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io_uring/cmd: give inline space in request to cmds

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Some io_uring commands can use some inline space in io_kiocb. We have 32
bytes in struct io_uring_cmd, expose it.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/7ca779a61ee5e166e535d70df9c7f07b15d8a0ce.1726072086.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2024-09-11 17:34:38 +01:00 committed by Jens Axboe
parent 6746ee4c3a
commit a6ccb48e13
1 changed files with 9 additions and 0 deletions
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9
include/linux/io_uring/cmd.h
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@ -23,6 +23,15 @@ static inline const void *io_uring_sqe_cmd(const struct io_uring_sqe *sqe)
return sqe->cmd;
}
static inline void io_uring_cmd_private_sz_check(size_t cmd_sz)
{
BUILD_BUG_ON(cmd_sz > sizeof_field(struct io_uring_cmd, pdu));
}
#define io_uring_cmd_to_pdu(cmd, pdu_type) ( \
io_uring_cmd_private_sz_check(sizeof(pdu_type)), \
((pdu_type *)&(cmd)->pdu) \
)
#if defined(CONFIG_IO_URING)
int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
struct iov_iter *iter, void *ioucmd);