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| author | Jens Axboe <axboe@kernel.dk> | 2022-04-14 11:22:51 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-04-14 11:22:51 -0600 |
| commit | 7cea31e742c175b8df2895b57f472b49ff514ee0 (patch) | |
| tree | 4eb7f8de9a95a3d3d104ad9aa6ff465f36c070ae | |
| parent | b418e563026380ee697c7cf9d9fbb26ea62d6cb8 (diff) | |
| download | liburing-7cea31e742c175b8df2895b57f472b49ff514ee0.tar.gz liburing-7cea31e742c175b8df2895b57f472b49ff514ee0.tar.bz2 | |
man/io_uring_setup.2: document recent FEAT flag additions
The man page was missing IORING_FEAT_CQE_SKIP and IORING_FEAT_LINKED_FILE,
add an explanation for them.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | man/io_uring_setup.2 | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/man/io_uring_setup.2 b/man/io_uring_setup.2 index c54c5da..f3911af 100644 --- a/man/io_uring_setup.2 +++ b/man/io_uring_setup.2 @@ -337,6 +337,25 @@ If this flag is set, then io_uring supports a variety of features related to fixed files and buffers. In particular, it indicates that registered buffers can be updated in-place, whereas before the full set would have to be unregistered first. Available since kernel 5.13. +.TP +.B IORING_FEAT_CQE_SKIP +If this flag is set, then io_uring supports setting +.B IOSQE_CQE_SKIP_SUCCESS +in the submitted SQE, indicating that no CQE should be generated for this +SQE if it executes normally. If an error happens processing the SQE, a +CQE with the appropriate error value will still be generated. Available since +kernel 5.17. +.TP +.B IORING_FEAT_LINKED_FILE +If this flag is set, then io_uring supports sane assignment of files for SQEs +that have dependencies. For example, if a chain of SQEs are submitted with +.B IOSQE_IO_LINK, +then kernels without this flag will prepare the file for each link upfront. +If a previous link opens a file with a known index, eg if direct descriptors +are used with open or accept, then file assignment needs to happen post +execution of that SQE. If this flag is set, then the kernel will defer +file assignment until execution of a given request is started. Available since +kernel 5.17. .PP The rest of the fields in the |