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man/io_uring_setup.2: document recent FEAT flag additions

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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>
This commit is contained in:
Jens Axboe
2022-04-14 11:22:51 -06:00
parent 1df4c75155
commit 83bfc0c6b6
1 changed files with 19 additions and 0 deletions
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man/io_uring_setup.2
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@@ -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