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authorNamhyung Kim <namhyung@gmail.com>2011-06-14 14:20:19 +1000
committerGreg Kroah-Hartman <gregkh@suse.de>2011-06-23 15:24:08 -0700
commitc0877c4bc4ac2d8a510e3b1a45a4f1eb18cf2a5e (patch)
tree990f70c5d4da9044d80e5d3e487b25a152efe850 /drivers
parent6f4976aa404e521e7d57f1b703856210a3669683 (diff)
downloadlinux-linaro-stable-c0877c4bc4ac2d8a510e3b1a45a4f1eb18cf2a5e.tar.gz
md/raid5: fix FUA request handling in ops_run_io()
commit b062962edb086011e94ec4d9eb3f6a6d814f2a8f upstream. Commit e9c7469bb4f5 ("md: implment REQ_FLUSH/FUA support") introduced R5_WantFUA flag and set rw to WRITE_FUA in that case. However remaining code still checks whether rw is exactly same as WRITE or not, so FUAed-write ends up with being treated as READ. Fix it. This bug has been present since 2.6.37 and the fix is suitable for any -stable kernel since then. It is not clear why this has not caused more problems. Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/md/raid5.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 05e8eecdb079..cf59d64c1a36 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -446,7 +446,7 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
bi = &sh->dev[i].req;
bi->bi_rw = rw;
- if (rw == WRITE)
+ if (rw & WRITE)
bi->bi_end_io = raid5_end_write_request;
else
bi->bi_end_io = raid5_end_read_request;
@@ -480,13 +480,13 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
bi->bi_io_vec[0].bv_offset = 0;
bi->bi_size = STRIPE_SIZE;
bi->bi_next = NULL;
- if (rw == WRITE &&
+ if ((rw & WRITE) &&
test_bit(R5_ReWrite, &sh->dev[i].flags))
atomic_add(STRIPE_SECTORS,
&rdev->corrected_errors);
generic_make_request(bi);
} else {
- if (rw == WRITE)
+ if (rw & WRITE)
set_bit(STRIPE_DEGRADED, &sh->state);
pr_debug("skip op %ld on disc %d for sector %llu\n",
bi->bi_rw, i, (unsigned long long)sh->sector);