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block: pass a block_device to bio_clone_fast 

Pass a block_device to bio_clone_fast and __bio_clone_fast and give
the functions more suitable names.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Link: https://lore.kernel.org/r/20220202160109.108149-14-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2022-02-02 17:01:09 +01:00 committed by Jens Axboe
parent a0e8de798d
commit abfc426d1b
20 changed files with 80 additions and 80 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
Documentation/block/biodoc.rst
View File

@ -663,11 +663,6 @@ to i/o submission, if the bio fields are likely to be accessed after the
i/o is issued (since the bio may otherwise get freed in case i/o completion
happens in the meantime).
The bio_clone_fast() routine may be used to duplicate a bio, where the clone
shares the bio_vec_list with the original bio (i.e. both point to the
same bio_vec_list). This would typically be used for splitting i/o requests
in lvm or md.
3.2 Generic bio helper Routines
-------------------------------

31
block/bio.c
View File

@ -733,7 +733,8 @@ static int __bio_clone(struct bio *bio, struct bio *bio_src, gfp_t gfp)
bio_set_flag(bio, BIO_CLONED);
if (bio_flagged(bio_src, BIO_THROTTLED))
bio_set_flag(bio, BIO_THROTTLED);
if (bio_flagged(bio_src, BIO_REMAPPED))
if (bio->bi_bdev == bio_src->bi_bdev &&
bio_flagged(bio_src, BIO_REMAPPED))
bio_set_flag(bio, BIO_REMAPPED);
bio->bi_ioprio = bio_src->bi_ioprio;
bio->bi_write_hint = bio_src->bi_write_hint;
@ -751,7 +752,8 @@ static int __bio_clone(struct bio *bio, struct bio *bio_src, gfp_t gfp)
}
/**
* bio_clone_fast - clone a bio that shares the original bio's biovec
* bio_alloc_clone - clone a bio that shares the original bio's biovec
* @bdev: block_device to clone onto
* @bio_src: bio to clone from
* @gfp: allocation priority
* @bs: bio_set to allocate from
@ -761,11 +763,12 @@ static int __bio_clone(struct bio *bio, struct bio *bio_src, gfp_t gfp)
*
* The caller must ensure that the return bio is not freed before @bio_src.
*/
struct bio *bio_clone_fast(struct bio *bio_src, gfp_t gfp, struct bio_set *bs)
struct bio *bio_alloc_clone(struct block_device *bdev, struct bio *bio_src,
gfp_t gfp, struct bio_set *bs)
{
struct bio *bio;
bio = bio_alloc_bioset(bio_src->bi_bdev, 0, bio_src->bi_opf, gfp, bs);
bio = bio_alloc_bioset(bdev, 0, bio_src->bi_opf, gfp, bs);
if (!bio)
return NULL;
@ -777,10 +780,11 @@ struct bio *bio_clone_fast(struct bio *bio_src, gfp_t gfp, struct bio_set *bs)
return bio;
}
EXPORT_SYMBOL(bio_clone_fast);
EXPORT_SYMBOL(bio_alloc_clone);
/**
* __bio_clone_fast - clone a bio that shares the original bio's biovec
* bio_init_clone - clone a bio that shares the original bio's biovec
* @bdev: block_device to clone onto
* @bio: bio to clone into
* @bio_src: bio to clone from
* @gfp: allocation priority
@ -790,17 +794,18 @@ EXPORT_SYMBOL(bio_clone_fast);
*
* The caller must ensure that @bio_src is not freed before @bio.
*/
int __bio_clone_fast(struct bio *bio, struct bio *bio_src, gfp_t gfp)
int bio_init_clone(struct block_device *bdev, struct bio *bio,
struct bio *bio_src, gfp_t gfp)
{
int ret;
bio_init(bio, bio_src->bi_bdev, bio_src->bi_io_vec, 0, bio_src->bi_opf);
bio_init(bio, bdev, bio_src->bi_io_vec, 0, bio_src->bi_opf);
ret = __bio_clone(bio, bio_src, gfp);
if (ret)
bio_uninit(bio);
return ret;
}
EXPORT_SYMBOL(__bio_clone_fast);
EXPORT_SYMBOL(bio_init_clone);
const char *bio_devname(struct bio *bio, char *buf)
{
@ -1572,7 +1577,7 @@ struct bio *bio_split(struct bio *bio, int sectors,
if (WARN_ON_ONCE(bio_op(bio) == REQ_OP_ZONE_APPEND))
return NULL;
split = bio_clone_fast(bio, gfp, bs);
split = bio_alloc_clone(bio->bi_bdev, bio, gfp, bs);
if (!split)
return NULL;
@ -1667,9 +1672,9 @@ EXPORT_SYMBOL(bioset_exit);
* Note that the bio must be embedded at the END of that structure always,
* or things will break badly.
* If %BIOSET_NEED_BVECS is set in @flags, a separate pool will be allocated
* for allocating iovecs. This pool is not needed e.g. for bio_clone_fast().
* If %BIOSET_NEED_RESCUER is set, a workqueue is created which can be used to
* dispatch queued requests when the mempool runs out of space.
* for allocating iovecs. This pool is not needed e.g. for bio_init_clone().
* If %BIOSET_NEED_RESCUER is set, a workqueue is created which can be used
* to dispatch queued requests when the mempool runs out of space.
*
*/
int bioset_init(struct bio_set *bs,

