Delay state allocation until actually it is needed.

Signed-off-by: Venkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com>
Reviewed-by: Malahal Naineni <malahal@us.ibm.com>
Acked-by: Frank S. Filz <ffilzlnx@mindspring.com>
acquire_lease() -> acquire_lease_lock() to avoid confusion.
Also added appropriate comments.

Signed-off-by: Venkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com>
Reviewed-by: Malahal Naineni <malahal@us.ibm.com>
Acked-by: Frank S. Filz <ffilzlnx@mindspring.com>
Add drc_ prefix to the members of delegrecall_context struct.

Signed-off-by: Venkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com>
Reviewed-by: Malahal Naineni <malahal@us.ibm.com>
Acked-by: Frank S. Filz <ffilzlnx@mindspring.com>
Add sle_export_id to state_lock_entry_t in addition to sle_export.

The export_id is used to take a reference on export during asyc calls
ex. upcall, deleg_recall etc and compare it with sle_export.

Signed-off-by: Venkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com>
Reviewed-by: Malahal Naineni <malahal@us.ibm.com>
Acked-by: Frank S. Filz <ffilzlnx@mindspring.com>
Handle race between async-recall and remove_gsh_export()

deleg recall upcall and async recall may reace with remove_gsh_expor()
this patch is to handle those situations deligently.

Signed-off-by: Venkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com>
Reviewed-by: Malahal Naineni <malahal@us.ibm.com>
Acked-by: Frank S. Filz <ffilzlnx@mindspring.com>
Fix a typo in log message

Signed-off-by: Venkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com>
Reviewed-by: Frank S. Filz <ffilzlnx@mindspring.com>
state_export_unlock_all() mustt take the POSIX lock.

Current code assumes all locks are POSIX locks, but with the
introduction of LEASE Locks, we need to make sure that this
routine takes the first POSIX lock, not anything it finds.

Signed-off-by: Venkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com>
Reviewed-by: Frank S. Filz <ffilzlnx@mindspring.com>