure the array.
84817999be4SNeilBrown * To do this we raise a 'barrier'.
84917999be4SNeilBrown * The 'barrier' is a counter that can be raised multiple times
85017999be4SNeilBrown * to count how many activities are happening which preclude
85117999be4SNeilBrown * normal IO.
85217999be4SNeilBrown * We can only raise the barrier if there is no pending IO.
85317999be4SNeilBrown * i.e. if nr_pending == 0.
85417999be4SNeilBrown * We choose only to raise the barrier if no-one is waiting for the
85517999be4SNeilBrown * barrier to go down. This means that as soon as an IO request
85617999be4SNeilBrown * is ready, no other operations which require a barrier will start
85717999be4SNeilBrown * until the IO request has had a chance.
85817999be4SNeilBrown *
85917999be4SNeilBrown * So: regular IO calls 'wait_barrier'. When that returns there
86017999be4SNeilBrown * is no backgroup IO happening, It must arrange to call
86117999be4SNeilBrown * allow_barrier when it has finished its IO.
86217999be4SNeilBrown * backgroup IO calls must call raise_barrier. Once that returns
86317999be4SNeilBrown * there is no normal IO happeing. It must arrange to call
86417999be4SNeilBrown * lower_barrier when the particular background IO completes.
8654675719dSHou Tao *
8664675719dSHou Tao * If resync/recovery is interrupted, returns -EINTR;
8674675719dSHou Tao * Otherwise, returns 0.
8681da177e4SLinus Torvalds */
raise_barrier(struct r1conf * conf,sector_t sector_nr)8694675719dSHou Tao static int raise_barrier(struct r1conf *conf, sector_t sector_nr)
8701da177e4SLinus Torvalds {
871fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr);
872fd76863eScolyli@suse.de
8731da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock);
8741da177e4SLinus Torvalds
87517999be4SNeilBrown /* Wait until no block IO is waiting */
876824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier,
877824e47daScolyli@suse.de !atomic_read(&conf->nr_waiting[idx]),
878eed8c02eSLukas Czerner conf->resync_lock);
87917999be4SNeilBrown
88017999be4SNeilBrown /* block any new IO from starting */
881824e47daScolyli@suse.de atomic_inc(&conf->barrier[idx]);
882824e47daScolyli@suse.de /*
883824e47daScolyli@suse.de * In raise_barrier() we firstly increase conf->barrier[idx] then
884824e47daScolyli@suse.de * check conf->nr_pending[idx]. In _wait_barrier() we firstly
885824e47daScolyli@suse.de * increase conf->nr_pending[idx] then check conf->barrier[idx].
886824e47daScolyli@suse.de * A memory barrier here to make sure conf->nr_pending[idx] won't
887824e47daScolyli@suse.de * be fetched before conf->barrier[idx] is increased. Otherwise
888824e47daScolyli@suse.de * there will be a race between raise_barrier() and _wait_barrier().
889824e47daScolyli@suse.de */
890824e47daScolyli@suse.de smp_mb__after_atomic();
89117999be4SNeilBrown
89279ef3a8aSmajianpeng /* For these conditions we must wait:
89379ef3a8aSmajianpeng * A: while the array is in frozen state
894fd76863eScolyli@suse.de * B: while conf->nr_pending[idx] is not 0, meaning regular I/O
895fd76863eScolyli@suse.de * existing in corresponding I/O barrier bucket.
896fd76863eScolyli@suse.de * C: while conf->barrier[idx] >= RESYNC_DEPTH, meaning reaches
897fd76863eScolyli@suse.de * max resync count which allowed on current I/O barrier bucket.
89879ef3a8aSmajianpeng */
89917999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier,
9008c242593SYufen Yu (!conf->array_frozen &&
901824e47daScolyli@suse.de !atomic_read(&conf->nr_pending[idx]) &&
9028c242593SYufen Yu atomic_read(&conf->barrier[idx]) < RESYNC_DEPTH) ||
9038c242593SYufen Yu test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery),
904eed8c02eSLukas Czerner conf->resync_lock);
90517999be4SNeilBrown
9068c242593SYufen Yu if (test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) {
9078c242593SYufen Yu atomic_dec(&conf->barrier[idx]);
9088c242593SYufen Yu spin_unlock_irq(&conf->resync_lock);
9098c242593SYufen Yu wake_up(&conf->wait_barrier);
9108c242593SYufen Yu return -EINTR;
9118c242593SYufen Yu }
9128c242593SYufen Yu
91343ac9b84SXiao Ni atomic_inc(&conf->nr_sync_pending);
9141da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock);
9158c242593SYufen Yu
9168c242593SYufen Yu return 0;
9171da177e4SLinus Torvalds }
9181da177e4SLinus Torvalds
lower_barrier(struct r1conf * conf,sector_t sector_nr)919fd76863eScolyli@suse.de static void lower_barrier(struct r1conf *conf, sector_t sector_nr)
92017999be4SNeilBrown {
921fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr);
922fd76863eScolyli@suse.de
923824e47daScolyli@suse.de BUG_ON(atomic_read(&conf->barrier[idx]) <= 0);
924fd76863eScolyli@suse.de
925824e47daScolyli@suse.de atomic_dec(&conf->barrier[idx]);
92643ac9b84SXiao Ni atomic_dec(&conf->nr_sync_pending);
92717999be4SNeilBrown wake_up(&conf->wait_barrier);
92817999be4SNeilBrown }
92917999be4SNeilBrown
_wait_barrier(struct r1conf * conf,int idx,bool nowait)9305aa70503SVishal Verma static bool _wait_barrier(struct r1conf *conf, int idx, bool nowait)
93117999be4SNeilBrown {
9325aa70503SVishal Verma bool ret = true;
9335aa70503SVishal Verma
934824e47daScolyli@suse.de /*
935824e47daScolyli@suse.de * We need to increase conf->nr_pending[idx] very early here,
936824e47daScolyli@suse.de * then raise_barrier() can be blocked when it waits for
937824e47daScolyli@suse.de * conf->nr_pending[idx] to be 0. Then we can avoid holding
938824e47daScolyli@suse.de * conf->resync_lock when there is no barrier raised in same
939824e47daScolyli@suse.de * barrier unit bucket. Also if the array is frozen, I/O
940824e47daScolyli@suse.de * should be blocked until array is unfrozen.
941824e47daScolyli@suse.de */
942824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]);
943824e47daScolyli@suse.de /*
944824e47daScolyli@suse.de * In _wait_barrier() we firstly increase conf->nr_pending[idx], then
945824e47daScolyli@suse.de * check conf->barrier[idx]. In raise_barrier() we firstly increase
946824e47daScolyli@suse.de * conf->barrier[idx], then check conf->nr_pending[idx]. A memory
947824e47daScolyli@suse.de * barrier is necessary here to make sure conf->barrier[idx] won't be
948824e47daScolyli@suse.de * fetched before conf->nr_pending[idx] is increased. Otherwise there
949824e47daScolyli@suse.de * will be a race between _wait_barrier() and raise_barrier().
950824e47daScolyli@suse.de */
951824e47daScolyli@suse.de smp_mb__after_atomic();
95279ef3a8aSmajianpeng
953824e47daScolyli@suse.de /*
954824e47daScolyli@suse.de * Don't worry about checking two atomic_t variables at same time
955824e47daScolyli@suse.de * here. If during we check conf->barrier[idx], the array is
956824e47daScolyli@suse.de * frozen (conf->array_frozen is 1), and chonf->barrier[idx] is
957824e47daScolyli@suse.de * 0, it is safe to return and make the I/O continue. Because the
958824e47daScolyli@suse.de * array is frozen, all I/O returned here will eventually complete
959824e47daScolyli@suse.de * or be queued, no race will happen. See code comment in
960824e47daScolyli@suse.de * frozen_array().
961824e47daScolyli@suse.de */
962824e47daScolyli@suse.de if (!READ_ONCE(conf->array_frozen) &&
963824e47daScolyli@suse.de !atomic_read(&conf->barrier[idx]))
9645aa70503SVishal Verma return ret;
965824e47daScolyli@suse.de
966824e47daScolyli@suse.de /*
967824e47daScolyli@suse.de * After holding conf->resync_lock, conf->nr_pending[idx]
968824e47daScolyli@suse.de * should be decreased before waiting for barrier to drop.
969824e47daScolyli@suse.de * Otherwise, we may encounter a race condition because
970824e47daScolyli@suse.de * raise_barrer() might be waiting for conf->nr_pending[idx]
971824e47daScolyli@suse.de * to be 0 at same time.
972824e47daScolyli@suse.de */
973824e47daScolyli@suse.de spin_lock_irq(&conf->resync_lock);
974824e47daScolyli@suse.de atomic_inc(&conf->nr_waiting[idx]);
975824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]);
976824e47daScolyli@suse.de /*
977824e47daScolyli@suse.de * In case freeze_array() is waiting for
978824e47daScolyli@suse.de * get_unqueued_pending() == extra
979824e47daScolyli@suse.de */
98021bd9a68SJack Wang wake_up_barrier(conf);
981824e47daScolyli@suse.de /* Wait for the barrier in same barrier unit bucket to drop. */
9825aa70503SVishal Verma
9835aa70503SVishal Verma /* Return false when nowait flag is set */
9845aa70503SVishal Verma if (nowait) {
9855aa70503SVishal Verma ret = false;
9865aa70503SVishal Verma } else {
987824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier,
988824e47daScolyli@suse.de !conf->array_frozen &&
989824e47daScolyli@suse.de !atomic_read(&conf->barrier[idx]),
990824e47daScolyli@suse.de conf->resync_lock);
991824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]);
99279ef3a8aSmajianpeng }
99379ef3a8aSmajianpeng
9945aa70503SVishal Verma atomic_dec(&conf->nr_waiting[idx]);
9955aa70503SVishal Verma spin_unlock_irq(&conf->resync_lock);
9965aa70503SVishal Verma return ret;
9975aa70503SVishal Verma }
9985aa70503SVishal Verma
wait_read_barrier(struct r1conf * conf,sector_t sector_nr,bool nowait)9995aa70503SVishal Verma static bool wait_read_barrier(struct r1conf *conf, sector_t sector_nr, bool nowait)
100079ef3a8aSmajianpeng {
1001fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr);
10025aa70503SVishal Verma bool ret = true;
100379ef3a8aSmajianpeng
1004824e47daScolyli@suse.de /*
1005824e47daScolyli@suse.de * Very similar to _wait_barrier(). The difference is, for read
1006824e47daScolyli@suse.de * I/O we don't need wait for sync I/O, but if the whole array
1007824e47daScolyli@suse.de * is frozen, the read I/O still has to wait until the array is
1008824e47daScolyli@suse.de * unfrozen. Since there is no ordering requirement with
1009824e47daScolyli@suse.de * conf->barrier[idx] here, memory barrier is unnecessary as well.
1010824e47daScolyli@suse.de */
1011824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]);
1012824e47daScolyli@suse.de
1013824e47daScolyli@suse.de if (!READ_ONCE(conf->array_frozen))
10145aa70503SVishal Verma return ret;
101517999be4SNeilBrown
101617999be4SNeilBrown spin_lock_irq(&conf->resync_lock);
1017824e47daScolyli@suse.de atomic_inc(&conf->nr_waiting[idx]);
1018824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]);
1019824e47daScolyli@suse.de /*
1020824e47daScolyli@suse.de * In case freeze_array() is waiting for
1021824e47daScolyli@suse.de * get_unqueued_pending() == extra
1022d6b42dcbSNeilBrown */
102321bd9a68SJack Wang wake_up_barrier(conf);
1024824e47daScolyli@suse.de /* Wait for array to be unfrozen */
10255aa70503SVishal Verma
10265aa70503SVishal Verma /* Return false when nowait flag is set */
10275aa70503SVishal Verma if (nowait) {
10285aa70503SVishal Verma /* Return false when nowait flag is set */
10295aa70503SVishal Verma ret = false;
10305aa70503SVishal Verma } else {
1031824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier,
1032fd76863eScolyli@suse.de !conf->array_frozen,
1033eed8c02eSLukas Czerner conf->resync_lock);
1034824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]);
103579ef3a8aSmajianpeng }
103679ef3a8aSmajianpeng
10375aa70503SVishal Verma atomic_dec(&conf->nr_waiting[idx]);
10385aa70503SVishal Verma spin_unlock_irq(&conf->resync_lock);
10395aa70503SVishal Verma return ret;
10405aa70503SVishal Verma }
10415aa70503SVishal Verma
wait_barrier(struct r1conf * conf,sector_t sector_nr,bool nowait)10425aa70503SVishal Verma static bool wait_barrier(struct r1conf *conf, sector_t sector_nr, bool nowait)
1043fd76863eScolyli@suse.de {
1044fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr);
1045fd76863eScolyli@suse.de
10465aa70503SVishal Verma return _wait_barrier(conf, idx, nowait);
1047fd76863eScolyli@suse.de }
1048fd76863eScolyli@suse.de
_allow_barrier(struct r1conf * conf,int idx)1049fd76863eScolyli@suse.de static void _allow_barrier(struct r1conf *conf, int idx)
105017999be4SNeilBrown {
1051824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]);
105221bd9a68SJack Wang wake_up_barrier(conf);
105317999be4SNeilBrown }
105417999be4SNeilBrown
allow_barrier(struct r1conf * conf,sector_t sector_nr)1055fd76863eScolyli@suse.de static void allow_barrier(struct r1conf *conf, sector_t sector_nr)
1056fd76863eScolyli@suse.de {
1057fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr);
1058fd76863eScolyli@suse.de
1059fd76863eScolyli@suse.de _allow_barrier(conf, idx);
1060fd76863eScolyli@suse.de }
1061fd76863eScolyli@suse.de
1062fd76863eScolyli@suse.de /* conf->resync_lock should be held */
get_unqueued_pending(struct r1conf * conf)1063fd76863eScolyli@suse.de static int get_unqueued_pending(struct r1conf *conf)
1064fd76863eScolyli@suse.de {
1065fd76863eScolyli@suse.de int idx, ret;
1066fd76863eScolyli@suse.de
106743ac9b84SXiao Ni ret = atomic_read(&conf->nr_sync_pending);
106843ac9b84SXiao Ni for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++)
1069824e47daScolyli@suse.de ret += atomic_read(&conf->nr_pending[idx]) -
1070824e47daScolyli@suse.de atomic_read(&conf->nr_queued[idx]);
1071fd76863eScolyli@suse.de
1072fd76863eScolyli@suse.de return ret;
107317999be4SNeilBrown }
107417999be4SNeilBrown
freeze_array(struct r1conf * conf,int extra)1075e2d59925SNeilBrown static void freeze_array(struct r1conf *conf, int extra)
1076ddaf22abSNeilBrown {
1077fd76863eScolyli@suse.de /* Stop sync I/O and normal I/O and wait for everything to
107811353b9dSZhilong Liu * go quiet.
1079fd76863eScolyli@suse.de * This is called in two situations:
1080fd76863eScolyli@suse.de * 1) management command handlers (reshape, remove disk, quiesce).
1081fd76863eScolyli@suse.de * 2) one normal I/O request failed.
1082fd76863eScolyli@suse.de
1083fd76863eScolyli@suse.de * After array_frozen is set to 1, new sync IO will be blocked at
1084fd76863eScolyli@suse.de * raise_barrier(), and new normal I/O will blocked at _wait_barrier()
1085fd76863eScolyli@suse.de * or wait_read_barrier(). The flying I/Os will either complete or be
1086fd76863eScolyli@suse.de * queued. When everything goes quite, there are only queued I/Os left.
1087fd76863eScolyli@suse.de
1088fd76863eScolyli@suse.de * Every flying I/O contributes to a conf->nr_pending[idx], idx is the
1089fd76863eScolyli@suse.de * barrier bucket index which this I/O request hits. When all sync and
1090fd76863eScolyli@suse.de * normal I/O are queued, sum of all conf->nr_pending[] will match sum
1091fd76863eScolyli@suse.de * of all conf->nr_queued[]. But normal I/O failure is an exception,
1092fd76863eScolyli@suse.de * in handle_read_error(), we may call freeze_array() before trying to
1093fd76863eScolyli@suse.de * fix the read error. In this case, the error read I/O is not queued,
1094fd76863eScolyli@suse.de * so get_unqueued_pending() == 1.
1095fd76863eScolyli@suse.de *
1096fd76863eScolyli@suse.de * Therefore before this function returns, we need to wait until
1097fd76863eScolyli@suse.de * get_unqueued_pendings(conf) gets equal to extra. For
1098fd76863eScolyli@suse.de * normal I/O context, extra is 1, in rested situations extra is 0.