4
block/blk-mq.c
View File

@ -2975,10 +2975,10 @@ int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
bs = &fs_bio_set;
__rq_for_each_bio(bio_src, rq_src) {
bio = bio_clone_fast(bio_src, gfp_mask, bs);
bio = bio_alloc_clone(rq->q->disk->part0, bio_src, gfp_mask,
bs);
if (!bio)
goto free_and_out;
bio->bi_bdev = rq->q->disk->part0;
if (bio_ctr && bio_ctr(bio, bio_src, data))
goto free_and_out;

3
block/bounce.c
View File

@ -162,8 +162,7 @@ static struct bio *bounce_clone_bio(struct bio *bio_src)
* that does not own the bio - reason being drivers don't use it for
* iterating over the biovec anymore, so expecting it to be kept up
* to date (i.e. for clones that share the parent biovec) is just
* asking for trouble and would force extra work on
* __bio_clone_fast() anyways.
* asking for trouble and would force extra work.
*/
bio = bio_alloc_bioset(bio_src->bi_bdev, bio_segments(bio_src),
bio_src->bi_opf, GFP_NOIO, &bounce_bio_set);

4
drivers/block/drbd/drbd_req.c
View File

@ -30,8 +30,8 @@ static struct drbd_request *drbd_req_new(struct drbd_device *device, struct bio
return NULL;
memset(req, 0, sizeof(*req));
req->private_bio = bio_clone_fast(bio_src, GFP_NOIO, &drbd_io_bio_set);
bio_set_dev(req->private_bio, device->ldev->backing_bdev);
req->private_bio = bio_alloc_clone(device->ldev->backing_bdev, bio_src,
GFP_NOIO, &drbd_io_bio_set);
req->private_bio->bi_private = req;
req->private_bio->bi_end_io = drbd_request_endio;

4
drivers/block/drbd/drbd_worker.c
View File

@ -1523,9 +1523,9 @@ int w_restart_disk_io(struct drbd_work *w, int cancel)
if (bio_data_dir(req->master_bio) == WRITE && req->rq_state & RQ_IN_ACT_LOG)
drbd_al_begin_io(device, &req->i);
req->private_bio = bio_clone_fast(req->master_bio, GFP_NOIO,
req->private_bio = bio_alloc_clone(device->ldev->backing_bdev,
req->master_bio, GFP_NOIO,
&drbd_io_bio_set);
bio_set_dev(req->private_bio, device->ldev->backing_bdev);
req->private_bio->bi_private = req;
req->private_bio->bi_end_io = drbd_request_endio;
submit_bio_noacct(req->private_bio);

4
drivers/block/pktcdvd.c
View File

@ -2294,12 +2294,12 @@ static void pkt_end_io_read_cloned(struct bio *bio)
static void pkt_make_request_read(struct pktcdvd_device *pd, struct bio *bio)
{
struct bio *cloned_bio = bio_clone_fast(bio, GFP_NOIO, &pkt_bio_set);
struct bio *cloned_bio =
bio_alloc_clone(pd->bdev, bio, GFP_NOIO, &pkt_bio_set);
struct packet_stacked_data *psd = mempool_alloc(&psd_pool, GFP_NOIO);
psd->pd = pd;
psd->bio = bio;
bio_set_dev(cloned_bio, pd->bdev);
cloned_bio->bi_private = psd;
cloned_bio->bi_end_io = pkt_end_io_read_cloned;
pd->stats.secs_r += bio_sectors(bio);

