[linux-cifs-client][patch] utilize lookup intents to open in lookup

[Shirish Pargaonkar]

Hi,

Patch to expolint lookup intents in cifs lookup during open, thus
reducing network traffick and speedier opens
Have also converted a semphore to mutex as per Jeff Layton's comments.

Trong, Al, your feedback is really appreciated.

Regards,

Shirish
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