1099ddaf22abSNeilBrown */
1100ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock);
1101b364e3d0Smajianpeng conf->array_frozen = 1;
1102578b54adSNeilBrown raid1_log(conf->mddev, "wait freeze");
1103fd76863eScolyli@suse.de wait_event_lock_irq_cmd(
1104fd76863eScolyli@suse.de conf->wait_barrier,
1105fd76863eScolyli@suse.de get_unqueued_pending(conf) == extra,
1106ddaf22abSNeilBrown conf->resync_lock,
1107c3b328acSNeilBrown flush_pending_writes(conf));
1108ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock);
1109ddaf22abSNeilBrown }
unfreeze_array(struct r1conf * conf)1110e8096360SNeilBrown static void unfreeze_array(struct r1conf *conf)
1111ddaf22abSNeilBrown {
1112ddaf22abSNeilBrown /* reverse the effect of the freeze */
1113ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock);
1114b364e3d0Smajianpeng conf->array_frozen = 0;
1115ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock);
1116824e47daScolyli@suse.de wake_up(&conf->wait_barrier);
1117ddaf22abSNeilBrown }
1118ddaf22abSNeilBrown
alloc_behind_master_bio(struct r1bio * r1_bio,struct bio * bio)111916d56e2fSShaohua Li static void alloc_behind_master_bio(struct r1bio *r1_bio,
1120cb83efcfSNeilBrown struct bio *bio)
11214b6d287fSNeilBrown {
1122cb83efcfSNeilBrown int size = bio->bi_iter.bi_size;
1123841c1316SMing Lei unsigned vcnt = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1124841c1316SMing Lei int i = 0;
1125841c1316SMing Lei struct bio *behind_bio = NULL;
11264b6d287fSNeilBrown
1127609be106SChristoph Hellwig behind_bio = bio_alloc_bioset(NULL, vcnt, 0, GFP_NOIO,
1128609be106SChristoph Hellwig &r1_bio->mddev->bio_set);
1129841c1316SMing Lei if (!behind_bio)
113016d56e2fSShaohua Li return;
1131841c1316SMing Lei
113241743c1fSShaohua Li /* discard op, we don't support writezero/writesame yet */
113316d56e2fSShaohua Li if (!bio_has_data(bio)) {
113416d56e2fSShaohua Li behind_bio->bi_iter.bi_size = size;
113541743c1fSShaohua Li goto skip_copy;
113616d56e2fSShaohua Li }
113741743c1fSShaohua Li
1138841c1316SMing Lei while (i < vcnt && size) {
1139841c1316SMing Lei struct page *page;
1140841c1316SMing Lei int len = min_t(int, PAGE_SIZE, size);
1141841c1316SMing Lei
1142841c1316SMing Lei page = alloc_page(GFP_NOIO);
1143841c1316SMing Lei if (unlikely(!page))
1144841c1316SMing Lei goto free_pages;
1145841c1316SMing Lei
1146b42473cdSJohannes Thumshirn if (!bio_add_page(behind_bio, page, len, 0)) {
1147b42473cdSJohannes Thumshirn put_page(page);
1148b42473cdSJohannes Thumshirn goto free_pages;
1149b42473cdSJohannes Thumshirn }
1150841c1316SMing Lei
1151841c1316SMing Lei size -= len;
1152841c1316SMing Lei i++;
11534b6d287fSNeilBrown }
11544b6d287fSNeilBrown
1155cb83efcfSNeilBrown bio_copy_data(behind_bio, bio);
115641743c1fSShaohua Li skip_copy:
115756a64c17SLuis de Bethencourt r1_bio->behind_master_bio = behind_bio;
1158841c1316SMing Lei set_bit(R1BIO_BehindIO, &r1_bio->state);
1159841c1316SMing Lei
116016d56e2fSShaohua Li return;
1161841c1316SMing Lei
1162841c1316SMing Lei free_pages:
11634f024f37SKent Overstreet pr_debug("%dB behind alloc failed, doing sync I/O\n",
11644f024f37SKent Overstreet bio->bi_iter.bi_size);
1165841c1316SMing Lei bio_free_pages(behind_bio);
116616d56e2fSShaohua Li bio_put(behind_bio);
11674b6d287fSNeilBrown }
11684b6d287fSNeilBrown
raid1_unplug(struct blk_plug_cb * cb,bool from_schedule)1169f54a9d0eSNeilBrown static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule)
1170f54a9d0eSNeilBrown {
1171f54a9d0eSNeilBrown struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb,
1172f54a9d0eSNeilBrown cb);
1173f54a9d0eSNeilBrown struct mddev *mddev = plug->cb.data;
1174f54a9d0eSNeilBrown struct r1conf *conf = mddev->private;
1175f54a9d0eSNeilBrown struct bio *bio;
1176f54a9d0eSNeilBrown
11779efcc2c3SYu Kuai if (from_schedule) {
1178f54a9d0eSNeilBrown spin_lock_irq(&conf->device_lock);
1179f54a9d0eSNeilBrown bio_list_merge(&conf->pending_bio_list, &plug->pending);
1180f54a9d0eSNeilBrown spin_unlock_irq(&conf->device_lock);
118121bd9a68SJack Wang wake_up_barrier(conf);
1182f54a9d0eSNeilBrown md_wakeup_thread(mddev->thread);
1183f54a9d0eSNeilBrown kfree(plug);
1184f54a9d0eSNeilBrown return;
1185f54a9d0eSNeilBrown }
1186f54a9d0eSNeilBrown
1187f54a9d0eSNeilBrown /* we aren't scheduling, so we can do the write-out directly. */
1188f54a9d0eSNeilBrown bio = bio_list_get(&plug->pending);
1189673ca68dSNeilBrown flush_bio_list(conf, bio);
1190f54a9d0eSNeilBrown kfree(plug);
1191f54a9d0eSNeilBrown }
1192f54a9d0eSNeilBrown
init_r1bio(struct r1bio * r1_bio,struct mddev * mddev,struct bio * bio)1193689389a0SNeilBrown static void init_r1bio(struct r1bio *r1_bio, struct mddev *mddev, struct bio *bio)
1194689389a0SNeilBrown {
1195689389a0SNeilBrown r1_bio->master_bio = bio;
1196689389a0SNeilBrown r1_bio->sectors = bio_sectors(bio);
1197689389a0SNeilBrown r1_bio->state = 0;
1198689389a0SNeilBrown r1_bio->mddev = mddev;
1199689389a0SNeilBrown r1_bio->sector = bio->bi_iter.bi_sector;
1200689389a0SNeilBrown }
1201689389a0SNeilBrown
1202fd76863eScolyli@suse.de static inline struct r1bio *
alloc_r1bio(struct mddev * mddev,struct bio * bio)1203689389a0SNeilBrown alloc_r1bio(struct mddev *mddev, struct bio *bio)
1204fd76863eScolyli@suse.de {
1205fd76863eScolyli@suse.de struct r1conf *conf = mddev->private;
1206fd76863eScolyli@suse.de struct r1bio *r1_bio;
1207fd76863eScolyli@suse.de
1208afeee514SKent Overstreet r1_bio = mempool_alloc(&conf->r1bio_pool, GFP_NOIO);
1209689389a0SNeilBrown /* Ensure no bio records IO_BLOCKED */
1210689389a0SNeilBrown memset(r1_bio->bios, 0, conf->raid_disks * sizeof(r1_bio->bios[0]));
1211689389a0SNeilBrown init_r1bio(r1_bio, mddev, bio);
1212fd76863eScolyli@suse.de return r1_bio;
1213fd76863eScolyli@suse.de }
1214fd76863eScolyli@suse.de
raid1_read_request(struct mddev * mddev,struct bio * bio,int max_read_sectors,struct r1bio * r1_bio)1215c230e7e5SNeilBrown static void raid1_read_request(struct mddev *mddev, struct bio *bio,
1216689389a0SNeilBrown int max_read_sectors, struct r1bio *r1_bio)
12171da177e4SLinus Torvalds {
1218e8096360SNeilBrown struct r1conf *conf = mddev->private;
12190eaf822cSJonathan Brassow struct raid1_info *mirror;
12201da177e4SLinus Torvalds struct bio *read_bio;
12213b046a97SRobert LeBlanc struct bitmap *bitmap = mddev->bitmap;
12223c5e514dSBart Van Assche const enum req_op op = bio_op(bio);
12233c5e514dSBart Van Assche const blk_opf_t do_sync = bio->bi_opf & REQ_SYNC;
12241f68f0c4SNeilBrown int max_sectors;
1225d2eb35acSNeilBrown int rdisk;
12269b8ae7b9SGuoqing Jiang bool r1bio_existed = !!r1_bio;
1227689389a0SNeilBrown char b[BDEVNAME_SIZE];
1228689389a0SNeilBrown
1229689389a0SNeilBrown /*
1230689389a0SNeilBrown * If r1_bio is set, we are blocking the raid1d thread
1231689389a0SNeilBrown * so there is a tiny risk of deadlock. So ask for
1232689389a0SNeilBrown * emergency memory if needed.
1233689389a0SNeilBrown */
1234689389a0SNeilBrown gfp_t gfp = r1_bio ? (GFP_NOIO | __GFP_HIGH) : GFP_NOIO;
1235689389a0SNeilBrown
12369b8ae7b9SGuoqing Jiang if (r1bio_existed) {
1237689389a0SNeilBrown /* Need to get the block device name carefully */
1238689389a0SNeilBrown struct md_rdev *rdev;
1239689389a0SNeilBrown rcu_read_lock();
1240689389a0SNeilBrown rdev = rcu_dereference(conf->mirrors[r1_bio->read_disk].rdev);
1241689389a0SNeilBrown if (rdev)
1242900d156bSChristoph Hellwig snprintf(b, sizeof(b), "%pg", rdev->bdev);
1243689389a0SNeilBrown else
1244689389a0SNeilBrown strcpy(b, "???");
1245689389a0SNeilBrown rcu_read_unlock();
1246689389a0SNeilBrown }
1247d2eb35acSNeilBrown
1248fd76863eScolyli@suse.de /*
1249fd76863eScolyli@suse.de * Still need barrier for READ in case that whole
1250fd76863eScolyli@suse.de * array is frozen.
1251fd76863eScolyli@suse.de */
12525aa70503SVishal Verma if (!wait_read_barrier(conf, bio->bi_iter.bi_sector,
12535aa70503SVishal Verma bio->bi_opf & REQ_NOWAIT)) {
12545aa70503SVishal Verma bio_wouldblock_error(bio);
12555aa70503SVishal Verma return;
12565aa70503SVishal Verma }
12573b046a97SRobert LeBlanc
1258689389a0SNeilBrown if (!r1_bio)
1259689389a0SNeilBrown r1_bio = alloc_r1bio(mddev, bio);
1260689389a0SNeilBrown else
1261689389a0SNeilBrown init_r1bio(r1_bio, mddev, bio);
1262c230e7e5SNeilBrown r1_bio->sectors = max_read_sectors;
1263fd76863eScolyli@suse.de
1264fd76863eScolyli@suse.de /*
1265fd76863eScolyli@suse.de * make_request() can abort the operation when read-ahead is being
1266fd76863eScolyli@suse.de * used and no empty request is available.
1267fd76863eScolyli@suse.de */
1268d2eb35acSNeilBrown rdisk = read_balance(conf, r1_bio, &max_sectors);
12691da177e4SLinus Torvalds
12701da177e4SLinus Torvalds if (rdisk < 0) {
12711da177e4SLinus Torvalds /* couldn't find anywhere to read from */
12729b8ae7b9SGuoqing Jiang if (r1bio_existed) {
1273689389a0SNeilBrown pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n",
1274689389a0SNeilBrown mdname(mddev),
1275689389a0SNeilBrown b,
1276689389a0SNeilBrown (unsigned long long)r1_bio->sector);
1277689389a0SNeilBrown }
12781da177e4SLinus Torvalds raid_end_bio_io(r1_bio);
12795a7bbad2SChristoph Hellwig return;
12801da177e4SLinus Torvalds }
12811da177e4SLinus Torvalds mirror = conf->mirrors + rdisk;
12821da177e4SLinus Torvalds
12839b8ae7b9SGuoqing Jiang if (r1bio_existed)
1284913cce5aSChristoph Hellwig pr_info_ratelimited("md/raid1:%s: redirecting sector %llu to other mirror: %pg\n",
1285689389a0SNeilBrown mdname(mddev),
1286689389a0SNeilBrown (unsigned long long)r1_bio->sector,
1287913cce5aSChristoph Hellwig mirror->rdev->bdev);
1288689389a0SNeilBrown
1289e555190dSNeilBrown if (test_bit(WriteMostly, &mirror->rdev->flags) &&
1290e555190dSNeilBrown bitmap) {
12913b046a97SRobert LeBlanc /*
12923b046a97SRobert LeBlanc * Reading from a write-mostly device must take care not to
12933b046a97SRobert LeBlanc * over-take any writes that are 'behind'
1294e555190dSNeilBrown */
1295578b54adSNeilBrown raid1_log(mddev, "wait behind writes");
1296e555190dSNeilBrown wait_event(bitmap->behind_wait,
1297e555190dSNeilBrown atomic_read(&bitmap->behind_writes) == 0);
1298e555190dSNeilBrown }
1299c230e7e5SNeilBrown
1300c230e7e5SNeilBrown if (max_sectors < bio_sectors(bio)) {
1301c230e7e5SNeilBrown struct bio *split = bio_split(bio, max_sectors,
1302afeee514SKent Overstreet gfp, &conf->bio_split);
1303c230e7e5SNeilBrown bio_chain(split, bio);
1304ed00aabdSChristoph Hellwig submit_bio_noacct(bio);
1305c230e7e5SNeilBrown bio = split;
1306c230e7e5SNeilBrown r1_bio->master_bio = bio;
1307c230e7e5SNeilBrown r1_bio->sectors = max_sectors;
1308c230e7e5SNeilBrown }
1309c230e7e5SNeilBrown
13101da177e4SLinus Torvalds r1_bio->read_disk = rdisk;
1311bb2a9aceSYu Kuai if (!r1bio_existed) {
1312bb2a9aceSYu Kuai md_account_bio(mddev, &bio);
1313bb2a9aceSYu Kuai r1_bio->master_bio = bio;
1314bb2a9aceSYu Kuai }
1315abfc426dSChristoph Hellwig read_bio = bio_alloc_clone(mirror->rdev->bdev, bio, gfp,
1316abfc426dSChristoph Hellwig &mddev->bio_set);
13171da177e4SLinus Torvalds
13181da177e4SLinus Torvalds r1_bio->bios[rdisk] = read_bio;
13191da177e4SLinus Torvalds
13204f024f37SKent Overstreet read_bio->bi_iter.bi_sector = r1_bio->sector +
13214f024f37SKent Overstreet mirror->rdev->data_offset;
13221da177e4SLinus Torvalds read_bio->bi_end_io = raid1_end_read_request;
1323c34b7ac6SChristoph Hellwig read_bio->bi_opf = op | do_sync;
13242e52d449SNeilBrown if (test_bit(FailFast, &mirror->rdev->flags) &&
13252e52d449SNeilBrown test_bit(R1BIO_FailFast, &r1_bio->state))
13262e52d449SNeilBrown read_bio->bi_opf |= MD_FAILFAST;
13271da177e4SLinus Torvalds read_bio->bi_private = r1_bio;
13281da177e4SLinus Torvalds
1329109e3765SNeilBrown if (mddev->gendisk)
13301c02fca6SChristoph Hellwig trace_block_bio_remap(read_bio, disk_devt(mddev->gendisk),
13311c02fca6SChristoph Hellwig r1_bio->sector);
1332109e3765SNeilBrown
1333ed00aabdSChristoph Hellwig submit_bio_noacct(read_bio);
13341da177e4SLinus Torvalds }
13351da177e4SLinus Torvalds
raid1_write_request(struct mddev * mddev,struct bio * bio,int max_write_sectors)1336c230e7e5SNeilBrown static void raid1_write_request(struct mddev *mddev, struct bio *bio,
1337c230e7e5SNeilBrown int max_write_sectors)
13383b046a97SRobert LeBlanc {
13393b046a97SRobert LeBlanc struct r1conf *conf = mddev->private;
1340fd76863eScolyli@suse.de struct r1bio *r1_bio;
13413b046a97SRobert LeBlanc int i, disks;
13423b046a97SRobert LeBlanc struct bitmap *bitmap = mddev->bitmap;
13433b046a97SRobert LeBlanc unsigned long flags;
13443b046a97SRobert LeBlanc struct md_rdev *blocked_rdev;
13453b046a97SRobert LeBlanc int first_clone;
13463b046a97SRobert LeBlanc int max_sectors;
13476607cd31SGuoqing Jiang bool write_behind = false;
13483b046a97SRobert LeBlanc
1349b3143b9aSNeilBrown if (mddev_is_clustered(mddev) &&
13503b046a97SRobert LeBlanc md_cluster_ops->area_resyncing(mddev, WRITE,
1351b3143b9aSNeilBrown bio->bi_iter.bi_sector, bio_end_sector(bio))) {
13523b046a97SRobert LeBlanc
13533b046a97SRobert LeBlanc DEFINE_WAIT(w);
13545aa70503SVishal Verma if (bio->bi_opf & REQ_NOWAIT) {
13555aa70503SVishal Verma bio_wouldblock_error(bio);
13565aa70503SVishal Verma return;
13575aa70503SVishal Verma }
13583b046a97SRobert LeBlanc for (;;) {
13593b046a97SRobert LeBlanc prepare_to_wait(&conf->wait_barrier,
1360ae89fd3dSMikulas Patocka &w, TASK_IDLE);
1361f81f7302SGuoqing Jiang if (!md_cluster_ops->area_resyncing(mddev, WRITE,
13623b046a97SRobert LeBlanc bio->bi_iter.bi_sector,
1363b3143b9aSNeilBrown bio_end_sector(bio)))
13643b046a97SRobert LeBlanc break;
13653b046a97SRobert LeBlanc schedule();
13663b046a97SRobert LeBlanc }
13673b046a97SRobert LeBlanc finish_wait(&conf->wait_barrier, &w);
13683b046a97SRobert LeBlanc }
1369f81f7302SGuoqing Jiang
1370f81f7302SGuoqing Jiang /*
1371f81f7302SGuoqing Jiang * Register the new request and wait if the reconstruction
1372f81f7302SGuoqing Jiang * thread has put up a bar for new requests.
1373f81f7302SGuoqing Jiang * Continue immediately if no resync is active currently.
1374f81f7302SGuoqing Jiang */
13755aa70503SVishal Verma if (!wait_barrier(conf, bio->bi_iter.bi_sector,
13765aa70503SVishal Verma bio->bi_opf & REQ_NOWAIT)) {
13775aa70503SVishal Verma bio_wouldblock_error(bio);
13785aa70503SVishal Verma return;
13795aa70503SVishal Verma }
1380fd76863eScolyli@suse.de
1381992db13aSXueshi Hu retry_write:
1382689389a0SNeilBrown r1_bio = alloc_r1bio(mddev, bio);
1383c230e7e5SNeilBrown r1_bio->sectors = max_write_sectors;
13843b046a97SRobert LeBlanc
13851f68f0c4SNeilBrown /* first select target devices under rcu_lock and
13861da177e4SLinus Torvalds * inc refcount on their rdev. Record them by setting
13871da177e4SLinus Torvalds * bios[x] to bio
13881f68f0c4SNeilBrown * If there are known/acknowledged bad blocks on any device on
13891f68f0c4SNeilBrown * which we have seen a write error, we want to avoid writing those
13901f68f0c4SNeilBrown * blocks.
13911f68f0c4SNeilBrown * This potentially requires several writes to write around
13921f68f0c4SNeilBrown * the bad blocks. Each set of writes gets it's own r1bio
13931f68f0c4SNeilBrown * with a set of bios attached.
13941da177e4SLinus Torvalds */
1395c3b328acSNeilBrown
13968f19ccb2SNeilBrown disks = conf->raid_disks * 2;
13976bfe0b49SDan Williams blocked_rdev = NULL;
13981da177e4SLinus Torvalds rcu_read_lock();
13991f68f0c4SNeilBrown max_sectors = r1_bio->sectors;
14001da177e4SLinus Torvalds for (i = 0; i < disks; i++) {
14013cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev);
14026607cd31SGuoqing Jiang
14036607cd31SGuoqing Jiang /*
14046607cd31SGuoqing Jiang * The write-behind io is only attempted on drives marked as
14056607cd31SGuoqing Jiang * write-mostly, which means we could allocate write behind
14066607cd31SGuoqing Jiang * bio later.
14076607cd31SGuoqing Jiang */
14086607cd31SGuoqing Jiang if (rdev && test_bit(WriteMostly, &rdev->flags))
14096607cd31SGuoqing Jiang write_behind = true;
14106607cd31SGuoqing Jiang
14116bfe0b49SDan Williams if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) {
14126bfe0b49SDan Williams atomic_inc(&rdev->nr_pending);
14136bfe0b49SDan Williams blocked_rdev = rdev;
14146bfe0b49SDan Williams break;
14156bfe0b49SDan Williams }
14161da177e4SLinus Torvalds r1_bio->bios[i] = NULL;
14178ae12666SKent Overstreet if (!rdev || test_bit(Faulty, &rdev->flags)) {
14188f19ccb2SNeilBrown if (i < conf->raid_disks)
14191f68f0c4SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state);
14201f68f0c4SNeilBrown continue;
1421964147d5SNeilBrown }
14221f68f0c4SNeilBrown
14231f68f0c4SNeilBrown atomic_inc(&rdev->nr_pending);
14241f68f0c4SNeilBrown if (test_bit(WriteErrorSeen, &rdev->flags)) {
14251f68f0c4SNeilBrown sector_t first_bad;
14261f68f0c4SNeilBrown int bad_sectors;
14271f68f0c4SNeilBrown int is_bad;
14281f68f0c4SNeilBrown
14293b046a97SRobert LeBlanc is_bad = is_badblock(rdev, r1_bio->sector, max_sectors,
14301f68f0c4SNeilBrown &first_bad, &bad_sectors);
14311f68f0c4SNeilBrown if (is_bad < 0) {
14321f68f0c4SNeilBrown /* mustn't write here until the bad block is
14331f68f0c4SNeilBrown * acknowledged*/
14341f68f0c4SNeilBrown set_bit(BlockedBadBlocks, &rdev->flags);
14351f68f0c4SNeilBrown blocked_rdev = rdev;
14361f68f0c4SNeilBrown break;
14371f68f0c4SNeilBrown }
14381f68f0c4SNeilBrown if (is_bad && first_bad <= r1_bio->sector) {
14391f68f0c4SNeilBrown /* Cannot write here at all */
14401f68f0c4SNeilBrown bad_sectors -= (r1_bio->sector - first_bad);
14411f68f0c4SNeilBrown if (bad_sectors < max_sectors)
14421f68f0c4SNeilBrown /* mustn't write more than bad_sectors
14431f68f0c4SNeilBrown * to other devices yet
14441f68f0c4SNeilBrown */
14451f68f0c4SNeilBrown max_sectors = bad_sectors;
14461f68f0c4SNeilBrown rdev_dec_pending(rdev, mddev);
14471f68f0c4SNeilBrown /* We don't set R1BIO_Degraded as that
14481f68f0c4SNeilBrown * only applies if the disk is
14491f68f0c4SNeilBrown * missing, so it might be re-added,
14501f68f0c4SNeilBrown * and we want to know to recover this
14511f68f0c4SNeilBrown * chunk.
