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Date: Wed, 01 Apr 2009 17:50:43 +0300
From: Boaz Harrosh <bharrosh@...asas.com>
To: Tejun Heo <tj@...nel.org>
CC: axboe@...nel.dk, linux-kernel@...r.kernel.org,
fujita.tomonori@....ntt.co.jp
Subject: Re: [PATCH 06/17] blk-map/bio: use struct iovec instead of sg_iovec
On 04/01/2009 04:44 PM, Tejun Heo wrote:
> Impact: cleanup
>
> blk-map and bio use sg_iovec for addr-len segments although there
> isn't anything sg-specific about the API. This is mostly due to
> historical reasons. sg_iovec is by definition identical to iovec.
> Use iovec instead. This removes bogus dependency on scsi sg and will
> allow use of iovec helpers.
>
> Signed-off-by: Tejun Heo <tj@...nel.org>
> ---
> block/blk-map.c | 5 ++---
> block/scsi_ioctl.c | 8 +++-----
> fs/bio.c | 23 +++++++++++------------
> include/linux/bio.h | 6 +++---
> include/linux/blkdev.h | 8 ++++----
> 5 files changed, 23 insertions(+), 27 deletions(-)
>
OK, The actual one user in sg.c passes a void*, so no casts are
needed. (I couldn't find where are the type-casts of old users)
Should we make this a part of a bigger cleanup that removes
sg_iovec, from Kernel altogether and only makes a #define for
user-mode?
BTW:
user-mode scsi/sg.h does not come from the Kernels exported
headers. It comes with the gcc distribution.
If we remove it alltogether it will not affect anybody.
If you want I can help with this little chore?
Boaz
> diff --git a/block/blk-map.c b/block/blk-map.c
> index 29aa60d..4f0221a 100644
> --- a/block/blk-map.c
> +++ b/block/blk-map.c
> @@ -5,7 +5,6 @@
> #include <linux/module.h>
> #include <linux/bio.h>
> #include <linux/blkdev.h>
> -#include <scsi/sg.h> /* for struct sg_iovec */
>
> #include "blk.h"
>
> @@ -64,7 +63,7 @@ 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, struct sg_iovec *iov,
> + struct rq_map_data *map_data, struct iovec *iov,
> int iov_count, unsigned int len, gfp_t gfp_mask)
> {
> struct bio *bio = ERR_PTR(-EINVAL);
> @@ -130,7 +129,7 @@ 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;
>
> iov.iov_base = ubuf;
> iov.iov_len = len;
> diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
> index c8e8868..73cfd91 100644
> --- a/block/scsi_ioctl.c
> +++ b/block/scsi_ioctl.c
> @@ -289,7 +289,7 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
> if (hdr->iovec_count) {
> const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
> size_t iov_data_len;
> - struct sg_iovec *iov;
> + struct iovec *iov;
>
> iov = kmalloc(size, GFP_KERNEL);
> if (!iov) {
> @@ -304,11 +304,9 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
> }
>
> /* SG_IO howto says that the shorter of the two wins */
> - iov_data_len = iov_length((struct iovec *)iov,
> - hdr->iovec_count);
> + iov_data_len = iov_length(iov, hdr->iovec_count);
> if (hdr->dxfer_len < iov_data_len) {
> - hdr->iovec_count = iov_shorten((struct iovec *)iov,
> - hdr->iovec_count,
> + hdr->iovec_count = iov_shorten(iov, hdr->iovec_count,
> hdr->dxfer_len);
> iov_data_len = hdr->dxfer_len;
> }
> diff --git a/fs/bio.c b/fs/bio.c
> index 70e5153..9d13f21 100644
> --- a/fs/bio.c
> +++ b/fs/bio.c
> @@ -28,7 +28,6 @@
> #include <linux/blktrace_api.h>
> #include <linux/pfn.h>
> #include <trace/block.h>
> -#include <scsi/sg.h> /* for struct sg_iovec */
>
> DEFINE_TRACE(block_split);
>
> @@ -656,17 +655,17 @@ int bio_add_page(struct bio *bio, struct page *page, unsigned int len,
>
> struct bio_map_data {
> struct bio_vec *iovecs;
> - struct sg_iovec *sgvecs;
> + struct iovec *sgvecs;
> int nr_sgvecs;
> int is_our_pages;
> };
>
> static void bio_set_map_data(struct bio_map_data *bmd, struct bio *bio,
> - struct sg_iovec *iov, int iov_count,
> + struct iovec *iov, int iov_count,
> int is_our_pages)
> {
> memcpy(bmd->iovecs, bio->bi_io_vec, sizeof(struct bio_vec) * bio->bi_vcnt);
> - memcpy(bmd->sgvecs, iov, sizeof(struct sg_iovec) * iov_count);
> + memcpy(bmd->sgvecs, iov, sizeof(struct iovec) * iov_count);
> bmd->nr_sgvecs = iov_count;
> bmd->is_our_pages = is_our_pages;
> bio->bi_private = bmd;
> @@ -693,7 +692,7 @@ static struct bio_map_data *bio_alloc_map_data(int nr_segs, int iov_count,
> return NULL;
> }
>
> - bmd->sgvecs = kmalloc(sizeof(struct sg_iovec) * iov_count, gfp_mask);
> + bmd->sgvecs = kmalloc(sizeof(struct iovec) * iov_count, gfp_mask);
> if (bmd->sgvecs)
> return bmd;
>
> @@ -703,7 +702,7 @@ static struct bio_map_data *bio_alloc_map_data(int nr_segs, int iov_count,
> }
>
> static int __bio_copy_iov(struct bio *bio, struct bio_vec *iovecs,
> - struct sg_iovec *iov, int iov_count, int uncopy,
