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io_uring: add IORING_REGISTER_RSRC

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Add a new io_uring_register() opcode for rsrc registeration. Instead of
accepting a pointer to resources, fds or iovecs, it @arg is now pointing
to a struct io_uring_rsrc_register, and the second argument tells how
large that struct is to make it easily extendible by adding new fields.

All that is done mainly to be able to pass in a pointer with tags. Pass
it in and enable CQE posting for file resources. Doesn't support setting
tags on update yet.

A design choice made here is to not post CQEs on rsrc de-registration,
but only when we updated-removed it by rsrc dynamic update.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/c498aaec32a4bb277b2406b9069662c02cdda98c.1619356238.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov
2021-04-25 14:32:21 +01:00
committed by Jens Axboe
parent fdecb66281
commit 792e35824b
2 changed files with 48 additions and 5 deletions
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8
include/uapi/linux/io_uring.h
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@@ -298,6 +298,7 @@ enum {
IORING_UNREGISTER_PERSONALITY = 10,
IORING_REGISTER_RESTRICTIONS = 11,
IORING_REGISTER_ENABLE_RINGS = 12,
IORING_REGISTER_RSRC = 13,
/* this goes last */
IORING_REGISTER_LAST
@@ -320,6 +321,13 @@ enum {
IORING_RSRC_FILE = 0,
};
struct io_uring_rsrc_register {
__u32 type;
__u32 nr;
__aligned_u64 data;
__aligned_u64 tags;
};
/* Skip updating fd indexes set to this value in the fd table */
#define IORING_REGISTER_FILES_SKIP (-2)