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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>
This commit is contained in:
Kent Overstreet 2012-09-06 15:34:55 -07:00 committed by Jens Axboe
parent eeea3ac912
commit 395c72a707
8 changed files with 21 additions and 103 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/block/drbd/drbd_main.c
View File

@ -162,23 +162,12 @@ static const struct block_device_operations drbd_ops = {
.release = drbd_release,
};
static void bio_destructor_drbd(struct bio *bio)
{
bio_free(bio, drbd_md_io_bio_set);
}
struct bio *bio_alloc_drbd(gfp_t gfp_mask)
{
struct bio *bio;
if (!drbd_md_io_bio_set)
return bio_alloc(gfp_mask, 1);
bio = bio_alloc_bioset(gfp_mask, 1, drbd_md_io_bio_set);
if (!bio)
return NULL;
bio->bi_destructor = bio_destructor_drbd;
return bio;
return bio_alloc_bioset(gfp_mask, 1, drbd_md_io_bio_set);
}
#ifdef __CHECKER__

9
drivers/md/dm-crypt.c
View File

@ -798,14 +798,6 @@ static int crypt_convert(struct crypt_config *cc,
return 0;
}
static void dm_crypt_bio_destructor(struct bio *bio)
{
struct dm_crypt_io *io = bio->bi_private;
struct crypt_config *cc = io->cc;
bio_free(bio, cc->bs);
}
/*
* Generate a new unfragmented bio with the given size
* This should never violate the device limitations
@ -974,7 +966,6 @@ static void clone_init(struct dm_crypt_io *io, struct bio *clone)
clone->bi_end_io = crypt_endio;
clone->bi_bdev = cc->dev->bdev;
clone->bi_rw = io->base_bio->bi_rw;
clone->bi_destructor = dm_crypt_bio_destructor;
}
static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp)

11
drivers/md/dm-io.c
View File

@ -249,16 +249,6 @@ static void vm_dp_init(struct dpages *dp, void *data)
dp->context_ptr = data;
}
static void dm_bio_destructor(struct bio *bio)
{
unsigned region;
struct io *io;
retrieve_io_and_region_from_bio(bio, &io, &region);
bio_free(bio, io->client->bios);
}
/*
* Functions for getting the pages from kernel memory.
*/
@ -317,7 +307,6 @@ static void do_region(int rw, unsigned region, struct dm_io_region *where,
bio->bi_sector = where->sector + (where->count - remaining);
bio->bi_bdev = where->bdev;
bio->bi_end_io = endio;
bio->bi_destructor = dm_bio_destructor;
store_io_and_region_in_bio(bio, io, region);
if (rw & REQ_DISCARD) {

20
drivers/md/dm.c
View File

@ -681,11 +681,6 @@ static void clone_endio(struct bio *bio, int error)
}
}
/*
* Store md for cleanup instead of tio which is about to get freed.
*/
bio->bi_private = md->bs;
free_tio(md, tio);
bio_put(bio);
dec_pending(io, error);
@ -1032,11 +1027,6 @@ static void __map_bio(struct dm_target *ti, struct bio *clone,
/* error the io and bail out, or requeue it if needed */
md = tio->io->md;
dec_pending(tio->io, r);
/*
* Store bio_set for cleanup.
*/
clone->bi_end_io = NULL;
clone->bi_private = md->bs;
bio_put(clone);
free_tio(md, tio);
} else if (r) {
@ -1055,13 +1045,6 @@ struct clone_info {
unsigned short idx;
};
static void dm_bio_destructor(struct bio *bio)
{
struct bio_set *bs = bio->bi_private;
bio_free(bio, bs);
}
/*
* Creates a little bio that just does part of a bvec.
*/
@ -1073,7 +1056,6 @@ static struct bio *split_bvec(struct bio *bio, sector_t sector,
struct bio_vec *bv = bio->bi_io_vec + idx;
clone = bio_alloc_bioset(GFP_NOIO, 1, bs);
clone->bi_destructor = dm_bio_destructor;
*clone->bi_io_vec = *bv;
clone->bi_sector = sector;
@ -1105,7 +1087,6 @@ static struct bio *clone_bio(struct bio *bio, sector_t sector,
clone = bio_alloc_bioset(GFP_NOIO, bio->bi_max_vecs, bs);
__bio_clone(clone, bio);
clone->bi_destructor = dm_bio_destructor;
clone->bi_sector = sector;
clone->bi_idx = idx;
clone->bi_vcnt = idx + bv_count;
@ -1150,7 +1131,6 @@ static void __issue_target_request(struct clone_info *ci, struct dm_target *ti,
*/
clone = bio_alloc_bioset(GFP_NOIO, ci->bio->bi_max_vecs, ci->md->bs);
__bio_clone(clone, ci->bio);
clone->bi_destructor = dm_bio_destructor;
if (len) {
clone->bi_sector = ci->sector;
clone->bi_size = to_bytes(len);

