diff options
| author | Kent Overstreet <kmo@daterainc.com> | 2015-01-18 16:16:31 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-02-05 09:30:40 -0700 |
| commit | 26e49cfc7e988a76bf1e55cef0d9e438e5489180 (patch) | |
| tree | 43a2a3590738ef4097b63719e35fcc761a66e844 /drivers/scsi | |
| parent | 1dfa0f68c040080c5fefa7211b4ec34d202f8570 (diff) | |
| download | linux-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 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/sg.c | 15 |
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, |