14521f68f0c4SNeilBrown * In this case the device is here,
14531f68f0c4SNeilBrown * and the fact that this chunk is not
14541f68f0c4SNeilBrown * in-sync is recorded in the bad
14551f68f0c4SNeilBrown * block log
14561f68f0c4SNeilBrown */
14571f68f0c4SNeilBrown continue;
14581f68f0c4SNeilBrown }
14591f68f0c4SNeilBrown if (is_bad) {
14601f68f0c4SNeilBrown int good_sectors = first_bad - r1_bio->sector;
14611f68f0c4SNeilBrown if (good_sectors < max_sectors)
14621f68f0c4SNeilBrown max_sectors = good_sectors;
14631f68f0c4SNeilBrown }
14641f68f0c4SNeilBrown }
14651f68f0c4SNeilBrown r1_bio->bios[i] = bio;
14661da177e4SLinus Torvalds }
14671da177e4SLinus Torvalds rcu_read_unlock();
14681da177e4SLinus Torvalds
14696bfe0b49SDan Williams if (unlikely(blocked_rdev)) {
14706bfe0b49SDan Williams /* Wait for this device to become unblocked */
14716bfe0b49SDan Williams int j;
14726bfe0b49SDan Williams
14736bfe0b49SDan Williams for (j = 0; j < i; j++)
14746bfe0b49SDan Williams if (r1_bio->bios[j])
14756bfe0b49SDan Williams rdev_dec_pending(conf->mirrors[j].rdev, mddev);
14763f28d49aSYu Kuai mempool_free(r1_bio, &conf->r1bio_pool);
1477fd76863eScolyli@suse.de allow_barrier(conf, bio->bi_iter.bi_sector);
14785aa70503SVishal Verma
14795aa70503SVishal Verma if (bio->bi_opf & REQ_NOWAIT) {
14805aa70503SVishal Verma bio_wouldblock_error(bio);
14815aa70503SVishal Verma return;
14825aa70503SVishal Verma }
1483578b54adSNeilBrown raid1_log(mddev, "wait rdev %d blocked", blocked_rdev->raid_disk);
14846bfe0b49SDan Williams md_wait_for_blocked_rdev(blocked_rdev, mddev);
14855aa70503SVishal Verma wait_barrier(conf, bio->bi_iter.bi_sector, false);
14866bfe0b49SDan Williams goto retry_write;
14876bfe0b49SDan Williams }
14886bfe0b49SDan Williams
14896607cd31SGuoqing Jiang /*
14906607cd31SGuoqing Jiang * When using a bitmap, we may call alloc_behind_master_bio below.
14916607cd31SGuoqing Jiang * alloc_behind_master_bio allocates a copy of the data payload a page
14926607cd31SGuoqing Jiang * at a time and thus needs a new bio that can fit the whole payload
14936607cd31SGuoqing Jiang * this bio in page sized chunks.
14946607cd31SGuoqing Jiang */
14956607cd31SGuoqing Jiang if (write_behind && bitmap)
14966607cd31SGuoqing Jiang max_sectors = min_t(int, max_sectors,
14976607cd31SGuoqing Jiang BIO_MAX_VECS * (PAGE_SIZE >> 9));
1498c230e7e5SNeilBrown if (max_sectors < bio_sectors(bio)) {
1499c230e7e5SNeilBrown struct bio *split = bio_split(bio, max_sectors,
1500afeee514SKent Overstreet GFP_NOIO, &conf->bio_split);
1501c230e7e5SNeilBrown bio_chain(split, bio);
1502ed00aabdSChristoph Hellwig submit_bio_noacct(bio);
1503c230e7e5SNeilBrown bio = split;
1504c230e7e5SNeilBrown r1_bio->master_bio = bio;
15051f68f0c4SNeilBrown r1_bio->sectors = max_sectors;
1506191ea9b2SNeilBrown }
15074b6d287fSNeilBrown
1508bb2a9aceSYu Kuai md_account_bio(mddev, &bio);
1509bb2a9aceSYu Kuai r1_bio->master_bio = bio;
15104e78064fSNeilBrown atomic_set(&r1_bio->remaining, 1);
15114b6d287fSNeilBrown atomic_set(&r1_bio->behind_remaining, 0);
1512191ea9b2SNeilBrown
15131f68f0c4SNeilBrown first_clone = 1;
1514d8c84c4fSMing Lei
15151da177e4SLinus Torvalds for (i = 0; i < disks; i++) {
15168e58e327SMing Lei struct bio *mbio = NULL;
151769df9cfcSGuoqing Jiang struct md_rdev *rdev = conf->mirrors[i].rdev;
15181da177e4SLinus Torvalds if (!r1_bio->bios[i])
15191da177e4SLinus Torvalds continue;
15201da177e4SLinus Torvalds
152146669e86SSong Liu if (first_clone) {
15221f68f0c4SNeilBrown /* do behind I/O ?
15231f68f0c4SNeilBrown * Not if there are too many, or cannot
15241f68f0c4SNeilBrown * allocate memory, or a reader on WriteMostly
15251f68f0c4SNeilBrown * is waiting for behind writes to flush */
15266b2460e6SHeinz Mauelshagen if (bitmap && write_behind &&
15271f68f0c4SNeilBrown (atomic_read(&bitmap->behind_writes)
15281f68f0c4SNeilBrown < mddev->bitmap_info.max_write_behind) &&
15298e58e327SMing Lei !waitqueue_active(&bitmap->behind_wait)) {
153016d56e2fSShaohua Li alloc_behind_master_bio(r1_bio, bio);
15318e58e327SMing Lei }
15321da177e4SLinus Torvalds
1533e64e4018SAndy Shevchenko md_bitmap_startwrite(bitmap, r1_bio->sector, r1_bio->sectors,
1534e64e4018SAndy Shevchenko test_bit(R1BIO_BehindIO, &r1_bio->state));
15351f68f0c4SNeilBrown first_clone = 0;
15361f68f0c4SNeilBrown }
15378e58e327SMing Lei
1538841c1316SMing Lei if (r1_bio->behind_master_bio) {
1539abfc426dSChristoph Hellwig mbio = bio_alloc_clone(rdev->bdev,
1540abfc426dSChristoph Hellwig r1_bio->behind_master_bio,
1541abfc426dSChristoph Hellwig GFP_NOIO, &mddev->bio_set);
154269df9cfcSGuoqing Jiang if (test_bit(CollisionCheck, &rdev->flags))
1543d0d2d8baSGuoqing Jiang wait_for_serialization(rdev, r1_bio);
15443e148a32SGuoqing Jiang if (test_bit(WriteMostly, &rdev->flags))
15454b6d287fSNeilBrown atomic_inc(&r1_bio->behind_remaining);
1546abfc426dSChristoph Hellwig } else {
1547abfc426dSChristoph Hellwig mbio = bio_alloc_clone(rdev->bdev, bio, GFP_NOIO,
1548abfc426dSChristoph Hellwig &mddev->bio_set);
1549abfc426dSChristoph Hellwig
1550abfc426dSChristoph Hellwig if (mddev->serialize_policy)
1551d0d2d8baSGuoqing Jiang wait_for_serialization(rdev, r1_bio);
1552abfc426dSChristoph Hellwig }
15534b6d287fSNeilBrown
15541f68f0c4SNeilBrown r1_bio->bios[i] = mbio;
15551f68f0c4SNeilBrown
15562e94275eSGuoqing Jiang mbio->bi_iter.bi_sector = (r1_bio->sector + rdev->data_offset);
15571f68f0c4SNeilBrown mbio->bi_end_io = raid1_end_write_request;
1558a682e003SLinus Torvalds mbio->bi_opf = bio_op(bio) | (bio->bi_opf & (REQ_SYNC | REQ_FUA));
15592e94275eSGuoqing Jiang if (test_bit(FailFast, &rdev->flags) &&
15602e94275eSGuoqing Jiang !test_bit(WriteMostly, &rdev->flags) &&
1561212e7eb7SNeilBrown conf->raid_disks - mddev->degraded > 1)
1562212e7eb7SNeilBrown mbio->bi_opf |= MD_FAILFAST;
15631f68f0c4SNeilBrown mbio->bi_private = r1_bio;
15641f68f0c4SNeilBrown
15651da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining);
1566f54a9d0eSNeilBrown
1567109e3765SNeilBrown if (mddev->gendisk)
15681c02fca6SChristoph Hellwig trace_block_bio_remap(mbio, disk_devt(mddev->gendisk),
1569109e3765SNeilBrown r1_bio->sector);
1570109e3765SNeilBrown /* flush_pending_writes() needs access to the rdev so...*/
15712e94275eSGuoqing Jiang mbio->bi_bdev = (void *)rdev;
1572460af1f9SYu Kuai if (!raid1_add_bio_to_plug(mddev, mbio, raid1_unplug, disks)) {
157323b245c0SShaohua Li spin_lock_irqsave(&conf->device_lock, flags);
15744e78064fSNeilBrown bio_list_add(&conf->pending_bio_list, mbio);
1575191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags);
1576b357f04aSNeilBrown md_wakeup_thread(mddev->thread);
15774e78064fSNeilBrown }
157823b245c0SShaohua Li }
15791f68f0c4SNeilBrown
1580079fa166SNeilBrown r1_bio_write_done(r1_bio);
1581079fa166SNeilBrown
1582079fa166SNeilBrown /* In case raid1d snuck in to freeze_array */
158321bd9a68SJack Wang wake_up_barrier(conf);
15841da177e4SLinus Torvalds }
15851da177e4SLinus Torvalds
raid1_make_request(struct mddev * mddev,struct bio * bio)1586cc27b0c7SNeilBrown static bool raid1_make_request(struct mddev *mddev, struct bio *bio)
15873b046a97SRobert LeBlanc {
1588fd76863eScolyli@suse.de sector_t sectors;
15893b046a97SRobert LeBlanc
1590775d7831SDavid Jeffery if (unlikely(bio->bi_opf & REQ_PREFLUSH)
1591775d7831SDavid Jeffery && md_flush_request(mddev, bio))
1592cc27b0c7SNeilBrown return true;
15933b046a97SRobert LeBlanc
1594c230e7e5SNeilBrown /*
1595c230e7e5SNeilBrown * There is a limit to the maximum size, but
1596c230e7e5SNeilBrown * the read/write handler might find a lower limit
1597c230e7e5SNeilBrown * due to bad blocks. To avoid multiple splits,
1598c230e7e5SNeilBrown * we pass the maximum number of sectors down
1599c230e7e5SNeilBrown * and let the lower level perform the split.
1600c230e7e5SNeilBrown */
1601fd76863eScolyli@suse.de sectors = align_to_barrier_unit_end(
1602fd76863eScolyli@suse.de bio->bi_iter.bi_sector, bio_sectors(bio));
16033b046a97SRobert LeBlanc
1604c230e7e5SNeilBrown if (bio_data_dir(bio) == READ)
1605689389a0SNeilBrown raid1_read_request(mddev, bio, sectors, NULL);
1606cc27b0c7SNeilBrown else {
1607cc27b0c7SNeilBrown if (!md_write_start(mddev,bio))
1608cc27b0c7SNeilBrown return false;
1609c230e7e5SNeilBrown raid1_write_request(mddev, bio, sectors);
16103b046a97SRobert LeBlanc }
1611cc27b0c7SNeilBrown return true;
1612cc27b0c7SNeilBrown }
16133b046a97SRobert LeBlanc
raid1_status(struct seq_file * seq,struct mddev * mddev)1614849674e4SShaohua Li static void raid1_status(struct seq_file *seq, struct mddev *mddev)
16151da177e4SLinus Torvalds {
1616e8096360SNeilBrown struct r1conf *conf = mddev->private;
16171da177e4SLinus Torvalds int i;
16181da177e4SLinus Torvalds
16191da177e4SLinus Torvalds seq_printf(seq, " [%d/%d] [", conf->raid_disks,
162011ce99e6SNeilBrown conf->raid_disks - mddev->degraded);
1621ddac7c7eSNeilBrown rcu_read_lock();
1622ddac7c7eSNeilBrown for (i = 0; i < conf->raid_disks; i++) {
16233cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev);
16241da177e4SLinus Torvalds seq_printf(seq, "%s",
1625ddac7c7eSNeilBrown rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_");
1626ddac7c7eSNeilBrown }
1627ddac7c7eSNeilBrown rcu_read_unlock();
16281da177e4SLinus Torvalds seq_printf(seq, "]");
16291da177e4SLinus Torvalds }
16301da177e4SLinus Torvalds
16319631abdbSMariusz Tkaczyk /**
16329631abdbSMariusz Tkaczyk * raid1_error() - RAID1 error handler.
16339631abdbSMariusz Tkaczyk * @mddev: affected md device.
16349631abdbSMariusz Tkaczyk * @rdev: member device to fail.
16359631abdbSMariusz Tkaczyk *
16369631abdbSMariusz Tkaczyk * The routine acknowledges &rdev failure and determines new @mddev state.
16379631abdbSMariusz Tkaczyk * If it failed, then:
16389631abdbSMariusz Tkaczyk * - &MD_BROKEN flag is set in &mddev->flags.
16399631abdbSMariusz Tkaczyk * - recovery is disabled.
16409631abdbSMariusz Tkaczyk * Otherwise, it must be degraded:
16419631abdbSMariusz Tkaczyk * - recovery is interrupted.
16429631abdbSMariusz Tkaczyk * - &mddev->degraded is bumped.
16439631abdbSMariusz Tkaczyk *
16449631abdbSMariusz Tkaczyk * @rdev is marked as &Faulty excluding case when array is failed and
16459631abdbSMariusz Tkaczyk * &mddev->fail_last_dev is off.
16469631abdbSMariusz Tkaczyk */
raid1_error(struct mddev * mddev,struct md_rdev * rdev)1647849674e4SShaohua Li static void raid1_error(struct mddev *mddev, struct md_rdev *rdev)
16481da177e4SLinus Torvalds {
1649e8096360SNeilBrown struct r1conf *conf = mddev->private;
1650423f04d6SNeilBrown unsigned long flags;
16511da177e4SLinus Torvalds
16522e52d449SNeilBrown spin_lock_irqsave(&conf->device_lock, flags);
16539631abdbSMariusz Tkaczyk
16549631abdbSMariusz Tkaczyk if (test_bit(In_sync, &rdev->flags) &&
16559631abdbSMariusz Tkaczyk (conf->raid_disks - mddev->degraded) == 1) {
16569631abdbSMariusz Tkaczyk set_bit(MD_BROKEN, &mddev->flags);
16579631abdbSMariusz Tkaczyk
16589631abdbSMariusz Tkaczyk if (!mddev->fail_last_dev) {
16595389042fSNeilBrown conf->recovery_disabled = mddev->recovery_disabled;
16602e52d449SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags);
16611da177e4SLinus Torvalds return;
16624044ba58SNeilBrown }
16639631abdbSMariusz Tkaczyk }
1664de393cdeSNeilBrown set_bit(Blocked, &rdev->flags);
1665ebda52faSYufen Yu if (test_and_clear_bit(In_sync, &rdev->flags))
16661da177e4SLinus Torvalds mddev->degraded++;
1667dd00a99eSNeilBrown set_bit(Faulty, &rdev->flags);
1668423f04d6SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags);
16691da177e4SLinus Torvalds /*
16701da177e4SLinus Torvalds * if recovery is running, make sure it aborts.
16711da177e4SLinus Torvalds */
1672dfc70645SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery);
16732953079cSShaohua Li set_mask_bits(&mddev->sb_flags, 0,
16742953079cSShaohua Li BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING));
1675913cce5aSChristoph Hellwig pr_crit("md/raid1:%s: Disk failure on %pg, disabling device.\n"
1676067032bcSJoe Perches "md/raid1:%s: Operation continuing on %d devices.\n",
1677913cce5aSChristoph Hellwig mdname(mddev), rdev->bdev,
16789dd1e2faSNeilBrown mdname(mddev), conf->raid_disks - mddev->degraded);
16791da177e4SLinus Torvalds }
16801da177e4SLinus Torvalds
print_conf(struct r1conf * conf)1681e8096360SNeilBrown static void print_conf(struct r1conf *conf)
16821da177e4SLinus Torvalds {
16831da177e4SLinus Torvalds int i;
16841da177e4SLinus Torvalds
16851d41c216SNeilBrown pr_debug("RAID1 conf printout:\n");
16861da177e4SLinus Torvalds if (!conf) {
16871d41c216SNeilBrown pr_debug("(!conf)\n");
16881da177e4SLinus Torvalds return;
16891da177e4SLinus Torvalds }
16901d41c216SNeilBrown pr_debug(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded,
16911da177e4SLinus Torvalds conf->raid_disks);
16921da177e4SLinus Torvalds
1693ddac7c7eSNeilBrown rcu_read_lock();
16941da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) {
16953cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev);
1696ddac7c7eSNeilBrown if (rdev)
1697913cce5aSChristoph Hellwig pr_debug(" disk %d, wo:%d, o:%d, dev:%pg\n",
1698ddac7c7eSNeilBrown i, !test_bit(In_sync, &rdev->flags),
1699ddac7c7eSNeilBrown !test_bit(Faulty, &rdev->flags),
1700913cce5aSChristoph Hellwig rdev->bdev);
17011da177e4SLinus Torvalds }
1702ddac7c7eSNeilBrown rcu_read_unlock();
17031da177e4SLinus Torvalds }
17041da177e4SLinus Torvalds
close_sync(struct r1conf * conf)1705e8096360SNeilBrown static void close_sync(struct r1conf *conf)
17061da177e4SLinus Torvalds {
1707f6eca2d4SNate Dailey int idx;
1708f6eca2d4SNate Dailey
1709f6eca2d4SNate Dailey for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) {
17105aa70503SVishal Verma _wait_barrier(conf, idx, false);
1711f6eca2d4SNate Dailey _allow_barrier(conf, idx);
1712f6eca2d4SNate Dailey }
17131da177e4SLinus Torvalds
1714afeee514SKent Overstreet mempool_exit(&conf->r1buf_pool);
17151da177e4SLinus Torvalds }
17161da177e4SLinus Torvalds
raid1_spare_active(struct mddev * mddev)1717fd01b88cSNeilBrown static int raid1_spare_active(struct mddev *mddev)
17181da177e4SLinus Torvalds {
17191da177e4SLinus Torvalds int i;
1720e8096360SNeilBrown struct r1conf *conf = mddev->private;
17216b965620SNeilBrown int count = 0;
17226b965620SNeilBrown unsigned long flags;
17231da177e4SLinus Torvalds
17241da177e4SLinus Torvalds /*
17251da177e4SLinus Torvalds * Find all failed disks within the RAID1 configuration
1726ddac7c7eSNeilBrown * and mark them readable.
1727ddac7c7eSNeilBrown * Called under mddev lock, so rcu protection not needed.
1728423f04d6SNeilBrown * device_lock used to avoid races with raid1_end_read_request
1729423f04d6SNeilBrown * which expects 'In_sync' flags and ->degraded to be consistent.
17301da177e4SLinus Torvalds */
1731423f04d6SNeilBrown spin_lock_irqsave(&conf->device_lock, flags);
17321da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) {
17333cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev;
17348c7a2c2bSNeilBrown struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev;
17358c7a2c2bSNeilBrown if (repl
17361aee41f6SGoldwyn Rodrigues && !test_bit(Candidate, &repl->flags)
17378c7a2c2bSNeilBrown && repl->recovery_offset == MaxSector
17388c7a2c2bSNeilBrown && !test_bit(Faulty, &repl->flags)
17398c7a2c2bSNeilBrown && !test_and_set_bit(In_sync, &repl->flags)) {
17408c7a2c2bSNeilBrown /* replacement has just become active */
17418c7a2c2bSNeilBrown if (!rdev ||
17428c7a2c2bSNeilBrown !test_and_clear_bit(In_sync, &rdev->flags))
17438c7a2c2bSNeilBrown count++;
17448c7a2c2bSNeilBrown if (rdev) {
17458c7a2c2bSNeilBrown /* Replaced device not technically
17468c7a2c2bSNeilBrown * faulty, but we need to be sure
17478c7a2c2bSNeilBrown * it gets removed and never re-added
17488c7a2c2bSNeilBrown */
17498c7a2c2bSNeilBrown set_bit(Faulty, &rdev->flags);
17508c7a2c2bSNeilBrown sysfs_notify_dirent_safe(
17518c7a2c2bSNeilBrown rdev->sysfs_state);
17528c7a2c2bSNeilBrown }
17538c7a2c2bSNeilBrown }
1754ddac7c7eSNeilBrown if (rdev
175561e4947cSLukasz Dorau && rdev->recovery_offset == MaxSector
1756ddac7c7eSNeilBrown && !test_bit(Faulty, &rdev->flags)
1757c04be0aaSNeilBrown && !test_and_set_bit(In_sync, &rdev->flags)) {
17586b965620SNeilBrown count++;
1759654e8b5aSJonathan Brassow sysfs_notify_dirent_safe(rdev->sysfs_state);
17601da177e4SLinus Torvalds }
17611da177e4SLinus Torvalds }
17626b965620SNeilBrown mddev->degraded -= count;
17636b965620SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags);
17641da177e4SLinus Torvalds
17651da177e4SLinus Torvalds print_conf(conf);
17666b965620SNeilBrown return count;
17671da177e4SLinus Torvalds }
17681da177e4SLinus Torvalds
raid1_add_disk(struct mddev * mddev,struct md_rdev * rdev)1769fd01b88cSNeilBrown static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev)
17701da177e4SLinus Torvalds {
1771e8096360SNeilBrown struct r1conf *conf = mddev->private;
1772199050eaSNeil Brown int err = -EEXIST;
1773ffb1e7a0SLi Nan int mirror = 0, repl_slot = -1;
17740eaf822cSJonathan Brassow struct raid1_info *p;
17756c2fce2eSNeil Brown int first = 0;
177630194636SNeilBrown int last = conf->raid_disks - 1;
17771da177e4SLinus Torvalds
17785389042fSNeilBrown if (mddev->recovery_disabled == conf->recovery_disabled)
17795389042fSNeilBrown return -EBUSY;
17805389042fSNeilBrown
17811501efadSDan Williams if (md_integrity_add_rdev(rdev, mddev))
17821501efadSDan Williams return -ENXIO;
17831501efadSDan Williams
17846c2fce2eSNeil Brown if (rdev->raid_disk >= 0)
17856c2fce2eSNeil Brown first = last = rdev->raid_disk;
17866c2fce2eSNeil Brown
178770bcecdbSGoldwyn Rodrigues /*
178870bcecdbSGoldwyn Rodrigues * find the disk ... but prefer rdev->saved_raid_disk
178970bcecdbSGoldwyn Rodrigues * if possible.
