io_uring: allow non-fixed files with SQPOLL

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The restriction of needing fixed files for SQPOLL is problematic, and
prevents/inhibits several valid uses cases. With the referenced
files_struct that we have now, it's trivially supportable.

Treat ->files like we do the mm for the SQPOLL thread - grab a reference
to it (and assign it), and drop it when we're done.

This feature is exposed as IORING_FEAT_SQPOLL_NONFIXED.

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

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This commit is contained in:

Jens Axboe 2020-09-14 10:51:17 -06:00

parent 36f4fa6886

commit 28cea78af4

2 changed files with 70 additions and 18 deletions

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87

fs/io_uring.c

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1

include/uapi/linux/io_uring.h

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