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[RFC,2/5] io_uring/cmd: give inline space in request to cmds

Message ID 86ae0042c57c5904b40e19f6171f47fd3e8c6126.1723601134.git.asml.silence@gmail.com (mailing list archive)
State New
Headers show
Series implement asynchronous BLKDISCARD via io_uring | expand

Commit Message

Pavel Begunkov Aug. 14, 2024, 10:45 a.m. UTC 
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>
---
 include/linux/io_uring/cmd.h | 9 +++++++++
 1 file changed, 9 insertions(+)
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Patch

diff --git a/include/linux/io_uring/cmd.h b/include/linux/io_uring/cmd.h
index 86ceb3383e49..c189d36ad55e 100644
--- a/include/linux/io_uring/cmd.h
+++ b/include/linux/io_uring/cmd.h
@@ -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);