28
drivers/md/md.c
View File

@ -155,32 +155,17 @@ static int start_readonly;
* like bio_clone, but with a local bio set
*/
static void mddev_bio_destructor(struct bio *bio)
{
struct mddev *mddev, **mddevp;
mddevp = (void*)bio;
mddev = mddevp[-1];
bio_free(bio, mddev->bio_set);
}
struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
struct mddev *mddev)
{
struct bio *b;
struct mddev **mddevp;
if (!mddev || !mddev->bio_set)
return bio_alloc(gfp_mask, nr_iovecs);
b = bio_alloc_bioset(gfp_mask, nr_iovecs,
mddev->bio_set);
b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set);
if (!b)
return NULL;
mddevp = (void*)b;
mddevp[-1] = mddev;
b->bi_destructor = mddev_bio_destructor;
return b;
}
EXPORT_SYMBOL_GPL(bio_alloc_mddev);
@ -189,18 +174,14 @@ struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
struct mddev *mddev)
{
struct bio *b;
struct mddev **mddevp;
if (!mddev || !mddev->bio_set)
return bio_clone(bio, gfp_mask);
b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs,
mddev->bio_set);
b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs, mddev->bio_set);
if (!b)
return NULL;
mddevp = (void*)b;
mddevp[-1] = mddev;
b->bi_destructor = mddev_bio_destructor;
__bio_clone(b, bio);
if (bio_integrity(bio)) {
int ret;
@ -5006,8 +4987,7 @@ int md_run(struct mddev *mddev)
}
if (mddev->bio_set == NULL)
mddev->bio_set = bioset_create(BIO_POOL_SIZE,
sizeof(struct mddev *));
mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
spin_lock(&pers_lock);
pers = find_pers(mddev->level, mddev->clevel);

9
drivers/target/target_core_iblock.c
View File

@ -543,14 +543,6 @@ static void iblock_complete_cmd(struct se_cmd *cmd)
kfree(ibr);
}
static void iblock_bio_destructor(struct bio *bio)
{
struct se_cmd *cmd = bio->bi_private;
struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr;
bio_free(bio, ib_dev->ibd_bio_set);
}
static struct bio *
iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num)
{
@ -572,7 +564,6 @@ iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num)
bio->bi_bdev = ib_dev->ibd_bd;
bio->bi_private = cmd;
bio->bi_destructor = iblock_bio_destructor;
bio->bi_end_io = &iblock_bio_done;
bio->bi_sector = lba;
return bio;

31
fs/bio.c
View File

@ -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)) {

3
include/linux/blk_types.h
View File

@ -80,6 +80,9 @@ struct bio {
struct bio_integrity_payload *bi_integrity; /* data integrity */
#endif
/* If bi_pool is non NULL, bi_destructor is not called */
struct bio_set *bi_pool;
bio_destructor_t *bi_destructor; /* destructor */
/*