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md/raid5: use consistency_policy to remove journal feature 

When journal device of an array fails, the array is forced into read-only
mode. To make the array normal without adding another journal device, we
need to remove journal _feature_ from the array.

This patch allows remove journal _feature_ from an array, For journal
existing journal should be either missing or faulty.

To remove journal feature, it is necessary to remove the journal device
first:

  mdadm --fail /dev/md0 /dev/sdb
  mdadm: set /dev/sdb faulty in /dev/md0
  mdadm --remove /dev/md0 /dev/sdb
  mdadm: hot removed /dev/sdb from /dev/md0

Then the journal feature can be removed by echoing into the sysfs file:

 cat /sys/block/md0/md/consistency_policy
 journal

 echo resync > /sys/block/md0/md/consistency_policy
 cat /sys/block/md0/md/consistency_policy
 resync

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Song Liu 2017-03-27 10:51:33 -07:00 committed by Shaohua Li
parent 1ad45a9bc4
commit 0bb0c10500
1 changed files with 36 additions and 10 deletions
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46
drivers/md/raid5.c
View File

@ -8292,17 +8292,41 @@ static int raid5_change_consistency_policy(struct mddev *mddev, const char *buf)
}
if (strncmp(buf, "ppl", 3) == 0 && !raid5_has_ppl(conf)) {
mddev_suspend(mddev);
set_bit(MD_HAS_PPL, &mddev->flags);
err = log_init(conf, NULL);
if (!err)
/* ppl only works with RAID 5 */
if (conf->level == 5) {
mddev_suspend(mddev);
set_bit(MD_HAS_PPL, &mddev->flags);
err = log_init(conf, NULL);
if (!err)
raid5_reset_stripe_cache(mddev);
mddev_resume(mddev);
} else
err = -EINVAL;
} else if (strncmp(buf, "resync", 6) == 0) {
if (raid5_has_ppl(conf)) {
mddev_suspend(mddev);
log_exit(conf);
raid5_reset_stripe_cache(mddev);
mddev_resume(mddev);
} else if (strncmp(buf, "resync", 6) == 0 && raid5_has_ppl(conf)) {
mddev_suspend(mddev);
log_exit(conf);
raid5_reset_stripe_cache(mddev);
mddev_resume(mddev);
mddev_resume(mddev);
} else if (test_bit(MD_HAS_JOURNAL, &conf->mddev->flags) &&
r5l_log_disk_error(conf)) {
bool journal_dev_exists = false;
struct md_rdev *rdev;
rdev_for_each(rdev, mddev)
if (test_bit(Journal, &rdev->flags)) {
journal_dev_exists = true;
break;
}
if (!journal_dev_exists) {
mddev_suspend(mddev);
clear_bit(MD_HAS_JOURNAL, &mddev->flags);
mddev_resume(mddev);
} else /* need remove journal device first */
err = -EBUSY;
} else
err = -EINVAL;
} else {
err = -EINVAL;
}
@ -8337,6 +8361,7 @@ static struct md_personality raid6_personality =
.quiesce = raid5_quiesce,
.takeover = raid6_takeover,
.congested = raid5_congested,
.change_consistency_policy = raid5_change_consistency_policy,
};
static struct md_personality raid5_personality =
{
@ -8385,6 +8410,7 @@ static struct md_personality raid4_personality =
.quiesce = raid5_quiesce,
.takeover = raid4_takeover,
.congested = raid5_congested,
.change_consistency_policy = raid5_change_consistency_policy,
};
static int __init raid5_init(void)