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block: Kill bio_pair_split() 

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Cc: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Kent Overstreet 2013-08-07 14:33:00 -07:00
parent 20d0189b10
commit 4b1faf9316
3 changed files with 0 additions and 165 deletions
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45
fs/bio-integrity.c
View File

@ -580,51 +580,6 @@ void bio_integrity_trim(struct bio *bio, unsigned int offset,
}
EXPORT_SYMBOL(bio_integrity_trim);
/**
* bio_integrity_split - Split integrity metadata
* @bio: Protected bio
* @bp: Resulting bio_pair
* @sectors: Offset
*
* Description: Splits an integrity page into a bio_pair.
*/
void bio_integrity_split(struct bio *bio, struct bio_pair *bp, int sectors)
{
struct blk_integrity *bi;
struct bio_integrity_payload *bip = bio->bi_integrity;
unsigned int nr_sectors;
if (bio_integrity(bio) == 0)
return;
bi = bdev_get_integrity(bio->bi_bdev);
BUG_ON(bi == NULL);
BUG_ON(bip->bip_vcnt != 1);
nr_sectors = bio_integrity_hw_sectors(bi, sectors);
bp->bio1.bi_integrity = &bp->bip1;
bp->bio2.bi_integrity = &bp->bip2;
bp->iv1 = bip->bip_vec[bip->bip_iter.bi_idx];
bp->iv2 = bip->bip_vec[bip->bip_iter.bi_idx];
bp->bip1.bip_vec = &bp->iv1;
bp->bip2.bip_vec = &bp->iv2;
bp->iv1.bv_len = sectors * bi->tuple_size;
bp->iv2.bv_offset += sectors * bi->tuple_size;
bp->iv2.bv_len -= sectors * bi->tuple_size;
bp->bip1.bip_iter.bi_sector = bio->bi_integrity->bip_iter.bi_sector;
bp->bip2.bip_iter.bi_sector =
bio->bi_integrity->bip_iter.bi_sector + nr_sectors;
bp->bip1.bip_vcnt = bp->bip2.bip_vcnt = 1;
bp->bip1.bip_iter.bi_idx = bp->bip2.bip_iter.bi_idx = 0;
}
EXPORT_SYMBOL(bio_integrity_split);
/**
* bio_integrity_clone - Callback for cloning bios with integrity metadata
* @bio: New bio

90
fs/bio.c
View File

@ -38,8 +38,6 @@
*/
#define BIO_INLINE_VECS 4
static mempool_t *bio_split_pool __read_mostly;
/*
* if you change this list, also change bvec_alloc or things will
* break badly! cannot be bigger than what you can fit into an
@ -1829,89 +1827,6 @@ struct bio *bio_split(struct bio *bio, int sectors,
}
EXPORT_SYMBOL(bio_split);
void bio_pair_release(struct bio_pair *bp)
{
if (atomic_dec_and_test(&bp->cnt)) {
struct bio *master = bp->bio1.bi_private;
bio_endio(master, bp->error);
mempool_free(bp, bp->bio2.bi_private);
}
}
EXPORT_SYMBOL(bio_pair_release);
static void bio_pair_end_1(struct bio *bi, int err)
{
struct bio_pair *bp = container_of(bi, struct bio_pair, bio1);
if (err)
bp->error = err;
bio_pair_release(bp);
}
static void bio_pair_end_2(struct bio *bi, int err)
{
struct bio_pair *bp = container_of(bi, struct bio_pair, bio2);
if (err)
bp->error = err;
bio_pair_release(bp);
}
/*
* split a bio - only worry about a bio with a single page in its iovec
*/
struct bio_pair *bio_pair_split(struct bio *bi, int first_sectors)
{
struct bio_pair *bp = mempool_alloc(bio_split_pool, GFP_NOIO);
if (!bp)
return bp;
trace_block_split(bdev_get_queue(bi->bi_bdev), bi,
bi->bi_iter.bi_sector + first_sectors);
BUG_ON(bio_multiple_segments(bi));
atomic_set(&bp->cnt, 3);
bp->error = 0;
bp->bio1 = *bi;
bp->bio2 = *bi;
bp->bio2.bi_iter.bi_sector += first_sectors;
bp->bio2.bi_iter.bi_size -= first_sectors << 9;
bp->bio1.bi_iter.bi_size = first_sectors << 9;
if (bi->bi_vcnt != 0) {
bp->bv1 = bio_iovec(bi);
bp->bv2 = bio_iovec(bi);
if (bio_is_rw(bi)) {
bp->bv2.bv_offset += first_sectors << 9;
bp->bv2.bv_len -= first_sectors << 9;
bp->bv1.bv_len = first_sectors << 9;
}
bp->bio1.bi_io_vec = &bp->bv1;
bp->bio2.bi_io_vec = &bp->bv2;
bp->bio1.bi_max_vecs = 1;
bp->bio2.bi_max_vecs = 1;
}
bp->bio1.bi_end_io = bio_pair_end_1;
bp->bio2.bi_end_io = bio_pair_end_2;
bp->bio1.bi_private = bi;
bp->bio2.bi_private = bio_split_pool;
if (bio_integrity(bi))
bio_integrity_split(bi, bp, first_sectors);
return bp;
}
EXPORT_SYMBOL(bio_pair_split);
/**
* bio_trim - trim a bio
* @bio: bio to trim
@ -2113,11 +2028,6 @@ static int __init init_bio(void)
if (bioset_integrity_create(fs_bio_set, BIO_POOL_SIZE))
panic("bio: can't create integrity pool\n");
bio_split_pool = mempool_create_kmalloc_pool(BIO_SPLIT_ENTRIES,
sizeof(struct bio_pair));
if (!bio_split_pool)
panic("bio: can't create split pool\n");
return 0;
}
subsys_initcall(init_bio);

30
include/linux/bio.h
View File

@ -297,30 +297,7 @@ struct bio_integrity_payload {
};
#endif /* CONFIG_BLK_DEV_INTEGRITY */
/*
* A bio_pair is used when we need to split a bio.
* This can only happen for a bio that refers to just one
* page of data, and in the unusual situation when the
* page crosses a chunk/device boundary
*
* The address of the master bio is stored in bio1.bi_private
* The address of the pool the pair was allocated from is stored
* in bio2.bi_private
*/
struct bio_pair {
struct bio bio1, bio2;
struct bio_vec bv1, bv2;
#if defined(CONFIG_BLK_DEV_INTEGRITY)
struct bio_integrity_payload bip1, bip2;
struct bio_vec iv1, iv2;
#endif
atomic_t cnt;
int error;
};
extern struct bio_pair *bio_pair_split(struct bio *bi, int first_sectors);
extern void bio_pair_release(struct bio_pair *dbio);
extern void bio_trim(struct bio *bio, int offset, int size);
extern struct bio *bio_split(struct bio *bio, int sectors,
gfp_t gfp, struct bio_set *bs);
@ -677,7 +654,6 @@ extern int bio_integrity_prep(struct bio *);
extern void bio_integrity_endio(struct bio *, int);
extern void bio_integrity_advance(struct bio *, unsigned int);
extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int);
extern void bio_integrity_split(struct bio *, struct bio_pair *, int);
extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t);
extern int bioset_integrity_create(struct bio_set *, int);
extern void bioset_integrity_free(struct bio_set *);
@ -721,12 +697,6 @@ static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
return 0;
}
static inline void bio_integrity_split(struct bio *bio, struct bio_pair *bp,
int sectors)
{
return;
}
static inline void bio_integrity_advance(struct bio *bio,
unsigned int bytes_done)
{