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block: pass iov_iter to the BLOCK_PC mapping functions

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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>
This commit is contained in:
Kent Overstreet
2015-01-18 16:16:31 +01:00
committed by Jens Axboe
parent 1dfa0f68c0
commit 26e49cfc7e
6 changed files with 101 additions and 126 deletions
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38
block/blk-map.c
View File

@@ -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);