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Cached root file was not being completely invalidated sometimes.
Reproducing:
- With a DFS share with 2 targets, one disabled and one enabled
- start some I/O on the mount
# while true; do ls /mnt/dfs; done
- at the same time, disable the enabled target and enable the disabled
one
- wait for DFS cache to expire
- on reconnect, the previous cached root handle should be invalid, but
open_cached_dir_by_dentry() will still try to use it, but throws a
use-after-free warning (kref_get())
Make smb2_close_cached_fid() invalidate all fields every time, but only
send an SMB2_close() when the entry is still valid.
Signed-off-by: Enzo Matsumiya <ematsumiya@suse.de>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
9351590f51