io_uring: add support for IORING_SETUP_CLAMP

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Some applications like to start small in terms of ring size, and then
ramp up as needed. This is a bit tricky to do currently, since we don't
advertise the max ring size.

This adds IORING_SETUP_CLAMP. If set, and the values for SQ or CQ ring
size exceed what we support, then clamp them at the max values instead
of returning -EINVAL. Since we return the chosen ring sizes after setup,
no further changes are needed on the application side. io_uring already
changes the ring sizes if the application doesn't ask for power-of-two
sizes, for example.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

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This commit is contained in:

Jens Axboe 2019-12-28 15:39:54 -07:00

parent c6ca97b30c

commit 8110c1a621

2 changed files with 15 additions and 3 deletions

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17

fs/io_uring.c

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1

include/uapi/linux/io_uring.h

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