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authorJonathan Brassow <jbrassow@redhat.com>2012-05-22 13:55:29 +1000
committerNeilBrown <neilb@suse.de>2012-05-22 13:55:29 +1000
commit47525e59e40ffb8cbc944c0055e9c4902cd3ee99 (patch)
tree1ca2a32689ee756c4aa542f3b8fe0afee796e2a9 /drivers/md
parent30b67645faadcdc32072f999796b99bd0a20f2d5 (diff)
DM RAID: Set recovery flags on resume
Properly initialize MD recovery flags when resuming device-mapper devices. When a device-mapper device is suspended, all I/O must stop. This is done by calling 'md_stop_writes' and 'mddev_suspend'. These calls in-turn manipulate the recovery flags - including setting 'MD_RECOVERY_FROZEN'. The DM device may have been suspended while recovery was not yet complete, so the process needs to pick-up where it left off. Since 'mddev_resume' does not unset 'MD_RECOVERY_FROZEN' and set 'MD_RECOVERY_NEEDED', we must do it ourselves. 'MD_RECOVERY_NEEDED' can safely be set in 'mddev_resume', but 'MD_RECOVERY_FROZEN' must be set outside of 'mddev_resume' due to how MD handles RAID reshaping. (e.g. It is possible for a user to delay reshaping a RAID5->RAID6 by purposefully setting 'MD_RECOVERY_FROZEN'. Clearing it in 'mddev_resume' would override the desired behavior.) Because 'mddev_resume' already unconditionally calls 'md_wakeup_thread(mddev->thread)' there is no need to make this call from 'raid_resume' since it calls 'mddev_resume'. Also clean up where level_store calls mddev_resume() - it current duplicates some of the funcitons of that call. - NB Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-raid.c4
-rw-r--r--drivers/md/md.c5
2 files changed, 4 insertions, 5 deletions
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 73a068da10d9..ea2d90c78f78 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -1252,9 +1252,9 @@ static void raid_resume(struct dm_target *ti)
if (!rs->bitmap_loaded) {
bitmap_load(&rs->md);
rs->bitmap_loaded = 1;
- } else
- md_wakeup_thread(rs->md.thread);
+ }
+ clear_bit(MD_RECOVERY_FROZEN, &rs->md.recovery);
mddev_resume(&rs->md);
}
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 86adf4ac46cf..4c9836885d3e 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -402,6 +402,7 @@ void mddev_resume(struct mddev *mddev)
wake_up(&mddev->sb_wait);
mddev->pers->quiesce(mddev, 0);
+ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
}
@@ -3673,10 +3674,8 @@ level_store(struct mddev *mddev, const char *buf, size_t len)
del_timer_sync(&mddev->safemode_timer);
}
pers->run(mddev);
- mddev_resume(mddev);
set_bit(MD_CHANGE_DEVS, &mddev->flags);
- set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
- md_wakeup_thread(mddev->thread);
+ mddev_resume(mddev);
sysfs_notify(&mddev->kobj, NULL, "level");
md_new_event(mddev);
return rv;