5
drivers/md/bcache/request.c
View File

@ -685,7 +685,7 @@ static void do_bio_hook(struct search *s,
{
struct bio *bio = &s->bio.bio;
__bio_clone_fast(bio, orig_bio, GFP_NOIO);
bio_init_clone(bio->bi_bdev, bio, orig_bio, GFP_NOIO);
/*
* bi_end_io can be set separately somewhere else, e.g. the
* variants in,
@ -1036,7 +1036,8 @@ static void cached_dev_write(struct cached_dev *dc, struct search *s)
closure_bio_submit(s->iop.c, flush, cl);
}
} else {
s->iop.bio = bio_clone_fast(bio, GFP_NOIO, &dc->disk.bio_split);
s->iop.bio = bio_alloc_clone(bio->bi_bdev, bio, GFP_NOIO,
&dc->disk.bio_split);
/* I/O request sent to backing device */
bio->bi_end_io = backing_request_endio;
closure_bio_submit(s->iop.c, bio, cl);

4
drivers/md/dm-cache-target.c
View File

@ -819,13 +819,13 @@ static void issue_op(struct bio *bio, void *context)
static void remap_to_origin_and_cache(struct cache *cache, struct bio *bio,
dm_oblock_t oblock, dm_cblock_t cblock)
{
struct bio *origin_bio = bio_clone_fast(bio, GFP_NOIO, &cache->bs);
struct bio *origin_bio = bio_alloc_clone(cache->origin_dev->bdev, bio,
GFP_NOIO, &cache->bs);
BUG_ON(!origin_bio);
bio_chain(origin_bio, bio);
remap_to_origin(cache, origin_bio);
if (bio_data_dir(origin_bio) == WRITE)
clear_discard(cache, oblock_to_dblock(cache, oblock));
submit_bio(origin_bio);

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

@ -1834,17 +1834,16 @@ static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp)
struct bio *clone;
/*
* We need the original biovec array in order to decrypt
* the whole bio data *afterwards* -- thanks to immutable
* biovecs we don't need to worry about the block layer
* modifying the biovec array; so leverage bio_clone_fast().
* We need the original biovec array in order to decrypt the whole bio
* data *afterwards* -- thanks to immutable biovecs we don't need to
* worry about the block layer modifying the biovec array; so leverage
* bio_alloc_clone().
*/
clone = bio_clone_fast(io->base_bio, gfp, &cc->bs);
clone = bio_alloc_clone(cc->dev->bdev, io->base_bio, gfp, &cc->bs);
if (!clone)
return 1;
clone->bi_private = io;
clone->bi_end_io = crypt_endio;
bio_set_dev(clone, cc->dev->bdev);
crypt_inc_pending(io);

3
drivers/md/dm-zoned-target.c
View File

@ -125,11 +125,10 @@ static int dmz_submit_bio(struct dmz_target *dmz, struct dm_zone *zone,
if (dev->flags & DMZ_BDEV_DYING)
return -EIO;
clone = bio_clone_fast(bio, GFP_NOIO, &dmz->bio_set);
clone = bio_alloc_clone(dev->bdev, bio, GFP_NOIO, &dmz->bio_set);
if (!clone)
return -ENOMEM;
bio_set_dev(clone, dev->bdev);
bioctx->dev = dev;
clone->bi_iter.bi_sector =
dmz_start_sect(dmz->metadata, zone) + dmz_blk2sect(chunk_block);

6
drivers/md/dm.c
View File

@ -520,7 +520,7 @@ static struct dm_io *alloc_io(struct mapped_device *md, struct bio *bio)
struct dm_target_io *tio;
struct bio *clone;
clone = bio_clone_fast(bio, GFP_NOIO, &md->io_bs);
clone = bio_alloc_clone(bio->bi_bdev, bio, GFP_NOIO, &md->io_bs);
tio = clone_to_tio(clone);
tio->inside_dm_io = true;
@ -553,8 +553,8 @@ static struct bio *alloc_tio(struct clone_info *ci, struct dm_target *ti,
/* the dm_target_io embedded in ci->io is available */
tio = &ci->io->tio;
} else {
struct bio *clone = bio_clone_fast(ci->bio, gfp_mask,
&ci->io->md->bs);
struct bio *clone = bio_alloc_clone(ci->bio->bi_bdev, ci->bio,
gfp_mask, &ci->io->md->bs);
if (!clone)
return NULL;

