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[PATCH] dm mirror log: sync_count fix 

When a mirror is reduced in size, clear the part of the bitmap that is no
longer used.

Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Alasdair G Kergon 2006-06-26 00:27:30 -07:00 committed by Linus Torvalds
parent 29121bd0b0
commit 8a835f11bc
1 changed files with 5 additions and 1 deletions
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6
drivers/md/dm-log.c
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@ -447,7 +447,7 @@ static int disk_resume(struct dirty_log *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 *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);