Re: [PATCH 0/4] FS: userspace notification of errors

[Pavel Machek <pavel@ucw.cz>]

> > > One part of the design which you didn't describe, but which I inferred
> > > is that you intend that userspace will see the FS_UNCLEAN=1 messages
> > > and will then poll all the /sys/block/<bdev>/<part>/fs_unclean files to
> > > work out which partition(s) got the error, correct?  Please spell all
> > > that out in the changelog.
> > 
> > I think this part of the design needs more thought. Not
> > all FSes have block devices (UBIFS, JFFS2), and some FSes
> > may (theoretically) span more than one block device (btrfs?).
> 
> Big thanks to everybody participating in this thread, for reviews and critiques.
> Here's a proposal/RFC for another way to implement this feature:
> 
> Taking into account Artem's and Kay's comments, indeed, having attributes
> like 'fs_error' tied to a block device does not seem right. 
> What we need is an object/entity that:
> 
> - is not associated to a block device
> - is not associated to a partition 
> - is not associated to a filesystem as a general entity
> - is uniquely associated to a filesystem's 'instance': a mounted volume
>   carying that filesystem
> - apperas at volume mount time and disappears with volume unmount

Add a ",errors " at the end of line to /proc/mounts when error is
detected? (...and make /proc/mounts pollable?)

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