summaryrefslogtreecommitdiff
path: root/block/blk-map.c
diff options
context:
space:
mode:
authorKent Overstreet <kmo@daterainc.com>2015-01-18 16:16:31 +0100
committerJens Axboe <axboe@fb.com>2015-02-05 09:30:40 -0700
commit26e49cfc7e988a76bf1e55cef0d9e438e5489180 (patch)
tree43a2a3590738ef4097b63719e35fcc761a66e844 /block/blk-map.c
parent1dfa0f68c040080c5fefa7211b4ec34d202f8570 (diff)
downloadkernel-26e49cfc7e988a76bf1e55cef0d9e438e5489180.tar.gz
block: pass iov_iter to the BLOCK_PC mapping functions
Make use of a new interface provided by iov_iter, backed by scatter-gather list of iovec, instead of the old interface based on sg_iovec. Also use iov_iter_advance() instead of manual iteration. This commit should contain only literal replacements, without functional changes. Cc: Christoph Hellwig <hch@infradead.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Doug Gilbert <dgilbert@interlog.com> Cc: "James E.J. Bottomley" <JBottomley@parallels.com> Signed-off-by: Kent Overstreet <kmo@daterainc.com> [dpark: add more description in commit message] Signed-off-by: Dongsu Park <dongsu.park@profitbricks.com> [hch: fixed to do a deep clone of the iov_iter, and to properly use the iov_iter direction] Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Ming Lei <tom.leiming@gmail.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-map.c')
-rw-r--r--block/blk-map.c38
1 files changed, 19 insertions, 19 deletions
diff --git a/block/blk-map.c b/block/blk-map.c
index 152a5fe5d85e..30e6bb871c5c 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -5,7 +5,7 @@
#include <linux/module.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
-#include <scsi/sg.h> /* for struct sg_iovec */
+#include <linux/uio.h>
#include "blk.h"
@@ -44,9 +44,7 @@ static int __blk_rq_unmap_user(struct bio *bio)
* @q: request queue where request should be inserted
* @rq: request to map data to
* @map_data: pointer to the rq_map_data holding pages (if necessary)
- * @iov: pointer to the iovec
- * @iov_count: number of elements in the iovec
- * @len: I/O byte count
+ * @iter: iovec iterator
* @gfp_mask: memory allocation flags
*
* Description:
@@ -63,20 +61,21 @@ static int __blk_rq_unmap_user(struct bio *bio)
* unmapping.
*/
int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
- struct rq_map_data *map_data, const struct sg_iovec *iov,
- int iov_count, unsigned int len, gfp_t gfp_mask)
+ struct rq_map_data *map_data,
+ const struct iov_iter *iter, gfp_t gfp_mask)
{
struct bio *bio;
- int i, read = rq_data_dir(rq) == READ;
int unaligned = 0;
+ struct iov_iter i;
+ struct iovec iov;
- if (!iov || iov_count <= 0)
+ if (!iter || !iter->count)
return -EINVAL;
- for (i = 0; i < iov_count; i++) {
- unsigned long uaddr = (unsigned long)iov[i].iov_base;
+ iov_for_each(iov, i, *iter) {
+ unsigned long uaddr = (unsigned long) iov.iov_base;
- if (!iov[i].iov_len)
+ if (!iov.iov_len)
return -EINVAL;
/*
@@ -86,16 +85,15 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
unaligned = 1;
}
- if (unaligned || (q->dma_pad_mask & len) || map_data)
- bio = bio_copy_user_iov(q, map_data, iov, iov_count, read,
- gfp_mask);
+ if (unaligned || (q->dma_pad_mask & iter->count) || map_data)
+ bio = bio_copy_user_iov(q, map_data, iter, gfp_mask);
else
- bio = bio_map_user_iov(q, NULL, iov, iov_count, read, gfp_mask);
+ bio = bio_map_user_iov(q, NULL, iter, gfp_mask);
if (IS_ERR(bio))
return PTR_ERR(bio);
- if (bio->bi_iter.bi_size != len) {
+ if (bio->bi_iter.bi_size != iter->count) {
/*
* Grab an extra reference to this bio, as bio_unmap_user()
* expects to be able to drop it twice as it happens on the
@@ -121,12 +119,14 @@ int blk_rq_map_user(struct request_queue *q, struct request *rq,
struct rq_map_data *map_data, void __user *ubuf,
unsigned long len, gfp_t gfp_mask)
{
- struct sg_iovec iov;
+ struct iovec iov;
+ struct iov_iter i;
- iov.iov_base = (void __user *)ubuf;
+ iov.iov_base = ubuf;
iov.iov_len = len;
+ iov_iter_init(&i, rq_data_dir(rq), &iov, 1, len);
- return blk_rq_map_user_iov(q, rq, map_data, &iov, 1, len, gfp_mask);
+ return blk_rq_map_user_iov(q, rq, map_data, &i, gfp_mask);
}
EXPORT_SYMBOL(blk_rq_map_user);