When a mirror is reduced in size, clear the part of the bitmap that is
no longer used.
Signed-off-by: Alasdair G Kergon <[email protected]>
Index: linux-2.6.17/drivers/md/dm-log.c
===================================================================
--- linux-2.6.17.orig/drivers/md/dm-log.c 2006-06-21 17:17:56.000000000 +0100
+++ linux-2.6.17/drivers/md/dm-log.c 2006-06-21 17:17:56.000000000 +0100
@@ -447,7 +447,7 @@ static int disk_resume(struct dirty_log
if (r)
return r;
- /* set or clear any new bits */
+ /* set or clear any new bits -- device has grown */
if (lc->sync == NOSYNC)
for (i = lc->header.nr_regions; i < lc->region_count; i++)
/* FIXME: amazingly inefficient */
@@ -457,6 +457,10 @@ static int disk_resume(struct dirty_log
/* FIXME: amazingly inefficient */
log_clear_bit(lc, lc->clean_bits, i);
+ /* clear any old bits -- device has shrunk */
+ for (i = lc->region_count; i % (sizeof(*lc->clean_bits) << BYTE_SHIFT); i++)
+ log_clear_bit(lc, lc->clean_bits, i);
+
/* copy clean across to sync */
memcpy(lc->sync_bits, lc->clean_bits, size);
lc->sync_count = count_bits32(lc->clean_bits, lc->bitset_uint32_count);
-
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