tree 047598958f44c9865039f19b8f3d4abfc4b99065
parent c0e6bee480591a78caad5b13bd377948c025d0cd
author J. Bruce Fields <bfields@redhat.com> 1390604680 -0500
committer J. Bruce Fields <bfields@redhat.com> 1390849156 -0500

nfsd4: fix delegation-unlink/rename race

If a file is unlinked or renamed between the time when we do the local
open and the time when we get the delegation, then we will return to the
client indicating that it holds a delegation even though the file no
longer exists under the name it was open under.

But a client performing an open-by-name, when it is returned a
delegation, must be able to assume that the file is still linked at the
name it was opened under.

So, hold the parent i_mutex for longer to prevent concurrent renames or
unlinks.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>