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io_uring: provide means of removing buffers

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We have IORING_OP_PROVIDE_BUFFERS, but the only way to remove buffers
is to trigger IO on them. The usual case of shrinking a buffer pool
would be to just not replenish the buffers when IO completes, and
instead just free it. But it may be nice to have a way to manually
remove a number of buffers from a given group, and
IORING_OP_REMOVE_BUFFERS provides that functionality.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-03-02 16:32:28 -07:00
parent 52de1fe122
commit 067524e914
2 changed files with 84 additions and 19 deletions
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1
include/uapi/linux/io_uring.h
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@ -128,6 +128,7 @@ enum {
IORING_OP_EPOLL_CTL,
IORING_OP_SPLICE,
IORING_OP_PROVIDE_BUFFERS,
IORING_OP_REMOVE_BUFFERS,
/* this goes last, obviously */
IORING_OP_LAST,