struct bio_vec *bvl;
/*
- * If 'bs' is given, lookup the pool and do the mempool alloc.
- * If not, this is a bio_kmalloc() allocation and just do a
- * kzalloc() for the exact number of vecs right away.
- */
- if (!bs)
- bvl = kmalloc(nr * sizeof(struct bio_vec), gfp_mask);
-
- /*
* see comment near bvec_array define!
*/
switch (nr) {
bvec_free_bs(bs, bio->bi_io_vec, BIO_POOL_IDX(bio));
if (bio_integrity(bio))
- bio_integrity_free(bio, bs);
+ bio_integrity_free(bio);
/*
* If we have front padding, adjust the bio pointer before freeing
mempool_free(p, bs->bio_pool);
}
-/*
- * default destructor for a bio allocated with bio_alloc_bioset()
- */
-static void bio_fs_destructor(struct bio *bio)
-{
- bio_free(bio, fs_bio_set);
-}
-
-static void bio_kmalloc_destructor(struct bio *bio)
-{
- if (bio_has_allocated_vec(bio))
- kfree(bio->bi_io_vec);
- kfree(bio);
-}
-
void bio_init(struct bio *bio)
{
memset(bio, 0, sizeof(*bio));
**/
struct bio *bio_alloc_bioset(gfp_t gfp_mask, int nr_iovecs, struct bio_set *bs)
{
- struct bio *bio = NULL;
-
- if (bs) {
- void *p = mempool_alloc(bs->bio_pool, gfp_mask);
-
- if (p)
- bio = p + bs->front_pad;
- } else
- bio = kmalloc(sizeof(*bio), gfp_mask);
-
- 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(bio, 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;
+ unsigned long idx = BIO_POOL_NONE;
+ struct bio_vec *bvl = NULL;
+ struct bio *bio;
+ void *p;
+
+ p = mempool_alloc(bs->bio_pool, gfp_mask);
+ if (unlikely(!p))
+ return NULL;
+ bio = p + bs->front_pad;
+
+ 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:
+out_set:
+ bio->bi_flags |= idx << BIO_POOL_OFFSET;
+ bio->bi_max_vecs = nr_iovecs;
+ bio->bi_io_vec = bvl;
return bio;
+
+err_free:
+ mempool_free(p, bs->bio_pool);
+ return NULL;
+}
+
+static void bio_fs_destructor(struct bio *bio)
+{
+ bio_free(bio, fs_bio_set);
}
+/**
+ * bio_alloc - allocate a new bio, memory pool backed
+ * @gfp_mask: allocation mask to use
+ * @nr_iovecs: number of iovecs
+ *
+ * Allocate a new bio with @nr_iovecs bvecs. If @gfp_mask
+ * contains __GFP_WAIT, the allocation is guaranteed to succeed.
+ *
+ * RETURNS:
+ * Pointer to new bio on success, NULL on failure.
+ */
struct bio *bio_alloc(gfp_t gfp_mask, int nr_iovecs)
{
struct bio *bio = bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set);
return bio;
}
-/*
- * Like bio_alloc(), but doesn't use a mempool backing. This means that
- * it CAN fail, but while bio_alloc() can only be used for allocations
- * that have a short (finite) life span, bio_kmalloc() should be used
- * for more permanent bio allocations (like allocating some bio's for
- * initalization or setup purposes).
- */
+static void bio_kmalloc_destructor(struct bio *bio)
+{
+ if (bio_integrity(bio))
+ bio_integrity_free(bio);
+ kfree(bio);
+}
+
+/**
+ * bio_alloc - allocate a bio for I/O
+ * @gfp_mask: the GFP_ mask given to the slab allocator
+ * @nr_iovecs: number of iovecs to pre-allocate
+ *
+ * Description:
+ * bio_alloc will allocate a bio and associated bio_vec array that can hold
+ * at least @nr_iovecs entries. Allocations will be done from the
+ * fs_bio_set. Also see @bio_alloc_bioset.
