[PATCH] md: return a non-zero error to bi_end_io as appropriate in raid5

Currently raid5 depends on clearing the BIO_UPTODATE flag to signal an error
to higher levels.  While this should be sufficient, it is safer to explicitly
set the error code as well - less room for confusion.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 12 insertions, 4 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 347caab99ca0..377f8bc9b78b 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -1818,7 +1818,9 @@ static void handle_stripe5(struct stripe_head *sh)
                 return_bi = bi->bi_next;
                 bi->bi_next = NULL;
                 bi->bi_size = 0;
-                bi->bi_end_io(bi, bytes, 0);
+                bi->bi_end_io(bi, bytes,
+                              test_bit(BIO_UPTODATE, &bi->bi_flags)
+                                ? 0 : -EIO);
         }
         for (i=disks; i-- ;) {
                 int rw;
@@ -2359,7 +2361,9 @@ static void handle_stripe6(struct stripe_head *sh, struct page *tmp_page)
                 return_bi = bi->bi_next;
                 bi->bi_next = NULL;
                 bi->bi_size = 0;
-                bi->bi_end_io(bi, bytes, 0);
+                bi->bi_end_io(bi, bytes,
+                              test_bit(BIO_UPTODATE, &bi->bi_flags)
+                                ? 0 : -EIO);
         }
         for (i=disks; i-- ;) {
                 int rw;
@@ -2859,7 +2863,9 @@ static int make_request(request_queue_t *q, struct bio * bi)
                 if ( rw == WRITE )
                         md_write_end(mddev);
                 bi->bi_size = 0;
-                bi->bi_end_io(bi, bytes, 0);
+                bi->bi_end_io(bi, bytes,
+                              test_bit(BIO_UPTODATE, &bi->bi_flags)
+                                ? 0 : -EIO);
         }
         return 0;
 }
@@ -3127,7 +3133,9 @@ static int  retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio)
                 int bytes = raid_bio->bi_size;
 
                 raid_bio->bi_size = 0;
-                raid_bio->bi_end_io(raid_bio, bytes, 0);
+                raid_bio->bi_end_io(raid_bio, bytes,
+                              test_bit(BIO_UPTODATE, &raid_bio->bi_flags)
+                                ? 0 : -EIO);
         }
         if (atomic_dec_and_test(&conf->active_aligned_reads))
                 wake_up(&conf->wait_for_stripe);