[RFC] alter inode table lock from mutex to rwlock

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Hi,

Now inode_table_t:lock is type of mutex which I think we can use ‘pthread_rwlock' to replace it for a better concurrency.

Because phread_rwlock allows more than one thread accessing inode table at the same time. Moreover, the critical section the lock is protecting won't take many CPU cycles and no I/O and CPU fault/exception involved after a quick glance at glusterfs code.
I hope I didn't miss something.
If I would get an ACK from major glusterfs developer, I will try to do it.

Thanks.
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