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block: remove bio_clone() and all references. 

bio_clone() is no longer used.
Only bio_clone_bioset() or bio_clone_fast().
This is for the best, as bio_clone() used fs_bio_set,
and filesystems are unlikely to want to use bio_clone().

So remove bio_clone() and all references.
This includes a fix to some incorrect documentation.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
NeilBrown 2017-06-18 14:38:59 +10:00 committed by Jens Axboe
parent 5a136fdf5a
commit 9b10f6a9c2
5 changed files with 6 additions and 11 deletions
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2
Documentation/block/biodoc.txt
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@ -632,7 +632,7 @@ 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() routine may be used to duplicate a bio, where the clone
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.

2
block/bio.c
View File

@ -547,7 +547,7 @@ EXPORT_SYMBOL(zero_fill_bio);
*
* Description:
* Put a reference to a &struct bio, either one you have gotten with
* bio_alloc, bio_get or bio_clone. The last put of a bio will free it.
* bio_alloc, bio_get or bio_clone_*. The last put of a bio will free it.
**/
void bio_put(struct bio *bio)
{

6
block/blk-merge.c
View File

@ -115,13 +115,13 @@ static struct bio *blk_bio_segment_split(struct request_queue *q,
* With arbitrary bio size, the incoming bio may be very
* big. We have to split the bio into small bios so that
* each holds at most BIO_MAX_PAGES bvecs because
* bio_clone() can fail to allocate big bvecs.
* bio_clone_bioset() can fail to allocate big bvecs.
*
* Those drivers which will need to use bio_clone()
* Those drivers which will need to use bio_clone_bioset()
* should tell us in some way. For now, impose the
* BIO_MAX_PAGES limit on all queues.
*
* TODO: handle users of bio_clone() differently.
* TODO: handle users of bio_clone_bioset() differently.
*/
if (bvecs++ >= BIO_MAX_PAGES)
goto split;

2
drivers/md/md.c
View File

@ -185,7 +185,7 @@ static int start_readonly;
static bool create_on_open = true;
/* bio_clone_mddev
* like bio_clone, but with a local bio set
* like bio_clone_bioset, but with a local bio set
*/
struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,

5
include/linux/bio.h
View File

@ -395,11 +395,6 @@ static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs)
return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set);
}
static inline struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)
{
return bio_clone_bioset(bio, gfp_mask, fs_bio_set);
}
static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs)
{
return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL);