Commit 5adc78d0 authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Alasdair G Kergon
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dm log: introduce flush_failed variable 



Introduce "flush failed" variable.  When a flush before clearing a bit
in the log fails, we don't know anything about which which regions are
in-sync and which not.

So we need to set all regions as not-in-sync and set the variable
"flush_failed" to prevent setting the in-sync bit in the future.

A target reload is the only way to get out of this situation.

The variable will be set in following patches.

Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
parent 20a34a8e

drivers/md/dm-log.c

+4 −1
Original line number Diff line number Diff line
@@ -210,6 +210,7 @@ struct log_c { 
	struct dm_target *ti;

	int touched_dirtied;

	int touched_cleaned;

	int flush_failed;

	uint32_t region_size;

	unsigned int region_count;

	region_t sync_count;
@@ -394,6 +395,7 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti, 
	lc->ti = ti;

	lc->touched_dirtied = 0;

	lc->touched_cleaned = 0;

	lc->flush_failed = 0;

	lc->region_size = region_size;

	lc->region_count = region_count;

	lc->sync = sync;
@@ -706,6 +708,7 @@ static void core_mark_region(struct dm_dirty_log *log, region_t region) 
static void core_clear_region(struct dm_dirty_log *log, region_t region)

{

	struct log_c *lc = (struct log_c *) log->context;

	if (likely(!lc->flush_failed))

		log_set_bit(lc, lc->clean_bits, region);

}