Re: [PATCH] vfs: report an inode version in statx for IS_I_VERSION inodes

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On Tue, Aug 23, 2022, at 5:53 PM, Dave Chinner wrote:
> 
> THere's no definition of what consitutes an "inode change" and this
> exposes internal filesystem implementation details (i.e. on disk
> format behaviour) directly to userspace. That means when the
> internal filesystem behaviour changes, userspace applications will
> see changes in stat->ino_version changes and potentially break them.

As a userspace developer (ostree, etc. who is definitely interested in this functionality) I do agree with this concern; but a random drive by comment: would it be helpful to expose iversion (or other bits like this from the vfs) via e.g. debugfs to start?  I think that'd unblock writing fstests in the short term right?





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