179070bcecdbSGoldwyn Rodrigues */
179170bcecdbSGoldwyn Rodrigues if (rdev->saved_raid_disk >= 0 &&
179270bcecdbSGoldwyn Rodrigues rdev->saved_raid_disk >= first &&
17939e753ba9SShaohua Li rdev->saved_raid_disk < conf->raid_disks &&
179470bcecdbSGoldwyn Rodrigues conf->mirrors[rdev->saved_raid_disk].rdev == NULL)
179570bcecdbSGoldwyn Rodrigues first = last = rdev->saved_raid_disk;
179670bcecdbSGoldwyn Rodrigues
17977ef449d1SNeilBrown for (mirror = first; mirror <= last; mirror++) {
17987ef449d1SNeilBrown p = conf->mirrors + mirror;
17997ef449d1SNeilBrown if (!p->rdev) {
18009092c02dSJonathan Brassow if (mddev->gendisk)
18018f6c2e4bSMartin K. Petersen disk_stack_limits(mddev->gendisk, rdev->bdev,
18028f6c2e4bSMartin K. Petersen rdev->data_offset << 9);
18031da177e4SLinus Torvalds
18041da177e4SLinus Torvalds p->head_position = 0;
18051da177e4SLinus Torvalds rdev->raid_disk = mirror;
1806199050eaSNeil Brown err = 0;
18076aea114aSNeilBrown /* As all devices are equivalent, we don't need a full recovery
18086aea114aSNeilBrown * if this was recently any drive of the array
18096aea114aSNeilBrown */
18106aea114aSNeilBrown if (rdev->saved_raid_disk < 0)
181141158c7eSNeilBrown conf->fullsync = 1;
1812d6065f7bSSuzanne Wood rcu_assign_pointer(p->rdev, rdev);
18131da177e4SLinus Torvalds break;
18141da177e4SLinus Torvalds }
18157ef449d1SNeilBrown if (test_bit(WantReplacement, &p->rdev->flags) &&
1816ffb1e7a0SLi Nan p[conf->raid_disks].rdev == NULL && repl_slot < 0)
1817ffb1e7a0SLi Nan repl_slot = mirror;
1818ffb1e7a0SLi Nan }
1819ffb1e7a0SLi Nan
1820ffb1e7a0SLi Nan if (err && repl_slot >= 0) {
18217ef449d1SNeilBrown /* Add this device as a replacement */
1822ffb1e7a0SLi Nan p = conf->mirrors + repl_slot;
18237ef449d1SNeilBrown clear_bit(In_sync, &rdev->flags);
18247ef449d1SNeilBrown set_bit(Replacement, &rdev->flags);
1825ffb1e7a0SLi Nan rdev->raid_disk = repl_slot;
18267ef449d1SNeilBrown err = 0;
18277ef449d1SNeilBrown conf->fullsync = 1;
18287ef449d1SNeilBrown rcu_assign_pointer(p[conf->raid_disks].rdev, rdev);
18297ef449d1SNeilBrown }
1830ffb1e7a0SLi Nan
18311da177e4SLinus Torvalds print_conf(conf);
1832199050eaSNeil Brown return err;
18331da177e4SLinus Torvalds }
18341da177e4SLinus Torvalds
raid1_remove_disk(struct mddev * mddev,struct md_rdev * rdev)1835b8321b68SNeilBrown static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev)
18361da177e4SLinus Torvalds {
1837e8096360SNeilBrown struct r1conf *conf = mddev->private;
18381da177e4SLinus Torvalds int err = 0;
1839b8321b68SNeilBrown int number = rdev->raid_disk;
1840df203da4SNigel Croxon struct raid1_info *p = conf->mirrors + number;
18418b0472b5SZhang Shurong
18428b0472b5SZhang Shurong if (unlikely(number >= conf->raid_disks))
18438b0472b5SZhang Shurong goto abort;
18448b0472b5SZhang Shurong
1845b014f14cSNeilBrown if (rdev != p->rdev)
1846b014f14cSNeilBrown p = conf->mirrors + conf->raid_disks + number;
1847b014f14cSNeilBrown
18481da177e4SLinus Torvalds print_conf(conf);
1849b8321b68SNeilBrown if (rdev == p->rdev) {
1850b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) ||
18511da177e4SLinus Torvalds atomic_read(&rdev->nr_pending)) {
18521da177e4SLinus Torvalds err = -EBUSY;
18531da177e4SLinus Torvalds goto abort;
18541da177e4SLinus Torvalds }
1855046abeedSNeilBrown /* Only remove non-faulty devices if recovery
1856dfc70645SNeilBrown * is not possible.
1857dfc70645SNeilBrown */
1858dfc70645SNeilBrown if (!test_bit(Faulty, &rdev->flags) &&
18595389042fSNeilBrown mddev->recovery_disabled != conf->recovery_disabled &&
1860dfc70645SNeilBrown mddev->degraded < conf->raid_disks) {
1861dfc70645SNeilBrown err = -EBUSY;
1862dfc70645SNeilBrown goto abort;
1863dfc70645SNeilBrown }
18641da177e4SLinus Torvalds p->rdev = NULL;
1865d787be40SNeilBrown if (!test_bit(RemoveSynchronized, &rdev->flags)) {
1866fbd568a3SPaul E. McKenney synchronize_rcu();
18671da177e4SLinus Torvalds if (atomic_read(&rdev->nr_pending)) {
18681da177e4SLinus Torvalds /* lost the race, try later */
18691da177e4SLinus Torvalds err = -EBUSY;
18701da177e4SLinus Torvalds p->rdev = rdev;
1871ac5e7113SAndre Noll goto abort;
1872d787be40SNeilBrown }
1873d787be40SNeilBrown }
1874d787be40SNeilBrown if (conf->mirrors[conf->raid_disks + number].rdev) {
18758c7a2c2bSNeilBrown /* We just removed a device that is being replaced.
18768c7a2c2bSNeilBrown * Move down the replacement. We drain all IO before
18778c7a2c2bSNeilBrown * doing this to avoid confusion.
18788c7a2c2bSNeilBrown */
18798c7a2c2bSNeilBrown struct md_rdev *repl =
18808c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev;
1881e2d59925SNeilBrown freeze_array(conf, 0);
18823de59bb9SYufen Yu if (atomic_read(&repl->nr_pending)) {
18833de59bb9SYufen Yu /* It means that some queued IO of retry_list
18843de59bb9SYufen Yu * hold repl. Thus, we cannot set replacement
18853de59bb9SYufen Yu * as NULL, avoiding rdev NULL pointer
18863de59bb9SYufen Yu * dereference in sync_request_write and
18873de59bb9SYufen Yu * handle_write_finished.
18883de59bb9SYufen Yu */
18893de59bb9SYufen Yu err = -EBUSY;
18903de59bb9SYufen Yu unfreeze_array(conf);
18913de59bb9SYufen Yu goto abort;
18923de59bb9SYufen Yu }
18938c7a2c2bSNeilBrown clear_bit(Replacement, &repl->flags);
18948c7a2c2bSNeilBrown p->rdev = repl;
18958c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev = NULL;
1896e2d59925SNeilBrown unfreeze_array(conf);
1897e5bc9c3cSGuoqing Jiang }
1898e5bc9c3cSGuoqing Jiang
18998c7a2c2bSNeilBrown clear_bit(WantReplacement, &rdev->flags);
1900a91a2785SMartin K. Petersen err = md_integrity_register(mddev);
19011da177e4SLinus Torvalds }
19021da177e4SLinus Torvalds abort:
19031da177e4SLinus Torvalds
19041da177e4SLinus Torvalds print_conf(conf);
19051da177e4SLinus Torvalds return err;
19061da177e4SLinus Torvalds }
19071da177e4SLinus Torvalds
end_sync_read(struct bio * bio)19084246a0b6SChristoph Hellwig static void end_sync_read(struct bio *bio)
19091da177e4SLinus Torvalds {
191098d30c58SMing Lei struct r1bio *r1_bio = get_resync_r1bio(bio);
19111da177e4SLinus Torvalds
19120fc280f6SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio);
1913ba3ae3beSNamhyung Kim
19141da177e4SLinus Torvalds /*
19151da177e4SLinus Torvalds * we have read a block, now it needs to be re-written,
19161da177e4SLinus Torvalds * or re-read if the read failed.
19171da177e4SLinus Torvalds * We don't do much here, just schedule handling by raid1d
19181da177e4SLinus Torvalds */
19194e4cbee9SChristoph Hellwig if (!bio->bi_status)
19201da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state);
1921d11c171eSNeilBrown
1922d11c171eSNeilBrown if (atomic_dec_and_test(&r1_bio->remaining))
19231da177e4SLinus Torvalds reschedule_retry(r1_bio);
19241da177e4SLinus Torvalds }
19251da177e4SLinus Torvalds
abort_sync_write(struct mddev * mddev,struct r1bio * r1_bio)1926dfcc34c9SNate Dailey static void abort_sync_write(struct mddev *mddev, struct r1bio *r1_bio)
1927dfcc34c9SNate Dailey {
1928dfcc34c9SNate Dailey sector_t sync_blocks = 0;
1929dfcc34c9SNate Dailey sector_t s = r1_bio->sector;
1930dfcc34c9SNate Dailey long sectors_to_go = r1_bio->sectors;
1931dfcc34c9SNate Dailey
1932dfcc34c9SNate Dailey /* make sure these bits don't get cleared. */
1933dfcc34c9SNate Dailey do {
1934dfcc34c9SNate Dailey md_bitmap_end_sync(mddev->bitmap, s, &sync_blocks, 1);
1935dfcc34c9SNate Dailey s += sync_blocks;
1936dfcc34c9SNate Dailey sectors_to_go -= sync_blocks;
1937dfcc34c9SNate Dailey } while (sectors_to_go > 0);
1938dfcc34c9SNate Dailey }
1939dfcc34c9SNate Dailey
put_sync_write_buf(struct r1bio * r1_bio,int uptodate)1940449808a2SHou Tao static void put_sync_write_buf(struct r1bio *r1_bio, int uptodate)
1941449808a2SHou Tao {
1942449808a2SHou Tao if (atomic_dec_and_test(&r1_bio->remaining)) {
1943449808a2SHou Tao struct mddev *mddev = r1_bio->mddev;
1944449808a2SHou Tao int s = r1_bio->sectors;
1945449808a2SHou Tao
1946449808a2SHou Tao if (test_bit(R1BIO_MadeGood, &r1_bio->state) ||
1947449808a2SHou Tao test_bit(R1BIO_WriteError, &r1_bio->state))
1948449808a2SHou Tao reschedule_retry(r1_bio);
1949449808a2SHou Tao else {
1950449808a2SHou Tao put_buf(r1_bio);
1951449808a2SHou Tao md_done_sync(mddev, s, uptodate);
1952449808a2SHou Tao }
1953449808a2SHou Tao }
1954449808a2SHou Tao }
1955449808a2SHou Tao
end_sync_write(struct bio * bio)19564246a0b6SChristoph Hellwig static void end_sync_write(struct bio *bio)
19571da177e4SLinus Torvalds {
19584e4cbee9SChristoph Hellwig int uptodate = !bio->bi_status;
195998d30c58SMing Lei struct r1bio *r1_bio = get_resync_r1bio(bio);
1960fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev;
1961e8096360SNeilBrown struct r1conf *conf = mddev->private;
19624367af55SNeilBrown sector_t first_bad;
19634367af55SNeilBrown int bad_sectors;
1964854abd75SNeilBrown struct md_rdev *rdev = conf->mirrors[find_bio_disk(r1_bio, bio)].rdev;
1965ba3ae3beSNamhyung Kim
19666b1117d5SNeilBrown if (!uptodate) {
1967dfcc34c9SNate Dailey abort_sync_write(mddev, r1_bio);
1968854abd75SNeilBrown set_bit(WriteErrorSeen, &rdev->flags);
1969854abd75SNeilBrown if (!test_and_set_bit(WantReplacement, &rdev->flags))
197019d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, &
197119d67169SNeilBrown mddev->recovery);
1972d8f05d29SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state);
1973854abd75SNeilBrown } else if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors,
19743a9f28a5SNeilBrown &first_bad, &bad_sectors) &&
19753a9f28a5SNeilBrown !is_badblock(conf->mirrors[r1_bio->read_disk].rdev,
19763a9f28a5SNeilBrown r1_bio->sector,
19773a9f28a5SNeilBrown r1_bio->sectors,
19783a9f28a5SNeilBrown &first_bad, &bad_sectors)
19793a9f28a5SNeilBrown )
19804367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state);
1981e3b9703eSNeilBrown
1982449808a2SHou Tao put_sync_write_buf(r1_bio, uptodate);
19834367af55SNeilBrown }
19841da177e4SLinus Torvalds
r1_sync_page_io(struct md_rdev * rdev,sector_t sector,int sectors,struct page * page,blk_opf_t rw)19853cb03002SNeilBrown static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector,
19866dcd8846SBart Van Assche int sectors, struct page *page, blk_opf_t rw)
1987d8f05d29SNeilBrown {
19884ce4c73fSBart Van Assche if (sync_page_io(rdev, sector, sectors << 9, page, rw, false))
1989d8f05d29SNeilBrown /* success */
1990d8f05d29SNeilBrown return 1;
19916dcd8846SBart Van Assche if (rw == REQ_OP_WRITE) {
1992d8f05d29SNeilBrown set_bit(WriteErrorSeen, &rdev->flags);
199319d67169SNeilBrown if (!test_and_set_bit(WantReplacement,
199419d67169SNeilBrown &rdev->flags))
199519d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, &
199619d67169SNeilBrown rdev->mddev->recovery);
199719d67169SNeilBrown }
1998d8f05d29SNeilBrown /* need to record an error - either for the block or the device */
1999d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sector, sectors, 0))
2000d8f05d29SNeilBrown md_error(rdev->mddev, rdev);
2001d8f05d29SNeilBrown return 0;
2002d8f05d29SNeilBrown }
2003d8f05d29SNeilBrown
fix_sync_read_error(struct r1bio * r1_bio)20049f2c9d12SNeilBrown static int fix_sync_read_error(struct r1bio *r1_bio)
20051da177e4SLinus Torvalds {
2006a68e5870SNeilBrown /* Try some synchronous reads of other devices to get
200769382e85SNeilBrown * good data, much like with normal read errors. Only
2008ddac7c7eSNeilBrown * read into the pages we already have so we don't
200969382e85SNeilBrown * need to re-issue the read request.
201069382e85SNeilBrown * We don't need to freeze the array, because being in an
201169382e85SNeilBrown * active sync request, there is no normal IO, and
201269382e85SNeilBrown * no overlapping syncs.
201306f60385SNeilBrown * We don't need to check is_badblock() again as we
201406f60385SNeilBrown * made sure that anything with a bad block in range
201506f60385SNeilBrown * will have bi_end_io clear.
20161da177e4SLinus Torvalds */
2017fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev;
2018e8096360SNeilBrown struct r1conf *conf = mddev->private;
2019a68e5870SNeilBrown struct bio *bio = r1_bio->bios[r1_bio->read_disk];
202044cf0f4dSMing Lei struct page **pages = get_resync_pages(bio)->pages;
202169382e85SNeilBrown sector_t sect = r1_bio->sector;
202269382e85SNeilBrown int sectors = r1_bio->sectors;
202369382e85SNeilBrown int idx = 0;
20242e52d449SNeilBrown struct md_rdev *rdev;
20252e52d449SNeilBrown
20262e52d449SNeilBrown rdev = conf->mirrors[r1_bio->read_disk].rdev;
20272e52d449SNeilBrown if (test_bit(FailFast, &rdev->flags)) {
20282e52d449SNeilBrown /* Don't try recovering from here - just fail it
20292e52d449SNeilBrown * ... unless it is the last working device of course */
20302e52d449SNeilBrown md_error(mddev, rdev);
20312e52d449SNeilBrown if (test_bit(Faulty, &rdev->flags))
20322e52d449SNeilBrown /* Don't try to read from here, but make sure
20332e52d449SNeilBrown * put_buf does it's thing
20342e52d449SNeilBrown */
20352e52d449SNeilBrown bio->bi_end_io = end_sync_write;
20362e52d449SNeilBrown }
203769382e85SNeilBrown
203869382e85SNeilBrown while(sectors) {
203969382e85SNeilBrown int s = sectors;
204069382e85SNeilBrown int d = r1_bio->read_disk;
204169382e85SNeilBrown int success = 0;
204278d7f5f7SNeilBrown int start;
204369382e85SNeilBrown
204469382e85SNeilBrown if (s > (PAGE_SIZE>>9))
204569382e85SNeilBrown s = PAGE_SIZE >> 9;
204669382e85SNeilBrown do {
204769382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io == end_sync_read) {
2048ddac7c7eSNeilBrown /* No rcu protection needed here devices
2049ddac7c7eSNeilBrown * can only be removed when no resync is
2050ddac7c7eSNeilBrown * active, and resync is currently active
2051ddac7c7eSNeilBrown */
205269382e85SNeilBrown rdev = conf->mirrors[d].rdev;
20539d3d8011SNamhyung Kim if (sync_page_io(rdev, sect, s<<9,
205444cf0f4dSMing Lei pages[idx],
20554ce4c73fSBart Van Assche REQ_OP_READ, false)) {
205669382e85SNeilBrown success = 1;
205769382e85SNeilBrown break;
205869382e85SNeilBrown }
205969382e85SNeilBrown }
206069382e85SNeilBrown d++;
20618f19ccb2SNeilBrown if (d == conf->raid_disks * 2)
206269382e85SNeilBrown d = 0;
206369382e85SNeilBrown } while (!success && d != r1_bio->read_disk);
206469382e85SNeilBrown
206578d7f5f7SNeilBrown if (!success) {
20663a9f28a5SNeilBrown int abort = 0;
20673a9f28a5SNeilBrown /* Cannot read from anywhere, this block is lost.
20683a9f28a5SNeilBrown * Record a bad block on each device. If that doesn't
20693a9f28a5SNeilBrown * work just disable and interrupt the recovery.
20703a9f28a5SNeilBrown * Don't fail devices as that won't really help.
