From e5dcdd80a60627371f40797426273048630dc8ca Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@cse.unsw.edu.au>
Date: Fri, 9 Sep 2005 16:23:41 -0700
Subject: [PATCH] [PATCH] md: fail IO request to md that require a barrier.
md does not yet support BIO_RW_BARRIER, so be honest about it and fail
(-EOPNOTSUPP) any such requests.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
drivers/md/linear.c | 5 +++++
drivers/md/multipath.c | 5 +++++
drivers/md/raid0.c | 5 +++++
drivers/md/raid1.c | 4 ++++
drivers/md/raid10.c | 5 +++++
drivers/md/raid5.c | 5 +++++
drivers/md/raid6main.c | 5 +++++
7 files changed, 34 insertions(+)
diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index 8d740013d74d5..4991ba543368a 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -238,6 +238,11 @@ static int linear_make_request (request_queue_t *q, struct bio *bio)
dev_info_t *tmp_dev;
sector_t block;
+ if (unlikely(bio_barrier(bio))) {
+ bio_endio(bio, bio->bi_size, -EOPNOTSUPP);
+ return 0;
+ }
+
if (bio_data_dir(bio)==WRITE) {
disk_stat_inc(mddev->gendisk, writes);
disk_stat_add(mddev->gendisk, write_sectors, bio_sectors(bio));
diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index 2d2ca7fa02652..286342375fb7f 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -169,6 +169,11 @@ static int multipath_make_request (request_queue_t *q, struct bio * bio)
struct multipath_bh * mp_bh;
struct multipath_info *multipath;
+ if (unlikely(bio_barrier(bio))) {
+ bio_endio(bio, bio->bi_size, -EOPNOTSUPP);
+ return 0;
+ }
+
mp_bh = mempool_alloc(conf->pool, GFP_NOIO);
mp_bh->master_bio = bio;
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 2120710172c54..f6757259ce7fe 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -404,6 +404,11 @@ static int raid0_make_request (request_queue_t *q, struct bio *bio)
unsigned long chunk;
sector_t block, rsect;
+ if (unlikely(bio_barrier(bio))) {
+ bio_endio(bio, bio->bi_size, -EOPNOTSUPP);
+ return 0;
+ }
+
if (bio_data_dir(bio)==WRITE) {
disk_stat_inc(mddev->gendisk, writes);
disk_stat_add(mddev->gendisk, write_sectors, bio_sectors(bio));
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 51d9645ed09c5..ace41c571aeb3 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -555,6 +555,10 @@ static int make_request(request_queue_t *q, struct bio * bio)
unsigned long flags;
struct bio_list bl;
+ if (unlikely(bio_barrier(bio))) {
+ bio_endio(bio, bio->bi_size, -EOPNOTSUPP);
+ return 0;
+ }
/*
* Register the new request and wait if the reconstruction
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 7239079203ec1..5e0b333793d5b 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -669,6 +669,11 @@ static int make_request(request_queue_t *q, struct bio * bio)
int i;
int chunk_sects = conf->chunk_mask + 1;
+ if (unlikely(bio_barrier(bio))) {
+ bio_endio(bio, bio->bi_size, -EOPNOTSUPP);
+ return 0;
+ }
+
/* If this request crosses a chunk boundary, we need to
* split it. This will only happen for 1 PAGE (or less) requests.
*/
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 43f231a467d5c..ed859e08d600f 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -1411,6 +1411,11 @@ static int make_request (request_queue_t *q, struct bio * bi)
sector_t logical_sector, last_sector;
struct stripe_head *sh;
+ if (unlikely(bio_barrier(bi))) {
+ bio_endio(bi, bi->bi_size, -EOPNOTSUPP);
+ return 0;
+ }
+
md_write_start(mddev, bi);
if (bio_data_dir(bi)==WRITE) {
diff --git a/drivers/md/raid6main.c b/drivers/md/raid6main.c
index 495dee1d1e833..09cb7272c09f9 100644
--- a/drivers/md/raid6main.c
+++ b/drivers/md/raid6main.c
@@ -1570,6 +1570,11 @@ static int make_request (request_queue_t *q, struct bio * bi)
sector_t logical_sector, last_sector;
struct stripe_head *sh;
+ if (unlikely(bio_barrier(bi))) {
+ bio_endio(bi, bi->bi_size, -EOPNOTSUPP);
+ return 0;
+ }
+
md_write_start(mddev, bi);
if (bio_data_dir(bi)==WRITE) {
--
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