Re: [PATCH] xfs: report a writeback error on a read() call

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On Wed, 2025-06-25 at 04:56 -0700, Christoph Hellwig wrote:
> On Wed, Jun 25, 2025 at 07:49:31AM -0400, Jeff Layton wrote:
> > Another idea: add a new generic ioctl() that checks for writeback
> > errors without syncing anything. That would be fairly simple to do and
> > sounds like it would be useful, but I'd want to hear a better
> > description of the use-case before we did anything like that.
> 
> That's what I mean with my above proposal, except that I though of an
> fcntl or syscall and not an ioctl.

Yeah, a fcntl() would be reasonable, I think.

For a syscall, I guess we could add an fsync2() which just adds a flags
field. Then add a FSYNC_JUSTCHECK flag that makes it just check for
errors and return.

Personally, I like the fcntl() idea better for this, but maybe we have
other uses for a fsync2().
-- 
Jeff Layton <jlayton@xxxxxxxxxx>





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