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| author | Ming Lei <tom.leiming@gmail.com> | 2016-11-22 08:57:21 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-11-22 08:57:21 -0700 |
| commit | 3a83f4677539bce8eaa2bca9ee9c20e172d7ab04 (patch) | |
| tree | edb5ffeed2c07c342bd6d9adb0180fab472c1666 /block/bio.c | |
| parent | 9a794fb9bddeda0b8c8c13858038318f3cbd4b7e (diff) | |
| download | lwn-3a83f4677539bce8eaa2bca9ee9c20e172d7ab04.tar.gz lwn-3a83f4677539bce8eaa2bca9ee9c20e172d7ab04.zip | |
block: bio: pass bvec table to bio_init()
Some drivers often use external bvec table, so introduce
this helper for this case. It is always safe to access the
bio->bi_io_vec in this way for this case.
After converting to this usage, it will becomes a bit easier
to evaluate the remaining direct access to bio->bi_io_vec,
so it can help to prepare for the following multipage bvec
support.
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Fixed up the new O_DIRECT cases.
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/bio.c')
| -rw-r--r-- | block/bio.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/block/bio.c b/block/bio.c index 2cf6ebabc68c..de257ced69b1 100644 --- a/block/bio.c +++ b/block/bio.c @@ -270,11 +270,15 @@ static void bio_free(struct bio *bio) } } -void bio_init(struct bio *bio) +void bio_init(struct bio *bio, struct bio_vec *table, + unsigned short max_vecs) { memset(bio, 0, sizeof(*bio)); atomic_set(&bio->__bi_remaining, 1); atomic_set(&bio->__bi_cnt, 1); + + bio->bi_io_vec = table; + bio->bi_max_vecs = max_vecs; } EXPORT_SYMBOL(bio_init); @@ -480,7 +484,7 @@ struct bio *bio_alloc_bioset(gfp_t gfp_mask, int nr_iovecs, struct bio_set *bs) return NULL; bio = p + front_pad; - bio_init(bio); + bio_init(bio, NULL, 0); if (nr_iovecs > inline_vecs) { unsigned long idx = 0; |