[PATCH 1/3] md/raid5: fix raid5_set_bi_hw_segments

The @bio->bi_phys_segments consists of active stripes count in the
lower 16 bits and processed stripes count in the upper 16 bits. So
logical-OR operator should be bitwise one.

Signed-off-by: Namhyung Kim
---
drivers/md/raid5.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 346e69bfdab3..fa6ac70dc72f 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -129,7 +129,7 @@ static inline int raid5_dec_bi_hw_segments(struct bio *bio)

static inline void raid5_set_bi_hw_segments(struct bio *bio, unsigned int cnt)
{
- bio->bi_phys_segments = raid5_bi_phys_segments(bio) || (cnt << 16);
+ bio->bi_phys_segments = raid5_bi_phys_segments(bio) | (cnt << 16);
}

/* Find first data disk in a raid6 stripe */
--
1.7.5.2

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[PATCH 2/3] 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.

Cc: Tejun Heo
Signed-off-by: Namhyung Kim
---
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 fa6ac70dc72f..026452bbb030 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);
--
1.7.5.2

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[PATCH 3/3] md/raid5: remove unusual use of bio_iovec_idx()

In the bio_for_each_segment loop, bvl always points current
bio_vec, so the same as bio_iovec_idx(, i). Let's get rid of
it.

Cc: Dan Williams
Signed-off-by: Namhyung Kim
---
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 026452bbb030..0760716d0e3e 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -585,7 +585,7 @@ async_copy_data(int frombio, struct bio *bio, struct page *page,
init_async_submit(&submit, flags, tx, NULL, NULL, NULL);

bio_for_each_segment(bvl, bio, i) {
- int len = bio_iovec_idx(bio, i)->bv_len;
+ int len = bvl->bv_len;
int clen;
int b_offset = 0;

@@ -601,8 +601,8 @@ async_copy_data(int frombio, struct bio *bio, struct page *page,
clen = len;

if (clen > 0) {
- b_offset += bio_iovec_idx(bio, i)->bv_offset;
- bio_page = bio_iovec_idx(bio, i)->bv_page;
+ b_offset += bvl->bv_offset;
+ bio_page = bvl->bv_page;
if (frombio)
tx = async_memcpy(page, bio_page, page_offset,
b_offset, clen, &submit);
--
1.7.5.2

Re: [PATCH 1/3] md/raid5: fix raid5_set_bi_hw_segments

On Mon, 13 Jun 2011 23:48:22 +0900 Namhyung Kim wrote:

> The @bio->bi_phys_segments consists of active stripes count in the
> lower 16 bits and processed stripes count in the upper 16 bits. So
> logical-OR operator should be bitwise one.
>
> Signed-off-by: Namhyung Kim
> ---
> drivers/md/raid5.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
> index 346e69bfdab3..fa6ac70dc72f 100644
> --- a/drivers/md/raid5.c
> +++ b/drivers/md/raid5.c
> @@ -129,7 +129,7 @@ static inline int raid5_dec_bi_hw_segments(struct bio *bio)
>
> static inline void raid5_set_bi_hw_segments(struct bio *bio, unsigned int cnt)
> {
> - bio->bi_phys_segments = raid5_bi_phys_segments(bio) || (cnt << 16);
> + bio->bi_phys_segments = raid5_bi_phys_segments(bio) | (cnt << 16);
> }
>
> /* Find first data disk in a raid6 stripe */


Thanks for this and the other 2!!
I have added "Cc: stable@kernel.org" to the first two and applied them. I
expect to send them off to Linus later today.

Thanks,
NeilBrown