On 8/31/21 9:04 PM, Jens Axboe wrote: > On 8/31/21 1:52 PM, Pavel Begunkov wrote: >> Add a few lines describing openat/openat2/accept bypassing normal file >> tables and installing files right into the fixed file table. >> >> Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx> >> --- >> man/io_uring_enter.2 | 36 ++++++++++++++++++++++++++++++++++++ >> 1 file changed, 36 insertions(+) >> >> diff --git a/man/io_uring_enter.2 b/man/io_uring_enter.2 >> index 9ccedef..52a5e13 100644 >> --- a/man/io_uring_enter.2 >> +++ b/man/io_uring_enter.2 >> @@ -511,6 +511,18 @@ field. See also >> .BR accept4(2) >> for the general description of the related system call. Available since 5.5. >> >> +If the >> +.I file_index >> +field is set to a non-negative number, the file won't be installed into the >> +normal file table as usual but will be placed into the fixed file table at index >> +.I file_index - 1. >> +In this case, instead of returning a file descriptor, the result will contain >> +0 on success or an error. If there is already a file registered at this index, > > I don't think non-negative is correct, it has to be set to a positive > number. non-negative would include 0, which isn't correct. Oh, right, should have been non-zero > Should also include a note on if these types of file are used, they > won't work in anything but io_uring. That's obvious to us, but should be > noted that they then only live within the realm of the ring itself, not > the system as a whole. Will send a v2 -- Pavel Begunkov
