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nvme: refactor nvme_submit_user_cmd() 

Divide the work into two helpers, namely nvme_alloc_user_request and
nvme_execute_user_rq. This is a prep patch, to help wiring up
uring-cmd support in nvme.

Signed-off-by: Christoph Hellwig <hch@lst.de>
[axboe: fold in fix for assuming bio is non-NULL]
Link: https://lore.kernel.org/r/20220511054750.20432-4-joshi.k@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2022-05-11 11:17:47 +05:30 committed by Jens Axboe
parent 1c2d2fff6d
commit bcad2565b5
1 changed files with 48 additions and 14 deletions
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62
drivers/nvme/host/ioctl.c
View File

@ -53,10 +53,20 @@ out:
return ERR_PTR(ret);
}
static int nvme_submit_user_cmd(struct request_queue *q,
static int nvme_finish_user_metadata(struct request *req, void __user *ubuf,
void *meta, unsigned len, int ret)
{
if (!ret && req_op(req) == REQ_OP_DRV_IN &&
copy_to_user(ubuf, meta, len))
ret = -EFAULT;
kfree(meta);
return ret;
}
static struct request *nvme_alloc_user_request(struct request_queue *q,
struct nvme_command *cmd, void __user *ubuffer,
unsigned bufflen, void __user *meta_buffer, unsigned meta_len,
u32 meta_seed, u64 *result, unsigned timeout, bool vec)
u32 meta_seed, void **metap, unsigned timeout, bool vec)
{
bool write = nvme_is_write(cmd);
struct nvme_ns *ns = q->queuedata;
@ -68,7 +78,7 @@ static int nvme_submit_user_cmd(struct request_queue *q,
req = blk_mq_alloc_request(q, nvme_req_op(cmd), 0);
if (IS_ERR(req))
return PTR_ERR(req);
return req;
nvme_init_request(req, cmd);
if (timeout)
@ -105,26 +115,50 @@ static int nvme_submit_user_cmd(struct request_queue *q,
goto out_unmap;
}
req->cmd_flags |= REQ_INTEGRITY;
*metap = meta;
}
}
ret = nvme_execute_passthru_rq(req);
if (result)
*result = le64_to_cpu(nvme_req(req)->result.u64);
if (meta && !ret && !write) {
if (copy_to_user(meta_buffer, meta, meta_len))
ret = -EFAULT;
}
kfree(meta);
out_unmap:
return req;
out_unmap:
if (bio)
blk_rq_unmap_user(bio);
out:
blk_mq_free_request(req);
return ERR_PTR(ret);
}
static int nvme_submit_user_cmd(struct request_queue *q,
struct nvme_command *cmd, void __user *ubuffer,
unsigned bufflen, void __user *meta_buffer, unsigned meta_len,
u32 meta_seed, u64 *result, unsigned timeout, bool vec)
{
struct request *req;
void *meta = NULL;
struct bio *bio;
int ret;
req = nvme_alloc_user_request(q, cmd, ubuffer, bufflen, meta_buffer,
meta_len, meta_seed, &meta, timeout, vec);
if (IS_ERR(req))
return PTR_ERR(req);
bio = req->bio;
ret = nvme_execute_passthru_rq(req);
if (result)
*result = le64_to_cpu(nvme_req(req)->result.u64);
if (meta)
ret = nvme_finish_user_metadata(req, meta_buffer, meta,
meta_len, ret);
if (bio)
blk_rq_unmap_user(bio);
out:
blk_mq_free_request(req);
return ret;
}
static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
{
struct nvme_user_io io;