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Linux/fs/nfs/delegation.h

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  1 /*
  2  * linux/fs/nfs/delegation.h
  3  *
  4  * Copyright (c) Trond Myklebust
  5  *
  6  * Definitions pertaining to NFS delegated files
  7  */
  8 #ifndef FS_NFS_DELEGATION_H
  9 #define FS_NFS_DELEGATION_H
 10 
 11 #if defined(CONFIG_NFS_V4)
 12 /*
 13  * NFSv4 delegation
 14  */
 15 struct nfs_delegation {
 16         struct list_head super_list;
 17         struct rpc_cred *cred;
 18         struct inode *inode;
 19         nfs4_stateid stateid;
 20         fmode_t type;
 21         loff_t maxsize;
 22         __u64 change_attr;
 23         unsigned long flags;
 24         spinlock_t lock;
 25         struct rcu_head rcu;
 26 };
 27 
 28 enum {
 29         NFS_DELEGATION_NEED_RECLAIM = 0,
 30         NFS_DELEGATION_RETURN,
 31         NFS_DELEGATION_REFERENCED,
 32 };
 33 
 34 int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
 35 void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
 36 int nfs_inode_return_delegation(struct inode *inode);
 37 int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
 38 void nfs_inode_return_delegation_noreclaim(struct inode *inode);
 39 
 40 struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
 41 void nfs_super_return_all_delegations(struct super_block *sb);
 42 void nfs_expire_all_delegations(struct nfs_client *clp);
 43 void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags);
 44 void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
 45 void nfs_handle_cb_pathdown(struct nfs_client *clp);
 46 int nfs_client_return_marked_delegations(struct nfs_client *clp);
 47 int nfs_delegations_present(struct nfs_client *clp);
 48 void nfs_remove_bad_delegation(struct inode *inode);
 49 
 50 void nfs_delegation_mark_reclaim(struct nfs_client *clp);
 51 void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
 52 
 53 /* NFSv4 delegation-related procedures */
 54 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync);
 55 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid);
 56 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl);
 57 int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
 58 
 59 void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
 60 int nfs_have_delegation(struct inode *inode, fmode_t flags);
 61 
 62 #else
 63 static inline int nfs_have_delegation(struct inode *inode, fmode_t flags)
 64 {
 65         return 0;
 66 }
 67 
 68 static inline int nfs_inode_return_delegation(struct inode *inode)
 69 {
 70         return 0;
 71 }
 72 #endif
 73 
 74 static inline int nfs_have_delegated_attributes(struct inode *inode)
 75 {
 76         return nfs_have_delegation(inode, FMODE_READ) &&
 77                 !(NFS_I(inode)->cache_validity & NFS_INO_REVAL_FORCED);
 78 }
 79 
 80 #endif
 81 

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