md/raid5: add a new member of offset into r5dev

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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>

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This commit is contained in:

Yufen Yu 2020-08-20 09:22:06 -04:00 • committed by Song Liu

parent 313b825fa2

commit 7aba13b715

2 changed files with 40 additions and 11 deletions

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drivers/md/raid5.c

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drivers/md/raid5.h

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