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authorAnuj Gupta <anuj20.g@samsung.com>2022-09-30 11:57:40 +0530
committerJens Axboe <axboe@kernel.dk>2022-09-30 07:51:13 -0600
commit557654025df5706785d395558244890dc4b2c875 (patch)
tree4dd57133e765dfc9eca2b8390895207c32eadaee /block
parent9cda70f622cdcf049521a9c2886e5fd8a90a0591 (diff)
downloadlwn-557654025df5706785d395558244890dc4b2c875.tar.gz
lwn-557654025df5706785d395558244890dc4b2c875.zip
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.c36
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