From: Mikulas Patocka <mpatocka@redhat.com>
Introduce "flush failed" variable. When 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'll set all regions as not-in-sync, set the variable "flush_failed" that
will prevent setting the in-sync bit in the future.
A target reload is the only way how to get out of this situation.
The variable will be set in further patches.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
---
drivers/md/dm-log.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
Index: linux-2.6.30/drivers/md/dm-log.c
===================================================================
--- linux-2.6.30.orig/drivers/md/dm-log.c
+++ linux-2.6.30/drivers/md/dm-log.c
@@ -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;
@@ -393,6 +394,7 @@ static int create_log_context(struct dm_
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;
@@ -705,7 +707,8 @@ static void core_mark_region(struct dm_d
static void core_clear_region(struct dm_dirty_log *log, region_t region)
{
struct log_c *lc = (struct log_c *) log->context;
- log_set_bit(lc, lc->clean_bits, region);
+ if (likely(!lc->flush_failed))
+ log_set_bit(lc, lc->clean_bits, region);
}
static int core_get_resync_work(struct dm_dirty_log *log, region_t *region)