Support for random access file reads

Support for random access file reads

[Tim Fox]

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

Re: Support for random access file reads

[Stefan Metzmacher]

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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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