4
drivers/md/md-faulty.c
View File

@ -205,9 +205,9 @@ static bool faulty_make_request(struct mddev *mddev, struct bio *bio)
}
}
if (failit) {
struct bio *b = bio_clone_fast(bio, GFP_NOIO, &mddev->bio_set);
struct bio *b = bio_alloc_clone(conf->rdev->bdev, bio, GFP_NOIO,
&mddev->bio_set);
bio_set_dev(b, conf->rdev->bdev);
b->bi_private = bio;
b->bi_end_io = faulty_fail;
bio = b;

3
drivers/md/md-multipath.c
View File

@ -121,10 +121,9 @@ static bool multipath_make_request(struct mddev *mddev, struct bio * bio)
}
multipath = conf->multipaths + mp_bh->path;
__bio_clone_fast(&mp_bh->bio, bio, GFP_NOIO);
bio_init_clone(multipath->rdev->bdev, &mp_bh->bio, bio, GFP_NOIO);
mp_bh->bio.bi_iter.bi_sector += multipath->rdev->data_offset;
bio_set_dev(&mp_bh->bio, multipath->rdev->bdev);
mp_bh->bio.bi_opf |= REQ_FAILFAST_TRANSPORT;
mp_bh->bio.bi_end_io = multipath_end_request;
mp_bh->bio.bi_private = mp_bh;

5
drivers/md/md.c
View File

@ -8634,13 +8634,14 @@ static void md_end_io_acct(struct bio *bio)
*/
void md_account_bio(struct mddev *mddev, struct bio **bio)
{
struct block_device *bdev = (*bio)->bi_bdev;
struct md_io_acct *md_io_acct;
struct bio *clone;
if (!blk_queue_io_stat((*bio)->bi_bdev->bd_disk->queue))
if (!blk_queue_io_stat(bdev->bd_disk->queue))
return;
clone = bio_clone_fast(*bio, GFP_NOIO, &mddev->io_acct_set);
clone = bio_alloc_clone(bdev, *bio, GFP_NOIO, &mddev->io_acct_set);
md_io_acct = container_of(clone, struct md_io_acct, bio_clone);
md_io_acct->orig_bio = *bio;
md_io_acct->start_time = bio_start_io_acct(*bio);

