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Go Back   Linux Archive > Redhat > Device-mapper Development

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Old 04-16-2012, 11:45 PM
Jonathan Brassow
Default dm-raid: set recovery flags on resume

Set recovery flags so that recovery restarts when DM device is resumed.

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 before
calling 'mddev_resume'.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>

Index: linux-upstream/drivers/md/dm-raid.c
================================================== =================
--- linux-upstream.orig/drivers/md/dm-raid.c
+++ linux-upstream/drivers/md/dm-raid.c
@@ -1255,9 +1255,11 @@ static void raid_resume(struct dm_target
if (!rs->bitmap_loaded) {
rs->bitmap_loaded = 1;
- } else
+ } else {
+ set_bit(MD_RECOVERY_NEEDED, &rs->md.recovery);
+ clear_bit(MD_RECOVERY_FROZEN, &rs->md.recovery);
+ }

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