Re: [PATCH 1/2] fs: add a FMODE_ flag to indicate IOCB_HAS_METADATA availability

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On Tue, Aug 19, 2025 at 11:22:19AM +0200, Christoph Hellwig wrote:
> On Tue, Aug 19, 2025 at 11:14:41AM +0200, Christian Brauner wrote:
> > It kind of feels like that f_iocb_flags should be changed so that
> > subsystems like block can just raise some internal flags directly
> > instead of grabbing a f_mode flag everytime they need to make some
> > IOCB_* flag conditional on the file. That would mean changing the
> > unconditional assigment to file->f_iocb_flags to a |= to not mask flags
> > raised by the kernel itself.
> 
> This isn't about block.  I will be setting this for a file system
> operation as well and use the same io_uring code for that.  That's
> how I ran into the issue.

Yes, I get that. That's not what this is about. If IOCB_* flags keep
getting added that then need an additional opt-out via an FMODE_* flag
it's very annoying because you keep taking FMODE_* bits. The thing is
that it should be possible to keep that information completely contained
to f_iocb_flags without polluting f_mode.




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