On 11/7/24 07:26, Anuj gupta wrote:
On Thu, Nov 7, 2024 at 11:25 AM Christoph Hellwig <hch@xxxxxx> wrote:
...
struct io_uring_sqe_ext { /* * Reservered for please tell me what and why it is in the beginning * and not the end: */ __u64 rsvd0[4];This space is reserved for extended capabilities that might be added down the line. It was at the end in the earlier versions, but it is moved to the beginning now to maintain contiguity with the free space (18b) available in the first SQE, based on previous discussions [1]. [1] https://lore.kernel.org/linux-block/ceb58d97-b2e3-4d36-898d-753ba69476be@xxxxxxxxxxx/
I don't believe it helps much anything, placing a structure on the border between SQEs also feels a bit odd. -- Pavel Begunkov
