io_uring: cache async and regular file state for fixed files

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We have to dig quite deep to check for particularly whether or not a
file supports a fast-path nonblock attempt. For fixed files, we can do
this lookup once and cache the state instead.

This adds two new bits to track whether we support async read/write
attempt, and lines up the REQ_F_ISREG bit with those two. The file slot
re-uses the last 3 (or 2, for 32-bit) of the file pointer to cache that
state, and then we mask it in when we go and use a fixed file.

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

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Jens Axboe 2021-03-12 08:30:14 -07:00

parent d44f554e10

commit 7b29f92da3

1 changed files with 57 additions and 13 deletions

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fs/io_uring.c

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