20713a9f28a5SNeilBrown */
2072ac483eb3SChristoph Hellwig pr_crit_ratelimited("md/raid1:%s: %pg: unrecoverable I/O read error for block %llu\n",
2073ac483eb3SChristoph Hellwig mdname(mddev), bio->bi_bdev,
207478d7f5f7SNeilBrown (unsigned long long)r1_bio->sector);
20758f19ccb2SNeilBrown for (d = 0; d < conf->raid_disks * 2; d++) {
20763a9f28a5SNeilBrown rdev = conf->mirrors[d].rdev;
20773a9f28a5SNeilBrown if (!rdev || test_bit(Faulty, &rdev->flags))
20783a9f28a5SNeilBrown continue;
20793a9f28a5SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0))
20803a9f28a5SNeilBrown abort = 1;
20813a9f28a5SNeilBrown }
20823a9f28a5SNeilBrown if (abort) {
2083d890fa2bSNeilBrown conf->recovery_disabled =
2084d890fa2bSNeilBrown mddev->recovery_disabled;
20853a9f28a5SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery);
208678d7f5f7SNeilBrown md_done_sync(mddev, r1_bio->sectors, 0);
208778d7f5f7SNeilBrown put_buf(r1_bio);
208878d7f5f7SNeilBrown return 0;
208978d7f5f7SNeilBrown }
20903a9f28a5SNeilBrown /* Try next page */
20913a9f28a5SNeilBrown sectors -= s;
20923a9f28a5SNeilBrown sect += s;
20933a9f28a5SNeilBrown idx++;
20943a9f28a5SNeilBrown continue;
20953a9f28a5SNeilBrown }
209678d7f5f7SNeilBrown
209778d7f5f7SNeilBrown start = d;
209869382e85SNeilBrown /* write it back and re-read */
209969382e85SNeilBrown while (d != r1_bio->read_disk) {
210069382e85SNeilBrown if (d == 0)
21018f19ccb2SNeilBrown d = conf->raid_disks * 2;
210269382e85SNeilBrown d--;
210369382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read)
210469382e85SNeilBrown continue;
210569382e85SNeilBrown rdev = conf->mirrors[d].rdev;
2106d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s,
210744cf0f4dSMing Lei pages[idx],
21086dcd8846SBart Van Assche REQ_OP_WRITE) == 0) {
210978d7f5f7SNeilBrown r1_bio->bios[d]->bi_end_io = NULL;
211078d7f5f7SNeilBrown rdev_dec_pending(rdev, mddev);
21119d3d8011SNamhyung Kim }
2112097426f6SNeilBrown }
2113097426f6SNeilBrown d = start;
2114097426f6SNeilBrown while (d != r1_bio->read_disk) {
2115097426f6SNeilBrown if (d == 0)
21168f19ccb2SNeilBrown d = conf->raid_disks * 2;
2117097426f6SNeilBrown d--;
2118097426f6SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read)
2119097426f6SNeilBrown continue;
2120097426f6SNeilBrown rdev = conf->mirrors[d].rdev;
2121d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s,
212244cf0f4dSMing Lei pages[idx],
21236dcd8846SBart Van Assche REQ_OP_READ) != 0)
21249d3d8011SNamhyung Kim atomic_add(s, &rdev->corrected_errors);
212569382e85SNeilBrown }
212669382e85SNeilBrown sectors -= s;
212769382e85SNeilBrown sect += s;
212869382e85SNeilBrown idx ++;
212969382e85SNeilBrown }
213078d7f5f7SNeilBrown set_bit(R1BIO_Uptodate, &r1_bio->state);
21314e4cbee9SChristoph Hellwig bio->bi_status = 0;
2132a68e5870SNeilBrown return 1;
213369382e85SNeilBrown }
2134d11c171eSNeilBrown
process_checks(struct r1bio * r1_bio)2135c95e6385SNeilBrown static void process_checks(struct r1bio *r1_bio)
2136a68e5870SNeilBrown {
2137a68e5870SNeilBrown /* We have read all readable devices. If we haven't
2138a68e5870SNeilBrown * got the block, then there is no hope left.
2139a68e5870SNeilBrown * If we have, then we want to do a comparison
2140a68e5870SNeilBrown * and skip the write if everything is the same.
2141a68e5870SNeilBrown * If any blocks failed to read, then we need to
2142a68e5870SNeilBrown * attempt an over-write
2143a68e5870SNeilBrown */
2144fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev;
2145e8096360SNeilBrown struct r1conf *conf = mddev->private;
2146a68e5870SNeilBrown int primary;
2147a68e5870SNeilBrown int i;
2148f4380a91Smajianpeng int vcnt;
2149a68e5870SNeilBrown
215030bc9b53SNeilBrown /* Fix variable parts of all bios */
215130bc9b53SNeilBrown vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9);
215230bc9b53SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) {
21534e4cbee9SChristoph Hellwig blk_status_t status;
215430bc9b53SNeilBrown struct bio *b = r1_bio->bios[i];
215598d30c58SMing Lei struct resync_pages *rp = get_resync_pages(b);
215630bc9b53SNeilBrown if (b->bi_end_io != end_sync_read)
215730bc9b53SNeilBrown continue;
21584246a0b6SChristoph Hellwig /* fixup the bio for reuse, but preserve errno */
21594e4cbee9SChristoph Hellwig status = b->bi_status;
2160a7c50c94SChristoph Hellwig bio_reset(b, conf->mirrors[i].rdev->bdev, REQ_OP_READ);
21614e4cbee9SChristoph Hellwig b->bi_status = status;
21624f024f37SKent Overstreet b->bi_iter.bi_sector = r1_bio->sector +
216330bc9b53SNeilBrown conf->mirrors[i].rdev->data_offset;
216430bc9b53SNeilBrown b->bi_end_io = end_sync_read;
216598d30c58SMing Lei rp->raid_bio = r1_bio;
216698d30c58SMing Lei b->bi_private = rp;
216730bc9b53SNeilBrown
2168fb0eb5dfSMing Lei /* initialize bvec table again */
2169fb0eb5dfSMing Lei md_bio_reset_resync_pages(b, rp, r1_bio->sectors << 9);
217030bc9b53SNeilBrown }
21718f19ccb2SNeilBrown for (primary = 0; primary < conf->raid_disks * 2; primary++)
2172a68e5870SNeilBrown if (r1_bio->bios[primary]->bi_end_io == end_sync_read &&
21734e4cbee9SChristoph Hellwig !r1_bio->bios[primary]->bi_status) {
2174a68e5870SNeilBrown r1_bio->bios[primary]->bi_end_io = NULL;
2175a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[primary].rdev, mddev);
2176a68e5870SNeilBrown break;
2177a68e5870SNeilBrown }
2178a68e5870SNeilBrown r1_bio->read_disk = primary;
21798f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) {
21802b070cfeSChristoph Hellwig int j = 0;
2181a68e5870SNeilBrown struct bio *pbio = r1_bio->bios[primary];
2182a68e5870SNeilBrown struct bio *sbio = r1_bio->bios[i];
21834e4cbee9SChristoph Hellwig blk_status_t status = sbio->bi_status;
218444cf0f4dSMing Lei struct page **ppages = get_resync_pages(pbio)->pages;
218544cf0f4dSMing Lei struct page **spages = get_resync_pages(sbio)->pages;
218660928a91SMing Lei struct bio_vec *bi;
21878fc04e6eSMing Lei int page_len[RESYNC_PAGES] = { 0 };
21886dc4f100SMing Lei struct bvec_iter_all iter_all;
218978d7f5f7SNeilBrown
21902aabaa65SKent Overstreet if (sbio->bi_end_io != end_sync_read)
219178d7f5f7SNeilBrown continue;
21924246a0b6SChristoph Hellwig /* Now we can 'fixup' the error value */
21934e4cbee9SChristoph Hellwig sbio->bi_status = 0;
2194a68e5870SNeilBrown
21952b070cfeSChristoph Hellwig bio_for_each_segment_all(bi, sbio, iter_all)
21962b070cfeSChristoph Hellwig page_len[j++] = bi->bv_len;
219760928a91SMing Lei
21984e4cbee9SChristoph Hellwig if (!status) {
2199a68e5870SNeilBrown for (j = vcnt; j-- ; ) {
220044cf0f4dSMing Lei if (memcmp(page_address(ppages[j]),
220144cf0f4dSMing Lei page_address(spages[j]),
220260928a91SMing Lei page_len[j]))
2203a68e5870SNeilBrown break;
2204a68e5870SNeilBrown }
2205a68e5870SNeilBrown } else
2206a68e5870SNeilBrown j = 0;
2207a68e5870SNeilBrown if (j >= 0)
22087f7583d4SJianpeng Ma atomic64_add(r1_bio->sectors, &mddev->resync_mismatches);
2209a68e5870SNeilBrown if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)
22104e4cbee9SChristoph Hellwig && !status)) {
221178d7f5f7SNeilBrown /* No need to write to this device. */
2212a68e5870SNeilBrown sbio->bi_end_io = NULL;
2213a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, mddev);
221478d7f5f7SNeilBrown continue;
221578d7f5f7SNeilBrown }
2216d3b45c2aSKent Overstreet
2217d3b45c2aSKent Overstreet bio_copy_data(sbio, pbio);
2218a68e5870SNeilBrown }
2219a68e5870SNeilBrown }
2220a68e5870SNeilBrown
sync_request_write(struct mddev * mddev,struct r1bio * r1_bio)22219f2c9d12SNeilBrown static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio)
2222a68e5870SNeilBrown {
2223e8096360SNeilBrown struct r1conf *conf = mddev->private;
2224a68e5870SNeilBrown int i;
22258f19ccb2SNeilBrown int disks = conf->raid_disks * 2;
2226037d2ff6SGuoqing Jiang struct bio *wbio;
2227a68e5870SNeilBrown
2228a68e5870SNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state))
2229a68e5870SNeilBrown /* ouch - failed to read all of that. */
2230a68e5870SNeilBrown if (!fix_sync_read_error(r1_bio))
2231a68e5870SNeilBrown return;
22327ca78d57SNeilBrown
22337ca78d57SNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2234c95e6385SNeilBrown process_checks(r1_bio);
2235c95e6385SNeilBrown
2236d11c171eSNeilBrown /*
2237d11c171eSNeilBrown * schedule writes
2238d11c171eSNeilBrown */
22391da177e4SLinus Torvalds atomic_set(&r1_bio->remaining, 1);
22401da177e4SLinus Torvalds for (i = 0; i < disks ; i++) {
22411da177e4SLinus Torvalds wbio = r1_bio->bios[i];
22423e198f78SNeilBrown if (wbio->bi_end_io == NULL ||
22433e198f78SNeilBrown (wbio->bi_end_io == end_sync_read &&
22443e198f78SNeilBrown (i == r1_bio->read_disk ||
22453e198f78SNeilBrown !test_bit(MD_RECOVERY_SYNC, &mddev->recovery))))
22461da177e4SLinus Torvalds continue;
2247dfcc34c9SNate Dailey if (test_bit(Faulty, &conf->mirrors[i].rdev->flags)) {
2248dfcc34c9SNate Dailey abort_sync_write(mddev, r1_bio);
22490c9d5b12SNeilBrown continue;
2250dfcc34c9SNate Dailey }
22511da177e4SLinus Torvalds
2252c34b7ac6SChristoph Hellwig wbio->bi_opf = REQ_OP_WRITE;
2253212e7eb7SNeilBrown if (test_bit(FailFast, &conf->mirrors[i].rdev->flags))
2254212e7eb7SNeilBrown wbio->bi_opf |= MD_FAILFAST;
2255212e7eb7SNeilBrown
22563e198f78SNeilBrown wbio->bi_end_io = end_sync_write;
22571da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining);
2258aa8b57aaSKent Overstreet md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio));
2259191ea9b2SNeilBrown
2260ed00aabdSChristoph Hellwig submit_bio_noacct(wbio);
22611da177e4SLinus Torvalds }
22621da177e4SLinus Torvalds
2263449808a2SHou Tao put_sync_write_buf(r1_bio, 1);
22641da177e4SLinus Torvalds }
22651da177e4SLinus Torvalds
22661da177e4SLinus Torvalds /*
22671da177e4SLinus Torvalds * This is a kernel thread which:
22681da177e4SLinus Torvalds *
22691da177e4SLinus Torvalds * 1. Retries failed read operations on working mirrors.
22701da177e4SLinus Torvalds * 2. Updates the raid superblock when problems encounter.
2271d2eb35acSNeilBrown * 3. Performs writes following reads for array synchronising.
22721da177e4SLinus Torvalds */
22731da177e4SLinus Torvalds
fix_read_error(struct r1conf * conf,int read_disk,sector_t sect,int sectors)2274e8096360SNeilBrown static void fix_read_error(struct r1conf *conf, int read_disk,
2275867868fbSNeilBrown sector_t sect, int sectors)
2276867868fbSNeilBrown {
2277fd01b88cSNeilBrown struct mddev *mddev = conf->mddev;
2278867868fbSNeilBrown while(sectors) {
2279867868fbSNeilBrown int s = sectors;
2280867868fbSNeilBrown int d = read_disk;
2281867868fbSNeilBrown int success = 0;
2282867868fbSNeilBrown int start;
22833cb03002SNeilBrown struct md_rdev *rdev;
2284867868fbSNeilBrown
2285867868fbSNeilBrown if (s > (PAGE_SIZE>>9))
2286867868fbSNeilBrown s = PAGE_SIZE >> 9;
2287867868fbSNeilBrown
2288867868fbSNeilBrown do {
2289d2eb35acSNeilBrown sector_t first_bad;
2290d2eb35acSNeilBrown int bad_sectors;
2291d2eb35acSNeilBrown
2292707a6a42SNeilBrown rcu_read_lock();
2293707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev);
2294867868fbSNeilBrown if (rdev &&
2295da8840a7Smajianpeng (test_bit(In_sync, &rdev->flags) ||
2296da8840a7Smajianpeng (!test_bit(Faulty, &rdev->flags) &&
2297da8840a7Smajianpeng rdev->recovery_offset >= sect + s)) &&
2298d2eb35acSNeilBrown is_badblock(rdev, sect, s,
2299707a6a42SNeilBrown &first_bad, &bad_sectors) == 0) {
2300707a6a42SNeilBrown atomic_inc(&rdev->nr_pending);
2301707a6a42SNeilBrown rcu_read_unlock();
2302707a6a42SNeilBrown if (sync_page_io(rdev, sect, s<<9,
23034ce4c73fSBart Van Assche conf->tmppage, REQ_OP_READ, false))
2304867868fbSNeilBrown success = 1;
2305707a6a42SNeilBrown rdev_dec_pending(rdev, mddev);
2306707a6a42SNeilBrown if (success)
2307707a6a42SNeilBrown break;
2308707a6a42SNeilBrown } else
2309707a6a42SNeilBrown rcu_read_unlock();
2310867868fbSNeilBrown d++;
23118f19ccb2SNeilBrown if (d == conf->raid_disks * 2)
2312867868fbSNeilBrown d = 0;
231302c67a3bSLi Nan } while (d != read_disk);
2314867868fbSNeilBrown
2315867868fbSNeilBrown if (!success) {
2316d8f05d29SNeilBrown /* Cannot read from anywhere - mark it bad */
23173cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[read_disk].rdev;
2318d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0))
2319d8f05d29SNeilBrown md_error(mddev, rdev);
2320867868fbSNeilBrown break;
2321867868fbSNeilBrown }
2322867868fbSNeilBrown /* write it back and re-read */
2323867868fbSNeilBrown start = d;
2324867868fbSNeilBrown while (d != read_disk) {
2325867868fbSNeilBrown if (d==0)
23268f19ccb2SNeilBrown d = conf->raid_disks * 2;
2327867868fbSNeilBrown d--;
2328707a6a42SNeilBrown rcu_read_lock();
2329707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev);
2330867868fbSNeilBrown if (rdev &&
2331707a6a42SNeilBrown !test_bit(Faulty, &rdev->flags)) {
2332707a6a42SNeilBrown atomic_inc(&rdev->nr_pending);
2333707a6a42SNeilBrown rcu_read_unlock();
2334d8f05d29SNeilBrown r1_sync_page_io(rdev, sect, s,
23356dcd8846SBart Van Assche conf->tmppage, REQ_OP_WRITE);
2336707a6a42SNeilBrown rdev_dec_pending(rdev, mddev);
2337707a6a42SNeilBrown } else
2338707a6a42SNeilBrown rcu_read_unlock();
2339867868fbSNeilBrown }
2340867868fbSNeilBrown d = start;
2341867868fbSNeilBrown while (d != read_disk) {
2342867868fbSNeilBrown if (d==0)
23438f19ccb2SNeilBrown d = conf->raid_disks * 2;
2344867868fbSNeilBrown d--;
2345707a6a42SNeilBrown rcu_read_lock();
2346707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev);
2347867868fbSNeilBrown if (rdev &&
2348b8cb6b4cSNeilBrown !test_bit(Faulty, &rdev->flags)) {
2349707a6a42SNeilBrown atomic_inc(&rdev->nr_pending);
2350707a6a42SNeilBrown rcu_read_unlock();
2351d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s,
23526dcd8846SBart Van Assche conf->tmppage, REQ_OP_READ)) {
2353867868fbSNeilBrown atomic_add(s, &rdev->corrected_errors);
2354913cce5aSChristoph Hellwig pr_info("md/raid1:%s: read error corrected (%d sectors at %llu on %pg)\n",
2355867868fbSNeilBrown mdname(mddev), s,
2356969b755aSRandy Dunlap (unsigned long long)(sect +
2357969b755aSRandy Dunlap rdev->data_offset),
2358913cce5aSChristoph Hellwig rdev->bdev);
2359867868fbSNeilBrown }
2360707a6a42SNeilBrown rdev_dec_pending(rdev, mddev);
2361707a6a42SNeilBrown } else
2362707a6a42SNeilBrown rcu_read_unlock();
2363867868fbSNeilBrown }
2364867868fbSNeilBrown sectors -= s;
2365867868fbSNeilBrown sect += s;
2366867868fbSNeilBrown }
2367867868fbSNeilBrown }
2368867868fbSNeilBrown
narrow_write_error(struct r1bio * r1_bio,int i)23699f2c9d12SNeilBrown static int narrow_write_error(struct r1bio *r1_bio, int i)
2370cd5ff9a1SNeilBrown {
2371fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev;
2372e8096360SNeilBrown struct r1conf *conf = mddev->private;
23733cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev;
2374cd5ff9a1SNeilBrown
2375cd5ff9a1SNeilBrown /* bio has the data to be written to device 'i' where
2376cd5ff9a1SNeilBrown * we just recently had a write error.
2377cd5ff9a1SNeilBrown * We repeatedly clone the bio and trim down to one block,
2378cd5ff9a1SNeilBrown * then try the write. Where the write fails we record
2379cd5ff9a1SNeilBrown * a bad block.
2380cd5ff9a1SNeilBrown * It is conceivable that the bio doesn't exactly align with
2381cd5ff9a1SNeilBrown * blocks. We must handle this somehow.
2382cd5ff9a1SNeilBrown *
2383cd5ff9a1SNeilBrown * We currently own a reference on the rdev.
