* Support for random access file reads
@ 2020-11-04 10:51 Tim Fox
2020-11-04 11:08 ` Stefan Metzmacher
0 siblings, 1 reply; 2+ messages in thread
From: Tim Fox @ 2020-11-04 10:51 UTC (permalink / raw)
To: io-uring
Hello folks,
I am new to io-uring and would like to read bytes from a specific
position in a file. I was looking for some kind of pread/preadv
functionality in io-uring but couldn't see any.
Perhaps the expectation that the file descriptor offset is explicitly
set via lseek outside of io-uring, to enable random file access use
cases like mine?
Thanks
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Support for random access file reads
2020-11-04 10:51 Support for random access file reads Tim Fox
@ 2020-11-04 11:08 ` Stefan Metzmacher
0 siblings, 0 replies; 2+ messages in thread
From: Stefan Metzmacher @ 2020-11-04 11:08 UTC (permalink / raw)
To: Tim Fox, io-uring
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Hi Tim,
> I am new to io-uring and would like to read bytes from a specific
> position in a file. I was looking for some kind of pread/preadv
> functionality in io-uring but couldn't see any.
>
> Perhaps the expectation that the file descriptor offset is explicitly
> set via lseek outside of io-uring, to enable random file access use
> cases like mine?
Look for IORING_OP_READ/IORING_OP_READV and io_uring_prep_read/io_uring_prep_readv() they
all take an offset.
metze
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