[PATCH][CIFS] fix reconnect with SMB1 Unix Extensions

[Steve French]

Andrew had pointed out having problems with SMB1 Unix extensions to
Samba when investigating an unrelated problem, and when I tried it I
noticed a serious reconnect issue with the SMB1 Unix Extensions.

When mounting with the SMB1 Unix Extensions (e.g. mounts
to Samba with vers=1.0), cifs.ko reconnects no longer reset the
Unix Extensions (SetFSInfo SET_FILE_UNIX_BASIC) after tcon so most
operations (e.g. stat, ls, open, statfs) will fail continuously
with:
        "Operation not supported"
if the connection ever resets (e.g. due to brief network disconnect)

Fix attached



-- 
Thanks,

Steve
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