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| author | Ming Lei <ming.lei@redhat.com> | 2017-12-18 20:22:10 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-01-06 09:18:00 -0700 |
| commit | 25d8be77e19224d8f21b363d77b5283c5dc21a57 (patch) | |
| tree | 4a07629635d9e2109caca1c0418208fc167f8082 /drivers/md/bcache/util.c | |
| parent | c2421edf5f9151d0eb28affbf76e9e4f8ddd03c6 (diff) | |
| download | linux-25d8be77e19224d8f21b363d77b5283c5dc21a57.tar.bz2 | |
block: move bio_alloc_pages() to bcache
bcache is the only user of bio_alloc_pages(), so move this function into
bcache, and avoid it being misused in the future.
Also rename it to bch_bio_allo_pages() since it is bcache only.
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md/bcache/util.c')
| -rw-r--r-- | drivers/md/bcache/util.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/md/bcache/util.c b/drivers/md/bcache/util.c index 61813d230015..a23cd6a14b74 100644 --- a/drivers/md/bcache/util.c +++ b/drivers/md/bcache/util.c @@ -283,6 +283,33 @@ start: bv->bv_len = min_t(size_t, PAGE_SIZE - bv->bv_offset, } } +/** + * bch_bio_alloc_pages - allocates a single page for each bvec in a bio + * @bio: bio to allocate pages for + * @gfp_mask: flags for allocation + * + * Allocates pages up to @bio->bi_vcnt. + * + * Returns 0 on success, -ENOMEM on failure. On failure, any allocated pages are + * freed. + */ +int bch_bio_alloc_pages(struct bio *bio, gfp_t gfp_mask) +{ + int i; + struct bio_vec *bv; + + bio_for_each_segment_all(bv, bio, i) { + bv->bv_page = alloc_page(gfp_mask); + if (!bv->bv_page) { + while (--bv >= bio->bi_io_vec) + __free_page(bv->bv_page); + return -ENOMEM; + } + } + + return 0; +} + /* * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group (Any * use permitted, subject to terms of PostgreSQL license; see.) |