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MD: add journal with array suspended

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Hot add journal disk in recovery thread context brings a lot of trouble
as IO could be running. Unlike spare disk hot add, adding journal disk
with array suspended makes more sense and implmentation is much easier.

Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>
This commit is contained in:
Shaohua Li 2016-01-06 14:37:14 -08:00 committed by NeilBrown
parent a62ab49eb5
commit 87d4d91616
1 changed files with 6 additions and 1 deletions
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7
drivers/md/md.c
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@ -2455,15 +2455,20 @@ static int add_bound_rdev(struct md_rdev *rdev)
{
struct mddev *mddev = rdev->mddev;
int err = 0;
bool add_journal = test_bit(Journal, &rdev->flags);
if (!mddev->pers->hot_remove_disk) {
if (!mddev->pers->hot_remove_disk || add_journal) {
/* If there is hot_add_disk but no hot_remove_disk
* then added disks for geometry changes,
* and should be added immediately.
*/
super_types[mddev->major_version].
validate_super(mddev, rdev);
if (add_journal)
mddev_suspend(mddev);
err = mddev->pers->hot_add_disk(mddev, rdev);
if (add_journal)
mddev_resume(mddev);
if (err) {
unbind_rdev_from_array(rdev);
export_rdev(rdev);