io_uring: allow use of offset == -1 to mean file position
This behaves like preadv2/pwritev2 with offset == -1, it'll use (and update) the current file position. This obviously comes with the caveat that if the application has multiple read/writes in flight, then the end result will not be as expected. This is similar to threads sharing a file descriptor and doing IO using the current file position. Since this feature isn't easily detectable by doing a read or write, add a feature flags, IORING_FEAT_RW_CUR_POS, to allow applications to detect presence of this feature. Reported-by:李通洲 <carter.li@eoitek.com> Signed-off-by:
Jens Axboe <axboe@kernel.dk>
parent
3a6820f2
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