From: Jens Axboe <axboe@kernel.dk>
To: io-uring@vger.kernel.org
Cc: Jens Axboe <axboe@kernel.dk>
Subject: [PATCH 4/5] block: add example ioctl
Date: Wed, 27 Jan 2021 14:25:40 -0700 [thread overview]
Message-ID: <20210127212541.88944-5-axboe@kernel.dk> (raw)
In-Reply-To: <20210127212541.88944-1-axboe@kernel.dk>
Example code, to issue BLKBSZGET through IORING_OP_URING_CMD:
struct block_uring_cmd {
__u16 op;
__u16 pad;
union {
__u32 size;
__u32 ioctl_cmd;
};
__u64 addr;
__u64 unused[2];
__u64 reserved; /* can never be used */
__u64 unused2;
};
static int get_bs(struct io_uring *ring, const char *dev)
{
struct io_uring_cqe *cqe;
struct io_uring_sqe *sqe;
struct block_uring_cmd *cmd;
int ret, fd;
fd = open(dev, O_RDONLY);
if (fd < 0) {
perror("open");
return 1;
}
sqe = io_uring_get_sqe(ring);
if (!sqe) {
fprintf(stderr, "get sqe failed\n");
goto err;
}
memset(sqe, 0, sizeof(*sqe));
sqe->opcode = IORING_OP_URING_CMD;
sqe->fd = fd;
cmd = (void *) &sqe->off;
cmd->op = BLOCK_URING_OP_IOCTL;
cmd->ioctl_cmd = BLKBSZGET;
sqe->user_data = 0x1234;
ret = io_uring_submit(ring);
if (ret <= 0) {
fprintf(stderr, "sqe submit failed: %d\n", ret);
goto err;
}
ret = io_uring_wait_cqe(ring, &cqe);
if (ret < 0) {
fprintf(stderr, "wait completion %d\n", ret);
goto err;
}
printf("bs=%d\n", cqe->res);
io_uring_cqe_seen(ring, cqe);
return 0;
err:
return 1;
}
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
fs/block_dev.c | 19 +++++++++++++++++++
include/linux/blkdev.h | 17 +++++++++++++++++
2 files changed, 36 insertions(+)
diff --git a/fs/block_dev.c b/fs/block_dev.c
index c837912c1d72..7cb1b24ebbb5 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -302,10 +302,29 @@ struct blkdev_dio {
static struct bio_set blkdev_dio_pool;
+static int blkdev_uring_ioctl(struct block_device *bdev,
+ struct block_uring_cmd *bcmd)
+{
+ 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);
+ struct block_uring_cmd *bcmd = (struct block_uring_cmd *) &cmd->pdu;
+
+ switch (bcmd->op) {
+ case BLOCK_URING_OP_IOCTL:
+ return blkdev_uring_ioctl(bdev, bcmd);
+ default:
+ break;
+ }
return blk_uring_cmd(bdev, cmd, flags);
}
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index d5af592d73fe..48ac8ccbffe2 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -44,6 +44,23 @@ struct blk_queue_stats;
struct blk_stat_callback;
struct blk_keyslot_manager;
+enum {
+ BLOCK_URING_OP_IOCTL = 1,
+};
+
+struct block_uring_cmd {
+ __u16 op;
+ __u16 pad;
+ union {
+ __u32 size;
+ __u32 ioctl_cmd;
+ };
+ __u64 addr;
+ __u64 unused[2];
+ __u64 reserved; /* can never be used */
+ __u64 unused2;
+};
+
#define BLKDEV_MIN_RQ 4
#define BLKDEV_MAX_RQ 128 /* Default maximum */
--
2.30.0
next prev parent reply other threads:[~2021-01-27 21:27 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-27 21:25 [PATCHSET RFC 0/5] file_operations based io_uring commands Jens Axboe
2021-01-27 21:25 ` [PATCH 1/5] fs: add file_operations->uring_cmd() Jens Axboe
2021-01-27 21:25 ` [PATCH 2/5] io_uring: add support for IORING_OP_URING_CMD Jens Axboe
2021-01-28 0:38 ` Darrick J. Wong
2021-01-28 1:45 ` Jens Axboe
2021-01-28 2:19 ` Jens Axboe
2021-02-20 3:57 ` Stefan Metzmacher
2021-02-20 14:50 ` Jens Axboe
2021-02-20 16:45 ` Jens Axboe
2021-02-22 20:04 ` Stefan Metzmacher
2021-02-22 20:14 ` Jens Axboe
2021-02-23 8:14 ` Stefan Metzmacher
2021-02-23 13:21 ` Pavel Begunkov
2021-01-27 21:25 ` [PATCH 3/5] block: wire up support for file_operations->uring_cmd() Jens Axboe
2021-01-27 21:25 ` Jens Axboe [this message]
2021-01-27 21:25 ` [PATCH 5/5] net: " Jens Axboe
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