[PATCHv5 2/4] nvme: use bio_integrity_map_user
Keith Busch
kbusch at meta.com
Thu Nov 30 13:53:07 PST 2023
From: Keith Busch <kbusch at kernel.org>
Map user metadata buffers directly. Now that the bio tracks the
metadata, nvme doesn't need special metadata handling and tracking with
callbacks and additional fields in the pdu.
Reviewed-by: Christoph Hellwig <hch at lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen at oracle.com>
Signed-off-by: Keith Busch <kbusch at kernel.org>
---
drivers/nvme/host/ioctl.c | 197 ++++++--------------------------------
1 file changed, 29 insertions(+), 168 deletions(-)
diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c
index 529b9954d2b8c..32c9bcf491a33 100644
--- a/drivers/nvme/host/ioctl.c
+++ b/drivers/nvme/host/ioctl.c
@@ -96,58 +96,6 @@ static void __user *nvme_to_user_ptr(uintptr_t ptrval)
return (void __user *)ptrval;
}
-static void *nvme_add_user_metadata(struct request *req, void __user *ubuf,
- unsigned len, u32 seed)
-{
- struct bio_integrity_payload *bip;
- int ret = -ENOMEM;
- void *buf;
- struct bio *bio = req->bio;
-
- buf = kmalloc(len, GFP_KERNEL);
- if (!buf)
- goto out;
-
- if (req_op(req) == REQ_OP_DRV_OUT) {
- ret = -EFAULT;
- if (copy_from_user(buf, ubuf, len))
- goto out_free_meta;
- } else {
- memset(buf, 0, len);
- }
-
- bip = bio_integrity_alloc(bio, GFP_KERNEL, 1);
- if (IS_ERR(bip)) {
- ret = PTR_ERR(bip);
- goto out_free_meta;
- }
-
- bip->bip_iter.bi_sector = seed;
- ret = bio_integrity_add_page(bio, virt_to_page(buf), len,
- offset_in_page(buf));
- if (ret != len) {
- ret = -ENOMEM;
- goto out_free_meta;
- }
-
- req->cmd_flags |= REQ_INTEGRITY;
- return buf;
-out_free_meta:
- kfree(buf);
-out:
- return ERR_PTR(ret);
-}
-
-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, blk_opf_t rq_flags,
blk_mq_req_flags_t blk_flags)
@@ -164,14 +112,12 @@ static struct request *nvme_alloc_user_request(struct request_queue *q,
static int nvme_map_user_request(struct request *req, u64 ubuffer,
unsigned bufflen, void __user *meta_buffer, unsigned meta_len,
- u32 meta_seed, void **metap, struct io_uring_cmd *ioucmd,
- unsigned int flags)
+ u32 meta_seed, struct io_uring_cmd *ioucmd, unsigned int flags)
{
struct request_queue *q = req->q;
struct nvme_ns *ns = q->queuedata;
struct block_device *bdev = ns ? ns->disk->part0 : NULL;
struct bio *bio = NULL;
- void *meta = NULL;
int ret;
if (ioucmd && (ioucmd->flags & IORING_URING_CMD_FIXED)) {
@@ -193,18 +139,17 @@ static int nvme_map_user_request(struct request *req, u64 ubuffer,
if (ret)
goto out;
+
bio = req->bio;
- if (bdev)
+ if (bdev) {
bio_set_dev(bio, bdev);
-
- if (bdev && meta_buffer && meta_len) {
- meta = nvme_add_user_metadata(req, meta_buffer, meta_len,
- meta_seed);
- if (IS_ERR(meta)) {
- ret = PTR_ERR(meta);
- goto out_unmap;
+ if (meta_buffer && meta_len) {
+ ret = bio_integrity_map_user(bio, meta_buffer, meta_len,
+ meta_seed);
+ if (ret)
+ goto out_unmap;
+ req->cmd_flags |= REQ_INTEGRITY;
}
- *metap = meta;
}
return ret;
@@ -225,7 +170,6 @@ static int nvme_submit_user_cmd(struct request_queue *q,
struct nvme_ns *ns = q->queuedata;
struct nvme_ctrl *ctrl;
struct request *req;
- void *meta = NULL;
struct bio *bio;
u32 effects;
int ret;
@@ -237,7 +181,7 @@ static int nvme_submit_user_cmd(struct request_queue *q,
req->timeout = timeout;
if (ubuffer && bufflen) {
ret = nvme_map_user_request(req, ubuffer, bufflen, meta_buffer,
- meta_len, meta_seed, &meta, NULL, flags);
+ meta_len, meta_seed, NULL, flags);
if (ret)
return ret;
}
@@ -249,9 +193,6 @@ static int nvme_submit_user_cmd(struct request_queue *q,
ret = nvme_execute_rq(req, false);
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);
blk_mq_free_request(req);
@@ -446,19 +387,10 @@ struct nvme_uring_data {
* Expect build errors if this grows larger than that.
