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io_uring/rsrc: allow cloning at an offset

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Right now buffer cloning is an all-or-nothing kind of thing - either the
whole table is cloned from a source to a destination ring, or nothing at
all.

However, it's not always desired to clone the whole thing. Allow for
the application to specify a source and destination offset, and a
number of buffers to clone. If the destination offset is non-zero, then
allocate sparse nodes upfront.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2024-10-28 18:43:13 -06:00
parent d50f94d761
commit b16e920a19
2 changed files with 30 additions and 7 deletions
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include/uapi/linux/io_uring.h
+4 -1
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@@ -719,7 +719,10 @@ enum {
struct io_uring_clone_buffers {
__u32 src_fd;
__u32 flags;
__u32 pad[6];
__u32 src_off;
__u32 dst_off;
__u32 nr;
__u32 pad[3];
};
struct io_uring_buf {