ich777/linux_media
1
0
Fork 0
mirror of https://github.com/tbsdtv/linux_media.git synced 2025-07-24 05:01:03 +02:00
Code Issues Packages Projects Releases Wiki Activity

io_uring: add flag for allocating a fully sparse direct descriptor space

Browse Source 
Currently to setup a fully sparse descriptor space upfront, the app needs
to alloate an array of the full size and memset it to -1 and then pass
that in. Make this a bit easier by allowing a flag that simply does
this internally rather than needing to copy each slot separately.

This works with IORING_REGISTER_FILES2 as the flag is set in struct
io_uring_rsrc_register, and is only allow when the type is
IORING_RSRC_FILE as this doesn't make sense for registered buffers.

Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2022-05-09 09:29:14 -06:00
parent 09893e15f1
commit a8da73a32b
2 changed files with 19 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
include/uapi/linux/io_uring.h
View File

@@ -396,9 +396,15 @@ struct io_uring_files_update {
__aligned_u64 /* __s32 * */ fds;
};
/*
* Register a fully sparse file space, rather than pass in an array of all
* -1 file descriptors.
*/
#define IORING_RSRC_REGISTER_SPARSE (1U << 0)
struct io_uring_rsrc_register {
__u32 nr;
__u32 resv;
__u32 flags;
__u64 resv2;
__aligned_u64 data;
__aligned_u64 tags;