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deleg: return delegation before conflicting operations

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new function nfs41_delegation_return() for synchronous delegation return.  uses a condition variable to wait if another thread is already returning the delegation
if nfs41_delegate_open() would conflict with a delegation, return it before sending the OPEN
return the delegation before sending LINK, RENAME, REMOVE, and SETATTR

all of this functionality is dependent on the preprocessor define DELEGATION_RETURN_ON_CONFLICT (on by default).  if not defined, nfs41_delegation_return() is a noop

Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
This commit is contained in:
Casey Bodley 2011-07-07 13:51:21 -04:00 • committed by unknown
parent 38259e0017
commit bc6471d981
6 changed files with 179 additions and 19 deletions
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9
daemon/nfs41.h
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@ -80,13 +80,22 @@ typedef struct __nfs41_server {
LONG ref_count;
} nfs41_server;
enum delegation_status {
DELEGATION_GRANTED,
DELEGATION_RETURNING,
DELEGATION_RETURNED,
};
typedef struct __nfs41_delegation_state {
open_delegation4 state;
nfs41_abs_path path;
nfs41_path_fh file;
struct list_entry client_entry; /* entry in nfs41_client.delegations */
LONG ref_count;
enum delegation_status status;
SRWLOCK lock;
CONDITION_VARIABLE cond;
} nfs41_delegation_state;
typedef struct __nfs41_lock_state {