aboutsummaryrefslogblamecommitdiffstats
path: root/fs/nfs/delegation.h
blob: d9322e490c56ff98a39e79295186653e0e80589e (plain) (tree)


















                                                
                     
                       
                          
                            
                        
                            

  


                                        
                                  

  

                                                                                                       
                                                     
                                                                                        
                                                                
 
                                                                                              
                                                              
                                                        
                                                                            
                                                                 
                                                    
                                                                 
                                                    
 

                                                           

                                         
                                                                                                               
                                                                                                                     
                                                                                
                                                                         
 
                                                                       
                                                            
 
     
                                                                         


                 




                                                                  

      





                                                                       
      
/*
 * linux/fs/nfs/delegation.h
 *
 * Copyright (c) Trond Myklebust
 *
 * Definitions pertaining to NFS delegated files
 */
#ifndef FS_NFS_DELEGATION_H
#define FS_NFS_DELEGATION_H

#if defined(CONFIG_NFS_V4)
/*
 * NFSv4 delegation
 */
struct nfs_delegation {
	struct list_head super_list;
	struct rpc_cred *cred;
	struct inode *inode;
	nfs4_stateid stateid;
	fmode_t type;
	loff_t maxsize;
	__u64 change_attr;
	unsigned long flags;
	spinlock_t lock;
	struct rcu_head rcu;
};

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);
void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
int nfs_inode_return_delegation(struct inode *inode);
int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
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_all_delegation_types(struct nfs_client *clp, fmode_t flags);
void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
void nfs_handle_cb_pathdown(struct nfs_client *clp);
int nfs_client_return_marked_delegations(struct nfs_client *clp);
int nfs_delegations_present(struct nfs_client *clp);

void nfs_delegation_mark_reclaim(struct nfs_client *clp);
void nfs_delegation_reap_unclaimed(struct nfs_client *clp);

/* NFSv4 delegation-related procedures */
int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync);
int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid);
int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl);
int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode);

void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
int nfs_have_delegation(struct inode *inode, fmode_t flags);

#else
static inline int nfs_have_delegation(struct inode *inode, fmode_t flags)
{
	return 0;
}

static inline int nfs_inode_return_delegation(struct inode *inode)
{
	return 0;
}
#endif

static inline int nfs_have_delegated_attributes(struct inode *inode)
{
	return nfs_have_delegation(inode, FMODE_READ) &&
		!(NFS_I(inode)->cache_validity & NFS_INO_REVAL_FORCED);
}

#endif