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fuse: {io-uring} Handle SQEs - register commands

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This adds basic support for ring SQEs (with opcode=IORING_OP_URING_CMD).
For now only FUSE_IO_URING_CMD_REGISTER is handled to register queue
entries.

Signed-off-by: Bernd Schubert <bschubert@ddn.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com> # io_uring
Reviewed-by: Luis Henriques <luis@igalia.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Bernd Schubert
2025-01-24 11:54:08 +01:00
committed by Miklos Szeredi
parent 7ccd86ba3a
commit 24fe962c86
7 changed files with 542 additions and 1 deletions
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include/uapi/linux/fuse.h
+75 -1
View File
@@ -220,6 +220,15 @@
*
* 7.41
* - add FUSE_ALLOW_IDMAP
* 7.42
* - Add FUSE_OVER_IO_URING and all other io-uring related flags and data
* structures:
* - struct fuse_uring_ent_in_out
* - struct fuse_uring_req_header
* - struct fuse_uring_cmd_req
* - FUSE_URING_IN_OUT_HEADER_SZ
* - FUSE_URING_OP_IN_OUT_SZ
* - enum fuse_uring_cmd
*/
#ifndef _LINUX_FUSE_H
@@ -255,7 +264,7 @@
#define FUSE_KERNEL_VERSION 7
/** Minor version number of this interface */
#define FUSE_KERNEL_MINOR_VERSION 41
#define FUSE_KERNEL_MINOR_VERSION 42
/** The node ID of the root inode */
#define FUSE_ROOT_ID 1
@@ -425,6 +434,7 @@ struct fuse_file_lock {
* FUSE_HAS_RESEND: kernel supports resending pending requests, and the high bit
* of the request ID indicates resend requests
* FUSE_ALLOW_IDMAP: allow creation of idmapped mounts
* FUSE_OVER_IO_URING: Indicate that client supports io-uring
*/
#define FUSE_ASYNC_READ (1 << 0)
#define FUSE_POSIX_LOCKS (1 << 1)
@@ -471,6 +481,7 @@ struct fuse_file_lock {
/* Obsolete alias for FUSE_DIRECT_IO_ALLOW_MMAP */
#define FUSE_DIRECT_IO_RELAX FUSE_DIRECT_IO_ALLOW_MMAP
#define FUSE_ALLOW_IDMAP (1ULL << 40)
#define FUSE_OVER_IO_URING (1ULL << 41)
/**
* CUSE INIT request/reply flags
@@ -1206,4 +1217,67 @@ struct fuse_supp_groups {
uint32_t groups[];
};
/**
* Size of the ring buffer header
*/
#define FUSE_URING_IN_OUT_HEADER_SZ 128
#define FUSE_URING_OP_IN_OUT_SZ 128
/* Used as part of the fuse_uring_req_header */
struct fuse_uring_ent_in_out {
uint64_t flags;
/*
* commit ID to be used in a reply to a ring request (see also
* struct fuse_uring_cmd_req)
*/
uint64_t commit_id;
/* size of user payload buffer */
uint32_t payload_sz;
uint32_t padding;
uint64_t reserved;
};
/**
* Header for all fuse-io-uring requests
*/
struct fuse_uring_req_header {
/* struct fuse_in_header / struct fuse_out_header */
char in_out[FUSE_URING_IN_OUT_HEADER_SZ];
/* per op code header */
char op_in[FUSE_URING_OP_IN_OUT_SZ];
struct fuse_uring_ent_in_out ring_ent_in_out;
};
/**
* sqe commands to the kernel
*/
enum fuse_uring_cmd {
FUSE_IO_URING_CMD_INVALID = 0,
/* register the request buffer and fetch a fuse request */
FUSE_IO_URING_CMD_REGISTER = 1,
/* commit fuse request result and fetch next request */
FUSE_IO_URING_CMD_COMMIT_AND_FETCH = 2,
};
/**
* In the 80B command area of the SQE.
*/
struct fuse_uring_cmd_req {
uint64_t flags;
/* entry identifier for commits */
uint64_t commit_id;
/* queue the command is for (queue index) */
uint16_t qid;
uint8_t padding[6];
};
#endif /* _LINUX_FUSE_H */