[PATCH] md: count corrected read errors per drive

Store this total in superblock (As appropriate), and make it available to
userspace via sysfs.

Signed-off-by: Neil Brown <neilb@suse.de>
Acked-by: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 8 insertions, 3 deletions

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 201dc7168a5f..9e658e519a27 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1122,9 +1122,13 @@ static int end_sync_read(struct bio *bio, unsigned int bytes_done, int error)
 
         if (test_bit(BIO_UPTODATE, &bio->bi_flags))
                 set_bit(R10BIO_Uptodate, &r10_bio->state);
-        else if (!test_bit(MD_RECOVERY_SYNC, &conf->mddev->recovery))
-                md_error(r10_bio->mddev,
-                         conf->mirrors[d].rdev);
+        else {
+                atomic_add(r10_bio->sectors,
+                           &conf->mirrors[d].rdev->corrected_errors);
+                if (!test_bit(MD_RECOVERY_SYNC, &conf->mddev->recovery))
+                        md_error(r10_bio->mddev,
+                                 conf->mirrors[d].rdev);
+        }
 
         /* for reconstruct, we always reschedule after a read.
          * for resync, only after all reads
@@ -1430,6 +1434,7 @@ static void raid10d(mddev_t *mddev)
                                                 sl--;
                                                 d = r10_bio->devs[sl].devnum;
                                                 rdev = conf->mirrors[d].rdev;
+                                                atomic_add(s, &rdev->corrected_errors);
                                                 if (rdev &&
                                                     test_bit(In_sync, &rdev->flags)) {
                                                         if (sync_page_io(rdev->bdev,