fs/nfs/delegation.h

   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                                       int (*validate_stateid)(struct nfs_delegation *delegation,
  39                                                               const nfs4_stateid *stateid));
  40 void nfs_inode_return_delegation_noreclaim(struct inode *inode);
  41
  42 struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
  43 void nfs_super_return_all_delegations(struct super_block *sb);
  44 void nfs_expire_all_delegations(struct nfs_client *clp);
  45 void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags);
  46 void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
  47 void nfs_handle_cb_pathdown(struct nfs_client *clp);
  48 int nfs_client_return_marked_delegations(struct nfs_client *clp);
  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