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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 <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Doug Gilbert <[email protected]>
Cc: "James E.J. Bottomley" <[email protected]>
Signed-off-by: Kent Overstreet <[email protected]>
[dpark: add more description in commit message]
Signed-off-by: Dongsu Park <[email protected]>
[hch: fixed to do a deep clone of the iov_iter, and to properly use
      the iov_iter direction]
Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Ming Lei <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Kent Overstreet 2015-01-18 16:16:31 +01:00 • committed by Jens Axboe
commit 26e49cfc7e
6 changed files with 101 additions and 126 deletions
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15
drivers/scsi/sg.c
View file

@ -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,