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authorBart Van Assche <bvanassche@acm.org>2019-08-01 15:50:41 -0700
committerJens Axboe <axboe@kernel.dk>2019-08-04 21:41:29 -0600
commitdad7758459bc6097115f5e783eda232f36b1ad99 (patch)
treecdf3e749fb4b8b0d9865f1c00c6139d64ee15e65 /block
parentaf2c68fe94e8c0a628519b60ba070c5cf6526a99 (diff)
block: Document the bio splitting functions
Since what the bio splitting functions do is nontrivial, document these functions. Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Cc: Christoph Hellwig <hch@infradead.org> Cc: Ming Lei <ming.lei@redhat.com> Cc: Hannes Reinecke <hare@suse.com> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/bio.c4
-rw-r--r--block/blk-merge.c43
2 files changed, 45 insertions, 2 deletions
diff --git a/block/bio.c b/block/bio.c
index 299a0e7651ec..0fff4eb9eb1e 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1842,8 +1842,8 @@ EXPORT_SYMBOL(bio_endio);
* @bio, and updates @bio to represent the remaining sectors.
*
* Unless this is a discard request the newly allocated bio will point
- * to @bio's bi_io_vec; it is the caller's responsibility to ensure that
- * @bio is not freed before the split.
+ * to @bio's bi_io_vec. It is the caller's responsibility to ensure that
+ * neither @bio nor @bs are freed before the split bio.
*/
struct bio *bio_split(struct bio *bio, int sectors,
gfp_t gfp, struct bio_set *bs)
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 8344d94f13e0..51ed971709c3 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -195,6 +195,25 @@ static bool bvec_split_segs(const struct request_queue *q,
return !!len;
}
+/**
+ * blk_bio_segment_split - split a bio in two bios
+ * @q: [in] request queue pointer
+ * @bio: [in] bio to be split
+ * @bs: [in] bio set to allocate the clone from
+ * @segs: [out] number of segments in the bio with the first half of the sectors
+ *
+ * Clone @bio, update the bi_iter of the clone to represent the first sectors
+ * of @bio and update @bio->bi_iter to represent the remaining sectors. The
+ * following is guaranteed for the cloned bio:
+ * - That it has at most get_max_io_size(@q, @bio) sectors.
+ * - That it has at most queue_max_segments(@q) segments.
+ *
+ * Except for discard requests the cloned bio will point at the bi_io_vec of
+ * the original bio. It is the responsibility of the caller to ensure that the
+ * original bio is not freed before the cloned bio. The caller is also
+ * responsible for ensuring that @bs is only destroyed after processing of the
+ * split bio has finished.
+ */
static struct bio *blk_bio_segment_split(struct request_queue *q,
struct bio *bio,
struct bio_set *bs,
@@ -251,6 +270,19 @@ split:
return bio_split(bio, sectors, GFP_NOIO, bs);
}
+/**
+ * __blk_queue_split - split a bio and submit the second half
+ * @q: [in] request queue pointer
+ * @bio: [in, out] bio to be split
+ * @nr_segs: [out] number of segments in the first bio
+ *
+ * Split a bio into two bios, chain the two bios, submit the second half and
+ * store a pointer to the first half in *@bio. If the second bio is still too
+ * big it will be split by a recursive call to this function. Since this
+ * function may allocate a new bio from @q->bio_split, it is the responsibility
+ * of the caller to ensure that @q is only released after processing of the
+ * split bio has finished.
+ */
void __blk_queue_split(struct request_queue *q, struct bio **bio,
unsigned int *nr_segs)
{
@@ -295,6 +327,17 @@ void __blk_queue_split(struct request_queue *q, struct bio **bio,
}
}
+/**
+ * blk_queue_split - split a bio and submit the second half
+ * @q: [in] request queue pointer
+ * @bio: [in, out] bio to be split
+ *
+ * Split a bio into two bios, chains the two bios, submit the second half and
+ * store a pointer to the first half in *@bio. Since this function may allocate
+ * a new bio from @q->bio_split, it is the responsibility of the caller to
+ * ensure that @q is only released after processing of the split bio has
+ * finished.
+ */
void blk_queue_split(struct request_queue *q, struct bio **bio)
{
unsigned int nr_segs;