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md/raid1: store behind-write pages in bi_vecs.

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When performing write-behind we allocate pages to store the data
during write.
Previously we just keep a list of pages.  Now we keep a list of
bi_vec which includes offset and size.
This means that the r1bio has complete information to create a new
bio which will be needed for retrying after write errors.

Signed-off-by: NeilBrown <neilb@suse.de>
Reviewed-by: Namhyung Kim <namhyung@gmail.com>
This commit is contained in:
NeilBrown
2011-07-28 11:32:10 +10:00
parent 4367af5561
commit 2ca68f5ed7
2 changed files with 18 additions and 17 deletions
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2
drivers/md/raid1.h
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@@ -101,7 +101,7 @@ struct r1bio_s {
struct list_head retry_list;
/* Next two are only valid when R1BIO_BehindIO is set */
struct page **behind_pages;
struct bio_vec *behind_bvecs;
int behind_page_count;
/*
* if the IO is in WRITE direction, then multiple bios are used.