34
drivers/md/raid1.c
View File

@ -1320,13 +1320,13 @@ static void raid1_read_request(struct mddev *mddev, struct bio *bio,
if (!r1bio_existed && blk_queue_io_stat(bio->bi_bdev->bd_disk->queue))
r1_bio->start_time = bio_start_io_acct(bio);
read_bio = bio_clone_fast(bio, gfp, &mddev->bio_set);
read_bio = bio_alloc_clone(mirror->rdev->bdev, bio, gfp,
&mddev->bio_set);
r1_bio->bios[rdisk] = read_bio;
read_bio->bi_iter.bi_sector = r1_bio->sector +
mirror->rdev->data_offset;
bio_set_dev(read_bio, mirror->rdev->bdev);
read_bio->bi_end_io = raid1_end_read_request;
bio_set_op_attrs(read_bio, op, do_sync);
if (test_bit(FailFast, &mirror->rdev->flags) &&
@ -1546,24 +1546,25 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
first_clone = 0;
}
if (r1_bio->behind_master_bio)
mbio = bio_clone_fast(r1_bio->behind_master_bio,
GFP_NOIO, &mddev->bio_set);
else
mbio = bio_clone_fast(bio, GFP_NOIO, &mddev->bio_set);
if (r1_bio->behind_master_bio) {
mbio = bio_alloc_clone(rdev->bdev,
r1_bio->behind_master_bio,
GFP_NOIO, &mddev->bio_set);
if (test_bit(CollisionCheck, &rdev->flags))
wait_for_serialization(rdev, r1_bio);
if (test_bit(WriteMostly, &rdev->flags))
atomic_inc(&r1_bio->behind_remaining);
} else if (mddev->serialize_policy)
wait_for_serialization(rdev, r1_bio);
} else {
mbio = bio_alloc_clone(rdev->bdev, bio, GFP_NOIO,
&mddev->bio_set);
if (mddev->serialize_policy)
wait_for_serialization(rdev, r1_bio);
}
r1_bio->bios[i] = mbio;
mbio->bi_iter.bi_sector = (r1_bio->sector + rdev->data_offset);
bio_set_dev(mbio, rdev->bdev);
mbio->bi_end_io = raid1_end_write_request;
mbio->bi_opf = bio_op(bio) | (bio->bi_opf & (REQ_SYNC | REQ_FUA));
if (test_bit(FailFast, &rdev->flags) &&
@ -2416,12 +2417,12 @@ static int narrow_write_error(struct r1bio *r1_bio, int i)
/* Write at 'sector' for 'sectors'*/
if (test_bit(R1BIO_BehindIO, &r1_bio->state)) {
wbio = bio_clone_fast(r1_bio->behind_master_bio,
GFP_NOIO,
&mddev->bio_set);
wbio = bio_alloc_clone(rdev->bdev,
r1_bio->behind_master_bio,
GFP_NOIO, &mddev->bio_set);
} else {
wbio = bio_clone_fast(r1_bio->master_bio, GFP_NOIO,
&mddev->bio_set);
wbio = bio_alloc_clone(rdev->bdev, r1_bio->master_bio,
GFP_NOIO, &mddev->bio_set);
}
bio_set_op_attrs(wbio, REQ_OP_WRITE, 0);
@ -2430,7 +2431,6 @@ static int narrow_write_error(struct r1bio *r1_bio, int i)
bio_trim(wbio, sector - r1_bio->sector, sectors);
wbio->bi_iter.bi_sector += rdev->data_offset;
bio_set_dev(wbio, rdev->bdev);
if (submit_bio_wait(wbio) < 0)
/* failure! */

16
drivers/md/raid10.c
View File

@ -1208,14 +1208,13 @@ static void raid10_read_request(struct mddev *mddev, struct bio *bio,
if (blk_queue_io_stat(bio->bi_bdev->bd_disk->queue))
r10_bio->start_time = bio_start_io_acct(bio);
read_bio = bio_clone_fast(bio, gfp, &mddev->bio_set);
read_bio = bio_alloc_clone(rdev->bdev, bio, gfp, &mddev->bio_set);
r10_bio->devs[slot].bio = read_bio;
r10_bio->devs[slot].rdev = rdev;
read_bio->bi_iter.bi_sector = r10_bio->devs[slot].addr +
choose_data_offset(r10_bio, rdev);
bio_set_dev(read_bio, rdev->bdev);
read_bio->bi_end_io = raid10_end_read_request;
bio_set_op_attrs(read_bio, op, do_sync);
if (test_bit(FailFast, &rdev->flags) &&
@ -1255,7 +1254,7 @@ static void raid10_write_one_disk(struct mddev *mddev, struct r10bio *r10_bio,
} else
rdev = conf->mirrors[devnum].rdev;
mbio = bio_clone_fast(bio, GFP_NOIO, &mddev->bio_set);
mbio = bio_alloc_clone(rdev->bdev, bio, GFP_NOIO, &mddev->bio_set);
if (replacement)
r10_bio->devs[n_copy].repl_bio = mbio;
else
@ -1263,7 +1262,6 @@ static void raid10_write_one_disk(struct mddev *mddev, struct r10bio *r10_bio,
mbio->bi_iter.bi_sector = (r10_bio->devs[n_copy].addr +
choose_data_offset(r10_bio, rdev));
bio_set_dev(mbio, rdev->bdev);
mbio->bi_end_io = raid10_end_write_request;
bio_set_op_attrs(mbio, op, do_sync | do_fua);
if (!replacement && test_bit(FailFast,
@ -1812,7 +1810,8 @@ retry_discard:
*/
if (r10_bio->devs[disk].bio) {
struct md_rdev *rdev = conf->mirrors[disk].rdev;
mbio = bio_clone_fast(bio, GFP_NOIO, &mddev->bio_set);
mbio = bio_alloc_clone(bio->bi_bdev, bio, GFP_NOIO,
&mddev->bio_set);
mbio->bi_end_io = raid10_end_discard_request;
mbio->bi_private = r10_bio;
r10_bio->devs[disk].bio = mbio;
@ -1825,7 +1824,8 @@ retry_discard:
}
if (r10_bio->devs[disk].repl_bio) {
struct md_rdev *rrdev = conf->mirrors[disk].replacement;
rbio = bio_clone_fast(bio, GFP_NOIO, &mddev->bio_set);
rbio = bio_alloc_clone(bio->bi_bdev, bio, GFP_NOIO,
&mddev->bio_set);
rbio->bi_end_io = raid10_end_discard_request;
rbio->bi_private = r10_bio;
r10_bio->devs[disk].repl_bio = rbio;
@ -2892,12 +2892,12 @@ static int narrow_write_error(struct r10bio *r10_bio, int i)
if (sectors > sect_to_write)
sectors = sect_to_write;
/* Write at 'sector' for 'sectors' */
wbio = bio_clone_fast(bio, GFP_NOIO, &mddev->bio_set);
wbio = bio_alloc_clone(rdev->bdev, bio, GFP_NOIO,
&mddev->bio_set);
bio_trim(wbio, sector - bio->bi_iter.bi_sector, sectors);
wsector = r10_bio->devs[i].addr + (sector - r10_bio->sector);
wbio->bi_iter.bi_sector = wsector +
choose_data_offset(r10_bio, rdev);
bio_set_dev(wbio, rdev->bdev);
bio_set_op_attrs(wbio, REQ_OP_WRITE, 0);
if (submit_bio_wait(wbio) < 0)

