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io-uring: move `struct io_br_sel` into io_uring_types.h 

Move `struct io_br_sel` into io_uring_types.h and prepare for supporting
provided buffer on uring_cmd.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20250821040210.1152145-2-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2025-08-21 12:02:06 +08:00 committed by Jens Axboe
parent fe524b0684
commit d589bcddaa
2 changed files with 19 additions and 18 deletions
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19
include/linux/io_uring_types.h
View File

@ -85,6 +85,25 @@ struct io_mapped_region {
unsigned flags;
};
/*
* Return value from io_buffer_list selection, to avoid stashing it in
* struct io_kiocb. For legacy/classic provided buffers, keeping a reference
* across execution contexts are fine. But for ring provided buffers, the
* list may go away as soon as ->uring_lock is dropped. As the io_kiocb
* persists, it's better to just keep the buffer local for those cases.
*/
struct io_br_sel {
struct io_buffer_list *buf_list;
/*
* Some selection parts return the user address, others return an error.
*/
union {
void __user *addr;
ssize_t val;
};
};
/*
* Arbitrary limit, can be raised if need be
*/

18
io_uring/kbuf.h
View File

@ -62,24 +62,6 @@ struct buf_sel_arg {
unsigned short partial_map;
};
/*
* Return value from io_buffer_list selection, to avoid stashing it in
* struct io_kiocb. For legacy/classic provided buffers, keeping a reference
* across execution contexts are fine. But for ring provided buffers, the
* list may go away as soon as ->uring_lock is dropped. As the io_kiocb
* persists, it's better to just keep the buffer local for those cases.
*/
struct io_br_sel {
struct io_buffer_list *buf_list;
/*
* Some selection parts return the user address, others return an error.
*/
union {
void __user *addr;
ssize_t val;
};
};
struct io_br_sel io_buffer_select(struct io_kiocb *req, size_t *len,
unsigned buf_group, unsigned int issue_flags);
int io_buffers_select(struct io_kiocb *req, struct buf_sel_arg *arg,