*/
struct nvme_uring_cmd_pdu {
- union {
- struct bio *bio;
- struct request *req;
- };
- u32 meta_len;
- u32 nvme_status;
- union {
- struct {
- void *meta; /* kernel-resident buffer */
- void __user *meta_buffer;
- };
- u64 result;
- } u;
+ struct request *req;
+ struct bio *bio;
+ u64 result;
+ int status;
};
static inline struct nvme_uring_cmd_pdu *nvme_uring_cmd_pdu(
@@ -467,31 +399,6 @@ static inline struct nvme_uring_cmd_pdu *nvme_uring_cmd_pdu(
return (struct nvme_uring_cmd_pdu *)&ioucmd->pdu;
}
-static void nvme_uring_task_meta_cb(struct io_uring_cmd *ioucmd,
- unsigned issue_flags)
-{
- struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
- struct request *req = pdu->req;
- int status;
- u64 result;
-
- if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
- status = -EINTR;
- else
- status = nvme_req(req)->status;
-
- result = le64_to_cpu(nvme_req(req)->result.u64);
-
- if (pdu->meta_len)
- status = nvme_finish_user_metadata(req, pdu->u.meta_buffer,
- pdu->u.meta, pdu->meta_len, status);
- if (req->bio)
- blk_rq_unmap_user(req->bio);
- blk_mq_free_request(req);
-
- io_uring_cmd_done(ioucmd, status, result, issue_flags);
-}
-
static void nvme_uring_task_cb(struct io_uring_cmd *ioucmd,
unsigned issue_flags)
{
@@ -499,8 +406,7 @@ static void nvme_uring_task_cb(struct io_uring_cmd *ioucmd,
if (pdu->bio)
blk_rq_unmap_user(pdu->bio);
-
- io_uring_cmd_done(ioucmd, pdu->nvme_status, pdu->u.result, issue_flags);
+ io_uring_cmd_done(ioucmd, pdu->status, pdu->result, issue_flags);
}
static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req,
@@ -509,53 +415,24 @@ static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req,
struct io_uring_cmd *ioucmd = req->end_io_data;
struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
- req->bio = pdu->bio;
- if (nvme_req(req)->flags & NVME_REQ_CANCELLED) {
- pdu->nvme_status = -EINTR;
- } else {
- pdu->nvme_status = nvme_req(req)->status;
- if (!pdu->nvme_status)
- pdu->nvme_status = blk_status_to_errno(err);
- }
- pdu->u.result = le64_to_cpu(nvme_req(req)->result.u64);
+ if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
+ pdu->status = -EINTR;
+ else
+ pdu->status = nvme_req(req)->status;
+ pdu->result = le64_to_cpu(nvme_req(req)->result.u64);
/*
* For iopoll, complete it directly.
* Otherwise, move the completion to task work.
*/
- if (blk_rq_is_poll(req)) {
- WRITE_ONCE(ioucmd->cookie, NULL);
+ if (blk_rq_is_poll(req))
nvme_uring_task_cb(ioucmd, IO_URING_F_UNLOCKED);
- } else {
+ else
io_uring_cmd_do_in_task_lazy(ioucmd, nvme_uring_task_cb);
- }
return RQ_END_IO_FREE;
}
-static enum rq_end_io_ret nvme_uring_cmd_end_io_meta(struct request *req,
- blk_status_t err)
-{
- struct io_uring_cmd *ioucmd = req->end_io_data;
- struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
-
- req->bio = pdu->bio;
- pdu->req = req;
-
- /*
- * For iopoll, complete it directly.
- * Otherwise, move the completion to task work.
- */
- if (blk_rq_is_poll(req)) {
- WRITE_ONCE(ioucmd->cookie, NULL);
- nvme_uring_task_meta_cb(ioucmd, IO_URING_F_UNLOCKED);
- } else {
- io_uring_cmd_do_in_task_lazy(ioucmd, nvme_uring_task_meta_cb);
- }
-
- return RQ_END_IO_NONE;
-}
-
static int nvme_uring_cmd_io(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
struct io_uring_cmd *ioucmd, unsigned int issue_flags, bool vec)
{
@@ -567,7 +444,6 @@ static int nvme_uring_cmd_io(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
struct request *req;
blk_opf_t rq_flags = REQ_ALLOC_CACHE;
blk_mq_req_flags_t blk_flags = 0;
- void *meta = NULL;
int ret;
c.common.opcode = READ_ONCE(cmd->opcode);
@@ -615,27 +491,16 @@ static int nvme_uring_cmd_io(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
if (d.addr && d.data_len) {
ret = nvme_map_user_request(req, d.addr,
d.data_len, nvme_to_user_ptr(d.metadata),
- d.metadata_len, 0, &meta, ioucmd, vec);
+ d.metadata_len, 0, ioucmd, vec);
if (ret)
return ret;
}
- if (blk_rq_is_poll(req)) {
- ioucmd->flags |= IORING_URING_CMD_POLLED;
- WRITE_ONCE(ioucmd->cookie, req);
- }
-
/* to free bio on completion, as req->bio will be null at that time */
pdu->bio = req->bio;
- pdu->meta_len = d.metadata_len;
+ pdu->req = req;
req->end_io_data = ioucmd;
- if (pdu->meta_len) {
- pdu->u.meta = meta;
- pdu->u.meta_buffer = nvme_to_user_ptr(d.metadata);
- req->end_io = nvme_uring_cmd_end_io_meta;
- } else {
- req->end_io = nvme_uring_cmd_end_io;
- }
+ req->end_io = nvme_uring_cmd_end_io;
blk_execute_rq_nowait(req, false);
return -EIOCBQUEUED;
}
@@ -786,16 +651,12 @@ int nvme_ns_chr_uring_cmd_iopoll(struct io_uring_cmd *ioucmd,
struct io_comp_batch *iob,
unsigned int poll_flags)
{
- struct request *req;
- int ret = 0;
-
- if (!(ioucmd->flags & IORING_URING_CMD_POLLED))
- return 0;
+ struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
+ struct request *req = pdu->req;
- req = READ_ONCE(ioucmd->cookie);
if (req && blk_rq_is_poll(req))
- ret = blk_rq_poll(req, iob, poll_flags);
- return ret;
+ return blk_rq_poll(req, iob, poll_flags);
+ return 0;
}
#ifdef CONFIG_NVME_MULTIPATH
static int nvme_ns_head_ctrl_ioctl(struct nvme_ns *ns, unsigned int cmd,
--
2.34.1
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