md/raid1,raid10: Fix calculation of 'vcnt' when processing error recovery.
If r1bio->sectors % 8 != 0,then the memcmp and a later
memcpy will omit the last bio_vec.
This is suitable for any stable kernel since 3.1 when bad-block
management was introduced.
Cc: stable@vger.kernel.org
Signed-off-by: majianpeng <majianpeng@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index fff7821..c8dbb84 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1788,6 +1788,7 @@
struct r10conf *conf = mddev->private;
int i, first;
struct bio *tbio, *fbio;
+ int vcnt;
atomic_set(&r10_bio->remaining, 1);
@@ -1802,10 +1803,10 @@
first = i;
fbio = r10_bio->devs[i].bio;
+ vcnt = (r10_bio->sectors + (PAGE_SIZE >> 9) - 1) >> (PAGE_SHIFT - 9);
/* now find blocks with errors */
for (i=0 ; i < conf->copies ; i++) {
int j, d;
- int vcnt = r10_bio->sectors >> (PAGE_SHIFT-9);
tbio = r10_bio->devs[i].bio;
@@ -1871,7 +1872,6 @@
*/
for (i = 0; i < conf->copies; i++) {
int j, d;
- int vcnt = r10_bio->sectors >> (PAGE_SHIFT-9);
tbio = r10_bio->devs[i].repl_bio;
if (!tbio || !tbio->bi_end_io)
