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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/scsi_ioctl.c
parent1dfa0f68c040080c5fefa7211b4ec34d202f8570 (diff)
downloadlwn-26e49cfc7e988a76bf1e55cef0d9e438e5489180.tar.gz
lwn-26e49cfc7e988a76bf1e55cef0d9e438e5489180.zip
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/scsi_ioctl.c')
-rw-r--r--block/scsi_ioctl.c17
1 files changed, 4 insertions, 13 deletions
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 28163fad3c5d..e1f71c396193 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -332,7 +332,7 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
ret = 0;
if (hdr->iovec_count) {
- size_t iov_data_len;
+ struct iov_iter i;
struct iovec *iov = NULL;
ret = rw_copy_check_uvector(-1, hdr->dxferp, hdr->iovec_count,
@@ -342,20 +342,11 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
goto out_free_cdb;
}
- iov_data_len = ret;
- ret = 0;
-
/* SG_IO howto says that the shorter of the two wins */
- if (hdr->dxfer_len < iov_data_len) {
- hdr->iovec_count = iov_shorten(iov,
- hdr->iovec_count,
- hdr->dxfer_len);
- iov_data_len = hdr->dxfer_len;
- }
+ iov_iter_init(&i, rq_data_dir(rq), iov, hdr->iovec_count,
+ min_t(unsigned, ret, hdr->dxfer_len));
- ret = blk_rq_map_user_iov(q, rq, NULL, (struct sg_iovec *) iov,
- hdr->iovec_count,
- iov_data_len, GFP_KERNEL);
+ ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL);
kfree(iov);
} else if (hdr->dxfer_len)
ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,