md/raid10: Don't skip more than 1 bitmap-chunk at a time during recovery.

When doing recovery on a raid10 with a write-intent bitmap, we only
need to recovery chunks that are flagged in the bitmap.

However if we choose to skip a chunk as it isn't flag, the code
currently skips the whole raid10-chunk, thus it might not recovery
some blocks that need recovering.

This patch fixes it.

In case that is confusing, it might help to understand that there
is a 'raid10 chunk size' which guides how data is distributed across
the devices, and a 'bitmap chunk size' which says how much data
corresponds to a single bit in the bitmap.

This bug only affects cases where the bitmap chunk size is smaller
than the raid10 chunk size.

Cc: stable@kernel.org
Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 6736d6d..118f89e 100644 (file)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2010,13 +2010,13 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
        /* There is nowhere to write, so all non-sync
         * drives must be failed, so try the next chunk...
         */
-       {
-       sector_t sec = max_sector - sector_nr;
-       sectors_skipped += sec;
+       if (sector_nr + max_sync < max_sector)
+               max_sector = sector_nr + max_sync;
+
+       sectors_skipped += (max_sector - sector_nr);
        chunks_skipped ++;
        sector_nr = max_sector;
        goto skipped;
-       }
 }
 
 static int run(mddev_t *mddev)