2384cd5ff9a1SNeilBrown */
2385cd5ff9a1SNeilBrown
2386cd5ff9a1SNeilBrown int block_sectors;
2387cd5ff9a1SNeilBrown sector_t sector;
2388cd5ff9a1SNeilBrown int sectors;
2389cd5ff9a1SNeilBrown int sect_to_write = r1_bio->sectors;
2390cd5ff9a1SNeilBrown int ok = 1;
2391cd5ff9a1SNeilBrown
2392cd5ff9a1SNeilBrown if (rdev->badblocks.shift < 0)
2393cd5ff9a1SNeilBrown return 0;
2394cd5ff9a1SNeilBrown
2395ab713cdcSNate Dailey block_sectors = roundup(1 << rdev->badblocks.shift,
2396ab713cdcSNate Dailey bdev_logical_block_size(rdev->bdev) >> 9);
2397cd5ff9a1SNeilBrown sector = r1_bio->sector;
2398cd5ff9a1SNeilBrown sectors = ((sector + block_sectors)
2399cd5ff9a1SNeilBrown & ~(sector_t)(block_sectors - 1))
2400cd5ff9a1SNeilBrown - sector;
2401cd5ff9a1SNeilBrown
2402cd5ff9a1SNeilBrown while (sect_to_write) {
2403cd5ff9a1SNeilBrown struct bio *wbio;
2404cd5ff9a1SNeilBrown if (sectors > sect_to_write)
2405cd5ff9a1SNeilBrown sectors = sect_to_write;
2406cd5ff9a1SNeilBrown /* Write at 'sector' for 'sectors'*/
2407cd5ff9a1SNeilBrown
2408b783863fSKent Overstreet if (test_bit(R1BIO_BehindIO, &r1_bio->state)) {
2409abfc426dSChristoph Hellwig wbio = bio_alloc_clone(rdev->bdev,
2410abfc426dSChristoph Hellwig r1_bio->behind_master_bio,
2411abfc426dSChristoph Hellwig GFP_NOIO, &mddev->bio_set);
2412b783863fSKent Overstreet } else {
2413abfc426dSChristoph Hellwig wbio = bio_alloc_clone(rdev->bdev, r1_bio->master_bio,
2414abfc426dSChristoph Hellwig GFP_NOIO, &mddev->bio_set);
2415b783863fSKent Overstreet }
2416b783863fSKent Overstreet
2417c34b7ac6SChristoph Hellwig wbio->bi_opf = REQ_OP_WRITE;
24184f024f37SKent Overstreet wbio->bi_iter.bi_sector = r1_bio->sector;
24194f024f37SKent Overstreet wbio->bi_iter.bi_size = r1_bio->sectors << 9;
2420cd5ff9a1SNeilBrown
24216678d83fSKent Overstreet bio_trim(wbio, sector - r1_bio->sector, sectors);
24224f024f37SKent Overstreet wbio->bi_iter.bi_sector += rdev->data_offset;
24234e49ea4aSMike Christie
24244e49ea4aSMike Christie if (submit_bio_wait(wbio) < 0)
2425cd5ff9a1SNeilBrown /* failure! */
2426cd5ff9a1SNeilBrown ok = rdev_set_badblocks(rdev, sector,
2427cd5ff9a1SNeilBrown sectors, 0)
2428cd5ff9a1SNeilBrown && ok;
2429cd5ff9a1SNeilBrown
2430cd5ff9a1SNeilBrown bio_put(wbio);
2431cd5ff9a1SNeilBrown sect_to_write -= sectors;
2432cd5ff9a1SNeilBrown sector += sectors;
2433cd5ff9a1SNeilBrown sectors = block_sectors;
2434cd5ff9a1SNeilBrown }
2435cd5ff9a1SNeilBrown return ok;
2436cd5ff9a1SNeilBrown }
2437cd5ff9a1SNeilBrown
handle_sync_write_finished(struct r1conf * conf,struct r1bio * r1_bio)2438e8096360SNeilBrown static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio)
243962096bceSNeilBrown {
244062096bceSNeilBrown int m;
244162096bceSNeilBrown int s = r1_bio->sectors;
24428f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) {
24433cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev;
244462096bceSNeilBrown struct bio *bio = r1_bio->bios[m];
244562096bceSNeilBrown if (bio->bi_end_io == NULL)
244662096bceSNeilBrown continue;
24474e4cbee9SChristoph Hellwig if (!bio->bi_status &&
244862096bceSNeilBrown test_bit(R1BIO_MadeGood, &r1_bio->state)) {
2449c6563a8cSNeilBrown rdev_clear_badblocks(rdev, r1_bio->sector, s, 0);
245062096bceSNeilBrown }
24514e4cbee9SChristoph Hellwig if (bio->bi_status &&
245262096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) {
245362096bceSNeilBrown if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0))
245462096bceSNeilBrown md_error(conf->mddev, rdev);
245562096bceSNeilBrown }
245662096bceSNeilBrown }
245762096bceSNeilBrown put_buf(r1_bio);
245862096bceSNeilBrown md_done_sync(conf->mddev, s, 1);
245962096bceSNeilBrown }
246062096bceSNeilBrown
handle_write_finished(struct r1conf * conf,struct r1bio * r1_bio)2461e8096360SNeilBrown static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio)
246262096bceSNeilBrown {
2463fd76863eScolyli@suse.de int m, idx;
246455ce74d4SNeilBrown bool fail = false;
2465fd76863eScolyli@suse.de
24668f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++)
246762096bceSNeilBrown if (r1_bio->bios[m] == IO_MADE_GOOD) {
24683cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev;
246962096bceSNeilBrown rdev_clear_badblocks(rdev,
247062096bceSNeilBrown r1_bio->sector,
2471c6563a8cSNeilBrown r1_bio->sectors, 0);
247262096bceSNeilBrown rdev_dec_pending(rdev, conf->mddev);
247362096bceSNeilBrown } else if (r1_bio->bios[m] != NULL) {
247462096bceSNeilBrown /* This drive got a write error. We need to
247562096bceSNeilBrown * narrow down and record precise write
247662096bceSNeilBrown * errors.
247762096bceSNeilBrown */
247855ce74d4SNeilBrown fail = true;
247962096bceSNeilBrown if (!narrow_write_error(r1_bio, m)) {
248062096bceSNeilBrown md_error(conf->mddev,
248162096bceSNeilBrown conf->mirrors[m].rdev);
248262096bceSNeilBrown /* an I/O failed, we can't clear the bitmap */
248362096bceSNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state);
248462096bceSNeilBrown }
248562096bceSNeilBrown rdev_dec_pending(conf->mirrors[m].rdev,
248662096bceSNeilBrown conf->mddev);
248762096bceSNeilBrown }
248855ce74d4SNeilBrown if (fail) {
248955ce74d4SNeilBrown spin_lock_irq(&conf->device_lock);
249055ce74d4SNeilBrown list_add(&r1_bio->retry_list, &conf->bio_end_io_list);
2491fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector);
2492824e47daScolyli@suse.de atomic_inc(&conf->nr_queued[idx]);
249355ce74d4SNeilBrown spin_unlock_irq(&conf->device_lock);
2494824e47daScolyli@suse.de /*
2495824e47daScolyli@suse.de * In case freeze_array() is waiting for condition
2496824e47daScolyli@suse.de * get_unqueued_pending() == extra to be true.
2497824e47daScolyli@suse.de */
2498824e47daScolyli@suse.de wake_up(&conf->wait_barrier);
249955ce74d4SNeilBrown md_wakeup_thread(conf->mddev->thread);
2500bd8688a1SNeilBrown } else {
2501bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state))
2502bd8688a1SNeilBrown close_write(r1_bio);
250362096bceSNeilBrown raid_end_bio_io(r1_bio);
250462096bceSNeilBrown }
2505bd8688a1SNeilBrown }
250662096bceSNeilBrown
handle_read_error(struct r1conf * conf,struct r1bio * r1_bio)2507e8096360SNeilBrown static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio)
250862096bceSNeilBrown {
2509fd01b88cSNeilBrown struct mddev *mddev = conf->mddev;
251062096bceSNeilBrown struct bio *bio;
25113cb03002SNeilBrown struct md_rdev *rdev;
2512c069da44SXueshi Hu sector_t sector;
251362096bceSNeilBrown
251462096bceSNeilBrown clear_bit(R1BIO_ReadError, &r1_bio->state);
251562096bceSNeilBrown /* we got a read error. Maybe the drive is bad. Maybe just
251662096bceSNeilBrown * the block and we can fix it.
251762096bceSNeilBrown * We freeze all other IO, and try reading the block from
251862096bceSNeilBrown * other devices. When we find one, we re-write
251962096bceSNeilBrown * and check it that fixes the read error.
252062096bceSNeilBrown * This is all done synchronously while the array is
252162096bceSNeilBrown * frozen
252262096bceSNeilBrown */
25237449f699STomasz Majchrzak
25247449f699STomasz Majchrzak bio = r1_bio->bios[r1_bio->read_disk];
25257449f699STomasz Majchrzak bio_put(bio);
25267449f699STomasz Majchrzak r1_bio->bios[r1_bio->read_disk] = NULL;
25277449f699STomasz Majchrzak
25282e52d449SNeilBrown rdev = conf->mirrors[r1_bio->read_disk].rdev;
25292e52d449SNeilBrown if (mddev->ro == 0
25302e52d449SNeilBrown && !test_bit(FailFast, &rdev->flags)) {
2531e2d59925SNeilBrown freeze_array(conf, 1);
253262096bceSNeilBrown fix_read_error(conf, r1_bio->read_disk,
253362096bceSNeilBrown r1_bio->sector, r1_bio->sectors);
253462096bceSNeilBrown unfreeze_array(conf);
2535b33d1062SGioh Kim } else if (mddev->ro == 0 && test_bit(FailFast, &rdev->flags)) {
2536b33d1062SGioh Kim md_error(mddev, rdev);
25377449f699STomasz Majchrzak } else {
25387449f699STomasz Majchrzak r1_bio->bios[r1_bio->read_disk] = IO_BLOCKED;
25397449f699STomasz Majchrzak }
25407449f699STomasz Majchrzak
25412e52d449SNeilBrown rdev_dec_pending(rdev, conf->mddev);
2542c069da44SXueshi Hu sector = r1_bio->sector;
2543689389a0SNeilBrown bio = r1_bio->master_bio;
254462096bceSNeilBrown
2545689389a0SNeilBrown /* Reuse the old r1_bio so that the IO_BLOCKED settings are preserved */
2546689389a0SNeilBrown r1_bio->state = 0;
2547689389a0SNeilBrown raid1_read_request(mddev, bio, r1_bio->sectors, r1_bio);
2548c069da44SXueshi Hu allow_barrier(conf, sector);
2549109e3765SNeilBrown }
255062096bceSNeilBrown
raid1d(struct md_thread * thread)25514ed8731dSShaohua Li static void raid1d(struct md_thread *thread)
25521da177e4SLinus Torvalds {
25534ed8731dSShaohua Li struct mddev *mddev = thread->mddev;
25549f2c9d12SNeilBrown struct r1bio *r1_bio;
25551da177e4SLinus Torvalds unsigned long flags;
2556e8096360SNeilBrown struct r1conf *conf = mddev->private;
25571da177e4SLinus Torvalds struct list_head *head = &conf->retry_list;
2558e1dfa0a2SNeilBrown struct blk_plug plug;
2559fd76863eScolyli@suse.de int idx;
25601da177e4SLinus Torvalds
25611da177e4SLinus Torvalds md_check_recovery(mddev);
25621da177e4SLinus Torvalds
256355ce74d4SNeilBrown if (!list_empty_careful(&conf->bio_end_io_list) &&
25642953079cSShaohua Li !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
256555ce74d4SNeilBrown LIST_HEAD(tmp);
256655ce74d4SNeilBrown spin_lock_irqsave(&conf->device_lock, flags);
2567fd76863eScolyli@suse.de if (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
2568fd76863eScolyli@suse.de list_splice_init(&conf->bio_end_io_list, &tmp);
256955ce74d4SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags);
257055ce74d4SNeilBrown while (!list_empty(&tmp)) {
2571a452744bSMikulas Patocka r1_bio = list_first_entry(&tmp, struct r1bio,
2572a452744bSMikulas Patocka retry_list);
257355ce74d4SNeilBrown list_del(&r1_bio->retry_list);
2574fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector);
2575824e47daScolyli@suse.de atomic_dec(&conf->nr_queued[idx]);
2576bd8688a1SNeilBrown if (mddev->degraded)
2577bd8688a1SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state);
2578bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state))
2579bd8688a1SNeilBrown close_write(r1_bio);
258055ce74d4SNeilBrown raid_end_bio_io(r1_bio);
258155ce74d4SNeilBrown }
258255ce74d4SNeilBrown }
258355ce74d4SNeilBrown
2584e1dfa0a2SNeilBrown blk_start_plug(&plug);
25851da177e4SLinus Torvalds for (;;) {
2586a35e63efSNeilBrown
25877eaceaccSJens Axboe flush_pending_writes(conf);
2588a35e63efSNeilBrown
25891da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags);
2590a35e63efSNeilBrown if (list_empty(head)) {
2591191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags);
25921da177e4SLinus Torvalds break;
2593a35e63efSNeilBrown }
25949f2c9d12SNeilBrown r1_bio = list_entry(head->prev, struct r1bio, retry_list);
25951da177e4SLinus Torvalds list_del(head->prev);
2596fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector);
2597824e47daScolyli@suse.de atomic_dec(&conf->nr_queued[idx]);
25981da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags);
25991da177e4SLinus Torvalds
26001da177e4SLinus Torvalds mddev = r1_bio->mddev;
2601070ec55dSNeilBrown conf = mddev->private;
26024367af55SNeilBrown if (test_bit(R1BIO_IsSync, &r1_bio->state)) {
2603d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) ||
260462096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state))
260562096bceSNeilBrown handle_sync_write_finished(conf, r1_bio);
260662096bceSNeilBrown else
26071da177e4SLinus Torvalds sync_request_write(mddev, r1_bio);
2608cd5ff9a1SNeilBrown } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) ||
260962096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state))
261062096bceSNeilBrown handle_write_finished(conf, r1_bio);
261162096bceSNeilBrown else if (test_bit(R1BIO_ReadError, &r1_bio->state))
261262096bceSNeilBrown handle_read_error(conf, r1_bio);
2613d2eb35acSNeilBrown else
2614c230e7e5SNeilBrown WARN_ON_ONCE(1);
261562096bceSNeilBrown
26161d9d5241SNeilBrown cond_resched();
26172953079cSShaohua Li if (mddev->sb_flags & ~(1<<MD_SB_CHANGE_PENDING))
2618de393cdeSNeilBrown md_check_recovery(mddev);
26191da177e4SLinus Torvalds }
2620e1dfa0a2SNeilBrown blk_finish_plug(&plug);
26211da177e4SLinus Torvalds }
26221da177e4SLinus Torvalds
init_resync(struct r1conf * conf)2623e8096360SNeilBrown static int init_resync(struct r1conf *conf)
26241da177e4SLinus Torvalds {
26251da177e4SLinus Torvalds int buffs;
26261da177e4SLinus Torvalds
26271da177e4SLinus Torvalds buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE;
2628afeee514SKent Overstreet BUG_ON(mempool_initialized(&conf->r1buf_pool));
2629afeee514SKent Overstreet
2630afeee514SKent Overstreet return mempool_init(&conf->r1buf_pool, buffs, r1buf_pool_alloc,
2631afeee514SKent Overstreet r1buf_pool_free, conf->poolinfo);
26321da177e4SLinus Torvalds }
26331da177e4SLinus Torvalds
raid1_alloc_init_r1buf(struct r1conf * conf)2634208410b5SShaohua Li static struct r1bio *raid1_alloc_init_r1buf(struct r1conf *conf)
2635208410b5SShaohua Li {
2636afeee514SKent Overstreet struct r1bio *r1bio = mempool_alloc(&conf->r1buf_pool, GFP_NOIO);
2637208410b5SShaohua Li struct resync_pages *rps;
2638208410b5SShaohua Li struct bio *bio;
2639208410b5SShaohua Li int i;
2640208410b5SShaohua Li
2641208410b5SShaohua Li for (i = conf->poolinfo->raid_disks; i--; ) {
2642208410b5SShaohua Li bio = r1bio->bios[i];
2643208410b5SShaohua Li rps = bio->bi_private;
2644a7c50c94SChristoph Hellwig bio_reset(bio, NULL, 0);
2645208410b5SShaohua Li bio->bi_private = rps;
2646208410b5SShaohua Li }
2647208410b5SShaohua Li r1bio->master_bio = NULL;
2648208410b5SShaohua Li return r1bio;
2649208410b5SShaohua Li }
2650208410b5SShaohua Li
26511da177e4SLinus Torvalds /*
26521da177e4SLinus Torvalds * perform a "sync" on one "block"
26531da177e4SLinus Torvalds *
26541da177e4SLinus Torvalds * We need to make sure that no normal I/O request - particularly write
26551da177e4SLinus Torvalds * requests - conflict with active sync requests.
26561da177e4SLinus Torvalds *
26571da177e4SLinus Torvalds * This is achieved by tracking pending requests and a 'barrier' concept
26581da177e4SLinus Torvalds * that can be installed to exclude normal IO requests.
26591da177e4SLinus Torvalds */
26601da177e4SLinus Torvalds
raid1_sync_request(struct mddev * mddev,sector_t sector_nr,int * skipped)2661849674e4SShaohua Li static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr,
2662849674e4SShaohua Li int *skipped)
26631da177e4SLinus Torvalds {
2664e8096360SNeilBrown struct r1conf *conf = mddev->private;
26659f2c9d12SNeilBrown struct r1bio *r1_bio;
26661da177e4SLinus Torvalds struct bio *bio;
26671da177e4SLinus Torvalds sector_t max_sector, nr_sectors;
26683e198f78SNeilBrown int disk = -1;
26691da177e4SLinus Torvalds int i;
26703e198f78SNeilBrown int wonly = -1;
26713e198f78SNeilBrown int write_targets = 0, read_targets = 0;
267257dab0bdSNeilBrown sector_t sync_blocks;
2673e3b9703eSNeilBrown int still_degraded = 0;
267406f60385SNeilBrown int good_sectors = RESYNC_SECTORS;
267506f60385SNeilBrown int min_bad = 0; /* number of sectors that are bad in all devices */
2676fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr);
2677022e510fSMing Lei int page_idx = 0;
26781da177e4SLinus Torvalds
2679afeee514SKent Overstreet if (!mempool_initialized(&conf->r1buf_pool))
26801da177e4SLinus Torvalds if (init_resync(conf))
268157afd89fSNeilBrown return 0;
26821da177e4SLinus Torvalds
268358c0fed4SAndre Noll max_sector = mddev->dev_sectors;
26841da177e4SLinus Torvalds if (sector_nr >= max_sector) {
2685191ea9b2SNeilBrown /* If we aborted, we need to abort the
2686191ea9b2SNeilBrown * sync on the 'current' bitmap chunk (there will
2687191ea9b2SNeilBrown * only be one in raid1 resync.
2688191ea9b2SNeilBrown * We can find the current addess in mddev->curr_resync
2689191ea9b2SNeilBrown */
26906a806c51SNeilBrown if (mddev->curr_resync < max_sector) /* aborted */
2691e64e4018SAndy Shevchenko md_bitmap_end_sync(mddev->bitmap, mddev->curr_resync,
2692191ea9b2SNeilBrown &sync_blocks, 1);
26936a806c51SNeilBrown else /* completed sync */
2694191ea9b2SNeilBrown conf->fullsync = 0;
26956a806c51SNeilBrown
2696e64e4018SAndy Shevchenko md_bitmap_close_sync(mddev->bitmap);
26971da177e4SLinus Torvalds close_sync(conf);
2698c40f341fSGoldwyn Rodrigues
2699c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev)) {
2700c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = 0;
2701c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = 0;
2702c40f341fSGoldwyn Rodrigues }
27031da177e4SLinus Torvalds return 0;
27041da177e4SLinus Torvalds }
27051da177e4SLinus Torvalds
270607d84d10SNeilBrown if (mddev->bitmap == NULL &&
270707d84d10SNeilBrown mddev->recovery_cp == MaxSector &&
27086394cca5SNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
270907d84d10SNeilBrown conf->fullsync == 0) {
271007d84d10SNeilBrown *skipped = 1;
271107d84d10SNeilBrown return max_sector - sector_nr;
271207d84d10SNeilBrown }
27136394cca5SNeilBrown /* before building a request, check if we can skip these blocks..
27146394cca5SNeilBrown * This call the bitmap_start_sync doesn't actually record anything
27156394cca5SNeilBrown */
2716e64e4018SAndy Shevchenko if (!md_bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) &&
2717e5de485fSNeilBrown !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
2718191ea9b2SNeilBrown /* We can skip this block, and probably several more */
2719191ea9b2SNeilBrown *skipped = 1;
2720191ea9b2SNeilBrown return sync_blocks;
2721191ea9b2SNeilBrown }
272217999be4SNeilBrown
27237ac50447STomasz Majchrzak /*
27247ac50447STomasz Majchrzak * If there is non-resync activity waiting for a turn, then let it
27257ac50447STomasz Majchrzak * though before starting on this new sync request.
27267ac50447STomasz Majchrzak */
2727824e47daScolyli@suse.de if (atomic_read(&conf->nr_waiting[idx]))
27287ac50447STomasz Majchrzak schedule_timeout_uninterruptible(1);
27297ac50447STomasz Majchrzak
2730c40f341fSGoldwyn Rodrigues /* we are incrementing sector_nr below. To be safe, we check against
2731c40f341fSGoldwyn Rodrigues * sector_nr + two times RESYNC_SECTORS
2732c40f341fSGoldwyn Rodrigues */
2733c40f341fSGoldwyn Rodrigues
2734e64e4018SAndy Shevchenko md_bitmap_cond_end_sync(mddev->bitmap, sector_nr,
2735c40f341fSGoldwyn Rodrigues mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high));
273617999be4SNeilBrown
27378c242593SYufen Yu
27388c242593SYufen Yu if (raise_barrier(conf, sector_nr))
27398c242593SYufen Yu return 0;
27408c242593SYufen Yu
27418c242593SYufen Yu r1_bio = raid1_alloc_init_r1buf(conf);
27421da177e4SLinus Torvalds
27433e198f78SNeilBrown rcu_read_lock();
27443e198f78SNeilBrown /*
27453e198f78SNeilBrown * If we get a correctably read error during resync or recovery,
27463e198f78SNeilBrown * we might want to read from a different device. So we
27473e198f78SNeilBrown * flag all drives that could conceivably be read from for READ,
27483e198f78SNeilBrown * and any others (which will be non-In_sync devices) for WRITE.
27493e198f78SNeilBrown * If a read fails, we try reading from something else for which READ
27503e198f78SNeilBrown * is OK.
