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md/raid1-10: factor out a new helper raid1_should_read_first()

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If resync is in progress, read_balance() should find the first usable
disk, otherwise, data could be inconsistent after resync is done. raid1
and raid10 implement the same checking, hence factor out the checking
to make code cleaner.

Noted that raid1 is using 'mddev->recovery_cp', which is updated after
all resync IO is done, while raid10 is using 'conf->next_resync', which
is inaccurate because raid10 update it before submitting resync IO.
Fortunately, raid10 read IO can't concurrent with resync IO, hence there
is no problem. And this patch also switch raid10 to use
'mddev->recovery_cp'.

Co-developed-by: Paul Luse <paul.e.luse@linux.intel.com>
Signed-off-by: Paul Luse <paul.e.luse@linux.intel.com>
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Xiao Ni <xni@redhat.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20240229095714.926789-7-yukuai1@huaweicloud.com
This commit is contained in:
Yu Kuai 2024-02-29 17:57:09 +08:00 committed by Song Liu
parent f29841ff3b
commit f109207629
3 changed files with 24 additions and 24 deletions
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20
drivers/md/raid1-10.c
View File

@ -276,3 +276,23 @@ static inline int raid1_check_read_range(struct md_rdev *rdev,
*len = first_bad + bad_sectors - this_sector;
return 0;
}
/*
* Check if read should choose the first rdev.
*
* Balance on the whole device if no resync is going on (recovery is ok) or
* below the resync window. Otherwise, take the first readable disk.
*/
static inline bool raid1_should_read_first(struct mddev *mddev,
sector_t this_sector, int len)
{
if ((mddev->recovery_cp < this_sector + len))
return true;
if (mddev_is_clustered(mddev) &&
md_cluster_ops->area_resyncing(mddev, READ, this_sector,
this_sector + len))
return true;
return false;
}

15
drivers/md/raid1.c
View File

@ -605,11 +605,6 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect
struct md_rdev *rdev;
int choose_first;
/*
* Check if we can balance. We can balance on the whole
* device if no resync is going on, or below the resync window.
* We take the first readable disk when above the resync window.
*/
retry:
sectors = r1_bio->sectors;
best_disk = -1;
@ -619,16 +614,10 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect
best_pending_disk = -1;
min_pending = UINT_MAX;
best_good_sectors = 0;
choose_first = raid1_should_read_first(conf->mddev, this_sector,
sectors);
clear_bit(R1BIO_FailFast, &r1_bio->state);
if ((conf->mddev->recovery_cp < this_sector + sectors) ||
(mddev_is_clustered(conf->mddev) &&
md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector,
this_sector + sectors)))
choose_first = 1;
else
choose_first = 0;
for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) {
sector_t dist;
sector_t first_bad;

13
drivers/md/raid10.c
View File

@ -748,17 +748,8 @@ static struct md_rdev *read_balance(struct r10conf *conf,
best_good_sectors = 0;
do_balance = 1;
clear_bit(R10BIO_FailFast, &r10_bio->state);
/*
* Check if we can balance. We can balance on the whole
* device if no resync is going on (recovery is ok), or below
* the resync window. We take the first readable disk when
* above the resync window.
*/
if ((conf->mddev->recovery_cp < MaxSector
&& (this_sector + sectors >= conf->next_resync)) ||
(mddev_is_clustered(conf->mddev) &&
md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector,
this_sector + sectors)))
if (raid1_should_read_first(conf->mddev, this_sector, sectors))
do_balance = 0;
for (slot = 0; slot < conf->copies ; slot++) {