diff options
| author |   Ming Lei <tom.leiming@gmail.com> | 2017-03-17 00:12:31 +0800 |
|---|---|---|
| committer |   Shaohua Li <shli@fb.com> | 2017-03-24 10:41:37 -0700 |
| commit | 841c1316c7da6199a7df473893c141943991a756 (patch) | |
| tree | 77bd223263ff1bc03d860f16b4ba4f60571e62b7 /drivers/md/raid1.h | |
| parent | md: raid1: move 'offset' out of loop (diff) | |
| download | linux-dev-841c1316c7da6199a7df473893c141943991a756.tar.xz linux-dev-841c1316c7da6199a7df473893c141943991a756.zip | |
md: raid1: improve write behind
This patch improve handling of write behind in the following ways:
- introduce behind master bio to hold all write behind pages
- fast clone bios from behind master bio
- avoid to change bvec table directly
- use bio_copy_data() and make code more clean
Suggested-by: Shaohua Li <shli@fb.com>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Diffstat (limited to 'drivers/md/raid1.h')
| -rw-r--r-- | drivers/md/raid1.h | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/md/raid1.h b/drivers/md/raid1.h index dd22a37d0d83..4271cd7ac2de 100644 --- a/drivers/md/raid1.h +++ b/drivers/md/raid1.h @@ -153,9 +153,13 @@ struct r1bio { int read_disk; struct list_head retry_list; - /* Next two are only valid when R1BIO_BehindIO is set */ - struct bio_vec *behind_bvecs; - int behind_page_count; + + /* + * When R1BIO_BehindIO is set, we store pages for write behind + * in behind_master_bio. + */ + struct bio *behind_master_bio; + /* * if the IO is in WRITE direction, then multiple bios are used. * We choose the number when they are allocated. |