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| author | Yufen Yu <yuyufen@huawei.com> | 2020-08-20 09:22:06 -0400 |
|---|---|---|
| committer | Song Liu <songliubraving@fb.com> | 2020-09-24 16:44:44 -0700 |
| commit | 7aba13b7152979450270da5602f16f6f28fd35b8 (patch) | |
| tree | 64e455032f9c397c6af8988bd0ef6bde4088d81a /drivers/md/raid5.h | |
| parent | 313b825fa218bef78419d7b4092c1f4af222335d (diff) | |
| download | linux-7aba13b7152979450270da5602f16f6f28fd35b8.tar.bz2 | |
md/raid5: add a new member of offset into r5dev
Add a new member of offset into struct r5dev. It indicates the
offset of related dev[i].page. For now, since each device have a
privated page, the value is always 0. Thus, we set offset as 0
when allcate page in grow_buffers() and resize_stripes().
To support following different page offset, we try to use the page
offset rather than '0' directly for async_memcpy() and ops_run_io().
We try to support different page offset for xor compution functions
in the following. To avoid repeatly allocate a new array each time,
we add a memory region into scribble buffer to record offset.
No functional change.
Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Diffstat (limited to 'drivers/md/raid5.h')
| -rw-r--r-- | drivers/md/raid5.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index 16fc29472f5c..6afdd3a78580 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -253,6 +253,7 @@ struct stripe_head { struct bio req, rreq; struct bio_vec vec, rvec; struct page *page, *orig_page; + unsigned int offset; /* offset of the page */ struct bio *toread, *read, *towrite, *written; sector_t sector; /* sector of this page */ unsigned long flags; |