Linux 4.14-rc6
[linux-block.git] / drivers / md / raid1-10.c
CommitLineData
be453e77
ML
1/* Maximum size of each resync request */
2#define RESYNC_BLOCK_SIZE (64*1024)
3#define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE)
4
5/* for managing resync I/O pages */
6struct resync_pages {
7 void *raid_bio;
8 struct page *pages[RESYNC_PAGES];
9};
10
11static inline int resync_alloc_pages(struct resync_pages *rp,
12 gfp_t gfp_flags)
13{
14 int i;
15
16 for (i = 0; i < RESYNC_PAGES; i++) {
17 rp->pages[i] = alloc_page(gfp_flags);
18 if (!rp->pages[i])
19 goto out_free;
20 }
21
22 return 0;
23
24out_free:
25 while (--i >= 0)
26 put_page(rp->pages[i]);
27 return -ENOMEM;
28}
29
30static inline void resync_free_pages(struct resync_pages *rp)
31{
32 int i;
33
34 for (i = 0; i < RESYNC_PAGES; i++)
35 put_page(rp->pages[i]);
36}
37
38static inline void resync_get_all_pages(struct resync_pages *rp)
39{
40 int i;
41
42 for (i = 0; i < RESYNC_PAGES; i++)
43 get_page(rp->pages[i]);
44}
45
46static inline struct page *resync_fetch_page(struct resync_pages *rp,
47 unsigned idx)
48{
49 if (WARN_ON_ONCE(idx >= RESYNC_PAGES))
50 return NULL;
51 return rp->pages[idx];
52}
53
54/*
55 * 'strct resync_pages' stores actual pages used for doing the resync
56 * IO, and it is per-bio, so make .bi_private points to it.
57 */
58static inline struct resync_pages *get_resync_pages(struct bio *bio)
59{
60 return bio->bi_private;
61}
62
fb0eb5df
ML
63/* generally called after bio_reset() for reseting bvec */
64static void md_bio_reset_resync_pages(struct bio *bio, struct resync_pages *rp,
65 int size)
66{
67 int idx = 0;
68
69 /* initialize bvec table again */
70 do {
71 struct page *page = resync_fetch_page(rp, idx);
72 int len = min_t(int, size, PAGE_SIZE);
73
74 /*
75 * won't fail because the vec table is big
76 * enough to hold all these pages
77 */
78 bio_add_page(bio, page, len, 0);
79 size -= len;
80 } while (idx++ < RESYNC_PAGES && size > 0);
81}