diff options
| -rw-r--r-- | fs/bio.c | 71 |
1 files changed, 37 insertions, 34 deletions
@@ -301,48 +301,51 @@ void bio_init(struct bio *bio) **/ struct bio *bio_alloc_bioset(gfp_t gfp_mask, int nr_iovecs, struct bio_set *bs) { + struct bio_vec *bvl = NULL; struct bio *bio = NULL; - void *uninitialized_var(p); + unsigned long idx = 0; + void *p = NULL; if (bs) { p = mempool_alloc(bs->bio_pool, gfp_mask); - - if (p) - bio = p + bs->front_pad; - } else + if (!p) + goto err; + bio = p + bs->front_pad; + } else { bio = kmalloc(sizeof(*bio), gfp_mask); + if (!bio) + goto err; + } - if (likely(bio)) { - struct bio_vec *bvl = NULL; - - bio_init(bio); - if (likely(nr_iovecs)) { - unsigned long uninitialized_var(idx); - - if (nr_iovecs <= BIO_INLINE_VECS) { - idx = 0; - bvl = bio->bi_inline_vecs; - nr_iovecs = BIO_INLINE_VECS; - } else { - bvl = bvec_alloc_bs(gfp_mask, nr_iovecs, &idx, - bs); - nr_iovecs = bvec_nr_vecs(idx); - } - if (unlikely(!bvl)) { - if (bs) - mempool_free(p, bs->bio_pool); - else - kfree(bio); - bio = NULL; - goto out; - } - bio->bi_flags |= idx << BIO_POOL_OFFSET; - bio->bi_max_vecs = nr_iovecs; - } - bio->bi_io_vec = bvl; + bio_init(bio); + + if (unlikely(!nr_iovecs)) + goto out_set; + + if (nr_iovecs <= BIO_INLINE_VECS) { + bvl = bio->bi_inline_vecs; + nr_iovecs = BIO_INLINE_VECS; + } else { + bvl = bvec_alloc_bs(gfp_mask, nr_iovecs, &idx, bs); + if (unlikely(!bvl)) + goto err_free; + + nr_iovecs = bvec_nr_vecs(idx); } -out: + bio->bi_flags |= idx << BIO_POOL_OFFSET; + bio->bi_max_vecs = nr_iovecs; +out_set: + bio->bi_io_vec = bvl; + return bio; + +err_free: + if (bs) + mempool_free(p, bs->bio_pool); + else + kfree(bio); +err: + return NULL; } struct bio *bio_alloc(gfp_t gfp_mask, int nr_iovecs) |