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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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6
daemon/acl.c
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@ -24,8 +24,8 @@
#include <strsafe.h>
#include <sddl.h>
#include "nfs41.h"
#include "nfs41_ops.h"
#include "delegation.h"
#include "daemon_debug.h"
#include "util.h"
#include "upcall.h"
@ -785,6 +785,10 @@ static int handle_setacl(nfs41_upcall *upcall)
}
}
/* break read delegations before SETATTR */
nfs41_delegation_return(state->session, &state->file,
OPEN_DELEGATE_READ, FALSE);
nfs41_open_stateid_arg(state, &stateid);
status = nfs41_setattr(state->session, &state->file, &stateid, &info);
if (status) {