> + struct iovec *iov, int iov_count, int uncopy,
> int do_free_page)
> {
> int ret = 0, i;
> @@ -789,7 +788,7 @@ int bio_uncopy_user(struct bio *bio)
> */
> struct bio *bio_copy_user_iov(struct request_queue *q,
> struct rq_map_data *map_data,
> - struct sg_iovec *iov, int iov_count, int rw,
> + struct iovec *iov, int iov_count, int rw,
> gfp_t gfp_mask)
> {
> struct bio_map_data *bmd;
> @@ -909,7 +908,7 @@ struct bio *bio_copy_user(struct request_queue *q, struct rq_map_data *map_data,
> unsigned long uaddr, unsigned int len, int rw,
> gfp_t gfp_mask)
> {
> - struct sg_iovec iov;
> + struct iovec iov;
>
> iov.iov_base = (void __user *)uaddr;
> iov.iov_len = len;
> @@ -919,7 +918,7 @@ struct bio *bio_copy_user(struct request_queue *q, struct rq_map_data *map_data,
>
> static struct bio *__bio_map_user_iov(struct request_queue *q,
> struct block_device *bdev,
> - struct sg_iovec *iov, int iov_count,
> + struct iovec *iov, int iov_count,
> int rw, gfp_t gfp_mask)
> {
> int i, j;
> @@ -1044,7 +1043,7 @@ struct bio *bio_map_user(struct request_queue *q, struct block_device *bdev,
> unsigned long uaddr, unsigned int len, int rw,
> gfp_t gfp_mask)
> {
> - struct sg_iovec iov;
> + struct iovec iov;
>
> iov.iov_base = (void __user *)uaddr;
> iov.iov_len = len;
> @@ -1053,7 +1052,7 @@ struct bio *bio_map_user(struct request_queue *q, struct block_device *bdev,
> }
>
> /**
> - * bio_map_user_iov - map user sg_iovec table into bio
> + * bio_map_user_iov - map user iovec table into bio
> * @q: the struct request_queue for the bio
> * @bdev: destination block device
> * @iov: the iovec.
> @@ -1065,7 +1064,7 @@ struct bio *bio_map_user(struct request_queue *q, struct block_device *bdev,
> * device. Returns an error pointer in case of error.
> */
> struct bio *bio_map_user_iov(struct request_queue *q, struct block_device *bdev,
> - struct sg_iovec *iov, int iov_count, int rw,
> + struct iovec *iov, int iov_count, int rw,
> gfp_t gfp_mask)
> {
> struct bio *bio;
> diff --git a/include/linux/bio.h b/include/linux/bio.h
> index 45f56d2..8215ded 100644
> --- a/include/linux/bio.h
> +++ b/include/linux/bio.h
> @@ -23,6 +23,7 @@
> #include <linux/highmem.h>
> #include <linux/mempool.h>
> #include <linux/ioprio.h>
> +#include <linux/uio.h>
>
> #ifdef CONFIG_BLOCK
>
> @@ -356,7 +357,6 @@ struct bio_pair {
> };
>
> struct request_queue;
> -struct sg_iovec;
> struct rq_map_data;
>
> struct bio_pair *bio_split(struct bio *bi, int first_sectors);
> @@ -390,7 +390,7 @@ struct bio *bio_map_user(struct request_queue *q, struct block_device *bdev,
> unsigned long uaddr, unsigned int len, int rw,
> gfp_t gfp_mask);
> struct bio *bio_map_user_iov(struct request_queue *q, struct block_device *bdev,
> - struct sg_iovec *iov, int iov_count, int rw,
> + struct iovec *iov, int iov_count, int rw,
> gfp_t gfp_mask);
> void bio_unmap_user(struct bio *bio);
> struct bio *bio_copy_user(struct request_queue *q, struct rq_map_data *map_data,
> @@ -398,7 +398,7 @@ struct bio *bio_copy_user(struct request_queue *q, struct rq_map_data *map_data,
> gfp_t gfp_mask);
> struct bio *bio_copy_user_iov(struct request_queue *q,
> struct rq_map_data *map_data,
> - struct sg_iovec *iov, int iov_count, int rw,
> + struct iovec *iov, int iov_count, int rw,
> gfp_t gfp_mask);
> int bio_uncopy_user(struct bio *bio);
> struct bio *bio_map_kern(struct request_queue *q, void *data, unsigned int len,
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index 465d6ba..d7bb20c 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -19,6 +19,7 @@
> #include <linux/gfp.h>
> #include <linux/bsg.h>
> #include <linux/smp.h>
> +#include <linux/uio.h>
>
> #include <asm/scatterlist.h>
>
> @@ -29,7 +30,6 @@ struct elevator_queue;
> struct request_pm_state;
> struct blk_trace;
> struct request;
> -struct sg_io_hdr;
>
> #define BLKDEV_MIN_RQ 4
> #define BLKDEV_MAX_RQ 128 /* Default maximum */
> @@ -781,9 +781,9 @@ extern int blk_rq_map_user(struct request_queue *, struct request *,
> gfp_t);
> extern int blk_rq_unmap_user(struct bio *);
> extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
> -extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
> - struct rq_map_data *, struct sg_iovec *, int,
> - unsigned int, gfp_t);
> +extern int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
> + struct rq_map_data *map_data, struct iovec *iov,
> + int iov_count, unsigned int len, gfp_t gfp_mask);
> extern int blk_execute_rq(struct request_queue *, struct gendisk *,
> struct request *, int);
> extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
--
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