Shyam Prasad N [off-list ref] writes:

Going by the documentation of d_revalidate:

quoted

This function should return a positive value if the dentry is still
valid, and zero or a negative error code if it isn't.

In case of error, can we try returning the rc itself (rather than 0),
and see if VFS avoids a dentry put?
Because theoretically, the call execution has failed, and the dentry
is not found to be invalid.

AFAIK mount points are pinned, you cannot rm or mv them so it seems we
could make them always valid. I don't know if there are deeper and more
subtle implications.

The recent signal fixes are not fixing this issue.

Cheers,
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Aurélien Aptel / SUSE Labs Samba Team
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