4
drivers/md/raid5.c
View File

@ -5438,14 +5438,14 @@ static int raid5_read_one_chunk(struct mddev *mddev, struct bio *raid_bio)
return 0;
}
align_bio = bio_clone_fast(raid_bio, GFP_NOIO, &mddev->io_acct_set);
align_bio = bio_alloc_clone(rdev->bdev, raid_bio, GFP_NOIO,
&mddev->io_acct_set);
md_io_acct = container_of(align_bio, struct md_io_acct, bio_clone);
raid_bio->bi_next = (void *)rdev;
if (blk_queue_io_stat(raid_bio->bi_bdev->bd_disk->queue))
md_io_acct->start_time = bio_start_io_acct(raid_bio);
md_io_acct->orig_bio = raid_bio;
bio_set_dev(align_bio, rdev->bdev);
align_bio->bi_end_io = raid5_align_endio;
align_bio->bi_private = md_io_acct;
align_bio->bi_iter.bi_sector = sector;

4
fs/btrfs/extent_io.c
View File

@ -3154,7 +3154,7 @@ struct bio *btrfs_bio_clone(struct bio *bio)
struct bio *new;
/* Bio allocation backed by a bioset does not fail */
new = bio_clone_fast(bio, GFP_NOFS, &btrfs_bioset);
new = bio_alloc_clone(bio->bi_bdev, bio, GFP_NOFS, &btrfs_bioset);
bbio = btrfs_bio(new);
btrfs_bio_init(bbio);
bbio->iter = bio->bi_iter;
@ -3169,7 +3169,7 @@ struct bio *btrfs_bio_clone_partial(struct bio *orig, u64 offset, u64 size)
ASSERT(offset <= UINT_MAX && size <= UINT_MAX);
/* this will never fail when it's backed by a bioset */
bio = bio_clone_fast(orig, GFP_NOFS, &btrfs_bioset);
bio = bio_alloc_clone(orig->bi_bdev, orig, GFP_NOFS, &btrfs_bioset);
ASSERT(bio);
bbio = btrfs_bio(bio);

6
include/linux/bio.h
View File

@ -413,8 +413,10 @@ struct bio *bio_alloc_kiocb(struct kiocb *kiocb, struct block_device *bdev,
struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned short nr_iovecs);
extern void bio_put(struct bio *);
int __bio_clone_fast(struct bio *bio, struct bio *bio_src, gfp_t gfp);
extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *);
struct bio *bio_alloc_clone(struct block_device *bdev, struct bio *bio_src,
gfp_t gfp, struct bio_set *bs);
int bio_init_clone(struct block_device *bdev, struct bio *bio,
struct bio *bio_src, gfp_t gfp);
extern struct bio_set fs_bio_set;