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recovery: reboot recovery of delegation stateids

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recover_client_state() flags all delegations as revoked before starting open state recovery.  if recover_open() finds that its delegation is revoked, it attempts to recover it using CLAIM_PREVIOUS.  if its delegation has already been reclaimed by another open, it can skip reclaiming the open stateid (provided it has no byte-range locks to reclaim).  after all opens have been reclaimed, any delegations still marked 'revoked' are passed to recover_delegation().  recover_delegation() also uses CLAIM_PREVIOUS (or CLAIM_NULL outside of the grace period) to reclaim the delegation, but has to throw away the open stateid with CLOSE

added a try_recovery argument to nfs41_delegreturn() and nfs41_delegation_granted(), so it can be called by recover_open() if OPEN grants an unexpected open

Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
This commit is contained in:
Casey Bodley 2011-07-19 11:04:53 -04:00 • committed by unknown
parent 3734527757
commit 4f47ae9a37
7 changed files with 228 additions and 32 deletions
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daemon/nfs41.h
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@ -89,6 +89,7 @@ enum delegation_status {
typedef struct __nfs41_delegation_state {
open_delegation4 state;
nfs41_abs_path path;
nfs41_path_fh parent;
nfs41_path_fh file;
struct list_entry client_entry; /* entry in nfs41_client.delegations */
LONG ref_count;
@ -96,6 +97,8 @@ typedef struct __nfs41_delegation_state {
enum delegation_status status;
SRWLOCK lock;
CONDITION_VARIABLE cond;
bool_t revoked; /* for recovery, accessed under client.state.lock */
} nfs41_delegation_state;
typedef struct __nfs41_lock_state {