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fs,io_uring: add infrastructure for uring-cmd

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file_operations->uring_cmd is a file private handler.
This is somewhat similar to ioctl but hopefully a lot more sane and
useful as it can be used to enable many io_uring capabilities for the
underlying operation.

IORING_OP_URING_CMD is a file private kind of request. io_uring doesn't
know what is in this command type, it's for the provider of ->uring_cmd()
to deal with.

Co-developed-by: Kanchan Joshi <joshi.k@samsung.com>
Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220511054750.20432-2-joshi.k@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2022-05-11 11:17:45 +05:30
parent 2bb04df7c2
commit ee692a21e9
4 changed files with 165 additions and 26 deletions
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21
include/uapi/linux/io_uring.h
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@@ -22,6 +22,7 @@ struct io_uring_sqe {
union {
__u64 off; /* offset into file */
__u64 addr2;
__u32 cmd_op;
};
union {
__u64 addr; /* pointer to buffer or iovecs */
@@ -61,14 +62,17 @@ struct io_uring_sqe {
__s32 splice_fd_in;
__u32 file_index;
};
__u64 addr3;
__u64 __pad2[1];
/*
* If the ring is initialized with IORING_SETUP_SQE128, then this field
* contains 64-bytes of padding, doubling the size of the SQE.
*/
__u64 __big_sqe_pad[0];
union {
struct {
__u64 addr3;
__u64 __pad2[1];
};
/*
* If the ring is initialized with IORING_SETUP_SQE128, then
* this field is used for 80 bytes of arbitrary command data
*/
__u8 cmd[0];
};
};
enum {
@@ -175,6 +179,7 @@ enum io_uring_op {
IORING_OP_FGETXATTR,
IORING_OP_GETXATTR,
IORING_OP_SOCKET,
IORING_OP_URING_CMD,
/* this goes last, obviously */
IORING_OP_LAST,