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block: add blk_rq_map_user_io

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Create a helper blk_rq_map_user_io for mapping of vectored as well as
non-vectored requests. This will help in saving dupilcation of code at few
places in scsi and nvme.

Signed-off-by: Anuj Gupta <anuj20.g@samsung.com>
Suggested-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220930062749.152261-4-anuj20.g@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Anuj Gupta 2022-09-30 11:57:40 +05:30 committed by Jens Axboe
parent 9cda70f622
commit 557654025d
2 changed files with 38 additions and 0 deletions
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36
block/blk-map.c
View File

@ -611,6 +611,42 @@ int blk_rq_map_user(struct request_queue *q, struct request *rq,
}
EXPORT_SYMBOL(blk_rq_map_user);
int blk_rq_map_user_io(struct request *req, struct rq_map_data *map_data,
void __user *ubuf, unsigned long buf_len, gfp_t gfp_mask,
bool vec, int iov_count, bool check_iter_count, int rw)
{
int ret = 0;
if (vec) {
struct iovec fast_iov[UIO_FASTIOV];
struct iovec *iov = fast_iov;
struct iov_iter iter;
ret = import_iovec(rw, ubuf, iov_count ? iov_count : buf_len,
UIO_FASTIOV, &iov, &iter);
if (ret < 0)
return ret;
if (iov_count) {
/* SG_IO howto says that the shorter of the two wins */
iov_iter_truncate(&iter, buf_len);
if (check_iter_count && !iov_iter_count(&iter)) {
kfree(iov);
return -EINVAL;
}
}
ret = blk_rq_map_user_iov(req->q, req, map_data, &iter,
gfp_mask);
kfree(iov);
} else if (buf_len) {
ret = blk_rq_map_user(req->q, req, map_data, ubuf, buf_len,
gfp_mask);
}
return ret;
}
EXPORT_SYMBOL(blk_rq_map_user_io);
/**
* blk_rq_unmap_user - unmap a request with user data
* @bio: start of bio list

2
include/linux/blk-mq.h
View File

@ -985,6 +985,8 @@ struct rq_map_data {
int blk_rq_map_user(struct request_queue *, struct request *,
struct rq_map_data *, void __user *, unsigned long, gfp_t);
int blk_rq_map_user_io(struct request *, struct rq_map_data *,
void __user *, unsigned long, gfp_t, bool, int, bool, int);
int blk_rq_map_user_iov(struct request_queue *, struct request *,
struct rq_map_data *, const struct iov_iter *, gfp_t);
int blk_rq_unmap_user(struct bio *);