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block: move bio_alloc_pages() to bcache 

bcache is the only user of bio_alloc_pages(), so move this function into
bcache, and avoid it being misused in the future.

Also rename it to bch_bio_allo_pages() since it is bcache only.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2017-12-18 20:22:10 +08:00 committed by Jens Axboe
parent c2421edf5f
commit 25d8be77e1
9 changed files with 33 additions and 34 deletions
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28
block/bio.c
View File

@ -968,34 +968,6 @@ void bio_advance(struct bio *bio, unsigned bytes)
}
EXPORT_SYMBOL(bio_advance);
/**
* bio_alloc_pages - allocates a single page for each bvec in a bio
* @bio: bio to allocate pages for
* @gfp_mask: flags for allocation
*
* Allocates pages up to @bio->bi_vcnt.
*
* Returns 0 on success, -ENOMEM on failure. On failure, any allocated pages are
* freed.
*/
int bio_alloc_pages(struct bio *bio, gfp_t gfp_mask)
{
int i;
struct bio_vec *bv;
bio_for_each_segment_all(bv, bio, i) {
bv->bv_page = alloc_page(gfp_mask);
if (!bv->bv_page) {
while (--bv >= bio->bi_io_vec)
__free_page(bv->bv_page);
return -ENOMEM;
}
}
return 0;
}
EXPORT_SYMBOL(bio_alloc_pages);
/**
* bio_copy_data - copy contents of data buffers from one chain of bios to
* another

2
drivers/md/bcache/btree.c
View File

@ -419,7 +419,7 @@ static void do_btree_node_write(struct btree *b)
SET_PTR_OFFSET(&k.key, 0, PTR_OFFSET(&k.key, 0) +
bset_sector_offset(&b->keys, i));
if (!bio_alloc_pages(b->bio, __GFP_NOWARN|GFP_NOWAIT)) {
if (!bch_bio_alloc_pages(b->bio, __GFP_NOWARN|GFP_NOWAIT)) {
int j;
struct bio_vec *bv;
void *base = (void *) ((unsigned long) i & ~(PAGE_SIZE - 1));

2
drivers/md/bcache/debug.c
View File

@ -116,7 +116,7 @@ void bch_data_verify(struct cached_dev *dc, struct bio *bio)
return;
check->bi_opf = REQ_OP_READ;
if (bio_alloc_pages(check, GFP_NOIO))
if (bch_bio_alloc_pages(check, GFP_NOIO))
goto out_put;
submit_bio_wait(check);

2
drivers/md/bcache/movinggc.c
View File

@ -162,7 +162,7 @@ static void read_moving(struct cache_set *c)
bio_set_op_attrs(bio, REQ_OP_READ, 0);
bio->bi_end_io = read_moving_endio;
if (bio_alloc_pages(bio, GFP_KERNEL))
if (bch_bio_alloc_pages(bio, GFP_KERNEL))
goto err;
trace_bcache_gc_copy(&w->key);

2
drivers/md/bcache/request.c
View File

@ -841,7 +841,7 @@ static int cached_dev_cache_miss(struct btree *b, struct search *s,
cache_bio->bi_private = &s->cl;
bch_bio_map(cache_bio, NULL);
if (bio_alloc_pages(cache_bio, __GFP_NOWARN|GFP_NOIO))
if (bch_bio_alloc_pages(cache_bio, __GFP_NOWARN|GFP_NOIO))
goto out_put;
if (reada)

27
drivers/md/bcache/util.c
View File

@ -283,6 +283,33 @@ start: bv->bv_len = min_t(size_t, PAGE_SIZE - bv->bv_offset,
}
}
/**
* bch_bio_alloc_pages - allocates a single page for each bvec in a bio
* @bio: bio to allocate pages for
* @gfp_mask: flags for allocation
*
* Allocates pages up to @bio->bi_vcnt.
*
* Returns 0 on success, -ENOMEM on failure. On failure, any allocated pages are
* freed.
*/
int bch_bio_alloc_pages(struct bio *bio, gfp_t gfp_mask)
{
int i;
struct bio_vec *bv;
bio_for_each_segment_all(bv, bio, i) {
bv->bv_page = alloc_page(gfp_mask);
if (!bv->bv_page) {
while (--bv >= bio->bi_io_vec)
__free_page(bv->bv_page);
return -ENOMEM;
}
}
return 0;
}
/*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group (Any
* use permitted, subject to terms of PostgreSQL license; see.)

1
drivers/md/bcache/util.h
View File

@ -558,6 +558,7 @@ static inline unsigned fract_exp_two(unsigned x, unsigned fract_bits)
}
void bch_bio_map(struct bio *bio, void *base);
int bch_bio_alloc_pages(struct bio *bio, gfp_t gfp_mask);
static inline sector_t bdev_sectors(struct block_device *bdev)
{

2
drivers/md/bcache/writeback.c
View File

@ -278,7 +278,7 @@ static void read_dirty(struct cached_dev *dc)
bio_set_dev(&io->bio, PTR_CACHE(dc->disk.c, &w->key, 0)->bdev);
io->bio.bi_end_io = read_dirty_endio;
if (bio_alloc_pages(&io->bio, GFP_KERNEL))
if (bch_bio_alloc_pages(&io->bio, GFP_KERNEL))
goto err_free;
trace_bcache_writeback(&w->key);

1
include/linux/bio.h
View File

@ -500,7 +500,6 @@ static inline void bio_flush_dcache_pages(struct bio *bi)
#endif
extern void bio_copy_data(struct bio *dst, struct bio *src);
extern int bio_alloc_pages(struct bio *bio, gfp_t gfp);
extern void bio_free_pages(struct bio *bio);
extern struct bio *bio_copy_user_iov(struct request_queue *,