From: Jens Axboe <[email protected]>
To: [email protected]
Cc: [email protected], [email protected], [email protected],
[email protected], [email protected],
Jens Axboe <[email protected]>
Subject: [PATCH 6/8] block: add example ioctl
Date: Wed, 17 Mar 2021 16:10:25 -0600 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
Grab op == 1, BLOCK_URING_OP_IOCTL, and use it to implement basic
ioctl functionality.
Example code, to issue BLKBSZGET through IORING_OP_URING_CMD:
struct block_uring_cmd {
__u32 ioctl_cmd;
__u32 unused1;
__u64 unused2[4];
};
static int get_bs(struct io_uring *ring, const char *dev)
{
struct io_uring_cqe *cqe;
struct io_uring_sqe *sqe;
struct io_uring_cmd_sqe *csqe;
struct block_uring_cmd *cmd;
int ret, fd;
fd = open(dev, O_RDONLY);
sqe = io_uring_get_sqe(ring);
csqe = (void *) sqe;
memset(csqe, 0, sizeof(*csqe));
csqe->hdr.opcode = IORING_OP_URING_CMD;
csqe->hdr.fd = fd;
csqe->user_data = 0x1234;
csqe->op = BLOCK_URING_OP_IOCTL;
io_uring_submit(ring);
io_uring_wait_cqe(ring, &cqe);
printf("bs=%d\n", cqe->res);
io_uring_cqe_seen(ring, cqe);
return 0;
err:
return 1;
}
Signed-off-by: Jens Axboe <[email protected]>
---
fs/block_dev.c | 20 ++++++++++++++++++++
include/linux/blkdev.h | 11 +++++++++++
2 files changed, 31 insertions(+)
diff --git a/fs/block_dev.c b/fs/block_dev.c
index cbc403ad0330..9e44f63a0fe1 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -318,11 +318,31 @@ struct blkdev_dio {
static struct bio_set blkdev_dio_pool;
+static int blkdev_uring_ioctl(struct block_device *bdev,
+ struct io_uring_cmd *cmd)
+{
+ struct block_uring_cmd *bcmd = (struct block_uring_cmd *) &cmd->pdu;
+
+ switch (bcmd->ioctl_cmd) {
+ case BLKBSZGET:
+ return block_size(bdev);
+ default:
+ return -ENOTTY;
+ }
+}
+
static int blkdev_uring_cmd(struct io_uring_cmd *cmd,
enum io_uring_cmd_flags flags)
{
struct block_device *bdev = I_BDEV(cmd->file->f_mapping->host);
+ switch (cmd->op) {
+ case BLOCK_URING_OP_IOCTL:
+ return blkdev_uring_ioctl(bdev, cmd);
+ default:
+ break;
+ }
+
return blk_uring_cmd(bdev, cmd, flags);
}
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 7eb993e82783..fa895aa3b51a 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -44,6 +44,17 @@ struct blk_queue_stats;
struct blk_stat_callback;
struct blk_keyslot_manager;
+enum {
+ BLOCK_URING_OP_IOCTL = 1,
+};
+
+/* This overlays struct io_uring_cmd pdu (40 bytes) */
+struct block_uring_cmd {
+ __u32 ioctl_cmd;
+ __u32 unused1;
+ __u64 unused2[4];
+};
+
#define BLKDEV_MIN_RQ 4
#define BLKDEV_MAX_RQ 128 /* Default maximum */
--
2.31.0
next prev parent reply other threads:[~2021-03-17 22:11 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-17 22:10 [PATCHSET v4 0/8] io_uring passthrough support Jens Axboe
2021-03-17 22:10 ` [PATCH 1/8] io_uring: split up io_uring_sqe into hdr + main Jens Axboe
2021-03-18 5:34 ` Christoph Hellwig
2021-03-18 18:40 ` Jens Axboe
2021-03-19 11:20 ` Stefan Metzmacher
2021-03-19 13:29 ` Christoph Hellwig
2022-02-24 22:34 ` Luis Chamberlain
2021-03-17 22:10 ` [PATCH 2/8] io_uring: add infrastructure around io_uring_cmd_sqe issue type Jens Axboe
2021-03-17 22:10 ` [PATCH 3/8] fs: add file_operations->uring_cmd() Jens Axboe
2021-03-18 5:38 ` Christoph Hellwig
2021-03-18 18:41 ` Jens Axboe
2022-02-17 1:27 ` Luis Chamberlain
2022-02-17 1:25 ` Luis Chamberlain
2021-03-17 22:10 ` [PATCH 4/8] io_uring: add support for IORING_OP_URING_CMD Jens Axboe
2021-03-18 5:42 ` Christoph Hellwig
2021-03-18 18:43 ` Jens Axboe
2021-03-17 22:10 ` [PATCH 5/8] block: wire up support for file_operations->uring_cmd() Jens Axboe
2021-03-18 5:44 ` Christoph Hellwig
2021-03-17 22:10 ` Jens Axboe [this message]
2021-03-18 5:45 ` [PATCH 6/8] block: add example ioctl Christoph Hellwig
2021-03-18 12:43 ` Pavel Begunkov
2021-03-18 18:44 ` Jens Axboe
2021-03-17 22:10 ` [PATCH 7/8] net: wire up support for file_operations->uring_cmd() Jens Axboe
2022-02-17 1:03 ` Luis Chamberlain
2021-03-17 22:10 ` [PATCH 8/8] net: add example SOCKET_URING_OP_SIOCINQ/SOCKET_URING_OP_SIOCOUTQ Jens Axboe
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