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>

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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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102

fs/io_uring.c

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1

include/uapi/linux/io_uring.h

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