Trond Myklebust 5085607d20 NFS/pnfs: Bulk destroy of layouts needs to be safe w.r.t. umount
If a bulk layout recall or a metadata server reboot coincides with a
umount, then holding a reference to an inode is unsafe unless we
also hold a reference to the super block.

Fixes: fd9a8d7160937 ("NFSv4.1: Fix bulk recall and destroy of layouts")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2019-02-23 13:59:29 -05:00
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