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author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-14 13:33:39 -0700 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-14 13:33:39 -0700 |
commit | f75f6ff2eaa626d32dd3225e3008f807741ad1c5 (patch) | |
tree | 91446916eff11bc8b900ca4a4a67561021354e53 /drivers/md/raid1-10.c | |
parent | c92316bf8e94830a0225f2e904cbdbd173768419 (diff) | |
parent | ef954844c7ace62f773f4f23e28d2d915adc419f (diff) | |
download | linux-next-f75f6ff2eaa626d32dd3225e3008f807741ad1c5.tar.gz |
Merge 4.13-rc5 into driver-core-next
We want the fixes in here as well for testing.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/md/raid1-10.c')
-rw-r--r-- | drivers/md/raid1-10.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/drivers/md/raid1-10.c b/drivers/md/raid1-10.c new file mode 100644 index 000000000000..9f2670b45f31 --- /dev/null +++ b/drivers/md/raid1-10.c @@ -0,0 +1,81 @@ +/* Maximum size of each resync request */ +#define RESYNC_BLOCK_SIZE (64*1024) +#define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) + +/* for managing resync I/O pages */ +struct resync_pages { + void *raid_bio; + struct page *pages[RESYNC_PAGES]; +}; + +static inline int resync_alloc_pages(struct resync_pages *rp, + gfp_t gfp_flags) +{ + int i; + + for (i = 0; i < RESYNC_PAGES; i++) { + rp->pages[i] = alloc_page(gfp_flags); + if (!rp->pages[i]) + goto out_free; + } + + return 0; + +out_free: + while (--i >= 0) + put_page(rp->pages[i]); + return -ENOMEM; +} + +static inline void resync_free_pages(struct resync_pages *rp) +{ + int i; + + for (i = 0; i < RESYNC_PAGES; i++) + put_page(rp->pages[i]); +} + +static inline void resync_get_all_pages(struct resync_pages *rp) +{ + int i; + + for (i = 0; i < RESYNC_PAGES; i++) + get_page(rp->pages[i]); +} + +static inline struct page *resync_fetch_page(struct resync_pages *rp, + unsigned idx) +{ + if (WARN_ON_ONCE(idx >= RESYNC_PAGES)) + return NULL; + return rp->pages[idx]; +} + +/* + * 'strct resync_pages' stores actual pages used for doing the resync + * IO, and it is per-bio, so make .bi_private points to it. + */ +static inline struct resync_pages *get_resync_pages(struct bio *bio) +{ + return bio->bi_private; +} + +/* generally called after bio_reset() for reseting bvec */ +static void md_bio_reset_resync_pages(struct bio *bio, struct resync_pages *rp, + int size) +{ + int idx = 0; + + /* initialize bvec table again */ + do { + struct page *page = resync_fetch_page(rp, idx); + int len = min_t(int, size, PAGE_SIZE); + + /* + * won't fail because the vec table is big + * enough to hold all these pages + */ + bio_add_page(bio, page, len, 0); + size -= len; + } while (idx++ < RESYNC_PAGES && size > 0); +} |