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authorTrond Myklebust <Trond.Myklebust@netapp.com>2008-12-23 15:21:52 -0500
committerTrond Myklebust <Trond.Myklebust@netapp.com>2008-12-23 15:21:52 -0500
commitb7391f44f26b17ad25c7183a3d6ad50f0a9305ff (patch)
tree8e09a5714587a8bde2a805819501d10bae4787b7 /fs/nfs/delegation.h
parent6411bd4a471893ab2af103d96253ba97c92d4777 (diff)
NFSv4: Return unreferenced delegations more promptly
If the client is not using a delegation, the right thing to do is to return it as soon as possible. This helps reduce the amount of state the server has to track, as well as reducing the potential for conflicts with other clients. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/delegation.h')
-rw-r--r--fs/nfs/delegation.h17
1 files changed, 4 insertions, 13 deletions
diff --git a/fs/nfs/delegation.h b/fs/nfs/delegation.h
index 56f3eb558ef4..2a74882e5d50 100644
--- a/fs/nfs/delegation.h
+++ b/fs/nfs/delegation.h
@@ -28,6 +28,7 @@ struct nfs_delegation {
enum {
NFS_DELEGATION_NEED_RECLAIM = 0,
NFS_DELEGATION_RETURN,
+ NFS_DELEGATION_REFERENCED,
};
int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
@@ -39,6 +40,7 @@ void nfs_inode_return_delegation_noreclaim(struct inode *inode);
struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
void nfs_super_return_all_delegations(struct super_block *sb);
void nfs_expire_all_delegations(struct nfs_client *clp);
+void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
void nfs_handle_cb_pathdown(struct nfs_client *clp);
void nfs_client_return_marked_delegations(struct nfs_client *clp);
@@ -51,19 +53,8 @@ int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state
int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl);
int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
-static inline int nfs_have_delegation(struct inode *inode, int flags)
-{
- struct nfs_delegation *delegation;
- int ret = 0;
-
- flags &= FMODE_READ|FMODE_WRITE;
- rcu_read_lock();
- delegation = rcu_dereference(NFS_I(inode)->delegation);
- if (delegation != NULL && (delegation->type & flags) == flags)
- ret = 1;
- rcu_read_unlock();
- return ret;
-}
+void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
+int nfs_have_delegation(struct inode *inode, int flags);
#else
static inline int nfs_have_delegation(struct inode *inode, int flags)