The patch titled
Subject: fs/direct-io.c: set bi_rw when allocating bio
has been added to the -mm tree. Its filename is
fs-direct-ioc-set-bi_rw-when-alloc-bio.patch
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From: majianpeng <majianpeng@xxxxxxxxx>
Subject: fs/direct-io.c: set bi_rw when allocating bio
When calling bio_alloc(), the bi_rw is zero. But after calling bio_add_page()
it will use bi_rw.
Fox example, in __bio_add_page() it will call merge_bvec_fn().
The merge_bvec_fn of raid456 will use the bi_rw to judge the merge:
if ((bvm->bi_rw & 1) == WRITE)
return biovec->bv_len; /* always allow writes to be mergeable */
Signed-off-by: Jianpeng Ma <majianpeng@xxxxxxxxx>
Reviewed-by: Jeff Moyer <jmoyer@xxxxxxxxxx>
Cc: Neil Brown <neilb@xxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/direct-io.c | 1 +
1 file changed, 1 insertion(+)
diff -puN fs/direct-io.c~fs-direct-ioc-set-bi_rw-when-alloc-bio fs/direct-io.c
--- a/fs/direct-io.c~fs-direct-ioc-set-bi_rw-when-alloc-bio
+++ a/fs/direct-io.c
@@ -349,6 +349,7 @@ dio_bio_alloc(struct dio *dio, struct di
bio->bi_bdev = bdev;
bio->bi_sector = first_sector;
+ bio->bi_rw = dio->rw;
if (dio->is_async)
bio->bi_end_io = dio_bio_end_aio;
else
_
Patches currently in -mm which might be from majianpeng@xxxxxxxxx are
origin.patch
linux-next.patch
fs-direct-ioc-set-bi_rw-when-alloc-bio.patch
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