io_uring: use iov_iter state save/restore helpers

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Get rid of the need to do re-expand and revert on an iterator when we
encounter a short IO, or failure that warrants a retry. Use the new
state save/restore helpers instead.

We keep the iov_iter_state persistent across retries, if we need to
restart the read or write operation. If there's a pending retry, the
operation will always exit with the state correctly saved.

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

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Jens Axboe 2021-09-10 11:19:14 -06:00

parent 8fb0f47a9d

commit cd65869512

1 changed files with 61 additions and 21 deletions

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fs/io_uring.c

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