Commit 7f7583d4 authored by Jianpeng Ma's avatar Jianpeng Ma Committed by NeilBrown

Subject: [PATCH] md:change resync_mismatches to atomic64_t to avoid races

Now that multiple threads can handle stripes, it is safer to
use an atomic64_t for resync_mismatches, to avoid update races.
Signed-off-by: default avatarJianpeng Ma <majianpeng@gmail.com>
Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 1ed850f3
......@@ -4269,7 +4269,8 @@ static ssize_t
mismatch_cnt_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%llu\n",
(unsigned long long) mddev->resync_mismatches);
(unsigned long long)
atomic64_read(&mddev->resync_mismatches));
}
static struct md_sysfs_entry md_scan_mode =
......@@ -5235,7 +5236,7 @@ static void md_clean(struct mddev *mddev)
mddev->new_layout = 0;
mddev->new_chunk_sectors = 0;
mddev->curr_resync = 0;
mddev->resync_mismatches = 0;
atomic64_set(&mddev->resync_mismatches, 0);
mddev->suspend_lo = mddev->suspend_hi = 0;
mddev->sync_speed_min = mddev->sync_speed_max = 0;
mddev->recovery = 0;
......@@ -7357,7 +7358,7 @@ void md_do_sync(struct md_thread *thread)
* which defaults to physical size, but can be virtual size
*/
max_sectors = mddev->resync_max_sectors;
mddev->resync_mismatches = 0;
atomic64_set(&mddev->resync_mismatches, 0);
/* we don't use the checkpoint if there's a bitmap */
if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
j = mddev->resync_min;
......
......@@ -282,7 +282,7 @@ struct mddev {
sector_t resync_max_sectors; /* may be set by personality */
sector_t resync_mismatches; /* count of sectors where
atomic64_t resync_mismatches; /* count of sectors where
* parity/replica mismatch found
*/
......
......@@ -1876,7 +1876,7 @@ static int process_checks(struct r1bio *r1_bio)
} else
j = 0;
if (j >= 0)
mddev->resync_mismatches += r1_bio->sectors;
atomic64_add(r1_bio->sectors, &mddev->resync_mismatches);
if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)
&& test_bit(BIO_UPTODATE, &sbio->bi_flags))) {
/* No need to write to this device. */
......
......@@ -2011,7 +2011,7 @@ static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio)
break;
if (j == vcnt)
continue;
mddev->resync_mismatches += r10_bio->sectors;
atomic64_add(r10_bio->sectors, &mddev->resync_mismatches);
if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
/* Don't fix anything. */
continue;
......
......@@ -2973,7 +2973,7 @@ static void handle_parity_checks5(struct r5conf *conf, struct stripe_head *sh,
*/
set_bit(STRIPE_INSYNC, &sh->state);
else {
conf->mddev->resync_mismatches += STRIPE_SECTORS;
atomic64_add(STRIPE_SECTORS, &conf->mddev->resync_mismatches);
if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery))
/* don't try to repair!! */
set_bit(STRIPE_INSYNC, &sh->state);
......@@ -3125,7 +3125,7 @@ static void handle_parity_checks6(struct r5conf *conf, struct stripe_head *sh,
*/
}
} else {
conf->mddev->resync_mismatches += STRIPE_SECTORS;
atomic64_add(STRIPE_SECTORS, &conf->mddev->resync_mismatches);
if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery))
/* don't try to repair!! */
set_bit(STRIPE_INSYNC, &sh->state);
......
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