27513e198f78SNeilBrown */
27521da177e4SLinus Torvalds
27531da177e4SLinus Torvalds r1_bio->mddev = mddev;
27541da177e4SLinus Torvalds r1_bio->sector = sector_nr;
2755191ea9b2SNeilBrown r1_bio->state = 0;
27561da177e4SLinus Torvalds set_bit(R1BIO_IsSync, &r1_bio->state);
2757fd76863eScolyli@suse.de /* make sure good_sectors won't go across barrier unit boundary */
2758fd76863eScolyli@suse.de good_sectors = align_to_barrier_unit_end(sector_nr, good_sectors);
27591da177e4SLinus Torvalds
27608f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) {
27613cb03002SNeilBrown struct md_rdev *rdev;
27621da177e4SLinus Torvalds bio = r1_bio->bios[i];
27631da177e4SLinus Torvalds
27643e198f78SNeilBrown rdev = rcu_dereference(conf->mirrors[i].rdev);
27653e198f78SNeilBrown if (rdev == NULL ||
27663e198f78SNeilBrown test_bit(Faulty, &rdev->flags)) {
27678f19ccb2SNeilBrown if (i < conf->raid_disks)
2768e3b9703eSNeilBrown still_degraded = 1;
27693e198f78SNeilBrown } else if (!test_bit(In_sync, &rdev->flags)) {
2770c34b7ac6SChristoph Hellwig bio->bi_opf = REQ_OP_WRITE;
27711da177e4SLinus Torvalds bio->bi_end_io = end_sync_write;
27721da177e4SLinus Torvalds write_targets ++;
27733e198f78SNeilBrown } else {
27743e198f78SNeilBrown /* may need to read from here */
277506f60385SNeilBrown sector_t first_bad = MaxSector;
277606f60385SNeilBrown int bad_sectors;
277706f60385SNeilBrown
277806f60385SNeilBrown if (is_badblock(rdev, sector_nr, good_sectors,
277906f60385SNeilBrown &first_bad, &bad_sectors)) {
278006f60385SNeilBrown if (first_bad > sector_nr)
278106f60385SNeilBrown good_sectors = first_bad - sector_nr;
278206f60385SNeilBrown else {
278306f60385SNeilBrown bad_sectors -= (sector_nr - first_bad);
278406f60385SNeilBrown if (min_bad == 0 ||
278506f60385SNeilBrown min_bad > bad_sectors)
278606f60385SNeilBrown min_bad = bad_sectors;
278706f60385SNeilBrown }
278806f60385SNeilBrown }
278906f60385SNeilBrown if (sector_nr < first_bad) {
27903e198f78SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) {
27913e198f78SNeilBrown if (wonly < 0)
27923e198f78SNeilBrown wonly = i;
27933e198f78SNeilBrown } else {
27943e198f78SNeilBrown if (disk < 0)
27953e198f78SNeilBrown disk = i;
27963e198f78SNeilBrown }
2797c34b7ac6SChristoph Hellwig bio->bi_opf = REQ_OP_READ;
279806f60385SNeilBrown bio->bi_end_io = end_sync_read;
27993e198f78SNeilBrown read_targets++;
2800d57368afSAlexander Lyakas } else if (!test_bit(WriteErrorSeen, &rdev->flags) &&
2801d57368afSAlexander Lyakas test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
2802d57368afSAlexander Lyakas !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
2803d57368afSAlexander Lyakas /*
2804d57368afSAlexander Lyakas * The device is suitable for reading (InSync),
2805d57368afSAlexander Lyakas * but has bad block(s) here. Let's try to correct them,
2806d57368afSAlexander Lyakas * if we are doing resync or repair. Otherwise, leave
2807d57368afSAlexander Lyakas * this device alone for this sync request.
2808d57368afSAlexander Lyakas */
2809c34b7ac6SChristoph Hellwig bio->bi_opf = REQ_OP_WRITE;
2810d57368afSAlexander Lyakas bio->bi_end_io = end_sync_write;
2811d57368afSAlexander Lyakas write_targets++;
28123e198f78SNeilBrown }
281306f60385SNeilBrown }
2814028288dfSZhiqiang Liu if (rdev && bio->bi_end_io) {
28153e198f78SNeilBrown atomic_inc(&rdev->nr_pending);
28164f024f37SKent Overstreet bio->bi_iter.bi_sector = sector_nr + rdev->data_offset;
281774d46992SChristoph Hellwig bio_set_dev(bio, rdev->bdev);
28182e52d449SNeilBrown if (test_bit(FailFast, &rdev->flags))
28192e52d449SNeilBrown bio->bi_opf |= MD_FAILFAST;
28201da177e4SLinus Torvalds }
282106f60385SNeilBrown }
28223e198f78SNeilBrown rcu_read_unlock();
28233e198f78SNeilBrown if (disk < 0)
28243e198f78SNeilBrown disk = wonly;
28253e198f78SNeilBrown r1_bio->read_disk = disk;
2826191ea9b2SNeilBrown
282706f60385SNeilBrown if (read_targets == 0 && min_bad > 0) {
282806f60385SNeilBrown /* These sectors are bad on all InSync devices, so we
282906f60385SNeilBrown * need to mark them bad on all write targets
283006f60385SNeilBrown */
283106f60385SNeilBrown int ok = 1;
28328f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2 ; i++)
283306f60385SNeilBrown if (r1_bio->bios[i]->bi_end_io == end_sync_write) {
2834a42f9d83Smajianpeng struct md_rdev *rdev = conf->mirrors[i].rdev;
283506f60385SNeilBrown ok = rdev_set_badblocks(rdev, sector_nr,
283606f60385SNeilBrown min_bad, 0
283706f60385SNeilBrown ) && ok;
283806f60385SNeilBrown }
28392953079cSShaohua Li set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
284006f60385SNeilBrown *skipped = 1;
284106f60385SNeilBrown put_buf(r1_bio);
284206f60385SNeilBrown
284306f60385SNeilBrown if (!ok) {
284406f60385SNeilBrown /* Cannot record the badblocks, so need to
284506f60385SNeilBrown * abort the resync.
284606f60385SNeilBrown * If there are multiple read targets, could just
284706f60385SNeilBrown * fail the really bad ones ???
284806f60385SNeilBrown */
284906f60385SNeilBrown conf->recovery_disabled = mddev->recovery_disabled;
285006f60385SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery);
285106f60385SNeilBrown return 0;
285206f60385SNeilBrown } else
285306f60385SNeilBrown return min_bad;
285406f60385SNeilBrown
285506f60385SNeilBrown }
285606f60385SNeilBrown if (min_bad > 0 && min_bad < good_sectors) {
285706f60385SNeilBrown /* only resync enough to reach the next bad->good
285806f60385SNeilBrown * transition */
285906f60385SNeilBrown good_sectors = min_bad;
286006f60385SNeilBrown }
286106f60385SNeilBrown
28623e198f78SNeilBrown if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0)
28633e198f78SNeilBrown /* extra read targets are also write targets */
28643e198f78SNeilBrown write_targets += read_targets-1;
28653e198f78SNeilBrown
28663e198f78SNeilBrown if (write_targets == 0 || read_targets == 0) {
28671da177e4SLinus Torvalds /* There is nowhere to write, so all non-sync
28681da177e4SLinus Torvalds * drives must be failed - so we are finished
28691da177e4SLinus Torvalds */
2870b7219ccbSNeilBrown sector_t rv;
2871b7219ccbSNeilBrown if (min_bad > 0)
2872b7219ccbSNeilBrown max_sector = sector_nr + min_bad;
2873b7219ccbSNeilBrown rv = max_sector - sector_nr;
287457afd89fSNeilBrown *skipped = 1;
28751da177e4SLinus Torvalds put_buf(r1_bio);
28761da177e4SLinus Torvalds return rv;
28771da177e4SLinus Torvalds }
28781da177e4SLinus Torvalds
2879c6207277SNeilBrown if (max_sector > mddev->resync_max)
2880c6207277SNeilBrown max_sector = mddev->resync_max; /* Don't do IO beyond here */
288106f60385SNeilBrown if (max_sector > sector_nr + good_sectors)
288206f60385SNeilBrown max_sector = sector_nr + good_sectors;
28831da177e4SLinus Torvalds nr_sectors = 0;
2884289e99e8SNeilBrown sync_blocks = 0;
28851da177e4SLinus Torvalds do {
28861da177e4SLinus Torvalds struct page *page;
28871da177e4SLinus Torvalds int len = PAGE_SIZE;
28881da177e4SLinus Torvalds if (sector_nr + (len>>9) > max_sector)
28891da177e4SLinus Torvalds len = (max_sector - sector_nr) << 9;
28901da177e4SLinus Torvalds if (len == 0)
28911da177e4SLinus Torvalds break;
2892ab7a30c7SNeilBrown if (sync_blocks == 0) {
2893e64e4018SAndy Shevchenko if (!md_bitmap_start_sync(mddev->bitmap, sector_nr,
2894e3b9703eSNeilBrown &sync_blocks, still_degraded) &&
2895e5de485fSNeilBrown !conf->fullsync &&
2896e5de485fSNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2897191ea9b2SNeilBrown break;
28987571ae88SNeilBrown if ((len >> 9) > sync_blocks)
28996a806c51SNeilBrown len = sync_blocks<<9;
2900ab7a30c7SNeilBrown }
2901191ea9b2SNeilBrown
29028f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2; i++) {
290398d30c58SMing Lei struct resync_pages *rp;
290498d30c58SMing Lei
29051da177e4SLinus Torvalds bio = r1_bio->bios[i];
290698d30c58SMing Lei rp = get_resync_pages(bio);
29071da177e4SLinus Torvalds if (bio->bi_end_io) {
2908022e510fSMing Lei page = resync_fetch_page(rp, page_idx);
2909c85ba149SMing Lei
2910c85ba149SMing Lei /*
2911c85ba149SMing Lei * won't fail because the vec table is big
2912c85ba149SMing Lei * enough to hold all these pages
2913c85ba149SMing Lei */
2914f8312322SJohannes Thumshirn __bio_add_page(bio, page, len, 0);
29151da177e4SLinus Torvalds }
29161da177e4SLinus Torvalds }
29171da177e4SLinus Torvalds nr_sectors += len>>9;
29181da177e4SLinus Torvalds sector_nr += len>>9;
2919191ea9b2SNeilBrown sync_blocks -= (len>>9);
2920022e510fSMing Lei } while (++page_idx < RESYNC_PAGES);
292198d30c58SMing Lei
29221da177e4SLinus Torvalds r1_bio->sectors = nr_sectors;
29231da177e4SLinus Torvalds
2924c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev) &&
2925c40f341fSGoldwyn Rodrigues conf->cluster_sync_high < sector_nr + nr_sectors) {
2926c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = mddev->curr_resync_completed;
2927c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = conf->cluster_sync_low + CLUSTER_RESYNC_WINDOW_SECTORS;
2928c40f341fSGoldwyn Rodrigues /* Send resync message */
2929c40f341fSGoldwyn Rodrigues md_cluster_ops->resync_info_update(mddev,
2930c40f341fSGoldwyn Rodrigues conf->cluster_sync_low,
2931c40f341fSGoldwyn Rodrigues conf->cluster_sync_high);
2932c40f341fSGoldwyn Rodrigues }
2933c40f341fSGoldwyn Rodrigues
2934d11c171eSNeilBrown /* For a user-requested sync, we read all readable devices and do a
2935d11c171eSNeilBrown * compare
2936d11c171eSNeilBrown */
2937d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
2938d11c171eSNeilBrown atomic_set(&r1_bio->remaining, read_targets);
29392d4f4f33SNeilBrown for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) {
2940d11c171eSNeilBrown bio = r1_bio->bios[i];
2941d11c171eSNeilBrown if (bio->bi_end_io == end_sync_read) {
29422d4f4f33SNeilBrown read_targets--;
294374d46992SChristoph Hellwig md_sync_acct_bio(bio, nr_sectors);
29442e52d449SNeilBrown if (read_targets == 1)
29452e52d449SNeilBrown bio->bi_opf &= ~MD_FAILFAST;
2946ed00aabdSChristoph Hellwig submit_bio_noacct(bio);
2947d11c171eSNeilBrown }
2948d11c171eSNeilBrown }
2949d11c171eSNeilBrown } else {
2950d11c171eSNeilBrown atomic_set(&r1_bio->remaining, 1);
2951d11c171eSNeilBrown bio = r1_bio->bios[r1_bio->read_disk];
295274d46992SChristoph Hellwig md_sync_acct_bio(bio, nr_sectors);
29532e52d449SNeilBrown if (read_targets == 1)
29542e52d449SNeilBrown bio->bi_opf &= ~MD_FAILFAST;
2955ed00aabdSChristoph Hellwig submit_bio_noacct(bio);
2956d11c171eSNeilBrown }
29571da177e4SLinus Torvalds return nr_sectors;
29581da177e4SLinus Torvalds }
29591da177e4SLinus Torvalds
raid1_size(struct mddev * mddev,sector_t sectors,int raid_disks)2960fd01b88cSNeilBrown static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks)
296180c3a6ceSDan Williams {
296280c3a6ceSDan Williams if (sectors)
296380c3a6ceSDan Williams return sectors;
296480c3a6ceSDan Williams
296580c3a6ceSDan Williams return mddev->dev_sectors;
296680c3a6ceSDan Williams }
296780c3a6ceSDan Williams
setup_conf(struct mddev * mddev)2968e8096360SNeilBrown static struct r1conf *setup_conf(struct mddev *mddev)
29691da177e4SLinus Torvalds {
2970e8096360SNeilBrown struct r1conf *conf;
2971709ae487SNeilBrown int i;
29720eaf822cSJonathan Brassow struct raid1_info *disk;
29733cb03002SNeilBrown struct md_rdev *rdev;
2974709ae487SNeilBrown int err = -ENOMEM;
29751da177e4SLinus Torvalds
2976e8096360SNeilBrown conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL);
29771da177e4SLinus Torvalds if (!conf)
2978709ae487SNeilBrown goto abort;
29791da177e4SLinus Torvalds
2980fd76863eScolyli@suse.de conf->nr_pending = kcalloc(BARRIER_BUCKETS_NR,
2981824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL);
2982fd76863eScolyli@suse.de if (!conf->nr_pending)
2983fd76863eScolyli@suse.de goto abort;
2984fd76863eScolyli@suse.de
2985fd76863eScolyli@suse.de conf->nr_waiting = kcalloc(BARRIER_BUCKETS_NR,
2986824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL);
2987fd76863eScolyli@suse.de if (!conf->nr_waiting)
2988fd76863eScolyli@suse.de goto abort;
2989fd76863eScolyli@suse.de
2990fd76863eScolyli@suse.de conf->nr_queued = kcalloc(BARRIER_BUCKETS_NR,
2991824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL);
2992fd76863eScolyli@suse.de if (!conf->nr_queued)
2993fd76863eScolyli@suse.de goto abort;
2994fd76863eScolyli@suse.de
2995fd76863eScolyli@suse.de conf->barrier = kcalloc(BARRIER_BUCKETS_NR,
2996824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL);
2997fd76863eScolyli@suse.de if (!conf->barrier)
2998fd76863eScolyli@suse.de goto abort;
2999fd76863eScolyli@suse.de
30006396bb22SKees Cook conf->mirrors = kzalloc(array3_size(sizeof(struct raid1_info),
30016396bb22SKees Cook mddev->raid_disks, 2),
30021da177e4SLinus Torvalds GFP_KERNEL);
30031da177e4SLinus Torvalds if (!conf->mirrors)
3004709ae487SNeilBrown goto abort;
30051da177e4SLinus Torvalds
3006ddaf22abSNeilBrown conf->tmppage = alloc_page(GFP_KERNEL);
3007ddaf22abSNeilBrown if (!conf->tmppage)
3008709ae487SNeilBrown goto abort;
3009ddaf22abSNeilBrown
3010709ae487SNeilBrown conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL);
30111da177e4SLinus Torvalds if (!conf->poolinfo)
3012709ae487SNeilBrown goto abort;
30138f19ccb2SNeilBrown conf->poolinfo->raid_disks = mddev->raid_disks * 2;
30143f677f9cSMarcos Paulo de Souza err = mempool_init(&conf->r1bio_pool, NR_RAID_BIOS, r1bio_pool_alloc,
3015c7afa803SMarcos Paulo de Souza rbio_pool_free, conf->poolinfo);
3016afeee514SKent Overstreet if (err)
3017709ae487SNeilBrown goto abort;
3018709ae487SNeilBrown
3019afeee514SKent Overstreet err = bioset_init(&conf->bio_split, BIO_POOL_SIZE, 0, 0);
3020afeee514SKent Overstreet if (err)
3021c230e7e5SNeilBrown goto abort;
3022c230e7e5SNeilBrown
3023ed9bfdf1SNeilBrown conf->poolinfo->mddev = mddev;
30241da177e4SLinus Torvalds
3025c19d5798SNeilBrown err = -EINVAL;
3026e7e72bf6SNeil Brown spin_lock_init(&conf->device_lock);
3027dafb20faSNeilBrown rdev_for_each(rdev, mddev) {
3028709ae487SNeilBrown int disk_idx = rdev->raid_disk;
30291da177e4SLinus Torvalds if (disk_idx >= mddev->raid_disks
30301da177e4SLinus Torvalds || disk_idx < 0)
30311da177e4SLinus Torvalds continue;
3032c19d5798SNeilBrown if (test_bit(Replacement, &rdev->flags))
303302b898f2SNeilBrown disk = conf->mirrors + mddev->raid_disks + disk_idx;
3034c19d5798SNeilBrown else
30351da177e4SLinus Torvalds disk = conf->mirrors + disk_idx;
30361da177e4SLinus Torvalds
3037c19d5798SNeilBrown if (disk->rdev)
3038c19d5798SNeilBrown goto abort;
30391da177e4SLinus Torvalds disk->rdev = rdev;
30401da177e4SLinus Torvalds disk->head_position = 0;
304112cee5a8SShaohua Li disk->seq_start = MaxSector;
30421da177e4SLinus Torvalds }
30431da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks;
30441da177e4SLinus Torvalds conf->mddev = mddev;
30451da177e4SLinus Torvalds INIT_LIST_HEAD(&conf->retry_list);
304655ce74d4SNeilBrown INIT_LIST_HEAD(&conf->bio_end_io_list);
30471da177e4SLinus Torvalds
30481da177e4SLinus Torvalds spin_lock_init(&conf->resync_lock);
304917999be4SNeilBrown init_waitqueue_head(&conf->wait_barrier);
30501da177e4SLinus Torvalds
3051191ea9b2SNeilBrown bio_list_init(&conf->pending_bio_list);
3052d890fa2bSNeilBrown conf->recovery_disabled = mddev->recovery_disabled - 1;
3053191ea9b2SNeilBrown
3054c19d5798SNeilBrown err = -EIO;
30558f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) {
30561da177e4SLinus Torvalds
30571da177e4SLinus Torvalds disk = conf->mirrors + i;
30581da177e4SLinus Torvalds
3059c19d5798SNeilBrown if (i < conf->raid_disks &&
3060c19d5798SNeilBrown disk[conf->raid_disks].rdev) {
3061c19d5798SNeilBrown /* This slot has a replacement. */
3062c19d5798SNeilBrown if (!disk->rdev) {
3063c19d5798SNeilBrown /* No original, just make the replacement
3064c19d5798SNeilBrown * a recovering spare
3065c19d5798SNeilBrown */
3066c19d5798SNeilBrown disk->rdev =
3067c19d5798SNeilBrown disk[conf->raid_disks].rdev;
3068c19d5798SNeilBrown disk[conf->raid_disks].rdev = NULL;
3069c19d5798SNeilBrown } else if (!test_bit(In_sync, &disk->rdev->flags))
3070c19d5798SNeilBrown /* Original is not in_sync - bad */
3071c19d5798SNeilBrown goto abort;
3072c19d5798SNeilBrown }
3073c19d5798SNeilBrown
30745fd6c1dcSNeilBrown if (!disk->rdev ||
30755fd6c1dcSNeilBrown !test_bit(In_sync, &disk->rdev->flags)) {
30761da177e4SLinus Torvalds disk->head_position = 0;
30774f0a5e01SJonathan Brassow if (disk->rdev &&
30784f0a5e01SJonathan Brassow (disk->rdev->saved_raid_disk < 0))
307917571284SNeilBrown conf->fullsync = 1;
3080be4d3280SShaohua Li }
30811da177e4SLinus Torvalds }
3082709ae487SNeilBrown
3083709ae487SNeilBrown err = -ENOMEM;
308444693154SYu Kuai rcu_assign_pointer(conf->thread,
308544693154SYu Kuai md_register_thread(raid1d, mddev, "raid1"));
