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block: add bio_add_zone_append_page 

Add bio_add_zone_append_page(), a wrapper around bio_add_hw_page() which
is intended to be used by file systems that directly add pages to a bio
instead of using bio_iov_iter_get_pages().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Acked-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn 2021-02-04 19:21:40 +09:00 committed by David Sterba
parent 72c9925f87
commit ae29333fa6
2 changed files with 35 additions and 0 deletions
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33
block/bio.c
View File

@ -851,6 +851,39 @@ int bio_add_pc_page(struct request_queue *q, struct bio *bio,
}
EXPORT_SYMBOL(bio_add_pc_page);
/**
* bio_add_zone_append_page - attempt to add page to zone-append bio
* @bio: destination bio
* @page: page to add
* @len: vec entry length
* @offset: vec entry offset
*
* Attempt to add a page to the bio_vec maplist of a bio that will be submitted
* for a zone-append request. This can fail for a number of reasons, such as the
* bio being full or the target block device is not a zoned block device or
* other limitations of the target block device. The target block device must
* allow bio's up to PAGE_SIZE, so it is always possible to add a single page
* to an empty bio.
*
* Returns: number of bytes added to the bio, or 0 in case of a failure.
*/
int bio_add_zone_append_page(struct bio *bio, struct page *page,
unsigned int len, unsigned int offset)
{
struct request_queue *q = bio->bi_disk->queue;
bool same_page = false;
if (WARN_ON_ONCE(bio_op(bio) != REQ_OP_ZONE_APPEND))
return 0;
if (WARN_ON_ONCE(!blk_queue_is_zoned(q)))
return 0;
return bio_add_hw_page(q, bio, page, len, offset,
queue_max_zone_append_sectors(q), &same_page);
}
EXPORT_SYMBOL_GPL(bio_add_zone_append_page);
/**
* __bio_try_merge_page - try appending data to an existing bvec.
* @bio: destination bio

2
include/linux/bio.h
View File

@ -455,6 +455,8 @@ void bio_chain(struct bio *, struct bio *);
extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int);
extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *,
unsigned int, unsigned int);
int bio_add_zone_append_page(struct bio *bio, struct page *page,
unsigned int len, unsigned int offset);
bool __bio_try_merge_page(struct bio *bio, struct page *page,
unsigned int len, unsigned int off, bool *same_page);
void __bio_add_page(struct bio *bio, struct page *page,