+ *
+ * If %__GFP_WAIT is set, then bio_alloc will always be able to allocate
+ * a bio. This is due to the mempool guarantees. To make this work, callers
+ * must never allocate more than 1 bio at the time from this pool. Callers
+ * that need to allocate more than 1 bio must always submit the previously
+ * allocate bio for IO before attempting to allocate a new one. Failure to
+ * do so can cause livelocks under memory pressure.
+ *
+ **/
struct bio *bio_kmalloc(gfp_t gfp_mask, int nr_iovecs)
{
- struct bio *bio = bio_alloc_bioset(gfp_mask, nr_iovecs, NULL);
+ struct bio *bio;
- if (bio)
- bio->bi_destructor = bio_kmalloc_destructor;
+ bio = kmalloc(sizeof(struct bio) + nr_iovecs * sizeof(struct bio_vec),
+ gfp_mask);
+ if (unlikely(!bio))
+ return NULL;
+
+ bio_init(bio);
+ bio->bi_flags |= BIO_POOL_NONE << BIO_POOL_OFFSET;
+ bio->bi_max_vecs = nr_iovecs;
+ bio->bi_io_vec = bio->bi_inline_vecs;
+ bio->bi_destructor = bio_kmalloc_destructor;
return bio;
}
if (bio_integrity(bio)) {
int ret;
- ret = bio_integrity_clone(b, bio, fs_bio_set);
+ ret = bio_integrity_clone(b, bio, gfp_mask);
- if (ret < 0)
+ if (ret < 0) {
+ bio_put(b);
return NULL;
+ }
}
return b;
len += iov[i].iov_len;
}
+ if (offset)
+ nr_pages++;
+
bmd = bio_alloc_map_data(nr_pages, iov_count, gfp_mask);
if (!bmd)
return ERR_PTR(-ENOMEM);
ret = -ENOMEM;
- bio = bio_alloc(gfp_mask, nr_pages);
+ bio = bio_kmalloc(gfp_mask, nr_pages);
if (!bio)
goto out_bmd;
if (!nr_pages)
return ERR_PTR(-EINVAL);
- bio = bio_alloc(gfp_mask, nr_pages);
+ bio = bio_kmalloc(gfp_mask, nr_pages);
if (!bio)
return ERR_PTR(-ENOMEM);
int offset, i;
struct bio *bio;
- bio = bio_alloc(gfp_mask, nr_pages);
+ bio = bio_kmalloc(gfp_mask, nr_pages);
if (!bio)
return ERR_PTR(-ENOMEM);
}
/*
- * split a bio - only worry about a bio with a single page
- * in it's iovec
+ * split a bio - only worry about a bio with a single page in its iovec
*/
struct bio_pair *bio_split(struct bio *bi, int first_sectors)
{
if (bs->bio_pool)
mempool_destroy(bs->bio_pool);
- bioset_integrity_free(bs);
biovec_free_pools(bs);
bio_put_slab(bs);
if (!bs->bio_pool)
goto bad;
- if (bioset_integrity_create(bs, pool_size))
- goto bad;
-
if (!biovec_create_pools(bs, pool_size))
return bs;
int size;
struct biovec_slab *bvs = bvec_slabs + i;
+#ifndef CONFIG_BLK_DEV_INTEGRITY
+ if (bvs->nr_vecs <= BIO_INLINE_VECS) {
+ bvs->slab = NULL;
+ continue;
+ }
+#endif
+
size = bvs->nr_vecs * sizeof(struct bio_vec);
bvs->slab = kmem_cache_create(bvs->name, size, 0,
SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
if (!bio_slabs)
panic("bio: can't allocate bios\n");
- bio_integrity_init_slab();
biovec_init_slabs();
fs_bio_set = bioset_create(BIO_POOL_SIZE, 0);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff