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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 /drivers/scsi
parent1dfa0f68c040080c5fefa7211b4ec34d202f8570 (diff)
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 'drivers/scsi')
-rw-r--r--drivers/scsi/sg.c15
1 files changed, 6 insertions, 9 deletions
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index b14f64cb9724..4052e592818c 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1734,22 +1734,19 @@ sg_start_req(Sg_request *srp, unsigned char *cmd)
}
if (iov_count) {
- int len, size = sizeof(struct sg_iovec) * iov_count;
+ int size = sizeof(struct iovec) * iov_count;
struct iovec *iov;
+ struct iov_iter i;
iov = memdup_user(hp->dxferp, size);
if (IS_ERR(iov))
return PTR_ERR(iov);
- len = iov_length(iov, iov_count);
- if (hp->dxfer_len < len) {
- iov_count = iov_shorten(iov, iov_count, hp->dxfer_len);
- len = hp->dxfer_len;
- }
+ iov_iter_init(&i, rw, iov, iov_count,
+ min_t(size_t, hp->dxfer_len,
+ iov_length(iov, iov_count)));
- res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov,
- iov_count,
- len, GFP_ATOMIC);
+ res = blk_rq_map_user_iov(q, rq, md, &i, GFP_ATOMIC);
kfree(iov);
} else
res = blk_rq_map_user(q, rq, md, hp->dxferp,