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raid5-ppl: support disk hot add/remove with PPL

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Add a function to modify the log by removing an rdev when a drive fails
or adding when a spare/replacement is activated as a raid member.

Removing a disk just clears the child log rdev pointer. No new stripes
will be accepted for this child log in ppl_write_stripe() and running io
units will be processed without writing PPL to the device.

Adding a disk sets the child log rdev pointer and writes an empty PPL
header.

Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Artur Paszkiewicz
2017-03-09 10:00:02 +01:00
committed by Shaohua Li
parent 4536bf9ba2
commit 6358c239d8
3 changed files with 64 additions and 2 deletions
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12
drivers/md/raid5.c
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@@ -7648,6 +7648,11 @@ static int raid5_remove_disk(struct mddev *mddev, struct md_rdev *rdev)
*rdevp = rdev;
}
}
if (!err) {
err = log_modify(conf, rdev, false);
if (err)
goto abort;
}
if (p->replacement) {
/* We must have just cleared 'rdev' */
p->rdev = p->replacement;
@@ -7657,6 +7662,9 @@ static int raid5_remove_disk(struct mddev *mddev, struct md_rdev *rdev)
*/
p->replacement = NULL;
clear_bit(WantReplacement, &rdev->flags);
if (!err)
err = log_modify(conf, p->rdev, true);
} else
/* We might have just removed the Replacement as faulty-
* clear the bit just in case
@@ -7713,10 +7721,12 @@ static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev)
if (p->rdev == NULL) {
clear_bit(In_sync, &rdev->flags);
rdev->raid_disk = disk;
err = 0;
if (rdev->saved_raid_disk != disk)
conf->fullsync = 1;
rcu_assign_pointer(p->rdev, rdev);
err = log_modify(conf, rdev, true);
goto out;
}
}