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| author | Namhyung Kim <namhyung@gmail.com> | 2011-06-14 14:20:19 +1000 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2011-06-14 14:20:19 +1000 |
| commit | b062962edb086011e94ec4d9eb3f6a6d814f2a8f (patch) | |
| tree | 4b832dab3687db5b719266d758a916bbc118e1f0 | |
| parent | 9b2dc8b665932a8e681a7ab3237f60475e75e161 (diff) | |
| download | kernel_samsung_smdk4412-b062962edb086011e94ec4d9eb3f6a6d814f2a8f.zip kernel_samsung_smdk4412-b062962edb086011e94ec4d9eb3f6a6d814f2a8f.tar.gz kernel_samsung_smdk4412-b062962edb086011e94ec4d9eb3f6a6d814f2a8f.tar.bz2 | |
md/raid5: fix FUA request handling in ops_run_io()
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>
Cc: stable@kernel.org
Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
| -rw-r--r-- | drivers/md/raid5.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index af8a9a8..b7dcc67 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -514,7 +514,7 @@ 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; @@ -548,13 +548,13 @@ 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); |