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authorKent Overstreet <koverstreet@google.com>2012-09-06 15:34:55 -0700
committerJens Axboe <axboe@kernel.dk>2012-09-09 10:35:38 +0200
commit395c72a707d966b36d5a42fe12c3a237ded3a0d9 (patch)
tree79e4450a4f31409815d80ee8e1a7e1490a140f22 /fs/bio.c
parenteeea3ac912207dcf759b95b2b4c36f96bce583bf (diff)
downloadlinux-395c72a707d966b36d5a42fe12c3a237ded3a0d9.tar.gz
block: Generalized bio pool freeing
With the old code, when you allocate a bio from a bio pool you have to implement your own destructor that knows how to find the bio pool the bio was originally allocated from. This adds a new field to struct bio (bi_pool) and changes bio_alloc_bioset() to use it. This makes various bio destructors unnecessary, so they're then deleted. v6: Explain the temporary if statement in bio_put Signed-off-by: Kent Overstreet <koverstreet@google.com> CC: Jens Axboe <axboe@kernel.dk> CC: NeilBrown <neilb@suse.de> CC: Alasdair Kergon <agk@redhat.com> CC: Nicholas Bellinger <nab@linux-iscsi.org> CC: Lars Ellenberg <lars.ellenberg@linbit.com> Acked-by: Tejun Heo <tj@kernel.org> Acked-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/bio.c')
-rw-r--r--fs/bio.c31
1 files changed, 13 insertions, 18 deletions
diff --git a/fs/bio.c b/fs/bio.c
index 71072ab9912..e017f7a5cdc 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -272,10 +272,6 @@ EXPORT_SYMBOL(bio_init);
* bio_alloc_bioset will try its own mempool to satisfy the allocation.
* If %__GFP_WAIT is set then we will block on the internal pool waiting
* for a &struct bio to become free.
- *
- * Note that the caller must set ->bi_destructor on successful return
- * of a bio, to do the appropriate freeing of the bio once the reference
- * count drops to zero.
**/
struct bio *bio_alloc_bioset(gfp_t gfp_mask, int nr_iovecs, struct bio_set *bs)
{
@@ -290,6 +286,7 @@ struct bio *bio_alloc_bioset(gfp_t gfp_mask, int nr_iovecs, struct bio_set *bs)
bio = p + bs->front_pad;
bio_init(bio);
+ bio->bi_pool = bs;
if (unlikely(!nr_iovecs))
goto out_set;
@@ -316,11 +313,6 @@ err_free:
}
EXPORT_SYMBOL(bio_alloc_bioset);
-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
@@ -342,12 +334,7 @@ static void bio_fs_destructor(struct bio *bio)
*/
struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs)
{
- struct bio *bio = bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set);
-
- if (bio)
- bio->bi_destructor = bio_fs_destructor;
-
- return bio;
+ return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set);
}
EXPORT_SYMBOL(bio_alloc);
@@ -423,7 +410,16 @@ void bio_put(struct bio *bio)
if (atomic_dec_and_test(&bio->bi_cnt)) {
bio_disassociate_task(bio);
bio->bi_next = NULL;
- bio->bi_destructor(bio);
+
+ /*
+ * This if statement is temporary - bi_pool is replacing
+ * bi_destructor, but bi_destructor will be taken out in another
+ * patch.
+ */
+ if (bio->bi_pool)
+ bio_free(bio, bio->bi_pool);
+ else
+ bio->bi_destructor(bio);
}
}
EXPORT_SYMBOL(bio_put);
@@ -474,12 +470,11 @@ EXPORT_SYMBOL(__bio_clone);
*/
struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)
{
- struct bio *b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs, fs_bio_set);
+ struct bio *b = bio_alloc(gfp_mask, bio->bi_max_vecs);
if (!b)
return NULL;
- b->bi_destructor = bio_fs_destructor;
__bio_clone(b, bio);
if (bio_integrity(bio)) {