diff options
| author | Anuj Gupta | 2022-09-30 11:57:40 +0530 |
|---|---|---|
| committer | Jens Axboe | 2022-09-30 07:51:13 -0600 |
| commit | 557654025df5706785d395558244890dc4b2c875 (patch) | |
| tree | 4dd57133e765dfc9eca2b8390895207c32eadaee /block | |
| parent | 9cda70f622cdcf049521a9c2886e5fd8a90a0591 (diff) | |
block: add blk_rq_map_user_io
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>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-map.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/block/blk-map.c b/block/blk-map.c index 7693f8e3c454..0e37bbedd46c 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -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 |