30861d41c216SNeilBrown if (!conf->thread)
3087709ae487SNeilBrown goto abort;
3088191ea9b2SNeilBrown
3089709ae487SNeilBrown return conf;
3090709ae487SNeilBrown
3091709ae487SNeilBrown abort:
3092709ae487SNeilBrown if (conf) {
3093afeee514SKent Overstreet mempool_exit(&conf->r1bio_pool);
3094709ae487SNeilBrown kfree(conf->mirrors);
3095709ae487SNeilBrown safe_put_page(conf->tmppage);
3096709ae487SNeilBrown kfree(conf->poolinfo);
3097fd76863eScolyli@suse.de kfree(conf->nr_pending);
3098fd76863eScolyli@suse.de kfree(conf->nr_waiting);
3099fd76863eScolyli@suse.de kfree(conf->nr_queued);
3100fd76863eScolyli@suse.de kfree(conf->barrier);
3101afeee514SKent Overstreet bioset_exit(&conf->bio_split);
3102709ae487SNeilBrown kfree(conf);
3103709ae487SNeilBrown }
3104709ae487SNeilBrown return ERR_PTR(err);
3105709ae487SNeilBrown }
3106709ae487SNeilBrown
3107afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv);
raid1_run(struct mddev * mddev)3108849674e4SShaohua Li static int raid1_run(struct mddev *mddev)
3109709ae487SNeilBrown {
3110e8096360SNeilBrown struct r1conf *conf;
3111709ae487SNeilBrown int i;
31123cb03002SNeilBrown struct md_rdev *rdev;
31135220ea1eSmajianpeng int ret;
3114709ae487SNeilBrown
3115709ae487SNeilBrown if (mddev->level != 1) {
31161d41c216SNeilBrown pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n",
3117709ae487SNeilBrown mdname(mddev), mddev->level);
3118709ae487SNeilBrown return -EIO;
3119709ae487SNeilBrown }
3120709ae487SNeilBrown if (mddev->reshape_position != MaxSector) {
31211d41c216SNeilBrown pr_warn("md/raid1:%s: reshape_position set but not supported\n",
3122709ae487SNeilBrown mdname(mddev));
3123709ae487SNeilBrown return -EIO;
3124709ae487SNeilBrown }
3125a415c0f1SNeilBrown if (mddev_init_writes_pending(mddev) < 0)
3126a415c0f1SNeilBrown return -ENOMEM;
3127709ae487SNeilBrown /*
3128709ae487SNeilBrown * copy the already verified devices into our private RAID1
3129709ae487SNeilBrown * bookkeeping area. [whatever we allocate in run(),
3130afa0f557SNeilBrown * should be freed in raid1_free()]
3131709ae487SNeilBrown */
3132709ae487SNeilBrown if (mddev->private == NULL)
3133709ae487SNeilBrown conf = setup_conf(mddev);
3134709ae487SNeilBrown else
3135709ae487SNeilBrown conf = mddev->private;
3136709ae487SNeilBrown
3137709ae487SNeilBrown if (IS_ERR(conf))
3138709ae487SNeilBrown return PTR_ERR(conf);
3139709ae487SNeilBrown
314010fa225cSChristoph Hellwig if (mddev->queue)
31413deff1a7SChristoph Hellwig blk_queue_max_write_zeroes_sectors(mddev->queue, 0);
31425026d7a9SH. Peter Anvin
3143dafb20faSNeilBrown rdev_for_each(rdev, mddev) {
31441ed7242eSJonathan Brassow if (!mddev->gendisk)
31451ed7242eSJonathan Brassow continue;
3146709ae487SNeilBrown disk_stack_limits(mddev->gendisk, rdev->bdev,
3147709ae487SNeilBrown rdev->data_offset << 9);
3148709ae487SNeilBrown }
3149709ae487SNeilBrown
3150709ae487SNeilBrown mddev->degraded = 0;
3151709ae487SNeilBrown for (i = 0; i < conf->raid_disks; i++)
3152709ae487SNeilBrown if (conf->mirrors[i].rdev == NULL ||
3153709ae487SNeilBrown !test_bit(In_sync, &conf->mirrors[i].rdev->flags) ||
3154709ae487SNeilBrown test_bit(Faulty, &conf->mirrors[i].rdev->flags))
3155709ae487SNeilBrown mddev->degraded++;
315607f1a685SYufen Yu /*
315707f1a685SYufen Yu * RAID1 needs at least one disk in active
315807f1a685SYufen Yu */
315907f1a685SYufen Yu if (conf->raid_disks - mddev->degraded < 1) {
31607eb8ff02SLi Lingfeng md_unregister_thread(mddev, &conf->thread);
316107f1a685SYufen Yu ret = -EINVAL;
316207f1a685SYufen Yu goto abort;
316307f1a685SYufen Yu }
3164709ae487SNeilBrown
3165709ae487SNeilBrown if (conf->raid_disks - mddev->degraded == 1)
3166709ae487SNeilBrown mddev->recovery_cp = MaxSector;
3167709ae487SNeilBrown
31688c6ac868SAndre Noll if (mddev->recovery_cp != MaxSector)
31691d41c216SNeilBrown pr_info("md/raid1:%s: not clean -- starting background reconstruction\n",
31708c6ac868SAndre Noll mdname(mddev));
31711d41c216SNeilBrown pr_info("md/raid1:%s: active with %d out of %d mirrors\n",
31721da177e4SLinus Torvalds mdname(mddev), mddev->raid_disks - mddev->degraded,
31731da177e4SLinus Torvalds mddev->raid_disks);
3174709ae487SNeilBrown
31751da177e4SLinus Torvalds /*
31761da177e4SLinus Torvalds * Ok, everything is just fine now
31771da177e4SLinus Torvalds */
317844693154SYu Kuai rcu_assign_pointer(mddev->thread, conf->thread);
317944693154SYu Kuai rcu_assign_pointer(conf->thread, NULL);
3180709ae487SNeilBrown mddev->private = conf;
318146533ff7SNeilBrown set_bit(MD_FAILFAST_SUPPORTED, &mddev->flags);
3182709ae487SNeilBrown
31831f403624SDan Williams md_set_array_sectors(mddev, raid1_size(mddev, 0, 0));
31841da177e4SLinus Torvalds
31855220ea1eSmajianpeng ret = md_integrity_register(mddev);
31865aa61f42SNeilBrown if (ret) {
31877eb8ff02SLi Lingfeng md_unregister_thread(mddev, &mddev->thread);
318807f1a685SYufen Yu goto abort;
31895aa61f42SNeilBrown }
319007f1a685SYufen Yu return 0;
319107f1a685SYufen Yu
319207f1a685SYufen Yu abort:
319307f1a685SYufen Yu raid1_free(mddev, conf);
31945220ea1eSmajianpeng return ret;
31951da177e4SLinus Torvalds }
31961da177e4SLinus Torvalds
raid1_free(struct mddev * mddev,void * priv)3197afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv)
31981da177e4SLinus Torvalds {
3199afa0f557SNeilBrown struct r1conf *conf = priv;
32004b6d287fSNeilBrown
3201afeee514SKent Overstreet mempool_exit(&conf->r1bio_pool);
32021da177e4SLinus Torvalds kfree(conf->mirrors);
32030fea7ed8SHirokazu Takahashi safe_put_page(conf->tmppage);
32041da177e4SLinus Torvalds kfree(conf->poolinfo);
3205fd76863eScolyli@suse.de kfree(conf->nr_pending);
3206fd76863eScolyli@suse.de kfree(conf->nr_waiting);
3207fd76863eScolyli@suse.de kfree(conf->nr_queued);
3208fd76863eScolyli@suse.de kfree(conf->barrier);
3209afeee514SKent Overstreet bioset_exit(&conf->bio_split);
32101da177e4SLinus Torvalds kfree(conf);
32111da177e4SLinus Torvalds }
32121da177e4SLinus Torvalds
raid1_resize(struct mddev * mddev,sector_t sectors)3213fd01b88cSNeilBrown static int raid1_resize(struct mddev *mddev, sector_t sectors)
32141da177e4SLinus Torvalds {
32151da177e4SLinus Torvalds /* no resync is happening, and there is enough space
32161da177e4SLinus Torvalds * on all devices, so we can resize.
32171da177e4SLinus Torvalds * We need to make sure resync covers any new space.
32181da177e4SLinus Torvalds * If the array is shrinking we should possibly wait until
32191da177e4SLinus Torvalds * any io in the removed space completes, but it hardly seems
32201da177e4SLinus Torvalds * worth it.
32211da177e4SLinus Torvalds */
3222a4a6125aSNeilBrown sector_t newsize = raid1_size(mddev, sectors, 0);
3223a4a6125aSNeilBrown if (mddev->external_size &&
3224a4a6125aSNeilBrown mddev->array_sectors > newsize)
3225b522adcdSDan Williams return -EINVAL;
3226a4a6125aSNeilBrown if (mddev->bitmap) {
3227e64e4018SAndy Shevchenko int ret = md_bitmap_resize(mddev->bitmap, newsize, 0, 0);
3228a4a6125aSNeilBrown if (ret)
3229a4a6125aSNeilBrown return ret;
3230a4a6125aSNeilBrown }
3231a4a6125aSNeilBrown md_set_array_sectors(mddev, newsize);
3232b522adcdSDan Williams if (sectors > mddev->dev_sectors &&
3233b098636cSNeilBrown mddev->recovery_cp > mddev->dev_sectors) {
323458c0fed4SAndre Noll mddev->recovery_cp = mddev->dev_sectors;
32351da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
32361da177e4SLinus Torvalds }
3237b522adcdSDan Williams mddev->dev_sectors = sectors;
32384b5c7ae8SNeilBrown mddev->resync_max_sectors = sectors;
32391da177e4SLinus Torvalds return 0;
32401da177e4SLinus Torvalds }
32411da177e4SLinus Torvalds
raid1_reshape(struct mddev * mddev)3242fd01b88cSNeilBrown static int raid1_reshape(struct mddev *mddev)
32431da177e4SLinus Torvalds {
32441da177e4SLinus Torvalds /* We need to:
32451da177e4SLinus Torvalds * 1/ resize the r1bio_pool
32461da177e4SLinus Torvalds * 2/ resize conf->mirrors
32471da177e4SLinus Torvalds *
32481da177e4SLinus Torvalds * We allocate a new r1bio_pool if we can.
32491da177e4SLinus Torvalds * Then raise a device barrier and wait until all IO stops.
32501da177e4SLinus Torvalds * Then resize conf->mirrors and swap in the new r1bio pool.
32516ea9c07cSNeilBrown *
32526ea9c07cSNeilBrown * At the same time, we "pack" the devices so that all the missing
32536ea9c07cSNeilBrown * devices have the higher raid_disk numbers.
32541da177e4SLinus Torvalds */
3255afeee514SKent Overstreet mempool_t newpool, oldpool;
32561da177e4SLinus Torvalds struct pool_info *newpoolinfo;
32570eaf822cSJonathan Brassow struct raid1_info *newmirrors;
3258e8096360SNeilBrown struct r1conf *conf = mddev->private;
325963c70c4fSNeilBrown int cnt, raid_disks;
3260c04be0aaSNeilBrown unsigned long flags;
32612214c260SArtur Paszkiewicz int d, d2;
3262afeee514SKent Overstreet int ret;
3263afeee514SKent Overstreet
3264afeee514SKent Overstreet memset(&newpool, 0, sizeof(newpool));
3265afeee514SKent Overstreet memset(&oldpool, 0, sizeof(oldpool));
32661da177e4SLinus Torvalds
326763c70c4fSNeilBrown /* Cannot change chunk_size, layout, or level */
3268664e7c41SAndre Noll if (mddev->chunk_sectors != mddev->new_chunk_sectors ||
326963c70c4fSNeilBrown mddev->layout != mddev->new_layout ||
327063c70c4fSNeilBrown mddev->level != mddev->new_level) {
3271664e7c41SAndre Noll mddev->new_chunk_sectors = mddev->chunk_sectors;
327263c70c4fSNeilBrown mddev->new_layout = mddev->layout;
327363c70c4fSNeilBrown mddev->new_level = mddev->level;
327463c70c4fSNeilBrown return -EINVAL;
327563c70c4fSNeilBrown }
327663c70c4fSNeilBrown
32772214c260SArtur Paszkiewicz if (!mddev_is_clustered(mddev))
32782214c260SArtur Paszkiewicz md_allow_write(mddev);
32792a2275d6SNeilBrown
328063c70c4fSNeilBrown raid_disks = mddev->raid_disks + mddev->delta_disks;
328163c70c4fSNeilBrown
32826ea9c07cSNeilBrown if (raid_disks < conf->raid_disks) {
32836ea9c07cSNeilBrown cnt=0;
32846ea9c07cSNeilBrown for (d= 0; d < conf->raid_disks; d++)
32851da177e4SLinus Torvalds if (conf->mirrors[d].rdev)
32866ea9c07cSNeilBrown cnt++;
32876ea9c07cSNeilBrown if (cnt > raid_disks)
32881da177e4SLinus Torvalds return -EBUSY;
32896ea9c07cSNeilBrown }
32901da177e4SLinus Torvalds
32911da177e4SLinus Torvalds newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL);
32921da177e4SLinus Torvalds if (!newpoolinfo)
32931da177e4SLinus Torvalds return -ENOMEM;
32941da177e4SLinus Torvalds newpoolinfo->mddev = mddev;
32958f19ccb2SNeilBrown newpoolinfo->raid_disks = raid_disks * 2;
32961da177e4SLinus Torvalds
32973f677f9cSMarcos Paulo de Souza ret = mempool_init(&newpool, NR_RAID_BIOS, r1bio_pool_alloc,
3298c7afa803SMarcos Paulo de Souza rbio_pool_free, newpoolinfo);
3299afeee514SKent Overstreet if (ret) {
33001da177e4SLinus Torvalds kfree(newpoolinfo);
3301afeee514SKent Overstreet return ret;
33021da177e4SLinus Torvalds }
33036396bb22SKees Cook newmirrors = kzalloc(array3_size(sizeof(struct raid1_info),
33046396bb22SKees Cook raid_disks, 2),
33058f19ccb2SNeilBrown GFP_KERNEL);
33061da177e4SLinus Torvalds if (!newmirrors) {
33071da177e4SLinus Torvalds kfree(newpoolinfo);
3308afeee514SKent Overstreet mempool_exit(&newpool);
33091da177e4SLinus Torvalds return -ENOMEM;
33101da177e4SLinus Torvalds }
33111da177e4SLinus Torvalds
3312e2d59925SNeilBrown freeze_array(conf, 0);
33131da177e4SLinus Torvalds
33141da177e4SLinus Torvalds /* ok, everything is stopped */
33151da177e4SLinus Torvalds oldpool = conf->r1bio_pool;
33161da177e4SLinus Torvalds conf->r1bio_pool = newpool;
33176ea9c07cSNeilBrown
3318a88aa786SNeilBrown for (d = d2 = 0; d < conf->raid_disks; d++) {
33193cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[d].rdev;
3320a88aa786SNeilBrown if (rdev && rdev->raid_disk != d2) {
332136fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev);
3322a88aa786SNeilBrown rdev->raid_disk = d2;
332336fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev);
332436fad858SNamhyung Kim if (sysfs_link_rdev(mddev, rdev))
33251d41c216SNeilBrown pr_warn("md/raid1:%s: cannot register rd%d\n",
332636fad858SNamhyung Kim mdname(mddev), rdev->raid_disk);
3327a88aa786SNeilBrown }
3328a88aa786SNeilBrown if (rdev)
3329a88aa786SNeilBrown newmirrors[d2++].rdev = rdev;
33306ea9c07cSNeilBrown }
33311da177e4SLinus Torvalds kfree(conf->mirrors);
33321da177e4SLinus Torvalds conf->mirrors = newmirrors;
33331da177e4SLinus Torvalds kfree(conf->poolinfo);
33341da177e4SLinus Torvalds conf->poolinfo = newpoolinfo;
33351da177e4SLinus Torvalds
3336c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags);
33371da177e4SLinus Torvalds mddev->degraded += (raid_disks - conf->raid_disks);
3338c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags);
33391da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks = raid_disks;
334063c70c4fSNeilBrown mddev->delta_disks = 0;
33411da177e4SLinus Torvalds
3342e2d59925SNeilBrown unfreeze_array(conf);
33431da177e4SLinus Torvalds
3344985ca973SNeilBrown set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
33451da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
33461da177e4SLinus Torvalds md_wakeup_thread(mddev->thread);
33471da177e4SLinus Torvalds
3348afeee514SKent Overstreet mempool_exit(&oldpool);
33491da177e4SLinus Torvalds return 0;
33501da177e4SLinus Torvalds }
33511da177e4SLinus Torvalds
raid1_quiesce(struct mddev * mddev,int quiesce)3352b03e0ccbSNeilBrown static void raid1_quiesce(struct mddev *mddev, int quiesce)
335336fa3063SNeilBrown {
3354e8096360SNeilBrown struct r1conf *conf = mddev->private;
335536fa3063SNeilBrown
3356b03e0ccbSNeilBrown if (quiesce)
335707169fd4Smajianpeng freeze_array(conf, 0);
3358b03e0ccbSNeilBrown else
335907169fd4Smajianpeng unfreeze_array(conf);
336036fa3063SNeilBrown }
336136fa3063SNeilBrown
raid1_takeover(struct mddev * mddev)3362fd01b88cSNeilBrown static void *raid1_takeover(struct mddev *mddev)
3363709ae487SNeilBrown {
3364709ae487SNeilBrown /* raid1 can take over:
3365709ae487SNeilBrown * raid5 with 2 devices, any layout or chunk size
3366709ae487SNeilBrown */
3367709ae487SNeilBrown if (mddev->level == 5 && mddev->raid_disks == 2) {
3368e8096360SNeilBrown struct r1conf *conf;
3369709ae487SNeilBrown mddev->new_level = 1;
3370709ae487SNeilBrown mddev->new_layout = 0;
3371709ae487SNeilBrown mddev->new_chunk_sectors = 0;
3372709ae487SNeilBrown conf = setup_conf(mddev);
33736995f0b2SShaohua Li if (!IS_ERR(conf)) {
337407169fd4Smajianpeng /* Array must appear to be quiesced */
337507169fd4Smajianpeng conf->array_frozen = 1;
3376394ed8e4SShaohua Li mddev_clear_unsupported_flags(mddev,
3377394ed8e4SShaohua Li UNSUPPORTED_MDDEV_FLAGS);
33786995f0b2SShaohua Li }
3379709ae487SNeilBrown return conf;
3380709ae487SNeilBrown }
3381709ae487SNeilBrown return ERR_PTR(-EINVAL);
3382709ae487SNeilBrown }
33831da177e4SLinus Torvalds
338484fc4b56SNeilBrown static struct md_personality raid1_personality =
33851da177e4SLinus Torvalds {
33861da177e4SLinus Torvalds .name = "raid1",
33872604b703SNeilBrown .level = 1,
33881da177e4SLinus Torvalds .owner = THIS_MODULE,
3389849674e4SShaohua Li .make_request = raid1_make_request,
3390849674e4SShaohua Li .run = raid1_run,
3391afa0f557SNeilBrown .free = raid1_free,
3392849674e4SShaohua Li .status = raid1_status,
3393849674e4SShaohua Li .error_handler = raid1_error,
33941da177e4SLinus Torvalds .hot_add_disk = raid1_add_disk,
33951da177e4SLinus Torvalds .hot_remove_disk= raid1_remove_disk,
33961da177e4SLinus Torvalds .spare_active = raid1_spare_active,
3397849674e4SShaohua Li .sync_request = raid1_sync_request,
33981da177e4SLinus Torvalds .resize = raid1_resize,
339980c3a6ceSDan Williams .size = raid1_size,
340063c70c4fSNeilBrown .check_reshape = raid1_reshape,
340136fa3063SNeilBrown .quiesce = raid1_quiesce,
3402709ae487SNeilBrown .takeover = raid1_takeover,
34031da177e4SLinus Torvalds };
34041da177e4SLinus Torvalds
raid_init(void)34051da177e4SLinus Torvalds static int __init raid_init(void)
34061da177e4SLinus Torvalds {
34072604b703SNeilBrown return register_md_personality(&raid1_personality);
34081da177e4SLinus Torvalds }
34091da177e4SLinus Torvalds
raid_exit(void)34101da177e4SLinus Torvalds static void raid_exit(void)
34111da177e4SLinus Torvalds {
34122604b703SNeilBrown unregister_md_personality(&raid1_personality);
34131da177e4SLinus Torvalds }
34141da177e4SLinus Torvalds
34151da177e4SLinus Torvalds module_init(raid_init);
34161da177e4SLinus Torvalds module_exit(raid_exit);
34171da177e4SLinus Torvalds MODULE_LICENSE("GPL");
34180efb9e61SNeilBrown MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD");
34191da177e4SLinus Torvalds MODULE_ALIAS("md-personality-3"); /* RAID1 */
3420d9d166c2SNeilBrown MODULE_ALIAS("md-raid1");
34212604b703SNeilBrown MODULE_ALIAS("md-level-1");
3422